SerenityOS/serenity
1
0 Fork 0
mirror of https://github.com/SerenityOS/serenity.git synced 2026-11-07 04:29:30 -10:00
Code Issues Packages Projects Releases Wiki Activity

Kernel/aarch64: Enable SD card power in raspberry_pi_5_platform_init()

Browse Source 
Since we currently don't support devicetree drivers depending on other
devicetree drivers (like the SD host controller driver depending on
the SD power regulators), do this in the platform init function for now.
In the future, we should have proper devicetree drivers for
"regulator-gpio" and "regulator-fixed" and use them to enable the
regulators in the SD host controller driver.
This commit is contained in:
Sönke Holz authored and Sönke Holz committed 2026-09-27 18:17:45 +02:00
1 parent 2986c7d6b6
commit d45a3c055a
1 file changed
+16
Download Patch File Download Diff File Expand all files Collapse all files
Kernel/Arch/aarch64/PlatformInit/RaspberryPi.cpp
+16
View File
@@ -8,6 +8,7 @@
#include <Kernel/Arch/aarch64/PlatformInit.h>
#include <Kernel/Arch/aarch64/DebugOutput.h>
#include <Kernel/Arch/aarch64/RPi/BroadcomSTBGPIOController.h>
#include <Kernel/Arch/aarch64/RPi/Framebuffer.h>
#include <Kernel/Arch/aarch64/RPi/GPIO.h>
#include <Kernel/Arch/aarch64/RPi/Mailbox.h>
@@ -95,6 +96,21 @@ void raspberry_pi_5_platform_init(StringView)
MUST(RPi::Mailbox::initialize(PhysicalAddress { 0x10'7c01'3880 }));
RPi::Framebuffer::initialize();
// Taken from the devicetree "brcm,gpio-bank-widths" property.
Array aon_gpio_bank_pin_counts = { 17zu, 6zu };
auto aon_gpio = MUST(RPi::BroadcomSTBGPIOController::create(PhysicalAddress { 0x10'7d51'7c00 }, aon_gpio_bank_pin_counts));
// Pin 3 controls the SD bus voltage (see the devicetree "sd-io-1v8-reg" power regulator node).
// Set it to low to use a bus voltage of 3.3V. High would mean 1.8V.
MUST(aon_gpio->set_pin_direction(3, RPi::BroadcomSTBGPIOController::PinDirection::Output));
MUST(aon_gpio->set_pin_output_level(3, RPi::BroadcomSTBGPIOController::LogicLevel::Low));
// Pin 4 controls the SD card power (see the devicetree "sd-vcc-reg" power regulator node).
// Set it to high to enable SD card power.
MUST(aon_gpio->set_pin_direction(4, RPi::BroadcomSTBGPIOController::PinDirection::Output));
MUST(aon_gpio->set_pin_output_level(4, RPi::BroadcomSTBGPIOController::LogicLevel::High));
}
}