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

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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.

It needs to be tested.

Signed-off-by: Gabriele Paoloni <gabriele.paoloni@xxxxxxxxxx>


---
 drivers/pci/host/pci-dra7xx.c      |   1 +
 drivers/pci/host/pci-exynos.c      |   2 +-
 drivers/pci/host/pci-imx6.c        |   2 +-
 drivers/pci/host/pci-keystone.c    |   2 +-
 drivers/pci/host/pci-layerscape.c  |   2 +-
 drivers/pci/host/pcie-designware.c | 242 +++++++++++++++----------------------
 drivers/pci/host/pcie-designware.h |  10 +-
 drivers/pci/host/pcie-spear13xx.c  |   2 +-
 8 files changed, 109 insertions(+), 154 deletions(-)

diff --git a/drivers/pci/host/pci-dra7xx.c b/drivers/pci/host/pci-dra7xx.c index 2d57e19..5c8b6ab 100644
--- a/drivers/pci/host/pci-dra7xx.c
+++ b/drivers/pci/host/pci-dra7xx.c
@@ -280,6 +280,7 @@ 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 c139237..4b6db6c 100644
--- a/drivers/pci/host/pci-exynos.c
+++ b/drivers/pci/host/pci-exynos.c
@@ -534,7 +534,7 @@ 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 fdb9536..c4a80c5 100644
--- a/drivers/pci/host/pci-imx6.c
+++ b/drivers/pci/host/pci-imx6.c
@@ -541,7 +541,7 @@ 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.c b/drivers/pci/host/pci-keystone.c index 75333b0..df91f5e 100644
--- a/drivers/pci/host/pci-keystone.c
+++ b/drivers/pci/host/pci-keystone.c
@@ -312,7 +312,7 @@ 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 4a6e62f..5c7a9c4 100644
--- a/drivers/pci/host/pci-layerscape.c
+++ b/drivers/pci/host/pci-layerscape.c
@@ -101,7 +101,7 @@ 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 2e9f84f..31b29a5 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>
@@ -67,16 +68,7 @@
 #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)  { @@ -238,7 +230,7 @@ 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));
@@ -281,7 +273,7 @@ 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;
@@ -310,7 +302,7 @@ 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);  } @@ -342,16 +334,24 @@ static const struct irq_domain_ops msi_domain_ops = {
 	.map = dw_pcie_msi_map,
 };
 
-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;
+	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@xxxxxxx]
> Sent: Tuesday, June 09, 2015 12:15 PM
> To: Wangzhou (B)
> Cc: James Morse; Bjorn Helgaas; Jingoo Han; Pratyush Anand; Arnd
> Bergmann; fabrice.gasnier@xxxxxx; Liviu Dudau; linux-
> pci@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
> devicetree@xxxxxxxxxxxxxxx; 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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> > in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo
> > info at  http://vger.kernel.org/majordomo-info.html
> >
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