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>
#define DRV_NAME "gpio_creg"
struct hsdk_creg_gpio {
u32 *regs;
u8 shift;
u8 activate;
u8 deactivate;
u8 bit_per_gpio;
};
static int hsdk_creg_gpio_set_value(struct udevice *dev, unsigned oft, int val)
{
struct hsdk_creg_gpio *hcg = dev_get_priv(dev);
u8 reg_shift = oft * hcg->bit_per_gpio + hcg->shift;
u32 reg = readl(hcg->regs);
reg &= ~(GENMASK(hcg->bit_per_gpio - 1, 0) << reg_shift);
reg |= ((val ? hcg->deactivate : hcg->activate) << reg_shift);
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)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
pr_err("%s can't be used as input!\n", uc_priv->bank_name);
return -ENOTSUPP;
}
static int hsdk_creg_gpio_get_value(struct udevice *dev, unsigned int oft)
{
struct hsdk_creg_gpio *hcg = dev_get_priv(dev);
u32 val = readl(hcg->regs);
val >>= oft * hcg->bit_per_gpio + hcg->shift;
val &= GENMASK(hcg->bit_per_gpio - 1, 0);
return (val == hcg->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);
u32 shift, bit_per_gpio, activate, deactivate, gpio_count;
const u8 *defaults;
hcg->regs = (u32 *)devfdt_get_addr_ptr(dev);
gpio_count = dev_read_u32_default(dev, "gpio-count", 1);
shift = dev_read_u32_default(dev, "gpio-first-shift", 0);
bit_per_gpio = dev_read_u32_default(dev, "gpio-bit-per-line", 1);
activate = dev_read_u32_default(dev, "gpio-activate-val", 1);
deactivate = dev_read_u32_default(dev, "gpio-deactivate-val", 0);
defaults = dev_read_u8_array_ptr(dev, "gpio-default-val", gpio_count);
uc_priv->bank_name = dev_read_string(dev, "gpio-bank-name");
if (!uc_priv->bank_name)
uc_priv->bank_name = dev_read_name(dev);
if (!bit_per_gpio) {
pr_err("%s: 'gpio-bit-per-line' can't be 0\n",
uc_priv->bank_name);
return -EINVAL;
}
if (!gpio_count) {
pr_err("%s: 'gpio-count' can't be 0\n",
uc_priv->bank_name);
return -EINVAL;
}
if ((gpio_count * bit_per_gpio + shift) > 32) {
pr_err("%s: u32 io register overflow: try to use %u bits\n",
uc_priv->bank_name, gpio_count * bit_per_gpio + shift);
return -EINVAL;
}
if (GENMASK(31, bit_per_gpio) & activate) {
pr_err("%s: 'gpio-activate-val' can't be more than %lu\n",
uc_priv->bank_name, GENMASK(bit_per_gpio - 1, 0));
return -EINVAL;
}
if (GENMASK(31, bit_per_gpio) & deactivate) {
pr_err("%s: 'gpio-deactivate-val' can't be more than %lu\n",
uc_priv->bank_name, GENMASK(bit_per_gpio - 1, 0));
return -EINVAL;
}
if (activate == deactivate) {
pr_err("%s: 'gpio-deactivate-val' and 'gpio-activate-val' can't be equal\n",
uc_priv->bank_name);
return -EINVAL;
}
hcg->shift = (u8)shift;
hcg->bit_per_gpio = (u8)bit_per_gpio;
hcg->activate = (u8)activate;
hcg->deactivate = (u8)deactivate;
uc_priv->gpio_count = gpio_count;
/* Setup default GPIO value if we have "gpio-default-val" array */
if (defaults)
for (u8 i = 0; i < gpio_count; i++)
hsdk_creg_gpio_set_value(dev, i, defaults[i]);
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,creg-gpio" },
{ }
};
U_BOOT_DRIVER(gpio_hsdk_creg) = {
.name = DRV_NAME,
.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),
};