id.c 6.2 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * linux/arch/arm/mach-omap1/id.c
  4. *
  5. * OMAP1 CPU identification code
  6. *
  7. * Copyright (C) 2004 Nokia Corporation
  8. * Written by Tony Lindgren <[email protected]>
  9. */
  10. #include <linux/module.h>
  11. #include <linux/kernel.h>
  12. #include <linux/init.h>
  13. #include <linux/io.h>
  14. #include <linux/soc/ti/omap1-io.h>
  15. #include <asm/system_info.h>
  16. #include "soc.h"
  17. #include "hardware.h"
  18. #include "common.h"
  19. #define OMAP_DIE_ID_0 0xfffe1800
  20. #define OMAP_DIE_ID_1 0xfffe1804
  21. #define OMAP_PRODUCTION_ID_0 0xfffe2000
  22. #define OMAP_PRODUCTION_ID_1 0xfffe2004
  23. #define OMAP32_ID_0 0xfffed400
  24. #define OMAP32_ID_1 0xfffed404
  25. struct omap_id {
  26. u16 jtag_id; /* Used to determine OMAP type */
  27. u8 die_rev; /* Processor revision */
  28. u32 omap_id; /* OMAP revision */
  29. u32 type; /* Cpu id bits [31:08], cpu class bits [07:00] */
  30. };
  31. static unsigned int omap_revision;
  32. /* Register values to detect the OMAP version */
  33. static struct omap_id omap_ids[] __initdata = {
  34. { .jtag_id = 0xb574, .die_rev = 0x2, .omap_id = 0x03310315, .type = 0x03100000},
  35. { .jtag_id = 0x355f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300100},
  36. { .jtag_id = 0xb55f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300300},
  37. { .jtag_id = 0xb62c, .die_rev = 0x1, .omap_id = 0x03320500, .type = 0x08500000},
  38. { .jtag_id = 0xb470, .die_rev = 0x0, .omap_id = 0x03310100, .type = 0x15100000},
  39. { .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x16100000},
  40. { .jtag_id = 0xb576, .die_rev = 0x2, .omap_id = 0x03320100, .type = 0x16110000},
  41. { .jtag_id = 0xb576, .die_rev = 0x3, .omap_id = 0x03320100, .type = 0x16100c00},
  42. { .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320200, .type = 0x16100d00},
  43. { .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
  44. { .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
  45. { .jtag_id = 0xb576, .die_rev = 0x1, .omap_id = 0x03320100, .type = 0x16110000},
  46. { .jtag_id = 0xb58c, .die_rev = 0x2, .omap_id = 0x03320200, .type = 0x16110b00},
  47. { .jtag_id = 0xb58c, .die_rev = 0x3, .omap_id = 0x03320200, .type = 0x16110c00},
  48. { .jtag_id = 0xb65f, .die_rev = 0x0, .omap_id = 0x03320400, .type = 0x16212300},
  49. { .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320400, .type = 0x16212300},
  50. { .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320500, .type = 0x16212300},
  51. { .jtag_id = 0xb5f7, .die_rev = 0x0, .omap_id = 0x03330000, .type = 0x17100000},
  52. { .jtag_id = 0xb5f7, .die_rev = 0x1, .omap_id = 0x03330100, .type = 0x17100000},
  53. { .jtag_id = 0xb5f7, .die_rev = 0x2, .omap_id = 0x03330100, .type = 0x17100000},
  54. };
  55. unsigned int omap_rev(void)
  56. {
  57. return omap_revision;
  58. }
  59. EXPORT_SYMBOL(omap_rev);
  60. /*
  61. * Get OMAP type from PROD_ID.
  62. * 1710 has the PROD_ID in bits 15:00, not in 16:01 as documented in TRM.
  63. * 1510 PROD_ID is empty, and 1610 PROD_ID does not make sense.
  64. * Undocumented register in TEST BLOCK is used as fallback; This seems to
  65. * work on 1510, 1610 & 1710. The official way hopefully will work in future
  66. * processors.
  67. */
  68. static u16 __init omap_get_jtag_id(void)
  69. {
  70. u32 prod_id, omap_id;
  71. prod_id = omap_readl(OMAP_PRODUCTION_ID_1);
  72. omap_id = omap_readl(OMAP32_ID_1);
  73. /* Check for unusable OMAP_PRODUCTION_ID_1 on 1611B/5912 and 730/850 */
  74. if (((prod_id >> 20) == 0) || (prod_id == omap_id))
  75. prod_id = 0;
  76. else
  77. prod_id &= 0xffff;
  78. if (prod_id)
  79. return prod_id;
  80. /* Use OMAP32_ID_1 as fallback */
  81. prod_id = ((omap_id >> 12) & 0xffff);
  82. return prod_id;
  83. }
  84. /*
  85. * Get OMAP revision from DIE_REV.
  86. * Early 1710 processors may have broken OMAP_DIE_ID, it contains PROD_ID.
  87. * Undocumented register in the TEST BLOCK is used as fallback.
  88. * REVISIT: This does not seem to work on 1510
  89. */
  90. static u8 __init omap_get_die_rev(void)
  91. {
  92. u32 die_rev;
  93. die_rev = omap_readl(OMAP_DIE_ID_1);
  94. /* Check for broken OMAP_DIE_ID on early 1710 */
  95. if (((die_rev >> 12) & 0xffff) == omap_get_jtag_id())
  96. die_rev = 0;
  97. die_rev = (die_rev >> 17) & 0xf;
  98. if (die_rev)
  99. return die_rev;
  100. die_rev = (omap_readl(OMAP32_ID_1) >> 28) & 0xf;
  101. return die_rev;
  102. }
  103. void __init omap_check_revision(void)
  104. {
  105. int i;
  106. u16 jtag_id;
  107. u8 die_rev;
  108. u32 omap_id;
  109. u8 cpu_type;
  110. jtag_id = omap_get_jtag_id();
  111. die_rev = omap_get_die_rev();
  112. omap_id = omap_readl(OMAP32_ID_0);
  113. #ifdef DEBUG
  114. printk(KERN_DEBUG "OMAP_DIE_ID_0: 0x%08x\n", omap_readl(OMAP_DIE_ID_0));
  115. printk(KERN_DEBUG "OMAP_DIE_ID_1: 0x%08x DIE_REV: %i\n",
  116. omap_readl(OMAP_DIE_ID_1),
  117. (omap_readl(OMAP_DIE_ID_1) >> 17) & 0xf);
  118. printk(KERN_DEBUG "OMAP_PRODUCTION_ID_0: 0x%08x\n",
  119. omap_readl(OMAP_PRODUCTION_ID_0));
  120. printk(KERN_DEBUG "OMAP_PRODUCTION_ID_1: 0x%08x JTAG_ID: 0x%04x\n",
  121. omap_readl(OMAP_PRODUCTION_ID_1),
  122. omap_readl(OMAP_PRODUCTION_ID_1) & 0xffff);
  123. printk(KERN_DEBUG "OMAP32_ID_0: 0x%08x\n", omap_readl(OMAP32_ID_0));
  124. printk(KERN_DEBUG "OMAP32_ID_1: 0x%08x\n", omap_readl(OMAP32_ID_1));
  125. printk(KERN_DEBUG "JTAG_ID: 0x%04x DIE_REV: %i\n", jtag_id, die_rev);
  126. #endif
  127. system_serial_high = omap_readl(OMAP_DIE_ID_0);
  128. system_serial_low = omap_readl(OMAP_DIE_ID_1);
  129. /* First check only the major version in a safe way */
  130. for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
  131. if (jtag_id == (omap_ids[i].jtag_id)) {
  132. omap_revision = omap_ids[i].type;
  133. break;
  134. }
  135. }
  136. /* Check if we can find the die revision */
  137. for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
  138. if (jtag_id == omap_ids[i].jtag_id && die_rev == omap_ids[i].die_rev) {
  139. omap_revision = omap_ids[i].type;
  140. break;
  141. }
  142. }
  143. /* Finally check also the omap_id */
  144. for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
  145. if (jtag_id == omap_ids[i].jtag_id
  146. && die_rev == omap_ids[i].die_rev
  147. && omap_id == omap_ids[i].omap_id) {
  148. omap_revision = omap_ids[i].type;
  149. break;
  150. }
  151. }
  152. /* Add the cpu class info (7xx, 15xx, 16xx, 24xx) */
  153. cpu_type = omap_revision >> 24;
  154. switch (cpu_type) {
  155. case 0x07:
  156. case 0x08:
  157. omap_revision |= 0x07;
  158. break;
  159. case 0x03:
  160. case 0x15:
  161. omap_revision |= 0x15;
  162. break;
  163. case 0x16:
  164. case 0x17:
  165. omap_revision |= 0x16;
  166. break;
  167. default:
  168. printk(KERN_INFO "Unknown OMAP cpu type: 0x%02x\n", cpu_type);
  169. }
  170. pr_info("OMAP%04x", omap_revision >> 16);
  171. if ((omap_revision >> 8) & 0xff)
  172. pr_cont("%x", (omap_revision >> 8) & 0xff);
  173. pr_cont(" revision %i handled as %02xxx id: %08x%08x\n",
  174. die_rev, omap_revision & 0xff, system_serial_low,
  175. system_serial_high);
  176. }