[PATCH v7 3/6] PCI: designware: Add ARM64 support
Zhou Wang
wangzhou1 at hisilicon.com
Wed Aug 19 05:20:51 PDT 2015
Hi Pratyush and Jingoo,
what is your opinion about this patch? It will be very appreciated if you
could take a look at it.
Thanks,
Zhou
On 2015/8/17 19:55, 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.
>
> In past, we use:
> pci_common_init_dev
> -> pcibios_init_hw
> -> hw->scan (dw_pcie_scan_bus)
> to pass 0 to root_bus_nr in struct pcie_port. This patch set pp->root_bus_nr = 0
> in each PCIe host driver which is based on pcie-designware.
>
> This patch also try to use of_pci_get_host_bridge_resources for ARM32 and ARM64
> according to the suggestion for Gabriele[1]
>
> Finally this patch reverts commit f4c55c5a3f7f "PCI: designware: Program ATU
> with untranslated address" based on 1/6 in this series. we delete *_mod_base in
> pcie-designware. This was discussed in [2]
>
> I have compiled the driver with multi_v7_defconfig. However, I don't have
> ARM32 PCIe related board to do test. It will be appreciated if someone could
> help to test it.
>
> Signed-off-by: Zhou Wang <wangzhou1 at hisilicon.com>
> Signed-off-by: Gabriele Paoloni <gabriele.paoloni at huawei.com>
> Signed-off-by: Arnd Bergmann <arnd at arndb.de>
> Tested-By: James Morse <james.morse at arm.com>
>
> [1] http://www.spinics.net/lists/linux-pci/msg42194.html
> [2] http://www.spinics.net/lists/arm-kernel/msg436779.html
> ---
> drivers/pci/host/pci-dra7xx.c | 15 +--
> drivers/pci/host/pci-exynos.c | 2 +-
> drivers/pci/host/pci-imx6.c | 2 +-
> drivers/pci/host/pci-keystone-dw.c | 2 +-
> drivers/pci/host/pci-keystone.c | 2 +-
> drivers/pci/host/pci-layerscape.c | 2 +-
> drivers/pci/host/pcie-designware.c | 229 ++++++++++++-------------------------
> drivers/pci/host/pcie-designware.h | 14 +--
> drivers/pci/host/pcie-spear13xx.c | 2 +-
> 9 files changed, 95 insertions(+), 175 deletions(-)
>
> diff --git a/drivers/pci/host/pci-dra7xx.c b/drivers/pci/host/pci-dra7xx.c
> index 18ae7ff..1268c69 100644
> --- a/drivers/pci/host/pci-dra7xx.c
> +++ b/drivers/pci/host/pci-dra7xx.c
> @@ -141,15 +141,15 @@ static void dra7xx_pcie_host_init(struct pcie_port *pp)
> {
> dw_pcie_setup_rc(pp);
>
> - if (pp->io_mod_base)
> - pp->io_mod_base &= CPU_TO_BUS_ADDR;
> + if (pp->io_base)
> + pp->io_base &= CPU_TO_BUS_ADDR;
>
> - if (pp->mem_mod_base)
> - pp->mem_mod_base &= CPU_TO_BUS_ADDR;
> + if (pp->mem_base)
> + pp->mem_base &= CPU_TO_BUS_ADDR;
>
> - if (pp->cfg0_mod_base) {
> - pp->cfg0_mod_base &= CPU_TO_BUS_ADDR;
> - pp->cfg1_mod_base &= CPU_TO_BUS_ADDR;
> + if (pp->cfg0_base) {
> + pp->cfg0_base &= CPU_TO_BUS_ADDR;
> + pp->cfg1_base &= CPU_TO_BUS_ADDR;
> }
>
> dra7xx_pcie_establish_link(pp);
> @@ -288,6 +288,7 @@ static int __init dra7xx_add_pcie_port(struct dra7xx_pcie *dra7xx,
>
> pp = &dra7xx->pp;
> pp->dev = dev;
> + pp->root_bus_nr = 0;
> pp->ops = &dra7xx_pcie_host_ops;
>
> pp->irq = platform_get_irq(pdev, 1);
> diff --git a/drivers/pci/host/pci-exynos.c b/drivers/pci/host/pci-exynos.c
> index f9f468d..9771bb0 100644
> --- a/drivers/pci/host/pci-exynos.c
> +++ b/drivers/pci/host/pci-exynos.c
> @@ -530,7 +530,7 @@ static int __init exynos_add_pcie_port(struct pcie_port *pp,
> }
> }
>
> - pp->root_bus_nr = -1;
> + pp->root_bus_nr = 0;
> pp->ops = &exynos_pcie_host_ops;
>
> ret = dw_pcie_host_init(pp);
> diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
> index 233a196..bec256c 100644
> --- a/drivers/pci/host/pci-imx6.c
> +++ b/drivers/pci/host/pci-imx6.c
> @@ -551,7 +551,7 @@ static int __init imx6_add_pcie_port(struct pcie_port *pp,
> }
> }
>
> - pp->root_bus_nr = -1;
> + pp->root_bus_nr = 0;
> pp->ops = &imx6_pcie_host_ops;
>
> ret = dw_pcie_host_init(pp);
> diff --git a/drivers/pci/host/pci-keystone-dw.c b/drivers/pci/host/pci-keystone-dw.c
> index f34892e..b1e4135 100644
> --- a/drivers/pci/host/pci-keystone-dw.c
> +++ b/drivers/pci/host/pci-keystone-dw.c
> @@ -327,7 +327,7 @@ static void ks_dw_pcie_clear_dbi_mode(void __iomem *reg_virt)
> void ks_dw_pcie_setup_rc_app_regs(struct keystone_pcie *ks_pcie)
> {
> struct pcie_port *pp = &ks_pcie->pp;
> - u32 start = pp->mem.start, end = pp->mem.end;
> + u32 start = pp->mem->start, end = pp->mem->end;
> int i, tr_size;
>
> /* Disable BARs for inbound access */
> diff --git a/drivers/pci/host/pci-keystone.c b/drivers/pci/host/pci-keystone.c
> index 734da58..8113832 100644
> --- a/drivers/pci/host/pci-keystone.c
> +++ b/drivers/pci/host/pci-keystone.c
> @@ -309,7 +309,7 @@ static int __init ks_add_pcie_port(struct keystone_pcie *ks_pcie,
> return ret;
> }
>
> - pp->root_bus_nr = -1;
> + pp->root_bus_nr = 0;
> pp->ops = &keystone_pcie_host_ops;
> ret = ks_dw_pcie_host_init(ks_pcie, ks_pcie->msi_intc_np);
> if (ret) {
> diff --git a/drivers/pci/host/pci-layerscape.c b/drivers/pci/host/pci-layerscape.c
> index b2328ea1..79ff08c 100644
> --- a/drivers/pci/host/pci-layerscape.c
> +++ b/drivers/pci/host/pci-layerscape.c
> @@ -106,7 +106,7 @@ static int ls_add_pcie_port(struct ls_pcie *pcie)
> pp = &pcie->pp;
> pp->dev = pcie->dev;
> pp->dbi_base = pcie->dbi;
> - pp->root_bus_nr = -1;
> + pp->root_bus_nr = 0;
> pp->ops = &ls_pcie_host_ops;
>
> ret = dw_pcie_host_init(pp);
> diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
> index c5d407c..e71a88e 100644
> --- a/drivers/pci/host/pcie-designware.c
> +++ b/drivers/pci/host/pcie-designware.c
> @@ -11,6 +11,7 @@
> * published by the Free Software Foundation.
> */
>
> +#include <linux/hardirq.h>
> #include <linux/irq.h>
> #include <linux/irqdomain.h>
> #include <linux/kernel.h>
> @@ -69,16 +70,7 @@
> #define PCIE_ATU_FUNC(x) (((x) & 0x7) << 16)
> #define PCIE_ATU_UPPER_TARGET 0x91C
>
> -static struct hw_pci dw_pci;
> -
> -static unsigned long global_io_offset;
> -
> -static inline struct pcie_port *sys_to_pcie(struct pci_sys_data *sys)
> -{
> - BUG_ON(!sys->private_data);
> -
> - return sys->private_data;
> -}
> +static struct pci_ops dw_pcie_ops;
>
> int dw_pcie_cfg_read(void __iomem *addr, int where, int size, u32 *val)
> {
> @@ -255,7 +247,7 @@ static void dw_pcie_msi_set_irq(struct pcie_port *pp, int irq)
> static int assign_irq(int no_irqs, struct msi_desc *desc, int *pos)
> {
> int irq, pos0, i;
> - struct pcie_port *pp = sys_to_pcie(desc->dev->bus->sysdata);
> + struct pcie_port *pp = desc->dev->bus->sysdata;
>
> pos0 = bitmap_find_free_region(pp->msi_irq_in_use, MAX_MSI_IRQS,
> order_base_2(no_irqs));
> @@ -298,7 +290,7 @@ static int dw_msi_setup_irq(struct msi_controller *chip, struct pci_dev *pdev,
> {
> int irq, pos;
> struct msi_msg msg;
> - struct pcie_port *pp = sys_to_pcie(pdev->bus->sysdata);
> + struct pcie_port *pp = pdev->bus->sysdata;
>
> if (desc->msi_attrib.is_msix)
> return -EINVAL;
> @@ -327,7 +319,7 @@ static void dw_msi_teardown_irq(struct msi_controller *chip, unsigned int irq)
> {
> struct irq_data *data = irq_get_irq_data(irq);
> struct msi_desc *msi = irq_data_get_msi(data);
> - struct pcie_port *pp = sys_to_pcie(msi->dev->bus->sysdata);
> + struct pcie_port *pp = msi->dev->bus->sysdata;
>
> clear_irq_range(pp, irq, 1, data->hwirq);
> }
> @@ -363,14 +355,12 @@ int 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, ns;
> - const __be32 *addrp;
> - int i, index, ret;
> -
> - ns = of_n_size_cells(np);
> + LIST_HEAD(res);
> + u32 val;
> + int i, ret;
> + struct resource_entry *win;
>
> cfg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config");
> if (cfg_res) {
> @@ -378,85 +368,60 @@ int dw_pcie_host_init(struct pcie_port *pp)
> pp->cfg1_size = resource_size(cfg_res)/2;
> pp->cfg0_base = cfg_res->start;
> pp->cfg1_base = cfg_res->start + pp->cfg0_size;
> -
> - /* Find the untranslated configuration space address */
> - index = of_property_match_string(np, "reg-names", "config");
> - addrp = of_get_address(np, index, NULL, NULL);
> - pp->cfg0_mod_base = of_read_number(addrp, ns);
> - pp->cfg1_mod_base = pp->cfg0_mod_base + pp->cfg0_size;
> } else {
> 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 = range.cpu_addr;
> - }
> - 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 = range.cpu_addr;
> - }
> - 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;
> -
> - /* Find the untranslated configuration space address */
> - pp->cfg0_mod_base = range.cpu_addr;
> - pp->cfg1_mod_base = pp->cfg0_mod_base +
> - 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;
> + 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;
> + 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;
> + 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,
> @@ -505,7 +470,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
>
> if (!pp->ops->rd_other_conf)
> dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX1,
> - PCIE_ATU_TYPE_MEM, pp->mem_mod_base,
> + PCIE_ATU_TYPE_MEM, pp->mem_base,
> pp->mem_bus_addr, pp->mem_size);
>
> dw_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0);
> @@ -517,15 +482,29 @@ 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
> + 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
> dw_pcie_msi_chip.dev = pp->dev;
> - dw_pci.msi_ctrl = &dw_pcie_msi_chip;
> + 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);
> +
> +#ifdef CONFIG_ARM
> + /* support old dtbs that incorrectly describe IRQs */
> + pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci);
> +#endif
>
> - pci_common_init_dev(pp->dev, &dw_pci);
> + pci_assign_unassigned_bus_resources(bus);
> + pci_bus_add_devices(bus);
>
> return 0;
> }
> @@ -544,12 +523,12 @@ static int dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
>
> if (bus->parent->number == pp->root_bus_nr) {
> type = PCIE_ATU_TYPE_CFG0;
> - cpu_addr = pp->cfg0_mod_base;
> + cpu_addr = pp->cfg0_base;
> cfg_size = pp->cfg0_size;
> va_cfg_base = pp->va_cfg0_base;
> } else {
> type = PCIE_ATU_TYPE_CFG1;
> - cpu_addr = pp->cfg1_mod_base;
> + cpu_addr = pp->cfg1_base;
> cfg_size = pp->cfg1_size;
> va_cfg_base = pp->va_cfg1_base;
> }
> @@ -559,7 +538,7 @@ static int dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
> busdev, cfg_size);
> ret = dw_pcie_cfg_read(va_cfg_base + address, where, size, val);
> dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX0,
> - PCIE_ATU_TYPE_IO, pp->io_mod_base,
> + PCIE_ATU_TYPE_IO, pp->io_base,
> pp->io_bus_addr, pp->io_size);
>
> return ret;
> @@ -579,12 +558,12 @@ static int dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
>
> if (bus->parent->number == pp->root_bus_nr) {
> type = PCIE_ATU_TYPE_CFG0;
> - cpu_addr = pp->cfg0_mod_base;
> + cpu_addr = pp->cfg0_base;
> cfg_size = pp->cfg0_size;
> va_cfg_base = pp->va_cfg0_base;
> } else {
> type = PCIE_ATU_TYPE_CFG1;
> - cpu_addr = pp->cfg1_mod_base;
> + cpu_addr = pp->cfg1_base;
> cfg_size = pp->cfg1_size;
> va_cfg_base = pp->va_cfg1_base;
> }
> @@ -594,7 +573,7 @@ static int dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
> busdev, cfg_size);
> ret = dw_pcie_cfg_write(va_cfg_base + address, where, size, val);
> dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX0,
> - PCIE_ATU_TYPE_IO, pp->io_mod_base,
> + PCIE_ATU_TYPE_IO, pp->io_base,
> pp->io_bus_addr, pp->io_size);
>
> return ret;
> @@ -626,7 +605,7 @@ 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) {
> @@ -650,7 +629,7 @@ 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)
> @@ -674,62 +653,6 @@ 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..264c969 100644
> --- a/drivers/pci/host/pcie-designware.h
> +++ b/drivers/pci/host/pcie-designware.h
> @@ -27,25 +27,21 @@ struct pcie_port {
> u8 root_bus_nr;
> void __iomem *dbi_base;
> u64 cfg0_base;
> - u64 cfg0_mod_base;
> void __iomem *va_cfg0_base;
> u32 cfg0_size;
> u64 cfg1_base;
> - u64 cfg1_mod_base;
> void __iomem *va_cfg1_base;
> u32 cfg1_size;
> - u64 io_base;
> - u64 io_mod_base;
> + resource_size_t io_base;
> phys_addr_t io_bus_addr;
> u32 io_size;
> u64 mem_base;
> - 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);
>
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