Kernel-4.18.0-80.el8_ti-edma

published: updated: Kernel_4.18.0-80.el8_内核文档

Texas Instruments eDMA

The eDMA3 consists of two components: Channel controller (CC) and Transfer
Controller(s) (TC). The CC is the main entry for DMA users since it is
responsible for the DMA channel handling, while the TCs are responsible to
execute the actual DMA tansfer.

eDMA3 Channel Controller

Required properties:

  • compatible: Should be:
      - "ti,edma3-tpcc" for the channel controller(s) on OMAP,
    AM33xx and AM43xx SoCs.
  - "ti,k2g-edma3-tpcc", "ti,edma3-tpcc" for the
    channel controller(s) on 66AK2G.
  • #dma-cells: Should be set to <2>. The first number is the DMA request
      number and the second is the TC the channel is serviced on.
  • reg: Memory map of eDMA CC
  • reg-names: “edma3_cc”
  • interrupts: Interrupt lines for CCINT, MPERR and CCERRINT.
  • interrupt-names: “edma3_ccint”, “edma3_mperr” and “edma3_ccerrint”
  • ti,tptcs: List of TPTCs associated with the eDMA in the following form:
      <&tptc_phandle TC_priority_number>. The highest priority is 0.

SoC-specific Required properties:

The following are mandatory properties for OMAP, AM33xx and AM43xx SoCs only:

  • ti,hwmods: Name of the hwmods associated to the eDMA CC.

The following are mandatory properties for 66AK2G SoCs only:

  • power-domains:Should contain a phandle to a PM domain provider node
      and an args specifier containing the device id
  value. This property is as per the binding,
  Documentation/devicetree/bindings/soc/ti/sci-pm-domain.txt

Optional properties:

  • ti,edma-memcpy-channels: List of channels allocated to be used for memcpy, iow
      these channels will be SW triggered channels. See example.
  • ti,edma-reserved-slot-ranges: PaRAM slot ranges which should not be used by
      the driver, they are allocated to be used by for example the
  DSP. See example.

eDMA3 Transfer Controller

Required properties:

  • compatible: Should be:
      - "ti,edma3-tptc" for the transfer controller(s) on OMAP,
    AM33xx and AM43xx SoCs.
  - "ti,k2g-edma3-tptc", "ti,edma3-tptc" for the
    transfer controller(s) on 66AK2G.
  • reg: Memory map of eDMA TC
  • interrupts: Interrupt number for TCerrint.

SoC-specific Required properties:

The following are mandatory properties for OMAP, AM33xx and AM43xx SoCs only:

  • ti,hwmods: Name of the hwmods associated to the eDMA TC.

The following are mandatory properties for 66AK2G SoCs only:

  • power-domains:Should contain a phandle to a PM domain provider node
      and an args specifier containing the device id
  value. This property is as per the binding,
  Documentation/devicetree/bindings/soc/ti/sci-pm-domain.txt

Optional properties:

  • interrupt-names: “edma3_tcerrint”

Examples:

1.
edma: edma@49000000 {
compatible = “ti,edma3-tpcc”;
ti,hwmods = “tpcc”;
reg = <0x49000000 0x10000>;
reg-names = “edma3_cc”;
interrupts = <12 13 14>;
interrupt-names = “edma3_ccint”, “edma3_mperr”, “edma3_ccerrint”;
dma-requests = <64>;
#dma-cells = <2>;

ti,tptcs = <&edma_tptc0 7>, <&edma_tptc1 7>, <&edma_tptc2 0>;

/* Channel 20 and 21 is allocated for memcpy */
ti,edma-memcpy-channels = <20 21>;
/* The following PaRAM slots are reserved: 35-44 and 100-109 */
ti,edma-reserved-slot-ranges = <35 10>, <100 10>;

};

edma_tptc0: tptc@49800000 {
compatible = “ti,edma3-tptc”;
ti,hwmods = “tptc0”;
reg = <0x49800000 0x100000>;
interrupts = <112>;
interrupt-names = “edm3_tcerrint”;
};

edma_tptc1: tptc@49900000 {
compatible = “ti,edma3-tptc”;
ti,hwmods = “tptc1”;
reg = <0x49900000 0x100000>;
interrupts = <113>;
interrupt-names = “edm3_tcerrint”;
};

edma_tptc2: tptc@49a00000 {
compatible = “ti,edma3-tptc”;
ti,hwmods = “tptc2”;
reg = <0x49a00000 0x100000>;
interrupts = <114>;
interrupt-names = “edm3_tcerrint”;
};

sham: sham@53100000 {
compatible = “ti,omap4-sham”;
ti,hwmods = “sham”;
reg = <0x53100000 0x200>;
interrupts = <109>;
/* DMA channel 36 executed on eDMA TC0 - low priority queue */
dmas = <&edma 36 0>;
dma-names = “rx”;
};

mcasp0: mcasp@48038000 {
compatible = “ti,am33xx-mcasp-audio”;
ti,hwmods = “mcasp0”;
reg = <0x48038000 0x2000>,
<0x46000000 0x400000>;
reg-names = “mpu”, “dat”;
interrupts = <80>, <81>;
interrupt-names = “tx”, “rx”;
/* DMA channels 8 and 9 executed on eDMA TC2 - high priority queue */
dmas = <&edma 8 2>,
<&edma 9 2>;
dma-names = “tx”, “rx”;
};

2.
edma1: edma@2728000 {
compatible = “ti,k2g-edma3-tpcc”, “ti,edma3-tpcc”;
reg = <0x02728000 0x8000>;
reg-names = “edma3_cc”;
interrupts = <GIC_SPI 208 IRQ_TYPE_EDGE_RISING>,
<GIC_SPI 219 IRQ_TYPE_EDGE_RISING>,
<GIC_SPI 220 IRQ_TYPE_EDGE_RISING>;
interrupt-names = “edma3_ccint”, “emda3_mperr”,
“edma3_ccerrint”;
dma-requests = <64>;
#dma-cells = <2>;

ti,tptcs = <&edma1_tptc0 7>, <&edma1_tptc1 0>;

/*
 * memcpy is disabled, can be enabled with:
 * ti,edma-memcpy-channels = <12 13 14 15>;
 * for example.
 */

power-domains = <&k2g_pds 0x4f>;

};

edma1_tptc0: tptc@27b0000 {
compatible = “ti,k2g-edma3-tptc”, “ti,edma3-tptc”;
reg = <0x027b0000 0x400>;
power-domains = <&k2g_pds 0x4f>;
};

edma1_tptc1: tptc@27b8000 {
compatible = “ti, k2g-edma3-tptc”, “ti,edma3-tptc”;
reg = <0x027b8000 0x400>;
power-domains = <&k2g_pds 0x4f>;
};

mmc0: mmc@23000000 {
compatible = “ti,k2g-hsmmc”, “ti,omap4-hsmmc”;
reg = <0x23000000 0x400>;
interrupts = <GIC_SPI 96 IRQ_TYPE_EDGE_RISING>;
dmas = <&edma1 24 0>, <&edma1 25 0>;
dma-names = “tx”, “rx”;
bus-width = <4>;
ti,needs-special-reset;
no-1-8-v;
max-frequency = <96000000>;
power-domains = <&k2g_pds 0xb>;
clocks = <&k2g_clks 0xb 1>, <&k2g_clks 0xb 2>;
clock-names = “fck”, “mmchsdb_fck”;
};

DEPRECATED binding, new DTS files must use the ti,edma3-tpcc/ti,edma3-tptc
binding.

Required properties:

  • compatible : “ti,edma3”
  • #dma-cells: Should be set to <1>
            Clients should use a single channel number per DMA request.
  • reg: Memory map for accessing module
  • interrupt-parent: Interrupt controller the interrupt is routed through
  • interrupts: Exactly 3 interrupts need to be specified in the order:
            1. Transfer completion interrupt.
        2. Memory protection interrupt.
        3. Error interrupt.
    Optional properties:
  • ti,hwmods: Name of the hwmods associated to the EDMA
  • ti,edma-xbar-event-map: Crossbar event to channel map

Deprecated properties:
Listed here in case one wants to boot an old kernel with new DTB. These
properties might need to be added to the new DTS files.

  • ti,edma-regions: Number of regions
  • ti,edma-slots: Number of slots
  • dma-channels: Specify total DMA channels per CC

Example:

edma: edma@49000000 {
reg = <0x49000000 0x10000>;
interrupt-parent = <&intc>;
interrupts = <12 13 14>;
compatible = “ti,edma3”;
ti,hwmods = “tpcc”, “tptc0”, “tptc1”, “tptc2”;
#dma-cells = <1>;
ti,edma-xbar-event-map = /bits/ 16 <1 12
2 13>;
};

oosTech by Sam Lee