Root/drivers/gpio/gpio-tc3589x.c

1/*
2 * Copyright (C) ST-Ericsson SA 2010
3 *
4 * License Terms: GNU General Public License, version 2
5 * Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson
6 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
7 */
8
9#include <linux/module.h>
10#include <linux/init.h>
11#include <linux/platform_device.h>
12#include <linux/slab.h>
13#include <linux/gpio.h>
14#include <linux/irq.h>
15#include <linux/interrupt.h>
16#include <linux/mfd/tc3589x.h>
17
18/*
19 * These registers are modified under the irq bus lock and cached to avoid
20 * unnecessary writes in bus_sync_unlock.
21 */
22enum { REG_IBE, REG_IEV, REG_IS, REG_IE };
23
24#define CACHE_NR_REGS 4
25#define CACHE_NR_BANKS 3
26
27struct tc3589x_gpio {
28    struct gpio_chip chip;
29    struct tc3589x *tc3589x;
30    struct device *dev;
31    struct mutex irq_lock;
32
33    int irq_base;
34
35    /* Caches of interrupt control registers for bus_lock */
36    u8 regs[CACHE_NR_REGS][CACHE_NR_BANKS];
37    u8 oldregs[CACHE_NR_REGS][CACHE_NR_BANKS];
38};
39
40static inline struct tc3589x_gpio *to_tc3589x_gpio(struct gpio_chip *chip)
41{
42    return container_of(chip, struct tc3589x_gpio, chip);
43}
44
45static int tc3589x_gpio_get(struct gpio_chip *chip, unsigned offset)
46{
47    struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
48    struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
49    u8 reg = TC3589x_GPIODATA0 + (offset / 8) * 2;
50    u8 mask = 1 << (offset % 8);
51    int ret;
52
53    ret = tc3589x_reg_read(tc3589x, reg);
54    if (ret < 0)
55        return ret;
56
57    return ret & mask;
58}
59
60static void tc3589x_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
61{
62    struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
63    struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
64    u8 reg = TC3589x_GPIODATA0 + (offset / 8) * 2;
65    unsigned pos = offset % 8;
66    u8 data[] = {!!val << pos, 1 << pos};
67
68    tc3589x_block_write(tc3589x, reg, ARRAY_SIZE(data), data);
69}
70
71static int tc3589x_gpio_direction_output(struct gpio_chip *chip,
72                     unsigned offset, int val)
73{
74    struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
75    struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
76    u8 reg = TC3589x_GPIODIR0 + offset / 8;
77    unsigned pos = offset % 8;
78
79    tc3589x_gpio_set(chip, offset, val);
80
81    return tc3589x_set_bits(tc3589x, reg, 1 << pos, 1 << pos);
82}
83
84static int tc3589x_gpio_direction_input(struct gpio_chip *chip,
85                    unsigned offset)
86{
87    struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
88    struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
89    u8 reg = TC3589x_GPIODIR0 + offset / 8;
90    unsigned pos = offset % 8;
91
92    return tc3589x_set_bits(tc3589x, reg, 1 << pos, 0);
93}
94
95static int tc3589x_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
96{
97    struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
98
99    return tc3589x_gpio->irq_base + offset;
100}
101
102static struct gpio_chip template_chip = {
103    .label = "tc3589x",
104    .owner = THIS_MODULE,
105    .direction_input = tc3589x_gpio_direction_input,
106    .get = tc3589x_gpio_get,
107    .direction_output = tc3589x_gpio_direction_output,
108    .set = tc3589x_gpio_set,
109    .to_irq = tc3589x_gpio_to_irq,
110    .can_sleep = 1,
111};
112
113static int tc3589x_gpio_irq_set_type(struct irq_data *d, unsigned int type)
114{
115    struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
116    int offset = d->irq - tc3589x_gpio->irq_base;
117    int regoffset = offset / 8;
118    int mask = 1 << (offset % 8);
119
120    if (type == IRQ_TYPE_EDGE_BOTH) {
121        tc3589x_gpio->regs[REG_IBE][regoffset] |= mask;
122        return 0;
123    }
124
125    tc3589x_gpio->regs[REG_IBE][regoffset] &= ~mask;
126
127    if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_LEVEL_HIGH)
128        tc3589x_gpio->regs[REG_IS][regoffset] |= mask;
129    else
130        tc3589x_gpio->regs[REG_IS][regoffset] &= ~mask;
131
132    if (type == IRQ_TYPE_EDGE_RISING || type == IRQ_TYPE_LEVEL_HIGH)
133        tc3589x_gpio->regs[REG_IEV][regoffset] |= mask;
134    else
135        tc3589x_gpio->regs[REG_IEV][regoffset] &= ~mask;
136
137    return 0;
138}
139
140static void tc3589x_gpio_irq_lock(struct irq_data *d)
141{
142    struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
143
144    mutex_lock(&tc3589x_gpio->irq_lock);
145}
146
147static void tc3589x_gpio_irq_sync_unlock(struct irq_data *d)
148{
149    struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
150    struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
151    static const u8 regmap[] = {
152        [REG_IBE] = TC3589x_GPIOIBE0,
153        [REG_IEV] = TC3589x_GPIOIEV0,
154        [REG_IS] = TC3589x_GPIOIS0,
155        [REG_IE] = TC3589x_GPIOIE0,
156    };
157    int i, j;
158
159    for (i = 0; i < CACHE_NR_REGS; i++) {
160        for (j = 0; j < CACHE_NR_BANKS; j++) {
161            u8 old = tc3589x_gpio->oldregs[i][j];
162            u8 new = tc3589x_gpio->regs[i][j];
163
164            if (new == old)
165                continue;
166
167            tc3589x_gpio->oldregs[i][j] = new;
168            tc3589x_reg_write(tc3589x, regmap[i] + j * 8, new);
169        }
170    }
171
172    mutex_unlock(&tc3589x_gpio->irq_lock);
173}
174
175static void tc3589x_gpio_irq_mask(struct irq_data *d)
176{
177    struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
178    int offset = d->irq - tc3589x_gpio->irq_base;
179    int regoffset = offset / 8;
180    int mask = 1 << (offset % 8);
181
182    tc3589x_gpio->regs[REG_IE][regoffset] &= ~mask;
183}
184
185static void tc3589x_gpio_irq_unmask(struct irq_data *d)
186{
187    struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
188    int offset = d->irq - tc3589x_gpio->irq_base;
189    int regoffset = offset / 8;
190    int mask = 1 << (offset % 8);
191
192    tc3589x_gpio->regs[REG_IE][regoffset] |= mask;
193}
194
195static struct irq_chip tc3589x_gpio_irq_chip = {
196    .name = "tc3589x-gpio",
197    .irq_bus_lock = tc3589x_gpio_irq_lock,
198    .irq_bus_sync_unlock = tc3589x_gpio_irq_sync_unlock,
199    .irq_mask = tc3589x_gpio_irq_mask,
200    .irq_unmask = tc3589x_gpio_irq_unmask,
201    .irq_set_type = tc3589x_gpio_irq_set_type,
202};
203
204static irqreturn_t tc3589x_gpio_irq(int irq, void *dev)
205{
206    struct tc3589x_gpio *tc3589x_gpio = dev;
207    struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
208    u8 status[CACHE_NR_BANKS];
209    int ret;
210    int i;
211
212    ret = tc3589x_block_read(tc3589x, TC3589x_GPIOMIS0,
213                 ARRAY_SIZE(status), status);
214    if (ret < 0)
215        return IRQ_NONE;
216
217    for (i = 0; i < ARRAY_SIZE(status); i++) {
218        unsigned int stat = status[i];
219        if (!stat)
220            continue;
221
222        while (stat) {
223            int bit = __ffs(stat);
224            int line = i * 8 + bit;
225
226            handle_nested_irq(tc3589x_gpio->irq_base + line);
227            stat &= ~(1 << bit);
228        }
229
230        tc3589x_reg_write(tc3589x, TC3589x_GPIOIC0 + i, status[i]);
231    }
232
233    return IRQ_HANDLED;
234}
235
236static int tc3589x_gpio_irq_init(struct tc3589x_gpio *tc3589x_gpio)
237{
238    int base = tc3589x_gpio->irq_base;
239    int irq;
240
241    for (irq = base; irq < base + tc3589x_gpio->chip.ngpio; irq++) {
242        irq_set_chip_data(irq, tc3589x_gpio);
243        irq_set_chip_and_handler(irq, &tc3589x_gpio_irq_chip,
244                     handle_simple_irq);
245        irq_set_nested_thread(irq, 1);
246#ifdef CONFIG_ARM
247        set_irq_flags(irq, IRQF_VALID);
248#else
249        irq_set_noprobe(irq);
250#endif
251    }
252
253    return 0;
254}
255
256static void tc3589x_gpio_irq_remove(struct tc3589x_gpio *tc3589x_gpio)
257{
258    int base = tc3589x_gpio->irq_base;
259    int irq;
260
261    for (irq = base; irq < base + tc3589x_gpio->chip.ngpio; irq++) {
262#ifdef CONFIG_ARM
263        set_irq_flags(irq, 0);
264#endif
265        irq_set_chip_and_handler(irq, NULL, NULL);
266        irq_set_chip_data(irq, NULL);
267    }
268}
269
270static int __devinit tc3589x_gpio_probe(struct platform_device *pdev)
271{
272    struct tc3589x *tc3589x = dev_get_drvdata(pdev->dev.parent);
273    struct tc3589x_gpio_platform_data *pdata;
274    struct tc3589x_gpio *tc3589x_gpio;
275    int ret;
276    int irq;
277
278    pdata = tc3589x->pdata->gpio;
279    if (!pdata)
280        return -ENODEV;
281
282    irq = platform_get_irq(pdev, 0);
283    if (irq < 0)
284        return irq;
285
286    tc3589x_gpio = kzalloc(sizeof(struct tc3589x_gpio), GFP_KERNEL);
287    if (!tc3589x_gpio)
288        return -ENOMEM;
289
290    mutex_init(&tc3589x_gpio->irq_lock);
291
292    tc3589x_gpio->dev = &pdev->dev;
293    tc3589x_gpio->tc3589x = tc3589x;
294
295    tc3589x_gpio->chip = template_chip;
296    tc3589x_gpio->chip.ngpio = tc3589x->num_gpio;
297    tc3589x_gpio->chip.dev = &pdev->dev;
298    tc3589x_gpio->chip.base = pdata->gpio_base;
299
300    tc3589x_gpio->irq_base = tc3589x->irq_base + TC3589x_INT_GPIO(0);
301
302    /* Bring the GPIO module out of reset */
303    ret = tc3589x_set_bits(tc3589x, TC3589x_RSTCTRL,
304                   TC3589x_RSTCTRL_GPIRST, 0);
305    if (ret < 0)
306        goto out_free;
307
308    ret = tc3589x_gpio_irq_init(tc3589x_gpio);
309    if (ret)
310        goto out_free;
311
312    ret = request_threaded_irq(irq, NULL, tc3589x_gpio_irq, IRQF_ONESHOT,
313                   "tc3589x-gpio", tc3589x_gpio);
314    if (ret) {
315        dev_err(&pdev->dev, "unable to get irq: %d\n", ret);
316        goto out_removeirq;
317    }
318
319    ret = gpiochip_add(&tc3589x_gpio->chip);
320    if (ret) {
321        dev_err(&pdev->dev, "unable to add gpiochip: %d\n", ret);
322        goto out_freeirq;
323    }
324
325    if (pdata->setup)
326        pdata->setup(tc3589x, tc3589x_gpio->chip.base);
327
328    platform_set_drvdata(pdev, tc3589x_gpio);
329
330    return 0;
331
332out_freeirq:
333    free_irq(irq, tc3589x_gpio);
334out_removeirq:
335    tc3589x_gpio_irq_remove(tc3589x_gpio);
336out_free:
337    kfree(tc3589x_gpio);
338    return ret;
339}
340
341static int __devexit tc3589x_gpio_remove(struct platform_device *pdev)
342{
343    struct tc3589x_gpio *tc3589x_gpio = platform_get_drvdata(pdev);
344    struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
345    struct tc3589x_gpio_platform_data *pdata = tc3589x->pdata->gpio;
346    int irq = platform_get_irq(pdev, 0);
347    int ret;
348
349    if (pdata->remove)
350        pdata->remove(tc3589x, tc3589x_gpio->chip.base);
351
352    ret = gpiochip_remove(&tc3589x_gpio->chip);
353    if (ret < 0) {
354        dev_err(tc3589x_gpio->dev,
355            "unable to remove gpiochip: %d\n", ret);
356        return ret;
357    }
358
359    free_irq(irq, tc3589x_gpio);
360    tc3589x_gpio_irq_remove(tc3589x_gpio);
361
362    platform_set_drvdata(pdev, NULL);
363    kfree(tc3589x_gpio);
364
365    return 0;
366}
367
368static struct platform_driver tc3589x_gpio_driver = {
369    .driver.name = "tc3589x-gpio",
370    .driver.owner = THIS_MODULE,
371    .probe = tc3589x_gpio_probe,
372    .remove = __devexit_p(tc3589x_gpio_remove),
373};
374
375static int __init tc3589x_gpio_init(void)
376{
377    return platform_driver_register(&tc3589x_gpio_driver);
378}
379subsys_initcall(tc3589x_gpio_init);
380
381static void __exit tc3589x_gpio_exit(void)
382{
383    platform_driver_unregister(&tc3589x_gpio_driver);
384}
385module_exit(tc3589x_gpio_exit);
386
387MODULE_LICENSE("GPL v2");
388MODULE_DESCRIPTION("TC3589x GPIO driver");
389MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");
390

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