1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Gemini Device Tree boot support
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun #include <linux/kernel.h>
6*4882a593Smuzhiyun #include <linux/init.h>
7*4882a593Smuzhiyun #include <linux/io.h>
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <asm/mach/arch.h>
10*4882a593Smuzhiyun #include <asm/mach/map.h>
11*4882a593Smuzhiyun #include <asm/system_misc.h>
12*4882a593Smuzhiyun #include <asm/proc-fns.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #ifdef CONFIG_DEBUG_GEMINI
15*4882a593Smuzhiyun /* This is needed for LL-debug/earlyprintk/debug-macro.S */
16*4882a593Smuzhiyun static struct map_desc gemini_io_desc[] __initdata = {
17*4882a593Smuzhiyun {
18*4882a593Smuzhiyun .virtual = CONFIG_DEBUG_UART_VIRT,
19*4882a593Smuzhiyun .pfn = __phys_to_pfn(CONFIG_DEBUG_UART_PHYS),
20*4882a593Smuzhiyun .length = SZ_4K,
21*4882a593Smuzhiyun .type = MT_DEVICE,
22*4882a593Smuzhiyun },
23*4882a593Smuzhiyun };
24*4882a593Smuzhiyun
gemini_map_io(void)25*4882a593Smuzhiyun static void __init gemini_map_io(void)
26*4882a593Smuzhiyun {
27*4882a593Smuzhiyun iotable_init(gemini_io_desc, ARRAY_SIZE(gemini_io_desc));
28*4882a593Smuzhiyun }
29*4882a593Smuzhiyun #else
30*4882a593Smuzhiyun #define gemini_map_io NULL
31*4882a593Smuzhiyun #endif
32*4882a593Smuzhiyun
gemini_idle(void)33*4882a593Smuzhiyun static void gemini_idle(void)
34*4882a593Smuzhiyun {
35*4882a593Smuzhiyun /*
36*4882a593Smuzhiyun * Because of broken hardware we have to enable interrupts or the CPU
37*4882a593Smuzhiyun * will never wakeup... Acctualy it is not very good to enable
38*4882a593Smuzhiyun * interrupts first since scheduler can miss a tick, but there is
39*4882a593Smuzhiyun * no other way around this. Platforms that needs it for power saving
40*4882a593Smuzhiyun * should enable it in init code, since by default it is
41*4882a593Smuzhiyun * disabled.
42*4882a593Smuzhiyun */
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun /* FIXME: Enabling interrupts here is racy! */
45*4882a593Smuzhiyun local_irq_enable();
46*4882a593Smuzhiyun cpu_do_idle();
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun
gemini_init_machine(void)49*4882a593Smuzhiyun static void __init gemini_init_machine(void)
50*4882a593Smuzhiyun {
51*4882a593Smuzhiyun arm_pm_idle = gemini_idle;
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun static const char *gemini_board_compat[] = {
55*4882a593Smuzhiyun "cortina,gemini",
56*4882a593Smuzhiyun NULL,
57*4882a593Smuzhiyun };
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun DT_MACHINE_START(GEMINI_DT, "Gemini (Device Tree)")
60*4882a593Smuzhiyun .map_io = gemini_map_io,
61*4882a593Smuzhiyun .init_machine = gemini_init_machine,
62*4882a593Smuzhiyun .dt_compat = gemini_board_compat,
63*4882a593Smuzhiyun MACHINE_END
64