diff options
| author | Koichiro Den <den@valinux.co.jp> | 2026-09-13 02:40:22 +0900 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2026-10-05 16:10:26 +0200 |
| commit | 9d31ad3b331d5d78bd6a247a9d35f35a6a9bbd59 (patch) | |
| tree | 87ecf1baaa9e39cb25c9e8082a03283271eb6bfb /include/linux | |
| parent | f54701da5c0562cefadc8b638c3c141111c10579 (diff) | |
dmaengine: dw-edma: Configure remote interrupt routing
An endpoint function can reserve an endpoint-local channel while the RC
programs it through an exposed register window. Such a channel must route
interrupts remotely and ignore them on the endpoint.
Use dma_slave_config to set per-channel interrupt routing on idle channels
of a local eDMA or HDMA instance. Releasing a remote-routed channel
quiesces the hardware and drains its local IRQ before restoring default
routing.
The eDMA quiesce may stop a complete direction. The caller must own every
channel in that direction and stop remote programming first.
Suggested-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Koichiro Den <den@valinux.co.jp>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260912174023.1227397-3-den@valinux.co.jp
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/dma/edma.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/dma/edma.h b/include/linux/dma/edma.h index affd896563a1..eead04b805e7 100644 --- a/include/linux/dma/edma.h +++ b/include/linux/dma/edma.h @@ -101,6 +101,27 @@ enum dw_edma_ch_irq_mode { DW_EDMA_CH_IRQ_REMOTE, }; +#define DW_EDMA_CH_CONFIG_NON_LL BIT(0) +#define DW_EDMA_CH_CONFIG_IRQ_MODE BIT(1) + +/** + * struct dw_edma_chan_config - dw-edma channel configuration + * @flags: fields selected by DW_EDMA_CH_CONFIG_* + * @non_ll: use HDMA non-linked-list mode + * @irq_mode: interrupt routing mode + * + * Pass this structure through dma_slave_config.peripheral_config. Before + * synchronizing a remote-routed channel, the client must stop remote + * programming and own every channel affected by the hardware quiesce: the + * entire direction for eDMA-compatible layouts, or the individual channel for + * native HDMA. + */ +struct dw_edma_chan_config { + u32 flags; + bool non_ll; + enum dw_edma_ch_irq_mode irq_mode; +}; + /** * struct dw_edma_chip - representation of DesignWare eDMA controller hardware * @dev: struct device of the eDMA controller |