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923a081c PM |
1 | /* |
2 | * linux/arch/arm/mach-msm/gpio.c | |
3 | * | |
4 | * Copyright (C) 2005 HP Labs | |
5 | * Copyright (C) 2008 Google, Inc. | |
6 | * Copyright (C) 2009 Pavel Machek <pavel@ucw.cz> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/io.h> | |
17 | #include <linux/irq.h> | |
8dadeea1 | 18 | #include <linux/interrupt.h> |
923a081c PM |
19 | #include <linux/gpio.h> |
20 | ||
21 | #include "board-trout.h" | |
22 | ||
8dadeea1 DW |
23 | static uint8_t trout_int_mask[2] = { |
24 | [0] = 0xff, /* mask all interrupts */ | |
25 | [1] = 0xff, | |
26 | }; | |
27 | static uint8_t trout_sleep_int_mask[] = { | |
28 | [0] = 0xff, | |
29 | [1] = 0xff, | |
30 | }; | |
31 | ||
923a081c PM |
32 | struct msm_gpio_chip { |
33 | struct gpio_chip chip; | |
34 | void __iomem *reg; /* Base of register bank */ | |
35 | u8 shadow; | |
36 | }; | |
37 | ||
38 | #define to_msm_gpio_chip(c) container_of(c, struct msm_gpio_chip, chip) | |
39 | ||
40 | static int msm_gpiolib_get(struct gpio_chip *chip, unsigned offset) | |
41 | { | |
42 | struct msm_gpio_chip *msm_gpio = to_msm_gpio_chip(chip); | |
43 | unsigned mask = 1 << offset; | |
44 | ||
45 | return !!(readb(msm_gpio->reg) & mask); | |
46 | } | |
47 | ||
48 | static void msm_gpiolib_set(struct gpio_chip *chip, unsigned offset, int val) | |
49 | { | |
50 | struct msm_gpio_chip *msm_gpio = to_msm_gpio_chip(chip); | |
51 | unsigned mask = 1 << offset; | |
52 | ||
53 | if (val) | |
54 | msm_gpio->shadow |= mask; | |
55 | else | |
56 | msm_gpio->shadow &= ~mask; | |
57 | ||
58 | writeb(msm_gpio->shadow, msm_gpio->reg); | |
59 | } | |
60 | ||
61 | static int msm_gpiolib_direction_input(struct gpio_chip *chip, | |
62 | unsigned offset) | |
63 | { | |
64 | msm_gpiolib_set(chip, offset, 0); | |
65 | return 0; | |
66 | } | |
67 | ||
68 | static int msm_gpiolib_direction_output(struct gpio_chip *chip, | |
69 | unsigned offset, int val) | |
70 | { | |
71 | msm_gpiolib_set(chip, offset, val); | |
72 | return 0; | |
73 | } | |
74 | ||
940f2efc DW |
75 | static int trout_gpio_to_irq(struct gpio_chip *chip, unsigned offset) |
76 | { | |
77 | struct msm_gpio_chip *msm_gpio = to_msm_gpio_chip(chip); | |
78 | ||
79 | return TROUT_GPIO_TO_INT(offset + chip->base); | |
80 | } | |
81 | ||
923a081c PM |
82 | #define TROUT_GPIO_BANK(name, reg_num, base_gpio, shadow_val) \ |
83 | { \ | |
84 | .chip = { \ | |
85 | .label = name, \ | |
86 | .direction_input = msm_gpiolib_direction_input,\ | |
87 | .direction_output = msm_gpiolib_direction_output, \ | |
88 | .get = msm_gpiolib_get, \ | |
89 | .set = msm_gpiolib_set, \ | |
940f2efc | 90 | .to_irq = trout_gpio_to_irq, \ |
923a081c PM |
91 | .base = base_gpio, \ |
92 | .ngpio = 8, \ | |
93 | }, \ | |
94 | .reg = (void *) reg_num + TROUT_CPLD_BASE, \ | |
95 | .shadow = shadow_val, \ | |
96 | } | |
97 | ||
98 | static struct msm_gpio_chip msm_gpio_banks[] = { | |
99 | #if defined(CONFIG_MSM_DEBUG_UART1) | |
100 | /* H2W pins <-> UART1 */ | |
101 | TROUT_GPIO_BANK("MISC2", 0x00, TROUT_GPIO_MISC2_BASE, 0x40), | |
102 | #else | |
103 | /* H2W pins <-> UART3, Bluetooth <-> UART1 */ | |
104 | TROUT_GPIO_BANK("MISC2", 0x00, TROUT_GPIO_MISC2_BASE, 0x80), | |
105 | #endif | |
106 | /* I2C pull */ | |
107 | TROUT_GPIO_BANK("MISC3", 0x02, TROUT_GPIO_MISC3_BASE, 0x04), | |
108 | TROUT_GPIO_BANK("MISC4", 0x04, TROUT_GPIO_MISC4_BASE, 0), | |
109 | /* mmdi 32k en */ | |
110 | TROUT_GPIO_BANK("MISC5", 0x06, TROUT_GPIO_MISC5_BASE, 0x04), | |
111 | TROUT_GPIO_BANK("INT2", 0x08, TROUT_GPIO_INT2_BASE, 0), | |
112 | TROUT_GPIO_BANK("MISC1", 0x0a, TROUT_GPIO_MISC1_BASE, 0), | |
113 | TROUT_GPIO_BANK("VIRTUAL", 0x12, TROUT_GPIO_VIRTUAL_BASE, 0), | |
114 | }; | |
115 | ||
8dadeea1 DW |
116 | static void trout_gpio_irq_ack(unsigned int irq) |
117 | { | |
118 | int bank = TROUT_INT_TO_BANK(irq); | |
119 | uint8_t mask = TROUT_INT_TO_MASK(irq); | |
120 | int reg = TROUT_BANK_TO_STAT_REG(bank); | |
121 | /*printk(KERN_INFO "trout_gpio_irq_ack irq %d\n", irq);*/ | |
122 | writeb(mask, TROUT_CPLD_BASE + reg); | |
123 | } | |
124 | ||
125 | static void trout_gpio_irq_mask(unsigned int irq) | |
126 | { | |
127 | unsigned long flags; | |
128 | uint8_t reg_val; | |
129 | int bank = TROUT_INT_TO_BANK(irq); | |
130 | uint8_t mask = TROUT_INT_TO_MASK(irq); | |
131 | int reg = TROUT_BANK_TO_MASK_REG(bank); | |
132 | ||
133 | local_irq_save(flags); | |
134 | reg_val = trout_int_mask[bank] |= mask; | |
135 | /*printk(KERN_INFO "trout_gpio_irq_mask irq %d => %d:%02x\n", | |
136 | irq, bank, reg_val);*/ | |
137 | writeb(reg_val, TROUT_CPLD_BASE + reg); | |
138 | local_irq_restore(flags); | |
139 | } | |
140 | ||
141 | static void trout_gpio_irq_unmask(unsigned int irq) | |
142 | { | |
143 | unsigned long flags; | |
144 | uint8_t reg_val; | |
145 | int bank = TROUT_INT_TO_BANK(irq); | |
146 | uint8_t mask = TROUT_INT_TO_MASK(irq); | |
147 | int reg = TROUT_BANK_TO_MASK_REG(bank); | |
148 | ||
149 | local_irq_save(flags); | |
150 | reg_val = trout_int_mask[bank] &= ~mask; | |
151 | /*printk(KERN_INFO "trout_gpio_irq_unmask irq %d => %d:%02x\n", | |
152 | irq, bank, reg_val);*/ | |
153 | writeb(reg_val, TROUT_CPLD_BASE + reg); | |
154 | local_irq_restore(flags); | |
155 | } | |
156 | ||
157 | int trout_gpio_irq_set_wake(unsigned int irq, unsigned int on) | |
158 | { | |
159 | unsigned long flags; | |
160 | int bank = TROUT_INT_TO_BANK(irq); | |
161 | uint8_t mask = TROUT_INT_TO_MASK(irq); | |
162 | ||
163 | local_irq_save(flags); | |
164 | if(on) | |
165 | trout_sleep_int_mask[bank] &= ~mask; | |
166 | else | |
167 | trout_sleep_int_mask[bank] |= mask; | |
168 | local_irq_restore(flags); | |
169 | return 0; | |
170 | } | |
171 | ||
172 | static void trout_gpio_irq_handler(unsigned int irq, struct irq_desc *desc) | |
173 | { | |
174 | int j, m; | |
175 | unsigned v; | |
176 | int bank; | |
177 | int stat_reg; | |
178 | int int_base = TROUT_INT_START; | |
179 | uint8_t int_mask; | |
180 | ||
181 | for (bank = 0; bank < 2; bank++) { | |
182 | stat_reg = TROUT_BANK_TO_STAT_REG(bank); | |
183 | v = readb(TROUT_CPLD_BASE + stat_reg); | |
184 | int_mask = trout_int_mask[bank]; | |
185 | if (v & int_mask) { | |
186 | writeb(v & int_mask, TROUT_CPLD_BASE + stat_reg); | |
187 | printk(KERN_ERR "trout_gpio_irq_handler: got masked " | |
188 | "interrupt: %d:%02x\n", bank, v & int_mask); | |
189 | } | |
190 | v &= ~int_mask; | |
191 | while (v) { | |
192 | m = v & -v; | |
193 | j = fls(m) - 1; | |
194 | /*printk(KERN_INFO "msm_gpio_irq_handler %d:%02x %02x b" | |
195 | "it %d irq %d\n", bank, v, m, j, int_base + j);*/ | |
196 | v &= ~m; | |
197 | generic_handle_irq(int_base + j); | |
198 | } | |
199 | int_base += TROUT_INT_BANK0_COUNT; | |
200 | } | |
201 | desc->chip->ack(irq); | |
202 | } | |
203 | ||
204 | static struct irq_chip trout_gpio_irq_chip = { | |
205 | .name = "troutgpio", | |
206 | .ack = trout_gpio_irq_ack, | |
207 | .mask = trout_gpio_irq_mask, | |
208 | .unmask = trout_gpio_irq_unmask, | |
209 | .set_wake = trout_gpio_irq_set_wake, | |
210 | }; | |
211 | ||
923a081c PM |
212 | /* |
213 | * Called from the processor-specific init to enable GPIO pin support. | |
214 | */ | |
215 | int __init trout_init_gpio(void) | |
216 | { | |
217 | int i; | |
8dadeea1 DW |
218 | for(i = TROUT_INT_START; i <= TROUT_INT_END; i++) { |
219 | set_irq_chip(i, &trout_gpio_irq_chip); | |
220 | set_irq_handler(i, handle_edge_irq); | |
221 | set_irq_flags(i, IRQF_VALID); | |
222 | } | |
923a081c PM |
223 | |
224 | for (i = 0; i < ARRAY_SIZE(msm_gpio_banks); i++) | |
225 | gpiochip_add(&msm_gpio_banks[i].chip); | |
226 | ||
8dadeea1 DW |
227 | set_irq_type(MSM_GPIO_TO_INT(17), IRQF_TRIGGER_HIGH); |
228 | set_irq_chained_handler(MSM_GPIO_TO_INT(17), trout_gpio_irq_handler); | |
229 | set_irq_wake(MSM_GPIO_TO_INT(17), 1); | |
230 | ||
923a081c PM |
231 | return 0; |
232 | } | |
233 | ||
234 | postcore_initcall(trout_init_gpio); | |
235 |