Gitiles
Code Review Sign In
gerrit-public.fairphone.software / fp2-dev / kernel / msm / 6f84be84b4cde72fa2a2f0d10ac284a31e923200 / . / drivers / char / synclink_gt.c
blob: 4e35d41812248e7163c6bcbda1ee7f180dec1283 [file] [log] [blame]
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]1/*
Paul Fulghum0080b7a2006-03-28 01:56:15 -0800[diff] [blame]2 * $Id: synclink_gt.c,v 4.25 2006/02/06 21:20:33 paulkf Exp $
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]3 *
4 * Device driver for Microgate SyncLink GT serial adapters.
5 *
6 * written by Paul Fulghum for Microgate Corporation
7 * paulkf@microgate.com
8 *
9 * Microgate and SyncLink are trademarks of Microgate Corporation
10 *
11 * This code is released under the GNU General Public License (GPL)
12 *
13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
14 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
16 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
17 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
19 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
21 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
23 * OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26/*
27 * DEBUG OUTPUT DEFINITIONS
28 *
29 * uncomment lines below to enable specific types of debug output
30 *
31 * DBGINFO information - most verbose output
32 * DBGERR serious errors
33 * DBGBH bottom half service routine debugging
34 * DBGISR interrupt service routine debugging
35 * DBGDATA output receive and transmit data
36 * DBGTBUF output transmit DMA buffers and registers
37 * DBGRBUF output receive DMA buffers and registers
38 */
39
40#define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt
41#define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt
42#define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt
43#define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt
44#define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label))
45//#define DBGTBUF(info) dump_tbufs(info)
46//#define DBGRBUF(info) dump_rbufs(info)
47
48
49#include <linux/config.h>
50#include <linux/module.h>
51#include <linux/version.h>
52#include <linux/errno.h>
53#include <linux/signal.h>
54#include <linux/sched.h>
55#include <linux/timer.h>
56#include <linux/interrupt.h>
57#include <linux/pci.h>
58#include <linux/tty.h>
59#include <linux/tty_flip.h>
60#include <linux/serial.h>
61#include <linux/major.h>
62#include <linux/string.h>
63#include <linux/fcntl.h>
64#include <linux/ptrace.h>
65#include <linux/ioport.h>
66#include <linux/mm.h>
67#include <linux/slab.h>
68#include <linux/netdevice.h>
69#include <linux/vmalloc.h>
70#include <linux/init.h>
71#include <linux/delay.h>
72#include <linux/ioctl.h>
73#include <linux/termios.h>
74#include <linux/bitops.h>
75#include <linux/workqueue.h>
76#include <linux/hdlc.h>
77
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]78#include <asm/system.h>
79#include <asm/io.h>
80#include <asm/irq.h>
81#include <asm/dma.h>
82#include <asm/types.h>
83#include <asm/uaccess.h>
84
85#include "linux/synclink.h"
86
87#ifdef CONFIG_HDLC_MODULE
88#define CONFIG_HDLC 1
89#endif
90
91/*
92 * module identification
93 */
94static char *driver_name = "SyncLink GT";
Paul Fulghum0080b7a2006-03-28 01:56:15 -0800[diff] [blame]95static char *driver_version = "$Revision: 4.25 $";
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]96static char *tty_driver_name = "synclink_gt";
97static char *tty_dev_prefix = "ttySLG";
98MODULE_LICENSE("GPL");
99#define MGSL_MAGIC 0x5401
100#define MAX_DEVICES 12
101
102static struct pci_device_id pci_table[] = {
103 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
Paul Fulghum6f84be82006-06-25 05:49:22 -0700[diff] [blame^]104 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]105 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
106 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
107 {0,}, /* terminate list */
108};
109MODULE_DEVICE_TABLE(pci, pci_table);
110
111static int init_one(struct pci_dev *dev,const struct pci_device_id *ent);
112static void remove_one(struct pci_dev *dev);
113static struct pci_driver pci_driver = {
114 .name = "synclink_gt",
115 .id_table = pci_table,
116 .probe = init_one,
117 .remove = __devexit_p(remove_one),
118};
119
120static int pci_registered;
121
122/*
123 * module configuration and status
124 */
125static struct slgt_info *slgt_device_list;
126static int slgt_device_count;
127
128static int ttymajor;
129static int debug_level;
130static int maxframe[MAX_DEVICES];
131static int dosyncppp[MAX_DEVICES];
132
133module_param(ttymajor, int, 0);
134module_param(debug_level, int, 0);
135module_param_array(maxframe, int, NULL, 0);
136module_param_array(dosyncppp, int, NULL, 0);
137
138MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
139MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
140MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
141MODULE_PARM_DESC(dosyncppp, "Enable synchronous net device, 0=disable 1=enable");
142
143/*
144 * tty support and callbacks
145 */
146#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
147
148static struct tty_driver *serial_driver;
149
150static int open(struct tty_struct *tty, struct file * filp);
151static void close(struct tty_struct *tty, struct file * filp);
152static void hangup(struct tty_struct *tty);
153static void set_termios(struct tty_struct *tty, struct termios *old_termios);
154
155static int write(struct tty_struct *tty, const unsigned char *buf, int count);
156static void put_char(struct tty_struct *tty, unsigned char ch);
157static void send_xchar(struct tty_struct *tty, char ch);
158static void wait_until_sent(struct tty_struct *tty, int timeout);
159static int write_room(struct tty_struct *tty);
160static void flush_chars(struct tty_struct *tty);
161static void flush_buffer(struct tty_struct *tty);
162static void tx_hold(struct tty_struct *tty);
163static void tx_release(struct tty_struct *tty);
164
165static int ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
166static int read_proc(char *page, char **start, off_t off, int count,int *eof, void *data);
167static int chars_in_buffer(struct tty_struct *tty);
168static void throttle(struct tty_struct * tty);
169static void unthrottle(struct tty_struct * tty);
170static void set_break(struct tty_struct *tty, int break_state);
171
172/*
173 * generic HDLC support and callbacks
174 */
175#ifdef CONFIG_HDLC
176#define dev_to_port(D) (dev_to_hdlc(D)->priv)
177static void hdlcdev_tx_done(struct slgt_info *info);
178static void hdlcdev_rx(struct slgt_info *info, char *buf, int size);
179static int hdlcdev_init(struct slgt_info *info);
180static void hdlcdev_exit(struct slgt_info *info);
181#endif
182
183
184/*
185 * device specific structures, macros and functions
186 */
187
188#define SLGT_MAX_PORTS 4
189#define SLGT_REG_SIZE 256
190
191/*
Paul Fulghum0080b7a2006-03-28 01:56:15 -0800[diff] [blame]192 * conditional wait facility
193 */
194struct cond_wait {
195 struct cond_wait *next;
196 wait_queue_head_t q;
197 wait_queue_t wait;
198 unsigned int data;
199};
200static void init_cond_wait(struct cond_wait *w, unsigned int data);
201static void add_cond_wait(struct cond_wait **head, struct cond_wait *w);
202static void remove_cond_wait(struct cond_wait **head, struct cond_wait *w);
203static void flush_cond_wait(struct cond_wait **head);
204
205/*
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]206 * DMA buffer descriptor and access macros
207 */
208struct slgt_desc
209{
210 unsigned short count;
211 unsigned short status;
212 unsigned int pbuf; /* physical address of data buffer */
213 unsigned int next; /* physical address of next descriptor */
214
215 /* driver book keeping */
216 char *buf; /* virtual address of data buffer */
217 unsigned int pdesc; /* physical address of this descriptor */
218 dma_addr_t buf_dma_addr;
219};
220
221#define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b))
222#define set_desc_next(a,b) (a).next = cpu_to_le32((unsigned int)(b))
223#define set_desc_count(a,b)(a).count = cpu_to_le16((unsigned short)(b))
224#define set_desc_eof(a,b) (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0))
225#define desc_count(a) (le16_to_cpu((a).count))
226#define desc_status(a) (le16_to_cpu((a).status))
227#define desc_complete(a) (le16_to_cpu((a).status) & BIT15)
228#define desc_eof(a) (le16_to_cpu((a).status) & BIT2)
229#define desc_crc_error(a) (le16_to_cpu((a).status) & BIT1)
230#define desc_abort(a) (le16_to_cpu((a).status) & BIT0)
231#define desc_residue(a) ((le16_to_cpu((a).status) & 0x38) >> 3)
232
233struct _input_signal_events {
234 int ri_up;
235 int ri_down;
236 int dsr_up;
237 int dsr_down;
238 int dcd_up;
239 int dcd_down;
240 int cts_up;
241 int cts_down;
242};
243
244/*
245 * device instance data structure
246 */
247struct slgt_info {
248 void *if_ptr; /* General purpose pointer (used by SPPP) */
249
250 struct slgt_info *next_device; /* device list link */
251
252 int magic;
253 int flags;
254
255 char device_name[25];
256 struct pci_dev *pdev;
257
258 int port_count; /* count of ports on adapter */
259 int adapter_num; /* adapter instance number */
260 int port_num; /* port instance number */
261
262 /* array of pointers to port contexts on this adapter */
263 struct slgt_info *port_array[SLGT_MAX_PORTS];
264
265 int count; /* count of opens */
266 int line; /* tty line instance number */
267 unsigned short close_delay;
268 unsigned short closing_wait; /* time to wait before closing */
269
270 struct mgsl_icount icount;
271
272 struct tty_struct *tty;
273 int timeout;
274 int x_char; /* xon/xoff character */
275 int blocked_open; /* # of blocked opens */
276 unsigned int read_status_mask;
277 unsigned int ignore_status_mask;
278
279 wait_queue_head_t open_wait;
280 wait_queue_head_t close_wait;
281
282 wait_queue_head_t status_event_wait_q;
283 wait_queue_head_t event_wait_q;
284 struct timer_list tx_timer;
285 struct timer_list rx_timer;
286
Paul Fulghum0080b7a2006-03-28 01:56:15 -0800[diff] [blame]287 unsigned int gpio_present;
288 struct cond_wait *gpio_wait_q;
289
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]290 spinlock_t lock; /* spinlock for synchronizing with ISR */
291
292 struct work_struct task;
293 u32 pending_bh;
294 int bh_requested;
295 int bh_running;
296
297 int isr_overflow;
298 int irq_requested; /* nonzero if IRQ requested */
299 int irq_occurred; /* for diagnostics use */
300
301 /* device configuration */
302
303 unsigned int bus_type;
304 unsigned int irq_level;
305 unsigned long irq_flags;
306
307 unsigned char __iomem * reg_addr; /* memory mapped registers address */
308 u32 phys_reg_addr;
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]309 int reg_addr_requested;
310
311 MGSL_PARAMS params; /* communications parameters */
312 u32 idle_mode;
313 u32 max_frame_size; /* as set by device config */
314
315 unsigned int raw_rx_size;
316 unsigned int if_mode;
317
318 /* device status */
319
320 int rx_enabled;
321 int rx_restart;
322
323 int tx_enabled;
324 int tx_active;
325
326 unsigned char signals; /* serial signal states */
Darren Jenkins2641dfd2006-02-28 16:59:20 -0800[diff] [blame]327 int init_error; /* initialization error */
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]328
329 unsigned char *tx_buf;
330 int tx_count;
331
332 char flag_buf[MAX_ASYNC_BUFFER_SIZE];
333 char char_buf[MAX_ASYNC_BUFFER_SIZE];
334 BOOLEAN drop_rts_on_tx_done;
335 struct _input_signal_events input_signal_events;
336
337 int dcd_chkcount; /* check counts to prevent */
338 int cts_chkcount; /* too many IRQs if a signal */
339 int dsr_chkcount; /* is floating */
340 int ri_chkcount;
341
342 char *bufs; /* virtual address of DMA buffer lists */
343 dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */
344
345 unsigned int rbuf_count;
346 struct slgt_desc *rbufs;
347 unsigned int rbuf_current;
348 unsigned int rbuf_index;
349
350 unsigned int tbuf_count;
351 struct slgt_desc *tbufs;
352 unsigned int tbuf_current;
353 unsigned int tbuf_start;
354
355 unsigned char *tmp_rbuf;
356 unsigned int tmp_rbuf_count;
357
358 /* SPPP/Cisco HDLC device parts */
359
360 int netcount;
361 int dosyncppp;
362 spinlock_t netlock;
363#ifdef CONFIG_HDLC
364 struct net_device *netdev;
365#endif
366
367};
368
369static MGSL_PARAMS default_params = {
370 .mode = MGSL_MODE_HDLC,
371 .loopback = 0,
372 .flags = HDLC_FLAG_UNDERRUN_ABORT15,
373 .encoding = HDLC_ENCODING_NRZI_SPACE,
374 .clock_speed = 0,
375 .addr_filter = 0xff,
376 .crc_type = HDLC_CRC_16_CCITT,
377 .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS,
378 .preamble = HDLC_PREAMBLE_PATTERN_NONE,
379 .data_rate = 9600,
380 .data_bits = 8,
381 .stop_bits = 1,
382 .parity = ASYNC_PARITY_NONE
383};
384
385
386#define BH_RECEIVE 1
387#define BH_TRANSMIT 2
388#define BH_STATUS 4
389#define IO_PIN_SHUTDOWN_LIMIT 100
390
391#define DMABUFSIZE 256
392#define DESC_LIST_SIZE 4096
393
394#define MASK_PARITY BIT1
395#define MASK_FRAMING BIT2
396#define MASK_BREAK BIT3
397#define MASK_OVERRUN BIT4
398
399#define GSR 0x00 /* global status */
Paul Fulghum0080b7a2006-03-28 01:56:15 -0800[diff] [blame]400#define JCR 0x04 /* JTAG control */
401#define IODR 0x08 /* GPIO direction */
402#define IOER 0x0c /* GPIO interrupt enable */
403#define IOVR 0x10 /* GPIO value */
404#define IOSR 0x14 /* GPIO interrupt status */
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]405#define TDR 0x80 /* tx data */
406#define RDR 0x80 /* rx data */
407#define TCR 0x82 /* tx control */
408#define TIR 0x84 /* tx idle */
409#define TPR 0x85 /* tx preamble */
410#define RCR 0x86 /* rx control */
411#define VCR 0x88 /* V.24 control */
412#define CCR 0x89 /* clock control */
413#define BDR 0x8a /* baud divisor */
414#define SCR 0x8c /* serial control */
415#define SSR 0x8e /* serial status */
416#define RDCSR 0x90 /* rx DMA control/status */
417#define TDCSR 0x94 /* tx DMA control/status */
418#define RDDAR 0x98 /* rx DMA descriptor address */
419#define TDDAR 0x9c /* tx DMA descriptor address */
420
421#define RXIDLE BIT14
422#define RXBREAK BIT14
423#define IRQ_TXDATA BIT13
424#define IRQ_TXIDLE BIT12
425#define IRQ_TXUNDER BIT11 /* HDLC */
426#define IRQ_RXDATA BIT10
427#define IRQ_RXIDLE BIT9 /* HDLC */
428#define IRQ_RXBREAK BIT9 /* async */
429#define IRQ_RXOVER BIT8
430#define IRQ_DSR BIT7
431#define IRQ_CTS BIT6
432#define IRQ_DCD BIT5
433#define IRQ_RI BIT4
434#define IRQ_ALL 0x3ff0
435#define IRQ_MASTER BIT0
436
437#define slgt_irq_on(info, mask) \
438 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask)))
439#define slgt_irq_off(info, mask) \
440 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask)))
441
442static __u8 rd_reg8(struct slgt_info *info, unsigned int addr);
443static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value);
444static __u16 rd_reg16(struct slgt_info *info, unsigned int addr);
445static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value);
446static __u32 rd_reg32(struct slgt_info *info, unsigned int addr);
447static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value);
448
449static void msc_set_vcr(struct slgt_info *info);
450
451static int startup(struct slgt_info *info);
452static int block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
453static void shutdown(struct slgt_info *info);
454static void program_hw(struct slgt_info *info);
455static void change_params(struct slgt_info *info);
456
457static int register_test(struct slgt_info *info);
458static int irq_test(struct slgt_info *info);
459static int loopback_test(struct slgt_info *info);
460static int adapter_test(struct slgt_info *info);
461
462static void reset_adapter(struct slgt_info *info);
463static void reset_port(struct slgt_info *info);
464static void async_mode(struct slgt_info *info);
465static void hdlc_mode(struct slgt_info *info);
466
467static void rx_stop(struct slgt_info *info);
468static void rx_start(struct slgt_info *info);
469static void reset_rbufs(struct slgt_info *info);
470static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last);
471static void rdma_reset(struct slgt_info *info);
472static int rx_get_frame(struct slgt_info *info);
473static int rx_get_buf(struct slgt_info *info);
474
475static void tx_start(struct slgt_info *info);
476static void tx_stop(struct slgt_info *info);
477static void tx_set_idle(struct slgt_info *info);
478static unsigned int free_tbuf_count(struct slgt_info *info);
479static void reset_tbufs(struct slgt_info *info);
480static void tdma_reset(struct slgt_info *info);
481static void tx_load(struct slgt_info *info, const char *buf, unsigned int count);
482
483static void get_signals(struct slgt_info *info);
484static void set_signals(struct slgt_info *info);
485static void enable_loopback(struct slgt_info *info);
486static void set_rate(struct slgt_info *info, u32 data_rate);
487
488static int bh_action(struct slgt_info *info);
489static void bh_handler(void* context);
490static void bh_transmit(struct slgt_info *info);
491static void isr_serial(struct slgt_info *info);
492static void isr_rdma(struct slgt_info *info);
493static void isr_txeom(struct slgt_info *info, unsigned short status);
494static void isr_tdma(struct slgt_info *info);
495static irqreturn_t slgt_interrupt(int irq, void *dev_id, struct pt_regs * regs);
496
497static int alloc_dma_bufs(struct slgt_info *info);
498static void free_dma_bufs(struct slgt_info *info);
499static int alloc_desc(struct slgt_info *info);
500static void free_desc(struct slgt_info *info);
501static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
502static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
503
504static int alloc_tmp_rbuf(struct slgt_info *info);
505static void free_tmp_rbuf(struct slgt_info *info);
506
507static void tx_timeout(unsigned long context);
508static void rx_timeout(unsigned long context);
509
510/*
511 * ioctl handlers
512 */
513static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount);
514static int get_params(struct slgt_info *info, MGSL_PARAMS __user *params);
515static int set_params(struct slgt_info *info, MGSL_PARAMS __user *params);
516static int get_txidle(struct slgt_info *info, int __user *idle_mode);
517static int set_txidle(struct slgt_info *info, int idle_mode);
518static int tx_enable(struct slgt_info *info, int enable);
519static int tx_abort(struct slgt_info *info);
520static int rx_enable(struct slgt_info *info, int enable);
521static int modem_input_wait(struct slgt_info *info,int arg);
522static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
523static int tiocmget(struct tty_struct *tty, struct file *file);
524static int tiocmset(struct tty_struct *tty, struct file *file,
525 unsigned int set, unsigned int clear);
526static void set_break(struct tty_struct *tty, int break_state);
527static int get_interface(struct slgt_info *info, int __user *if_mode);
528static int set_interface(struct slgt_info *info, int if_mode);
Paul Fulghum0080b7a2006-03-28 01:56:15 -0800[diff] [blame]529static int set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
530static int get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
531static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]532
533/*
534 * driver functions
535 */
536static void add_device(struct slgt_info *info);
537static void device_init(int adapter_num, struct pci_dev *pdev);
538static int claim_resources(struct slgt_info *info);
539static void release_resources(struct slgt_info *info);
540
541/*
542 * DEBUG OUTPUT CODE
543 */
544#ifndef DBGINFO
545#define DBGINFO(fmt)
546#endif
547#ifndef DBGERR
548#define DBGERR(fmt)
549#endif
550#ifndef DBGBH
551#define DBGBH(fmt)
552#endif
553#ifndef DBGISR
554#define DBGISR(fmt)
555#endif
556
557#ifdef DBGDATA
558static void trace_block(struct slgt_info *info, const char *data, int count, const char *label)
559{
560 int i;
561 int linecount;
562 printk("%s %s data:\n",info->device_name, label);
563 while(count) {
564 linecount = (count > 16) ? 16 : count;
565 for(i=0; i < linecount; i++)
566 printk("%02X ",(unsigned char)data[i]);
567 for(;i<17;i++)
568 printk(" ");
569 for(i=0;i<linecount;i++) {
570 if (data[i]>=040 && data[i]<=0176)
571 printk("%c",data[i]);
572 else
573 printk(".");
574 }
575 printk("\n");
576 data += linecount;
577 count -= linecount;
578 }
579}
580#else
581#define DBGDATA(info, buf, size, label)
582#endif
583
584#ifdef DBGTBUF
585static void dump_tbufs(struct slgt_info *info)
586{
587 int i;
588 printk("tbuf_current=%d\n", info->tbuf_current);
589 for (i=0 ; i < info->tbuf_count ; i++) {
590 printk("%d: count=%04X status=%04X\n",
591 i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status));
592 }
593}
594#else
595#define DBGTBUF(info)
596#endif
597
598#ifdef DBGRBUF
599static void dump_rbufs(struct slgt_info *info)
600{
601 int i;
602 printk("rbuf_current=%d\n", info->rbuf_current);
603 for (i=0 ; i < info->rbuf_count ; i++) {
604 printk("%d: count=%04X status=%04X\n",
605 i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status));
606 }
607}
608#else
609#define DBGRBUF(info)
610#endif
611
612static inline int sanity_check(struct slgt_info *info, char *devname, const char *name)
613{
614#ifdef SANITY_CHECK
615 if (!info) {
616 printk("null struct slgt_info for (%s) in %s\n", devname, name);
617 return 1;
618 }
619 if (info->magic != MGSL_MAGIC) {
620 printk("bad magic number struct slgt_info (%s) in %s\n", devname, name);
621 return 1;
622 }
623#else
624 if (!info)
625 return 1;
626#endif
627 return 0;
628}
629
630/**
631 * line discipline callback wrappers
632 *
633 * The wrappers maintain line discipline references
634 * while calling into the line discipline.
635 *
636 * ldisc_receive_buf - pass receive data to line discipline
637 */
638static void ldisc_receive_buf(struct tty_struct *tty,
639 const __u8 *data, char *flags, int count)
640{
641 struct tty_ldisc *ld;
642 if (!tty)
643 return;
644 ld = tty_ldisc_ref(tty);
645 if (ld) {
646 if (ld->receive_buf)
647 ld->receive_buf(tty, data, flags, count);
648 tty_ldisc_deref(ld);
649 }
650}
651
652/* tty callbacks */
653
654static int open(struct tty_struct *tty, struct file *filp)
655{
656 struct slgt_info *info;
657 int retval, line;
658 unsigned long flags;
659
660 line = tty->index;
661 if ((line < 0) || (line >= slgt_device_count)) {
662 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line));
663 return -ENODEV;
664 }
665
666 info = slgt_device_list;
667 while(info && info->line != line)
668 info = info->next_device;
669 if (sanity_check(info, tty->name, "open"))
670 return -ENODEV;
671 if (info->init_error) {
672 DBGERR(("%s init error=%d\n", info->device_name, info->init_error));
673 return -ENODEV;
674 }
675
676 tty->driver_data = info;
677 info->tty = tty;
678
679 DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->count));
680
681 /* If port is closing, signal caller to try again */
682 if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){
683 if (info->flags & ASYNC_CLOSING)
684 interruptible_sleep_on(&info->close_wait);
685 retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
686 -EAGAIN : -ERESTARTSYS);
687 goto cleanup;
688 }
689
690 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
691
692 spin_lock_irqsave(&info->netlock, flags);
693 if (info->netcount) {
694 retval = -EBUSY;
695 spin_unlock_irqrestore(&info->netlock, flags);
696 goto cleanup;
697 }
698 info->count++;
699 spin_unlock_irqrestore(&info->netlock, flags);
700
701 if (info->count == 1) {
702 /* 1st open on this device, init hardware */
703 retval = startup(info);
704 if (retval < 0)
705 goto cleanup;
706 }
707
708 retval = block_til_ready(tty, filp, info);
709 if (retval) {
710 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
711 goto cleanup;
712 }
713
714 retval = 0;
715
716cleanup:
717 if (retval) {
718 if (tty->count == 1)
719 info->tty = NULL; /* tty layer will release tty struct */
720 if(info->count)
721 info->count--;
722 }
723
724 DBGINFO(("%s open rc=%d\n", info->device_name, retval));
725 return retval;
726}
727
728static void close(struct tty_struct *tty, struct file *filp)
729{
730 struct slgt_info *info = tty->driver_data;
731
732 if (sanity_check(info, tty->name, "close"))
733 return;
734 DBGINFO(("%s close entry, count=%d\n", info->device_name, info->count));
735
736 if (!info->count)
737 return;
738
739 if (tty_hung_up_p(filp))
740 goto cleanup;
741
742 if ((tty->count == 1) && (info->count != 1)) {
743 /*
744 * tty->count is 1 and the tty structure will be freed.
745 * info->count should be one in this case.
746 * if it's not, correct it so that the port is shutdown.
747 */
748 DBGERR(("%s close: bad refcount; tty->count=1, "
749 "info->count=%d\n", info->device_name, info->count));
750 info->count = 1;
751 }
752
753 info->count--;
754
755 /* if at least one open remaining, leave hardware active */
756 if (info->count)
757 goto cleanup;
758
759 info->flags |= ASYNC_CLOSING;
760
761 /* set tty->closing to notify line discipline to
762 * only process XON/XOFF characters. Only the N_TTY
763 * discipline appears to use this (ppp does not).
764 */
765 tty->closing = 1;
766
767 /* wait for transmit data to clear all layers */
768
769 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
770 DBGINFO(("%s call tty_wait_until_sent\n", info->device_name));
771 tty_wait_until_sent(tty, info->closing_wait);
772 }
773
774 if (info->flags & ASYNC_INITIALIZED)
775 wait_until_sent(tty, info->timeout);
776 if (tty->driver->flush_buffer)
777 tty->driver->flush_buffer(tty);
778 tty_ldisc_flush(tty);
779
780 shutdown(info);
781
782 tty->closing = 0;
783 info->tty = NULL;
784
785 if (info->blocked_open) {
786 if (info->close_delay) {
787 msleep_interruptible(jiffies_to_msecs(info->close_delay));
788 }
789 wake_up_interruptible(&info->open_wait);
790 }
791
792 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
793
794 wake_up_interruptible(&info->close_wait);
795
796cleanup:
797 DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->count));
798}
799
800static void hangup(struct tty_struct *tty)
801{
802 struct slgt_info *info = tty->driver_data;
803
804 if (sanity_check(info, tty->name, "hangup"))
805 return;
806 DBGINFO(("%s hangup\n", info->device_name));
807
808 flush_buffer(tty);
809 shutdown(info);
810
811 info->count = 0;
812 info->flags &= ~ASYNC_NORMAL_ACTIVE;
813 info->tty = NULL;
814
815 wake_up_interruptible(&info->open_wait);
816}
817
818static void set_termios(struct tty_struct *tty, struct termios *old_termios)
819{
820 struct slgt_info *info = tty->driver_data;
821 unsigned long flags;
822
823 DBGINFO(("%s set_termios\n", tty->driver->name));
824
825 /* just return if nothing has changed */
826 if ((tty->termios->c_cflag == old_termios->c_cflag)
827 && (RELEVANT_IFLAG(tty->termios->c_iflag)
828 == RELEVANT_IFLAG(old_termios->c_iflag)))
829 return;
830
831 change_params(info);
832
833 /* Handle transition to B0 status */
834 if (old_termios->c_cflag & CBAUD &&
835 !(tty->termios->c_cflag & CBAUD)) {
836 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
837 spin_lock_irqsave(&info->lock,flags);
838 set_signals(info);
839 spin_unlock_irqrestore(&info->lock,flags);
840 }
841
842 /* Handle transition away from B0 status */
843 if (!(old_termios->c_cflag & CBAUD) &&
844 tty->termios->c_cflag & CBAUD) {
845 info->signals |= SerialSignal_DTR;
846 if (!(tty->termios->c_cflag & CRTSCTS) ||
847 !test_bit(TTY_THROTTLED, &tty->flags)) {
848 info->signals |= SerialSignal_RTS;
849 }
850 spin_lock_irqsave(&info->lock,flags);
851 set_signals(info);
852 spin_unlock_irqrestore(&info->lock,flags);
853 }
854
855 /* Handle turning off CRTSCTS */
856 if (old_termios->c_cflag & CRTSCTS &&
857 !(tty->termios->c_cflag & CRTSCTS)) {
858 tty->hw_stopped = 0;
859 tx_release(tty);
860 }
861}
862
863static int write(struct tty_struct *tty,
864 const unsigned char *buf, int count)
865{
866 int ret = 0;
867 struct slgt_info *info = tty->driver_data;
868 unsigned long flags;
869
870 if (sanity_check(info, tty->name, "write"))
871 goto cleanup;
872 DBGINFO(("%s write count=%d\n", info->device_name, count));
873
Eric Sesterhenn326f28e92006-06-25 05:48:48 -0700[diff] [blame]874 if (!info->tx_buf)
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]875 goto cleanup;
876
877 if (count > info->max_frame_size) {
878 ret = -EIO;
879 goto cleanup;
880 }
881
882 if (!count)
883 goto cleanup;
884
885 if (info->params.mode == MGSL_MODE_RAW) {
886 unsigned int bufs_needed = (count/DMABUFSIZE);
887 unsigned int bufs_free = free_tbuf_count(info);
888 if (count % DMABUFSIZE)
889 ++bufs_needed;
890 if (bufs_needed > bufs_free)
891 goto cleanup;
892 } else {
893 if (info->tx_active)
894 goto cleanup;
895 if (info->tx_count) {
896 /* send accumulated data from send_char() calls */
897 /* as frame and wait before accepting more data. */
898 tx_load(info, info->tx_buf, info->tx_count);
899 goto start;
900 }
901 }
902
903 ret = info->tx_count = count;
904 tx_load(info, buf, count);
905 goto start;
906
907start:
908 if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
909 spin_lock_irqsave(&info->lock,flags);
910 if (!info->tx_active)
911 tx_start(info);
912 spin_unlock_irqrestore(&info->lock,flags);
913 }
914
915cleanup:
916 DBGINFO(("%s write rc=%d\n", info->device_name, ret));
917 return ret;
918}
919
920static void put_char(struct tty_struct *tty, unsigned char ch)
921{
922 struct slgt_info *info = tty->driver_data;
923 unsigned long flags;
924
925 if (sanity_check(info, tty->name, "put_char"))
926 return;
927 DBGINFO(("%s put_char(%d)\n", info->device_name, ch));
Eric Sesterhenn326f28e92006-06-25 05:48:48 -0700[diff] [blame]928 if (!info->tx_buf)
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]929 return;
930 spin_lock_irqsave(&info->lock,flags);
931 if (!info->tx_active && (info->tx_count < info->max_frame_size))
932 info->tx_buf[info->tx_count++] = ch;
933 spin_unlock_irqrestore(&info->lock,flags);
934}
935
936static void send_xchar(struct tty_struct *tty, char ch)
937{
938 struct slgt_info *info = tty->driver_data;
939 unsigned long flags;
940
941 if (sanity_check(info, tty->name, "send_xchar"))
942 return;
943 DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch));
944 info->x_char = ch;
945 if (ch) {
946 spin_lock_irqsave(&info->lock,flags);
947 if (!info->tx_enabled)
948 tx_start(info);
949 spin_unlock_irqrestore(&info->lock,flags);
950 }
951}
952
953static void wait_until_sent(struct tty_struct *tty, int timeout)
954{
955 struct slgt_info *info = tty->driver_data;
956 unsigned long orig_jiffies, char_time;
957
958 if (!info )
959 return;
960 if (sanity_check(info, tty->name, "wait_until_sent"))
961 return;
962 DBGINFO(("%s wait_until_sent entry\n", info->device_name));
963 if (!(info->flags & ASYNC_INITIALIZED))
964 goto exit;
965
966 orig_jiffies = jiffies;
967
968 /* Set check interval to 1/5 of estimated time to
969 * send a character, and make it at least 1. The check
970 * interval should also be less than the timeout.
971 * Note: use tight timings here to satisfy the NIST-PCTS.
972 */
973
974 if (info->params.data_rate) {
975 char_time = info->timeout/(32 * 5);
976 if (!char_time)
977 char_time++;
978 } else
979 char_time = 1;
980
981 if (timeout)
982 char_time = min_t(unsigned long, char_time, timeout);
983
984 while (info->tx_active) {
985 msleep_interruptible(jiffies_to_msecs(char_time));
986 if (signal_pending(current))
987 break;
988 if (timeout && time_after(jiffies, orig_jiffies + timeout))
989 break;
990 }
991
992exit:
993 DBGINFO(("%s wait_until_sent exit\n", info->device_name));
994}
995
996static int write_room(struct tty_struct *tty)
997{
998 struct slgt_info *info = tty->driver_data;
999 int ret;
1000
1001 if (sanity_check(info, tty->name, "write_room"))
1002 return 0;
1003 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
1004 DBGINFO(("%s write_room=%d\n", info->device_name, ret));
1005 return ret;
1006}
1007
1008static void flush_chars(struct tty_struct *tty)
1009{
1010 struct slgt_info *info = tty->driver_data;
1011 unsigned long flags;
1012
1013 if (sanity_check(info, tty->name, "flush_chars"))
1014 return;
1015 DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count));
1016
1017 if (info->tx_count <= 0 || tty->stopped ||
1018 tty->hw_stopped || !info->tx_buf)
1019 return;
1020
1021 DBGINFO(("%s flush_chars start transmit\n", info->device_name));
1022
1023 spin_lock_irqsave(&info->lock,flags);
1024 if (!info->tx_active && info->tx_count) {
1025 tx_load(info, info->tx_buf,info->tx_count);
1026 tx_start(info);
1027 }
1028 spin_unlock_irqrestore(&info->lock,flags);
1029}
1030
1031static void flush_buffer(struct tty_struct *tty)
1032{
1033 struct slgt_info *info = tty->driver_data;
1034 unsigned long flags;
1035
1036 if (sanity_check(info, tty->name, "flush_buffer"))
1037 return;
1038 DBGINFO(("%s flush_buffer\n", info->device_name));
1039
1040 spin_lock_irqsave(&info->lock,flags);
1041 if (!info->tx_active)
1042 info->tx_count = 0;
1043 spin_unlock_irqrestore(&info->lock,flags);
1044
1045 wake_up_interruptible(&tty->write_wait);
1046 tty_wakeup(tty);
1047}
1048
1049/*
1050 * throttle (stop) transmitter
1051 */
1052static void tx_hold(struct tty_struct *tty)
1053{
1054 struct slgt_info *info = tty->driver_data;
1055 unsigned long flags;
1056
1057 if (sanity_check(info, tty->name, "tx_hold"))
1058 return;
1059 DBGINFO(("%s tx_hold\n", info->device_name));
1060 spin_lock_irqsave(&info->lock,flags);
1061 if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC)
1062 tx_stop(info);
1063 spin_unlock_irqrestore(&info->lock,flags);
1064}
1065
1066/*
1067 * release (start) transmitter
1068 */
1069static void tx_release(struct tty_struct *tty)
1070{
1071 struct slgt_info *info = tty->driver_data;
1072 unsigned long flags;
1073
1074 if (sanity_check(info, tty->name, "tx_release"))
1075 return;
1076 DBGINFO(("%s tx_release\n", info->device_name));
1077 spin_lock_irqsave(&info->lock,flags);
1078 if (!info->tx_active && info->tx_count) {
1079 tx_load(info, info->tx_buf, info->tx_count);
1080 tx_start(info);
1081 }
1082 spin_unlock_irqrestore(&info->lock,flags);
1083}
1084
1085/*
1086 * Service an IOCTL request
1087 *
1088 * Arguments
1089 *
1090 * tty pointer to tty instance data
1091 * file pointer to associated file object for device
1092 * cmd IOCTL command code
1093 * arg command argument/context
1094 *
1095 * Return 0 if success, otherwise error code
1096 */
1097static int ioctl(struct tty_struct *tty, struct file *file,
1098 unsigned int cmd, unsigned long arg)
1099{
1100 struct slgt_info *info = tty->driver_data;
1101 struct mgsl_icount cnow; /* kernel counter temps */
1102 struct serial_icounter_struct __user *p_cuser; /* user space */
1103 unsigned long flags;
1104 void __user *argp = (void __user *)arg;
1105
1106 if (sanity_check(info, tty->name, "ioctl"))
1107 return -ENODEV;
1108 DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd));
1109
1110 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1111 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1112 if (tty->flags & (1 << TTY_IO_ERROR))
1113 return -EIO;
1114 }
1115
1116 switch (cmd) {
1117 case MGSL_IOCGPARAMS:
1118 return get_params(info, argp);
1119 case MGSL_IOCSPARAMS:
1120 return set_params(info, argp);
1121 case MGSL_IOCGTXIDLE:
1122 return get_txidle(info, argp);
1123 case MGSL_IOCSTXIDLE:
1124 return set_txidle(info, (int)arg);
1125 case MGSL_IOCTXENABLE:
1126 return tx_enable(info, (int)arg);
1127 case MGSL_IOCRXENABLE:
1128 return rx_enable(info, (int)arg);
1129 case MGSL_IOCTXABORT:
1130 return tx_abort(info);
1131 case MGSL_IOCGSTATS:
1132 return get_stats(info, argp);
1133 case MGSL_IOCWAITEVENT:
1134 return wait_mgsl_event(info, argp);
1135 case TIOCMIWAIT:
1136 return modem_input_wait(info,(int)arg);
1137 case MGSL_IOCGIF:
1138 return get_interface(info, argp);
1139 case MGSL_IOCSIF:
1140 return set_interface(info,(int)arg);
Paul Fulghum0080b7a2006-03-28 01:56:15 -0800[diff] [blame]1141 case MGSL_IOCSGPIO:
1142 return set_gpio(info, argp);
1143 case MGSL_IOCGGPIO:
1144 return get_gpio(info, argp);
1145 case MGSL_IOCWAITGPIO:
1146 return wait_gpio(info, argp);
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]1147 case TIOCGICOUNT:
1148 spin_lock_irqsave(&info->lock,flags);
1149 cnow = info->icount;
1150 spin_unlock_irqrestore(&info->lock,flags);
1151 p_cuser = argp;
1152 if (put_user(cnow.cts, &p_cuser->cts) ||
1153 put_user(cnow.dsr, &p_cuser->dsr) ||
1154 put_user(cnow.rng, &p_cuser->rng) ||
1155 put_user(cnow.dcd, &p_cuser->dcd) ||
1156 put_user(cnow.rx, &p_cuser->rx) ||
1157 put_user(cnow.tx, &p_cuser->tx) ||
1158 put_user(cnow.frame, &p_cuser->frame) ||
1159 put_user(cnow.overrun, &p_cuser->overrun) ||
1160 put_user(cnow.parity, &p_cuser->parity) ||
1161 put_user(cnow.brk, &p_cuser->brk) ||
1162 put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
1163 return -EFAULT;
1164 return 0;
1165 default:
1166 return -ENOIOCTLCMD;
1167 }
1168 return 0;
1169}
1170
1171/*
1172 * proc fs support
1173 */
1174static inline int line_info(char *buf, struct slgt_info *info)
1175{
1176 char stat_buf[30];
1177 int ret;
1178 unsigned long flags;
1179
1180 ret = sprintf(buf, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n",
1181 info->device_name, info->phys_reg_addr,
1182 info->irq_level, info->max_frame_size);
1183
1184 /* output current serial signal states */
1185 spin_lock_irqsave(&info->lock,flags);
1186 get_signals(info);
1187 spin_unlock_irqrestore(&info->lock,flags);
1188
1189 stat_buf[0] = 0;
1190 stat_buf[1] = 0;
1191 if (info->signals & SerialSignal_RTS)
1192 strcat(stat_buf, "|RTS");
1193 if (info->signals & SerialSignal_CTS)
1194 strcat(stat_buf, "|CTS");
1195 if (info->signals & SerialSignal_DTR)
1196 strcat(stat_buf, "|DTR");
1197 if (info->signals & SerialSignal_DSR)
1198 strcat(stat_buf, "|DSR");
1199 if (info->signals & SerialSignal_DCD)
1200 strcat(stat_buf, "|CD");
1201 if (info->signals & SerialSignal_RI)
1202 strcat(stat_buf, "|RI");
1203
1204 if (info->params.mode != MGSL_MODE_ASYNC) {
1205 ret += sprintf(buf+ret, "\tHDLC txok:%d rxok:%d",
1206 info->icount.txok, info->icount.rxok);
1207 if (info->icount.txunder)
1208 ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
1209 if (info->icount.txabort)
1210 ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
1211 if (info->icount.rxshort)
1212 ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
1213 if (info->icount.rxlong)
1214 ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
1215 if (info->icount.rxover)
1216 ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
1217 if (info->icount.rxcrc)
1218 ret += sprintf(buf+ret, " rxcrc:%d", info->icount.rxcrc);
1219 } else {
1220 ret += sprintf(buf+ret, "\tASYNC tx:%d rx:%d",
1221 info->icount.tx, info->icount.rx);
1222 if (info->icount.frame)
1223 ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
1224 if (info->icount.parity)
1225 ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
1226 if (info->icount.brk)
1227 ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
1228 if (info->icount.overrun)
1229 ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
1230 }
1231
1232 /* Append serial signal status to end */
1233 ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1234
1235 ret += sprintf(buf+ret, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1236 info->tx_active,info->bh_requested,info->bh_running,
1237 info->pending_bh);
1238
1239 return ret;
1240}
1241
1242/* Called to print information about devices
1243 */
1244static int read_proc(char *page, char **start, off_t off, int count,
1245 int *eof, void *data)
1246{
1247 int len = 0, l;
1248 off_t begin = 0;
1249 struct slgt_info *info;
1250
1251 len += sprintf(page, "synclink_gt driver:%s\n", driver_version);
1252
1253 info = slgt_device_list;
1254 while( info ) {
1255 l = line_info(page + len, info);
1256 len += l;
1257 if (len+begin > off+count)
1258 goto done;
1259 if (len+begin < off) {
1260 begin += len;
1261 len = 0;
1262 }
1263 info = info->next_device;
1264 }
1265
1266 *eof = 1;
1267done:
1268 if (off >= len+begin)
1269 return 0;
1270 *start = page + (off-begin);
1271 return ((count < begin+len-off) ? count : begin+len-off);
1272}
1273
1274/*
1275 * return count of bytes in transmit buffer
1276 */
1277static int chars_in_buffer(struct tty_struct *tty)
1278{
1279 struct slgt_info *info = tty->driver_data;
1280 if (sanity_check(info, tty->name, "chars_in_buffer"))
1281 return 0;
1282 DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, info->tx_count));
1283 return info->tx_count;
1284}
1285
1286/*
1287 * signal remote device to throttle send data (our receive data)
1288 */
1289static void throttle(struct tty_struct * tty)
1290{
1291 struct slgt_info *info = tty->driver_data;
1292 unsigned long flags;
1293
1294 if (sanity_check(info, tty->name, "throttle"))
1295 return;
1296 DBGINFO(("%s throttle\n", info->device_name));
1297 if (I_IXOFF(tty))
1298 send_xchar(tty, STOP_CHAR(tty));
1299 if (tty->termios->c_cflag & CRTSCTS) {
1300 spin_lock_irqsave(&info->lock,flags);
1301 info->signals &= ~SerialSignal_RTS;
1302 set_signals(info);
1303 spin_unlock_irqrestore(&info->lock,flags);
1304 }
1305}
1306
1307/*
1308 * signal remote device to stop throttling send data (our receive data)
1309 */
1310static void unthrottle(struct tty_struct * tty)
1311{
1312 struct slgt_info *info = tty->driver_data;
1313 unsigned long flags;
1314
1315 if (sanity_check(info, tty->name, "unthrottle"))
1316 return;
1317 DBGINFO(("%s unthrottle\n", info->device_name));
1318 if (I_IXOFF(tty)) {
1319 if (info->x_char)
1320 info->x_char = 0;
1321 else
1322 send_xchar(tty, START_CHAR(tty));
1323 }
1324 if (tty->termios->c_cflag & CRTSCTS) {
1325 spin_lock_irqsave(&info->lock,flags);
1326 info->signals |= SerialSignal_RTS;
1327 set_signals(info);
1328 spin_unlock_irqrestore(&info->lock,flags);
1329 }
1330}
1331
1332/*
1333 * set or clear transmit break condition
1334 * break_state -1=set break condition, 0=clear
1335 */
1336static void set_break(struct tty_struct *tty, int break_state)
1337{
1338 struct slgt_info *info = tty->driver_data;
1339 unsigned short value;
1340 unsigned long flags;
1341
1342 if (sanity_check(info, tty->name, "set_break"))
1343 return;
1344 DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
1345
1346 spin_lock_irqsave(&info->lock,flags);
1347 value = rd_reg16(info, TCR);
1348 if (break_state == -1)
1349 value |= BIT6;
1350 else
1351 value &= ~BIT6;
1352 wr_reg16(info, TCR, value);
1353 spin_unlock_irqrestore(&info->lock,flags);
1354}
1355
1356#ifdef CONFIG_HDLC
1357
1358/**
1359 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1360 * set encoding and frame check sequence (FCS) options
1361 *
1362 * dev pointer to network device structure
1363 * encoding serial encoding setting
1364 * parity FCS setting
1365 *
1366 * returns 0 if success, otherwise error code
1367 */
1368static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1369 unsigned short parity)
1370{
1371 struct slgt_info *info = dev_to_port(dev);
1372 unsigned char new_encoding;
1373 unsigned short new_crctype;
1374
1375 /* return error if TTY interface open */
1376 if (info->count)
1377 return -EBUSY;
1378
1379 DBGINFO(("%s hdlcdev_attach\n", info->device_name));
1380
1381 switch (encoding)
1382 {
1383 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
1384 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1385 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1386 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1387 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1388 default: return -EINVAL;
1389 }
1390
1391 switch (parity)
1392 {
1393 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
1394 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1395 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1396 default: return -EINVAL;
1397 }
1398
1399 info->params.encoding = new_encoding;
Alexey Dobriyan53b35312006-03-24 03:16:13 -0800[diff] [blame]1400 info->params.crc_type = new_crctype;
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]1401
1402 /* if network interface up, reprogram hardware */
1403 if (info->netcount)
1404 program_hw(info);
1405
1406 return 0;
1407}
1408
1409/**
1410 * called by generic HDLC layer to send frame
1411 *
1412 * skb socket buffer containing HDLC frame
1413 * dev pointer to network device structure
1414 *
1415 * returns 0 if success, otherwise error code
1416 */
1417static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
1418{
1419 struct slgt_info *info = dev_to_port(dev);
1420 struct net_device_stats *stats = hdlc_stats(dev);
1421 unsigned long flags;
1422
1423 DBGINFO(("%s hdlc_xmit\n", dev->name));
1424
1425 /* stop sending until this frame completes */
1426 netif_stop_queue(dev);
1427
1428 /* copy data to device buffers */
1429 info->tx_count = skb->len;
1430 tx_load(info, skb->data, skb->len);
1431
1432 /* update network statistics */
1433 stats->tx_packets++;
1434 stats->tx_bytes += skb->len;
1435
1436 /* done with socket buffer, so free it */
1437 dev_kfree_skb(skb);
1438
1439 /* save start time for transmit timeout detection */
1440 dev->trans_start = jiffies;
1441
1442 /* start hardware transmitter if necessary */
1443 spin_lock_irqsave(&info->lock,flags);
1444 if (!info->tx_active)
1445 tx_start(info);
1446 spin_unlock_irqrestore(&info->lock,flags);
1447
1448 return 0;
1449}
1450
1451/**
1452 * called by network layer when interface enabled
1453 * claim resources and initialize hardware
1454 *
1455 * dev pointer to network device structure
1456 *
1457 * returns 0 if success, otherwise error code
1458 */
1459static int hdlcdev_open(struct net_device *dev)
1460{
1461 struct slgt_info *info = dev_to_port(dev);
1462 int rc;
1463 unsigned long flags;
1464
1465 DBGINFO(("%s hdlcdev_open\n", dev->name));
1466
1467 /* generic HDLC layer open processing */
1468 if ((rc = hdlc_open(dev)))
1469 return rc;
1470
1471 /* arbitrate between network and tty opens */
1472 spin_lock_irqsave(&info->netlock, flags);
1473 if (info->count != 0 || info->netcount != 0) {
1474 DBGINFO(("%s hdlc_open busy\n", dev->name));
1475 spin_unlock_irqrestore(&info->netlock, flags);
1476 return -EBUSY;
1477 }
1478 info->netcount=1;
1479 spin_unlock_irqrestore(&info->netlock, flags);
1480
1481 /* claim resources and init adapter */
1482 if ((rc = startup(info)) != 0) {
1483 spin_lock_irqsave(&info->netlock, flags);
1484 info->netcount=0;
1485 spin_unlock_irqrestore(&info->netlock, flags);
1486 return rc;
1487 }
1488
1489 /* assert DTR and RTS, apply hardware settings */
1490 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
1491 program_hw(info);
1492
1493 /* enable network layer transmit */
1494 dev->trans_start = jiffies;
1495 netif_start_queue(dev);
1496
1497 /* inform generic HDLC layer of current DCD status */
1498 spin_lock_irqsave(&info->lock, flags);
1499 get_signals(info);
1500 spin_unlock_irqrestore(&info->lock, flags);
1501 hdlc_set_carrier(info->signals & SerialSignal_DCD, dev);
1502
1503 return 0;
1504}
1505
1506/**
1507 * called by network layer when interface is disabled
1508 * shutdown hardware and release resources
1509 *
1510 * dev pointer to network device structure
1511 *
1512 * returns 0 if success, otherwise error code
1513 */
1514static int hdlcdev_close(struct net_device *dev)
1515{
1516 struct slgt_info *info = dev_to_port(dev);
1517 unsigned long flags;
1518
1519 DBGINFO(("%s hdlcdev_close\n", dev->name));
1520
1521 netif_stop_queue(dev);
1522
1523 /* shutdown adapter and release resources */
1524 shutdown(info);
1525
1526 hdlc_close(dev);
1527
1528 spin_lock_irqsave(&info->netlock, flags);
1529 info->netcount=0;
1530 spin_unlock_irqrestore(&info->netlock, flags);
1531
1532 return 0;
1533}
1534
1535/**
1536 * called by network layer to process IOCTL call to network device
1537 *
1538 * dev pointer to network device structure
1539 * ifr pointer to network interface request structure
1540 * cmd IOCTL command code
1541 *
1542 * returns 0 if success, otherwise error code
1543 */
1544static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1545{
1546 const size_t size = sizeof(sync_serial_settings);
1547 sync_serial_settings new_line;
1548 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1549 struct slgt_info *info = dev_to_port(dev);
1550 unsigned int flags;
1551
1552 DBGINFO(("%s hdlcdev_ioctl\n", dev->name));
1553
1554 /* return error if TTY interface open */
1555 if (info->count)
1556 return -EBUSY;
1557
1558 if (cmd != SIOCWANDEV)
1559 return hdlc_ioctl(dev, ifr, cmd);
1560
1561 switch(ifr->ifr_settings.type) {
1562 case IF_GET_IFACE: /* return current sync_serial_settings */
1563
1564 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1565 if (ifr->ifr_settings.size < size) {
1566 ifr->ifr_settings.size = size; /* data size wanted */
1567 return -ENOBUFS;
1568 }
1569
1570 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1571 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1572 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1573 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1574
1575 switch (flags){
1576 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1577 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
1578 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
1579 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1580 default: new_line.clock_type = CLOCK_DEFAULT;
1581 }
1582
1583 new_line.clock_rate = info->params.clock_speed;
1584 new_line.loopback = info->params.loopback ? 1:0;
1585
1586 if (copy_to_user(line, &new_line, size))
1587 return -EFAULT;
1588 return 0;
1589
1590 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1591
1592 if(!capable(CAP_NET_ADMIN))
1593 return -EPERM;
1594 if (copy_from_user(&new_line, line, size))
1595 return -EFAULT;
1596
1597 switch (new_line.clock_type)
1598 {
1599 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1600 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1601 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
1602 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
1603 case CLOCK_DEFAULT: flags = info->params.flags &
1604 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1605 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1606 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1607 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
1608 default: return -EINVAL;
1609 }
1610
1611 if (new_line.loopback != 0 && new_line.loopback != 1)
1612 return -EINVAL;
1613
1614 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1615 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1616 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1617 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1618 info->params.flags |= flags;
1619
1620 info->params.loopback = new_line.loopback;
1621
1622 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1623 info->params.clock_speed = new_line.clock_rate;
1624 else
1625 info->params.clock_speed = 0;
1626
1627 /* if network interface up, reprogram hardware */
1628 if (info->netcount)
1629 program_hw(info);
1630 return 0;
1631
1632 default:
1633 return hdlc_ioctl(dev, ifr, cmd);
1634 }
1635}
1636
1637/**
1638 * called by network layer when transmit timeout is detected
1639 *
1640 * dev pointer to network device structure
1641 */
1642static void hdlcdev_tx_timeout(struct net_device *dev)
1643{
1644 struct slgt_info *info = dev_to_port(dev);
1645 struct net_device_stats *stats = hdlc_stats(dev);
1646 unsigned long flags;
1647
1648 DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name));
1649
1650 stats->tx_errors++;
1651 stats->tx_aborted_errors++;
1652
1653 spin_lock_irqsave(&info->lock,flags);
1654 tx_stop(info);
1655 spin_unlock_irqrestore(&info->lock,flags);
1656
1657 netif_wake_queue(dev);
1658}
1659
1660/**
1661 * called by device driver when transmit completes
1662 * reenable network layer transmit if stopped
1663 *
1664 * info pointer to device instance information
1665 */
1666static void hdlcdev_tx_done(struct slgt_info *info)
1667{
1668 if (netif_queue_stopped(info->netdev))
1669 netif_wake_queue(info->netdev);
1670}
1671
1672/**
1673 * called by device driver when frame received
1674 * pass frame to network layer
1675 *
1676 * info pointer to device instance information
1677 * buf pointer to buffer contianing frame data
1678 * size count of data bytes in buf
1679 */
1680static void hdlcdev_rx(struct slgt_info *info, char *buf, int size)
1681{
1682 struct sk_buff *skb = dev_alloc_skb(size);
1683 struct net_device *dev = info->netdev;
1684 struct net_device_stats *stats = hdlc_stats(dev);
1685
1686 DBGINFO(("%s hdlcdev_rx\n", dev->name));
1687
1688 if (skb == NULL) {
1689 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name));
1690 stats->rx_dropped++;
1691 return;
1692 }
1693
1694 memcpy(skb_put(skb, size),buf,size);
1695
1696 skb->protocol = hdlc_type_trans(skb, info->netdev);
1697
1698 stats->rx_packets++;
1699 stats->rx_bytes += size;
1700
1701 netif_rx(skb);
1702
1703 info->netdev->last_rx = jiffies;
1704}
1705
1706/**
1707 * called by device driver when adding device instance
1708 * do generic HDLC initialization
1709 *
1710 * info pointer to device instance information
1711 *
1712 * returns 0 if success, otherwise error code
1713 */
1714static int hdlcdev_init(struct slgt_info *info)
1715{
1716 int rc;
1717 struct net_device *dev;
1718 hdlc_device *hdlc;
1719
1720 /* allocate and initialize network and HDLC layer objects */
1721
1722 if (!(dev = alloc_hdlcdev(info))) {
1723 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name);
1724 return -ENOMEM;
1725 }
1726
1727 /* for network layer reporting purposes only */
1728 dev->mem_start = info->phys_reg_addr;
1729 dev->mem_end = info->phys_reg_addr + SLGT_REG_SIZE - 1;
1730 dev->irq = info->irq_level;
1731
1732 /* network layer callbacks and settings */
1733 dev->do_ioctl = hdlcdev_ioctl;
1734 dev->open = hdlcdev_open;
1735 dev->stop = hdlcdev_close;
1736 dev->tx_timeout = hdlcdev_tx_timeout;
1737 dev->watchdog_timeo = 10*HZ;
1738 dev->tx_queue_len = 50;
1739
1740 /* generic HDLC layer callbacks and settings */
1741 hdlc = dev_to_hdlc(dev);
1742 hdlc->attach = hdlcdev_attach;
1743 hdlc->xmit = hdlcdev_xmit;
1744
1745 /* register objects with HDLC layer */
1746 if ((rc = register_hdlc_device(dev))) {
1747 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1748 free_netdev(dev);
1749 return rc;
1750 }
1751
1752 info->netdev = dev;
1753 return 0;
1754}
1755
1756/**
1757 * called by device driver when removing device instance
1758 * do generic HDLC cleanup
1759 *
1760 * info pointer to device instance information
1761 */
1762static void hdlcdev_exit(struct slgt_info *info)
1763{
1764 unregister_hdlc_device(info->netdev);
1765 free_netdev(info->netdev);
1766 info->netdev = NULL;
1767}
1768
1769#endif /* ifdef CONFIG_HDLC */
1770
1771/*
1772 * get async data from rx DMA buffers
1773 */
1774static void rx_async(struct slgt_info *info)
1775{
1776 struct tty_struct *tty = info->tty;
1777 struct mgsl_icount *icount = &info->icount;
1778 unsigned int start, end;
1779 unsigned char *p;
1780 unsigned char status;
1781 struct slgt_desc *bufs = info->rbufs;
1782 int i, count;
Alan Cox33f0f882006-01-09 20:54:13 -0800[diff] [blame]1783 int chars = 0;
1784 int stat;
1785 unsigned char ch;
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]1786
1787 start = end = info->rbuf_current;
1788
1789 while(desc_complete(bufs[end])) {
1790 count = desc_count(bufs[end]) - info->rbuf_index;
1791 p = bufs[end].buf + info->rbuf_index;
1792
1793 DBGISR(("%s rx_async count=%d\n", info->device_name, count));
1794 DBGDATA(info, p, count, "rx");
1795
1796 for(i=0 ; i < count; i+=2, p+=2) {
Alan Cox33f0f882006-01-09 20:54:13 -0800[diff] [blame]1797 ch = *p;
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]1798 icount->rx++;
1799
Alan Cox33f0f882006-01-09 20:54:13 -0800[diff] [blame]1800 stat = 0;
1801
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]1802 if ((status = *(p+1) & (BIT9 + BIT8))) {
1803 if (status & BIT9)
1804 icount->parity++;
1805 else if (status & BIT8)
1806 icount->frame++;
1807 /* discard char if tty control flags say so */
1808 if (status & info->ignore_status_mask)
1809 continue;
Alan Cox33f0f882006-01-09 20:54:13 -0800[diff] [blame]1810 if (status & BIT9)
1811 stat = TTY_PARITY;
1812 else if (status & BIT8)
1813 stat = TTY_FRAME;
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]1814 }
1815 if (tty) {
Alan Cox33f0f882006-01-09 20:54:13 -0800[diff] [blame]1816 tty_insert_flip_char(tty, ch, stat);
1817 chars++;
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]1818 }
1819 }
1820
1821 if (i < count) {
1822 /* receive buffer not completed */
1823 info->rbuf_index += i;
1824 info->rx_timer.expires = jiffies + 1;
1825 add_timer(&info->rx_timer);
1826 break;
1827 }
1828
1829 info->rbuf_index = 0;
1830 free_rbufs(info, end, end);
1831
1832 if (++end == info->rbuf_count)
1833 end = 0;
1834
1835 /* if entire list searched then no frame available */
1836 if (end == start)
1837 break;
1838 }
1839
Alan Cox33f0f882006-01-09 20:54:13 -0800[diff] [blame]1840 if (tty && chars)
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]1841 tty_flip_buffer_push(tty);
1842}
1843
1844/*
1845 * return next bottom half action to perform
1846 */
1847static int bh_action(struct slgt_info *info)
1848{
1849 unsigned long flags;
1850 int rc;
1851
1852 spin_lock_irqsave(&info->lock,flags);
1853
1854 if (info->pending_bh & BH_RECEIVE) {
1855 info->pending_bh &= ~BH_RECEIVE;
1856 rc = BH_RECEIVE;
1857 } else if (info->pending_bh & BH_TRANSMIT) {
1858 info->pending_bh &= ~BH_TRANSMIT;
1859 rc = BH_TRANSMIT;
1860 } else if (info->pending_bh & BH_STATUS) {
1861 info->pending_bh &= ~BH_STATUS;
1862 rc = BH_STATUS;
1863 } else {
1864 /* Mark BH routine as complete */
1865 info->bh_running = 0;
1866 info->bh_requested = 0;
1867 rc = 0;
1868 }
1869
1870 spin_unlock_irqrestore(&info->lock,flags);
1871
1872 return rc;
1873}
1874
1875/*
1876 * perform bottom half processing
1877 */
1878static void bh_handler(void* context)
1879{
1880 struct slgt_info *info = context;
1881 int action;
1882
1883 if (!info)
1884 return;
1885 info->bh_running = 1;
1886
1887 while((action = bh_action(info))) {
1888 switch (action) {
1889 case BH_RECEIVE:
1890 DBGBH(("%s bh receive\n", info->device_name));
1891 switch(info->params.mode) {
1892 case MGSL_MODE_ASYNC:
1893 rx_async(info);
1894 break;
1895 case MGSL_MODE_HDLC:
1896 while(rx_get_frame(info));
1897 break;
1898 case MGSL_MODE_RAW:
1899 while(rx_get_buf(info));
1900 break;
1901 }
1902 /* restart receiver if rx DMA buffers exhausted */
1903 if (info->rx_restart)
1904 rx_start(info);
1905 break;
1906 case BH_TRANSMIT:
1907 bh_transmit(info);
1908 break;
1909 case BH_STATUS:
1910 DBGBH(("%s bh status\n", info->device_name));
1911 info->ri_chkcount = 0;
1912 info->dsr_chkcount = 0;
1913 info->dcd_chkcount = 0;
1914 info->cts_chkcount = 0;
1915 break;
1916 default:
1917 DBGBH(("%s unknown action\n", info->device_name));
1918 break;
1919 }
1920 }
1921 DBGBH(("%s bh_handler exit\n", info->device_name));
1922}
1923
1924static void bh_transmit(struct slgt_info *info)
1925{
1926 struct tty_struct *tty = info->tty;
1927
1928 DBGBH(("%s bh_transmit\n", info->device_name));
1929 if (tty) {
1930 tty_wakeup(tty);
1931 wake_up_interruptible(&tty->write_wait);
1932 }
1933}
1934
1935static void dsr_change(struct slgt_info *info)
1936{
1937 get_signals(info);
1938 DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
1939 if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
1940 slgt_irq_off(info, IRQ_DSR);
1941 return;
1942 }
1943 info->icount.dsr++;
1944 if (info->signals & SerialSignal_DSR)
1945 info->input_signal_events.dsr_up++;
1946 else
1947 info->input_signal_events.dsr_down++;
1948 wake_up_interruptible(&info->status_event_wait_q);
1949 wake_up_interruptible(&info->event_wait_q);
1950 info->pending_bh |= BH_STATUS;
1951}
1952
1953static void cts_change(struct slgt_info *info)
1954{
1955 get_signals(info);
1956 DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
1957 if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
1958 slgt_irq_off(info, IRQ_CTS);
1959 return;
1960 }
1961 info->icount.cts++;
1962 if (info->signals & SerialSignal_CTS)
1963 info->input_signal_events.cts_up++;
1964 else
1965 info->input_signal_events.cts_down++;
1966 wake_up_interruptible(&info->status_event_wait_q);
1967 wake_up_interruptible(&info->event_wait_q);
1968 info->pending_bh |= BH_STATUS;
1969
1970 if (info->flags & ASYNC_CTS_FLOW) {
1971 if (info->tty) {
1972 if (info->tty->hw_stopped) {
1973 if (info->signals & SerialSignal_CTS) {
1974 info->tty->hw_stopped = 0;
1975 info->pending_bh |= BH_TRANSMIT;
1976 return;
1977 }
1978 } else {
1979 if (!(info->signals & SerialSignal_CTS))
1980 info->tty->hw_stopped = 1;
1981 }
1982 }
1983 }
1984}
1985
1986static void dcd_change(struct slgt_info *info)
1987{
1988 get_signals(info);
1989 DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
1990 if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
1991 slgt_irq_off(info, IRQ_DCD);
1992 return;
1993 }
1994 info->icount.dcd++;
1995 if (info->signals & SerialSignal_DCD) {
1996 info->input_signal_events.dcd_up++;
1997 } else {
1998 info->input_signal_events.dcd_down++;
1999 }
2000#ifdef CONFIG_HDLC
2001 if (info->netcount)
2002 hdlc_set_carrier(info->signals & SerialSignal_DCD, info->netdev);
2003#endif
2004 wake_up_interruptible(&info->status_event_wait_q);
2005 wake_up_interruptible(&info->event_wait_q);
2006 info->pending_bh |= BH_STATUS;
2007
2008 if (info->flags & ASYNC_CHECK_CD) {
2009 if (info->signals & SerialSignal_DCD)
2010 wake_up_interruptible(&info->open_wait);
2011 else {
2012 if (info->tty)
2013 tty_hangup(info->tty);
2014 }
2015 }
2016}
2017
2018static void ri_change(struct slgt_info *info)
2019{
2020 get_signals(info);
2021 DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
2022 if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2023 slgt_irq_off(info, IRQ_RI);
2024 return;
2025 }
2026 info->icount.dcd++;
2027 if (info->signals & SerialSignal_RI) {
2028 info->input_signal_events.ri_up++;
2029 } else {
2030 info->input_signal_events.ri_down++;
2031 }
2032 wake_up_interruptible(&info->status_event_wait_q);
2033 wake_up_interruptible(&info->event_wait_q);
2034 info->pending_bh |= BH_STATUS;
2035}
2036
2037static void isr_serial(struct slgt_info *info)
2038{
2039 unsigned short status = rd_reg16(info, SSR);
2040
2041 DBGISR(("%s isr_serial status=%04X\n", info->device_name, status));
2042
2043 wr_reg16(info, SSR, status); /* clear pending */
2044
2045 info->irq_occurred = 1;
2046
2047 if (info->params.mode == MGSL_MODE_ASYNC) {
2048 if (status & IRQ_TXIDLE) {
2049 if (info->tx_count)
2050 isr_txeom(info, status);
2051 }
2052 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) {
2053 info->icount.brk++;
2054 /* process break detection if tty control allows */
2055 if (info->tty) {
2056 if (!(status & info->ignore_status_mask)) {
2057 if (info->read_status_mask & MASK_BREAK) {
Alan Cox33f0f882006-01-09 20:54:13 -0800[diff] [blame]2058 tty_insert_flip_char(info->tty, 0, TTY_BREAK);
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]2059 if (info->flags & ASYNC_SAK)
2060 do_SAK(info->tty);
2061 }
2062 }
2063 }
2064 }
2065 } else {
2066 if (status & (IRQ_TXIDLE + IRQ_TXUNDER))
2067 isr_txeom(info, status);
2068
2069 if (status & IRQ_RXIDLE) {
2070 if (status & RXIDLE)
2071 info->icount.rxidle++;
2072 else
2073 info->icount.exithunt++;
2074 wake_up_interruptible(&info->event_wait_q);
2075 }
2076
2077 if (status & IRQ_RXOVER)
2078 rx_start(info);
2079 }
2080
2081 if (status & IRQ_DSR)
2082 dsr_change(info);
2083 if (status & IRQ_CTS)
2084 cts_change(info);
2085 if (status & IRQ_DCD)
2086 dcd_change(info);
2087 if (status & IRQ_RI)
2088 ri_change(info);
2089}
2090
2091static void isr_rdma(struct slgt_info *info)
2092{
2093 unsigned int status = rd_reg32(info, RDCSR);
2094
2095 DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status));
2096
2097 /* RDCSR (rx DMA control/status)
2098 *
2099 * 31..07 reserved
2100 * 06 save status byte to DMA buffer
2101 * 05 error
2102 * 04 eol (end of list)
2103 * 03 eob (end of buffer)
2104 * 02 IRQ enable
2105 * 01 reset
2106 * 00 enable
2107 */
2108 wr_reg32(info, RDCSR, status); /* clear pending */
2109
2110 if (status & (BIT5 + BIT4)) {
2111 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name));
2112 info->rx_restart = 1;
2113 }
2114 info->pending_bh |= BH_RECEIVE;
2115}
2116
2117static void isr_tdma(struct slgt_info *info)
2118{
2119 unsigned int status = rd_reg32(info, TDCSR);
2120
2121 DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status));
2122
2123 /* TDCSR (tx DMA control/status)
2124 *
2125 * 31..06 reserved
2126 * 05 error
2127 * 04 eol (end of list)
2128 * 03 eob (end of buffer)
2129 * 02 IRQ enable
2130 * 01 reset
2131 * 00 enable
2132 */
2133 wr_reg32(info, TDCSR, status); /* clear pending */
2134
2135 if (status & (BIT5 + BIT4 + BIT3)) {
2136 // another transmit buffer has completed
2137 // run bottom half to get more send data from user
2138 info->pending_bh |= BH_TRANSMIT;
2139 }
2140}
2141
2142static void isr_txeom(struct slgt_info *info, unsigned short status)
2143{
2144 DBGISR(("%s txeom status=%04x\n", info->device_name, status));
2145
2146 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
2147 tdma_reset(info);
2148 reset_tbufs(info);
2149 if (status & IRQ_TXUNDER) {
2150 unsigned short val = rd_reg16(info, TCR);
2151 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
2152 wr_reg16(info, TCR, val); /* clear reset bit */
2153 }
2154
2155 if (info->tx_active) {
2156 if (info->params.mode != MGSL_MODE_ASYNC) {
2157 if (status & IRQ_TXUNDER)
2158 info->icount.txunder++;
2159 else if (status & IRQ_TXIDLE)
2160 info->icount.txok++;
2161 }
2162
2163 info->tx_active = 0;
2164 info->tx_count = 0;
2165
2166 del_timer(&info->tx_timer);
2167
2168 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) {
2169 info->signals &= ~SerialSignal_RTS;
2170 info->drop_rts_on_tx_done = 0;
2171 set_signals(info);
2172 }
2173
2174#ifdef CONFIG_HDLC
2175 if (info->netcount)
2176 hdlcdev_tx_done(info);
2177 else
2178#endif
2179 {
2180 if (info->tty && (info->tty->stopped || info->tty->hw_stopped)) {
2181 tx_stop(info);
2182 return;
2183 }
2184 info->pending_bh |= BH_TRANSMIT;
2185 }
2186 }
2187}
2188
Paul Fulghum0080b7a2006-03-28 01:56:15 -0800[diff] [blame]2189static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state)
2190{
2191 struct cond_wait *w, *prev;
2192
2193 /* wake processes waiting for specific transitions */
2194 for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) {
2195 if (w->data & changed) {
2196 w->data = state;
2197 wake_up_interruptible(&w->q);
2198 if (prev != NULL)
2199 prev->next = w->next;
2200 else
2201 info->gpio_wait_q = w->next;
2202 } else
2203 prev = w;
2204 }
2205}
2206
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]2207/* interrupt service routine
2208 *
2209 * irq interrupt number
2210 * dev_id device ID supplied during interrupt registration
2211 * regs interrupted processor context
2212 */
2213static irqreturn_t slgt_interrupt(int irq, void *dev_id, struct pt_regs * regs)
2214{
2215 struct slgt_info *info;
2216 unsigned int gsr;
2217 unsigned int i;
2218
2219 DBGISR(("slgt_interrupt irq=%d entry\n", irq));
2220
2221 info = dev_id;
2222 if (!info)
2223 return IRQ_NONE;
2224
2225 spin_lock(&info->lock);
2226
2227 while((gsr = rd_reg32(info, GSR) & 0xffffff00)) {
2228 DBGISR(("%s gsr=%08x\n", info->device_name, gsr));
2229 info->irq_occurred = 1;
2230 for(i=0; i < info->port_count ; i++) {
2231 if (info->port_array[i] == NULL)
2232 continue;
2233 if (gsr & (BIT8 << i))
2234 isr_serial(info->port_array[i]);
2235 if (gsr & (BIT16 << (i*2)))
2236 isr_rdma(info->port_array[i]);
2237 if (gsr & (BIT17 << (i*2)))
2238 isr_tdma(info->port_array[i]);
2239 }
2240 }
2241
Paul Fulghum0080b7a2006-03-28 01:56:15 -0800[diff] [blame]2242 if (info->gpio_present) {
2243 unsigned int state;
2244 unsigned int changed;
2245 while ((changed = rd_reg32(info, IOSR)) != 0) {
2246 DBGISR(("%s iosr=%08x\n", info->device_name, changed));
2247 /* read latched state of GPIO signals */
2248 state = rd_reg32(info, IOVR);
2249 /* clear pending GPIO interrupt bits */
2250 wr_reg32(info, IOSR, changed);
2251 for (i=0 ; i < info->port_count ; i++) {
2252 if (info->port_array[i] != NULL)
2253 isr_gpio(info->port_array[i], changed, state);
2254 }
2255 }
2256 }
2257
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]2258 for(i=0; i < info->port_count ; i++) {
2259 struct slgt_info *port = info->port_array[i];
2260
2261 if (port && (port->count || port->netcount) &&
2262 port->pending_bh && !port->bh_running &&
2263 !port->bh_requested) {
2264 DBGISR(("%s bh queued\n", port->device_name));
2265 schedule_work(&port->task);
2266 port->bh_requested = 1;
2267 }
2268 }
2269
2270 spin_unlock(&info->lock);
2271
2272 DBGISR(("slgt_interrupt irq=%d exit\n", irq));
2273 return IRQ_HANDLED;
2274}
2275
2276static int startup(struct slgt_info *info)
2277{
2278 DBGINFO(("%s startup\n", info->device_name));
2279
2280 if (info->flags & ASYNC_INITIALIZED)
2281 return 0;
2282
2283 if (!info->tx_buf) {
2284 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2285 if (!info->tx_buf) {
2286 DBGERR(("%s can't allocate tx buffer\n", info->device_name));
2287 return -ENOMEM;
2288 }
2289 }
2290
2291 info->pending_bh = 0;
2292
2293 memset(&info->icount, 0, sizeof(info->icount));
2294
2295 /* program hardware for current parameters */
2296 change_params(info);
2297
2298 if (info->tty)
2299 clear_bit(TTY_IO_ERROR, &info->tty->flags);
2300
2301 info->flags |= ASYNC_INITIALIZED;
2302
2303 return 0;
2304}
2305
2306/*
2307 * called by close() and hangup() to shutdown hardware
2308 */
2309static void shutdown(struct slgt_info *info)
2310{
2311 unsigned long flags;
2312
2313 if (!(info->flags & ASYNC_INITIALIZED))
2314 return;
2315
2316 DBGINFO(("%s shutdown\n", info->device_name));
2317
2318 /* clear status wait queue because status changes */
2319 /* can't happen after shutting down the hardware */
2320 wake_up_interruptible(&info->status_event_wait_q);
2321 wake_up_interruptible(&info->event_wait_q);
2322
2323 del_timer_sync(&info->tx_timer);
2324 del_timer_sync(&info->rx_timer);
2325
2326 kfree(info->tx_buf);
2327 info->tx_buf = NULL;
2328
2329 spin_lock_irqsave(&info->lock,flags);
2330
2331 tx_stop(info);
2332 rx_stop(info);
2333
2334 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
2335
2336 if (!info->tty || info->tty->termios->c_cflag & HUPCL) {
2337 info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2338 set_signals(info);
2339 }
2340
Paul Fulghum0080b7a2006-03-28 01:56:15 -0800[diff] [blame]2341 flush_cond_wait(&info->gpio_wait_q);
2342
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]2343 spin_unlock_irqrestore(&info->lock,flags);
2344
2345 if (info->tty)
2346 set_bit(TTY_IO_ERROR, &info->tty->flags);
2347
2348 info->flags &= ~ASYNC_INITIALIZED;
2349}
2350
2351static void program_hw(struct slgt_info *info)
2352{
2353 unsigned long flags;
2354
2355 spin_lock_irqsave(&info->lock,flags);
2356
2357 rx_stop(info);
2358 tx_stop(info);
2359
2360 if (info->params.mode == MGSL_MODE_HDLC ||
2361 info->params.mode == MGSL_MODE_RAW ||
2362 info->netcount)
2363 hdlc_mode(info);
2364 else
2365 async_mode(info);
2366
2367 set_signals(info);
2368
2369 info->dcd_chkcount = 0;
2370 info->cts_chkcount = 0;
2371 info->ri_chkcount = 0;
2372 info->dsr_chkcount = 0;
2373
2374 slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR);
2375 get_signals(info);
2376
2377 if (info->netcount ||
2378 (info->tty && info->tty->termios->c_cflag & CREAD))
2379 rx_start(info);
2380
2381 spin_unlock_irqrestore(&info->lock,flags);
2382}
2383
2384/*
2385 * reconfigure adapter based on new parameters
2386 */
2387static void change_params(struct slgt_info *info)
2388{
2389 unsigned cflag;
2390 int bits_per_char;
2391
2392 if (!info->tty || !info->tty->termios)
2393 return;
2394 DBGINFO(("%s change_params\n", info->device_name));
2395
2396 cflag = info->tty->termios->c_cflag;
2397
2398 /* if B0 rate (hangup) specified then negate DTR and RTS */
2399 /* otherwise assert DTR and RTS */
2400 if (cflag & CBAUD)
2401 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
2402 else
2403 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2404
2405 /* byte size and parity */
2406
2407 switch (cflag & CSIZE) {
2408 case CS5: info->params.data_bits = 5; break;
2409 case CS6: info->params.data_bits = 6; break;
2410 case CS7: info->params.data_bits = 7; break;
2411 case CS8: info->params.data_bits = 8; break;
2412 default: info->params.data_bits = 7; break;
2413 }
2414
2415 info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1;
2416
2417 if (cflag & PARENB)
2418 info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN;
2419 else
2420 info->params.parity = ASYNC_PARITY_NONE;
2421
2422 /* calculate number of jiffies to transmit a full
2423 * FIFO (32 bytes) at specified data rate
2424 */
2425 bits_per_char = info->params.data_bits +
2426 info->params.stop_bits + 1;
2427
2428 info->params.data_rate = tty_get_baud_rate(info->tty);
2429
2430 if (info->params.data_rate) {
2431 info->timeout = (32*HZ*bits_per_char) /
2432 info->params.data_rate;
2433 }
2434 info->timeout += HZ/50; /* Add .02 seconds of slop */
2435
2436 if (cflag & CRTSCTS)
2437 info->flags |= ASYNC_CTS_FLOW;
2438 else
2439 info->flags &= ~ASYNC_CTS_FLOW;
2440
2441 if (cflag & CLOCAL)
2442 info->flags &= ~ASYNC_CHECK_CD;
2443 else
2444 info->flags |= ASYNC_CHECK_CD;
2445
2446 /* process tty input control flags */
2447
2448 info->read_status_mask = IRQ_RXOVER;
2449 if (I_INPCK(info->tty))
2450 info->read_status_mask |= MASK_PARITY | MASK_FRAMING;
2451 if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
2452 info->read_status_mask |= MASK_BREAK;
2453 if (I_IGNPAR(info->tty))
2454 info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING;
2455 if (I_IGNBRK(info->tty)) {
2456 info->ignore_status_mask |= MASK_BREAK;
2457 /* If ignoring parity and break indicators, ignore
2458 * overruns too. (For real raw support).
2459 */
2460 if (I_IGNPAR(info->tty))
2461 info->ignore_status_mask |= MASK_OVERRUN;
2462 }
2463
2464 program_hw(info);
2465}
2466
2467static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount)
2468{
2469 DBGINFO(("%s get_stats\n", info->device_name));
2470 if (!user_icount) {
2471 memset(&info->icount, 0, sizeof(info->icount));
2472 } else {
2473 if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount)))
2474 return -EFAULT;
2475 }
2476 return 0;
2477}
2478
2479static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params)
2480{
2481 DBGINFO(("%s get_params\n", info->device_name));
2482 if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS)))
2483 return -EFAULT;
2484 return 0;
2485}
2486
2487static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params)
2488{
2489 unsigned long flags;
2490 MGSL_PARAMS tmp_params;
2491
2492 DBGINFO(("%s set_params\n", info->device_name));
2493 if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS)))
2494 return -EFAULT;
2495
2496 spin_lock_irqsave(&info->lock, flags);
2497 memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS));
2498 spin_unlock_irqrestore(&info->lock, flags);
2499
2500 change_params(info);
2501
2502 return 0;
2503}
2504
2505static int get_txidle(struct slgt_info *info, int __user *idle_mode)
2506{
2507 DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode));
2508 if (put_user(info->idle_mode, idle_mode))
2509 return -EFAULT;
2510 return 0;
2511}
2512
2513static int set_txidle(struct slgt_info *info, int idle_mode)
2514{
2515 unsigned long flags;
2516 DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode));
2517 spin_lock_irqsave(&info->lock,flags);
2518 info->idle_mode = idle_mode;
Paul Fulghum643f3312006-06-25 05:49:20 -0700[diff] [blame]2519 if (info->params.mode != MGSL_MODE_ASYNC)
2520 tx_set_idle(info);
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]2521 spin_unlock_irqrestore(&info->lock,flags);
2522 return 0;
2523}
2524
2525static int tx_enable(struct slgt_info *info, int enable)
2526{
2527 unsigned long flags;
2528 DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable));
2529 spin_lock_irqsave(&info->lock,flags);
2530 if (enable) {
2531 if (!info->tx_enabled)
2532 tx_start(info);
2533 } else {
2534 if (info->tx_enabled)
2535 tx_stop(info);
2536 }
2537 spin_unlock_irqrestore(&info->lock,flags);
2538 return 0;
2539}
2540
2541/*
2542 * abort transmit HDLC frame
2543 */
2544static int tx_abort(struct slgt_info *info)
2545{
2546 unsigned long flags;
2547 DBGINFO(("%s tx_abort\n", info->device_name));
2548 spin_lock_irqsave(&info->lock,flags);
2549 tdma_reset(info);
2550 spin_unlock_irqrestore(&info->lock,flags);
2551 return 0;
2552}
2553
2554static int rx_enable(struct slgt_info *info, int enable)
2555{
2556 unsigned long flags;
2557 DBGINFO(("%s rx_enable(%d)\n", info->device_name, enable));
2558 spin_lock_irqsave(&info->lock,flags);
2559 if (enable) {
2560 if (!info->rx_enabled)
2561 rx_start(info);
2562 } else {
2563 if (info->rx_enabled)
2564 rx_stop(info);
2565 }
2566 spin_unlock_irqrestore(&info->lock,flags);
2567 return 0;
2568}
2569
2570/*
2571 * wait for specified event to occur
2572 */
2573static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr)
2574{
2575 unsigned long flags;
2576 int s;
2577 int rc=0;
2578 struct mgsl_icount cprev, cnow;
2579 int events;
2580 int mask;
2581 struct _input_signal_events oldsigs, newsigs;
2582 DECLARE_WAITQUEUE(wait, current);
2583
2584 if (get_user(mask, mask_ptr))
2585 return -EFAULT;
2586
2587 DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask));
2588
2589 spin_lock_irqsave(&info->lock,flags);
2590
2591 /* return immediately if state matches requested events */
2592 get_signals(info);
2593 s = info->signals;
2594
2595 events = mask &
2596 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2597 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2598 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2599 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2600 if (events) {
2601 spin_unlock_irqrestore(&info->lock,flags);
2602 goto exit;
2603 }
2604
2605 /* save current irq counts */
2606 cprev = info->icount;
2607 oldsigs = info->input_signal_events;
2608
2609 /* enable hunt and idle irqs if needed */
2610 if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
2611 unsigned short val = rd_reg16(info, SCR);
2612 if (!(val & IRQ_RXIDLE))
2613 wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE));
2614 }
2615
2616 set_current_state(TASK_INTERRUPTIBLE);
2617 add_wait_queue(&info->event_wait_q, &wait);
2618
2619 spin_unlock_irqrestore(&info->lock,flags);
2620
2621 for(;;) {
2622 schedule();
2623 if (signal_pending(current)) {
2624 rc = -ERESTARTSYS;
2625 break;
2626 }
2627
2628 /* get current irq counts */
2629 spin_lock_irqsave(&info->lock,flags);
2630 cnow = info->icount;
2631 newsigs = info->input_signal_events;
2632 set_current_state(TASK_INTERRUPTIBLE);
2633 spin_unlock_irqrestore(&info->lock,flags);
2634
2635 /* if no change, wait aborted for some reason */
2636 if (newsigs.dsr_up == oldsigs.dsr_up &&
2637 newsigs.dsr_down == oldsigs.dsr_down &&
2638 newsigs.dcd_up == oldsigs.dcd_up &&
2639 newsigs.dcd_down == oldsigs.dcd_down &&
2640 newsigs.cts_up == oldsigs.cts_up &&
2641 newsigs.cts_down == oldsigs.cts_down &&
2642 newsigs.ri_up == oldsigs.ri_up &&
2643 newsigs.ri_down == oldsigs.ri_down &&
2644 cnow.exithunt == cprev.exithunt &&
2645 cnow.rxidle == cprev.rxidle) {
2646 rc = -EIO;
2647 break;
2648 }
2649
2650 events = mask &
2651 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2652 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2653 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2654 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2655 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2656 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2657 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2658 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2659 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2660 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2661 if (events)
2662 break;
2663
2664 cprev = cnow;
2665 oldsigs = newsigs;
2666 }
2667
2668 remove_wait_queue(&info->event_wait_q, &wait);
2669 set_current_state(TASK_RUNNING);
2670
2671
2672 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2673 spin_lock_irqsave(&info->lock,flags);
2674 if (!waitqueue_active(&info->event_wait_q)) {
2675 /* disable enable exit hunt mode/idle rcvd IRQs */
2676 wr_reg16(info, SCR,
2677 (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE));
2678 }
2679 spin_unlock_irqrestore(&info->lock,flags);
2680 }
2681exit:
2682 if (rc == 0)
2683 rc = put_user(events, mask_ptr);
2684 return rc;
2685}
2686
2687static int get_interface(struct slgt_info *info, int __user *if_mode)
2688{
2689 DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode));
2690 if (put_user(info->if_mode, if_mode))
2691 return -EFAULT;
2692 return 0;
2693}
2694
2695static int set_interface(struct slgt_info *info, int if_mode)
2696{
2697 unsigned long flags;
Paul Fulghum35fbd392006-01-18 17:42:24 -0800[diff] [blame]2698 unsigned short val;
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]2699
2700 DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode));
2701 spin_lock_irqsave(&info->lock,flags);
2702 info->if_mode = if_mode;
2703
2704 msc_set_vcr(info);
2705
2706 /* TCR (tx control) 07 1=RTS driver control */
2707 val = rd_reg16(info, TCR);
2708 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
2709 val |= BIT7;
2710 else
2711 val &= ~BIT7;
2712 wr_reg16(info, TCR, val);
2713
2714 spin_unlock_irqrestore(&info->lock,flags);
2715 return 0;
2716}
2717
Paul Fulghum0080b7a2006-03-28 01:56:15 -0800[diff] [blame]2718/*
2719 * set general purpose IO pin state and direction
2720 *
2721 * user_gpio fields:
2722 * state each bit indicates a pin state
2723 * smask set bit indicates pin state to set
2724 * dir each bit indicates a pin direction (0=input, 1=output)
2725 * dmask set bit indicates pin direction to set
2726 */
2727static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2728{
2729 unsigned long flags;
2730 struct gpio_desc gpio;
2731 __u32 data;
2732
2733 if (!info->gpio_present)
2734 return -EINVAL;
2735 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2736 return -EFAULT;
2737 DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n",
2738 info->device_name, gpio.state, gpio.smask,
2739 gpio.dir, gpio.dmask));
2740
2741 spin_lock_irqsave(&info->lock,flags);
2742 if (gpio.dmask) {
2743 data = rd_reg32(info, IODR);
2744 data |= gpio.dmask & gpio.dir;
2745 data &= ~(gpio.dmask & ~gpio.dir);
2746 wr_reg32(info, IODR, data);
2747 }
2748 if (gpio.smask) {
2749 data = rd_reg32(info, IOVR);
2750 data |= gpio.smask & gpio.state;
2751 data &= ~(gpio.smask & ~gpio.state);
2752 wr_reg32(info, IOVR, data);
2753 }
2754 spin_unlock_irqrestore(&info->lock,flags);
2755
2756 return 0;
2757}
2758
2759/*
2760 * get general purpose IO pin state and direction
2761 */
2762static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2763{
2764 struct gpio_desc gpio;
2765 if (!info->gpio_present)
2766 return -EINVAL;
2767 gpio.state = rd_reg32(info, IOVR);
2768 gpio.smask = 0xffffffff;
2769 gpio.dir = rd_reg32(info, IODR);
2770 gpio.dmask = 0xffffffff;
2771 if (copy_to_user(user_gpio, &gpio, sizeof(gpio)))
2772 return -EFAULT;
2773 DBGINFO(("%s get_gpio state=%08x dir=%08x\n",
2774 info->device_name, gpio.state, gpio.dir));
2775 return 0;
2776}
2777
2778/*
2779 * conditional wait facility
2780 */
2781static void init_cond_wait(struct cond_wait *w, unsigned int data)
2782{
2783 init_waitqueue_head(&w->q);
2784 init_waitqueue_entry(&w->wait, current);
2785 w->data = data;
2786}
2787
2788static void add_cond_wait(struct cond_wait **head, struct cond_wait *w)
2789{
2790 set_current_state(TASK_INTERRUPTIBLE);
2791 add_wait_queue(&w->q, &w->wait);
2792 w->next = *head;
2793 *head = w;
2794}
2795
2796static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw)
2797{
2798 struct cond_wait *w, *prev;
2799 remove_wait_queue(&cw->q, &cw->wait);
2800 set_current_state(TASK_RUNNING);
2801 for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) {
2802 if (w == cw) {
2803 if (prev != NULL)
2804 prev->next = w->next;
2805 else
2806 *head = w->next;
2807 break;
2808 }
2809 }
2810}
2811
2812static void flush_cond_wait(struct cond_wait **head)
2813{
2814 while (*head != NULL) {
2815 wake_up_interruptible(&(*head)->q);
2816 *head = (*head)->next;
2817 }
2818}
2819
2820/*
2821 * wait for general purpose I/O pin(s) to enter specified state
2822 *
2823 * user_gpio fields:
2824 * state - bit indicates target pin state
2825 * smask - set bit indicates watched pin
2826 *
2827 * The wait ends when at least one watched pin enters the specified
2828 * state. When 0 (no error) is returned, user_gpio->state is set to the
2829 * state of all GPIO pins when the wait ends.
2830 *
2831 * Note: Each pin may be a dedicated input, dedicated output, or
2832 * configurable input/output. The number and configuration of pins
2833 * varies with the specific adapter model. Only input pins (dedicated
2834 * or configured) can be monitored with this function.
2835 */
2836static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2837{
2838 unsigned long flags;
2839 int rc = 0;
2840 struct gpio_desc gpio;
2841 struct cond_wait wait;
2842 u32 state;
2843
2844 if (!info->gpio_present)
2845 return -EINVAL;
2846 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2847 return -EFAULT;
2848 DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n",
2849 info->device_name, gpio.state, gpio.smask));
2850 /* ignore output pins identified by set IODR bit */
2851 if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0)
2852 return -EINVAL;
2853 init_cond_wait(&wait, gpio.smask);
2854
2855 spin_lock_irqsave(&info->lock, flags);
2856 /* enable interrupts for watched pins */
2857 wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask);
2858 /* get current pin states */
2859 state = rd_reg32(info, IOVR);
2860
2861 if (gpio.smask & ~(state ^ gpio.state)) {
2862 /* already in target state */
2863 gpio.state = state;
2864 } else {
2865 /* wait for target state */
2866 add_cond_wait(&info->gpio_wait_q, &wait);
2867 spin_unlock_irqrestore(&info->lock, flags);
2868 schedule();
2869 if (signal_pending(current))
2870 rc = -ERESTARTSYS;
2871 else
2872 gpio.state = wait.data;
2873 spin_lock_irqsave(&info->lock, flags);
2874 remove_cond_wait(&info->gpio_wait_q, &wait);
2875 }
2876
2877 /* disable all GPIO interrupts if no waiting processes */
2878 if (info->gpio_wait_q == NULL)
2879 wr_reg32(info, IOER, 0);
2880 spin_unlock_irqrestore(&info->lock,flags);
2881
2882 if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio)))
2883 rc = -EFAULT;
2884 return rc;
2885}
2886
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]2887static int modem_input_wait(struct slgt_info *info,int arg)
2888{
2889 unsigned long flags;
2890 int rc;
2891 struct mgsl_icount cprev, cnow;
2892 DECLARE_WAITQUEUE(wait, current);
2893
2894 /* save current irq counts */
2895 spin_lock_irqsave(&info->lock,flags);
2896 cprev = info->icount;
2897 add_wait_queue(&info->status_event_wait_q, &wait);
2898 set_current_state(TASK_INTERRUPTIBLE);
2899 spin_unlock_irqrestore(&info->lock,flags);
2900
2901 for(;;) {
2902 schedule();
2903 if (signal_pending(current)) {
2904 rc = -ERESTARTSYS;
2905 break;
2906 }
2907
2908 /* get new irq counts */
2909 spin_lock_irqsave(&info->lock,flags);
2910 cnow = info->icount;
2911 set_current_state(TASK_INTERRUPTIBLE);
2912 spin_unlock_irqrestore(&info->lock,flags);
2913
2914 /* if no change, wait aborted for some reason */
2915 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2916 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2917 rc = -EIO;
2918 break;
2919 }
2920
2921 /* check for change in caller specified modem input */
2922 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2923 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2924 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
2925 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2926 rc = 0;
2927 break;
2928 }
2929
2930 cprev = cnow;
2931 }
2932 remove_wait_queue(&info->status_event_wait_q, &wait);
2933 set_current_state(TASK_RUNNING);
2934 return rc;
2935}
2936
2937/*
2938 * return state of serial control and status signals
2939 */
2940static int tiocmget(struct tty_struct *tty, struct file *file)
2941{
2942 struct slgt_info *info = tty->driver_data;
2943 unsigned int result;
2944 unsigned long flags;
2945
2946 spin_lock_irqsave(&info->lock,flags);
2947 get_signals(info);
2948 spin_unlock_irqrestore(&info->lock,flags);
2949
2950 result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2951 ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2952 ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2953 ((info->signals & SerialSignal_RI) ? TIOCM_RNG:0) +
2954 ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2955 ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2956
2957 DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result));
2958 return result;
2959}
2960
2961/*
2962 * set modem control signals (DTR/RTS)
2963 *
2964 * cmd signal command: TIOCMBIS = set bit TIOCMBIC = clear bit
2965 * TIOCMSET = set/clear signal values
2966 * value bit mask for command
2967 */
2968static int tiocmset(struct tty_struct *tty, struct file *file,
2969 unsigned int set, unsigned int clear)
2970{
2971 struct slgt_info *info = tty->driver_data;
2972 unsigned long flags;
2973
2974 DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear));
2975
2976 if (set & TIOCM_RTS)
2977 info->signals |= SerialSignal_RTS;
2978 if (set & TIOCM_DTR)
2979 info->signals |= SerialSignal_DTR;
2980 if (clear & TIOCM_RTS)
2981 info->signals &= ~SerialSignal_RTS;
2982 if (clear & TIOCM_DTR)
2983 info->signals &= ~SerialSignal_DTR;
2984
2985 spin_lock_irqsave(&info->lock,flags);
2986 set_signals(info);
2987 spin_unlock_irqrestore(&info->lock,flags);
2988 return 0;
2989}
2990
2991/*
2992 * block current process until the device is ready to open
2993 */
2994static int block_til_ready(struct tty_struct *tty, struct file *filp,
2995 struct slgt_info *info)
2996{
2997 DECLARE_WAITQUEUE(wait, current);
2998 int retval;
2999 int do_clocal = 0, extra_count = 0;
3000 unsigned long flags;
3001
3002 DBGINFO(("%s block_til_ready\n", tty->driver->name));
3003
3004 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3005 /* nonblock mode is set or port is not enabled */
3006 info->flags |= ASYNC_NORMAL_ACTIVE;
3007 return 0;
3008 }
3009
3010 if (tty->termios->c_cflag & CLOCAL)
3011 do_clocal = 1;
3012
3013 /* Wait for carrier detect and the line to become
3014 * free (i.e., not in use by the callout). While we are in
3015 * this loop, info->count is dropped by one, so that
3016 * close() knows when to free things. We restore it upon
3017 * exit, either normal or abnormal.
3018 */
3019
3020 retval = 0;
3021 add_wait_queue(&info->open_wait, &wait);
3022
3023 spin_lock_irqsave(&info->lock, flags);
3024 if (!tty_hung_up_p(filp)) {
3025 extra_count = 1;
3026 info->count--;
3027 }
3028 spin_unlock_irqrestore(&info->lock, flags);
3029 info->blocked_open++;
3030
3031 while (1) {
3032 if ((tty->termios->c_cflag & CBAUD)) {
3033 spin_lock_irqsave(&info->lock,flags);
3034 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
3035 set_signals(info);
3036 spin_unlock_irqrestore(&info->lock,flags);
3037 }
3038
3039 set_current_state(TASK_INTERRUPTIBLE);
3040
3041 if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)){
3042 retval = (info->flags & ASYNC_HUP_NOTIFY) ?
3043 -EAGAIN : -ERESTARTSYS;
3044 break;
3045 }
3046
3047 spin_lock_irqsave(&info->lock,flags);
3048 get_signals(info);
3049 spin_unlock_irqrestore(&info->lock,flags);
3050
3051 if (!(info->flags & ASYNC_CLOSING) &&
3052 (do_clocal || (info->signals & SerialSignal_DCD)) ) {
3053 break;
3054 }
3055
3056 if (signal_pending(current)) {
3057 retval = -ERESTARTSYS;
3058 break;
3059 }
3060
3061 DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
3062 schedule();
3063 }
3064
3065 set_current_state(TASK_RUNNING);
3066 remove_wait_queue(&info->open_wait, &wait);
3067
3068 if (extra_count)
3069 info->count++;
3070 info->blocked_open--;
3071
3072 if (!retval)
3073 info->flags |= ASYNC_NORMAL_ACTIVE;
3074
3075 DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
3076 return retval;
3077}
3078
3079static int alloc_tmp_rbuf(struct slgt_info *info)
3080{
Paul Fulghum04b374d2006-06-25 05:49:21 -0700[diff] [blame]3081 info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL);
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]3082 if (info->tmp_rbuf == NULL)
3083 return -ENOMEM;
3084 return 0;
3085}
3086
3087static void free_tmp_rbuf(struct slgt_info *info)
3088{
3089 kfree(info->tmp_rbuf);
3090 info->tmp_rbuf = NULL;
3091}
3092
3093/*
3094 * allocate DMA descriptor lists.
3095 */
3096static int alloc_desc(struct slgt_info *info)
3097{
3098 unsigned int i;
3099 unsigned int pbufs;
3100
3101 /* allocate memory to hold descriptor lists */
3102 info->bufs = pci_alloc_consistent(info->pdev, DESC_LIST_SIZE, &info->bufs_dma_addr);
3103 if (info->bufs == NULL)
3104 return -ENOMEM;
3105
3106 memset(info->bufs, 0, DESC_LIST_SIZE);
3107
3108 info->rbufs = (struct slgt_desc*)info->bufs;
3109 info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count;
3110
3111 pbufs = (unsigned int)info->bufs_dma_addr;
3112
3113 /*
3114 * Build circular lists of descriptors
3115 */
3116
3117 for (i=0; i < info->rbuf_count; i++) {
3118 /* physical address of this descriptor */
3119 info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc));
3120
3121 /* physical address of next descriptor */
3122 if (i == info->rbuf_count - 1)
3123 info->rbufs[i].next = cpu_to_le32(pbufs);
3124 else
3125 info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc)));
3126 set_desc_count(info->rbufs[i], DMABUFSIZE);
3127 }
3128
3129 for (i=0; i < info->tbuf_count; i++) {
3130 /* physical address of this descriptor */
3131 info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc));
3132
3133 /* physical address of next descriptor */
3134 if (i == info->tbuf_count - 1)
3135 info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc));
3136 else
3137 info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc)));
3138 }
3139
3140 return 0;
3141}
3142
3143static void free_desc(struct slgt_info *info)
3144{
3145 if (info->bufs != NULL) {
3146 pci_free_consistent(info->pdev, DESC_LIST_SIZE, info->bufs, info->bufs_dma_addr);
3147 info->bufs = NULL;
3148 info->rbufs = NULL;
3149 info->tbufs = NULL;
3150 }
3151}
3152
3153static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3154{
3155 int i;
3156 for (i=0; i < count; i++) {
3157 if ((bufs[i].buf = pci_alloc_consistent(info->pdev, DMABUFSIZE, &bufs[i].buf_dma_addr)) == NULL)
3158 return -ENOMEM;
3159 bufs[i].pbuf = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
3160 }
3161 return 0;
3162}
3163
3164static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3165{
3166 int i;
3167 for (i=0; i < count; i++) {
3168 if (bufs[i].buf == NULL)
3169 continue;
3170 pci_free_consistent(info->pdev, DMABUFSIZE, bufs[i].buf, bufs[i].buf_dma_addr);
3171 bufs[i].buf = NULL;
3172 }
3173}
3174
3175static int alloc_dma_bufs(struct slgt_info *info)
3176{
3177 info->rbuf_count = 32;
3178 info->tbuf_count = 32;
3179
3180 if (alloc_desc(info) < 0 ||
3181 alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 ||
3182 alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 ||
3183 alloc_tmp_rbuf(info) < 0) {
3184 DBGERR(("%s DMA buffer alloc fail\n", info->device_name));
3185 return -ENOMEM;
3186 }
3187 reset_rbufs(info);
3188 return 0;
3189}
3190
3191static void free_dma_bufs(struct slgt_info *info)
3192{
3193 if (info->bufs) {
3194 free_bufs(info, info->rbufs, info->rbuf_count);
3195 free_bufs(info, info->tbufs, info->tbuf_count);
3196 free_desc(info);
3197 }
3198 free_tmp_rbuf(info);
3199}
3200
3201static int claim_resources(struct slgt_info *info)
3202{
3203 if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) {
3204 DBGERR(("%s reg addr conflict, addr=%08X\n",
3205 info->device_name, info->phys_reg_addr));
3206 info->init_error = DiagStatus_AddressConflict;
3207 goto errout;
3208 }
3209 else
3210 info->reg_addr_requested = 1;
3211
Paul Fulghum0c8365e2006-01-11 12:17:39 -0800[diff] [blame]3212 info->reg_addr = ioremap(info->phys_reg_addr, SLGT_REG_SIZE);
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]3213 if (!info->reg_addr) {
3214 DBGERR(("%s cant map device registers, addr=%08X\n",
3215 info->device_name, info->phys_reg_addr));
3216 info->init_error = DiagStatus_CantAssignPciResources;
3217 goto errout;
3218 }
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]3219 return 0;
3220
3221errout:
3222 release_resources(info);
3223 return -ENODEV;
3224}
3225
3226static void release_resources(struct slgt_info *info)
3227{
3228 if (info->irq_requested) {
3229 free_irq(info->irq_level, info);
3230 info->irq_requested = 0;
3231 }
3232
3233 if (info->reg_addr_requested) {
3234 release_mem_region(info->phys_reg_addr, SLGT_REG_SIZE);
3235 info->reg_addr_requested = 0;
3236 }
3237
3238 if (info->reg_addr) {
Paul Fulghum0c8365e2006-01-11 12:17:39 -0800[diff] [blame]3239 iounmap(info->reg_addr);
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]3240 info->reg_addr = NULL;
3241 }
3242}
3243
3244/* Add the specified device instance data structure to the
3245 * global linked list of devices and increment the device count.
3246 */
3247static void add_device(struct slgt_info *info)
3248{
3249 char *devstr;
3250
3251 info->next_device = NULL;
3252 info->line = slgt_device_count;
3253 sprintf(info->device_name, "%s%d", tty_dev_prefix, info->line);
3254
3255 if (info->line < MAX_DEVICES) {
3256 if (maxframe[info->line])
3257 info->max_frame_size = maxframe[info->line];
3258 info->dosyncppp = dosyncppp[info->line];
3259 }
3260
3261 slgt_device_count++;
3262
3263 if (!slgt_device_list)
3264 slgt_device_list = info;
3265 else {
3266 struct slgt_info *current_dev = slgt_device_list;
3267 while(current_dev->next_device)
3268 current_dev = current_dev->next_device;
3269 current_dev->next_device = info;
3270 }
3271
3272 if (info->max_frame_size < 4096)
3273 info->max_frame_size = 4096;
3274 else if (info->max_frame_size > 65535)
3275 info->max_frame_size = 65535;
3276
3277 switch(info->pdev->device) {
3278 case SYNCLINK_GT_DEVICE_ID:
3279 devstr = "GT";
3280 break;
Paul Fulghum6f84be82006-06-25 05:49:22 -0700[diff] [blame^]3281 case SYNCLINK_GT2_DEVICE_ID:
3282 devstr = "GT2";
3283 break;
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]3284 case SYNCLINK_GT4_DEVICE_ID:
3285 devstr = "GT4";
3286 break;
3287 case SYNCLINK_AC_DEVICE_ID:
3288 devstr = "AC";
3289 info->params.mode = MGSL_MODE_ASYNC;
3290 break;
3291 default:
3292 devstr = "(unknown model)";
3293 }
3294 printk("SyncLink %s %s IO=%08x IRQ=%d MaxFrameSize=%u\n",
3295 devstr, info->device_name, info->phys_reg_addr,
3296 info->irq_level, info->max_frame_size);
3297
3298#ifdef CONFIG_HDLC
3299 hdlcdev_init(info);
3300#endif
3301}
3302
3303/*
3304 * allocate device instance structure, return NULL on failure
3305 */
3306static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3307{
3308 struct slgt_info *info;
3309
3310 info = kmalloc(sizeof(struct slgt_info), GFP_KERNEL);
3311
3312 if (!info) {
3313 DBGERR(("%s device alloc failed adapter=%d port=%d\n",
3314 driver_name, adapter_num, port_num));
3315 } else {
3316 memset(info, 0, sizeof(struct slgt_info));
3317 info->magic = MGSL_MAGIC;
3318 INIT_WORK(&info->task, bh_handler, info);
3319 info->max_frame_size = 4096;
3320 info->raw_rx_size = DMABUFSIZE;
3321 info->close_delay = 5*HZ/10;
3322 info->closing_wait = 30*HZ;
3323 init_waitqueue_head(&info->open_wait);
3324 init_waitqueue_head(&info->close_wait);
3325 init_waitqueue_head(&info->status_event_wait_q);
3326 init_waitqueue_head(&info->event_wait_q);
3327 spin_lock_init(&info->netlock);
3328 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3329 info->idle_mode = HDLC_TXIDLE_FLAGS;
3330 info->adapter_num = adapter_num;
3331 info->port_num = port_num;
3332
3333 init_timer(&info->tx_timer);
3334 info->tx_timer.data = (unsigned long)info;
3335 info->tx_timer.function = tx_timeout;
3336
3337 init_timer(&info->rx_timer);
3338 info->rx_timer.data = (unsigned long)info;
3339 info->rx_timer.function = rx_timeout;
3340
3341 /* Copy configuration info to device instance data */
3342 info->pdev = pdev;
3343 info->irq_level = pdev->irq;
3344 info->phys_reg_addr = pci_resource_start(pdev,0);
3345
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]3346 info->bus_type = MGSL_BUS_TYPE_PCI;
3347 info->irq_flags = SA_SHIRQ;
3348
3349 info->init_error = -1; /* assume error, set to 0 on successful init */
3350 }
3351
3352 return info;
3353}
3354
3355static void device_init(int adapter_num, struct pci_dev *pdev)
3356{
3357 struct slgt_info *port_array[SLGT_MAX_PORTS];
3358 int i;
3359 int port_count = 1;
3360
Paul Fulghum6f84be82006-06-25 05:49:22 -0700[diff] [blame^]3361 if (pdev->device == SYNCLINK_GT2_DEVICE_ID)
3362 port_count = 2;
3363 else if (pdev->device == SYNCLINK_GT4_DEVICE_ID)
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]3364 port_count = 4;
3365
3366 /* allocate device instances for all ports */
3367 for (i=0; i < port_count; ++i) {
3368 port_array[i] = alloc_dev(adapter_num, i, pdev);
3369 if (port_array[i] == NULL) {
3370 for (--i; i >= 0; --i)
3371 kfree(port_array[i]);
3372 return;
3373 }
3374 }
3375
3376 /* give copy of port_array to all ports and add to device list */
3377 for (i=0; i < port_count; ++i) {
3378 memcpy(port_array[i]->port_array, port_array, sizeof(port_array));
3379 add_device(port_array[i]);
3380 port_array[i]->port_count = port_count;
3381 spin_lock_init(&port_array[i]->lock);
3382 }
3383
3384 /* Allocate and claim adapter resources */
3385 if (!claim_resources(port_array[0])) {
3386
3387 alloc_dma_bufs(port_array[0]);
3388
3389 /* copy resource information from first port to others */
3390 for (i = 1; i < port_count; ++i) {
3391 port_array[i]->lock = port_array[0]->lock;
3392 port_array[i]->irq_level = port_array[0]->irq_level;
3393 port_array[i]->reg_addr = port_array[0]->reg_addr;
3394 alloc_dma_bufs(port_array[i]);
3395 }
3396
3397 if (request_irq(port_array[0]->irq_level,
3398 slgt_interrupt,
3399 port_array[0]->irq_flags,
3400 port_array[0]->device_name,
3401 port_array[0]) < 0) {
3402 DBGERR(("%s request_irq failed IRQ=%d\n",
3403 port_array[0]->device_name,
3404 port_array[0]->irq_level));
3405 } else {
3406 port_array[0]->irq_requested = 1;
3407 adapter_test(port_array[0]);
Paul Fulghum0080b7a2006-03-28 01:56:15 -0800[diff] [blame]3408 for (i=1 ; i < port_count ; i++) {
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]3409 port_array[i]->init_error = port_array[0]->init_error;
Paul Fulghum0080b7a2006-03-28 01:56:15 -0800[diff] [blame]3410 port_array[i]->gpio_present = port_array[0]->gpio_present;
3411 }
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]3412 }
3413 }
3414}
3415
3416static int __devinit init_one(struct pci_dev *dev,
3417 const struct pci_device_id *ent)
3418{
3419 if (pci_enable_device(dev)) {
3420 printk("error enabling pci device %p\n", dev);
3421 return -EIO;
3422 }
3423 pci_set_master(dev);
3424 device_init(slgt_device_count, dev);
3425 return 0;
3426}
3427
3428static void __devexit remove_one(struct pci_dev *dev)
3429{
3430}
3431
3432static struct tty_operations ops = {
3433 .open = open,
3434 .close = close,
3435 .write = write,
3436 .put_char = put_char,
3437 .flush_chars = flush_chars,
3438 .write_room = write_room,
3439 .chars_in_buffer = chars_in_buffer,
3440 .flush_buffer = flush_buffer,
3441 .ioctl = ioctl,
3442 .throttle = throttle,
3443 .unthrottle = unthrottle,
3444 .send_xchar = send_xchar,
3445 .break_ctl = set_break,
3446 .wait_until_sent = wait_until_sent,
3447 .read_proc = read_proc,
3448 .set_termios = set_termios,
3449 .stop = tx_hold,
3450 .start = tx_release,
3451 .hangup = hangup,
3452 .tiocmget = tiocmget,
3453 .tiocmset = tiocmset,
3454};
3455
3456static void slgt_cleanup(void)
3457{
3458 int rc;
3459 struct slgt_info *info;
3460 struct slgt_info *tmp;
3461
3462 printk("unload %s %s\n", driver_name, driver_version);
3463
3464 if (serial_driver) {
3465 if ((rc = tty_unregister_driver(serial_driver)))
3466 DBGERR(("tty_unregister_driver error=%d\n", rc));
3467 put_tty_driver(serial_driver);
3468 }
3469
3470 /* reset devices */
3471 info = slgt_device_list;
3472 while(info) {
3473 reset_port(info);
3474 info = info->next_device;
3475 }
3476
3477 /* release devices */
3478 info = slgt_device_list;
3479 while(info) {
3480#ifdef CONFIG_HDLC
3481 hdlcdev_exit(info);
3482#endif
3483 free_dma_bufs(info);
3484 free_tmp_rbuf(info);
3485 if (info->port_num == 0)
3486 release_resources(info);
3487 tmp = info;
3488 info = info->next_device;
3489 kfree(tmp);
3490 }
3491
3492 if (pci_registered)
3493 pci_unregister_driver(&pci_driver);
3494}
3495
3496/*
3497 * Driver initialization entry point.
3498 */
3499static int __init slgt_init(void)
3500{
3501 int rc;
3502
3503 printk("%s %s\n", driver_name, driver_version);
3504
3505 slgt_device_count = 0;
3506 if ((rc = pci_register_driver(&pci_driver)) < 0) {
3507 printk("%s pci_register_driver error=%d\n", driver_name, rc);
3508 return rc;
3509 }
3510 pci_registered = 1;
3511
3512 if (!slgt_device_list) {
3513 printk("%s no devices found\n",driver_name);
3514 return -ENODEV;
3515 }
3516
3517 serial_driver = alloc_tty_driver(MAX_DEVICES);
3518 if (!serial_driver) {
3519 rc = -ENOMEM;
3520 goto error;
3521 }
3522
3523 /* Initialize the tty_driver structure */
3524
3525 serial_driver->owner = THIS_MODULE;
3526 serial_driver->driver_name = tty_driver_name;
3527 serial_driver->name = tty_dev_prefix;
3528 serial_driver->major = ttymajor;
3529 serial_driver->minor_start = 64;
3530 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3531 serial_driver->subtype = SERIAL_TYPE_NORMAL;
3532 serial_driver->init_termios = tty_std_termios;
3533 serial_driver->init_termios.c_cflag =
3534 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3535 serial_driver->flags = TTY_DRIVER_REAL_RAW;
3536 tty_set_operations(serial_driver, &ops);
3537 if ((rc = tty_register_driver(serial_driver)) < 0) {
3538 DBGERR(("%s can't register serial driver\n", driver_name));
3539 put_tty_driver(serial_driver);
3540 serial_driver = NULL;
3541 goto error;
3542 }
3543
3544 printk("%s %s, tty major#%d\n",
3545 driver_name, driver_version,
3546 serial_driver->major);
3547
3548 return 0;
3549
3550error:
3551 slgt_cleanup();
3552 return rc;
3553}
3554
3555static void __exit slgt_exit(void)
3556{
3557 slgt_cleanup();
3558}
3559
3560module_init(slgt_init);
3561module_exit(slgt_exit);
3562
3563/*
3564 * register access routines
3565 */
3566
3567#define CALC_REGADDR() \
3568 unsigned long reg_addr = ((unsigned long)info->reg_addr) + addr; \
3569 if (addr >= 0x80) \
3570 reg_addr += (info->port_num) * 32;
3571
3572static __u8 rd_reg8(struct slgt_info *info, unsigned int addr)
3573{
3574 CALC_REGADDR();
3575 return readb((void __iomem *)reg_addr);
3576}
3577
3578static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value)
3579{
3580 CALC_REGADDR();
3581 writeb(value, (void __iomem *)reg_addr);
3582}
3583
3584static __u16 rd_reg16(struct slgt_info *info, unsigned int addr)
3585{
3586 CALC_REGADDR();
3587 return readw((void __iomem *)reg_addr);
3588}
3589
3590static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value)
3591{
3592 CALC_REGADDR();
3593 writew(value, (void __iomem *)reg_addr);
3594}
3595
3596static __u32 rd_reg32(struct slgt_info *info, unsigned int addr)
3597{
3598 CALC_REGADDR();
3599 return readl((void __iomem *)reg_addr);
3600}
3601
3602static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value)
3603{
3604 CALC_REGADDR();
3605 writel(value, (void __iomem *)reg_addr);
3606}
3607
3608static void rdma_reset(struct slgt_info *info)
3609{
3610 unsigned int i;
3611
3612 /* set reset bit */
3613 wr_reg32(info, RDCSR, BIT1);
3614
3615 /* wait for enable bit cleared */
3616 for(i=0 ; i < 1000 ; i++)
3617 if (!(rd_reg32(info, RDCSR) & BIT0))
3618 break;
3619}
3620
3621static void tdma_reset(struct slgt_info *info)
3622{
3623 unsigned int i;
3624
3625 /* set reset bit */
3626 wr_reg32(info, TDCSR, BIT1);
3627
3628 /* wait for enable bit cleared */
3629 for(i=0 ; i < 1000 ; i++)
3630 if (!(rd_reg32(info, TDCSR) & BIT0))
3631 break;
3632}
3633
3634/*
3635 * enable internal loopback
3636 * TxCLK and RxCLK are generated from BRG
3637 * and TxD is looped back to RxD internally.
3638 */
3639static void enable_loopback(struct slgt_info *info)
3640{
3641 /* SCR (serial control) BIT2=looopback enable */
3642 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2));
3643
3644 if (info->params.mode != MGSL_MODE_ASYNC) {
3645 /* CCR (clock control)
3646 * 07..05 tx clock source (010 = BRG)
3647 * 04..02 rx clock source (010 = BRG)
3648 * 01 auxclk enable (0 = disable)
3649 * 00 BRG enable (1 = enable)
3650 *
3651 * 0100 1001
3652 */
3653 wr_reg8(info, CCR, 0x49);
3654
3655 /* set speed if available, otherwise use default */
3656 if (info->params.clock_speed)
3657 set_rate(info, info->params.clock_speed);
3658 else
3659 set_rate(info, 3686400);
3660 }
3661}
3662
3663/*
3664 * set baud rate generator to specified rate
3665 */
3666static void set_rate(struct slgt_info *info, u32 rate)
3667{
3668 unsigned int div;
3669 static unsigned int osc = 14745600;
3670
3671 /* div = osc/rate - 1
3672 *
3673 * Round div up if osc/rate is not integer to
3674 * force to next slowest rate.
3675 */
3676
3677 if (rate) {
3678 div = osc/rate;
3679 if (!(osc % rate) && div)
3680 div--;
3681 wr_reg16(info, BDR, (unsigned short)div);
3682 }
3683}
3684
3685static void rx_stop(struct slgt_info *info)
3686{
3687 unsigned short val;
3688
3689 /* disable and reset receiver */
3690 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3691 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3692 wr_reg16(info, RCR, val); /* clear reset bit */
3693
3694 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA + IRQ_RXIDLE);
3695
3696 /* clear pending rx interrupts */
3697 wr_reg16(info, SSR, IRQ_RXIDLE + IRQ_RXOVER);
3698
3699 rdma_reset(info);
3700
3701 info->rx_enabled = 0;
3702 info->rx_restart = 0;
3703}
3704
3705static void rx_start(struct slgt_info *info)
3706{
3707 unsigned short val;
3708
3709 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA);
3710
3711 /* clear pending rx overrun IRQ */
3712 wr_reg16(info, SSR, IRQ_RXOVER);
3713
3714 /* reset and disable receiver */
3715 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3716 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3717 wr_reg16(info, RCR, val); /* clear reset bit */
3718
3719 rdma_reset(info);
3720 reset_rbufs(info);
3721
3722 /* set 1st descriptor address */
3723 wr_reg32(info, RDDAR, info->rbufs[0].pdesc);
3724
3725 if (info->params.mode != MGSL_MODE_ASYNC) {
3726 /* enable rx DMA and DMA interrupt */
3727 wr_reg32(info, RDCSR, (BIT2 + BIT0));
3728 } else {
3729 /* enable saving of rx status, rx DMA and DMA interrupt */
3730 wr_reg32(info, RDCSR, (BIT6 + BIT2 + BIT0));
3731 }
3732
3733 slgt_irq_on(info, IRQ_RXOVER);
3734
3735 /* enable receiver */
3736 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | BIT1));
3737
3738 info->rx_restart = 0;
3739 info->rx_enabled = 1;
3740}
3741
3742static void tx_start(struct slgt_info *info)
3743{
3744 if (!info->tx_enabled) {
3745 wr_reg16(info, TCR,
3746 (unsigned short)(rd_reg16(info, TCR) | BIT1));
3747 info->tx_enabled = TRUE;
3748 }
3749
3750 if (info->tx_count) {
3751 info->drop_rts_on_tx_done = 0;
3752
3753 if (info->params.mode != MGSL_MODE_ASYNC) {
3754 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3755 get_signals(info);
3756 if (!(info->signals & SerialSignal_RTS)) {
3757 info->signals |= SerialSignal_RTS;
3758 set_signals(info);
3759 info->drop_rts_on_tx_done = 1;
3760 }
3761 }
3762
3763 slgt_irq_off(info, IRQ_TXDATA);
3764 slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE);
3765 /* clear tx idle and underrun status bits */
3766 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
3767
3768 if (!(rd_reg32(info, TDCSR) & BIT0)) {
3769 /* tx DMA stopped, restart tx DMA */
3770 tdma_reset(info);
3771 /* set 1st descriptor address */
3772 wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
3773 if (info->params.mode == MGSL_MODE_RAW)
3774 wr_reg32(info, TDCSR, BIT2 + BIT0); /* IRQ + DMA enable */
3775 else
3776 wr_reg32(info, TDCSR, BIT0); /* DMA enable */
3777 }
3778
3779 if (info->params.mode != MGSL_MODE_RAW) {
3780 info->tx_timer.expires = jiffies + msecs_to_jiffies(5000);
3781 add_timer(&info->tx_timer);
3782 }
3783 } else {
3784 tdma_reset(info);
3785 /* set 1st descriptor address */
3786 wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
3787
3788 slgt_irq_off(info, IRQ_TXDATA);
3789 slgt_irq_on(info, IRQ_TXIDLE);
3790 /* clear tx idle status bit */
3791 wr_reg16(info, SSR, IRQ_TXIDLE);
3792
3793 /* enable tx DMA */
3794 wr_reg32(info, TDCSR, BIT0);
3795 }
3796
3797 info->tx_active = 1;
3798 }
3799}
3800
3801static void tx_stop(struct slgt_info *info)
3802{
3803 unsigned short val;
3804
3805 del_timer(&info->tx_timer);
3806
3807 tdma_reset(info);
3808
3809 /* reset and disable transmitter */
3810 val = rd_reg16(info, TCR) & ~BIT1; /* clear enable bit */
3811 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
3812 wr_reg16(info, TCR, val); /* clear reset */
3813
3814 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
3815
3816 /* clear tx idle and underrun status bit */
3817 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
3818
3819 reset_tbufs(info);
3820
3821 info->tx_enabled = 0;
3822 info->tx_active = 0;
3823}
3824
3825static void reset_port(struct slgt_info *info)
3826{
3827 if (!info->reg_addr)
3828 return;
3829
3830 tx_stop(info);
3831 rx_stop(info);
3832
3833 info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
3834 set_signals(info);
3835
3836 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
3837}
3838
3839static void reset_adapter(struct slgt_info *info)
3840{
3841 int i;
3842 for (i=0; i < info->port_count; ++i) {
3843 if (info->port_array[i])
3844 reset_port(info->port_array[i]);
3845 }
3846}
3847
3848static void async_mode(struct slgt_info *info)
3849{
3850 unsigned short val;
3851
3852 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
3853 tx_stop(info);
3854 rx_stop(info);
3855
3856 /* TCR (tx control)
3857 *
3858 * 15..13 mode, 010=async
3859 * 12..10 encoding, 000=NRZ
3860 * 09 parity enable
3861 * 08 1=odd parity, 0=even parity
3862 * 07 1=RTS driver control
3863 * 06 1=break enable
3864 * 05..04 character length
3865 * 00=5 bits
3866 * 01=6 bits
3867 * 10=7 bits
3868 * 11=8 bits
3869 * 03 0=1 stop bit, 1=2 stop bits
3870 * 02 reset
3871 * 01 enable
3872 * 00 auto-CTS enable
3873 */
3874 val = 0x4000;
3875
3876 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
3877 val |= BIT7;
3878
3879 if (info->params.parity != ASYNC_PARITY_NONE) {
3880 val |= BIT9;
3881 if (info->params.parity == ASYNC_PARITY_ODD)
3882 val |= BIT8;
3883 }
3884
3885 switch (info->params.data_bits)
3886 {
3887 case 6: val |= BIT4; break;
3888 case 7: val |= BIT5; break;
3889 case 8: val |= BIT5 + BIT4; break;
3890 }
3891
3892 if (info->params.stop_bits != 1)
3893 val |= BIT3;
3894
3895 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3896 val |= BIT0;
3897
3898 wr_reg16(info, TCR, val);
3899
3900 /* RCR (rx control)
3901 *
3902 * 15..13 mode, 010=async
3903 * 12..10 encoding, 000=NRZ
3904 * 09 parity enable
3905 * 08 1=odd parity, 0=even parity
3906 * 07..06 reserved, must be 0
3907 * 05..04 character length
3908 * 00=5 bits
3909 * 01=6 bits
3910 * 10=7 bits
3911 * 11=8 bits
3912 * 03 reserved, must be zero
3913 * 02 reset
3914 * 01 enable
3915 * 00 auto-DCD enable
3916 */
3917 val = 0x4000;
3918
3919 if (info->params.parity != ASYNC_PARITY_NONE) {
3920 val |= BIT9;
3921 if (info->params.parity == ASYNC_PARITY_ODD)
3922 val |= BIT8;
3923 }
3924
3925 switch (info->params.data_bits)
3926 {
3927 case 6: val |= BIT4; break;
3928 case 7: val |= BIT5; break;
3929 case 8: val |= BIT5 + BIT4; break;
3930 }
3931
3932 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3933 val |= BIT0;
3934
3935 wr_reg16(info, RCR, val);
3936
3937 /* CCR (clock control)
3938 *
3939 * 07..05 011 = tx clock source is BRG/16
3940 * 04..02 010 = rx clock source is BRG
3941 * 01 0 = auxclk disabled
3942 * 00 1 = BRG enabled
3943 *
3944 * 0110 1001
3945 */
3946 wr_reg8(info, CCR, 0x69);
3947
3948 msc_set_vcr(info);
3949
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]3950 /* SCR (serial control)
3951 *
3952 * 15 1=tx req on FIFO half empty
3953 * 14 1=rx req on FIFO half full
3954 * 13 tx data IRQ enable
3955 * 12 tx idle IRQ enable
3956 * 11 rx break on IRQ enable
3957 * 10 rx data IRQ enable
3958 * 09 rx break off IRQ enable
3959 * 08 overrun IRQ enable
3960 * 07 DSR IRQ enable
3961 * 06 CTS IRQ enable
3962 * 05 DCD IRQ enable
3963 * 04 RI IRQ enable
3964 * 03 reserved, must be zero
3965 * 02 1=txd->rxd internal loopback enable
3966 * 01 reserved, must be zero
3967 * 00 1=master IRQ enable
3968 */
3969 val = BIT15 + BIT14 + BIT0;
3970 wr_reg16(info, SCR, val);
3971
3972 slgt_irq_on(info, IRQ_RXBREAK | IRQ_RXOVER);
3973
3974 set_rate(info, info->params.data_rate * 16);
3975
3976 if (info->params.loopback)
3977 enable_loopback(info);
3978}
3979
3980static void hdlc_mode(struct slgt_info *info)
3981{
3982 unsigned short val;
3983
3984 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
3985 tx_stop(info);
3986 rx_stop(info);
3987
3988 /* TCR (tx control)
3989 *
3990 * 15..13 mode, 000=HDLC 001=raw sync
3991 * 12..10 encoding
3992 * 09 CRC enable
3993 * 08 CRC32
3994 * 07 1=RTS driver control
3995 * 06 preamble enable
3996 * 05..04 preamble length
3997 * 03 share open/close flag
3998 * 02 reset
3999 * 01 enable
4000 * 00 auto-CTS enable
4001 */
4002 val = 0;
4003
4004 if (info->params.mode == MGSL_MODE_RAW)
4005 val |= BIT13;
4006 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4007 val |= BIT7;
4008
4009 switch(info->params.encoding)
4010 {
4011 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4012 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4013 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4014 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4015 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4016 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4017 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4018 }
4019
Paul Fulghum04b374d2006-06-25 05:49:21 -0700[diff] [blame]4020 switch (info->params.crc_type & HDLC_CRC_MASK)
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]4021 {
4022 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4023 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4024 }
4025
4026 if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
4027 val |= BIT6;
4028
4029 switch (info->params.preamble_length)
4030 {
4031 case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT5; break;
4032 case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT4; break;
4033 case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT5 + BIT4; break;
4034 }
4035
4036 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4037 val |= BIT0;
4038
4039 wr_reg16(info, TCR, val);
4040
4041 /* TPR (transmit preamble) */
4042
4043 switch (info->params.preamble)
4044 {
4045 case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
4046 case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break;
4047 case HDLC_PREAMBLE_PATTERN_ZEROS: val = 0x00; break;
4048 case HDLC_PREAMBLE_PATTERN_10: val = 0x55; break;
4049 case HDLC_PREAMBLE_PATTERN_01: val = 0xaa; break;
4050 default: val = 0x7e; break;
4051 }
4052 wr_reg8(info, TPR, (unsigned char)val);
4053
4054 /* RCR (rx control)
4055 *
4056 * 15..13 mode, 000=HDLC 001=raw sync
4057 * 12..10 encoding
4058 * 09 CRC enable
4059 * 08 CRC32
4060 * 07..03 reserved, must be 0
4061 * 02 reset
4062 * 01 enable
4063 * 00 auto-DCD enable
4064 */
4065 val = 0;
4066
4067 if (info->params.mode == MGSL_MODE_RAW)
4068 val |= BIT13;
4069
4070 switch(info->params.encoding)
4071 {
4072 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4073 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4074 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4075 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4076 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4077 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4078 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4079 }
4080
Paul Fulghum04b374d2006-06-25 05:49:21 -0700[diff] [blame]4081 switch (info->params.crc_type & HDLC_CRC_MASK)
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]4082 {
4083 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4084 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4085 }
4086
4087 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4088 val |= BIT0;
4089
4090 wr_reg16(info, RCR, val);
4091
4092 /* CCR (clock control)
4093 *
4094 * 07..05 tx clock source
4095 * 04..02 rx clock source
4096 * 01 auxclk enable
4097 * 00 BRG enable
4098 */
4099 val = 0;
4100
4101 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4102 {
4103 // when RxC source is DPLL, BRG generates 16X DPLL
4104 // reference clock, so take TxC from BRG/16 to get
4105 // transmit clock at actual data rate
4106 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4107 val |= BIT6 + BIT5; /* 011, txclk = BRG/16 */
4108 else
4109 val |= BIT6; /* 010, txclk = BRG */
4110 }
4111 else if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4112 val |= BIT7; /* 100, txclk = DPLL Input */
4113 else if (info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4114 val |= BIT5; /* 001, txclk = RXC Input */
4115
4116 if (info->params.flags & HDLC_FLAG_RXC_BRG)
4117 val |= BIT3; /* 010, rxclk = BRG */
4118 else if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4119 val |= BIT4; /* 100, rxclk = DPLL */
4120 else if (info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4121 val |= BIT2; /* 001, rxclk = TXC Input */
4122
4123 if (info->params.clock_speed)
4124 val |= BIT1 + BIT0;
4125
4126 wr_reg8(info, CCR, (unsigned char)val);
4127
4128 if (info->params.flags & (HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL))
4129 {
4130 // program DPLL mode
4131 switch(info->params.encoding)
4132 {
4133 case HDLC_ENCODING_BIPHASE_MARK:
4134 case HDLC_ENCODING_BIPHASE_SPACE:
4135 val = BIT7; break;
4136 case HDLC_ENCODING_BIPHASE_LEVEL:
4137 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:
4138 val = BIT7 + BIT6; break;
4139 default: val = BIT6; // NRZ encodings
4140 }
4141 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | val));
4142
4143 // DPLL requires a 16X reference clock from BRG
4144 set_rate(info, info->params.clock_speed * 16);
4145 }
4146 else
4147 set_rate(info, info->params.clock_speed);
4148
4149 tx_set_idle(info);
4150
4151 msc_set_vcr(info);
4152
4153 /* SCR (serial control)
4154 *
4155 * 15 1=tx req on FIFO half empty
4156 * 14 1=rx req on FIFO half full
4157 * 13 tx data IRQ enable
4158 * 12 tx idle IRQ enable
4159 * 11 underrun IRQ enable
4160 * 10 rx data IRQ enable
4161 * 09 rx idle IRQ enable
4162 * 08 overrun IRQ enable
4163 * 07 DSR IRQ enable
4164 * 06 CTS IRQ enable
4165 * 05 DCD IRQ enable
4166 * 04 RI IRQ enable
4167 * 03 reserved, must be zero
4168 * 02 1=txd->rxd internal loopback enable
4169 * 01 reserved, must be zero
4170 * 00 1=master IRQ enable
4171 */
4172 wr_reg16(info, SCR, BIT15 + BIT14 + BIT0);
4173
4174 if (info->params.loopback)
4175 enable_loopback(info);
4176}
4177
4178/*
4179 * set transmit idle mode
4180 */
4181static void tx_set_idle(struct slgt_info *info)
4182{
Paul Fulghum643f3312006-06-25 05:49:20 -0700[diff] [blame]4183 unsigned char val;
4184 unsigned short tcr;
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]4185
Paul Fulghum643f3312006-06-25 05:49:20 -0700[diff] [blame]4186 /* if preamble enabled (tcr[6] == 1) then tx idle size = 8 bits
4187 * else tcr[5:4] = tx idle size: 00 = 8 bits, 01 = 16 bits
4188 */
4189 tcr = rd_reg16(info, TCR);
4190 if (info->idle_mode & HDLC_TXIDLE_CUSTOM_16) {
4191 /* disable preamble, set idle size to 16 bits */
4192 tcr = (tcr & ~(BIT6 + BIT5)) | BIT4;
4193 /* MSB of 16 bit idle specified in tx preamble register (TPR) */
4194 wr_reg8(info, TPR, (unsigned char)((info->idle_mode >> 8) & 0xff));
4195 } else if (!(tcr & BIT6)) {
4196 /* preamble is disabled, set idle size to 8 bits */
4197 tcr &= ~(BIT5 + BIT4);
4198 }
4199 wr_reg16(info, TCR, tcr);
4200
4201 if (info->idle_mode & (HDLC_TXIDLE_CUSTOM_8 | HDLC_TXIDLE_CUSTOM_16)) {
4202 /* LSB of custom tx idle specified in tx idle register */
4203 val = (unsigned char)(info->idle_mode & 0xff);
4204 } else {
4205 /* standard 8 bit idle patterns */
4206 switch(info->idle_mode)
4207 {
4208 case HDLC_TXIDLE_FLAGS: val = 0x7e; break;
4209 case HDLC_TXIDLE_ALT_ZEROS_ONES:
4210 case HDLC_TXIDLE_ALT_MARK_SPACE: val = 0xaa; break;
4211 case HDLC_TXIDLE_ZEROS:
4212 case HDLC_TXIDLE_SPACE: val = 0x00; break;
4213 default: val = 0xff;
4214 }
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]4215 }
4216
4217 wr_reg8(info, TIR, val);
4218}
4219
4220/*
4221 * get state of V24 status (input) signals
4222 */
4223static void get_signals(struct slgt_info *info)
4224{
4225 unsigned short status = rd_reg16(info, SSR);
4226
4227 /* clear all serial signals except DTR and RTS */
4228 info->signals &= SerialSignal_DTR + SerialSignal_RTS;
4229
4230 if (status & BIT3)
4231 info->signals |= SerialSignal_DSR;
4232 if (status & BIT2)
4233 info->signals |= SerialSignal_CTS;
4234 if (status & BIT1)
4235 info->signals |= SerialSignal_DCD;
4236 if (status & BIT0)
4237 info->signals |= SerialSignal_RI;
4238}
4239
4240/*
4241 * set V.24 Control Register based on current configuration
4242 */
4243static void msc_set_vcr(struct slgt_info *info)
4244{
4245 unsigned char val = 0;
4246
4247 /* VCR (V.24 control)
4248 *
4249 * 07..04 serial IF select
4250 * 03 DTR
4251 * 02 RTS
4252 * 01 LL
4253 * 00 RL
4254 */
4255
4256 switch(info->if_mode & MGSL_INTERFACE_MASK)
4257 {
4258 case MGSL_INTERFACE_RS232:
4259 val |= BIT5; /* 0010 */
4260 break;
4261 case MGSL_INTERFACE_V35:
4262 val |= BIT7 + BIT6 + BIT5; /* 1110 */
4263 break;
4264 case MGSL_INTERFACE_RS422:
4265 val |= BIT6; /* 0100 */
4266 break;
4267 }
4268
4269 if (info->signals & SerialSignal_DTR)
4270 val |= BIT3;
4271 if (info->signals & SerialSignal_RTS)
4272 val |= BIT2;
4273 if (info->if_mode & MGSL_INTERFACE_LL)
4274 val |= BIT1;
4275 if (info->if_mode & MGSL_INTERFACE_RL)
4276 val |= BIT0;
4277 wr_reg8(info, VCR, val);
4278}
4279
4280/*
4281 * set state of V24 control (output) signals
4282 */
4283static void set_signals(struct slgt_info *info)
4284{
4285 unsigned char val = rd_reg8(info, VCR);
4286 if (info->signals & SerialSignal_DTR)
4287 val |= BIT3;
4288 else
4289 val &= ~BIT3;
4290 if (info->signals & SerialSignal_RTS)
4291 val |= BIT2;
4292 else
4293 val &= ~BIT2;
4294 wr_reg8(info, VCR, val);
4295}
4296
4297/*
4298 * free range of receive DMA buffers (i to last)
4299 */
4300static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last)
4301{
4302 int done = 0;
4303
4304 while(!done) {
4305 /* reset current buffer for reuse */
4306 info->rbufs[i].status = 0;
4307 if (info->params.mode == MGSL_MODE_RAW)
4308 set_desc_count(info->rbufs[i], info->raw_rx_size);
4309 else
4310 set_desc_count(info->rbufs[i], DMABUFSIZE);
4311
4312 if (i == last)
4313 done = 1;
4314 if (++i == info->rbuf_count)
4315 i = 0;
4316 }
4317 info->rbuf_current = i;
4318}
4319
4320/*
4321 * mark all receive DMA buffers as free
4322 */
4323static void reset_rbufs(struct slgt_info *info)
4324{
4325 free_rbufs(info, 0, info->rbuf_count - 1);
4326}
4327
4328/*
4329 * pass receive HDLC frame to upper layer
4330 *
4331 * return 1 if frame available, otherwise 0
4332 */
4333static int rx_get_frame(struct slgt_info *info)
4334{
4335 unsigned int start, end;
4336 unsigned short status;
4337 unsigned int framesize = 0;
4338 int rc = 0;
4339 unsigned long flags;
4340 struct tty_struct *tty = info->tty;
4341 unsigned char addr_field = 0xff;
Paul Fulghum04b374d2006-06-25 05:49:21 -0700[diff] [blame]4342 unsigned int crc_size = 0;
4343
4344 switch (info->params.crc_type & HDLC_CRC_MASK) {
4345 case HDLC_CRC_16_CCITT: crc_size = 2; break;
4346 case HDLC_CRC_32_CCITT: crc_size = 4; break;
4347 }
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]4348
4349check_again:
4350
4351 framesize = 0;
4352 addr_field = 0xff;
4353 start = end = info->rbuf_current;
4354
4355 for (;;) {
4356 if (!desc_complete(info->rbufs[end]))
4357 goto cleanup;
4358
4359 if (framesize == 0 && info->params.addr_filter != 0xff)
4360 addr_field = info->rbufs[end].buf[0];
4361
4362 framesize += desc_count(info->rbufs[end]);
4363
4364 if (desc_eof(info->rbufs[end]))
4365 break;
4366
4367 if (++end == info->rbuf_count)
4368 end = 0;
4369
4370 if (end == info->rbuf_current) {
4371 if (info->rx_enabled){
4372 spin_lock_irqsave(&info->lock,flags);
4373 rx_start(info);
4374 spin_unlock_irqrestore(&info->lock,flags);
4375 }
4376 goto cleanup;
4377 }
4378 }
4379
4380 /* status
4381 *
4382 * 15 buffer complete
4383 * 14..06 reserved
4384 * 05..04 residue
4385 * 02 eof (end of frame)
4386 * 01 CRC error
4387 * 00 abort
4388 */
4389 status = desc_status(info->rbufs[end]);
4390
4391 /* ignore CRC bit if not using CRC (bit is undefined) */
Paul Fulghum04b374d2006-06-25 05:49:21 -0700[diff] [blame]4392 if ((info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_NONE)
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]4393 status &= ~BIT1;
4394
4395 if (framesize == 0 ||
4396 (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4397 free_rbufs(info, start, end);
4398 goto check_again;
4399 }
4400
Paul Fulghum04b374d2006-06-25 05:49:21 -0700[diff] [blame]4401 if (framesize < (2 + crc_size) || status & BIT0) {
4402 info->icount.rxshort++;
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]4403 framesize = 0;
Paul Fulghum04b374d2006-06-25 05:49:21 -0700[diff] [blame]4404 } else if (status & BIT1) {
4405 info->icount.rxcrc++;
4406 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX))
4407 framesize = 0;
4408 }
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]4409
4410#ifdef CONFIG_HDLC
Paul Fulghum04b374d2006-06-25 05:49:21 -0700[diff] [blame]4411 if (framesize == 0) {
4412 struct net_device_stats *stats = hdlc_stats(info->netdev);
4413 stats->rx_errors++;
4414 stats->rx_frame_errors++;
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]4415 }
Paul Fulghum04b374d2006-06-25 05:49:21 -0700[diff] [blame]4416#endif
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]4417
4418 DBGBH(("%s rx frame status=%04X size=%d\n",
4419 info->device_name, status, framesize));
4420 DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, DMABUFSIZE), "rx");
4421
4422 if (framesize) {
Paul Fulghum04b374d2006-06-25 05:49:21 -0700[diff] [blame]4423 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) {
4424 framesize -= crc_size;
4425 crc_size = 0;
4426 }
4427
4428 if (framesize > info->max_frame_size + crc_size)
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]4429 info->icount.rxlong++;
4430 else {
4431 /* copy dma buffer(s) to contiguous temp buffer */
4432 int copy_count = framesize;
4433 int i = start;
4434 unsigned char *p = info->tmp_rbuf;
4435 info->tmp_rbuf_count = framesize;
4436
4437 info->icount.rxok++;
4438
4439 while(copy_count) {
4440 int partial_count = min(copy_count, DMABUFSIZE);
4441 memcpy(p, info->rbufs[i].buf, partial_count);
4442 p += partial_count;
4443 copy_count -= partial_count;
4444 if (++i == info->rbuf_count)
4445 i = 0;
4446 }
4447
Paul Fulghum04b374d2006-06-25 05:49:21 -0700[diff] [blame]4448 if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
4449 *p = (status & BIT1) ? RX_CRC_ERROR : RX_OK;
4450 framesize++;
4451 }
4452
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]4453#ifdef CONFIG_HDLC
4454 if (info->netcount)
4455 hdlcdev_rx(info,info->tmp_rbuf, framesize);
4456 else
4457#endif
4458 ldisc_receive_buf(tty, info->tmp_rbuf, info->flag_buf, framesize);
4459 }
4460 }
4461 free_rbufs(info, start, end);
4462 rc = 1;
4463
4464cleanup:
4465 return rc;
4466}
4467
4468/*
4469 * pass receive buffer (RAW synchronous mode) to tty layer
4470 * return 1 if buffer available, otherwise 0
4471 */
4472static int rx_get_buf(struct slgt_info *info)
4473{
4474 unsigned int i = info->rbuf_current;
4475
4476 if (!desc_complete(info->rbufs[i]))
4477 return 0;
4478 DBGDATA(info, info->rbufs[i].buf, desc_count(info->rbufs[i]), "rx");
4479 DBGINFO(("rx_get_buf size=%d\n", desc_count(info->rbufs[i])));
4480 ldisc_receive_buf(info->tty, info->rbufs[i].buf,
4481 info->flag_buf, desc_count(info->rbufs[i]));
4482 free_rbufs(info, i, i);
4483 return 1;
4484}
4485
4486static void reset_tbufs(struct slgt_info *info)
4487{
4488 unsigned int i;
4489 info->tbuf_current = 0;
4490 for (i=0 ; i < info->tbuf_count ; i++) {
4491 info->tbufs[i].status = 0;
4492 info->tbufs[i].count = 0;
4493 }
4494}
4495
4496/*
4497 * return number of free transmit DMA buffers
4498 */
4499static unsigned int free_tbuf_count(struct slgt_info *info)
4500{
4501 unsigned int count = 0;
4502 unsigned int i = info->tbuf_current;
4503
4504 do
4505 {
4506 if (desc_count(info->tbufs[i]))
4507 break; /* buffer in use */
4508 ++count;
4509 if (++i == info->tbuf_count)
4510 i=0;
4511 } while (i != info->tbuf_current);
4512
4513 /* last buffer with zero count may be in use, assume it is */
4514 if (count)
4515 --count;
4516
4517 return count;
4518}
4519
4520/*
4521 * load transmit DMA buffer(s) with data
4522 */
4523static void tx_load(struct slgt_info *info, const char *buf, unsigned int size)
4524{
4525 unsigned short count;
4526 unsigned int i;
4527 struct slgt_desc *d;
4528
4529 if (size == 0)
4530 return;
4531
4532 DBGDATA(info, buf, size, "tx");
4533
4534 info->tbuf_start = i = info->tbuf_current;
4535
4536 while (size) {
4537 d = &info->tbufs[i];
4538 if (++i == info->tbuf_count)
4539 i = 0;
4540
4541 count = (unsigned short)((size > DMABUFSIZE) ? DMABUFSIZE : size);
4542 memcpy(d->buf, buf, count);
4543
4544 size -= count;
4545 buf += count;
4546
4547 if (!size && info->params.mode != MGSL_MODE_RAW)
4548 set_desc_eof(*d, 1); /* HDLC: set EOF of last desc */
4549 else
4550 set_desc_eof(*d, 0);
4551
4552 set_desc_count(*d, count);
4553 }
4554
4555 info->tbuf_current = i;
4556}
4557
4558static int register_test(struct slgt_info *info)
4559{
4560 static unsigned short patterns[] =
4561 {0x0000, 0xffff, 0xaaaa, 0x5555, 0x6969, 0x9696};
4562 static unsigned int count = sizeof(patterns)/sizeof(patterns[0]);
4563 unsigned int i;
4564 int rc = 0;
4565
4566 for (i=0 ; i < count ; i++) {
4567 wr_reg16(info, TIR, patterns[i]);
4568 wr_reg16(info, BDR, patterns[(i+1)%count]);
4569 if ((rd_reg16(info, TIR) != patterns[i]) ||
4570 (rd_reg16(info, BDR) != patterns[(i+1)%count])) {
4571 rc = -ENODEV;
4572 break;
4573 }
4574 }
Paul Fulghum0080b7a2006-03-28 01:56:15 -0800[diff] [blame]4575 info->gpio_present = (rd_reg32(info, JCR) & BIT5) ? 1 : 0;
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]4576 info->init_error = rc ? 0 : DiagStatus_AddressFailure;
4577 return rc;
4578}
4579
4580static int irq_test(struct slgt_info *info)
4581{
4582 unsigned long timeout;
4583 unsigned long flags;
4584 struct tty_struct *oldtty = info->tty;
4585 u32 speed = info->params.data_rate;
4586
4587 info->params.data_rate = 921600;
4588 info->tty = NULL;
4589
4590 spin_lock_irqsave(&info->lock, flags);
4591 async_mode(info);
4592 slgt_irq_on(info, IRQ_TXIDLE);
4593
4594 /* enable transmitter */
4595 wr_reg16(info, TCR,
4596 (unsigned short)(rd_reg16(info, TCR) | BIT1));
4597
4598 /* write one byte and wait for tx idle */
4599 wr_reg16(info, TDR, 0);
4600
4601 /* assume failure */
4602 info->init_error = DiagStatus_IrqFailure;
4603 info->irq_occurred = FALSE;
4604
4605 spin_unlock_irqrestore(&info->lock, flags);
4606
4607 timeout=100;
4608 while(timeout-- && !info->irq_occurred)
4609 msleep_interruptible(10);
4610
4611 spin_lock_irqsave(&info->lock,flags);
4612 reset_port(info);
4613 spin_unlock_irqrestore(&info->lock,flags);
4614
4615 info->params.data_rate = speed;
4616 info->tty = oldtty;
4617
4618 info->init_error = info->irq_occurred ? 0 : DiagStatus_IrqFailure;
4619 return info->irq_occurred ? 0 : -ENODEV;
4620}
4621
4622static int loopback_test_rx(struct slgt_info *info)
4623{
4624 unsigned char *src, *dest;
4625 int count;
4626
4627 if (desc_complete(info->rbufs[0])) {
4628 count = desc_count(info->rbufs[0]);
4629 src = info->rbufs[0].buf;
4630 dest = info->tmp_rbuf;
4631
4632 for( ; count ; count-=2, src+=2) {
4633 /* src=data byte (src+1)=status byte */
4634 if (!(*(src+1) & (BIT9 + BIT8))) {
4635 *dest = *src;
4636 dest++;
4637 info->tmp_rbuf_count++;
4638 }
4639 }
4640 DBGDATA(info, info->tmp_rbuf, info->tmp_rbuf_count, "rx");
4641 return 1;
4642 }
4643 return 0;
4644}
4645
4646static int loopback_test(struct slgt_info *info)
4647{
4648#define TESTFRAMESIZE 20
4649
4650 unsigned long timeout;
4651 u16 count = TESTFRAMESIZE;
4652 unsigned char buf[TESTFRAMESIZE];
4653 int rc = -ENODEV;
4654 unsigned long flags;
4655
4656 struct tty_struct *oldtty = info->tty;
4657 MGSL_PARAMS params;
4658
4659 memcpy(&params, &info->params, sizeof(params));
4660
4661 info->params.mode = MGSL_MODE_ASYNC;
4662 info->params.data_rate = 921600;
4663 info->params.loopback = 1;
4664 info->tty = NULL;
4665
4666 /* build and send transmit frame */
4667 for (count = 0; count < TESTFRAMESIZE; ++count)
4668 buf[count] = (unsigned char)count;
4669
4670 info->tmp_rbuf_count = 0;
4671 memset(info->tmp_rbuf, 0, TESTFRAMESIZE);
4672
4673 /* program hardware for HDLC and enabled receiver */
4674 spin_lock_irqsave(&info->lock,flags);
4675 async_mode(info);
4676 rx_start(info);
4677 info->tx_count = count;
4678 tx_load(info, buf, count);
4679 tx_start(info);
4680 spin_unlock_irqrestore(&info->lock, flags);
4681
4682 /* wait for receive complete */
4683 for (timeout = 100; timeout; --timeout) {
4684 msleep_interruptible(10);
4685 if (loopback_test_rx(info)) {
4686 rc = 0;
4687 break;
4688 }
4689 }
4690
4691 /* verify received frame length and contents */
4692 if (!rc && (info->tmp_rbuf_count != count ||
4693 memcmp(buf, info->tmp_rbuf, count))) {
4694 rc = -ENODEV;
4695 }
4696
4697 spin_lock_irqsave(&info->lock,flags);
4698 reset_adapter(info);
4699 spin_unlock_irqrestore(&info->lock,flags);
4700
4701 memcpy(&info->params, &params, sizeof(info->params));
4702 info->tty = oldtty;
4703
4704 info->init_error = rc ? DiagStatus_DmaFailure : 0;
4705 return rc;
4706}
4707
4708static int adapter_test(struct slgt_info *info)
4709{
4710 DBGINFO(("testing %s\n", info->device_name));
Paul Fulghum294dad02006-06-25 05:49:21 -0700[diff] [blame]4711 if (register_test(info) < 0) {
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]4712 printk("register test failure %s addr=%08X\n",
4713 info->device_name, info->phys_reg_addr);
Paul Fulghum294dad02006-06-25 05:49:21 -0700[diff] [blame]4714 } else if (irq_test(info) < 0) {
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]4715 printk("IRQ test failure %s IRQ=%d\n",
4716 info->device_name, info->irq_level);
Paul Fulghum294dad02006-06-25 05:49:21 -0700[diff] [blame]4717 } else if (loopback_test(info) < 0) {
Paul Fulghum705b6c72006-01-08 01:02:06 -0800[diff] [blame]4718 printk("loopback test failure %s\n", info->device_name);
4719 }
4720 return info->init_error;
4721}
4722
4723/*
4724 * transmit timeout handler
4725 */
4726static void tx_timeout(unsigned long context)
4727{
4728 struct slgt_info *info = (struct slgt_info*)context;
4729 unsigned long flags;
4730
4731 DBGINFO(("%s tx_timeout\n", info->device_name));
4732 if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
4733 info->icount.txtimeout++;
4734 }
4735 spin_lock_irqsave(&info->lock,flags);
4736 info->tx_active = 0;
4737 info->tx_count = 0;
4738 spin_unlock_irqrestore(&info->lock,flags);
4739
4740#ifdef CONFIG_HDLC
4741 if (info->netcount)
4742 hdlcdev_tx_done(info);
4743 else
4744#endif
4745 bh_transmit(info);
4746}
4747
4748/*
4749 * receive buffer polling timer
4750 */
4751static void rx_timeout(unsigned long context)
4752{
4753 struct slgt_info *info = (struct slgt_info*)context;
4754 unsigned long flags;
4755
4756 DBGINFO(("%s rx_timeout\n", info->device_name));
4757 spin_lock_irqsave(&info->lock, flags);
4758 info->pending_bh |= BH_RECEIVE;
4759 spin_unlock_irqrestore(&info->lock, flags);
4760 bh_handler(info);
4761}
4762