/**
* mei_txe_read - reads a message from the txe device.
*
* @dev: the device structure
* @buf: message buffer will be written
* @len: message size will be read
*
* returns -EINVAL on error wrong argument and 0 on success
*/
static int mei_txe_read(struct mei_device *dev,
unsigned char *buf, unsigned long len)
{
struct mei_txe_hw *hw = to_txe_hw(dev);
u32 i;
u32 *reg_buf = (u32 *)buf;
u32 rem = len & 0x3;
if (WARN_ON(!buf || !len))
return -EINVAL;
dev_dbg(&dev->pdev->dev,
"buffer-length = %lu buf[0]0x%08X\n",
len, mei_txe_out_data_read(dev, 0));
for (i = 0; i < len / 4; i++) {
/* skip header: index starts from 1 */
u32 reg = mei_txe_out_data_read(dev, i + 1);
dev_dbg(&dev->pdev->dev, "buf[%d] = 0x%08X\n", i, reg);
*reg_buf++ = reg;
}
if (rem) {
u32 reg = mei_txe_out_data_read(dev, i + 1);
memcpy(reg_buf, ®, rem);
}
mei_txe_output_ready_set(hw);
return 0;
}
/**
* mei_txe_hw_start - start the hardware after reset
*
* @dev: the device structure
*
* Return: 0 on success an error code otherwise
*/
static int mei_txe_hw_start(struct mei_device *dev)
{
struct mei_txe_hw *hw = to_txe_hw(dev);
int ret;
u32 hisr;
/* bring back interrupts */
mei_txe_intr_enable(dev);
ret = mei_txe_readiness_wait(dev);
if (ret < 0) {
dev_err(dev->dev, "waiting for readiness failed\n");
return ret;
}
/*
* If HISR.INT2_STS interrupt status bit is set then clear it.
*/
hisr = mei_txe_br_reg_read(hw, HISR_REG);
if (hisr & HISR_INT_2_STS)
mei_txe_br_reg_write(hw, HISR_REG, HISR_INT_2_STS);
/* Clear the interrupt cause of OutputDoorbell */
clear_bit(TXE_INTR_OUT_DB_BIT, &hw->intr_cause);
ret = mei_txe_aliveness_set_sync(dev, 1);
if (ret < 0) {
dev_err(dev->dev, "wait for aliveness failed ... bailing out\n");
return ret;
}
pm_runtime_set_active(dev->dev);
/* enable input ready interrupts:
* SEC_IPC_HOST_INT_MASK.IPC_INPUT_READY_INT_MASK
*/
mei_txe_input_ready_interrupt_enable(dev);
/* Set the SICR_SEC_IPC_OUTPUT_STATUS.IPC_OUTPUT_READY bit */
mei_txe_output_ready_set(hw);
/* Set bit SICR_HOST_IPC_READINESS.HOST_RDY
*/
mei_txe_readiness_set_host_rdy(dev);
return 0;
}
