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Linux/arch/arm/mach-lpc32xx/common.c

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  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);
119 

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