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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>
Jiri Slabyee160a32011-09-01 16:20:57 +020037#include <linux/tty_flip.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <linux/serial.h>
39#include <linux/sysrq.h>
40#include <linux/console.h>
John Rigby406b7d42008-01-17 08:37:25 +110041#include <linux/delay.h>
42#include <linux/io.h>
Grant Likely283029d2008-01-09 06:20:40 +110043#include <linux/of.h>
44#include <linux/of_platform.h>
Anatolij Gustschin6acc6832010-02-16 22:30:03 -070045#include <linux/clk.h>
Grant Likelyb9272df2006-11-27 14:21:02 -070046
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#include <asm/mpc52xx.h>
48#include <asm/mpc52xx_psc.h>
49
50#if defined(CONFIG_SERIAL_MPC52xx_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
51#define SUPPORT_SYSRQ
52#endif
53
54#include <linux/serial_core.h>
55
56
Sylvain Munautd62de3a2006-01-06 00:11:32 -080057/* We've been assigned a range on the "Low-density serial ports" major */
58#define SERIAL_PSC_MAJOR 204
59#define SERIAL_PSC_MINOR 148
60
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
62#define ISR_PASS_LIMIT 256 /* Max number of iteration in the interrupt */
63
64
65static struct uart_port mpc52xx_uart_ports[MPC52xx_PSC_MAXNUM];
66 /* Rem: - We use the read_status_mask as a shadow of
67 * psc->mpc52xx_psc_imr
68 * - It's important that is array is all zero on start as we
69 * use it to know if it's initialized or not ! If it's not sure
70 * it's cleared, then a memset(...,0,...) should be added to
71 * the console_init
72 */
Kumar Gala8d1fb8c2008-08-01 11:09:34 -050073
Grant Likelyb9272df2006-11-27 14:21:02 -070074/* lookup table for matching device nodes to index numbers */
75static struct device_node *mpc52xx_uart_nodes[MPC52xx_PSC_MAXNUM];
76
77static void mpc52xx_uart_of_enumerate(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
John Rigby599f0302008-01-29 04:28:55 +110079
Linus Torvalds1da177e2005-04-16 15:20:36 -070080#define PSC(port) ((struct mpc52xx_psc __iomem *)((port)->membase))
81
82
83/* Forward declaration of the interruption handling routine */
John Rigby406b7d42008-01-17 08:37:25 +110084static irqreturn_t mpc52xx_uart_int(int irq, void *dev_id);
Anatolij Gustschin6acc6832010-02-16 22:30:03 -070085static irqreturn_t mpc5xxx_uart_process_int(struct uart_port *port);
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
87
88/* Simple macro to test if a port is console or not. This one is taken
89 * for serial_core.c and maybe should be moved to serial_core.h ? */
90#ifdef CONFIG_SERIAL_CORE_CONSOLE
John Rigby406b7d42008-01-17 08:37:25 +110091#define uart_console(port) \
92 ((port)->cons && (port)->cons->index == (port)->line)
Linus Torvalds1da177e2005-04-16 15:20:36 -070093#else
94#define uart_console(port) (0)
95#endif
96
John Rigby599f0302008-01-29 04:28:55 +110097/* ======================================================================== */
98/* PSC fifo operations for isolating differences between 52xx and 512x */
99/* ======================================================================== */
100
101struct psc_ops {
102 void (*fifo_init)(struct uart_port *port);
103 int (*raw_rx_rdy)(struct uart_port *port);
104 int (*raw_tx_rdy)(struct uart_port *port);
105 int (*rx_rdy)(struct uart_port *port);
106 int (*tx_rdy)(struct uart_port *port);
107 int (*tx_empty)(struct uart_port *port);
108 void (*stop_rx)(struct uart_port *port);
109 void (*start_tx)(struct uart_port *port);
110 void (*stop_tx)(struct uart_port *port);
111 void (*rx_clr_irq)(struct uart_port *port);
112 void (*tx_clr_irq)(struct uart_port *port);
113 void (*write_char)(struct uart_port *port, unsigned char c);
114 unsigned char (*read_char)(struct uart_port *port);
115 void (*cw_disable_ints)(struct uart_port *port);
116 void (*cw_restore_ints)(struct uart_port *port);
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000117 unsigned int (*set_baudrate)(struct uart_port *port,
118 struct ktermios *new,
119 struct ktermios *old);
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700120 int (*clock)(struct uart_port *port, int enable);
121 int (*fifoc_init)(void);
122 void (*fifoc_uninit)(void);
123 void (*get_irq)(struct uart_port *, struct device_node *);
124 irqreturn_t (*handle_irq)(struct uart_port *port);
John Rigby599f0302008-01-29 04:28:55 +1100125};
126
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000127/* setting the prescaler and divisor reg is common for all chips */
128static inline void mpc52xx_set_divisor(struct mpc52xx_psc __iomem *psc,
129 u16 prescaler, unsigned int divisor)
130{
131 /* select prescaler */
132 out_be16(&psc->mpc52xx_psc_clock_select, prescaler);
133 out_8(&psc->ctur, divisor >> 8);
134 out_8(&psc->ctlr, divisor & 0xff);
135}
136
John Rigby25ae3a02008-01-29 04:28:56 +1100137#ifdef CONFIG_PPC_MPC52xx
John Rigby599f0302008-01-29 04:28:55 +1100138#define FIFO_52xx(port) ((struct mpc52xx_psc_fifo __iomem *)(PSC(port)+1))
139static void mpc52xx_psc_fifo_init(struct uart_port *port)
140{
141 struct mpc52xx_psc __iomem *psc = PSC(port);
142 struct mpc52xx_psc_fifo __iomem *fifo = FIFO_52xx(port);
143
John Rigby599f0302008-01-29 04:28:55 +1100144 out_8(&fifo->rfcntl, 0x00);
145 out_be16(&fifo->rfalarm, 0x1ff);
146 out_8(&fifo->tfcntl, 0x07);
147 out_be16(&fifo->tfalarm, 0x80);
148
149 port->read_status_mask |= MPC52xx_PSC_IMR_RXRDY | MPC52xx_PSC_IMR_TXRDY;
150 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
151}
152
153static int mpc52xx_psc_raw_rx_rdy(struct uart_port *port)
154{
155 return in_be16(&PSC(port)->mpc52xx_psc_status)
156 & MPC52xx_PSC_SR_RXRDY;
157}
158
159static int mpc52xx_psc_raw_tx_rdy(struct uart_port *port)
160{
161 return in_be16(&PSC(port)->mpc52xx_psc_status)
162 & MPC52xx_PSC_SR_TXRDY;
163}
164
165
166static int mpc52xx_psc_rx_rdy(struct uart_port *port)
167{
168 return in_be16(&PSC(port)->mpc52xx_psc_isr)
169 & port->read_status_mask
170 & MPC52xx_PSC_IMR_RXRDY;
171}
172
173static int mpc52xx_psc_tx_rdy(struct uart_port *port)
174{
175 return in_be16(&PSC(port)->mpc52xx_psc_isr)
176 & port->read_status_mask
177 & MPC52xx_PSC_IMR_TXRDY;
178}
179
180static int mpc52xx_psc_tx_empty(struct uart_port *port)
181{
182 return in_be16(&PSC(port)->mpc52xx_psc_status)
183 & MPC52xx_PSC_SR_TXEMP;
184}
185
186static void mpc52xx_psc_start_tx(struct uart_port *port)
187{
188 port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY;
189 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
190}
191
192static void mpc52xx_psc_stop_tx(struct uart_port *port)
193{
194 port->read_status_mask &= ~MPC52xx_PSC_IMR_TXRDY;
195 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
196}
197
198static void mpc52xx_psc_stop_rx(struct uart_port *port)
199{
200 port->read_status_mask &= ~MPC52xx_PSC_IMR_RXRDY;
201 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
202}
203
204static void mpc52xx_psc_rx_clr_irq(struct uart_port *port)
205{
206}
207
208static void mpc52xx_psc_tx_clr_irq(struct uart_port *port)
209{
210}
211
212static void mpc52xx_psc_write_char(struct uart_port *port, unsigned char c)
213{
214 out_8(&PSC(port)->mpc52xx_psc_buffer_8, c);
215}
216
217static unsigned char mpc52xx_psc_read_char(struct uart_port *port)
218{
219 return in_8(&PSC(port)->mpc52xx_psc_buffer_8);
220}
221
222static void mpc52xx_psc_cw_disable_ints(struct uart_port *port)
223{
224 out_be16(&PSC(port)->mpc52xx_psc_imr, 0);
225}
226
227static void mpc52xx_psc_cw_restore_ints(struct uart_port *port)
228{
229 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
230}
231
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000232static unsigned int mpc5200_psc_set_baudrate(struct uart_port *port,
233 struct ktermios *new,
234 struct ktermios *old)
John Rigby599f0302008-01-29 04:28:55 +1100235{
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000236 unsigned int baud;
237 unsigned int divisor;
238
239 /* The 5200 has a fixed /32 prescaler, uartclk contains the ipb freq */
240 baud = uart_get_baud_rate(port, new, old,
241 port->uartclk / (32 * 0xffff) + 1,
242 port->uartclk / 32);
243 divisor = (port->uartclk + 16 * baud) / (32 * baud);
244
245 /* enable the /32 prescaler and set the divisor */
246 mpc52xx_set_divisor(PSC(port), 0xdd00, divisor);
247 return baud;
248}
249
250static unsigned int mpc5200b_psc_set_baudrate(struct uart_port *port,
251 struct ktermios *new,
252 struct ktermios *old)
253{
254 unsigned int baud;
255 unsigned int divisor;
256 u16 prescaler;
257
258 /* The 5200B has a selectable /4 or /32 prescaler, uartclk contains the
259 * ipb freq */
260 baud = uart_get_baud_rate(port, new, old,
261 port->uartclk / (32 * 0xffff) + 1,
262 port->uartclk / 4);
263 divisor = (port->uartclk + 2 * baud) / (4 * baud);
264
Frank Benkerte0955ac2012-03-05 16:14:29 +0100265 /* select the proper prescaler and set the divisor
266 * prefer high prescaler for more tolerance on low baudrates */
267 if (divisor > 0xffff || baud <= 115200) {
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000268 divisor = (divisor + 4) / 8;
269 prescaler = 0xdd00; /* /32 */
270 } else
271 prescaler = 0xff00; /* /4 */
272 mpc52xx_set_divisor(PSC(port), prescaler, divisor);
273 return baud;
John Rigby599f0302008-01-29 04:28:55 +1100274}
275
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700276static void mpc52xx_psc_get_irq(struct uart_port *port, struct device_node *np)
277{
Yong Zhang9cfb5c02011-09-22 16:59:15 +0800278 port->irqflags = 0;
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700279 port->irq = irq_of_parse_and_map(np, 0);
280}
281
282/* 52xx specific interrupt handler. The caller holds the port lock */
283static irqreturn_t mpc52xx_psc_handle_irq(struct uart_port *port)
284{
285 return mpc5xxx_uart_process_int(port);
286}
287
John Rigby599f0302008-01-29 04:28:55 +1100288static struct psc_ops mpc52xx_psc_ops = {
289 .fifo_init = mpc52xx_psc_fifo_init,
290 .raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
291 .raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
292 .rx_rdy = mpc52xx_psc_rx_rdy,
293 .tx_rdy = mpc52xx_psc_tx_rdy,
294 .tx_empty = mpc52xx_psc_tx_empty,
295 .stop_rx = mpc52xx_psc_stop_rx,
296 .start_tx = mpc52xx_psc_start_tx,
297 .stop_tx = mpc52xx_psc_stop_tx,
298 .rx_clr_irq = mpc52xx_psc_rx_clr_irq,
299 .tx_clr_irq = mpc52xx_psc_tx_clr_irq,
300 .write_char = mpc52xx_psc_write_char,
301 .read_char = mpc52xx_psc_read_char,
302 .cw_disable_ints = mpc52xx_psc_cw_disable_ints,
303 .cw_restore_ints = mpc52xx_psc_cw_restore_ints,
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000304 .set_baudrate = mpc5200_psc_set_baudrate,
305 .get_irq = mpc52xx_psc_get_irq,
306 .handle_irq = mpc52xx_psc_handle_irq,
307};
308
309static struct psc_ops mpc5200b_psc_ops = {
310 .fifo_init = mpc52xx_psc_fifo_init,
311 .raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
312 .raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
313 .rx_rdy = mpc52xx_psc_rx_rdy,
314 .tx_rdy = mpc52xx_psc_tx_rdy,
315 .tx_empty = mpc52xx_psc_tx_empty,
316 .stop_rx = mpc52xx_psc_stop_rx,
317 .start_tx = mpc52xx_psc_start_tx,
318 .stop_tx = mpc52xx_psc_stop_tx,
319 .rx_clr_irq = mpc52xx_psc_rx_clr_irq,
320 .tx_clr_irq = mpc52xx_psc_tx_clr_irq,
321 .write_char = mpc52xx_psc_write_char,
322 .read_char = mpc52xx_psc_read_char,
323 .cw_disable_ints = mpc52xx_psc_cw_disable_ints,
324 .cw_restore_ints = mpc52xx_psc_cw_restore_ints,
325 .set_baudrate = mpc5200b_psc_set_baudrate,
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700326 .get_irq = mpc52xx_psc_get_irq,
327 .handle_irq = mpc52xx_psc_handle_irq,
John Rigby599f0302008-01-29 04:28:55 +1100328};
329
John Rigby25ae3a02008-01-29 04:28:56 +1100330#endif /* CONFIG_MPC52xx */
331
332#ifdef CONFIG_PPC_MPC512x
333#define FIFO_512x(port) ((struct mpc512x_psc_fifo __iomem *)(PSC(port)+1))
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700334
335/* PSC FIFO Controller for mpc512x */
336struct psc_fifoc {
337 u32 fifoc_cmd;
338 u32 fifoc_int;
339 u32 fifoc_dma;
340 u32 fifoc_axe;
341 u32 fifoc_debug;
342};
343
344static struct psc_fifoc __iomem *psc_fifoc;
345static unsigned int psc_fifoc_irq;
346
John Rigby25ae3a02008-01-29 04:28:56 +1100347static void mpc512x_psc_fifo_init(struct uart_port *port)
348{
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700349 /* /32 prescaler */
350 out_be16(&PSC(port)->mpc52xx_psc_clock_select, 0xdd00);
351
John Rigby25ae3a02008-01-29 04:28:56 +1100352 out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_RESET_SLICE);
353 out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
354 out_be32(&FIFO_512x(port)->txalarm, 1);
355 out_be32(&FIFO_512x(port)->tximr, 0);
356
357 out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_RESET_SLICE);
358 out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
359 out_be32(&FIFO_512x(port)->rxalarm, 1);
360 out_be32(&FIFO_512x(port)->rximr, 0);
361
362 out_be32(&FIFO_512x(port)->tximr, MPC512x_PSC_FIFO_ALARM);
363 out_be32(&FIFO_512x(port)->rximr, MPC512x_PSC_FIFO_ALARM);
364}
365
366static int mpc512x_psc_raw_rx_rdy(struct uart_port *port)
367{
368 return !(in_be32(&FIFO_512x(port)->rxsr) & MPC512x_PSC_FIFO_EMPTY);
369}
370
371static int mpc512x_psc_raw_tx_rdy(struct uart_port *port)
372{
373 return !(in_be32(&FIFO_512x(port)->txsr) & MPC512x_PSC_FIFO_FULL);
374}
375
376static int mpc512x_psc_rx_rdy(struct uart_port *port)
377{
378 return in_be32(&FIFO_512x(port)->rxsr)
379 & in_be32(&FIFO_512x(port)->rximr)
380 & MPC512x_PSC_FIFO_ALARM;
381}
382
383static int mpc512x_psc_tx_rdy(struct uart_port *port)
384{
385 return in_be32(&FIFO_512x(port)->txsr)
386 & in_be32(&FIFO_512x(port)->tximr)
387 & MPC512x_PSC_FIFO_ALARM;
388}
389
390static int mpc512x_psc_tx_empty(struct uart_port *port)
391{
392 return in_be32(&FIFO_512x(port)->txsr)
393 & MPC512x_PSC_FIFO_EMPTY;
394}
395
396static void mpc512x_psc_stop_rx(struct uart_port *port)
397{
398 unsigned long rx_fifo_imr;
399
400 rx_fifo_imr = in_be32(&FIFO_512x(port)->rximr);
401 rx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
402 out_be32(&FIFO_512x(port)->rximr, rx_fifo_imr);
403}
404
405static void mpc512x_psc_start_tx(struct uart_port *port)
406{
407 unsigned long tx_fifo_imr;
408
409 tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
410 tx_fifo_imr |= MPC512x_PSC_FIFO_ALARM;
411 out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
412}
413
414static void mpc512x_psc_stop_tx(struct uart_port *port)
415{
416 unsigned long tx_fifo_imr;
417
418 tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
419 tx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
420 out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
421}
422
423static void mpc512x_psc_rx_clr_irq(struct uart_port *port)
424{
425 out_be32(&FIFO_512x(port)->rxisr, in_be32(&FIFO_512x(port)->rxisr));
426}
427
428static void mpc512x_psc_tx_clr_irq(struct uart_port *port)
429{
430 out_be32(&FIFO_512x(port)->txisr, in_be32(&FIFO_512x(port)->txisr));
431}
432
433static void mpc512x_psc_write_char(struct uart_port *port, unsigned char c)
434{
435 out_8(&FIFO_512x(port)->txdata_8, c);
436}
437
438static unsigned char mpc512x_psc_read_char(struct uart_port *port)
439{
440 return in_8(&FIFO_512x(port)->rxdata_8);
441}
442
443static void mpc512x_psc_cw_disable_ints(struct uart_port *port)
444{
445 port->read_status_mask =
446 in_be32(&FIFO_512x(port)->tximr) << 16 |
447 in_be32(&FIFO_512x(port)->rximr);
448 out_be32(&FIFO_512x(port)->tximr, 0);
449 out_be32(&FIFO_512x(port)->rximr, 0);
450}
451
452static void mpc512x_psc_cw_restore_ints(struct uart_port *port)
453{
454 out_be32(&FIFO_512x(port)->tximr,
455 (port->read_status_mask >> 16) & 0x7f);
456 out_be32(&FIFO_512x(port)->rximr, port->read_status_mask & 0x7f);
457}
458
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000459static unsigned int mpc512x_psc_set_baudrate(struct uart_port *port,
460 struct ktermios *new,
461 struct ktermios *old)
John Rigby25ae3a02008-01-29 04:28:56 +1100462{
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000463 unsigned int baud;
464 unsigned int divisor;
465
466 /*
467 * The "MPC5121e Microcontroller Reference Manual, Rev. 3" says on
468 * pg. 30-10 that the chip supports a /32 and a /10 prescaler.
469 * Furthermore, it states that "After reset, the prescaler by 10
470 * for the UART mode is selected", but the reset register value is
471 * 0x0000 which means a /32 prescaler. This is wrong.
472 *
473 * In reality using /32 prescaler doesn't work, as it is not supported!
474 * Use /16 or /10 prescaler, see "MPC5121e Hardware Design Guide",
475 * Chapter 4.1 PSC in UART Mode.
476 * Calculate with a /16 prescaler here.
477 */
478
479 /* uartclk contains the ips freq */
480 baud = uart_get_baud_rate(port, new, old,
481 port->uartclk / (16 * 0xffff) + 1,
482 port->uartclk / 16);
483 divisor = (port->uartclk + 8 * baud) / (16 * baud);
484
485 /* enable the /16 prescaler and set the divisor */
486 mpc52xx_set_divisor(PSC(port), 0xdd00, divisor);
487 return baud;
John Rigby25ae3a02008-01-29 04:28:56 +1100488}
489
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700490/* Init PSC FIFO Controller */
491static int __init mpc512x_psc_fifoc_init(void)
492{
493 struct device_node *np;
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700494
495 np = of_find_compatible_node(NULL, NULL,
496 "fsl,mpc5121-psc-fifo");
497 if (!np) {
498 pr_err("%s: Can't find FIFOC node\n", __func__);
499 return -ENODEV;
500 }
501
502 psc_fifoc = of_iomap(np, 0);
503 if (!psc_fifoc) {
504 pr_err("%s: Can't map FIFOC\n", __func__);
Julia Lawall05f25ab2010-08-29 11:52:41 +0200505 of_node_put(np);
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700506 return -ENODEV;
507 }
508
509 psc_fifoc_irq = irq_of_parse_and_map(np, 0);
510 of_node_put(np);
Alan Coxd4e33fa2012-01-26 17:44:09 +0000511 if (psc_fifoc_irq == 0) {
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700512 pr_err("%s: Can't get FIFOC irq\n", __func__);
513 iounmap(psc_fifoc);
514 return -ENODEV;
515 }
516
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700517 return 0;
518}
519
520static void __exit mpc512x_psc_fifoc_uninit(void)
521{
522 iounmap(psc_fifoc);
523}
524
525/* 512x specific interrupt handler. The caller holds the port lock */
526static irqreturn_t mpc512x_psc_handle_irq(struct uart_port *port)
527{
528 unsigned long fifoc_int;
529 int psc_num;
530
531 /* Read pending PSC FIFOC interrupts */
532 fifoc_int = in_be32(&psc_fifoc->fifoc_int);
533
534 /* Check if it is an interrupt for this port */
535 psc_num = (port->mapbase & 0xf00) >> 8;
536 if (test_bit(psc_num, &fifoc_int) ||
537 test_bit(psc_num + 16, &fifoc_int))
538 return mpc5xxx_uart_process_int(port);
539
540 return IRQ_NONE;
541}
542
543static int mpc512x_psc_clock(struct uart_port *port, int enable)
544{
545 struct clk *psc_clk;
546 int psc_num;
547 char clk_name[10];
548
549 if (uart_console(port))
550 return 0;
551
552 psc_num = (port->mapbase & 0xf00) >> 8;
553 snprintf(clk_name, sizeof(clk_name), "psc%d_clk", psc_num);
554 psc_clk = clk_get(port->dev, clk_name);
555 if (IS_ERR(psc_clk)) {
556 dev_err(port->dev, "Failed to get PSC clock entry!\n");
557 return -ENODEV;
558 }
559
560 dev_dbg(port->dev, "%s %sable\n", clk_name, enable ? "en" : "dis");
561
562 if (enable)
563 clk_enable(psc_clk);
564 else
565 clk_disable(psc_clk);
566
567 return 0;
568}
569
570static void mpc512x_psc_get_irq(struct uart_port *port, struct device_node *np)
571{
572 port->irqflags = IRQF_SHARED;
573 port->irq = psc_fifoc_irq;
574}
575
John Rigby25ae3a02008-01-29 04:28:56 +1100576static struct psc_ops mpc512x_psc_ops = {
577 .fifo_init = mpc512x_psc_fifo_init,
578 .raw_rx_rdy = mpc512x_psc_raw_rx_rdy,
579 .raw_tx_rdy = mpc512x_psc_raw_tx_rdy,
580 .rx_rdy = mpc512x_psc_rx_rdy,
581 .tx_rdy = mpc512x_psc_tx_rdy,
582 .tx_empty = mpc512x_psc_tx_empty,
583 .stop_rx = mpc512x_psc_stop_rx,
584 .start_tx = mpc512x_psc_start_tx,
585 .stop_tx = mpc512x_psc_stop_tx,
586 .rx_clr_irq = mpc512x_psc_rx_clr_irq,
587 .tx_clr_irq = mpc512x_psc_tx_clr_irq,
588 .write_char = mpc512x_psc_write_char,
589 .read_char = mpc512x_psc_read_char,
590 .cw_disable_ints = mpc512x_psc_cw_disable_ints,
591 .cw_restore_ints = mpc512x_psc_cw_restore_ints,
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000592 .set_baudrate = mpc512x_psc_set_baudrate,
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700593 .clock = mpc512x_psc_clock,
594 .fifoc_init = mpc512x_psc_fifoc_init,
595 .fifoc_uninit = mpc512x_psc_fifoc_uninit,
596 .get_irq = mpc512x_psc_get_irq,
597 .handle_irq = mpc512x_psc_handle_irq,
John Rigby25ae3a02008-01-29 04:28:56 +1100598};
599#endif
600
Uwe Kleine-König76d28e42012-05-21 21:57:39 +0200601static const struct psc_ops *psc_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602
603/* ======================================================================== */
604/* UART operations */
605/* ======================================================================== */
606
Grant Likely9b9129e2006-11-27 14:21:01 -0700607static unsigned int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608mpc52xx_uart_tx_empty(struct uart_port *port)
609{
John Rigby599f0302008-01-29 04:28:55 +1100610 return psc_ops->tx_empty(port) ? TIOCSER_TEMT : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611}
612
Grant Likely9b9129e2006-11-27 14:21:01 -0700613static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614mpc52xx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
615{
Wolfram Sangaec739e2008-12-21 02:54:32 -0700616 if (mctrl & TIOCM_RTS)
617 out_8(&PSC(port)->op1, MPC52xx_PSC_OP_RTS);
618 else
619 out_8(&PSC(port)->op0, MPC52xx_PSC_OP_RTS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620}
621
Grant Likely9b9129e2006-11-27 14:21:01 -0700622static unsigned int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623mpc52xx_uart_get_mctrl(struct uart_port *port)
624{
Wolfram Sangaec739e2008-12-21 02:54:32 -0700625 unsigned int ret = TIOCM_DSR;
626 u8 status = in_8(&PSC(port)->mpc52xx_psc_ipcr);
627
628 if (!(status & MPC52xx_PSC_CTS))
629 ret |= TIOCM_CTS;
630 if (!(status & MPC52xx_PSC_DCD))
631 ret |= TIOCM_CAR;
632
633 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634}
635
Grant Likely9b9129e2006-11-27 14:21:01 -0700636static void
Russell Kingb129a8c2005-08-31 10:12:14 +0100637mpc52xx_uart_stop_tx(struct uart_port *port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638{
639 /* port->lock taken by caller */
John Rigby599f0302008-01-29 04:28:55 +1100640 psc_ops->stop_tx(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641}
642
Grant Likely9b9129e2006-11-27 14:21:01 -0700643static void
Russell Kingb129a8c2005-08-31 10:12:14 +0100644mpc52xx_uart_start_tx(struct uart_port *port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645{
646 /* port->lock taken by caller */
John Rigby599f0302008-01-29 04:28:55 +1100647 psc_ops->start_tx(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648}
649
Grant Likely9b9129e2006-11-27 14:21:01 -0700650static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651mpc52xx_uart_send_xchar(struct uart_port *port, char ch)
652{
653 unsigned long flags;
654 spin_lock_irqsave(&port->lock, flags);
Grant Likely9b9129e2006-11-27 14:21:01 -0700655
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 port->x_char = ch;
657 if (ch) {
658 /* Make sure tx interrupts are on */
659 /* Truly necessary ??? They should be anyway */
John Rigby599f0302008-01-29 04:28:55 +1100660 psc_ops->start_tx(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 }
Grant Likely9b9129e2006-11-27 14:21:01 -0700662
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 spin_unlock_irqrestore(&port->lock, flags);
664}
665
666static void
667mpc52xx_uart_stop_rx(struct uart_port *port)
668{
669 /* port->lock taken by caller */
John Rigby599f0302008-01-29 04:28:55 +1100670 psc_ops->stop_rx(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671}
672
673static void
674mpc52xx_uart_enable_ms(struct uart_port *port)
675{
Wolfram Sangaec739e2008-12-21 02:54:32 -0700676 struct mpc52xx_psc __iomem *psc = PSC(port);
677
678 /* clear D_*-bits by reading them */
679 in_8(&psc->mpc52xx_psc_ipcr);
680 /* enable CTS and DCD as IPC interrupts */
681 out_8(&psc->mpc52xx_psc_acr, MPC52xx_PSC_IEC_CTS | MPC52xx_PSC_IEC_DCD);
682
683 port->read_status_mask |= MPC52xx_PSC_IMR_IPC;
684 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685}
686
687static void
688mpc52xx_uart_break_ctl(struct uart_port *port, int ctl)
689{
690 unsigned long flags;
691 spin_lock_irqsave(&port->lock, flags);
692
John Rigby406b7d42008-01-17 08:37:25 +1100693 if (ctl == -1)
694 out_8(&PSC(port)->command, MPC52xx_PSC_START_BRK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 else
John Rigby406b7d42008-01-17 08:37:25 +1100696 out_8(&PSC(port)->command, MPC52xx_PSC_STOP_BRK);
Grant Likely9b9129e2006-11-27 14:21:01 -0700697
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 spin_unlock_irqrestore(&port->lock, flags);
699}
700
701static int
702mpc52xx_uart_startup(struct uart_port *port)
703{
704 struct mpc52xx_psc __iomem *psc = PSC(port);
705 int ret;
706
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700707 if (psc_ops->clock) {
708 ret = psc_ops->clock(port, 1);
709 if (ret)
710 return ret;
711 }
712
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 /* Request IRQ */
714 ret = request_irq(port->irq, mpc52xx_uart_int,
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700715 port->irqflags, "mpc52xx_psc_uart", port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 if (ret)
717 return ret;
718
719 /* Reset/activate the port, clear and enable interrupts */
John Rigby406b7d42008-01-17 08:37:25 +1100720 out_8(&psc->command, MPC52xx_PSC_RST_RX);
721 out_8(&psc->command, MPC52xx_PSC_RST_TX);
Grant Likely9b9129e2006-11-27 14:21:01 -0700722
John Rigby406b7d42008-01-17 08:37:25 +1100723 out_be32(&psc->sicr, 0); /* UART mode DCD ignored */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724
John Rigby599f0302008-01-29 04:28:55 +1100725 psc_ops->fifo_init(port);
Grant Likely9b9129e2006-11-27 14:21:01 -0700726
John Rigby406b7d42008-01-17 08:37:25 +1100727 out_8(&psc->command, MPC52xx_PSC_TX_ENABLE);
728 out_8(&psc->command, MPC52xx_PSC_RX_ENABLE);
Grant Likely9b9129e2006-11-27 14:21:01 -0700729
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 return 0;
731}
732
733static void
734mpc52xx_uart_shutdown(struct uart_port *port)
735{
736 struct mpc52xx_psc __iomem *psc = PSC(port);
Grant Likely9b9129e2006-11-27 14:21:01 -0700737
Grant Likelya3481192007-05-07 01:38:51 +1000738 /* Shut down the port. Leave TX active if on a console port */
John Rigby406b7d42008-01-17 08:37:25 +1100739 out_8(&psc->command, MPC52xx_PSC_RST_RX);
Grant Likelya3481192007-05-07 01:38:51 +1000740 if (!uart_console(port))
John Rigby406b7d42008-01-17 08:37:25 +1100741 out_8(&psc->command, MPC52xx_PSC_RST_TX);
Grant Likely9b9129e2006-11-27 14:21:01 -0700742
743 port->read_status_mask = 0;
John Rigby406b7d42008-01-17 08:37:25 +1100744 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700746 if (psc_ops->clock)
747 psc_ops->clock(port, 0);
748
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 /* Release interrupt */
750 free_irq(port->irq, port);
751}
752
Grant Likely9b9129e2006-11-27 14:21:01 -0700753static void
Alan Cox606d0992006-12-08 02:38:45 -0800754mpc52xx_uart_set_termios(struct uart_port *port, struct ktermios *new,
John Rigby406b7d42008-01-17 08:37:25 +1100755 struct ktermios *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756{
757 struct mpc52xx_psc __iomem *psc = PSC(port);
758 unsigned long flags;
759 unsigned char mr1, mr2;
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000760 unsigned int j;
761 unsigned int baud;
Grant Likely9b9129e2006-11-27 14:21:01 -0700762
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 /* Prepare what we're gonna write */
764 mr1 = 0;
Grant Likely9b9129e2006-11-27 14:21:01 -0700765
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 switch (new->c_cflag & CSIZE) {
John Rigby406b7d42008-01-17 08:37:25 +1100767 case CS5: mr1 |= MPC52xx_PSC_MODE_5_BITS;
768 break;
769 case CS6: mr1 |= MPC52xx_PSC_MODE_6_BITS;
770 break;
771 case CS7: mr1 |= MPC52xx_PSC_MODE_7_BITS;
772 break;
773 case CS8:
774 default: mr1 |= MPC52xx_PSC_MODE_8_BITS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 }
776
777 if (new->c_cflag & PARENB) {
Wolfram Sangd3dec962012-08-27 16:03:14 +0200778 if (new->c_cflag & CMSPAR)
779 mr1 |= MPC52xx_PSC_MODE_PARFORCE;
780
781 /* With CMSPAR, PARODD also means high parity (same as termios) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 mr1 |= (new->c_cflag & PARODD) ?
783 MPC52xx_PSC_MODE_PARODD : MPC52xx_PSC_MODE_PAREVEN;
Wolfram Sangd3dec962012-08-27 16:03:14 +0200784 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 mr1 |= MPC52xx_PSC_MODE_PARNONE;
Wolfram Sangd3dec962012-08-27 16:03:14 +0200786 }
Grant Likely9b9129e2006-11-27 14:21:01 -0700787
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788 mr2 = 0;
789
790 if (new->c_cflag & CSTOPB)
791 mr2 |= MPC52xx_PSC_MODE_TWO_STOP;
792 else
793 mr2 |= ((new->c_cflag & CSIZE) == CS5) ?
794 MPC52xx_PSC_MODE_ONE_STOP_5_BITS :
795 MPC52xx_PSC_MODE_ONE_STOP;
796
Wolfram Sangaec739e2008-12-21 02:54:32 -0700797 if (new->c_cflag & CRTSCTS) {
798 mr1 |= MPC52xx_PSC_MODE_RXRTS;
799 mr2 |= MPC52xx_PSC_MODE_TXCTS;
800 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 /* Get the lock */
803 spin_lock_irqsave(&port->lock, flags);
804
Nick Andrewc4f01242008-12-05 16:34:46 +0000805 /* Do our best to flush TX & RX, so we don't lose anything */
806 /* But we don't wait indefinitely ! */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 j = 5000000; /* Maximum wait */
808 /* FIXME Can't receive chars since set_termios might be called at early
809 * boot for the console, all stuff is not yet ready to receive at that
810 * time and that just makes the kernel oops */
811 /* while (j-- && mpc52xx_uart_int_rx_chars(port)); */
John Rigby599f0302008-01-29 04:28:55 +1100812 while (!mpc52xx_uart_tx_empty(port) && --j)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813 udelay(1);
814
815 if (!j)
John Rigby406b7d42008-01-17 08:37:25 +1100816 printk(KERN_ERR "mpc52xx_uart.c: "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 "Unable to flush RX & TX fifos in-time in set_termios."
John Rigby406b7d42008-01-17 08:37:25 +1100818 "Some chars may have been lost.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819
820 /* Reset the TX & RX */
John Rigby406b7d42008-01-17 08:37:25 +1100821 out_8(&psc->command, MPC52xx_PSC_RST_RX);
822 out_8(&psc->command, MPC52xx_PSC_RST_TX);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823
824 /* Send new mode settings */
John Rigby406b7d42008-01-17 08:37:25 +1100825 out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
826 out_8(&psc->mode, mr1);
827 out_8(&psc->mode, mr2);
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000828 baud = psc_ops->set_baudrate(port, new, old);
829
830 /* Update the per-port timeout */
831 uart_update_timeout(port, new->c_cflag, baud);
Grant Likely9b9129e2006-11-27 14:21:01 -0700832
Wolfram Sangaec739e2008-12-21 02:54:32 -0700833 if (UART_ENABLE_MS(port, new->c_cflag))
834 mpc52xx_uart_enable_ms(port);
835
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 /* Reenable TX & RX */
John Rigby406b7d42008-01-17 08:37:25 +1100837 out_8(&psc->command, MPC52xx_PSC_TX_ENABLE);
838 out_8(&psc->command, MPC52xx_PSC_RX_ENABLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839
840 /* We're all set, release the lock */
841 spin_unlock_irqrestore(&port->lock, flags);
842}
843
844static const char *
845mpc52xx_uart_type(struct uart_port *port)
846{
Wolfram Sange44dcb62010-11-12 19:47:47 +0100847 /*
848 * We keep using PORT_MPC52xx for historic reasons although it applies
849 * for MPC512x, too, but print "MPC5xxx" to not irritate users
850 */
851 return port->type == PORT_MPC52xx ? "MPC5xxx PSC" : NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852}
853
854static void
855mpc52xx_uart_release_port(struct uart_port *port)
856{
John Rigby406b7d42008-01-17 08:37:25 +1100857 /* remapped by us ? */
858 if (port->flags & UPF_IOREMAP) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 iounmap(port->membase);
860 port->membase = NULL;
861 }
862
Grant Likelyb9272df2006-11-27 14:21:02 -0700863 release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864}
865
866static int
867mpc52xx_uart_request_port(struct uart_port *port)
868{
Amol Ladbe618f52006-09-30 23:29:23 -0700869 int err;
870
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 if (port->flags & UPF_IOREMAP) /* Need to remap ? */
Grant Likelyb9272df2006-11-27 14:21:02 -0700872 port->membase = ioremap(port->mapbase,
John Rigby406b7d42008-01-17 08:37:25 +1100873 sizeof(struct mpc52xx_psc));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874
875 if (!port->membase)
876 return -EINVAL;
877
Grant Likelyb9272df2006-11-27 14:21:02 -0700878 err = request_mem_region(port->mapbase, sizeof(struct mpc52xx_psc),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879 "mpc52xx_psc_uart") != NULL ? 0 : -EBUSY;
Amol Ladbe618f52006-09-30 23:29:23 -0700880
881 if (err && (port->flags & UPF_IOREMAP)) {
882 iounmap(port->membase);
883 port->membase = NULL;
884 }
885
886 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887}
888
889static void
890mpc52xx_uart_config_port(struct uart_port *port, int flags)
891{
John Rigby406b7d42008-01-17 08:37:25 +1100892 if ((flags & UART_CONFIG_TYPE)
893 && (mpc52xx_uart_request_port(port) == 0))
894 port->type = PORT_MPC52xx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895}
896
897static int
898mpc52xx_uart_verify_port(struct uart_port *port, struct serial_struct *ser)
899{
John Rigby406b7d42008-01-17 08:37:25 +1100900 if (ser->type != PORT_UNKNOWN && ser->type != PORT_MPC52xx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 return -EINVAL;
902
John Rigby406b7d42008-01-17 08:37:25 +1100903 if ((ser->irq != port->irq) ||
Julia Lawallb7a82122009-10-15 09:58:28 -0600904 (ser->io_type != UPIO_MEM) ||
John Rigby406b7d42008-01-17 08:37:25 +1100905 (ser->baud_base != port->uartclk) ||
906 (ser->iomem_base != (void *)port->mapbase) ||
907 (ser->hub6 != 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 return -EINVAL;
909
910 return 0;
911}
912
913
914static struct uart_ops mpc52xx_uart_ops = {
915 .tx_empty = mpc52xx_uart_tx_empty,
916 .set_mctrl = mpc52xx_uart_set_mctrl,
917 .get_mctrl = mpc52xx_uart_get_mctrl,
918 .stop_tx = mpc52xx_uart_stop_tx,
919 .start_tx = mpc52xx_uart_start_tx,
920 .send_xchar = mpc52xx_uart_send_xchar,
921 .stop_rx = mpc52xx_uart_stop_rx,
922 .enable_ms = mpc52xx_uart_enable_ms,
923 .break_ctl = mpc52xx_uart_break_ctl,
924 .startup = mpc52xx_uart_startup,
925 .shutdown = mpc52xx_uart_shutdown,
926 .set_termios = mpc52xx_uart_set_termios,
927/* .pm = mpc52xx_uart_pm, Not supported yet */
928/* .set_wake = mpc52xx_uart_set_wake, Not supported yet */
929 .type = mpc52xx_uart_type,
930 .release_port = mpc52xx_uart_release_port,
931 .request_port = mpc52xx_uart_request_port,
932 .config_port = mpc52xx_uart_config_port,
933 .verify_port = mpc52xx_uart_verify_port
934};
935
Grant Likely9b9129e2006-11-27 14:21:01 -0700936
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937/* ======================================================================== */
938/* Interrupt handling */
939/* ======================================================================== */
Grant Likely9b9129e2006-11-27 14:21:01 -0700940
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941static inline int
David Howells7d12e782006-10-05 14:55:46 +0100942mpc52xx_uart_int_rx_chars(struct uart_port *port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943{
Alan Coxebd2c8f2009-09-19 13:13:28 -0700944 struct tty_struct *tty = port->state->port.tty;
Alan Cox33f0f882006-01-09 20:54:13 -0800945 unsigned char ch, flag;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946 unsigned short status;
947
948 /* While we can read, do so ! */
John Rigby599f0302008-01-29 04:28:55 +1100949 while (psc_ops->raw_rx_rdy(port)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950 /* Get the char */
John Rigby599f0302008-01-29 04:28:55 +1100951 ch = psc_ops->read_char(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952
953 /* Handle sysreq char */
954#ifdef SUPPORT_SYSRQ
David Howells7d12e782006-10-05 14:55:46 +0100955 if (uart_handle_sysrq_char(port, ch)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956 port->sysrq = 0;
957 continue;
958 }
959#endif
960
961 /* Store it */
Alan Cox33f0f882006-01-09 20:54:13 -0800962
963 flag = TTY_NORMAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 port->icount.rx++;
Grant Likely9b9129e2006-11-27 14:21:01 -0700965
John Rigby599f0302008-01-29 04:28:55 +1100966 status = in_be16(&PSC(port)->mpc52xx_psc_status);
967
John Rigby406b7d42008-01-17 08:37:25 +1100968 if (status & (MPC52xx_PSC_SR_PE |
969 MPC52xx_PSC_SR_FE |
970 MPC52xx_PSC_SR_RB)) {
Grant Likely9b9129e2006-11-27 14:21:01 -0700971
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 if (status & MPC52xx_PSC_SR_RB) {
Alan Cox33f0f882006-01-09 20:54:13 -0800973 flag = TTY_BREAK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974 uart_handle_break(port);
René Bürgelb6514982008-12-21 02:54:31 -0700975 port->icount.brk++;
976 } else if (status & MPC52xx_PSC_SR_PE) {
Alan Cox33f0f882006-01-09 20:54:13 -0800977 flag = TTY_PARITY;
René Bürgelb6514982008-12-21 02:54:31 -0700978 port->icount.parity++;
979 }
980 else if (status & MPC52xx_PSC_SR_FE) {
Alan Cox33f0f882006-01-09 20:54:13 -0800981 flag = TTY_FRAME;
René Bürgelb6514982008-12-21 02:54:31 -0700982 port->icount.frame++;
983 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984
985 /* Clear error condition */
John Rigby406b7d42008-01-17 08:37:25 +1100986 out_8(&PSC(port)->command, MPC52xx_PSC_RST_ERR_STAT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987
988 }
Alan Cox33f0f882006-01-09 20:54:13 -0800989 tty_insert_flip_char(tty, ch, flag);
990 if (status & MPC52xx_PSC_SR_OE) {
991 /*
992 * Overrun is special, since it's
993 * reported immediately, and doesn't
994 * affect the current character
995 */
996 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
René Bürgelb6514982008-12-21 02:54:31 -0700997 port->icount.overrun++;
Alan Cox33f0f882006-01-09 20:54:13 -0800998 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 }
1000
Andrew Liufbe543b2008-04-29 17:36:25 +10001001 spin_unlock(&port->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 tty_flip_buffer_push(tty);
Andrew Liufbe543b2008-04-29 17:36:25 +10001003 spin_lock(&port->lock);
Grant Likely9b9129e2006-11-27 14:21:01 -07001004
John Rigby599f0302008-01-29 04:28:55 +11001005 return psc_ops->raw_rx_rdy(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006}
1007
1008static inline int
1009mpc52xx_uart_int_tx_chars(struct uart_port *port)
1010{
Alan Coxebd2c8f2009-09-19 13:13:28 -07001011 struct circ_buf *xmit = &port->state->xmit;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012
1013 /* Process out of band chars */
1014 if (port->x_char) {
John Rigby599f0302008-01-29 04:28:55 +11001015 psc_ops->write_char(port, port->x_char);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 port->icount.tx++;
1017 port->x_char = 0;
1018 return 1;
1019 }
1020
1021 /* Nothing to do ? */
1022 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
Russell Kingb129a8c2005-08-31 10:12:14 +01001023 mpc52xx_uart_stop_tx(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 return 0;
1025 }
1026
1027 /* Send chars */
John Rigby599f0302008-01-29 04:28:55 +11001028 while (psc_ops->raw_tx_rdy(port)) {
1029 psc_ops->write_char(port, xmit->buf[xmit->tail]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
1031 port->icount.tx++;
1032 if (uart_circ_empty(xmit))
1033 break;
1034 }
1035
1036 /* Wake up */
1037 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
1038 uart_write_wakeup(port);
1039
1040 /* Maybe we're done after all */
1041 if (uart_circ_empty(xmit)) {
Russell Kingb129a8c2005-08-31 10:12:14 +01001042 mpc52xx_uart_stop_tx(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043 return 0;
1044 }
1045
1046 return 1;
1047}
1048
Grant Likely9b9129e2006-11-27 14:21:01 -07001049static irqreturn_t
Anatolij Gustschin6acc6832010-02-16 22:30:03 -07001050mpc5xxx_uart_process_int(struct uart_port *port)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 unsigned long pass = ISR_PASS_LIMIT;
1053 unsigned int keepgoing;
Wolfram Sangaec739e2008-12-21 02:54:32 -07001054 u8 status;
Grant Likely9b9129e2006-11-27 14:21:01 -07001055
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 /* While we have stuff to do, we continue */
1057 do {
1058 /* If we don't find anything to do, we stop */
Grant Likely9b9129e2006-11-27 14:21:01 -07001059 keepgoing = 0;
1060
John Rigby599f0302008-01-29 04:28:55 +11001061 psc_ops->rx_clr_irq(port);
1062 if (psc_ops->rx_rdy(port))
David Howells7d12e782006-10-05 14:55:46 +01001063 keepgoing |= mpc52xx_uart_int_rx_chars(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064
John Rigby599f0302008-01-29 04:28:55 +11001065 psc_ops->tx_clr_irq(port);
1066 if (psc_ops->tx_rdy(port))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067 keepgoing |= mpc52xx_uart_int_tx_chars(port);
Grant Likely9b9129e2006-11-27 14:21:01 -07001068
Wolfram Sangaec739e2008-12-21 02:54:32 -07001069 status = in_8(&PSC(port)->mpc52xx_psc_ipcr);
1070 if (status & MPC52xx_PSC_D_DCD)
1071 uart_handle_dcd_change(port, !(status & MPC52xx_PSC_DCD));
1072
1073 if (status & MPC52xx_PSC_D_CTS)
1074 uart_handle_cts_change(port, !(status & MPC52xx_PSC_CTS));
1075
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 /* Limit number of iteration */
John Rigby406b7d42008-01-17 08:37:25 +11001077 if (!(--pass))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078 keepgoing = 0;
1079
1080 } while (keepgoing);
Grant Likely9b9129e2006-11-27 14:21:01 -07001081
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 return IRQ_HANDLED;
1083}
1084
Anatolij Gustschin6acc6832010-02-16 22:30:03 -07001085static irqreturn_t
1086mpc52xx_uart_int(int irq, void *dev_id)
1087{
1088 struct uart_port *port = dev_id;
1089 irqreturn_t ret;
1090
1091 spin_lock(&port->lock);
1092
1093 ret = psc_ops->handle_irq(port);
1094
1095 spin_unlock(&port->lock);
1096
1097 return ret;
1098}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099
1100/* ======================================================================== */
1101/* Console ( if applicable ) */
1102/* ======================================================================== */
1103
1104#ifdef CONFIG_SERIAL_MPC52xx_CONSOLE
1105
1106static void __init
1107mpc52xx_console_get_options(struct uart_port *port,
John Rigby406b7d42008-01-17 08:37:25 +11001108 int *baud, int *parity, int *bits, int *flow)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109{
1110 struct mpc52xx_psc __iomem *psc = PSC(port);
1111 unsigned char mr1;
1112
Grant Likelyb9272df2006-11-27 14:21:02 -07001113 pr_debug("mpc52xx_console_get_options(port=%p)\n", port);
1114
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 /* Read the mode registers */
John Rigby406b7d42008-01-17 08:37:25 +11001116 out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117 mr1 = in_8(&psc->mode);
Grant Likely9b9129e2006-11-27 14:21:01 -07001118
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 /* CT{U,L}R are write-only ! */
Grant Likelyb9272df2006-11-27 14:21:02 -07001120 *baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121
1122 /* Parse them */
1123 switch (mr1 & MPC52xx_PSC_MODE_BITS_MASK) {
John Rigby406b7d42008-01-17 08:37:25 +11001124 case MPC52xx_PSC_MODE_5_BITS:
1125 *bits = 5;
1126 break;
1127 case MPC52xx_PSC_MODE_6_BITS:
1128 *bits = 6;
1129 break;
1130 case MPC52xx_PSC_MODE_7_BITS:
1131 *bits = 7;
1132 break;
1133 case MPC52xx_PSC_MODE_8_BITS:
1134 default:
1135 *bits = 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136 }
Grant Likely9b9129e2006-11-27 14:21:01 -07001137
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 if (mr1 & MPC52xx_PSC_MODE_PARNONE)
1139 *parity = 'n';
1140 else
1141 *parity = mr1 & MPC52xx_PSC_MODE_PARODD ? 'o' : 'e';
1142}
1143
Grant Likely9b9129e2006-11-27 14:21:01 -07001144static void
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145mpc52xx_console_write(struct console *co, const char *s, unsigned int count)
1146{
1147 struct uart_port *port = &mpc52xx_uart_ports[co->index];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 unsigned int i, j;
Grant Likely9b9129e2006-11-27 14:21:01 -07001149
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150 /* Disable interrupts */
John Rigby599f0302008-01-29 04:28:55 +11001151 psc_ops->cw_disable_ints(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152
1153 /* Wait the TX buffer to be empty */
Grant Likely9b9129e2006-11-27 14:21:01 -07001154 j = 5000000; /* Maximum wait */
John Rigby599f0302008-01-29 04:28:55 +11001155 while (!mpc52xx_uart_tx_empty(port) && --j)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156 udelay(1);
1157
1158 /* Write all the chars */
Russell Kingd3587882006-03-20 20:00:09 +00001159 for (i = 0; i < count; i++, s++) {
1160 /* Line return handling */
1161 if (*s == '\n')
John Rigby599f0302008-01-29 04:28:55 +11001162 psc_ops->write_char(port, '\r');
Grant Likely9b9129e2006-11-27 14:21:01 -07001163
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 /* Send the char */
John Rigby599f0302008-01-29 04:28:55 +11001165 psc_ops->write_char(port, *s);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167 /* Wait the TX buffer to be empty */
Grant Likely9b9129e2006-11-27 14:21:01 -07001168 j = 20000; /* Maximum wait */
John Rigby599f0302008-01-29 04:28:55 +11001169 while (!mpc52xx_uart_tx_empty(port) && --j)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 udelay(1);
1171 }
1172
1173 /* Restore interrupt state */
John Rigby599f0302008-01-29 04:28:55 +11001174 psc_ops->cw_restore_ints(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175}
1176
Grant Likelyb9272df2006-11-27 14:21:02 -07001177
1178static int __init
1179mpc52xx_console_setup(struct console *co, char *options)
1180{
1181 struct uart_port *port = &mpc52xx_uart_ports[co->index];
1182 struct device_node *np = mpc52xx_uart_nodes[co->index];
John Rigby599f0302008-01-29 04:28:55 +11001183 unsigned int uartclk;
Grant Likelyb9272df2006-11-27 14:21:02 -07001184 struct resource res;
1185 int ret;
1186
1187 int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
1188 int bits = 8;
1189 int parity = 'n';
1190 int flow = 'n';
1191
1192 pr_debug("mpc52xx_console_setup co=%p, co->index=%i, options=%s\n",
1193 co, co->index, options);
1194
Roel Kluinb898f4f2009-05-28 14:34:29 -07001195 if ((co->index < 0) || (co->index >= MPC52xx_PSC_MAXNUM)) {
Grant Likelyb9272df2006-11-27 14:21:02 -07001196 pr_debug("PSC%x out of range\n", co->index);
1197 return -EINVAL;
1198 }
1199
1200 if (!np) {
1201 pr_debug("PSC%x not found in device tree\n", co->index);
1202 return -EINVAL;
1203 }
1204
1205 pr_debug("Console on ttyPSC%x is %s\n",
John Rigby406b7d42008-01-17 08:37:25 +11001206 co->index, mpc52xx_uart_nodes[co->index]->full_name);
Grant Likelyb9272df2006-11-27 14:21:02 -07001207
1208 /* Fetch register locations */
John Rigby406b7d42008-01-17 08:37:25 +11001209 ret = of_address_to_resource(np, 0, &res);
1210 if (ret) {
Grant Likelyb9272df2006-11-27 14:21:02 -07001211 pr_debug("Could not get resources for PSC%x\n", co->index);
1212 return ret;
1213 }
1214
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +00001215 uartclk = mpc5xxx_get_bus_frequency(np);
John Rigby599f0302008-01-29 04:28:55 +11001216 if (uartclk == 0) {
1217 pr_debug("Could not find uart clock frequency!\n");
Grant Likelyb9272df2006-11-27 14:21:02 -07001218 return -EINVAL;
1219 }
1220
1221 /* Basic port init. Needed since we use some uart_??? func before
1222 * real init for early access */
1223 spin_lock_init(&port->lock);
John Rigby599f0302008-01-29 04:28:55 +11001224 port->uartclk = uartclk;
Grant Likelyb9272df2006-11-27 14:21:02 -07001225 port->ops = &mpc52xx_uart_ops;
1226 port->mapbase = res.start;
1227 port->membase = ioremap(res.start, sizeof(struct mpc52xx_psc));
1228 port->irq = irq_of_parse_and_map(np, 0);
1229
1230 if (port->membase == NULL)
1231 return -EINVAL;
1232
Grant Likely5dd80d52007-10-13 22:37:02 -06001233 pr_debug("mpc52xx-psc uart at %p, mapped to %p, irq=%x, freq=%i\n",
John Rigby406b7d42008-01-17 08:37:25 +11001234 (void *)port->mapbase, port->membase,
1235 port->irq, port->uartclk);
Grant Likelyb9272df2006-11-27 14:21:02 -07001236
1237 /* Setup the port parameters accoding to options */
1238 if (options)
1239 uart_parse_options(options, &baud, &parity, &bits, &flow);
1240 else
1241 mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow);
1242
1243 pr_debug("Setting console parameters: %i %i%c1 flow=%c\n",
John Rigby406b7d42008-01-17 08:37:25 +11001244 baud, bits, parity, flow);
Grant Likelyb9272df2006-11-27 14:21:02 -07001245
1246 return uart_set_options(port, co, baud, parity, bits, flow);
1247}
Grant Likelyb9272df2006-11-27 14:21:02 -07001248
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249
Sylvain Munaut2d8179c2006-01-06 00:11:31 -08001250static struct uart_driver mpc52xx_uart_driver;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251
1252static struct console mpc52xx_console = {
Sylvain Munautd62de3a2006-01-06 00:11:32 -08001253 .name = "ttyPSC",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254 .write = mpc52xx_console_write,
1255 .device = uart_console_device,
1256 .setup = mpc52xx_console_setup,
1257 .flags = CON_PRINTBUFFER,
John Rigby406b7d42008-01-17 08:37:25 +11001258 .index = -1, /* Specified on the cmdline (e.g. console=ttyPSC0) */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259 .data = &mpc52xx_uart_driver,
1260};
1261
Grant Likely9b9129e2006-11-27 14:21:01 -07001262
1263static int __init
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264mpc52xx_console_init(void)
1265{
Grant Likelyb9272df2006-11-27 14:21:02 -07001266 mpc52xx_uart_of_enumerate();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267 register_console(&mpc52xx_console);
1268 return 0;
1269}
1270
1271console_initcall(mpc52xx_console_init);
1272
1273#define MPC52xx_PSC_CONSOLE &mpc52xx_console
1274#else
1275#define MPC52xx_PSC_CONSOLE NULL
1276#endif
1277
1278
1279/* ======================================================================== */
1280/* UART Driver */
1281/* ======================================================================== */
1282
1283static struct uart_driver mpc52xx_uart_driver = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284 .driver_name = "mpc52xx_psc_uart",
Sylvain Munautd62de3a2006-01-06 00:11:32 -08001285 .dev_name = "ttyPSC",
Sylvain Munautd62de3a2006-01-06 00:11:32 -08001286 .major = SERIAL_PSC_MAJOR,
1287 .minor = SERIAL_PSC_MINOR,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288 .nr = MPC52xx_PSC_MAXNUM,
1289 .cons = MPC52xx_PSC_CONSOLE,
1290};
1291
Grant Likelyb9272df2006-11-27 14:21:02 -07001292/* ======================================================================== */
1293/* OF Platform Driver */
1294/* ======================================================================== */
1295
Grant Likely52b80482008-02-06 22:29:25 -07001296static struct of_device_id mpc52xx_uart_of_match[] = {
1297#ifdef CONFIG_PPC_MPC52xx
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +00001298 { .compatible = "fsl,mpc5200b-psc-uart", .data = &mpc5200b_psc_ops, },
Grant Likely52b80482008-02-06 22:29:25 -07001299 { .compatible = "fsl,mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
1300 /* binding used by old lite5200 device trees: */
1301 { .compatible = "mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
1302 /* binding used by efika: */
1303 { .compatible = "mpc5200-serial", .data = &mpc52xx_psc_ops, },
1304#endif
1305#ifdef CONFIG_PPC_MPC512x
1306 { .compatible = "fsl,mpc5121-psc-uart", .data = &mpc512x_psc_ops, },
Grant Likely52b80482008-02-06 22:29:25 -07001307#endif
Grant Likelybc775ea2008-04-29 06:40:37 -06001308 {},
Grant Likely52b80482008-02-06 22:29:25 -07001309};
1310
Bill Pemberton9671f092012-11-19 13:21:50 -05001311static int mpc52xx_uart_of_probe(struct platform_device *op)
Grant Likelyb9272df2006-11-27 14:21:02 -07001312{
1313 int idx = -1;
John Rigby599f0302008-01-29 04:28:55 +11001314 unsigned int uartclk;
Grant Likelyb9272df2006-11-27 14:21:02 -07001315 struct uart_port *port = NULL;
1316 struct resource res;
1317 int ret;
1318
Grant Likelyb9272df2006-11-27 14:21:02 -07001319 /* Check validity & presence */
1320 for (idx = 0; idx < MPC52xx_PSC_MAXNUM; idx++)
Grant Likely61c7a082010-04-13 16:12:29 -07001321 if (mpc52xx_uart_nodes[idx] == op->dev.of_node)
Grant Likelyb9272df2006-11-27 14:21:02 -07001322 break;
1323 if (idx >= MPC52xx_PSC_MAXNUM)
1324 return -EINVAL;
1325 pr_debug("Found %s assigned to ttyPSC%x\n",
John Rigby406b7d42008-01-17 08:37:25 +11001326 mpc52xx_uart_nodes[idx]->full_name, idx);
Grant Likelyb9272df2006-11-27 14:21:02 -07001327
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +00001328 /* set the uart clock to the input clock of the psc, the different
1329 * prescalers are taken into account in the set_baudrate() methods
1330 * of the respective chip */
1331 uartclk = mpc5xxx_get_bus_frequency(op->dev.of_node);
John Rigby599f0302008-01-29 04:28:55 +11001332 if (uartclk == 0) {
1333 dev_dbg(&op->dev, "Could not find uart clock frequency!\n");
Grant Likelyb9272df2006-11-27 14:21:02 -07001334 return -EINVAL;
1335 }
1336
1337 /* Init the port structure */
1338 port = &mpc52xx_uart_ports[idx];
1339
1340 spin_lock_init(&port->lock);
John Rigby599f0302008-01-29 04:28:55 +11001341 port->uartclk = uartclk;
Grant Likelyb9272df2006-11-27 14:21:02 -07001342 port->fifosize = 512;
1343 port->iotype = UPIO_MEM;
1344 port->flags = UPF_BOOT_AUTOCONF |
John Rigby406b7d42008-01-17 08:37:25 +11001345 (uart_console(port) ? 0 : UPF_IOREMAP);
Grant Likelyb9272df2006-11-27 14:21:02 -07001346 port->line = idx;
1347 port->ops = &mpc52xx_uart_ops;
1348 port->dev = &op->dev;
1349
1350 /* Search for IRQ and mapbase */
Grant Likely61c7a082010-04-13 16:12:29 -07001351 ret = of_address_to_resource(op->dev.of_node, 0, &res);
John Rigby406b7d42008-01-17 08:37:25 +11001352 if (ret)
Grant Likelyb9272df2006-11-27 14:21:02 -07001353 return ret;
1354
1355 port->mapbase = res.start;
Wolfram Sang418441d92008-12-21 02:54:32 -07001356 if (!port->mapbase) {
1357 dev_dbg(&op->dev, "Could not allocate resources for PSC\n");
1358 return -EINVAL;
1359 }
1360
Grant Likely61c7a082010-04-13 16:12:29 -07001361 psc_ops->get_irq(port, op->dev.of_node);
Alan Coxd4e33fa2012-01-26 17:44:09 +00001362 if (port->irq == 0) {
Wolfram Sang418441d92008-12-21 02:54:32 -07001363 dev_dbg(&op->dev, "Could not get irq\n");
1364 return -EINVAL;
1365 }
Grant Likelyb9272df2006-11-27 14:21:02 -07001366
Grant Likely5dd80d52007-10-13 22:37:02 -06001367 dev_dbg(&op->dev, "mpc52xx-psc uart at %p, irq=%x, freq=%i\n",
John Rigby406b7d42008-01-17 08:37:25 +11001368 (void *)port->mapbase, port->irq, port->uartclk);
Grant Likelyb9272df2006-11-27 14:21:02 -07001369
Grant Likelyb9272df2006-11-27 14:21:02 -07001370 /* Add the port to the uart sub-system */
1371 ret = uart_add_one_port(&mpc52xx_uart_driver, port);
Anatolij Gustschin6acc6832010-02-16 22:30:03 -07001372 if (ret)
Wolfram Sang418441d92008-12-21 02:54:32 -07001373 return ret;
Grant Likelyb9272df2006-11-27 14:21:02 -07001374
Wolfram Sang418441d92008-12-21 02:54:32 -07001375 dev_set_drvdata(&op->dev, (void *)port);
1376 return 0;
Grant Likelyb9272df2006-11-27 14:21:02 -07001377}
1378
1379static int
Grant Likely2dc11582010-08-06 09:25:50 -06001380mpc52xx_uart_of_remove(struct platform_device *op)
Grant Likelyb9272df2006-11-27 14:21:02 -07001381{
1382 struct uart_port *port = dev_get_drvdata(&op->dev);
1383 dev_set_drvdata(&op->dev, NULL);
1384
Anatolij Gustschin6acc6832010-02-16 22:30:03 -07001385 if (port)
Grant Likelyb9272df2006-11-27 14:21:02 -07001386 uart_remove_one_port(&mpc52xx_uart_driver, port);
1387
1388 return 0;
1389}
1390
1391#ifdef CONFIG_PM
1392static int
Grant Likely2dc11582010-08-06 09:25:50 -06001393mpc52xx_uart_of_suspend(struct platform_device *op, pm_message_t state)
Grant Likelyb9272df2006-11-27 14:21:02 -07001394{
1395 struct uart_port *port = (struct uart_port *) dev_get_drvdata(&op->dev);
1396
1397 if (port)
1398 uart_suspend_port(&mpc52xx_uart_driver, port);
1399
1400 return 0;
1401}
1402
1403static int
Grant Likely2dc11582010-08-06 09:25:50 -06001404mpc52xx_uart_of_resume(struct platform_device *op)
Grant Likelyb9272df2006-11-27 14:21:02 -07001405{
1406 struct uart_port *port = (struct uart_port *) dev_get_drvdata(&op->dev);
1407
1408 if (port)
1409 uart_resume_port(&mpc52xx_uart_driver, port);
1410
1411 return 0;
1412}
1413#endif
1414
1415static void
Grant Likely3b5ebf82009-02-03 12:30:25 -07001416mpc52xx_uart_of_assign(struct device_node *np)
Grant Likelyb9272df2006-11-27 14:21:02 -07001417{
Grant Likelyb9272df2006-11-27 14:21:02 -07001418 int i;
1419
Grant Likely3b5ebf82009-02-03 12:30:25 -07001420 /* Find the first free PSC number */
Grant Likelyb9272df2006-11-27 14:21:02 -07001421 for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
1422 if (mpc52xx_uart_nodes[i] == NULL) {
Grant Likely3b5ebf82009-02-03 12:30:25 -07001423 of_node_get(np);
1424 mpc52xx_uart_nodes[i] = np;
1425 return;
Grant Likelyb9272df2006-11-27 14:21:02 -07001426 }
1427 }
Grant Likelyb9272df2006-11-27 14:21:02 -07001428}
1429
1430static void
1431mpc52xx_uart_of_enumerate(void)
1432{
John Rigby406b7d42008-01-17 08:37:25 +11001433 static int enum_done;
Grant Likelyb9272df2006-11-27 14:21:02 -07001434 struct device_node *np;
John Rigby25ae3a02008-01-29 04:28:56 +11001435 const struct of_device_id *match;
Grant Likelyb9272df2006-11-27 14:21:02 -07001436 int i;
1437
1438 if (enum_done)
1439 return;
1440
Grant Likely3b5ebf82009-02-03 12:30:25 -07001441 /* Assign index to each PSC in device tree */
1442 for_each_matching_node(np, mpc52xx_uart_of_match) {
John Rigby25ae3a02008-01-29 04:28:56 +11001443 match = of_match_node(mpc52xx_uart_of_match, np);
John Rigby25ae3a02008-01-29 04:28:56 +11001444 psc_ops = match->data;
Grant Likely3b5ebf82009-02-03 12:30:25 -07001445 mpc52xx_uart_of_assign(np);
Grant Likelyb9272df2006-11-27 14:21:02 -07001446 }
1447
1448 enum_done = 1;
1449
1450 for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
1451 if (mpc52xx_uart_nodes[i])
1452 pr_debug("%s assigned to ttyPSC%x\n",
John Rigby406b7d42008-01-17 08:37:25 +11001453 mpc52xx_uart_nodes[i]->full_name, i);
Grant Likelyb9272df2006-11-27 14:21:02 -07001454 }
1455}
1456
1457MODULE_DEVICE_TABLE(of, mpc52xx_uart_of_match);
1458
Grant Likely793218d2011-02-22 21:10:26 -07001459static struct platform_driver mpc52xx_uart_of_driver = {
Grant Likelyb9272df2006-11-27 14:21:02 -07001460 .probe = mpc52xx_uart_of_probe,
1461 .remove = mpc52xx_uart_of_remove,
1462#ifdef CONFIG_PM
1463 .suspend = mpc52xx_uart_of_suspend,
1464 .resume = mpc52xx_uart_of_resume,
1465#endif
Grant Likely40182942010-04-13 16:13:02 -07001466 .driver = {
1467 .name = "mpc52xx-psc-uart",
1468 .owner = THIS_MODULE,
1469 .of_match_table = mpc52xx_uart_of_match,
Grant Likelyb9272df2006-11-27 14:21:02 -07001470 },
1471};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001472
1473
1474/* ======================================================================== */
1475/* Module */
1476/* ======================================================================== */
1477
1478static int __init
1479mpc52xx_uart_init(void)
1480{
1481 int ret;
1482
Grant Likelyb9272df2006-11-27 14:21:02 -07001483 printk(KERN_INFO "Serial: MPC52xx PSC UART driver\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001484
John Rigby406b7d42008-01-17 08:37:25 +11001485 ret = uart_register_driver(&mpc52xx_uart_driver);
1486 if (ret) {
Grant Likelyb9272df2006-11-27 14:21:02 -07001487 printk(KERN_ERR "%s: uart_register_driver failed (%i)\n",
1488 __FILE__, ret);
1489 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490 }
1491
Grant Likelyb9272df2006-11-27 14:21:02 -07001492 mpc52xx_uart_of_enumerate();
1493
Anatolij Gustschin6acc6832010-02-16 22:30:03 -07001494 /*
1495 * Map the PSC FIFO Controller and init if on MPC512x.
1496 */
Anatolij Gustschine6114fa2010-05-05 00:18:59 +02001497 if (psc_ops && psc_ops->fifoc_init) {
Anatolij Gustschin6acc6832010-02-16 22:30:03 -07001498 ret = psc_ops->fifoc_init();
1499 if (ret)
1500 return ret;
1501 }
1502
Grant Likely793218d2011-02-22 21:10:26 -07001503 ret = platform_driver_register(&mpc52xx_uart_of_driver);
Grant Likelyb9272df2006-11-27 14:21:02 -07001504 if (ret) {
Grant Likely793218d2011-02-22 21:10:26 -07001505 printk(KERN_ERR "%s: platform_driver_register failed (%i)\n",
Grant Likelyb9272df2006-11-27 14:21:02 -07001506 __FILE__, ret);
1507 uart_unregister_driver(&mpc52xx_uart_driver);
1508 return ret;
1509 }
Grant Likelyb9272df2006-11-27 14:21:02 -07001510
1511 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512}
1513
1514static void __exit
1515mpc52xx_uart_exit(void)
1516{
Anatolij Gustschin6acc6832010-02-16 22:30:03 -07001517 if (psc_ops->fifoc_uninit)
1518 psc_ops->fifoc_uninit();
1519
Grant Likely793218d2011-02-22 21:10:26 -07001520 platform_driver_unregister(&mpc52xx_uart_of_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521 uart_unregister_driver(&mpc52xx_uart_driver);
1522}
1523
1524
1525module_init(mpc52xx_uart_init);
1526module_exit(mpc52xx_uart_exit);
1527
1528MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
1529MODULE_DESCRIPTION("Freescale MPC52xx PSC UART");
1530MODULE_LICENSE("GPL");