1// SPDX-License-Identifier: GPL-2.0 2/* 3 * Gemini Device Tree boot support 4 */ 5#include <linux/kernel.h> 6#include <linux/init.h> 7#include <linux/io.h> 8 9#include <asm/mach/arch.h> 10#include <asm/mach/map.h> 11#include <asm/system_misc.h> 12#include <asm/proc-fns.h> 13 14#ifdef CONFIG_DEBUG_GEMINI 15/* This is needed for LL-debug/earlyprintk/debug-macro.S */ 16static struct map_desc gemini_io_desc[] __initdata = { 17 { 18 .virtual = CONFIG_DEBUG_UART_VIRT, 19 .pfn = __phys_to_pfn(CONFIG_DEBUG_UART_PHYS), 20 .length = SZ_4K, 21 .type = MT_DEVICE, 22 }, 23}; 24 25static void __init gemini_map_io(void) 26{ 27 iotable_init(gemini_io_desc, ARRAY_SIZE(gemini_io_desc)); 28} 29#else 30#define gemini_map_io NULL 31#endif 32 33static void gemini_idle(void) 34{ 35 /* 36 * Because of broken hardware we have to enable interrupts or the CPU 37 * will never wakeup... Acctualy it is not very good to enable 38 * interrupts first since scheduler can miss a tick, but there is 39 * no other way around this. Platforms that needs it for power saving 40 * should enable it in init code, since by default it is 41 * disabled. 42 */ 43 44 /* FIXME: Enabling interrupts here is racy! */ 45 raw_local_irq_enable(); 46 cpu_do_idle(); 47 raw_local_irq_disable(); 48} 49 50static void __init gemini_init_machine(void) 51{ 52 arm_pm_idle = gemini_idle; 53} 54 55static const char *gemini_board_compat[] = { 56 "cortina,gemini", 57 NULL, 58}; 59 60DT_MACHINE_START(GEMINI_DT, "Gemini (Device Tree)") 61 .map_io = gemini_map_io, 62 .init_machine = gemini_init_machine, 63 .dt_compat = gemini_board_compat, 64MACHINE_END 65