diff options
Diffstat (limited to 'target/linux/amazon-2.6/files/drivers/serial/amazon_asc.c')
| -rw-r--r-- | target/linux/amazon-2.6/files/drivers/serial/amazon_asc.c | 685 |
1 files changed, 0 insertions, 685 deletions
diff --git a/target/linux/amazon-2.6/files/drivers/serial/amazon_asc.c b/target/linux/amazon-2.6/files/drivers/serial/amazon_asc.c deleted file mode 100644 index 7c17cb0f4..000000000 --- a/target/linux/amazon-2.6/files/drivers/serial/amazon_asc.c +++ /dev/null @@ -1,685 +0,0 @@ -/* - * Driver for AMAZONASC serial ports - * - * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. - * Based on drivers/serial/serial_s3c2400.c - * - * 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 - * - * Copyright (C) 2004 Infineon IFAP DC COM CPE - * Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org> - * Copyright (C) 2007 John Crispin <blogic@openwrt.org> - */ - -#include <linux/module.h> -#include <linux/errno.h> -#include <linux/signal.h> -#include <linux/sched.h> -#include <linux/interrupt.h> -#include <linux/tty.h> -#include <linux/tty_flip.h> -#include <linux/major.h> -#include <linux/string.h> -#include <linux/fcntl.h> -#include <linux/ptrace.h> -#include <linux/ioport.h> -#include <linux/mm.h> -#include <linux/slab.h> -#include <linux/init.h> -#include <linux/circ_buf.h> -#include <linux/serial.h> -#include <linux/serial_core.h> -#include <linux/console.h> -#include <linux/sysrq.h> -#include <linux/irq.h> - -#include <asm/system.h> -#include <asm/io.h> -#include <asm/uaccess.h> -#include <asm/bitops.h> -#include <asm/amazon/amazon.h> -#include <asm/amazon/irq.h> -#include <asm/amazon/serial.h> - -#define PORT_AMAZONASC 111 - -#include <linux/serial_core.h> - -#define UART_NR 1 - -#define UART_DUMMY_UER_RX 1 - -#define SERIAL_AMAZONASC_MAJOR TTY_MAJOR -#define CALLOUT_AMAZONASC_MAJOR TTYAUX_MAJOR -#define SERIAL_AMAZONASC_MINOR 64 -#define SERIAL_AMAZONASC_NR UART_NR - -static void amazonasc_tx_chars(struct uart_port *port); -extern void prom_printf(const char * fmt, ...); -static struct uart_port amazonasc_ports[UART_NR]; -static struct uart_driver amazonasc_reg; -static unsigned int uartclk = 0; -extern unsigned int amazon_get_fpi_hz(void); - -static void amazonasc_stop_tx(struct uart_port *port) -{ - /* fifo underrun shuts up after firing once */ - return; -} - -static void amazonasc_start_tx(struct uart_port *port) -{ - unsigned long flags; - - local_irq_save(flags); - amazonasc_tx_chars(port); - local_irq_restore(flags); - - return; -} - -static void amazonasc_stop_rx(struct uart_port *port) -{ - /* clear the RX enable bit */ - amazon_writel(ASCWHBCON_CLRREN, AMAZON_ASC_WHBCON); -} - -static void amazonasc_enable_ms(struct uart_port *port) -{ - /* no modem signals */ - return; -} - -static void -amazonasc_rx_chars(struct uart_port *port) -{ - struct tty_struct *tty = port->info->tty; - unsigned int ch = 0, rsr = 0, fifocnt; - - fifocnt = amazon_readl(AMAZON_ASC_FSTAT) & ASCFSTAT_RXFFLMASK; - while (fifocnt--) - { - u8 flag = TTY_NORMAL; - ch = amazon_readl(AMAZON_ASC_RBUF); - rsr = (amazon_readl(AMAZON_ASC_CON) & ASCCON_ANY) | UART_DUMMY_UER_RX; - tty_flip_buffer_push(tty); - port->icount.rx++; - - /* - * Note that the error handling code is - * out of the main execution path - */ - if (rsr & ASCCON_ANY) { - if (rsr & ASCCON_PE) { - port->icount.parity++; - amazon_writel_masked(AMAZON_ASC_WHBCON, ASCWHBCON_CLRPE, ASCWHBCON_CLRPE); - } else if (rsr & ASCCON_FE) { - port->icount.frame++; - amazon_writel_masked(AMAZON_ASC_WHBCON, ASCWHBCON_CLRFE, ASCWHBCON_CLRFE); - } - if (rsr & ASCCON_OE) { - port->icount.overrun++; - amazon_writel_masked(AMAZON_ASC_WHBCON, ASCWHBCON_CLROE, ASCWHBCON_CLROE); - } - - rsr &= port->read_status_mask; - - if (rsr & ASCCON_PE) - flag = TTY_PARITY; - else if (rsr & ASCCON_FE) - flag = TTY_FRAME; - } - - if ((rsr & port->ignore_status_mask) == 0) - tty_insert_flip_char(tty, ch, flag); - - if (rsr & ASCCON_OE) - /* - * Overrun is special, since it's reported - * immediately, and doesn't affect the current - * character - */ - tty_insert_flip_char(tty, 0, TTY_OVERRUN); - } - if (ch != 0) - tty_flip_buffer_push(tty); - - return; -} - - -static void amazonasc_tx_chars(struct uart_port *port) -{ - struct circ_buf *xmit = &port->info->xmit; - - if (uart_tx_stopped(port)) { - amazonasc_stop_tx(port); - return; - } - - while (((amazon_readl(AMAZON_ASC_FSTAT) & ASCFSTAT_TXFFLMASK) - >> ASCFSTAT_TXFFLOFF) != AMAZONASC_TXFIFO_FULL) - { - if (port->x_char) { - amazon_writel(port->x_char, AMAZON_ASC_TBUF); - port->icount.tx++; - port->x_char = 0; - continue; - } - - if (uart_circ_empty(xmit)) - break; - - amazon_writel(xmit->buf[xmit->tail], AMAZON_ASC_TBUF); - xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); - port->icount.tx++; - } - - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) - uart_write_wakeup(port); -} - -static irqreturn_t amazonasc_tx_int(int irq, void *port) -{ - amazon_writel(ASC_IRNCR_TIR, AMAZON_ASC_IRNCR1); - amazonasc_start_tx(port); - - /* clear any pending interrupts */ - amazon_writel_masked(AMAZON_ASC_WHBCON, - (ASCWHBCON_CLRPE | ASCWHBCON_CLRFE | ASCWHBCON_CLROE), - (ASCWHBCON_CLRPE | ASCWHBCON_CLRFE | ASCWHBCON_CLROE)); - - return IRQ_HANDLED; -} - -static irqreturn_t amazonasc_er_int(int irq, void *port) -{ - /* clear any pending interrupts */ - amazon_writel_masked(AMAZON_ASC_WHBCON, - (ASCWHBCON_CLRPE | ASCWHBCON_CLRFE | ASCWHBCON_CLROE), - (ASCWHBCON_CLRPE | ASCWHBCON_CLRFE | ASCWHBCON_CLROE)); - - return IRQ_HANDLED; -} - -static irqreturn_t amazonasc_rx_int(int irq, void *port) -{ - amazon_writel(ASC_IRNCR_RIR, AMAZON_ASC_IRNCR1); - amazonasc_rx_chars((struct uart_port *) port); - return IRQ_HANDLED; -} - -static u_int amazonasc_tx_empty(struct uart_port *port) -{ - int status; - - /* - * FSTAT tells exactly how many bytes are in the FIFO. - * The question is whether we really need to wait for all - * 16 bytes to be transmitted before reporting that the - * transmitter is empty. - */ - status = amazon_readl(AMAZON_ASC_FSTAT) & ASCFSTAT_TXFFLMASK; - return status ? 0 : TIOCSER_TEMT; -} - -static u_int amazonasc_get_mctrl(struct uart_port *port) -{ - /* no modem control signals - the readme says to pretend all are set */ - return TIOCM_CTS|TIOCM_CAR|TIOCM_DSR; -} - -static void amazonasc_set_mctrl(struct uart_port *port, u_int mctrl) -{ - /* no modem control - just return */ - return; -} - -static void amazonasc_break_ctl(struct uart_port *port, int break_state) -{ - /* no way to send a break */ - return; -} - -static int amazonasc_startup(struct uart_port *port) -{ - unsigned int con = 0; - unsigned long flags; - int retval; - - /* this assumes: CON.BRS = CON.FDE = 0 */ - if (uartclk == 0) - uartclk = amazon_get_fpi_hz(); - - amazonasc_ports[0].uartclk = uartclk; - - local_irq_save(flags); - - /* this setup was probably already done in u-boot */ - /* ASC and GPIO Port 1 bits 3 and 4 share the same pins - * P1.3 (RX) in, Alternate 10 - * P1.4 (TX) in, Alternate 10 - */ - amazon_writel_masked(AMAZON_GPIO_P1_DIR, 0x18, 0x10); //P1.4 output, P1.3 input - amazon_writel_masked(AMAZON_GPIO_P1_ALTSEL0, 0x18, 0x18); //ALTSETL0 11 - amazon_writel_masked(AMAZON_GPIO_P1_ALTSEL1, 0x18, 0); //ALTSETL1 00 - amazon_writel_masked(AMAZON_GPIO_P1_OD, 0x18, 0x10); - - /* set up the CLC */ - amazon_writel_masked(AMAZON_ASC_CLC, AMAZON_ASC_CLC_DISS, 0); - amazon_writel_masked(AMAZON_ASC_CLC, ASCCLC_RMCMASK, 1 << ASCCLC_RMCOFFSET); - - /* asynchronous mode */ - con = ASCCON_M_8ASYNC | ASCCON_FEN | ASCCON_OEN | ASCCON_PEN; - - /* choose the line - there's only one */ - amazon_writel(0, AMAZON_ASC_PISEL); - amazon_writel(((AMAZONASC_TXFIFO_FL << ASCTXFCON_TXFITLOFF) & ASCTXFCON_TXFITLMASK) | ASCTXFCON_TXFEN | ASCTXFCON_TXFFLU, - AMAZON_ASC_TXFCON); - amazon_writel(((AMAZONASC_RXFIFO_FL << ASCRXFCON_RXFITLOFF) & ASCRXFCON_RXFITLMASK) | ASCRXFCON_RXFEN | ASCRXFCON_RXFFLU, - AMAZON_ASC_RXFCON); - wmb(); - - amazon_writel_masked(AMAZON_ASC_CON, con, con); - - retval = request_irq(AMAZONASC_RIR, amazonasc_rx_int, 0, "asc_rx", port); - if (retval){ - printk("failed to request amazonasc_rx_int\n"); - return retval; - } - retval = request_irq(AMAZONASC_TIR, amazonasc_tx_int, 0, "asc_tx", port); - if (retval){ - printk("failed to request amazonasc_tx_int\n"); - goto err1; - } - - retval = request_irq(AMAZONASC_EIR, amazonasc_er_int, 0, "asc_er", port); - if (retval){ - printk("failed to request amazonasc_er_int\n"); - goto err2; - } - - local_irq_restore(flags); - return 0; - -err2: - free_irq(AMAZONASC_TIR, port); - -err1: - free_irq(AMAZONASC_RIR, port); - local_irq_restore(flags); - return retval; -} - -static void amazonasc_shutdown(struct uart_port *port) -{ - free_irq(AMAZONASC_RIR, port); - free_irq(AMAZONASC_TIR, port); - free_irq(AMAZONASC_EIR, port); - /* - * disable the baudrate generator to disable the ASC - */ - amazon_writel(0, AMAZON_ASC_CON); - - /* flush and then disable the fifos */ - amazon_writel_masked(AMAZON_ASC_RXFCON, ASCRXFCON_RXFFLU, ASCRXFCON_RXFFLU); - amazon_writel_masked(AMAZON_ASC_RXFCON, ASCRXFCON_RXFEN, 0); - amazon_writel_masked(AMAZON_ASC_TXFCON, ASCTXFCON_TXFFLU, ASCTXFCON_TXFFLU); - amazon_writel_masked(AMAZON_ASC_TXFCON, ASCTXFCON_TXFEN, 0); -} - -static void amazonasc_set_termios(struct uart_port *port, struct ktermios *new, struct ktermios *old) -{ - unsigned int cflag; - unsigned int iflag; - unsigned int baud, quot; - unsigned int con = 0; - unsigned long flags; - - cflag = new->c_cflag; - iflag = new->c_iflag; - - /* byte size and parity */ - switch (cflag & CSIZE) { - /* 7 bits are always with parity */ - case CS7: con = ASCCON_M_7ASYNCPAR; break; - /* the ASC only suports 7 and 8 bits */ - case CS5: - case CS6: - default: - if (cflag & PARENB) - con = ASCCON_M_8ASYNCPAR; - else - con = ASCCON_M_8ASYNC; - break; - } - if (cflag & CSTOPB) - con |= ASCCON_STP; - if (cflag & PARENB) { - if (!(cflag & PARODD)) - con &= ~ASCCON_ODD; - else - con |= ASCCON_ODD; - } - - port->read_status_mask = ASCCON_OE; - if (iflag & INPCK) - port->read_status_mask |= ASCCON_FE | ASCCON_PE; - - port->ignore_status_mask = 0; - if (iflag & IGNPAR) - port->ignore_status_mask |= ASCCON_FE | ASCCON_PE; - - if (iflag & IGNBRK) { - /* - * If we're ignoring parity and break indicators, - * ignore overruns too (for real raw support). - */ - if (iflag & IGNPAR) - port->ignore_status_mask |= ASCCON_OE; - } - - /* - * Ignore all characters if CREAD is not set. - */ - if ((cflag & CREAD) == 0) - port->ignore_status_mask |= UART_DUMMY_UER_RX; - - /* set error signals - framing, parity and overrun */ - con |= ASCCON_FEN; - con |= ASCCON_OEN; - con |= ASCCON_PEN; - /* enable the receiver */ - con |= ASCCON_REN; - - /* block the IRQs */ - local_irq_save(flags); - - /* set up CON */ - amazon_writel(con, AMAZON_ASC_CON); - - /* Set baud rate - take a divider of 2 into account */ - baud = uart_get_baud_rate(port, new, old, 0, port->uartclk/16); - quot = uart_get_divisor(port, baud); - quot = quot/2 - 1; - - /* the next 3 probably already happened when we set CON above */ - /* disable the baudrate generator */ - amazon_writel_masked(AMAZON_ASC_CON, ASCCON_R, 0); - /* make sure the fractional divider is off */ - amazon_writel_masked(AMAZON_ASC_CON, ASCCON_FDE, 0); - /* set up to use divisor of 2 */ - amazon_writel_masked(AMAZON_ASC_CON, ASCCON_BRS, 0); - /* now we can write the new baudrate into the register */ - amazon_writel(quot, AMAZON_ASC_BTR); - /* turn the baudrate generator back on */ - amazon_writel_masked(AMAZON_ASC_CON, ASCCON_R, ASCCON_R); - - local_irq_restore(flags); -} - -static const char *amazonasc_type(struct uart_port *port) -{ - return port->type == PORT_AMAZONASC ? "AMAZONASC" : NULL; -} - -/* - * Release the memory region(s) being used by 'port' - */ -static void amazonasc_release_port(struct uart_port *port) -{ - return; -} - -/* - * Request the memory region(s) being used by 'port' - */ -static int amazonasc_request_port(struct uart_port *port) -{ - return 0; -} - -/* - * Configure/autoconfigure the port. - */ -static void amazonasc_config_port(struct uart_port *port, int flags) -{ - if (flags & UART_CONFIG_TYPE) { - port->type = PORT_AMAZONASC; - amazonasc_request_port(port); - } -} - -/* - * verify the new serial_struct (for TIOCSSERIAL). - */ -static int amazonasc_verify_port(struct uart_port *port, struct serial_struct *ser) -{ - int ret = 0; - if (ser->type != PORT_UNKNOWN && ser->type != PORT_AMAZONASC) - 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 amazonasc_pops = { - .tx_empty = amazonasc_tx_empty, - .set_mctrl = amazonasc_set_mctrl, - .get_mctrl = amazonasc_get_mctrl, - .stop_tx = amazonasc_stop_tx, - .start_tx = amazonasc_start_tx, - .stop_rx = amazonasc_stop_rx, - .enable_ms = amazonasc_enable_ms, - .break_ctl = amazonasc_break_ctl, - .startup = amazonasc_startup, - .shutdown = amazonasc_shutdown, - .set_termios = amazonasc_set_termios, - .type = amazonasc_type, - .release_port = amazonasc_release_port, - .request_port = amazonasc_request_port, - .config_port = amazonasc_config_port, - .verify_port = amazonasc_verify_port, -}; - -static struct uart_port amazonasc_ports[UART_NR] = { - { - membase: (void *)AMAZON_ASC, - mapbase: AMAZON_ASC, - iotype: SERIAL_IO_MEM, - irq: AMAZONASC_RIR, /* RIR */ - uartclk: 0, /* filled in dynamically */ - fifosize: 16, - unused: { AMAZONASC_TIR, AMAZONASC_EIR}, /* xmit/error/xmit-buffer-empty IRQ */ - type: PORT_AMAZONASC, - ops: &amazonasc_pops, - flags: ASYNC_BOOT_AUTOCONF, - }, -}; - -static void amazonasc_console_write(struct console *co, const char *s, u_int count) -{ - int i, fifocnt; - unsigned long flags; - local_irq_save(flags); - for (i = 0; i < count;) - { - /* wait until the FIFO is not full */ - do - { - fifocnt = (amazon_readl(AMAZON_ASC_FSTAT) & ASCFSTAT_TXFFLMASK) - >> ASCFSTAT_TXFFLOFF; - } while (fifocnt == AMAZONASC_TXFIFO_FULL); - if (s[i] == '\0') - { - break; - } - if (s[i] == '\n') - { - amazon_writel('\r', AMAZON_ASC_TBUF); - do - { - fifocnt = (amazon_readl(AMAZON_ASC_FSTAT) & - ASCFSTAT_TXFFLMASK) >> ASCFSTAT_TXFFLOFF; - } while (fifocnt == AMAZONASC_TXFIFO_FULL); - } - amazon_writel(s[i], AMAZON_ASC_TBUF); - i++; - } - - local_irq_restore(flags); -} - -static void __init -amazonasc_console_get_options(struct uart_port *port, int *baud, int *parity, int *bits) -{ - u_int lcr_h; - - lcr_h = amazon_readl(AMAZON_ASC_CON); - /* do this only if the ASC is turned on */ - if (lcr_h & ASCCON_R) { - u_int quot, div, fdiv, frac; - - *parity = 'n'; - if ((lcr_h & ASCCON_MODEMASK) == ASCCON_M_7ASYNCPAR || - (lcr_h & ASCCON_MODEMASK) == ASCCON_M_8ASYNCPAR) { - if (lcr_h & ASCCON_ODD) - *parity = 'o'; - else - *parity = 'e'; - } - - if ((lcr_h & ASCCON_MODEMASK) == ASCCON_M_7ASYNCPAR) - *bits = 7; - else - *bits = 8; - - quot = amazon_readl(AMAZON_ASC_BTR) + 1; - - /* this gets hairy if the fractional divider is used */ - if (lcr_h & ASCCON_FDE) - { - div = 1; - fdiv = amazon_readl(AMAZON_ASC_FDV); - if (fdiv == 0) - fdiv = 512; - frac = 512; - } - else - { - div = lcr_h & ASCCON_BRS ? 3 : 2; - fdiv = frac = 1; - } - /* - * This doesn't work exactly because we use integer - * math to calculate baud which results in rounding - * errors when we try to go from quot -> baud !! - * Try to make this work for both the fractional divider - * and the simple divider. Also try to avoid rounding - * errors using integer math. - */ - - *baud = frac * (port->uartclk / (div * 512 * 16 * quot)); - if (*baud > 1100 && *baud < 2400) - *baud = 1200; - if (*baud > 2300 && *baud < 4800) - *baud = 2400; - if (*baud > 4700 && *baud < 9600) - *baud = 4800; - if (*baud > 9500 && *baud < 19200) - *baud = 9600; - if (*baud > 19000 && *baud < 38400) - *baud = 19200; - if (*baud > 38400 && *baud < 57600) - *baud = 38400; - if (*baud > 57600 && *baud < 115200) - *baud = 57600; - if (*baud > 115200 && *baud < 230400) - *baud = 115200; - } -} - -static int __init amazonasc_console_setup(struct console *co, char *options) -{ - struct uart_port *port; - int baud = 115200; - int bits = 8; - int parity = 'n'; - int flow = 'n'; - - /* this assumes: CON.BRS = CON.FDE = 0 */ - if (uartclk == 0) - uartclk = amazon_get_fpi_hz(); - co->index = 0; - port = &amazonasc_ports[0]; - amazonasc_ports[0].uartclk = uartclk; - amazonasc_ports[0].type = PORT_AMAZONASC; - - if (options){ - uart_parse_options(options, &baud, &parity, &bits, &flow); - } - - return uart_set_options(port, co, baud, parity, bits, flow); -} - -static struct uart_driver amazonasc_reg; -static struct console amazonasc_console = { - name: "ttyS", - write: amazonasc_console_write, - device: uart_console_device, - setup: amazonasc_console_setup, - flags: CON_PRINTBUFFER, - index: -1, - data: &amazonasc_reg, -}; - -static int __init amazonasc_console_init(void) -{ - register_console(&amazonasc_console); - return 0; -} -console_initcall(amazonasc_console_init); - -static struct uart_driver amazonasc_reg = { - .owner = THIS_MODULE, - .driver_name = "serial", - .dev_name = "ttyS", - .major = TTY_MAJOR, - .minor = 64, - .nr = UART_NR, - .cons = &amazonasc_console, -}; - -static int __init amazonasc_init(void) -{ - unsigned char res; - uart_register_driver(&amazonasc_reg); - res = uart_add_one_port(&amazonasc_reg, &amazonasc_ports[0]); - return res; -} - -static void __exit amazonasc_exit(void) -{ - uart_unregister_driver(&amazonasc_reg); -} - -module_init(amazonasc_init); -module_exit(amazonasc_exit); - -MODULE_AUTHOR("Gary Jennejohn, Felix Fietkau, John Crispin"); -MODULE_DESCRIPTION("MIPS AMAZONASC serial port driver"); -MODULE_LICENSE("GPL"); |