2 * linux/arch/arm/mach-omap1/serial.c
4 * OMAP1 serial support.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/irq.h>
15 #include <linux/delay.h>
16 #include <linux/serial.h>
17 #include <linux/tty.h>
18 #include <linux/serial_8250.h>
19 #include <linux/serial_reg.h>
20 #include <linux/clk.h>
23 #include <asm/mach-types.h>
25 #include <plat/board.h>
27 #include <mach/gpio.h>
28 #include <plat/fpga.h>
32 static struct clk * uart1_ck;
33 static struct clk * uart2_ck;
34 static struct clk * uart3_ck;
36 static inline unsigned int omap_serial_in(struct plat_serial8250_port *up,
39 offset <<= up->regshift;
40 return (unsigned int)__raw_readb(up->membase + offset);
43 static inline void omap_serial_outp(struct plat_serial8250_port *p, int offset,
46 offset <<= p->regshift;
47 __raw_writeb(value, p->membase + offset);
51 * Internal UARTs need to be initialized for the 8250 autoconfig to work
52 * properly. Note that the TX watermark initialization may not be needed
53 * once the 8250.c watermark handling code is merged.
55 static void __init omap_serial_reset(struct plat_serial8250_port *p)
57 omap_serial_outp(p, UART_OMAP_MDR1,
58 UART_OMAP_MDR1_DISABLE); /* disable UART */
59 omap_serial_outp(p, UART_OMAP_SCR, 0x08); /* TX watermark */
60 omap_serial_outp(p, UART_OMAP_MDR1,
61 UART_OMAP_MDR1_16X_MODE); /* enable UART */
63 if (!cpu_is_omap15xx()) {
64 omap_serial_outp(p, UART_OMAP_SYSC, 0x01);
65 while (!(omap_serial_in(p, UART_OMAP_SYSC) & 0x01));
69 static struct plat_serial8250_port serial_platform_data[] = {
71 .mapbase = OMAP1_UART1_BASE,
73 .flags = UPF_BOOT_AUTOCONF,
76 .uartclk = OMAP16XX_BASE_BAUD * 16,
79 .mapbase = OMAP1_UART2_BASE,
81 .flags = UPF_BOOT_AUTOCONF,
84 .uartclk = OMAP16XX_BASE_BAUD * 16,
87 .mapbase = OMAP1_UART3_BASE,
89 .flags = UPF_BOOT_AUTOCONF,
92 .uartclk = OMAP16XX_BASE_BAUD * 16,
97 static struct platform_device serial_device = {
99 .id = PLAT8250_DEV_PLATFORM,
101 .platform_data = serial_platform_data,
106 * Note that on Innovator-1510 UART2 pins conflict with USB2.
107 * By default UART2 does not work on Innovator-1510 if you have
108 * USB OHCI enabled. To use UART2, you must disable USB2 first.
110 void __init omap_serial_init(void)
114 if (cpu_is_omap7xx()) {
115 serial_platform_data[0].regshift = 0;
116 serial_platform_data[1].regshift = 0;
117 serial_platform_data[0].irq = INT_7XX_UART_MODEM_1;
118 serial_platform_data[1].irq = INT_7XX_UART_MODEM_IRDA_2;
121 if (cpu_is_omap15xx()) {
122 serial_platform_data[0].uartclk = OMAP1510_BASE_BAUD * 16;
123 serial_platform_data[1].uartclk = OMAP1510_BASE_BAUD * 16;
124 serial_platform_data[2].uartclk = OMAP1510_BASE_BAUD * 16;
127 for (i = 0; i < ARRAY_SIZE(serial_platform_data) - 1; i++) {
129 /* Don't look at UARTs higher than 2 for omap7xx */
130 if (cpu_is_omap7xx() && i > 1) {
131 serial_platform_data[i].membase = NULL;
132 serial_platform_data[i].mapbase = 0;
136 /* Static mapping, never released */
137 serial_platform_data[i].membase =
138 ioremap(serial_platform_data[i].mapbase, SZ_2K);
139 if (!serial_platform_data[i].membase) {
140 printk(KERN_ERR "Could not ioremap uart%i\n", i);
145 uart1_ck = clk_get(NULL, "uart1_ck");
146 if (IS_ERR(uart1_ck))
147 printk("Could not get uart1_ck\n");
149 clk_enable(uart1_ck);
150 if (cpu_is_omap15xx())
151 clk_set_rate(uart1_ck, 12000000);
155 uart2_ck = clk_get(NULL, "uart2_ck");
156 if (IS_ERR(uart2_ck))
157 printk("Could not get uart2_ck\n");
159 clk_enable(uart2_ck);
160 if (cpu_is_omap15xx())
161 clk_set_rate(uart2_ck, 12000000);
163 clk_set_rate(uart2_ck, 48000000);
167 uart3_ck = clk_get(NULL, "uart3_ck");
168 if (IS_ERR(uart3_ck))
169 printk("Could not get uart3_ck\n");
171 clk_enable(uart3_ck);
172 if (cpu_is_omap15xx())
173 clk_set_rate(uart3_ck, 12000000);
177 omap_serial_reset(&serial_platform_data[i]);
181 #ifdef CONFIG_OMAP_SERIAL_WAKE
183 static irqreturn_t omap_serial_wake_interrupt(int irq, void *dev_id)
185 /* Need to do something with serial port right after wake-up? */
190 * Reroutes serial RX lines to GPIO lines for the duration of
191 * sleep to allow waking up the device from serial port even
194 void omap_serial_wake_trigger(int enable)
196 if (!cpu_is_omap16xx())
199 if (uart1_ck != NULL) {
201 omap_cfg_reg(V14_16XX_GPIO37);
203 omap_cfg_reg(V14_16XX_UART1_RX);
205 if (uart2_ck != NULL) {
207 omap_cfg_reg(R9_16XX_GPIO18);
209 omap_cfg_reg(R9_16XX_UART2_RX);
211 if (uart3_ck != NULL) {
213 omap_cfg_reg(L14_16XX_GPIO49);
215 omap_cfg_reg(L14_16XX_UART3_RX);
219 static void __init omap_serial_set_port_wakeup(int gpio_nr)
223 ret = gpio_request(gpio_nr, "UART wake");
225 printk(KERN_ERR "Could not request UART wake GPIO: %i\n",
229 gpio_direction_input(gpio_nr);
230 ret = request_irq(gpio_to_irq(gpio_nr), &omap_serial_wake_interrupt,
231 IRQF_TRIGGER_RISING, "serial wakeup", NULL);
234 printk(KERN_ERR "No interrupt for UART wake GPIO: %i\n",
238 enable_irq_wake(gpio_to_irq(gpio_nr));
241 static int __init omap_serial_wakeup_init(void)
243 if (!cpu_is_omap16xx())
246 if (uart1_ck != NULL)
247 omap_serial_set_port_wakeup(37);
248 if (uart2_ck != NULL)
249 omap_serial_set_port_wakeup(18);
250 if (uart3_ck != NULL)
251 omap_serial_set_port_wakeup(49);
255 late_initcall(omap_serial_wakeup_init);
257 #endif /* CONFIG_OMAP_SERIAL_WAKE */
259 static int __init omap_init(void)
261 if (!cpu_class_is_omap1())
264 return platform_device_register(&serial_device);
266 arch_initcall(omap_init);