diff --git a/include/linux/dma/qcom_bam_dma.h b/include/linux/dma/qcom_bam_dma.h new file mode 100644 index 000000000000..077d43a358e5 --- /dev/null +++ b/include/linux/dma/qcom_bam_dma.h @@ -0,0 +1,79 @@ +/* + * Copyright (c) 2016-2017, The Linux Foundation. All rights reserved. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef _QCOM_BAM_DMA_H +#define _QCOM_BAM_DMA_H + +#include + +/* + * This data type corresponds to the native Command Element + * supported by BAM DMA Engine. + * + * @cmd_and_addr - upper 8 bits command and lower 24 bits register address. + * @data - for write command: content to be written into peripheral register. + * for read command: dest addr to write peripheral register value. + * @mask - register mask. + * @reserved - for future usage. + * + */ +struct bam_cmd_element { + __le32 cmd_and_addr; + __le32 data; + __le32 mask; + __le32 reserved; +}; + +/* + * This enum indicates the command type in a command element + */ +enum bam_command_type { + BAM_WRITE_COMMAND = 0, + BAM_READ_COMMAND, +}; + +/* + * prep_bam_ce_le32 - Wrapper function to prepare a single BAM command + * element with the data already in le32 format. + * + * @bam_ce: bam command element + * @addr: target address + * @cmd: BAM command + * @data: actual data for write and dest addr for read in le32 + */ +static inline void +bam_prep_ce_le32(struct bam_cmd_element *bam_ce, u32 addr, + enum bam_command_type cmd, __le32 data) +{ + bam_ce->cmd_and_addr = + cpu_to_le32((addr & 0xffffff) | ((cmd & 0xff) << 24)); + bam_ce->data = data; + bam_ce->mask = cpu_to_le32(0xffffffff); +} + +/* + * bam_prep_ce - Wrapper function to prepare a single BAM command element + * with the data. + * + * @bam_ce: BAM command element + * @addr: target address + * @cmd: BAM command + * @data: actual data for write and dest addr for read + */ +static inline void +bam_prep_ce(struct bam_cmd_element *bam_ce, u32 addr, + enum bam_command_type cmd, u32 data) +{ + bam_prep_ce_le32(bam_ce, addr, cmd, cpu_to_le32(data)); +} +#endif