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Diffstat (limited to 'Documentation/devicetree/bindings/mips/cavium/bootbus.txt')
| -rw-r--r-- | Documentation/devicetree/bindings/mips/cavium/bootbus.txt | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mips/cavium/bootbus.txt b/Documentation/devicetree/bindings/mips/cavium/bootbus.txt new file mode 100644 index 000000000000..6581478225a2 --- /dev/null +++ b/Documentation/devicetree/bindings/mips/cavium/bootbus.txt | |||
| @@ -0,0 +1,126 @@ | |||
| 1 | * Boot Bus | ||
| 2 | |||
| 3 | The Octeon Boot Bus is a configurable parallel bus with 8 chip | ||
| 4 | selects. Each chip select is independently configurable. | ||
| 5 | |||
| 6 | Properties: | ||
| 7 | - compatible: "cavium,octeon-3860-bootbus" | ||
| 8 | |||
| 9 | Compatibility with all cn3XXX, cn5XXX and cn6XXX SOCs. | ||
| 10 | |||
| 11 | - reg: The base address of the Boot Bus' register bank. | ||
| 12 | |||
| 13 | - #address-cells: Must be <2>. The first cell is the chip select | ||
| 14 | within the bootbus. The second cell is the offset from the chip select. | ||
| 15 | |||
| 16 | - #size-cells: Must be <1>. | ||
| 17 | |||
| 18 | - ranges: There must be one one triplet of (child-bus-address, | ||
| 19 | parent-bus-address, length) for each active chip select. If the | ||
| 20 | length element for any triplet is zero, the chip select is disabled, | ||
| 21 | making it inactive. | ||
| 22 | |||
| 23 | The configuration parameters for each chip select are stored in child | ||
| 24 | nodes. | ||
| 25 | |||
| 26 | Configuration Properties: | ||
| 27 | - compatible: "cavium,octeon-3860-bootbus-config" | ||
| 28 | |||
| 29 | - cavium,cs-index: A single cell indicating the chip select that | ||
| 30 | corresponds to this configuration. | ||
| 31 | |||
| 32 | - cavium,t-adr: A cell specifying the ADR timing (in nS). | ||
| 33 | |||
| 34 | - cavium,t-ce: A cell specifying the CE timing (in nS). | ||
| 35 | |||
| 36 | - cavium,t-oe: A cell specifying the OE timing (in nS). | ||
| 37 | |||
| 38 | - cavium,t-we: A cell specifying the WE timing (in nS). | ||
| 39 | |||
| 40 | - cavium,t-rd-hld: A cell specifying the RD_HLD timing (in nS). | ||
| 41 | |||
| 42 | - cavium,t-wr-hld: A cell specifying the WR_HLD timing (in nS). | ||
| 43 | |||
| 44 | - cavium,t-pause: A cell specifying the PAUSE timing (in nS). | ||
| 45 | |||
| 46 | - cavium,t-wait: A cell specifying the WAIT timing (in nS). | ||
| 47 | |||
| 48 | - cavium,t-page: A cell specifying the PAGE timing (in nS). | ||
| 49 | |||
| 50 | - cavium,t-rd-dly: A cell specifying the RD_DLY timing (in nS). | ||
| 51 | |||
| 52 | - cavium,pages: A cell specifying the PAGES parameter (0 = 8 bytes, 1 | ||
| 53 | = 2 bytes, 2 = 4 bytes, 3 = 8 bytes). | ||
| 54 | |||
| 55 | - cavium,wait-mode: Optional. If present, wait mode (WAITM) is selected. | ||
| 56 | |||
| 57 | - cavium,page-mode: Optional. If present, page mode (PAGEM) is selected. | ||
| 58 | |||
| 59 | - cavium,bus-width: A cell specifying the WIDTH parameter (in bits) of | ||
| 60 | the bus for this chip select. | ||
| 61 | |||
| 62 | - cavium,ale-mode: Optional. If present, ALE mode is selected. | ||
| 63 | |||
| 64 | - cavium,sam-mode: Optional. If present, SAM mode is selected. | ||
| 65 | |||
| 66 | - cavium,or-mode: Optional. If present, OR mode is selected. | ||
| 67 | |||
| 68 | Example: | ||
| 69 | bootbus: bootbus@1180000000000 { | ||
| 70 | compatible = "cavium,octeon-3860-bootbus"; | ||
| 71 | reg = <0x11800 0x00000000 0x0 0x200>; | ||
| 72 | /* The chip select number and offset */ | ||
| 73 | #address-cells = <2>; | ||
| 74 | /* The size of the chip select region */ | ||
| 75 | #size-cells = <1>; | ||
| 76 | ranges = <0 0 0x0 0x1f400000 0xc00000>, | ||
| 77 | <1 0 0x10000 0x30000000 0>, | ||
| 78 | <2 0 0x10000 0x40000000 0>, | ||
| 79 | <3 0 0x10000 0x50000000 0>, | ||
| 80 | <4 0 0x0 0x1d020000 0x10000>, | ||
| 81 | <5 0 0x0 0x1d040000 0x10000>, | ||
| 82 | <6 0 0x0 0x1d050000 0x10000>, | ||
| 83 | <7 0 0x10000 0x90000000 0>; | ||
| 84 | |||
| 85 | cavium,cs-config@0 { | ||
| 86 | compatible = "cavium,octeon-3860-bootbus-config"; | ||
| 87 | cavium,cs-index = <0>; | ||
| 88 | cavium,t-adr = <20>; | ||
| 89 | cavium,t-ce = <60>; | ||
| 90 | cavium,t-oe = <60>; | ||
| 91 | cavium,t-we = <45>; | ||
| 92 | cavium,t-rd-hld = <35>; | ||
| 93 | cavium,t-wr-hld = <45>; | ||
| 94 | cavium,t-pause = <0>; | ||
| 95 | cavium,t-wait = <0>; | ||
| 96 | cavium,t-page = <35>; | ||
| 97 | cavium,t-rd-dly = <0>; | ||
| 98 | |||
| 99 | cavium,pages = <0>; | ||
| 100 | cavium,bus-width = <8>; | ||
| 101 | }; | ||
| 102 | . | ||
| 103 | . | ||
| 104 | . | ||
| 105 | cavium,cs-config@6 { | ||
| 106 | compatible = "cavium,octeon-3860-bootbus-config"; | ||
| 107 | cavium,cs-index = <6>; | ||
| 108 | cavium,t-adr = <5>; | ||
| 109 | cavium,t-ce = <300>; | ||
| 110 | cavium,t-oe = <270>; | ||
| 111 | cavium,t-we = <150>; | ||
| 112 | cavium,t-rd-hld = <100>; | ||
| 113 | cavium,t-wr-hld = <70>; | ||
| 114 | cavium,t-pause = <0>; | ||
| 115 | cavium,t-wait = <0>; | ||
| 116 | cavium,t-page = <320>; | ||
| 117 | cavium,t-rd-dly = <0>; | ||
| 118 | |||
| 119 | cavium,pages = <0>; | ||
| 120 | cavium,wait-mode; | ||
| 121 | cavium,bus-width = <16>; | ||
| 122 | }; | ||
| 123 | . | ||
| 124 | . | ||
| 125 | . | ||
| 126 | }; | ||
