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linux-sg2042/drivers/pinctrl/pinctrl-rza2.c

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// SPDX-License-Identifier: GPL-2.0
/*
* Combined GPIO and pin controller support for Renesas RZ/A2 (R7S9210) SoC
*
* Copyright (C) 2018 Chris Brandt
*/
/*
* This pin controller/gpio combined driver supports Renesas devices of RZ/A2
* family.
*/
#include <linux/bitops.h>
#include <linux/gpio.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/pinctrl/pinmux.h>
#include "core.h"
#include "pinmux.h"
#define DRIVER_NAME "pinctrl-rza2"
#define RZA2_PINS_PER_PORT 8
#define RZA2_PIN_ID_TO_PORT(id) ((id) / RZA2_PINS_PER_PORT)
#define RZA2_PIN_ID_TO_PIN(id) ((id) % RZA2_PINS_PER_PORT)
/*
* Use 16 lower bits [15:0] for pin identifier
* Use 16 higher bits [31:16] for pin mux function
*/
#define MUX_PIN_ID_MASK GENMASK(15, 0)
#define MUX_FUNC_MASK GENMASK(31, 16)
#define MUX_FUNC_OFFS 16
#define MUX_FUNC(pinconf) ((pinconf & MUX_FUNC_MASK) >> MUX_FUNC_OFFS)
static const char port_names[] = "0123456789ABCDEFGHJKLM";
struct rza2_pinctrl_priv {
struct device *dev;
void __iomem *base;
struct pinctrl_pin_desc *pins;
struct pinctrl_desc desc;
struct pinctrl_dev *pctl;
struct pinctrl_gpio_range gpio_range;
int npins;
};
#define RZA2_PDR(port) (0x0000 + (port) * 2) /* Direction 16-bit */
#define RZA2_PODR(port) (0x0040 + (port)) /* Output Data 8-bit */
#define RZA2_PIDR(port) (0x0060 + (port)) /* Input Data 8-bit */
#define RZA2_PMR(port) (0x0080 + (port)) /* Mode 8-bit */
#define RZA2_DSCR(port) (0x0140 + (port) * 2) /* Drive 16-bit */
#define RZA2_PFS(port, pin) (0x0200 + ((port) * 8) + (pin)) /* Fnct 8-bit */
#define RZA2_PWPR 0x02ff /* Write Protect 8-bit */
#define RZA2_PFENET 0x0820 /* Ethernet Pins 8-bit */
#define RZA2_PPOC 0x0900 /* Dedicated Pins 32-bit */
#define RZA2_PHMOMO 0x0980 /* Peripheral Pins 32-bit */
#define RZA2_PCKIO 0x09d0 /* CKIO Drive 8-bit */
#define RZA2_PDR_INPUT 0x02
#define RZA2_PDR_OUTPUT 0x03
#define RZA2_PDR_MASK 0x03
#define PWPR_B0WI BIT(7) /* Bit Write Disable */
#define PWPR_PFSWE BIT(6) /* PFS Register Write Enable */
#define PFS_ISEL BIT(6) /* Interrupt Select */
static void rza2_set_pin_function(void __iomem *pfc_base, u8 port, u8 pin,
u8 func)
{
u16 mask16;
u16 reg16;
u8 reg8;
/* Set pin to 'Non-use (Hi-z input protection)' */
reg16 = readw(pfc_base + RZA2_PDR(port));
mask16 = RZA2_PDR_MASK << (pin * 2);
reg16 &= ~mask16;
writew(reg16, pfc_base + RZA2_PDR(port));
/* Temporarily switch to GPIO */
reg8 = readb(pfc_base + RZA2_PMR(port));
reg8 &= ~BIT(pin);
writeb(reg8, pfc_base + RZA2_PMR(port));
/* PFS Register Write Protect : OFF */
writeb(0x00, pfc_base + RZA2_PWPR); /* B0WI=0, PFSWE=0 */
writeb(PWPR_PFSWE, pfc_base + RZA2_PWPR); /* B0WI=0, PFSWE=1 */
/* Set Pin function (interrupt disabled, ISEL=0) */
writeb(func, pfc_base + RZA2_PFS(port, pin));
/* PFS Register Write Protect : ON */
writeb(0x00, pfc_base + RZA2_PWPR); /* B0WI=0, PFSWE=0 */
writeb(0x80, pfc_base + RZA2_PWPR); /* B0WI=1, PFSWE=0 */
/* Port Mode : Peripheral module pin functions */
reg8 = readb(pfc_base + RZA2_PMR(port));
reg8 |= BIT(pin);
writeb(reg8, pfc_base + RZA2_PMR(port));
}
static void rza2_pin_to_gpio(void __iomem *pfc_base, unsigned int offset,
u8 dir)
{
u8 port = RZA2_PIN_ID_TO_PORT(offset);
u8 pin = RZA2_PIN_ID_TO_PIN(offset);
u16 mask16;
u16 reg16;
reg16 = readw(pfc_base + RZA2_PDR(port));
mask16 = RZA2_PDR_MASK << (pin * 2);
reg16 &= ~mask16;
if (dir == GPIOF_DIR_IN)
reg16 |= RZA2_PDR_INPUT << (pin * 2); /* pin as input */
else
reg16 |= RZA2_PDR_OUTPUT << (pin * 2); /* pin as output */
writew(reg16, pfc_base + RZA2_PDR(port));
}
static int rza2_chip_get_direction(struct gpio_chip *chip, unsigned int offset)
{
struct rza2_pinctrl_priv *priv = gpiochip_get_data(chip);
u8 port = RZA2_PIN_ID_TO_PORT(offset);
u8 pin = RZA2_PIN_ID_TO_PIN(offset);
u16 reg16;
reg16 = readw(priv->base + RZA2_PDR(port));
reg16 = (reg16 >> (pin * 2)) & RZA2_PDR_MASK;
if (reg16 == RZA2_PDR_OUTPUT)
return GPIOF_DIR_OUT;
if (reg16 == RZA2_PDR_INPUT)
return GPIOF_DIR_IN;
/*
* This GPIO controller has a default Hi-Z state that is not input or
* output, so force the pin to input now.
*/
rza2_pin_to_gpio(priv->base, offset, GPIOF_DIR_IN);
return GPIOF_DIR_IN;
}
static int rza2_chip_direction_input(struct gpio_chip *chip,
unsigned int offset)
{
struct rza2_pinctrl_priv *priv = gpiochip_get_data(chip);
rza2_pin_to_gpio(priv->base, offset, GPIOF_DIR_IN);
return 0;
}
static int rza2_chip_get(struct gpio_chip *chip, unsigned int offset)
{
struct rza2_pinctrl_priv *priv = gpiochip_get_data(chip);
u8 port = RZA2_PIN_ID_TO_PORT(offset);
u8 pin = RZA2_PIN_ID_TO_PIN(offset);
return !!(readb(priv->base + RZA2_PIDR(port)) & BIT(pin));
}
static void rza2_chip_set(struct gpio_chip *chip, unsigned int offset,
int value)
{
struct rza2_pinctrl_priv *priv = gpiochip_get_data(chip);
u8 port = RZA2_PIN_ID_TO_PORT(offset);
u8 pin = RZA2_PIN_ID_TO_PIN(offset);
u8 new_value;
new_value = readb(priv->base + RZA2_PODR(port));
if (value)
new_value |= BIT(pin);
else
new_value &= ~BIT(pin);
writeb(new_value, priv->base + RZA2_PODR(port));
}
static int rza2_chip_direction_output(struct gpio_chip *chip,
unsigned int offset, int val)
{
struct rza2_pinctrl_priv *priv = gpiochip_get_data(chip);
rza2_chip_set(chip, offset, val);
rza2_pin_to_gpio(priv->base, offset, GPIOF_DIR_OUT);
return 0;
}
static const char * const rza2_gpio_names[] = {
"P0_0", "P0_1", "P0_2", "P0_3", "P0_4", "P0_5", "P0_6", "P0_7",
"P1_0", "P1_1", "P1_2", "P1_3", "P1_4", "P1_5", "P1_6", "P1_7",
"P2_0", "P2_1", "P2_2", "P2_3", "P2_4", "P2_5", "P2_6", "P2_7",
"P3_0", "P3_1", "P3_2", "P3_3", "P3_4", "P3_5", "P3_6", "P3_7",
"P4_0", "P4_1", "P4_2", "P4_3", "P4_4", "P4_5", "P4_6", "P4_7",
"P5_0", "P5_1", "P5_2", "P5_3", "P5_4", "P5_5", "P5_6", "P5_7",
"P6_0", "P6_1", "P6_2", "P6_3", "P6_4", "P6_5", "P6_6", "P6_7",
"P7_0", "P7_1", "P7_2", "P7_3", "P7_4", "P7_5", "P7_6", "P7_7",
"P8_0", "P8_1", "P8_2", "P8_3", "P8_4", "P8_5", "P8_6", "P8_7",
"P9_0", "P9_1", "P9_2", "P9_3", "P9_4", "P9_5", "P9_6", "P9_7",
"PA_0", "PA_1", "PA_2", "PA_3", "PA_4", "PA_5", "PA_6", "PA_7",
"PB_0", "PB_1", "PB_2", "PB_3", "PB_4", "PB_5", "PB_6", "PB_7",
"PC_0", "PC_1", "PC_2", "PC_3", "PC_4", "PC_5", "PC_6", "PC_7",
"PD_0", "PD_1", "PD_2", "PD_3", "PD_4", "PD_5", "PD_6", "PD_7",
"PE_0", "PE_1", "PE_2", "PE_3", "PE_4", "PE_5", "PE_6", "PE_7",
"PF_0", "PF_1", "PF_2", "PF_3", "P0_4", "PF_5", "PF_6", "PF_7",
"PG_0", "PG_1", "PG_2", "P0_3", "PG_4", "PG_5", "PG_6", "PG_7",
"PH_0", "PH_1", "PH_2", "PH_3", "PH_4", "PH_5", "PH_6", "PH_7",
/* port I does not exist */
"PJ_0", "PJ_1", "PJ_2", "PJ_3", "PJ_4", "PJ_5", "PJ_6", "PJ_7",
"PK_0", "PK_1", "PK_2", "PK_3", "PK_4", "PK_5", "PK_6", "PK_7",
"PL_0", "PL_1", "PL_2", "PL_3", "PL_4", "PL_5", "PL_6", "PL_7",
"PM_0", "PM_1", "PM_2", "PM_3", "PM_4", "PM_5", "PM_6", "PM_7",
};
static struct gpio_chip chip = {
.names = rza2_gpio_names,
.base = -1,
.get_direction = rza2_chip_get_direction,
.direction_input = rza2_chip_direction_input,
.direction_output = rza2_chip_direction_output,
.get = rza2_chip_get,
.set = rza2_chip_set,
};
static int rza2_gpio_register(struct rza2_pinctrl_priv *priv)
{
struct device_node *np = priv->dev->of_node;
struct of_phandle_args of_args;
int ret;
chip.label = devm_kasprintf(priv->dev, GFP_KERNEL, "%pOFn", np);
chip.of_node = np;
chip.parent = priv->dev;
chip.ngpio = priv->npins;
ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, 0,
&of_args);
if (ret) {
dev_err(priv->dev, "Unable to parse gpio-ranges\n");
return ret;
}
if ((of_args.args[0] != 0) ||
(of_args.args[1] != 0) ||
(of_args.args[2] != priv->npins)) {
dev_err(priv->dev, "gpio-ranges does not match selected SOC\n");
return -EINVAL;
}
priv->gpio_range.id = 0;
priv->gpio_range.pin_base = priv->gpio_range.base = 0;
priv->gpio_range.npins = priv->npins;
priv->gpio_range.name = chip.label;
priv->gpio_range.gc = &chip;
/* Register our gpio chip with gpiolib */
ret = devm_gpiochip_add_data(priv->dev, &chip, priv);
if (ret)
return ret;
/* Register pin range with pinctrl core */
pinctrl_add_gpio_range(priv->pctl, &priv->gpio_range);
dev_dbg(priv->dev, "Registered gpio controller\n");
return 0;
}
static int rza2_pinctrl_register(struct rza2_pinctrl_priv *priv)
{
struct pinctrl_pin_desc *pins;
unsigned int i;
int ret;
pins = devm_kcalloc(priv->dev, priv->npins, sizeof(*pins), GFP_KERNEL);
if (!pins)
return -ENOMEM;
priv->pins = pins;
priv->desc.pins = pins;
priv->desc.npins = priv->npins;
for (i = 0; i < priv->npins; i++) {
pins[i].number = i;
pins[i].name = rza2_gpio_names[i];
}
ret = devm_pinctrl_register_and_init(priv->dev, &priv->desc, priv,
&priv->pctl);
if (ret) {
dev_err(priv->dev, "pinctrl registration failed\n");
return ret;
}
ret = pinctrl_enable(priv->pctl);
if (ret) {
dev_err(priv->dev, "pinctrl enable failed\n");
return ret;
}
ret = rza2_gpio_register(priv);
if (ret) {
dev_err(priv->dev, "GPIO registration failed\n");
return ret;
}
return 0;
}
/*
* For each DT node, create a single pin mapping. That pin mapping will only
* contain a single group of pins, and that group of pins will only have a
* single function that can be selected.
*/
static int rza2_dt_node_to_map(struct pinctrl_dev *pctldev,
struct device_node *np,
struct pinctrl_map **map,
unsigned int *num_maps)
{
struct rza2_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev);
unsigned int *pins, *psel_val;
int i, ret, npins, gsel, fsel;
struct property *of_pins;
const char **pin_fn;
/* Find out how many pins to map */
of_pins = of_find_property(np, "pinmux", NULL);
if (!of_pins) {
dev_info(priv->dev, "Missing pinmux property\n");
return -ENOENT;
}
npins = of_pins->length / sizeof(u32);
pins = devm_kcalloc(priv->dev, npins, sizeof(*pins), GFP_KERNEL);
psel_val = devm_kcalloc(priv->dev, npins, sizeof(*psel_val),
GFP_KERNEL);
pin_fn = devm_kzalloc(priv->dev, sizeof(*pin_fn), GFP_KERNEL);
if (!pins || !psel_val || !pin_fn)
return -ENOMEM;
/* Collect pin locations and mux settings from DT properties */
for (i = 0; i < npins; ++i) {
u32 value;
ret = of_property_read_u32_index(np, "pinmux", i, &value);
if (ret)
return ret;
pins[i] = value & MUX_PIN_ID_MASK;
psel_val[i] = MUX_FUNC(value);
}
/* Register a single pin group listing all the pins we read from DT */
gsel = pinctrl_generic_add_group(pctldev, np->name, pins, npins, NULL);
if (gsel < 0)
return gsel;
/*
* Register a single group function where the 'data' is an array PSEL
* register values read from DT.
*/
pin_fn[0] = np->name;
fsel = pinmux_generic_add_function(pctldev, np->name, pin_fn, 1,
psel_val);
if (fsel < 0) {
ret = fsel;
goto remove_group;
}
dev_dbg(priv->dev, "Parsed %pOF with %d pins\n", np, npins);
/* Create map where to retrieve function and mux settings from */
*num_maps = 0;
*map = kzalloc(sizeof(**map), GFP_KERNEL);
if (!*map) {
ret = -ENOMEM;
goto remove_function;
}
(*map)->type = PIN_MAP_TYPE_MUX_GROUP;
(*map)->data.mux.group = np->name;
(*map)->data.mux.function = np->name;
*num_maps = 1;
return 0;
remove_function:
pinmux_generic_remove_function(pctldev, fsel);
remove_group:
pinctrl_generic_remove_group(pctldev, gsel);
dev_err(priv->dev, "Unable to parse DT node %s\n", np->name);
return ret;
}
static void rza2_dt_free_map(struct pinctrl_dev *pctldev,
struct pinctrl_map *map, unsigned int num_maps)
{
kfree(map);
}
static const struct pinctrl_ops rza2_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,
.dt_node_to_map = rza2_dt_node_to_map,
.dt_free_map = rza2_dt_free_map,
};
static int rza2_set_mux(struct pinctrl_dev *pctldev, unsigned int selector,
unsigned int group)
{
struct rza2_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev);
struct function_desc *func;
unsigned int i, *psel_val;
struct group_desc *grp;
grp = pinctrl_generic_get_group(pctldev, group);
if (!grp)
return -EINVAL;
func = pinmux_generic_get_function(pctldev, selector);
if (!func)
return -EINVAL;
psel_val = func->data;
for (i = 0; i < grp->num_pins; ++i) {
dev_dbg(priv->dev, "Setting P%c_%d to PSEL=%d\n",
port_names[RZA2_PIN_ID_TO_PORT(grp->pins[i])],
RZA2_PIN_ID_TO_PIN(grp->pins[i]),
psel_val[i]);
rza2_set_pin_function(
priv->base,
RZA2_PIN_ID_TO_PORT(grp->pins[i]),
RZA2_PIN_ID_TO_PIN(grp->pins[i]),
psel_val[i]);
}
return 0;
}
static const struct pinmux_ops rza2_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 = rza2_set_mux,
.strict = true,
};
static int rza2_pinctrl_probe(struct platform_device *pdev)
{
struct rza2_pinctrl_priv *priv;
struct resource *res;
int ret;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->dev = &pdev->dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
priv->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(priv->base))
return PTR_ERR(priv->base);
platform_set_drvdata(pdev, priv);
priv->npins = (int)(uintptr_t)of_device_get_match_data(&pdev->dev) *
RZA2_PINS_PER_PORT;
priv->desc.name = DRIVER_NAME;
priv->desc.pctlops = &rza2_pinctrl_ops;
priv->desc.pmxops = &rza2_pinmux_ops;
priv->desc.owner = THIS_MODULE;
ret = rza2_pinctrl_register(priv);
if (ret)
return ret;
dev_info(&pdev->dev, "Registered ports P0 - P%c\n",
port_names[priv->desc.npins / RZA2_PINS_PER_PORT - 1]);
return 0;
}
static const struct of_device_id rza2_pinctrl_of_match[] = {
{ .compatible = "renesas,r7s9210-pinctrl", .data = (void *)22, },
{ /* sentinel */ }
};
static struct platform_driver rza2_pinctrl_driver = {
.driver = {
.name = DRIVER_NAME,
.of_match_table = rza2_pinctrl_of_match,
},
.probe = rza2_pinctrl_probe,
};
static int __init rza2_pinctrl_init(void)
{
return platform_driver_register(&rza2_pinctrl_driver);
}
core_initcall(rza2_pinctrl_init);
MODULE_AUTHOR("Chris Brandt <chris.brandt@renesas.com>");
MODULE_DESCRIPTION("Pin and gpio controller driver for RZ/A2 SoC");
MODULE_LICENSE("GPL v2");
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