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// SPDX-License-Identifier: GPL-2.0
/*
* IXP4xx Device Tree boot support
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
/*
* These are the only fixed phys to virt mappings we ever need
* we put it right after the UART mapping at 0xffc80000-0xffc81fff
*/
#define IXP4XX_EXP_CFG_BASE_PHYS 0xC4000000
#define IXP4XX_EXP_CFG_BASE_VIRT 0xFEC14000
static struct map_desc ixp4xx_of_io_desc[] __initdata = {
/*
* This is needed for runtime system configuration checks,
* such as reading if hardware so-and-so is present. This
* could eventually be converted into a syscon once all boards
* are converted to device tree.
*/
{
.virtual = IXP4XX_EXP_CFG_BASE_VIRT,
.pfn = __phys_to_pfn(IXP4XX_EXP_CFG_BASE_PHYS),
.length = SZ_4K,
.type = MT_DEVICE,
},
#ifdef CONFIG_DEBUG_UART_8250
/* This is needed for LL-debug/earlyprintk/debug-macro.S */
{
.virtual = CONFIG_DEBUG_UART_VIRT,
.pfn = __phys_to_pfn(CONFIG_DEBUG_UART_PHYS),
.length = SZ_4K,
.type = MT_DEVICE,
},
#endif
};
static void __init ixp4xx_of_map_io(void)
{
iotable_init(ixp4xx_of_io_desc, ARRAY_SIZE(ixp4xx_of_io_desc));
}
/*
* We handle 4 differen SoC families. These compatible strings are enough
* to provide the core so that different boards can add their more detailed
* specifics.
*/
static const char *ixp4xx_of_board_compat[] = {
"intel,ixp42x",
"intel,ixp43x",
"intel,ixp45x",
"intel,ixp46x",
NULL,
};
DT_MACHINE_START(IXP4XX_DT, "IXP4xx (Device Tree)")
.map_io = ixp4xx_of_map_io,
.dt_compat = ixp4xx_of_board_compat,
MACHINE_END
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