| /* |
| * Copyright (c) 2012 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: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * 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. |
| * * Neither the name of The Linux Foundation nor the names of its |
| * contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER 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 <console/console.h> |
| #include <delay.h> |
| #include <gpio.h> |
| #include <soc/iomap.h> |
| #include <soc/spi.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| static const struct blsp_spi spi_reg[] = { |
| /* BLSP0 registers for SPI interface */ |
| { |
| BLSP0_SPI_CONFIG_REG, |
| BLSP0_SPI_IO_CONTROL_REG, |
| BLSP0_SPI_ERROR_FLAGS_REG, |
| BLSP0_SPI_ERROR_FLAGS_EN_REG, |
| BLSP0_QUP_CONFIG_REG, |
| BLSP0_QUP_ERROR_FLAGS_REG, |
| BLSP0_QUP_ERROR_FLAGS_EN_REG, |
| BLSP0_QUP_OPERATIONAL_REG, |
| BLSP0_QUP_IO_MODES_REG, |
| BLSP0_QUP_STATE_REG, |
| BLSP0_QUP_INPUT_FIFOc_REG(0), |
| BLSP0_QUP_OUTPUT_FIFOc_REG(0), |
| BLSP0_QUP_MX_INPUT_COUNT_REG, |
| BLSP0_QUP_MX_OUTPUT_COUNT_REG, |
| BLSP0_QUP_SW_RESET_REG, |
| 0, |
| 0, |
| BLSP0_QUP_OPERATIONAL_MASK, |
| BLSP0_SPI_DEASSERT_WAIT_REG, |
| }, |
| /* BLSP1 registers for SPI interface */ |
| { |
| BLSP1_SPI_CONFIG_REG, |
| BLSP1_SPI_IO_CONTROL_REG, |
| BLSP1_SPI_ERROR_FLAGS_REG, |
| BLSP1_SPI_ERROR_FLAGS_EN_REG, |
| BLSP1_QUP_CONFIG_REG, |
| BLSP1_QUP_ERROR_FLAGS_REG, |
| BLSP1_QUP_ERROR_FLAGS_EN_REG, |
| BLSP1_QUP_OPERATIONAL_REG, |
| BLSP1_QUP_IO_MODES_REG, |
| BLSP1_QUP_STATE_REG, |
| BLSP1_QUP_INPUT_FIFOc_REG(0), |
| BLSP1_QUP_OUTPUT_FIFOc_REG(0), |
| BLSP1_QUP_MX_INPUT_COUNT_REG, |
| BLSP1_QUP_MX_OUTPUT_COUNT_REG, |
| BLSP1_QUP_SW_RESET_REG, |
| 0, |
| 0, |
| BLSP1_QUP_OPERATIONAL_MASK, |
| BLSP1_SPI_DEASSERT_WAIT_REG, |
| }, |
| }; |
| |
| static int check_bit_state(void *reg_addr, int mask, |
| int val, int us_delay) |
| { |
| unsigned int count = TIMEOUT_CNT; |
| |
| while ((read32(reg_addr) & mask) != val) { |
| count--; |
| if (count == 0) |
| return -ETIMEDOUT; |
| udelay(us_delay); |
| } |
| |
| return SUCCESS; |
| } |
| |
| /* |
| * Check whether QUPn State is valid |
| */ |
| static int check_qup_state_valid(struct ipq_spi_slave *ds) |
| { |
| |
| return check_bit_state(ds->regs->qup_state, QUP_STATE_VALID_MASK, |
| QUP_STATE_VALID, 1); |
| |
| } |
| |
| /* |
| * Configure QUPn Core state |
| */ |
| static int config_spi_state(struct ipq_spi_slave *ds, unsigned int state) |
| { |
| uint32_t val; |
| int ret = SUCCESS; |
| |
| ret = check_qup_state_valid(ds); |
| if (ret != SUCCESS) |
| return ret; |
| |
| switch (state) { |
| case QUP_STATE_RUN: |
| /* Set the state to RUN */ |
| val = ((read32(ds->regs->qup_state) & ~QUP_STATE_MASK) |
| | QUP_STATE_RUN); |
| write32(ds->regs->qup_state, val); |
| ret = check_qup_state_valid(ds); |
| break; |
| case QUP_STATE_RESET: |
| /* Set the state to RESET */ |
| val = ((read32(ds->regs->qup_state) & ~QUP_STATE_MASK) |
| | QUP_STATE_RESET); |
| write32(ds->regs->qup_state, val); |
| ret = check_qup_state_valid(ds); |
| break; |
| default: |
| printk(BIOS_ERR, "unsupported QUP SPI state : %d\n", state); |
| ret = -EINVAL; |
| break; |
| } |
| |
| return ret; |
| } |
| |
| /* |
| * Set QUPn SPI Mode |
| */ |
| static void spi_set_mode(struct ipq_spi_slave *ds, unsigned int mode) |
| { |
| unsigned int clk_idle_state; |
| unsigned int input_first_mode; |
| uint32_t val; |
| |
| switch (mode) { |
| case SPI_MODE0: |
| clk_idle_state = 0; |
| input_first_mode = SPI_CONFIG_INPUT_FIRST; |
| break; |
| case SPI_MODE1: |
| clk_idle_state = 0; |
| input_first_mode = 0; |
| break; |
| case SPI_MODE2: |
| clk_idle_state = 1; |
| input_first_mode = SPI_CONFIG_INPUT_FIRST; |
| break; |
| case SPI_MODE3: |
| clk_idle_state = 1; |
| input_first_mode = 0; |
| break; |
| default: |
| printk(BIOS_ERR, "unsupported spi mode : %d\n", mode); |
| return; |
| } |
| |
| val = read32(ds->regs->spi_config); |
| val |= input_first_mode; |
| write32(ds->regs->spi_config, val); |
| |
| val = read32(ds->regs->io_control); |
| if (clk_idle_state) |
| val |= SPI_IO_CTRL_CLOCK_IDLE_HIGH; |
| else |
| val &= ~SPI_IO_CTRL_CLOCK_IDLE_HIGH; |
| |
| write32(ds->regs->io_control, val); |
| } |
| |
| /* |
| * Reset entire QUP and all mini cores |
| */ |
| static void spi_reset(struct ipq_spi_slave *ds) |
| { |
| write32(ds->regs->qup_sw_reset, 0x1); |
| udelay(5); |
| check_qup_state_valid(ds); |
| } |
| |
| static struct ipq_spi_slave spi_slave_pool[2]; |
| |
| void spi_init(void) |
| { |
| /* just in case */ |
| memset(spi_slave_pool, 0, sizeof(spi_slave_pool)); |
| } |
| |
| struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs) |
| { |
| struct ipq_spi_slave *ds = NULL; |
| int i; |
| |
| if ((bus < BLSP0_SPI) || (bus > BLSP1_SPI) |
| || ((bus == BLSP0_SPI) && (cs > 2)) |
| || ((bus == BLSP1_SPI) && (cs > 0))) { |
| printk(BIOS_ERR, |
| "SPI error: unsupported bus %d (Supported busses 0, 1 and 2) " |
| "or chipselect\n", bus); |
| return NULL; |
| } |
| |
| for (i = 0; i < ARRAY_SIZE(spi_slave_pool); i++) { |
| if (spi_slave_pool[i].allocated) |
| continue; |
| ds = spi_slave_pool + i; |
| ds->slave.bus = bus; |
| ds->slave.cs = cs; |
| ds->regs = &spi_reg[bus]; |
| |
| /* |
| * TODO(vbendeb): |
| * hardcoded frequency and mode - we might need to find a way |
| * to configure this |
| */ |
| ds->freq = 10000000; |
| ds->mode = SPI_MODE3; |
| ds->allocated = 1; |
| |
| return &ds->slave; |
| } |
| |
| printk(BIOS_ERR, "SPI error: all %d pools busy\n", i); |
| return NULL; |
| } |
| |
| /* |
| * BLSP QUPn SPI Hardware Initialisation |
| */ |
| static int spi_hw_init(struct ipq_spi_slave *ds) |
| { |
| int ret; |
| |
| ds->initialized = 0; |
| |
| /* QUPn module configuration */ |
| spi_reset(ds); |
| |
| /* Set the QUPn state */ |
| ret = config_spi_state(ds, QUP_STATE_RESET); |
| if (ret) |
| return ret; |
| |
| /* |
| * Configure Mini core to SPI core with Input Output enabled, |
| * SPI master, N = 8 bits |
| */ |
| clrsetbits_le32(ds->regs->qup_config, QUP_CONFIG_MINI_CORE_MSK | |
| QUP_CONF_INPUT_MSK | |
| QUP_CONF_OUTPUT_MSK | |
| QUP_CONF_N_MASK, |
| QUP_CONFIG_MINI_CORE_SPI | |
| QUP_CONF_INPUT_ENA | |
| QUP_CONF_OUTPUT_ENA | |
| QUP_CONF_N_SPI_8_BIT_WORD); |
| |
| /* |
| * Configure Input first SPI protocol, |
| * SPI master mode and no loopback |
| */ |
| clrsetbits_le32(ds->regs->spi_config, SPI_CONFIG_LOOP_BACK_MSK | |
| SPI_CONFIG_NO_SLAVE_OPER_MSK, |
| SPI_CONFIG_NO_LOOP_BACK | |
| SPI_CONFIG_NO_SLAVE_OPER); |
| |
| /* |
| * Configure SPI IO Control Register |
| * CLK_ALWAYS_ON = 0 |
| * MX_CS_MODE = 0 |
| * NO_TRI_STATE = 1 |
| */ |
| write32(ds->regs->io_control, SPI_IO_CTRL_CLK_ALWAYS_ON | |
| SPI_IO_CTRL_NO_TRI_STATE); |
| |
| /* |
| * Configure SPI IO Modes. |
| * OUTPUT_BIT_SHIFT_EN = 1 |
| * INPUT_MODE = Block Mode |
| * OUTPUT MODE = Block Mode |
| */ |
| clrsetbits_le32(ds->regs->qup_io_modes, |
| QUP_IO_MODES_OUTPUT_BIT_SHIFT_MSK | |
| QUP_IO_MODES_INPUT_MODE_MSK | |
| QUP_IO_MODES_OUTPUT_MODE_MSK, |
| QUP_IO_MODES_OUTPUT_BIT_SHIFT_EN | |
| QUP_IO_MODES_INPUT_BLOCK_MODE | |
| QUP_IO_MODES_OUTPUT_BLOCK_MODE); |
| |
| spi_set_mode(ds, ds->mode); |
| |
| /* Disable Error mask */ |
| write32(ds->regs->error_flags_en, 0); |
| write32(ds->regs->qup_error_flags_en, 0); |
| |
| write32(ds->regs->qup_deassert_wait, 0); |
| |
| ds->initialized = 1; |
| |
| return SUCCESS; |
| } |
| |
| int spi_claim_bus(struct spi_slave *slave) |
| { |
| struct ipq_spi_slave *ds = to_ipq_spi(slave); |
| unsigned int ret; |
| |
| ret = spi_hw_init(ds); |
| if (ret) |
| return -EIO; |
| |
| return SUCCESS; |
| } |
| |
| void spi_release_bus(struct spi_slave *slave) |
| { |
| struct ipq_spi_slave *ds = to_ipq_spi(slave); |
| |
| /* Reset the SPI hardware */ |
| spi_reset(ds); |
| ds->initialized = 0; |
| } |
| |
| static void write_force_cs(struct spi_slave *slave, int assert) |
| { |
| struct ipq_spi_slave *ds = to_ipq_spi(slave); |
| |
| if (assert) |
| clrsetbits_le32(ds->regs->io_control, |
| SPI_IO_CTRL_FORCE_CS_MSK, SPI_IO_CTRL_FORCE_CS_EN); |
| else |
| clrsetbits_le32(ds->regs->io_control, |
| SPI_IO_CTRL_FORCE_CS_MSK, SPI_IO_CTRL_FORCE_CS_DIS); |
| |
| return; |
| } |
| |
| /* |
| * Function to write data to OUTPUT FIFO |
| */ |
| static void spi_write_byte(struct ipq_spi_slave *ds, unsigned char data) |
| { |
| /* Wait for space in the FIFO */ |
| while ((read32(ds->regs->qup_operational) & OUTPUT_FIFO_FULL)) |
| udelay(1); |
| |
| /* Write the byte of data */ |
| write32(ds->regs->qup_output_fifo, data); |
| } |
| |
| /* |
| * Function to read data from Input FIFO |
| */ |
| static unsigned char spi_read_byte(struct ipq_spi_slave *ds) |
| { |
| /* Wait for Data in FIFO */ |
| while (!(read32(ds->regs->qup_operational) & INPUT_FIFO_NOT_EMPTY)) |
| udelay(1); |
| |
| /* Read a byte of data */ |
| return read32(ds->regs->qup_input_fifo) & 0xff; |
| } |
| |
| /* |
| * Function to check wheather Input or Output FIFO |
| * has data to be serviced |
| */ |
| static int check_fifo_status(void *reg_addr) |
| { |
| unsigned int count = TIMEOUT_CNT; |
| unsigned int status_flag; |
| unsigned int val; |
| |
| do { |
| val = read32(reg_addr); |
| count--; |
| if (count == 0) |
| return -ETIMEDOUT; |
| status_flag = ((val & OUTPUT_SERVICE_FLAG) | |
| (val & INPUT_SERVICE_FLAG)); |
| } while (!status_flag); |
| |
| return SUCCESS; |
| } |
| |
| /* |
| * Function to configure Input and Output enable/disable |
| */ |
| static void enable_io_config(struct ipq_spi_slave *ds, |
| uint32_t write_cnt, uint32_t read_cnt) |
| { |
| |
| if (write_cnt) { |
| clrsetbits_le32(ds->regs->qup_config, |
| QUP_CONF_OUTPUT_MSK, QUP_CONF_OUTPUT_ENA); |
| } else { |
| clrsetbits_le32(ds->regs->qup_config, |
| QUP_CONF_OUTPUT_MSK, QUP_CONF_NO_OUTPUT); |
| } |
| |
| if (read_cnt) { |
| clrsetbits_le32(ds->regs->qup_config, |
| QUP_CONF_INPUT_MSK, QUP_CONF_INPUT_ENA); |
| } else { |
| clrsetbits_le32(ds->regs->qup_config, |
| QUP_CONF_INPUT_MSK, QUP_CONF_NO_INPUT); |
| } |
| |
| return; |
| } |
| |
| unsigned int spi_crop_chunk(unsigned int cmd_len, unsigned int buf_len) |
| { |
| return min(MAX_PACKET_COUNT, buf_len); |
| } |
| |
| /* |
| * Function to read bytes number of data from the Input FIFO |
| */ |
| static int __blsp_spi_read(struct ipq_spi_slave *ds, u8 *data_buffer, |
| unsigned int bytes) |
| { |
| uint32_t val; |
| unsigned int i; |
| unsigned int fifo_count; |
| int ret = SUCCESS; |
| int state_config; |
| |
| /* Configure no of bytes to read */ |
| state_config = config_spi_state(ds, QUP_STATE_RESET); |
| if (state_config) |
| return state_config; |
| |
| /* Configure input and output enable */ |
| enable_io_config(ds, 0, bytes); |
| |
| write32(ds->regs->qup_mx_input_count, bytes); |
| |
| state_config = config_spi_state(ds, QUP_STATE_RUN); |
| if (state_config) |
| return state_config; |
| |
| while (bytes) { |
| ret = check_fifo_status(ds->regs->qup_operational); |
| if (ret != SUCCESS) |
| goto out; |
| |
| val = read32(ds->regs->qup_operational); |
| if (val & INPUT_SERVICE_FLAG) { |
| /* |
| * acknowledge to hw that software will |
| * read input data |
| */ |
| val &= INPUT_SERVICE_FLAG; |
| write32(ds->regs->qup_operational, val); |
| |
| fifo_count = ((bytes > SPI_INPUT_BLOCK_SIZE) ? |
| SPI_INPUT_BLOCK_SIZE : bytes); |
| |
| for (i = 0; i < fifo_count; i++) { |
| *data_buffer = spi_read_byte(ds); |
| data_buffer++; |
| bytes--; |
| } |
| } |
| } |
| |
| out: |
| /* |
| * Put the SPI Core back in the Reset State |
| * to end the transfer |
| */ |
| (void)config_spi_state(ds, QUP_STATE_RESET); |
| return ret; |
| } |
| |
| static int blsp_spi_read(struct ipq_spi_slave *ds, u8 *data_buffer, |
| unsigned int bytes) |
| { |
| int length, ret; |
| |
| while (bytes) { |
| length = (bytes < MAX_COUNT_SIZE) ? bytes : MAX_COUNT_SIZE; |
| |
| ret = __blsp_spi_read(ds, data_buffer, length); |
| if (ret != SUCCESS) |
| return ret; |
| |
| data_buffer += length; |
| bytes -= length; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Function to write data to the Output FIFO |
| */ |
| static int __blsp_spi_write(struct ipq_spi_slave *ds, const u8 *cmd_buffer, |
| unsigned int bytes) |
| { |
| uint32_t val; |
| unsigned int i; |
| unsigned int write_len = bytes; |
| unsigned int read_len = bytes; |
| unsigned int fifo_count; |
| int ret = SUCCESS; |
| int state_config; |
| |
| state_config = config_spi_state(ds, QUP_STATE_RESET); |
| if (state_config) |
| return state_config; |
| |
| /* No of bytes to be written in Output FIFO */ |
| write32(ds->regs->qup_mx_output_count, bytes); |
| write32(ds->regs->qup_mx_input_count, bytes); |
| state_config = config_spi_state(ds, QUP_STATE_RUN); |
| if (state_config) |
| return state_config; |
| |
| /* Configure input and output enable */ |
| enable_io_config(ds, write_len, read_len); |
| |
| /* |
| * read_len considered to ensure that we read the dummy data for the |
| * write we performed. This is needed to ensure with WR-RD transaction |
| * to get the actual data on the subsequent read cycle that happens |
| */ |
| while (write_len || read_len) { |
| |
| ret = check_fifo_status(ds->regs->qup_operational); |
| if (ret != SUCCESS) |
| goto out; |
| |
| val = read32(ds->regs->qup_operational); |
| if (val & OUTPUT_SERVICE_FLAG) { |
| /* |
| * acknowledge to hw that software will write |
| * expected output data |
| */ |
| val &= OUTPUT_SERVICE_FLAG; |
| write32(ds->regs->qup_operational, val); |
| |
| if (write_len > SPI_OUTPUT_BLOCK_SIZE) |
| fifo_count = SPI_OUTPUT_BLOCK_SIZE; |
| else |
| fifo_count = write_len; |
| |
| for (i = 0; i < fifo_count; i++) { |
| /* Write actual data to output FIFO */ |
| spi_write_byte(ds, *cmd_buffer); |
| cmd_buffer++; |
| write_len--; |
| } |
| } |
| if (val & INPUT_SERVICE_FLAG) { |
| /* |
| * acknowledge to hw that software |
| * will read input data |
| */ |
| val &= INPUT_SERVICE_FLAG; |
| write32(ds->regs->qup_operational, val); |
| |
| if (read_len > SPI_INPUT_BLOCK_SIZE) |
| fifo_count = SPI_INPUT_BLOCK_SIZE; |
| else |
| fifo_count = read_len; |
| |
| for (i = 0; i < fifo_count; i++) { |
| /* Read dummy data for the data written */ |
| (void)spi_read_byte(ds); |
| |
| /* Decrement the read count after reading the |
| * dummy data from the device. This is to make |
| * sure we read dummy data before we write the |
| * data to fifo |
| */ |
| read_len--; |
| } |
| } |
| } |
| |
| out: |
| /* |
| * Put the SPI Core back in the Reset State |
| * to end the transfer |
| */ |
| (void)config_spi_state(ds, QUP_STATE_RESET); |
| |
| return ret; |
| } |
| |
| static int blsp_spi_write(struct ipq_spi_slave *ds, u8 *cmd_buffer, |
| unsigned int bytes) |
| { |
| int length, ret; |
| |
| while (bytes) { |
| length = (bytes < MAX_COUNT_SIZE) ? bytes : MAX_COUNT_SIZE; |
| |
| ret = __blsp_spi_write(ds, cmd_buffer, length); |
| if (ret != SUCCESS) |
| return ret; |
| |
| cmd_buffer += length; |
| bytes -= length; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * This function is invoked with either tx_buf or rx_buf. |
| * Calling this function with both null does a chip select change. |
| */ |
| int spi_xfer(struct spi_slave *slave, const void *dout, |
| unsigned out_bytes, void *din, unsigned in_bytes) |
| { |
| struct ipq_spi_slave *ds = to_ipq_spi(slave); |
| u8 *txp = (u8 *)dout; |
| u8 *rxp = (u8 *)din; |
| int ret; |
| |
| ret = config_spi_state(ds, QUP_STATE_RESET); |
| if (ret != SUCCESS) |
| return ret; |
| |
| write_force_cs(slave, 1); |
| |
| if (dout != NULL) { |
| ret = blsp_spi_write(ds, txp, (unsigned int) out_bytes); |
| if (ret != SUCCESS) |
| goto out; |
| } |
| |
| if (din != NULL) { |
| ret = blsp_spi_read(ds, rxp, in_bytes); |
| if (ret != SUCCESS) |
| goto out; |
| } |
| |
| out: |
| write_force_cs(slave, 0); |
| |
| /* |
| * Put the SPI Core back in the Reset State |
| * to end the transfer |
| */ |
| (void)config_spi_state(ds, QUP_STATE_RESET); |
| |
| return ret; |
| } |