x86, intel-mid: Add Merrifield platform support

This code was partially based on Mark Brown's previous work.

Signed-off-by: David Cohen <david.a.cohen@linux.intel.com>
Link: http://lkml.kernel.org/r/1387224459-25746-4-git-send-email-david.a.cohen@linux.intel.com
Signed-off-by: Fei Yang <fei.yang@intel.com>
Cc: Mark F. Brown <mark.f.brown@intel.com>
Cc: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/arch/x86/pci/intel_mid_pci.c b/arch/x86/pci/intel_mid_pci.c
index 51384ca727ad..84b9d672843d 100644
--- a/arch/x86/pci/intel_mid_pci.c
+++ b/arch/x86/pci/intel_mid_pci.c
@@ -31,6 +31,7 @@
 #include <asm/pci_x86.h>
 #include <asm/hw_irq.h>
 #include <asm/io_apic.h>
+#include <asm/intel-mid.h>
 
 #define PCIE_CAP_OFFSET 0x100
 
@@ -219,7 +220,10 @@ static int intel_mid_pci_irq_enable(struct pci_dev *dev)
         irq_attr.ioapic = mp_find_ioapic(dev->irq);
         irq_attr.ioapic_pin = dev->irq;
         irq_attr.trigger = 1; /* level */
-        irq_attr.polarity = 1; /* active low */
+        if (intel_mid_identify_cpu() == INTEL_MID_CPU_CHIP_TANGIER)
+                irq_attr.polarity = 0; /* active high */
+        else
+                irq_attr.polarity = 1; /* active low */
         io_apic_set_pci_routing(&dev->dev, dev->irq, &irq_attr);
 
         return 0;