[PATCH v3 3/7] mfd: pm8921: Migrate to irqdomains

Stephen Boyd
2014-01-08T18:37:46Z

Convert this driver to use irqdomains so that the PMIC's child
devices can be converted to devicetree.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
---
drivers/mfd/pm8921-core.c | 198 +++++++++++++++-----------------------
include/linux/mfd/pm8xxx/irq.h | 36 -------
include/linux/mfd/pm8xxx/pm8921.h | 30 ------
3 files changed, 75 insertions(+), 189 deletions(-)
delete mode 100644 include/linux/mfd/pm8xxx/irq.h
delete mode 100644 include/linux/mfd/pm8xxx/pm8921.h

diff --git a/drivers/mfd/pm8921-core.c b/drivers/mfd/pm8921-core.c
index 9ddc31f7a71d..c25e7dae150b 100644
--- a/drivers/mfd/pm8921-core.c
+++ b/drivers/mfd/pm8921-core.c
@@ -17,15 +17,15 @@
#include <linux/interrupt.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/irq.h>
+#include <linux/irqdomain.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/ssbi.h>
+#include <linux/of_platform.h>
#include <linux/mfd/core.h>
-#include <linux/mfd/pm8xxx/pm8921.h>
#include <linux/mfd/pm8xxx/core.h>
-#include <linux/mfd/pm8xxx/irq.h>

#define SSBI_REG_ADDR_IRQ_BASE 0x1BB

@@ -53,11 +53,12 @@
#define REG_HWREV 0x002 /* PMIC4 revision */
#define REG_HWREV_2 0x0E8 /* PMIC4 revision 2 */

+#define PM8921_NR_IRQS 256
+
struct pm_irq_chip {
struct device *dev;
spinlock_t pm_irq_lock;
- unsigned int devirq;
- unsigned int irq_base;
+ struct irq_domain *irqdomain;
unsigned int num_irqs;
unsigned int num_blocks;
unsigned int num_masters;
@@ -138,7 +139,7 @@ static int pm8xxx_irq_block_handler(struct pm_irq_chip *chip, int block)
for (i = 0; i < 8; i++) {
if (bits & (1 << i)) {
pmirq = block * 8 + i;
- irq = pmirq + chip->irq_base;
+ irq = irq_find_mapping(chip->irqdomain, pmirq);
generic_handle_irq(irq);
}
}
@@ -197,12 +198,11 @@ static void pm8xxx_irq_handler(unsigned int irq, struct irq_desc *desc)
static void pm8xxx_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 master, irq_bit;
+ unsigned int pmirq = irqd_to_hwirq(d);
+ int irq_bit;
u8 block, config;

block = pmirq / 8;
- master = block / 8;
irq_bit = pmirq % 8;

config = chip->config[pmirq] | PM_IRQF_MASK_ALL | PM_IRQF_CLR;
@@ -212,12 +212,11 @@ static void pm8xxx_irq_mask_ack(struct irq_data *d)
static void pm8xxx_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 master, irq_bit;
+ unsigned int pmirq = irqd_to_hwirq(d);
+ int irq_bit;
u8 block, config;

block = pmirq / 8;
- master = block / 8;
irq_bit = pmirq % 8;

config = chip->config[pmirq];
@@ -227,12 +226,11 @@ static void pm8xxx_irq_unmask(struct irq_data *d)
static int pm8xxx_irq_set_type(struct irq_data *d, unsigned int flow_type)
{
struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
- unsigned int pmirq = d->irq - chip->irq_base;
- int master, irq_bit;
+ unsigned int pmirq = irqd_to_hwirq(d);
+ int irq_bit;
u8 block, config;

block = pmirq / 8;
- master = block / 8;
irq_bit = pmirq % 8;

chip->config[pmirq] = (irq_bit << PM_IRQF_BITS_SHIFT)
@@ -287,12 +285,9 @@ static int pm8xxx_get_irq_stat(struct pm_irq_chip *chip, int irq)
int pmirq, rc;
u8 block, bits, bit;
unsigned long flags;
+ struct irq_data *irq_data = irq_get_irq_data(irq);

- if (chip == NULL || irq < chip->irq_base ||
- irq >= chip->irq_base + chip->num_irqs)
- return -EINVAL;
-
- pmirq = irq - chip->irq_base;
+ pmirq = irq_data->hwirq;

block = pmirq / 8;
bit = pmirq % 8;
@@ -321,67 +316,29 @@ bail_out:
return rc;
}

-static struct pm_irq_chip *pm8xxx_irq_init(struct device *dev,
- const struct pm8xxx_irq_platform_data *pdata)
-{
- struct pm_irq_chip *chip;
- int devirq, rc;
- unsigned int pmirq;
-
- if (!pdata) {
- pr_err("No platform data\n");
- return ERR_PTR(-EINVAL);
- }
+static struct lock_class_key pm8xxx_irq_lock_class;

- 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->num_blocks = DIV_ROUND_UP(chip->num_irqs, 8);
- chip->num_masters = DIV_ROUND_UP(chip->num_blocks, 8);
- spin_lock_init(&chip->pm_irq_lock);
+static int pm8xxx_irq_domain_map(struct irq_domain *d, unsigned int irq,
+ irq_hw_number_t hwirq)
+{
+ struct pm_irq_chip *chip = d->host_data;

- for (pmirq = 0; pmirq < chip->num_irqs; pmirq++) {
- irq_set_chip_and_handler(chip->irq_base + pmirq,
- &pm8xxx_irq_chip,
- handle_level_irq);
- irq_set_chip_data(chip->irq_base + pmirq, chip);
+ irq_set_lockdep_class(irq, &pm8xxx_irq_lock_class);
+ irq_set_chip_and_handler(irq, &pm8xxx_irq_chip, handle_level_irq);
+ irq_set_chip_data(irq, chip);
#ifdef CONFIG_ARM
- set_irq_flags(chip->irq_base + pmirq, IRQF_VALID);
+ set_irq_flags(irq, IRQF_VALID);
#else
- irq_set_noprobe(chip->irq_base + pmirq);
+ irq_set_noprobe(irq);
#endif
- }
-
- irq_set_irq_type(devirq, pdata->irq_trigger_flag);
- irq_set_handler_data(devirq, chip);
- irq_set_chained_handler(devirq, pm8xxx_irq_handler);
- irq_set_irq_wake(devirq, 1);
-
- return chip;
-}
-
-static int pm8xxx_irq_exit(struct pm_irq_chip *chip)
-{
- irq_set_chained_handler(chip->devirq, NULL);
- kfree(chip);
return 0;
}

+static const struct irq_domain_ops pm8xxx_irq_domain_ops = {
+ .xlate = irq_domain_xlate_twocell,
+ .map = pm8xxx_irq_domain_map,
+};
+
static int pm8921_readb(const struct device *dev, u16 addr, u8 *val)
{
const struct pm8xxx_drvdata *pm8921_drvdata = dev_get_drvdata(dev);
@@ -432,42 +389,19 @@ static struct pm8xxx_drvdata pm8921_drvdata = {
.pmic_read_irq_stat = pm8921_read_irq_stat,
};

-static int pm8921_add_subdevices(const struct pm8921_platform_data
- *pdata,
- struct pm8921 *pmic,
- u32 rev)
-{
- int ret = 0, irq_base = 0;
- struct pm_irq_chip *irq_chip;
-
- if (pdata->irq_pdata) {
- pdata->irq_pdata->irq_cdata.nirqs = PM8921_NR_IRQS;
- pdata->irq_pdata->irq_cdata.rev = rev;
- irq_base = pdata->irq_pdata->irq_base;
- irq_chip = pm8xxx_irq_init(pmic->dev, pdata->irq_pdata);
-
- if (IS_ERR(irq_chip)) {
- pr_err("Failed to init interrupts ret=%ld\n",
- PTR_ERR(irq_chip));
- return PTR_ERR(irq_chip);
- }
- pmic->irq_chip = irq_chip;
- }
- return ret;
-}
-
static int pm8921_probe(struct platform_device *pdev)
{
- const struct pm8921_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct pm8921 *pmic;
int rc;
u8 val;
+ unsigned int irq;
u32 rev;
+ struct pm_irq_chip *chip;
+ unsigned int nirqs = PM8921_NR_IRQS;

- if (!pdata) {
- pr_err("missing platform data\n");
- return -EINVAL;
- }
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ return irq;

pmic = devm_kzalloc(&pdev->dev, sizeof(struct pm8921), GFP_KERNEL);
if (!pmic) {
@@ -498,37 +432,55 @@ static int pm8921_probe(struct platform_device *pdev)
pm8921_drvdata.pm_chip_data = pmic;
platform_set_drvdata(pdev, &pm8921_drvdata);

- rc = pm8921_add_subdevices(pdata, pmic, rev);
+ chip = devm_kzalloc(&pdev->dev, sizeof(*chip) +
+ sizeof(chip->config[0]) * nirqs,
+ GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ pmic->irq_chip = chip;
+ chip->dev = &pdev->dev;
+ chip->num_irqs = nirqs;
+ chip->num_blocks = DIV_ROUND_UP(chip->num_irqs, 8);
+ chip->num_masters = DIV_ROUND_UP(chip->num_blocks, 8);
+ spin_lock_init(&chip->pm_irq_lock);
+
+ chip->irqdomain = irq_domain_add_linear(pdev->dev.of_node, nirqs,
+ &pm8xxx_irq_domain_ops,
+ chip);
+ if (!chip->irqdomain)
+ return -ENODEV;
+
+ irq_set_handler_data(irq, chip);
+ irq_set_chained_handler(irq, pm8xxx_irq_handler);
+ irq_set_irq_wake(irq, 1);
+
+ rc = of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
if (rc) {
- pr_err("Cannot add subdevices rc=%d\n", rc);
- goto err;
+ irq_set_chained_handler(irq, NULL);
+ irq_set_handler_data(irq, NULL);
+ irq_domain_remove(chip->irqdomain);
}

- /* gpio might not work if no irq device is found */
- WARN_ON(pmic->irq_chip == NULL);
+ return rc;
+}

+static int pm8921_remove_child(struct device *dev, void *unused)
+{
+ platform_device_unregister(to_platform_device(dev));
return 0;
-
-err:
- mfd_remove_devices(pmic->dev);
- return rc;
}

static int pm8921_remove(struct platform_device *pdev)
{
- struct pm8xxx_drvdata *drvdata;
- struct pm8921 *pmic = NULL;
-
- drvdata = platform_get_drvdata(pdev);
- if (drvdata)
- pmic = drvdata->pm_chip_data;
- if (pmic) {
- mfd_remove_devices(pmic->dev);
- if (pmic->irq_chip) {
- pm8xxx_irq_exit(pmic->irq_chip);
- pmic->irq_chip = NULL;
- }
- }
+ int irq = platform_get_irq(pdev, 0);
+ struct pm8921 *pmic = pm8921_drvdata.pm_chip_data;
+ struct pm_irq_chip *chip = pmic->irq_chip;
+
+ device_for_each_child(&pdev->dev, NULL, pm8921_remove_child);
+ irq_set_chained_handler(irq, NULL);
+ irq_set_handler_data(irq, NULL);
+ irq_domain_remove(chip->irqdomain);

return 0;
}
diff --git a/include/linux/mfd/pm8xxx/irq.h b/include/linux/mfd/pm8xxx/irq.h
deleted file mode 100644
index 1a11b02383f0..000000000000
--- a/include/linux/mfd/pm8xxx/irq.h
+++ /dev/null
@@ -1,36 +0,0 @@
-/*
- * Copyright (c) 2011, Code Aurora Forum. 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.
- */
-/*
- * Qualcomm PMIC irq 8xxx driver header file
- *
- */
-
-#ifndef __MFD_PM8XXX_IRQ_H
-#define __MFD_PM8XXX_IRQ_H
-
-#include <linux/errno.h>
-#include <linux/err.h>
-
-struct pm8xxx_irq_core_data {
- u32 rev;
- int nirqs;
-};
-
-struct pm8xxx_irq_platform_data {
- int irq_base;
- struct pm8xxx_irq_core_data irq_cdata;
- int devirq;
- int irq_trigger_flag;
-};
-
-#endif /* __MFD_PM8XXX_IRQ_H */
diff --git a/include/linux/mfd/pm8xxx/pm8921.h b/include/linux/mfd/pm8xxx/pm8921.h
deleted file mode 100644
index 00fa3de7659d..000000000000
--- a/include/linux/mfd/pm8xxx/pm8921.h
+++ /dev/null
@@ -1,30 +0,0 @@
-/*
- * Copyright (c) 2011, Code Aurora Forum. 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.
- */
-/*
- * Qualcomm PMIC 8921 driver header file
- *
- */
-
-#ifndef __MFD_PM8921_H
-#define __MFD_PM8921_H
-
-#include <linux/mfd/pm8xxx/irq.h>
-
-#define PM8921_NR_IRQS 256
-
-struct pm8921_platform_data {
- int irq_base;
- struct pm8xxx_irq_platform_data *irq_pdata;
-};
-
-#endif
--
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