diff mbox

[v2,2/5] pinctrl: exynos: Add irq_chip instance for Exynos7 wakeup interrupts

Message ID 1411460169-30536-3-git-send-email-a.kesavan@samsung.com (mailing list archive)
State New, archived
Headers show

Commit Message

Abhilash Kesavan Sept. 23, 2014, 8:16 a.m. UTC 
Exynos7 uses different offsets for wakeup interrupt configuration registers.
So a new irq_chip instance for Exynos7 wakeup interrupts is added. The irq_chip
selection is now based on the wakeup interrupt controller compatible string.

Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Reviewed-by: Thomas Abraham <thomas.ab@samsung.com>
Tested-by: Thomas Abraham <thomas.ab@samsung.com>
Cc: Thomas Abraham <thomas.ab@samsung.com>
Cc: Tomasz Figa <tomasz.figa@gmail.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
---
 .../bindings/pinctrl/samsung-pinctrl.txt           |    2 +
 drivers/pinctrl/samsung/pinctrl-exynos.c           |   48 +++++++++++++++-----
 drivers/pinctrl/samsung/pinctrl-exynos.h           |    3 ++
 3 files changed, 42 insertions(+), 11 deletions(-)

Comments

Tomasz Figa Sept. 23, 2014, 2:49 p.m. UTC | #1 
On 23.09.2014 10:16, Abhilash Kesavan wrote:
[snip]
> @@ -383,9 +377,11 @@ static int exynos_wkup_irq_set_wake(struct irq_data *irqd, unsigned int on)
>  /*
>   * irq_chip for wakeup interrupts
>   */
> -static struct exynos_irq_chip exynos_wkup_irq_chip = {
> +static struct exynos_irq_chip *exynos_wkup_irq_chip;
> +
[snip]
> @@ -459,7 +480,7 @@ static void exynos_irq_demux_eint16_31(unsigned int irq, struct irq_desc *desc)
>  static int exynos_wkup_irq_map(struct irq_domain *h, unsigned int virq,
>  					irq_hw_number_t hw)
>  {
> -	irq_set_chip_and_handler(virq, &exynos_wkup_irq_chip.chip,
> +	irq_set_chip_and_handler(virq, &exynos_wkup_irq_chip->chip,
>  					handle_level_irq);
>  	irq_set_chip_data(virq, h->host_data);
>  	set_irq_flags(virq, IRQF_VALID);
> @@ -491,7 +512,12 @@ static int exynos_eint_wkup_init(struct samsung_pinctrl_drv_data *d)
>  	int idx, irq;
>  
>  	for_each_child_of_node(dev->of_node, np) {
> -		if (of_match_node(exynos_wkup_irq_ids, np)) {
> +		const struct of_device_id *match;
> +
> +		match = of_match_node(exynos_wkup_irq_ids, np);
> +		if (match) {
> +			exynos_wkup_irq_chip = kmemdup(match->data,
> +				sizeof(struct exynos_irq_chip), GFP_KERNEL);

That's not exactly what I had in my mind.

You just changed the code to write to another global variable. This is
not the best practice and might cause hard to track issues in future,
when extending the driver.

From what I can see, the best solution would be to add .irq_chip field
to samsung_pin_bank struct. Then exynos_wkup_irq_map() could access it
through h->host_data pointer and exynos_irq_demux_eint16_31() could also
retrieve the irq chip through bank struct without the need too add chip
field to exynos_muxed_weint_data struct.

As a side effect, it would be possible to consolidate
exynos_wkup_irqd_ops with exynos_gpio_irqd_ops, which currently only
differ in irq chip passed as argument to irq_set_chip_and_handler() in
.map() callback.

Best regards,
Tomasz
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Abhilash Kesavan Sept. 29, 2014, 5:20 a.m. UTC | #2 
Hi Tomasz,

On Tue, Sep 23, 2014 at 8:19 PM, Tomasz Figa <tomasz.figa@gmail.com> wrote:
> On 23.09.2014 10:16, Abhilash Kesavan wrote:
> [snip]
>> @@ -383,9 +377,11 @@ static int exynos_wkup_irq_set_wake(struct irq_data *irqd, unsigned int on)
>>  /*
>>   * irq_chip for wakeup interrupts
>>   */
>> -static struct exynos_irq_chip exynos_wkup_irq_chip = {
>> +static struct exynos_irq_chip *exynos_wkup_irq_chip;
>> +
> [snip]
>> @@ -459,7 +480,7 @@ static void exynos_irq_demux_eint16_31(unsigned int irq, struct irq_desc *desc)
>>  static int exynos_wkup_irq_map(struct irq_domain *h, unsigned int virq,
>>                                       irq_hw_number_t hw)
>>  {
>> -     irq_set_chip_and_handler(virq, &exynos_wkup_irq_chip.chip,
>> +     irq_set_chip_and_handler(virq, &exynos_wkup_irq_chip->chip,
>>                                       handle_level_irq);
>>       irq_set_chip_data(virq, h->host_data);
>>       set_irq_flags(virq, IRQF_VALID);
>> @@ -491,7 +512,12 @@ static int exynos_eint_wkup_init(struct samsung_pinctrl_drv_data *d)
>>       int idx, irq;
>>
>>       for_each_child_of_node(dev->of_node, np) {
>> -             if (of_match_node(exynos_wkup_irq_ids, np)) {
>> +             const struct of_device_id *match;
>> +
>> +             match = of_match_node(exynos_wkup_irq_ids, np);
>> +             if (match) {
>> +                     exynos_wkup_irq_chip = kmemdup(match->data,
>> +                             sizeof(struct exynos_irq_chip), GFP_KERNEL);
>
> That's not exactly what I had in my mind.
>
> You just changed the code to write to another global variable. This is
> not the best practice and might cause hard to track issues in future,
> when extending the driver.
>
> From what I can see, the best solution would be to add .irq_chip field
> to samsung_pin_bank struct. Then exynos_wkup_irq_map() could access it
> through h->host_data pointer and exynos_irq_demux_eint16_31() could also
> retrieve the irq chip through bank struct without the need too add chip
> field to exynos_muxed_weint_data struct.
>
> As a side effect, it would be possible to consolidate
> exynos_wkup_irqd_ops with exynos_gpio_irqd_ops, which currently only
> differ in irq chip passed as argument to irq_set_chip_and_handler() in
> .map() callback.

I have posted v3 adding a new irq_chip field to the samsung_pin_bank
structure as per your suggestion. Please take a look.

Regards,
Abhilash
>
> Best regards,
> Tomasz
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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diff mbox

Patch

diff --git a/Documentation/devicetree/bindings/pinctrl/samsung-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/samsung-pinctrl.txt
index e82aaf4..f80519a 100644
--- a/Documentation/devicetree/bindings/pinctrl/samsung-pinctrl.txt
+++ b/Documentation/devicetree/bindings/pinctrl/samsung-pinctrl.txt
@@ -136,6 +136,8 @@  B. External Wakeup Interrupts: For supporting external wakeup interrupts, a
        found on Samsung S3C64xx SoCs,
      - samsung,exynos4210-wakeup-eint: represents wakeup interrupt controller
        found on Samsung Exynos4210 and S5PC110/S5PV210 SoCs.
+     - samsung,exynos7-wakeup-eint: represents wakeup interrupt controller
+       found on Samsung Exynos7 SoC.
    - interrupt-parent: phandle of the interrupt parent to which the external
      wakeup interrupts are forwarded to.
    - interrupts: interrupt used by multiplexed wakeup interrupts.
diff --git a/drivers/pinctrl/samsung/pinctrl-exynos.c b/drivers/pinctrl/samsung/pinctrl-exynos.c
index b5e1cd4..7072bfa 100644
--- a/drivers/pinctrl/samsung/pinctrl-exynos.c
+++ b/drivers/pinctrl/samsung/pinctrl-exynos.c
@@ -56,12 +56,6 @@  static struct samsung_pin_bank_type bank_type_alive = {
 	.reg_offset = { 0x00, 0x04, 0x08, 0x0c, },
 };
 
-/* list of external wakeup controllers supported */
-static const struct of_device_id exynos_wkup_irq_ids[] = {
-	{ .compatible = "samsung,exynos4210-wakeup-eint", },
-	{ }
-};
-
 static void exynos_irq_mask(struct irq_data *irqd)
 {
 	struct irq_chip *chip = irq_data_get_irq_chip(irqd);
@@ -383,9 +377,11 @@  static int exynos_wkup_irq_set_wake(struct irq_data *irqd, unsigned int on)
 /*
  * irq_chip for wakeup interrupts
  */
-static struct exynos_irq_chip exynos_wkup_irq_chip = {
+static struct exynos_irq_chip *exynos_wkup_irq_chip;
+
+static struct exynos_irq_chip exynos4210_wkup_irq_chip __initdata = {
 	.chip = {
-		.name = "exynos_wkup_irq_chip",
+		.name = "exynos4210_wkup_irq_chip",
 		.irq_unmask = exynos_irq_unmask,
 		.irq_mask = exynos_irq_mask,
 		.irq_ack = exynos_irq_ack,
@@ -399,6 +395,31 @@  static struct exynos_irq_chip exynos_wkup_irq_chip = {
 	.eint_pend = EXYNOS_WKUP_EPEND_OFFSET,
 };
 
+static struct exynos_irq_chip exynos7_wkup_irq_chip __initdata = {
+	.chip = {
+		.name = "exynos7_wkup_irq_chip",
+		.irq_unmask = exynos_irq_unmask,
+		.irq_mask = exynos_irq_mask,
+		.irq_ack = exynos_irq_ack,
+		.irq_set_type = exynos_irq_set_type,
+		.irq_set_wake = exynos_wkup_irq_set_wake,
+		.irq_request_resources = exynos_irq_request_resources,
+		.irq_release_resources = exynos_irq_release_resources,
+	},
+	.eint_con = EXYNOS7_WKUP_ECON_OFFSET,
+	.eint_mask = EXYNOS7_WKUP_EMASK_OFFSET,
+	.eint_pend = EXYNOS7_WKUP_EPEND_OFFSET,
+};
+
+/* list of external wakeup controllers supported */
+static const struct of_device_id exynos_wkup_irq_ids[] = {
+	{ .compatible = "samsung,exynos4210-wakeup-eint",
+			.data = &exynos4210_wkup_irq_chip },
+	{ .compatible = "samsung,exynos7-wakeup-eint",
+			.data = &exynos7_wkup_irq_chip },
+	{ }
+};
+
 /* interrupt handler for wakeup interrupts 0..15 */
 static void exynos_irq_eint0_15(unsigned int irq, struct irq_desc *desc)
 {
@@ -459,7 +480,7 @@  static void exynos_irq_demux_eint16_31(unsigned int irq, struct irq_desc *desc)
 static int exynos_wkup_irq_map(struct irq_domain *h, unsigned int virq,
 					irq_hw_number_t hw)
 {
-	irq_set_chip_and_handler(virq, &exynos_wkup_irq_chip.chip,
+	irq_set_chip_and_handler(virq, &exynos_wkup_irq_chip->chip,
 					handle_level_irq);
 	irq_set_chip_data(virq, h->host_data);
 	set_irq_flags(virq, IRQF_VALID);
@@ -491,7 +512,12 @@  static int exynos_eint_wkup_init(struct samsung_pinctrl_drv_data *d)
 	int idx, irq;
 
 	for_each_child_of_node(dev->of_node, np) {
-		if (of_match_node(exynos_wkup_irq_ids, np)) {
+		const struct of_device_id *match;
+
+		match = of_match_node(exynos_wkup_irq_ids, np);
+		if (match) {
+			exynos_wkup_irq_chip = kmemdup(match->data,
+				sizeof(struct exynos_irq_chip), GFP_KERNEL);
 			wkup_np = np;
 			break;
 		}
@@ -566,7 +592,7 @@  static int exynos_eint_wkup_init(struct samsung_pinctrl_drv_data *d)
 		muxed_data->banks[idx++] = bank;
 	}
 	muxed_data->nr_banks = muxed_banks;
-	muxed_data->chip = &exynos_wkup_irq_chip;
+	muxed_data->chip = exynos_wkup_irq_chip;
 
 	return 0;
 }
diff --git a/drivers/pinctrl/samsung/pinctrl-exynos.h b/drivers/pinctrl/samsung/pinctrl-exynos.h
index e060722..0db1e52 100644
--- a/drivers/pinctrl/samsung/pinctrl-exynos.h
+++ b/drivers/pinctrl/samsung/pinctrl-exynos.h
@@ -25,6 +25,9 @@ 
 #define EXYNOS_WKUP_ECON_OFFSET		0xE00
 #define EXYNOS_WKUP_EMASK_OFFSET	0xF00
 #define EXYNOS_WKUP_EPEND_OFFSET	0xF40
+#define EXYNOS7_WKUP_ECON_OFFSET	0x700
+#define EXYNOS7_WKUP_EMASK_OFFSET	0x900
+#define EXYNOS7_WKUP_EPEND_OFFSET	0xA00
 #define EXYNOS_SVC_OFFSET		0xB08
 #define EXYNOS_EINT_FUNC		0xF