1 // SPDX-License-Identifier: GPL-2.0
3 * Driver for the PSC of the Freescale MPC52xx PSCs configured as UARTs.
5 * FIXME According to the usermanual the status bits in the status register
6 * are only updated when the peripherals access the FIFO and not when the
7 * CPU access them. So since we use this bits to know when we stop writing
8 * and reading, they may not be updated in-time and a race condition may
9 * exists. But I haven't be able to prove this and I don't care. But if
10 * any problem arises, it might worth checking. The TX/RX FIFO Stats
11 * registers should be used in addition.
12 * Update: Actually, they seem updated ... At least the bits we use.
17 * Some of the code has been inspired/copied from the 2.4 code written
20 * Copyright (C) 2008 Freescale Semiconductor Inc.
22 * Added support for MPC5121
23 * Copyright (C) 2006 Secret Lab Technologies Ltd.
26 * Copyright (C) 2003 MontaVista, Software, Inc.
31 #include <linux/device.h>
32 #include <linux/module.h>
33 #include <linux/tty.h>
34 #include <linux/tty_flip.h>
35 #include <linux/serial.h>
36 #include <linux/sysrq.h>
37 #include <linux/console.h>
38 #include <linux/delay.h>
41 #include <linux/of_platform.h>
42 #include <linux/clk.h>
44 #include <asm/mpc52xx.h>
45 #include <asm/mpc52xx_psc.h>
47 #include <linux/serial_core.h>
50 /* We've been assigned a range on the "Low-density serial ports" major */
51 #define SERIAL_PSC_MAJOR 204
52 #define SERIAL_PSC_MINOR 148
55 #define ISR_PASS_LIMIT 256 /* Max number of iteration in the interrupt */
58 static struct uart_port mpc52xx_uart_ports[MPC52xx_PSC_MAXNUM];
59 /* Rem: - We use the read_status_mask as a shadow of
60 * psc->mpc52xx_psc_imr
61 * - It's important that is array is all zero on start as we
62 * use it to know if it's initialized or not ! If it's not sure
63 * it's cleared, then a memset(...,0,...) should be added to
67 /* lookup table for matching device nodes to index numbers */
68 static struct device_node *mpc52xx_uart_nodes[MPC52xx_PSC_MAXNUM];
70 static void mpc52xx_uart_of_enumerate(void);
73 #define PSC(port) ((struct mpc52xx_psc __iomem *)((port)->membase))
76 /* Forward declaration of the interruption handling routine */
77 static irqreturn_t mpc52xx_uart_int(int irq, void *dev_id);
78 static irqreturn_t mpc5xxx_uart_process_int(struct uart_port *port);
80 /* ======================================================================== */
81 /* PSC fifo operations for isolating differences between 52xx and 512x */
82 /* ======================================================================== */
85 void (*fifo_init)(struct uart_port *port);
86 int (*raw_rx_rdy)(struct uart_port *port);
87 int (*raw_tx_rdy)(struct uart_port *port);
88 int (*rx_rdy)(struct uart_port *port);
89 int (*tx_rdy)(struct uart_port *port);
90 int (*tx_empty)(struct uart_port *port);
91 void (*stop_rx)(struct uart_port *port);
92 void (*start_tx)(struct uart_port *port);
93 void (*stop_tx)(struct uart_port *port);
94 void (*rx_clr_irq)(struct uart_port *port);
95 void (*tx_clr_irq)(struct uart_port *port);
96 void (*write_char)(struct uart_port *port, unsigned char c);
97 unsigned char (*read_char)(struct uart_port *port);
98 void (*cw_disable_ints)(struct uart_port *port);
99 void (*cw_restore_ints)(struct uart_port *port);
100 unsigned int (*set_baudrate)(struct uart_port *port,
101 struct ktermios *new,
102 struct ktermios *old);
103 int (*clock_alloc)(struct uart_port *port);
104 void (*clock_relse)(struct uart_port *port);
105 int (*clock)(struct uart_port *port, int enable);
106 int (*fifoc_init)(void);
107 void (*fifoc_uninit)(void);
108 void (*get_irq)(struct uart_port *, struct device_node *);
109 irqreturn_t (*handle_irq)(struct uart_port *port);
110 u16 (*get_status)(struct uart_port *port);
111 u8 (*get_ipcr)(struct uart_port *port);
112 void (*command)(struct uart_port *port, u8 cmd);
113 void (*set_mode)(struct uart_port *port, u8 mr1, u8 mr2);
114 void (*set_rts)(struct uart_port *port, int state);
115 void (*enable_ms)(struct uart_port *port);
116 void (*set_sicr)(struct uart_port *port, u32 val);
117 void (*set_imr)(struct uart_port *port, u16 val);
118 u8 (*get_mr1)(struct uart_port *port);
121 /* setting the prescaler and divisor reg is common for all chips */
122 static inline void mpc52xx_set_divisor(struct mpc52xx_psc __iomem *psc,
123 u16 prescaler, unsigned int divisor)
125 /* select prescaler */
126 out_be16(&psc->mpc52xx_psc_clock_select, prescaler);
127 out_8(&psc->ctur, divisor >> 8);
128 out_8(&psc->ctlr, divisor & 0xff);
131 static u16 mpc52xx_psc_get_status(struct uart_port *port)
133 return in_be16(&PSC(port)->mpc52xx_psc_status);
136 static u8 mpc52xx_psc_get_ipcr(struct uart_port *port)
138 return in_8(&PSC(port)->mpc52xx_psc_ipcr);
141 static void mpc52xx_psc_command(struct uart_port *port, u8 cmd)
143 out_8(&PSC(port)->command, cmd);
146 static void mpc52xx_psc_set_mode(struct uart_port *port, u8 mr1, u8 mr2)
148 out_8(&PSC(port)->command, MPC52xx_PSC_SEL_MODE_REG_1);
149 out_8(&PSC(port)->mode, mr1);
150 out_8(&PSC(port)->mode, mr2);
153 static void mpc52xx_psc_set_rts(struct uart_port *port, int state)
156 out_8(&PSC(port)->op1, MPC52xx_PSC_OP_RTS);
158 out_8(&PSC(port)->op0, MPC52xx_PSC_OP_RTS);
161 static void mpc52xx_psc_enable_ms(struct uart_port *port)
163 struct mpc52xx_psc __iomem *psc = PSC(port);
165 /* clear D_*-bits by reading them */
166 in_8(&psc->mpc52xx_psc_ipcr);
167 /* enable CTS and DCD as IPC interrupts */
168 out_8(&psc->mpc52xx_psc_acr, MPC52xx_PSC_IEC_CTS | MPC52xx_PSC_IEC_DCD);
170 port->read_status_mask |= MPC52xx_PSC_IMR_IPC;
171 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
174 static void mpc52xx_psc_set_sicr(struct uart_port *port, u32 val)
176 out_be32(&PSC(port)->sicr, val);
179 static void mpc52xx_psc_set_imr(struct uart_port *port, u16 val)
181 out_be16(&PSC(port)->mpc52xx_psc_imr, val);
184 static u8 mpc52xx_psc_get_mr1(struct uart_port *port)
186 out_8(&PSC(port)->command, MPC52xx_PSC_SEL_MODE_REG_1);
187 return in_8(&PSC(port)->mode);
190 #ifdef CONFIG_PPC_MPC52xx
191 #define FIFO_52xx(port) ((struct mpc52xx_psc_fifo __iomem *)(PSC(port)+1))
192 static void mpc52xx_psc_fifo_init(struct uart_port *port)
194 struct mpc52xx_psc __iomem *psc = PSC(port);
195 struct mpc52xx_psc_fifo __iomem *fifo = FIFO_52xx(port);
197 out_8(&fifo->rfcntl, 0x00);
198 out_be16(&fifo->rfalarm, 0x1ff);
199 out_8(&fifo->tfcntl, 0x07);
200 out_be16(&fifo->tfalarm, 0x80);
202 port->read_status_mask |= MPC52xx_PSC_IMR_RXRDY | MPC52xx_PSC_IMR_TXRDY;
203 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
206 static int mpc52xx_psc_raw_rx_rdy(struct uart_port *port)
208 return in_be16(&PSC(port)->mpc52xx_psc_status)
209 & MPC52xx_PSC_SR_RXRDY;
212 static int mpc52xx_psc_raw_tx_rdy(struct uart_port *port)
214 return in_be16(&PSC(port)->mpc52xx_psc_status)
215 & MPC52xx_PSC_SR_TXRDY;
219 static int mpc52xx_psc_rx_rdy(struct uart_port *port)
221 return in_be16(&PSC(port)->mpc52xx_psc_isr)
222 & port->read_status_mask
223 & MPC52xx_PSC_IMR_RXRDY;
226 static int mpc52xx_psc_tx_rdy(struct uart_port *port)
228 return in_be16(&PSC(port)->mpc52xx_psc_isr)
229 & port->read_status_mask
230 & MPC52xx_PSC_IMR_TXRDY;
233 static int mpc52xx_psc_tx_empty(struct uart_port *port)
235 u16 sts = in_be16(&PSC(port)->mpc52xx_psc_status);
237 return (sts & MPC52xx_PSC_SR_TXEMP) ? TIOCSER_TEMT : 0;
240 static void mpc52xx_psc_start_tx(struct uart_port *port)
242 port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY;
243 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
246 static void mpc52xx_psc_stop_tx(struct uart_port *port)
248 port->read_status_mask &= ~MPC52xx_PSC_IMR_TXRDY;
249 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
252 static void mpc52xx_psc_stop_rx(struct uart_port *port)
254 port->read_status_mask &= ~MPC52xx_PSC_IMR_RXRDY;
255 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
258 static void mpc52xx_psc_rx_clr_irq(struct uart_port *port)
262 static void mpc52xx_psc_tx_clr_irq(struct uart_port *port)
266 static void mpc52xx_psc_write_char(struct uart_port *port, unsigned char c)
268 out_8(&PSC(port)->mpc52xx_psc_buffer_8, c);
271 static unsigned char mpc52xx_psc_read_char(struct uart_port *port)
273 return in_8(&PSC(port)->mpc52xx_psc_buffer_8);
276 static void mpc52xx_psc_cw_disable_ints(struct uart_port *port)
278 out_be16(&PSC(port)->mpc52xx_psc_imr, 0);
281 static void mpc52xx_psc_cw_restore_ints(struct uart_port *port)
283 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
286 static unsigned int mpc5200_psc_set_baudrate(struct uart_port *port,
287 struct ktermios *new,
288 struct ktermios *old)
291 unsigned int divisor;
293 /* The 5200 has a fixed /32 prescaler, uartclk contains the ipb freq */
294 baud = uart_get_baud_rate(port, new, old,
295 port->uartclk / (32 * 0xffff) + 1,
297 divisor = (port->uartclk + 16 * baud) / (32 * baud);
299 /* enable the /32 prescaler and set the divisor */
300 mpc52xx_set_divisor(PSC(port), 0xdd00, divisor);
304 static unsigned int mpc5200b_psc_set_baudrate(struct uart_port *port,
305 struct ktermios *new,
306 struct ktermios *old)
309 unsigned int divisor;
312 /* The 5200B has a selectable /4 or /32 prescaler, uartclk contains the
314 baud = uart_get_baud_rate(port, new, old,
315 port->uartclk / (32 * 0xffff) + 1,
317 divisor = (port->uartclk + 2 * baud) / (4 * baud);
319 /* select the proper prescaler and set the divisor
320 * prefer high prescaler for more tolerance on low baudrates */
321 if (divisor > 0xffff || baud <= 115200) {
322 divisor = (divisor + 4) / 8;
323 prescaler = 0xdd00; /* /32 */
325 prescaler = 0xff00; /* /4 */
326 mpc52xx_set_divisor(PSC(port), prescaler, divisor);
330 static void mpc52xx_psc_get_irq(struct uart_port *port, struct device_node *np)
333 port->irq = irq_of_parse_and_map(np, 0);
336 /* 52xx specific interrupt handler. The caller holds the port lock */
337 static irqreturn_t mpc52xx_psc_handle_irq(struct uart_port *port)
339 return mpc5xxx_uart_process_int(port);
342 static const struct psc_ops mpc52xx_psc_ops = {
343 .fifo_init = mpc52xx_psc_fifo_init,
344 .raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
345 .raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
346 .rx_rdy = mpc52xx_psc_rx_rdy,
347 .tx_rdy = mpc52xx_psc_tx_rdy,
348 .tx_empty = mpc52xx_psc_tx_empty,
349 .stop_rx = mpc52xx_psc_stop_rx,
350 .start_tx = mpc52xx_psc_start_tx,
351 .stop_tx = mpc52xx_psc_stop_tx,
352 .rx_clr_irq = mpc52xx_psc_rx_clr_irq,
353 .tx_clr_irq = mpc52xx_psc_tx_clr_irq,
354 .write_char = mpc52xx_psc_write_char,
355 .read_char = mpc52xx_psc_read_char,
356 .cw_disable_ints = mpc52xx_psc_cw_disable_ints,
357 .cw_restore_ints = mpc52xx_psc_cw_restore_ints,
358 .set_baudrate = mpc5200_psc_set_baudrate,
359 .get_irq = mpc52xx_psc_get_irq,
360 .handle_irq = mpc52xx_psc_handle_irq,
361 .get_status = mpc52xx_psc_get_status,
362 .get_ipcr = mpc52xx_psc_get_ipcr,
363 .command = mpc52xx_psc_command,
364 .set_mode = mpc52xx_psc_set_mode,
365 .set_rts = mpc52xx_psc_set_rts,
366 .enable_ms = mpc52xx_psc_enable_ms,
367 .set_sicr = mpc52xx_psc_set_sicr,
368 .set_imr = mpc52xx_psc_set_imr,
369 .get_mr1 = mpc52xx_psc_get_mr1,
372 static const struct psc_ops mpc5200b_psc_ops = {
373 .fifo_init = mpc52xx_psc_fifo_init,
374 .raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
375 .raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
376 .rx_rdy = mpc52xx_psc_rx_rdy,
377 .tx_rdy = mpc52xx_psc_tx_rdy,
378 .tx_empty = mpc52xx_psc_tx_empty,
379 .stop_rx = mpc52xx_psc_stop_rx,
380 .start_tx = mpc52xx_psc_start_tx,
381 .stop_tx = mpc52xx_psc_stop_tx,
382 .rx_clr_irq = mpc52xx_psc_rx_clr_irq,
383 .tx_clr_irq = mpc52xx_psc_tx_clr_irq,
384 .write_char = mpc52xx_psc_write_char,
385 .read_char = mpc52xx_psc_read_char,
386 .cw_disable_ints = mpc52xx_psc_cw_disable_ints,
387 .cw_restore_ints = mpc52xx_psc_cw_restore_ints,
388 .set_baudrate = mpc5200b_psc_set_baudrate,
389 .get_irq = mpc52xx_psc_get_irq,
390 .handle_irq = mpc52xx_psc_handle_irq,
391 .get_status = mpc52xx_psc_get_status,
392 .get_ipcr = mpc52xx_psc_get_ipcr,
393 .command = mpc52xx_psc_command,
394 .set_mode = mpc52xx_psc_set_mode,
395 .set_rts = mpc52xx_psc_set_rts,
396 .enable_ms = mpc52xx_psc_enable_ms,
397 .set_sicr = mpc52xx_psc_set_sicr,
398 .set_imr = mpc52xx_psc_set_imr,
399 .get_mr1 = mpc52xx_psc_get_mr1,
402 #endif /* CONFIG_PPC_MPC52xx */
404 #ifdef CONFIG_PPC_MPC512x
405 #define FIFO_512x(port) ((struct mpc512x_psc_fifo __iomem *)(PSC(port)+1))
407 /* PSC FIFO Controller for mpc512x */
416 static struct psc_fifoc __iomem *psc_fifoc;
417 static unsigned int psc_fifoc_irq;
418 static struct clk *psc_fifoc_clk;
420 static void mpc512x_psc_fifo_init(struct uart_port *port)
423 out_be16(&PSC(port)->mpc52xx_psc_clock_select, 0xdd00);
425 out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_RESET_SLICE);
426 out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
427 out_be32(&FIFO_512x(port)->txalarm, 1);
428 out_be32(&FIFO_512x(port)->tximr, 0);
430 out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_RESET_SLICE);
431 out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
432 out_be32(&FIFO_512x(port)->rxalarm, 1);
433 out_be32(&FIFO_512x(port)->rximr, 0);
435 out_be32(&FIFO_512x(port)->tximr, MPC512x_PSC_FIFO_ALARM);
436 out_be32(&FIFO_512x(port)->rximr, MPC512x_PSC_FIFO_ALARM);
439 static int mpc512x_psc_raw_rx_rdy(struct uart_port *port)
441 return !(in_be32(&FIFO_512x(port)->rxsr) & MPC512x_PSC_FIFO_EMPTY);
444 static int mpc512x_psc_raw_tx_rdy(struct uart_port *port)
446 return !(in_be32(&FIFO_512x(port)->txsr) & MPC512x_PSC_FIFO_FULL);
449 static int mpc512x_psc_rx_rdy(struct uart_port *port)
451 return in_be32(&FIFO_512x(port)->rxsr)
452 & in_be32(&FIFO_512x(port)->rximr)
453 & MPC512x_PSC_FIFO_ALARM;
456 static int mpc512x_psc_tx_rdy(struct uart_port *port)
458 return in_be32(&FIFO_512x(port)->txsr)
459 & in_be32(&FIFO_512x(port)->tximr)
460 & MPC512x_PSC_FIFO_ALARM;
463 static int mpc512x_psc_tx_empty(struct uart_port *port)
465 return in_be32(&FIFO_512x(port)->txsr)
466 & MPC512x_PSC_FIFO_EMPTY;
469 static void mpc512x_psc_stop_rx(struct uart_port *port)
471 unsigned long rx_fifo_imr;
473 rx_fifo_imr = in_be32(&FIFO_512x(port)->rximr);
474 rx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
475 out_be32(&FIFO_512x(port)->rximr, rx_fifo_imr);
478 static void mpc512x_psc_start_tx(struct uart_port *port)
480 unsigned long tx_fifo_imr;
482 tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
483 tx_fifo_imr |= MPC512x_PSC_FIFO_ALARM;
484 out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
487 static void mpc512x_psc_stop_tx(struct uart_port *port)
489 unsigned long tx_fifo_imr;
491 tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
492 tx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
493 out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
496 static void mpc512x_psc_rx_clr_irq(struct uart_port *port)
498 out_be32(&FIFO_512x(port)->rxisr, in_be32(&FIFO_512x(port)->rxisr));
501 static void mpc512x_psc_tx_clr_irq(struct uart_port *port)
503 out_be32(&FIFO_512x(port)->txisr, in_be32(&FIFO_512x(port)->txisr));
506 static void mpc512x_psc_write_char(struct uart_port *port, unsigned char c)
508 out_8(&FIFO_512x(port)->txdata_8, c);
511 static unsigned char mpc512x_psc_read_char(struct uart_port *port)
513 return in_8(&FIFO_512x(port)->rxdata_8);
516 static void mpc512x_psc_cw_disable_ints(struct uart_port *port)
518 port->read_status_mask =
519 in_be32(&FIFO_512x(port)->tximr) << 16 |
520 in_be32(&FIFO_512x(port)->rximr);
521 out_be32(&FIFO_512x(port)->tximr, 0);
522 out_be32(&FIFO_512x(port)->rximr, 0);
525 static void mpc512x_psc_cw_restore_ints(struct uart_port *port)
527 out_be32(&FIFO_512x(port)->tximr,
528 (port->read_status_mask >> 16) & 0x7f);
529 out_be32(&FIFO_512x(port)->rximr, port->read_status_mask & 0x7f);
532 static unsigned int mpc512x_psc_set_baudrate(struct uart_port *port,
533 struct ktermios *new,
534 struct ktermios *old)
537 unsigned int divisor;
540 * The "MPC5121e Microcontroller Reference Manual, Rev. 3" says on
541 * pg. 30-10 that the chip supports a /32 and a /10 prescaler.
542 * Furthermore, it states that "After reset, the prescaler by 10
543 * for the UART mode is selected", but the reset register value is
544 * 0x0000 which means a /32 prescaler. This is wrong.
546 * In reality using /32 prescaler doesn't work, as it is not supported!
547 * Use /16 or /10 prescaler, see "MPC5121e Hardware Design Guide",
548 * Chapter 4.1 PSC in UART Mode.
549 * Calculate with a /16 prescaler here.
552 /* uartclk contains the ips freq */
553 baud = uart_get_baud_rate(port, new, old,
554 port->uartclk / (16 * 0xffff) + 1,
556 divisor = (port->uartclk + 8 * baud) / (16 * baud);
558 /* enable the /16 prescaler and set the divisor */
559 mpc52xx_set_divisor(PSC(port), 0xdd00, divisor);
563 /* Init PSC FIFO Controller */
564 static int __init mpc512x_psc_fifoc_init(void)
567 struct device_node *np;
570 /* default error code, potentially overwritten by clock calls */
573 np = of_find_compatible_node(NULL, NULL,
574 "fsl,mpc5121-psc-fifo");
576 pr_err("%s: Can't find FIFOC node\n", __func__);
580 clk = of_clk_get(np, 0);
582 /* backwards compat with device trees that lack clock specs */
583 clk = clk_get_sys(np->name, "ipg");
586 pr_err("%s: Can't lookup FIFO clock\n", __func__);
590 if (clk_prepare_enable(clk)) {
591 pr_err("%s: Can't enable FIFO clock\n", __func__);
597 psc_fifoc = of_iomap(np, 0);
599 pr_err("%s: Can't map FIFOC\n", __func__);
600 goto out_clk_disable;
603 psc_fifoc_irq = irq_of_parse_and_map(np, 0);
604 if (psc_fifoc_irq == 0) {
605 pr_err("%s: Can't get FIFOC irq\n", __func__);
615 clk_disable_unprepare(psc_fifoc_clk);
616 clk_put(psc_fifoc_clk);
623 static void __exit mpc512x_psc_fifoc_uninit(void)
627 /* disable the clock, errors are not fatal */
629 clk_disable_unprepare(psc_fifoc_clk);
630 clk_put(psc_fifoc_clk);
631 psc_fifoc_clk = NULL;
635 /* 512x specific interrupt handler. The caller holds the port lock */
636 static irqreturn_t mpc512x_psc_handle_irq(struct uart_port *port)
638 unsigned long fifoc_int;
641 /* Read pending PSC FIFOC interrupts */
642 fifoc_int = in_be32(&psc_fifoc->fifoc_int);
644 /* Check if it is an interrupt for this port */
645 psc_num = (port->mapbase & 0xf00) >> 8;
646 if (test_bit(psc_num, &fifoc_int) ||
647 test_bit(psc_num + 16, &fifoc_int))
648 return mpc5xxx_uart_process_int(port);
653 static struct clk *psc_mclk_clk[MPC52xx_PSC_MAXNUM];
654 static struct clk *psc_ipg_clk[MPC52xx_PSC_MAXNUM];
656 /* called from within the .request_port() callback (allocation) */
657 static int mpc512x_psc_alloc_clock(struct uart_port *port)
663 psc_num = (port->mapbase & 0xf00) >> 8;
665 clk = devm_clk_get(port->dev, "mclk");
667 dev_err(port->dev, "Failed to get MCLK!\n");
671 err = clk_prepare_enable(clk);
673 dev_err(port->dev, "Failed to enable MCLK!\n");
676 psc_mclk_clk[psc_num] = clk;
678 clk = devm_clk_get(port->dev, "ipg");
680 dev_err(port->dev, "Failed to get IPG clock!\n");
684 err = clk_prepare_enable(clk);
686 dev_err(port->dev, "Failed to enable IPG clock!\n");
689 psc_ipg_clk[psc_num] = clk;
694 if (psc_mclk_clk[psc_num]) {
695 clk_disable_unprepare(psc_mclk_clk[psc_num]);
696 psc_mclk_clk[psc_num] = NULL;
698 if (psc_ipg_clk[psc_num]) {
699 clk_disable_unprepare(psc_ipg_clk[psc_num]);
700 psc_ipg_clk[psc_num] = NULL;
705 /* called from within the .release_port() callback (release) */
706 static void mpc512x_psc_relse_clock(struct uart_port *port)
711 psc_num = (port->mapbase & 0xf00) >> 8;
712 clk = psc_mclk_clk[psc_num];
714 clk_disable_unprepare(clk);
715 psc_mclk_clk[psc_num] = NULL;
717 if (psc_ipg_clk[psc_num]) {
718 clk_disable_unprepare(psc_ipg_clk[psc_num]);
719 psc_ipg_clk[psc_num] = NULL;
723 /* implementation of the .clock() callback (enable/disable) */
724 static int mpc512x_psc_endis_clock(struct uart_port *port, int enable)
730 if (uart_console(port))
733 psc_num = (port->mapbase & 0xf00) >> 8;
734 psc_clk = psc_mclk_clk[psc_num];
736 dev_err(port->dev, "Failed to get PSC clock entry!\n");
740 dev_dbg(port->dev, "mclk %sable\n", enable ? "en" : "dis");
742 ret = clk_enable(psc_clk);
744 dev_err(port->dev, "Failed to enable MCLK!\n");
747 clk_disable(psc_clk);
752 static void mpc512x_psc_get_irq(struct uart_port *port, struct device_node *np)
754 port->irqflags = IRQF_SHARED;
755 port->irq = psc_fifoc_irq;
759 #ifdef CONFIG_PPC_MPC512x
761 #define PSC_5125(port) ((struct mpc5125_psc __iomem *)((port)->membase))
762 #define FIFO_5125(port) ((struct mpc512x_psc_fifo __iomem *)(PSC_5125(port)+1))
764 static void mpc5125_psc_fifo_init(struct uart_port *port)
767 out_8(&PSC_5125(port)->mpc52xx_psc_clock_select, 0xdd);
769 out_be32(&FIFO_5125(port)->txcmd, MPC512x_PSC_FIFO_RESET_SLICE);
770 out_be32(&FIFO_5125(port)->txcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
771 out_be32(&FIFO_5125(port)->txalarm, 1);
772 out_be32(&FIFO_5125(port)->tximr, 0);
774 out_be32(&FIFO_5125(port)->rxcmd, MPC512x_PSC_FIFO_RESET_SLICE);
775 out_be32(&FIFO_5125(port)->rxcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
776 out_be32(&FIFO_5125(port)->rxalarm, 1);
777 out_be32(&FIFO_5125(port)->rximr, 0);
779 out_be32(&FIFO_5125(port)->tximr, MPC512x_PSC_FIFO_ALARM);
780 out_be32(&FIFO_5125(port)->rximr, MPC512x_PSC_FIFO_ALARM);
783 static int mpc5125_psc_raw_rx_rdy(struct uart_port *port)
785 return !(in_be32(&FIFO_5125(port)->rxsr) & MPC512x_PSC_FIFO_EMPTY);
788 static int mpc5125_psc_raw_tx_rdy(struct uart_port *port)
790 return !(in_be32(&FIFO_5125(port)->txsr) & MPC512x_PSC_FIFO_FULL);
793 static int mpc5125_psc_rx_rdy(struct uart_port *port)
795 return in_be32(&FIFO_5125(port)->rxsr) &
796 in_be32(&FIFO_5125(port)->rximr) & MPC512x_PSC_FIFO_ALARM;
799 static int mpc5125_psc_tx_rdy(struct uart_port *port)
801 return in_be32(&FIFO_5125(port)->txsr) &
802 in_be32(&FIFO_5125(port)->tximr) & MPC512x_PSC_FIFO_ALARM;
805 static int mpc5125_psc_tx_empty(struct uart_port *port)
807 return in_be32(&FIFO_5125(port)->txsr) & MPC512x_PSC_FIFO_EMPTY;
810 static void mpc5125_psc_stop_rx(struct uart_port *port)
812 unsigned long rx_fifo_imr;
814 rx_fifo_imr = in_be32(&FIFO_5125(port)->rximr);
815 rx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
816 out_be32(&FIFO_5125(port)->rximr, rx_fifo_imr);
819 static void mpc5125_psc_start_tx(struct uart_port *port)
821 unsigned long tx_fifo_imr;
823 tx_fifo_imr = in_be32(&FIFO_5125(port)->tximr);
824 tx_fifo_imr |= MPC512x_PSC_FIFO_ALARM;
825 out_be32(&FIFO_5125(port)->tximr, tx_fifo_imr);
828 static void mpc5125_psc_stop_tx(struct uart_port *port)
830 unsigned long tx_fifo_imr;
832 tx_fifo_imr = in_be32(&FIFO_5125(port)->tximr);
833 tx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
834 out_be32(&FIFO_5125(port)->tximr, tx_fifo_imr);
837 static void mpc5125_psc_rx_clr_irq(struct uart_port *port)
839 out_be32(&FIFO_5125(port)->rxisr, in_be32(&FIFO_5125(port)->rxisr));
842 static void mpc5125_psc_tx_clr_irq(struct uart_port *port)
844 out_be32(&FIFO_5125(port)->txisr, in_be32(&FIFO_5125(port)->txisr));
847 static void mpc5125_psc_write_char(struct uart_port *port, unsigned char c)
849 out_8(&FIFO_5125(port)->txdata_8, c);
852 static unsigned char mpc5125_psc_read_char(struct uart_port *port)
854 return in_8(&FIFO_5125(port)->rxdata_8);
857 static void mpc5125_psc_cw_disable_ints(struct uart_port *port)
859 port->read_status_mask =
860 in_be32(&FIFO_5125(port)->tximr) << 16 |
861 in_be32(&FIFO_5125(port)->rximr);
862 out_be32(&FIFO_5125(port)->tximr, 0);
863 out_be32(&FIFO_5125(port)->rximr, 0);
866 static void mpc5125_psc_cw_restore_ints(struct uart_port *port)
868 out_be32(&FIFO_5125(port)->tximr,
869 (port->read_status_mask >> 16) & 0x7f);
870 out_be32(&FIFO_5125(port)->rximr, port->read_status_mask & 0x7f);
873 static inline void mpc5125_set_divisor(struct mpc5125_psc __iomem *psc,
874 u8 prescaler, unsigned int divisor)
876 /* select prescaler */
877 out_8(&psc->mpc52xx_psc_clock_select, prescaler);
878 out_8(&psc->ctur, divisor >> 8);
879 out_8(&psc->ctlr, divisor & 0xff);
882 static unsigned int mpc5125_psc_set_baudrate(struct uart_port *port,
883 struct ktermios *new,
884 struct ktermios *old)
887 unsigned int divisor;
890 * Calculate with a /16 prescaler here.
893 /* uartclk contains the ips freq */
894 baud = uart_get_baud_rate(port, new, old,
895 port->uartclk / (16 * 0xffff) + 1,
897 divisor = (port->uartclk + 8 * baud) / (16 * baud);
899 /* enable the /16 prescaler and set the divisor */
900 mpc5125_set_divisor(PSC_5125(port), 0xdd, divisor);
905 * MPC5125 have compatible PSC FIFO Controller.
906 * Special init not needed.
908 static u16 mpc5125_psc_get_status(struct uart_port *port)
910 return in_be16(&PSC_5125(port)->mpc52xx_psc_status);
913 static u8 mpc5125_psc_get_ipcr(struct uart_port *port)
915 return in_8(&PSC_5125(port)->mpc52xx_psc_ipcr);
918 static void mpc5125_psc_command(struct uart_port *port, u8 cmd)
920 out_8(&PSC_5125(port)->command, cmd);
923 static void mpc5125_psc_set_mode(struct uart_port *port, u8 mr1, u8 mr2)
925 out_8(&PSC_5125(port)->mr1, mr1);
926 out_8(&PSC_5125(port)->mr2, mr2);
929 static void mpc5125_psc_set_rts(struct uart_port *port, int state)
931 if (state & TIOCM_RTS)
932 out_8(&PSC_5125(port)->op1, MPC52xx_PSC_OP_RTS);
934 out_8(&PSC_5125(port)->op0, MPC52xx_PSC_OP_RTS);
937 static void mpc5125_psc_enable_ms(struct uart_port *port)
939 struct mpc5125_psc __iomem *psc = PSC_5125(port);
941 /* clear D_*-bits by reading them */
942 in_8(&psc->mpc52xx_psc_ipcr);
943 /* enable CTS and DCD as IPC interrupts */
944 out_8(&psc->mpc52xx_psc_acr, MPC52xx_PSC_IEC_CTS | MPC52xx_PSC_IEC_DCD);
946 port->read_status_mask |= MPC52xx_PSC_IMR_IPC;
947 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
950 static void mpc5125_psc_set_sicr(struct uart_port *port, u32 val)
952 out_be32(&PSC_5125(port)->sicr, val);
955 static void mpc5125_psc_set_imr(struct uart_port *port, u16 val)
957 out_be16(&PSC_5125(port)->mpc52xx_psc_imr, val);
960 static u8 mpc5125_psc_get_mr1(struct uart_port *port)
962 return in_8(&PSC_5125(port)->mr1);
965 static const struct psc_ops mpc5125_psc_ops = {
966 .fifo_init = mpc5125_psc_fifo_init,
967 .raw_rx_rdy = mpc5125_psc_raw_rx_rdy,
968 .raw_tx_rdy = mpc5125_psc_raw_tx_rdy,
969 .rx_rdy = mpc5125_psc_rx_rdy,
970 .tx_rdy = mpc5125_psc_tx_rdy,
971 .tx_empty = mpc5125_psc_tx_empty,
972 .stop_rx = mpc5125_psc_stop_rx,
973 .start_tx = mpc5125_psc_start_tx,
974 .stop_tx = mpc5125_psc_stop_tx,
975 .rx_clr_irq = mpc5125_psc_rx_clr_irq,
976 .tx_clr_irq = mpc5125_psc_tx_clr_irq,
977 .write_char = mpc5125_psc_write_char,
978 .read_char = mpc5125_psc_read_char,
979 .cw_disable_ints = mpc5125_psc_cw_disable_ints,
980 .cw_restore_ints = mpc5125_psc_cw_restore_ints,
981 .set_baudrate = mpc5125_psc_set_baudrate,
982 .clock_alloc = mpc512x_psc_alloc_clock,
983 .clock_relse = mpc512x_psc_relse_clock,
984 .clock = mpc512x_psc_endis_clock,
985 .fifoc_init = mpc512x_psc_fifoc_init,
986 .fifoc_uninit = mpc512x_psc_fifoc_uninit,
987 .get_irq = mpc512x_psc_get_irq,
988 .handle_irq = mpc512x_psc_handle_irq,
989 .get_status = mpc5125_psc_get_status,
990 .get_ipcr = mpc5125_psc_get_ipcr,
991 .command = mpc5125_psc_command,
992 .set_mode = mpc5125_psc_set_mode,
993 .set_rts = mpc5125_psc_set_rts,
994 .enable_ms = mpc5125_psc_enable_ms,
995 .set_sicr = mpc5125_psc_set_sicr,
996 .set_imr = mpc5125_psc_set_imr,
997 .get_mr1 = mpc5125_psc_get_mr1,
1000 static const struct psc_ops mpc512x_psc_ops = {
1001 .fifo_init = mpc512x_psc_fifo_init,
1002 .raw_rx_rdy = mpc512x_psc_raw_rx_rdy,
1003 .raw_tx_rdy = mpc512x_psc_raw_tx_rdy,
1004 .rx_rdy = mpc512x_psc_rx_rdy,
1005 .tx_rdy = mpc512x_psc_tx_rdy,
1006 .tx_empty = mpc512x_psc_tx_empty,
1007 .stop_rx = mpc512x_psc_stop_rx,
1008 .start_tx = mpc512x_psc_start_tx,
1009 .stop_tx = mpc512x_psc_stop_tx,
1010 .rx_clr_irq = mpc512x_psc_rx_clr_irq,
1011 .tx_clr_irq = mpc512x_psc_tx_clr_irq,
1012 .write_char = mpc512x_psc_write_char,
1013 .read_char = mpc512x_psc_read_char,
1014 .cw_disable_ints = mpc512x_psc_cw_disable_ints,
1015 .cw_restore_ints = mpc512x_psc_cw_restore_ints,
1016 .set_baudrate = mpc512x_psc_set_baudrate,
1017 .clock_alloc = mpc512x_psc_alloc_clock,
1018 .clock_relse = mpc512x_psc_relse_clock,
1019 .clock = mpc512x_psc_endis_clock,
1020 .fifoc_init = mpc512x_psc_fifoc_init,
1021 .fifoc_uninit = mpc512x_psc_fifoc_uninit,
1022 .get_irq = mpc512x_psc_get_irq,
1023 .handle_irq = mpc512x_psc_handle_irq,
1024 .get_status = mpc52xx_psc_get_status,
1025 .get_ipcr = mpc52xx_psc_get_ipcr,
1026 .command = mpc52xx_psc_command,
1027 .set_mode = mpc52xx_psc_set_mode,
1028 .set_rts = mpc52xx_psc_set_rts,
1029 .enable_ms = mpc52xx_psc_enable_ms,
1030 .set_sicr = mpc52xx_psc_set_sicr,
1031 .set_imr = mpc52xx_psc_set_imr,
1032 .get_mr1 = mpc52xx_psc_get_mr1,
1034 #endif /* CONFIG_PPC_MPC512x */
1037 static const struct psc_ops *psc_ops;
1039 /* ======================================================================== */
1040 /* UART operations */
1041 /* ======================================================================== */
1044 mpc52xx_uart_tx_empty(struct uart_port *port)
1046 return psc_ops->tx_empty(port) ? TIOCSER_TEMT : 0;
1050 mpc52xx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
1052 psc_ops->set_rts(port, mctrl & TIOCM_RTS);
1056 mpc52xx_uart_get_mctrl(struct uart_port *port)
1058 unsigned int ret = TIOCM_DSR;
1059 u8 status = psc_ops->get_ipcr(port);
1061 if (!(status & MPC52xx_PSC_CTS))
1063 if (!(status & MPC52xx_PSC_DCD))
1070 mpc52xx_uart_stop_tx(struct uart_port *port)
1072 /* port->lock taken by caller */
1073 psc_ops->stop_tx(port);
1077 mpc52xx_uart_start_tx(struct uart_port *port)
1079 /* port->lock taken by caller */
1080 psc_ops->start_tx(port);
1084 mpc52xx_uart_stop_rx(struct uart_port *port)
1086 /* port->lock taken by caller */
1087 psc_ops->stop_rx(port);
1091 mpc52xx_uart_enable_ms(struct uart_port *port)
1093 psc_ops->enable_ms(port);
1097 mpc52xx_uart_break_ctl(struct uart_port *port, int ctl)
1099 unsigned long flags;
1100 spin_lock_irqsave(&port->lock, flags);
1103 psc_ops->command(port, MPC52xx_PSC_START_BRK);
1105 psc_ops->command(port, MPC52xx_PSC_STOP_BRK);
1107 spin_unlock_irqrestore(&port->lock, flags);
1111 mpc52xx_uart_startup(struct uart_port *port)
1115 if (psc_ops->clock) {
1116 ret = psc_ops->clock(port, 1);
1122 ret = request_irq(port->irq, mpc52xx_uart_int,
1123 port->irqflags, "mpc52xx_psc_uart", port);
1127 /* Reset/activate the port, clear and enable interrupts */
1128 psc_ops->command(port, MPC52xx_PSC_RST_RX);
1129 psc_ops->command(port, MPC52xx_PSC_RST_TX);
1132 * According to Freescale's support the RST_TX command can produce a
1133 * spike on the TX pin. So they recommend to delay "for one character".
1134 * One millisecond should be enough for everyone.
1138 psc_ops->set_sicr(port, 0); /* UART mode DCD ignored */
1140 psc_ops->fifo_init(port);
1142 psc_ops->command(port, MPC52xx_PSC_TX_ENABLE);
1143 psc_ops->command(port, MPC52xx_PSC_RX_ENABLE);
1149 mpc52xx_uart_shutdown(struct uart_port *port)
1151 /* Shut down the port. Leave TX active if on a console port */
1152 psc_ops->command(port, MPC52xx_PSC_RST_RX);
1153 if (!uart_console(port))
1154 psc_ops->command(port, MPC52xx_PSC_RST_TX);
1156 port->read_status_mask = 0;
1157 psc_ops->set_imr(port, port->read_status_mask);
1160 psc_ops->clock(port, 0);
1162 /* Disable interrupt */
1163 psc_ops->cw_disable_ints(port);
1165 /* Release interrupt */
1166 free_irq(port->irq, port);
1170 mpc52xx_uart_set_termios(struct uart_port *port, struct ktermios *new,
1171 struct ktermios *old)
1173 unsigned long flags;
1174 unsigned char mr1, mr2;
1178 /* Prepare what we're gonna write */
1181 switch (new->c_cflag & CSIZE) {
1182 case CS5: mr1 |= MPC52xx_PSC_MODE_5_BITS;
1184 case CS6: mr1 |= MPC52xx_PSC_MODE_6_BITS;
1186 case CS7: mr1 |= MPC52xx_PSC_MODE_7_BITS;
1189 default: mr1 |= MPC52xx_PSC_MODE_8_BITS;
1192 if (new->c_cflag & PARENB) {
1193 if (new->c_cflag & CMSPAR)
1194 mr1 |= MPC52xx_PSC_MODE_PARFORCE;
1196 /* With CMSPAR, PARODD also means high parity (same as termios) */
1197 mr1 |= (new->c_cflag & PARODD) ?
1198 MPC52xx_PSC_MODE_PARODD : MPC52xx_PSC_MODE_PAREVEN;
1200 mr1 |= MPC52xx_PSC_MODE_PARNONE;
1205 if (new->c_cflag & CSTOPB)
1206 mr2 |= MPC52xx_PSC_MODE_TWO_STOP;
1208 mr2 |= ((new->c_cflag & CSIZE) == CS5) ?
1209 MPC52xx_PSC_MODE_ONE_STOP_5_BITS :
1210 MPC52xx_PSC_MODE_ONE_STOP;
1212 if (new->c_cflag & CRTSCTS) {
1213 mr1 |= MPC52xx_PSC_MODE_RXRTS;
1214 mr2 |= MPC52xx_PSC_MODE_TXCTS;
1218 spin_lock_irqsave(&port->lock, flags);
1220 /* Do our best to flush TX & RX, so we don't lose anything */
1221 /* But we don't wait indefinitely ! */
1222 j = 5000000; /* Maximum wait */
1223 /* FIXME Can't receive chars since set_termios might be called at early
1224 * boot for the console, all stuff is not yet ready to receive at that
1225 * time and that just makes the kernel oops */
1226 /* while (j-- && mpc52xx_uart_int_rx_chars(port)); */
1227 while (!mpc52xx_uart_tx_empty(port) && --j)
1231 printk(KERN_ERR "mpc52xx_uart.c: "
1232 "Unable to flush RX & TX fifos in-time in set_termios."
1233 "Some chars may have been lost.\n");
1235 /* Reset the TX & RX */
1236 psc_ops->command(port, MPC52xx_PSC_RST_RX);
1237 psc_ops->command(port, MPC52xx_PSC_RST_TX);
1239 /* Send new mode settings */
1240 psc_ops->set_mode(port, mr1, mr2);
1241 baud = psc_ops->set_baudrate(port, new, old);
1243 /* Update the per-port timeout */
1244 uart_update_timeout(port, new->c_cflag, baud);
1246 if (UART_ENABLE_MS(port, new->c_cflag))
1247 mpc52xx_uart_enable_ms(port);
1249 /* Reenable TX & RX */
1250 psc_ops->command(port, MPC52xx_PSC_TX_ENABLE);
1251 psc_ops->command(port, MPC52xx_PSC_RX_ENABLE);
1253 /* We're all set, release the lock */
1254 spin_unlock_irqrestore(&port->lock, flags);
1258 mpc52xx_uart_type(struct uart_port *port)
1261 * We keep using PORT_MPC52xx for historic reasons although it applies
1262 * for MPC512x, too, but print "MPC5xxx" to not irritate users
1264 return port->type == PORT_MPC52xx ? "MPC5xxx PSC" : NULL;
1268 mpc52xx_uart_release_port(struct uart_port *port)
1270 if (psc_ops->clock_relse)
1271 psc_ops->clock_relse(port);
1273 /* remapped by us ? */
1274 if (port->flags & UPF_IOREMAP) {
1275 iounmap(port->membase);
1276 port->membase = NULL;
1279 release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc));
1283 mpc52xx_uart_request_port(struct uart_port *port)
1287 if (port->flags & UPF_IOREMAP) /* Need to remap ? */
1288 port->membase = ioremap(port->mapbase,
1289 sizeof(struct mpc52xx_psc));
1294 err = request_mem_region(port->mapbase, sizeof(struct mpc52xx_psc),
1295 "mpc52xx_psc_uart") != NULL ? 0 : -EBUSY;
1300 if (psc_ops->clock_alloc) {
1301 err = psc_ops->clock_alloc(port);
1309 release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc));
1311 if (port->flags & UPF_IOREMAP) {
1312 iounmap(port->membase);
1313 port->membase = NULL;
1319 mpc52xx_uart_config_port(struct uart_port *port, int flags)
1321 if ((flags & UART_CONFIG_TYPE)
1322 && (mpc52xx_uart_request_port(port) == 0))
1323 port->type = PORT_MPC52xx;
1327 mpc52xx_uart_verify_port(struct uart_port *port, struct serial_struct *ser)
1329 if (ser->type != PORT_UNKNOWN && ser->type != PORT_MPC52xx)
1332 if ((ser->irq != port->irq) ||
1333 (ser->io_type != UPIO_MEM) ||
1334 (ser->baud_base != port->uartclk) ||
1335 (ser->iomem_base != (void *)port->mapbase) ||
1343 static const struct uart_ops mpc52xx_uart_ops = {
1344 .tx_empty = mpc52xx_uart_tx_empty,
1345 .set_mctrl = mpc52xx_uart_set_mctrl,
1346 .get_mctrl = mpc52xx_uart_get_mctrl,
1347 .stop_tx = mpc52xx_uart_stop_tx,
1348 .start_tx = mpc52xx_uart_start_tx,
1349 .stop_rx = mpc52xx_uart_stop_rx,
1350 .enable_ms = mpc52xx_uart_enable_ms,
1351 .break_ctl = mpc52xx_uart_break_ctl,
1352 .startup = mpc52xx_uart_startup,
1353 .shutdown = mpc52xx_uart_shutdown,
1354 .set_termios = mpc52xx_uart_set_termios,
1355 /* .pm = mpc52xx_uart_pm, Not supported yet */
1356 .type = mpc52xx_uart_type,
1357 .release_port = mpc52xx_uart_release_port,
1358 .request_port = mpc52xx_uart_request_port,
1359 .config_port = mpc52xx_uart_config_port,
1360 .verify_port = mpc52xx_uart_verify_port
1364 /* ======================================================================== */
1365 /* Interrupt handling */
1366 /* ======================================================================== */
1369 mpc52xx_uart_int_rx_chars(struct uart_port *port)
1371 struct tty_port *tport = &port->state->port;
1372 unsigned char ch, flag;
1373 unsigned short status;
1375 /* While we can read, do so ! */
1376 while (psc_ops->raw_rx_rdy(port)) {
1378 ch = psc_ops->read_char(port);
1380 /* Handle sysreq char */
1381 if (uart_handle_sysrq_char(port, ch))
1389 status = psc_ops->get_status(port);
1391 if (status & (MPC52xx_PSC_SR_PE |
1393 MPC52xx_PSC_SR_RB)) {
1395 if (status & MPC52xx_PSC_SR_RB) {
1397 uart_handle_break(port);
1399 } else if (status & MPC52xx_PSC_SR_PE) {
1401 port->icount.parity++;
1403 else if (status & MPC52xx_PSC_SR_FE) {
1405 port->icount.frame++;
1408 /* Clear error condition */
1409 psc_ops->command(port, MPC52xx_PSC_RST_ERR_STAT);
1412 tty_insert_flip_char(tport, ch, flag);
1413 if (status & MPC52xx_PSC_SR_OE) {
1415 * Overrun is special, since it's
1416 * reported immediately, and doesn't
1417 * affect the current character
1419 tty_insert_flip_char(tport, 0, TTY_OVERRUN);
1420 port->icount.overrun++;
1424 tty_flip_buffer_push(tport);
1426 return psc_ops->raw_rx_rdy(port);
1430 mpc52xx_uart_int_tx_chars(struct uart_port *port)
1432 struct circ_buf *xmit = &port->state->xmit;
1434 /* Process out of band chars */
1436 psc_ops->write_char(port, port->x_char);
1442 /* Nothing to do ? */
1443 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
1444 mpc52xx_uart_stop_tx(port);
1449 while (psc_ops->raw_tx_rdy(port)) {
1450 psc_ops->write_char(port, xmit->buf[xmit->tail]);
1451 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
1453 if (uart_circ_empty(xmit))
1458 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
1459 uart_write_wakeup(port);
1461 /* Maybe we're done after all */
1462 if (uart_circ_empty(xmit)) {
1463 mpc52xx_uart_stop_tx(port);
1471 mpc5xxx_uart_process_int(struct uart_port *port)
1473 unsigned long pass = ISR_PASS_LIMIT;
1474 unsigned int keepgoing;
1477 /* While we have stuff to do, we continue */
1479 /* If we don't find anything to do, we stop */
1482 psc_ops->rx_clr_irq(port);
1483 if (psc_ops->rx_rdy(port))
1484 keepgoing |= mpc52xx_uart_int_rx_chars(port);
1486 psc_ops->tx_clr_irq(port);
1487 if (psc_ops->tx_rdy(port))
1488 keepgoing |= mpc52xx_uart_int_tx_chars(port);
1490 status = psc_ops->get_ipcr(port);
1491 if (status & MPC52xx_PSC_D_DCD)
1492 uart_handle_dcd_change(port, !(status & MPC52xx_PSC_DCD));
1494 if (status & MPC52xx_PSC_D_CTS)
1495 uart_handle_cts_change(port, !(status & MPC52xx_PSC_CTS));
1497 /* Limit number of iteration */
1501 } while (keepgoing);
1507 mpc52xx_uart_int(int irq, void *dev_id)
1509 struct uart_port *port = dev_id;
1512 spin_lock(&port->lock);
1514 ret = psc_ops->handle_irq(port);
1516 spin_unlock(&port->lock);
1521 /* ======================================================================== */
1522 /* Console ( if applicable ) */
1523 /* ======================================================================== */
1525 #ifdef CONFIG_SERIAL_MPC52xx_CONSOLE
1528 mpc52xx_console_get_options(struct uart_port *port,
1529 int *baud, int *parity, int *bits, int *flow)
1533 pr_debug("mpc52xx_console_get_options(port=%p)\n", port);
1535 /* Read the mode registers */
1536 mr1 = psc_ops->get_mr1(port);
1538 /* CT{U,L}R are write-only ! */
1539 *baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
1542 switch (mr1 & MPC52xx_PSC_MODE_BITS_MASK) {
1543 case MPC52xx_PSC_MODE_5_BITS:
1546 case MPC52xx_PSC_MODE_6_BITS:
1549 case MPC52xx_PSC_MODE_7_BITS:
1552 case MPC52xx_PSC_MODE_8_BITS:
1557 if (mr1 & MPC52xx_PSC_MODE_PARNONE)
1560 *parity = mr1 & MPC52xx_PSC_MODE_PARODD ? 'o' : 'e';
1564 mpc52xx_console_write(struct console *co, const char *s, unsigned int count)
1566 struct uart_port *port = &mpc52xx_uart_ports[co->index];
1569 /* Disable interrupts */
1570 psc_ops->cw_disable_ints(port);
1572 /* Wait the TX buffer to be empty */
1573 j = 5000000; /* Maximum wait */
1574 while (!mpc52xx_uart_tx_empty(port) && --j)
1577 /* Write all the chars */
1578 for (i = 0; i < count; i++, s++) {
1579 /* Line return handling */
1581 psc_ops->write_char(port, '\r');
1584 psc_ops->write_char(port, *s);
1586 /* Wait the TX buffer to be empty */
1587 j = 20000; /* Maximum wait */
1588 while (!mpc52xx_uart_tx_empty(port) && --j)
1592 /* Restore interrupt state */
1593 psc_ops->cw_restore_ints(port);
1598 mpc52xx_console_setup(struct console *co, char *options)
1600 struct uart_port *port = &mpc52xx_uart_ports[co->index];
1601 struct device_node *np = mpc52xx_uart_nodes[co->index];
1602 unsigned int uartclk;
1603 struct resource res;
1606 int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
1611 pr_debug("mpc52xx_console_setup co=%p, co->index=%i, options=%s\n",
1612 co, co->index, options);
1614 if ((co->index < 0) || (co->index >= MPC52xx_PSC_MAXNUM)) {
1615 pr_debug("PSC%x out of range\n", co->index);
1620 pr_debug("PSC%x not found in device tree\n", co->index);
1624 pr_debug("Console on ttyPSC%x is %pOF\n",
1625 co->index, mpc52xx_uart_nodes[co->index]);
1627 /* Fetch register locations */
1628 ret = of_address_to_resource(np, 0, &res);
1630 pr_debug("Could not get resources for PSC%x\n", co->index);
1634 uartclk = mpc5xxx_get_bus_frequency(np);
1636 pr_debug("Could not find uart clock frequency!\n");
1640 /* Basic port init. Needed since we use some uart_??? func before
1641 * real init for early access */
1642 spin_lock_init(&port->lock);
1643 port->uartclk = uartclk;
1644 port->ops = &mpc52xx_uart_ops;
1645 port->mapbase = res.start;
1646 port->membase = ioremap(res.start, sizeof(struct mpc52xx_psc));
1647 port->irq = irq_of_parse_and_map(np, 0);
1649 if (port->membase == NULL)
1652 pr_debug("mpc52xx-psc uart at %p, mapped to %p, irq=%x, freq=%i\n",
1653 (void *)port->mapbase, port->membase,
1654 port->irq, port->uartclk);
1656 /* Setup the port parameters accoding to options */
1658 uart_parse_options(options, &baud, &parity, &bits, &flow);
1660 mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow);
1662 pr_debug("Setting console parameters: %i %i%c1 flow=%c\n",
1663 baud, bits, parity, flow);
1665 return uart_set_options(port, co, baud, parity, bits, flow);
1669 static struct uart_driver mpc52xx_uart_driver;
1671 static struct console mpc52xx_console = {
1673 .write = mpc52xx_console_write,
1674 .device = uart_console_device,
1675 .setup = mpc52xx_console_setup,
1676 .flags = CON_PRINTBUFFER,
1677 .index = -1, /* Specified on the cmdline (e.g. console=ttyPSC0) */
1678 .data = &mpc52xx_uart_driver,
1683 mpc52xx_console_init(void)
1685 mpc52xx_uart_of_enumerate();
1686 register_console(&mpc52xx_console);
1690 console_initcall(mpc52xx_console_init);
1692 #define MPC52xx_PSC_CONSOLE &mpc52xx_console
1694 #define MPC52xx_PSC_CONSOLE NULL
1698 /* ======================================================================== */
1700 /* ======================================================================== */
1702 static struct uart_driver mpc52xx_uart_driver = {
1703 .driver_name = "mpc52xx_psc_uart",
1704 .dev_name = "ttyPSC",
1705 .major = SERIAL_PSC_MAJOR,
1706 .minor = SERIAL_PSC_MINOR,
1707 .nr = MPC52xx_PSC_MAXNUM,
1708 .cons = MPC52xx_PSC_CONSOLE,
1711 /* ======================================================================== */
1712 /* OF Platform Driver */
1713 /* ======================================================================== */
1715 static const struct of_device_id mpc52xx_uart_of_match[] = {
1716 #ifdef CONFIG_PPC_MPC52xx
1717 { .compatible = "fsl,mpc5200b-psc-uart", .data = &mpc5200b_psc_ops, },
1718 { .compatible = "fsl,mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
1719 /* binding used by old lite5200 device trees: */
1720 { .compatible = "mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
1721 /* binding used by efika: */
1722 { .compatible = "mpc5200-serial", .data = &mpc52xx_psc_ops, },
1724 #ifdef CONFIG_PPC_MPC512x
1725 { .compatible = "fsl,mpc5121-psc-uart", .data = &mpc512x_psc_ops, },
1726 { .compatible = "fsl,mpc5125-psc-uart", .data = &mpc5125_psc_ops, },
1731 static int mpc52xx_uart_of_probe(struct platform_device *op)
1734 unsigned int uartclk;
1735 struct uart_port *port = NULL;
1736 struct resource res;
1739 /* Check validity & presence */
1740 for (idx = 0; idx < MPC52xx_PSC_MAXNUM; idx++)
1741 if (mpc52xx_uart_nodes[idx] == op->dev.of_node)
1743 if (idx >= MPC52xx_PSC_MAXNUM)
1745 pr_debug("Found %pOF assigned to ttyPSC%x\n",
1746 mpc52xx_uart_nodes[idx], idx);
1748 /* set the uart clock to the input clock of the psc, the different
1749 * prescalers are taken into account in the set_baudrate() methods
1750 * of the respective chip */
1751 uartclk = mpc5xxx_get_bus_frequency(op->dev.of_node);
1753 dev_dbg(&op->dev, "Could not find uart clock frequency!\n");
1757 /* Init the port structure */
1758 port = &mpc52xx_uart_ports[idx];
1760 spin_lock_init(&port->lock);
1761 port->uartclk = uartclk;
1762 port->fifosize = 512;
1763 port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_MPC52xx_CONSOLE);
1764 port->iotype = UPIO_MEM;
1765 port->flags = UPF_BOOT_AUTOCONF |
1766 (uart_console(port) ? 0 : UPF_IOREMAP);
1768 port->ops = &mpc52xx_uart_ops;
1769 port->dev = &op->dev;
1771 /* Search for IRQ and mapbase */
1772 ret = of_address_to_resource(op->dev.of_node, 0, &res);
1776 port->mapbase = res.start;
1777 if (!port->mapbase) {
1778 dev_dbg(&op->dev, "Could not allocate resources for PSC\n");
1782 psc_ops->get_irq(port, op->dev.of_node);
1783 if (port->irq == 0) {
1784 dev_dbg(&op->dev, "Could not get irq\n");
1788 dev_dbg(&op->dev, "mpc52xx-psc uart at %p, irq=%x, freq=%i\n",
1789 (void *)port->mapbase, port->irq, port->uartclk);
1791 /* Add the port to the uart sub-system */
1792 ret = uart_add_one_port(&mpc52xx_uart_driver, port);
1796 platform_set_drvdata(op, (void *)port);
1801 mpc52xx_uart_of_remove(struct platform_device *op)
1803 struct uart_port *port = platform_get_drvdata(op);
1806 uart_remove_one_port(&mpc52xx_uart_driver, port);
1813 mpc52xx_uart_of_suspend(struct platform_device *op, pm_message_t state)
1815 struct uart_port *port = platform_get_drvdata(op);
1818 uart_suspend_port(&mpc52xx_uart_driver, port);
1824 mpc52xx_uart_of_resume(struct platform_device *op)
1826 struct uart_port *port = platform_get_drvdata(op);
1829 uart_resume_port(&mpc52xx_uart_driver, port);
1836 mpc52xx_uart_of_assign(struct device_node *np)
1840 /* Find the first free PSC number */
1841 for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
1842 if (mpc52xx_uart_nodes[i] == NULL) {
1844 mpc52xx_uart_nodes[i] = np;
1851 mpc52xx_uart_of_enumerate(void)
1853 static int enum_done;
1854 struct device_node *np;
1855 const struct of_device_id *match;
1861 /* Assign index to each PSC in device tree */
1862 for_each_matching_node(np, mpc52xx_uart_of_match) {
1863 match = of_match_node(mpc52xx_uart_of_match, np);
1864 psc_ops = match->data;
1865 mpc52xx_uart_of_assign(np);
1870 for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
1871 if (mpc52xx_uart_nodes[i])
1872 pr_debug("%pOF assigned to ttyPSC%x\n",
1873 mpc52xx_uart_nodes[i], i);
1877 MODULE_DEVICE_TABLE(of, mpc52xx_uart_of_match);
1879 static struct platform_driver mpc52xx_uart_of_driver = {
1880 .probe = mpc52xx_uart_of_probe,
1881 .remove = mpc52xx_uart_of_remove,
1883 .suspend = mpc52xx_uart_of_suspend,
1884 .resume = mpc52xx_uart_of_resume,
1887 .name = "mpc52xx-psc-uart",
1888 .of_match_table = mpc52xx_uart_of_match,
1893 /* ======================================================================== */
1895 /* ======================================================================== */
1898 mpc52xx_uart_init(void)
1902 printk(KERN_INFO "Serial: MPC52xx PSC UART driver\n");
1904 ret = uart_register_driver(&mpc52xx_uart_driver);
1906 printk(KERN_ERR "%s: uart_register_driver failed (%i)\n",
1911 mpc52xx_uart_of_enumerate();
1914 * Map the PSC FIFO Controller and init if on MPC512x.
1916 if (psc_ops && psc_ops->fifoc_init) {
1917 ret = psc_ops->fifoc_init();
1922 ret = platform_driver_register(&mpc52xx_uart_of_driver);
1924 printk(KERN_ERR "%s: platform_driver_register failed (%i)\n",
1931 if (psc_ops && psc_ops->fifoc_uninit)
1932 psc_ops->fifoc_uninit();
1934 uart_unregister_driver(&mpc52xx_uart_driver);
1939 mpc52xx_uart_exit(void)
1941 if (psc_ops->fifoc_uninit)
1942 psc_ops->fifoc_uninit();
1944 platform_driver_unregister(&mpc52xx_uart_of_driver);
1945 uart_unregister_driver(&mpc52xx_uart_driver);
1949 module_init(mpc52xx_uart_init);
1950 module_exit(mpc52xx_uart_exit);
1953 MODULE_DESCRIPTION("Freescale MPC52xx PSC UART");
1954 MODULE_LICENSE("GPL");