diff options
Diffstat (limited to 'drivers/serial/atmel_serial.c')
| -rw-r--r-- | drivers/serial/atmel_serial.c | 992 |
1 files changed, 0 insertions, 992 deletions
diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c deleted file mode 100644 index 9217ee6c786..00000000000 --- a/drivers/serial/atmel_serial.c +++ /dev/null @@ -1,992 +0,0 @@ -/* - * linux/drivers/char/atmel_serial.c - * - * Driver for Atmel AT91 / AT32 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/mach/serial_at91.h> -#include <asm/arch/board.h> -#include <asm/arch/at91_pdc.h> -#ifdef CONFIG_ARM -#include <asm/arch/cpu.h> -#include <asm/arch/gpio.h> -#endif - -#include "atmel_serial.h" - -#if defined(CONFIG_SERIAL_ATMEL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) -#define SUPPORT_SYSRQ -#endif - -#include <linux/serial_core.h> - -#ifdef CONFIG_SERIAL_ATMEL_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_ATMEL_MAJOR 204 -#define MINOR_START 154 -#define ATMEL_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_ATMEL_MAJOR TTY_MAJOR -#define MINOR_START 64 -#define ATMEL_DEVICENAME "ttyS" - -#endif - -#define ATMEL_ISR_PASS_LIMIT 256 - -#define UART_PUT_CR(port,v) writel(v, (port)->membase + ATMEL_US_CR) -#define UART_GET_MR(port) readl((port)->membase + ATMEL_US_MR) -#define UART_PUT_MR(port,v) writel(v, (port)->membase + ATMEL_US_MR) -#define UART_PUT_IER(port,v) writel(v, (port)->membase + ATMEL_US_IER) -#define UART_PUT_IDR(port,v) writel(v, (port)->membase + ATMEL_US_IDR) -#define UART_GET_IMR(port) readl((port)->membase + ATMEL_US_IMR) -#define UART_GET_CSR(port) readl((port)->membase + ATMEL_US_CSR) -#define UART_GET_CHAR(port) readl((port)->membase + ATMEL_US_RHR) -#define UART_PUT_CHAR(port,v) writel(v, (port)->membase + ATMEL_US_THR) -#define UART_GET_BRGR(port) readl((port)->membase + ATMEL_US_BRGR) -#define UART_PUT_BRGR(port,v) writel(v, (port)->membase + ATMEL_US_BRGR) -#define UART_PUT_RTOR(port,v) writel(v, (port)->membase + ATMEL_US_RTOR) - -// #define UART_GET_CR(port) readl((port)->membase + ATMEL_US_CR) // is write-only - - /* PDC registers */ -#define UART_PUT_PTCR(port,v) writel(v, (port)->membase + ATMEL_PDC_PTCR) -#define UART_GET_PTSR(port) readl((port)->membase + ATMEL_PDC_PTSR) - -#define UART_PUT_RPR(port,v) writel(v, (port)->membase + ATMEL_PDC_RPR) -#define UART_GET_RPR(port) readl((port)->membase + ATMEL_PDC_RPR) -#define UART_PUT_RCR(port,v) writel(v, (port)->membase + ATMEL_PDC_RCR) -#define UART_PUT_RNPR(port,v) writel(v, (port)->membase + ATMEL_PDC_RNPR) -#define UART_PUT_RNCR(port,v) writel(v, (port)->membase + ATMEL_PDC_RNCR) - -#define UART_PUT_TPR(port,v) writel(v, (port)->membase + ATMEL_PDC_TPR) -#define UART_PUT_TCR(port,v) writel(v, (port)->membase + ATMEL_PDC_TCR) -//#define UART_PUT_TNPR(port,v) writel(v, (port)->membase + ATMEL_PDC_TNPR) -//#define UART_PUT_TNCR(port,v) writel(v, (port)->membase + ATMEL_PDC_TNCR) - -static int (*atmel_open_hook)(struct uart_port *); -static void (*atmel_close_hook)(struct uart_port *); - -/* - * We wrap our port structure around the generic uart_port. - */ -struct atmel_uart_port { - struct uart_port uart; /* uart */ - struct clk *clk; /* uart clock */ - unsigned short suspended; /* is port suspended? */ -}; - -static struct atmel_uart_port atmel_ports[ATMEL_MAX_UART]; - -#ifdef SUPPORT_SYSRQ -static struct console atmel_console; -#endif - -/* - * Return TIOCSER_TEMT when transmitter FIFO and Shift register is empty. - */ -static u_int atmel_tx_empty(struct uart_port *port) -{ - return (UART_GET_CSR(port) & ATMEL_US_TXEMPTY) ? TIOCSER_TEMT : 0; -} - -/* - * Set state of the modem control output lines - */ -static void atmel_set_mctrl(struct uart_port *port, u_int mctrl) -{ - unsigned int control = 0; - unsigned int mode; - -#ifdef CONFIG_ARCH_AT91RM9200 - if (cpu_is_at91rm9200()) { - /* - * AT91RM9200 Errata #39: RTS0 is not internally connected to PA21. - * We need to drive the pin manually. - */ - if (port->mapbase == AT91RM9200_BASE_US0) { - if (mctrl & TIOCM_RTS) - at91_set_gpio_value(AT91_PIN_PA21, 0); - else - at91_set_gpio_value(AT91_PIN_PA21, 1); - } - } -#endif - - if (mctrl & TIOCM_RTS) - control |= ATMEL_US_RTSEN; - else - control |= ATMEL_US_RTSDIS; - - if (mctrl & TIOCM_DTR) - control |= ATMEL_US_DTREN; - else - control |= ATMEL_US_DTRDIS; - - UART_PUT_CR(port, control); - - /* Local loopback mode? */ - mode = UART_GET_MR(port) & ~ATMEL_US_CHMODE; - if (mctrl & TIOCM_LOOP) - mode |= ATMEL_US_CHMODE_LOC_LOOP; - else - mode |= ATMEL_US_CHMODE_NORMAL; - UART_PUT_MR(port, mode); -} - -/* - * Get state of the modem control input lines - */ -static u_int atmel_get_mctrl(struct uart_port *port) -{ - unsigned int status, ret = 0; - - status = UART_GET_CSR(port); - - /* - * The control signals are active low. - */ - if (!(status & ATMEL_US_DCD)) - ret |= TIOCM_CD; - if (!(status & ATMEL_US_CTS)) - ret |= TIOCM_CTS; - if (!(status & ATMEL_US_DSR)) - ret |= TIOCM_DSR; - if (!(status & ATMEL_US_RI)) - ret |= TIOCM_RI; - - return ret; -} - -/* - * Stop transmitting. - */ -static void atmel_stop_tx(struct uart_port *port) -{ - struct atmel_uart_port *atmel_port = (struct atmel_uart_port *) port; - - UART_PUT_IDR(port, ATMEL_US_TXRDY); -} - -/* - * Start transmitting. - */ -static void atmel_start_tx(struct uart_port *port) -{ - struct atmel_uart_port *atmel_port = (struct atmel_uart_port *) port; - - UART_PUT_IER(port, ATMEL_US_TXRDY); -} - -/* - * Stop receiving - port is in process of being closed. - */ -static void atmel_stop_rx(struct uart_port *port) -{ - struct atmel_uart_port *atmel_port = (struct atmel_uart_port *) port; - - UART_PUT_IDR(port, ATMEL_US_RXRDY); -} - -/* - * Enable modem status interrupts - */ -static void atmel_enable_ms(struct uart_port *port) -{ - UART_PUT_IER(port, ATMEL_US_RIIC | ATMEL_US_DSRIC | ATMEL_US_DCDIC | ATMEL_US_CTSIC); -} - -/* - * Control the transmission of a break signal - */ -static void atmel_break_ctl(struct uart_port *port, int break_state) -{ - if (break_state != 0) - UART_PUT_CR(port, ATMEL_US_STTBRK); /* start break */ - else - UART_PUT_CR(port, ATMEL_US_STPBRK); /* stop break */ -} - -/* - * Characters received (called from interrupt handler) - */ -static void atmel_rx_chars(struct uart_port *port) -{ - struct tty_struct *tty = port->info->tty; - unsigned int status, ch, flg; - - status = UART_GET_CSR(port); - while (status & ATMEL_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 & (ATMEL_US_PARE | ATMEL_US_FRAME | ATMEL_US_OVRE | ATMEL_US_RXBRK))) { - UART_PUT_CR(port, ATMEL_US_RSTSTA); /* clear error */ - if (status & ATMEL_US_RXBRK) { - status &= ~(ATMEL_US_PARE | ATMEL_US_FRAME); /* ignore side-effect */ - port->icount.brk++; - if (uart_handle_break(port)) - goto ignore_char; - } - if (status & ATMEL_US_PARE) - port->icount.parity++; - if (status & ATMEL_US_FRAME) - port->icount.frame++; - if (status & ATMEL_US_OVRE) - port->icount.overrun++; - - status &= port->read_status_mask; - - if (status & ATMEL_US_RXBRK) - flg = TTY_BREAK; - else if (status & ATMEL_US_PARE) - flg = TTY_PARITY; - else if (status & ATMEL_US_FRAME) - flg = TTY_FRAME; - } - - if (uart_handle_sysrq_char(port, ch)) - goto ignore_char; - - uart_insert_char(port, status, ATMEL_US_OVRE, ch, flg); - - ignore_char: - status = UART_GET_CSR(port); - } - - tty_flip_buffer_push(tty); -} - -/* - * Transmit characters (called from interrupt handler) - */ -static void atmel_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)) { - atmel_stop_tx(port); - return; - } - - while (UART_GET_CSR(port) & ATMEL_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)) - atmel_stop_tx(port); -} - -/* - * Interrupt handler - */ -static irqreturn_t atmel_interrupt(int irq, void *dev_id) -{ - struct uart_port *port = dev_id; - struct atmel_uart_port *atmel_port = (struct atmel_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 & ATMEL_US_RXRDY) - atmel_rx_chars(port); - - // TODO: All reads to CSR will clear these interrupts! - if (pending & ATMEL_US_RIIC) port->icount.rng++; - if (pending & ATMEL_US_DSRIC) port->icount.dsr++; - if (pending & ATMEL_US_DCDIC) - uart_handle_dcd_change(port, !(status & ATMEL_US_DCD)); - if (pending & ATMEL_US_CTSIC) - uart_handle_cts_change(port, !(status & ATMEL_US_CTS)); - if (pending & (ATMEL_US_RIIC | ATMEL_US_DSRIC | ATMEL_US_DCDIC | ATMEL_US_CTSIC)) - wake_up_interruptible(&port->info->delta_msr_wait); - - /* Interrupt transmit */ - if (pending & ATMEL_US_TXRDY) - atmel_tx_chars(port); - - if (pass_counter++ > ATMEL_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 atmel_startup(struct uart_port *port) -{ - struct atmel_uart_port *atmel_port = (struct atmel_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, atmel_interrupt, IRQF_SHARED, "atmel_serial", port); - if (retval) { - printk("atmel_serial: atmel_startup - Can't get irq\n"); - return retval; - } - - /* - * If there is a specific "open" function (to register - * control line interrupts) - */ - if (atmel_open_hook) { - retval = atmel_open_hook(port); - if (retval) { - free_irq(port->irq, port); - return retval; - } - } - - /* - * Finally, enable the serial port - */ - UART_PUT_CR(port, ATMEL_US_RSTSTA | ATMEL_US_RSTRX); - UART_PUT_CR(port, ATMEL_US_TXEN | ATMEL_US_RXEN); /* enable xmit & rcvr */ - - UART_PUT_IER(port, ATMEL_US_RXRDY); /* enable receive only */ - - return 0; -} - -/* - * Disable the port - */ -static void atmel_shutdown(struct uart_port *port) -{ - struct atmel_uart_port *atmel_port = (struct atmel_uart_port *) port; - - /* - * Disable all interrupts, port and break condition. - */ - UART_PUT_CR(port, ATMEL_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 (atmel_close_hook) - atmel_close_hook(port); -} - -/* - * Power / Clock management. - */ -static void atmel_serial_pm(struct uart_port *port, unsigned int state, unsigned int oldstate) -{ - struct atmel_uart_port *atmel_port = (struct atmel_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(atmel_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(atmel_port->clk); - break; - default: - printk(KERN_ERR "atmel_serial: unknown pm %d\n", state); - } -} - -/* - * Change the port parameters - */ -static void atmel_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) & ~(ATMEL_US_CHRL | ATMEL_US_NBSTOP | ATMEL_US_PAR); - - /* byte size */ - switch (termios->c_cflag & CSIZE) { - case CS5: - mode |= ATMEL_US_CHRL_5; - break; - case CS6: - mode |= ATMEL_US_CHRL_6; - break; - case CS7: - mode |= ATMEL_US_CHRL_7; - break; - default: - mode |= ATMEL_US_CHRL_8; - break; - } - - /* stop bits */ - if (termios->c_cflag & CSTOPB) - mode |= ATMEL_US_NBSTOP_2; - - /* parity */ - if (termios->c_cflag & PARENB) { - if (termios->c_cflag & CMSPAR) { /* Mark or Space parity */ - if (termios->c_cflag & PARODD) - mode |= ATMEL_US_PAR_MARK; - else - mode |= ATMEL_US_PAR_SPACE; - } - else if (termios->c_cflag & PARODD) - mode |= ATMEL_US_PAR_ODD; - else - mode |= ATMEL_US_PAR_EVEN; - } - else - mode |= ATMEL_US_PAR_NONE; - - spin_lock_irqsave(&port->lock, flags); - - port->read_status_mask = ATMEL_US_OVRE; - if (termios->c_iflag & INPCK) - port->read_status_mask |= (ATMEL_US_FRAME | ATMEL_US_PARE); - if (termios->c_iflag & (BRKINT | PARMRK)) - port->read_status_mask |= ATMEL_US_RXBRK; - - /* - * Characters to ignore - */ - port->ignore_status_mask = 0; - if (termios->c_iflag & IGNPAR) - port->ignore_status_mask |= (ATMEL_US_FRAME | ATMEL_US_PARE); - if (termios->c_iflag & IGNBRK) { - port->ignore_status_mask |= ATMEL_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 |= ATMEL_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) & ATMEL_US_TXEMPTY)) { barrier(); } - - /* disable receiver and transmitter */ - UART_PUT_CR(port, ATMEL_US_TXDIS | ATMEL_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, ATMEL_US_RSTSTA | ATMEL_US_RSTRX); - UART_PUT_CR(port, ATMEL_US_TXEN | ATMEL_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 *atmel_type(struct uart_port *port) -{ - return (port->type == PORT_ATMEL) ? "ATMEL_SERIAL" : NULL; -} - -/* - * Release the memory region(s) being used by 'port'. - */ -static void atmel_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 atmel_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, "atmel_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 atmel_config_port(struct uart_port *port, int flags) -{ - if (flags & UART_CONFIG_TYPE) { - port->type = PORT_ATMEL; - atmel_request_port(port); - } -} - -/* - * Verify the new serial_struct (for TIOCSSERIAL). - */ -static int atmel_verify_port(struct uart_port *port, struct serial_struct *ser) -{ - int ret = 0; - if (ser->type != PORT_UNKNOWN && ser->type != PORT_ATMEL) - 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 atmel_pops = { - .tx_empty = atmel_tx_empty, - .set_mctrl = atmel_set_mctrl, - .get_mctrl = atmel_get_mctrl, - .stop_tx = atmel_stop_tx, - .start_tx = atmel_start_tx, - .stop_rx = atmel_stop_rx, - .enable_ms = atmel_enable_ms, - .break_ctl = atmel_break_ctl, - .startup = atmel_startup, - .shutdown = atmel_shutdown, - .set_termios = atmel_set_termios, - .type = atmel_type, - .release_port = atmel_release_port, - .request_port = atmel_request_port, - .config_port = atmel_config_port, - .verify_port = atmel_verify_port, - .pm = atmel_serial_pm, -}; - -/* - * Configure the port from the platform device resource info. - */ -static void __devinit atmel_init_port(struct atmel_uart_port *atmel_port, struct platform_device *pdev) -{ - struct uart_port *port = &atmel_port->uart; - struct atmel_uart_data *data = pdev->dev.platform_data; - - port->iotype = UPIO_MEM; - port->flags = UPF_BOOT_AUTOCONF; - port->ops = &atmel_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 (data->regs) - /* Already mapped by setup code */ - port->membase = data->regs; - else { - port->flags |= UPF_IOREMAP; - port->membase = NULL; - } - - if (!atmel_port->clk) { /* for console, the clock could already be configured */ - atmel_port->clk = clk_get(&pdev->dev, "usart"); - clk_enable(atmel_port->clk); - port->uartclk = clk_get_rate(atmel_port->clk); - } -} - -/* - * Register board-specific modem-control line handlers. - */ -void __init atmel_register_uart_fns(struct atmel_port_fns *fns) -{ - if (fns->enable_ms) - atmel_pops.enable_ms = fns->enable_ms; - if (fns->get_mctrl) - atmel_pops.get_mctrl = fns->get_mctrl; - if (fns->set_mctrl) - atmel_pops.set_mctrl = fns->set_mctrl; - atmel_open_hook = fns->open; - atmel_close_hook = fns->close; - atmel_pops.pm = fns->pm; - atmel_pops.set_wake = fns->set_wake; -} - - -#ifdef CONFIG_SERIAL_ATMEL_CONSOLE -static void atmel_console_putchar(struct uart_port *port, int ch) -{ - while (!(UART_GET_CSR(port) & ATMEL_US_TXRDY)) - barrier(); - UART_PUT_CHAR(port, ch); -} - -/* - * Interrupts are disabled on entering - */ -static void atmel_console_write(struct console *co, const char *s, u_int count) -{ - struct uart_port *port = &atmel_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, ATMEL_US_RXRDY | ATMEL_US_TXRDY); - - uart_console_write(port, s, count, atmel_console_putchar); - - /* - * Finally, wait for transmitter to become empty - * and restore IMR - */ - do { - status = UART_GET_CSR(port); - } while (!(status & ATMEL_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 atmel_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) & (ATMEL_US_RXEN | ATMEL_US_TXEN); -// if (cr == (ATMEL_US_RXEN | ATMEL_US_TXEN)) { -// /* ok, the port was enabled */ -// } - - mr = UART_GET_MR(port) & ATMEL_US_CHRL; - if (mr == ATMEL_US_CHRL_8) - *bits = 8; - else - *bits = 7; - - mr = UART_GET_MR(port) & ATMEL_US_PAR; - if (mr == ATMEL_US_PAR_EVEN) - *parity = 'e'; - else if (mr == ATMEL_US_PAR_ODD) - *parity = 'o'; - - /* - * The serial core only rounds down when matching this to a - * supported baud rate. Make sure we don't end up slightly - * lower than one of those, as it would make us fall through - * to a much lower baud rate than we really want. - */ - quot = UART_GET_BRGR(port); - *baud = port->uartclk / (16 * (quot - 1)); -} - -static int __init atmel_console_setup(struct console *co, char *options) -{ - struct uart_port *port = &atmel_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, ATMEL_US_RSTSTA | ATMEL_US_RSTRX); - UART_PUT_CR(port, ATMEL_US_TXEN | ATMEL_US_RXEN); - - if (options) - uart_parse_options(options, &baud, &parity, &bits, &flow); - else - atmel_console_get_options(port, &baud, &parity, &bits); - - return uart_set_options(port, co, baud, parity, bits, flow); -} - -static struct uart_driver atmel_uart; - -static struct console atmel_console = { - .name = ATMEL_DEVICENAME, - .write = atmel_console_write, - .device = uart_console_device, - .setup = atmel_console_setup, - .flags = CON_PRINTBUFFER, - .index = -1, - .data = &atmel_uart, -}; - -#define ATMEL_CONSOLE_DEVICE &atmel_console - -/* - * Early console initialization (before VM subsystem initialized). - */ -static int __init atmel_console_init(void) -{ - if (atmel_default_console_device) { - add_preferred_console(ATMEL_DEVICENAME, atmel_default_console_device->id, NULL); - atmel_init_port(&(atmel_ports[atmel_default_console_device->id]), atmel_default_console_device); - register_console(&atmel_console); - } - - return 0; -} -console_initcall(atmel_console_init); - -/* - * Late console initialization. - */ -static int __init atmel_late_console_init(void) -{ - if (atmel_default_console_device && !(atmel_console.flags & CON_ENABLED)) - register_console(&atmel_console); - - return 0; -} -core_initcall(atmel_late_console_init); - -#else -#define ATMEL_CONSOLE_DEVICE NULL -#endif - -static struct uart_driver atmel_uart = { - .owner = THIS_MODULE, - .driver_name = "atmel_serial", - .dev_name = ATMEL_DEVICENAME, - .major = SERIAL_ATMEL_MAJOR, - .minor = MINOR_START, - .nr = ATMEL_MAX_UART, - .cons = ATMEL_CONSOLE_DEVICE, -}; - -#ifdef CONFIG_PM -static int atmel_serial_suspend(struct platform_device *pdev, pm_message_t state) -{ - struct uart_port *port = platform_get_drvdata(pdev); - struct atmel_uart_port *atmel_port = (struct atmel_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(&atmel_uart, port); - atmel_port->suspended = 1; - } - - return 0; -} - -static int atmel_serial_resume(struct platform_device *pdev) -{ - struct uart_port *port = platform_get_drvdata(pdev); - struct atmel_uart_port *atmel_port = (struct atmel_uart_port *) port; - - if (atmel_port->suspended) { - uart_resume_port(&atmel_uart, port); - atmel_port->suspended = 0; - } - - return 0; -} -#else -#define atmel_serial_suspend NULL -#define atmel_serial_resume NULL -#endif - -static int __devinit atmel_serial_probe(struct platform_device *pdev) -{ - struct atmel_uart_port *port; - int ret; - - port = &atmel_ports[pdev->id]; - atmel_init_port(port, pdev); - - ret = uart_add_one_port(&atmel_uart, &port->uart); - if (!ret) { - device_init_wakeup(&pdev->dev, 1); - platform_set_drvdata(pdev, port); - } - - return ret; -} - -static int __devexit atmel_serial_remove(struct platform_device *pdev) -{ - struct uart_port *port = platform_get_drvdata(pdev); - struct atmel_uart_port *atmel_port = (struct atmel_uart_port *) port; - int ret = 0; - - clk_disable(atmel_port->clk); - clk_put(atmel_port->clk); - - device_init_wakeup(&pdev->dev, 0); - platform_set_drvdata(pdev, NULL); - - if (port) { - ret = uart_remove_one_port(&atmel_uart, port); - kfree(port); - } - - return ret; -} - -static struct platform_driver atmel_serial_driver = { - .probe = atmel_serial_probe, - .remove = __devexit_p(atmel_serial_remove), - .suspend = atmel_serial_suspend, - .resume = atmel_serial_resume, - .driver = { - .name = "atmel_usart", - .owner = THIS_MODULE, - }, -}; - -static int __init atmel_serial_init(void) -{ - int ret; - - ret = uart_register_driver(&atmel_uart); - if (ret) - return ret; - - ret = platform_driver_register(&atmel_serial_driver); - if (ret) - uart_unregister_driver(&atmel_uart); - - return ret; -} - -static void __exit atmel_serial_exit(void) -{ - platform_driver_unregister(&atmel_serial_driver); - uart_unregister_driver(&atmel_uart); -} - -module_init(atmel_serial_init); -module_exit(atmel_serial_exit); - -MODULE_AUTHOR("Rick Bronson"); -MODULE_DESCRIPTION("Atmel AT91 / AT32 serial port driver"); -MODULE_LICENSE("GPL"); |