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imx: ventana: add pci fixup for PLX PEX860x switch GPIO

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Most Gateworks Ventana boards use a PLX PEX860x PCIe switch for PCIe expansion.
These boards use GPIO on the PLX device as PERST# for the downstream ports
thus we assert this when the PLX is enumerated.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
This commit is contained in:
Tim Harvey 2014-08-07 22:49:57 -07:00 committed by Stefano Babic
parent 0991866cf7
commit dad08286ea
2 changed files with 31 additions and 0 deletions
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30
board/gateworks/gw_ventana/gw_ventana.c
View File

@ -31,6 +31,7 @@
#include <mmc.h>
#include <mtd_node.h>
#include <netdev.h>
#include <pci.h>
#include <power/pmic.h>
#include <power/ltc3676_pmic.h>
#include <power/pfuze100_pmic.h>
@ -1157,6 +1158,35 @@ int imx6_pcie_toggle_reset(void)
}
return 0;
}
/*
* Most Ventana boards have a PLX PEX860x PCIe switch onboard and use its
* GPIO's as PERST# signals for its downstream ports - configure the GPIO's
* properly and assert reset for 100ms.
*/
void board_pci_fixup_dev(struct pci_controller *hose, pci_dev_t dev,
unsigned short vendor, unsigned short device,
unsigned short class)
{
u32 dw;
debug("%s: %02d:%02d.%02d: %04x:%04x\n", __func__,
PCI_BUS(dev), PCI_DEV(dev), PCI_FUNC(dev), vendor, device);
if (vendor == PCI_VENDOR_ID_PLX &&
(device & 0xfff0) == 0x8600 &&
PCI_DEV(dev) == 0 && PCI_FUNC(dev) == 0) {
debug("configuring PLX 860X downstream PERST#\n");
pci_hose_read_config_dword(hose, dev, 0x62c, &dw);
dw |= 0xaaa8; /* GPIO1-7 outputs */
pci_hose_write_config_dword(hose, dev, 0x62c, dw);
pci_hose_read_config_dword(hose, dev, 0x644, &dw);
dw |= 0xfe; /* GPIO1-7 output high */
pci_hose_write_config_dword(hose, dev, 0x644, dw);
mdelay(100);
}
}
#endif /* CONFIG_CMD_PCI */
#ifdef CONFIG_SERIAL_TAG

1
include/configs/gw_ventana.h
View File

@ -141,6 +141,7 @@
#define CONFIG_PCI
#define CONFIG_PCI_PNP
#define CONFIG_PCI_SCAN_SHOW
#define CONFIG_PCI_FIXUP_DEV
#define CONFIG_PCIE_IMX
#endif