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1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * System Specific setup for Soekris net5501
4  * At the moment this means setup of GPIO control of LEDs and buttons
5  * on net5501 boards.
6  *
7  * Copyright (C) 2008-2009 Tower Technologies
8  * Written by Alessandro Zummo <[email protected]>
9  *
10  * Copyright (C) 2008 Constantin Baranov <[email protected]>
11  * Copyright (C) 2011 Ed Wildgoose <[email protected]>
12  *                and Philip Prindeville <[email protected]>
13  */
14
15 #include <linux/kernel.h>
16 #include <linux/init.h>
17 #include <linux/io.h>
18 #include <linux/string.h>
19 #include <linux/input.h>
20 #include <linux/gpio/machine.h>
21 #include <linux/gpio/property.h>
22
23 #include <asm/geode.h>
24
25 #include "geode-common.h"
26
27 #define BIOS_REGION_BASE                0xffff0000
28 #define BIOS_REGION_SIZE                0x00010000
29
30 static const struct geode_led net5501_leds[] __initconst = {
31         { 6, true },
32 };
33
34 static void __init register_net5501(void)
35 {
36         geode_create_restart_key(24);
37         geode_create_leds("net5501", net5501_leds, ARRAY_SIZE(net5501_leds));
38 }
39
40 struct net5501_board {
41         u16     offset;
42         u16     len;
43         char    *sig;
44 };
45
46 static struct net5501_board __initdata boards[] = {
47         { 0xb7b, 7, "net5501" },        /* net5501 v1.33/1.33c */
48         { 0xb1f, 7, "net5501" },        /* net5501 v1.32i */
49 };
50
51 static bool __init net5501_present(void)
52 {
53         int i;
54         unsigned char *rombase, *bios;
55         bool found = false;
56
57         rombase = ioremap(BIOS_REGION_BASE, BIOS_REGION_SIZE - 1);
58         if (!rombase) {
59                 printk(KERN_ERR "%s: failed to get rombase\n", KBUILD_MODNAME);
60                 return found;
61         }
62
63         bios = rombase + 0x20;  /* null terminated */
64
65         if (memcmp(bios, "comBIOS", 7))
66                 goto unmap;
67
68         for (i = 0; i < ARRAY_SIZE(boards); i++) {
69                 unsigned char *model = rombase + boards[i].offset;
70
71                 if (!memcmp(model, boards[i].sig, boards[i].len)) {
72                         printk(KERN_INFO "%s: system is recognized as \"%s\"\n",
73                                KBUILD_MODNAME, model);
74
75                         found = true;
76                         break;
77                 }
78         }
79
80 unmap:
81         iounmap(rombase);
82         return found;
83 }
84
85 static int __init net5501_init(void)
86 {
87         if (!is_geode())
88                 return 0;
89
90         if (!net5501_present())
91                 return 0;
92
93         register_net5501();
94
95         return 0;
96 }
97 device_initcall(net5501_init);
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