M7350/kernel/drivers/mfd/pm8821-irq.c
2024-09-09 08:52:07 +00:00

431 lines
10 KiB
C

/*
* Copyright (c) 2012, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#define pr_fmt(fmt) "%s: " fmt, __func__
#include <linux/export.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/mfd/pm8xxx/core.h>
#include <linux/mfd/pm8xxx/pm8821-irq.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <mach/mpm.h>
#define PM8821_TOTAL_IRQ_MASTERS 2
#define PM8821_BLOCKS_PER_MASTER 7
#define PM8821_IRQ_MASTER1_SET 0x01
#define PM8821_IRQ_CLEAR_OFFSET 0x01
#define PM8821_IRQ_RT_STATUS_OFFSET 0x0F
#define PM8821_IRQ_MASK_REG_OFFSET 0x08
#define SSBI_REG_ADDR_IRQ_MASTER0 0x30
#define SSBI_REG_ADDR_IRQ_MASTER1 0xB0
#define MPM_PIN_FOR_8821_IRQ 7
#define SSBI_REG_ADDR_IRQ_IT_STATUS(master_base, block) (master_base + block)
/*
* Block 0 does not exist in PM8821 IRQ SSBI address space,
* IRQ0 is assigned to bit0 of block1.
*/
#define SSBI_REG_ADDR_IRQ_IT_CLEAR(master_base, block) \
(master_base + PM8821_IRQ_CLEAR_OFFSET + block)
#define SSBI_REG_ADDR_IRQ_RT_STATUS(master_base, block) \
(master_base + PM8821_IRQ_RT_STATUS_OFFSET + block)
#define SSBI_REG_ADDR_IRQ_MASK(master_base, block) \
(master_base + PM8821_IRQ_MASK_REG_OFFSET + block)
struct pm_irq_chip {
struct device *dev;
spinlock_t pm_irq_lock;
unsigned int base_addr;
unsigned int devirq;
unsigned int irq_base;
unsigned int num_irqs;
int masters[PM8821_TOTAL_IRQ_MASTERS];
};
static int pm8821_irq_masked_write(struct pm_irq_chip *chip, u16 addr,
u8 mask, u8 val)
{
int rc;
u8 reg;
rc = pm8xxx_readb(chip->dev, addr, &reg);
if (rc) {
pr_err("read failed addr = %03X, rc = %d\n", addr, rc);
return rc;
}
reg &= ~mask;
reg |= val & mask;
rc = pm8xxx_writeb(chip->dev, addr, reg);
if (rc) {
pr_err("write failed addr = %03X, rc = %d\n", addr, rc);
return rc;
}
return 0;
}
static int pm8821_read_master_irq(const struct pm_irq_chip *chip,
int m, u8 *master)
{
return pm8xxx_readb(chip->dev, chip->masters[m], master);
}
static int pm8821_read_block_irq(struct pm_irq_chip *chip, int master,
u8 block, u8 *bits)
{
int rc;
spin_lock(&chip->pm_irq_lock);
rc = pm8xxx_readb(chip->dev,
SSBI_REG_ADDR_IRQ_IT_STATUS(chip->masters[master], block), bits);
if (rc)
pr_err("Failed Reading Status rc=%d\n", rc);
spin_unlock(&chip->pm_irq_lock);
return rc;
}
static int pm8821_irq_block_handler(struct pm_irq_chip *chip,
int master_number, int block)
{
int pmirq, irq, i, ret;
u8 bits;
ret = pm8821_read_block_irq(chip, master_number, block, &bits);
if (ret) {
pr_err("Failed reading %d block ret=%d", block, ret);
return ret;
}
if (!bits) {
pr_err("block bit set in master but no irqs: %d", block);
return 0;
}
/* Convert block offset to global block number */
block += (master_number * PM8821_BLOCKS_PER_MASTER) - 1;
/* Check IRQ bits */
for (i = 0; i < 8; i++) {
if (bits & BIT(i)) {
pmirq = (block << 3) + i;
irq = pmirq + chip->irq_base;
generic_handle_irq(irq);
}
}
return 0;
}
static int pm8821_irq_read_master(struct pm_irq_chip *chip,
int master_number, u8 master_val)
{
int ret = 0;
int block;
for (block = 1; block < 8; block++) {
if (master_val & BIT(block)) {
ret |= pm8821_irq_block_handler(chip,
master_number, block);
}
}
return ret;
}
static irqreturn_t pm8821_irq_handler(int irq, void *data)
{
struct pm_irq_chip *chip = data;
int ret;
u8 master;
ret = pm8821_read_master_irq(chip, 0, &master);
if (ret) {
pr_err("Failed to read master 0 ret=%d\n", ret);
return ret;
}
if (master & ~PM8821_IRQ_MASTER1_SET)
pm8821_irq_read_master(chip, 0, master);
if (!(master & PM8821_IRQ_MASTER1_SET))
goto done;
ret = pm8821_read_master_irq(chip, 1, &master);
if (ret) {
pr_err("Failed to read master 1 ret=%d\n", ret);
return ret;
}
pm8821_irq_read_master(chip, 1, master);
done:
return IRQ_HANDLED;
}
static void pm8821_irq_mask(struct irq_data *d)
{
struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
unsigned int pmirq = d->irq - chip->irq_base;
int irq_bit, rc;
u8 block, master;
block = pmirq >> 3;
master = block / PM8821_BLOCKS_PER_MASTER;
irq_bit = pmirq % 8;
block %= PM8821_BLOCKS_PER_MASTER;
spin_lock(&chip->pm_irq_lock);
rc = pm8821_irq_masked_write(chip,
SSBI_REG_ADDR_IRQ_MASK(chip->masters[master], block),
BIT(irq_bit), BIT(irq_bit));
if (rc)
pr_err("Failed to read/write mask IRQ:%d rc=%d\n", pmirq, rc);
spin_unlock(&chip->pm_irq_lock);
}
static void pm8821_irq_mask_ack(struct irq_data *d)
{
struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
unsigned int pmirq = d->irq - chip->irq_base;
int irq_bit, rc;
u8 block, master;
block = pmirq >> 3;
master = block / PM8821_BLOCKS_PER_MASTER;
irq_bit = pmirq % 8;
block %= PM8821_BLOCKS_PER_MASTER;
spin_lock(&chip->pm_irq_lock);
rc = pm8821_irq_masked_write(chip,
SSBI_REG_ADDR_IRQ_MASK(chip->masters[master], block),
BIT(irq_bit), BIT(irq_bit));
if (rc) {
pr_err("Failed to read/write mask IRQ:%d rc=%d\n", pmirq, rc);
goto fail;
}
rc = pm8821_irq_masked_write(chip,
SSBI_REG_ADDR_IRQ_IT_CLEAR(chip->masters[master], block),
BIT(irq_bit), BIT(irq_bit));
if (rc) {
pr_err("Failed to read/write IT_CLEAR IRQ:%d rc=%d\n",
pmirq, rc);
}
fail:
spin_unlock(&chip->pm_irq_lock);
}
static void pm8821_irq_unmask(struct irq_data *d)
{
struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
unsigned int pmirq = d->irq - chip->irq_base;
int irq_bit, rc;
u8 block, master;
block = pmirq >> 3;
master = block / PM8821_BLOCKS_PER_MASTER;
irq_bit = pmirq % 8;
block %= PM8821_BLOCKS_PER_MASTER;
spin_lock(&chip->pm_irq_lock);
rc = pm8821_irq_masked_write(chip,
SSBI_REG_ADDR_IRQ_MASK(chip->masters[master], block),
BIT(irq_bit), ~BIT(irq_bit));
if (rc)
pr_err("Failed to read/write unmask IRQ:%d rc=%d\n", pmirq, rc);
spin_unlock(&chip->pm_irq_lock);
}
static int pm8821_irq_set_type(struct irq_data *d, unsigned int flow_type)
{
/*
* PM8821 IRQ controller does not have explicit software support for
* IRQ flow type.
*/
return 0;
}
static int pm8821_irq_set_wake(struct irq_data *d, unsigned int on)
{
return 0;
}
static int pm8821_irq_read_line(struct irq_data *d)
{
struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
return pm8821_get_irq_stat(chip, d->irq);
}
static struct irq_chip pm_irq_chip = {
.name = "pm8821-irq",
.irq_mask = pm8821_irq_mask,
.irq_mask_ack = pm8821_irq_mask_ack,
.irq_unmask = pm8821_irq_unmask,
.irq_set_type = pm8821_irq_set_type,
.irq_set_wake = pm8821_irq_set_wake,
.irq_read_line = pm8821_irq_read_line,
.flags = IRQCHIP_MASK_ON_SUSPEND,
};
/**
* pm8821_get_irq_stat - get the status of the irq line
* @chip: pointer to identify a pmic irq controller
* @irq: the irq number
*
* The pm8821 gpio and mpp rely on the interrupt block to read
* the values on their pins. This function is to facilitate reading
* the status of a gpio or an mpp line. The caller has to convert the
* gpio number to irq number.
*
* RETURNS:
* an int indicating the value read on that line
*/
int pm8821_get_irq_stat(struct pm_irq_chip *chip, int irq)
{
int pmirq, rc;
u8 block, bits, bit, master;
unsigned long flags;
if (chip == NULL || irq < chip->irq_base
|| irq >= chip->irq_base + chip->num_irqs)
return -EINVAL;
pmirq = irq - chip->irq_base;
block = pmirq >> 3;
master = block / PM8821_BLOCKS_PER_MASTER;
bit = pmirq % 8;
block %= PM8821_BLOCKS_PER_MASTER;
spin_lock_irqsave(&chip->pm_irq_lock, flags);
rc = pm8xxx_readb(chip->dev,
SSBI_REG_ADDR_IRQ_RT_STATUS(chip->masters[master], block),
&bits);
if (rc) {
pr_err("Failed Configuring irq=%d pmirq=%d blk=%d rc=%d\n",
irq, pmirq, block, rc);
goto bail_out;
}
rc = (bits & BIT(bit)) ? 1 : 0;
bail_out:
spin_unlock_irqrestore(&chip->pm_irq_lock, flags);
return rc;
}
EXPORT_SYMBOL_GPL(pm8821_get_irq_stat);
struct pm_irq_chip * __devinit pm8821_irq_init(struct device *dev,
const struct pm8xxx_irq_platform_data *pdata)
{
struct pm_irq_chip *chip;
int devirq, rc, blocks, masters;
unsigned int pmirq;
if (!pdata) {
pr_err("No platform data\n");
return ERR_PTR(-EINVAL);
}
devirq = pdata->devirq;
if (devirq < 0) {
pr_err("missing devirq\n");
rc = devirq;
return ERR_PTR(-EINVAL);
}
chip = kzalloc(sizeof(struct pm_irq_chip)
+ sizeof(u8) * pdata->irq_cdata.nirqs, GFP_KERNEL);
if (!chip) {
pr_err("Cannot alloc pm_irq_chip struct\n");
return ERR_PTR(-EINVAL);
}
chip->dev = dev;
chip->devirq = devirq;
chip->irq_base = pdata->irq_base;
chip->num_irqs = pdata->irq_cdata.nirqs;
chip->base_addr = pdata->irq_cdata.base_addr;
blocks = DIV_ROUND_UP(pdata->irq_cdata.nirqs, 8);
masters = DIV_ROUND_UP(blocks, PM8821_BLOCKS_PER_MASTER);
chip->masters[0] = chip->base_addr + SSBI_REG_ADDR_IRQ_MASTER0;
chip->masters[1] = chip->base_addr + SSBI_REG_ADDR_IRQ_MASTER1;
if (masters != PM8821_TOTAL_IRQ_MASTERS) {
pr_err("Unequal number of masters, passed: %d, "
"should have been: %d\n", masters, PM8821_TOTAL_IRQ_MASTERS);
kfree(chip);
return ERR_PTR(-EINVAL);
}
spin_lock_init(&chip->pm_irq_lock);
for (pmirq = 0; pmirq < chip->num_irqs; pmirq++) {
irq_set_chip_and_handler(chip->irq_base + pmirq,
&pm_irq_chip, handle_level_irq);
irq_set_chip_data(chip->irq_base + pmirq, chip);
#ifdef CONFIG_ARM
set_irq_flags(chip->irq_base + pmirq, IRQF_VALID);
#else
irq_set_noprobe(chip->irq_base + pmirq);
#endif
}
if (devirq != 0) {
rc = request_irq(devirq, pm8821_irq_handler,
pdata->irq_trigger_flag, "pm8821_sec_irq", chip);
if (rc) {
pr_err("failed to request_irq for %d rc=%d\n",
devirq, rc);
kfree(chip);
return ERR_PTR(rc);
} else{
irq_set_irq_wake(devirq, 1);
msm_mpm_set_pin_wake(MPM_PIN_FOR_8821_IRQ, 1);
msm_mpm_set_pin_type(MPM_PIN_FOR_8821_IRQ,
pdata->irq_trigger_flag);
}
}
return chip;
}
int pm8821_irq_exit(struct pm_irq_chip *chip)
{
irq_set_chained_handler(chip->devirq, NULL);
kfree(chip);
return 0;
}