diff options
Diffstat (limited to 'target/linux/ubicom32/files/drivers/serial/ubi32_uarttio.c')
| -rw-r--r-- | target/linux/ubicom32/files/drivers/serial/ubi32_uarttio.c | 1172 |
1 files changed, 0 insertions, 1172 deletions
diff --git a/target/linux/ubicom32/files/drivers/serial/ubi32_uarttio.c b/target/linux/ubicom32/files/drivers/serial/ubi32_uarttio.c deleted file mode 100644 index 7aa3742..0000000 --- a/target/linux/ubicom32/files/drivers/serial/ubi32_uarttio.c +++ /dev/null @@ -1,1172 +0,0 @@ -/* - * drivers/serial/ubi32_uarttio.c - * Ubicom32 Serial Virtual Peripherial Driver - * - * (C) Copyright 2009, Ubicom, Inc. - * - * This file is part of the Ubicom32 Linux Kernel Port. - * - * The Ubicom32 Linux Kernel Port 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. - * - * The Ubicom32 Linux Kernel Port 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 the Ubicom32 Linux Kernel Port. If not, - * see <http://www.gnu.org/licenses/>. - */ - -#include <linux/module.h> -#include <linux/ioport.h> -#include <linux/init.h> -#include <linux/console.h> -#include <linux/sysrq.h> -#include <linux/platform_device.h> -#include <linux/tty.h> -#include <linux/tty_flip.h> -#include <linux/serial_core.h> - -#include <asm/ip5000.h> -#include <asm/gpio.h> -#include <asm/thread.h> -#include <asm/uart_tio.h> - -#define DRIVER_NAME "ubi32_uarttio" - -/* - * For storing the module parameters. - */ -#define UBI32_UARTTIO_MAX_PARAM_LEN 80 -static char utio_ports_param[UBI32_UARTTIO_MAX_PARAM_LEN]; - -/* - * UART name and device definitions - */ -#define UBI32_UARTTIO_NAME "ttyUV" // XXX -#define UBI32_UARTTIO_MAJOR 206 // XXX -#define UBI32_UARTTIO_MINOR 64 // XXX - -/* - * The following structures are allocated statically because the - * memory allocation subsystem is not initialized this early on - */ - -/* - * Per port structure - */ -struct ubi32_uarttio_port { - struct uarttio_uart *uart; - unsigned int tx_pin; - unsigned int rx_pin; - - struct uart_port port; - - u8_t added; - - /* - * If this value is set, the port has had its direction set already - */ - u8_t port_init; -}; -static struct ubi32_uarttio_port uarttio_ports[CONFIG_SERIAL_UBI32_UARTTIO_NR_UARTS]; - -/* - * Number of ports currently initialized - */ -static int uarttio_nports; - -/* - * Per device structure - */ -struct ubi32_uarttio_instance { - struct uarttio_regs *regs; - struct ubi32_uarttio_port *ports; - - u8_t irq_requested; - u8_t driver_registered; - u8_t irq; -}; -static struct ubi32_uarttio_instance uarttio_inst; - -#ifdef CONFIG_SERIAL_UBI32_UARTTIO_CONSOLE -static struct console ubi32_uarttio_console; -#define UBI32_UARTTIO_CONSOLE &ubi32_uarttio_console -#else -#define UBI32_UARTTIO_CONSOLE NULL -#endif - -static struct uart_driver ubi32_uarttio_uart_driver = { - .owner = THIS_MODULE, - .driver_name = DRIVER_NAME, - .dev_name = UBI32_UARTTIO_NAME, - .major = UBI32_UARTTIO_MAJOR, - .minor = UBI32_UARTTIO_MINOR, - .cons = UBI32_UARTTIO_CONSOLE, -}; - -#ifdef UBI32_UARTTIO_UNUSED -/* - * ubi32_uarttio_get_send_space - */ -static int ubi32_uarttio_get_send_space(struct uarttio_uart *uart) -{ - int count = uart->tx_fifo_head - uart->tx_fifo_tail; - if (count < 0) { - count += uart->tx_fifo_size; - } - return uart->tx_fifo_size - count; -} -#endif - -/* - * ubi32_uarttio_get_recv_ready - */ -static int ubi32_uarttio_get_recv_ready(struct uarttio_uart *uart) -{ - int count = uart->rx_fifo_head - uart->rx_fifo_tail; - if (count < 0) { - count += uart->rx_fifo_size; - } - return count; -} - -/* - * ubi32_uarttio_get_char() - */ -static u8_t ubi32_uarttio_get_char(struct uarttio_uart *uart) -{ - /* - * Retrieve byte - */ - u32_t tail = uart->rx_fifo_tail; - u8_t data = uart->rx_fifo[tail]; - - if (++tail == uart->rx_fifo_size) { - tail = 0; - } - uart->rx_fifo_tail = tail; - - return data; -} - -/* - * ubi32_uarttio_put_char() - */ -static int ubi32_uarttio_put_char(struct uarttio_uart *uart, u8_t c) -{ - u32_t head = uart->tx_fifo_head; - u32_t prev = head; - - /* - * Wrap - */ - if (++head == uart->tx_fifo_size) { - head = 0; - } - - /* - * If there isn't any space, return EBUSY - */ - if (head == uart->tx_fifo_tail) { - return -EBUSY; - } - - /* - * Put the character in the queue - */ - uart->tx_fifo[prev] = c; - uart->tx_fifo_head = head; - - return 0; -} - -/* - * ubi32_uarttio_set_baud - */ -static int ubi32_uarttio_set_baud(struct ubi32_uarttio_port *uup, unsigned int baud) -{ - if (uup->uart->current_baud_rate == baud) { - return 0; - } - - uup->uart->baud_rate = baud; - uup->uart->flags |= UARTTIO_UART_FLAG_SET_RATE; - while (uup->uart->flags & UARTTIO_UART_FLAG_SET_RATE) { - cpu_relax(); - } - - if (uup->uart->current_baud_rate != baud) { - /* - * Failed to set baud rate - */ - printk(KERN_WARNING "Invalid baud rate %u, running at %u\n", baud, uup->uart->current_baud_rate); - return -EINVAL; - } - - return 0; -} - -/* - * ubi32_uarttio_handle_receive - */ -static void ubi32_uarttio_handle_receive(struct ubi32_uarttio_port *uup, int stat) -{ - struct uarttio_uart *uart = uup->uart; - struct uart_port *port = &uup->port; - struct tty_struct *tty = port->info->port.tty; - unsigned char ch = 0; - char flag = TTY_NORMAL; - int count; - - if ((stat & (UARTTIO_UART_INT_RX | UARTTIO_UART_INT_RXFRAME | UARTTIO_UART_INT_RXOVF)) == 0) { - return; - } - - if (stat & UARTTIO_UART_INT_RX) { - count = ubi32_uarttio_get_recv_ready(uart); - port->icount.rx += count; - } - - if (stat & UARTTIO_UART_INT_RXOVF) { - port->icount.overrun++; - } - - if (stat & UARTTIO_UART_INT_RXFRAME) { - port->icount.frame++; - } - - stat &= ~port->ignore_status_mask; - - if (stat & UARTTIO_UART_INT_RX) { - int i; - for (i = 0; i < count; i++) { - ch = ubi32_uarttio_get_char(uart); - tty_insert_flip_char(tty, ch, flag); - } - } - - if (stat & UARTTIO_UART_INT_RXFRAME) { - tty_insert_flip_char(tty, 0, TTY_FRAME); - } - - if (stat & UARTTIO_UART_INT_RXOVF) { - tty_insert_flip_char(tty, 0, TTY_OVERRUN); - } -} - -/* - * ubi32_uarttio_stop_tx - * interrupts are disabled on entry - */ -static void ubi32_uarttio_stop_tx(struct uart_port *port) -{ - struct ubi32_uarttio_port *uup = port->private_data; - - uup->uart->int_mask &= ~UARTTIO_UART_INT_TXBE; -} - -/* - * ubi32_uarttio_handle_transmit - */ -static void ubi32_uarttio_handle_transmit(struct ubi32_uarttio_port *uup, int stat) -{ - struct uarttio_uart *uart = uup->uart; - struct uart_port *port = &uup->port; - struct circ_buf *xmit = &port->info->xmit; - - if (!(stat & UARTTIO_UART_INT_TXBE)) { - return; - } - - if (port->x_char) { - if (ubi32_uarttio_put_char(uart, port->x_char)) { - return; - } - port->x_char = 0; - port->icount.tx++; - return; - } - - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { - ubi32_uarttio_stop_tx(port); - return; - } - - /* - * Send as many characters as we can - */ - while (ubi32_uarttio_put_char(uart, xmit->buf[xmit->tail]) == 0) { - xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); - port->icount.tx++; - if (uart_circ_empty(xmit)) { - break; - } - } - - /* wake up */ - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) { - uart_write_wakeup(port); - } - - if (uart_circ_empty(xmit)) { - ubi32_uarttio_stop_tx(port); - } -} - -/* - * ubi32_uarttio_start_tx - * port is locked and interrupts are disabled - */ -static void ubi32_uarttio_start_tx(struct uart_port *port) -{ - struct ubi32_uarttio_port *uup = port->private_data; - struct uarttio_uart *uart = uup->uart; - - uart->int_mask |= UARTTIO_UART_INT_TXBE; -} - -/* - * ubi32_uarttio_stop_rx - * Interrupts are enabled - */ -static void ubi32_uarttio_stop_rx(struct uart_port *port) -{ - struct ubi32_uarttio_port *uup = port->private_data; - struct uarttio_uart *uart = uup->uart; - - /* - * don't forward any more data (like !CREAD) - */ - uart->int_mask &= ~UARTTIO_UART_INT_RX; - port->ignore_status_mask = UARTTIO_UART_INT_RX; -} - -/* - * ubi32_uarttio_enable_ms - * Set the modem control timer to fire immediately. - */ -static void ubi32_uarttio_enable_ms(struct uart_port *port) -{ - /* N/A */ -} - -/* - * ubi32_uarttio_isr - */ -static irqreturn_t ubi32_uarttio_isr(int irq, void *appdata) -{ - struct ubi32_uarttio_port *uup = uarttio_ports; - int i; - - /* - * Service all of the ports - */ - for (i = 0; i < uarttio_nports; i++) { - unsigned int flags; - - if (!(uup->uart->flags & UARTTIO_UART_FLAG_ENABLED)) { - uup++; - continue; - } - - spin_lock(&uup->port.lock); - - flags = uup->uart->int_flags; - - uup->uart->int_flags = 0; - - ubi32_uarttio_handle_receive(uup, flags); - ubi32_uarttio_handle_transmit(uup, flags); - - tty_flip_buffer_push(uup->port.info->port.tty); - - spin_unlock(&uup->port.lock); - - uup++; - } - - return IRQ_HANDLED; -} - -/* - * ubi32_uarttio_tx_empty - * Return TIOCSER_TEMT when transmitter is not busy. - */ -static unsigned int ubi32_uarttio_tx_empty(struct uart_port *port) -{ - struct ubi32_uarttio_port *uup = port->private_data; - - if (uup->uart->tx_fifo_head == uup->uart->tx_fifo_tail) { - return TIOCSER_TEMT; - } - - return 0; -} - -/* - * ubi32_uarttio_get_mctrl - */ -static unsigned int ubi32_uarttio_get_mctrl(struct uart_port *port) -{ - return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; -} - -/* - * ubi32_uarttio_set_mctrl - */ -static void ubi32_uarttio_set_mctrl(struct uart_port *port, unsigned int mctrl) -{ - /* N/A */ -} - -/* - * ubi32_uarttio_break_ctl - */ -static void ubi32_uarttio_break_ctl(struct uart_port *port, int break_state) -{ - /* N/A */ -} - -/* - * ubi32_uarttio_startup - */ -static int ubi32_uarttio_startup(struct uart_port *port) -{ - struct ubi32_uarttio_port *uup = port->private_data; - struct uarttio_uart *uart = uup->uart; - - uart->flags |= UARTTIO_UART_FLAG_ENABLED; - - uart->int_mask |= UARTTIO_UART_INT_TXBE | UARTTIO_UART_INT_RX; - - return 0; -} - -/* - * ubi32_uarttio_shutdown - */ -static void ubi32_uarttio_shutdown(struct uart_port *port) -{ - struct ubi32_uarttio_port *uup = port->private_data; - struct uarttio_uart *uart = uup->uart; - - uart->int_mask = 0; - uart->flags &= ~UARTTIO_UART_FLAG_ENABLED; -} - -/* - * ubi32_uarttio_set_termios - */ -static void ubi32_uarttio_set_termios(struct uart_port *port, struct ktermios *termios, struct ktermios *old) -{ - struct ubi32_uarttio_port *uup = port->private_data; - unsigned long flags; - unsigned int baud; - - spin_lock_irqsave(&port->lock, flags); - -#if 0 - port->read_status_mask = UBI32_UARTTIO_RX | UBI32_UARTTIO_RXOVF | UBI32_UARTTIO_TXOVF; - - if (termios->c_iflag & INPCK) { - port->read_status_mask |= UBI32_UARTTIO_RXFRAME; - } -#endif - - port->ignore_status_mask = 0; - if (termios->c_iflag & IGNPAR) { - port->ignore_status_mask |= UARTTIO_UART_INT_RXFRAME | - UARTTIO_UART_INT_RXOVF; - } - - /* - * ignore all characters if CREAD is not set - */ - if ((termios->c_cflag & CREAD) == 0) { - port->ignore_status_mask |= UARTTIO_UART_INT_RX | - UARTTIO_UART_INT_RXFRAME | - UARTTIO_UART_INT_RXOVF; - } - - /* update timeout */ - baud = uart_get_baud_rate(port, termios, old, 0, 460800); - uart_update_timeout(port, termios->c_cflag, baud); - - ubi32_uarttio_set_baud(uup, baud); - spin_unlock_irqrestore(&port->lock, flags); -} - -/* - * ubi32_uarttio_type - */ -static const char *ubi32_uarttio_type(struct uart_port *port) -{ - return (port->type == PORT_UBI32_UARTTIO) ? "UBI32_UARTTIO" : NULL; -} - -/* - * ubi32_uarttio_release_port - * Release the memory region(s) being used by 'port'. - */ -static void ubi32_uarttio_release_port(struct uart_port *port) -{ -} - -/* - * ubi32_uarttio_request_port - * Request the memory region(s) being used by 'port'. - */ -static int ubi32_uarttio_request_port(struct uart_port *port) -{ - return 0; -} - -/* - * ubi32_uarttio_config_port - * Configure/autoconfigure the port. - */ -static void ubi32_uarttio_config_port(struct uart_port *port, int flags) -{ - if ((flags & UART_CONFIG_TYPE) && (ubi32_uarttio_request_port(port) == 0)) { - port->type = PORT_UBI32_UARTTIO; - } -} - -/* - * ubi32_uarttio_verify_port - * Verify the new serial_struct (for TIOCSSERIAL). - * - * The only change we allow are to the flags and type, and - * even then only between PORT_UBI32_UARTTIO and PORT_UNKNOWN - */ -static int ubi32_uarttio_verify_port(struct uart_port *port, struct serial_struct *ser) -{ - return 0; -} - -static struct uart_ops ubi32_uarttio_pops = { - .tx_empty = ubi32_uarttio_tx_empty, - .set_mctrl = ubi32_uarttio_set_mctrl, - .get_mctrl = ubi32_uarttio_get_mctrl, - .stop_tx = ubi32_uarttio_stop_tx, - .start_tx = ubi32_uarttio_start_tx, - .stop_rx = ubi32_uarttio_stop_rx, - .enable_ms = ubi32_uarttio_enable_ms, - .break_ctl = ubi32_uarttio_break_ctl, - .startup = ubi32_uarttio_startup, - .shutdown = ubi32_uarttio_shutdown, - .set_termios = ubi32_uarttio_set_termios, - .type = ubi32_uarttio_type, - .release_port = ubi32_uarttio_release_port, - .request_port = ubi32_uarttio_request_port, - .config_port = ubi32_uarttio_config_port, - .verify_port = ubi32_uarttio_verify_port, -}; - -/* - * ubi32_uarttio_add_ports - */ -static int __init ubi32_uarttio_add_ports(void) -{ - int res = 0; - struct ubi32_uarttio_port *uup = uarttio_ports; - int i = 0; - - for (i = 0; i < uarttio_nports; i++) { - /* - * Setup the GPIOs - */ - res = gpio_request(uup->tx_pin, "ubi32_uarttio_tx"); - if (res) { - printk(KERN_WARNING "Failed to request GPIO %d\n", uup->tx_pin); - res = -EBUSY; - goto next; - } - - res = gpio_request(uup->rx_pin, "ubi32_uarttio_rx"); - if (res) { - gpio_free(uup->tx_pin); - printk(KERN_WARNING "Failed to request GPIO %d\n", uup->rx_pin); - res = -EBUSY; - goto next; - } - - res = uart_add_one_port(&ubi32_uarttio_uart_driver, &uup->port); - if (res) { - gpio_free(uup->rx_pin); - gpio_free(uup->tx_pin); - res = -ENODEV; - printk(KERN_WARNING "Failed to add port %d,%d\n", uup->tx_pin, uup->rx_pin); - goto next; - } - uup->added = 1; - - /* - * Set the direction of the ports now, after we're sure that everything is ok - */ - if (!uup->port_init) { - gpio_direction_output(uup->tx_pin, 1); - gpio_direction_input(uup->rx_pin); - } - -next: - uup++; - } - return res; -} - -/* - * ubi32_uarttio_cleanup - */ -static void ubi32_uarttio_cleanup(void) -{ - struct ubi32_uarttio_port *uup; - int i; - - /* - * Stop the hardware thread - */ - if (uarttio_inst.regs) { - thread_disable(uarttio_inst.regs->thread); - } - if (uarttio_inst.irq_requested) { - free_irq(uarttio_inst.irq, NULL); - } - - /* - * Get rid of the ports - */ - uup = uarttio_inst.ports; - for (i = 0; i < uarttio_nports; i++) { - gpio_free(uup->tx_pin); - gpio_free(uup->rx_pin); - if (uup->added) { - uart_remove_one_port(&ubi32_uarttio_uart_driver, &uup->port); - } - uup++; - } - - if (uarttio_inst.driver_registered) { - uart_unregister_driver(&ubi32_uarttio_uart_driver); - } -} - -/* - * ubi32_uarttio_setup_port - * Setup a port in the TIO registers - */ -static int ubi32_uarttio_setup_port(int index, - struct uarttio_uart *uart, - unsigned int baud, unsigned int tx_pin, - unsigned int rx_pin) -{ - struct ubi32_uarttio_port *uup = &uarttio_ports[index]; - void *tx_port = ubi_gpio_get_port(tx_pin); - void *rx_port = ubi_gpio_get_port(rx_pin); - - /* - * Verify the ports are on chip - */ - if (!tx_port || !rx_port) { - printk(KERN_WARNING "Invalid port(s) specified: %u or %u\n", tx_pin, rx_pin); - return -EINVAL; - } - - uup->tx_pin = tx_pin; - uup->rx_pin = rx_pin; - uup->uart = uart; - - /* - * Setup the port structure - */ - uup->port.ops = &ubi32_uarttio_pops; - uup->port.line = index; - uup->port.iotype = UPIO_MEM; - uup->port.flags = UPF_BOOT_AUTOCONF; - uup->port.fifosize = uup->uart->tx_fifo_size; - uup->port.private_data = uup; - - /* - * We share this IRQ across all ports - */ - uup->port.irq = uarttio_inst.irq; - - /* - * We really don't have a mem/map base but without these variables - * set, the serial_core won't startup. - */ - uup->port.membase = (void __iomem *)uup; - uup->port.mapbase = (resource_size_t)uup; - spin_lock_init(&uup->port.lock); - - /* - * Set up the hardware - */ - uart->flags = UARTTIO_UART_FLAG_SET_RATE | UARTTIO_UART_FLAG_RESET; - - uart->tx_port = (unsigned int)tx_port; - uart->tx_pin = gpio_pin_index(tx_pin); - uart->tx_bits = 8; - uart->tx_stop_bits = 1; - - uart->rx_port = (unsigned int)rx_port; - uart->rx_pin = gpio_pin_index(rx_pin); - uart->rx_bits = 8; - uart->rx_stop_bits = 1; - - uart->baud_rate = baud; - - return 0; -} - -enum ubi32_uarttio_parse_states { - UBI32_UARTTIO_PARSE_STATE_BAUD, - UBI32_UARTTIO_PARSE_STATE_TX_PIN, - UBI32_UARTTIO_PARSE_STATE_RX_PIN, - UBI32_UARTTIO_PARSE_STATE_HS, - UBI32_UARTTIO_PARSE_STATE_CTS_PIN, - UBI32_UARTTIO_PARSE_STATE_RTS_PIN, -}; - -/* - * ubi32_uarttio_parse_param - */ -static int ubi32_uarttio_parse_param(char *str) -{ - int res; - int i; - int baud = 0; - int tx_pin = 0; - int rx_pin = 0; - int hs = 0; - int cts_pin = 0; - int rts_pin = 0; - int nfound = 0; - enum ubi32_uarttio_parse_states state = UBI32_UARTTIO_PARSE_STATE_BAUD; - struct uarttio_uart *uart = uarttio_inst.regs->uarts; - - /* - * Run though the options and generate the proper structures - */ - res = get_option(&str, &i); - while ((res == 2) || (res == 1)) { - switch (state) { - case UBI32_UARTTIO_PARSE_STATE_BAUD: - /* - * If we are here and nfound > 0 then create the port - * based on the previous input - */ - if (nfound) { - /* - * Create the port - */ - if (ubi32_uarttio_setup_port(nfound - 1, uart, baud, tx_pin, rx_pin)) { - /* - * Port was invalid - */ - goto fail; - } else { - printk(KERN_INFO "Serial port %d: tx=%d:rx=%d @ %d\n", nfound, tx_pin, rx_pin, baud); - uart++; - } - } - - /* - * Reset the variables and go to the next state - */ - hs = 0; - baud = i; - state = UBI32_UARTTIO_PARSE_STATE_TX_PIN; - break; - - case UBI32_UARTTIO_PARSE_STATE_TX_PIN: - tx_pin = i; - state = UBI32_UARTTIO_PARSE_STATE_RX_PIN; - break; - - case UBI32_UARTTIO_PARSE_STATE_RX_PIN: - rx_pin = i; - state = UBI32_UARTTIO_PARSE_STATE_HS; - break; - - case UBI32_UARTTIO_PARSE_STATE_HS: - hs = i; - if (hs) { - state = UBI32_UARTTIO_PARSE_STATE_CTS_PIN; - break; - } - - if (nfound == uarttio_inst.regs->max_uarts) { - printk(KERN_WARNING "Maximum number of serial ports reached\n"); - goto done; - } - nfound++; - state = UBI32_UARTTIO_PARSE_STATE_BAUD; - break; - - case UBI32_UARTTIO_PARSE_STATE_CTS_PIN: - cts_pin = i; - state = UBI32_UARTTIO_PARSE_STATE_RTS_PIN; - break; - - case UBI32_UARTTIO_PARSE_STATE_RTS_PIN: - rts_pin = i; - - if (nfound == uarttio_inst.regs->max_uarts) { - printk(KERN_WARNING "Maximum number of serial ports reached\n"); - goto done; - } - nfound++; - state = UBI32_UARTTIO_PARSE_STATE_BAUD; - break; - } - res = get_option(&str, &i); - } - - if ((res > 2) || state != UBI32_UARTTIO_PARSE_STATE_BAUD) { - printk(KERN_WARNING "Parameter syntax error.\n"); - res = -EINVAL; - goto fail; - } - - /* - * Create the final port - */ - if (ubi32_uarttio_setup_port(nfound - 1, uart, baud, tx_pin, rx_pin)) { - goto fail; - } - printk(KERN_INFO "Serial port %d: tx=%d:rx=%d @ %d\n", nfound, tx_pin, rx_pin, baud); - -done: - uarttio_nports = nfound; - - return nfound ? 0 : -ENODEV; - -fail: - /* - * Reset the ports - */ - uart = uarttio_inst.regs->uarts; - for (i = 0; i < uarttio_inst.regs->max_uarts; i++) { - uart->flags = 0; - uart++; - } - - return res; -} - -/* - * ubi32_uarttio_probe - */ -static int ubi32_uarttio_probe(void) -{ - int ret; - struct uarttio_node *uart_node; - char *str = utio_ports_param; - static int probed; - static int probe_result; - - /* - * We only want to be probed once, we could be probed twice - * for example if we are used as a console - */ - if (probed) { - return probe_result; - } - probed = 1; - - /* - * Extract the TIO name from the setup string - */ - while (*str) { - if (*str == ',') { - *str++ = 0; - break; - } - str++; - } - - if (!*str) { - probe_result = -EINVAL; - return -EINVAL; - } - - uart_node = (struct uarttio_node *)devtree_find_node(utio_ports_param); - if (!uart_node) { - probe_result = -ENODEV; - return -ENODEV; - } - - uarttio_inst.irq = uart_node->dn.recvirq; - uarttio_inst.regs = uart_node->regs; - - /* - * Parse module parameters. - */ - ret = ubi32_uarttio_parse_param(str); - if (ret != 0) { - ubi32_uarttio_cleanup(); - probe_result = ret; - return ret; - } - - ubi32_uarttio_uart_driver.nr = uarttio_nports; - - return 0; -} - -#if defined(CONFIG_SERIAL_UBI32_UARTTIO_CONSOLE) -/* - * ubi32_uarttio_console_setup - */ -static int __init ubi32_uarttio_console_setup(struct console *co, char *options) -{ - int baud; - int bits = 8; - int parity = 'n'; - int flow = 'n'; - struct ubi32_uarttio_port *uup; - - /* - * Check whether an invalid uart number has been specified, and - * if so, search for the first available port that does have - * console support. - */ - if (co->index == -1 || co->index >= uarttio_nports) { - co->index = 0; - } - uup = &uarttio_ports[co->index]; - baud = uup->uart->baud_rate; - uup->uart->flags |= UARTTIO_UART_FLAG_ENABLED; - - /* - * Setup the GPIOs - * We have to use the direct interface because the gpio - * subsystem is not available at this point. - */ - uup->port_init = 1; - UBICOM32_GPIO_SET_PIN_HIGH(uup->tx_pin); - UBICOM32_GPIO_SET_PIN_OUTPUT(uup->tx_pin); - UBICOM32_GPIO_SET_PIN_INPUT(uup->rx_pin); - - /* - * Start the thread - */ - thread_enable(uarttio_inst.regs->thread); - - /* - * Process options - */ - if (options) { - uart_parse_options(options, &baud, &parity, &bits, &flow); - if (ubi32_uarttio_set_baud(uup, baud)) { - baud = uup->uart->current_baud_rate; - } - } - - return uart_set_options(&uup->port, co, baud, 'n', 8, 'n'); -} - -/* - * ubi32_uarttio_console_putchar - */ -static void ubi32_uarttio_console_putchar(struct uart_port *port, int ch) -{ - struct ubi32_uarttio_port *uup = port->private_data; - - while (ubi32_uarttio_put_char(uup->uart, ch)) { - cpu_relax(); - } -} - -/* - * ubi32_uarttio_console_write - * Interrupts are disabled on entering - */ -static void ubi32_uarttio_console_write(struct console *co, const char *s, unsigned int count) -{ - struct uart_port *port = &(uarttio_ports[co->index].port); - unsigned long flags = 0; - - spin_lock_irqsave(&port->lock, flags); - uart_console_write(port, s, count, ubi32_uarttio_console_putchar); - spin_unlock_irqrestore(&port->lock, flags); -} - -static struct console ubi32_uarttio_console = { - .name = UBI32_UARTTIO_NAME, - .write = ubi32_uarttio_console_write, - .device = uart_console_device, - .setup = ubi32_uarttio_console_setup, - .flags = CON_PRINTBUFFER, - .index = -1, - .data = &ubi32_uarttio_uart_driver, -}; - -static int __init ubi32_uarttio_console_init(void) -{ - int res; - - res = ubi32_uarttio_probe(); - if (res) { - return res; - } - - register_console(&ubi32_uarttio_console); - return 0; -} -console_initcall(ubi32_uarttio_console_init); -#endif /* CONFIG_SERIAL_UBI32_UARTTIO_CONSOLE */ - -/* - * ubi32_serial_suspend - */ -static int ubi32_uarttio_suspend(struct platform_device *pdev, pm_message_t state) -{ - int i; - for (i = 0; i < uarttio_nports; i++) { - uart_suspend_port(&ubi32_uarttio_uart_driver, &uarttio_ports[i].port); - } - - return 0; -} - -/* - * ubi32_serial_resume - */ -static int ubi32_uarttio_resume(struct platform_device *pdev) -{ - int i; - for (i = 0; i < uarttio_nports; i++) { - uart_resume_port(&ubi32_uarttio_uart_driver, &uarttio_ports[i].port); - } - - return 0; -} - -/* - * ubi32_uarttio_remove - */ -static int __devexit ubi32_uarttio_remove(struct platform_device *pdev) -{ - ubi32_uarttio_cleanup(); - - uart_unregister_driver(&ubi32_uarttio_uart_driver); - - return 0; -} - -static struct platform_driver ubi32_uarttio_platform_driver = { - .remove = __devexit_p(ubi32_uarttio_remove), - .suspend = ubi32_uarttio_suspend, - .resume = ubi32_uarttio_resume, - .driver = { - .name = DRIVER_NAME, - .owner = THIS_MODULE, - }, -}; - -#ifndef MODULE -/* - * Called at boot time. - * - * uarttio=TIONAME,(baud,tx_pin,rx_pin,handshake[,cts_pin,rts_pin],...) - * TIONAME is the name of the devtree node which describes the UARTTIO - * pin is the index of the pin, i.e. PA4 is 5 [(port * 32) + pin] - * handshake = 1 to enable handshaking, provide cts_pin, rts_pin (UNSUPPORTED) - * handshake = 0 to disable handshaking, do not provide cts_pin, rts_pin - * Ex: uarttio=UARTTIO,57600,7,6,0,9600,8,9,0 - */ -static int __init ubi32_uarttio_setup(char *str) -{ - strncpy(utio_ports_param, str, UBI32_UARTTIO_MAX_PARAM_LEN); - utio_ports_param[UBI32_UARTTIO_MAX_PARAM_LEN - 1] = 0; - return 1; -} -__setup("uarttio=", ubi32_uarttio_setup); -#endif - -/* - * ubi32_uarttio_init - */ -static int __init ubi32_uarttio_init(void) -{ - int ret; - int i; - - ret = ubi32_uarttio_probe(); - if (ret) { - return ret; - } - - /* - * Request the IRQ (do it here since many ports share the same IRQ) - */ - ret = request_irq(uarttio_inst.irq, ubi32_uarttio_isr, IRQF_DISABLED, DRIVER_NAME, NULL); - if (ret != 0) { - printk(KERN_WARNING "Could not request IRQ %d\n", uarttio_inst.irq); - goto fail; - } - uarttio_inst.irq_requested = 1; - - /* - * Register the UART driver and add the ports - */ - ret = uart_register_driver(&ubi32_uarttio_uart_driver); - if (ret != 0) { - goto fail; - } - uarttio_inst.driver_registered = 1; - - ret = ubi32_uarttio_add_ports(); - if (ret != 0) { - ubi32_uarttio_cleanup(); - return ret; - } - - /* - * Start the thread - */ - thread_enable(uarttio_inst.regs->thread); - - for (i = 0; i < uarttio_nports; i++) { - pr_info("Serial: Ubicom32 uarttio #%d: tx:%d rx:%d baud:%d\n", - i, uarttio_ports[i].tx_pin, uarttio_ports[i].rx_pin, - uarttio_ports[i].uart->current_baud_rate); - } - pr_info("Serial: Ubicom32 uarttio started on thread:%d irq:%d\n", uarttio_inst.regs->thread, uarttio_inst.irq); - - return ret; - -fail: - ubi32_uarttio_cleanup(); - return ret; -} -module_init(ubi32_uarttio_init); - -/* - * ubi32_uarttio_exit - */ -static void __exit ubi32_uarttio_exit(void) -{ - platform_driver_unregister(&ubi32_uarttio_platform_driver); -} -module_exit(ubi32_uarttio_exit); - -module_param_string(ports, utio_ports_param, sizeof(utio_ports_param), 0444); -MODULE_PARM_DESC(ports, "Sets the ports to allocate: ports=TIONAME,(baud,txpin,rxpin,handshake[,ctspin,rtspin],...)\n" - " TIONAME is the name of the devtree node which describes the UARTTIO\n" - " pin is the index of the pin, i.e. PA4 is 5 [(port * 32) + pin]\n" - " handshake = 1 to enable handshaking, provide ctspin, rtspin (UNSUPPORTED)\n" - " handshake = 0 to disable handshaking, do not provide ctspin, rtspin\n" - " Ex: ports=UARTTIO,57600,7,6,0,9600,8,9,0\n"); -MODULE_AUTHOR("Patrick Tjin <pat.tjin@ubicom.com>"); -MODULE_DESCRIPTION("Ubicom serial virtual peripherial driver"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS_CHARDEV_MAJOR(UBI32_UARTTIO_MAJOR); -MODULE_ALIAS("platform:" DRIVER_NAME); |