forked from Minki/linux
a4f743851f
This reverts commit 957ee7270d
(serial: omap: fix software flow control).
As Russell has pointed out, that commit isn't fixing
Software Flow Control at all, and it actually makes
it even more broken.
It was agreed to revert this commit and use Russell's
latest UART patches instead.
Cc: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
107 lines
2.6 KiB
C
107 lines
2.6 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/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__ */
|