Merge tag 'regulator-v3.14-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git...
[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / mfd / pm8xxx-irq.c
1 /*
2  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2 and
6  * only version 2 as published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11  * GNU General Public License for more details.
12  */
13
14 #define pr_fmt(fmt)     "%s: " fmt, __func__
15
16 #include <linux/err.h>
17 #include <linux/interrupt.h>
18 #include <linux/irq.h>
19 #include <linux/kernel.h>
20 #include <linux/mfd/pm8xxx/core.h>
21 #include <linux/mfd/pm8xxx/irq.h>
22 #include <linux/platform_device.h>
23 #include <linux/slab.h>
24
25 /* PMIC8xxx IRQ */
26
27 #define SSBI_REG_ADDR_IRQ_BASE          0x1BB
28
29 #define SSBI_REG_ADDR_IRQ_ROOT          (SSBI_REG_ADDR_IRQ_BASE + 0)
30 #define SSBI_REG_ADDR_IRQ_M_STATUS1     (SSBI_REG_ADDR_IRQ_BASE + 1)
31 #define SSBI_REG_ADDR_IRQ_M_STATUS2     (SSBI_REG_ADDR_IRQ_BASE + 2)
32 #define SSBI_REG_ADDR_IRQ_M_STATUS3     (SSBI_REG_ADDR_IRQ_BASE + 3)
33 #define SSBI_REG_ADDR_IRQ_M_STATUS4     (SSBI_REG_ADDR_IRQ_BASE + 4)
34 #define SSBI_REG_ADDR_IRQ_BLK_SEL       (SSBI_REG_ADDR_IRQ_BASE + 5)
35 #define SSBI_REG_ADDR_IRQ_IT_STATUS     (SSBI_REG_ADDR_IRQ_BASE + 6)
36 #define SSBI_REG_ADDR_IRQ_CONFIG        (SSBI_REG_ADDR_IRQ_BASE + 7)
37 #define SSBI_REG_ADDR_IRQ_RT_STATUS     (SSBI_REG_ADDR_IRQ_BASE + 8)
38
39 #define PM_IRQF_LVL_SEL                 0x01    /* level select */
40 #define PM_IRQF_MASK_FE                 0x02    /* mask falling edge */
41 #define PM_IRQF_MASK_RE                 0x04    /* mask rising edge */
42 #define PM_IRQF_CLR                     0x08    /* clear interrupt */
43 #define PM_IRQF_BITS_MASK               0x70
44 #define PM_IRQF_BITS_SHIFT              4
45 #define PM_IRQF_WRITE                   0x80
46
47 #define PM_IRQF_MASK_ALL                (PM_IRQF_MASK_FE | \
48                                         PM_IRQF_MASK_RE)
49
50 struct pm_irq_chip {
51         struct device           *dev;
52         spinlock_t              pm_irq_lock;
53         unsigned int            devirq;
54         unsigned int            irq_base;
55         unsigned int            num_irqs;
56         unsigned int            num_blocks;
57         unsigned int            num_masters;
58         u8                      config[0];
59 };
60
61 static int pm8xxx_read_root_irq(const struct pm_irq_chip *chip, u8 *rp)
62 {
63         return pm8xxx_readb(chip->dev, SSBI_REG_ADDR_IRQ_ROOT, rp);
64 }
65
66 static int pm8xxx_read_master_irq(const struct pm_irq_chip *chip, u8 m, u8 *bp)
67 {
68         return pm8xxx_readb(chip->dev,
69                         SSBI_REG_ADDR_IRQ_M_STATUS1 + m, bp);
70 }
71
72 static int pm8xxx_read_block_irq(struct pm_irq_chip *chip, u8 bp, u8 *ip)
73 {
74         int     rc;
75
76         spin_lock(&chip->pm_irq_lock);
77         rc = pm8xxx_writeb(chip->dev, SSBI_REG_ADDR_IRQ_BLK_SEL, bp);
78         if (rc) {
79                 pr_err("Failed Selecting Block %d rc=%d\n", bp, rc);
80                 goto bail;
81         }
82
83         rc = pm8xxx_readb(chip->dev, SSBI_REG_ADDR_IRQ_IT_STATUS, ip);
84         if (rc)
85                 pr_err("Failed Reading Status rc=%d\n", rc);
86 bail:
87         spin_unlock(&chip->pm_irq_lock);
88         return rc;
89 }
90
91 static int pm8xxx_config_irq(struct pm_irq_chip *chip, u8 bp, u8 cp)
92 {
93         int     rc;
94
95         spin_lock(&chip->pm_irq_lock);
96         rc = pm8xxx_writeb(chip->dev, SSBI_REG_ADDR_IRQ_BLK_SEL, bp);
97         if (rc) {
98                 pr_err("Failed Selecting Block %d rc=%d\n", bp, rc);
99                 goto bail;
100         }
101
102         cp |= PM_IRQF_WRITE;
103         rc = pm8xxx_writeb(chip->dev, SSBI_REG_ADDR_IRQ_CONFIG, cp);
104         if (rc)
105                 pr_err("Failed Configuring IRQ rc=%d\n", rc);
106 bail:
107         spin_unlock(&chip->pm_irq_lock);
108         return rc;
109 }
110
111 static int pm8xxx_irq_block_handler(struct pm_irq_chip *chip, int block)
112 {
113         int pmirq, irq, i, ret = 0;
114         u8 bits;
115
116         ret = pm8xxx_read_block_irq(chip, block, &bits);
117         if (ret) {
118                 pr_err("Failed reading %d block ret=%d", block, ret);
119                 return ret;
120         }
121         if (!bits) {
122                 pr_err("block bit set in master but no irqs: %d", block);
123                 return 0;
124         }
125
126         /* Check IRQ bits */
127         for (i = 0; i < 8; i++) {
128                 if (bits & (1 << i)) {
129                         pmirq = block * 8 + i;
130                         irq = pmirq + chip->irq_base;
131                         generic_handle_irq(irq);
132                 }
133         }
134         return 0;
135 }
136
137 static int pm8xxx_irq_master_handler(struct pm_irq_chip *chip, int master)
138 {
139         u8 blockbits;
140         int block_number, i, ret = 0;
141
142         ret = pm8xxx_read_master_irq(chip, master, &blockbits);
143         if (ret) {
144                 pr_err("Failed to read master %d ret=%d\n", master, ret);
145                 return ret;
146         }
147         if (!blockbits) {
148                 pr_err("master bit set in root but no blocks: %d", master);
149                 return 0;
150         }
151
152         for (i = 0; i < 8; i++)
153                 if (blockbits & (1 << i)) {
154                         block_number = master * 8 + i;  /* block # */
155                         ret |= pm8xxx_irq_block_handler(chip, block_number);
156                 }
157         return ret;
158 }
159
160 static void pm8xxx_irq_handler(unsigned int irq, struct irq_desc *desc)
161 {
162         struct pm_irq_chip *chip = irq_desc_get_handler_data(desc);
163         struct irq_chip *irq_chip = irq_desc_get_chip(desc);
164         u8      root;
165         int     i, ret, masters = 0;
166
167         ret = pm8xxx_read_root_irq(chip, &root);
168         if (ret) {
169                 pr_err("Can't read root status ret=%d\n", ret);
170                 return;
171         }
172
173         /* on pm8xxx series masters start from bit 1 of the root */
174         masters = root >> 1;
175
176         /* Read allowed masters for blocks. */
177         for (i = 0; i < chip->num_masters; i++)
178                 if (masters & (1 << i))
179                         pm8xxx_irq_master_handler(chip, i);
180
181         irq_chip->irq_ack(&desc->irq_data);
182 }
183
184 static void pm8xxx_irq_mask_ack(struct irq_data *d)
185 {
186         struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
187         unsigned int pmirq = d->irq - chip->irq_base;
188         int     master, irq_bit;
189         u8      block, config;
190
191         block = pmirq / 8;
192         master = block / 8;
193         irq_bit = pmirq % 8;
194
195         config = chip->config[pmirq] | PM_IRQF_MASK_ALL | PM_IRQF_CLR;
196         pm8xxx_config_irq(chip, block, config);
197 }
198
199 static void pm8xxx_irq_unmask(struct irq_data *d)
200 {
201         struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
202         unsigned int pmirq = d->irq - chip->irq_base;
203         int     master, irq_bit;
204         u8      block, config;
205
206         block = pmirq / 8;
207         master = block / 8;
208         irq_bit = pmirq % 8;
209
210         config = chip->config[pmirq];
211         pm8xxx_config_irq(chip, block, config);
212 }
213
214 static int pm8xxx_irq_set_type(struct irq_data *d, unsigned int flow_type)
215 {
216         struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
217         unsigned int pmirq = d->irq - chip->irq_base;
218         int master, irq_bit;
219         u8 block, config;
220
221         block = pmirq / 8;
222         master = block / 8;
223         irq_bit  = pmirq % 8;
224
225         chip->config[pmirq] = (irq_bit << PM_IRQF_BITS_SHIFT)
226                                                         | PM_IRQF_MASK_ALL;
227         if (flow_type & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)) {
228                 if (flow_type & IRQF_TRIGGER_RISING)
229                         chip->config[pmirq] &= ~PM_IRQF_MASK_RE;
230                 if (flow_type & IRQF_TRIGGER_FALLING)
231                         chip->config[pmirq] &= ~PM_IRQF_MASK_FE;
232         } else {
233                 chip->config[pmirq] |= PM_IRQF_LVL_SEL;
234
235                 if (flow_type & IRQF_TRIGGER_HIGH)
236                         chip->config[pmirq] &= ~PM_IRQF_MASK_RE;
237                 else
238                         chip->config[pmirq] &= ~PM_IRQF_MASK_FE;
239         }
240
241         config = chip->config[pmirq] | PM_IRQF_CLR;
242         return pm8xxx_config_irq(chip, block, config);
243 }
244
245 static int pm8xxx_irq_set_wake(struct irq_data *d, unsigned int on)
246 {
247         return 0;
248 }
249
250 static struct irq_chip pm8xxx_irq_chip = {
251         .name           = "pm8xxx",
252         .irq_mask_ack   = pm8xxx_irq_mask_ack,
253         .irq_unmask     = pm8xxx_irq_unmask,
254         .irq_set_type   = pm8xxx_irq_set_type,
255         .irq_set_wake   = pm8xxx_irq_set_wake,
256         .flags          = IRQCHIP_MASK_ON_SUSPEND,
257 };
258
259 /**
260  * pm8xxx_get_irq_stat - get the status of the irq line
261  * @chip: pointer to identify a pmic irq controller
262  * @irq: the irq number
263  *
264  * The pm8xxx gpio and mpp rely on the interrupt block to read
265  * the values on their pins. This function is to facilitate reading
266  * the status of a gpio or an mpp line. The caller has to convert the
267  * gpio number to irq number.
268  *
269  * RETURNS:
270  * an int indicating the value read on that line
271  */
272 int pm8xxx_get_irq_stat(struct pm_irq_chip *chip, int irq)
273 {
274         int pmirq, rc;
275         u8  block, bits, bit;
276         unsigned long flags;
277
278         if (chip == NULL || irq < chip->irq_base ||
279                         irq >= chip->irq_base + chip->num_irqs)
280                 return -EINVAL;
281
282         pmirq = irq - chip->irq_base;
283
284         block = pmirq / 8;
285         bit = pmirq % 8;
286
287         spin_lock_irqsave(&chip->pm_irq_lock, flags);
288
289         rc = pm8xxx_writeb(chip->dev, SSBI_REG_ADDR_IRQ_BLK_SEL, block);
290         if (rc) {
291                 pr_err("Failed Selecting block irq=%d pmirq=%d blk=%d rc=%d\n",
292                         irq, pmirq, block, rc);
293                 goto bail_out;
294         }
295
296         rc = pm8xxx_readb(chip->dev, SSBI_REG_ADDR_IRQ_RT_STATUS, &bits);
297         if (rc) {
298                 pr_err("Failed Configuring irq=%d pmirq=%d blk=%d rc=%d\n",
299                         irq, pmirq, block, rc);
300                 goto bail_out;
301         }
302
303         rc = (bits & (1 << bit)) ? 1 : 0;
304
305 bail_out:
306         spin_unlock_irqrestore(&chip->pm_irq_lock, flags);
307
308         return rc;
309 }
310 EXPORT_SYMBOL_GPL(pm8xxx_get_irq_stat);
311
312 struct pm_irq_chip *  pm8xxx_irq_init(struct device *dev,
313                                 const struct pm8xxx_irq_platform_data *pdata)
314 {
315         struct pm_irq_chip  *chip;
316         int devirq, rc;
317         unsigned int pmirq;
318
319         if (!pdata) {
320                 pr_err("No platform data\n");
321                 return ERR_PTR(-EINVAL);
322         }
323
324         devirq = pdata->devirq;
325         if (devirq < 0) {
326                 pr_err("missing devirq\n");
327                 rc = devirq;
328                 return ERR_PTR(-EINVAL);
329         }
330
331         chip = kzalloc(sizeof(struct pm_irq_chip)
332                         + sizeof(u8) * pdata->irq_cdata.nirqs, GFP_KERNEL);
333         if (!chip) {
334                 pr_err("Cannot alloc pm_irq_chip struct\n");
335                 return ERR_PTR(-EINVAL);
336         }
337
338         chip->dev = dev;
339         chip->devirq = devirq;
340         chip->irq_base = pdata->irq_base;
341         chip->num_irqs = pdata->irq_cdata.nirqs;
342         chip->num_blocks = DIV_ROUND_UP(chip->num_irqs, 8);
343         chip->num_masters = DIV_ROUND_UP(chip->num_blocks, 8);
344         spin_lock_init(&chip->pm_irq_lock);
345
346         for (pmirq = 0; pmirq < chip->num_irqs; pmirq++) {
347                 irq_set_chip_and_handler(chip->irq_base + pmirq,
348                                 &pm8xxx_irq_chip,
349                                 handle_level_irq);
350                 irq_set_chip_data(chip->irq_base + pmirq, chip);
351 #ifdef CONFIG_ARM
352                 set_irq_flags(chip->irq_base + pmirq, IRQF_VALID);
353 #else
354                 irq_set_noprobe(chip->irq_base + pmirq);
355 #endif
356         }
357
358         irq_set_irq_type(devirq, pdata->irq_trigger_flag);
359         irq_set_handler_data(devirq, chip);
360         irq_set_chained_handler(devirq, pm8xxx_irq_handler);
361         set_irq_wake(devirq, 1);
362
363         return chip;
364 }
365
366 int pm8xxx_irq_exit(struct pm_irq_chip *chip)
367 {
368         irq_set_chained_handler(chip->devirq, NULL);
369         kfree(chip);
370         return 0;
371 }