drivers/misc/altera_sysid.c

   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
  16 struct altera_sysid_regs {
  17         u32     id;             /* The system build id */
  18         u32     timestamp;      /* Timestamp */
  19 };
  20
  21 struct altera_sysid_platdata {
  22         struct altera_sysid_regs *regs;
  23 };
  24
  25 void 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
  48 int do_sysid(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  49 {
  50         display_sysid();
  51         return 0;
  52 }
  53
  54 U_BOOT_CMD(
  55         sysid,  1,      1,      do_sysid,
  56         "display Nios-II system id",
  57         ""
  58 );
  59
  60 static 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
  73 static 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
  84 static const struct misc_ops altera_sysid_ops = {
  85         .read = altera_sysid_read,
  86 };
  87
  88 static const struct udevice_id altera_sysid_ids[] = {
  89         { .compatible = "altr,sysid-1.0" },
  90         {}
  91 };
  92
  93 U_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 };