/* * 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 <arch/io.h> #include <assert.h> #include <console/console.h> #include <delay.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; }