diff options
Diffstat (limited to 'drivers/serial/uart00.c')
| -rw-r--r-- | drivers/serial/uart00.c | 782 |
1 files changed, 0 insertions, 782 deletions
diff --git a/drivers/serial/uart00.c b/drivers/serial/uart00.c deleted file mode 100644 index 47b504ff38b2..000000000000 --- a/drivers/serial/uart00.c +++ /dev/null @@ -1,782 +0,0 @@ -/* - * linux/drivers/serial/uart00.c - * - * Driver for UART00 serial ports - * - * Based on drivers/char/serial_amba.c, by ARM Limited & - * Deep Blue Solutions Ltd. - * Copyright 2001 Altera Corporation - * - * Update for 2.6.4 by Dirk Behme <dirk.behme@de.bosch.com> - * - * 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. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * - * $Id: uart00.c,v 1.35 2002/07/28 10:03:28 rmk Exp $ - * - */ -#include <linux/config.h> - -#if defined(CONFIG_SERIAL_UART00_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) -#define SUPPORT_SYSRQ -#endif - -#include <linux/module.h> -#include <linux/ioport.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> -#include <linux/serial.h> - -#include <asm/io.h> -#include <asm/irq.h> -#include <asm/sizes.h> - -#include <asm/arch/excalibur.h> -#define UART00_TYPE (volatile unsigned int*) -#include <asm/arch/uart00.h> -#include <asm/arch/int_ctrl00.h> - -#define UART_NR 2 - -#define SERIAL_UART00_NAME "ttyUA" -#define SERIAL_UART00_MAJOR 204 -#define SERIAL_UART00_MINOR 16 /* Temporary - will change in future */ -#define SERIAL_UART00_NR UART_NR -#define UART_PORT_SIZE 0x50 - -#define UART00_ISR_PASS_LIMIT 256 - -/* - * Access macros for the UART00 UARTs - */ -#define UART_GET_INT_STATUS(p) inl(UART_ISR((p)->membase)) -#define UART_PUT_IES(p, c) outl(c,UART_IES((p)->membase)) -#define UART_GET_IES(p) inl(UART_IES((p)->membase)) -#define UART_PUT_IEC(p, c) outl(c,UART_IEC((p)->membase)) -#define UART_GET_IEC(p) inl(UART_IEC((p)->membase)) -#define UART_PUT_CHAR(p, c) outl(c,UART_TD((p)->membase)) -#define UART_GET_CHAR(p) inl(UART_RD((p)->membase)) -#define UART_GET_RSR(p) inl(UART_RSR((p)->membase)) -#define UART_GET_RDS(p) inl(UART_RDS((p)->membase)) -#define UART_GET_MSR(p) inl(UART_MSR((p)->membase)) -#define UART_GET_MCR(p) inl(UART_MCR((p)->membase)) -#define UART_PUT_MCR(p, c) outl(c,UART_MCR((p)->membase)) -#define UART_GET_MC(p) inl(UART_MC((p)->membase)) -#define UART_PUT_MC(p, c) outl(c,UART_MC((p)->membase)) -#define UART_GET_TSR(p) inl(UART_TSR((p)->membase)) -#define UART_GET_DIV_HI(p) inl(UART_DIV_HI((p)->membase)) -#define UART_PUT_DIV_HI(p,c) outl(c,UART_DIV_HI((p)->membase)) -#define UART_GET_DIV_LO(p) inl(UART_DIV_LO((p)->membase)) -#define UART_PUT_DIV_LO(p,c) outl(c,UART_DIV_LO((p)->membase)) -#define UART_RX_DATA(s) ((s) & UART_RSR_RX_LEVEL_MSK) -#define UART_TX_READY(s) (((s) & UART_TSR_TX_LEVEL_MSK) < 15) -//#define UART_TX_EMPTY(p) ((UART_GET_FR(p) & UART00_UARTFR_TMSK) == 0) - -static void uart00_stop_tx(struct uart_port *port) -{ - UART_PUT_IEC(port, UART_IEC_TIE_MSK); -} - -static void uart00_stop_rx(struct uart_port *port) -{ - UART_PUT_IEC(port, UART_IEC_RE_MSK); -} - -static void uart00_enable_ms(struct uart_port *port) -{ - UART_PUT_IES(port, UART_IES_ME_MSK); -} - -static void -uart00_rx_chars(struct uart_port *port, struct pt_regs *regs) -{ - struct tty_struct *tty = port->info->tty; - unsigned int status, ch, rds, flg, ignored = 0; - - status = UART_GET_RSR(port); - while (UART_RX_DATA(status)) { - /* - * We need to read rds before reading the - * character from the fifo - */ - rds = UART_GET_RDS(port); - ch = UART_GET_CHAR(port); - port->icount.rx++; - - if (tty->flip.count >= TTY_FLIPBUF_SIZE) - goto ignore_char; - - flg = TTY_NORMAL; - - /* - * Note that the error handling code is - * out of the main execution path - */ - if (rds & (UART_RDS_BI_MSK |UART_RDS_FE_MSK| - UART_RDS_PE_MSK |UART_RDS_PE_MSK)) - goto handle_error; - if (uart_handle_sysrq_char(port, ch, regs)) - goto ignore_char; - - error_return: - tty_insert_flip_char(tty, ch, flg); - - ignore_char: - status = UART_GET_RSR(port); - } - out: - tty_flip_buffer_push(tty); - return; - - handle_error: - if (rds & UART_RDS_BI_MSK) { - status &= ~(UART_RDS_FE_MSK | UART_RDS_PE_MSK); - port->icount.brk++; - if (uart_handle_break(port)) - goto ignore_char; - } else if (rds & UART_RDS_PE_MSK) - port->icount.parity++; - else if (rds & UART_RDS_FE_MSK) - port->icount.frame++; - if (rds & UART_RDS_OE_MSK) - port->icount.overrun++; - - if (rds & port->ignore_status_mask) { - if (++ignored > 100) - goto out; - goto ignore_char; - } - rds &= port->read_status_mask; - - if (rds & UART_RDS_BI_MSK) - flg = TTY_BREAK; - else if (rds & UART_RDS_PE_MSK) - flg = TTY_PARITY; - else if (rds & UART_RDS_FE_MSK) - flg = TTY_FRAME; - - if (rds & UART_RDS_OE_MSK) { - /* - * CHECK: does overrun affect the current character? - * ASSUMPTION: it does not. - */ - tty_insert_flip_char(tty, ch, flg); - ch = 0; - flg = TTY_OVERRUN; - } -#ifdef SUPPORT_SYSRQ - port->sysrq = 0; -#endif - goto error_return; -} - -static void uart00_tx_chars(struct uart_port *port) -{ - struct circ_buf *xmit = &port->info->xmit; - int count; - - if (port->x_char) { - while ((UART_GET_TSR(port) & UART_TSR_TX_LEVEL_MSK) == 15) - barrier(); - UART_PUT_CHAR(port, port->x_char); - port->icount.tx++; - port->x_char = 0; - return; - } - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { - uart00_stop_tx(port); - return; - } - - count = port->fifosize >> 1; - do { - while ((UART_GET_TSR(port) & UART_TSR_TX_LEVEL_MSK) == 15) - barrier(); - UART_PUT_CHAR(port, xmit->buf[xmit->tail]); - xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); - port->icount.tx++; - if (uart_circ_empty(xmit)) - break; - } while (--count > 0); - - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) - uart_write_wakeup(port); - - if (uart_circ_empty(xmit)) - uart00_stop_tx(port); -} - -static void uart00_start_tx(struct uart_port *port) -{ - UART_PUT_IES(port, UART_IES_TIE_MSK); - uart00_tx_chars(port); -} - -static void uart00_modem_status(struct uart_port *port) -{ - unsigned int status; - - status = UART_GET_MSR(port); - - if (!(status & (UART_MSR_DCTS_MSK | UART_MSR_DDSR_MSK | - UART_MSR_TERI_MSK | UART_MSR_DDCD_MSK))) - return; - - if (status & UART_MSR_DDCD_MSK) - uart_handle_dcd_change(port, status & UART_MSR_DCD_MSK); - - if (status & UART_MSR_DDSR_MSK) - port->icount.dsr++; - - if (status & UART_MSR_DCTS_MSK) - uart_handle_cts_change(port, status & UART_MSR_CTS_MSK); - - wake_up_interruptible(&port->info->delta_msr_wait); -} - -static irqreturn_t uart00_int(int irq, void *dev_id, struct pt_regs *regs) -{ - struct uart_port *port = dev_id; - unsigned int status, pass_counter = 0; - - status = UART_GET_INT_STATUS(port); - do { - if (status & UART_ISR_RI_MSK) - uart00_rx_chars(port, regs); - if (status & UART_ISR_MI_MSK) - uart00_modem_status(port); - if (status & (UART_ISR_TI_MSK | UART_ISR_TII_MSK)) - uart00_tx_chars(port); - if (pass_counter++ > UART00_ISR_PASS_LIMIT) - break; - - status = UART_GET_INT_STATUS(port); - } while (status); - - return IRQ_HANDLED; -} - -static unsigned int uart00_tx_empty(struct uart_port *port) -{ - return UART_GET_TSR(port) & UART_TSR_TX_LEVEL_MSK? 0 : TIOCSER_TEMT; -} - -static unsigned int uart00_get_mctrl(struct uart_port *port) -{ - unsigned int result = 0; - unsigned int status; - - status = UART_GET_MSR(port); - if (status & UART_MSR_DCD_MSK) - result |= TIOCM_CAR; - if (status & UART_MSR_DSR_MSK) - result |= TIOCM_DSR; - if (status & UART_MSR_CTS_MSK) - result |= TIOCM_CTS; - if (status & UART_MSR_RI_MSK) - result |= TIOCM_RI; - - return result; -} - -static void uart00_set_mctrl_null(struct uart_port *port, unsigned int mctrl) -{ -} - -static void uart00_break_ctl(struct uart_port *port, int break_state) -{ - unsigned long flags; - unsigned int mcr; - - spin_lock_irqsave(&port->lock, flags); - mcr = UART_GET_MCR(port); - if (break_state == -1) - mcr |= UART_MCR_BR_MSK; - else - mcr &= ~UART_MCR_BR_MSK; - UART_PUT_MCR(port, mcr); - spin_unlock_irqrestore(&port->lock, flags); -} - -static void -uart00_set_termios(struct uart_port *port, struct termios *termios, - struct termios *old) -{ - unsigned int uart_mc, old_ies, baud, quot; - unsigned long flags; - - /* - * We don't support CREAD (yet) - */ - termios->c_cflag |= CREAD; - - /* - * Ask the core to calculate the divisor for us. - */ - baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); - quot = uart_get_divisor(port, baud); - - /* byte size and parity */ - switch (termios->c_cflag & CSIZE) { - case CS5: - uart_mc = UART_MC_CLS_CHARLEN_5; - break; - case CS6: - uart_mc = UART_MC_CLS_CHARLEN_6; - break; - case CS7: - uart_mc = UART_MC_CLS_CHARLEN_7; - break; - default: // CS8 - uart_mc = UART_MC_CLS_CHARLEN_8; - break; - } - if (termios->c_cflag & CSTOPB) - uart_mc|= UART_MC_ST_TWO; - if (termios->c_cflag & PARENB) { - uart_mc |= UART_MC_PE_MSK; - if (!(termios->c_cflag & PARODD)) - uart_mc |= UART_MC_EP_MSK; - } - - spin_lock_irqsave(&port->lock, flags); - - /* - * Update the per-port timeout. - */ - uart_update_timeout(port, termios->c_cflag, baud); - - port->read_status_mask = UART_RDS_OE_MSK; - if (termios->c_iflag & INPCK) - port->read_status_mask |= UART_RDS_FE_MSK | UART_RDS_PE_MSK; - if (termios->c_iflag & (BRKINT | PARMRK)) - port->read_status_mask |= UART_RDS_BI_MSK; - - /* - * Characters to ignore - */ - port->ignore_status_mask = 0; - if (termios->c_iflag & IGNPAR) - port->ignore_status_mask |= UART_RDS_FE_MSK | UART_RDS_PE_MSK; - if (termios->c_iflag & IGNBRK) { - port->ignore_status_mask |= UART_RDS_BI_MSK; - /* - * If we're ignoring parity and break indicators, - * ignore overruns to (for real raw support). - */ - if (termios->c_iflag & IGNPAR) - port->ignore_status_mask |= UART_RDS_OE_MSK; - } - - /* first, disable everything */ - old_ies = UART_GET_IES(port); - - if (UART_ENABLE_MS(port, termios->c_cflag)) - old_ies |= UART_IES_ME_MSK; - - /* Set baud rate */ - UART_PUT_DIV_LO(port, (quot & 0xff)); - UART_PUT_DIV_HI(port, ((quot & 0xf00) >> 8)); - - UART_PUT_MC(port, uart_mc); - UART_PUT_IES(port, old_ies); - - spin_unlock_irqrestore(&port->lock, flags); -} - -static int uart00_startup(struct uart_port *port) -{ - int result; - - /* - * Allocate the IRQ - */ - result = request_irq(port->irq, uart00_int, 0, "uart00", port); - if (result) { - printk(KERN_ERR "Request of irq %d failed\n", port->irq); - return result; - } - - /* - * Finally, enable interrupts. Use the TII interrupt to minimise - * the number of interrupts generated. If higher performance is - * needed, consider using the TI interrupt with a suitable FIFO - * threshold - */ - UART_PUT_IES(port, UART_IES_RE_MSK | UART_IES_TIE_MSK); - - return 0; -} - -static void uart00_shutdown(struct uart_port *port) -{ - /* - * disable all interrupts, disable the port - */ - UART_PUT_IEC(port, 0xff); - - /* disable break condition and fifos */ - UART_PUT_MCR(port, UART_GET_MCR(port) &~UART_MCR_BR_MSK); - - /* - * Free the interrupt - */ - free_irq(port->irq, port); -} - -static const char *uart00_type(struct uart_port *port) -{ - return port->type == PORT_UART00 ? "Altera UART00" : NULL; -} - -/* - * Release the memory region(s) being used by 'port' - */ -static void uart00_release_port(struct uart_port *port) -{ - release_mem_region(port->mapbase, UART_PORT_SIZE); - -#ifdef CONFIG_ARCH_CAMELOT - if (port->membase != (void*)IO_ADDRESS(EXC_UART00_BASE)) { - iounmap(port->membase); - } -#endif -} - -/* - * Request the memory region(s) being used by 'port' - */ -static int uart00_request_port(struct uart_port *port) -{ - return request_mem_region(port->mapbase, UART_PORT_SIZE, "serial_uart00") - != NULL ? 0 : -EBUSY; -} - -/* - * Configure/autoconfigure the port. - */ -static void uart00_config_port(struct uart_port *port, int flags) -{ - - /* - * Map the io memory if this is a soft uart - */ - if (!port->membase) - port->membase = ioremap_nocache(port->mapbase,SZ_4K); - - if (!port->membase) - printk(KERN_ERR "serial00: cannot map io memory\n"); - else - port->type = PORT_UART00; - -} - -/* - * verify the new serial_struct (for TIOCSSERIAL). - */ -static int uart00_verify_port(struct uart_port *port, struct serial_struct *ser) -{ - int ret = 0; - if (ser->type != PORT_UNKNOWN && ser->type != PORT_UART00) - ret = -EINVAL; - if (ser->irq < 0 || ser->irq >= NR_IRQS) - ret = -EINVAL; - if (ser->baud_base < 9600) - ret = -EINVAL; - return ret; -} - -static struct uart_ops uart00_pops = { - .tx_empty = uart00_tx_empty, - .set_mctrl = uart00_set_mctrl_null, - .get_mctrl = uart00_get_mctrl, - .stop_tx = uart00_stop_tx, - .start_tx = uart00_start_tx, - .stop_rx = uart00_stop_rx, - .enable_ms = uart00_enable_ms, - .break_ctl = uart00_break_ctl, - .startup = uart00_startup, - .shutdown = uart00_shutdown, - .set_termios = uart00_set_termios, - .type = uart00_type, - .release_port = uart00_release_port, - .request_port = uart00_request_port, - .config_port = uart00_config_port, - .verify_port = uart00_verify_port, -}; - - -#ifdef CONFIG_ARCH_CAMELOT -static struct uart_port epxa10db_port = { - .membase = (void*)IO_ADDRESS(EXC_UART00_BASE), - .mapbase = EXC_UART00_BASE, - .iotype = SERIAL_IO_MEM, - .irq = IRQ_UART, - .uartclk = EXC_AHB2_CLK_FREQUENCY, - .fifosize = 16, - .ops = &uart00_pops, - .flags = ASYNC_BOOT_AUTOCONF, -}; -#endif - - -#ifdef CONFIG_SERIAL_UART00_CONSOLE -static void uart00_console_write(struct console *co, const char *s, unsigned count) -{ -#ifdef CONFIG_ARCH_CAMELOT - struct uart_port *port = &epxa10db_port; - unsigned int status, old_ies; - int i; - - /* - * First save the CR then disable the interrupts - */ - old_ies = UART_GET_IES(port); - UART_PUT_IEC(port,0xff); - - /* - * Now, do each character - */ - for (i = 0; i < count; i++) { - do { - status = UART_GET_TSR(port); - } while (!UART_TX_READY(status)); - UART_PUT_CHAR(port, s[i]); - if (s[i] == '\n') { - do { - status = UART_GET_TSR(port); - } while (!UART_TX_READY(status)); - UART_PUT_CHAR(port, '\r'); - } - } - - /* - * Finally, wait for transmitter to become empty - * and restore the IES - */ - do { - status = UART_GET_TSR(port); - } while (status & UART_TSR_TX_LEVEL_MSK); - UART_PUT_IES(port, old_ies); -#endif -} - -static void __init -uart00_console_get_options(struct uart_port *port, int *baud, - int *parity, int *bits) -{ - unsigned int uart_mc, quot; - - uart_mc = UART_GET_MC(port); - - *parity = 'n'; - if (uart_mc & UART_MC_PE_MSK) { - if (uart_mc & UART_MC_EP_MSK) - *parity = 'e'; - else - *parity = 'o'; - } - - switch (uart_mc & UART_MC_CLS_MSK) { - case UART_MC_CLS_CHARLEN_5: - *bits = 5; - break; - case UART_MC_CLS_CHARLEN_6: - *bits = 6; - break; - case UART_MC_CLS_CHARLEN_7: - *bits = 7; - break; - case UART_MC_CLS_CHARLEN_8: - *bits = 8; - break; - } - quot = UART_GET_DIV_LO(port) | (UART_GET_DIV_HI(port) << 8); - *baud = port->uartclk / (16 *quot ); -} - -static int __init uart00_console_setup(struct console *co, char *options) -{ - struct uart_port *port; - int baud = 115200; - int bits = 8; - int parity = 'n'; - int flow = 'n'; - -#ifdef CONFIG_ARCH_CAMELOT - port = &epxa10db_port; ; -#else - return -ENODEV; -#endif - if (options) - uart_parse_options(options, &baud, &parity, &bits, &flow); - else - uart00_console_get_options(port, &baud, &parity, &bits); - - return uart_set_options(port, co, baud, parity, bits, flow); -} - -extern struct uart_driver uart00_reg; -static struct console uart00_console = { - .name = SERIAL_UART00_NAME, - .write = uart00_console_write, - .device = uart_console_device, - .setup = uart00_console_setup, - .flags = CON_PRINTBUFFER, - .index = 0, - .data = &uart00_reg, -}; - -static int __init uart00_console_init(void) -{ - register_console(&uart00_console); - return 0; -} -console_initcall(uart00_console_init); - -#define UART00_CONSOLE &uart00_console -#else -#define UART00_CONSOLE NULL -#endif - -static struct uart_driver uart00_reg = { - .owner = NULL, - .driver_name = SERIAL_UART00_NAME, - .dev_name = SERIAL_UART00_NAME, - .major = SERIAL_UART00_MAJOR, - .minor = SERIAL_UART00_MINOR, - .nr = UART_NR, - .cons = UART00_CONSOLE, -}; - -struct dev_port_entry{ - unsigned int base_addr; - struct uart_port *port; -}; - -#ifdef CONFIG_PLD_HOTSWAP - -static struct dev_port_entry dev_port_map[UART_NR]; - -/* - * Keep a mapping of dev_info addresses -> port lines to use when - * removing ports dev==NULL indicates unused entry - */ - -struct uart00_ps_data{ - unsigned int clk; - unsigned int fifosize; -}; - -int uart00_add_device(struct pldhs_dev_info* dev_info, void* dev_ps_data) -{ - struct uart00_ps_data* dev_ps=dev_ps_data; - struct uart_port * port; - int i,result; - - i=0; - while(dev_port_map[i].port) - i++; - - if(i==UART_NR){ - printk(KERN_WARNING "uart00: Maximum number of ports reached\n"); - return 0; - } - - port=kmalloc(sizeof(struct uart_port),GFP_KERNEL); - if(!port) - return -ENOMEM; - - printk("clk=%d fifo=%d\n",dev_ps->clk,dev_ps->fifosize); - port->membase=0; - port->mapbase=dev_info->base_addr; - port->iotype=SERIAL_IO_MEM; - port->irq=dev_info->irq; - port->uartclk=dev_ps->clk; - port->fifosize=dev_ps->fifosize; - port->ops=&uart00_pops; - port->line=i; - port->flags=ASYNC_BOOT_AUTOCONF; - - result=uart_add_one_port(&uart00_reg, port); - if(result){ - printk("uart_add_one_port returned %d\n",result); - return result; - } - dev_port_map[i].base_addr=dev_info->base_addr; - dev_port_map[i].port=port; - printk("uart00: added device at %x as ttyUA%d\n",dev_port_map[i].base_addr,i); - return 0; - -} - -int uart00_remove_devices(void) -{ - int i,result; - - - result=0; - for(i=1;i<UART_NR;i++){ - if(dev_port_map[i].base_addr){ - result=uart_remove_one_port(&uart00_reg, dev_port_map[i].port); - if(result) - return result; - - /* port removed sucessfully, so now tidy up */ - kfree(dev_port_map[i].port); - dev_port_map[i].base_addr=0; - dev_port_map[i].port=NULL; - } - } - return 0; - -} - -struct pld_hotswap_ops uart00_pldhs_ops={ - .name = "uart00", - .add_device = uart00_add_device, - .remove_devices = uart00_remove_devices, -}; - -#endif - -static int __init uart00_init(void) -{ - int result; - - printk(KERN_INFO "Serial: UART00 driver $Revision: 1.35 $\n"); - - printk(KERN_WARNING "serial_uart00:Using temporary major/minor pairs" - " - these WILL change in the future\n"); - - result = uart_register_driver(&uart00_reg); - if (result) - return result; -#ifdef CONFIG_ARCH_CAMELOT - result = uart_add_one_port(&uart00_reg,&epxa10db_port); -#endif - if (result) - uart_unregister_driver(&uart00_reg); - -#ifdef CONFIG_PLD_HOTSWAP - pldhs_register_driver(&uart00_pldhs_ops); -#endif - return result; -} - -__initcall(uart00_init); |