2 * Copyright (C) 2008-2009 ST-Ericsson
4 * Author: Srinidhi KASAGAR <srinidhi.kasagar@stericsson.com>
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.
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>
20 #include <asm/mach/map.h>
21 #include <mach/hardware.h>
22 #include <mach/setup.h>
23 #include <mach/devices.h>
25 static struct platform_device *platform_devs[] __initdata = {
38 /* minimum static i/o mapping required to boot U8500 platforms */
39 static struct map_desc u8500_io_desc[] __initdata = {
40 __IO_DEV_DESC(U8500_PRCMU_BASE, SZ_4K),
41 __IO_DEV_DESC(U8500_PRCMU_TCDM_BASE, SZ_4K),
42 __IO_DEV_DESC(U8500_GPIO0_BASE, SZ_4K),
43 __IO_DEV_DESC(U8500_GPIO1_BASE, SZ_4K),
44 __IO_DEV_DESC(U8500_GPIO2_BASE, SZ_4K),
45 __IO_DEV_DESC(U8500_GPIO3_BASE, SZ_4K),
46 __MEM_DEV_DESC(U8500_BOOT_ROM_BASE, SZ_1M),
49 static struct map_desc u8500ed_io_desc[] __initdata = {
50 __IO_DEV_DESC(U8500_MTU0_BASE_ED, SZ_4K),
51 __IO_DEV_DESC(U8500_CLKRST7_BASE_ED, SZ_8K),
54 static struct map_desc u8500v1_io_desc[] __initdata = {
55 __IO_DEV_DESC(U8500_MTU0_BASE, SZ_4K),
59 * Functions to differentiate between later ASICs
60 * We look into the end of the ROM to locate the hardcoded ASIC ID.
61 * This is only needed to differentiate between minor revisions and
62 * process variants of an ASIC, the major revisions are encoded in
65 #define U8500_ASIC_ID_LOC_ED_V1 (U8500_BOOT_ROM_BASE + 0x1FFF4)
66 #define U8500_ASIC_ID_LOC_V2 (U8500_BOOT_ROM_BASE + 0x1DBF4)
67 #define U8500_ASIC_REV_ED 0x01
68 #define U8500_ASIC_REV_V10 0xA0
69 #define U8500_ASIC_REV_V11 0xA1
70 #define U8500_ASIC_REV_V20 0xB0
73 * struct db8500_asic_id - fields of the ASIC ID
74 * @process: the manufacturing process, 0x40 is 40 nm
76 * @partnumber: hithereto 0x8500 for DB8500
77 * @revision: version code in the series
78 * This field definion is not formally defined but makes
81 struct db8500_asic_id {
87 /* This isn't going to change at runtime */
88 static struct db8500_asic_id db8500_id;
90 static void __init get_db8500_asic_id(void)
94 if (cpu_is_u8500v1() || cpu_is_u8500ed())
95 asicid = readl(__io_address(U8500_ASIC_ID_LOC_ED_V1));
96 else if (cpu_is_u8500v2())
97 asicid = readl(__io_address(U8500_ASIC_ID_LOC_V2));
101 db8500_id.process = (asicid >> 24);
102 db8500_id.partnumber = (asicid >> 16) & 0xFFFFU;
103 db8500_id.revision = asicid & 0xFFU;
106 bool cpu_is_u8500v10(void)
108 return (db8500_id.revision == U8500_ASIC_REV_V10);
111 bool cpu_is_u8500v11(void)
113 return (db8500_id.revision == U8500_ASIC_REV_V11);
116 bool cpu_is_u8500v20(void)
118 return (db8500_id.revision == U8500_ASIC_REV_V20);
121 void __init u8500_map_io(void)
125 iotable_init(u8500_io_desc, ARRAY_SIZE(u8500_io_desc));
127 if (cpu_is_u8500ed())
128 iotable_init(u8500ed_io_desc, ARRAY_SIZE(u8500ed_io_desc));
130 iotable_init(u8500v1_io_desc, ARRAY_SIZE(u8500v1_io_desc));
132 /* Read out the ASIC ID as early as we can */
133 get_db8500_asic_id();
137 * This function is called from the board init
139 void __init u8500_init_devices(void)
141 /* Display some ASIC boilerplate */
142 pr_info("DB8500: process: %02x, revision ID: 0x%02x\n",
143 db8500_id.process, db8500_id.revision);
144 if (cpu_is_u8500ed())
145 pr_info("DB8500: Early Drop (ED)\n");
146 else if (cpu_is_u8500v10())
147 pr_info("DB8500: version 1.0\n");
148 else if (cpu_is_u8500v11())
149 pr_info("DB8500: version 1.1\n");
150 else if (cpu_is_u8500v20())
151 pr_info("DB8500: version 2.0\n");
153 pr_warning("ASIC: UNKNOWN SILICON VERSION!\n");
155 ux500_init_devices();
157 if (cpu_is_u8500ed())
158 dma40_u8500ed_fixup();
160 /* Register the platform devices */
161 platform_add_devices(platform_devs, ARRAY_SIZE(platform_devs));