--- /dev/null
+/*
+ * 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);
projects / linux-2.6 / commitdiff