blob: db2ae71d07ef08511f480c5f6b7978b68772daaa [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * PowerMac G5 SMU driver
3 *
4 * Copyright 2004 J. Mayer <l_indien@magic.fr>
5 * Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
6 *
7 * Released under the term of the GNU GPL v2.
8 */
9
10/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 * TODO:
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070012 * - maybe add timeout to commands ?
13 * - blocking version of time functions
14 * - polling version of i2c commands (including timer that works with
15 * interrutps off)
16 * - maybe avoid some data copies with i2c by directly using the smu cmd
17 * buffer and a lower level internal interface
18 * - understand SMU -> CPU events and implement reception of them via
19 * the userland interface
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 */
21
22#include <linux/config.h>
23#include <linux/types.h>
24#include <linux/kernel.h>
25#include <linux/device.h>
26#include <linux/dmapool.h>
27#include <linux/bootmem.h>
28#include <linux/vmalloc.h>
29#include <linux/highmem.h>
30#include <linux/jiffies.h>
31#include <linux/interrupt.h>
32#include <linux/rtc.h>
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070033#include <linux/completion.h>
34#include <linux/miscdevice.h>
35#include <linux/delay.h>
36#include <linux/sysdev.h>
37#include <linux/poll.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#include <asm/byteorder.h>
40#include <asm/io.h>
41#include <asm/prom.h>
42#include <asm/machdep.h>
43#include <asm/pmac_feature.h>
44#include <asm/smu.h>
45#include <asm/sections.h>
46#include <asm/abs_addr.h>
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070047#include <asm/uaccess.h>
48#include <asm/of_device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +110050#define VERSION "0.7"
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070051#define AUTHOR "(c) 2005 Benjamin Herrenschmidt, IBM Corp."
52
53#undef DEBUG_SMU
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
55#ifdef DEBUG_SMU
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +110056#define DPRINTK(fmt, args...) do { printk(KERN_DEBUG fmt , ##args); } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070057#else
58#define DPRINTK(fmt, args...) do { } while (0)
59#endif
60
61/*
62 * This is the command buffer passed to the SMU hardware
63 */
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070064#define SMU_MAX_DATA 254
65
Linus Torvalds1da177e2005-04-16 15:20:36 -070066struct smu_cmd_buf {
67 u8 cmd;
68 u8 length;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070069 u8 data[SMU_MAX_DATA];
Linus Torvalds1da177e2005-04-16 15:20:36 -070070};
71
72struct smu_device {
73 spinlock_t lock;
74 struct device_node *of_node;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070075 struct of_device *of_dev;
76 int doorbell; /* doorbell gpio */
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 u32 __iomem *db_buf; /* doorbell buffer */
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070078 int db_irq;
79 int msg;
80 int msg_irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 struct smu_cmd_buf *cmd_buf; /* command buffer virtual */
82 u32 cmd_buf_abs; /* command buffer absolute */
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070083 struct list_head cmd_list;
84 struct smu_cmd *cmd_cur; /* pending command */
85 struct list_head cmd_i2c_list;
86 struct smu_i2c_cmd *cmd_i2c_cur; /* pending i2c command */
87 struct timer_list i2c_timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088};
89
90/*
91 * I don't think there will ever be more than one SMU, so
92 * for now, just hard code that
93 */
94static struct smu_device *smu;
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +110095static DECLARE_MUTEX(smu_part_access);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -070096
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +110097static void smu_i2c_retry(unsigned long data);
98
Linus Torvalds1da177e2005-04-16 15:20:36 -070099/*
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700100 * SMU driver low level stuff
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700103static void smu_start_cmd(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700105 unsigned long faddr, fend;
106 struct smu_cmd *cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700108 if (list_empty(&smu->cmd_list))
109 return;
110
111 /* Fetch first command in queue */
112 cmd = list_entry(smu->cmd_list.next, struct smu_cmd, link);
113 smu->cmd_cur = cmd;
114 list_del(&cmd->link);
115
116 DPRINTK("SMU: starting cmd %x, %d bytes data\n", cmd->cmd,
117 cmd->data_len);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100118 DPRINTK("SMU: data buffer: %02x %02x %02x %02x %02x %02x %02x %02x\n",
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700119 ((u8 *)cmd->data_buf)[0], ((u8 *)cmd->data_buf)[1],
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100120 ((u8 *)cmd->data_buf)[2], ((u8 *)cmd->data_buf)[3],
121 ((u8 *)cmd->data_buf)[4], ((u8 *)cmd->data_buf)[5],
122 ((u8 *)cmd->data_buf)[6], ((u8 *)cmd->data_buf)[7]);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700123
124 /* Fill the SMU command buffer */
125 smu->cmd_buf->cmd = cmd->cmd;
126 smu->cmd_buf->length = cmd->data_len;
127 memcpy(smu->cmd_buf->data, cmd->data_buf, cmd->data_len);
128
129 /* Flush command and data to RAM */
130 faddr = (unsigned long)smu->cmd_buf;
131 fend = faddr + smu->cmd_buf->length + 2;
132 flush_inval_dcache_range(faddr, fend);
133
134 /* This isn't exactly a DMA mapping here, I suspect
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 * the SMU is actually communicating with us via i2c to the
136 * northbridge or the CPU to access RAM.
137 */
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700138 writel(smu->cmd_buf_abs, smu->db_buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
140 /* Ring the SMU doorbell */
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700141 pmac_do_feature_call(PMAC_FTR_WRITE_GPIO, NULL, smu->doorbell, 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142}
143
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700144
145static irqreturn_t smu_db_intr(int irq, void *arg, struct pt_regs *regs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700147 unsigned long flags;
148 struct smu_cmd *cmd;
149 void (*done)(struct smu_cmd *cmd, void *misc) = NULL;
150 void *misc = NULL;
151 u8 gpio;
152 int rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700154 /* SMU completed the command, well, we hope, let's make sure
155 * of it
156 */
157 spin_lock_irqsave(&smu->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700159 gpio = pmac_do_feature_call(PMAC_FTR_READ_GPIO, NULL, smu->doorbell);
Benjamin Herrenschmidta44fe132005-09-30 08:25:17 +1000160 if ((gpio & 7) != 7) {
161 spin_unlock_irqrestore(&smu->lock, flags);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700162 return IRQ_HANDLED;
Benjamin Herrenschmidta44fe132005-09-30 08:25:17 +1000163 }
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700164
165 cmd = smu->cmd_cur;
166 smu->cmd_cur = NULL;
167 if (cmd == NULL)
168 goto bail;
169
170 if (rc == 0) {
171 unsigned long faddr;
172 int reply_len;
173 u8 ack;
174
175 /* CPU might have brought back the cache line, so we need
176 * to flush again before peeking at the SMU response. We
177 * flush the entire buffer for now as we haven't read the
178 * reply lenght (it's only 2 cache lines anyway)
179 */
180 faddr = (unsigned long)smu->cmd_buf;
181 flush_inval_dcache_range(faddr, faddr + 256);
182
183 /* Now check ack */
184 ack = (~cmd->cmd) & 0xff;
185 if (ack != smu->cmd_buf->cmd) {
186 DPRINTK("SMU: incorrect ack, want %x got %x\n",
187 ack, smu->cmd_buf->cmd);
188 rc = -EIO;
189 }
190 reply_len = rc == 0 ? smu->cmd_buf->length : 0;
191 DPRINTK("SMU: reply len: %d\n", reply_len);
192 if (reply_len > cmd->reply_len) {
193 printk(KERN_WARNING "SMU: reply buffer too small,"
194 "got %d bytes for a %d bytes buffer\n",
195 reply_len, cmd->reply_len);
196 reply_len = cmd->reply_len;
197 }
198 cmd->reply_len = reply_len;
199 if (cmd->reply_buf && reply_len)
200 memcpy(cmd->reply_buf, smu->cmd_buf->data, reply_len);
201 }
202
203 /* Now complete the command. Write status last in order as we lost
204 * ownership of the command structure as soon as it's no longer -1
205 */
206 done = cmd->done;
207 misc = cmd->misc;
208 mb();
209 cmd->status = rc;
210 bail:
211 /* Start next command if any */
212 smu_start_cmd();
213 spin_unlock_irqrestore(&smu->lock, flags);
214
215 /* Call command completion handler if any */
216 if (done)
217 done(cmd, misc);
218
219 /* It's an edge interrupt, nothing to do */
220 return IRQ_HANDLED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221}
222
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700223
224static irqreturn_t smu_msg_intr(int irq, void *arg, struct pt_regs *regs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700226 /* I don't quite know what to do with this one, we seem to never
227 * receive it, so I suspect we have to arm it someway in the SMU
228 * to start getting events that way.
229 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700231 printk(KERN_INFO "SMU: message interrupt !\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700233 /* It's an edge interrupt, nothing to do */
234 return IRQ_HANDLED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235}
236
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700237
238/*
239 * Queued command management.
240 *
241 */
242
243int smu_queue_cmd(struct smu_cmd *cmd)
244{
245 unsigned long flags;
246
247 if (smu == NULL)
248 return -ENODEV;
249 if (cmd->data_len > SMU_MAX_DATA ||
250 cmd->reply_len > SMU_MAX_DATA)
251 return -EINVAL;
252
253 cmd->status = 1;
254 spin_lock_irqsave(&smu->lock, flags);
255 list_add_tail(&cmd->link, &smu->cmd_list);
256 if (smu->cmd_cur == NULL)
257 smu_start_cmd();
258 spin_unlock_irqrestore(&smu->lock, flags);
259
260 return 0;
261}
262EXPORT_SYMBOL(smu_queue_cmd);
263
264
265int smu_queue_simple(struct smu_simple_cmd *scmd, u8 command,
266 unsigned int data_len,
267 void (*done)(struct smu_cmd *cmd, void *misc),
268 void *misc, ...)
269{
270 struct smu_cmd *cmd = &scmd->cmd;
271 va_list list;
272 int i;
273
274 if (data_len > sizeof(scmd->buffer))
275 return -EINVAL;
276
277 memset(scmd, 0, sizeof(*scmd));
278 cmd->cmd = command;
279 cmd->data_len = data_len;
280 cmd->data_buf = scmd->buffer;
281 cmd->reply_len = sizeof(scmd->buffer);
282 cmd->reply_buf = scmd->buffer;
283 cmd->done = done;
284 cmd->misc = misc;
285
286 va_start(list, misc);
287 for (i = 0; i < data_len; ++i)
288 scmd->buffer[i] = (u8)va_arg(list, int);
289 va_end(list);
290
291 return smu_queue_cmd(cmd);
292}
293EXPORT_SYMBOL(smu_queue_simple);
294
295
296void smu_poll(void)
297{
298 u8 gpio;
299
300 if (smu == NULL)
301 return;
302
303 gpio = pmac_do_feature_call(PMAC_FTR_READ_GPIO, NULL, smu->doorbell);
304 if ((gpio & 7) == 7)
305 smu_db_intr(smu->db_irq, smu, NULL);
306}
307EXPORT_SYMBOL(smu_poll);
308
309
310void smu_done_complete(struct smu_cmd *cmd, void *misc)
311{
312 struct completion *comp = misc;
313
314 complete(comp);
315}
316EXPORT_SYMBOL(smu_done_complete);
317
318
319void smu_spinwait_cmd(struct smu_cmd *cmd)
320{
321 while(cmd->status == 1)
322 smu_poll();
323}
324EXPORT_SYMBOL(smu_spinwait_cmd);
325
326
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327/* RTC low level commands */
328static inline int bcd2hex (int n)
329{
330 return (((n & 0xf0) >> 4) * 10) + (n & 0xf);
331}
332
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700333
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334static inline int hex2bcd (int n)
335{
336 return ((n / 10) << 4) + (n % 10);
337}
338
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
340static inline void smu_fill_set_rtc_cmd(struct smu_cmd_buf *cmd_buf,
341 struct rtc_time *time)
342{
343 cmd_buf->cmd = 0x8e;
344 cmd_buf->length = 8;
345 cmd_buf->data[0] = 0x80;
346 cmd_buf->data[1] = hex2bcd(time->tm_sec);
347 cmd_buf->data[2] = hex2bcd(time->tm_min);
348 cmd_buf->data[3] = hex2bcd(time->tm_hour);
349 cmd_buf->data[4] = time->tm_wday;
350 cmd_buf->data[5] = hex2bcd(time->tm_mday);
351 cmd_buf->data[6] = hex2bcd(time->tm_mon) + 1;
352 cmd_buf->data[7] = hex2bcd(time->tm_year - 100);
353}
354
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700356int smu_get_rtc_time(struct rtc_time *time, int spinwait)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700358 struct smu_simple_cmd cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 int rc;
360
361 if (smu == NULL)
362 return -ENODEV;
363
364 memset(time, 0, sizeof(struct rtc_time));
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700365 rc = smu_queue_simple(&cmd, SMU_CMD_RTC_COMMAND, 1, NULL, NULL,
366 SMU_CMD_RTC_GET_DATETIME);
367 if (rc)
368 return rc;
369 smu_spinwait_simple(&cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700371 time->tm_sec = bcd2hex(cmd.buffer[0]);
372 time->tm_min = bcd2hex(cmd.buffer[1]);
373 time->tm_hour = bcd2hex(cmd.buffer[2]);
374 time->tm_wday = bcd2hex(cmd.buffer[3]);
375 time->tm_mday = bcd2hex(cmd.buffer[4]);
376 time->tm_mon = bcd2hex(cmd.buffer[5]) - 1;
377 time->tm_year = bcd2hex(cmd.buffer[6]) + 100;
378
379 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380}
381
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700382
383int smu_set_rtc_time(struct rtc_time *time, int spinwait)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700385 struct smu_simple_cmd cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 int rc;
387
388 if (smu == NULL)
389 return -ENODEV;
390
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700391 rc = smu_queue_simple(&cmd, SMU_CMD_RTC_COMMAND, 8, NULL, NULL,
392 SMU_CMD_RTC_SET_DATETIME,
393 hex2bcd(time->tm_sec),
394 hex2bcd(time->tm_min),
395 hex2bcd(time->tm_hour),
396 time->tm_wday,
397 hex2bcd(time->tm_mday),
398 hex2bcd(time->tm_mon) + 1,
399 hex2bcd(time->tm_year - 100));
400 if (rc)
401 return rc;
402 smu_spinwait_simple(&cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700404 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405}
406
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700407
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408void smu_shutdown(void)
409{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700410 struct smu_simple_cmd cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411
412 if (smu == NULL)
413 return;
414
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700415 if (smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 9, NULL, NULL,
416 'S', 'H', 'U', 'T', 'D', 'O', 'W', 'N', 0))
417 return;
418 smu_spinwait_simple(&cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 for (;;)
420 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421}
422
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700423
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424void smu_restart(void)
425{
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700426 struct smu_simple_cmd cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
428 if (smu == NULL)
429 return;
430
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700431 if (smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 8, NULL, NULL,
432 'R', 'E', 'S', 'T', 'A', 'R', 'T', 0))
433 return;
434 smu_spinwait_simple(&cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 for (;;)
436 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437}
438
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700439
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440int smu_present(void)
441{
442 return smu != NULL;
443}
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700444EXPORT_SYMBOL(smu_present);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445
446
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100447int __init smu_init (void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448{
449 struct device_node *np;
450 u32 *data;
451
452 np = of_find_node_by_type(NULL, "smu");
453 if (np == NULL)
454 return -ENODEV;
455
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700456 printk(KERN_INFO "SMU driver %s %s\n", VERSION, AUTHOR);
457
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 if (smu_cmdbuf_abs == 0) {
459 printk(KERN_ERR "SMU: Command buffer not allocated !\n");
460 return -EINVAL;
461 }
462
463 smu = alloc_bootmem(sizeof(struct smu_device));
464 if (smu == NULL)
465 return -ENOMEM;
466 memset(smu, 0, sizeof(*smu));
467
468 spin_lock_init(&smu->lock);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700469 INIT_LIST_HEAD(&smu->cmd_list);
470 INIT_LIST_HEAD(&smu->cmd_i2c_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 smu->of_node = np;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700472 smu->db_irq = NO_IRQ;
473 smu->msg_irq = NO_IRQ;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700474
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 /* smu_cmdbuf_abs is in the low 2G of RAM, can be converted to a
476 * 32 bits value safely
477 */
478 smu->cmd_buf_abs = (u32)smu_cmdbuf_abs;
479 smu->cmd_buf = (struct smu_cmd_buf *)abs_to_virt(smu_cmdbuf_abs);
480
481 np = of_find_node_by_name(NULL, "smu-doorbell");
482 if (np == NULL) {
483 printk(KERN_ERR "SMU: Can't find doorbell GPIO !\n");
484 goto fail;
485 }
486 data = (u32 *)get_property(np, "reg", NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 if (data == NULL) {
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700488 of_node_put(np);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 printk(KERN_ERR "SMU: Can't find doorbell GPIO address !\n");
490 goto fail;
491 }
492
493 /* Current setup has one doorbell GPIO that does both doorbell
494 * and ack. GPIOs are at 0x50, best would be to find that out
495 * in the device-tree though.
496 */
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700497 smu->doorbell = *data;
498 if (smu->doorbell < 0x50)
499 smu->doorbell += 0x50;
500 if (np->n_intrs > 0)
501 smu->db_irq = np->intrs[0].line;
502
503 of_node_put(np);
504
505 /* Now look for the smu-interrupt GPIO */
506 do {
507 np = of_find_node_by_name(NULL, "smu-interrupt");
508 if (np == NULL)
509 break;
510 data = (u32 *)get_property(np, "reg", NULL);
511 if (data == NULL) {
512 of_node_put(np);
513 break;
514 }
515 smu->msg = *data;
516 if (smu->msg < 0x50)
517 smu->msg += 0x50;
518 if (np->n_intrs > 0)
519 smu->msg_irq = np->intrs[0].line;
520 of_node_put(np);
521 } while(0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522
523 /* Doorbell buffer is currently hard-coded, I didn't find a proper
524 * device-tree entry giving the address. Best would probably to use
525 * an offset for K2 base though, but let's do it that way for now.
526 */
527 smu->db_buf = ioremap(0x8000860c, 0x1000);
528 if (smu->db_buf == NULL) {
529 printk(KERN_ERR "SMU: Can't map doorbell buffer pointer !\n");
530 goto fail;
531 }
532
533 sys_ctrler = SYS_CTRLER_SMU;
534 return 0;
535
536 fail:
537 smu = NULL;
538 return -ENXIO;
539
540}
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700541
542
543static int smu_late_init(void)
544{
545 if (!smu)
546 return 0;
547
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100548 init_timer(&smu->i2c_timer);
549 smu->i2c_timer.function = smu_i2c_retry;
550 smu->i2c_timer.data = (unsigned long)smu;
551
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700552 /*
553 * Try to request the interrupts
554 */
555
556 if (smu->db_irq != NO_IRQ) {
557 if (request_irq(smu->db_irq, smu_db_intr,
558 SA_SHIRQ, "SMU doorbell", smu) < 0) {
559 printk(KERN_WARNING "SMU: can't "
560 "request interrupt %d\n",
561 smu->db_irq);
562 smu->db_irq = NO_IRQ;
563 }
564 }
565
566 if (smu->msg_irq != NO_IRQ) {
567 if (request_irq(smu->msg_irq, smu_msg_intr,
568 SA_SHIRQ, "SMU message", smu) < 0) {
569 printk(KERN_WARNING "SMU: can't "
570 "request interrupt %d\n",
571 smu->msg_irq);
572 smu->msg_irq = NO_IRQ;
573 }
574 }
575
576 return 0;
577}
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100578/* This has to be before arch_initcall as the low i2c stuff relies on the
579 * above having been done before we reach arch_initcalls
580 */
581core_initcall(smu_late_init);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700582
583/*
584 * sysfs visibility
585 */
586
587static void smu_expose_childs(void *unused)
588{
Benjamin Herrenschmidta28d3af2006-01-07 11:35:26 +1100589 struct device_node *np;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700590
Benjamin Herrenschmidta28d3af2006-01-07 11:35:26 +1100591 for (np = NULL; (np = of_get_next_child(smu->of_node, np)) != NULL;)
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100592 if (device_is_compatible(np, "smu-sensors"))
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100593 of_platform_device_create(np, "smu-sensors",
594 &smu->of_dev->dev);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700595}
596
597static DECLARE_WORK(smu_expose_childs_work, smu_expose_childs, NULL);
598
599static int smu_platform_probe(struct of_device* dev,
600 const struct of_device_id *match)
601{
602 if (!smu)
603 return -ENODEV;
604 smu->of_dev = dev;
605
606 /*
607 * Ok, we are matched, now expose all i2c busses. We have to defer
608 * that unfortunately or it would deadlock inside the device model
609 */
610 schedule_work(&smu_expose_childs_work);
611
612 return 0;
613}
614
615static struct of_device_id smu_platform_match[] =
616{
617 {
618 .type = "smu",
619 },
620 {},
621};
622
623static struct of_platform_driver smu_of_platform_driver =
624{
625 .name = "smu",
626 .match_table = smu_platform_match,
627 .probe = smu_platform_probe,
628};
629
630static int __init smu_init_sysfs(void)
631{
632 int rc;
633
634 /*
635 * Due to sysfs bogosity, a sysdev is not a real device, so
636 * we should in fact create both if we want sysdev semantics
637 * for power management.
638 * For now, we don't power manage machines with an SMU chip,
639 * I'm a bit too far from figuring out how that works with those
640 * new chipsets, but that will come back and bite us
641 */
642 rc = of_register_driver(&smu_of_platform_driver);
643 return 0;
644}
645
646device_initcall(smu_init_sysfs);
647
648struct of_device *smu_get_ofdev(void)
649{
650 if (!smu)
651 return NULL;
652 return smu->of_dev;
653}
654
655EXPORT_SYMBOL_GPL(smu_get_ofdev);
656
657/*
658 * i2c interface
659 */
660
661static void smu_i2c_complete_command(struct smu_i2c_cmd *cmd, int fail)
662{
663 void (*done)(struct smu_i2c_cmd *cmd, void *misc) = cmd->done;
664 void *misc = cmd->misc;
665 unsigned long flags;
666
667 /* Check for read case */
668 if (!fail && cmd->read) {
669 if (cmd->pdata[0] < 1)
670 fail = 1;
671 else
672 memcpy(cmd->info.data, &cmd->pdata[1],
673 cmd->info.datalen);
674 }
675
676 DPRINTK("SMU: completing, success: %d\n", !fail);
677
678 /* Update status and mark no pending i2c command with lock
679 * held so nobody comes in while we dequeue an eventual
680 * pending next i2c command
681 */
682 spin_lock_irqsave(&smu->lock, flags);
683 smu->cmd_i2c_cur = NULL;
684 wmb();
685 cmd->status = fail ? -EIO : 0;
686
687 /* Is there another i2c command waiting ? */
688 if (!list_empty(&smu->cmd_i2c_list)) {
689 struct smu_i2c_cmd *newcmd;
690
691 /* Fetch it, new current, remove from list */
692 newcmd = list_entry(smu->cmd_i2c_list.next,
693 struct smu_i2c_cmd, link);
694 smu->cmd_i2c_cur = newcmd;
695 list_del(&cmd->link);
696
697 /* Queue with low level smu */
698 list_add_tail(&cmd->scmd.link, &smu->cmd_list);
699 if (smu->cmd_cur == NULL)
700 smu_start_cmd();
701 }
702 spin_unlock_irqrestore(&smu->lock, flags);
703
704 /* Call command completion handler if any */
705 if (done)
706 done(cmd, misc);
707
708}
709
710
711static void smu_i2c_retry(unsigned long data)
712{
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100713 struct smu_i2c_cmd *cmd = smu->cmd_i2c_cur;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700714
715 DPRINTK("SMU: i2c failure, requeuing...\n");
716
717 /* requeue command simply by resetting reply_len */
718 cmd->pdata[0] = 0xff;
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100719 cmd->scmd.reply_len = sizeof(cmd->pdata);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700720 smu_queue_cmd(&cmd->scmd);
721}
722
723
724static void smu_i2c_low_completion(struct smu_cmd *scmd, void *misc)
725{
726 struct smu_i2c_cmd *cmd = misc;
727 int fail = 0;
728
729 DPRINTK("SMU: i2c compl. stage=%d status=%x pdata[0]=%x rlen: %x\n",
730 cmd->stage, scmd->status, cmd->pdata[0], scmd->reply_len);
731
732 /* Check for possible status */
733 if (scmd->status < 0)
734 fail = 1;
735 else if (cmd->read) {
736 if (cmd->stage == 0)
737 fail = cmd->pdata[0] != 0;
738 else
739 fail = cmd->pdata[0] >= 0x80;
740 } else {
741 fail = cmd->pdata[0] != 0;
742 }
743
744 /* Handle failures by requeuing command, after 5ms interval
745 */
746 if (fail && --cmd->retries > 0) {
747 DPRINTK("SMU: i2c failure, starting timer...\n");
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100748 BUG_ON(cmd != smu->cmd_i2c_cur);
749 mod_timer(&smu->i2c_timer, jiffies + msecs_to_jiffies(5));
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700750 return;
751 }
752
753 /* If failure or stage 1, command is complete */
754 if (fail || cmd->stage != 0) {
755 smu_i2c_complete_command(cmd, fail);
756 return;
757 }
758
759 DPRINTK("SMU: going to stage 1\n");
760
761 /* Ok, initial command complete, now poll status */
762 scmd->reply_buf = cmd->pdata;
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100763 scmd->reply_len = sizeof(cmd->pdata);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700764 scmd->data_buf = cmd->pdata;
765 scmd->data_len = 1;
766 cmd->pdata[0] = 0;
767 cmd->stage = 1;
768 cmd->retries = 20;
769 smu_queue_cmd(scmd);
770}
771
772
773int smu_queue_i2c(struct smu_i2c_cmd *cmd)
774{
775 unsigned long flags;
776
777 if (smu == NULL)
778 return -ENODEV;
779
780 /* Fill most fields of scmd */
781 cmd->scmd.cmd = SMU_CMD_I2C_COMMAND;
782 cmd->scmd.done = smu_i2c_low_completion;
783 cmd->scmd.misc = cmd;
784 cmd->scmd.reply_buf = cmd->pdata;
Benjamin Herrenschmidt730745a2006-01-07 11:30:44 +1100785 cmd->scmd.reply_len = sizeof(cmd->pdata);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -0700786 cmd->scmd.data_buf = (u8 *)(char *)&cmd->info;
787 cmd->scmd.status = 1;
788 cmd->stage = 0;
789 cmd->pdata[0] = 0xff;
790 cmd->retries = 20;
791 cmd->status = 1;
792
793 /* Check transfer type, sanitize some "info" fields
794 * based on transfer type and do more checking
795 */
796 cmd->info.caddr = cmd->info.devaddr;
797 cmd->read = cmd->info.devaddr & 0x01;
798 switch(cmd->info.type) {
799 case SMU_I2C_TRANSFER_SIMPLE:
800 memset(&cmd->info.sublen, 0, 4);
801 break;
802 case SMU_I2C_TRANSFER_COMBINED:
803 cmd->info.devaddr &= 0xfe;
804 case SMU_I2C_TRANSFER_STDSUB:
805 if (cmd->info.sublen > 3)
806 return -EINVAL;
807 break;
808 default:
809 return -EINVAL;
810 }
811
812 /* Finish setting up command based on transfer direction
813 */
814 if (cmd->read) {
815 if (cmd->info.datalen > SMU_I2C_READ_MAX)
816 return -EINVAL;
817 memset(cmd->info.data, 0xff, cmd->info.datalen);
818 cmd->scmd.data_len = 9;
819 } else {
820 if (cmd->info.datalen > SMU_I2C_WRITE_MAX)
821 return -EINVAL;
822 cmd->scmd.data_len = 9 + cmd->info.datalen;
823 }
824
825 DPRINTK("SMU: i2c enqueuing command\n");
826 DPRINTK("SMU: %s, len=%d bus=%x addr=%x sub0=%x type=%x\n",
827 cmd->read ? "read" : "write", cmd->info.datalen,
828 cmd->info.bus, cmd->info.caddr,
829 cmd->info.subaddr[0], cmd->info.type);
830
831
832 /* Enqueue command in i2c list, and if empty, enqueue also in
833 * main command list
834 */
835 spin_lock_irqsave(&smu->lock, flags);
836 if (smu->cmd_i2c_cur == NULL) {
837 smu->cmd_i2c_cur = cmd;
838 list_add_tail(&cmd->scmd.link, &smu->cmd_list);
839 if (smu->cmd_cur == NULL)
840 smu_start_cmd();
841 } else
842 list_add_tail(&cmd->link, &smu->cmd_i2c_list);
843 spin_unlock_irqrestore(&smu->lock, flags);
844
845 return 0;
846}
847
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100848/*
849 * Handling of "partitions"
850 */
851
852static int smu_read_datablock(u8 *dest, unsigned int addr, unsigned int len)
853{
854 DECLARE_COMPLETION(comp);
855 unsigned int chunk;
856 struct smu_cmd cmd;
857 int rc;
858 u8 params[8];
859
860 /* We currently use a chunk size of 0xe. We could check the
861 * SMU firmware version and use bigger sizes though
862 */
863 chunk = 0xe;
864
865 while (len) {
866 unsigned int clen = min(len, chunk);
867
868 cmd.cmd = SMU_CMD_MISC_ee_COMMAND;
869 cmd.data_len = 7;
870 cmd.data_buf = params;
871 cmd.reply_len = chunk;
872 cmd.reply_buf = dest;
873 cmd.done = smu_done_complete;
874 cmd.misc = &comp;
875 params[0] = SMU_CMD_MISC_ee_GET_DATABLOCK_REC;
876 params[1] = 0x4;
877 *((u32 *)&params[2]) = addr;
878 params[6] = clen;
879
880 rc = smu_queue_cmd(&cmd);
881 if (rc)
882 return rc;
883 wait_for_completion(&comp);
884 if (cmd.status != 0)
885 return rc;
886 if (cmd.reply_len != clen) {
887 printk(KERN_DEBUG "SMU: short read in "
888 "smu_read_datablock, got: %d, want: %d\n",
889 cmd.reply_len, clen);
890 return -EIO;
891 }
892 len -= clen;
893 addr += clen;
894 dest += clen;
895 }
896 return 0;
897}
898
899static struct smu_sdbp_header *smu_create_sdb_partition(int id)
900{
901 DECLARE_COMPLETION(comp);
902 struct smu_simple_cmd cmd;
903 unsigned int addr, len, tlen;
904 struct smu_sdbp_header *hdr;
905 struct property *prop;
906
907 /* First query the partition info */
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +1100908 DPRINTK("SMU: Query partition infos ... (irq=%d)\n", smu->db_irq);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100909 smu_queue_simple(&cmd, SMU_CMD_PARTITION_COMMAND, 2,
910 smu_done_complete, &comp,
911 SMU_CMD_PARTITION_LATEST, id);
912 wait_for_completion(&comp);
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +1100913 DPRINTK("SMU: done, status: %d, reply_len: %d\n",
914 cmd.cmd.status, cmd.cmd.reply_len);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100915
916 /* Partition doesn't exist (or other error) */
917 if (cmd.cmd.status != 0 || cmd.cmd.reply_len != 6)
918 return NULL;
919
920 /* Fetch address and length from reply */
921 addr = *((u16 *)cmd.buffer);
922 len = cmd.buffer[3] << 2;
923 /* Calucluate total length to allocate, including the 17 bytes
924 * for "sdb-partition-XX" that we append at the end of the buffer
925 */
926 tlen = sizeof(struct property) + len + 18;
927
928 prop = kcalloc(tlen, 1, GFP_KERNEL);
929 if (prop == NULL)
930 return NULL;
931 hdr = (struct smu_sdbp_header *)(prop + 1);
932 prop->name = ((char *)prop) + tlen - 18;
933 sprintf(prop->name, "sdb-partition-%02x", id);
934 prop->length = len;
935 prop->value = (unsigned char *)hdr;
936 prop->next = NULL;
937
938 /* Read the datablock */
939 if (smu_read_datablock((u8 *)hdr, addr, len)) {
940 printk(KERN_DEBUG "SMU: datablock read failed while reading "
941 "partition %02x !\n", id);
942 goto failure;
943 }
944
945 /* Got it, check a few things and create the property */
946 if (hdr->id != id) {
947 printk(KERN_DEBUG "SMU: Reading partition %02x and got "
948 "%02x !\n", id, hdr->id);
949 goto failure;
950 }
951 if (prom_add_property(smu->of_node, prop)) {
952 printk(KERN_DEBUG "SMU: Failed creating sdb-partition-%02x "
953 "property !\n", id);
954 goto failure;
955 }
956
957 return hdr;
958 failure:
959 kfree(prop);
960 return NULL;
961}
962
963/* Note: Only allowed to return error code in pointers (using ERR_PTR)
964 * when interruptible is 1
965 */
966struct smu_sdbp_header *__smu_get_sdb_partition(int id, unsigned int *size,
967 int interruptible)
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +1100968{
969 char pname[32];
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100970 struct smu_sdbp_header *part;
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +1100971
972 if (!smu)
973 return NULL;
974
975 sprintf(pname, "sdb-partition-%02x", id);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100976
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +1100977 DPRINTK("smu_get_sdb_partition(%02x)\n", id);
978
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100979 if (interruptible) {
980 int rc;
981 rc = down_interruptible(&smu_part_access);
982 if (rc)
983 return ERR_PTR(rc);
984 } else
985 down(&smu_part_access);
986
987 part = (struct smu_sdbp_header *)get_property(smu->of_node,
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +1100988 pname, size);
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100989 if (part == NULL) {
Benjamin Herrenschmidt1beb6a72005-12-14 13:10:10 +1100990 DPRINTK("trying to extract from SMU ...\n");
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +1100991 part = smu_create_sdb_partition(id);
992 if (part != NULL && size)
993 *size = part->len << 2;
994 }
995 up(&smu_part_access);
996 return part;
997}
998
999struct smu_sdbp_header *smu_get_sdb_partition(int id, unsigned int *size)
1000{
1001 return __smu_get_sdb_partition(id, size, 0);
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +11001002}
1003EXPORT_SYMBOL(smu_get_sdb_partition);
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001004
1005
1006/*
1007 * Userland driver interface
1008 */
1009
1010
1011static LIST_HEAD(smu_clist);
1012static DEFINE_SPINLOCK(smu_clist_lock);
1013
1014enum smu_file_mode {
1015 smu_file_commands,
1016 smu_file_events,
1017 smu_file_closing
1018};
1019
1020struct smu_private
1021{
1022 struct list_head list;
1023 enum smu_file_mode mode;
1024 int busy;
1025 struct smu_cmd cmd;
1026 spinlock_t lock;
1027 wait_queue_head_t wait;
1028 u8 buffer[SMU_MAX_DATA];
1029};
1030
1031
1032static int smu_open(struct inode *inode, struct file *file)
1033{
1034 struct smu_private *pp;
1035 unsigned long flags;
1036
1037 pp = kmalloc(sizeof(struct smu_private), GFP_KERNEL);
1038 if (pp == 0)
1039 return -ENOMEM;
1040 memset(pp, 0, sizeof(struct smu_private));
1041 spin_lock_init(&pp->lock);
1042 pp->mode = smu_file_commands;
1043 init_waitqueue_head(&pp->wait);
1044
1045 spin_lock_irqsave(&smu_clist_lock, flags);
1046 list_add(&pp->list, &smu_clist);
1047 spin_unlock_irqrestore(&smu_clist_lock, flags);
1048 file->private_data = pp;
1049
1050 return 0;
1051}
1052
1053
1054static void smu_user_cmd_done(struct smu_cmd *cmd, void *misc)
1055{
1056 struct smu_private *pp = misc;
1057
1058 wake_up_all(&pp->wait);
1059}
1060
1061
1062static ssize_t smu_write(struct file *file, const char __user *buf,
1063 size_t count, loff_t *ppos)
1064{
1065 struct smu_private *pp = file->private_data;
1066 unsigned long flags;
1067 struct smu_user_cmd_hdr hdr;
1068 int rc = 0;
1069
1070 if (pp->busy)
1071 return -EBUSY;
1072 else if (copy_from_user(&hdr, buf, sizeof(hdr)))
1073 return -EFAULT;
1074 else if (hdr.cmdtype == SMU_CMDTYPE_WANTS_EVENTS) {
1075 pp->mode = smu_file_events;
1076 return 0;
Benjamin Herrenschmidt183d0202005-11-07 14:29:02 +11001077 } else if (hdr.cmdtype == SMU_CMDTYPE_GET_PARTITION) {
1078 struct smu_sdbp_header *part;
1079 part = __smu_get_sdb_partition(hdr.cmd, NULL, 1);
1080 if (part == NULL)
1081 return -EINVAL;
1082 else if (IS_ERR(part))
1083 return PTR_ERR(part);
1084 return 0;
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001085 } else if (hdr.cmdtype != SMU_CMDTYPE_SMU)
1086 return -EINVAL;
1087 else if (pp->mode != smu_file_commands)
1088 return -EBADFD;
1089 else if (hdr.data_len > SMU_MAX_DATA)
1090 return -EINVAL;
1091
1092 spin_lock_irqsave(&pp->lock, flags);
1093 if (pp->busy) {
1094 spin_unlock_irqrestore(&pp->lock, flags);
1095 return -EBUSY;
1096 }
1097 pp->busy = 1;
1098 pp->cmd.status = 1;
1099 spin_unlock_irqrestore(&pp->lock, flags);
1100
1101 if (copy_from_user(pp->buffer, buf + sizeof(hdr), hdr.data_len)) {
1102 pp->busy = 0;
1103 return -EFAULT;
1104 }
1105
1106 pp->cmd.cmd = hdr.cmd;
1107 pp->cmd.data_len = hdr.data_len;
1108 pp->cmd.reply_len = SMU_MAX_DATA;
1109 pp->cmd.data_buf = pp->buffer;
1110 pp->cmd.reply_buf = pp->buffer;
1111 pp->cmd.done = smu_user_cmd_done;
1112 pp->cmd.misc = pp;
1113 rc = smu_queue_cmd(&pp->cmd);
1114 if (rc < 0)
1115 return rc;
1116 return count;
1117}
1118
1119
1120static ssize_t smu_read_command(struct file *file, struct smu_private *pp,
1121 char __user *buf, size_t count)
1122{
1123 DECLARE_WAITQUEUE(wait, current);
1124 struct smu_user_reply_hdr hdr;
1125 unsigned long flags;
1126 int size, rc = 0;
1127
1128 if (!pp->busy)
1129 return 0;
1130 if (count < sizeof(struct smu_user_reply_hdr))
1131 return -EOVERFLOW;
1132 spin_lock_irqsave(&pp->lock, flags);
1133 if (pp->cmd.status == 1) {
1134 if (file->f_flags & O_NONBLOCK)
1135 return -EAGAIN;
1136 add_wait_queue(&pp->wait, &wait);
1137 for (;;) {
1138 set_current_state(TASK_INTERRUPTIBLE);
1139 rc = 0;
1140 if (pp->cmd.status != 1)
1141 break;
1142 rc = -ERESTARTSYS;
1143 if (signal_pending(current))
1144 break;
1145 spin_unlock_irqrestore(&pp->lock, flags);
1146 schedule();
1147 spin_lock_irqsave(&pp->lock, flags);
1148 }
1149 set_current_state(TASK_RUNNING);
1150 remove_wait_queue(&pp->wait, &wait);
1151 }
1152 spin_unlock_irqrestore(&pp->lock, flags);
1153 if (rc)
1154 return rc;
1155 if (pp->cmd.status != 0)
1156 pp->cmd.reply_len = 0;
1157 size = sizeof(hdr) + pp->cmd.reply_len;
1158 if (count < size)
1159 size = count;
1160 rc = size;
1161 hdr.status = pp->cmd.status;
1162 hdr.reply_len = pp->cmd.reply_len;
1163 if (copy_to_user(buf, &hdr, sizeof(hdr)))
1164 return -EFAULT;
1165 size -= sizeof(hdr);
1166 if (size && copy_to_user(buf + sizeof(hdr), pp->buffer, size))
1167 return -EFAULT;
1168 pp->busy = 0;
1169
1170 return rc;
1171}
1172
1173
1174static ssize_t smu_read_events(struct file *file, struct smu_private *pp,
1175 char __user *buf, size_t count)
1176{
1177 /* Not implemented */
1178 msleep_interruptible(1000);
1179 return 0;
1180}
1181
1182
1183static ssize_t smu_read(struct file *file, char __user *buf,
1184 size_t count, loff_t *ppos)
1185{
1186 struct smu_private *pp = file->private_data;
1187
1188 if (pp->mode == smu_file_commands)
1189 return smu_read_command(file, pp, buf, count);
1190 if (pp->mode == smu_file_events)
1191 return smu_read_events(file, pp, buf, count);
1192
1193 return -EBADFD;
1194}
1195
1196static unsigned int smu_fpoll(struct file *file, poll_table *wait)
1197{
1198 struct smu_private *pp = file->private_data;
1199 unsigned int mask = 0;
1200 unsigned long flags;
1201
1202 if (pp == 0)
1203 return 0;
1204
1205 if (pp->mode == smu_file_commands) {
1206 poll_wait(file, &pp->wait, wait);
1207
1208 spin_lock_irqsave(&pp->lock, flags);
1209 if (pp->busy && pp->cmd.status != 1)
1210 mask |= POLLIN;
1211 spin_unlock_irqrestore(&pp->lock, flags);
1212 } if (pp->mode == smu_file_events) {
1213 /* Not yet implemented */
1214 }
1215 return mask;
1216}
1217
1218static int smu_release(struct inode *inode, struct file *file)
1219{
1220 struct smu_private *pp = file->private_data;
1221 unsigned long flags;
1222 unsigned int busy;
1223
1224 if (pp == 0)
1225 return 0;
1226
1227 file->private_data = NULL;
1228
1229 /* Mark file as closing to avoid races with new request */
1230 spin_lock_irqsave(&pp->lock, flags);
1231 pp->mode = smu_file_closing;
1232 busy = pp->busy;
1233
1234 /* Wait for any pending request to complete */
1235 if (busy && pp->cmd.status == 1) {
1236 DECLARE_WAITQUEUE(wait, current);
1237
1238 add_wait_queue(&pp->wait, &wait);
1239 for (;;) {
1240 set_current_state(TASK_UNINTERRUPTIBLE);
1241 if (pp->cmd.status != 1)
1242 break;
1243 spin_lock_irqsave(&pp->lock, flags);
1244 schedule();
1245 spin_unlock_irqrestore(&pp->lock, flags);
1246 }
1247 set_current_state(TASK_RUNNING);
1248 remove_wait_queue(&pp->wait, &wait);
1249 }
1250 spin_unlock_irqrestore(&pp->lock, flags);
1251
1252 spin_lock_irqsave(&smu_clist_lock, flags);
1253 list_del(&pp->list);
1254 spin_unlock_irqrestore(&smu_clist_lock, flags);
1255 kfree(pp);
1256
1257 return 0;
1258}
1259
1260
Stephen Rothwell6b67f62c2005-09-27 14:09:39 +10001261static struct file_operations smu_device_fops = {
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001262 .llseek = no_llseek,
1263 .read = smu_read,
1264 .write = smu_write,
1265 .poll = smu_fpoll,
1266 .open = smu_open,
1267 .release = smu_release,
1268};
1269
Stephen Rothwell6b67f62c2005-09-27 14:09:39 +10001270static struct miscdevice pmu_device = {
Benjamin Herrenschmidt0365ba72005-09-22 21:44:06 -07001271 MISC_DYNAMIC_MINOR, "smu", &smu_device_fops
1272};
1273
1274static int smu_device_init(void)
1275{
1276 if (!smu)
1277 return -ENODEV;
1278 if (misc_register(&pmu_device) < 0)
1279 printk(KERN_ERR "via-pmu: cannot register misc device.\n");
1280 return 0;
1281}
1282device_initcall(smu_device_init);