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 --- board/gateworks/gw_ventana/gw_ventana.c | 30 ++++++++++++++++++++++++++++++ include/configs/gw_ventana.h | 1 + 2 files changed, 31 insertions(+)
diff --git a/board/gateworks/gw_ventana/gw_ventana.c b/board/gateworks/gw_ventana/gw_ventana.c index 70b90d8..186cd38 100644 --- a/board/gateworks/gw_ventana/gw_ventana.c +++ b/board/gateworks/gw_ventana/gw_ventana.c @@ -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> @@ -1092,6 +1093,35 @@ 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 diff --git a/include/configs/gw_ventana.h b/include/configs/gw_ventana.h index b991b09..0e5c200 100644 --- a/include/configs/gw_ventana.h +++ b/include/configs/gw_ventana.h @@ -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