[PATCH v5 2/5] PCI: designware: Add ARM64 support
Lorenzo Pieralisi
lorenzo.pieralisi at arm.com
Wed Jul 29 10:24:24 PDT 2015
On Sat, Jul 25, 2015 at 04:21:23AM +0100, Zhou Wang wrote:
> This patch tries to unify ARM32 and ARM64 PCIe in designware driver. Delete
> function dw_pcie_setup, dw_pcie_scan_bus, dw_pcie_map_irq and struct hw_pci,
> move related operations to dw_pcie_host_init. Also set pp->root_bus_nr = 0 in
> each PCIe host driver which is based on pcie-designware. This patch also try
Memory for ports is kzalloc'ed, so there is no need to zero it. I still
think that you should explain the root_bus_nr setting to 0 a bit
better, why you make the change and why it is safe.
[...]
> -int dw_pcie_host_init(struct pcie_port *pp)
> +int __init dw_pcie_host_init(struct pcie_port *pp)
> {
> struct device_node *np = pp->dev->of_node;
> struct platform_device *pdev = to_platform_device(pp->dev);
> - struct of_pci_range range;
> - struct of_pci_range_parser parser;
> + struct pci_bus *bus;
> struct resource *cfg_res;
> - u32 val, na, ns;
> + LIST_HEAD(res);
> + u32 val, ns;
> const __be32 *addrp;
> int i, index, ret;
> + struct resource_entry *win;
>
> - /* Find the address cell size and the number of cells in order to get
> - * the untranslated address.
> - */
> - of_property_read_u32(np, "#address-cells", &na);
> + /* Find the number of cells in order to get the untranslated address */
> ns = of_n_size_cells(np);
>
> cfg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config");
> @@ -392,78 +382,62 @@ int dw_pcie_host_init(struct pcie_port *pp)
> dev_err(pp->dev, "missing *config* reg space\n");
> }
>
> - if (of_pci_range_parser_init(&parser, np)) {
> - dev_err(pp->dev, "missing ranges property\n");
> - return -EINVAL;
> - }
> + ret = of_pci_get_host_bridge_resources(np, 0, 0xff, &res, &pp->io_base);
> + if (ret)
> + return ret;
>
> /* Get the I/O and memory ranges from DT */
> - for_each_of_pci_range(&parser, &range) {
> - unsigned long restype = range.flags & IORESOURCE_TYPE_BITS;
> -
> - if (restype == IORESOURCE_IO) {
> - of_pci_range_to_resource(&range, np, &pp->io);
> - pp->io.name = "I/O";
> - pp->io.start = max_t(resource_size_t,
> - PCIBIOS_MIN_IO,
> - range.pci_addr + global_io_offset);
> - pp->io.end = min_t(resource_size_t,
> - IO_SPACE_LIMIT,
> - range.pci_addr + range.size
> - + global_io_offset - 1);
> - pp->io_size = resource_size(&pp->io);
> - pp->io_bus_addr = range.pci_addr;
> - pp->io_base = range.cpu_addr;
> -
> - /* Find the untranslated IO space address */
> - pp->io_mod_base = of_read_number(parser.range -
> - parser.np + na, ns);
> - }
> - if (restype == IORESOURCE_MEM) {
> - of_pci_range_to_resource(&range, np, &pp->mem);
> - pp->mem.name = "MEM";
> - pp->mem_size = resource_size(&pp->mem);
> - pp->mem_bus_addr = range.pci_addr;
> -
> - /* Find the untranslated MEM space address */
> - pp->mem_mod_base = of_read_number(parser.range -
> - parser.np + na, ns);
> - }
> - if (restype == 0) {
> - of_pci_range_to_resource(&range, np, &pp->cfg);
> - pp->cfg0_size = resource_size(&pp->cfg)/2;
> - pp->cfg1_size = resource_size(&pp->cfg)/2;
> - pp->cfg0_base = pp->cfg.start;
> - pp->cfg1_base = pp->cfg.start + pp->cfg0_size;
> + resource_list_for_each_entry(win, &res) {
> + switch (resource_type(win->res)) {
> + case IORESOURCE_IO:
> + pp->io = win->res;
> + pp->io->name = "I/O";
> + pp->io_size = resource_size(pp->io);
> + pp->io_bus_addr = pp->io->start - win->offset;
> + pp->io_mod_base = win->__res.start;
> + ret = pci_remap_iospace(pp->io, pp->io_base);
> + if (ret) {
> + dev_warn(pp->dev, "error %d: failed to map resource %pR\n",
> + ret, pp->io);
> + continue;
> + }
> + break;
> + case IORESOURCE_MEM:
> + pp->mem = win->res;
> + pp->mem->name = "MEM";
> + pp->mem_size = resource_size(pp->mem);
> + pp->mem_bus_addr = pp->mem->start - win->offset;
> + pp->mem_mod_base = win->__res.start;
> + break;
> + case 0:
> + pp->cfg = win->res;
> + pp->cfg0_size = resource_size(pp->cfg)/2;
> + pp->cfg1_size = resource_size(pp->cfg)/2;
> + pp->cfg0_base = pp->cfg->start;
> + pp->cfg1_base = pp->cfg->start + pp->cfg0_size;
>
> /* Find the untranslated configuration space address */
> - pp->cfg0_mod_base = of_read_number(parser.range -
> - parser.np + na, ns);
> - pp->cfg1_mod_base = pp->cfg0_mod_base +
> - pp->cfg0_size;
> + pp->cfg0_mod_base = win->__res.start;
> + pp->cfg1_mod_base = pp->cfg0_mod_base + pp->cfg0_size;
> + break;
> + case IORESOURCE_BUS:
> + pp->busn = win->res;
> + break;
> + default:
> + continue;
> }
> }
>
> - ret = of_pci_parse_bus_range(np, &pp->busn);
> - if (ret < 0) {
> - pp->busn.name = np->name;
> - pp->busn.start = 0;
> - pp->busn.end = 0xff;
> - pp->busn.flags = IORESOURCE_BUS;
> - dev_dbg(pp->dev, "failed to parse bus-range property: %d, using default %pR\n",
> - ret, &pp->busn);
> - }
> -
> if (!pp->dbi_base) {
> - pp->dbi_base = devm_ioremap(pp->dev, pp->cfg.start,
> - resource_size(&pp->cfg));
> + pp->dbi_base = devm_ioremap(pp->dev, pp->cfg->start,
> + resource_size(pp->cfg));
> if (!pp->dbi_base) {
> dev_err(pp->dev, "error with ioremap\n");
> return -ENOMEM;
> }
> }
>
> - pp->mem_base = pp->mem.start;
> + pp->mem_base = pp->mem->start;
>
> if (!pp->va_cfg0_base) {
> pp->va_cfg0_base = devm_ioremap(pp->dev, pp->cfg0_base,
> @@ -524,15 +498,28 @@ int dw_pcie_host_init(struct pcie_port *pp)
> val |= PORT_LOGIC_SPEED_CHANGE;
> dw_pcie_wr_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, val);
>
> -#ifdef CONFIG_PCI_MSI
> - dw_pcie_msi_chip.dev = pp->dev;
Is it safe to remove the dev assignment ?
> - dw_pci.msi_ctrl = &dw_pcie_msi_chip;
> + bus = pci_create_root_bus(pp->dev, pp->root_bus_nr, &dw_pcie_ops,
> + pp, &res);
> + if (!bus)
> + return -ENOMEM;
> +
> +#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
> + bus->msi = container_of(&pp->irq_domain, struct msi_controller, domain);
> +#else
> + bus->msi = &dw_pcie_msi_chip;
> #endif
For the records, this patch conflicts with my MSI series:
http://lists.infradead.org/pipermail/linux-arm-kernel/2015-July/360461.html
Conflict resolution is easy but it is worth keeping in mind.
Thanks !
Lorenzo
>
> - dw_pci.nr_controllers = 1;
> - dw_pci.private_data = (void **)&pp;
> + pci_scan_child_bus(bus);
> + if (pp->ops->scan_bus)
> + pp->ops->scan_bus(pp);
>
> - pci_common_init_dev(pp->dev, &dw_pci);
> +#ifdef CONFIG_ARM
> + /* support old dtbs that incorrectly describe IRQs */
> + pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci);
> +#endif
> +
> + pci_assign_unassigned_bus_resources(bus);
> + pci_bus_add_devices(bus);
>
> return 0;
> }
> @@ -633,7 +620,7 @@ static int dw_pcie_valid_config(struct pcie_port *pp,
> static int dw_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
> int size, u32 *val)
> {
> - struct pcie_port *pp = sys_to_pcie(bus->sysdata);
> + struct pcie_port *pp = bus->sysdata;
> int ret;
>
> if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0) {
> @@ -657,7 +644,7 @@ static int dw_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
> static int dw_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
> int where, int size, u32 val)
> {
> - struct pcie_port *pp = sys_to_pcie(bus->sysdata);
> + struct pcie_port *pp = bus->sysdata;
> int ret;
>
> if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0)
> @@ -681,62 +668,6 @@ static struct pci_ops dw_pcie_ops = {
> .write = dw_pcie_wr_conf,
> };
>
> -static int dw_pcie_setup(int nr, struct pci_sys_data *sys)
> -{
> - struct pcie_port *pp;
> -
> - pp = sys_to_pcie(sys);
> -
> - if (global_io_offset < SZ_1M && pp->io_size > 0) {
> - sys->io_offset = global_io_offset - pp->io_bus_addr;
> - pci_ioremap_io(global_io_offset, pp->io_base);
> - global_io_offset += SZ_64K;
> - pci_add_resource_offset(&sys->resources, &pp->io,
> - sys->io_offset);
> - }
> -
> - sys->mem_offset = pp->mem.start - pp->mem_bus_addr;
> - pci_add_resource_offset(&sys->resources, &pp->mem, sys->mem_offset);
> - pci_add_resource(&sys->resources, &pp->busn);
> -
> - return 1;
> -}
> -
> -static struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys)
> -{
> - struct pci_bus *bus;
> - struct pcie_port *pp = sys_to_pcie(sys);
> -
> - pp->root_bus_nr = sys->busnr;
> - bus = pci_scan_root_bus(pp->dev, sys->busnr,
> - &dw_pcie_ops, sys, &sys->resources);
> - if (!bus)
> - return NULL;
> -
> - if (bus && pp->ops->scan_bus)
> - pp->ops->scan_bus(pp);
> -
> - return bus;
> -}
> -
> -static int dw_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
> -{
> - struct pcie_port *pp = sys_to_pcie(dev->bus->sysdata);
> - int irq;
> -
> - irq = of_irq_parse_and_map_pci(dev, slot, pin);
> - if (!irq)
> - irq = pp->irq;
> -
> - return irq;
> -}
> -
> -static struct hw_pci dw_pci = {
> - .setup = dw_pcie_setup,
> - .scan = dw_pcie_scan_bus,
> - .map_irq = dw_pcie_map_irq,
> -};
> -
> void dw_pcie_setup_rc(struct pcie_port *pp)
> {
> u32 val;
> diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-designware.h
> index d0bbd27..efac57d 100644
> --- a/drivers/pci/host/pcie-designware.h
> +++ b/drivers/pci/host/pcie-designware.h
> @@ -34,7 +34,7 @@ struct pcie_port {
> u64 cfg1_mod_base;
> void __iomem *va_cfg1_base;
> u32 cfg1_size;
> - u64 io_base;
> + resource_size_t io_base;
> u64 io_mod_base;
> phys_addr_t io_bus_addr;
> u32 io_size;
> @@ -42,10 +42,10 @@ struct pcie_port {
> u64 mem_mod_base;
> phys_addr_t mem_bus_addr;
> u32 mem_size;
> - struct resource cfg;
> - struct resource io;
> - struct resource mem;
> - struct resource busn;
> + struct resource *cfg;
> + struct resource *io;
> + struct resource *mem;
> + struct resource *busn;
> int irq;
> u32 lanes;
> struct pcie_host_ops *ops;
> diff --git a/drivers/pci/host/pcie-spear13xx.c b/drivers/pci/host/pcie-spear13xx.c
> index c49fbdc..03eb204 100644
> --- a/drivers/pci/host/pcie-spear13xx.c
> +++ b/drivers/pci/host/pcie-spear13xx.c
> @@ -286,7 +286,7 @@ static int spear13xx_add_pcie_port(struct pcie_port *pp,
> return ret;
> }
>
> - pp->root_bus_nr = -1;
> + pp->root_bus_nr = 0;
> pp->ops = &spear13xx_pcie_host_ops;
>
> ret = dw_pcie_host_init(pp);
> --
> 1.9.1
>
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