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serial/imx: make imx_port.devdata member point to const data
[deliverable/linux.git] / drivers / tty / serial / mpc52xx_uart.c
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1/*
2 * Driver for the PSC of the Freescale MPC52xx PSCs configured as UARTs.
3 *
4 * FIXME According to the usermanual the status bits in the status register
5 * are only updated when the peripherals access the FIFO and not when the
6 * CPU access them. So since we use this bits to know when we stop writing
7 * and reading, they may not be updated in-time and a race condition may
8 * exists. But I haven't be able to prove this and I don't care. But if
9 * any problem arises, it might worth checking. The TX/RX FIFO Stats
10 * registers should be used in addition.
11 * Update: Actually, they seem updated ... At least the bits we use.
12 *
13 *
14 * Maintainer : Sylvain Munaut <tnt@246tNt.com>
15 *
16 * Some of the code has been inspired/copied from the 2.4 code written
17 * by Dale Farnsworth <dfarnsworth@mvista.com>.
18 *
19 * Copyright (C) 2008 Freescale Semiconductor Inc.
20 * John Rigby <jrigby@gmail.com>
21 * Added support for MPC5121
22 * Copyright (C) 2006 Secret Lab Technologies Ltd.
23 * Grant Likely <grant.likely@secretlab.ca>
24 * Copyright (C) 2004-2006 Sylvain Munaut <tnt@246tNt.com>
25 * Copyright (C) 2003 MontaVista, Software, Inc.
26 *
27 * This file is licensed under the terms of the GNU General Public License
28 * version 2. This program is licensed "as is" without any warranty of any
29 * kind, whether express or implied.
30 */
31
32#undef DEBUG
33
34#include <linux/device.h>
35#include <linux/module.h>
36#include <linux/tty.h>
37#include <linux/tty_flip.h>
38#include <linux/serial.h>
39#include <linux/sysrq.h>
40#include <linux/console.h>
41#include <linux/delay.h>
42#include <linux/io.h>
43#include <linux/of.h>
44#include <linux/of_platform.h>
45#include <linux/clk.h>
46
47#include <asm/mpc52xx.h>
48#include <asm/mpc52xx_psc.h>
49
50#if defined(CONFIG_SERIAL_MPC52xx_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
51#define SUPPORT_SYSRQ
52#endif
53
54#include <linux/serial_core.h>
55
56
57/* We've been assigned a range on the "Low-density serial ports" major */
58#define SERIAL_PSC_MAJOR 204
59#define SERIAL_PSC_MINOR 148
60
61
62#define ISR_PASS_LIMIT 256 /* Max number of iteration in the interrupt */
63
64
65static struct uart_port mpc52xx_uart_ports[MPC52xx_PSC_MAXNUM];
66 /* Rem: - We use the read_status_mask as a shadow of
67 * psc->mpc52xx_psc_imr
68 * - It's important that is array is all zero on start as we
69 * use it to know if it's initialized or not ! If it's not sure
70 * it's cleared, then a memset(...,0,...) should be added to
71 * the console_init
72 */
73
74/* lookup table for matching device nodes to index numbers */
75static struct device_node *mpc52xx_uart_nodes[MPC52xx_PSC_MAXNUM];
76
77static void mpc52xx_uart_of_enumerate(void);
78
79
80#define PSC(port) ((struct mpc52xx_psc __iomem *)((port)->membase))
81
82
83/* Forward declaration of the interruption handling routine */
84static irqreturn_t mpc52xx_uart_int(int irq, void *dev_id);
85static irqreturn_t mpc5xxx_uart_process_int(struct uart_port *port);
86
87
88/* Simple macro to test if a port is console or not. This one is taken
89 * for serial_core.c and maybe should be moved to serial_core.h ? */
90#ifdef CONFIG_SERIAL_CORE_CONSOLE
91#define uart_console(port) \
92 ((port)->cons && (port)->cons->index == (port)->line)
93#else
94#define uart_console(port) (0)
95#endif
96
97/* ======================================================================== */
98/* PSC fifo operations for isolating differences between 52xx and 512x */
99/* ======================================================================== */
100
101struct psc_ops {
102 void (*fifo_init)(struct uart_port *port);
103 int (*raw_rx_rdy)(struct uart_port *port);
104 int (*raw_tx_rdy)(struct uart_port *port);
105 int (*rx_rdy)(struct uart_port *port);
106 int (*tx_rdy)(struct uart_port *port);
107 int (*tx_empty)(struct uart_port *port);
108 void (*stop_rx)(struct uart_port *port);
109 void (*start_tx)(struct uart_port *port);
110 void (*stop_tx)(struct uart_port *port);
111 void (*rx_clr_irq)(struct uart_port *port);
112 void (*tx_clr_irq)(struct uart_port *port);
113 void (*write_char)(struct uart_port *port, unsigned char c);
114 unsigned char (*read_char)(struct uart_port *port);
115 void (*cw_disable_ints)(struct uart_port *port);
116 void (*cw_restore_ints)(struct uart_port *port);
117 unsigned int (*set_baudrate)(struct uart_port *port,
118 struct ktermios *new,
119 struct ktermios *old);
120 int (*clock)(struct uart_port *port, int enable);
121 int (*fifoc_init)(void);
122 void (*fifoc_uninit)(void);
123 void (*get_irq)(struct uart_port *, struct device_node *);
124 irqreturn_t (*handle_irq)(struct uart_port *port);
125};
126
127/* setting the prescaler and divisor reg is common for all chips */
128static inline void mpc52xx_set_divisor(struct mpc52xx_psc __iomem *psc,
129 u16 prescaler, unsigned int divisor)
130{
131 /* select prescaler */
132 out_be16(&psc->mpc52xx_psc_clock_select, prescaler);
133 out_8(&psc->ctur, divisor >> 8);
134 out_8(&psc->ctlr, divisor & 0xff);
135}
136
137#ifdef CONFIG_PPC_MPC52xx
138#define FIFO_52xx(port) ((struct mpc52xx_psc_fifo __iomem *)(PSC(port)+1))
139static void mpc52xx_psc_fifo_init(struct uart_port *port)
140{
141 struct mpc52xx_psc __iomem *psc = PSC(port);
142 struct mpc52xx_psc_fifo __iomem *fifo = FIFO_52xx(port);
143
144 out_8(&fifo->rfcntl, 0x00);
145 out_be16(&fifo->rfalarm, 0x1ff);
146 out_8(&fifo->tfcntl, 0x07);
147 out_be16(&fifo->tfalarm, 0x80);
148
149 port->read_status_mask |= MPC52xx_PSC_IMR_RXRDY | MPC52xx_PSC_IMR_TXRDY;
150 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
151}
152
153static int mpc52xx_psc_raw_rx_rdy(struct uart_port *port)
154{
155 return in_be16(&PSC(port)->mpc52xx_psc_status)
156 & MPC52xx_PSC_SR_RXRDY;
157}
158
159static int mpc52xx_psc_raw_tx_rdy(struct uart_port *port)
160{
161 return in_be16(&PSC(port)->mpc52xx_psc_status)
162 & MPC52xx_PSC_SR_TXRDY;
163}
164
165
166static int mpc52xx_psc_rx_rdy(struct uart_port *port)
167{
168 return in_be16(&PSC(port)->mpc52xx_psc_isr)
169 & port->read_status_mask
170 & MPC52xx_PSC_IMR_RXRDY;
171}
172
173static int mpc52xx_psc_tx_rdy(struct uart_port *port)
174{
175 return in_be16(&PSC(port)->mpc52xx_psc_isr)
176 & port->read_status_mask
177 & MPC52xx_PSC_IMR_TXRDY;
178}
179
180static int mpc52xx_psc_tx_empty(struct uart_port *port)
181{
182 return in_be16(&PSC(port)->mpc52xx_psc_status)
183 & MPC52xx_PSC_SR_TXEMP;
184}
185
186static void mpc52xx_psc_start_tx(struct uart_port *port)
187{
188 port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY;
189 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
190}
191
192static void mpc52xx_psc_stop_tx(struct uart_port *port)
193{
194 port->read_status_mask &= ~MPC52xx_PSC_IMR_TXRDY;
195 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
196}
197
198static void mpc52xx_psc_stop_rx(struct uart_port *port)
199{
200 port->read_status_mask &= ~MPC52xx_PSC_IMR_RXRDY;
201 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
202}
203
204static void mpc52xx_psc_rx_clr_irq(struct uart_port *port)
205{
206}
207
208static void mpc52xx_psc_tx_clr_irq(struct uart_port *port)
209{
210}
211
212static void mpc52xx_psc_write_char(struct uart_port *port, unsigned char c)
213{
214 out_8(&PSC(port)->mpc52xx_psc_buffer_8, c);
215}
216
217static unsigned char mpc52xx_psc_read_char(struct uart_port *port)
218{
219 return in_8(&PSC(port)->mpc52xx_psc_buffer_8);
220}
221
222static void mpc52xx_psc_cw_disable_ints(struct uart_port *port)
223{
224 out_be16(&PSC(port)->mpc52xx_psc_imr, 0);
225}
226
227static void mpc52xx_psc_cw_restore_ints(struct uart_port *port)
228{
229 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
230}
231
232static unsigned int mpc5200_psc_set_baudrate(struct uart_port *port,
233 struct ktermios *new,
234 struct ktermios *old)
235{
236 unsigned int baud;
237 unsigned int divisor;
238
239 /* The 5200 has a fixed /32 prescaler, uartclk contains the ipb freq */
240 baud = uart_get_baud_rate(port, new, old,
241 port->uartclk / (32 * 0xffff) + 1,
242 port->uartclk / 32);
243 divisor = (port->uartclk + 16 * baud) / (32 * baud);
244
245 /* enable the /32 prescaler and set the divisor */
246 mpc52xx_set_divisor(PSC(port), 0xdd00, divisor);
247 return baud;
248}
249
250static unsigned int mpc5200b_psc_set_baudrate(struct uart_port *port,
251 struct ktermios *new,
252 struct ktermios *old)
253{
254 unsigned int baud;
255 unsigned int divisor;
256 u16 prescaler;
257
258 /* The 5200B has a selectable /4 or /32 prescaler, uartclk contains the
259 * ipb freq */
260 baud = uart_get_baud_rate(port, new, old,
261 port->uartclk / (32 * 0xffff) + 1,
262 port->uartclk / 4);
263 divisor = (port->uartclk + 2 * baud) / (4 * baud);
264
265 /* select the proper prescaler and set the divisor
266 * prefer high prescaler for more tolerance on low baudrates */
267 if (divisor > 0xffff || baud <= 115200) {
268 divisor = (divisor + 4) / 8;
269 prescaler = 0xdd00; /* /32 */
270 } else
271 prescaler = 0xff00; /* /4 */
272 mpc52xx_set_divisor(PSC(port), prescaler, divisor);
273 return baud;
274}
275
276static void mpc52xx_psc_get_irq(struct uart_port *port, struct device_node *np)
277{
278 port->irqflags = 0;
279 port->irq = irq_of_parse_and_map(np, 0);
280}
281
282/* 52xx specific interrupt handler. The caller holds the port lock */
283static irqreturn_t mpc52xx_psc_handle_irq(struct uart_port *port)
284{
285 return mpc5xxx_uart_process_int(port);
286}
287
288static struct psc_ops mpc52xx_psc_ops = {
289 .fifo_init = mpc52xx_psc_fifo_init,
290 .raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
291 .raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
292 .rx_rdy = mpc52xx_psc_rx_rdy,
293 .tx_rdy = mpc52xx_psc_tx_rdy,
294 .tx_empty = mpc52xx_psc_tx_empty,
295 .stop_rx = mpc52xx_psc_stop_rx,
296 .start_tx = mpc52xx_psc_start_tx,
297 .stop_tx = mpc52xx_psc_stop_tx,
298 .rx_clr_irq = mpc52xx_psc_rx_clr_irq,
299 .tx_clr_irq = mpc52xx_psc_tx_clr_irq,
300 .write_char = mpc52xx_psc_write_char,
301 .read_char = mpc52xx_psc_read_char,
302 .cw_disable_ints = mpc52xx_psc_cw_disable_ints,
303 .cw_restore_ints = mpc52xx_psc_cw_restore_ints,
304 .set_baudrate = mpc5200_psc_set_baudrate,
305 .get_irq = mpc52xx_psc_get_irq,
306 .handle_irq = mpc52xx_psc_handle_irq,
307};
308
309static struct psc_ops mpc5200b_psc_ops = {
310 .fifo_init = mpc52xx_psc_fifo_init,
311 .raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
312 .raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
313 .rx_rdy = mpc52xx_psc_rx_rdy,
314 .tx_rdy = mpc52xx_psc_tx_rdy,
315 .tx_empty = mpc52xx_psc_tx_empty,
316 .stop_rx = mpc52xx_psc_stop_rx,
317 .start_tx = mpc52xx_psc_start_tx,
318 .stop_tx = mpc52xx_psc_stop_tx,
319 .rx_clr_irq = mpc52xx_psc_rx_clr_irq,
320 .tx_clr_irq = mpc52xx_psc_tx_clr_irq,
321 .write_char = mpc52xx_psc_write_char,
322 .read_char = mpc52xx_psc_read_char,
323 .cw_disable_ints = mpc52xx_psc_cw_disable_ints,
324 .cw_restore_ints = mpc52xx_psc_cw_restore_ints,
325 .set_baudrate = mpc5200b_psc_set_baudrate,
326 .get_irq = mpc52xx_psc_get_irq,
327 .handle_irq = mpc52xx_psc_handle_irq,
328};
329
330#endif /* CONFIG_MPC52xx */
331
332#ifdef CONFIG_PPC_MPC512x
333#define FIFO_512x(port) ((struct mpc512x_psc_fifo __iomem *)(PSC(port)+1))
334
335/* PSC FIFO Controller for mpc512x */
336struct psc_fifoc {
337 u32 fifoc_cmd;
338 u32 fifoc_int;
339 u32 fifoc_dma;
340 u32 fifoc_axe;
341 u32 fifoc_debug;
342};
343
344static struct psc_fifoc __iomem *psc_fifoc;
345static unsigned int psc_fifoc_irq;
346
347static void mpc512x_psc_fifo_init(struct uart_port *port)
348{
349 /* /32 prescaler */
350 out_be16(&PSC(port)->mpc52xx_psc_clock_select, 0xdd00);
351
352 out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_RESET_SLICE);
353 out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
354 out_be32(&FIFO_512x(port)->txalarm, 1);
355 out_be32(&FIFO_512x(port)->tximr, 0);
356
357 out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_RESET_SLICE);
358 out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
359 out_be32(&FIFO_512x(port)->rxalarm, 1);
360 out_be32(&FIFO_512x(port)->rximr, 0);
361
362 out_be32(&FIFO_512x(port)->tximr, MPC512x_PSC_FIFO_ALARM);
363 out_be32(&FIFO_512x(port)->rximr, MPC512x_PSC_FIFO_ALARM);
364}
365
366static int mpc512x_psc_raw_rx_rdy(struct uart_port *port)
367{
368 return !(in_be32(&FIFO_512x(port)->rxsr) & MPC512x_PSC_FIFO_EMPTY);
369}
370
371static int mpc512x_psc_raw_tx_rdy(struct uart_port *port)
372{
373 return !(in_be32(&FIFO_512x(port)->txsr) & MPC512x_PSC_FIFO_FULL);
374}
375
376static int mpc512x_psc_rx_rdy(struct uart_port *port)
377{
378 return in_be32(&FIFO_512x(port)->rxsr)
379 & in_be32(&FIFO_512x(port)->rximr)
380 & MPC512x_PSC_FIFO_ALARM;
381}
382
383static int mpc512x_psc_tx_rdy(struct uart_port *port)
384{
385 return in_be32(&FIFO_512x(port)->txsr)
386 & in_be32(&FIFO_512x(port)->tximr)
387 & MPC512x_PSC_FIFO_ALARM;
388}
389
390static int mpc512x_psc_tx_empty(struct uart_port *port)
391{
392 return in_be32(&FIFO_512x(port)->txsr)
393 & MPC512x_PSC_FIFO_EMPTY;
394}
395
396static void mpc512x_psc_stop_rx(struct uart_port *port)
397{
398 unsigned long rx_fifo_imr;
399
400 rx_fifo_imr = in_be32(&FIFO_512x(port)->rximr);
401 rx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
402 out_be32(&FIFO_512x(port)->rximr, rx_fifo_imr);
403}
404
405static void mpc512x_psc_start_tx(struct uart_port *port)
406{
407 unsigned long tx_fifo_imr;
408
409 tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
410 tx_fifo_imr |= MPC512x_PSC_FIFO_ALARM;
411 out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
412}
413
414static void mpc512x_psc_stop_tx(struct uart_port *port)
415{
416 unsigned long tx_fifo_imr;
417
418 tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
419 tx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
420 out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
421}
422
423static void mpc512x_psc_rx_clr_irq(struct uart_port *port)
424{
425 out_be32(&FIFO_512x(port)->rxisr, in_be32(&FIFO_512x(port)->rxisr));
426}
427
428static void mpc512x_psc_tx_clr_irq(struct uart_port *port)
429{
430 out_be32(&FIFO_512x(port)->txisr, in_be32(&FIFO_512x(port)->txisr));
431}
432
433static void mpc512x_psc_write_char(struct uart_port *port, unsigned char c)
434{
435 out_8(&FIFO_512x(port)->txdata_8, c);
436}
437
438static unsigned char mpc512x_psc_read_char(struct uart_port *port)
439{
440 return in_8(&FIFO_512x(port)->rxdata_8);
441}
442
443static void mpc512x_psc_cw_disable_ints(struct uart_port *port)
444{
445 port->read_status_mask =
446 in_be32(&FIFO_512x(port)->tximr) << 16 |
447 in_be32(&FIFO_512x(port)->rximr);
448 out_be32(&FIFO_512x(port)->tximr, 0);
449 out_be32(&FIFO_512x(port)->rximr, 0);
450}
451
452static void mpc512x_psc_cw_restore_ints(struct uart_port *port)
453{
454 out_be32(&FIFO_512x(port)->tximr,
455 (port->read_status_mask >> 16) & 0x7f);
456 out_be32(&FIFO_512x(port)->rximr, port->read_status_mask & 0x7f);
457}
458
459static unsigned int mpc512x_psc_set_baudrate(struct uart_port *port,
460 struct ktermios *new,
461 struct ktermios *old)
462{
463 unsigned int baud;
464 unsigned int divisor;
465
466 /*
467 * The "MPC5121e Microcontroller Reference Manual, Rev. 3" says on
468 * pg. 30-10 that the chip supports a /32 and a /10 prescaler.
469 * Furthermore, it states that "After reset, the prescaler by 10
470 * for the UART mode is selected", but the reset register value is
471 * 0x0000 which means a /32 prescaler. This is wrong.
472 *
473 * In reality using /32 prescaler doesn't work, as it is not supported!
474 * Use /16 or /10 prescaler, see "MPC5121e Hardware Design Guide",
475 * Chapter 4.1 PSC in UART Mode.
476 * Calculate with a /16 prescaler here.
477 */
478
479 /* uartclk contains the ips freq */
480 baud = uart_get_baud_rate(port, new, old,
481 port->uartclk / (16 * 0xffff) + 1,
482 port->uartclk / 16);
483 divisor = (port->uartclk + 8 * baud) / (16 * baud);
484
485 /* enable the /16 prescaler and set the divisor */
486 mpc52xx_set_divisor(PSC(port), 0xdd00, divisor);
487 return baud;
488}
489
490/* Init PSC FIFO Controller */
491static int __init mpc512x_psc_fifoc_init(void)
492{
493 struct device_node *np;
494
495 np = of_find_compatible_node(NULL, NULL,
496 "fsl,mpc5121-psc-fifo");
497 if (!np) {
498 pr_err("%s: Can't find FIFOC node\n", __func__);
499 return -ENODEV;
500 }
501
502 psc_fifoc = of_iomap(np, 0);
503 if (!psc_fifoc) {
504 pr_err("%s: Can't map FIFOC\n", __func__);
505 of_node_put(np);
506 return -ENODEV;
507 }
508
509 psc_fifoc_irq = irq_of_parse_and_map(np, 0);
510 of_node_put(np);
511 if (psc_fifoc_irq == 0) {
512 pr_err("%s: Can't get FIFOC irq\n", __func__);
513 iounmap(psc_fifoc);
514 return -ENODEV;
515 }
516
517 return 0;
518}
519
520static void __exit mpc512x_psc_fifoc_uninit(void)
521{
522 iounmap(psc_fifoc);
523}
524
525/* 512x specific interrupt handler. The caller holds the port lock */
526static irqreturn_t mpc512x_psc_handle_irq(struct uart_port *port)
527{
528 unsigned long fifoc_int;
529 int psc_num;
530
531 /* Read pending PSC FIFOC interrupts */
532 fifoc_int = in_be32(&psc_fifoc->fifoc_int);
533
534 /* Check if it is an interrupt for this port */
535 psc_num = (port->mapbase & 0xf00) >> 8;
536 if (test_bit(psc_num, &fifoc_int) ||
537 test_bit(psc_num + 16, &fifoc_int))
538 return mpc5xxx_uart_process_int(port);
539
540 return IRQ_NONE;
541}
542
543static int mpc512x_psc_clock(struct uart_port *port, int enable)
544{
545 struct clk *psc_clk;
546 int psc_num;
547 char clk_name[10];
548
549 if (uart_console(port))
550 return 0;
551
552 psc_num = (port->mapbase & 0xf00) >> 8;
553 snprintf(clk_name, sizeof(clk_name), "psc%d_clk", psc_num);
554 psc_clk = clk_get(port->dev, clk_name);
555 if (IS_ERR(psc_clk)) {
556 dev_err(port->dev, "Failed to get PSC clock entry!\n");
557 return -ENODEV;
558 }
559
560 dev_dbg(port->dev, "%s %sable\n", clk_name, enable ? "en" : "dis");
561
562 if (enable)
563 clk_enable(psc_clk);
564 else
565 clk_disable(psc_clk);
566
567 return 0;
568}
569
570static void mpc512x_psc_get_irq(struct uart_port *port, struct device_node *np)
571{
572 port->irqflags = IRQF_SHARED;
573 port->irq = psc_fifoc_irq;
574}
575
576static struct psc_ops mpc512x_psc_ops = {
577 .fifo_init = mpc512x_psc_fifo_init,
578 .raw_rx_rdy = mpc512x_psc_raw_rx_rdy,
579 .raw_tx_rdy = mpc512x_psc_raw_tx_rdy,
580 .rx_rdy = mpc512x_psc_rx_rdy,
581 .tx_rdy = mpc512x_psc_tx_rdy,
582 .tx_empty = mpc512x_psc_tx_empty,
583 .stop_rx = mpc512x_psc_stop_rx,
584 .start_tx = mpc512x_psc_start_tx,
585 .stop_tx = mpc512x_psc_stop_tx,
586 .rx_clr_irq = mpc512x_psc_rx_clr_irq,
587 .tx_clr_irq = mpc512x_psc_tx_clr_irq,
588 .write_char = mpc512x_psc_write_char,
589 .read_char = mpc512x_psc_read_char,
590 .cw_disable_ints = mpc512x_psc_cw_disable_ints,
591 .cw_restore_ints = mpc512x_psc_cw_restore_ints,
592 .set_baudrate = mpc512x_psc_set_baudrate,
593 .clock = mpc512x_psc_clock,
594 .fifoc_init = mpc512x_psc_fifoc_init,
595 .fifoc_uninit = mpc512x_psc_fifoc_uninit,
596 .get_irq = mpc512x_psc_get_irq,
597 .handle_irq = mpc512x_psc_handle_irq,
598};
599#endif
600
601static struct psc_ops *psc_ops;
602
603/* ======================================================================== */
604/* UART operations */
605/* ======================================================================== */
606
607static unsigned int
608mpc52xx_uart_tx_empty(struct uart_port *port)
609{
610 return psc_ops->tx_empty(port) ? TIOCSER_TEMT : 0;
611}
612
613static void
614mpc52xx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
615{
616 if (mctrl & TIOCM_RTS)
617 out_8(&PSC(port)->op1, MPC52xx_PSC_OP_RTS);
618 else
619 out_8(&PSC(port)->op0, MPC52xx_PSC_OP_RTS);
620}
621
622static unsigned int
623mpc52xx_uart_get_mctrl(struct uart_port *port)
624{
625 unsigned int ret = TIOCM_DSR;
626 u8 status = in_8(&PSC(port)->mpc52xx_psc_ipcr);
627
628 if (!(status & MPC52xx_PSC_CTS))
629 ret |= TIOCM_CTS;
630 if (!(status & MPC52xx_PSC_DCD))
631 ret |= TIOCM_CAR;
632
633 return ret;
634}
635
636static void
637mpc52xx_uart_stop_tx(struct uart_port *port)
638{
639 /* port->lock taken by caller */
640 psc_ops->stop_tx(port);
641}
642
643static void
644mpc52xx_uart_start_tx(struct uart_port *port)
645{
646 /* port->lock taken by caller */
647 psc_ops->start_tx(port);
648}
649
650static void
651mpc52xx_uart_send_xchar(struct uart_port *port, char ch)
652{
653 unsigned long flags;
654 spin_lock_irqsave(&port->lock, flags);
655
656 port->x_char = ch;
657 if (ch) {
658 /* Make sure tx interrupts are on */
659 /* Truly necessary ??? They should be anyway */
660 psc_ops->start_tx(port);
661 }
662
663 spin_unlock_irqrestore(&port->lock, flags);
664}
665
666static void
667mpc52xx_uart_stop_rx(struct uart_port *port)
668{
669 /* port->lock taken by caller */
670 psc_ops->stop_rx(port);
671}
672
673static void
674mpc52xx_uart_enable_ms(struct uart_port *port)
675{
676 struct mpc52xx_psc __iomem *psc = PSC(port);
677
678 /* clear D_*-bits by reading them */
679 in_8(&psc->mpc52xx_psc_ipcr);
680 /* enable CTS and DCD as IPC interrupts */
681 out_8(&psc->mpc52xx_psc_acr, MPC52xx_PSC_IEC_CTS | MPC52xx_PSC_IEC_DCD);
682
683 port->read_status_mask |= MPC52xx_PSC_IMR_IPC;
684 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
685}
686
687static void
688mpc52xx_uart_break_ctl(struct uart_port *port, int ctl)
689{
690 unsigned long flags;
691 spin_lock_irqsave(&port->lock, flags);
692
693 if (ctl == -1)
694 out_8(&PSC(port)->command, MPC52xx_PSC_START_BRK);
695 else
696 out_8(&PSC(port)->command, MPC52xx_PSC_STOP_BRK);
697
698 spin_unlock_irqrestore(&port->lock, flags);
699}
700
701static int
702mpc52xx_uart_startup(struct uart_port *port)
703{
704 struct mpc52xx_psc __iomem *psc = PSC(port);
705 int ret;
706
707 if (psc_ops->clock) {
708 ret = psc_ops->clock(port, 1);
709 if (ret)
710 return ret;
711 }
712
713 /* Request IRQ */
714 ret = request_irq(port->irq, mpc52xx_uart_int,
715 port->irqflags, "mpc52xx_psc_uart", port);
716 if (ret)
717 return ret;
718
719 /* Reset/activate the port, clear and enable interrupts */
720 out_8(&psc->command, MPC52xx_PSC_RST_RX);
721 out_8(&psc->command, MPC52xx_PSC_RST_TX);
722
723 out_be32(&psc->sicr, 0); /* UART mode DCD ignored */
724
725 psc_ops->fifo_init(port);
726
727 out_8(&psc->command, MPC52xx_PSC_TX_ENABLE);
728 out_8(&psc->command, MPC52xx_PSC_RX_ENABLE);
729
730 return 0;
731}
732
733static void
734mpc52xx_uart_shutdown(struct uart_port *port)
735{
736 struct mpc52xx_psc __iomem *psc = PSC(port);
737
738 /* Shut down the port. Leave TX active if on a console port */
739 out_8(&psc->command, MPC52xx_PSC_RST_RX);
740 if (!uart_console(port))
741 out_8(&psc->command, MPC52xx_PSC_RST_TX);
742
743 port->read_status_mask = 0;
744 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
745
746 if (psc_ops->clock)
747 psc_ops->clock(port, 0);
748
749 /* Release interrupt */
750 free_irq(port->irq, port);
751}
752
753static void
754mpc52xx_uart_set_termios(struct uart_port *port, struct ktermios *new,
755 struct ktermios *old)
756{
757 struct mpc52xx_psc __iomem *psc = PSC(port);
758 unsigned long flags;
759 unsigned char mr1, mr2;
760 unsigned int j;
761 unsigned int baud;
762
763 /* Prepare what we're gonna write */
764 mr1 = 0;
765
766 switch (new->c_cflag & CSIZE) {
767 case CS5: mr1 |= MPC52xx_PSC_MODE_5_BITS;
768 break;
769 case CS6: mr1 |= MPC52xx_PSC_MODE_6_BITS;
770 break;
771 case CS7: mr1 |= MPC52xx_PSC_MODE_7_BITS;
772 break;
773 case CS8:
774 default: mr1 |= MPC52xx_PSC_MODE_8_BITS;
775 }
776
777 if (new->c_cflag & PARENB) {
778 mr1 |= (new->c_cflag & PARODD) ?
779 MPC52xx_PSC_MODE_PARODD : MPC52xx_PSC_MODE_PAREVEN;
780 } else
781 mr1 |= MPC52xx_PSC_MODE_PARNONE;
782
783
784 mr2 = 0;
785
786 if (new->c_cflag & CSTOPB)
787 mr2 |= MPC52xx_PSC_MODE_TWO_STOP;
788 else
789 mr2 |= ((new->c_cflag & CSIZE) == CS5) ?
790 MPC52xx_PSC_MODE_ONE_STOP_5_BITS :
791 MPC52xx_PSC_MODE_ONE_STOP;
792
793 if (new->c_cflag & CRTSCTS) {
794 mr1 |= MPC52xx_PSC_MODE_RXRTS;
795 mr2 |= MPC52xx_PSC_MODE_TXCTS;
796 }
797
798 /* Get the lock */
799 spin_lock_irqsave(&port->lock, flags);
800
801 /* Do our best to flush TX & RX, so we don't lose anything */
802 /* But we don't wait indefinitely ! */
803 j = 5000000; /* Maximum wait */
804 /* FIXME Can't receive chars since set_termios might be called at early
805 * boot for the console, all stuff is not yet ready to receive at that
806 * time and that just makes the kernel oops */
807 /* while (j-- && mpc52xx_uart_int_rx_chars(port)); */
808 while (!mpc52xx_uart_tx_empty(port) && --j)
809 udelay(1);
810
811 if (!j)
812 printk(KERN_ERR "mpc52xx_uart.c: "
813 "Unable to flush RX & TX fifos in-time in set_termios."
814 "Some chars may have been lost.\n");
815
816 /* Reset the TX & RX */
817 out_8(&psc->command, MPC52xx_PSC_RST_RX);
818 out_8(&psc->command, MPC52xx_PSC_RST_TX);
819
820 /* Send new mode settings */
821 out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
822 out_8(&psc->mode, mr1);
823 out_8(&psc->mode, mr2);
824 baud = psc_ops->set_baudrate(port, new, old);
825
826 /* Update the per-port timeout */
827 uart_update_timeout(port, new->c_cflag, baud);
828
829 if (UART_ENABLE_MS(port, new->c_cflag))
830 mpc52xx_uart_enable_ms(port);
831
832 /* Reenable TX & RX */
833 out_8(&psc->command, MPC52xx_PSC_TX_ENABLE);
834 out_8(&psc->command, MPC52xx_PSC_RX_ENABLE);
835
836 /* We're all set, release the lock */
837 spin_unlock_irqrestore(&port->lock, flags);
838}
839
840static const char *
841mpc52xx_uart_type(struct uart_port *port)
842{
843 /*
844 * We keep using PORT_MPC52xx for historic reasons although it applies
845 * for MPC512x, too, but print "MPC5xxx" to not irritate users
846 */
847 return port->type == PORT_MPC52xx ? "MPC5xxx PSC" : NULL;
848}
849
850static void
851mpc52xx_uart_release_port(struct uart_port *port)
852{
853 /* remapped by us ? */
854 if (port->flags & UPF_IOREMAP) {
855 iounmap(port->membase);
856 port->membase = NULL;
857 }
858
859 release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc));
860}
861
862static int
863mpc52xx_uart_request_port(struct uart_port *port)
864{
865 int err;
866
867 if (port->flags & UPF_IOREMAP) /* Need to remap ? */
868 port->membase = ioremap(port->mapbase,
869 sizeof(struct mpc52xx_psc));
870
871 if (!port->membase)
872 return -EINVAL;
873
874 err = request_mem_region(port->mapbase, sizeof(struct mpc52xx_psc),
875 "mpc52xx_psc_uart") != NULL ? 0 : -EBUSY;
876
877 if (err && (port->flags & UPF_IOREMAP)) {
878 iounmap(port->membase);
879 port->membase = NULL;
880 }
881
882 return err;
883}
884
885static void
886mpc52xx_uart_config_port(struct uart_port *port, int flags)
887{
888 if ((flags & UART_CONFIG_TYPE)
889 && (mpc52xx_uart_request_port(port) == 0))
890 port->type = PORT_MPC52xx;
891}
892
893static int
894mpc52xx_uart_verify_port(struct uart_port *port, struct serial_struct *ser)
895{
896 if (ser->type != PORT_UNKNOWN && ser->type != PORT_MPC52xx)
897 return -EINVAL;
898
899 if ((ser->irq != port->irq) ||
900 (ser->io_type != UPIO_MEM) ||
901 (ser->baud_base != port->uartclk) ||
902 (ser->iomem_base != (void *)port->mapbase) ||
903 (ser->hub6 != 0))
904 return -EINVAL;
905
906 return 0;
907}
908
909
910static struct uart_ops mpc52xx_uart_ops = {
911 .tx_empty = mpc52xx_uart_tx_empty,
912 .set_mctrl = mpc52xx_uart_set_mctrl,
913 .get_mctrl = mpc52xx_uart_get_mctrl,
914 .stop_tx = mpc52xx_uart_stop_tx,
915 .start_tx = mpc52xx_uart_start_tx,
916 .send_xchar = mpc52xx_uart_send_xchar,
917 .stop_rx = mpc52xx_uart_stop_rx,
918 .enable_ms = mpc52xx_uart_enable_ms,
919 .break_ctl = mpc52xx_uart_break_ctl,
920 .startup = mpc52xx_uart_startup,
921 .shutdown = mpc52xx_uart_shutdown,
922 .set_termios = mpc52xx_uart_set_termios,
923/* .pm = mpc52xx_uart_pm, Not supported yet */
924/* .set_wake = mpc52xx_uart_set_wake, Not supported yet */
925 .type = mpc52xx_uart_type,
926 .release_port = mpc52xx_uart_release_port,
927 .request_port = mpc52xx_uart_request_port,
928 .config_port = mpc52xx_uart_config_port,
929 .verify_port = mpc52xx_uart_verify_port
930};
931
932
933/* ======================================================================== */
934/* Interrupt handling */
935/* ======================================================================== */
936
937static inline int
938mpc52xx_uart_int_rx_chars(struct uart_port *port)
939{
940 struct tty_struct *tty = port->state->port.tty;
941 unsigned char ch, flag;
942 unsigned short status;
943
944 /* While we can read, do so ! */
945 while (psc_ops->raw_rx_rdy(port)) {
946 /* Get the char */
947 ch = psc_ops->read_char(port);
948
949 /* Handle sysreq char */
950#ifdef SUPPORT_SYSRQ
951 if (uart_handle_sysrq_char(port, ch)) {
952 port->sysrq = 0;
953 continue;
954 }
955#endif
956
957 /* Store it */
958
959 flag = TTY_NORMAL;
960 port->icount.rx++;
961
962 status = in_be16(&PSC(port)->mpc52xx_psc_status);
963
964 if (status & (MPC52xx_PSC_SR_PE |
965 MPC52xx_PSC_SR_FE |
966 MPC52xx_PSC_SR_RB)) {
967
968 if (status & MPC52xx_PSC_SR_RB) {
969 flag = TTY_BREAK;
970 uart_handle_break(port);
971 port->icount.brk++;
972 } else if (status & MPC52xx_PSC_SR_PE) {
973 flag = TTY_PARITY;
974 port->icount.parity++;
975 }
976 else if (status & MPC52xx_PSC_SR_FE) {
977 flag = TTY_FRAME;
978 port->icount.frame++;
979 }
980
981 /* Clear error condition */
982 out_8(&PSC(port)->command, MPC52xx_PSC_RST_ERR_STAT);
983
984 }
985 tty_insert_flip_char(tty, ch, flag);
986 if (status & MPC52xx_PSC_SR_OE) {
987 /*
988 * Overrun is special, since it's
989 * reported immediately, and doesn't
990 * affect the current character
991 */
992 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
993 port->icount.overrun++;
994 }
995 }
996
997 spin_unlock(&port->lock);
998 tty_flip_buffer_push(tty);
999 spin_lock(&port->lock);
1000
1001 return psc_ops->raw_rx_rdy(port);
1002}
1003
1004static inline int
1005mpc52xx_uart_int_tx_chars(struct uart_port *port)
1006{
1007 struct circ_buf *xmit = &port->state->xmit;
1008
1009 /* Process out of band chars */
1010 if (port->x_char) {
1011 psc_ops->write_char(port, port->x_char);
1012 port->icount.tx++;
1013 port->x_char = 0;
1014 return 1;
1015 }
1016
1017 /* Nothing to do ? */
1018 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
1019 mpc52xx_uart_stop_tx(port);
1020 return 0;
1021 }
1022
1023 /* Send chars */
1024 while (psc_ops->raw_tx_rdy(port)) {
1025 psc_ops->write_char(port, xmit->buf[xmit->tail]);
1026 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
1027 port->icount.tx++;
1028 if (uart_circ_empty(xmit))
1029 break;
1030 }
1031
1032 /* Wake up */
1033 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
1034 uart_write_wakeup(port);
1035
1036 /* Maybe we're done after all */
1037 if (uart_circ_empty(xmit)) {
1038 mpc52xx_uart_stop_tx(port);
1039 return 0;
1040 }
1041
1042 return 1;
1043}
1044
1045static irqreturn_t
1046mpc5xxx_uart_process_int(struct uart_port *port)
1047{
1048 unsigned long pass = ISR_PASS_LIMIT;
1049 unsigned int keepgoing;
1050 u8 status;
1051
1052 /* While we have stuff to do, we continue */
1053 do {
1054 /* If we don't find anything to do, we stop */
1055 keepgoing = 0;
1056
1057 psc_ops->rx_clr_irq(port);
1058 if (psc_ops->rx_rdy(port))
1059 keepgoing |= mpc52xx_uart_int_rx_chars(port);
1060
1061 psc_ops->tx_clr_irq(port);
1062 if (psc_ops->tx_rdy(port))
1063 keepgoing |= mpc52xx_uart_int_tx_chars(port);
1064
1065 status = in_8(&PSC(port)->mpc52xx_psc_ipcr);
1066 if (status & MPC52xx_PSC_D_DCD)
1067 uart_handle_dcd_change(port, !(status & MPC52xx_PSC_DCD));
1068
1069 if (status & MPC52xx_PSC_D_CTS)
1070 uart_handle_cts_change(port, !(status & MPC52xx_PSC_CTS));
1071
1072 /* Limit number of iteration */
1073 if (!(--pass))
1074 keepgoing = 0;
1075
1076 } while (keepgoing);
1077
1078 return IRQ_HANDLED;
1079}
1080
1081static irqreturn_t
1082mpc52xx_uart_int(int irq, void *dev_id)
1083{
1084 struct uart_port *port = dev_id;
1085 irqreturn_t ret;
1086
1087 spin_lock(&port->lock);
1088
1089 ret = psc_ops->handle_irq(port);
1090
1091 spin_unlock(&port->lock);
1092
1093 return ret;
1094}
1095
1096/* ======================================================================== */
1097/* Console ( if applicable ) */
1098/* ======================================================================== */
1099
1100#ifdef CONFIG_SERIAL_MPC52xx_CONSOLE
1101
1102static void __init
1103mpc52xx_console_get_options(struct uart_port *port,
1104 int *baud, int *parity, int *bits, int *flow)
1105{
1106 struct mpc52xx_psc __iomem *psc = PSC(port);
1107 unsigned char mr1;
1108
1109 pr_debug("mpc52xx_console_get_options(port=%p)\n", port);
1110
1111 /* Read the mode registers */
1112 out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
1113 mr1 = in_8(&psc->mode);
1114
1115 /* CT{U,L}R are write-only ! */
1116 *baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
1117
1118 /* Parse them */
1119 switch (mr1 & MPC52xx_PSC_MODE_BITS_MASK) {
1120 case MPC52xx_PSC_MODE_5_BITS:
1121 *bits = 5;
1122 break;
1123 case MPC52xx_PSC_MODE_6_BITS:
1124 *bits = 6;
1125 break;
1126 case MPC52xx_PSC_MODE_7_BITS:
1127 *bits = 7;
1128 break;
1129 case MPC52xx_PSC_MODE_8_BITS:
1130 default:
1131 *bits = 8;
1132 }
1133
1134 if (mr1 & MPC52xx_PSC_MODE_PARNONE)
1135 *parity = 'n';
1136 else
1137 *parity = mr1 & MPC52xx_PSC_MODE_PARODD ? 'o' : 'e';
1138}
1139
1140static void
1141mpc52xx_console_write(struct console *co, const char *s, unsigned int count)
1142{
1143 struct uart_port *port = &mpc52xx_uart_ports[co->index];
1144 unsigned int i, j;
1145
1146 /* Disable interrupts */
1147 psc_ops->cw_disable_ints(port);
1148
1149 /* Wait the TX buffer to be empty */
1150 j = 5000000; /* Maximum wait */
1151 while (!mpc52xx_uart_tx_empty(port) && --j)
1152 udelay(1);
1153
1154 /* Write all the chars */
1155 for (i = 0; i < count; i++, s++) {
1156 /* Line return handling */
1157 if (*s == '\n')
1158 psc_ops->write_char(port, '\r');
1159
1160 /* Send the char */
1161 psc_ops->write_char(port, *s);
1162
1163 /* Wait the TX buffer to be empty */
1164 j = 20000; /* Maximum wait */
1165 while (!mpc52xx_uart_tx_empty(port) && --j)
1166 udelay(1);
1167 }
1168
1169 /* Restore interrupt state */
1170 psc_ops->cw_restore_ints(port);
1171}
1172
1173
1174static int __init
1175mpc52xx_console_setup(struct console *co, char *options)
1176{
1177 struct uart_port *port = &mpc52xx_uart_ports[co->index];
1178 struct device_node *np = mpc52xx_uart_nodes[co->index];
1179 unsigned int uartclk;
1180 struct resource res;
1181 int ret;
1182
1183 int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
1184 int bits = 8;
1185 int parity = 'n';
1186 int flow = 'n';
1187
1188 pr_debug("mpc52xx_console_setup co=%p, co->index=%i, options=%s\n",
1189 co, co->index, options);
1190
1191 if ((co->index < 0) || (co->index >= MPC52xx_PSC_MAXNUM)) {
1192 pr_debug("PSC%x out of range\n", co->index);
1193 return -EINVAL;
1194 }
1195
1196 if (!np) {
1197 pr_debug("PSC%x not found in device tree\n", co->index);
1198 return -EINVAL;
1199 }
1200
1201 pr_debug("Console on ttyPSC%x is %s\n",
1202 co->index, mpc52xx_uart_nodes[co->index]->full_name);
1203
1204 /* Fetch register locations */
1205 ret = of_address_to_resource(np, 0, &res);
1206 if (ret) {
1207 pr_debug("Could not get resources for PSC%x\n", co->index);
1208 return ret;
1209 }
1210
1211 uartclk = mpc5xxx_get_bus_frequency(np);
1212 if (uartclk == 0) {
1213 pr_debug("Could not find uart clock frequency!\n");
1214 return -EINVAL;
1215 }
1216
1217 /* Basic port init. Needed since we use some uart_??? func before
1218 * real init for early access */
1219 spin_lock_init(&port->lock);
1220 port->uartclk = uartclk;
1221 port->ops = &mpc52xx_uart_ops;
1222 port->mapbase = res.start;
1223 port->membase = ioremap(res.start, sizeof(struct mpc52xx_psc));
1224 port->irq = irq_of_parse_and_map(np, 0);
1225
1226 if (port->membase == NULL)
1227 return -EINVAL;
1228
1229 pr_debug("mpc52xx-psc uart at %p, mapped to %p, irq=%x, freq=%i\n",
1230 (void *)port->mapbase, port->membase,
1231 port->irq, port->uartclk);
1232
1233 /* Setup the port parameters accoding to options */
1234 if (options)
1235 uart_parse_options(options, &baud, &parity, &bits, &flow);
1236 else
1237 mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow);
1238
1239 pr_debug("Setting console parameters: %i %i%c1 flow=%c\n",
1240 baud, bits, parity, flow);
1241
1242 return uart_set_options(port, co, baud, parity, bits, flow);
1243}
1244
1245
1246static struct uart_driver mpc52xx_uart_driver;
1247
1248static struct console mpc52xx_console = {
1249 .name = "ttyPSC",
1250 .write = mpc52xx_console_write,
1251 .device = uart_console_device,
1252 .setup = mpc52xx_console_setup,
1253 .flags = CON_PRINTBUFFER,
1254 .index = -1, /* Specified on the cmdline (e.g. console=ttyPSC0) */
1255 .data = &mpc52xx_uart_driver,
1256};
1257
1258
1259static int __init
1260mpc52xx_console_init(void)
1261{
1262 mpc52xx_uart_of_enumerate();
1263 register_console(&mpc52xx_console);
1264 return 0;
1265}
1266
1267console_initcall(mpc52xx_console_init);
1268
1269#define MPC52xx_PSC_CONSOLE &mpc52xx_console
1270#else
1271#define MPC52xx_PSC_CONSOLE NULL
1272#endif
1273
1274
1275/* ======================================================================== */
1276/* UART Driver */
1277/* ======================================================================== */
1278
1279static struct uart_driver mpc52xx_uart_driver = {
1280 .driver_name = "mpc52xx_psc_uart",
1281 .dev_name = "ttyPSC",
1282 .major = SERIAL_PSC_MAJOR,
1283 .minor = SERIAL_PSC_MINOR,
1284 .nr = MPC52xx_PSC_MAXNUM,
1285 .cons = MPC52xx_PSC_CONSOLE,
1286};
1287
1288/* ======================================================================== */
1289/* OF Platform Driver */
1290/* ======================================================================== */
1291
1292static struct of_device_id mpc52xx_uart_of_match[] = {
1293#ifdef CONFIG_PPC_MPC52xx
1294 { .compatible = "fsl,mpc5200b-psc-uart", .data = &mpc5200b_psc_ops, },
1295 { .compatible = "fsl,mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
1296 /* binding used by old lite5200 device trees: */
1297 { .compatible = "mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
1298 /* binding used by efika: */
1299 { .compatible = "mpc5200-serial", .data = &mpc52xx_psc_ops, },
1300#endif
1301#ifdef CONFIG_PPC_MPC512x
1302 { .compatible = "fsl,mpc5121-psc-uart", .data = &mpc512x_psc_ops, },
1303#endif
1304 {},
1305};
1306
1307static int __devinit mpc52xx_uart_of_probe(struct platform_device *op)
1308{
1309 int idx = -1;
1310 unsigned int uartclk;
1311 struct uart_port *port = NULL;
1312 struct resource res;
1313 int ret;
1314
1315 /* Check validity & presence */
1316 for (idx = 0; idx < MPC52xx_PSC_MAXNUM; idx++)
1317 if (mpc52xx_uart_nodes[idx] == op->dev.of_node)
1318 break;
1319 if (idx >= MPC52xx_PSC_MAXNUM)
1320 return -EINVAL;
1321 pr_debug("Found %s assigned to ttyPSC%x\n",
1322 mpc52xx_uart_nodes[idx]->full_name, idx);
1323
1324 /* set the uart clock to the input clock of the psc, the different
1325 * prescalers are taken into account in the set_baudrate() methods
1326 * of the respective chip */
1327 uartclk = mpc5xxx_get_bus_frequency(op->dev.of_node);
1328 if (uartclk == 0) {
1329 dev_dbg(&op->dev, "Could not find uart clock frequency!\n");
1330 return -EINVAL;
1331 }
1332
1333 /* Init the port structure */
1334 port = &mpc52xx_uart_ports[idx];
1335
1336 spin_lock_init(&port->lock);
1337 port->uartclk = uartclk;
1338 port->fifosize = 512;
1339 port->iotype = UPIO_MEM;
1340 port->flags = UPF_BOOT_AUTOCONF |
1341 (uart_console(port) ? 0 : UPF_IOREMAP);
1342 port->line = idx;
1343 port->ops = &mpc52xx_uart_ops;
1344 port->dev = &op->dev;
1345
1346 /* Search for IRQ and mapbase */
1347 ret = of_address_to_resource(op->dev.of_node, 0, &res);
1348 if (ret)
1349 return ret;
1350
1351 port->mapbase = res.start;
1352 if (!port->mapbase) {
1353 dev_dbg(&op->dev, "Could not allocate resources for PSC\n");
1354 return -EINVAL;
1355 }
1356
1357 psc_ops->get_irq(port, op->dev.of_node);
1358 if (port->irq == 0) {
1359 dev_dbg(&op->dev, "Could not get irq\n");
1360 return -EINVAL;
1361 }
1362
1363 dev_dbg(&op->dev, "mpc52xx-psc uart at %p, irq=%x, freq=%i\n",
1364 (void *)port->mapbase, port->irq, port->uartclk);
1365
1366 /* Add the port to the uart sub-system */
1367 ret = uart_add_one_port(&mpc52xx_uart_driver, port);
1368 if (ret)
1369 return ret;
1370
1371 dev_set_drvdata(&op->dev, (void *)port);
1372 return 0;
1373}
1374
1375static int
1376mpc52xx_uart_of_remove(struct platform_device *op)
1377{
1378 struct uart_port *port = dev_get_drvdata(&op->dev);
1379 dev_set_drvdata(&op->dev, NULL);
1380
1381 if (port)
1382 uart_remove_one_port(&mpc52xx_uart_driver, port);
1383
1384 return 0;
1385}
1386
1387#ifdef CONFIG_PM
1388static int
1389mpc52xx_uart_of_suspend(struct platform_device *op, pm_message_t state)
1390{
1391 struct uart_port *port = (struct uart_port *) dev_get_drvdata(&op->dev);
1392
1393 if (port)
1394 uart_suspend_port(&mpc52xx_uart_driver, port);
1395
1396 return 0;
1397}
1398
1399static int
1400mpc52xx_uart_of_resume(struct platform_device *op)
1401{
1402 struct uart_port *port = (struct uart_port *) dev_get_drvdata(&op->dev);
1403
1404 if (port)
1405 uart_resume_port(&mpc52xx_uart_driver, port);
1406
1407 return 0;
1408}
1409#endif
1410
1411static void
1412mpc52xx_uart_of_assign(struct device_node *np)
1413{
1414 int i;
1415
1416 /* Find the first free PSC number */
1417 for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
1418 if (mpc52xx_uart_nodes[i] == NULL) {
1419 of_node_get(np);
1420 mpc52xx_uart_nodes[i] = np;
1421 return;
1422 }
1423 }
1424}
1425
1426static void
1427mpc52xx_uart_of_enumerate(void)
1428{
1429 static int enum_done;
1430 struct device_node *np;
1431 const struct of_device_id *match;
1432 int i;
1433
1434 if (enum_done)
1435 return;
1436
1437 /* Assign index to each PSC in device tree */
1438 for_each_matching_node(np, mpc52xx_uart_of_match) {
1439 match = of_match_node(mpc52xx_uart_of_match, np);
1440 psc_ops = match->data;
1441 mpc52xx_uart_of_assign(np);
1442 }
1443
1444 enum_done = 1;
1445
1446 for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
1447 if (mpc52xx_uart_nodes[i])
1448 pr_debug("%s assigned to ttyPSC%x\n",
1449 mpc52xx_uart_nodes[i]->full_name, i);
1450 }
1451}
1452
1453MODULE_DEVICE_TABLE(of, mpc52xx_uart_of_match);
1454
1455static struct platform_driver mpc52xx_uart_of_driver = {
1456 .probe = mpc52xx_uart_of_probe,
1457 .remove = mpc52xx_uart_of_remove,
1458#ifdef CONFIG_PM
1459 .suspend = mpc52xx_uart_of_suspend,
1460 .resume = mpc52xx_uart_of_resume,
1461#endif
1462 .driver = {
1463 .name = "mpc52xx-psc-uart",
1464 .owner = THIS_MODULE,
1465 .of_match_table = mpc52xx_uart_of_match,
1466 },
1467};
1468
1469
1470/* ======================================================================== */
1471/* Module */
1472/* ======================================================================== */
1473
1474static int __init
1475mpc52xx_uart_init(void)
1476{
1477 int ret;
1478
1479 printk(KERN_INFO "Serial: MPC52xx PSC UART driver\n");
1480
1481 ret = uart_register_driver(&mpc52xx_uart_driver);
1482 if (ret) {
1483 printk(KERN_ERR "%s: uart_register_driver failed (%i)\n",
1484 __FILE__, ret);
1485 return ret;
1486 }
1487
1488 mpc52xx_uart_of_enumerate();
1489
1490 /*
1491 * Map the PSC FIFO Controller and init if on MPC512x.
1492 */
1493 if (psc_ops && psc_ops->fifoc_init) {
1494 ret = psc_ops->fifoc_init();
1495 if (ret)
1496 return ret;
1497 }
1498
1499 ret = platform_driver_register(&mpc52xx_uart_of_driver);
1500 if (ret) {
1501 printk(KERN_ERR "%s: platform_driver_register failed (%i)\n",
1502 __FILE__, ret);
1503 uart_unregister_driver(&mpc52xx_uart_driver);
1504 return ret;
1505 }
1506
1507 return 0;
1508}
1509
1510static void __exit
1511mpc52xx_uart_exit(void)
1512{
1513 if (psc_ops->fifoc_uninit)
1514 psc_ops->fifoc_uninit();
1515
1516 platform_driver_unregister(&mpc52xx_uart_of_driver);
1517 uart_unregister_driver(&mpc52xx_uart_driver);
1518}
1519
1520
1521module_init(mpc52xx_uart_init);
1522module_exit(mpc52xx_uart_exit);
1523
1524MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
1525MODULE_DESCRIPTION("Freescale MPC52xx PSC UART");
1526MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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