2 * arch/arm/mach-omap2/serial.c
4 * OMAP2 serial support.
6 * Copyright (C) 2005-2008 Nokia Corporation
7 * Author: Paul Mundt <paul.mundt@nokia.com>
9 * Based off of arch/arm/mach-omap/omap1/serial.c
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
15 #include <linux/kernel.h>
16 #include <linux/init.h>
17 #include <linux/serial_8250.h>
18 #include <linux/serial_reg.h>
19 #include <linux/clk.h>
23 #include <mach/common.h>
24 #include <mach/board.h>
26 static struct clk *uart_ick[OMAP_MAX_NR_PORTS];
27 static struct clk *uart_fck[OMAP_MAX_NR_PORTS];
29 static struct plat_serial8250_port serial_platform_data[] = {
31 .membase = (__force void __iomem *)IO_ADDRESS(OMAP_UART1_BASE),
32 .mapbase = (unsigned long)OMAP_UART1_BASE,
34 .flags = UPF_BOOT_AUTOCONF,
37 .uartclk = OMAP24XX_BASE_BAUD * 16,
39 .membase = (__force void __iomem *)IO_ADDRESS(OMAP_UART2_BASE),
40 .mapbase = (unsigned long)OMAP_UART2_BASE,
42 .flags = UPF_BOOT_AUTOCONF,
45 .uartclk = OMAP24XX_BASE_BAUD * 16,
47 .membase = (__force void __iomem *)IO_ADDRESS(OMAP_UART3_BASE),
48 .mapbase = (unsigned long)OMAP_UART3_BASE,
50 .flags = UPF_BOOT_AUTOCONF,
53 .uartclk = OMAP24XX_BASE_BAUD * 16,
59 static inline unsigned int serial_read_reg(struct plat_serial8250_port *up,
62 offset <<= up->regshift;
63 return (unsigned int)__raw_readb(up->membase + offset);
66 static inline void serial_write_reg(struct plat_serial8250_port *p, int offset,
69 offset <<= p->regshift;
70 __raw_writeb(value, p->membase + offset);
74 * Internal UARTs need to be initialized for the 8250 autoconfig to work
75 * properly. Note that the TX watermark initialization may not be needed
76 * once the 8250.c watermark handling code is merged.
78 static inline void __init omap_serial_reset(struct plat_serial8250_port *p)
80 serial_write_reg(p, UART_OMAP_MDR1, 0x07);
81 serial_write_reg(p, UART_OMAP_SCR, 0x08);
82 serial_write_reg(p, UART_OMAP_MDR1, 0x00);
83 serial_write_reg(p, UART_OMAP_SYSC, (0x02 << 3) | (1 << 2) | (1 << 0));
86 void omap_serial_enable_clocks(int enable)
89 for (i = 0; i < OMAP_MAX_NR_PORTS; i++) {
90 if (uart_ick[i] && uart_fck[i]) {
92 clk_enable(uart_ick[i]);
93 clk_enable(uart_fck[i]);
95 clk_disable(uart_ick[i]);
96 clk_disable(uart_fck[i]);
102 void __init omap_serial_init(void)
105 const struct omap_uart_config *info;
109 * Make sure the serial ports are muxed on at this point.
110 * You have to mux them off in device drivers later on
114 info = omap_get_config(OMAP_TAG_UART, struct omap_uart_config);
119 for (i = 0; i < OMAP_MAX_NR_PORTS; i++) {
120 struct plat_serial8250_port *p = serial_platform_data + i;
122 if (!(info->enabled_uarts & (1 << i))) {
128 sprintf(name, "uart%d_ick", i+1);
129 uart_ick[i] = clk_get(NULL, name);
130 if (IS_ERR(uart_ick[i])) {
131 printk(KERN_ERR "Could not get uart%d_ick\n", i+1);
134 clk_enable(uart_ick[i]);
136 sprintf(name, "uart%d_fck", i+1);
137 uart_fck[i] = clk_get(NULL, name);
138 if (IS_ERR(uart_fck[i])) {
139 printk(KERN_ERR "Could not get uart%d_fck\n", i+1);
142 clk_enable(uart_fck[i]);
144 omap_serial_reset(p);
148 static struct platform_device serial_device = {
149 .name = "serial8250",
150 .id = PLAT8250_DEV_PLATFORM,
152 .platform_data = serial_platform_data,
156 static int __init omap_init(void)
158 return platform_device_register(&serial_device);
160 arch_initcall(omap_init);