LXR linux/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 */
  22void 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
  34static u32 iram_size;
  35u32 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}
  63EXPORT_SYMBOL_GPL(lpc32xx_return_iram);
  64
  65void 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}
  75EXPORT_SYMBOL_GPL(lpc32xx_set_phy_interface_mode);
  76
  77static 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
 104void __init lpc32xx_map_io(void)
 105{
 106        iotable_init(lpc32xx_io_desc, ARRAY_SIZE(lpc32xx_io_desc));
 107}
 108
 109static 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}
 125arch_initcall(lpc32xx_check_uid);
 126