omap-serial.h

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/*
 * Driver for OMAP-UART controller.
 * Based on drivers/serial/8250.c
 *
 * Copyright (C) 2010 Texas Instruments.
 *
 * Authors:
 *  Govindraj R <[email protected]>
 *  Thara Gopinath  <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#ifndef __OMAP_SERIAL_H__
#define __OMAP_SERIAL_H__

#include <linux/serial_core.h>
#include <linux/device.h>
#include <linux/pm_qos.h>

#define DRIVER_NAME "omap_uart"

/*
 * Use tty device name as ttyO, [O -> OMAP]
 * in bootargs we specify as console=ttyO0 if uart1
 * is used as console uart.
 */
#define OMAP_SERIAL_NAME    "ttyO"

#define OMAP_MODE13X_SPEED  230400

#define OMAP_UART_SCR_TX_EMPTY  0x08

/* WER = 0x7F
 * Enable module level wakeup in WER reg
 */
#define OMAP_UART_WER_MOD_WKUP  0X7F

/* Enable XON/XOFF flow control on output */
#define OMAP_UART_SW_TX     0x04

/* Enable XON/XOFF flow control on input */
#define OMAP_UART_SW_RX     0x04

#define OMAP_UART_SYSC_RESET    0X07
#define OMAP_UART_TCR_TRIG  0X0F
#define OMAP_UART_SW_CLR    0XF0
#define OMAP_UART_FIFO_CLR  0X06

#define OMAP_UART_DMA_CH_FREE   -1

#define OMAP_MAX_HSUART_PORTS   6

#define MSR_SAVE_FLAGS      UART_MSR_ANY_DELTA

#define UART_ERRATA_i202_MDR1_ACCESS    BIT(0)
#define UART_ERRATA_i291_DMA_FORCEIDLE  BIT(1)

struct omap_uart_port_info {
    bool            dma_enabled;    /* To specify DMA Mode */
    unsigned int        uartclk;    /* UART clock rate */
    upf_t           flags;      /* UPF_* flags */
    unsigned int        dma_rx_buf_size;
    unsigned int        dma_rx_timeout;
    unsigned int        autosuspend_timeout;
    unsigned int        dma_rx_poll_rate;
    int         DTR_gpio;
    int         DTR_inverted;
    int         DTR_present;

    int (*get_context_loss_count)(struct device *);
    void (*set_forceidle)(struct device *);
    void (*set_noidle)(struct device *);
    void (*enable_wakeup)(struct device *, bool);
};

struct uart_omap_dma {
    u8          uart_dma_tx;
    u8          uart_dma_rx;
    int         rx_dma_channel;
    int         tx_dma_channel;
    dma_addr_t      rx_buf_dma_phys;
    dma_addr_t      tx_buf_dma_phys;
    unsigned int        uart_base;
    /*
     * Buffer for rx dma.It is not required for tx because the buffer
     * comes from port structure.
     */
    unsigned char       *rx_buf;
    unsigned int        prev_rx_dma_pos;
    int         tx_buf_size;
    int         tx_dma_used;
    int         rx_dma_used;
    spinlock_t      tx_lock;
    spinlock_t      rx_lock;
    /* timer to poll activity on rx dma */
    struct timer_list   rx_timer;
    unsigned int        rx_buf_size;
    unsigned int        rx_poll_rate;
    unsigned int        rx_timeout;
};

#endif /* __OMAP_SERIAL_H__ */