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64 lines
1.6 KiB
64 lines
1.6 KiB
// 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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