arch/arm/mach-lpc32xx/common.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * arch/arm/mach-lpc32xx/common.c
   4  *
   5  * Author: Kevin Wells <kevin.wells@nxp.com>
   6  *
   7  * Copyright (C) 2010 NXP Semiconductors
   8  */
   9
  10 #include <linux/init.h>
  11
  12 #include <asm/mach/map.h>
  13 #include <asm/system_info.h>
  14
  15 #include <mach/hardware.h>
  16 #include <mach/platform.h>
  17 #include "common.h"
  18
  19 /*
  20  * Returns the unique ID for the device
  21  */
  22 void lpc32xx_get_uid(u32 devid[4])
  23 {
  24         int i;
  25
  26         for (i = 0; i < 4; i++)
  27                 devid[i] = __raw_readl(LPC32XX_CLKPWR_DEVID(i << 2));
  28 }
  29
  30 /*
  31  * Detects and returns IRAM size for the device variation
  32  */
  33 #define LPC32XX_IRAM_BANK_SIZE SZ_128K
  34 static u32 iram_size;
  35 u32 lpc32xx_return_iram_size(void)
  36 {
  37         if (iram_size == 0) {
  38                 u32 savedval1, savedval2;
  39                 void __iomem *iramptr1, *iramptr2;
  40
  41                 iramptr1 = io_p2v(LPC32XX_IRAM_BASE);
  42                 iramptr2 = io_p2v(LPC32XX_IRAM_BASE + LPC32XX_IRAM_BANK_SIZE);
  43                 savedval1 = __raw_readl(iramptr1);
  44                 savedval2 = __raw_readl(iramptr2);
  45
  46                 if (savedval1 == savedval2) {
  47                         __raw_writel(savedval2 + 1, iramptr2);
  48                         if (__raw_readl(iramptr1) == savedval2 + 1)
  49                                 iram_size = LPC32XX_IRAM_BANK_SIZE;
  50                         else
  51                                 iram_size = LPC32XX_IRAM_BANK_SIZE * 2;
  52                         __raw_writel(savedval2, iramptr2);
  53                 } else
  54                         iram_size = LPC32XX_IRAM_BANK_SIZE * 2;
  55         }
  56
  57         return iram_size;
  58 }
  59 EXPORT_SYMBOL_GPL(lpc32xx_return_iram_size);
  60
  61 static struct map_desc lpc32xx_io_desc[] __initdata = {
  62         {
  63                 .virtual        = (unsigned long)IO_ADDRESS(LPC32XX_AHB0_START),
  64                 .pfn            = __phys_to_pfn(LPC32XX_AHB0_START),
  65                 .length         = LPC32XX_AHB0_SIZE,
  66                 .type           = MT_DEVICE
  67         },
  68         {
  69                 .virtual        = (unsigned long)IO_ADDRESS(LPC32XX_AHB1_START),
  70                 .pfn            = __phys_to_pfn(LPC32XX_AHB1_START),
  71                 .length         = LPC32XX_AHB1_SIZE,
  72                 .type           = MT_DEVICE
  73         },
  74         {
  75                 .virtual        = (unsigned long)IO_ADDRESS(LPC32XX_FABAPB_START),
  76                 .pfn            = __phys_to_pfn(LPC32XX_FABAPB_START),
  77                 .length         = LPC32XX_FABAPB_SIZE,
  78                 .type           = MT_DEVICE
  79         },
  80         {
  81                 .virtual        = (unsigned long)IO_ADDRESS(LPC32XX_IRAM_BASE),
  82                 .pfn            = __phys_to_pfn(LPC32XX_IRAM_BASE),
  83                 .length         = (LPC32XX_IRAM_BANK_SIZE * 2),
  84                 .type           = MT_DEVICE
  85         },
  86 };
  87
  88 void __init lpc32xx_map_io(void)
  89 {
  90         iotable_init(lpc32xx_io_desc, ARRAY_SIZE(lpc32xx_io_desc));
  91 }
  92
  93 static int __init lpc32xx_check_uid(void)
  94 {
  95         u32 uid[4];
  96
  97         lpc32xx_get_uid(uid);
  98
  99         printk(KERN_INFO "LPC32XX unique ID: %08x%08x%08x%08x\n",
 100                 uid[3], uid[2], uid[1], uid[0]);
 101
 102         if (!system_serial_low && !system_serial_high) {
 103                 system_serial_low = uid[0];
 104                 system_serial_high = uid[1];
 105         }
 106
 107         return 1;
 108 }
 109 arch_initcall(lpc32xx_check_uid);