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