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 <misc.h>
  11#include <asm/io.h>
  12
  13struct microchip_flexcom_regs {
  14        u32 cr;
  15};
  16
  17struct microchip_flexcom_platdata {
  18        struct microchip_flexcom_regs *regs;
  19        u32 flexcom_mode;
  20};
  21
  22static int microchip_flexcom_ofdata_to_platdata(struct udevice *dev)
  23{
  24        struct microchip_flexcom_platdata *plat = dev_get_platdata(dev);
  25        int ret;
  26
  27        plat->regs = map_physmem(devfdt_get_addr(dev),
  28                                 sizeof(struct microchip_flexcom_regs),
  29                                MAP_NOCACHE);
  30
  31        ret = dev_read_u32(dev, "atmel,flexcom-mode", &plat->flexcom_mode);
  32
  33        if (IS_ERR_VALUE(ret)) {
  34                debug("Missing atmel,flexcom-mode property\n");
  35                return ret;
  36        }
  37
  38        /*
  39         * The mode must have only 2 bits. If any other bits are set,
  40         * the value is not supported.
  41         */
  42        if (plat->flexcom_mode & 0xfffffffc) {
  43                debug("Wrong atmel,flexcom-mode property\n");
  44                return -EINVAL;
  45        }
  46
  47        writel(plat->flexcom_mode, &plat->regs->cr);
  48
  49        return 0;
  50}
  51
  52static const struct udevice_id microchip_flexcom_ids[] = {
  53        { .compatible = "atmel,sama5d2-flexcom" },
  54        { .compatible = "microchip,flexcom" },
  55        {}
  56};
  57
  58U_BOOT_DRIVER(microchip_flexcom) = {
  59        .name   = "microchip_flexcom",
  60        .id     = UCLASS_MISC,
  61        .of_match = microchip_flexcom_ids,
  62        .ofdata_to_platdata = microchip_flexcom_ofdata_to_platdata,
  63        .platdata_auto_alloc_size = sizeof(struct microchip_flexcom_platdata),
  64};
  65