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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* arch/arm/mach-lpc32xx/common.c
*
* Author: Kevin Wells <kevin.wells@nxp.com>
*
* Copyright (C) 2010 NXP Semiconductors
*/
#include <linux/init.h>
#include <linux/soc/nxp/lpc32xx-misc.h>
#include <asm/mach/map.h>
#include <asm/system_info.h>
#include <mach/hardware.h>
#include <mach/platform.h>
#include "common.h"
/*
* Returns the unique ID for the device
*/
void lpc32xx_get_uid(u32 devid[4])
{
int i;
for (i = 0; i < 4; i++)
devid[i] = __raw_readl(LPC32XX_CLKPWR_DEVID(i << 2));
}
/*
* Detects and returns IRAM size for the device variation
*/
#define LPC32XX_IRAM_BANK_SIZE SZ_128K
static u32 iram_size;
u32 lpc32xx_return_iram(void __iomem **mapbase, dma_addr_t *dmaaddr)
{
if (iram_size == 0) {
u32 savedval1, savedval2;
void __iomem *iramptr1, *iramptr2;
iramptr1 = io_p2v(LPC32XX_IRAM_BASE);
iramptr2 = io_p2v(LPC32XX_IRAM_BASE + LPC32XX_IRAM_BANK_SIZE);
savedval1 = __raw_readl(iramptr1);
savedval2 = __raw_readl(iramptr2);
if (savedval1 == savedval2) {
__raw_writel(savedval2 + 1, iramptr2);
if (__raw_readl(iramptr1) == savedval2 + 1)
iram_size = LPC32XX_IRAM_BANK_SIZE;
else
iram_size = LPC32XX_IRAM_BANK_SIZE * 2;
__raw_writel(savedval2, iramptr2);
} else
iram_size = LPC32XX_IRAM_BANK_SIZE * 2;
}
if (dmaaddr)
*dmaaddr = LPC32XX_IRAM_BASE;
if (mapbase)
*mapbase = io_p2v(LPC32XX_IRAM_BASE);
return iram_size;
}
EXPORT_SYMBOL_GPL(lpc32xx_return_iram);
static struct map_desc lpc32xx_io_desc[] __initdata = {
{
.virtual = (unsigned long)IO_ADDRESS(LPC32XX_AHB0_START),
.pfn = __phys_to_pfn(LPC32XX_AHB0_START),
.length = LPC32XX_AHB0_SIZE,
.type = MT_DEVICE
},
{
.virtual = (unsigned long)IO_ADDRESS(LPC32XX_AHB1_START),
.pfn = __phys_to_pfn(LPC32XX_AHB1_START),
.length = LPC32XX_AHB1_SIZE,
.type = MT_DEVICE
},
{
.virtual = (unsigned long)IO_ADDRESS(LPC32XX_FABAPB_START),
.pfn = __phys_to_pfn(LPC32XX_FABAPB_START),
.length = LPC32XX_FABAPB_SIZE,
.type = MT_DEVICE
},
{
.virtual = (unsigned long)IO_ADDRESS(LPC32XX_IRAM_BASE),
.pfn = __phys_to_pfn(LPC32XX_IRAM_BASE),
.length = (LPC32XX_IRAM_BANK_SIZE * 2),
.type = MT_DEVICE
},
};
void __init lpc32xx_map_io(void)
{
iotable_init(lpc32xx_io_desc, ARRAY_SIZE(lpc32xx_io_desc));
}
static int __init lpc32xx_check_uid(void)
{
u32 uid[4];
lpc32xx_get_uid(uid);
printk(KERN_INFO "LPC32XX unique ID: %08x%08x%08x%08x\n",
uid[3], uid[2], uid[1], uid[0]);
if (!system_serial_low && !system_serial_high) {
system_serial_low = uid[0];
system_serial_high = uid[1];
}
return 1;
}
arch_initcall(lpc32xx_check_uid);
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