68 lines
2 KiB
Diff
68 lines
2 KiB
Diff
From 4bb1d09fe48f51efac2f51b9280796e2d00a6c4a Mon Sep 17 00:00:00 2001
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From: Tim Harvey <tharvey@gateworks.com>
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Date: Tue, 22 Oct 2013 21:51:28 -0700
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Subject: [PATCH] ARM: imx: add PCI fixup for PEX860X on Gateworks board
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The PEX860X has GPIO's which are used for PCI Reset lines on the
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Gateworks Ventana boards. The GPIO's need to be set as output
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level high so as to allow the PCIe devices to come out of reset.
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Signed-off-by: Tim Harvey <tharvey@gateworks.com>
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Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
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---
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arch/arm/mach-imx/mach-imx6q.c | 30 ++++++++++++++++++++++++++++++
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1 file changed, 30 insertions(+)
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--- a/arch/arm/mach-imx/mach-imx6q.c
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+++ b/arch/arm/mach-imx/mach-imx6q.c
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@@ -13,6 +13,7 @@
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#include <linux/clk.h>
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#include <linux/clkdev.h>
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#include <linux/cpu.h>
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+#include <linux/delay.h>
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#include <linux/export.h>
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#include <linux/init.h>
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#include <linux/io.h>
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@@ -23,6 +24,7 @@
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#include <linux/of_irq.h>
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#include <linux/of_platform.h>
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#include <linux/pm_opp.h>
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+#include <linux/pci.h>
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#include <linux/phy.h>
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#include <linux/reboot.h>
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#include <linux/regmap.h>
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@@ -78,6 +80,34 @@ static int ksz9031rn_phy_fixup(struct ph
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return 0;
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}
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+/*
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+ * fixup for PLX PEX8909 bridge to configure GPIO1-7 as output High
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+ * as they are used for slots1-7 PERST#
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+ */
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+static void ventana_pciesw_early_fixup(struct pci_dev *dev)
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+{
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+ u32 dw;
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+
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+ if (!of_machine_is_compatible("gw,ventana"))
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+ return;
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+
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+ if (dev->devfn != 0)
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+ return;
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+
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+ pci_read_config_dword(dev, 0x62c, &dw);
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+ dw |= 0xaaa8; // GPIO1-7 outputs
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+ pci_write_config_dword(dev, 0x62c, dw);
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+
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+ pci_read_config_dword(dev, 0x644, &dw);
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+ dw |= 0xfe; // GPIO1-7 output high
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+ pci_write_config_dword(dev, 0x644, dw);
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+
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+ msleep(100);
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+}
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+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8609, ventana_pciesw_early_fixup);
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+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8606, ventana_pciesw_early_fixup);
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+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8604, ventana_pciesw_early_fixup);
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+
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static int ar8031_phy_fixup(struct phy_device *dev)
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{
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u16 val;
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