LXR uboot/drivers/misc/microchip

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * (C) Copyright 2019, Microchip Technology, Inc.
   4 * Author: Eugen Hristev <eugen.hristev@microchip.com>
   5 */
   6
   7#include <common.h>
   8#include <dm.h>
   9#include <errno.h>
  10#include <log.h>
  11#include <misc.h>
  12#include <asm/io.h>
  13#include <linux/err.h>
  14
  15struct microchip_flexcom_regs {
  16        u32 cr;
  17};
  18
  19struct microchip_flexcom_plat {
  20        struct microchip_flexcom_regs *regs;
  21        u32 flexcom_mode;
  22};
  23
  24static int microchip_flexcom_of_to_plat(struct udevice *dev)
  25{
  26        struct microchip_flexcom_plat *plat = dev_get_plat(dev);
  27        int ret;
  28
  29        plat->regs = map_physmem(dev_read_addr(dev),
  30                                 sizeof(struct microchip_flexcom_regs),
  31                                MAP_NOCACHE);
  32
  33        ret = dev_read_u32(dev, "atmel,flexcom-mode", &plat->flexcom_mode);
  34
  35        if (IS_ERR_VALUE(ret)) {
  36                debug("Missing atmel,flexcom-mode property\n");
  37                return ret;
  38        }
  39
  40        /*
  41         * The mode must have only 2 bits. If any other bits are set,
  42         * the value is not supported.
  43         */
  44        if (plat->flexcom_mode & 0xfffffffc) {
  45                debug("Wrong atmel,flexcom-mode property\n");
  46                return -EINVAL;
  47        }
  48
  49        writel(plat->flexcom_mode, &plat->regs->cr);
  50
  51        return 0;
  52}
  53
  54static const struct udevice_id microchip_flexcom_ids[] = {
  55        { .compatible = "atmel,sama5d2-flexcom" },
  56        { .compatible = "microchip,flexcom" },
  57        {}
  58};
  59
  60U_BOOT_DRIVER(microchip_flexcom) = {
  61        .name   = "microchip_flexcom",
  62        .id     = UCLASS_MISC,
  63        .of_match = microchip_flexcom_ids,
  64        .of_to_plat = microchip_flexcom_of_to_plat,
  65        .plat_auto      = sizeof(struct microchip_flexcom_plat),
  66};
  67