[PATCH 07/11] pinctrl: rp1: Implement RaspberryPi RP1 gpio support

Andrea della Porta
2024-08-20T14:41:18Z

The RP1 is an MFD supporting a gpio controller and /pinmux/pinctrl.
Add minimum support for the gpio only portion. The driver is in
pinctrl folder since upcoming patches will add the pinmux/pinctrl
support where the gpio part can be seen as an addition.

Signed-off-by: Andrea della Porta <andrea.porta@suse.com>
---
MAINTAINERS | 1 +
drivers/pinctrl/Kconfig | 10 +
drivers/pinctrl/Makefile | 1 +
drivers/pinctrl/pinctrl-rp1.c | 719 ++++++++++++++++++++++++++++++++++
4 files changed, 731 insertions(+)
create mode 100644 drivers/pinctrl/pinctrl-rp1.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 4ce7b049d67e..67f460c36ea1 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -19122,6 +19122,7 @@ S: Maintained
F: Documentation/devicetree/bindings/clock/raspberrypi,rp1-clocks.yaml
F: Documentation/devicetree/bindings/pinctrl/raspberrypi,rp1-gpio.yaml
F: drivers/clk/clk-rp1.c
+F: drivers/pinctrl/pinctrl-rp1.c
F: include/dt-bindings/clock/rp1.h
F: include/dt-bindings/misc/rp1.h

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index 7e4f93a3bc7a..18bb1a8bd102 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -565,6 +565,16 @@ config PINCTRL_MLXBF3
each pin. This driver can also be built as a module called
pinctrl-mlxbf3.

+config PINCTRL_RP1
+ bool "Pinctrl driver for RP1"
+ select PINMUX
+ select PINCONF
+ select GENERIC_PINCONF
+ select GPIOLIB_IRQCHIP
+ help
+ Enable the gpio and pinctrl/mux driver for RaspberryPi RP1
+ multi function device.
+
source "drivers/pinctrl/actions/Kconfig"
source "drivers/pinctrl/aspeed/Kconfig"
source "drivers/pinctrl/bcm/Kconfig"
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index cc809669405a..f1ca23b563f6 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -45,6 +45,7 @@ obj-$(CONFIG_PINCTRL_PIC32) += pinctrl-pic32.o
obj-$(CONFIG_PINCTRL_PISTACHIO) += pinctrl-pistachio.o
obj-$(CONFIG_PINCTRL_RK805) += pinctrl-rk805.o
obj-$(CONFIG_PINCTRL_ROCKCHIP) += pinctrl-rockchip.o
+obj-$(CONFIG_PINCTRL_RP1) += pinctrl-rp1.o
obj-$(CONFIG_PINCTRL_SCMI) += pinctrl-scmi.o
obj-$(CONFIG_PINCTRL_SINGLE) += pinctrl-single.o
obj-$(CONFIG_PINCTRL_ST) += pinctrl-st.o
diff --git a/drivers/pinctrl/pinctrl-rp1.c b/drivers/pinctrl/pinctrl-rp1.c
new file mode 100644
index 000000000000..c035d2014505
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-rp1.c
@@ -0,0 +1,719 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for Raspberry Pi RP1 GPIO unit
+ *
+ * Copyright (C) 2023 Raspberry Pi Ltd.
+ *
+ * This driver is inspired by:
+ * pinctrl-bcm2835.c, please see original file for copyright information
+ */
+
+#include <linux/bitmap.h>
+#include <linux/bitops.h>
+#include <linux/bug.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio/driver.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/irqdesc.h>
+#include <linux/init.h>
+#include <linux/of_address.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/seq_file.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+
+#define MODULE_NAME "pinctrl-rp1"
+#define RP1_NUM_GPIOS 54
+#define RP1_NUM_BANKS 3
+
+#define RP1_RW_OFFSET 0x0000
+#define RP1_XOR_OFFSET (RP1_RW_OFFSET + 0x1000)
+#define RP1_SET_OFFSET (RP1_RW_OFFSET + 0x2000)
+#define RP1_CLR_OFFSET (RP1_RW_OFFSET + 0x3000)
+
+#define RP1_GPIO_REG_OFFSET 0x0000
+#define RP1_GPIO_STATUS (RP1_GPIO_REG_OFFSET + 0x0000)
+#define RP1_GPIO_CTRL (RP1_GPIO_REG_OFFSET + 0x0004)
+
+#define RP1_GPIO_EVENTS_SHIFT_RAW 20
+
+#define RP1_GPIO_CTRL_FUNCSEL_LSB 0
+#define RP1_GPIO_CTRL_FUNCSEL_MASK GENMASK(RP1_GPIO_CTRL_FUNCSEL_LSB + 4, \
+ RP1_GPIO_CTRL_FUNCSEL_LSB)
+#define RP1_GPIO_CTRL_OUTOVER_LSB 12
+#define RP1_GPIO_CTRL_OUTOVER_MASK GENMASK(RP1_GPIO_CTRL_OUTOVER_LSB + 1, \
+ RP1_GPIO_CTRL_OUTOVER_LSB)
+#define RP1_GPIO_CTRL_OEOVER_LSB 14
+#define RP1_GPIO_CTRL_OEOVER_MASK GENMASK(RP1_GPIO_CTRL_OEOVER_LSB + 1, \
+ RP1_GPIO_CTRL_OEOVER_LSB)
+#define RP1_GPIO_CTRL_INOVER_LSB 16
+#define RP1_GPIO_CTRL_INOVER_MASK GENMASK(RP1_GPIO_CTRL_INOVER_LSB + 1, \
+ RP1_GPIO_CTRL_INOVER_LSB)
+#define RP1_GPIO_CTRL_IRQEN_FALLING BIT(20)
+#define RP1_GPIO_CTRL_IRQEN_RISING BIT(21)
+#define RP1_GPIO_CTRL_IRQEN_LOW BIT(22)
+#define RP1_GPIO_CTRL_IRQEN_HIGH BIT(23)
+#define RP1_GPIO_CTRL_IRQEN_F_FALLING BIT(24)
+#define RP1_GPIO_CTRL_IRQEN_F_RISING BIT(25)
+#define RP1_GPIO_CTRL_IRQEN_F_LOW BIT(26)
+#define RP1_GPIO_CTRL_IRQEN_F_HIGH BIT(27)
+#define RP1_GPIO_CTRL_IRQRESET BIT(28)
+#define RP1_GPIO_CTRL_IRQOVER_LSB 30
+#define RP1_GPIO_CTRL_IRQOVER_MASK GENMASK(RP1_GPIO_CTRL_IRQOVER_LSB + 1, \
+ RP1_GPIO_CTRL_IRQOVER_LSB)
+
+#define RP1_INT_EDGE_FALLING BIT(0)
+#define RP1_INT_EDGE_RISING BIT(1)
+#define RP1_INT_LEVEL_LOW BIT(2)
+#define RP1_INT_LEVEL_HIGH BIT(3)
+#define RP1_INT_MASK GENMASK(3, 0)
+
+#define RP1_INT_EDGE_BOTH (RP1_INT_EDGE_FALLING | \
+ RP1_INT_EDGE_RISING)
+
+enum {
+ RP1_PUD_OFF = 0,
+ RP1_PUD_DOWN = 1,
+ RP1_PUD_UP = 2,
+};
+
+#define RP1_FSEL_COUNT 9
+
+#define RP1_FSEL_ALT0 0x00
+#define RP1_FSEL_GPIO 0x05
+#define RP1_FSEL_NONE 0x09
+#define RP1_FSEL_NONE_HW 0x1f
+
+enum {
+ RP1_DIR_OUTPUT = 0,
+ RP1_DIR_INPUT = 1,
+};
+
+enum {
+ RP1_OUTOVER_PERI = 0,
+ RP1_OUTOVER_INVPERI = 1,
+ RP1_OUTOVER_LOW = 2,
+ RP1_OUTOVER_HIGH = 3,
+};
+
+enum {
+ RP1_OEOVER_PERI = 0,
+ RP1_OEOVER_INVPERI = 1,
+ RP1_OEOVER_DISABLE = 2,
+ RP1_OEOVER_ENABLE = 3,
+};
+
+enum {
+ RP1_INOVER_PERI = 0,
+ RP1_INOVER_INVPERI = 1,
+ RP1_INOVER_LOW = 2,
+ RP1_INOVER_HIGH = 3,
+};
+
+#define RP1_RIO_OUT 0x00
+#define RP1_RIO_OE (RP1_RIO_OUT + 0x04)
+#define RP1_RIO_IN (RP1_RIO_OUT + 0x08)
+
+#define RP1_PAD_SLEWFAST_LSB 0
+#define RP1_PAD_SLEWFAST_MASK BIT(RP1_PAD_SLEWFAST_LSB)
+#define RP1_PAD_SCHMITT_LSB 1
+#define RP1_PAD_SCHMITT_MASK BIT(RP1_PAD_SCHMITT_LSB)
+#define RP1_PAD_PULL_LSB 2
+#define RP1_PAD_PULL_MASK GENMASK(RP1_PAD_PULL_LSB + 1, \
+ RP1_PAD_PULL_LSB)
+#define RP1_PAD_DRIVE_LSB 4
+#define RP1_PAD_DRIVE_MASK GENMASK(RP1_PAD_DRIVE_LSB + 1, \
+ RP1_PAD_DRIVE_LSB)
+#define RP1_PAD_IN_ENABLE_LSB 6
+#define RP1_PAD_IN_ENABLE_MASK BIT(RP1_PAD_IN_ENABLE_LSB)
+#define RP1_PAD_OUT_DISABLE_LSB 7
+#define RP1_PAD_OUT_DISABLE_MASK BIT(RP1_PAD_OUT_DISABLE_LSB)
+
+#define RP1_PAD_DRIVE_2MA 0x00000000
+#define RP1_PAD_DRIVE_4MA BIT(4)
+#define RP1_PAD_DRIVE_8MA BIT(5)
+#define RP1_PAD_DRIVE_12MA (RP1_PAD_DRIVE_4MA | \
+ RP1_PAD_DRIVE_8MA)
+
+#define FIELD_SET(_reg, _mask, _val) \
+ ({ \
+ _reg &= ~(_mask); \
+ _reg |= FIELD_PREP((_mask), (_val)); \
+ })
+
+#define FUNC(f) \
+ [func_##f] = #f
+
+struct rp1_iobank_desc {
+ int min_gpio;
+ int num_gpios;
+ int gpio_offset;
+ int inte_offset;
+ int ints_offset;
+ int rio_offset;
+ int pads_offset;
+};
+
+struct rp1_pin_info {
+ u8 num;
+ u8 bank;
+ u8 offset;
+ u8 fsel;
+ u8 irq_type;
+
+ void __iomem *gpio;
+ void __iomem *rio;
+ void __iomem *inte;
+ void __iomem *ints;
+ void __iomem *pad;
+};
+
+struct rp1_pinctrl {
+ struct device *dev;
+ void __iomem *gpio_base;
+ void __iomem *rio_base;
+ void __iomem *pads_base;
+ int irq[RP1_NUM_BANKS];
+ struct rp1_pin_info pins[RP1_NUM_GPIOS];
+
+ struct pinctrl_dev *pctl_dev;
+ struct gpio_chip gpio_chip;
+ struct pinctrl_gpio_range gpio_range;
+
+ raw_spinlock_t irq_lock[RP1_NUM_BANKS];
+};
+
+const struct rp1_iobank_desc rp1_iobanks[RP1_NUM_BANKS] = {
+ /* gpio inte ints rio pads */
+ { 0, 28, 0x0000, 0x011c, 0x0124, 0x0000, 0x0004 },
+ { 28, 6, 0x4000, 0x411c, 0x4124, 0x4000, 0x4004 },
+ { 34, 20, 0x8000, 0x811c, 0x8124, 0x8000, 0x8004 },
+};
+
+static int rp1_pinconf_set(struct rp1_pin_info *pin,
+ unsigned int offset, unsigned long *configs,
+ unsigned int num_configs);
+
+static struct rp1_pin_info *rp1_get_pin(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ struct rp1_pinctrl *pc = gpiochip_get_data(chip);
+
+ if (pc && offset < RP1_NUM_GPIOS)
+ return &pc->pins[offset];
+ return NULL;
+}
+
+static void rp1_pad_update(struct rp1_pin_info *pin, u32 clr, u32 set)
+{
+ u32 padctrl = readl(pin->pad);
+
+ padctrl &= ~clr;
+ padctrl |= set;
+
+ writel(padctrl, pin->pad);
+}
+
+static void rp1_input_enable(struct rp1_pin_info *pin, int value)
+{
+ rp1_pad_update(pin, RP1_PAD_IN_ENABLE_MASK,
+ value ? RP1_PAD_IN_ENABLE_MASK : 0);
+}
+
+static void rp1_output_enable(struct rp1_pin_info *pin, int value)
+{
+ rp1_pad_update(pin, RP1_PAD_OUT_DISABLE_MASK,
+ value ? 0 : RP1_PAD_OUT_DISABLE_MASK);
+}
+
+static u32 rp1_get_fsel(struct rp1_pin_info *pin)
+{
+ u32 ctrl = readl(pin->gpio + RP1_GPIO_CTRL);
+ u32 oeover = FIELD_GET(RP1_GPIO_CTRL_OEOVER_MASK, ctrl);
+ u32 fsel = FIELD_GET(RP1_GPIO_CTRL_FUNCSEL_MASK, ctrl);
+
+ if (oeover != RP1_OEOVER_PERI || fsel >= RP1_FSEL_COUNT)
+ fsel = RP1_FSEL_NONE;
+
+ return fsel;
+}
+
+static void rp1_set_fsel(struct rp1_pin_info *pin, u32 fsel)
+{
+ u32 ctrl = readl(pin->gpio + RP1_GPIO_CTRL);
+
+ if (fsel >= RP1_FSEL_COUNT)
+ fsel = RP1_FSEL_NONE_HW;
+
+ rp1_input_enable(pin, 1);
+ rp1_output_enable(pin, 1);
+
+ if (fsel == RP1_FSEL_NONE) {
+ FIELD_SET(ctrl, RP1_GPIO_CTRL_OEOVER_MASK, RP1_OEOVER_DISABLE);
+ } else {
+ FIELD_SET(ctrl, RP1_GPIO_CTRL_OUTOVER_MASK, RP1_OUTOVER_PERI);
+ FIELD_SET(ctrl, RP1_GPIO_CTRL_OEOVER_MASK, RP1_OEOVER_PERI);
+ }
+
+ FIELD_SET(ctrl, RP1_GPIO_CTRL_FUNCSEL_MASK, fsel);
+ writel(ctrl, pin->gpio + RP1_GPIO_CTRL);
+}
+
+static int rp1_get_dir(struct rp1_pin_info *pin)
+{
+ return !(readl(pin->rio + RP1_RIO_OE) & (1 << pin->offset)) ?
+ RP1_DIR_INPUT : RP1_DIR_OUTPUT;
+}
+
+static void rp1_set_dir(struct rp1_pin_info *pin, bool is_input)
+{
+ int offset = is_input ? RP1_CLR_OFFSET : RP1_SET_OFFSET;
+
+ writel(1 << pin->offset, pin->rio + RP1_RIO_OE + offset);
+}
+
+static int rp1_get_value(struct rp1_pin_info *pin)
+{
+ return !!(readl(pin->rio + RP1_RIO_IN) & (1 << pin->offset));
+}
+
+static void rp1_set_value(struct rp1_pin_info *pin, int value)
+{
+ /* Assume the pin is already an output */
+ writel(1 << pin->offset,
+ pin->rio + RP1_RIO_OUT + (value ? RP1_SET_OFFSET : RP1_CLR_OFFSET));
+}
+
+static int rp1_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+ struct rp1_pin_info *pin = rp1_get_pin(chip, offset);
+ int ret;
+
+ if (!pin)
+ return -EINVAL;
+
+ ret = rp1_get_value(pin);
+
+ return ret;
+}
+
+static void rp1_gpio_set(struct gpio_chip *chip, unsigned int offset, int value)
+{
+ struct rp1_pin_info *pin = rp1_get_pin(chip, offset);
+
+ if (pin)
+ rp1_set_value(pin, value);
+}
+
+static int rp1_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
+{
+ struct rp1_pin_info *pin = rp1_get_pin(chip, offset);
+ u32 fsel;
+
+ if (!pin)
+ return -EINVAL;
+
+ fsel = rp1_get_fsel(pin);
+ if (fsel != RP1_FSEL_GPIO)
+ return -EINVAL;
+
+ return (rp1_get_dir(pin) == RP1_DIR_OUTPUT) ?
+ GPIO_LINE_DIRECTION_OUT :
+ GPIO_LINE_DIRECTION_IN;
+}
+
+static int rp1_gpio_direction_input(struct gpio_chip *chip, unsigned int offset)
+{
+ struct rp1_pin_info *pin = rp1_get_pin(chip, offset);
+
+ if (!pin)
+ return -EINVAL;
+ rp1_set_dir(pin, RP1_DIR_INPUT);
+ rp1_set_fsel(pin, RP1_FSEL_GPIO);
+
+ return 0;
+}
+
+static int rp1_gpio_direction_output(struct gpio_chip *chip, unsigned int offset,
+ int value)
+{
+ struct rp1_pin_info *pin = rp1_get_pin(chip, offset);
+
+ if (!pin)
+ return -EINVAL;
+ rp1_set_value(pin, value);
+ rp1_set_dir(pin, RP1_DIR_OUTPUT);
+ rp1_set_fsel(pin, RP1_FSEL_GPIO);
+
+ return 0;
+}
+
+static int rp1_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
+ unsigned long config)
+{
+ struct rp1_pin_info *pin = rp1_get_pin(chip, offset);
+ unsigned long configs[] = { config };
+
+ return rp1_pinconf_set(pin, offset, configs,
+ ARRAY_SIZE(configs));
+}
+
+static const struct gpio_chip rp1_gpio_chip = {
+ .label = MODULE_NAME,
+ .owner = THIS_MODULE,
+ .request = gpiochip_generic_request,
+ .free = gpiochip_generic_free,
+ .direction_input = rp1_gpio_direction_input,
+ .direction_output = rp1_gpio_direction_output,
+ .get_direction = rp1_gpio_get_direction,
+ .get = rp1_gpio_get,
+ .set = rp1_gpio_set,
+ .base = -1,
+ .set_config = rp1_gpio_set_config,
+ .ngpio = RP1_NUM_GPIOS,
+ .can_sleep = false,
+};
+
+static void rp1_gpio_irq_handler(struct irq_desc *desc)
+{
+ struct gpio_chip *chip = irq_desc_get_handler_data(desc);
+ struct irq_chip *host_chip = irq_desc_get_chip(desc);
+ struct rp1_pinctrl *pc = gpiochip_get_data(chip);
+ const struct rp1_iobank_desc *bank;
+ int irq = irq_desc_get_irq(desc);
+ unsigned long ints;
+ int bit_pos;
+
+ if (pc->irq[0] == irq)
+ bank = &rp1_iobanks[0];
+ else if (pc->irq[1] == irq)
+ bank = &rp1_iobanks[1];
+ else
+ bank = &rp1_iobanks[2];
+
+ chained_irq_enter(host_chip, desc);
+
+ ints = readl(pc->gpio_base + bank->ints_offset);
+ for_each_set_bit(bit_pos, &ints, 32) {
+ struct rp1_pin_info *pin = rp1_get_pin(chip, bit_pos);
+
+ writel(RP1_GPIO_CTRL_IRQRESET,
+ pin->gpio + RP1_SET_OFFSET + RP1_GPIO_CTRL);
+ generic_handle_irq(irq_linear_revmap(pc->gpio_chip.irq.domain,
+ bank->gpio_offset + bit_pos));
+ }
+
+ chained_irq_exit(host_chip, desc);
+}
+
+static void rp1_gpio_irq_config(struct rp1_pin_info *pin, bool enable)
+{
+ writel(1 << pin->offset,
+ pin->inte + (enable ? RP1_SET_OFFSET : RP1_CLR_OFFSET));
+ if (!enable)
+ /* Clear any latched events */
+ writel(RP1_GPIO_CTRL_IRQRESET,
+ pin->gpio + RP1_SET_OFFSET + RP1_GPIO_CTRL);
+}
+
+static void rp1_gpio_irq_enable(struct irq_data *data)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ unsigned int gpio = irqd_to_hwirq(data);
+ struct rp1_pin_info *pin = rp1_get_pin(chip, gpio);
+
+ rp1_gpio_irq_config(pin, true);
+}
+
+static void rp1_gpio_irq_disable(struct irq_data *data)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ unsigned int gpio = irqd_to_hwirq(data);
+ struct rp1_pin_info *pin = rp1_get_pin(chip, gpio);
+
+ rp1_gpio_irq_config(pin, false);
+}
+
+static int rp1_irq_set_type(struct rp1_pin_info *pin, unsigned int type)
+{
+ u32 irq_flags;
+
+ switch (type) {
+ case IRQ_TYPE_NONE:
+ irq_flags = 0;
+ break;
+ case IRQ_TYPE_EDGE_RISING:
+ irq_flags = RP1_INT_EDGE_RISING;
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ irq_flags = RP1_INT_EDGE_FALLING;
+ break;
+ case IRQ_TYPE_EDGE_BOTH:
+ irq_flags = RP1_INT_EDGE_RISING | RP1_INT_EDGE_FALLING;
+ break;
+ case IRQ_TYPE_LEVEL_HIGH:
+ irq_flags = RP1_INT_LEVEL_HIGH;
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ irq_flags = RP1_INT_LEVEL_LOW;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ /* Clear them all */
+ writel(RP1_INT_MASK << RP1_GPIO_EVENTS_SHIFT_RAW,
+ pin->gpio + RP1_CLR_OFFSET + RP1_GPIO_CTRL);
+ /* Set those that are needed */
+ writel(irq_flags << RP1_GPIO_EVENTS_SHIFT_RAW,
+ pin->gpio + RP1_SET_OFFSET + RP1_GPIO_CTRL);
+ pin->irq_type = type;
+
+ return 0;
+}
+
+static int rp1_gpio_irq_set_type(struct irq_data *data, unsigned int type)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ unsigned int gpio = irqd_to_hwirq(data);
+ struct rp1_pin_info *pin = rp1_get_pin(chip, gpio);
+ struct rp1_pinctrl *pc = gpiochip_get_data(chip);
+ int bank = pin->bank;
+ unsigned long flags;
+ int ret;
+
+ raw_spin_lock_irqsave(&pc->irq_lock[bank], flags);
+
+ ret = rp1_irq_set_type(pin, type);
+ if (!ret) {
+ if (type & IRQ_TYPE_EDGE_BOTH)
+ irq_set_handler_locked(data, handle_edge_irq);
+ else
+ irq_set_handler_locked(data, handle_level_irq);
+ }
+
+ raw_spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
+
+ return ret;
+}
+
+static void rp1_gpio_irq_ack(struct irq_data *data)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ unsigned int gpio = irqd_to_hwirq(data);
+ struct rp1_pin_info *pin = rp1_get_pin(chip, gpio);
+
+ /* Clear any latched events */
+ writel(RP1_GPIO_CTRL_IRQRESET, pin->gpio + RP1_SET_OFFSET + RP1_GPIO_CTRL);
+}
+
+static struct irq_chip rp1_gpio_irq_chip = {
+ .name = MODULE_NAME,
+ .irq_enable = rp1_gpio_irq_enable,
+ .irq_disable = rp1_gpio_irq_disable,
+ .irq_set_type = rp1_gpio_irq_set_type,
+ .irq_ack = rp1_gpio_irq_ack,
+ .irq_mask = rp1_gpio_irq_disable,
+ .irq_unmask = rp1_gpio_irq_enable,
+ .flags = IRQCHIP_IMMUTABLE,
+};
+
+static void rp1_pull_config_set(struct rp1_pin_info *pin, unsigned int arg)
+{
+ u32 padctrl = readl(pin->pad);
+
+ FIELD_SET(padctrl, RP1_PAD_PULL_MASK, arg & 0x3);
+ writel(padctrl, pin->pad);
+}
+
+static int rp1_pinconf_set(struct rp1_pin_info *pin, unsigned int offset,
+ unsigned long *configs, unsigned int num_configs)
+{
+ u32 param, arg;
+ int i;
+
+ if (!pin)
+ return -EINVAL;
+
+ for (i = 0; i < num_configs; i++) {
+ param = pinconf_to_config_param(configs[i]);
+ arg = pinconf_to_config_argument(configs[i]);
+
+ switch (param) {
+ case PIN_CONFIG_BIAS_DISABLE:
+ rp1_pull_config_set(pin, RP1_PUD_OFF);
+ break;
+
+ case PIN_CONFIG_BIAS_PULL_DOWN:
+ rp1_pull_config_set(pin, RP1_PUD_DOWN);
+ break;
+
+ case PIN_CONFIG_BIAS_PULL_UP:
+ rp1_pull_config_set(pin, RP1_PUD_UP);
+ break;
+
+ case PIN_CONFIG_INPUT_ENABLE:
+ rp1_input_enable(pin, arg);
+ break;
+
+ case PIN_CONFIG_OUTPUT_ENABLE:
+ rp1_output_enable(pin, arg);
+ break;
+
+ case PIN_CONFIG_OUTPUT:
+ rp1_set_value(pin, arg);
+ rp1_set_dir(pin, RP1_DIR_OUTPUT);
+ rp1_set_fsel(pin, RP1_FSEL_GPIO);
+ break;
+
+ case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
+ rp1_pad_update(pin, RP1_PAD_SCHMITT_MASK,
+ arg ? RP1_PAD_SCHMITT_MASK : 0);
+ break;
+
+ case PIN_CONFIG_SLEW_RATE:
+ rp1_pad_update(pin, RP1_PAD_SLEWFAST_MASK,
+ arg ? RP1_PAD_SLEWFAST_MASK : 0);
+ break;
+
+ case PIN_CONFIG_DRIVE_STRENGTH:
+ switch (arg) {
+ case 2:
+ arg = RP1_PAD_DRIVE_2MA;
+ break;
+ case 4:
+ arg = RP1_PAD_DRIVE_4MA;
+ break;
+ case 8:
+ arg = RP1_PAD_DRIVE_8MA;
+ break;
+ case 12:
+ arg = RP1_PAD_DRIVE_12MA;
+ break;
+ default:
+ return -ENOTSUPP;
+ }
+ rp1_pad_update(pin, RP1_PAD_DRIVE_MASK, arg);
+ break;
+
+ default:
+ return -ENOTSUPP;
+
+ } /* switch param type */
+ } /* for each config */
+
+ return 0;
+}
+
+static const struct of_device_id rp1_pinctrl_match[] = {
+ { .compatible = "raspberrypi,rp1-gpio" },
+ {},
+};
+
+static int rp1_pinctrl_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct gpio_irq_chip *girq;
+ struct rp1_pinctrl *pc;
+ int err, i;
+
+ pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL);
+ if (!pc)
+ return -ENOMEM;
+
+ pc->dev = dev;
+ pc->gpio_chip = rp1_gpio_chip;
+ pc->gpio_chip.parent = dev;
+
+ pc->gpio_base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(pc->gpio_base)) {
+ dev_err(dev, "could not get GPIO IO memory\n");
+ return PTR_ERR(pc->gpio_base);
+ }
+
+ pc->rio_base = devm_platform_ioremap_resource(pdev, 1);
+ if (IS_ERR(pc->rio_base)) {
+ dev_err(dev, "could not get RIO IO memory\n");
+ return PTR_ERR(pc->rio_base);
+ }
+
+ pc->pads_base = devm_platform_ioremap_resource(pdev, 2);
+ if (IS_ERR(pc->pads_base)) {
+ dev_err(dev, "could not get PADS IO memory\n");
+ return PTR_ERR(pc->pads_base);
+ }
+
+ for (i = 0; i < RP1_NUM_BANKS; i++) {
+ const struct rp1_iobank_desc *bank = &rp1_iobanks[i];
+ int j;
+
+ for (j = 0; j < bank->num_gpios; j++) {
+ struct rp1_pin_info *pin =
+ &pc->pins[bank->min_gpio + j];
+
+ pin->num = bank->min_gpio + j;
+ pin->bank = i;
+ pin->offset = j;
+
+ pin->gpio = pc->gpio_base + bank->gpio_offset +
+ j * sizeof(u32) * 2;
+ pin->inte = pc->gpio_base + bank->inte_offset;
+ pin->ints = pc->gpio_base + bank->ints_offset;
+ pin->rio = pc->rio_base + bank->rio_offset;
+ pin->pad = pc->pads_base + bank->pads_offset +
+ j * sizeof(u32);
+ }
+
+ raw_spin_lock_init(&pc->irq_lock[i]);
+ }
+
+ girq = &pc->gpio_chip.irq;
+ girq->chip = &rp1_gpio_irq_chip;
+ girq->parent_handler = rp1_gpio_irq_handler;
+ girq->num_parents = RP1_NUM_BANKS;
+ girq->parents = pc->irq;
+ girq->default_type = IRQ_TYPE_NONE;
+ girq->handler = handle_level_irq;
+
+ /*
+ * Use the same handler for all groups: this is necessary
+ * since we use one gpiochip to cover all lines - the
+ * irq handler then needs to figure out which group and
+ * bank that was firing the IRQ and look up the per-group
+ * and bank data.
+ */
+ for (i = 0; i < RP1_NUM_BANKS; i++) {
+ pc->irq[i] = irq_of_parse_and_map(np, i);
+ if (!pc->irq[i]) {
+ girq->num_parents = i;
+ break;
+ }
+ }
+
+ platform_set_drvdata(pdev, pc);
+
+ err = devm_gpiochip_add_data(dev, &pc->gpio_chip, pc);
+ if (err) {
+ dev_err(dev, "could not add GPIO chip\n");
+ return err;
+ }
+
+ return 0;
+}
+
+static struct platform_driver rp1_pinctrl_driver = {
+ .probe = rp1_pinctrl_probe,
+ .driver = {
+ .name = MODULE_NAME,
+ .of_match_table = rp1_pinctrl_match,
+ .suppress_bind_attrs = true,
+ },
+};
+builtin_platform_driver(rp1_pinctrl_driver);
--
2.35.3