129 lines
3.0 KiB
C
129 lines
3.0 KiB
C
|
/*
|
||
|
|
* Driver for OMAP-UART controller.
|
||
|
|
* Based on drivers/serial/8250.c
|
||
|
|
*
|
||
|
|
* Copyright (C) 2010 Texas Instruments.
|
||
|
|
*
|
||
|
|
* Authors:
|
||
|
|
* Govindraj R <govindraj.raja@ti.com>
|
||
|
|
* Thara Gopinath <thara@ti.com>
|
||
|
|
*
|
||
|
|
* 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/platform_device.h>
|
||
|
|
|
||
|
|
#include <plat/mux.h>
|
||
|
|
|
||
|
|
#define DRIVER_NAME "omap-hsuart"
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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_MDR1_DISABLE 0x07
|
||
|
|
#define OMAP_MDR1_MODE13X 0x03
|
||
|
|
#define OMAP_MDR1_MODE16X 0x00
|
||
|
|
#define OMAP_MODE13X_SPEED 230400
|
||
|
|
|
||
|
|
/*
|
||
|
|
* LCR = 0XBF: Switch to Configuration Mode B.
|
||
|
|
* In configuration mode b allow access
|
||
|
|
* to EFR,DLL,DLH.
|
||
|
|
* Reference OMAP TRM Chapter 17
|
||
|
|
* Section: 1.4.3 Mode Selection
|
||
|
|
*/
|
||
|
|
#define OMAP_UART_LCR_CONF_MDB 0XBF
|
||
|
|
|
||
|
|
/* 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 RX_TIMEOUT (3 * HZ)
|
||
|
|
#define OMAP_MAX_HSUART_PORTS 4
|
||
|
|
|
||
|
|
#define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
|
||
|
|
|
||
|
|
struct omap_uart_port_info {
|
||
|
|
bool dma_enabled; /* To specify DMA Mode */
|
||
|
|
unsigned int uartclk; /* UART clock rate */
|
||
|
|
void __iomem *membase; /* ioremap cookie or NULL */
|
||
|
|
resource_size_t mapbase; /* resource base */
|
||
|
|
unsigned long irqflags; /* request_irq flags */
|
||
|
|
upf_t flags; /* UPF_* flags */
|
||
|
|
};
|
||
|
|
|
||
|
|
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;
|
||
|
|
int rx_buf_size;
|
||
|
|
int rx_timeout;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct uart_omap_port {
|
||
|
|
struct uart_port port;
|
||
|
|
struct uart_omap_dma uart_dma;
|
||
|
|
struct platform_device *pdev;
|
||
|
|
|
||
|
|
unsigned char ier;
|
||
|
|
unsigned char lcr;
|
||
|
|
unsigned char mcr;
|
||
|
|
unsigned char fcr;
|
||
|
|
unsigned char efr;
|
||
|
|
|
||
|
|
int use_dma;
|
||
|
|
/*
|
||
|
|
* Some bits in registers are cleared on a read, so they must
|
||
|
|
* be saved whenever the register is read but the bits will not
|
||
|
|
* be immediately processed.
|
||
|
|
*/
|
||
|
|
unsigned int lsr_break_flag;
|
||
|
|
unsigned char msr_saved_flags;
|
||
|
|
char name[20];
|
||
|
|
unsigned long port_activity;
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif /* __OMAP_SERIAL_H__ */
|