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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/serial.h>
38#include <linux/sysrq.h>
39#include <linux/console.h>
40#include <linux/delay.h>
41#include <linux/io.h>
42#include <linux/of.h>
43#include <linux/of_platform.h>
44#include <linux/clk.h>
45
46#include <asm/mpc52xx.h>
47#include <asm/mpc52xx_psc.h>
48
49#if defined(CONFIG_SERIAL_MPC52xx_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
50#define SUPPORT_SYSRQ
51#endif
52
53#include <linux/serial_core.h>
54
55
56/* We've been assigned a range on the "Low-density serial ports" major */
57#define SERIAL_PSC_MAJOR 204
58#define SERIAL_PSC_MINOR 148
59
60
61#define ISR_PASS_LIMIT 256 /* Max number of iteration in the interrupt */
62
63
64static struct uart_port mpc52xx_uart_ports[MPC52xx_PSC_MAXNUM];
65 /* Rem: - We use the read_status_mask as a shadow of
66 * psc->mpc52xx_psc_imr
67 * - It's important that is array is all zero on start as we
68 * use it to know if it's initialized or not ! If it's not sure
69 * it's cleared, then a memset(...,0,...) should be added to
70 * the console_init
71 */
72
73/* lookup table for matching device nodes to index numbers */
74static struct device_node *mpc52xx_uart_nodes[MPC52xx_PSC_MAXNUM];
75
76static void mpc52xx_uart_of_enumerate(void);
77
78
79#define PSC(port) ((struct mpc52xx_psc __iomem *)((port)->membase))
80
81
82/* Forward declaration of the interruption handling routine */
83static irqreturn_t mpc52xx_uart_int(int irq, void *dev_id);
84static irqreturn_t mpc5xxx_uart_process_int(struct uart_port *port);
85
86
87/* Simple macro to test if a port is console or not. This one is taken
88 * for serial_core.c and maybe should be moved to serial_core.h ? */
89#ifdef CONFIG_SERIAL_CORE_CONSOLE
90#define uart_console(port) \
91 ((port)->cons && (port)->cons->index == (port)->line)
92#else
93#define uart_console(port) (0)
94#endif
95
96/* ======================================================================== */
97/* PSC fifo operations for isolating differences between 52xx and 512x */
98/* ======================================================================== */
99
100struct psc_ops {
101 void (*fifo_init)(struct uart_port *port);
102 int (*raw_rx_rdy)(struct uart_port *port);
103 int (*raw_tx_rdy)(struct uart_port *port);
104 int (*rx_rdy)(struct uart_port *port);
105 int (*tx_rdy)(struct uart_port *port);
106 int (*tx_empty)(struct uart_port *port);
107 void (*stop_rx)(struct uart_port *port);
108 void (*start_tx)(struct uart_port *port);
109 void (*stop_tx)(struct uart_port *port);
110 void (*rx_clr_irq)(struct uart_port *port);
111 void (*tx_clr_irq)(struct uart_port *port);
112 void (*write_char)(struct uart_port *port, unsigned char c);
113 unsigned char (*read_char)(struct uart_port *port);
114 void (*cw_disable_ints)(struct uart_port *port);
115 void (*cw_restore_ints)(struct uart_port *port);
116 unsigned int (*set_baudrate)(struct uart_port *port,
117 struct ktermios *new,
118 struct ktermios *old);
119 int (*clock)(struct uart_port *port, int enable);
120 int (*fifoc_init)(void);
121 void (*fifoc_uninit)(void);
122 void (*get_irq)(struct uart_port *, struct device_node *);
123 irqreturn_t (*handle_irq)(struct uart_port *port);
124};
125
126/* setting the prescaler and divisor reg is common for all chips */
127static inline void mpc52xx_set_divisor(struct mpc52xx_psc __iomem *psc,
128 u16 prescaler, unsigned int divisor)
129{
130 /* select prescaler */
131 out_be16(&psc->mpc52xx_psc_clock_select, prescaler);
132 out_8(&psc->ctur, divisor >> 8);
133 out_8(&psc->ctlr, divisor & 0xff);
134}
135
136#ifdef CONFIG_PPC_MPC52xx
137#define FIFO_52xx(port) ((struct mpc52xx_psc_fifo __iomem *)(PSC(port)+1))
138static void mpc52xx_psc_fifo_init(struct uart_port *port)
139{
140 struct mpc52xx_psc __iomem *psc = PSC(port);
141 struct mpc52xx_psc_fifo __iomem *fifo = FIFO_52xx(port);
142
143 out_8(&fifo->rfcntl, 0x00);
144 out_be16(&fifo->rfalarm, 0x1ff);
145 out_8(&fifo->tfcntl, 0x07);
146 out_be16(&fifo->tfalarm, 0x80);
147
148 port->read_status_mask |= MPC52xx_PSC_IMR_RXRDY | MPC52xx_PSC_IMR_TXRDY;
149 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
150}
151
152static int mpc52xx_psc_raw_rx_rdy(struct uart_port *port)
153{
154 return in_be16(&PSC(port)->mpc52xx_psc_status)
155 & MPC52xx_PSC_SR_RXRDY;
156}
157
158static int mpc52xx_psc_raw_tx_rdy(struct uart_port *port)
159{
160 return in_be16(&PSC(port)->mpc52xx_psc_status)
161 & MPC52xx_PSC_SR_TXRDY;
162}
163
164
165static int mpc52xx_psc_rx_rdy(struct uart_port *port)
166{
167 return in_be16(&PSC(port)->mpc52xx_psc_isr)
168 & port->read_status_mask
169 & MPC52xx_PSC_IMR_RXRDY;
170}
171
172static int mpc52xx_psc_tx_rdy(struct uart_port *port)
173{
174 return in_be16(&PSC(port)->mpc52xx_psc_isr)
175 & port->read_status_mask
176 & MPC52xx_PSC_IMR_TXRDY;
177}
178
179static int mpc52xx_psc_tx_empty(struct uart_port *port)
180{
181 return in_be16(&PSC(port)->mpc52xx_psc_status)
182 & MPC52xx_PSC_SR_TXEMP;
183}
184
185static void mpc52xx_psc_start_tx(struct uart_port *port)
186{
187 port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY;
188 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
189}
190
191static void mpc52xx_psc_stop_tx(struct uart_port *port)
192{
193 port->read_status_mask &= ~MPC52xx_PSC_IMR_TXRDY;
194 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
195}
196
197static void mpc52xx_psc_stop_rx(struct uart_port *port)
198{
199 port->read_status_mask &= ~MPC52xx_PSC_IMR_RXRDY;
200 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
201}
202
203static void mpc52xx_psc_rx_clr_irq(struct uart_port *port)
204{
205}
206
207static void mpc52xx_psc_tx_clr_irq(struct uart_port *port)
208{
209}
210
211static void mpc52xx_psc_write_char(struct uart_port *port, unsigned char c)
212{
213 out_8(&PSC(port)->mpc52xx_psc_buffer_8, c);
214}
215
216static unsigned char mpc52xx_psc_read_char(struct uart_port *port)
217{
218 return in_8(&PSC(port)->mpc52xx_psc_buffer_8);
219}
220
221static void mpc52xx_psc_cw_disable_ints(struct uart_port *port)
222{
223 out_be16(&PSC(port)->mpc52xx_psc_imr, 0);
224}
225
226static void mpc52xx_psc_cw_restore_ints(struct uart_port *port)
227{
228 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
229}
230
231static unsigned int mpc5200_psc_set_baudrate(struct uart_port *port,
232 struct ktermios *new,
233 struct ktermios *old)
234{
235 unsigned int baud;
236 unsigned int divisor;
237
238 /* The 5200 has a fixed /32 prescaler, uartclk contains the ipb freq */
239 baud = uart_get_baud_rate(port, new, old,
240 port->uartclk / (32 * 0xffff) + 1,
241 port->uartclk / 32);
242 divisor = (port->uartclk + 16 * baud) / (32 * baud);
243
244 /* enable the /32 prescaler and set the divisor */
245 mpc52xx_set_divisor(PSC(port), 0xdd00, divisor);
246 return baud;
247}
248
249static unsigned int mpc5200b_psc_set_baudrate(struct uart_port *port,
250 struct ktermios *new,
251 struct ktermios *old)
252{
253 unsigned int baud;
254 unsigned int divisor;
255 u16 prescaler;
256
257 /* The 5200B has a selectable /4 or /32 prescaler, uartclk contains the
258 * ipb freq */
259 baud = uart_get_baud_rate(port, new, old,
260 port->uartclk / (32 * 0xffff) + 1,
261 port->uartclk / 4);
262 divisor = (port->uartclk + 2 * baud) / (4 * baud);
263
264 /* select the proper prescaler and set the divisor */
265 if (divisor > 0xffff) {
266 divisor = (divisor + 4) / 8;
267 prescaler = 0xdd00; /* /32 */
268 } else
269 prescaler = 0xff00; /* /4 */
270 mpc52xx_set_divisor(PSC(port), prescaler, divisor);
271 return baud;
272}
273
274static void mpc52xx_psc_get_irq(struct uart_port *port, struct device_node *np)
275{
276 port->irqflags = IRQF_DISABLED;
277 port->irq = irq_of_parse_and_map(np, 0);
278}
279
280/* 52xx specific interrupt handler. The caller holds the port lock */
281static irqreturn_t mpc52xx_psc_handle_irq(struct uart_port *port)
282{
283 return mpc5xxx_uart_process_int(port);
284}
285
286static struct psc_ops mpc52xx_psc_ops = {
287 .fifo_init = mpc52xx_psc_fifo_init,
288 .raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
289 .raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
290 .rx_rdy = mpc52xx_psc_rx_rdy,
291 .tx_rdy = mpc52xx_psc_tx_rdy,
292 .tx_empty = mpc52xx_psc_tx_empty,
293 .stop_rx = mpc52xx_psc_stop_rx,
294 .start_tx = mpc52xx_psc_start_tx,
295 .stop_tx = mpc52xx_psc_stop_tx,
296 .rx_clr_irq = mpc52xx_psc_rx_clr_irq,
297 .tx_clr_irq = mpc52xx_psc_tx_clr_irq,
298 .write_char = mpc52xx_psc_write_char,
299 .read_char = mpc52xx_psc_read_char,
300 .cw_disable_ints = mpc52xx_psc_cw_disable_ints,
301 .cw_restore_ints = mpc52xx_psc_cw_restore_ints,
302 .set_baudrate = mpc5200_psc_set_baudrate,
303 .get_irq = mpc52xx_psc_get_irq,
304 .handle_irq = mpc52xx_psc_handle_irq,
305};
306
307static struct psc_ops mpc5200b_psc_ops = {
308 .fifo_init = mpc52xx_psc_fifo_init,
309 .raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
310 .raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
311 .rx_rdy = mpc52xx_psc_rx_rdy,
312 .tx_rdy = mpc52xx_psc_tx_rdy,
313 .tx_empty = mpc52xx_psc_tx_empty,
314 .stop_rx = mpc52xx_psc_stop_rx,
315 .start_tx = mpc52xx_psc_start_tx,
316 .stop_tx = mpc52xx_psc_stop_tx,
317 .rx_clr_irq = mpc52xx_psc_rx_clr_irq,
318 .tx_clr_irq = mpc52xx_psc_tx_clr_irq,
319 .write_char = mpc52xx_psc_write_char,
320 .read_char = mpc52xx_psc_read_char,
321 .cw_disable_ints = mpc52xx_psc_cw_disable_ints,
322 .cw_restore_ints = mpc52xx_psc_cw_restore_ints,
323 .set_baudrate = mpc5200b_psc_set_baudrate,
324 .get_irq = mpc52xx_psc_get_irq,
325 .handle_irq = mpc52xx_psc_handle_irq,
326};
327
328#endif /* CONFIG_MPC52xx */
329
330#ifdef CONFIG_PPC_MPC512x
331#define FIFO_512x(port) ((struct mpc512x_psc_fifo __iomem *)(PSC(port)+1))
332
333/* PSC FIFO Controller for mpc512x */
334struct psc_fifoc {
335 u32 fifoc_cmd;
336 u32 fifoc_int;
337 u32 fifoc_dma;
338 u32 fifoc_axe;
339 u32 fifoc_debug;
340};
341
342static struct psc_fifoc __iomem *psc_fifoc;
343static unsigned int psc_fifoc_irq;
344
345static void mpc512x_psc_fifo_init(struct uart_port *port)
346{
347 /* /32 prescaler */
348 out_be16(&PSC(port)->mpc52xx_psc_clock_select, 0xdd00);
349
350 out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_RESET_SLICE);
351 out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
352 out_be32(&FIFO_512x(port)->txalarm, 1);
353 out_be32(&FIFO_512x(port)->tximr, 0);
354
355 out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_RESET_SLICE);
356 out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
357 out_be32(&FIFO_512x(port)->rxalarm, 1);
358 out_be32(&FIFO_512x(port)->rximr, 0);
359
360 out_be32(&FIFO_512x(port)->tximr, MPC512x_PSC_FIFO_ALARM);
361 out_be32(&FIFO_512x(port)->rximr, MPC512x_PSC_FIFO_ALARM);
362}
363
364static int mpc512x_psc_raw_rx_rdy(struct uart_port *port)
365{
366 return !(in_be32(&FIFO_512x(port)->rxsr) & MPC512x_PSC_FIFO_EMPTY);
367}
368
369static int mpc512x_psc_raw_tx_rdy(struct uart_port *port)
370{
371 return !(in_be32(&FIFO_512x(port)->txsr) & MPC512x_PSC_FIFO_FULL);
372}
373
374static int mpc512x_psc_rx_rdy(struct uart_port *port)
375{
376 return in_be32(&FIFO_512x(port)->rxsr)
377 & in_be32(&FIFO_512x(port)->rximr)
378 & MPC512x_PSC_FIFO_ALARM;
379}
380
381static int mpc512x_psc_tx_rdy(struct uart_port *port)
382{
383 return in_be32(&FIFO_512x(port)->txsr)
384 & in_be32(&FIFO_512x(port)->tximr)
385 & MPC512x_PSC_FIFO_ALARM;
386}
387
388static int mpc512x_psc_tx_empty(struct uart_port *port)
389{
390 return in_be32(&FIFO_512x(port)->txsr)
391 & MPC512x_PSC_FIFO_EMPTY;
392}
393
394static void mpc512x_psc_stop_rx(struct uart_port *port)
395{
396 unsigned long rx_fifo_imr;
397
398 rx_fifo_imr = in_be32(&FIFO_512x(port)->rximr);
399 rx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
400 out_be32(&FIFO_512x(port)->rximr, rx_fifo_imr);
401}
402
403static void mpc512x_psc_start_tx(struct uart_port *port)
404{
405 unsigned long tx_fifo_imr;
406
407 tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
408 tx_fifo_imr |= MPC512x_PSC_FIFO_ALARM;
409 out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
410}
411
412static void mpc512x_psc_stop_tx(struct uart_port *port)
413{
414 unsigned long tx_fifo_imr;
415
416 tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
417 tx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
418 out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
419}
420
421static void mpc512x_psc_rx_clr_irq(struct uart_port *port)
422{
423 out_be32(&FIFO_512x(port)->rxisr, in_be32(&FIFO_512x(port)->rxisr));
424}
425
426static void mpc512x_psc_tx_clr_irq(struct uart_port *port)
427{
428 out_be32(&FIFO_512x(port)->txisr, in_be32(&FIFO_512x(port)->txisr));
429}
430
431static void mpc512x_psc_write_char(struct uart_port *port, unsigned char c)
432{
433 out_8(&FIFO_512x(port)->txdata_8, c);
434}
435
436static unsigned char mpc512x_psc_read_char(struct uart_port *port)
437{
438 return in_8(&FIFO_512x(port)->rxdata_8);
439}
440
441static void mpc512x_psc_cw_disable_ints(struct uart_port *port)
442{
443 port->read_status_mask =
444 in_be32(&FIFO_512x(port)->tximr) << 16 |
445 in_be32(&FIFO_512x(port)->rximr);
446 out_be32(&FIFO_512x(port)->tximr, 0);
447 out_be32(&FIFO_512x(port)->rximr, 0);
448}
449
450static void mpc512x_psc_cw_restore_ints(struct uart_port *port)
451{
452 out_be32(&FIFO_512x(port)->tximr,
453 (port->read_status_mask >> 16) & 0x7f);
454 out_be32(&FIFO_512x(port)->rximr, port->read_status_mask & 0x7f);
455}
456
457static unsigned int mpc512x_psc_set_baudrate(struct uart_port *port,
458 struct ktermios *new,
459 struct ktermios *old)
460{
461 unsigned int baud;
462 unsigned int divisor;
463
464 /*
465 * The "MPC5121e Microcontroller Reference Manual, Rev. 3" says on
466 * pg. 30-10 that the chip supports a /32 and a /10 prescaler.
467 * Furthermore, it states that "After reset, the prescaler by 10
468 * for the UART mode is selected", but the reset register value is
469 * 0x0000 which means a /32 prescaler. This is wrong.
470 *
471 * In reality using /32 prescaler doesn't work, as it is not supported!
472 * Use /16 or /10 prescaler, see "MPC5121e Hardware Design Guide",
473 * Chapter 4.1 PSC in UART Mode.
474 * Calculate with a /16 prescaler here.
475 */
476
477 /* uartclk contains the ips freq */
478 baud = uart_get_baud_rate(port, new, old,
479 port->uartclk / (16 * 0xffff) + 1,
480 port->uartclk / 16);
481 divisor = (port->uartclk + 8 * baud) / (16 * baud);
482
483 /* enable the /16 prescaler and set the divisor */
484 mpc52xx_set_divisor(PSC(port), 0xdd00, divisor);
485 return baud;
486}
487
488/* Init PSC FIFO Controller */
489static int __init mpc512x_psc_fifoc_init(void)
490{
491 struct device_node *np;
492
493 np = of_find_compatible_node(NULL, NULL,
494 "fsl,mpc5121-psc-fifo");
495 if (!np) {
496 pr_err("%s: Can't find FIFOC node\n", __func__);
497 return -ENODEV;
498 }
499
500 psc_fifoc = of_iomap(np, 0);
501 if (!psc_fifoc) {
502 pr_err("%s: Can't map FIFOC\n", __func__);
503 of_node_put(np);
504 return -ENODEV;
505 }
506
507 psc_fifoc_irq = irq_of_parse_and_map(np, 0);
508 of_node_put(np);
509 if (psc_fifoc_irq == NO_IRQ) {
510 pr_err("%s: Can't get FIFOC irq\n", __func__);
511 iounmap(psc_fifoc);
512 return -ENODEV;
513 }
514
515 return 0;
516}
517
518static void __exit mpc512x_psc_fifoc_uninit(void)
519{
520 iounmap(psc_fifoc);
521}
522
523/* 512x specific interrupt handler. The caller holds the port lock */
524static irqreturn_t mpc512x_psc_handle_irq(struct uart_port *port)
525{
526 unsigned long fifoc_int;
527 int psc_num;
528
529 /* Read pending PSC FIFOC interrupts */
530 fifoc_int = in_be32(&psc_fifoc->fifoc_int);
531
532 /* Check if it is an interrupt for this port */
533 psc_num = (port->mapbase & 0xf00) >> 8;
534 if (test_bit(psc_num, &fifoc_int) ||
535 test_bit(psc_num + 16, &fifoc_int))
536 return mpc5xxx_uart_process_int(port);
537
538 return IRQ_NONE;
539}
540
541static int mpc512x_psc_clock(struct uart_port *port, int enable)
542{
543 struct clk *psc_clk;
544 int psc_num;
545 char clk_name[10];
546
547 if (uart_console(port))
548 return 0;
549
550 psc_num = (port->mapbase & 0xf00) >> 8;
551 snprintf(clk_name, sizeof(clk_name), "psc%d_clk", psc_num);
552 psc_clk = clk_get(port->dev, clk_name);
553 if (IS_ERR(psc_clk)) {
554 dev_err(port->dev, "Failed to get PSC clock entry!\n");
555 return -ENODEV;
556 }
557
558 dev_dbg(port->dev, "%s %sable\n", clk_name, enable ? "en" : "dis");
559
560 if (enable)
561 clk_enable(psc_clk);
562 else
563 clk_disable(psc_clk);
564
565 return 0;
566}
567
568static void mpc512x_psc_get_irq(struct uart_port *port, struct device_node *np)
569{
570 port->irqflags = IRQF_SHARED;
571 port->irq = psc_fifoc_irq;
572}
573
574static struct psc_ops mpc512x_psc_ops = {
575 .fifo_init = mpc512x_psc_fifo_init,
576 .raw_rx_rdy = mpc512x_psc_raw_rx_rdy,
577 .raw_tx_rdy = mpc512x_psc_raw_tx_rdy,
578 .rx_rdy = mpc512x_psc_rx_rdy,
579 .tx_rdy = mpc512x_psc_tx_rdy,
580 .tx_empty = mpc512x_psc_tx_empty,
581 .stop_rx = mpc512x_psc_stop_rx,
582 .start_tx = mpc512x_psc_start_tx,
583 .stop_tx = mpc512x_psc_stop_tx,
584 .rx_clr_irq = mpc512x_psc_rx_clr_irq,
585 .tx_clr_irq = mpc512x_psc_tx_clr_irq,
586 .write_char = mpc512x_psc_write_char,
587 .read_char = mpc512x_psc_read_char,
588 .cw_disable_ints = mpc512x_psc_cw_disable_ints,
589 .cw_restore_ints = mpc512x_psc_cw_restore_ints,
590 .set_baudrate = mpc512x_psc_set_baudrate,
591 .clock = mpc512x_psc_clock,
592 .fifoc_init = mpc512x_psc_fifoc_init,
593 .fifoc_uninit = mpc512x_psc_fifoc_uninit,
594 .get_irq = mpc512x_psc_get_irq,
595 .handle_irq = mpc512x_psc_handle_irq,
596};
597#endif
598
599static struct psc_ops *psc_ops;
600
601/* ======================================================================== */
602/* UART operations */
603/* ======================================================================== */
604
605static unsigned int
606mpc52xx_uart_tx_empty(struct uart_port *port)
607{
608 return psc_ops->tx_empty(port) ? TIOCSER_TEMT : 0;
609}
610
611static void
612mpc52xx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
613{
614 if (mctrl & TIOCM_RTS)
615 out_8(&PSC(port)->op1, MPC52xx_PSC_OP_RTS);
616 else
617 out_8(&PSC(port)->op0, MPC52xx_PSC_OP_RTS);
618}
619
620static unsigned int
621mpc52xx_uart_get_mctrl(struct uart_port *port)
622{
623 unsigned int ret = TIOCM_DSR;
624 u8 status = in_8(&PSC(port)->mpc52xx_psc_ipcr);
625
626 if (!(status & MPC52xx_PSC_CTS))
627 ret |= TIOCM_CTS;
628 if (!(status & MPC52xx_PSC_DCD))
629 ret |= TIOCM_CAR;
630
631 return ret;
632}
633
634static void
635mpc52xx_uart_stop_tx(struct uart_port *port)
636{
637 /* port->lock taken by caller */
638 psc_ops->stop_tx(port);
639}
640
641static void
642mpc52xx_uart_start_tx(struct uart_port *port)
643{
644 /* port->lock taken by caller */
645 psc_ops->start_tx(port);
646}
647
648static void
649mpc52xx_uart_send_xchar(struct uart_port *port, char ch)
650{
651 unsigned long flags;
652 spin_lock_irqsave(&port->lock, flags);
653
654 port->x_char = ch;
655 if (ch) {
656 /* Make sure tx interrupts are on */
657 /* Truly necessary ??? They should be anyway */
658 psc_ops->start_tx(port);
659 }
660
661 spin_unlock_irqrestore(&port->lock, flags);
662}
663
664static void
665mpc52xx_uart_stop_rx(struct uart_port *port)
666{
667 /* port->lock taken by caller */
668 psc_ops->stop_rx(port);
669}
670
671static void
672mpc52xx_uart_enable_ms(struct uart_port *port)
673{
674 struct mpc52xx_psc __iomem *psc = PSC(port);
675
676 /* clear D_*-bits by reading them */
677 in_8(&psc->mpc52xx_psc_ipcr);
678 /* enable CTS and DCD as IPC interrupts */
679 out_8(&psc->mpc52xx_psc_acr, MPC52xx_PSC_IEC_CTS | MPC52xx_PSC_IEC_DCD);
680
681 port->read_status_mask |= MPC52xx_PSC_IMR_IPC;
682 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
683}
684
685static void
686mpc52xx_uart_break_ctl(struct uart_port *port, int ctl)
687{
688 unsigned long flags;
689 spin_lock_irqsave(&port->lock, flags);
690
691 if (ctl == -1)
692 out_8(&PSC(port)->command, MPC52xx_PSC_START_BRK);
693 else
694 out_8(&PSC(port)->command, MPC52xx_PSC_STOP_BRK);
695
696 spin_unlock_irqrestore(&port->lock, flags);
697}
698
699static int
700mpc52xx_uart_startup(struct uart_port *port)
701{
702 struct mpc52xx_psc __iomem *psc = PSC(port);
703 int ret;
704
705 if (psc_ops->clock) {
706 ret = psc_ops->clock(port, 1);
707 if (ret)
708 return ret;
709 }
710
711 /* Request IRQ */
712 ret = request_irq(port->irq, mpc52xx_uart_int,
713 port->irqflags, "mpc52xx_psc_uart", port);
714 if (ret)
715 return ret;
716
717 /* Reset/activate the port, clear and enable interrupts */
718 out_8(&psc->command, MPC52xx_PSC_RST_RX);
719 out_8(&psc->command, MPC52xx_PSC_RST_TX);
720
721 out_be32(&psc->sicr, 0); /* UART mode DCD ignored */
722
723 psc_ops->fifo_init(port);
724
725 out_8(&psc->command, MPC52xx_PSC_TX_ENABLE);
726 out_8(&psc->command, MPC52xx_PSC_RX_ENABLE);
727
728 return 0;
729}
730
731static void
732mpc52xx_uart_shutdown(struct uart_port *port)
733{
734 struct mpc52xx_psc __iomem *psc = PSC(port);
735
736 /* Shut down the port. Leave TX active if on a console port */
737 out_8(&psc->command, MPC52xx_PSC_RST_RX);
738 if (!uart_console(port))
739 out_8(&psc->command, MPC52xx_PSC_RST_TX);
740
741 port->read_status_mask = 0;
742 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
743
744 if (psc_ops->clock)
745 psc_ops->clock(port, 0);
746
747 /* Release interrupt */
748 free_irq(port->irq, port);
749}
750
751static void
752mpc52xx_uart_set_termios(struct uart_port *port, struct ktermios *new,
753 struct ktermios *old)
754{
755 struct mpc52xx_psc __iomem *psc = PSC(port);
756 unsigned long flags;
757 unsigned char mr1, mr2;
758 unsigned int j;
759 unsigned int baud;
760
761 /* Prepare what we're gonna write */
762 mr1 = 0;
763
764 switch (new->c_cflag & CSIZE) {
765 case CS5: mr1 |= MPC52xx_PSC_MODE_5_BITS;
766 break;
767 case CS6: mr1 |= MPC52xx_PSC_MODE_6_BITS;
768 break;
769 case CS7: mr1 |= MPC52xx_PSC_MODE_7_BITS;
770 break;
771 case CS8:
772 default: mr1 |= MPC52xx_PSC_MODE_8_BITS;
773 }
774
775 if (new->c_cflag & PARENB) {
776 mr1 |= (new->c_cflag & PARODD) ?
777 MPC52xx_PSC_MODE_PARODD : MPC52xx_PSC_MODE_PAREVEN;
778 } else
779 mr1 |= MPC52xx_PSC_MODE_PARNONE;
780
781
782 mr2 = 0;
783
784 if (new->c_cflag & CSTOPB)
785 mr2 |= MPC52xx_PSC_MODE_TWO_STOP;
786 else
787 mr2 |= ((new->c_cflag & CSIZE) == CS5) ?
788 MPC52xx_PSC_MODE_ONE_STOP_5_BITS :
789 MPC52xx_PSC_MODE_ONE_STOP;
790
791 if (new->c_cflag & CRTSCTS) {
792 mr1 |= MPC52xx_PSC_MODE_RXRTS;
793 mr2 |= MPC52xx_PSC_MODE_TXCTS;
794 }
795
796 /* Get the lock */
797 spin_lock_irqsave(&port->lock, flags);
798
799 /* Do our best to flush TX & RX, so we don't lose anything */
800 /* But we don't wait indefinitely ! */
801 j = 5000000; /* Maximum wait */
802 /* FIXME Can't receive chars since set_termios might be called at early
803 * boot for the console, all stuff is not yet ready to receive at that
804 * time and that just makes the kernel oops */
805 /* while (j-- && mpc52xx_uart_int_rx_chars(port)); */
806 while (!mpc52xx_uart_tx_empty(port) && --j)
807 udelay(1);
808
809 if (!j)
810 printk(KERN_ERR "mpc52xx_uart.c: "
811 "Unable to flush RX & TX fifos in-time in set_termios."
812 "Some chars may have been lost.\n");
813
814 /* Reset the TX & RX */
815 out_8(&psc->command, MPC52xx_PSC_RST_RX);
816 out_8(&psc->command, MPC52xx_PSC_RST_TX);
817
818 /* Send new mode settings */
819 out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
820 out_8(&psc->mode, mr1);
821 out_8(&psc->mode, mr2);
822 baud = psc_ops->set_baudrate(port, new, old);
823
824 /* Update the per-port timeout */
825 uart_update_timeout(port, new->c_cflag, baud);
826
827 if (UART_ENABLE_MS(port, new->c_cflag))
828 mpc52xx_uart_enable_ms(port);
829
830 /* Reenable TX & RX */
831 out_8(&psc->command, MPC52xx_PSC_TX_ENABLE);
832 out_8(&psc->command, MPC52xx_PSC_RX_ENABLE);
833
834 /* We're all set, release the lock */
835 spin_unlock_irqrestore(&port->lock, flags);
836}
837
838static const char *
839mpc52xx_uart_type(struct uart_port *port)
840{
841 /*
842 * We keep using PORT_MPC52xx for historic reasons although it applies
843 * for MPC512x, too, but print "MPC5xxx" to not irritate users
844 */
845 return port->type == PORT_MPC52xx ? "MPC5xxx PSC" : NULL;
846}
847
848static void
849mpc52xx_uart_release_port(struct uart_port *port)
850{
851 /* remapped by us ? */
852 if (port->flags & UPF_IOREMAP) {
853 iounmap(port->membase);
854 port->membase = NULL;
855 }
856
857 release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc));
858}
859
860static int
861mpc52xx_uart_request_port(struct uart_port *port)
862{
863 int err;
864
865 if (port->flags & UPF_IOREMAP) /* Need to remap ? */
866 port->membase = ioremap(port->mapbase,
867 sizeof(struct mpc52xx_psc));
868
869 if (!port->membase)
870 return -EINVAL;
871
872 err = request_mem_region(port->mapbase, sizeof(struct mpc52xx_psc),
873 "mpc52xx_psc_uart") != NULL ? 0 : -EBUSY;
874
875 if (err && (port->flags & UPF_IOREMAP)) {
876 iounmap(port->membase);
877 port->membase = NULL;
878 }
879
880 return err;
881}
882
883static void
884mpc52xx_uart_config_port(struct uart_port *port, int flags)
885{
886 if ((flags & UART_CONFIG_TYPE)
887 && (mpc52xx_uart_request_port(port) == 0))
888 port->type = PORT_MPC52xx;
889}
890
891static int
892mpc52xx_uart_verify_port(struct uart_port *port, struct serial_struct *ser)
893{
894 if (ser->type != PORT_UNKNOWN && ser->type != PORT_MPC52xx)
895 return -EINVAL;
896
897 if ((ser->irq != port->irq) ||
898 (ser->io_type != UPIO_MEM) ||
899 (ser->baud_base != port->uartclk) ||
900 (ser->iomem_base != (void *)port->mapbase) ||
901 (ser->hub6 != 0))
902 return -EINVAL;
903
904 return 0;
905}
906
907
908static struct uart_ops mpc52xx_uart_ops = {
909 .tx_empty = mpc52xx_uart_tx_empty,
910 .set_mctrl = mpc52xx_uart_set_mctrl,
911 .get_mctrl = mpc52xx_uart_get_mctrl,
912 .stop_tx = mpc52xx_uart_stop_tx,
913 .start_tx = mpc52xx_uart_start_tx,
914 .send_xchar = mpc52xx_uart_send_xchar,
915 .stop_rx = mpc52xx_uart_stop_rx,
916 .enable_ms = mpc52xx_uart_enable_ms,
917 .break_ctl = mpc52xx_uart_break_ctl,
918 .startup = mpc52xx_uart_startup,
919 .shutdown = mpc52xx_uart_shutdown,
920 .set_termios = mpc52xx_uart_set_termios,
921/* .pm = mpc52xx_uart_pm, Not supported yet */
922/* .set_wake = mpc52xx_uart_set_wake, Not supported yet */
923 .type = mpc52xx_uart_type,
924 .release_port = mpc52xx_uart_release_port,
925 .request_port = mpc52xx_uart_request_port,
926 .config_port = mpc52xx_uart_config_port,
927 .verify_port = mpc52xx_uart_verify_port
928};
929
930
931/* ======================================================================== */
932/* Interrupt handling */
933/* ======================================================================== */
934
935static inline int
936mpc52xx_uart_int_rx_chars(struct uart_port *port)
937{
938 struct tty_struct *tty = port->state->port.tty;
939 unsigned char ch, flag;
940 unsigned short status;
941
942 /* While we can read, do so ! */
943 while (psc_ops->raw_rx_rdy(port)) {
944 /* Get the char */
945 ch = psc_ops->read_char(port);
946
947 /* Handle sysreq char */
948#ifdef SUPPORT_SYSRQ
949 if (uart_handle_sysrq_char(port, ch)) {
950 port->sysrq = 0;
951 continue;
952 }
953#endif
954
955 /* Store it */
956
957 flag = TTY_NORMAL;
958 port->icount.rx++;
959
960 status = in_be16(&PSC(port)->mpc52xx_psc_status);
961
962 if (status & (MPC52xx_PSC_SR_PE |
963 MPC52xx_PSC_SR_FE |
964 MPC52xx_PSC_SR_RB)) {
965
966 if (status & MPC52xx_PSC_SR_RB) {
967 flag = TTY_BREAK;
968 uart_handle_break(port);
969 port->icount.brk++;
970 } else if (status & MPC52xx_PSC_SR_PE) {
971 flag = TTY_PARITY;
972 port->icount.parity++;
973 }
974 else if (status & MPC52xx_PSC_SR_FE) {
975 flag = TTY_FRAME;
976 port->icount.frame++;
977 }
978
979 /* Clear error condition */
980 out_8(&PSC(port)->command, MPC52xx_PSC_RST_ERR_STAT);
981
982 }
983 tty_insert_flip_char(tty, ch, flag);
984 if (status & MPC52xx_PSC_SR_OE) {
985 /*
986 * Overrun is special, since it's
987 * reported immediately, and doesn't
988 * affect the current character
989 */
990 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
991 port->icount.overrun++;
992 }
993 }
994
995 spin_unlock(&port->lock);
996 tty_flip_buffer_push(tty);
997 spin_lock(&port->lock);
998
999 return psc_ops->raw_rx_rdy(port);
1000}
1001
1002static inline int
1003mpc52xx_uart_int_tx_chars(struct uart_port *port)
1004{
1005 struct circ_buf *xmit = &port->state->xmit;
1006
1007 /* Process out of band chars */
1008 if (port->x_char) {
1009 psc_ops->write_char(port, port->x_char);
1010 port->icount.tx++;
1011 port->x_char = 0;
1012 return 1;
1013 }
1014
1015 /* Nothing to do ? */
1016 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
1017 mpc52xx_uart_stop_tx(port);
1018 return 0;
1019 }
1020
1021 /* Send chars */
1022 while (psc_ops->raw_tx_rdy(port)) {
1023 psc_ops->write_char(port, xmit->buf[xmit->tail]);
1024 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
1025 port->icount.tx++;
1026 if (uart_circ_empty(xmit))
1027 break;
1028 }
1029
1030 /* Wake up */
1031 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
1032 uart_write_wakeup(port);
1033
1034 /* Maybe we're done after all */
1035 if (uart_circ_empty(xmit)) {
1036 mpc52xx_uart_stop_tx(port);
1037 return 0;
1038 }
1039
1040 return 1;
1041}
1042
1043static irqreturn_t
1044mpc5xxx_uart_process_int(struct uart_port *port)
1045{
1046 unsigned long pass = ISR_PASS_LIMIT;
1047 unsigned int keepgoing;
1048 u8 status;
1049
1050 /* While we have stuff to do, we continue */
1051 do {
1052 /* If we don't find anything to do, we stop */
1053 keepgoing = 0;
1054
1055 psc_ops->rx_clr_irq(port);
1056 if (psc_ops->rx_rdy(port))
1057 keepgoing |= mpc52xx_uart_int_rx_chars(port);
1058
1059 psc_ops->tx_clr_irq(port);
1060 if (psc_ops->tx_rdy(port))
1061 keepgoing |= mpc52xx_uart_int_tx_chars(port);
1062
1063 status = in_8(&PSC(port)->mpc52xx_psc_ipcr);
1064 if (status & MPC52xx_PSC_D_DCD)
1065 uart_handle_dcd_change(port, !(status & MPC52xx_PSC_DCD));
1066
1067 if (status & MPC52xx_PSC_D_CTS)
1068 uart_handle_cts_change(port, !(status & MPC52xx_PSC_CTS));
1069
1070 /* Limit number of iteration */
1071 if (!(--pass))
1072 keepgoing = 0;
1073
1074 } while (keepgoing);
1075
1076 return IRQ_HANDLED;
1077}
1078
1079static irqreturn_t
1080mpc52xx_uart_int(int irq, void *dev_id)
1081{
1082 struct uart_port *port = dev_id;
1083 irqreturn_t ret;
1084
1085 spin_lock(&port->lock);
1086
1087 ret = psc_ops->handle_irq(port);
1088
1089 spin_unlock(&port->lock);
1090
1091 return ret;
1092}
1093
1094/* ======================================================================== */
1095/* Console ( if applicable ) */
1096/* ======================================================================== */
1097
1098#ifdef CONFIG_SERIAL_MPC52xx_CONSOLE
1099
1100static void __init
1101mpc52xx_console_get_options(struct uart_port *port,
1102 int *baud, int *parity, int *bits, int *flow)
1103{
1104 struct mpc52xx_psc __iomem *psc = PSC(port);
1105 unsigned char mr1;
1106
1107 pr_debug("mpc52xx_console_get_options(port=%p)\n", port);
1108
1109 /* Read the mode registers */
1110 out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
1111 mr1 = in_8(&psc->mode);
1112
1113 /* CT{U,L}R are write-only ! */
1114 *baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
1115
1116 /* Parse them */
1117 switch (mr1 & MPC52xx_PSC_MODE_BITS_MASK) {
1118 case MPC52xx_PSC_MODE_5_BITS:
1119 *bits = 5;
1120 break;
1121 case MPC52xx_PSC_MODE_6_BITS:
1122 *bits = 6;
1123 break;
1124 case MPC52xx_PSC_MODE_7_BITS:
1125 *bits = 7;
1126 break;
1127 case MPC52xx_PSC_MODE_8_BITS:
1128 default:
1129 *bits = 8;
1130 }
1131
1132 if (mr1 & MPC52xx_PSC_MODE_PARNONE)
1133 *parity = 'n';
1134 else
1135 *parity = mr1 & MPC52xx_PSC_MODE_PARODD ? 'o' : 'e';
1136}
1137
1138static void
1139mpc52xx_console_write(struct console *co, const char *s, unsigned int count)
1140{
1141 struct uart_port *port = &mpc52xx_uart_ports[co->index];
1142 unsigned int i, j;
1143
1144 /* Disable interrupts */
1145 psc_ops->cw_disable_ints(port);
1146
1147 /* Wait the TX buffer to be empty */
1148 j = 5000000; /* Maximum wait */
1149 while (!mpc52xx_uart_tx_empty(port) && --j)
1150 udelay(1);
1151
1152 /* Write all the chars */
1153 for (i = 0; i < count; i++, s++) {
1154 /* Line return handling */
1155 if (*s == '\n')
1156 psc_ops->write_char(port, '\r');
1157
1158 /* Send the char */
1159 psc_ops->write_char(port, *s);
1160
1161 /* Wait the TX buffer to be empty */
1162 j = 20000; /* Maximum wait */
1163 while (!mpc52xx_uart_tx_empty(port) && --j)
1164 udelay(1);
1165 }
1166
1167 /* Restore interrupt state */
1168 psc_ops->cw_restore_ints(port);
1169}
1170
1171
1172static int __init
1173mpc52xx_console_setup(struct console *co, char *options)
1174{
1175 struct uart_port *port = &mpc52xx_uart_ports[co->index];
1176 struct device_node *np = mpc52xx_uart_nodes[co->index];
1177 unsigned int uartclk;
1178 struct resource res;
1179 int ret;
1180
1181 int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
1182 int bits = 8;
1183 int parity = 'n';
1184 int flow = 'n';
1185
1186 pr_debug("mpc52xx_console_setup co=%p, co->index=%i, options=%s\n",
1187 co, co->index, options);
1188
1189 if ((co->index < 0) || (co->index >= MPC52xx_PSC_MAXNUM)) {
1190 pr_debug("PSC%x out of range\n", co->index);
1191 return -EINVAL;
1192 }
1193
1194 if (!np) {
1195 pr_debug("PSC%x not found in device tree\n", co->index);
1196 return -EINVAL;
1197 }
1198
1199 pr_debug("Console on ttyPSC%x is %s\n",
1200 co->index, mpc52xx_uart_nodes[co->index]->full_name);
1201
1202 /* Fetch register locations */
1203 ret = of_address_to_resource(np, 0, &res);
1204 if (ret) {
1205 pr_debug("Could not get resources for PSC%x\n", co->index);
1206 return ret;
1207 }
1208
1209 uartclk = mpc5xxx_get_bus_frequency(np);
1210 if (uartclk == 0) {
1211 pr_debug("Could not find uart clock frequency!\n");
1212 return -EINVAL;
1213 }
1214
1215 /* Basic port init. Needed since we use some uart_??? func before
1216 * real init for early access */
1217 spin_lock_init(&port->lock);
1218 port->uartclk = uartclk;
1219 port->ops = &mpc52xx_uart_ops;
1220 port->mapbase = res.start;
1221 port->membase = ioremap(res.start, sizeof(struct mpc52xx_psc));
1222 port->irq = irq_of_parse_and_map(np, 0);
1223
1224 if (port->membase == NULL)
1225 return -EINVAL;
1226
1227 pr_debug("mpc52xx-psc uart at %p, mapped to %p, irq=%x, freq=%i\n",
1228 (void *)port->mapbase, port->membase,
1229 port->irq, port->uartclk);
1230
1231 /* Setup the port parameters accoding to options */
1232 if (options)
1233 uart_parse_options(options, &baud, &parity, &bits, &flow);
1234 else
1235 mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow);
1236
1237 pr_debug("Setting console parameters: %i %i%c1 flow=%c\n",
1238 baud, bits, parity, flow);
1239
1240 return uart_set_options(port, co, baud, parity, bits, flow);
1241}
1242
1243
1244static struct uart_driver mpc52xx_uart_driver;
1245
1246static struct console mpc52xx_console = {
1247 .name = "ttyPSC",
1248 .write = mpc52xx_console_write,
1249 .device = uart_console_device,
1250 .setup = mpc52xx_console_setup,
1251 .flags = CON_PRINTBUFFER,
1252 .index = -1, /* Specified on the cmdline (e.g. console=ttyPSC0) */
1253 .data = &mpc52xx_uart_driver,
1254};
1255
1256
1257static int __init
1258mpc52xx_console_init(void)
1259{
1260 mpc52xx_uart_of_enumerate();
1261 register_console(&mpc52xx_console);
1262 return 0;
1263}
1264
1265console_initcall(mpc52xx_console_init);
1266
1267#define MPC52xx_PSC_CONSOLE &mpc52xx_console
1268#else
1269#define MPC52xx_PSC_CONSOLE NULL
1270#endif
1271
1272
1273/* ======================================================================== */
1274/* UART Driver */
1275/* ======================================================================== */
1276
1277static struct uart_driver mpc52xx_uart_driver = {
1278 .driver_name = "mpc52xx_psc_uart",
1279 .dev_name = "ttyPSC",
1280 .major = SERIAL_PSC_MAJOR,
1281 .minor = SERIAL_PSC_MINOR,
1282 .nr = MPC52xx_PSC_MAXNUM,
1283 .cons = MPC52xx_PSC_CONSOLE,
1284};
1285
1286/* ======================================================================== */
1287/* OF Platform Driver */
1288/* ======================================================================== */
1289
1290static struct of_device_id mpc52xx_uart_of_match[] = {
1291#ifdef CONFIG_PPC_MPC52xx
1292 { .compatible = "fsl,mpc5200b-psc-uart", .data = &mpc5200b_psc_ops, },
1293 { .compatible = "fsl,mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
1294 /* binding used by old lite5200 device trees: */
1295 { .compatible = "mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
1296 /* binding used by efika: */
1297 { .compatible = "mpc5200-serial", .data = &mpc52xx_psc_ops, },
1298#endif
1299#ifdef CONFIG_PPC_MPC512x
1300 { .compatible = "fsl,mpc5121-psc-uart", .data = &mpc512x_psc_ops, },
1301#endif
1302 {},
1303};
1304
1305static int __devinit mpc52xx_uart_of_probe(struct platform_device *op)
1306{
1307 int idx = -1;
1308 unsigned int uartclk;
1309 struct uart_port *port = NULL;
1310 struct resource res;
1311 int ret;
1312
1313 /* Check validity & presence */
1314 for (idx = 0; idx < MPC52xx_PSC_MAXNUM; idx++)
1315 if (mpc52xx_uart_nodes[idx] == op->dev.of_node)
1316 break;
1317 if (idx >= MPC52xx_PSC_MAXNUM)
1318 return -EINVAL;
1319 pr_debug("Found %s assigned to ttyPSC%x\n",
1320 mpc52xx_uart_nodes[idx]->full_name, idx);
1321
1322 /* set the uart clock to the input clock of the psc, the different
1323 * prescalers are taken into account in the set_baudrate() methods
1324 * of the respective chip */
1325 uartclk = mpc5xxx_get_bus_frequency(op->dev.of_node);
1326 if (uartclk == 0) {
1327 dev_dbg(&op->dev, "Could not find uart clock frequency!\n");
1328 return -EINVAL;
1329 }
1330
1331 /* Init the port structure */
1332 port = &mpc52xx_uart_ports[idx];
1333
1334 spin_lock_init(&port->lock);
1335 port->uartclk = uartclk;
1336 port->fifosize = 512;
1337 port->iotype = UPIO_MEM;
1338 port->flags = UPF_BOOT_AUTOCONF |
1339 (uart_console(port) ? 0 : UPF_IOREMAP);
1340 port->line = idx;
1341 port->ops = &mpc52xx_uart_ops;
1342 port->dev = &op->dev;
1343
1344 /* Search for IRQ and mapbase */
1345 ret = of_address_to_resource(op->dev.of_node, 0, &res);
1346 if (ret)
1347 return ret;
1348
1349 port->mapbase = res.start;
1350 if (!port->mapbase) {
1351 dev_dbg(&op->dev, "Could not allocate resources for PSC\n");
1352 return -EINVAL;
1353 }
1354
1355 psc_ops->get_irq(port, op->dev.of_node);
1356 if (port->irq == NO_IRQ) {
1357 dev_dbg(&op->dev, "Could not get irq\n");
1358 return -EINVAL;
1359 }
1360
1361 dev_dbg(&op->dev, "mpc52xx-psc uart at %p, irq=%x, freq=%i\n",
1362 (void *)port->mapbase, port->irq, port->uartclk);
1363
1364 /* Add the port to the uart sub-system */
1365 ret = uart_add_one_port(&mpc52xx_uart_driver, port);
1366 if (ret)
1367 return ret;
1368
1369 dev_set_drvdata(&op->dev, (void *)port);
1370 return 0;
1371}
1372
1373static int
1374mpc52xx_uart_of_remove(struct platform_device *op)
1375{
1376 struct uart_port *port = dev_get_drvdata(&op->dev);
1377 dev_set_drvdata(&op->dev, NULL);
1378
1379 if (port)
1380 uart_remove_one_port(&mpc52xx_uart_driver, port);
1381
1382 return 0;
1383}
1384
1385#ifdef CONFIG_PM
1386static int
1387mpc52xx_uart_of_suspend(struct platform_device *op, pm_message_t state)
1388{
1389 struct uart_port *port = (struct uart_port *) dev_get_drvdata(&op->dev);
1390
1391 if (port)
1392 uart_suspend_port(&mpc52xx_uart_driver, port);
1393
1394 return 0;
1395}
1396
1397static int
1398mpc52xx_uart_of_resume(struct platform_device *op)
1399{
1400 struct uart_port *port = (struct uart_port *) dev_get_drvdata(&op->dev);
1401
1402 if (port)
1403 uart_resume_port(&mpc52xx_uart_driver, port);
1404
1405 return 0;
1406}
1407#endif
1408
1409static void
1410mpc52xx_uart_of_assign(struct device_node *np)
1411{
1412 int i;
1413
1414 /* Find the first free PSC number */
1415 for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
1416 if (mpc52xx_uart_nodes[i] == NULL) {
1417 of_node_get(np);
1418 mpc52xx_uart_nodes[i] = np;
1419 return;
1420 }
1421 }
1422}
1423
1424static void
1425mpc52xx_uart_of_enumerate(void)
1426{
1427 static int enum_done;
1428 struct device_node *np;
1429 const struct of_device_id *match;
1430 int i;
1431
1432 if (enum_done)
1433 return;
1434
1435 /* Assign index to each PSC in device tree */
1436 for_each_matching_node(np, mpc52xx_uart_of_match) {
1437 match = of_match_node(mpc52xx_uart_of_match, np);
1438 psc_ops = match->data;
1439 mpc52xx_uart_of_assign(np);
1440 }
1441
1442 enum_done = 1;
1443
1444 for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
1445 if (mpc52xx_uart_nodes[i])
1446 pr_debug("%s assigned to ttyPSC%x\n",
1447 mpc52xx_uart_nodes[i]->full_name, i);
1448 }
1449}
1450
1451MODULE_DEVICE_TABLE(of, mpc52xx_uart_of_match);
1452
1453static struct platform_driver mpc52xx_uart_of_driver = {
1454 .probe = mpc52xx_uart_of_probe,
1455 .remove = mpc52xx_uart_of_remove,
1456#ifdef CONFIG_PM
1457 .suspend = mpc52xx_uart_of_suspend,
1458 .resume = mpc52xx_uart_of_resume,
1459#endif
1460 .driver = {
1461 .name = "mpc52xx-psc-uart",
1462 .owner = THIS_MODULE,
1463 .of_match_table = mpc52xx_uart_of_match,
1464 },
1465};
1466
1467
1468/* ======================================================================== */
1469/* Module */
1470/* ======================================================================== */
1471
1472static int __init
1473mpc52xx_uart_init(void)
1474{
1475 int ret;
1476
1477 printk(KERN_INFO "Serial: MPC52xx PSC UART driver\n");
1478
1479 ret = uart_register_driver(&mpc52xx_uart_driver);
1480 if (ret) {
1481 printk(KERN_ERR "%s: uart_register_driver failed (%i)\n",
1482 __FILE__, ret);
1483 return ret;
1484 }
1485
1486 mpc52xx_uart_of_enumerate();
1487
1488 /*
1489 * Map the PSC FIFO Controller and init if on MPC512x.
1490 */
1491 if (psc_ops && psc_ops->fifoc_init) {
1492 ret = psc_ops->fifoc_init();
1493 if (ret)
1494 return ret;
1495 }
1496
1497 ret = platform_driver_register(&mpc52xx_uart_of_driver);
1498 if (ret) {
1499 printk(KERN_ERR "%s: platform_driver_register failed (%i)\n",
1500 __FILE__, ret);
1501 uart_unregister_driver(&mpc52xx_uart_driver);
1502 return ret;
1503 }
1504
1505 return 0;
1506}
1507
1508static void __exit
1509mpc52xx_uart_exit(void)
1510{
1511 if (psc_ops->fifoc_uninit)
1512 psc_ops->fifoc_uninit();
1513
1514 platform_driver_unregister(&mpc52xx_uart_of_driver);
1515 uart_unregister_driver(&mpc52xx_uart_driver);
1516}
1517
1518
1519module_init(mpc52xx_uart_init);
1520module_exit(mpc52xx_uart_exit);
1521
1522MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
1523MODULE_DESCRIPTION("Freescale MPC52xx PSC UART");
1524MODULE_LICENSE("GPL");
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/* PSC fifo operations for isolating differences between 52xx and 512x */
89/* ======================================================================== */
90
91struct psc_ops {
92 void (*fifo_init)(struct uart_port *port);
93 int (*raw_rx_rdy)(struct uart_port *port);
94 int (*raw_tx_rdy)(struct uart_port *port);
95 int (*rx_rdy)(struct uart_port *port);
96 int (*tx_rdy)(struct uart_port *port);
97 int (*tx_empty)(struct uart_port *port);
98 void (*stop_rx)(struct uart_port *port);
99 void (*start_tx)(struct uart_port *port);
100 void (*stop_tx)(struct uart_port *port);
101 void (*rx_clr_irq)(struct uart_port *port);
102 void (*tx_clr_irq)(struct uart_port *port);
103 void (*write_char)(struct uart_port *port, unsigned char c);
104 unsigned char (*read_char)(struct uart_port *port);
105 void (*cw_disable_ints)(struct uart_port *port);
106 void (*cw_restore_ints)(struct uart_port *port);
107 unsigned int (*set_baudrate)(struct uart_port *port,
108 struct ktermios *new,
109 struct ktermios *old);
110 int (*clock_alloc)(struct uart_port *port);
111 void (*clock_relse)(struct uart_port *port);
112 int (*clock)(struct uart_port *port, int enable);
113 int (*fifoc_init)(void);
114 void (*fifoc_uninit)(void);
115 void (*get_irq)(struct uart_port *, struct device_node *);
116 irqreturn_t (*handle_irq)(struct uart_port *port);
117 u16 (*get_status)(struct uart_port *port);
118 u8 (*get_ipcr)(struct uart_port *port);
119 void (*command)(struct uart_port *port, u8 cmd);
120 void (*set_mode)(struct uart_port *port, u8 mr1, u8 mr2);
121 void (*set_rts)(struct uart_port *port, int state);
122 void (*enable_ms)(struct uart_port *port);
123 void (*set_sicr)(struct uart_port *port, u32 val);
124 void (*set_imr)(struct uart_port *port, u16 val);
125 u8 (*get_mr1)(struct uart_port *port);
126};
127
128/* setting the prescaler and divisor reg is common for all chips */
129static inline void mpc52xx_set_divisor(struct mpc52xx_psc __iomem *psc,
130 u16 prescaler, unsigned int divisor)
131{
132 /* select prescaler */
133 out_be16(&psc->mpc52xx_psc_clock_select, prescaler);
134 out_8(&psc->ctur, divisor >> 8);
135 out_8(&psc->ctlr, divisor & 0xff);
136}
137
138static u16 mpc52xx_psc_get_status(struct uart_port *port)
139{
140 return in_be16(&PSC(port)->mpc52xx_psc_status);
141}
142
143static u8 mpc52xx_psc_get_ipcr(struct uart_port *port)
144{
145 return in_8(&PSC(port)->mpc52xx_psc_ipcr);
146}
147
148static void mpc52xx_psc_command(struct uart_port *port, u8 cmd)
149{
150 out_8(&PSC(port)->command, cmd);
151}
152
153static void mpc52xx_psc_set_mode(struct uart_port *port, u8 mr1, u8 mr2)
154{
155 out_8(&PSC(port)->command, MPC52xx_PSC_SEL_MODE_REG_1);
156 out_8(&PSC(port)->mode, mr1);
157 out_8(&PSC(port)->mode, mr2);
158}
159
160static void mpc52xx_psc_set_rts(struct uart_port *port, int state)
161{
162 if (state)
163 out_8(&PSC(port)->op1, MPC52xx_PSC_OP_RTS);
164 else
165 out_8(&PSC(port)->op0, MPC52xx_PSC_OP_RTS);
166}
167
168static void mpc52xx_psc_enable_ms(struct uart_port *port)
169{
170 struct mpc52xx_psc __iomem *psc = PSC(port);
171
172 /* clear D_*-bits by reading them */
173 in_8(&psc->mpc52xx_psc_ipcr);
174 /* enable CTS and DCD as IPC interrupts */
175 out_8(&psc->mpc52xx_psc_acr, MPC52xx_PSC_IEC_CTS | MPC52xx_PSC_IEC_DCD);
176
177 port->read_status_mask |= MPC52xx_PSC_IMR_IPC;
178 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
179}
180
181static void mpc52xx_psc_set_sicr(struct uart_port *port, u32 val)
182{
183 out_be32(&PSC(port)->sicr, val);
184}
185
186static void mpc52xx_psc_set_imr(struct uart_port *port, u16 val)
187{
188 out_be16(&PSC(port)->mpc52xx_psc_imr, val);
189}
190
191static u8 mpc52xx_psc_get_mr1(struct uart_port *port)
192{
193 out_8(&PSC(port)->command, MPC52xx_PSC_SEL_MODE_REG_1);
194 return in_8(&PSC(port)->mode);
195}
196
197#ifdef CONFIG_PPC_MPC52xx
198#define FIFO_52xx(port) ((struct mpc52xx_psc_fifo __iomem *)(PSC(port)+1))
199static void mpc52xx_psc_fifo_init(struct uart_port *port)
200{
201 struct mpc52xx_psc __iomem *psc = PSC(port);
202 struct mpc52xx_psc_fifo __iomem *fifo = FIFO_52xx(port);
203
204 out_8(&fifo->rfcntl, 0x00);
205 out_be16(&fifo->rfalarm, 0x1ff);
206 out_8(&fifo->tfcntl, 0x07);
207 out_be16(&fifo->tfalarm, 0x80);
208
209 port->read_status_mask |= MPC52xx_PSC_IMR_RXRDY | MPC52xx_PSC_IMR_TXRDY;
210 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
211}
212
213static int mpc52xx_psc_raw_rx_rdy(struct uart_port *port)
214{
215 return in_be16(&PSC(port)->mpc52xx_psc_status)
216 & MPC52xx_PSC_SR_RXRDY;
217}
218
219static int mpc52xx_psc_raw_tx_rdy(struct uart_port *port)
220{
221 return in_be16(&PSC(port)->mpc52xx_psc_status)
222 & MPC52xx_PSC_SR_TXRDY;
223}
224
225
226static int mpc52xx_psc_rx_rdy(struct uart_port *port)
227{
228 return in_be16(&PSC(port)->mpc52xx_psc_isr)
229 & port->read_status_mask
230 & MPC52xx_PSC_IMR_RXRDY;
231}
232
233static int mpc52xx_psc_tx_rdy(struct uart_port *port)
234{
235 return in_be16(&PSC(port)->mpc52xx_psc_isr)
236 & port->read_status_mask
237 & MPC52xx_PSC_IMR_TXRDY;
238}
239
240static int mpc52xx_psc_tx_empty(struct uart_port *port)
241{
242 u16 sts = in_be16(&PSC(port)->mpc52xx_psc_status);
243
244 return (sts & MPC52xx_PSC_SR_TXEMP) ? TIOCSER_TEMT : 0;
245}
246
247static void mpc52xx_psc_start_tx(struct uart_port *port)
248{
249 port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY;
250 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
251}
252
253static void mpc52xx_psc_stop_tx(struct uart_port *port)
254{
255 port->read_status_mask &= ~MPC52xx_PSC_IMR_TXRDY;
256 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
257}
258
259static void mpc52xx_psc_stop_rx(struct uart_port *port)
260{
261 port->read_status_mask &= ~MPC52xx_PSC_IMR_RXRDY;
262 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
263}
264
265static void mpc52xx_psc_rx_clr_irq(struct uart_port *port)
266{
267}
268
269static void mpc52xx_psc_tx_clr_irq(struct uart_port *port)
270{
271}
272
273static void mpc52xx_psc_write_char(struct uart_port *port, unsigned char c)
274{
275 out_8(&PSC(port)->mpc52xx_psc_buffer_8, c);
276}
277
278static unsigned char mpc52xx_psc_read_char(struct uart_port *port)
279{
280 return in_8(&PSC(port)->mpc52xx_psc_buffer_8);
281}
282
283static void mpc52xx_psc_cw_disable_ints(struct uart_port *port)
284{
285 out_be16(&PSC(port)->mpc52xx_psc_imr, 0);
286}
287
288static void mpc52xx_psc_cw_restore_ints(struct uart_port *port)
289{
290 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
291}
292
293static unsigned int mpc5200_psc_set_baudrate(struct uart_port *port,
294 struct ktermios *new,
295 struct ktermios *old)
296{
297 unsigned int baud;
298 unsigned int divisor;
299
300 /* The 5200 has a fixed /32 prescaler, uartclk contains the ipb freq */
301 baud = uart_get_baud_rate(port, new, old,
302 port->uartclk / (32 * 0xffff) + 1,
303 port->uartclk / 32);
304 divisor = (port->uartclk + 16 * baud) / (32 * baud);
305
306 /* enable the /32 prescaler and set the divisor */
307 mpc52xx_set_divisor(PSC(port), 0xdd00, divisor);
308 return baud;
309}
310
311static unsigned int mpc5200b_psc_set_baudrate(struct uart_port *port,
312 struct ktermios *new,
313 struct ktermios *old)
314{
315 unsigned int baud;
316 unsigned int divisor;
317 u16 prescaler;
318
319 /* The 5200B has a selectable /4 or /32 prescaler, uartclk contains the
320 * ipb freq */
321 baud = uart_get_baud_rate(port, new, old,
322 port->uartclk / (32 * 0xffff) + 1,
323 port->uartclk / 4);
324 divisor = (port->uartclk + 2 * baud) / (4 * baud);
325
326 /* select the proper prescaler and set the divisor
327 * prefer high prescaler for more tolerance on low baudrates */
328 if (divisor > 0xffff || baud <= 115200) {
329 divisor = (divisor + 4) / 8;
330 prescaler = 0xdd00; /* /32 */
331 } else
332 prescaler = 0xff00; /* /4 */
333 mpc52xx_set_divisor(PSC(port), prescaler, divisor);
334 return baud;
335}
336
337static void mpc52xx_psc_get_irq(struct uart_port *port, struct device_node *np)
338{
339 port->irqflags = 0;
340 port->irq = irq_of_parse_and_map(np, 0);
341}
342
343/* 52xx specific interrupt handler. The caller holds the port lock */
344static irqreturn_t mpc52xx_psc_handle_irq(struct uart_port *port)
345{
346 return mpc5xxx_uart_process_int(port);
347}
348
349static const struct psc_ops mpc52xx_psc_ops = {
350 .fifo_init = mpc52xx_psc_fifo_init,
351 .raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
352 .raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
353 .rx_rdy = mpc52xx_psc_rx_rdy,
354 .tx_rdy = mpc52xx_psc_tx_rdy,
355 .tx_empty = mpc52xx_psc_tx_empty,
356 .stop_rx = mpc52xx_psc_stop_rx,
357 .start_tx = mpc52xx_psc_start_tx,
358 .stop_tx = mpc52xx_psc_stop_tx,
359 .rx_clr_irq = mpc52xx_psc_rx_clr_irq,
360 .tx_clr_irq = mpc52xx_psc_tx_clr_irq,
361 .write_char = mpc52xx_psc_write_char,
362 .read_char = mpc52xx_psc_read_char,
363 .cw_disable_ints = mpc52xx_psc_cw_disable_ints,
364 .cw_restore_ints = mpc52xx_psc_cw_restore_ints,
365 .set_baudrate = mpc5200_psc_set_baudrate,
366 .get_irq = mpc52xx_psc_get_irq,
367 .handle_irq = mpc52xx_psc_handle_irq,
368 .get_status = mpc52xx_psc_get_status,
369 .get_ipcr = mpc52xx_psc_get_ipcr,
370 .command = mpc52xx_psc_command,
371 .set_mode = mpc52xx_psc_set_mode,
372 .set_rts = mpc52xx_psc_set_rts,
373 .enable_ms = mpc52xx_psc_enable_ms,
374 .set_sicr = mpc52xx_psc_set_sicr,
375 .set_imr = mpc52xx_psc_set_imr,
376 .get_mr1 = mpc52xx_psc_get_mr1,
377};
378
379static const struct psc_ops mpc5200b_psc_ops = {
380 .fifo_init = mpc52xx_psc_fifo_init,
381 .raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
382 .raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
383 .rx_rdy = mpc52xx_psc_rx_rdy,
384 .tx_rdy = mpc52xx_psc_tx_rdy,
385 .tx_empty = mpc52xx_psc_tx_empty,
386 .stop_rx = mpc52xx_psc_stop_rx,
387 .start_tx = mpc52xx_psc_start_tx,
388 .stop_tx = mpc52xx_psc_stop_tx,
389 .rx_clr_irq = mpc52xx_psc_rx_clr_irq,
390 .tx_clr_irq = mpc52xx_psc_tx_clr_irq,
391 .write_char = mpc52xx_psc_write_char,
392 .read_char = mpc52xx_psc_read_char,
393 .cw_disable_ints = mpc52xx_psc_cw_disable_ints,
394 .cw_restore_ints = mpc52xx_psc_cw_restore_ints,
395 .set_baudrate = mpc5200b_psc_set_baudrate,
396 .get_irq = mpc52xx_psc_get_irq,
397 .handle_irq = mpc52xx_psc_handle_irq,
398 .get_status = mpc52xx_psc_get_status,
399 .get_ipcr = mpc52xx_psc_get_ipcr,
400 .command = mpc52xx_psc_command,
401 .set_mode = mpc52xx_psc_set_mode,
402 .set_rts = mpc52xx_psc_set_rts,
403 .enable_ms = mpc52xx_psc_enable_ms,
404 .set_sicr = mpc52xx_psc_set_sicr,
405 .set_imr = mpc52xx_psc_set_imr,
406 .get_mr1 = mpc52xx_psc_get_mr1,
407};
408
409#endif /* CONFIG_PPC_MPC52xx */
410
411#ifdef CONFIG_PPC_MPC512x
412#define FIFO_512x(port) ((struct mpc512x_psc_fifo __iomem *)(PSC(port)+1))
413
414/* PSC FIFO Controller for mpc512x */
415struct psc_fifoc {
416 u32 fifoc_cmd;
417 u32 fifoc_int;
418 u32 fifoc_dma;
419 u32 fifoc_axe;
420 u32 fifoc_debug;
421};
422
423static struct psc_fifoc __iomem *psc_fifoc;
424static unsigned int psc_fifoc_irq;
425static struct clk *psc_fifoc_clk;
426
427static void mpc512x_psc_fifo_init(struct uart_port *port)
428{
429 /* /32 prescaler */
430 out_be16(&PSC(port)->mpc52xx_psc_clock_select, 0xdd00);
431
432 out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_RESET_SLICE);
433 out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
434 out_be32(&FIFO_512x(port)->txalarm, 1);
435 out_be32(&FIFO_512x(port)->tximr, 0);
436
437 out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_RESET_SLICE);
438 out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
439 out_be32(&FIFO_512x(port)->rxalarm, 1);
440 out_be32(&FIFO_512x(port)->rximr, 0);
441
442 out_be32(&FIFO_512x(port)->tximr, MPC512x_PSC_FIFO_ALARM);
443 out_be32(&FIFO_512x(port)->rximr, MPC512x_PSC_FIFO_ALARM);
444}
445
446static int mpc512x_psc_raw_rx_rdy(struct uart_port *port)
447{
448 return !(in_be32(&FIFO_512x(port)->rxsr) & MPC512x_PSC_FIFO_EMPTY);
449}
450
451static int mpc512x_psc_raw_tx_rdy(struct uart_port *port)
452{
453 return !(in_be32(&FIFO_512x(port)->txsr) & MPC512x_PSC_FIFO_FULL);
454}
455
456static int mpc512x_psc_rx_rdy(struct uart_port *port)
457{
458 return in_be32(&FIFO_512x(port)->rxsr)
459 & in_be32(&FIFO_512x(port)->rximr)
460 & MPC512x_PSC_FIFO_ALARM;
461}
462
463static int mpc512x_psc_tx_rdy(struct uart_port *port)
464{
465 return in_be32(&FIFO_512x(port)->txsr)
466 & in_be32(&FIFO_512x(port)->tximr)
467 & MPC512x_PSC_FIFO_ALARM;
468}
469
470static int mpc512x_psc_tx_empty(struct uart_port *port)
471{
472 return in_be32(&FIFO_512x(port)->txsr)
473 & MPC512x_PSC_FIFO_EMPTY;
474}
475
476static void mpc512x_psc_stop_rx(struct uart_port *port)
477{
478 unsigned long rx_fifo_imr;
479
480 rx_fifo_imr = in_be32(&FIFO_512x(port)->rximr);
481 rx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
482 out_be32(&FIFO_512x(port)->rximr, rx_fifo_imr);
483}
484
485static void mpc512x_psc_start_tx(struct uart_port *port)
486{
487 unsigned long tx_fifo_imr;
488
489 tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
490 tx_fifo_imr |= MPC512x_PSC_FIFO_ALARM;
491 out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
492}
493
494static void mpc512x_psc_stop_tx(struct uart_port *port)
495{
496 unsigned long tx_fifo_imr;
497
498 tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
499 tx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
500 out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
501}
502
503static void mpc512x_psc_rx_clr_irq(struct uart_port *port)
504{
505 out_be32(&FIFO_512x(port)->rxisr, in_be32(&FIFO_512x(port)->rxisr));
506}
507
508static void mpc512x_psc_tx_clr_irq(struct uart_port *port)
509{
510 out_be32(&FIFO_512x(port)->txisr, in_be32(&FIFO_512x(port)->txisr));
511}
512
513static void mpc512x_psc_write_char(struct uart_port *port, unsigned char c)
514{
515 out_8(&FIFO_512x(port)->txdata_8, c);
516}
517
518static unsigned char mpc512x_psc_read_char(struct uart_port *port)
519{
520 return in_8(&FIFO_512x(port)->rxdata_8);
521}
522
523static void mpc512x_psc_cw_disable_ints(struct uart_port *port)
524{
525 port->read_status_mask =
526 in_be32(&FIFO_512x(port)->tximr) << 16 |
527 in_be32(&FIFO_512x(port)->rximr);
528 out_be32(&FIFO_512x(port)->tximr, 0);
529 out_be32(&FIFO_512x(port)->rximr, 0);
530}
531
532static void mpc512x_psc_cw_restore_ints(struct uart_port *port)
533{
534 out_be32(&FIFO_512x(port)->tximr,
535 (port->read_status_mask >> 16) & 0x7f);
536 out_be32(&FIFO_512x(port)->rximr, port->read_status_mask & 0x7f);
537}
538
539static unsigned int mpc512x_psc_set_baudrate(struct uart_port *port,
540 struct ktermios *new,
541 struct ktermios *old)
542{
543 unsigned int baud;
544 unsigned int divisor;
545
546 /*
547 * The "MPC5121e Microcontroller Reference Manual, Rev. 3" says on
548 * pg. 30-10 that the chip supports a /32 and a /10 prescaler.
549 * Furthermore, it states that "After reset, the prescaler by 10
550 * for the UART mode is selected", but the reset register value is
551 * 0x0000 which means a /32 prescaler. This is wrong.
552 *
553 * In reality using /32 prescaler doesn't work, as it is not supported!
554 * Use /16 or /10 prescaler, see "MPC5121e Hardware Design Guide",
555 * Chapter 4.1 PSC in UART Mode.
556 * Calculate with a /16 prescaler here.
557 */
558
559 /* uartclk contains the ips freq */
560 baud = uart_get_baud_rate(port, new, old,
561 port->uartclk / (16 * 0xffff) + 1,
562 port->uartclk / 16);
563 divisor = (port->uartclk + 8 * baud) / (16 * baud);
564
565 /* enable the /16 prescaler and set the divisor */
566 mpc52xx_set_divisor(PSC(port), 0xdd00, divisor);
567 return baud;
568}
569
570/* Init PSC FIFO Controller */
571static int __init mpc512x_psc_fifoc_init(void)
572{
573 int err;
574 struct device_node *np;
575 struct clk *clk;
576
577 /* default error code, potentially overwritten by clock calls */
578 err = -ENODEV;
579
580 np = of_find_compatible_node(NULL, NULL,
581 "fsl,mpc5121-psc-fifo");
582 if (!np) {
583 pr_err("%s: Can't find FIFOC node\n", __func__);
584 goto out_err;
585 }
586
587 clk = of_clk_get(np, 0);
588 if (IS_ERR(clk)) {
589 /* backwards compat with device trees that lack clock specs */
590 clk = clk_get_sys(np->name, "ipg");
591 }
592 if (IS_ERR(clk)) {
593 pr_err("%s: Can't lookup FIFO clock\n", __func__);
594 err = PTR_ERR(clk);
595 goto out_ofnode_put;
596 }
597 if (clk_prepare_enable(clk)) {
598 pr_err("%s: Can't enable FIFO clock\n", __func__);
599 clk_put(clk);
600 goto out_ofnode_put;
601 }
602 psc_fifoc_clk = clk;
603
604 psc_fifoc = of_iomap(np, 0);
605 if (!psc_fifoc) {
606 pr_err("%s: Can't map FIFOC\n", __func__);
607 goto out_clk_disable;
608 }
609
610 psc_fifoc_irq = irq_of_parse_and_map(np, 0);
611 if (psc_fifoc_irq == 0) {
612 pr_err("%s: Can't get FIFOC irq\n", __func__);
613 goto out_unmap;
614 }
615
616 of_node_put(np);
617 return 0;
618
619out_unmap:
620 iounmap(psc_fifoc);
621out_clk_disable:
622 clk_disable_unprepare(psc_fifoc_clk);
623 clk_put(psc_fifoc_clk);
624out_ofnode_put:
625 of_node_put(np);
626out_err:
627 return err;
628}
629
630static void __exit mpc512x_psc_fifoc_uninit(void)
631{
632 iounmap(psc_fifoc);
633
634 /* disable the clock, errors are not fatal */
635 if (psc_fifoc_clk) {
636 clk_disable_unprepare(psc_fifoc_clk);
637 clk_put(psc_fifoc_clk);
638 psc_fifoc_clk = NULL;
639 }
640}
641
642/* 512x specific interrupt handler. The caller holds the port lock */
643static irqreturn_t mpc512x_psc_handle_irq(struct uart_port *port)
644{
645 unsigned long fifoc_int;
646 int psc_num;
647
648 /* Read pending PSC FIFOC interrupts */
649 fifoc_int = in_be32(&psc_fifoc->fifoc_int);
650
651 /* Check if it is an interrupt for this port */
652 psc_num = (port->mapbase & 0xf00) >> 8;
653 if (test_bit(psc_num, &fifoc_int) ||
654 test_bit(psc_num + 16, &fifoc_int))
655 return mpc5xxx_uart_process_int(port);
656
657 return IRQ_NONE;
658}
659
660static struct clk *psc_mclk_clk[MPC52xx_PSC_MAXNUM];
661static struct clk *psc_ipg_clk[MPC52xx_PSC_MAXNUM];
662
663/* called from within the .request_port() callback (allocation) */
664static int mpc512x_psc_alloc_clock(struct uart_port *port)
665{
666 int psc_num;
667 struct clk *clk;
668 int err;
669
670 psc_num = (port->mapbase & 0xf00) >> 8;
671
672 clk = devm_clk_get(port->dev, "mclk");
673 if (IS_ERR(clk)) {
674 dev_err(port->dev, "Failed to get MCLK!\n");
675 err = PTR_ERR(clk);
676 goto out_err;
677 }
678 err = clk_prepare_enable(clk);
679 if (err) {
680 dev_err(port->dev, "Failed to enable MCLK!\n");
681 goto out_err;
682 }
683 psc_mclk_clk[psc_num] = clk;
684
685 clk = devm_clk_get(port->dev, "ipg");
686 if (IS_ERR(clk)) {
687 dev_err(port->dev, "Failed to get IPG clock!\n");
688 err = PTR_ERR(clk);
689 goto out_err;
690 }
691 err = clk_prepare_enable(clk);
692 if (err) {
693 dev_err(port->dev, "Failed to enable IPG clock!\n");
694 goto out_err;
695 }
696 psc_ipg_clk[psc_num] = clk;
697
698 return 0;
699
700out_err:
701 if (psc_mclk_clk[psc_num]) {
702 clk_disable_unprepare(psc_mclk_clk[psc_num]);
703 psc_mclk_clk[psc_num] = NULL;
704 }
705 if (psc_ipg_clk[psc_num]) {
706 clk_disable_unprepare(psc_ipg_clk[psc_num]);
707 psc_ipg_clk[psc_num] = NULL;
708 }
709 return err;
710}
711
712/* called from within the .release_port() callback (release) */
713static void mpc512x_psc_relse_clock(struct uart_port *port)
714{
715 int psc_num;
716 struct clk *clk;
717
718 psc_num = (port->mapbase & 0xf00) >> 8;
719 clk = psc_mclk_clk[psc_num];
720 if (clk) {
721 clk_disable_unprepare(clk);
722 psc_mclk_clk[psc_num] = NULL;
723 }
724 if (psc_ipg_clk[psc_num]) {
725 clk_disable_unprepare(psc_ipg_clk[psc_num]);
726 psc_ipg_clk[psc_num] = NULL;
727 }
728}
729
730/* implementation of the .clock() callback (enable/disable) */
731static int mpc512x_psc_endis_clock(struct uart_port *port, int enable)
732{
733 int psc_num;
734 struct clk *psc_clk;
735 int ret;
736
737 if (uart_console(port))
738 return 0;
739
740 psc_num = (port->mapbase & 0xf00) >> 8;
741 psc_clk = psc_mclk_clk[psc_num];
742 if (!psc_clk) {
743 dev_err(port->dev, "Failed to get PSC clock entry!\n");
744 return -ENODEV;
745 }
746
747 dev_dbg(port->dev, "mclk %sable\n", enable ? "en" : "dis");
748 if (enable) {
749 ret = clk_enable(psc_clk);
750 if (ret)
751 dev_err(port->dev, "Failed to enable MCLK!\n");
752 return ret;
753 } else {
754 clk_disable(psc_clk);
755 return 0;
756 }
757}
758
759static void mpc512x_psc_get_irq(struct uart_port *port, struct device_node *np)
760{
761 port->irqflags = IRQF_SHARED;
762 port->irq = psc_fifoc_irq;
763}
764#endif
765
766#ifdef CONFIG_PPC_MPC512x
767
768#define PSC_5125(port) ((struct mpc5125_psc __iomem *)((port)->membase))
769#define FIFO_5125(port) ((struct mpc512x_psc_fifo __iomem *)(PSC_5125(port)+1))
770
771static void mpc5125_psc_fifo_init(struct uart_port *port)
772{
773 /* /32 prescaler */
774 out_8(&PSC_5125(port)->mpc52xx_psc_clock_select, 0xdd);
775
776 out_be32(&FIFO_5125(port)->txcmd, MPC512x_PSC_FIFO_RESET_SLICE);
777 out_be32(&FIFO_5125(port)->txcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
778 out_be32(&FIFO_5125(port)->txalarm, 1);
779 out_be32(&FIFO_5125(port)->tximr, 0);
780
781 out_be32(&FIFO_5125(port)->rxcmd, MPC512x_PSC_FIFO_RESET_SLICE);
782 out_be32(&FIFO_5125(port)->rxcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
783 out_be32(&FIFO_5125(port)->rxalarm, 1);
784 out_be32(&FIFO_5125(port)->rximr, 0);
785
786 out_be32(&FIFO_5125(port)->tximr, MPC512x_PSC_FIFO_ALARM);
787 out_be32(&FIFO_5125(port)->rximr, MPC512x_PSC_FIFO_ALARM);
788}
789
790static int mpc5125_psc_raw_rx_rdy(struct uart_port *port)
791{
792 return !(in_be32(&FIFO_5125(port)->rxsr) & MPC512x_PSC_FIFO_EMPTY);
793}
794
795static int mpc5125_psc_raw_tx_rdy(struct uart_port *port)
796{
797 return !(in_be32(&FIFO_5125(port)->txsr) & MPC512x_PSC_FIFO_FULL);
798}
799
800static int mpc5125_psc_rx_rdy(struct uart_port *port)
801{
802 return in_be32(&FIFO_5125(port)->rxsr) &
803 in_be32(&FIFO_5125(port)->rximr) & MPC512x_PSC_FIFO_ALARM;
804}
805
806static int mpc5125_psc_tx_rdy(struct uart_port *port)
807{
808 return in_be32(&FIFO_5125(port)->txsr) &
809 in_be32(&FIFO_5125(port)->tximr) & MPC512x_PSC_FIFO_ALARM;
810}
811
812static int mpc5125_psc_tx_empty(struct uart_port *port)
813{
814 return in_be32(&FIFO_5125(port)->txsr) & MPC512x_PSC_FIFO_EMPTY;
815}
816
817static void mpc5125_psc_stop_rx(struct uart_port *port)
818{
819 unsigned long rx_fifo_imr;
820
821 rx_fifo_imr = in_be32(&FIFO_5125(port)->rximr);
822 rx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
823 out_be32(&FIFO_5125(port)->rximr, rx_fifo_imr);
824}
825
826static void mpc5125_psc_start_tx(struct uart_port *port)
827{
828 unsigned long tx_fifo_imr;
829
830 tx_fifo_imr = in_be32(&FIFO_5125(port)->tximr);
831 tx_fifo_imr |= MPC512x_PSC_FIFO_ALARM;
832 out_be32(&FIFO_5125(port)->tximr, tx_fifo_imr);
833}
834
835static void mpc5125_psc_stop_tx(struct uart_port *port)
836{
837 unsigned long tx_fifo_imr;
838
839 tx_fifo_imr = in_be32(&FIFO_5125(port)->tximr);
840 tx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
841 out_be32(&FIFO_5125(port)->tximr, tx_fifo_imr);
842}
843
844static void mpc5125_psc_rx_clr_irq(struct uart_port *port)
845{
846 out_be32(&FIFO_5125(port)->rxisr, in_be32(&FIFO_5125(port)->rxisr));
847}
848
849static void mpc5125_psc_tx_clr_irq(struct uart_port *port)
850{
851 out_be32(&FIFO_5125(port)->txisr, in_be32(&FIFO_5125(port)->txisr));
852}
853
854static void mpc5125_psc_write_char(struct uart_port *port, unsigned char c)
855{
856 out_8(&FIFO_5125(port)->txdata_8, c);
857}
858
859static unsigned char mpc5125_psc_read_char(struct uart_port *port)
860{
861 return in_8(&FIFO_5125(port)->rxdata_8);
862}
863
864static void mpc5125_psc_cw_disable_ints(struct uart_port *port)
865{
866 port->read_status_mask =
867 in_be32(&FIFO_5125(port)->tximr) << 16 |
868 in_be32(&FIFO_5125(port)->rximr);
869 out_be32(&FIFO_5125(port)->tximr, 0);
870 out_be32(&FIFO_5125(port)->rximr, 0);
871}
872
873static void mpc5125_psc_cw_restore_ints(struct uart_port *port)
874{
875 out_be32(&FIFO_5125(port)->tximr,
876 (port->read_status_mask >> 16) & 0x7f);
877 out_be32(&FIFO_5125(port)->rximr, port->read_status_mask & 0x7f);
878}
879
880static inline void mpc5125_set_divisor(struct mpc5125_psc __iomem *psc,
881 u8 prescaler, unsigned int divisor)
882{
883 /* select prescaler */
884 out_8(&psc->mpc52xx_psc_clock_select, prescaler);
885 out_8(&psc->ctur, divisor >> 8);
886 out_8(&psc->ctlr, divisor & 0xff);
887}
888
889static unsigned int mpc5125_psc_set_baudrate(struct uart_port *port,
890 struct ktermios *new,
891 struct ktermios *old)
892{
893 unsigned int baud;
894 unsigned int divisor;
895
896 /*
897 * Calculate with a /16 prescaler here.
898 */
899
900 /* uartclk contains the ips freq */
901 baud = uart_get_baud_rate(port, new, old,
902 port->uartclk / (16 * 0xffff) + 1,
903 port->uartclk / 16);
904 divisor = (port->uartclk + 8 * baud) / (16 * baud);
905
906 /* enable the /16 prescaler and set the divisor */
907 mpc5125_set_divisor(PSC_5125(port), 0xdd, divisor);
908 return baud;
909}
910
911/*
912 * MPC5125 have compatible PSC FIFO Controller.
913 * Special init not needed.
914 */
915static u16 mpc5125_psc_get_status(struct uart_port *port)
916{
917 return in_be16(&PSC_5125(port)->mpc52xx_psc_status);
918}
919
920static u8 mpc5125_psc_get_ipcr(struct uart_port *port)
921{
922 return in_8(&PSC_5125(port)->mpc52xx_psc_ipcr);
923}
924
925static void mpc5125_psc_command(struct uart_port *port, u8 cmd)
926{
927 out_8(&PSC_5125(port)->command, cmd);
928}
929
930static void mpc5125_psc_set_mode(struct uart_port *port, u8 mr1, u8 mr2)
931{
932 out_8(&PSC_5125(port)->mr1, mr1);
933 out_8(&PSC_5125(port)->mr2, mr2);
934}
935
936static void mpc5125_psc_set_rts(struct uart_port *port, int state)
937{
938 if (state & TIOCM_RTS)
939 out_8(&PSC_5125(port)->op1, MPC52xx_PSC_OP_RTS);
940 else
941 out_8(&PSC_5125(port)->op0, MPC52xx_PSC_OP_RTS);
942}
943
944static void mpc5125_psc_enable_ms(struct uart_port *port)
945{
946 struct mpc5125_psc __iomem *psc = PSC_5125(port);
947
948 /* clear D_*-bits by reading them */
949 in_8(&psc->mpc52xx_psc_ipcr);
950 /* enable CTS and DCD as IPC interrupts */
951 out_8(&psc->mpc52xx_psc_acr, MPC52xx_PSC_IEC_CTS | MPC52xx_PSC_IEC_DCD);
952
953 port->read_status_mask |= MPC52xx_PSC_IMR_IPC;
954 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
955}
956
957static void mpc5125_psc_set_sicr(struct uart_port *port, u32 val)
958{
959 out_be32(&PSC_5125(port)->sicr, val);
960}
961
962static void mpc5125_psc_set_imr(struct uart_port *port, u16 val)
963{
964 out_be16(&PSC_5125(port)->mpc52xx_psc_imr, val);
965}
966
967static u8 mpc5125_psc_get_mr1(struct uart_port *port)
968{
969 return in_8(&PSC_5125(port)->mr1);
970}
971
972static const struct psc_ops mpc5125_psc_ops = {
973 .fifo_init = mpc5125_psc_fifo_init,
974 .raw_rx_rdy = mpc5125_psc_raw_rx_rdy,
975 .raw_tx_rdy = mpc5125_psc_raw_tx_rdy,
976 .rx_rdy = mpc5125_psc_rx_rdy,
977 .tx_rdy = mpc5125_psc_tx_rdy,
978 .tx_empty = mpc5125_psc_tx_empty,
979 .stop_rx = mpc5125_psc_stop_rx,
980 .start_tx = mpc5125_psc_start_tx,
981 .stop_tx = mpc5125_psc_stop_tx,
982 .rx_clr_irq = mpc5125_psc_rx_clr_irq,
983 .tx_clr_irq = mpc5125_psc_tx_clr_irq,
984 .write_char = mpc5125_psc_write_char,
985 .read_char = mpc5125_psc_read_char,
986 .cw_disable_ints = mpc5125_psc_cw_disable_ints,
987 .cw_restore_ints = mpc5125_psc_cw_restore_ints,
988 .set_baudrate = mpc5125_psc_set_baudrate,
989 .clock_alloc = mpc512x_psc_alloc_clock,
990 .clock_relse = mpc512x_psc_relse_clock,
991 .clock = mpc512x_psc_endis_clock,
992 .fifoc_init = mpc512x_psc_fifoc_init,
993 .fifoc_uninit = mpc512x_psc_fifoc_uninit,
994 .get_irq = mpc512x_psc_get_irq,
995 .handle_irq = mpc512x_psc_handle_irq,
996 .get_status = mpc5125_psc_get_status,
997 .get_ipcr = mpc5125_psc_get_ipcr,
998 .command = mpc5125_psc_command,
999 .set_mode = mpc5125_psc_set_mode,
1000 .set_rts = mpc5125_psc_set_rts,
1001 .enable_ms = mpc5125_psc_enable_ms,
1002 .set_sicr = mpc5125_psc_set_sicr,
1003 .set_imr = mpc5125_psc_set_imr,
1004 .get_mr1 = mpc5125_psc_get_mr1,
1005};
1006
1007static const struct psc_ops mpc512x_psc_ops = {
1008 .fifo_init = mpc512x_psc_fifo_init,
1009 .raw_rx_rdy = mpc512x_psc_raw_rx_rdy,
1010 .raw_tx_rdy = mpc512x_psc_raw_tx_rdy,
1011 .rx_rdy = mpc512x_psc_rx_rdy,
1012 .tx_rdy = mpc512x_psc_tx_rdy,
1013 .tx_empty = mpc512x_psc_tx_empty,
1014 .stop_rx = mpc512x_psc_stop_rx,
1015 .start_tx = mpc512x_psc_start_tx,
1016 .stop_tx = mpc512x_psc_stop_tx,
1017 .rx_clr_irq = mpc512x_psc_rx_clr_irq,
1018 .tx_clr_irq = mpc512x_psc_tx_clr_irq,
1019 .write_char = mpc512x_psc_write_char,
1020 .read_char = mpc512x_psc_read_char,
1021 .cw_disable_ints = mpc512x_psc_cw_disable_ints,
1022 .cw_restore_ints = mpc512x_psc_cw_restore_ints,
1023 .set_baudrate = mpc512x_psc_set_baudrate,
1024 .clock_alloc = mpc512x_psc_alloc_clock,
1025 .clock_relse = mpc512x_psc_relse_clock,
1026 .clock = mpc512x_psc_endis_clock,
1027 .fifoc_init = mpc512x_psc_fifoc_init,
1028 .fifoc_uninit = mpc512x_psc_fifoc_uninit,
1029 .get_irq = mpc512x_psc_get_irq,
1030 .handle_irq = mpc512x_psc_handle_irq,
1031 .get_status = mpc52xx_psc_get_status,
1032 .get_ipcr = mpc52xx_psc_get_ipcr,
1033 .command = mpc52xx_psc_command,
1034 .set_mode = mpc52xx_psc_set_mode,
1035 .set_rts = mpc52xx_psc_set_rts,
1036 .enable_ms = mpc52xx_psc_enable_ms,
1037 .set_sicr = mpc52xx_psc_set_sicr,
1038 .set_imr = mpc52xx_psc_set_imr,
1039 .get_mr1 = mpc52xx_psc_get_mr1,
1040};
1041#endif /* CONFIG_PPC_MPC512x */
1042
1043
1044static const struct psc_ops *psc_ops;
1045
1046/* ======================================================================== */
1047/* UART operations */
1048/* ======================================================================== */
1049
1050static unsigned int
1051mpc52xx_uart_tx_empty(struct uart_port *port)
1052{
1053 return psc_ops->tx_empty(port) ? TIOCSER_TEMT : 0;
1054}
1055
1056static void
1057mpc52xx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
1058{
1059 psc_ops->set_rts(port, mctrl & TIOCM_RTS);
1060}
1061
1062static unsigned int
1063mpc52xx_uart_get_mctrl(struct uart_port *port)
1064{
1065 unsigned int ret = TIOCM_DSR;
1066 u8 status = psc_ops->get_ipcr(port);
1067
1068 if (!(status & MPC52xx_PSC_CTS))
1069 ret |= TIOCM_CTS;
1070 if (!(status & MPC52xx_PSC_DCD))
1071 ret |= TIOCM_CAR;
1072
1073 return ret;
1074}
1075
1076static void
1077mpc52xx_uart_stop_tx(struct uart_port *port)
1078{
1079 /* port->lock taken by caller */
1080 psc_ops->stop_tx(port);
1081}
1082
1083static void
1084mpc52xx_uart_start_tx(struct uart_port *port)
1085{
1086 /* port->lock taken by caller */
1087 psc_ops->start_tx(port);
1088}
1089
1090static void
1091mpc52xx_uart_stop_rx(struct uart_port *port)
1092{
1093 /* port->lock taken by caller */
1094 psc_ops->stop_rx(port);
1095}
1096
1097static void
1098mpc52xx_uart_enable_ms(struct uart_port *port)
1099{
1100 psc_ops->enable_ms(port);
1101}
1102
1103static void
1104mpc52xx_uart_break_ctl(struct uart_port *port, int ctl)
1105{
1106 unsigned long flags;
1107 spin_lock_irqsave(&port->lock, flags);
1108
1109 if (ctl == -1)
1110 psc_ops->command(port, MPC52xx_PSC_START_BRK);
1111 else
1112 psc_ops->command(port, MPC52xx_PSC_STOP_BRK);
1113
1114 spin_unlock_irqrestore(&port->lock, flags);
1115}
1116
1117static int
1118mpc52xx_uart_startup(struct uart_port *port)
1119{
1120 int ret;
1121
1122 if (psc_ops->clock) {
1123 ret = psc_ops->clock(port, 1);
1124 if (ret)
1125 return ret;
1126 }
1127
1128 /* Request IRQ */
1129 ret = request_irq(port->irq, mpc52xx_uart_int,
1130 port->irqflags, "mpc52xx_psc_uart", port);
1131 if (ret)
1132 return ret;
1133
1134 /* Reset/activate the port, clear and enable interrupts */
1135 psc_ops->command(port, MPC52xx_PSC_RST_RX);
1136 psc_ops->command(port, MPC52xx_PSC_RST_TX);
1137
1138 /*
1139 * According to Freescale's support the RST_TX command can produce a
1140 * spike on the TX pin. So they recommend to delay "for one character".
1141 * One millisecond should be enough for everyone.
1142 */
1143 msleep(1);
1144
1145 psc_ops->set_sicr(port, 0); /* UART mode DCD ignored */
1146
1147 psc_ops->fifo_init(port);
1148
1149 psc_ops->command(port, MPC52xx_PSC_TX_ENABLE);
1150 psc_ops->command(port, MPC52xx_PSC_RX_ENABLE);
1151
1152 return 0;
1153}
1154
1155static void
1156mpc52xx_uart_shutdown(struct uart_port *port)
1157{
1158 /* Shut down the port. Leave TX active if on a console port */
1159 psc_ops->command(port, MPC52xx_PSC_RST_RX);
1160 if (!uart_console(port))
1161 psc_ops->command(port, MPC52xx_PSC_RST_TX);
1162
1163 port->read_status_mask = 0;
1164 psc_ops->set_imr(port, port->read_status_mask);
1165
1166 if (psc_ops->clock)
1167 psc_ops->clock(port, 0);
1168
1169 /* Disable interrupt */
1170 psc_ops->cw_disable_ints(port);
1171
1172 /* Release interrupt */
1173 free_irq(port->irq, port);
1174}
1175
1176static void
1177mpc52xx_uart_set_termios(struct uart_port *port, struct ktermios *new,
1178 struct ktermios *old)
1179{
1180 unsigned long flags;
1181 unsigned char mr1, mr2;
1182 unsigned int j;
1183 unsigned int baud;
1184
1185 /* Prepare what we're gonna write */
1186 mr1 = 0;
1187
1188 switch (new->c_cflag & CSIZE) {
1189 case CS5: mr1 |= MPC52xx_PSC_MODE_5_BITS;
1190 break;
1191 case CS6: mr1 |= MPC52xx_PSC_MODE_6_BITS;
1192 break;
1193 case CS7: mr1 |= MPC52xx_PSC_MODE_7_BITS;
1194 break;
1195 case CS8:
1196 default: mr1 |= MPC52xx_PSC_MODE_8_BITS;
1197 }
1198
1199 if (new->c_cflag & PARENB) {
1200 if (new->c_cflag & CMSPAR)
1201 mr1 |= MPC52xx_PSC_MODE_PARFORCE;
1202
1203 /* With CMSPAR, PARODD also means high parity (same as termios) */
1204 mr1 |= (new->c_cflag & PARODD) ?
1205 MPC52xx_PSC_MODE_PARODD : MPC52xx_PSC_MODE_PAREVEN;
1206 } else {
1207 mr1 |= MPC52xx_PSC_MODE_PARNONE;
1208 }
1209
1210 mr2 = 0;
1211
1212 if (new->c_cflag & CSTOPB)
1213 mr2 |= MPC52xx_PSC_MODE_TWO_STOP;
1214 else
1215 mr2 |= ((new->c_cflag & CSIZE) == CS5) ?
1216 MPC52xx_PSC_MODE_ONE_STOP_5_BITS :
1217 MPC52xx_PSC_MODE_ONE_STOP;
1218
1219 if (new->c_cflag & CRTSCTS) {
1220 mr1 |= MPC52xx_PSC_MODE_RXRTS;
1221 mr2 |= MPC52xx_PSC_MODE_TXCTS;
1222 }
1223
1224 /* Get the lock */
1225 spin_lock_irqsave(&port->lock, flags);
1226
1227 /* Do our best to flush TX & RX, so we don't lose anything */
1228 /* But we don't wait indefinitely ! */
1229 j = 5000000; /* Maximum wait */
1230 /* FIXME Can't receive chars since set_termios might be called at early
1231 * boot for the console, all stuff is not yet ready to receive at that
1232 * time and that just makes the kernel oops */
1233 /* while (j-- && mpc52xx_uart_int_rx_chars(port)); */
1234 while (!mpc52xx_uart_tx_empty(port) && --j)
1235 udelay(1);
1236
1237 if (!j)
1238 printk(KERN_ERR "mpc52xx_uart.c: "
1239 "Unable to flush RX & TX fifos in-time in set_termios."
1240 "Some chars may have been lost.\n");
1241
1242 /* Reset the TX & RX */
1243 psc_ops->command(port, MPC52xx_PSC_RST_RX);
1244 psc_ops->command(port, MPC52xx_PSC_RST_TX);
1245
1246 /* Send new mode settings */
1247 psc_ops->set_mode(port, mr1, mr2);
1248 baud = psc_ops->set_baudrate(port, new, old);
1249
1250 /* Update the per-port timeout */
1251 uart_update_timeout(port, new->c_cflag, baud);
1252
1253 if (UART_ENABLE_MS(port, new->c_cflag))
1254 mpc52xx_uart_enable_ms(port);
1255
1256 /* Reenable TX & RX */
1257 psc_ops->command(port, MPC52xx_PSC_TX_ENABLE);
1258 psc_ops->command(port, MPC52xx_PSC_RX_ENABLE);
1259
1260 /* We're all set, release the lock */
1261 spin_unlock_irqrestore(&port->lock, flags);
1262}
1263
1264static const char *
1265mpc52xx_uart_type(struct uart_port *port)
1266{
1267 /*
1268 * We keep using PORT_MPC52xx for historic reasons although it applies
1269 * for MPC512x, too, but print "MPC5xxx" to not irritate users
1270 */
1271 return port->type == PORT_MPC52xx ? "MPC5xxx PSC" : NULL;
1272}
1273
1274static void
1275mpc52xx_uart_release_port(struct uart_port *port)
1276{
1277 if (psc_ops->clock_relse)
1278 psc_ops->clock_relse(port);
1279
1280 /* remapped by us ? */
1281 if (port->flags & UPF_IOREMAP) {
1282 iounmap(port->membase);
1283 port->membase = NULL;
1284 }
1285
1286 release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc));
1287}
1288
1289static int
1290mpc52xx_uart_request_port(struct uart_port *port)
1291{
1292 int err;
1293
1294 if (port->flags & UPF_IOREMAP) /* Need to remap ? */
1295 port->membase = ioremap(port->mapbase,
1296 sizeof(struct mpc52xx_psc));
1297
1298 if (!port->membase)
1299 return -EINVAL;
1300
1301 err = request_mem_region(port->mapbase, sizeof(struct mpc52xx_psc),
1302 "mpc52xx_psc_uart") != NULL ? 0 : -EBUSY;
1303
1304 if (err)
1305 goto out_membase;
1306
1307 if (psc_ops->clock_alloc) {
1308 err = psc_ops->clock_alloc(port);
1309 if (err)
1310 goto out_mapregion;
1311 }
1312
1313 return 0;
1314
1315out_mapregion:
1316 release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc));
1317out_membase:
1318 if (port->flags & UPF_IOREMAP) {
1319 iounmap(port->membase);
1320 port->membase = NULL;
1321 }
1322 return err;
1323}
1324
1325static void
1326mpc52xx_uart_config_port(struct uart_port *port, int flags)
1327{
1328 if ((flags & UART_CONFIG_TYPE)
1329 && (mpc52xx_uart_request_port(port) == 0))
1330 port->type = PORT_MPC52xx;
1331}
1332
1333static int
1334mpc52xx_uart_verify_port(struct uart_port *port, struct serial_struct *ser)
1335{
1336 if (ser->type != PORT_UNKNOWN && ser->type != PORT_MPC52xx)
1337 return -EINVAL;
1338
1339 if ((ser->irq != port->irq) ||
1340 (ser->io_type != UPIO_MEM) ||
1341 (ser->baud_base != port->uartclk) ||
1342 (ser->iomem_base != (void *)port->mapbase) ||
1343 (ser->hub6 != 0))
1344 return -EINVAL;
1345
1346 return 0;
1347}
1348
1349
1350static struct uart_ops mpc52xx_uart_ops = {
1351 .tx_empty = mpc52xx_uart_tx_empty,
1352 .set_mctrl = mpc52xx_uart_set_mctrl,
1353 .get_mctrl = mpc52xx_uart_get_mctrl,
1354 .stop_tx = mpc52xx_uart_stop_tx,
1355 .start_tx = mpc52xx_uart_start_tx,
1356 .stop_rx = mpc52xx_uart_stop_rx,
1357 .enable_ms = mpc52xx_uart_enable_ms,
1358 .break_ctl = mpc52xx_uart_break_ctl,
1359 .startup = mpc52xx_uart_startup,
1360 .shutdown = mpc52xx_uart_shutdown,
1361 .set_termios = mpc52xx_uart_set_termios,
1362/* .pm = mpc52xx_uart_pm, Not supported yet */
1363 .type = mpc52xx_uart_type,
1364 .release_port = mpc52xx_uart_release_port,
1365 .request_port = mpc52xx_uart_request_port,
1366 .config_port = mpc52xx_uart_config_port,
1367 .verify_port = mpc52xx_uart_verify_port
1368};
1369
1370
1371/* ======================================================================== */
1372/* Interrupt handling */
1373/* ======================================================================== */
1374
1375static inline int
1376mpc52xx_uart_int_rx_chars(struct uart_port *port)
1377{
1378 struct tty_port *tport = &port->state->port;
1379 unsigned char ch, flag;
1380 unsigned short status;
1381
1382 /* While we can read, do so ! */
1383 while (psc_ops->raw_rx_rdy(port)) {
1384 /* Get the char */
1385 ch = psc_ops->read_char(port);
1386
1387 /* Handle sysreq char */
1388#ifdef SUPPORT_SYSRQ
1389 if (uart_handle_sysrq_char(port, ch)) {
1390 port->sysrq = 0;
1391 continue;
1392 }
1393#endif
1394
1395 /* Store it */
1396
1397 flag = TTY_NORMAL;
1398 port->icount.rx++;
1399
1400 status = psc_ops->get_status(port);
1401
1402 if (status & (MPC52xx_PSC_SR_PE |
1403 MPC52xx_PSC_SR_FE |
1404 MPC52xx_PSC_SR_RB)) {
1405
1406 if (status & MPC52xx_PSC_SR_RB) {
1407 flag = TTY_BREAK;
1408 uart_handle_break(port);
1409 port->icount.brk++;
1410 } else if (status & MPC52xx_PSC_SR_PE) {
1411 flag = TTY_PARITY;
1412 port->icount.parity++;
1413 }
1414 else if (status & MPC52xx_PSC_SR_FE) {
1415 flag = TTY_FRAME;
1416 port->icount.frame++;
1417 }
1418
1419 /* Clear error condition */
1420 psc_ops->command(port, MPC52xx_PSC_RST_ERR_STAT);
1421
1422 }
1423 tty_insert_flip_char(tport, ch, flag);
1424 if (status & MPC52xx_PSC_SR_OE) {
1425 /*
1426 * Overrun is special, since it's
1427 * reported immediately, and doesn't
1428 * affect the current character
1429 */
1430 tty_insert_flip_char(tport, 0, TTY_OVERRUN);
1431 port->icount.overrun++;
1432 }
1433 }
1434
1435 spin_unlock(&port->lock);
1436 tty_flip_buffer_push(tport);
1437 spin_lock(&port->lock);
1438
1439 return psc_ops->raw_rx_rdy(port);
1440}
1441
1442static inline int
1443mpc52xx_uart_int_tx_chars(struct uart_port *port)
1444{
1445 struct circ_buf *xmit = &port->state->xmit;
1446
1447 /* Process out of band chars */
1448 if (port->x_char) {
1449 psc_ops->write_char(port, port->x_char);
1450 port->icount.tx++;
1451 port->x_char = 0;
1452 return 1;
1453 }
1454
1455 /* Nothing to do ? */
1456 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
1457 mpc52xx_uart_stop_tx(port);
1458 return 0;
1459 }
1460
1461 /* Send chars */
1462 while (psc_ops->raw_tx_rdy(port)) {
1463 psc_ops->write_char(port, xmit->buf[xmit->tail]);
1464 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
1465 port->icount.tx++;
1466 if (uart_circ_empty(xmit))
1467 break;
1468 }
1469
1470 /* Wake up */
1471 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
1472 uart_write_wakeup(port);
1473
1474 /* Maybe we're done after all */
1475 if (uart_circ_empty(xmit)) {
1476 mpc52xx_uart_stop_tx(port);
1477 return 0;
1478 }
1479
1480 return 1;
1481}
1482
1483static irqreturn_t
1484mpc5xxx_uart_process_int(struct uart_port *port)
1485{
1486 unsigned long pass = ISR_PASS_LIMIT;
1487 unsigned int keepgoing;
1488 u8 status;
1489
1490 /* While we have stuff to do, we continue */
1491 do {
1492 /* If we don't find anything to do, we stop */
1493 keepgoing = 0;
1494
1495 psc_ops->rx_clr_irq(port);
1496 if (psc_ops->rx_rdy(port))
1497 keepgoing |= mpc52xx_uart_int_rx_chars(port);
1498
1499 psc_ops->tx_clr_irq(port);
1500 if (psc_ops->tx_rdy(port))
1501 keepgoing |= mpc52xx_uart_int_tx_chars(port);
1502
1503 status = psc_ops->get_ipcr(port);
1504 if (status & MPC52xx_PSC_D_DCD)
1505 uart_handle_dcd_change(port, !(status & MPC52xx_PSC_DCD));
1506
1507 if (status & MPC52xx_PSC_D_CTS)
1508 uart_handle_cts_change(port, !(status & MPC52xx_PSC_CTS));
1509
1510 /* Limit number of iteration */
1511 if (!(--pass))
1512 keepgoing = 0;
1513
1514 } while (keepgoing);
1515
1516 return IRQ_HANDLED;
1517}
1518
1519static irqreturn_t
1520mpc52xx_uart_int(int irq, void *dev_id)
1521{
1522 struct uart_port *port = dev_id;
1523 irqreturn_t ret;
1524
1525 spin_lock(&port->lock);
1526
1527 ret = psc_ops->handle_irq(port);
1528
1529 spin_unlock(&port->lock);
1530
1531 return ret;
1532}
1533
1534/* ======================================================================== */
1535/* Console ( if applicable ) */
1536/* ======================================================================== */
1537
1538#ifdef CONFIG_SERIAL_MPC52xx_CONSOLE
1539
1540static void __init
1541mpc52xx_console_get_options(struct uart_port *port,
1542 int *baud, int *parity, int *bits, int *flow)
1543{
1544 unsigned char mr1;
1545
1546 pr_debug("mpc52xx_console_get_options(port=%p)\n", port);
1547
1548 /* Read the mode registers */
1549 mr1 = psc_ops->get_mr1(port);
1550
1551 /* CT{U,L}R are write-only ! */
1552 *baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
1553
1554 /* Parse them */
1555 switch (mr1 & MPC52xx_PSC_MODE_BITS_MASK) {
1556 case MPC52xx_PSC_MODE_5_BITS:
1557 *bits = 5;
1558 break;
1559 case MPC52xx_PSC_MODE_6_BITS:
1560 *bits = 6;
1561 break;
1562 case MPC52xx_PSC_MODE_7_BITS:
1563 *bits = 7;
1564 break;
1565 case MPC52xx_PSC_MODE_8_BITS:
1566 default:
1567 *bits = 8;
1568 }
1569
1570 if (mr1 & MPC52xx_PSC_MODE_PARNONE)
1571 *parity = 'n';
1572 else
1573 *parity = mr1 & MPC52xx_PSC_MODE_PARODD ? 'o' : 'e';
1574}
1575
1576static void
1577mpc52xx_console_write(struct console *co, const char *s, unsigned int count)
1578{
1579 struct uart_port *port = &mpc52xx_uart_ports[co->index];
1580 unsigned int i, j;
1581
1582 /* Disable interrupts */
1583 psc_ops->cw_disable_ints(port);
1584
1585 /* Wait the TX buffer to be empty */
1586 j = 5000000; /* Maximum wait */
1587 while (!mpc52xx_uart_tx_empty(port) && --j)
1588 udelay(1);
1589
1590 /* Write all the chars */
1591 for (i = 0; i < count; i++, s++) {
1592 /* Line return handling */
1593 if (*s == '\n')
1594 psc_ops->write_char(port, '\r');
1595
1596 /* Send the char */
1597 psc_ops->write_char(port, *s);
1598
1599 /* Wait the TX buffer to be empty */
1600 j = 20000; /* Maximum wait */
1601 while (!mpc52xx_uart_tx_empty(port) && --j)
1602 udelay(1);
1603 }
1604
1605 /* Restore interrupt state */
1606 psc_ops->cw_restore_ints(port);
1607}
1608
1609
1610static int __init
1611mpc52xx_console_setup(struct console *co, char *options)
1612{
1613 struct uart_port *port = &mpc52xx_uart_ports[co->index];
1614 struct device_node *np = mpc52xx_uart_nodes[co->index];
1615 unsigned int uartclk;
1616 struct resource res;
1617 int ret;
1618
1619 int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
1620 int bits = 8;
1621 int parity = 'n';
1622 int flow = 'n';
1623
1624 pr_debug("mpc52xx_console_setup co=%p, co->index=%i, options=%s\n",
1625 co, co->index, options);
1626
1627 if ((co->index < 0) || (co->index >= MPC52xx_PSC_MAXNUM)) {
1628 pr_debug("PSC%x out of range\n", co->index);
1629 return -EINVAL;
1630 }
1631
1632 if (!np) {
1633 pr_debug("PSC%x not found in device tree\n", co->index);
1634 return -EINVAL;
1635 }
1636
1637 pr_debug("Console on ttyPSC%x is %s\n",
1638 co->index, mpc52xx_uart_nodes[co->index]->full_name);
1639
1640 /* Fetch register locations */
1641 ret = of_address_to_resource(np, 0, &res);
1642 if (ret) {
1643 pr_debug("Could not get resources for PSC%x\n", co->index);
1644 return ret;
1645 }
1646
1647 uartclk = mpc5xxx_get_bus_frequency(np);
1648 if (uartclk == 0) {
1649 pr_debug("Could not find uart clock frequency!\n");
1650 return -EINVAL;
1651 }
1652
1653 /* Basic port init. Needed since we use some uart_??? func before
1654 * real init for early access */
1655 spin_lock_init(&port->lock);
1656 port->uartclk = uartclk;
1657 port->ops = &mpc52xx_uart_ops;
1658 port->mapbase = res.start;
1659 port->membase = ioremap(res.start, sizeof(struct mpc52xx_psc));
1660 port->irq = irq_of_parse_and_map(np, 0);
1661
1662 if (port->membase == NULL)
1663 return -EINVAL;
1664
1665 pr_debug("mpc52xx-psc uart at %p, mapped to %p, irq=%x, freq=%i\n",
1666 (void *)port->mapbase, port->membase,
1667 port->irq, port->uartclk);
1668
1669 /* Setup the port parameters accoding to options */
1670 if (options)
1671 uart_parse_options(options, &baud, &parity, &bits, &flow);
1672 else
1673 mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow);
1674
1675 pr_debug("Setting console parameters: %i %i%c1 flow=%c\n",
1676 baud, bits, parity, flow);
1677
1678 return uart_set_options(port, co, baud, parity, bits, flow);
1679}
1680
1681
1682static struct uart_driver mpc52xx_uart_driver;
1683
1684static struct console mpc52xx_console = {
1685 .name = "ttyPSC",
1686 .write = mpc52xx_console_write,
1687 .device = uart_console_device,
1688 .setup = mpc52xx_console_setup,
1689 .flags = CON_PRINTBUFFER,
1690 .index = -1, /* Specified on the cmdline (e.g. console=ttyPSC0) */
1691 .data = &mpc52xx_uart_driver,
1692};
1693
1694
1695static int __init
1696mpc52xx_console_init(void)
1697{
1698 mpc52xx_uart_of_enumerate();
1699 register_console(&mpc52xx_console);
1700 return 0;
1701}
1702
1703console_initcall(mpc52xx_console_init);
1704
1705#define MPC52xx_PSC_CONSOLE &mpc52xx_console
1706#else
1707#define MPC52xx_PSC_CONSOLE NULL
1708#endif
1709
1710
1711/* ======================================================================== */
1712/* UART Driver */
1713/* ======================================================================== */
1714
1715static struct uart_driver mpc52xx_uart_driver = {
1716 .driver_name = "mpc52xx_psc_uart",
1717 .dev_name = "ttyPSC",
1718 .major = SERIAL_PSC_MAJOR,
1719 .minor = SERIAL_PSC_MINOR,
1720 .nr = MPC52xx_PSC_MAXNUM,
1721 .cons = MPC52xx_PSC_CONSOLE,
1722};
1723
1724/* ======================================================================== */
1725/* OF Platform Driver */
1726/* ======================================================================== */
1727
1728static const struct of_device_id mpc52xx_uart_of_match[] = {
1729#ifdef CONFIG_PPC_MPC52xx
1730 { .compatible = "fsl,mpc5200b-psc-uart", .data = &mpc5200b_psc_ops, },
1731 { .compatible = "fsl,mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
1732 /* binding used by old lite5200 device trees: */
1733 { .compatible = "mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
1734 /* binding used by efika: */
1735 { .compatible = "mpc5200-serial", .data = &mpc52xx_psc_ops, },
1736#endif
1737#ifdef CONFIG_PPC_MPC512x
1738 { .compatible = "fsl,mpc5121-psc-uart", .data = &mpc512x_psc_ops, },
1739 { .compatible = "fsl,mpc5125-psc-uart", .data = &mpc5125_psc_ops, },
1740#endif
1741 {},
1742};
1743
1744static int mpc52xx_uart_of_probe(struct platform_device *op)
1745{
1746 int idx = -1;
1747 unsigned int uartclk;
1748 struct uart_port *port = NULL;
1749 struct resource res;
1750 int ret;
1751
1752 /* Check validity & presence */
1753 for (idx = 0; idx < MPC52xx_PSC_MAXNUM; idx++)
1754 if (mpc52xx_uart_nodes[idx] == op->dev.of_node)
1755 break;
1756 if (idx >= MPC52xx_PSC_MAXNUM)
1757 return -EINVAL;
1758 pr_debug("Found %s assigned to ttyPSC%x\n",
1759 mpc52xx_uart_nodes[idx]->full_name, idx);
1760
1761 /* set the uart clock to the input clock of the psc, the different
1762 * prescalers are taken into account in the set_baudrate() methods
1763 * of the respective chip */
1764 uartclk = mpc5xxx_get_bus_frequency(op->dev.of_node);
1765 if (uartclk == 0) {
1766 dev_dbg(&op->dev, "Could not find uart clock frequency!\n");
1767 return -EINVAL;
1768 }
1769
1770 /* Init the port structure */
1771 port = &mpc52xx_uart_ports[idx];
1772
1773 spin_lock_init(&port->lock);
1774 port->uartclk = uartclk;
1775 port->fifosize = 512;
1776 port->iotype = UPIO_MEM;
1777 port->flags = UPF_BOOT_AUTOCONF |
1778 (uart_console(port) ? 0 : UPF_IOREMAP);
1779 port->line = idx;
1780 port->ops = &mpc52xx_uart_ops;
1781 port->dev = &op->dev;
1782
1783 /* Search for IRQ and mapbase */
1784 ret = of_address_to_resource(op->dev.of_node, 0, &res);
1785 if (ret)
1786 return ret;
1787
1788 port->mapbase = res.start;
1789 if (!port->mapbase) {
1790 dev_dbg(&op->dev, "Could not allocate resources for PSC\n");
1791 return -EINVAL;
1792 }
1793
1794 psc_ops->get_irq(port, op->dev.of_node);
1795 if (port->irq == 0) {
1796 dev_dbg(&op->dev, "Could not get irq\n");
1797 return -EINVAL;
1798 }
1799
1800 dev_dbg(&op->dev, "mpc52xx-psc uart at %p, irq=%x, freq=%i\n",
1801 (void *)port->mapbase, port->irq, port->uartclk);
1802
1803 /* Add the port to the uart sub-system */
1804 ret = uart_add_one_port(&mpc52xx_uart_driver, port);
1805 if (ret)
1806 return ret;
1807
1808 platform_set_drvdata(op, (void *)port);
1809 return 0;
1810}
1811
1812static int
1813mpc52xx_uart_of_remove(struct platform_device *op)
1814{
1815 struct uart_port *port = platform_get_drvdata(op);
1816
1817 if (port)
1818 uart_remove_one_port(&mpc52xx_uart_driver, port);
1819
1820 return 0;
1821}
1822
1823#ifdef CONFIG_PM
1824static int
1825mpc52xx_uart_of_suspend(struct platform_device *op, pm_message_t state)
1826{
1827 struct uart_port *port = platform_get_drvdata(op);
1828
1829 if (port)
1830 uart_suspend_port(&mpc52xx_uart_driver, port);
1831
1832 return 0;
1833}
1834
1835static int
1836mpc52xx_uart_of_resume(struct platform_device *op)
1837{
1838 struct uart_port *port = platform_get_drvdata(op);
1839
1840 if (port)
1841 uart_resume_port(&mpc52xx_uart_driver, port);
1842
1843 return 0;
1844}
1845#endif
1846
1847static void
1848mpc52xx_uart_of_assign(struct device_node *np)
1849{
1850 int i;
1851
1852 /* Find the first free PSC number */
1853 for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
1854 if (mpc52xx_uart_nodes[i] == NULL) {
1855 of_node_get(np);
1856 mpc52xx_uart_nodes[i] = np;
1857 return;
1858 }
1859 }
1860}
1861
1862static void
1863mpc52xx_uart_of_enumerate(void)
1864{
1865 static int enum_done;
1866 struct device_node *np;
1867 const struct of_device_id *match;
1868 int i;
1869
1870 if (enum_done)
1871 return;
1872
1873 /* Assign index to each PSC in device tree */
1874 for_each_matching_node(np, mpc52xx_uart_of_match) {
1875 match = of_match_node(mpc52xx_uart_of_match, np);
1876 psc_ops = match->data;
1877 mpc52xx_uart_of_assign(np);
1878 }
1879
1880 enum_done = 1;
1881
1882 for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
1883 if (mpc52xx_uart_nodes[i])
1884 pr_debug("%s assigned to ttyPSC%x\n",
1885 mpc52xx_uart_nodes[i]->full_name, i);
1886 }
1887}
1888
1889MODULE_DEVICE_TABLE(of, mpc52xx_uart_of_match);
1890
1891static struct platform_driver mpc52xx_uart_of_driver = {
1892 .probe = mpc52xx_uart_of_probe,
1893 .remove = mpc52xx_uart_of_remove,
1894#ifdef CONFIG_PM
1895 .suspend = mpc52xx_uart_of_suspend,
1896 .resume = mpc52xx_uart_of_resume,
1897#endif
1898 .driver = {
1899 .name = "mpc52xx-psc-uart",
1900 .of_match_table = mpc52xx_uart_of_match,
1901 },
1902};
1903
1904
1905/* ======================================================================== */
1906/* Module */
1907/* ======================================================================== */
1908
1909static int __init
1910mpc52xx_uart_init(void)
1911{
1912 int ret;
1913
1914 printk(KERN_INFO "Serial: MPC52xx PSC UART driver\n");
1915
1916 ret = uart_register_driver(&mpc52xx_uart_driver);
1917 if (ret) {
1918 printk(KERN_ERR "%s: uart_register_driver failed (%i)\n",
1919 __FILE__, ret);
1920 return ret;
1921 }
1922
1923 mpc52xx_uart_of_enumerate();
1924
1925 /*
1926 * Map the PSC FIFO Controller and init if on MPC512x.
1927 */
1928 if (psc_ops && psc_ops->fifoc_init) {
1929 ret = psc_ops->fifoc_init();
1930 if (ret)
1931 goto err_init;
1932 }
1933
1934 ret = platform_driver_register(&mpc52xx_uart_of_driver);
1935 if (ret) {
1936 printk(KERN_ERR "%s: platform_driver_register failed (%i)\n",
1937 __FILE__, ret);
1938 goto err_reg;
1939 }
1940
1941 return 0;
1942err_reg:
1943 if (psc_ops && psc_ops->fifoc_uninit)
1944 psc_ops->fifoc_uninit();
1945err_init:
1946 uart_unregister_driver(&mpc52xx_uart_driver);
1947 return ret;
1948}
1949
1950static void __exit
1951mpc52xx_uart_exit(void)
1952{
1953 if (psc_ops->fifoc_uninit)
1954 psc_ops->fifoc_uninit();
1955
1956 platform_driver_unregister(&mpc52xx_uart_of_driver);
1957 uart_unregister_driver(&mpc52xx_uart_driver);
1958}
1959
1960
1961module_init(mpc52xx_uart_init);
1962module_exit(mpc52xx_uart_exit);
1963
1964MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
1965MODULE_DESCRIPTION("Freescale MPC52xx PSC UART");
1966MODULE_LICENSE("GPL");