[PATCH v4 12/16] pinctrl: starfive: Add pinctrl driver for StarFive SoCs

Emil Renner Berthing
2021-11-16T15:05:59Z

Add a combined pinctrl and GPIO driver for the JH7100 RISC-V SoC by
StarFive Ltd. This is a test chip for their upcoming JH7110 SoC, which
is said to feature only minor changes to these pinctrl/GPIO parts.

For each "GPIO" there are two registers for configuring the output and
output enable signals which may come from other peripherals. Among these
are two special signals that are constant 0 and constant 1 respectively.
Controlling the GPIOs from software is done by choosing one of these
signals. In other words the same registers are used for both pin muxing
and controlling the GPIOs, which makes it easier to combine the pinctrl
and GPIO driver in one.

I wrote the pinconf and pinmux parts, but the GPIO part of the code is
based on the GPIO driver in the vendor tree written by Huan Feng with
cleanups and fixes by Drew and me.

Datasheet: https://github.com/starfive-tech/JH7100_Docs/blob/main/JH7100%20Data%20Sheet%20V01.01.04-EN%20(4-21-2021).pdf
Co-developed-by: Huan Feng <huan.feng@starfivetech.com>
Signed-off-by: Huan Feng <huan.feng@starfivetech.com>
Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
Co-developed-by: Drew Fustini <drew@beagleboard.org>
Signed-off-by: Drew Fustini <drew@beagleboard.org>
---
MAINTAINERS | 8 +
drivers/pinctrl/Kconfig | 17 +
drivers/pinctrl/Makefile | 1 +
drivers/pinctrl/pinctrl-starfive.c | 1354 ++++++++++++++++++++++++++++
4 files changed, 1380 insertions(+)
create mode 100644 drivers/pinctrl/pinctrl-starfive.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 1152f5d94690..30d6842969e7 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -18137,6 +18137,14 @@ F: Documentation/devicetree/bindings/clock/starfive,jh7100-clkgen.yaml
F: drivers/clk/starfive/clk-starfive-jh7100.c
F: include/dt-bindings/clock/starfive-jh7100.h

+STARFIVE JH7100 PINCTRL DRIVER
+M: Emil Renner Berthing <kernel@esmil.dk>
+L: linux-gpio@vger.kernel.org
+S: Maintained
+F: Documentation/devicetree/bindings/pinctrl/starfive,jh7100-pinctrl.yaml
+F: drivers/pinctrl/pinctrl-starfive.c
+F: include/dt-bindings/pinctrl/pinctrl-starfive.h
+
STARFIVE JH7100 RESET CONTROLLER DRIVER
M: Emil Renner Berthing <kernel@esmil.dk>
S: Maintained
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index 6a961d5f8726..0d5b61e4c21e 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -281,6 +281,23 @@ config PINCTRL_ST
select PINCONF
select GPIOLIB_IRQCHIP

+config PINCTRL_STARFIVE
+ tristate "Pinctrl and GPIO driver for the StarFive JH7100 SoC"
+ depends on SOC_STARFIVE || COMPILE_TEST
+ depends on OF
+ default SOC_STARFIVE
+ select GENERIC_PINCTRL_GROUPS
+ select GENERIC_PINMUX_FUNCTIONS
+ select GENERIC_PINCONF
+ select GPIOLIB
+ select GPIOLIB_IRQCHIP
+ select OF_GPIO
+ help
+ Say yes here to support pin control on the StarFive JH7100 SoC.
+ This also provides an interface to the GPIO pins not used by other
+ peripherals supporting inputs, outputs, configuring pull-up/pull-down
+ and interrupts on input changes.
+
config PINCTRL_STMFX
tristate "STMicroelectronics STMFX GPIO expander pinctrl driver"
depends on I2C
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index 5e63de2ffcf4..f5bdd6b209a6 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -39,6 +39,7 @@ obj-$(CONFIG_PINCTRL_LANTIQ) += pinctrl-lantiq.o
obj-$(CONFIG_PINCTRL_LPC18XX) += pinctrl-lpc18xx.o
obj-$(CONFIG_PINCTRL_TB10X) += pinctrl-tb10x.o
obj-$(CONFIG_PINCTRL_ST) += pinctrl-st.o
+obj-$(CONFIG_PINCTRL_STARFIVE) += pinctrl-starfive.o
obj-$(CONFIG_PINCTRL_STMFX) += pinctrl-stmfx.o
obj-$(CONFIG_PINCTRL_ZYNQ) += pinctrl-zynq.o
obj-$(CONFIG_PINCTRL_ZYNQMP) += pinctrl-zynqmp.o
diff --git a/drivers/pinctrl/pinctrl-starfive.c b/drivers/pinctrl/pinctrl-starfive.c
new file mode 100644
index 000000000000..0b912152a405
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-starfive.c
@@ -0,0 +1,1354 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Pinctrl / GPIO driver for StarFive JH7100 SoC
+ *
+ * Copyright (C) 2020 Shanghai StarFive Technology Co., Ltd.
+ * Copyright (C) 2021 Emil Renner Berthing <kernel@esmil.dk>
+ */
+
+#include <linux/bits.h>
+#include <linux/clk.h>
+#include <linux/gpio/driver.h>
+#include <linux/io.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+#include <linux/spinlock.h>
+
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+
+#include <dt-bindings/pinctrl/pinctrl-starfive.h>
+
+#include "core.h"
+#include "pinctrl-utils.h"
+#include "pinmux.h"
+#include "pinconf.h"
+
+#define DRIVER_NAME "pinctrl-starfive"
+
+/*
+ * Refer to Section 12. GPIO Registers in the JH7100 data sheet:
+ * https://github.com/starfive-tech/JH7100_Docs
+ */
+#define NR_GPIOS 64
+
+/*
+ * Global enable for GPIO interrupts. If bit 0 is set to 1 the GPIO interrupts
+ * are enabled. If set to 0 the GPIO interrupts are disabled.
+ */
+#define GPIOEN 0x000
+
+/*
+ * The following 32-bit registers come in pairs, but only the offset of the
+ * first register is defined. The first controls (interrupts for) GPIO 0-31 and
+ * the second GPIO 32-63.
+ */
+
+/*
+ * Interrupt Type. If set to 1 the interrupt is edge-triggered. If set to 0 the
+ * interrupt is level-triggered.
+ */
+#define GPIOIS 0x010
+
+/*
+ * Edge-Trigger Interrupt Type. If set to 1 the interrupt gets triggered on
+ * both positive and negative edges. If set to 0 the interrupt is triggered by a
+ * single edge.
+ */
+#define GPIOIBE 0x018
+
+/*
+ * Interrupt Trigger Polarity. If set to 1 the interrupt is triggered on a
+ * rising edge (edge-triggered) or high level (level-triggered). If set to 0 the
+ * interrupt is triggered on a falling edge (edge-triggered) or low level
+ * (level-triggered).
+ */
+#define GPIOIEV 0x020
+
+/*
+ * Interrupt Mask. If set to 1 the interrupt is enabled (unmasked). If set to 0
+ * the interrupt is disabled (masked). Note that the current documentation is
+ * wrong and says the exct opposite of this.
+ */
+#define GPIOIE 0x028
+
+/*
+ * Clear Edge-Triggered Interrupts. Write a 1 to clear the edge-triggered
+ * interrupt.
+ */
+#define GPIOIC 0x030
+
+/*
+ * Edge-Triggered Interrupt Status. A 1 means the configured edge was detected.
+ */
+#define GPIORIS 0x038
+
+/*
+ * Interrupt Status after Masking. A 1 means the configured edge or level was
+ * detected and not masked.
+ */
+#define GPIOMIS 0x040
+
+/*
+ * Data Value. Dynamically reflects the value of the GPIO pin. If 1 the pin is
+ * a digital 1 and if 0 the pin is a digital 0.
+ */
+#define GPIODIN 0x048
+
+/*
+ * From the data sheet section 12.2, there are 64 32-bit output data registers
+ * and 64 output enable registers. Output data and output enable registers for
+ * a given GPIO are contiguous. Eg. GPO0_DOUT_CFG is 0x50 and GPO0_DOEN_CFG is
+ * 0x54 while GPO1_DOUT_CFG is 0x58 and GPO1_DOEN_CFG is 0x5c. The stride
+ * between GPIO registers is effectively 8, thus: GPOn_DOUT_CFG is 0x50 + 8n
+ * and GPOn_DOEN_CFG is 0x54 + 8n.
+ */
+#define GPON_DOUT_CFG 0x050
+#define GPON_DOEN_CFG 0x054
+
+/*
+ * From Section 12.3, there are 75 input signal configuration registers which
+ * are 4 bytes wide starting with GPI_CPU_JTAG_TCK_CFG at 0x250 and ending with
+ * GPI_USB_OVER_CURRENT_CFG 0x378
+ */
+#define GPI_CFG_OFFSET 0x250
+
+/*
+ * Pad Control Bits. There are 16 pad control bits for each pin located in 103
+ * 32-bit registers controlling PAD_GPIO[0] to PAD_GPIO[63] followed by
+ * PAD_FUNC_SHARE[0] to PAD_FUNC_SHARE[141]. Odd numbered pins use the upper 16
+ * bit of each register.
+ */
+#define PAD_SLEW_RATE_MASK GENMASK(11, 9)
+#define PAD_SLEW_RATE_POS 9
+#define PAD_BIAS_STRONG_PULL_UP BIT(8)
+#define PAD_INPUT_ENABLE BIT(7)
+#define PAD_INPUT_SCHMITT_ENABLE BIT(6)
+#define PAD_BIAS_DISABLE BIT(5)
+#define PAD_BIAS_PULL_DOWN BIT(4)
+#define PAD_BIAS_MASK \
+ (PAD_BIAS_STRONG_PULL_UP | \
+ PAD_BIAS_DISABLE | \
+ PAD_BIAS_PULL_DOWN)
+#define PAD_DRIVE_STRENGTH_MASK GENMASK(3, 0)
+#define PAD_DRIVE_STRENGTH_POS 0
+
+/*
+ * From Section 11, the IO_PADSHARE_SEL register can be programmed to select
+ * one of seven pre-defined multiplexed signal groups on PAD_FUNC_SHARE and
+ * PAD_GPIO pads. This is a global setting.
+ */
+#define IO_PADSHARE_SEL 0x1a0
+
+/*
+ * This just needs to be some number such that when
+ * sfp->gpio.pin_base = PAD_INVALID_GPIO then
+ * starfive_pin_to_gpio(sfp, validpin) is never a valid GPIO number.
+ * That is it should underflow and return something >= NR_GPIOS.
+ */
+#define PAD_INVALID_GPIO 0x10000
+
+/*
+ * The packed pinmux values from the device tree look like this:
+ *
+ * | 31 - 24 | 23 - 16 | 15 - 8 | 7 | 6 | 5 - 0 |
+ * | dout | doen | din | dout rev | doen rev | gpio nr |
+ *
+ * ..but the GPOn_DOUT_CFG and GPOn_DOEN_CFG registers look like this:
+ *
+ * | 31 | 30 - 8 | 7 - 0 |
+ * | dout/doen rev | unused | dout/doen |
+ */
+static unsigned int starfive_pinmux_to_gpio(u32 v)
+{
+ return v & (NR_GPIOS - 1);
+}
+
+static u32 starfive_pinmux_to_dout(u32 v)
+{
+ return ((v & BIT(7)) << (31 - 7)) | ((v >> 24) & GENMASK(7, 0));
+}
+
+static u32 starfive_pinmux_to_doen(u32 v)
+{
+ return ((v & BIT(6)) << (31 - 6)) | ((v >> 16) & GENMASK(7, 0));
+}
+
+static u32 starfive_pinmux_to_din(u32 v)
+{
+ return (v >> 8) & GENMASK(7, 0);
+}
+
+/*
+ * The maximum GPIO output current depends on the chosen drive strength:
+ *
+ * DS: 0 1 2 3 4 5 6 7
+ * mA: 14.2 21.2 28.2 35.2 42.2 49.1 56.0 62.8
+ *
+ * After rounding that is 7*DS + 14 mA
+ */
+static u32 starfive_drive_strength_to_max_mA(u16 ds)
+{
+ return 7 * ds + 14;
+}
+
+static u16 starfive_drive_strength_from_max_mA(u32 i)
+{
+ return (clamp(i, 14U, 63U) - 14) / 7;
+}
+
+struct starfive_pinctrl {
+ struct gpio_chip gc;
+ struct pinctrl_gpio_range gpios;
+ raw_spinlock_t lock;
+ void __iomem *base;
+ void __iomem *padctl;
+ struct pinctrl_dev *pctl;
+};
+
+static inline unsigned int starfive_pin_to_gpio(const struct starfive_pinctrl *sfp,
+ unsigned int pin)
+{
+ return pin - sfp->gpios.pin_base;
+}
+
+static inline unsigned int starfive_gpio_to_pin(const struct starfive_pinctrl *sfp,
+ unsigned int gpio)
+{
+ return sfp->gpios.pin_base + gpio;
+}
+
+static struct starfive_pinctrl *starfive_from_irq_data(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+
+ return container_of(gc, struct starfive_pinctrl, gc);
+}
+
+static struct starfive_pinctrl *starfive_from_irq_desc(struct irq_desc *desc)
+{
+ struct gpio_chip *gc = irq_desc_get_handler_data(desc);
+
+ return container_of(gc, struct starfive_pinctrl, gc);
+}
+
+static const struct pinctrl_pin_desc starfive_pins[] = {
+ PINCTRL_PIN(PAD_GPIO(0), "GPIO[0]"),
+ PINCTRL_PIN(PAD_GPIO(1), "GPIO[1]"),
+ PINCTRL_PIN(PAD_GPIO(2), "GPIO[2]"),
+ PINCTRL_PIN(PAD_GPIO(3), "GPIO[3]"),
+ PINCTRL_PIN(PAD_GPIO(4), "GPIO[4]"),
+ PINCTRL_PIN(PAD_GPIO(5), "GPIO[5]"),
+ PINCTRL_PIN(PAD_GPIO(6), "GPIO[6]"),
+ PINCTRL_PIN(PAD_GPIO(7), "GPIO[7]"),
+ PINCTRL_PIN(PAD_GPIO(8), "GPIO[8]"),
+ PINCTRL_PIN(PAD_GPIO(9), "GPIO[9]"),
+ PINCTRL_PIN(PAD_GPIO(10), "GPIO[10]"),
+ PINCTRL_PIN(PAD_GPIO(11), "GPIO[11]"),
+ PINCTRL_PIN(PAD_GPIO(12), "GPIO[12]"),
+ PINCTRL_PIN(PAD_GPIO(13), "GPIO[13]"),
+ PINCTRL_PIN(PAD_GPIO(14), "GPIO[14]"),
+ PINCTRL_PIN(PAD_GPIO(15), "GPIO[15]"),
+ PINCTRL_PIN(PAD_GPIO(16), "GPIO[16]"),
+ PINCTRL_PIN(PAD_GPIO(17), "GPIO[17]"),
+ PINCTRL_PIN(PAD_GPIO(18), "GPIO[18]"),
+ PINCTRL_PIN(PAD_GPIO(19), "GPIO[19]"),
+ PINCTRL_PIN(PAD_GPIO(20), "GPIO[20]"),
+ PINCTRL_PIN(PAD_GPIO(21), "GPIO[21]"),
+ PINCTRL_PIN(PAD_GPIO(22), "GPIO[22]"),
+ PINCTRL_PIN(PAD_GPIO(23), "GPIO[23]"),
+ PINCTRL_PIN(PAD_GPIO(24), "GPIO[24]"),
+ PINCTRL_PIN(PAD_GPIO(25), "GPIO[25]"),
+ PINCTRL_PIN(PAD_GPIO(26), "GPIO[26]"),
+ PINCTRL_PIN(PAD_GPIO(27), "GPIO[27]"),
+ PINCTRL_PIN(PAD_GPIO(28), "GPIO[28]"),
+ PINCTRL_PIN(PAD_GPIO(29), "GPIO[29]"),
+ PINCTRL_PIN(PAD_GPIO(30), "GPIO[30]"),
+ PINCTRL_PIN(PAD_GPIO(31), "GPIO[31]"),
+ PINCTRL_PIN(PAD_GPIO(32), "GPIO[32]"),
+ PINCTRL_PIN(PAD_GPIO(33), "GPIO[33]"),
+ PINCTRL_PIN(PAD_GPIO(34), "GPIO[34]"),
+ PINCTRL_PIN(PAD_GPIO(35), "GPIO[35]"),
+ PINCTRL_PIN(PAD_GPIO(36), "GPIO[36]"),
+ PINCTRL_PIN(PAD_GPIO(37), "GPIO[37]"),
+ PINCTRL_PIN(PAD_GPIO(38), "GPIO[38]"),
+ PINCTRL_PIN(PAD_GPIO(39), "GPIO[39]"),
+ PINCTRL_PIN(PAD_GPIO(40), "GPIO[40]"),
+ PINCTRL_PIN(PAD_GPIO(41), "GPIO[41]"),
+ PINCTRL_PIN(PAD_GPIO(42), "GPIO[42]"),
+ PINCTRL_PIN(PAD_GPIO(43), "GPIO[43]"),
+ PINCTRL_PIN(PAD_GPIO(44), "GPIO[44]"),
+ PINCTRL_PIN(PAD_GPIO(45), "GPIO[45]"),
+ PINCTRL_PIN(PAD_GPIO(46), "GPIO[46]"),
+ PINCTRL_PIN(PAD_GPIO(47), "GPIO[47]"),
+ PINCTRL_PIN(PAD_GPIO(48), "GPIO[48]"),
+ PINCTRL_PIN(PAD_GPIO(49), "GPIO[49]"),
+ PINCTRL_PIN(PAD_GPIO(50), "GPIO[50]"),
+ PINCTRL_PIN(PAD_GPIO(51), "GPIO[51]"),
+ PINCTRL_PIN(PAD_GPIO(52), "GPIO[52]"),
+ PINCTRL_PIN(PAD_GPIO(53), "GPIO[53]"),
+ PINCTRL_PIN(PAD_GPIO(54), "GPIO[54]"),
+ PINCTRL_PIN(PAD_GPIO(55), "GPIO[55]"),
+ PINCTRL_PIN(PAD_GPIO(56), "GPIO[56]"),
+ PINCTRL_PIN(PAD_GPIO(57), "GPIO[57]"),
+ PINCTRL_PIN(PAD_GPIO(58), "GPIO[58]"),
+ PINCTRL_PIN(PAD_GPIO(59), "GPIO[59]"),
+ PINCTRL_PIN(PAD_GPIO(60), "GPIO[60]"),
+ PINCTRL_PIN(PAD_GPIO(61), "GPIO[61]"),
+ PINCTRL_PIN(PAD_GPIO(62), "GPIO[62]"),
+ PINCTRL_PIN(PAD_GPIO(63), "GPIO[63]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(0), "FUNC_SHARE[0]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(1), "FUNC_SHARE[1]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(2), "FUNC_SHARE[2]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(3), "FUNC_SHARE[3]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(4), "FUNC_SHARE[4]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(5), "FUNC_SHARE[5]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(6), "FUNC_SHARE[6]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(7), "FUNC_SHARE[7]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(8), "FUNC_SHARE[8]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(9), "FUNC_SHARE[9]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(10), "FUNC_SHARE[10]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(11), "FUNC_SHARE[11]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(12), "FUNC_SHARE[12]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(13), "FUNC_SHARE[13]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(14), "FUNC_SHARE[14]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(15), "FUNC_SHARE[15]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(16), "FUNC_SHARE[16]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(17), "FUNC_SHARE[17]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(18), "FUNC_SHARE[18]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(19), "FUNC_SHARE[19]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(20), "FUNC_SHARE[20]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(21), "FUNC_SHARE[21]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(22), "FUNC_SHARE[22]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(23), "FUNC_SHARE[23]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(24), "FUNC_SHARE[24]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(25), "FUNC_SHARE[25]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(26), "FUNC_SHARE[26]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(27), "FUNC_SHARE[27]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(28), "FUNC_SHARE[28]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(29), "FUNC_SHARE[29]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(30), "FUNC_SHARE[30]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(31), "FUNC_SHARE[31]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(32), "FUNC_SHARE[32]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(33), "FUNC_SHARE[33]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(34), "FUNC_SHARE[34]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(35), "FUNC_SHARE[35]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(36), "FUNC_SHARE[36]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(37), "FUNC_SHARE[37]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(38), "FUNC_SHARE[38]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(39), "FUNC_SHARE[39]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(40), "FUNC_SHARE[40]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(41), "FUNC_SHARE[41]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(42), "FUNC_SHARE[42]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(43), "FUNC_SHARE[43]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(44), "FUNC_SHARE[44]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(45), "FUNC_SHARE[45]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(46), "FUNC_SHARE[46]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(47), "FUNC_SHARE[47]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(48), "FUNC_SHARE[48]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(49), "FUNC_SHARE[49]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(50), "FUNC_SHARE[50]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(51), "FUNC_SHARE[51]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(52), "FUNC_SHARE[52]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(53), "FUNC_SHARE[53]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(54), "FUNC_SHARE[54]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(55), "FUNC_SHARE[55]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(56), "FUNC_SHARE[56]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(57), "FUNC_SHARE[57]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(58), "FUNC_SHARE[58]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(59), "FUNC_SHARE[59]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(60), "FUNC_SHARE[60]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(61), "FUNC_SHARE[61]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(62), "FUNC_SHARE[62]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(63), "FUNC_SHARE[63]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(64), "FUNC_SHARE[64]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(65), "FUNC_SHARE[65]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(66), "FUNC_SHARE[66]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(67), "FUNC_SHARE[67]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(68), "FUNC_SHARE[68]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(69), "FUNC_SHARE[69]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(70), "FUNC_SHARE[70]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(71), "FUNC_SHARE[71]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(72), "FUNC_SHARE[72]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(73), "FUNC_SHARE[73]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(74), "FUNC_SHARE[74]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(75), "FUNC_SHARE[75]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(76), "FUNC_SHARE[76]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(77), "FUNC_SHARE[77]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(78), "FUNC_SHARE[78]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(79), "FUNC_SHARE[79]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(80), "FUNC_SHARE[80]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(81), "FUNC_SHARE[81]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(82), "FUNC_SHARE[82]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(83), "FUNC_SHARE[83]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(84), "FUNC_SHARE[84]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(85), "FUNC_SHARE[85]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(86), "FUNC_SHARE[86]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(87), "FUNC_SHARE[87]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(88), "FUNC_SHARE[88]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(89), "FUNC_SHARE[89]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(90), "FUNC_SHARE[90]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(91), "FUNC_SHARE[91]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(92), "FUNC_SHARE[92]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(93), "FUNC_SHARE[93]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(94), "FUNC_SHARE[94]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(95), "FUNC_SHARE[95]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(96), "FUNC_SHARE[96]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(97), "FUNC_SHARE[97]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(98), "FUNC_SHARE[98]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(99), "FUNC_SHARE[99]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(100), "FUNC_SHARE[100]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(101), "FUNC_SHARE[101]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(102), "FUNC_SHARE[102]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(103), "FUNC_SHARE[103]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(104), "FUNC_SHARE[104]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(105), "FUNC_SHARE[105]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(106), "FUNC_SHARE[106]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(107), "FUNC_SHARE[107]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(108), "FUNC_SHARE[108]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(109), "FUNC_SHARE[109]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(110), "FUNC_SHARE[110]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(111), "FUNC_SHARE[111]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(112), "FUNC_SHARE[112]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(113), "FUNC_SHARE[113]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(114), "FUNC_SHARE[114]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(115), "FUNC_SHARE[115]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(116), "FUNC_SHARE[116]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(117), "FUNC_SHARE[117]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(118), "FUNC_SHARE[118]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(119), "FUNC_SHARE[119]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(120), "FUNC_SHARE[120]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(121), "FUNC_SHARE[121]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(122), "FUNC_SHARE[122]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(123), "FUNC_SHARE[123]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(124), "FUNC_SHARE[124]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(125), "FUNC_SHARE[125]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(126), "FUNC_SHARE[126]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(127), "FUNC_SHARE[127]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(128), "FUNC_SHARE[128]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(129), "FUNC_SHARE[129]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(130), "FUNC_SHARE[130]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(131), "FUNC_SHARE[131]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(132), "FUNC_SHARE[132]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(133), "FUNC_SHARE[133]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(134), "FUNC_SHARE[134]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(135), "FUNC_SHARE[135]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(136), "FUNC_SHARE[136]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(137), "FUNC_SHARE[137]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(138), "FUNC_SHARE[138]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(139), "FUNC_SHARE[139]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(140), "FUNC_SHARE[140]"),
+ PINCTRL_PIN(PAD_FUNC_SHARE(141), "FUNC_SHARE[141]"),
+};
+
+#ifdef CONFIG_DEBUG_FS
+static void starfive_pin_dbg_show(struct pinctrl_dev *pctldev,
+ struct seq_file *s,
+ unsigned int pin)
+{
+ struct starfive_pinctrl *sfp = pinctrl_dev_get_drvdata(pctldev);
+ unsigned int gpio = starfive_pin_to_gpio(sfp, pin);
+ void __iomem *reg;
+ u32 dout, doen;
+
+ if (gpio >= NR_GPIOS)
+ return;
+
+ reg = sfp->base + GPON_DOUT_CFG + 8 * gpio;
+ dout = readl_relaxed(reg + 0x000);
+ doen = readl_relaxed(reg + 0x004);
+
+ seq_printf(s, "dout=%lu%s doen=%lu%s",
+ dout & GENMASK(7, 0), (dout & BIT(31)) ? "r" : "",
+ doen & GENMASK(7, 0), (doen & BIT(31)) ? "r" : "");
+}
+#else
+#define starfive_pin_dbg_show NULL
+#endif
+
+static int starfive_dt_node_to_map(struct pinctrl_dev *pctldev,
+ struct device_node *np,
+ struct pinctrl_map **maps,
+ unsigned int *num_maps)
+{
+ struct starfive_pinctrl *sfp = pinctrl_dev_get_drvdata(pctldev);
+ struct device *dev = sfp->gc.parent;
+ struct device_node *child;
+ struct pinctrl_map *map;
+ const char **pgnames;
+ const char *grpname;
+ u32 *pinmux;
+ int ngroups;
+ int *pins;
+ int nmaps;
+ int ret;
+
+ nmaps = 0;
+ ngroups = 0;
+ for_each_child_of_node(np, child) {
+ int npinmux = of_property_count_u32_elems(child, "pinmux");
+ int npins = of_property_count_u32_elems(child, "pins");
+
+ if (npinmux > 0 && npins > 0) {
+ dev_err(dev, "invalid pinctrl group %pOFn.%pOFn: both pinmux and pins set\n",
+ np, child);
+ of_node_put(child);
+ return -EINVAL;
+ }
+ if (npinmux == 0 && npins == 0) {
+ dev_err(dev, "invalid pinctrl group %pOFn.%pOFn: neither pinmux nor pins set\n",
+ np, child);
+ of_node_put(child);
+ return -EINVAL;
+ }
+
+ if (npinmux > 0)
+ nmaps += 2;
+ else
+ nmaps += 1;
+ ngroups += 1;
+ }
+
+ pgnames = devm_kcalloc(dev, ngroups, sizeof(*pgnames), GFP_KERNEL);
+ if (!pgnames)
+ return -ENOMEM;
+
+ map = kcalloc(nmaps, sizeof(*map), GFP_KERNEL);
+ if (!map)
+ return -ENOMEM;
+
+ nmaps = 0;
+ ngroups = 0;
+ for_each_child_of_node(np, child) {
+ int npins;
+ int i;
+
+ grpname = devm_kasprintf(dev, GFP_KERNEL, "%pOFn.%pOFn", np, child);
+ if (!grpname) {
+ ret = -ENOMEM;
+ goto put_child;
+ }
+
+ pgnames[ngroups++] = grpname;
+
+ if ((npins = of_property_count_u32_elems(child, "pinmux")) > 0) {
+ pins = devm_kcalloc(dev, npins, sizeof(*pins), GFP_KERNEL);
+ if (!pins) {
+ ret = -ENOMEM;
+ goto put_child;
+ }
+
+ pinmux = devm_kcalloc(dev, npins, sizeof(*pinmux), GFP_KERNEL);
+ if (!pinmux) {
+ ret = -ENOMEM;
+ goto put_child;
+ }
+
+ ret = of_property_read_u32_array(child, "pinmux", pinmux, npins);
+ if (ret)
+ goto put_child;
+
+ for (i = 0; i < npins; i++) {
+ unsigned int gpio = starfive_pinmux_to_gpio(pinmux[i]);
+
+ pins[i] = starfive_gpio_to_pin(sfp, gpio);
+ }
+
+ map[nmaps].type = PIN_MAP_TYPE_MUX_GROUP;
+ map[nmaps].data.mux.function = np->name;
+ map[nmaps].data.mux.group = grpname;
+ nmaps += 1;
+ } else if ((npins = of_property_count_u32_elems(child, "pins")) > 0) {
+ pins = devm_kcalloc(dev, npins, sizeof(*pins), GFP_KERNEL);
+ if (!pins) {
+ ret = -ENOMEM;
+ goto put_child;
+ }
+
+ pinmux = NULL;
+
+ for (i = 0; i < npins; i++) {
+ u32 v;
+
+ ret = of_property_read_u32_index(child, "pins", i, &v);
+ if (ret)
+ goto put_child;
+ pins[i] = v;
+ }
+ } else {
+ ret = -EINVAL;
+ goto put_child;
+ }
+
+ ret = pinctrl_generic_add_group(pctldev, grpname, pins, npins, pinmux);
+ if (ret < 0) {
+ dev_err(dev, "error adding group %s: %d\n", grpname, ret);
+ goto put_child;
+ }
+
+ ret = pinconf_generic_parse_dt_config(child, pctldev,
+ &map[nmaps].data.configs.configs,
+ &map[nmaps].data.configs.num_configs);
+ if (ret) {
+ dev_err(dev, "error parsing pin config of group %s: %d\n",
+ grpname, ret);
+ goto put_child;
+ }
+
+ /* don't create a map if there are no pinconf settings */
+ if (map[nmaps].data.configs.num_configs == 0)
+ continue;
+
+ map[nmaps].type = PIN_MAP_TYPE_CONFIGS_GROUP;
+ map[nmaps].data.configs.group_or_pin = grpname;
+ nmaps += 1;
+ }
+
+ ret = pinmux_generic_add_function(pctldev, np->name, pgnames, ngroups, NULL);
+ if (ret < 0) {
+ dev_err(dev, "error adding function %s: %d\n", np->name, ret);
+ goto free_map;
+ }
+
+ *maps = map;
+ *num_maps = nmaps;
+ return 0;
+
+put_child:
+ of_node_put(child);
+free_map:
+ pinctrl_utils_free_map(pctldev, map, nmaps);
+ return ret;
+}
+
+static const struct pinctrl_ops starfive_pinctrl_ops = {
+ .get_groups_count = pinctrl_generic_get_group_count,
+ .get_group_name = pinctrl_generic_get_group_name,
+ .get_group_pins = pinctrl_generic_get_group_pins,
+ .pin_dbg_show = starfive_pin_dbg_show,
+ .dt_node_to_map = starfive_dt_node_to_map,
+ .dt_free_map = pinctrl_utils_free_map,
+};
+
+static int starfive_set_mux(struct pinctrl_dev *pctldev,
+ unsigned int fsel, unsigned int gsel)
+{
+ struct starfive_pinctrl *sfp = pinctrl_dev_get_drvdata(pctldev);
+ struct device *dev = sfp->gc.parent;
+ const struct group_desc *group;
+ const u32 *pinmux;
+ unsigned int i;
+
+ group = pinctrl_generic_get_group(pctldev, gsel);
+ if (!group)
+ return -EINVAL;
+
+ pinmux = group->data;
+ for (i = 0; i < group->num_pins; i++) {
+ u32 v = pinmux[i];
+ unsigned int gpio = starfive_pinmux_to_gpio(v);
+ u32 dout = starfive_pinmux_to_dout(v);
+ u32 doen = starfive_pinmux_to_doen(v);
+ u32 din = starfive_pinmux_to_din(v);
+ void __iomem *reg_dout;
+ void __iomem *reg_doen;
+ void __iomem *reg_din;
+ unsigned long flags;
+
+ dev_dbg(dev, "GPIO%u: dout=0x%x doen=0x%x din=0x%x\n",
+ gpio, dout, doen, din);
+
+ reg_dout = sfp->base + GPON_DOUT_CFG + 8 * gpio;
+ reg_doen = sfp->base + GPON_DOEN_CFG + 8 * gpio;
+ if (din != GPI_NONE)
+ reg_din = sfp->base + GPI_CFG_OFFSET + 4 * din;
+ else
+ reg_din = NULL;
+
+ raw_spin_lock_irqsave(&sfp->lock, flags);
+ writel_relaxed(dout, reg_dout);
+ writel_relaxed(doen, reg_doen);
+ if (reg_din)
+ writel_relaxed(gpio + 2, reg_din);
+ raw_spin_unlock_irqrestore(&sfp->lock, flags);
+ }
+
+ return 0;
+}
+
+static const struct pinmux_ops starfive_pinmux_ops = {
+ .get_functions_count = pinmux_generic_get_function_count,
+ .get_function_name = pinmux_generic_get_function_name,
+ .get_function_groups = pinmux_generic_get_function_groups,
+ .set_mux = starfive_set_mux,
+ .strict = true,
+};
+
+static u16 starfive_padctl_get(struct starfive_pinctrl *sfp,
+ unsigned int pin)
+{
+ void __iomem *reg = sfp->padctl + 4 * (pin / 2);
+ int shift = 16 * (pin % 2);
+
+ return readl_relaxed(reg) >> shift;
+}
+
+static void starfive_padctl_rmw(struct starfive_pinctrl *sfp,
+ unsigned int pin,
+ u16 _mask, u16 _value)
+{
+ void __iomem *reg = sfp->padctl + 4 * (pin / 2);
+ int shift = 16 * (pin % 2);
+ u32 mask = (u32)_mask << shift;
+ u32 value = (u32)_value << shift;
+ unsigned long flags;
+
+ dev_dbg(sfp->gc.parent, "padctl_rmw(%u, 0x%03x, 0x%03x)\n", pin, _mask, _value);
+
+ raw_spin_lock_irqsave(&sfp->lock, flags);
+ value |= readl_relaxed(reg) & ~mask;
+ writel_relaxed(value, reg);
+ raw_spin_unlock_irqrestore(&sfp->lock, flags);
+}
+
+#define PIN_CONFIG_STARFIVE_STRONG_PULL_UP (PIN_CONFIG_END + 1)
+
+static const struct pinconf_generic_params starfive_pinconf_custom_params[] = {
+ { "starfive,strong-pull-up", PIN_CONFIG_STARFIVE_STRONG_PULL_UP, 1 },
+};
+
+#ifdef CONFIG_DEBUG_FS
+static const struct pin_config_item starfive_pinconf_custom_conf_items[] = {
+ PCONFDUMP(PIN_CONFIG_STARFIVE_STRONG_PULL_UP, "input bias strong pull-up", NULL, false),
+};
+
+static_assert(ARRAY_SIZE(starfive_pinconf_custom_conf_items) ==
+ ARRAY_SIZE(starfive_pinconf_custom_params));
+#else
+#define starfive_pinconf_custom_conf_items NULL
+#endif
+
+static int starfive_pinconf_get(struct pinctrl_dev *pctldev,
+ unsigned int pin, unsigned long *config)
+{
+ struct starfive_pinctrl *sfp = pinctrl_dev_get_drvdata(pctldev);
+ int param = pinconf_to_config_param(*config);
+ u16 value = starfive_padctl_get(sfp, pin);
+ bool enabled;
+ u32 arg;
+
+ switch (param) {
+ case PIN_CONFIG_BIAS_DISABLE:
+ enabled = value & PAD_BIAS_DISABLE;
+ arg = 0;
+ break;
+ case PIN_CONFIG_BIAS_PULL_DOWN:
+ enabled = value & PAD_BIAS_PULL_DOWN;
+ arg = 1;
+ break;
+ case PIN_CONFIG_BIAS_PULL_UP:
+ enabled = !(value & PAD_BIAS_MASK);
+ arg = 1;
+ break;
+ case PIN_CONFIG_DRIVE_STRENGTH:
+ enabled = value & PAD_DRIVE_STRENGTH_MASK;
+ arg = starfive_drive_strength_to_max_mA(value & PAD_DRIVE_STRENGTH_MASK);
+ break;
+ case PIN_CONFIG_INPUT_ENABLE:
+ enabled = value & PAD_INPUT_ENABLE;
+ arg = enabled;
+ break;
+ case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
+ enabled = value & PAD_INPUT_SCHMITT_ENABLE;
+ arg = enabled;
+ break;
+ case PIN_CONFIG_SLEW_RATE:
+ enabled = value & PAD_SLEW_RATE_MASK;
+ arg = (value & PAD_SLEW_RATE_MASK) >> PAD_SLEW_RATE_POS;
+ break;
+ case PIN_CONFIG_STARFIVE_STRONG_PULL_UP:
+ enabled = value & PAD_BIAS_STRONG_PULL_UP;
+ arg = enabled;
+ break;
+ default:
+ return -ENOTSUPP;
+ }
+
+ *config = pinconf_to_config_packed(param, arg);
+ return enabled ? 0 : -EINVAL;
+}
+
+static int starfive_pinconf_group_get(struct pinctrl_dev *pctldev,
+ unsigned int gsel, unsigned long *config)
+{
+ const struct group_desc *group;
+
+ group = pinctrl_generic_get_group(pctldev, gsel);
+ if (!group)
+ return -EINVAL;
+
+ return starfive_pinconf_get(pctldev, group->pins[0], config);
+}
+
+static int starfive_pinconf_group_set(struct pinctrl_dev *pctldev,
+ unsigned int gsel,
+ unsigned long *configs,
+ unsigned int num_configs)
+{
+ struct starfive_pinctrl *sfp = pinctrl_dev_get_drvdata(pctldev);
+ const struct group_desc *group;
+ u16 mask, value;
+ int i;
+
+ group = pinctrl_generic_get_group(pctldev, gsel);
+ if (!group)
+ return -EINVAL;
+
+ mask = 0;
+ value = 0;
+ for (i = 0; i < num_configs; i++) {
+ int param = pinconf_to_config_param(configs[i]);
+ u32 arg = pinconf_to_config_argument(configs[i]);
+
+ switch (param) {
+ case PIN_CONFIG_BIAS_DISABLE:
+ mask |= PAD_BIAS_MASK;
+ value = (value & ~PAD_BIAS_MASK) | PAD_BIAS_DISABLE;
+ break;
+ case PIN_CONFIG_BIAS_PULL_DOWN:
+ if (arg == 0)
+ return -ENOTSUPP;
+ mask |= PAD_BIAS_MASK;
+ value = (value & ~PAD_BIAS_MASK) | PAD_BIAS_PULL_DOWN;
+ break;
+ case PIN_CONFIG_BIAS_PULL_UP:
+ if (arg == 0)
+ return -ENOTSUPP;
+ mask |= PAD_BIAS_MASK;
+ value = value & ~PAD_BIAS_MASK;
+ break;
+ case PIN_CONFIG_DRIVE_STRENGTH:
+ mask |= PAD_DRIVE_STRENGTH_MASK;
+ value = (value & ~PAD_DRIVE_STRENGTH_MASK) |
+ starfive_drive_strength_from_max_mA(arg);
+ break;
+ case PIN_CONFIG_INPUT_ENABLE:
+ mask |= PAD_INPUT_ENABLE;
+ if (arg)
+ value |= PAD_INPUT_ENABLE;
+ else
+ value &= ~PAD_INPUT_ENABLE;
+ break;
+ case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
+ mask |= PAD_INPUT_SCHMITT_ENABLE;
+ if (arg)
+ value |= PAD_INPUT_SCHMITT_ENABLE;
+ else
+ value &= ~PAD_INPUT_SCHMITT_ENABLE;
+ break;
+ case PIN_CONFIG_SLEW_RATE:
+ mask |= PAD_SLEW_RATE_MASK;
+ value = (value & ~PAD_SLEW_RATE_MASK) |
+ ((arg << PAD_SLEW_RATE_POS) & PAD_SLEW_RATE_MASK);
+ break;
+ case PIN_CONFIG_STARFIVE_STRONG_PULL_UP:
+ if (arg) {
+ mask |= PAD_BIAS_MASK;
+ value = (value & ~PAD_BIAS_MASK) |
+ PAD_BIAS_STRONG_PULL_UP;
+ } else {
+ mask |= PAD_BIAS_STRONG_PULL_UP;
+ value = value & ~PAD_BIAS_STRONG_PULL_UP;
+ }
+ break;
+ default:
+ return -ENOTSUPP;
+ }
+ }
+
+ for (i = 0; i < group->num_pins; i++)
+ starfive_padctl_rmw(sfp, group->pins[i], mask, value);
+
+ return 0;
+}
+
+#ifdef CONFIG_DEBUG_FS
+static void starfive_pinconf_dbg_show(struct pinctrl_dev *pctldev,
+ struct seq_file *s, unsigned int pin)
+{
+ struct starfive_pinctrl *sfp = pinctrl_dev_get_drvdata(pctldev);
+ u16 value = starfive_padctl_get(sfp, pin);
+
+ seq_printf(s, " (0x%03x)", value);
+}
+#else
+#define starfive_pinconf_dbg_show NULL
+#endif
+
+static const struct pinconf_ops starfive_pinconf_ops = {
+ .pin_config_get = starfive_pinconf_get,
+ .pin_config_group_get = starfive_pinconf_group_get,
+ .pin_config_group_set = starfive_pinconf_group_set,
+ .pin_config_dbg_show = starfive_pinconf_dbg_show,
+ .is_generic = true,
+};
+
+static struct pinctrl_desc starfive_desc = {
+ .name = DRIVER_NAME,
+ .pins = starfive_pins,
+ .npins = ARRAY_SIZE(starfive_pins),
+ .pctlops = &starfive_pinctrl_ops,
+ .pmxops = &starfive_pinmux_ops,
+ .confops = &starfive_pinconf_ops,
+ .owner = THIS_MODULE,
+ .num_custom_params = ARRAY_SIZE(starfive_pinconf_custom_params),
+ .custom_params = starfive_pinconf_custom_params,
+ .custom_conf_items = starfive_pinconf_custom_conf_items,
+};
+
+static int starfive_gpio_request(struct gpio_chip *gc, unsigned int gpio)
+{
+ return pinctrl_gpio_request(gc->base + gpio);
+}
+
+static void starfive_gpio_free(struct gpio_chip *gc, unsigned int gpio)
+{
+ pinctrl_gpio_free(gc->base + gpio);
+}
+
+static int starfive_gpio_get_direction(struct gpio_chip *gc, unsigned int gpio)
+{
+ struct starfive_pinctrl *sfp = container_of(gc, struct starfive_pinctrl, gc);
+ void __iomem *doen = sfp->base + GPON_DOEN_CFG + 8 * gpio;
+
+ if (readl_relaxed(doen) == GPO_ENABLE)
+ return GPIO_LINE_DIRECTION_OUT;
+
+ return GPIO_LINE_DIRECTION_IN;
+}
+
+static int starfive_gpio_direction_input(struct gpio_chip *gc,
+ unsigned int gpio)
+{
+ struct starfive_pinctrl *sfp = container_of(gc, struct starfive_pinctrl, gc);
+ void __iomem *doen = sfp->base + GPON_DOEN_CFG + 8 * gpio;
+ unsigned long flags;
+
+ /* enable input and schmitt trigger */
+ starfive_padctl_rmw(sfp, starfive_gpio_to_pin(sfp, gpio),
+ PAD_INPUT_ENABLE | PAD_INPUT_SCHMITT_ENABLE,
+ PAD_INPUT_ENABLE | PAD_INPUT_SCHMITT_ENABLE);
+
+ raw_spin_lock_irqsave(&sfp->lock, flags);
+ writel_relaxed(GPO_DISABLE, doen);
+ raw_spin_unlock_irqrestore(&sfp->lock, flags);
+ return 0;
+}
+
+static int starfive_gpio_direction_output(struct gpio_chip *gc,
+ unsigned int gpio, int value)
+{
+ struct starfive_pinctrl *sfp = container_of(gc, struct starfive_pinctrl, gc);
+ void __iomem *dout = sfp->base + GPON_DOUT_CFG + 8 * gpio;
+ void __iomem *doen = sfp->base + GPON_DOEN_CFG + 8 * gpio;
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&sfp->lock, flags);
+ writel_relaxed(value, dout);
+ writel_relaxed(GPO_ENABLE, doen);
+ raw_spin_unlock_irqrestore(&sfp->lock, flags);
+
+ /* disable input, schmitt trigger and bias */
+ starfive_padctl_rmw(sfp, starfive_gpio_to_pin(sfp, gpio),
+ PAD_BIAS_MASK | PAD_INPUT_ENABLE | PAD_INPUT_SCHMITT_ENABLE,
+ PAD_BIAS_DISABLE);
+
+ return 0;
+}
+
+static int starfive_gpio_get(struct gpio_chip *gc, unsigned int gpio)
+{
+ struct starfive_pinctrl *sfp = container_of(gc, struct starfive_pinctrl, gc);
+ void __iomem *din = sfp->base + GPIODIN + 4 * (gpio / 32);
+
+ return !!(readl_relaxed(din) & BIT(gpio % 32));
+}
+
+static void starfive_gpio_set(struct gpio_chip *gc, unsigned int gpio,
+ int value)
+{
+ struct starfive_pinctrl *sfp = container_of(gc, struct starfive_pinctrl, gc);
+ void __iomem *dout = sfp->base + GPON_DOUT_CFG + 8 * gpio;
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&sfp->lock, flags);
+ writel_relaxed(value, dout);
+ raw_spin_unlock_irqrestore(&sfp->lock, flags);
+}
+
+static int starfive_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
+ unsigned long config)
+{
+ struct starfive_pinctrl *sfp = container_of(gc, struct starfive_pinctrl, gc);
+ u32 arg = pinconf_to_config_argument(config);
+ u16 value;
+ u16 mask;
+
+ switch (pinconf_to_config_param(config)) {
+ case PIN_CONFIG_BIAS_DISABLE:
+ mask = PAD_BIAS_MASK;
+ value = PAD_BIAS_DISABLE;
+ break;
+ case PIN_CONFIG_BIAS_PULL_DOWN:
+ if (arg == 0)
+ return -ENOTSUPP;
+ mask = PAD_BIAS_MASK;
+ value = PAD_BIAS_PULL_DOWN;
+ break;
+ case PIN_CONFIG_BIAS_PULL_UP:
+ if (arg == 0)
+ return -ENOTSUPP;
+ mask = PAD_BIAS_MASK;
+ value = 0;
+ break;
+ case PIN_CONFIG_DRIVE_PUSH_PULL:
+ return 0;
+ case PIN_CONFIG_INPUT_ENABLE:
+ mask = PAD_INPUT_ENABLE;
+ value = arg ? PAD_INPUT_ENABLE : 0;
+ break;
+ case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
+ mask = PAD_INPUT_SCHMITT_ENABLE;
+ value = arg ? PAD_INPUT_SCHMITT_ENABLE : 0;
+ break;
+ default:
+ return -ENOTSUPP;
+ };
+
+ starfive_padctl_rmw(sfp, starfive_gpio_to_pin(sfp, gpio), mask, value);
+ return 0;
+}
+
+static int starfive_gpio_add_pin_ranges(struct gpio_chip *gc)
+{
+ struct starfive_pinctrl *sfp = container_of(gc, struct starfive_pinctrl, gc);
+
+ sfp->gpios.name = sfp->gc.label;
+ sfp->gpios.base = sfp->gc.base;
+ /*
+ * sfp->gpios.pin_base depends on the chosen signal group
+ * and is set in starfive_probe()
+ */
+ sfp->gpios.npins = NR_GPIOS;
+ sfp->gpios.gc = &sfp->gc;
+ pinctrl_add_gpio_range(sfp->pctl, &sfp->gpios);
+ return 0;
+}
+
+static void starfive_irq_ack(struct irq_data *d)
+{
+ struct starfive_pinctrl *sfp = starfive_from_irq_data(d);
+ irq_hw_number_t gpio = irqd_to_hwirq(d);
+ void __iomem *ic = sfp->base + GPIOIC + 4 * (gpio / 32);
+ u32 mask = BIT(gpio % 32);
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&sfp->lock, flags);
+ writel_relaxed(mask, ic);
+ raw_spin_unlock_irqrestore(&sfp->lock, flags);
+}
+
+static void starfive_irq_mask(struct irq_data *d)
+{
+ struct starfive_pinctrl *sfp = starfive_from_irq_data(d);
+ irq_hw_number_t gpio = irqd_to_hwirq(d);
+ void __iomem *ie = sfp->base + GPIOIE + 4 * (gpio / 32);
+ u32 mask = BIT(gpio % 32);
+ unsigned long flags;
+ u32 value;
+
+ raw_spin_lock_irqsave(&sfp->lock, flags);
+ value = readl_relaxed(ie) & ~mask;
+ writel_relaxed(value, ie);
+ raw_spin_unlock_irqrestore(&sfp->lock, flags);
+}
+
+static void starfive_irq_mask_ack(struct irq_data *d)
+{
+ struct starfive_pinctrl *sfp = starfive_from_irq_data(d);
+ irq_hw_number_t gpio = irqd_to_hwirq(d);
+ void __iomem *ie = sfp->base + GPIOIE + 4 * (gpio / 32);
+ void __iomem *ic = sfp->base + GPIOIC + 4 * (gpio / 32);
+ u32 mask = BIT(gpio % 32);
+ unsigned long flags;
+ u32 value;
+
+ raw_spin_lock_irqsave(&sfp->lock, flags);
+ value = readl_relaxed(ie) & ~mask;
+ writel_relaxed(value, ie);
+ writel_relaxed(mask, ic);
+ raw_spin_unlock_irqrestore(&sfp->lock, flags);
+}
+
+static void starfive_irq_unmask(struct irq_data *d)
+{
+ struct starfive_pinctrl *sfp = starfive_from_irq_data(d);
+ irq_hw_number_t gpio = irqd_to_hwirq(d);
+ void __iomem *ie = sfp->base + GPIOIE + 4 * (gpio / 32);
+ u32 mask = BIT(gpio % 32);
+ unsigned long flags;
+ u32 value;
+
+ raw_spin_lock_irqsave(&sfp->lock, flags);
+ value = readl_relaxed(ie) | mask;
+ writel_relaxed(value, ie);
+ raw_spin_unlock_irqrestore(&sfp->lock, flags);
+}
+
+static int starfive_irq_set_type(struct irq_data *d, unsigned int trigger)
+{
+ struct starfive_pinctrl *sfp = starfive_from_irq_data(d);
+ irq_hw_number_t gpio = irqd_to_hwirq(d);
+ void __iomem *base = sfp->base + 4 * (gpio / 32);
+ u32 mask = BIT(gpio % 32);
+ u32 irq_type, edge_both, polarity;
+ unsigned long flags;
+
+ switch (trigger) {
+ case IRQ_TYPE_EDGE_RISING:
+ irq_type = mask; /* 1: edge triggered */
+ edge_both = 0; /* 0: single edge */
+ polarity = mask; /* 1: rising edge */
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ irq_type = mask; /* 1: edge triggered */
+ edge_both = 0; /* 0: single edge */
+ polarity = 0; /* 0: falling edge */
+ break;
+ case IRQ_TYPE_EDGE_BOTH:
+ irq_type = mask; /* 1: edge triggered */
+ edge_both = mask; /* 1: both edges */
+ polarity = 0; /* 0: ignored */
+ break;
+ case IRQ_TYPE_LEVEL_HIGH:
+ irq_type = 0; /* 0: level triggered */
+ edge_both = 0; /* 0: ignored */
+ polarity = mask; /* 1: high level */
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ irq_type = 0; /* 0: level triggered */
+ edge_both = 0; /* 0: ignored */
+ polarity = 0; /* 0: low level */
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (trigger & IRQ_TYPE_EDGE_BOTH)
+ irq_set_handler_locked(d, handle_edge_irq);
+ else
+ irq_set_handler_locked(d, handle_level_irq);
+
+ raw_spin_lock_irqsave(&sfp->lock, flags);
+ irq_type |= readl_relaxed(base + GPIOIS) & ~mask;
+ writel_relaxed(irq_type, base + GPIOIS);
+ edge_both |= readl_relaxed(base + GPIOIBE) & ~mask;
+ writel_relaxed(edge_both, base + GPIOIBE);
+ polarity |= readl_relaxed(base + GPIOIEV) & ~mask;
+ writel_relaxed(polarity, base + GPIOIEV);
+ raw_spin_unlock_irqrestore(&sfp->lock, flags);
+ return 0;
+}
+
+static struct irq_chip starfive_irq_chip = {
+ .irq_ack = starfive_irq_ack,
+ .irq_mask = starfive_irq_mask,
+ .irq_mask_ack = starfive_irq_mask_ack,
+ .irq_unmask = starfive_irq_unmask,
+ .irq_set_type = starfive_irq_set_type,
+ .flags = IRQCHIP_SET_TYPE_MASKED,
+};
+
+static void starfive_gpio_irq_handler(struct irq_desc *desc)
+{
+ struct starfive_pinctrl *sfp = starfive_from_irq_desc(desc);
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ unsigned long mis;
+ unsigned int pin;
+
+ chained_irq_enter(chip, desc);
+
+ mis = readl_relaxed(sfp->base + GPIOMIS + 0);
+ for_each_set_bit(pin, &mis, 32)
+ generic_handle_domain_irq(sfp->gc.irq.domain, pin);
+
+ mis = readl_relaxed(sfp->base + GPIOMIS + 4);
+ for_each_set_bit(pin, &mis, 32)
+ generic_handle_domain_irq(sfp->gc.irq.domain, pin + 32);
+
+ chained_irq_exit(chip, desc);
+}
+
+static int starfive_gpio_init_hw(struct gpio_chip *gc)
+{
+ struct starfive_pinctrl *sfp = container_of(gc, struct starfive_pinctrl, gc);
+
+ /* mask all GPIO interrupts */
+ writel(0, sfp->base + GPIOIE + 0);
+ writel(0, sfp->base + GPIOIE + 4);
+ /* clear edge interrupt flags */
+ writel(~0U, sfp->base + GPIOIC + 0);
+ writel(~0U, sfp->base + GPIOIC + 4);
+ /* enable GPIO interrupts */
+ writel(1, sfp->base + GPIOEN);
+ return 0;
+}
+
+static void starfive_disable_clock(void *data)
+{
+ clk_disable_unprepare(data);
+}
+
+static int starfive_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct starfive_pinctrl *sfp;
+ struct reset_control *rst;
+ struct clk *clk;
+ u32 value;
+ int ret;
+
+ sfp = devm_kzalloc(dev, sizeof(*sfp), GFP_KERNEL);
+ if (!sfp)
+ return -ENOMEM;
+
+ sfp->base = devm_platform_ioremap_resource_byname(pdev, "gpio");
+ if (IS_ERR(sfp->base))
+ return PTR_ERR(sfp->base);
+
+ sfp->padctl = devm_platform_ioremap_resource_byname(pdev, "padctl");
+ if (IS_ERR(sfp->padctl))
+ return PTR_ERR(sfp->padctl);
+
+ clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(clk))
+ return dev_err_probe(dev, PTR_ERR(clk), "could not get clock\n");
+
+ rst = devm_reset_control_get_exclusive(dev, NULL);
+ if (IS_ERR(rst))
+ return dev_err_probe(dev, PTR_ERR(rst), "could not get reset\n");
+
+ ret = clk_prepare_enable(clk);
+ if (ret)
+ return dev_err_probe(dev, ret, "could not enable clock\n");
+
+ ret = devm_add_action_or_reset(dev, starfive_disable_clock, clk);
+ if (ret)
+ return ret;
+
+ /*
+ * We don't want to assert reset and risk undoing pin muxing for the
+ * early boot serial console, but let's make sure the reset line is
+ * deasserted in case someone runs a really minimal bootloader.
+ */
+ ret = reset_control_deassert(rst);
+ if (ret)
+ return dev_err_probe(dev, ret, "could not deassert reset\n");
+
+ platform_set_drvdata(pdev, sfp);
+ sfp->gc.parent = dev;
+ raw_spin_lock_init(&sfp->lock);
+
+ ret = devm_pinctrl_register_and_init(dev, &starfive_desc, sfp, &sfp->pctl);
+ if (ret)
+ return dev_err_probe(dev, ret, "could not register pinctrl driver\n");
+
+ if (!of_property_read_u32(dev->of_node, "starfive,signal-group", &value)) {
+ if (value > 6)
+ return dev_err_probe(dev, -EINVAL, "invalid signal group %u\n", value);
+ writel(value, sfp->padctl + IO_PADSHARE_SEL);
+ }
+
+ value = readl(sfp->padctl + IO_PADSHARE_SEL);
+ switch (value) {
+ case 0:
+ sfp->gpios.pin_base = PAD_INVALID_GPIO;
+ goto out_pinctrl_enable;
+ case 1:
+ sfp->gpios.pin_base = PAD_GPIO(0);
+ break;
+ case 2:
+ sfp->gpios.pin_base = PAD_FUNC_SHARE(72);
+ break;
+ case 3:
+ sfp->gpios.pin_base = PAD_FUNC_SHARE(70);
+ break;
+ case 4: case 5: case 6:
+ sfp->gpios.pin_base = PAD_FUNC_SHARE(0);
+ break;
+ default:
+ return dev_err_probe(dev, -EINVAL, "invalid signal group %u\n", value);
+ }
+
+ sfp->gc.label = dev_name(dev);
+ sfp->gc.owner = THIS_MODULE;
+ sfp->gc.request = starfive_gpio_request;
+ sfp->gc.free = starfive_gpio_free;
+ sfp->gc.get_direction = starfive_gpio_get_direction;
+ sfp->gc.direction_input = starfive_gpio_direction_input;
+ sfp->gc.direction_output = starfive_gpio_direction_output;
+ sfp->gc.get = starfive_gpio_get;
+ sfp->gc.set = starfive_gpio_set;
+ sfp->gc.set_config = starfive_gpio_set_config;
+ sfp->gc.add_pin_ranges = starfive_gpio_add_pin_ranges;
+ sfp->gc.base = -1;
+ sfp->gc.ngpio = NR_GPIOS;
+
+ starfive_irq_chip.parent_device = dev;
+ starfive_irq_chip.name = sfp->gc.label;
+
+ sfp->gc.irq.chip = &starfive_irq_chip;
+ sfp->gc.irq.parent_handler = starfive_gpio_irq_handler;
+ sfp->gc.irq.num_parents = 1;
+ sfp->gc.irq.parents = devm_kcalloc(dev, sfp->gc.irq.num_parents,
+ sizeof(*sfp->gc.irq.parents), GFP_KERNEL);
+ if (!sfp->gc.irq.parents)
+ return -ENOMEM;
+ sfp->gc.irq.default_type = IRQ_TYPE_NONE;
+ sfp->gc.irq.handler = handle_bad_irq;
+ sfp->gc.irq.init_hw = starfive_gpio_init_hw;
+
+ ret = platform_get_irq(pdev, 0);
+ if (ret < 0)
+ return ret;
+ sfp->gc.irq.parents[0] = ret;
+
+ ret = devm_gpiochip_add_data(dev, &sfp->gc, sfp);
+ if (ret)
+ return dev_err_probe(dev, ret, "could not register gpiochip\n");
+
+out_pinctrl_enable:
+ return pinctrl_enable(sfp->pctl);
+}
+
+static const struct of_device_id starfive_of_match[] = {
+ { .compatible = "starfive,jh7100-pinctrl" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, starfive_of_match);
+
+static struct platform_driver starfive_pinctrl_driver = {
+ .probe = starfive_probe,
+ .driver = {
+ .name = DRIVER_NAME,
+ .of_match_table = starfive_of_match,
+ },
+};
+module_platform_driver(starfive_pinctrl_driver);
+
+MODULE_DESCRIPTION("Pinctrl driver for StarFive SoCs");
+MODULE_AUTHOR("Emil Renner Berthing <kernel@esmil.dk>");
+MODULE_LICENSE("GPL v2");
--
2.33.1