pinctrl-at91-pio4.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* Atmel PIO4 pinctrl driver
*
* Copyright (C) 2016 Atmel Corporation
* Wenyou.Yang <wenyou.yang@atmel.com>
*/
#include <common.h>
#include <dm.h>
#include <dm/pinctrl.h>
#include <linux/io.h>
#include <linux/err.h>
#include <mach/atmel_pio4.h>
DECLARE_GLOBAL_DATA_PTR;
/*
* Warning:
* In order to not introduce confusion between Atmel PIO groups and pinctrl
* framework groups, Atmel PIO groups will be called banks.
*/
struct atmel_pio4_platdata {
struct atmel_pio4_port *reg_base;
};
static const struct pinconf_param conf_params[] = {
{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
{ "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
{ "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
{ "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
{ "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
};
static u32 atmel_pinctrl_get_pinconf(const void *blob, int node)
{
const struct pinconf_param *params;
u32 param, arg, conf = 0;
u32 i;
for (i = 0; i < ARRAY_SIZE(conf_params); i++) {
params = &conf_params[i];
if (!fdt_get_property(blob, node, params->property, NULL))
continue;
param = params->param;
arg = params->default_value;
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
conf &= (~ATMEL_PIO_PUEN_MASK);
conf &= (~ATMEL_PIO_PDEN_MASK);
break;
case PIN_CONFIG_BIAS_PULL_UP:
conf |= ATMEL_PIO_PUEN_MASK;
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
conf |= ATMEL_PIO_PDEN_MASK;
break;
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
if (arg == 0)
conf &= (~ATMEL_PIO_OPD_MASK);
else
conf |= ATMEL_PIO_OPD_MASK;
break;
case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
if (arg == 0)
conf |= ATMEL_PIO_SCHMITT_MASK;
else
conf &= (~ATMEL_PIO_SCHMITT_MASK);
break;
case PIN_CONFIG_INPUT_DEBOUNCE:
if (arg == 0) {
conf &= (~ATMEL_PIO_IFEN_MASK);
conf &= (~ATMEL_PIO_IFSCEN_MASK);
} else {
conf |= ATMEL_PIO_IFEN_MASK;
conf |= ATMEL_PIO_IFSCEN_MASK;
}
break;
default:
printf("%s: Unsupported configuration parameter: %u\n",
__func__, param);
break;
}
}
return conf;
}
static inline struct atmel_pio4_port *atmel_pio4_bank_base(struct udevice *dev,
u32 bank)
{
struct atmel_pio4_platdata *plat = dev_get_platdata(dev);
struct atmel_pio4_port *bank_base =
(struct atmel_pio4_port *)((u32)plat->reg_base +
ATMEL_PIO_BANK_OFFSET * bank);
return bank_base;
}
#define MAX_PINMUX_ENTRIES 40
static int atmel_pinctrl_set_state(struct udevice *dev, struct udevice *config)
{
struct atmel_pio4_port *bank_base;
const void *blob = gd->fdt_blob;
int node = dev_of_offset(config);
u32 offset, func, bank, line;
u32 cells[MAX_PINMUX_ENTRIES];
u32 i, conf;
int count;
conf = atmel_pinctrl_get_pinconf(blob, node);
count = fdtdec_get_int_array_count(blob, node, "pinmux",
cells, ARRAY_SIZE(cells));
if (count < 0) {
printf("%s: bad pinmux array %d\n", __func__, count);
return -EINVAL;
}
if (count > MAX_PINMUX_ENTRIES) {
printf("%s: unsupported pinmux array count %d\n",
__func__, count);
return -EINVAL;
}
for (i = 0 ; i < count; i++) {
offset = ATMEL_GET_PIN_NO(cells[i]);
func = ATMEL_GET_PIN_FUNC(cells[i]);
bank = ATMEL_PIO_BANK(offset);
line = ATMEL_PIO_LINE(offset);
bank_base = atmel_pio4_bank_base(dev, bank);
writel(BIT(line), &bank_base->mskr);
conf &= (~ATMEL_PIO_CFGR_FUNC_MASK);
conf |= (func & ATMEL_PIO_CFGR_FUNC_MASK);
writel(conf, &bank_base->cfgr);
}
return 0;
}
const struct pinctrl_ops atmel_pinctrl_ops = {
.set_state = atmel_pinctrl_set_state,
};
static int atmel_pinctrl_probe(struct udevice *dev)
{
struct atmel_pio4_platdata *plat = dev_get_platdata(dev);
fdt_addr_t addr_base;
dev = dev_get_parent(dev);
addr_base = devfdt_get_addr(dev);
if (addr_base == FDT_ADDR_T_NONE)
return -EINVAL;
plat->reg_base = (struct atmel_pio4_port *)addr_base;
return 0;
}
static const struct udevice_id atmel_pinctrl_match[] = {
{ .compatible = "atmel,sama5d2-pinctrl" },
{}
};
U_BOOT_DRIVER(atmel_pinctrl) = {
.name = "pinctrl_atmel_pio4",
.id = UCLASS_PINCTRL,
.of_match = atmel_pinctrl_match,
.probe = atmel_pinctrl_probe,
.platdata_auto_alloc_size = sizeof(struct atmel_pio4_platdata),
.ops = &atmel_pinctrl_ops,
};