diff options
Diffstat (limited to 'drivers/serial/dz.c')
| -rw-r--r-- | drivers/serial/dz.c | 822 |
1 files changed, 0 insertions, 822 deletions
diff --git a/drivers/serial/dz.c b/drivers/serial/dz.c deleted file mode 100644 index e63b9dffc8d..00000000000 --- a/drivers/serial/dz.c +++ /dev/null @@ -1,822 +0,0 @@ -/* - * dz.c: Serial port driver for DECStations equiped - * with the DZ chipset. - * - * Copyright (C) 1998 Olivier A. D. Lebaillif - * - * Email: olivier.lebaillif@ifrsys.com - * - * [31-AUG-98] triemer - * Changed IRQ to use Harald's dec internals interrupts.h - * removed base_addr code - moving address assignment to setup.c - * Changed name of dz_init to rs_init to be consistent with tc code - * [13-NOV-98] triemer fixed code to receive characters - * after patches by harald to irq code. - * [09-JAN-99] triemer minor fix for schedule - due to removal of timeout - * field from "current" - somewhere between 2.1.121 and 2.1.131 - Qua Jun 27 15:02:26 BRT 2001 - * [27-JUN-2001] Arnaldo Carvalho de Melo <acme@conectiva.com.br> - cleanups - * - * Parts (C) 1999 David Airlie, airlied@linux.ie - * [07-SEP-99] Bugfixes - * - * [06-Jan-2002] Russell King <rmk@arm.linux.org.uk> - * Converted to new serial core - */ - -#undef DEBUG_DZ - -#include <linux/config.h> -#include <linux/module.h> -#include <linux/interrupt.h> -#include <linux/init.h> -#include <linux/console.h> -#include <linux/tty.h> -#include <linux/tty_flip.h> -#include <linux/serial_core.h> -#include <linux/serial.h> - -#include <asm/bootinfo.h> -#include <asm/dec/interrupts.h> -#include <asm/dec/kn01.h> -#include <asm/dec/kn02.h> -#include <asm/dec/machtype.h> -#include <asm/dec/prom.h> -#include <asm/irq.h> -#include <asm/system.h> -#include <asm/uaccess.h> - -#define CONSOLE_LINE (3) /* for definition of struct console */ - -#include "dz.h" - -#define DZ_INTR_DEBUG 1 - -static char *dz_name = "DECstation DZ serial driver version "; -static char *dz_version = "1.02"; - -struct dz_port { - struct uart_port port; - unsigned int cflag; -}; - -static struct dz_port dz_ports[DZ_NB_PORT]; - -#ifdef DEBUG_DZ -/* - * debugging code to send out chars via prom - */ -static void debug_console(const char *s, int count) -{ - unsigned i; - - for (i = 0; i < count; i++) { - if (*s == 10) - prom_printf("%c", 13); - prom_printf("%c", *s++); - } -} -#endif - -/* - * ------------------------------------------------------------ - * dz_in () and dz_out () - * - * These routines are used to access the registers of the DZ - * chip, hiding relocation differences between implementation. - * ------------------------------------------------------------ - */ - -static inline unsigned short dz_in(struct dz_port *dport, unsigned offset) -{ - volatile unsigned short *addr = - (volatile unsigned short *) (dport->port.membase + offset); - return *addr; -} - -static inline void dz_out(struct dz_port *dport, unsigned offset, - unsigned short value) -{ - volatile unsigned short *addr = - (volatile unsigned short *) (dport->port.membase + offset); - *addr = value; -} - -/* - * ------------------------------------------------------------ - * rs_stop () and rs_start () - * - * These routines are called before setting or resetting - * tty->stopped. They enable or disable transmitter interrupts, - * as necessary. - * ------------------------------------------------------------ - */ - -static void dz_stop_tx(struct uart_port *uport) -{ - struct dz_port *dport = (struct dz_port *)uport; - unsigned short tmp, mask = 1 << dport->port.line; - unsigned long flags; - - spin_lock_irqsave(&dport->port.lock, flags); - tmp = dz_in(dport, DZ_TCR); /* read the TX flag */ - tmp &= ~mask; /* clear the TX flag */ - dz_out(dport, DZ_TCR, tmp); - spin_unlock_irqrestore(&dport->port.lock, flags); -} - -static void dz_start_tx(struct uart_port *uport) -{ - struct dz_port *dport = (struct dz_port *)uport; - unsigned short tmp, mask = 1 << dport->port.line; - unsigned long flags; - - spin_lock_irqsave(&dport->port.lock, flags); - tmp = dz_in(dport, DZ_TCR); /* read the TX flag */ - tmp |= mask; /* set the TX flag */ - dz_out(dport, DZ_TCR, tmp); - spin_unlock_irqrestore(&dport->port.lock, flags); -} - -static void dz_stop_rx(struct uart_port *uport) -{ - struct dz_port *dport = (struct dz_port *)uport; - unsigned long flags; - - spin_lock_irqsave(&dport->port.lock, flags); - dport->cflag &= ~DZ_CREAD; - dz_out(dport, DZ_LPR, dport->cflag); - spin_unlock_irqrestore(&dport->port.lock, flags); -} - -static void dz_enable_ms(struct uart_port *port) -{ - /* nothing to do */ -} - -/* - * ------------------------------------------------------------ - * Here starts the interrupt handling routines. All of the - * following subroutines are declared as inline and are folded - * into dz_interrupt. They were separated out for readability's - * sake. - * - * Note: rs_interrupt() is a "fast" interrupt, which means that it - * runs with interrupts turned off. People who may want to modify - * rs_interrupt() should try to keep the interrupt handler as fast as - * possible. After you are done making modifications, it is not a bad - * idea to do: - * - * make drivers/serial/dz.s - * - * and look at the resulting assemble code in dz.s. - * - * ------------------------------------------------------------ - */ - -/* - * ------------------------------------------------------------ - * receive_char () - * - * This routine deals with inputs from any lines. - * ------------------------------------------------------------ - */ -static inline void dz_receive_chars(struct dz_port *dport) -{ - struct tty_struct *tty = NULL; - struct uart_icount *icount; - int ignore = 0; - unsigned short status, tmp; - unsigned char ch, flag; - - /* this code is going to be a problem... - the call to tty_flip_buffer is going to need - to be rethought... - */ - do { - status = dz_in(dport, DZ_RBUF); - - /* punt so we don't get duplicate characters */ - if (!(status & DZ_DVAL)) - goto ignore_char; - - - ch = UCHAR(status); /* grab the char */ - flag = TTY_NORMAL; - -#if 0 - if (info->is_console) { - if (ch == 0) - return; /* it's a break ... */ - } -#endif - - tty = dport->port.info->tty;/* now tty points to the proper dev */ - icount = &dport->port.icount; - - if (!tty) - break; - if (tty->flip.count >= TTY_FLIPBUF_SIZE) - break; - - icount->rx++; - - /* keep track of the statistics */ - if (status & (DZ_OERR | DZ_FERR | DZ_PERR)) { - if (status & DZ_PERR) /* parity error */ - icount->parity++; - else if (status & DZ_FERR) /* frame error */ - icount->frame++; - if (status & DZ_OERR) /* overrun error */ - icount->overrun++; - - /* check to see if we should ignore the character - and mask off conditions that should be ignored - */ - - if (status & dport->port.ignore_status_mask) { - if (++ignore > 100) - break; - goto ignore_char; - } - /* mask off the error conditions we want to ignore */ - tmp = status & dport->port.read_status_mask; - - if (tmp & DZ_PERR) { - flag = TTY_PARITY; -#ifdef DEBUG_DZ - debug_console("PERR\n", 5); -#endif - } else if (tmp & DZ_FERR) { - flag = TTY_FRAME; -#ifdef DEBUG_DZ - debug_console("FERR\n", 5); -#endif - } - if (tmp & DZ_OERR) { -#ifdef DEBUG_DZ - debug_console("OERR\n", 5); -#endif - tty_insert_flip_char(tty, ch, flag); - ch = 0; - flag = TTY_OVERRUN; - } - } - tty_insert_flip_char(tty, ch, flag); - ignore_char: - } while (status & DZ_DVAL); - - if (tty) - tty_flip_buffer_push(tty); -} - -/* - * ------------------------------------------------------------ - * transmit_char () - * - * This routine deals with outputs to any lines. - * ------------------------------------------------------------ - */ -static inline void dz_transmit_chars(struct dz_port *dport) -{ - struct circ_buf *xmit = &dport->port.info->xmit; - unsigned char tmp; - - if (dport->port.x_char) { /* XON/XOFF chars */ - dz_out(dport, DZ_TDR, dport->port.x_char); - dport->port.icount.tx++; - dport->port.x_char = 0; - return; - } - /* if nothing to do or stopped or hardware stopped */ - if (uart_circ_empty(xmit) || uart_tx_stopped(&dport->port)) { - dz_stop_tx(&dport->port); - return; - } - - /* - * if something to do ... (rember the dz has no output fifo so we go - * one char at a time :-< - */ - tmp = xmit->buf[xmit->tail]; - xmit->tail = (xmit->tail + 1) & (DZ_XMIT_SIZE - 1); - dz_out(dport, DZ_TDR, tmp); - dport->port.icount.tx++; - - if (uart_circ_chars_pending(xmit) < DZ_WAKEUP_CHARS) - uart_write_wakeup(&dport->port); - - /* Are we done */ - if (uart_circ_empty(xmit)) - dz_stop_tx(&dport->port); -} - -/* - * ------------------------------------------------------------ - * check_modem_status () - * - * Only valid for the MODEM line duh ! - * ------------------------------------------------------------ - */ -static inline void check_modem_status(struct dz_port *dport) -{ - unsigned short status; - - /* if not ne modem line just return */ - if (dport->port.line != DZ_MODEM) - return; - - status = dz_in(dport, DZ_MSR); - - /* it's easy, since DSR2 is the only bit in the register */ - if (status) - dport->port.icount.dsr++; -} - -/* - * ------------------------------------------------------------ - * dz_interrupt () - * - * this is the main interrupt routine for the DZ chip. - * It deals with the multiple ports. - * ------------------------------------------------------------ - */ -static irqreturn_t dz_interrupt(int irq, void *dev, struct pt_regs *regs) -{ - struct dz_port *dport; - unsigned short status; - - /* get the reason why we just got an irq */ - status = dz_in((struct dz_port *)dev, DZ_CSR); - dport = &dz_ports[LINE(status)]; - - if (status & DZ_RDONE) - dz_receive_chars(dport); - - if (status & DZ_TRDY) - dz_transmit_chars(dport); - - /* FIXME: what about check modem status??? --rmk */ - - return IRQ_HANDLED; -} - -/* - * ------------------------------------------------------------------- - * Here ends the DZ interrupt routines. - * ------------------------------------------------------------------- - */ - -static unsigned int dz_get_mctrl(struct uart_port *uport) -{ - struct dz_port *dport = (struct dz_port *)uport; - unsigned int mctrl = TIOCM_CAR | TIOCM_DSR | TIOCM_CTS; - - if (dport->port.line == DZ_MODEM) { - /* - * CHECKME: This is a guess from the other code... --rmk - */ - if (dz_in(dport, DZ_MSR) & DZ_MODEM_DSR) - mctrl &= ~TIOCM_DSR; - } - - return mctrl; -} - -static void dz_set_mctrl(struct uart_port *uport, unsigned int mctrl) -{ - struct dz_port *dport = (struct dz_port *)uport; - unsigned short tmp; - - if (dport->port.line == DZ_MODEM) { - tmp = dz_in(dport, DZ_TCR); - if (mctrl & TIOCM_DTR) - tmp &= ~DZ_MODEM_DTR; - else - tmp |= DZ_MODEM_DTR; - dz_out(dport, DZ_TCR, tmp); - } -} - -/* - * ------------------------------------------------------------------- - * startup () - * - * various initialization tasks - * ------------------------------------------------------------------- - */ -static int dz_startup(struct uart_port *uport) -{ - struct dz_port *dport = (struct dz_port *)uport; - unsigned long flags; - unsigned short tmp; - - /* The dz lines for the mouse/keyboard must be - * opened using their respective drivers. - */ - if ((dport->port.line == DZ_KEYBOARD) || - (dport->port.line == DZ_MOUSE)) - return -ENODEV; - - spin_lock_irqsave(&dport->port.lock, flags); - - /* enable the interrupt and the scanning */ - tmp = dz_in(dport, DZ_CSR); - tmp |= DZ_RIE | DZ_TIE | DZ_MSE; - dz_out(dport, DZ_CSR, tmp); - - spin_unlock_irqrestore(&dport->port.lock, flags); - - return 0; -} - -/* - * ------------------------------------------------------------------- - * shutdown () - * - * This routine will shutdown a serial port; interrupts are disabled, and - * DTR is dropped if the hangup on close termio flag is on. - * ------------------------------------------------------------------- - */ -static void dz_shutdown(struct uart_port *uport) -{ - dz_stop_tx(uport); -} - -/* - * get_lsr_info - get line status register info - * - * Purpose: Let user call ioctl() to get info when the UART physically - * is emptied. On bus types like RS485, the transmitter must - * release the bus after transmitting. This must be done when - * the transmit shift register is empty, not be done when the - * transmit holding register is empty. This functionality - * allows an RS485 driver to be written in user space. - */ -static unsigned int dz_tx_empty(struct uart_port *uport) -{ - struct dz_port *dport = (struct dz_port *)uport; - unsigned short status = dz_in(dport, DZ_LPR); - - /* FIXME: this appears to be obviously broken --rmk. */ - return status ? TIOCSER_TEMT : 0; -} - -static void dz_break_ctl(struct uart_port *uport, int break_state) -{ - struct dz_port *dport = (struct dz_port *)uport; - unsigned long flags; - unsigned short tmp, mask = 1 << uport->line; - - spin_lock_irqsave(&uport->lock, flags); - tmp = dz_in(dport, DZ_TCR); - if (break_state) - tmp |= mask; - else - tmp &= ~mask; - dz_out(dport, DZ_TCR, tmp); - spin_unlock_irqrestore(&uport->lock, flags); -} - -static void dz_set_termios(struct uart_port *uport, struct termios *termios, - struct termios *old_termios) -{ - struct dz_port *dport = (struct dz_port *)uport; - unsigned long flags; - unsigned int cflag, baud; - - cflag = dport->port.line; - - switch (termios->c_cflag & CSIZE) { - case CS5: - cflag |= DZ_CS5; - break; - case CS6: - cflag |= DZ_CS6; - break; - case CS7: - cflag |= DZ_CS7; - break; - case CS8: - default: - cflag |= DZ_CS8; - } - - if (termios->c_cflag & CSTOPB) - cflag |= DZ_CSTOPB; - if (termios->c_cflag & PARENB) - cflag |= DZ_PARENB; - if (termios->c_cflag & PARODD) - cflag |= DZ_PARODD; - - baud = uart_get_baud_rate(uport, termios, old_termios, 50, 9600); - switch (baud) { - case 50: - cflag |= DZ_B50; - break; - case 75: - cflag |= DZ_B75; - break; - case 110: - cflag |= DZ_B110; - break; - case 134: - cflag |= DZ_B134; - break; - case 150: - cflag |= DZ_B150; - break; - case 300: - cflag |= DZ_B300; - break; - case 600: - cflag |= DZ_B600; - break; - case 1200: - cflag |= DZ_B1200; - break; - case 1800: - cflag |= DZ_B1800; - break; - case 2000: - cflag |= DZ_B2000; - break; - case 2400: - cflag |= DZ_B2400; - break; - case 3600: - cflag |= DZ_B3600; - break; - case 4800: - cflag |= DZ_B4800; - break; - case 7200: - cflag |= DZ_B7200; - break; - case 9600: - default: - cflag |= DZ_B9600; - } - - if (termios->c_cflag & CREAD) - cflag |= DZ_RXENAB; - - spin_lock_irqsave(&dport->port.lock, flags); - - dz_out(dport, DZ_LPR, cflag); - dport->cflag = cflag; - - /* setup accept flag */ - dport->port.read_status_mask = DZ_OERR; - if (termios->c_iflag & INPCK) - dport->port.read_status_mask |= DZ_FERR | DZ_PERR; - - /* characters to ignore */ - uport->ignore_status_mask = 0; - if (termios->c_iflag & IGNPAR) - dport->port.ignore_status_mask |= DZ_FERR | DZ_PERR; - - spin_unlock_irqrestore(&dport->port.lock, flags); -} - -static const char *dz_type(struct uart_port *port) -{ - return "DZ"; -} - -static void dz_release_port(struct uart_port *port) -{ - /* nothing to do */ -} - -static int dz_request_port(struct uart_port *port) -{ - return 0; -} - -static void dz_config_port(struct uart_port *port, int flags) -{ - if (flags & UART_CONFIG_TYPE) - port->type = PORT_DZ; -} - -/* - * verify the new serial_struct (for TIOCSSERIAL). - */ -static int dz_verify_port(struct uart_port *port, struct serial_struct *ser) -{ - int ret = 0; - if (ser->type != PORT_UNKNOWN && ser->type != PORT_DZ) - ret = -EINVAL; - if (ser->irq != port->irq) - ret = -EINVAL; - return ret; -} - -static struct uart_ops dz_ops = { - .tx_empty = dz_tx_empty, - .get_mctrl = dz_get_mctrl, - .set_mctrl = dz_set_mctrl, - .stop_tx = dz_stop_tx, - .start_tx = dz_start_tx, - .stop_rx = dz_stop_rx, - .enable_ms = dz_enable_ms, - .break_ctl = dz_break_ctl, - .startup = dz_startup, - .shutdown = dz_shutdown, - .set_termios = dz_set_termios, - .type = dz_type, - .release_port = dz_release_port, - .request_port = dz_request_port, - .config_port = dz_config_port, - .verify_port = dz_verify_port, -}; - -static void __init dz_init_ports(void) -{ - static int first = 1; - struct dz_port *dport; - unsigned long base; - int i; - - if (!first) - return; - first = 0; - - if (mips_machtype == MACH_DS23100 || - mips_machtype == MACH_DS5100) - base = (unsigned long) KN01_DZ11_BASE; - else - base = (unsigned long) KN02_DZ11_BASE; - - for (i = 0, dport = dz_ports; i < DZ_NB_PORT; i++, dport++) { - spin_lock_init(&dport->port.lock); - dport->port.membase = (char *) base; - dport->port.iotype = SERIAL_IO_PORT; - dport->port.irq = dec_interrupt[DEC_IRQ_DZ11]; - dport->port.line = i; - dport->port.fifosize = 1; - dport->port.ops = &dz_ops; - dport->port.flags = UPF_BOOT_AUTOCONF; - } -} - -static void dz_reset(struct dz_port *dport) -{ - dz_out(dport, DZ_CSR, DZ_CLR); - - while (dz_in(dport, DZ_CSR) & DZ_CLR); - /* FIXME: cpu_relax? */ - - iob(); - - /* enable scanning */ - dz_out(dport, DZ_CSR, DZ_MSE); -} - -#ifdef CONFIG_SERIAL_DZ_CONSOLE -static void dz_console_put_char(struct dz_port *dport, unsigned char ch) -{ - unsigned long flags; - int loops = 2500; - unsigned short tmp = ch; - /* this code sends stuff out to serial device - spinning its - wheels and waiting. */ - - spin_lock_irqsave(&dport->port.lock, flags); - - /* spin our wheels */ - while (((dz_in(dport, DZ_CSR) & DZ_TRDY) != DZ_TRDY) && loops--) - /* FIXME: cpu_relax, udelay? --rmk */ - ; - - /* Actually transmit the character. */ - dz_out(dport, DZ_TDR, tmp); - - spin_unlock_irqrestore(&dport->port.lock, flags); -} -/* - * ------------------------------------------------------------------- - * dz_console_print () - * - * dz_console_print is registered for printk. - * The console must be locked when we get here. - * ------------------------------------------------------------------- - */ -static void dz_console_print(struct console *cons, - const char *str, - unsigned int count) -{ - struct dz_port *dport = &dz_ports[CONSOLE_LINE]; -#ifdef DEBUG_DZ - prom_printf((char *) str); -#endif - while (count--) { - if (*str == '\n') - dz_console_put_char(dport, '\r'); - dz_console_put_char(dport, *str++); - } -} - -static int __init dz_console_setup(struct console *co, char *options) -{ - struct dz_port *dport = &dz_ports[CONSOLE_LINE]; - int baud = 9600; - int bits = 8; - int parity = 'n'; - int flow = 'n'; - int ret; - unsigned short mask, tmp; - - if (options) - uart_parse_options(options, &baud, &parity, &bits, &flow); - - dz_reset(dport); - - ret = uart_set_options(&dport->port, co, baud, parity, bits, flow); - if (ret == 0) { - mask = 1 << dport->port.line; - tmp = dz_in(dport, DZ_TCR); /* read the TX flag */ - if (!(tmp & mask)) { - tmp |= mask; /* set the TX flag */ - dz_out(dport, DZ_TCR, tmp); - } - } - - return ret; -} - -static struct console dz_sercons = -{ - .name = "ttyS", - .write = dz_console_print, - .device = uart_console_device, - .setup = dz_console_setup, - .flags = CON_CONSDEV | CON_PRINTBUFFER, - .index = CONSOLE_LINE, -}; - -void __init dz_serial_console_init(void) -{ - dz_init_ports(); - - register_console(&dz_sercons); -} - -#define SERIAL_DZ_CONSOLE &dz_sercons -#else -#define SERIAL_DZ_CONSOLE NULL -#endif /* CONFIG_SERIAL_DZ_CONSOLE */ - -static struct uart_driver dz_reg = { - .owner = THIS_MODULE, - .driver_name = "serial", -#ifdef CONFIG_DEVFS - .dev_name = "tts/%d", -#else - .dev_name = "ttyS%d", -#endif - .major = TTY_MAJOR, - .minor = 64, - .nr = DZ_NB_PORT, - .cons = SERIAL_DZ_CONSOLE, -}; - -int __init dz_init(void) -{ - unsigned long flags; - int ret, i; - - printk("%s%s\n", dz_name, dz_version); - - dz_init_ports(); - - save_flags(flags); - cli(); - -#ifndef CONFIG_SERIAL_DZ_CONSOLE - /* reset the chip */ - dz_reset(&dz_ports[0]); -#endif - - /* order matters here... the trick is that flags - is updated... in request_irq - to immediatedly obliterate - it is unwise. */ - restore_flags(flags); - - if (request_irq(dz_ports[0].port.irq, dz_interrupt, - SA_INTERRUPT, "DZ", &dz_ports[0])) - panic("Unable to register DZ interrupt"); - - ret = uart_register_driver(&dz_reg); - if (ret != 0) - return ret; - - for (i = 0; i < DZ_NB_PORT; i++) - uart_add_one_port(&dz_reg, &dz_ports[i].port); - - return ret; -} - -MODULE_DESCRIPTION("DECstation DZ serial driver"); -MODULE_LICENSE("GPL"); |