bfin_5xx.c is not a general name for all Blackfin chips.
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Add support for the built-in UARTs on the Blackfin.
To compile this driver as a module, choose M here: the
- module will be called bfin_5xx.
+ module is named bfin_uart.ko.
config SERIAL_BFIN_CONSOLE
bool "Console on Blackfin serial port"
obj-$(CONFIG_SERIAL_PNX8XXX) += pnx8xxx_uart.o
obj-$(CONFIG_SERIAL_SA1100) += sa1100.o
obj-$(CONFIG_SERIAL_BCM63XX) += bcm63xx_uart.o
-obj-$(CONFIG_SERIAL_BFIN) += bfin_5xx.o
+obj-$(CONFIG_SERIAL_BFIN) += bfin_uart.o
obj-$(CONFIG_SERIAL_BFIN_SPORT) += bfin_sport_uart.o
obj-$(CONFIG_SERIAL_SAMSUNG) += samsung.o
obj-$(CONFIG_SERIAL_S3C2410) += s3c2410.o
+++ /dev/null
-/*
- * Blackfin On-Chip Serial Driver
- *
- * Copyright 2006-2010 Analog Devices Inc.
- *
- * Enter bugs at http://blackfin.uclinux.org/
- *
- * Licensed under the GPL-2 or later.
- */
-
-#if defined(CONFIG_SERIAL_BFIN_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
-#define SUPPORT_SYSRQ
-#endif
-
-#define DRIVER_NAME "bfin-uart"
-#define pr_fmt(fmt) DRIVER_NAME ": " fmt
-
-#include <linux/module.h>
-#include <linux/ioport.h>
-#include <linux/gfp.h>
-#include <linux/io.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 <linux/gpio.h>
-#include <linux/irq.h>
-#include <linux/kgdb.h>
-#include <linux/slab.h>
-#include <linux/dma-mapping.h>
-
-#include <asm/portmux.h>
-#include <asm/cacheflush.h>
-#include <asm/dma.h>
-
-#define port_membase(uart) (((struct bfin_serial_port *)(uart))->port.membase)
-#define get_lsr_cache(uart) (((struct bfin_serial_port *)(uart))->lsr)
-#define put_lsr_cache(uart, v) (((struct bfin_serial_port *)(uart))->lsr = (v))
-#include <asm/bfin_serial.h>
-
-#ifdef CONFIG_SERIAL_BFIN_MODULE
-# undef CONFIG_EARLY_PRINTK
-#endif
-
-#ifdef CONFIG_SERIAL_BFIN_MODULE
-# undef CONFIG_EARLY_PRINTK
-#endif
-
-/* UART name and device definitions */
-#define BFIN_SERIAL_DEV_NAME "ttyBF"
-#define BFIN_SERIAL_MAJOR 204
-#define BFIN_SERIAL_MINOR 64
-
-static struct bfin_serial_port *bfin_serial_ports[BFIN_UART_NR_PORTS];
-
-#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
- defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
-
-# ifndef CONFIG_SERIAL_BFIN_PIO
-# error KGDB only support UART in PIO mode.
-# endif
-
-static int kgdboc_port_line;
-static int kgdboc_break_enabled;
-#endif
-/*
- * 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 (HZ / 50)
-
-#ifdef CONFIG_SERIAL_BFIN_DMA
-static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
-#else
-static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
-#endif
-
-static void bfin_serial_reset_irda(struct uart_port *port);
-
-#if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
- defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
-static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
-{
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
- if (uart->cts_pin < 0)
- return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
-
- /* CTS PIN is negative assertive. */
- if (UART_GET_CTS(uart))
- return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
- else
- return TIOCM_DSR | TIOCM_CAR;
-}
-
-static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
-{
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
- if (uart->rts_pin < 0)
- return;
-
- /* RTS PIN is negative assertive. */
- if (mctrl & TIOCM_RTS)
- UART_ENABLE_RTS(uart);
- else
- UART_DISABLE_RTS(uart);
-}
-
-/*
- * Handle any change of modem status signal.
- */
-static irqreturn_t bfin_serial_mctrl_cts_int(int irq, void *dev_id)
-{
- struct bfin_serial_port *uart = dev_id;
- unsigned int status;
-
- status = bfin_serial_get_mctrl(&uart->port);
- uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
-#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
- uart->scts = 1;
- UART_CLEAR_SCTS(uart);
- UART_CLEAR_IER(uart, EDSSI);
-#endif
-
- return IRQ_HANDLED;
-}
-#else
-static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
-{
- return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
-}
-
-static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
-{
-}
-#endif
-
-/*
- * 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
- struct circ_buf *xmit = &uart->port.state->xmit;
-#endif
-
- while (!(UART_GET_LSR(uart) & TEMT))
- cpu_relax();
-
-#ifdef CONFIG_SERIAL_BFIN_DMA
- disable_dma(uart->tx_dma_channel);
- xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
- uart->port.icount.tx += uart->tx_count;
- uart->tx_count = 0;
- uart->tx_done = 1;
-#else
-#ifdef CONFIG_BF54x
- /* Clear TFI bit */
- UART_PUT_LSR(uart, TFI);
-#endif
- UART_CLEAR_IER(uart, ETBEI);
-#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;
- struct tty_struct *tty = uart->port.state->port.tty;
-
-#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
- if (uart->scts && !(bfin_serial_get_mctrl(&uart->port) & TIOCM_CTS)) {
- uart->scts = 0;
- uart_handle_cts_change(&uart->port, uart->scts);
- }
-#endif
-
- /*
- * To avoid losting RX interrupt, we reset IR function
- * before sending data.
- */
- if (tty->termios->c_line == N_IRDA)
- bfin_serial_reset_irda(port);
-
-#ifdef CONFIG_SERIAL_BFIN_DMA
- if (uart->tx_done)
- bfin_serial_dma_tx_chars(uart);
-#else
- UART_SET_IER(uart, ETBEI);
- 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;
-
- UART_CLEAR_IER(uart, ERBFI);
-}
-
-/*
- * Set the modem control timer to fire immediately.
- */
-static void bfin_serial_enable_ms(struct uart_port *port)
-{
-}
-
-
-#if ANOMALY_05000363 && defined(CONFIG_SERIAL_BFIN_PIO)
-# define UART_GET_ANOMALY_THRESHOLD(uart) ((uart)->anomaly_threshold)
-# define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v))
-#else
-# define UART_GET_ANOMALY_THRESHOLD(uart) 0
-# define UART_SET_ANOMALY_THRESHOLD(uart, v)
-#endif
-
-#ifdef CONFIG_SERIAL_BFIN_PIO
-static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
-{
- struct tty_struct *tty = NULL;
- unsigned int status, ch, flg;
- static struct timeval anomaly_start = { .tv_sec = 0 };
-
- status = UART_GET_LSR(uart);
- UART_CLEAR_LSR(uart);
-
- ch = UART_GET_CHAR(uart);
- uart->port.icount.rx++;
-
-#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
- defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
- if (kgdb_connected && kgdboc_port_line == uart->port.line
- && kgdboc_break_enabled)
- if (ch == 0x3) {/* Ctrl + C */
- kgdb_breakpoint();
- return;
- }
-
- if (!uart->port.state || !uart->port.state->port.tty)
- return;
-#endif
- tty = uart->port.state->port.tty;
-
- if (ANOMALY_05000363) {
- /* The BF533 (and BF561) family of processors have a nice anomaly
- * where they continuously generate characters for a "single" break.
- * We have to basically ignore this flood until the "next" valid
- * character comes across. Due to the nature of the flood, it is
- * not possible to reliably catch bytes that are sent too quickly
- * after this break. So application code talking to the Blackfin
- * which sends a break signal must allow at least 1.5 character
- * times after the end of the break for things to stabilize. This
- * timeout was picked as it must absolutely be larger than 1
- * character time +/- some percent. So 1.5 sounds good. All other
- * Blackfin families operate properly. Woo.
- */
- if (anomaly_start.tv_sec) {
- struct timeval curr;
- suseconds_t usecs;
-
- if ((~ch & (~ch + 1)) & 0xff)
- goto known_good_char;
-
- do_gettimeofday(&curr);
- if (curr.tv_sec - anomaly_start.tv_sec > 1)
- goto known_good_char;
-
- usecs = 0;
- if (curr.tv_sec != anomaly_start.tv_sec)
- usecs += USEC_PER_SEC;
- usecs += curr.tv_usec - anomaly_start.tv_usec;
-
- if (usecs > UART_GET_ANOMALY_THRESHOLD(uart))
- goto known_good_char;
-
- if (ch)
- anomaly_start.tv_sec = 0;
- else
- anomaly_start = curr;
-
- return;
-
- known_good_char:
- status &= ~BI;
- anomaly_start.tv_sec = 0;
- }
- }
-
- if (status & BI) {
- if (ANOMALY_05000363)
- if (bfin_revid() < 5)
- do_gettimeofday(&anomaly_start);
- uart->port.icount.brk++;
- if (uart_handle_break(&uart->port))
- goto ignore_char;
- status &= ~(PE | FE);
- }
- if (status & PE)
- uart->port.icount.parity++;
- if (status & OE)
- uart->port.icount.overrun++;
- if (status & FE)
- uart->port.icount.frame++;
-
- status &= uart->port.read_status_mask;
-
- if (status & BI)
- flg = TTY_BREAK;
- else if (status & PE)
- flg = TTY_PARITY;
- else if (status & FE)
- flg = TTY_FRAME;
- else
- flg = TTY_NORMAL;
-
- if (uart_handle_sysrq_char(&uart->port, ch))
- goto ignore_char;
-
- uart_insert_char(&uart->port, status, OE, ch, flg);
-
- ignore_char:
- tty_flip_buffer_push(tty);
-}
-
-static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
-{
- struct circ_buf *xmit = &uart->port.state->xmit;
-
- if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
-#ifdef CONFIG_BF54x
- /* Clear TFI bit */
- UART_PUT_LSR(uart, TFI);
-#endif
- /* Anomaly notes:
- * 05000215 - we always clear ETBEI within last UART TX
- * interrupt to end a string. It is always set
- * when start a new tx.
- */
- UART_CLEAR_IER(uart, ETBEI);
- return;
- }
-
- if (uart->port.x_char) {
- UART_PUT_CHAR(uart, uart->port.x_char);
- uart->port.icount.tx++;
- uart->port.x_char = 0;
- }
-
- while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
- UART_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);
-}
-
-static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
-{
- struct bfin_serial_port *uart = dev_id;
-
- while (UART_GET_LSR(uart) & DR)
- bfin_serial_rx_chars(uart);
-
- return IRQ_HANDLED;
-}
-
-static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
-{
- struct bfin_serial_port *uart = dev_id;
-
-#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
- if (uart->scts && !(bfin_serial_get_mctrl(&uart->port) & TIOCM_CTS)) {
- uart->scts = 0;
- uart_handle_cts_change(&uart->port, uart->scts);
- }
-#endif
- spin_lock(&uart->port.lock);
- if (UART_GET_LSR(uart) & THRE)
- bfin_serial_tx_chars(uart);
- spin_unlock(&uart->port.lock);
-
- return IRQ_HANDLED;
-}
-#endif
-
-#ifdef CONFIG_SERIAL_BFIN_DMA
-static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
-{
- struct circ_buf *xmit = &uart->port.state->xmit;
-
- uart->tx_done = 0;
-
- if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
- uart->tx_count = 0;
- uart->tx_done = 1;
- return;
- }
-
- if (uart->port.x_char) {
- UART_PUT_CHAR(uart, uart->port.x_char);
- uart->port.icount.tx++;
- uart->port.x_char = 0;
- }
-
- 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,
- DMA_SYNC_RESTART));
- 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);
- SSYNC();
- enable_dma(uart->tx_dma_channel);
-
- UART_SET_IER(uart, ETBEI);
-}
-
-static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
-{
- struct tty_struct *tty = uart->port.state->port.tty;
- int i, flg, status;
-
- status = UART_GET_LSR(uart);
- UART_CLEAR_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;
- status &= ~(PE | FE);
- }
- if (status & PE)
- uart->port.icount.parity++;
- if (status & OE)
- uart->port.icount.overrun++;
- if (status & FE)
- uart->port.icount.frame++;
-
- status &= uart->port.read_status_mask;
-
- if (status & BI)
- flg = TTY_BREAK;
- else if (status & PE)
- flg = TTY_PARITY;
- else if (status & FE)
- flg = TTY_FRAME;
- else
- flg = TTY_NORMAL;
-
- for (i = uart->rx_dma_buf.tail; ; i++) {
- if (i >= UART_XMIT_SIZE)
- i = 0;
- if (i == uart->rx_dma_buf.head)
- break;
- if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
- uart_insert_char(&uart->port, status, OE,
- 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;
-
- dma_disable_irq_nosync(uart->rx_dma_channel);
- spin_lock_bh(&uart->rx_lock);
-
- /* 2D DMA RX buffer ring is used. Because curr_y_count and
- * curr_x_count can't be read as an atomic operation,
- * curr_y_count should be read before curr_x_count. When
- * curr_x_count is read, curr_y_count may already indicate
- * next buffer line. But, the position calculated here is
- * still indicate the old line. The wrong position data may
- * be smaller than current buffer tail, which cause garbages
- * are received if it is not prohibit.
- */
- uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
- x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
- uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
- if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
- uart->rx_dma_nrows = 0;
- x_pos = DMA_RX_XCOUNT - x_pos;
- if (x_pos == DMA_RX_XCOUNT)
- x_pos = 0;
-
- pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
- /* Ignore receiving data if new position is in the same line of
- * current buffer tail and small.
- */
- if (pos > uart->rx_dma_buf.tail ||
- uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
- uart->rx_dma_buf.head = pos;
- bfin_serial_dma_rx_chars(uart);
- uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
- }
-
- spin_unlock_bh(&uart->rx_lock);
- dma_enable_irq(uart->rx_dma_channel);
-
- mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
-}
-
-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.state->xmit;
-
-#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
- if (uart->scts && !(bfin_serial_get_mctrl(&uart->port)&TIOCM_CTS)) {
- uart->scts = 0;
- uart_handle_cts_change(&uart->port, uart->scts);
- }
-#endif
-
- spin_lock(&uart->port.lock);
- if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
- disable_dma(uart->tx_dma_channel);
- clear_dma_irqstat(uart->tx_dma_channel);
- /* Anomaly notes:
- * 05000215 - we always clear ETBEI within last UART TX
- * interrupt to end a string. It is always set
- * when start a new tx.
- */
- UART_CLEAR_IER(uart, ETBEI);
- 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);
-
- bfin_serial_dma_tx_chars(uart);
- }
-
- 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;
- int x_pos, pos;
-
- spin_lock(&uart->rx_lock);
- irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
- clear_dma_irqstat(uart->rx_dma_channel);
-
- uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
- x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
- uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
- if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
- uart->rx_dma_nrows = 0;
-
- pos = uart->rx_dma_nrows * DMA_RX_XCOUNT;
- if (pos > uart->rx_dma_buf.tail ||
- uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
- uart->rx_dma_buf.head = pos;
- bfin_serial_dma_rx_chars(uart);
- uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
- }
-
- spin_unlock(&uart->rx_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 void bfin_serial_break_ctl(struct uart_port *port, int break_state)
-{
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
- u16 lcr = UART_GET_LCR(uart);
- if (break_state)
- lcr |= SB;
- else
- lcr &= ~SB;
- UART_PUT_LCR(uart, lcr);
- SSYNC();
-}
-
-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,
- DMA_SYNC_RESTART));
- 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 defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
- defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
- if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)
- kgdboc_break_enabled = 0;
- else {
-# endif
- if (request_irq(uart->port.irq, bfin_serial_rx_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_tx_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;
- }
-
-# ifdef CONFIG_BF54x
- {
- /*
- * UART2 and UART3 on BF548 share interrupt PINs and DMA
- * controllers with SPORT2 and SPORT3. UART rx and tx
- * interrupts are generated in PIO mode only when configure
- * their peripheral mapping registers properly, which means
- * request corresponding DMA channels in PIO mode as well.
- */
- unsigned uart_dma_ch_rx, uart_dma_ch_tx;
-
- switch (uart->port.irq) {
- case IRQ_UART3_RX:
- uart_dma_ch_rx = CH_UART3_RX;
- uart_dma_ch_tx = CH_UART3_TX;
- break;
- case IRQ_UART2_RX:
- uart_dma_ch_rx = CH_UART2_RX;
- uart_dma_ch_tx = CH_UART2_TX;
- break;
- default:
- uart_dma_ch_rx = uart_dma_ch_tx = 0;
- break;
- };
-
- if (uart_dma_ch_rx &&
- request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) {
- printk(KERN_NOTICE"Fail to attach UART interrupt\n");
- free_irq(uart->port.irq, uart);
- free_irq(uart->port.irq + 1, uart);
- return -EBUSY;
- }
- if (uart_dma_ch_tx &&
- request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) {
- printk(KERN_NOTICE "Fail to attach UART interrupt\n");
- free_dma(uart_dma_ch_rx);
- free_irq(uart->port.irq, uart);
- free_irq(uart->port.irq + 1, uart);
- return -EBUSY;
- }
- }
-# endif
-# if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
- defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
- }
-# endif
-#endif
-
-#ifdef CONFIG_SERIAL_BFIN_CTSRTS
- if (uart->cts_pin >= 0) {
- if (request_irq(gpio_to_irq(uart->cts_pin),
- bfin_serial_mctrl_cts_int,
- IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
- IRQF_DISABLED, "BFIN_UART_CTS", uart)) {
- uart->cts_pin = -1;
- pr_info("Unable to attach BlackFin UART CTS interrupt. So, disable it.\n");
- }
- }
- if (uart->rts_pin >= 0)
- gpio_direction_output(uart->rts_pin, 0);
-#endif
-#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
- if (uart->cts_pin >= 0 && request_irq(uart->status_irq,
- bfin_serial_mctrl_cts_int,
- IRQF_DISABLED, "BFIN_UART_MODEM_STATUS", uart)) {
- uart->cts_pin = -1;
- pr_info("Unable to attach BlackFin UART Modem Status interrupt.\n");
- }
-
- /* CTS RTS PINs are negative assertive. */
- UART_PUT_MCR(uart, ACTS);
- UART_SET_IER(uart, EDSSI);
-#endif
-
- UART_SET_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));
- dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
-#else
-#ifdef CONFIG_BF54x
- switch (uart->port.irq) {
- case IRQ_UART3_RX:
- free_dma(CH_UART3_RX);
- free_dma(CH_UART3_TX);
- break;
- case IRQ_UART2_RX:
- free_dma(CH_UART2_RX);
- free_dma(CH_UART2_TX);
- break;
- default:
- break;
- };
-#endif
- free_irq(uart->port.irq, uart);
- free_irq(uart->port.irq+1, uart);
-#endif
-
-#ifdef CONFIG_SERIAL_BFIN_CTSRTS
- if (uart->cts_pin >= 0)
- free_irq(gpio_to_irq(uart->cts_pin), uart);
-#endif
-#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
- if (uart->cts_pin >= 0)
- free_irq(uart->status_irq, 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, 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",
- __func__);
- }
-
- /* Anomaly notes:
- * 05000231 - STOP bit is always set to 1 whatever the user is set.
- */
- if (termios->c_cflag & CSTOPB) {
- if (ANOMALY_05000231)
- printk(KERN_WARNING "STOP bits other than 1 is not "
- "supported in case of anomaly 05000231.\n");
- else
- lcr |= STB;
- }
- if (termios->c_cflag & PARENB)
- lcr |= PEN;
- if (!(termios->c_cflag & PARODD))
- lcr |= EPS;
- if (termios->c_cflag & CMSPAR)
- lcr |= STP;
-
- spin_lock_irqsave(&uart->port.lock, flags);
-
- port->read_status_mask = OE;
- if (termios->c_iflag & INPCK)
- port->read_status_mask |= (FE | PE);
- if (termios->c_iflag & (BRKINT | PARMRK))
- port->read_status_mask |= BI;
-
- /*
- * Characters to ignore
- */
- port->ignore_status_mask = 0;
- if (termios->c_iflag & IGNPAR)
- port->ignore_status_mask |= FE | PE;
- if (termios->c_iflag & IGNBRK) {
- port->ignore_status_mask |= BI;
- /*
- * If we're ignoring parity and break indicators,
- * ignore overruns too (for real raw support).
- */
- if (termios->c_iflag & IGNPAR)
- port->ignore_status_mask |= OE;
- }
-
- baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
- quot = uart_get_divisor(port, baud);
-
- /* If discipline is not IRDA, apply ANOMALY_05000230 */
- if (termios->c_line != N_IRDA)
- quot -= ANOMALY_05000230;
-
- UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
-
- /* Disable UART */
- ier = UART_GET_IER(uart);
- UART_DISABLE_INTS(uart);
-
- /* Set DLAB in LCR to Access DLL and DLH */
- UART_SET_DLAB(uart);
-
- UART_PUT_DLL(uart, quot & 0xFF);
- UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
- SSYNC();
-
- /* Clear DLAB in LCR to Access THR RBR IER */
- UART_CLEAR_DLAB(uart);
-
- UART_PUT_LCR(uart, lcr);
-
- /* Enable UART */
- UART_ENABLE_INTS(uart, ier);
-
- val = UART_GET_GCTL(uart);
- val |= UCEN;
- UART_PUT_GCTL(uart, val);
-
- /* Port speed changed, update the per-port timeout. */
- uart_update_timeout(port, termios->c_cflag, baud);
-
- 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;
-}
-
-/*
- * Enable the IrDA function if tty->ldisc.num is N_IRDA.
- * In other cases, disable IrDA function.
- */
-static void bfin_serial_set_ldisc(struct uart_port *port, int ld)
-{
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
- unsigned short val;
-
- switch (ld) {
- case N_IRDA:
- val = UART_GET_GCTL(uart);
- val |= (IREN | RPOLC);
- UART_PUT_GCTL(uart, val);
- break;
- default:
- val = UART_GET_GCTL(uart);
- val &= ~(IREN | RPOLC);
- UART_PUT_GCTL(uart, val);
- }
-}
-
-static void bfin_serial_reset_irda(struct uart_port *port)
-{
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
- unsigned short val;
-
- val = UART_GET_GCTL(uart);
- val &= ~(IREN | RPOLC);
- UART_PUT_GCTL(uart, val);
- SSYNC();
- val |= (IREN | RPOLC);
- UART_PUT_GCTL(uart, val);
- SSYNC();
-}
-
-#ifdef CONFIG_CONSOLE_POLL
-/* Anomaly notes:
- * 05000099 - Because we only use THRE in poll_put and DR in poll_get,
- * losing other bits of UART_LSR is not a problem here.
- */
-static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr)
-{
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
-
- while (!(UART_GET_LSR(uart) & THRE))
- cpu_relax();
-
- UART_CLEAR_DLAB(uart);
- UART_PUT_CHAR(uart, (unsigned char)chr);
-}
-
-static int bfin_serial_poll_get_char(struct uart_port *port)
-{
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
- unsigned char chr;
-
- while (!(UART_GET_LSR(uart) & DR))
- cpu_relax();
-
- UART_CLEAR_DLAB(uart);
- chr = UART_GET_CHAR(uart);
-
- return chr;
-}
-#endif
-
-#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
- defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
-static void bfin_kgdboc_port_shutdown(struct uart_port *port)
-{
- if (kgdboc_break_enabled) {
- kgdboc_break_enabled = 0;
- bfin_serial_shutdown(port);
- }
-}
-
-static int bfin_kgdboc_port_startup(struct uart_port *port)
-{
- kgdboc_port_line = port->line;
- kgdboc_break_enabled = !bfin_serial_startup(port);
- return 0;
-}
-#endif
-
-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,
- .set_ldisc = bfin_serial_set_ldisc,
- .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,
-#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
- defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
- .kgdboc_port_startup = bfin_kgdboc_port_startup,
- .kgdboc_port_shutdown = bfin_kgdboc_port_shutdown,
-#endif
-#ifdef CONFIG_CONSOLE_POLL
- .poll_put_char = bfin_serial_poll_put_char,
- .poll_get_char = bfin_serial_poll_get_char,
-#endif
-};
-
-#if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
-/*
- * 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 */
- u16 lcr, 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 */
- UART_SET_DLAB(uart);
-
- dll = UART_GET_DLL(uart);
- dlh = UART_GET_DLH(uart);
-
- /* Clear DLAB in LCR to Access THR RBR IER */
- UART_CLEAR_DLAB(uart);
-
- *baud = get_sclk() / (16*(dll | dlh << 8));
- }
- pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits);
-}
-
-static struct uart_driver bfin_serial_reg;
-
-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) & THRE))
- barrier();
- UART_PUT_CHAR(uart, ch);
-}
-
-#endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
- defined (CONFIG_EARLY_PRINTK) */
-
-#ifdef CONFIG_SERIAL_BFIN_CONSOLE
-#define CLASS_BFIN_CONSOLE "bfin-console"
-/*
- * 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];
- unsigned long flags;
-
- 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);
-
-}
-
-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';
-# if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
- defined(CONFIG_SERIAL_BFIN_HARD_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 < 0 || co->index >= BFIN_UART_NR_PORTS)
- return -ENODEV;
-
- uart = bfin_serial_ports[co->index];
- if (!uart)
- return -ENODEV;
-
- 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 console bfin_serial_console = {
- .name = BFIN_SERIAL_DEV_NAME,
- .write = bfin_serial_console_write,
- .device = uart_console_device,
- .setup = bfin_serial_console_setup,
- .flags = CON_PRINTBUFFER,
- .index = -1,
- .data = &bfin_serial_reg,
-};
-#define BFIN_SERIAL_CONSOLE (&bfin_serial_console)
-#else
-#define BFIN_SERIAL_CONSOLE NULL
-#endif /* CONFIG_SERIAL_BFIN_CONSOLE */
-
-#ifdef CONFIG_EARLY_PRINTK
-static struct bfin_serial_port bfin_earlyprintk_port;
-#define CLASS_BFIN_EARLYPRINTK "bfin-earlyprintk"
-
-/*
- * Interrupts are disabled on entering
- */
-static void
-bfin_earlyprintk_console_write(struct console *co, const char *s, unsigned int count)
-{
- unsigned long flags;
-
- if (bfin_earlyprintk_port.port.line != co->index)
- return;
-
- spin_lock_irqsave(&bfin_earlyprintk_port.port.lock, flags);
- uart_console_write(&bfin_earlyprintk_port.port, s, count,
- bfin_serial_console_putchar);
- spin_unlock_irqrestore(&bfin_earlyprintk_port.port.lock, flags);
-}
-
-/*
- * This should have a .setup or .early_setup in it, but then things get called
- * without the command line options, and the baud rate gets messed up - so
- * don't let the common infrastructure play with things. (see calls to setup
- * & earlysetup in ./kernel/printk.c:register_console()
- */
-static struct __initdata console bfin_early_serial_console = {
- .name = "early_BFuart",
- .write = bfin_earlyprintk_console_write,
- .device = uart_console_device,
- .flags = CON_PRINTBUFFER,
- .index = -1,
- .data = &bfin_serial_reg,
-};
-#endif
-
-static struct uart_driver bfin_serial_reg = {
- .owner = THIS_MODULE,
- .driver_name = DRIVER_NAME,
- .dev_name = BFIN_SERIAL_DEV_NAME,
- .major = BFIN_SERIAL_MAJOR,
- .minor = BFIN_SERIAL_MINOR,
- .nr = BFIN_UART_NR_PORTS,
- .cons = BFIN_SERIAL_CONSOLE,
-};
-
-static int bfin_serial_suspend(struct platform_device *pdev, pm_message_t state)
-{
- struct bfin_serial_port *uart = platform_get_drvdata(pdev);
-
- return uart_suspend_port(&bfin_serial_reg, &uart->port);
-}
-
-static int bfin_serial_resume(struct platform_device *pdev)
-{
- struct bfin_serial_port *uart = platform_get_drvdata(pdev);
-
- return uart_resume_port(&bfin_serial_reg, &uart->port);
-}
-
-static int bfin_serial_probe(struct platform_device *pdev)
-{
- struct resource *res;
- struct bfin_serial_port *uart = NULL;
- int ret = 0;
-
- if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
- dev_err(&pdev->dev, "Wrong bfin uart platform device id.\n");
- return -ENOENT;
- }
-
- if (bfin_serial_ports[pdev->id] == NULL) {
-
- uart = kzalloc(sizeof(*uart), GFP_KERNEL);
- if (!uart) {
- dev_err(&pdev->dev,
- "fail to malloc bfin_serial_port\n");
- return -ENOMEM;
- }
- bfin_serial_ports[pdev->id] = uart;
-
-#ifdef CONFIG_EARLY_PRINTK
- if (!(bfin_earlyprintk_port.port.membase
- && bfin_earlyprintk_port.port.line == pdev->id)) {
- /*
- * If the peripheral PINs of current port is allocated
- * in earlyprintk probe stage, don't do it again.
- */
-#endif
- ret = peripheral_request_list(
- (unsigned short *)pdev->dev.platform_data, DRIVER_NAME);
- if (ret) {
- dev_err(&pdev->dev,
- "fail to request bfin serial peripherals\n");
- goto out_error_free_mem;
- }
-#ifdef CONFIG_EARLY_PRINTK
- }
-#endif
-
- spin_lock_init(&uart->port.lock);
- uart->port.uartclk = get_sclk();
- uart->port.fifosize = BFIN_UART_TX_FIFO_SIZE;
- uart->port.ops = &bfin_serial_pops;
- uart->port.line = pdev->id;
- uart->port.iotype = UPIO_MEM;
- uart->port.flags = UPF_BOOT_AUTOCONF;
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (res == NULL) {
- dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
- ret = -ENOENT;
- goto out_error_free_peripherals;
- }
-
- uart->port.membase = ioremap(res->start, resource_size(res));
- if (!uart->port.membase) {
- dev_err(&pdev->dev, "Cannot map uart IO\n");
- ret = -ENXIO;
- goto out_error_free_peripherals;
- }
- uart->port.mapbase = res->start;
-
- uart->port.irq = platform_get_irq(pdev, 0);
- if (uart->port.irq < 0) {
- dev_err(&pdev->dev, "No uart RX/TX IRQ specified\n");
- ret = -ENOENT;
- goto out_error_unmap;
- }
-
- uart->status_irq = platform_get_irq(pdev, 1);
- if (uart->status_irq < 0) {
- dev_err(&pdev->dev, "No uart status IRQ specified\n");
- ret = -ENOENT;
- goto out_error_unmap;
- }
-
-#ifdef CONFIG_SERIAL_BFIN_DMA
- spin_lock_init(&uart->rx_lock);
- uart->tx_done = 1;
- uart->tx_count = 0;
-
- res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
- if (res == NULL) {
- dev_err(&pdev->dev, "No uart TX DMA channel specified\n");
- ret = -ENOENT;
- goto out_error_unmap;
- }
- uart->tx_dma_channel = res->start;
-
- res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
- if (res == NULL) {
- dev_err(&pdev->dev, "No uart RX DMA channel specified\n");
- ret = -ENOENT;
- goto out_error_unmap;
- }
- uart->rx_dma_channel = res->start;
-
- init_timer(&(uart->rx_dma_timer));
-#endif
-
-#if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
- defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
- res = platform_get_resource(pdev, IORESOURCE_IO, 0);
- if (res == NULL)
- uart->cts_pin = -1;
- else
- uart->cts_pin = res->start;
-
- res = platform_get_resource(pdev, IORESOURCE_IO, 1);
- if (res == NULL)
- uart->rts_pin = -1;
- else
- uart->rts_pin = res->start;
-# if defined(CONFIG_SERIAL_BFIN_CTSRTS)
- if (uart->rts_pin >= 0)
- gpio_request(uart->rts_pin, DRIVER_NAME);
-# endif
-#endif
- }
-
-#ifdef CONFIG_SERIAL_BFIN_CONSOLE
- if (!is_early_platform_device(pdev)) {
-#endif
- uart = bfin_serial_ports[pdev->id];
- uart->port.dev = &pdev->dev;
- dev_set_drvdata(&pdev->dev, uart);
- ret = uart_add_one_port(&bfin_serial_reg, &uart->port);
-#ifdef CONFIG_SERIAL_BFIN_CONSOLE
- }
-#endif
-
- if (!ret)
- return 0;
-
- if (uart) {
-out_error_unmap:
- iounmap(uart->port.membase);
-out_error_free_peripherals:
- peripheral_free_list(
- (unsigned short *)pdev->dev.platform_data);
-out_error_free_mem:
- kfree(uart);
- bfin_serial_ports[pdev->id] = NULL;
- }
-
- return ret;
-}
-
-static int __devexit bfin_serial_remove(struct platform_device *pdev)
-{
- struct bfin_serial_port *uart = platform_get_drvdata(pdev);
-
- dev_set_drvdata(&pdev->dev, NULL);
-
- if (uart) {
- uart_remove_one_port(&bfin_serial_reg, &uart->port);
-#ifdef CONFIG_SERIAL_BFIN_CTSRTS
- if (uart->rts_pin >= 0)
- gpio_free(uart->rts_pin);
-#endif
- iounmap(uart->port.membase);
- peripheral_free_list(
- (unsigned short *)pdev->dev.platform_data);
- kfree(uart);
- bfin_serial_ports[pdev->id] = NULL;
- }
-
- return 0;
-}
-
-static struct platform_driver bfin_serial_driver = {
- .probe = bfin_serial_probe,
- .remove = __devexit_p(bfin_serial_remove),
- .suspend = bfin_serial_suspend,
- .resume = bfin_serial_resume,
- .driver = {
- .name = DRIVER_NAME,
- .owner = THIS_MODULE,
- },
-};
-
-#if defined(CONFIG_SERIAL_BFIN_CONSOLE)
-static __initdata struct early_platform_driver early_bfin_serial_driver = {
- .class_str = CLASS_BFIN_CONSOLE,
- .pdrv = &bfin_serial_driver,
- .requested_id = EARLY_PLATFORM_ID_UNSET,
-};
-
-static int __init bfin_serial_rs_console_init(void)
-{
- early_platform_driver_register(&early_bfin_serial_driver, DRIVER_NAME);
-
- early_platform_driver_probe(CLASS_BFIN_CONSOLE, BFIN_UART_NR_PORTS, 0);
-
- register_console(&bfin_serial_console);
-
- return 0;
-}
-console_initcall(bfin_serial_rs_console_init);
-#endif
-
-#ifdef CONFIG_EARLY_PRINTK
-/*
- * Memory can't be allocated dynamically during earlyprink init stage.
- * So, do individual probe for earlyprink with a static uart port variable.
- */
-static int bfin_earlyprintk_probe(struct platform_device *pdev)
-{
- struct resource *res;
- int ret;
-
- if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
- dev_err(&pdev->dev, "Wrong earlyprintk platform device id.\n");
- return -ENOENT;
- }
-
- ret = peripheral_request_list(
- (unsigned short *)pdev->dev.platform_data, DRIVER_NAME);
- if (ret) {
- dev_err(&pdev->dev,
- "fail to request bfin serial peripherals\n");
- return ret;
- }
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (res == NULL) {
- dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
- ret = -ENOENT;
- goto out_error_free_peripherals;
- }
-
- bfin_earlyprintk_port.port.membase = ioremap(res->start,
- resource_size(res));
- if (!bfin_earlyprintk_port.port.membase) {
- dev_err(&pdev->dev, "Cannot map uart IO\n");
- ret = -ENXIO;
- goto out_error_free_peripherals;
- }
- bfin_earlyprintk_port.port.mapbase = res->start;
- bfin_earlyprintk_port.port.line = pdev->id;
- bfin_earlyprintk_port.port.uartclk = get_sclk();
- bfin_earlyprintk_port.port.fifosize = BFIN_UART_TX_FIFO_SIZE;
- spin_lock_init(&bfin_earlyprintk_port.port.lock);
-
- return 0;
-
-out_error_free_peripherals:
- peripheral_free_list(
- (unsigned short *)pdev->dev.platform_data);
-
- return ret;
-}
-
-static struct platform_driver bfin_earlyprintk_driver = {
- .probe = bfin_earlyprintk_probe,
- .driver = {
- .name = DRIVER_NAME,
- .owner = THIS_MODULE,
- },
-};
-
-static __initdata struct early_platform_driver early_bfin_earlyprintk_driver = {
- .class_str = CLASS_BFIN_EARLYPRINTK,
- .pdrv = &bfin_earlyprintk_driver,
- .requested_id = EARLY_PLATFORM_ID_UNSET,
-};
-
-struct console __init *bfin_earlyserial_init(unsigned int port,
- unsigned int cflag)
-{
- struct ktermios t;
- char port_name[20];
-
- if (port < 0 || port >= BFIN_UART_NR_PORTS)
- return NULL;
-
- /*
- * Only probe resource of the given port in earlyprintk boot arg.
- * The expected port id should be indicated in port name string.
- */
- snprintf(port_name, 20, DRIVER_NAME ".%d", port);
- early_platform_driver_register(&early_bfin_earlyprintk_driver,
- port_name);
- early_platform_driver_probe(CLASS_BFIN_EARLYPRINTK, 1, 0);
-
- if (!bfin_earlyprintk_port.port.membase)
- return NULL;
-
-#ifdef CONFIG_SERIAL_BFIN_CONSOLE
- /*
- * If we are using early serial, don't let the normal console rewind
- * log buffer, since that causes things to be printed multiple times
- */
- bfin_serial_console.flags &= ~CON_PRINTBUFFER;
-#endif
-
- bfin_early_serial_console.index = port;
- t.c_cflag = cflag;
- t.c_iflag = 0;
- t.c_oflag = 0;
- t.c_lflag = ICANON;
- t.c_line = port;
- bfin_serial_set_termios(&bfin_earlyprintk_port.port, &t, &t);
-
- return &bfin_early_serial_console;
-}
-#endif /* CONFIG_EARLY_PRINTK */
-
-static int __init bfin_serial_init(void)
-{
- int ret;
-
- pr_info("Blackfin serial driver\n");
-
- ret = uart_register_driver(&bfin_serial_reg);
- if (ret) {
- pr_err("failed to register %s:%d\n",
- bfin_serial_reg.driver_name, ret);
- }
-
- ret = platform_driver_register(&bfin_serial_driver);
- if (ret) {
- pr_err("fail to register bfin uart\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("Sonic Zhang, Aubrey Li");
-MODULE_DESCRIPTION("Blackfin generic serial port driver");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
-MODULE_ALIAS("platform:bfin-uart");
--- /dev/null
+/*
+ * Blackfin On-Chip Serial Driver
+ *
+ * Copyright 2006-2010 Analog Devices Inc.
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#if defined(CONFIG_SERIAL_BFIN_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#define DRIVER_NAME "bfin-uart"
+#define pr_fmt(fmt) DRIVER_NAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/gfp.h>
+#include <linux/io.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 <linux/gpio.h>
+#include <linux/irq.h>
+#include <linux/kgdb.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+
+#include <asm/portmux.h>
+#include <asm/cacheflush.h>
+#include <asm/dma.h>
+
+#define port_membase(uart) (((struct bfin_serial_port *)(uart))->port.membase)
+#define get_lsr_cache(uart) (((struct bfin_serial_port *)(uart))->lsr)
+#define put_lsr_cache(uart, v) (((struct bfin_serial_port *)(uart))->lsr = (v))
+#include <asm/bfin_serial.h>
+
+#ifdef CONFIG_SERIAL_BFIN_MODULE
+# undef CONFIG_EARLY_PRINTK
+#endif
+
+#ifdef CONFIG_SERIAL_BFIN_MODULE
+# undef CONFIG_EARLY_PRINTK
+#endif
+
+/* UART name and device definitions */
+#define BFIN_SERIAL_DEV_NAME "ttyBF"
+#define BFIN_SERIAL_MAJOR 204
+#define BFIN_SERIAL_MINOR 64
+
+static struct bfin_serial_port *bfin_serial_ports[BFIN_UART_NR_PORTS];
+
+#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
+ defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
+
+# ifndef CONFIG_SERIAL_BFIN_PIO
+# error KGDB only support UART in PIO mode.
+# endif
+
+static int kgdboc_port_line;
+static int kgdboc_break_enabled;
+#endif
+/*
+ * 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 (HZ / 50)
+
+#ifdef CONFIG_SERIAL_BFIN_DMA
+static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
+#else
+static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
+#endif
+
+static void bfin_serial_reset_irda(struct uart_port *port);
+
+#if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
+ defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
+static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
+{
+ struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+ if (uart->cts_pin < 0)
+ return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
+
+ /* CTS PIN is negative assertive. */
+ if (UART_GET_CTS(uart))
+ return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
+ else
+ return TIOCM_DSR | TIOCM_CAR;
+}
+
+static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+ struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+ if (uart->rts_pin < 0)
+ return;
+
+ /* RTS PIN is negative assertive. */
+ if (mctrl & TIOCM_RTS)
+ UART_ENABLE_RTS(uart);
+ else
+ UART_DISABLE_RTS(uart);
+}
+
+/*
+ * Handle any change of modem status signal.
+ */
+static irqreturn_t bfin_serial_mctrl_cts_int(int irq, void *dev_id)
+{
+ struct bfin_serial_port *uart = dev_id;
+ unsigned int status;
+
+ status = bfin_serial_get_mctrl(&uart->port);
+ uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
+#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
+ uart->scts = 1;
+ UART_CLEAR_SCTS(uart);
+ UART_CLEAR_IER(uart, EDSSI);
+#endif
+
+ return IRQ_HANDLED;
+}
+#else
+static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
+{
+ return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
+}
+
+static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+}
+#endif
+
+/*
+ * 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
+ struct circ_buf *xmit = &uart->port.state->xmit;
+#endif
+
+ while (!(UART_GET_LSR(uart) & TEMT))
+ cpu_relax();
+
+#ifdef CONFIG_SERIAL_BFIN_DMA
+ disable_dma(uart->tx_dma_channel);
+ xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
+ uart->port.icount.tx += uart->tx_count;
+ uart->tx_count = 0;
+ uart->tx_done = 1;
+#else
+#ifdef CONFIG_BF54x
+ /* Clear TFI bit */
+ UART_PUT_LSR(uart, TFI);
+#endif
+ UART_CLEAR_IER(uart, ETBEI);
+#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;
+ struct tty_struct *tty = uart->port.state->port.tty;
+
+#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
+ if (uart->scts && !(bfin_serial_get_mctrl(&uart->port) & TIOCM_CTS)) {
+ uart->scts = 0;
+ uart_handle_cts_change(&uart->port, uart->scts);
+ }
+#endif
+
+ /*
+ * To avoid losting RX interrupt, we reset IR function
+ * before sending data.
+ */
+ if (tty->termios->c_line == N_IRDA)
+ bfin_serial_reset_irda(port);
+
+#ifdef CONFIG_SERIAL_BFIN_DMA
+ if (uart->tx_done)
+ bfin_serial_dma_tx_chars(uart);
+#else
+ UART_SET_IER(uart, ETBEI);
+ 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;
+
+ UART_CLEAR_IER(uart, ERBFI);
+}
+
+/*
+ * Set the modem control timer to fire immediately.
+ */
+static void bfin_serial_enable_ms(struct uart_port *port)
+{
+}
+
+
+#if ANOMALY_05000363 && defined(CONFIG_SERIAL_BFIN_PIO)
+# define UART_GET_ANOMALY_THRESHOLD(uart) ((uart)->anomaly_threshold)
+# define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v))
+#else
+# define UART_GET_ANOMALY_THRESHOLD(uart) 0
+# define UART_SET_ANOMALY_THRESHOLD(uart, v)
+#endif
+
+#ifdef CONFIG_SERIAL_BFIN_PIO
+static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
+{
+ struct tty_struct *tty = NULL;
+ unsigned int status, ch, flg;
+ static struct timeval anomaly_start = { .tv_sec = 0 };
+
+ status = UART_GET_LSR(uart);
+ UART_CLEAR_LSR(uart);
+
+ ch = UART_GET_CHAR(uart);
+ uart->port.icount.rx++;
+
+#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
+ defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
+ if (kgdb_connected && kgdboc_port_line == uart->port.line
+ && kgdboc_break_enabled)
+ if (ch == 0x3) {/* Ctrl + C */
+ kgdb_breakpoint();
+ return;
+ }
+
+ if (!uart->port.state || !uart->port.state->port.tty)
+ return;
+#endif
+ tty = uart->port.state->port.tty;
+
+ if (ANOMALY_05000363) {
+ /* The BF533 (and BF561) family of processors have a nice anomaly
+ * where they continuously generate characters for a "single" break.
+ * We have to basically ignore this flood until the "next" valid
+ * character comes across. Due to the nature of the flood, it is
+ * not possible to reliably catch bytes that are sent too quickly
+ * after this break. So application code talking to the Blackfin
+ * which sends a break signal must allow at least 1.5 character
+ * times after the end of the break for things to stabilize. This
+ * timeout was picked as it must absolutely be larger than 1
+ * character time +/- some percent. So 1.5 sounds good. All other
+ * Blackfin families operate properly. Woo.
+ */
+ if (anomaly_start.tv_sec) {
+ struct timeval curr;
+ suseconds_t usecs;
+
+ if ((~ch & (~ch + 1)) & 0xff)
+ goto known_good_char;
+
+ do_gettimeofday(&curr);
+ if (curr.tv_sec - anomaly_start.tv_sec > 1)
+ goto known_good_char;
+
+ usecs = 0;
+ if (curr.tv_sec != anomaly_start.tv_sec)
+ usecs += USEC_PER_SEC;
+ usecs += curr.tv_usec - anomaly_start.tv_usec;
+
+ if (usecs > UART_GET_ANOMALY_THRESHOLD(uart))
+ goto known_good_char;
+
+ if (ch)
+ anomaly_start.tv_sec = 0;
+ else
+ anomaly_start = curr;
+
+ return;
+
+ known_good_char:
+ status &= ~BI;
+ anomaly_start.tv_sec = 0;
+ }
+ }
+
+ if (status & BI) {
+ if (ANOMALY_05000363)
+ if (bfin_revid() < 5)
+ do_gettimeofday(&anomaly_start);
+ uart->port.icount.brk++;
+ if (uart_handle_break(&uart->port))
+ goto ignore_char;
+ status &= ~(PE | FE);
+ }
+ if (status & PE)
+ uart->port.icount.parity++;
+ if (status & OE)
+ uart->port.icount.overrun++;
+ if (status & FE)
+ uart->port.icount.frame++;
+
+ status &= uart->port.read_status_mask;
+
+ if (status & BI)
+ flg = TTY_BREAK;
+ else if (status & PE)
+ flg = TTY_PARITY;
+ else if (status & FE)
+ flg = TTY_FRAME;
+ else
+ flg = TTY_NORMAL;
+
+ if (uart_handle_sysrq_char(&uart->port, ch))
+ goto ignore_char;
+
+ uart_insert_char(&uart->port, status, OE, ch, flg);
+
+ ignore_char:
+ tty_flip_buffer_push(tty);
+}
+
+static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
+{
+ struct circ_buf *xmit = &uart->port.state->xmit;
+
+ if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
+#ifdef CONFIG_BF54x
+ /* Clear TFI bit */
+ UART_PUT_LSR(uart, TFI);
+#endif
+ /* Anomaly notes:
+ * 05000215 - we always clear ETBEI within last UART TX
+ * interrupt to end a string. It is always set
+ * when start a new tx.
+ */
+ UART_CLEAR_IER(uart, ETBEI);
+ return;
+ }
+
+ if (uart->port.x_char) {
+ UART_PUT_CHAR(uart, uart->port.x_char);
+ uart->port.icount.tx++;
+ uart->port.x_char = 0;
+ }
+
+ while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
+ UART_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);
+}
+
+static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
+{
+ struct bfin_serial_port *uart = dev_id;
+
+ while (UART_GET_LSR(uart) & DR)
+ bfin_serial_rx_chars(uart);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
+{
+ struct bfin_serial_port *uart = dev_id;
+
+#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
+ if (uart->scts && !(bfin_serial_get_mctrl(&uart->port) & TIOCM_CTS)) {
+ uart->scts = 0;
+ uart_handle_cts_change(&uart->port, uart->scts);
+ }
+#endif
+ spin_lock(&uart->port.lock);
+ if (UART_GET_LSR(uart) & THRE)
+ bfin_serial_tx_chars(uart);
+ spin_unlock(&uart->port.lock);
+
+ return IRQ_HANDLED;
+}
+#endif
+
+#ifdef CONFIG_SERIAL_BFIN_DMA
+static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
+{
+ struct circ_buf *xmit = &uart->port.state->xmit;
+
+ uart->tx_done = 0;
+
+ if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
+ uart->tx_count = 0;
+ uart->tx_done = 1;
+ return;
+ }
+
+ if (uart->port.x_char) {
+ UART_PUT_CHAR(uart, uart->port.x_char);
+ uart->port.icount.tx++;
+ uart->port.x_char = 0;
+ }
+
+ 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,
+ DMA_SYNC_RESTART));
+ 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);
+ SSYNC();
+ enable_dma(uart->tx_dma_channel);
+
+ UART_SET_IER(uart, ETBEI);
+}
+
+static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
+{
+ struct tty_struct *tty = uart->port.state->port.tty;
+ int i, flg, status;
+
+ status = UART_GET_LSR(uart);
+ UART_CLEAR_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;
+ status &= ~(PE | FE);
+ }
+ if (status & PE)
+ uart->port.icount.parity++;
+ if (status & OE)
+ uart->port.icount.overrun++;
+ if (status & FE)
+ uart->port.icount.frame++;
+
+ status &= uart->port.read_status_mask;
+
+ if (status & BI)
+ flg = TTY_BREAK;
+ else if (status & PE)
+ flg = TTY_PARITY;
+ else if (status & FE)
+ flg = TTY_FRAME;
+ else
+ flg = TTY_NORMAL;
+
+ for (i = uart->rx_dma_buf.tail; ; i++) {
+ if (i >= UART_XMIT_SIZE)
+ i = 0;
+ if (i == uart->rx_dma_buf.head)
+ break;
+ if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
+ uart_insert_char(&uart->port, status, OE,
+ 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;
+
+ dma_disable_irq_nosync(uart->rx_dma_channel);
+ spin_lock_bh(&uart->rx_lock);
+
+ /* 2D DMA RX buffer ring is used. Because curr_y_count and
+ * curr_x_count can't be read as an atomic operation,
+ * curr_y_count should be read before curr_x_count. When
+ * curr_x_count is read, curr_y_count may already indicate
+ * next buffer line. But, the position calculated here is
+ * still indicate the old line. The wrong position data may
+ * be smaller than current buffer tail, which cause garbages
+ * are received if it is not prohibit.
+ */
+ uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
+ x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
+ uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
+ if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
+ uart->rx_dma_nrows = 0;
+ x_pos = DMA_RX_XCOUNT - x_pos;
+ if (x_pos == DMA_RX_XCOUNT)
+ x_pos = 0;
+
+ pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
+ /* Ignore receiving data if new position is in the same line of
+ * current buffer tail and small.
+ */
+ if (pos > uart->rx_dma_buf.tail ||
+ uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
+ uart->rx_dma_buf.head = pos;
+ bfin_serial_dma_rx_chars(uart);
+ uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
+ }
+
+ spin_unlock_bh(&uart->rx_lock);
+ dma_enable_irq(uart->rx_dma_channel);
+
+ mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
+}
+
+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.state->xmit;
+
+#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
+ if (uart->scts && !(bfin_serial_get_mctrl(&uart->port)&TIOCM_CTS)) {
+ uart->scts = 0;
+ uart_handle_cts_change(&uart->port, uart->scts);
+ }
+#endif
+
+ spin_lock(&uart->port.lock);
+ if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
+ disable_dma(uart->tx_dma_channel);
+ clear_dma_irqstat(uart->tx_dma_channel);
+ /* Anomaly notes:
+ * 05000215 - we always clear ETBEI within last UART TX
+ * interrupt to end a string. It is always set
+ * when start a new tx.
+ */
+ UART_CLEAR_IER(uart, ETBEI);
+ 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);
+
+ bfin_serial_dma_tx_chars(uart);
+ }
+
+ 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;
+ int x_pos, pos;
+
+ spin_lock(&uart->rx_lock);
+ irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
+ clear_dma_irqstat(uart->rx_dma_channel);
+
+ uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
+ x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
+ uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
+ if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
+ uart->rx_dma_nrows = 0;
+
+ pos = uart->rx_dma_nrows * DMA_RX_XCOUNT;
+ if (pos > uart->rx_dma_buf.tail ||
+ uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
+ uart->rx_dma_buf.head = pos;
+ bfin_serial_dma_rx_chars(uart);
+ uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
+ }
+
+ spin_unlock(&uart->rx_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 void bfin_serial_break_ctl(struct uart_port *port, int break_state)
+{
+ struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+ u16 lcr = UART_GET_LCR(uart);
+ if (break_state)
+ lcr |= SB;
+ else
+ lcr &= ~SB;
+ UART_PUT_LCR(uart, lcr);
+ SSYNC();
+}
+
+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,
+ DMA_SYNC_RESTART));
+ 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 defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
+ defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
+ if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)
+ kgdboc_break_enabled = 0;
+ else {
+# endif
+ if (request_irq(uart->port.irq, bfin_serial_rx_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_tx_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;
+ }
+
+# ifdef CONFIG_BF54x
+ {
+ /*
+ * UART2 and UART3 on BF548 share interrupt PINs and DMA
+ * controllers with SPORT2 and SPORT3. UART rx and tx
+ * interrupts are generated in PIO mode only when configure
+ * their peripheral mapping registers properly, which means
+ * request corresponding DMA channels in PIO mode as well.
+ */
+ unsigned uart_dma_ch_rx, uart_dma_ch_tx;
+
+ switch (uart->port.irq) {
+ case IRQ_UART3_RX:
+ uart_dma_ch_rx = CH_UART3_RX;
+ uart_dma_ch_tx = CH_UART3_TX;
+ break;
+ case IRQ_UART2_RX:
+ uart_dma_ch_rx = CH_UART2_RX;
+ uart_dma_ch_tx = CH_UART2_TX;
+ break;
+ default:
+ uart_dma_ch_rx = uart_dma_ch_tx = 0;
+ break;
+ };
+
+ if (uart_dma_ch_rx &&
+ request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) {
+ printk(KERN_NOTICE"Fail to attach UART interrupt\n");
+ free_irq(uart->port.irq, uart);
+ free_irq(uart->port.irq + 1, uart);
+ return -EBUSY;
+ }
+ if (uart_dma_ch_tx &&
+ request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) {
+ printk(KERN_NOTICE "Fail to attach UART interrupt\n");
+ free_dma(uart_dma_ch_rx);
+ free_irq(uart->port.irq, uart);
+ free_irq(uart->port.irq + 1, uart);
+ return -EBUSY;
+ }
+ }
+# endif
+# if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
+ defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
+ }
+# endif
+#endif
+
+#ifdef CONFIG_SERIAL_BFIN_CTSRTS
+ if (uart->cts_pin >= 0) {
+ if (request_irq(gpio_to_irq(uart->cts_pin),
+ bfin_serial_mctrl_cts_int,
+ IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
+ IRQF_DISABLED, "BFIN_UART_CTS", uart)) {
+ uart->cts_pin = -1;
+ pr_info("Unable to attach BlackFin UART CTS interrupt. So, disable it.\n");
+ }
+ }
+ if (uart->rts_pin >= 0)
+ gpio_direction_output(uart->rts_pin, 0);
+#endif
+#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
+ if (uart->cts_pin >= 0 && request_irq(uart->status_irq,
+ bfin_serial_mctrl_cts_int,
+ IRQF_DISABLED, "BFIN_UART_MODEM_STATUS", uart)) {
+ uart->cts_pin = -1;
+ pr_info("Unable to attach BlackFin UART Modem Status interrupt.\n");
+ }
+
+ /* CTS RTS PINs are negative assertive. */
+ UART_PUT_MCR(uart, ACTS);
+ UART_SET_IER(uart, EDSSI);
+#endif
+
+ UART_SET_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));
+ dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
+#else
+#ifdef CONFIG_BF54x
+ switch (uart->port.irq) {
+ case IRQ_UART3_RX:
+ free_dma(CH_UART3_RX);
+ free_dma(CH_UART3_TX);
+ break;
+ case IRQ_UART2_RX:
+ free_dma(CH_UART2_RX);
+ free_dma(CH_UART2_TX);
+ break;
+ default:
+ break;
+ };
+#endif
+ free_irq(uart->port.irq, uart);
+ free_irq(uart->port.irq+1, uart);
+#endif
+
+#ifdef CONFIG_SERIAL_BFIN_CTSRTS
+ if (uart->cts_pin >= 0)
+ free_irq(gpio_to_irq(uart->cts_pin), uart);
+#endif
+#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
+ if (uart->cts_pin >= 0)
+ free_irq(uart->status_irq, 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, 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",
+ __func__);
+ }
+
+ /* Anomaly notes:
+ * 05000231 - STOP bit is always set to 1 whatever the user is set.
+ */
+ if (termios->c_cflag & CSTOPB) {
+ if (ANOMALY_05000231)
+ printk(KERN_WARNING "STOP bits other than 1 is not "
+ "supported in case of anomaly 05000231.\n");
+ else
+ lcr |= STB;
+ }
+ if (termios->c_cflag & PARENB)
+ lcr |= PEN;
+ if (!(termios->c_cflag & PARODD))
+ lcr |= EPS;
+ if (termios->c_cflag & CMSPAR)
+ lcr |= STP;
+
+ spin_lock_irqsave(&uart->port.lock, flags);
+
+ port->read_status_mask = OE;
+ if (termios->c_iflag & INPCK)
+ port->read_status_mask |= (FE | PE);
+ if (termios->c_iflag & (BRKINT | PARMRK))
+ port->read_status_mask |= BI;
+
+ /*
+ * Characters to ignore
+ */
+ port->ignore_status_mask = 0;
+ if (termios->c_iflag & IGNPAR)
+ port->ignore_status_mask |= FE | PE;
+ if (termios->c_iflag & IGNBRK) {
+ port->ignore_status_mask |= BI;
+ /*
+ * If we're ignoring parity and break indicators,
+ * ignore overruns too (for real raw support).
+ */
+ if (termios->c_iflag & IGNPAR)
+ port->ignore_status_mask |= OE;
+ }
+
+ baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
+ quot = uart_get_divisor(port, baud);
+
+ /* If discipline is not IRDA, apply ANOMALY_05000230 */
+ if (termios->c_line != N_IRDA)
+ quot -= ANOMALY_05000230;
+
+ UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
+
+ /* Disable UART */
+ ier = UART_GET_IER(uart);
+ UART_DISABLE_INTS(uart);
+
+ /* Set DLAB in LCR to Access DLL and DLH */
+ UART_SET_DLAB(uart);
+
+ UART_PUT_DLL(uart, quot & 0xFF);
+ UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
+ SSYNC();
+
+ /* Clear DLAB in LCR to Access THR RBR IER */
+ UART_CLEAR_DLAB(uart);
+
+ UART_PUT_LCR(uart, lcr);
+
+ /* Enable UART */
+ UART_ENABLE_INTS(uart, ier);
+
+ val = UART_GET_GCTL(uart);
+ val |= UCEN;
+ UART_PUT_GCTL(uart, val);
+
+ /* Port speed changed, update the per-port timeout. */
+ uart_update_timeout(port, termios->c_cflag, baud);
+
+ 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;
+}
+
+/*
+ * Enable the IrDA function if tty->ldisc.num is N_IRDA.
+ * In other cases, disable IrDA function.
+ */
+static void bfin_serial_set_ldisc(struct uart_port *port, int ld)
+{
+ struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+ unsigned short val;
+
+ switch (ld) {
+ case N_IRDA:
+ val = UART_GET_GCTL(uart);
+ val |= (IREN | RPOLC);
+ UART_PUT_GCTL(uart, val);
+ break;
+ default:
+ val = UART_GET_GCTL(uart);
+ val &= ~(IREN | RPOLC);
+ UART_PUT_GCTL(uart, val);
+ }
+}
+
+static void bfin_serial_reset_irda(struct uart_port *port)
+{
+ struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+ unsigned short val;
+
+ val = UART_GET_GCTL(uart);
+ val &= ~(IREN | RPOLC);
+ UART_PUT_GCTL(uart, val);
+ SSYNC();
+ val |= (IREN | RPOLC);
+ UART_PUT_GCTL(uart, val);
+ SSYNC();
+}
+
+#ifdef CONFIG_CONSOLE_POLL
+/* Anomaly notes:
+ * 05000099 - Because we only use THRE in poll_put and DR in poll_get,
+ * losing other bits of UART_LSR is not a problem here.
+ */
+static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr)
+{
+ struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+
+ while (!(UART_GET_LSR(uart) & THRE))
+ cpu_relax();
+
+ UART_CLEAR_DLAB(uart);
+ UART_PUT_CHAR(uart, (unsigned char)chr);
+}
+
+static int bfin_serial_poll_get_char(struct uart_port *port)
+{
+ struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+ unsigned char chr;
+
+ while (!(UART_GET_LSR(uart) & DR))
+ cpu_relax();
+
+ UART_CLEAR_DLAB(uart);
+ chr = UART_GET_CHAR(uart);
+
+ return chr;
+}
+#endif
+
+#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
+ defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
+static void bfin_kgdboc_port_shutdown(struct uart_port *port)
+{
+ if (kgdboc_break_enabled) {
+ kgdboc_break_enabled = 0;
+ bfin_serial_shutdown(port);
+ }
+}
+
+static int bfin_kgdboc_port_startup(struct uart_port *port)
+{
+ kgdboc_port_line = port->line;
+ kgdboc_break_enabled = !bfin_serial_startup(port);
+ return 0;
+}
+#endif
+
+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,
+ .set_ldisc = bfin_serial_set_ldisc,
+ .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,
+#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
+ defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
+ .kgdboc_port_startup = bfin_kgdboc_port_startup,
+ .kgdboc_port_shutdown = bfin_kgdboc_port_shutdown,
+#endif
+#ifdef CONFIG_CONSOLE_POLL
+ .poll_put_char = bfin_serial_poll_put_char,
+ .poll_get_char = bfin_serial_poll_get_char,
+#endif
+};
+
+#if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
+/*
+ * 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 */
+ u16 lcr, 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 */
+ UART_SET_DLAB(uart);
+
+ dll = UART_GET_DLL(uart);
+ dlh = UART_GET_DLH(uart);
+
+ /* Clear DLAB in LCR to Access THR RBR IER */
+ UART_CLEAR_DLAB(uart);
+
+ *baud = get_sclk() / (16*(dll | dlh << 8));
+ }
+ pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits);
+}
+
+static struct uart_driver bfin_serial_reg;
+
+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) & THRE))
+ barrier();
+ UART_PUT_CHAR(uart, ch);
+}
+
+#endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
+ defined (CONFIG_EARLY_PRINTK) */
+
+#ifdef CONFIG_SERIAL_BFIN_CONSOLE
+#define CLASS_BFIN_CONSOLE "bfin-console"
+/*
+ * 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];
+ unsigned long flags;
+
+ 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);
+
+}
+
+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';
+# if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
+ defined(CONFIG_SERIAL_BFIN_HARD_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 < 0 || co->index >= BFIN_UART_NR_PORTS)
+ return -ENODEV;
+
+ uart = bfin_serial_ports[co->index];
+ if (!uart)
+ return -ENODEV;
+
+ 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 console bfin_serial_console = {
+ .name = BFIN_SERIAL_DEV_NAME,
+ .write = bfin_serial_console_write,
+ .device = uart_console_device,
+ .setup = bfin_serial_console_setup,
+ .flags = CON_PRINTBUFFER,
+ .index = -1,
+ .data = &bfin_serial_reg,
+};
+#define BFIN_SERIAL_CONSOLE (&bfin_serial_console)
+#else
+#define BFIN_SERIAL_CONSOLE NULL
+#endif /* CONFIG_SERIAL_BFIN_CONSOLE */
+
+#ifdef CONFIG_EARLY_PRINTK
+static struct bfin_serial_port bfin_earlyprintk_port;
+#define CLASS_BFIN_EARLYPRINTK "bfin-earlyprintk"
+
+/*
+ * Interrupts are disabled on entering
+ */
+static void
+bfin_earlyprintk_console_write(struct console *co, const char *s, unsigned int count)
+{
+ unsigned long flags;
+
+ if (bfin_earlyprintk_port.port.line != co->index)
+ return;
+
+ spin_lock_irqsave(&bfin_earlyprintk_port.port.lock, flags);
+ uart_console_write(&bfin_earlyprintk_port.port, s, count,
+ bfin_serial_console_putchar);
+ spin_unlock_irqrestore(&bfin_earlyprintk_port.port.lock, flags);
+}
+
+/*
+ * This should have a .setup or .early_setup in it, but then things get called
+ * without the command line options, and the baud rate gets messed up - so
+ * don't let the common infrastructure play with things. (see calls to setup
+ * & earlysetup in ./kernel/printk.c:register_console()
+ */
+static struct __initdata console bfin_early_serial_console = {
+ .name = "early_BFuart",
+ .write = bfin_earlyprintk_console_write,
+ .device = uart_console_device,
+ .flags = CON_PRINTBUFFER,
+ .index = -1,
+ .data = &bfin_serial_reg,
+};
+#endif
+
+static struct uart_driver bfin_serial_reg = {
+ .owner = THIS_MODULE,
+ .driver_name = DRIVER_NAME,
+ .dev_name = BFIN_SERIAL_DEV_NAME,
+ .major = BFIN_SERIAL_MAJOR,
+ .minor = BFIN_SERIAL_MINOR,
+ .nr = BFIN_UART_NR_PORTS,
+ .cons = BFIN_SERIAL_CONSOLE,
+};
+
+static int bfin_serial_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ struct bfin_serial_port *uart = platform_get_drvdata(pdev);
+
+ return uart_suspend_port(&bfin_serial_reg, &uart->port);
+}
+
+static int bfin_serial_resume(struct platform_device *pdev)
+{
+ struct bfin_serial_port *uart = platform_get_drvdata(pdev);
+
+ return uart_resume_port(&bfin_serial_reg, &uart->port);
+}
+
+static int bfin_serial_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ struct bfin_serial_port *uart = NULL;
+ int ret = 0;
+
+ if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
+ dev_err(&pdev->dev, "Wrong bfin uart platform device id.\n");
+ return -ENOENT;
+ }
+
+ if (bfin_serial_ports[pdev->id] == NULL) {
+
+ uart = kzalloc(sizeof(*uart), GFP_KERNEL);
+ if (!uart) {
+ dev_err(&pdev->dev,
+ "fail to malloc bfin_serial_port\n");
+ return -ENOMEM;
+ }
+ bfin_serial_ports[pdev->id] = uart;
+
+#ifdef CONFIG_EARLY_PRINTK
+ if (!(bfin_earlyprintk_port.port.membase
+ && bfin_earlyprintk_port.port.line == pdev->id)) {
+ /*
+ * If the peripheral PINs of current port is allocated
+ * in earlyprintk probe stage, don't do it again.
+ */
+#endif
+ ret = peripheral_request_list(
+ (unsigned short *)pdev->dev.platform_data, DRIVER_NAME);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "fail to request bfin serial peripherals\n");
+ goto out_error_free_mem;
+ }
+#ifdef CONFIG_EARLY_PRINTK
+ }
+#endif
+
+ spin_lock_init(&uart->port.lock);
+ uart->port.uartclk = get_sclk();
+ uart->port.fifosize = BFIN_UART_TX_FIFO_SIZE;
+ uart->port.ops = &bfin_serial_pops;
+ uart->port.line = pdev->id;
+ uart->port.iotype = UPIO_MEM;
+ uart->port.flags = UPF_BOOT_AUTOCONF;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (res == NULL) {
+ dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
+ ret = -ENOENT;
+ goto out_error_free_peripherals;
+ }
+
+ uart->port.membase = ioremap(res->start, resource_size(res));
+ if (!uart->port.membase) {
+ dev_err(&pdev->dev, "Cannot map uart IO\n");
+ ret = -ENXIO;
+ goto out_error_free_peripherals;
+ }
+ uart->port.mapbase = res->start;
+
+ uart->port.irq = platform_get_irq(pdev, 0);
+ if (uart->port.irq < 0) {
+ dev_err(&pdev->dev, "No uart RX/TX IRQ specified\n");
+ ret = -ENOENT;
+ goto out_error_unmap;
+ }
+
+ uart->status_irq = platform_get_irq(pdev, 1);
+ if (uart->status_irq < 0) {
+ dev_err(&pdev->dev, "No uart status IRQ specified\n");
+ ret = -ENOENT;
+ goto out_error_unmap;
+ }
+
+#ifdef CONFIG_SERIAL_BFIN_DMA
+ spin_lock_init(&uart->rx_lock);
+ uart->tx_done = 1;
+ uart->tx_count = 0;
+
+ res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+ if (res == NULL) {
+ dev_err(&pdev->dev, "No uart TX DMA channel specified\n");
+ ret = -ENOENT;
+ goto out_error_unmap;
+ }
+ uart->tx_dma_channel = res->start;
+
+ res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
+ if (res == NULL) {
+ dev_err(&pdev->dev, "No uart RX DMA channel specified\n");
+ ret = -ENOENT;
+ goto out_error_unmap;
+ }
+ uart->rx_dma_channel = res->start;
+
+ init_timer(&(uart->rx_dma_timer));
+#endif
+
+#if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
+ defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
+ res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+ if (res == NULL)
+ uart->cts_pin = -1;
+ else
+ uart->cts_pin = res->start;
+
+ res = platform_get_resource(pdev, IORESOURCE_IO, 1);
+ if (res == NULL)
+ uart->rts_pin = -1;
+ else
+ uart->rts_pin = res->start;
+# if defined(CONFIG_SERIAL_BFIN_CTSRTS)
+ if (uart->rts_pin >= 0)
+ gpio_request(uart->rts_pin, DRIVER_NAME);
+# endif
+#endif
+ }
+
+#ifdef CONFIG_SERIAL_BFIN_CONSOLE
+ if (!is_early_platform_device(pdev)) {
+#endif
+ uart = bfin_serial_ports[pdev->id];
+ uart->port.dev = &pdev->dev;
+ dev_set_drvdata(&pdev->dev, uart);
+ ret = uart_add_one_port(&bfin_serial_reg, &uart->port);
+#ifdef CONFIG_SERIAL_BFIN_CONSOLE
+ }
+#endif
+
+ if (!ret)
+ return 0;
+
+ if (uart) {
+out_error_unmap:
+ iounmap(uart->port.membase);
+out_error_free_peripherals:
+ peripheral_free_list(
+ (unsigned short *)pdev->dev.platform_data);
+out_error_free_mem:
+ kfree(uart);
+ bfin_serial_ports[pdev->id] = NULL;
+ }
+
+ return ret;
+}
+
+static int __devexit bfin_serial_remove(struct platform_device *pdev)
+{
+ struct bfin_serial_port *uart = platform_get_drvdata(pdev);
+
+ dev_set_drvdata(&pdev->dev, NULL);
+
+ if (uart) {
+ uart_remove_one_port(&bfin_serial_reg, &uart->port);
+#ifdef CONFIG_SERIAL_BFIN_CTSRTS
+ if (uart->rts_pin >= 0)
+ gpio_free(uart->rts_pin);
+#endif
+ iounmap(uart->port.membase);
+ peripheral_free_list(
+ (unsigned short *)pdev->dev.platform_data);
+ kfree(uart);
+ bfin_serial_ports[pdev->id] = NULL;
+ }
+
+ return 0;
+}
+
+static struct platform_driver bfin_serial_driver = {
+ .probe = bfin_serial_probe,
+ .remove = __devexit_p(bfin_serial_remove),
+ .suspend = bfin_serial_suspend,
+ .resume = bfin_serial_resume,
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ },
+};
+
+#if defined(CONFIG_SERIAL_BFIN_CONSOLE)
+static __initdata struct early_platform_driver early_bfin_serial_driver = {
+ .class_str = CLASS_BFIN_CONSOLE,
+ .pdrv = &bfin_serial_driver,
+ .requested_id = EARLY_PLATFORM_ID_UNSET,
+};
+
+static int __init bfin_serial_rs_console_init(void)
+{
+ early_platform_driver_register(&early_bfin_serial_driver, DRIVER_NAME);
+
+ early_platform_driver_probe(CLASS_BFIN_CONSOLE, BFIN_UART_NR_PORTS, 0);
+
+ register_console(&bfin_serial_console);
+
+ return 0;
+}
+console_initcall(bfin_serial_rs_console_init);
+#endif
+
+#ifdef CONFIG_EARLY_PRINTK
+/*
+ * Memory can't be allocated dynamically during earlyprink init stage.
+ * So, do individual probe for earlyprink with a static uart port variable.
+ */
+static int bfin_earlyprintk_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ int ret;
+
+ if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
+ dev_err(&pdev->dev, "Wrong earlyprintk platform device id.\n");
+ return -ENOENT;
+ }
+
+ ret = peripheral_request_list(
+ (unsigned short *)pdev->dev.platform_data, DRIVER_NAME);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "fail to request bfin serial peripherals\n");
+ return ret;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (res == NULL) {
+ dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
+ ret = -ENOENT;
+ goto out_error_free_peripherals;
+ }
+
+ bfin_earlyprintk_port.port.membase = ioremap(res->start,
+ resource_size(res));
+ if (!bfin_earlyprintk_port.port.membase) {
+ dev_err(&pdev->dev, "Cannot map uart IO\n");
+ ret = -ENXIO;
+ goto out_error_free_peripherals;
+ }
+ bfin_earlyprintk_port.port.mapbase = res->start;
+ bfin_earlyprintk_port.port.line = pdev->id;
+ bfin_earlyprintk_port.port.uartclk = get_sclk();
+ bfin_earlyprintk_port.port.fifosize = BFIN_UART_TX_FIFO_SIZE;
+ spin_lock_init(&bfin_earlyprintk_port.port.lock);
+
+ return 0;
+
+out_error_free_peripherals:
+ peripheral_free_list(
+ (unsigned short *)pdev->dev.platform_data);
+
+ return ret;
+}
+
+static struct platform_driver bfin_earlyprintk_driver = {
+ .probe = bfin_earlyprintk_probe,
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ },
+};
+
+static __initdata struct early_platform_driver early_bfin_earlyprintk_driver = {
+ .class_str = CLASS_BFIN_EARLYPRINTK,
+ .pdrv = &bfin_earlyprintk_driver,
+ .requested_id = EARLY_PLATFORM_ID_UNSET,
+};
+
+struct console __init *bfin_earlyserial_init(unsigned int port,
+ unsigned int cflag)
+{
+ struct ktermios t;
+ char port_name[20];
+
+ if (port < 0 || port >= BFIN_UART_NR_PORTS)
+ return NULL;
+
+ /*
+ * Only probe resource of the given port in earlyprintk boot arg.
+ * The expected port id should be indicated in port name string.
+ */
+ snprintf(port_name, 20, DRIVER_NAME ".%d", port);
+ early_platform_driver_register(&early_bfin_earlyprintk_driver,
+ port_name);
+ early_platform_driver_probe(CLASS_BFIN_EARLYPRINTK, 1, 0);
+
+ if (!bfin_earlyprintk_port.port.membase)
+ return NULL;
+
+#ifdef CONFIG_SERIAL_BFIN_CONSOLE
+ /*
+ * If we are using early serial, don't let the normal console rewind
+ * log buffer, since that causes things to be printed multiple times
+ */
+ bfin_serial_console.flags &= ~CON_PRINTBUFFER;
+#endif
+
+ bfin_early_serial_console.index = port;
+ t.c_cflag = cflag;
+ t.c_iflag = 0;
+ t.c_oflag = 0;
+ t.c_lflag = ICANON;
+ t.c_line = port;
+ bfin_serial_set_termios(&bfin_earlyprintk_port.port, &t, &t);
+
+ return &bfin_early_serial_console;
+}
+#endif /* CONFIG_EARLY_PRINTK */
+
+static int __init bfin_serial_init(void)
+{
+ int ret;
+
+ pr_info("Blackfin serial driver\n");
+
+ ret = uart_register_driver(&bfin_serial_reg);
+ if (ret) {
+ pr_err("failed to register %s:%d\n",
+ bfin_serial_reg.driver_name, ret);
+ }
+
+ ret = platform_driver_register(&bfin_serial_driver);
+ if (ret) {
+ pr_err("fail to register bfin uart\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("Sonic Zhang, Aubrey Li");
+MODULE_DESCRIPTION("Blackfin generic serial port driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
+MODULE_ALIAS("platform:bfin-uart");
projects / linux-2.6-block.git / commitdiff