[PATCH v1 12/16] pinctrl: starfive: Add pinctrl driver for StarFive SoCs

Emil Renner Berthing
2021-10-12T13:42:48Z

Add a combined pinctrl and gpio driver for the StarFive JH7100 SoC.

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 pinmuxing
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.

Co-developed-by: Huan Feng <huan.feng@starfivetech.com>
Signed-off-by: Huan Feng <huan.feng@starfivetech.com>
Co-developed-by: Drew Fustini <drew@beagleboard.org>
Signed-off-by: Drew Fustini <drew@beagleboard.org>
Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
---
MAINTAINERS | 8 +
drivers/pinctrl/Kconfig | 17 +
drivers/pinctrl/Makefile | 1 +
drivers/pinctrl/pinctrl-starfive.c | 1439 ++++++++++++++++++++++++++++
4 files changed, 1465 insertions(+)
create mode 100644 drivers/pinctrl/pinctrl-starfive.c

diff --git a/MAINTAINERS b/MAINTAINERS
index f7883377895e..4a34a8a9c987 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -17854,6 +17854,14 @@ 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 31921108e456..2f3d37b075c5 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -265,6 +265,23 @@ config PINCTRL_ST
select PINCONF
select GPIOLIB_IRQCHIP

+config PINCTRL_STARFIVE
+ bool "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 200073bcc2c1..9c258047f11c 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -38,6 +38,7 @@ 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..e3b5a2f53fe1
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-starfive.c
@@ -0,0 +1,1439 @@
+// 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/clk.h>
+#include <linux/gpio/driver.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+#include <linux/spinlock.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 JH7100 datasheet:
+ * https://github.com/starfive-tech/StarLight_Docs
+ */
+#define MAX_GPIO 64
+
+/*
+ * Global enable for GPIO interrupts, offset: 0x0, field: GPIOEN
+ * set to 1 if GPIO interrupts are enabled, set to 0 to disable
+ */
+#define IRQ_GLOBAL_EN 0x0
+
+/*
+ * Interrupt Type for GPIO[31:0], offset: 0x10, field: GPIOS_0
+ * set to 1 if edge-triggered, set to 0 for level-triggered
+ */
+#define IRQ_TYPE_LOW 0x10
+
+/*
+ * Interrupt Type for GPIO[63:32], offset: 0x14, field: GPIOS_1
+ */
+#define IRQ_TYPE_HIGH 0x14
+
+/*
+ * Edge-Triggered Interrupt Type for GPIO[31:0], offset: 0x18, field: GPIOIBE_0
+ * set to 1 if both positive and negative edge, set to 0 if single edge
+ */
+#define IRQ_EDGE_BOTH_LOW 0x18
+
+/*
+ * Edge-Triggered Interrupt Type for GPIO[63:32], offset: 0x1c, field: GPIOIBE_1
+ */
+#define IRQ_EDGE_BOTH_HIGH 0x1c
+
+/*
+ * Interrupt Trigger Polarity for GPIO[31:0], offset: 0x20, field: GPIOEV_0
+ * for edge-triggered on single edge, set to 1 for rising edge, 0 for falling edge
+ * for edge-triggered on both edges, this field is ignored
+ * for level-triggered, set to 1 for high level, 0 for low level
+ */
+#define IRQ_POLARITY_LOW 0x20
+
+/*
+ * Interrupt Trigger Polarity for GPIO[63:32], offset: 0x24, field: GPIOEV_1
+ */
+#define IRQ_POLARITY_HIGH 0x24
+
+/*
+ * Interrupt Enable for GPIO[31:0], offset: 0x28, field: GPIOIE_0
+ * set to 1 to enable (unmask) the interrupt, set to 0 to disable (mask)
+ */
+#define IRQ_ENABLE_LOW 0x28
+
+/*
+ * Interrupt Mask for GPIO[63:32], offset: 0x2c, field: GPIOIE_1
+ */
+#define IRQ_ENABLE_HIGH 0x2c
+
+/*
+ * Clear Edge-Triggered Interrupts GPIO[31:0], offset: 0x30, field: GPIOC_0
+ * set to 1 to clear edge-triggered interrupt
+ */
+#define IRQ_CLEAR_EDGE_LOW 0x30
+
+/*
+ * Clear Edge-Triggered Interrupts GPIO[63:32], offset: 0x34, field: GPIOC_1
+ */
+#define IRQ_CLEAR_EDGE_HIGH 0x34
+
+/*
+ * Edge-Triggered Interrupt Status GPIO[31:0], offset: 0x38, field: GPIORIS_0
+ * value of 1 means edge detected, value of 0 means no edge detected
+ */
+#define IRQ_EDGE_STATUS_LOW 0x38
+
+/*
+ * Edge-Triggered Interrupt Status GPIO[63:32], offset: 0x3C, field: GPIORIS_1
+ */
+#define IRQ_EDGE_STATUS_HIGH 0x3c
+
+/*
+ * Interrupt Status after Masking GPIO[31:0], offset: 0x40, field: GPIOMIS_0
+ * status of edge-triggered or level-triggered after masking
+ * value of 1 means edge or level was detected, value of 0 menas not detected
+ */
+#define IRQ_MASKED_STATUS_LOW 0x40
+
+/*
+ * Interrupt Status after Masking GPIO[63:32], offset: 0x44, field: GPIOMIS_1
+ */
+#define IRQ_MASKED_STATUS_HIGH 0x44
+
+/*
+ * Data Value of GPIO for GPIO[31:0], offest: 0x48, field: GPIODIN_0
+ * dynamically reflects value on the GPIO pin
+ */
+#define GPIO_DIN_LOW 0x48
+
+/*
+ * Data Value of GPIO for GPIO[63:32], offest: 0x4C, field: GPIODIN_1
+ */
+#define GPIO_DIN_HIGH 0x4c
+
+/*
+ * From datasheet section 12.2, there are 64 output data config registers which
+ * are 4 bytes wide. There are 64 output enable config registers which are 4
+ * bytes wide too. Output data and output enable registers for a given GPIO pad
+ * are contiguous. Thus GPIO0_DOUT_CFG is 0x50 and GPIO0_DOEN_CFG is 0x54 while
+ * GPIO1_DOUT_CFG is 0x58 and GPIO1_DOEN_CFG is 0x5C. The stride between GPIO
+ * GPIO pads is effectively 8, thus: GPIOn_DOUT_CFG is 0x50+8n
+ */
+#define GPIO_N_DOUT_CFG 0x50
+
+/*
+ * GPIO0_DOEN_CFG is 0x54, GPIOn_DOEN_CFG is 0x54+8n
+ */
+#define GPIO_N_DOEN_CFG 0x54
+
+/*
+ * 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 GPIO_IN_OFFSET 0x250
+
+/*
+ * From Section 11, IO_PADSHARE_SEL register can be programmed to select one of
+ * pre-defined multiplexed signal groups on PAD_FUNC_SHARE and PAD_GPIO pads.
+ * This is a global setting. Per Table 11-1, setting IO_PADSHARE_SEL to 6 would
+ * result in GPIO[63:0] being mapped to PAD_FUNC_SHARE[63:0]
+ */
+#define IO_PADSHARE_SEL 0x1a0
+
+#define PAD_SLEW_RATE_MASK 0xe00U
+#define PAD_SLEW_RATE_POS 9
+#define PAD_BIAS_STRONG_PULL_UP 0x100U
+#define PAD_INPUT_ENABLE 0x080U
+#define PAD_INPUT_SCHMITT_ENABLE 0x040U
+#define PAD_BIAS_DISABLE 0x020U
+#define PAD_BIAS_PULL_DOWN 0x010U
+#define PAD_BIAS_MASK 0x130U
+#define PAD_DRIVE_STRENGTH_MASK 0x007U
+#define PAD_DRIVE_STRENGTH_POS 0
+
+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 struct device *starfive_dev(const struct starfive_pinctrl *sfp)
+{
+ return sfp->gc.parent;
+}
+
+static unsigned int starfive_pin_to_gpio(const struct starfive_pinctrl *sfp,
+ unsigned int pin)
+{
+ return pin - sfp->gpios.pin_base;
+}
+
+static 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_gc(struct gpio_chip *gc)
+{
+ return container_of(gc, struct starfive_pinctrl, gc);
+}
+
+static struct starfive_pinctrl *starfive_from_irq_data(struct irq_data *d)
+{
+ return starfive_from_gc(irq_data_get_irq_chip_data(d));
+}
+
+static struct starfive_pinctrl *starfive_from_irq_desc(struct irq_desc *desc)
+{
+ return starfive_from_gc(irq_desc_get_handler_data(desc));
+}
+
+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 >= MAX_GPIO)
+ return;
+
+ reg = sfp->base + GPIO_N_DOUT_CFG + 8 * gpio;
+ dout = readl_relaxed(reg);
+ reg += 4;
+ doen = readl_relaxed(reg);
+
+ seq_printf(s, "dout=%u%s doen=%u%s",
+ dout & 0xffU, (dout & 0x80000000U) ? "r" : "",
+ doen & 0xffU, (doen & 0x80000000U) ? "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 = starfive_dev(sfp);
+ const char **pgnames;
+ struct pinctrl_map *map;
+ struct device_node *child;
+ const char *grpname;
+ int *pins;
+ u32 *pinmux;
+ int nmaps;
+ int ngroups;
+ int ret;
+
+ nmaps = 0;
+ ngroups = 0;
+ for_each_child_of_node(np, child) {
+ const __be32 *pinmux_list;
+ const __be32 *pins_list;
+ int pinmux_size;
+ int pins_size;
+
+ pinmux_list = of_get_property(child, "pinmux", &pinmux_size);
+ pins_list = of_get_property(child, "pins", &pins_size);
+ if (pinmux_list && pins_list) {
+ dev_err(dev, "invalid pinctrl group %pOFn.%pOFn: %s\n",
+ np, child, "both pinmux and pins set");
+ of_node_put(child);
+ return -EINVAL;
+ }
+
+ if (pinmux_list && pinmux_size > 0) {
+ nmaps += 2;
+ } else if (pins_list && pins_size > 0) {
+ nmaps += 1;
+ } else {
+ dev_err(dev, "invalid pinctrl group %pOFn.%pOFn: %s\n",
+ np, child, "neither pinmux nor pins set");
+ of_node_put(child);
+ return -EINVAL;
+ }
+ ngroups += 1;
+ }
+
+ ret = -ENOMEM;
+ pgnames = devm_kcalloc(dev, ngroups, sizeof(*pgnames), GFP_KERNEL);
+ if (!pgnames)
+ goto out;
+
+ map = kcalloc(nmaps, sizeof(*map), GFP_KERNEL);
+ if (!map)
+ goto free_pgnames;
+
+ nmaps = 0;
+ ngroups = 0;
+ for_each_child_of_node(np, child) {
+ const __be32 *list;
+ int npins;
+ int i;
+
+ ret = -ENOMEM;
+ grpname = devm_kasprintf(dev, GFP_KERNEL, "%s.%s", np->name, child->name);
+ if (!grpname)
+ goto put_child;
+
+ pgnames[ngroups++] = grpname;
+
+ if ((list = of_get_property(child, "pinmux", &npins))) {
+ npins /= sizeof(*list);
+
+ pins = devm_kcalloc(dev, npins, sizeof(*pins), GFP_KERNEL);
+ if (!pins)
+ goto free_grpname;
+
+ pinmux = devm_kcalloc(dev, npins, sizeof(*pinmux), GFP_KERNEL);
+ if (!pinmux)
+ goto free_pins;
+
+ for (i = 0; i < npins; i++) {
+ u32 v = be32_to_cpu(*list++);
+
+ pins[i] = starfive_gpio_to_pin(sfp, v & (MAX_GPIO - 1));
+ pinmux[i] = v;
+ }
+
+ 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 ((list = of_get_property(child, "pins", &npins))) {
+ npins /= sizeof(*list);
+
+ pins = devm_kcalloc(dev, npins, sizeof(*pins), GFP_KERNEL);
+ if (!pins)
+ goto free_grpname;
+
+ pinmux = NULL;
+
+ for (i = 0; i < npins; i++)
+ pins[i] = be32_to_cpu(*list++);
+ } else {
+ ret = -EINVAL;
+ goto free_grpname;
+ }
+
+ ret = pinctrl_generic_add_group(pctldev, grpname, pins, npins, pinmux);
+ if (ret < 0) {
+ dev_err(dev, "error adding group %pOFn.%pOFn: %d\n",
+ np, child, ret);
+ goto free_pinmux;
+ }
+
+ ret = pinconf_generic_parse_dt_config(child, pctldev,
+ &map[nmaps].data.configs.configs,
+ &map[nmaps].data.configs.num_configs);
+ if (ret) {
+ dev_err(dev, "invalid pinctrl group %pOFn.%pOFn: %s\n",
+ np, child, "error parsing pin config");
+ 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 %pOFn: %d\n", np, ret);
+ goto free_map;
+ }
+
+ *maps = map;
+ *num_maps = nmaps;
+ return 0;
+
+free_pinmux:
+ devm_kfree(dev, pinmux);
+free_pins:
+ devm_kfree(dev, pins);
+free_grpname:
+ devm_kfree(dev, grpname);
+put_child:
+ of_node_put(child);
+free_map:
+ pinctrl_utils_free_map(pctldev, map, nmaps);
+free_pgnames:
+ devm_kfree(dev, pgnames);
+out:
+ 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 = starfive_dev(sfp);
+ const struct group_desc *group;
+ const u32 *pinmux;
+ unsigned int i;
+
+ group = pinctrl_generic_get_group(pctldev, gsel);
+ if (unlikely(!group))
+ return -EINVAL;
+
+ pinmux = group->data;
+ for (i = 0; i < group->num_pins; i++) {
+ unsigned int gpio = starfive_pin_to_gpio(sfp, group->pins[i]);
+ void __iomem *reg_dout;
+ void __iomem *reg_doen;
+ void __iomem *reg_din;
+ u32 v, dout, doen, din;
+ unsigned long flags;
+
+ if (dev_WARN_ONCE(dev, gpio >= MAX_GPIO,
+ "%s: invalid gpiomux pin", group->name))
+ continue;
+
+ v = pinmux[i];
+ dout = ((v & BIT(7)) << (31 - 7)) | ((v >> 24) & 0xffU);
+ doen = ((v & BIT(6)) << (31 - 6)) | ((v >> 16) & 0xffU);
+ din = (v >> 8) & 0xffU;
+
+ dev_dbg(dev, "GPIO%u: dout=0x%x doen=0x%x din=0x%x\n",
+ gpio, dout, doen, din);
+
+ reg_dout = sfp->base + GPIO_N_DOUT_CFG + 8 * gpio;
+ reg_doen = sfp->base + GPIO_N_DOEN_CFG + 8 * gpio;
+ if (din != 0xff)
+ reg_din = sfp->base + GPIO_IN_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);
+ u32 value = readl_relaxed(reg);
+
+ if (pin & 1U)
+ value >>= 16;
+ return value;
+}
+
+static void starfive_padctl_rmw(struct starfive_pinctrl *sfp,
+ unsigned int pin,
+ u16 _mask, u16 _value)
+{
+ void __iomem *reg = sfp->padctl + 4 * (pin / 2);
+ u32 mask = _mask;
+ u32 value = _value;
+ unsigned long flags;
+
+ dev_dbg(starfive_dev(sfp),
+ "padctl_rmw(%u, 0x%03x, 0x%03x)\n", pin, mask, value);
+
+ if (pin & 1U) {
+ value <<= 16;
+ mask <<= 16;
+ }
+
+ 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[ARRAY_SIZE(starfive_pinconf_custom_params)] = {
+ PCONFDUMP(PIN_CONFIG_STARFIVE_STRONG_PULL_UP, "input bias strong pull-up", NULL, false),
+};
+#else
+#define starfive_pinconf_custom_conf_items NULL
+#endif
+
+static const unsigned char starfive_drive_strength[] = {
+ 14, 21, 28, 35, 42, 49, 56, 63,
+};
+
+static int starfive_pinconf_get(struct pinctrl_dev *pctldev,
+ unsigned int pin, unsigned long *config)
+{
+ struct starfive_pinctrl *sfp = pinctrl_dev_get_drvdata(pctldev);
+ u16 value = starfive_padctl_get(sfp, pin);
+ int param = pinconf_to_config_param(*config);
+ u32 arg;
+ bool enabled;
+
+ 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[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 (unlikely(!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 (unlikely(!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]);
+ u16 ds;
+
+ 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:
+ for (ds = 0; ds < PAD_DRIVE_STRENGTH_MASK; ds++) {
+ if (arg < starfive_drive_strength[ds + 1])
+ break;
+ }
+ mask |= PAD_DRIVE_STRENGTH_MASK;
+ value = (value & ~PAD_DRIVE_STRENGTH_MASK) | ds;
+ 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 = starfive_from_gc(gc);
+
+ if (gpio >= MAX_GPIO)
+ return -EINVAL;
+
+ /* return GPIO_LINE_DIRECTION_OUT (0) only if doen == GPO_ENABLE (0) */
+ return readl_relaxed(sfp->base + GPIO_N_DOEN_CFG + 8 * gpio) != GPO_ENABLE;
+}
+
+static int starfive_gpio_direction_input(struct gpio_chip *gc,
+ unsigned int gpio)
+{
+ struct starfive_pinctrl *sfp = starfive_from_gc(gc);
+ unsigned long flags;
+
+ if (gpio >= MAX_GPIO)
+ return -EINVAL;
+
+ /* 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, sfp->base + GPIO_N_DOEN_CFG + 8 * gpio);
+ 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 = starfive_from_gc(gc);
+ unsigned long flags;
+
+ if (gpio >= MAX_GPIO)
+ return -EINVAL;
+
+ raw_spin_lock_irqsave(&sfp->lock, flags);
+ writel_relaxed(value, sfp->base + GPIO_N_DOUT_CFG + 8 * gpio);
+ writel_relaxed(GPO_ENABLE, sfp->base + GPIO_N_DOEN_CFG + 8 * gpio);
+ 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 = starfive_from_gc(gc);
+ u32 value;
+
+ if (gpio >= MAX_GPIO)
+ return -EINVAL;
+
+ if (gpio < 32) {
+ value = readl_relaxed(sfp->base + GPIO_DIN_LOW);
+ value = (value >> gpio) & 1U;
+ } else {
+ value = readl_relaxed(sfp->base + GPIO_DIN_HIGH);
+ value = (value >> (gpio - 32)) & 1U;
+ }
+
+ return value;
+}
+
+static void starfive_gpio_set(struct gpio_chip *gc, unsigned int gpio,
+ int value)
+{
+ struct starfive_pinctrl *sfp = starfive_from_gc(gc);
+ unsigned long flags;
+
+ if (gpio >= MAX_GPIO)
+ return;
+
+ raw_spin_lock_irqsave(&sfp->lock, flags);
+ writel_relaxed(value, sfp->base + GPIO_N_DOUT_CFG + 8 * gpio);
+ 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 = starfive_from_gc(gc);
+ u32 arg = pinconf_to_config_argument(config);
+ u16 mask;
+ u16 value;
+
+ 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 = starfive_from_gc(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 = MAX_GPIO;
+ 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);
+ unsigned long flags;
+ void __iomem *ic;
+ u32 mask;
+
+ if (gpio < 0 || gpio >= MAX_GPIO)
+ return;
+
+ if (gpio < 32) {
+ ic = sfp->base + IRQ_CLEAR_EDGE_LOW;
+ mask = BIT(gpio);
+ } else {
+ ic = sfp->base + IRQ_CLEAR_EDGE_HIGH;
+ mask = BIT(gpio - 32);
+ }
+
+ 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);
+ unsigned long flags;
+ void __iomem *ie;
+ u32 mask, value;
+
+ if (gpio < 0 || gpio >= MAX_GPIO)
+ return;
+
+ if (gpio < 32) {
+ ie = sfp->base + IRQ_ENABLE_LOW;
+ mask = BIT(gpio);
+ } else {
+ ie = sfp->base + IRQ_ENABLE_HIGH;
+ mask = BIT(gpio - 32);
+ }
+
+ raw_spin_lock_irqsave(&sfp->lock, flags);
+ value = readl_relaxed(ie);
+ value &= ~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);
+ unsigned long flags;
+ void __iomem *ie;
+ void __iomem *ic;
+ u32 mask, value;
+
+ if (gpio < 0 || gpio >= MAX_GPIO)
+ return;
+
+ if (gpio < 32) {
+ ie = sfp->base + IRQ_ENABLE_LOW;
+ ic = sfp->base + IRQ_CLEAR_EDGE_LOW;
+ mask = BIT(gpio);
+ } else {
+ ie = sfp->base + IRQ_ENABLE_HIGH;
+ ic = sfp->base + IRQ_CLEAR_EDGE_HIGH;
+ mask = BIT(gpio - 32);
+ }
+
+ raw_spin_lock_irqsave(&sfp->lock, flags);
+ value = readl_relaxed(ie);
+ value &= ~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);
+ unsigned long flags;
+ void __iomem *ie;
+ u32 mask, value;
+
+ if (gpio < 0 || gpio >= MAX_GPIO)
+ return;
+
+ if (gpio < 32) {
+ ie = sfp->base + IRQ_ENABLE_LOW;
+ mask = BIT(gpio);
+ } else {
+ ie = sfp->base + IRQ_ENABLE_HIGH;
+ mask = BIT(gpio - 32);
+ }
+
+ raw_spin_lock_irqsave(&sfp->lock, flags);
+ value = readl_relaxed(ie);
+ value |= 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);
+ unsigned long flags;
+ void __iomem *base;
+ u32 mask, irq_type, edge_both, polarity;
+
+ if (gpio < 0 || gpio >= MAX_GPIO)
+ return -EINVAL;
+
+ if (gpio < 32) {
+ base = sfp->base;
+ mask = BIT(gpio);
+ } else {
+ base = sfp->base + 4;
+ mask = BIT(gpio - 32);
+ }
+
+ switch (trigger) {
+ case IRQ_TYPE_EDGE_RISING:
+ irq_set_handler_locked(d, handle_edge_irq);
+ irq_type = mask; /* 1: edge triggered */
+ edge_both = 0; /* 0: single edge */
+ polarity = mask; /* 1: rising edge */
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ irq_set_handler_locked(d, handle_edge_irq);
+ irq_type = mask; /* 1: edge triggered */
+ edge_both = 0; /* 0: single edge */
+ polarity = 0; /* 0: falling edge */
+ break;
+ case IRQ_TYPE_EDGE_BOTH:
+ irq_set_handler_locked(d, handle_edge_irq);
+ irq_type = mask; /* 1: edge triggered */
+ edge_both = mask; /* 1: both edges */
+ polarity = 0; /* 0: ignored */
+ break;
+ case IRQ_TYPE_LEVEL_HIGH:
+ irq_set_handler_locked(d, handle_level_irq);
+ irq_type = 0; /* 0: level trigged */
+ edge_both = 0; /* 0: ignored */
+ polarity = mask; /* 1: high level */
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ irq_set_handler_locked(d, handle_level_irq);
+ irq_type = 0; /* 0: level triggered */
+ edge_both = 0; /* 0: ignored */
+ polarity = 0; /* 0: low level */
+ break;
+ default:
+ irq_set_handler_locked(d, handle_bad_irq);
+ return -ENOTSUPP;
+ }
+
+ raw_spin_lock_irqsave(&sfp->lock, flags);
+ irq_type |= readl_relaxed(base + IRQ_TYPE_LOW) & ~mask;
+ writel_relaxed(irq_type, base + IRQ_TYPE_LOW);
+ edge_both |= readl_relaxed(base + IRQ_EDGE_BOTH_LOW) & ~mask;
+ writel_relaxed(edge_both, base + IRQ_EDGE_BOTH_LOW);
+ polarity |= readl_relaxed(base + IRQ_POLARITY_LOW) & ~mask;
+ writel_relaxed(polarity, base + IRQ_POLARITY_LOW);
+ 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 + IRQ_MASKED_STATUS_LOW);
+ for_each_set_bit(pin, &mis, 32)
+ generic_handle_domain_irq(sfp->gc.irq.domain, pin);
+
+ mis = readl_relaxed(sfp->base + IRQ_MASKED_STATUS_HIGH);
+ 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 = starfive_from_gc(gc);
+
+ /* mask all GPIO interrupts */
+ writel(0, sfp->base + IRQ_ENABLE_LOW);
+ writel(0, sfp->base + IRQ_ENABLE_HIGH);
+ /* clear edge interrupt flags */
+ writel(~0U, sfp->base + IRQ_CLEAR_EDGE_LOW);
+ writel(~0U, sfp->base + IRQ_CLEAR_EDGE_HIGH);
+ /* enable GPIO interrupts */
+ writel(1, sfp->base + IRQ_GLOBAL_EN);
+ return 0;
+}
+
+static int __init starfive_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct starfive_pinctrl *sfp;
+ struct clk *clk;
+ struct reset_control *rst;
+ 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)) {
+ ret = PTR_ERR(clk);
+ dev_err(dev, "could not get clock: %d\n", ret);
+ return ret;
+ }
+
+ rst = devm_reset_control_get_exclusive(dev, NULL);
+ if (IS_ERR(rst)) {
+ ret = PTR_ERR(rst);
+ dev_err(dev, "could not get reset: %d\n", ret);
+ return ret;
+ }
+
+ ret = reset_control_assert(rst);
+ if (ret) {
+ dev_err(dev, "could not assert reset: %d\n", ret);
+ return ret;
+ }
+
+ ret = clk_prepare_enable(clk);
+ if (ret) {
+ reset_control_deassert(rst);
+ dev_err(dev, "could not enable clock: %d\n", ret);
+ return ret;
+ }
+
+ ret = reset_control_deassert(rst);
+ if (ret) {
+ dev_err(dev, "could not deassert reset: %d\n", ret);
+ return ret;
+ }
+
+ 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) {
+ dev_err(dev, "could not register pinctrl driver: %d\n", ret);
+ return ret;
+ }
+
+ if (!of_property_read_u32(dev->of_node, "starfive,signal-group", &value)) {
+ if (value <= 6)
+ writel(value, sfp->padctl + IO_PADSHARE_SEL);
+ else
+ dev_err(dev, "invalid signal group %u\n", value);
+ }
+
+ value = readl(sfp->padctl + IO_PADSHARE_SEL);
+ switch (value) {
+ case 0:
+ sfp->gpios.pin_base = 0x10000;
+ goto done;
+ 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:
+ dev_err(dev, "invalid signal group %u\n", value);
+ return -EINVAL;
+ }
+
+ sfp->gc.label = dev_name(dev);
+ sfp->gc.of_node = dev->of_node;
+ 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 = MAX_GPIO;
+
+ 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.parents =
+ devm_kcalloc(dev, 1, sizeof(*sfp->gc.irq.parents), GFP_KERNEL);
+ if (!sfp->gc.irq.parents)
+ return -ENOMEM;
+ sfp->gc.irq.num_parents = 1;
+ 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) {
+ dev_err(dev, "could not register gpiochip: %d\n", ret);
+ return ret;
+ }
+
+ dev_info(dev, "StarFive GPIO chip registered %d GPIOs\n", sfp->gc.ngpio);
+done:
+ 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");
--
2.33.0