#include <linux/serial.h>
#include <asm/dma.h>

#define NR_PORTS		4

#define OFFSET_DLL              0x00	/* Divisor Latch (Low-Byte)             */
#define OFFSET_DLH              0x04	/* Divisor Latch (High-Byte)            */
#define OFFSET_GCTL             0x08	/* Global Control Register              */
#define OFFSET_LCR              0x0C	/* Line Control Register                */
#define OFFSET_MCR              0x10	/* Modem Control Register               */
#define OFFSET_LSR              0x14	/* Line Status Register                 */
#define OFFSET_MSR              0x18	/* Modem Status Register                */
#define OFFSET_SCR              0x1C	/* SCR Scratch Register                 */
#define OFFSET_IER_SET          0x20	/* Set Interrupt Enable Register        */
#define OFFSET_IER_CLEAR        0x24	/* Clear Interrupt Enable Register      */
#define OFFSET_THR              0x28	/* Transmit Holding register            */
#define OFFSET_RBR              0x2C	/* Receive Buffer register              */

#define UART_GET_CHAR(uart)     bfin_read16(((uart)->port.membase + OFFSET_RBR))
#define UART_GET_DLL(uart)	bfin_read16(((uart)->port.membase + OFFSET_DLL))
#define UART_GET_DLH(uart)	bfin_read16(((uart)->port.membase + OFFSET_DLH))
#define UART_GET_IER(uart)      bfin_read16(((uart)->port.membase + OFFSET_IER_SET))
#define UART_GET_LCR(uart)      bfin_read16(((uart)->port.membase + OFFSET_LCR))
#define UART_GET_LSR(uart)      bfin_read16(((uart)->port.membase + OFFSET_LSR))
#define UART_GET_GCTL(uart)     bfin_read16(((uart)->port.membase + OFFSET_GCTL))

#define UART_PUT_CHAR(uart,v)   bfin_write16(((uart)->port.membase + OFFSET_THR),v)
#define UART_PUT_DLL(uart,v)    bfin_write16(((uart)->port.membase + OFFSET_DLL),v)
#define UART_SET_IER(uart,v)    bfin_write16(((uart)->port.membase + OFFSET_IER_SET),v)
#define UART_CLEAR_IER(uart,v)    bfin_write16(((uart)->port.membase + OFFSET_IER_CLEAR),v)
#define UART_PUT_DLH(uart,v)    bfin_write16(((uart)->port.membase + OFFSET_DLH),v)
#define UART_PUT_LSR(uart,v)	bfin_write16(((uart)->port.membase + OFFSET_LSR),v)
#define UART_PUT_LCR(uart,v)    bfin_write16(((uart)->port.membase + OFFSET_LCR),v)
#define UART_PUT_GCTL(uart,v)   bfin_write16(((uart)->port.membase + OFFSET_GCTL),v)

#if defined(CONFIG_BFIN_UART0_CTSRTS) || defined(CONFIG_BFIN_UART1_CTSRTS)
# define CONFIG_SERIAL_BFIN_CTSRTS

# ifndef CONFIG_UART0_CTS_PIN
#  define CONFIG_UART0_CTS_PIN -1
# endif

# ifndef CONFIG_UART0_RTS_PIN
#  define CONFIG_UART0_RTS_PIN -1
# endif

# ifndef CONFIG_UART1_CTS_PIN
#  define CONFIG_UART1_CTS_PIN -1
# endif

# ifndef CONFIG_UART1_RTS_PIN
#  define CONFIG_UART1_RTS_PIN -1
# endif
#endif
/*
 * The pin configuration is different from schematic
 */
struct bfin_serial_port {
        struct uart_port        port;
        unsigned int            old_status;
#ifdef CONFIG_SERIAL_BFIN_DMA
	int			tx_done;
	int			tx_count;
	struct circ_buf		rx_dma_buf;
	struct timer_list       rx_dma_timer;
	int			rx_dma_nrows;
	unsigned int		tx_dma_channel;
	unsigned int		rx_dma_channel;
	struct work_struct	tx_dma_workqueue;
#else
	struct work_struct 	cts_workqueue;
#endif
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
	int		cts_pin;
	int 		rts_pin;
#endif
};

struct bfin_serial_port bfin_serial_ports[NR_PORTS];
struct bfin_serial_res {
	unsigned long	uart_base_addr;
	int		uart_irq;
#ifdef CONFIG_SERIAL_BFIN_DMA
	unsigned int	uart_tx_dma_channel;
	unsigned int	uart_rx_dma_channel;
#endif
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
	int	uart_cts_pin;
	int	uart_rts_pin;
#endif
};

struct bfin_serial_res bfin_serial_resource[] = {
#ifdef CONFIG_SERIAL_BFIN_UART0
	{
	0xFFC00400,
	IRQ_UART0_RX,
#ifdef CONFIG_SERIAL_BFIN_DMA
	CH_UART0_TX,
	CH_UART0_RX,
#endif
#ifdef CONFIG_BFIN_UART0_CTSRTS
	CONFIG_UART0_CTS_PIN,
	CONFIG_UART0_RTS_PIN,
#endif
	},
#endif
#ifdef CONFIG_SERIAL_BFIN_UART1
	{
	0xFFC02000,
	IRQ_UART1_RX,
#ifdef CONFIG_SERIAL_BFIN_DMA
	CH_UART1_TX,
	CH_UART1_RX,
#endif
	},
#endif
#ifdef CONFIG_SERIAL_BFIN_UART2
	{
	0xFFC02100,
	IRQ_UART2_RX,
#ifdef CONFIG_SERIAL_BFIN_DMA
	CH_UART2_TX,
	CH_UART2_RX,
#endif
#ifdef CONFIG_BFIN_UART2_CTSRTS
	CONFIG_UART2_CTS_PIN,
	CONFIG_UART2_RTS_PIN,
#endif
	},
#endif
#ifdef CONFIG_SERIAL_BFIN_UART3
	{
	0xFFC03100,
	IRQ_UART3_RX,
#ifdef CONFIG_SERIAL_BFIN_DMA
	CH_UART3_TX,
	CH_UART3_RX,
#endif
	},
#endif
};

int nr_ports = ARRAY_SIZE(bfin_serial_resource);

static void bfin_serial_hw_init(struct bfin_serial_port *uart)
{
#ifdef CONFIG_SERIAL_BFIN_UART0
	/* Enable UART0 RX and TX on pin 7 & 8 of PORT E */
	bfin_write_PORTE_FER(0x180 | bfin_read_PORTE_FER());
	bfin_write_PORTE_MUX(0x3C000 | bfin_read_PORTE_MUX());
#endif

#ifdef CONFIG_SERIAL_BFIN_UART1
	/* Enable UART1 RX and TX on pin 0 & 1 of PORT H */
	bfin_write_PORTH_FER(0x3 | bfin_read_PORTH_FER());
	bfin_write_PORTH_MUX(~0xF & bfin_read_PORTH_MUX());
#ifdef CONFIG_BFIN_UART1_CTSRTS
	/* Enable UART1 RTS and CTS on pin 9 & 10 of PORT E */
	bfin_write_PORTE_FER(0x600 | bfin_read_PORTE_FER());
	bfin_write_PORTE_MUX(~0x3C0000 & bfin_read_PORTE_MUX());
#endif
#endif

#ifdef CONFIG_SERIAL_BFIN_UART2
	/* Enable UART2 RX and TX on pin 4 & 5 of PORT B */
	bfin_write_PORTB_FER(0x30 | bfin_read_PORTB_FER());
	bfin_write_PORTB_MUX(~0xF00 & bfin_read_PORTB_MUX());
#endif

#ifdef CONFIG_SERIAL_BFIN_UART3
	/* Enable UART3 RX and TX on pin 6 & 7 of PORT B */
	bfin_write_PORTB_FER(0xC0 | bfin_read_PORTB_FER());
	bfin_write_PORTB_MUX(~0xF000 | bfin_read_PORTB_MUX());
#ifdef CONFIG_BFIN_UART3_CTSRTS
	/* Enable UART3 RTS and CTS on pin 2 & 3 of PORT B */
	bfin_write_PORTB_FER(0xC | bfin_read_PORTB_FER());
	bfin_write_PORTB_MUX(~0xF0 | bfin_read_PORTB_MUX());
#endif
#endif
	SSYNC();
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
	if (uart->cts_pin >= 0) {
		gpio_request(uart->cts_pin, NULL);
		gpio_direction_input(uart->cts_pin);
	}

	if (uart->rts_pin >= 0) {
		gpio_request(uart->rts_pin, NULL);
		gpio_direction_output(uart->rts_pin);
	}
#endif
}