Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/powerpc/fsl/pamu.txt
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1 Freescale Peripheral Management Access Unit (PAMU) Device Tree Binding 2 3 DESCRIPTION 4 5 The PAMU is an I/O MMU that provides device-to-memory access control and 6 address translation capabilities. 7 8 Required properties: 9 10 - compatible : <string> 11 First entry is a version-specific string, such as 12 "fsl,pamu-v1.0". The second is "fsl,pamu". 13 - ranges : <prop-encoded-array> 14 A standard property. Utilized to describe the memory mapped 15 I/O space utilized by the controller. The size should 16 be set to the total size of the register space of all 17 physically present PAMU controllers. For example, for 18 PAMU v1.0, on an SOC that has five PAMU devices, the size 19 is 0x5000. 20 - interrupts : <prop-encoded-array> 21 Interrupt mappings. The first tuple is the normal PAMU 22 interrupt, used for reporting access violations. The second 23 is for PAMU hardware errors, such as PAMU operation errors 24 and ECC errors. 25 - #address-cells: <u32> 26 A standard property. 27 - #size-cells : <u32> 28 A standard property. 29 30 Optional properties: 31 - reg : <prop-encoded-array> 32 A standard property. It represents the CCSR registers of 33 all child PAMUs combined. Include it to provide support 34 for legacy drivers. 35 - fsl,portid-mapping : <u32> 36 The Coherency Subdomain ID Port Mapping Registers and 37 Snoop ID Port Mapping registers, which are part of the 38 CoreNet Coherency fabric (CCF), provide a CoreNet 39 Coherency Subdomain ID/CoreNet Snoop ID to pamu mapping 40 functions. Certain bits from these registers should be 41 set if PAMUs should be snooped. This property defines 42 a bitmask which selects the bits that should be set if 43 PAMUs should be snooped. 44 45 Child nodes: 46 47 Each child node represents one PAMU controller. Each SOC device that is 48 connected to a specific PAMU device should have a "fsl,pamu-phandle" property 49 that links to the corresponding specific child PAMU controller. 50 51 - reg : <prop-encoded-array> 52 A standard property. Specifies the physical address and 53 length (relative to the parent 'ranges' property) of this 54 PAMU controller's configuration registers. The size should 55 be set to the size of this PAMU controllers's register space. 56 For PAMU v1.0, this size is 0x1000. 57 - fsl,primary-cache-geometry 58 : <prop-encoded-array> 59 Two cells that specify the geometry of the primary PAMU 60 cache. The first is the number of cache lines, and the 61 second is the number of "ways". For direct-mapped caches, 62 specify a value of 1. 63 - fsl,secondary-cache-geometry 64 : <prop-encoded-array> 65 Two cells that specify the geometry of the secondary PAMU 66 cache. The first is the number of cache lines, and the 67 second is the number of "ways". For direct-mapped caches, 68 specify a value of 1. 69 70 Device nodes: 71 72 Devices that have LIODNs need to specify links to the parent PAMU controller 73 (the actual PAMU controller that this device is connected to) and a pointer to 74 the LIODN register, if applicable. 75 76 - fsl,iommu-parent 77 : <phandle> 78 Phandle to the single, specific PAMU controller node to which 79 this device is connect. The PAMU topology is represented in 80 the device tree to assist code that dynamically determines the 81 best LIODN values to minimize PAMU cache thrashing. 82 83 - fsl,liodn-reg : <prop-encoded-array> 84 Two cells that specify the location of the LIODN register 85 for this device. Required for devices that have a single 86 LIODN. The first cell is a phandle to a node that contains 87 the registers where the LIODN is to be set. The second is 88 the offset from the first "reg" resource of the node where 89 the specific LIODN register is located. 90 91 92 Example: 93 94 iommu@20000 { 95 compatible = "fsl,pamu-v1.0", "fsl,pamu"; 96 reg = <0x20000 0x5000>; 97 ranges = <0 0x20000 0x5000>; 98 fsl,portid-mapping = <0xf80000>; 99 #address-cells = <1>; 100 #size-cells = <1>; 101 interrupts = < 102 24 2 0 0 103 16 2 1 30>; 104 105 pamu0: pamu@0 { 106 reg = <0 0x1000>; 107 fsl,primary-cache-geometry = <32 1>; 108 fsl,secondary-cache-geometry = <128 2>; 109 }; 110 111 pamu1: pamu@1000 { 112 reg = <0x1000 0x1000>; 113 fsl,primary-cache-geometry = <32 1>; 114 fsl,secondary-cache-geometry = <128 2>; 115 }; 116 117 pamu2: pamu@2000 { 118 reg = <0x2000 0x1000>; 119 fsl,primary-cache-geometry = <32 1>; 120 fsl,secondary-cache-geometry = <128 2>; 121 }; 122 123 pamu3: pamu@3000 { 124 reg = <0x3000 0x1000>; 125 fsl,primary-cache-geometry = <32 1>; 126 fsl,secondary-cache-geometry = <128 2>; 127 }; 128 129 pamu4: pamu@4000 { 130 reg = <0x4000 0x1000>; 131 fsl,primary-cache-geometry = <32 1>; 132 fsl,secondary-cache-geometry = <128 2>; 133 }; 134 }; 135 136 guts: global-utilities@e0000 { 137 compatible = "fsl,qoriq-device-config-1.0"; 138 reg = <0xe0000 0xe00>; 139 fsl,has-rstcr; 140 #sleep-cells = <1>; 141 fsl,liodn-bits = <12>; 142 }; 143 144 /include/ "qoriq-dma-0.dtsi" 145 dma@100300 { 146 fsl,iommu-parent = <&pamu0>; 147 fsl,liodn-reg = <&guts 0x584>; /* DMA2LIODNR */ 148 };
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