cpu-db8500.c revision fcbd458e95316fe5031f1b8eaf5e66ce8f3c3146 
1/*
2 * Copyright (C) 2008-2009 ST-Ericsson
3 *
4 * Author: Srinidhi KASAGAR <srinidhi.kasagar@stericsson.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2, as
8 * published by the Free Software Foundation.
9 *
10 */
11#include <linux/types.h>
12#include <linux/init.h>
13#include <linux/device.h>
14#include <linux/amba/bus.h>
15#include <linux/irq.h>
16#include <linux/gpio.h>
17#include <linux/platform_device.h>
18#include <linux/io.h>
19
20#include <asm/mach/map.h>
21#include <mach/hardware.h>
22#include <mach/setup.h>
23#include <mach/devices.h>
24
25#include "devices-db8500.h"
26
27static struct platform_device *platform_devs[] __initdata = {
28	&u8500_gpio_devs[0],
29	&u8500_gpio_devs[1],
30	&u8500_gpio_devs[2],
31	&u8500_gpio_devs[3],
32	&u8500_gpio_devs[4],
33	&u8500_gpio_devs[5],
34	&u8500_gpio_devs[6],
35	&u8500_gpio_devs[7],
36	&u8500_gpio_devs[8],
37	&u8500_dma40_device,
38};
39
40/* minimum static i/o mapping required to boot U8500 platforms */
41static struct map_desc u8500_io_desc[] __initdata = {
42	__IO_DEV_DESC(U8500_PRCMU_BASE, SZ_4K),
43	__IO_DEV_DESC(U8500_GPIO0_BASE, SZ_4K),
44	__IO_DEV_DESC(U8500_GPIO1_BASE, SZ_4K),
45	__IO_DEV_DESC(U8500_GPIO2_BASE, SZ_4K),
46	__IO_DEV_DESC(U8500_GPIO3_BASE, SZ_4K),
47	__MEM_DEV_DESC(U8500_BOOT_ROM_BASE, SZ_1M),
48};
49
50static struct map_desc u8500_ed_io_desc[] __initdata = {
51	__IO_DEV_DESC(U8500_MTU0_BASE_ED, SZ_4K),
52	__IO_DEV_DESC(U8500_CLKRST7_BASE_ED, SZ_8K),
53};
54
55static struct map_desc u8500_v1_io_desc[] __initdata = {
56	__IO_DEV_DESC(U8500_MTU0_BASE, SZ_4K),
57	__IO_DEV_DESC(U8500_PRCMU_TCDM_BASE_V1, SZ_4K),
58};
59
60static struct map_desc u8500_v2_io_desc[] __initdata = {
61	__IO_DEV_DESC(U8500_PRCMU_TCDM_BASE, SZ_4K),
62};
63
64/*
65 * Functions to differentiate between later ASICs
66 * We look into the end of the ROM to locate the hardcoded ASIC ID.
67 * This is only needed to differentiate between minor revisions and
68 * process variants of an ASIC, the major revisions are encoded in
69 * the cpuid.
70 */
71#define U8500_ASIC_ID_LOC_ED_V1	(U8500_BOOT_ROM_BASE + 0x1FFF4)
72#define U8500_ASIC_ID_LOC_V2	(U8500_BOOT_ROM_BASE + 0x1DBF4)
73#define U8500_ASIC_REV_ED	0x01
74#define U8500_ASIC_REV_V10	0xA0
75#define U8500_ASIC_REV_V11	0xA1
76#define U8500_ASIC_REV_V20	0xB0
77
78/**
79 * struct db8500_asic_id - fields of the ASIC ID
80 * @process: the manufacturing process, 0x40 is 40 nm
81 *  0x00 is "standard"
82 * @partnumber: hithereto 0x8500 for DB8500
83 * @revision: version code in the series
84 * This field definion is not formally defined but makes
85 * sense.
86 */
87struct db8500_asic_id {
88	u8 process;
89	u16 partnumber;
90	u8 revision;
91};
92
93/* This isn't going to change at runtime */
94static struct db8500_asic_id db8500_id;
95
96static void __init get_db8500_asic_id(void)
97{
98	u32 asicid;
99
100	if (cpu_is_u8500v1() || cpu_is_u8500ed())
101		asicid = readl(__io_address(U8500_ASIC_ID_LOC_ED_V1));
102	else if (cpu_is_u8500v2())
103		asicid = readl(__io_address(U8500_ASIC_ID_LOC_V2));
104	else
105		BUG();
106
107	db8500_id.process = (asicid >> 24);
108	db8500_id.partnumber = (asicid >> 16) & 0xFFFFU;
109	db8500_id.revision = asicid & 0xFFU;
110}
111
112bool cpu_is_u8500v10(void)
113{
114	return (db8500_id.revision == U8500_ASIC_REV_V10);
115}
116
117bool cpu_is_u8500v11(void)
118{
119	return (db8500_id.revision == U8500_ASIC_REV_V11);
120}
121
122bool cpu_is_u8500v20(void)
123{
124	return (db8500_id.revision == U8500_ASIC_REV_V20);
125}
126
127void __init u8500_map_io(void)
128{
129	ux500_map_io();
130
131	iotable_init(u8500_io_desc, ARRAY_SIZE(u8500_io_desc));
132
133	if (cpu_is_u8500ed())
134		iotable_init(u8500_ed_io_desc, ARRAY_SIZE(u8500_ed_io_desc));
135	else if (cpu_is_u8500v1())
136		iotable_init(u8500_v1_io_desc, ARRAY_SIZE(u8500_v1_io_desc));
137	else if (cpu_is_u8500v2())
138		iotable_init(u8500_v2_io_desc, ARRAY_SIZE(u8500_v2_io_desc));
139
140	/* Read out the ASIC ID as early as we can */
141	get_db8500_asic_id();
142}
143
144/*
145 * This function is called from the board init
146 */
147void __init u8500_init_devices(void)
148{
149	/* Display some ASIC boilerplate */
150	pr_info("DB8500: process: %02x, revision ID: 0x%02x\n",
151		db8500_id.process, db8500_id.revision);
152	if (cpu_is_u8500ed())
153		pr_info("DB8500: Early Drop (ED)\n");
154	else if (cpu_is_u8500v10())
155		pr_info("DB8500: version 1.0\n");
156	else if (cpu_is_u8500v11())
157		pr_info("DB8500: version 1.1\n");
158	else if (cpu_is_u8500v20())
159		pr_info("DB8500: version 2.0\n");
160	else
161		pr_warning("ASIC: UNKNOWN SILICON VERSION!\n");
162
163	if (cpu_is_u8500ed())
164		dma40_u8500ed_fixup();
165
166	db8500_add_rtc();
167
168	platform_add_devices(platform_devs, ARRAY_SIZE(platform_devs));
169
170	return ;
171}
172