[PATCH 3/3] ARM: imx6: gw54xx: add fixup for PCIe switch

[Lucas Stach <l.stach@pengutronix.de>]

After the PCIe switch has been scanned its GPIOs need to be
configured as output-high to release the devices behind the
switch from their reset state and make them discoverable to
the bus scan.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
---
 arch/arm/boards/gateworks-ventana/board.c | 29 +++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/arch/arm/boards/gateworks-ventana/board.c b/arch/arm/boards/gateworks-ventana/board.c
index 3ff142ee4298..6f9e0343bed5 100644
--- a/arch/arm/boards/gateworks-ventana/board.c
+++ b/arch/arm/boards/gateworks-ventana/board.c
@@ -17,6 +17,7 @@
 #include <i2c/i2c.h>
 #include <init.h>
 #include <linux/marvell_phy.h>
+#include <linux/pci.h>
 #include <linux/phy.h>
 #include <mach/bbu.h>
 #include <mach/imx6.h>
@@ -111,3 +112,31 @@ static int gw54xx_coredevices_init(void)
 	return 0;
 }
 coredevice_initcall(gw54xx_coredevices_init);
+
+/*
+ * fixup for PLX PEX8909 bridge to configure GPIO1-7 as output High
+ * as they are used for slots1-7 PERST#
+ */
+static void ventana_pciesw_early_fixup(struct pci_dev *dev)
+{
+	u32 dw;
+
+	if (!of_machine_is_compatible("gw,ventana"))
+		return;
+
+	if (dev->devfn != 0)
+		return;
+
+	pci_read_config_dword(dev, 0x62c, &dw);
+	dw |= 0xaaa8; // GPIO1-7 outputs
+	pci_write_config_dword(dev, 0x62c, dw);
+
+	pci_read_config_dword(dev, 0x644, &dw);
+	dw |= 0xfe;   // GPIO1-7 output high
+	pci_write_config_dword(dev, 0x644, dw);
+
+	mdelay(100);
+}
+DECLARE_PCI_FIXUP_EARLY(0x10b5, 0x8609, ventana_pciesw_early_fixup);
+DECLARE_PCI_FIXUP_EARLY(0x10b5, 0x8606, ventana_pciesw_early_fixup);
+DECLARE_PCI_FIXUP_EARLY(0x10b5, 0x8604, ventana_pciesw_early_fixup);
-- 
2.18.0


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