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}