| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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 |