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-hsuart"
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_MDR1_DISABLE 0x07
35 #define OMAP_MDR1_MODE13X 0x03
36 #define OMAP_MDR1_MODE16X 0x00
37 #define OMAP_MODE13X_SPEED 230400
40 * LCR = 0XBF: Switch to Configuration Mode B.
41 * In configuration mode b allow access
43 * Reference OMAP TRM Chapter 17
44 * Section: 1.4.3 Mode Selection
46 #define OMAP_UART_LCR_CONF_MDB 0XBF
49 * Enable module level wakeup in WER reg
51 #define OMAP_UART_WER_MOD_WKUP 0X7F
53 /* Enable XON/XOFF flow control on output */
54 #define OMAP_UART_SW_TX 0x04
56 /* Enable XON/XOFF flow control on input */
57 #define OMAP_UART_SW_RX 0x04
59 #define OMAP_UART_SYSC_RESET 0X07
60 #define OMAP_UART_TCR_TRIG 0X0F
61 #define OMAP_UART_SW_CLR 0XF0
62 #define OMAP_UART_FIFO_CLR 0X06
64 #define OMAP_UART_DMA_CH_FREE -1
66 #define RX_TIMEOUT (3 * HZ)
67 #define OMAP_MAX_HSUART_PORTS 4
69 #define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
71 struct omap_uart_port_info {
72 bool dma_enabled; /* To specify DMA Mode */
73 unsigned int uartclk; /* UART clock rate */
74 void __iomem *membase; /* ioremap cookie or NULL */
75 resource_size_t mapbase; /* resource base */
76 unsigned long irqflags; /* request_irq flags */
77 upf_t flags; /* UPF_* flags */
80 struct uart_omap_dma {
85 dma_addr_t rx_buf_dma_phys;
86 dma_addr_t tx_buf_dma_phys;
87 unsigned int uart_base;
89 * Buffer for rx dma.It is not required for tx because the buffer
90 * comes from port structure.
92 unsigned char *rx_buf;
93 unsigned int prev_rx_dma_pos;
99 /* timer to poll activity on rx dma */
100 struct timer_list rx_timer;
105 struct uart_omap_port {
106 struct uart_port port;
107 struct uart_omap_dma uart_dma;
108 struct platform_device *pdev;
118 * Some bits in registers are cleared on a read, so they must
119 * be saved whenever the register is read but the bits will not
120 * be immediately processed.
122 unsigned int lsr_break_flag;
123 unsigned char msr_saved_flags;
125 unsigned long port_activity;
128 #endif /* __OMAP_SERIAL_H__ */