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Message-ID: <20080801054831.GA14636@gollum.tnic>
Date: Fri, 1 Aug 2008 07:48:32 +0200
From: Borislav Petkov <petkovbb@...glemail.com>
To: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc: linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: [PATCH] ide-generic: skip automatic probing of legacy iobases
(was: Re: [PATCH] ide-floppy fix)
[ removed stable@...nel.org from the CC-list ]
On Wed, Jul 23, 2008 at 08:51:11PM +0200, Bartlomiej Zolnierkiewicz wrote:
> On Wednesday 23 July 2008, Borislav Petkov wrote:
>
> [...]
>
> > > Now it should be finally fixed.
> >
> > True story. Works here too.
>
> Thanks for verifying it.
>
> > Hm, let's see whether there's time during the weekend. I already have something
> > stolen from pata_legacy but I'll do some more testing first. By the way, what
> > are the chances of exporting those pieces of code from drivers/ata/pata_legacy.c
> > and adding the function def into some header instead of duplicating the code into
> > ide_generic.c?
>
> Good idea (<linux/ata.h> sounds like a perfect spot).
Hi Bart,
i finally found some time to work on the iobase-exclusion. Actually, i dropped
the original idea of reusing pata_legacy code without duplicating it since this
got the whole SATA pulled in in Kconfig, which, imo, outweighs the savings from
not duplicating one function. I ended up refitting the pata_legacy iobase checks
into ide-generic.
As a result, i have now a new bool-Kconfig option BLK_DEV_GENERIC_ONLY which
gets reverse-selected only when no pci ide controller which is using the generic
ide_host_register() from within ide_pci_init_one() is selected in Kconfig. This
is tested both with and without a pci ide driver selected in addition to
ide-generic.
---
From: Borislav Petkov <petkovbb@...il.com>
Date: Fri, 1 Aug 2008 07:33:13 +0200
Subject: [PATCH] ide-generic: skip automatic probing of legacy iobases
A number of pci ide controllers use legacy IO bases for their primary
and secondary ports. Skip probing those when both a specific host
driver _and_ ide-generic are enabled. The checking code originates from
drivers/ata/pata_legacy.c and is only reorganized into ide-generic.
Signed-off-by: Borislav Petkov <petkovbb@...il.com>
---
drivers/ide/Kconfig | 4 +++
drivers/ide/ide-generic.c | 49 +++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 51 insertions(+), 2 deletions(-)
diff --git a/drivers/ide/Kconfig b/drivers/ide/Kconfig
index 611319b..f103f5f 100644
--- a/drivers/ide/Kconfig
+++ b/drivers/ide/Kconfig
@@ -386,10 +386,14 @@ config BLK_DEV_OFFBOARD
config BLK_DEV_GENERIC
tristate "Generic PCI IDE Chipset Support"
select BLK_DEV_IDEPCI
+ select BLK_DEV_GENERIC_ONLY if !(BLK_DEV_AEC62XX || BLK_DEV_ALI15X3 || BLK_DEV_AMD74XX || BLK_DEV_ATIIXP || BLK_DEV_CMD64X || BLK_DEV_CS5530 || BLK_DEV_CS5535 || BLK_DEV_HPT34X || BLK_DEV_HPT366 || BLK_DEV_IT821X || BLK_DEV_IT8213 || BLK_DEV_JMICRON || BLK_DEV_NS87415 || BLK_DEV_OPTI621 || BLK_DEV_PDC202XX_OLD || BLK_DEV_PDC202XX_NEW || BLK_DEV_PIIX || BLK_DEV_RZ1000 || BLK_DEV_SC1200 || BLK_DEV_SVWKS || BLK_DEV_SIIMAGE || BLK_DEV_SIS5513 || BLK_DEV_SL82C105 || BLK_DEV_SLC90E66 || BLK_DEV_TC86C001 || BLK_DEV_TRIFLEX || BLK_DEV_TRM290 || BLK_DEV_VIA82CXXX)
help
This option provides generic support for various PCI IDE Chipsets
which otherwise might not be supported.
+config BLK_DEV_GENERIC_ONLY
+ bool
+
config BLK_DEV_OPTI621
tristate "OPTi 82C621 chipset enhanced support (EXPERIMENTAL)"
depends on EXPERIMENTAL
diff --git a/drivers/ide/ide-generic.c b/drivers/ide/ide-generic.c
index 8fe8b5b..3ce78f9 100644
--- a/drivers/ide/ide-generic.c
+++ b/drivers/ide/ide-generic.c
@@ -100,12 +100,55 @@ static const u16 legacy_bases[] = { 0x1f0, 0x170, 0x1e8, 0x168, 0x1e0, 0x160 };
static const int legacy_irqs[] = { 14, 15, 11, 10, 8, 12 };
#endif
+static void ide_generic_check_pci_uses_legacy_iobases(int *primary,
+ int *secondary)
+{
+
+#if !defined(CONFIG_BLK_DEV_GENERIC_ONLY)
+ struct pci_dev *p = NULL;
+ u16 val;
+
+ for_each_pci_dev(p) {
+ int r;
+
+ for (r = 0; r < 6; r++) {
+ if (pci_resource_start(p, r) == 0x1f0)
+ *primary = 1;
+ if (pci_resource_start(p, r) == 0x170)
+ *secondary = 1;
+ }
+
+ /* Cyrix CS5510 pre SFF MWDMA ATA on the bridge */
+ if (p->vendor == 0x1078 && p->device == 0x0000)
+ *primary = *secondary = 1;
+
+ /* Cyrix CS5520 pre SFF MWDMA ATA on the bridge */
+ if (p->vendor == 0x1078 && p->device == 0x0002)
+ *primary = *secondary = 1;
+
+ /* Intel MPIIX - PIO ATA on non PCI side of bridge */
+ if (p->vendor == 0x8086 && p->device == 0x1234) {
+
+ pci_read_config_word(p, 0x6C, &val);
+ if (val & 0x8000) {
+ /* ATA port enabled */
+ if (val & 0x4000)
+ *secondary = 1;
+ else
+ *primary = 1;
+ }
+ }
+ }
+#endif
+
+}
+
static int __init ide_generic_init(void)
{
hw_regs_t hw[MAX_HWIFS], *hws[MAX_HWIFS];
struct ide_host *host;
unsigned long io_addr;
- int i, rc;
+ int i, rc, primary = 0, secondary = 0;
#ifdef CONFIG_MIPS
if (!ide_probe_legacy())
@@ -116,7 +159,9 @@ static int __init ide_generic_init(void)
memset(hws, 0, sizeof(hw_regs_t *) * MAX_HWIFS);
- for (i = 0; i < ARRAY_SIZE(legacy_bases); i++) {
+ ide_generic_check_pci_uses_legacy_iobases(&primary, &secondary);
+
+ for (i = primary + secondary; i < ARRAY_SIZE(legacy_bases); i++) {
io_addr = legacy_bases[i];
hws[i] = NULL;
--
1.5.5.4
--
Regards/Gruss,
Boris.
--
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