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1/*
2 * linux/arch/arm/mach-omap1/serial.c
3 *
4 * OMAP1 serial support.
5 *
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.
9 */
10#include <linux/gpio.h>
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>
21#include <linux/io.h>
22
23#include <asm/mach-types.h>
24
25#include <mach/mux.h>
26
27#include "pm.h"
28
29static struct clk * uart1_ck;
30static struct clk * uart2_ck;
31static struct clk * uart3_ck;
32
33static inline unsigned int omap_serial_in(struct plat_serial8250_port *up,
34 int offset)
35{
36 offset <<= up->regshift;
37 return (unsigned int)__raw_readb(up->membase + offset);
38}
39
40static inline void omap_serial_outp(struct plat_serial8250_port *p, int offset,
41 int value)
42{
43 offset <<= p->regshift;
44 __raw_writeb(value, p->membase + offset);
45}
46
47/*
48 * Internal UARTs need to be initialized for the 8250 autoconfig to work
49 * properly. Note that the TX watermark initialization may not be needed
50 * once the 8250.c watermark handling code is merged.
51 */
52static void __init omap_serial_reset(struct plat_serial8250_port *p)
53{
54 omap_serial_outp(p, UART_OMAP_MDR1,
55 UART_OMAP_MDR1_DISABLE); /* disable UART */
56 omap_serial_outp(p, UART_OMAP_SCR, 0x08); /* TX watermark */
57 omap_serial_outp(p, UART_OMAP_MDR1,
58 UART_OMAP_MDR1_16X_MODE); /* enable UART */
59
60 if (!cpu_is_omap15xx()) {
61 omap_serial_outp(p, UART_OMAP_SYSC, 0x01);
62 while (!(omap_serial_in(p, UART_OMAP_SYSC) & 0x01));
63 }
64}
65
66static struct plat_serial8250_port serial_platform_data[] = {
67 {
68 .mapbase = OMAP1_UART1_BASE,
69 .irq = INT_UART1,
70 .flags = UPF_BOOT_AUTOCONF,
71 .iotype = UPIO_MEM,
72 .regshift = 2,
73 .uartclk = OMAP16XX_BASE_BAUD * 16,
74 },
75 {
76 .mapbase = OMAP1_UART2_BASE,
77 .irq = INT_UART2,
78 .flags = UPF_BOOT_AUTOCONF,
79 .iotype = UPIO_MEM,
80 .regshift = 2,
81 .uartclk = OMAP16XX_BASE_BAUD * 16,
82 },
83 {
84 .mapbase = OMAP1_UART3_BASE,
85 .irq = INT_UART3,
86 .flags = UPF_BOOT_AUTOCONF,
87 .iotype = UPIO_MEM,
88 .regshift = 2,
89 .uartclk = OMAP16XX_BASE_BAUD * 16,
90 },
91 { },
92};
93
94static struct platform_device serial_device = {
95 .name = "serial8250",
96 .id = PLAT8250_DEV_PLATFORM,
97 .dev = {
98 .platform_data = serial_platform_data,
99 },
100};
101
102/*
103 * Note that on Innovator-1510 UART2 pins conflict with USB2.
104 * By default UART2 does not work on Innovator-1510 if you have
105 * USB OHCI enabled. To use UART2, you must disable USB2 first.
106 */
107void __init omap_serial_init(void)
108{
109 int i;
110
111 if (cpu_is_omap7xx()) {
112 serial_platform_data[0].regshift = 0;
113 serial_platform_data[1].regshift = 0;
114 serial_platform_data[0].irq = INT_7XX_UART_MODEM_1;
115 serial_platform_data[1].irq = INT_7XX_UART_MODEM_IRDA_2;
116 }
117
118 if (cpu_is_omap15xx()) {
119 serial_platform_data[0].uartclk = OMAP1510_BASE_BAUD * 16;
120 serial_platform_data[1].uartclk = OMAP1510_BASE_BAUD * 16;
121 serial_platform_data[2].uartclk = OMAP1510_BASE_BAUD * 16;
122 }
123
124 for (i = 0; i < ARRAY_SIZE(serial_platform_data) - 1; i++) {
125
126 /* Don't look at UARTs higher than 2 for omap7xx */
127 if (cpu_is_omap7xx() && i > 1) {
128 serial_platform_data[i].membase = NULL;
129 serial_platform_data[i].mapbase = 0;
130 continue;
131 }
132
133 /* Static mapping, never released */
134 serial_platform_data[i].membase =
135 ioremap(serial_platform_data[i].mapbase, SZ_2K);
136 if (!serial_platform_data[i].membase) {
137 printk(KERN_ERR "Could not ioremap uart%i\n", i);
138 continue;
139 }
140 switch (i) {
141 case 0:
142 uart1_ck = clk_get(NULL, "uart1_ck");
143 if (IS_ERR(uart1_ck))
144 printk("Could not get uart1_ck\n");
145 else {
146 clk_enable(uart1_ck);
147 if (cpu_is_omap15xx())
148 clk_set_rate(uart1_ck, 12000000);
149 }
150 break;
151 case 1:
152 uart2_ck = clk_get(NULL, "uart2_ck");
153 if (IS_ERR(uart2_ck))
154 printk("Could not get uart2_ck\n");
155 else {
156 clk_enable(uart2_ck);
157 if (cpu_is_omap15xx())
158 clk_set_rate(uart2_ck, 12000000);
159 else
160 clk_set_rate(uart2_ck, 48000000);
161 }
162 break;
163 case 2:
164 uart3_ck = clk_get(NULL, "uart3_ck");
165 if (IS_ERR(uart3_ck))
166 printk("Could not get uart3_ck\n");
167 else {
168 clk_enable(uart3_ck);
169 if (cpu_is_omap15xx())
170 clk_set_rate(uart3_ck, 12000000);
171 }
172 break;
173 }
174 omap_serial_reset(&serial_platform_data[i]);
175 }
176}
177
178#ifdef CONFIG_OMAP_SERIAL_WAKE
179
180static irqreturn_t omap_serial_wake_interrupt(int irq, void *dev_id)
181{
182 /* Need to do something with serial port right after wake-up? */
183 return IRQ_HANDLED;
184}
185
186/*
187 * Reroutes serial RX lines to GPIO lines for the duration of
188 * sleep to allow waking up the device from serial port even
189 * in deep sleep.
190 */
191void omap_serial_wake_trigger(int enable)
192{
193 if (!cpu_is_omap16xx())
194 return;
195
196 if (uart1_ck != NULL) {
197 if (enable)
198 omap_cfg_reg(V14_16XX_GPIO37);
199 else
200 omap_cfg_reg(V14_16XX_UART1_RX);
201 }
202 if (uart2_ck != NULL) {
203 if (enable)
204 omap_cfg_reg(R9_16XX_GPIO18);
205 else
206 omap_cfg_reg(R9_16XX_UART2_RX);
207 }
208 if (uart3_ck != NULL) {
209 if (enable)
210 omap_cfg_reg(L14_16XX_GPIO49);
211 else
212 omap_cfg_reg(L14_16XX_UART3_RX);
213 }
214}
215
216static void __init omap_serial_set_port_wakeup(int gpio_nr)
217{
218 int ret;
219
220 ret = gpio_request(gpio_nr, "UART wake");
221 if (ret < 0) {
222 printk(KERN_ERR "Could not request UART wake GPIO: %i\n",
223 gpio_nr);
224 return;
225 }
226 gpio_direction_input(gpio_nr);
227 ret = request_irq(gpio_to_irq(gpio_nr), &omap_serial_wake_interrupt,
228 IRQF_TRIGGER_RISING, "serial wakeup", NULL);
229 if (ret) {
230 gpio_free(gpio_nr);
231 printk(KERN_ERR "No interrupt for UART wake GPIO: %i\n",
232 gpio_nr);
233 return;
234 }
235 enable_irq_wake(gpio_to_irq(gpio_nr));
236}
237
238int __init omap_serial_wakeup_init(void)
239{
240 if (!cpu_is_omap16xx())
241 return 0;
242
243 if (uart1_ck != NULL)
244 omap_serial_set_port_wakeup(37);
245 if (uart2_ck != NULL)
246 omap_serial_set_port_wakeup(18);
247 if (uart3_ck != NULL)
248 omap_serial_set_port_wakeup(49);
249
250 return 0;
251}
252
253#endif /* CONFIG_OMAP_SERIAL_WAKE */
254
255static int __init omap_init(void)
256{
257 if (!cpu_class_is_omap1())
258 return -ENODEV;
259
260 return platform_device_register(&serial_device);
261}
262arch_initcall(omap_init);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/arch/arm/mach-omap1/serial.c
4 *
5 * OMAP1 serial support.
6 */
7#include <linux/gpio/machine.h>
8#include <linux/gpio/consumer.h>
9#include <linux/module.h>
10#include <linux/kernel.h>
11#include <linux/init.h>
12#include <linux/irq.h>
13#include <linux/delay.h>
14#include <linux/serial.h>
15#include <linux/tty.h>
16#include <linux/serial_8250.h>
17#include <linux/serial_reg.h>
18#include <linux/clk.h>
19#include <linux/io.h>
20
21#include <asm/mach-types.h>
22
23#include "common.h"
24#include "serial.h"
25#include "mux.h"
26#include "pm.h"
27#include "soc.h"
28
29static struct clk * uart1_ck;
30static struct clk * uart2_ck;
31static struct clk * uart3_ck;
32
33static inline unsigned int omap_serial_in(struct plat_serial8250_port *up,
34 int offset)
35{
36 offset <<= up->regshift;
37 return (unsigned int)__raw_readb(up->membase + offset);
38}
39
40static inline void omap_serial_outp(struct plat_serial8250_port *p, int offset,
41 int value)
42{
43 offset <<= p->regshift;
44 __raw_writeb(value, p->membase + offset);
45}
46
47/*
48 * Internal UARTs need to be initialized for the 8250 autoconfig to work
49 * properly. Note that the TX watermark initialization may not be needed
50 * once the 8250.c watermark handling code is merged.
51 */
52static void __init omap_serial_reset(struct plat_serial8250_port *p)
53{
54 omap_serial_outp(p, UART_OMAP_MDR1,
55 UART_OMAP_MDR1_DISABLE); /* disable UART */
56 omap_serial_outp(p, UART_OMAP_SCR, 0x08); /* TX watermark */
57 omap_serial_outp(p, UART_OMAP_MDR1,
58 UART_OMAP_MDR1_16X_MODE); /* enable UART */
59
60 if (!cpu_is_omap15xx()) {
61 omap_serial_outp(p, UART_OMAP_SYSC, 0x01);
62 while (!(omap_serial_in(p, UART_OMAP_SYSC) & 0x01));
63 }
64}
65
66static struct plat_serial8250_port serial_platform_data[] = {
67 {
68 .mapbase = OMAP1_UART1_BASE,
69 .irq = INT_UART1,
70 .flags = UPF_BOOT_AUTOCONF,
71 .iotype = UPIO_MEM,
72 .regshift = 2,
73 .uartclk = OMAP16XX_BASE_BAUD * 16,
74 },
75 {
76 .mapbase = OMAP1_UART2_BASE,
77 .irq = INT_UART2,
78 .flags = UPF_BOOT_AUTOCONF,
79 .iotype = UPIO_MEM,
80 .regshift = 2,
81 .uartclk = OMAP16XX_BASE_BAUD * 16,
82 },
83 {
84 .mapbase = OMAP1_UART3_BASE,
85 .irq = INT_UART3,
86 .flags = UPF_BOOT_AUTOCONF,
87 .iotype = UPIO_MEM,
88 .regshift = 2,
89 .uartclk = OMAP16XX_BASE_BAUD * 16,
90 },
91 { },
92};
93
94static struct platform_device serial_device = {
95 .name = "serial8250",
96 .id = PLAT8250_DEV_PLATFORM,
97 .dev = {
98 .platform_data = serial_platform_data,
99 },
100};
101
102/*
103 * Note that on Innovator-1510 UART2 pins conflict with USB2.
104 * By default UART2 does not work on Innovator-1510 if you have
105 * USB OHCI enabled. To use UART2, you must disable USB2 first.
106 */
107void __init omap_serial_init(void)
108{
109 int i;
110
111 if (cpu_is_omap15xx()) {
112 serial_platform_data[0].uartclk = OMAP1510_BASE_BAUD * 16;
113 serial_platform_data[1].uartclk = OMAP1510_BASE_BAUD * 16;
114 serial_platform_data[2].uartclk = OMAP1510_BASE_BAUD * 16;
115 }
116
117 for (i = 0; i < ARRAY_SIZE(serial_platform_data) - 1; i++) {
118 /* Static mapping, never released */
119 serial_platform_data[i].membase =
120 ioremap(serial_platform_data[i].mapbase, SZ_2K);
121 if (!serial_platform_data[i].membase) {
122 printk(KERN_ERR "Could not ioremap uart%i\n", i);
123 continue;
124 }
125 switch (i) {
126 case 0:
127 uart1_ck = clk_get(NULL, "uart1_ck");
128 if (IS_ERR(uart1_ck))
129 printk("Could not get uart1_ck\n");
130 else {
131 clk_prepare_enable(uart1_ck);
132 if (cpu_is_omap15xx())
133 clk_set_rate(uart1_ck, 12000000);
134 }
135 break;
136 case 1:
137 uart2_ck = clk_get(NULL, "uart2_ck");
138 if (IS_ERR(uart2_ck))
139 printk("Could not get uart2_ck\n");
140 else {
141 clk_prepare_enable(uart2_ck);
142 if (cpu_is_omap15xx())
143 clk_set_rate(uart2_ck, 12000000);
144 else
145 clk_set_rate(uart2_ck, 48000000);
146 }
147 break;
148 case 2:
149 uart3_ck = clk_get(NULL, "uart3_ck");
150 if (IS_ERR(uart3_ck))
151 printk("Could not get uart3_ck\n");
152 else {
153 clk_prepare_enable(uart3_ck);
154 if (cpu_is_omap15xx())
155 clk_set_rate(uart3_ck, 12000000);
156 }
157 break;
158 }
159 omap_serial_reset(&serial_platform_data[i]);
160 }
161}
162
163#ifdef CONFIG_OMAP_SERIAL_WAKE
164
165static irqreturn_t omap_serial_wake_interrupt(int irq, void *dev_id)
166{
167 /* Need to do something with serial port right after wake-up? */
168 return IRQ_HANDLED;
169}
170
171/*
172 * Reroutes serial RX lines to GPIO lines for the duration of
173 * sleep to allow waking up the device from serial port even
174 * in deep sleep.
175 */
176void omap_serial_wake_trigger(int enable)
177{
178 if (!cpu_is_omap16xx())
179 return;
180
181 if (uart1_ck != NULL) {
182 if (enable)
183 omap_cfg_reg(V14_16XX_GPIO37);
184 else
185 omap_cfg_reg(V14_16XX_UART1_RX);
186 }
187 if (uart2_ck != NULL) {
188 if (enable)
189 omap_cfg_reg(R9_16XX_GPIO18);
190 else
191 omap_cfg_reg(R9_16XX_UART2_RX);
192 }
193 if (uart3_ck != NULL) {
194 if (enable)
195 omap_cfg_reg(L14_16XX_GPIO49);
196 else
197 omap_cfg_reg(L14_16XX_UART3_RX);
198 }
199}
200
201static void __init omap_serial_set_port_wakeup(int idx)
202{
203 struct gpio_desc *d;
204 int ret;
205
206 d = gpiod_get_index(NULL, "wakeup", idx, GPIOD_IN);
207 if (IS_ERR(d)) {
208 pr_err("Unable to get UART wakeup GPIO descriptor\n");
209 return;
210 }
211 ret = request_irq(gpiod_to_irq(d), &omap_serial_wake_interrupt,
212 IRQF_TRIGGER_RISING, "serial wakeup", NULL);
213 if (ret) {
214 gpiod_put(d);
215 pr_err("No interrupt for UART%d wake GPIO\n", idx + 1);
216 return;
217 }
218 enable_irq_wake(gpiod_to_irq(d));
219}
220
221
222int __init omap_serial_wakeup_init(void)
223{
224 if (!cpu_is_omap16xx())
225 return 0;
226
227 if (uart1_ck != NULL)
228 omap_serial_set_port_wakeup(0);
229 if (uart2_ck != NULL)
230 omap_serial_set_port_wakeup(1);
231 if (uart3_ck != NULL)
232 omap_serial_set_port_wakeup(2);
233
234 return 0;
235}
236
237#endif /* CONFIG_OMAP_SERIAL_WAKE */
238
239static int __init omap_init(void)
240{
241 if (!cpu_class_is_omap1())
242 return -ENODEV;
243
244 return platform_device_register(&serial_device);
245}
246arch_initcall(omap_init);