Atmosphere/stratosphere/boot/source/boot_gpio_utils.cpp
2019-05-03 06:20:50 -07:00

120 lines
4.2 KiB
C++

/*
* Copyright (c) 2018-2019 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "boot_functions.hpp"
#include "boot_gpio_map.hpp"
static bool g_initialized_gpio_vaddr = false;
static uintptr_t g_gpio_vaddr = 0;
static inline u32 GetGpioPadDescriptor(u32 gpio_pad_name) {
if (gpio_pad_name >= GpioPadNameMax) {
std::abort();
}
return GpioMap[gpio_pad_name];
}
static uintptr_t GetGpioBaseAddress() {
if (!g_initialized_gpio_vaddr) {
u64 vaddr;
if (R_FAILED(svcQueryIoMapping(&vaddr, Boot::GpioPhysicalBase, 0x1000))) {
std::abort();
}
g_gpio_vaddr = vaddr;
g_initialized_gpio_vaddr = true;
}
return g_gpio_vaddr;
}
u32 Boot::GpioConfigure(u32 gpio_pad_name) {
uintptr_t gpio_base_vaddr = GetGpioBaseAddress();
/* Fetch this GPIO's pad descriptor */
const u32 gpio_pad_desc = GetGpioPadDescriptor(gpio_pad_name);
/* Discard invalid GPIOs */
if (gpio_pad_desc == GpioInvalid) {
return GpioInvalid;
}
/* Convert the GPIO pad descriptor into its register offset */
u32 gpio_reg_offset = (((gpio_pad_desc << 0x03) & 0xFFFFFF00) | ((gpio_pad_desc >> 0x01) & 0x0C));
/* Extract the bit and lock values from the GPIO pad descriptor */
u32 gpio_cnf_val = ((0x01 << ((gpio_pad_desc & 0x07) | 0x08)) | (0x01 << (gpio_pad_desc & 0x07)));
/* Write to the appropriate GPIO_CNF_x register (upper offset) */
*(reinterpret_cast<volatile u32 *>(gpio_base_vaddr + gpio_reg_offset + 0x80)) = gpio_cnf_val;
/* Do a dummy read from GPIO_CNF_x register (lower offset) */
gpio_cnf_val = *(reinterpret_cast<volatile u32 *>(gpio_base_vaddr + gpio_reg_offset));
return gpio_cnf_val;
}
u32 Boot::GpioSetDirection(u32 gpio_pad_name, GpioDirection dir) {
uintptr_t gpio_base_vaddr = GetGpioBaseAddress();
/* Fetch this GPIO's pad descriptor */
const u32 gpio_pad_desc = GetGpioPadDescriptor(gpio_pad_name);
/* Discard invalid GPIOs */
if (gpio_pad_desc == GpioInvalid) {
return GpioInvalid;
}
/* Convert the GPIO pad descriptor into its register offset */
u32 gpio_reg_offset = (((gpio_pad_desc << 0x03) & 0xFFFFFF00) | ((gpio_pad_desc >> 0x01) & 0x0C));
/* Set the direction bit and lock values */
u32 gpio_oe_val = ((0x01 << ((gpio_pad_desc & 0x07) | 0x08)) | (static_cast<u32>(dir) << (gpio_pad_desc & 0x07)));
/* Write to the appropriate GPIO_OE_x register (upper offset) */
*(reinterpret_cast<volatile u32 *>(gpio_base_vaddr + gpio_reg_offset + 0x90)) = gpio_oe_val;
/* Do a dummy read from GPIO_OE_x register (lower offset) */
gpio_oe_val = *(reinterpret_cast<volatile u32 *>(gpio_base_vaddr + gpio_reg_offset));
return gpio_oe_val;
}
u32 Boot::GpioSetValue(u32 gpio_pad_name, GpioValue val) {
uintptr_t gpio_base_vaddr = GetGpioBaseAddress();
/* Fetch this GPIO's pad descriptor */
const u32 gpio_pad_desc = GetGpioPadDescriptor(gpio_pad_name);
/* Discard invalid GPIOs */
if (gpio_pad_desc == GpioInvalid) {
return GpioInvalid;
}
/* Convert the GPIO pad descriptor into its register offset */
u32 gpio_reg_offset = (((gpio_pad_desc << 0x03) & 0xFFFFFF00) | ((gpio_pad_desc >> 0x01) & 0x0C));
/* Set the output bit and lock values */
u32 gpio_out_val = ((0x01 << ((gpio_pad_desc & 0x07) | 0x08)) | (static_cast<u32>(val) << (gpio_pad_desc & 0x07)));
/* Write to the appropriate GPIO_OUT_x register (upper offset) */
*(reinterpret_cast<volatile u32 *>(gpio_base_vaddr + gpio_reg_offset + 0xA0)) = gpio_out_val;
/* Do a dummy read from GPIO_OUT_x register (lower offset) */
gpio_out_val = *(reinterpret_cast<volatile u32 *>(gpio_base_vaddr + gpio_reg_offset));
return gpio_out_val;
}