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Commit | Line | Data |
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f577ffd7 | 1 | /* |
f30c2269 | 2 | * linux/arch/arm/mach-omap1/serial.c |
f577ffd7 | 3 | * |
65d873ca | 4 | * OMAP1 serial support. |
f577ffd7 TL |
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 | */ | |
2f8163ba | 10 | #include <linux/gpio.h> |
f577ffd7 TL |
11 | #include <linux/module.h> |
12 | #include <linux/kernel.h> | |
13 | #include <linux/init.h> | |
d533c128 | 14 | #include <linux/irq.h> |
f577ffd7 TL |
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> | |
f8ce2547 | 20 | #include <linux/clk.h> |
fced80c7 | 21 | #include <linux/io.h> |
f577ffd7 | 22 | |
f577ffd7 | 23 | #include <asm/mach-types.h> |
f577ffd7 | 24 | |
70c494c3 | 25 | #include <mach/mux.h> |
f577ffd7 | 26 | |
706afdda AK |
27 | #include "pm.h" |
28 | ||
120db2cb TL |
29 | static struct clk * uart1_ck; |
30 | static struct clk * uart2_ck; | |
31 | static struct clk * uart3_ck; | |
f577ffd7 TL |
32 | |
33 | static 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 | ||
40 | static 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 | */ | |
52 | static void __init omap_serial_reset(struct plat_serial8250_port *p) | |
53 | { | |
498cb951 AE |
54 | omap_serial_outp(p, UART_OMAP_MDR1, |
55 | UART_OMAP_MDR1_DISABLE); /* disable UART */ | |
f577ffd7 | 56 | omap_serial_outp(p, UART_OMAP_SCR, 0x08); /* TX watermark */ |
498cb951 AE |
57 | omap_serial_outp(p, UART_OMAP_MDR1, |
58 | UART_OMAP_MDR1_16X_MODE); /* enable UART */ | |
f577ffd7 | 59 | |
65d873ca | 60 | if (!cpu_is_omap15xx()) { |
f577ffd7 TL |
61 | omap_serial_outp(p, UART_OMAP_SYSC, 0x01); |
62 | while (!(omap_serial_in(p, UART_OMAP_SYSC) & 0x01)); | |
63 | } | |
64 | } | |
65 | ||
66 | static struct plat_serial8250_port serial_platform_data[] = { | |
67 | { | |
4f2c49fe | 68 | .mapbase = OMAP1_UART1_BASE, |
f577ffd7 TL |
69 | .irq = INT_UART1, |
70 | .flags = UPF_BOOT_AUTOCONF, | |
71 | .iotype = UPIO_MEM, | |
72 | .regshift = 2, | |
73 | .uartclk = OMAP16XX_BASE_BAUD * 16, | |
74 | }, | |
75 | { | |
4f2c49fe | 76 | .mapbase = OMAP1_UART2_BASE, |
f577ffd7 TL |
77 | .irq = INT_UART2, |
78 | .flags = UPF_BOOT_AUTOCONF, | |
79 | .iotype = UPIO_MEM, | |
80 | .regshift = 2, | |
81 | .uartclk = OMAP16XX_BASE_BAUD * 16, | |
82 | }, | |
83 | { | |
4f2c49fe | 84 | .mapbase = OMAP1_UART3_BASE, |
f577ffd7 TL |
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 | ||
94 | static struct platform_device serial_device = { | |
95 | .name = "serial8250", | |
6df29deb | 96 | .id = PLAT8250_DEV_PLATFORM, |
f577ffd7 TL |
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 | */ | |
3179a019 | 107 | void __init omap_serial_init(void) |
f577ffd7 TL |
108 | { |
109 | int i; | |
110 | ||
d8723ae2 | 111 | if (cpu_is_omap7xx()) { |
f577ffd7 TL |
112 | serial_platform_data[0].regshift = 0; |
113 | serial_platform_data[1].regshift = 0; | |
372b1c32 AB |
114 | serial_platform_data[0].irq = INT_7XX_UART_MODEM_1; |
115 | serial_platform_data[1].irq = INT_7XX_UART_MODEM_IRDA_2; | |
56739a69 ZM |
116 | } |
117 | ||
65d873ca | 118 | if (cpu_is_omap15xx()) { |
f577ffd7 TL |
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 | ||
9d30b99f | 124 | for (i = 0; i < ARRAY_SIZE(serial_platform_data) - 1; i++) { |
f577ffd7 | 125 | |
8b8fbd39 CM |
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 | ||
84f90c9c TL |
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 | } | |
f577ffd7 TL |
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 { | |
30ff720b | 146 | clk_enable(uart1_ck); |
65d873ca | 147 | if (cpu_is_omap15xx()) |
f577ffd7 TL |
148 | clk_set_rate(uart1_ck, 12000000); |
149 | } | |
f577ffd7 TL |
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 { | |
30ff720b | 156 | clk_enable(uart2_ck); |
65d873ca | 157 | if (cpu_is_omap15xx()) |
f577ffd7 TL |
158 | clk_set_rate(uart2_ck, 12000000); |
159 | else | |
160 | clk_set_rate(uart2_ck, 48000000); | |
161 | } | |
f577ffd7 TL |
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 { | |
30ff720b | 168 | clk_enable(uart3_ck); |
65d873ca | 169 | if (cpu_is_omap15xx()) |
f577ffd7 TL |
170 | clk_set_rate(uart3_ck, 12000000); |
171 | } | |
f577ffd7 TL |
172 | break; |
173 | } | |
174 | omap_serial_reset(&serial_platform_data[i]); | |
175 | } | |
176 | } | |
177 | ||
7c38cf02 TL |
178 | #ifdef CONFIG_OMAP_SERIAL_WAKE |
179 | ||
0cd61b68 | 180 | static irqreturn_t omap_serial_wake_interrupt(int irq, void *dev_id) |
7c38cf02 TL |
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 | */ | |
191 | void 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 | ||
216 | static void __init omap_serial_set_port_wakeup(int gpio_nr) | |
217 | { | |
218 | int ret; | |
219 | ||
f2d18fea | 220 | ret = gpio_request(gpio_nr, "UART wake"); |
7c38cf02 TL |
221 | if (ret < 0) { |
222 | printk(KERN_ERR "Could not request UART wake GPIO: %i\n", | |
223 | gpio_nr); | |
224 | return; | |
225 | } | |
40e3925b | 226 | gpio_direction_input(gpio_nr); |
15f74b03 | 227 | ret = request_irq(gpio_to_irq(gpio_nr), &omap_serial_wake_interrupt, |
52e405ea | 228 | IRQF_TRIGGER_RISING, "serial wakeup", NULL); |
7c38cf02 | 229 | if (ret) { |
f2d18fea | 230 | gpio_free(gpio_nr); |
7c38cf02 TL |
231 | printk(KERN_ERR "No interrupt for UART wake GPIO: %i\n", |
232 | gpio_nr); | |
233 | return; | |
234 | } | |
15f74b03 | 235 | enable_irq_wake(gpio_to_irq(gpio_nr)); |
7c38cf02 TL |
236 | } |
237 | ||
82c3bd03 | 238 | int __init omap_serial_wakeup_init(void) |
7c38cf02 TL |
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 | } | |
7c38cf02 TL |
252 | |
253 | #endif /* CONFIG_OMAP_SERIAL_WAKE */ | |
254 | ||
f577ffd7 TL |
255 | static int __init omap_init(void) |
256 | { | |
7f9187c2 TL |
257 | if (!cpu_class_is_omap1()) |
258 | return -ENODEV; | |
259 | ||
f577ffd7 TL |
260 | return platform_device_register(&serial_device); |
261 | } | |
262 | arch_initcall(omap_init); |