From 4bb1d09fe48f51efac2f51b9280796e2d00a6c4a Mon Sep 17 00:00:00 2001
From: Tim Harvey <tharvey@gateworks.com>
Date: Tue, 22 Oct 2013 21:51:28 -0700
Subject: ARM: imx: add PCI fixup for PEX860X on Gateworks board

The PEX860X has GPIO's which are used for PCI Reset lines on the
Gateworks Ventana boards.  The GPIO's need to be set as output
level high so as to allow the PCIe devices to come out of reset.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
---
 arch/arm/mach-imx/mach-imx6q.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

(limited to 'arch/arm')

diff --git a/arch/arm/mach-imx/mach-imx6q.c b/arch/arm/mach-imx/mach-imx6q.c
index d0cfb225ec9a..7e5ec34894e2 100644
--- a/arch/arm/mach-imx/mach-imx6q.c
+++ b/arch/arm/mach-imx/mach-imx6q.c
@@ -13,6 +13,7 @@
 #include <linux/clk.h>
 #include <linux/clkdev.h>
 #include <linux/cpu.h>
+#include <linux/delay.h>
 #include <linux/export.h>
 #include <linux/init.h>
 #include <linux/io.h>
@@ -23,6 +24,7 @@
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
 #include <linux/pm_opp.h>
+#include <linux/pci.h>
 #include <linux/phy.h>
 #include <linux/reboot.h>
 #include <linux/regmap.h>
@@ -78,6 +80,34 @@ static int ksz9031rn_phy_fixup(struct phy_device *dev)
 	return 0;
 }
 
+/*
+ * 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);
+
+	msleep(100);
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8609, ventana_pciesw_early_fixup);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8606, ventana_pciesw_early_fixup);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8604, ventana_pciesw_early_fixup);
+
 static int ar8031_phy_fixup(struct phy_device *dev)
 {
 	u16 val;
-- 
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