diff options
Diffstat (limited to 'drivers/serial/dz.c')
| -rw-r--r-- | drivers/serial/dz.c | 371 |
1 files changed, 186 insertions, 185 deletions
diff --git a/drivers/serial/dz.c b/drivers/serial/dz.c index 53662b3..af1544f 100644 --- a/drivers/serial/dz.c +++ b/drivers/serial/dz.c @@ -1,11 +1,13 @@ /* - * dz.c: Serial port driver for DECStations equiped + * dz.c: Serial port driver for DECstations equipped * with the DZ chipset. * * Copyright (C) 1998 Olivier A. D. Lebaillif * * Email: olivier.lebaillif@ifrsys.com * + * Copyright (C) 2004, 2006 Maciej W. Rozycki + * * [31-AUG-98] triemer * Changed IRQ to use Harald's dec internals interrupts.h * removed base_addr code - moving address assignment to setup.c @@ -26,10 +28,16 @@ #undef DEBUG_DZ +#if defined(CONFIG_SERIAL_DZ_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) +#define SUPPORT_SYSRQ +#endif + +#include <linux/delay.h> #include <linux/module.h> #include <linux/interrupt.h> #include <linux/init.h> #include <linux/console.h> +#include <linux/sysrq.h> #include <linux/tty.h> #include <linux/tty_flip.h> #include <linux/serial_core.h> @@ -45,14 +53,10 @@ #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"; +static char *dz_version = "1.03"; struct dz_port { struct uart_port port; @@ -61,22 +65,6 @@ struct dz_port { 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 () @@ -90,6 +78,7 @@ 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; } @@ -98,6 +87,7 @@ static inline void dz_out(struct dz_port *dport, unsigned offset, { volatile unsigned short *addr = (volatile unsigned short *) (dport->port.membase + offset); + *addr = value; } @@ -144,7 +134,7 @@ static void dz_stop_rx(struct uart_port *uport) spin_lock_irqsave(&dport->port.lock, flags); dport->cflag &= ~DZ_CREAD; - dz_out(dport, DZ_LPR, dport->cflag); + dz_out(dport, DZ_LPR, dport->cflag | dport->port.line); spin_unlock_irqrestore(&dport->port.lock, flags); } @@ -155,14 +145,14 @@ static void dz_enable_ms(struct uart_port *port) /* * ------------------------------------------------------------ - * 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 + * Here start 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: dz_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 + * dz_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: * @@ -180,92 +170,74 @@ static void dz_enable_ms(struct uart_port *port) * This routine deals with inputs from any lines. * ------------------------------------------------------------ */ -static inline void dz_receive_chars(struct dz_port *dport) +static inline void dz_receive_chars(struct dz_port *dport_in, + struct pt_regs *regs) { + struct dz_port *dport; struct tty_struct *tty = NULL; struct uart_icount *icount; - int ignore = 0; - unsigned short status, tmp; + int lines_rx[DZ_NB_PORT] = { [0 ... DZ_NB_PORT - 1] = 0 }; + unsigned short status; unsigned char ch, flag; + int i; - /* 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; + while ((status = dz_in(dport_in, DZ_RBUF)) & DZ_DVAL) { + dport = &dz_ports[LINE(status)]; + tty = dport->port.info->tty; /* point to the proper dev */ -#if 0 - if (info->is_console) { - if (ch == 0) - return; /* it's a break ... */ - } -#endif + ch = UCHAR(status); /* grab the char */ - tty = dport->port.info->tty;/* now tty points to the proper dev */ icount = &dport->port.icount; - - if (!tty) - 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 + flag = TTY_NORMAL; + if (status & DZ_FERR) { /* frame error */ + /* + * There is no separate BREAK status bit, so + * treat framing errors as BREAKs for Magic SysRq + * and SAK; normally, otherwise. */ - - 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) { + if (uart_handle_break(&dport->port)) + continue; + if (dport->port.flags & UPF_SAK) + flag = TTY_BREAK; + else 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; - } + } else if (status & DZ_OERR) /* overrun error */ + flag = TTY_OVERRUN; + else if (status & DZ_PERR) /* parity error */ + flag = TTY_PARITY; + + /* keep track of the statistics */ + switch (flag) { + case TTY_FRAME: + icount->frame++; + break; + case TTY_PARITY: + icount->parity++; + break; + case TTY_OVERRUN: + icount->overrun++; + break; + case TTY_BREAK: + icount->brk++; + break; + default: + break; } - tty_insert_flip_char(tty, ch, flag); - ignore_char: - ; - } while (status & DZ_DVAL); - if (tty) - tty_flip_buffer_push(tty); + if (uart_handle_sysrq_char(&dport->port, ch, regs)) + continue; + + if ((status & dport->port.ignore_status_mask) == 0) { + uart_insert_char(&dport->port, + status, DZ_OERR, ch, flag); + lines_rx[LINE(status)] = 1; + } + } + for (i = 0; i < DZ_NB_PORT; i++) + if (lines_rx[i]) + tty_flip_buffer_push(dz_ports[i].port.info->tty); } /* @@ -275,26 +247,32 @@ static inline void dz_receive_chars(struct dz_port *dport) * This routine deals with outputs to any lines. * ------------------------------------------------------------ */ -static inline void dz_transmit_chars(struct dz_port *dport) +static inline void dz_transmit_chars(struct dz_port *dport_in) { - struct circ_buf *xmit = &dport->port.info->xmit; + struct dz_port *dport; + struct circ_buf *xmit; + unsigned short status; unsigned char tmp; - if (dport->port.x_char) { /* XON/XOFF chars */ + status = dz_in(dport_in, DZ_CSR); + dport = &dz_ports[LINE(status)]; + xmit = &dport->port.info->xmit; + + 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 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 :-< + * If something to do... (remember 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); @@ -304,23 +282,29 @@ static inline void dz_transmit_chars(struct dz_port *dport) if (uart_circ_chars_pending(xmit) < DZ_WAKEUP_CHARS) uart_write_wakeup(&dport->port); - /* Are we done */ + /* Are we are done. */ if (uart_circ_empty(xmit)) dz_stop_tx(&dport->port); } /* * ------------------------------------------------------------ - * check_modem_status () + * check_modem_status() * - * Only valid for the MODEM line duh ! + * DS 3100 & 5100: Only valid for the MODEM line, duh! + * DS 5000/200: Valid for the MODEM and PRINTER line. * ------------------------------------------------------------ */ static inline void check_modem_status(struct dz_port *dport) { + /* + * FIXME: + * 1. No status change interrupt; use a timer. + * 2. Handle the 3100/5000 as appropriate. --macro + */ unsigned short status; - /* if not ne modem line just return */ + /* If not the modem line just return. */ if (dport->port.line != DZ_MODEM) return; @@ -341,21 +325,18 @@ static inline void check_modem_status(struct dz_port *dport) */ static irqreturn_t dz_interrupt(int irq, void *dev) { - struct dz_port *dport; + struct dz_port *dport = (struct dz_port *)dev; 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)]; + status = dz_in(dport, DZ_CSR); - if (status & DZ_RDONE) - dz_receive_chars(dport); + if ((status & (DZ_RDONE | DZ_RIE)) == (DZ_RDONE | DZ_RIE)) + dz_receive_chars(dport, regs); - if (status & DZ_TRDY) + if ((status & (DZ_TRDY | DZ_TIE)) == (DZ_TRDY | DZ_TIE)) dz_transmit_chars(dport); - /* FIXME: what about check modem status??? --rmk */ - return IRQ_HANDLED; } @@ -367,13 +348,13 @@ static irqreturn_t dz_interrupt(int irq, void *dev) static unsigned int dz_get_mctrl(struct uart_port *uport) { + /* + * FIXME: Handle the 3100/5000 as appropriate. --macro + */ 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; } @@ -383,6 +364,9 @@ static unsigned int dz_get_mctrl(struct uart_port *uport) static void dz_set_mctrl(struct uart_port *uport, unsigned int mctrl) { + /* + * FIXME: Handle the 3100/5000 as appropriate. --macro + */ struct dz_port *dport = (struct dz_port *)uport; unsigned short tmp; @@ -409,13 +393,6 @@ static int dz_startup(struct uart_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 */ @@ -442,7 +419,8 @@ static void dz_shutdown(struct uart_port *uport) } /* - * get_lsr_info - get line status register info + * ------------------------------------------------------------------- + * dz_tx_empty() -- get the transmitter empty status * * Purpose: Let user call ioctl() to get info when the UART physically * is emptied. On bus types like RS485, the transmitter must @@ -450,21 +428,28 @@ static void dz_shutdown(struct uart_port *uport) * 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); + unsigned short tmp, mask = 1 << dport->port.line; - /* FIXME: this appears to be obviously broken --rmk. */ - return status ? TIOCSER_TEMT : 0; + tmp = dz_in(dport, DZ_TCR); + tmp &= mask; + + return tmp ? 0 : TIOCSER_TEMT; } static void dz_break_ctl(struct uart_port *uport, int break_state) { + /* + * FIXME: Can't access BREAK bits in TDR easily; + * reuse the code for polled TX. --macro + */ struct dz_port *dport = (struct dz_port *)uport; unsigned long flags; - unsigned short tmp, mask = 1 << uport->line; + unsigned short tmp, mask = 1 << dport->port.line; spin_lock_irqsave(&uport->lock, flags); tmp = dz_in(dport, DZ_TCR); @@ -561,7 +546,7 @@ static void dz_set_termios(struct uart_port *uport, struct termios *termios, spin_lock_irqsave(&dport->port.lock, flags); - dz_out(dport, DZ_LPR, cflag); + dz_out(dport, DZ_LPR, cflag | dport->port.line); dport->cflag = cflag; /* setup accept flag */ @@ -650,7 +635,7 @@ static void __init dz_init_ports(void) 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 = UPIO_PORT; + dport->port.iotype = UPIO_MEM; dport->port.irq = dec_interrupt[DEC_IRQ_DZ11]; dport->port.line = i; dport->port.fifosize = 1; @@ -662,10 +647,7 @@ static void __init dz_init_ports(void) 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 */ @@ -673,26 +655,55 @@ static void dz_reset(struct dz_port *dport) } #ifdef CONFIG_SERIAL_DZ_CONSOLE +/* + * ------------------------------------------------------------------- + * dz_console_putchar() -- transmit a character + * + * Polled transmission. This is tricky. We need to mask transmit + * interrupts so that they do not interfere, enable the transmitter + * for the line requested and then wait till the transmit scanner + * requests data for this line. But it may request data for another + * line first, in which case we have to disable its transmitter and + * repeat waiting till our line pops up. Only then the character may + * be transmitted. Finally, the state of the transmitter mask is + * restored. Welcome to the world of PDP-11! + * ------------------------------------------------------------------- + */ static void dz_console_putchar(struct uart_port *uport, int ch) { struct dz_port *dport = (struct dz_port *)uport; unsigned long flags; - int loops = 2500; - unsigned short tmp = (unsigned char)ch; - /* this code sends stuff out to serial device - spinning its - wheels and waiting. */ + unsigned short csr, tcr, trdy, mask; + int loops = 10000; spin_lock_irqsave(&dport->port.lock, flags); + csr = dz_in(dport, DZ_CSR); + dz_out(dport, DZ_CSR, csr & ~DZ_TIE); + tcr = dz_in(dport, DZ_TCR); + tcr |= 1 << dport->port.line; + mask = tcr; + dz_out(dport, DZ_TCR, mask); + iob(); + spin_unlock_irqrestore(&dport->port.lock, flags); - /* spin our wheels */ - while (((dz_in(dport, DZ_CSR) & DZ_TRDY) != DZ_TRDY) && loops--) - /* FIXME: cpu_relax, udelay? --rmk */ - ; + while (loops--) { + trdy = dz_in(dport, DZ_CSR); + if (!(trdy & DZ_TRDY)) + continue; + trdy = (trdy & DZ_TLINE) >> 8; + if (trdy == dport->port.line) + break; + mask &= ~(1 << trdy); + dz_out(dport, DZ_TCR, mask); + iob(); + udelay(2); + } - /* Actually transmit the character. */ - dz_out(dport, DZ_TDR, tmp); + if (loops) /* Cannot send otherwise. */ + dz_out(dport, DZ_TDR, ch); - spin_unlock_irqrestore(&dport->port.lock, flags); + dz_out(dport, DZ_TCR, tcr); + dz_out(dport, DZ_CSR, csr); } /* @@ -703,11 +714,11 @@ static void dz_console_putchar(struct uart_port *uport, int ch) * The console must be locked when we get here. * ------------------------------------------------------------------- */ -static void dz_console_print(struct console *cons, +static void dz_console_print(struct console *co, const char *str, unsigned int count) { - struct dz_port *dport = &dz_ports[CONSOLE_LINE]; + struct dz_port *dport = &dz_ports[co->index]; #ifdef DEBUG_DZ prom_printf((char *) str); #endif @@ -716,49 +727,43 @@ static void dz_console_print(struct console *cons, static int __init dz_console_setup(struct console *co, char *options) { - struct dz_port *dport = &dz_ports[CONSOLE_LINE]; + struct dz_port *dport = &dz_ports[co->index]; 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; + return uart_set_options(&dport->port, co, baud, parity, bits, flow); } -static struct console dz_sercons = -{ +static struct uart_driver dz_reg; +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, + .flags = CON_PRINTBUFFER, + .index = -1, + .data = &dz_reg, }; -void __init dz_serial_console_init(void) +static int __init dz_serial_console_init(void) { - dz_init_ports(); - - register_console(&dz_sercons); + if (!IOASIC) { + dz_init_ports(); + register_console(&dz_sercons); + return 0; + } else + return -ENXIO; } +console_initcall(dz_serial_console_init); + #define SERIAL_DZ_CONSOLE &dz_sercons #else #define SERIAL_DZ_CONSOLE NULL @@ -767,35 +772,29 @@ void __init dz_serial_console_init(void) static struct uart_driver dz_reg = { .owner = THIS_MODULE, .driver_name = "serial", - .dev_name = "ttyS%d", + .dev_name = "ttyS", .major = TTY_MAJOR, .minor = 64, .nr = DZ_NB_PORT, .cons = SERIAL_DZ_CONSOLE, }; -int __init dz_init(void) +static int __init dz_init(void) { - unsigned long flags; int ret, i; + if (IOASIC) + return -ENXIO; + 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, IRQF_DISABLED, "DZ", &dz_ports[0])) panic("Unable to register DZ interrupt"); @@ -810,5 +809,7 @@ int __init dz_init(void) return ret; } +module_init(dz_init); + MODULE_DESCRIPTION("DECstation DZ serial driver"); MODULE_LICENSE("GPL"); |