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#include <linux/err.h>
  13
  14struct microchip_flexcom_regs {
  15        u32 cr;
  16};
  17
  18struct microchip_flexcom_platdata {
  19        struct microchip_flexcom_regs *regs;
  20        u32 flexcom_mode;
  21};
  22
  23static int microchip_flexcom_ofdata_to_platdata(struct udevice *dev)
  24{
  25        struct microchip_flexcom_platdata *plat = dev_get_platdata(dev);
  26        int ret;
  27
  28        plat->regs = map_physmem(devfdt_get_addr(dev),
  29                                 sizeof(struct microchip_flexcom_regs),
  30                                MAP_NOCACHE);
  31
  32        ret = dev_read_u32(dev, "atmel,flexcom-mode", &plat->flexcom_mode);
  33
  34        if (IS_ERR_VALUE(ret)) {
  35                debug("Missing atmel,flexcom-mode property\n");
  36                return ret;
  37        }
  38
  39        /*
  40         * The mode must have only 2 bits. If any other bits are set,
  41         * the value is not supported.
  42         */
  43        if (plat->flexcom_mode & 0xfffffffc) {
  44                debug("Wrong atmel,flexcom-mode property\n");
  45                return -EINVAL;
  46        }
  47
  48        writel(plat->flexcom_mode, &plat->regs->cr);
  49
  50        return 0;
  51}
  52
  53static const struct udevice_id microchip_flexcom_ids[] = {
  54        { .compatible = "atmel,sama5d2-flexcom" },
  55        { .compatible = "microchip,flexcom" },
  56        {}
  57};
  58
  59U_BOOT_DRIVER(microchip_flexcom) = {
  60        .name   = "microchip_flexcom",
  61        .id     = UCLASS_MISC,
  62        .of_match = microchip_flexcom_ids,
  63        .ofdata_to_platdata = microchip_flexcom_ofdata_to_platdata,
  64        .platdata_auto_alloc_size = sizeof(struct microchip_flexcom_platdata),
  65};
  66