SMB_LB_WR_ADDR_REG
coresight_simple_reg32(write_pos, SMB_LB_WR_ADDR_REG),
buf_wrptr = readl(drvdata->base + SMB_LB_WR_ADDR_REG) -
write_ptr = readl(drvdata->base + SMB_LB_WR_ADDR_REG);