VeriSilicon APB v0.2 is a custom GPIO design provided from VeriSilicon
Microelectronics. It has 32 input/output ports which can be
configured as edge or level triggered interrupts. It also provides
a de-bounce feature.
Signed-off-by: Nikolaos Pasaloukos <nikolaos.pasaloukos@xxxxxxxxxx>
---
MAINTAINERS | 10 ++
drivers/gpio/Kconfig | 9 ++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-vsiapb.c | 284 +++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 304 insertions(+)
diff --git a/MAINTAINERS b/MAINTAINERS
index eb75c95f6c455516f7b1c8b3a39ddded5b38e0a9..ad75f7df37d8d63e14846e659666230b137a7ea1 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -25343,6 +25343,16 @@ S: Maintained
F: Documentation/networking/vrf.rst
F: drivers/net/vrf.c
+VSI APB GPIO DRIVER
+M: James Cowgill <james.cowgill@xxxxxxxxxx>
+M: Matt Redfearn <matt.redfearn@xxxxxxxxxx>
+M: Neil Jones <neil.jones@xxxxxxxxxx>
+M: Nikolaos Pasaloukos <nikolaos.pasaloukos@xxxxxxxxxx>
+L: linux-gpio@xxxxxxxxxxxxxxx
+S: Maintained
+F: Documentation/devicetree/bindings/gpio/vsi,apb-gpio.yaml
+F: drivers/gpio/gpio-vsiapb.c
+
VSPRINTF
M: Petr Mladek <pmladek@xxxxxxxx>
M: Steven Rostedt <rostedt@xxxxxxxxxxx>
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index add5ad29a673c09082a913cb2404073b2034af48..654603f790c7db2481265c2ab7d90eec4be79856 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -769,6 +769,15 @@ config GPIO_VISCONTI
help
Say yes here to support GPIO on Tohisba Visconti.
+config GPIO_VSIAPB
+ tristate "Verisilicon APB GPIO support"
+ depends on OF_GPIO
+ select GPIO_GENERIC
+ select GPIOLIB_IRQCHIP
+ select IRQ_DOMAIN_HIERARCHY
+ help
+ Say Y or M here to add support for the Verisilicon APB GPIO device.
+
config GPIO_WCD934X
tristate "Qualcomm Technologies Inc WCD9340/WCD9341 GPIO controller driver"
depends on MFD_WCD934X && OF_GPIO
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index af3ba4d81b583842893ea69e677fbe2abf31bc7b..f0f2dd711c84b9159418154419664c7c1f28340f 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -189,6 +189,7 @@ obj-$(CONFIG_GPIO_VIPERBOARD) += gpio-viperboard.o
obj-$(CONFIG_GPIO_VIRTUSER) += gpio-virtuser.o
obj-$(CONFIG_GPIO_VIRTIO) += gpio-virtio.o
obj-$(CONFIG_GPIO_VISCONTI) += gpio-visconti.o
+obj-$(CONFIG_GPIO_VSIAPB) += gpio-vsiapb.o
obj-$(CONFIG_GPIO_VX855) += gpio-vx855.o
obj-$(CONFIG_GPIO_WCD934X) += gpio-wcd934x.o
obj-$(CONFIG_GPIO_WHISKEY_COVE) += gpio-wcove.o
diff --git a/drivers/gpio/gpio-vsiapb.c b/drivers/gpio/gpio-vsiapb.c
new file mode 100644
index 0000000000000000000000000000000000000000..dab7c579235058724a9b3f07ce302eed5e4f5fce
--- /dev/null
+++ b/drivers/gpio/gpio-vsiapb.c
@@ -0,0 +1,284 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2019 VeriSilicon Limited.
+ * Copyright (C) 2025 Blaize, Inc.
+ */
+
+#include <linux/errno.h>
+#include <linux/gpio/driver.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+
+#define GPIO_DIR_REG 0x00
+#define GPIO_CTRL_REG 0x04
+#define GPIO_SET_REG 0x08
+#define GPIO_CLR_REG 0x0C
+#define GPIO_ODATA_REG 0x10
+#define GPIO_IDATA_REG 0x14
+#define GPIO_IEN_REG 0x18
+#define GPIO_IS_REG 0x1C
+#define GPIO_IBE_REG 0x20
+#define GPIO_IEV_REG 0x24
+#define GPIO_RIS_REG 0x28
+#define GPIO_IM_REG 0x2C
+#define GPIO_MIS_REG 0x30
+#define GPIO_IC_REG 0x34
+#define GPIO_DB_REG 0x38
+#define GPIO_DFG_REG 0x3C
+
+#define DRIVER_NAME "vsiapb-gpio"
+
+struct vsiapb_gpio {
+ void __iomem *base;
+ struct gpio_chip gc;
+ int irq;
+};
+
+static inline struct vsiapb_gpio *get_vsiapb_from_irq_data(struct irq_data *d)
+{
+ return gpiochip_get_data(irq_data_get_irq_chip_data(d));
+}
+
+static inline struct vsiapb_gpio *get_vsiapb_from_irq_desc(struct irq_desc *d)
+{
+ return gpiochip_get_data(irq_desc_get_handler_data(d));
+}
+
+static inline u32 vsiapb_gpio_read(struct vsiapb_gpio *chip, unsigned int offset)
+{
+ return readl_relaxed(chip->base + offset);
+}
+
+static inline void vsiapb_gpio_write(struct vsiapb_gpio *chip, unsigned int offset, u32 val)
+{
+ writel_relaxed(val, chip->base + offset);
+}
+
+static inline void vsiapb_gpio_rmw(void __iomem *reg, u32 mask, bool set)
+{
+ u32 val = readl_relaxed(reg);
+
+ if (set)
+ val |= mask;
+ else
+ val &= ~mask;
+
+ writel_relaxed(val, reg);
+}
+
+static void vsiapb_gpio_irq_mask(struct irq_data *d)
+{
+ struct vsiapb_gpio *chip = get_vsiapb_from_irq_data(d);
+
+ guard(raw_spinlock_irqsave)(&chip->gc.bgpio_lock);
+ vsiapb_gpio_rmw(chip->base + GPIO_IM_REG, BIT(d->hwirq), 1);
+}
+
+static void vsiapb_gpio_irq_unmask(struct irq_data *d)
+{
+ struct vsiapb_gpio *chip = get_vsiapb_from_irq_data(d);
+
+ guard(raw_spinlock_irqsave)(&chip->gc.bgpio_lock);
+ vsiapb_gpio_rmw(chip->base + GPIO_IM_REG, BIT(d->hwirq), 0);
+}
+
+static void vsiapb_gpio_irq_ack(struct irq_data *d)
+{
+ struct vsiapb_gpio *chip = get_vsiapb_from_irq_data(d);
+
+ vsiapb_gpio_write(chip, GPIO_IC_REG, BIT(d->hwirq));
+}
+
+static void vsiapb_gpio_irq_enable(struct irq_data *d)
+{
+ struct vsiapb_gpio *chip = get_vsiapb_from_irq_data(d);
+
+ gpiochip_enable_irq(&chip->gc, irqd_to_hwirq(d));
+
+ guard(raw_spinlock_irqsave)(&chip->gc.bgpio_lock);
+ vsiapb_gpio_rmw(chip->base + GPIO_DIR_REG, BIT(d->hwirq), 0);
+ vsiapb_gpio_rmw(chip->base + GPIO_IEN_REG, BIT(d->hwirq), 1);
+}
+
+static void vsiapb_gpio_irq_disable(struct irq_data *d)
+{
+ struct vsiapb_gpio *chip = get_vsiapb_from_irq_data(d);
+
+ guard(raw_spinlock_irqsave)(&chip->gc.bgpio_lock);
+ vsiapb_gpio_rmw(chip->base + GPIO_IEN_REG, BIT(d->hwirq), 0);
+ gpiochip_disable_irq(&chip->gc, irqd_to_hwirq(d));
+}
+
+static int vsiapb_gpio_irq_set_type(struct irq_data *d, u32 type)
+{
+ struct vsiapb_gpio *chip = get_vsiapb_from_irq_data(d);
+ u32 edge_level, single_both, fall_rise;
+ int mask = BIT(d->hwirq);
+
+ guard(raw_spinlock_irqsave)(&chip->gc.bgpio_lock);
+ edge_level = vsiapb_gpio_read(chip, GPIO_IS_REG);
+ single_both = vsiapb_gpio_read(chip, GPIO_IBE_REG);
+ fall_rise = vsiapb_gpio_read(chip, GPIO_IEV_REG);
+
+ switch (type) {
+ case IRQ_TYPE_EDGE_BOTH:
+ edge_level &= ~mask;
+ single_both |= mask;
+ break;
+ case IRQ_TYPE_EDGE_RISING:
+ edge_level &= ~mask;
+ single_both &= ~mask;
+ fall_rise |= mask;
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ edge_level &= ~mask;
+ single_both &= ~mask;
+ fall_rise &= ~mask;
+ break;
+ case IRQ_TYPE_LEVEL_HIGH:
+ edge_level |= mask;
+ fall_rise |= mask;
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ edge_level |= mask;
+ fall_rise &= ~mask;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ vsiapb_gpio_write(chip, GPIO_IS_REG, edge_level);
+ vsiapb_gpio_write(chip, GPIO_IBE_REG, single_both);
+ vsiapb_gpio_write(chip, GPIO_IEV_REG, fall_rise);
+
+ if (type & IRQ_TYPE_LEVEL_MASK)
+ irq_set_handler_locked(d, handle_level_irq);
+ else
+ irq_set_handler_locked(d, handle_edge_irq);
+
+ return 0;
+}
+
+static const struct irq_chip vsiapb_gpio_irqchip = {
+ .name = DRIVER_NAME,
+ .irq_ack = vsiapb_gpio_irq_ack,
+ .irq_mask = vsiapb_gpio_irq_mask,
+ .irq_unmask = vsiapb_gpio_irq_unmask,
+ .irq_set_type = vsiapb_gpio_irq_set_type,
+ .irq_enable = vsiapb_gpio_irq_enable,
+ .irq_disable = vsiapb_gpio_irq_disable,
+ .flags = IRQCHIP_IMMUTABLE | IRQCHIP_MASK_ON_SUSPEND,
+ GPIOCHIP_IRQ_RESOURCE_HELPERS,
+};
+
+static void vsiapb_gpio_irqhandler(struct irq_desc *desc)
+{
+ struct vsiapb_gpio *gpio = get_vsiapb_from_irq_desc(desc);
+ struct irq_chip *irqchip = irq_desc_get_chip(desc);
+ unsigned long irq_status;
+ int hwirq = 0;
+
+ chained_irq_enter(irqchip, desc);
+ irq_status = vsiapb_gpio_read(gpio, GPIO_RIS_REG);
+ for_each_set_bit(hwirq, &irq_status, gpio->gc.ngpio)
+ generic_handle_domain_irq(gpio->gc.irq.domain, hwirq);
+
+ chained_irq_exit(irqchip, desc);
+}
+
+static int vsiapb_gpio_set_debounce(struct gpio_chip *gc, unsigned int offset,
+ unsigned int debounce)
+{
+ struct vsiapb_gpio *chip = gpiochip_get_data(gc);
+
+ guard(raw_spinlock_irqsave)(&chip->gc.bgpio_lock);
+ vsiapb_gpio_rmw(chip->base + GPIO_DB_REG, BIT(offset), debounce);
+
+ return 0;
+}
+
+static int vsiapb_gpio_set_config(struct gpio_chip *gc, unsigned int offset, unsigned long config)
+{
+ u32 debounce;
+
+ if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
+ return -ENOTSUPP;
+
+ debounce = pinconf_to_config_argument(config);
+ return vsiapb_gpio_set_debounce(gc, offset, debounce);
+}
+
+static int vsiapb_gpio_probe(struct platform_device *pdev)
+{
+ struct device_node *node = pdev->dev.of_node;
+ struct vsiapb_gpio *chip;
+ struct gpio_chip *gc;
+ int ret;
+
+ chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(chip->base))
+ return PTR_ERR(chip->base);
+
+ ret = bgpio_init(&chip->gc, &pdev->dev, 4, chip->base + GPIO_IDATA_REG,
+ chip->base + GPIO_SET_REG, chip->base + GPIO_CLR_REG,
+ chip->base + GPIO_DIR_REG, NULL, 0);
+ if (ret)
+ return dev_err_probe(&pdev->dev, ret, "Failed to register generic gpio\n");
+
+ /* configure the gpio chip */
+ gc = &chip->gc;
+ gc->owner = THIS_MODULE;
+ gc->set_config = vsiapb_gpio_set_config;
+
+ if (of_property_read_bool(node, "interrupt-controller")) {
+ struct gpio_irq_chip *girq;
+
+ chip->irq = platform_get_irq(pdev, 0);
+ if (chip->irq < 0)
+ return chip->irq;
+
+ girq = &gc->irq;
+ gpio_irq_chip_set_chip(girq, &vsiapb_gpio_irqchip);
+ girq->parent_handler = vsiapb_gpio_irqhandler;
+ girq->num_parents = 1;
+ girq->parents = devm_kcalloc(&pdev->dev, 1, sizeof(*girq->parents), GFP_KERNEL);
+ if (!girq->parents)
+ return -ENOMEM;
+
+ girq->parents[0] = chip->irq;
+ girq->default_type = IRQ_TYPE_NONE;
+ }
+
+ return devm_gpiochip_add_data(&pdev->dev, gc, chip);
+}
+
+static const struct of_device_id vsiapb_of_match[] = {
+ { .compatible = "vsi,apb-gpio-0.2", },
+ { /* Sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, vsiapb_of_match);
+
+static struct platform_driver vsiapb_gpio_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ .of_match_table = of_match_ptr(vsiapb_of_match),
+ },
+ .probe = vsiapb_gpio_probe,
+};
+
+module_platform_driver(vsiapb_gpio_driver);
+
+MODULE_AUTHOR("Nikolaos Pasaloukos <nikolaos.pasaloukos@xxxxxxxxxx>");
+MODULE_DESCRIPTION("Verisilicon APB GPIO driver");
+MODULE_LICENSE("GPL");
--
2.43.0
