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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2018 Marvell International Ltd.
*
* (C) Copyright 2011
* eInfochips Ltd. <www.einfochips.com>
* Written-by: Ajay Bhargav <ajay.bhargav@einfochips.com>
*
* (C) Copyright 2010
* Marvell Semiconductor <www.marvell.com>
*/
#include <dm.h>
#include <pci.h>
#include <pci_ids.h>
#include <asm/gpio.h>
#include <asm/io.h>
#include <linux/bitfield.h>
#include <linux/compat.h>
#include <dt-bindings/gpio/gpio.h>
/* Returns the bit value to write or read based on the offset */
#define GPIO_BIT(x) BIT_ULL((x) & 0x3f)
#define GPIO_RX_DAT 0x00
#define GPIO_TX_SET 0x08
#define GPIO_TX_CLR 0x10
#define GPIO_CONST 0x90 /* OcteonTX only */
/* Offset to register-set for 2nd GPIOs (> 63), OcteonTX only */
#define GPIO1_OFFSET 0x1400
/* GPIO_CONST register bits */
#define GPIO_CONST_GPIOS_MASK GENMASK_ULL(7, 0)
/* GPIO_BIT_CFG register bits */
#define GPIO_BIT_CFG_TX_OE BIT_ULL(0)
#define GPIO_BIT_CFG_PIN_XOR BIT_ULL(1)
#define GPIO_BIT_CFG_INT_EN BIT_ULL(2)
#define GPIO_BIT_CFG_PIN_SEL_MASK GENMASK_ULL(26, 16)
enum {
PROBE_PCI = 0, /* PCI based probing */
PROBE_DT, /* DT based probing */
};
struct octeon_gpio_data {
int probe;
u32 reg_offs;
u32 gpio_bit_cfg_offs;
};
struct octeon_gpio {
void __iomem *base;
const struct octeon_gpio_data *data;
};
/* Returns the offset to the output register based on the offset and value */
static u32 gpio_tx_reg(int offset, int value)
{
u32 ret;
ret = value ? GPIO_TX_SET : GPIO_TX_CLR;
if (offset > 63)
ret += GPIO1_OFFSET;
return ret;
}
/* Returns the offset to the input data register based on the offset */
static u32 gpio_rx_dat_reg(int offset)
{
u32 ret;
ret = GPIO_RX_DAT;
if (offset > 63)
ret += GPIO1_OFFSET;
return ret;
}
static int octeon_gpio_dir_input(struct udevice *dev, unsigned int offset)
{
struct octeon_gpio *gpio = dev_get_priv(dev);
debug("%s(%s, %u)\n", __func__, dev->name, offset);
clrbits_64(gpio->base + gpio->data->gpio_bit_cfg_offs + 8 * offset,
GPIO_BIT_CFG_TX_OE | GPIO_BIT_CFG_PIN_XOR |
GPIO_BIT_CFG_INT_EN | GPIO_BIT_CFG_PIN_SEL_MASK);
return 0;
}
static int octeon_gpio_dir_output(struct udevice *dev, unsigned int offset,
int value)
{
struct octeon_gpio *gpio = dev_get_priv(dev);
debug("%s(%s, %u, %d)\n", __func__, dev->name, offset, value);
writeq(GPIO_BIT(offset), gpio->base + gpio->data->reg_offs +
gpio_tx_reg(offset, value));
clrsetbits_64(gpio->base + gpio->data->gpio_bit_cfg_offs + 8 * offset,
GPIO_BIT_CFG_PIN_SEL_MASK | GPIO_BIT_CFG_INT_EN,
GPIO_BIT_CFG_TX_OE);
return 0;
}
static int octeon_gpio_get_value(struct udevice *dev, unsigned int offset)
{
struct octeon_gpio *gpio = dev_get_priv(dev);
u64 reg = readq(gpio->base + gpio->data->reg_offs +
gpio_rx_dat_reg(offset));
debug("%s(%s, %u): value: %d\n", __func__, dev->name, offset,
!!(reg & GPIO_BIT(offset)));
return !!(reg & GPIO_BIT(offset));
}
static int octeon_gpio_set_value(struct udevice *dev,
unsigned int offset, int value)
{
struct octeon_gpio *gpio = dev_get_priv(dev);
debug("%s(%s, %u, %d)\n", __func__, dev->name, offset, value);
writeq(GPIO_BIT(offset), gpio->base + gpio->data->reg_offs +
gpio_tx_reg(offset, value));
return 0;
}
static int octeon_gpio_get_function(struct udevice *dev, unsigned int offset)
{
struct octeon_gpio *gpio = dev_get_priv(dev);
u64 val = readq(gpio->base + gpio->data->gpio_bit_cfg_offs +
8 * offset);
int pin_sel;
debug("%s(%s, %u): GPIO_BIT_CFG: 0x%llx\n", __func__, dev->name,
offset, val);
pin_sel = FIELD_GET(GPIO_BIT_CFG_PIN_SEL_MASK, val);
if (pin_sel)
return GPIOF_FUNC;
else if (val & GPIO_BIT_CFG_TX_OE)
return GPIOF_OUTPUT;
else
return GPIOF_INPUT;
}
static int octeon_gpio_xlate(struct udevice *dev, struct gpio_desc *desc,
struct ofnode_phandle_args *args)
{
if (args->args_count < 1)
return -EINVAL;
desc->offset = args->args[0];
desc->flags = 0;
if (args->args_count > 1) {
if (args->args[1] & GPIO_ACTIVE_LOW)
desc->flags |= GPIOD_ACTIVE_LOW;
/* In the future add tri-state flag support */
}
return 0;
}
static const struct dm_gpio_ops octeon_gpio_ops = {
.direction_input = octeon_gpio_dir_input,
.direction_output = octeon_gpio_dir_output,
.get_value = octeon_gpio_get_value,
.set_value = octeon_gpio_set_value,
.get_function = octeon_gpio_get_function,
.xlate = octeon_gpio_xlate,
};
static int octeon_gpio_probe(struct udevice *dev)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
struct octeon_gpio *priv = dev_get_priv(dev);
char *end;
priv->data = (const struct octeon_gpio_data *)dev_get_driver_data(dev);
if (priv->data->probe == PROBE_PCI) {
priv->base = dm_pci_map_bar(dev, PCI_BASE_ADDRESS_0,
PCI_REGION_MEM);
uc_priv->gpio_count = readq(priv->base +
priv->data->reg_offs + GPIO_CONST) &
GPIO_CONST_GPIOS_MASK;
} else {
priv->base = dev_remap_addr(dev);
uc_priv->gpio_count = ofnode_read_u32_default(dev->node,
"nr-gpios", 32);
}
if (!priv->base) {
debug("%s(%s): Could not get base address\n",
__func__, dev->name);
return -ENODEV;
}
uc_priv->bank_name = strdup(dev->name);
end = strchr(uc_priv->bank_name, '@');
end[0] = 'A' + dev_seq(dev);
end[1] = '\0';
debug("%s(%s): base address: %p, pin count: %d\n",
__func__, dev->name, priv->base, uc_priv->gpio_count);
return 0;
}
static const struct octeon_gpio_data gpio_octeon_data = {
.probe = PROBE_DT,
.reg_offs = 0x80,
.gpio_bit_cfg_offs = 0x100,
};
static const struct octeon_gpio_data gpio_octeontx_data = {
.probe = PROBE_PCI,
.reg_offs = 0x00,
.gpio_bit_cfg_offs = 0x400,
};
static const struct udevice_id octeon_gpio_ids[] = {
{ .compatible = "cavium,thunder-8890-gpio",
.data = (ulong)&gpio_octeontx_data },
{ .compatible = "cavium,octeon-7890-gpio",
.data = (ulong)&gpio_octeon_data },
{ }
};
U_BOOT_DRIVER(octeon_gpio) = {
.name = "octeon_gpio",
.id = UCLASS_GPIO,
.of_match = of_match_ptr(octeon_gpio_ids),
.probe = octeon_gpio_probe,
.priv_auto = sizeof(struct octeon_gpio),
.ops = &octeon_gpio_ops,
.flags = DM_FLAG_PRE_RELOC,
};
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