2 * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
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.
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.
14 #define pr_fmt(fmt) "%s: " fmt, __func__
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>
27 #define SSBI_REG_ADDR_IRQ_BASE 0x1BB
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)
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
47 #define PM_IRQF_MASK_ALL (PM_IRQF_MASK_FE | \
52 spinlock_t pm_irq_lock;
54 unsigned int irq_base;
55 unsigned int num_irqs;
56 unsigned int num_blocks;
57 unsigned int num_masters;
61 static int pm8xxx_read_root_irq(const struct pm_irq_chip *chip, u8 *rp)
63 return pm8xxx_readb(chip->dev, SSBI_REG_ADDR_IRQ_ROOT, rp);
66 static int pm8xxx_read_master_irq(const struct pm_irq_chip *chip, u8 m, u8 *bp)
68 return pm8xxx_readb(chip->dev,
69 SSBI_REG_ADDR_IRQ_M_STATUS1 + m, bp);
72 static int pm8xxx_read_block_irq(struct pm_irq_chip *chip, u8 bp, u8 *ip)
76 spin_lock(&chip->pm_irq_lock);
77 rc = pm8xxx_writeb(chip->dev, SSBI_REG_ADDR_IRQ_BLK_SEL, bp);
79 pr_err("Failed Selecting Block %d rc=%d\n", bp, rc);
83 rc = pm8xxx_readb(chip->dev, SSBI_REG_ADDR_IRQ_IT_STATUS, ip);
85 pr_err("Failed Reading Status rc=%d\n", rc);
87 spin_unlock(&chip->pm_irq_lock);
91 static int pm8xxx_config_irq(struct pm_irq_chip *chip, u8 bp, u8 cp)
95 spin_lock(&chip->pm_irq_lock);
96 rc = pm8xxx_writeb(chip->dev, SSBI_REG_ADDR_IRQ_BLK_SEL, bp);
98 pr_err("Failed Selecting Block %d rc=%d\n", bp, rc);
103 rc = pm8xxx_writeb(chip->dev, SSBI_REG_ADDR_IRQ_CONFIG, cp);
105 pr_err("Failed Configuring IRQ rc=%d\n", rc);
107 spin_unlock(&chip->pm_irq_lock);
111 static int pm8xxx_irq_block_handler(struct pm_irq_chip *chip, int block)
113 int pmirq, irq, i, ret = 0;
116 ret = pm8xxx_read_block_irq(chip, block, &bits);
118 pr_err("Failed reading %d block ret=%d", block, ret);
122 pr_err("block bit set in master but no irqs: %d", block);
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);
137 static int pm8xxx_irq_master_handler(struct pm_irq_chip *chip, int master)
140 int block_number, i, ret = 0;
142 ret = pm8xxx_read_master_irq(chip, master, &blockbits);
144 pr_err("Failed to read master %d ret=%d\n", master, ret);
148 pr_err("master bit set in root but no blocks: %d", master);
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);
160 static void pm8xxx_irq_handler(unsigned int irq, struct irq_desc *desc)
162 struct pm_irq_chip *chip = irq_desc_get_handler_data(desc);
163 struct irq_chip *irq_chip = irq_desc_get_chip(desc);
165 int i, ret, masters = 0;
167 ret = pm8xxx_read_root_irq(chip, &root);
169 pr_err("Can't read root status ret=%d\n", ret);
173 /* on pm8xxx series masters start from bit 1 of the root */
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);
181 irq_chip->irq_ack(&desc->irq_data);
184 static void pm8xxx_irq_mask_ack(struct irq_data *d)
186 struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
187 unsigned int pmirq = d->irq - chip->irq_base;
195 config = chip->config[pmirq] | PM_IRQF_MASK_ALL | PM_IRQF_CLR;
196 pm8xxx_config_irq(chip, block, config);
199 static void pm8xxx_irq_unmask(struct irq_data *d)
201 struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
202 unsigned int pmirq = d->irq - chip->irq_base;
210 config = chip->config[pmirq];
211 pm8xxx_config_irq(chip, block, config);
214 static int pm8xxx_irq_set_type(struct irq_data *d, unsigned int flow_type)
216 struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
217 unsigned int pmirq = d->irq - chip->irq_base;
225 chip->config[pmirq] = (irq_bit << PM_IRQF_BITS_SHIFT)
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;
233 chip->config[pmirq] |= PM_IRQF_LVL_SEL;
235 if (flow_type & IRQF_TRIGGER_HIGH)
236 chip->config[pmirq] &= ~PM_IRQF_MASK_RE;
238 chip->config[pmirq] &= ~PM_IRQF_MASK_FE;
241 config = chip->config[pmirq] | PM_IRQF_CLR;
242 return pm8xxx_config_irq(chip, block, config);
245 static int pm8xxx_irq_set_wake(struct irq_data *d, unsigned int on)
250 static struct irq_chip pm8xxx_irq_chip = {
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,
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
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.
270 * an int indicating the value read on that line
272 int pm8xxx_get_irq_stat(struct pm_irq_chip *chip, int irq)
278 if (chip == NULL || irq < chip->irq_base ||
279 irq >= chip->irq_base + chip->num_irqs)
282 pmirq = irq - chip->irq_base;
287 spin_lock_irqsave(&chip->pm_irq_lock, flags);
289 rc = pm8xxx_writeb(chip->dev, SSBI_REG_ADDR_IRQ_BLK_SEL, block);
291 pr_err("Failed Selecting block irq=%d pmirq=%d blk=%d rc=%d\n",
292 irq, pmirq, block, rc);
296 rc = pm8xxx_readb(chip->dev, SSBI_REG_ADDR_IRQ_RT_STATUS, &bits);
298 pr_err("Failed Configuring irq=%d pmirq=%d blk=%d rc=%d\n",
299 irq, pmirq, block, rc);
303 rc = (bits & (1 << bit)) ? 1 : 0;
306 spin_unlock_irqrestore(&chip->pm_irq_lock, flags);
310 EXPORT_SYMBOL_GPL(pm8xxx_get_irq_stat);
312 struct pm_irq_chip * pm8xxx_irq_init(struct device *dev,
313 const struct pm8xxx_irq_platform_data *pdata)
315 struct pm_irq_chip *chip;
320 pr_err("No platform data\n");
321 return ERR_PTR(-EINVAL);
324 devirq = pdata->devirq;
326 pr_err("missing devirq\n");
328 return ERR_PTR(-EINVAL);
331 chip = kzalloc(sizeof(struct pm_irq_chip)
332 + sizeof(u8) * pdata->irq_cdata.nirqs, GFP_KERNEL);
334 pr_err("Cannot alloc pm_irq_chip struct\n");
335 return ERR_PTR(-EINVAL);
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);
346 for (pmirq = 0; pmirq < chip->num_irqs; pmirq++) {
347 irq_set_chip_and_handler(chip->irq_base + pmirq,
350 irq_set_chip_data(chip->irq_base + pmirq, chip);
352 set_irq_flags(chip->irq_base + pmirq, IRQF_VALID);
354 irq_set_noprobe(chip->irq_base + pmirq);
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);
366 int pm8xxx_irq_exit(struct pm_irq_chip *chip)
368 irq_set_chained_handler(chip->devirq, NULL);