ide-generic: handle probing of legacy io-ports v5

Avoid probing the io-ports in case an IDE PCI controller is present and it
uses the legacy iobases. If we still want to enforce the probing, we do

ide_generic.probe_mask=0x3f

on the kernel command line. The iobase checking code is
adapted from drivers/ata/pata_legacy.c after converting hex
pci ids into their corresponding macros in <linux/pci_ids.h>.

Also, check only BAR0/2 resources since those are guaranteed
by the workaround in drivers/pci/probe.c:pci_setup_device().

Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
[bart: trivial printk() fixups]
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 51 insertions, 4 deletions

diff --git a/drivers/ide/ide-generic.c b/drivers/ide/ide-generic.c
index 8fe8b5b9cf7d..0a3cb0c33ae5 100644
--- a/drivers/ide/ide-generic.c
+++ b/drivers/ide/ide-generic.c
@@ -19,6 +19,7 @@
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/ide.h>
+#include <linux/pci_ids.h>
 
 /* FIXME: convert m32r to use ide_platform host driver */
 #ifdef CONFIG_M32R
@@ -27,7 +28,7 @@
 
 #define DRV_NAME        "ide_generic"
 
-static int probe_mask = 0x03;
+static int probe_mask;
 module_param(probe_mask, int, 0);
 MODULE_PARM_DESC(probe_mask, "probe mask for legacy ISA IDE ports");
 
@@ -100,19 +101,65 @@ 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_legacy_iobases(int *primary, int *secondary)
+{
+        struct pci_dev *p = NULL;
+        u16 val;
+
+        for_each_pci_dev(p) {
+
+                if (pci_resource_start(p, 0) == 0x1f0)
+                        *primary = 1;
+                if (pci_resource_start(p, 2) == 0x170)
+                        *secondary = 1;
+
+                /* Cyrix CS55{1,2}0 pre SFF MWDMA ATA on the bridge */
+                if (p->vendor == PCI_VENDOR_ID_CYRIX &&
+                    (p->device == PCI_DEVICE_ID_CYRIX_5510 ||
+                     p->device == PCI_DEVICE_ID_CYRIX_5520))
+                        *primary = *secondary = 1;
+
+                /* Intel MPIIX - PIO ATA on non PCI side of bridge */
+                if (p->vendor == PCI_VENDOR_ID_INTEL &&
+                    p->device == PCI_DEVICE_ID_INTEL_82371MX) {
+
+                        pci_read_config_word(p, 0x6C, &val);
+                        if (val & 0x8000) {
+                                /* ATA port enabled */
+                                if (val & 0x4000)
+                                        *secondary = 1;
+                                else
+                                        *primary = 1;
+                        }
+                }
+        }
+}
+
 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())
                 return -ENODEV;
 #endif
-        printk(KERN_INFO DRV_NAME ": please use \"probe_mask=0x3f\" module "
-                         "parameter for probing all legacy ISA IDE ports\n");
+        ide_generic_check_pci_legacy_iobases(&primary, &secondary);
+
+        if (!probe_mask) {
+                printk(KERN_INFO DRV_NAME ": please use \"probe_mask=0x3f\" "
+                     "module parameter for probing all legacy ISA IDE ports\n");
+
+                if (primary == 0)
+                        probe_mask |= 0x1;
+
+                if (secondary == 0)
+                        probe_mask |= 0x2;
+        } else
+                printk(KERN_INFO DRV_NAME ": enforcing probing of I/O ports "
+                        "upon user request\n");
 
         memset(hws, 0, sizeof(hw_regs_t *) * MAX_HWIFS);