2 * Driver for the PSC of the Freescale MPC52xx PSCs configured as UARTs.
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.
14 * Maintainer : Sylvain Munaut <tnt@246tNt.com>
16 * Some of the code has been inspired/copied from the 2.4 code written
17 * by Dale Farnsworth <dfarnsworth@mvista.com>.
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.
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.
32 /* Platform device Usage :
34 * Since PSCs can have multiple function, the correct driver for each one
35 * is selected by calling mpc52xx_match_psc_function(...). The function
36 * handled by this driver is "uart".
38 * The driver init all necessary registers to place the PSC in uart mode without
39 * DCD. However, the pin multiplexing aren't changed and should be set either
40 * by the bootloader or in the platform init code.
42 * The idx field must be equal to the PSC index (e.g. 0 for PSC1, 1 for PSC2,
43 * and so on). So the PSC1 is mapped to /dev/ttyPSC0, PSC2 to /dev/ttyPSC1 and
44 * so on. But be warned, it's an ABSOLUTE REQUIREMENT ! This is needed mainly
45 * fpr the console code : without this 1:1 mapping, at early boot time, when we
46 * are parsing the kernel args console=ttyPSC?, we wouldn't know which PSC it
50 /* OF Platform device Usage :
52 * This driver is only used for PSCs configured in uart mode. The device
53 * tree will have a node for each PSC in uart mode w/ device_type = "serial"
54 * and "mpc52xx-psc-uart" in the compatible string
56 * By default, PSC devices are enumerated in the order they are found. However
57 * a particular PSC number can be forces by adding 'device_no = <port#>'
60 * The driver init all necessary registers to place the PSC in uart mode without
61 * DCD. However, the pin multiplexing aren't changed and should be set either
62 * by the bootloader or in the platform init code.
67 #include <linux/device.h>
68 #include <linux/module.h>
69 #include <linux/tty.h>
70 #include <linux/serial.h>
71 #include <linux/sysrq.h>
72 #include <linux/console.h>
73 #include <linux/delay.h>
76 #if defined(CONFIG_PPC_MERGE)
78 #include <linux/of_platform.h>
80 #include <linux/platform_device.h>
83 #include <asm/mpc52xx.h>
84 #include <asm/mpc512x.h>
85 #include <asm/mpc52xx_psc.h>
87 #if defined(CONFIG_SERIAL_MPC52xx_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
91 #include <linux/serial_core.h>
94 /* We've been assigned a range on the "Low-density serial ports" major */
95 #define SERIAL_PSC_MAJOR 204
96 #define SERIAL_PSC_MINOR 148
99 #define ISR_PASS_LIMIT 256 /* Max number of iteration in the interrupt */
102 static struct uart_port mpc52xx_uart_ports[MPC52xx_PSC_MAXNUM];
103 /* Rem: - We use the read_status_mask as a shadow of
104 * psc->mpc52xx_psc_imr
105 * - It's important that is array is all zero on start as we
106 * use it to know if it's initialized or not ! If it's not sure
107 * it's cleared, then a memset(...,0,...) should be added to
110 #if defined(CONFIG_PPC_MERGE)
111 /* lookup table for matching device nodes to index numbers */
112 static struct device_node *mpc52xx_uart_nodes[MPC52xx_PSC_MAXNUM];
114 static void mpc52xx_uart_of_enumerate(void);
118 #define PSC(port) ((struct mpc52xx_psc __iomem *)((port)->membase))
121 /* Forward declaration of the interruption handling routine */
122 static irqreturn_t mpc52xx_uart_int(int irq, void *dev_id);
125 /* Simple macro to test if a port is console or not. This one is taken
126 * for serial_core.c and maybe should be moved to serial_core.h ? */
127 #ifdef CONFIG_SERIAL_CORE_CONSOLE
128 #define uart_console(port) \
129 ((port)->cons && (port)->cons->index == (port)->line)
131 #define uart_console(port) (0)
134 /* ======================================================================== */
135 /* PSC fifo operations for isolating differences between 52xx and 512x */
136 /* ======================================================================== */
139 void (*fifo_init)(struct uart_port *port);
140 int (*raw_rx_rdy)(struct uart_port *port);
141 int (*raw_tx_rdy)(struct uart_port *port);
142 int (*rx_rdy)(struct uart_port *port);
143 int (*tx_rdy)(struct uart_port *port);
144 int (*tx_empty)(struct uart_port *port);
145 void (*stop_rx)(struct uart_port *port);
146 void (*start_tx)(struct uart_port *port);
147 void (*stop_tx)(struct uart_port *port);
148 void (*rx_clr_irq)(struct uart_port *port);
149 void (*tx_clr_irq)(struct uart_port *port);
150 void (*write_char)(struct uart_port *port, unsigned char c);
151 unsigned char (*read_char)(struct uart_port *port);
152 void (*cw_disable_ints)(struct uart_port *port);
153 void (*cw_restore_ints)(struct uart_port *port);
154 unsigned long (*getuartclk)(void *p);
157 #ifdef CONFIG_PPC_MPC52xx
158 #define FIFO_52xx(port) ((struct mpc52xx_psc_fifo __iomem *)(PSC(port)+1))
159 static void mpc52xx_psc_fifo_init(struct uart_port *port)
161 struct mpc52xx_psc __iomem *psc = PSC(port);
162 struct mpc52xx_psc_fifo __iomem *fifo = FIFO_52xx(port);
165 out_be16(&psc->mpc52xx_psc_clock_select, 0xdd00);
167 out_8(&fifo->rfcntl, 0x00);
168 out_be16(&fifo->rfalarm, 0x1ff);
169 out_8(&fifo->tfcntl, 0x07);
170 out_be16(&fifo->tfalarm, 0x80);
172 port->read_status_mask |= MPC52xx_PSC_IMR_RXRDY | MPC52xx_PSC_IMR_TXRDY;
173 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
176 static int mpc52xx_psc_raw_rx_rdy(struct uart_port *port)
178 return in_be16(&PSC(port)->mpc52xx_psc_status)
179 & MPC52xx_PSC_SR_RXRDY;
182 static int mpc52xx_psc_raw_tx_rdy(struct uart_port *port)
184 return in_be16(&PSC(port)->mpc52xx_psc_status)
185 & MPC52xx_PSC_SR_TXRDY;
189 static int mpc52xx_psc_rx_rdy(struct uart_port *port)
191 return in_be16(&PSC(port)->mpc52xx_psc_isr)
192 & port->read_status_mask
193 & MPC52xx_PSC_IMR_RXRDY;
196 static int mpc52xx_psc_tx_rdy(struct uart_port *port)
198 return in_be16(&PSC(port)->mpc52xx_psc_isr)
199 & port->read_status_mask
200 & MPC52xx_PSC_IMR_TXRDY;
203 static int mpc52xx_psc_tx_empty(struct uart_port *port)
205 return in_be16(&PSC(port)->mpc52xx_psc_status)
206 & MPC52xx_PSC_SR_TXEMP;
209 static void mpc52xx_psc_start_tx(struct uart_port *port)
211 port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY;
212 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
215 static void mpc52xx_psc_stop_tx(struct uart_port *port)
217 port->read_status_mask &= ~MPC52xx_PSC_IMR_TXRDY;
218 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
221 static void mpc52xx_psc_stop_rx(struct uart_port *port)
223 port->read_status_mask &= ~MPC52xx_PSC_IMR_RXRDY;
224 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
227 static void mpc52xx_psc_rx_clr_irq(struct uart_port *port)
231 static void mpc52xx_psc_tx_clr_irq(struct uart_port *port)
235 static void mpc52xx_psc_write_char(struct uart_port *port, unsigned char c)
237 out_8(&PSC(port)->mpc52xx_psc_buffer_8, c);
240 static unsigned char mpc52xx_psc_read_char(struct uart_port *port)
242 return in_8(&PSC(port)->mpc52xx_psc_buffer_8);
245 static void mpc52xx_psc_cw_disable_ints(struct uart_port *port)
247 out_be16(&PSC(port)->mpc52xx_psc_imr, 0);
250 static void mpc52xx_psc_cw_restore_ints(struct uart_port *port)
252 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
255 /* Search for bus-frequency property in this node or a parent */
256 static unsigned long mpc52xx_getuartclk(void *p)
258 #if defined(CONFIG_PPC_MERGE)
260 * 5200 UARTs have a / 32 prescaler
261 * but the generic serial code assumes 16
262 * so return ipb freq / 2
264 return mpc52xx_find_ipb_freq(p) / 2;
266 pr_debug("unexpected call to mpc52xx_getuartclk with arch/ppc\n");
271 static struct psc_ops mpc52xx_psc_ops = {
272 .fifo_init = mpc52xx_psc_fifo_init,
273 .raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
274 .raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
275 .rx_rdy = mpc52xx_psc_rx_rdy,
276 .tx_rdy = mpc52xx_psc_tx_rdy,
277 .tx_empty = mpc52xx_psc_tx_empty,
278 .stop_rx = mpc52xx_psc_stop_rx,
279 .start_tx = mpc52xx_psc_start_tx,
280 .stop_tx = mpc52xx_psc_stop_tx,
281 .rx_clr_irq = mpc52xx_psc_rx_clr_irq,
282 .tx_clr_irq = mpc52xx_psc_tx_clr_irq,
283 .write_char = mpc52xx_psc_write_char,
284 .read_char = mpc52xx_psc_read_char,
285 .cw_disable_ints = mpc52xx_psc_cw_disable_ints,
286 .cw_restore_ints = mpc52xx_psc_cw_restore_ints,
287 .getuartclk = mpc52xx_getuartclk,
290 #endif /* CONFIG_MPC52xx */
292 #ifdef CONFIG_PPC_MPC512x
293 #define FIFO_512x(port) ((struct mpc512x_psc_fifo __iomem *)(PSC(port)+1))
294 static void mpc512x_psc_fifo_init(struct uart_port *port)
296 out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_RESET_SLICE);
297 out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
298 out_be32(&FIFO_512x(port)->txalarm, 1);
299 out_be32(&FIFO_512x(port)->tximr, 0);
301 out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_RESET_SLICE);
302 out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
303 out_be32(&FIFO_512x(port)->rxalarm, 1);
304 out_be32(&FIFO_512x(port)->rximr, 0);
306 out_be32(&FIFO_512x(port)->tximr, MPC512x_PSC_FIFO_ALARM);
307 out_be32(&FIFO_512x(port)->rximr, MPC512x_PSC_FIFO_ALARM);
310 static int mpc512x_psc_raw_rx_rdy(struct uart_port *port)
312 return !(in_be32(&FIFO_512x(port)->rxsr) & MPC512x_PSC_FIFO_EMPTY);
315 static int mpc512x_psc_raw_tx_rdy(struct uart_port *port)
317 return !(in_be32(&FIFO_512x(port)->txsr) & MPC512x_PSC_FIFO_FULL);
320 static int mpc512x_psc_rx_rdy(struct uart_port *port)
322 return in_be32(&FIFO_512x(port)->rxsr)
323 & in_be32(&FIFO_512x(port)->rximr)
324 & MPC512x_PSC_FIFO_ALARM;
327 static int mpc512x_psc_tx_rdy(struct uart_port *port)
329 return in_be32(&FIFO_512x(port)->txsr)
330 & in_be32(&FIFO_512x(port)->tximr)
331 & MPC512x_PSC_FIFO_ALARM;
334 static int mpc512x_psc_tx_empty(struct uart_port *port)
336 return in_be32(&FIFO_512x(port)->txsr)
337 & MPC512x_PSC_FIFO_EMPTY;
340 static void mpc512x_psc_stop_rx(struct uart_port *port)
342 unsigned long rx_fifo_imr;
344 rx_fifo_imr = in_be32(&FIFO_512x(port)->rximr);
345 rx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
346 out_be32(&FIFO_512x(port)->rximr, rx_fifo_imr);
349 static void mpc512x_psc_start_tx(struct uart_port *port)
351 unsigned long tx_fifo_imr;
353 tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
354 tx_fifo_imr |= MPC512x_PSC_FIFO_ALARM;
355 out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
358 static void mpc512x_psc_stop_tx(struct uart_port *port)
360 unsigned long tx_fifo_imr;
362 tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
363 tx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
364 out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
367 static void mpc512x_psc_rx_clr_irq(struct uart_port *port)
369 out_be32(&FIFO_512x(port)->rxisr, in_be32(&FIFO_512x(port)->rxisr));
372 static void mpc512x_psc_tx_clr_irq(struct uart_port *port)
374 out_be32(&FIFO_512x(port)->txisr, in_be32(&FIFO_512x(port)->txisr));
377 static void mpc512x_psc_write_char(struct uart_port *port, unsigned char c)
379 out_8(&FIFO_512x(port)->txdata_8, c);
382 static unsigned char mpc512x_psc_read_char(struct uart_port *port)
384 return in_8(&FIFO_512x(port)->rxdata_8);
387 static void mpc512x_psc_cw_disable_ints(struct uart_port *port)
389 port->read_status_mask =
390 in_be32(&FIFO_512x(port)->tximr) << 16 |
391 in_be32(&FIFO_512x(port)->rximr);
392 out_be32(&FIFO_512x(port)->tximr, 0);
393 out_be32(&FIFO_512x(port)->rximr, 0);
396 static void mpc512x_psc_cw_restore_ints(struct uart_port *port)
398 out_be32(&FIFO_512x(port)->tximr,
399 (port->read_status_mask >> 16) & 0x7f);
400 out_be32(&FIFO_512x(port)->rximr, port->read_status_mask & 0x7f);
403 static unsigned long mpc512x_getuartclk(void *p)
405 return mpc512x_find_ips_freq(p);
408 static struct psc_ops mpc512x_psc_ops = {
409 .fifo_init = mpc512x_psc_fifo_init,
410 .raw_rx_rdy = mpc512x_psc_raw_rx_rdy,
411 .raw_tx_rdy = mpc512x_psc_raw_tx_rdy,
412 .rx_rdy = mpc512x_psc_rx_rdy,
413 .tx_rdy = mpc512x_psc_tx_rdy,
414 .tx_empty = mpc512x_psc_tx_empty,
415 .stop_rx = mpc512x_psc_stop_rx,
416 .start_tx = mpc512x_psc_start_tx,
417 .stop_tx = mpc512x_psc_stop_tx,
418 .rx_clr_irq = mpc512x_psc_rx_clr_irq,
419 .tx_clr_irq = mpc512x_psc_tx_clr_irq,
420 .write_char = mpc512x_psc_write_char,
421 .read_char = mpc512x_psc_read_char,
422 .cw_disable_ints = mpc512x_psc_cw_disable_ints,
423 .cw_restore_ints = mpc512x_psc_cw_restore_ints,
424 .getuartclk = mpc512x_getuartclk,
428 static struct psc_ops *psc_ops;
430 /* ======================================================================== */
431 /* UART operations */
432 /* ======================================================================== */
435 mpc52xx_uart_tx_empty(struct uart_port *port)
437 return psc_ops->tx_empty(port) ? TIOCSER_TEMT : 0;
441 mpc52xx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
443 /* Not implemented */
447 mpc52xx_uart_get_mctrl(struct uart_port *port)
449 /* Not implemented */
450 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
454 mpc52xx_uart_stop_tx(struct uart_port *port)
456 /* port->lock taken by caller */
457 psc_ops->stop_tx(port);
461 mpc52xx_uart_start_tx(struct uart_port *port)
463 /* port->lock taken by caller */
464 psc_ops->start_tx(port);
468 mpc52xx_uart_send_xchar(struct uart_port *port, char ch)
471 spin_lock_irqsave(&port->lock, flags);
475 /* Make sure tx interrupts are on */
476 /* Truly necessary ??? They should be anyway */
477 psc_ops->start_tx(port);
480 spin_unlock_irqrestore(&port->lock, flags);
484 mpc52xx_uart_stop_rx(struct uart_port *port)
486 /* port->lock taken by caller */
487 psc_ops->stop_rx(port);
491 mpc52xx_uart_enable_ms(struct uart_port *port)
493 /* Not implemented */
497 mpc52xx_uart_break_ctl(struct uart_port *port, int ctl)
500 spin_lock_irqsave(&port->lock, flags);
503 out_8(&PSC(port)->command, MPC52xx_PSC_START_BRK);
505 out_8(&PSC(port)->command, MPC52xx_PSC_STOP_BRK);
507 spin_unlock_irqrestore(&port->lock, flags);
511 mpc52xx_uart_startup(struct uart_port *port)
513 struct mpc52xx_psc __iomem *psc = PSC(port);
517 ret = request_irq(port->irq, mpc52xx_uart_int,
518 IRQF_DISABLED | IRQF_SAMPLE_RANDOM | IRQF_SHARED,
519 "mpc52xx_psc_uart", port);
523 /* Reset/activate the port, clear and enable interrupts */
524 out_8(&psc->command, MPC52xx_PSC_RST_RX);
525 out_8(&psc->command, MPC52xx_PSC_RST_TX);
527 out_be32(&psc->sicr, 0); /* UART mode DCD ignored */
529 psc_ops->fifo_init(port);
531 out_8(&psc->command, MPC52xx_PSC_TX_ENABLE);
532 out_8(&psc->command, MPC52xx_PSC_RX_ENABLE);
538 mpc52xx_uart_shutdown(struct uart_port *port)
540 struct mpc52xx_psc __iomem *psc = PSC(port);
542 /* Shut down the port. Leave TX active if on a console port */
543 out_8(&psc->command, MPC52xx_PSC_RST_RX);
544 if (!uart_console(port))
545 out_8(&psc->command, MPC52xx_PSC_RST_TX);
547 port->read_status_mask = 0;
548 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
550 /* Release interrupt */
551 free_irq(port->irq, port);
555 mpc52xx_uart_set_termios(struct uart_port *port, struct ktermios *new,
556 struct ktermios *old)
558 struct mpc52xx_psc __iomem *psc = PSC(port);
560 unsigned char mr1, mr2;
562 unsigned int j, baud, quot;
564 /* Prepare what we're gonna write */
567 switch (new->c_cflag & CSIZE) {
568 case CS5: mr1 |= MPC52xx_PSC_MODE_5_BITS;
570 case CS6: mr1 |= MPC52xx_PSC_MODE_6_BITS;
572 case CS7: mr1 |= MPC52xx_PSC_MODE_7_BITS;
575 default: mr1 |= MPC52xx_PSC_MODE_8_BITS;
578 if (new->c_cflag & PARENB) {
579 mr1 |= (new->c_cflag & PARODD) ?
580 MPC52xx_PSC_MODE_PARODD : MPC52xx_PSC_MODE_PAREVEN;
582 mr1 |= MPC52xx_PSC_MODE_PARNONE;
587 if (new->c_cflag & CSTOPB)
588 mr2 |= MPC52xx_PSC_MODE_TWO_STOP;
590 mr2 |= ((new->c_cflag & CSIZE) == CS5) ?
591 MPC52xx_PSC_MODE_ONE_STOP_5_BITS :
592 MPC52xx_PSC_MODE_ONE_STOP;
595 baud = uart_get_baud_rate(port, new, old, 0, port->uartclk/16);
596 quot = uart_get_divisor(port, baud);
600 spin_lock_irqsave(&port->lock, flags);
602 /* Update the per-port timeout */
603 uart_update_timeout(port, new->c_cflag, baud);
605 /* Do our best to flush TX & RX, so we don't loose anything */
606 /* But we don't wait indefinitly ! */
607 j = 5000000; /* Maximum wait */
608 /* FIXME Can't receive chars since set_termios might be called at early
609 * boot for the console, all stuff is not yet ready to receive at that
610 * time and that just makes the kernel oops */
611 /* while (j-- && mpc52xx_uart_int_rx_chars(port)); */
612 while (!mpc52xx_uart_tx_empty(port) && --j)
616 printk(KERN_ERR "mpc52xx_uart.c: "
617 "Unable to flush RX & TX fifos in-time in set_termios."
618 "Some chars may have been lost.\n");
620 /* Reset the TX & RX */
621 out_8(&psc->command, MPC52xx_PSC_RST_RX);
622 out_8(&psc->command, MPC52xx_PSC_RST_TX);
624 /* Send new mode settings */
625 out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
626 out_8(&psc->mode, mr1);
627 out_8(&psc->mode, mr2);
628 out_8(&psc->ctur, ctr >> 8);
629 out_8(&psc->ctlr, ctr & 0xff);
631 /* Reenable TX & RX */
632 out_8(&psc->command, MPC52xx_PSC_TX_ENABLE);
633 out_8(&psc->command, MPC52xx_PSC_RX_ENABLE);
635 /* We're all set, release the lock */
636 spin_unlock_irqrestore(&port->lock, flags);
640 mpc52xx_uart_type(struct uart_port *port)
642 return port->type == PORT_MPC52xx ? "MPC52xx PSC" : NULL;
646 mpc52xx_uart_release_port(struct uart_port *port)
648 /* remapped by us ? */
649 if (port->flags & UPF_IOREMAP) {
650 iounmap(port->membase);
651 port->membase = NULL;
654 release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc));
658 mpc52xx_uart_request_port(struct uart_port *port)
662 if (port->flags & UPF_IOREMAP) /* Need to remap ? */
663 port->membase = ioremap(port->mapbase,
664 sizeof(struct mpc52xx_psc));
669 err = request_mem_region(port->mapbase, sizeof(struct mpc52xx_psc),
670 "mpc52xx_psc_uart") != NULL ? 0 : -EBUSY;
672 if (err && (port->flags & UPF_IOREMAP)) {
673 iounmap(port->membase);
674 port->membase = NULL;
681 mpc52xx_uart_config_port(struct uart_port *port, int flags)
683 if ((flags & UART_CONFIG_TYPE)
684 && (mpc52xx_uart_request_port(port) == 0))
685 port->type = PORT_MPC52xx;
689 mpc52xx_uart_verify_port(struct uart_port *port, struct serial_struct *ser)
691 if (ser->type != PORT_UNKNOWN && ser->type != PORT_MPC52xx)
694 if ((ser->irq != port->irq) ||
695 (ser->io_type != SERIAL_IO_MEM) ||
696 (ser->baud_base != port->uartclk) ||
697 (ser->iomem_base != (void *)port->mapbase) ||
705 static struct uart_ops mpc52xx_uart_ops = {
706 .tx_empty = mpc52xx_uart_tx_empty,
707 .set_mctrl = mpc52xx_uart_set_mctrl,
708 .get_mctrl = mpc52xx_uart_get_mctrl,
709 .stop_tx = mpc52xx_uart_stop_tx,
710 .start_tx = mpc52xx_uart_start_tx,
711 .send_xchar = mpc52xx_uart_send_xchar,
712 .stop_rx = mpc52xx_uart_stop_rx,
713 .enable_ms = mpc52xx_uart_enable_ms,
714 .break_ctl = mpc52xx_uart_break_ctl,
715 .startup = mpc52xx_uart_startup,
716 .shutdown = mpc52xx_uart_shutdown,
717 .set_termios = mpc52xx_uart_set_termios,
718 /* .pm = mpc52xx_uart_pm, Not supported yet */
719 /* .set_wake = mpc52xx_uart_set_wake, Not supported yet */
720 .type = mpc52xx_uart_type,
721 .release_port = mpc52xx_uart_release_port,
722 .request_port = mpc52xx_uart_request_port,
723 .config_port = mpc52xx_uart_config_port,
724 .verify_port = mpc52xx_uart_verify_port
728 /* ======================================================================== */
729 /* Interrupt handling */
730 /* ======================================================================== */
733 mpc52xx_uart_int_rx_chars(struct uart_port *port)
735 struct tty_struct *tty = port->info->tty;
736 unsigned char ch, flag;
737 unsigned short status;
739 /* While we can read, do so ! */
740 while (psc_ops->raw_rx_rdy(port)) {
742 ch = psc_ops->read_char(port);
744 /* Handle sysreq char */
746 if (uart_handle_sysrq_char(port, ch)) {
757 status = in_be16(&PSC(port)->mpc52xx_psc_status);
759 if (status & (MPC52xx_PSC_SR_PE |
761 MPC52xx_PSC_SR_RB)) {
763 if (status & MPC52xx_PSC_SR_RB) {
765 uart_handle_break(port);
766 } else if (status & MPC52xx_PSC_SR_PE)
768 else if (status & MPC52xx_PSC_SR_FE)
771 /* Clear error condition */
772 out_8(&PSC(port)->command, MPC52xx_PSC_RST_ERR_STAT);
775 tty_insert_flip_char(tty, ch, flag);
776 if (status & MPC52xx_PSC_SR_OE) {
778 * Overrun is special, since it's
779 * reported immediately, and doesn't
780 * affect the current character
782 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
786 tty_flip_buffer_push(tty);
788 return psc_ops->raw_rx_rdy(port);
792 mpc52xx_uart_int_tx_chars(struct uart_port *port)
794 struct circ_buf *xmit = &port->info->xmit;
796 /* Process out of band chars */
798 psc_ops->write_char(port, port->x_char);
804 /* Nothing to do ? */
805 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
806 mpc52xx_uart_stop_tx(port);
811 while (psc_ops->raw_tx_rdy(port)) {
812 psc_ops->write_char(port, xmit->buf[xmit->tail]);
813 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
815 if (uart_circ_empty(xmit))
820 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
821 uart_write_wakeup(port);
823 /* Maybe we're done after all */
824 if (uart_circ_empty(xmit)) {
825 mpc52xx_uart_stop_tx(port);
833 mpc52xx_uart_int(int irq, void *dev_id)
835 struct uart_port *port = dev_id;
836 unsigned long pass = ISR_PASS_LIMIT;
837 unsigned int keepgoing;
839 spin_lock(&port->lock);
841 /* While we have stuff to do, we continue */
843 /* If we don't find anything to do, we stop */
846 psc_ops->rx_clr_irq(port);
847 if (psc_ops->rx_rdy(port))
848 keepgoing |= mpc52xx_uart_int_rx_chars(port);
850 psc_ops->tx_clr_irq(port);
851 if (psc_ops->tx_rdy(port))
852 keepgoing |= mpc52xx_uart_int_tx_chars(port);
854 /* Limit number of iteration */
860 spin_unlock(&port->lock);
866 /* ======================================================================== */
867 /* Console ( if applicable ) */
868 /* ======================================================================== */
870 #ifdef CONFIG_SERIAL_MPC52xx_CONSOLE
873 mpc52xx_console_get_options(struct uart_port *port,
874 int *baud, int *parity, int *bits, int *flow)
876 struct mpc52xx_psc __iomem *psc = PSC(port);
879 pr_debug("mpc52xx_console_get_options(port=%p)\n", port);
881 /* Read the mode registers */
882 out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
883 mr1 = in_8(&psc->mode);
885 /* CT{U,L}R are write-only ! */
886 *baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
887 #if !defined(CONFIG_PPC_MERGE)
888 if (__res.bi_baudrate)
889 *baud = __res.bi_baudrate;
893 switch (mr1 & MPC52xx_PSC_MODE_BITS_MASK) {
894 case MPC52xx_PSC_MODE_5_BITS:
897 case MPC52xx_PSC_MODE_6_BITS:
900 case MPC52xx_PSC_MODE_7_BITS:
903 case MPC52xx_PSC_MODE_8_BITS:
908 if (mr1 & MPC52xx_PSC_MODE_PARNONE)
911 *parity = mr1 & MPC52xx_PSC_MODE_PARODD ? 'o' : 'e';
915 mpc52xx_console_write(struct console *co, const char *s, unsigned int count)
917 struct uart_port *port = &mpc52xx_uart_ports[co->index];
920 /* Disable interrupts */
921 psc_ops->cw_disable_ints(port);
923 /* Wait the TX buffer to be empty */
924 j = 5000000; /* Maximum wait */
925 while (!mpc52xx_uart_tx_empty(port) && --j)
928 /* Write all the chars */
929 for (i = 0; i < count; i++, s++) {
930 /* Line return handling */
932 psc_ops->write_char(port, '\r');
935 psc_ops->write_char(port, *s);
937 /* Wait the TX buffer to be empty */
938 j = 20000; /* Maximum wait */
939 while (!mpc52xx_uart_tx_empty(port) && --j)
943 /* Restore interrupt state */
944 psc_ops->cw_restore_ints(port);
947 #if !defined(CONFIG_PPC_MERGE)
949 mpc52xx_console_setup(struct console *co, char *options)
951 struct uart_port *port = &mpc52xx_uart_ports[co->index];
953 int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
958 if (co->index < 0 || co->index >= MPC52xx_PSC_MAXNUM)
961 /* Basic port init. Needed since we use some uart_??? func before
962 * real init for early access */
963 spin_lock_init(&port->lock);
964 port->uartclk = __res.bi_ipbfreq / 2; /* Look at CTLR doc */
965 port->ops = &mpc52xx_uart_ops;
966 port->mapbase = MPC52xx_PA(MPC52xx_PSCx_OFFSET(co->index+1));
968 /* We ioremap ourself */
969 port->membase = ioremap(port->mapbase, MPC52xx_PSC_SIZE);
970 if (port->membase == NULL)
973 /* Setup the port parameters accoding to options */
975 uart_parse_options(options, &baud, &parity, &bits, &flow);
977 mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow);
979 return uart_set_options(port, co, baud, parity, bits, flow);
985 mpc52xx_console_setup(struct console *co, char *options)
987 struct uart_port *port = &mpc52xx_uart_ports[co->index];
988 struct device_node *np = mpc52xx_uart_nodes[co->index];
989 unsigned int uartclk;
993 int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
998 pr_debug("mpc52xx_console_setup co=%p, co->index=%i, options=%s\n",
999 co, co->index, options);
1001 if ((co->index < 0) || (co->index > MPC52xx_PSC_MAXNUM)) {
1002 pr_debug("PSC%x out of range\n", co->index);
1007 pr_debug("PSC%x not found in device tree\n", co->index);
1011 pr_debug("Console on ttyPSC%x is %s\n",
1012 co->index, mpc52xx_uart_nodes[co->index]->full_name);
1014 /* Fetch register locations */
1015 ret = of_address_to_resource(np, 0, &res);
1017 pr_debug("Could not get resources for PSC%x\n", co->index);
1021 uartclk = psc_ops->getuartclk(np);
1023 pr_debug("Could not find uart clock frequency!\n");
1027 /* Basic port init. Needed since we use some uart_??? func before
1028 * real init for early access */
1029 spin_lock_init(&port->lock);
1030 port->uartclk = uartclk;
1031 port->ops = &mpc52xx_uart_ops;
1032 port->mapbase = res.start;
1033 port->membase = ioremap(res.start, sizeof(struct mpc52xx_psc));
1034 port->irq = irq_of_parse_and_map(np, 0);
1036 if (port->membase == NULL)
1039 pr_debug("mpc52xx-psc uart at %p, mapped to %p, irq=%x, freq=%i\n",
1040 (void *)port->mapbase, port->membase,
1041 port->irq, port->uartclk);
1043 /* Setup the port parameters accoding to options */
1045 uart_parse_options(options, &baud, &parity, &bits, &flow);
1047 mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow);
1049 pr_debug("Setting console parameters: %i %i%c1 flow=%c\n",
1050 baud, bits, parity, flow);
1052 return uart_set_options(port, co, baud, parity, bits, flow);
1054 #endif /* defined(CONFIG_PPC_MERGE) */
1057 static struct uart_driver mpc52xx_uart_driver;
1059 static struct console mpc52xx_console = {
1061 .write = mpc52xx_console_write,
1062 .device = uart_console_device,
1063 .setup = mpc52xx_console_setup,
1064 .flags = CON_PRINTBUFFER,
1065 .index = -1, /* Specified on the cmdline (e.g. console=ttyPSC0) */
1066 .data = &mpc52xx_uart_driver,
1071 mpc52xx_console_init(void)
1073 #if defined(CONFIG_PPC_MERGE)
1074 mpc52xx_uart_of_enumerate();
1076 register_console(&mpc52xx_console);
1080 console_initcall(mpc52xx_console_init);
1082 #define MPC52xx_PSC_CONSOLE &mpc52xx_console
1084 #define MPC52xx_PSC_CONSOLE NULL
1088 /* ======================================================================== */
1090 /* ======================================================================== */
1092 static struct uart_driver mpc52xx_uart_driver = {
1093 .driver_name = "mpc52xx_psc_uart",
1094 .dev_name = "ttyPSC",
1095 .major = SERIAL_PSC_MAJOR,
1096 .minor = SERIAL_PSC_MINOR,
1097 .nr = MPC52xx_PSC_MAXNUM,
1098 .cons = MPC52xx_PSC_CONSOLE,
1102 #if !defined(CONFIG_PPC_MERGE)
1103 /* ======================================================================== */
1104 /* Platform Driver */
1105 /* ======================================================================== */
1107 static int __devinit
1108 mpc52xx_uart_probe(struct platform_device *dev)
1110 struct resource *res = dev->resource;
1112 struct uart_port *port = NULL;
1115 /* Check validity & presence */
1117 if (idx < 0 || idx >= MPC52xx_PSC_MAXNUM)
1120 if (!mpc52xx_match_psc_function(idx, "uart"))
1123 /* Init the port structure */
1124 port = &mpc52xx_uart_ports[idx];
1126 spin_lock_init(&port->lock);
1127 port->uartclk = __res.bi_ipbfreq / 2; /* Look at CTLR doc */
1128 port->fifosize = 512;
1129 port->iotype = UPIO_MEM;
1130 port->flags = UPF_BOOT_AUTOCONF |
1131 (uart_console(port) ? 0 : UPF_IOREMAP);
1133 port->ops = &mpc52xx_uart_ops;
1134 port->dev = &dev->dev;
1136 /* Search for IRQ and mapbase */
1137 for (i = 0 ; i < dev->num_resources ; i++, res++) {
1138 if (res->flags & IORESOURCE_MEM)
1139 port->mapbase = res->start;
1140 else if (res->flags & IORESOURCE_IRQ)
1141 port->irq = res->start;
1143 if (!port->irq || !port->mapbase)
1146 /* Add the port to the uart sub-system */
1147 ret = uart_add_one_port(&mpc52xx_uart_driver, port);
1149 platform_set_drvdata(dev, (void *)port);
1155 mpc52xx_uart_remove(struct platform_device *dev)
1157 struct uart_port *port = (struct uart_port *) platform_get_drvdata(dev);
1159 platform_set_drvdata(dev, NULL);
1162 uart_remove_one_port(&mpc52xx_uart_driver, port);
1169 mpc52xx_uart_suspend(struct platform_device *dev, pm_message_t state)
1171 struct uart_port *port = (struct uart_port *) platform_get_drvdata(dev);
1174 uart_suspend_port(&mpc52xx_uart_driver, port);
1180 mpc52xx_uart_resume(struct platform_device *dev)
1182 struct uart_port *port = (struct uart_port *) platform_get_drvdata(dev);
1185 uart_resume_port(&mpc52xx_uart_driver, port);
1192 static struct platform_driver mpc52xx_uart_platform_driver = {
1193 .probe = mpc52xx_uart_probe,
1194 .remove = mpc52xx_uart_remove,
1196 .suspend = mpc52xx_uart_suspend,
1197 .resume = mpc52xx_uart_resume,
1200 .owner = THIS_MODULE,
1201 .name = "mpc52xx-psc",
1204 #endif /* !defined(CONFIG_PPC_MERGE) */
1207 #if defined(CONFIG_PPC_MERGE)
1208 /* ======================================================================== */
1209 /* OF Platform Driver */
1210 /* ======================================================================== */
1212 static struct of_device_id mpc52xx_uart_of_match[] = {
1213 #ifdef CONFIG_PPC_MPC52xx
1214 { .compatible = "fsl,mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
1215 /* binding used by old lite5200 device trees: */
1216 { .compatible = "mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
1217 /* binding used by efika: */
1218 { .compatible = "mpc5200-serial", .data = &mpc52xx_psc_ops, },
1220 #ifdef CONFIG_PPC_MPC512x
1221 { .compatible = "fsl,mpc5121-psc-uart", .data = &mpc512x_psc_ops, },
1226 static int __devinit
1227 mpc52xx_uart_of_probe(struct of_device *op, const struct of_device_id *match)
1230 unsigned int uartclk;
1231 struct uart_port *port = NULL;
1232 struct resource res;
1235 dev_dbg(&op->dev, "mpc52xx_uart_probe(op=%p, match=%p)\n", op, match);
1237 /* Check validity & presence */
1238 for (idx = 0; idx < MPC52xx_PSC_MAXNUM; idx++)
1239 if (mpc52xx_uart_nodes[idx] == op->node)
1241 if (idx >= MPC52xx_PSC_MAXNUM)
1243 pr_debug("Found %s assigned to ttyPSC%x\n",
1244 mpc52xx_uart_nodes[idx]->full_name, idx);
1246 uartclk = psc_ops->getuartclk(op->node);
1248 dev_dbg(&op->dev, "Could not find uart clock frequency!\n");
1252 /* Init the port structure */
1253 port = &mpc52xx_uart_ports[idx];
1255 spin_lock_init(&port->lock);
1256 port->uartclk = uartclk;
1257 port->fifosize = 512;
1258 port->iotype = UPIO_MEM;
1259 port->flags = UPF_BOOT_AUTOCONF |
1260 (uart_console(port) ? 0 : UPF_IOREMAP);
1262 port->ops = &mpc52xx_uart_ops;
1263 port->dev = &op->dev;
1265 /* Search for IRQ and mapbase */
1266 ret = of_address_to_resource(op->node, 0, &res);
1270 port->mapbase = res.start;
1271 port->irq = irq_of_parse_and_map(op->node, 0);
1273 dev_dbg(&op->dev, "mpc52xx-psc uart at %p, irq=%x, freq=%i\n",
1274 (void *)port->mapbase, port->irq, port->uartclk);
1276 if ((port->irq == NO_IRQ) || !port->mapbase) {
1277 printk(KERN_ERR "Could not allocate resources for PSC\n");
1281 /* Add the port to the uart sub-system */
1282 ret = uart_add_one_port(&mpc52xx_uart_driver, port);
1284 dev_set_drvdata(&op->dev, (void *)port);
1290 mpc52xx_uart_of_remove(struct of_device *op)
1292 struct uart_port *port = dev_get_drvdata(&op->dev);
1293 dev_set_drvdata(&op->dev, NULL);
1296 uart_remove_one_port(&mpc52xx_uart_driver, port);
1297 irq_dispose_mapping(port->irq);
1305 mpc52xx_uart_of_suspend(struct of_device *op, pm_message_t state)
1307 struct uart_port *port = (struct uart_port *) dev_get_drvdata(&op->dev);
1310 uart_suspend_port(&mpc52xx_uart_driver, port);
1316 mpc52xx_uart_of_resume(struct of_device *op)
1318 struct uart_port *port = (struct uart_port *) dev_get_drvdata(&op->dev);
1321 uart_resume_port(&mpc52xx_uart_driver, port);
1328 mpc52xx_uart_of_assign(struct device_node *np, int idx)
1333 /* Find the first free node */
1334 for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
1335 if (mpc52xx_uart_nodes[i] == NULL) {
1341 if ((idx < 0) || (idx >= MPC52xx_PSC_MAXNUM))
1345 return; /* No free slot; abort */
1348 /* If the slot is already occupied, then swap slots */
1349 if (mpc52xx_uart_nodes[idx] && (free_idx != -1))
1350 mpc52xx_uart_nodes[free_idx] = mpc52xx_uart_nodes[idx];
1351 mpc52xx_uart_nodes[idx] = np;
1355 mpc52xx_uart_of_enumerate(void)
1357 static int enum_done;
1358 struct device_node *np;
1359 const unsigned int *devno;
1360 const struct of_device_id *match;
1366 for_each_node_by_type(np, "serial") {
1367 match = of_match_node(mpc52xx_uart_of_match, np);
1371 psc_ops = match->data;
1373 /* Is a particular device number requested? */
1374 devno = of_get_property(np, "port-number", NULL);
1375 mpc52xx_uart_of_assign(np, devno ? *devno : -1);
1380 for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
1381 if (mpc52xx_uart_nodes[i])
1382 pr_debug("%s assigned to ttyPSC%x\n",
1383 mpc52xx_uart_nodes[i]->full_name, i);
1387 MODULE_DEVICE_TABLE(of, mpc52xx_uart_of_match);
1389 static struct of_platform_driver mpc52xx_uart_of_driver = {
1390 .match_table = mpc52xx_uart_of_match,
1391 .probe = mpc52xx_uart_of_probe,
1392 .remove = mpc52xx_uart_of_remove,
1394 .suspend = mpc52xx_uart_of_suspend,
1395 .resume = mpc52xx_uart_of_resume,
1398 .name = "mpc52xx-psc-uart",
1401 #endif /* defined(CONFIG_PPC_MERGE) */
1404 /* ======================================================================== */
1406 /* ======================================================================== */
1409 mpc52xx_uart_init(void)
1413 printk(KERN_INFO "Serial: MPC52xx PSC UART driver\n");
1415 ret = uart_register_driver(&mpc52xx_uart_driver);
1417 printk(KERN_ERR "%s: uart_register_driver failed (%i)\n",
1422 #if defined(CONFIG_PPC_MERGE)
1423 mpc52xx_uart_of_enumerate();
1425 ret = of_register_platform_driver(&mpc52xx_uart_of_driver);
1427 printk(KERN_ERR "%s: of_register_platform_driver failed (%i)\n",
1429 uart_unregister_driver(&mpc52xx_uart_driver);
1433 psc_ops = &mpc52xx_psc_ops;
1434 ret = platform_driver_register(&mpc52xx_uart_platform_driver);
1436 printk(KERN_ERR "%s: platform_driver_register failed (%i)\n",
1438 uart_unregister_driver(&mpc52xx_uart_driver);
1447 mpc52xx_uart_exit(void)
1449 #if defined(CONFIG_PPC_MERGE)
1450 of_unregister_platform_driver(&mpc52xx_uart_of_driver);
1452 platform_driver_unregister(&mpc52xx_uart_platform_driver);
1454 uart_unregister_driver(&mpc52xx_uart_driver);
1458 module_init(mpc52xx_uart_init);
1459 module_exit(mpc52xx_uart_exit);
1461 MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
1462 MODULE_DESCRIPTION("Freescale MPC52xx PSC UART");
1463 MODULE_LICENSE("GPL");