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Tony Lindgren1dbae812005-11-10 14:26:51 +00001/*
Uwe Zeisbergerf30c2262006-10-03 23:01:26 +02002 * arch/arm/mach-omap2/serial.c
Tony Lindgren1dbae812005-11-10 14:26:51 +00003 *
4 * OMAP2 serial support.
5 *
6 * Copyright (C) 2005 Nokia Corporation
7 * Author: Paul Mundt <paul.mundt@nokia.com>
8 *
9 * Based off of arch/arm/mach-omap/omap1/serial.c
10 *
11 * This file is subject to the terms and conditions of the GNU General Public
12 * License. See the file "COPYING" in the main directory of this archive
13 * for more details.
14 */
15#include <linux/kernel.h>
16#include <linux/init.h>
17#include <linux/serial_8250.h>
18#include <linux/serial_reg.h>
Russell Kingf8ce2542006-01-07 16:15:52 +000019#include <linux/clk.h>
Tony Lindgren1dbae812005-11-10 14:26:51 +000020
21#include <asm/io.h>
Tony Lindgren1dbae812005-11-10 14:26:51 +000022
Russell Kinga09e64f2008-08-05 16:14:15 +010023#include <mach/common.h>
24#include <mach/board.h>
Tony Lindgren1dbae812005-11-10 14:26:51 +000025
26static struct clk * uart1_ick = NULL;
27static struct clk * uart1_fck = NULL;
28static struct clk * uart2_ick = NULL;
29static struct clk * uart2_fck = NULL;
30static struct clk * uart3_ick = NULL;
31static struct clk * uart3_fck = NULL;
32
33static struct plat_serial8250_port serial_platform_data[] = {
34 {
35 .membase = (char *)IO_ADDRESS(OMAP_UART1_BASE),
36 .mapbase = (unsigned long)OMAP_UART1_BASE,
37 .irq = 72,
38 .flags = UPF_BOOT_AUTOCONF,
39 .iotype = UPIO_MEM,
40 .regshift = 2,
41 .uartclk = OMAP16XX_BASE_BAUD * 16,
42 }, {
43 .membase = (char *)IO_ADDRESS(OMAP_UART2_BASE),
44 .mapbase = (unsigned long)OMAP_UART2_BASE,
45 .irq = 73,
46 .flags = UPF_BOOT_AUTOCONF,
47 .iotype = UPIO_MEM,
48 .regshift = 2,
49 .uartclk = OMAP16XX_BASE_BAUD * 16,
50 }, {
51 .membase = (char *)IO_ADDRESS(OMAP_UART3_BASE),
52 .mapbase = (unsigned long)OMAP_UART3_BASE,
53 .irq = 74,
54 .flags = UPF_BOOT_AUTOCONF,
55 .iotype = UPIO_MEM,
56 .regshift = 2,
57 .uartclk = OMAP16XX_BASE_BAUD * 16,
58 }, {
59 .flags = 0
60 }
61};
62
63static inline unsigned int serial_read_reg(struct plat_serial8250_port *up,
64 int offset)
65{
66 offset <<= up->regshift;
67 return (unsigned int)__raw_readb(up->membase + offset);
68}
69
70static inline void serial_write_reg(struct plat_serial8250_port *p, int offset,
71 int value)
72{
73 offset <<= p->regshift;
74 __raw_writeb(value, (unsigned long)(p->membase + offset));
75}
76
77/*
78 * Internal UARTs need to be initialized for the 8250 autoconfig to work
79 * properly. Note that the TX watermark initialization may not be needed
80 * once the 8250.c watermark handling code is merged.
81 */
82static inline void __init omap_serial_reset(struct plat_serial8250_port *p)
83{
84 serial_write_reg(p, UART_OMAP_MDR1, 0x07);
85 serial_write_reg(p, UART_OMAP_SCR, 0x08);
86 serial_write_reg(p, UART_OMAP_MDR1, 0x00);
Juha Yrjola671c7232006-12-06 17:13:49 -080087 serial_write_reg(p, UART_OMAP_SYSC, (0x02 << 3) | (1 << 2) | (1 << 0));
Tony Lindgren1dbae812005-11-10 14:26:51 +000088}
89
90void __init omap_serial_init()
91{
92 int i;
93 const struct omap_uart_config *info;
94
95 /*
96 * Make sure the serial ports are muxed on at this point.
97 * You have to mux them off in device drivers later on
98 * if not needed.
99 */
100
101 info = omap_get_config(OMAP_TAG_UART,
102 struct omap_uart_config);
103
104 if (info == NULL)
105 return;
106
107 for (i = 0; i < OMAP_MAX_NR_PORTS; i++) {
108 struct plat_serial8250_port *p = serial_platform_data + i;
109
110 if (!(info->enabled_uarts & (1 << i))) {
111 p->membase = 0;
112 p->mapbase = 0;
113 continue;
114 }
115
116 switch (i) {
117 case 0:
118 uart1_ick = clk_get(NULL, "uart1_ick");
119 if (IS_ERR(uart1_ick))
120 printk("Could not get uart1_ick\n");
121 else {
Tony Lindgren30ff7202006-01-17 15:33:51 -0800122 clk_enable(uart1_ick);
Tony Lindgren1dbae812005-11-10 14:26:51 +0000123 }
124
125 uart1_fck = clk_get(NULL, "uart1_fck");
126 if (IS_ERR(uart1_fck))
127 printk("Could not get uart1_fck\n");
128 else {
Tony Lindgren30ff7202006-01-17 15:33:51 -0800129 clk_enable(uart1_fck);
Tony Lindgren1dbae812005-11-10 14:26:51 +0000130 }
131 break;
132 case 1:
133 uart2_ick = clk_get(NULL, "uart2_ick");
134 if (IS_ERR(uart2_ick))
135 printk("Could not get uart2_ick\n");
136 else {
Tony Lindgren30ff7202006-01-17 15:33:51 -0800137 clk_enable(uart2_ick);
Tony Lindgren1dbae812005-11-10 14:26:51 +0000138 }
139
140 uart2_fck = clk_get(NULL, "uart2_fck");
141 if (IS_ERR(uart2_fck))
142 printk("Could not get uart2_fck\n");
143 else {
Tony Lindgren30ff7202006-01-17 15:33:51 -0800144 clk_enable(uart2_fck);
Tony Lindgren1dbae812005-11-10 14:26:51 +0000145 }
146 break;
147 case 2:
148 uart3_ick = clk_get(NULL, "uart3_ick");
149 if (IS_ERR(uart3_ick))
150 printk("Could not get uart3_ick\n");
151 else {
Tony Lindgren30ff7202006-01-17 15:33:51 -0800152 clk_enable(uart3_ick);
Tony Lindgren1dbae812005-11-10 14:26:51 +0000153 }
154
155 uart3_fck = clk_get(NULL, "uart3_fck");
156 if (IS_ERR(uart3_fck))
157 printk("Could not get uart3_fck\n");
158 else {
Tony Lindgren30ff7202006-01-17 15:33:51 -0800159 clk_enable(uart3_fck);
Tony Lindgren1dbae812005-11-10 14:26:51 +0000160 }
161 break;
162 }
163
164 omap_serial_reset(p);
165 }
166}
167
168static struct platform_device serial_device = {
169 .name = "serial8250",
Lennert Buytenhek7d420892006-03-23 12:59:08 +0000170 .id = PLAT8250_DEV_PLATFORM,
Tony Lindgren1dbae812005-11-10 14:26:51 +0000171 .dev = {
172 .platform_data = serial_platform_data,
173 },
174};
175
176static int __init omap_init(void)
177{
178 return platform_device_register(&serial_device);
179}
180arch_initcall(omap_init);