1 files changed, 124 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/id.c b/arch/arm/mach-omap2/id.c
new file mode 100644
index 000000000000..76187300f2b6
--- /dev/null
+++ b/arch/arm/mach-omap2/id.c
@@ -0,0 +1,124 @@
+/*
+ * 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");
+}
+