From: Rob Herring Date: Fri, 21 Aug 2020 03:53:53 +0000 (-0600) Subject: PCI: dwc: Use generic config accessors X-Git-Tag: v5.10-rc1~58^2~14^2~46 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=c2b0c098fbd15da06f5c6c70ecc9b156fdc0eedd;p=linux-block.git PCI: dwc: Use generic config accessors Now that all the platforms with custom config access handling define their own pci_ops, let's split the default config accessors to use different pci_ops for root and child buses. With this, we can use the generic config accessors. The child bus accesses mainly require a .map_bus() hook to reconfigure the iATU on each config space access. Link: https://lore.kernel.org/r/20200821035420.380495-14-robh@kernel.org Signed-off-by: Rob Herring Signed-off-by: Lorenzo Pieralisi Cc: Jingoo Han Cc: Gustavo Pimentel Cc: Lorenzo Pieralisi Cc: Bjorn Helgaas --- diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c index 09071daf41ec..14ffc2cd88be 100644 --- a/drivers/pci/controller/dwc/pcie-designware-host.c +++ b/drivers/pci/controller/dwc/pcie-designware-host.c @@ -20,24 +20,7 @@ #include "pcie-designware.h" static struct pci_ops dw_pcie_ops; - -static int dw_pcie_rd_own_conf(struct pcie_port *pp, int where, int size, - u32 *val) -{ - struct dw_pcie *pci; - - pci = to_dw_pcie_from_pp(pp); - return dw_pcie_read(pci->dbi_base + where, size, val); -} - -static int dw_pcie_wr_own_conf(struct pcie_port *pp, int where, int size, - u32 val) -{ - struct dw_pcie *pci; - - pci = to_dw_pcie_from_pp(pp); - return dw_pcie_write(pci->dbi_base + where, size, val); -} +static struct pci_ops dw_child_pcie_ops; static void dw_msi_ack_irq(struct irq_data *d) { @@ -443,7 +426,7 @@ int dw_pcie_host_init(struct pcie_port *pp) /* Set default bus ops */ bridge->ops = &dw_pcie_ops; - bridge->child_ops = &dw_pcie_ops; + bridge->child_ops = &dw_child_pcie_ops; if (pp->ops->host_init) { ret = pp->ops->host_init(pp); @@ -487,14 +470,14 @@ void dw_pcie_host_deinit(struct pcie_port *pp) } EXPORT_SYMBOL_GPL(dw_pcie_host_deinit); -static int dw_pcie_access_other_conf(struct pcie_port *pp, struct pci_bus *bus, - u32 devfn, int where, int size, u32 *val, - bool write) +static void __iomem *dw_pcie_other_conf_map_bus(struct pci_bus *bus, + unsigned int devfn, int where) { - int ret, type; + int type; u32 busdev, cfg_size; u64 cpu_addr; void __iomem *va_cfg_base; + struct pcie_port *pp = bus->sysdata; struct dw_pcie *pci = to_dw_pcie_from_pp(pp); busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) | @@ -515,79 +498,50 @@ static int dw_pcie_access_other_conf(struct pcie_port *pp, struct pci_bus *bus, dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX1, type, cpu_addr, busdev, cfg_size); - if (write) - ret = dw_pcie_write(va_cfg_base + where, size, *val); - else - ret = dw_pcie_read(va_cfg_base + where, size, val); - if (pci->num_viewport <= 2) - dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX1, - PCIE_ATU_TYPE_IO, pp->io_base, - pp->io_bus_addr, pp->io_size); - - return ret; -} - -static int dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus, - u32 devfn, int where, int size, u32 *val) -{ - return dw_pcie_access_other_conf(pp, bus, devfn, where, size, val, - false); + return va_cfg_base + where; } -static int dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus, - u32 devfn, int where, int size, u32 val) -{ - return dw_pcie_access_other_conf(pp, bus, devfn, where, size, &val, - true); -} - -static int dw_pcie_valid_device(struct pcie_port *pp, struct pci_bus *bus, - int dev) -{ - struct dw_pcie *pci = to_dw_pcie_from_pp(pp); - - /* If there is no link, then there is no device */ - if (!pci_is_root_bus(bus)) { - if (!dw_pcie_link_up(pci)) - return 0; - } else if (dev > 0) - /* Access only one slot on each root port */ - return 0; - - return 1; -} - -static int dw_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where, - int size, u32 *val) +static int dw_pcie_rd_other_conf(struct pci_bus *bus, unsigned int devfn, + int where, int size, u32 *val) { + int ret; struct pcie_port *pp = bus->sysdata; + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); - if (!dw_pcie_valid_device(pp, bus, PCI_SLOT(devfn))) { - *val = 0xffffffff; - return PCIBIOS_DEVICE_NOT_FOUND; - } + ret = pci_generic_config_read(bus, devfn, where, size, val); - if (pci_is_root_bus(bus)) - return dw_pcie_rd_own_conf(pp, where, size, val); + if (!ret && pci->num_viewport <= 2) + dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX1, + PCIE_ATU_TYPE_IO, pp->io_base, + pp->io_bus_addr, pp->io_size); - return dw_pcie_rd_other_conf(pp, bus, devfn, where, size, val); + return ret; } -static int dw_pcie_wr_conf(struct pci_bus *bus, u32 devfn, - int where, int size, u32 val) +static int dw_pcie_wr_other_conf(struct pci_bus *bus, unsigned int devfn, + int where, int size, u32 val) { + int ret; struct pcie_port *pp = bus->sysdata; + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); - if (!dw_pcie_valid_device(pp, bus, PCI_SLOT(devfn))) - return PCIBIOS_DEVICE_NOT_FOUND; + ret = pci_generic_config_write(bus, devfn, where, size, val); - if (pci_is_root_bus(bus)) - return dw_pcie_wr_own_conf(pp, where, size, val); + if (!ret && pci->num_viewport <= 2) + dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX1, + PCIE_ATU_TYPE_IO, pp->io_base, + pp->io_bus_addr, pp->io_size); - return dw_pcie_wr_other_conf(pp, bus, devfn, where, size, val); + return ret; } +static struct pci_ops dw_child_pcie_ops = { + .map_bus = dw_pcie_other_conf_map_bus, + .read = dw_pcie_rd_other_conf, + .write = dw_pcie_wr_other_conf, +}; + void __iomem *dw_pcie_own_conf_map_bus(struct pci_bus *bus, unsigned int devfn, int where) { struct pcie_port *pp = bus->sysdata; @@ -601,8 +555,9 @@ void __iomem *dw_pcie_own_conf_map_bus(struct pci_bus *bus, unsigned int devfn, EXPORT_SYMBOL_GPL(dw_pcie_own_conf_map_bus); static struct pci_ops dw_pcie_ops = { - .read = dw_pcie_rd_conf, - .write = dw_pcie_wr_conf, + .map_bus = dw_pcie_own_conf_map_bus, + .read = pci_generic_config_read, + .write = pci_generic_config_write, }; void dw_pcie_setup_rc(struct pcie_port *pp) @@ -661,7 +616,7 @@ void dw_pcie_setup_rc(struct pcie_port *pp) * the platform uses its own address translation component rather than * ATU, so we should not program the ATU here. */ - if (pp->bridge->child_ops == &dw_pcie_ops && !pp->ops->rd_other_conf) { + if (pp->bridge->child_ops == &dw_child_pcie_ops) { dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX0, PCIE_ATU_TYPE_MEM, pp->mem_base, pp->mem_bus_addr, pp->mem_size);