[PATCH 4/4] imx: add PCI fixup for PEX860X on Gateworks board
From: tharvey@gateworks.com (Tim Harvey)
Date: 2013-10-23 04:51:28
Also in:
linux-devicetree
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
Possibly related (same subject, not in this thread)
- 2013-10-23 · Re: [PATCH 4/4] imx: add PCI fixup for PEX860X on Gateworks board · Shawn Guo <hidden>
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> --- arch/arm/mach-imx/mach-imx6q.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+)
diff --git a/arch/arm/mach-imx/mach-imx6q.c b/arch/arm/mach-imx/mach-imx6q.c
index 0f9f241..eb5747f 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/opp.h> +#include <linux/pci.h> #include <linux/phy.h> #include <linux/reboot.h> #include <linux/regmap.h>
@@ -78,6 +80,37 @@ 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 mx6_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, + mx6_ventana_pciesw_early_fixup); +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8606, + mx6_ventana_pciesw_early_fixup); +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8604, + mx6_ventana_pciesw_early_fixup); + static int ar8031_phy_fixup(struct phy_device *dev) { u16 val;
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1.7.9.5