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, 1172 insertions, 0 deletions
diff --git a/target/linux/ubicom32/files/drivers/serial/ubi32_uarttio.c b/target/linux/ubicom32/files/drivers/serial/ubi32_uarttio.c new file mode 100644 index 000000000..7aa374200 --- /dev/null +++ b/target/linux/ubicom32/files/drivers/serial/ubi32_uarttio.c @@ -0,0 +1,1172 @@ +/* + * 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); |