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Date: Mon, 15 Apr 2013 17:32:59 +0200
From: Benjamin Herrenschmidt <benh@...nel.crashing.org>
To: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Cc: monstr@...str.eu, Andrew Murray <Andrew.Murray@....com>,
rob.herring@...xeda.com, jgunthorpe@...idianresearch.com,
linux@....linux.org.uk, siva.kallam@...sung.com,
linux-pci@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
jg1.han@...sung.com, Liviu.Dudau@....com,
linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
kgene.kim@...sung.com, bhelgaas@...gle.com,
suren.reddy@...sung.com, linux-arm-kernel@...ts.infradead.org,
paulus@...ba.org, grant.likely@...retlab.ca,
thierry.reding@...onic-design.de, thomas.abraham@...aro.org,
arnd@...db.de, linus.walleij@...aro.org
Subject: Re: [PATCH v6 1/3] of/pci: Unify pci_process_bridge_OF_ranges from
Microblaze and PowerPC
On Mon, 2013-04-15 at 14:57 +0200, Thomas Petazzoni wrote:
> Michal, Ben,
>
> Would you have some time to look at this patch and give your comments
> and/or ACK ? Since it touches the PowerPC and Microblaze core code, we
> need your agreement to merge this code, and quite a bit of code pending
> for 3.10 depends on this patch.
I'm currently still on vacation. I will be able to look at this after
I'm back in about a week.
> Rob, alternatively, could we imagine doing a different version of the
> 'of/pci: Provide support for parsing PCI DT ranges property' that
> introduces the new API only, leaving the PowerPC and Microblaze rework
> as follow-up efforts, so that all the PCIe drivers that depend on this
> patch can get in for 3.10 ? I'd find it pretty sad if the Marvell PCIe
> driver that has been worked on since 4+ months does not get into 3.10
> just because this patch cannot be merged.
Cheers,
Ben.
> Thanks!
>
> Thomas
>
> On Thu, 11 Apr 2013 16:26:07 +0100, Andrew Murray wrote:
> > The pci_process_bridge_OF_ranges function, used to parse the "ranges"
> > property of a PCI host device, is found in both Microblaze and PowerPC
> > architectures. These implementations are nearly identical. This patch
> > moves this common code to a common place.
> >
> > Signed-off-by: Andrew Murray <Andrew.Murray@....com>
> > Signed-off-by: Liviu Dudau <Liviu.Dudau@....com>
> > Reviewed-by: Rob Herring <rob.herring@...xeda.com>
> > Tested-by: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
> > ---
> > arch/microblaze/include/asm/pci-bridge.h | 5 +-
> > arch/microblaze/pci/pci-common.c | 192 ----------------------------
> > arch/powerpc/include/asm/pci-bridge.h | 5 +-
> > arch/powerpc/kernel/pci-common.c | 192 ----------------------------
> > drivers/of/of_pci.c | 200 ++++++++++++++++++++++++++++++
> > include/linux/of_pci.h | 4 +
> > 6 files changed, 206 insertions(+), 392 deletions(-)
> >
> > diff --git a/arch/microblaze/include/asm/pci-bridge.h b/arch/microblaze/include/asm/pci-bridge.h
> > index cb5d397..5783cd6 100644
> > --- a/arch/microblaze/include/asm/pci-bridge.h
> > +++ b/arch/microblaze/include/asm/pci-bridge.h
> > @@ -10,6 +10,7 @@
> > #include <linux/pci.h>
> > #include <linux/list.h>
> > #include <linux/ioport.h>
> > +#include <linux/of_pci.h>
> >
> > struct device_node;
> >
> > @@ -132,10 +133,6 @@ extern void setup_indirect_pci(struct pci_controller *hose,
> > extern struct pci_controller *pci_find_hose_for_OF_device(
> > struct device_node *node);
> >
> > -/* Fill up host controller resources from the OF node */
> > -extern void pci_process_bridge_OF_ranges(struct pci_controller *hose,
> > - struct device_node *dev, int primary);
> > -
> > /* Allocate & free a PCI host bridge structure */
> > extern struct pci_controller *pcibios_alloc_controller(struct device_node *dev);
> > extern void pcibios_free_controller(struct pci_controller *phb);
> > diff --git a/arch/microblaze/pci/pci-common.c b/arch/microblaze/pci/pci-common.c
> > index 9ea521e..2735ad9 100644
> > --- a/arch/microblaze/pci/pci-common.c
> > +++ b/arch/microblaze/pci/pci-common.c
> > @@ -622,198 +622,6 @@ void pci_resource_to_user(const struct pci_dev *dev, int bar,
> > *end = rsrc->end - offset;
> > }
> >
> > -/**
> > - * pci_process_bridge_OF_ranges - Parse PCI bridge resources from device tree
> > - * @hose: newly allocated pci_controller to be setup
> > - * @dev: device node of the host bridge
> > - * @primary: set if primary bus (32 bits only, soon to be deprecated)
> > - *
> > - * This function will parse the "ranges" property of a PCI host bridge device
> > - * node and setup the resource mapping of a pci controller based on its
> > - * content.
> > - *
> > - * Life would be boring if it wasn't for a few issues that we have to deal
> > - * with here:
> > - *
> > - * - We can only cope with one IO space range and up to 3 Memory space
> > - * ranges. However, some machines (thanks Apple !) tend to split their
> > - * space into lots of small contiguous ranges. So we have to coalesce.
> > - *
> > - * - We can only cope with all memory ranges having the same offset
> > - * between CPU addresses and PCI addresses. Unfortunately, some bridges
> > - * are setup for a large 1:1 mapping along with a small "window" which
> > - * maps PCI address 0 to some arbitrary high address of the CPU space in
> > - * order to give access to the ISA memory hole.
> > - * The way out of here that I've chosen for now is to always set the
> > - * offset based on the first resource found, then override it if we
> > - * have a different offset and the previous was set by an ISA hole.
> > - *
> > - * - Some busses have IO space not starting at 0, which causes trouble with
> > - * the way we do our IO resource renumbering. The code somewhat deals with
> > - * it for 64 bits but I would expect problems on 32 bits.
> > - *
> > - * - Some 32 bits platforms such as 4xx can have physical space larger than
> > - * 32 bits so we need to use 64 bits values for the parsing
> > - */
> > -void pci_process_bridge_OF_ranges(struct pci_controller *hose,
> > - struct device_node *dev, int primary)
> > -{
> > - const u32 *ranges;
> > - int rlen;
> > - int pna = of_n_addr_cells(dev);
> > - int np = pna + 5;
> > - int memno = 0, isa_hole = -1;
> > - u32 pci_space;
> > - unsigned long long pci_addr, cpu_addr, pci_next, cpu_next, size;
> > - unsigned long long isa_mb = 0;
> > - struct resource *res;
> > -
> > - pr_info("PCI host bridge %s %s ranges:\n",
> > - dev->full_name, primary ? "(primary)" : "");
> > -
> > - /* Get ranges property */
> > - ranges = of_get_property(dev, "ranges", &rlen);
> > - if (ranges == NULL)
> > - return;
> > -
> > - /* Parse it */
> > - pr_debug("Parsing ranges property...\n");
> > - while ((rlen -= np * 4) >= 0) {
> > - /* Read next ranges element */
> > - pci_space = ranges[0];
> > - pci_addr = of_read_number(ranges + 1, 2);
> > - cpu_addr = of_translate_address(dev, ranges + 3);
> > - size = of_read_number(ranges + pna + 3, 2);
> > -
> > - pr_debug("pci_space: 0x%08x pci_addr:0x%016llx ",
> > - pci_space, pci_addr);
> > - pr_debug("cpu_addr:0x%016llx size:0x%016llx\n",
> > - cpu_addr, size);
> > -
> > - ranges += np;
> > -
> > - /* If we failed translation or got a zero-sized region
> > - * (some FW try to feed us with non sensical zero sized regions
> > - * such as power3 which look like some kind of attempt
> > - * at exposing the VGA memory hole)
> > - */
> > - if (cpu_addr == OF_BAD_ADDR || size == 0)
> > - continue;
> > -
> > - /* Now consume following elements while they are contiguous */
> > - for (; rlen >= np * sizeof(u32);
> > - ranges += np, rlen -= np * 4) {
> > - if (ranges[0] != pci_space)
> > - break;
> > - pci_next = of_read_number(ranges + 1, 2);
> > - cpu_next = of_translate_address(dev, ranges + 3);
> > - if (pci_next != pci_addr + size ||
> > - cpu_next != cpu_addr + size)
> > - break;
> > - size += of_read_number(ranges + pna + 3, 2);
> > - }
> > -
> > - /* Act based on address space type */
> > - res = NULL;
> > - switch ((pci_space >> 24) & 0x3) {
> > - case 1: /* PCI IO space */
> > - pr_info(" IO 0x%016llx..0x%016llx -> 0x%016llx\n",
> > - cpu_addr, cpu_addr + size - 1, pci_addr);
> > -
> > - /* We support only one IO range */
> > - if (hose->pci_io_size) {
> > - pr_info(" \\--> Skipped (too many) !\n");
> > - continue;
> > - }
> > - /* On 32 bits, limit I/O space to 16MB */
> > - if (size > 0x01000000)
> > - size = 0x01000000;
> > -
> > - /* 32 bits needs to map IOs here */
> > - hose->io_base_virt = ioremap(cpu_addr, size);
> > -
> > - /* Expect trouble if pci_addr is not 0 */
> > - if (primary)
> > - isa_io_base =
> > - (unsigned long)hose->io_base_virt;
> > - /* pci_io_size and io_base_phys always represent IO
> > - * space starting at 0 so we factor in pci_addr
> > - */
> > - hose->pci_io_size = pci_addr + size;
> > - hose->io_base_phys = cpu_addr - pci_addr;
> > -
> > - /* Build resource */
> > - res = &hose->io_resource;
> > - res->flags = IORESOURCE_IO;
> > - res->start = pci_addr;
> > - break;
> > - case 2: /* PCI Memory space */
> > - case 3: /* PCI 64 bits Memory space */
> > - pr_info(" MEM 0x%016llx..0x%016llx -> 0x%016llx %s\n",
> > - cpu_addr, cpu_addr + size - 1, pci_addr,
> > - (pci_space & 0x40000000) ? "Prefetch" : "");
> > -
> > - /* We support only 3 memory ranges */
> > - if (memno >= 3) {
> > - pr_info(" \\--> Skipped (too many) !\n");
> > - continue;
> > - }
> > - /* Handles ISA memory hole space here */
> > - if (pci_addr == 0) {
> > - isa_mb = cpu_addr;
> > - isa_hole = memno;
> > - if (primary || isa_mem_base == 0)
> > - isa_mem_base = cpu_addr;
> > - hose->isa_mem_phys = cpu_addr;
> > - hose->isa_mem_size = size;
> > - }
> > -
> > - /* We get the PCI/Mem offset from the first range or
> > - * the, current one if the offset came from an ISA
> > - * hole. If they don't match, bugger.
> > - */
> > - if (memno == 0 ||
> > - (isa_hole >= 0 && pci_addr != 0 &&
> > - hose->pci_mem_offset == isa_mb))
> > - hose->pci_mem_offset = cpu_addr - pci_addr;
> > - else if (pci_addr != 0 &&
> > - hose->pci_mem_offset != cpu_addr - pci_addr) {
> > - pr_info(" \\--> Skipped (offset mismatch) !\n");
> > - continue;
> > - }
> > -
> > - /* Build resource */
> > - res = &hose->mem_resources[memno++];
> > - res->flags = IORESOURCE_MEM;
> > - if (pci_space & 0x40000000)
> > - res->flags |= IORESOURCE_PREFETCH;
> > - res->start = cpu_addr;
> > - break;
> > - }
> > - if (res != NULL) {
> > - res->name = dev->full_name;
> > - res->end = res->start + size - 1;
> > - res->parent = NULL;
> > - res->sibling = NULL;
> > - res->child = NULL;
> > - }
> > - }
> > -
> > - /* If there's an ISA hole and the pci_mem_offset is -not- matching
> > - * the ISA hole offset, then we need to remove the ISA hole from
> > - * the resource list for that brige
> > - */
> > - if (isa_hole >= 0 && hose->pci_mem_offset != isa_mb) {
> > - unsigned int next = isa_hole + 1;
> > - pr_info(" Removing ISA hole at 0x%016llx\n", isa_mb);
> > - if (next < memno)
> > - memmove(&hose->mem_resources[isa_hole],
> > - &hose->mem_resources[next],
> > - sizeof(struct resource) * (memno - next));
> > - hose->mem_resources[--memno].flags = 0;
> > - }
> > -}
> > -
> > /* Decide whether to display the domain number in /proc */
> > int pci_proc_domain(struct pci_bus *bus)
> > {
> > diff --git a/arch/powerpc/include/asm/pci-bridge.h b/arch/powerpc/include/asm/pci-bridge.h
> > index 025a130..205bfba 100644
> > --- a/arch/powerpc/include/asm/pci-bridge.h
> > +++ b/arch/powerpc/include/asm/pci-bridge.h
> > @@ -10,6 +10,7 @@
> > #include <linux/pci.h>
> > #include <linux/list.h>
> > #include <linux/ioport.h>
> > +#include <linux/of_pci.h>
> > #include <asm-generic/pci-bridge.h>
> >
> > struct device_node;
> > @@ -231,10 +232,6 @@ extern int pcibios_map_io_space(struct pci_bus *bus);
> > extern struct pci_controller *pci_find_hose_for_OF_device(
> > struct device_node* node);
> >
> > -/* Fill up host controller resources from the OF node */
> > -extern void pci_process_bridge_OF_ranges(struct pci_controller *hose,
> > - struct device_node *dev, int primary);
> > -
> > /* Allocate & free a PCI host bridge structure */
> > extern struct pci_controller *pcibios_alloc_controller(struct device_node *dev);
> > extern void pcibios_free_controller(struct pci_controller *phb);
> > diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
> > index fa12ae4..6edf396 100644
> > --- a/arch/powerpc/kernel/pci-common.c
> > +++ b/arch/powerpc/kernel/pci-common.c
> > @@ -640,198 +640,6 @@ void pci_resource_to_user(const struct pci_dev *dev, int bar,
> > *end = rsrc->end - offset;
> > }
> >
> > -/**
> > - * pci_process_bridge_OF_ranges - Parse PCI bridge resources from device tree
> > - * @hose: newly allocated pci_controller to be setup
> > - * @dev: device node of the host bridge
> > - * @primary: set if primary bus (32 bits only, soon to be deprecated)
> > - *
> > - * This function will parse the "ranges" property of a PCI host bridge device
> > - * node and setup the resource mapping of a pci controller based on its
> > - * content.
> > - *
> > - * Life would be boring if it wasn't for a few issues that we have to deal
> > - * with here:
> > - *
> > - * - We can only cope with one IO space range and up to 3 Memory space
> > - * ranges. However, some machines (thanks Apple !) tend to split their
> > - * space into lots of small contiguous ranges. So we have to coalesce.
> > - *
> > - * - We can only cope with all memory ranges having the same offset
> > - * between CPU addresses and PCI addresses. Unfortunately, some bridges
> > - * are setup for a large 1:1 mapping along with a small "window" which
> > - * maps PCI address 0 to some arbitrary high address of the CPU space in
> > - * order to give access to the ISA memory hole.
> > - * The way out of here that I've chosen for now is to always set the
> > - * offset based on the first resource found, then override it if we
> > - * have a different offset and the previous was set by an ISA hole.
> > - *
> > - * - Some busses have IO space not starting at 0, which causes trouble with
> > - * the way we do our IO resource renumbering. The code somewhat deals with
> > - * it for 64 bits but I would expect problems on 32 bits.
> > - *
> > - * - Some 32 bits platforms such as 4xx can have physical space larger than
> > - * 32 bits so we need to use 64 bits values for the parsing
> > - */
> > -void pci_process_bridge_OF_ranges(struct pci_controller *hose,
> > - struct device_node *dev, int primary)
> > -{
> > - const u32 *ranges;
> > - int rlen;
> > - int pna = of_n_addr_cells(dev);
> > - int np = pna + 5;
> > - int memno = 0, isa_hole = -1;
> > - u32 pci_space;
> > - unsigned long long pci_addr, cpu_addr, pci_next, cpu_next, size;
> > - unsigned long long isa_mb = 0;
> > - struct resource *res;
> > -
> > - printk(KERN_INFO "PCI host bridge %s %s ranges:\n",
> > - dev->full_name, primary ? "(primary)" : "");
> > -
> > - /* Get ranges property */
> > - ranges = of_get_property(dev, "ranges", &rlen);
> > - if (ranges == NULL)
> > - return;
> > -
> > - /* Parse it */
> > - while ((rlen -= np * 4) >= 0) {
> > - /* Read next ranges element */
> > - pci_space = ranges[0];
> > - pci_addr = of_read_number(ranges + 1, 2);
> > - cpu_addr = of_translate_address(dev, ranges + 3);
> > - size = of_read_number(ranges + pna + 3, 2);
> > - ranges += np;
> > -
> > - /* If we failed translation or got a zero-sized region
> > - * (some FW try to feed us with non sensical zero sized regions
> > - * such as power3 which look like some kind of attempt at exposing
> > - * the VGA memory hole)
> > - */
> > - if (cpu_addr == OF_BAD_ADDR || size == 0)
> > - continue;
> > -
> > - /* Now consume following elements while they are contiguous */
> > - for (; rlen >= np * sizeof(u32);
> > - ranges += np, rlen -= np * 4) {
> > - if (ranges[0] != pci_space)
> > - break;
> > - pci_next = of_read_number(ranges + 1, 2);
> > - cpu_next = of_translate_address(dev, ranges + 3);
> > - if (pci_next != pci_addr + size ||
> > - cpu_next != cpu_addr + size)
> > - break;
> > - size += of_read_number(ranges + pna + 3, 2);
> > - }
> > -
> > - /* Act based on address space type */
> > - res = NULL;
> > - switch ((pci_space >> 24) & 0x3) {
> > - case 1: /* PCI IO space */
> > - printk(KERN_INFO
> > - " IO 0x%016llx..0x%016llx -> 0x%016llx\n",
> > - cpu_addr, cpu_addr + size - 1, pci_addr);
> > -
> > - /* We support only one IO range */
> > - if (hose->pci_io_size) {
> > - printk(KERN_INFO
> > - " \\--> Skipped (too many) !\n");
> > - continue;
> > - }
> > -#ifdef CONFIG_PPC32
> > - /* On 32 bits, limit I/O space to 16MB */
> > - if (size > 0x01000000)
> > - size = 0x01000000;
> > -
> > - /* 32 bits needs to map IOs here */
> > - hose->io_base_virt = ioremap(cpu_addr, size);
> > -
> > - /* Expect trouble if pci_addr is not 0 */
> > - if (primary)
> > - isa_io_base =
> > - (unsigned long)hose->io_base_virt;
> > -#endif /* CONFIG_PPC32 */
> > - /* pci_io_size and io_base_phys always represent IO
> > - * space starting at 0 so we factor in pci_addr
> > - */
> > - hose->pci_io_size = pci_addr + size;
> > - hose->io_base_phys = cpu_addr - pci_addr;
> > -
> > - /* Build resource */
> > - res = &hose->io_resource;
> > - res->flags = IORESOURCE_IO;
> > - res->start = pci_addr;
> > - break;
> > - case 2: /* PCI Memory space */
> > - case 3: /* PCI 64 bits Memory space */
> > - printk(KERN_INFO
> > - " MEM 0x%016llx..0x%016llx -> 0x%016llx %s\n",
> > - cpu_addr, cpu_addr + size - 1, pci_addr,
> > - (pci_space & 0x40000000) ? "Prefetch" : "");
> > -
> > - /* We support only 3 memory ranges */
> > - if (memno >= 3) {
> > - printk(KERN_INFO
> > - " \\--> Skipped (too many) !\n");
> > - continue;
> > - }
> > - /* Handles ISA memory hole space here */
> > - if (pci_addr == 0) {
> > - isa_mb = cpu_addr;
> > - isa_hole = memno;
> > - if (primary || isa_mem_base == 0)
> > - isa_mem_base = cpu_addr;
> > - hose->isa_mem_phys = cpu_addr;
> > - hose->isa_mem_size = size;
> > - }
> > -
> > - /* We get the PCI/Mem offset from the first range or
> > - * the, current one if the offset came from an ISA
> > - * hole. If they don't match, bugger.
> > - */
> > - if (memno == 0 ||
> > - (isa_hole >= 0 && pci_addr != 0 &&
> > - hose->pci_mem_offset == isa_mb))
> > - hose->pci_mem_offset = cpu_addr - pci_addr;
> > - else if (pci_addr != 0 &&
> > - hose->pci_mem_offset != cpu_addr - pci_addr) {
> > - printk(KERN_INFO
> > - " \\--> Skipped (offset mismatch) !\n");
> > - continue;
> > - }
> > -
> > - /* Build resource */
> > - res = &hose->mem_resources[memno++];
> > - res->flags = IORESOURCE_MEM;
> > - if (pci_space & 0x40000000)
> > - res->flags |= IORESOURCE_PREFETCH;
> > - res->start = cpu_addr;
> > - break;
> > - }
> > - if (res != NULL) {
> > - res->name = dev->full_name;
> > - res->end = res->start + size - 1;
> > - res->parent = NULL;
> > - res->sibling = NULL;
> > - res->child = NULL;
> > - }
> > - }
> > -
> > - /* If there's an ISA hole and the pci_mem_offset is -not- matching
> > - * the ISA hole offset, then we need to remove the ISA hole from
> > - * the resource list for that brige
> > - */
> > - if (isa_hole >= 0 && hose->pci_mem_offset != isa_mb) {
> > - unsigned int next = isa_hole + 1;
> > - printk(KERN_INFO " Removing ISA hole at 0x%016llx\n", isa_mb);
> > - if (next < memno)
> > - memmove(&hose->mem_resources[isa_hole],
> > - &hose->mem_resources[next],
> > - sizeof(struct resource) * (memno - next));
> > - hose->mem_resources[--memno].flags = 0;
> > - }
> > -}
> > -
> > /* Decide whether to display the domain number in /proc */
> > int pci_proc_domain(struct pci_bus *bus)
> > {
> > diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
> > index 13e37e2..1626172 100644
> > --- a/drivers/of/of_pci.c
> > +++ b/drivers/of/of_pci.c
> > @@ -4,6 +4,10 @@
> > #include <linux/of_pci.h>
> > #include <asm/prom.h>
> >
> > +#if defined(CONFIG_PPC32) || defined(CONFIG_PPC64) || defined(CONFIG_MICROBLAZE)
> > +#include <asm/pci-bridge.h>
> > +#endif
> > +
> > static inline int __of_pci_pci_compare(struct device_node *node,
> > unsigned int devfn)
> > {
> > @@ -40,3 +44,199 @@ struct device_node *of_pci_find_child_device(struct device_node *parent,
> > return NULL;
> > }
> > EXPORT_SYMBOL_GPL(of_pci_find_child_device);
> > +
> > +/**
> > + * pci_process_bridge_OF_ranges - Parse PCI bridge resources from device tree
> > + * @hose: newly allocated pci_controller to be setup
> > + * @dev: device node of the host bridge
> > + * @primary: set if primary bus (32 bits only, soon to be deprecated)
> > + *
> > + * This function will parse the "ranges" property of a PCI host bridge device
> > + * node and setup the resource mapping of a pci controller based on its
> > + * content.
> > + *
> > + * Life would be boring if it wasn't for a few issues that we have to deal
> > + * with here:
> > + *
> > + * - We can only cope with one IO space range and up to 3 Memory space
> > + * ranges. However, some machines (thanks Apple !) tend to split their
> > + * space into lots of small contiguous ranges. So we have to coalesce.
> > + *
> > + * - We can only cope with all memory ranges having the same offset
> > + * between CPU addresses and PCI addresses. Unfortunately, some bridges
> > + * are setup for a large 1:1 mapping along with a small "window" which
> > + * maps PCI address 0 to some arbitrary high address of the CPU space in
> > + * order to give access to the ISA memory hole.
> > + * The way out of here that I've chosen for now is to always set the
> > + * offset based on the first resource found, then override it if we
> > + * have a different offset and the previous was set by an ISA hole.
> > + *
> > + * - Some busses have IO space not starting at 0, which causes trouble with
> > + * the way we do our IO resource renumbering. The code somewhat deals with
> > + * it for 64 bits but I would expect problems on 32 bits.
> > + *
> > + * - Some 32 bits platforms such as 4xx can have physical space larger than
> > + * 32 bits so we need to use 64 bits values for the parsing
> > + */
> > +#if defined(CONFIG_PPC32) || defined(CONFIG_PPC64) || defined(CONFIG_MICROBLAZE)
> > +void pci_process_bridge_OF_ranges(struct pci_controller *hose,
> > + struct device_node *dev, int primary)
> > +{
> > + const u32 *ranges;
> > + int rlen;
> > + int pna = of_n_addr_cells(dev);
> > + int np = pna + 5;
> > + int memno = 0, isa_hole = -1;
> > + u32 pci_space;
> > + unsigned long long pci_addr, cpu_addr, pci_next, cpu_next, size;
> > + unsigned long long isa_mb = 0;
> > + struct resource *res;
> > +
> > + pr_info("PCI host bridge %s %s ranges:\n",
> > + dev->full_name, primary ? "(primary)" : "");
> > +
> > + /* Get ranges property */
> > + ranges = of_get_property(dev, "ranges", &rlen);
> > + if (ranges == NULL)
> > + return;
> > +
> > + /* Parse it */
> > + pr_debug("Parsing ranges property...\n");
> > + while ((rlen -= np * 4) >= 0) {
> > + /* Read next ranges element */
> > + pci_space = ranges[0];
> > + pci_addr = of_read_number(ranges + 1, 2);
> > + cpu_addr = of_translate_address(dev, ranges + 3);
> > + size = of_read_number(ranges + pna + 3, 2);
> > +
> > + pr_debug("pci_space: 0x%08x pci_addr:0x%016llx ",
> > + pci_space, pci_addr);
> > + pr_debug("cpu_addr:0x%016llx size:0x%016llx\n",
> > + cpu_addr, size);
> > +
> > + ranges += np;
> > +
> > + /* If we failed translation or got a zero-sized region
> > + * (some FW try to feed us with non sensical zero sized regions
> > + * such as power3 which look like some kind of attempt
> > + * at exposing the VGA memory hole)
> > + */
> > + if (cpu_addr == OF_BAD_ADDR || size == 0)
> > + continue;
> > +
> > + /* Now consume following elements while they are contiguous */
> > + for (; rlen >= np * sizeof(u32);
> > + ranges += np, rlen -= np * 4) {
> > + if (ranges[0] != pci_space)
> > + break;
> > + pci_next = of_read_number(ranges + 1, 2);
> > + cpu_next = of_translate_address(dev, ranges + 3);
> > + if (pci_next != pci_addr + size ||
> > + cpu_next != cpu_addr + size)
> > + break;
> > + size += of_read_number(ranges + pna + 3, 2);
> > + }
> > +
> > + /* Act based on address space type */
> > + res = NULL;
> > + switch ((pci_space >> 24) & 0x3) {
> > + case 1: /* PCI IO space */
> > + pr_info(" IO 0x%016llx..0x%016llx -> 0x%016llx\n",
> > + cpu_addr, cpu_addr + size - 1, pci_addr);
> > +
> > + /* We support only one IO range */
> > + if (hose->pci_io_size) {
> > + pr_info(" \\--> Skipped (too many) !\n");
> > + continue;
> > + }
> > +#if (!IS_ENABLED(CONFIG_64BIT))
> > + /* On 32 bits, limit I/O space to 16MB */
> > + if (size > 0x01000000)
> > + size = 0x01000000;
> > +
> > + /* 32 bits needs to map IOs here */
> > + hose->io_base_virt = ioremap(cpu_addr, size);
> > +
> > + /* Expect trouble if pci_addr is not 0 */
> > + if (primary)
> > + isa_io_base =
> > + (unsigned long)hose->io_base_virt;
> > +#endif /* !CONFIG_64BIT */
> > + /* pci_io_size and io_base_phys always represent IO
> > + * space starting at 0 so we factor in pci_addr
> > + */
> > + hose->pci_io_size = pci_addr + size;
> > + hose->io_base_phys = cpu_addr - pci_addr;
> > +
> > + /* Build resource */
> > + res = &hose->io_resource;
> > + res->flags = IORESOURCE_IO;
> > + res->start = pci_addr;
> > + break;
> > + case 2: /* PCI Memory space */
> > + case 3: /* PCI 64 bits Memory space */
> > + pr_info(" MEM 0x%016llx..0x%016llx -> 0x%016llx %s\n",
> > + cpu_addr, cpu_addr + size - 1, pci_addr,
> > + (pci_space & 0x40000000) ? "Prefetch" : "");
> > +
> > + /* We support only 3 memory ranges */
> > + if (memno >= 3) {
> > + pr_info(" \\--> Skipped (too many) !\n");
> > + continue;
> > + }
> > + /* Handles ISA memory hole space here */
> > + if (pci_addr == 0) {
> > + isa_mb = cpu_addr;
> > + isa_hole = memno;
> > + if (primary || isa_mem_base == 0)
> > + isa_mem_base = cpu_addr;
> > + hose->isa_mem_phys = cpu_addr;
> > + hose->isa_mem_size = size;
> > + }
> > +
> > + /* We get the PCI/Mem offset from the first range or
> > + * the, current one if the offset came from an ISA
> > + * hole. If they don't match, bugger.
> > + */
> > + if (memno == 0 ||
> > + (isa_hole >= 0 && pci_addr != 0 &&
> > + hose->pci_mem_offset == isa_mb))
> > + hose->pci_mem_offset = cpu_addr - pci_addr;
> > + else if (pci_addr != 0 &&
> > + hose->pci_mem_offset != cpu_addr - pci_addr) {
> > + pr_info(" \\--> Skipped (offset mismatch) !\n");
> > + continue;
> > + }
> > +
> > + /* Build resource */
> > + res = &hose->mem_resources[memno++];
> > + res->flags = IORESOURCE_MEM;
> > + if (pci_space & 0x40000000)
> > + res->flags |= IORESOURCE_PREFETCH;
> > + res->start = cpu_addr;
> > + break;
> > + }
> > + if (res != NULL) {
> > + res->name = dev->full_name;
> > + res->end = res->start + size - 1;
> > + res->parent = NULL;
> > + res->sibling = NULL;
> > + res->child = NULL;
> > + }
> > + }
> > +
> > + /* If there's an ISA hole and the pci_mem_offset is -not- matching
> > + * the ISA hole offset, then we need to remove the ISA hole from
> > + * the resource list for that brige
> > + */
> > + if (isa_hole >= 0 && hose->pci_mem_offset != isa_mb) {
> > + unsigned int next = isa_hole + 1;
> > + pr_info(" Removing ISA hole at 0x%016llx\n", isa_mb);
> > + if (next < memno)
> > + memmove(&hose->mem_resources[isa_hole],
> > + &hose->mem_resources[next],
> > + sizeof(struct resource) * (memno - next));
> > + hose->mem_resources[--memno].flags = 0;
> > + }
> > +}
> > +#endif
> > diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h
> > index bb115de..33e8ead 100644
> > --- a/include/linux/of_pci.h
> > +++ b/include/linux/of_pci.h
> > @@ -11,4 +11,8 @@ struct device_node;
> > struct device_node *of_pci_find_child_device(struct device_node *parent,
> > unsigned int devfn);
> >
> > +struct pci_controller;
> > +void pci_process_bridge_OF_ranges(struct pci_controller *hose,
> > + struct device_node *dev, int primary);
> > +
> > #endif
>
>
>
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