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

From: Srinivas Neeli
Date: Fri Feb 14 2020 - 02:16:14 EST


From: Shubhrajyoti Datta <shubhrajyoti.datta@xxxxxxxxxx>

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@xxxxxxxxxx>
Signed-off-by: Michal Simek <michal.simek@xxxxxxxxxx>
---
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