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linux/drivers/pinctrl/pinctrl-starfive.c
Geert Uytterhoeven 48bd5c381c pinctrl: starfive: Make the irqchip immutable 
Commit 6c846d026d ("gpio: Don't fiddle with irqchips marked as
immutable") added a warning to indicate if the gpiolib is altering the
internals of irqchips.  Following this change the following warning is
now observed for the starfive driver:

    gpio gpiochip0: (11910000.pinctrl): not an immutable chip, please consider fixing it!

Fix this by making the irqchip in the starfive driver immutable.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/5eb66be34356afd5eb0ea9027329e0939d03d3a0.1652884852.git.geert+renesas@glider.be
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2022-05-19 15:16:29 +02:00

1360 lines
41 KiB
C
Raw Blame History

// 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);
gpiochip_disable_irq(&sfp->gc, d->hwirq);
}
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;
gpiochip_enable_irq(&sfp->gc, d->hwirq);
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 const struct irq_chip starfive_irq_chip = {
.name = "StarFive GPIO",
.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_IMMUTABLE | IRQCHIP_SET_TYPE_MASKED,
GPIOCHIP_IRQ_RESOURCE_HELPERS,
};
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;
gpio_irq_chip_set_chip(&sfp->gc.irq, &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");
irq_domain_set_pm_device(sfp->gc.irq.domain, dev);
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");
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