| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2014 - 2015 The Linux Foundation. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| #include <assert.h> |
| #include <console/console.h> |
| #include <device/i2c_simple.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <soc/gsbi.h> |
| #include <soc/qup.h> |
| |
| static qup_config_t gsbi1_qup_config = { |
| QUP_MINICORE_I2C_MASTER, |
| 100000, |
| 24000000, |
| QUP_MODE_FIFO, |
| 0 |
| }; |
| |
| static qup_config_t gsbi4_qup_config = { |
| QUP_MINICORE_I2C_MASTER, |
| 100000, |
| 24000000, |
| QUP_MODE_FIFO, |
| 0 |
| }; |
| |
| static qup_config_t gsbi7_qup_config = { |
| QUP_MINICORE_I2C_MASTER, |
| 100000, |
| 24000000, |
| QUP_MODE_FIFO, |
| 0 |
| }; |
| |
| static int i2c_read(uint32_t gsbi_id, uint8_t slave, |
| uint8_t *data, int data_len) |
| { |
| qup_data_t obj; |
| qup_return_t qup_ret = 0; |
| |
| memset(&obj, 0, sizeof(obj)); |
| obj.protocol = QUP_MINICORE_I2C_MASTER; |
| obj.p.iic.addr = slave; |
| obj.p.iic.data_len = data_len; |
| obj.p.iic.data = data; |
| qup_ret = qup_recv_data(gsbi_id, &obj); |
| |
| if (QUP_SUCCESS != qup_ret) |
| return 1; |
| else |
| return 0; |
| } |
| |
| static int i2c_write(uint32_t gsbi_id, uint8_t slave, |
| uint8_t *data, int data_len, uint8_t stop_seq) |
| { |
| qup_data_t obj; |
| qup_return_t qup_ret = 0; |
| |
| memset(&obj, 0, sizeof(obj)); |
| obj.protocol = QUP_MINICORE_I2C_MASTER; |
| obj.p.iic.addr = slave; |
| obj.p.iic.data_len = data_len; |
| obj.p.iic.data = data; |
| qup_ret = qup_send_data(gsbi_id, &obj, stop_seq); |
| |
| if (QUP_SUCCESS != qup_ret) |
| return 1; |
| else |
| return 0; |
| } |
| |
| static int i2c_init(unsigned bus) |
| { |
| unsigned gsbi_id = bus; |
| qup_config_t *qup_config; |
| |
| switch (gsbi_id) { |
| case GSBI_ID_1: |
| qup_config = &gsbi1_qup_config; |
| break; |
| case GSBI_ID_4: |
| qup_config = &gsbi4_qup_config; |
| break; |
| case GSBI_ID_7: |
| qup_config = &gsbi7_qup_config; |
| break; |
| default: |
| printk(BIOS_ERR, "QUP configuration not defind for GSBI%d.\n", |
| gsbi_id); |
| return 1; |
| } |
| |
| if (qup_config->initialized) |
| return 0; |
| |
| if (gsbi_init(gsbi_id, GSBI_PROTO_I2C_ONLY)) { |
| printk(BIOS_ERR, "failed to initialize gsbi\n"); |
| return 1; |
| } |
| |
| if (qup_init(gsbi_id, qup_config)) { |
| printk(BIOS_ERR, "failed to initialize qup\n"); |
| return 1; |
| } |
| |
| if (qup_reset_i2c_master_status(gsbi_id)) { |
| printk(BIOS_ERR, "failed to reset i2c master status\n"); |
| return 1; |
| } |
| |
| qup_config->initialized = 1; |
| return 0; |
| } |
| |
| int platform_i2c_transfer(unsigned bus, struct i2c_msg *segments, |
| int seg_count) |
| { |
| struct i2c_msg *seg = segments; |
| int ret = 0; |
| |
| if (i2c_init(bus)) |
| return 1; |
| |
| while (!ret && seg_count--) { |
| if (seg->flags & I2C_M_RD) |
| ret = i2c_read(bus, seg->slave, seg->buf, seg->len); |
| else |
| ret = i2c_write(bus, seg->slave, seg->buf, seg->len, |
| (seg_count ? 0 : 1)); |
| seg++; |
| } |
| |
| if (ret) { |
| qup_set_state(bus, QUP_STATE_RESET); |
| return 1; |
| } |
| |
| return 0; |
| } |