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Linus Torvalds
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| Original file line number | Diff line number | Diff line change |
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| @@ -1,2 +1,2 @@ | ||
| --- | ||
| refs/heads/master: 64f68416e794d59a42ddffdf1c5b7f026a4f23d5 | ||
| refs/heads/master: 9fe9293d14e8418f29136216f0180f47270a916a |
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| Original file line number | Diff line number | Diff line change |
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| CFI or JEDEC memory-mapped NOR flash | ||
|
|
||
| Flash chips (Memory Technology Devices) are often used for solid state | ||
| file systems on embedded devices. | ||
|
|
||
| - compatible : should contain the specific model of flash chip(s) | ||
| used, if known, followed by either "cfi-flash" or "jedec-flash" | ||
| - reg : Address range(s) of the flash chip(s) | ||
| It's possible to (optionally) define multiple "reg" tuples so that | ||
| non-identical NOR chips can be described in one flash node. | ||
| - bank-width : Width (in bytes) of the flash bank. Equal to the | ||
| device width times the number of interleaved chips. | ||
| - device-width : (optional) Width of a single flash chip. If | ||
| omitted, assumed to be equal to 'bank-width'. | ||
| - #address-cells, #size-cells : Must be present if the flash has | ||
| sub-nodes representing partitions (see below). In this case | ||
| both #address-cells and #size-cells must be equal to 1. | ||
|
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| For JEDEC compatible devices, the following additional properties | ||
| are defined: | ||
|
|
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| - vendor-id : Contains the flash chip's vendor id (1 byte). | ||
| - device-id : Contains the flash chip's device id (1 byte). | ||
|
|
||
| In addition to the information on the flash bank itself, the | ||
| device tree may optionally contain additional information | ||
| describing partitions of the flash address space. This can be | ||
| used on platforms which have strong conventions about which | ||
| portions of the flash are used for what purposes, but which don't | ||
| use an on-flash partition table such as RedBoot. | ||
|
|
||
| Each partition is represented as a sub-node of the flash device. | ||
| Each node's name represents the name of the corresponding | ||
| partition of the flash device. | ||
|
|
||
| Flash partitions | ||
| - reg : The partition's offset and size within the flash bank. | ||
| - label : (optional) The label / name for this flash partition. | ||
| If omitted, the label is taken from the node name (excluding | ||
| the unit address). | ||
| - read-only : (optional) This parameter, if present, is a hint to | ||
| Linux that this flash partition should only be mounted | ||
| read-only. This is usually used for flash partitions | ||
| containing early-boot firmware images or data which should not | ||
| be clobbered. | ||
|
|
||
| Example: | ||
|
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| flash@ff000000 { | ||
| compatible = "amd,am29lv128ml", "cfi-flash"; | ||
| reg = <ff000000 01000000>; | ||
| bank-width = <4>; | ||
| device-width = <1>; | ||
| #address-cells = <1>; | ||
| #size-cells = <1>; | ||
| fs@0 { | ||
| label = "fs"; | ||
| reg = <0 f80000>; | ||
| }; | ||
| firmware@f80000 { | ||
| label ="firmware"; | ||
| reg = <f80000 80000>; | ||
| read-only; | ||
| }; | ||
| }; | ||
|
|
||
| Here an example with multiple "reg" tuples: | ||
|
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| flash@f0000000,0 { | ||
| #address-cells = <1>; | ||
| #size-cells = <1>; | ||
| compatible = "intel,PC48F4400P0VB", "cfi-flash"; | ||
| reg = <0 0x00000000 0x02000000 | ||
| 0 0x02000000 0x02000000>; | ||
| bank-width = <2>; | ||
| partition@0 { | ||
| label = "test-part1"; | ||
| reg = <0 0x04000000>; | ||
| }; | ||
| }; |
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| /* | ||
| * arch/arm/mach-kirkwood/include/mach/bridge-regs.h | ||
| * | ||
| * Mbus-L to Mbus Bridge Registers | ||
| * | ||
| * This file is licensed under the terms of the GNU General Public | ||
| * License version 2. This program is licensed "as is" without any | ||
| * warranty of any kind, whether express or implied. | ||
| */ | ||
|
|
||
| #ifndef __ASM_ARCH_BRIDGE_REGS_H | ||
| #define __ASM_ARCH_BRIDGE_REGS_H | ||
|
|
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| #include <mach/kirkwood.h> | ||
|
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||
| #define CPU_CONTROL (BRIDGE_VIRT_BASE | 0x0104) | ||
| #define CPU_RESET 0x00000002 | ||
|
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| #define RSTOUTn_MASK (BRIDGE_VIRT_BASE | 0x0108) | ||
| #define SOFT_RESET_OUT_EN 0x00000004 | ||
|
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| #define SYSTEM_SOFT_RESET (BRIDGE_VIRT_BASE | 0x010c) | ||
| #define SOFT_RESET 0x00000001 | ||
|
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||
| #define BRIDGE_CAUSE (BRIDGE_VIRT_BASE | 0x0110) | ||
| #define BRIDGE_MASK (BRIDGE_VIRT_BASE | 0x0114) | ||
| #define BRIDGE_INT_TIMER0 0x0002 | ||
| #define BRIDGE_INT_TIMER1 0x0004 | ||
| #define BRIDGE_INT_TIMER1_CLR (~0x0004) | ||
|
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||
| #define IRQ_VIRT_BASE (BRIDGE_VIRT_BASE | 0x0200) | ||
| #define IRQ_CAUSE_LOW_OFF 0x0000 | ||
| #define IRQ_MASK_LOW_OFF 0x0004 | ||
| #define IRQ_CAUSE_HIGH_OFF 0x0010 | ||
| #define IRQ_MASK_HIGH_OFF 0x0014 | ||
|
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||
| #define TIMER_VIRT_BASE (BRIDGE_VIRT_BASE | 0x0300) | ||
|
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| #define L2_CONFIG_REG (BRIDGE_VIRT_BASE | 0x0128) | ||
| #define L2_WRITETHROUGH 0x00000010 | ||
|
|
||
| #endif |
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