diff options
Diffstat (limited to 'drivers/serial')
| -rw-r--r-- | drivers/serial/dz.c | 289 |
1 files changed, 188 insertions, 101 deletions
diff --git a/drivers/serial/dz.c b/drivers/serial/dz.c index c054c1bd8b24..116211fcd36f 100644 --- a/drivers/serial/dz.c +++ b/drivers/serial/dz.c @@ -39,6 +39,7 @@ #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> @@ -47,7 +48,9 @@ #include <linux/sysrq.h> #include <linux/tty.h> +#include <asm/atomic.h> #include <asm/bootinfo.h> +#include <asm/io.h> #include <asm/system.h> #include <asm/dec/interrupts.h> @@ -55,18 +58,32 @@ #include <asm/dec/kn02.h> #include <asm/dec/machtype.h> #include <asm/dec/prom.h> +#include <asm/dec/system.h> #include "dz.h" -static char *dz_name = "DECstation DZ serial driver version "; -static char *dz_version = "1.03"; + +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; }; -static struct dz_port dz_ports[DZ_NB_PORT]; +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) { @@ -82,21 +99,18 @@ static inline struct dz_port *to_dport(struct uart_port *uport) * ------------------------------------------------------------ */ -static inline unsigned short dz_in(struct dz_port *dport, unsigned offset) +static u16 dz_in(struct dz_port *dport, unsigned offset) { - volatile unsigned short *addr = - (volatile unsigned short *) (dport->port.membase + offset); + void __iomem *addr = dport->port.membase + offset; - return *addr; + return readw(addr); } -static inline void dz_out(struct dz_port *dport, unsigned offset, - unsigned short value) +static void dz_out(struct dz_port *dport, unsigned offset, u16 value) { - volatile unsigned short *addr = - (volatile unsigned short *) (dport->port.membase + offset); + void __iomem *addr = dport->port.membase + offset; - *addr = value; + writew(value, addr); } /* @@ -112,7 +126,7 @@ static inline void dz_out(struct dz_port *dport, unsigned offset, static void dz_stop_tx(struct uart_port *uport) { struct dz_port *dport = to_dport(uport); - unsigned short tmp, mask = 1 << dport->port.line; + u16 tmp, mask = 1 << dport->port.line; tmp = dz_in(dport, DZ_TCR); /* read the TX flag */ tmp &= ~mask; /* clear the TX flag */ @@ -122,7 +136,7 @@ static void dz_stop_tx(struct uart_port *uport) static void dz_start_tx(struct uart_port *uport) { struct dz_port *dport = to_dport(uport); - unsigned short tmp, mask = 1 << dport->port.line; + u16 tmp, mask = 1 << dport->port.line; tmp = dz_in(dport, DZ_TCR); /* read the TX flag */ tmp |= mask; /* set the TX flag */ @@ -137,7 +151,7 @@ static void dz_stop_rx(struct uart_port *uport) dz_out(dport, DZ_LPR, dport->cflag); } -static void dz_enable_ms(struct uart_port *port) +static void dz_enable_ms(struct uart_port *uport) { /* nothing to do */ } @@ -169,19 +183,19 @@ 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_in) +static inline void dz_receive_chars(struct dz_mux *mux) { struct uart_port *uport; - struct dz_port *dport; + struct dz_port *dport = &mux->dport[0]; struct tty_struct *tty = NULL; struct uart_icount *icount; int lines_rx[DZ_NB_PORT] = { [0 ... DZ_NB_PORT - 1] = 0 }; - unsigned short status; unsigned char ch, flag; + u16 status; int i; - while ((status = dz_in(dport_in, DZ_RBUF)) & DZ_DVAL) { - dport = &dz_ports[LINE(status)]; + while ((status = dz_in(dport, DZ_RBUF)) & DZ_DVAL) { + dport = &mux->dport[LINE(status)]; uport = &dport->port; tty = uport->info->tty; /* point to the proper dev */ @@ -235,7 +249,7 @@ static inline void dz_receive_chars(struct dz_port *dport_in) } for (i = 0; i < DZ_NB_PORT; i++) if (lines_rx[i]) - tty_flip_buffer_push(dz_ports[i].port.info->tty); + tty_flip_buffer_push(mux->dport[i].port.info->tty); } /* @@ -245,15 +259,15 @@ static inline void dz_receive_chars(struct dz_port *dport_in) * This routine deals with outputs to any lines. * ------------------------------------------------------------ */ -static inline void dz_transmit_chars(struct dz_port *dport_in) +static inline void dz_transmit_chars(struct dz_mux *mux) { - struct dz_port *dport; + struct dz_port *dport = &mux->dport[0]; struct circ_buf *xmit; - unsigned short status; unsigned char tmp; + u16 status; - status = dz_in(dport_in, DZ_CSR); - dport = &dz_ports[LINE(status)]; + status = dz_in(dport, DZ_CSR); + dport = &mux->dport[LINE(status)]; xmit = &dport->port.info->xmit; if (dport->port.x_char) { /* XON/XOFF chars */ @@ -305,7 +319,7 @@ static inline void check_modem_status(struct dz_port *dport) * 1. No status change interrupt; use a timer. * 2. Handle the 3100/5000 as appropriate. --macro */ - unsigned short status; + u16 status; /* If not the modem line just return. */ if (dport->port.line != DZ_MODEM) @@ -326,19 +340,20 @@ static inline void check_modem_status(struct dz_port *dport) * It deals with the multiple ports. * ------------------------------------------------------------ */ -static irqreturn_t dz_interrupt(int irq, void *dev) +static irqreturn_t dz_interrupt(int irq, void *dev_id) { - struct dz_port *dport = dev; - unsigned short status; + 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(dport); + dz_receive_chars(mux); if ((status & (DZ_TRDY | DZ_TIE)) == (DZ_TRDY | DZ_TIE)) - dz_transmit_chars(dport); + dz_transmit_chars(mux); return IRQ_HANDLED; } @@ -371,7 +386,7 @@ 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); - unsigned short tmp; + u16 tmp; if (dport->port.line == DZ_MODEM) { tmp = dz_in(dport, DZ_TCR); @@ -393,14 +408,29 @@ static void dz_set_mctrl(struct uart_port *uport, unsigned int mctrl) static int dz_startup(struct uart_port *uport) { struct dz_port *dport = to_dport(uport); + struct dz_mux *mux = dport->mux; unsigned long flags; - unsigned short tmp; + 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 the interrupt and the scanning */ + /* Enable interrupts. */ tmp = dz_in(dport, DZ_CSR); - tmp |= DZ_RIE | DZ_TIE | DZ_MSE; + tmp |= DZ_RIE | DZ_TIE; dz_out(dport, DZ_CSR, tmp); spin_unlock_irqrestore(&dport->port.lock, flags); @@ -419,11 +449,24 @@ static int dz_startup(struct uart_port *uport) 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); + } } /* @@ -507,6 +550,24 @@ static int dz_encode_baud_rate(unsigned int baud) } } + +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) { @@ -581,36 +642,86 @@ static void dz_set_termios(struct uart_port *uport, struct ktermios *termios, spin_unlock_irqrestore(&dport->port.lock, flags); } -static const char *dz_type(struct uart_port *port) +static const char *dz_type(struct uart_port *uport) { return "DZ"; } -static void dz_release_port(struct uart_port *port) +static void dz_release_port(struct uart_port *uport) { - /* nothing to do */ + 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_request_port(struct uart_port *port) +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 void dz_config_port(struct uart_port *port, int flags) +static int dz_request_port(struct uart_port *uport) { - if (flags & UART_CONFIG_TYPE) - port->type = PORT_DZ; + 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). + * Verify the new serial_struct (for TIOCSSERIAL). */ -static int dz_verify_port(struct uart_port *port, struct serial_struct *ser) +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 != port->irq) + if (ser->irq != uport->irq) ret = -EINVAL; return ret; } @@ -637,40 +748,32 @@ static struct uart_ops dz_ops = { static void __init dz_init_ports(void) { static int first = 1; - struct dz_port *dport; unsigned long base; - int i; + int line; if (!first) return; first = 0; - if (mips_machtype == MACH_DS23100 || - mips_machtype == MACH_DS5100) - base = CKSEG1ADDR(KN01_SLOT_BASE + KN01_DZ11); + if (mips_machtype == MACH_DS23100 || mips_machtype == MACH_DS5100) + base = dec_kn_slot_base + KN01_DZ11; else - base = CKSEG1ADDR(KN02_SLOT_BASE + KN02_DZ11); - - 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_MEM; - 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; - } -} + base = dec_kn_slot_base + KN02_DZ11; -static void dz_reset(struct dz_port *dport) -{ - dz_out(dport, DZ_CSR, DZ_CLR); - while (dz_in(dport, DZ_CSR) & DZ_CLR); - iob(); + for (line = 0; line < DZ_NB_PORT; line++) { + struct dz_port *dport = &dz_mux.dport[line]; + struct uart_port *uport = &dport->port; - /* enable scanning */ - dz_out(dport, DZ_CSR, DZ_MSE); + 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 @@ -737,7 +840,7 @@ static void dz_console_print(struct console *co, const char *str, unsigned int count) { - struct dz_port *dport = &dz_ports[co->index]; + struct dz_port *dport = &dz_mux.dport[co->index]; #ifdef DEBUG_DZ prom_printf((char *) str); #endif @@ -746,17 +849,23 @@ static void dz_console_print(struct console *co, static int __init dz_console_setup(struct console *co, char *options) { - struct dz_port *dport = &dz_ports[co->index]; + 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; - if (options) - uart_parse_options(options, &baud, &parity, &bits, &flow); + ret = dz_map_port(uport); + if (ret) + return ret; dz_reset(dport); + if (options) + uart_parse_options(options, &baud, &parity, &bits, &flow); + return uart_set_options(&dport->port, co, baud, parity, bits, flow); } @@ -809,36 +918,14 @@ static int __init dz_init(void) dz_init_ports(); -#ifndef CONFIG_SERIAL_DZ_CONSOLE - /* reset the chip */ - dz_reset(&dz_ports[0]); -#endif - ret = uart_register_driver(&dz_reg); - if (ret != 0) - goto out; - - ret = request_irq(dz_ports[0].port.irq, dz_interrupt, IRQF_DISABLED, - "DZ", &dz_ports[0]); - if (ret != 0) { - printk(KERN_ERR "dz: Cannot get IRQ %d!\n", - dz_ports[0].port.irq); - goto out_unregister; - } + if (ret) + return ret; for (i = 0; i < DZ_NB_PORT; i++) - uart_add_one_port(&dz_reg, &dz_ports[i].port); - - return ret; + uart_add_one_port(&dz_reg, &dz_mux.dport[i].port); -out_unregister: - uart_unregister_driver(&dz_reg); - -out: - return ret; + return 0; } module_init(dz_init); - -MODULE_DESCRIPTION("DECstation DZ serial driver"); -MODULE_LICENSE("GPL"); |