LXR uboot/drivers/misc/altera

   1/*
   2 * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
   3 * Scott McNutt <smcnutt@psyent.com>
   4 *
   5 * SPDX-License-Identifier:     GPL-2.0+
   6 */
   7
   8#include <common.h>
   9#include <command.h>
  10#include <dm.h>
  11#include <errno.h>
  12#include <misc.h>
  13#include <linux/time.h>
  14#include <asm/io.h>
  15
  16struct altera_sysid_regs {
  17        u32     id;             /* The system build id */
  18        u32     timestamp;      /* Timestamp */
  19};
  20
  21struct altera_sysid_platdata {
  22        struct altera_sysid_regs *regs;
  23};
  24
  25void display_sysid(void)
  26{
  27        struct udevice *dev;
  28        u32 sysid[2];
  29        struct tm t;
  30        char asc[32];
  31        time_t stamp;
  32        int ret;
  33
  34        /* the first misc device will be used */
  35        ret = uclass_first_device_err(UCLASS_MISC, &dev);
  36        if (ret)
  37                return;
  38        ret = misc_read(dev, 0, &sysid, sizeof(sysid));
  39        if (ret)
  40                return;
  41
  42        stamp = sysid[1];
  43        localtime_r(&stamp, &t);
  44        asctime_r(&t, asc);
  45        printf("SYSID: %08x, %s", sysid[0], asc);
  46}
  47
  48int do_sysid(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  49{
  50        display_sysid();
  51        return 0;
  52}
  53
  54U_BOOT_CMD(
  55        sysid,  1,      1,      do_sysid,
  56        "display Nios-II system id",
  57        ""
  58);
  59
  60static int altera_sysid_read(struct udevice *dev,
  61                             int offset, void *buf, int size)
  62{
  63        struct altera_sysid_platdata *plat = dev->platdata;
  64        struct altera_sysid_regs *const regs = plat->regs;
  65        u32 *sysid = buf;
  66
  67        sysid[0] = readl(&regs->id);
  68        sysid[1] = readl(&regs->timestamp);
  69
  70        return 0;
  71}
  72
  73static int altera_sysid_ofdata_to_platdata(struct udevice *dev)
  74{
  75        struct altera_sysid_platdata *plat = dev_get_platdata(dev);
  76
  77        plat->regs = map_physmem(devfdt_get_addr(dev),
  78                                 sizeof(struct altera_sysid_regs),
  79                                 MAP_NOCACHE);
  80
  81        return 0;
  82}
  83
  84static const struct misc_ops altera_sysid_ops = {
  85        .read = altera_sysid_read,
  86};
  87
  88static const struct udevice_id altera_sysid_ids[] = {
  89        { .compatible = "altr,sysid-1.0" },
  90        {}
  91};
  92
  93U_BOOT_DRIVER(altera_sysid) = {
  94        .name   = "altera_sysid",
  95        .id     = UCLASS_MISC,
  96        .of_match = altera_sysid_ids,
  97        .ofdata_to_platdata = altera_sysid_ofdata_to_platdata,
  98        .platdata_auto_alloc_size = sizeof(struct altera_sysid_platdata),
  99        .ops    = &altera_sysid_ops,
 100};
 101