+++ /dev/null
-/*
- * SC268xx.c: Serial driver for Philiphs SC2681/SC2692 devices.
- *
- * Copyright (C) 2006,2007 Thomas Bogendörfer (tsbogend@alpha.franken.de)
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/tty.h>
-#include <linux/tty_flip.h>
-#include <linux/major.h>
-#include <linux/circ_buf.h>
-#include <linux/serial.h>
-#include <linux/sysrq.h>
-#include <linux/console.h>
-#include <linux/spinlock.h>
-#include <linux/slab.h>
-#include <linux/delay.h>
-#include <linux/init.h>
-#include <linux/platform_device.h>
-#include <linux/irq.h>
-
-#if defined(CONFIG_MAGIC_SYSRQ)
-#define SUPPORT_SYSRQ
-#endif
-
-#include <linux/serial_core.h>
-
-#define SC26XX_MAJOR 204
-#define SC26XX_MINOR_START 205
-#define SC26XX_NR 2
-
-struct uart_sc26xx_port {
- struct uart_port port[2];
- u8 dsr_mask[2];
- u8 cts_mask[2];
- u8 dcd_mask[2];
- u8 ri_mask[2];
- u8 dtr_mask[2];
- u8 rts_mask[2];
- u8 imr;
-};
-
-/* register common to both ports */
-#define RD_ISR 0x14
-#define RD_IPR 0x34
-
-#define WR_ACR 0x10
-#define WR_IMR 0x14
-#define WR_OPCR 0x34
-#define WR_OPR_SET 0x38
-#define WR_OPR_CLR 0x3C
-
-/* access common register */
-#define READ_SC(p, r) readb((p)->membase + RD_##r)
-#define WRITE_SC(p, r, v) writeb((v), (p)->membase + WR_##r)
-
-/* register per port */
-#define RD_PORT_MRx 0x00
-#define RD_PORT_SR 0x04
-#define RD_PORT_RHR 0x0c
-
-#define WR_PORT_MRx 0x00
-#define WR_PORT_CSR 0x04
-#define WR_PORT_CR 0x08
-#define WR_PORT_THR 0x0c
-
-/* SR bits */
-#define SR_BREAK (1 << 7)
-#define SR_FRAME (1 << 6)
-#define SR_PARITY (1 << 5)
-#define SR_OVERRUN (1 << 4)
-#define SR_TXRDY (1 << 2)
-#define SR_RXRDY (1 << 0)
-
-#define CR_RES_MR (1 << 4)
-#define CR_RES_RX (2 << 4)
-#define CR_RES_TX (3 << 4)
-#define CR_STRT_BRK (6 << 4)
-#define CR_STOP_BRK (7 << 4)
-#define CR_DIS_TX (1 << 3)
-#define CR_ENA_TX (1 << 2)
-#define CR_DIS_RX (1 << 1)
-#define CR_ENA_RX (1 << 0)
-
-/* ISR bits */
-#define ISR_RXRDYB (1 << 5)
-#define ISR_TXRDYB (1 << 4)
-#define ISR_RXRDYA (1 << 1)
-#define ISR_TXRDYA (1 << 0)
-
-/* IMR bits */
-#define IMR_RXRDY (1 << 1)
-#define IMR_TXRDY (1 << 0)
-
-/* access port register */
-static inline u8 read_sc_port(struct uart_port *p, u8 reg)
-{
- return readb(p->membase + p->line * 0x20 + reg);
-}
-
-static inline void write_sc_port(struct uart_port *p, u8 reg, u8 val)
-{
- writeb(val, p->membase + p->line * 0x20 + reg);
-}
-
-#define READ_SC_PORT(p, r) read_sc_port(p, RD_PORT_##r)
-#define WRITE_SC_PORT(p, r, v) write_sc_port(p, WR_PORT_##r, v)
-
-static void sc26xx_enable_irq(struct uart_port *port, int mask)
-{
- struct uart_sc26xx_port *up;
- int line = port->line;
-
- port -= line;
- up = container_of(port, struct uart_sc26xx_port, port[0]);
-
- up->imr |= mask << (line * 4);
- WRITE_SC(port, IMR, up->imr);
-}
-
-static void sc26xx_disable_irq(struct uart_port *port, int mask)
-{
- struct uart_sc26xx_port *up;
- int line = port->line;
-
- port -= line;
- up = container_of(port, struct uart_sc26xx_port, port[0]);
-
- up->imr &= ~(mask << (line * 4));
- WRITE_SC(port, IMR, up->imr);
-}
-
-static struct tty_struct *receive_chars(struct uart_port *port)
-{
- struct tty_struct *tty = NULL;
- int limit = 10000;
- unsigned char ch;
- char flag;
- u8 status;
-
- if (port->state != NULL) /* Unopened serial console */
- tty = port->state->port.tty;
-
- while (limit-- > 0) {
- status = READ_SC_PORT(port, SR);
- if (!(status & SR_RXRDY))
- break;
- ch = READ_SC_PORT(port, RHR);
-
- flag = TTY_NORMAL;
- port->icount.rx++;
-
- if (unlikely(status & (SR_BREAK | SR_FRAME |
- SR_PARITY | SR_OVERRUN))) {
- if (status & SR_BREAK) {
- status &= ~(SR_PARITY | SR_FRAME);
- port->icount.brk++;
- if (uart_handle_break(port))
- continue;
- } else if (status & SR_PARITY)
- port->icount.parity++;
- else if (status & SR_FRAME)
- port->icount.frame++;
- if (status & SR_OVERRUN)
- port->icount.overrun++;
-
- status &= port->read_status_mask;
- if (status & SR_BREAK)
- flag = TTY_BREAK;
- else if (status & SR_PARITY)
- flag = TTY_PARITY;
- else if (status & SR_FRAME)
- flag = TTY_FRAME;
- }
-
- if (uart_handle_sysrq_char(port, ch))
- continue;
-
- if (status & port->ignore_status_mask)
- continue;
-
- tty_insert_flip_char(tty, ch, flag);
- }
- return tty;
-}
-
-static void transmit_chars(struct uart_port *port)
-{
- struct circ_buf *xmit;
-
- if (!port->state)
- return;
-
- xmit = &port->state->xmit;
- if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
- sc26xx_disable_irq(port, IMR_TXRDY);
- return;
- }
- while (!uart_circ_empty(xmit)) {
- if (!(READ_SC_PORT(port, SR) & SR_TXRDY))
- break;
-
- WRITE_SC_PORT(port, THR, xmit->buf[xmit->tail]);
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- port->icount.tx++;
- }
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(port);
-}
-
-static irqreturn_t sc26xx_interrupt(int irq, void *dev_id)
-{
- struct uart_sc26xx_port *up = dev_id;
- struct tty_struct *tty;
- unsigned long flags;
- u8 isr;
-
- spin_lock_irqsave(&up->port[0].lock, flags);
-
- tty = NULL;
- isr = READ_SC(&up->port[0], ISR);
- if (isr & ISR_TXRDYA)
- transmit_chars(&up->port[0]);
- if (isr & ISR_RXRDYA)
- tty = receive_chars(&up->port[0]);
-
- spin_unlock(&up->port[0].lock);
-
- if (tty)
- tty_flip_buffer_push(tty);
-
- spin_lock(&up->port[1].lock);
-
- tty = NULL;
- if (isr & ISR_TXRDYB)
- transmit_chars(&up->port[1]);
- if (isr & ISR_RXRDYB)
- tty = receive_chars(&up->port[1]);
-
- spin_unlock_irqrestore(&up->port[1].lock, flags);
-
- if (tty)
- tty_flip_buffer_push(tty);
-
- return IRQ_HANDLED;
-}
-
-/* port->lock is not held. */
-static unsigned int sc26xx_tx_empty(struct uart_port *port)
-{
- return (READ_SC_PORT(port, SR) & SR_TXRDY) ? TIOCSER_TEMT : 0;
-}
-
-/* port->lock held by caller. */
-static void sc26xx_set_mctrl(struct uart_port *port, unsigned int mctrl)
-{
- struct uart_sc26xx_port *up;
- int line = port->line;
-
- port -= line;
- up = container_of(port, struct uart_sc26xx_port, port[0]);
-
- if (up->dtr_mask[line]) {
- if (mctrl & TIOCM_DTR)
- WRITE_SC(port, OPR_SET, up->dtr_mask[line]);
- else
- WRITE_SC(port, OPR_CLR, up->dtr_mask[line]);
- }
- if (up->rts_mask[line]) {
- if (mctrl & TIOCM_RTS)
- WRITE_SC(port, OPR_SET, up->rts_mask[line]);
- else
- WRITE_SC(port, OPR_CLR, up->rts_mask[line]);
- }
-}
-
-/* port->lock is held by caller and interrupts are disabled. */
-static unsigned int sc26xx_get_mctrl(struct uart_port *port)
-{
- struct uart_sc26xx_port *up;
- int line = port->line;
- unsigned int mctrl = TIOCM_DSR | TIOCM_CTS | TIOCM_CAR;
- u8 ipr;
-
- port -= line;
- up = container_of(port, struct uart_sc26xx_port, port[0]);
- ipr = READ_SC(port, IPR) ^ 0xff;
-
- if (up->dsr_mask[line]) {
- mctrl &= ~TIOCM_DSR;
- mctrl |= ipr & up->dsr_mask[line] ? TIOCM_DSR : 0;
- }
- if (up->cts_mask[line]) {
- mctrl &= ~TIOCM_CTS;
- mctrl |= ipr & up->cts_mask[line] ? TIOCM_CTS : 0;
- }
- if (up->dcd_mask[line]) {
- mctrl &= ~TIOCM_CAR;
- mctrl |= ipr & up->dcd_mask[line] ? TIOCM_CAR : 0;
- }
- if (up->ri_mask[line]) {
- mctrl &= ~TIOCM_RNG;
- mctrl |= ipr & up->ri_mask[line] ? TIOCM_RNG : 0;
- }
- return mctrl;
-}
-
-/* port->lock held by caller. */
-static void sc26xx_stop_tx(struct uart_port *port)
-{
- return;
-}
-
-/* port->lock held by caller. */
-static void sc26xx_start_tx(struct uart_port *port)
-{
- struct circ_buf *xmit = &port->state->xmit;
-
- while (!uart_circ_empty(xmit)) {
- if (!(READ_SC_PORT(port, SR) & SR_TXRDY)) {
- sc26xx_enable_irq(port, IMR_TXRDY);
- break;
- }
- WRITE_SC_PORT(port, THR, xmit->buf[xmit->tail]);
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- port->icount.tx++;
- }
-}
-
-/* port->lock held by caller. */
-static void sc26xx_stop_rx(struct uart_port *port)
-{
-}
-
-/* port->lock held by caller. */
-static void sc26xx_enable_ms(struct uart_port *port)
-{
-}
-
-/* port->lock is not held. */
-static void sc26xx_break_ctl(struct uart_port *port, int break_state)
-{
- if (break_state == -1)
- WRITE_SC_PORT(port, CR, CR_STRT_BRK);
- else
- WRITE_SC_PORT(port, CR, CR_STOP_BRK);
-}
-
-/* port->lock is not held. */
-static int sc26xx_startup(struct uart_port *port)
-{
- sc26xx_disable_irq(port, IMR_TXRDY | IMR_RXRDY);
- WRITE_SC(port, OPCR, 0);
-
- /* reset tx and rx */
- WRITE_SC_PORT(port, CR, CR_RES_RX);
- WRITE_SC_PORT(port, CR, CR_RES_TX);
-
- /* start rx/tx */
- WRITE_SC_PORT(port, CR, CR_ENA_TX | CR_ENA_RX);
-
- /* enable irqs */
- sc26xx_enable_irq(port, IMR_RXRDY);
- return 0;
-}
-
-/* port->lock is not held. */
-static void sc26xx_shutdown(struct uart_port *port)
-{
- /* disable interrupst */
- sc26xx_disable_irq(port, IMR_TXRDY | IMR_RXRDY);
-
- /* stop tx/rx */
- WRITE_SC_PORT(port, CR, CR_DIS_TX | CR_DIS_RX);
-}
-
-/* port->lock is not held. */
-static void sc26xx_set_termios(struct uart_port *port, struct ktermios *termios,
- struct ktermios *old)
-{
- unsigned int baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
- unsigned int quot = uart_get_divisor(port, baud);
- unsigned int iflag, cflag;
- unsigned long flags;
- u8 mr1, mr2, csr;
-
- spin_lock_irqsave(&port->lock, flags);
-
- while ((READ_SC_PORT(port, SR) & ((1 << 3) | (1 << 2))) != 0xc)
- udelay(2);
-
- WRITE_SC_PORT(port, CR, CR_DIS_TX | CR_DIS_RX);
-
- iflag = termios->c_iflag;
- cflag = termios->c_cflag;
-
- port->read_status_mask = SR_OVERRUN;
- if (iflag & INPCK)
- port->read_status_mask |= SR_PARITY | SR_FRAME;
- if (iflag & (BRKINT | PARMRK))
- port->read_status_mask |= SR_BREAK;
-
- port->ignore_status_mask = 0;
- if (iflag & IGNBRK)
- port->ignore_status_mask |= SR_BREAK;
- if ((cflag & CREAD) == 0)
- port->ignore_status_mask |= SR_BREAK | SR_FRAME |
- SR_PARITY | SR_OVERRUN;
-
- switch (cflag & CSIZE) {
- case CS5:
- mr1 = 0x00;
- break;
- case CS6:
- mr1 = 0x01;
- break;
- case CS7:
- mr1 = 0x02;
- break;
- default:
- case CS8:
- mr1 = 0x03;
- break;
- }
- mr2 = 0x07;
- if (cflag & CSTOPB)
- mr2 = 0x0f;
- if (cflag & PARENB) {
- if (cflag & PARODD)
- mr1 |= (1 << 2);
- } else
- mr1 |= (2 << 3);
-
- switch (baud) {
- case 50:
- csr = 0x00;
- break;
- case 110:
- csr = 0x11;
- break;
- case 134:
- csr = 0x22;
- break;
- case 200:
- csr = 0x33;
- break;
- case 300:
- csr = 0x44;
- break;
- case 600:
- csr = 0x55;
- break;
- case 1200:
- csr = 0x66;
- break;
- case 2400:
- csr = 0x88;
- break;
- case 4800:
- csr = 0x99;
- break;
- default:
- case 9600:
- csr = 0xbb;
- break;
- case 19200:
- csr = 0xcc;
- break;
- }
-
- WRITE_SC_PORT(port, CR, CR_RES_MR);
- WRITE_SC_PORT(port, MRx, mr1);
- WRITE_SC_PORT(port, MRx, mr2);
-
- WRITE_SC(port, ACR, 0x80);
- WRITE_SC_PORT(port, CSR, csr);
-
- /* reset tx and rx */
- WRITE_SC_PORT(port, CR, CR_RES_RX);
- WRITE_SC_PORT(port, CR, CR_RES_TX);
-
- WRITE_SC_PORT(port, CR, CR_ENA_TX | CR_ENA_RX);
- while ((READ_SC_PORT(port, SR) & ((1 << 3) | (1 << 2))) != 0xc)
- udelay(2);
-
- /* XXX */
- uart_update_timeout(port, cflag,
- (port->uartclk / (16 * quot)));
-
- spin_unlock_irqrestore(&port->lock, flags);
-}
-
-static const char *sc26xx_type(struct uart_port *port)
-{
- return "SC26XX";
-}
-
-static void sc26xx_release_port(struct uart_port *port)
-{
-}
-
-static int sc26xx_request_port(struct uart_port *port)
-{
- return 0;
-}
-
-static void sc26xx_config_port(struct uart_port *port, int flags)
-{
-}
-
-static int sc26xx_verify_port(struct uart_port *port, struct serial_struct *ser)
-{
- return -EINVAL;
-}
-
-static struct uart_ops sc26xx_ops = {
- .tx_empty = sc26xx_tx_empty,
- .set_mctrl = sc26xx_set_mctrl,
- .get_mctrl = sc26xx_get_mctrl,
- .stop_tx = sc26xx_stop_tx,
- .start_tx = sc26xx_start_tx,
- .stop_rx = sc26xx_stop_rx,
- .enable_ms = sc26xx_enable_ms,
- .break_ctl = sc26xx_break_ctl,
- .startup = sc26xx_startup,
- .shutdown = sc26xx_shutdown,
- .set_termios = sc26xx_set_termios,
- .type = sc26xx_type,
- .release_port = sc26xx_release_port,
- .request_port = sc26xx_request_port,
- .config_port = sc26xx_config_port,
- .verify_port = sc26xx_verify_port,
-};
-
-static struct uart_port *sc26xx_port;
-
-#ifdef CONFIG_SERIAL_SC26XX_CONSOLE
-static void sc26xx_console_putchar(struct uart_port *port, char c)
-{
- unsigned long flags;
- int limit = 1000000;
-
- spin_lock_irqsave(&port->lock, flags);
-
- while (limit-- > 0) {
- if (READ_SC_PORT(port, SR) & SR_TXRDY) {
- WRITE_SC_PORT(port, THR, c);
- break;
- }
- udelay(2);
- }
-
- spin_unlock_irqrestore(&port->lock, flags);
-}
-
-static void sc26xx_console_write(struct console *con, const char *s, unsigned n)
-{
- struct uart_port *port = sc26xx_port;
- int i;
-
- for (i = 0; i < n; i++) {
- if (*s == '\n')
- sc26xx_console_putchar(port, '\r');
- sc26xx_console_putchar(port, *s++);
- }
-}
-
-static int __init sc26xx_console_setup(struct console *con, char *options)
-{
- struct uart_port *port = sc26xx_port;
- int baud = 9600;
- int bits = 8;
- int parity = 'n';
- int flow = 'n';
-
- if (port->type != PORT_SC26XX)
- return -1;
-
- printk(KERN_INFO "Console: ttySC%d (SC26XX)\n", con->index);
- if (options)
- uart_parse_options(options, &baud, &parity, &bits, &flow);
-
- return uart_set_options(port, con, baud, parity, bits, flow);
-}
-
-static struct uart_driver sc26xx_reg;
-static struct console sc26xx_console = {
- .name = "ttySC",
- .write = sc26xx_console_write,
- .device = uart_console_device,
- .setup = sc26xx_console_setup,
- .flags = CON_PRINTBUFFER,
- .index = -1,
- .data = &sc26xx_reg,
-};
-#define SC26XX_CONSOLE &sc26xx_console
-#else
-#define SC26XX_CONSOLE NULL
-#endif
-
-static struct uart_driver sc26xx_reg = {
- .owner = THIS_MODULE,
- .driver_name = "SC26xx",
- .dev_name = "ttySC",
- .major = SC26XX_MAJOR,
- .minor = SC26XX_MINOR_START,
- .nr = SC26XX_NR,
- .cons = SC26XX_CONSOLE,
-};
-
-static u8 sc26xx_flags2mask(unsigned int flags, unsigned int bitpos)
-{
- unsigned int bit = (flags >> bitpos) & 15;
-
- return bit ? (1 << (bit - 1)) : 0;
-}
-
-static void __devinit sc26xx_init_masks(struct uart_sc26xx_port *up,
- int line, unsigned int data)
-{
- up->dtr_mask[line] = sc26xx_flags2mask(data, 0);
- up->rts_mask[line] = sc26xx_flags2mask(data, 4);
- up->dsr_mask[line] = sc26xx_flags2mask(data, 8);
- up->cts_mask[line] = sc26xx_flags2mask(data, 12);
- up->dcd_mask[line] = sc26xx_flags2mask(data, 16);
- up->ri_mask[line] = sc26xx_flags2mask(data, 20);
-}
-
-static int __devinit sc26xx_probe(struct platform_device *dev)
-{
- struct resource *res;
- struct uart_sc26xx_port *up;
- unsigned int *sc26xx_data = dev->dev.platform_data;
- int err;
-
- res = platform_get_resource(dev, IORESOURCE_MEM, 0);
- if (!res)
- return -ENODEV;
-
- up = kzalloc(sizeof *up, GFP_KERNEL);
- if (unlikely(!up))
- return -ENOMEM;
-
- up->port[0].line = 0;
- up->port[0].ops = &sc26xx_ops;
- up->port[0].type = PORT_SC26XX;
- up->port[0].uartclk = (29491200 / 16); /* arbitrary */
-
- up->port[0].mapbase = res->start;
- up->port[0].membase = ioremap_nocache(up->port[0].mapbase, 0x40);
- up->port[0].iotype = UPIO_MEM;
- up->port[0].irq = platform_get_irq(dev, 0);
-
- up->port[0].dev = &dev->dev;
-
- sc26xx_init_masks(up, 0, sc26xx_data[0]);
-
- sc26xx_port = &up->port[0];
-
- up->port[1].line = 1;
- up->port[1].ops = &sc26xx_ops;
- up->port[1].type = PORT_SC26XX;
- up->port[1].uartclk = (29491200 / 16); /* arbitrary */
-
- up->port[1].mapbase = up->port[0].mapbase;
- up->port[1].membase = up->port[0].membase;
- up->port[1].iotype = UPIO_MEM;
- up->port[1].irq = up->port[0].irq;
-
- up->port[1].dev = &dev->dev;
-
- sc26xx_init_masks(up, 1, sc26xx_data[1]);
-
- err = uart_register_driver(&sc26xx_reg);
- if (err)
- goto out_free_port;
-
- sc26xx_reg.tty_driver->name_base = sc26xx_reg.minor;
-
- err = uart_add_one_port(&sc26xx_reg, &up->port[0]);
- if (err)
- goto out_unregister_driver;
-
- err = uart_add_one_port(&sc26xx_reg, &up->port[1]);
- if (err)
- goto out_remove_port0;
-
- err = request_irq(up->port[0].irq, sc26xx_interrupt, 0, "sc26xx", up);
- if (err)
- goto out_remove_ports;
-
- dev_set_drvdata(&dev->dev, up);
- return 0;
-
-out_remove_ports:
- uart_remove_one_port(&sc26xx_reg, &up->port[1]);
-out_remove_port0:
- uart_remove_one_port(&sc26xx_reg, &up->port[0]);
-
-out_unregister_driver:
- uart_unregister_driver(&sc26xx_reg);
-
-out_free_port:
- kfree(up);
- sc26xx_port = NULL;
- return err;
-}
-
-
-static int __exit sc26xx_driver_remove(struct platform_device *dev)
-{
- struct uart_sc26xx_port *up = dev_get_drvdata(&dev->dev);
-
- free_irq(up->port[0].irq, up);
-
- uart_remove_one_port(&sc26xx_reg, &up->port[0]);
- uart_remove_one_port(&sc26xx_reg, &up->port[1]);
-
- uart_unregister_driver(&sc26xx_reg);
-
- kfree(up);
- sc26xx_port = NULL;
-
- dev_set_drvdata(&dev->dev, NULL);
- return 0;
-}
-
-static struct platform_driver sc26xx_driver = {
- .probe = sc26xx_probe,
- .remove = __devexit_p(sc26xx_driver_remove),
- .driver = {
- .name = "SC26xx",
- .owner = THIS_MODULE,
- },
-};
-
-static int __init sc26xx_init(void)
-{
- return platform_driver_register(&sc26xx_driver);
-}
-
-static void __exit sc26xx_exit(void)
-{
- platform_driver_unregister(&sc26xx_driver);
-}
-
-module_init(sc26xx_init);
-module_exit(sc26xx_exit);
-
-
-MODULE_AUTHOR("Thomas Bogendörfer");
-MODULE_DESCRIPTION("SC681/SC2692 serial driver");
-MODULE_VERSION("1.0");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:SC26xx");
git.samba.org / sfrench / cifs-2.6.git / blobdiff