diff options
Diffstat (limited to 'drivers/serial/21285.c')
| -rw-r--r-- | drivers/serial/21285.c | 513 |
1 files changed, 0 insertions, 513 deletions
diff --git a/drivers/serial/21285.c b/drivers/serial/21285.c deleted file mode 100644 index d89aa38c5cf0..000000000000 --- a/drivers/serial/21285.c +++ /dev/null @@ -1,513 +0,0 @@ -/* - * linux/drivers/serial/21285.c - * - * Driver for the serial port on the 21285 StrongArm-110 core logic chip. - * - * Based on drivers/char/serial.c - */ -#include <linux/module.h> -#include <linux/tty.h> -#include <linux/ioport.h> -#include <linux/init.h> -#include <linux/console.h> -#include <linux/device.h> -#include <linux/tty_flip.h> -#include <linux/serial_core.h> -#include <linux/serial.h> -#include <linux/io.h> - -#include <asm/irq.h> -#include <asm/mach-types.h> -#include <asm/hardware/dec21285.h> -#include <mach/hardware.h> - -#define BAUD_BASE (mem_fclk_21285/64) - -#define SERIAL_21285_NAME "ttyFB" -#define SERIAL_21285_MAJOR 204 -#define SERIAL_21285_MINOR 4 - -#define RXSTAT_DUMMY_READ 0x80000000 -#define RXSTAT_FRAME (1 << 0) -#define RXSTAT_PARITY (1 << 1) -#define RXSTAT_OVERRUN (1 << 2) -#define RXSTAT_ANYERR (RXSTAT_FRAME|RXSTAT_PARITY|RXSTAT_OVERRUN) - -#define H_UBRLCR_BREAK (1 << 0) -#define H_UBRLCR_PARENB (1 << 1) -#define H_UBRLCR_PAREVN (1 << 2) -#define H_UBRLCR_STOPB (1 << 3) -#define H_UBRLCR_FIFO (1 << 4) - -static const char serial21285_name[] = "Footbridge UART"; - -#define tx_enabled(port) ((port)->unused[0]) -#define rx_enabled(port) ((port)->unused[1]) - -/* - * The documented expression for selecting the divisor is: - * BAUD_BASE / baud - 1 - * However, typically BAUD_BASE is not divisible by baud, so - * we want to select the divisor that gives us the minimum - * error. Therefore, we want: - * int(BAUD_BASE / baud - 0.5) -> - * int(BAUD_BASE / baud - (baud >> 1) / baud) -> - * int((BAUD_BASE - (baud >> 1)) / baud) - */ - -static void serial21285_stop_tx(struct uart_port *port) -{ - if (tx_enabled(port)) { - disable_irq_nosync(IRQ_CONTX); - tx_enabled(port) = 0; - } -} - -static void serial21285_start_tx(struct uart_port *port) -{ - if (!tx_enabled(port)) { - enable_irq(IRQ_CONTX); - tx_enabled(port) = 1; - } -} - -static void serial21285_stop_rx(struct uart_port *port) -{ - if (rx_enabled(port)) { - disable_irq_nosync(IRQ_CONRX); - rx_enabled(port) = 0; - } -} - -static void serial21285_enable_ms(struct uart_port *port) -{ -} - -static irqreturn_t serial21285_rx_chars(int irq, void *dev_id) -{ - struct uart_port *port = dev_id; - struct tty_struct *tty = port->state->port.tty; - unsigned int status, ch, flag, rxs, max_count = 256; - - status = *CSR_UARTFLG; - while (!(status & 0x10) && max_count--) { - ch = *CSR_UARTDR; - flag = TTY_NORMAL; - port->icount.rx++; - - rxs = *CSR_RXSTAT | RXSTAT_DUMMY_READ; - if (unlikely(rxs & RXSTAT_ANYERR)) { - if (rxs & RXSTAT_PARITY) - port->icount.parity++; - else if (rxs & RXSTAT_FRAME) - port->icount.frame++; - if (rxs & RXSTAT_OVERRUN) - port->icount.overrun++; - - rxs &= port->read_status_mask; - - if (rxs & RXSTAT_PARITY) - flag = TTY_PARITY; - else if (rxs & RXSTAT_FRAME) - flag = TTY_FRAME; - } - - uart_insert_char(port, rxs, RXSTAT_OVERRUN, ch, flag); - - status = *CSR_UARTFLG; - } - tty_flip_buffer_push(tty); - - return IRQ_HANDLED; -} - -static irqreturn_t serial21285_tx_chars(int irq, void *dev_id) -{ - struct uart_port *port = dev_id; - struct circ_buf *xmit = &port->state->xmit; - int count = 256; - - if (port->x_char) { - *CSR_UARTDR = port->x_char; - port->icount.tx++; - port->x_char = 0; - goto out; - } - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { - serial21285_stop_tx(port); - goto out; - } - - do { - *CSR_UARTDR = xmit->buf[xmit->tail]; - xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); - port->icount.tx++; - if (uart_circ_empty(xmit)) - break; - } while (--count > 0 && !(*CSR_UARTFLG & 0x20)); - - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) - uart_write_wakeup(port); - - if (uart_circ_empty(xmit)) - serial21285_stop_tx(port); - - out: - return IRQ_HANDLED; -} - -static unsigned int serial21285_tx_empty(struct uart_port *port) -{ - return (*CSR_UARTFLG & 8) ? 0 : TIOCSER_TEMT; -} - -/* no modem control lines */ -static unsigned int serial21285_get_mctrl(struct uart_port *port) -{ - return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS; -} - -static void serial21285_set_mctrl(struct uart_port *port, unsigned int mctrl) -{ -} - -static void serial21285_break_ctl(struct uart_port *port, int break_state) -{ - unsigned long flags; - unsigned int h_lcr; - - spin_lock_irqsave(&port->lock, flags); - h_lcr = *CSR_H_UBRLCR; - if (break_state) - h_lcr |= H_UBRLCR_BREAK; - else - h_lcr &= ~H_UBRLCR_BREAK; - *CSR_H_UBRLCR = h_lcr; - spin_unlock_irqrestore(&port->lock, flags); -} - -static int serial21285_startup(struct uart_port *port) -{ - int ret; - - tx_enabled(port) = 1; - rx_enabled(port) = 1; - - ret = request_irq(IRQ_CONRX, serial21285_rx_chars, 0, - serial21285_name, port); - if (ret == 0) { - ret = request_irq(IRQ_CONTX, serial21285_tx_chars, 0, - serial21285_name, port); - if (ret) - free_irq(IRQ_CONRX, port); - } - - return ret; -} - -static void serial21285_shutdown(struct uart_port *port) -{ - free_irq(IRQ_CONTX, port); - free_irq(IRQ_CONRX, port); -} - -static void -serial21285_set_termios(struct uart_port *port, struct ktermios *termios, - struct ktermios *old) -{ - unsigned long flags; - unsigned int baud, quot, h_lcr, b; - - /* - * We don't support modem control lines. - */ - termios->c_cflag &= ~(HUPCL | CRTSCTS | CMSPAR); - termios->c_cflag |= CLOCAL; - - /* - * We don't support BREAK character recognition. - */ - termios->c_iflag &= ~(IGNBRK | BRKINT); - - /* - * Ask the core to calculate the divisor for us. - */ - baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); - quot = uart_get_divisor(port, baud); - b = port->uartclk / (16 * quot); - tty_termios_encode_baud_rate(termios, b, b); - - switch (termios->c_cflag & CSIZE) { - case CS5: - h_lcr = 0x00; - break; - case CS6: - h_lcr = 0x20; - break; - case CS7: - h_lcr = 0x40; - break; - default: /* CS8 */ - h_lcr = 0x60; - break; - } - - if (termios->c_cflag & CSTOPB) - h_lcr |= H_UBRLCR_STOPB; - if (termios->c_cflag & PARENB) { - h_lcr |= H_UBRLCR_PARENB; - if (!(termios->c_cflag & PARODD)) - h_lcr |= H_UBRLCR_PAREVN; - } - - if (port->fifosize) - h_lcr |= H_UBRLCR_FIFO; - - spin_lock_irqsave(&port->lock, flags); - - /* - * Update the per-port timeout. - */ - uart_update_timeout(port, termios->c_cflag, baud); - - /* - * Which character status flags are we interested in? - */ - port->read_status_mask = RXSTAT_OVERRUN; - if (termios->c_iflag & INPCK) - port->read_status_mask |= RXSTAT_FRAME | RXSTAT_PARITY; - - /* - * Which character status flags should we ignore? - */ - port->ignore_status_mask = 0; - if (termios->c_iflag & IGNPAR) - port->ignore_status_mask |= RXSTAT_FRAME | RXSTAT_PARITY; - if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR) - port->ignore_status_mask |= RXSTAT_OVERRUN; - - /* - * Ignore all characters if CREAD is not set. - */ - if ((termios->c_cflag & CREAD) == 0) - port->ignore_status_mask |= RXSTAT_DUMMY_READ; - - quot -= 1; - - *CSR_UARTCON = 0; - *CSR_L_UBRLCR = quot & 0xff; - *CSR_M_UBRLCR = (quot >> 8) & 0x0f; - *CSR_H_UBRLCR = h_lcr; - *CSR_UARTCON = 1; - - spin_unlock_irqrestore(&port->lock, flags); -} - -static const char *serial21285_type(struct uart_port *port) -{ - return port->type == PORT_21285 ? "DC21285" : NULL; -} - -static void serial21285_release_port(struct uart_port *port) -{ - release_mem_region(port->mapbase, 32); -} - -static int serial21285_request_port(struct uart_port *port) -{ - return request_mem_region(port->mapbase, 32, serial21285_name) - != NULL ? 0 : -EBUSY; -} - -static void serial21285_config_port(struct uart_port *port, int flags) -{ - if (flags & UART_CONFIG_TYPE && serial21285_request_port(port) == 0) - port->type = PORT_21285; -} - -/* - * verify the new serial_struct (for TIOCSSERIAL). - */ -static int serial21285_verify_port(struct uart_port *port, struct serial_struct *ser) -{ - int ret = 0; - if (ser->type != PORT_UNKNOWN && ser->type != PORT_21285) - ret = -EINVAL; - if (ser->irq != NO_IRQ) - ret = -EINVAL; - if (ser->baud_base != port->uartclk / 16) - ret = -EINVAL; - return ret; -} - -static struct uart_ops serial21285_ops = { - .tx_empty = serial21285_tx_empty, - .get_mctrl = serial21285_get_mctrl, - .set_mctrl = serial21285_set_mctrl, - .stop_tx = serial21285_stop_tx, - .start_tx = serial21285_start_tx, - .stop_rx = serial21285_stop_rx, - .enable_ms = serial21285_enable_ms, - .break_ctl = serial21285_break_ctl, - .startup = serial21285_startup, - .shutdown = serial21285_shutdown, - .set_termios = serial21285_set_termios, - .type = serial21285_type, - .release_port = serial21285_release_port, - .request_port = serial21285_request_port, - .config_port = serial21285_config_port, - .verify_port = serial21285_verify_port, -}; - -static struct uart_port serial21285_port = { - .mapbase = 0x42000160, - .iotype = UPIO_MEM, - .irq = NO_IRQ, - .fifosize = 16, - .ops = &serial21285_ops, - .flags = UPF_BOOT_AUTOCONF, -}; - -static void serial21285_setup_ports(void) -{ - serial21285_port.uartclk = mem_fclk_21285 / 4; -} - -#ifdef CONFIG_SERIAL_21285_CONSOLE -static void serial21285_console_putchar(struct uart_port *port, int ch) -{ - while (*CSR_UARTFLG & 0x20) - barrier(); - *CSR_UARTDR = ch; -} - -static void -serial21285_console_write(struct console *co, const char *s, - unsigned int count) -{ - uart_console_write(&serial21285_port, s, count, serial21285_console_putchar); -} - -static void __init -serial21285_get_options(struct uart_port *port, int *baud, - int *parity, int *bits) -{ - if (*CSR_UARTCON == 1) { - unsigned int tmp; - - tmp = *CSR_H_UBRLCR; - switch (tmp & 0x60) { - case 0x00: - *bits = 5; - break; - case 0x20: - *bits = 6; - break; - case 0x40: - *bits = 7; - break; - default: - case 0x60: - *bits = 8; - break; - } - - if (tmp & H_UBRLCR_PARENB) { - *parity = 'o'; - if (tmp & H_UBRLCR_PAREVN) - *parity = 'e'; - } - - tmp = *CSR_L_UBRLCR | (*CSR_M_UBRLCR << 8); - - *baud = port->uartclk / (16 * (tmp + 1)); - } -} - -static int __init serial21285_console_setup(struct console *co, char *options) -{ - struct uart_port *port = &serial21285_port; - int baud = 9600; - int bits = 8; - int parity = 'n'; - int flow = 'n'; - - if (machine_is_personal_server()) - baud = 57600; - - /* - * Check whether an invalid uart number has been specified, and - * if so, search for the first available port that does have - * console support. - */ - if (options) - uart_parse_options(options, &baud, &parity, &bits, &flow); - else - serial21285_get_options(port, &baud, &parity, &bits); - - return uart_set_options(port, co, baud, parity, bits, flow); -} - -static struct uart_driver serial21285_reg; - -static struct console serial21285_console = -{ - .name = SERIAL_21285_NAME, - .write = serial21285_console_write, - .device = uart_console_device, - .setup = serial21285_console_setup, - .flags = CON_PRINTBUFFER, - .index = -1, - .data = &serial21285_reg, -}; - -static int __init rs285_console_init(void) -{ - serial21285_setup_ports(); - register_console(&serial21285_console); - return 0; -} -console_initcall(rs285_console_init); - -#define SERIAL_21285_CONSOLE &serial21285_console -#else -#define SERIAL_21285_CONSOLE NULL -#endif - -static struct uart_driver serial21285_reg = { - .owner = THIS_MODULE, - .driver_name = "ttyFB", - .dev_name = "ttyFB", - .major = SERIAL_21285_MAJOR, - .minor = SERIAL_21285_MINOR, - .nr = 1, - .cons = SERIAL_21285_CONSOLE, -}; - -static int __init serial21285_init(void) -{ - int ret; - - printk(KERN_INFO "Serial: 21285 driver\n"); - - serial21285_setup_ports(); - - ret = uart_register_driver(&serial21285_reg); - if (ret == 0) - uart_add_one_port(&serial21285_reg, &serial21285_port); - - return ret; -} - -static void __exit serial21285_exit(void) -{ - uart_remove_one_port(&serial21285_reg, &serial21285_port); - uart_unregister_driver(&serial21285_reg); -} - -module_init(serial21285_init); -module_exit(serial21285_exit); - -MODULE_LICENSE("GPL"); -MODULE_DESCRIPTION("Intel Footbridge (21285) serial driver"); -MODULE_ALIAS_CHARDEV(SERIAL_21285_MAJOR, SERIAL_21285_MINOR); |