Root/drivers/gpio/gpio-em.c

1/*
2 * Emma Mobile GPIO Support - GIO
3 *
4 * Copyright (C) 2012 Magnus Damm
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20#include <linux/init.h>
21#include <linux/platform_device.h>
22#include <linux/spinlock.h>
23#include <linux/interrupt.h>
24#include <linux/ioport.h>
25#include <linux/io.h>
26#include <linux/irq.h>
27#include <linux/irqdomain.h>
28#include <linux/bitops.h>
29#include <linux/err.h>
30#include <linux/gpio.h>
31#include <linux/slab.h>
32#include <linux/module.h>
33#include <linux/platform_data/gpio-em.h>
34
35struct em_gio_priv {
36    void __iomem *base0;
37    void __iomem *base1;
38    unsigned int irq_base;
39    spinlock_t sense_lock;
40    struct platform_device *pdev;
41    struct gpio_chip gpio_chip;
42    struct irq_chip irq_chip;
43    struct irq_domain *irq_domain;
44};
45
46#define GIO_E1 0x00
47#define GIO_E0 0x04
48#define GIO_EM 0x04
49#define GIO_OL 0x08
50#define GIO_OH 0x0c
51#define GIO_I 0x10
52#define GIO_IIA 0x14
53#define GIO_IEN 0x18
54#define GIO_IDS 0x1c
55#define GIO_IIM 0x1c
56#define GIO_RAW 0x20
57#define GIO_MST 0x24
58#define GIO_IIR 0x28
59
60#define GIO_IDT0 0x40
61#define GIO_IDT1 0x44
62#define GIO_IDT2 0x48
63#define GIO_IDT3 0x4c
64#define GIO_RAWBL 0x50
65#define GIO_RAWBH 0x54
66#define GIO_IRBL 0x58
67#define GIO_IRBH 0x5c
68
69#define GIO_IDT(n) (GIO_IDT0 + ((n) * 4))
70
71static inline unsigned long em_gio_read(struct em_gio_priv *p, int offs)
72{
73    if (offs < GIO_IDT0)
74        return ioread32(p->base0 + offs);
75    else
76        return ioread32(p->base1 + (offs - GIO_IDT0));
77}
78
79static inline void em_gio_write(struct em_gio_priv *p, int offs,
80                unsigned long value)
81{
82    if (offs < GIO_IDT0)
83        iowrite32(value, p->base0 + offs);
84    else
85        iowrite32(value, p->base1 + (offs - GIO_IDT0));
86}
87
88static inline struct em_gio_priv *irq_to_priv(struct irq_data *d)
89{
90    struct irq_chip *chip = irq_data_get_irq_chip(d);
91    return container_of(chip, struct em_gio_priv, irq_chip);
92}
93
94static void em_gio_irq_disable(struct irq_data *d)
95{
96    struct em_gio_priv *p = irq_to_priv(d);
97
98    em_gio_write(p, GIO_IDS, BIT(irqd_to_hwirq(d)));
99}
100
101static void em_gio_irq_enable(struct irq_data *d)
102{
103    struct em_gio_priv *p = irq_to_priv(d);
104
105    em_gio_write(p, GIO_IEN, BIT(irqd_to_hwirq(d)));
106}
107
108#define GIO_ASYNC(x) (x + 8)
109
110static unsigned char em_gio_sense_table[IRQ_TYPE_SENSE_MASK + 1] = {
111    [IRQ_TYPE_EDGE_RISING] = GIO_ASYNC(0x00),
112    [IRQ_TYPE_EDGE_FALLING] = GIO_ASYNC(0x01),
113    [IRQ_TYPE_LEVEL_HIGH] = GIO_ASYNC(0x02),
114    [IRQ_TYPE_LEVEL_LOW] = GIO_ASYNC(0x03),
115    [IRQ_TYPE_EDGE_BOTH] = GIO_ASYNC(0x04),
116};
117
118static int em_gio_irq_set_type(struct irq_data *d, unsigned int type)
119{
120    unsigned char value = em_gio_sense_table[type & IRQ_TYPE_SENSE_MASK];
121    struct em_gio_priv *p = irq_to_priv(d);
122    unsigned int reg, offset, shift;
123    unsigned long flags;
124    unsigned long tmp;
125
126    if (!value)
127        return -EINVAL;
128
129    offset = irqd_to_hwirq(d);
130
131    pr_debug("gio: sense irq = %d, mode = %d\n", offset, value);
132
133    /* 8 x 4 bit fields in 4 IDT registers */
134    reg = GIO_IDT(offset >> 3);
135    shift = (offset & 0x07) << 4;
136
137    spin_lock_irqsave(&p->sense_lock, flags);
138
139    /* disable the interrupt in IIA */
140    tmp = em_gio_read(p, GIO_IIA);
141    tmp &= ~BIT(offset);
142    em_gio_write(p, GIO_IIA, tmp);
143
144    /* change the sense setting in IDT */
145    tmp = em_gio_read(p, reg);
146    tmp &= ~(0xf << shift);
147    tmp |= value << shift;
148    em_gio_write(p, reg, tmp);
149
150    /* clear pending interrupts */
151    em_gio_write(p, GIO_IIR, BIT(offset));
152
153    /* enable the interrupt in IIA */
154    tmp = em_gio_read(p, GIO_IIA);
155    tmp |= BIT(offset);
156    em_gio_write(p, GIO_IIA, tmp);
157
158    spin_unlock_irqrestore(&p->sense_lock, flags);
159
160    return 0;
161}
162
163static irqreturn_t em_gio_irq_handler(int irq, void *dev_id)
164{
165    struct em_gio_priv *p = dev_id;
166    unsigned long pending;
167    unsigned int offset, irqs_handled = 0;
168
169    while ((pending = em_gio_read(p, GIO_MST))) {
170        offset = __ffs(pending);
171        em_gio_write(p, GIO_IIR, BIT(offset));
172        generic_handle_irq(irq_find_mapping(p->irq_domain, offset));
173        irqs_handled++;
174    }
175
176    return irqs_handled ? IRQ_HANDLED : IRQ_NONE;
177}
178
179static inline struct em_gio_priv *gpio_to_priv(struct gpio_chip *chip)
180{
181    return container_of(chip, struct em_gio_priv, gpio_chip);
182}
183
184static int em_gio_direction_input(struct gpio_chip *chip, unsigned offset)
185{
186    em_gio_write(gpio_to_priv(chip), GIO_E0, BIT(offset));
187    return 0;
188}
189
190static int em_gio_get(struct gpio_chip *chip, unsigned offset)
191{
192    return (int)(em_gio_read(gpio_to_priv(chip), GIO_I) & BIT(offset));
193}
194
195static void __em_gio_set(struct gpio_chip *chip, unsigned int reg,
196             unsigned shift, int value)
197{
198    /* upper 16 bits contains mask and lower 16 actual value */
199    em_gio_write(gpio_to_priv(chip), reg,
200             (1 << (shift + 16)) | (value << shift));
201}
202
203static void em_gio_set(struct gpio_chip *chip, unsigned offset, int value)
204{
205    /* output is split into two registers */
206    if (offset < 16)
207        __em_gio_set(chip, GIO_OL, offset, value);
208    else
209        __em_gio_set(chip, GIO_OH, offset - 16, value);
210}
211
212static int em_gio_direction_output(struct gpio_chip *chip, unsigned offset,
213                   int value)
214{
215    /* write GPIO value to output before selecting output mode of pin */
216    em_gio_set(chip, offset, value);
217    em_gio_write(gpio_to_priv(chip), GIO_E1, BIT(offset));
218    return 0;
219}
220
221static int em_gio_to_irq(struct gpio_chip *chip, unsigned offset)
222{
223    return irq_find_mapping(gpio_to_priv(chip)->irq_domain, offset);
224}
225
226static int em_gio_irq_domain_map(struct irq_domain *h, unsigned int virq,
227                 irq_hw_number_t hw)
228{
229    struct em_gio_priv *p = h->host_data;
230
231    pr_debug("gio: map hw irq = %d, virq = %d\n", (int)hw, virq);
232
233    irq_set_chip_data(virq, h->host_data);
234    irq_set_chip_and_handler(virq, &p->irq_chip, handle_level_irq);
235    set_irq_flags(virq, IRQF_VALID); /* kill me now */
236    return 0;
237}
238
239static struct irq_domain_ops em_gio_irq_domain_ops = {
240    .map = em_gio_irq_domain_map,
241};
242
243static int __devinit em_gio_irq_domain_init(struct em_gio_priv *p)
244{
245    struct platform_device *pdev = p->pdev;
246    struct gpio_em_config *pdata = pdev->dev.platform_data;
247
248    p->irq_base = irq_alloc_descs(pdata->irq_base, 0,
249                      pdata->number_of_pins, numa_node_id());
250    if (p->irq_base < 0) {
251        dev_err(&pdev->dev, "cannot get irq_desc\n");
252        return p->irq_base;
253    }
254    pr_debug("gio: hw base = %d, nr = %d, sw base = %d\n",
255         pdata->gpio_base, pdata->number_of_pins, p->irq_base);
256
257    p->irq_domain = irq_domain_add_legacy(pdev->dev.of_node,
258                          pdata->number_of_pins,
259                          p->irq_base, 0,
260                          &em_gio_irq_domain_ops, p);
261    if (!p->irq_domain) {
262        irq_free_descs(p->irq_base, pdata->number_of_pins);
263        return -ENXIO;
264    }
265
266    return 0;
267}
268
269static void em_gio_irq_domain_cleanup(struct em_gio_priv *p)
270{
271    struct gpio_em_config *pdata = p->pdev->dev.platform_data;
272
273    irq_free_descs(p->irq_base, pdata->number_of_pins);
274    /* FIXME: irq domain wants to be freed! */
275}
276
277static int __devinit em_gio_probe(struct platform_device *pdev)
278{
279    struct gpio_em_config *pdata = pdev->dev.platform_data;
280    struct em_gio_priv *p;
281    struct resource *io[2], *irq[2];
282    struct gpio_chip *gpio_chip;
283    struct irq_chip *irq_chip;
284    const char *name = dev_name(&pdev->dev);
285    int ret;
286
287    p = kzalloc(sizeof(*p), GFP_KERNEL);
288    if (!p) {
289        dev_err(&pdev->dev, "failed to allocate driver data\n");
290        ret = -ENOMEM;
291        goto err0;
292    }
293
294    p->pdev = pdev;
295    platform_set_drvdata(pdev, p);
296    spin_lock_init(&p->sense_lock);
297
298    io[0] = platform_get_resource(pdev, IORESOURCE_MEM, 0);
299    io[1] = platform_get_resource(pdev, IORESOURCE_MEM, 1);
300    irq[0] = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
301    irq[1] = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
302
303    if (!io[0] || !io[1] || !irq[0] || !irq[1] || !pdata) {
304        dev_err(&pdev->dev, "missing IRQ, IOMEM or configuration\n");
305        ret = -EINVAL;
306        goto err1;
307    }
308
309    p->base0 = ioremap_nocache(io[0]->start, resource_size(io[0]));
310    if (!p->base0) {
311        dev_err(&pdev->dev, "failed to remap low I/O memory\n");
312        ret = -ENXIO;
313        goto err1;
314    }
315
316    p->base1 = ioremap_nocache(io[1]->start, resource_size(io[1]));
317    if (!p->base1) {
318        dev_err(&pdev->dev, "failed to remap high I/O memory\n");
319        ret = -ENXIO;
320        goto err2;
321    }
322
323    gpio_chip = &p->gpio_chip;
324    gpio_chip->direction_input = em_gio_direction_input;
325    gpio_chip->get = em_gio_get;
326    gpio_chip->direction_output = em_gio_direction_output;
327    gpio_chip->set = em_gio_set;
328    gpio_chip->to_irq = em_gio_to_irq;
329    gpio_chip->label = name;
330    gpio_chip->owner = THIS_MODULE;
331    gpio_chip->base = pdata->gpio_base;
332    gpio_chip->ngpio = pdata->number_of_pins;
333
334    irq_chip = &p->irq_chip;
335    irq_chip->name = name;
336    irq_chip->irq_mask = em_gio_irq_disable;
337    irq_chip->irq_unmask = em_gio_irq_enable;
338    irq_chip->irq_enable = em_gio_irq_enable;
339    irq_chip->irq_disable = em_gio_irq_disable;
340    irq_chip->irq_set_type = em_gio_irq_set_type;
341    irq_chip->flags = IRQCHIP_SKIP_SET_WAKE;
342
343    ret = em_gio_irq_domain_init(p);
344    if (ret) {
345        dev_err(&pdev->dev, "cannot initialize irq domain\n");
346        goto err3;
347    }
348
349    if (request_irq(irq[0]->start, em_gio_irq_handler, 0, name, p)) {
350        dev_err(&pdev->dev, "failed to request low IRQ\n");
351        ret = -ENOENT;
352        goto err4;
353    }
354
355    if (request_irq(irq[1]->start, em_gio_irq_handler, 0, name, p)) {
356        dev_err(&pdev->dev, "failed to request high IRQ\n");
357        ret = -ENOENT;
358        goto err5;
359    }
360
361    ret = gpiochip_add(gpio_chip);
362    if (ret) {
363        dev_err(&pdev->dev, "failed to add GPIO controller\n");
364        goto err6;
365    }
366    return 0;
367
368err6:
369    free_irq(irq[1]->start, pdev);
370err5:
371    free_irq(irq[0]->start, pdev);
372err4:
373    em_gio_irq_domain_cleanup(p);
374err3:
375    iounmap(p->base1);
376err2:
377    iounmap(p->base0);
378err1:
379    kfree(p);
380err0:
381    return ret;
382}
383
384static int __devexit em_gio_remove(struct platform_device *pdev)
385{
386    struct em_gio_priv *p = platform_get_drvdata(pdev);
387    struct resource *irq[2];
388    int ret;
389
390    ret = gpiochip_remove(&p->gpio_chip);
391    if (ret)
392        return ret;
393
394    irq[0] = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
395    irq[1] = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
396
397    free_irq(irq[1]->start, pdev);
398    free_irq(irq[0]->start, pdev);
399    em_gio_irq_domain_cleanup(p);
400    iounmap(p->base1);
401    iounmap(p->base0);
402    kfree(p);
403    return 0;
404}
405
406static struct platform_driver em_gio_device_driver = {
407    .probe = em_gio_probe,
408    .remove = __devexit_p(em_gio_remove),
409    .driver = {
410        .name = "em_gio",
411    }
412};
413
414module_platform_driver(em_gio_device_driver);
415
416MODULE_AUTHOR("Magnus Damm");
417MODULE_DESCRIPTION("Renesas Emma Mobile GIO Driver");
418MODULE_LICENSE("GPL v2");
419

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