Changes between Initial Version and Version 1 of cma_driver

Timestamp:

Oct 8, 2014, 3:46:28 PM (10 years ago)

Author:

alain

Comment:

--

cma_driver

@@ +1 @@
+= GIET-VM / CMA Driver =
+
+The [source:soft/giet_vm/giet_drivers/cma_driver.c cma_driver.c] and [source:soft/giet_vm/giet_drivers/cma_driver.h cma_driver.h] files define the CMA driver. 
+
+It supports the SocLib ''vci_chbuf_dma'' component, that is a multi channels, chained buffer DMA controller.
+This component can be used in conjonction with the SocLib ''vci_frame_buffer'' to display images, or with the SocLib ''vci_multi_nic controller'' to transfer both RX and TX packets between NIC and memory buffers.
+
+The SEG_CMA_BASE address must be defined in the hard_config.h file
+
+All accesses to CMA registers are done by the two _cma_set_register() and _cma_get_register() low-level functions, that are handling the extended physical addresses.
+The higher level access functions are defined in the [wiki:fbf_driver fbf_driver] and [wiki:nic_driver nic_driver] files.
+
+The addressable registers map is defined [source:soft/giet_vm/giet_drivers/cma_driver.h here].
+
+ === unsigned int '''_cma_get_register'''( unsigned int channel,  unsigned int index ) ===
+This low_level function returns the value contained in register (index).
+
+ === void '''_cma_set_register'''( unsigned int channel,  unsigned int index,  unsigned int value ) ===
+This low_level function returns the value contained in register (index).
+
+ === void '''_cma_isr'''( unsigned int irq_type,  unsigned int irq_id,  unsigned int channel ) ===
+This Interrupt Service Routine handles the IRQ generated by a CMA channel.
+