imx6: kernel: add GW16082 miniPCI Expansion Mezzanine support

The GW16082 miniPCI Expansion Mezzanine has the INTA/B/C/D IRQ's reversed
from the PCI standard. This will soon be resolved in the bootloader via
devicetree, but in the meantime this will work around the issue.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42146 3c298f89-4303-0410-b956-a3cf2f4a3e73

2 files changed, 114 insertions, 0 deletions

diff --git a/target/linux/imx6/patches-3.14/200-pci_designware_add-ability-for-custom-swizzle.patch b/target/linux/imx6/patches-3.14/200-pci_designware_add-ability-for-custom-swizzle.patch
new file mode 100644
index 0000000000..b174376860
--- /dev/null
+++ b/target/linux/imx6/patches-3.14/200-pci_designware_add-ability-for-custom-swizzle.patch
@@ -0,0 +1,33 @@
+commit e84634dc6c7f3f6af9b8ef1fb36f0d85c476ab95
+Author: Tim Harvey <tharvey@gateworks.com>
+Date:   Thu Feb 27 01:02:23 2014 -0800
+
+    PCI: designware: add ability for custom swizzle
+    
+    Add the ability for a platform driver to provide a platform-specific
+    swizzle function.
+    
+    Signed-off-by: Tim Harvey <tharvey@gateworks.com>
+
+--- a/drivers/pci/host/pcie-designware.c
++++ b/drivers/pci/host/pcie-designware.c
+@@ -481,6 +481,9 @@ int __init dw_pcie_host_init(struct pcie
+ 	if (pp->ops->host_init)
+ 		pp->ops->host_init(pp);
+ 
++	if (pp->swizzle)
++		dw_pci.swizzle = pp->swizzle;
++
+ 	dw_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0);
+ 
+ 	/* program correct class for RC */
+--- a/drivers/pci/host/pcie-designware.h
++++ b/drivers/pci/host/pcie-designware.h
+@@ -53,6 +53,7 @@ struct pcie_port {
+ 	struct irq_domain	*irq_domain;
+ 	unsigned long		msi_data;
+ 	DECLARE_BITMAP(msi_irq_in_use, MAX_MSI_IRQS);
++	u8			(*swizzle)(struct pci_dev *, u8 *);
+ };
+ 
+ struct pcie_host_ops {
diff --git a/target/linux/imx6/patches-3.14/201-pci_imx6_ventana_fixup-for-IRQ-mismapping.patch b/target/linux/imx6/patches-3.14/201-pci_imx6_ventana_fixup-for-IRQ-mismapping.patch
new file mode 100644
index 0000000000..c8e2a0e0e3
--- /dev/null
+++ b/target/linux/imx6/patches-3.14/201-pci_imx6_ventana_fixup-for-IRQ-mismapping.patch
@@ -0,0 +1,81 @@
+commit 2c0d0491438433a1f327f2e754c7b6b55fec51c4
+Author: Tim Harvey <tharvey@gateworks.com>
+Date:   Thu Feb 27 00:59:53 2014 -0800
+
+    PCI: imx6: ventana: fixup for IRQ mismapping
+    
+    The TI XIO2001 PCIe-to-PCI bridge used on several Ventana expansion boards
+    has its slot-to-bridge IRQ mapping reversed from the PCI specification:
+    
+      INTA->INTD
+      INTB->INTC
+      INTC->INTB
+      INTD->INTA
+    
+    Implement a custom swizzle function that does a fixup on the interrupt for
+    devices on a TI XIO2001 bridge.
+    
+    Signed-off-by: Tim Harvey <tharvey@gateworks.com>
+
+--- a/drivers/pci/host/pci-imx6.c
++++ b/drivers/pci/host/pci-imx6.c
+@@ -540,6 +540,39 @@ static int imx6_add_pcie_port(struct pci
+ 	return 0;
+ }
+ 
++/* TI XIO2001 PCIe-to-PCI bridge on GW16082 exp card has IRQs reversed */
++u8 ventana_swizzle(struct pci_dev *dev, u8 *pin)
++{
++	u8 i = 0;
++	struct pci_dev *pdev = dev;
++
++	/* count number of TI XIO2001 bridges on bus */
++	while (!pci_is_root_bus(pdev->bus)) {
++		if (pdev->bus && pdev->bus->self &&
++		    (pdev->bus->self->vendor == PCI_VENDOR_ID_TI) &&
++		    (pdev->bus->self->device == PCI_DEVICE_ID_TI_XIO2001)) {
++			i++;
++		}
++		pdev = pdev->bus->self;
++	}
++	while (!pci_is_root_bus(dev->bus)) {
++		/* if we are directly downstream from 1st TI XIO2001 bridge */
++		if (dev->bus && dev->bus->self &&
++		    (dev->bus->self->vendor == PCI_VENDOR_ID_TI) &&
++		    (dev->bus->self->device == PCI_DEVICE_ID_TI_XIO2001)) {
++			if (--i == 0) {
++				/* swap IRQs and swizzle backwards */
++				*pin = (15 - PCI_SLOT(dev->devfn)) + 1;
++				dev = dev->bus->self;
++				continue;
++			}
++		}
++		*pin = pci_swizzle_interrupt_pin(dev, *pin);
++		dev = dev->bus->self;
++	}
++	return PCI_SLOT(dev->devfn);
++}
++
+ static int __init imx6_pcie_probe(struct platform_device *pdev)
+ {
+ 	struct imx6_pcie *imx6_pcie;
+@@ -648,6 +681,9 @@ static int __init imx6_pcie_probe(struct
+ 		return PTR_ERR(imx6_pcie->iomuxc_gpr);
+ 	}
+ 
++	if (of_machine_is_compatible("gw,ventana"))
++		pp->swizzle = ventana_swizzle;
++
+ 	ret = imx6_add_pcie_port(pp, pdev);
+ 	if (ret < 0)
+ 		return ret;
+--- a/include/linux/pci_ids.h
++++ b/include/linux/pci_ids.h
+@@ -822,6 +822,7 @@
+ #define PCI_DEVICE_ID_TI_XX12		0x8039
+ #define PCI_DEVICE_ID_TI_XX12_FM	0x803b
+ #define PCI_DEVICE_ID_TI_XIO2000A	0x8231
++#define PCI_DEVICE_ID_TI_XIO2001	0x8240
+ #define PCI_DEVICE_ID_TI_1130		0xac12
+ #define PCI_DEVICE_ID_TI_1031		0xac13
+ #define PCI_DEVICE_ID_TI_1131		0xac15