| Message ID | 516C2FEF.7080006@monstr.eu (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Mon, Apr 15, 2013 at 05:50:55PM +0100, Michal Simek wrote: > That's why please add this header to this patch. > > diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c > index 3e428a1..f30887e 100644 > --- a/drivers/of/of_pci.c > +++ b/drivers/of/of_pci.c > @@ -1,6 +1,7 @@ > #include <linux/kernel.h> > #include <linux/export.h> > #include <linux/of.h> > +#include <linux/of_address.h> > #include <linux/of_pci.h> > #include <asm/prom.h> > > > When you fix it: > Acked-by: Michal Simek <monstr@monstr.eu> I've added this fix to the latest patchset (v7) and also your Ack - thanks for your feedback (and the robot...). Andrew Murray
diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c index 3e428a1..f30887e 100644 --- a/drivers/of/of_pci.c +++ b/drivers/of/of_pci.c @@ -1,6 +1,7 @@ #include <linux/kernel.h> #include <linux/export.h> #include <linux/of.h> +#include <linux/of_address.h> #include <linux/of_pci.h> #include <asm/prom.h>
Hi Thomas and Andrew, First of all I would recommend you to add your tree to 0-day testing system where you can easily catch up compilation failures for microblaze and others. Getting this compilation failure: drivers/of/of_pci.c: In function 'pci_process_bridge_OF_ranges': drivers/of/of_pci.c:88:22: error: storage size of 'range' isn't known drivers/of/of_pci.c:89:29: error: storage size of 'parser' isn't known drivers/of/of_pci.c:96:2: error: implicit declaration of function 'of_pci_range_parser' [-Werror=implicit-function-declaration] drivers/of/of_pci.c:100:2: error: implicit declaration of function 'for_each_of_pci_range' [-Werror=implicit-function-declaration] drivers/of/of_pci.c:100:41: error: expected ';' before '{' token drivers/of/of_pci.c:90:6: warning: unused variable 'res_type' [-Wunused-variable] drivers/of/of_pci.c:89:29: warning: unused variable 'parser' [-Wunused-variable] drivers/of/of_pci.c:88:22: warning: unused variable 'range' [-Wunused-variable] drivers/of/of_pci.c:87:19: warning: unused variable 'res' [-Wunused-variable] drivers/of/of_pci.c:86:21: warning: unused variable 'isa_mb' [-Wunused-variable] drivers/of/of_pci.c:85:17: warning: unused variable 'isa_hole' [-Wunused-variable] drivers/of/of_pci.c:85:6: warning: unused variable 'memno' [-Wunused-variable] which is caused missing linux/of_addresss.h in of_pci.c. PowerPC probably won't have this problem because you have this header in asm/prom.h but based on the same comment it is better to add it directly to the files. That's why please add this header to this patch. When you fix it: Acked-by: Michal Simek <monstr@monstr.eu> Thanks, Michal On 04/15/2013 02:57 PM, 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. > > 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@arm.com> >> Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com> >> Reviewed-by: Rob Herring <rob.herring@calxeda.com> >> Tested-by: Thomas Petazzoni <thomas.petazzoni@free-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 > > >