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 
15 struct altera_sysid_regs {
16 	u32	id;		/* The system build id */
17 	u32	timestamp;	/* Timestamp */
18 };
19 
20 struct altera_sysid_plat {
21 	struct altera_sysid_regs *regs;
22 };
23 
display_sysid(void)24 void 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 
do_sysid(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])47 int do_sysid(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
48 {
49 	display_sysid();
50 	return 0;
51 }
52 
53 U_BOOT_CMD(
54 	sysid,	1,	1,	do_sysid,
55 	"display Nios-II system id",
56 	""
57 );
58 
altera_sysid_read(struct udevice * dev,int offset,void * buf,int size)59 static int altera_sysid_read(struct udevice *dev,
60 			     int offset, void *buf, int size)
61 {
62 	struct altera_sysid_plat *plat = dev_get_plat(dev);
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 
altera_sysid_of_to_plat(struct udevice * dev)72 static int altera_sysid_of_to_plat(struct udevice *dev)
73 {
74 	struct altera_sysid_plat *plat = dev_get_plat(dev);
75 
76 	plat->regs = map_physmem(dev_read_addr(dev),
77 				 sizeof(struct altera_sysid_regs),
78 				 MAP_NOCACHE);
79 
80 	return 0;
81 }
82 
83 static const struct misc_ops altera_sysid_ops = {
84 	.read = altera_sysid_read,
85 };
86 
87 static const struct udevice_id altera_sysid_ids[] = {
88 	{ .compatible = "altr,sysid-1.0" },
89 	{}
90 };
91 
92 U_BOOT_DRIVER(altera_sysid) = {
93 	.name	= "altera_sysid",
94 	.id	= UCLASS_MISC,
95 	.of_match = altera_sysid_ids,
96 	.of_to_plat = altera_sysid_of_to_plat,
97 	.plat_auto	= sizeof(struct altera_sysid_plat),
98 	.ops	= &altera_sysid_ops,
99 };
100