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linux-sg2042/drivers/pinctrl/pinctrl-ocelot.c

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// SPDX-License-Identifier: (GPL-2.0 OR MIT)
/*
* Microsemi SoCs pinctrl driver
*
* Author: <alexandre.belloni@free-electrons.com>
* License: Dual MIT/GPL
* Copyright (c) 2017 Microsemi Corporation
*/
#include <linux/gpio/driver.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include "core.h"
#include "pinconf.h"
#include "pinmux.h"
#define OCELOT_GPIO_OUT_SET 0x0
#define OCELOT_GPIO_OUT_CLR 0x4
#define OCELOT_GPIO_OUT 0x8
#define OCELOT_GPIO_IN 0xc
#define OCELOT_GPIO_OE 0x10
#define OCELOT_GPIO_INTR 0x14
#define OCELOT_GPIO_INTR_ENA 0x18
#define OCELOT_GPIO_INTR_IDENT 0x1c
#define OCELOT_GPIO_ALT0 0x20
#define OCELOT_GPIO_ALT1 0x24
#define OCELOT_GPIO_SD_MAP 0x28
#define OCELOT_PINS 22
#define OCELOT_FUNC_PER_PIN 4
enum {
FUNC_NONE,
FUNC_GPIO,
FUNC_IRQ0_IN,
FUNC_IRQ0_OUT,
FUNC_IRQ1_IN,
FUNC_IRQ1_OUT,
FUNC_MIIM1,
FUNC_PCI_WAKE,
FUNC_PTP0,
FUNC_PTP1,
FUNC_PTP2,
FUNC_PTP3,
FUNC_PWM,
FUNC_RECO_CLK0,
FUNC_RECO_CLK1,
FUNC_SFP0,
FUNC_SFP1,
FUNC_SFP2,
FUNC_SFP3,
FUNC_SFP4,
FUNC_SFP5,
FUNC_SG0,
FUNC_SI,
FUNC_TACHO,
FUNC_TWI,
FUNC_TWI_SCL_M,
FUNC_UART,
FUNC_UART2,
FUNC_MAX
};
static const char *const ocelot_function_names[] = {
[FUNC_NONE] = "none",
[FUNC_GPIO] = "gpio",
[FUNC_IRQ0_IN] = "irq0_in",
[FUNC_IRQ0_OUT] = "irq0_out",
[FUNC_IRQ1_IN] = "irq1_in",
[FUNC_IRQ1_OUT] = "irq1_out",
[FUNC_MIIM1] = "miim1",
[FUNC_PCI_WAKE] = "pci_wake",
[FUNC_PTP0] = "ptp0",
[FUNC_PTP1] = "ptp1",
[FUNC_PTP2] = "ptp2",
[FUNC_PTP3] = "ptp3",
[FUNC_PWM] = "pwm",
[FUNC_RECO_CLK0] = "reco_clk0",
[FUNC_RECO_CLK1] = "reco_clk1",
[FUNC_SFP0] = "sfp0",
[FUNC_SFP1] = "sfp1",
[FUNC_SFP2] = "sfp2",
[FUNC_SFP3] = "sfp3",
[FUNC_SFP4] = "sfp4",
[FUNC_SFP5] = "sfp5",
[FUNC_SG0] = "sg0",
[FUNC_SI] = "si",
[FUNC_TACHO] = "tacho",
[FUNC_TWI] = "twi",
[FUNC_TWI_SCL_M] = "twi_scl_m",
[FUNC_UART] = "uart",
[FUNC_UART2] = "uart2",
};
struct ocelot_pmx_func {
const char **groups;
unsigned int ngroups;
};
struct ocelot_pin_caps {
unsigned int pin;
unsigned char functions[OCELOT_FUNC_PER_PIN];
};
struct ocelot_pinctrl {
struct device *dev;
struct pinctrl_dev *pctl;
struct gpio_chip gpio_chip;
struct regmap *map;
struct ocelot_pmx_func func[FUNC_MAX];
};
#define OCELOT_P(p, f0, f1, f2) \
static struct ocelot_pin_caps ocelot_pin_##p = { \
.pin = p, \
.functions = { \
FUNC_GPIO, FUNC_##f0, FUNC_##f1, FUNC_##f2, \
}, \
}
OCELOT_P(0, SG0, NONE, NONE);
OCELOT_P(1, SG0, NONE, NONE);
OCELOT_P(2, SG0, NONE, NONE);
OCELOT_P(3, SG0, NONE, NONE);
OCELOT_P(4, IRQ0_IN, IRQ0_OUT, TWI);
OCELOT_P(5, IRQ1_IN, IRQ1_OUT, PCI_WAKE);
OCELOT_P(6, UART, TWI_SCL_M, NONE);
OCELOT_P(7, UART, TWI_SCL_M, NONE);
OCELOT_P(8, SI, TWI_SCL_M, IRQ0_OUT);
OCELOT_P(9, SI, TWI_SCL_M, IRQ1_OUT);
OCELOT_P(10, PTP2, TWI_SCL_M, SFP0);
OCELOT_P(11, PTP3, TWI_SCL_M, SFP1);
OCELOT_P(12, UART2, TWI_SCL_M, SFP2);
OCELOT_P(13, UART2, TWI_SCL_M, SFP3);
OCELOT_P(14, MIIM1, TWI_SCL_M, SFP4);
OCELOT_P(15, MIIM1, TWI_SCL_M, SFP5);
OCELOT_P(16, TWI, NONE, SI);
OCELOT_P(17, TWI, TWI_SCL_M, SI);
OCELOT_P(18, PTP0, TWI_SCL_M, NONE);
OCELOT_P(19, PTP1, TWI_SCL_M, NONE);
OCELOT_P(20, RECO_CLK0, TACHO, NONE);
OCELOT_P(21, RECO_CLK1, PWM, NONE);
#define OCELOT_PIN(n) { \
.number = n, \
.name = "GPIO_"#n, \
.drv_data = &ocelot_pin_##n \
}
static const struct pinctrl_pin_desc ocelot_pins[] = {
OCELOT_PIN(0),
OCELOT_PIN(1),
OCELOT_PIN(2),
OCELOT_PIN(3),
OCELOT_PIN(4),
OCELOT_PIN(5),
OCELOT_PIN(6),
OCELOT_PIN(7),
OCELOT_PIN(8),
OCELOT_PIN(9),
OCELOT_PIN(10),
OCELOT_PIN(11),
OCELOT_PIN(12),
OCELOT_PIN(13),
OCELOT_PIN(14),
OCELOT_PIN(15),
OCELOT_PIN(16),
OCELOT_PIN(17),
OCELOT_PIN(18),
OCELOT_PIN(19),
OCELOT_PIN(20),
OCELOT_PIN(21),
};
static int ocelot_get_functions_count(struct pinctrl_dev *pctldev)
{
return ARRAY_SIZE(ocelot_function_names);
}
static const char *ocelot_get_function_name(struct pinctrl_dev *pctldev,
unsigned int function)
{
return ocelot_function_names[function];
}
static int ocelot_get_function_groups(struct pinctrl_dev *pctldev,
unsigned int function,
const char *const **groups,
unsigned *const num_groups)
{
struct ocelot_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
*groups = info->func[function].groups;
*num_groups = info->func[function].ngroups;
return 0;
}
static int ocelot_pin_function_idx(unsigned int pin, unsigned int function)
{
struct ocelot_pin_caps *p = ocelot_pins[pin].drv_data;
int i;
for (i = 0; i < OCELOT_FUNC_PER_PIN; i++) {
if (function == p->functions[i])
return i;
}
return -1;
}
static int ocelot_pinmux_set_mux(struct pinctrl_dev *pctldev,
unsigned int selector, unsigned int group)
{
struct ocelot_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
struct ocelot_pin_caps *pin = ocelot_pins[group].drv_data;
int f;
f = ocelot_pin_function_idx(group, selector);
if (f < 0)
return -EINVAL;
/*
* f is encoded on two bits.
* bit 0 of f goes in BIT(pin) of ALT0, bit 1 of f goes in BIT(pin) of
* ALT1
* This is racy because both registers can't be updated at the same time
* but it doesn't matter much for now.
*/
regmap_update_bits(info->map, OCELOT_GPIO_ALT0, BIT(pin->pin),
f << pin->pin);
regmap_update_bits(info->map, OCELOT_GPIO_ALT1, BIT(pin->pin),
f << (pin->pin - 1));
return 0;
}
static int ocelot_gpio_set_direction(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned int pin, bool input)
{
struct ocelot_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
regmap_update_bits(info->map, OCELOT_GPIO_OE, BIT(pin),
input ? BIT(pin) : 0);
return 0;
}
static int ocelot_gpio_request_enable(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned int offset)
{
struct ocelot_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
regmap_update_bits(info->map, OCELOT_GPIO_ALT0, BIT(offset), 0);
regmap_update_bits(info->map, OCELOT_GPIO_ALT1, BIT(offset), 0);
return 0;
}
static const struct pinmux_ops ocelot_pmx_ops = {
.get_functions_count = ocelot_get_functions_count,
.get_function_name = ocelot_get_function_name,
.get_function_groups = ocelot_get_function_groups,
.set_mux = ocelot_pinmux_set_mux,
.gpio_set_direction = ocelot_gpio_set_direction,
.gpio_request_enable = ocelot_gpio_request_enable,
};
static int ocelot_pctl_get_groups_count(struct pinctrl_dev *pctldev)
{
return ARRAY_SIZE(ocelot_pins);
}
static const char *ocelot_pctl_get_group_name(struct pinctrl_dev *pctldev,
unsigned int group)
{
return ocelot_pins[group].name;
}
static int ocelot_pctl_get_group_pins(struct pinctrl_dev *pctldev,
unsigned int group,
const unsigned int **pins,
unsigned int *num_pins)
{
*pins = &ocelot_pins[group].number;
*num_pins = 1;
return 0;
}
static const struct pinctrl_ops ocelot_pctl_ops = {
.get_groups_count = ocelot_pctl_get_groups_count,
.get_group_name = ocelot_pctl_get_group_name,
.get_group_pins = ocelot_pctl_get_group_pins,
.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
.dt_free_map = pinconf_generic_dt_free_map,
};
static struct pinctrl_desc ocelot_desc = {
.name = "ocelot-pinctrl",
.pins = ocelot_pins,
.npins = ARRAY_SIZE(ocelot_pins),
.pctlops = &ocelot_pctl_ops,
.pmxops = &ocelot_pmx_ops,
.owner = THIS_MODULE,
};
static int ocelot_create_group_func_map(struct device *dev,
struct ocelot_pinctrl *info)
{
u16 pins[ARRAY_SIZE(ocelot_pins)];
int f, npins, i;
for (f = 0; f < FUNC_MAX; f++) {
for (npins = 0, i = 0; i < ARRAY_SIZE(ocelot_pins); i++) {
if (ocelot_pin_function_idx(i, f) >= 0)
pins[npins++] = i;
}
info->func[f].ngroups = npins;
info->func[f].groups = devm_kzalloc(dev, npins *
sizeof(char *),
GFP_KERNEL);
if (!info->func[f].groups)
return -ENOMEM;
for (i = 0; i < npins; i++)
info->func[f].groups[i] = ocelot_pins[pins[i]].name;
}
return 0;
}
static int ocelot_pinctrl_register(struct platform_device *pdev,
struct ocelot_pinctrl *info)
{
int ret;
ret = ocelot_create_group_func_map(&pdev->dev, info);
if (ret) {
dev_err(&pdev->dev, "Unable to create group func map.\n");
return ret;
}
info->pctl = devm_pinctrl_register(&pdev->dev, &ocelot_desc, info);
if (IS_ERR(info->pctl)) {
dev_err(&pdev->dev, "Failed to register pinctrl\n");
return PTR_ERR(info->pctl);
}
return 0;
}
static int ocelot_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
struct ocelot_pinctrl *info = gpiochip_get_data(chip);
unsigned int val;
regmap_read(info->map, OCELOT_GPIO_IN, &val);
return !!(val & BIT(offset));
}
static void ocelot_gpio_set(struct gpio_chip *chip, unsigned int offset,
int value)
{
struct ocelot_pinctrl *info = gpiochip_get_data(chip);
if (value)
regmap_write(info->map, OCELOT_GPIO_OUT_SET, BIT(offset));
else
regmap_write(info->map, OCELOT_GPIO_OUT_CLR, BIT(offset));
}
static int ocelot_gpio_get_direction(struct gpio_chip *chip,
unsigned int offset)
{
struct ocelot_pinctrl *info = gpiochip_get_data(chip);
unsigned int val;
regmap_read(info->map, OCELOT_GPIO_OE, &val);
return !(val & BIT(offset));
}
static int ocelot_gpio_direction_input(struct gpio_chip *chip,
unsigned int offset)
{
return pinctrl_gpio_direction_input(chip->base + offset);
}
static int ocelot_gpio_direction_output(struct gpio_chip *chip,
unsigned int offset, int value)
{
struct ocelot_pinctrl *info = gpiochip_get_data(chip);
unsigned int pin = BIT(offset);
if (value)
regmap_write(info->map, OCELOT_GPIO_OUT_SET, pin);
else
regmap_write(info->map, OCELOT_GPIO_OUT_CLR, pin);
return pinctrl_gpio_direction_output(chip->base + offset);
}
static const struct gpio_chip ocelot_gpiolib_chip = {
.request = gpiochip_generic_request,
.free = gpiochip_generic_free,
.set = ocelot_gpio_set,
.get = ocelot_gpio_get,
.get_direction = ocelot_gpio_get_direction,
.direction_input = ocelot_gpio_direction_input,
.direction_output = ocelot_gpio_direction_output,
.owner = THIS_MODULE,
};
static int ocelot_gpiochip_register(struct platform_device *pdev,
struct ocelot_pinctrl *info)
{
struct gpio_chip *gc;
int ret;
info->gpio_chip = ocelot_gpiolib_chip;
gc = &info->gpio_chip;
gc->ngpio = OCELOT_PINS;
gc->parent = &pdev->dev;
gc->base = 0;
gc->of_node = info->dev->of_node;
gc->label = "ocelot-gpio";
ret = devm_gpiochip_add_data(&pdev->dev, gc, info);
if (ret)
return ret;
/* TODO: this can be used as an irqchip but no board is using that */
return 0;
}
static const struct regmap_config ocelot_pinctrl_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.max_register = 0x64,
};
static const struct of_device_id ocelot_pinctrl_of_match[] = {
{ .compatible = "mscc,ocelot-pinctrl" },
{},
};
int ocelot_pinctrl_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct ocelot_pinctrl *info;
void __iomem *base;
int ret;
info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
base = devm_ioremap_resource(dev,
platform_get_resource(pdev, IORESOURCE_MEM, 0));
if (IS_ERR(base)) {
dev_err(dev, "Failed to ioremap registers\n");
return PTR_ERR(base);
}
info->map = devm_regmap_init_mmio(dev, base,
&ocelot_pinctrl_regmap_config);
if (IS_ERR(info->map)) {
dev_err(dev, "Failed to create regmap\n");
return PTR_ERR(info->map);
}
dev_set_drvdata(dev, info->map);
info->dev = dev;
ret = ocelot_pinctrl_register(pdev, info);
if (ret)
return ret;
ret = ocelot_gpiochip_register(pdev, info);
if (ret)
return ret;
return 0;
}
static struct platform_driver ocelot_pinctrl_driver = {
.driver = {
.name = "pinctrl-ocelot",
.of_match_table = of_match_ptr(ocelot_pinctrl_of_match),
.suppress_bind_attrs = true,
},
.probe = ocelot_pinctrl_probe,
};
builtin_platform_driver(ocelot_pinctrl_driver);
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