diff options
Diffstat (limited to 'drivers/serial/bfin_5xx.c')
| -rw-r--r-- | drivers/serial/bfin_5xx.c | 1012 |
1 files changed, 0 insertions, 1012 deletions
diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c deleted file mode 100644 index 408390f93db..00000000000 --- a/drivers/serial/bfin_5xx.c +++ /dev/null @@ -1,1012 +0,0 @@ -/* - * File: drivers/serial/bfin_5xx.c - * Based on: Based on drivers/serial/sa1100.c - * Author: Aubrey Li <aubrey.li@analog.com> - * - * Created: - * Description: Driver for blackfin 5xx serial ports - * - * Rev: $Id: bfin_5xx.c,v 1.19 2006/09/24 02:33:53 aubrey Exp $ - * - * Modified: - * Copyright 2006 Analog Devices Inc. - * - * Bugs: Enter bugs at http://blackfin.uclinux.org/ - * - * 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, see the file COPYING, or write - * to the Free Software Foundation, Inc., - * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA - */ - -#if defined(CONFIG_SERIAL_BFIN_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/platform_device.h> -#include <linux/tty.h> -#include <linux/tty_flip.h> -#include <linux/serial_core.h> - -#include <asm/gpio.h> -#include <asm/mach/bfin_serial_5xx.h> - -#ifdef CONFIG_SERIAL_BFIN_DMA -#include <linux/dma-mapping.h> -#include <asm/io.h> -#include <asm/irq.h> -#include <asm/cacheflush.h> -#endif - -/* UART name and device definitions */ -#define BFIN_SERIAL_NAME "ttyBF" -#define BFIN_SERIAL_MAJOR 204 -#define BFIN_SERIAL_MINOR 64 - -/* - * Setup for console. Argument comes from the menuconfig - */ -#define DMA_RX_XCOUNT 512 -#define DMA_RX_YCOUNT (PAGE_SIZE / DMA_RX_XCOUNT) - -#define DMA_RX_FLUSH_JIFFIES 5 - -#ifdef CONFIG_SERIAL_BFIN_DMA -static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart); -#else -static void bfin_serial_do_work(struct work_struct *work); -static void bfin_serial_tx_chars(struct bfin_serial_port *uart); -static void local_put_char(struct bfin_serial_port *uart, char ch); -#endif - -static void bfin_serial_mctrl_check(struct bfin_serial_port *uart); - -/* - * interrupts are disabled on entry - */ -static void bfin_serial_stop_tx(struct uart_port *port) -{ - struct bfin_serial_port *uart = (struct bfin_serial_port *)port; - -#ifdef CONFIG_SERIAL_BFIN_DMA - disable_dma(uart->tx_dma_channel); -#else - unsigned short ier; - - ier = UART_GET_IER(uart); - ier &= ~ETBEI; - UART_PUT_IER(uart, ier); -#endif -} - -/* - * port is locked and interrupts are disabled - */ -static void bfin_serial_start_tx(struct uart_port *port) -{ - struct bfin_serial_port *uart = (struct bfin_serial_port *)port; - -#ifdef CONFIG_SERIAL_BFIN_DMA - bfin_serial_dma_tx_chars(uart); -#else - unsigned short ier; - ier = UART_GET_IER(uart); - ier |= ETBEI; - UART_PUT_IER(uart, ier); - bfin_serial_tx_chars(uart); -#endif -} - -/* - * Interrupts are enabled - */ -static void bfin_serial_stop_rx(struct uart_port *port) -{ - struct bfin_serial_port *uart = (struct bfin_serial_port *)port; - unsigned short ier; - - ier = UART_GET_IER(uart); - ier &= ~ERBFI; - UART_PUT_IER(uart, ier); -} - -/* - * Set the modem control timer to fire immediately. - */ -static void bfin_serial_enable_ms(struct uart_port *port) -{ -} - -#ifdef CONFIG_SERIAL_BFIN_PIO -static void local_put_char(struct bfin_serial_port *uart, char ch) -{ - unsigned short status; - int flags = 0; - - spin_lock_irqsave(&uart->port.lock, flags); - - do { - status = UART_GET_LSR(uart); - } while (!(status & THRE)); - - UART_PUT_CHAR(uart, ch); - SSYNC(); - - spin_unlock_irqrestore(&uart->port.lock, flags); -} - -static void bfin_serial_rx_chars(struct bfin_serial_port *uart) -{ - struct tty_struct *tty = uart->port.info?uart->port.info->tty:0; - unsigned int status, ch, flg; -#ifdef BF533_FAMILY - static int in_break = 0; -#endif - - status = UART_GET_LSR(uart); - ch = UART_GET_CHAR(uart); - uart->port.icount.rx++; - -#ifdef BF533_FAMILY - /* The BF533 family of processors have a nice misbehavior where - * they continuously generate characters for a "single" break. - * We have to basically ignore this flood until the "next" valid - * character comes across. All other Blackfin families operate - * properly though. - */ - if (in_break) { - if (ch != 0) { - in_break = 0; - ch = UART_GET_CHAR(uart); - } - return; - } -#endif - - if (status & BI) { -#ifdef BF533_FAMILY - in_break = 1; -#endif - uart->port.icount.brk++; - if (uart_handle_break(&uart->port)) - goto ignore_char; - flg = TTY_BREAK; - } else if (status & PE) { - flg = TTY_PARITY; - uart->port.icount.parity++; - } else if (status & OE) { - flg = TTY_OVERRUN; - uart->port.icount.overrun++; - } else if (status & FE) { - flg = TTY_FRAME; - uart->port.icount.frame++; - } else - flg = TTY_NORMAL; - - if (uart_handle_sysrq_char(&uart->port, ch)) - goto ignore_char; - if (tty) - uart_insert_char(&uart->port, status, 2, ch, flg); - -ignore_char: - if (tty) - tty_flip_buffer_push(tty); -} - -static void bfin_serial_tx_chars(struct bfin_serial_port *uart) -{ - struct circ_buf *xmit = &uart->port.info->xmit; - - if (uart->port.x_char) { - UART_PUT_CHAR(uart, uart->port.x_char); - uart->port.icount.tx++; - uart->port.x_char = 0; - return; - } - /* - * Check the modem control lines before - * transmitting anything. - */ - bfin_serial_mctrl_check(uart); - - if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) { - bfin_serial_stop_tx(&uart->port); - return; - } - - local_put_char(uart, xmit->buf[xmit->tail]); - xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); - uart->port.icount.tx++; - - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) - uart_write_wakeup(&uart->port); - - if (uart_circ_empty(xmit)) - bfin_serial_stop_tx(&uart->port); -} - -static irqreturn_t bfin_serial_int(int irq, void *dev_id) -{ - struct bfin_serial_port *uart = dev_id; - unsigned short status; - - spin_lock(&uart->port.lock); - status = UART_GET_IIR(uart); - do { - if ((status & IIR_STATUS) == IIR_TX_READY) - bfin_serial_tx_chars(uart); - if ((status & IIR_STATUS) == IIR_RX_READY) - bfin_serial_rx_chars(uart); - status = UART_GET_IIR(uart); - } while (status & (IIR_TX_READY | IIR_RX_READY)); - spin_unlock(&uart->port.lock); - return IRQ_HANDLED; -} - -static void bfin_serial_do_work(struct work_struct *work) -{ - struct bfin_serial_port *uart = container_of(work, struct bfin_serial_port, cts_workqueue); - - bfin_serial_mctrl_check(uart); -} - -#endif - -#ifdef CONFIG_SERIAL_BFIN_DMA -static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart) -{ - struct circ_buf *xmit = &uart->port.info->xmit; - unsigned short ier; - int flags = 0; - - if (!uart->tx_done) - return; - - uart->tx_done = 0; - - if (uart->port.x_char) { - UART_PUT_CHAR(uart, uart->port.x_char); - uart->port.icount.tx++; - uart->port.x_char = 0; - uart->tx_done = 1; - return; - } - /* - * Check the modem control lines before - * transmitting anything. - */ - bfin_serial_mctrl_check(uart); - - if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) { - bfin_serial_stop_tx(&uart->port); - uart->tx_done = 1; - return; - } - - spin_lock_irqsave(&uart->port.lock, flags); - uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE); - if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail)) - uart->tx_count = UART_XMIT_SIZE - xmit->tail; - blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail), - (unsigned long)(xmit->buf+xmit->tail+uart->tx_count)); - set_dma_config(uart->tx_dma_channel, - set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP, - INTR_ON_BUF, - DIMENSION_LINEAR, - DATA_SIZE_8)); - set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail)); - set_dma_x_count(uart->tx_dma_channel, uart->tx_count); - set_dma_x_modify(uart->tx_dma_channel, 1); - enable_dma(uart->tx_dma_channel); - ier = UART_GET_IER(uart); - ier |= ETBEI; - UART_PUT_IER(uart, ier); - spin_unlock_irqrestore(&uart->port.lock, flags); -} - -static void bfin_serial_dma_rx_chars(struct bfin_serial_port * uart) -{ - struct tty_struct *tty = uart->port.info->tty; - int i, flg, status; - - status = UART_GET_LSR(uart); - uart->port.icount.rx += CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail, UART_XMIT_SIZE);; - - if (status & BI) { - uart->port.icount.brk++; - if (uart_handle_break(&uart->port)) - goto dma_ignore_char; - flg = TTY_BREAK; - } else if (status & PE) { - flg = TTY_PARITY; - uart->port.icount.parity++; - } else if (status & OE) { - flg = TTY_OVERRUN; - uart->port.icount.overrun++; - } else if (status & FE) { - flg = TTY_FRAME; - uart->port.icount.frame++; - } else - flg = TTY_NORMAL; - - for (i = uart->rx_dma_buf.head; i < uart->rx_dma_buf.tail; i++) { - if (uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i])) - goto dma_ignore_char; - uart_insert_char(&uart->port, status, 2, uart->rx_dma_buf.buf[i], flg); - } -dma_ignore_char: - tty_flip_buffer_push(tty); -} - -void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart) -{ - int x_pos, pos; - int flags = 0; - - bfin_serial_dma_tx_chars(uart); - - spin_lock_irqsave(&uart->port.lock, flags); - x_pos = DMA_RX_XCOUNT - get_dma_curr_xcount(uart->rx_dma_channel); - if (x_pos == DMA_RX_XCOUNT) - x_pos = 0; - - pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos; - - if (pos>uart->rx_dma_buf.tail) { - uart->rx_dma_buf.tail = pos; - bfin_serial_dma_rx_chars(uart); - uart->rx_dma_buf.head = uart->rx_dma_buf.tail; - } - spin_unlock_irqrestore(&uart->port.lock, flags); - uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES; - add_timer(&(uart->rx_dma_timer)); -} - -static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id) -{ - struct bfin_serial_port *uart = dev_id; - struct circ_buf *xmit = &uart->port.info->xmit; - unsigned short ier; - - spin_lock(&uart->port.lock); - if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) { - clear_dma_irqstat(uart->tx_dma_channel); - disable_dma(uart->tx_dma_channel); - ier = UART_GET_IER(uart); - ier &= ~ETBEI; - UART_PUT_IER(uart, ier); - xmit->tail = (xmit->tail+uart->tx_count) &(UART_XMIT_SIZE -1); - uart->port.icount.tx+=uart->tx_count; - - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) - uart_write_wakeup(&uart->port); - - if (uart_circ_empty(xmit)) - bfin_serial_stop_tx(&uart->port); - uart->tx_done = 1; - } - - spin_unlock(&uart->port.lock); - return IRQ_HANDLED; -} - -static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id) -{ - struct bfin_serial_port *uart = dev_id; - unsigned short irqstat; - - uart->rx_dma_nrows++; - if (uart->rx_dma_nrows == DMA_RX_YCOUNT) { - uart->rx_dma_nrows = 0; - uart->rx_dma_buf.tail = DMA_RX_XCOUNT*DMA_RX_YCOUNT; - bfin_serial_dma_rx_chars(uart); - uart->rx_dma_buf.head = uart->rx_dma_buf.tail = 0; - } - spin_lock(&uart->port.lock); - irqstat = get_dma_curr_irqstat(uart->rx_dma_channel); - clear_dma_irqstat(uart->rx_dma_channel); - - spin_unlock(&uart->port.lock); - return IRQ_HANDLED; -} -#endif - -/* - * Return TIOCSER_TEMT when transmitter is not busy. - */ -static unsigned int bfin_serial_tx_empty(struct uart_port *port) -{ - struct bfin_serial_port *uart = (struct bfin_serial_port *)port; - unsigned short lsr; - - lsr = UART_GET_LSR(uart); - if (lsr & TEMT) - return TIOCSER_TEMT; - else - return 0; -} - -static unsigned int bfin_serial_get_mctrl(struct uart_port *port) -{ -#ifdef CONFIG_SERIAL_BFIN_CTSRTS - struct bfin_serial_port *uart = (struct bfin_serial_port *)port; - if (uart->cts_pin < 0) - return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; - - if (gpio_get_value(uart->cts_pin)) - return TIOCM_DSR | TIOCM_CAR; - else -#endif - return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; -} - -static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl) -{ -#ifdef CONFIG_SERIAL_BFIN_CTSRTS - struct bfin_serial_port *uart = (struct bfin_serial_port *)port; - if (uart->rts_pin < 0) - return; - - if (mctrl & TIOCM_RTS) - gpio_set_value(uart->rts_pin, 0); - else - gpio_set_value(uart->rts_pin, 1); -#endif -} - -/* - * Handle any change of modem status signal since we were last called. - */ -static void bfin_serial_mctrl_check(struct bfin_serial_port *uart) -{ -#ifdef CONFIG_SERIAL_BFIN_CTSRTS - unsigned int status; -# ifdef CONFIG_SERIAL_BFIN_DMA - struct uart_info *info = uart->port.info; - struct tty_struct *tty = info->tty; - - status = bfin_serial_get_mctrl(&uart->port); - if (!(status & TIOCM_CTS)) { - tty->hw_stopped = 1; - } else { - tty->hw_stopped = 0; - } -# else - status = bfin_serial_get_mctrl(&uart->port); - uart_handle_cts_change(&uart->port, status & TIOCM_CTS); - if (!(status & TIOCM_CTS)) - schedule_work(&uart->cts_workqueue); -# endif -#endif -} - -/* - * Interrupts are always disabled. - */ -static void bfin_serial_break_ctl(struct uart_port *port, int break_state) -{ -} - -static int bfin_serial_startup(struct uart_port *port) -{ - struct bfin_serial_port *uart = (struct bfin_serial_port *)port; - -#ifdef CONFIG_SERIAL_BFIN_DMA - dma_addr_t dma_handle; - - if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) { - printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n"); - return -EBUSY; - } - - if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) { - printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n"); - free_dma(uart->rx_dma_channel); - return -EBUSY; - } - - set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart); - set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart); - - uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA); - uart->rx_dma_buf.head = 0; - uart->rx_dma_buf.tail = 0; - uart->rx_dma_nrows = 0; - - set_dma_config(uart->rx_dma_channel, - set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO, - INTR_ON_ROW, DIMENSION_2D, - DATA_SIZE_8)); - set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT); - set_dma_x_modify(uart->rx_dma_channel, 1); - set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT); - set_dma_y_modify(uart->rx_dma_channel, 1); - set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf); - enable_dma(uart->rx_dma_channel); - - uart->rx_dma_timer.data = (unsigned long)(uart); - uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout; - uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES; - add_timer(&(uart->rx_dma_timer)); -#else - if (request_irq - (uart->port.irq, bfin_serial_int, IRQF_DISABLED, - "BFIN_UART_RX", uart)) { - printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n"); - return -EBUSY; - } - - if (request_irq - (uart->port.irq+1, bfin_serial_int, IRQF_DISABLED, - "BFIN_UART_TX", uart)) { - printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n"); - free_irq(uart->port.irq, uart); - return -EBUSY; - } -#endif - UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI); - return 0; -} - -static void bfin_serial_shutdown(struct uart_port *port) -{ - struct bfin_serial_port *uart = (struct bfin_serial_port *)port; - -#ifdef CONFIG_SERIAL_BFIN_DMA - disable_dma(uart->tx_dma_channel); - free_dma(uart->tx_dma_channel); - disable_dma(uart->rx_dma_channel); - free_dma(uart->rx_dma_channel); - del_timer(&(uart->rx_dma_timer)); -#else - free_irq(uart->port.irq, uart); - free_irq(uart->port.irq+1, uart); -#endif -} - -static void -bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios, - struct ktermios *old) -{ - struct bfin_serial_port *uart = (struct bfin_serial_port *)port; - unsigned long flags; - unsigned int baud, quot; - unsigned short val, ier, lsr, lcr = 0; - - switch (termios->c_cflag & CSIZE) { - case CS8: - lcr = WLS(8); - break; - case CS7: - lcr = WLS(7); - break; - case CS6: - lcr = WLS(6); - break; - case CS5: - lcr = WLS(5); - break; - default: - printk(KERN_ERR "%s: word lengh not supported\n", - __FUNCTION__); - } - - if (termios->c_cflag & CSTOPB) - lcr |= STB; - if (termios->c_cflag & PARENB) { - lcr |= PEN; - if (!(termios->c_cflag & PARODD)) - lcr |= EPS; - } - - /* These controls are not implemented for this port */ - termios->c_iflag |= INPCK | BRKINT | PARMRK; - termios->c_iflag &= ~(IGNPAR | IGNBRK); - - /* These controls are not implemented for this port */ - termios->c_iflag |= INPCK | BRKINT | PARMRK; - termios->c_iflag &= ~(IGNPAR | IGNBRK); - - baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); - quot = uart_get_divisor(port, baud); - spin_lock_irqsave(&uart->port.lock, flags); - - do { - lsr = UART_GET_LSR(uart); - } while (!(lsr & TEMT)); - - /* Disable UART */ - ier = UART_GET_IER(uart); - UART_PUT_IER(uart, 0); - - /* Set DLAB in LCR to Access DLL and DLH */ - val = UART_GET_LCR(uart); - val |= DLAB; - UART_PUT_LCR(uart, val); - SSYNC(); - - UART_PUT_DLL(uart, quot & 0xFF); - SSYNC(); - UART_PUT_DLH(uart, (quot >> 8) & 0xFF); - SSYNC(); - - /* Clear DLAB in LCR to Access THR RBR IER */ - val = UART_GET_LCR(uart); - val &= ~DLAB; - UART_PUT_LCR(uart, val); - SSYNC(); - - UART_PUT_LCR(uart, lcr); - - /* Enable UART */ - UART_PUT_IER(uart, ier); - - val = UART_GET_GCTL(uart); - val |= UCEN; - UART_PUT_GCTL(uart, val); - - spin_unlock_irqrestore(&uart->port.lock, flags); -} - -static const char *bfin_serial_type(struct uart_port *port) -{ - struct bfin_serial_port *uart = (struct bfin_serial_port *)port; - - return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL; -} - -/* - * Release the memory region(s) being used by 'port'. - */ -static void bfin_serial_release_port(struct uart_port *port) -{ -} - -/* - * Request the memory region(s) being used by 'port'. - */ -static int bfin_serial_request_port(struct uart_port *port) -{ - return 0; -} - -/* - * Configure/autoconfigure the port. - */ -static void bfin_serial_config_port(struct uart_port *port, int flags) -{ - struct bfin_serial_port *uart = (struct bfin_serial_port *)port; - - if (flags & UART_CONFIG_TYPE && - bfin_serial_request_port(&uart->port) == 0) - uart->port.type = PORT_BFIN; -} - -/* - * Verify the new serial_struct (for TIOCSSERIAL). - * The only change we allow are to the flags and type, and - * even then only between PORT_BFIN and PORT_UNKNOWN - */ -static int -bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser) -{ - return 0; -} - -static struct uart_ops bfin_serial_pops = { - .tx_empty = bfin_serial_tx_empty, - .set_mctrl = bfin_serial_set_mctrl, - .get_mctrl = bfin_serial_get_mctrl, - .stop_tx = bfin_serial_stop_tx, - .start_tx = bfin_serial_start_tx, - .stop_rx = bfin_serial_stop_rx, - .enable_ms = bfin_serial_enable_ms, - .break_ctl = bfin_serial_break_ctl, - .startup = bfin_serial_startup, - .shutdown = bfin_serial_shutdown, - .set_termios = bfin_serial_set_termios, - .type = bfin_serial_type, - .release_port = bfin_serial_release_port, - .request_port = bfin_serial_request_port, - .config_port = bfin_serial_config_port, - .verify_port = bfin_serial_verify_port, -}; - -static void __init bfin_serial_init_ports(void) -{ - static int first = 1; - int i; - - if (!first) - return; - first = 0; - - for (i = 0; i < nr_ports; i++) { - bfin_serial_ports[i].port.uartclk = get_sclk(); - bfin_serial_ports[i].port.ops = &bfin_serial_pops; - bfin_serial_ports[i].port.line = i; - bfin_serial_ports[i].port.iotype = UPIO_MEM; - bfin_serial_ports[i].port.membase = - (void __iomem *)bfin_serial_resource[i].uart_base_addr; - bfin_serial_ports[i].port.mapbase = - bfin_serial_resource[i].uart_base_addr; - bfin_serial_ports[i].port.irq = - bfin_serial_resource[i].uart_irq; - bfin_serial_ports[i].port.flags = UPF_BOOT_AUTOCONF; -#ifdef CONFIG_SERIAL_BFIN_DMA - bfin_serial_ports[i].tx_done = 1; - bfin_serial_ports[i].tx_count = 0; - bfin_serial_ports[i].tx_dma_channel = - bfin_serial_resource[i].uart_tx_dma_channel; - bfin_serial_ports[i].rx_dma_channel = - bfin_serial_resource[i].uart_rx_dma_channel; - init_timer(&(bfin_serial_ports[i].rx_dma_timer)); -#else - INIT_WORK(&bfin_serial_ports[i].cts_workqueue, bfin_serial_do_work); -#endif -#ifdef CONFIG_SERIAL_BFIN_CTSRTS - bfin_serial_ports[i].cts_pin = - bfin_serial_resource[i].uart_cts_pin; - bfin_serial_ports[i].rts_pin = - bfin_serial_resource[i].uart_rts_pin; -#endif - bfin_serial_hw_init(&bfin_serial_ports[i]); - - } -} - -#ifdef CONFIG_SERIAL_BFIN_CONSOLE -static void bfin_serial_console_putchar(struct uart_port *port, int ch) -{ - struct bfin_serial_port *uart = (struct bfin_serial_port *)port; - while (!(UART_GET_LSR(uart))) - barrier(); - UART_PUT_CHAR(uart, ch); - SSYNC(); -} - -/* - * Interrupts are disabled on entering - */ -static void -bfin_serial_console_write(struct console *co, const char *s, unsigned int count) -{ - struct bfin_serial_port *uart = &bfin_serial_ports[co->index]; - int flags = 0; - - spin_lock_irqsave(&uart->port.lock, flags); - uart_console_write(&uart->port, s, count, bfin_serial_console_putchar); - spin_unlock_irqrestore(&uart->port.lock, flags); - -} - -/* - * If the port was already initialised (eg, by a boot loader), - * try to determine the current setup. - */ -static void __init -bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud, - int *parity, int *bits) -{ - unsigned short status; - - status = UART_GET_IER(uart) & (ERBFI | ETBEI); - if (status == (ERBFI | ETBEI)) { - /* ok, the port was enabled */ - unsigned short lcr, val; - unsigned short dlh, dll; - - lcr = UART_GET_LCR(uart); - - *parity = 'n'; - if (lcr & PEN) { - if (lcr & EPS) - *parity = 'e'; - else - *parity = 'o'; - } - switch (lcr & 0x03) { - case 0: *bits = 5; break; - case 1: *bits = 6; break; - case 2: *bits = 7; break; - case 3: *bits = 8; break; - } - /* Set DLAB in LCR to Access DLL and DLH */ - val = UART_GET_LCR(uart); - val |= DLAB; - UART_PUT_LCR(uart, val); - - dll = UART_GET_DLL(uart); - dlh = UART_GET_DLH(uart); - - /* Clear DLAB in LCR to Access THR RBR IER */ - val = UART_GET_LCR(uart); - val &= ~DLAB; - UART_PUT_LCR(uart, val); - - *baud = get_sclk() / (16*(dll | dlh << 8)); - } - pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __FUNCTION__, *baud, *parity, *bits); -} - -static int __init -bfin_serial_console_setup(struct console *co, char *options) -{ - struct bfin_serial_port *uart; - int baud = 57600; - int bits = 8; - int parity = 'n'; -#ifdef CONFIG_SERIAL_BFIN_CTSRTS - int flow = 'r'; -#else - int flow = 'n'; -#endif - - /* - * 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 == -1 || co->index >= nr_ports) - co->index = 0; - uart = &bfin_serial_ports[co->index]; - - if (options) - uart_parse_options(options, &baud, &parity, &bits, &flow); - else - bfin_serial_console_get_options(uart, &baud, &parity, &bits); - - return uart_set_options(&uart->port, co, baud, parity, bits, flow); -} - -static struct uart_driver bfin_serial_reg; -static struct console bfin_serial_console = { - .name = BFIN_SERIAL_NAME, - .write = bfin_serial_console_write, - .device = uart_console_device, - .setup = bfin_serial_console_setup, - .flags = CON_PRINTBUFFER, - .index = -1, - .data = &bfin_serial_reg, -}; - -static int __init bfin_serial_rs_console_init(void) -{ - bfin_serial_init_ports(); - register_console(&bfin_serial_console); - return 0; -} -console_initcall(bfin_serial_rs_console_init); - -#define BFIN_SERIAL_CONSOLE &bfin_serial_console -#else -#define BFIN_SERIAL_CONSOLE NULL -#endif - -static struct uart_driver bfin_serial_reg = { - .owner = THIS_MODULE, - .driver_name = "bfin-uart", - .dev_name = BFIN_SERIAL_NAME, - .major = BFIN_SERIAL_MAJOR, - .minor = BFIN_SERIAL_MINOR, - .nr = NR_PORTS, - .cons = BFIN_SERIAL_CONSOLE, -}; - -static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state) -{ - struct bfin_serial_port *uart = platform_get_drvdata(dev); - - if (uart) - uart_suspend_port(&bfin_serial_reg, &uart->port); - - return 0; -} - -static int bfin_serial_resume(struct platform_device *dev) -{ - struct bfin_serial_port *uart = platform_get_drvdata(dev); - - if (uart) - uart_resume_port(&bfin_serial_reg, &uart->port); - - return 0; -} - -static int bfin_serial_probe(struct platform_device *dev) -{ - struct resource *res = dev->resource; - int i; - - for (i = 0; i < dev->num_resources; i++, res++) - if (res->flags & IORESOURCE_MEM) - break; - - if (i < dev->num_resources) { - for (i = 0; i < nr_ports; i++, res++) { - if (bfin_serial_ports[i].port.mapbase != res->start) - continue; - bfin_serial_ports[i].port.dev = &dev->dev; - uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port); - platform_set_drvdata(dev, &bfin_serial_ports[i]); - } - } - - return 0; -} - -static int bfin_serial_remove(struct platform_device *pdev) -{ - struct bfin_serial_port *uart = platform_get_drvdata(pdev); - - -#ifdef CONFIG_SERIAL_BFIN_CTSRTS - gpio_free(uart->cts_pin); - gpio_free(uart->rts_pin); -#endif - - platform_set_drvdata(pdev, NULL); - - if (uart) - uart_remove_one_port(&bfin_serial_reg, &uart->port); - - return 0; -} - -static struct platform_driver bfin_serial_driver = { - .probe = bfin_serial_probe, - .remove = bfin_serial_remove, - .suspend = bfin_serial_suspend, - .resume = bfin_serial_resume, - .driver = { - .name = "bfin-uart", - }, -}; - -static int __init bfin_serial_init(void) -{ - int ret; - - pr_info("Serial: Blackfin serial driver\n"); - - bfin_serial_init_ports(); - - ret = uart_register_driver(&bfin_serial_reg); - if (ret == 0) { - ret = platform_driver_register(&bfin_serial_driver); - if (ret) { - pr_debug("uart register failed\n"); - uart_unregister_driver(&bfin_serial_reg); - } - } - return ret; -} - -static void __exit bfin_serial_exit(void) -{ - platform_driver_unregister(&bfin_serial_driver); - uart_unregister_driver(&bfin_serial_reg); -} - -module_init(bfin_serial_init); -module_exit(bfin_serial_exit); - -MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>"); -MODULE_DESCRIPTION("Blackfin generic serial port driver"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR); |