Subject: [PATCH v2 2/4] PCI: designware: Add ARM64 support

From: [email-masked] (Zhou Wang)
Date: Thu, 11 Jun 2015 13:44:18 +0800

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 <[email-masked]>
> 
> [...]
>
> -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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>>>
> 
> .
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