path: root/drivers/serial/bfin_5xx.c

/*
 * Blackfin On-Chip Serial Driver
 *
 * Copyright 2006-2008 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

#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>

#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
	defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
#include <linux/kgdb.h>
#include <asm/irq_regs.h>
#endif

#include <asm/gpio.h>
#include <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

static struct bfin_serial_port bfin_serial_ports[BFIN_UART_NR_PORTS];
static int nr_active_ports = ARRAY_SIZE(bfin_serial_resource);

#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)
{