Changes between Version 3 and Version 4 of mwr_driver

Timestamp:

Feb 28, 2015, 7:36:04 PM (11 years ago)

Author:

alain

Comment:

--

mwr_driver

@@ -8 +8 @@
 The vci_mwmr_dma component is a multi-channels hardware component that can be used to connect an hardware coprocesseur to a VCI interconnect.
 This component provides the coprocessor one or several TO_COPROC or FROM_COPROC FIFO type communication channels, without address.
-Each T0_COPROC/FROM coproc port contains an hardware FIFO interface (data, r_wok, w_rok signals), plus three signals (REQ, ACK, BURSTS) allowing the coprocessor
-to request an integer number of data burst. Each burst contains a fixed number of 32 bits words. Each channel implements two running modes:
+Each T0_COPROC/FROM_COPROC port contains an hardware FIFO interface (DATA, R_WOK, W_ROK signals), plus three signals (REQ, ACK, BURSTS) allowing the coprocessor
+to request an integer number of data burst. Each burst contains a fixed number of 32 bits words. The burst length is an hardware parameter.
+
+Each channel implements two running modes:
  * in '''MWMR''' mode the channel FSM transfer an infinite" stream of data to or from a MWMR software FIFO, implementing the 7 steps MWMR protocol.
- * in '''DMA''' mode the channel FSM transfer a fixed size chunk of data to or from a memory buffer, with a completion signaling interrupt.
+ * in '''DMA''' mode the channel FSM transfer a fixed size chunk of data to or from a memory buffer, with an optional completion signaling interrupt.
 
-It is an ''internal'' peripheral, even if it is not replicated in all clusters. 
+It is an ''internal'' peripheral, that can be replicated in all clusters. 
 
-WARNING : The MWR driver is not available yet.
+The addressable registers map and command codes are defined [source:soft/giet_vm/giet_drivers/mwr_driver.h here].
+
+ === void '''_mwr_channel_init'''( unsigned int cluster_xy, unsigned int channel, unsigned int mode, unsigned long long buffer_paddr, unsigned int buffer_size, unsigned long long desc_paddr, unsigned long long lock_paddr ) ===
+This function initialises all registers defining one communication channel for a given coprocessor.
+ * '''cluster_xy''' is the cluster index
+ * '''channel''' is the channel index
+ * '''mode''' is the requested mode (MWMR / DMA_IRQ / DMA_NO_IRQ)
+ * '''buffer_paddr''' is the memory buffer physical address
+ * '''buffer_size''' is the memory buffer size (bytes)
+ * '''desc_paddr''' is the MWMR descriptor physical address (only used in MWMR mode)
+ * '''lock_paddr''' is the MWMR lock physical address (only used in MWMR mode)
+
+ === void '''_mwr_channel_start'''( unsigned int cluster_xy,  unsigned int channel ) ===
+This function activates one communication channel for a given coprocessor.
+ * '''cluster_xy''' is the cluster index
+ * '''channel''' is the channel index
+
+ === void '''_mwr_channel_stop'''( unsigned int cluster_xy,  unsigned int channel ) ===
+This function desactivates one communication channel for a given coprocessor.
+ * '''cluster_xy''' is the cluster index
+ * '''channel''' is the channel index