afe4b25e7d
XScale cores either have a DSP coprocessor (which contains a single 40 bit accumulator register), or an iWMMXt coprocessor (which contains eight 64 bit registers.) Because of the small amount of state in the DSP coprocessor, access to the DSP coprocessor (CP0) is always enabled, and DSP context switching is done unconditionally on every task switch. Access to the iWMMXt coprocessor (CP0/CP1) is enabled only when an iWMMXt instruction is first issued, and iWMMXt context switching is done lazily. CONFIG_IWMMXT is supposed to mean 'the cpu we will be running on will have iWMMXt support', but boards are supposed to select this config symbol by hand, and at least one pxa27x board doesn't get this right, so on that board, proc-xscale.S will incorrectly assume that we have a DSP coprocessor, enable CP0 on boot, and we will then only save the first iWMMXt register (wR0) on context switches, which is Bad. This patch redefines CONFIG_IWMMXT as 'the cpu we will be running on might have iWMMXt support, and we will enable iWMMXt context switching if it does.' This means that with this patch, running a CONFIG_IWMMXT=n kernel on an iWMMXt-capable CPU will no longer potentially corrupt iWMMXt state over context switches, and running a CONFIG_IWMMXT=y kernel on a non-iWMMXt capable CPU will still do DSP context save/restore. These changes should make iWMMXt work on PXA3xx, and as a side effect, enable proper acc0 save/restore on non-iWMMXt capable xsc3 cores such as IOP13xx and IXP23xx (which will not have CONFIG_CPU_XSCALE defined), as well as setting and using HWCAP_IWMMXT properly. Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Acked-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
148 lines
2.7 KiB
Plaintext
148 lines
2.7 KiB
Plaintext
if ARCH_PXA
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menu "Intel PXA2xx Implementations"
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choice
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prompt "Select target board"
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config ARCH_LUBBOCK
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bool "Intel DBPXA250 Development Platform"
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select PXA25x
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select SA1111
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config MACH_LOGICPD_PXA270
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bool "LogicPD PXA270 Card Engine Development Platform"
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select PXA27x
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config MACH_MAINSTONE
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bool "Intel HCDDBBVA0 Development Platform"
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select PXA27x
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config ARCH_PXA_IDP
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bool "Accelent Xscale IDP"
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select PXA25x
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config PXA_SHARPSL
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bool "SHARP Zaurus SL-5600, SL-C7xx and SL-Cxx00 Models"
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select SHARP_SCOOP
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select SHARP_PARAM
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help
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Say Y here if you intend to run this kernel on a
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Sharp Zaurus SL-5600 (Poodle), SL-C700 (Corgi),
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SL-C750 (Shepherd), SL-C760 (Husky), SL-C1000 (Akita),
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SL-C3000 (Spitz), SL-C3100 (Borzoi) or SL-C6000x (Tosa)
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handheld computer.
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config MACH_TRIZEPS4
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bool "Keith und Koep Trizeps4 DIMM-Module"
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select PXA27x
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endchoice
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if PXA_SHARPSL
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choice
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prompt "Select target Sharp Zaurus device range"
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config PXA_SHARPSL_25x
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bool "Sharp PXA25x models (SL-5600, SL-C7xx and SL-C6000x)"
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select PXA25x
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config PXA_SHARPSL_27x
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bool "Sharp PXA270 models (SL-Cxx00)"
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select PXA27x
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endchoice
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endif
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if MACH_TRIZEPS4
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choice
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prompt "Select base board for Trizeps 4 module"
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config MACH_TRIZEPS4_CONXS
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bool "ConXS Eval Board"
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config MACH_TRIZEPS4_ANY
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bool "another Board"
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endchoice
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endif
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endmenu
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config MACH_POODLE
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bool "Enable Sharp SL-5600 (Poodle) Support"
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depends PXA_SHARPSL_25x
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select SHARP_LOCOMO
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select PXA_SSP
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config MACH_CORGI
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bool "Enable Sharp SL-C700 (Corgi) Support"
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depends PXA_SHARPSL_25x
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select PXA_SHARP_C7xx
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config MACH_SHEPHERD
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bool "Enable Sharp SL-C750 (Shepherd) Support"
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depends PXA_SHARPSL_25x
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select PXA_SHARP_C7xx
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config MACH_HUSKY
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bool "Enable Sharp SL-C760 (Husky) Support"
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depends PXA_SHARPSL_25x
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select PXA_SHARP_C7xx
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config MACH_AKITA
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bool "Enable Sharp SL-1000 (Akita) Support"
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depends PXA_SHARPSL_27x
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select PXA_SHARP_Cxx00
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select MACH_SPITZ
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select I2C
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select I2C_PXA
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config MACH_SPITZ
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bool "Enable Sharp Zaurus SL-3000 (Spitz) Support"
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depends PXA_SHARPSL_27x
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select PXA_SHARP_Cxx00
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config MACH_BORZOI
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bool "Enable Sharp Zaurus SL-3100 (Borzoi) Support"
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depends PXA_SHARPSL_27x
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select PXA_SHARP_Cxx00
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config MACH_TOSA
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bool "Enable Sharp SL-6000x (Tosa) Support"
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depends PXA_SHARPSL_25x
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config PXA25x
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bool
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help
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Select code specific to PXA21x/25x/26x variants
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config PXA27x
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bool
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help
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Select code specific to PXA27x variants
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config PXA_SHARP_C7xx
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bool
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select PXA_SSP
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select SHARPSL_PM
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help
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Enable support for all Sharp C7xx models
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config PXA_SHARP_Cxx00
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bool
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select PXA_SSP
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select SHARPSL_PM
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help
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Enable common support for Sharp Cxx00 models
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config PXA_SSP
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tristate
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help
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Enable support for PXA2xx SSP ports
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endif
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