diff options
Diffstat (limited to 'arch/arm/mach-gemini/board-dt.c')
| -rw-r--r-- | arch/arm/mach-gemini/board-dt.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/arch/arm/mach-gemini/board-dt.c b/arch/arm/mach-gemini/board-dt.c new file mode 100644 index 000000000..de0afcc8d --- /dev/null +++ b/arch/arm/mach-gemini/board-dt.c @@ -0,0 +1,63 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Gemini Device Tree boot support + */ +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/io.h> + +#include <asm/mach/arch.h> +#include <asm/mach/map.h> +#include <asm/system_misc.h> +#include <asm/proc-fns.h> + +#ifdef CONFIG_DEBUG_GEMINI +/* This is needed for LL-debug/earlyprintk/debug-macro.S */ +static struct map_desc gemini_io_desc[] __initdata = { + { + .virtual = CONFIG_DEBUG_UART_VIRT, + .pfn = __phys_to_pfn(CONFIG_DEBUG_UART_PHYS), + .length = SZ_4K, + .type = MT_DEVICE, + }, +}; + +static void __init gemini_map_io(void) +{ + iotable_init(gemini_io_desc, ARRAY_SIZE(gemini_io_desc)); +} +#else +#define gemini_map_io NULL +#endif + +static void gemini_idle(void) +{ + /* + * Because of broken hardware we have to enable interrupts or the CPU + * will never wakeup... Acctualy it is not very good to enable + * interrupts first since scheduler can miss a tick, but there is + * no other way around this. Platforms that needs it for power saving + * should enable it in init code, since by default it is + * disabled. + */ + + /* FIXME: Enabling interrupts here is racy! */ + local_irq_enable(); + cpu_do_idle(); +} + +static void __init gemini_init_machine(void) +{ + arm_pm_idle = gemini_idle; +} + +static const char *gemini_board_compat[] = { + "cortina,gemini", + NULL, +}; + +DT_MACHINE_START(GEMINI_DT, "Gemini (Device Tree)") + .map_io = gemini_map_io, + .init_machine = gemini_init_machine, + .dt_compat = gemini_board_compat, +MACHINE_END |