Commit | Line | Data |
---|---|---|
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 | |
ce491cf8 TL |
25 | #include <plat/board.h> |
26 | #include <plat/mux.h> | |
ce491cf8 | 27 | #include <plat/fpga.h> |
f577ffd7 | 28 | |
706afdda AK |
29 | #include "pm.h" |
30 | ||
120db2cb TL |
31 | static struct clk * uart1_ck; |
32 | static struct clk * uart2_ck; | |
33 | static struct clk * uart3_ck; | |
f577ffd7 TL |
34 | |
35 | static inline unsigned int omap_serial_in(struct plat_serial8250_port *up, | |
36 | int offset) | |
37 | { | |
38 | offset <<= up->regshift; | |
39 | return (unsigned int)__raw_readb(up->membase + offset); | |
40 | } | |
41 | ||
42 | static inline void omap_serial_outp(struct plat_serial8250_port *p, int offset, | |
43 | int value) | |
44 | { | |
45 | offset <<= p->regshift; | |
46 | __raw_writeb(value, p->membase + offset); | |
47 | } | |
48 | ||
49 | /* | |
50 | * Internal UARTs need to be initialized for the 8250 autoconfig to work | |
51 | * properly. Note that the TX watermark initialization may not be needed | |
52 | * once the 8250.c watermark handling code is merged. | |
53 | */ | |
54 | static void __init omap_serial_reset(struct plat_serial8250_port *p) | |
55 | { | |
498cb951 AE |
56 | omap_serial_outp(p, UART_OMAP_MDR1, |
57 | UART_OMAP_MDR1_DISABLE); /* disable UART */ | |
f577ffd7 | 58 | omap_serial_outp(p, UART_OMAP_SCR, 0x08); /* TX watermark */ |
498cb951 AE |
59 | omap_serial_outp(p, UART_OMAP_MDR1, |
60 | UART_OMAP_MDR1_16X_MODE); /* enable UART */ | |
f577ffd7 | 61 | |
65d873ca | 62 | if (!cpu_is_omap15xx()) { |
f577ffd7 TL |
63 | omap_serial_outp(p, UART_OMAP_SYSC, 0x01); |
64 | while (!(omap_serial_in(p, UART_OMAP_SYSC) & 0x01)); | |
65 | } | |
66 | } | |
67 | ||
68 | static struct plat_serial8250_port serial_platform_data[] = { | |
69 | { | |
4f2c49fe | 70 | .mapbase = OMAP1_UART1_BASE, |
f577ffd7 TL |
71 | .irq = INT_UART1, |
72 | .flags = UPF_BOOT_AUTOCONF, | |
73 | .iotype = UPIO_MEM, | |
74 | .regshift = 2, | |
75 | .uartclk = OMAP16XX_BASE_BAUD * 16, | |
76 | }, | |
77 | { | |
4f2c49fe | 78 | .mapbase = OMAP1_UART2_BASE, |
f577ffd7 TL |
79 | .irq = INT_UART2, |
80 | .flags = UPF_BOOT_AUTOCONF, | |
81 | .iotype = UPIO_MEM, | |
82 | .regshift = 2, | |
83 | .uartclk = OMAP16XX_BASE_BAUD * 16, | |
84 | }, | |
85 | { | |
4f2c49fe | 86 | .mapbase = OMAP1_UART3_BASE, |
f577ffd7 TL |
87 | .irq = INT_UART3, |
88 | .flags = UPF_BOOT_AUTOCONF, | |
89 | .iotype = UPIO_MEM, | |
90 | .regshift = 2, | |
91 | .uartclk = OMAP16XX_BASE_BAUD * 16, | |
92 | }, | |
93 | { }, | |
94 | }; | |
95 | ||
96 | static struct platform_device serial_device = { | |
97 | .name = "serial8250", | |
6df29deb | 98 | .id = PLAT8250_DEV_PLATFORM, |
f577ffd7 TL |
99 | .dev = { |
100 | .platform_data = serial_platform_data, | |
101 | }, | |
102 | }; | |
103 | ||
104 | /* | |
105 | * Note that on Innovator-1510 UART2 pins conflict with USB2. | |
106 | * By default UART2 does not work on Innovator-1510 if you have | |
107 | * USB OHCI enabled. To use UART2, you must disable USB2 first. | |
108 | */ | |
3179a019 | 109 | void __init omap_serial_init(void) |
f577ffd7 TL |
110 | { |
111 | int i; | |
112 | ||
d8723ae2 | 113 | if (cpu_is_omap7xx()) { |
f577ffd7 TL |
114 | serial_platform_data[0].regshift = 0; |
115 | serial_platform_data[1].regshift = 0; | |
372b1c32 AB |
116 | serial_platform_data[0].irq = INT_7XX_UART_MODEM_1; |
117 | serial_platform_data[1].irq = INT_7XX_UART_MODEM_IRDA_2; | |
56739a69 ZM |
118 | } |
119 | ||
65d873ca | 120 | if (cpu_is_omap15xx()) { |
f577ffd7 TL |
121 | serial_platform_data[0].uartclk = OMAP1510_BASE_BAUD * 16; |
122 | serial_platform_data[1].uartclk = OMAP1510_BASE_BAUD * 16; | |
123 | serial_platform_data[2].uartclk = OMAP1510_BASE_BAUD * 16; | |
124 | } | |
125 | ||
9d30b99f | 126 | for (i = 0; i < ARRAY_SIZE(serial_platform_data) - 1; i++) { |
f577ffd7 | 127 | |
8b8fbd39 CM |
128 | /* Don't look at UARTs higher than 2 for omap7xx */ |
129 | if (cpu_is_omap7xx() && i > 1) { | |
130 | serial_platform_data[i].membase = NULL; | |
131 | serial_platform_data[i].mapbase = 0; | |
132 | continue; | |
133 | } | |
134 | ||
84f90c9c TL |
135 | /* Static mapping, never released */ |
136 | serial_platform_data[i].membase = | |
137 | ioremap(serial_platform_data[i].mapbase, SZ_2K); | |
138 | if (!serial_platform_data[i].membase) { | |
139 | printk(KERN_ERR "Could not ioremap uart%i\n", i); | |
140 | continue; | |
141 | } | |
f577ffd7 TL |
142 | switch (i) { |
143 | case 0: | |
144 | uart1_ck = clk_get(NULL, "uart1_ck"); | |
145 | if (IS_ERR(uart1_ck)) | |
146 | printk("Could not get uart1_ck\n"); | |
147 | else { | |
30ff720b | 148 | clk_enable(uart1_ck); |
65d873ca | 149 | if (cpu_is_omap15xx()) |
f577ffd7 TL |
150 | clk_set_rate(uart1_ck, 12000000); |
151 | } | |
f577ffd7 TL |
152 | break; |
153 | case 1: | |
154 | uart2_ck = clk_get(NULL, "uart2_ck"); | |
155 | if (IS_ERR(uart2_ck)) | |
156 | printk("Could not get uart2_ck\n"); | |
157 | else { | |
30ff720b | 158 | clk_enable(uart2_ck); |
65d873ca | 159 | if (cpu_is_omap15xx()) |
f577ffd7 TL |
160 | clk_set_rate(uart2_ck, 12000000); |
161 | else | |
162 | clk_set_rate(uart2_ck, 48000000); | |
163 | } | |
f577ffd7 TL |
164 | break; |
165 | case 2: | |
166 | uart3_ck = clk_get(NULL, "uart3_ck"); | |
167 | if (IS_ERR(uart3_ck)) | |
168 | printk("Could not get uart3_ck\n"); | |
169 | else { | |
30ff720b | 170 | clk_enable(uart3_ck); |
65d873ca | 171 | if (cpu_is_omap15xx()) |
f577ffd7 TL |
172 | clk_set_rate(uart3_ck, 12000000); |
173 | } | |
f577ffd7 TL |
174 | break; |
175 | } | |
176 | omap_serial_reset(&serial_platform_data[i]); | |
177 | } | |
178 | } | |
179 | ||
7c38cf02 TL |
180 | #ifdef CONFIG_OMAP_SERIAL_WAKE |
181 | ||
0cd61b68 | 182 | static irqreturn_t omap_serial_wake_interrupt(int irq, void *dev_id) |
7c38cf02 TL |
183 | { |
184 | /* Need to do something with serial port right after wake-up? */ | |
185 | return IRQ_HANDLED; | |
186 | } | |
187 | ||
188 | /* | |
189 | * Reroutes serial RX lines to GPIO lines for the duration of | |
190 | * sleep to allow waking up the device from serial port even | |
191 | * in deep sleep. | |
192 | */ | |
193 | void omap_serial_wake_trigger(int enable) | |
194 | { | |
195 | if (!cpu_is_omap16xx()) | |
196 | return; | |
197 | ||
198 | if (uart1_ck != NULL) { | |
199 | if (enable) | |
200 | omap_cfg_reg(V14_16XX_GPIO37); | |
201 | else | |
202 | omap_cfg_reg(V14_16XX_UART1_RX); | |
203 | } | |
204 | if (uart2_ck != NULL) { | |
205 | if (enable) | |
206 | omap_cfg_reg(R9_16XX_GPIO18); | |
207 | else | |
208 | omap_cfg_reg(R9_16XX_UART2_RX); | |
209 | } | |
210 | if (uart3_ck != NULL) { | |
211 | if (enable) | |
212 | omap_cfg_reg(L14_16XX_GPIO49); | |
213 | else | |
214 | omap_cfg_reg(L14_16XX_UART3_RX); | |
215 | } | |
216 | } | |
217 | ||
218 | static void __init omap_serial_set_port_wakeup(int gpio_nr) | |
219 | { | |
220 | int ret; | |
221 | ||
f2d18fea | 222 | ret = gpio_request(gpio_nr, "UART wake"); |
7c38cf02 TL |
223 | if (ret < 0) { |
224 | printk(KERN_ERR "Could not request UART wake GPIO: %i\n", | |
225 | gpio_nr); | |
226 | return; | |
227 | } | |
40e3925b | 228 | gpio_direction_input(gpio_nr); |
15f74b03 | 229 | ret = request_irq(gpio_to_irq(gpio_nr), &omap_serial_wake_interrupt, |
52e405ea | 230 | IRQF_TRIGGER_RISING, "serial wakeup", NULL); |
7c38cf02 | 231 | if (ret) { |
f2d18fea | 232 | gpio_free(gpio_nr); |
7c38cf02 TL |
233 | printk(KERN_ERR "No interrupt for UART wake GPIO: %i\n", |
234 | gpio_nr); | |
235 | return; | |
236 | } | |
15f74b03 | 237 | enable_irq_wake(gpio_to_irq(gpio_nr)); |
7c38cf02 TL |
238 | } |
239 | ||
240 | static int __init omap_serial_wakeup_init(void) | |
241 | { | |
242 | if (!cpu_is_omap16xx()) | |
243 | return 0; | |
244 | ||
245 | if (uart1_ck != NULL) | |
246 | omap_serial_set_port_wakeup(37); | |
247 | if (uart2_ck != NULL) | |
248 | omap_serial_set_port_wakeup(18); | |
249 | if (uart3_ck != NULL) | |
250 | omap_serial_set_port_wakeup(49); | |
251 | ||
252 | return 0; | |
253 | } | |
254 | late_initcall(omap_serial_wakeup_init); | |
255 | ||
256 | #endif /* CONFIG_OMAP_SERIAL_WAKE */ | |
257 | ||
f577ffd7 TL |
258 | static int __init omap_init(void) |
259 | { | |
7f9187c2 TL |
260 | if (!cpu_class_is_omap1()) |
261 | return -ENODEV; | |
262 | ||
f577ffd7 TL |
263 | return platform_device_register(&serial_device); |
264 | } | |
265 | arch_initcall(omap_init); |