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
|
/*
* arch/arm/mach-omap2/serial.c
*
* OMAP2 serial support.
*
* Copyright (C) 2005-2008 Nokia Corporation
* Author: Paul Mundt <paul.mundt@nokia.com>
*
* Based off of arch/arm/mach-omap/omap1/serial.c
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/serial_8250.h>
#include <linux/serial_reg.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <mach/common.h>
#include <mach/board.h>
static struct clk *uart_ick[OMAP_MAX_NR_PORTS];
static struct clk *uart_fck[OMAP_MAX_NR_PORTS];
static struct plat_serial8250_port serial_platform_data[] = {
{
.membase = IO_ADDRESS(OMAP_UART1_BASE),
.mapbase = OMAP_UART1_BASE,
.irq = 72,
.flags = UPF_BOOT_AUTOCONF,
.iotype = UPIO_MEM,
.regshift = 2,
.uartclk = OMAP24XX_BASE_BAUD * 16,
}, {
.membase = IO_ADDRESS(OMAP_UART2_BASE),
.mapbase = OMAP_UART2_BASE,
.irq = 73,
.flags = UPF_BOOT_AUTOCONF,
.iotype = UPIO_MEM,
.regshift = 2,
.uartclk = OMAP24XX_BASE_BAUD * 16,
}, {
.membase = IO_ADDRESS(OMAP_UART3_BASE),
.mapbase = OMAP_UART3_BASE,
.irq = 74,
.flags = UPF_BOOT_AUTOCONF,
.iotype = UPIO_MEM,
.regshift = 2,
.uartclk = OMAP24XX_BASE_BAUD * 16,
}, {
.flags = 0
}
};
static inline unsigned int serial_read_reg(struct plat_serial8250_port *up,
int offset)
{
offset <<= up->regshift;
return (unsigned int)__raw_readb(up->membase + offset);
}
static inline void serial_write_reg(struct plat_serial8250_port *p, int offset,
int value)
{
offset <<= p->regshift;
__raw_writeb(value, p->membase + offset);
}
/*
* Internal UARTs need to be initialized for the 8250 autoconfig to work
* properly. Note that the TX watermark initialization may not be needed
* once the 8250.c watermark handling code is merged.
*/
static inline void __init omap_serial_reset(struct plat_serial8250_port *p)
{
serial_write_reg(p, UART_OMAP_MDR1, 0x07);
serial_write_reg(p, UART_OMAP_SCR, 0x08);
serial_write_reg(p, UART_OMAP_MDR1, 0x00);
serial_write_reg(p, UART_OMAP_SYSC, (0x02 << 3) | (1 << 2) | (1 << 0));
}
void omap_serial_enable_clocks(int enable)
{
int i;
for (i = 0; i < OMAP_MAX_NR_PORTS; i++) {
if (uart_ick[i] && uart_fck[i]) {
if (enable) {
clk_enable(uart_ick[i]);
clk_enable(uart_fck[i]);
} else {
clk_disable(uart_ick[i]);
clk_disable(uart_fck[i]);
}
}
}
}
void __init omap_serial_init(void)
{
int i;
const struct omap_uart_config *info;
char name[16];
/*
* Make sure the serial ports are muxed on at this point.
* You have to mux them off in device drivers later on
* if not needed.
*/
info = omap_get_config(OMAP_TAG_UART, struct omap_uart_config);
if (info == NULL)
return;
for (i = 0; i < OMAP_MAX_NR_PORTS; i++) {
struct plat_serial8250_port *p = serial_platform_data + i;
if (!(info->enabled_uarts & (1 << i))) {
p->membase = NULL;
p->mapbase = 0;
continue;
}
sprintf(name, "uart%d_ick", i+1);
uart_ick[i] = clk_get(NULL, name);
if (IS_ERR(uart_ick[i])) {
printk(KERN_ERR "Could not get uart%d_ick\n", i+1);
uart_ick[i] = NULL;
} else
clk_enable(uart_ick[i]);
sprintf(name, "uart%d_fck", i+1);
uart_fck[i] = clk_get(NULL, name);
if (IS_ERR(uart_fck[i])) {
printk(KERN_ERR "Could not get uart%d_fck\n", i+1);
uart_fck[i] = NULL;
} else
clk_enable(uart_fck[i]);
omap_serial_reset(p);
}
}
static struct platform_device serial_device = {
.name = "serial8250",
.id = PLAT8250_DEV_PLATFORM,
.dev = {
.platform_data = serial_platform_data,
},
};
static int __init omap_init(void)
{
return platform_device_register(&serial_device);
}
arch_initcall(omap_init);
|
