| # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) |
| %YAML 1.2 |
| --- |
| $id: http://devicetree.org/schemas/dma/stericsson,dma40.yaml# |
| $schema: http://devicetree.org/meta-schemas/core.yaml# |
| |
| title: ST-Ericsson DMA40 DMA Engine |
| |
| maintainers: |
| - Linus Walleij <linus.walleij@linaro.org> |
| |
| allOf: |
| - $ref: "dma-controller.yaml#" |
| |
| properties: |
| "#dma-cells": |
| const: 3 |
| description: | |
| The first cell is the unique device channel number as indicated by this |
| table for DB8500 which is the only ASIC known to use DMA40: |
| |
| 0: SPI controller 0 |
| 1: SD/MMC controller 0 (unused) |
| 2: SD/MMC controller 1 (unused) |
| 3: SD/MMC controller 2 (unused) |
| 4: I2C port 1 |
| 5: I2C port 3 |
| 6: I2C port 2 |
| 7: I2C port 4 |
| 8: Synchronous Serial Port SSP0 |
| 9: Synchronous Serial Port SSP1 |
| 10: Multi-Channel Display Engine MCDE RX |
| 11: UART port 2 |
| 12: UART port 1 |
| 13: UART port 0 |
| 14: Multirate Serial Port MSP2 |
| 15: I2C port 0 |
| 16: USB OTG in/out endpoints 7 & 15 |
| 17: USB OTG in/out endpoints 6 & 14 |
| 18: USB OTG in/out endpoints 5 & 13 |
| 19: USB OTG in/out endpoints 4 & 12 |
| 20: SLIMbus or HSI channel 0 |
| 21: SLIMbus or HSI channel 1 |
| 22: SLIMbus or HSI channel 2 |
| 23: SLIMbus or HSI channel 3 |
| 24: Multimedia DSP SXA0 |
| 25: Multimedia DSP SXA1 |
| 26: Multimedia DSP SXA2 |
| 27: Multimedia DSP SXA3 |
| 28: SD/MMC controller 2 |
| 29: SD/MMC controller 0 |
| 30: MSP port 1 on DB8500 v1, MSP port 3 on DB8500 v2 |
| 31: MSP port 0 or SLIMbus channel 0 |
| 32: SD/MMC controller 1 |
| 33: SPI controller 2 |
| 34: i2c3 RX2 TX2 |
| 35: SPI controller 1 |
| 36: USB OTG in/out endpoints 3 & 11 |
| 37: USB OTG in/out endpoints 2 & 10 |
| 38: USB OTG in/out endpoints 1 & 9 |
| 39: USB OTG in/out endpoints 8 |
| 40: SPI controller 3 |
| 41: SD/MMC controller 3 |
| 42: SD/MMC controller 4 |
| 43: SD/MMC controller 5 |
| 44: Multimedia DSP SXA4 |
| 45: Multimedia DSP SXA5 |
| 46: SLIMbus channel 8 or Multimedia DSP SXA6 |
| 47: SLIMbus channel 9 or Multimedia DSP SXA7 |
| 48: Crypto Accelerator 1 |
| 49: Crypto Accelerator 1 TX or Hash Accelerator 1 TX |
| 50: Hash Accelerator 1 TX |
| 51: memcpy TX (to be used by the DMA driver for memcpy operations) |
| 52: SLIMbus or HSI channel 4 |
| 53: SLIMbus or HSI channel 5 |
| 54: SLIMbus or HSI channel 6 |
| 55: SLIMbus or HSI channel 7 |
| 56: memcpy (to be used by the DMA driver for memcpy operations) |
| 57: memcpy (to be used by the DMA driver for memcpy operations) |
| 58: memcpy (to be used by the DMA driver for memcpy operations) |
| 59: memcpy (to be used by the DMA driver for memcpy operations) |
| 60: memcpy (to be used by the DMA driver for memcpy operations) |
| 61: Crypto Accelerator 0 |
| 62: Crypto Accelerator 0 TX or Hash Accelerator 0 TX |
| 63: Hash Accelerator 0 TX |
| |
| The second cell is the DMA request line number. This is only used when |
| a fixed channel is allocated, and indicated by setting bit 3 in the |
| flags field (see below). |
| |
| The third cell is a 32bit flags bitfield with the following possible |
| bits set: |
| 0x00000001 (bit 0) - mode: |
| Logical channel when unset |
| Physical channel when set |
| 0x00000002 (bit 1) - direction: |
| Memory to Device when unset |
| Device to Memory when set |
| 0x00000004 (bit 2) - endianness: |
| Little endian when unset |
| Big endian when set |
| 0x00000008 (bit 3) - use fixed channel: |
| Use automatic channel selection when unset |
| Use DMA request line number when set |
| 0x00000010 (bit 4) - set channel as high priority: |
| Normal priority when unset |
| High priority when set |
| |
| compatible: |
| items: |
| - const: stericsson,db8500-dma40 |
| - const: stericsson,dma40 |
| |
| reg: |
| items: |
| - description: DMA40 memory base |
| - description: LCPA memory base |
| |
| reg-names: |
| items: |
| - const: base |
| - const: lcpa |
| |
| interrupts: |
| maxItems: 1 |
| |
| clocks: |
| maxItems: 1 |
| |
| memcpy-channels: |
| $ref: /schemas/types.yaml#/definitions/uint32-array |
| description: Array of u32 elements indicating which channels on the DMA |
| engine are elegible for memcpy transfers |
| |
| required: |
| - "#dma-cells" |
| - compatible |
| - reg |
| - interrupts |
| - clocks |
| - memcpy-channels |
| |
| additionalProperties: false |
| |
| examples: |
| - | |
| #include <dt-bindings/interrupt-controller/irq.h> |
| #include <dt-bindings/interrupt-controller/arm-gic.h> |
| #include <dt-bindings/mfd/dbx500-prcmu.h> |
| dma-controller@801C0000 { |
| compatible = "stericsson,db8500-dma40", "stericsson,dma40"; |
| reg = <0x801C0000 0x1000>, <0x40010000 0x800>; |
| reg-names = "base", "lcpa"; |
| interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>; |
| #dma-cells = <3>; |
| memcpy-channels = <56 57 58 59 60>; |
| clocks = <&prcmu_clk PRCMU_DMACLK>; |
| }; |
| ... |
