diff options
| author | Vignesh Raghavendra <vigneshr@ti.com> | 2019-12-04 22:17:21 +0530 |
|---|---|---|
| committer | Joe Hershberger <joe.hershberger@ni.com> | 2019-12-09 09:47:43 -0600 |
| commit | 5e6d9ccde9cf700e19e0d783f1f671a1eb4a60fb (patch) | |
| tree | 1dda58fd65d436618231818ec63a34b28b9f17d8 /include/linux/soc | |
| parent | b8a4dd28f3b719d176fed5dc8d23a898463b072c (diff) | |
dma: ti: k3-udma: Implement dma_get_cfg() interface
Implement dma_get_cfg() interface to pass flow id information for DMA
clients to use. This is needed because on K3 SoCs, CPSW (ethernet) and
UDMA (DMA provider) support "flows" within a given RX DMA channel. This
allows different network packets to be segregated while using same RX
DMA channel. In order for basic ethernet to work, CPSW slave must be
aware of the flow ID allocated for the RX channel by the DMA driver.
This interface allows CPSW to query flow ID from DMA provider and
configure it in CPSW HW.
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
Diffstat (limited to 'include/linux/soc')
| -rw-r--r-- | include/linux/soc/ti/ti-udma.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/soc/ti/ti-udma.h b/include/linux/soc/ti/ti-udma.h index e9d4226c48d..04e354fb2d6 100644 --- a/include/linux/soc/ti/ti-udma.h +++ b/include/linux/soc/ti/ti-udma.h @@ -21,4 +21,23 @@ struct ti_udma_drv_packet_data { u32 dest_tag; }; +/** + * struct ti_udma_drv_chan_cfg_data - TI UDMA per channel specific + * configuration data + * + * @flow_id_base: Start index of flow ID allocated to this channel + * @flow_id_cnt: Number of flows allocated for this channel starting at + * flow_id_base + * + * TI UDMA channel specific data returned as part of dma_get_cfg() call + * from the DMA client driver. + */ +struct ti_udma_drv_chan_cfg_data { + u32 flow_id_base; + u32 flow_id_cnt; +}; + +/* TI UDMA specific flag IDs for dma_get_cfg() call */ +#define TI_UDMA_CHAN_PRIV_INFO 0 + #endif /* __TI_UDMA_H */ |