LXR uboot/drivers/misc/altera

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
   4 * Scott McNutt <smcnutt@psyent.com>
   5 */
   6
   7#include <common.h>
   8#include <command.h>
   9#include <dm.h>
  10#include <errno.h>
  11#include <misc.h>
  12#include <linux/time.h>
  13#include <asm/io.h>
  14
  15struct altera_sysid_regs {
  16        u32     id;             /* The system build id */
  17        u32     timestamp;      /* Timestamp */
  18};
  19
  20struct altera_sysid_platdata {
  21        struct altera_sysid_regs *regs;
  22};
  23
  24void display_sysid(void)
  25{
  26        struct udevice *dev;
  27        u32 sysid[2];
  28        struct tm t;
  29        char asc[32];
  30        time_t stamp;
  31        int ret;
  32
  33        /* the first misc device will be used */
  34        ret = uclass_first_device_err(UCLASS_MISC, &dev);
  35        if (ret)
  36                return;
  37        ret = misc_read(dev, 0, &sysid, sizeof(sysid));
  38        if (ret < 0)
  39                return;
  40
  41        stamp = sysid[1];
  42        localtime_r(&stamp, &t);
  43        asctime_r(&t, asc);
  44        printf("SYSID: %08x, %s", sysid[0], asc);
  45}
  46
  47int do_sysid(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  48{
  49        display_sysid();
  50        return 0;
  51}
  52
  53U_BOOT_CMD(
  54        sysid,  1,      1,      do_sysid,
  55        "display Nios-II system id",
  56        ""
  57);
  58
  59static int altera_sysid_read(struct udevice *dev,
  60                             int offset, void *buf, int size)
  61{
  62        struct altera_sysid_platdata *plat = dev->platdata;
  63        struct altera_sysid_regs *const regs = plat->regs;
  64        u32 *sysid = buf;
  65
  66        sysid[0] = readl(&regs->id);
  67        sysid[1] = readl(&regs->timestamp);
  68
  69        return 0;
  70}
  71
  72static int altera_sysid_ofdata_to_platdata(struct udevice *dev)
  73{
  74        struct altera_sysid_platdata *plat = dev_get_platdata(dev);
  75
  76        plat->regs = map_physmem(devfdt_get_addr(dev),
  77                                 sizeof(struct altera_sysid_regs),
  78                                 MAP_NOCACHE);
  79
  80        return 0;
  81}
  82
  83static const struct misc_ops altera_sysid_ops = {
  84        .read = altera_sysid_read,
  85};
  86
  87static const struct udevice_id altera_sysid_ids[] = {
  88        { .compatible = "altr,sysid-1.0" },
  89        {}
  90};
  91
  92U_BOOT_DRIVER(altera_sysid) = {
  93        .name   = "altera_sysid",
  94        .id     = UCLASS_MISC,
  95        .of_match = altera_sysid_ids,
  96        .ofdata_to_platdata = altera_sysid_ofdata_to_platdata,
  97        .platdata_auto_alloc_size = sizeof(struct altera_sysid_platdata),
  98        .ops    = &altera_sysid_ops,
  99};
 100