RFC: Compact Flash True IDE Mode Driver

RFC: Compact Flash True IDE Mode Driver

[Kumar Gala]

I was hoping to get some comments on this work in progress driver for
using a compact flash device running in True IDE Mode connect via a MMIO
interface.  The driver is working, however the embedded system I'm running
on need some HW fixes to address the fact that the byte lanes for the data
are swapped.  I figured now was a good time to incorporate any changes
while I wait for the HW fixes (which will allow me to remove the 
cfide_outsw & cfide_insw).

- kumar


diff --git a/drivers/ide/Kconfig b/drivers/ide/Kconfig
index 1c81174..8334baf 100644
--- a/drivers/ide/Kconfig
+++ b/drivers/ide/Kconfig
@@ -930,6 +930,12 @@ config BLK_DEV_Q40IDE
 	  normally be on; disable it only if you are running a custom hard
 	  drive subsystem through an expansion card.
 
+config BLK_DEV_CFIDE
+	tristate "Compact Flash in True IDE mode"
+	help
+	  This is the IDE driver for a Memory Mapped Compact Flash Device
+	  running in True IDE mode.
+
 config BLK_DEV_MPC8xx_IDE
 	bool "MPC8xx IDE support"
 	depends on 8xx && IDE=y && BLK_DEV_IDE=y
diff --git a/drivers/ide/Makefile b/drivers/ide/Makefile
index 569fae7..09ed3aa 100644
--- a/drivers/ide/Makefile
+++ b/drivers/ide/Makefile
@@ -32,6 +32,7 @@ ide-core-$(CONFIG_BLK_DEV_FALCON_IDE)	+=
 ide-core-$(CONFIG_BLK_DEV_GAYLE)	+= legacy/gayle.o
 ide-core-$(CONFIG_BLK_DEV_MAC_IDE)	+= legacy/macide.o
 ide-core-$(CONFIG_BLK_DEV_Q40IDE)	+= legacy/q40ide.o
+ide-core-$(CONFIG_BLK_DEV_CFIDE)	+= legacy/cfide.o
 
 # built-in only drivers from ppc/
 ide-core-$(CONFIG_BLK_DEV_MPC8xx_IDE)	+= ppc/mpc8xx.o
diff --git a/drivers/ide/legacy/cfide.c b/drivers/ide/legacy/cfide.c
new file mode 100644
index 0000000..4444005
--- /dev/null
+++ b/drivers/ide/legacy/cfide.c
@@ -0,0 +1,222 @@
+/*
+ * Compact Flash Memory Mapped True IDE mode driver
+ *
+ * Maintainer: Kumar Gala <galak@kernel.crashing.org>
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/ide.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <asm/io.h>
+#include <asm/byteorder.h>
+
+static void __iomem *cfide_mapbase;
+static void __iomem *cfide_alt_mapbase;
+
+/* xxx: use standard outsw, insw when byte lanes swapped */
+static void cfide_outsw(unsigned long port, void *addr, u32 count)
+{
+	_outsw((volatile u16 __iomem *)port, addr, count);
+}
+
+static void cfide_insw(unsigned long port, void *addr, u32 count)
+{
+	_insw((volatile u16 __iomem *)port, addr, count);
+}
+
+static void cfide_outl(u32 addr, unsigned long port)
+{
+	panic("outl unsupported");
+}
+
+static void cfide_outsl(unsigned long port, void *addr, u32 count)
+{
+	panic("outsl unsupported");
+}
+
+static u32 cfide_inl(unsigned long port)
+{
+	panic("inl unsupported");
+	return 0;
+}
+
+static void cfide_insl(unsigned long port, void *addr, u32 count)
+{
+	panic("insl unsupported");
+}
+
+static ide_hwif_t *cfide_locate_hwif(void __iomem * base, void __iomem * ctrl,
+				     unsigned int sz, int irq)
+{
+	unsigned long port = (unsigned long)base;
+	ide_hwif_t *hwif;
+	int index, i;
+
+	for (index = 0; index < MAX_HWIFS; ++index) {
+		hwif = ide_hwifs + index;
+		if (hwif->io_ports[IDE_DATA_OFFSET] == port)
+			goto found;
+	}
+
+	for (index = 0; index < MAX_HWIFS; ++index) {
+		hwif = ide_hwifs + index;
+		if (hwif->io_ports[IDE_DATA_OFFSET] == 0)
+			goto found;
+	}
+
+	return NULL;
+
+ found:
+
+	/* xxx: fix when byte lanes are swapped */
+	hwif->hw.io_ports[IDE_DATA_OFFSET] = port;
+	port += 3;
+	for (i = IDE_ERROR_OFFSET; i <= IDE_STATUS_OFFSET; i++, port += sz)
+		hwif->hw.io_ports[i] = port;
+
+	hwif->hw.io_ports[IDE_CONTROL_OFFSET] = (unsigned long)ctrl + 13;
+
+	memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->hw.io_ports));
+	hwif->hw.irq = hwif->irq = irq;
+
+	hwif->hw.dma = NO_DMA;
+	hwif->hw.chipset = ide_unknown;
+
+	hwif->mmio = 2;
+	default_hwif_mmiops(hwif);
+	hwif->OUTL = cfide_outl;
+	hwif->OUTSW = cfide_outsw;
+	hwif->OUTSL = cfide_outsl;
+	hwif->INL = cfide_inl;
+	hwif->INSW = cfide_insw;
+	hwif->INSL = cfide_insl;
+
+	return hwif;
+}
+
+static int __devinit cfide_lbus_probe(struct platform_device *dev)
+{
+	struct resource *res_base, *res_alt, *res_irq;
+	ide_hwif_t *hwif;
+	int ret = 0;
+
+	/* get a pointer to the register memory */
+	res_base = platform_get_resource(dev, IORESOURCE_MEM, 0);
+	res_alt = platform_get_resource(dev, IORESOURCE_MEM, 1);
+	res_irq = platform_get_resource(dev, IORESOURCE_IRQ, 0);
+
+	if ((!res_base) || (!res_alt) || (!res_irq)) {
+		ret = -ENODEV;
+		goto out;
+	}
+
+	if (!request_mem_region
+	    (res_base->start, res_base->end - res_base->start + 1, dev->name)) {
+		pr_debug("%s: request_mem_region of base failed\n", dev->name);
+		ret = -EBUSY;
+		goto out;
+	}
+
+	if (!request_mem_region
+	    (res_alt->start, res_alt->end - res_alt->start + 1, dev->name)) {
+		pr_debug("%s: request_mem_region of alt failed\n", dev->name);
+		ret = -EBUSY;
+		goto out;
+	}
+
+	cfide_mapbase =
+	    ioremap(res_base->start, res_base->end - res_base->start + 1);
+	if (!cfide_mapbase) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	cfide_alt_mapbase =
+	    ioremap(res_alt->start, res_alt->end - res_alt->start + 1);
+
+	if (!cfide_alt_mapbase) {
+		ret = -ENOMEM;
+		goto unmap_base;
+	}
+
+	hwif = cfide_locate_hwif(cfide_mapbase, cfide_alt_mapbase, 2,
+			      res_irq->start);
+
+	if (!hwif) {
+		ret = -ENODEV;
+		goto unmap_alt;
+	}
+
+	hwif->gendev.parent = &dev->dev;
+	hwif->noprobe = 0;
+
+	probe_hwif_init(hwif);
+
+	platform_set_drvdata(dev, hwif);
+
+	return 0;
+
+ unmap_alt:
+	iounmap(cfide_alt_mapbase);
+ unmap_base:
+	iounmap(cfide_mapbase);
+ out:
+	return ret;
+}
+
+static int __devexit cfide_lbus_remove(struct platform_device *dev)
+{
+	ide_hwif_t *hwif = platform_get_drvdata(dev);
+	struct resource *res_base, *res_alt;
+
+	/* get a pointer to the register memory */
+	res_base = platform_get_resource(dev, IORESOURCE_MEM, 0);
+	res_alt = platform_get_resource(dev, IORESOURCE_MEM, 1);
+
+	release_mem_region(res_base->start, res_base->end - res_base->start + 1);
+	release_mem_region(res_alt->start, res_alt->end - res_alt->start + 1);
+
+	platform_set_drvdata(dev, NULL);
+
+	/* there must be a better way */
+	ide_unregister(hwif - ide_hwifs);
+
+	iounmap(cfide_mapbase);
+	iounmap(cfide_alt_mapbase);
+
+	return 0;
+}
+
+static struct platform_driver cfide_driver = {
+	.probe = cfide_lbus_probe,
+	.remove = __devexit_p(cfide_lbus_remove),
+	.driver = {
+		   .name = "mmio-cfide",
+		   },
+};
+
+static int __init cfide_lbus_init(void)
+{
+	return platform_driver_register(&cfide_driver);
+}
+
+static void __exit cfide_lbus_exit(void)
+{
+	platform_driver_unregister(&cfide_driver);
+}
+
+MODULE_DESCRIPTION("MMIO based True IDE Mode Compact Flash Driver");
+MODULE_LICENSE("GPL");
+
+module_init(cfide_lbus_init);
+module_exit(cfide_lbus_exit);

Re: RFC: Compact Flash True IDE Mode Driver

[Benjamin Herrenschmidt]

On Wed, 2006-02-01 at 01:19 -0600, Kumar Gala wrote:
> I was hoping to get some comments on this work in progress driver for
> using a compact flash device running in True IDE Mode connect via a MMIO
> interface.  The driver is working, however the embedded system I'm running
> on need some HW fixes to address the fact that the byte lanes for the data
> are swapped.  I figured now was a good time to incorporate any changes
> while I wait for the HW fixes (which will allow me to remove the 
> cfide_outsw & cfide_insw).

Your driver basically boils down to a simple IDE host driver configured
by platform functions. I suggest you remove "compact flash" here and
have the platform resource optinally be either PIO or MMIO and you
magically get a "generic" IDE driver useable by a lot of simple embedded
machines (it assumes all timing related things have been handled by the
firmware). Want to be sneakier ? Add a timing setup callback to the
platform data you pass to it and you get one that can even do PIO
modes :)

Ben.

Re: RFC: Compact Flash True IDE Mode Driver

[Bartlomiej Zolnierkiewicz]

Hi,

On 2/1/06, Kumar Gala <galak@kernel.crashing.org> wrote:
> I was hoping to get some comments on this work in progress driver for
> using a compact flash device running in True IDE Mode connect via a MMIO
> interface.  The driver is working, however the embedded system I'm running
> on need some HW fixes to address the fact that the byte lanes for the data
> are swapped.  I figured now was a good time to incorporate any changes
> while I wait for the HW fixes (which will allow me to remove the
> cfide_outsw & cfide_insw).
>
> - kumar
>
>
> diff --git a/drivers/ide/Kconfig b/drivers/ide/Kconfig
> index 1c81174..8334baf 100644
> --- a/drivers/ide/Kconfig
> +++ b/drivers/ide/Kconfig
> @@ -930,6 +930,12 @@ config BLK_DEV_Q40IDE
>           normally be on; disable it only if you are running a custom hard
>           drive subsystem through an expansion card.
>
> +config BLK_DEV_CFIDE
> +       tristate "Compact Flash in True IDE mode"

depends on?

> +       help
> +         This is the IDE driver for a Memory Mapped Compact Flash Device
> +         running in True IDE mode.
> +
>  config BLK_DEV_MPC8xx_IDE
>         bool "MPC8xx IDE support"
>         depends on 8xx && IDE=y && BLK_DEV_IDE=y
> diff --git a/drivers/ide/Makefile b/drivers/ide/Makefile
> index 569fae7..09ed3aa 100644
> --- a/drivers/ide/Makefile
> +++ b/drivers/ide/Makefile
> @@ -32,6 +32,7 @@ ide-core-$(CONFIG_BLK_DEV_FALCON_IDE) +=
>  ide-core-$(CONFIG_BLK_DEV_GAYLE)       += legacy/gayle.o
>  ide-core-$(CONFIG_BLK_DEV_MAC_IDE)     += legacy/macide.o
>  ide-core-$(CONFIG_BLK_DEV_Q40IDE)      += legacy/q40ide.o
> +ide-core-$(CONFIG_BLK_DEV_CFIDE)       += legacy/cfide.o

Won't fly.  As comment in Makefile states "ide-core" is for
built-in only drivers.  Please see how ide-cs is handled.

>  # built-in only drivers from ppc/
>  ide-core-$(CONFIG_BLK_DEV_MPC8xx_IDE)  += ppc/mpc8xx.o
> diff --git a/drivers/ide/legacy/cfide.c b/drivers/ide/legacy/cfide.c
> new file mode 100644
> index 0000000..4444005
> --- /dev/null
> +++ b/drivers/ide/legacy/cfide.c
> @@ -0,0 +1,222 @@
> +/*
> + * Compact Flash Memory Mapped True IDE mode driver
> + *
> + * Maintainer: Kumar Gala <galak@kernel.crashing.org>
> + *
> + * This program is free software; you can redistribute  it and/or modify it
> + * under  the terms of  the GNU General  Public License as published by the
> + * Free Software Foundation;  either version 2 of the  License, or (at your
> + * option) any later version.
> + */
> +
> +#include <linux/config.h>

Is this needed?

> +#include <linux/types.h>
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/ide.h>
> +#include <linux/ioport.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <asm/io.h>
> +#include <asm/byteorder.h>

ditto

> +static void __iomem *cfide_mapbase;
> +static void __iomem *cfide_alt_mapbase;
> +
> +/* xxx: use standard outsw, insw when byte lanes swapped */
> +static void cfide_outsw(unsigned long port, void *addr, u32 count)
> +{
> +       _outsw((volatile u16 __iomem *)port, addr, count);
> +}
> +
> +static void cfide_insw(unsigned long port, void *addr, u32 count)
> +{
> +       _insw((volatile u16 __iomem *)port, addr, count);
> +}
> +
> +static void cfide_outl(u32 addr, unsigned long port)
> +{
> +       panic("outl unsupported");
> +}

Can be removed as it is not used in any code-path for this controller.

> +static void cfide_outsl(unsigned long port, void *addr, u32 count)
> +{
> +       panic("outsl unsupported");
> +}

This will panic as soon as somebody tries to enable 32-bit I/O
using hdparm.  Please add ide_hwif_t.no_io_32bit flag and teach
ide-disk.c:ide_disk_setup() about it (separate patch).

> +static u32 cfide_inl(unsigned long port)
> +{
> +       panic("inl unsupported");
> +       return 0;
> +}

same problem as with cfide_outl()

> +static void cfide_insl(unsigned long port, void *addr, u32 count)
> +{
> +       panic("insl unsupported");
> +}

same problem as with cfide_outsl()

> +static ide_hwif_t *cfide_locate_hwif(void __iomem * base, void __iomem * ctrl,
> +                                    unsigned int sz, int irq)

__devinit

> +{
> +       unsigned long port = (unsigned long)base;
> +       ide_hwif_t *hwif;
> +       int index, i;
> +
> +       for (index = 0; index < MAX_HWIFS; ++index) {
> +               hwif = ide_hwifs + index;
> +               if (hwif->io_ports[IDE_DATA_OFFSET] == port)
> +                       goto found;
> +       }
> +
> +       for (index = 0; index < MAX_HWIFS; ++index) {
> +               hwif = ide_hwifs + index;
> +               if (hwif->io_ports[IDE_DATA_OFFSET] == 0)
> +                       goto found;
> +       }
> +
> +       return NULL;

This is the same as in icside.c/rapide.c,
it really should be generic helper (separate patch)

> + found:
> +
> +       /* xxx: fix when byte lanes are swapped */
> +       hwif->hw.io_ports[IDE_DATA_OFFSET] = port;
> +       port += 3;
> +       for (i = IDE_ERROR_OFFSET; i <= IDE_STATUS_OFFSET; i++, port += sz)
> +               hwif->hw.io_ports[i] = port;
> +
> +       hwif->hw.io_ports[IDE_CONTROL_OFFSET] = (unsigned long)ctrl + 13;
> +
> +       memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->hw.io_ports));
> +       hwif->hw.irq = hwif->irq = irq;
> +
> +       hwif->hw.dma = NO_DMA;
> +       hwif->hw.chipset = ide_unknown;

Please use ide_generic or add new type,
ide_unknown indicates that this slot is free.

> +       hwif->mmio = 2;
> +       default_hwif_mmiops(hwif);
> +       hwif->OUTL = cfide_outl;

= NULL;

> +       hwif->OUTSW = cfide_outsw;
> +       hwif->OUTSL = cfide_outsl;

ditto

> +       hwif->INL = cfide_inl;

ditto

> +       hwif->INSW = cfide_insw;
> +       hwif->INSL = cfide_insl;

ditto

> +       return hwif;
> +}
> +
> +static int __devinit cfide_lbus_probe(struct platform_device *dev)
> +{
> +       struct resource *res_base, *res_alt, *res_irq;
> +       ide_hwif_t *hwif;
> +       int ret = 0;
> +
> +       /* get a pointer to the register memory */
> +       res_base = platform_get_resource(dev, IORESOURCE_MEM, 0);
> +       res_alt = platform_get_resource(dev, IORESOURCE_MEM, 1);
> +       res_irq = platform_get_resource(dev, IORESOURCE_IRQ, 0);
> +
> +       if ((!res_base) || (!res_alt) || (!res_irq)) {
> +               ret = -ENODEV;
> +               goto out;
> +       }
> +
> +       if (!request_mem_region
> +           (res_base->start, res_base->end - res_base->start + 1, dev->name)) {
> +               pr_debug("%s: request_mem_region of base failed\n", dev->name);
> +               ret = -EBUSY;
> +               goto out;
> +       }
> +
> +       if (!request_mem_region
> +           (res_alt->start, res_alt->end - res_alt->start + 1, dev->name)) {
> +               pr_debug("%s: request_mem_region of alt failed\n", dev->name);
> +               ret = -EBUSY;
> +               goto out;

res_base needs to be freed

> +       }
> +
> +       cfide_mapbase =
> +           ioremap(res_base->start, res_base->end - res_base->start + 1);
> +       if (!cfide_mapbase) {
> +               ret = -ENOMEM;
> +               goto out;

res_base and res_alt need to be freed

> +       }
> +
> +       cfide_alt_mapbase =
> +           ioremap(res_alt->start, res_alt->end - res_alt->start + 1);
> +
> +       if (!cfide_alt_mapbase) {
> +               ret = -ENOMEM;
> +               goto unmap_base;
> +       }
> +
> +       hwif = cfide_locate_hwif(cfide_mapbase, cfide_alt_mapbase, 2,
> +                             res_irq->start);
> +
> +       if (!hwif) {
> +               ret = -ENODEV;
> +               goto unmap_alt;
> +       }
> +
> +       hwif->gendev.parent = &dev->dev;
> +       hwif->noprobe = 0;
> +
> +       probe_hwif_init(hwif);

create_proc_ide_interfaces() is missing

> +       platform_set_drvdata(dev, hwif);
> +
> +       return 0;
> +
> + unmap_alt:
> +       iounmap(cfide_alt_mapbase);
> + unmap_base:
> +       iounmap(cfide_mapbase);
> + out:
> +       return ret;
> +}
> +
> +static int __devexit cfide_lbus_remove(struct platform_device *dev)
> +{
> +       ide_hwif_t *hwif = platform_get_drvdata(dev);
> +       struct resource *res_base, *res_alt;
> +
> +       /* get a pointer to the register memory */
> +       res_base = platform_get_resource(dev, IORESOURCE_MEM, 0);
> +       res_alt = platform_get_resource(dev, IORESOURCE_MEM, 1);
> +
> +       release_mem_region(res_base->start, res_base->end - res_base->start + 1);
> +       release_mem_region(res_alt->start, res_alt->end - res_alt->start + 1);
> +
> +       platform_set_drvdata(dev, NULL);
> +
> +       /* there must be a better way */

yes, fixing IDE unplug :)

> +       ide_unregister(hwif - ide_hwifs);

Otherwise driver looks pretty decent and with the above changes
it gets my ACK.  Additional enhancements as suggested by Ben
would be nice but obviously they are not needed for a start

Thanks,
Bartlomiej

Re: RFC: Compact Flash True IDE Mode Driver

[Kumar Gala]

On Mon, 13 Feb 2006, Bartlomiej Zolnierkiewicz wrote:

> Hi,
> 
> On 2/1/06, Kumar Gala <galak@kernel.crashing.org> wrote:
> > I was hoping to get some comments on this work in progress driver for
> > using a compact flash device running in True IDE Mode connect via a MMIO
> > interface.  The driver is working, however the embedded system I'm running
> > on need some HW fixes to address the fact that the byte lanes for the data
> > are swapped.  I figured now was a good time to incorporate any changes
> > while I wait for the HW fixes (which will allow me to remove the
> > cfide_outsw & cfide_insw).
> >
> > - kumar
> >
> >
> > diff --git a/drivers/ide/Kconfig b/drivers/ide/Kconfig
> > index 1c81174..8334baf 100644
> > --- a/drivers/ide/Kconfig
> > +++ b/drivers/ide/Kconfig
> > @@ -930,6 +930,12 @@ config BLK_DEV_Q40IDE
> >           normally be on; disable it only if you are running a custom hard
> >           drive subsystem through an expansion card.
> >
> > +config BLK_DEV_CFIDE
> > +       tristate "Compact Flash in True IDE mode"
> 
> depends on?

It really doesn't depend on anything.

> 
> > +       help
> > +         This is the IDE driver for a Memory Mapped Compact Flash Device
> > +         running in True IDE mode.
> > +
> >  config BLK_DEV_MPC8xx_IDE
> >         bool "MPC8xx IDE support"
> >         depends on 8xx && IDE=y && BLK_DEV_IDE=y
> > diff --git a/drivers/ide/Makefile b/drivers/ide/Makefile
> > index 569fae7..09ed3aa 100644
> > --- a/drivers/ide/Makefile
> > +++ b/drivers/ide/Makefile
> > @@ -32,6 +32,7 @@ ide-core-$(CONFIG_BLK_DEV_FALCON_IDE) +=
> >  ide-core-$(CONFIG_BLK_DEV_GAYLE)       += legacy/gayle.o
> >  ide-core-$(CONFIG_BLK_DEV_MAC_IDE)     += legacy/macide.o
> >  ide-core-$(CONFIG_BLK_DEV_Q40IDE)      += legacy/q40ide.o
> > +ide-core-$(CONFIG_BLK_DEV_CFIDE)       += legacy/cfide.o
> 
> Won't fly.  As comment in Makefile states "ide-core" is for
> built-in only drivers.  Please see how ide-cs is handled.

Gotcha, will move to ide/legacy/Makefile

> 
> >  # built-in only drivers from ppc/
> >  ide-core-$(CONFIG_BLK_DEV_MPC8xx_IDE)  += ppc/mpc8xx.o
> > diff --git a/drivers/ide/legacy/cfide.c b/drivers/ide/legacy/cfide.c
> > new file mode 100644
> > index 0000000..4444005
> > --- /dev/null
> > +++ b/drivers/ide/legacy/cfide.c
> > @@ -0,0 +1,222 @@
> > +/*
> > + * Compact Flash Memory Mapped True IDE mode driver
> > + *
> > + * Maintainer: Kumar Gala <galak@kernel.crashing.org>
> > + *
> > + * This program is free software; you can redistribute  it and/or modify it
> > + * under  the terms of  the GNU General  Public License as published by the
> > + * Free Software Foundation;  either version 2 of the  License, or (at your
> > + * option) any later version.
> > + */
> > +
> > +#include <linux/config.h>
> 
> Is this needed?
> 
> > +#include <linux/types.h>
> > +#include <linux/init.h>
> > +#include <linux/kernel.h>
> > +#include <linux/ide.h>
> > +#include <linux/ioport.h>
> > +#include <linux/module.h>
> > +#include <linux/platform_device.h>
> > +#include <asm/io.h>
> > +#include <asm/byteorder.h>
> 
> ditto
> 
> > +static void __iomem *cfide_mapbase;
> > +static void __iomem *cfide_alt_mapbase;
> > +
> > +/* xxx: use standard outsw, insw when byte lanes swapped */
> > +static void cfide_outsw(unsigned long port, void *addr, u32 count)
> > +{
> > +       _outsw((volatile u16 __iomem *)port, addr, count);
> > +}
> > +
> > +static void cfide_insw(unsigned long port, void *addr, u32 count)
> > +{
> > +       _insw((volatile u16 __iomem *)port, addr, count);
> > +}
> > +
> > +static void cfide_outl(u32 addr, unsigned long port)
> > +{
> > +       panic("outl unsupported");
> > +}
> 
> Can be removed as it is not used in any code-path for this controller.
> 
> > +static void cfide_outsl(unsigned long port, void *addr, u32 count)
> > +{
> > +       panic("outsl unsupported");
> > +}
> 
> This will panic as soon as somebody tries to enable 32-bit I/O
> using hdparm.  Please add ide_hwif_t.no_io_32bit flag and teach
> ide-disk.c:ide_disk_setup() about it (separate patch).

I'm not sure I follow this, can you expand.

> 
> > +static u32 cfide_inl(unsigned long port)
> > +{
> > +       panic("inl unsupported");
> > +       return 0;
> > +}
> 
> same problem as with cfide_outl()
> 
> > +static void cfide_insl(unsigned long port, void *addr, u32 count)
> > +{
> > +       panic("insl unsupported");
> > +}
> 
> same problem as with cfide_outsl()
> 
> > +static ide_hwif_t *cfide_locate_hwif(void __iomem * base, void __iomem * ctrl,
> > +                                    unsigned int sz, int irq)
> 
> __devinit
> 
> > +{
> > +       unsigned long port = (unsigned long)base;
> > +       ide_hwif_t *hwif;
> > +       int index, i;
> > +
> > +       for (index = 0; index < MAX_HWIFS; ++index) {
> > +               hwif = ide_hwifs + index;
> > +               if (hwif->io_ports[IDE_DATA_OFFSET] == port)
> > +                       goto found;
> > +       }
> > +
> > +       for (index = 0; index < MAX_HWIFS; ++index) {
> > +               hwif = ide_hwifs + index;
> > +               if (hwif->io_ports[IDE_DATA_OFFSET] == 0)
> > +                       goto found;
> > +       }
> > +
> > +       return NULL;
> 
> This is the same as in icside.c/rapide.c,
> it really should be generic helper (separate patch)

Suggesitions, on where that should live, ide-probe.c?

> 
> > + found:
> > +
> > +       /* xxx: fix when byte lanes are swapped */
> > +       hwif->hw.io_ports[IDE_DATA_OFFSET] = port;
> > +       port += 3;
> > +       for (i = IDE_ERROR_OFFSET; i <= IDE_STATUS_OFFSET; i++, port += sz)
> > +               hwif->hw.io_ports[i] = port;
> > +
> > +       hwif->hw.io_ports[IDE_CONTROL_OFFSET] = (unsigned long)ctrl + 13;
> > +
> > +       memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->hw.io_ports));
> > +       hwif->hw.irq = hwif->irq = irq;
> > +
> > +       hwif->hw.dma = NO_DMA;
> > +       hwif->hw.chipset = ide_unknown;
> 
> Please use ide_generic or add new type,
> ide_unknown indicates that this slot is free.
> 
> > +       hwif->mmio = 2;
> > +       default_hwif_mmiops(hwif);
> > +       hwif->OUTL = cfide_outl;
> 
> = NULL;
> 
> > +       hwif->OUTSW = cfide_outsw;
> > +       hwif->OUTSL = cfide_outsl;
> 
> ditto
> 
> > +       hwif->INL = cfide_inl;
> 
> ditto
> 
> > +       hwif->INSW = cfide_insw;
> > +       hwif->INSL = cfide_insl;
> 
> ditto
> 
> > +       return hwif;
> > +}
> > +
> > +static int __devinit cfide_lbus_probe(struct platform_device *dev)
> > +{
> > +       struct resource *res_base, *res_alt, *res_irq;
> > +       ide_hwif_t *hwif;
> > +       int ret = 0;
> > +
> > +       /* get a pointer to the register memory */
> > +       res_base = platform_get_resource(dev, IORESOURCE_MEM, 0);
> > +       res_alt = platform_get_resource(dev, IORESOURCE_MEM, 1);
> > +       res_irq = platform_get_resource(dev, IORESOURCE_IRQ, 0);
> > +
> > +       if ((!res_base) || (!res_alt) || (!res_irq)) {
> > +               ret = -ENODEV;
> > +               goto out;
> > +       }
> > +
> > +       if (!request_mem_region
> > +           (res_base->start, res_base->end - res_base->start + 1, dev->name)) {
> > +               pr_debug("%s: request_mem_region of base failed\n", dev->name);
> > +               ret = -EBUSY;
> > +               goto out;
> > +       }
> > +
> > +       if (!request_mem_region
> > +           (res_alt->start, res_alt->end - res_alt->start + 1, dev->name)) {
> > +               pr_debug("%s: request_mem_region of alt failed\n", dev->name);
> > +               ret = -EBUSY;
> > +               goto out;
> 
> res_base needs to be freed
> 
> > +       }
> > +
> > +       cfide_mapbase =
> > +           ioremap(res_base->start, res_base->end - res_base->start + 1);
> > +       if (!cfide_mapbase) {
> > +               ret = -ENOMEM;
> > +               goto out;
> 
> res_base and res_alt need to be freed
> 
> > +       }
> > +
> > +       cfide_alt_mapbase =
> > +           ioremap(res_alt->start, res_alt->end - res_alt->start + 1);
> > +
> > +       if (!cfide_alt_mapbase) {
> > +               ret = -ENOMEM;
> > +               goto unmap_base;
> > +       }
> > +
> > +       hwif = cfide_locate_hwif(cfide_mapbase, cfide_alt_mapbase, 2,
> > +                             res_irq->start);
> > +
> > +       if (!hwif) {
> > +               ret = -ENODEV;
> > +               goto unmap_alt;
> > +       }
> > +
> > +       hwif->gendev.parent = &dev->dev;
> > +       hwif->noprobe = 0;
> > +
> > +       probe_hwif_init(hwif);
> 
> create_proc_ide_interfaces() is missing
> 
> > +       platform_set_drvdata(dev, hwif);
> > +
> > +       return 0;
> > +
> > + unmap_alt:
> > +       iounmap(cfide_alt_mapbase);
> > + unmap_base:
> > +       iounmap(cfide_mapbase);
> > + out:
> > +       return ret;
> > +}
> > +
> > +static int __devexit cfide_lbus_remove(struct platform_device *dev)
> > +{
> > +       ide_hwif_t *hwif = platform_get_drvdata(dev);
> > +       struct resource *res_base, *res_alt;
> > +
> > +       /* get a pointer to the register memory */
> > +       res_base = platform_get_resource(dev, IORESOURCE_MEM, 0);
> > +       res_alt = platform_get_resource(dev, IORESOURCE_MEM, 1);
> > +
> > +       release_mem_region(res_base->start, res_base->end - res_base->start + 1);
> > +       release_mem_region(res_alt->start, res_alt->end - res_alt->start + 1);
> > +
> > +       platform_set_drvdata(dev, NULL);
> > +
> > +       /* there must be a better way */
> 
> yes, fixing IDE unplug :)
> 
> > +       ide_unregister(hwif - ide_hwifs);
> 
> Otherwise driver looks pretty decent and with the above changes
> it gets my ACK.  Additional enhancements as suggested by Ben
> would be nice but obviously they are not needed for a start

Everything else makes sense and I'll make those changes, plus some based
on Ben's comments.  If you can let me know about the two questions
(expanding on ide_hwif_t.no_io_32bit and where to but a generic version of
cfide_locate_hwif).

thanks

- kumar

Re: RFC: Compact Flash True IDE Mode Driver

[Bartlomiej Zolnierkiewicz]

On 2/13/06, Kumar Gala <galak@kernel.crashing.org> wrote:

> > > +static void cfide_outsl(unsigned long port, void *addr, u32 count)
> > > +{
> > > +       panic("outsl unsupported");
> > > +}
> >
> > This will panic as soon as somebody tries to enable 32-bit I/O
> > using hdparm.  Please add ide_hwif_t.no_io_32bit flag and teach
> > ide-disk.c:ide_disk_setup() about it (separate patch).
>
> I'm not sure I follow this, can you expand.

Do "hdparm -c 2 /dev/hdx" first and then read/write to the device
and you should see it. :)

We need to make "hdparm -c 2" (and "hdparm -c 3") unsupported
(see how "io_32bit" setting is handled in ide_add_generic_settings()
and how it can be read-only or read-write setting depending on the
value of drive->no_io_32bit).

To do this we need to set drive->no_io_32bit to 1 (see how
ide_disk_setup() handles it).  Unfortunately 32-bit I/O capability
is based on capabilities of both host and device so we have to
add new flag hwif->no_io_32bit to indicate that host doesn't
support 32-bit I/O.

> > > +static ide_hwif_t *cfide_locate_hwif(void __iomem * base, void __iomem * ctrl,
> > > +                                    unsigned int sz, int irq)
> >
> > __devinit
> >
> > > +{
> > > +       unsigned long port = (unsigned long)base;
> > > +       ide_hwif_t *hwif;
> > > +       int index, i;
> > > +
> > > +       for (index = 0; index < MAX_HWIFS; ++index) {
> > > +               hwif = ide_hwifs + index;
> > > +               if (hwif->io_ports[IDE_DATA_OFFSET] == port)
> > > +                       goto found;
> > > +       }
> > > +
> > > +       for (index = 0; index < MAX_HWIFS; ++index) {
> > > +               hwif = ide_hwifs + index;
> > > +               if (hwif->io_ports[IDE_DATA_OFFSET] == 0)
> > > +                       goto found;
> > > +       }
> > > +
> > > +       return NULL;
> >
> > This is the same as in icside.c/rapide.c,
> > it really should be generic helper (separate patch)
>
> Suggesitions, on where that should live, ide-probe.c?

ide.c, no rush for this one as I have patch ready
(only needs to find it... sigh...)

> > Otherwise driver looks pretty decent and with the above changes
> > it gets my ACK.  Additional enhancements as suggested by Ben
> > would be nice but obviously they are not needed for a start
>
> Everything else makes sense and I'll make those changes, plus some based
> on Ben's comments.  If you can let me know about the two questions
> (expanding on ide_hwif_t.no_io_32bit and where to but a generic version of
> cfide_locate_hwif).

Thanks,
Bartlomiej

Re: RFC: Compact Flash True IDE Mode Driver

[Kumar Gala]

On Feb 13, 2006, at 10:53 AM, Bartlomiej Zolnierkiewicz wrote:

> On 2/13/06, Kumar Gala <galak@kernel.crashing.org> wrote:
>
>>>> +static void cfide_outsl(unsigned long port, void *addr, u32 count)
>>>> +{
>>>> +       panic("outsl unsupported");
>>>> +}
>>>
>>> This will panic as soon as somebody tries to enable 32-bit I/O
>>> using hdparm.  Please add ide_hwif_t.no_io_32bit flag and teach
>>> ide-disk.c:ide_disk_setup() about it (separate patch).
>>
>> I'm not sure I follow this, can you expand.
>
> Do "hdparm -c 2 /dev/hdx" first and then read/write to the device
> and you should see it. :)
>
> We need to make "hdparm -c 2" (and "hdparm -c 3") unsupported
> (see how "io_32bit" setting is handled in ide_add_generic_settings()
> and how it can be read-only or read-write setting depending on the
> value of drive->no_io_32bit).
>
> To do this we need to set drive->no_io_32bit to 1 (see how
> ide_disk_setup() handles it).  Unfortunately 32-bit I/O capability
> is based on capabilities of both host and device so we have to
> add new flag hwif->no_io_32bit to indicate that host doesn't
> support 32-bit I/O.

This all make sense, should I check for hwif->no_io_32bit in  
idedisk_setup() and set drive->no_io_32bit to 1 if hwif->no_io_32bit  
is 1 or do this the test in ide_add_generic_settings()?

- kumar

Re: RFC: Compact Flash True IDE Mode Driver

[Bartlomiej Zolnierkiewicz]

On 2/13/06, Kumar Gala <galak@kernel.crashing.org> wrote:
>
> On Feb 13, 2006, at 10:53 AM, Bartlomiej Zolnierkiewicz wrote:
>
> > On 2/13/06, Kumar Gala <galak@kernel.crashing.org> wrote:
> >
> >>>> +static void cfide_outsl(unsigned long port, void *addr, u32 count)
> >>>> +{
> >>>> +       panic("outsl unsupported");
> >>>> +}
> >>>
> >>> This will panic as soon as somebody tries to enable 32-bit I/O
> >>> using hdparm.  Please add ide_hwif_t.no_io_32bit flag and teach
> >>> ide-disk.c:ide_disk_setup() about it (separate patch).
> >>
> >> I'm not sure I follow this, can you expand.
> >
> > Do "hdparm -c 2 /dev/hdx" first and then read/write to the device
> > and you should see it. :)
> >
> > We need to make "hdparm -c 2" (and "hdparm -c 3") unsupported
> > (see how "io_32bit" setting is handled in ide_add_generic_settings()
> > and how it can be read-only or read-write setting depending on the
> > value of drive->no_io_32bit).
> >
> > To do this we need to set drive->no_io_32bit to 1 (see how
> > ide_disk_setup() handles it).  Unfortunately 32-bit I/O capability
> > is based on capabilities of both host and device so we have to
> > add new flag hwif->no_io_32bit to indicate that host doesn't
> > support 32-bit I/O.
>
> This all make sense, should I check for hwif->no_io_32bit in
> idedisk_setup() and set drive->no_io_32bit to 1 if hwif->no_io_32bit
> is 1 or do this the test in ide_add_generic_settings()?

Good question.  idedisk_setup() seems more logical but in the current
model "io_32bit" setting is still accessible without ide-disk driver through
/proc/ide/ interface so...

Moreover the current drive->no_io_32bit code in ide-disk is wrong:
* it shouldn't be overriding drive->no_io_32bit flag if it is 1
* doing this in ide-disk may be too late w.r.t. ide_add_generic_settings()

Therefore your previous suggestion is the right one - the best place
to deal with ->no_io_32bit is ide-probe.c - doing this for all drives at
the end of probe_hwif() should fix all above issues.

Thanks,
Bartlomiej

Re: RFC: Compact Flash True IDE Mode Driver

[Kumar Gala]

On Feb 13, 2006, at 2:21 PM, Bartlomiej Zolnierkiewicz wrote:

> On 2/13/06, Kumar Gala <galak@kernel.crashing.org> wrote:
>>
>> On Feb 13, 2006, at 10:53 AM, Bartlomiej Zolnierkiewicz wrote:
>>
>>> On 2/13/06, Kumar Gala <galak@kernel.crashing.org> wrote:
>>>
>>>>>> +static void cfide_outsl(unsigned long port, void *addr, u32  
>>>>>> count)
>>>>>> +{
>>>>>> +       panic("outsl unsupported");
>>>>>> +}
>>>>>
>>>>> This will panic as soon as somebody tries to enable 32-bit I/O
>>>>> using hdparm.  Please add ide_hwif_t.no_io_32bit flag and teach
>>>>> ide-disk.c:ide_disk_setup() about it (separate patch).
>>>>
>>>> I'm not sure I follow this, can you expand.
>>>
>>> Do "hdparm -c 2 /dev/hdx" first and then read/write to the device
>>> and you should see it. :)
>>>
>>> We need to make "hdparm -c 2" (and "hdparm -c 3") unsupported
>>> (see how "io_32bit" setting is handled in ide_add_generic_settings()
>>> and how it can be read-only or read-write setting depending on the
>>> value of drive->no_io_32bit).
>>>
>>> To do this we need to set drive->no_io_32bit to 1 (see how
>>> ide_disk_setup() handles it).  Unfortunately 32-bit I/O capability
>>> is based on capabilities of both host and device so we have to
>>> add new flag hwif->no_io_32bit to indicate that host doesn't
>>> support 32-bit I/O.
>>
>> This all make sense, should I check for hwif->no_io_32bit in
>> idedisk_setup() and set drive->no_io_32bit to 1 if hwif->no_io_32bit
>> is 1 or do this the test in ide_add_generic_settings()?
>
> Good question.  idedisk_setup() seems more logical but in the current
> model "io_32bit" setting is still accessible without ide-disk  
> driver through
> /proc/ide/ interface so...
>
> Moreover the current drive->no_io_32bit code in ide-disk is wrong:
> * it shouldn't be overriding drive->no_io_32bit flag if it is 1
> * doing this in ide-disk may be too late w.r.t.  
> ide_add_generic_settings()
>
> Therefore your previous suggestion is the right one - the best place
> to deal with ->no_io_32bit is ide-probe.c - doing this for all  
> drives at
> the end of probe_hwif() should fix all above issues.

Now I'm confused.  If I understand the code, what I want is for the  
"io_32bit" setting to have its RW field set to SETTING_READ, such  
that drive->no_io_32bit can NOT be changed.  Additionally, I want it  
set to 1 if hwif->no_io_32bit is 1.

Are you saying that at the end of probe_hwif() I should iterate over  
the drives for that hwif and set drive->no_io_32bit to 1 if hwif- 
 >no_io_32bit is 1?  If so, can I do this in the last loop that  
already exists that iterates over the drives?

Will I not also want to test hwif->no_io_32bit in idedisk_setup() to  
ensure that it can only set driver->no_io_32bit to 0 if hwif- 
 >no_io32bit is 0?

- kumar

Re: RFC: Compact Flash True IDE Mode Driver

[Bartlomiej Zolnierkiewicz]

On 2/13/06, Kumar Gala <galak@kernel.crashing.org> wrote:
>
> On Feb 13, 2006, at 2:21 PM, Bartlomiej Zolnierkiewicz wrote:
>
> > On 2/13/06, Kumar Gala <galak@kernel.crashing.org> wrote:
> >>
> >> On Feb 13, 2006, at 10:53 AM, Bartlomiej Zolnierkiewicz wrote:
> >>
> >>> On 2/13/06, Kumar Gala <galak@kernel.crashing.org> wrote:
> >>>
> >>>>>> +static void cfide_outsl(unsigned long port, void *addr, u32
> >>>>>> count)
> >>>>>> +{
> >>>>>> +       panic("outsl unsupported");
> >>>>>> +}
> >>>>>
> >>>>> This will panic as soon as somebody tries to enable 32-bit I/O
> >>>>> using hdparm.  Please add ide_hwif_t.no_io_32bit flag and teach
> >>>>> ide-disk.c:ide_disk_setup() about it (separate patch).
> >>>>
> >>>> I'm not sure I follow this, can you expand.
> >>>
> >>> Do "hdparm -c 2 /dev/hdx" first and then read/write to the device
> >>> and you should see it. :)
> >>>
> >>> We need to make "hdparm -c 2" (and "hdparm -c 3") unsupported
> >>> (see how "io_32bit" setting is handled in ide_add_generic_settings()
> >>> and how it can be read-only or read-write setting depending on the
> >>> value of drive->no_io_32bit).
> >>>
> >>> To do this we need to set drive->no_io_32bit to 1 (see how
> >>> ide_disk_setup() handles it).  Unfortunately 32-bit I/O capability
> >>> is based on capabilities of both host and device so we have to
> >>> add new flag hwif->no_io_32bit to indicate that host doesn't
> >>> support 32-bit I/O.
> >>
> >> This all make sense, should I check for hwif->no_io_32bit in
> >> idedisk_setup() and set drive->no_io_32bit to 1 if hwif->no_io_32bit
> >> is 1 or do this the test in ide_add_generic_settings()?
> >
> > Good question.  idedisk_setup() seems more logical but in the current
> > model "io_32bit" setting is still accessible without ide-disk
> > driver through
> > /proc/ide/ interface so...
> >
> > Moreover the current drive->no_io_32bit code in ide-disk is wrong:
> > * it shouldn't be overriding drive->no_io_32bit flag if it is 1
> > * doing this in ide-disk may be too late w.r.t.
> > ide_add_generic_settings()
> >
> > Therefore your previous suggestion is the right one - the best place
> > to deal with ->no_io_32bit is ide-probe.c - doing this for all
> > drives at
> > the end of probe_hwif() should fix all above issues.
>
> Now I'm confused.  If I understand the code, what I want is for the
> "io_32bit" setting to have its RW field set to SETTING_READ, such
> that drive->no_io_32bit can NOT be changed.  Additionally, I want it
> set to 1 if hwif->no_io_32bit is 1.

Yes.

> Are you saying that at the end of probe_hwif() I should iterate over
> the drives for that hwif and set drive->no_io_32bit to 1 if hwif-
>  >no_io_32bit is 1?  If so, can I do this in the last loop that
> already exists that iterates over the drives?

Well, no - this loop is for tuning and is already over-complicated.

> Will I not also want to test hwif->no_io_32bit in idedisk_setup() to
> ensure that it can only set driver->no_io_32bit to 0 if hwif-
>  >no_io32bit is 0?

No, you want to move this code to ide-probe.c because of the
reason given in my last mail: setting drive->no_io_32bit in ide-disk
is too late w.r.t. ide_add_generic_settings():

init_gendisk()->hwif_init()->ide_add_generic_settings()

so drive->no_io_32bit flag needs to be set earlier
(probe_hwif() is OK).

And yes, this IDE stuff is complicated... :)

Bartlomiej

Re: RFC: Compact Flash True IDE Mode Driver

[Kumar Gala]

>> Now I'm confused.  If I understand the code, what I want is for the
>> "io_32bit" setting to have its RW field set to SETTING_READ, such
>> that drive->no_io_32bit can NOT be changed.  Additionally, I want it
>> set to 1 if hwif->no_io_32bit is 1.
>
> Yes.
>
>> Are you saying that at the end of probe_hwif() I should iterate over
>> the drives for that hwif and set drive->no_io_32bit to 1 if hwif-
>>> no_io_32bit is 1?  If so, can I do this in the last loop that
>> already exists that iterates over the drives?
>
> Well, no - this loop is for tuning and is already over-complicated.
>
>> Will I not also want to test hwif->no_io_32bit in idedisk_setup() to
>> ensure that it can only set driver->no_io_32bit to 0 if hwif-
>>> no_io32bit is 0?
>
> No, you want to move this code to ide-probe.c because of the
> reason given in my last mail: setting drive->no_io_32bit in ide-disk
> is too late w.r.t. ide_add_generic_settings():
>
> init_gendisk()->hwif_init()->ide_add_generic_settings()
>
> so drive->no_io_32bit flag needs to be set earlier
> (probe_hwif() is OK).

Will drive->id->dword_io be valid by the end of probe_hwif()?

> And yes, this IDE stuff is complicated... :)

That it is ;)

- kumar

Re: RFC: Compact Flash True IDE Mode Driver

[Bartlomiej Zolnierkiewicz]

On 2/14/06, Kumar Gala <galak@kernel.crashing.org> wrote:
> >> Now I'm confused.  If I understand the code, what I want is for the
> >> "io_32bit" setting to have its RW field set to SETTING_READ, such
> >> that drive->no_io_32bit can NOT be changed.  Additionally, I want it
> >> set to 1 if hwif->no_io_32bit is 1.
> >
> > Yes.
> >
> >> Are you saying that at the end of probe_hwif() I should iterate over
> >> the drives for that hwif and set drive->no_io_32bit to 1 if hwif-
> >>> no_io_32bit is 1?  If so, can I do this in the last loop that
> >> already exists that iterates over the drives?
> >
> > Well, no - this loop is for tuning and is already over-complicated.
> >
> >> Will I not also want to test hwif->no_io_32bit in idedisk_setup() to
> >> ensure that it can only set driver->no_io_32bit to 0 if hwif-
> >>> no_io32bit is 0?
> >
> > No, you want to move this code to ide-probe.c because of the
> > reason given in my last mail: setting drive->no_io_32bit in ide-disk
> > is too late w.r.t. ide_add_generic_settings():
> >
> > init_gendisk()->hwif_init()->ide_add_generic_settings()
> >
> > so drive->no_io_32bit flag needs to be set earlier
> > (probe_hwif() is OK).
>
> Will drive->id->dword_io be valid by the end of probe_hwif()?

Yes.

> > And yes, this IDE stuff is complicated... :)
>
> That it is ;)
>
> - kumar

Re: RFC: Compact Flash True IDE Mode Driver

[Kumar Gala]

If this looks good, I'll send a more official patch with an signed-off-by.

- k

diff --git a/drivers/ide/ide-disk.c b/drivers/ide/ide-disk.c
index 09086b8..359f659 100644
--- a/drivers/ide/ide-disk.c
+++ b/drivers/ide/ide-disk.c
@@ -977,8 +977,6 @@ static void idedisk_setup (ide_drive_t *
 		ide_dma_verbose(drive);
 	printk("\n");
 
-	drive->no_io_32bit = id->dword_io ? 1 : 0;
-
 	/* write cache enabled? */
 	if ((id->csfo & 1) || (id->cfs_enable_1 & (1 << 5)))
 		drive->wcache = 1;
diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index 427d1c2..1b7b4c5 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -858,6 +858,15 @@ static void probe_hwif(ide_hwif_t *hwif)
 			}
 		}
 	}
+
+	for (unit = 0; unit < MAX_DRIVES; ++unit) {
+		ide_drive_t *drive = &hwif->drives[unit];
+
+		if (hwif->no_io_32bit)
+			drive->no_io_32bit = 1;
+		else
+			drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
+	}
 }
 
 static int hwif_init(ide_hwif_t *hwif);
diff --git a/include/linux/ide.h b/include/linux/ide.h
index a7fc4cc..8d2db41 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -792,6 +792,7 @@ typedef struct hwif_s {
 	unsigned	no_dsc     : 1;	/* 0 default, 1 dsc_overlap disabled */
 	unsigned	auto_poll  : 1; /* supports nop auto-poll */
 	unsigned	sg_mapped  : 1;	/* sg_table and sg_nents are ready */
+	unsigned	no_io_32bit : 1; /* 1 = can not do 32-bit IO ops */
 
 	struct device	gendev;
 	struct completion gendev_rel_comp; /* To deal with device release() */

Re: RFC: Compact Flash True IDE Mode Driver

[Bartlomiej Zolnierkiewicz]

On 2/14/06, Kumar Gala <galak@kernel.crashing.org> wrote:
> If this looks good, I'll send a more official patch with an signed-off-by.

Looks good but please add some description and Signed-off-by.

Acked-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

You can send final patch to akpm for inclusion into -mm.

> - k
>
> diff --git a/drivers/ide/ide-disk.c b/drivers/ide/ide-disk.c
> index 09086b8..359f659 100644
> --- a/drivers/ide/ide-disk.c
> +++ b/drivers/ide/ide-disk.c
> @@ -977,8 +977,6 @@ static void idedisk_setup (ide_drive_t *
>                 ide_dma_verbose(drive);
>         printk("\n");
>
> -       drive->no_io_32bit = id->dword_io ? 1 : 0;
> -
>         /* write cache enabled? */
>         if ((id->csfo & 1) || (id->cfs_enable_1 & (1 << 5)))
>                 drive->wcache = 1;
> diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
> index 427d1c2..1b7b4c5 100644
> --- a/drivers/ide/ide-probe.c
> +++ b/drivers/ide/ide-probe.c
> @@ -858,6 +858,15 @@ static void probe_hwif(ide_hwif_t *hwif)
>                         }
>                 }
>         }
> +
> +       for (unit = 0; unit < MAX_DRIVES; ++unit) {
> +               ide_drive_t *drive = &hwif->drives[unit];
> +
> +               if (hwif->no_io_32bit)
> +                       drive->no_io_32bit = 1;
> +               else
> +                       drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
> +       }
>  }
>
>  static int hwif_init(ide_hwif_t *hwif);
> diff --git a/include/linux/ide.h b/include/linux/ide.h
> index a7fc4cc..8d2db41 100644
> --- a/include/linux/ide.h
> +++ b/include/linux/ide.h
> @@ -792,6 +792,7 @@ typedef struct hwif_s {
>         unsigned        no_dsc     : 1; /* 0 default, 1 dsc_overlap disabled */
>         unsigned        auto_poll  : 1; /* supports nop auto-poll */
>         unsigned        sg_mapped  : 1; /* sg_table and sg_nents are ready */
> +       unsigned        no_io_32bit : 1; /* 1 = can not do 32-bit IO ops */
>
>         struct device   gendev;
>         struct completion gendev_rel_comp; /* To deal with device release() */

Re: RFC: Compact Flash True IDE Mode Driver

[Kumar Gala]

On Tue, 14 Feb 2006, Alan Cox wrote:

> On Llu, 2006-02-13 at 11:35 +0100, Bartlomiej Zolnierkiewicz wrote:
> > > +static void cfide_outsl(unsigned long port, void *addr, u32 count)
> > > +{
> > > +       panic("outsl unsupported");
> > > +}
> > 
> > This will panic as soon as somebody tries to enable 32-bit I/O
> > using hdparm.  Please add ide_hwif_t.no_io_32bit flag and teach
> > ide-disk.c:ide_disk_setup() about it (separate patch).
> 
> Seems a lot of effort for little reward. Just make cfide_outsl generate
> word sized I/O instead. Ditto insl. Or even leave the panic. Only
> superusers can hack around with that value and they can equally crash
> the box a thousand other ways.

Well, there's a patch now and its pretty simple.  Now we have one less way 
superuser can kill things ;)

- k

Re: RFC: Compact Flash True IDE Mode Driver

[Alan Cox]

On Llu, 2006-02-13 at 11:35 +0100, Bartlomiej Zolnierkiewicz wrote:
> > +static void cfide_outsl(unsigned long port, void *addr, u32 count)
> > +{
> > +       panic("outsl unsupported");
> > +}
> 
> This will panic as soon as somebody tries to enable 32-bit I/O
> using hdparm.  Please add ide_hwif_t.no_io_32bit flag and teach
> ide-disk.c:ide_disk_setup() about it (separate patch).

Seems a lot of effort for little reward. Just make cfide_outsl generate
word sized I/O instead. Ditto insl. Or even leave the panic. Only
superusers can hack around with that value and they can equally crash
the box a thousand other ways.

Alan