diff options
Diffstat (limited to 'drivers/serial/at91_serial.c')
| -rw-r--r-- | drivers/serial/at91_serial.c | 980 |
1 files changed, 0 insertions, 980 deletions
diff --git a/drivers/serial/at91_serial.c b/drivers/serial/at91_serial.c deleted file mode 100644 index 54c6b2a..0000000 --- a/drivers/serial/at91_serial.c +++ /dev/null @@ -1,980 +0,0 @@ -/* - * linux/drivers/char/at91_serial.c - * - * Driver for Atmel AT91RM9200 Serial ports - * Copyright (C) 2003 Rick Bronson - * - * Based on drivers/char/serial_sa1100.c, by Deep Blue Solutions Ltd. - * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * - */ -#include <linux/module.h> -#include <linux/tty.h> -#include <linux/ioport.h> -#include <linux/slab.h> -#include <linux/init.h> -#include <linux/serial.h> -#include <linux/clk.h> -#include <linux/console.h> -#include <linux/sysrq.h> -#include <linux/tty_flip.h> -#include <linux/platform_device.h> - -#include <asm/io.h> - -#include <asm/arch/at91rm9200_usart.h> -#include <asm/arch/at91rm9200_pdc.h> -#include <asm/mach/serial_at91.h> -#include <asm/arch/board.h> -#include <asm/arch/system.h> -#include <asm/arch/gpio.h> - -#if defined(CONFIG_SERIAL_AT91_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) -#define SUPPORT_SYSRQ -#endif - -#include <linux/serial_core.h> - -#ifdef CONFIG_SERIAL_AT91_TTYAT - -/* Use device name ttyAT, major 204 and minor 154-169. This is necessary if we - * should coexist with the 8250 driver, such as if we have an external 16C550 - * UART. */ -#define SERIAL_AT91_MAJOR 204 -#define MINOR_START 154 -#define AT91_DEVICENAME "ttyAT" - -#else - -/* Use device name ttyS, major 4, minor 64-68. This is the usual serial port - * name, but it is legally reserved for the 8250 driver. */ -#define SERIAL_AT91_MAJOR TTY_MAJOR -#define MINOR_START 64 -#define AT91_DEVICENAME "ttyS" - -#endif - -#define AT91_ISR_PASS_LIMIT 256 - -#define UART_PUT_CR(port,v) writel(v, (port)->membase + AT91_US_CR) -#define UART_GET_MR(port) readl((port)->membase + AT91_US_MR) -#define UART_PUT_MR(port,v) writel(v, (port)->membase + AT91_US_MR) -#define UART_PUT_IER(port,v) writel(v, (port)->membase + AT91_US_IER) -#define UART_PUT_IDR(port,v) writel(v, (port)->membase + AT91_US_IDR) -#define UART_GET_IMR(port) readl((port)->membase + AT91_US_IMR) -#define UART_GET_CSR(port) readl((port)->membase + AT91_US_CSR) -#define UART_GET_CHAR(port) readl((port)->membase + AT91_US_RHR) -#define UART_PUT_CHAR(port,v) writel(v, (port)->membase + AT91_US_THR) -#define UART_GET_BRGR(port) readl((port)->membase + AT91_US_BRGR) -#define UART_PUT_BRGR(port,v) writel(v, (port)->membase + AT91_US_BRGR) -#define UART_PUT_RTOR(port,v) writel(v, (port)->membase + AT91_US_RTOR) - -// #define UART_GET_CR(port) readl((port)->membase + AT91_US_CR) // is write-only - - /* PDC registers */ -#define UART_PUT_PTCR(port,v) writel(v, (port)->membase + AT91_PDC_PTCR) -#define UART_GET_PTSR(port) readl((port)->membase + AT91_PDC_PTSR) - -#define UART_PUT_RPR(port,v) writel(v, (port)->membase + AT91_PDC_RPR) -#define UART_GET_RPR(port) readl((port)->membase + AT91_PDC_RPR) -#define UART_PUT_RCR(port,v) writel(v, (port)->membase + AT91_PDC_RCR) -#define UART_PUT_RNPR(port,v) writel(v, (port)->membase + AT91_PDC_RNPR) -#define UART_PUT_RNCR(port,v) writel(v, (port)->membase + AT91_PDC_RNCR) - -#define UART_PUT_TPR(port,v) writel(v, (port)->membase + AT91_PDC_TPR) -#define UART_PUT_TCR(port,v) writel(v, (port)->membase + AT91_PDC_TCR) -//#define UART_PUT_TNPR(port,v) writel(v, (port)->membase + AT91_PDC_TNPR) -//#define UART_PUT_TNCR(port,v) writel(v, (port)->membase + AT91_PDC_TNCR) - -static int (*at91_open)(struct uart_port *); -static void (*at91_close)(struct uart_port *); - -/* - * We wrap our port structure around the generic uart_port. - */ -struct at91_uart_port { - struct uart_port uart; /* uart */ - struct clk *clk; /* uart clock */ - unsigned short suspended; /* is port suspended? */ -}; - -static struct at91_uart_port at91_ports[AT91_NR_UART]; - -#ifdef SUPPORT_SYSRQ -static struct console at91_console; -#endif - -/* - * Return TIOCSER_TEMT when transmitter FIFO and Shift register is empty. - */ -static u_int at91_tx_empty(struct uart_port *port) -{ - return (UART_GET_CSR(port) & AT91_US_TXEMPTY) ? TIOCSER_TEMT : 0; -} - -/* - * Set state of the modem control output lines - */ -static void at91_set_mctrl(struct uart_port *port, u_int mctrl) -{ - unsigned int control = 0; - unsigned int mode; - - if (arch_identify() == ARCH_ID_AT91RM9200) { - /* - * AT91RM9200 Errata #39: RTS0 is not internally connected to PA21. - * We need to drive the pin manually. - */ - if (port->mapbase == AT91_BASE_US0) { - if (mctrl & TIOCM_RTS) - at91_set_gpio_value(AT91_PIN_PA21, 0); - else - at91_set_gpio_value(AT91_PIN_PA21, 1); - } - } - - if (mctrl & TIOCM_RTS) - control |= AT91_US_RTSEN; - else - control |= AT91_US_RTSDIS; - - if (mctrl & TIOCM_DTR) - control |= AT91_US_DTREN; - else - control |= AT91_US_DTRDIS; - - UART_PUT_CR(port, control); - - /* Local loopback mode? */ - mode = UART_GET_MR(port) & ~AT91_US_CHMODE; - if (mctrl & TIOCM_LOOP) - mode |= AT91_US_CHMODE_LOC_LOOP; - else - mode |= AT91_US_CHMODE_NORMAL; - UART_PUT_MR(port, mode); -} - -/* - * Get state of the modem control input lines - */ -static u_int at91_get_mctrl(struct uart_port *port) -{ - unsigned int status, ret = 0; - - status = UART_GET_CSR(port); - - /* - * The control signals are active low. - */ - if (!(status & AT91_US_DCD)) - ret |= TIOCM_CD; - if (!(status & AT91_US_CTS)) - ret |= TIOCM_CTS; - if (!(status & AT91_US_DSR)) - ret |= TIOCM_DSR; - if (!(status & AT91_US_RI)) - ret |= TIOCM_RI; - - return ret; -} - -/* - * Stop transmitting. - */ -static void at91_stop_tx(struct uart_port *port) -{ - struct at91_uart_port *at91_port = (struct at91_uart_port *) port; - - UART_PUT_IDR(port, AT91_US_TXRDY); -} - -/* - * Start transmitting. - */ -static void at91_start_tx(struct uart_port *port) -{ - struct at91_uart_port *at91_port = (struct at91_uart_port *) port; - - UART_PUT_IER(port, AT91_US_TXRDY); -} - -/* - * Stop receiving - port is in process of being closed. - */ -static void at91_stop_rx(struct uart_port *port) -{ - struct at91_uart_port *at91_port = (struct at91_uart_port *) port; - - UART_PUT_IDR(port, AT91_US_RXRDY); -} - -/* - * Enable modem status interrupts - */ -static void at91_enable_ms(struct uart_port *port) -{ - UART_PUT_IER(port, AT91_US_RIIC | AT91_US_DSRIC | AT91_US_DCDIC | AT91_US_CTSIC); -} - -/* - * Control the transmission of a break signal - */ -static void at91_break_ctl(struct uart_port *port, int break_state) -{ - if (break_state != 0) - UART_PUT_CR(port, AT91_US_STTBRK); /* start break */ - else - UART_PUT_CR(port, AT91_US_STPBRK); /* stop break */ -} - -/* - * Characters received (called from interrupt handler) - */ -static void at91_rx_chars(struct uart_port *port, struct pt_regs *regs) -{ - struct tty_struct *tty = port->info->tty; - unsigned int status, ch, flg; - - status = UART_GET_CSR(port); - while (status & AT91_US_RXRDY) { - ch = UART_GET_CHAR(port); - - port->icount.rx++; - - flg = TTY_NORMAL; - - /* - * note that the error handling code is - * out of the main execution path - */ - if (unlikely(status & (AT91_US_PARE | AT91_US_FRAME | AT91_US_OVRE | AT91_US_RXBRK))) { - UART_PUT_CR(port, AT91_US_RSTSTA); /* clear error */ - if (status & AT91_US_RXBRK) { - status &= ~(AT91_US_PARE | AT91_US_FRAME); /* ignore side-effect */ - port->icount.brk++; - if (uart_handle_break(port)) - goto ignore_char; - } - if (status & AT91_US_PARE) - port->icount.parity++; - if (status & AT91_US_FRAME) - port->icount.frame++; - if (status & AT91_US_OVRE) - port->icount.overrun++; - - status &= port->read_status_mask; - - if (status & AT91_US_RXBRK) - flg = TTY_BREAK; - else if (status & AT91_US_PARE) - flg = TTY_PARITY; - else if (status & AT91_US_FRAME) - flg = TTY_FRAME; - } - - if (uart_handle_sysrq_char(port, ch, regs)) - goto ignore_char; - - uart_insert_char(port, status, AT91_US_OVRE, ch, flg); - - ignore_char: - status = UART_GET_CSR(port); - } - - tty_flip_buffer_push(tty); -} - -/* - * Transmit characters (called from interrupt handler) - */ -static void at91_tx_chars(struct uart_port *port) -{ - struct circ_buf *xmit = &port->info->xmit; - - if (port->x_char) { - UART_PUT_CHAR(port, port->x_char); - port->icount.tx++; - port->x_char = 0; - return; - } - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { - at91_stop_tx(port); - return; - } - - while (UART_GET_CSR(port) & AT91_US_TXRDY) { - UART_PUT_CHAR(port, xmit->buf[xmit->tail]); - xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); - port->icount.tx++; - if (uart_circ_empty(xmit)) - break; - } - - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) - uart_write_wakeup(port); - - if (uart_circ_empty(xmit)) - at91_stop_tx(port); -} - -/* - * Interrupt handler - */ -static irqreturn_t at91_interrupt(int irq, void *dev_id, struct pt_regs *regs) -{ - struct uart_port *port = dev_id; - struct at91_uart_port *at91_port = (struct at91_uart_port *) port; - unsigned int status, pending, pass_counter = 0; - - status = UART_GET_CSR(port); - pending = status & UART_GET_IMR(port); - while (pending) { - /* Interrupt receive */ - if (pending & AT91_US_RXRDY) - at91_rx_chars(port, regs); - - // TODO: All reads to CSR will clear these interrupts! - if (pending & AT91_US_RIIC) port->icount.rng++; - if (pending & AT91_US_DSRIC) port->icount.dsr++; - if (pending & AT91_US_DCDIC) - uart_handle_dcd_change(port, !(status & AT91_US_DCD)); - if (pending & AT91_US_CTSIC) - uart_handle_cts_change(port, !(status & AT91_US_CTS)); - if (pending & (AT91_US_RIIC | AT91_US_DSRIC | AT91_US_DCDIC | AT91_US_CTSIC)) - wake_up_interruptible(&port->info->delta_msr_wait); - - /* Interrupt transmit */ - if (pending & AT91_US_TXRDY) - at91_tx_chars(port); - - if (pass_counter++ > AT91_ISR_PASS_LIMIT) - break; - - status = UART_GET_CSR(port); - pending = status & UART_GET_IMR(port); - } - return IRQ_HANDLED; -} - -/* - * Perform initialization and enable port for reception - */ -static int at91_startup(struct uart_port *port) -{ - struct at91_uart_port *at91_port = (struct at91_uart_port *) port; - int retval; - - /* - * Ensure that no interrupts are enabled otherwise when - * request_irq() is called we could get stuck trying to - * handle an unexpected interrupt - */ - UART_PUT_IDR(port, -1); - - /* - * Allocate the IRQ - */ - retval = request_irq(port->irq, at91_interrupt, IRQF_SHARED, "at91_serial", port); - if (retval) { - printk("at91_serial: at91_startup - Can't get irq\n"); - return retval; - } - - /* - * If there is a specific "open" function (to register - * control line interrupts) - */ - if (at91_open) { - retval = at91_open(port); - if (retval) { - free_irq(port->irq, port); - return retval; - } - } - - /* - * Finally, enable the serial port - */ - UART_PUT_CR(port, AT91_US_RSTSTA | AT91_US_RSTRX); - UART_PUT_CR(port, AT91_US_TXEN | AT91_US_RXEN); /* enable xmit & rcvr */ - - UART_PUT_IER(port, AT91_US_RXRDY); /* enable receive only */ - - return 0; -} - -/* - * Disable the port - */ -static void at91_shutdown(struct uart_port *port) -{ - struct at91_uart_port *at91_port = (struct at91_uart_port *) port; - - /* - * Disable all interrupts, port and break condition. - */ - UART_PUT_CR(port, AT91_US_RSTSTA); - UART_PUT_IDR(port, -1); - - /* - * Free the interrupt - */ - free_irq(port->irq, port); - - /* - * If there is a specific "close" function (to unregister - * control line interrupts) - */ - if (at91_close) - at91_close(port); -} - -/* - * Power / Clock management. - */ -static void at91_serial_pm(struct uart_port *port, unsigned int state, unsigned int oldstate) -{ - struct at91_uart_port *at91_port = (struct at91_uart_port *) port; - - switch (state) { - case 0: - /* - * Enable the peripheral clock for this serial port. - * This is called on uart_open() or a resume event. - */ - clk_enable(at91_port->clk); - break; - case 3: - /* - * Disable the peripheral clock for this serial port. - * This is called on uart_close() or a suspend event. - */ - clk_disable(at91_port->clk); - break; - default: - printk(KERN_ERR "at91_serial: unknown pm %d\n", state); - } -} - -/* - * Change the port parameters - */ -static void at91_set_termios(struct uart_port *port, struct termios * termios, struct termios * old) -{ - unsigned long flags; - unsigned int mode, imr, quot, baud; - - baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); - quot = uart_get_divisor(port, baud); - - /* Get current mode register */ - mode = UART_GET_MR(port) & ~(AT91_US_CHRL | AT91_US_NBSTOP | AT91_US_PAR); - - /* byte size */ - switch (termios->c_cflag & CSIZE) { - case CS5: - mode |= AT91_US_CHRL_5; - break; - case CS6: - mode |= AT91_US_CHRL_6; - break; - case CS7: - mode |= AT91_US_CHRL_7; - break; - default: - mode |= AT91_US_CHRL_8; - break; - } - - /* stop bits */ - if (termios->c_cflag & CSTOPB) - mode |= AT91_US_NBSTOP_2; - - /* parity */ - if (termios->c_cflag & PARENB) { - if (termios->c_cflag & CMSPAR) { /* Mark or Space parity */ - if (termios->c_cflag & PARODD) - mode |= AT91_US_PAR_MARK; - else - mode |= AT91_US_PAR_SPACE; - } - else if (termios->c_cflag & PARODD) - mode |= AT91_US_PAR_ODD; - else - mode |= AT91_US_PAR_EVEN; - } - else - mode |= AT91_US_PAR_NONE; - - spin_lock_irqsave(&port->lock, flags); - - port->read_status_mask = AT91_US_OVRE; - if (termios->c_iflag & INPCK) - port->read_status_mask |= (AT91_US_FRAME | AT91_US_PARE); - if (termios->c_iflag & (BRKINT | PARMRK)) - port->read_status_mask |= AT91_US_RXBRK; - - /* - * Characters to ignore - */ - port->ignore_status_mask = 0; - if (termios->c_iflag & IGNPAR) - port->ignore_status_mask |= (AT91_US_FRAME | AT91_US_PARE); - if (termios->c_iflag & IGNBRK) { - port->ignore_status_mask |= AT91_US_RXBRK; - /* - * If we're ignoring parity and break indicators, - * ignore overruns too (for real raw support). - */ - if (termios->c_iflag & IGNPAR) - port->ignore_status_mask |= AT91_US_OVRE; - } - - // TODO: Ignore all characters if CREAD is set. - - /* update the per-port timeout */ - uart_update_timeout(port, termios->c_cflag, baud); - - /* disable interrupts and drain transmitter */ - imr = UART_GET_IMR(port); /* get interrupt mask */ - UART_PUT_IDR(port, -1); /* disable all interrupts */ - while (!(UART_GET_CSR(port) & AT91_US_TXEMPTY)) { barrier(); } - - /* disable receiver and transmitter */ - UART_PUT_CR(port, AT91_US_TXDIS | AT91_US_RXDIS); - - /* set the parity, stop bits and data size */ - UART_PUT_MR(port, mode); - - /* set the baud rate */ - UART_PUT_BRGR(port, quot); - UART_PUT_CR(port, AT91_US_RSTSTA | AT91_US_RSTRX); - UART_PUT_CR(port, AT91_US_TXEN | AT91_US_RXEN); - - /* restore interrupts */ - UART_PUT_IER(port, imr); - - /* CTS flow-control and modem-status interrupts */ - if (UART_ENABLE_MS(port, termios->c_cflag)) - port->ops->enable_ms(port); - - spin_unlock_irqrestore(&port->lock, flags); -} - -/* - * Return string describing the specified port - */ -static const char *at91_type(struct uart_port *port) -{ - return (port->type == PORT_AT91) ? "AT91_SERIAL" : NULL; -} - -/* - * Release the memory region(s) being used by 'port'. - */ -static void at91_release_port(struct uart_port *port) -{ - struct platform_device *pdev = to_platform_device(port->dev); - int size = pdev->resource[0].end - pdev->resource[0].start + 1; - - release_mem_region(port->mapbase, size); - - if (port->flags & UPF_IOREMAP) { - iounmap(port->membase); - port->membase = NULL; - } -} - -/* - * Request the memory region(s) being used by 'port'. - */ -static int at91_request_port(struct uart_port *port) -{ - struct platform_device *pdev = to_platform_device(port->dev); - int size = pdev->resource[0].end - pdev->resource[0].start + 1; - - if (!request_mem_region(port->mapbase, size, "at91_serial")) - return -EBUSY; - - if (port->flags & UPF_IOREMAP) { - port->membase = ioremap(port->mapbase, size); - if (port->membase == NULL) { - release_mem_region(port->mapbase, size); - return -ENOMEM; - } - } - - return 0; -} - -/* - * Configure/autoconfigure the port. - */ -static void at91_config_port(struct uart_port *port, int flags) -{ - if (flags & UART_CONFIG_TYPE) { - port->type = PORT_AT91; - at91_request_port(port); - } -} - -/* - * Verify the new serial_struct (for TIOCSSERIAL). - */ -static int at91_verify_port(struct uart_port *port, struct serial_struct *ser) -{ - int ret = 0; - if (ser->type != PORT_UNKNOWN && ser->type != PORT_AT91) - ret = -EINVAL; - if (port->irq != ser->irq) - ret = -EINVAL; - if (ser->io_type != SERIAL_IO_MEM) - ret = -EINVAL; - if (port->uartclk / 16 != ser->baud_base) - ret = -EINVAL; - if ((void *)port->mapbase != ser->iomem_base) - ret = -EINVAL; - if (port->iobase != ser->port) - ret = -EINVAL; - if (ser->hub6 != 0) - ret = -EINVAL; - return ret; -} - -static struct uart_ops at91_pops = { - .tx_empty = at91_tx_empty, - .set_mctrl = at91_set_mctrl, - .get_mctrl = at91_get_mctrl, - .stop_tx = at91_stop_tx, - .start_tx = at91_start_tx, - .stop_rx = at91_stop_rx, - .enable_ms = at91_enable_ms, - .break_ctl = at91_break_ctl, - .startup = at91_startup, - .shutdown = at91_shutdown, - .set_termios = at91_set_termios, - .type = at91_type, - .release_port = at91_release_port, - .request_port = at91_request_port, - .config_port = at91_config_port, - .verify_port = at91_verify_port, - .pm = at91_serial_pm, -}; - -/* - * Configure the port from the platform device resource info. - */ -static void __devinit at91_init_port(struct at91_uart_port *at91_port, struct platform_device *pdev) -{ - struct uart_port *port = &at91_port->uart; - struct at91_uart_data *data = pdev->dev.platform_data; - - port->iotype = UPIO_MEM; - port->flags = UPF_BOOT_AUTOCONF; - port->ops = &at91_pops; - port->fifosize = 1; - port->line = pdev->id; - port->dev = &pdev->dev; - - port->mapbase = pdev->resource[0].start; - port->irq = pdev->resource[1].start; - - if (port->mapbase == AT91_VA_BASE_SYS + AT91_DBGU) /* Part of system perpherals - already mapped */ - port->membase = (void __iomem *) port->mapbase; - else { - port->flags |= UPF_IOREMAP; - port->membase = NULL; - } - - if (!at91_port->clk) { /* for console, the clock could already be configured */ - at91_port->clk = clk_get(&pdev->dev, "usart"); - clk_enable(at91_port->clk); - port->uartclk = clk_get_rate(at91_port->clk); - } -} - -/* - * Register board-specific modem-control line handlers. - */ -void __init at91_register_uart_fns(struct at91_port_fns *fns) -{ - if (fns->enable_ms) - at91_pops.enable_ms = fns->enable_ms; - if (fns->get_mctrl) - at91_pops.get_mctrl = fns->get_mctrl; - if (fns->set_mctrl) - at91_pops.set_mctrl = fns->set_mctrl; - at91_open = fns->open; - at91_close = fns->close; - at91_pops.pm = fns->pm; - at91_pops.set_wake = fns->set_wake; -} - - -#ifdef CONFIG_SERIAL_AT91_CONSOLE -static void at91_console_putchar(struct uart_port *port, int ch) -{ - while (!(UART_GET_CSR(port) & AT91_US_TXRDY)) - barrier(); - UART_PUT_CHAR(port, ch); -} - -/* - * Interrupts are disabled on entering - */ -static void at91_console_write(struct console *co, const char *s, u_int count) -{ - struct uart_port *port = &at91_ports[co->index].uart; - unsigned int status, imr; - - /* - * First, save IMR and then disable interrupts - */ - imr = UART_GET_IMR(port); /* get interrupt mask */ - UART_PUT_IDR(port, AT91_US_RXRDY | AT91_US_TXRDY); - - uart_console_write(port, s, count, at91_console_putchar); - - /* - * Finally, wait for transmitter to become empty - * and restore IMR - */ - do { - status = UART_GET_CSR(port); - } while (!(status & AT91_US_TXRDY)); - UART_PUT_IER(port, imr); /* set interrupts back the way they were */ -} - -/* - * If the port was already initialised (eg, by a boot loader), try to determine - * the current setup. - */ -static void __init at91_console_get_options(struct uart_port *port, int *baud, int *parity, int *bits) -{ - unsigned int mr, quot; - -// TODO: CR is a write-only register -// unsigned int cr; -// -// cr = UART_GET_CR(port) & (AT91_US_RXEN | AT91_US_TXEN); -// if (cr == (AT91_US_RXEN | AT91_US_TXEN)) { -// /* ok, the port was enabled */ -// } - - mr = UART_GET_MR(port) & AT91_US_CHRL; - if (mr == AT91_US_CHRL_8) - *bits = 8; - else - *bits = 7; - - mr = UART_GET_MR(port) & AT91_US_PAR; - if (mr == AT91_US_PAR_EVEN) - *parity = 'e'; - else if (mr == AT91_US_PAR_ODD) - *parity = 'o'; - - quot = UART_GET_BRGR(port); - *baud = port->uartclk / (16 * (quot)); -} - -static int __init at91_console_setup(struct console *co, char *options) -{ - struct uart_port *port = &at91_ports[co->index].uart; - int baud = 115200; - int bits = 8; - int parity = 'n'; - int flow = 'n'; - - if (port->membase == 0) /* Port not initialized yet - delay setup */ - return -ENODEV; - - UART_PUT_IDR(port, -1); /* disable interrupts */ - UART_PUT_CR(port, AT91_US_RSTSTA | AT91_US_RSTRX); - UART_PUT_CR(port, AT91_US_TXEN | AT91_US_RXEN); - - if (options) - uart_parse_options(options, &baud, &parity, &bits, &flow); - else - at91_console_get_options(port, &baud, &parity, &bits); - - return uart_set_options(port, co, baud, parity, bits, flow); -} - -static struct uart_driver at91_uart; - -static struct console at91_console = { - .name = AT91_DEVICENAME, - .write = at91_console_write, - .device = uart_console_device, - .setup = at91_console_setup, - .flags = CON_PRINTBUFFER, - .index = -1, - .data = &at91_uart, -}; - -#define AT91_CONSOLE_DEVICE &at91_console - -/* - * Early console initialization (before VM subsystem initialized). - */ -static int __init at91_console_init(void) -{ - if (at91_default_console_device) { - add_preferred_console(AT91_DEVICENAME, at91_default_console_device->id, NULL); - at91_init_port(&(at91_ports[at91_default_console_device->id]), at91_default_console_device); - register_console(&at91_console); - } - - return 0; -} -console_initcall(at91_console_init); - -/* - * Late console initialization. - */ -static int __init at91_late_console_init(void) -{ - if (at91_default_console_device && !(at91_console.flags & CON_ENABLED)) - register_console(&at91_console); - - return 0; -} -core_initcall(at91_late_console_init); - -#else -#define AT91_CONSOLE_DEVICE NULL -#endif - -static struct uart_driver at91_uart = { - .owner = THIS_MODULE, - .driver_name = "at91_serial", - .dev_name = AT91_DEVICENAME, - .major = SERIAL_AT91_MAJOR, - .minor = MINOR_START, - .nr = AT91_NR_UART, - .cons = AT91_CONSOLE_DEVICE, -}; - -#ifdef CONFIG_PM -static int at91_serial_suspend(struct platform_device *pdev, pm_message_t state) -{ - struct uart_port *port = platform_get_drvdata(pdev); - struct at91_uart_port *at91_port = (struct at91_uart_port *) port; - - if (device_may_wakeup(&pdev->dev) && !at91_suspend_entering_slow_clock()) - enable_irq_wake(port->irq); - else { - disable_irq_wake(port->irq); - uart_suspend_port(&at91_uart, port); - at91_port->suspended = 1; - } - - return 0; -} - -static int at91_serial_resume(struct platform_device *pdev) -{ - struct uart_port *port = platform_get_drvdata(pdev); - struct at91_uart_port *at91_port = (struct at91_uart_port *) port; - - if (at91_port->suspended) { - uart_resume_port(&at91_uart, port); - at91_port->suspended = 0; - } - - return 0; -} -#else -#define at91_serial_suspend NULL -#define at91_serial_resume NULL -#endif - -static int __devinit at91_serial_probe(struct platform_device *pdev) -{ - struct at91_uart_port *port; - int ret; - - port = &at91_ports[pdev->id]; - at91_init_port(port, pdev); - - ret = uart_add_one_port(&at91_uart, &port->uart); - if (!ret) { - device_init_wakeup(&pdev->dev, 1); - platform_set_drvdata(pdev, port); - } - - return ret; -} - -static int __devexit at91_serial_remove(struct platform_device *pdev) -{ - struct uart_port *port = platform_get_drvdata(pdev); - struct at91_uart_port *at91_port = (struct at91_uart_port *) port; - int ret = 0; - - clk_disable(at91_port->clk); - clk_put(at91_port->clk); - - device_init_wakeup(&pdev->dev, 0); - platform_set_drvdata(pdev, NULL); - - if (port) { - ret = uart_remove_one_port(&at91_uart, port); - kfree(port); - } - - return ret; -} - -static struct platform_driver at91_serial_driver = { - .probe = at91_serial_probe, - .remove = __devexit_p(at91_serial_remove), - .suspend = at91_serial_suspend, - .resume = at91_serial_resume, - .driver = { - .name = "at91_usart", - .owner = THIS_MODULE, - }, -}; - -static int __init at91_serial_init(void) -{ - int ret; - - ret = uart_register_driver(&at91_uart); - if (ret) - return ret; - - ret = platform_driver_register(&at91_serial_driver); - if (ret) - uart_unregister_driver(&at91_uart); - - return ret; -} - -static void __exit at91_serial_exit(void) -{ - platform_driver_unregister(&at91_serial_driver); - uart_unregister_driver(&at91_uart); -} - -module_init(at91_serial_init); -module_exit(at91_serial_exit); - -MODULE_AUTHOR("Rick Bronson"); -MODULE_DESCRIPTION("AT91 generic serial port driver"); -MODULE_LICENSE("GPL"); |