LXR uboot/drivers/pinctrl/broadcom/pinctrl-bcm283x.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (C) 2018 Alexander Graf <agraf@suse.de>
   4 *
   5 * Based on drivers/pinctrl/mvebu/pinctrl-mvebu.c and
   6 *          drivers/gpio/bcm2835_gpio.c
   7 *
   8 * This driver gets instantiated by the GPIO driver, because both devices
   9 * share the same device node.
  10 * https://spdx.org/licenses
  11 */
  12
  13#include <common.h>
  14#include <config.h>
  15#include <errno.h>
  16#include <dm.h>
  17#include <dm/pinctrl.h>
  18#include <dm/root.h>
  19#include <dm/device-internal.h>
  20#include <dm/lists.h>
  21#include <asm/system.h>
  22#include <asm/io.h>
  23#include <asm/gpio.h>
  24
  25struct bcm283x_pinctrl_priv {
  26        u32 *base_reg;
  27};
  28
  29#define MAX_PINS_PER_BANK 16
  30
  31static void bcm2835_gpio_set_func_id(struct udevice *dev, unsigned int gpio,
  32                                     int func)
  33{
  34        struct bcm283x_pinctrl_priv *priv = dev_get_priv(dev);
  35        int reg_offset;
  36        int field_offset;
  37
  38        reg_offset = BCM2835_GPIO_FSEL_BANK(gpio);
  39        field_offset = BCM2835_GPIO_FSEL_SHIFT(gpio);
  40
  41        clrsetbits_le32(&priv->base_reg[reg_offset],
  42                        BCM2835_GPIO_FSEL_MASK << field_offset,
  43                        (func & BCM2835_GPIO_FSEL_MASK) << field_offset);
  44}
  45
  46static int bcm2835_gpio_get_func_id(struct udevice *dev, unsigned int gpio)
  47{
  48        struct bcm283x_pinctrl_priv *priv = dev_get_priv(dev);
  49        u32 val;
  50
  51        val = readl(&priv->base_reg[BCM2835_GPIO_FSEL_BANK(gpio)]);
  52
  53        return (val >> BCM2835_GPIO_FSEL_SHIFT(gpio) & BCM2835_GPIO_FSEL_MASK);
  54}
  55
  56/*
  57 * bcm283x_pinctrl_set_state: configure pin functions.
  58 * @dev: the pinctrl device to be configured.
  59 * @config: the state to be configured.
  60 * @return: 0 in success
  61 */
  62int bcm283x_pinctrl_set_state(struct udevice *dev, struct udevice *config)
  63{
  64        u32 pin_arr[MAX_PINS_PER_BANK];
  65        u32 function;
  66        int i, len, pin_count = 0;
  67
  68        if (!dev_read_prop(config, "brcm,pins", &len) || !len ||
  69            len & 0x3 || dev_read_u32_array(config, "brcm,pins", pin_arr,
  70                                                  len / sizeof(u32))) {
  71                debug("Failed reading pins array for pinconfig %s (%d)\n",
  72                      config->name, len);
  73                return -EINVAL;
  74        }
  75
  76        pin_count = len / sizeof(u32);
  77
  78        function = dev_read_u32_default(config, "brcm,function", -1);
  79        if (function < 0) {
  80                debug("Failed reading function for pinconfig %s (%d)\n",
  81                      config->name, function);
  82                return -EINVAL;
  83        }
  84
  85        for (i = 0; i < pin_count; i++)
  86                bcm2835_gpio_set_func_id(dev, pin_arr[i], function);
  87
  88        return 0;
  89}
  90
  91static int bcm283x_pinctrl_get_gpio_mux(struct udevice *dev, int banknum,
  92                                        int index)
  93{
  94        if (banknum != 0)
  95                return -EINVAL;
  96
  97        return bcm2835_gpio_get_func_id(dev, index);
  98}
  99
 100static const struct udevice_id bcm2835_pinctrl_id[] = {
 101        {.compatible = "brcm,bcm2835-gpio"},
 102        {}
 103};
 104
 105int bcm283x_pinctl_probe(struct udevice *dev)
 106{
 107        struct bcm283x_pinctrl_priv *priv;
 108        int ret;
 109        struct udevice *pdev;
 110
 111        priv = dev_get_priv(dev);
 112        if (!priv) {
 113                debug("%s: Failed to get private\n", __func__);
 114                return -EINVAL;
 115        }
 116
 117        priv->base_reg = dev_read_addr_ptr(dev);
 118        if (priv->base_reg == (void *)FDT_ADDR_T_NONE) {
 119                debug("%s: Failed to get base address\n", __func__);
 120                return -EINVAL;
 121        }
 122
 123        /* Create GPIO device as well */
 124        ret = device_bind(dev, lists_driver_lookup_name("gpio_bcm2835"),
 125                          "gpio_bcm2835", NULL, dev_of_offset(dev), &pdev);
 126        if (ret) {
 127                /*
 128                 * While we really want the pinctrl driver to work to make
 129                 * devices go where they should go, the GPIO controller is
 130                 * not quite as crucial as it's only rarely used, so don't
 131                 * fail here.
 132                 */
 133                printf("Failed to bind GPIO driver\n");
 134        }
 135
 136        return 0;
 137}
 138
 139static struct pinctrl_ops bcm283x_pinctrl_ops = {
 140        .set_state      = bcm283x_pinctrl_set_state,
 141        .get_gpio_mux   = bcm283x_pinctrl_get_gpio_mux,
 142};
 143
 144U_BOOT_DRIVER(pinctrl_bcm283x) = {
 145        .name           = "bcm283x_pinctrl",
 146        .id             = UCLASS_PINCTRL,
 147        .of_match       = of_match_ptr(bcm2835_pinctrl_id),
 148        .priv_auto_alloc_size = sizeof(struct bcm283x_pinctrl_priv),
 149        .ops            = &bcm283x_pinctrl_ops,
 150        .probe          = bcm283x_pinctl_probe,
 151        .flags          = DM_FLAG_PRE_RELOC,
 152};
 153