hsdk-creg-gpio.c
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/*
* Synopsys HSDK SDP Generic PLL clock driver
*
* Copyright (C) 2017 Synopsys
* Author: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <asm-generic/gpio.h>
#include <asm/io.h>
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <linux/printk.h>
DECLARE_GLOBAL_DATA_PTR;
#define HSDK_CREG_MAX_GPIO 8
#define GPIO_ACTIVATE 0x2
#define GPIO_DEACTIVATE 0x3
#define GPIO_PIN_MASK 0x3
#define BIT_PER_GPIO 2
struct hsdk_creg_gpio {
uint32_t *regs;
};
static int hsdk_creg_gpio_set_value(struct udevice *dev, unsigned oft, int val)
{
struct hsdk_creg_gpio *hcg = dev_get_priv(dev);
uint32_t reg = readl(hcg->regs);
uint32_t cmd = val ? GPIO_DEACTIVATE : GPIO_ACTIVATE;
reg &= ~(GPIO_PIN_MASK << (oft * BIT_PER_GPIO));
reg |= (cmd << (oft * BIT_PER_GPIO));
writel(reg, hcg->regs);
return 0;
}
static int hsdk_creg_gpio_direction_output(struct udevice *dev, unsigned oft,
int val)
{
hsdk_creg_gpio_set_value(dev, oft, val);
return 0;
}
static int hsdk_creg_gpio_direction_input(struct udevice *dev, unsigned oft)
{
pr_err("hsdk-creg-gpio can't be used as input!\n");
return -ENOTSUPP;
}
static int hsdk_creg_gpio_get_value(struct udevice *dev, unsigned int oft)
{
struct hsdk_creg_gpio *hcg = dev_get_priv(dev);
uint32_t val = readl(hcg->regs);
val = (val >> (oft * BIT_PER_GPIO)) & GPIO_PIN_MASK;
return (val == GPIO_DEACTIVATE) ? 1 : 0;
}
static const struct dm_gpio_ops hsdk_creg_gpio_ops = {
.direction_output = hsdk_creg_gpio_direction_output,
.direction_input = hsdk_creg_gpio_direction_input,
.set_value = hsdk_creg_gpio_set_value,
.get_value = hsdk_creg_gpio_get_value,
};
static int hsdk_creg_gpio_probe(struct udevice *dev)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
struct hsdk_creg_gpio *hcg = dev_get_priv(dev);
hcg->regs = (uint32_t *)devfdt_get_addr_ptr(dev);
uc_priv->gpio_count = dev_read_u32_default(dev, "gpio-count", 1);
if (uc_priv->gpio_count > HSDK_CREG_MAX_GPIO)
uc_priv->gpio_count = HSDK_CREG_MAX_GPIO;
uc_priv->bank_name = dev_read_string(dev, "gpio-bank-name");
if (!uc_priv->bank_name)
uc_priv->bank_name = dev_read_name(dev);
pr_debug("%s GPIO [0x%p] controller with %d gpios probed\n",
uc_priv->bank_name, hcg->regs, uc_priv->gpio_count);
return 0;
}
static const struct udevice_id hsdk_creg_gpio_ids[] = {
{ .compatible = "snps,hsdk-creg-gpio" },
{ }
};
U_BOOT_DRIVER(gpio_hsdk_creg) = {
.name = "gpio_hsdk_creg",
.id = UCLASS_GPIO,
.ops = &hsdk_creg_gpio_ops,
.probe = hsdk_creg_gpio_probe,
.of_match = hsdk_creg_gpio_ids,
.platdata_auto_alloc_size = sizeof(struct hsdk_creg_gpio),
};