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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// SPDX-License-Identifier: GPL-2.0
2/*
3 * Driver for the PSC of the Freescale MPC52xx PSCs configured as UARTs.
4 *
5 * FIXME According to the usermanual the status bits in the status register
6 * are only updated when the peripherals access the FIFO and not when the
7 * CPU access them. So since we use this bits to know when we stop writing
8 * and reading, they may not be updated in-time and a race condition may
9 * exists. But I haven't be able to prove this and I don't care. But if
10 * any problem arises, it might worth checking. The TX/RX FIFO Stats
11 * registers should be used in addition.
12 * Update: Actually, they seem updated ... At least the bits we use.
13 *
14 *
15 * Maintainer : Sylvain Munaut <tnt@246tNt.com>
16 *
17 * Some of the code has been inspired/copied from the 2.4 code written
18 * by Dale Farnsworth <dfarnsworth@mvista.com>.
19 *
20 * Copyright (C) 2008 Freescale Semiconductor Inc.
21 * John Rigby <jrigby@gmail.com>
22 * Added support for MPC5121
23 * Copyright (C) 2006 Secret Lab Technologies Ltd.
24 * Grant Likely <grant.likely@secretlab.ca>
25 * Copyright (C) 2004-2006 Sylvain Munaut <tnt@246tNt.com>
26 * Copyright (C) 2003 MontaVista, Software, Inc.
27 */
28
29#undef DEBUG
30
31#include <linux/device.h>
32#include <linux/module.h>
33#include <linux/tty.h>
34#include <linux/tty_flip.h>
35#include <linux/serial.h>
36#include <linux/sysrq.h>
37#include <linux/console.h>
38#include <linux/delay.h>
39#include <linux/io.h>
40#include <linux/of.h>
41#include <linux/of_platform.h>
42#include <linux/clk.h>
43
44#include <asm/mpc52xx.h>
45#include <asm/mpc52xx_psc.h>
46
47#if defined(CONFIG_SERIAL_MPC52xx_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
48#define SUPPORT_SYSRQ
49#endif
50
51#include <linux/serial_core.h>
52
53
54/* We've been assigned a range on the "Low-density serial ports" major */
55#define SERIAL_PSC_MAJOR 204
56#define SERIAL_PSC_MINOR 148
57
58
59#define ISR_PASS_LIMIT 256 /* Max number of iteration in the interrupt */
60
61
62static struct uart_port mpc52xx_uart_ports[MPC52xx_PSC_MAXNUM];
63 /* Rem: - We use the read_status_mask as a shadow of
64 * psc->mpc52xx_psc_imr
65 * - It's important that is array is all zero on start as we
66 * use it to know if it's initialized or not ! If it's not sure
67 * it's cleared, then a memset(...,0,...) should be added to
68 * the console_init
69 */
70
71/* lookup table for matching device nodes to index numbers */
72static struct device_node *mpc52xx_uart_nodes[MPC52xx_PSC_MAXNUM];
73
74static void mpc52xx_uart_of_enumerate(void);
75
76
77#define PSC(port) ((struct mpc52xx_psc __iomem *)((port)->membase))
78
79
80/* Forward declaration of the interruption handling routine */
81static irqreturn_t mpc52xx_uart_int(int irq, void *dev_id);
82static irqreturn_t mpc5xxx_uart_process_int(struct uart_port *port);
83
84/* ======================================================================== */
85/* PSC fifo operations for isolating differences between 52xx and 512x */
86/* ======================================================================== */
87
88struct psc_ops {
89 void (*fifo_init)(struct uart_port *port);
90 int (*raw_rx_rdy)(struct uart_port *port);
91 int (*raw_tx_rdy)(struct uart_port *port);
92 int (*rx_rdy)(struct uart_port *port);
93 int (*tx_rdy)(struct uart_port *port);
94 int (*tx_empty)(struct uart_port *port);
95 void (*stop_rx)(struct uart_port *port);
96 void (*start_tx)(struct uart_port *port);
97 void (*stop_tx)(struct uart_port *port);
98 void (*rx_clr_irq)(struct uart_port *port);
99 void (*tx_clr_irq)(struct uart_port *port);
100 void (*write_char)(struct uart_port *port, unsigned char c);
101 unsigned char (*read_char)(struct uart_port *port);
102 void (*cw_disable_ints)(struct uart_port *port);
103 void (*cw_restore_ints)(struct uart_port *port);
104 unsigned int (*set_baudrate)(struct uart_port *port,
105 struct ktermios *new,
106 struct ktermios *old);
107 int (*clock_alloc)(struct uart_port *port);
108 void (*clock_relse)(struct uart_port *port);
109 int (*clock)(struct uart_port *port, int enable);
110 int (*fifoc_init)(void);
111 void (*fifoc_uninit)(void);
112 void (*get_irq)(struct uart_port *, struct device_node *);
113 irqreturn_t (*handle_irq)(struct uart_port *port);
114 u16 (*get_status)(struct uart_port *port);
115 u8 (*get_ipcr)(struct uart_port *port);
116 void (*command)(struct uart_port *port, u8 cmd);
117 void (*set_mode)(struct uart_port *port, u8 mr1, u8 mr2);
118 void (*set_rts)(struct uart_port *port, int state);
119 void (*enable_ms)(struct uart_port *port);
120 void (*set_sicr)(struct uart_port *port, u32 val);
121 void (*set_imr)(struct uart_port *port, u16 val);
122 u8 (*get_mr1)(struct uart_port *port);
123};
124
125/* setting the prescaler and divisor reg is common for all chips */
126static inline void mpc52xx_set_divisor(struct mpc52xx_psc __iomem *psc,
127 u16 prescaler, unsigned int divisor)
128{
129 /* select prescaler */
130 out_be16(&psc->mpc52xx_psc_clock_select, prescaler);
131 out_8(&psc->ctur, divisor >> 8);
132 out_8(&psc->ctlr, divisor & 0xff);
133}
134
135static u16 mpc52xx_psc_get_status(struct uart_port *port)
136{
137 return in_be16(&PSC(port)->mpc52xx_psc_status);
138}
139
140static u8 mpc52xx_psc_get_ipcr(struct uart_port *port)
141{
142 return in_8(&PSC(port)->mpc52xx_psc_ipcr);
143}
144
145static void mpc52xx_psc_command(struct uart_port *port, u8 cmd)
146{
147 out_8(&PSC(port)->command, cmd);
148}
149
150static void mpc52xx_psc_set_mode(struct uart_port *port, u8 mr1, u8 mr2)
151{
152 out_8(&PSC(port)->command, MPC52xx_PSC_SEL_MODE_REG_1);
153 out_8(&PSC(port)->mode, mr1);
154 out_8(&PSC(port)->mode, mr2);
155}
156
157static void mpc52xx_psc_set_rts(struct uart_port *port, int state)
158{
159 if (state)
160 out_8(&PSC(port)->op1, MPC52xx_PSC_OP_RTS);
161 else
162 out_8(&PSC(port)->op0, MPC52xx_PSC_OP_RTS);
163}
164
165static void mpc52xx_psc_enable_ms(struct uart_port *port)
166{
167 struct mpc52xx_psc __iomem *psc = PSC(port);
168
169 /* clear D_*-bits by reading them */
170 in_8(&psc->mpc52xx_psc_ipcr);
171 /* enable CTS and DCD as IPC interrupts */
172 out_8(&psc->mpc52xx_psc_acr, MPC52xx_PSC_IEC_CTS | MPC52xx_PSC_IEC_DCD);
173
174 port->read_status_mask |= MPC52xx_PSC_IMR_IPC;
175 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
176}
177
178static void mpc52xx_psc_set_sicr(struct uart_port *port, u32 val)
179{
180 out_be32(&PSC(port)->sicr, val);
181}
182
183static void mpc52xx_psc_set_imr(struct uart_port *port, u16 val)
184{
185 out_be16(&PSC(port)->mpc52xx_psc_imr, val);
186}
187
188static u8 mpc52xx_psc_get_mr1(struct uart_port *port)
189{
190 out_8(&PSC(port)->command, MPC52xx_PSC_SEL_MODE_REG_1);
191 return in_8(&PSC(port)->mode);
192}
193
194#ifdef CONFIG_PPC_MPC52xx
195#define FIFO_52xx(port) ((struct mpc52xx_psc_fifo __iomem *)(PSC(port)+1))
196static void mpc52xx_psc_fifo_init(struct uart_port *port)
197{
198 struct mpc52xx_psc __iomem *psc = PSC(port);
199 struct mpc52xx_psc_fifo __iomem *fifo = FIFO_52xx(port);
200
201 out_8(&fifo->rfcntl, 0x00);
202 out_be16(&fifo->rfalarm, 0x1ff);
203 out_8(&fifo->tfcntl, 0x07);
204 out_be16(&fifo->tfalarm, 0x80);
205
206 port->read_status_mask |= MPC52xx_PSC_IMR_RXRDY | MPC52xx_PSC_IMR_TXRDY;
207 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
208}
209
210static int mpc52xx_psc_raw_rx_rdy(struct uart_port *port)
211{
212 return in_be16(&PSC(port)->mpc52xx_psc_status)
213 & MPC52xx_PSC_SR_RXRDY;
214}
215
216static int mpc52xx_psc_raw_tx_rdy(struct uart_port *port)
217{
218 return in_be16(&PSC(port)->mpc52xx_psc_status)
219 & MPC52xx_PSC_SR_TXRDY;
220}
221
222
223static int mpc52xx_psc_rx_rdy(struct uart_port *port)
224{
225 return in_be16(&PSC(port)->mpc52xx_psc_isr)
226 & port->read_status_mask
227 & MPC52xx_PSC_IMR_RXRDY;
228}
229
230static int mpc52xx_psc_tx_rdy(struct uart_port *port)
231{
232 return in_be16(&PSC(port)->mpc52xx_psc_isr)
233 & port->read_status_mask
234 & MPC52xx_PSC_IMR_TXRDY;
235}
236
237static int mpc52xx_psc_tx_empty(struct uart_port *port)
238{
239 u16 sts = in_be16(&PSC(port)->mpc52xx_psc_status);
240
241 return (sts & MPC52xx_PSC_SR_TXEMP) ? TIOCSER_TEMT : 0;
242}
243
244static void mpc52xx_psc_start_tx(struct uart_port *port)
245{
246 port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY;
247 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
248}
249
250static void mpc52xx_psc_stop_tx(struct uart_port *port)
251{
252 port->read_status_mask &= ~MPC52xx_PSC_IMR_TXRDY;
253 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
254}
255
256static void mpc52xx_psc_stop_rx(struct uart_port *port)
257{
258 port->read_status_mask &= ~MPC52xx_PSC_IMR_RXRDY;
259 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
260}
261
262static void mpc52xx_psc_rx_clr_irq(struct uart_port *port)
263{
264}
265
266static void mpc52xx_psc_tx_clr_irq(struct uart_port *port)
267{
268}
269
270static void mpc52xx_psc_write_char(struct uart_port *port, unsigned char c)
271{
272 out_8(&PSC(port)->mpc52xx_psc_buffer_8, c);
273}
274
275static unsigned char mpc52xx_psc_read_char(struct uart_port *port)
276{
277 return in_8(&PSC(port)->mpc52xx_psc_buffer_8);
278}
279
280static void mpc52xx_psc_cw_disable_ints(struct uart_port *port)
281{
282 out_be16(&PSC(port)->mpc52xx_psc_imr, 0);
283}
284
285static void mpc52xx_psc_cw_restore_ints(struct uart_port *port)
286{
287 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
288}
289
290static unsigned int mpc5200_psc_set_baudrate(struct uart_port *port,
291 struct ktermios *new,
292 struct ktermios *old)
293{
294 unsigned int baud;
295 unsigned int divisor;
296
297 /* The 5200 has a fixed /32 prescaler, uartclk contains the ipb freq */
298 baud = uart_get_baud_rate(port, new, old,
299 port->uartclk / (32 * 0xffff) + 1,
300 port->uartclk / 32);
301 divisor = (port->uartclk + 16 * baud) / (32 * baud);
302
303 /* enable the /32 prescaler and set the divisor */
304 mpc52xx_set_divisor(PSC(port), 0xdd00, divisor);
305 return baud;
306}
307
308static unsigned int mpc5200b_psc_set_baudrate(struct uart_port *port,
309 struct ktermios *new,
310 struct ktermios *old)
311{
312 unsigned int baud;
313 unsigned int divisor;
314 u16 prescaler;
315
316 /* The 5200B has a selectable /4 or /32 prescaler, uartclk contains the
317 * ipb freq */
318 baud = uart_get_baud_rate(port, new, old,
319 port->uartclk / (32 * 0xffff) + 1,
320 port->uartclk / 4);
321 divisor = (port->uartclk + 2 * baud) / (4 * baud);
322
323 /* select the proper prescaler and set the divisor
324 * prefer high prescaler for more tolerance on low baudrates */
325 if (divisor > 0xffff || baud <= 115200) {
326 divisor = (divisor + 4) / 8;
327 prescaler = 0xdd00; /* /32 */
328 } else
329 prescaler = 0xff00; /* /4 */
330 mpc52xx_set_divisor(PSC(port), prescaler, divisor);
331 return baud;
332}
333
334static void mpc52xx_psc_get_irq(struct uart_port *port, struct device_node *np)
335{
336 port->irqflags = 0;
337 port->irq = irq_of_parse_and_map(np, 0);
338}
339
340/* 52xx specific interrupt handler. The caller holds the port lock */
341static irqreturn_t mpc52xx_psc_handle_irq(struct uart_port *port)
342{
343 return mpc5xxx_uart_process_int(port);
344}
345
346static const struct psc_ops mpc52xx_psc_ops = {
347 .fifo_init = mpc52xx_psc_fifo_init,
348 .raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
349 .raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
350 .rx_rdy = mpc52xx_psc_rx_rdy,
351 .tx_rdy = mpc52xx_psc_tx_rdy,
352 .tx_empty = mpc52xx_psc_tx_empty,
353 .stop_rx = mpc52xx_psc_stop_rx,
354 .start_tx = mpc52xx_psc_start_tx,
355 .stop_tx = mpc52xx_psc_stop_tx,
356 .rx_clr_irq = mpc52xx_psc_rx_clr_irq,
357 .tx_clr_irq = mpc52xx_psc_tx_clr_irq,
358 .write_char = mpc52xx_psc_write_char,
359 .read_char = mpc52xx_psc_read_char,
360 .cw_disable_ints = mpc52xx_psc_cw_disable_ints,
361 .cw_restore_ints = mpc52xx_psc_cw_restore_ints,
362 .set_baudrate = mpc5200_psc_set_baudrate,
363 .get_irq = mpc52xx_psc_get_irq,
364 .handle_irq = mpc52xx_psc_handle_irq,
365 .get_status = mpc52xx_psc_get_status,
366 .get_ipcr = mpc52xx_psc_get_ipcr,
367 .command = mpc52xx_psc_command,
368 .set_mode = mpc52xx_psc_set_mode,
369 .set_rts = mpc52xx_psc_set_rts,
370 .enable_ms = mpc52xx_psc_enable_ms,
371 .set_sicr = mpc52xx_psc_set_sicr,
372 .set_imr = mpc52xx_psc_set_imr,
373 .get_mr1 = mpc52xx_psc_get_mr1,
374};
375
376static const struct psc_ops mpc5200b_psc_ops = {
377 .fifo_init = mpc52xx_psc_fifo_init,
378 .raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
379 .raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
380 .rx_rdy = mpc52xx_psc_rx_rdy,
381 .tx_rdy = mpc52xx_psc_tx_rdy,
382 .tx_empty = mpc52xx_psc_tx_empty,
383 .stop_rx = mpc52xx_psc_stop_rx,
384 .start_tx = mpc52xx_psc_start_tx,
385 .stop_tx = mpc52xx_psc_stop_tx,
386 .rx_clr_irq = mpc52xx_psc_rx_clr_irq,
387 .tx_clr_irq = mpc52xx_psc_tx_clr_irq,
388 .write_char = mpc52xx_psc_write_char,
389 .read_char = mpc52xx_psc_read_char,
390 .cw_disable_ints = mpc52xx_psc_cw_disable_ints,
391 .cw_restore_ints = mpc52xx_psc_cw_restore_ints,
392 .set_baudrate = mpc5200b_psc_set_baudrate,
393 .get_irq = mpc52xx_psc_get_irq,
394 .handle_irq = mpc52xx_psc_handle_irq,
395 .get_status = mpc52xx_psc_get_status,
396 .get_ipcr = mpc52xx_psc_get_ipcr,
397 .command = mpc52xx_psc_command,
398 .set_mode = mpc52xx_psc_set_mode,
399 .set_rts = mpc52xx_psc_set_rts,
400 .enable_ms = mpc52xx_psc_enable_ms,
401 .set_sicr = mpc52xx_psc_set_sicr,
402 .set_imr = mpc52xx_psc_set_imr,
403 .get_mr1 = mpc52xx_psc_get_mr1,
404};
405
406#endif /* CONFIG_PPC_MPC52xx */
407
408#ifdef CONFIG_PPC_MPC512x
409#define FIFO_512x(port) ((struct mpc512x_psc_fifo __iomem *)(PSC(port)+1))
410
411/* PSC FIFO Controller for mpc512x */
412struct psc_fifoc {
413 u32 fifoc_cmd;
414 u32 fifoc_int;
415 u32 fifoc_dma;
416 u32 fifoc_axe;
417 u32 fifoc_debug;
418};
419
420static struct psc_fifoc __iomem *psc_fifoc;
421static unsigned int psc_fifoc_irq;
422static struct clk *psc_fifoc_clk;
423
424static void mpc512x_psc_fifo_init(struct uart_port *port)
425{
426 /* /32 prescaler */
427 out_be16(&PSC(port)->mpc52xx_psc_clock_select, 0xdd00);
428
429 out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_RESET_SLICE);
430 out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
431 out_be32(&FIFO_512x(port)->txalarm, 1);
432 out_be32(&FIFO_512x(port)->tximr, 0);
433
434 out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_RESET_SLICE);
435 out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
436 out_be32(&FIFO_512x(port)->rxalarm, 1);
437 out_be32(&FIFO_512x(port)->rximr, 0);
438
439 out_be32(&FIFO_512x(port)->tximr, MPC512x_PSC_FIFO_ALARM);
440 out_be32(&FIFO_512x(port)->rximr, MPC512x_PSC_FIFO_ALARM);
441}
442
443static int mpc512x_psc_raw_rx_rdy(struct uart_port *port)
444{
445 return !(in_be32(&FIFO_512x(port)->rxsr) & MPC512x_PSC_FIFO_EMPTY);
446}
447
448static int mpc512x_psc_raw_tx_rdy(struct uart_port *port)
449{
450 return !(in_be32(&FIFO_512x(port)->txsr) & MPC512x_PSC_FIFO_FULL);
451}
452
453static int mpc512x_psc_rx_rdy(struct uart_port *port)
454{
455 return in_be32(&FIFO_512x(port)->rxsr)
456 & in_be32(&FIFO_512x(port)->rximr)
457 & MPC512x_PSC_FIFO_ALARM;
458}
459
460static int mpc512x_psc_tx_rdy(struct uart_port *port)
461{
462 return in_be32(&FIFO_512x(port)->txsr)
463 & in_be32(&FIFO_512x(port)->tximr)
464 & MPC512x_PSC_FIFO_ALARM;
465}
466
467static int mpc512x_psc_tx_empty(struct uart_port *port)
468{
469 return in_be32(&FIFO_512x(port)->txsr)
470 & MPC512x_PSC_FIFO_EMPTY;
471}
472
473static void mpc512x_psc_stop_rx(struct uart_port *port)
474{
475 unsigned long rx_fifo_imr;
476
477 rx_fifo_imr = in_be32(&FIFO_512x(port)->rximr);
478 rx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
479 out_be32(&FIFO_512x(port)->rximr, rx_fifo_imr);
480}
481
482static void mpc512x_psc_start_tx(struct uart_port *port)
483{
484 unsigned long tx_fifo_imr;
485
486 tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
487 tx_fifo_imr |= MPC512x_PSC_FIFO_ALARM;
488 out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
489}
490
491static void mpc512x_psc_stop_tx(struct uart_port *port)
492{
493 unsigned long tx_fifo_imr;
494
495 tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
496 tx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
497 out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
498}
499
500static void mpc512x_psc_rx_clr_irq(struct uart_port *port)
501{
502 out_be32(&FIFO_512x(port)->rxisr, in_be32(&FIFO_512x(port)->rxisr));
503}
504
505static void mpc512x_psc_tx_clr_irq(struct uart_port *port)
506{
507 out_be32(&FIFO_512x(port)->txisr, in_be32(&FIFO_512x(port)->txisr));
508}
509
510static void mpc512x_psc_write_char(struct uart_port *port, unsigned char c)
511{
512 out_8(&FIFO_512x(port)->txdata_8, c);
513}
514
515static unsigned char mpc512x_psc_read_char(struct uart_port *port)
516{
517 return in_8(&FIFO_512x(port)->rxdata_8);
518}
519
520static void mpc512x_psc_cw_disable_ints(struct uart_port *port)
521{
522 port->read_status_mask =
523 in_be32(&FIFO_512x(port)->tximr) << 16 |
524 in_be32(&FIFO_512x(port)->rximr);
525 out_be32(&FIFO_512x(port)->tximr, 0);
526 out_be32(&FIFO_512x(port)->rximr, 0);
527}
528
529static void mpc512x_psc_cw_restore_ints(struct uart_port *port)
530{
531 out_be32(&FIFO_512x(port)->tximr,
532 (port->read_status_mask >> 16) & 0x7f);
533 out_be32(&FIFO_512x(port)->rximr, port->read_status_mask & 0x7f);
534}
535
536static unsigned int mpc512x_psc_set_baudrate(struct uart_port *port,
537 struct ktermios *new,
538 struct ktermios *old)
539{
540 unsigned int baud;
541 unsigned int divisor;
542
543 /*
544 * The "MPC5121e Microcontroller Reference Manual, Rev. 3" says on
545 * pg. 30-10 that the chip supports a /32 and a /10 prescaler.
546 * Furthermore, it states that "After reset, the prescaler by 10
547 * for the UART mode is selected", but the reset register value is
548 * 0x0000 which means a /32 prescaler. This is wrong.
549 *
550 * In reality using /32 prescaler doesn't work, as it is not supported!
551 * Use /16 or /10 prescaler, see "MPC5121e Hardware Design Guide",
552 * Chapter 4.1 PSC in UART Mode.
553 * Calculate with a /16 prescaler here.
554 */
555
556 /* uartclk contains the ips freq */
557 baud = uart_get_baud_rate(port, new, old,
558 port->uartclk / (16 * 0xffff) + 1,
559 port->uartclk / 16);
560 divisor = (port->uartclk + 8 * baud) / (16 * baud);
561
562 /* enable the /16 prescaler and set the divisor */
563 mpc52xx_set_divisor(PSC(port), 0xdd00, divisor);
564 return baud;
565}
566
567/* Init PSC FIFO Controller */
568static int __init mpc512x_psc_fifoc_init(void)
569{
570 int err;
571 struct device_node *np;
572 struct clk *clk;
573
574 /* default error code, potentially overwritten by clock calls */
575 err = -ENODEV;
576
577 np = of_find_compatible_node(NULL, NULL,
578 "fsl,mpc5121-psc-fifo");
579 if (!np) {
580 pr_err("%s: Can't find FIFOC node\n", __func__);
581 goto out_err;
582 }
583
584 clk = of_clk_get(np, 0);
585 if (IS_ERR(clk)) {
586 /* backwards compat with device trees that lack clock specs */
587 clk = clk_get_sys(np->name, "ipg");
588 }
589 if (IS_ERR(clk)) {
590 pr_err("%s: Can't lookup FIFO clock\n", __func__);
591 err = PTR_ERR(clk);
592 goto out_ofnode_put;
593 }
594 if (clk_prepare_enable(clk)) {
595 pr_err("%s: Can't enable FIFO clock\n", __func__);
596 clk_put(clk);
597 goto out_ofnode_put;
598 }
599 psc_fifoc_clk = clk;
600
601 psc_fifoc = of_iomap(np, 0);
602 if (!psc_fifoc) {
603 pr_err("%s: Can't map FIFOC\n", __func__);
604 goto out_clk_disable;
605 }
606
607 psc_fifoc_irq = irq_of_parse_and_map(np, 0);
608 if (psc_fifoc_irq == 0) {
609 pr_err("%s: Can't get FIFOC irq\n", __func__);
610 goto out_unmap;
611 }
612
613 of_node_put(np);
614 return 0;
615
616out_unmap:
617 iounmap(psc_fifoc);
618out_clk_disable:
619 clk_disable_unprepare(psc_fifoc_clk);
620 clk_put(psc_fifoc_clk);
621out_ofnode_put:
622 of_node_put(np);
623out_err:
624 return err;
625}
626
627static void __exit mpc512x_psc_fifoc_uninit(void)
628{
629 iounmap(psc_fifoc);
630
631 /* disable the clock, errors are not fatal */
632 if (psc_fifoc_clk) {
633 clk_disable_unprepare(psc_fifoc_clk);
634 clk_put(psc_fifoc_clk);
635 psc_fifoc_clk = NULL;
636 }
637}
638
639/* 512x specific interrupt handler. The caller holds the port lock */
640static irqreturn_t mpc512x_psc_handle_irq(struct uart_port *port)
641{
642 unsigned long fifoc_int;
643 int psc_num;
644
645 /* Read pending PSC FIFOC interrupts */
646 fifoc_int = in_be32(&psc_fifoc->fifoc_int);
647
648 /* Check if it is an interrupt for this port */
649 psc_num = (port->mapbase & 0xf00) >> 8;
650 if (test_bit(psc_num, &fifoc_int) ||
651 test_bit(psc_num + 16, &fifoc_int))
652 return mpc5xxx_uart_process_int(port);
653
654 return IRQ_NONE;
655}
656
657static struct clk *psc_mclk_clk[MPC52xx_PSC_MAXNUM];
658static struct clk *psc_ipg_clk[MPC52xx_PSC_MAXNUM];
659
660/* called from within the .request_port() callback (allocation) */
661static int mpc512x_psc_alloc_clock(struct uart_port *port)
662{
663 int psc_num;
664 struct clk *clk;
665 int err;
666
667 psc_num = (port->mapbase & 0xf00) >> 8;
668
669 clk = devm_clk_get(port->dev, "mclk");
670 if (IS_ERR(clk)) {
671 dev_err(port->dev, "Failed to get MCLK!\n");
672 err = PTR_ERR(clk);
673 goto out_err;
674 }
675 err = clk_prepare_enable(clk);
676 if (err) {
677 dev_err(port->dev, "Failed to enable MCLK!\n");
678 goto out_err;
679 }
680 psc_mclk_clk[psc_num] = clk;
681
682 clk = devm_clk_get(port->dev, "ipg");
683 if (IS_ERR(clk)) {
684 dev_err(port->dev, "Failed to get IPG clock!\n");
685 err = PTR_ERR(clk);
686 goto out_err;
687 }
688 err = clk_prepare_enable(clk);
689 if (err) {
690 dev_err(port->dev, "Failed to enable IPG clock!\n");
691 goto out_err;
692 }
693 psc_ipg_clk[psc_num] = clk;
694
695 return 0;
696
697out_err:
698 if (psc_mclk_clk[psc_num]) {
699 clk_disable_unprepare(psc_mclk_clk[psc_num]);
700 psc_mclk_clk[psc_num] = NULL;
701 }
702 if (psc_ipg_clk[psc_num]) {
703 clk_disable_unprepare(psc_ipg_clk[psc_num]);
704 psc_ipg_clk[psc_num] = NULL;
705 }
706 return err;
707}
708
709/* called from within the .release_port() callback (release) */
710static void mpc512x_psc_relse_clock(struct uart_port *port)
711{
712 int psc_num;
713 struct clk *clk;
714
715 psc_num = (port->mapbase & 0xf00) >> 8;
716 clk = psc_mclk_clk[psc_num];
717 if (clk) {
718 clk_disable_unprepare(clk);
719 psc_mclk_clk[psc_num] = NULL;
720 }
721 if (psc_ipg_clk[psc_num]) {
722 clk_disable_unprepare(psc_ipg_clk[psc_num]);
723 psc_ipg_clk[psc_num] = NULL;
724 }
725}
726
727/* implementation of the .clock() callback (enable/disable) */
728static int mpc512x_psc_endis_clock(struct uart_port *port, int enable)
729{
730 int psc_num;
731 struct clk *psc_clk;
732 int ret;
733
734 if (uart_console(port))
735 return 0;
736
737 psc_num = (port->mapbase & 0xf00) >> 8;
738 psc_clk = psc_mclk_clk[psc_num];
739 if (!psc_clk) {
740 dev_err(port->dev, "Failed to get PSC clock entry!\n");
741 return -ENODEV;
742 }
743
744 dev_dbg(port->dev, "mclk %sable\n", enable ? "en" : "dis");
745 if (enable) {
746 ret = clk_enable(psc_clk);
747 if (ret)
748 dev_err(port->dev, "Failed to enable MCLK!\n");
749 return ret;
750 } else {
751 clk_disable(psc_clk);
752 return 0;
753 }
754}
755
756static void mpc512x_psc_get_irq(struct uart_port *port, struct device_node *np)
757{
758 port->irqflags = IRQF_SHARED;
759 port->irq = psc_fifoc_irq;
760}
761#endif
762
763#ifdef CONFIG_PPC_MPC512x
764
765#define PSC_5125(port) ((struct mpc5125_psc __iomem *)((port)->membase))
766#define FIFO_5125(port) ((struct mpc512x_psc_fifo __iomem *)(PSC_5125(port)+1))
767
768static void mpc5125_psc_fifo_init(struct uart_port *port)
769{
770 /* /32 prescaler */
771 out_8(&PSC_5125(port)->mpc52xx_psc_clock_select, 0xdd);
772
773 out_be32(&FIFO_5125(port)->txcmd, MPC512x_PSC_FIFO_RESET_SLICE);
774 out_be32(&FIFO_5125(port)->txcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
775 out_be32(&FIFO_5125(port)->txalarm, 1);
776 out_be32(&FIFO_5125(port)->tximr, 0);
777
778 out_be32(&FIFO_5125(port)->rxcmd, MPC512x_PSC_FIFO_RESET_SLICE);
779 out_be32(&FIFO_5125(port)->rxcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
780 out_be32(&FIFO_5125(port)->rxalarm, 1);
781 out_be32(&FIFO_5125(port)->rximr, 0);
782
783 out_be32(&FIFO_5125(port)->tximr, MPC512x_PSC_FIFO_ALARM);
784 out_be32(&FIFO_5125(port)->rximr, MPC512x_PSC_FIFO_ALARM);
785}
786
787static int mpc5125_psc_raw_rx_rdy(struct uart_port *port)
788{
789 return !(in_be32(&FIFO_5125(port)->rxsr) & MPC512x_PSC_FIFO_EMPTY);
790}
791
792static int mpc5125_psc_raw_tx_rdy(struct uart_port *port)
793{
794 return !(in_be32(&FIFO_5125(port)->txsr) & MPC512x_PSC_FIFO_FULL);
795}
796
797static int mpc5125_psc_rx_rdy(struct uart_port *port)
798{
799 return in_be32(&FIFO_5125(port)->rxsr) &
800 in_be32(&FIFO_5125(port)->rximr) & MPC512x_PSC_FIFO_ALARM;
801}
802
803static int mpc5125_psc_tx_rdy(struct uart_port *port)
804{
805 return in_be32(&FIFO_5125(port)->txsr) &
806 in_be32(&FIFO_5125(port)->tximr) & MPC512x_PSC_FIFO_ALARM;
807}
808
809static int mpc5125_psc_tx_empty(struct uart_port *port)
810{
811 return in_be32(&FIFO_5125(port)->txsr) & MPC512x_PSC_FIFO_EMPTY;
812}
813
814static void mpc5125_psc_stop_rx(struct uart_port *port)
815{
816 unsigned long rx_fifo_imr;
817
818 rx_fifo_imr = in_be32(&FIFO_5125(port)->rximr);
819 rx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
820 out_be32(&FIFO_5125(port)->rximr, rx_fifo_imr);
821}
822
823static void mpc5125_psc_start_tx(struct uart_port *port)
824{
825 unsigned long tx_fifo_imr;
826
827 tx_fifo_imr = in_be32(&FIFO_5125(port)->tximr);
828 tx_fifo_imr |= MPC512x_PSC_FIFO_ALARM;
829 out_be32(&FIFO_5125(port)->tximr, tx_fifo_imr);
830}
831
832static void mpc5125_psc_stop_tx(struct uart_port *port)
833{
834 unsigned long tx_fifo_imr;
835
836 tx_fifo_imr = in_be32(&FIFO_5125(port)->tximr);
837 tx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
838 out_be32(&FIFO_5125(port)->tximr, tx_fifo_imr);
839}
840
841static void mpc5125_psc_rx_clr_irq(struct uart_port *port)
842{
843 out_be32(&FIFO_5125(port)->rxisr, in_be32(&FIFO_5125(port)->rxisr));
844}
845
846static void mpc5125_psc_tx_clr_irq(struct uart_port *port)
847{
848 out_be32(&FIFO_5125(port)->txisr, in_be32(&FIFO_5125(port)->txisr));
849}
850
851static void mpc5125_psc_write_char(struct uart_port *port, unsigned char c)
852{
853 out_8(&FIFO_5125(port)->txdata_8, c);
854}
855
856static unsigned char mpc5125_psc_read_char(struct uart_port *port)
857{
858 return in_8(&FIFO_5125(port)->rxdata_8);
859}
860
861static void mpc5125_psc_cw_disable_ints(struct uart_port *port)
862{
863 port->read_status_mask =
864 in_be32(&FIFO_5125(port)->tximr) << 16 |
865 in_be32(&FIFO_5125(port)->rximr);
866 out_be32(&FIFO_5125(port)->tximr, 0);
867 out_be32(&FIFO_5125(port)->rximr, 0);
868}
869
870static void mpc5125_psc_cw_restore_ints(struct uart_port *port)
871{
872 out_be32(&FIFO_5125(port)->tximr,
873 (port->read_status_mask >> 16) & 0x7f);
874 out_be32(&FIFO_5125(port)->rximr, port->read_status_mask & 0x7f);
875}
876
877static inline void mpc5125_set_divisor(struct mpc5125_psc __iomem *psc,
878 u8 prescaler, unsigned int divisor)
879{
880 /* select prescaler */
881 out_8(&psc->mpc52xx_psc_clock_select, prescaler);
882 out_8(&psc->ctur, divisor >> 8);
883 out_8(&psc->ctlr, divisor & 0xff);
884}
885
886static unsigned int mpc5125_psc_set_baudrate(struct uart_port *port,
887 struct ktermios *new,
888 struct ktermios *old)
889{
890 unsigned int baud;
891 unsigned int divisor;
892
893 /*
894 * Calculate with a /16 prescaler here.
895 */
896
897 /* uartclk contains the ips freq */
898 baud = uart_get_baud_rate(port, new, old,
899 port->uartclk / (16 * 0xffff) + 1,
900 port->uartclk / 16);
901 divisor = (port->uartclk + 8 * baud) / (16 * baud);
902
903 /* enable the /16 prescaler and set the divisor */
904 mpc5125_set_divisor(PSC_5125(port), 0xdd, divisor);
905 return baud;
906}
907
908/*
909 * MPC5125 have compatible PSC FIFO Controller.
910 * Special init not needed.
911 */
912static u16 mpc5125_psc_get_status(struct uart_port *port)
913{
914 return in_be16(&PSC_5125(port)->mpc52xx_psc_status);
915}
916
917static u8 mpc5125_psc_get_ipcr(struct uart_port *port)
918{
919 return in_8(&PSC_5125(port)->mpc52xx_psc_ipcr);
920}
921
922static void mpc5125_psc_command(struct uart_port *port, u8 cmd)
923{
924 out_8(&PSC_5125(port)->command, cmd);
925}
926
927static void mpc5125_psc_set_mode(struct uart_port *port, u8 mr1, u8 mr2)
928{
929 out_8(&PSC_5125(port)->mr1, mr1);
930 out_8(&PSC_5125(port)->mr2, mr2);
931}
932
933static void mpc5125_psc_set_rts(struct uart_port *port, int state)
934{
935 if (state & TIOCM_RTS)
936 out_8(&PSC_5125(port)->op1, MPC52xx_PSC_OP_RTS);
937 else
938 out_8(&PSC_5125(port)->op0, MPC52xx_PSC_OP_RTS);
939}
940
941static void mpc5125_psc_enable_ms(struct uart_port *port)
942{
943 struct mpc5125_psc __iomem *psc = PSC_5125(port);
944
945 /* clear D_*-bits by reading them */
946 in_8(&psc->mpc52xx_psc_ipcr);
947 /* enable CTS and DCD as IPC interrupts */
948 out_8(&psc->mpc52xx_psc_acr, MPC52xx_PSC_IEC_CTS | MPC52xx_PSC_IEC_DCD);
949
950 port->read_status_mask |= MPC52xx_PSC_IMR_IPC;
951 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
952}
953
954static void mpc5125_psc_set_sicr(struct uart_port *port, u32 val)
955{
956 out_be32(&PSC_5125(port)->sicr, val);
957}
958
959static void mpc5125_psc_set_imr(struct uart_port *port, u16 val)
960{
961 out_be16(&PSC_5125(port)->mpc52xx_psc_imr, val);
962}
963
964static u8 mpc5125_psc_get_mr1(struct uart_port *port)
965{
966 return in_8(&PSC_5125(port)->mr1);
967}
968
969static const struct psc_ops mpc5125_psc_ops = {
970 .fifo_init = mpc5125_psc_fifo_init,
971 .raw_rx_rdy = mpc5125_psc_raw_rx_rdy,
972 .raw_tx_rdy = mpc5125_psc_raw_tx_rdy,
973 .rx_rdy = mpc5125_psc_rx_rdy,
974 .tx_rdy = mpc5125_psc_tx_rdy,
975 .tx_empty = mpc5125_psc_tx_empty,
976 .stop_rx = mpc5125_psc_stop_rx,
977 .start_tx = mpc5125_psc_start_tx,
978 .stop_tx = mpc5125_psc_stop_tx,
979 .rx_clr_irq = mpc5125_psc_rx_clr_irq,
980 .tx_clr_irq = mpc5125_psc_tx_clr_irq,
981 .write_char = mpc5125_psc_write_char,
982 .read_char = mpc5125_psc_read_char,
983 .cw_disable_ints = mpc5125_psc_cw_disable_ints,
984 .cw_restore_ints = mpc5125_psc_cw_restore_ints,
985 .set_baudrate = mpc5125_psc_set_baudrate,
986 .clock_alloc = mpc512x_psc_alloc_clock,
987 .clock_relse = mpc512x_psc_relse_clock,
988 .clock = mpc512x_psc_endis_clock,
989 .fifoc_init = mpc512x_psc_fifoc_init,
990 .fifoc_uninit = mpc512x_psc_fifoc_uninit,
991 .get_irq = mpc512x_psc_get_irq,
992 .handle_irq = mpc512x_psc_handle_irq,
993 .get_status = mpc5125_psc_get_status,
994 .get_ipcr = mpc5125_psc_get_ipcr,
995 .command = mpc5125_psc_command,
996 .set_mode = mpc5125_psc_set_mode,
997 .set_rts = mpc5125_psc_set_rts,
998 .enable_ms = mpc5125_psc_enable_ms,
999 .set_sicr = mpc5125_psc_set_sicr,
1000 .set_imr = mpc5125_psc_set_imr,
1001 .get_mr1 = mpc5125_psc_get_mr1,
1002};
1003
1004static const struct psc_ops mpc512x_psc_ops = {
1005 .fifo_init = mpc512x_psc_fifo_init,
1006 .raw_rx_rdy = mpc512x_psc_raw_rx_rdy,
1007 .raw_tx_rdy = mpc512x_psc_raw_tx_rdy,
1008 .rx_rdy = mpc512x_psc_rx_rdy,
1009 .tx_rdy = mpc512x_psc_tx_rdy,
1010 .tx_empty = mpc512x_psc_tx_empty,
1011 .stop_rx = mpc512x_psc_stop_rx,
1012 .start_tx = mpc512x_psc_start_tx,
1013 .stop_tx = mpc512x_psc_stop_tx,
1014 .rx_clr_irq = mpc512x_psc_rx_clr_irq,
1015 .tx_clr_irq = mpc512x_psc_tx_clr_irq,
1016 .write_char = mpc512x_psc_write_char,
1017 .read_char = mpc512x_psc_read_char,
1018 .cw_disable_ints = mpc512x_psc_cw_disable_ints,
1019 .cw_restore_ints = mpc512x_psc_cw_restore_ints,
1020 .set_baudrate = mpc512x_psc_set_baudrate,
1021 .clock_alloc = mpc512x_psc_alloc_clock,
1022 .clock_relse = mpc512x_psc_relse_clock,
1023 .clock = mpc512x_psc_endis_clock,
1024 .fifoc_init = mpc512x_psc_fifoc_init,
1025 .fifoc_uninit = mpc512x_psc_fifoc_uninit,
1026 .get_irq = mpc512x_psc_get_irq,
1027 .handle_irq = mpc512x_psc_handle_irq,
1028 .get_status = mpc52xx_psc_get_status,
1029 .get_ipcr = mpc52xx_psc_get_ipcr,
1030 .command = mpc52xx_psc_command,
1031 .set_mode = mpc52xx_psc_set_mode,
1032 .set_rts = mpc52xx_psc_set_rts,
1033 .enable_ms = mpc52xx_psc_enable_ms,
1034 .set_sicr = mpc52xx_psc_set_sicr,
1035 .set_imr = mpc52xx_psc_set_imr,
1036 .get_mr1 = mpc52xx_psc_get_mr1,
1037};
1038#endif /* CONFIG_PPC_MPC512x */
1039
1040
1041static const struct psc_ops *psc_ops;
1042
1043/* ======================================================================== */
1044/* UART operations */
1045/* ======================================================================== */
1046
1047static unsigned int
1048mpc52xx_uart_tx_empty(struct uart_port *port)
1049{
1050 return psc_ops->tx_empty(port) ? TIOCSER_TEMT : 0;
1051}
1052
1053static void
1054mpc52xx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
1055{
1056 psc_ops->set_rts(port, mctrl & TIOCM_RTS);
1057}
1058
1059static unsigned int
1060mpc52xx_uart_get_mctrl(struct uart_port *port)
1061{
1062 unsigned int ret = TIOCM_DSR;
1063 u8 status = psc_ops->get_ipcr(port);
1064
1065 if (!(status & MPC52xx_PSC_CTS))
1066 ret |= TIOCM_CTS;
1067 if (!(status & MPC52xx_PSC_DCD))
1068 ret |= TIOCM_CAR;
1069
1070 return ret;
1071}
1072
1073static void
1074mpc52xx_uart_stop_tx(struct uart_port *port)
1075{
1076 /* port->lock taken by caller */
1077 psc_ops->stop_tx(port);
1078}
1079
1080static void
1081mpc52xx_uart_start_tx(struct uart_port *port)
1082{
1083 /* port->lock taken by caller */
1084 psc_ops->start_tx(port);
1085}
1086
1087static void
1088mpc52xx_uart_stop_rx(struct uart_port *port)
1089{
1090 /* port->lock taken by caller */
1091 psc_ops->stop_rx(port);
1092}
1093
1094static void
1095mpc52xx_uart_enable_ms(struct uart_port *port)
1096{
1097 psc_ops->enable_ms(port);
1098}
1099
1100static void
1101mpc52xx_uart_break_ctl(struct uart_port *port, int ctl)
1102{
1103 unsigned long flags;
1104 spin_lock_irqsave(&port->lock, flags);
1105
1106 if (ctl == -1)
1107 psc_ops->command(port, MPC52xx_PSC_START_BRK);
1108 else
1109 psc_ops->command(port, MPC52xx_PSC_STOP_BRK);
1110
1111 spin_unlock_irqrestore(&port->lock, flags);
1112}
1113
1114static int
1115mpc52xx_uart_startup(struct uart_port *port)
1116{
1117 int ret;
1118
1119 if (psc_ops->clock) {
1120 ret = psc_ops->clock(port, 1);
1121 if (ret)
1122 return ret;
1123 }
1124
1125 /* Request IRQ */
1126 ret = request_irq(port->irq, mpc52xx_uart_int,
1127 port->irqflags, "mpc52xx_psc_uart", port);
1128 if (ret)
1129 return ret;
1130
1131 /* Reset/activate the port, clear and enable interrupts */
1132 psc_ops->command(port, MPC52xx_PSC_RST_RX);
1133 psc_ops->command(port, MPC52xx_PSC_RST_TX);
1134
1135 /*
1136 * According to Freescale's support the RST_TX command can produce a
1137 * spike on the TX pin. So they recommend to delay "for one character".
1138 * One millisecond should be enough for everyone.
1139 */
1140 msleep(1);
1141
1142 psc_ops->set_sicr(port, 0); /* UART mode DCD ignored */
1143
1144 psc_ops->fifo_init(port);
1145
1146 psc_ops->command(port, MPC52xx_PSC_TX_ENABLE);
1147 psc_ops->command(port, MPC52xx_PSC_RX_ENABLE);
1148
1149 return 0;
1150}
1151
1152static void
1153mpc52xx_uart_shutdown(struct uart_port *port)
1154{
1155 /* Shut down the port. Leave TX active if on a console port */
1156 psc_ops->command(port, MPC52xx_PSC_RST_RX);
1157 if (!uart_console(port))
1158 psc_ops->command(port, MPC52xx_PSC_RST_TX);
1159
1160 port->read_status_mask = 0;
1161 psc_ops->set_imr(port, port->read_status_mask);
1162
1163 if (psc_ops->clock)
1164 psc_ops->clock(port, 0);
1165
1166 /* Disable interrupt */
1167 psc_ops->cw_disable_ints(port);
1168
1169 /* Release interrupt */
1170 free_irq(port->irq, port);
1171}
1172
1173static void
1174mpc52xx_uart_set_termios(struct uart_port *port, struct ktermios *new,
1175 struct ktermios *old)
1176{
1177 unsigned long flags;
1178 unsigned char mr1, mr2;
1179 unsigned int j;
1180 unsigned int baud;
1181
1182 /* Prepare what we're gonna write */
1183 mr1 = 0;
1184
1185 switch (new->c_cflag & CSIZE) {
1186 case CS5: mr1 |= MPC52xx_PSC_MODE_5_BITS;
1187 break;
1188 case CS6: mr1 |= MPC52xx_PSC_MODE_6_BITS;
1189 break;
1190 case CS7: mr1 |= MPC52xx_PSC_MODE_7_BITS;
1191 break;
1192 case CS8:
1193 default: mr1 |= MPC52xx_PSC_MODE_8_BITS;
1194 }
1195
1196 if (new->c_cflag & PARENB) {
1197 if (new->c_cflag & CMSPAR)
1198 mr1 |= MPC52xx_PSC_MODE_PARFORCE;
1199
1200 /* With CMSPAR, PARODD also means high parity (same as termios) */
1201 mr1 |= (new->c_cflag & PARODD) ?
1202 MPC52xx_PSC_MODE_PARODD : MPC52xx_PSC_MODE_PAREVEN;
1203 } else {
1204 mr1 |= MPC52xx_PSC_MODE_PARNONE;
1205 }
1206
1207 mr2 = 0;
1208
1209 if (new->c_cflag & CSTOPB)
1210 mr2 |= MPC52xx_PSC_MODE_TWO_STOP;
1211 else
1212 mr2 |= ((new->c_cflag & CSIZE) == CS5) ?
1213 MPC52xx_PSC_MODE_ONE_STOP_5_BITS :
1214 MPC52xx_PSC_MODE_ONE_STOP;
1215
1216 if (new->c_cflag & CRTSCTS) {
1217 mr1 |= MPC52xx_PSC_MODE_RXRTS;
1218 mr2 |= MPC52xx_PSC_MODE_TXCTS;
1219 }
1220
1221 /* Get the lock */
1222 spin_lock_irqsave(&port->lock, flags);
1223
1224 /* Do our best to flush TX & RX, so we don't lose anything */
1225 /* But we don't wait indefinitely ! */
1226 j = 5000000; /* Maximum wait */
1227 /* FIXME Can't receive chars since set_termios might be called at early
1228 * boot for the console, all stuff is not yet ready to receive at that
1229 * time and that just makes the kernel oops */
1230 /* while (j-- && mpc52xx_uart_int_rx_chars(port)); */
1231 while (!mpc52xx_uart_tx_empty(port) && --j)
1232 udelay(1);
1233
1234 if (!j)
1235 printk(KERN_ERR "mpc52xx_uart.c: "
1236 "Unable to flush RX & TX fifos in-time in set_termios."
1237 "Some chars may have been lost.\n");
1238
1239 /* Reset the TX & RX */
1240 psc_ops->command(port, MPC52xx_PSC_RST_RX);
1241 psc_ops->command(port, MPC52xx_PSC_RST_TX);
1242
1243 /* Send new mode settings */
1244 psc_ops->set_mode(port, mr1, mr2);
1245 baud = psc_ops->set_baudrate(port, new, old);
1246
1247 /* Update the per-port timeout */
1248 uart_update_timeout(port, new->c_cflag, baud);
1249
1250 if (UART_ENABLE_MS(port, new->c_cflag))
1251 mpc52xx_uart_enable_ms(port);
1252
1253 /* Reenable TX & RX */
1254 psc_ops->command(port, MPC52xx_PSC_TX_ENABLE);
1255 psc_ops->command(port, MPC52xx_PSC_RX_ENABLE);
1256
1257 /* We're all set, release the lock */
1258 spin_unlock_irqrestore(&port->lock, flags);
1259}
1260
1261static const char *
1262mpc52xx_uart_type(struct uart_port *port)
1263{
1264 /*
1265 * We keep using PORT_MPC52xx for historic reasons although it applies
1266 * for MPC512x, too, but print "MPC5xxx" to not irritate users
1267 */
1268 return port->type == PORT_MPC52xx ? "MPC5xxx PSC" : NULL;
1269}
1270
1271static void
1272mpc52xx_uart_release_port(struct uart_port *port)
1273{
1274 if (psc_ops->clock_relse)
1275 psc_ops->clock_relse(port);
1276
1277 /* remapped by us ? */
1278 if (port->flags & UPF_IOREMAP) {
1279 iounmap(port->membase);
1280 port->membase = NULL;
1281 }
1282
1283 release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc));
1284}
1285
1286static int
1287mpc52xx_uart_request_port(struct uart_port *port)
1288{
1289 int err;
1290
1291 if (port->flags & UPF_IOREMAP) /* Need to remap ? */
1292 port->membase = ioremap(port->mapbase,
1293 sizeof(struct mpc52xx_psc));
1294
1295 if (!port->membase)
1296 return -EINVAL;
1297
1298 err = request_mem_region(port->mapbase, sizeof(struct mpc52xx_psc),
1299 "mpc52xx_psc_uart") != NULL ? 0 : -EBUSY;
1300
1301 if (err)
1302 goto out_membase;
1303
1304 if (psc_ops->clock_alloc) {
1305 err = psc_ops->clock_alloc(port);
1306 if (err)
1307 goto out_mapregion;
1308 }
1309
1310 return 0;
1311
1312out_mapregion:
1313 release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc));
1314out_membase:
1315 if (port->flags & UPF_IOREMAP) {
1316 iounmap(port->membase);
1317 port->membase = NULL;
1318 }
1319 return err;
1320}
1321
1322static void
1323mpc52xx_uart_config_port(struct uart_port *port, int flags)
1324{
1325 if ((flags & UART_CONFIG_TYPE)
1326 && (mpc52xx_uart_request_port(port) == 0))
1327 port->type = PORT_MPC52xx;
1328}
1329
1330static int
1331mpc52xx_uart_verify_port(struct uart_port *port, struct serial_struct *ser)
1332{
1333 if (ser->type != PORT_UNKNOWN && ser->type != PORT_MPC52xx)
1334 return -EINVAL;
1335
1336 if ((ser->irq != port->irq) ||
1337 (ser->io_type != UPIO_MEM) ||
1338 (ser->baud_base != port->uartclk) ||
1339 (ser->iomem_base != (void *)port->mapbase) ||
1340 (ser->hub6 != 0))
1341 return -EINVAL;
1342
1343 return 0;
1344}
1345
1346
1347static const struct uart_ops mpc52xx_uart_ops = {
1348 .tx_empty = mpc52xx_uart_tx_empty,
1349 .set_mctrl = mpc52xx_uart_set_mctrl,
1350 .get_mctrl = mpc52xx_uart_get_mctrl,
1351 .stop_tx = mpc52xx_uart_stop_tx,
1352 .start_tx = mpc52xx_uart_start_tx,
1353 .stop_rx = mpc52xx_uart_stop_rx,
1354 .enable_ms = mpc52xx_uart_enable_ms,
1355 .break_ctl = mpc52xx_uart_break_ctl,
1356 .startup = mpc52xx_uart_startup,
1357 .shutdown = mpc52xx_uart_shutdown,
1358 .set_termios = mpc52xx_uart_set_termios,
1359/* .pm = mpc52xx_uart_pm, Not supported yet */
1360 .type = mpc52xx_uart_type,
1361 .release_port = mpc52xx_uart_release_port,
1362 .request_port = mpc52xx_uart_request_port,
1363 .config_port = mpc52xx_uart_config_port,
1364 .verify_port = mpc52xx_uart_verify_port
1365};
1366
1367
1368/* ======================================================================== */
1369/* Interrupt handling */
1370/* ======================================================================== */
1371
1372static inline int
1373mpc52xx_uart_int_rx_chars(struct uart_port *port)
1374{
1375 struct tty_port *tport = &port->state->port;
1376 unsigned char ch, flag;
1377 unsigned short status;
1378
1379 /* While we can read, do so ! */
1380 while (psc_ops->raw_rx_rdy(port)) {
1381 /* Get the char */
1382 ch = psc_ops->read_char(port);
1383
1384 /* Handle sysreq char */
1385#ifdef SUPPORT_SYSRQ
1386 if (uart_handle_sysrq_char(port, ch)) {
1387 port->sysrq = 0;
1388 continue;
1389 }
1390#endif
1391
1392 /* Store it */
1393
1394 flag = TTY_NORMAL;
1395 port->icount.rx++;
1396
1397 status = psc_ops->get_status(port);
1398
1399 if (status & (MPC52xx_PSC_SR_PE |
1400 MPC52xx_PSC_SR_FE |
1401 MPC52xx_PSC_SR_RB)) {
1402
1403 if (status & MPC52xx_PSC_SR_RB) {
1404 flag = TTY_BREAK;
1405 uart_handle_break(port);
1406 port->icount.brk++;
1407 } else if (status & MPC52xx_PSC_SR_PE) {
1408 flag = TTY_PARITY;
1409 port->icount.parity++;
1410 }
1411 else if (status & MPC52xx_PSC_SR_FE) {
1412 flag = TTY_FRAME;
1413 port->icount.frame++;
1414 }
1415
1416 /* Clear error condition */
1417 psc_ops->command(port, MPC52xx_PSC_RST_ERR_STAT);
1418
1419 }
1420 tty_insert_flip_char(tport, ch, flag);
1421 if (status & MPC52xx_PSC_SR_OE) {
1422 /*
1423 * Overrun is special, since it's
1424 * reported immediately, and doesn't
1425 * affect the current character
1426 */
1427 tty_insert_flip_char(tport, 0, TTY_OVERRUN);
1428 port->icount.overrun++;
1429 }
1430 }
1431
1432 spin_unlock(&port->lock);
1433 tty_flip_buffer_push(tport);
1434 spin_lock(&port->lock);
1435
1436 return psc_ops->raw_rx_rdy(port);
1437}
1438
1439static inline int
1440mpc52xx_uart_int_tx_chars(struct uart_port *port)
1441{
1442 struct circ_buf *xmit = &port->state->xmit;
1443
1444 /* Process out of band chars */
1445 if (port->x_char) {
1446 psc_ops->write_char(port, port->x_char);
1447 port->icount.tx++;
1448 port->x_char = 0;
1449 return 1;
1450 }
1451
1452 /* Nothing to do ? */
1453 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
1454 mpc52xx_uart_stop_tx(port);
1455 return 0;
1456 }
1457
1458 /* Send chars */
1459 while (psc_ops->raw_tx_rdy(port)) {
1460 psc_ops->write_char(port, xmit->buf[xmit->tail]);
1461 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
1462 port->icount.tx++;
1463 if (uart_circ_empty(xmit))
1464 break;
1465 }
1466
1467 /* Wake up */
1468 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
1469 uart_write_wakeup(port);
1470
1471 /* Maybe we're done after all */
1472 if (uart_circ_empty(xmit)) {
1473 mpc52xx_uart_stop_tx(port);
1474 return 0;
1475 }
1476
1477 return 1;
1478}
1479
1480static irqreturn_t
1481mpc5xxx_uart_process_int(struct uart_port *port)
1482{
1483 unsigned long pass = ISR_PASS_LIMIT;
1484 unsigned int keepgoing;
1485 u8 status;
1486
1487 /* While we have stuff to do, we continue */
1488 do {
1489 /* If we don't find anything to do, we stop */
1490 keepgoing = 0;
1491
1492 psc_ops->rx_clr_irq(port);
1493 if (psc_ops->rx_rdy(port))
1494 keepgoing |= mpc52xx_uart_int_rx_chars(port);
1495
1496 psc_ops->tx_clr_irq(port);
1497 if (psc_ops->tx_rdy(port))
1498 keepgoing |= mpc52xx_uart_int_tx_chars(port);
1499
1500 status = psc_ops->get_ipcr(port);
1501 if (status & MPC52xx_PSC_D_DCD)
1502 uart_handle_dcd_change(port, !(status & MPC52xx_PSC_DCD));
1503
1504 if (status & MPC52xx_PSC_D_CTS)
1505 uart_handle_cts_change(port, !(status & MPC52xx_PSC_CTS));
1506
1507 /* Limit number of iteration */
1508 if (!(--pass))
1509 keepgoing = 0;
1510
1511 } while (keepgoing);
1512
1513 return IRQ_HANDLED;
1514}
1515
1516static irqreturn_t
1517mpc52xx_uart_int(int irq, void *dev_id)
1518{
1519 struct uart_port *port = dev_id;
1520 irqreturn_t ret;
1521
1522 spin_lock(&port->lock);
1523
1524 ret = psc_ops->handle_irq(port);
1525
1526 spin_unlock(&port->lock);
1527
1528 return ret;
1529}
1530
1531/* ======================================================================== */
1532/* Console ( if applicable ) */
1533/* ======================================================================== */
1534
1535#ifdef CONFIG_SERIAL_MPC52xx_CONSOLE
1536
1537static void __init
1538mpc52xx_console_get_options(struct uart_port *port,
1539 int *baud, int *parity, int *bits, int *flow)
1540{
1541 unsigned char mr1;
1542
1543 pr_debug("mpc52xx_console_get_options(port=%p)\n", port);
1544
1545 /* Read the mode registers */
1546 mr1 = psc_ops->get_mr1(port);
1547
1548 /* CT{U,L}R are write-only ! */
1549 *baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
1550
1551 /* Parse them */
1552 switch (mr1 & MPC52xx_PSC_MODE_BITS_MASK) {
1553 case MPC52xx_PSC_MODE_5_BITS:
1554 *bits = 5;
1555 break;
1556 case MPC52xx_PSC_MODE_6_BITS:
1557 *bits = 6;
1558 break;
1559 case MPC52xx_PSC_MODE_7_BITS:
1560 *bits = 7;
1561 break;
1562 case MPC52xx_PSC_MODE_8_BITS:
1563 default:
1564 *bits = 8;
1565 }
1566
1567 if (mr1 & MPC52xx_PSC_MODE_PARNONE)
1568 *parity = 'n';
1569 else
1570 *parity = mr1 & MPC52xx_PSC_MODE_PARODD ? 'o' : 'e';
1571}
1572
1573static void
1574mpc52xx_console_write(struct console *co, const char *s, unsigned int count)
1575{
1576 struct uart_port *port = &mpc52xx_uart_ports[co->index];
1577 unsigned int i, j;
1578
1579 /* Disable interrupts */
1580 psc_ops->cw_disable_ints(port);
1581
1582 /* Wait the TX buffer to be empty */
1583 j = 5000000; /* Maximum wait */
1584 while (!mpc52xx_uart_tx_empty(port) && --j)
1585 udelay(1);
1586
1587 /* Write all the chars */
1588 for (i = 0; i < count; i++, s++) {
1589 /* Line return handling */
1590 if (*s == '\n')
1591 psc_ops->write_char(port, '\r');
1592
1593 /* Send the char */
1594 psc_ops->write_char(port, *s);
1595
1596 /* Wait the TX buffer to be empty */
1597 j = 20000; /* Maximum wait */
1598 while (!mpc52xx_uart_tx_empty(port) && --j)
1599 udelay(1);
1600 }
1601
1602 /* Restore interrupt state */
1603 psc_ops->cw_restore_ints(port);
1604}
1605
1606
1607static int __init
1608mpc52xx_console_setup(struct console *co, char *options)
1609{
1610 struct uart_port *port = &mpc52xx_uart_ports[co->index];
1611 struct device_node *np = mpc52xx_uart_nodes[co->index];
1612 unsigned int uartclk;
1613 struct resource res;
1614 int ret;
1615
1616 int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
1617 int bits = 8;
1618 int parity = 'n';
1619 int flow = 'n';
1620
1621 pr_debug("mpc52xx_console_setup co=%p, co->index=%i, options=%s\n",
1622 co, co->index, options);
1623
1624 if ((co->index < 0) || (co->index >= MPC52xx_PSC_MAXNUM)) {
1625 pr_debug("PSC%x out of range\n", co->index);
1626 return -EINVAL;
1627 }
1628
1629 if (!np) {
1630 pr_debug("PSC%x not found in device tree\n", co->index);
1631 return -EINVAL;
1632 }
1633
1634 pr_debug("Console on ttyPSC%x is %pOF\n",
1635 co->index, mpc52xx_uart_nodes[co->index]);
1636
1637 /* Fetch register locations */
1638 ret = of_address_to_resource(np, 0, &res);
1639 if (ret) {
1640 pr_debug("Could not get resources for PSC%x\n", co->index);
1641 return ret;
1642 }
1643
1644 uartclk = mpc5xxx_get_bus_frequency(np);
1645 if (uartclk == 0) {
1646 pr_debug("Could not find uart clock frequency!\n");
1647 return -EINVAL;
1648 }
1649
1650 /* Basic port init. Needed since we use some uart_??? func before
1651 * real init for early access */
1652 spin_lock_init(&port->lock);
1653 port->uartclk = uartclk;
1654 port->ops = &mpc52xx_uart_ops;
1655 port->mapbase = res.start;
1656 port->membase = ioremap(res.start, sizeof(struct mpc52xx_psc));
1657 port->irq = irq_of_parse_and_map(np, 0);
1658
1659 if (port->membase == NULL)
1660 return -EINVAL;
1661
1662 pr_debug("mpc52xx-psc uart at %p, mapped to %p, irq=%x, freq=%i\n",
1663 (void *)port->mapbase, port->membase,
1664 port->irq, port->uartclk);
1665
1666 /* Setup the port parameters accoding to options */
1667 if (options)
1668 uart_parse_options(options, &baud, &parity, &bits, &flow);
1669 else
1670 mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow);
1671
1672 pr_debug("Setting console parameters: %i %i%c1 flow=%c\n",
1673 baud, bits, parity, flow);
1674
1675 return uart_set_options(port, co, baud, parity, bits, flow);
1676}
1677
1678
1679static struct uart_driver mpc52xx_uart_driver;
1680
1681static struct console mpc52xx_console = {
1682 .name = "ttyPSC",
1683 .write = mpc52xx_console_write,
1684 .device = uart_console_device,
1685 .setup = mpc52xx_console_setup,
1686 .flags = CON_PRINTBUFFER,
1687 .index = -1, /* Specified on the cmdline (e.g. console=ttyPSC0) */
1688 .data = &mpc52xx_uart_driver,
1689};
1690
1691
1692static int __init
1693mpc52xx_console_init(void)
1694{
1695 mpc52xx_uart_of_enumerate();
1696 register_console(&mpc52xx_console);
1697 return 0;
1698}
1699
1700console_initcall(mpc52xx_console_init);
1701
1702#define MPC52xx_PSC_CONSOLE &mpc52xx_console
1703#else
1704#define MPC52xx_PSC_CONSOLE NULL
1705#endif
1706
1707
1708/* ======================================================================== */
1709/* UART Driver */
1710/* ======================================================================== */
1711
1712static struct uart_driver mpc52xx_uart_driver = {
1713 .driver_name = "mpc52xx_psc_uart",
1714 .dev_name = "ttyPSC",
1715 .major = SERIAL_PSC_MAJOR,
1716 .minor = SERIAL_PSC_MINOR,
1717 .nr = MPC52xx_PSC_MAXNUM,
1718 .cons = MPC52xx_PSC_CONSOLE,
1719};
1720
1721/* ======================================================================== */
1722/* OF Platform Driver */
1723/* ======================================================================== */
1724
1725static const struct of_device_id mpc52xx_uart_of_match[] = {
1726#ifdef CONFIG_PPC_MPC52xx
1727 { .compatible = "fsl,mpc5200b-psc-uart", .data = &mpc5200b_psc_ops, },
1728 { .compatible = "fsl,mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
1729 /* binding used by old lite5200 device trees: */
1730 { .compatible = "mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
1731 /* binding used by efika: */
1732 { .compatible = "mpc5200-serial", .data = &mpc52xx_psc_ops, },
1733#endif
1734#ifdef CONFIG_PPC_MPC512x
1735 { .compatible = "fsl,mpc5121-psc-uart", .data = &mpc512x_psc_ops, },
1736 { .compatible = "fsl,mpc5125-psc-uart", .data = &mpc5125_psc_ops, },
1737#endif
1738 {},
1739};
1740
1741static int mpc52xx_uart_of_probe(struct platform_device *op)
1742{
1743 int idx = -1;
1744 unsigned int uartclk;
1745 struct uart_port *port = NULL;
1746 struct resource res;
1747 int ret;
1748
1749 /* Check validity & presence */
1750 for (idx = 0; idx < MPC52xx_PSC_MAXNUM; idx++)
1751 if (mpc52xx_uart_nodes[idx] == op->dev.of_node)
1752 break;
1753 if (idx >= MPC52xx_PSC_MAXNUM)
1754 return -EINVAL;
1755 pr_debug("Found %pOF assigned to ttyPSC%x\n",
1756 mpc52xx_uart_nodes[idx], idx);
1757
1758 /* set the uart clock to the input clock of the psc, the different
1759 * prescalers are taken into account in the set_baudrate() methods
1760 * of the respective chip */
1761 uartclk = mpc5xxx_get_bus_frequency(op->dev.of_node);
1762 if (uartclk == 0) {
1763 dev_dbg(&op->dev, "Could not find uart clock frequency!\n");
1764 return -EINVAL;
1765 }
1766
1767 /* Init the port structure */
1768 port = &mpc52xx_uart_ports[idx];
1769
1770 spin_lock_init(&port->lock);
1771 port->uartclk = uartclk;
1772 port->fifosize = 512;
1773 port->iotype = UPIO_MEM;
1774 port->flags = UPF_BOOT_AUTOCONF |
1775 (uart_console(port) ? 0 : UPF_IOREMAP);
1776 port->line = idx;
1777 port->ops = &mpc52xx_uart_ops;
1778 port->dev = &op->dev;
1779
1780 /* Search for IRQ and mapbase */
1781 ret = of_address_to_resource(op->dev.of_node, 0, &res);
1782 if (ret)
1783 return ret;
1784
1785 port->mapbase = res.start;
1786 if (!port->mapbase) {
1787 dev_dbg(&op->dev, "Could not allocate resources for PSC\n");
1788 return -EINVAL;
1789 }
1790
1791 psc_ops->get_irq(port, op->dev.of_node);
1792 if (port->irq == 0) {
1793 dev_dbg(&op->dev, "Could not get irq\n");
1794 return -EINVAL;
1795 }
1796
1797 dev_dbg(&op->dev, "mpc52xx-psc uart at %p, irq=%x, freq=%i\n",
1798 (void *)port->mapbase, port->irq, port->uartclk);
1799
1800 /* Add the port to the uart sub-system */
1801 ret = uart_add_one_port(&mpc52xx_uart_driver, port);
1802 if (ret)
1803 return ret;
1804
1805 platform_set_drvdata(op, (void *)port);
1806 return 0;
1807}
1808
1809static int
1810mpc52xx_uart_of_remove(struct platform_device *op)
1811{
1812 struct uart_port *port = platform_get_drvdata(op);
1813
1814 if (port)
1815 uart_remove_one_port(&mpc52xx_uart_driver, port);
1816
1817 return 0;
1818}
1819
1820#ifdef CONFIG_PM
1821static int
1822mpc52xx_uart_of_suspend(struct platform_device *op, pm_message_t state)
1823{
1824 struct uart_port *port = platform_get_drvdata(op);
1825
1826 if (port)
1827 uart_suspend_port(&mpc52xx_uart_driver, port);
1828
1829 return 0;
1830}
1831
1832static int
1833mpc52xx_uart_of_resume(struct platform_device *op)
1834{
1835 struct uart_port *port = platform_get_drvdata(op);
1836
1837 if (port)
1838 uart_resume_port(&mpc52xx_uart_driver, port);
1839
1840 return 0;
1841}
1842#endif
1843
1844static void
1845mpc52xx_uart_of_assign(struct device_node *np)
1846{
1847 int i;
1848
1849 /* Find the first free PSC number */
1850 for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
1851 if (mpc52xx_uart_nodes[i] == NULL) {
1852 of_node_get(np);
1853 mpc52xx_uart_nodes[i] = np;
1854 return;
1855 }
1856 }
1857}
1858
1859static void
1860mpc52xx_uart_of_enumerate(void)
1861{
1862 static int enum_done;
1863 struct device_node *np;
1864 const struct of_device_id *match;
1865 int i;
1866
1867 if (enum_done)
1868 return;
1869
1870 /* Assign index to each PSC in device tree */
1871 for_each_matching_node(np, mpc52xx_uart_of_match) {
1872 match = of_match_node(mpc52xx_uart_of_match, np);
1873 psc_ops = match->data;
1874 mpc52xx_uart_of_assign(np);
1875 }
1876
1877 enum_done = 1;
1878
1879 for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
1880 if (mpc52xx_uart_nodes[i])
1881 pr_debug("%pOF assigned to ttyPSC%x\n",
1882 mpc52xx_uart_nodes[i], i);
1883 }
1884}
1885
1886MODULE_DEVICE_TABLE(of, mpc52xx_uart_of_match);
1887
1888static struct platform_driver mpc52xx_uart_of_driver = {
1889 .probe = mpc52xx_uart_of_probe,
1890 .remove = mpc52xx_uart_of_remove,
1891#ifdef CONFIG_PM
1892 .suspend = mpc52xx_uart_of_suspend,
1893 .resume = mpc52xx_uart_of_resume,
1894#endif
1895 .driver = {
1896 .name = "mpc52xx-psc-uart",
1897 .of_match_table = mpc52xx_uart_of_match,
1898 },
1899};
1900
1901
1902/* ======================================================================== */
1903/* Module */
1904/* ======================================================================== */
1905
1906static int __init
1907mpc52xx_uart_init(void)
1908{
1909 int ret;
1910
1911 printk(KERN_INFO "Serial: MPC52xx PSC UART driver\n");
1912
1913 ret = uart_register_driver(&mpc52xx_uart_driver);
1914 if (ret) {
1915 printk(KERN_ERR "%s: uart_register_driver failed (%i)\n",
1916 __FILE__, ret);
1917 return ret;
1918 }
1919
1920 mpc52xx_uart_of_enumerate();
1921
1922 /*
1923 * Map the PSC FIFO Controller and init if on MPC512x.
1924 */
1925 if (psc_ops && psc_ops->fifoc_init) {
1926 ret = psc_ops->fifoc_init();
1927 if (ret)
1928 goto err_init;
1929 }
1930
1931 ret = platform_driver_register(&mpc52xx_uart_of_driver);
1932 if (ret) {
1933 printk(KERN_ERR "%s: platform_driver_register failed (%i)\n",
1934 __FILE__, ret);
1935 goto err_reg;
1936 }
1937
1938 return 0;
1939err_reg:
1940 if (psc_ops && psc_ops->fifoc_uninit)
1941 psc_ops->fifoc_uninit();
1942err_init:
1943 uart_unregister_driver(&mpc52xx_uart_driver);
1944 return ret;
1945}
1946
1947static void __exit
1948mpc52xx_uart_exit(void)
1949{
1950 if (psc_ops->fifoc_uninit)
1951 psc_ops->fifoc_uninit();
1952
1953 platform_driver_unregister(&mpc52xx_uart_of_driver);
1954 uart_unregister_driver(&mpc52xx_uart_driver);
1955}
1956
1957
1958module_init(mpc52xx_uart_init);
1959module_exit(mpc52xx_uart_exit);
1960
1961MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
1962MODULE_DESCRIPTION("Freescale MPC52xx PSC UART");
1963MODULE_LICENSE("GPL");