| Viresh Kumar | d3f797d | 2012-04-20 20:15:34 +0530 | [diff] [blame] | 1 | * Synopsys Designware DMA Controller |
| 2 | |
| 3 | Required properties: |
| 4 | - compatible: "snps,dma-spear1340" |
| 5 | - reg: Address range of the DMAC registers |
| 6 | - interrupt-parent: Should be the phandle for the interrupt controller |
| 7 | that services interrupts for this device |
| 8 | - interrupt: Should contain the DMAC interrupt number |
| Viresh Kumar | a9ddb57 | 2012-10-16 09:49:17 +0530 | [diff] [blame^] | 9 | - nr_channels: Number of channels supported by hardware |
| 10 | - is_private: The device channels should be marked as private and not for by the |
| 11 | general purpose DMA channel allocator. False if not passed. |
| 12 | - chan_allocation_order: order of allocation of channel, 0 (default): ascending, |
| 13 | 1: descending |
| 14 | - chan_priority: priority of channels. 0 (default): increase from chan 0->n, 1: |
| 15 | increase from chan n->0 |
| 16 | - block_size: Maximum block size supported by the controller |
| 17 | - nr_masters: Number of AHB masters supported by the controller |
| 18 | - data_width: Maximum data width supported by hardware per AHB master |
| 19 | (0 - 8bits, 1 - 16bits, ..., 5 - 256bits) |
| 20 | - slave_info: |
| 21 | - bus_id: name of this device channel, not just a device name since |
| 22 | devices may have more than one channel e.g. "foo_tx". For using the |
| 23 | dw_generic_filter(), slave drivers must pass exactly this string as |
| 24 | param to filter function. |
| 25 | - cfg_hi: Platform-specific initializer for the CFG_HI register |
| 26 | - cfg_lo: Platform-specific initializer for the CFG_LO register |
| 27 | - src_master: src master for transfers on allocated channel. |
| 28 | - dst_master: dest master for transfers on allocated channel. |
| Viresh Kumar | d3f797d | 2012-04-20 20:15:34 +0530 | [diff] [blame] | 29 | |
| 30 | Example: |
| 31 | |
| 32 | dma@fc000000 { |
| 33 | compatible = "snps,dma-spear1340"; |
| 34 | reg = <0xfc000000 0x1000>; |
| 35 | interrupt-parent = <&vic1>; |
| 36 | interrupts = <12>; |
| Viresh Kumar | a9ddb57 | 2012-10-16 09:49:17 +0530 | [diff] [blame^] | 37 | |
| 38 | nr_channels = <8>; |
| 39 | chan_allocation_order = <1>; |
| 40 | chan_priority = <1>; |
| 41 | block_size = <0xfff>; |
| 42 | nr_masters = <2>; |
| 43 | data_width = <3 3 0 0>; |
| 44 | |
| 45 | slave_info { |
| 46 | uart0-tx { |
| 47 | bus_id = "uart0-tx"; |
| 48 | cfg_hi = <0x4000>; /* 0x8 << 11 */ |
| 49 | cfg_lo = <0>; |
| 50 | src_master = <0>; |
| 51 | dst_master = <1>; |
| 52 | }; |
| 53 | spi0-tx { |
| 54 | bus_id = "spi0-tx"; |
| 55 | cfg_hi = <0x2000>; /* 0x4 << 11 */ |
| 56 | cfg_lo = <0>; |
| 57 | src_master = <0>; |
| 58 | dst_master = <0>; |
| 59 | }; |
| 60 | }; |
| Viresh Kumar | d3f797d | 2012-04-20 20:15:34 +0530 | [diff] [blame] | 61 | }; |