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Alessandro Rubini2ec1d352009-07-02 15:29:12 +01001/*
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>
Rabin Vincent3e3c62c2010-03-03 04:52:34 +010016#include <linux/platform_device.h>
Alessandro Rubini2ec1d352009-07-02 15:29:12 +010017#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
35struct nmk_gpio_chip {
36 struct gpio_chip chip;
37 void __iomem *addr;
38 unsigned int parent_irq;
Rabin Vincentc0fcb8d2010-03-03 04:48:54 +010039 spinlock_t lock;
Alessandro Rubini2ec1d352009-07-02 15:29:12 +010040 /* Keep track of configured edges */
41 u32 edge_rising;
42 u32 edge_falling;
43};
44
45/* Mode functions */
46int 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}
71EXPORT_SYMBOL(nmk_gpio_set_mode);
72
73int 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}
89EXPORT_SYMBOL(nmk_gpio_get_mode);
90
91
92/* IRQ functions */
93static inline int nmk_gpio_get_bitmask(int gpio)
94{
95 return 1 << (gpio % 32);
96}
97
98static 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
Rabin Vincent040e5ec2010-05-06 10:42:42 +0100110static void __nmk_gpio_irq_modify(struct nmk_gpio_chip *nmk_chip,
111 int gpio, bool enable)
112{
113 u32 bitmask = nmk_gpio_get_bitmask(gpio);
114 u32 reg;
115
116 /* we must individually set/clear the two edges */
117 if (nmk_chip->edge_rising & bitmask) {
118 reg = readl(nmk_chip->addr + NMK_GPIO_RIMSC);
119 if (enable)
120 reg |= bitmask;
121 else
122 reg &= ~bitmask;
123 writel(reg, nmk_chip->addr + NMK_GPIO_RIMSC);
124 }
125 if (nmk_chip->edge_falling & bitmask) {
126 reg = readl(nmk_chip->addr + NMK_GPIO_FIMSC);
127 if (enable)
128 reg |= bitmask;
129 else
130 reg &= ~bitmask;
131 writel(reg, nmk_chip->addr + NMK_GPIO_FIMSC);
132 }
133}
134
135static void nmk_gpio_irq_modify(unsigned int irq, bool enable)
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100136{
137 int gpio;
138 struct nmk_gpio_chip *nmk_chip;
139 unsigned long flags;
Rabin Vincent040e5ec2010-05-06 10:42:42 +0100140 u32 bitmask;
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100141
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
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100148 spin_lock_irqsave(&nmk_chip->lock, flags);
Rabin Vincent040e5ec2010-05-06 10:42:42 +0100149 __nmk_gpio_irq_modify(nmk_chip, gpio, enable);
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100150 spin_unlock_irqrestore(&nmk_chip->lock, flags);
Rabin Vincent040e5ec2010-05-06 10:42:42 +0100151}
152
153static void nmk_gpio_irq_mask(unsigned int irq)
154{
155 nmk_gpio_irq_modify(irq, false);
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100156};
157
158static void nmk_gpio_irq_unmask(unsigned int irq)
159{
Rabin Vincent040e5ec2010-05-06 10:42:42 +0100160 nmk_gpio_irq_modify(irq, true);
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100161}
162
163static int nmk_gpio_irq_set_type(unsigned int irq, unsigned int type)
164{
Rabin Vincent7a852d82010-05-06 10:43:55 +0100165 bool enabled = !(irq_to_desc(irq)->status & IRQ_DISABLED);
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100166 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
Rabin Vincent7a852d82010-05-06 10:43:55 +0100184 if (enabled)
185 __nmk_gpio_irq_modify(nmk_chip, gpio, false);
186
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100187 nmk_chip->edge_rising &= ~bitmask;
188 if (type & IRQ_TYPE_EDGE_RISING)
189 nmk_chip->edge_rising |= bitmask;
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100190
191 nmk_chip->edge_falling &= ~bitmask;
192 if (type & IRQ_TYPE_EDGE_FALLING)
193 nmk_chip->edge_falling |= bitmask;
Rabin Vincent7a852d82010-05-06 10:43:55 +0100194
195 if (enabled)
196 __nmk_gpio_irq_modify(nmk_chip, gpio, true);
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100197
198 spin_unlock_irqrestore(&nmk_chip->lock, flags);
199
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100200 return 0;
201}
202
203static 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
211static void nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
212{
213 struct nmk_gpio_chip *nmk_chip;
Rabin Vincentaaedaa22010-03-03 04:50:27 +0100214 struct irq_chip *host_chip = get_irq_chip(irq);
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100215 unsigned int gpio_irq;
216 u32 pending;
217 unsigned int first_irq;
218
Rabin Vincentaaedaa22010-03-03 04:50:27 +0100219 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
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100227 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 }
Rabin Vincentaaedaa22010-03-03 04:50:27 +0100233
234 host_chip->unmask(irq);
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100235}
236
237static 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 */
255static 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
264static 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
274static 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
283static 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 */
297static 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
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100306static int __init nmk_gpio_probe(struct platform_device *dev)
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100307{
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100308 struct nmk_gpio_platform_data *pdata = dev->dev.platform_data;
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100309 struct nmk_gpio_chip *nmk_chip;
310 struct gpio_chip *chip;
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100311 struct resource *res;
312 int irq;
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100313 int ret;
314
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100315 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 }
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100335
336 nmk_chip = kzalloc(sizeof(*nmk_chip), GFP_KERNEL);
337 if (!nmk_chip) {
338 ret = -ENOMEM;
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100339 goto out_release;
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100340 }
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 */
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100345 nmk_chip->addr = io_p2v(res->start);
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100346 nmk_chip->chip = nmk_gpio_template;
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100347 nmk_chip->parent_irq = irq;
Rabin Vincentc0fcb8d2010-03-03 04:48:54 +0100348 spin_lock_init(&nmk_chip->lock);
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100349
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
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100360 platform_set_drvdata(dev, nmk_chip);
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100361
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
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100368out_free:
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100369 kfree(nmk_chip);
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100370out_release:
371 release_mem_region(res->start, resource_size(res));
372out:
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100373 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
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100378static int __exit nmk_gpio_remove(struct platform_device *dev)
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100379{
380 struct nmk_gpio_chip *nmk_chip;
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100381 struct resource *res;
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100382
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100383 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
384
385 nmk_chip = platform_get_drvdata(dev);
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100386 gpiochip_remove(&nmk_chip->chip);
387 kfree(nmk_chip);
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100388 release_mem_region(res->start, resource_size(res));
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100389 return 0;
390}
391
392
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100393static struct platform_driver nmk_gpio_driver = {
394 .driver = {
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100395 .owner = THIS_MODULE,
396 .name = "gpio",
397 },
398 .probe = nmk_gpio_probe,
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100399 .remove = __exit_p(nmk_gpio_remove),
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100400 .suspend = NULL, /* to be done */
401 .resume = NULL,
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100402};
403
404static int __init nmk_gpio_init(void)
405{
Rabin Vincent3e3c62c2010-03-03 04:52:34 +0100406 return platform_driver_register(&nmk_gpio_driver);
Alessandro Rubini2ec1d352009-07-02 15:29:12 +0100407}
408
409arch_initcall(nmk_gpio_init);
410
411MODULE_AUTHOR("Prafulla WADASKAR and Alessandro Rubini");
412MODULE_DESCRIPTION("Nomadik GPIO Driver");
413MODULE_LICENSE("GPL");
414
415