diff options
Diffstat (limited to 'drivers/serial')
| -rw-r--r-- | drivers/serial/8250_au1x00.c | 2 | ||||
| -rw-r--r-- | drivers/serial/Kconfig | 16 | ||||
| -rw-r--r-- | drivers/serial/Makefile | 1 | ||||
| -rw-r--r-- | drivers/serial/amba-pl010.c | 160 | ||||
| -rw-r--r-- | drivers/serial/au1x00_uart.c | 1287 |
5 files changed, 68 insertions, 1398 deletions
diff --git a/drivers/serial/8250_au1x00.c b/drivers/serial/8250_au1x00.c index 8d8d7a70d03..3d1bfd07208 100644 --- a/drivers/serial/8250_au1x00.c +++ b/drivers/serial/8250_au1x00.c @@ -51,7 +51,7 @@ static struct plat_serial8250_port au1x00_data[] = { #elif defined(CONFIG_SOC_AU1100) PORT(UART0_ADDR, AU1100_UART0_INT), PORT(UART1_ADDR, AU1100_UART1_INT), - PORT(UART2_ADDR, AU1100_UART2_INT), + /* The internal UART2 does not exist on the AU1100 processor. */ PORT(UART3_ADDR, AU1100_UART3_INT), #elif defined(CONFIG_SOC_AU1550) PORT(UART0_ADDR, AU1550_UART0_INT), diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig index ceb3697bf84..fe0d8b8e91c 100644 --- a/drivers/serial/Kconfig +++ b/drivers/serial/Kconfig @@ -620,22 +620,6 @@ config SERIAL_SH_SCI_CONSOLE depends on SERIAL_SH_SCI=y select SERIAL_CORE_CONSOLE -config SERIAL_AU1X00 - bool "Enable Au1x00 UART Support" - depends on MIPS && SOC_AU1X00 - select SERIAL_CORE - help - If you have an Alchemy AU1X00 processor (MIPS based) and you want - to use serial ports, say Y. Otherwise, say N. - -config SERIAL_AU1X00_CONSOLE - bool "Enable Au1x00 serial console" - depends on SERIAL_AU1X00 - select SERIAL_CORE_CONSOLE - help - If you have an Alchemy AU1X00 processor (MIPS based) and you want - to use a console on a serial port, say Y. Otherwise, say N. - config SERIAL_CORE tristate diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile index a3a4323d9c8..d2b4c214876 100644 --- a/drivers/serial/Makefile +++ b/drivers/serial/Makefile @@ -41,7 +41,6 @@ obj-$(CONFIG_SERIAL_COLDFIRE) += mcfserial.o obj-$(CONFIG_V850E_UART) += v850e_uart.o obj-$(CONFIG_SERIAL_PMACZILOG) += pmac_zilog.o obj-$(CONFIG_SERIAL_LH7A40X) += serial_lh7a40x.o -obj-$(CONFIG_SERIAL_AU1X00) += au1x00_uart.o obj-$(CONFIG_SERIAL_DZ) += dz.o obj-$(CONFIG_SERIAL_SH_SCI) += sh-sci.o obj-$(CONFIG_SERIAL_SGI_L1_CONSOLE) += sn_console.o diff --git a/drivers/serial/amba-pl010.c b/drivers/serial/amba-pl010.c index 127d6cd5de7..1631414000a 100644 --- a/drivers/serial/amba-pl010.c +++ b/drivers/serial/amba-pl010.c @@ -51,8 +51,6 @@ #include <linux/amba/serial.h> #include <asm/io.h> -#include <asm/irq.h> -#include <asm/hardware.h> #define UART_NR 2 @@ -65,26 +63,16 @@ #define UART_RX_DATA(s) (((s) & UART01x_FR_RXFE) == 0) #define UART_TX_READY(s) (((s) & UART01x_FR_TXFF) == 0) -#define UART_DUMMY_RSR_RX /*256*/0 +#define UART_DUMMY_RSR_RX 256 #define UART_PORT_SIZE 64 /* - * On the Integrator platform, the port RTS and DTR are provided by - * bits in the following SC_CTRLS register bits: - * RTS DTR - * UART0 7 6 - * UART1 5 4 - */ -#define SC_CTRLC (IO_ADDRESS(INTEGRATOR_SC_BASE) + INTEGRATOR_SC_CTRLC_OFFSET) -#define SC_CTRLS (IO_ADDRESS(INTEGRATOR_SC_BASE) + INTEGRATOR_SC_CTRLS_OFFSET) - -/* * We wrap our port structure around the generic uart_port. */ struct uart_amba_port { struct uart_port port; - unsigned int dtr_mask; - unsigned int rts_mask; + struct amba_device *dev; + struct amba_pl010_data *data; unsigned int old_status; }; @@ -300,20 +288,9 @@ static unsigned int pl010_get_mctrl(struct uart_port *port) static void pl010_set_mctrl(struct uart_port *port, unsigned int mctrl) { struct uart_amba_port *uap = (struct uart_amba_port *)port; - unsigned int ctrls = 0, ctrlc = 0; - - if (mctrl & TIOCM_RTS) - ctrlc |= uap->rts_mask; - else - ctrls |= uap->rts_mask; - if (mctrl & TIOCM_DTR) - ctrlc |= uap->dtr_mask; - else - ctrls |= uap->dtr_mask; - - __raw_writel(ctrls, SC_CTRLS); - __raw_writel(ctrlc, SC_CTRLC); + if (uap->data) + uap->data->set_mctrl(uap->dev, uap->port.membase, mctrl); } static void pl010_break_ctl(struct uart_port *port, int break_state) @@ -539,38 +516,7 @@ static struct uart_ops amba_pl010_pops = { .verify_port = pl010_verify_port, }; -static struct uart_amba_port amba_ports[UART_NR] = { - { - .port = { - .membase = (void *)IO_ADDRESS(INTEGRATOR_UART0_BASE), - .mapbase = INTEGRATOR_UART0_BASE, - .iotype = UPIO_MEM, - .irq = IRQ_UARTINT0, - .uartclk = 14745600, - .fifosize = 16, - .ops = &amba_pl010_pops, - .flags = UPF_BOOT_AUTOCONF, - .line = 0, - }, - .dtr_mask = 1 << 5, - .rts_mask = 1 << 4, - }, - { - .port = { - .membase = (void *)IO_ADDRESS(INTEGRATOR_UART1_BASE), - .mapbase = INTEGRATOR_UART1_BASE, - .iotype = UPIO_MEM, - .irq = IRQ_UARTINT1, - .uartclk = 14745600, - .fifosize = 16, - .ops = &amba_pl010_pops, - .flags = UPF_BOOT_AUTOCONF, - .line = 1, - }, - .dtr_mask = 1 << 7, - .rts_mask = 1 << 6, - } -}; +static struct uart_amba_port *amba_ports[UART_NR]; #ifdef CONFIG_SERIAL_AMBA_PL010_CONSOLE @@ -588,7 +534,7 @@ static void pl010_console_putchar(struct uart_port *port, int ch) static void pl010_console_write(struct console *co, const char *s, unsigned int count) { - struct uart_port *port = &amba_ports[co->index].port; + struct uart_port *port = &amba_ports[co->index]->port; unsigned int status, old_cr; /* @@ -651,7 +597,7 @@ static int __init pl010_console_setup(struct console *co, char *options) */ if (co->index >= UART_NR) co->index = 0; - port = &amba_ports[co->index].port; + port = &amba_ports[co->index]->port; if (options) uart_parse_options(options, &baud, &parity, &bits, &flow); @@ -672,24 +618,6 @@ static struct console amba_console = { .data = &amba_reg, }; -static int __init amba_console_init(void) -{ - /* - * All port initializations are done statically - */ - register_console(&amba_console); - return 0; -} -console_initcall(amba_console_init); - -static int __init amba_late_console_init(void) -{ - if (!(amba_console.flags & CON_ENABLED)) - register_console(&amba_console); - return 0; -} -late_initcall(amba_late_console_init); - #define AMBA_CONSOLE &amba_console #else #define AMBA_CONSOLE NULL @@ -707,30 +635,76 @@ static struct uart_driver amba_reg = { static int pl010_probe(struct amba_device *dev, void *id) { - int i; + struct uart_amba_port *port; + void __iomem *base; + int i, ret; - for (i = 0; i < UART_NR; i++) { - if (amba_ports[i].port.mapbase != dev->res.start) - continue; + for (i = 0; i < ARRAY_SIZE(amba_ports); i++) + if (amba_ports[i] == NULL) + break; - amba_ports[i].port.dev = &dev->dev; - uart_add_one_port(&amba_reg, &amba_ports[i].port); - amba_set_drvdata(dev, &amba_ports[i]); - break; + if (i == ARRAY_SIZE(amba_ports)) { + ret = -EBUSY; + goto out; } - return 0; + port = kzalloc(sizeof(struct uart_amba_port), GFP_KERNEL); + if (!port) { + ret = -ENOMEM; + goto out; + } + + base = ioremap(dev->res.start, PAGE_SIZE); + if (!base) { + ret = -ENOMEM; + goto free; + } + + port->port.dev = &dev->dev; + port->port.mapbase = dev->res.start; + port->port.membase = base; + port->port.iotype = UPIO_MEM; + port->port.irq = dev->irq[0]; + port->port.uartclk = 14745600; + port->port.fifosize = 16; + port->port.ops = &amba_pl010_pops; + port->port.flags = UPF_BOOT_AUTOCONF; + port->port.line = i; + port->dev = dev; + port->data = dev->dev.platform_data; + + amba_ports[i] = port; + + amba_set_drvdata(dev, port); + ret = uart_add_one_port(&amba_reg, &port->port); + if (ret) { + amba_set_drvdata(dev, NULL); + amba_ports[i] = NULL; + iounmap(base); + free: + kfree(port); + } + + out: + return ret; } static int pl010_remove(struct amba_device *dev) { - struct uart_amba_port *uap = amba_get_drvdata(dev); - - if (uap) - uart_remove_one_port(&amba_reg, &uap->port); + struct uart_amba_port *port = amba_get_drvdata(dev); + int i; amba_set_drvdata(dev, NULL); + uart_remove_one_port(&amba_reg, &port->port); + + for (i = 0; i < ARRAY_SIZE(amba_ports); i++) + if (amba_ports[i] == port) + amba_ports[i] = NULL; + + iounmap(port->port.membase); + kfree(port); + return 0; } diff --git a/drivers/serial/au1x00_uart.c b/drivers/serial/au1x00_uart.c deleted file mode 100644 index 948880ac587..00000000000 --- a/drivers/serial/au1x00_uart.c +++ /dev/null @@ -1,1287 +0,0 @@ -/* - * Driver for 8250/16550-type serial ports - * - * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. - * - * Copyright (C) 2001 Russell King. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * A note about mapbase / membase - * - * mapbase is the physical address of the IO port. Currently, we don't - * support this very well, and it may well be dropped from this driver - * in future. As such, mapbase should be NULL. - * - * membase is an 'ioremapped' cookie. This is compatible with the old - * serial.c driver, and is currently the preferred form. - */ -#include <linux/config.h> -#include <linux/module.h> -#include <linux/tty.h> -#include <linux/ioport.h> -#include <linux/init.h> -#include <linux/console.h> -#include <linux/sysrq.h> -#include <linux/serial.h> -#include <linux/serialP.h> -#include <linux/delay.h> - -#include <asm/serial.h> -#include <asm/io.h> -#include <asm/irq.h> -#include <asm/mach-au1x00/au1000.h> - -#if defined(CONFIG_SERIAL_AU1X00_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) -#define SUPPORT_SYSRQ -#endif - -#include <linux/serial_core.h> -#include "8250.h" - -/* - * Debugging. - */ -#if 0 -#define DEBUG_AUTOCONF(fmt...) printk(fmt) -#else -#define DEBUG_AUTOCONF(fmt...) do { } while (0) -#endif - -#if 0 -#define DEBUG_INTR(fmt...) printk(fmt) -#else -#define DEBUG_INTR(fmt...) do { } while (0) -#endif - -#define PASS_LIMIT 256 - -/* - * We default to IRQ0 for the "no irq" hack. Some - * machine types want others as well - they're free - * to redefine this in their header file. - */ -#define is_real_interrupt(irq) ((irq) != 0) - -static struct old_serial_port old_serial_port[] = { - { .baud_base = 0, - .iomem_base = (u8 *)UART0_ADDR, - .irq = AU1000_UART0_INT, - .flags = STD_COM_FLAGS, - .iomem_reg_shift = 2, - }, { - .baud_base = 0, - .iomem_base = (u8 *)UART1_ADDR, - .irq = AU1000_UART1_INT, - .flags = STD_COM_FLAGS, - .iomem_reg_shift = 2 - }, { - .baud_base = 0, - .iomem_base = (u8 *)UART2_ADDR, - .irq = AU1000_UART2_INT, - .flags = STD_COM_FLAGS, - .iomem_reg_shift = 2 - }, { - .baud_base = 0, - .iomem_base = (u8 *)UART3_ADDR, - .irq = AU1000_UART3_INT, - .flags = STD_COM_FLAGS, - .iomem_reg_shift = 2 - } -}; - -#define UART_NR ARRAY_SIZE(old_serial_port) - -struct uart_8250_port { - struct uart_port port; - struct timer_list timer; /* "no irq" timer */ - struct list_head list; /* ports on this IRQ */ - unsigned short rev; - unsigned char acr; - unsigned char ier; - unsigned char lcr; - unsigned char mcr_mask; /* mask of user bits */ - unsigned char mcr_force; /* mask of forced bits */ - unsigned char lsr_break_flag; - - /* - * We provide a per-port pm hook. - */ - void (*pm)(struct uart_port *port, - unsigned int state, unsigned int old); -}; - -struct irq_info { - spinlock_t lock; - struct list_head *head; -}; - -static struct irq_info irq_lists[NR_IRQS]; - -/* - * Here we define the default xmit fifo size used for each type of UART. - */ -static const struct serial_uart_config uart_config[PORT_MAX_8250+1] = { - { "unknown", 1, 0 }, - { "8250", 1, 0 }, - { "16450", 1, 0 }, - { "16550", 1, 0 }, - /* PORT_16550A */ - { "AU1X00_UART",16, UART_CLEAR_FIFO | UART_USE_FIFO }, -}; - -static unsigned int serial_in(struct uart_8250_port *up, int offset) -{ - return au_readl((unsigned long)up->port.membase + offset); -} - -static void serial_out(struct uart_8250_port *up, int offset, int value) -{ - au_writel(value, (unsigned long)up->port.membase + offset); -} - -#define serial_inp(up, offset) serial_in(up, offset) -#define serial_outp(up, offset, value) serial_out(up, offset, value) - -/* - * This routine is called by rs_init() to initialize a specific serial - * port. It determines what type of UART chip this serial port is - * using: 8250, 16450, 16550, 16550A. The important question is - * whether or not this UART is a 16550A or not, since this will - * determine whether or not we can use its FIFO features or not. - */ -static void autoconfig(struct uart_8250_port *up, unsigned int probeflags) -{ - unsigned char save_lcr, save_mcr; - unsigned long flags; - - if (!up->port.iobase && !up->port.mapbase && !up->port.membase) - return; - - DEBUG_AUTOCONF("ttyS%d: autoconf (0x%04x, 0x%08lx): ", - up->port.line, up->port.iobase, up->port.membase); - - /* - * We really do need global IRQs disabled here - we're going to - * be frobbing the chips IRQ enable register to see if it exists. - */ - spin_lock_irqsave(&up->port.lock, flags); -// save_flags(flags); cli(); - - save_mcr = serial_in(up, UART_MCR); - save_lcr = serial_in(up, UART_LCR); - - up->port.type = PORT_16550A; - serial_outp(up, UART_LCR, save_lcr); - - up->port.fifosize = uart_config[up->port.type].dfl_xmit_fifo_size; - - if (up->port.type == PORT_UNKNOWN) - goto out; - - /* - * Reset the UART. - */ - serial_outp(up, UART_MCR, save_mcr); - serial_outp(up, UART_FCR, (UART_FCR_ENABLE_FIFO | - UART_FCR_CLEAR_RCVR | - UART_FCR_CLEAR_XMIT)); - serial_outp(up, UART_FCR, 0); - (void)serial_in(up, UART_RX); - serial_outp(up, UART_IER, 0); - - out: - spin_unlock_irqrestore(&up->port.lock, flags); -// restore_flags(flags); - DEBUG_AUTOCONF("type=%s\n", uart_config[up->port.type].name); -} - -static void serial8250_stop_tx(struct uart_port *port) -{ - struct uart_8250_port *up = (struct uart_8250_port *)port; - - if (up->ier & UART_IER_THRI) { - up->ier &= ~UART_IER_THRI; - serial_out(up, UART_IER, up->ier); - } -} - -static void serial8250_start_tx(struct uart_port *port) -{ - struct uart_8250_port *up = (struct uart_8250_port *)port; - - if (!(up->ier & UART_IER_THRI)) { - up->ier |= UART_IER_THRI; - serial_out(up, UART_IER, up->ier); - } -} - -static void serial8250_stop_rx(struct uart_port *port) -{ - struct uart_8250_port *up = (struct uart_8250_port *)port; - - up->ier &= ~UART_IER_RLSI; - up->port.read_status_mask &= ~UART_LSR_DR; - serial_out(up, UART_IER, up->ier); -} - -static void serial8250_enable_ms(struct uart_port *port) -{ - struct uart_8250_port *up = (struct uart_8250_port *)port; - - up->ier |= UART_IER_MSI; - serial_out(up, UART_IER, up->ier); -} - -static void -receive_chars(struct uart_8250_port *up, int *status, struct pt_regs *regs) -{ - struct tty_struct *tty = up->port.info->tty; - unsigned char ch, flag; - int max_count = 256; - - do { - ch = serial_inp(up, UART_RX); - flag = TTY_NORMAL; - up->port.icount.rx++; - - if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE | - UART_LSR_FE | UART_LSR_OE))) { - /* - * For statistics only - */ - if (*status & UART_LSR_BI) { - *status &= ~(UART_LSR_FE | UART_LSR_PE); - up->port.icount.brk++; - /* - * We do the SysRQ and SAK checking - * here because otherwise the break - * may get masked by ignore_status_mask - * or read_status_mask. - */ - if (uart_handle_break(&up->port)) - goto ignore_char; - } else if (*status & UART_LSR_PE) - up->port.icount.parity++; - else if (*status & UART_LSR_FE) - up->port.icount.frame++; - if (*status & UART_LSR_OE) - up->port.icount.overrun++; - - /* - * Mask off conditions which should be ingored. - */ - *status &= up->port.read_status_mask; - -#ifdef CONFIG_SERIAL_AU1X00_CONSOLE - if (up->port.line == up->port.cons->index) { - /* Recover the break flag from console xmit */ - *status |= up->lsr_break_flag; - up->lsr_break_flag = 0; - } -#endif - if (*status & UART_LSR_BI) { - DEBUG_INTR("handling break...."); - flag = TTY_BREAK; - } else if (*status & UART_LSR_PE) - flag = TTY_PARITY; - else if (*status & UART_LSR_FE) - flag = TTY_FRAME; - } - if (uart_handle_sysrq_char(&up->port, ch, regs)) - goto ignore_char; - if ((*status & up->port.ignore_status_mask) == 0) - tty_insert_flip_char(tty, ch, flag); - if (*status & UART_LSR_OE) - /* - * Overrun is special, since it's reported - * immediately, and doesn't affect the current - * character. - */ - tty_insert_flip_char(tty, 0, TTY_OVERRUN); - } - ignore_char: - *status = serial_inp(up, UART_LSR); - } while ((*status & UART_LSR_DR) && (max_count-- > 0)); - spin_unlock(&up->port.lock); - tty_flip_buffer_push(tty); - spin_lock(&up->port.lock); -} - -static void transmit_chars(struct uart_8250_port *up) -{ - struct circ_buf *xmit = &up->port.info->xmit; - int count; - - if (up->port.x_char) { - serial_outp(up, UART_TX, up->port.x_char); - up->port.icount.tx++; - up->port.x_char = 0; - return; - } - if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) { - serial8250_stop_tx(&up->port); - return; - } - - count = up->port.fifosize; - do { - serial_out(up, UART_TX, xmit->buf[xmit->tail]); - xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); - up->port.icount.tx++; - if (uart_circ_empty(xmit)) - break; - } while (--count > 0); - - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) - uart_write_wakeup(&up->port); - - DEBUG_INTR("THRE..."); - - if (uart_circ_empty(xmit)) - serial8250_stop_tx(&up->port); -} - -static void check_modem_status(struct uart_8250_port *up) -{ - int status; - - status = serial_in(up, UART_MSR); - - if ((status & UART_MSR_ANY_DELTA) == 0) - return; - - if (status & UART_MSR_TERI) - up->port.icount.rng++; - if (status & UART_MSR_DDSR) - up->port.icount.dsr++; - if (status & UART_MSR_DDCD) - uart_handle_dcd_change(&up->port, status & UART_MSR_DCD); - if (status & UART_MSR_DCTS) - uart_handle_cts_change(&up->port, status & UART_MSR_CTS); - - wake_up_interruptible(&up->port.info->delta_msr_wait); -} - -/* - * This handles the interrupt from one port. - */ -static inline void -serial8250_handle_port(struct uart_8250_port *up, struct pt_regs *regs) -{ - unsigned int status = serial_inp(up, UART_LSR); - - DEBUG_INTR("status = %x...", status); - - if (status & UART_LSR_DR) - receive_chars(up, &status, regs); - check_modem_status(up); - if (status & UART_LSR_THRE) - transmit_chars(up); -} - -/* - * This is the serial driver's interrupt routine. - * - * Arjan thinks the old way was overly complex, so it got simplified. - * Alan disagrees, saying that need the complexity to handle the weird - * nature of ISA shared interrupts. (This is a special exception.) - * - * In order to handle ISA shared interrupts properly, we need to check - * that all ports have been serviced, and therefore the ISA interrupt - * line has been de-asserted. - * - * This means we need to loop through all ports. checking that they - * don't have an interrupt pending. - */ -static irqreturn_t serial8250_interrupt(int irq, void *dev_id, struct pt_regs *regs) -{ - struct irq_info *i = dev_id; - struct list_head *l, *end = NULL; - int pass_counter = 0; - - DEBUG_INTR("serial8250_interrupt(%d)...", irq); - - spin_lock(&i->lock); - - l = i->head; - do { - struct uart_8250_port *up; - unsigned int iir; - - up = list_entry(l, struct uart_8250_port, list); - - iir = serial_in(up, UART_IIR); - if (!(iir & UART_IIR_NO_INT)) { - spin_lock(&up->port.lock); - serial8250_handle_port(up, regs); - spin_unlock(&up->port.lock); - - end = NULL; - } else if (end == NULL) - end = l; - - l = l->next; - - if (l == i->head && pass_counter++ > PASS_LIMIT) { - /* If we hit this, we're dead. */ - printk(KERN_ERR "serial8250: too much work for " - "irq%d\n", irq); - break; - } - } while (l != end); - - spin_unlock(&i->lock); - - DEBUG_INTR("end.\n"); - /* FIXME! Was it really ours? */ - return IRQ_HANDLED; -} - -/* - * To support ISA shared interrupts, we need to have one interrupt - * handler that ensures that the IRQ line has been deasserted - * before returning. Failing to do this will result in the IRQ - * line being stuck active, and, since ISA irqs are edge triggered, - * no more IRQs will be seen. - */ -static void serial_do_unlink(struct irq_info *i, struct uart_8250_port *up) -{ - spin_lock_irq(&i->lock); - - if (!list_empty(i->head)) { - if (i->head == &up->list) - i->head = i->head->next; - list_del(&up->list); - } else { - BUG_ON(i->head != &up->list); - i->head = NULL; - } - - spin_unlock_irq(&i->lock); -} - -static int serial_link_irq_chain(struct uart_8250_port *up) -{ - struct irq_info *i = irq_lists + up->port.irq; - int ret, irq_flags = up->port.flags & UPF_SHARE_IRQ ? SA_SHIRQ : 0; - - spin_lock_irq(&i->lock); - - if (i->head) { - list_add(&up->list, i->head); - spin_unlock_irq(&i->lock); - - ret = 0; - } else { - INIT_LIST_HEAD(&up->list); - i->head = &up->list; - spin_unlock_irq(&i->lock); - - ret = request_irq(up->port.irq, serial8250_interrupt, - irq_flags, "serial", i); - if (ret < 0) - serial_do_unlink(i, up); - } - - return ret; -} - -static void serial_unlink_irq_chain(struct uart_8250_port *up) -{ - struct irq_info *i = irq_lists + up->port.irq; - - BUG_ON(i->head == NULL); - - if (list_empty(i->head)) - free_irq(up->port.irq, i); - - serial_do_unlink(i, up); -} - -/* - * This function is used to handle ports that do not have an - * interrupt. This doesn't work very well for 16450's, but gives - * barely passable results for a 16550A. (Although at the expense - * of much CPU overhead). - */ -static void serial8250_timeout(unsigned long data) -{ - struct uart_8250_port *up = (struct uart_8250_port *)data; - unsigned int timeout; - unsigned int iir; - - iir = serial_in(up, UART_IIR); - if (!(iir & UART_IIR_NO_INT)) { - spin_lock(&up->port.lock); - serial8250_handle_port(up, NULL); - spin_unlock(&up->port.lock); - } - - timeout = up->port.timeout; - timeout = timeout > 6 ? (timeout / 2 - 2) : 1; - mod_timer(&up->timer, jiffies + timeout); -} - -static unsigned int serial8250_tx_empty(struct uart_port *port) -{ - struct uart_8250_port *up = (struct uart_8250_port *)port; - unsigned long flags; - unsigned int ret; - - spin_lock_irqsave(&up->port.lock, flags); - ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0; - spin_unlock_irqrestore(&up->port.lock, flags); - - return ret; -} - -static unsigned int serial8250_get_mctrl(struct uart_port *port) -{ - struct uart_8250_port *up = (struct uart_8250_port *)port; - unsigned char status; - unsigned int ret; - - status = serial_in(up, UART_MSR); - - ret = 0; - if (status & UART_MSR_DCD) - ret |= TIOCM_CAR; - if (status & UART_MSR_RI) - ret |= TIOCM_RNG; - if (status & UART_MSR_DSR) - ret |= TIOCM_DSR; - if (status & UART_MSR_CTS) - ret |= TIOCM_CTS; - return ret; -} - -static void serial8250_set_mctrl(struct uart_port *port, unsigned int mctrl) -{ - struct uart_8250_port *up = (struct uart_8250_port *)port; - unsigned char mcr = 0; - - if (mctrl & TIOCM_RTS) - mcr |= UART_MCR_RTS; - if (mctrl & TIOCM_DTR) - mcr |= UART_MCR_DTR; - if (mctrl & TIOCM_OUT1) - mcr |= UART_MCR_OUT1; - if (mctrl & TIOCM_OUT2) - mcr |= UART_MCR_OUT2; - if (mctrl & TIOCM_LOOP) - mcr |= UART_MCR_LOOP; - - mcr = (mcr & up->mcr_mask) | up->mcr_force; - - serial_out(up, UART_MCR, mcr); -} - -static void serial8250_break_ctl(struct uart_port *port, int break_state) -{ - struct uart_8250_port *up = (struct uart_8250_port *)port; - unsigned long flags; - - spin_lock_irqsave(&up->port.lock, flags); - if (break_state == -1) - up->lcr |= UART_LCR_SBC; - else - up->lcr &= ~UART_LCR_SBC; - serial_out(up, UART_LCR, up->lcr); - spin_unlock_irqrestore(&up->port.lock, flags); -} - -static int serial8250_startup(struct uart_port *port) -{ - struct uart_8250_port *up = (struct uart_8250_port *)port; - unsigned long flags; - int retval; - - /* - * Clear the FIFO buffers and disable them. - * (they will be reeanbled in set_termios()) - */ - if (uart_config[up->port.type].flags & UART_CLEAR_FIFO) { - serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO); - serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO | - UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); - serial_outp(up, UART_FCR, 0); - } - - /* - * Clear the interrupt registers. - */ - (void) serial_inp(up, UART_LSR); - (void) serial_inp(up, UART_RX); - (void) serial_inp(up, UART_IIR); - (void) serial_inp(up, UART_MSR); - - /* - * At this point, there's no way the LSR could still be 0xff; - * if it is, then bail out, because there's likely no UART - * here. - */ - if (!(up->port.flags & UPF_BUGGY_UART) && - (serial_inp(up, UART_LSR) == 0xff)) { - printk("ttyS%d: LSR safety check engaged!\n", up->port.line); - return -ENODEV; - } - - retval = serial_link_irq_chain(up); - if (retval) - return retval; - - /* - * Now, initialize the UART - */ - serial_outp(up, UART_LCR, UART_LCR_WLEN8); - - spin_lock_irqsave(&up->port.lock, flags); - if (up->port.flags & UPF_FOURPORT) { - if (!is_real_interrupt(up->port.irq)) - up->port.mctrl |= TIOCM_OUT1; - } else - /* - * Most PC uarts need OUT2 raised to enable interrupts. - */ - if (is_real_interrupt(up->port.irq)) - up->port.mctrl |= TIOCM_OUT2; - - serial8250_set_mctrl(&up->port, up->port.mctrl); - spin_unlock_irqrestore(&up->port.lock, flags); - - /* - * Finally, enable interrupts. Note: Modem status interrupts - * are set via set_termios(), which will be occurring imminently - * anyway, so we don't enable them here. - */ - up->ier = UART_IER_RLSI | UART_IER_RDI; - serial_outp(up, UART_IER, up->ier); - - if (up->port.flags & UPF_FOURPORT) { - unsigned int icp; - /* - * Enable interrupts on the AST Fourport board - */ - icp = (up->port.iobase & 0xfe0) | 0x01f; - outb_p(0x80, icp); - (void) inb_p(icp); - } - - /* - * And clear the interrupt registers again for luck. - */ - (void) serial_inp(up, UART_LSR); - (void) serial_inp(up, UART_RX); - (void) serial_inp(up, UART_IIR); - (void) serial_inp(up, UART_MSR); - - return 0; -} - -static void serial8250_shutdown(struct uart_port *port) -{ - struct uart_8250_port *up = (struct uart_8250_port *)port; - unsigned long flags; - - /* - * Disable interrupts from this port - */ - up->ier = 0; - serial_outp(up, UART_IER, 0); - - spin_lock_irqsave(&up->port.lock, flags); - if (up->port.flags & UPF_FOURPORT) { - /* reset interrupts on the AST Fourport board */ - inb((up->port.iobase & 0xfe0) | 0x1f); - up->port.mctrl |= TIOCM_OUT1; - } else - up->port.mctrl &= ~TIOCM_OUT2; - - serial8250_set_mctrl(&up->port, up->port.mctrl); - spin_unlock_irqrestore(&up->port.lock, flags); - - /* - * Disable break condition and FIFOs - */ - serial_out(up, UART_LCR, serial_inp(up, UART_LCR) & ~UART_LCR_SBC); - serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO | - UART_FCR_CLEAR_RCVR | - UART_FCR_CLEAR_XMIT); - serial_outp(up, UART_FCR, 0); - - /* - * Read data port to reset things, and then unlink from - * the IRQ chain. - */ - (void) serial_in(up, UART_RX); - - if (!is_real_interrupt(up->port.irq)) - del_timer_sync(&up->timer); - else - serial_unlink_irq_chain(up); -} - -static unsigned int serial8250_get_divisor(struct uart_port *port, unsigned int baud) -{ - unsigned int quot; - - /* - * Handle magic divisors for baud rates above baud_base on - * SMSC SuperIO chips. - */ - if ((port->flags & UPF_MAGIC_MULTIPLIER) && - baud == (port->uartclk/4)) - quot = 0x8001; - else if ((port->flags & UPF_MAGIC_MULTIPLIER) && - baud == (port->uartclk/8)) - quot = 0x8002; - else - quot = uart_get_divisor(port, baud); - - return quot; -} - -static void -serial8250_set_termios(struct uart_port *port, struct termios *termios, - struct termios *old) -{ - struct uart_8250_port *up = (struct uart_8250_port *)port; - unsigned char cval, fcr = 0; - unsigned long flags; - unsigned int baud, quot; - - switch (termios->c_cflag & CSIZE) { - case CS5: - cval = UART_LCR_WLEN5; - break; - case CS6: - cval = UART_LCR_WLEN6; - break; - case CS7: - cval = UART_LCR_WLEN7; - break; - default: - case CS8: - cval = UART_LCR_WLEN8; - break; - } - - if (termios->c_cflag & CSTOPB) - cval |= UART_LCR_STOP; - if (termios->c_cflag & PARENB) - cval |= UART_LCR_PARITY; - if (!(termios->c_cflag & PARODD)) - cval |= UART_LCR_EPAR; -#ifdef CMSPAR - if (termios->c_cflag & CMSPAR) - cval |= UART_LCR_SPAR; -#endif - - /* - * Ask the core to calculate the divisor for us. - */ - baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); - quot = serial8250_get_divisor(port, baud); - quot = 0x35; /* FIXME */ - - /* - * Work around a bug in the Oxford Semiconductor 952 rev B - * chip which causes it to seriously miscalculate baud rates - * when DLL is 0. - */ - if ((quot & 0xff) == 0 && up->port.type == PORT_16C950 && - up->rev == 0x5201) - quot ++; - - if (uart_config[up->port.type].flags & UART_USE_FIFO) { - if (baud < 2400) - fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIGGER_1; - else - fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIGGER_8; - } - - /* - * Ok, we're now changing the port state. Do it with - * interrupts disabled. - */ - spin_lock_irqsave(&up->port.lock, flags); - - /* - * Update the per-port timeout. - */ - uart_update_timeout(port, termios->c_cflag, baud); - - up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; - if (termios->c_iflag & INPCK) - up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE; - if (termios->c_iflag & (BRKINT | PARMRK)) - up->port.read_status_mask |= UART_LSR_BI; - - /* - * Characteres to ignore - */ - up->port.ignore_status_mask = 0; - if (termios->c_iflag & IGNPAR) - up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; - if (termios->c_iflag & IGNBRK) { - up->port.ignore_status_mask |= UART_LSR_BI; - /* - * If we're ignoring parity and break indicators, - * ignore overruns too (for real raw support). - */ - if (termios->c_iflag & IGNPAR) - up->port.ignore_status_mask |= UART_LSR_OE; - } - - /* - * ignore all characters if CREAD is not set - */ - if ((termios->c_cflag & CREAD) == 0) - up->port.ignore_status_mask |= UART_LSR_DR; - - /* - * CTS flow control flag and modem status interrupts - */ - up->ier &= ~UART_IER_MSI; - if (UART_ENABLE_MS(&up->port, termios->c_cflag)) - up->ier |= UART_IER_MSI; - - serial_out(up, UART_IER, up->ier); - serial_outp(up, 0x28, quot & 0xffff); - up->lcr = cval; /* Save LCR */ - if (up->port.type != PORT_16750) { - if (fcr & UART_FCR_ENABLE_FIFO) { - /* emulated UARTs (Lucent Venus 167x) need two steps */ - serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO); - } - serial_outp(up, UART_FCR, fcr); /* set fcr */ - } - spin_unlock_irqrestore(&up->port.lock, flags); -} - -static void -serial8250_pm(struct uart_port *port, unsigned int state, - unsigned int oldstate) -{ - struct uart_8250_port *up = (struct uart_8250_port *)port; - if (state) { - /* sleep */ - if (up->pm) - up->pm(port, state, oldstate); - } else { - /* wake */ - if (up->pm) - up->pm(port, state, oldstate); - } -} - -/* - * Resource handling. This is complicated by the fact that resources - * depend on the port type. Maybe we should be claiming the standard - * 8250 ports, and then trying to get other resources as necessary? - */ -static int -serial8250_request_std_resource(struct uart_8250_port *up, struct resource **res) -{ - unsigned int size = 8 << up->port.regshift; - int ret = 0; - - switch (up->port.iotype) { - case UPIO_MEM: - if (up->port.mapbase) { - *res = request_mem_region(up->port.mapbase, size, "serial"); - if (!*res) - ret = -EBUSY; - } - break; - - case UPIO_HUB6: - case UPIO_PORT: - *res = request_region(up->port.iobase, size, "serial"); - if (!*res) - ret = -EBUSY; - break; - } - return ret; -} - - -static void serial8250_release_port(struct uart_port *port) -{ - struct uart_8250_port *up = (struct uart_8250_port *)port; - unsigned long start, offset = 0, size = 0; - - size <<= up->port.regshift; - - switch (up->port.iotype) { - case UPIO_MEM: - if (up->port.mapbase) { - /* - * Unmap the area. - */ - iounmap(up->port.membase); - up->port.membase = NULL; - - start = up->port.mapbase; - - if (size) - release_mem_region(start + offset, size); - release_mem_region(start, 8 << up->port.regshift); - } - break; - - case UPIO_HUB6: - case UPIO_PORT: - start = up->port.iobase; - - if (size) - release_region(start + offset, size); - release_region(start + offset, 8 << up->port.regshift); - break; - - default: - break; - } -} - -static int serial8250_request_port(struct uart_port *port) -{ - struct uart_8250_port *up = (struct uart_8250_port *)port; - struct resource *res = NULL, *res_rsa = NULL; - int ret = 0; - - ret = serial8250_request_std_resource(up, &res); - - /* - * If we have a mapbase, then request that as well. - */ - if (ret == 0 && up->port.flags & UPF_IOREMAP) { - int size = res->end - res->start + 1; - - up->port.membase = ioremap(up->port.mapbase, size); - if (!up->port.membase) - ret = -ENOMEM; - } - - if (ret < 0) { - if (res_rsa) - release_resource(res_rsa); - if (res) - release_resource(res); - } - return ret; -} - -static void serial8250_config_port(struct uart_port *port, int flags) -{ - struct uart_8250_port *up = (struct uart_8250_port *)port; - struct resource *res_std = NULL, *res_rsa = NULL; - int probeflags = PROBE_ANY; - - probeflags &= ~PROBE_RSA; - - if (flags & UART_CONFIG_TYPE) - autoconfig(up, probeflags); - - /* - * If the port wasn't an RSA port, release the resource. - */ - if (up->port.type != PORT_RSA && res_rsa) - release_resource(res_rsa); - - if (up->port.type == PORT_UNKNOWN && res_std) - release_resource(res_std); -} - -static int -serial8250_verify_port(struct uart_port *port, struct serial_struct *ser) -{ - if (ser->irq >= NR_IRQS || ser->irq < 0 || - ser->baud_base < 9600 || ser->type < PORT_UNKNOWN || - ser->type > PORT_MAX_8250 || ser->type == PORT_CIRRUS || - ser->type == PORT_STARTECH) - return -EINVAL; - return 0; -} - -static const char * -serial8250_type(struct uart_port *port) -{ - int type = port->type; - - if (type >= ARRAY_SIZE(uart_config)) - type = 0; - return uart_config[type].name; -} - -static struct uart_ops serial8250_pops = { - .tx_empty = serial8250_tx_empty, - .set_mctrl = serial8250_set_mctrl, - .get_mctrl = serial8250_get_mctrl, - .stop_tx = serial8250_stop_tx, - .start_tx = serial8250_start_tx, - .stop_rx = serial8250_stop_rx, - .enable_ms = serial8250_enable_ms, - .break_ctl = serial8250_break_ctl, - .startup = serial8250_startup, - .shutdown = serial8250_shutdown, - .set_termios = serial8250_set_termios, - .pm = serial8250_pm, - .type = serial8250_type, - .release_port = serial8250_release_port, - .request_port = serial8250_request_port, - .config_port = serial8250_config_port, - .verify_port = serial8250_verify_port, -}; - -static struct uart_8250_port serial8250_ports[UART_NR]; - -static void __init serial8250_isa_init_ports(void) -{ - struct uart_8250_port *up; - static int first = 1; - int i; - - if (!first) - return; - first = 0; - - for (i = 0, up = serial8250_ports; i < ARRAY_SIZE(old_serial_port); - i++, up++) { - up->port.iobase = old_serial_port[i].port; - up->port.irq = old_serial_port[i].irq; - up->port.uartclk = get_au1x00_uart_baud_base(); - up->port.flags = old_serial_port[i].flags; - up->port.hub6 = old_serial_port[i].hub6; - up->port.membase = old_serial_port[i].iomem_base; - up->port.iotype = old_serial_port[i].io_type; - up->port.regshift = old_serial_port[i].iomem_reg_shift; - up->port.ops = &serial8250_pops; - } -} - -static void __init serial8250_register_ports(struct uart_driver *drv) -{ - int i; - - serial8250_isa_init_ports(); - - for (i = 0; i < UART_NR; i++) { - struct uart_8250_port *up = &serial8250_ports[i]; - - up->port.line = i; - up->port.ops = &serial8250_pops; - init_timer(&up->timer); - up->timer.function = serial8250_timeout; - - /* - * ALPHA_KLUDGE_MCR needs to be killed. - */ - up->mcr_mask = ~ALPHA_KLUDGE_MCR; - up->mcr_force = ALPHA_KLUDGE_MCR; - - uart_add_one_port(drv, &up->port); - } -} - -#ifdef CONFIG_SERIAL_AU1X00_CONSOLE - -#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) - -/* - * Wait for transmitter & holding register to empty - */ -static inline void wait_for_xmitr(struct uart_8250_port *up) -{ - unsigned int status, tmout = 10000; - - /* Wait up to 10ms for the character(s) to be sent. */ - do { - status = serial_in(up, UART_LSR); - - if (status & UART_LSR_BI) - up->lsr_break_flag = UART_LSR_BI; - - if (--tmout == 0) - break; - udelay(1); - } while ((status & BOTH_EMPTY) != BOTH_EMPTY); - - /* Wait up to 1s for flow control if necessary */ - if (up->port.flags & UPF_CONS_FLOW) { - tmout = 1000000; - while (--tmout && - ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0)) - udelay(1); - } -} - -static void au1x00_console_putchar(struct uart_port *port, int ch) -{ - struct uart_8250_port *up = (struct uart_8250_port *)port; - - wait_for_xmitr(up); - serial_out(up, UART_TX, ch); -} - -/* - * Print a string to the serial port trying not to disturb - * any possible real use of the port... - * - * The console_lock must be held when we get here. - */ -static void -serial8250_console_write(struct console *co, const char *s, unsigned int count) -{ - struct uart_8250_port *up = &serial8250_ports[co->index]; - unsigned int ier; - - /* - * First save the UER then disable the interrupts - */ - ier = serial_in(up, UART_IER); - serial_out(up, UART_IER, 0); - - uart_console_write(&up->port, s, count, au1x00_console_putchar); - - /* - * Finally, wait for transmitter to become empty - * and restore the IER - */ - wait_for_xmitr(up); - serial_out(up, UART_IER, ier); -} - -static int __init serial8250_console_setup(struct console *co, char *options) -{ - struct uart_port *port; - int baud = 9600; - int bits = 8; - int parity = 'n'; - int flow = 'n'; - - /* - * Check whether an invalid uart number has been specified, and - * if so, search for the first available port that does have - * console support. - */ - if (co->index >= UART_NR) - co->index = 0; - port = &serial8250_ports[co->index].port; - - /* - * Temporary fix. - */ - spin_lock_init(&port->lock); - - if (options) - uart_parse_options(options, &baud, &parity, &bits, &flow); - - return uart_set_options(port, co, baud, parity, bits, flow); -} - -extern struct uart_driver serial8250_reg; -static struct console serial8250_console = { - .name = "ttyS", - .write = serial8250_console_write, - .device = uart_console_device, - .setup = serial8250_console_setup, - .flags = CON_PRINTBUFFER, - .index = -1, - .data = &serial8250_reg, -}; - -static int __init serial8250_console_init(void) -{ - serial8250_isa_init_ports(); - register_console(&serial8250_console); - return 0; -} -console_initcall(serial8250_console_init); - -#define SERIAL8250_CONSOLE &serial8250_console -#else -#define SERIAL8250_CONSOLE NULL -#endif - -static struct uart_driver serial8250_reg = { - .owner = THIS_MODULE, - .driver_name = "serial", - .devfs_name = "tts/", - .dev_name = "ttyS", - .major = TTY_MAJOR, - .minor = 64, - .nr = UART_NR, - .cons = SERIAL8250_CONSOLE, -}; - -int __init early_serial_setup(struct uart_port *port) -{ - serial8250_isa_init_ports(); - serial8250_ports[port->line].port = *port; - serial8250_ports[port->line].port.ops = &serial8250_pops; - return 0; -} - -/** - * serial8250_suspend_port - suspend one serial port - * @line: serial line number - * @level: the level of port suspension, as per uart_suspend_port - * - * Suspend one serial port. - */ -void serial8250_suspend_port(int line) -{ - uart_suspend_port(&serial8250_reg, &serial8250_ports[line].port); -} - -/** - * serial8250_resume_port - resume one serial port - * @line: serial line number - * @level: the level of port resumption, as per uart_resume_port - * - * Resume one serial port. - */ -void serial8250_resume_port(int line) -{ - uart_resume_port(&serial8250_reg, &serial8250_ports[line].port); -} - -static int __init serial8250_init(void) -{ - int ret, i; - - printk(KERN_INFO "Serial: Au1x00 driver\n"); - - for (i = 0; i < NR_IRQS; i++) - spin_lock_init(&irq_lists[i].lock); - - ret = uart_register_driver(&serial8250_reg); - if (ret >= 0) - serial8250_register_ports(&serial8250_reg); - - return ret; -} - -static void __exit serial8250_exit(void) -{ - int i; - - for (i = 0; i < UART_NR; i++) - uart_remove_one_port(&serial8250_reg, &serial8250_ports[i].port); - - uart_unregister_driver(&serial8250_reg); -} - -module_init(serial8250_init); -module_exit(serial8250_exit); - -EXPORT_SYMBOL(serial8250_suspend_port); -EXPORT_SYMBOL(serial8250_resume_port); - -MODULE_LICENSE("GPL"); -MODULE_DESCRIPTION("Au1x00 serial driver\n"); |