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-rw-r--r--arch/arm/mach-omap2/id.c124
1 files changed, 124 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/id.c b/arch/arm/mach-omap2/id.c
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+++ b/arch/arm/mach-omap2/id.c
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+/*
+ * linux/arch/arm/mach-omap2/id.c
+ *
+ * OMAP2 CPU identification code
+ *
+ * Copyright (C) 2005 Nokia Corporation
+ * Written by Tony Lindgren <tony@atomide.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+
+#include <asm/io.h>
+
+#define OMAP24XX_TAP_BASE io_p2v(0x48014000)
+
+#define OMAP_TAP_IDCODE 0x0204
+#define OMAP_TAP_PROD_ID 0x0208
+
+#define OMAP_TAP_DIE_ID_0 0x0218
+#define OMAP_TAP_DIE_ID_1 0x021C
+#define OMAP_TAP_DIE_ID_2 0x0220
+#define OMAP_TAP_DIE_ID_3 0x0224
+
+/* system_rev fields for OMAP2 processors:
+ * CPU id bits [31:16],
+ * CPU device type [15:12], (unprg,normal,POP)
+ * CPU revision [11:08]
+ * CPU class bits [07:00]
+ */
+
+struct omap_id {
+ u16 hawkeye; /* Silicon type (Hawkeye id) */
+ u8 dev; /* Device type from production_id reg */
+ u32 type; /* combined type id copied to system_rev */
+};
+
+/* Register values to detect the OMAP version */
+static struct omap_id omap_ids[] __initdata = {
+ { .hawkeye = 0xb5d9, .dev = 0x0, .type = 0x24200000 },
+ { .hawkeye = 0xb5d9, .dev = 0x1, .type = 0x24201000 },
+ { .hawkeye = 0xb5d9, .dev = 0x2, .type = 0x24202000 },
+ { .hawkeye = 0xb5d9, .dev = 0x4, .type = 0x24220000 },
+ { .hawkeye = 0xb5d9, .dev = 0x8, .type = 0x24230000 },
+ { .hawkeye = 0xb68a, .dev = 0x0, .type = 0x24300000 },
+};
+
+static u32 __init read_tap_reg(int reg)
+{
+ return __raw_readl(OMAP24XX_TAP_BASE + reg);
+}
+
+void __init omap2_check_revision(void)
+{
+ int i, j;
+ u32 idcode;
+ u32 prod_id;
+ u16 hawkeye;
+ u8 dev_type;
+ u8 rev;
+
+ idcode = read_tap_reg(OMAP_TAP_IDCODE);
+ prod_id = read_tap_reg(OMAP_TAP_PROD_ID);
+ hawkeye = (idcode >> 12) & 0xffff;
+ rev = (idcode >> 28) & 0x0f;
+ dev_type = (prod_id >> 16) & 0x0f;
+
+#ifdef DEBUG
+ printk(KERN_DEBUG "OMAP_TAP_IDCODE 0x%08x REV %i HAWKEYE 0x%04x MANF %03x\n",
+ idcode, rev, hawkeye, (idcode >> 1) & 0x7ff);
+ printk(KERN_DEBUG "OMAP_TAP_DIE_ID_0: 0x%08x\n",
+ read_tap_reg(OMAP_TAP_DIE_ID_0));
+ printk(KERN_DEBUG "OMAP_TAP_DIE_ID_1: 0x%08x DEV_REV: %i\n",
+ read_tap_reg(OMAP_TAP_DIE_ID_1),
+ (read_tap_reg(OMAP_TAP_DIE_ID_1) >> 28) & 0xf);
+ printk(KERN_DEBUG "OMAP_TAP_DIE_ID_2: 0x%08x\n",
+ read_tap_reg(OMAP_TAP_DIE_ID_2));
+ printk(KERN_DEBUG "OMAP_TAP_DIE_ID_3: 0x%08x\n",
+ read_tap_reg(OMAP_TAP_DIE_ID_3));
+ printk(KERN_DEBUG "OMAP_TAP_PROD_ID_0: 0x%08x DEV_TYPE: %i\n",
+ prod_id, dev_type);
+#endif
+
+ /* Check hawkeye ids */
+ for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
+ if (hawkeye == omap_ids[i].hawkeye)
+ break;
+ }
+
+ if (i == ARRAY_SIZE(omap_ids)) {
+ printk(KERN_ERR "Unknown OMAP CPU id\n");
+ return;
+ }
+
+ for (j = i; j < ARRAY_SIZE(omap_ids); j++) {
+ if (dev_type == omap_ids[j].dev)
+ break;
+ }
+
+ if (j == ARRAY_SIZE(omap_ids)) {
+ printk(KERN_ERR "Unknown OMAP device type. "
+ "Handling it as OMAP%04x\n",
+ omap_ids[i].type >> 16);
+ j = i;
+ }
+ system_rev = omap_ids[j].type;
+
+ system_rev |= rev << 8;
+
+ /* Add the cpu class info (24xx) */
+ system_rev |= 0x24;
+
+ pr_info("OMAP%04x", system_rev >> 16);
+ if ((system_rev >> 8) & 0x0f)
+ printk("%x", (system_rev >> 8) & 0x0f);
+ printk("\n");
+}
+