From 6a2fa284aee2981be2c7661b3757ce112de8d528 Mon Sep 17 00:00:00 2001 From: Stefan Roese Date: Mon, 25 Jan 2021 15:25:31 +0100 Subject: [PATCH] pci: pci_mvebu: Disable config access to PCI host bridge ports MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This patch changes the PCI config routines in the Armada XP / 38x driver to not allow access to the PCIe root ports. While updating the Armada XP based theadorable to the latest mainline and testing it with the DM PCI driver I noticed, that the PCI root bridge was being configured incorrectly. Resulting in the PCIe Intel WiFi was not working correctly in Linux. With this patch applied, all PCIe devices work without any issues in Linux again. Signed-off-by: Stefan Roese Cc: Marek Behún Cc: Phil Sutter Cc: Mario Six --- drivers/pci/pci_mvebu.c | 64 +++++++++++++++++------------------------ 1 file changed, 26 insertions(+), 38 deletions(-) diff --git a/drivers/pci/pci_mvebu.c b/drivers/pci/pci_mvebu.c index 374c4aa243..3ab03e3675 100644 --- a/drivers/pci/pci_mvebu.c +++ b/drivers/pci/pci_mvebu.c @@ -153,28 +153,21 @@ static int mvebu_pcie_read_config(const struct udevice *bus, pci_dev_t bdf, u32 reg; u32 data; - debug("PCIE CFG read: (b,d,f)=(%2d,%2d,%2d) ", - PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf)); + debug("PCIE CFG read: loc_bus=%d loc_dev=%d (b,d,f)=(%2d,%2d,%2d) ", + local_bus, local_dev, PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf)); - /* Only allow one other device besides the local one on the local bus */ - if (PCI_BUS(bdf) == local_bus && PCI_DEV(bdf) != local_dev) { - if (local_dev == 0 && PCI_DEV(bdf) != 1) { - debug("- out of range\n"); - /* - * If local dev is 0, the first other dev can - * only be 1 - */ - *valuep = pci_get_ff(size); - return 0; - } else if (local_dev != 0 && PCI_DEV(bdf) != 0) { - debug("- out of range\n"); - /* - * If local dev is not 0, the first other dev can - * only be 0 - */ - *valuep = pci_get_ff(size); - return 0; - } + /* Don't access the local host controller via this API */ + if (PCI_BUS(bdf) == local_bus && PCI_DEV(bdf) == local_dev) { + debug("- skipping host controller\n"); + *valuep = pci_get_ff(size); + return 0; + } + + /* If local dev is 0, the first other dev can only be 1 */ + if (PCI_BUS(bdf) == local_bus && local_dev == 0 && PCI_DEV(bdf) != 1) { + debug("- out of range\n"); + *valuep = pci_get_ff(size); + return 0; } /* write address */ @@ -196,25 +189,20 @@ static int mvebu_pcie_write_config(struct udevice *bus, pci_dev_t bdf, int local_dev = PCI_DEV(pcie->dev); u32 data; - debug("PCIE CFG write: (b,d,f)=(%2d,%2d,%2d) ", - PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf)); + debug("PCIE CFG write: loc_bus=%d loc_dev=%d (b,d,f)=(%2d,%2d,%2d) ", + local_bus, local_dev, PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf)); debug("(addr,val)=(0x%04x, 0x%08lx)\n", offset, value); - /* Only allow one other device besides the local one on the local bus */ - if (PCI_BUS(bdf) == local_bus && PCI_DEV(bdf) != local_dev) { - if (local_dev == 0 && PCI_DEV(bdf) != 1) { - /* - * If local dev is 0, the first other dev can - * only be 1 - */ - return 0; - } else if (local_dev != 0 && PCI_DEV(bdf) != 0) { - /* - * If local dev is not 0, the first other dev can - * only be 0 - */ - return 0; - } + /* Don't access the local host controller via this API */ + if (PCI_BUS(bdf) == local_bus && PCI_DEV(bdf) == local_dev) { + debug("- skipping host controller\n"); + return 0; + } + + /* If local dev is 0, the first other dev can only be 1 */ + if (PCI_BUS(bdf) == local_bus && local_dev == 0 && PCI_DEV(bdf) != 1) { + debug("- out of range\n"); + return 0; } writel(PCIE_CONF_ADDR(bdf, offset), pcie->base + PCIE_CONF_ADDR_OFF);