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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/arm/mach-gemini/board-dt.c
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// SPDX-License-Identifier: GPL-2.0

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/*

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 * Gemini 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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#include <asm/system_misc.h>

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#include <asm/proc-fns.h>

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#ifdef CONFIG_DEBUG_GEMINI

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/* This is needed for LL-debug/earlyprintk/debug-macro.S */

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static struct map_desc gemini_io_desc[] __initdata = {

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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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};

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static void __init gemini_map_io(void)

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{

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	iotable_init(gemini_io_desc, ARRAY_SIZE(gemini_io_desc));

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}

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#else

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#define gemini_map_io NULL

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#endif

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static void gemini_idle(void)

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{

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	/*

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	 * Because of broken hardware we have to enable interrupts or the CPU

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	 * will never wakeup... Acctualy it is not very good to enable

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	 * interrupts first since scheduler can miss a tick, but there is

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	 * no other way around this. Platforms that needs it for power saving

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	 * should enable it in init code, since by default it is

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	 * disabled.

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	 */

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	/* FIXME: Enabling interrupts here is racy! */

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	raw_local_irq_enable();

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	cpu_do_idle();

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	raw_local_irq_disable();

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}

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static void __init gemini_init_machine(void)

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{

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	arm_pm_idle = gemini_idle;

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}

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static const char *gemini_board_compat[] = {

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	"cortina,gemini",

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	NULL,

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};

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DT_MACHINE_START(GEMINI_DT, "Gemini (Device Tree)")

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	.map_io		= gemini_map_io,

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	.init_machine	= gemini_init_machine,

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	.dt_compat	= gemini_board_compat,

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MACHINE_END

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