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