i2c.c

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/* SPDX-License-Identifier: BSD-3-Clause */
 
#include <console/console.h>
#include <device/i2c_simple.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 int bus)
{
        unsigned int 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 defined 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 int 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;
}