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Peter Korsgaard238b8722006-12-06 20:35:17 -08001/*
2 * uartlite.c: Serial driver for Xilinx uartlite serial controller
3 *
Grant Likely852e1ea2007-10-02 12:16:04 +10004 * Copyright (C) 2006 Peter Korsgaard <jacmet@sunsite.dk>
5 * Copyright (C) 2007 Secret Lab Technologies Ltd.
Peter Korsgaard238b8722006-12-06 20:35:17 -08006 *
7 * This file is licensed under the terms of the GNU General Public License
8 * version 2. This program is licensed "as is" without any warranty of any
9 * kind, whether express or implied.
10 */
11
12#include <linux/platform_device.h>
13#include <linux/module.h>
14#include <linux/console.h>
15#include <linux/serial.h>
16#include <linux/serial_core.h>
17#include <linux/tty.h>
18#include <linux/delay.h>
19#include <linux/interrupt.h>
Stephen Neuendorffer0e349b02008-01-09 06:35:05 +110020#include <linux/init.h>
Peter Korsgaard238b8722006-12-06 20:35:17 -080021#include <asm/io.h>
David Miller07081fd2010-03-10 14:05:35 -070022#if defined(CONFIG_OF) && (defined(CONFIG_PPC32) || defined(CONFIG_MICROBLAZE))
Stephen Neuendorffer0e349b02008-01-09 06:35:05 +110023#include <linux/of.h>
Grant Likely22ae7822010-07-29 11:49:01 -060024#include <linux/of_address.h>
Grant Likely852e1ea2007-10-02 12:16:04 +100025#include <linux/of_device.h>
26#include <linux/of_platform.h>
Stephen Neuendorffer0e349b02008-01-09 06:35:05 +110027
28/* Match table for of_platform binding */
29static struct of_device_id ulite_of_match[] __devinitdata = {
30 { .compatible = "xlnx,opb-uartlite-1.00.b", },
31 { .compatible = "xlnx,xps-uartlite-1.00.a", },
32 {}
33};
34MODULE_DEVICE_TABLE(of, ulite_of_match);
35
Grant Likely852e1ea2007-10-02 12:16:04 +100036#endif
Peter Korsgaard238b8722006-12-06 20:35:17 -080037
Grant Likely00775822007-10-02 12:15:49 +100038#define ULITE_NAME "ttyUL"
Peter Korsgaard238b8722006-12-06 20:35:17 -080039#define ULITE_MAJOR 204
40#define ULITE_MINOR 187
41#define ULITE_NR_UARTS 4
42
Grant Likely435706b2007-10-02 12:15:59 +100043/* ---------------------------------------------------------------------
44 * Register definitions
45 *
46 * For register details see datasheet:
47 * http://www.xilinx.com/bvdocs/ipcenter/data_sheet/opb_uartlite.pdf
48 */
49
Peter Korsgaard238b8722006-12-06 20:35:17 -080050#define ULITE_RX 0x00
51#define ULITE_TX 0x04
52#define ULITE_STATUS 0x08
53#define ULITE_CONTROL 0x0c
54
55#define ULITE_REGION 16
56
57#define ULITE_STATUS_RXVALID 0x01
58#define ULITE_STATUS_RXFULL 0x02
59#define ULITE_STATUS_TXEMPTY 0x04
60#define ULITE_STATUS_TXFULL 0x08
61#define ULITE_STATUS_IE 0x10
62#define ULITE_STATUS_OVERRUN 0x20
63#define ULITE_STATUS_FRAME 0x40
64#define ULITE_STATUS_PARITY 0x80
65
66#define ULITE_CONTROL_RST_TX 0x01
67#define ULITE_CONTROL_RST_RX 0x02
68#define ULITE_CONTROL_IE 0x10
69
70
Grant Likely483c79d2007-10-02 12:15:44 +100071static struct uart_port ulite_ports[ULITE_NR_UARTS];
Peter Korsgaard238b8722006-12-06 20:35:17 -080072
Grant Likely435706b2007-10-02 12:15:59 +100073/* ---------------------------------------------------------------------
74 * Core UART driver operations
75 */
76
Peter Korsgaard238b8722006-12-06 20:35:17 -080077static int ulite_receive(struct uart_port *port, int stat)
78{
Alan Coxebd2c8f2009-09-19 13:13:28 -070079 struct tty_struct *tty = port->state->port.tty;
Peter Korsgaard238b8722006-12-06 20:35:17 -080080 unsigned char ch = 0;
81 char flag = TTY_NORMAL;
82
83 if ((stat & (ULITE_STATUS_RXVALID | ULITE_STATUS_OVERRUN
84 | ULITE_STATUS_FRAME)) == 0)
85 return 0;
86
87 /* stats */
88 if (stat & ULITE_STATUS_RXVALID) {
89 port->icount.rx++;
John Linne5bbbb12010-04-07 09:32:55 -060090 ch = ioread32be(port->membase + ULITE_RX);
Peter Korsgaard238b8722006-12-06 20:35:17 -080091
92 if (stat & ULITE_STATUS_PARITY)
93 port->icount.parity++;
94 }
95
96 if (stat & ULITE_STATUS_OVERRUN)
97 port->icount.overrun++;
98
99 if (stat & ULITE_STATUS_FRAME)
100 port->icount.frame++;
101
102
103 /* drop byte with parity error if IGNPAR specificed */
104 if (stat & port->ignore_status_mask & ULITE_STATUS_PARITY)
105 stat &= ~ULITE_STATUS_RXVALID;
106
107 stat &= port->read_status_mask;
108
109 if (stat & ULITE_STATUS_PARITY)
110 flag = TTY_PARITY;
111
112
113 stat &= ~port->ignore_status_mask;
114
115 if (stat & ULITE_STATUS_RXVALID)
116 tty_insert_flip_char(tty, ch, flag);
117
118 if (stat & ULITE_STATUS_FRAME)
119 tty_insert_flip_char(tty, 0, TTY_FRAME);
120
121 if (stat & ULITE_STATUS_OVERRUN)
122 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
123
124 return 1;
125}
126
127static int ulite_transmit(struct uart_port *port, int stat)
128{
Alan Coxebd2c8f2009-09-19 13:13:28 -0700129 struct circ_buf *xmit = &port->state->xmit;
Peter Korsgaard238b8722006-12-06 20:35:17 -0800130
131 if (stat & ULITE_STATUS_TXFULL)
132 return 0;
133
134 if (port->x_char) {
John Linne5bbbb12010-04-07 09:32:55 -0600135 iowrite32be(port->x_char, port->membase + ULITE_TX);
Peter Korsgaard238b8722006-12-06 20:35:17 -0800136 port->x_char = 0;
137 port->icount.tx++;
138 return 1;
139 }
140
141 if (uart_circ_empty(xmit) || uart_tx_stopped(port))
142 return 0;
143
John Linne5bbbb12010-04-07 09:32:55 -0600144 iowrite32be(xmit->buf[xmit->tail], port->membase + ULITE_TX);
Peter Korsgaard238b8722006-12-06 20:35:17 -0800145 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE-1);
146 port->icount.tx++;
147
148 /* wake up */
149 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
150 uart_write_wakeup(port);
151
152 return 1;
153}
154
155static irqreturn_t ulite_isr(int irq, void *dev_id)
156{
Jeff Garzik15aafa22008-02-06 01:36:20 -0800157 struct uart_port *port = dev_id;
Peter Korsgaardd2cfe962009-09-09 16:54:04 +0200158 int busy, n = 0;
Peter Korsgaard238b8722006-12-06 20:35:17 -0800159
160 do {
John Linne5bbbb12010-04-07 09:32:55 -0600161 int stat = ioread32be(port->membase + ULITE_STATUS);
Peter Korsgaard238b8722006-12-06 20:35:17 -0800162 busy = ulite_receive(port, stat);
163 busy |= ulite_transmit(port, stat);
Peter Korsgaardd2cfe962009-09-09 16:54:04 +0200164 n++;
Peter Korsgaard238b8722006-12-06 20:35:17 -0800165 } while (busy);
166
Peter Korsgaardd2cfe962009-09-09 16:54:04 +0200167 /* work done? */
168 if (n > 1) {
169 tty_flip_buffer_push(port->state->port.tty);
170 return IRQ_HANDLED;
171 } else {
172 return IRQ_NONE;
173 }
Peter Korsgaard238b8722006-12-06 20:35:17 -0800174}
175
176static unsigned int ulite_tx_empty(struct uart_port *port)
177{
178 unsigned long flags;
179 unsigned int ret;
180
181 spin_lock_irqsave(&port->lock, flags);
John Linne5bbbb12010-04-07 09:32:55 -0600182 ret = ioread32be(port->membase + ULITE_STATUS);
Peter Korsgaard238b8722006-12-06 20:35:17 -0800183 spin_unlock_irqrestore(&port->lock, flags);
184
185 return ret & ULITE_STATUS_TXEMPTY ? TIOCSER_TEMT : 0;
186}
187
188static unsigned int ulite_get_mctrl(struct uart_port *port)
189{
190 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
191}
192
193static void ulite_set_mctrl(struct uart_port *port, unsigned int mctrl)
194{
195 /* N/A */
196}
197
198static void ulite_stop_tx(struct uart_port *port)
199{
200 /* N/A */
201}
202
203static void ulite_start_tx(struct uart_port *port)
204{
John Linne5bbbb12010-04-07 09:32:55 -0600205 ulite_transmit(port, ioread32be(port->membase + ULITE_STATUS));
Peter Korsgaard238b8722006-12-06 20:35:17 -0800206}
207
208static void ulite_stop_rx(struct uart_port *port)
209{
210 /* don't forward any more data (like !CREAD) */
211 port->ignore_status_mask = ULITE_STATUS_RXVALID | ULITE_STATUS_PARITY
212 | ULITE_STATUS_FRAME | ULITE_STATUS_OVERRUN;
213}
214
215static void ulite_enable_ms(struct uart_port *port)
216{
217 /* N/A */
218}
219
220static void ulite_break_ctl(struct uart_port *port, int ctl)
221{
222 /* N/A */
223}
224
225static int ulite_startup(struct uart_port *port)
226{
227 int ret;
228
229 ret = request_irq(port->irq, ulite_isr,
Peter Korsgaardd2cfe962009-09-09 16:54:04 +0200230 IRQF_SHARED | IRQF_SAMPLE_RANDOM, "uartlite", port);
Peter Korsgaard238b8722006-12-06 20:35:17 -0800231 if (ret)
232 return ret;
233
John Linne5bbbb12010-04-07 09:32:55 -0600234 iowrite32be(ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX,
Grant Likelye077b502007-10-03 02:47:02 +1000235 port->membase + ULITE_CONTROL);
John Linne5bbbb12010-04-07 09:32:55 -0600236 iowrite32be(ULITE_CONTROL_IE, port->membase + ULITE_CONTROL);
Peter Korsgaard238b8722006-12-06 20:35:17 -0800237
238 return 0;
239}
240
241static void ulite_shutdown(struct uart_port *port)
242{
John Linne5bbbb12010-04-07 09:32:55 -0600243 iowrite32be(0, port->membase + ULITE_CONTROL);
244 ioread32be(port->membase + ULITE_CONTROL); /* dummy */
Peter Korsgaard238b8722006-12-06 20:35:17 -0800245 free_irq(port->irq, port);
246}
247
Alan Cox606d0992006-12-08 02:38:45 -0800248static void ulite_set_termios(struct uart_port *port, struct ktermios *termios,
249 struct ktermios *old)
Peter Korsgaard238b8722006-12-06 20:35:17 -0800250{
251 unsigned long flags;
252 unsigned int baud;
253
254 spin_lock_irqsave(&port->lock, flags);
255
256 port->read_status_mask = ULITE_STATUS_RXVALID | ULITE_STATUS_OVERRUN
257 | ULITE_STATUS_TXFULL;
258
259 if (termios->c_iflag & INPCK)
260 port->read_status_mask |=
261 ULITE_STATUS_PARITY | ULITE_STATUS_FRAME;
262
263 port->ignore_status_mask = 0;
264 if (termios->c_iflag & IGNPAR)
265 port->ignore_status_mask |= ULITE_STATUS_PARITY
266 | ULITE_STATUS_FRAME | ULITE_STATUS_OVERRUN;
267
268 /* ignore all characters if CREAD is not set */
269 if ((termios->c_cflag & CREAD) == 0)
270 port->ignore_status_mask |=
271 ULITE_STATUS_RXVALID | ULITE_STATUS_PARITY
272 | ULITE_STATUS_FRAME | ULITE_STATUS_OVERRUN;
273
274 /* update timeout */
275 baud = uart_get_baud_rate(port, termios, old, 0, 460800);
276 uart_update_timeout(port, termios->c_cflag, baud);
277
278 spin_unlock_irqrestore(&port->lock, flags);
279}
280
281static const char *ulite_type(struct uart_port *port)
282{
283 return port->type == PORT_UARTLITE ? "uartlite" : NULL;
284}
285
286static void ulite_release_port(struct uart_port *port)
287{
288 release_mem_region(port->mapbase, ULITE_REGION);
289 iounmap(port->membase);
Al Virob81831c2007-02-09 16:38:25 +0000290 port->membase = NULL;
Peter Korsgaard238b8722006-12-06 20:35:17 -0800291}
292
293static int ulite_request_port(struct uart_port *port)
294{
Grant Likelya1080962008-11-14 09:59:48 -0700295 pr_debug("ulite console: port=%p; port->mapbase=%llx\n",
296 port, (unsigned long long) port->mapbase);
Stephen Neuendorffer0e349b02008-01-09 06:35:05 +1100297
Peter Korsgaard238b8722006-12-06 20:35:17 -0800298 if (!request_mem_region(port->mapbase, ULITE_REGION, "uartlite")) {
299 dev_err(port->dev, "Memory region busy\n");
300 return -EBUSY;
301 }
302
303 port->membase = ioremap(port->mapbase, ULITE_REGION);
304 if (!port->membase) {
305 dev_err(port->dev, "Unable to map registers\n");
306 release_mem_region(port->mapbase, ULITE_REGION);
307 return -EBUSY;
308 }
309
310 return 0;
311}
312
313static void ulite_config_port(struct uart_port *port, int flags)
314{
Peter Korsgaarde21654a2006-12-22 16:38:40 +0100315 if (!ulite_request_port(port))
316 port->type = PORT_UARTLITE;
Peter Korsgaard238b8722006-12-06 20:35:17 -0800317}
318
319static int ulite_verify_port(struct uart_port *port, struct serial_struct *ser)
320{
321 /* we don't want the core code to modify any port params */
322 return -EINVAL;
323}
324
325static struct uart_ops ulite_ops = {
326 .tx_empty = ulite_tx_empty,
327 .set_mctrl = ulite_set_mctrl,
328 .get_mctrl = ulite_get_mctrl,
329 .stop_tx = ulite_stop_tx,
330 .start_tx = ulite_start_tx,
331 .stop_rx = ulite_stop_rx,
332 .enable_ms = ulite_enable_ms,
333 .break_ctl = ulite_break_ctl,
334 .startup = ulite_startup,
335 .shutdown = ulite_shutdown,
336 .set_termios = ulite_set_termios,
337 .type = ulite_type,
338 .release_port = ulite_release_port,
339 .request_port = ulite_request_port,
340 .config_port = ulite_config_port,
341 .verify_port = ulite_verify_port
342};
343
Grant Likely435706b2007-10-02 12:15:59 +1000344/* ---------------------------------------------------------------------
345 * Console driver operations
346 */
347
Peter Korsgaard238b8722006-12-06 20:35:17 -0800348#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
349static void ulite_console_wait_tx(struct uart_port *port)
350{
351 int i;
Grant Likely1d6b6982007-10-23 14:27:46 +1000352 u8 val;
Peter Korsgaard238b8722006-12-06 20:35:17 -0800353
Grant Likely1d6b6982007-10-23 14:27:46 +1000354 /* Spin waiting for TX fifo to have space available */
355 for (i = 0; i < 100000; i++) {
John Linne5bbbb12010-04-07 09:32:55 -0600356 val = ioread32be(port->membase + ULITE_STATUS);
Grant Likely1d6b6982007-10-23 14:27:46 +1000357 if ((val & ULITE_STATUS_TXFULL) == 0)
Peter Korsgaard238b8722006-12-06 20:35:17 -0800358 break;
Grant Likely1d6b6982007-10-23 14:27:46 +1000359 cpu_relax();
Peter Korsgaard238b8722006-12-06 20:35:17 -0800360 }
361}
362
363static void ulite_console_putchar(struct uart_port *port, int ch)
364{
365 ulite_console_wait_tx(port);
John Linne5bbbb12010-04-07 09:32:55 -0600366 iowrite32be(ch, port->membase + ULITE_TX);
Peter Korsgaard238b8722006-12-06 20:35:17 -0800367}
368
369static void ulite_console_write(struct console *co, const char *s,
370 unsigned int count)
371{
Grant Likely483c79d2007-10-02 12:15:44 +1000372 struct uart_port *port = &ulite_ports[co->index];
Peter Korsgaard238b8722006-12-06 20:35:17 -0800373 unsigned long flags;
374 unsigned int ier;
375 int locked = 1;
376
377 if (oops_in_progress) {
378 locked = spin_trylock_irqsave(&port->lock, flags);
379 } else
380 spin_lock_irqsave(&port->lock, flags);
381
382 /* save and disable interrupt */
John Linne5bbbb12010-04-07 09:32:55 -0600383 ier = ioread32be(port->membase + ULITE_STATUS) & ULITE_STATUS_IE;
384 iowrite32be(0, port->membase + ULITE_CONTROL);
Peter Korsgaard238b8722006-12-06 20:35:17 -0800385
386 uart_console_write(port, s, count, ulite_console_putchar);
387
388 ulite_console_wait_tx(port);
389
390 /* restore interrupt state */
391 if (ier)
John Linne5bbbb12010-04-07 09:32:55 -0600392 iowrite32be(ULITE_CONTROL_IE, port->membase + ULITE_CONTROL);
Peter Korsgaard238b8722006-12-06 20:35:17 -0800393
394 if (locked)
395 spin_unlock_irqrestore(&port->lock, flags);
396}
397
Richard Röjfors03eac7b2010-02-02 13:44:12 -0800398static int __devinit ulite_console_setup(struct console *co, char *options)
Peter Korsgaard238b8722006-12-06 20:35:17 -0800399{
400 struct uart_port *port;
401 int baud = 9600;
402 int bits = 8;
403 int parity = 'n';
404 int flow = 'n';
405
406 if (co->index < 0 || co->index >= ULITE_NR_UARTS)
407 return -EINVAL;
408
Grant Likely483c79d2007-10-02 12:15:44 +1000409 port = &ulite_ports[co->index];
Peter Korsgaard238b8722006-12-06 20:35:17 -0800410
Grant Likely3de66a12008-02-06 10:23:41 -0700411 /* Has the device been initialized yet? */
Grant Likelyfb4e6e62007-10-02 12:16:09 +1000412 if (!port->mapbase) {
413 pr_debug("console on ttyUL%i not present\n", co->index);
414 return -ENODEV;
415 }
416
Peter Korsgaard238b8722006-12-06 20:35:17 -0800417 /* not initialized yet? */
Grant Likely852e1ea2007-10-02 12:16:04 +1000418 if (!port->membase) {
Grant Likelyfb4e6e62007-10-02 12:16:09 +1000419 if (ulite_request_port(port))
420 return -ENODEV;
Grant Likely852e1ea2007-10-02 12:16:04 +1000421 }
Peter Korsgaard238b8722006-12-06 20:35:17 -0800422
423 if (options)
424 uart_parse_options(options, &baud, &parity, &bits, &flow);
425
426 return uart_set_options(port, co, baud, parity, bits, flow);
427}
428
429static struct uart_driver ulite_uart_driver;
430
431static struct console ulite_console = {
Grant Likely00775822007-10-02 12:15:49 +1000432 .name = ULITE_NAME,
Peter Korsgaard238b8722006-12-06 20:35:17 -0800433 .write = ulite_console_write,
434 .device = uart_console_device,
435 .setup = ulite_console_setup,
436 .flags = CON_PRINTBUFFER,
437 .index = -1, /* Specified on the cmdline (e.g. console=ttyUL0 ) */
438 .data = &ulite_uart_driver,
439};
440
441static int __init ulite_console_init(void)
442{
443 register_console(&ulite_console);
444 return 0;
445}
446
447console_initcall(ulite_console_init);
448
449#endif /* CONFIG_SERIAL_UARTLITE_CONSOLE */
450
451static struct uart_driver ulite_uart_driver = {
452 .owner = THIS_MODULE,
453 .driver_name = "uartlite",
Grant Likely00775822007-10-02 12:15:49 +1000454 .dev_name = ULITE_NAME,
Peter Korsgaard238b8722006-12-06 20:35:17 -0800455 .major = ULITE_MAJOR,
456 .minor = ULITE_MINOR,
457 .nr = ULITE_NR_UARTS,
458#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
459 .cons = &ulite_console,
460#endif
461};
462
Grant Likely435706b2007-10-02 12:15:59 +1000463/* ---------------------------------------------------------------------
464 * Port assignment functions (mapping devices to uart_port structures)
465 */
466
467/** ulite_assign: register a uartlite device with the driver
468 *
469 * @dev: pointer to device structure
470 * @id: requested id number. Pass -1 for automatic port assignment
471 * @base: base address of uartlite registers
472 * @irq: irq number for uartlite
473 *
474 * Returns: 0 on success, <0 otherwise
475 */
Grant Likely8fa7b612007-10-02 12:15:54 +1000476static int __devinit ulite_assign(struct device *dev, int id, u32 base, int irq)
477{
478 struct uart_port *port;
479 int rc;
480
481 /* if id = -1; then scan for a free id and use that */
482 if (id < 0) {
483 for (id = 0; id < ULITE_NR_UARTS; id++)
484 if (ulite_ports[id].mapbase == 0)
485 break;
486 }
487 if (id < 0 || id >= ULITE_NR_UARTS) {
488 dev_err(dev, "%s%i too large\n", ULITE_NAME, id);
489 return -EINVAL;
490 }
491
Grant Likelyfb4e6e62007-10-02 12:16:09 +1000492 if ((ulite_ports[id].mapbase) && (ulite_ports[id].mapbase != base)) {
Grant Likely8fa7b612007-10-02 12:15:54 +1000493 dev_err(dev, "cannot assign to %s%i; it is already in use\n",
494 ULITE_NAME, id);
495 return -EBUSY;
496 }
497
498 port = &ulite_ports[id];
499
500 spin_lock_init(&port->lock);
501 port->fifosize = 16;
502 port->regshift = 2;
503 port->iotype = UPIO_MEM;
504 port->iobase = 1; /* mark port in use */
505 port->mapbase = base;
506 port->membase = NULL;
507 port->ops = &ulite_ops;
508 port->irq = irq;
509 port->flags = UPF_BOOT_AUTOCONF;
510 port->dev = dev;
511 port->type = PORT_UNKNOWN;
512 port->line = id;
513
514 dev_set_drvdata(dev, port);
515
516 /* Register the port */
517 rc = uart_add_one_port(&ulite_uart_driver, port);
518 if (rc) {
519 dev_err(dev, "uart_add_one_port() failed; err=%i\n", rc);
520 port->mapbase = 0;
521 dev_set_drvdata(dev, NULL);
522 return rc;
523 }
524
525 return 0;
526}
527
Grant Likely435706b2007-10-02 12:15:59 +1000528/** ulite_release: register a uartlite device with the driver
529 *
530 * @dev: pointer to device structure
531 */
Stephen Neuendorfferf67702a2008-01-09 06:35:09 +1100532static int __devexit ulite_release(struct device *dev)
Grant Likely8fa7b612007-10-02 12:15:54 +1000533{
534 struct uart_port *port = dev_get_drvdata(dev);
535 int rc = 0;
536
537 if (port) {
538 rc = uart_remove_one_port(&ulite_uart_driver, port);
539 dev_set_drvdata(dev, NULL);
540 port->mapbase = 0;
541 }
542
543 return rc;
544}
545
Grant Likely435706b2007-10-02 12:15:59 +1000546/* ---------------------------------------------------------------------
547 * Platform bus binding
548 */
549
Peter Korsgaard238b8722006-12-06 20:35:17 -0800550static int __devinit ulite_probe(struct platform_device *pdev)
551{
552 struct resource *res, *res2;
Peter Korsgaard238b8722006-12-06 20:35:17 -0800553
554 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
555 if (!res)
556 return -ENODEV;
557
558 res2 = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
559 if (!res2)
560 return -ENODEV;
561
Grant Likely8fa7b612007-10-02 12:15:54 +1000562 return ulite_assign(&pdev->dev, pdev->id, res->start, res2->start);
Peter Korsgaard238b8722006-12-06 20:35:17 -0800563}
564
Stephen Neuendorfferf67702a2008-01-09 06:35:09 +1100565static int __devexit ulite_remove(struct platform_device *pdev)
Peter Korsgaard238b8722006-12-06 20:35:17 -0800566{
Grant Likely8fa7b612007-10-02 12:15:54 +1000567 return ulite_release(&pdev->dev);
Peter Korsgaard238b8722006-12-06 20:35:17 -0800568}
569
Kay Sieverse169c132008-04-15 14:34:35 -0700570/* work with hotplug and coldplug */
571MODULE_ALIAS("platform:uartlite");
572
Peter Korsgaard238b8722006-12-06 20:35:17 -0800573static struct platform_driver ulite_platform_driver = {
574 .probe = ulite_probe,
Stephen Neuendorfferf67702a2008-01-09 06:35:09 +1100575 .remove = __devexit_p(ulite_remove),
Peter Korsgaard238b8722006-12-06 20:35:17 -0800576 .driver = {
577 .owner = THIS_MODULE,
578 .name = "uartlite",
579 },
580};
581
Grant Likely435706b2007-10-02 12:15:59 +1000582/* ---------------------------------------------------------------------
Grant Likely852e1ea2007-10-02 12:16:04 +1000583 * OF bus bindings
584 */
David Miller07081fd2010-03-10 14:05:35 -0700585#if defined(CONFIG_OF) && (defined(CONFIG_PPC32) || defined(CONFIG_MICROBLAZE))
Grant Likely852e1ea2007-10-02 12:16:04 +1000586static int __devinit
Grant Likely2dc11582010-08-06 09:25:50 -0600587ulite_of_probe(struct platform_device *op, const struct of_device_id *match)
Grant Likely852e1ea2007-10-02 12:16:04 +1000588{
589 struct resource res;
590 const unsigned int *id;
591 int irq, rc;
592
Harvey Harrison71cc2c22008-04-30 00:55:10 -0700593 dev_dbg(&op->dev, "%s(%p, %p)\n", __func__, op, match);
Grant Likely852e1ea2007-10-02 12:16:04 +1000594
Grant Likely61c7a082010-04-13 16:12:29 -0700595 rc = of_address_to_resource(op->dev.of_node, 0, &res);
Grant Likely852e1ea2007-10-02 12:16:04 +1000596 if (rc) {
Grant Likelye077b502007-10-03 02:47:02 +1000597 dev_err(&op->dev, "invalid address\n");
Grant Likely852e1ea2007-10-02 12:16:04 +1000598 return rc;
599 }
600
Grant Likely61c7a082010-04-13 16:12:29 -0700601 irq = irq_of_parse_and_map(op->dev.of_node, 0);
Grant Likely852e1ea2007-10-02 12:16:04 +1000602
Grant Likely61c7a082010-04-13 16:12:29 -0700603 id = of_get_property(op->dev.of_node, "port-number", NULL);
Grant Likely852e1ea2007-10-02 12:16:04 +1000604
John Linne5bbbb12010-04-07 09:32:55 -0600605 return ulite_assign(&op->dev, id ? *id : -1, res.start, irq);
Grant Likely852e1ea2007-10-02 12:16:04 +1000606}
607
Grant Likely2dc11582010-08-06 09:25:50 -0600608static int __devexit ulite_of_remove(struct platform_device *op)
Grant Likely852e1ea2007-10-02 12:16:04 +1000609{
610 return ulite_release(&op->dev);
611}
612
Grant Likely852e1ea2007-10-02 12:16:04 +1000613static struct of_platform_driver ulite_of_driver = {
Grant Likely852e1ea2007-10-02 12:16:04 +1000614 .probe = ulite_of_probe,
615 .remove = __devexit_p(ulite_of_remove),
616 .driver = {
617 .name = "uartlite",
Grant Likely40182942010-04-13 16:13:02 -0700618 .owner = THIS_MODULE,
619 .of_match_table = ulite_of_match,
Grant Likely852e1ea2007-10-02 12:16:04 +1000620 },
621};
622
623/* Registration helpers to keep the number of #ifdefs to a minimum */
624static inline int __init ulite_of_register(void)
625{
626 pr_debug("uartlite: calling of_register_platform_driver()\n");
627 return of_register_platform_driver(&ulite_of_driver);
628}
629
630static inline void __exit ulite_of_unregister(void)
631{
632 of_unregister_platform_driver(&ulite_of_driver);
633}
David Miller07081fd2010-03-10 14:05:35 -0700634#else /* CONFIG_OF && (CONFIG_PPC32 || CONFIG_MICROBLAZE) */
635/* Appropriate config not enabled; do nothing helpers */
Grant Likely852e1ea2007-10-02 12:16:04 +1000636static inline int __init ulite_of_register(void) { return 0; }
637static inline void __exit ulite_of_unregister(void) { }
David Miller07081fd2010-03-10 14:05:35 -0700638#endif /* CONFIG_OF && (CONFIG_PPC32 || CONFIG_MICROBLAZE) */
Grant Likely852e1ea2007-10-02 12:16:04 +1000639
640/* ---------------------------------------------------------------------
Grant Likely435706b2007-10-02 12:15:59 +1000641 * Module setup/teardown
642 */
643
Peter Korsgaard238b8722006-12-06 20:35:17 -0800644int __init ulite_init(void)
645{
646 int ret;
647
Grant Likely852e1ea2007-10-02 12:16:04 +1000648 pr_debug("uartlite: calling uart_register_driver()\n");
Peter Korsgaard238b8722006-12-06 20:35:17 -0800649 ret = uart_register_driver(&ulite_uart_driver);
650 if (ret)
Grant Likely852e1ea2007-10-02 12:16:04 +1000651 goto err_uart;
Peter Korsgaard238b8722006-12-06 20:35:17 -0800652
Grant Likely852e1ea2007-10-02 12:16:04 +1000653 ret = ulite_of_register();
654 if (ret)
655 goto err_of;
656
657 pr_debug("uartlite: calling platform_driver_register()\n");
Peter Korsgaard238b8722006-12-06 20:35:17 -0800658 ret = platform_driver_register(&ulite_platform_driver);
659 if (ret)
Grant Likely852e1ea2007-10-02 12:16:04 +1000660 goto err_plat;
Peter Korsgaard238b8722006-12-06 20:35:17 -0800661
Grant Likely852e1ea2007-10-02 12:16:04 +1000662 return 0;
663
664err_plat:
665 ulite_of_unregister();
666err_of:
667 uart_unregister_driver(&ulite_uart_driver);
668err_uart:
669 printk(KERN_ERR "registering uartlite driver failed: err=%i", ret);
Peter Korsgaard238b8722006-12-06 20:35:17 -0800670 return ret;
671}
672
673void __exit ulite_exit(void)
674{
675 platform_driver_unregister(&ulite_platform_driver);
Grant Likely852e1ea2007-10-02 12:16:04 +1000676 ulite_of_unregister();
Peter Korsgaard238b8722006-12-06 20:35:17 -0800677 uart_unregister_driver(&ulite_uart_driver);
678}
679
680module_init(ulite_init);
681module_exit(ulite_exit);
682
683MODULE_AUTHOR("Peter Korsgaard <jacmet@sunsite.dk>");
684MODULE_DESCRIPTION("Xilinx uartlite serial driver");
685MODULE_LICENSE("GPL");