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alistair23-linux/drivers/pinctrl/pinctrl-ocelot.c
Quentin Schulz be36abb71d pinctrl: ocelot: add support for interrupt controller 
This GPIO controller can serve as an interrupt controller as well on the
GPIOs it handles.

An interrupt is generated whenever a GPIO line changes and the
interrupt for this GPIO line is enabled. This means that both the
changes from low to high and high to low generate an interrupt.

For some use cases, it makes sense to ignore the high to low change and
not generate an interrupt. Such a use case is a line that is hold in a
level high/low manner until the event holding the line gets acked.
This can be achieved by making sure the interrupt on the GPIO controller
side gets acked and masked only after the line gets hold in its default
state, this is what's done with the fasteoi functions.

Only IRQ_TYPE_EDGE_BOTH and IRQ_TYPE_LEVEL_HIGH are supported for now.

Signed-off-by: Quentin Schulz <quentin.schulz@bootlin.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2018-08-06 13:00:17 +02:00

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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_irq.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_SCL_M);
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 ? 0 : BIT(pin));
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_kcalloc(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 void ocelot_irq_mask(struct irq_data *data)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
struct ocelot_pinctrl *info = gpiochip_get_data(chip);
unsigned int gpio = irqd_to_hwirq(data);
regmap_update_bits(info->map, OCELOT_GPIO_INTR_ENA, BIT(gpio), 0);
}
static void ocelot_irq_unmask(struct irq_data *data)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
struct ocelot_pinctrl *info = gpiochip_get_data(chip);
unsigned int gpio = irqd_to_hwirq(data);
regmap_update_bits(info->map, OCELOT_GPIO_INTR_ENA, BIT(gpio),
BIT(gpio));
}
static void ocelot_irq_ack(struct irq_data *data)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
struct ocelot_pinctrl *info = gpiochip_get_data(chip);
unsigned int gpio = irqd_to_hwirq(data);
regmap_write_bits(info->map, OCELOT_GPIO_INTR, BIT(gpio), BIT(gpio));
}
static int ocelot_irq_set_type(struct irq_data *data, unsigned int type);
static struct irq_chip ocelot_eoi_irqchip = {
.name = "gpio",
.irq_mask = ocelot_irq_mask,
.irq_eoi = ocelot_irq_ack,
.irq_unmask = ocelot_irq_unmask,
.flags = IRQCHIP_EOI_THREADED | IRQCHIP_EOI_IF_HANDLED,
.irq_set_type = ocelot_irq_set_type,
};
static struct irq_chip ocelot_irqchip = {
.name = "gpio",
.irq_mask = ocelot_irq_mask,
.irq_ack = ocelot_irq_ack,
.irq_unmask = ocelot_irq_unmask,
.irq_set_type = ocelot_irq_set_type,
};
static int ocelot_irq_set_type(struct irq_data *data, unsigned int type)
{
type &= IRQ_TYPE_SENSE_MASK;
if (!(type & (IRQ_TYPE_EDGE_BOTH | IRQ_TYPE_LEVEL_HIGH)))
return -EINVAL;
if (type & IRQ_TYPE_LEVEL_HIGH)
irq_set_chip_handler_name_locked(data, &ocelot_eoi_irqchip,
handle_fasteoi_irq, NULL);
if (type & IRQ_TYPE_EDGE_BOTH)
irq_set_chip_handler_name_locked(data, &ocelot_irqchip,
handle_edge_irq, NULL);
return 0;
}
static void ocelot_irq_handler(struct irq_desc *desc)
{
struct irq_chip *parent_chip = irq_desc_get_chip(desc);
struct gpio_chip *chip = irq_desc_get_handler_data(desc);
struct ocelot_pinctrl *info = gpiochip_get_data(chip);
unsigned int reg = 0, irq;
unsigned long irqs;
regmap_read(info->map, OCELOT_GPIO_INTR_IDENT, &reg);
if (!reg)
return;
chained_irq_enter(parent_chip, desc);
irqs = reg;
for_each_set_bit(irq, &irqs, OCELOT_PINS) {
generic_handle_irq(irq_linear_revmap(chip->irq.domain, irq));
}
chained_irq_exit(parent_chip, desc);
}
static int ocelot_gpiochip_register(struct platform_device *pdev,
struct ocelot_pinctrl *info)
{
struct gpio_chip *gc;
int ret, irq;
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;
irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
if (irq <= 0)
return irq;
ret = gpiochip_irqchip_add(gc, &ocelot_irqchip, 0, handle_edge_irq,
IRQ_TYPE_NONE);
if (ret)
return ret;
gpiochip_set_chained_irqchip(gc, &ocelot_irqchip, irq,
ocelot_irq_handler);
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" },
{},
};
static 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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