| /* SPDX-License-Identifier: BSD-3-Clause */ |
| |
| #include <device/mmio.h> |
| #include <console/console.h> |
| #include <delay.h> |
| #include <soc/iomap.h> |
| #include <soc/qup.h> |
| |
| #define TIMEOUT_CNT 100 |
| |
| #define QUP_ADDR(id, reg) (blsp_qup_base(id) + (reg)) |
| |
| #define QUP_DEBUG 0 |
| |
| #define QUPDBG BIOS_ERR, "\t-> " |
| |
| #if QUP_DEBUG |
| #define qup_write32(a, v) do { \ |
| write32(a, v); \ |
| printk(QUPDBG "%s(%d): write32(%p, 0x%x)\n", \ |
| __func__, __LINE__, a, v); \ |
| } while (0) |
| #else |
| #define qup_write32 write32 |
| #endif |
| |
| static qup_return_t qup_i2c_master_status(blsp_qup_id_t id) |
| { |
| uint32_t reg_val = read32(QUP_ADDR(id, QUP_I2C_MASTER_STATUS)); |
| |
| if (read32(QUP_ADDR(id, QUP_ERROR_FLAGS))) |
| return QUP_ERR_XFER_FAIL; |
| |
| #if QUP_DEBUG |
| printk(QUPDBG "%s: 0x%x\n", __func__, reg_val); |
| #endif |
| |
| if (reg_val & QUP_I2C_INVALID_READ_ADDR) |
| return QUP_ERR_I2C_INVALID_SLAVE_ADDR; |
| if (reg_val & QUP_I2C_FAILED_MASK) |
| return QUP_ERR_I2C_FAILED; |
| if (reg_val & QUP_I2C_ARB_LOST) |
| return QUP_ERR_I2C_ARB_LOST; |
| if (reg_val & QUP_I2C_BUS_ERROR) |
| return QUP_ERR_I2C_BUS_ERROR; |
| if (reg_val & QUP_I2C_INVALID_WRITE) |
| return QUP_ERR_I2C_INVALID_WRITE; |
| if (reg_val & QUP_I2C_PACKET_NACK) |
| return QUP_ERR_I2C_NACK; |
| if (reg_val & QUP_I2C_INVALID_TAG) |
| return QUP_ERR_I2C_INVALID_TAG; |
| |
| return QUP_SUCCESS; |
| } |
| |
| static int check_bit_state(uint32_t *reg, int wait_for) |
| { |
| unsigned int count = TIMEOUT_CNT; |
| |
| while ((read32(reg) & (QUP_STATE_VALID_MASK | QUP_STATE_MASK)) != |
| (QUP_STATE_VALID | wait_for)) { |
| if (count == 0) |
| return QUP_ERR_TIMEOUT; |
| count--; |
| } |
| |
| return QUP_SUCCESS; |
| } |
| |
| /* |
| * Check whether GSBIn_QUP State is valid |
| */ |
| static qup_return_t qup_wait_for_state(blsp_qup_id_t id, unsigned int wait_for) |
| { |
| return check_bit_state(QUP_ADDR(id, QUP_STATE), wait_for); |
| } |
| |
| qup_return_t qup_reset_i2c_master_status(blsp_qup_id_t id) |
| { |
| /* |
| * The I2C_STATUS is a status register. |
| * Writing any value clears the status bits. |
| */ |
| qup_write32(QUP_ADDR(id, QUP_I2C_MASTER_STATUS), 0); |
| return QUP_SUCCESS; |
| } |
| |
| static qup_return_t qup_reset_master_status(blsp_qup_id_t id) |
| { |
| qup_write32(QUP_ADDR(id, QUP_ERROR_FLAGS), 0x3C); |
| qup_write32(QUP_ADDR(id, QUP_ERROR_FLAGS_EN), 0x3C); |
| qup_reset_i2c_master_status(id); |
| return QUP_SUCCESS; |
| } |
| |
| static qup_return_t qup_fifo_wait_for(blsp_qup_id_t id, uint32_t status) |
| { |
| qup_return_t ret = QUP_ERR_UNDEFINED; |
| unsigned int count = TIMEOUT_CNT; |
| |
| while (!(read32(QUP_ADDR(id, QUP_OPERATIONAL)) & status)) { |
| ret = qup_i2c_master_status(id); |
| if (ret) |
| return ret; |
| if (count == 0) |
| return QUP_ERR_TIMEOUT; |
| count--; |
| } |
| |
| return QUP_SUCCESS; |
| } |
| |
| static qup_return_t qup_fifo_wait_while(blsp_qup_id_t id, uint32_t status) |
| { |
| qup_return_t ret = QUP_ERR_UNDEFINED; |
| unsigned int count = TIMEOUT_CNT; |
| |
| while (read32(QUP_ADDR(id, QUP_OPERATIONAL)) & status) { |
| ret = qup_i2c_master_status(id); |
| if (ret) |
| return ret; |
| if (count == 0) |
| return QUP_ERR_TIMEOUT; |
| count--; |
| } |
| |
| return QUP_SUCCESS; |
| } |
| |
| static inline uint32_t qup_i2c_create_output_tag(int stop, u8 data) |
| { |
| uint32_t tag; |
| |
| if (stop) |
| tag = QUP_I2C_STOP_SEQ | QUP_I2C_DATA(data); |
| else |
| tag = QUP_I2C_DATA_SEQ | QUP_I2C_DATA(data); |
| |
| return tag; |
| } |
| |
| static inline qup_return_t qup_i2c_write_fifo_flush(blsp_qup_id_t id) |
| { |
| qup_return_t ret = QUP_ERR_UNDEFINED; |
| |
| qup_write32(QUP_ADDR(id, QUP_OPERATIONAL), OUTPUT_SERVICE_FLAG); |
| |
| mdelay(4); /* TPM seems to need this */ |
| |
| ret = qup_fifo_wait_while(id, OUTPUT_FIFO_NOT_EMPTY); |
| if (ret) |
| return ret; |
| |
| ret = qup_i2c_master_status(id); |
| |
| if (ret) |
| printk(BIOS_DEBUG, "%s: error\n", __func__); |
| |
| return ret; |
| } |
| |
| static qup_return_t qup_i2c_write_fifo(blsp_qup_id_t id, qup_data_t *p_tx_obj, |
| uint8_t stop_seq) |
| { |
| qup_return_t ret = QUP_ERR_UNDEFINED; |
| uint8_t addr = p_tx_obj->p.iic.addr; |
| uint8_t *data_ptr = p_tx_obj->p.iic.data; |
| unsigned int data_len = p_tx_obj->p.iic.data_len; |
| unsigned int idx = 0; |
| uint32_t tag, *fifo = QUP_ADDR(id, QUP_OUTPUT_FIFO); |
| |
| qup_reset_master_status(id); |
| |
| qup_write32(QUP_ADDR(id, QUP_MX_OUTPUT_COUNT), data_len + 1); |
| |
| qup_set_state(id, QUP_STATE_RUN); |
| |
| /* |
| * Since UNPACK enable is set in io mode register, populate 2 tags |
| * for each fifo register. |
| * |
| * Create the first tag as follows, with the start tag and first byte |
| * of the data to be written |
| * +--------+--------+--------+--------+ |
| * | STOP / | data | START | ADDR | |
| * |DATA tag| byte | tag | << 1 | |
| * +--------+--------+--------+--------+ |
| * rest will be created in the following while loop. |
| */ |
| tag = qup_i2c_create_output_tag(data_len == 1 && stop_seq, |
| data_ptr[idx]); |
| tag = ((tag << 16) & 0xffff0000) | |
| (QUP_I2C_START_SEQ | QUP_I2C_ADDR(addr)); |
| data_len--; |
| idx++; |
| |
| qup_write32(fifo, tag); |
| |
| while (data_len) { |
| |
| tag = qup_i2c_create_output_tag(data_len == 1 && stop_seq, |
| data_ptr[idx]); |
| data_len--; |
| idx++; |
| |
| if (data_len) { |
| tag |= qup_i2c_create_output_tag( |
| data_len == 1 && stop_seq, |
| data_ptr[idx]) << 16; |
| data_len--; |
| idx++; |
| } |
| |
| qup_write32(fifo, tag); |
| |
| ret = qup_i2c_write_fifo_flush(id); |
| |
| if (ret) { |
| printk(QUPDBG "%s: error\n", __func__); |
| return ret; |
| } |
| } |
| |
| ret = qup_i2c_write_fifo_flush(id); |
| |
| qup_set_state(id, QUP_STATE_RESET); |
| |
| return ret; |
| } |
| |
| static qup_return_t qup_i2c_write(blsp_qup_id_t id, uint8_t mode, |
| qup_data_t *p_tx_obj, uint8_t stop_seq) |
| { |
| qup_return_t ret = QUP_ERR_UNDEFINED; |
| |
| switch (mode) { |
| case QUP_MODE_FIFO: |
| case QUP_MODE_BLOCK: |
| ret = qup_i2c_write_fifo(id, p_tx_obj, stop_seq); |
| break; |
| default: |
| ret = QUP_ERR_UNSUPPORTED; |
| } |
| |
| if (ret) { |
| qup_set_state(id, QUP_STATE_RESET); |
| printk(QUPDBG "%s() failed (%d)\n", __func__, ret); |
| } |
| |
| return ret; |
| } |
| |
| static int qup_i2c_parse_tag(uint32_t data, uint8_t *data_ptr, uint32_t len) |
| { |
| int i, idx = 0; |
| int max = (len > 2) ? 2 : len; |
| |
| for (i = 0; i < max; i++) { |
| switch (QUP_I2C_MI_TAG(data)) { |
| case QUP_I2C_MIDATA_SEQ: |
| data_ptr[idx] = QUP_I2C_DATA(data); |
| idx++; |
| break; |
| case QUP_I2C_MISTOP_SEQ: |
| data_ptr[idx] = QUP_I2C_DATA(data); |
| idx++; |
| return idx; |
| default: |
| printk(QUPDBG "%s: Unexpected tag (0x%x)\n", __func__, |
| QUP_I2C_MI_TAG(data)); |
| return -1; |
| } |
| |
| data = (data >> 16); |
| } |
| |
| return idx; |
| } |
| |
| static qup_return_t qup_i2c_read_fifo(blsp_qup_id_t id, qup_data_t *p_tx_obj) |
| { |
| qup_return_t ret = QUP_ERR_UNDEFINED; |
| uint8_t addr = p_tx_obj->p.iic.addr; |
| uint8_t *data_ptr = p_tx_obj->p.iic.data; |
| unsigned int data_len = p_tx_obj->p.iic.data_len; |
| unsigned int idx = 0; |
| uint32_t *fifo = QUP_ADDR(id, QUP_OUTPUT_FIFO); |
| |
| qup_reset_master_status(id); |
| |
| qup_write32(QUP_ADDR(id, QUP_IO_MODES), |
| QUP_UNPACK_EN | QUP_PACK_EN | |
| ((QUP_MODE_BLOCK & QUP_MODE_MASK) << |
| QUP_OUTPUT_MODE_SHFT) | |
| ((QUP_MODE_BLOCK & QUP_MODE_MASK) << |
| QUP_INPUT_MODE_SHFT)); |
| |
| qup_write32(QUP_ADDR(id, QUP_MX_INPUT_COUNT), data_len); |
| |
| qup_set_state(id, QUP_STATE_RUN); |
| |
| qup_write32(fifo, (QUP_I2C_START_SEQ | |
| (QUP_I2C_ADDR(addr) | QUP_I2C_SLAVE_READ)) | |
| ((QUP_I2C_RECV_SEQ | data_len) << 16)); |
| |
| ret = qup_i2c_write_fifo_flush(id); |
| if (ret) { |
| printk(QUPDBG "%s: OUTPUT_FIFO_NOT_EMPTY\n", __func__); |
| return ret; |
| } |
| |
| ret = qup_fifo_wait_for(id, INPUT_SERVICE_FLAG); |
| if (ret) { |
| printk(QUPDBG "%s: INPUT_SERVICE_FLAG\n", __func__); |
| return ret; |
| } |
| |
| fifo = QUP_ADDR(id, QUP_INPUT_FIFO); |
| |
| while (data_len) { |
| uint32_t data; |
| int count; |
| |
| data = read32(fifo); |
| mdelay(1); |
| |
| count = qup_i2c_parse_tag(data, data_ptr + idx, data_len); |
| |
| if (count < 0) { |
| printk(QUPDBG "%s: Cannot parse tag 0x%x\n", |
| __func__, data); |
| qup_set_state(id, QUP_STATE_PAUSE); |
| |
| return QUP_ERR_I2C_INVALID_TAG; |
| } |
| |
| idx += count; |
| data_len -= count; |
| |
| qup_write32(QUP_ADDR(id, QUP_OPERATIONAL), INPUT_SERVICE_FLAG); |
| } |
| |
| p_tx_obj->p.iic.data_len = idx; |
| |
| qup_write32(QUP_ADDR(id, QUP_MX_READ_COUNT), 0); |
| |
| qup_set_state(id, QUP_STATE_RESET); |
| |
| return QUP_SUCCESS; |
| } |
| |
| static qup_return_t qup_i2c_read(blsp_qup_id_t id, uint8_t mode, |
| qup_data_t *p_tx_obj) |
| { |
| qup_return_t ret = QUP_ERR_UNDEFINED; |
| |
| qup_set_state(id, QUP_STATE_RESET); |
| |
| switch (mode) { |
| case QUP_MODE_FIFO: |
| case QUP_MODE_BLOCK: |
| ret = qup_i2c_read_fifo(id, p_tx_obj); |
| break; |
| default: |
| ret = QUP_ERR_UNSUPPORTED; |
| } |
| |
| if (ret) { |
| qup_set_state(id, QUP_STATE_RESET); |
| printk(QUPDBG "%s() failed (%d)\n", __func__, ret); |
| } |
| |
| return ret; |
| } |
| |
| qup_return_t qup_init(blsp_qup_id_t id, const qup_config_t *config_ptr) |
| { |
| qup_return_t ret = QUP_ERR_UNDEFINED; |
| uint32_t reg_val; |
| |
| /* Reset the QUP core.*/ |
| qup_write32(QUP_ADDR(id, QUP_SW_RESET), 0x1); |
| |
| /* Wait till the reset takes effect */ |
| ret = qup_wait_for_state(id, QUP_STATE_RESET); |
| if (ret) |
| goto bailout; |
| |
| /* Reset the config */ |
| qup_write32(QUP_ADDR(id, QUP_CONFIG), 0); |
| |
| /* Program the config register */ |
| /* Set N value */ |
| reg_val = 0x0F; |
| /* Set protocol */ |
| switch (config_ptr->protocol) { |
| case QUP_MINICORE_I2C_MASTER: |
| reg_val |= ((config_ptr->protocol & |
| QUP_MINI_CORE_PROTO_MASK) << |
| QUP_MINI_CORE_PROTO_SHFT); |
| break; |
| default: |
| ret = QUP_ERR_UNSUPPORTED; |
| goto bailout; |
| } |
| reg_val |= QUP_APP_CLK_ON_EN | QUP_CORE_CLK_ON_EN; |
| qup_write32(QUP_ADDR(id, QUP_CONFIG), reg_val); |
| |
| /* Choose version 1 tag */ |
| qup_write32(QUP_ADDR(id, QUP_I2C_MASTER_CONFIG), 0); |
| |
| /* Reset i2c clk cntl register */ |
| qup_write32(QUP_ADDR(id, QUP_I2C_MASTER_CLK_CTL), 0); |
| |
| /* Set QUP IO Mode */ |
| switch (config_ptr->mode) { |
| case QUP_MODE_FIFO: |
| case QUP_MODE_BLOCK: |
| reg_val = QUP_UNPACK_EN | QUP_PACK_EN | |
| ((config_ptr->mode & QUP_MODE_MASK) << |
| QUP_OUTPUT_MODE_SHFT) | |
| ((config_ptr->mode & QUP_MODE_MASK) << |
| QUP_INPUT_MODE_SHFT); |
| break; |
| default: |
| ret = QUP_ERR_UNSUPPORTED; |
| goto bailout; |
| } |
| qup_write32(QUP_ADDR(id, QUP_IO_MODES), reg_val); |
| |
| /*Set i2c clk cntl*/ |
| reg_val = (QUP_DIVIDER_MIN_VAL << QUP_HS_DIVIDER_SHFT); |
| reg_val |= ((((config_ptr->src_frequency / config_ptr->clk_frequency) |
| / 2) - QUP_DIVIDER_MIN_VAL) & |
| QUP_FS_DIVIDER_MASK); |
| qup_write32(QUP_ADDR(id, QUP_I2C_MASTER_CLK_CTL), reg_val); |
| |
| qup_set_state(id, QUP_STATE_RESET); |
| bailout: |
| if (ret) |
| printk(QUPDBG "failed to init qup (%d)\n", ret); |
| |
| return ret; |
| } |
| |
| qup_return_t qup_set_state(blsp_qup_id_t id, uint32_t state) |
| { |
| qup_return_t ret = QUP_ERR_UNDEFINED; |
| unsigned int curr_state = read32(QUP_ADDR(id, QUP_STATE)); |
| |
| if (state <= QUP_STATE_PAUSE && (curr_state & QUP_STATE_VALID_MASK)) { |
| /* |
| * For PAUSE_STATE to RESET_STATE transition, |
| * two writes of 10[binary]) are required for the |
| * transition to complete. |
| */ |
| if (QUP_STATE_PAUSE == curr_state && QUP_STATE_RESET == state) { |
| qup_write32(QUP_ADDR(id, QUP_STATE), 0x2); |
| qup_write32(QUP_ADDR(id, QUP_STATE), 0x2); |
| } else { |
| qup_write32(QUP_ADDR(id, QUP_STATE), state); |
| } |
| ret = qup_wait_for_state(id, state); |
| } |
| |
| return ret; |
| } |
| |
| static qup_return_t qup_i2c_send_data(blsp_qup_id_t id, qup_data_t *p_tx_obj, |
| uint8_t stop_seq) |
| { |
| qup_return_t ret = QUP_ERR_UNDEFINED; |
| uint8_t mode = (read32(QUP_ADDR(id, QUP_IO_MODES)) >> |
| QUP_OUTPUT_MODE_SHFT) & QUP_MODE_MASK; |
| |
| ret = qup_i2c_write(id, mode, p_tx_obj, stop_seq); |
| if (QUP_DEBUG) { |
| int i; |
| |
| printk(BIOS_DEBUG, "i2c tx bus %d device %2.2x:", |
| id, p_tx_obj->p.iic.addr); |
| for (i = 0; i < p_tx_obj->p.iic.data_len; i++) |
| printk(BIOS_DEBUG, " %2.2x", p_tx_obj->p.iic.data[i]); |
| printk(BIOS_DEBUG, "\n"); |
| } |
| |
| return ret; |
| } |
| |
| qup_return_t qup_send_data(blsp_qup_id_t id, qup_data_t *p_tx_obj, |
| uint8_t stop_seq) |
| { |
| qup_return_t ret = QUP_ERR_UNDEFINED; |
| |
| if (p_tx_obj->protocol == ((read32(QUP_ADDR(id, QUP_CONFIG)) >> |
| QUP_MINI_CORE_PROTO_SHFT) & QUP_MINI_CORE_PROTO_MASK)) { |
| switch (p_tx_obj->protocol) { |
| case QUP_MINICORE_I2C_MASTER: |
| ret = qup_i2c_send_data(id, p_tx_obj, stop_seq); |
| break; |
| default: |
| ret = QUP_ERR_UNSUPPORTED; |
| } |
| } |
| |
| return ret; |
| } |
| |
| static qup_return_t qup_i2c_recv_data(blsp_qup_id_t id, qup_data_t *p_rx_obj) |
| { |
| qup_return_t ret = QUP_ERR_UNDEFINED; |
| uint8_t mode = (read32(QUP_ADDR(id, QUP_IO_MODES)) >> |
| QUP_INPUT_MODE_SHFT) & QUP_MODE_MASK; |
| |
| ret = qup_i2c_read(id, mode, p_rx_obj); |
| if (QUP_DEBUG) { |
| int i; |
| |
| printk(BIOS_DEBUG, "i2c rxed on bus %d device %2.2x:", |
| id, p_rx_obj->p.iic.addr); |
| for (i = 0; i < p_rx_obj->p.iic.data_len; i++) |
| printk(BIOS_DEBUG, " %2.2x", p_rx_obj->p.iic.data[i]); |
| printk(BIOS_DEBUG, "\n"); |
| } |
| |
| return ret; |
| } |
| |
| qup_return_t qup_recv_data(blsp_qup_id_t id, qup_data_t *p_rx_obj) |
| { |
| qup_return_t ret = QUP_ERR_UNDEFINED; |
| |
| if (p_rx_obj->protocol == ((read32(QUP_ADDR(id, QUP_CONFIG)) >> |
| QUP_MINI_CORE_PROTO_SHFT) & QUP_MINI_CORE_PROTO_MASK)) { |
| switch (p_rx_obj->protocol) { |
| case QUP_MINICORE_I2C_MASTER: |
| ret = qup_i2c_recv_data(id, p_rx_obj); |
| break; |
| default: |
| ret = QUP_ERR_UNSUPPORTED; |
| } |
| } |
| |
| return ret; |
| } |