1/*
2 * Copyright (C) ST-Ericsson SA 2010
3 *
4 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
5 * License terms: GNU General Public License (GPL) version 2
6 */
7
8#include <linux/kernel.h>
9#include <linux/init.h>
10#include <linux/io.h>
11
12#include <asm/cputype.h>
13#include <asm/tlbflush.h>
14#include <asm/cacheflush.h>
15#include <asm/mach/map.h>
16
17#include "setup.h"
18
19#include "db8500-regs.h"
20#include "id.h"
21
22struct dbx500_asic_id dbx500_id;
23
24static unsigned int __init ux500_read_asicid(phys_addr_t addr)
25{
26	phys_addr_t base = addr & ~0xfff;
27	struct map_desc desc = {
28		.virtual	= (unsigned long)UX500_VIRT_ROM,
29		.pfn		= __phys_to_pfn(base),
30		.length		= SZ_16K,
31		.type		= MT_DEVICE,
32	};
33
34	iotable_init(&desc, 1);
35
36	/* As in devicemaps_init() */
37	local_flush_tlb_all();
38	flush_cache_all();
39
40	return readl(UX500_VIRT_ROM + (addr & 0xfff));
41}
42
43static void ux500_print_soc_info(unsigned int asicid)
44{
45	unsigned int rev = dbx500_revision();
46
47	pr_info("DB%4x ", dbx500_partnumber());
48
49	if (rev == 0x01)
50		pr_cont("Early Drop");
51	else if (rev >= 0xA0)
52		pr_cont("v%d.%d" , (rev >> 4) - 0xA + 1, rev & 0xf);
53	else
54		pr_cont("Unknown");
55
56	pr_cont(" [%#010x]\n", asicid);
57}
58
59static unsigned int partnumber(unsigned int asicid)
60{
61	return (asicid >> 8) & 0xffff;
62}
63
64/*
65 * SOC		MIDR		ASICID ADDRESS		ASICID VALUE
66 * DB8500ed	0x410fc090	0x9001FFF4		0x00850001
67 * DB8500v1	0x411fc091	0x9001FFF4		0x008500A0
68 * DB8500v1.1	0x411fc091	0x9001FFF4		0x008500A1
69 * DB8500v2	0x412fc091	0x9001DBF4		0x008500B0
70 * DB8520v2.2	0x412fc091	0x9001DBF4		0x008500B2
71 * DB5500v1	0x412fc091	0x9001FFF4		0x005500A0
72 * DB9540	0x413fc090	0xFFFFDBF4		0x009540xx
73 */
74
75void __init ux500_map_io(void)
76{
77	unsigned int cpuid = read_cpuid_id();
78	unsigned int asicid = 0;
79	phys_addr_t addr = 0;
80
81	switch (cpuid) {
82	case 0x410fc090: /* DB8500ed */
83	case 0x411fc091: /* DB8500v1 */
84		addr = 0x9001FFF4;
85		break;
86
87	case 0x412fc091: /* DB8520 / DB8500v2 / DB5500v1 */
88		asicid = ux500_read_asicid(0x9001DBF4);
89		if (partnumber(asicid) == 0x8500 ||
90		    partnumber(asicid) == 0x8520)
91			/* DB8500v2 */
92			break;
93
94		/* DB5500v1 */
95		addr = 0x9001FFF4;
96		break;
97
98	case 0x413fc090: /* DB9540 */
99		addr = 0xFFFFDBF4;
100		break;
101	}
102
103	if (addr)
104		asicid = ux500_read_asicid(addr);
105
106	if (!asicid) {
107		pr_err("Unable to identify SoC\n");
108		ux500_unknown_soc();
109	}
110
111	dbx500_id.process = asicid >> 24;
112	dbx500_id.partnumber = partnumber(asicid);
113	dbx500_id.revision = asicid & 0xff;
114
115	ux500_print_soc_info(asicid);
116}
117