aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-omap2/serial.c
blob: f4df04fe1dd83ed06023db513f0db1f422bef7fe (plain)
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
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
/*
 * arch/arm/mach-omap/omap2/serial.c
 *
 * OMAP2 serial support.
 *
 * Copyright (C) 2005 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 <asm/io.h>
#include <asm/hardware/clock.h>

#include <asm/arch/common.h>
#include <asm/arch/board.h>

static struct clk * uart1_ick = NULL;
static struct clk * uart1_fck = NULL;
static struct clk * uart2_ick = NULL;
static struct clk * uart2_fck = NULL;
static struct clk * uart3_ick = NULL;
static struct clk * uart3_fck = NULL;

static struct plat_serial8250_port serial_platform_data[] = {
	{
		.membase	= (char *)IO_ADDRESS(OMAP_UART1_BASE),
		.mapbase	= (unsigned long)OMAP_UART1_BASE,
		.irq		= 72,
		.flags		= UPF_BOOT_AUTOCONF,
		.iotype		= UPIO_MEM,
		.regshift	= 2,
		.uartclk	= OMAP16XX_BASE_BAUD * 16,
	}, {
		.membase	= (char *)IO_ADDRESS(OMAP_UART2_BASE),
		.mapbase	= (unsigned long)OMAP_UART2_BASE,
		.irq		= 73,
		.flags		= UPF_BOOT_AUTOCONF,
		.iotype		= UPIO_MEM,
		.regshift	= 2,
		.uartclk	= OMAP16XX_BASE_BAUD * 16,
	}, {
		.membase	= (char *)IO_ADDRESS(OMAP_UART3_BASE),
		.mapbase	= (unsigned long)OMAP_UART3_BASE,
		.irq		= 74,
		.flags		= UPF_BOOT_AUTOCONF,
		.iotype		= UPIO_MEM,
		.regshift	= 2,
		.uartclk	= OMAP16XX_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, (unsigned long)(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, 0x01);
}

void __init omap_serial_init()
{
	int i;
	const struct omap_uart_config *info;

	/*
	 * 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 = 0;
			p->mapbase = 0;
			continue;
		}

		switch (i) {
		case 0:
			uart1_ick = clk_get(NULL, "uart1_ick");
			if (IS_ERR(uart1_ick))
				printk("Could not get uart1_ick\n");
			else {
				clk_use(uart1_ick);
			}

			uart1_fck = clk_get(NULL, "uart1_fck");
			if (IS_ERR(uart1_fck))
				printk("Could not get uart1_fck\n");
			else {
				clk_use(uart1_fck);
			}
			break;
		case 1:
			uart2_ick = clk_get(NULL, "uart2_ick");
			if (IS_ERR(uart2_ick))
				printk("Could not get uart2_ick\n");
			else {
				clk_use(uart2_ick);
			}

			uart2_fck = clk_get(NULL, "uart2_fck");
			if (IS_ERR(uart2_fck))
				printk("Could not get uart2_fck\n");
			else {
				clk_use(uart2_fck);
			}
			break;
		case 2:
			uart3_ick = clk_get(NULL, "uart3_ick");
			if (IS_ERR(uart3_ick))
				printk("Could not get uart3_ick\n");
			else {
				clk_use(uart3_ick);
			}

			uart3_fck = clk_get(NULL, "uart3_fck");
			if (IS_ERR(uart3_fck))
				printk("Could not get uart3_fck\n");
			else {
				clk_use(uart3_fck);
			}
			break;
		}

		omap_serial_reset(p);
	}
}

static struct platform_device serial_device = {
	.name			= "serial8250",
	.id			= 0,
	.dev			= {
		.platform_data	= serial_platform_data,
	},
};

static int __init omap_init(void)
{
	return platform_device_register(&serial_device);
}
arch_initcall(omap_init);