[PATCH v3] of/pci: Provide support for parsing PCI DT ranges property
Rob Herring
robherring2 at gmail.com
Tue Apr 9 02:58:58 EST 2013
Adding PPC and Microblaze maintainers.
On 04/08/2013 09:33 AM, Andrew Murray wrote:
> This patch factors out common implementation patterns to reduce overall kernel
> code and provide a means for host bridge drivers to directly obtain struct
> resources from the DT's ranges property without relying on architecture specific
> DT handling. This will make it easier to write archiecture independent host bridge
> drivers and mitigate against further duplication of DT parsing code.
>
> This patch can be used in the following way:
>
> struct of_pci_range_parser parser;
> struct of_pci_range range;
>
> if (of_pci_range_parser(&parser, np))
> ; //no ranges property
>
> for_each_of_pci_range(&parser, &range) {
>
> /*
> directly access properties of the address range, e.g.:
> range.pci_space, range.pci_addr, range.cpu_addr,
> range.size, range.flags
>
> alternatively obtain a struct resource, e.g.:
> struct resource res;
> of_pci_range_to_resource(&range, np, &res);
> */
> }
>
> Additionally the implementation takes care of adjacent ranges and merges them
> into a single range (as was the case with powerpc and microblaze).
>
> The modifications to microblaze, mips and powerpc have not been tested.
>
> Signed-off-by: Andrew Murray <Andrew.Murray at arm.com>
> Signed-off-by: Liviu Dudau <Liviu.Dudau at arm.com>
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
> ---
> Compared to the v3 sent by Andrew Murray, the following changes have
> been made:
>
> * Unify and move duplicate pci_process_bridge_OF_ranges functions to
> drivers/of/of_pci.c as suggested by Rob Herring
This part should really be a separate patch with just the move and
should have acks from PPC and Microblaze maintainers.
Otherwise it looks okay to me.
Rob
> * Fix potential build errors with Microblaze/MIPS
>
> Compared to "[PATCH v5 01/17] of/pci: Provide support for parsing PCI DT
> ranges property", the following changes have been made:
>
> * Correct use of IORESOURCE_* as suggested by Russell King
>
> * Improved interface and naming as suggested by Thierry Reding
>
> Compared to the v2 sent by Andrew Murray, Thomas Petazzoni did:
>
> * Add a memset() on the struct of_pci_range_iter when starting the
> for loop in for_each_pci_range(). Otherwise, with an uninitialized
> of_pci_range_iter, of_pci_process_ranges() may crash.
>
> * Add parenthesis around 'res', 'np' and 'iter' in the
> for_each_of_pci_range macro definitions. Otherwise, passing
> something like &foobar as 'res' didn't work.
>
> * Rebased on top of 3.9-rc2, which required fixing a few conflicts in
> the Microblaze code.
>
> v2:
> This follows on from suggestions made by Grant Likely
> (marc.info/?l=linux-kernel&m=136079602806328)
> ---
> arch/microblaze/include/asm/pci-bridge.h | 5 +-
> arch/microblaze/pci/pci-common.c | 192 ------------------------------
> arch/mips/pci/pci.c | 50 +++------
> arch/powerpc/include/asm/pci-bridge.h | 5 +-
> arch/powerpc/kernel/pci-common.c | 192 ------------------------------
> drivers/of/address.c | 63 ++++++++++
> drivers/of/of_pci.c | 168 ++++++++++++++++++++++++++
> include/linux/of_address.h | 42 +++++++
> include/linux/of_pci.h | 3 +
> 9 files changed, 294 insertions(+), 426 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/mips/pci/pci.c b/arch/mips/pci/pci.c
> index 0872f12..bee49a4 100644
> --- a/arch/mips/pci/pci.c
> +++ b/arch/mips/pci/pci.c
> @@ -122,51 +122,33 @@ static void pcibios_scanbus(struct pci_controller *hose)
> #ifdef CONFIG_OF
> void pci_load_of_ranges(struct pci_controller *hose, struct device_node *node)
> {
> - const __be32 *ranges;
> - int rlen;
> - int pna = of_n_addr_cells(node);
> - int np = pna + 5;
> + struct of_pci_range_range range;
> + struct of_pci_range_parser parser;
> + u32 res_type;
>
> pr_info("PCI host bridge %s ranges:\n", node->full_name);
> - ranges = of_get_property(node, "ranges", &rlen);
> - if (ranges == NULL)
> - return;
> hose->of_node = node;
>
> - while ((rlen -= np * 4) >= 0) {
> - u32 pci_space;
> + if (of_pci_range_parser(&parser, node))
> + return;
> +
> + for_each_of_pci_range(&parser, &range) {
> struct resource *res = NULL;
> - u64 addr, size;
> -
> - pci_space = be32_to_cpup(&ranges[0]);
> - addr = of_translate_address(node, ranges + 3);
> - size = of_read_number(ranges + pna + 3, 2);
> - ranges += np;
> - switch ((pci_space >> 24) & 0x3) {
> - case 1: /* PCI IO space */
> +
> + res_type = range.flags & IORESOURCE_TYPE_BITS;
> + if (res_type == IORESOURCE_IO) {
> pr_info(" IO 0x%016llx..0x%016llx\n",
> - addr, addr + size - 1);
> + range.addr, range.addr + range.size - 1);
> hose->io_map_base =
> - (unsigned long)ioremap(addr, size);
> + (unsigned long)ioremap(range.addr, range.size);
> res = hose->io_resource;
> - res->flags = IORESOURCE_IO;
> - break;
> - case 2: /* PCI Memory space */
> - case 3: /* PCI 64 bits Memory space */
> + } else if (res_type == IORESOURCE_MEM) {
> pr_info(" MEM 0x%016llx..0x%016llx\n",
> - addr, addr + size - 1);
> + range.addr, range.addr + range.size - 1);
> res = hose->mem_resource;
> - res->flags = IORESOURCE_MEM;
> - break;
> - }
> - if (res != NULL) {
> - res->start = addr;
> - res->name = node->full_name;
> - res->end = res->start + size - 1;
> - res->parent = NULL;
> - res->sibling = NULL;
> - res->child = NULL;
> }
> + if (res != NULL)
> + of_pci_range_to_resource(&range, node, res);
> }
> }
> #endif
> 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/address.c b/drivers/of/address.c
> index 04da786..e87f45e 100644
> --- a/drivers/of/address.c
> +++ b/drivers/of/address.c
> @@ -227,6 +227,69 @@ int of_pci_address_to_resource(struct device_node *dev, int bar,
> return __of_address_to_resource(dev, addrp, size, flags, NULL, r);
> }
> EXPORT_SYMBOL_GPL(of_pci_address_to_resource);
> +
> +int of_pci_range_parser(struct of_pci_range_parser *parser,
> + struct device_node *node)
> +{
> + const int na = 3, ns = 2;
> + int rlen;
> +
> + parser->node = node;
> + parser->pna = of_n_addr_cells(node);
> + parser->np = parser->pna + na + ns;
> +
> + parser->range = of_get_property(node, "ranges", &rlen);
> + if (parser->range == NULL)
> + return -ENOENT;
> +
> + parser->end = parser->range + rlen / sizeof(__be32);
> +
> + return 0;
> +}
> +
> +struct of_pci_range *of_pci_process_ranges(struct of_pci_range_parser *parser,
> + struct of_pci_range *range)
> +{
> + const int na = 3, ns = 2;
> +
> + if (!parser->range || parser->range + parser->np > parser->end)
> + return NULL;
> +
> + range->pci_space = be32_to_cpup(parser->range);
> + range->flags = of_bus_pci_get_flags(parser->range);
> + range->pci_addr = of_read_number(parser->range + 1, ns);
> + range->cpu_addr = of_translate_address(parser->node,
> + parser->range + na);
> + range->size = of_read_number(parser->range + parser->pna + na, ns);
> +
> + parser->range += parser->np;
> +
> + /* Now consume following elements while they are contiguous */
> + while (parser->range + parser->np <= parser->end) {
> + u32 flags, pci_space;
> + u64 pci_addr, cpu_addr, size;
> +
> + pci_space = be32_to_cpup(parser->range);
> + flags = of_bus_pci_get_flags(parser->range);
> + pci_addr = of_read_number(parser->range + 1, ns);
> + cpu_addr = of_translate_address(parser->node,
> + parser->range + na);
> + size = of_read_number(parser->range + parser->pna + na, ns);
> +
> + if (flags != range->flags)
> + break;
> + if (pci_addr != range->pci_addr + range->size ||
> + cpu_addr != range->cpu_addr + range->size)
> + break;
> +
> + range->size += size;
> + parser->range += parser->np;
> + }
> +
> + return range;
> +}
> +EXPORT_SYMBOL_GPL(of_pci_process_ranges);
> +
> #endif /* CONFIG_PCI */
>
> /*
> diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
> index 13e37e2..f88bd18 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 +44,167 @@ 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)
> +{
> + int memno = 0, isa_hole = -1;
> + unsigned long long isa_mb = 0;
> + struct resource *res;
> + struct of_pci_range range;
> + struct of_pci_range_parser parser;
> + u32 res_type;
> +
> + pr_info("PCI host bridge %s %s ranges:\n",
> + dev->full_name, primary ? "(primary)" : "");
> +
> + /* Check for ranges property */
> + if (of_pci_range_parser(&parser, dev))
> + return;
> +
> + pr_debug("Parsing ranges property...\n");
> + for_each_of_pci_range(&parser, &range) {
> + /* Read next ranges element */
> + pr_debug("pci_space: 0x%08x pci_addr: 0x%016llx ",
> + range.pci_space, range.pci_addr);
> + pr_debug("cpu_addr: 0x%016llx size: 0x%016llx\n",
> + range.cpu_addr, range.size);
> +
> + /* 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 (range.cpu_addr == OF_BAD_ADDR || range.size == 0)
> + continue;
> +
> + /* Act based on address space type */
> + res = NULL;
> + res_type = range.flags & IORESOURCE_TYPE_BITS;
> + if (res_type == IORESOURCE_IO) {
> + pr_info(" IO 0x%016llx..0x%016llx -> 0x%016llx\n",
> + range.cpu_addr, range.cpu_addr + range.size - 1,
> + range.pci_addr);
> +
> + /* We support only one IO range */
> + if (hose->pci_io_size) {
> + pr_info(" \\--> Skipped (too many) !\n");
> + continue;
> + }
> +#if defined(CONFIG_PPC32) || defined(CONFIG_MICROBLAZE)
> + /* On 32 bits, limit I/O space to 16MB */
> + if (range.size > 0x01000000)
> + range.size = 0x01000000;
> +
> + /* 32 bits needs to map IOs here */
> + hose->io_base_virt = ioremap(range.cpu_addr,
> + range.size);
> +
> + /* Expect trouble if pci_addr is not 0 */
> + if (primary)
> + isa_io_base =
> + (unsigned long)hose->io_base_virt;
> +#endif /* CONFIG_PPC32 || CONFIG_MICROBLAZE */
> + /* pci_io_size and io_base_phys always represent IO
> + * space starting at 0 so we factor in pci_addr
> + */
> + hose->pci_io_size = range.pci_addr + range.size;
> + hose->io_base_phys = range.cpu_addr - range.pci_addr;
> +
> + /* Build resource */
> + res = &hose->io_resource;
> + range.cpu_addr = range.pci_addr;
> + } else if (res_type == IORESOURCE_MEM) {
> + pr_info(" MEM 0x%016llx..0x%016llx -> 0x%016llx %s\n",
> + range.cpu_addr, range.cpu_addr + range.size - 1,
> + range.pci_addr,
> + (range.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 (range.pci_addr == 0) {
> + isa_mb = range.cpu_addr;
> + isa_hole = memno;
> + if (primary || isa_mem_base == 0)
> + isa_mem_base = range.cpu_addr;
> + hose->isa_mem_phys = range.cpu_addr;
> + hose->isa_mem_size = range.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 && range.pci_addr != 0 &&
> + hose->pci_mem_offset == isa_mb))
> + hose->pci_mem_offset = range.cpu_addr -
> + range.pci_addr;
> + else if (range.pci_addr != 0 &&
> + hose->pci_mem_offset != range.cpu_addr -
> + range.pci_addr) {
> + pr_info(" \\--> Skipped (offset mismatch) !\n");
> + continue;
> + }
> +
> + /* Build resource */
> + res = &hose->mem_resources[memno++];
> + }
> + if (res != NULL)
> + of_pci_range_to_resource(&range, dev, res);
> + }
> +
> + /* 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_address.h b/include/linux/of_address.h
> index 0506eb5..c7003a3 100644
> --- a/include/linux/of_address.h
> +++ b/include/linux/of_address.h
> @@ -4,6 +4,32 @@
> #include <linux/errno.h>
> #include <linux/of.h>
>
> +struct of_pci_range_parser {
> + struct device_node *node;
> + const __be32 *range, *end;
> + int np, pna;
> +};
> +
> +struct of_pci_range {
> + u32 pci_space;
> + u64 pci_addr;
> + u64 cpu_addr;
> + u64 size;
> + u32 flags;
> +};
> +
> +#define for_each_of_pci_range(parser, range) \
> + for (; of_pci_process_ranges(parser, range);)
> +
> +#define of_pci_range_to_resource(range, np, res) \
> + do { \
> + (res)->flags = (range)->flags; \
> + (res)->start = (range)->cpu_addr; \
> + (res)->end = (range)->cpu_addr + (range)->size - 1; \
> + (res)->parent = (res)->child = (res)->sibling = NULL; \
> + (res)->name = (np)->full_name; \
> + } while (0)
> +
> #ifdef CONFIG_OF_ADDRESS
> extern u64 of_translate_address(struct device_node *np, const __be32 *addr);
> extern bool of_can_translate_address(struct device_node *dev);
> @@ -27,6 +53,10 @@ static inline unsigned long pci_address_to_pio(phys_addr_t addr) { return -1; }
> #define pci_address_to_pio pci_address_to_pio
> #endif
>
> +int of_pci_range_parser(struct of_pci_range_parser *parser,
> + struct device_node *node);
> +struct of_pci_range *of_pci_process_ranges(struct of_pci_range_parser *parser,
> + struct of_pci_range *range);
> #else /* CONFIG_OF_ADDRESS */
> #ifndef of_address_to_resource
> static inline int of_address_to_resource(struct device_node *dev, int index,
> @@ -53,6 +83,18 @@ static inline const __be32 *of_get_address(struct device_node *dev, int index,
> {
> return NULL;
> }
> +
> +int of_pci_range_parser(struct of_pci_range_parser *parser,
> + struct device_noed *node)
> +{
> + return -1;
> +}
> +
> +struct of_pci_range *of_pci_process_ranges(struct of_pci_range_parser *parser,
> + struct of_pci_range *range)
> +{
> + return NULL;
> +}
> #endif /* CONFIG_OF_ADDRESS */
>
>
> diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h
> index bb115de..6852481 100644
> --- a/include/linux/of_pci.h
> +++ b/include/linux/of_pci.h
> @@ -11,4 +11,7 @@ struct device_node;
> struct device_node *of_pci_find_child_device(struct device_node *parent,
> unsigned int devfn);
>
> +void pci_process_bridge_OF_ranges(struct pci_controller *hose,
> + struct device_node *dev, int primary);
> +
> #endif
>
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