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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);
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
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 <plat/board.h>
26#include <plat/mux.h>
27#include <mach/gpio.h>
28#include <plat/fpga.h>
29
30#include "pm.h"
31
32static struct clk * uart1_ck;
33static struct clk * uart2_ck;
34static struct clk * uart3_ck;
35
36static inline unsigned int omap_serial_in(struct plat_serial8250_port *up,
37 int offset)
38{
39 offset <<= up->regshift;
40 return (unsigned int)__raw_readb(up->membase + offset);
41}
42
43static inline void omap_serial_outp(struct plat_serial8250_port *p, int offset,
44 int value)
45{
46 offset <<= p->regshift;
47 __raw_writeb(value, p->membase + offset);
48}
49
50/*
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.
54 */
55static void __init omap_serial_reset(struct plat_serial8250_port *p)
56{
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 */
62
63 if (!cpu_is_omap15xx()) {
64 omap_serial_outp(p, UART_OMAP_SYSC, 0x01);
65 while (!(omap_serial_in(p, UART_OMAP_SYSC) & 0x01));
66 }
67}
68
69static struct plat_serial8250_port serial_platform_data[] = {
70 {
71 .mapbase = OMAP1_UART1_BASE,
72 .irq = INT_UART1,
73 .flags = UPF_BOOT_AUTOCONF,
74 .iotype = UPIO_MEM,
75 .regshift = 2,
76 .uartclk = OMAP16XX_BASE_BAUD * 16,
77 },
78 {
79 .mapbase = OMAP1_UART2_BASE,
80 .irq = INT_UART2,
81 .flags = UPF_BOOT_AUTOCONF,
82 .iotype = UPIO_MEM,
83 .regshift = 2,
84 .uartclk = OMAP16XX_BASE_BAUD * 16,
85 },
86 {
87 .mapbase = OMAP1_UART3_BASE,
88 .irq = INT_UART3,
89 .flags = UPF_BOOT_AUTOCONF,
90 .iotype = UPIO_MEM,
91 .regshift = 2,
92 .uartclk = OMAP16XX_BASE_BAUD * 16,
93 },
94 { },
95};
96
97static struct platform_device serial_device = {
98 .name = "serial8250",
99 .id = PLAT8250_DEV_PLATFORM,
100 .dev = {
101 .platform_data = serial_platform_data,
102 },
103};
104
105/*
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.
109 */
110void __init omap_serial_init(void)
111{
112 int i;
113
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;
119 }
120
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;
125 }
126
127 for (i = 0; i < ARRAY_SIZE(serial_platform_data) - 1; i++) {
128
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;
133 continue;
134 }
135
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);
141 continue;
142 }
143 switch (i) {
144 case 0:
145 uart1_ck = clk_get(NULL, "uart1_ck");
146 if (IS_ERR(uart1_ck))
147 printk("Could not get uart1_ck\n");
148 else {
149 clk_enable(uart1_ck);
150 if (cpu_is_omap15xx())
151 clk_set_rate(uart1_ck, 12000000);
152 }
153 break;
154 case 1:
155 uart2_ck = clk_get(NULL, "uart2_ck");
156 if (IS_ERR(uart2_ck))
157 printk("Could not get uart2_ck\n");
158 else {
159 clk_enable(uart2_ck);
160 if (cpu_is_omap15xx())
161 clk_set_rate(uart2_ck, 12000000);
162 else
163 clk_set_rate(uart2_ck, 48000000);
164 }
165 break;
166 case 2:
167 uart3_ck = clk_get(NULL, "uart3_ck");
168 if (IS_ERR(uart3_ck))
169 printk("Could not get uart3_ck\n");
170 else {
171 clk_enable(uart3_ck);
172 if (cpu_is_omap15xx())
173 clk_set_rate(uart3_ck, 12000000);
174 }
175 break;
176 }
177 omap_serial_reset(&serial_platform_data[i]);
178 }
179}
180
181#ifdef CONFIG_OMAP_SERIAL_WAKE
182
183static irqreturn_t omap_serial_wake_interrupt(int irq, void *dev_id)
184{
185 /* Need to do something with serial port right after wake-up? */
186 return IRQ_HANDLED;
187}
188
189/*
190 * Reroutes serial RX lines to GPIO lines for the duration of
191 * sleep to allow waking up the device from serial port even
192 * in deep sleep.
193 */
194void omap_serial_wake_trigger(int enable)
195{
196 if (!cpu_is_omap16xx())
197 return;
198
199 if (uart1_ck != NULL) {
200 if (enable)
201 omap_cfg_reg(V14_16XX_GPIO37);
202 else
203 omap_cfg_reg(V14_16XX_UART1_RX);
204 }
205 if (uart2_ck != NULL) {
206 if (enable)
207 omap_cfg_reg(R9_16XX_GPIO18);
208 else
209 omap_cfg_reg(R9_16XX_UART2_RX);
210 }
211 if (uart3_ck != NULL) {
212 if (enable)
213 omap_cfg_reg(L14_16XX_GPIO49);
214 else
215 omap_cfg_reg(L14_16XX_UART3_RX);
216 }
217}
218
219static void __init omap_serial_set_port_wakeup(int gpio_nr)
220{
221 int ret;
222
223 ret = gpio_request(gpio_nr, "UART wake");
224 if (ret < 0) {
225 printk(KERN_ERR "Could not request UART wake GPIO: %i\n",
226 gpio_nr);
227 return;
228 }
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);
232 if (ret) {
233 gpio_free(gpio_nr);
234 printk(KERN_ERR "No interrupt for UART wake GPIO: %i\n",
235 gpio_nr);
236 return;
237 }
238 enable_irq_wake(gpio_to_irq(gpio_nr));
239}
240
241static int __init omap_serial_wakeup_init(void)
242{
243 if (!cpu_is_omap16xx())
244 return 0;
245
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);
252
253 return 0;
254}
255late_initcall(omap_serial_wakeup_init);
256
257#endif /* CONFIG_OMAP_SERIAL_WAKE */
258
259static int __init omap_init(void)
260{
261 if (!cpu_class_is_omap1())
262 return -ENODEV;
263
264 return platform_device_register(&serial_device);
265}
266arch_initcall(omap_init);