1 files changed, 244 insertions, 0 deletions
diff --git a/cpu/arm926ejs/cpuinfo.c b/cpu/arm926ejs/cpuinfo.c
new file mode 100644
index 0000000..8c98631
--- /dev/null
+++ b/cpu/arm926ejs/cpuinfo.c
@@ -0,0 +1,244 @@
+/*
+ * OMAP1 CPU identification code
+ *
+ * Copyright (C) 2004 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 <common.h>
+#include <command.h>
+#include <arm926ejs.h>
+
+#if defined(CONFIG_DISPLAY_CPUINFO) && defined(CONFIG_OMAP)
+
+#define omap_readw(x)		*(volatile unsigned short *)(x)
+#define omap_readl(x)		*(volatile unsigned long *)(x)
+
+#define ARRAY_SIZE(x)		(sizeof(x) / sizeof((x)[0]))
+
+#define OMAP_DIE_ID_0		0xfffe1800
+#define OMAP_DIE_ID_1		0xfffe1804
+#define OMAP_PRODUCTION_ID_0	0xfffe2000
+#define OMAP_PRODUCTION_ID_1	0xfffe2004
+#define OMAP32_ID_0		0xfffed400
+#define OMAP32_ID_1		0xfffed404
+
+struct omap_id {
+	u16	jtag_id;	/* Used to determine OMAP type */
+	u8	die_rev;	/* Processor revision */
+	u32	omap_id;	/* OMAP revision */
+	u32	type;		/* Cpu id bits [31:08], cpu class bits [07:00] */
+};
+
+/* Register values to detect the OMAP version */
+static struct omap_id omap_ids[] = {
+	{ .jtag_id = 0xb574, .die_rev = 0x2, .omap_id = 0x03310315, .type = 0x03100000},
+	{ .jtag_id = 0x355f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300100},
+	{ .jtag_id = 0xb55f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300300},
+	{ .jtag_id = 0xb470, .die_rev = 0x0, .omap_id = 0x03310100, .type = 0x15100000},
+	{ .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x16100000},
+	{ .jtag_id = 0xb576, .die_rev = 0x2, .omap_id = 0x03320100, .type = 0x16110000},
+	{ .jtag_id = 0xb576, .die_rev = 0x3, .omap_id = 0x03320100, .type = 0x16100c00},
+	{ .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320200, .type = 0x16100d00},
+	{ .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
+	{ .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
+	{ .jtag_id = 0xb576, .die_rev = 0x1, .omap_id = 0x03320100, .type = 0x16110000},
+	{ .jtag_id = 0xb58c, .die_rev = 0x2, .omap_id = 0x03320200, .type = 0x16110b00},
+	{ .jtag_id = 0xb58c, .die_rev = 0x3, .omap_id = 0x03320200, .type = 0x16110c00},
+	{ .jtag_id = 0xb65f, .die_rev = 0x0, .omap_id = 0x03320400, .type = 0x16212300},
+	{ .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320400, .type = 0x16212300},
+	{ .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320500, .type = 0x16212300},
+	{ .jtag_id = 0xb5f7, .die_rev = 0x0, .omap_id = 0x03330000, .type = 0x17100000},
+	{ .jtag_id = 0xb5f7, .die_rev = 0x1, .omap_id = 0x03330100, .type = 0x17100000},
+	{ .jtag_id = 0xb5f7, .die_rev = 0x2, .omap_id = 0x03330100, .type = 0x17100000},
+};
+
+/*
+ * Get OMAP type from PROD_ID.
+ * 1710 has the PROD_ID in bits 15:00, not in 16:01 as documented in TRM.
+ * 1510 PROD_ID is empty, and 1610 PROD_ID does not make sense.
+ * Undocumented register in TEST BLOCK is used as fallback; This seems to
+ * work on 1510, 1610 & 1710. The official way hopefully will work in future
+ * processors.
+ */
+static u16 omap_get_jtag_id(void)
+{
+	u32 prod_id, omap_id;
+
+	prod_id = omap_readl(OMAP_PRODUCTION_ID_1);
+	omap_id = omap_readl(OMAP32_ID_1);
+
+	/* Check for unusable OMAP_PRODUCTION_ID_1 on 1611B/5912 and 730 */
+	if (((prod_id >> 20) == 0) || (prod_id == omap_id))
+		prod_id = 0;
+	else
+		prod_id &= 0xffff;
+
+	if (prod_id)
+		return prod_id;
+
+	/* Use OMAP32_ID_1 as fallback */
+	prod_id = ((omap_id >> 12) & 0xffff);
+
+	return prod_id;
+}
+
+/*
+ * Get OMAP revision from DIE_REV.
+ * Early 1710 processors may have broken OMAP_DIE_ID, it contains PROD_ID.
+ * Undocumented register in the TEST BLOCK is used as fallback.
+ * REVISIT: This does not seem to work on 1510
+ */
+static u8 omap_get_die_rev(void)
+{
+	u32 die_rev;
+
+	die_rev = omap_readl(OMAP_DIE_ID_1);
+
+	/* Check for broken OMAP_DIE_ID on early 1710 */
+	if (((die_rev >> 12) & 0xffff) == omap_get_jtag_id())
+		die_rev = 0;
+
+	die_rev = (die_rev >> 17) & 0xf;
+	if (die_rev)
+		return die_rev;
+
+	die_rev = (omap_readl(OMAP32_ID_1) >> 28) & 0xf;
+
+	return die_rev;
+}
+
+static unsigned long dpll1(void)
+{
+	unsigned short pll_ctl_val = omap_readw(DPLL_CTL_REG);
+	unsigned long rate;
+
+	rate = CONFIG_SYS_CLK_FREQ; /* Base xtal rate */
+	if (pll_ctl_val & 0x10) {
+		/* PLL enabled, apply multiplier and divisor */
+		if (pll_ctl_val & 0xf80)
+			rate *= (pll_ctl_val & 0xf80) >> 7;
+		rate /= ((pll_ctl_val & 0x60) >> 5) + 1;
+	} else {
+		/* PLL disabled, apply bypass divisor */
+		switch (pll_ctl_val & 0xc) {
+		case 0:
+			break;
+		case 0x4:
+			rate /= 2;
+			break;
+		default:
+			rate /= 4;
+			break;
+		}
+	}
+
+	return rate;
+}
+
+static unsigned long armcore(void)
+{
+	unsigned short arm_ckctl = omap_readw(ARM_CKCTL);
+
+	return (dpll1() >> ((arm_ckctl & 0x0030) >> 4));
+}
+
+int print_cpuinfo (void)
+{
+	int i;
+	u16 jtag_id;
+	u8 die_rev;
+	u32 omap_id;
+	u8 cpu_type;
+	u32 system_serial_high;
+	u32 system_serial_low;
+	u32 system_rev = 0;
+
+	jtag_id = omap_get_jtag_id();
+	die_rev = omap_get_die_rev();
+	omap_id = omap_readl(OMAP32_ID_0);
+
+#ifdef DEBUG
+	printf("OMAP_DIE_ID_0: 0x%08x\n", omap_readl(OMAP_DIE_ID_0));
+	printf("OMAP_DIE_ID_1: 0x%08x DIE_REV: %i\n",
+	       omap_readl(OMAP_DIE_ID_1),
+	       (omap_readl(OMAP_DIE_ID_1) >> 17) & 0xf);
+	printf("OMAP_PRODUCTION_ID_0: 0x%08x\n", omap_readl(OMAP_PRODUCTION_ID_0));
+	printf("OMAP_PRODUCTION_ID_1: 0x%08x JTAG_ID: 0x%04x\n",
+	       omap_readl(OMAP_PRODUCTION_ID_1),
+	       omap_readl(OMAP_PRODUCTION_ID_1) & 0xffff);
+	printf("OMAP32_ID_0: 0x%08x\n", omap_readl(OMAP32_ID_0));
+	printf("OMAP32_ID_1: 0x%08x\n", omap_readl(OMAP32_ID_1));
+	printf("JTAG_ID: 0x%04x DIE_REV: %i\n", jtag_id, die_rev);
+#endif
+
+	system_serial_high = omap_readl(OMAP_DIE_ID_0);
+	system_serial_low = omap_readl(OMAP_DIE_ID_1);
+
+	/* First check only the major version in a safe way */
+	for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
+		if (jtag_id == (omap_ids[i].jtag_id)) {
+			system_rev = omap_ids[i].type;
+			break;
+		}
+	}
+
+	/* Check if we can find the die revision */
+	for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
+		if (jtag_id == omap_ids[i].jtag_id && die_rev == omap_ids[i].die_rev) {
+			system_rev = omap_ids[i].type;
+			break;
+		}
+	}
+
+	/* Finally check also the omap_id */
+	for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
+		if (jtag_id == omap_ids[i].jtag_id
+		    && die_rev == omap_ids[i].die_rev
+		    && omap_id == omap_ids[i].omap_id) {
+			system_rev = omap_ids[i].type;
+			break;
+		}
+	}
+
+	/* Add the cpu class info (7xx, 15xx, 16xx, 24xx) */
+	cpu_type = system_rev >> 24;
+
+	switch (cpu_type) {
+	case 0x07:
+		system_rev |= 0x07;
+		break;
+	case 0x03:
+	case 0x15:
+		system_rev |= 0x15;
+		break;
+	case 0x16:
+	case 0x17:
+		system_rev |= 0x16;
+		break;
+	case 0x24:
+		system_rev |= 0x24;
+		break;
+	default:
+		printf("Unknown OMAP cpu type: 0x%02x\n", cpu_type);
+	}
+
+	printf("CPU:   OMAP%04x", system_rev >> 16);
+	if ((system_rev >> 8) & 0xff)
+		printf("%x", (system_rev >> 8) & 0xff);
+#ifdef DEBUG
+	printf(" revision %i handled as %02xxx id: %08x%08x",
+	       die_rev, system_rev & 0xff, system_serial_low, system_serial_high);
+#endif
+	printf(" at %ld.%01ld MHz (DPLL1=%ld.%01ld MHz)\n",
+	       armcore() / 1000000, (armcore() / 100000) % 10,
+	       dpll1() / 1000000, (dpll1() / 100000) % 10);
+
+	return 0;
+}
+
+#endif /* #if defined(CONFIG_DISPLAY_CPUINFO) && defined(CONFIG_OMAP) */