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TOMOYO Linux Cross Reference
Linux/arch/arm/mach-nomadik/gpio.c

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  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>
 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;
 39         spinlock_t *lock;
 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 
110 static void nmk_gpio_irq_mask(unsigned int irq)
111 {
112         int gpio;
113         struct nmk_gpio_chip *nmk_chip;
114         unsigned long flags;
115         u32 bitmask, reg;
116 
117         gpio = NOMADIK_IRQ_TO_GPIO(irq);
118         nmk_chip = get_irq_chip_data(irq);
119         bitmask = nmk_gpio_get_bitmask(gpio);
120         if (!nmk_chip)
121                 return;
122 
123         /* we must individually clear the two edges */
124         spin_lock_irqsave(&nmk_chip->lock, flags);
125         if (nmk_chip->edge_rising & bitmask) {
126                 reg = readl(nmk_chip->addr + NMK_GPIO_RWIMSC);
127                 reg &= ~bitmask;
128                 writel(reg, nmk_chip->addr + NMK_GPIO_RWIMSC);
129         }
130         if (nmk_chip->edge_falling & bitmask) {
131                 reg = readl(nmk_chip->addr + NMK_GPIO_FWIMSC);
132                 reg &= ~bitmask;
133                 writel(reg, nmk_chip->addr + NMK_GPIO_FWIMSC);
134         }
135         spin_unlock_irqrestore(&nmk_chip->lock, flags);
136 };
137 
138 static void nmk_gpio_irq_unmask(unsigned int irq)
139 {
140         int gpio;
141         struct nmk_gpio_chip *nmk_chip;
142         unsigned long flags;
143         u32 bitmask, reg;
144 
145         gpio = NOMADIK_IRQ_TO_GPIO(irq);
146         nmk_chip = get_irq_chip_data(irq);
147         bitmask = nmk_gpio_get_bitmask(gpio);
148         if (!nmk_chip)
149                 return;
150 
151         /* we must individually set the two edges */
152         spin_lock_irqsave(&nmk_chip->lock, flags);
153         if (nmk_chip->edge_rising & bitmask) {
154                 reg = readl(nmk_chip->addr + NMK_GPIO_RWIMSC);
155                 reg |= bitmask;
156                 writel(reg, nmk_chip->addr + NMK_GPIO_RWIMSC);
157         }
158         if (nmk_chip->edge_falling & bitmask) {
159                 reg = readl(nmk_chip->addr + NMK_GPIO_FWIMSC);
160                 reg |= bitmask;
161                 writel(reg, nmk_chip->addr + NMK_GPIO_FWIMSC);
162         }
163         spin_unlock_irqrestore(&nmk_chip->lock, flags);
164 }
165 
166 static int nmk_gpio_irq_set_type(unsigned int irq, unsigned int type)
167 {
168         int gpio;
169         struct nmk_gpio_chip *nmk_chip;
170         unsigned long flags;
171         u32 bitmask;
172 
173         gpio = NOMADIK_IRQ_TO_GPIO(irq);
174         nmk_chip = get_irq_chip_data(irq);
175         bitmask = nmk_gpio_get_bitmask(gpio);
176         if (!nmk_chip)
177                 return -EINVAL;
178 
179         if (type & IRQ_TYPE_LEVEL_HIGH)
180                 return -EINVAL;
181         if (type & IRQ_TYPE_LEVEL_LOW)
182                 return -EINVAL;
183 
184         spin_lock_irqsave(&nmk_chip->lock, flags);
185 
186         nmk_chip->edge_rising &= ~bitmask;
187         if (type & IRQ_TYPE_EDGE_RISING)
188                 nmk_chip->edge_rising |= bitmask;
189         writel(nmk_chip->edge_rising, nmk_chip->addr + NMK_GPIO_RIMSC);
190 
191         nmk_chip->edge_falling &= ~bitmask;
192         if (type & IRQ_TYPE_EDGE_FALLING)
193                 nmk_chip->edge_falling |= bitmask;
194         writel(nmk_chip->edge_falling, nmk_chip->addr + NMK_GPIO_FIMSC);
195 
196         spin_unlock_irqrestore(&nmk_chip->lock, flags);
197 
198         nmk_gpio_irq_unmask(irq);
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;
214         struct irq_chip *host_chip;
215         unsigned int gpio_irq;
216         u32 pending;
217         unsigned int first_irq;
218 
219         nmk_chip = get_irq_data(irq);
220         first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base);
221         while ( (pending = readl(nmk_chip->addr + NMK_GPIO_IS)) ) {
222                 gpio_irq = first_irq + __ffs(pending);
223                 generic_handle_irq(gpio_irq);
224         }
225         if (0) {/* don't ack parent irq, as ack == disable */
226                 host_chip = get_irq_chip(irq);
227                 host_chip->ack(irq);
228         }
229 }
230 
231 static int nmk_gpio_init_irq(struct nmk_gpio_chip *nmk_chip)
232 {
233         unsigned int first_irq;
234         int i;
235 
236         first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base);
237         for (i = first_irq; i < first_irq + NMK_GPIO_PER_CHIP; i++) {
238                 set_irq_chip(i, &nmk_gpio_irq_chip);
239                 set_irq_handler(i, handle_edge_irq);
240                 set_irq_flags(i, IRQF_VALID);
241                 set_irq_chip_data(i, nmk_chip);
242         }
243         set_irq_chained_handler(nmk_chip->parent_irq, nmk_gpio_irq_handler);
244         set_irq_data(nmk_chip->parent_irq, nmk_chip);
245         return 0;
246 }
247 
248 /* I/O Functions */
249 static int nmk_gpio_make_input(struct gpio_chip *chip, unsigned offset)
250 {
251         struct nmk_gpio_chip *nmk_chip =
252                 container_of(chip, struct nmk_gpio_chip, chip);
253 
254         writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC);
255         return 0;
256 }
257 
258 static int nmk_gpio_make_output(struct gpio_chip *chip, unsigned offset,
259                                 int val)
260 {
261         struct nmk_gpio_chip *nmk_chip =
262                 container_of(chip, struct nmk_gpio_chip, chip);
263 
264         writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRS);
265         return 0;
266 }
267 
268 static int nmk_gpio_get_input(struct gpio_chip *chip, unsigned offset)
269 {
270         struct nmk_gpio_chip *nmk_chip =
271                 container_of(chip, struct nmk_gpio_chip, chip);
272         u32 bit = 1 << offset;
273 
274         return (readl(nmk_chip->addr + NMK_GPIO_DAT) & bit) != 0;
275 }
276 
277 static void nmk_gpio_set_output(struct gpio_chip *chip, unsigned offset,
278                                 int val)
279 {
280         struct nmk_gpio_chip *nmk_chip =
281                 container_of(chip, struct nmk_gpio_chip, chip);
282         u32 bit = 1 << offset;
283 
284         if (val)
285                 writel(bit, nmk_chip->addr + NMK_GPIO_DATS);
286         else
287                 writel(bit, nmk_chip->addr + NMK_GPIO_DATC);
288 }
289 
290 /* This structure is replicated for each GPIO block allocated at probe time */
291 static struct gpio_chip nmk_gpio_template = {
292         .direction_input        = nmk_gpio_make_input,
293         .get                    = nmk_gpio_get_input,
294         .direction_output       = nmk_gpio_make_output,
295         .set                    = nmk_gpio_set_output,
296         .ngpio                  = NMK_GPIO_PER_CHIP,
297         .can_sleep              = 0,
298 };
299 
300 static int __init nmk_gpio_probe(struct amba_device *dev, struct amba_id *id)
301 {
302         struct nmk_gpio_platform_data *pdata;
303         struct nmk_gpio_chip *nmk_chip;
304         struct gpio_chip *chip;
305         int ret;
306 
307         pdata = dev->dev.platform_data;
308         ret = amba_request_regions(dev, pdata->name);
309         if (ret)
310                 return ret;
311 
312         nmk_chip = kzalloc(sizeof(*nmk_chip), GFP_KERNEL);
313         if (!nmk_chip) {
314                 ret = -ENOMEM;
315                 goto out_amba;
316         }
317         /*
318          * The virt address in nmk_chip->addr is in the nomadik register space,
319          * so we can simply convert the resource address, without remapping
320          */
321         nmk_chip->addr = io_p2v(dev->res.start);
322         nmk_chip->chip = nmk_gpio_template;
323         nmk_chip->parent_irq = pdata->parent_irq;
324 
325         chip = &nmk_chip->chip;
326         chip->base = pdata->first_gpio;
327         chip->label = pdata->name;
328         chip->dev = &dev->dev;
329         chip->owner = THIS_MODULE;
330 
331         ret = gpiochip_add(&nmk_chip->chip);
332         if (ret)
333                 goto out_free;
334 
335         amba_set_drvdata(dev, nmk_chip);
336 
337         nmk_gpio_init_irq(nmk_chip);
338 
339         dev_info(&dev->dev, "Bits %i-%i at address %p\n",
340                  nmk_chip->chip.base, nmk_chip->chip.base+31, nmk_chip->addr);
341         return 0;
342 
343  out_free:
344         kfree(nmk_chip);
345  out_amba:
346         amba_release_regions(dev);
347         dev_err(&dev->dev, "Failure %i for GPIO %i-%i\n", ret,
348                   pdata->first_gpio, pdata->first_gpio+31);
349         return ret;
350 }
351 
352 static int nmk_gpio_remove(struct amba_device *dev)
353 {
354         struct nmk_gpio_chip *nmk_chip;
355 
356         nmk_chip = amba_get_drvdata(dev);
357         gpiochip_remove(&nmk_chip->chip);
358         kfree(nmk_chip);
359         amba_release_regions(dev);
360         return 0;
361 }
362 
363 
364 /* We have 0x1f080060 and 0x1f180060, accept both using the mask */
365 static struct amba_id nmk_gpio_ids[] = {
366         {
367                 .id     = 0x1f080060,
368                 .mask   = 0xffefffff,
369         },
370         {0, 0},
371 };
372 
373 static struct amba_driver nmk_gpio_driver = {
374         .drv = {
375                 .owner = THIS_MODULE,
376                 .name = "gpio",
377                 },
378         .probe = nmk_gpio_probe,
379         .remove = nmk_gpio_remove,
380         .suspend = NULL, /* to be done */
381         .resume = NULL,
382         .id_table = nmk_gpio_ids,
383 };
384 
385 static int __init nmk_gpio_init(void)
386 {
387         return amba_driver_register(&nmk_gpio_driver);
388 }
389 
390 arch_initcall(nmk_gpio_init);
391 
392 MODULE_AUTHOR("Prafulla WADASKAR and Alessandro Rubini");
393 MODULE_DESCRIPTION("Nomadik GPIO Driver");
394 MODULE_LICENSE("GPL");
395 
396 
397 

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