123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770771772773774775776777778779780781782783784785786787788789790791792793794795796797798799800801802803804805806807808809810811812813814815816817818819820821822823824825826827828829830831832833834835836837838839840841842843844845846847848849850851852853854855856857858859860861862863864865866867868869870871872873874875876877878879880881882883884885886887888889890891892893894895896897898899900901902903904905906907908909910911912913914915916917918919920921922923924925926927928929930931932933934935936937938939940941942943944945946947948949 |
- // SPDX-License-Identifier: GPL-2.0
- /*
- * 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, 2007 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
- * 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
- #if defined(CONFIG_SERIAL_DZ_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
- #define SUPPORT_SYSRQ
- #endif
- #include <linux/bitops.h>
- #include <linux/compiler.h>
- #include <linux/console.h>
- #include <linux/delay.h>
- #include <linux/errno.h>
- #include <linux/init.h>
- #include <linux/interrupt.h>
- #include <linux/ioport.h>
- #include <linux/kernel.h>
- #include <linux/major.h>
- #include <linux/module.h>
- #include <linux/serial.h>
- #include <linux/serial_core.h>
- #include <linux/sysrq.h>
- #include <linux/tty.h>
- #include <linux/tty_flip.h>
- #include <linux/atomic.h>
- #include <asm/bootinfo.h>
- #include <asm/io.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/dec/system.h>
- #include "dz.h"
- MODULE_DESCRIPTION("DECstation DZ serial driver");
- MODULE_LICENSE("GPL");
- static char dz_name[] __initdata = "DECstation DZ serial driver version ";
- static char dz_version[] __initdata = "1.04";
- struct dz_port {
- struct dz_mux *mux;
- struct uart_port port;
- unsigned int cflag;
- };
- struct dz_mux {
- struct dz_port dport[DZ_NB_PORT];
- atomic_t map_guard;
- atomic_t irq_guard;
- int initialised;
- };
- static struct dz_mux dz_mux;
- static inline struct dz_port *to_dport(struct uart_port *uport)
- {
- return container_of(uport, struct dz_port, port);
- }
- /*
- * ------------------------------------------------------------
- * dz_in () and dz_out ()
- *
- * These routines are used to access the registers of the DZ
- * chip, hiding relocation differences between implementation.
- * ------------------------------------------------------------
- */
- static u16 dz_in(struct dz_port *dport, unsigned offset)
- {
- void __iomem *addr = dport->port.membase + offset;
- return readw(addr);
- }
- static void dz_out(struct dz_port *dport, unsigned offset, u16 value)
- {
- void __iomem *addr = dport->port.membase + offset;
- writew(value, addr);
- }
- /*
- * ------------------------------------------------------------
- * 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 = to_dport(uport);
- u16 tmp, mask = 1 << dport->port.line;
- tmp = dz_in(dport, DZ_TCR); /* read the TX flag */
- tmp &= ~mask; /* clear the TX flag */
- dz_out(dport, DZ_TCR, tmp);
- }
- static void dz_start_tx(struct uart_port *uport)
- {
- struct dz_port *dport = to_dport(uport);
- u16 tmp, mask = 1 << dport->port.line;
- tmp = dz_in(dport, DZ_TCR); /* read the TX flag */
- tmp |= mask; /* set the TX flag */
- dz_out(dport, DZ_TCR, tmp);
- }
- static void dz_stop_rx(struct uart_port *uport)
- {
- struct dz_port *dport = to_dport(uport);
- dport->cflag &= ~DZ_RXENAB;
- dz_out(dport, DZ_LPR, dport->cflag);
- }
- /*
- * ------------------------------------------------------------
- *
- * 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
- * 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:
- *
- * 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_mux *mux)
- {
- struct uart_port *uport;
- struct dz_port *dport = &mux->dport[0];
- struct uart_icount *icount;
- int lines_rx[DZ_NB_PORT] = { [0 ... DZ_NB_PORT - 1] = 0 };
- unsigned char ch, flag;
- u16 status;
- int i;
- while ((status = dz_in(dport, DZ_RBUF)) & DZ_DVAL) {
- dport = &mux->dport[LINE(status)];
- uport = &dport->port;
- ch = UCHAR(status); /* grab the char */
- flag = TTY_NORMAL;
- icount = &uport->icount;
- icount->rx++;
- if (unlikely(status & (DZ_OERR | DZ_FERR | DZ_PERR))) {
- /*
- * There is no separate BREAK status bit, so treat
- * null characters with framing errors as BREAKs;
- * normally, otherwise. For this move the Framing
- * Error bit to a simulated BREAK bit.
- */
- if (!ch) {
- status |= (status & DZ_FERR) >>
- (ffs(DZ_FERR) - ffs(DZ_BREAK));
- status &= ~DZ_FERR;
- }
- /* Handle SysRq/SAK & keep track of the statistics. */
- if (status & DZ_BREAK) {
- icount->brk++;
- if (uart_handle_break(uport))
- continue;
- } else if (status & DZ_FERR)
- icount->frame++;
- else if (status & DZ_PERR)
- icount->parity++;
- if (status & DZ_OERR)
- icount->overrun++;
- status &= uport->read_status_mask;
- if (status & DZ_BREAK)
- flag = TTY_BREAK;
- else if (status & DZ_FERR)
- flag = TTY_FRAME;
- else if (status & DZ_PERR)
- flag = TTY_PARITY;
- }
- if (uart_handle_sysrq_char(uport, ch))
- continue;
- uart_insert_char(uport, 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(&mux->dport[i].port.state->port);
- }
- /*
- * ------------------------------------------------------------
- * transmit_char ()
- *
- * This routine deals with outputs to any lines.
- * ------------------------------------------------------------
- */
- static inline void dz_transmit_chars(struct dz_mux *mux)
- {
- struct dz_port *dport = &mux->dport[0];
- struct circ_buf *xmit;
- unsigned char tmp;
- u16 status;
- status = dz_in(dport, DZ_CSR);
- dport = &mux->dport[LINE(status)];
- xmit = &dport->port.state->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 (uart_circ_empty(xmit) || uart_tx_stopped(&dport->port)) {
- spin_lock(&dport->port.lock);
- dz_stop_tx(&dport->port);
- spin_unlock(&dport->port.lock);
- return;
- }
- /*
- * 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);
- 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 are done. */
- if (uart_circ_empty(xmit)) {
- spin_lock(&dport->port.lock);
- dz_stop_tx(&dport->port);
- spin_unlock(&dport->port.lock);
- }
- }
- /*
- * ------------------------------------------------------------
- * check_modem_status()
- *
- * 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
- */
- u16 status;
- /* If not the 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_id)
- {
- struct dz_mux *mux = dev_id;
- struct dz_port *dport = &mux->dport[0];
- u16 status;
- /* get the reason why we just got an irq */
- status = dz_in(dport, DZ_CSR);
- if ((status & (DZ_RDONE | DZ_RIE)) == (DZ_RDONE | DZ_RIE))
- dz_receive_chars(mux);
- if ((status & (DZ_TRDY | DZ_TIE)) == (DZ_TRDY | DZ_TIE))
- dz_transmit_chars(mux);
- return IRQ_HANDLED;
- }
- /*
- * -------------------------------------------------------------------
- * Here ends the DZ interrupt routines.
- * -------------------------------------------------------------------
- */
- static unsigned int dz_get_mctrl(struct uart_port *uport)
- {
- /*
- * FIXME: Handle the 3100/5000 as appropriate. --macro
- */
- struct dz_port *dport = to_dport(uport);
- unsigned int mctrl = TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
- if (dport->port.line == DZ_MODEM) {
- 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)
- {
- /*
- * FIXME: Handle the 3100/5000 as appropriate. --macro
- */
- struct dz_port *dport = to_dport(uport);
- u16 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 = to_dport(uport);
- struct dz_mux *mux = dport->mux;
- unsigned long flags;
- int irq_guard;
- int ret;
- u16 tmp;
- irq_guard = atomic_add_return(1, &mux->irq_guard);
- if (irq_guard != 1)
- return 0;
- ret = request_irq(dport->port.irq, dz_interrupt,
- IRQF_SHARED, "dz", mux);
- if (ret) {
- atomic_add(-1, &mux->irq_guard);
- printk(KERN_ERR "dz: Cannot get IRQ %d!\n", dport->port.irq);
- return ret;
- }
- spin_lock_irqsave(&dport->port.lock, flags);
- /* Enable interrupts. */
- tmp = dz_in(dport, DZ_CSR);
- tmp |= DZ_RIE | DZ_TIE;
- 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)
- {
- struct dz_port *dport = to_dport(uport);
- struct dz_mux *mux = dport->mux;
- unsigned long flags;
- int irq_guard;
- u16 tmp;
- spin_lock_irqsave(&dport->port.lock, flags);
- dz_stop_tx(&dport->port);
- spin_unlock_irqrestore(&dport->port.lock, flags);
- irq_guard = atomic_add_return(-1, &mux->irq_guard);
- if (!irq_guard) {
- /* Disable interrupts. */
- tmp = dz_in(dport, DZ_CSR);
- tmp &= ~(DZ_RIE | DZ_TIE);
- dz_out(dport, DZ_CSR, tmp);
- free_irq(dport->port.irq, mux);
- }
- }
- /*
- * -------------------------------------------------------------------
- * 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
- * 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 = to_dport(uport);
- unsigned short tmp, mask = 1 << dport->port.line;
- 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 = to_dport(uport);
- unsigned long flags;
- unsigned short tmp, mask = 1 << dport->port.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 int dz_encode_baud_rate(unsigned int baud)
- {
- switch (baud) {
- case 50:
- return DZ_B50;
- case 75:
- return DZ_B75;
- case 110:
- return DZ_B110;
- case 134:
- return DZ_B134;
- case 150:
- return DZ_B150;
- case 300:
- return DZ_B300;
- case 600:
- return DZ_B600;
- case 1200:
- return DZ_B1200;
- case 1800:
- return DZ_B1800;
- case 2000:
- return DZ_B2000;
- case 2400:
- return DZ_B2400;
- case 3600:
- return DZ_B3600;
- case 4800:
- return DZ_B4800;
- case 7200:
- return DZ_B7200;
- case 9600:
- return DZ_B9600;
- default:
- return -1;
- }
- }
- static void dz_reset(struct dz_port *dport)
- {
- struct dz_mux *mux = dport->mux;
- if (mux->initialised)
- return;
- dz_out(dport, DZ_CSR, DZ_CLR);
- while (dz_in(dport, DZ_CSR) & DZ_CLR);
- iob();
- /* Enable scanning. */
- dz_out(dport, DZ_CSR, DZ_MSE);
- mux->initialised = 1;
- }
- static void dz_set_termios(struct uart_port *uport, struct ktermios *termios,
- struct ktermios *old_termios)
- {
- struct dz_port *dport = to_dport(uport);
- unsigned long flags;
- unsigned int cflag, baud;
- int bflag;
- 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);
- bflag = dz_encode_baud_rate(baud);
- if (bflag < 0) { /* Try to keep unchanged. */
- baud = uart_get_baud_rate(uport, old_termios, NULL, 50, 9600);
- bflag = dz_encode_baud_rate(baud);
- if (bflag < 0) { /* Resort to 9600. */
- baud = 9600;
- bflag = DZ_B9600;
- }
- tty_termios_encode_baud_rate(termios, baud, baud);
- }
- cflag |= bflag;
- if (termios->c_cflag & CREAD)
- cflag |= DZ_RXENAB;
- spin_lock_irqsave(&dport->port.lock, flags);
- uart_update_timeout(uport, termios->c_cflag, baud);
- 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;
- if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
- dport->port.read_status_mask |= DZ_BREAK;
- /* characters to ignore */
- uport->ignore_status_mask = 0;
- if ((termios->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))
- dport->port.ignore_status_mask |= DZ_OERR;
- if (termios->c_iflag & IGNPAR)
- dport->port.ignore_status_mask |= DZ_FERR | DZ_PERR;
- if (termios->c_iflag & IGNBRK)
- dport->port.ignore_status_mask |= DZ_BREAK;
- spin_unlock_irqrestore(&dport->port.lock, flags);
- }
- /*
- * Hack alert!
- * Required solely so that the initial PROM-based console
- * works undisturbed in parallel with this one.
- */
- static void dz_pm(struct uart_port *uport, unsigned int state,
- unsigned int oldstate)
- {
- struct dz_port *dport = to_dport(uport);
- unsigned long flags;
- spin_lock_irqsave(&dport->port.lock, flags);
- if (state < 3)
- dz_start_tx(&dport->port);
- else
- dz_stop_tx(&dport->port);
- spin_unlock_irqrestore(&dport->port.lock, flags);
- }
- static const char *dz_type(struct uart_port *uport)
- {
- return "DZ";
- }
- static void dz_release_port(struct uart_port *uport)
- {
- struct dz_mux *mux = to_dport(uport)->mux;
- int map_guard;
- iounmap(uport->membase);
- uport->membase = NULL;
- map_guard = atomic_add_return(-1, &mux->map_guard);
- if (!map_guard)
- release_mem_region(uport->mapbase, dec_kn_slot_size);
- }
- static int dz_map_port(struct uart_port *uport)
- {
- if (!uport->membase)
- uport->membase = ioremap_nocache(uport->mapbase,
- dec_kn_slot_size);
- if (!uport->membase) {
- printk(KERN_ERR "dz: Cannot map MMIO\n");
- return -ENOMEM;
- }
- return 0;
- }
- static int dz_request_port(struct uart_port *uport)
- {
- struct dz_mux *mux = to_dport(uport)->mux;
- int map_guard;
- int ret;
- map_guard = atomic_add_return(1, &mux->map_guard);
- if (map_guard == 1) {
- if (!request_mem_region(uport->mapbase, dec_kn_slot_size,
- "dz")) {
- atomic_add(-1, &mux->map_guard);
- printk(KERN_ERR
- "dz: Unable to reserve MMIO resource\n");
- return -EBUSY;
- }
- }
- ret = dz_map_port(uport);
- if (ret) {
- map_guard = atomic_add_return(-1, &mux->map_guard);
- if (!map_guard)
- release_mem_region(uport->mapbase, dec_kn_slot_size);
- return ret;
- }
- return 0;
- }
- static void dz_config_port(struct uart_port *uport, int flags)
- {
- struct dz_port *dport = to_dport(uport);
- if (flags & UART_CONFIG_TYPE) {
- if (dz_request_port(uport))
- return;
- uport->type = PORT_DZ;
- dz_reset(dport);
- }
- }
- /*
- * Verify the new serial_struct (for TIOCSSERIAL).
- */
- static int dz_verify_port(struct uart_port *uport, struct serial_struct *ser)
- {
- int ret = 0;
- if (ser->type != PORT_UNKNOWN && ser->type != PORT_DZ)
- ret = -EINVAL;
- if (ser->irq != uport->irq)
- ret = -EINVAL;
- return ret;
- }
- static const 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,
- .break_ctl = dz_break_ctl,
- .startup = dz_startup,
- .shutdown = dz_shutdown,
- .set_termios = dz_set_termios,
- .pm = dz_pm,
- .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;
- unsigned long base;
- int line;
- if (!first)
- return;
- first = 0;
- if (mips_machtype == MACH_DS23100 || mips_machtype == MACH_DS5100)
- base = dec_kn_slot_base + KN01_DZ11;
- else
- base = dec_kn_slot_base + KN02_DZ11;
- for (line = 0; line < DZ_NB_PORT; line++) {
- struct dz_port *dport = &dz_mux.dport[line];
- struct uart_port *uport = &dport->port;
- dport->mux = &dz_mux;
- uport->irq = dec_interrupt[DEC_IRQ_DZ11];
- uport->fifosize = 1;
- uport->iotype = UPIO_MEM;
- uport->flags = UPF_BOOT_AUTOCONF;
- uport->ops = &dz_ops;
- uport->line = line;
- uport->mapbase = base;
- }
- }
- #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 = to_dport(uport);
- unsigned long flags;
- 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);
- do {
- 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);
- } while (--loops);
- if (loops) /* Cannot send otherwise. */
- dz_out(dport, DZ_TDR, ch);
- dz_out(dport, DZ_TCR, tcr);
- dz_out(dport, DZ_CSR, csr);
- }
- /*
- * -------------------------------------------------------------------
- * 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 *co,
- const char *str,
- unsigned int count)
- {
- struct dz_port *dport = &dz_mux.dport[co->index];
- #ifdef DEBUG_DZ
- prom_printf((char *) str);
- #endif
- uart_console_write(&dport->port, str, count, dz_console_putchar);
- }
- static int __init dz_console_setup(struct console *co, char *options)
- {
- struct dz_port *dport = &dz_mux.dport[co->index];
- struct uart_port *uport = &dport->port;
- int baud = 9600;
- int bits = 8;
- int parity = 'n';
- int flow = 'n';
- int ret;
- ret = dz_map_port(uport);
- if (ret)
- return ret;
- spin_lock_init(&dport->port.lock); /* For dz_pm(). */
- dz_reset(dport);
- dz_pm(uport, 0, -1);
- if (options)
- uart_parse_options(options, &baud, &parity, &bits, &flow);
- return uart_set_options(&dport->port, co, baud, parity, bits, flow);
- }
- static struct uart_driver dz_reg;
- static struct console dz_console = {
- .name = "ttyS",
- .write = dz_console_print,
- .device = uart_console_device,
- .setup = dz_console_setup,
- .flags = CON_PRINTBUFFER,
- .index = -1,
- .data = &dz_reg,
- };
- static int __init dz_serial_console_init(void)
- {
- if (!IOASIC) {
- dz_init_ports();
- register_console(&dz_console);
- return 0;
- } else
- return -ENXIO;
- }
- console_initcall(dz_serial_console_init);
- #define SERIAL_DZ_CONSOLE &dz_console
- #else
- #define SERIAL_DZ_CONSOLE NULL
- #endif /* CONFIG_SERIAL_DZ_CONSOLE */
- static struct uart_driver dz_reg = {
- .owner = THIS_MODULE,
- .driver_name = "serial",
- .dev_name = "ttyS",
- .major = TTY_MAJOR,
- .minor = 64,
- .nr = DZ_NB_PORT,
- .cons = SERIAL_DZ_CONSOLE,
- };
- static int __init dz_init(void)
- {
- int ret, i;
- if (IOASIC)
- return -ENXIO;
- printk("%s%s\n", dz_name, dz_version);
- dz_init_ports();
- ret = uart_register_driver(&dz_reg);
- if (ret)
- return ret;
- for (i = 0; i < DZ_NB_PORT; i++)
- uart_add_one_port(&dz_reg, &dz_mux.dport[i].port);
- return 0;
- }
- module_init(dz_init);
|