diff options
Diffstat (limited to 'drivers/serial/bfin_5xx.c')
| -rw-r--r-- | drivers/serial/bfin_5xx.c | 1012 |
1 files changed, 1012 insertions, 0 deletions
diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c new file mode 100644 index 000000000000..408390f93db9 --- /dev/null +++ b/drivers/serial/bfin_5xx.c @@ -0,0 +1,1012 @@ +/* + * 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); |