arch/arm/plat-omap/include/plat/omap-serial.h

   1 /*
   2  * Driver for OMAP-UART controller.
   3  * Based on drivers/serial/8250.c
   4  *
   5  * Copyright (C) 2010 Texas Instruments.
   6  *
   7  * Authors:
   8  *      Govindraj R     <govindraj.raja@ti.com>
   9  *      Thara Gopinath  <thara@ti.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  */
  16
  17 #ifndef __OMAP_SERIAL_H__
  18 #define __OMAP_SERIAL_H__
  19
  20 #include <linux/serial_core.h>
  21 #include <linux/platform_device.h>
  22
  23 #include <plat/mux.h>
  24
  25 #define DRIVER_NAME     "omap_uart"
  26
  27 /*
  28  * Use tty device name as ttyO, [O -> OMAP]
  29  * in bootargs we specify as console=ttyO0 if uart1
  30  * is used as console uart.
  31  */
  32 #define OMAP_SERIAL_NAME        "ttyO"
  33
  34 #define OMAP_MODE13X_SPEED      230400
  35
  36 /* WER = 0x7F
  37  * Enable module level wakeup in WER reg
  38  */
  39 #define OMAP_UART_WER_MOD_WKUP  0X7F
  40
  41 /* Enable XON/XOFF flow control on output */
  42 #define OMAP_UART_SW_TX         0x04
  43
  44 /* Enable XON/XOFF flow control on input */
  45 #define OMAP_UART_SW_RX         0x04
  46
  47 #define OMAP_UART_SYSC_RESET    0X07
  48 #define OMAP_UART_TCR_TRIG      0X0F
  49 #define OMAP_UART_SW_CLR        0XF0
  50 #define OMAP_UART_FIFO_CLR      0X06
  51
  52 #define OMAP_UART_DMA_CH_FREE   -1
  53
  54 #define RX_TIMEOUT              (3 * HZ)
  55 #define OMAP_MAX_HSUART_PORTS   4
  56
  57 #define MSR_SAVE_FLAGS          UART_MSR_ANY_DELTA
  58
  59 struct omap_uart_port_info {
  60         bool                    dma_enabled;    /* To specify DMA Mode */
  61         unsigned int            uartclk;        /* UART clock rate */
  62         void __iomem            *membase;       /* ioremap cookie or NULL */
  63         resource_size_t         mapbase;        /* resource base */
  64         unsigned long           irqflags;       /* request_irq flags */
  65         upf_t                   flags;          /* UPF_* flags */
  66 };
  67
  68 struct uart_omap_dma {
  69         u8                      uart_dma_tx;
  70         u8                      uart_dma_rx;
  71         int                     rx_dma_channel;
  72         int                     tx_dma_channel;
  73         dma_addr_t              rx_buf_dma_phys;
  74         dma_addr_t              tx_buf_dma_phys;
  75         unsigned int            uart_base;
  76         /*
  77          * Buffer for rx dma.It is not required for tx because the buffer
  78          * comes from port structure.
  79          */
  80         unsigned char           *rx_buf;
  81         unsigned int            prev_rx_dma_pos;
  82         int                     tx_buf_size;
  83         int                     tx_dma_used;
  84         int                     rx_dma_used;
  85         spinlock_t              tx_lock;
  86         spinlock_t              rx_lock;
  87         /* timer to poll activity on rx dma */
  88         struct timer_list       rx_timer;
  89         int                     rx_buf_size;
  90         int                     rx_timeout;
  91 };
  92
  93 struct uart_omap_port {
  94         struct uart_port        port;
  95         struct uart_omap_dma    uart_dma;
  96         struct platform_device  *pdev;
  97
  98         unsigned char           ier;
  99         unsigned char           lcr;
 100         unsigned char           mcr;
 101         unsigned char           fcr;
 102         unsigned char           efr;
 103
 104         int                     use_dma;
 105         /*
 106          * Some bits in registers are cleared on a read, so they must
 107          * be saved whenever the register is read but the bits will not
 108          * be immediately processed.
 109          */
 110         unsigned int            lsr_break_flag;
 111         unsigned char           msr_saved_flags;
 112         char                    name[20];
 113         unsigned long           port_activity;
 114 };
 115
 116 #endif /* __OMAP_SERIAL_H__ */