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Date: Tue, 22 Apr 2008 17:10:28 +0400
From: Sergei Shtylyov <sshtylyov@...mvista.com>
To: Jeff Garzik <jeff@...zik.org>, htejun@...il.com
Cc: Adrian Bunk <bunk@...nel.org>, linux-kernel@...r.kernel.org,
linux-ide@...r.kernel.org
Subject: Re: [2.6 patch] select ATA_SFF
Hello.
Adrian Bunk wrote:
> Making ATA_SFF a user-visible option with the drivers needing it
> depending on it caused the following problems:
> - people lose their driver when accidentally disabling it
> - people not requiring it needlessly enable it
> Fortunately, we don't have to bother the user with this option at all
> since we can simply select it when it's required.
> Signed-off-by: Adrian Bunk <bunk@...nel.org>
[...]
> @@ -132,6 +119,7 @@ config SATA_NV
> config PDC_ADMA
> tristate "Pacific Digital ADMA support"
> depends on PCI
> + select ATA_SFF
> help
> This option enables support for Pacific Digital ADMA controllers
ADMA is not SFF-8038i compilant, it's the IDE DMA spec of its own. And I'm
seeing references to libata-sff.c... confusing.
> @@ -248,6 +249,7 @@ config PATA_ARTOP
> config PATA_AT32
> tristate "Atmel AVR32 PATA support (Experimental)"
> depends on AVR32 && PLATFORM_AT32AP && EXPERIMENTAL
> + select ATA_SFF
> help
> This option enables support for the IDE devices on the
> Atmel AT32AP platform.
I'm seeing no DMA support here... yet there are calls to
> @@ -266,6 +269,7 @@ config PATA_ATIIXP
> config PATA_CMD640_PCI
> tristate "CMD640 PCI PATA support (Very Experimental)"
> depends on PCI && EXPERIMENTAL
> + select ATA_SFF
> help
> This option enables support for the CMD640 PCI IDE
> interface chip. Only the primary channel is currently
PIO only chip... yet its driver seems to call libata-sff.c...
> @@ -285,6 +290,7 @@ config PATA_CMD64X
> config PATA_CS5520
> tristate "CS5510/5520 PATA support"
> depends on PCI
> + select ATA_SFF
> help
> This option enables support for the Cyrix 5510/5520
> companion chip used with the MediaGX/Geode processor family.
These chips are PIO only. Yet the driver calls libata-sff.c, hm...
> @@ -375,6 +390,7 @@ config PATA_HPT3X2N
> config PATA_HPT3X3
> tristate "HPT 343/363 PATA support"
> depends on PCI
> + select ATA_SFF
> help
> This option enables support for the HPT 343/363
> PATA controllers via the new ATA layer
> @@ -384,6 +400,7 @@ config PATA_HPT3X3
> config PATA_HPT3X3_DMA
> bool "HPT 343/363 DMA support (Experimental)"
> depends on PATA_HPT3X3
> + select ATA_SFF
I don't think this 'select' is needed, since it's not on option that
enables the driver itself, just DMA support in it.
> help
> This option enables DMA support for the HPT343/363
> controllers. Enable with care as there are still some
> @@ -392,6 +409,7 @@ config PATA_HPT3X3_DMA
> config PATA_ISAPNP
> tristate "ISA Plug and Play PATA support (Experimental)"
> depends on EXPERIMENTAL && ISAPNP
> + select ATA_SFF
> help
> This option enables support for ISA plug & play ATA
> controllers such as those found on old soundcards.
PnP IDE is not SFF-8038i compliant, and not DMA capable, IIUC.
> @@ -429,6 +450,7 @@ config PATA_JMICRON
> config PATA_LEGACY
> tristate "Legacy ISA PATA support (Experimental)"
> depends on ISA && EXPERIMENTAL
> + select ATA_SFF
> help
> This option enables support for ISA/VLB bus legacy PATA
> ports and allows them to be accessed via the new ATA layer.
PIO only driver, no SFF-8038i stuff... but calls libata-sff.c, hm...
> @@ -456,6 +480,7 @@ config PATA_MARVELL
> config PATA_MPC52xx
> tristate "Freescale MPC52xx SoC internal IDE"
> depends on PPC_MPC52xx
> + select ATA_SFF
> help
> This option enables support for integrated IDE controller
> of the Freescale MPC52xx SoC.
DMA is not SFF-8038i compliant -- however it calls libata-sff.c...
> @@ -465,6 +490,7 @@ config PATA_MPC52xx
> config PATA_MPIIX
> tristate "Intel PATA MPIIX support"
> depends on PCI
> + select ATA_SFF
> help
> This option enables support for MPIIX PATA support.
PIO only, no SFF-8038i compliant registers. Yet it calls liabat-sff.c...
> @@ -490,6 +518,7 @@ config PATA_NETCELL
> config PATA_NINJA32
> tristate "Ninja32/Delkin Cardbus ATA support (Experimental)"
> depends on PCI && EXPERIMENTAL
> + select ATA_SFF
> help
> This option enables support for the Ninja32, Delkin and
> possibly other brands of Cardbus ATA adapter
BMDMA here is not SFF-8038i compatible. Uses libata-sff.c though, it seems...
> @@ -499,6 +528,7 @@ config PATA_NINJA32
> config PATA_NS87410
> tristate "Nat Semi NS87410 PATA support (Experimental)"
> depends on PCI && EXPERIMENTAL
> + select ATA_SFF
> help
> This option enables support for the National Semiconductor
> NS87410 PCI-IDE controller.
PIO only driver, no SFF-8038i compatible registers. Seems to be calling
libata-sff.c though...
> @@ -517,6 +548,7 @@ config PATA_NS87415
> config PATA_OPTI
> tristate "OPTI621/6215 PATA support (Very Experimental)"
> depends on PCI && EXPERIMENTAL
> + select ATA_SFF
> help
> This option enables full PIO support for the early Opti ATA
> controllers found on some old motherboards.
PIO only driver, not SFF-8038i compliant. Seems to be calling libata-sff.c...
> @@ -536,6 +569,7 @@ config PATA_OPTIDMA
> config PATA_PCMCIA
> tristate "PCMCIA PATA support"
> depends on PCMCIA
> + select ATA_SFF
> help
> This option enables support for PCMCIA ATA interfaces, including
> compact flash card adapters via the new ATA layer.
PCMCIA driver is PIO only, not SFF-8038i "by definition" since it's not
PCI. Yet seems to call libab-sff.c...
> @@ -554,12 +589,14 @@ config PATA_PDC_OLD
> config PATA_QDI
> tristate "QDI VLB PATA support"
> depends on ISA
> + select ATA_SFF
> help
> Support for QDI 6500 and 6580 PATA controllers on VESA local bus.
QDI6580 is VLB PIO only driver -- therefore not SFF-8038i compliant.
> @@ -578,6 +616,7 @@ config PATA_RB500
> config PATA_RZ1000
> tristate "PC Tech RZ1000 PATA support"
> depends on PCI
> + select ATA_SFF
> help
> This option enables basic support for the PC Tech RZ1000/1
> PATA controllers via the new ATA layer
RZ1000 is PIO only, IIRC -- no SFF-8038i registers.
> @@ -647,6 +693,7 @@ config PATA_WINBOND
> config PATA_WINBOND_VLB
> tristate "Winbond W83759A VLB PATA support (Experimental)"
> depends on ISA && EXPERIMENTAL
> + select ATA_SFF
> help
> Support for the Winbond W83759A controller on Vesa Local Bus
> systems.
This is VLB PIO only driver -- no SFF-8038i. Seems to call libata-sff.c
though...
> @@ -673,6 +722,7 @@ config PATA_OF_PLATFORM
> config PATA_ICSIDE
> tristate "Acorn ICS PATA support"
> depends on ARM && ARCH_ACORN
> + select ATA_SFF
> help
> On Acorn systems, say Y here if you wish to use the ICS PATA
> interface card. This is not required for ICS partition support.
ICS is not SFF-8038i compliant. However it calls libata-sff.c... go figure.
> @@ -691,6 +742,7 @@ config PATA_IXP4XX_CF
> config PATA_SCC
> tristate "Toshiba's Cell Reference Set IDE support"
> depends on PCI && PPC_CELLEB
> + select ATA_SFF
SCC PATA is not SFF-8038i compliant. Seem to calls libata-sff.c however...
> help
> This option enables support for the built-in IDE controller on
> Toshiba Cell Reference Board.
Looks like there's no clean separation within libata-sff.c itself between
SFF-8038i (BMDMA spec) and IDE registers itself -- that confused me: at first
I thought there's a big issue with a patch. :-/
Jeff, Tejun, what "sff" in the file name actually means? Isn't it strange
that the drivers lacking DMA support or not really compliant with SFF-8038i
have to link with this file?
MBR, Sergei
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