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https://github.com/AsahiLinux/u-boot
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
152 lines
3.8 KiB
C
152 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2018 Alexander Graf <agraf@suse.de>
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*
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* Based on drivers/pinctrl/mvebu/pinctrl-mvebu.c and
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* drivers/gpio/bcm2835_gpio.c
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*
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* This driver gets instantiated by the GPIO driver, because both devices
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* share the same device node.
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* https://spdx.org/licenses
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*/
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#include <common.h>
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#include <config.h>
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#include <errno.h>
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#include <dm.h>
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#include <dm/pinctrl.h>
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#include <dm/root.h>
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#include <dm/device-internal.h>
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#include <dm/lists.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <asm/gpio.h>
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struct bcm283x_pinctrl_priv {
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u32 *base_reg;
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};
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#define MAX_PINS_PER_BANK 16
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static void bcm2835_gpio_set_func_id(struct udevice *dev, unsigned int gpio,
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int func)
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{
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struct bcm283x_pinctrl_priv *priv = dev_get_priv(dev);
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int reg_offset;
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int field_offset;
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reg_offset = BCM2835_GPIO_FSEL_BANK(gpio);
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field_offset = BCM2835_GPIO_FSEL_SHIFT(gpio);
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clrsetbits_le32(&priv->base_reg[reg_offset],
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BCM2835_GPIO_FSEL_MASK << field_offset,
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(func & BCM2835_GPIO_FSEL_MASK) << field_offset);
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}
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static int bcm2835_gpio_get_func_id(struct udevice *dev, unsigned int gpio)
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{
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struct bcm283x_pinctrl_priv *priv = dev_get_priv(dev);
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u32 val;
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val = readl(&priv->base_reg[BCM2835_GPIO_FSEL_BANK(gpio)]);
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return (val >> BCM2835_GPIO_FSEL_SHIFT(gpio) & BCM2835_GPIO_FSEL_MASK);
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}
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/*
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* bcm283x_pinctrl_set_state: configure pin functions.
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* @dev: the pinctrl device to be configured.
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* @config: the state to be configured.
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* @return: 0 in success
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*/
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int bcm283x_pinctrl_set_state(struct udevice *dev, struct udevice *config)
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{
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u32 pin_arr[MAX_PINS_PER_BANK];
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u32 function;
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int i, len, pin_count = 0;
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if (!dev_read_prop(config, "brcm,pins", &len) || !len ||
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len & 0x3 || dev_read_u32_array(config, "brcm,pins", pin_arr,
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len / sizeof(u32))) {
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debug("Failed reading pins array for pinconfig %s (%d)\n",
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config->name, len);
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return -EINVAL;
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}
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pin_count = len / sizeof(u32);
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function = dev_read_u32_default(config, "brcm,function", -1);
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if (function < 0) {
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debug("Failed reading function for pinconfig %s (%d)\n",
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config->name, function);
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return -EINVAL;
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}
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for (i = 0; i < pin_count; i++)
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bcm2835_gpio_set_func_id(dev, pin_arr[i], function);
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return 0;
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}
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static int bcm283x_pinctrl_get_gpio_mux(struct udevice *dev, int banknum,
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int index)
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{
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if (banknum != 0)
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return -EINVAL;
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return bcm2835_gpio_get_func_id(dev, index);
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}
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static const struct udevice_id bcm2835_pinctrl_id[] = {
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{.compatible = "brcm,bcm2835-gpio"},
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{}
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};
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int bcm283x_pinctl_probe(struct udevice *dev)
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{
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struct bcm283x_pinctrl_priv *priv;
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int ret;
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struct udevice *pdev;
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priv = dev_get_priv(dev);
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if (!priv) {
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debug("%s: Failed to get private\n", __func__);
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return -EINVAL;
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}
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priv->base_reg = dev_read_addr_ptr(dev);
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if (priv->base_reg == (void *)FDT_ADDR_T_NONE) {
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debug("%s: Failed to get base address\n", __func__);
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return -EINVAL;
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}
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/* Create GPIO device as well */
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ret = device_bind(dev, lists_driver_lookup_name("gpio_bcm2835"),
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"gpio_bcm2835", NULL, dev_of_offset(dev), &pdev);
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if (ret) {
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/*
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* While we really want the pinctrl driver to work to make
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* devices go where they should go, the GPIO controller is
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* not quite as crucial as it's only rarely used, so don't
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* fail here.
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*/
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printf("Failed to bind GPIO driver\n");
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}
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return 0;
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}
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static struct pinctrl_ops bcm283x_pinctrl_ops = {
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.set_state = bcm283x_pinctrl_set_state,
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.get_gpio_mux = bcm283x_pinctrl_get_gpio_mux,
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};
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U_BOOT_DRIVER(pinctrl_bcm283x) = {
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.name = "bcm283x_pinctrl",
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.id = UCLASS_PINCTRL,
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.of_match = of_match_ptr(bcm2835_pinctrl_id),
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.priv_auto_alloc_size = sizeof(struct bcm283x_pinctrl_priv),
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.ops = &bcm283x_pinctrl_ops,
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.probe = bcm283x_pinctl_probe,
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.flags = DM_FLAG_PRE_RELOC,
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};
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