diff options
Diffstat (limited to 'src/soc/intel/quark/gpio_i2c.c')
| -rw-r--r-- | src/soc/intel/quark/gpio_i2c.c | 152 |
1 files changed, 0 insertions, 152 deletions
diff --git a/src/soc/intel/quark/gpio_i2c.c b/src/soc/intel/quark/gpio_i2c.c index d23a90553c..5580894ee1 100644 --- a/src/soc/intel/quark/gpio_i2c.c +++ b/src/soc/intel/quark/gpio_i2c.c @@ -23,158 +23,6 @@ #include <soc/ramstage.h> #include <soc/reg_access.h> -static void i2c_disable(I2C_REGS *regs) -{ - uint32_t status; - uint32_t timeout; - - /* Disable I2C controller */ - regs->ic_enable = 0; - - /* Wait for the enable bit to clear */ - timeout = 1 * 1000 * 1000; - status = regs->ic_enable_status; - while (status & IC_ENABLE_CONTROLLER) { - udelay(1); - if (--timeout == 0) - die("ERROR - I2C failed to disable!\n"); - status = regs->ic_enable_status; - } - - /* Clear any pending interrupts */ - status = regs->ic_clr_intr; -} - -int platform_i2c_transfer(unsigned bus, struct i2c_seg *segments, int count) -{ - uint8_t *buffer; - int bytes_transferred; - uint8_t chip; - uint32_t cmd; - int length; - int read_length; - I2C_REGS *regs; - uint32_t status; - uint32_t timeout; - - regs = get_i2c_address(); - - /* Disable the I2C controller to get access to the registers */ - i2c_disable(regs); - - /* Set the slave address */ - ASSERT (count > 0); - ASSERT (segments != NULL); - ASSERT (segments->read == 0); - - /* Clear the start and stop detection */ - status = regs->ic_clr_start_det; - status = regs->ic_clr_stop_det; - - /* Set addressing mode to 7-bit and fast mode */ - cmd = regs->ic_con; - cmd &= ~(IC_CON_10B | IC_CON_SPEED); - cmd |= IC_CON_RESTART_EN | IC_CON_7B | IC_CON_SPEED_100_KHz - | IC_CON_MASTER_MODE; - regs->ic_con = cmd; - - /* Set the target chip address */ - chip = segments->chip; - regs->ic_tar = chip; - - /* Enable the I2C controller */ - regs->ic_enable = IC_ENABLE_CONTROLLER; - - /* Clear the interrupts */ - status = regs->ic_clr_rx_under; - status = regs->ic_clr_rx_over; - status = regs->ic_clr_tx_over; - status = regs->ic_clr_tx_abrt; - - /* Process each of the segments */ - bytes_transferred = 0; - read_length = 0; - buffer = NULL; - while (count-- > 0) { - buffer = segments->buf; - length = segments->len; - ASSERT (buffer != NULL); - ASSERT (length >= 1); - ASSERT (segments->chip = chip); - - if (segments->read) { - /* Place read commands into the FIFO */ - read_length = length; - while (length > 0) { - /* Send stop bit after last byte */ - cmd = IC_DATA_CMD_READ; - if ((count == 0) && (length == 1)) - cmd |= IC_DATA_CMD_STOP; - - /* Place read command in transmit FIFO */ - regs->ic_data_cmd = cmd; - length--; - } - } else { - /* Write the data into the FIFO */ - while (length > 0) { - /* End of the transaction? */ - cmd = IC_DATA_CMD_WRITE | *buffer++; - if ((count == 0) && (length == 1)) - cmd |= IC_DATA_CMD_STOP; - - /* Place a data byte into the FIFO */ - regs->ic_data_cmd = cmd; - length--; - bytes_transferred++; - } - } - segments++; - } - - /* Wait for the end of the transaction */ - timeout = 1 * 1000 * 1000; - do { - status = regs->ic_raw_intr_stat; - if (status & IC_INTR_STOP_DET) - break; - if ((status & (IC_INTR_RX_OVER | IC_INTR_RX_UNDER - | IC_INTR_TX_ABRT | IC_INTR_TX_OVER)) - || (timeout == 0)) { - if (timeout == 0) - printk (BIOS_ERR, - "ERROR - I2C stop bit not received!\n"); - if (status & IC_INTR_RX_OVER) - printk (BIOS_ERR, - "ERROR - I2C receive overrun!\n"); - if (status & IC_INTR_RX_UNDER) - printk (BIOS_ERR, - "ERROR - I2C receive underrun!\n"); - if (status & IC_INTR_TX_ABRT) - printk (BIOS_ERR, - "ERROR - I2C transmit abort!\n"); - if (status & IC_INTR_TX_OVER) - printk (BIOS_ERR, - "ERROR - I2C transmit overrun!\n"); - i2c_disable(regs); - return -1; - } - timeout--; - udelay(1); - } while(1); - - /* Finish reading the data bytes */ - while (read_length > 0) { - status = regs->ic_status; - *buffer++ = (UINT8)regs->ic_data_cmd; - read_length--; - bytes_transferred++; - status = regs->ic_status; - } - - return bytes_transferred; -} - __attribute__((weak)) void mainboard_gpio_i2c_init(device_t dev) { /* Initialize any of the GPIOs or I2C devices */ |