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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> | |
16 | #include <linux/amba/bus.h> | |
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> | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
2ec1d359 AR |
23 | |
24 | #include <mach/hardware.h> | |
25 | #include <mach/gpio.h> | |
26 | ||
27 | /* | |
28 | * The GPIO module in the Nomadik family of Systems-on-Chip is an | |
29 | * AMBA device, managing 32 pins and alternate functions. The logic block | |
30 | * is currently only used in the Nomadik. | |
31 | * | |
32 | * Symbols in this file are called "nmk_gpio" for "nomadik gpio" | |
33 | */ | |
34 | ||
35 | #define NMK_GPIO_PER_CHIP 32 | |
36 | struct nmk_gpio_chip { | |
37 | struct gpio_chip chip; | |
38 | void __iomem *addr; | |
39 | unsigned int parent_irq; | |
40 | spinlock_t *lock; | |
41 | /* Keep track of configured edges */ | |
42 | u32 edge_rising; | |
43 | u32 edge_falling; | |
44 | }; | |
45 | ||
46 | /* Mode functions */ | |
47 | int nmk_gpio_set_mode(int gpio, int gpio_mode) | |
48 | { | |
49 | struct nmk_gpio_chip *nmk_chip; | |
50 | unsigned long flags; | |
51 | u32 afunc, bfunc, bit; | |
52 | ||
53 | nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio)); | |
54 | if (!nmk_chip) | |
55 | return -EINVAL; | |
56 | ||
57 | bit = 1 << (gpio - nmk_chip->chip.base); | |
58 | ||
59 | spin_lock_irqsave(&nmk_chip->lock, flags); | |
60 | afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & ~bit; | |
61 | bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & ~bit; | |
62 | if (gpio_mode & NMK_GPIO_ALT_A) | |
63 | afunc |= bit; | |
64 | if (gpio_mode & NMK_GPIO_ALT_B) | |
65 | bfunc |= bit; | |
66 | writel(afunc, nmk_chip->addr + NMK_GPIO_AFSLA); | |
67 | writel(bfunc, nmk_chip->addr + NMK_GPIO_AFSLB); | |
68 | spin_unlock_irqrestore(&nmk_chip->lock, flags); | |
69 | ||
70 | return 0; | |
71 | } | |
72 | EXPORT_SYMBOL(nmk_gpio_set_mode); | |
73 | ||
74 | int nmk_gpio_get_mode(int gpio) | |
75 | { | |
76 | struct nmk_gpio_chip *nmk_chip; | |
77 | u32 afunc, bfunc, bit; | |
78 | ||
79 | nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio)); | |
80 | if (!nmk_chip) | |
81 | return -EINVAL; | |
82 | ||
83 | bit = 1 << (gpio - nmk_chip->chip.base); | |
84 | ||
85 | afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & bit; | |
86 | bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & bit; | |
87 | ||
88 | return (afunc ? NMK_GPIO_ALT_A : 0) | (bfunc ? NMK_GPIO_ALT_B : 0); | |
89 | } | |
90 | EXPORT_SYMBOL(nmk_gpio_get_mode); | |
91 | ||
92 | ||
93 | /* IRQ functions */ | |
94 | static inline int nmk_gpio_get_bitmask(int gpio) | |
95 | { | |
96 | return 1 << (gpio % 32); | |
97 | } | |
98 | ||
99 | static void nmk_gpio_irq_ack(unsigned int irq) | |
100 | { | |
101 | int gpio; | |
102 | struct nmk_gpio_chip *nmk_chip; | |
103 | ||
104 | gpio = NOMADIK_IRQ_TO_GPIO(irq); | |
105 | nmk_chip = get_irq_chip_data(irq); | |
106 | if (!nmk_chip) | |
107 | return; | |
108 | writel(nmk_gpio_get_bitmask(gpio), nmk_chip->addr + NMK_GPIO_IC); | |
109 | } | |
110 | ||
111 | static void nmk_gpio_irq_mask(unsigned int irq) | |
112 | { | |
113 | int gpio; | |
114 | struct nmk_gpio_chip *nmk_chip; | |
115 | unsigned long flags; | |
116 | u32 bitmask, reg; | |
117 | ||
118 | gpio = NOMADIK_IRQ_TO_GPIO(irq); | |
119 | nmk_chip = get_irq_chip_data(irq); | |
120 | bitmask = nmk_gpio_get_bitmask(gpio); | |
121 | if (!nmk_chip) | |
122 | return; | |
123 | ||
124 | /* we must individually clear the two edges */ | |
125 | spin_lock_irqsave(&nmk_chip->lock, flags); | |
126 | if (nmk_chip->edge_rising & bitmask) { | |
127 | reg = readl(nmk_chip->addr + NMK_GPIO_RWIMSC); | |
128 | reg &= ~bitmask; | |
129 | writel(reg, nmk_chip->addr + NMK_GPIO_RWIMSC); | |
130 | } | |
131 | if (nmk_chip->edge_falling & bitmask) { | |
132 | reg = readl(nmk_chip->addr + NMK_GPIO_FWIMSC); | |
133 | reg &= ~bitmask; | |
134 | writel(reg, nmk_chip->addr + NMK_GPIO_FWIMSC); | |
135 | } | |
136 | spin_unlock_irqrestore(&nmk_chip->lock, flags); | |
137 | }; | |
138 | ||
139 | static void nmk_gpio_irq_unmask(unsigned int irq) | |
140 | { | |
141 | int gpio; | |
142 | struct nmk_gpio_chip *nmk_chip; | |
143 | unsigned long flags; | |
144 | u32 bitmask, reg; | |
145 | ||
146 | gpio = NOMADIK_IRQ_TO_GPIO(irq); | |
147 | nmk_chip = get_irq_chip_data(irq); | |
148 | bitmask = nmk_gpio_get_bitmask(gpio); | |
149 | if (!nmk_chip) | |
150 | return; | |
151 | ||
152 | /* we must individually set the two edges */ | |
153 | spin_lock_irqsave(&nmk_chip->lock, flags); | |
154 | if (nmk_chip->edge_rising & bitmask) { | |
155 | reg = readl(nmk_chip->addr + NMK_GPIO_RWIMSC); | |
156 | reg |= bitmask; | |
157 | writel(reg, nmk_chip->addr + NMK_GPIO_RWIMSC); | |
158 | } | |
159 | if (nmk_chip->edge_falling & bitmask) { | |
160 | reg = readl(nmk_chip->addr + NMK_GPIO_FWIMSC); | |
161 | reg |= bitmask; | |
162 | writel(reg, nmk_chip->addr + NMK_GPIO_FWIMSC); | |
163 | } | |
164 | spin_unlock_irqrestore(&nmk_chip->lock, flags); | |
165 | } | |
166 | ||
167 | static int nmk_gpio_irq_set_type(unsigned int irq, unsigned int type) | |
168 | { | |
169 | int gpio; | |
170 | struct nmk_gpio_chip *nmk_chip; | |
171 | unsigned long flags; | |
172 | u32 bitmask; | |
173 | ||
174 | gpio = NOMADIK_IRQ_TO_GPIO(irq); | |
175 | nmk_chip = get_irq_chip_data(irq); | |
176 | bitmask = nmk_gpio_get_bitmask(gpio); | |
177 | if (!nmk_chip) | |
178 | return -EINVAL; | |
179 | ||
180 | if (type & IRQ_TYPE_LEVEL_HIGH) | |
181 | return -EINVAL; | |
182 | if (type & IRQ_TYPE_LEVEL_LOW) | |
183 | return -EINVAL; | |
184 | ||
185 | spin_lock_irqsave(&nmk_chip->lock, flags); | |
186 | ||
187 | nmk_chip->edge_rising &= ~bitmask; | |
188 | if (type & IRQ_TYPE_EDGE_RISING) | |
189 | nmk_chip->edge_rising |= bitmask; | |
190 | writel(nmk_chip->edge_rising, nmk_chip->addr + NMK_GPIO_RIMSC); | |
191 | ||
192 | nmk_chip->edge_falling &= ~bitmask; | |
193 | if (type & IRQ_TYPE_EDGE_FALLING) | |
194 | nmk_chip->edge_falling |= bitmask; | |
195 | writel(nmk_chip->edge_falling, nmk_chip->addr + NMK_GPIO_FIMSC); | |
196 | ||
197 | spin_unlock_irqrestore(&nmk_chip->lock, flags); | |
198 | ||
199 | nmk_gpio_irq_unmask(irq); | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
204 | static struct irq_chip nmk_gpio_irq_chip = { | |
205 | .name = "Nomadik-GPIO", | |
206 | .ack = nmk_gpio_irq_ack, | |
207 | .mask = nmk_gpio_irq_mask, | |
208 | .unmask = nmk_gpio_irq_unmask, | |
209 | .set_type = nmk_gpio_irq_set_type, | |
210 | }; | |
211 | ||
212 | static void nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc) | |
213 | { | |
214 | struct nmk_gpio_chip *nmk_chip; | |
215 | struct irq_chip *host_chip; | |
216 | unsigned int gpio_irq; | |
217 | u32 pending; | |
218 | unsigned int first_irq; | |
219 | ||
220 | nmk_chip = get_irq_data(irq); | |
221 | first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base); | |
222 | while ( (pending = readl(nmk_chip->addr + NMK_GPIO_IS)) ) { | |
223 | gpio_irq = first_irq + __ffs(pending); | |
224 | generic_handle_irq(gpio_irq); | |
225 | } | |
226 | if (0) {/* don't ack parent irq, as ack == disable */ | |
227 | host_chip = get_irq_chip(irq); | |
228 | host_chip->ack(irq); | |
229 | } | |
230 | } | |
231 | ||
232 | static int nmk_gpio_init_irq(struct nmk_gpio_chip *nmk_chip) | |
233 | { | |
234 | unsigned int first_irq; | |
235 | int i; | |
236 | ||
237 | first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base); | |
238 | for (i = first_irq; i < first_irq + NMK_GPIO_PER_CHIP; i++) { | |
239 | set_irq_chip(i, &nmk_gpio_irq_chip); | |
240 | set_irq_handler(i, handle_edge_irq); | |
241 | set_irq_flags(i, IRQF_VALID); | |
242 | set_irq_chip_data(i, nmk_chip); | |
243 | } | |
244 | set_irq_chained_handler(nmk_chip->parent_irq, nmk_gpio_irq_handler); | |
245 | set_irq_data(nmk_chip->parent_irq, nmk_chip); | |
246 | return 0; | |
247 | } | |
248 | ||
249 | /* I/O Functions */ | |
250 | static int nmk_gpio_make_input(struct gpio_chip *chip, unsigned offset) | |
251 | { | |
252 | struct nmk_gpio_chip *nmk_chip = | |
253 | container_of(chip, struct nmk_gpio_chip, chip); | |
254 | ||
255 | writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC); | |
256 | return 0; | |
257 | } | |
258 | ||
259 | static int nmk_gpio_make_output(struct gpio_chip *chip, unsigned offset, | |
260 | int val) | |
261 | { | |
262 | struct nmk_gpio_chip *nmk_chip = | |
263 | container_of(chip, struct nmk_gpio_chip, chip); | |
264 | ||
265 | writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRS); | |
266 | return 0; | |
267 | } | |
268 | ||
269 | static int nmk_gpio_get_input(struct gpio_chip *chip, unsigned offset) | |
270 | { | |
271 | struct nmk_gpio_chip *nmk_chip = | |
272 | container_of(chip, struct nmk_gpio_chip, chip); | |
273 | u32 bit = 1 << offset; | |
274 | ||
275 | return (readl(nmk_chip->addr + NMK_GPIO_DAT) & bit) != 0; | |
276 | } | |
277 | ||
278 | static void nmk_gpio_set_output(struct gpio_chip *chip, unsigned offset, | |
279 | int val) | |
280 | { | |
281 | struct nmk_gpio_chip *nmk_chip = | |
282 | container_of(chip, struct nmk_gpio_chip, chip); | |
283 | u32 bit = 1 << offset; | |
284 | ||
285 | if (val) | |
286 | writel(bit, nmk_chip->addr + NMK_GPIO_DATS); | |
287 | else | |
288 | writel(bit, nmk_chip->addr + NMK_GPIO_DATC); | |
289 | } | |
290 | ||
291 | /* This structure is replicated for each GPIO block allocated at probe time */ | |
292 | static struct gpio_chip nmk_gpio_template = { | |
293 | .direction_input = nmk_gpio_make_input, | |
294 | .get = nmk_gpio_get_input, | |
295 | .direction_output = nmk_gpio_make_output, | |
296 | .set = nmk_gpio_set_output, | |
297 | .ngpio = NMK_GPIO_PER_CHIP, | |
298 | .can_sleep = 0, | |
299 | }; | |
300 | ||
301 | static int __init nmk_gpio_probe(struct amba_device *dev, struct amba_id *id) | |
302 | { | |
303 | struct nmk_gpio_platform_data *pdata; | |
304 | struct nmk_gpio_chip *nmk_chip; | |
305 | struct gpio_chip *chip; | |
306 | int ret; | |
307 | ||
308 | pdata = dev->dev.platform_data; | |
309 | ret = amba_request_regions(dev, pdata->name); | |
310 | if (ret) | |
311 | return ret; | |
312 | ||
313 | nmk_chip = kzalloc(sizeof(*nmk_chip), GFP_KERNEL); | |
314 | if (!nmk_chip) { | |
315 | ret = -ENOMEM; | |
316 | goto out_amba; | |
317 | } | |
318 | /* | |
319 | * The virt address in nmk_chip->addr is in the nomadik register space, | |
320 | * so we can simply convert the resource address, without remapping | |
321 | */ | |
322 | nmk_chip->addr = io_p2v(dev->res.start); | |
323 | nmk_chip->chip = nmk_gpio_template; | |
324 | nmk_chip->parent_irq = pdata->parent_irq; | |
325 | ||
326 | chip = &nmk_chip->chip; | |
327 | chip->base = pdata->first_gpio; | |
328 | chip->label = pdata->name; | |
329 | chip->dev = &dev->dev; | |
330 | chip->owner = THIS_MODULE; | |
331 | ||
332 | ret = gpiochip_add(&nmk_chip->chip); | |
333 | if (ret) | |
334 | goto out_free; | |
335 | ||
336 | amba_set_drvdata(dev, nmk_chip); | |
337 | ||
338 | nmk_gpio_init_irq(nmk_chip); | |
339 | ||
340 | dev_info(&dev->dev, "Bits %i-%i at address %p\n", | |
341 | nmk_chip->chip.base, nmk_chip->chip.base+31, nmk_chip->addr); | |
342 | return 0; | |
343 | ||
344 | out_free: | |
345 | kfree(nmk_chip); | |
346 | out_amba: | |
347 | amba_release_regions(dev); | |
348 | dev_err(&dev->dev, "Failure %i for GPIO %i-%i\n", ret, | |
349 | pdata->first_gpio, pdata->first_gpio+31); | |
350 | return ret; | |
351 | } | |
352 | ||
353 | static int nmk_gpio_remove(struct amba_device *dev) | |
354 | { | |
355 | struct nmk_gpio_chip *nmk_chip; | |
356 | ||
357 | nmk_chip = amba_get_drvdata(dev); | |
358 | gpiochip_remove(&nmk_chip->chip); | |
359 | kfree(nmk_chip); | |
360 | amba_release_regions(dev); | |
361 | return 0; | |
362 | } | |
363 | ||
364 | ||
365 | /* We have 0x1f080060 and 0x1f180060, accept both using the mask */ | |
366 | static struct amba_id nmk_gpio_ids[] = { | |
367 | { | |
368 | .id = 0x1f080060, | |
369 | .mask = 0xffefffff, | |
370 | }, | |
371 | {0, 0}, | |
372 | }; | |
373 | ||
374 | static struct amba_driver nmk_gpio_driver = { | |
375 | .drv = { | |
376 | .owner = THIS_MODULE, | |
377 | .name = "gpio", | |
378 | }, | |
379 | .probe = nmk_gpio_probe, | |
380 | .remove = nmk_gpio_remove, | |
381 | .suspend = NULL, /* to be done */ | |
382 | .resume = NULL, | |
383 | .id_table = nmk_gpio_ids, | |
384 | }; | |
385 | ||
386 | static int __init nmk_gpio_init(void) | |
387 | { | |
388 | return amba_driver_register(&nmk_gpio_driver); | |
389 | } | |
390 | ||
391 | arch_initcall(nmk_gpio_init); | |
392 | ||
393 | MODULE_AUTHOR("Prafulla WADASKAR and Alessandro Rubini"); | |
394 | MODULE_DESCRIPTION("Nomadik GPIO Driver"); | |
395 | MODULE_LICENSE("GPL"); | |
396 | ||
397 |