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 #include <linux/soc/nxp/lpc32xx-misc.h>
  12
  13 #include <asm/mach/map.h>
  14 #include <asm/system_info.h>
  15
  16 #include "lpc32xx.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(void __iomem **mapbase, dma_addr_t *dmaaddr)
  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         if (dmaaddr)
  57                 *dmaaddr = LPC32XX_IRAM_BASE;
  58         if (mapbase)
  59                 *mapbase = io_p2v(LPC32XX_IRAM_BASE);
  60
  61         return iram_size;
  62 }
  63 EXPORT_SYMBOL_GPL(lpc32xx_return_iram);
  64
  65 void lpc32xx_set_phy_interface_mode(phy_interface_t mode)
  66 {
  67         u32 tmp = __raw_readl(LPC32XX_CLKPWR_MACCLK_CTRL);
  68         tmp &= ~LPC32XX_CLKPWR_MACCTRL_PINS_MSK;
  69         if (mode == PHY_INTERFACE_MODE_MII)
  70                 tmp |= LPC32XX_CLKPWR_MACCTRL_USE_MII_PINS;
  71         else
  72                 tmp |= LPC32XX_CLKPWR_MACCTRL_USE_RMII_PINS;
  73         __raw_writel(tmp, LPC32XX_CLKPWR_MACCLK_CTRL);
  74 }
  75 EXPORT_SYMBOL_GPL(lpc32xx_set_phy_interface_mode);
  76
  77 static struct map_desc lpc32xx_io_desc[] __initdata = {
  78         {
  79                 .virtual        = (unsigned long)IO_ADDRESS(LPC32XX_AHB0_START),
  80                 .pfn            = __phys_to_pfn(LPC32XX_AHB0_START),
  81                 .length         = LPC32XX_AHB0_SIZE,
  82                 .type           = MT_DEVICE
  83         },
  84         {
  85                 .virtual        = (unsigned long)IO_ADDRESS(LPC32XX_AHB1_START),
  86                 .pfn            = __phys_to_pfn(LPC32XX_AHB1_START),
  87                 .length         = LPC32XX_AHB1_SIZE,
  88                 .type           = MT_DEVICE
  89         },
  90         {
  91                 .virtual        = (unsigned long)IO_ADDRESS(LPC32XX_FABAPB_START),
  92                 .pfn            = __phys_to_pfn(LPC32XX_FABAPB_START),
  93                 .length         = LPC32XX_FABAPB_SIZE,
  94                 .type           = MT_DEVICE
  95         },
  96         {
  97                 .virtual        = (unsigned long)IO_ADDRESS(LPC32XX_IRAM_BASE),
  98                 .pfn            = __phys_to_pfn(LPC32XX_IRAM_BASE),
  99                 .length         = (LPC32XX_IRAM_BANK_SIZE * 2),
 100                 .type           = MT_DEVICE
 101         },
 102 };
 103
 104 void __init lpc32xx_map_io(void)
 105 {
 106         iotable_init(lpc32xx_io_desc, ARRAY_SIZE(lpc32xx_io_desc));
 107 }
 108
 109 static int __init lpc32xx_check_uid(void)
 110 {
 111         u32 uid[4];
 112
 113         lpc32xx_get_uid(uid);
 114
 115         printk(KERN_INFO "LPC32XX unique ID: %08x%08x%08x%08x\n",
 116                 uid[3], uid[2], uid[1], uid[0]);
 117
 118         if (!system_serial_low && !system_serial_high) {
 119                 system_serial_low = uid[0];
 120                 system_serial_high = uid[1];
 121         }
 122
 123         return 1;
 124 }
 125 arch_initcall(lpc32xx_check_uid);