[ARM PATCH] 2162/1: OMAP update 1/8: Improved cpu detection and serial init

Patch from Tony Lindgren

This patch improves the OMAP cpu detection during the boot,
and adds board-specific init for the serial ports.

Signed-off-by: Tony Lindgren

arch/arm/mach-omap/common.c

@@ -14,65 +14,194 @@
 #include <linux/delay.h>
 #include <linux/pm.h>
 #include <linux/console.h>
+#include <linux/serial.h>
+#include <linux/tty.h>
+#include <linux/serial_core.h>
 
 #include <asm/hardware.h>
 #include <asm/system.h>
 #include <asm/pgtable.h>
 #include <asm/mach/map.h>
-#include <asm/arch/clocks.h>
-#include <asm/arch/board.h>
+#include <asm/hardware/clock.h>
 #include <asm/io.h>
+#include <asm/mach-types.h>
+
+#include <asm/arch/board.h>
+#include <asm/arch/mux.h>
+#include <asm/arch/fpga.h>
+#include <asm/arch/serial.h>
+
+
+#include "clock.h"
+
+#define DEBUG 1
+
+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[] __initdata = {
+	{ .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},
+};
 
 /*
- * ----------------------------------------------------------------------------
- * OMAP revision check
- *
- * Since we use the cpu_is_omapnnnn() macros, there's a chance that a board
- * switches to an updated core. We want to print out the OMAP revision early.
- *
- * We use the system_serial registers for the revision information so we
- * can see it in /proc/cpuinfo.
- *
- * If the OMAP detection gets more complicated, we may want to expand this
- * to store the OMAP version and replace the current cpu_is_omapnnnn() macros.
- *
- * ----------------------------------------------------------------------------
+ * 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 __init 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 __init 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 void __init omap_check_revision(void)
 {
-	system_serial_high = omap_readl(OMAP_ID_BASE);
-	system_serial_low = OMAP_ID_REG;
-	system_rev = (OMAP_ID_REG >> ID_SHIFT) & ID_MASK;
-
-	printk("OMAP revision: %d.%d (0x%08x) id: 0x%08x detected as OMAP-",
-	       (system_serial_high >> 20) & 0xf,
-	       (system_serial_high >> 16) & 0xf,
-	       system_serial_high, system_serial_low);
-
-	switch (system_rev) {
-	case OMAP_ID_730:
-		printk("730\n");
-		system_rev = 0x730;
-		break;
-	case OMAP_ID_1510:
-		printk("1510\n");
-		system_rev = 0x1510;
+	int i;
+	u16 jtag_id;
+	u8 die_rev;
+	u32 omap_id;
+	u8 cpu_type;
+
+	jtag_id = omap_get_jtag_id();
+	die_rev = omap_get_die_rev();
+	omap_id = omap_readl(OMAP32_ID_0);
+
+#ifdef DEBUG
+	printk("OMAP_DIE_ID_0: 0x%08x\n", omap_readl(OMAP_DIE_ID_0));
+	printk("OMAP_DIE_ID_1: 0x%08x DIE_REV: %i\n",
+		omap_readl(OMAP_DIE_ID_1),
+	       (omap_readl(OMAP_DIE_ID_1) >> 17) & 0xf);
+	printk("OMAP_PRODUCTION_ID_0: 0x%08x\n", omap_readl(OMAP_PRODUCTION_ID_0));
+	printk("OMAP_PRODUCTION_ID_1: 0x%08x JTAG_ID: 0x%04x\n",
+		omap_readl(OMAP_PRODUCTION_ID_1),
+		omap_readl(OMAP_PRODUCTION_ID_1) & 0xffff);
+	printk("OMAP32_ID_0: 0x%08x\n", omap_readl(OMAP32_ID_0));
+	printk("OMAP32_ID_1: 0x%08x\n", omap_readl(OMAP32_ID_1));
+	printk("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 OMAP_ID_1610:
-		printk("1610\n");
-		system_rev = 0x1610;
+	case 0x15:
+		system_rev |= 0x15;
 		break;
-	case OMAP_ID_1710:
-		printk("1710\n");
-		system_rev = 0x1710;
+	case 0x16:
+	case 0x17:
+		system_rev |= 0x16;
 		break;
-	case OMAP_ID_5912:
-		printk("5912/1611B\n");
-		system_rev = 0x5912;
+	case 0x24:
+		system_rev |= 0x24;
 		break;
 	default:
-		printk("unknown, please add support!\n");
+		printk("Unknown OMAP cpu type: 0x%02x\n", cpu_type);
 	}
+
+	printk("OMAP%04x", system_rev >> 16);
+	if ((system_rev >> 8) & 0xff)
+		printk("%x", (system_rev >> 8) & 0xff);
+	printk(" revision %i handled as %02xxx id: %08x%08x\n",
+	       die_rev, system_rev & 0xff, system_serial_low,
+	       system_serial_high);
 }
 
 /*
@@ -104,25 +233,23 @@ static struct map_desc omap1510_io_desc[] __initdata = {
 };
 #endif
 
-#if defined(CONFIG_ARCH_OMAP1610) || defined(CONFIG_ARCH_OMAP1710)
+#if defined(CONFIG_ARCH_OMAP16XX)
 static struct map_desc omap1610_io_desc[] __initdata = {
- { OMAP1610_DSP_BASE,    OMAP1610_DSP_START,    OMAP1610_DSP_SIZE,    MT_DEVICE },
- { OMAP1610_DSPREG_BASE, OMAP1610_DSPREG_START, OMAP1610_DSPREG_SIZE, MT_DEVICE },
- { OMAP1610_SRAM_BASE,   OMAP1610_SRAM_START,   OMAP1610_SRAM_SIZE,   MT_DEVICE }
+ { OMAP16XX_DSP_BASE,    OMAP16XX_DSP_START,    OMAP16XX_DSP_SIZE,    MT_DEVICE },
+ { OMAP16XX_DSPREG_BASE, OMAP16XX_DSPREG_START, OMAP16XX_DSPREG_SIZE, MT_DEVICE },
+ { OMAP16XX_SRAM_BASE,   OMAP16XX_SRAM_START,   OMAP1610_SRAM_SIZE,   MT_DEVICE }
 };
-#endif
 
-#ifdef CONFIG_ARCH_OMAP5912
 static struct map_desc omap5912_io_desc[] __initdata = {
- { OMAP5912_DSP_BASE,    OMAP5912_DSP_START,    OMAP5912_DSP_SIZE,    MT_DEVICE },
- { OMAP5912_DSPREG_BASE, OMAP5912_DSPREG_START, OMAP5912_DSPREG_SIZE, MT_DEVICE },
+ { OMAP16XX_DSP_BASE,    OMAP16XX_DSP_START,    OMAP16XX_DSP_SIZE,    MT_DEVICE },
+ { OMAP16XX_DSPREG_BASE, OMAP16XX_DSPREG_START, OMAP16XX_DSPREG_SIZE, MT_DEVICE },
 /*
  * The OMAP5912 has 250kByte internal SRAM. Because the mapping is baseed on page
  * size (4kByte), it seems that the last 2kByte (=0x800) of the 250kByte are not mapped.
  * Add additional 2kByte (0x800) so that the last page is mapped and the last 2kByte
  * can be used.
  */
- { OMAP5912_SRAM_BASE,   OMAP5912_SRAM_START,   OMAP5912_SRAM_SIZE + 0x800,   MT_DEVICE }
+ { OMAP16XX_SRAM_BASE,   OMAP16XX_SRAM_START,   OMAP5912_SRAM_SIZE + 0x800,   MT_DEVICE }
 };
 #endif
 
@@ -137,6 +264,9 @@ static void __init _omap_map_io(void)
 	iotable_init(omap_io_desc, ARRAY_SIZE(omap_io_desc));
 	omap_check_revision();
 
+	/* clear BM to canonicalize CS0 (not CS3) at 0000:0000 */
+	omap_writel(omap_readl(EMIFS_CONFIG) & 0x0d, EMIFS_CONFIG);
+
 #ifdef CONFIG_ARCH_OMAP730
 	if (cpu_is_omap730()) {
 		iotable_init(omap730_io_desc, ARRAY_SIZE(omap730_io_desc));
@@ -147,12 +277,10 @@ static void __init _omap_map_io(void)
 		iotable_init(omap1510_io_desc, ARRAY_SIZE(omap1510_io_desc));
 	}
 #endif
-#if defined(CONFIG_ARCH_OMAP1610) || defined(CONFIG_ARCH_OMAP1710)
+#if defined(CONFIG_ARCH_OMAP16XX)
 	if (cpu_is_omap1610() || cpu_is_omap1710()) {
 		iotable_init(omap1610_io_desc, ARRAY_SIZE(omap1610_io_desc));
 	}
-#endif
-#ifdef CONFIG_ARCH_OMAP5912
 	if (cpu_is_omap5912()) {
 		iotable_init(omap5912_io_desc, ARRAY_SIZE(omap5912_io_desc));
 	}
@@ -166,7 +294,7 @@ static void __init _omap_map_io(void)
 
 	/* Must init clocks early to assure that timer interrupt works
 	 */
-	init_ck();
+	clk_init();
 }
 
 /*
@@ -178,26 +306,144 @@ void omap_map_io(void)
 		_omap_map_io();
 }
 
+static struct uart_port omap_serial_ports[] = {
+	{
+		.membase	= (char*)IO_ADDRESS(OMAP_UART1_BASE),
+		.mapbase	= (unsigned long)OMAP_UART1_BASE,
+		.irq		= INT_UART1,
+		.flags		= UPF_SKIP_TEST,
+		.iotype		= UPIO_MEM,
+		.regshift	= 2,
+		.uartclk	= OMAP16XX_BASE_BAUD * 16,
+		.line		= 0,
+		.type		= PORT_OMAP,
+		.fifosize	= 64
+	} , {
+		.membase	= (char*)IO_ADDRESS(OMAP_UART2_BASE),
+		.mapbase	= (unsigned long)OMAP_UART2_BASE,
+		.irq		= INT_UART2,
+		.flags		= UPF_SKIP_TEST,
+		.iotype		= UPIO_MEM,
+		.regshift	= 2,
+		.uartclk	= OMAP16XX_BASE_BAUD * 16,
+		.line		= 1,
+		.type		= PORT_OMAP,
+		.fifosize	= 64
+	} , {
+		.membase	= (char*)IO_ADDRESS(OMAP_UART3_BASE),
+		.mapbase	= (unsigned long)OMAP_UART3_BASE,
+		.irq		= INT_UART3,
+		.flags		= UPF_SKIP_TEST,
+		.iotype		= UPIO_MEM,
+		.regshift	= 2,
+		.uartclk	= OMAP16XX_BASE_BAUD * 16,
+		.line		= 2,
+		.type		= PORT_OMAP,
+		.fifosize	= 64
+	}
+};
+
+/*
+ * Note that on Innovator-1510 UART2 pins conflict with USB2.
+ * By default UART2 does not work on Innovator-1510 if you have
+ * USB OHCI enabled. To use UART2, you must disable USB2 first.
+ */
+void __init omap_serial_init(int ports[OMAP_MAX_NR_PORTS])
+{
+	int i;
+
+	if (cpu_is_omap730()) {
+		omap_serial_ports[0].regshift = 0;
+		omap_serial_ports[1].regshift = 0;
+		omap_serial_ports[0].irq = INT_730_UART_MODEM_1;
+		omap_serial_ports[1].irq = INT_730_UART_MODEM_IRDA_2;
+	}
+
+	if (cpu_is_omap1510()) {
+		omap_serial_ports[0].uartclk = OMAP1510_BASE_BAUD * 16;
+		omap_serial_ports[1].uartclk = OMAP1510_BASE_BAUD * 16;
+		omap_serial_ports[2].uartclk = OMAP1510_BASE_BAUD * 16;
+	}
+
+	for (i = 0; i < OMAP_MAX_NR_PORTS; i++) {
+		unsigned long port;
+		unsigned char regshift;
+		unsigned char reg;
+
+		if (ports[i] != 1)
+			continue;
+
+		switch (i) {
+		case 0:
+			if (cpu_is_omap1510()) {
+				omap_cfg_reg(UART1_TX);
+				omap_cfg_reg(UART1_RTS);
+				if (machine_is_omap_innovator()) {
+					reg = fpga_read(OMAP1510_FPGA_POWER);
+					reg |= OMAP1510_FPGA_PCR_COM1_EN;
+					fpga_write(reg, OMAP1510_FPGA_POWER);
+					udelay(1);
+				}
+			}
+			break;
+		case 1:
+			if (cpu_is_omap1510()) {
+				omap_cfg_reg(UART2_TX);
+				omap_cfg_reg(UART2_RTS);
+				if (machine_is_omap_innovator()) {
+					reg = fpga_read(OMAP1510_FPGA_POWER);
+					reg |= OMAP1510_FPGA_PCR_COM2_EN;
+					fpga_write(reg, OMAP1510_FPGA_POWER);
+					udelay(1);
+				}
+			}
+			break;
+		case 2:
+			if (cpu_is_omap1510()) {
+				omap_cfg_reg(UART3_TX);
+				omap_cfg_reg(UART3_RX);
+			}
+			break;
+		}
+
+		/* Reset port */
+		if (!cpu_is_omap1510()) {
+			port = (unsigned long)omap_serial_ports[i].membase;
+			regshift = omap_serial_ports[i].regshift;
+			writeb(0x01, port + (UART_SYSC << regshift));
+			while (!(readb(port + (UART_SYSC << regshift)) & 0x01));
+		}
+
+		//early_serial_setup(&omap_serial_ports[i]);
+	}
+}
+
+#define NO_LENGTH_CHECK 0xffffffff
+
 extern int omap_bootloader_tag_len;
 extern u8 omap_bootloader_tag[];
 
 struct omap_board_config_kernel *omap_board_config;
 int omap_board_config_size = 0;
 
-const void *__omap_get_config(u16 tag, size_t len)
+static const void *get_config(u16 tag, size_t len, int skip, size_t *len_out)
 {
-	struct omap_board_config_entry *info = NULL;
 	struct omap_board_config_kernel *kinfo = NULL;
 	int i;
 
 #ifdef CONFIG_OMAP_BOOT_TAG
+	struct omap_board_config_entry *info = NULL;
+
 	if (omap_bootloader_tag_len > 4)
 		info = (struct omap_board_config_entry *) omap_bootloader_tag;
 	while (info != NULL) {
 		u8 *next;
 
-		if (info->tag == tag)
-			break;
+		if (info->tag == tag) {
+			if (skip == 0)
+				break;
+			skip--;
+		}
 
 		next = (u8 *) info + sizeof(*info) + info->len;
 		if (next >= omap_bootloader_tag + omap_bootloader_tag_len)
@@ -208,11 +454,13 @@ const void *__omap_get_config(u16 tag, size_t len)
 	if (info != NULL) {
 		/* Check the length as a lame attempt to check for
 		 * binary inconsistancy. */
-		if (info->len != len) {
+		if (len != NO_LENGTH_CHECK && info->len != len) {
 			printk(KERN_ERR "OMAP peripheral config: Length mismatch with tag %x (want %d, got %d)\n",
 			       tag, len, info->len);
 			return NULL;
 		}
+		if (len_out != NULL)
+			*len_out = info->len;
 		return info->data;
 	}
 #endif
@@ -228,8 +476,19 @@ const void *__omap_get_config(u16 tag, size_t len)
 		return NULL;
 	return kinfo->data;
 }
+
+const void *__omap_get_config(u16 tag, size_t len, int nr)
+{
+        return get_config(tag, len, nr, NULL);
+}
 EXPORT_SYMBOL(__omap_get_config);
 
+const void *omap_get_var_config(u16 tag, size_t *len)
+{
+        return get_config(tag, NO_LENGTH_CHECK, 0, len);
+}
+EXPORT_SYMBOL(omap_get_var_config);
+
 static int __init omap_add_serial_console(void)
 {
 	const struct omap_uart_config *info;

arch/arm/mach-omap/common.h

@@ -31,5 +31,6 @@ struct sys_timer;
 
 extern void omap_map_io(void);
 extern struct sys_timer omap_timer;
+extern void omap_serial_init(int ports[]);
 
 #endif /* __ARCH_ARM_MACH_OMAP_COMMON_H */

include/asm-arm/arch-omap/cpu.h

+/*
+ * linux/include/asm-arm/arch-omap/cpu.h
+ *
+ * OMAP cpu type detection
+ *
+ * Copyright (C) 2004 Nokia Corporation
+ *
+ * Written by Tony Lindgren <tony.lindgren@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#ifndef __ASM_ARCH_OMAP_CPU_H
+#define __ASM_ARCH_OMAP_CPU_H
+
+extern unsigned int system_rev;
+
+#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
+
+/*
+ * Test if multicore OMAP support is needed
+ */
+#undef MULTI_OMAP
+#undef OMAP_NAME
+
+#ifdef CONFIG_ARCH_OMAP730
+# ifdef OMAP_NAME
+#  undef  MULTI_OMAP
+#  define MULTI_OMAP
+# else
+#  define OMAP_NAME omap730
+# endif
+#endif
+#ifdef CONFIG_ARCH_OMAP1510
+# ifdef OMAP_NAME
+#  undef  MULTI_OMAP
+#  define MULTI_OMAP
+# else
+#  define OMAP_NAME omap1510
+# endif
+#endif
+#ifdef CONFIG_ARCH_OMAP16XX
+# ifdef OMAP_NAME
+#  undef  MULTI_OMAP
+#  define MULTI_OMAP
+# else
+#  define OMAP_NAME omap1610
+# endif
+#endif
+#ifdef CONFIG_ARCH_OMAP16XX
+# ifdef OMAP_NAME
+#  undef  MULTI_OMAP
+#  define MULTI_OMAP
+# else
+#  define OMAP_NAME omap1710
+# endif
+#endif
+
+/*
+ * Generate various OMAP cpu specific macros, and cpu class
+ * specific macros
+ */
+#define GET_OMAP_TYPE	((system_rev >> 24) & 0xff)
+#define GET_OMAP_CLASS	(system_rev & 0xff)
+
+#define IS_OMAP_TYPE(type, id)				\
+static inline int is_omap ##type (void)			\
+{							\
+	return (GET_OMAP_TYPE == (id)) ? 1 : 0;		\
+}
+
+#define IS_OMAP_CLASS(class, id)			\
+static inline int is_omap ##class (void)		\
+{							\
+	return (GET_OMAP_CLASS == (id)) ? 1 : 0;	\
+}
+
+IS_OMAP_TYPE(730, 0x07)
+IS_OMAP_TYPE(1510, 0x15)
+IS_OMAP_TYPE(1610, 0x16)
+IS_OMAP_TYPE(5912, 0x16)
+IS_OMAP_TYPE(1710, 0x17)
+IS_OMAP_TYPE(2420, 0x24)
+
+IS_OMAP_CLASS(7xx, 0x07)
+IS_OMAP_CLASS(15xx, 0x15)
+IS_OMAP_CLASS(16xx, 0x16)
+IS_OMAP_CLASS(24xx, 0x24)
+
+/*
+ * Macros to group OMAP types into cpu classes.
+ * These can be used in most places.
+ * cpu_is_omap15xx():	True for 1510 and 5910
+ * cpu_is_omap16xx():	True for 1610, 5912 and 1710
+ */
+#if defined(MULTI_OMAP)
+# define cpu_is_omap7xx()		is_omap7xx()
+# define cpu_is_omap15xx()		is_omap15xx()
+# if !(defined(CONFIG_ARCH_OMAP1510) || defined(CONFIG_ARCH_OMAP730))
+#  define cpu_is_omap16xx()		1
+# else
+#  define cpu_is_omap16xx()		is_omap16xx()
+# endif
+#else
+# if defined(CONFIG_ARCH_OMAP730)
+#  define cpu_is_omap7xx()		1
+# else
+#  define cpu_is_omap7xx()		0
+# endif
+# if defined(CONFIG_ARCH_OMAP1510)
+#  define cpu_is_omap15xx()		1
+# else
+#  define cpu_is_omap15xx()		0
+# endif
+# if defined(CONFIG_ARCH_OMAP16XX)
+#  define cpu_is_omap16xx()		1
+# else
+#  define cpu_is_omap16xx()		0
+# endif
+#endif
+
+#if defined(MULTI_OMAP)
+# define cpu_is_omap730()		is_omap730()
+# define cpu_is_omap1510()		is_omap1510()
+# define cpu_is_omap1610()		is_omap1610()
+# define cpu_is_omap5912()		is_omap5912()
+# define cpu_is_omap1710()		is_omap1710()
+#else
+# if defined(CONFIG_ARCH_OMAP730)
+#  define cpu_is_omap730()		1
+# else
+#  define cpu_is_omap730()		0
+# endif
+# if defined(CONFIG_ARCH_OMAP1510)
+#  define cpu_is_omap1510()		1
+# else
+#  define cpu_is_omap1510()		0
+# endif
+# if defined(CONFIG_ARCH_OMAP16XX)
+#  define cpu_is_omap1610()		1
+# else
+#  define cpu_is_omap1610()		0
+# endif
+# if defined(CONFIG_ARCH_OMAP16XX)
+#  define cpu_is_omap5912()		1
+# else
+#  define cpu_is_omap5912()		0
+# endif
+# if defined(CONFIG_ARCH_OMAP16XX)
+# define cpu_is_omap1610()		is_omap1610()
+# define cpu_is_omap5912()		is_omap5912()
+# define cpu_is_omap1710()		is_omap1710()
+# else
+# define cpu_is_omap1610()		0
+# define cpu_is_omap5912()		0
+# define cpu_is_omap1710()		0
+# endif
+# if defined(CONFIG_ARCH_OMAP2420)
+#  define cpu_is_omap2420()		1
+# else
+#  define cpu_is_omap2420()		0
+# endif
+#endif
+
+#endif