Documentation/devicetree/bindings/memory-controllers/nvidia,tegra-mc.txt

   1 NVIDIA Tegra Memory Controller device tree bindings
   2 ===================================================
   3
   4 memory-controller node
   5 ----------------------
   6
   7 Required properties:
   8 - compatible: Should be "nvidia,tegra<chip>-mc"
   9 - reg: Physical base address and length of the controller's registers.
  10 - clocks: Must contain an entry for each entry in clock-names.
  11   See ../clocks/clock-bindings.txt for details.
  12 - clock-names: Must include the following entries:
  13   - mc: the module's clock input
  14 - interrupts: The interrupt outputs from the controller.
  15 - #iommu-cells: Should be 1. The single cell of the IOMMU specifier defines
  16   the SWGROUP of the master.
  17
  18 This device implements an IOMMU that complies with the generic IOMMU binding.
  19 See ../iommu/iommu.txt for details.
  20
  21 emc-timings subnode
  22 -------------------
  23
  24 The node should contain a "emc-timings" subnode for each supported RAM type (see field RAM_CODE in
  25 register PMC_STRAPPING_OPT_A).
  26
  27 Required properties for "emc-timings" nodes :
  28 - nvidia,ram-code : Should contain the value of RAM_CODE this timing set is used for.
  29
  30 timing subnode
  31 --------------
  32
  33 Each "emc-timings" node should contain a subnode for every supported EMC clock rate.
  34
  35 Required properties for timing nodes :
  36 - clock-frequency : Should contain the memory clock rate in Hz.
  37 - nvidia,emem-configuration : Values to be written to the EMEM register block. For the Tegra124 SoC
  38 (see section "15.6.1 MC Registers" in the TRM), these are the registers whose values need to be
  39 specified, according to the board documentation:
  40
  41         MC_EMEM_ARB_CFG
  42         MC_EMEM_ARB_OUTSTANDING_REQ
  43         MC_EMEM_ARB_TIMING_RCD
  44         MC_EMEM_ARB_TIMING_RP
  45         MC_EMEM_ARB_TIMING_RC
  46         MC_EMEM_ARB_TIMING_RAS
  47         MC_EMEM_ARB_TIMING_FAW
  48         MC_EMEM_ARB_TIMING_RRD
  49         MC_EMEM_ARB_TIMING_RAP2PRE
  50         MC_EMEM_ARB_TIMING_WAP2PRE
  51         MC_EMEM_ARB_TIMING_R2R
  52         MC_EMEM_ARB_TIMING_W2W
  53         MC_EMEM_ARB_TIMING_R2W
  54         MC_EMEM_ARB_TIMING_W2R
  55         MC_EMEM_ARB_DA_TURNS
  56         MC_EMEM_ARB_DA_COVERS
  57         MC_EMEM_ARB_MISC0
  58         MC_EMEM_ARB_MISC1
  59         MC_EMEM_ARB_RING1_THROTTLE
  60
  61 Example SoC include file:
  62
  63 / {
  64         mc: memory-controller@0,70019000 {
  65                 compatible = "nvidia,tegra124-mc";
  66                 reg = <0x0 0x70019000 0x0 0x1000>;
  67                 clocks = <&tegra_car TEGRA124_CLK_MC>;
  68                 clock-names = "mc";
  69
  70                 interrupts = <GIC_SPI 77 IRQ_TYPE_LEVEL_HIGH>;
  71
  72                 #iommu-cells = <1>;
  73         };
  74
  75         sdhci@0,700b0000 {
  76                 compatible = "nvidia,tegra124-sdhci";
  77                 ...
  78                 iommus = <&mc TEGRA_SWGROUP_SDMMC1A>;
  79         };
  80 };
  81
  82 Example board file:
  83
  84 / {
  85         memory-controller@0,70019000 {
  86                 emc-timings-3 {
  87                         nvidia,ram-code = <3>;
  88
  89                         timing-12750000 {
  90                                 clock-frequency = <12750000>;
  91
  92                                 nvidia,emem-configuration = <
  93                                         0x40040001 /* MC_EMEM_ARB_CFG */
  94                                         0x8000000a /* MC_EMEM_ARB_OUTSTANDING_REQ */
  95                                         0x00000001 /* MC_EMEM_ARB_TIMING_RCD */
  96                                         0x00000001 /* MC_EMEM_ARB_TIMING_RP */
  97                                         0x00000002 /* MC_EMEM_ARB_TIMING_RC */
  98                                         0x00000000 /* MC_EMEM_ARB_TIMING_RAS */
  99                                         0x00000002 /* MC_EMEM_ARB_TIMING_FAW */
 100                                         0x00000001 /* MC_EMEM_ARB_TIMING_RRD */
 101                                         0x00000002 /* MC_EMEM_ARB_TIMING_RAP2PRE */
 102                                         0x00000008 /* MC_EMEM_ARB_TIMING_WAP2PRE */
 103                                         0x00000003 /* MC_EMEM_ARB_TIMING_R2R */
 104                                         0x00000002 /* MC_EMEM_ARB_TIMING_W2W */
 105                                         0x00000003 /* MC_EMEM_ARB_TIMING_R2W */
 106                                         0x00000006 /* MC_EMEM_ARB_TIMING_W2R */
 107                                         0x06030203 /* MC_EMEM_ARB_DA_TURNS */
 108                                         0x000a0402 /* MC_EMEM_ARB_DA_COVERS */
 109                                         0x77e30303 /* MC_EMEM_ARB_MISC0 */
 110                                         0x70000f03 /* MC_EMEM_ARB_MISC1 */
 111                                         0x001f0000 /* MC_EMEM_ARB_RING1_THROTTLE */
 112                                 >;
 113                         };
 114                 };
 115         };
 116 };