1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
/*
* file: include/asm-blackfin/mach-bf561/bfin_serial_5xx.h
* based on:
* author:
*
* created:
* description:
* blackfin serial driver head file
* rev:
*
* modified:
*
*
* bugs: enter bugs at http://blackfin.uclinux.org/
*
* 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, or (at your option)
* any later version.
*
* this program is distributed in the hope that it will be useful,
* but without any warranty; without even the implied warranty of
* merchantability or fitness for a particular purpose. see the
* gnu general public license for more details.
*
* you should have received a copy of the gnu general public license
* along with this program; see the file copying.
* if not, write to the free software foundation,
* 59 temple place - suite 330, boston, ma 02111-1307, usa.
*/
#include <linux/serial.h>
#include <asm/dma.h>
#include <asm/portmux.h>
#define UART_GET_CHAR(uart) bfin_read16(((uart)->port.membase + OFFSET_RBR))
#define UART_GET_DLL(uart) bfin_read16(((uart)->port.membase + OFFSET_DLL))
#define UART_GET_IER(uart) bfin_read16(((uart)->port.membase + OFFSET_IER))
#define UART_GET_DLH(uart) bfin_read16(((uart)->port.membase + OFFSET_DLH))
#define UART_GET_IIR(uart) bfin_read16(((uart)->port.membase + OFFSET_IIR))
#define UART_GET_LCR(uart) bfin_read16(((uart)->port.membase + OFFSET_LCR))
#define UART_GET_GCTL(uart) bfin_read16(((uart)->port.membase + OFFSET_GCTL))
#define UART_PUT_CHAR(uart,v) bfin_write16(((uart)->port.membase + OFFSET_THR),v)
#define UART_PUT_DLL(uart,v) bfin_write16(((uart)->port.membase + OFFSET_DLL),v)
#define UART_PUT_IER(uart,v) bfin_write16(((uart)->port.membase + OFFSET_IER),v)
#define UART_SET_IER(uart,v) UART_PUT_IER(uart, UART_GET_IER(uart) | (v))
#define UART_CLEAR_IER(uart,v) UART_PUT_IER(uart, UART_GET_IER(uart) & ~(v))
#define UART_PUT_DLH(uart,v) bfin_write16(((uart)->port.membase + OFFSET_DLH),v)
#define UART_PUT_LCR(uart,v) bfin_write16(((uart)->port.membase + OFFSET_LCR),v)
#define UART_PUT_GCTL(uart,v) bfin_write16(((uart)->port.membase + OFFSET_GCTL),v)
#define UART_SET_DLAB(uart) do { UART_PUT_LCR(uart, UART_GET_LCR(uart) | DLAB); SSYNC(); } while (0)
#define UART_CLEAR_DLAB(uart) do { UART_PUT_LCR(uart, UART_GET_LCR(uart) & ~DLAB); SSYNC(); } while (0)
#define UART_GET_CTS(x) gpio_get_value(x->cts_pin)
#define UART_SET_RTS(x) gpio_set_value(x->rts_pin, 1)
#define UART_CLEAR_RTS(x) gpio_set_value(x->rts_pin, 0)
#define UART_ENABLE_INTS(x, v) UART_PUT_IER(x, v)
#define UART_DISABLE_INTS(x) UART_PUT_IER(x, 0)
#ifdef CONFIG_BFIN_UART0_CTSRTS
# define CONFIG_SERIAL_BFIN_CTSRTS
# ifndef CONFIG_UART0_CTS_PIN
# define CONFIG_UART0_CTS_PIN -1
# endif
# ifndef CONFIG_UART0_RTS_PIN
# define CONFIG_UART0_RTS_PIN -1
# endif
#endif
struct bfin_serial_port {
struct uart_port port;
unsigned int old_status;
unsigned int lsr;
#ifdef CONFIG_SERIAL_BFIN_DMA
int tx_done;
int tx_count;
struct circ_buf rx_dma_buf;
struct timer_list rx_dma_timer;
int rx_dma_nrows;
unsigned int tx_dma_channel;
unsigned int rx_dma_channel;
struct work_struct tx_dma_workqueue;
#else
# if ANOMALY_05000230
unsigned int anomaly_threshold;
# endif
#endif
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
struct timer_list cts_timer;
int cts_pin;
int rts_pin;
#endif
};
/* The hardware clears the LSR bits upon read, so we need to cache
* some of the more fun bits in software so they don't get lost
* when checking the LSR in other code paths (TX).
*/
static inline unsigned int UART_GET_LSR(struct bfin_serial_port *uart)
{
unsigned int lsr = bfin_read16(uart->port.membase + OFFSET_LSR);
uart->lsr |= (lsr & (BI|FE|PE|OE));
return lsr | uart->lsr;
}
static inline void UART_CLEAR_LSR(struct bfin_serial_port *uart)
{
uart->lsr = 0;
bfin_write16(uart->port.membase + OFFSET_LSR, -1);
}
struct bfin_serial_port bfin_serial_ports[BFIN_UART_NR_PORTS];
struct bfin_serial_res {
unsigned long uart_base_addr;
int uart_irq;
#ifdef CONFIG_SERIAL_BFIN_DMA
unsigned int uart_tx_dma_channel;
unsigned int uart_rx_dma_channel;
#endif
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
int uart_cts_pin;
int uart_rts_pin;
#endif
};
struct bfin_serial_res bfin_serial_resource[] = {
{
0xFFC00400,
IRQ_UART_RX,
#ifdef CONFIG_SERIAL_BFIN_DMA
CH_UART_TX,
CH_UART_RX,
#endif
#ifdef CONFIG_BFIN_UART0_CTSRTS
CONFIG_UART0_CTS_PIN,
CONFIG_UART0_RTS_PIN,
#endif
}
};
#define DRIVER_NAME "bfin-uart"
int nr_ports = BFIN_UART_NR_PORTS;
static void bfin_serial_hw_init(struct bfin_serial_port *uart)
{
#ifdef CONFIG_SERIAL_BFIN_UART0
peripheral_request(P_UART0_TX, DRIVER_NAME);
peripheral_request(P_UART0_RX, DRIVER_NAME);
#endif
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
if (uart->cts_pin >= 0) {
gpio_request(uart->cts_pin, DRIVER_NAME);
gpio_direction_input(uart->cts_pin);
}
if (uart->rts_pin >= 0) {
gpio_request(uart->rts_pin, DRIVER_NAME);
gpio_direction_input(uart->rts_pin, 0);
}
#endif
}
|
