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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2018 Alexander Graf <[email protected]>
*
* Based on drivers/pinctrl/mvebu/pinctrl-mvebu.c and
* drivers/gpio/bcm2835_gpio.c
*
* This driver gets instantiated by the GPIO driver, because both devices
* share the same device node.
* https://spdx.org/licenses
*/
#include <config.h>
#include <errno.h>
#include <dm.h>
#include <log.h>
#include <dm/pinctrl.h>
#include <dm/root.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/gpio.h>
#include <dt-bindings/pinctrl/bcm2835.h>
#include <linux/delay.h>
struct bcm283x_pinctrl_priv {
u32 *base_reg;
};
#define MAX_PINS_PER_BANK 16
static void bcm2835_gpio_set_func_id(struct udevice *dev, unsigned int gpio,
int func)
{
struct bcm283x_pinctrl_priv *priv = dev_get_priv(dev);
int reg_offset;
int field_offset;
reg_offset = BCM2835_GPIO_FSEL_BANK(gpio);
field_offset = BCM2835_GPIO_FSEL_SHIFT(gpio);
clrsetbits_le32(&priv->base_reg[reg_offset],
BCM2835_GPIO_FSEL_MASK << field_offset,
(func & BCM2835_GPIO_FSEL_MASK) << field_offset);
}
static int bcm2835_gpio_get_func_id(struct udevice *dev, unsigned int gpio)
{
struct bcm283x_pinctrl_priv *priv = dev_get_priv(dev);
u32 val;
val = readl(&priv->base_reg[BCM2835_GPIO_FSEL_BANK(gpio)]);
return (val >> BCM2835_GPIO_FSEL_SHIFT(gpio) & BCM2835_GPIO_FSEL_MASK);
}
/*
* bcm2835_gpio_set_pull: Set GPIO pull-up/down resistor for BCM2835
* @dev: the pinctrl device
* @gpio: the GPIO pin number
* @pull: pull setting (BCM2835_PUD_OFF, BCM2835_PUD_DOWN, BCM2835_PUD_UP)
*/
static void bcm2835_gpio_set_pull(struct udevice *dev, unsigned int gpio, int pull)
{
struct bcm283x_pinctrl_priv *priv = dev_get_priv(dev);
u32 bank = BCM2835_GPPUDCLK0 + BCM2835_GPIO_COMMON_BANK(gpio);
u32 bit = BCM2835_GPIO_COMMON_SHIFT(gpio);
/* Set required control signal */
writel(pull & 0x3, &priv->base_reg[BCM2835_GPPUD]);
udelay(1);
/* Clock the control signal into the GPIO pads */
writel(1 << bit, &priv->base_reg[bank]);
udelay(1);
/* Remove the control signal and clock */
writel(0, &priv->base_reg[BCM2835_GPPUD]);
writel(0, &priv->base_reg[bank]);
}
/*
* bcm2711_gpio_set_pull: Set GPIO pull-up/down resistor for BCM2711
* @dev: the pinctrl device
* @gpio: the GPIO pin number
* @pull: pull setting (BCM2835_PUD_OFF, BCM2835_PUD_DOWN, BCM2835_PUD_UP)
*/
static void bcm2711_gpio_set_pull(struct udevice *dev, unsigned int gpio, int pull)
{
struct bcm283x_pinctrl_priv *priv = dev_get_priv(dev);
u32 reg_offset;
u32 bit_shift;
u32 pull_bits;
/* Findout which GPIO_PUP_PDN_CNTRL register to use */
reg_offset = BCM2711_GPPUD_CNTRL_REG0 + BCM2711_PUD_REG_OFFSET(gpio);
/* Findout the bit position */
bit_shift = BCM2711_PUD_REG_SHIFT(gpio);
/* Update the 2-bit field for this GPIO */
pull_bits = pull & BCM2711_PUD_2711_MASK;
clrsetbits_le32(&priv->base_reg[reg_offset],
BCM2711_PUD_2711_MASK << bit_shift,
pull_bits << bit_shift);
}
static void bcm283x_gpio_set_pull(struct udevice *dev, unsigned int gpio, int pull)
{
if (device_is_compatible(dev, "brcm,bcm2835-gpio"))
bcm2835_gpio_set_pull(dev, gpio, pull);
else
bcm2711_gpio_set_pull(dev, gpio, pull);
}
/*
* bcm283x_pinctrl_set_state: configure pin functions and pull states.
* @dev: the pinctrl device to be configured.
* @config: the state to be configured.
* @return: 0 in success
*/
int bcm283x_pinctrl_set_state(struct udevice *dev, struct udevice *config)
{
u32 pin_arr[MAX_PINS_PER_BANK];
u32 pull_arr[MAX_PINS_PER_BANK];
int function;
int i, len, pin_count = 0, pull_len = 0, pull_count = 0;
int pull_value;
if (!dev_read_prop(config, "brcm,pins", &len) || !len ||
len & 0x3 || dev_read_u32_array(config, "brcm,pins", pin_arr,
len / sizeof(u32))) {
debug("Failed reading pins array for pinconfig %s (%d)\n",
config->name, len);
return -EINVAL;
}
pin_count = len / sizeof(u32);
function = dev_read_u32_default(config, "brcm,function", -1);
if (function < 0) {
debug("Failed reading function for pinconfig %s (%d)\n",
config->name, function);
return -EINVAL;
}
/* Check if brcm,pull property exists */
if (dev_read_prop(config, "brcm,pull", &pull_len) && pull_len > 0) {
if (pull_len & 0x3) {
debug("Invalid pull array length for pinconfig %s (%d)\n",
config->name, pull_len);
return -EINVAL;
}
pull_count = pull_len / sizeof(u32);
if (pull_count != 1 && pull_count != pin_count) {
debug("Pull array count (%d) must be 1 or match pin count (%d) for pinconfig %s\n",
pull_count, pin_count, config->name);
return -EINVAL;
}
if (dev_read_u32_array(config, "brcm,pull", pull_arr, pull_count)) {
debug("Failed reading pull array for pinconfig %s\n", config->name);
return -EINVAL;
}
/* Validate pull values */
for (i = 0; i < pull_count; i++) {
if (pull_arr[i] > 2) {
debug("Invalid pull value %d for pin %d in pinconfig %s\n",
pull_arr[i], pin_arr[i], config->name);
return -EINVAL;
}
}
}
for (i = 0; i < pin_count; i++) {
bcm2835_gpio_set_func_id(dev, pin_arr[i], function);
if (pull_count > 0) {
pull_value = (pull_count == 1) ? pull_arr[0] : pull_arr[i];
bcm283x_gpio_set_pull(dev, pin_arr[i], pull_value);
}
}
return 0;
}
static int bcm283x_pinctrl_get_gpio_mux(struct udevice *dev, int banknum,
int index)
{
if (banknum != 0)
return -EINVAL;
return bcm2835_gpio_get_func_id(dev, index);
}
static const struct udevice_id bcm2835_pinctrl_id[] = {
{.compatible = "brcm,bcm2835-gpio"},
{.compatible = "brcm,bcm2711-gpio"},
{}
};
int bcm283x_pinctl_of_to_plat(struct udevice *dev)
{
struct bcm283x_pinctrl_priv *priv;
priv = dev_get_priv(dev);
priv->base_reg = dev_read_addr_ptr(dev);
if (!priv->base_reg) {
debug("%s: Failed to get base address\n", __func__);
return -EINVAL;
}
return 0;
}
int bcm283x_pinctl_probe(struct udevice *dev)
{
int ret;
struct udevice *pdev;
/* Create GPIO device as well */
ret = device_bind(dev, lists_driver_lookup_name("gpio_bcm2835"),
"gpio_bcm2835", NULL, dev_ofnode(dev), &pdev);
if (ret) {
/*
* While we really want the pinctrl driver to work to make
* devices go where they should go, the GPIO controller is
* not quite as crucial as it's only rarely used, so don't
* fail here.
*/
printf("Failed to bind GPIO driver\n");
}
return 0;
}
static struct pinctrl_ops bcm283x_pinctrl_ops = {
.set_state = bcm283x_pinctrl_set_state,
.get_gpio_mux = bcm283x_pinctrl_get_gpio_mux,
};
U_BOOT_DRIVER(pinctrl_bcm283x) = {
.name = "bcm283x_pinctrl",
.id = UCLASS_PINCTRL,
.of_match = of_match_ptr(bcm2835_pinctrl_id),
.of_to_plat = bcm283x_pinctl_of_to_plat,
.priv_auto = sizeof(struct bcm283x_pinctrl_priv),
.ops = &bcm283x_pinctrl_ops,
.probe = bcm283x_pinctl_probe,
#if IS_ENABLED(CONFIG_OF_BOARD)
.flags = DM_FLAG_PRE_RELOC,
#endif
};
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