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b612633b G |
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 | ||
b612633b G |
23 | #include <plat/mux.h> |
24 | ||
374b8cfd | 25 | #define DRIVER_NAME "omap_uart" |
b612633b G |
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 | ||
b612633b G |
34 | #define OMAP_MODE13X_SPEED 230400 |
35 | ||
b612633b G |
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__ */ |