diff options
author | Gregory Bean <gbean@codeaurora.org> | 2010-09-10 18:03:36 -0400 |
---|---|---|
committer | Daniel Walker <dwalker@codeaurora.org> | 2010-10-06 12:01:19 -0400 |
commit | 2783cc265cc57c4bbf788b75fa8c3f06259dffd1 (patch) | |
tree | bb8d1b52c83ee451fd9b06e4bb4df5d2ed4bb1f3 /arch/arm/mach-msm/gpio.c | |
parent | ab78cde589e89afa039a13bc75d23d249f1c1200 (diff) |
msm: add gpio driver for single-core SoCs.
Install a gpiolib driver supporting the on-chip gpios for
single-core MSMs in the 7x00 family, including 7x00A, 7x25, 7x27,
7x30, 8x50, and 8x50a.
As part of the ongoing effort to converge on a common code base,
this driver is based on the Google-Android msmgpio driver, whose
authors include Brian Swetland and Arve Hjønnevåg.
Cc: Arve Hjønnevåg <arve@android.com>
Cc: H Hartley Sweeten <hartleys@visionengravers.com>
Cc: Ryan Mallon <ryan@bluewatersys.com>
Cc: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Gregory Bean <gbean@codeaurora.org>
Signed-off-by: Daniel Walker <dwalker@codeaurora.org>
Diffstat (limited to 'arch/arm/mach-msm/gpio.c')
-rw-r--r-- | arch/arm/mach-msm/gpio.c | 358 |
1 files changed, 358 insertions, 0 deletions
diff --git a/arch/arm/mach-msm/gpio.c b/arch/arm/mach-msm/gpio.c new file mode 100644 index 000000000000..5040f1cb64f9 --- /dev/null +++ b/arch/arm/mach-msm/gpio.c | |||
@@ -0,0 +1,358 @@ | |||
1 | /* linux/arch/arm/mach-msm/gpio.c | ||
2 | * | ||
3 | * Copyright (C) 2007 Google, Inc. | ||
4 | * Copyright (c) 2009-2010, Code Aurora Forum. All rights reserved. | ||
5 | * | ||
6 | * This software is licensed under the terms of the GNU General Public | ||
7 | * License version 2, as published by the Free Software Foundation, and | ||
8 | * may be copied, distributed, and modified under those terms. | ||
9 | * | ||
10 | * This program is distributed in the hope that it will be useful, | ||
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
13 | * GNU General Public License for more details. | ||
14 | * | ||
15 | */ | ||
16 | |||
17 | #include <linux/bitops.h> | ||
18 | #include <linux/gpio.h> | ||
19 | #include <linux/interrupt.h> | ||
20 | #include <linux/io.h> | ||
21 | #include <linux/irq.h> | ||
22 | #include <linux/module.h> | ||
23 | #include "gpio_hw.h" | ||
24 | |||
25 | #define FIRST_GPIO_IRQ MSM_GPIO_TO_INT(0) | ||
26 | |||
27 | #define MSM_GPIO_BANK(bank, first, last) \ | ||
28 | { \ | ||
29 | .regs = { \ | ||
30 | .out = MSM_GPIO_OUT_##bank, \ | ||
31 | .in = MSM_GPIO_IN_##bank, \ | ||
32 | .int_status = MSM_GPIO_INT_STATUS_##bank, \ | ||
33 | .int_clear = MSM_GPIO_INT_CLEAR_##bank, \ | ||
34 | .int_en = MSM_GPIO_INT_EN_##bank, \ | ||
35 | .int_edge = MSM_GPIO_INT_EDGE_##bank, \ | ||
36 | .int_pos = MSM_GPIO_INT_POS_##bank, \ | ||
37 | .oe = MSM_GPIO_OE_##bank, \ | ||
38 | }, \ | ||
39 | .chip = { \ | ||
40 | .base = (first), \ | ||
41 | .ngpio = (last) - (first) + 1, \ | ||
42 | .get = msm_gpio_get, \ | ||
43 | .set = msm_gpio_set, \ | ||
44 | .direction_input = msm_gpio_direction_input, \ | ||
45 | .direction_output = msm_gpio_direction_output, \ | ||
46 | .to_irq = msm_gpio_to_irq, \ | ||
47 | } \ | ||
48 | } | ||
49 | |||
50 | #define MSM_GPIO_BROKEN_INT_CLEAR 1 | ||
51 | |||
52 | struct msm_gpio_regs { | ||
53 | void __iomem *out; | ||
54 | void __iomem *in; | ||
55 | void __iomem *int_status; | ||
56 | void __iomem *int_clear; | ||
57 | void __iomem *int_en; | ||
58 | void __iomem *int_edge; | ||
59 | void __iomem *int_pos; | ||
60 | void __iomem *oe; | ||
61 | }; | ||
62 | |||
63 | struct msm_gpio_chip { | ||
64 | spinlock_t lock; | ||
65 | struct gpio_chip chip; | ||
66 | struct msm_gpio_regs regs; | ||
67 | #if MSM_GPIO_BROKEN_INT_CLEAR | ||
68 | unsigned int_status_copy; | ||
69 | #endif | ||
70 | unsigned int both_edge_detect; | ||
71 | unsigned int int_enable[2]; /* 0: awake, 1: sleep */ | ||
72 | }; | ||
73 | |||
74 | static int msm_gpio_write(struct msm_gpio_chip *msm_chip, | ||
75 | unsigned offset, unsigned on) | ||
76 | { | ||
77 | unsigned mask = BIT(offset); | ||
78 | unsigned val; | ||
79 | |||
80 | val = readl(msm_chip->regs.out); | ||
81 | if (on) | ||
82 | writel(val | mask, msm_chip->regs.out); | ||
83 | else | ||
84 | writel(val & ~mask, msm_chip->regs.out); | ||
85 | return 0; | ||
86 | } | ||
87 | |||
88 | static void msm_gpio_update_both_edge_detect(struct msm_gpio_chip *msm_chip) | ||
89 | { | ||
90 | int loop_limit = 100; | ||
91 | unsigned pol, val, val2, intstat; | ||
92 | do { | ||
93 | val = readl(msm_chip->regs.in); | ||
94 | pol = readl(msm_chip->regs.int_pos); | ||
95 | pol = (pol & ~msm_chip->both_edge_detect) | | ||
96 | (~val & msm_chip->both_edge_detect); | ||
97 | writel(pol, msm_chip->regs.int_pos); | ||
98 | intstat = readl(msm_chip->regs.int_status); | ||
99 | val2 = readl(msm_chip->regs.in); | ||
100 | if (((val ^ val2) & msm_chip->both_edge_detect & ~intstat) == 0) | ||
101 | return; | ||
102 | } while (loop_limit-- > 0); | ||
103 | printk(KERN_ERR "msm_gpio_update_both_edge_detect, " | ||
104 | "failed to reach stable state %x != %x\n", val, val2); | ||
105 | } | ||
106 | |||
107 | static int msm_gpio_clear_detect_status(struct msm_gpio_chip *msm_chip, | ||
108 | unsigned offset) | ||
109 | { | ||
110 | unsigned bit = BIT(offset); | ||
111 | |||
112 | #if MSM_GPIO_BROKEN_INT_CLEAR | ||
113 | /* Save interrupts that already triggered before we loose them. */ | ||
114 | /* Any interrupt that triggers between the read of int_status */ | ||
115 | /* and the write to int_clear will still be lost though. */ | ||
116 | msm_chip->int_status_copy |= readl(msm_chip->regs.int_status); | ||
117 | msm_chip->int_status_copy &= ~bit; | ||
118 | #endif | ||
119 | writel(bit, msm_chip->regs.int_clear); | ||
120 | msm_gpio_update_both_edge_detect(msm_chip); | ||
121 | return 0; | ||
122 | } | ||
123 | |||
124 | static int msm_gpio_direction_input(struct gpio_chip *chip, unsigned offset) | ||
125 | { | ||
126 | struct msm_gpio_chip *msm_chip; | ||
127 | unsigned long irq_flags; | ||
128 | |||
129 | msm_chip = container_of(chip, struct msm_gpio_chip, chip); | ||
130 | spin_lock_irqsave(&msm_chip->lock, irq_flags); | ||
131 | writel(readl(msm_chip->regs.oe) & ~BIT(offset), msm_chip->regs.oe); | ||
132 | spin_unlock_irqrestore(&msm_chip->lock, irq_flags); | ||
133 | return 0; | ||
134 | } | ||
135 | |||
136 | static int | ||
137 | msm_gpio_direction_output(struct gpio_chip *chip, unsigned offset, int value) | ||
138 | { | ||
139 | struct msm_gpio_chip *msm_chip; | ||
140 | unsigned long irq_flags; | ||
141 | |||
142 | msm_chip = container_of(chip, struct msm_gpio_chip, chip); | ||
143 | spin_lock_irqsave(&msm_chip->lock, irq_flags); | ||
144 | msm_gpio_write(msm_chip, offset, value); | ||
145 | writel(readl(msm_chip->regs.oe) | BIT(offset), msm_chip->regs.oe); | ||
146 | spin_unlock_irqrestore(&msm_chip->lock, irq_flags); | ||
147 | return 0; | ||
148 | } | ||
149 | |||
150 | static int msm_gpio_get(struct gpio_chip *chip, unsigned offset) | ||
151 | { | ||
152 | struct msm_gpio_chip *msm_chip; | ||
153 | |||
154 | msm_chip = container_of(chip, struct msm_gpio_chip, chip); | ||
155 | return (readl(msm_chip->regs.in) & (1U << offset)) ? 1 : 0; | ||
156 | } | ||
157 | |||
158 | static void msm_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | ||
159 | { | ||
160 | struct msm_gpio_chip *msm_chip; | ||
161 | unsigned long irq_flags; | ||
162 | |||
163 | msm_chip = container_of(chip, struct msm_gpio_chip, chip); | ||
164 | spin_lock_irqsave(&msm_chip->lock, irq_flags); | ||
165 | msm_gpio_write(msm_chip, offset, value); | ||
166 | spin_unlock_irqrestore(&msm_chip->lock, irq_flags); | ||
167 | } | ||
168 | |||
169 | static int msm_gpio_to_irq(struct gpio_chip *chip, unsigned offset) | ||
170 | { | ||
171 | return MSM_GPIO_TO_INT(chip->base + offset); | ||
172 | } | ||
173 | |||
174 | struct msm_gpio_chip msm_gpio_chips[] = { | ||
175 | #if defined(CONFIG_ARCH_MSM7X00A) | ||
176 | MSM_GPIO_BANK(0, 0, 15), | ||
177 | MSM_GPIO_BANK(1, 16, 42), | ||
178 | MSM_GPIO_BANK(2, 43, 67), | ||
179 | MSM_GPIO_BANK(3, 68, 94), | ||
180 | MSM_GPIO_BANK(4, 95, 106), | ||
181 | MSM_GPIO_BANK(5, 107, 121), | ||
182 | #elif defined(CONFIG_ARCH_MSM7X25) || defined(CONFIG_ARCH_MSM7X27) | ||
183 | MSM_GPIO_BANK(0, 0, 15), | ||
184 | MSM_GPIO_BANK(1, 16, 42), | ||
185 | MSM_GPIO_BANK(2, 43, 67), | ||
186 | MSM_GPIO_BANK(3, 68, 94), | ||
187 | MSM_GPIO_BANK(4, 95, 106), | ||
188 | MSM_GPIO_BANK(5, 107, 132), | ||
189 | #elif defined(CONFIG_ARCH_MSM7X30) | ||
190 | MSM_GPIO_BANK(0, 0, 15), | ||
191 | MSM_GPIO_BANK(1, 16, 43), | ||
192 | MSM_GPIO_BANK(2, 44, 67), | ||
193 | MSM_GPIO_BANK(3, 68, 94), | ||
194 | MSM_GPIO_BANK(4, 95, 106), | ||
195 | MSM_GPIO_BANK(5, 107, 133), | ||
196 | MSM_GPIO_BANK(6, 134, 150), | ||
197 | MSM_GPIO_BANK(7, 151, 181), | ||
198 | #elif defined(CONFIG_ARCH_QSD8X50) | ||
199 | MSM_GPIO_BANK(0, 0, 15), | ||
200 | MSM_GPIO_BANK(1, 16, 42), | ||
201 | MSM_GPIO_BANK(2, 43, 67), | ||
202 | MSM_GPIO_BANK(3, 68, 94), | ||
203 | MSM_GPIO_BANK(4, 95, 103), | ||
204 | MSM_GPIO_BANK(5, 104, 121), | ||
205 | MSM_GPIO_BANK(6, 122, 152), | ||
206 | MSM_GPIO_BANK(7, 153, 164), | ||
207 | #endif | ||
208 | }; | ||
209 | |||
210 | static void msm_gpio_irq_ack(unsigned int irq) | ||
211 | { | ||
212 | unsigned long irq_flags; | ||
213 | struct msm_gpio_chip *msm_chip = get_irq_chip_data(irq); | ||
214 | spin_lock_irqsave(&msm_chip->lock, irq_flags); | ||
215 | msm_gpio_clear_detect_status(msm_chip, | ||
216 | irq - gpio_to_irq(msm_chip->chip.base)); | ||
217 | spin_unlock_irqrestore(&msm_chip->lock, irq_flags); | ||
218 | } | ||
219 | |||
220 | static void msm_gpio_irq_mask(unsigned int irq) | ||
221 | { | ||
222 | unsigned long irq_flags; | ||
223 | struct msm_gpio_chip *msm_chip = get_irq_chip_data(irq); | ||
224 | unsigned offset = irq - gpio_to_irq(msm_chip->chip.base); | ||
225 | |||
226 | spin_lock_irqsave(&msm_chip->lock, irq_flags); | ||
227 | /* level triggered interrupts are also latched */ | ||
228 | if (!(readl(msm_chip->regs.int_edge) & BIT(offset))) | ||
229 | msm_gpio_clear_detect_status(msm_chip, offset); | ||
230 | msm_chip->int_enable[0] &= ~BIT(offset); | ||
231 | writel(msm_chip->int_enable[0], msm_chip->regs.int_en); | ||
232 | spin_unlock_irqrestore(&msm_chip->lock, irq_flags); | ||
233 | } | ||
234 | |||
235 | static void msm_gpio_irq_unmask(unsigned int irq) | ||
236 | { | ||
237 | unsigned long irq_flags; | ||
238 | struct msm_gpio_chip *msm_chip = get_irq_chip_data(irq); | ||
239 | unsigned offset = irq - gpio_to_irq(msm_chip->chip.base); | ||
240 | |||
241 | spin_lock_irqsave(&msm_chip->lock, irq_flags); | ||
242 | /* level triggered interrupts are also latched */ | ||
243 | if (!(readl(msm_chip->regs.int_edge) & BIT(offset))) | ||
244 | msm_gpio_clear_detect_status(msm_chip, offset); | ||
245 | msm_chip->int_enable[0] |= BIT(offset); | ||
246 | writel(msm_chip->int_enable[0], msm_chip->regs.int_en); | ||
247 | spin_unlock_irqrestore(&msm_chip->lock, irq_flags); | ||
248 | } | ||
249 | |||
250 | static int msm_gpio_irq_set_wake(unsigned int irq, unsigned int on) | ||
251 | { | ||
252 | unsigned long irq_flags; | ||
253 | struct msm_gpio_chip *msm_chip = get_irq_chip_data(irq); | ||
254 | unsigned offset = irq - gpio_to_irq(msm_chip->chip.base); | ||
255 | |||
256 | spin_lock_irqsave(&msm_chip->lock, irq_flags); | ||
257 | |||
258 | if (on) | ||
259 | msm_chip->int_enable[1] |= BIT(offset); | ||
260 | else | ||
261 | msm_chip->int_enable[1] &= ~BIT(offset); | ||
262 | |||
263 | spin_unlock_irqrestore(&msm_chip->lock, irq_flags); | ||
264 | return 0; | ||
265 | } | ||
266 | |||
267 | static int msm_gpio_irq_set_type(unsigned int irq, unsigned int flow_type) | ||
268 | { | ||
269 | unsigned long irq_flags; | ||
270 | struct msm_gpio_chip *msm_chip = get_irq_chip_data(irq); | ||
271 | unsigned offset = irq - gpio_to_irq(msm_chip->chip.base); | ||
272 | unsigned val, mask = BIT(offset); | ||
273 | |||
274 | spin_lock_irqsave(&msm_chip->lock, irq_flags); | ||
275 | val = readl(msm_chip->regs.int_edge); | ||
276 | if (flow_type & IRQ_TYPE_EDGE_BOTH) { | ||
277 | writel(val | mask, msm_chip->regs.int_edge); | ||
278 | irq_desc[irq].handle_irq = handle_edge_irq; | ||
279 | } else { | ||
280 | writel(val & ~mask, msm_chip->regs.int_edge); | ||
281 | irq_desc[irq].handle_irq = handle_level_irq; | ||
282 | } | ||
283 | if ((flow_type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) { | ||
284 | msm_chip->both_edge_detect |= mask; | ||
285 | msm_gpio_update_both_edge_detect(msm_chip); | ||
286 | } else { | ||
287 | msm_chip->both_edge_detect &= ~mask; | ||
288 | val = readl(msm_chip->regs.int_pos); | ||
289 | if (flow_type & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_HIGH)) | ||
290 | writel(val | mask, msm_chip->regs.int_pos); | ||
291 | else | ||
292 | writel(val & ~mask, msm_chip->regs.int_pos); | ||
293 | } | ||
294 | spin_unlock_irqrestore(&msm_chip->lock, irq_flags); | ||
295 | return 0; | ||
296 | } | ||
297 | |||
298 | static void msm_gpio_irq_handler(unsigned int irq, struct irq_desc *desc) | ||
299 | { | ||
300 | int i, j, mask; | ||
301 | unsigned val; | ||
302 | |||
303 | for (i = 0; i < ARRAY_SIZE(msm_gpio_chips); i++) { | ||
304 | struct msm_gpio_chip *msm_chip = &msm_gpio_chips[i]; | ||
305 | val = readl(msm_chip->regs.int_status); | ||
306 | val &= msm_chip->int_enable[0]; | ||
307 | while (val) { | ||
308 | mask = val & -val; | ||
309 | j = fls(mask) - 1; | ||
310 | /* printk("%s %08x %08x bit %d gpio %d irq %d\n", | ||
311 | __func__, v, m, j, msm_chip->chip.start + j, | ||
312 | FIRST_GPIO_IRQ + msm_chip->chip.start + j); */ | ||
313 | val &= ~mask; | ||
314 | generic_handle_irq(FIRST_GPIO_IRQ + | ||
315 | msm_chip->chip.base + j); | ||
316 | } | ||
317 | } | ||
318 | desc->chip->ack(irq); | ||
319 | } | ||
320 | |||
321 | static struct irq_chip msm_gpio_irq_chip = { | ||
322 | .name = "msmgpio", | ||
323 | .ack = msm_gpio_irq_ack, | ||
324 | .mask = msm_gpio_irq_mask, | ||
325 | .unmask = msm_gpio_irq_unmask, | ||
326 | .set_wake = msm_gpio_irq_set_wake, | ||
327 | .set_type = msm_gpio_irq_set_type, | ||
328 | }; | ||
329 | |||
330 | static int __init msm_init_gpio(void) | ||
331 | { | ||
332 | int i, j = 0; | ||
333 | |||
334 | for (i = FIRST_GPIO_IRQ; i < FIRST_GPIO_IRQ + NR_GPIO_IRQS; i++) { | ||
335 | if (i - FIRST_GPIO_IRQ >= | ||
336 | msm_gpio_chips[j].chip.base + | ||
337 | msm_gpio_chips[j].chip.ngpio) | ||
338 | j++; | ||
339 | set_irq_chip_data(i, &msm_gpio_chips[j]); | ||
340 | set_irq_chip(i, &msm_gpio_irq_chip); | ||
341 | set_irq_handler(i, handle_edge_irq); | ||
342 | set_irq_flags(i, IRQF_VALID); | ||
343 | } | ||
344 | |||
345 | for (i = 0; i < ARRAY_SIZE(msm_gpio_chips); i++) { | ||
346 | spin_lock_init(&msm_gpio_chips[i].lock); | ||
347 | writel(0, msm_gpio_chips[i].regs.int_en); | ||
348 | gpiochip_add(&msm_gpio_chips[i].chip); | ||
349 | } | ||
350 | |||
351 | set_irq_chained_handler(INT_GPIO_GROUP1, msm_gpio_irq_handler); | ||
352 | set_irq_chained_handler(INT_GPIO_GROUP2, msm_gpio_irq_handler); | ||
353 | set_irq_wake(INT_GPIO_GROUP1, 1); | ||
354 | set_irq_wake(INT_GPIO_GROUP2, 2); | ||
355 | return 0; | ||
356 | } | ||
357 | |||
358 | postcore_initcall(msm_init_gpio); | ||