479 lines
14 KiB
C
479 lines
14 KiB
C
/*
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* Copyright (C) 2021 System76
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* Copyright (C) 2021 Jimmy Cassis <KernelOops@outlook.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for 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 <https://www.gnu.org/licenses/>.
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*/
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#include "usb_mux.h"
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#include <stdbool.h>
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#include "i2c_master.h"
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#include "wait.h"
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#define REG_PF1_CTL 0xBF800C04
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#define REG_PIO64_OEN 0xBF800908
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#define REG_PIO64_OUT 0xBF800928
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#define REG_VID 0xBF803000
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#define REG_PRT_SWAP 0xBF8030FA
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#define REG_USB3_HUB_VID 0xBFD2E548
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#define REG_RUNTIME_FLAGS2 0xBFD23408
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#define REG_I2S_FEAT_SEL 0xBFD23412
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struct USB7206 {
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uint8_t addr;
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};
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struct USB7206 usb_hub = {.addr = 0x2D};
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// Perform USB7206 register access.
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// Returns zero on success or a negative number on error.
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i2c_status_t usb7206_register_access(struct USB7206* self) {
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uint8_t register_access[3] = {
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0x99,
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0x37,
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0x00,
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};
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return i2c_transmit(self->addr << 1, register_access, sizeof(register_access), I2C_TIMEOUT);
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}
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// Read data from USB7206 register region.
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// Returns number of bytes read on success or a negative number on error.
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i2c_status_t usb7206_read_reg(struct USB7206* self, uint32_t addr, uint8_t* data, int length) {
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i2c_status_t status;
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uint8_t register_read[9] = {
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0x00, // Buffer address MSB: always 0
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0x00, // Buffer address LSB: always 0
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0x06, // Number of bytes to write to command block buffer area
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0x01, // Direction: 0 = write, 1 = read
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(uint8_t)length, // Number of bytes to read from register
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(uint8_t)(addr >> 24), // Register address byte 3
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(uint8_t)(addr >> 16), // Register address byte 2
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(uint8_t)(addr >> 8), // Register address byte 1
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(uint8_t)(addr >> 0), // Register address byte 0
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};
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status = i2c_transmit(self->addr << 1, register_read, sizeof(register_read), I2C_TIMEOUT);
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if (status < 0) {
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return status;
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}
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status = usb7206_register_access(self);
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if (status < 0) {
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return status;
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}
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uint8_t read[2] = {
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0x00, // Buffer address MSB: always 0
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0x06, // Buffer address LSB: 6 to skip header
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};
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status = i2c_start((self->addr << 1) | I2C_WRITE, I2C_TIMEOUT);
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if (status >= 0) {
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for (uint16_t i = 0; i < sizeof(read); i++) {
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status = i2c_write(read[i], I2C_TIMEOUT);
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if (status < 0) {
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goto error;
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}
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}
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} else {
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goto error;
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}
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status = i2c_start((self->addr << 1) | I2C_READ, I2C_TIMEOUT);
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if (status < 0) {
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goto error;
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}
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// Read and ignore buffer length
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status = i2c_read_ack(I2C_TIMEOUT);
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if (status < 0) {
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goto error;
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}
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for (uint16_t i = 0; i < (length - 1) && status >= 0; i++) {
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status = i2c_read_ack(I2C_TIMEOUT);
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if (status >= 0) {
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data[i] = (uint8_t)status;
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}
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}
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if (status >= 0) {
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status = i2c_read_nack(I2C_TIMEOUT);
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if (status >= 0) {
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data[(length - 1)] = (uint8_t)status;
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}
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}
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error:
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i2c_stop();
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return (status < 0) ? status : length;
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}
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// Read 32-bit value from USB7206 register region.
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// Returns number of bytes read on success or a negative number on error.
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i2c_status_t usb7206_read_reg_32(struct USB7206* self, uint32_t addr, uint32_t* data) {
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i2c_status_t status;
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// First byte is available length
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uint8_t bytes[4] = {0, 0, 0, 0};
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status = usb7206_read_reg(self, addr, bytes, sizeof(bytes));
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if (status < 0) {
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return status;
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}
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// Convert from little endian
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*data = (((uint32_t)bytes[0]) << 0) | (((uint32_t)bytes[1]) << 8) | (((uint32_t)bytes[2]) << 16) | (((uint32_t)bytes[3]) << 24);
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return status;
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}
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// Write data to USB7206 register region.
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// Returns number of bytes written on success or a negative number on error.
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i2c_status_t usb7206_write_reg(struct USB7206* self, uint32_t addr, uint8_t* data, int length) {
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i2c_status_t status;
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uint8_t register_write[9] = {
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0x00, // Buffer address MSB: always 0
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0x00, // Buffer address LSB: always 0
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((uint8_t)length) + 6, // Number of bytes to write to command block buffer area
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0x00, // Direction: 0 = write, 1 = read
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(uint8_t)length, // Number of bytes to write to register
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(uint8_t)(addr >> 24), // Register address byte 3
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(uint8_t)(addr >> 16), // Register address byte 2
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(uint8_t)(addr >> 8), // Register address byte 1
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(uint8_t)(addr >> 0), // Register address byte 0
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};
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status = i2c_start((self->addr << 1) | I2C_WRITE, I2C_TIMEOUT);
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if (status >= 0) {
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for (uint16_t i = 0; i < sizeof(register_write); i++) {
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status = i2c_write(register_write[i], I2C_TIMEOUT);
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if (status < 0) {
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goto error;
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}
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}
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for (uint16_t i = 0; i < length; i++) {
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status = i2c_write(data[i], I2C_TIMEOUT);
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if (status < 0) {
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goto error;
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}
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}
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} else {
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goto error;
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}
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i2c_stop();
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status = usb7206_register_access(self);
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if (status < 0) {
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goto error;
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}
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error:
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i2c_stop();
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return (status < 0) ? status : length;
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}
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// Write 8-bit value to USB7206 register region.
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// Returns number of bytes written on success or a negative number on error.
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i2c_status_t usb7206_write_reg_8(struct USB7206* self, uint32_t addr, uint8_t data) { return usb7206_write_reg(self, addr, &data, sizeof(data)); }
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// Write 32-bit value to USB7206 register region.
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// Returns number of bytes written on success or a negative number on error.
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i2c_status_t usb7206_write_reg_32(struct USB7206* self, uint32_t addr, uint32_t data) {
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// Convert to little endian
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uint8_t bytes[4] = {
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(uint8_t)(data >> 0),
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(uint8_t)(data >> 8),
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(uint8_t)(data >> 16),
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(uint8_t)(data >> 24),
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};
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return usb7206_write_reg(self, addr, bytes, sizeof(bytes));
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}
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// Initialize USB7206.
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// Returns zero on success or a negative number on error.
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int usb7206_init(struct USB7206* self) {
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i2c_status_t status;
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uint32_t data;
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// DM and DP are swapped on ports 2 and 3
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status = usb7206_write_reg_8(self, REG_PRT_SWAP, 0x0C);
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if (status < 0) {
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return status;
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}
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// Disable audio
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status = usb7206_write_reg_8(self, REG_I2S_FEAT_SEL, 0);
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if (status < 0) {
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return status;
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}
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// Set HFC_DISABLE
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data = 0;
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status = usb7206_read_reg_32(self, REG_RUNTIME_FLAGS2, &data);
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if (status < 0) {
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return status;
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}
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data |= 1;
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status = usb7206_write_reg_32(self, REG_RUNTIME_FLAGS2, data);
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if (status < 0) {
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return status;
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}
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// Set Vendor ID and Product ID of USB 2 hub
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status = usb7206_write_reg_32(self, REG_VID, 0x00033384);
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if (status < 0) {
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return status;
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}
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// Set Vendor ID and Product ID of USB 3 hub
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status = usb7206_write_reg_32(self, REG_USB3_HUB_VID, 0x00043384);
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if (status < 0) {
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return status;
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}
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return 0;
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}
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// Attach USB7206.
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// Returns bytes written on success or a negative number on error.
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i2c_status_t usb7206_attach(struct USB7206* self) {
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uint8_t data[3] = {
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0xAA,
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0x56,
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0x00,
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};
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return i2c_transmit(self->addr << 1, data, sizeof(data), I2C_TIMEOUT);
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}
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struct USB7206_GPIO {
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struct USB7206* usb7206;
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uint32_t pf;
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};
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struct USB7206_GPIO usb_gpio_sink = {.usb7206 = &usb_hub, .pf = 29}; // UP_SEL = PF29 = GPIO93
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struct USB7206_GPIO usb_gpio_source_left = {.usb7206 = &usb_hub, .pf = 10}; // CL_SEL = PF10 = GPIO74
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struct USB7206_GPIO usb_gpio_source_right = {.usb7206 = &usb_hub, .pf = 25}; // CR_SEL = PF25 = GPIO88
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// Set USB7206 GPIO to specified value.
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// Returns zero on success or negative number on error.
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i2c_status_t usb7206_gpio_set(struct USB7206_GPIO* self, bool value) {
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i2c_status_t status;
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uint32_t data;
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data = 0;
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status = usb7206_read_reg_32(self->usb7206, REG_PIO64_OUT, &data);
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if (status < 0) {
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return status;
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}
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if (value) {
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data |= (((uint32_t)1) << self->pf);
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} else {
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data &= ~(((uint32_t)1) << self->pf);
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}
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status = usb7206_write_reg_32(self->usb7206, REG_PIO64_OUT, data);
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if (status < 0) {
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return status;
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}
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return 0;
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}
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// Initialize USB7206 GPIO.
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// Returns zero on success or a negative number on error.
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i2c_status_t usb7206_gpio_init(struct USB7206_GPIO* self) {
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i2c_status_t status;
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uint32_t data;
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// Set programmable function to GPIO
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status = usb7206_write_reg_8(self->usb7206, REG_PF1_CTL + (self->pf - 1), 0);
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if (status < 0) {
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return status;
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}
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// Set GPIO to false by default
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usb7206_gpio_set(self, false);
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// Set GPIO to output
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data = 0;
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status = usb7206_read_reg_32(self->usb7206, REG_PIO64_OEN, &data);
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if (status < 0) {
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return status;
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}
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data |= (((uint32_t)1) << self->pf);
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status = usb7206_write_reg_32(self->usb7206, REG_PIO64_OEN, data);
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if (status < 0) {
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return status;
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}
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return 0;
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}
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struct PTN5110 {
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uint8_t addr;
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uint8_t cc;
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struct USB7206_GPIO* gpio;
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};
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struct PTN5110 usb_sink = {.addr = 0x51, .gpio = &usb_gpio_sink};
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struct PTN5110 usb_source_left = {.addr = 0x52, .gpio = &usb_gpio_source_left};
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struct PTN5110 usb_source_right = {.addr = 0x50, .gpio = &usb_gpio_source_right};
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// Initialize PTN5110.
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// Returns zero on success or a negative number on error.
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i2c_status_t ptn5110_init(struct PTN5110* self) {
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// Set last cc to invalid value, to force update
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self->cc = 0xFF;
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// Initialize GPIO
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return usb7206_gpio_init(self->gpio);
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}
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// Read PTN5110 CC_STATUS.
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// Returns zero on success or a negative number on error.
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i2c_status_t ptn5110_get_cc_status(struct PTN5110* self, uint8_t* cc) { return i2c_readReg(self->addr << 1, 0x1D, cc, 1, I2C_TIMEOUT); }
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// Set PTN5110 SSMUX orientation.
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// Returns zero on success or a negative number on error.
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i2c_status_t ptn5110_set_ssmux(struct PTN5110* self, bool orientation) { return usb7206_gpio_set(self->gpio, orientation); }
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// Write PTN5110 COMMAND.
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// Returns zero on success or negative number on error.
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i2c_status_t ptn5110_command(struct PTN5110* self, uint8_t command) { return i2c_writeReg(self->addr << 1, 0x23, &command, 1, I2C_TIMEOUT); }
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// Set orientation of PTN5110 operating as a sink, call this once.
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// Returns zero on success or a negative number on error.
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i2c_status_t ptn5110_sink_set_orientation(struct PTN5110* self) {
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i2c_status_t status;
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uint8_t cc;
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status = ptn5110_get_cc_status(self, &cc);
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if (status < 0) {
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return status;
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}
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if ((cc & 0x03) == 0) {
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status = ptn5110_set_ssmux(self, false);
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if (status < 0) {
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return status;
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}
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} else {
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status = ptn5110_set_ssmux(self, true);
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if (status < 0) {
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return status;
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}
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}
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return 0;
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}
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// Update PTN5110 operating as a source, call this repeatedly.
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// Returns zero on success or a negative number on error.
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i2c_status_t ptn5110_source_update(struct PTN5110* self) {
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i2c_status_t status;
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uint8_t cc;
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status = ptn5110_get_cc_status(self, &cc);
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if (status < 0) {
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return status;
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}
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if (cc != self->cc) {
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// WARNING: Setting this here will disable retries
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self->cc = cc;
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bool connected = false;
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bool orientation = false;
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if ((cc & 0x03) == 2) {
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connected = true;
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orientation = true;
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} else if (((cc >> 2) & 0x03) == 2) {
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connected = true;
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orientation = false;
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}
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if (connected) {
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// Set SS mux orientation
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status = ptn5110_set_ssmux(self, orientation);
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if (status < 0) {
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return status;
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}
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// Enable source Vbus command
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status = ptn5110_command(self, 0b01110111);
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if (status < 0) {
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return status;
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}
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} else {
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// Disable source Vbus command
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status = ptn5110_command(self, 0b01100110);
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if (status < 0) {
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return status;
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}
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}
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}
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return 0;
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}
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void usb_mux_event(void) {
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// Run this on every 1000th matrix scan
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static int cycle = 0;
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if (cycle >= 1000) {
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cycle = 0;
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ptn5110_source_update(&usb_source_left);
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ptn5110_source_update(&usb_source_right);
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} else {
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cycle += 1;
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}
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}
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void usb_mux_init(void) {
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// Run I2C bus at 100 kHz
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i2c_init();
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// Set up hub
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usb7206_init(&usb_hub);
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// Set up sink
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ptn5110_init(&usb_sink);
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ptn5110_sink_set_orientation(&usb_sink);
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// Set up sources
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ptn5110_init(&usb_source_left);
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ptn5110_init(&usb_source_right);
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// Attach hub
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usb7206_attach(&usb_hub);
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// Ensure orientation is correct after attaching hub
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// TODO: Find reason why GPIO for sink orientation is reset
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for (int i = 0; i < 100; i++) {
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ptn5110_sink_set_orientation(&usb_sink);
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wait_ms(10);
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}
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}
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