| # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause |
| %YAML 1.2 |
| --- |
| $id: http://devicetree.org/schemas/mtd/brcm,brcmnand.yaml# |
| $schema: http://devicetree.org/meta-schemas/core.yaml# |
| |
| title: Broadcom STB NAND Controller |
| |
| maintainers: |
| - Brian Norris <computersforpeace@gmail.com> |
| - Kamal Dasu <kdasu.kdev@gmail.com> |
| |
| description: | |
| The Broadcom Set-Top Box NAND controller supports low-level access to raw NAND |
| flash chips. It has a memory-mapped register interface for both control |
| registers and for its data input/output buffer. On some SoCs, this controller |
| is paired with a custom DMA engine (inventively named "Flash DMA") which |
| supports basic PROGRAM and READ functions, among other features. |
| |
| This controller was originally designed for STB SoCs (BCM7xxx) but is now |
| available on a variety of Broadcom SoCs, including some BCM3xxx, BCM63xx, and |
| iProc/Cygnus. Its history includes several similar (but not fully register |
| compatible) versions. |
| |
| -- Additional SoC-specific NAND controller properties -- |
| |
| The NAND controller is integrated differently on the variety of SoCs on which |
| it is found. Part of this integration involves providing status and enable |
| bits with which to control the 8 exposed NAND interrupts, as well as hardware |
| for configuring the endianness of the data bus. On some SoCs, these features |
| are handled via standard, modular components (e.g., their interrupts look like |
| a normal IRQ chip), but on others, they are controlled in unique and |
| interesting ways, sometimes with registers that lump multiple NAND-related |
| functions together. The former case can be described simply by the standard |
| interrupts properties in the main controller node. But for the latter |
| exceptional cases, we define additional 'compatible' properties and associated |
| register resources within the NAND controller node above. |
| |
| properties: |
| compatible: |
| oneOf: |
| - items: |
| - enum: |
| - brcm,brcmnand-v2.1 |
| - brcm,brcmnand-v2.2 |
| - brcm,brcmnand-v4.0 |
| - brcm,brcmnand-v5.0 |
| - brcm,brcmnand-v6.0 |
| - brcm,brcmnand-v6.1 |
| - brcm,brcmnand-v6.2 |
| - brcm,brcmnand-v7.0 |
| - brcm,brcmnand-v7.1 |
| - brcm,brcmnand-v7.2 |
| - brcm,brcmnand-v7.3 |
| - const: brcm,brcmnand |
| - description: BCM63138 SoC-specific NAND controller |
| items: |
| - const: brcm,nand-bcm63138 |
| - enum: |
| - brcm,brcmnand-v7.0 |
| - brcm,brcmnand-v7.1 |
| - const: brcm,brcmnand |
| - description: iProc SoC-specific NAND controller |
| items: |
| - const: brcm,nand-iproc |
| - const: brcm,brcmnand-v6.1 |
| - const: brcm,brcmnand |
| - description: BCM63168 SoC-specific NAND controller |
| items: |
| - const: brcm,nand-bcm63168 |
| - const: brcm,nand-bcm6368 |
| - const: brcm,brcmnand-v4.0 |
| - const: brcm,brcmnand |
| |
| reg: |
| minItems: 1 |
| maxItems: 6 |
| |
| reg-names: |
| minItems: 1 |
| maxItems: 6 |
| items: |
| enum: [ nand, flash-dma, flash-edu, nand-cache, nand-int-base, iproc-idm, iproc-ext ] |
| |
| interrupts: |
| minItems: 1 |
| items: |
| - description: NAND CTLRDY interrupt |
| - description: FLASH_DMA_DONE (if flash DMA is available) or FLASH_EDU_DONE (if EDU is available) |
| |
| interrupt-names: |
| minItems: 1 |
| items: |
| - const: nand_ctlrdy |
| - enum: |
| - flash_dma_done |
| - flash_edu_done |
| |
| clocks: |
| maxItems: 1 |
| description: reference to the clock for the NAND controller |
| |
| clock-names: |
| const: nand |
| |
| brcm,nand-has-wp: |
| description: > |
| Some versions of this IP include a write-protect |
| (WP) control bit. It is always available on >= |
| v7.0. Use this property to describe the rare |
| earlier versions of this core that include WP |
| type: boolean |
| |
| patternProperties: |
| "^nand@[a-f0-9]$": |
| type: object |
| properties: |
| compatible: |
| const: brcm,nandcs |
| |
| nand-ecc-step-size: |
| enum: [ 512, 1024 ] |
| |
| brcm,nand-oob-sector-size: |
| description: | |
| integer, to denote the spare area sector size |
| expected for the ECC layout in use. This size, in |
| addition to the strength and step-size, |
| determines how the hardware BCH engine will lay |
| out the parity bytes it stores on the flash. |
| This property can be automatically determined by |
| the flash geometry (particularly the NAND page |
| and OOB size) in many cases, but when booting |
| from NAND, the boot controller has only a limited |
| number of available options for its default ECC |
| layout. |
| $ref: /schemas/types.yaml#/definitions/uint32 |
| |
| allOf: |
| - $ref: nand-controller.yaml# |
| - if: |
| properties: |
| compatible: |
| contains: |
| const: brcm,nand-bcm63138 |
| then: |
| properties: |
| reg-names: |
| items: |
| - const: nand |
| - const: nand-int-base |
| - if: |
| properties: |
| compatible: |
| contains: |
| const: brcm,nand-bcm6368 |
| then: |
| properties: |
| reg-names: |
| items: |
| - const: nand |
| - const: nand-int-base |
| - const: nand-cache |
| - if: |
| properties: |
| compatible: |
| contains: |
| const: brcm,nand-iproc |
| then: |
| properties: |
| reg-names: |
| items: |
| - const: nand |
| - const: iproc-idm |
| - const: iproc-ext |
| - if: |
| properties: |
| interrupts: |
| minItems: 2 |
| then: |
| required: |
| - interrupt-names |
| |
| unevaluatedProperties: false |
| |
| required: |
| - reg |
| - reg-names |
| - interrupts |
| |
| examples: |
| - | |
| nand-controller@f0442800 { |
| compatible = "brcm,brcmnand-v7.0", "brcm,brcmnand"; |
| reg = <0xf0442800 0x600>, |
| <0xf0443000 0x100>; |
| reg-names = "nand", "flash-dma"; |
| interrupt-parent = <&hif_intr2_intc>; |
| interrupts = <24>, <4>; |
| interrupt-names = "nand_ctlrdy", "flash_dma_done"; |
| |
| #address-cells = <1>; |
| #size-cells = <0>; |
| |
| nand@1 { |
| compatible = "brcm,nandcs"; |
| reg = <1>; // Chip select 1 |
| nand-on-flash-bbt; |
| nand-ecc-strength = <12>; |
| nand-ecc-step-size = <512>; |
| |
| #address-cells = <1>; |
| #size-cells = <1>; |
| }; |
| }; |
| - | |
| nand-controller@10000200 { |
| compatible = "brcm,nand-bcm63168", "brcm,nand-bcm6368", |
| "brcm,brcmnand-v4.0", "brcm,brcmnand"; |
| reg = <0x10000200 0x180>, |
| <0x100000b0 0x10>, |
| <0x10000600 0x200>; |
| reg-names = "nand", "nand-int-base", "nand-cache"; |
| interrupt-parent = <&periph_intc>; |
| interrupts = <50>; |
| clocks = <&periph_clk 20>; |
| clock-names = "nand"; |
| |
| #address-cells = <1>; |
| #size-cells = <0>; |
| |
| nand@0 { |
| compatible = "brcm,nandcs"; |
| reg = <0>; |
| nand-on-flash-bbt; |
| nand-ecc-strength = <1>; |
| nand-ecc-step-size = <512>; |
| |
| #address-cells = <1>; |
| #size-cells = <1>; |
| }; |
| }; |
