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Kernel: Add Mailbox::set_clock_rate()

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Nico Weber 2021-09-25 23:28:50 -04:00 • committed by Brian Gianforcaro
parent 43d378940f
commit 44c787e88b
2 changed files with 39 additions and 0 deletions
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20
Kernel/Prekernel/Arch/aarch64/Mailbox.cpp
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@ -75,6 +75,7 @@ bool Mailbox::call(u8 channel, u32 volatile* __attribute__((aligned(16))) messag
}
constexpr u32 MBOX_TAG_GET_FIRMWARE_VERSION = 0x0000'0001;
constexpr u32 MBOX_TAG_SET_CLOCK_RATE = 0x0003'8002;
u32 Mailbox::query_firmware_version()
{
@ -96,4 +97,23 @@ u32 Mailbox::query_firmware_version()
return 0xffff'ffff;
}
u32 Mailbox::set_clock_rate(ClockID clock_id, u32 rate_hz, bool skip_setting_turbo)
{
u32 __attribute__((aligned(16))) message[9];
message[0] = sizeof(message);
message[1] = MBOX_REQUEST;
message[2] = MBOX_TAG_SET_CLOCK_RATE;
message[3] = 12; // Tag data size.
message[4] = MBOX_REQUEST;
message[5] = static_cast<u32>(clock_id);
message[6] = rate_hz;
message[7] = skip_setting_turbo ? 1 : 0;
message[8] = 0;
call(ARM_TO_VIDEOCORE_CHANNEL, message);
return message[6];
}
}