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https://github.com/Atmosphere-NX/Atmosphere.git
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76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
/*
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* Copyright (c) 2018-2019 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "i2c.h"
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#include "timer.h"
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/* Prototypes for internal commands. */
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void i2c_set_test_master_config_load(void);
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void i2c_write(unsigned int device, uint32_t val, unsigned int num_bytes);
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void i2c_send_byte_command(unsigned int device, unsigned char reg, unsigned char b);
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/* Load hardware config for I2C5. */
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void i2c_set_test_master_config_load(void) {
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/* Set MSTR_CONFIG_LOAD. */
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I2C_I2C_CONFIG_LOAD_0 = 0x1;
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while (I2C_I2C_CONFIG_LOAD_0 & 1) {
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/* Wait forever until it's unset. */
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}
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}
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/* Writes a value to an i2c device. */
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void i2c_write(unsigned int device, uint32_t val, unsigned int num_bytes) {
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if (num_bytes > 4) {
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return;
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}
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/* Set device for 7-bit mode. */
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I2C_I2C_CMD_ADDR0_0 = device << 1;
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/* Load in data to write. */
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I2C_I2C_CMD_DATA1_0 = val;
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/* Set config with LENGTH = num_bytes, NEW_MASTER_FSM, DEBOUNCE_CNT = 4T. */
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I2C_I2C_CNFG_0 = ((num_bytes << 1) - 2) | 0x2800;
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i2c_set_test_master_config_load();
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/* Config |= SEND; */
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I2C_I2C_CNFG_0 = ((num_bytes << 1) - 2) | 0x2800 | 0x200;
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while (I2C_I2C_STATUS_0 & 0x100) {
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/* Wait until not busy. */
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}
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while (I2C_I2C_STATUS_0 & 0xF) {
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/* Wait until write successful. */
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}
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}
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/* Writes a byte val to reg for given device. */
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void i2c_send_byte_command(unsigned int device, unsigned char reg, unsigned char b) {
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uint32_t val = (reg) | (b << 8);
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/* Write 1 byte (reg) + 1 byte (value) */
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i2c_write(device, val, 2);
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}
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/* Enable the PMIC. */
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void i2c_enable_pmic(void) {
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/* Write 00 to Device 27 Reg 00. */
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i2c_send_byte_command(27, 0, 0x80);
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}
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