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Linux/drivers/tty/serial/mpc52xx_uart.c

  1 /*
  2  * Driver for the PSC of the Freescale MPC52xx PSCs configured as UARTs.
  3  *
  4  * FIXME According to the usermanual the status bits in the status register
  5  * are only updated when the peripherals access the FIFO and not when the
  6  * CPU access them. So since we use this bits to know when we stop writing
  7  * and reading, they may not be updated in-time and a race condition may
  8  * exists. But I haven't be able to prove this and I don't care. But if
  9  * any problem arises, it might worth checking. The TX/RX FIFO Stats
 10  * registers should be used in addition.
 11  * Update: Actually, they seem updated ... At least the bits we use.
 12  *
 13  *
 14  * Maintainer : Sylvain Munaut <tnt@246tNt.com>
 15  *
 16  * Some of the code has been inspired/copied from the 2.4 code written
 17  * by Dale Farnsworth <dfarnsworth@mvista.com>.
 18  *
 19  * Copyright (C) 2008 Freescale Semiconductor Inc.
 20  *                    John Rigby <jrigby@gmail.com>
 21  * Added support for MPC5121
 22  * Copyright (C) 2006 Secret Lab Technologies Ltd.
 23  *                    Grant Likely <grant.likely@secretlab.ca>
 24  * Copyright (C) 2004-2006 Sylvain Munaut <tnt@246tNt.com>
 25  * Copyright (C) 2003 MontaVista, Software, Inc.
 26  *
 27  * This file is licensed under the terms of the GNU General Public License
 28  * version 2. This program is licensed "as is" without any warranty of any
 29  * kind, whether express or implied.
 30  */
 31 
 32 #undef DEBUG
 33 
 34 #include <linux/device.h>
 35 #include <linux/module.h>
 36 #include <linux/tty.h>
 37 #include <linux/tty_flip.h>
 38 #include <linux/serial.h>
 39 #include <linux/sysrq.h>
 40 #include <linux/console.h>
 41 #include <linux/delay.h>
 42 #include <linux/io.h>
 43 #include <linux/of.h>
 44 #include <linux/of_platform.h>
 45 #include <linux/clk.h>
 46 
 47 #include <asm/mpc52xx.h>
 48 #include <asm/mpc52xx_psc.h>
 49 
 50 #if defined(CONFIG_SERIAL_MPC52xx_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
 51 #define SUPPORT_SYSRQ
 52 #endif
 53 
 54 #include <linux/serial_core.h>
 55 
 56 
 57 /* We've been assigned a range on the "Low-density serial ports" major */
 58 #define SERIAL_PSC_MAJOR        204
 59 #define SERIAL_PSC_MINOR        148
 60 
 61 
 62 #define ISR_PASS_LIMIT 256      /* Max number of iteration in the interrupt */
 63 
 64 
 65 static struct uart_port mpc52xx_uart_ports[MPC52xx_PSC_MAXNUM];
 66         /* Rem: - We use the read_status_mask as a shadow of
 67          *        psc->mpc52xx_psc_imr
 68          *      - It's important that is array is all zero on start as we
 69          *        use it to know if it's initialized or not ! If it's not sure
 70          *        it's cleared, then a memset(...,0,...) should be added to
 71          *        the console_init
 72          */
 73 
 74 /* lookup table for matching device nodes to index numbers */
 75 static struct device_node *mpc52xx_uart_nodes[MPC52xx_PSC_MAXNUM];
 76 
 77 static void mpc52xx_uart_of_enumerate(void);
 78 
 79 
 80 #define PSC(port) ((struct mpc52xx_psc __iomem *)((port)->membase))
 81 
 82 
 83 /* Forward declaration of the interruption handling routine */
 84 static irqreturn_t mpc52xx_uart_int(int irq, void *dev_id);
 85 static irqreturn_t mpc5xxx_uart_process_int(struct uart_port *port);
 86 
 87 /* ======================================================================== */
 88 /* PSC fifo operations for isolating differences between 52xx and 512x      */
 89 /* ======================================================================== */
 90 
 91 struct psc_ops {
 92         void            (*fifo_init)(struct uart_port *port);
 93         int             (*raw_rx_rdy)(struct uart_port *port);
 94         int             (*raw_tx_rdy)(struct uart_port *port);
 95         int             (*rx_rdy)(struct uart_port *port);
 96         int             (*tx_rdy)(struct uart_port *port);
 97         int             (*tx_empty)(struct uart_port *port);
 98         void            (*stop_rx)(struct uart_port *port);
 99         void            (*start_tx)(struct uart_port *port);
100         void            (*stop_tx)(struct uart_port *port);
101         void            (*rx_clr_irq)(struct uart_port *port);
102         void            (*tx_clr_irq)(struct uart_port *port);
103         void            (*write_char)(struct uart_port *port, unsigned char c);
104         unsigned char   (*read_char)(struct uart_port *port);
105         void            (*cw_disable_ints)(struct uart_port *port);
106         void            (*cw_restore_ints)(struct uart_port *port);
107         unsigned int    (*set_baudrate)(struct uart_port *port,
108                                         struct ktermios *new,
109                                         struct ktermios *old);
110         int             (*clock_alloc)(struct uart_port *port);
111         void            (*clock_relse)(struct uart_port *port);
112         int             (*clock)(struct uart_port *port, int enable);
113         int             (*fifoc_init)(void);
114         void            (*fifoc_uninit)(void);
115         void            (*get_irq)(struct uart_port *, struct device_node *);
116         irqreturn_t     (*handle_irq)(struct uart_port *port);
117         u16             (*get_status)(struct uart_port *port);
118         u8              (*get_ipcr)(struct uart_port *port);
119         void            (*command)(struct uart_port *port, u8 cmd);
120         void            (*set_mode)(struct uart_port *port, u8 mr1, u8 mr2);
121         void            (*set_rts)(struct uart_port *port, int state);
122         void            (*enable_ms)(struct uart_port *port);
123         void            (*set_sicr)(struct uart_port *port, u32 val);
124         void            (*set_imr)(struct uart_port *port, u16 val);
125         u8              (*get_mr1)(struct uart_port *port);
126 };
127 
128 /* setting the prescaler and divisor reg is common for all chips */
129 static inline void mpc52xx_set_divisor(struct mpc52xx_psc __iomem *psc,
130                                        u16 prescaler, unsigned int divisor)
131 {
132         /* select prescaler */
133         out_be16(&psc->mpc52xx_psc_clock_select, prescaler);
134         out_8(&psc->ctur, divisor >> 8);
135         out_8(&psc->ctlr, divisor & 0xff);
136 }
137 
138 static u16 mpc52xx_psc_get_status(struct uart_port *port)
139 {
140         return in_be16(&PSC(port)->mpc52xx_psc_status);
141 }
142 
143 static u8 mpc52xx_psc_get_ipcr(struct uart_port *port)
144 {
145         return in_8(&PSC(port)->mpc52xx_psc_ipcr);
146 }
147 
148 static void mpc52xx_psc_command(struct uart_port *port, u8 cmd)
149 {
150         out_8(&PSC(port)->command, cmd);
151 }
152 
153 static void mpc52xx_psc_set_mode(struct uart_port *port, u8 mr1, u8 mr2)
154 {
155         out_8(&PSC(port)->command, MPC52xx_PSC_SEL_MODE_REG_1);
156         out_8(&PSC(port)->mode, mr1);
157         out_8(&PSC(port)->mode, mr2);
158 }
159 
160 static void mpc52xx_psc_set_rts(struct uart_port *port, int state)
161 {
162         if (state)
163                 out_8(&PSC(port)->op1, MPC52xx_PSC_OP_RTS);
164         else
165                 out_8(&PSC(port)->op0, MPC52xx_PSC_OP_RTS);
166 }
167 
168 static void mpc52xx_psc_enable_ms(struct uart_port *port)
169 {
170         struct mpc52xx_psc __iomem *psc = PSC(port);
171 
172         /* clear D_*-bits by reading them */
173         in_8(&psc->mpc52xx_psc_ipcr);
174         /* enable CTS and DCD as IPC interrupts */
175         out_8(&psc->mpc52xx_psc_acr, MPC52xx_PSC_IEC_CTS | MPC52xx_PSC_IEC_DCD);
176 
177         port->read_status_mask |= MPC52xx_PSC_IMR_IPC;
178         out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
179 }
180 
181 static void mpc52xx_psc_set_sicr(struct uart_port *port, u32 val)
182 {
183         out_be32(&PSC(port)->sicr, val);
184 }
185 
186 static void mpc52xx_psc_set_imr(struct uart_port *port, u16 val)
187 {
188         out_be16(&PSC(port)->mpc52xx_psc_imr, val);
189 }
190 
191 static u8 mpc52xx_psc_get_mr1(struct uart_port *port)
192 {
193         out_8(&PSC(port)->command, MPC52xx_PSC_SEL_MODE_REG_1);
194         return in_8(&PSC(port)->mode);
195 }
196 
197 #ifdef CONFIG_PPC_MPC52xx
198 #define FIFO_52xx(port) ((struct mpc52xx_psc_fifo __iomem *)(PSC(port)+1))
199 static void mpc52xx_psc_fifo_init(struct uart_port *port)
200 {
201         struct mpc52xx_psc __iomem *psc = PSC(port);
202         struct mpc52xx_psc_fifo __iomem *fifo = FIFO_52xx(port);
203 
204         out_8(&fifo->rfcntl, 0x00);
205         out_be16(&fifo->rfalarm, 0x1ff);
206         out_8(&fifo->tfcntl, 0x07);
207         out_be16(&fifo->tfalarm, 0x80);
208 
209         port->read_status_mask |= MPC52xx_PSC_IMR_RXRDY | MPC52xx_PSC_IMR_TXRDY;
210         out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
211 }
212 
213 static int mpc52xx_psc_raw_rx_rdy(struct uart_port *port)
214 {
215         return in_be16(&PSC(port)->mpc52xx_psc_status)
216             & MPC52xx_PSC_SR_RXRDY;
217 }
218 
219 static int mpc52xx_psc_raw_tx_rdy(struct uart_port *port)
220 {
221         return in_be16(&PSC(port)->mpc52xx_psc_status)
222             & MPC52xx_PSC_SR_TXRDY;
223 }
224 
225 
226 static int mpc52xx_psc_rx_rdy(struct uart_port *port)
227 {
228         return in_be16(&PSC(port)->mpc52xx_psc_isr)
229             & port->read_status_mask
230             & MPC52xx_PSC_IMR_RXRDY;
231 }
232 
233 static int mpc52xx_psc_tx_rdy(struct uart_port *port)
234 {
235         return in_be16(&PSC(port)->mpc52xx_psc_isr)
236             & port->read_status_mask
237             & MPC52xx_PSC_IMR_TXRDY;
238 }
239 
240 static int mpc52xx_psc_tx_empty(struct uart_port *port)
241 {
242         return in_be16(&PSC(port)->mpc52xx_psc_status)
243             & MPC52xx_PSC_SR_TXEMP;
244 }
245 
246 static void mpc52xx_psc_start_tx(struct uart_port *port)
247 {
248         port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY;
249         out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
250 }
251 
252 static void mpc52xx_psc_stop_tx(struct uart_port *port)
253 {
254         port->read_status_mask &= ~MPC52xx_PSC_IMR_TXRDY;
255         out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
256 }
257 
258 static void mpc52xx_psc_stop_rx(struct uart_port *port)
259 {
260         port->read_status_mask &= ~MPC52xx_PSC_IMR_RXRDY;
261         out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
262 }
263 
264 static void mpc52xx_psc_rx_clr_irq(struct uart_port *port)
265 {
266 }
267 
268 static void mpc52xx_psc_tx_clr_irq(struct uart_port *port)
269 {
270 }
271 
272 static void mpc52xx_psc_write_char(struct uart_port *port, unsigned char c)
273 {
274         out_8(&PSC(port)->mpc52xx_psc_buffer_8, c);
275 }
276 
277 static unsigned char mpc52xx_psc_read_char(struct uart_port *port)
278 {
279         return in_8(&PSC(port)->mpc52xx_psc_buffer_8);
280 }
281 
282 static void mpc52xx_psc_cw_disable_ints(struct uart_port *port)
283 {
284         out_be16(&PSC(port)->mpc52xx_psc_imr, 0);
285 }
286 
287 static void mpc52xx_psc_cw_restore_ints(struct uart_port *port)
288 {
289         out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
290 }
291 
292 static unsigned int mpc5200_psc_set_baudrate(struct uart_port *port,
293                                              struct ktermios *new,
294                                              struct ktermios *old)
295 {
296         unsigned int baud;
297         unsigned int divisor;
298 
299         /* The 5200 has a fixed /32 prescaler, uartclk contains the ipb freq */
300         baud = uart_get_baud_rate(port, new, old,
301                                   port->uartclk / (32 * 0xffff) + 1,
302                                   port->uartclk / 32);
303         divisor = (port->uartclk + 16 * baud) / (32 * baud);
304 
305         /* enable the /32 prescaler and set the divisor */
306         mpc52xx_set_divisor(PSC(port), 0xdd00, divisor);
307         return baud;
308 }
309 
310 static unsigned int mpc5200b_psc_set_baudrate(struct uart_port *port,
311                                               struct ktermios *new,
312                                               struct ktermios *old)
313 {
314         unsigned int baud;
315         unsigned int divisor;
316         u16 prescaler;
317 
318         /* The 5200B has a selectable /4 or /32 prescaler, uartclk contains the
319          * ipb freq */
320         baud = uart_get_baud_rate(port, new, old,
321                                   port->uartclk / (32 * 0xffff) + 1,
322                                   port->uartclk / 4);
323         divisor = (port->uartclk + 2 * baud) / (4 * baud);
324 
325         /* select the proper prescaler and set the divisor
326          * prefer high prescaler for more tolerance on low baudrates */
327         if (divisor > 0xffff || baud <= 115200) {
328                 divisor = (divisor + 4) / 8;
329                 prescaler = 0xdd00; /* /32 */
330         } else
331                 prescaler = 0xff00; /* /4 */
332         mpc52xx_set_divisor(PSC(port), prescaler, divisor);
333         return baud;
334 }
335 
336 static void mpc52xx_psc_get_irq(struct uart_port *port, struct device_node *np)
337 {
338         port->irqflags = 0;
339         port->irq = irq_of_parse_and_map(np, 0);
340 }
341 
342 /* 52xx specific interrupt handler. The caller holds the port lock */
343 static irqreturn_t mpc52xx_psc_handle_irq(struct uart_port *port)
344 {
345         return mpc5xxx_uart_process_int(port);
346 }
347 
348 static struct psc_ops mpc52xx_psc_ops = {
349         .fifo_init = mpc52xx_psc_fifo_init,
350         .raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
351         .raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
352         .rx_rdy = mpc52xx_psc_rx_rdy,
353         .tx_rdy = mpc52xx_psc_tx_rdy,
354         .tx_empty = mpc52xx_psc_tx_empty,
355         .stop_rx = mpc52xx_psc_stop_rx,
356         .start_tx = mpc52xx_psc_start_tx,
357         .stop_tx = mpc52xx_psc_stop_tx,
358         .rx_clr_irq = mpc52xx_psc_rx_clr_irq,
359         .tx_clr_irq = mpc52xx_psc_tx_clr_irq,
360         .write_char = mpc52xx_psc_write_char,
361         .read_char = mpc52xx_psc_read_char,
362         .cw_disable_ints = mpc52xx_psc_cw_disable_ints,
363         .cw_restore_ints = mpc52xx_psc_cw_restore_ints,
364         .set_baudrate = mpc5200_psc_set_baudrate,
365         .get_irq = mpc52xx_psc_get_irq,
366         .handle_irq = mpc52xx_psc_handle_irq,
367         .get_status = mpc52xx_psc_get_status,
368         .get_ipcr = mpc52xx_psc_get_ipcr,
369         .command = mpc52xx_psc_command,
370         .set_mode = mpc52xx_psc_set_mode,
371         .set_rts = mpc52xx_psc_set_rts,
372         .enable_ms = mpc52xx_psc_enable_ms,
373         .set_sicr = mpc52xx_psc_set_sicr,
374         .set_imr = mpc52xx_psc_set_imr,
375         .get_mr1 = mpc52xx_psc_get_mr1,
376 };
377 
378 static struct psc_ops mpc5200b_psc_ops = {
379         .fifo_init = mpc52xx_psc_fifo_init,
380         .raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
381         .raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
382         .rx_rdy = mpc52xx_psc_rx_rdy,
383         .tx_rdy = mpc52xx_psc_tx_rdy,
384         .tx_empty = mpc52xx_psc_tx_empty,
385         .stop_rx = mpc52xx_psc_stop_rx,
386         .start_tx = mpc52xx_psc_start_tx,
387         .stop_tx = mpc52xx_psc_stop_tx,
388         .rx_clr_irq = mpc52xx_psc_rx_clr_irq,
389         .tx_clr_irq = mpc52xx_psc_tx_clr_irq,
390         .write_char = mpc52xx_psc_write_char,
391         .read_char = mpc52xx_psc_read_char,
392         .cw_disable_ints = mpc52xx_psc_cw_disable_ints,
393         .cw_restore_ints = mpc52xx_psc_cw_restore_ints,
394         .set_baudrate = mpc5200b_psc_set_baudrate,
395         .get_irq = mpc52xx_psc_get_irq,
396         .handle_irq = mpc52xx_psc_handle_irq,
397         .get_status = mpc52xx_psc_get_status,
398         .get_ipcr = mpc52xx_psc_get_ipcr,
399         .command = mpc52xx_psc_command,
400         .set_mode = mpc52xx_psc_set_mode,
401         .set_rts = mpc52xx_psc_set_rts,
402         .enable_ms = mpc52xx_psc_enable_ms,
403         .set_sicr = mpc52xx_psc_set_sicr,
404         .set_imr = mpc52xx_psc_set_imr,
405         .get_mr1 = mpc52xx_psc_get_mr1,
406 };
407 
408 #endif /* CONFIG_MPC52xx */
409 
410 #ifdef CONFIG_PPC_MPC512x
411 #define FIFO_512x(port) ((struct mpc512x_psc_fifo __iomem *)(PSC(port)+1))
412 
413 /* PSC FIFO Controller for mpc512x */
414 struct psc_fifoc {
415         u32 fifoc_cmd;
416         u32 fifoc_int;
417         u32 fifoc_dma;
418         u32 fifoc_axe;
419         u32 fifoc_debug;
420 };
421 
422 static struct psc_fifoc __iomem *psc_fifoc;
423 static unsigned int psc_fifoc_irq;
424 static struct clk *psc_fifoc_clk;
425 
426 static void mpc512x_psc_fifo_init(struct uart_port *port)
427 {
428         /* /32 prescaler */
429         out_be16(&PSC(port)->mpc52xx_psc_clock_select, 0xdd00);
430 
431         out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_RESET_SLICE);
432         out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
433         out_be32(&FIFO_512x(port)->txalarm, 1);
434         out_be32(&FIFO_512x(port)->tximr, 0);
435 
436         out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_RESET_SLICE);
437         out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
438         out_be32(&FIFO_512x(port)->rxalarm, 1);
439         out_be32(&FIFO_512x(port)->rximr, 0);
440 
441         out_be32(&FIFO_512x(port)->tximr, MPC512x_PSC_FIFO_ALARM);
442         out_be32(&FIFO_512x(port)->rximr, MPC512x_PSC_FIFO_ALARM);
443 }
444 
445 static int mpc512x_psc_raw_rx_rdy(struct uart_port *port)
446 {
447         return !(in_be32(&FIFO_512x(port)->rxsr) & MPC512x_PSC_FIFO_EMPTY);
448 }
449 
450 static int mpc512x_psc_raw_tx_rdy(struct uart_port *port)
451 {
452         return !(in_be32(&FIFO_512x(port)->txsr) & MPC512x_PSC_FIFO_FULL);
453 }
454 
455 static int mpc512x_psc_rx_rdy(struct uart_port *port)
456 {
457         return in_be32(&FIFO_512x(port)->rxsr)
458             & in_be32(&FIFO_512x(port)->rximr)
459             & MPC512x_PSC_FIFO_ALARM;
460 }
461 
462 static int mpc512x_psc_tx_rdy(struct uart_port *port)
463 {
464         return in_be32(&FIFO_512x(port)->txsr)
465             & in_be32(&FIFO_512x(port)->tximr)
466             & MPC512x_PSC_FIFO_ALARM;
467 }
468 
469 static int mpc512x_psc_tx_empty(struct uart_port *port)
470 {
471         return in_be32(&FIFO_512x(port)->txsr)
472             & MPC512x_PSC_FIFO_EMPTY;
473 }
474 
475 static void mpc512x_psc_stop_rx(struct uart_port *port)
476 {
477         unsigned long rx_fifo_imr;
478 
479         rx_fifo_imr = in_be32(&FIFO_512x(port)->rximr);
480         rx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
481         out_be32(&FIFO_512x(port)->rximr, rx_fifo_imr);
482 }
483 
484 static void mpc512x_psc_start_tx(struct uart_port *port)
485 {
486         unsigned long tx_fifo_imr;
487 
488         tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
489         tx_fifo_imr |= MPC512x_PSC_FIFO_ALARM;
490         out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
491 }
492 
493 static void mpc512x_psc_stop_tx(struct uart_port *port)
494 {
495         unsigned long tx_fifo_imr;
496 
497         tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
498         tx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
499         out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
500 }
501 
502 static void mpc512x_psc_rx_clr_irq(struct uart_port *port)
503 {
504         out_be32(&FIFO_512x(port)->rxisr, in_be32(&FIFO_512x(port)->rxisr));
505 }
506 
507 static void mpc512x_psc_tx_clr_irq(struct uart_port *port)
508 {
509         out_be32(&FIFO_512x(port)->txisr, in_be32(&FIFO_512x(port)->txisr));
510 }
511 
512 static void mpc512x_psc_write_char(struct uart_port *port, unsigned char c)
513 {
514         out_8(&FIFO_512x(port)->txdata_8, c);
515 }
516 
517 static unsigned char mpc512x_psc_read_char(struct uart_port *port)
518 {
519         return in_8(&FIFO_512x(port)->rxdata_8);
520 }
521 
522 static void mpc512x_psc_cw_disable_ints(struct uart_port *port)
523 {
524         port->read_status_mask =
525                 in_be32(&FIFO_512x(port)->tximr) << 16 |
526                 in_be32(&FIFO_512x(port)->rximr);
527         out_be32(&FIFO_512x(port)->tximr, 0);
528         out_be32(&FIFO_512x(port)->rximr, 0);
529 }
530 
531 static void mpc512x_psc_cw_restore_ints(struct uart_port *port)
532 {
533         out_be32(&FIFO_512x(port)->tximr,
534                 (port->read_status_mask >> 16) & 0x7f);
535         out_be32(&FIFO_512x(port)->rximr, port->read_status_mask & 0x7f);
536 }
537 
538 static unsigned int mpc512x_psc_set_baudrate(struct uart_port *port,
539                                              struct ktermios *new,
540                                              struct ktermios *old)
541 {
542         unsigned int baud;
543         unsigned int divisor;
544 
545         /*
546          * The "MPC5121e Microcontroller Reference Manual, Rev. 3" says on
547          * pg. 30-10 that the chip supports a /32 and a /10 prescaler.
548          * Furthermore, it states that "After reset, the prescaler by 10
549          * for the UART mode is selected", but the reset register value is
550          * 0x0000 which means a /32 prescaler. This is wrong.
551          *
552          * In reality using /32 prescaler doesn't work, as it is not supported!
553          * Use /16 or /10 prescaler, see "MPC5121e Hardware Design Guide",
554          * Chapter 4.1 PSC in UART Mode.
555          * Calculate with a /16 prescaler here.
556          */
557 
558         /* uartclk contains the ips freq */
559         baud = uart_get_baud_rate(port, new, old,
560                                   port->uartclk / (16 * 0xffff) + 1,
561                                   port->uartclk / 16);
562         divisor = (port->uartclk + 8 * baud) / (16 * baud);
563 
564         /* enable the /16 prescaler and set the divisor */
565         mpc52xx_set_divisor(PSC(port), 0xdd00, divisor);
566         return baud;
567 }
568 
569 /* Init PSC FIFO Controller */
570 static int __init mpc512x_psc_fifoc_init(void)
571 {
572         int err;
573         struct device_node *np;
574         struct clk *clk;
575 
576         /* default error code, potentially overwritten by clock calls */
577         err = -ENODEV;
578 
579         np = of_find_compatible_node(NULL, NULL,
580                                      "fsl,mpc5121-psc-fifo");
581         if (!np) {
582                 pr_err("%s: Can't find FIFOC node\n", __func__);
583                 goto out_err;
584         }
585 
586         clk = of_clk_get(np, 0);
587         if (IS_ERR(clk)) {
588                 /* backwards compat with device trees that lack clock specs */
589                 clk = clk_get_sys(np->name, "ipg");
590         }
591         if (IS_ERR(clk)) {
592                 pr_err("%s: Can't lookup FIFO clock\n", __func__);
593                 err = PTR_ERR(clk);
594                 goto out_ofnode_put;
595         }
596         if (clk_prepare_enable(clk)) {
597                 pr_err("%s: Can't enable FIFO clock\n", __func__);
598                 clk_put(clk);
599                 goto out_ofnode_put;
600         }
601         psc_fifoc_clk = clk;
602 
603         psc_fifoc = of_iomap(np, 0);
604         if (!psc_fifoc) {
605                 pr_err("%s: Can't map FIFOC\n", __func__);
606                 goto out_clk_disable;
607         }
608 
609         psc_fifoc_irq = irq_of_parse_and_map(np, 0);
610         if (psc_fifoc_irq == 0) {
611                 pr_err("%s: Can't get FIFOC irq\n", __func__);
612                 goto out_unmap;
613         }
614 
615         of_node_put(np);
616         return 0;
617 
618 out_unmap:
619         iounmap(psc_fifoc);
620 out_clk_disable:
621         clk_disable_unprepare(psc_fifoc_clk);
622         clk_put(psc_fifoc_clk);
623 out_ofnode_put:
624         of_node_put(np);
625 out_err:
626         return err;
627 }
628 
629 static void __exit mpc512x_psc_fifoc_uninit(void)
630 {
631         iounmap(psc_fifoc);
632 
633         /* disable the clock, errors are not fatal */
634         if (psc_fifoc_clk) {
635                 clk_disable_unprepare(psc_fifoc_clk);
636                 clk_put(psc_fifoc_clk);
637                 psc_fifoc_clk = NULL;
638         }
639 }
640 
641 /* 512x specific interrupt handler. The caller holds the port lock */
642 static irqreturn_t mpc512x_psc_handle_irq(struct uart_port *port)
643 {
644         unsigned long fifoc_int;
645         int psc_num;
646 
647         /* Read pending PSC FIFOC interrupts */
648         fifoc_int = in_be32(&psc_fifoc->fifoc_int);
649 
650         /* Check if it is an interrupt for this port */
651         psc_num = (port->mapbase & 0xf00) >> 8;
652         if (test_bit(psc_num, &fifoc_int) ||
653             test_bit(psc_num + 16, &fifoc_int))
654                 return mpc5xxx_uart_process_int(port);
655 
656         return IRQ_NONE;
657 }
658 
659 static struct clk *psc_mclk_clk[MPC52xx_PSC_MAXNUM];
660 static struct clk *psc_ipg_clk[MPC52xx_PSC_MAXNUM];
661 
662 /* called from within the .request_port() callback (allocation) */
663 static int mpc512x_psc_alloc_clock(struct uart_port *port)
664 {
665         int psc_num;
666         struct clk *clk;
667         int err;
668 
669         psc_num = (port->mapbase & 0xf00) >> 8;
670 
671         clk = devm_clk_get(port->dev, "mclk");
672         if (IS_ERR(clk)) {
673                 dev_err(port->dev, "Failed to get MCLK!\n");
674                 err = PTR_ERR(clk);
675                 goto out_err;
676         }
677         err = clk_prepare_enable(clk);
678         if (err) {
679                 dev_err(port->dev, "Failed to enable MCLK!\n");
680                 goto out_err;
681         }
682         psc_mclk_clk[psc_num] = clk;
683 
684         clk = devm_clk_get(port->dev, "ipg");
685         if (IS_ERR(clk)) {
686                 dev_err(port->dev, "Failed to get IPG clock!\n");
687                 err = PTR_ERR(clk);
688                 goto out_err;
689         }
690         err = clk_prepare_enable(clk);
691         if (err) {
692                 dev_err(port->dev, "Failed to enable IPG clock!\n");
693                 goto out_err;
694         }
695         psc_ipg_clk[psc_num] = clk;
696 
697         return 0;
698 
699 out_err:
700         if (psc_mclk_clk[psc_num]) {
701                 clk_disable_unprepare(psc_mclk_clk[psc_num]);
702                 psc_mclk_clk[psc_num] = NULL;
703         }
704         if (psc_ipg_clk[psc_num]) {
705                 clk_disable_unprepare(psc_ipg_clk[psc_num]);
706                 psc_ipg_clk[psc_num] = NULL;
707         }
708         return err;
709 }
710 
711 /* called from within the .release_port() callback (release) */
712 static void mpc512x_psc_relse_clock(struct uart_port *port)
713 {
714         int psc_num;
715         struct clk *clk;
716 
717         psc_num = (port->mapbase & 0xf00) >> 8;
718         clk = psc_mclk_clk[psc_num];
719         if (clk) {
720                 clk_disable_unprepare(clk);
721                 psc_mclk_clk[psc_num] = NULL;
722         }
723         if (psc_ipg_clk[psc_num]) {
724                 clk_disable_unprepare(psc_ipg_clk[psc_num]);
725                 psc_ipg_clk[psc_num] = NULL;
726         }
727 }
728 
729 /* implementation of the .clock() callback (enable/disable) */
730 static int mpc512x_psc_endis_clock(struct uart_port *port, int enable)
731 {
732         int psc_num;
733         struct clk *psc_clk;
734         int ret;
735 
736         if (uart_console(port))
737                 return 0;
738 
739         psc_num = (port->mapbase & 0xf00) >> 8;
740         psc_clk = psc_mclk_clk[psc_num];
741         if (!psc_clk) {
742                 dev_err(port->dev, "Failed to get PSC clock entry!\n");
743                 return -ENODEV;
744         }
745 
746         dev_dbg(port->dev, "mclk %sable\n", enable ? "en" : "dis");
747         if (enable) {
748                 ret = clk_enable(psc_clk);
749                 if (ret)
750                         dev_err(port->dev, "Failed to enable MCLK!\n");
751                 return ret;
752         } else {
753                 clk_disable(psc_clk);
754                 return 0;
755         }
756 }
757 
758 static void mpc512x_psc_get_irq(struct uart_port *port, struct device_node *np)
759 {
760         port->irqflags = IRQF_SHARED;
761         port->irq = psc_fifoc_irq;
762 }
763 #endif
764 
765 #ifdef CONFIG_PPC_MPC512x
766 
767 #define PSC_5125(port) ((struct mpc5125_psc __iomem *)((port)->membase))
768 #define FIFO_5125(port) ((struct mpc512x_psc_fifo __iomem *)(PSC_5125(port)+1))
769 
770 static void mpc5125_psc_fifo_init(struct uart_port *port)
771 {
772         /* /32 prescaler */
773         out_8(&PSC_5125(port)->mpc52xx_psc_clock_select, 0xdd);
774 
775         out_be32(&FIFO_5125(port)->txcmd, MPC512x_PSC_FIFO_RESET_SLICE);
776         out_be32(&FIFO_5125(port)->txcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
777         out_be32(&FIFO_5125(port)->txalarm, 1);
778         out_be32(&FIFO_5125(port)->tximr, 0);
779 
780         out_be32(&FIFO_5125(port)->rxcmd, MPC512x_PSC_FIFO_RESET_SLICE);
781         out_be32(&FIFO_5125(port)->rxcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
782         out_be32(&FIFO_5125(port)->rxalarm, 1);
783         out_be32(&FIFO_5125(port)->rximr, 0);
784 
785         out_be32(&FIFO_5125(port)->tximr, MPC512x_PSC_FIFO_ALARM);
786         out_be32(&FIFO_5125(port)->rximr, MPC512x_PSC_FIFO_ALARM);
787 }
788 
789 static int mpc5125_psc_raw_rx_rdy(struct uart_port *port)
790 {
791         return !(in_be32(&FIFO_5125(port)->rxsr) & MPC512x_PSC_FIFO_EMPTY);
792 }
793 
794 static int mpc5125_psc_raw_tx_rdy(struct uart_port *port)
795 {
796         return !(in_be32(&FIFO_5125(port)->txsr) & MPC512x_PSC_FIFO_FULL);
797 }
798 
799 static int mpc5125_psc_rx_rdy(struct uart_port *port)
800 {
801         return in_be32(&FIFO_5125(port)->rxsr) &
802                in_be32(&FIFO_5125(port)->rximr) & MPC512x_PSC_FIFO_ALARM;
803 }
804 
805 static int mpc5125_psc_tx_rdy(struct uart_port *port)
806 {
807         return in_be32(&FIFO_5125(port)->txsr) &
808                in_be32(&FIFO_5125(port)->tximr) & MPC512x_PSC_FIFO_ALARM;
809 }
810 
811 static int mpc5125_psc_tx_empty(struct uart_port *port)
812 {
813         return in_be32(&FIFO_5125(port)->txsr) & MPC512x_PSC_FIFO_EMPTY;
814 }
815 
816 static void mpc5125_psc_stop_rx(struct uart_port *port)
817 {
818         unsigned long rx_fifo_imr;
819 
820         rx_fifo_imr = in_be32(&FIFO_5125(port)->rximr);
821         rx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
822         out_be32(&FIFO_5125(port)->rximr, rx_fifo_imr);
823 }
824 
825 static void mpc5125_psc_start_tx(struct uart_port *port)
826 {
827         unsigned long tx_fifo_imr;
828 
829         tx_fifo_imr = in_be32(&FIFO_5125(port)->tximr);
830         tx_fifo_imr |= MPC512x_PSC_FIFO_ALARM;
831         out_be32(&FIFO_5125(port)->tximr, tx_fifo_imr);
832 }
833 
834 static void mpc5125_psc_stop_tx(struct uart_port *port)
835 {
836         unsigned long tx_fifo_imr;
837 
838         tx_fifo_imr = in_be32(&FIFO_5125(port)->tximr);
839         tx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
840         out_be32(&FIFO_5125(port)->tximr, tx_fifo_imr);
841 }
842 
843 static void mpc5125_psc_rx_clr_irq(struct uart_port *port)
844 {
845         out_be32(&FIFO_5125(port)->rxisr, in_be32(&FIFO_5125(port)->rxisr));
846 }
847 
848 static void mpc5125_psc_tx_clr_irq(struct uart_port *port)
849 {
850         out_be32(&FIFO_5125(port)->txisr, in_be32(&FIFO_5125(port)->txisr));
851 }
852 
853 static void mpc5125_psc_write_char(struct uart_port *port, unsigned char c)
854 {
855         out_8(&FIFO_5125(port)->txdata_8, c);
856 }
857 
858 static unsigned char mpc5125_psc_read_char(struct uart_port *port)
859 {
860         return in_8(&FIFO_5125(port)->rxdata_8);
861 }
862 
863 static void mpc5125_psc_cw_disable_ints(struct uart_port *port)
864 {
865         port->read_status_mask =
866                 in_be32(&FIFO_5125(port)->tximr) << 16 |
867                 in_be32(&FIFO_5125(port)->rximr);
868         out_be32(&FIFO_5125(port)->tximr, 0);
869         out_be32(&FIFO_5125(port)->rximr, 0);
870 }
871 
872 static void mpc5125_psc_cw_restore_ints(struct uart_port *port)
873 {
874         out_be32(&FIFO_5125(port)->tximr,
875                 (port->read_status_mask >> 16) & 0x7f);
876         out_be32(&FIFO_5125(port)->rximr, port->read_status_mask & 0x7f);
877 }
878 
879 static inline void mpc5125_set_divisor(struct mpc5125_psc __iomem *psc,
880                 u8 prescaler, unsigned int divisor)
881 {
882         /* select prescaler */
883         out_8(&psc->mpc52xx_psc_clock_select, prescaler);
884         out_8(&psc->ctur, divisor >> 8);
885         out_8(&psc->ctlr, divisor & 0xff);
886 }
887 
888 static unsigned int mpc5125_psc_set_baudrate(struct uart_port *port,
889                                              struct ktermios *new,
890                                              struct ktermios *old)
891 {
892         unsigned int baud;
893         unsigned int divisor;
894 
895         /*
896          * Calculate with a /16 prescaler here.
897          */
898 
899         /* uartclk contains the ips freq */
900         baud = uart_get_baud_rate(port, new, old,
901                                   port->uartclk / (16 * 0xffff) + 1,
902                                   port->uartclk / 16);
903         divisor = (port->uartclk + 8 * baud) / (16 * baud);
904 
905         /* enable the /16 prescaler and set the divisor */
906         mpc5125_set_divisor(PSC_5125(port), 0xdd, divisor);
907         return baud;
908 }
909 
910 /*
911  * MPC5125 have compatible PSC FIFO Controller.
912  * Special init not needed.
913  */
914 static u16 mpc5125_psc_get_status(struct uart_port *port)
915 {
916         return in_be16(&PSC_5125(port)->mpc52xx_psc_status);
917 }
918 
919 static u8 mpc5125_psc_get_ipcr(struct uart_port *port)
920 {
921         return in_8(&PSC_5125(port)->mpc52xx_psc_ipcr);
922 }
923 
924 static void mpc5125_psc_command(struct uart_port *port, u8 cmd)
925 {
926         out_8(&PSC_5125(port)->command, cmd);
927 }
928 
929 static void mpc5125_psc_set_mode(struct uart_port *port, u8 mr1, u8 mr2)
930 {
931         out_8(&PSC_5125(port)->mr1, mr1);
932         out_8(&PSC_5125(port)->mr2, mr2);
933 }
934 
935 static void mpc5125_psc_set_rts(struct uart_port *port, int state)
936 {
937         if (state & TIOCM_RTS)
938                 out_8(&PSC_5125(port)->op1, MPC52xx_PSC_OP_RTS);
939         else
940                 out_8(&PSC_5125(port)->op0, MPC52xx_PSC_OP_RTS);
941 }
942 
943 static void mpc5125_psc_enable_ms(struct uart_port *port)
944 {
945         struct mpc5125_psc __iomem *psc = PSC_5125(port);
946 
947         /* clear D_*-bits by reading them */
948         in_8(&psc->mpc52xx_psc_ipcr);
949         /* enable CTS and DCD as IPC interrupts */
950         out_8(&psc->mpc52xx_psc_acr, MPC52xx_PSC_IEC_CTS | MPC52xx_PSC_IEC_DCD);
951 
952         port->read_status_mask |= MPC52xx_PSC_IMR_IPC;
953         out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
954 }
955 
956 static void mpc5125_psc_set_sicr(struct uart_port *port, u32 val)
957 {
958         out_be32(&PSC_5125(port)->sicr, val);
959 }
960 
961 static void mpc5125_psc_set_imr(struct uart_port *port, u16 val)
962 {
963         out_be16(&PSC_5125(port)->mpc52xx_psc_imr, val);
964 }
965 
966 static u8 mpc5125_psc_get_mr1(struct uart_port *port)
967 {
968         return in_8(&PSC_5125(port)->mr1);
969 }
970 
971 static struct psc_ops mpc5125_psc_ops = {
972         .fifo_init = mpc5125_psc_fifo_init,
973         .raw_rx_rdy = mpc5125_psc_raw_rx_rdy,
974         .raw_tx_rdy = mpc5125_psc_raw_tx_rdy,
975         .rx_rdy = mpc5125_psc_rx_rdy,
976         .tx_rdy = mpc5125_psc_tx_rdy,
977         .tx_empty = mpc5125_psc_tx_empty,
978         .stop_rx = mpc5125_psc_stop_rx,
979         .start_tx = mpc5125_psc_start_tx,
980         .stop_tx = mpc5125_psc_stop_tx,
981         .rx_clr_irq = mpc5125_psc_rx_clr_irq,
982         .tx_clr_irq = mpc5125_psc_tx_clr_irq,
983         .write_char = mpc5125_psc_write_char,
984         .read_char = mpc5125_psc_read_char,
985         .cw_disable_ints = mpc5125_psc_cw_disable_ints,
986         .cw_restore_ints = mpc5125_psc_cw_restore_ints,
987         .set_baudrate = mpc5125_psc_set_baudrate,
988         .clock_alloc = mpc512x_psc_alloc_clock,
989         .clock_relse = mpc512x_psc_relse_clock,
990         .clock = mpc512x_psc_endis_clock,
991         .fifoc_init = mpc512x_psc_fifoc_init,
992         .fifoc_uninit = mpc512x_psc_fifoc_uninit,
993         .get_irq = mpc512x_psc_get_irq,
994         .handle_irq = mpc512x_psc_handle_irq,
995         .get_status = mpc5125_psc_get_status,
996         .get_ipcr = mpc5125_psc_get_ipcr,
997         .command = mpc5125_psc_command,
998         .set_mode = mpc5125_psc_set_mode,
999         .set_rts = mpc5125_psc_set_rts,
1000         .enable_ms = mpc5125_psc_enable_ms,
1001         .set_sicr = mpc5125_psc_set_sicr,
1002         .set_imr = mpc5125_psc_set_imr,
1003         .get_mr1 = mpc5125_psc_get_mr1,
1004 };
1005 
1006 static struct psc_ops mpc512x_psc_ops = {
1007         .fifo_init = mpc512x_psc_fifo_init,
1008         .raw_rx_rdy = mpc512x_psc_raw_rx_rdy,
1009         .raw_tx_rdy = mpc512x_psc_raw_tx_rdy,
1010         .rx_rdy = mpc512x_psc_rx_rdy,
1011         .tx_rdy = mpc512x_psc_tx_rdy,
1012         .tx_empty = mpc512x_psc_tx_empty,
1013         .stop_rx = mpc512x_psc_stop_rx,
1014         .start_tx = mpc512x_psc_start_tx,
1015         .stop_tx = mpc512x_psc_stop_tx,
1016         .rx_clr_irq = mpc512x_psc_rx_clr_irq,
1017         .tx_clr_irq = mpc512x_psc_tx_clr_irq,
1018         .write_char = mpc512x_psc_write_char,
1019         .read_char = mpc512x_psc_read_char,
1020         .cw_disable_ints = mpc512x_psc_cw_disable_ints,
1021         .cw_restore_ints = mpc512x_psc_cw_restore_ints,
1022         .set_baudrate = mpc512x_psc_set_baudrate,
1023         .clock_alloc = mpc512x_psc_alloc_clock,
1024         .clock_relse = mpc512x_psc_relse_clock,
1025         .clock = mpc512x_psc_endis_clock,
1026         .fifoc_init = mpc512x_psc_fifoc_init,
1027         .fifoc_uninit = mpc512x_psc_fifoc_uninit,
1028         .get_irq = mpc512x_psc_get_irq,
1029         .handle_irq = mpc512x_psc_handle_irq,
1030         .get_status = mpc52xx_psc_get_status,
1031         .get_ipcr = mpc52xx_psc_get_ipcr,
1032         .command = mpc52xx_psc_command,
1033         .set_mode = mpc52xx_psc_set_mode,
1034         .set_rts = mpc52xx_psc_set_rts,
1035         .enable_ms = mpc52xx_psc_enable_ms,
1036         .set_sicr = mpc52xx_psc_set_sicr,
1037         .set_imr = mpc52xx_psc_set_imr,
1038         .get_mr1 = mpc52xx_psc_get_mr1,
1039 };
1040 #endif /* CONFIG_PPC_MPC512x */
1041 
1042 
1043 static const struct psc_ops *psc_ops;
1044 
1045 /* ======================================================================== */
1046 /* UART operations                                                          */
1047 /* ======================================================================== */
1048 
1049 static unsigned int
1050 mpc52xx_uart_tx_empty(struct uart_port *port)
1051 {
1052         return psc_ops->tx_empty(port) ? TIOCSER_TEMT : 0;
1053 }
1054 
1055 static void
1056 mpc52xx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
1057 {
1058         psc_ops->set_rts(port, mctrl & TIOCM_RTS);
1059 }
1060 
1061 static unsigned int
1062 mpc52xx_uart_get_mctrl(struct uart_port *port)
1063 {
1064         unsigned int ret = TIOCM_DSR;
1065         u8 status = psc_ops->get_ipcr(port);
1066 
1067         if (!(status & MPC52xx_PSC_CTS))
1068                 ret |= TIOCM_CTS;
1069         if (!(status & MPC52xx_PSC_DCD))
1070                 ret |= TIOCM_CAR;
1071 
1072         return ret;
1073 }
1074 
1075 static void
1076 mpc52xx_uart_stop_tx(struct uart_port *port)
1077 {
1078         /* port->lock taken by caller */
1079         psc_ops->stop_tx(port);
1080 }
1081 
1082 static void
1083 mpc52xx_uart_start_tx(struct uart_port *port)
1084 {
1085         /* port->lock taken by caller */
1086         psc_ops->start_tx(port);
1087 }
1088 
1089 static void
1090 mpc52xx_uart_send_xchar(struct uart_port *port, char ch)
1091 {
1092         unsigned long flags;
1093         spin_lock_irqsave(&port->lock, flags);
1094 
1095         port->x_char = ch;
1096         if (ch) {
1097                 /* Make sure tx interrupts are on */
1098                 /* Truly necessary ??? They should be anyway */
1099                 psc_ops->start_tx(port);
1100         }
1101 
1102         spin_unlock_irqrestore(&port->lock, flags);
1103 }
1104 
1105 static void
1106 mpc52xx_uart_stop_rx(struct uart_port *port)
1107 {
1108         /* port->lock taken by caller */
1109         psc_ops->stop_rx(port);
1110 }
1111 
1112 static void
1113 mpc52xx_uart_enable_ms(struct uart_port *port)
1114 {
1115         psc_ops->enable_ms(port);
1116 }
1117 
1118 static void
1119 mpc52xx_uart_break_ctl(struct uart_port *port, int ctl)
1120 {
1121         unsigned long flags;
1122         spin_lock_irqsave(&port->lock, flags);
1123 
1124         if (ctl == -1)
1125                 psc_ops->command(port, MPC52xx_PSC_START_BRK);
1126         else
1127                 psc_ops->command(port, MPC52xx_PSC_STOP_BRK);
1128 
1129         spin_unlock_irqrestore(&port->lock, flags);
1130 }
1131 
1132 static int
1133 mpc52xx_uart_startup(struct uart_port *port)
1134 {
1135         int ret;
1136 
1137         if (psc_ops->clock) {
1138                 ret = psc_ops->clock(port, 1);
1139                 if (ret)
1140                         return ret;
1141         }
1142 
1143         /* Request IRQ */
1144         ret = request_irq(port->irq, mpc52xx_uart_int,
1145                           port->irqflags, "mpc52xx_psc_uart", port);
1146         if (ret)
1147                 return ret;
1148 
1149         /* Reset/activate the port, clear and enable interrupts */
1150         psc_ops->command(port, MPC52xx_PSC_RST_RX);
1151         psc_ops->command(port, MPC52xx_PSC_RST_TX);
1152 
1153         psc_ops->set_sicr(port, 0);     /* UART mode DCD ignored */
1154 
1155         psc_ops->fifo_init(port);
1156 
1157         psc_ops->command(port, MPC52xx_PSC_TX_ENABLE);
1158         psc_ops->command(port, MPC52xx_PSC_RX_ENABLE);
1159 
1160         return 0;
1161 }
1162 
1163 static void
1164 mpc52xx_uart_shutdown(struct uart_port *port)
1165 {
1166         /* Shut down the port.  Leave TX active if on a console port */
1167         psc_ops->command(port, MPC52xx_PSC_RST_RX);
1168         if (!uart_console(port))
1169                 psc_ops->command(port, MPC52xx_PSC_RST_TX);
1170 
1171         port->read_status_mask = 0;
1172         psc_ops->set_imr(port, port->read_status_mask);
1173 
1174         if (psc_ops->clock)
1175                 psc_ops->clock(port, 0);
1176 
1177         /* Disable interrupt */
1178         psc_ops->cw_disable_ints(port);
1179 
1180         /* Release interrupt */
1181         free_irq(port->irq, port);
1182 }
1183 
1184 static void
1185 mpc52xx_uart_set_termios(struct uart_port *port, struct ktermios *new,
1186                          struct ktermios *old)
1187 {
1188         unsigned long flags;
1189         unsigned char mr1, mr2;
1190         unsigned int j;
1191         unsigned int baud;
1192 
1193         /* Prepare what we're gonna write */
1194         mr1 = 0;
1195 
1196         switch (new->c_cflag & CSIZE) {
1197         case CS5:       mr1 |= MPC52xx_PSC_MODE_5_BITS;
1198                 break;
1199         case CS6:       mr1 |= MPC52xx_PSC_MODE_6_BITS;
1200                 break;
1201         case CS7:       mr1 |= MPC52xx_PSC_MODE_7_BITS;
1202                 break;
1203         case CS8:
1204         default:        mr1 |= MPC52xx_PSC_MODE_8_BITS;
1205         }
1206 
1207         if (new->c_cflag & PARENB) {
1208                 if (new->c_cflag & CMSPAR)
1209                         mr1 |= MPC52xx_PSC_MODE_PARFORCE;
1210 
1211                 /* With CMSPAR, PARODD also means high parity (same as termios) */
1212                 mr1 |= (new->c_cflag & PARODD) ?
1213                         MPC52xx_PSC_MODE_PARODD : MPC52xx_PSC_MODE_PAREVEN;
1214         } else {
1215                 mr1 |= MPC52xx_PSC_MODE_PARNONE;
1216         }
1217 
1218         mr2 = 0;
1219 
1220         if (new->c_cflag & CSTOPB)
1221                 mr2 |= MPC52xx_PSC_MODE_TWO_STOP;
1222         else
1223                 mr2 |= ((new->c_cflag & CSIZE) == CS5) ?
1224                         MPC52xx_PSC_MODE_ONE_STOP_5_BITS :
1225                         MPC52xx_PSC_MODE_ONE_STOP;
1226 
1227         if (new->c_cflag & CRTSCTS) {
1228                 mr1 |= MPC52xx_PSC_MODE_RXRTS;
1229                 mr2 |= MPC52xx_PSC_MODE_TXCTS;
1230         }
1231 
1232         /* Get the lock */
1233         spin_lock_irqsave(&port->lock, flags);
1234 
1235         /* Do our best to flush TX & RX, so we don't lose anything */
1236         /* But we don't wait indefinitely ! */
1237         j = 5000000;    /* Maximum wait */
1238         /* FIXME Can't receive chars since set_termios might be called at early
1239          * boot for the console, all stuff is not yet ready to receive at that
1240          * time and that just makes the kernel oops */
1241         /* while (j-- && mpc52xx_uart_int_rx_chars(port)); */
1242         while (!mpc52xx_uart_tx_empty(port) && --j)
1243                 udelay(1);
1244 
1245         if (!j)
1246                 printk(KERN_ERR "mpc52xx_uart.c: "
1247                         "Unable to flush RX & TX fifos in-time in set_termios."
1248                         "Some chars may have been lost.\n");
1249 
1250         /* Reset the TX & RX */
1251         psc_ops->command(port, MPC52xx_PSC_RST_RX);
1252         psc_ops->command(port, MPC52xx_PSC_RST_TX);
1253 
1254         /* Send new mode settings */
1255         psc_ops->set_mode(port, mr1, mr2);
1256         baud = psc_ops->set_baudrate(port, new, old);
1257 
1258         /* Update the per-port timeout */
1259         uart_update_timeout(port, new->c_cflag, baud);
1260 
1261         if (UART_ENABLE_MS(port, new->c_cflag))
1262                 mpc52xx_uart_enable_ms(port);
1263 
1264         /* Reenable TX & RX */
1265         psc_ops->command(port, MPC52xx_PSC_TX_ENABLE);
1266         psc_ops->command(port, MPC52xx_PSC_RX_ENABLE);
1267 
1268         /* We're all set, release the lock */
1269         spin_unlock_irqrestore(&port->lock, flags);
1270 }
1271 
1272 static const char *
1273 mpc52xx_uart_type(struct uart_port *port)
1274 {
1275         /*
1276          * We keep using PORT_MPC52xx for historic reasons although it applies
1277          * for MPC512x, too, but print "MPC5xxx" to not irritate users
1278          */
1279         return port->type == PORT_MPC52xx ? "MPC5xxx PSC" : NULL;
1280 }
1281 
1282 static void
1283 mpc52xx_uart_release_port(struct uart_port *port)
1284 {
1285         if (psc_ops->clock_relse)
1286                 psc_ops->clock_relse(port);
1287 
1288         /* remapped by us ? */
1289         if (port->flags & UPF_IOREMAP) {
1290                 iounmap(port->membase);
1291                 port->membase = NULL;
1292         }
1293 
1294         release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc));
1295 }
1296 
1297 static int
1298 mpc52xx_uart_request_port(struct uart_port *port)
1299 {
1300         int err;
1301 
1302         if (port->flags & UPF_IOREMAP) /* Need to remap ? */
1303                 port->membase = ioremap(port->mapbase,
1304                                         sizeof(struct mpc52xx_psc));
1305 
1306         if (!port->membase)
1307                 return -EINVAL;
1308 
1309         err = request_mem_region(port->mapbase, sizeof(struct mpc52xx_psc),
1310                         "mpc52xx_psc_uart") != NULL ? 0 : -EBUSY;
1311 
1312         if (err)
1313                 goto out_membase;
1314 
1315         if (psc_ops->clock_alloc) {
1316                 err = psc_ops->clock_alloc(port);
1317                 if (err)
1318                         goto out_mapregion;
1319         }
1320 
1321         return 0;
1322 
1323 out_mapregion:
1324         release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc));
1325 out_membase:
1326         if (port->flags & UPF_IOREMAP) {
1327                 iounmap(port->membase);
1328                 port->membase = NULL;
1329         }
1330         return err;
1331 }
1332 
1333 static void
1334 mpc52xx_uart_config_port(struct uart_port *port, int flags)
1335 {
1336         if ((flags & UART_CONFIG_TYPE)
1337                 && (mpc52xx_uart_request_port(port) == 0))
1338                 port->type = PORT_MPC52xx;
1339 }
1340 
1341 static int
1342 mpc52xx_uart_verify_port(struct uart_port *port, struct serial_struct *ser)
1343 {
1344         if (ser->type != PORT_UNKNOWN && ser->type != PORT_MPC52xx)
1345                 return -EINVAL;
1346 
1347         if ((ser->irq != port->irq) ||
1348             (ser->io_type != UPIO_MEM) ||
1349             (ser->baud_base != port->uartclk)  ||
1350             (ser->iomem_base != (void *)port->mapbase) ||
1351             (ser->hub6 != 0))
1352                 return -EINVAL;
1353 
1354         return 0;
1355 }
1356 
1357 
1358 static struct uart_ops mpc52xx_uart_ops = {
1359         .tx_empty       = mpc52xx_uart_tx_empty,
1360         .set_mctrl      = mpc52xx_uart_set_mctrl,
1361         .get_mctrl      = mpc52xx_uart_get_mctrl,
1362         .stop_tx        = mpc52xx_uart_stop_tx,
1363         .start_tx       = mpc52xx_uart_start_tx,
1364         .send_xchar     = mpc52xx_uart_send_xchar,
1365         .stop_rx        = mpc52xx_uart_stop_rx,
1366         .enable_ms      = mpc52xx_uart_enable_ms,
1367         .break_ctl      = mpc52xx_uart_break_ctl,
1368         .startup        = mpc52xx_uart_startup,
1369         .shutdown       = mpc52xx_uart_shutdown,
1370         .set_termios    = mpc52xx_uart_set_termios,
1371 /*      .pm             = mpc52xx_uart_pm,              Not supported yet */
1372         .type           = mpc52xx_uart_type,
1373         .release_port   = mpc52xx_uart_release_port,
1374         .request_port   = mpc52xx_uart_request_port,
1375         .config_port    = mpc52xx_uart_config_port,
1376         .verify_port    = mpc52xx_uart_verify_port
1377 };
1378 
1379 
1380 /* ======================================================================== */
1381 /* Interrupt handling                                                       */
1382 /* ======================================================================== */
1383 
1384 static inline int
1385 mpc52xx_uart_int_rx_chars(struct uart_port *port)
1386 {
1387         struct tty_port *tport = &port->state->port;
1388         unsigned char ch, flag;
1389         unsigned short status;
1390 
1391         /* While we can read, do so ! */
1392         while (psc_ops->raw_rx_rdy(port)) {
1393                 /* Get the char */
1394                 ch = psc_ops->read_char(port);
1395 
1396                 /* Handle sysreq char */
1397 #ifdef SUPPORT_SYSRQ
1398                 if (uart_handle_sysrq_char(port, ch)) {
1399                         port->sysrq = 0;
1400                         continue;
1401                 }
1402 #endif
1403 
1404                 /* Store it */
1405 
1406                 flag = TTY_NORMAL;
1407                 port->icount.rx++;
1408 
1409                 status = psc_ops->get_status(port);
1410 
1411                 if (status & (MPC52xx_PSC_SR_PE |
1412                               MPC52xx_PSC_SR_FE |
1413                               MPC52xx_PSC_SR_RB)) {
1414 
1415                         if (status & MPC52xx_PSC_SR_RB) {
1416                                 flag = TTY_BREAK;
1417                                 uart_handle_break(port);
1418                                 port->icount.brk++;
1419                         } else if (status & MPC52xx_PSC_SR_PE) {
1420                                 flag = TTY_PARITY;
1421                                 port->icount.parity++;
1422                         }
1423                         else if (status & MPC52xx_PSC_SR_FE) {
1424                                 flag = TTY_FRAME;
1425                                 port->icount.frame++;
1426                         }
1427 
1428                         /* Clear error condition */
1429                         psc_ops->command(port, MPC52xx_PSC_RST_ERR_STAT);
1430 
1431                 }
1432                 tty_insert_flip_char(tport, ch, flag);
1433                 if (status & MPC52xx_PSC_SR_OE) {
1434                         /*
1435                          * Overrun is special, since it's
1436                          * reported immediately, and doesn't
1437                          * affect the current character
1438                          */
1439                         tty_insert_flip_char(tport, 0, TTY_OVERRUN);
1440                         port->icount.overrun++;
1441                 }
1442         }
1443 
1444         spin_unlock(&port->lock);
1445         tty_flip_buffer_push(tport);
1446         spin_lock(&port->lock);
1447 
1448         return psc_ops->raw_rx_rdy(port);
1449 }
1450 
1451 static inline int
1452 mpc52xx_uart_int_tx_chars(struct uart_port *port)
1453 {
1454         struct circ_buf *xmit = &port->state->xmit;
1455 
1456         /* Process out of band chars */
1457         if (port->x_char) {
1458                 psc_ops->write_char(port, port->x_char);
1459                 port->icount.tx++;
1460                 port->x_char = 0;
1461                 return 1;
1462         }
1463 
1464         /* Nothing to do ? */
1465         if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
1466                 mpc52xx_uart_stop_tx(port);
1467                 return 0;
1468         }
1469 
1470         /* Send chars */
1471         while (psc_ops->raw_tx_rdy(port)) {
1472                 psc_ops->write_char(port, xmit->buf[xmit->tail]);
1473                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
1474                 port->icount.tx++;
1475                 if (uart_circ_empty(xmit))
1476                         break;
1477         }
1478 
1479         /* Wake up */
1480         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
1481                 uart_write_wakeup(port);
1482 
1483         /* Maybe we're done after all */
1484         if (uart_circ_empty(xmit)) {
1485                 mpc52xx_uart_stop_tx(port);
1486                 return 0;
1487         }
1488 
1489         return 1;
1490 }
1491 
1492 static irqreturn_t
1493 mpc5xxx_uart_process_int(struct uart_port *port)
1494 {
1495         unsigned long pass = ISR_PASS_LIMIT;
1496         unsigned int keepgoing;
1497         u8 status;
1498 
1499         /* While we have stuff to do, we continue */
1500         do {
1501                 /* If we don't find anything to do, we stop */
1502                 keepgoing = 0;
1503 
1504                 psc_ops->rx_clr_irq(port);
1505                 if (psc_ops->rx_rdy(port))
1506                         keepgoing |= mpc52xx_uart_int_rx_chars(port);
1507 
1508                 psc_ops->tx_clr_irq(port);
1509                 if (psc_ops->tx_rdy(port))
1510                         keepgoing |= mpc52xx_uart_int_tx_chars(port);
1511 
1512                 status = psc_ops->get_ipcr(port);
1513                 if (status & MPC52xx_PSC_D_DCD)
1514                         uart_handle_dcd_change(port, !(status & MPC52xx_PSC_DCD));
1515 
1516                 if (status & MPC52xx_PSC_D_CTS)
1517                         uart_handle_cts_change(port, !(status & MPC52xx_PSC_CTS));
1518 
1519                 /* Limit number of iteration */
1520                 if (!(--pass))
1521                         keepgoing = 0;
1522 
1523         } while (keepgoing);
1524 
1525         return IRQ_HANDLED;
1526 }
1527 
1528 static irqreturn_t
1529 mpc52xx_uart_int(int irq, void *dev_id)
1530 {
1531         struct uart_port *port = dev_id;
1532         irqreturn_t ret;
1533 
1534         spin_lock(&port->lock);
1535 
1536         ret = psc_ops->handle_irq(port);
1537 
1538         spin_unlock(&port->lock);
1539 
1540         return ret;
1541 }
1542 
1543 /* ======================================================================== */
1544 /* Console ( if applicable )                                                */
1545 /* ======================================================================== */
1546 
1547 #ifdef CONFIG_SERIAL_MPC52xx_CONSOLE
1548 
1549 static void __init
1550 mpc52xx_console_get_options(struct uart_port *port,
1551                             int *baud, int *parity, int *bits, int *flow)
1552 {
1553         unsigned char mr1;
1554 
1555         pr_debug("mpc52xx_console_get_options(port=%p)\n", port);
1556 
1557         /* Read the mode registers */
1558         mr1 = psc_ops->get_mr1(port);
1559 
1560         /* CT{U,L}R are write-only ! */
1561         *baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
1562 
1563         /* Parse them */
1564         switch (mr1 & MPC52xx_PSC_MODE_BITS_MASK) {
1565         case MPC52xx_PSC_MODE_5_BITS:
1566                 *bits = 5;
1567                 break;
1568         case MPC52xx_PSC_MODE_6_BITS:
1569                 *bits = 6;
1570                 break;
1571         case MPC52xx_PSC_MODE_7_BITS:
1572                 *bits = 7;
1573                 break;
1574         case MPC52xx_PSC_MODE_8_BITS:
1575         default:
1576                 *bits = 8;
1577         }
1578 
1579         if (mr1 & MPC52xx_PSC_MODE_PARNONE)
1580                 *parity = 'n';
1581         else
1582                 *parity = mr1 & MPC52xx_PSC_MODE_PARODD ? 'o' : 'e';
1583 }
1584 
1585 static void
1586 mpc52xx_console_write(struct console *co, const char *s, unsigned int count)
1587 {
1588         struct uart_port *port = &mpc52xx_uart_ports[co->index];
1589         unsigned int i, j;
1590 
1591         /* Disable interrupts */
1592         psc_ops->cw_disable_ints(port);
1593 
1594         /* Wait the TX buffer to be empty */
1595         j = 5000000;    /* Maximum wait */
1596         while (!mpc52xx_uart_tx_empty(port) && --j)
1597                 udelay(1);
1598 
1599         /* Write all the chars */
1600         for (i = 0; i < count; i++, s++) {
1601                 /* Line return handling */
1602                 if (*s == '\n')
1603                         psc_ops->write_char(port, '\r');
1604 
1605                 /* Send the char */
1606                 psc_ops->write_char(port, *s);
1607 
1608                 /* Wait the TX buffer to be empty */
1609                 j = 20000;      /* Maximum wait */
1610                 while (!mpc52xx_uart_tx_empty(port) && --j)
1611                         udelay(1);
1612         }
1613 
1614         /* Restore interrupt state */
1615         psc_ops->cw_restore_ints(port);
1616 }
1617 
1618 
1619 static int __init
1620 mpc52xx_console_setup(struct console *co, char *options)
1621 {
1622         struct uart_port *port = &mpc52xx_uart_ports[co->index];
1623         struct device_node *np = mpc52xx_uart_nodes[co->index];
1624         unsigned int uartclk;
1625         struct resource res;
1626         int ret;
1627 
1628         int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
1629         int bits = 8;
1630         int parity = 'n';
1631         int flow = 'n';
1632 
1633         pr_debug("mpc52xx_console_setup co=%p, co->index=%i, options=%s\n",
1634                  co, co->index, options);
1635 
1636         if ((co->index < 0) || (co->index >= MPC52xx_PSC_MAXNUM)) {
1637                 pr_debug("PSC%x out of range\n", co->index);
1638                 return -EINVAL;
1639         }
1640 
1641         if (!np) {
1642                 pr_debug("PSC%x not found in device tree\n", co->index);
1643                 return -EINVAL;
1644         }
1645 
1646         pr_debug("Console on ttyPSC%x is %s\n",
1647                  co->index, mpc52xx_uart_nodes[co->index]->full_name);
1648 
1649         /* Fetch register locations */
1650         ret = of_address_to_resource(np, 0, &res);
1651         if (ret) {
1652                 pr_debug("Could not get resources for PSC%x\n", co->index);
1653                 return ret;
1654         }
1655 
1656         uartclk = mpc5xxx_get_bus_frequency(np);
1657         if (uartclk == 0) {
1658                 pr_debug("Could not find uart clock frequency!\n");
1659                 return -EINVAL;
1660         }
1661 
1662         /* Basic port init. Needed since we use some uart_??? func before
1663          * real init for early access */
1664         spin_lock_init(&port->lock);
1665         port->uartclk = uartclk;
1666         port->ops       = &mpc52xx_uart_ops;
1667         port->mapbase = res.start;
1668         port->membase = ioremap(res.start, sizeof(struct mpc52xx_psc));
1669         port->irq = irq_of_parse_and_map(np, 0);
1670 
1671         if (port->membase == NULL)
1672                 return -EINVAL;
1673 
1674         pr_debug("mpc52xx-psc uart at %p, mapped to %p, irq=%x, freq=%i\n",
1675                  (void *)port->mapbase, port->membase,
1676                  port->irq, port->uartclk);
1677 
1678         /* Setup the port parameters accoding to options */
1679         if (options)
1680                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1681         else
1682                 mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow);
1683 
1684         pr_debug("Setting console parameters: %i %i%c1 flow=%c\n",
1685                  baud, bits, parity, flow);
1686 
1687         return uart_set_options(port, co, baud, parity, bits, flow);
1688 }
1689 
1690 
1691 static struct uart_driver mpc52xx_uart_driver;
1692 
1693 static struct console mpc52xx_console = {
1694         .name   = "ttyPSC",
1695         .write  = mpc52xx_console_write,
1696         .device = uart_console_device,
1697         .setup  = mpc52xx_console_setup,
1698         .flags  = CON_PRINTBUFFER,
1699         .index  = -1,   /* Specified on the cmdline (e.g. console=ttyPSC0) */
1700         .data   = &mpc52xx_uart_driver,
1701 };
1702 
1703 
1704 static int __init
1705 mpc52xx_console_init(void)
1706 {
1707         mpc52xx_uart_of_enumerate();
1708         register_console(&mpc52xx_console);
1709         return 0;
1710 }
1711 
1712 console_initcall(mpc52xx_console_init);
1713 
1714 #define MPC52xx_PSC_CONSOLE &mpc52xx_console
1715 #else
1716 #define MPC52xx_PSC_CONSOLE NULL
1717 #endif
1718 
1719 
1720 /* ======================================================================== */
1721 /* UART Driver                                                              */
1722 /* ======================================================================== */
1723 
1724 static struct uart_driver mpc52xx_uart_driver = {
1725         .driver_name    = "mpc52xx_psc_uart",
1726         .dev_name       = "ttyPSC",
1727         .major          = SERIAL_PSC_MAJOR,
1728         .minor          = SERIAL_PSC_MINOR,
1729         .nr             = MPC52xx_PSC_MAXNUM,
1730         .cons           = MPC52xx_PSC_CONSOLE,
1731 };
1732 
1733 /* ======================================================================== */
1734 /* OF Platform Driver                                                       */
1735 /* ======================================================================== */
1736 
1737 static struct of_device_id mpc52xx_uart_of_match[] = {
1738 #ifdef CONFIG_PPC_MPC52xx
1739         { .compatible = "fsl,mpc5200b-psc-uart", .data = &mpc5200b_psc_ops, },
1740         { .compatible = "fsl,mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
1741         /* binding used by old lite5200 device trees: */
1742         { .compatible = "mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
1743         /* binding used by efika: */
1744         { .compatible = "mpc5200-serial", .data = &mpc52xx_psc_ops, },
1745 #endif
1746 #ifdef CONFIG_PPC_MPC512x
1747         { .compatible = "fsl,mpc5121-psc-uart", .data = &mpc512x_psc_ops, },
1748         { .compatible = "fsl,mpc5125-psc-uart", .data = &mpc5125_psc_ops, },
1749 #endif
1750         {},
1751 };
1752 
1753 static int mpc52xx_uart_of_probe(struct platform_device *op)
1754 {
1755         int idx = -1;
1756         unsigned int uartclk;
1757         struct uart_port *port = NULL;
1758         struct resource res;
1759         int ret;
1760 
1761         /* Check validity & presence */
1762         for (idx = 0; idx < MPC52xx_PSC_MAXNUM; idx++)
1763                 if (mpc52xx_uart_nodes[idx] == op->dev.of_node)
1764                         break;
1765         if (idx >= MPC52xx_PSC_MAXNUM)
1766                 return -EINVAL;
1767         pr_debug("Found %s assigned to ttyPSC%x\n",
1768                  mpc52xx_uart_nodes[idx]->full_name, idx);
1769 
1770         /* set the uart clock to the input clock of the psc, the different
1771          * prescalers are taken into account in the set_baudrate() methods
1772          * of the respective chip */
1773         uartclk = mpc5xxx_get_bus_frequency(op->dev.of_node);
1774         if (uartclk == 0) {
1775                 dev_dbg(&op->dev, "Could not find uart clock frequency!\n");
1776                 return -EINVAL;
1777         }
1778 
1779         /* Init the port structure */
1780         port = &mpc52xx_uart_ports[idx];
1781 
1782         spin_lock_init(&port->lock);
1783         port->uartclk = uartclk;
1784         port->fifosize  = 512;
1785         port->iotype    = UPIO_MEM;
1786         port->flags     = UPF_BOOT_AUTOCONF |
1787                           (uart_console(port) ? 0 : UPF_IOREMAP);
1788         port->line      = idx;
1789         port->ops       = &mpc52xx_uart_ops;
1790         port->dev       = &op->dev;
1791 
1792         /* Search for IRQ and mapbase */
1793         ret = of_address_to_resource(op->dev.of_node, 0, &res);
1794         if (ret)
1795                 return ret;
1796 
1797         port->mapbase = res.start;
1798         if (!port->mapbase) {
1799                 dev_dbg(&op->dev, "Could not allocate resources for PSC\n");
1800                 return -EINVAL;
1801         }
1802 
1803         psc_ops->get_irq(port, op->dev.of_node);
1804         if (port->irq == 0) {
1805                 dev_dbg(&op->dev, "Could not get irq\n");
1806                 return -EINVAL;
1807         }
1808 
1809         dev_dbg(&op->dev, "mpc52xx-psc uart at %p, irq=%x, freq=%i\n",
1810                 (void *)port->mapbase, port->irq, port->uartclk);
1811 
1812         /* Add the port to the uart sub-system */
1813         ret = uart_add_one_port(&mpc52xx_uart_driver, port);
1814         if (ret)
1815                 return ret;
1816 
1817         platform_set_drvdata(op, (void *)port);
1818         return 0;
1819 }
1820 
1821 static int
1822 mpc52xx_uart_of_remove(struct platform_device *op)
1823 {
1824         struct uart_port *port = platform_get_drvdata(op);
1825 
1826         if (port)
1827                 uart_remove_one_port(&mpc52xx_uart_driver, port);
1828 
1829         return 0;
1830 }
1831 
1832 #ifdef CONFIG_PM
1833 static int
1834 mpc52xx_uart_of_suspend(struct platform_device *op, pm_message_t state)
1835 {
1836         struct uart_port *port = platform_get_drvdata(op);
1837 
1838         if (port)
1839                 uart_suspend_port(&mpc52xx_uart_driver, port);
1840 
1841         return 0;
1842 }
1843 
1844 static int
1845 mpc52xx_uart_of_resume(struct platform_device *op)
1846 {
1847         struct uart_port *port = platform_get_drvdata(op);
1848 
1849         if (port)
1850                 uart_resume_port(&mpc52xx_uart_driver, port);
1851 
1852         return 0;
1853 }
1854 #endif
1855 
1856 static void
1857 mpc52xx_uart_of_assign(struct device_node *np)
1858 {
1859         int i;
1860 
1861         /* Find the first free PSC number */
1862         for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
1863                 if (mpc52xx_uart_nodes[i] == NULL) {
1864                         of_node_get(np);
1865                         mpc52xx_uart_nodes[i] = np;
1866                         return;
1867                 }
1868         }
1869 }
1870 
1871 static void
1872 mpc52xx_uart_of_enumerate(void)
1873 {
1874         static int enum_done;
1875         struct device_node *np;
1876         const struct  of_device_id *match;
1877         int i;
1878 
1879         if (enum_done)
1880                 return;
1881 
1882         /* Assign index to each PSC in device tree */
1883         for_each_matching_node(np, mpc52xx_uart_of_match) {
1884                 match = of_match_node(mpc52xx_uart_of_match, np);
1885                 psc_ops = match->data;
1886                 mpc52xx_uart_of_assign(np);
1887         }
1888 
1889         enum_done = 1;
1890 
1891         for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
1892                 if (mpc52xx_uart_nodes[i])
1893                         pr_debug("%s assigned to ttyPSC%x\n",
1894                                  mpc52xx_uart_nodes[i]->full_name, i);
1895         }
1896 }
1897 
1898 MODULE_DEVICE_TABLE(of, mpc52xx_uart_of_match);
1899 
1900 static struct platform_driver mpc52xx_uart_of_driver = {
1901         .probe          = mpc52xx_uart_of_probe,
1902         .remove         = mpc52xx_uart_of_remove,
1903 #ifdef CONFIG_PM
1904         .suspend        = mpc52xx_uart_of_suspend,
1905         .resume         = mpc52xx_uart_of_resume,
1906 #endif
1907         .driver = {
1908                 .name = "mpc52xx-psc-uart",
1909                 .owner = THIS_MODULE,
1910                 .of_match_table = mpc52xx_uart_of_match,
1911         },
1912 };
1913 
1914 
1915 /* ======================================================================== */
1916 /* Module                                                                   */
1917 /* ======================================================================== */
1918 
1919 static int __init
1920 mpc52xx_uart_init(void)
1921 {
1922         int ret;
1923 
1924         printk(KERN_INFO "Serial: MPC52xx PSC UART driver\n");
1925 
1926         ret = uart_register_driver(&mpc52xx_uart_driver);
1927         if (ret) {
1928                 printk(KERN_ERR "%s: uart_register_driver failed (%i)\n",
1929                        __FILE__, ret);
1930                 return ret;
1931         }
1932 
1933         mpc52xx_uart_of_enumerate();
1934 
1935         /*
1936          * Map the PSC FIFO Controller and init if on MPC512x.
1937          */
1938         if (psc_ops && psc_ops->fifoc_init) {
1939                 ret = psc_ops->fifoc_init();
1940                 if (ret)
1941                         goto err_init;
1942         }
1943 
1944         ret = platform_driver_register(&mpc52xx_uart_of_driver);
1945         if (ret) {
1946                 printk(KERN_ERR "%s: platform_driver_register failed (%i)\n",
1947                        __FILE__, ret);
1948                 goto err_reg;
1949         }
1950 
1951         return 0;
1952 err_reg:
1953         if (psc_ops && psc_ops->fifoc_uninit)
1954                 psc_ops->fifoc_uninit();
1955 err_init:
1956         uart_unregister_driver(&mpc52xx_uart_driver);
1957         return ret;
1958 }
1959 
1960 static void __exit
1961 mpc52xx_uart_exit(void)
1962 {
1963         if (psc_ops->fifoc_uninit)
1964                 psc_ops->fifoc_uninit();
1965 
1966         platform_driver_unregister(&mpc52xx_uart_of_driver);
1967         uart_unregister_driver(&mpc52xx_uart_driver);
1968 }
1969 
1970 
1971 module_init(mpc52xx_uart_init);
1972 module_exit(mpc52xx_uart_exit);
1973 
1974 MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
1975 MODULE_DESCRIPTION("Freescale MPC52xx PSC UART");
1976 MODULE_LICENSE("GPL");
1977 

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