/*
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* arch/arm/mach-lpc32xx/common.c
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*
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* Author: Kevin Wells <kevin.wells@nxp.com>
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*
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* Copyright (C) 2010 NXP Semiconductors
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/init.h>
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#include <asm/mach/map.h>
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#include <asm/system_info.h>
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#include <mach/hardware.h>
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#include <mach/platform.h>
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#include "common.h"
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/*
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* Returns the unique ID for the device
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*/
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void lpc32xx_get_uid(u32 devid[4])
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{
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int i;
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for (i = 0; i < 4; i++)
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devid[i] = __raw_readl(LPC32XX_CLKPWR_DEVID(i << 2));
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}
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/*
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* Detects and returns IRAM size for the device variation
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*/
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#define LPC32XX_IRAM_BANK_SIZE SZ_128K
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static u32 iram_size;
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u32 lpc32xx_return_iram_size(void)
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{
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if (iram_size == 0) {
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u32 savedval1, savedval2;
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void __iomem *iramptr1, *iramptr2;
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iramptr1 = io_p2v(LPC32XX_IRAM_BASE);
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iramptr2 = io_p2v(LPC32XX_IRAM_BASE + LPC32XX_IRAM_BANK_SIZE);
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savedval1 = __raw_readl(iramptr1);
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savedval2 = __raw_readl(iramptr2);
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if (savedval1 == savedval2) {
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__raw_writel(savedval2 + 1, iramptr2);
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if (__raw_readl(iramptr1) == savedval2 + 1)
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iram_size = LPC32XX_IRAM_BANK_SIZE;
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else
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iram_size = LPC32XX_IRAM_BANK_SIZE * 2;
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__raw_writel(savedval2, iramptr2);
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} else
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iram_size = LPC32XX_IRAM_BANK_SIZE * 2;
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}
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return iram_size;
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}
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EXPORT_SYMBOL_GPL(lpc32xx_return_iram_size);
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static struct map_desc lpc32xx_io_desc[] __initdata = {
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{
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.virtual = (unsigned long)IO_ADDRESS(LPC32XX_AHB0_START),
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.pfn = __phys_to_pfn(LPC32XX_AHB0_START),
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.length = LPC32XX_AHB0_SIZE,
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.type = MT_DEVICE
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},
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{
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.virtual = (unsigned long)IO_ADDRESS(LPC32XX_AHB1_START),
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.pfn = __phys_to_pfn(LPC32XX_AHB1_START),
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.length = LPC32XX_AHB1_SIZE,
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.type = MT_DEVICE
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},
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{
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.virtual = (unsigned long)IO_ADDRESS(LPC32XX_FABAPB_START),
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.pfn = __phys_to_pfn(LPC32XX_FABAPB_START),
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.length = LPC32XX_FABAPB_SIZE,
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.type = MT_DEVICE
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},
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{
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.virtual = (unsigned long)IO_ADDRESS(LPC32XX_IRAM_BASE),
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.pfn = __phys_to_pfn(LPC32XX_IRAM_BASE),
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.length = (LPC32XX_IRAM_BANK_SIZE * 2),
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.type = MT_DEVICE
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},
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};
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void __init lpc32xx_map_io(void)
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{
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iotable_init(lpc32xx_io_desc, ARRAY_SIZE(lpc32xx_io_desc));
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}
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static int __init lpc32xx_check_uid(void)
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{
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u32 uid[4];
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lpc32xx_get_uid(uid);
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printk(KERN_INFO "LPC32XX unique ID: %08x%08x%08x%08x\n",
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uid[3], uid[2], uid[1], uid[0]);
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if (!system_serial_low && !system_serial_high) {
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system_serial_low = uid[0];
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system_serial_high = uid[1];
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}
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return 1;
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}
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arch_initcall(lpc32xx_check_uid);
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