On Fri, May 6, 2022 at 4:16 AM Ricardo Martinez <ricardo.martinez@xxxxxxxxxxxxxxx> wrote: > Cross Layer DMA (CLDMA) Hardware interface (HIF) enables the control > path of Host-Modem data transfers. CLDMA HIF layer provides a common > interface to the Port Layer. > > CLDMA manages 8 independent RX/TX physical channels with data flow > control in HW queues. CLDMA uses ring buffers of General Packet > Descriptors (GPD) for TX/RX. GPDs can represent multiple or single > data buffers (DB). > > CLDMA HIF initializes GPD rings, registers ISR handlers for CLDMA > interrupts, and initializes CLDMA HW registers. > > CLDMA TX flow: > 1. Port Layer write > 2. Get DB address > 3. Configure GPD > 4. Triggering processing via HW register write > > CLDMA RX flow: > 1. CLDMA HW sends a RX "done" to host > 2. Driver starts thread to safely read GPD > 3. DB is sent to Port layer > 4. Create a new buffer for GPD ring > > Note: This patch does not enable compilation since it has dependencies > such as t7xx_pcie_mac_clear_int()/t7xx_pcie_mac_set_int() and > struct t7xx_pci_dev which are added by the core patch. > > Signed-off-by: Haijun Liu <haijun.liu@xxxxxxxxxxxx> > Signed-off-by: Chandrashekar Devegowda <chandrashekar.devegowda@xxxxxxxxx> > Co-developed-by: Ricardo Martinez <ricardo.martinez@xxxxxxxxxxxxxxx> > Signed-off-by: Ricardo Martinez <ricardo.martinez@xxxxxxxxxxxxxxx> > Reviewed-by: Loic Poulain <loic.poulain@xxxxxxxxxx> > Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx> Reviewed-by: Sergey Ryazanov <ryazanov.s.a@xxxxxxxxx>
