Linux Kernel  3.7.1
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id.c
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1 /*
2  * Copyright (C) ST-Ericsson SA 2010
3  *
4  * Author: Rabin Vincent <[email protected]> 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 <mach/hardware.h>
18 #include <mach/setup.h>
19 
21 
22 static unsigned int ux500_read_asicid(phys_addr_t addr)
23 {
24  phys_addr_t base = addr & ~0xfff;
25  struct map_desc desc = {
26  .virtual = UX500_VIRT_ROM,
27  .pfn = __phys_to_pfn(base),
28  .length = SZ_16K,
29  .type = MT_DEVICE,
30  };
31 
32  iotable_init(&desc, 1);
33 
34  /* As in devicemaps_init() */
37 
38  return readl(IOMEM(UX500_VIRT_ROM + (addr & 0xfff)));
39 }
40 
41 static void ux500_print_soc_info(unsigned int asicid)
42 {
43  unsigned int rev = dbx500_revision();
44 
45  pr_info("DB%4x ", dbx500_partnumber());
46 
47  if (rev == 0x01)
48  pr_cont("Early Drop");
49  else if (rev >= 0xA0)
50  pr_cont("v%d.%d" , (rev >> 4) - 0xA + 1, rev & 0xf);
51  else
52  pr_cont("Unknown");
53 
54  pr_cont(" [%#010x]\n", asicid);
55 }
56 
57 static unsigned int partnumber(unsigned int asicid)
58 {
59  return (asicid >> 8) & 0xffff;
60 }
61 
62 /*
63  * SOC MIDR ASICID ADDRESS ASICID VALUE
64  * DB8500ed 0x410fc090 0x9001FFF4 0x00850001
65  * DB8500v1 0x411fc091 0x9001FFF4 0x008500A0
66  * DB8500v1.1 0x411fc091 0x9001FFF4 0x008500A1
67  * DB8500v2 0x412fc091 0x9001DBF4 0x008500B0
68  * DB8520v2.2 0x412fc091 0x9001DBF4 0x008500B2
69  * DB5500v1 0x412fc091 0x9001FFF4 0x005500A0
70  * DB9540 0x413fc090 0xFFFFDBF4 0x009540xx
71  */
72 
73 void __init ux500_map_io(void)
74 {
75  unsigned int cpuid = read_cpuid_id();
76  unsigned int asicid = 0;
77  phys_addr_t addr = 0;
78 
79  switch (cpuid) {
80  case 0x410fc090: /* DB8500ed */
81  case 0x411fc091: /* DB8500v1 */
82  addr = 0x9001FFF4;
83  break;
84 
85  case 0x412fc091: /* DB8520 / DB8500v2 / DB5500v1 */
86  asicid = ux500_read_asicid(0x9001DBF4);
87  if (partnumber(asicid) == 0x8500 ||
88  partnumber(asicid) == 0x8520)
89  /* DB8500v2 */
90  break;
91 
92  /* DB5500v1 */
93  addr = 0x9001FFF4;
94  break;
95 
96  case 0x413fc090: /* DB9540 */
97  addr = 0xFFFFDBF4;
98  break;
99  }
100 
101  if (addr)
102  asicid = ux500_read_asicid(addr);
103 
104  if (!asicid) {
105  pr_err("Unable to identify SoC\n");
107  }
108 
109  dbx500_id.process = asicid >> 24;
110  dbx500_id.partnumber = partnumber(asicid);
111  dbx500_id.revision = asicid & 0xff;
112 
113  ux500_print_soc_info(asicid);
114 }