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) 2006 Secret Lab Technologies Ltd.
20 * Grant Likely <grant.likely@secretlab.ca>
21 * Copyright (C) 2004-2006 Sylvain Munaut <tnt@246tNt.com>
22 * Copyright (C) 2003 MontaVista, Software, Inc.
24 * This file is licensed under the terms of the GNU General Public License
25 * version 2. This program is licensed "as is" without any warranty of any
26 * kind, whether express or implied.
29 /* Platform device Usage :
31 * Since PSCs can have multiple function, the correct driver for each one
32 * is selected by calling mpc52xx_match_psc_function(...). The function
33 * handled by this driver is "uart".
35 * The driver init all necessary registers to place the PSC in uart mode without
36 * DCD. However, the pin multiplexing aren't changed and should be set either
37 * by the bootloader or in the platform init code.
39 * The idx field must be equal to the PSC index (e.g. 0 for PSC1, 1 for PSC2,
40 * and so on). So the PSC1 is mapped to /dev/ttyPSC0, PSC2 to /dev/ttyPSC1 and
41 * so on. But be warned, it's an ABSOLUTE REQUIREMENT ! This is needed mainly
42 * fpr the console code : without this 1:1 mapping, at early boot time, when we
43 * are parsing the kernel args console=ttyPSC?, we wouldn't know which PSC it
47 /* OF Platform device Usage :
49 * This driver is only used for PSCs configured in uart mode. The device
50 * tree will have a node for each PSC in uart mode w/ device_type = "serial"
51 * and "mpc52xx-psc-uart" in the compatible string
53 * By default, PSC devices are enumerated in the order they are found. However
54 * a particular PSC number can be forces by adding 'device_no = <port#>'
57 * The driver init all necessary registers to place the PSC in uart mode without
58 * DCD. However, the pin multiplexing aren't changed and should be set either
59 * by the bootloader or in the platform init code.
64 #include <linux/device.h>
65 #include <linux/module.h>
66 #include <linux/tty.h>
67 #include <linux/serial.h>
68 #include <linux/sysrq.h>
69 #include <linux/console.h>
71 #include <linux/delay.h>
74 #if defined(CONFIG_PPC_MERGE)
76 #include <linux/of_platform.h>
78 #include <linux/platform_device.h>
81 #include <asm/mpc52xx.h>
82 #include <asm/mpc52xx_psc.h>
84 #if defined(CONFIG_SERIAL_MPC52xx_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
88 #include <linux/serial_core.h>
91 /* We've been assigned a range on the "Low-density serial ports" major */
92 #define SERIAL_PSC_MAJOR 204
93 #define SERIAL_PSC_MINOR 148
96 #define ISR_PASS_LIMIT 256 /* Max number of iteration in the interrupt */
99 static struct uart_port mpc52xx_uart_ports[MPC52xx_PSC_MAXNUM];
100 /* Rem: - We use the read_status_mask as a shadow of
101 * psc->mpc52xx_psc_imr
102 * - It's important that is array is all zero on start as we
103 * use it to know if it's initialized or not ! If it's not sure
104 * it's cleared, then a memset(...,0,...) should be added to
107 #if defined(CONFIG_PPC_MERGE)
108 /* lookup table for matching device nodes to index numbers */
109 static struct device_node *mpc52xx_uart_nodes[MPC52xx_PSC_MAXNUM];
111 static void mpc52xx_uart_of_enumerate(void);
114 #define PSC(port) ((struct mpc52xx_psc __iomem *)((port)->membase))
115 #define FIFO(port) ((struct mpc52xx_psc_fifo __iomem *)(PSC(port)+1))
118 /* Forward declaration of the interruption handling routine */
119 static irqreturn_t mpc52xx_uart_int(int irq, void *dev_id);
122 /* Simple macro to test if a port is console or not. This one is taken
123 * for serial_core.c and maybe should be moved to serial_core.h ? */
124 #ifdef CONFIG_SERIAL_CORE_CONSOLE
125 #define uart_console(port) \
126 ((port)->cons && (port)->cons->index == (port)->line)
128 #define uart_console(port) (0)
131 #if defined(CONFIG_PPC_MERGE)
132 static struct of_device_id mpc52xx_uart_of_match[] = {
133 { .type = "serial", .compatible = "mpc5200-psc-uart", },
139 /* ======================================================================== */
140 /* UART operations */
141 /* ======================================================================== */
144 mpc52xx_uart_tx_empty(struct uart_port *port)
146 int status = in_be16(&PSC(port)->mpc52xx_psc_status);
147 return (status & MPC52xx_PSC_SR_TXEMP) ? TIOCSER_TEMT : 0;
151 mpc52xx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
153 /* Not implemented */
157 mpc52xx_uart_get_mctrl(struct uart_port *port)
159 /* Not implemented */
160 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
164 mpc52xx_uart_stop_tx(struct uart_port *port)
166 /* port->lock taken by caller */
167 port->read_status_mask &= ~MPC52xx_PSC_IMR_TXRDY;
168 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
172 mpc52xx_uart_start_tx(struct uart_port *port)
174 /* port->lock taken by caller */
175 port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY;
176 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
180 mpc52xx_uart_send_xchar(struct uart_port *port, char ch)
183 spin_lock_irqsave(&port->lock, flags);
187 /* Make sure tx interrupts are on */
188 /* Truly necessary ??? They should be anyway */
189 port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY;
190 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
193 spin_unlock_irqrestore(&port->lock, flags);
197 mpc52xx_uart_stop_rx(struct uart_port *port)
199 /* port->lock taken by caller */
200 port->read_status_mask &= ~MPC52xx_PSC_IMR_RXRDY;
201 out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
205 mpc52xx_uart_enable_ms(struct uart_port *port)
207 /* Not implemented */
211 mpc52xx_uart_break_ctl(struct uart_port *port, int ctl)
214 spin_lock_irqsave(&port->lock, flags);
217 out_8(&PSC(port)->command, MPC52xx_PSC_START_BRK);
219 out_8(&PSC(port)->command, MPC52xx_PSC_STOP_BRK);
221 spin_unlock_irqrestore(&port->lock, flags);
225 mpc52xx_uart_startup(struct uart_port *port)
227 struct mpc52xx_psc __iomem *psc = PSC(port);
228 struct mpc52xx_psc_fifo __iomem *fifo = FIFO(port);
232 ret = request_irq(port->irq, mpc52xx_uart_int,
233 IRQF_DISABLED | IRQF_SAMPLE_RANDOM, "mpc52xx_psc_uart", port);
237 /* Reset/activate the port, clear and enable interrupts */
238 out_8(&psc->command, MPC52xx_PSC_RST_RX);
239 out_8(&psc->command, MPC52xx_PSC_RST_TX);
241 out_be32(&psc->sicr, 0); /* UART mode DCD ignored */
243 out_be16(&psc->mpc52xx_psc_clock_select, 0xdd00); /* /16 prescaler on */
245 out_8(&fifo->rfcntl, 0x00);
246 out_be16(&fifo->rfalarm, 0x1ff);
247 out_8(&fifo->tfcntl, 0x07);
248 out_be16(&fifo->tfalarm, 0x80);
250 port->read_status_mask |= MPC52xx_PSC_IMR_RXRDY | MPC52xx_PSC_IMR_TXRDY;
251 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
253 out_8(&psc->command, MPC52xx_PSC_TX_ENABLE);
254 out_8(&psc->command, MPC52xx_PSC_RX_ENABLE);
260 mpc52xx_uart_shutdown(struct uart_port *port)
262 struct mpc52xx_psc __iomem *psc = PSC(port);
264 /* Shut down the port. Leave TX active if on a console port */
265 out_8(&psc->command, MPC52xx_PSC_RST_RX);
266 if (!uart_console(port))
267 out_8(&psc->command, MPC52xx_PSC_RST_TX);
269 port->read_status_mask = 0;
270 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
272 /* Release interrupt */
273 free_irq(port->irq, port);
277 mpc52xx_uart_set_termios(struct uart_port *port, struct ktermios *new,
278 struct ktermios *old)
280 struct mpc52xx_psc __iomem *psc = PSC(port);
282 unsigned char mr1, mr2;
284 unsigned int j, baud, quot;
286 /* Prepare what we're gonna write */
289 switch (new->c_cflag & CSIZE) {
290 case CS5: mr1 |= MPC52xx_PSC_MODE_5_BITS;
292 case CS6: mr1 |= MPC52xx_PSC_MODE_6_BITS;
294 case CS7: mr1 |= MPC52xx_PSC_MODE_7_BITS;
297 default: mr1 |= MPC52xx_PSC_MODE_8_BITS;
300 if (new->c_cflag & PARENB) {
301 mr1 |= (new->c_cflag & PARODD) ?
302 MPC52xx_PSC_MODE_PARODD : MPC52xx_PSC_MODE_PAREVEN;
304 mr1 |= MPC52xx_PSC_MODE_PARNONE;
309 if (new->c_cflag & CSTOPB)
310 mr2 |= MPC52xx_PSC_MODE_TWO_STOP;
312 mr2 |= ((new->c_cflag & CSIZE) == CS5) ?
313 MPC52xx_PSC_MODE_ONE_STOP_5_BITS :
314 MPC52xx_PSC_MODE_ONE_STOP;
317 baud = uart_get_baud_rate(port, new, old, 0, port->uartclk/16);
318 quot = uart_get_divisor(port, baud);
322 spin_lock_irqsave(&port->lock, flags);
324 /* Update the per-port timeout */
325 uart_update_timeout(port, new->c_cflag, baud);
327 /* Do our best to flush TX & RX, so we don't loose anything */
328 /* But we don't wait indefinitly ! */
329 j = 5000000; /* Maximum wait */
330 /* FIXME Can't receive chars since set_termios might be called at early
331 * boot for the console, all stuff is not yet ready to receive at that
332 * time and that just makes the kernel oops */
333 /* while (j-- && mpc52xx_uart_int_rx_chars(port)); */
334 while (!(in_be16(&psc->mpc52xx_psc_status) & MPC52xx_PSC_SR_TXEMP) &&
339 printk(KERN_ERR "mpc52xx_uart.c: "
340 "Unable to flush RX & TX fifos in-time in set_termios."
341 "Some chars may have been lost.\n");
343 /* Reset the TX & RX */
344 out_8(&psc->command, MPC52xx_PSC_RST_RX);
345 out_8(&psc->command, MPC52xx_PSC_RST_TX);
347 /* Send new mode settings */
348 out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
349 out_8(&psc->mode, mr1);
350 out_8(&psc->mode, mr2);
351 out_8(&psc->ctur, ctr >> 8);
352 out_8(&psc->ctlr, ctr & 0xff);
354 /* Reenable TX & RX */
355 out_8(&psc->command, MPC52xx_PSC_TX_ENABLE);
356 out_8(&psc->command, MPC52xx_PSC_RX_ENABLE);
358 /* We're all set, release the lock */
359 spin_unlock_irqrestore(&port->lock, flags);
363 mpc52xx_uart_type(struct uart_port *port)
365 return port->type == PORT_MPC52xx ? "MPC52xx PSC" : NULL;
369 mpc52xx_uart_release_port(struct uart_port *port)
371 /* remapped by us ? */
372 if (port->flags & UPF_IOREMAP) {
373 iounmap(port->membase);
374 port->membase = NULL;
377 release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc));
381 mpc52xx_uart_request_port(struct uart_port *port)
385 if (port->flags & UPF_IOREMAP) /* Need to remap ? */
386 port->membase = ioremap(port->mapbase,
387 sizeof(struct mpc52xx_psc));
392 err = request_mem_region(port->mapbase, sizeof(struct mpc52xx_psc),
393 "mpc52xx_psc_uart") != NULL ? 0 : -EBUSY;
395 if (err && (port->flags & UPF_IOREMAP)) {
396 iounmap(port->membase);
397 port->membase = NULL;
404 mpc52xx_uart_config_port(struct uart_port *port, int flags)
406 if ((flags & UART_CONFIG_TYPE)
407 && (mpc52xx_uart_request_port(port) == 0))
408 port->type = PORT_MPC52xx;
412 mpc52xx_uart_verify_port(struct uart_port *port, struct serial_struct *ser)
414 if (ser->type != PORT_UNKNOWN && ser->type != PORT_MPC52xx)
417 if ((ser->irq != port->irq) ||
418 (ser->io_type != SERIAL_IO_MEM) ||
419 (ser->baud_base != port->uartclk) ||
420 (ser->iomem_base != (void *)port->mapbase) ||
428 static struct uart_ops mpc52xx_uart_ops = {
429 .tx_empty = mpc52xx_uart_tx_empty,
430 .set_mctrl = mpc52xx_uart_set_mctrl,
431 .get_mctrl = mpc52xx_uart_get_mctrl,
432 .stop_tx = mpc52xx_uart_stop_tx,
433 .start_tx = mpc52xx_uart_start_tx,
434 .send_xchar = mpc52xx_uart_send_xchar,
435 .stop_rx = mpc52xx_uart_stop_rx,
436 .enable_ms = mpc52xx_uart_enable_ms,
437 .break_ctl = mpc52xx_uart_break_ctl,
438 .startup = mpc52xx_uart_startup,
439 .shutdown = mpc52xx_uart_shutdown,
440 .set_termios = mpc52xx_uart_set_termios,
441 /* .pm = mpc52xx_uart_pm, Not supported yet */
442 /* .set_wake = mpc52xx_uart_set_wake, Not supported yet */
443 .type = mpc52xx_uart_type,
444 .release_port = mpc52xx_uart_release_port,
445 .request_port = mpc52xx_uart_request_port,
446 .config_port = mpc52xx_uart_config_port,
447 .verify_port = mpc52xx_uart_verify_port
451 /* ======================================================================== */
452 /* Interrupt handling */
453 /* ======================================================================== */
456 mpc52xx_uart_int_rx_chars(struct uart_port *port)
458 struct tty_struct *tty = port->info->tty;
459 unsigned char ch, flag;
460 unsigned short status;
462 /* While we can read, do so ! */
463 while ((status = in_be16(&PSC(port)->mpc52xx_psc_status)) &
464 MPC52xx_PSC_SR_RXRDY) {
467 ch = in_8(&PSC(port)->mpc52xx_psc_buffer_8);
469 /* Handle sysreq char */
471 if (uart_handle_sysrq_char(port, ch)) {
482 if (status & (MPC52xx_PSC_SR_PE |
484 MPC52xx_PSC_SR_RB)) {
486 if (status & MPC52xx_PSC_SR_RB) {
488 uart_handle_break(port);
489 } else if (status & MPC52xx_PSC_SR_PE)
491 else if (status & MPC52xx_PSC_SR_FE)
494 /* Clear error condition */
495 out_8(&PSC(port)->command, MPC52xx_PSC_RST_ERR_STAT);
498 tty_insert_flip_char(tty, ch, flag);
499 if (status & MPC52xx_PSC_SR_OE) {
501 * Overrun is special, since it's
502 * reported immediately, and doesn't
503 * affect the current character
505 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
509 tty_flip_buffer_push(tty);
511 return in_be16(&PSC(port)->mpc52xx_psc_status) & MPC52xx_PSC_SR_RXRDY;
515 mpc52xx_uart_int_tx_chars(struct uart_port *port)
517 struct circ_buf *xmit = &port->info->xmit;
519 /* Process out of band chars */
521 out_8(&PSC(port)->mpc52xx_psc_buffer_8, port->x_char);
527 /* Nothing to do ? */
528 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
529 mpc52xx_uart_stop_tx(port);
534 while (in_be16(&PSC(port)->mpc52xx_psc_status) & MPC52xx_PSC_SR_TXRDY) {
535 out_8(&PSC(port)->mpc52xx_psc_buffer_8, xmit->buf[xmit->tail]);
536 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
538 if (uart_circ_empty(xmit))
543 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
544 uart_write_wakeup(port);
546 /* Maybe we're done after all */
547 if (uart_circ_empty(xmit)) {
548 mpc52xx_uart_stop_tx(port);
556 mpc52xx_uart_int(int irq, void *dev_id)
558 struct uart_port *port = dev_id;
559 unsigned long pass = ISR_PASS_LIMIT;
560 unsigned int keepgoing;
561 unsigned short status;
563 spin_lock(&port->lock);
565 /* While we have stuff to do, we continue */
567 /* If we don't find anything to do, we stop */
571 status = in_be16(&PSC(port)->mpc52xx_psc_isr);
572 status &= port->read_status_mask;
574 /* Do we need to receive chars ? */
575 /* For this RX interrupts must be on and some chars waiting */
576 if (status & MPC52xx_PSC_IMR_RXRDY)
577 keepgoing |= mpc52xx_uart_int_rx_chars(port);
579 /* Do we need to send chars ? */
580 /* For this, TX must be ready and TX interrupt enabled */
581 if (status & MPC52xx_PSC_IMR_TXRDY)
582 keepgoing |= mpc52xx_uart_int_tx_chars(port);
584 /* Limit number of iteration */
590 spin_unlock(&port->lock);
596 /* ======================================================================== */
597 /* Console ( if applicable ) */
598 /* ======================================================================== */
600 #ifdef CONFIG_SERIAL_MPC52xx_CONSOLE
603 mpc52xx_console_get_options(struct uart_port *port,
604 int *baud, int *parity, int *bits, int *flow)
606 struct mpc52xx_psc __iomem *psc = PSC(port);
609 pr_debug("mpc52xx_console_get_options(port=%p)\n", port);
611 /* Read the mode registers */
612 out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
613 mr1 = in_8(&psc->mode);
615 /* CT{U,L}R are write-only ! */
616 *baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
617 #if !defined(CONFIG_PPC_MERGE)
618 if (__res.bi_baudrate)
619 *baud = __res.bi_baudrate;
623 switch (mr1 & MPC52xx_PSC_MODE_BITS_MASK) {
624 case MPC52xx_PSC_MODE_5_BITS:
627 case MPC52xx_PSC_MODE_6_BITS:
630 case MPC52xx_PSC_MODE_7_BITS:
633 case MPC52xx_PSC_MODE_8_BITS:
638 if (mr1 & MPC52xx_PSC_MODE_PARNONE)
641 *parity = mr1 & MPC52xx_PSC_MODE_PARODD ? 'o' : 'e';
645 mpc52xx_console_write(struct console *co, const char *s, unsigned int count)
647 struct uart_port *port = &mpc52xx_uart_ports[co->index];
648 struct mpc52xx_psc __iomem *psc = PSC(port);
651 /* Disable interrupts */
652 out_be16(&psc->mpc52xx_psc_imr, 0);
654 /* Wait the TX buffer to be empty */
655 j = 5000000; /* Maximum wait */
656 while (!(in_be16(&psc->mpc52xx_psc_status) & MPC52xx_PSC_SR_TXEMP) &&
660 /* Write all the chars */
661 for (i = 0; i < count; i++, s++) {
662 /* Line return handling */
664 out_8(&psc->mpc52xx_psc_buffer_8, '\r');
667 out_8(&psc->mpc52xx_psc_buffer_8, *s);
669 /* Wait the TX buffer to be empty */
670 j = 20000; /* Maximum wait */
671 while (!(in_be16(&psc->mpc52xx_psc_status) &
672 MPC52xx_PSC_SR_TXEMP) && --j)
676 /* Restore interrupt state */
677 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
680 #if !defined(CONFIG_PPC_MERGE)
682 mpc52xx_console_setup(struct console *co, char *options)
684 struct uart_port *port = &mpc52xx_uart_ports[co->index];
686 int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
691 if (co->index < 0 || co->index >= MPC52xx_PSC_MAXNUM)
694 /* Basic port init. Needed since we use some uart_??? func before
695 * real init for early access */
696 spin_lock_init(&port->lock);
697 port->uartclk = __res.bi_ipbfreq / 2; /* Look at CTLR doc */
698 port->ops = &mpc52xx_uart_ops;
699 port->mapbase = MPC52xx_PA(MPC52xx_PSCx_OFFSET(co->index+1));
701 /* We ioremap ourself */
702 port->membase = ioremap(port->mapbase, MPC52xx_PSC_SIZE);
703 if (port->membase == NULL)
706 /* Setup the port parameters accoding to options */
708 uart_parse_options(options, &baud, &parity, &bits, &flow);
710 mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow);
712 return uart_set_options(port, co, baud, parity, bits, flow);
718 mpc52xx_console_setup(struct console *co, char *options)
720 struct uart_port *port = &mpc52xx_uart_ports[co->index];
721 struct device_node *np = mpc52xx_uart_nodes[co->index];
722 unsigned int ipb_freq;
726 int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
731 pr_debug("mpc52xx_console_setup co=%p, co->index=%i, options=%s\n",
732 co, co->index, options);
734 if ((co->index < 0) || (co->index > MPC52xx_PSC_MAXNUM)) {
735 pr_debug("PSC%x out of range\n", co->index);
740 pr_debug("PSC%x not found in device tree\n", co->index);
744 pr_debug("Console on ttyPSC%x is %s\n",
745 co->index, mpc52xx_uart_nodes[co->index]->full_name);
747 /* Fetch register locations */
748 ret = of_address_to_resource(np, 0, &res);
750 pr_debug("Could not get resources for PSC%x\n", co->index);
754 /* Search for bus-frequency property in this node or a parent */
755 ipb_freq = mpc52xx_find_ipb_freq(np);
757 pr_debug("Could not find IPB bus frequency!\n");
761 /* Basic port init. Needed since we use some uart_??? func before
762 * real init for early access */
763 spin_lock_init(&port->lock);
764 port->uartclk = ipb_freq / 2;
765 port->ops = &mpc52xx_uart_ops;
766 port->mapbase = res.start;
767 port->membase = ioremap(res.start, sizeof(struct mpc52xx_psc));
768 port->irq = irq_of_parse_and_map(np, 0);
770 if (port->membase == NULL)
773 pr_debug("mpc52xx-psc uart at %p, mapped to %p, irq=%x, freq=%i\n",
774 (void *)port->mapbase, port->membase,
775 port->irq, port->uartclk);
777 /* Setup the port parameters accoding to options */
779 uart_parse_options(options, &baud, &parity, &bits, &flow);
781 mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow);
783 pr_debug("Setting console parameters: %i %i%c1 flow=%c\n",
784 baud, bits, parity, flow);
786 return uart_set_options(port, co, baud, parity, bits, flow);
788 #endif /* defined(CONFIG_PPC_MERGE) */
791 static struct uart_driver mpc52xx_uart_driver;
793 static struct console mpc52xx_console = {
795 .write = mpc52xx_console_write,
796 .device = uart_console_device,
797 .setup = mpc52xx_console_setup,
798 .flags = CON_PRINTBUFFER,
799 .index = -1, /* Specified on the cmdline (e.g. console=ttyPSC0) */
800 .data = &mpc52xx_uart_driver,
805 mpc52xx_console_init(void)
807 #if defined(CONFIG_PPC_MERGE)
808 mpc52xx_uart_of_enumerate();
810 register_console(&mpc52xx_console);
814 console_initcall(mpc52xx_console_init);
816 #define MPC52xx_PSC_CONSOLE &mpc52xx_console
818 #define MPC52xx_PSC_CONSOLE NULL
822 /* ======================================================================== */
824 /* ======================================================================== */
826 static struct uart_driver mpc52xx_uart_driver = {
827 .driver_name = "mpc52xx_psc_uart",
828 .dev_name = "ttyPSC",
829 .major = SERIAL_PSC_MAJOR,
830 .minor = SERIAL_PSC_MINOR,
831 .nr = MPC52xx_PSC_MAXNUM,
832 .cons = MPC52xx_PSC_CONSOLE,
836 #if !defined(CONFIG_PPC_MERGE)
837 /* ======================================================================== */
838 /* Platform Driver */
839 /* ======================================================================== */
842 mpc52xx_uart_probe(struct platform_device *dev)
844 struct resource *res = dev->resource;
846 struct uart_port *port = NULL;
849 /* Check validity & presence */
851 if (idx < 0 || idx >= MPC52xx_PSC_MAXNUM)
854 if (!mpc52xx_match_psc_function(idx, "uart"))
857 /* Init the port structure */
858 port = &mpc52xx_uart_ports[idx];
860 spin_lock_init(&port->lock);
861 port->uartclk = __res.bi_ipbfreq / 2; /* Look at CTLR doc */
862 port->fifosize = 512;
863 port->iotype = UPIO_MEM;
864 port->flags = UPF_BOOT_AUTOCONF |
865 (uart_console(port) ? 0 : UPF_IOREMAP);
867 port->ops = &mpc52xx_uart_ops;
868 port->dev = &dev->dev;
870 /* Search for IRQ and mapbase */
871 for (i = 0 ; i < dev->num_resources ; i++, res++) {
872 if (res->flags & IORESOURCE_MEM)
873 port->mapbase = res->start;
874 else if (res->flags & IORESOURCE_IRQ)
875 port->irq = res->start;
877 if (!port->irq || !port->mapbase)
880 /* Add the port to the uart sub-system */
881 ret = uart_add_one_port(&mpc52xx_uart_driver, port);
883 platform_set_drvdata(dev, (void *)port);
889 mpc52xx_uart_remove(struct platform_device *dev)
891 struct uart_port *port = (struct uart_port *) platform_get_drvdata(dev);
893 platform_set_drvdata(dev, NULL);
896 uart_remove_one_port(&mpc52xx_uart_driver, port);
903 mpc52xx_uart_suspend(struct platform_device *dev, pm_message_t state)
905 struct uart_port *port = (struct uart_port *) platform_get_drvdata(dev);
908 uart_suspend_port(&mpc52xx_uart_driver, port);
914 mpc52xx_uart_resume(struct platform_device *dev)
916 struct uart_port *port = (struct uart_port *) platform_get_drvdata(dev);
919 uart_resume_port(&mpc52xx_uart_driver, port);
926 static struct platform_driver mpc52xx_uart_platform_driver = {
927 .probe = mpc52xx_uart_probe,
928 .remove = mpc52xx_uart_remove,
930 .suspend = mpc52xx_uart_suspend,
931 .resume = mpc52xx_uart_resume,
934 .owner = THIS_MODULE,
935 .name = "mpc52xx-psc",
938 #endif /* !defined(CONFIG_PPC_MERGE) */
941 #if defined(CONFIG_PPC_MERGE)
942 /* ======================================================================== */
943 /* OF Platform Driver */
944 /* ======================================================================== */
947 mpc52xx_uart_of_probe(struct of_device *op, const struct of_device_id *match)
950 unsigned int ipb_freq;
951 struct uart_port *port = NULL;
955 dev_dbg(&op->dev, "mpc52xx_uart_probe(op=%p, match=%p)\n", op, match);
957 /* Check validity & presence */
958 for (idx = 0; idx < MPC52xx_PSC_MAXNUM; idx++)
959 if (mpc52xx_uart_nodes[idx] == op->node)
961 if (idx >= MPC52xx_PSC_MAXNUM)
963 pr_debug("Found %s assigned to ttyPSC%x\n",
964 mpc52xx_uart_nodes[idx]->full_name, idx);
966 /* Search for bus-frequency property in this node or a parent */
967 ipb_freq = mpc52xx_find_ipb_freq(op->node);
969 dev_dbg(&op->dev, "Could not find IPB bus frequency!\n");
973 /* Init the port structure */
974 port = &mpc52xx_uart_ports[idx];
976 spin_lock_init(&port->lock);
977 port->uartclk = ipb_freq / 2;
978 port->fifosize = 512;
979 port->iotype = UPIO_MEM;
980 port->flags = UPF_BOOT_AUTOCONF |
981 (uart_console(port) ? 0 : UPF_IOREMAP);
983 port->ops = &mpc52xx_uart_ops;
984 port->dev = &op->dev;
986 /* Search for IRQ and mapbase */
987 ret = of_address_to_resource(op->node, 0, &res);
991 port->mapbase = res.start;
992 port->irq = irq_of_parse_and_map(op->node, 0);
994 dev_dbg(&op->dev, "mpc52xx-psc uart at %p, irq=%x, freq=%i\n",
995 (void *)port->mapbase, port->irq, port->uartclk);
997 if ((port->irq == NO_IRQ) || !port->mapbase) {
998 printk(KERN_ERR "Could not allocate resources for PSC\n");
1002 /* Add the port to the uart sub-system */
1003 ret = uart_add_one_port(&mpc52xx_uart_driver, port);
1005 dev_set_drvdata(&op->dev, (void *)port);
1011 mpc52xx_uart_of_remove(struct of_device *op)
1013 struct uart_port *port = dev_get_drvdata(&op->dev);
1014 dev_set_drvdata(&op->dev, NULL);
1017 uart_remove_one_port(&mpc52xx_uart_driver, port);
1018 irq_dispose_mapping(port->irq);
1026 mpc52xx_uart_of_suspend(struct of_device *op, pm_message_t state)
1028 struct uart_port *port = (struct uart_port *) dev_get_drvdata(&op->dev);
1031 uart_suspend_port(&mpc52xx_uart_driver, port);
1037 mpc52xx_uart_of_resume(struct of_device *op)
1039 struct uart_port *port = (struct uart_port *) dev_get_drvdata(&op->dev);
1042 uart_resume_port(&mpc52xx_uart_driver, port);
1049 mpc52xx_uart_of_assign(struct device_node *np, int idx)
1054 /* Find the first free node */
1055 for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
1056 if (mpc52xx_uart_nodes[i] == NULL) {
1062 if ((idx < 0) || (idx >= MPC52xx_PSC_MAXNUM))
1066 return; /* No free slot; abort */
1069 /* If the slot is already occupied, then swap slots */
1070 if (mpc52xx_uart_nodes[idx] && (free_idx != -1))
1071 mpc52xx_uart_nodes[free_idx] = mpc52xx_uart_nodes[idx];
1072 mpc52xx_uart_nodes[idx] = np;
1076 mpc52xx_uart_of_enumerate(void)
1078 static int enum_done;
1079 struct device_node *np;
1080 const unsigned int *devno;
1086 for_each_node_by_type(np, "serial") {
1087 if (!of_match_node(mpc52xx_uart_of_match, np))
1090 /* Is a particular device number requested? */
1091 devno = of_get_property(np, "port-number", NULL);
1092 mpc52xx_uart_of_assign(np, devno ? *devno : -1);
1097 for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
1098 if (mpc52xx_uart_nodes[i])
1099 pr_debug("%s assigned to ttyPSC%x\n",
1100 mpc52xx_uart_nodes[i]->full_name, i);
1104 MODULE_DEVICE_TABLE(of, mpc52xx_uart_of_match);
1106 static struct of_platform_driver mpc52xx_uart_of_driver = {
1107 .match_table = mpc52xx_uart_of_match,
1108 .probe = mpc52xx_uart_of_probe,
1109 .remove = mpc52xx_uart_of_remove,
1111 .suspend = mpc52xx_uart_of_suspend,
1112 .resume = mpc52xx_uart_of_resume,
1115 .name = "mpc52xx-psc-uart",
1118 #endif /* defined(CONFIG_PPC_MERGE) */
1121 /* ======================================================================== */
1123 /* ======================================================================== */
1126 mpc52xx_uart_init(void)
1130 printk(KERN_INFO "Serial: MPC52xx PSC UART driver\n");
1132 ret = uart_register_driver(&mpc52xx_uart_driver);
1134 printk(KERN_ERR "%s: uart_register_driver failed (%i)\n",
1139 #if defined(CONFIG_PPC_MERGE)
1140 mpc52xx_uart_of_enumerate();
1142 ret = of_register_platform_driver(&mpc52xx_uart_of_driver);
1144 printk(KERN_ERR "%s: of_register_platform_driver failed (%i)\n",
1146 uart_unregister_driver(&mpc52xx_uart_driver);
1150 ret = platform_driver_register(&mpc52xx_uart_platform_driver);
1152 printk(KERN_ERR "%s: platform_driver_register failed (%i)\n",
1154 uart_unregister_driver(&mpc52xx_uart_driver);
1163 mpc52xx_uart_exit(void)
1165 #if defined(CONFIG_PPC_MERGE)
1166 of_unregister_platform_driver(&mpc52xx_uart_of_driver);
1168 platform_driver_unregister(&mpc52xx_uart_platform_driver);
1170 uart_unregister_driver(&mpc52xx_uart_driver);
1174 module_init(mpc52xx_uart_init);
1175 module_exit(mpc52xx_uart_exit);
1177 MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
1178 MODULE_DESCRIPTION("Freescale MPC52xx PSC UART");
1179 MODULE_LICENSE("GPL");