[PATCH V2 0/7] gpio: zynq: Update on gpio-zynq driver

[PATCH V2 0/7] gpio: zynq: Update on gpio-zynq driver

[Srinivas Neeli]

This patch series does the following:
-protect direction in/out with a spinlock
-Add binding for Versal gpio
-Add binding for pmc gpio node
-Add Versal support
-Disable the irq if it is not a wakeup source
-Add pmc gpio support
-Remove error prints in EPROBE_DEFER

---
Changes in V2:
- In previous series [PATCH 1/8] already applied on "linux-next".
- Fixed checkpatch warning for spinlock description. 
- Added description for Versal PS_GPIO and PMC_GPIO.
---

Glenn Langedock (1):
  gpio: zynq: protect direction in/out with a spinlock

Shubhrajyoti Datta (6):
  dt-bindings: gpio: Add binding for Versal gpio
  devicetree-binding: Add pmc gpio node
  gpio: zynq: Add Versal support
  gpio: zynq: Disable the irq if it is not a wakeup source
  gpio: zynq: Add pmc gpio support
  gpio: zynq: Remove error prints in EPROBE_DEFER

 .../devicetree/bindings/gpio/gpio-zynq.txt         |  4 +-
 drivers/gpio/gpio-zynq.c                           | 66 +++++++++++++++++++++-
 2 files changed, 67 insertions(+), 3 deletions(-)

-- 
2.7.4

[PATCH V2 0/7] gpio: zynq: Update on gpio-zynq driver

[Srinivas Neeli]

This patch series does the following:
-protect direction in/out with a spinlock
-Add binding for Versal gpio
-Add binding for pmc gpio node
-Add Versal support
-Disable the irq if it is not a wakeup source
-Add pmc gpio support
-Remove error prints in EPROBE_DEFER

---
Changes in V2:
- In previous series [PATCH 1/8] already applied on "linux-next".
- Fixed checkpatch warning for spinlock description. 
- Added description for Versal PS_GPIO and PMC_GPIO.
---

Glenn Langedock (1):
  gpio: zynq: protect direction in/out with a spinlock

Shubhrajyoti Datta (6):
  dt-bindings: gpio: Add binding for Versal gpio
  devicetree-binding: Add pmc gpio node
  gpio: zynq: Add Versal support
  gpio: zynq: Disable the irq if it is not a wakeup source
  gpio: zynq: Add pmc gpio support
  gpio: zynq: Remove error prints in EPROBE_DEFER

 .../devicetree/bindings/gpio/gpio-zynq.txt         |  4 +-
 drivers/gpio/gpio-zynq.c                           | 66 +++++++++++++++++++++-
 2 files changed, 67 insertions(+), 3 deletions(-)

-- 
2.7.4


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[PATCH V2 1/7] gpio: zynq: protect direction in/out with a spinlock

[Srinivas Neeli]

From: Glenn Langedock <Glenn.Langedock@barco.com>

Fix race condition when changing the direction (in/out) of the GPIO pin.
The read-modify-write sequence (as coded in the driver) isn't atomic and
requires synchronization (spinlock).

Signed-off-by: Glenn Langedock <Glenn.Langedock@barco.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Srinivas Neeli <srinivas.neeli@xilinx.com>
---
Changes in V2:
-Updated spinlock comment message.
---
 drivers/gpio/gpio-zynq.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/gpio/gpio-zynq.c b/drivers/gpio/gpio-zynq.c
index 05ba16fffdad..fb93b35ab19e 100644
--- a/drivers/gpio/gpio-zynq.c
+++ b/drivers/gpio/gpio-zynq.c
@@ -10,6 +10,7 @@
 #include <linux/gpio/driver.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
+#include <linux/spinlock.h>
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
@@ -116,6 +117,7 @@ struct gpio_regs {
  * @irq:	interrupt for the GPIO device
  * @p_data:	pointer to platform data
  * @context:	context registers
+ * @dirlock:	lock used for direction in/out synchronization
  */
 struct zynq_gpio {
 	struct gpio_chip chip;
@@ -124,6 +126,7 @@ struct zynq_gpio {
 	int irq;
 	const struct zynq_platform_data *p_data;
 	struct gpio_regs context;
+	spinlock_t dirlock; /* lock */
 };
 
 /**
@@ -297,6 +300,7 @@ static int zynq_gpio_dir_in(struct gpio_chip *chip, unsigned int pin)
 {
 	u32 reg;
 	unsigned int bank_num, bank_pin_num;
+	unsigned long flags;
 	struct zynq_gpio *gpio = gpiochip_get_data(chip);
 
 	zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
@@ -310,9 +314,11 @@ static int zynq_gpio_dir_in(struct gpio_chip *chip, unsigned int pin)
 		return -EINVAL;
 
 	/* clear the bit in direction mode reg to set the pin as input */
+	spin_lock_irqsave(&gpio->dirlock, flags);
 	reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
 	reg &= ~BIT(bank_pin_num);
 	writel_relaxed(reg, gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
+	spin_unlock_irqrestore(&gpio->dirlock, flags);
 
 	return 0;
 }
@@ -334,11 +340,13 @@ static int zynq_gpio_dir_out(struct gpio_chip *chip, unsigned int pin,
 {
 	u32 reg;
 	unsigned int bank_num, bank_pin_num;
+	unsigned long flags;
 	struct zynq_gpio *gpio = gpiochip_get_data(chip);
 
 	zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
 
 	/* set the GPIO pin as output */
+	spin_lock_irqsave(&gpio->dirlock, flags);
 	reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
 	reg |= BIT(bank_pin_num);
 	writel_relaxed(reg, gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
@@ -347,6 +355,7 @@ static int zynq_gpio_dir_out(struct gpio_chip *chip, unsigned int pin,
 	reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_OUTEN_OFFSET(bank_num));
 	reg |= BIT(bank_pin_num);
 	writel_relaxed(reg, gpio->base_addr + ZYNQ_GPIO_OUTEN_OFFSET(bank_num));
+	spin_unlock_irqrestore(&gpio->dirlock, flags);
 
 	/* set the state of the pin */
 	zynq_gpio_set_value(chip, pin, state);
@@ -885,6 +894,8 @@ static int zynq_gpio_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	spin_lock_init(&gpio->dirlock);
+
 	pm_runtime_set_active(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
 	ret = pm_runtime_get_sync(&pdev->dev);
-- 
2.7.4

[PATCH V2 1/7] gpio: zynq: protect direction in/out with a spinlock

[Srinivas Neeli]

From: Glenn Langedock <Glenn.Langedock@barco.com>

Fix race condition when changing the direction (in/out) of the GPIO pin.
The read-modify-write sequence (as coded in the driver) isn't atomic and
requires synchronization (spinlock).

Signed-off-by: Glenn Langedock <Glenn.Langedock@barco.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Srinivas Neeli <srinivas.neeli@xilinx.com>
---
Changes in V2:
-Updated spinlock comment message.
---
 drivers/gpio/gpio-zynq.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/gpio/gpio-zynq.c b/drivers/gpio/gpio-zynq.c
index 05ba16fffdad..fb93b35ab19e 100644
--- a/drivers/gpio/gpio-zynq.c
+++ b/drivers/gpio/gpio-zynq.c
@@ -10,6 +10,7 @@
 #include <linux/gpio/driver.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
+#include <linux/spinlock.h>
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
@@ -116,6 +117,7 @@ struct gpio_regs {
  * @irq:	interrupt for the GPIO device
  * @p_data:	pointer to platform data
  * @context:	context registers
+ * @dirlock:	lock used for direction in/out synchronization
  */
 struct zynq_gpio {
 	struct gpio_chip chip;
@@ -124,6 +126,7 @@ struct zynq_gpio {
 	int irq;
 	const struct zynq_platform_data *p_data;
 	struct gpio_regs context;
+	spinlock_t dirlock; /* lock */
 };
 
 /**
@@ -297,6 +300,7 @@ static int zynq_gpio_dir_in(struct gpio_chip *chip, unsigned int pin)
 {
 	u32 reg;
 	unsigned int bank_num, bank_pin_num;
+	unsigned long flags;
 	struct zynq_gpio *gpio = gpiochip_get_data(chip);
 
 	zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
@@ -310,9 +314,11 @@ static int zynq_gpio_dir_in(struct gpio_chip *chip, unsigned int pin)
 		return -EINVAL;
 
 	/* clear the bit in direction mode reg to set the pin as input */
+	spin_lock_irqsave(&gpio->dirlock, flags);
 	reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
 	reg &= ~BIT(bank_pin_num);
 	writel_relaxed(reg, gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
+	spin_unlock_irqrestore(&gpio->dirlock, flags);
 
 	return 0;
 }
@@ -334,11 +340,13 @@ static int zynq_gpio_dir_out(struct gpio_chip *chip, unsigned int pin,
 {
 	u32 reg;
 	unsigned int bank_num, bank_pin_num;
+	unsigned long flags;
 	struct zynq_gpio *gpio = gpiochip_get_data(chip);
 
 	zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
 
 	/* set the GPIO pin as output */
+	spin_lock_irqsave(&gpio->dirlock, flags);
 	reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
 	reg |= BIT(bank_pin_num);
 	writel_relaxed(reg, gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
@@ -347,6 +355,7 @@ static int zynq_gpio_dir_out(struct gpio_chip *chip, unsigned int pin,
 	reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_OUTEN_OFFSET(bank_num));
 	reg |= BIT(bank_pin_num);
 	writel_relaxed(reg, gpio->base_addr + ZYNQ_GPIO_OUTEN_OFFSET(bank_num));
+	spin_unlock_irqrestore(&gpio->dirlock, flags);
 
 	/* set the state of the pin */
 	zynq_gpio_set_value(chip, pin, state);
@@ -885,6 +894,8 @@ static int zynq_gpio_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	spin_lock_init(&gpio->dirlock);
+
 	pm_runtime_set_active(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
 	ret = pm_runtime_get_sync(&pdev->dev);
-- 
2.7.4


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[PATCH V2 2/7] dt-bindings: gpio: Add binding for Versal gpio

[Srinivas Neeli]

From: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>

Add binding for Versal binding.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
---
 Documentation/devicetree/bindings/gpio/gpio-zynq.txt | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/gpio/gpio-zynq.txt b/Documentation/devicetree/bindings/gpio/gpio-zynq.txt
index 4fa4eb5507cd..4806d846c0fc 100644
--- a/Documentation/devicetree/bindings/gpio/gpio-zynq.txt
+++ b/Documentation/devicetree/bindings/gpio/gpio-zynq.txt
@@ -6,7 +6,8 @@ Required properties:
 			  - First cell is the GPIO line number
 			  - Second cell is used to specify optional
 			    parameters (unused)
-- compatible		: Should be "xlnx,zynq-gpio-1.0" or "xlnx,zynqmp-gpio-1.0"
+- compatible		: Should be "xlnx,zynq-gpio-1.0" or
+			  "xlnx,zynqmp-gpio-1.0" or "xlnx,versal-gpio-1.0
 - clocks		: Clock specifier (see clock bindings for details)
 - gpio-controller	: Marks the device node as a GPIO controller.
 - interrupts		: Interrupt specifier (see interrupt bindings for
-- 
2.7.4

[PATCH V2 2/7] dt-bindings: gpio: Add binding for Versal gpio

[Srinivas Neeli]

From: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>

Add binding for Versal binding.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
---
 Documentation/devicetree/bindings/gpio/gpio-zynq.txt | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/gpio/gpio-zynq.txt b/Documentation/devicetree/bindings/gpio/gpio-zynq.txt
index 4fa4eb5507cd..4806d846c0fc 100644
--- a/Documentation/devicetree/bindings/gpio/gpio-zynq.txt
+++ b/Documentation/devicetree/bindings/gpio/gpio-zynq.txt
@@ -6,7 +6,8 @@ Required properties:
 			  - First cell is the GPIO line number
 			  - Second cell is used to specify optional
 			    parameters (unused)
-- compatible		: Should be "xlnx,zynq-gpio-1.0" or "xlnx,zynqmp-gpio-1.0"
+- compatible		: Should be "xlnx,zynq-gpio-1.0" or
+			  "xlnx,zynqmp-gpio-1.0" or "xlnx,versal-gpio-1.0
 - clocks		: Clock specifier (see clock bindings for details)
 - gpio-controller	: Marks the device node as a GPIO controller.
 - interrupts		: Interrupt specifier (see interrupt bindings for
-- 
2.7.4


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[PATCH V2 3/7] devicetree-binding: Add pmc gpio node

[Srinivas Neeli]

From: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>

Add the pmc gpio node to the device tree.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
---
 Documentation/devicetree/bindings/gpio/gpio-zynq.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/gpio/gpio-zynq.txt b/Documentation/devicetree/bindings/gpio/gpio-zynq.txt
index 4806d846c0fc..f693e82b4c0f 100644
--- a/Documentation/devicetree/bindings/gpio/gpio-zynq.txt
+++ b/Documentation/devicetree/bindings/gpio/gpio-zynq.txt
@@ -8,6 +8,7 @@ Required properties:
 			    parameters (unused)
 - compatible		: Should be "xlnx,zynq-gpio-1.0" or
 			  "xlnx,zynqmp-gpio-1.0" or "xlnx,versal-gpio-1.0
+			  or "xlnx,pmc-gpio-1.0
 - clocks		: Clock specifier (see clock bindings for details)
 - gpio-controller	: Marks the device node as a GPIO controller.
 - interrupts		: Interrupt specifier (see interrupt bindings for
-- 
2.7.4

[PATCH V2 3/7] devicetree-binding: Add pmc gpio node

[Srinivas Neeli]

From: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>

Add the pmc gpio node to the device tree.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
---
 Documentation/devicetree/bindings/gpio/gpio-zynq.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/gpio/gpio-zynq.txt b/Documentation/devicetree/bindings/gpio/gpio-zynq.txt
index 4806d846c0fc..f693e82b4c0f 100644
--- a/Documentation/devicetree/bindings/gpio/gpio-zynq.txt
+++ b/Documentation/devicetree/bindings/gpio/gpio-zynq.txt
@@ -8,6 +8,7 @@ Required properties:
 			    parameters (unused)
 - compatible		: Should be "xlnx,zynq-gpio-1.0" or
 			  "xlnx,zynqmp-gpio-1.0" or "xlnx,versal-gpio-1.0
+			  or "xlnx,pmc-gpio-1.0
 - clocks		: Clock specifier (see clock bindings for details)
 - gpio-controller	: Marks the device node as a GPIO controller.
 - interrupts		: Interrupt specifier (see interrupt bindings for
-- 
2.7.4


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[PATCH V2 4/7] gpio: zynq: Add Versal support

[Srinivas Neeli]

From: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>

Add Versal support in gpio.
Only bank 0 and 3 are connected to the Multiplexed Input output pins.
Bank 0 to mio and bank3 to fabric Multiplexed input output pins.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
---
Versal devices are the industry's first adaptive compute acceleration platforms.
https://www.xilinx.com/support/documentation/data_sheets/ds950-versal-overview.pdf

On the Versal platform, we are using two customized GPIO controllers(IP) which were used in Zynq/ZynqMp platform.
One of them present in the Platform Management Controller(PMC) block and other in Processing System(PS) block.

In PMC_GPIO only Bank0,1,3 & 4 are enabled and in PS_GPIO only Bank 0 & 3 are enabled.

You can find more details of GPIO IP in ZynqMP TRM General Purpose I/O(Chapter-27).
https://www.xilinx.com/support/documentation/user_guides/ug1085-zynq-ultrascale-trm.pdf
---
 drivers/gpio/gpio-zynq.c | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-zynq.c b/drivers/gpio/gpio-zynq.c
index fb93b35ab19e..9ac69144a0eb 100644
--- a/drivers/gpio/gpio-zynq.c
+++ b/drivers/gpio/gpio-zynq.c
@@ -22,6 +22,8 @@
 /* Maximum banks */
 #define ZYNQ_GPIO_MAX_BANK	4
 #define ZYNQMP_GPIO_MAX_BANK	6
+#define VERSAL_GPIO_MAX_BANK	4
+#define VERSAL_UNUSED_BANKS	2
 
 #define ZYNQ_GPIO_BANK0_NGPIO	32
 #define ZYNQ_GPIO_BANK1_NGPIO	22
@@ -96,6 +98,7 @@
 /* set to differentiate zynq from zynqmp, 0=zynqmp, 1=zynq */
 #define ZYNQ_GPIO_QUIRK_IS_ZYNQ	BIT(0)
 #define GPIO_QUIRK_DATA_RO_BUG	BIT(1)
+#define GPIO_QUIRK_VERSAL	BIT(2)
 
 struct gpio_regs {
 	u32 datamsw[ZYNQMP_GPIO_MAX_BANK];
@@ -199,6 +202,8 @@ static inline void zynq_gpio_get_bank_pin(unsigned int pin_num,
 					gpio->p_data->bank_min[bank];
 			return;
 		}
+		if (gpio->p_data->quirks & GPIO_QUIRK_VERSAL)
+			bank = bank + VERSAL_UNUSED_BANKS;
 	}
 
 	/* default */
@@ -656,6 +661,8 @@ static void zynq_gpio_irqhandler(struct irq_desc *desc)
 		int_enb = readl_relaxed(gpio->base_addr +
 					ZYNQ_GPIO_INTMASK_OFFSET(bank_num));
 		zynq_gpio_handle_bank_irq(gpio, bank_num, int_sts & ~int_enb);
+		if (gpio->p_data->quirks & GPIO_QUIRK_VERSAL)
+			bank_num = bank_num + VERSAL_UNUSED_BANKS;
 	}
 
 	chained_irq_exit(irqchip, desc);
@@ -685,6 +692,8 @@ static void zynq_gpio_save_context(struct zynq_gpio *gpio)
 		gpio->context.int_any[bank_num] =
 				readl_relaxed(gpio->base_addr +
 				ZYNQ_GPIO_INTANY_OFFSET(bank_num));
+		if (gpio->p_data->quirks & GPIO_QUIRK_VERSAL)
+			bank_num = bank_num + VERSAL_UNUSED_BANKS;
 	}
 }
 
@@ -716,6 +725,8 @@ static void zynq_gpio_restore_context(struct zynq_gpio *gpio)
 		writel_relaxed(~(gpio->context.int_en[bank_num]),
 			       gpio->base_addr +
 			       ZYNQ_GPIO_INTEN_OFFSET(bank_num));
+		if (gpio->p_data->quirks & GPIO_QUIRK_VERSAL)
+			bank_num = bank_num + VERSAL_UNUSED_BANKS;
 	}
 }
 
@@ -787,6 +798,17 @@ static const struct dev_pm_ops zynq_gpio_dev_pm_ops = {
 			   zynq_gpio_runtime_resume, NULL)
 };
 
+static const struct zynq_platform_data versal_gpio_def = {
+	.label = "versal_gpio",
+	.quirks = GPIO_QUIRK_VERSAL,
+	.ngpio = 58,
+	.max_bank = VERSAL_GPIO_MAX_BANK,
+	.bank_min[0] = 0,
+	.bank_max[0] = 25, /* 0 to 25 are connected to MIOs (26 pins) */
+	.bank_min[3] = 26,
+	.bank_max[3] = 57, /* Bank 3 is connected to FMIOs (32 pins) */
+};
+
 static const struct zynq_platform_data zynqmp_gpio_def = {
 	.label = "zynqmp_gpio",
 	.quirks = GPIO_QUIRK_DATA_RO_BUG,
@@ -824,6 +846,7 @@ static const struct zynq_platform_data zynq_gpio_def = {
 static const struct of_device_id zynq_gpio_of_match[] = {
 	{ .compatible = "xlnx,zynq-gpio-1.0", .data = &zynq_gpio_def },
 	{ .compatible = "xlnx,zynqmp-gpio-1.0", .data = &zynqmp_gpio_def },
+	{ .compatible = "xlnx,versal-gpio-1.0", .data = &versal_gpio_def },
 	{ /* end of table */ }
 };
 MODULE_DEVICE_TABLE(of, zynq_gpio_of_match);
@@ -903,9 +926,12 @@ static int zynq_gpio_probe(struct platform_device *pdev)
 		goto err_pm_dis;
 
 	/* disable interrupts for all banks */
-	for (bank_num = 0; bank_num < gpio->p_data->max_bank; bank_num++)
+	for (bank_num = 0; bank_num < gpio->p_data->max_bank; bank_num++) {
 		writel_relaxed(ZYNQ_GPIO_IXR_DISABLE_ALL, gpio->base_addr +
 			       ZYNQ_GPIO_INTDIS_OFFSET(bank_num));
+		if (gpio->p_data->quirks & GPIO_QUIRK_VERSAL)
+			bank_num = bank_num + VERSAL_UNUSED_BANKS;
+	}
 
 	/* Set up the GPIO irqchip */
 	girq = &chip->irq;
-- 
2.7.4

[PATCH V2 4/7] gpio: zynq: Add Versal support

[Srinivas Neeli]

From: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>

Add Versal support in gpio.
Only bank 0 and 3 are connected to the Multiplexed Input output pins.
Bank 0 to mio and bank3 to fabric Multiplexed input output pins.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
---
Versal devices are the industry's first adaptive compute acceleration platforms.
https://www.xilinx.com/support/documentation/data_sheets/ds950-versal-overview.pdf

On the Versal platform, we are using two customized GPIO controllers(IP) which were used in Zynq/ZynqMp platform.
One of them present in the Platform Management Controller(PMC) block and other in Processing System(PS) block.

In PMC_GPIO only Bank0,1,3 & 4 are enabled and in PS_GPIO only Bank 0 & 3 are enabled.

You can find more details of GPIO IP in ZynqMP TRM General Purpose I/O(Chapter-27).
https://www.xilinx.com/support/documentation/user_guides/ug1085-zynq-ultrascale-trm.pdf
---
 drivers/gpio/gpio-zynq.c | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-zynq.c b/drivers/gpio/gpio-zynq.c
index fb93b35ab19e..9ac69144a0eb 100644
--- a/drivers/gpio/gpio-zynq.c
+++ b/drivers/gpio/gpio-zynq.c
@@ -22,6 +22,8 @@
 /* Maximum banks */
 #define ZYNQ_GPIO_MAX_BANK	4
 #define ZYNQMP_GPIO_MAX_BANK	6
+#define VERSAL_GPIO_MAX_BANK	4
+#define VERSAL_UNUSED_BANKS	2
 
 #define ZYNQ_GPIO_BANK0_NGPIO	32
 #define ZYNQ_GPIO_BANK1_NGPIO	22
@@ -96,6 +98,7 @@
 /* set to differentiate zynq from zynqmp, 0=zynqmp, 1=zynq */
 #define ZYNQ_GPIO_QUIRK_IS_ZYNQ	BIT(0)
 #define GPIO_QUIRK_DATA_RO_BUG	BIT(1)
+#define GPIO_QUIRK_VERSAL	BIT(2)
 
 struct gpio_regs {
 	u32 datamsw[ZYNQMP_GPIO_MAX_BANK];
@@ -199,6 +202,8 @@ static inline void zynq_gpio_get_bank_pin(unsigned int pin_num,
 					gpio->p_data->bank_min[bank];
 			return;
 		}
+		if (gpio->p_data->quirks & GPIO_QUIRK_VERSAL)
+			bank = bank + VERSAL_UNUSED_BANKS;
 	}
 
 	/* default */
@@ -656,6 +661,8 @@ static void zynq_gpio_irqhandler(struct irq_desc *desc)
 		int_enb = readl_relaxed(gpio->base_addr +
 					ZYNQ_GPIO_INTMASK_OFFSET(bank_num));
 		zynq_gpio_handle_bank_irq(gpio, bank_num, int_sts & ~int_enb);
+		if (gpio->p_data->quirks & GPIO_QUIRK_VERSAL)
+			bank_num = bank_num + VERSAL_UNUSED_BANKS;
 	}
 
 	chained_irq_exit(irqchip, desc);
@@ -685,6 +692,8 @@ static void zynq_gpio_save_context(struct zynq_gpio *gpio)
 		gpio->context.int_any[bank_num] =
 				readl_relaxed(gpio->base_addr +
 				ZYNQ_GPIO_INTANY_OFFSET(bank_num));
+		if (gpio->p_data->quirks & GPIO_QUIRK_VERSAL)
+			bank_num = bank_num + VERSAL_UNUSED_BANKS;
 	}
 }
 
@@ -716,6 +725,8 @@ static void zynq_gpio_restore_context(struct zynq_gpio *gpio)
 		writel_relaxed(~(gpio->context.int_en[bank_num]),
 			       gpio->base_addr +
 			       ZYNQ_GPIO_INTEN_OFFSET(bank_num));
+		if (gpio->p_data->quirks & GPIO_QUIRK_VERSAL)
+			bank_num = bank_num + VERSAL_UNUSED_BANKS;
 	}
 }
 
@@ -787,6 +798,17 @@ static const struct dev_pm_ops zynq_gpio_dev_pm_ops = {
 			   zynq_gpio_runtime_resume, NULL)
 };
 
+static const struct zynq_platform_data versal_gpio_def = {
+	.label = "versal_gpio",
+	.quirks = GPIO_QUIRK_VERSAL,
+	.ngpio = 58,
+	.max_bank = VERSAL_GPIO_MAX_BANK,
+	.bank_min[0] = 0,
+	.bank_max[0] = 25, /* 0 to 25 are connected to MIOs (26 pins) */
+	.bank_min[3] = 26,
+	.bank_max[3] = 57, /* Bank 3 is connected to FMIOs (32 pins) */
+};
+
 static const struct zynq_platform_data zynqmp_gpio_def = {
 	.label = "zynqmp_gpio",
 	.quirks = GPIO_QUIRK_DATA_RO_BUG,
@@ -824,6 +846,7 @@ static const struct zynq_platform_data zynq_gpio_def = {
 static const struct of_device_id zynq_gpio_of_match[] = {
 	{ .compatible = "xlnx,zynq-gpio-1.0", .data = &zynq_gpio_def },
 	{ .compatible = "xlnx,zynqmp-gpio-1.0", .data = &zynqmp_gpio_def },
+	{ .compatible = "xlnx,versal-gpio-1.0", .data = &versal_gpio_def },
 	{ /* end of table */ }
 };
 MODULE_DEVICE_TABLE(of, zynq_gpio_of_match);
@@ -903,9 +926,12 @@ static int zynq_gpio_probe(struct platform_device *pdev)
 		goto err_pm_dis;
 
 	/* disable interrupts for all banks */
-	for (bank_num = 0; bank_num < gpio->p_data->max_bank; bank_num++)
+	for (bank_num = 0; bank_num < gpio->p_data->max_bank; bank_num++) {
 		writel_relaxed(ZYNQ_GPIO_IXR_DISABLE_ALL, gpio->base_addr +
 			       ZYNQ_GPIO_INTDIS_OFFSET(bank_num));
+		if (gpio->p_data->quirks & GPIO_QUIRK_VERSAL)
+			bank_num = bank_num + VERSAL_UNUSED_BANKS;
+	}
 
 	/* Set up the GPIO irqchip */
 	girq = &chip->irq;
-- 
2.7.4


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Re: [PATCH V2 4/7] gpio: zynq: Add Versal support

[Bartosz Golaszewski]

pt., 14 lut 2020 o 08:16 Srinivas Neeli <srinivas.neeli@xilinx.com> napisał(a):
>
> From: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
>
> Add Versal support in gpio.
> Only bank 0 and 3 are connected to the Multiplexed Input output pins.
> Bank 0 to mio and bank3 to fabric Multiplexed input output pins.
>
> Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
> ---
> Versal devices are the industry's first adaptive compute acceleration platforms.
> https://www.xilinx.com/support/documentation/data_sheets/ds950-versal-overview.pdf
>

Ok so you added the description, but why isn't it part of the commit
message? We want to make this information part of the git history -
otherwise it'll get lost on the mailing list.

Bart

Re: [PATCH V2 4/7] gpio: zynq: Add Versal support

[Bartosz Golaszewski]

pt., 14 lut 2020 o 08:16 Srinivas Neeli <srinivas.neeli@xilinx.com> napisał(a):
>
> From: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
>
> Add Versal support in gpio.
> Only bank 0 and 3 are connected to the Multiplexed Input output pins.
> Bank 0 to mio and bank3 to fabric Multiplexed input output pins.
>
> Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
> ---
> Versal devices are the industry's first adaptive compute acceleration platforms.
> https://www.xilinx.com/support/documentation/data_sheets/ds950-versal-overview.pdf
>

Ok so you added the description, but why isn't it part of the commit
message? We want to make this information part of the git history -
otherwise it'll get lost on the mailing list.

Bart

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[PATCH V2 5/7] gpio: zynq: Disable the irq if it is not a wakeup source

[Srinivas Neeli]

From: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>

If gpio is not set to wake disable the interrupt. ATF set all slaves with
enabled interrupts as wakeup sources and if gpio is used in r5 then it
wakes up linux.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
---
 drivers/gpio/gpio-zynq.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpio/gpio-zynq.c b/drivers/gpio/gpio-zynq.c
index 9ac69144a0eb..b6261a3aec55 100644
--- a/drivers/gpio/gpio-zynq.c
+++ b/drivers/gpio/gpio-zynq.c
@@ -735,6 +735,9 @@ static int __maybe_unused zynq_gpio_suspend(struct device *dev)
 	struct zynq_gpio *gpio = dev_get_drvdata(dev);
 	struct irq_data *data = irq_get_irq_data(gpio->irq);
 
+	if (!device_may_wakeup(dev))
+		disable_irq(gpio->irq);
+
 	if (!irqd_is_wakeup_set(data)) {
 		zynq_gpio_save_context(gpio);
 		return pm_runtime_force_suspend(dev);
@@ -749,6 +752,9 @@ static int __maybe_unused zynq_gpio_resume(struct device *dev)
 	struct irq_data *data = irq_get_irq_data(gpio->irq);
 	int ret;
 
+	if (!device_may_wakeup(dev))
+		enable_irq(gpio->irq);
+
 	if (!irqd_is_wakeup_set(data)) {
 		ret = pm_runtime_force_resume(dev);
 		zynq_gpio_restore_context(gpio);
@@ -956,6 +962,8 @@ static int zynq_gpio_probe(struct platform_device *pdev)
 		goto err_pm_put;
 	}
 
+	irq_set_status_flags(gpio->irq, IRQ_DISABLE_UNLAZY);
+	device_init_wakeup(&pdev->dev, 1);
 	pm_runtime_put(&pdev->dev);
 
 	return 0;
-- 
2.7.4

[PATCH V2 5/7] gpio: zynq: Disable the irq if it is not a wakeup source

[Srinivas Neeli]

From: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>

If gpio is not set to wake disable the interrupt. ATF set all slaves with
enabled interrupts as wakeup sources and if gpio is used in r5 then it
wakes up linux.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
---
 drivers/gpio/gpio-zynq.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpio/gpio-zynq.c b/drivers/gpio/gpio-zynq.c
index 9ac69144a0eb..b6261a3aec55 100644
--- a/drivers/gpio/gpio-zynq.c
+++ b/drivers/gpio/gpio-zynq.c
@@ -735,6 +735,9 @@ static int __maybe_unused zynq_gpio_suspend(struct device *dev)
 	struct zynq_gpio *gpio = dev_get_drvdata(dev);
 	struct irq_data *data = irq_get_irq_data(gpio->irq);
 
+	if (!device_may_wakeup(dev))
+		disable_irq(gpio->irq);
+
 	if (!irqd_is_wakeup_set(data)) {
 		zynq_gpio_save_context(gpio);
 		return pm_runtime_force_suspend(dev);
@@ -749,6 +752,9 @@ static int __maybe_unused zynq_gpio_resume(struct device *dev)
 	struct irq_data *data = irq_get_irq_data(gpio->irq);
 	int ret;
 
+	if (!device_may_wakeup(dev))
+		enable_irq(gpio->irq);
+
 	if (!irqd_is_wakeup_set(data)) {
 		ret = pm_runtime_force_resume(dev);
 		zynq_gpio_restore_context(gpio);
@@ -956,6 +962,8 @@ static int zynq_gpio_probe(struct platform_device *pdev)
 		goto err_pm_put;
 	}
 
+	irq_set_status_flags(gpio->irq, IRQ_DISABLE_UNLAZY);
+	device_init_wakeup(&pdev->dev, 1);
 	pm_runtime_put(&pdev->dev);
 
 	return 0;
-- 
2.7.4


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[PATCH V2 6/7] gpio: zynq: Add pmc gpio support

[Srinivas Neeli]

From: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>

Add PMC gpio support.
Only bank 0,1, 3 and 4 are connected to the multiplexed Input output
pins. Bank 0 and 1 to mio and bank 3 and 4 to extended multiplexed input
output pins.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
---
Versal devices are the industry's first adaptive compute acceleration platforms.
https://www.xilinx.com/support/documentation/data_sheets/ds950-versal-overview.pdf

On the Versal platform, we are using two customized GPIO controllers(IP) which were used in Zynq/ZynqMp platform.
One of them present in the Platform Management Controller(PMC) block and other in Processing System(PS) block.

In PMC_GPIO only Bank0,1,3 & 4 are enabled and in PS_GPIO only Bank 0 & 3 are enabled.

You can find more details of GPIO IP in ZynqMP TRM General Purpose I/O(Chapter-27).
https://www.xilinx.com/support/documentation/user_guides/ug1085-zynq-ultrascale-trm.pdf
---
 drivers/gpio/gpio-zynq.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/gpio/gpio-zynq.c b/drivers/gpio/gpio-zynq.c
index b6261a3aec55..2ddb59b242e7 100644
--- a/drivers/gpio/gpio-zynq.c
+++ b/drivers/gpio/gpio-zynq.c
@@ -23,6 +23,7 @@
 #define ZYNQ_GPIO_MAX_BANK	4
 #define ZYNQMP_GPIO_MAX_BANK	6
 #define VERSAL_GPIO_MAX_BANK	4
+#define PMC_GPIO_MAX_BANK	5
 #define VERSAL_UNUSED_BANKS	2
 
 #define ZYNQ_GPIO_BANK0_NGPIO	32
@@ -815,6 +816,20 @@ static const struct zynq_platform_data versal_gpio_def = {
 	.bank_max[3] = 57, /* Bank 3 is connected to FMIOs (32 pins) */
 };
 
+static const struct zynq_platform_data pmc_gpio_def = {
+	.label = "pmc_gpio",
+	.ngpio = 116,
+	.max_bank = PMC_GPIO_MAX_BANK,
+	.bank_min[0] = 0,
+	.bank_max[0] = 25, /* 0 to 25 are connected to MIOs (26 pins) */
+	.bank_min[1] = 26,
+	.bank_max[1] = 51, /* Bank 1 are connected to MIOs (26 pins) */
+	.bank_min[3] = 52,
+	.bank_max[3] = 83, /* Bank 3 is connected to EMIOs (32 pins) */
+	.bank_min[4] = 84,
+	.bank_max[4] = 115, /* Bank 4 is connected to EMIOs (32 pins) */
+};
+
 static const struct zynq_platform_data zynqmp_gpio_def = {
 	.label = "zynqmp_gpio",
 	.quirks = GPIO_QUIRK_DATA_RO_BUG,
@@ -853,6 +868,7 @@ static const struct of_device_id zynq_gpio_of_match[] = {
 	{ .compatible = "xlnx,zynq-gpio-1.0", .data = &zynq_gpio_def },
 	{ .compatible = "xlnx,zynqmp-gpio-1.0", .data = &zynqmp_gpio_def },
 	{ .compatible = "xlnx,versal-gpio-1.0", .data = &versal_gpio_def },
+	{ .compatible = "xlnx,pmc-gpio-1.0", .data = &pmc_gpio_def },
 	{ /* end of table */ }
 };
 MODULE_DEVICE_TABLE(of, zynq_gpio_of_match);
-- 
2.7.4

[PATCH V2 6/7] gpio: zynq: Add pmc gpio support

[Srinivas Neeli]

From: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>

Add PMC gpio support.
Only bank 0,1, 3 and 4 are connected to the multiplexed Input output
pins. Bank 0 and 1 to mio and bank 3 and 4 to extended multiplexed input
output pins.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
---
Versal devices are the industry's first adaptive compute acceleration platforms.
https://www.xilinx.com/support/documentation/data_sheets/ds950-versal-overview.pdf

On the Versal platform, we are using two customized GPIO controllers(IP) which were used in Zynq/ZynqMp platform.
One of them present in the Platform Management Controller(PMC) block and other in Processing System(PS) block.

In PMC_GPIO only Bank0,1,3 & 4 are enabled and in PS_GPIO only Bank 0 & 3 are enabled.

You can find more details of GPIO IP in ZynqMP TRM General Purpose I/O(Chapter-27).
https://www.xilinx.com/support/documentation/user_guides/ug1085-zynq-ultrascale-trm.pdf
---
 drivers/gpio/gpio-zynq.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/gpio/gpio-zynq.c b/drivers/gpio/gpio-zynq.c
index b6261a3aec55..2ddb59b242e7 100644
--- a/drivers/gpio/gpio-zynq.c
+++ b/drivers/gpio/gpio-zynq.c
@@ -23,6 +23,7 @@
 #define ZYNQ_GPIO_MAX_BANK	4
 #define ZYNQMP_GPIO_MAX_BANK	6
 #define VERSAL_GPIO_MAX_BANK	4
+#define PMC_GPIO_MAX_BANK	5
 #define VERSAL_UNUSED_BANKS	2
 
 #define ZYNQ_GPIO_BANK0_NGPIO	32
@@ -815,6 +816,20 @@ static const struct zynq_platform_data versal_gpio_def = {
 	.bank_max[3] = 57, /* Bank 3 is connected to FMIOs (32 pins) */
 };
 
+static const struct zynq_platform_data pmc_gpio_def = {
+	.label = "pmc_gpio",
+	.ngpio = 116,
+	.max_bank = PMC_GPIO_MAX_BANK,
+	.bank_min[0] = 0,
+	.bank_max[0] = 25, /* 0 to 25 are connected to MIOs (26 pins) */
+	.bank_min[1] = 26,
+	.bank_max[1] = 51, /* Bank 1 are connected to MIOs (26 pins) */
+	.bank_min[3] = 52,
+	.bank_max[3] = 83, /* Bank 3 is connected to EMIOs (32 pins) */
+	.bank_min[4] = 84,
+	.bank_max[4] = 115, /* Bank 4 is connected to EMIOs (32 pins) */
+};
+
 static const struct zynq_platform_data zynqmp_gpio_def = {
 	.label = "zynqmp_gpio",
 	.quirks = GPIO_QUIRK_DATA_RO_BUG,
@@ -853,6 +868,7 @@ static const struct of_device_id zynq_gpio_of_match[] = {
 	{ .compatible = "xlnx,zynq-gpio-1.0", .data = &zynq_gpio_def },
 	{ .compatible = "xlnx,zynqmp-gpio-1.0", .data = &zynqmp_gpio_def },
 	{ .compatible = "xlnx,versal-gpio-1.0", .data = &versal_gpio_def },
+	{ .compatible = "xlnx,pmc-gpio-1.0", .data = &pmc_gpio_def },
 	{ /* end of table */ }
 };
 MODULE_DEVICE_TABLE(of, zynq_gpio_of_match);
-- 
2.7.4


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[PATCH V2 7/7] gpio: zynq: Remove error prints in EPROBE_DEFER

[Srinivas Neeli]

From: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>

In case of probe is deferred do not print the errors.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
---
 drivers/gpio/gpio-zynq.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-zynq.c b/drivers/gpio/gpio-zynq.c
index 2ddb59b242e7..53d1387592fd 100644
--- a/drivers/gpio/gpio-zynq.c
+++ b/drivers/gpio/gpio-zynq.c
@@ -930,7 +930,8 @@ static int zynq_gpio_probe(struct platform_device *pdev)
 	/* Retrieve GPIO clock */
 	gpio->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(gpio->clk)) {
-		dev_err(&pdev->dev, "input clock not found.\n");
+		if (PTR_ERR(gpio->clk) != -EPROBE_DEFER)
+			dev_err(&pdev->dev, "input clock not found.\n");
 		return PTR_ERR(gpio->clk);
 	}
 	ret = clk_prepare_enable(gpio->clk);
-- 
2.7.4

[PATCH V2 7/7] gpio: zynq: Remove error prints in EPROBE_DEFER

[Srinivas Neeli]

From: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>

In case of probe is deferred do not print the errors.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
---
 drivers/gpio/gpio-zynq.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-zynq.c b/drivers/gpio/gpio-zynq.c
index 2ddb59b242e7..53d1387592fd 100644
--- a/drivers/gpio/gpio-zynq.c
+++ b/drivers/gpio/gpio-zynq.c
@@ -930,7 +930,8 @@ static int zynq_gpio_probe(struct platform_device *pdev)
 	/* Retrieve GPIO clock */
 	gpio->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(gpio->clk)) {
-		dev_err(&pdev->dev, "input clock not found.\n");
+		if (PTR_ERR(gpio->clk) != -EPROBE_DEFER)
+			dev_err(&pdev->dev, "input clock not found.\n");
 		return PTR_ERR(gpio->clk);
 	}
 	ret = clk_prepare_enable(gpio->clk);
-- 
2.7.4


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