Commit | Line | Data |
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2ec1d359 AR |
1 | /* |
2 | * Generic GPIO driver for logic cells found in the Nomadik SoC | |
3 | * | |
4 | * Copyright (C) 2008,2009 STMicroelectronics | |
5 | * Copyright (C) 2009 Alessandro Rubini <rubini@unipv.it> | |
6 | * Rewritten based on work by Prafulla WADASKAR <prafulla.wadaskar@st.com> | |
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 version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/device.h> | |
3e3c62ca | 16 | #include <linux/platform_device.h> |
2ec1d359 AR |
17 | #include <linux/io.h> |
18 | #include <linux/gpio.h> | |
19 | #include <linux/spinlock.h> | |
20 | #include <linux/interrupt.h> | |
21 | #include <linux/irq.h> | |
22 | ||
23 | #include <mach/hardware.h> | |
24 | #include <mach/gpio.h> | |
25 | ||
26 | /* | |
27 | * The GPIO module in the Nomadik family of Systems-on-Chip is an | |
28 | * AMBA device, managing 32 pins and alternate functions. The logic block | |
29 | * is currently only used in the Nomadik. | |
30 | * | |
31 | * Symbols in this file are called "nmk_gpio" for "nomadik gpio" | |
32 | */ | |
33 | ||
34 | #define NMK_GPIO_PER_CHIP 32 | |
35 | struct nmk_gpio_chip { | |
36 | struct gpio_chip chip; | |
37 | void __iomem *addr; | |
38 | unsigned int parent_irq; | |
c0fcb8db | 39 | spinlock_t lock; |
2ec1d359 AR |
40 | /* Keep track of configured edges */ |
41 | u32 edge_rising; | |
42 | u32 edge_falling; | |
43 | }; | |
44 | ||
45 | /* Mode functions */ | |
46 | int nmk_gpio_set_mode(int gpio, int gpio_mode) | |
47 | { | |
48 | struct nmk_gpio_chip *nmk_chip; | |
49 | unsigned long flags; | |
50 | u32 afunc, bfunc, bit; | |
51 | ||
52 | nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio)); | |
53 | if (!nmk_chip) | |
54 | return -EINVAL; | |
55 | ||
56 | bit = 1 << (gpio - nmk_chip->chip.base); | |
57 | ||
58 | spin_lock_irqsave(&nmk_chip->lock, flags); | |
59 | afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & ~bit; | |
60 | bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & ~bit; | |
61 | if (gpio_mode & NMK_GPIO_ALT_A) | |
62 | afunc |= bit; | |
63 | if (gpio_mode & NMK_GPIO_ALT_B) | |
64 | bfunc |= bit; | |
65 | writel(afunc, nmk_chip->addr + NMK_GPIO_AFSLA); | |
66 | writel(bfunc, nmk_chip->addr + NMK_GPIO_AFSLB); | |
67 | spin_unlock_irqrestore(&nmk_chip->lock, flags); | |
68 | ||
69 | return 0; | |
70 | } | |
71 | EXPORT_SYMBOL(nmk_gpio_set_mode); | |
72 | ||
73 | int nmk_gpio_get_mode(int gpio) | |
74 | { | |
75 | struct nmk_gpio_chip *nmk_chip; | |
76 | u32 afunc, bfunc, bit; | |
77 | ||
78 | nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio)); | |
79 | if (!nmk_chip) | |
80 | return -EINVAL; | |
81 | ||
82 | bit = 1 << (gpio - nmk_chip->chip.base); | |
83 | ||
84 | afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & bit; | |
85 | bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & bit; | |
86 | ||
87 | return (afunc ? NMK_GPIO_ALT_A : 0) | (bfunc ? NMK_GPIO_ALT_B : 0); | |
88 | } | |
89 | EXPORT_SYMBOL(nmk_gpio_get_mode); | |
90 | ||
91 | ||
92 | /* IRQ functions */ | |
93 | static inline int nmk_gpio_get_bitmask(int gpio) | |
94 | { | |
95 | return 1 << (gpio % 32); | |
96 | } | |
97 | ||
98 | static void nmk_gpio_irq_ack(unsigned int irq) | |
99 | { | |
100 | int gpio; | |
101 | struct nmk_gpio_chip *nmk_chip; | |
102 | ||
103 | gpio = NOMADIK_IRQ_TO_GPIO(irq); | |
104 | nmk_chip = get_irq_chip_data(irq); | |
105 | if (!nmk_chip) | |
106 | return; | |
107 | writel(nmk_gpio_get_bitmask(gpio), nmk_chip->addr + NMK_GPIO_IC); | |
108 | } | |
109 | ||
040e5ecd RV |
110 | static void __nmk_gpio_irq_modify(struct nmk_gpio_chip *nmk_chip, |
111 | int gpio, bool enable) | |
2ec1d359 | 112 | { |
040e5ecd RV |
113 | u32 bitmask = nmk_gpio_get_bitmask(gpio); |
114 | u32 reg; | |
2ec1d359 | 115 | |
040e5ecd | 116 | /* we must individually set/clear the two edges */ |
2ec1d359 | 117 | if (nmk_chip->edge_rising & bitmask) { |
6b07aaed | 118 | reg = readl(nmk_chip->addr + NMK_GPIO_RIMSC); |
040e5ecd RV |
119 | if (enable) |
120 | reg |= bitmask; | |
121 | else | |
122 | reg &= ~bitmask; | |
6b07aaed | 123 | writel(reg, nmk_chip->addr + NMK_GPIO_RIMSC); |
2ec1d359 AR |
124 | } |
125 | if (nmk_chip->edge_falling & bitmask) { | |
6b07aaed | 126 | reg = readl(nmk_chip->addr + NMK_GPIO_FIMSC); |
040e5ecd RV |
127 | if (enable) |
128 | reg |= bitmask; | |
129 | else | |
130 | reg &= ~bitmask; | |
6b07aaed | 131 | writel(reg, nmk_chip->addr + NMK_GPIO_FIMSC); |
2ec1d359 | 132 | } |
040e5ecd | 133 | } |
2ec1d359 | 134 | |
040e5ecd | 135 | static void nmk_gpio_irq_modify(unsigned int irq, bool enable) |
2ec1d359 AR |
136 | { |
137 | int gpio; | |
138 | struct nmk_gpio_chip *nmk_chip; | |
139 | unsigned long flags; | |
040e5ecd | 140 | u32 bitmask; |
2ec1d359 AR |
141 | |
142 | gpio = NOMADIK_IRQ_TO_GPIO(irq); | |
143 | nmk_chip = get_irq_chip_data(irq); | |
144 | bitmask = nmk_gpio_get_bitmask(gpio); | |
145 | if (!nmk_chip) | |
146 | return; | |
147 | ||
2ec1d359 | 148 | spin_lock_irqsave(&nmk_chip->lock, flags); |
040e5ecd | 149 | __nmk_gpio_irq_modify(nmk_chip, gpio, enable); |
2ec1d359 AR |
150 | spin_unlock_irqrestore(&nmk_chip->lock, flags); |
151 | } | |
152 | ||
040e5ecd RV |
153 | static void nmk_gpio_irq_mask(unsigned int irq) |
154 | { | |
155 | nmk_gpio_irq_modify(irq, false); | |
156 | }; | |
157 | ||
158 | static void nmk_gpio_irq_unmask(unsigned int irq) | |
159 | { | |
160 | nmk_gpio_irq_modify(irq, true); | |
161 | } | |
162 | ||
2ec1d359 AR |
163 | static int nmk_gpio_irq_set_type(unsigned int irq, unsigned int type) |
164 | { | |
7a852d80 | 165 | bool enabled = !(irq_to_desc(irq)->status & IRQ_DISABLED); |
2ec1d359 AR |
166 | int gpio; |
167 | struct nmk_gpio_chip *nmk_chip; | |
168 | unsigned long flags; | |
169 | u32 bitmask; | |
170 | ||
171 | gpio = NOMADIK_IRQ_TO_GPIO(irq); | |
172 | nmk_chip = get_irq_chip_data(irq); | |
173 | bitmask = nmk_gpio_get_bitmask(gpio); | |
174 | if (!nmk_chip) | |
175 | return -EINVAL; | |
176 | ||
177 | if (type & IRQ_TYPE_LEVEL_HIGH) | |
178 | return -EINVAL; | |
179 | if (type & IRQ_TYPE_LEVEL_LOW) | |
180 | return -EINVAL; | |
181 | ||
182 | spin_lock_irqsave(&nmk_chip->lock, flags); | |
183 | ||
7a852d80 RV |
184 | if (enabled) |
185 | __nmk_gpio_irq_modify(nmk_chip, gpio, false); | |
186 | ||
2ec1d359 AR |
187 | nmk_chip->edge_rising &= ~bitmask; |
188 | if (type & IRQ_TYPE_EDGE_RISING) | |
189 | nmk_chip->edge_rising |= bitmask; | |
2ec1d359 AR |
190 | |
191 | nmk_chip->edge_falling &= ~bitmask; | |
192 | if (type & IRQ_TYPE_EDGE_FALLING) | |
193 | nmk_chip->edge_falling |= bitmask; | |
2ec1d359 | 194 | |
7a852d80 RV |
195 | if (enabled) |
196 | __nmk_gpio_irq_modify(nmk_chip, gpio, true); | |
2ec1d359 | 197 | |
7a852d80 | 198 | spin_unlock_irqrestore(&nmk_chip->lock, flags); |
2ec1d359 AR |
199 | |
200 | return 0; | |
201 | } | |
202 | ||
203 | static struct irq_chip nmk_gpio_irq_chip = { | |
204 | .name = "Nomadik-GPIO", | |
205 | .ack = nmk_gpio_irq_ack, | |
206 | .mask = nmk_gpio_irq_mask, | |
207 | .unmask = nmk_gpio_irq_unmask, | |
208 | .set_type = nmk_gpio_irq_set_type, | |
209 | }; | |
210 | ||
211 | static void nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc) | |
212 | { | |
213 | struct nmk_gpio_chip *nmk_chip; | |
aaedaa2b | 214 | struct irq_chip *host_chip = get_irq_chip(irq); |
2ec1d359 AR |
215 | unsigned int gpio_irq; |
216 | u32 pending; | |
217 | unsigned int first_irq; | |
218 | ||
aaedaa2b RV |
219 | if (host_chip->mask_ack) |
220 | host_chip->mask_ack(irq); | |
221 | else { | |
222 | host_chip->mask(irq); | |
223 | if (host_chip->ack) | |
224 | host_chip->ack(irq); | |
225 | } | |
226 | ||
2ec1d359 AR |
227 | nmk_chip = get_irq_data(irq); |
228 | first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base); | |
229 | while ( (pending = readl(nmk_chip->addr + NMK_GPIO_IS)) ) { | |
230 | gpio_irq = first_irq + __ffs(pending); | |
231 | generic_handle_irq(gpio_irq); | |
232 | } | |
aaedaa2b RV |
233 | |
234 | host_chip->unmask(irq); | |
2ec1d359 AR |
235 | } |
236 | ||
237 | static int nmk_gpio_init_irq(struct nmk_gpio_chip *nmk_chip) | |
238 | { | |
239 | unsigned int first_irq; | |
240 | int i; | |
241 | ||
242 | first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base); | |
243 | for (i = first_irq; i < first_irq + NMK_GPIO_PER_CHIP; i++) { | |
244 | set_irq_chip(i, &nmk_gpio_irq_chip); | |
245 | set_irq_handler(i, handle_edge_irq); | |
246 | set_irq_flags(i, IRQF_VALID); | |
247 | set_irq_chip_data(i, nmk_chip); | |
248 | } | |
249 | set_irq_chained_handler(nmk_chip->parent_irq, nmk_gpio_irq_handler); | |
250 | set_irq_data(nmk_chip->parent_irq, nmk_chip); | |
251 | return 0; | |
252 | } | |
253 | ||
254 | /* I/O Functions */ | |
255 | static int nmk_gpio_make_input(struct gpio_chip *chip, unsigned offset) | |
256 | { | |
257 | struct nmk_gpio_chip *nmk_chip = | |
258 | container_of(chip, struct nmk_gpio_chip, chip); | |
259 | ||
260 | writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC); | |
261 | return 0; | |
262 | } | |
263 | ||
264 | static int nmk_gpio_make_output(struct gpio_chip *chip, unsigned offset, | |
265 | int val) | |
266 | { | |
267 | struct nmk_gpio_chip *nmk_chip = | |
268 | container_of(chip, struct nmk_gpio_chip, chip); | |
269 | ||
270 | writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRS); | |
271 | return 0; | |
272 | } | |
273 | ||
274 | static int nmk_gpio_get_input(struct gpio_chip *chip, unsigned offset) | |
275 | { | |
276 | struct nmk_gpio_chip *nmk_chip = | |
277 | container_of(chip, struct nmk_gpio_chip, chip); | |
278 | u32 bit = 1 << offset; | |
279 | ||
280 | return (readl(nmk_chip->addr + NMK_GPIO_DAT) & bit) != 0; | |
281 | } | |
282 | ||
283 | static void nmk_gpio_set_output(struct gpio_chip *chip, unsigned offset, | |
284 | int val) | |
285 | { | |
286 | struct nmk_gpio_chip *nmk_chip = | |
287 | container_of(chip, struct nmk_gpio_chip, chip); | |
288 | u32 bit = 1 << offset; | |
289 | ||
290 | if (val) | |
291 | writel(bit, nmk_chip->addr + NMK_GPIO_DATS); | |
292 | else | |
293 | writel(bit, nmk_chip->addr + NMK_GPIO_DATC); | |
294 | } | |
295 | ||
296 | /* This structure is replicated for each GPIO block allocated at probe time */ | |
297 | static struct gpio_chip nmk_gpio_template = { | |
298 | .direction_input = nmk_gpio_make_input, | |
299 | .get = nmk_gpio_get_input, | |
300 | .direction_output = nmk_gpio_make_output, | |
301 | .set = nmk_gpio_set_output, | |
302 | .ngpio = NMK_GPIO_PER_CHIP, | |
303 | .can_sleep = 0, | |
304 | }; | |
305 | ||
3e3c62ca | 306 | static int __init nmk_gpio_probe(struct platform_device *dev) |
2ec1d359 | 307 | { |
3e3c62ca | 308 | struct nmk_gpio_platform_data *pdata = dev->dev.platform_data; |
2ec1d359 AR |
309 | struct nmk_gpio_chip *nmk_chip; |
310 | struct gpio_chip *chip; | |
3e3c62ca RV |
311 | struct resource *res; |
312 | int irq; | |
2ec1d359 AR |
313 | int ret; |
314 | ||
3e3c62ca RV |
315 | if (!pdata) |
316 | return -ENODEV; | |
317 | ||
318 | res = platform_get_resource(dev, IORESOURCE_MEM, 0); | |
319 | if (!res) { | |
320 | ret = -ENOENT; | |
321 | goto out; | |
322 | } | |
323 | ||
324 | irq = platform_get_irq(dev, 0); | |
325 | if (irq < 0) { | |
326 | ret = irq; | |
327 | goto out; | |
328 | } | |
329 | ||
330 | if (request_mem_region(res->start, resource_size(res), | |
331 | dev_name(&dev->dev)) == NULL) { | |
332 | ret = -EBUSY; | |
333 | goto out; | |
334 | } | |
2ec1d359 AR |
335 | |
336 | nmk_chip = kzalloc(sizeof(*nmk_chip), GFP_KERNEL); | |
337 | if (!nmk_chip) { | |
338 | ret = -ENOMEM; | |
3e3c62ca | 339 | goto out_release; |
2ec1d359 AR |
340 | } |
341 | /* | |
342 | * The virt address in nmk_chip->addr is in the nomadik register space, | |
343 | * so we can simply convert the resource address, without remapping | |
344 | */ | |
3e3c62ca | 345 | nmk_chip->addr = io_p2v(res->start); |
2ec1d359 | 346 | nmk_chip->chip = nmk_gpio_template; |
3e3c62ca | 347 | nmk_chip->parent_irq = irq; |
c0fcb8db | 348 | spin_lock_init(&nmk_chip->lock); |
2ec1d359 AR |
349 | |
350 | chip = &nmk_chip->chip; | |
351 | chip->base = pdata->first_gpio; | |
352 | chip->label = pdata->name; | |
353 | chip->dev = &dev->dev; | |
354 | chip->owner = THIS_MODULE; | |
355 | ||
356 | ret = gpiochip_add(&nmk_chip->chip); | |
357 | if (ret) | |
358 | goto out_free; | |
359 | ||
3e3c62ca | 360 | platform_set_drvdata(dev, nmk_chip); |
2ec1d359 AR |
361 | |
362 | nmk_gpio_init_irq(nmk_chip); | |
363 | ||
364 | dev_info(&dev->dev, "Bits %i-%i at address %p\n", | |
365 | nmk_chip->chip.base, nmk_chip->chip.base+31, nmk_chip->addr); | |
366 | return 0; | |
367 | ||
3e3c62ca | 368 | out_free: |
2ec1d359 | 369 | kfree(nmk_chip); |
3e3c62ca RV |
370 | out_release: |
371 | release_mem_region(res->start, resource_size(res)); | |
372 | out: | |
2ec1d359 AR |
373 | dev_err(&dev->dev, "Failure %i for GPIO %i-%i\n", ret, |
374 | pdata->first_gpio, pdata->first_gpio+31); | |
375 | return ret; | |
376 | } | |
377 | ||
3e3c62ca | 378 | static int __exit nmk_gpio_remove(struct platform_device *dev) |
2ec1d359 AR |
379 | { |
380 | struct nmk_gpio_chip *nmk_chip; | |
3e3c62ca RV |
381 | struct resource *res; |
382 | ||
383 | res = platform_get_resource(dev, IORESOURCE_MEM, 0); | |
2ec1d359 | 384 | |
3e3c62ca | 385 | nmk_chip = platform_get_drvdata(dev); |
2ec1d359 AR |
386 | gpiochip_remove(&nmk_chip->chip); |
387 | kfree(nmk_chip); | |
3e3c62ca | 388 | release_mem_region(res->start, resource_size(res)); |
2ec1d359 AR |
389 | return 0; |
390 | } | |
391 | ||
392 | ||
3e3c62ca RV |
393 | static struct platform_driver nmk_gpio_driver = { |
394 | .driver = { | |
2ec1d359 AR |
395 | .owner = THIS_MODULE, |
396 | .name = "gpio", | |
397 | }, | |
398 | .probe = nmk_gpio_probe, | |
3e3c62ca | 399 | .remove = __exit_p(nmk_gpio_remove), |
2ec1d359 AR |
400 | .suspend = NULL, /* to be done */ |
401 | .resume = NULL, | |
2ec1d359 AR |
402 | }; |
403 | ||
404 | static int __init nmk_gpio_init(void) | |
405 | { | |
3e3c62ca | 406 | return platform_driver_register(&nmk_gpio_driver); |
2ec1d359 AR |
407 | } |
408 | ||
409 | arch_initcall(nmk_gpio_init); | |
410 | ||
411 | MODULE_AUTHOR("Prafulla WADASKAR and Alessandro Rubini"); | |
412 | MODULE_DESCRIPTION("Nomadik GPIO Driver"); | |
413 | MODULE_LICENSE("GPL"); | |
414 | ||
415 |