blob: e1280a20b7a2f4c840e400039d79a40196ae7e5a [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>
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
John Rigby599f0302008-01-29 04:28:55 +110087/* ======================================================================== */
88/* PSC fifo operations for isolating differences between 52xx and 512x */
89/* ======================================================================== */
90
91struct psc_ops {
92 void (*fifo_init)(struct uart_port *port);
93 int (*raw_rx_rdy)(struct uart_port *port);
94 int (*raw_tx_rdy)(struct uart_port *port);
95 int (*rx_rdy)(struct uart_port *port);
96 int (*tx_rdy)(struct uart_port *port);
97 int (*tx_empty)(struct uart_port *port);
98 void (*stop_rx)(struct uart_port *port);
99 void (*start_tx)(struct uart_port *port);
100 void (*stop_tx)(struct uart_port *port);
101 void (*rx_clr_irq)(struct uart_port *port);
102 void (*tx_clr_irq)(struct uart_port *port);
103 void (*write_char)(struct uart_port *port, unsigned char c);
104 unsigned char (*read_char)(struct uart_port *port);
105 void (*cw_disable_ints)(struct uart_port *port);
106 void (*cw_restore_ints)(struct uart_port *port);
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000107 unsigned int (*set_baudrate)(struct uart_port *port,
108 struct ktermios *new,
109 struct ktermios *old);
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700110 int (*clock)(struct uart_port *port, int enable);
111 int (*fifoc_init)(void);
112 void (*fifoc_uninit)(void);
113 void (*get_irq)(struct uart_port *, struct device_node *);
114 irqreturn_t (*handle_irq)(struct uart_port *port);
Matteo Facchinetti2574b272013-05-24 20:24:58 +0200115 u16 (*get_status)(struct uart_port *port);
116 u8 (*get_ipcr)(struct uart_port *port);
117 void (*command)(struct uart_port *port, u8 cmd);
118 void (*set_mode)(struct uart_port *port, u8 mr1, u8 mr2);
119 void (*set_rts)(struct uart_port *port, int state);
120 void (*enable_ms)(struct uart_port *port);
121 void (*set_sicr)(struct uart_port *port, u32 val);
122 void (*set_imr)(struct uart_port *port, u16 val);
123 u8 (*get_mr1)(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
Matteo Facchinetti2574b272013-05-24 20:24:58 +0200136static u16 mpc52xx_psc_get_status(struct uart_port *port)
137{
138 return in_be16(&PSC(port)->mpc52xx_psc_status);
139}
140
141static u8 mpc52xx_psc_get_ipcr(struct uart_port *port)
142{
143 return in_8(&PSC(port)->mpc52xx_psc_ipcr);
144}
145
146static void mpc52xx_psc_command(struct uart_port *port, u8 cmd)
147{
148 out_8(&PSC(port)->command, cmd);
149}
150
151static void mpc52xx_psc_set_mode(struct uart_port *port, u8 mr1, u8 mr2)
152{
153 out_8(&PSC(port)->command, MPC52xx_PSC_SEL_MODE_REG_1);
154 out_8(&PSC(port)->mode, mr1);
155 out_8(&PSC(port)->mode, mr2);
156}
157
158static void mpc52xx_psc_set_rts(struct uart_port *port, int state)
159{
160 if (state)
161 out_8(&PSC(port)->op1, MPC52xx_PSC_OP_RTS);
162 else
163 out_8(&PSC(port)->op0, MPC52xx_PSC_OP_RTS);
164}
165
166static void mpc52xx_psc_enable_ms(struct uart_port *port)
167{
168 struct mpc52xx_psc __iomem *psc = PSC(port);
169
170 /* clear D_*-bits by reading them */
171 in_8(&psc->mpc52xx_psc_ipcr);
172 /* enable CTS and DCD as IPC interrupts */
173 out_8(&psc->mpc52xx_psc_acr, MPC52xx_PSC_IEC_CTS | MPC52xx_PSC_IEC_DCD);
174
175 port->read_status_mask |= MPC52xx_PSC_IMR_IPC;
176 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
177}
178
179static void mpc52xx_psc_set_sicr(struct uart_port *port, u32 val)
180{
181 out_be32(&PSC(port)->sicr, val);
182}
183
184static void mpc52xx_psc_set_imr(struct uart_port *port, u16 val)
185{
186 out_be16(&PSC(port)->mpc52xx_psc_imr, val);
187}
188
189static u8 mpc52xx_psc_get_mr1(struct uart_port *port)
190{
191 out_8(&PSC(port)->command, MPC52xx_PSC_SEL_MODE_REG_1);
192 return in_8(&PSC(port)->mode);
193}
194
John Rigby25ae3a02008-01-29 04:28:56 +1100195#ifdef CONFIG_PPC_MPC52xx
John Rigby599f0302008-01-29 04:28:55 +1100196#define FIFO_52xx(port) ((struct mpc52xx_psc_fifo __iomem *)(PSC(port)+1))
197static void mpc52xx_psc_fifo_init(struct uart_port *port)
198{
199 struct mpc52xx_psc __iomem *psc = PSC(port);
200 struct mpc52xx_psc_fifo __iomem *fifo = FIFO_52xx(port);
201
John Rigby599f0302008-01-29 04:28:55 +1100202 out_8(&fifo->rfcntl, 0x00);
203 out_be16(&fifo->rfalarm, 0x1ff);
204 out_8(&fifo->tfcntl, 0x07);
205 out_be16(&fifo->tfalarm, 0x80);
206
207 port->read_status_mask |= MPC52xx_PSC_IMR_RXRDY | MPC52xx_PSC_IMR_TXRDY;
208 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
209}
210
211static int mpc52xx_psc_raw_rx_rdy(struct uart_port *port)
212{
213 return in_be16(&PSC(port)->mpc52xx_psc_status)
214 & MPC52xx_PSC_SR_RXRDY;
215}
216
217static int mpc52xx_psc_raw_tx_rdy(struct uart_port *port)
218{
219 return in_be16(&PSC(port)->mpc52xx_psc_status)
220 & MPC52xx_PSC_SR_TXRDY;
221}
222
223
224static int mpc52xx_psc_rx_rdy(struct uart_port *port)
225{
226 return in_be16(&PSC(port)->mpc52xx_psc_isr)
227 & port->read_status_mask
228 & MPC52xx_PSC_IMR_RXRDY;
229}
230
231static int mpc52xx_psc_tx_rdy(struct uart_port *port)
232{
233 return in_be16(&PSC(port)->mpc52xx_psc_isr)
234 & port->read_status_mask
235 & MPC52xx_PSC_IMR_TXRDY;
236}
237
238static int mpc52xx_psc_tx_empty(struct uart_port *port)
239{
240 return in_be16(&PSC(port)->mpc52xx_psc_status)
241 & MPC52xx_PSC_SR_TXEMP;
242}
243
244static void mpc52xx_psc_start_tx(struct uart_port *port)
245{
246 port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY;
247 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
248}
249
250static void mpc52xx_psc_stop_tx(struct uart_port *port)
251{
252 port->read_status_mask &= ~MPC52xx_PSC_IMR_TXRDY;
253 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
254}
255
256static void mpc52xx_psc_stop_rx(struct uart_port *port)
257{
258 port->read_status_mask &= ~MPC52xx_PSC_IMR_RXRDY;
259 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
260}
261
262static void mpc52xx_psc_rx_clr_irq(struct uart_port *port)
263{
264}
265
266static void mpc52xx_psc_tx_clr_irq(struct uart_port *port)
267{
268}
269
270static void mpc52xx_psc_write_char(struct uart_port *port, unsigned char c)
271{
272 out_8(&PSC(port)->mpc52xx_psc_buffer_8, c);
273}
274
275static unsigned char mpc52xx_psc_read_char(struct uart_port *port)
276{
277 return in_8(&PSC(port)->mpc52xx_psc_buffer_8);
278}
279
280static void mpc52xx_psc_cw_disable_ints(struct uart_port *port)
281{
282 out_be16(&PSC(port)->mpc52xx_psc_imr, 0);
283}
284
285static void mpc52xx_psc_cw_restore_ints(struct uart_port *port)
286{
287 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
288}
289
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000290static unsigned int mpc5200_psc_set_baudrate(struct uart_port *port,
291 struct ktermios *new,
292 struct ktermios *old)
John Rigby599f0302008-01-29 04:28:55 +1100293{
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000294 unsigned int baud;
295 unsigned int divisor;
296
297 /* The 5200 has a fixed /32 prescaler, uartclk contains the ipb freq */
298 baud = uart_get_baud_rate(port, new, old,
299 port->uartclk / (32 * 0xffff) + 1,
300 port->uartclk / 32);
301 divisor = (port->uartclk + 16 * baud) / (32 * baud);
302
303 /* enable the /32 prescaler and set the divisor */
304 mpc52xx_set_divisor(PSC(port), 0xdd00, divisor);
305 return baud;
306}
307
308static unsigned int mpc5200b_psc_set_baudrate(struct uart_port *port,
309 struct ktermios *new,
310 struct ktermios *old)
311{
312 unsigned int baud;
313 unsigned int divisor;
314 u16 prescaler;
315
316 /* The 5200B has a selectable /4 or /32 prescaler, uartclk contains the
317 * ipb freq */
318 baud = uart_get_baud_rate(port, new, old,
319 port->uartclk / (32 * 0xffff) + 1,
320 port->uartclk / 4);
321 divisor = (port->uartclk + 2 * baud) / (4 * baud);
322
Frank Benkerte0955ac2012-03-05 16:14:29 +0100323 /* select the proper prescaler and set the divisor
324 * prefer high prescaler for more tolerance on low baudrates */
325 if (divisor > 0xffff || baud <= 115200) {
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000326 divisor = (divisor + 4) / 8;
327 prescaler = 0xdd00; /* /32 */
328 } else
329 prescaler = 0xff00; /* /4 */
330 mpc52xx_set_divisor(PSC(port), prescaler, divisor);
331 return baud;
John Rigby599f0302008-01-29 04:28:55 +1100332}
333
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700334static void mpc52xx_psc_get_irq(struct uart_port *port, struct device_node *np)
335{
Yong Zhang9cfb5c02011-09-22 16:59:15 +0800336 port->irqflags = 0;
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700337 port->irq = irq_of_parse_and_map(np, 0);
338}
339
340/* 52xx specific interrupt handler. The caller holds the port lock */
341static irqreturn_t mpc52xx_psc_handle_irq(struct uart_port *port)
342{
343 return mpc5xxx_uart_process_int(port);
344}
345
John Rigby599f0302008-01-29 04:28:55 +1100346static struct psc_ops mpc52xx_psc_ops = {
347 .fifo_init = mpc52xx_psc_fifo_init,
348 .raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
349 .raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
350 .rx_rdy = mpc52xx_psc_rx_rdy,
351 .tx_rdy = mpc52xx_psc_tx_rdy,
352 .tx_empty = mpc52xx_psc_tx_empty,
353 .stop_rx = mpc52xx_psc_stop_rx,
354 .start_tx = mpc52xx_psc_start_tx,
355 .stop_tx = mpc52xx_psc_stop_tx,
356 .rx_clr_irq = mpc52xx_psc_rx_clr_irq,
357 .tx_clr_irq = mpc52xx_psc_tx_clr_irq,
358 .write_char = mpc52xx_psc_write_char,
359 .read_char = mpc52xx_psc_read_char,
360 .cw_disable_ints = mpc52xx_psc_cw_disable_ints,
361 .cw_restore_ints = mpc52xx_psc_cw_restore_ints,
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000362 .set_baudrate = mpc5200_psc_set_baudrate,
363 .get_irq = mpc52xx_psc_get_irq,
364 .handle_irq = mpc52xx_psc_handle_irq,
Matteo Facchinetti2574b272013-05-24 20:24:58 +0200365 .get_status = mpc52xx_psc_get_status,
366 .get_ipcr = mpc52xx_psc_get_ipcr,
367 .command = mpc52xx_psc_command,
368 .set_mode = mpc52xx_psc_set_mode,
369 .set_rts = mpc52xx_psc_set_rts,
370 .enable_ms = mpc52xx_psc_enable_ms,
371 .set_sicr = mpc52xx_psc_set_sicr,
372 .set_imr = mpc52xx_psc_set_imr,
373 .get_mr1 = mpc52xx_psc_get_mr1,
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000374};
375
376static struct psc_ops mpc5200b_psc_ops = {
377 .fifo_init = mpc52xx_psc_fifo_init,
378 .raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
379 .raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
380 .rx_rdy = mpc52xx_psc_rx_rdy,
381 .tx_rdy = mpc52xx_psc_tx_rdy,
382 .tx_empty = mpc52xx_psc_tx_empty,
383 .stop_rx = mpc52xx_psc_stop_rx,
384 .start_tx = mpc52xx_psc_start_tx,
385 .stop_tx = mpc52xx_psc_stop_tx,
386 .rx_clr_irq = mpc52xx_psc_rx_clr_irq,
387 .tx_clr_irq = mpc52xx_psc_tx_clr_irq,
388 .write_char = mpc52xx_psc_write_char,
389 .read_char = mpc52xx_psc_read_char,
390 .cw_disable_ints = mpc52xx_psc_cw_disable_ints,
391 .cw_restore_ints = mpc52xx_psc_cw_restore_ints,
392 .set_baudrate = mpc5200b_psc_set_baudrate,
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700393 .get_irq = mpc52xx_psc_get_irq,
394 .handle_irq = mpc52xx_psc_handle_irq,
Matteo Facchinetti2574b272013-05-24 20:24:58 +0200395 .get_status = mpc52xx_psc_get_status,
396 .get_ipcr = mpc52xx_psc_get_ipcr,
397 .command = mpc52xx_psc_command,
398 .set_mode = mpc52xx_psc_set_mode,
399 .set_rts = mpc52xx_psc_set_rts,
400 .enable_ms = mpc52xx_psc_enable_ms,
401 .set_sicr = mpc52xx_psc_set_sicr,
402 .set_imr = mpc52xx_psc_set_imr,
403 .get_mr1 = mpc52xx_psc_get_mr1,
John Rigby599f0302008-01-29 04:28:55 +1100404};
405
John Rigby25ae3a02008-01-29 04:28:56 +1100406#endif /* CONFIG_MPC52xx */
407
408#ifdef CONFIG_PPC_MPC512x
409#define FIFO_512x(port) ((struct mpc512x_psc_fifo __iomem *)(PSC(port)+1))
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700410
411/* PSC FIFO Controller for mpc512x */
412struct psc_fifoc {
413 u32 fifoc_cmd;
414 u32 fifoc_int;
415 u32 fifoc_dma;
416 u32 fifoc_axe;
417 u32 fifoc_debug;
418};
419
420static struct psc_fifoc __iomem *psc_fifoc;
421static unsigned int psc_fifoc_irq;
422
John Rigby25ae3a02008-01-29 04:28:56 +1100423static void mpc512x_psc_fifo_init(struct uart_port *port)
424{
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700425 /* /32 prescaler */
426 out_be16(&PSC(port)->mpc52xx_psc_clock_select, 0xdd00);
427
John Rigby25ae3a02008-01-29 04:28:56 +1100428 out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_RESET_SLICE);
429 out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
430 out_be32(&FIFO_512x(port)->txalarm, 1);
431 out_be32(&FIFO_512x(port)->tximr, 0);
432
433 out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_RESET_SLICE);
434 out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
435 out_be32(&FIFO_512x(port)->rxalarm, 1);
436 out_be32(&FIFO_512x(port)->rximr, 0);
437
438 out_be32(&FIFO_512x(port)->tximr, MPC512x_PSC_FIFO_ALARM);
439 out_be32(&FIFO_512x(port)->rximr, MPC512x_PSC_FIFO_ALARM);
440}
441
442static int mpc512x_psc_raw_rx_rdy(struct uart_port *port)
443{
444 return !(in_be32(&FIFO_512x(port)->rxsr) & MPC512x_PSC_FIFO_EMPTY);
445}
446
447static int mpc512x_psc_raw_tx_rdy(struct uart_port *port)
448{
449 return !(in_be32(&FIFO_512x(port)->txsr) & MPC512x_PSC_FIFO_FULL);
450}
451
452static int mpc512x_psc_rx_rdy(struct uart_port *port)
453{
454 return in_be32(&FIFO_512x(port)->rxsr)
455 & in_be32(&FIFO_512x(port)->rximr)
456 & MPC512x_PSC_FIFO_ALARM;
457}
458
459static int mpc512x_psc_tx_rdy(struct uart_port *port)
460{
461 return in_be32(&FIFO_512x(port)->txsr)
462 & in_be32(&FIFO_512x(port)->tximr)
463 & MPC512x_PSC_FIFO_ALARM;
464}
465
466static int mpc512x_psc_tx_empty(struct uart_port *port)
467{
468 return in_be32(&FIFO_512x(port)->txsr)
469 & MPC512x_PSC_FIFO_EMPTY;
470}
471
472static void mpc512x_psc_stop_rx(struct uart_port *port)
473{
474 unsigned long rx_fifo_imr;
475
476 rx_fifo_imr = in_be32(&FIFO_512x(port)->rximr);
477 rx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
478 out_be32(&FIFO_512x(port)->rximr, rx_fifo_imr);
479}
480
481static void mpc512x_psc_start_tx(struct uart_port *port)
482{
483 unsigned long tx_fifo_imr;
484
485 tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
486 tx_fifo_imr |= MPC512x_PSC_FIFO_ALARM;
487 out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
488}
489
490static void mpc512x_psc_stop_tx(struct uart_port *port)
491{
492 unsigned long tx_fifo_imr;
493
494 tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
495 tx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
496 out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
497}
498
499static void mpc512x_psc_rx_clr_irq(struct uart_port *port)
500{
501 out_be32(&FIFO_512x(port)->rxisr, in_be32(&FIFO_512x(port)->rxisr));
502}
503
504static void mpc512x_psc_tx_clr_irq(struct uart_port *port)
505{
506 out_be32(&FIFO_512x(port)->txisr, in_be32(&FIFO_512x(port)->txisr));
507}
508
509static void mpc512x_psc_write_char(struct uart_port *port, unsigned char c)
510{
511 out_8(&FIFO_512x(port)->txdata_8, c);
512}
513
514static unsigned char mpc512x_psc_read_char(struct uart_port *port)
515{
516 return in_8(&FIFO_512x(port)->rxdata_8);
517}
518
519static void mpc512x_psc_cw_disable_ints(struct uart_port *port)
520{
521 port->read_status_mask =
522 in_be32(&FIFO_512x(port)->tximr) << 16 |
523 in_be32(&FIFO_512x(port)->rximr);
524 out_be32(&FIFO_512x(port)->tximr, 0);
525 out_be32(&FIFO_512x(port)->rximr, 0);
526}
527
528static void mpc512x_psc_cw_restore_ints(struct uart_port *port)
529{
530 out_be32(&FIFO_512x(port)->tximr,
531 (port->read_status_mask >> 16) & 0x7f);
532 out_be32(&FIFO_512x(port)->rximr, port->read_status_mask & 0x7f);
533}
534
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000535static unsigned int mpc512x_psc_set_baudrate(struct uart_port *port,
536 struct ktermios *new,
537 struct ktermios *old)
John Rigby25ae3a02008-01-29 04:28:56 +1100538{
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000539 unsigned int baud;
540 unsigned int divisor;
541
542 /*
543 * The "MPC5121e Microcontroller Reference Manual, Rev. 3" says on
544 * pg. 30-10 that the chip supports a /32 and a /10 prescaler.
545 * Furthermore, it states that "After reset, the prescaler by 10
546 * for the UART mode is selected", but the reset register value is
547 * 0x0000 which means a /32 prescaler. This is wrong.
548 *
549 * In reality using /32 prescaler doesn't work, as it is not supported!
550 * Use /16 or /10 prescaler, see "MPC5121e Hardware Design Guide",
551 * Chapter 4.1 PSC in UART Mode.
552 * Calculate with a /16 prescaler here.
553 */
554
555 /* uartclk contains the ips freq */
556 baud = uart_get_baud_rate(port, new, old,
557 port->uartclk / (16 * 0xffff) + 1,
558 port->uartclk / 16);
559 divisor = (port->uartclk + 8 * baud) / (16 * baud);
560
561 /* enable the /16 prescaler and set the divisor */
562 mpc52xx_set_divisor(PSC(port), 0xdd00, divisor);
563 return baud;
John Rigby25ae3a02008-01-29 04:28:56 +1100564}
565
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700566/* Init PSC FIFO Controller */
567static int __init mpc512x_psc_fifoc_init(void)
568{
569 struct device_node *np;
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700570
571 np = of_find_compatible_node(NULL, NULL,
572 "fsl,mpc5121-psc-fifo");
573 if (!np) {
574 pr_err("%s: Can't find FIFOC node\n", __func__);
575 return -ENODEV;
576 }
577
578 psc_fifoc = of_iomap(np, 0);
579 if (!psc_fifoc) {
580 pr_err("%s: Can't map FIFOC\n", __func__);
Julia Lawall05f25ab2010-08-29 11:52:41 +0200581 of_node_put(np);
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700582 return -ENODEV;
583 }
584
585 psc_fifoc_irq = irq_of_parse_and_map(np, 0);
586 of_node_put(np);
Alan Coxd4e33fa2012-01-26 17:44:09 +0000587 if (psc_fifoc_irq == 0) {
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700588 pr_err("%s: Can't get FIFOC irq\n", __func__);
589 iounmap(psc_fifoc);
590 return -ENODEV;
591 }
592
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700593 return 0;
594}
595
596static void __exit mpc512x_psc_fifoc_uninit(void)
597{
598 iounmap(psc_fifoc);
599}
600
601/* 512x specific interrupt handler. The caller holds the port lock */
602static irqreturn_t mpc512x_psc_handle_irq(struct uart_port *port)
603{
604 unsigned long fifoc_int;
605 int psc_num;
606
607 /* Read pending PSC FIFOC interrupts */
608 fifoc_int = in_be32(&psc_fifoc->fifoc_int);
609
610 /* Check if it is an interrupt for this port */
611 psc_num = (port->mapbase & 0xf00) >> 8;
612 if (test_bit(psc_num, &fifoc_int) ||
613 test_bit(psc_num + 16, &fifoc_int))
614 return mpc5xxx_uart_process_int(port);
615
616 return IRQ_NONE;
617}
618
619static int mpc512x_psc_clock(struct uart_port *port, int enable)
620{
621 struct clk *psc_clk;
622 int psc_num;
623 char clk_name[10];
624
625 if (uart_console(port))
626 return 0;
627
628 psc_num = (port->mapbase & 0xf00) >> 8;
Anatolij Gustschin09081e52013-03-09 12:43:54 +0100629 snprintf(clk_name, sizeof(clk_name), "psc%d_mclk", psc_num);
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700630 psc_clk = clk_get(port->dev, clk_name);
631 if (IS_ERR(psc_clk)) {
632 dev_err(port->dev, "Failed to get PSC clock entry!\n");
633 return -ENODEV;
634 }
635
636 dev_dbg(port->dev, "%s %sable\n", clk_name, enable ? "en" : "dis");
637
638 if (enable)
639 clk_enable(psc_clk);
640 else
641 clk_disable(psc_clk);
642
643 return 0;
644}
645
646static void mpc512x_psc_get_irq(struct uart_port *port, struct device_node *np)
647{
648 port->irqflags = IRQF_SHARED;
649 port->irq = psc_fifoc_irq;
650}
Matteo Facchinetti1f48c492013-05-24 20:24:59 +0200651#endif
652
653#ifdef CONFIG_PPC_MPC512x
654
655#define PSC_5125(port) ((struct mpc5125_psc __iomem *)((port)->membase))
656#define FIFO_5125(port) ((struct mpc512x_psc_fifo __iomem *)(PSC_5125(port)+1))
657
658static void mpc5125_psc_fifo_init(struct uart_port *port)
659{
660 /* /32 prescaler */
661 out_8(&PSC_5125(port)->mpc52xx_psc_clock_select, 0xdd);
662
663 out_be32(&FIFO_5125(port)->txcmd, MPC512x_PSC_FIFO_RESET_SLICE);
664 out_be32(&FIFO_5125(port)->txcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
665 out_be32(&FIFO_5125(port)->txalarm, 1);
666 out_be32(&FIFO_5125(port)->tximr, 0);
667
668 out_be32(&FIFO_5125(port)->rxcmd, MPC512x_PSC_FIFO_RESET_SLICE);
669 out_be32(&FIFO_5125(port)->rxcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
670 out_be32(&FIFO_5125(port)->rxalarm, 1);
671 out_be32(&FIFO_5125(port)->rximr, 0);
672
673 out_be32(&FIFO_5125(port)->tximr, MPC512x_PSC_FIFO_ALARM);
674 out_be32(&FIFO_5125(port)->rximr, MPC512x_PSC_FIFO_ALARM);
675}
676
677static int mpc5125_psc_raw_rx_rdy(struct uart_port *port)
678{
679 return !(in_be32(&FIFO_5125(port)->rxsr) & MPC512x_PSC_FIFO_EMPTY);
680}
681
682static int mpc5125_psc_raw_tx_rdy(struct uart_port *port)
683{
684 return !(in_be32(&FIFO_5125(port)->txsr) & MPC512x_PSC_FIFO_FULL);
685}
686
687static int mpc5125_psc_rx_rdy(struct uart_port *port)
688{
689 return in_be32(&FIFO_5125(port)->rxsr) &
690 in_be32(&FIFO_5125(port)->rximr) & MPC512x_PSC_FIFO_ALARM;
691}
692
693static int mpc5125_psc_tx_rdy(struct uart_port *port)
694{
695 return in_be32(&FIFO_5125(port)->txsr) &
696 in_be32(&FIFO_5125(port)->tximr) & MPC512x_PSC_FIFO_ALARM;
697}
698
699static int mpc5125_psc_tx_empty(struct uart_port *port)
700{
701 return in_be32(&FIFO_5125(port)->txsr) & MPC512x_PSC_FIFO_EMPTY;
702}
703
704static void mpc5125_psc_stop_rx(struct uart_port *port)
705{
706 unsigned long rx_fifo_imr;
707
708 rx_fifo_imr = in_be32(&FIFO_5125(port)->rximr);
709 rx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
710 out_be32(&FIFO_5125(port)->rximr, rx_fifo_imr);
711}
712
713static void mpc5125_psc_start_tx(struct uart_port *port)
714{
715 unsigned long tx_fifo_imr;
716
717 tx_fifo_imr = in_be32(&FIFO_5125(port)->tximr);
718 tx_fifo_imr |= MPC512x_PSC_FIFO_ALARM;
719 out_be32(&FIFO_5125(port)->tximr, tx_fifo_imr);
720}
721
722static void mpc5125_psc_stop_tx(struct uart_port *port)
723{
724 unsigned long tx_fifo_imr;
725
726 tx_fifo_imr = in_be32(&FIFO_5125(port)->tximr);
727 tx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
728 out_be32(&FIFO_5125(port)->tximr, tx_fifo_imr);
729}
730
731static void mpc5125_psc_rx_clr_irq(struct uart_port *port)
732{
733 out_be32(&FIFO_5125(port)->rxisr, in_be32(&FIFO_5125(port)->rxisr));
734}
735
736static void mpc5125_psc_tx_clr_irq(struct uart_port *port)
737{
738 out_be32(&FIFO_5125(port)->txisr, in_be32(&FIFO_5125(port)->txisr));
739}
740
741static void mpc5125_psc_write_char(struct uart_port *port, unsigned char c)
742{
743 out_8(&FIFO_5125(port)->txdata_8, c);
744}
745
746static unsigned char mpc5125_psc_read_char(struct uart_port *port)
747{
748 return in_8(&FIFO_5125(port)->rxdata_8);
749}
750
751static void mpc5125_psc_cw_disable_ints(struct uart_port *port)
752{
753 port->read_status_mask =
754 in_be32(&FIFO_5125(port)->tximr) << 16 |
755 in_be32(&FIFO_5125(port)->rximr);
756 out_be32(&FIFO_5125(port)->tximr, 0);
757 out_be32(&FIFO_5125(port)->rximr, 0);
758}
759
760static void mpc5125_psc_cw_restore_ints(struct uart_port *port)
761{
762 out_be32(&FIFO_5125(port)->tximr,
763 (port->read_status_mask >> 16) & 0x7f);
764 out_be32(&FIFO_5125(port)->rximr, port->read_status_mask & 0x7f);
765}
766
767static inline void mpc5125_set_divisor(struct mpc5125_psc __iomem *psc,
768 u8 prescaler, unsigned int divisor)
769{
770 /* select prescaler */
771 out_8(&psc->mpc52xx_psc_clock_select, prescaler);
772 out_8(&psc->ctur, divisor >> 8);
773 out_8(&psc->ctlr, divisor & 0xff);
774}
775
776static unsigned int mpc5125_psc_set_baudrate(struct uart_port *port,
777 struct ktermios *new,
778 struct ktermios *old)
779{
780 unsigned int baud;
781 unsigned int divisor;
782
783 /*
784 * Calculate with a /16 prescaler here.
785 */
786
787 /* uartclk contains the ips freq */
788 baud = uart_get_baud_rate(port, new, old,
789 port->uartclk / (16 * 0xffff) + 1,
790 port->uartclk / 16);
791 divisor = (port->uartclk + 8 * baud) / (16 * baud);
792
793 /* enable the /16 prescaler and set the divisor */
794 mpc5125_set_divisor(PSC_5125(port), 0xdd, divisor);
795 return baud;
796}
797
798/*
799 * MPC5125 have compatible PSC FIFO Controller.
800 * Special init not needed.
801 */
802static u16 mpc5125_psc_get_status(struct uart_port *port)
803{
804 return in_be16(&PSC_5125(port)->mpc52xx_psc_status);
805}
806
807static u8 mpc5125_psc_get_ipcr(struct uart_port *port)
808{
809 return in_8(&PSC_5125(port)->mpc52xx_psc_ipcr);
810}
811
812static void mpc5125_psc_command(struct uart_port *port, u8 cmd)
813{
814 out_8(&PSC_5125(port)->command, cmd);
815}
816
817static void mpc5125_psc_set_mode(struct uart_port *port, u8 mr1, u8 mr2)
818{
819 out_8(&PSC_5125(port)->mr1, mr1);
820 out_8(&PSC_5125(port)->mr2, mr2);
821}
822
823static void mpc5125_psc_set_rts(struct uart_port *port, int state)
824{
825 if (state & TIOCM_RTS)
826 out_8(&PSC_5125(port)->op1, MPC52xx_PSC_OP_RTS);
827 else
828 out_8(&PSC_5125(port)->op0, MPC52xx_PSC_OP_RTS);
829}
830
831static void mpc5125_psc_enable_ms(struct uart_port *port)
832{
833 struct mpc5125_psc __iomem *psc = PSC_5125(port);
834
835 /* clear D_*-bits by reading them */
836 in_8(&psc->mpc52xx_psc_ipcr);
837 /* enable CTS and DCD as IPC interrupts */
838 out_8(&psc->mpc52xx_psc_acr, MPC52xx_PSC_IEC_CTS | MPC52xx_PSC_IEC_DCD);
839
840 port->read_status_mask |= MPC52xx_PSC_IMR_IPC;
841 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
842}
843
844static void mpc5125_psc_set_sicr(struct uart_port *port, u32 val)
845{
846 out_be32(&PSC_5125(port)->sicr, val);
847}
848
849static void mpc5125_psc_set_imr(struct uart_port *port, u16 val)
850{
851 out_be16(&PSC_5125(port)->mpc52xx_psc_imr, val);
852}
853
854static u8 mpc5125_psc_get_mr1(struct uart_port *port)
855{
856 return in_8(&PSC_5125(port)->mr1);
857}
858
859static struct psc_ops mpc5125_psc_ops = {
860 .fifo_init = mpc5125_psc_fifo_init,
861 .raw_rx_rdy = mpc5125_psc_raw_rx_rdy,
862 .raw_tx_rdy = mpc5125_psc_raw_tx_rdy,
863 .rx_rdy = mpc5125_psc_rx_rdy,
864 .tx_rdy = mpc5125_psc_tx_rdy,
865 .tx_empty = mpc5125_psc_tx_empty,
866 .stop_rx = mpc5125_psc_stop_rx,
867 .start_tx = mpc5125_psc_start_tx,
868 .stop_tx = mpc5125_psc_stop_tx,
869 .rx_clr_irq = mpc5125_psc_rx_clr_irq,
870 .tx_clr_irq = mpc5125_psc_tx_clr_irq,
871 .write_char = mpc5125_psc_write_char,
872 .read_char = mpc5125_psc_read_char,
873 .cw_disable_ints = mpc5125_psc_cw_disable_ints,
874 .cw_restore_ints = mpc5125_psc_cw_restore_ints,
875 .set_baudrate = mpc5125_psc_set_baudrate,
876 .clock = mpc512x_psc_clock,
877 .fifoc_init = mpc512x_psc_fifoc_init,
878 .fifoc_uninit = mpc512x_psc_fifoc_uninit,
879 .get_irq = mpc512x_psc_get_irq,
880 .handle_irq = mpc512x_psc_handle_irq,
881 .get_status = mpc5125_psc_get_status,
882 .get_ipcr = mpc5125_psc_get_ipcr,
883 .command = mpc5125_psc_command,
884 .set_mode = mpc5125_psc_set_mode,
885 .set_rts = mpc5125_psc_set_rts,
886 .enable_ms = mpc5125_psc_enable_ms,
887 .set_sicr = mpc5125_psc_set_sicr,
888 .set_imr = mpc5125_psc_set_imr,
889 .get_mr1 = mpc5125_psc_get_mr1,
890};
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700891
John Rigby25ae3a02008-01-29 04:28:56 +1100892static struct psc_ops mpc512x_psc_ops = {
893 .fifo_init = mpc512x_psc_fifo_init,
894 .raw_rx_rdy = mpc512x_psc_raw_rx_rdy,
895 .raw_tx_rdy = mpc512x_psc_raw_tx_rdy,
896 .rx_rdy = mpc512x_psc_rx_rdy,
897 .tx_rdy = mpc512x_psc_tx_rdy,
898 .tx_empty = mpc512x_psc_tx_empty,
899 .stop_rx = mpc512x_psc_stop_rx,
900 .start_tx = mpc512x_psc_start_tx,
901 .stop_tx = mpc512x_psc_stop_tx,
902 .rx_clr_irq = mpc512x_psc_rx_clr_irq,
903 .tx_clr_irq = mpc512x_psc_tx_clr_irq,
904 .write_char = mpc512x_psc_write_char,
905 .read_char = mpc512x_psc_read_char,
906 .cw_disable_ints = mpc512x_psc_cw_disable_ints,
907 .cw_restore_ints = mpc512x_psc_cw_restore_ints,
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +0000908 .set_baudrate = mpc512x_psc_set_baudrate,
Anatolij Gustschin6acc6832010-02-16 22:30:03 -0700909 .clock = mpc512x_psc_clock,
910 .fifoc_init = mpc512x_psc_fifoc_init,
911 .fifoc_uninit = mpc512x_psc_fifoc_uninit,
912 .get_irq = mpc512x_psc_get_irq,
913 .handle_irq = mpc512x_psc_handle_irq,
Matteo Facchinetti2574b272013-05-24 20:24:58 +0200914 .get_status = mpc52xx_psc_get_status,
915 .get_ipcr = mpc52xx_psc_get_ipcr,
916 .command = mpc52xx_psc_command,
917 .set_mode = mpc52xx_psc_set_mode,
918 .set_rts = mpc52xx_psc_set_rts,
919 .enable_ms = mpc52xx_psc_enable_ms,
920 .set_sicr = mpc52xx_psc_set_sicr,
921 .set_imr = mpc52xx_psc_set_imr,
922 .get_mr1 = mpc52xx_psc_get_mr1,
John Rigby25ae3a02008-01-29 04:28:56 +1100923};
Matteo Facchinetti2574b272013-05-24 20:24:58 +0200924#endif /* CONFIG_PPC_MPC512x */
925
John Rigby25ae3a02008-01-29 04:28:56 +1100926
Uwe Kleine-König76d28e42012-05-21 21:57:39 +0200927static const struct psc_ops *psc_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928
929/* ======================================================================== */
930/* UART operations */
931/* ======================================================================== */
932
Grant Likely9b9129e2006-11-27 14:21:01 -0700933static unsigned int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934mpc52xx_uart_tx_empty(struct uart_port *port)
935{
John Rigby599f0302008-01-29 04:28:55 +1100936 return psc_ops->tx_empty(port) ? TIOCSER_TEMT : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937}
938
Grant Likely9b9129e2006-11-27 14:21:01 -0700939static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940mpc52xx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
941{
Matteo Facchinetti2574b272013-05-24 20:24:58 +0200942 psc_ops->set_rts(port, mctrl & TIOCM_RTS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943}
944
Grant Likely9b9129e2006-11-27 14:21:01 -0700945static unsigned int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946mpc52xx_uart_get_mctrl(struct uart_port *port)
947{
Wolfram Sangaec739e2008-12-21 02:54:32 -0700948 unsigned int ret = TIOCM_DSR;
Matteo Facchinetti2574b272013-05-24 20:24:58 +0200949 u8 status = psc_ops->get_ipcr(port);
Wolfram Sangaec739e2008-12-21 02:54:32 -0700950
951 if (!(status & MPC52xx_PSC_CTS))
952 ret |= TIOCM_CTS;
953 if (!(status & MPC52xx_PSC_DCD))
954 ret |= TIOCM_CAR;
955
956 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957}
958
Grant Likely9b9129e2006-11-27 14:21:01 -0700959static void
Russell Kingb129a8c2005-08-31 10:12:14 +0100960mpc52xx_uart_stop_tx(struct uart_port *port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961{
962 /* port->lock taken by caller */
John Rigby599f0302008-01-29 04:28:55 +1100963 psc_ops->stop_tx(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964}
965
Grant Likely9b9129e2006-11-27 14:21:01 -0700966static void
Russell Kingb129a8c2005-08-31 10:12:14 +0100967mpc52xx_uart_start_tx(struct uart_port *port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968{
969 /* port->lock taken by caller */
John Rigby599f0302008-01-29 04:28:55 +1100970 psc_ops->start_tx(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971}
972
Grant Likely9b9129e2006-11-27 14:21:01 -0700973static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974mpc52xx_uart_send_xchar(struct uart_port *port, char ch)
975{
976 unsigned long flags;
977 spin_lock_irqsave(&port->lock, flags);
Grant Likely9b9129e2006-11-27 14:21:01 -0700978
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 port->x_char = ch;
980 if (ch) {
981 /* Make sure tx interrupts are on */
982 /* Truly necessary ??? They should be anyway */
John Rigby599f0302008-01-29 04:28:55 +1100983 psc_ops->start_tx(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 }
Grant Likely9b9129e2006-11-27 14:21:01 -0700985
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986 spin_unlock_irqrestore(&port->lock, flags);
987}
988
989static void
990mpc52xx_uart_stop_rx(struct uart_port *port)
991{
992 /* port->lock taken by caller */
John Rigby599f0302008-01-29 04:28:55 +1100993 psc_ops->stop_rx(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994}
995
996static void
997mpc52xx_uart_enable_ms(struct uart_port *port)
998{
Matteo Facchinetti2574b272013-05-24 20:24:58 +0200999 psc_ops->enable_ms(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000}
1001
1002static void
1003mpc52xx_uart_break_ctl(struct uart_port *port, int ctl)
1004{
1005 unsigned long flags;
1006 spin_lock_irqsave(&port->lock, flags);
1007
John Rigby406b7d42008-01-17 08:37:25 +11001008 if (ctl == -1)
Matteo Facchinetti2574b272013-05-24 20:24:58 +02001009 psc_ops->command(port, MPC52xx_PSC_START_BRK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010 else
Matteo Facchinetti2574b272013-05-24 20:24:58 +02001011 psc_ops->command(port, MPC52xx_PSC_STOP_BRK);
Grant Likely9b9129e2006-11-27 14:21:01 -07001012
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 spin_unlock_irqrestore(&port->lock, flags);
1014}
1015
1016static int
1017mpc52xx_uart_startup(struct uart_port *port)
1018{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 int ret;
1020
Anatolij Gustschin6acc6832010-02-16 22:30:03 -07001021 if (psc_ops->clock) {
1022 ret = psc_ops->clock(port, 1);
1023 if (ret)
1024 return ret;
1025 }
1026
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027 /* Request IRQ */
1028 ret = request_irq(port->irq, mpc52xx_uart_int,
Anatolij Gustschin6acc6832010-02-16 22:30:03 -07001029 port->irqflags, "mpc52xx_psc_uart", port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030 if (ret)
1031 return ret;
1032
1033 /* Reset/activate the port, clear and enable interrupts */
Matteo Facchinetti2574b272013-05-24 20:24:58 +02001034 psc_ops->command(port, MPC52xx_PSC_RST_RX);
1035 psc_ops->command(port, MPC52xx_PSC_RST_TX);
Grant Likely9b9129e2006-11-27 14:21:01 -07001036
Matteo Facchinetti2574b272013-05-24 20:24:58 +02001037 psc_ops->set_sicr(port, 0); /* UART mode DCD ignored */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038
John Rigby599f0302008-01-29 04:28:55 +11001039 psc_ops->fifo_init(port);
Grant Likely9b9129e2006-11-27 14:21:01 -07001040
Matteo Facchinetti2574b272013-05-24 20:24:58 +02001041 psc_ops->command(port, MPC52xx_PSC_TX_ENABLE);
1042 psc_ops->command(port, MPC52xx_PSC_RX_ENABLE);
Grant Likely9b9129e2006-11-27 14:21:01 -07001043
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044 return 0;
1045}
1046
1047static void
1048mpc52xx_uart_shutdown(struct uart_port *port)
1049{
Grant Likelya3481192007-05-07 01:38:51 +10001050 /* Shut down the port. Leave TX active if on a console port */
Matteo Facchinetti2574b272013-05-24 20:24:58 +02001051 psc_ops->command(port, MPC52xx_PSC_RST_RX);
Grant Likelya3481192007-05-07 01:38:51 +10001052 if (!uart_console(port))
Matteo Facchinetti2574b272013-05-24 20:24:58 +02001053 psc_ops->command(port, MPC52xx_PSC_RST_TX);
Grant Likely9b9129e2006-11-27 14:21:01 -07001054
1055 port->read_status_mask = 0;
Matteo Facchinetti2574b272013-05-24 20:24:58 +02001056 psc_ops->set_imr(port, port->read_status_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057
Anatolij Gustschin6acc6832010-02-16 22:30:03 -07001058 if (psc_ops->clock)
1059 psc_ops->clock(port, 0);
1060
Matteo Facchinetti8a29dfb2013-06-12 09:21:42 +02001061 /* Disable interrupt */
1062 psc_ops->cw_disable_ints(port);
1063
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 /* Release interrupt */
1065 free_irq(port->irq, port);
1066}
1067
Grant Likely9b9129e2006-11-27 14:21:01 -07001068static void
Alan Cox606d0992006-12-08 02:38:45 -08001069mpc52xx_uart_set_termios(struct uart_port *port, struct ktermios *new,
John Rigby406b7d42008-01-17 08:37:25 +11001070 struct ktermios *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072 unsigned long flags;
1073 unsigned char mr1, mr2;
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +00001074 unsigned int j;
1075 unsigned int baud;
Grant Likely9b9129e2006-11-27 14:21:01 -07001076
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 /* Prepare what we're gonna write */
1078 mr1 = 0;
Grant Likely9b9129e2006-11-27 14:21:01 -07001079
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080 switch (new->c_cflag & CSIZE) {
John Rigby406b7d42008-01-17 08:37:25 +11001081 case CS5: mr1 |= MPC52xx_PSC_MODE_5_BITS;
1082 break;
1083 case CS6: mr1 |= MPC52xx_PSC_MODE_6_BITS;
1084 break;
1085 case CS7: mr1 |= MPC52xx_PSC_MODE_7_BITS;
1086 break;
1087 case CS8:
1088 default: mr1 |= MPC52xx_PSC_MODE_8_BITS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 }
1090
1091 if (new->c_cflag & PARENB) {
Wolfram Sangd3dec962012-08-27 16:03:14 +02001092 if (new->c_cflag & CMSPAR)
1093 mr1 |= MPC52xx_PSC_MODE_PARFORCE;
1094
1095 /* With CMSPAR, PARODD also means high parity (same as termios) */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096 mr1 |= (new->c_cflag & PARODD) ?
1097 MPC52xx_PSC_MODE_PARODD : MPC52xx_PSC_MODE_PAREVEN;
Wolfram Sangd3dec962012-08-27 16:03:14 +02001098 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099 mr1 |= MPC52xx_PSC_MODE_PARNONE;
Wolfram Sangd3dec962012-08-27 16:03:14 +02001100 }
Grant Likely9b9129e2006-11-27 14:21:01 -07001101
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102 mr2 = 0;
1103
1104 if (new->c_cflag & CSTOPB)
1105 mr2 |= MPC52xx_PSC_MODE_TWO_STOP;
1106 else
1107 mr2 |= ((new->c_cflag & CSIZE) == CS5) ?
1108 MPC52xx_PSC_MODE_ONE_STOP_5_BITS :
1109 MPC52xx_PSC_MODE_ONE_STOP;
1110
Wolfram Sangaec739e2008-12-21 02:54:32 -07001111 if (new->c_cflag & CRTSCTS) {
1112 mr1 |= MPC52xx_PSC_MODE_RXRTS;
1113 mr2 |= MPC52xx_PSC_MODE_TXCTS;
1114 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116 /* Get the lock */
1117 spin_lock_irqsave(&port->lock, flags);
1118
Nick Andrewc4f01242008-12-05 16:34:46 +00001119 /* Do our best to flush TX & RX, so we don't lose anything */
1120 /* But we don't wait indefinitely ! */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121 j = 5000000; /* Maximum wait */
1122 /* FIXME Can't receive chars since set_termios might be called at early
1123 * boot for the console, all stuff is not yet ready to receive at that
1124 * time and that just makes the kernel oops */
1125 /* while (j-- && mpc52xx_uart_int_rx_chars(port)); */
John Rigby599f0302008-01-29 04:28:55 +11001126 while (!mpc52xx_uart_tx_empty(port) && --j)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127 udelay(1);
1128
1129 if (!j)
John Rigby406b7d42008-01-17 08:37:25 +11001130 printk(KERN_ERR "mpc52xx_uart.c: "
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131 "Unable to flush RX & TX fifos in-time in set_termios."
John Rigby406b7d42008-01-17 08:37:25 +11001132 "Some chars may have been lost.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133
1134 /* Reset the TX & RX */
Matteo Facchinetti2574b272013-05-24 20:24:58 +02001135 psc_ops->command(port, MPC52xx_PSC_RST_RX);
1136 psc_ops->command(port, MPC52xx_PSC_RST_TX);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137
1138 /* Send new mode settings */
Matteo Facchinetti2574b272013-05-24 20:24:58 +02001139 psc_ops->set_mode(port, mr1, mr2);
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +00001140 baud = psc_ops->set_baudrate(port, new, old);
1141
1142 /* Update the per-port timeout */
1143 uart_update_timeout(port, new->c_cflag, baud);
Grant Likely9b9129e2006-11-27 14:21:01 -07001144
Wolfram Sangaec739e2008-12-21 02:54:32 -07001145 if (UART_ENABLE_MS(port, new->c_cflag))
1146 mpc52xx_uart_enable_ms(port);
1147
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 /* Reenable TX & RX */
Matteo Facchinetti2574b272013-05-24 20:24:58 +02001149 psc_ops->command(port, MPC52xx_PSC_TX_ENABLE);
1150 psc_ops->command(port, MPC52xx_PSC_RX_ENABLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151
1152 /* We're all set, release the lock */
1153 spin_unlock_irqrestore(&port->lock, flags);
1154}
1155
1156static const char *
1157mpc52xx_uart_type(struct uart_port *port)
1158{
Wolfram Sange44dcb62010-11-12 19:47:47 +01001159 /*
1160 * We keep using PORT_MPC52xx for historic reasons although it applies
1161 * for MPC512x, too, but print "MPC5xxx" to not irritate users
1162 */
1163 return port->type == PORT_MPC52xx ? "MPC5xxx PSC" : NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164}
1165
1166static void
1167mpc52xx_uart_release_port(struct uart_port *port)
1168{
John Rigby406b7d42008-01-17 08:37:25 +11001169 /* remapped by us ? */
1170 if (port->flags & UPF_IOREMAP) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 iounmap(port->membase);
1172 port->membase = NULL;
1173 }
1174
Grant Likelyb9272df2006-11-27 14:21:02 -07001175 release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176}
1177
1178static int
1179mpc52xx_uart_request_port(struct uart_port *port)
1180{
Amol Ladbe618f52006-09-30 23:29:23 -07001181 int err;
1182
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 if (port->flags & UPF_IOREMAP) /* Need to remap ? */
Grant Likelyb9272df2006-11-27 14:21:02 -07001184 port->membase = ioremap(port->mapbase,
John Rigby406b7d42008-01-17 08:37:25 +11001185 sizeof(struct mpc52xx_psc));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186
1187 if (!port->membase)
1188 return -EINVAL;
1189
Grant Likelyb9272df2006-11-27 14:21:02 -07001190 err = request_mem_region(port->mapbase, sizeof(struct mpc52xx_psc),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 "mpc52xx_psc_uart") != NULL ? 0 : -EBUSY;
Amol Ladbe618f52006-09-30 23:29:23 -07001192
1193 if (err && (port->flags & UPF_IOREMAP)) {
1194 iounmap(port->membase);
1195 port->membase = NULL;
1196 }
1197
1198 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199}
1200
1201static void
1202mpc52xx_uart_config_port(struct uart_port *port, int flags)
1203{
John Rigby406b7d42008-01-17 08:37:25 +11001204 if ((flags & UART_CONFIG_TYPE)
1205 && (mpc52xx_uart_request_port(port) == 0))
1206 port->type = PORT_MPC52xx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207}
1208
1209static int
1210mpc52xx_uart_verify_port(struct uart_port *port, struct serial_struct *ser)
1211{
John Rigby406b7d42008-01-17 08:37:25 +11001212 if (ser->type != PORT_UNKNOWN && ser->type != PORT_MPC52xx)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 return -EINVAL;
1214
John Rigby406b7d42008-01-17 08:37:25 +11001215 if ((ser->irq != port->irq) ||
Julia Lawallb7a82122009-10-15 09:58:28 -06001216 (ser->io_type != UPIO_MEM) ||
John Rigby406b7d42008-01-17 08:37:25 +11001217 (ser->baud_base != port->uartclk) ||
1218 (ser->iomem_base != (void *)port->mapbase) ||
1219 (ser->hub6 != 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220 return -EINVAL;
1221
1222 return 0;
1223}
1224
1225
1226static struct uart_ops mpc52xx_uart_ops = {
1227 .tx_empty = mpc52xx_uart_tx_empty,
1228 .set_mctrl = mpc52xx_uart_set_mctrl,
1229 .get_mctrl = mpc52xx_uart_get_mctrl,
1230 .stop_tx = mpc52xx_uart_stop_tx,
1231 .start_tx = mpc52xx_uart_start_tx,
1232 .send_xchar = mpc52xx_uart_send_xchar,
1233 .stop_rx = mpc52xx_uart_stop_rx,
1234 .enable_ms = mpc52xx_uart_enable_ms,
1235 .break_ctl = mpc52xx_uart_break_ctl,
1236 .startup = mpc52xx_uart_startup,
1237 .shutdown = mpc52xx_uart_shutdown,
1238 .set_termios = mpc52xx_uart_set_termios,
1239/* .pm = mpc52xx_uart_pm, Not supported yet */
1240/* .set_wake = mpc52xx_uart_set_wake, Not supported yet */
1241 .type = mpc52xx_uart_type,
1242 .release_port = mpc52xx_uart_release_port,
1243 .request_port = mpc52xx_uart_request_port,
1244 .config_port = mpc52xx_uart_config_port,
1245 .verify_port = mpc52xx_uart_verify_port
1246};
1247
Grant Likely9b9129e2006-11-27 14:21:01 -07001248
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249/* ======================================================================== */
1250/* Interrupt handling */
1251/* ======================================================================== */
Grant Likely9b9129e2006-11-27 14:21:01 -07001252
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253static inline int
David Howells7d12e782006-10-05 14:55:46 +01001254mpc52xx_uart_int_rx_chars(struct uart_port *port)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255{
Jiri Slaby92a19f92013-01-03 15:53:03 +01001256 struct tty_port *tport = &port->state->port;
Alan Cox33f0f882006-01-09 20:54:13 -08001257 unsigned char ch, flag;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258 unsigned short status;
1259
1260 /* While we can read, do so ! */
John Rigby599f0302008-01-29 04:28:55 +11001261 while (psc_ops->raw_rx_rdy(port)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 /* Get the char */
John Rigby599f0302008-01-29 04:28:55 +11001263 ch = psc_ops->read_char(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264
1265 /* Handle sysreq char */
1266#ifdef SUPPORT_SYSRQ
David Howells7d12e782006-10-05 14:55:46 +01001267 if (uart_handle_sysrq_char(port, ch)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268 port->sysrq = 0;
1269 continue;
1270 }
1271#endif
1272
1273 /* Store it */
Alan Cox33f0f882006-01-09 20:54:13 -08001274
1275 flag = TTY_NORMAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276 port->icount.rx++;
Grant Likely9b9129e2006-11-27 14:21:01 -07001277
Matteo Facchinetti2574b272013-05-24 20:24:58 +02001278 status = psc_ops->get_status(port);
John Rigby599f0302008-01-29 04:28:55 +11001279
John Rigby406b7d42008-01-17 08:37:25 +11001280 if (status & (MPC52xx_PSC_SR_PE |
1281 MPC52xx_PSC_SR_FE |
1282 MPC52xx_PSC_SR_RB)) {
Grant Likely9b9129e2006-11-27 14:21:01 -07001283
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284 if (status & MPC52xx_PSC_SR_RB) {
Alan Cox33f0f882006-01-09 20:54:13 -08001285 flag = TTY_BREAK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286 uart_handle_break(port);
René Bürgelb6514982008-12-21 02:54:31 -07001287 port->icount.brk++;
1288 } else if (status & MPC52xx_PSC_SR_PE) {
Alan Cox33f0f882006-01-09 20:54:13 -08001289 flag = TTY_PARITY;
René Bürgelb6514982008-12-21 02:54:31 -07001290 port->icount.parity++;
1291 }
1292 else if (status & MPC52xx_PSC_SR_FE) {
Alan Cox33f0f882006-01-09 20:54:13 -08001293 flag = TTY_FRAME;
René Bürgelb6514982008-12-21 02:54:31 -07001294 port->icount.frame++;
1295 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296
1297 /* Clear error condition */
Matteo Facchinetti2574b272013-05-24 20:24:58 +02001298 psc_ops->command(port, MPC52xx_PSC_RST_ERR_STAT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299
1300 }
Jiri Slaby92a19f92013-01-03 15:53:03 +01001301 tty_insert_flip_char(tport, ch, flag);
Alan Cox33f0f882006-01-09 20:54:13 -08001302 if (status & MPC52xx_PSC_SR_OE) {
1303 /*
1304 * Overrun is special, since it's
1305 * reported immediately, and doesn't
1306 * affect the current character
1307 */
Jiri Slaby92a19f92013-01-03 15:53:03 +01001308 tty_insert_flip_char(tport, 0, TTY_OVERRUN);
René Bürgelb6514982008-12-21 02:54:31 -07001309 port->icount.overrun++;
Alan Cox33f0f882006-01-09 20:54:13 -08001310 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311 }
1312
Andrew Liufbe543b2008-04-29 17:36:25 +10001313 spin_unlock(&port->lock);
Jiri Slaby2e124b42013-01-03 15:53:06 +01001314 tty_flip_buffer_push(tport);
Andrew Liufbe543b2008-04-29 17:36:25 +10001315 spin_lock(&port->lock);
Grant Likely9b9129e2006-11-27 14:21:01 -07001316
John Rigby599f0302008-01-29 04:28:55 +11001317 return psc_ops->raw_rx_rdy(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318}
1319
1320static inline int
1321mpc52xx_uart_int_tx_chars(struct uart_port *port)
1322{
Alan Coxebd2c8f2009-09-19 13:13:28 -07001323 struct circ_buf *xmit = &port->state->xmit;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324
1325 /* Process out of band chars */
1326 if (port->x_char) {
John Rigby599f0302008-01-29 04:28:55 +11001327 psc_ops->write_char(port, port->x_char);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328 port->icount.tx++;
1329 port->x_char = 0;
1330 return 1;
1331 }
1332
1333 /* Nothing to do ? */
1334 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
Russell Kingb129a8c2005-08-31 10:12:14 +01001335 mpc52xx_uart_stop_tx(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336 return 0;
1337 }
1338
1339 /* Send chars */
John Rigby599f0302008-01-29 04:28:55 +11001340 while (psc_ops->raw_tx_rdy(port)) {
1341 psc_ops->write_char(port, xmit->buf[xmit->tail]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
1343 port->icount.tx++;
1344 if (uart_circ_empty(xmit))
1345 break;
1346 }
1347
1348 /* Wake up */
1349 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
1350 uart_write_wakeup(port);
1351
1352 /* Maybe we're done after all */
1353 if (uart_circ_empty(xmit)) {
Russell Kingb129a8c2005-08-31 10:12:14 +01001354 mpc52xx_uart_stop_tx(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355 return 0;
1356 }
1357
1358 return 1;
1359}
1360
Grant Likely9b9129e2006-11-27 14:21:01 -07001361static irqreturn_t
Anatolij Gustschin6acc6832010-02-16 22:30:03 -07001362mpc5xxx_uart_process_int(struct uart_port *port)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364 unsigned long pass = ISR_PASS_LIMIT;
1365 unsigned int keepgoing;
Wolfram Sangaec739e2008-12-21 02:54:32 -07001366 u8 status;
Grant Likely9b9129e2006-11-27 14:21:01 -07001367
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368 /* While we have stuff to do, we continue */
1369 do {
1370 /* If we don't find anything to do, we stop */
Grant Likely9b9129e2006-11-27 14:21:01 -07001371 keepgoing = 0;
1372
John Rigby599f0302008-01-29 04:28:55 +11001373 psc_ops->rx_clr_irq(port);
1374 if (psc_ops->rx_rdy(port))
David Howells7d12e782006-10-05 14:55:46 +01001375 keepgoing |= mpc52xx_uart_int_rx_chars(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376
John Rigby599f0302008-01-29 04:28:55 +11001377 psc_ops->tx_clr_irq(port);
1378 if (psc_ops->tx_rdy(port))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 keepgoing |= mpc52xx_uart_int_tx_chars(port);
Grant Likely9b9129e2006-11-27 14:21:01 -07001380
Matteo Facchinetti2574b272013-05-24 20:24:58 +02001381 status = psc_ops->get_ipcr(port);
Wolfram Sangaec739e2008-12-21 02:54:32 -07001382 if (status & MPC52xx_PSC_D_DCD)
1383 uart_handle_dcd_change(port, !(status & MPC52xx_PSC_DCD));
1384
1385 if (status & MPC52xx_PSC_D_CTS)
1386 uart_handle_cts_change(port, !(status & MPC52xx_PSC_CTS));
1387
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388 /* Limit number of iteration */
John Rigby406b7d42008-01-17 08:37:25 +11001389 if (!(--pass))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390 keepgoing = 0;
1391
1392 } while (keepgoing);
Grant Likely9b9129e2006-11-27 14:21:01 -07001393
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394 return IRQ_HANDLED;
1395}
1396
Anatolij Gustschin6acc6832010-02-16 22:30:03 -07001397static irqreturn_t
1398mpc52xx_uart_int(int irq, void *dev_id)
1399{
1400 struct uart_port *port = dev_id;
1401 irqreturn_t ret;
1402
1403 spin_lock(&port->lock);
1404
1405 ret = psc_ops->handle_irq(port);
1406
1407 spin_unlock(&port->lock);
1408
1409 return ret;
1410}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411
1412/* ======================================================================== */
1413/* Console ( if applicable ) */
1414/* ======================================================================== */
1415
1416#ifdef CONFIG_SERIAL_MPC52xx_CONSOLE
1417
1418static void __init
1419mpc52xx_console_get_options(struct uart_port *port,
John Rigby406b7d42008-01-17 08:37:25 +11001420 int *baud, int *parity, int *bits, int *flow)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001421{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422 unsigned char mr1;
1423
Grant Likelyb9272df2006-11-27 14:21:02 -07001424 pr_debug("mpc52xx_console_get_options(port=%p)\n", port);
1425
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426 /* Read the mode registers */
Matteo Facchinetti2574b272013-05-24 20:24:58 +02001427 mr1 = psc_ops->get_mr1(port);
Grant Likely9b9129e2006-11-27 14:21:01 -07001428
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429 /* CT{U,L}R are write-only ! */
Grant Likelyb9272df2006-11-27 14:21:02 -07001430 *baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001431
1432 /* Parse them */
1433 switch (mr1 & MPC52xx_PSC_MODE_BITS_MASK) {
John Rigby406b7d42008-01-17 08:37:25 +11001434 case MPC52xx_PSC_MODE_5_BITS:
1435 *bits = 5;
1436 break;
1437 case MPC52xx_PSC_MODE_6_BITS:
1438 *bits = 6;
1439 break;
1440 case MPC52xx_PSC_MODE_7_BITS:
1441 *bits = 7;
1442 break;
1443 case MPC52xx_PSC_MODE_8_BITS:
1444 default:
1445 *bits = 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446 }
Grant Likely9b9129e2006-11-27 14:21:01 -07001447
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448 if (mr1 & MPC52xx_PSC_MODE_PARNONE)
1449 *parity = 'n';
1450 else
1451 *parity = mr1 & MPC52xx_PSC_MODE_PARODD ? 'o' : 'e';
1452}
1453
Grant Likely9b9129e2006-11-27 14:21:01 -07001454static void
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455mpc52xx_console_write(struct console *co, const char *s, unsigned int count)
1456{
1457 struct uart_port *port = &mpc52xx_uart_ports[co->index];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458 unsigned int i, j;
Grant Likely9b9129e2006-11-27 14:21:01 -07001459
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460 /* Disable interrupts */
John Rigby599f0302008-01-29 04:28:55 +11001461 psc_ops->cw_disable_ints(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462
1463 /* Wait the TX buffer to be empty */
Grant Likely9b9129e2006-11-27 14:21:01 -07001464 j = 5000000; /* Maximum wait */
John Rigby599f0302008-01-29 04:28:55 +11001465 while (!mpc52xx_uart_tx_empty(port) && --j)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466 udelay(1);
1467
1468 /* Write all the chars */
Russell Kingd3587882006-03-20 20:00:09 +00001469 for (i = 0; i < count; i++, s++) {
1470 /* Line return handling */
1471 if (*s == '\n')
John Rigby599f0302008-01-29 04:28:55 +11001472 psc_ops->write_char(port, '\r');
Grant Likely9b9129e2006-11-27 14:21:01 -07001473
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474 /* Send the char */
John Rigby599f0302008-01-29 04:28:55 +11001475 psc_ops->write_char(port, *s);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477 /* Wait the TX buffer to be empty */
Grant Likely9b9129e2006-11-27 14:21:01 -07001478 j = 20000; /* Maximum wait */
John Rigby599f0302008-01-29 04:28:55 +11001479 while (!mpc52xx_uart_tx_empty(port) && --j)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480 udelay(1);
1481 }
1482
1483 /* Restore interrupt state */
John Rigby599f0302008-01-29 04:28:55 +11001484 psc_ops->cw_restore_ints(port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001485}
1486
Grant Likelyb9272df2006-11-27 14:21:02 -07001487
1488static int __init
1489mpc52xx_console_setup(struct console *co, char *options)
1490{
1491 struct uart_port *port = &mpc52xx_uart_ports[co->index];
1492 struct device_node *np = mpc52xx_uart_nodes[co->index];
John Rigby599f0302008-01-29 04:28:55 +11001493 unsigned int uartclk;
Grant Likelyb9272df2006-11-27 14:21:02 -07001494 struct resource res;
1495 int ret;
1496
1497 int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
1498 int bits = 8;
1499 int parity = 'n';
1500 int flow = 'n';
1501
1502 pr_debug("mpc52xx_console_setup co=%p, co->index=%i, options=%s\n",
1503 co, co->index, options);
1504
Roel Kluinb898f4f2009-05-28 14:34:29 -07001505 if ((co->index < 0) || (co->index >= MPC52xx_PSC_MAXNUM)) {
Grant Likelyb9272df2006-11-27 14:21:02 -07001506 pr_debug("PSC%x out of range\n", co->index);
1507 return -EINVAL;
1508 }
1509
1510 if (!np) {
1511 pr_debug("PSC%x not found in device tree\n", co->index);
1512 return -EINVAL;
1513 }
1514
1515 pr_debug("Console on ttyPSC%x is %s\n",
John Rigby406b7d42008-01-17 08:37:25 +11001516 co->index, mpc52xx_uart_nodes[co->index]->full_name);
Grant Likelyb9272df2006-11-27 14:21:02 -07001517
1518 /* Fetch register locations */
John Rigby406b7d42008-01-17 08:37:25 +11001519 ret = of_address_to_resource(np, 0, &res);
1520 if (ret) {
Grant Likelyb9272df2006-11-27 14:21:02 -07001521 pr_debug("Could not get resources for PSC%x\n", co->index);
1522 return ret;
1523 }
1524
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +00001525 uartclk = mpc5xxx_get_bus_frequency(np);
John Rigby599f0302008-01-29 04:28:55 +11001526 if (uartclk == 0) {
1527 pr_debug("Could not find uart clock frequency!\n");
Grant Likelyb9272df2006-11-27 14:21:02 -07001528 return -EINVAL;
1529 }
1530
1531 /* Basic port init. Needed since we use some uart_??? func before
1532 * real init for early access */
1533 spin_lock_init(&port->lock);
John Rigby599f0302008-01-29 04:28:55 +11001534 port->uartclk = uartclk;
Grant Likelyb9272df2006-11-27 14:21:02 -07001535 port->ops = &mpc52xx_uart_ops;
1536 port->mapbase = res.start;
1537 port->membase = ioremap(res.start, sizeof(struct mpc52xx_psc));
1538 port->irq = irq_of_parse_and_map(np, 0);
1539
1540 if (port->membase == NULL)
1541 return -EINVAL;
1542
Grant Likely5dd80d52007-10-13 22:37:02 -06001543 pr_debug("mpc52xx-psc uart at %p, mapped to %p, irq=%x, freq=%i\n",
John Rigby406b7d42008-01-17 08:37:25 +11001544 (void *)port->mapbase, port->membase,
1545 port->irq, port->uartclk);
Grant Likelyb9272df2006-11-27 14:21:02 -07001546
1547 /* Setup the port parameters accoding to options */
1548 if (options)
1549 uart_parse_options(options, &baud, &parity, &bits, &flow);
1550 else
1551 mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow);
1552
1553 pr_debug("Setting console parameters: %i %i%c1 flow=%c\n",
John Rigby406b7d42008-01-17 08:37:25 +11001554 baud, bits, parity, flow);
Grant Likelyb9272df2006-11-27 14:21:02 -07001555
1556 return uart_set_options(port, co, baud, parity, bits, flow);
1557}
Grant Likelyb9272df2006-11-27 14:21:02 -07001558
Linus Torvalds1da177e2005-04-16 15:20:36 -07001559
Sylvain Munaut2d8179c2006-01-06 00:11:31 -08001560static struct uart_driver mpc52xx_uart_driver;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561
1562static struct console mpc52xx_console = {
Sylvain Munautd62de3a2006-01-06 00:11:32 -08001563 .name = "ttyPSC",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001564 .write = mpc52xx_console_write,
1565 .device = uart_console_device,
1566 .setup = mpc52xx_console_setup,
1567 .flags = CON_PRINTBUFFER,
John Rigby406b7d42008-01-17 08:37:25 +11001568 .index = -1, /* Specified on the cmdline (e.g. console=ttyPSC0) */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569 .data = &mpc52xx_uart_driver,
1570};
1571
Grant Likely9b9129e2006-11-27 14:21:01 -07001572
1573static int __init
Linus Torvalds1da177e2005-04-16 15:20:36 -07001574mpc52xx_console_init(void)
1575{
Grant Likelyb9272df2006-11-27 14:21:02 -07001576 mpc52xx_uart_of_enumerate();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001577 register_console(&mpc52xx_console);
1578 return 0;
1579}
1580
1581console_initcall(mpc52xx_console_init);
1582
1583#define MPC52xx_PSC_CONSOLE &mpc52xx_console
1584#else
1585#define MPC52xx_PSC_CONSOLE NULL
1586#endif
1587
1588
1589/* ======================================================================== */
1590/* UART Driver */
1591/* ======================================================================== */
1592
1593static struct uart_driver mpc52xx_uart_driver = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001594 .driver_name = "mpc52xx_psc_uart",
Sylvain Munautd62de3a2006-01-06 00:11:32 -08001595 .dev_name = "ttyPSC",
Sylvain Munautd62de3a2006-01-06 00:11:32 -08001596 .major = SERIAL_PSC_MAJOR,
1597 .minor = SERIAL_PSC_MINOR,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598 .nr = MPC52xx_PSC_MAXNUM,
1599 .cons = MPC52xx_PSC_CONSOLE,
1600};
1601
Grant Likelyb9272df2006-11-27 14:21:02 -07001602/* ======================================================================== */
1603/* OF Platform Driver */
1604/* ======================================================================== */
1605
Grant Likely52b80482008-02-06 22:29:25 -07001606static struct of_device_id mpc52xx_uart_of_match[] = {
1607#ifdef CONFIG_PPC_MPC52xx
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +00001608 { .compatible = "fsl,mpc5200b-psc-uart", .data = &mpc5200b_psc_ops, },
Grant Likely52b80482008-02-06 22:29:25 -07001609 { .compatible = "fsl,mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
1610 /* binding used by old lite5200 device trees: */
1611 { .compatible = "mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
1612 /* binding used by efika: */
1613 { .compatible = "mpc5200-serial", .data = &mpc52xx_psc_ops, },
1614#endif
1615#ifdef CONFIG_PPC_MPC512x
1616 { .compatible = "fsl,mpc5121-psc-uart", .data = &mpc512x_psc_ops, },
Matteo Facchinetti1f48c492013-05-24 20:24:59 +02001617 { .compatible = "fsl,mpc5125-psc-uart", .data = &mpc5125_psc_ops, },
Grant Likely52b80482008-02-06 22:29:25 -07001618#endif
Grant Likelybc775ea2008-04-29 06:40:37 -06001619 {},
Grant Likely52b80482008-02-06 22:29:25 -07001620};
1621
Bill Pemberton9671f092012-11-19 13:21:50 -05001622static int mpc52xx_uart_of_probe(struct platform_device *op)
Grant Likelyb9272df2006-11-27 14:21:02 -07001623{
1624 int idx = -1;
John Rigby599f0302008-01-29 04:28:55 +11001625 unsigned int uartclk;
Grant Likelyb9272df2006-11-27 14:21:02 -07001626 struct uart_port *port = NULL;
1627 struct resource res;
1628 int ret;
1629
Grant Likelyb9272df2006-11-27 14:21:02 -07001630 /* Check validity & presence */
1631 for (idx = 0; idx < MPC52xx_PSC_MAXNUM; idx++)
Grant Likely61c7a082010-04-13 16:12:29 -07001632 if (mpc52xx_uart_nodes[idx] == op->dev.of_node)
Grant Likelyb9272df2006-11-27 14:21:02 -07001633 break;
1634 if (idx >= MPC52xx_PSC_MAXNUM)
1635 return -EINVAL;
1636 pr_debug("Found %s assigned to ttyPSC%x\n",
John Rigby406b7d42008-01-17 08:37:25 +11001637 mpc52xx_uart_nodes[idx]->full_name, idx);
Grant Likelyb9272df2006-11-27 14:21:02 -07001638
Albrecht Dreß0d1f22e2010-04-26 11:18:12 +00001639 /* set the uart clock to the input clock of the psc, the different
1640 * prescalers are taken into account in the set_baudrate() methods
1641 * of the respective chip */
1642 uartclk = mpc5xxx_get_bus_frequency(op->dev.of_node);
John Rigby599f0302008-01-29 04:28:55 +11001643 if (uartclk == 0) {
1644 dev_dbg(&op->dev, "Could not find uart clock frequency!\n");
Grant Likelyb9272df2006-11-27 14:21:02 -07001645 return -EINVAL;
1646 }
1647
1648 /* Init the port structure */
1649 port = &mpc52xx_uart_ports[idx];
1650
1651 spin_lock_init(&port->lock);
John Rigby599f0302008-01-29 04:28:55 +11001652 port->uartclk = uartclk;
Grant Likelyb9272df2006-11-27 14:21:02 -07001653 port->fifosize = 512;
1654 port->iotype = UPIO_MEM;
1655 port->flags = UPF_BOOT_AUTOCONF |
John Rigby406b7d42008-01-17 08:37:25 +11001656 (uart_console(port) ? 0 : UPF_IOREMAP);
Grant Likelyb9272df2006-11-27 14:21:02 -07001657 port->line = idx;
1658 port->ops = &mpc52xx_uart_ops;
1659 port->dev = &op->dev;
1660
1661 /* Search for IRQ and mapbase */
Grant Likely61c7a082010-04-13 16:12:29 -07001662 ret = of_address_to_resource(op->dev.of_node, 0, &res);
John Rigby406b7d42008-01-17 08:37:25 +11001663 if (ret)
Grant Likelyb9272df2006-11-27 14:21:02 -07001664 return ret;
1665
1666 port->mapbase = res.start;
Wolfram Sang418441d92008-12-21 02:54:32 -07001667 if (!port->mapbase) {
1668 dev_dbg(&op->dev, "Could not allocate resources for PSC\n");
1669 return -EINVAL;
1670 }
1671
Grant Likely61c7a082010-04-13 16:12:29 -07001672 psc_ops->get_irq(port, op->dev.of_node);
Alan Coxd4e33fa2012-01-26 17:44:09 +00001673 if (port->irq == 0) {
Wolfram Sang418441d92008-12-21 02:54:32 -07001674 dev_dbg(&op->dev, "Could not get irq\n");
1675 return -EINVAL;
1676 }
Grant Likelyb9272df2006-11-27 14:21:02 -07001677
Grant Likely5dd80d52007-10-13 22:37:02 -06001678 dev_dbg(&op->dev, "mpc52xx-psc uart at %p, irq=%x, freq=%i\n",
John Rigby406b7d42008-01-17 08:37:25 +11001679 (void *)port->mapbase, port->irq, port->uartclk);
Grant Likelyb9272df2006-11-27 14:21:02 -07001680
Grant Likelyb9272df2006-11-27 14:21:02 -07001681 /* Add the port to the uart sub-system */
1682 ret = uart_add_one_port(&mpc52xx_uart_driver, port);
Anatolij Gustschin6acc6832010-02-16 22:30:03 -07001683 if (ret)
Wolfram Sang418441d92008-12-21 02:54:32 -07001684 return ret;
Grant Likelyb9272df2006-11-27 14:21:02 -07001685
Jingoo Han696faed2013-05-23 19:39:36 +09001686 platform_set_drvdata(op, (void *)port);
Wolfram Sang418441d92008-12-21 02:54:32 -07001687 return 0;
Grant Likelyb9272df2006-11-27 14:21:02 -07001688}
1689
1690static int
Grant Likely2dc11582010-08-06 09:25:50 -06001691mpc52xx_uart_of_remove(struct platform_device *op)
Grant Likelyb9272df2006-11-27 14:21:02 -07001692{
Jingoo Han696faed2013-05-23 19:39:36 +09001693 struct uart_port *port = platform_get_drvdata(op);
Grant Likelyb9272df2006-11-27 14:21:02 -07001694
Anatolij Gustschin6acc6832010-02-16 22:30:03 -07001695 if (port)
Grant Likelyb9272df2006-11-27 14:21:02 -07001696 uart_remove_one_port(&mpc52xx_uart_driver, port);
1697
1698 return 0;
1699}
1700
1701#ifdef CONFIG_PM
1702static int
Grant Likely2dc11582010-08-06 09:25:50 -06001703mpc52xx_uart_of_suspend(struct platform_device *op, pm_message_t state)
Grant Likelyb9272df2006-11-27 14:21:02 -07001704{
Jingoo Han696faed2013-05-23 19:39:36 +09001705 struct uart_port *port = (struct uart_port *) platform_get_drvdata(op);
Grant Likelyb9272df2006-11-27 14:21:02 -07001706
1707 if (port)
1708 uart_suspend_port(&mpc52xx_uart_driver, port);
1709
1710 return 0;
1711}
1712
1713static int
Grant Likely2dc11582010-08-06 09:25:50 -06001714mpc52xx_uart_of_resume(struct platform_device *op)
Grant Likelyb9272df2006-11-27 14:21:02 -07001715{
Jingoo Han696faed2013-05-23 19:39:36 +09001716 struct uart_port *port = (struct uart_port *) platform_get_drvdata(op);
Grant Likelyb9272df2006-11-27 14:21:02 -07001717
1718 if (port)
1719 uart_resume_port(&mpc52xx_uart_driver, port);
1720
1721 return 0;
1722}
1723#endif
1724
1725static void
Grant Likely3b5ebf82009-02-03 12:30:25 -07001726mpc52xx_uart_of_assign(struct device_node *np)
Grant Likelyb9272df2006-11-27 14:21:02 -07001727{
Grant Likelyb9272df2006-11-27 14:21:02 -07001728 int i;
1729
Grant Likely3b5ebf82009-02-03 12:30:25 -07001730 /* Find the first free PSC number */
Grant Likelyb9272df2006-11-27 14:21:02 -07001731 for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
1732 if (mpc52xx_uart_nodes[i] == NULL) {
Grant Likely3b5ebf82009-02-03 12:30:25 -07001733 of_node_get(np);
1734 mpc52xx_uart_nodes[i] = np;
1735 return;
Grant Likelyb9272df2006-11-27 14:21:02 -07001736 }
1737 }
Grant Likelyb9272df2006-11-27 14:21:02 -07001738}
1739
1740static void
1741mpc52xx_uart_of_enumerate(void)
1742{
John Rigby406b7d42008-01-17 08:37:25 +11001743 static int enum_done;
Grant Likelyb9272df2006-11-27 14:21:02 -07001744 struct device_node *np;
John Rigby25ae3a02008-01-29 04:28:56 +11001745 const struct of_device_id *match;
Grant Likelyb9272df2006-11-27 14:21:02 -07001746 int i;
1747
1748 if (enum_done)
1749 return;
1750
Grant Likely3b5ebf82009-02-03 12:30:25 -07001751 /* Assign index to each PSC in device tree */
1752 for_each_matching_node(np, mpc52xx_uart_of_match) {
John Rigby25ae3a02008-01-29 04:28:56 +11001753 match = of_match_node(mpc52xx_uart_of_match, np);
John Rigby25ae3a02008-01-29 04:28:56 +11001754 psc_ops = match->data;
Grant Likely3b5ebf82009-02-03 12:30:25 -07001755 mpc52xx_uart_of_assign(np);
Grant Likelyb9272df2006-11-27 14:21:02 -07001756 }
1757
1758 enum_done = 1;
1759
1760 for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
1761 if (mpc52xx_uart_nodes[i])
1762 pr_debug("%s assigned to ttyPSC%x\n",
John Rigby406b7d42008-01-17 08:37:25 +11001763 mpc52xx_uart_nodes[i]->full_name, i);
Grant Likelyb9272df2006-11-27 14:21:02 -07001764 }
1765}
1766
1767MODULE_DEVICE_TABLE(of, mpc52xx_uart_of_match);
1768
Grant Likely793218d2011-02-22 21:10:26 -07001769static struct platform_driver mpc52xx_uart_of_driver = {
Grant Likelyb9272df2006-11-27 14:21:02 -07001770 .probe = mpc52xx_uart_of_probe,
1771 .remove = mpc52xx_uart_of_remove,
1772#ifdef CONFIG_PM
1773 .suspend = mpc52xx_uart_of_suspend,
1774 .resume = mpc52xx_uart_of_resume,
1775#endif
Grant Likely40182942010-04-13 16:13:02 -07001776 .driver = {
1777 .name = "mpc52xx-psc-uart",
1778 .owner = THIS_MODULE,
1779 .of_match_table = mpc52xx_uart_of_match,
Grant Likelyb9272df2006-11-27 14:21:02 -07001780 },
1781};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001782
1783
1784/* ======================================================================== */
1785/* Module */
1786/* ======================================================================== */
1787
1788static int __init
1789mpc52xx_uart_init(void)
1790{
1791 int ret;
1792
Grant Likelyb9272df2006-11-27 14:21:02 -07001793 printk(KERN_INFO "Serial: MPC52xx PSC UART driver\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001794
John Rigby406b7d42008-01-17 08:37:25 +11001795 ret = uart_register_driver(&mpc52xx_uart_driver);
1796 if (ret) {
Grant Likelyb9272df2006-11-27 14:21:02 -07001797 printk(KERN_ERR "%s: uart_register_driver failed (%i)\n",
1798 __FILE__, ret);
1799 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001800 }
1801
Grant Likelyb9272df2006-11-27 14:21:02 -07001802 mpc52xx_uart_of_enumerate();
1803
Anatolij Gustschin6acc6832010-02-16 22:30:03 -07001804 /*
1805 * Map the PSC FIFO Controller and init if on MPC512x.
1806 */
Anatolij Gustschine6114fa2010-05-05 00:18:59 +02001807 if (psc_ops && psc_ops->fifoc_init) {
Anatolij Gustschin6acc6832010-02-16 22:30:03 -07001808 ret = psc_ops->fifoc_init();
1809 if (ret)
Wei Yongjun9bcc3272013-04-25 15:34:27 +08001810 goto err_init;
Anatolij Gustschin6acc6832010-02-16 22:30:03 -07001811 }
1812
Grant Likely793218d2011-02-22 21:10:26 -07001813 ret = platform_driver_register(&mpc52xx_uart_of_driver);
Grant Likelyb9272df2006-11-27 14:21:02 -07001814 if (ret) {
Grant Likely793218d2011-02-22 21:10:26 -07001815 printk(KERN_ERR "%s: platform_driver_register failed (%i)\n",
Grant Likelyb9272df2006-11-27 14:21:02 -07001816 __FILE__, ret);
Wei Yongjun9bcc3272013-04-25 15:34:27 +08001817 goto err_reg;
Grant Likelyb9272df2006-11-27 14:21:02 -07001818 }
Grant Likelyb9272df2006-11-27 14:21:02 -07001819
1820 return 0;
Wei Yongjun9bcc3272013-04-25 15:34:27 +08001821err_reg:
1822 if (psc_ops && psc_ops->fifoc_uninit)
1823 psc_ops->fifoc_uninit();
1824err_init:
1825 uart_unregister_driver(&mpc52xx_uart_driver);
1826 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001827}
1828
1829static void __exit
1830mpc52xx_uart_exit(void)
1831{
Anatolij Gustschin6acc6832010-02-16 22:30:03 -07001832 if (psc_ops->fifoc_uninit)
1833 psc_ops->fifoc_uninit();
1834
Grant Likely793218d2011-02-22 21:10:26 -07001835 platform_driver_unregister(&mpc52xx_uart_of_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001836 uart_unregister_driver(&mpc52xx_uart_driver);
1837}
1838
1839
1840module_init(mpc52xx_uart_init);
1841module_exit(mpc52xx_uart_exit);
1842
1843MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
1844MODULE_DESCRIPTION("Freescale MPC52xx PSC UART");
1845MODULE_LICENSE("GPL");