arch/arm/mach-lpc32xx/common.c

   1 /*
   2  * arch/arm/mach-lpc32xx/common.c
   3  *
   4  * Author: Kevin Wells <kevin.wells@nxp.com>
   5  *
   6  * Copyright (C) 2010 NXP Semiconductors
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include <linux/init.h>
  20
  21 #include <asm/mach/map.h>
  22 #include <asm/system_info.h>
  23
  24 #include <mach/hardware.h>
  25 #include <mach/platform.h>
  26 #include "common.h"
  27
  28 /*
  29  * Returns the unique ID for the device
  30  */
  31 void lpc32xx_get_uid(u32 devid[4])
  32 {
  33         int i;
  34
  35         for (i = 0; i < 4; i++)
  36                 devid[i] = __raw_readl(LPC32XX_CLKPWR_DEVID(i << 2));
  37 }
  38
  39 /*
  40  * Detects and returns IRAM size for the device variation
  41  */
  42 #define LPC32XX_IRAM_BANK_SIZE SZ_128K
  43 static u32 iram_size;
  44 u32 lpc32xx_return_iram_size(void)
  45 {
  46         if (iram_size == 0) {
  47                 u32 savedval1, savedval2;
  48                 void __iomem *iramptr1, *iramptr2;
  49
  50                 iramptr1 = io_p2v(LPC32XX_IRAM_BASE);
  51                 iramptr2 = io_p2v(LPC32XX_IRAM_BASE + LPC32XX_IRAM_BANK_SIZE);
  52                 savedval1 = __raw_readl(iramptr1);
  53                 savedval2 = __raw_readl(iramptr2);
  54
  55                 if (savedval1 == savedval2) {
  56                         __raw_writel(savedval2 + 1, iramptr2);
  57                         if (__raw_readl(iramptr1) == savedval2 + 1)
  58                                 iram_size = LPC32XX_IRAM_BANK_SIZE;
  59                         else
  60                                 iram_size = LPC32XX_IRAM_BANK_SIZE * 2;
  61                         __raw_writel(savedval2, iramptr2);
  62                 } else
  63                         iram_size = LPC32XX_IRAM_BANK_SIZE * 2;
  64         }
  65
  66         return iram_size;
  67 }
  68 EXPORT_SYMBOL_GPL(lpc32xx_return_iram_size);
  69
  70 static struct map_desc lpc32xx_io_desc[] __initdata = {
  71         {
  72                 .virtual        = (unsigned long)IO_ADDRESS(LPC32XX_AHB0_START),
  73                 .pfn            = __phys_to_pfn(LPC32XX_AHB0_START),
  74                 .length         = LPC32XX_AHB0_SIZE,
  75                 .type           = MT_DEVICE
  76         },
  77         {
  78                 .virtual        = (unsigned long)IO_ADDRESS(LPC32XX_AHB1_START),
  79                 .pfn            = __phys_to_pfn(LPC32XX_AHB1_START),
  80                 .length         = LPC32XX_AHB1_SIZE,
  81                 .type           = MT_DEVICE
  82         },
  83         {
  84                 .virtual        = (unsigned long)IO_ADDRESS(LPC32XX_FABAPB_START),
  85                 .pfn            = __phys_to_pfn(LPC32XX_FABAPB_START),
  86                 .length         = LPC32XX_FABAPB_SIZE,
  87                 .type           = MT_DEVICE
  88         },
  89         {
  90                 .virtual        = (unsigned long)IO_ADDRESS(LPC32XX_IRAM_BASE),
  91                 .pfn            = __phys_to_pfn(LPC32XX_IRAM_BASE),
  92                 .length         = (LPC32XX_IRAM_BANK_SIZE * 2),
  93                 .type           = MT_DEVICE
  94         },
  95 };
  96
  97 void __init lpc32xx_map_io(void)
  98 {
  99         iotable_init(lpc32xx_io_desc, ARRAY_SIZE(lpc32xx_io_desc));
 100 }
 101
 102 static int __init lpc32xx_check_uid(void)
 103 {
 104         u32 uid[4];
 105
 106         lpc32xx_get_uid(uid);
 107
 108         printk(KERN_INFO "LPC32XX unique ID: %08x%08x%08x%08x\n",
 109                 uid[3], uid[2], uid[1], uid[0]);
 110
 111         if (!system_serial_low && !system_serial_high) {
 112                 system_serial_low = uid[0];
 113                 system_serial_high = uid[1];
 114         }
 115
 116         return 1;
 117 }
 118 arch_initcall(lpc32xx_check_uid);