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https://github.com/brain-hackers/u-boot-brain
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41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
160 lines
3.9 KiB
C
160 lines
3.9 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 <log.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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int 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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{.compatible = "brcm,bcm2711-gpio"},
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{}
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};
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int bcm283x_pinctl_ofdata_to_platdata(struct udevice *dev)
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{
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struct bcm283x_pinctrl_priv *priv;
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priv = dev_get_priv(dev);
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priv->base_reg = dev_read_addr_ptr(dev);
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if (!priv->base_reg) {
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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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return 0;
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}
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int bcm283x_pinctl_probe(struct udevice *dev)
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{
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int ret;
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struct udevice *pdev;
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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_ofnode(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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.ofdata_to_platdata = bcm283x_pinctl_ofdata_to_platdata,
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.priv_auto = 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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#if CONFIG_IS_ENABLED(OF_BOARD)
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.flags = DM_FLAG_PRE_RELOC,
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#endif
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};
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