diff options
Diffstat (limited to 'target/linux/bcm53xx/patches-4.1/041-PCI-iproc-Allow-multiple-devices-except-on-PAXC.patch')
| -rw-r--r-- | target/linux/bcm53xx/patches-4.1/041-PCI-iproc-Allow-multiple-devices-except-on-PAXC.patch | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/target/linux/bcm53xx/patches-4.1/041-PCI-iproc-Allow-multiple-devices-except-on-PAXC.patch b/target/linux/bcm53xx/patches-4.1/041-PCI-iproc-Allow-multiple-devices-except-on-PAXC.patch new file mode 100644 index 0000000000..1955c01806 --- /dev/null +++ b/target/linux/bcm53xx/patches-4.1/041-PCI-iproc-Allow-multiple-devices-except-on-PAXC.patch @@ -0,0 +1,83 @@ +From 46560388c476c8471fde7712c10f9fad8d0d1875 Mon Sep 17 00:00:00 2001 +From: Ray Jui <rjui@broadcom.com> +Date: Wed, 27 Jan 2016 16:52:24 -0600 +Subject: [PATCH] PCI: iproc: Allow multiple devices except on PAXC + +Commit 943ebae781f5 ("PCI: iproc: Add PAXC interface support") only allowed +device 0, which is a regression on BCMA-based platforms. + +All systems support only one device, a Root Port at 00:00.0, on the root +bus. PAXC-based systems support only the Root Port (00:00.0) and a single +device (with multiple functions) below it, e.g., 01:00.0, 01:00.1, etc. +Non-PAXC systems support arbitrary devices below the Root Port. + +[bhelgaas: changelog, fold in removal of MAX_NUM_PAXC_PF check] +Fixes: 943ebae781f5 ("PCI: iproc: Add PAXC interface support") +Reported-by: Rafal Milecki <zajec5@gmail.com> +Signed-off-by: Ray Jui <rjui@broadcom.com> +Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> +--- + drivers/pci/host/pcie-iproc.c | 29 +++++++++++------------------ + 1 file changed, 11 insertions(+), 18 deletions(-) + +--- a/drivers/pci/host/pcie-iproc.c ++++ b/drivers/pci/host/pcie-iproc.c +@@ -64,7 +64,6 @@ + #define OARR_SIZE_CFG BIT(OARR_SIZE_CFG_SHIFT) + + #define MAX_NUM_OB_WINDOWS 2 +-#define MAX_NUM_PAXC_PF 4 + + #define IPROC_PCIE_REG_INVALID 0xffff + +@@ -170,20 +169,6 @@ static inline void iproc_pcie_ob_write(struct iproc_pcie *pcie, + writel(val, pcie->base + offset + (window * 8)); + } + +-static inline bool iproc_pcie_device_is_valid(struct iproc_pcie *pcie, +- unsigned int slot, +- unsigned int fn) +-{ +- if (slot > 0) +- return false; +- +- /* PAXC can only support limited number of functions */ +- if (pcie->type == IPROC_PCIE_PAXC && fn >= MAX_NUM_PAXC_PF) +- return false; +- +- return true; +-} +- + /** + * Note access to the configuration registers are protected at the higher layer + * by 'pci_lock' in drivers/pci/access.c +@@ -199,11 +184,11 @@ static void __iomem *iproc_pcie_map_cfg_bus(struct pci_bus *bus, + u32 val; + u16 offset; + +- if (!iproc_pcie_device_is_valid(pcie, slot, fn)) +- return NULL; +- + /* root complex access */ + if (busno == 0) { ++ if (slot > 0 || fn > 0) ++ return NULL; ++ + iproc_pcie_write_reg(pcie, IPROC_PCIE_CFG_IND_ADDR, + where & CFG_IND_ADDR_MASK); + offset = iproc_pcie_reg_offset(pcie, IPROC_PCIE_CFG_IND_DATA); +@@ -213,6 +198,14 @@ static void __iomem *iproc_pcie_map_cfg_bus(struct pci_bus *bus, + return (pcie->base + offset); + } + ++ /* ++ * PAXC is connected to an internally emulated EP within the SoC. It ++ * allows only one device. ++ */ ++ if (pcie->type == IPROC_PCIE_PAXC) ++ if (slot > 0) ++ return NULL; ++ + /* EP device access */ + val = (busno << CFG_ADDR_BUS_NUM_SHIFT) | + (slot << CFG_ADDR_DEV_NUM_SHIFT) | |