-/*
- * Serial driver for ADM5120 SoC
- *
- * Derived from drivers/serial/uart00.c
- * Copyright 2001 Altera Corporation
- *
- * Some pieces are derived from the ADMtek 2.4 serial driver.
- * Copyright (C) ADMtek Incorporated, 2003
- * daniell@admtek.com.tw
- * Which again was derived from drivers/char/serial.c
- * Copyright (C) Linus Torvalds et al.
- *
- * Copyright Jeroen Vreeken (pe1rxq@amsat.org), 2005
- */
-
-#include <linux/autoconf.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/ioport.h>
-#include <linux/serial.h>
-#include <linux/serial_core.h>
-#include <linux/tty.h>
-#include <linux/tty_flip.h>
-#include <linux/console.h>
-
-#include <asm/mach-adm5120/adm5120_defs.h>
-#include <asm/mach-adm5120/adm5120_irq.h>
-
-#define ADM5120_UART_REG(base, reg) \
- (*(volatile u32 *)KSEG1ADDR((base)+(reg)))
-
-#define ADM5120_UARTCLK_FREQ 62500000
-#define ADM5120_UART_BAUDDIV(rate) ((unsigned long)(ADM5120_UARTCLK_FREQ/(16*(rate)) - 1))
-
-#define ADM5120_UART_BAUD115200 ADM5120_UART_BAUDDIV(115200)
-
-#define ADM5120_UART_DATA 0x00
-#define ADM5120_UART_RS 0x04
-#define ADM5120_UART_LCR_H 0x08
-#define ADM5120_UART_LCR_M 0x0c
-#define ADM5120_UART_LCR_L 0x10
-#define ADM5120_UART_CR 0x14
-#define ADM5120_UART_FR 0x18
-#define ADM5120_UART_IR 0x1c
-
-#define ADM5120_UART_FE 0x01
-#define ADM5120_UART_PE 0x02
-#define ADM5120_UART_BE 0x04
-#define ADM5120_UART_OE 0x08
-#define ADM5120_UART_ERR 0x0f
-#define ADM5120_UART_FIFO_EN 0x10
-#define ADM5120_UART_EN 0x01
-#define ADM5120_UART_TIE 0x20
-#define ADM5120_UART_RIE 0x50
-#define ADM5120_UART_IE 0x78
-#define ADM5120_UART_CTS 0x01
-#define ADM5120_UART_DSR 0x02
-#define ADM5120_UART_DCD 0x04
-#define ADM5120_UART_TXFF 0x20
-#define ADM5120_UART_TXFE 0x80
-#define ADM5120_UART_RXFE 0x10
-#define ADM5120_UART_BRK 0x01
-#define ADM5120_UART_PEN 0x02
-#define ADM5120_UART_EPS 0x04
-#define ADM5120_UART_STP2 0x08
-#define ADM5120_UART_W5 0x00
-#define ADM5120_UART_W6 0x20
-#define ADM5120_UART_W7 0x40
-#define ADM5120_UART_W8 0x60
-#define ADM5120_UART_MIS 0x01
-#define ADM5120_UART_RIS 0x02
-#define ADM5120_UART_TIS 0x04
-#define ADM5120_UART_RTIS 0x08
-
-static void adm5120ser_stop_tx(struct uart_port *port)
-{
- ADM5120_UART_REG(port->iobase, ADM5120_UART_CR) &= ~ADM5120_UART_TIE;
-}
-
-static void adm5120ser_irq_rx(struct uart_port *port)
-{
- struct tty_struct *tty = port->info->tty;
- unsigned int status, ch, rds, flg, ignored = 0;
-
- status = ADM5120_UART_REG(port->iobase, ADM5120_UART_FR);
- while (!(status & ADM5120_UART_RXFE)) {
- /*
- * We need to read rds before reading the
- * character from the fifo
- */
- rds = ADM5120_UART_REG(port->iobase, ADM5120_UART_RS);
- ch = ADM5120_UART_REG(port->iobase, ADM5120_UART_DATA);
- port->icount.rx++;
-
- if (tty->low_latency)
- tty_flip_buffer_push(tty);
-
- flg = TTY_NORMAL;
-
- /*
- * Note that the error handling code is
- * out of the main execution path
- */
- if (rds & ADM5120_UART_ERR)
- goto handle_error;
- if (uart_handle_sysrq_char(port, ch))
- goto ignore_char;
-
- error_return:
- tty_insert_flip_char(tty, ch, flg);
-
- ignore_char:
- status = ADM5120_UART_REG(port->iobase, ADM5120_UART_FR);
- }
- out:
- tty_flip_buffer_push(tty);
- return;
-
- handle_error:
- ADM5120_UART_REG(port->iobase, ADM5120_UART_RS) = 0xff;
- if (rds & ADM5120_UART_BE) {
- port->icount.brk++;
- if (uart_handle_break(port))
- goto ignore_char;
- } else if (rds & ADM5120_UART_PE)
- port->icount.parity++;
- else if (rds & ADM5120_UART_FE)
- port->icount.frame++;
- if (rds & ADM5120_UART_OE)
- port->icount.overrun++;
-
- if (rds & port->ignore_status_mask) {
- if (++ignored > 100)
- goto out;
- goto ignore_char;
- }
- rds &= port->read_status_mask;
-
- if (rds & ADM5120_UART_BE)
- flg = TTY_BREAK;
- else if (rds & ADM5120_UART_PE)
- flg = TTY_PARITY;
- else if (rds & ADM5120_UART_FE)
- flg = TTY_FRAME;
-
- if (rds & ADM5120_UART_OE) {
- /*
- * CHECK: does overrun affect the current character?
- * ASSUMPTION: it does not.
- */
- tty_insert_flip_char(tty, ch, flg);
- ch = 0;
- flg = TTY_OVERRUN;
- }
-#ifdef CONFIG_MAGIC_SYSRQ
- port->sysrq = 0;
-#endif
- goto error_return;
-}
-
-static void adm5120ser_irq_tx(struct uart_port *port)
-{
- struct circ_buf *xmit = &port->info->xmit;
- int count;
-
- if (port->x_char) {
- ADM5120_UART_REG(port->iobase, ADM5120_UART_DATA) =
- port->x_char;
- port->icount.tx++;
- port->x_char = 0;
- return;
- }
- if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
- adm5120ser_stop_tx(port);
- return;
- }
-
- count = port->fifosize >> 1;
- do {
- ADM5120_UART_REG(port->iobase, ADM5120_UART_DATA) =
- xmit->buf[xmit->tail];
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- port->icount.tx++;
- if (uart_circ_empty(xmit))
- break;
- } while (--count > 0);
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(port);
-
- if (uart_circ_empty(xmit))
- adm5120ser_stop_tx(port);
-}
-
-static void adm5120ser_irq_modem(struct uart_port *port)
-{
- unsigned int status;
-
- status = ADM5120_UART_REG(port->iobase, ADM5120_UART_FR);
-
- if (status & ADM5120_UART_DCD)
- uart_handle_dcd_change(port, status & ADM5120_UART_DCD);
-
- if (status & ADM5120_UART_DSR)
- port->icount.dsr++;
-
- if (status & ADM5120_UART_CTS)
- uart_handle_cts_change(port, status & ADM5120_UART_CTS);
-
- wake_up_interruptible(&port->info->delta_msr_wait);
-}
-
-static irqreturn_t adm5120ser_irq(int irq, void *dev_id)
-{
- struct uart_port *port = dev_id;
- unsigned long ir = ADM5120_UART_REG(port->iobase, ADM5120_UART_IR);
-
- if (ir & (ADM5120_UART_RIS | ADM5120_UART_RTIS))
- adm5120ser_irq_rx(port);
- if (ir & ADM5120_UART_TIS)
- adm5120ser_irq_tx(port);
- if (ir & ADM5120_UART_MIS) {
- adm5120ser_irq_modem(port);
- ADM5120_UART_REG(port->iobase, ADM5120_UART_IR) = 0xff;
- }
-
- return IRQ_HANDLED;
-}
-
-static unsigned int adm5120ser_tx_empty(struct uart_port *port)
-{
- unsigned int fr = ADM5120_UART_REG(port->iobase, ADM5120_UART_FR);
- return (fr & ADM5120_UART_TXFE) ? TIOCSER_TEMT : 0;
-}
-
-static void adm5120ser_set_mctrl(struct uart_port *port, unsigned int mctrl)
-{
-}
-
-static unsigned int adm5120ser_get_mctrl(struct uart_port *port)
-{
- unsigned int result = 0;
- unsigned int fr = ADM5120_UART_REG(port->iobase, ADM5120_UART_FR);
-
- if (fr & ADM5120_UART_CTS)
- result |= TIOCM_CTS;
- if (fr & ADM5120_UART_DSR)
- result |= TIOCM_DSR;
- if (fr & ADM5120_UART_DCD)
- result |= TIOCM_CAR;
- return result;
-}
-
-static void adm5120ser_start_tx(struct uart_port *port)
-{
- ADM5120_UART_REG(port->iobase, ADM5120_UART_CR) |= ADM5120_UART_TIE;
-}
-
-static void adm5120ser_stop_rx(struct uart_port *port)
-{
- ADM5120_UART_REG(port->iobase, ADM5120_UART_CR) &= ~ADM5120_UART_RIE;
-}
-
-static void adm5120ser_enable_ms(struct uart_port *port)
-{
-}
-
-static void adm5120ser_break_ctl(struct uart_port *port, int break_state)
-{
- unsigned long flags;
- unsigned long lcrh;
-
- spin_lock_irqsave(&port->lock, flags);
- lcrh = ADM5120_UART_REG(port->iobase, ADM5120_UART_LCR_H);
- if (break_state == -1)
- lcrh |= ADM5120_UART_BRK;
- else
- lcrh &= ~ADM5120_UART_BRK;
- ADM5120_UART_REG(port->iobase, ADM5120_UART_LCR_H) = lcrh;
- spin_unlock_irqrestore(&port->lock, flags);
-}
-
-static int adm5120ser_startup(struct uart_port *port)
-{
- int ret;
-
- ret = request_irq(port->irq, adm5120ser_irq, 0, "ADM5120 UART", port);
- if (ret) {
- printk(KERN_ERR "Couldn't get irq %d\n", port->irq);
- return ret;
- }
- ADM5120_UART_REG(port->iobase, ADM5120_UART_LCR_H) |=
- ADM5120_UART_FIFO_EN;
- ADM5120_UART_REG(port->iobase, ADM5120_UART_CR) |=
- ADM5120_UART_EN | ADM5120_UART_IE;
- return 0;
-}
-
-static void adm5120ser_shutdown(struct uart_port *port)
-{
- ADM5120_UART_REG(port->iobase, ADM5120_UART_CR) &= ~ADM5120_UART_IE;
- free_irq(port->irq, port);
-}
-
-static void adm5120ser_set_termios(struct uart_port *port,
- struct ktermios *termios, struct ktermios *old)
-{
- unsigned int baud, quot, lcrh;
- unsigned long flags;
-
- termios->c_cflag |= CREAD;
-
- baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
- quot = uart_get_divisor(port, baud);
-
- lcrh = ADM5120_UART_FIFO_EN;
- switch (termios->c_cflag & CSIZE) {
- case CS5:
- lcrh |= ADM5120_UART_W5;
- break;
- case CS6:
- lcrh |= ADM5120_UART_W6;
- break;
- case CS7:
- lcrh |= ADM5120_UART_W7;
- break;
- default:
- lcrh |= ADM5120_UART_W8;
- break;
- }
- if (termios->c_cflag & CSTOPB)
- lcrh |= ADM5120_UART_STP2;
- if (termios->c_cflag & PARENB) {
- lcrh |= ADM5120_UART_PEN;
- if (!(termios->c_cflag & PARODD))
- lcrh |= ADM5120_UART_EPS;
- }
-
- spin_lock_irqsave(port->lock, flags);
-
- ADM5120_UART_REG(port->iobase, ADM5120_UART_LCR_H) = lcrh;
-
- /*
- * Update the per-port timeout.
- */
- uart_update_timeout(port, termios->c_cflag, baud);
-
- port->read_status_mask = ADM5120_UART_OE;
- if (termios->c_iflag & INPCK)
- port->read_status_mask |= ADM5120_UART_FE | ADM5120_UART_PE;
- if (termios->c_iflag & (BRKINT | PARMRK))
- port->read_status_mask |= ADM5120_UART_BE;
-
- /*
- * Characters to ignore
- */
- port->ignore_status_mask = 0;
- if (termios->c_iflag & IGNPAR)
- port->ignore_status_mask |= ADM5120_UART_FE | ADM5120_UART_PE;
- if (termios->c_iflag & IGNBRK) {
- port->ignore_status_mask |= ADM5120_UART_BE;
- /*
- * If we're ignoring parity and break indicators,
- * ignore overruns to (for real raw support).
- */
- if (termios->c_iflag & IGNPAR)
- port->ignore_status_mask |= ADM5120_UART_OE;
- }
-
- quot = ADM5120_UART_BAUD115200;
- ADM5120_UART_REG(port->iobase, ADM5120_UART_LCR_L) = quot & 0xff;
- ADM5120_UART_REG(port->iobase, ADM5120_UART_LCR_M) = quot >> 8;
-
- spin_unlock_irqrestore(&port->lock, flags);
-}
-
-static const char *adm5120ser_type(struct uart_port *port)
-{
- return port->type == PORT_ADM5120 ? "ADM5120" : NULL;
-}
-
-static void adm5120ser_config_port(struct uart_port *port, int flags)
-{
- if (flags & UART_CONFIG_TYPE)
- port->type = PORT_ADM5120;
-}
-
-static void adm5120ser_release_port(struct uart_port *port)
-{
- release_mem_region(port->iobase, ADM5120_UART_SIZE);
-}
-
-static int adm5120ser_request_port(struct uart_port *port)
-{
- return request_mem_region(port->iobase, ADM5120_UART_SIZE,
- "adm5120-uart") != NULL ? 0 : -EBUSY;
-}
-
-static struct uart_ops adm5120ser_ops = {
- .tx_empty = adm5120ser_tx_empty,
- .set_mctrl = adm5120ser_set_mctrl,
- .get_mctrl = adm5120ser_get_mctrl,
- .stop_tx = adm5120ser_stop_tx,
- .start_tx = adm5120ser_start_tx,
- .stop_rx = adm5120ser_stop_rx,
- .enable_ms = adm5120ser_enable_ms,
- .break_ctl = adm5120ser_break_ctl,
- .startup = adm5120ser_startup,
- .shutdown = adm5120ser_shutdown,
- .set_termios = adm5120ser_set_termios,
- .type = adm5120ser_type,
- .config_port = adm5120ser_config_port,
- .release_port = adm5120ser_release_port,
- .request_port = adm5120ser_request_port,
-};
-
-static void adm5120console_put(const char c)
-{
- while ((ADM5120_UART_REG(ADM5120_UART0_BASE, ADM5120_UART_FR) &
- ADM5120_UART_TXFF) != 0);
- ADM5120_UART_REG(ADM5120_UART0_BASE, ADM5120_UART_DATA) = c;
-}
-
-static void adm5120console_write(struct console *con, const char *s,
- unsigned int count)
-{
- while (count--) {
- if (*s == '\n')
- adm5120console_put('\r');
- adm5120console_put(*s);
- s++;
- }
-}
-
-static int adm5120console_setup(struct console *con, char *options)
-{
- /* Set to 115200 baud, 8N1 and enable FIFO */
- ADM5120_UART_REG(ADM5120_UART0_BASE, ADM5120_UART_LCR_L) =
- ADM5120_UART_BAUD115200 & 0xff;
- ADM5120_UART_REG(ADM5120_UART0_BASE, ADM5120_UART_LCR_M) =
- ADM5120_UART_BAUD115200 >> 8;
- ADM5120_UART_REG(ADM5120_UART0_BASE, ADM5120_UART_LCR_H) =
- ADM5120_UART_W8 | ADM5120_UART_FIFO_EN;
- /* Enable port */
- ADM5120_UART_REG(ADM5120_UART0_BASE, ADM5120_UART_CR) =
- ADM5120_UART_EN;
-
- return 0;
-}
-
-static struct uart_driver adm5120ser_reg;
-
-static struct console adm5120_serconsole = {
- .name = "ttyS",
- .write = adm5120console_write,
- .device = uart_console_device,
- .setup = adm5120console_setup,
- .flags = CON_PRINTBUFFER,
- .cflag = B115200 | CS8 | CREAD,
- .index = 0,
- .data = &adm5120ser_reg,
-};
-
-static int __init adm5120console_init(void)
-{
- register_console(&adm5120_serconsole);
- return 0;
-}
-
-console_initcall(adm5120console_init);
-
-
-static struct uart_port adm5120ser_ports[] = {
- {
- .iobase = ADM5120_UART0_BASE,
- .irq = ADM5120_IRQ_UART0,
- .uartclk = ADM5120_UARTCLK_FREQ,
- .fifosize = 16,
- .ops = &adm5120ser_ops,
- .line = 0,
- .flags = ASYNC_BOOT_AUTOCONF,
- },
-#if (CONFIG_ADM5120_NR_UARTS > 1)
- {
- .iobase = ADM5120_UART1_BASE,
- .irq = ADM5120_IRQ_UART1,
- .uartclk = ADM5120_UARTCLK_FREQ,
- .fifosize = 16,
- .ops = &adm5120ser_ops,
- .line = 1,
- .flags = ASYNC_BOOT_AUTOCONF,
- },
-#endif
-};
-
-static struct uart_driver adm5120ser_reg = {
- .owner = THIS_MODULE,
- .driver_name = "ttyS",
- .dev_name = "ttyS",
- .major = TTY_MAJOR,
- .minor = 64,
- .nr = CONFIG_ADM5120_NR_UARTS,
- .cons = &adm5120_serconsole,
-};
-
-static int __init adm5120ser_init(void)
-{
- int ret, i;
-
- ret = uart_register_driver(&adm5120ser_reg);
- if (!ret) {
- for (i = 0; i < CONFIG_ADM5120_NR_UARTS; i++)
- uart_add_one_port(&adm5120ser_reg, &adm5120ser_ports[i]);
- }
-
- return ret;
-}
-
-__initcall(adm5120ser_init);
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