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Message-ID: <20130415145741.4e4c362b@skate>
Date: Mon, 15 Apr 2013 14:57:41 +0200
From: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To: monstr@...str.eu, benh@...nel.crashing.org
Cc: 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
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.
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.
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
--
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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