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Message-id: <1372077594-17052-2-git-send-email-t.figa@samsung.com>
Date: Mon, 24 Jun 2013 14:39:52 +0200
From: Tomasz Figa <t.figa@...sung.com>
To: linux-kernel@...r.kernel.org
Cc: linux-samsung-soc@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
Kukjin Kim <kgene.kim@...sung.com>,
Alessandro Zummo <a.zummo@...ertech.it>,
Grant Likely <grant.likely@...aro.org>,
Jiri Kosina <jkosina@...e.cz>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
Masanari Iida <standby24x7@...il.com>,
Rob Herring <rob.herring@...xeda.com>,
Rob Landley <rob@...dley.net>, rtc-linux@...glegroups.com,
Russell King <linux@....linux.org.uk>,
Samuel Ortiz <sameo@...ux.intel.com>,
Rasmus Villemoes <linux@...musvillemoes.dk>,
Tomasz Figa <t.figa@...sung.com>
Subject: [PATCH v3 1/3] mfd: Add irq domain support for max8998 interrupts
This patch adds irq domain support for max8998 interrupts.
To keep both non-DT and DT worlds happy, simple domain is used, which is
linear when no explicit IRQ base is specified and legacy, with static
mapping, otherwise.
Signed-off-by: Tomasz Figa <t.figa@...sung.com>
---
drivers/mfd/Kconfig | 1 +
drivers/mfd/max8998-irq.c | 65 +++++++++++++++++++++++--------------
drivers/rtc/rtc-max8998.c | 12 ++++++-
include/linux/mfd/max8998-private.h | 5 ++-
include/linux/mfd/max8998.h | 2 +-
5 files changed, 57 insertions(+), 28 deletions(-)
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index d54e985..360be92 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1002,6 +1002,7 @@ config MFD_TC6393XB
config MFD_VX855
tristate "VIA VX855/VX875 integrated south bridge"
depends on PCI && GENERIC_HARDIRQS
+ select IRQ_DOMAIN
select MFD_CORE
help
Say yes here to enable support for various functions of the
diff --git a/drivers/mfd/max8998-irq.c b/drivers/mfd/max8998-irq.c
index 5919710..c469477 100644
--- a/drivers/mfd/max8998-irq.c
+++ b/drivers/mfd/max8998-irq.c
@@ -14,6 +14,7 @@
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
+#include <linux/irqdomain.h>
#include <linux/mfd/max8998-private.h>
struct max8998_irq_data {
@@ -99,7 +100,8 @@ static struct max8998_irq_data max8998_irqs[] = {
static inline struct max8998_irq_data *
irq_to_max8998_irq(struct max8998_dev *max8998, int irq)
{
- return &max8998_irqs[irq - max8998->irq_base];
+ struct irq_data *data = irq_get_irq_data(irq);
+ return &max8998_irqs[data->hwirq];
}
static void max8998_irq_lock(struct irq_data *data)
@@ -176,8 +178,14 @@ static irqreturn_t max8998_irq_thread(int irq, void *data)
/* Report */
for (i = 0; i < MAX8998_IRQ_NR; i++) {
- if (irq_reg[max8998_irqs[i].reg - 1] & max8998_irqs[i].mask)
- handle_nested_irq(max8998->irq_base + i);
+ if (irq_reg[max8998_irqs[i].reg - 1] & max8998_irqs[i].mask) {
+ irq = irq_find_mapping(max8998->irq_domain, i);
+ if (WARN_ON(!irq)) {
+ disable_irq_nosync(max8998->irq);
+ return IRQ_NONE;
+ }
+ handle_nested_irq(irq);
+ }
}
return IRQ_HANDLED;
@@ -185,27 +193,40 @@ static irqreturn_t max8998_irq_thread(int irq, void *data)
int max8998_irq_resume(struct max8998_dev *max8998)
{
- if (max8998->irq && max8998->irq_base)
- max8998_irq_thread(max8998->irq_base, max8998);
+ if (max8998->irq && max8998->irq_domain)
+ max8998_irq_thread(max8998->irq, max8998);
+ return 0;
+}
+
+static int max8998_irq_domain_map(struct irq_domain *d, unsigned int irq,
+ irq_hw_number_t hw)
+{
+ struct max8997_dev *max8998 = d->host_data;
+
+ irq_set_chip_data(irq, max8998);
+ irq_set_chip_and_handler(irq, &max8998_irq_chip, handle_edge_irq);
+ irq_set_nested_thread(irq, 1);
+#ifdef CONFIG_ARM
+ set_irq_flags(irq, IRQF_VALID);
+#else
+ irq_set_noprobe(irq);
+#endif
return 0;
}
+static struct irq_domain_ops max8998_irq_domain_ops = {
+ .map = max8998_irq_domain_map,
+};
+
int max8998_irq_init(struct max8998_dev *max8998)
{
int i;
- int cur_irq;
int ret;
+ struct irq_domain *domain;
if (!max8998->irq) {
dev_warn(max8998->dev,
"No interrupt specified, no interrupts\n");
- max8998->irq_base = 0;
- return 0;
- }
-
- if (!max8998->irq_base) {
- dev_err(max8998->dev,
- "No interrupt base specified, no interrupts\n");
return 0;
}
@@ -221,19 +242,13 @@ int max8998_irq_init(struct max8998_dev *max8998)
max8998_write_reg(max8998->i2c, MAX8998_REG_STATUSM1, 0xff);
max8998_write_reg(max8998->i2c, MAX8998_REG_STATUSM2, 0xff);
- /* register with genirq */
- for (i = 0; i < MAX8998_IRQ_NR; i++) {
- cur_irq = i + max8998->irq_base;
- irq_set_chip_data(cur_irq, max8998);
- irq_set_chip_and_handler(cur_irq, &max8998_irq_chip,
- handle_edge_irq);
- irq_set_nested_thread(cur_irq, 1);
-#ifdef CONFIG_ARM
- set_irq_flags(cur_irq, IRQF_VALID);
-#else
- irq_set_noprobe(cur_irq);
-#endif
+ domain = irq_domain_add_simple(NULL, MAX8998_IRQ_NR,
+ max8998->irq_base, &max8998_irq_domain_ops, max8998);
+ if (!domain) {
+ dev_err(max8998->dev, "could not create irq domain\n");
+ return -ENODEV;
}
+ max8998->irq_domain = domain;
ret = request_threaded_irq(max8998->irq, NULL, max8998_irq_thread,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
diff --git a/drivers/rtc/rtc-max8998.c b/drivers/rtc/rtc-max8998.c
index d5af7ba..46f2301 100644
--- a/drivers/rtc/rtc-max8998.c
+++ b/drivers/rtc/rtc-max8998.c
@@ -16,6 +16,7 @@
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/bcd.h>
+#include <linux/irqdomain.h>
#include <linux/rtc.h>
#include <linux/platform_device.h>
#include <linux/mfd/max8998.h>
@@ -264,7 +265,6 @@ static int max8998_rtc_probe(struct platform_device *pdev)
info->dev = &pdev->dev;
info->max8998 = max8998;
info->rtc = max8998->rtc;
- info->irq = max8998->irq_base + MAX8998_IRQ_ALARM0;
platform_set_drvdata(pdev, info);
@@ -277,6 +277,15 @@ static int max8998_rtc_probe(struct platform_device *pdev)
goto out_rtc;
}
+ if (!max8998->irq_domain)
+ goto no_irq;
+
+ info->irq = irq_create_mapping(max8998->irq_domain, MAX8998_IRQ_ALARM0);
+ if (!info->irq) {
+ dev_warn(&pdev->dev, "Failed to map alarm IRQ\n");
+ goto no_irq;
+ }
+
ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
max8998_rtc_alarm_irq, 0, "rtc-alarm0", info);
@@ -284,6 +293,7 @@ static int max8998_rtc_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
info->irq, ret);
+no_irq:
dev_info(&pdev->dev, "RTC CHIP NAME: %s\n", pdev->id_entry->name);
if (pdata && pdata->rtc_delay) {
info->lp3974_bug_workaround = true;
diff --git a/include/linux/mfd/max8998-private.h b/include/linux/mfd/max8998-private.h
index effa5d3..bfb48b6 100644
--- a/include/linux/mfd/max8998-private.h
+++ b/include/linux/mfd/max8998-private.h
@@ -132,6 +132,8 @@ enum {
#define MAX8998_ENRAMP (1 << 4)
+struct irq_domain;
+
/**
* struct max8998_dev - max8998 master device for sub-drivers
* @dev: master device of the chip (can be used to access platform data)
@@ -153,7 +155,8 @@ struct max8998_dev {
struct mutex iolock;
struct mutex irqlock;
- int irq_base;
+ unsigned int irq_base;
+ struct irq_domain *irq_domain;
int irq;
int ono;
u8 irq_masks_cur[MAX8998_NUM_IRQ_REGS];
diff --git a/include/linux/mfd/max8998.h b/include/linux/mfd/max8998.h
index 6823548..7547118 100644
--- a/include/linux/mfd/max8998.h
+++ b/include/linux/mfd/max8998.h
@@ -100,7 +100,7 @@ struct max8998_regulator_data {
struct max8998_platform_data {
struct max8998_regulator_data *regulators;
int num_regulators;
- int irq_base;
+ unsigned int irq_base;
int ono;
bool buck_voltage_lock;
int buck1_voltage1;
--
1.8.2.1
--
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