1 // SPDX-License-Identifier: GPL-2.0
6 #if defined(CONFIG_SERIAL_NETX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
10 #include <linux/device.h>
11 #include <linux/module.h>
12 #include <linux/ioport.h>
13 #include <linux/init.h>
14 #include <linux/console.h>
15 #include <linux/sysrq.h>
16 #include <linux/platform_device.h>
17 #include <linux/tty.h>
18 #include <linux/tty_flip.h>
19 #include <linux/serial_core.h>
20 #include <linux/serial.h>
24 #include <mach/hardware.h>
25 #include <mach/netx-regs.h>
27 /* We've been assigned a range on the "Low-density serial ports" major */
28 #define SERIAL_NX_MAJOR 204
29 #define MINOR_START 170
35 UART_BAUDDIV_MSB = 0x0c,
36 UART_BAUDDIV_LSB = 0x10,
43 UART_RTS_TRAIL = 0x2c,
44 UART_DRV_ENABLE = 0x30,
46 UART_RXFIFO_IRQLEVEL = 0x38,
47 UART_TXFIFO_IRQLEVEL = 0x3c,
55 #define LINE_CR_BRK (1<<0)
56 #define LINE_CR_PEN (1<<1)
57 #define LINE_CR_EPS (1<<2)
58 #define LINE_CR_STP2 (1<<3)
59 #define LINE_CR_FEN (1<<4)
60 #define LINE_CR_5BIT (0<<5)
61 #define LINE_CR_6BIT (1<<5)
62 #define LINE_CR_7BIT (2<<5)
63 #define LINE_CR_8BIT (3<<5)
64 #define LINE_CR_BITS_MASK (3<<5)
66 #define CR_UART_EN (1<<0)
67 #define CR_SIREN (1<<1)
68 #define CR_SIRLP (1<<2)
69 #define CR_MSIE (1<<3)
72 #define CR_RTIE (1<<6)
78 #define FR_BUSY (1<<3)
79 #define FR_RXFE (1<<4)
80 #define FR_TXFF (1<<5)
81 #define FR_RXFF (1<<6)
82 #define FR_TXFE (1<<7)
84 #define IIR_MIS (1<<0)
85 #define IIR_RIS (1<<1)
86 #define IIR_TIS (1<<2)
87 #define IIR_RTIS (1<<3)
90 #define RTS_CR_AUTO (1<<0)
91 #define RTS_CR_RTS (1<<1)
92 #define RTS_CR_COUNT (1<<2)
93 #define RTS_CR_MOD2 (1<<3)
94 #define RTS_CR_RTS_POL (1<<4)
95 #define RTS_CR_CTS_CTR (1<<5)
96 #define RTS_CR_CTS_POL (1<<6)
97 #define RTS_CR_STICK (1<<7)
99 #define UART_PORT_SIZE 0x40
100 #define DRIVER_NAME "netx-uart"
103 struct uart_port port;
106 static void netx_stop_tx(struct uart_port *port)
109 val = readl(port->membase + UART_CR);
110 writel(val & ~CR_TIE, port->membase + UART_CR);
113 static void netx_stop_rx(struct uart_port *port)
116 val = readl(port->membase + UART_CR);
117 writel(val & ~CR_RIE, port->membase + UART_CR);
120 static void netx_enable_ms(struct uart_port *port)
123 val = readl(port->membase + UART_CR);
124 writel(val | CR_MSIE, port->membase + UART_CR);
127 static inline void netx_transmit_buffer(struct uart_port *port)
129 struct circ_buf *xmit = &port->state->xmit;
132 writel(port->x_char, port->membase + UART_DR);
138 if (uart_tx_stopped(port) || uart_circ_empty(xmit)) {
144 /* send xmit->buf[xmit->tail]
145 * out the port here */
146 writel(xmit->buf[xmit->tail], port->membase + UART_DR);
147 xmit->tail = (xmit->tail + 1) &
148 (UART_XMIT_SIZE - 1);
150 if (uart_circ_empty(xmit))
152 } while (!(readl(port->membase + UART_FR) & FR_TXFF));
154 if (uart_circ_empty(xmit))
158 static void netx_start_tx(struct uart_port *port)
161 readl(port->membase + UART_CR) | CR_TIE, port->membase + UART_CR);
163 if (!(readl(port->membase + UART_FR) & FR_TXFF))
164 netx_transmit_buffer(port);
167 static unsigned int netx_tx_empty(struct uart_port *port)
169 return readl(port->membase + UART_FR) & FR_BUSY ? 0 : TIOCSER_TEMT;
172 static void netx_txint(struct uart_port *port)
174 struct circ_buf *xmit = &port->state->xmit;
176 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
181 netx_transmit_buffer(port);
183 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
184 uart_write_wakeup(port);
187 static void netx_rxint(struct uart_port *port, unsigned long *flags)
189 unsigned char rx, flg, status;
191 while (!(readl(port->membase + UART_FR) & FR_RXFE)) {
192 rx = readl(port->membase + UART_DR);
195 status = readl(port->membase + UART_SR);
196 if (status & SR_BE) {
197 writel(0, port->membase + UART_SR);
198 if (uart_handle_break(port))
202 if (unlikely(status & (SR_FE | SR_PE | SR_OE))) {
205 port->icount.parity++;
206 else if (status & SR_FE)
207 port->icount.frame++;
209 port->icount.overrun++;
211 status &= port->read_status_mask;
215 else if (status & SR_PE)
217 else if (status & SR_FE)
221 if (uart_handle_sysrq_char(port, rx))
224 uart_insert_char(port, status, SR_OE, rx, flg);
227 spin_unlock_irqrestore(&port->lock, *flags);
228 tty_flip_buffer_push(&port->state->port);
229 spin_lock_irqsave(&port->lock, *flags);
232 static irqreturn_t netx_int(int irq, void *dev_id)
234 struct uart_port *port = dev_id;
236 unsigned char status;
238 spin_lock_irqsave(&port->lock,flags);
240 status = readl(port->membase + UART_IIR) & IIR_MASK;
242 if (status & IIR_RIS)
243 netx_rxint(port, &flags);
244 if (status & IIR_TIS)
246 if (status & IIR_MIS) {
247 if (readl(port->membase + UART_FR) & FR_CTS)
248 uart_handle_cts_change(port, 1);
250 uart_handle_cts_change(port, 0);
252 writel(0, port->membase + UART_IIR);
253 status = readl(port->membase + UART_IIR) & IIR_MASK;
256 spin_unlock_irqrestore(&port->lock,flags);
260 static unsigned int netx_get_mctrl(struct uart_port *port)
262 unsigned int ret = TIOCM_DSR | TIOCM_CAR;
264 if (readl(port->membase + UART_FR) & FR_CTS)
270 static void netx_set_mctrl(struct uart_port *port, unsigned int mctrl)
274 /* FIXME: Locking needed ? */
275 if (mctrl & TIOCM_RTS) {
276 val = readl(port->membase + UART_RTS_CR);
277 writel(val | RTS_CR_RTS, port->membase + UART_RTS_CR);
281 static void netx_break_ctl(struct uart_port *port, int break_state)
283 unsigned int line_cr;
284 spin_lock_irq(&port->lock);
286 line_cr = readl(port->membase + UART_LINE_CR);
287 if (break_state != 0)
288 line_cr |= LINE_CR_BRK;
290 line_cr &= ~LINE_CR_BRK;
291 writel(line_cr, port->membase + UART_LINE_CR);
293 spin_unlock_irq(&port->lock);
296 static int netx_startup(struct uart_port *port)
300 ret = request_irq(port->irq, netx_int, 0,
303 dev_err(port->dev, "unable to grab irq%d\n",port->irq);
307 writel(readl(port->membase + UART_LINE_CR) | LINE_CR_FEN,
308 port->membase + UART_LINE_CR);
310 writel(CR_MSIE | CR_RIE | CR_TIE | CR_RTIE | CR_UART_EN,
311 port->membase + UART_CR);
317 static void netx_shutdown(struct uart_port *port)
319 writel(0, port->membase + UART_CR) ;
321 free_irq(port->irq, port);
325 netx_set_termios(struct uart_port *port, struct ktermios *termios,
326 struct ktermios *old)
328 unsigned int baud, quot;
329 unsigned char old_cr;
330 unsigned char line_cr = LINE_CR_FEN;
331 unsigned char rts_cr = 0;
333 switch (termios->c_cflag & CSIZE) {
335 line_cr |= LINE_CR_5BIT;
338 line_cr |= LINE_CR_6BIT;
341 line_cr |= LINE_CR_7BIT;
344 line_cr |= LINE_CR_8BIT;
348 if (termios->c_cflag & CSTOPB)
349 line_cr |= LINE_CR_STP2;
351 if (termios->c_cflag & PARENB) {
352 line_cr |= LINE_CR_PEN;
353 if (!(termios->c_cflag & PARODD))
354 line_cr |= LINE_CR_EPS;
357 if (termios->c_cflag & CRTSCTS)
358 rts_cr = RTS_CR_AUTO | RTS_CR_CTS_CTR | RTS_CR_RTS_POL;
360 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
366 spin_lock_irq(&port->lock);
368 uart_update_timeout(port, termios->c_cflag, baud);
370 old_cr = readl(port->membase + UART_CR);
372 /* disable interrupts */
373 writel(old_cr & ~(CR_MSIE | CR_RIE | CR_TIE | CR_RTIE),
374 port->membase + UART_CR);
376 /* drain transmitter */
377 while (readl(port->membase + UART_FR) & FR_BUSY);
380 writel(old_cr & ~CR_UART_EN, port->membase + UART_CR);
382 /* modem status interrupts */
384 if (UART_ENABLE_MS(port, termios->c_cflag))
387 writel((quot>>8) & 0xff, port->membase + UART_BAUDDIV_MSB);
388 writel(quot & 0xff, port->membase + UART_BAUDDIV_LSB);
389 writel(line_cr, port->membase + UART_LINE_CR);
391 writel(rts_cr, port->membase + UART_RTS_CR);
394 * Characters to ignore
396 port->ignore_status_mask = 0;
397 if (termios->c_iflag & IGNPAR)
398 port->ignore_status_mask |= SR_PE;
399 if (termios->c_iflag & IGNBRK) {
400 port->ignore_status_mask |= SR_BE;
402 * If we're ignoring parity and break indicators,
403 * ignore overruns too (for real raw support).
405 if (termios->c_iflag & IGNPAR)
406 port->ignore_status_mask |= SR_PE;
409 port->read_status_mask = 0;
410 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
411 port->read_status_mask |= SR_BE;
412 if (termios->c_iflag & INPCK)
413 port->read_status_mask |= SR_PE | SR_FE;
415 writel(old_cr, port->membase + UART_CR);
417 spin_unlock_irq(&port->lock);
420 static const char *netx_type(struct uart_port *port)
422 return port->type == PORT_NETX ? "NETX" : NULL;
425 static void netx_release_port(struct uart_port *port)
427 release_mem_region(port->mapbase, UART_PORT_SIZE);
430 static int netx_request_port(struct uart_port *port)
432 return request_mem_region(port->mapbase, UART_PORT_SIZE,
433 DRIVER_NAME) != NULL ? 0 : -EBUSY;
436 static void netx_config_port(struct uart_port *port, int flags)
438 if (flags & UART_CONFIG_TYPE && netx_request_port(port) == 0)
439 port->type = PORT_NETX;
443 netx_verify_port(struct uart_port *port, struct serial_struct *ser)
447 if (ser->type != PORT_UNKNOWN && ser->type != PORT_NETX)
453 static struct uart_ops netx_pops = {
454 .tx_empty = netx_tx_empty,
455 .set_mctrl = netx_set_mctrl,
456 .get_mctrl = netx_get_mctrl,
457 .stop_tx = netx_stop_tx,
458 .start_tx = netx_start_tx,
459 .stop_rx = netx_stop_rx,
460 .enable_ms = netx_enable_ms,
461 .break_ctl = netx_break_ctl,
462 .startup = netx_startup,
463 .shutdown = netx_shutdown,
464 .set_termios = netx_set_termios,
466 .release_port = netx_release_port,
467 .request_port = netx_request_port,
468 .config_port = netx_config_port,
469 .verify_port = netx_verify_port,
472 static struct netx_port netx_ports[] = {
477 .membase = (char __iomem *)io_p2v(NETX_PA_UART0),
478 .mapbase = NETX_PA_UART0,
479 .irq = NETX_IRQ_UART0,
480 .uartclk = 100000000,
482 .flags = UPF_BOOT_AUTOCONF,
490 .membase = (char __iomem *)io_p2v(NETX_PA_UART1),
491 .mapbase = NETX_PA_UART1,
492 .irq = NETX_IRQ_UART1,
493 .uartclk = 100000000,
495 .flags = UPF_BOOT_AUTOCONF,
503 .membase = (char __iomem *)io_p2v(NETX_PA_UART2),
504 .mapbase = NETX_PA_UART2,
505 .irq = NETX_IRQ_UART2,
506 .uartclk = 100000000,
508 .flags = UPF_BOOT_AUTOCONF,
515 #ifdef CONFIG_SERIAL_NETX_CONSOLE
517 static void netx_console_putchar(struct uart_port *port, int ch)
519 while (readl(port->membase + UART_FR) & FR_BUSY);
520 writel(ch, port->membase + UART_DR);
524 netx_console_write(struct console *co, const char *s, unsigned int count)
526 struct uart_port *port = &netx_ports[co->index].port;
527 unsigned char cr_save;
529 cr_save = readl(port->membase + UART_CR);
530 writel(cr_save | CR_UART_EN, port->membase + UART_CR);
532 uart_console_write(port, s, count, netx_console_putchar);
534 while (readl(port->membase + UART_FR) & FR_BUSY);
535 writel(cr_save, port->membase + UART_CR);
539 netx_console_get_options(struct uart_port *port, int *baud,
540 int *parity, int *bits, int *flow)
542 unsigned char line_cr;
544 *baud = (readl(port->membase + UART_BAUDDIV_MSB) << 8) |
545 readl(port->membase + UART_BAUDDIV_LSB);
552 line_cr = readl(port->membase + UART_LINE_CR);
554 if (line_cr & LINE_CR_PEN) {
555 if (line_cr & LINE_CR_EPS)
561 switch (line_cr & LINE_CR_BITS_MASK) {
576 if (readl(port->membase + UART_RTS_CR) & RTS_CR_AUTO)
581 netx_console_setup(struct console *co, char *options)
583 struct netx_port *sport;
590 * Check whether an invalid uart number has been specified, and
591 * if so, search for the first available port that does have
594 if (co->index == -1 || co->index >= ARRAY_SIZE(netx_ports))
596 sport = &netx_ports[co->index];
599 uart_parse_options(options, &baud, &parity, &bits, &flow);
601 /* if the UART is enabled, assume it has been correctly setup
602 * by the bootloader and get the options
604 if (readl(sport->port.membase + UART_CR) & CR_UART_EN) {
605 netx_console_get_options(&sport->port, &baud,
606 &parity, &bits, &flow);
611 return uart_set_options(&sport->port, co, baud, parity, bits, flow);
614 static struct uart_driver netx_reg;
615 static struct console netx_console = {
617 .write = netx_console_write,
618 .device = uart_console_device,
619 .setup = netx_console_setup,
620 .flags = CON_PRINTBUFFER,
625 static int __init netx_console_init(void)
627 register_console(&netx_console);
630 console_initcall(netx_console_init);
632 #define NETX_CONSOLE &netx_console
634 #define NETX_CONSOLE NULL
637 static struct uart_driver netx_reg = {
638 .owner = THIS_MODULE,
639 .driver_name = DRIVER_NAME,
641 .major = SERIAL_NX_MAJOR,
642 .minor = MINOR_START,
643 .nr = ARRAY_SIZE(netx_ports),
644 .cons = NETX_CONSOLE,
647 static int serial_netx_suspend(struct platform_device *pdev, pm_message_t state)
649 struct netx_port *sport = platform_get_drvdata(pdev);
652 uart_suspend_port(&netx_reg, &sport->port);
657 static int serial_netx_resume(struct platform_device *pdev)
659 struct netx_port *sport = platform_get_drvdata(pdev);
662 uart_resume_port(&netx_reg, &sport->port);
667 static int serial_netx_probe(struct platform_device *pdev)
669 struct uart_port *port = &netx_ports[pdev->id].port;
671 dev_info(&pdev->dev, "initialising\n");
673 port->dev = &pdev->dev;
675 writel(1, port->membase + UART_RXFIFO_IRQLEVEL);
676 uart_add_one_port(&netx_reg, &netx_ports[pdev->id].port);
677 platform_set_drvdata(pdev, &netx_ports[pdev->id]);
682 static int serial_netx_remove(struct platform_device *pdev)
684 struct netx_port *sport = platform_get_drvdata(pdev);
687 uart_remove_one_port(&netx_reg, &sport->port);
692 static struct platform_driver serial_netx_driver = {
693 .probe = serial_netx_probe,
694 .remove = serial_netx_remove,
696 .suspend = serial_netx_suspend,
697 .resume = serial_netx_resume,
704 static int __init netx_serial_init(void)
708 printk(KERN_INFO "Serial: NetX driver\n");
710 ret = uart_register_driver(&netx_reg);
714 ret = platform_driver_register(&serial_netx_driver);
716 uart_unregister_driver(&netx_reg);
721 static void __exit netx_serial_exit(void)
723 platform_driver_unregister(&serial_netx_driver);
724 uart_unregister_driver(&netx_reg);
727 module_init(netx_serial_init);
728 module_exit(netx_serial_exit);
730 MODULE_AUTHOR("Sascha Hauer");
731 MODULE_DESCRIPTION("NetX serial port driver");
732 MODULE_LICENSE("GPL");
733 MODULE_ALIAS("platform:" DRIVER_NAME);