blob: 1a88b363005c1ceb81cd589b9f0ee8bd4eeb41f5 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * 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>
Grant Likely9b9129e2006-11-27 14:21:01 -070015 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070016 * Some of the code has been inspired/copied from the 2.4 code written
17 * by Dale Farnsworth <dfarnsworth@mvista.com>.
Grant Likely9b9129e2006-11-27 14:21:01 -070018 *
John Rigby25ae3a02008-01-29 04:28:56 +110019 * Copyright (C) 2008 Freescale Semiconductor Inc.
20 * John Rigby <jrigby@gmail.com>
21 * Added support for MPC5121
Grant Likelyb9272df2006-11-27 14:21:02 -070022 * Copyright (C) 2006 Secret Lab Technologies Ltd.
23 * Grant Likely <grant.likely@secretlab.ca>
24 * Copyright (C) 2004-2006 Sylvain Munaut <tnt@246tNt.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025 * Copyright (C) 2003 MontaVista, Software, Inc.
Grant Likely9b9129e2006-11-27 14:21:01 -070026 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070027 * 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 */
Grant Likely9b9129e2006-11-27 14:21:01 -070031
Grant Likelyb9272df2006-11-27 14:21:02 -070032#undef DEBUG
33
34#include <linux/device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <linux/module.h>
36#include <linux/tty.h>
37#include <linux/serial.h>
38#include <linux/sysrq.h>
39#include <linux/console.h>
John Rigby406b7d42008-01-17 08:37:25 +110040#include <linux/delay.h>
41#include <linux/io.h>
Grant Likely283029d2008-01-09 06:20:40 +110042#include <linux/of.h>
43#include <linux/of_platform.h>
Anatolij Gustschin6acc6832010-02-16 22:30:03 -070044#include <linux/clk.h>
Grant Likelyb9272df2006-11-27 14:21:02 -070045
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#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
Sylvain Munautd62de3a2006-01-06 00:11:32 -080056/* 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
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 */
Kumar Gala8d1fb8c2008-08-01 11:09:34 -050072
Grant Likelyb9272df2006-11-27 14:21:02 -070073/* 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
John Rigby599f0302008-01-29 04:28:55 +110078
Linus Torvalds1da177e2005-04-16 15:20:36 -070079#define PSC(port) ((struct mpc52xx_psc __iomem *)((port)->membase))
80
81
82/* Forward declaration of the interruption handling routine */
John Rigby406b7d42008-01-17 08:37:25 +110083static irqreturn_t mpc52xx_uart_int(int irq, void *dev_id);
Anatolij Gustschin6acc6832010-02-16 22:30:03 -070084static irqreturn_t mpc5xxx_uart_process_int(struct uart_port *port);
Linus Torvalds1da177e2005-04-16 15:20:36 -070085
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
John Rigby406b7d42008-01-17 08:37:25 +110090#define uart_console(port) \
91 ((port)->cons && (port)->cons->index == (port)->line)
Linus Torvalds1da177e2005-04-16 15:20:36 -070092#else
93#define uart_console(port) (0)
94#endif
95
John Rigby599f0302008-01-29 04:28:55 +110096/* ======================================================================== */
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);
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000116 unsigned int (*set_baudrate)(struct uart_port *port,
117 struct ktermios *new,
118 struct ktermios *old);
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700119 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);
John Rigby599f0302008-01-29 04:28:55 +1100124};
125
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000126/* 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
John Rigby25ae3a02008-01-29 04:28:56 +1100136#ifdef CONFIG_PPC_MPC52xx
John Rigby599f0302008-01-29 04:28:55 +1100137#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
John Rigby599f0302008-01-29 04:28:55 +1100143 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
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000231static unsigned int mpc5200_psc_set_baudrate(struct uart_port *port,
232 struct ktermios *new,
233 struct ktermios *old)
John Rigby599f0302008-01-29 04:28:55 +1100234{
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000235 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;
John Rigby599f0302008-01-29 04:28:55 +1100272}
273
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700274static 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
John Rigby599f0302008-01-29 04:28:55 +1100286static 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,
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000302 .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,
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700324 .get_irq = mpc52xx_psc_get_irq,
325 .handle_irq = mpc52xx_psc_handle_irq,
John Rigby599f0302008-01-29 04:28:55 +1100326};
327
John Rigby25ae3a02008-01-29 04:28:56 +1100328#endif /* CONFIG_MPC52xx */
329
330#ifdef CONFIG_PPC_MPC512x
331#define FIFO_512x(port) ((struct mpc512x_psc_fifo __iomem *)(PSC(port)+1))
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700332
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
John Rigby25ae3a02008-01-29 04:28:56 +1100345static void mpc512x_psc_fifo_init(struct uart_port *port)
346{
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700347 /* /32 prescaler */
348 out_be16(&PSC(port)->mpc52xx_psc_clock_select, 0xdd00);
349
John Rigby25ae3a02008-01-29 04:28:56 +1100350 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
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000457static unsigned int mpc512x_psc_set_baudrate(struct uart_port *port,
458 struct ktermios *new,
459 struct ktermios *old)
John Rigby25ae3a02008-01-29 04:28:56 +1100460{
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000461 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;
John Rigby25ae3a02008-01-29 04:28:56 +1100486}
487
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700488/* Init PSC FIFO Controller */
489static int __init mpc512x_psc_fifoc_init(void)
490{
491 struct device_node *np;
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700492
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 return -ENODEV;
504 }
505
506 psc_fifoc_irq = irq_of_parse_and_map(np, 0);
507 of_node_put(np);
508 if (psc_fifoc_irq == NO_IRQ) {
509 pr_err("%s: Can't get FIFOC irq\n", __func__);
510 iounmap(psc_fifoc);
511 return -ENODEV;
512 }
513
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700514 return 0;
515}
516
517static void __exit mpc512x_psc_fifoc_uninit(void)
518{
519 iounmap(psc_fifoc);
520}
521
522/* 512x specific interrupt handler. The caller holds the port lock */
523static irqreturn_t mpc512x_psc_handle_irq(struct uart_port *port)
524{
525 unsigned long fifoc_int;
526 int psc_num;
527
528 /* Read pending PSC FIFOC interrupts */
529 fifoc_int = in_be32(&psc_fifoc->fifoc_int);
530
531 /* Check if it is an interrupt for this port */
532 psc_num = (port->mapbase & 0xf00) >> 8;
533 if (test_bit(psc_num, &fifoc_int) ||
534 test_bit(psc_num + 16, &fifoc_int))
535 return mpc5xxx_uart_process_int(port);
536
537 return IRQ_NONE;
538}
539
540static int mpc512x_psc_clock(struct uart_port *port, int enable)
541{
542 struct clk *psc_clk;
543 int psc_num;
544 char clk_name[10];
545
546 if (uart_console(port))
547 return 0;
548
549 psc_num = (port->mapbase & 0xf00) >> 8;
550 snprintf(clk_name, sizeof(clk_name), "psc%d_clk", psc_num);
551 psc_clk = clk_get(port->dev, clk_name);
552 if (IS_ERR(psc_clk)) {
553 dev_err(port->dev, "Failed to get PSC clock entry!\n");
554 return -ENODEV;
555 }
556
557 dev_dbg(port->dev, "%s %sable\n", clk_name, enable ? "en" : "dis");
558
559 if (enable)
560 clk_enable(psc_clk);
561 else
562 clk_disable(psc_clk);
563
564 return 0;
565}
566
567static void mpc512x_psc_get_irq(struct uart_port *port, struct device_node *np)
568{
569 port->irqflags = IRQF_SHARED;
570 port->irq = psc_fifoc_irq;
571}
572
John Rigby25ae3a02008-01-29 04:28:56 +1100573static struct psc_ops mpc512x_psc_ops = {
574 .fifo_init = mpc512x_psc_fifo_init,
575 .raw_rx_rdy = mpc512x_psc_raw_rx_rdy,
576 .raw_tx_rdy = mpc512x_psc_raw_tx_rdy,
577 .rx_rdy = mpc512x_psc_rx_rdy,
578 .tx_rdy = mpc512x_psc_tx_rdy,
579 .tx_empty = mpc512x_psc_tx_empty,
580 .stop_rx = mpc512x_psc_stop_rx,
581 .start_tx = mpc512x_psc_start_tx,
582 .stop_tx = mpc512x_psc_stop_tx,
583 .rx_clr_irq = mpc512x_psc_rx_clr_irq,
584 .tx_clr_irq = mpc512x_psc_tx_clr_irq,
585 .write_char = mpc512x_psc_write_char,
586 .read_char = mpc512x_psc_read_char,
587 .cw_disable_ints = mpc512x_psc_cw_disable_ints,
588 .cw_restore_ints = mpc512x_psc_cw_restore_ints,
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000589 .set_baudrate = mpc512x_psc_set_baudrate,
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700590 .clock = mpc512x_psc_clock,
591 .fifoc_init = mpc512x_psc_fifoc_init,
592 .fifoc_uninit = mpc512x_psc_fifoc_uninit,
593 .get_irq = mpc512x_psc_get_irq,
594 .handle_irq = mpc512x_psc_handle_irq,
John Rigby25ae3a02008-01-29 04:28:56 +1100595};
596#endif
597
598static struct psc_ops *psc_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599
600/* ======================================================================== */
601/* UART operations */
602/* ======================================================================== */
603
Grant Likely9b9129e2006-11-27 14:21:01 -0700604static unsigned int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605mpc52xx_uart_tx_empty(struct uart_port *port)
606{
John Rigby599f0302008-01-29 04:28:55 +1100607 return psc_ops->tx_empty(port) ? TIOCSER_TEMT : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608}
609
Grant Likely9b9129e2006-11-27 14:21:01 -0700610static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611mpc52xx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
612{
Wolfram Sangaec739e2008-12-21 02:54:32 -0700613 if (mctrl & TIOCM_RTS)
614 out_8(&PSC(port)->op1, MPC52xx_PSC_OP_RTS);
615 else
616 out_8(&PSC(port)->op0, MPC52xx_PSC_OP_RTS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617}
618
Grant Likely9b9129e2006-11-27 14:21:01 -0700619static unsigned int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620mpc52xx_uart_get_mctrl(struct uart_port *port)
621{
Wolfram Sangaec739e2008-12-21 02:54:32 -0700622 unsigned int ret = TIOCM_DSR;
623 u8 status = in_8(&PSC(port)->mpc52xx_psc_ipcr);
624
625 if (!(status & MPC52xx_PSC_CTS))
626 ret |= TIOCM_CTS;
627 if (!(status & MPC52xx_PSC_DCD))
628 ret |= TIOCM_CAR;
629
630 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631}
632
Grant Likely9b9129e2006-11-27 14:21:01 -0700633static void
Russell Kingb129a8c2005-08-31 10:12:14 +0100634mpc52xx_uart_stop_tx(struct uart_port *port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635{
636 /* port->lock taken by caller */
John Rigby599f0302008-01-29 04:28:55 +1100637 psc_ops->stop_tx(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638}
639
Grant Likely9b9129e2006-11-27 14:21:01 -0700640static void
Russell Kingb129a8c2005-08-31 10:12:14 +0100641mpc52xx_uart_start_tx(struct uart_port *port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642{
643 /* port->lock taken by caller */
John Rigby599f0302008-01-29 04:28:55 +1100644 psc_ops->start_tx(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645}
646
Grant Likely9b9129e2006-11-27 14:21:01 -0700647static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648mpc52xx_uart_send_xchar(struct uart_port *port, char ch)
649{
650 unsigned long flags;
651 spin_lock_irqsave(&port->lock, flags);
Grant Likely9b9129e2006-11-27 14:21:01 -0700652
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 port->x_char = ch;
654 if (ch) {
655 /* Make sure tx interrupts are on */
656 /* Truly necessary ??? They should be anyway */
John Rigby599f0302008-01-29 04:28:55 +1100657 psc_ops->start_tx(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 }
Grant Likely9b9129e2006-11-27 14:21:01 -0700659
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 spin_unlock_irqrestore(&port->lock, flags);
661}
662
663static void
664mpc52xx_uart_stop_rx(struct uart_port *port)
665{
666 /* port->lock taken by caller */
John Rigby599f0302008-01-29 04:28:55 +1100667 psc_ops->stop_rx(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668}
669
670static void
671mpc52xx_uart_enable_ms(struct uart_port *port)
672{
Wolfram Sangaec739e2008-12-21 02:54:32 -0700673 struct mpc52xx_psc __iomem *psc = PSC(port);
674
675 /* clear D_*-bits by reading them */
676 in_8(&psc->mpc52xx_psc_ipcr);
677 /* enable CTS and DCD as IPC interrupts */
678 out_8(&psc->mpc52xx_psc_acr, MPC52xx_PSC_IEC_CTS | MPC52xx_PSC_IEC_DCD);
679
680 port->read_status_mask |= MPC52xx_PSC_IMR_IPC;
681 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682}
683
684static void
685mpc52xx_uart_break_ctl(struct uart_port *port, int ctl)
686{
687 unsigned long flags;
688 spin_lock_irqsave(&port->lock, flags);
689
John Rigby406b7d42008-01-17 08:37:25 +1100690 if (ctl == -1)
691 out_8(&PSC(port)->command, MPC52xx_PSC_START_BRK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 else
John Rigby406b7d42008-01-17 08:37:25 +1100693 out_8(&PSC(port)->command, MPC52xx_PSC_STOP_BRK);
Grant Likely9b9129e2006-11-27 14:21:01 -0700694
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 spin_unlock_irqrestore(&port->lock, flags);
696}
697
698static int
699mpc52xx_uart_startup(struct uart_port *port)
700{
701 struct mpc52xx_psc __iomem *psc = PSC(port);
702 int ret;
703
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700704 if (psc_ops->clock) {
705 ret = psc_ops->clock(port, 1);
706 if (ret)
707 return ret;
708 }
709
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 /* Request IRQ */
711 ret = request_irq(port->irq, mpc52xx_uart_int,
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700712 port->irqflags, "mpc52xx_psc_uart", port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 if (ret)
714 return ret;
715
716 /* Reset/activate the port, clear and enable interrupts */
John Rigby406b7d42008-01-17 08:37:25 +1100717 out_8(&psc->command, MPC52xx_PSC_RST_RX);
718 out_8(&psc->command, MPC52xx_PSC_RST_TX);
Grant Likely9b9129e2006-11-27 14:21:01 -0700719
John Rigby406b7d42008-01-17 08:37:25 +1100720 out_be32(&psc->sicr, 0); /* UART mode DCD ignored */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721
John Rigby599f0302008-01-29 04:28:55 +1100722 psc_ops->fifo_init(port);
Grant Likely9b9129e2006-11-27 14:21:01 -0700723
John Rigby406b7d42008-01-17 08:37:25 +1100724 out_8(&psc->command, MPC52xx_PSC_TX_ENABLE);
725 out_8(&psc->command, MPC52xx_PSC_RX_ENABLE);
Grant Likely9b9129e2006-11-27 14:21:01 -0700726
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 return 0;
728}
729
730static void
731mpc52xx_uart_shutdown(struct uart_port *port)
732{
733 struct mpc52xx_psc __iomem *psc = PSC(port);
Grant Likely9b9129e2006-11-27 14:21:01 -0700734
Grant Likelya3481192007-05-07 01:38:51 +1000735 /* Shut down the port. Leave TX active if on a console port */
John Rigby406b7d42008-01-17 08:37:25 +1100736 out_8(&psc->command, MPC52xx_PSC_RST_RX);
Grant Likelya3481192007-05-07 01:38:51 +1000737 if (!uart_console(port))
John Rigby406b7d42008-01-17 08:37:25 +1100738 out_8(&psc->command, MPC52xx_PSC_RST_TX);
Grant Likely9b9129e2006-11-27 14:21:01 -0700739
740 port->read_status_mask = 0;
John Rigby406b7d42008-01-17 08:37:25 +1100741 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700743 if (psc_ops->clock)
744 psc_ops->clock(port, 0);
745
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 /* Release interrupt */
747 free_irq(port->irq, port);
748}
749
Grant Likely9b9129e2006-11-27 14:21:01 -0700750static void
Alan Cox606d0992006-12-08 02:38:45 -0800751mpc52xx_uart_set_termios(struct uart_port *port, struct ktermios *new,
John Rigby406b7d42008-01-17 08:37:25 +1100752 struct ktermios *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753{
754 struct mpc52xx_psc __iomem *psc = PSC(port);
755 unsigned long flags;
756 unsigned char mr1, mr2;
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000757 unsigned int j;
758 unsigned int baud;
Grant Likely9b9129e2006-11-27 14:21:01 -0700759
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 /* Prepare what we're gonna write */
761 mr1 = 0;
Grant Likely9b9129e2006-11-27 14:21:01 -0700762
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 switch (new->c_cflag & CSIZE) {
John Rigby406b7d42008-01-17 08:37:25 +1100764 case CS5: mr1 |= MPC52xx_PSC_MODE_5_BITS;
765 break;
766 case CS6: mr1 |= MPC52xx_PSC_MODE_6_BITS;
767 break;
768 case CS7: mr1 |= MPC52xx_PSC_MODE_7_BITS;
769 break;
770 case CS8:
771 default: mr1 |= MPC52xx_PSC_MODE_8_BITS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 }
773
774 if (new->c_cflag & PARENB) {
775 mr1 |= (new->c_cflag & PARODD) ?
776 MPC52xx_PSC_MODE_PARODD : MPC52xx_PSC_MODE_PAREVEN;
777 } else
778 mr1 |= MPC52xx_PSC_MODE_PARNONE;
Grant Likely9b9129e2006-11-27 14:21:01 -0700779
780
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 mr2 = 0;
782
783 if (new->c_cflag & CSTOPB)
784 mr2 |= MPC52xx_PSC_MODE_TWO_STOP;
785 else
786 mr2 |= ((new->c_cflag & CSIZE) == CS5) ?
787 MPC52xx_PSC_MODE_ONE_STOP_5_BITS :
788 MPC52xx_PSC_MODE_ONE_STOP;
789
Wolfram Sangaec739e2008-12-21 02:54:32 -0700790 if (new->c_cflag & CRTSCTS) {
791 mr1 |= MPC52xx_PSC_MODE_RXRTS;
792 mr2 |= MPC52xx_PSC_MODE_TXCTS;
793 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 /* Get the lock */
796 spin_lock_irqsave(&port->lock, flags);
797
Nick Andrewc4f01242008-12-05 16:34:46 +0000798 /* Do our best to flush TX & RX, so we don't lose anything */
799 /* But we don't wait indefinitely ! */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 j = 5000000; /* Maximum wait */
801 /* FIXME Can't receive chars since set_termios might be called at early
802 * boot for the console, all stuff is not yet ready to receive at that
803 * time and that just makes the kernel oops */
804 /* while (j-- && mpc52xx_uart_int_rx_chars(port)); */
John Rigby599f0302008-01-29 04:28:55 +1100805 while (!mpc52xx_uart_tx_empty(port) && --j)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 udelay(1);
807
808 if (!j)
John Rigby406b7d42008-01-17 08:37:25 +1100809 printk(KERN_ERR "mpc52xx_uart.c: "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 "Unable to flush RX & TX fifos in-time in set_termios."
John Rigby406b7d42008-01-17 08:37:25 +1100811 "Some chars may have been lost.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812
813 /* Reset the TX & RX */
John Rigby406b7d42008-01-17 08:37:25 +1100814 out_8(&psc->command, MPC52xx_PSC_RST_RX);
815 out_8(&psc->command, MPC52xx_PSC_RST_TX);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816
817 /* Send new mode settings */
John Rigby406b7d42008-01-17 08:37:25 +1100818 out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
819 out_8(&psc->mode, mr1);
820 out_8(&psc->mode, mr2);
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000821 baud = psc_ops->set_baudrate(port, new, old);
822
823 /* Update the per-port timeout */
824 uart_update_timeout(port, new->c_cflag, baud);
Grant Likely9b9129e2006-11-27 14:21:01 -0700825
Wolfram Sangaec739e2008-12-21 02:54:32 -0700826 if (UART_ENABLE_MS(port, new->c_cflag))
827 mpc52xx_uart_enable_ms(port);
828
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 /* Reenable TX & RX */
John Rigby406b7d42008-01-17 08:37:25 +1100830 out_8(&psc->command, MPC52xx_PSC_TX_ENABLE);
831 out_8(&psc->command, MPC52xx_PSC_RX_ENABLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832
833 /* We're all set, release the lock */
834 spin_unlock_irqrestore(&port->lock, flags);
835}
836
837static const char *
838mpc52xx_uart_type(struct uart_port *port)
839{
840 return port->type == PORT_MPC52xx ? "MPC52xx PSC" : NULL;
841}
842
843static void
844mpc52xx_uart_release_port(struct uart_port *port)
845{
John Rigby406b7d42008-01-17 08:37:25 +1100846 /* remapped by us ? */
847 if (port->flags & UPF_IOREMAP) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848 iounmap(port->membase);
849 port->membase = NULL;
850 }
851
Grant Likelyb9272df2006-11-27 14:21:02 -0700852 release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853}
854
855static int
856mpc52xx_uart_request_port(struct uart_port *port)
857{
Amol Ladbe618f52006-09-30 23:29:23 -0700858 int err;
859
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 if (port->flags & UPF_IOREMAP) /* Need to remap ? */
Grant Likelyb9272df2006-11-27 14:21:02 -0700861 port->membase = ioremap(port->mapbase,
John Rigby406b7d42008-01-17 08:37:25 +1100862 sizeof(struct mpc52xx_psc));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863
864 if (!port->membase)
865 return -EINVAL;
866
Grant Likelyb9272df2006-11-27 14:21:02 -0700867 err = request_mem_region(port->mapbase, sizeof(struct mpc52xx_psc),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 "mpc52xx_psc_uart") != NULL ? 0 : -EBUSY;
Amol Ladbe618f52006-09-30 23:29:23 -0700869
870 if (err && (port->flags & UPF_IOREMAP)) {
871 iounmap(port->membase);
872 port->membase = NULL;
873 }
874
875 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876}
877
878static void
879mpc52xx_uart_config_port(struct uart_port *port, int flags)
880{
John Rigby406b7d42008-01-17 08:37:25 +1100881 if ((flags & UART_CONFIG_TYPE)
882 && (mpc52xx_uart_request_port(port) == 0))
883 port->type = PORT_MPC52xx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884}
885
886static int
887mpc52xx_uart_verify_port(struct uart_port *port, struct serial_struct *ser)
888{
John Rigby406b7d42008-01-17 08:37:25 +1100889 if (ser->type != PORT_UNKNOWN && ser->type != PORT_MPC52xx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 return -EINVAL;
891
John Rigby406b7d42008-01-17 08:37:25 +1100892 if ((ser->irq != port->irq) ||
Julia Lawallb7a82122009-10-15 09:58:28 -0600893 (ser->io_type != UPIO_MEM) ||
John Rigby406b7d42008-01-17 08:37:25 +1100894 (ser->baud_base != port->uartclk) ||
895 (ser->iomem_base != (void *)port->mapbase) ||
896 (ser->hub6 != 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897 return -EINVAL;
898
899 return 0;
900}
901
902
903static struct uart_ops mpc52xx_uart_ops = {
904 .tx_empty = mpc52xx_uart_tx_empty,
905 .set_mctrl = mpc52xx_uart_set_mctrl,
906 .get_mctrl = mpc52xx_uart_get_mctrl,
907 .stop_tx = mpc52xx_uart_stop_tx,
908 .start_tx = mpc52xx_uart_start_tx,
909 .send_xchar = mpc52xx_uart_send_xchar,
910 .stop_rx = mpc52xx_uart_stop_rx,
911 .enable_ms = mpc52xx_uart_enable_ms,
912 .break_ctl = mpc52xx_uart_break_ctl,
913 .startup = mpc52xx_uart_startup,
914 .shutdown = mpc52xx_uart_shutdown,
915 .set_termios = mpc52xx_uart_set_termios,
916/* .pm = mpc52xx_uart_pm, Not supported yet */
917/* .set_wake = mpc52xx_uart_set_wake, Not supported yet */
918 .type = mpc52xx_uart_type,
919 .release_port = mpc52xx_uart_release_port,
920 .request_port = mpc52xx_uart_request_port,
921 .config_port = mpc52xx_uart_config_port,
922 .verify_port = mpc52xx_uart_verify_port
923};
924
Grant Likely9b9129e2006-11-27 14:21:01 -0700925
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926/* ======================================================================== */
927/* Interrupt handling */
928/* ======================================================================== */
Grant Likely9b9129e2006-11-27 14:21:01 -0700929
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930static inline int
David Howells7d12e782006-10-05 14:55:46 +0100931mpc52xx_uart_int_rx_chars(struct uart_port *port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932{
Alan Coxebd2c8f2009-09-19 13:13:28 -0700933 struct tty_struct *tty = port->state->port.tty;
Alan Cox33f0f882006-01-09 20:54:13 -0800934 unsigned char ch, flag;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 unsigned short status;
936
937 /* While we can read, do so ! */
John Rigby599f0302008-01-29 04:28:55 +1100938 while (psc_ops->raw_rx_rdy(port)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939 /* Get the char */
John Rigby599f0302008-01-29 04:28:55 +1100940 ch = psc_ops->read_char(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941
942 /* Handle sysreq char */
943#ifdef SUPPORT_SYSRQ
David Howells7d12e782006-10-05 14:55:46 +0100944 if (uart_handle_sysrq_char(port, ch)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 port->sysrq = 0;
946 continue;
947 }
948#endif
949
950 /* Store it */
Alan Cox33f0f882006-01-09 20:54:13 -0800951
952 flag = TTY_NORMAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953 port->icount.rx++;
Grant Likely9b9129e2006-11-27 14:21:01 -0700954
John Rigby599f0302008-01-29 04:28:55 +1100955 status = in_be16(&PSC(port)->mpc52xx_psc_status);
956
John Rigby406b7d42008-01-17 08:37:25 +1100957 if (status & (MPC52xx_PSC_SR_PE |
958 MPC52xx_PSC_SR_FE |
959 MPC52xx_PSC_SR_RB)) {
Grant Likely9b9129e2006-11-27 14:21:01 -0700960
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 if (status & MPC52xx_PSC_SR_RB) {
Alan Cox33f0f882006-01-09 20:54:13 -0800962 flag = TTY_BREAK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 uart_handle_break(port);
René Bürgelb6514982008-12-21 02:54:31 -0700964 port->icount.brk++;
965 } else if (status & MPC52xx_PSC_SR_PE) {
Alan Cox33f0f882006-01-09 20:54:13 -0800966 flag = TTY_PARITY;
René Bürgelb6514982008-12-21 02:54:31 -0700967 port->icount.parity++;
968 }
969 else if (status & MPC52xx_PSC_SR_FE) {
Alan Cox33f0f882006-01-09 20:54:13 -0800970 flag = TTY_FRAME;
René Bürgelb6514982008-12-21 02:54:31 -0700971 port->icount.frame++;
972 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973
974 /* Clear error condition */
John Rigby406b7d42008-01-17 08:37:25 +1100975 out_8(&PSC(port)->command, MPC52xx_PSC_RST_ERR_STAT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976
977 }
Alan Cox33f0f882006-01-09 20:54:13 -0800978 tty_insert_flip_char(tty, ch, flag);
979 if (status & MPC52xx_PSC_SR_OE) {
980 /*
981 * Overrun is special, since it's
982 * reported immediately, and doesn't
983 * affect the current character
984 */
985 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
René Bürgelb6514982008-12-21 02:54:31 -0700986 port->icount.overrun++;
Alan Cox33f0f882006-01-09 20:54:13 -0800987 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 }
989
Andrew Liufbe543b2008-04-29 17:36:25 +1000990 spin_unlock(&port->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 tty_flip_buffer_push(tty);
Andrew Liufbe543b2008-04-29 17:36:25 +1000992 spin_lock(&port->lock);
Grant Likely9b9129e2006-11-27 14:21:01 -0700993
John Rigby599f0302008-01-29 04:28:55 +1100994 return psc_ops->raw_rx_rdy(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995}
996
997static inline int
998mpc52xx_uart_int_tx_chars(struct uart_port *port)
999{
Alan Coxebd2c8f2009-09-19 13:13:28 -07001000 struct circ_buf *xmit = &port->state->xmit;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001
1002 /* Process out of band chars */
1003 if (port->x_char) {
John Rigby599f0302008-01-29 04:28:55 +11001004 psc_ops->write_char(port, port->x_char);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005 port->icount.tx++;
1006 port->x_char = 0;
1007 return 1;
1008 }
1009
1010 /* Nothing to do ? */
1011 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
Russell Kingb129a8c2005-08-31 10:12:14 +01001012 mpc52xx_uart_stop_tx(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 return 0;
1014 }
1015
1016 /* Send chars */
John Rigby599f0302008-01-29 04:28:55 +11001017 while (psc_ops->raw_tx_rdy(port)) {
1018 psc_ops->write_char(port, xmit->buf[xmit->tail]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
1020 port->icount.tx++;
1021 if (uart_circ_empty(xmit))
1022 break;
1023 }
1024
1025 /* Wake up */
1026 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
1027 uart_write_wakeup(port);
1028
1029 /* Maybe we're done after all */
1030 if (uart_circ_empty(xmit)) {
Russell Kingb129a8c2005-08-31 10:12:14 +01001031 mpc52xx_uart_stop_tx(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032 return 0;
1033 }
1034
1035 return 1;
1036}
1037
Grant Likely9b9129e2006-11-27 14:21:01 -07001038static irqreturn_t
Anatolij Gustschin6acc6832010-02-16 22:30:03 -07001039mpc5xxx_uart_process_int(struct uart_port *port)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 unsigned long pass = ISR_PASS_LIMIT;
1042 unsigned int keepgoing;
Wolfram Sangaec739e2008-12-21 02:54:32 -07001043 u8 status;
Grant Likely9b9129e2006-11-27 14:21:01 -07001044
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045 /* While we have stuff to do, we continue */
1046 do {
1047 /* If we don't find anything to do, we stop */
Grant Likely9b9129e2006-11-27 14:21:01 -07001048 keepgoing = 0;
1049
John Rigby599f0302008-01-29 04:28:55 +11001050 psc_ops->rx_clr_irq(port);
1051 if (psc_ops->rx_rdy(port))
David Howells7d12e782006-10-05 14:55:46 +01001052 keepgoing |= mpc52xx_uart_int_rx_chars(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053
John Rigby599f0302008-01-29 04:28:55 +11001054 psc_ops->tx_clr_irq(port);
1055 if (psc_ops->tx_rdy(port))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 keepgoing |= mpc52xx_uart_int_tx_chars(port);
Grant Likely9b9129e2006-11-27 14:21:01 -07001057
Wolfram Sangaec739e2008-12-21 02:54:32 -07001058 status = in_8(&PSC(port)->mpc52xx_psc_ipcr);
1059 if (status & MPC52xx_PSC_D_DCD)
1060 uart_handle_dcd_change(port, !(status & MPC52xx_PSC_DCD));
1061
1062 if (status & MPC52xx_PSC_D_CTS)
1063 uart_handle_cts_change(port, !(status & MPC52xx_PSC_CTS));
1064
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 /* Limit number of iteration */
John Rigby406b7d42008-01-17 08:37:25 +11001066 if (!(--pass))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067 keepgoing = 0;
1068
1069 } while (keepgoing);
Grant Likely9b9129e2006-11-27 14:21:01 -07001070
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071 return IRQ_HANDLED;
1072}
1073
Anatolij Gustschin6acc6832010-02-16 22:30:03 -07001074static irqreturn_t
1075mpc52xx_uart_int(int irq, void *dev_id)
1076{
1077 struct uart_port *port = dev_id;
1078 irqreturn_t ret;
1079
1080 spin_lock(&port->lock);
1081
1082 ret = psc_ops->handle_irq(port);
1083
1084 spin_unlock(&port->lock);
1085
1086 return ret;
1087}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088
1089/* ======================================================================== */
1090/* Console ( if applicable ) */
1091/* ======================================================================== */
1092
1093#ifdef CONFIG_SERIAL_MPC52xx_CONSOLE
1094
1095static void __init
1096mpc52xx_console_get_options(struct uart_port *port,
John Rigby406b7d42008-01-17 08:37:25 +11001097 int *baud, int *parity, int *bits, int *flow)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098{
1099 struct mpc52xx_psc __iomem *psc = PSC(port);
1100 unsigned char mr1;
1101
Grant Likelyb9272df2006-11-27 14:21:02 -07001102 pr_debug("mpc52xx_console_get_options(port=%p)\n", port);
1103
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104 /* Read the mode registers */
John Rigby406b7d42008-01-17 08:37:25 +11001105 out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 mr1 = in_8(&psc->mode);
Grant Likely9b9129e2006-11-27 14:21:01 -07001107
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108 /* CT{U,L}R are write-only ! */
Grant Likelyb9272df2006-11-27 14:21:02 -07001109 *baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110
1111 /* Parse them */
1112 switch (mr1 & MPC52xx_PSC_MODE_BITS_MASK) {
John Rigby406b7d42008-01-17 08:37:25 +11001113 case MPC52xx_PSC_MODE_5_BITS:
1114 *bits = 5;
1115 break;
1116 case MPC52xx_PSC_MODE_6_BITS:
1117 *bits = 6;
1118 break;
1119 case MPC52xx_PSC_MODE_7_BITS:
1120 *bits = 7;
1121 break;
1122 case MPC52xx_PSC_MODE_8_BITS:
1123 default:
1124 *bits = 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125 }
Grant Likely9b9129e2006-11-27 14:21:01 -07001126
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127 if (mr1 & MPC52xx_PSC_MODE_PARNONE)
1128 *parity = 'n';
1129 else
1130 *parity = mr1 & MPC52xx_PSC_MODE_PARODD ? 'o' : 'e';
1131}
1132
Grant Likely9b9129e2006-11-27 14:21:01 -07001133static void
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134mpc52xx_console_write(struct console *co, const char *s, unsigned int count)
1135{
1136 struct uart_port *port = &mpc52xx_uart_ports[co->index];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 unsigned int i, j;
Grant Likely9b9129e2006-11-27 14:21:01 -07001138
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139 /* Disable interrupts */
John Rigby599f0302008-01-29 04:28:55 +11001140 psc_ops->cw_disable_ints(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141
1142 /* Wait the TX buffer to be empty */
Grant Likely9b9129e2006-11-27 14:21:01 -07001143 j = 5000000; /* Maximum wait */
John Rigby599f0302008-01-29 04:28:55 +11001144 while (!mpc52xx_uart_tx_empty(port) && --j)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145 udelay(1);
1146
1147 /* Write all the chars */
Russell Kingd3587882006-03-20 20:00:09 +00001148 for (i = 0; i < count; i++, s++) {
1149 /* Line return handling */
1150 if (*s == '\n')
John Rigby599f0302008-01-29 04:28:55 +11001151 psc_ops->write_char(port, '\r');
Grant Likely9b9129e2006-11-27 14:21:01 -07001152
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 /* Send the char */
John Rigby599f0302008-01-29 04:28:55 +11001154 psc_ops->write_char(port, *s);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156 /* Wait the TX buffer to be empty */
Grant Likely9b9129e2006-11-27 14:21:01 -07001157 j = 20000; /* Maximum wait */
John Rigby599f0302008-01-29 04:28:55 +11001158 while (!mpc52xx_uart_tx_empty(port) && --j)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159 udelay(1);
1160 }
1161
1162 /* Restore interrupt state */
John Rigby599f0302008-01-29 04:28:55 +11001163 psc_ops->cw_restore_ints(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164}
1165
Grant Likelyb9272df2006-11-27 14:21:02 -07001166
1167static int __init
1168mpc52xx_console_setup(struct console *co, char *options)
1169{
1170 struct uart_port *port = &mpc52xx_uart_ports[co->index];
1171 struct device_node *np = mpc52xx_uart_nodes[co->index];
John Rigby599f0302008-01-29 04:28:55 +11001172 unsigned int uartclk;
Grant Likelyb9272df2006-11-27 14:21:02 -07001173 struct resource res;
1174 int ret;
1175
1176 int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
1177 int bits = 8;
1178 int parity = 'n';
1179 int flow = 'n';
1180
1181 pr_debug("mpc52xx_console_setup co=%p, co->index=%i, options=%s\n",
1182 co, co->index, options);
1183
Roel Kluinb898f4f2009-05-28 14:34:29 -07001184 if ((co->index < 0) || (co->index >= MPC52xx_PSC_MAXNUM)) {
Grant Likelyb9272df2006-11-27 14:21:02 -07001185 pr_debug("PSC%x out of range\n", co->index);
1186 return -EINVAL;
1187 }
1188
1189 if (!np) {
1190 pr_debug("PSC%x not found in device tree\n", co->index);
1191 return -EINVAL;
1192 }
1193
1194 pr_debug("Console on ttyPSC%x is %s\n",
John Rigby406b7d42008-01-17 08:37:25 +11001195 co->index, mpc52xx_uart_nodes[co->index]->full_name);
Grant Likelyb9272df2006-11-27 14:21:02 -07001196
1197 /* Fetch register locations */
John Rigby406b7d42008-01-17 08:37:25 +11001198 ret = of_address_to_resource(np, 0, &res);
1199 if (ret) {
Grant Likelyb9272df2006-11-27 14:21:02 -07001200 pr_debug("Could not get resources for PSC%x\n", co->index);
1201 return ret;
1202 }
1203
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +00001204 uartclk = mpc5xxx_get_bus_frequency(np);
John Rigby599f0302008-01-29 04:28:55 +11001205 if (uartclk == 0) {
1206 pr_debug("Could not find uart clock frequency!\n");
Grant Likelyb9272df2006-11-27 14:21:02 -07001207 return -EINVAL;
1208 }
1209
1210 /* Basic port init. Needed since we use some uart_??? func before
1211 * real init for early access */
1212 spin_lock_init(&port->lock);
John Rigby599f0302008-01-29 04:28:55 +11001213 port->uartclk = uartclk;
Grant Likelyb9272df2006-11-27 14:21:02 -07001214 port->ops = &mpc52xx_uart_ops;
1215 port->mapbase = res.start;
1216 port->membase = ioremap(res.start, sizeof(struct mpc52xx_psc));
1217 port->irq = irq_of_parse_and_map(np, 0);
1218
1219 if (port->membase == NULL)
1220 return -EINVAL;
1221
Grant Likely5dd80d52007-10-13 22:37:02 -06001222 pr_debug("mpc52xx-psc uart at %p, mapped to %p, irq=%x, freq=%i\n",
John Rigby406b7d42008-01-17 08:37:25 +11001223 (void *)port->mapbase, port->membase,
1224 port->irq, port->uartclk);
Grant Likelyb9272df2006-11-27 14:21:02 -07001225
1226 /* Setup the port parameters accoding to options */
1227 if (options)
1228 uart_parse_options(options, &baud, &parity, &bits, &flow);
1229 else
1230 mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow);
1231
1232 pr_debug("Setting console parameters: %i %i%c1 flow=%c\n",
John Rigby406b7d42008-01-17 08:37:25 +11001233 baud, bits, parity, flow);
Grant Likelyb9272df2006-11-27 14:21:02 -07001234
1235 return uart_set_options(port, co, baud, parity, bits, flow);
1236}
Grant Likelyb9272df2006-11-27 14:21:02 -07001237
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238
Sylvain Munaut2d8179c2006-01-06 00:11:31 -08001239static struct uart_driver mpc52xx_uart_driver;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240
1241static struct console mpc52xx_console = {
Sylvain Munautd62de3a2006-01-06 00:11:32 -08001242 .name = "ttyPSC",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243 .write = mpc52xx_console_write,
1244 .device = uart_console_device,
1245 .setup = mpc52xx_console_setup,
1246 .flags = CON_PRINTBUFFER,
John Rigby406b7d42008-01-17 08:37:25 +11001247 .index = -1, /* Specified on the cmdline (e.g. console=ttyPSC0) */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248 .data = &mpc52xx_uart_driver,
1249};
1250
Grant Likely9b9129e2006-11-27 14:21:01 -07001251
1252static int __init
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253mpc52xx_console_init(void)
1254{
Grant Likelyb9272df2006-11-27 14:21:02 -07001255 mpc52xx_uart_of_enumerate();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256 register_console(&mpc52xx_console);
1257 return 0;
1258}
1259
1260console_initcall(mpc52xx_console_init);
1261
1262#define MPC52xx_PSC_CONSOLE &mpc52xx_console
1263#else
1264#define MPC52xx_PSC_CONSOLE NULL
1265#endif
1266
1267
1268/* ======================================================================== */
1269/* UART Driver */
1270/* ======================================================================== */
1271
1272static struct uart_driver mpc52xx_uart_driver = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273 .driver_name = "mpc52xx_psc_uart",
Sylvain Munautd62de3a2006-01-06 00:11:32 -08001274 .dev_name = "ttyPSC",
Sylvain Munautd62de3a2006-01-06 00:11:32 -08001275 .major = SERIAL_PSC_MAJOR,
1276 .minor = SERIAL_PSC_MINOR,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277 .nr = MPC52xx_PSC_MAXNUM,
1278 .cons = MPC52xx_PSC_CONSOLE,
1279};
1280
Grant Likelyb9272df2006-11-27 14:21:02 -07001281/* ======================================================================== */
1282/* OF Platform Driver */
1283/* ======================================================================== */
1284
Grant Likely52b80482008-02-06 22:29:25 -07001285static struct of_device_id mpc52xx_uart_of_match[] = {
1286#ifdef CONFIG_PPC_MPC52xx
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +00001287 { .compatible = "fsl,mpc5200b-psc-uart", .data = &mpc5200b_psc_ops, },
Grant Likely52b80482008-02-06 22:29:25 -07001288 { .compatible = "fsl,mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
1289 /* binding used by old lite5200 device trees: */
1290 { .compatible = "mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
1291 /* binding used by efika: */
1292 { .compatible = "mpc5200-serial", .data = &mpc52xx_psc_ops, },
1293#endif
1294#ifdef CONFIG_PPC_MPC512x
1295 { .compatible = "fsl,mpc5121-psc-uart", .data = &mpc512x_psc_ops, },
Grant Likely52b80482008-02-06 22:29:25 -07001296#endif
Grant Likelybc775ea2008-04-29 06:40:37 -06001297 {},
Grant Likely52b80482008-02-06 22:29:25 -07001298};
1299
Grant Likelyb9272df2006-11-27 14:21:02 -07001300static int __devinit
1301mpc52xx_uart_of_probe(struct of_device *op, const struct of_device_id *match)
1302{
1303 int idx = -1;
John Rigby599f0302008-01-29 04:28:55 +11001304 unsigned int uartclk;
Grant Likelyb9272df2006-11-27 14:21:02 -07001305 struct uart_port *port = NULL;
1306 struct resource res;
1307 int ret;
1308
1309 dev_dbg(&op->dev, "mpc52xx_uart_probe(op=%p, match=%p)\n", op, match);
1310
1311 /* Check validity & presence */
1312 for (idx = 0; idx < MPC52xx_PSC_MAXNUM; idx++)
Grant Likely61c7a082010-04-13 16:12:29 -07001313 if (mpc52xx_uart_nodes[idx] == op->dev.of_node)
Grant Likelyb9272df2006-11-27 14:21:02 -07001314 break;
1315 if (idx >= MPC52xx_PSC_MAXNUM)
1316 return -EINVAL;
1317 pr_debug("Found %s assigned to ttyPSC%x\n",
John Rigby406b7d42008-01-17 08:37:25 +11001318 mpc52xx_uart_nodes[idx]->full_name, idx);
Grant Likelyb9272df2006-11-27 14:21:02 -07001319
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +00001320 /* set the uart clock to the input clock of the psc, the different
1321 * prescalers are taken into account in the set_baudrate() methods
1322 * of the respective chip */
1323 uartclk = mpc5xxx_get_bus_frequency(op->dev.of_node);
John Rigby599f0302008-01-29 04:28:55 +11001324 if (uartclk == 0) {
1325 dev_dbg(&op->dev, "Could not find uart clock frequency!\n");
Grant Likelyb9272df2006-11-27 14:21:02 -07001326 return -EINVAL;
1327 }
1328
1329 /* Init the port structure */
1330 port = &mpc52xx_uart_ports[idx];
1331
1332 spin_lock_init(&port->lock);
John Rigby599f0302008-01-29 04:28:55 +11001333 port->uartclk = uartclk;
Grant Likelyb9272df2006-11-27 14:21:02 -07001334 port->fifosize = 512;
1335 port->iotype = UPIO_MEM;
1336 port->flags = UPF_BOOT_AUTOCONF |
John Rigby406b7d42008-01-17 08:37:25 +11001337 (uart_console(port) ? 0 : UPF_IOREMAP);
Grant Likelyb9272df2006-11-27 14:21:02 -07001338 port->line = idx;
1339 port->ops = &mpc52xx_uart_ops;
1340 port->dev = &op->dev;
1341
1342 /* Search for IRQ and mapbase */
Grant Likely61c7a082010-04-13 16:12:29 -07001343 ret = of_address_to_resource(op->dev.of_node, 0, &res);
John Rigby406b7d42008-01-17 08:37:25 +11001344 if (ret)
Grant Likelyb9272df2006-11-27 14:21:02 -07001345 return ret;
1346
1347 port->mapbase = res.start;
Wolfram Sang418441d92008-12-21 02:54:32 -07001348 if (!port->mapbase) {
1349 dev_dbg(&op->dev, "Could not allocate resources for PSC\n");
1350 return -EINVAL;
1351 }
1352
Grant Likely61c7a082010-04-13 16:12:29 -07001353 psc_ops->get_irq(port, op->dev.of_node);
Wolfram Sang418441d92008-12-21 02:54:32 -07001354 if (port->irq == NO_IRQ) {
1355 dev_dbg(&op->dev, "Could not get irq\n");
1356 return -EINVAL;
1357 }
Grant Likelyb9272df2006-11-27 14:21:02 -07001358
Grant Likely5dd80d52007-10-13 22:37:02 -06001359 dev_dbg(&op->dev, "mpc52xx-psc uart at %p, irq=%x, freq=%i\n",
John Rigby406b7d42008-01-17 08:37:25 +11001360 (void *)port->mapbase, port->irq, port->uartclk);
Grant Likelyb9272df2006-11-27 14:21:02 -07001361
Grant Likelyb9272df2006-11-27 14:21:02 -07001362 /* Add the port to the uart sub-system */
1363 ret = uart_add_one_port(&mpc52xx_uart_driver, port);
Anatolij Gustschin6acc6832010-02-16 22:30:03 -07001364 if (ret)
Wolfram Sang418441d92008-12-21 02:54:32 -07001365 return ret;
Grant Likelyb9272df2006-11-27 14:21:02 -07001366
Wolfram Sang418441d92008-12-21 02:54:32 -07001367 dev_set_drvdata(&op->dev, (void *)port);
1368 return 0;
Grant Likelyb9272df2006-11-27 14:21:02 -07001369}
1370
1371static int
1372mpc52xx_uart_of_remove(struct of_device *op)
1373{
1374 struct uart_port *port = dev_get_drvdata(&op->dev);
1375 dev_set_drvdata(&op->dev, NULL);
1376
Anatolij Gustschin6acc6832010-02-16 22:30:03 -07001377 if (port)
Grant Likelyb9272df2006-11-27 14:21:02 -07001378 uart_remove_one_port(&mpc52xx_uart_driver, port);
1379
1380 return 0;
1381}
1382
1383#ifdef CONFIG_PM
1384static int
1385mpc52xx_uart_of_suspend(struct of_device *op, pm_message_t state)
1386{
1387 struct uart_port *port = (struct uart_port *) dev_get_drvdata(&op->dev);
1388
1389 if (port)
1390 uart_suspend_port(&mpc52xx_uart_driver, port);
1391
1392 return 0;
1393}
1394
1395static int
1396mpc52xx_uart_of_resume(struct of_device *op)
1397{
1398 struct uart_port *port = (struct uart_port *) dev_get_drvdata(&op->dev);
1399
1400 if (port)
1401 uart_resume_port(&mpc52xx_uart_driver, port);
1402
1403 return 0;
1404}
1405#endif
1406
1407static void
Grant Likely3b5ebf82009-02-03 12:30:25 -07001408mpc52xx_uart_of_assign(struct device_node *np)
Grant Likelyb9272df2006-11-27 14:21:02 -07001409{
Grant Likelyb9272df2006-11-27 14:21:02 -07001410 int i;
1411
Grant Likely3b5ebf82009-02-03 12:30:25 -07001412 /* Find the first free PSC number */
Grant Likelyb9272df2006-11-27 14:21:02 -07001413 for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
1414 if (mpc52xx_uart_nodes[i] == NULL) {
Grant Likely3b5ebf82009-02-03 12:30:25 -07001415 of_node_get(np);
1416 mpc52xx_uart_nodes[i] = np;
1417 return;
Grant Likelyb9272df2006-11-27 14:21:02 -07001418 }
1419 }
Grant Likelyb9272df2006-11-27 14:21:02 -07001420}
1421
1422static void
1423mpc52xx_uart_of_enumerate(void)
1424{
John Rigby406b7d42008-01-17 08:37:25 +11001425 static int enum_done;
Grant Likelyb9272df2006-11-27 14:21:02 -07001426 struct device_node *np;
John Rigby25ae3a02008-01-29 04:28:56 +11001427 const struct of_device_id *match;
Grant Likelyb9272df2006-11-27 14:21:02 -07001428 int i;
1429
1430 if (enum_done)
1431 return;
1432
Grant Likely3b5ebf82009-02-03 12:30:25 -07001433 /* Assign index to each PSC in device tree */
1434 for_each_matching_node(np, mpc52xx_uart_of_match) {
John Rigby25ae3a02008-01-29 04:28:56 +11001435 match = of_match_node(mpc52xx_uart_of_match, np);
John Rigby25ae3a02008-01-29 04:28:56 +11001436 psc_ops = match->data;
Grant Likely3b5ebf82009-02-03 12:30:25 -07001437 mpc52xx_uart_of_assign(np);
Grant Likelyb9272df2006-11-27 14:21:02 -07001438 }
1439
1440 enum_done = 1;
1441
1442 for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
1443 if (mpc52xx_uart_nodes[i])
1444 pr_debug("%s assigned to ttyPSC%x\n",
John Rigby406b7d42008-01-17 08:37:25 +11001445 mpc52xx_uart_nodes[i]->full_name, i);
Grant Likelyb9272df2006-11-27 14:21:02 -07001446 }
1447}
1448
1449MODULE_DEVICE_TABLE(of, mpc52xx_uart_of_match);
1450
1451static struct of_platform_driver mpc52xx_uart_of_driver = {
Grant Likelyb9272df2006-11-27 14:21:02 -07001452 .probe = mpc52xx_uart_of_probe,
1453 .remove = mpc52xx_uart_of_remove,
1454#ifdef CONFIG_PM
1455 .suspend = mpc52xx_uart_of_suspend,
1456 .resume = mpc52xx_uart_of_resume,
1457#endif
Grant Likely40182942010-04-13 16:13:02 -07001458 .driver = {
1459 .name = "mpc52xx-psc-uart",
1460 .owner = THIS_MODULE,
1461 .of_match_table = mpc52xx_uart_of_match,
Grant Likelyb9272df2006-11-27 14:21:02 -07001462 },
1463};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464
1465
1466/* ======================================================================== */
1467/* Module */
1468/* ======================================================================== */
1469
1470static int __init
1471mpc52xx_uart_init(void)
1472{
1473 int ret;
1474
Grant Likelyb9272df2006-11-27 14:21:02 -07001475 printk(KERN_INFO "Serial: MPC52xx PSC UART driver\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476
John Rigby406b7d42008-01-17 08:37:25 +11001477 ret = uart_register_driver(&mpc52xx_uart_driver);
1478 if (ret) {
Grant Likelyb9272df2006-11-27 14:21:02 -07001479 printk(KERN_ERR "%s: uart_register_driver failed (%i)\n",
1480 __FILE__, ret);
1481 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482 }
1483
Grant Likelyb9272df2006-11-27 14:21:02 -07001484 mpc52xx_uart_of_enumerate();
1485
Anatolij Gustschin6acc6832010-02-16 22:30:03 -07001486 /*
1487 * Map the PSC FIFO Controller and init if on MPC512x.
1488 */
Anatolij Gustschine6114fa2010-05-05 00:18:59 +02001489 if (psc_ops && psc_ops->fifoc_init) {
Anatolij Gustschin6acc6832010-02-16 22:30:03 -07001490 ret = psc_ops->fifoc_init();
1491 if (ret)
1492 return ret;
1493 }
1494
Grant Likelyb9272df2006-11-27 14:21:02 -07001495 ret = of_register_platform_driver(&mpc52xx_uart_of_driver);
1496 if (ret) {
1497 printk(KERN_ERR "%s: of_register_platform_driver failed (%i)\n",
1498 __FILE__, ret);
1499 uart_unregister_driver(&mpc52xx_uart_driver);
1500 return ret;
1501 }
Grant Likelyb9272df2006-11-27 14:21:02 -07001502
1503 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504}
1505
1506static void __exit
1507mpc52xx_uart_exit(void)
1508{
Anatolij Gustschin6acc6832010-02-16 22:30:03 -07001509 if (psc_ops->fifoc_uninit)
1510 psc_ops->fifoc_uninit();
1511
Grant Likelyb9272df2006-11-27 14:21:02 -07001512 of_unregister_platform_driver(&mpc52xx_uart_of_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513 uart_unregister_driver(&mpc52xx_uart_driver);
1514}
1515
1516
1517module_init(mpc52xx_uart_init);
1518module_exit(mpc52xx_uart_exit);
1519
1520MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
1521MODULE_DESCRIPTION("Freescale MPC52xx PSC UART");
1522MODULE_LICENSE("GPL");