15155ed100
Change-Id: I7e293532983f350a6f7cd9c7bc2bc6633c8fd3f2 Reviewed-on: http://gerrit.rockbox.org/671 Reviewed-by: Amaury Pouly <amaury.pouly@gmail.com>
135 lines
5 KiB
Text
135 lines
5 KiB
Text
This file describes the format of the register map based on XML.
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Root
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----
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As any XML document, the content of the file should be enclosed in a "xml" tag.
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Example:
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<?xml version="1.0"?>
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<!-- desc -->
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</xml>
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Element: soc
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------------
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The XML can contain one or more SoC description. Each description is enclosed in
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a "soc" tag. The following properties are defined:
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- "name" (mandatory,string): the mnemonic of the SoC.
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- "desc" (optional,string): a textual description of the SoC.
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Example:
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<soc name="stmp3700" desc="STMP3700">
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<!-- soc desc -->
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</soc>
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Element: soc.dev
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----------------
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Each SoC can contain any number of devices. Each device is enclosed in a "dev"
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tag. A device is logical group of registers and doesn't have a precise meaning.
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If a SoC has several copies of the same device at different addresses (SSP1, SSP2
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for example), then only one copy has to be described since a device can have
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several address (see soc.dev.addr section). The following properties are defined:
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- "name" (mandatory,string): the mnemonic of the device.
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- "long_name" (optional,string): a short description of the device.
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- "desc" (optional,string): a long description of the SoC.
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- "version" (optional,string): version of the register description for this device.
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Example:
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<dev name="APBH" long_name="APHB DMA" desc="AHB-to-APBH Bridge with DMA" version="3.2.0">
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<!-- dev desc>
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</dev>
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Element: soc.dev.addr
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---------------------
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Each device can have one or more addresses associated with it. Each address is
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enclosed in a "addr" tag. This allows to describe several blocks are once on SoCs
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where several copies of the same block exist at different addresses.
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The following properties are defined:
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- "name" (mandatory,string): unique name of this instance of the device.
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- "addr" (mandatory,integer): base address of this instance of the device.
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Example:
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<addr name="SSP1" addr="0x80010000" />
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<addr name="SSP2" addr="0x80034000" />
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Element: soc.dev.reg
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--------------------
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Each device can contain any number of registers. Each register is enclosed in a
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"reg" tag. If a SoC has several copies of the same register at different addresses
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(INTERRUPT0, INTERRUPT1 for example), then only one copy has to be described since
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a register can have several address (see soc.dev.reg.addr section).
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The following properties are defined:
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- "name" (mandatory,string): the mnemonic of the register.
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- "sct" (optional,"yes" or "no"): STMP specific attribute to specify the existence
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of the SCT variants of this register.
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As a shortcut, in the case the register has a single address, one can add one more
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property:
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- "addr" (optional,integer): base address of this instance of the register.
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Example:
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<reg name="TIMCTRLn" sct="yes">
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<!-- reg desc -->
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</reg>
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The address shortcut has the following standard translation:
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<reg name="GPIO_PADR" addr="0x00">
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<!-- bla -->
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</reg>
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is equivalent to:
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<reg name="GPIO_PADR">
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<addr name="GPIO_PADR" addr="0x00">
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<!-- bla -->
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</reg>
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Element: soc.dev.reg.addr
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-------------------------
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Each device can have one or more addresses associated with it. Each address
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is enclosed in a "addr" tag. This allows to describe several register at once on
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SoCs where a similar register is replicated several times.
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The following properties are defined:
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- "name" (mandatory,string): unique name of this instance of the register.
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- "addr" (mandatory,integer): base address of this instance of the register.
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Example:
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<addr name="TIMCTRL0" addr="0x20" />
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<addr name="TIMCTRL1" addr="0x40" />
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<addr name="TIMCTRL2" addr="0x60" />
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Element: soc.dev.reg.formula
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----------------------------
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In the special case where the addresses of the register follow a pattern, an
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explicit formula can be described as part of the format. There is no specific
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requirement on the formula except that the register addresses be indexed by
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a variable "n" which range from 0 to N-1 where N is the number of address.
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The formula is not used for anything except header generation where it is
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handy to have a formula rather a long list of conditionals.
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The following properties are defined:
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- "string" (mandatory,string): the equation describing the addresses.
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Example:
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<formula string="0x20+n*0x20"/>
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Element: soc.dev.reg.field
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--------------------------
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Each register can be further divided into disjoints fields. Each field
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is enclosed in a "field" tag. A field is defined as a contiguous set
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of bits in the register. The following properties are defined:
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- "name" (mandatory,string): the mnemonic of field
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- "bitrange" (mandatory,string): the bit range of the field written as
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"n-m" where n and m are integers giving the most (resp. least) significant
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bit of the field.
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Example:
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<field name="PRESCALE" bitrange="5:4">
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<!-- field desc -->
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</field>
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Element: soc.dev.reg.field.value
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--------------------------------
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Each field can describe a list of named values in cases where this is appropriate.
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Each value is enclosed in a "value" tag. The following properties are defined:
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- "name" (mandatory,string): the mnemonic of the value.
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- "value" (mandatory,integer): the associated value.
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Example:
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<value name="DIV_BY_1" value="0x0" />
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<value name="DIV_BY_2" value="0x1" />
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