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/*
* Copyright (c) 2012 The Chromium OS Authors.
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <fdtdec.h>
#include <pch.h>
#include <pci.h>
#include <asm/cpu.h>
#include <asm/gpio.h>
#include <asm/io.h>
#include <asm/pci.h>
#include <asm/arch/gpio.h>
#include <dt-bindings/gpio/x86-gpio.h>
DECLARE_GLOBAL_DATA_PTR;
/**
* struct broadwell_bank_priv - Private driver data
*
* @regs: Pointer to GPIO registers
* @bank: Bank number for this bank (0, 1 or 2)
* @offset: GPIO offset for this bank (0, 32 or 64)
*/
struct broadwell_bank_priv {
struct pch_lp_gpio_regs *regs;
int bank;
int offset;
};
static int broadwell_gpio_request(struct udevice *dev, unsigned offset,
const char *label)
{
struct broadwell_bank_priv *priv = dev_get_priv(dev);
struct pch_lp_gpio_regs *regs = priv->regs;
u32 val;
/*
* Make sure that the GPIO pin we want isn't already in use for some
* built-in hardware function. We have to check this for every
* requested pin.
*/
debug("%s: request bank %d offset %d: ", __func__, priv->bank, offset);
val = inl(®s->own[priv->bank]);
if (!(val & (1UL << offset))) {
debug("gpio is reserved for internal use\n");
return -EPERM;
}
debug("ok\n");
return 0;
}
static int broadwell_gpio_direction_input(struct udevice *dev, unsigned offset)
{
struct broadwell_bank_priv *priv = dev_get_priv(dev);
struct pch_lp_gpio_regs *regs = priv->regs;
setio_32(®s->config[priv->offset + offset], CONFA_DIR_INPUT);
return 0;
}
static int broadwell_gpio_get_value(struct udevice *dev, unsigned offset)
{
struct broadwell_bank_priv *priv = dev_get_priv(dev);
struct pch_lp_gpio_regs *regs = priv->regs;
return inl(®s->config[priv->offset + offset]) & CONFA_LEVEL_HIGH ?
1 : 0;
}
static int broadwell_gpio_set_value(struct udevice *dev, unsigned offset,
int value)
{
struct broadwell_bank_priv *priv = dev_get_priv(dev);
struct pch_lp_gpio_regs *regs = priv->regs;
debug("%s: dev=%s, offset=%d, value=%d\n", __func__, dev->name, offset,
value);
clrsetio_32(®s->config[priv->offset + offset], CONFA_OUTPUT_HIGH,
value ? CONFA_OUTPUT_HIGH : 0);
return 0;
}
static int broadwell_gpio_direction_output(struct udevice *dev, unsigned offset,
int value)
{
struct broadwell_bank_priv *priv = dev_get_priv(dev);
struct pch_lp_gpio_regs *regs = priv->regs;
broadwell_gpio_set_value(dev, offset, value);
clrio_32(®s->config[priv->offset + offset], CONFA_DIR_INPUT);
return 0;
}
static int broadwell_gpio_get_function(struct udevice *dev, unsigned offset)
{
struct broadwell_bank_priv *priv = dev_get_priv(dev);
struct pch_lp_gpio_regs *regs = priv->regs;
u32 mask = 1UL << offset;
if (!(inl(®s->own[priv->bank]) & mask))
return GPIOF_FUNC;
if (inl(®s->config[priv->offset + offset]) & CONFA_DIR_INPUT)
return GPIOF_INPUT;
else
return GPIOF_OUTPUT;
}
static int broadwell_gpio_probe(struct udevice *dev)
{
struct broadwell_bank_platdata *plat = dev_get_platdata(dev);
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
struct broadwell_bank_priv *priv = dev_get_priv(dev);
uc_priv->gpio_count = GPIO_PER_BANK;
uc_priv->bank_name = plat->bank_name;
priv->regs = (struct pch_lp_gpio_regs *)(uintptr_t)plat->base_addr;
priv->bank = plat->bank;
priv->offset = priv->bank * 32;
debug("%s: probe done, regs %p, bank %d\n", __func__, priv->regs,
priv->bank);
return 0;
}
static int broadwell_gpio_ofdata_to_platdata(struct udevice *dev)
{
struct broadwell_bank_platdata *plat = dev_get_platdata(dev);
u32 gpiobase;
int bank;
int ret;
ret = pch_get_gpio_base(dev->parent, &gpiobase);
if (ret)
return ret;
bank = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "reg", -1);
if (bank == -1) {
debug("%s: Invalid bank number %d\n", __func__, bank);
return -EINVAL;
}
plat->bank = bank;
plat->base_addr = gpiobase;
plat->bank_name = fdt_getprop(gd->fdt_blob, dev->of_offset,
"bank-name", NULL);
return 0;
}
static const struct dm_gpio_ops gpio_broadwell_ops = {
.request = broadwell_gpio_request,
.direction_input = broadwell_gpio_direction_input,
.direction_output = broadwell_gpio_direction_output,
.get_value = broadwell_gpio_get_value,
.set_value = broadwell_gpio_set_value,
.get_function = broadwell_gpio_get_function,
};
static const struct udevice_id intel_broadwell_gpio_ids[] = {
{ .compatible = "intel,broadwell-gpio" },
{ }
};
U_BOOT_DRIVER(gpio_broadwell) = {
.name = "gpio_broadwell",
.id = UCLASS_GPIO,
.of_match = intel_broadwell_gpio_ids,
.ops = &gpio_broadwell_ops,
.ofdata_to_platdata = broadwell_gpio_ofdata_to_platdata,
.probe = broadwell_gpio_probe,
.priv_auto_alloc_size = sizeof(struct broadwell_bank_priv),
.platdata_auto_alloc_size = sizeof(struct broadwell_bank_platdata),
};