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/*
* Exynos pinctrl driver common code.
* Copyright (C) 2016 Samsung Electronics
* Thomas Abraham <thomas.ab@samsung.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <asm/io.h>
#include "pinctrl-exynos.h"
DECLARE_GLOBAL_DATA_PTR;
/**
* exynos_pinctrl_setup_peri: setup pinctrl for a peripheral.
* conf: soc specific pin configuration data array
* num_conf: number of configurations in the conf array.
* base: base address of the pin controller.
*/
void exynos_pinctrl_setup_peri(struct exynos_pinctrl_config_data *conf,
unsigned int num_conf, unsigned long base)
{
unsigned int idx, val;
for (idx = 0; idx < num_conf; idx++) {
val = readl(base + conf[idx].offset);
val &= ~(conf[idx].mask);
val |= conf[idx].value;
writel(val, base + conf[idx].offset);
}
}
/* given a pin-name, return the address of pin config registers */
static unsigned long pin_to_bank_base(struct udevice *dev, const char *pin_name,
u32 *pin)
{
struct exynos_pinctrl_priv *priv = dev_get_priv(dev);
const struct samsung_pin_ctrl *pin_ctrl = priv->pin_ctrl;
const struct samsung_pin_bank_data *bank_data = pin_ctrl->pin_banks;
u32 nr_banks = pin_ctrl->nr_banks, idx = 0;
char bank[10];
/*
* The format of the pin name is <bank name>-<pin_number>.
* Example: gpa0-4 (gpa0 is the bank name and 4 is the pin number.
*/
while (pin_name[idx] != '-') {
bank[idx] = pin_name[idx];
idx++;
}
bank[idx] = '\0';
*pin = pin_name[++idx] - '0';
/* lookup the pin bank data using the pin bank name */
for (idx = 0; idx < nr_banks; idx++)
if (!strcmp(bank, bank_data[idx].name))
break;
return priv->base + bank_data[idx].offset;
}
/**
* exynos_pinctrl_set_state: configure a pin state.
* dev: the pinctrl device to be configured.
* config: the state to be configured.
*/
int exynos_pinctrl_set_state(struct udevice *dev, struct udevice *config)
{
const void *fdt = gd->fdt_blob;
int node = dev_of_offset(config);
unsigned int count, idx, pin_num;
unsigned int pinfunc, pinpud, pindrv;
unsigned long reg, value;
const char *name;
/*
* refer to the following document for the pinctrl bindings
* linux/Documentation/devicetree/bindings/pinctrl/samsung-pinctrl.txt
*/
count = fdt_stringlist_count(fdt, node, "samsung,pins");
if (count <= 0)
return -EINVAL;
pinfunc = fdtdec_get_int(fdt, node, "samsung,pin-function", -1);
pinpud = fdtdec_get_int(fdt, node, "samsung,pin-pud", -1);
pindrv = fdtdec_get_int(fdt, node, "samsung,pin-drv", -1);
for (idx = 0; idx < count; idx++) {
name = fdt_stringlist_get(fdt, node, "samsung,pins", idx, NULL);
if (!name)
continue;
reg = pin_to_bank_base(dev, name, &pin_num);
if (pinfunc != -1) {
value = readl(reg + PIN_CON);
value &= ~(0xf << (pin_num << 2));
value |= (pinfunc << (pin_num << 2));
writel(value, reg + PIN_CON);
}
if (pinpud != -1) {
value = readl(reg + PIN_PUD);
value &= ~(0x3 << (pin_num << 1));
value |= (pinpud << (pin_num << 1));
writel(value, reg + PIN_PUD);
}
if (pindrv != -1) {
value = readl(reg + PIN_DRV);
value &= ~(0x3 << (pin_num << 1));
value |= (pindrv << (pin_num << 1));
writel(value, reg + PIN_DRV);
}
}
return 0;
}
int exynos_pinctrl_probe(struct udevice *dev)
{
struct exynos_pinctrl_priv *priv;
fdt_addr_t base;
priv = dev_get_priv(dev);
if (!priv)
return -EINVAL;
base = devfdt_get_addr(dev);
if (base == FDT_ADDR_T_NONE)
return -EINVAL;
priv->base = base;
priv->pin_ctrl = (struct samsung_pin_ctrl *)dev_get_driver_data(dev) +
dev->req_seq;
return 0;
}
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