1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/arch/arm/mach-omap1/serial.c
5 * OMAP1 serial support.
7 #include <linux/gpio.h>
8 #include <linux/module.h>
9 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <linux/irq.h>
12 #include <linux/delay.h>
13 #include <linux/serial.h>
14 #include <linux/tty.h>
15 #include <linux/serial_8250.h>
16 #include <linux/serial_reg.h>
17 #include <linux/clk.h>
20 #include <asm/mach-types.h>
27 static struct clk * uart1_ck;
28 static struct clk * uart2_ck;
29 static struct clk * uart3_ck;
31 static inline unsigned int omap_serial_in(struct plat_serial8250_port *up,
34 offset <<= up->regshift;
35 return (unsigned int)__raw_readb(up->membase + offset);
38 static inline void omap_serial_outp(struct plat_serial8250_port *p, int offset,
41 offset <<= p->regshift;
42 __raw_writeb(value, p->membase + offset);
46 * Internal UARTs need to be initialized for the 8250 autoconfig to work
47 * properly. Note that the TX watermark initialization may not be needed
48 * once the 8250.c watermark handling code is merged.
50 static void __init omap_serial_reset(struct plat_serial8250_port *p)
52 omap_serial_outp(p, UART_OMAP_MDR1,
53 UART_OMAP_MDR1_DISABLE); /* disable UART */
54 omap_serial_outp(p, UART_OMAP_SCR, 0x08); /* TX watermark */
55 omap_serial_outp(p, UART_OMAP_MDR1,
56 UART_OMAP_MDR1_16X_MODE); /* enable UART */
58 if (!cpu_is_omap15xx()) {
59 omap_serial_outp(p, UART_OMAP_SYSC, 0x01);
60 while (!(omap_serial_in(p, UART_OMAP_SYSC) & 0x01));
64 static struct plat_serial8250_port serial_platform_data[] = {
66 .mapbase = OMAP1_UART1_BASE,
68 .flags = UPF_BOOT_AUTOCONF,
71 .uartclk = OMAP16XX_BASE_BAUD * 16,
74 .mapbase = OMAP1_UART2_BASE,
76 .flags = UPF_BOOT_AUTOCONF,
79 .uartclk = OMAP16XX_BASE_BAUD * 16,
82 .mapbase = OMAP1_UART3_BASE,
84 .flags = UPF_BOOT_AUTOCONF,
87 .uartclk = OMAP16XX_BASE_BAUD * 16,
92 static struct platform_device serial_device = {
94 .id = PLAT8250_DEV_PLATFORM,
96 .platform_data = serial_platform_data,
101 * Note that on Innovator-1510 UART2 pins conflict with USB2.
102 * By default UART2 does not work on Innovator-1510 if you have
103 * USB OHCI enabled. To use UART2, you must disable USB2 first.
105 void __init omap_serial_init(void)
109 if (cpu_is_omap7xx()) {
110 serial_platform_data[0].regshift = 0;
111 serial_platform_data[1].regshift = 0;
112 serial_platform_data[0].irq = INT_7XX_UART_MODEM_1;
113 serial_platform_data[1].irq = INT_7XX_UART_MODEM_IRDA_2;
116 if (cpu_is_omap15xx()) {
117 serial_platform_data[0].uartclk = OMAP1510_BASE_BAUD * 16;
118 serial_platform_data[1].uartclk = OMAP1510_BASE_BAUD * 16;
119 serial_platform_data[2].uartclk = OMAP1510_BASE_BAUD * 16;
122 for (i = 0; i < ARRAY_SIZE(serial_platform_data) - 1; i++) {
124 /* Don't look at UARTs higher than 2 for omap7xx */
125 if (cpu_is_omap7xx() && i > 1) {
126 serial_platform_data[i].membase = NULL;
127 serial_platform_data[i].mapbase = 0;
131 /* Static mapping, never released */
132 serial_platform_data[i].membase =
133 ioremap(serial_platform_data[i].mapbase, SZ_2K);
134 if (!serial_platform_data[i].membase) {
135 printk(KERN_ERR "Could not ioremap uart%i\n", i);
140 uart1_ck = clk_get(NULL, "uart1_ck");
141 if (IS_ERR(uart1_ck))
142 printk("Could not get uart1_ck\n");
144 clk_enable(uart1_ck);
145 if (cpu_is_omap15xx())
146 clk_set_rate(uart1_ck, 12000000);
150 uart2_ck = clk_get(NULL, "uart2_ck");
151 if (IS_ERR(uart2_ck))
152 printk("Could not get uart2_ck\n");
154 clk_enable(uart2_ck);
155 if (cpu_is_omap15xx())
156 clk_set_rate(uart2_ck, 12000000);
158 clk_set_rate(uart2_ck, 48000000);
162 uart3_ck = clk_get(NULL, "uart3_ck");
163 if (IS_ERR(uart3_ck))
164 printk("Could not get uart3_ck\n");
166 clk_enable(uart3_ck);
167 if (cpu_is_omap15xx())
168 clk_set_rate(uart3_ck, 12000000);
172 omap_serial_reset(&serial_platform_data[i]);
176 #ifdef CONFIG_OMAP_SERIAL_WAKE
178 static irqreturn_t omap_serial_wake_interrupt(int irq, void *dev_id)
180 /* Need to do something with serial port right after wake-up? */
185 * Reroutes serial RX lines to GPIO lines for the duration of
186 * sleep to allow waking up the device from serial port even
189 void omap_serial_wake_trigger(int enable)
191 if (!cpu_is_omap16xx())
194 if (uart1_ck != NULL) {
196 omap_cfg_reg(V14_16XX_GPIO37);
198 omap_cfg_reg(V14_16XX_UART1_RX);
200 if (uart2_ck != NULL) {
202 omap_cfg_reg(R9_16XX_GPIO18);
204 omap_cfg_reg(R9_16XX_UART2_RX);
206 if (uart3_ck != NULL) {
208 omap_cfg_reg(L14_16XX_GPIO49);
210 omap_cfg_reg(L14_16XX_UART3_RX);
214 static void __init omap_serial_set_port_wakeup(int gpio_nr)
218 ret = gpio_request(gpio_nr, "UART wake");
220 printk(KERN_ERR "Could not request UART wake GPIO: %i\n",
224 gpio_direction_input(gpio_nr);
225 ret = request_irq(gpio_to_irq(gpio_nr), &omap_serial_wake_interrupt,
226 IRQF_TRIGGER_RISING, "serial wakeup", NULL);
229 printk(KERN_ERR "No interrupt for UART wake GPIO: %i\n",
233 enable_irq_wake(gpio_to_irq(gpio_nr));
236 int __init omap_serial_wakeup_init(void)
238 if (!cpu_is_omap16xx())
241 if (uart1_ck != NULL)
242 omap_serial_set_port_wakeup(37);
243 if (uart2_ck != NULL)
244 omap_serial_set_port_wakeup(18);
245 if (uart3_ck != NULL)
246 omap_serial_set_port_wakeup(49);
251 #endif /* CONFIG_OMAP_SERIAL_WAKE */
253 static int __init omap_init(void)
255 if (!cpu_class_is_omap1())
258 return platform_device_register(&serial_device);
260 arch_initcall(omap_init);