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 <asm/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))
117 /* Forward declaration of the interruption handling routine */
118 static irqreturn_t mpc52xx_uart_int(int irq,void *dev_id);
121 /* Simple macro to test if a port is console or not. This one is taken
122 * for serial_core.c and maybe should be moved to serial_core.h ? */
123 #ifdef CONFIG_SERIAL_CORE_CONSOLE
124 #define uart_console(port) ((port)->cons && (port)->cons->index == (port)->line)
126 #define uart_console(port) (0)
129 #if defined(CONFIG_PPC_MERGE)
130 static struct of_device_id mpc52xx_uart_of_match[] = {
131 { .type = "serial", .compatible = "mpc5200-psc-uart", },
137 /* ======================================================================== */
138 /* UART operations */
139 /* ======================================================================== */
142 mpc52xx_uart_tx_empty(struct uart_port *port)
144 int status = in_be16(&PSC(port)->mpc52xx_psc_status);
145 return (status & MPC52xx_PSC_SR_TXEMP) ? TIOCSER_TEMT : 0;
149 mpc52xx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
151 /* Not implemented */
155 mpc52xx_uart_get_mctrl(struct uart_port *port)
157 /* Not implemented */
158 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
162 mpc52xx_uart_stop_tx(struct uart_port *port)
164 /* port->lock taken by caller */
165 port->read_status_mask &= ~MPC52xx_PSC_IMR_TXRDY;
166 out_be16(&PSC(port)->mpc52xx_psc_imr,port->read_status_mask);
170 mpc52xx_uart_start_tx(struct uart_port *port)
172 /* port->lock taken by caller */
173 port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY;
174 out_be16(&PSC(port)->mpc52xx_psc_imr,port->read_status_mask);
178 mpc52xx_uart_send_xchar(struct uart_port *port, char ch)
181 spin_lock_irqsave(&port->lock, flags);
185 /* Make sure tx interrupts are on */
186 /* Truly necessary ??? They should be anyway */
187 port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY;
188 out_be16(&PSC(port)->mpc52xx_psc_imr,port->read_status_mask);
191 spin_unlock_irqrestore(&port->lock, flags);
195 mpc52xx_uart_stop_rx(struct uart_port *port)
197 /* port->lock taken by caller */
198 port->read_status_mask &= ~MPC52xx_PSC_IMR_RXRDY;
199 out_be16(&PSC(port)->mpc52xx_psc_imr,port->read_status_mask);
203 mpc52xx_uart_enable_ms(struct uart_port *port)
205 /* Not implemented */
209 mpc52xx_uart_break_ctl(struct uart_port *port, int ctl)
212 spin_lock_irqsave(&port->lock, flags);
215 out_8(&PSC(port)->command,MPC52xx_PSC_START_BRK);
217 out_8(&PSC(port)->command,MPC52xx_PSC_STOP_BRK);
219 spin_unlock_irqrestore(&port->lock, flags);
223 mpc52xx_uart_startup(struct uart_port *port)
225 struct mpc52xx_psc __iomem *psc = PSC(port);
229 ret = request_irq(port->irq, mpc52xx_uart_int,
230 IRQF_DISABLED | IRQF_SAMPLE_RANDOM, "mpc52xx_psc_uart", port);
234 /* Reset/activate the port, clear and enable interrupts */
235 out_8(&psc->command,MPC52xx_PSC_RST_RX);
236 out_8(&psc->command,MPC52xx_PSC_RST_TX);
238 out_be32(&psc->sicr,0); /* UART mode DCD ignored */
240 out_be16(&psc->mpc52xx_psc_clock_select, 0xdd00); /* /16 prescaler on */
242 out_8(&psc->rfcntl, 0x00);
243 out_be16(&psc->rfalarm, 0x1ff);
244 out_8(&psc->tfcntl, 0x07);
245 out_be16(&psc->tfalarm, 0x80);
247 port->read_status_mask |= MPC52xx_PSC_IMR_RXRDY | MPC52xx_PSC_IMR_TXRDY;
248 out_be16(&psc->mpc52xx_psc_imr,port->read_status_mask);
250 out_8(&psc->command,MPC52xx_PSC_TX_ENABLE);
251 out_8(&psc->command,MPC52xx_PSC_RX_ENABLE);
257 mpc52xx_uart_shutdown(struct uart_port *port)
259 struct mpc52xx_psc __iomem *psc = PSC(port);
261 /* Shut down the port. Leave TX active if on a console port */
262 out_8(&psc->command,MPC52xx_PSC_RST_RX);
263 if (!uart_console(port))
264 out_8(&psc->command,MPC52xx_PSC_RST_TX);
266 port->read_status_mask = 0;
267 out_be16(&psc->mpc52xx_psc_imr,port->read_status_mask);
269 /* Release interrupt */
270 free_irq(port->irq, port);
274 mpc52xx_uart_set_termios(struct uart_port *port, struct ktermios *new,
275 struct ktermios *old)
277 struct mpc52xx_psc __iomem *psc = PSC(port);
279 unsigned char mr1, mr2;
281 unsigned int j, baud, quot;
283 /* Prepare what we're gonna write */
286 switch (new->c_cflag & CSIZE) {
287 case CS5: mr1 |= MPC52xx_PSC_MODE_5_BITS;
289 case CS6: mr1 |= MPC52xx_PSC_MODE_6_BITS;
291 case CS7: mr1 |= MPC52xx_PSC_MODE_7_BITS;
294 default: mr1 |= MPC52xx_PSC_MODE_8_BITS;
297 if (new->c_cflag & PARENB) {
298 mr1 |= (new->c_cflag & PARODD) ?
299 MPC52xx_PSC_MODE_PARODD : MPC52xx_PSC_MODE_PAREVEN;
301 mr1 |= MPC52xx_PSC_MODE_PARNONE;
306 if (new->c_cflag & CSTOPB)
307 mr2 |= MPC52xx_PSC_MODE_TWO_STOP;
309 mr2 |= ((new->c_cflag & CSIZE) == CS5) ?
310 MPC52xx_PSC_MODE_ONE_STOP_5_BITS :
311 MPC52xx_PSC_MODE_ONE_STOP;
314 baud = uart_get_baud_rate(port, new, old, 0, port->uartclk/16);
315 quot = uart_get_divisor(port, baud);
319 spin_lock_irqsave(&port->lock, flags);
321 /* Update the per-port timeout */
322 uart_update_timeout(port, new->c_cflag, baud);
324 /* Do our best to flush TX & RX, so we don't loose anything */
325 /* But we don't wait indefinitly ! */
326 j = 5000000; /* Maximum wait */
327 /* FIXME Can't receive chars since set_termios might be called at early
328 * boot for the console, all stuff is not yet ready to receive at that
329 * time and that just makes the kernel oops */
330 /* while (j-- && mpc52xx_uart_int_rx_chars(port)); */
331 while (!(in_be16(&psc->mpc52xx_psc_status) & MPC52xx_PSC_SR_TXEMP) &&
336 printk( KERN_ERR "mpc52xx_uart.c: "
337 "Unable to flush RX & TX fifos in-time in set_termios."
338 "Some chars may have been lost.\n" );
340 /* Reset the TX & RX */
341 out_8(&psc->command,MPC52xx_PSC_RST_RX);
342 out_8(&psc->command,MPC52xx_PSC_RST_TX);
344 /* Send new mode settings */
345 out_8(&psc->command,MPC52xx_PSC_SEL_MODE_REG_1);
346 out_8(&psc->mode,mr1);
347 out_8(&psc->mode,mr2);
348 out_8(&psc->ctur,ctr >> 8);
349 out_8(&psc->ctlr,ctr & 0xff);
351 /* Reenable TX & RX */
352 out_8(&psc->command,MPC52xx_PSC_TX_ENABLE);
353 out_8(&psc->command,MPC52xx_PSC_RX_ENABLE);
355 /* We're all set, release the lock */
356 spin_unlock_irqrestore(&port->lock, flags);
360 mpc52xx_uart_type(struct uart_port *port)
362 return port->type == PORT_MPC52xx ? "MPC52xx PSC" : NULL;
366 mpc52xx_uart_release_port(struct uart_port *port)
368 if (port->flags & UPF_IOREMAP) { /* remapped by us ? */
369 iounmap(port->membase);
370 port->membase = NULL;
373 release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc));
377 mpc52xx_uart_request_port(struct uart_port *port)
381 if (port->flags & UPF_IOREMAP) /* Need to remap ? */
382 port->membase = ioremap(port->mapbase,
383 sizeof(struct mpc52xx_psc));
388 err = request_mem_region(port->mapbase, sizeof(struct mpc52xx_psc),
389 "mpc52xx_psc_uart") != NULL ? 0 : -EBUSY;
391 if (err && (port->flags & UPF_IOREMAP)) {
392 iounmap(port->membase);
393 port->membase = NULL;
400 mpc52xx_uart_config_port(struct uart_port *port, int flags)
402 if ( (flags & UART_CONFIG_TYPE) &&
403 (mpc52xx_uart_request_port(port) == 0) )
404 port->type = PORT_MPC52xx;
408 mpc52xx_uart_verify_port(struct uart_port *port, struct serial_struct *ser)
410 if ( ser->type != PORT_UNKNOWN && ser->type != PORT_MPC52xx )
413 if ( (ser->irq != port->irq) ||
414 (ser->io_type != SERIAL_IO_MEM) ||
415 (ser->baud_base != port->uartclk) ||
416 (ser->iomem_base != (void*)port->mapbase) ||
424 static struct uart_ops mpc52xx_uart_ops = {
425 .tx_empty = mpc52xx_uart_tx_empty,
426 .set_mctrl = mpc52xx_uart_set_mctrl,
427 .get_mctrl = mpc52xx_uart_get_mctrl,
428 .stop_tx = mpc52xx_uart_stop_tx,
429 .start_tx = mpc52xx_uart_start_tx,
430 .send_xchar = mpc52xx_uart_send_xchar,
431 .stop_rx = mpc52xx_uart_stop_rx,
432 .enable_ms = mpc52xx_uart_enable_ms,
433 .break_ctl = mpc52xx_uart_break_ctl,
434 .startup = mpc52xx_uart_startup,
435 .shutdown = mpc52xx_uart_shutdown,
436 .set_termios = mpc52xx_uart_set_termios,
437 /* .pm = mpc52xx_uart_pm, Not supported yet */
438 /* .set_wake = mpc52xx_uart_set_wake, Not supported yet */
439 .type = mpc52xx_uart_type,
440 .release_port = mpc52xx_uart_release_port,
441 .request_port = mpc52xx_uart_request_port,
442 .config_port = mpc52xx_uart_config_port,
443 .verify_port = mpc52xx_uart_verify_port
447 /* ======================================================================== */
448 /* Interrupt handling */
449 /* ======================================================================== */
452 mpc52xx_uart_int_rx_chars(struct uart_port *port)
454 struct tty_struct *tty = port->info->tty;
455 unsigned char ch, flag;
456 unsigned short status;
458 /* While we can read, do so ! */
459 while ( (status = in_be16(&PSC(port)->mpc52xx_psc_status)) &
460 MPC52xx_PSC_SR_RXRDY) {
463 ch = in_8(&PSC(port)->mpc52xx_psc_buffer_8);
465 /* Handle sysreq char */
467 if (uart_handle_sysrq_char(port, ch)) {
478 if ( status & (MPC52xx_PSC_SR_PE |
480 MPC52xx_PSC_SR_RB) ) {
482 if (status & MPC52xx_PSC_SR_RB) {
484 uart_handle_break(port);
485 } else if (status & MPC52xx_PSC_SR_PE)
487 else if (status & MPC52xx_PSC_SR_FE)
490 /* Clear error condition */
491 out_8(&PSC(port)->command,MPC52xx_PSC_RST_ERR_STAT);
494 tty_insert_flip_char(tty, ch, flag);
495 if (status & MPC52xx_PSC_SR_OE) {
497 * Overrun is special, since it's
498 * reported immediately, and doesn't
499 * affect the current character
501 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
505 tty_flip_buffer_push(tty);
507 return in_be16(&PSC(port)->mpc52xx_psc_status) & MPC52xx_PSC_SR_RXRDY;
511 mpc52xx_uart_int_tx_chars(struct uart_port *port)
513 struct circ_buf *xmit = &port->info->xmit;
515 /* Process out of band chars */
517 out_8(&PSC(port)->mpc52xx_psc_buffer_8, port->x_char);
523 /* Nothing to do ? */
524 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
525 mpc52xx_uart_stop_tx(port);
530 while (in_be16(&PSC(port)->mpc52xx_psc_status) & MPC52xx_PSC_SR_TXRDY) {
531 out_8(&PSC(port)->mpc52xx_psc_buffer_8, xmit->buf[xmit->tail]);
532 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
534 if (uart_circ_empty(xmit))
539 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
540 uart_write_wakeup(port);
542 /* Maybe we're done after all */
543 if (uart_circ_empty(xmit)) {
544 mpc52xx_uart_stop_tx(port);
552 mpc52xx_uart_int(int irq, void *dev_id)
554 struct uart_port *port = dev_id;
555 unsigned long pass = ISR_PASS_LIMIT;
556 unsigned int keepgoing;
557 unsigned short status;
559 spin_lock(&port->lock);
561 /* While we have stuff to do, we continue */
563 /* If we don't find anything to do, we stop */
567 status = in_be16(&PSC(port)->mpc52xx_psc_isr);
568 status &= port->read_status_mask;
570 /* Do we need to receive chars ? */
571 /* For this RX interrupts must be on and some chars waiting */
572 if ( status & MPC52xx_PSC_IMR_RXRDY )
573 keepgoing |= mpc52xx_uart_int_rx_chars(port);
575 /* Do we need to send chars ? */
576 /* For this, TX must be ready and TX interrupt enabled */
577 if ( status & MPC52xx_PSC_IMR_TXRDY )
578 keepgoing |= mpc52xx_uart_int_tx_chars(port);
580 /* Limit number of iteration */
586 spin_unlock(&port->lock);
592 /* ======================================================================== */
593 /* Console ( if applicable ) */
594 /* ======================================================================== */
596 #ifdef CONFIG_SERIAL_MPC52xx_CONSOLE
599 mpc52xx_console_get_options(struct uart_port *port,
600 int *baud, int *parity, int *bits, int *flow)
602 struct mpc52xx_psc __iomem *psc = PSC(port);
605 pr_debug("mpc52xx_console_get_options(port=%p)\n", port);
607 /* Read the mode registers */
608 out_8(&psc->command,MPC52xx_PSC_SEL_MODE_REG_1);
609 mr1 = in_8(&psc->mode);
611 /* CT{U,L}R are write-only ! */
612 *baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
613 #if !defined(CONFIG_PPC_MERGE)
614 if (__res.bi_baudrate)
615 *baud = __res.bi_baudrate;
619 switch (mr1 & MPC52xx_PSC_MODE_BITS_MASK) {
620 case MPC52xx_PSC_MODE_5_BITS: *bits = 5; break;
621 case MPC52xx_PSC_MODE_6_BITS: *bits = 6; break;
622 case MPC52xx_PSC_MODE_7_BITS: *bits = 7; break;
623 case MPC52xx_PSC_MODE_8_BITS:
627 if (mr1 & MPC52xx_PSC_MODE_PARNONE)
630 *parity = mr1 & MPC52xx_PSC_MODE_PARODD ? 'o' : 'e';
634 mpc52xx_console_write(struct console *co, const char *s, unsigned int count)
636 struct uart_port *port = &mpc52xx_uart_ports[co->index];
637 struct mpc52xx_psc __iomem *psc = PSC(port);
640 /* Disable interrupts */
641 out_be16(&psc->mpc52xx_psc_imr, 0);
643 /* Wait the TX buffer to be empty */
644 j = 5000000; /* Maximum wait */
645 while (!(in_be16(&psc->mpc52xx_psc_status) & MPC52xx_PSC_SR_TXEMP) &&
649 /* Write all the chars */
650 for (i = 0; i < count; i++, s++) {
651 /* Line return handling */
653 out_8(&psc->mpc52xx_psc_buffer_8, '\r');
656 out_8(&psc->mpc52xx_psc_buffer_8, *s);
658 /* Wait the TX buffer to be empty */
659 j = 20000; /* Maximum wait */
660 while (!(in_be16(&psc->mpc52xx_psc_status) &
661 MPC52xx_PSC_SR_TXEMP) && --j)
665 /* Restore interrupt state */
666 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
669 #if !defined(CONFIG_PPC_MERGE)
671 mpc52xx_console_setup(struct console *co, char *options)
673 struct uart_port *port = &mpc52xx_uart_ports[co->index];
675 int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
680 if (co->index < 0 || co->index >= MPC52xx_PSC_MAXNUM)
683 /* Basic port init. Needed since we use some uart_??? func before
684 * real init for early access */
685 spin_lock_init(&port->lock);
686 port->uartclk = __res.bi_ipbfreq / 2; /* Look at CTLR doc */
687 port->ops = &mpc52xx_uart_ops;
688 port->mapbase = MPC52xx_PA(MPC52xx_PSCx_OFFSET(co->index+1));
690 /* We ioremap ourself */
691 port->membase = ioremap(port->mapbase, MPC52xx_PSC_SIZE);
692 if (port->membase == NULL)
695 /* Setup the port parameters accoding to options */
697 uart_parse_options(options, &baud, &parity, &bits, &flow);
699 mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow);
701 return uart_set_options(port, co, baud, parity, bits, flow);
707 mpc52xx_console_setup(struct console *co, char *options)
709 struct uart_port *port = &mpc52xx_uart_ports[co->index];
710 struct device_node *np = mpc52xx_uart_nodes[co->index];
711 unsigned int ipb_freq;
715 int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
720 pr_debug("mpc52xx_console_setup co=%p, co->index=%i, options=%s\n",
721 co, co->index, options);
723 if ((co->index < 0) || (co->index > MPC52xx_PSC_MAXNUM)) {
724 pr_debug("PSC%x out of range\n", co->index);
729 pr_debug("PSC%x not found in device tree\n", co->index);
733 pr_debug("Console on ttyPSC%x is %s\n",
734 co->index, mpc52xx_uart_nodes[co->index]->full_name);
736 /* Fetch register locations */
737 if ((ret = of_address_to_resource(np, 0, &res)) != 0) {
738 pr_debug("Could not get resources for PSC%x\n", co->index);
742 /* Search for bus-frequency property in this node or a parent */
743 if ((ipb_freq = mpc52xx_find_ipb_freq(np)) == 0) {
744 pr_debug("Could not find IPB bus frequency!\n");
748 /* Basic port init. Needed since we use some uart_??? func before
749 * real init for early access */
750 spin_lock_init(&port->lock);
751 port->uartclk = ipb_freq / 2;
752 port->ops = &mpc52xx_uart_ops;
753 port->mapbase = res.start;
754 port->membase = ioremap(res.start, sizeof(struct mpc52xx_psc));
755 port->irq = irq_of_parse_and_map(np, 0);
757 if (port->membase == NULL)
760 pr_debug("mpc52xx-psc uart at %p, mapped to %p, irq=%x, freq=%i\n",
761 (void*)port->mapbase, port->membase, port->irq, port->uartclk);
763 /* Setup the port parameters accoding to options */
765 uart_parse_options(options, &baud, &parity, &bits, &flow);
767 mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow);
769 pr_debug("Setting console parameters: %i %i%c1 flow=%c\n",
770 baud, bits, parity, flow);
772 return uart_set_options(port, co, baud, parity, bits, flow);
774 #endif /* defined(CONFIG_PPC_MERGE) */
777 static struct uart_driver mpc52xx_uart_driver;
779 static struct console mpc52xx_console = {
781 .write = mpc52xx_console_write,
782 .device = uart_console_device,
783 .setup = mpc52xx_console_setup,
784 .flags = CON_PRINTBUFFER,
785 .index = -1, /* Specified on the cmdline (e.g. console=ttyPSC0 ) */
786 .data = &mpc52xx_uart_driver,
791 mpc52xx_console_init(void)
793 #if defined(CONFIG_PPC_MERGE)
794 mpc52xx_uart_of_enumerate();
796 register_console(&mpc52xx_console);
800 console_initcall(mpc52xx_console_init);
802 #define MPC52xx_PSC_CONSOLE &mpc52xx_console
804 #define MPC52xx_PSC_CONSOLE NULL
808 /* ======================================================================== */
810 /* ======================================================================== */
812 static struct uart_driver mpc52xx_uart_driver = {
813 .owner = THIS_MODULE,
814 .driver_name = "mpc52xx_psc_uart",
815 .dev_name = "ttyPSC",
816 .major = SERIAL_PSC_MAJOR,
817 .minor = SERIAL_PSC_MINOR,
818 .nr = MPC52xx_PSC_MAXNUM,
819 .cons = MPC52xx_PSC_CONSOLE,
823 #if !defined(CONFIG_PPC_MERGE)
824 /* ======================================================================== */
825 /* Platform Driver */
826 /* ======================================================================== */
829 mpc52xx_uart_probe(struct platform_device *dev)
831 struct resource *res = dev->resource;
833 struct uart_port *port = NULL;
836 /* Check validity & presence */
838 if (idx < 0 || idx >= MPC52xx_PSC_MAXNUM)
841 if (!mpc52xx_match_psc_function(idx,"uart"))
844 /* Init the port structure */
845 port = &mpc52xx_uart_ports[idx];
847 spin_lock_init(&port->lock);
848 port->uartclk = __res.bi_ipbfreq / 2; /* Look at CTLR doc */
849 port->fifosize = 512;
850 port->iotype = UPIO_MEM;
851 port->flags = UPF_BOOT_AUTOCONF |
852 ( uart_console(port) ? 0 : UPF_IOREMAP );
854 port->ops = &mpc52xx_uart_ops;
855 port->dev = &dev->dev;
857 /* Search for IRQ and mapbase */
858 for (i=0 ; i<dev->num_resources ; i++, res++) {
859 if (res->flags & IORESOURCE_MEM)
860 port->mapbase = res->start;
861 else if (res->flags & IORESOURCE_IRQ)
862 port->irq = res->start;
864 if (!port->irq || !port->mapbase)
867 /* Add the port to the uart sub-system */
868 ret = uart_add_one_port(&mpc52xx_uart_driver, port);
870 platform_set_drvdata(dev, (void*)port);
876 mpc52xx_uart_remove(struct platform_device *dev)
878 struct uart_port *port = (struct uart_port *) platform_get_drvdata(dev);
880 platform_set_drvdata(dev, NULL);
883 uart_remove_one_port(&mpc52xx_uart_driver, port);
890 mpc52xx_uart_suspend(struct platform_device *dev, pm_message_t state)
892 struct uart_port *port = (struct uart_port *) platform_get_drvdata(dev);
895 uart_suspend_port(&mpc52xx_uart_driver, port);
901 mpc52xx_uart_resume(struct platform_device *dev)
903 struct uart_port *port = (struct uart_port *) platform_get_drvdata(dev);
906 uart_resume_port(&mpc52xx_uart_driver, port);
913 static struct platform_driver mpc52xx_uart_platform_driver = {
914 .probe = mpc52xx_uart_probe,
915 .remove = mpc52xx_uart_remove,
917 .suspend = mpc52xx_uart_suspend,
918 .resume = mpc52xx_uart_resume,
921 .name = "mpc52xx-psc",
924 #endif /* !defined(CONFIG_PPC_MERGE) */
927 #if defined(CONFIG_PPC_MERGE)
928 /* ======================================================================== */
929 /* OF Platform Driver */
930 /* ======================================================================== */
933 mpc52xx_uart_of_probe(struct of_device *op, const struct of_device_id *match)
936 unsigned int ipb_freq;
937 struct uart_port *port = NULL;
941 dev_dbg(&op->dev, "mpc52xx_uart_probe(op=%p, match=%p)\n", op, match);
943 /* Check validity & presence */
944 for (idx = 0; idx < MPC52xx_PSC_MAXNUM; idx++)
945 if (mpc52xx_uart_nodes[idx] == op->node)
947 if (idx >= MPC52xx_PSC_MAXNUM)
949 pr_debug("Found %s assigned to ttyPSC%x\n",
950 mpc52xx_uart_nodes[idx]->full_name, idx);
952 /* Search for bus-frequency property in this node or a parent */
953 if ((ipb_freq = mpc52xx_find_ipb_freq(op->node)) == 0) {
954 dev_dbg(&op->dev, "Could not find IPB bus frequency!\n");
958 /* Init the port structure */
959 port = &mpc52xx_uart_ports[idx];
961 spin_lock_init(&port->lock);
962 port->uartclk = ipb_freq / 2;
963 port->fifosize = 512;
964 port->iotype = UPIO_MEM;
965 port->flags = UPF_BOOT_AUTOCONF |
966 ( uart_console(port) ? 0 : UPF_IOREMAP );
968 port->ops = &mpc52xx_uart_ops;
969 port->dev = &op->dev;
971 /* Search for IRQ and mapbase */
972 if ((ret = of_address_to_resource(op->node, 0, &res)) != 0)
975 port->mapbase = res.start;
976 port->irq = irq_of_parse_and_map(op->node, 0);
978 dev_dbg(&op->dev, "mpc52xx-psc uart at %p, irq=%x, freq=%i\n",
979 (void*)port->mapbase, port->irq, port->uartclk);
981 if ((port->irq==NO_IRQ) || !port->mapbase) {
982 printk(KERN_ERR "Could not allocate resources for PSC\n");
986 /* Add the port to the uart sub-system */
987 ret = uart_add_one_port(&mpc52xx_uart_driver, port);
989 dev_set_drvdata(&op->dev, (void*)port);
995 mpc52xx_uart_of_remove(struct of_device *op)
997 struct uart_port *port = dev_get_drvdata(&op->dev);
998 dev_set_drvdata(&op->dev, NULL);
1001 uart_remove_one_port(&mpc52xx_uart_driver, port);
1002 irq_dispose_mapping(port->irq);
1010 mpc52xx_uart_of_suspend(struct of_device *op, pm_message_t state)
1012 struct uart_port *port = (struct uart_port *) dev_get_drvdata(&op->dev);
1015 uart_suspend_port(&mpc52xx_uart_driver, port);
1021 mpc52xx_uart_of_resume(struct of_device *op)
1023 struct uart_port *port = (struct uart_port *) dev_get_drvdata(&op->dev);
1026 uart_resume_port(&mpc52xx_uart_driver, port);
1033 mpc52xx_uart_of_assign(struct device_node *np, int idx)
1038 /* Find the first free node */
1039 for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
1040 if (mpc52xx_uart_nodes[i] == NULL) {
1046 if ((idx < 0) || (idx >= MPC52xx_PSC_MAXNUM))
1050 return; /* No free slot; abort */
1052 /* If the slot is already occupied, then swap slots */
1053 if (mpc52xx_uart_nodes[idx] && (free_idx != -1))
1054 mpc52xx_uart_nodes[free_idx] = mpc52xx_uart_nodes[idx];
1055 mpc52xx_uart_nodes[idx] = np;
1059 mpc52xx_uart_of_enumerate(void)
1061 static int enum_done = 0;
1062 struct device_node *np;
1063 const unsigned int *devno;
1069 for_each_node_by_type(np, "serial") {
1070 if (!of_match_node(mpc52xx_uart_of_match, np))
1073 /* Is a particular device number requested? */
1074 devno = of_get_property(np, "port-number", NULL);
1075 mpc52xx_uart_of_assign(of_node_get(np), devno ? *devno : -1);
1080 for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
1081 if (mpc52xx_uart_nodes[i])
1082 pr_debug("%s assigned to ttyPSC%x\n",
1083 mpc52xx_uart_nodes[i]->full_name, i);
1087 MODULE_DEVICE_TABLE(of, mpc52xx_uart_of_match);
1089 static struct of_platform_driver mpc52xx_uart_of_driver = {
1090 .owner = THIS_MODULE,
1091 .name = "mpc52xx-psc-uart",
1092 .match_table = mpc52xx_uart_of_match,
1093 .probe = mpc52xx_uart_of_probe,
1094 .remove = mpc52xx_uart_of_remove,
1096 .suspend = mpc52xx_uart_of_suspend,
1097 .resume = mpc52xx_uart_of_resume,
1100 .name = "mpc52xx-psc-uart",
1103 #endif /* defined(CONFIG_PPC_MERGE) */
1106 /* ======================================================================== */
1108 /* ======================================================================== */
1111 mpc52xx_uart_init(void)
1115 printk(KERN_INFO "Serial: MPC52xx PSC UART driver\n");
1117 if ((ret = uart_register_driver(&mpc52xx_uart_driver)) != 0) {
1118 printk(KERN_ERR "%s: uart_register_driver failed (%i)\n",
1123 #if defined(CONFIG_PPC_MERGE)
1124 mpc52xx_uart_of_enumerate();
1126 ret = of_register_platform_driver(&mpc52xx_uart_of_driver);
1128 printk(KERN_ERR "%s: of_register_platform_driver failed (%i)\n",
1130 uart_unregister_driver(&mpc52xx_uart_driver);
1134 ret = platform_driver_register(&mpc52xx_uart_platform_driver);
1136 printk(KERN_ERR "%s: platform_driver_register failed (%i)\n",
1138 uart_unregister_driver(&mpc52xx_uart_driver);
1147 mpc52xx_uart_exit(void)
1149 #if defined(CONFIG_PPC_MERGE)
1150 of_unregister_platform_driver(&mpc52xx_uart_of_driver);
1152 platform_driver_unregister(&mpc52xx_uart_platform_driver);
1154 uart_unregister_driver(&mpc52xx_uart_driver);
1158 module_init(mpc52xx_uart_init);
1159 module_exit(mpc52xx_uart_exit);
1161 MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
1162 MODULE_DESCRIPTION("Freescale MPC52xx PSC UART");
1163 MODULE_LICENSE("GPL");