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 */ 16 static 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 25 static 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 33 static 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 local_irq_enable(); 46 cpu_do_idle(); 47 } 48 49 static void __init gemini_init_machine(void) 50 { 51 arm_pm_idle = gemini_idle; 52 } 53 54 static const char *gemini_board_compat[] = { 55 "cortina,gemini", 56 NULL, 57 }; 58 59 DT_MACHINE_START(GEMINI_DT, "Gemini (Device Tree)") 60 .map_io = gemini_map_io, 61 .init_machine = gemini_init_machine, 62 .dt_compat = gemini_board_compat, 63 MACHINE_END 64