[PATCH v2 2/4] PCI: designware: Add ARM64 support
Zhou Wang
wangzhou1 at hisilicon.com
Wed Jun 10 22:44:18 PDT 2015
On 2015/6/10 21:35, Gabriele Paoloni wrote:
> Hi Zhou Wang and all
>
> I have worked on a patch that unify ARM and ARM64. As you can see I have removed the parser and now I use "of_pci_get_host_bridge_resources" in order to retrieve the resources associated to each pci host bridge window.
> The resources now are not copied to the designware pcie_port pp, instead they are passed by pointer.
>
> This patch is intended to replace entirely "[PATCH v2 2/4]"; so I have also included all the changes about the other drivers
>
> Please find the patch inline below.
>
> Let me know if you think it is ok.
>
> Regards
>
> Gab
>
> ------------------------------------
> ------------------------------------
>
> This patch is a rework of
> "[PATCH v2 2/4] PCI: designware: Add ARM64 support" from Zhou Wang.
>
> The intention is to complete the unification between ARM and
> ARM64 now that the dependency on arch/arm/kernel/bios32.c is gone.
>
> I have also included the rework asked by James Morse:
> io_base declared as resource_size_t
>
> It compiles fine on ARCH arm and arm64.
Hi Gabriele,
I manually apply this patch on my series, as there are some format errors
about this patch. And I think this patch is a experimental one, it could not
be compiled successfully.
>
> It needs to be tested.
>
> Signed-off-by: Gabriele Paoloni <gabriele.paoloni at huawei.com>
>
> [...]
>
> -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;
> + LIST_HEAD(res);
> u32 val, na, ns;
> const __be32 *addrp;
> int i, index, ret;
> + int rlen;
> + struct pci_host_bridge_window *win;
This struct is not in latest kernel, I think you should use struct resource_entry.
Thanks,
Zhou
> + const __be32 *parser_range_end = of_get_property(np, "ranges", &rlen);
> +
> + if (parser_range_end == NULL)
> + return -ENOENT;
> + parser_range_end += rlen/sizeof(__be32);
> +
>
> /* Find the address cell size and the number of cells in order to get
> * the untranslated address.
> @@ -375,78 +375,67 @@ 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;
> + list_for_each_entry(win, &res, list) {
> + 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;
> + /* magic 5 below comes from magic na and ns in
> + * of_pci_range_parser_init() */
> + pp->io_mod_base = of_read_number(parser_range_end -
> + of_n_addr_cells(np) - 5 + na, ns);
> + 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 = of_read_number(parser_range_end -
> + of_n_addr_cells(np) - 5 + na, ns);
> + 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 = of_read_number(parser_range_end -
> + of_n_addr_cells(np) - 5 + na, ns);
> + 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, @@ -493,24 +482,47 @@ int dw_pcie_host_init(struct pcie_port *pp)
> if (pp->ops->host_init)
> pp->ops->host_init(pp);
>
> - dw_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0);
> + if (dw_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0)
> + != PCIBIOS_SUCCESSFUL)
> + return -EINVAL;
>
> /* program correct class for RC */
> - dw_pcie_wr_own_conf(pp, PCI_CLASS_DEVICE, 2, PCI_CLASS_BRIDGE_PCI);
> + if (dw_pcie_wr_own_conf(pp, PCI_CLASS_DEVICE, 2, PCI_CLASS_BRIDGE_PCI)
> + != PCIBIOS_SUCCESSFUL)
> + return -EINVAL;
> +
> + if (dw_pcie_rd_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, &val)
> + != PCIBIOS_SUCCESSFUL)
> + return -EINVAL;
>
> - dw_pcie_rd_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, &val);
> 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;
> - dw_pci.msi_ctrl = &dw_pcie_msi_chip;
> + if (dw_pcie_wr_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, val)
> + != PCIBIOS_SUCCESSFUL)
> + return -EINVAL;
> +
> + 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
>
> - 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;
> }
> @@ -653,7 +665,7 @@ 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) { @@ -677,7 +689,7 @@ 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) @@ -701,64 +713,6 @@ 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_create_root_bus(pp->dev, sys->busnr,
> - &dw_pcie_ops, sys, &sys->resources);
> - if (!bus)
> - return NULL;
> -
> - pci_scan_child_bus(bus);
> -
> - 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..ab78710 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 020d788..e78ddf8 100644
> --- a/drivers/pci/host/pcie-spear13xx.c
> +++ b/drivers/pci/host/pcie-spear13xx.c
> @@ -287,7 +287,7 @@ 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);
> ------------------------------------
> ------------------------------------
>
>
>
>
>> -----Original Message-----
>> From: Lorenzo Pieralisi [mailto:lorenzo.pieralisi at arm.com]
>> Sent: Tuesday, June 09, 2015 12:15 PM
>> To: Wangzhou (B)
>> Cc: James Morse; Bjorn Helgaas; Jingoo Han; Pratyush Anand; Arnd
>> Bergmann; fabrice.gasnier at st.com; Liviu Dudau; linux-
>> pci at vger.kernel.org; linux-arm-kernel at lists.infradead.org;
>> devicetree at vger.kernel.org; Gabriele Paoloni; Yuanzhichang; Zhudacai;
>> zhangjukuo; qiuzhenfa; Liguozhu (Kenneth)
>> Subject: Re: [PATCH v2 2/4] PCI: designware: Add ARM64 support
>>
>> On Fri, Jun 05, 2015 at 09:11:30AM +0100, Zhou Wang wrote:
>>
>> [...]
>>
>>>>> -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;
>>>>> + LIST_HEAD(res);
>>>>> u32 val, na, ns;
>>>>> const __be32 *addrp;
>>>>> int i, index, ret;
>>>>> @@ -502,15 +498,49 @@ 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;
>>>>> - dw_pci.msi_ctrl = &dw_pcie_msi_chip;
>>>>> +#ifdef CONFIG_ARM
>>>>> + /*
>>>>> + * FIXME: we should really be able to use
>>>>> + * of_pci_get_host_bridge_resources on arm32 as well,
>>>>> + * but the conversion needs some more testing
>>>>> + */
>>>>> + if (global_io_offset < SZ_1M && pp->io_size > 0) {
>>>>> + pci_ioremap_io(global_io_offset, pp->io_base);
>>>>> + global_io_offset += SZ_64K;
>>>>> + pci_add_resource_offset(&res, &pp->io,
>>>>> + global_io_offset - pp->io_bus_addr);
>>>>> + }
>>>>> + pci_add_resource_offset(&res, &pp->mem,
>>>>> + pp->mem.start - pp->mem_bus_addr);
>>>>> + pci_add_resource(&res, &pp->busn);
>>>>
>>>> I don't think this #ifdef is necessary. In the spirit of 'the
>>>> conversion needs some more testing', I removed it leaving just the
>> below arm64 code.
>>>>
>>>> This worked on my Freescale i.MX6 Quad SABRE Lite Board, I went as
>>>> far as scanning for wireless access points.
>>>>
>>>
>>> I think it depends on which kind of PCIe device you use, if we use a
>>> PCIe device with a I/O Bar, it may not work well without above code.
>>> But so far, I have not met a PCIe device which must work with a I/O
>> Bar.
>>
>> There are two problems here:
>>
>> 1) the io_base address you get from of_pci_get_host_bridge_resources
>> must be mapped using pci_remap_iospace. You are not doing this, so
>> even if you had a PCIe card with I/O bar it would not work on arm64
>> as the code stands. Remember that I/O space on arm/arm64 works as a
>> memory access with offset from PCI_IOBASE and that's the value you
>> get
>> in the I/O resource. See:
>>
>> drivers/pci/host/pci-host-generic.c
>> drivers/pci/host/pci-versatile.c
>> drivers/pci/host/pci-xgene.c
>>
>> 2) (1) above would sort out I/O space access for both arm and arm64 so,
>> as James said, the #ifdef is useless.
>>
>> I hope this makes things clearer.
>>
>> Thanks,
>> Lorenzo
>>
>>>
>>>>> +#else
>>>>> + ret = of_pci_get_host_bridge_resources(np, 0, 0xff, &res,
>>>>> +&pp->io_base);
>>>>
>>>> of_pci_get_host_bridge_resources expects &pp->io_base to be a
>>>> resource_size_t*, but &io_base is u64*. This generates a warning on
>>>> arm with the above change. Changing the the type in
>>>> drivers/pci/host/pcie-designware.h fixes this.
>>>>
>>>>
>>>> Thanks,
>>>>
>>>> James
>>>>
>>>
>>> OK, will modify this in next version.
>>>
>>> Best Regards and thanks again for your test, Zhou
>>>
>>>>> + if (ret)
>>>>> + return ret;
>>>>> +#endif
>>>>> +
>>>>> + 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
>>>>>
>>>>> - 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;
>>>>> }
>>>>> @@ -653,7 +683,7 @@ 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)
>> { @@
>>>>> -677,7 +707,7 @@ 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) @@
>>>>> -701,64 +731,6 @@ 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_create_root_bus(pp->dev, sys->busnr,
>>>>> - &dw_pcie_ops, sys, &sys->resources);
>>>>> - if (!bus)
>>>>> - return NULL;
>>>>> -
>>>>> - pci_scan_child_bus(bus);
>>>>> -
>>>>> - 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;
>>>>
>>>>
>>>> .
>>>>
>>>
>>>
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