MIPS: pci: parse memory ranges from devicetree
Implement pci_load_of_ranges on MIPS. Due to lack of test hardware only 32bit bus width is supported. This function is based on pci_process_bridge_OF_ranges from powerpc. Signed-off-by: John Crispin <blogic@openwrt.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/3729/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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@ -17,6 +17,7 @@
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*/
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#include <linux/ioport.h>
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#include <linux/of.h>
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/*
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* Each pci channel is a top-level PCI bus seem by CPU. A machine with
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@ -26,6 +27,7 @@
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struct pci_controller {
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struct pci_controller *next;
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struct pci_bus *bus;
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struct device_node *of_node;
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struct pci_ops *pci_ops;
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struct resource *mem_resource;
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@ -142,4 +144,8 @@ static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
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extern char * (*pcibios_plat_setup)(char *str);
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/* this function parses memory ranges from a device node */
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extern void __devinit pci_load_of_ranges(struct pci_controller *hose,
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struct device_node *node);
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#endif /* _ASM_PCI_H */
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@ -16,6 +16,7 @@
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/of_address.h>
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#include <asm/cpu-info.h>
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@ -114,9 +115,63 @@ static void __devinit pcibios_scanbus(struct pci_controller *hose)
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pci_bus_assign_resources(bus);
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pci_enable_bridges(bus);
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}
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bus->dev.of_node = hose->of_node;
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}
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}
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#ifdef CONFIG_OF
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void __devinit pci_load_of_ranges(struct pci_controller *hose,
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struct device_node *node)
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{
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const __be32 *ranges;
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int rlen;
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int pna = of_n_addr_cells(node);
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int np = pna + 5;
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pr_info("PCI host bridge %s ranges:\n", node->full_name);
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ranges = of_get_property(node, "ranges", &rlen);
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if (ranges == NULL)
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return;
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hose->of_node = node;
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while ((rlen -= np * 4) >= 0) {
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u32 pci_space;
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struct resource *res = NULL;
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u64 addr, size;
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pci_space = be32_to_cpup(&ranges[0]);
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addr = of_translate_address(node, ranges + 3);
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size = of_read_number(ranges + pna + 3, 2);
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ranges += np;
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switch ((pci_space >> 24) & 0x3) {
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case 1: /* PCI IO space */
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pr_info(" IO 0x%016llx..0x%016llx\n",
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addr, addr + size - 1);
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hose->io_map_base =
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(unsigned long)ioremap(addr, size);
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res = hose->io_resource;
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res->flags = IORESOURCE_IO;
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break;
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case 2: /* PCI Memory space */
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case 3: /* PCI 64 bits Memory space */
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pr_info(" MEM 0x%016llx..0x%016llx\n",
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addr, addr + size - 1);
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res = hose->mem_resource;
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res->flags = IORESOURCE_MEM;
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break;
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}
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if (res != NULL) {
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res->start = addr;
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res->name = node->full_name;
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res->end = res->start + size - 1;
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res->parent = NULL;
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res->sibling = NULL;
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res->child = NULL;
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}
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}
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}
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#endif
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static DEFINE_MUTEX(pci_scan_mutex);
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void __devinit register_pci_controller(struct pci_controller *hose)
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