2 * Driver for OMAP-UART controller.
3 * Based on drivers/serial/8250.c
5 * Copyright (C) 2010 Texas Instruments.
8 * Govindraj R <govindraj.raja@ti.com>
9 * Thara Gopinath <thara@ti.com>
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.
17 #ifndef __OMAP_SERIAL_H__
18 #define __OMAP_SERIAL_H__
20 #include <linux/serial_core.h>
21 #include <linux/platform_device.h>
25 #define DRIVER_NAME "omap_uart"
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.
32 #define OMAP_SERIAL_NAME "ttyO"
34 #define OMAP_MODE13X_SPEED 230400
36 #define OMAP_UART_SCR_TX_EMPTY 0x08
39 * Enable module level wakeup in WER reg
41 #define OMAP_UART_WER_MOD_WKUP 0X7F
43 /* Enable XON/XOFF flow control on output */
44 #define OMAP_UART_SW_TX 0x04
46 /* Enable XON/XOFF flow control on input */
47 #define OMAP_UART_SW_RX 0x04
49 #define OMAP_UART_SYSC_RESET 0X07
50 #define OMAP_UART_TCR_TRIG 0X0F
51 #define OMAP_UART_SW_CLR 0XF0
52 #define OMAP_UART_FIFO_CLR 0X06
54 #define OMAP_UART_DMA_CH_FREE -1
56 #define RX_TIMEOUT (3 * HZ)
57 #define OMAP_MAX_HSUART_PORTS 4
59 #define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
61 #define UART_ERRATA_i202_MDR1_ACCESS BIT(0)
62 #define UART_ERRATA_i291_DMA_FORCEIDLE BIT(1)
64 struct omap_uart_port_info {
65 bool dma_enabled; /* To specify DMA Mode */
66 unsigned int uartclk; /* UART clock rate */
67 upf_t flags; /* UPF_* flags */
69 unsigned int dma_rx_buf_size;
70 unsigned int dma_rx_timeout;
71 unsigned int autosuspend_timeout;
73 int (*get_context_loss_count)(struct device *);
74 void (*set_forceidle)(struct platform_device *);
75 void (*set_noidle)(struct platform_device *);
76 void (*enable_wakeup)(struct platform_device *, bool);
79 struct uart_omap_dma {
84 dma_addr_t rx_buf_dma_phys;
85 dma_addr_t tx_buf_dma_phys;
86 unsigned int uart_base;
88 * Buffer for rx dma.It is not required for tx because the buffer
89 * comes from port structure.
91 unsigned char *rx_buf;
92 unsigned int prev_rx_dma_pos;
98 /* timer to poll activity on rx dma */
99 struct timer_list rx_timer;
100 unsigned int rx_buf_size;
101 unsigned int rx_timeout;
104 struct uart_omap_port {
105 struct uart_port port;
106 struct uart_omap_dma uart_dma;
107 struct platform_device *pdev;
121 * Some bits in registers are cleared on a read, so they must
122 * be saved whenever the register is read but the bits will not
123 * be immediately processed.
125 unsigned int lsr_break_flag;
126 unsigned char msr_saved_flags;
128 unsigned long port_activity;
129 u32 context_loss_cnt;
134 #endif /* __OMAP_SERIAL_H__ */