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-rw-r--r--arch/powerpc/kernel/pci-common.c1735
1 files changed, 1735 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
new file mode 100644
index 000000000..d67cf79bf
--- /dev/null
+++ b/arch/powerpc/kernel/pci-common.c
@@ -0,0 +1,1735 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Contains common pci routines for ALL ppc platform
+ * (based on pci_32.c and pci_64.c)
+ *
+ * Port for PPC64 David Engebretsen, IBM Corp.
+ * Contains common pci routines for ppc64 platform, pSeries and iSeries brands.
+ *
+ * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
+ * Rework, based on alpha PCI code.
+ *
+ * Common pmac/prep/chrp pci routines. -- Cort
+ */
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/export.h>
+#include <linux/of_address.h>
+#include <linux/of_pci.h>
+#include <linux/mm.h>
+#include <linux/shmem_fs.h>
+#include <linux/list.h>
+#include <linux/syscalls.h>
+#include <linux/irq.h>
+#include <linux/vmalloc.h>
+#include <linux/slab.h>
+#include <linux/vgaarb.h>
+#include <linux/numa.h>
+#include <linux/msi.h>
+#include <linux/irqdomain.h>
+
+#include <asm/processor.h>
+#include <asm/io.h>
+#include <asm/pci-bridge.h>
+#include <asm/byteorder.h>
+#include <asm/machdep.h>
+#include <asm/ppc-pci.h>
+#include <asm/eeh.h>
+#include <asm/setup.h>
+
+#include "../../../drivers/pci/pci.h"
+
+/* hose_spinlock protects accesses to the phb_bitmap. */
+static DEFINE_SPINLOCK(hose_spinlock);
+LIST_HEAD(hose_list);
+
+/* For dynamic PHB numbering on get_phb_number(): max number of PHBs. */
+#define MAX_PHBS 0x10000
+
+/*
+ * For dynamic PHB numbering: used/free PHBs tracking bitmap.
+ * Accesses to this bitmap should be protected by hose_spinlock.
+ */
+static DECLARE_BITMAP(phb_bitmap, MAX_PHBS);
+
+/* ISA Memory physical address */
+resource_size_t isa_mem_base;
+EXPORT_SYMBOL(isa_mem_base);
+
+
+static const struct dma_map_ops *pci_dma_ops;
+
+void __init set_pci_dma_ops(const struct dma_map_ops *dma_ops)
+{
+ pci_dma_ops = dma_ops;
+}
+
+static int get_phb_number(struct device_node *dn)
+{
+ int ret, phb_id = -1;
+ u64 prop;
+
+ /*
+ * Try fixed PHB numbering first, by checking archs and reading
+ * the respective device-tree properties. Firstly, try reading
+ * standard "linux,pci-domain", then try reading "ibm,opal-phbid"
+ * (only present in powernv OPAL environment), then try device-tree
+ * alias and as the last try to use lower bits of "reg" property.
+ */
+ ret = of_get_pci_domain_nr(dn);
+ if (ret >= 0) {
+ prop = ret;
+ ret = 0;
+ }
+ if (ret)
+ ret = of_property_read_u64(dn, "ibm,opal-phbid", &prop);
+
+ if (ret) {
+ ret = of_alias_get_id(dn, "pci");
+ if (ret >= 0) {
+ prop = ret;
+ ret = 0;
+ }
+ }
+ if (ret) {
+ u32 prop_32;
+ ret = of_property_read_u32_index(dn, "reg", 1, &prop_32);
+ prop = prop_32;
+ }
+
+ if (!ret)
+ phb_id = (int)(prop & (MAX_PHBS - 1));
+
+ spin_lock(&hose_spinlock);
+
+ /* We need to be sure to not use the same PHB number twice. */
+ if ((phb_id >= 0) && !test_and_set_bit(phb_id, phb_bitmap))
+ goto out_unlock;
+
+ /* If everything fails then fallback to dynamic PHB numbering. */
+ phb_id = find_first_zero_bit(phb_bitmap, MAX_PHBS);
+ BUG_ON(phb_id >= MAX_PHBS);
+ set_bit(phb_id, phb_bitmap);
+
+out_unlock:
+ spin_unlock(&hose_spinlock);
+
+ return phb_id;
+}
+
+struct pci_controller *pcibios_alloc_controller(struct device_node *dev)
+{
+ struct pci_controller *phb;
+
+ phb = zalloc_maybe_bootmem(sizeof(struct pci_controller), GFP_KERNEL);
+ if (phb == NULL)
+ return NULL;
+
+ phb->global_number = get_phb_number(dev);
+
+ spin_lock(&hose_spinlock);
+ list_add_tail(&phb->list_node, &hose_list);
+ spin_unlock(&hose_spinlock);
+
+ phb->dn = of_node_get(dev);
+ phb->is_dynamic = slab_is_available();
+#ifdef CONFIG_PPC64
+ if (dev) {
+ int nid = of_node_to_nid(dev);
+
+ if (nid < 0 || !node_online(nid))
+ nid = NUMA_NO_NODE;
+
+ PHB_SET_NODE(phb, nid);
+ }
+#endif
+ return phb;
+}
+EXPORT_SYMBOL_GPL(pcibios_alloc_controller);
+
+void pcibios_free_controller(struct pci_controller *phb)
+{
+ spin_lock(&hose_spinlock);
+
+ /* Clear bit of phb_bitmap to allow reuse of this PHB number. */
+ if (phb->global_number < MAX_PHBS)
+ clear_bit(phb->global_number, phb_bitmap);
+ of_node_put(phb->dn);
+ list_del(&phb->list_node);
+ spin_unlock(&hose_spinlock);
+
+ if (phb->is_dynamic)
+ kfree(phb);
+}
+EXPORT_SYMBOL_GPL(pcibios_free_controller);
+
+/*
+ * This function is used to call pcibios_free_controller()
+ * in a deferred manner: a callback from the PCI subsystem.
+ *
+ * _*DO NOT*_ call pcibios_free_controller() explicitly if
+ * this is used (or it may access an invalid *phb pointer).
+ *
+ * The callback occurs when all references to the root bus
+ * are dropped (e.g., child buses/devices and their users).
+ *
+ * It's called as .release_fn() of 'struct pci_host_bridge'
+ * which is associated with the 'struct pci_controller.bus'
+ * (root bus) - it expects .release_data to hold a pointer
+ * to 'struct pci_controller'.
+ *
+ * In order to use it, register .release_fn()/release_data
+ * like this:
+ *
+ * pci_set_host_bridge_release(bridge,
+ * pcibios_free_controller_deferred
+ * (void *) phb);
+ *
+ * e.g. in the pcibios_root_bridge_prepare() callback from
+ * pci_create_root_bus().
+ */
+void pcibios_free_controller_deferred(struct pci_host_bridge *bridge)
+{
+ struct pci_controller *phb = (struct pci_controller *)
+ bridge->release_data;
+
+ pr_debug("domain %d, dynamic %d\n", phb->global_number, phb->is_dynamic);
+
+ pcibios_free_controller(phb);
+}
+EXPORT_SYMBOL_GPL(pcibios_free_controller_deferred);
+
+/*
+ * The function is used to return the minimal alignment
+ * for memory or I/O windows of the associated P2P bridge.
+ * By default, 4KiB alignment for I/O windows and 1MiB for
+ * memory windows.
+ */
+resource_size_t pcibios_window_alignment(struct pci_bus *bus,
+ unsigned long type)
+{
+ struct pci_controller *phb = pci_bus_to_host(bus);
+
+ if (phb->controller_ops.window_alignment)
+ return phb->controller_ops.window_alignment(bus, type);
+
+ /*
+ * PCI core will figure out the default
+ * alignment: 4KiB for I/O and 1MiB for
+ * memory window.
+ */
+ return 1;
+}
+
+void pcibios_setup_bridge(struct pci_bus *bus, unsigned long type)
+{
+ struct pci_controller *hose = pci_bus_to_host(bus);
+
+ if (hose->controller_ops.setup_bridge)
+ hose->controller_ops.setup_bridge(bus, type);
+}
+
+void pcibios_reset_secondary_bus(struct pci_dev *dev)
+{
+ struct pci_controller *phb = pci_bus_to_host(dev->bus);
+
+ if (phb->controller_ops.reset_secondary_bus) {
+ phb->controller_ops.reset_secondary_bus(dev);
+ return;
+ }
+
+ pci_reset_secondary_bus(dev);
+}
+
+resource_size_t pcibios_default_alignment(void)
+{
+ if (ppc_md.pcibios_default_alignment)
+ return ppc_md.pcibios_default_alignment();
+
+ return 0;
+}
+
+#ifdef CONFIG_PCI_IOV
+resource_size_t pcibios_iov_resource_alignment(struct pci_dev *pdev, int resno)
+{
+ if (ppc_md.pcibios_iov_resource_alignment)
+ return ppc_md.pcibios_iov_resource_alignment(pdev, resno);
+
+ return pci_iov_resource_size(pdev, resno);
+}
+
+int pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
+{
+ if (ppc_md.pcibios_sriov_enable)
+ return ppc_md.pcibios_sriov_enable(pdev, num_vfs);
+
+ return 0;
+}
+
+int pcibios_sriov_disable(struct pci_dev *pdev)
+{
+ if (ppc_md.pcibios_sriov_disable)
+ return ppc_md.pcibios_sriov_disable(pdev);
+
+ return 0;
+}
+
+#endif /* CONFIG_PCI_IOV */
+
+static resource_size_t pcibios_io_size(const struct pci_controller *hose)
+{
+#ifdef CONFIG_PPC64
+ return hose->pci_io_size;
+#else
+ return resource_size(&hose->io_resource);
+#endif
+}
+
+int pcibios_vaddr_is_ioport(void __iomem *address)
+{
+ int ret = 0;
+ struct pci_controller *hose;
+ resource_size_t size;
+
+ spin_lock(&hose_spinlock);
+ list_for_each_entry(hose, &hose_list, list_node) {
+ size = pcibios_io_size(hose);
+ if (address >= hose->io_base_virt &&
+ address < (hose->io_base_virt + size)) {
+ ret = 1;
+ break;
+ }
+ }
+ spin_unlock(&hose_spinlock);
+ return ret;
+}
+
+unsigned long pci_address_to_pio(phys_addr_t address)
+{
+ struct pci_controller *hose;
+ resource_size_t size;
+ unsigned long ret = ~0;
+
+ spin_lock(&hose_spinlock);
+ list_for_each_entry(hose, &hose_list, list_node) {
+ size = pcibios_io_size(hose);
+ if (address >= hose->io_base_phys &&
+ address < (hose->io_base_phys + size)) {
+ unsigned long base =
+ (unsigned long)hose->io_base_virt - _IO_BASE;
+ ret = base + (address - hose->io_base_phys);
+ break;
+ }
+ }
+ spin_unlock(&hose_spinlock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(pci_address_to_pio);
+
+/*
+ * Return the domain number for this bus.
+ */
+int pci_domain_nr(struct pci_bus *bus)
+{
+ struct pci_controller *hose = pci_bus_to_host(bus);
+
+ return hose->global_number;
+}
+EXPORT_SYMBOL(pci_domain_nr);
+
+/* This routine is meant to be used early during boot, when the
+ * PCI bus numbers have not yet been assigned, and you need to
+ * issue PCI config cycles to an OF device.
+ * It could also be used to "fix" RTAS config cycles if you want
+ * to set pci_assign_all_buses to 1 and still use RTAS for PCI
+ * config cycles.
+ */
+struct pci_controller* pci_find_hose_for_OF_device(struct device_node* node)
+{
+ while(node) {
+ struct pci_controller *hose, *tmp;
+ list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
+ if (hose->dn == node)
+ return hose;
+ node = node->parent;
+ }
+ return NULL;
+}
+
+struct pci_controller *pci_find_controller_for_domain(int domain_nr)
+{
+ struct pci_controller *hose;
+
+ list_for_each_entry(hose, &hose_list, list_node)
+ if (hose->global_number == domain_nr)
+ return hose;
+
+ return NULL;
+}
+
+struct pci_intx_virq {
+ int virq;
+ struct kref kref;
+ struct list_head list_node;
+};
+
+static LIST_HEAD(intx_list);
+static DEFINE_MUTEX(intx_mutex);
+
+static void ppc_pci_intx_release(struct kref *kref)
+{
+ struct pci_intx_virq *vi = container_of(kref, struct pci_intx_virq, kref);
+
+ list_del(&vi->list_node);
+ irq_dispose_mapping(vi->virq);
+ kfree(vi);
+}
+
+static int ppc_pci_unmap_irq_line(struct notifier_block *nb,
+ unsigned long action, void *data)
+{
+ struct pci_dev *pdev = to_pci_dev(data);
+
+ if (action == BUS_NOTIFY_DEL_DEVICE) {
+ struct pci_intx_virq *vi;
+
+ mutex_lock(&intx_mutex);
+ list_for_each_entry(vi, &intx_list, list_node) {
+ if (vi->virq == pdev->irq) {
+ kref_put(&vi->kref, ppc_pci_intx_release);
+ break;
+ }
+ }
+ mutex_unlock(&intx_mutex);
+ }
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block ppc_pci_unmap_irq_notifier = {
+ .notifier_call = ppc_pci_unmap_irq_line,
+};
+
+static int ppc_pci_register_irq_notifier(void)
+{
+ return bus_register_notifier(&pci_bus_type, &ppc_pci_unmap_irq_notifier);
+}
+arch_initcall(ppc_pci_register_irq_notifier);
+
+/*
+ * Reads the interrupt pin to determine if interrupt is use by card.
+ * If the interrupt is used, then gets the interrupt line from the
+ * openfirmware and sets it in the pci_dev and pci_config line.
+ */
+static int pci_read_irq_line(struct pci_dev *pci_dev)
+{
+ int virq;
+ struct pci_intx_virq *vi, *vitmp;
+
+ /* Preallocate vi as rewind is complex if this fails after mapping */
+ vi = kzalloc(sizeof(struct pci_intx_virq), GFP_KERNEL);
+ if (!vi)
+ return -1;
+
+ pr_debug("PCI: Try to map irq for %s...\n", pci_name(pci_dev));
+
+ /* Try to get a mapping from the device-tree */
+ virq = of_irq_parse_and_map_pci(pci_dev, 0, 0);
+ if (virq <= 0) {
+ u8 line, pin;
+
+ /* If that fails, lets fallback to what is in the config
+ * space and map that through the default controller. We
+ * also set the type to level low since that's what PCI
+ * interrupts are. If your platform does differently, then
+ * either provide a proper interrupt tree or don't use this
+ * function.
+ */
+ if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_PIN, &pin))
+ goto error_exit;
+ if (pin == 0)
+ goto error_exit;
+ if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_LINE, &line) ||
+ line == 0xff || line == 0) {
+ goto error_exit;
+ }
+ pr_debug(" No map ! Using line %d (pin %d) from PCI config\n",
+ line, pin);
+
+ virq = irq_create_mapping(NULL, line);
+ if (virq)
+ irq_set_irq_type(virq, IRQ_TYPE_LEVEL_LOW);
+ }
+
+ if (!virq) {
+ pr_debug(" Failed to map !\n");
+ goto error_exit;
+ }
+
+ pr_debug(" Mapped to linux irq %d\n", virq);
+
+ pci_dev->irq = virq;
+
+ mutex_lock(&intx_mutex);
+ list_for_each_entry(vitmp, &intx_list, list_node) {
+ if (vitmp->virq == virq) {
+ kref_get(&vitmp->kref);
+ kfree(vi);
+ vi = NULL;
+ break;
+ }
+ }
+ if (vi) {
+ vi->virq = virq;
+ kref_init(&vi->kref);
+ list_add_tail(&vi->list_node, &intx_list);
+ }
+ mutex_unlock(&intx_mutex);
+
+ return 0;
+error_exit:
+ kfree(vi);
+ return -1;
+}
+
+/*
+ * Platform support for /proc/bus/pci/X/Y mmap()s.
+ * -- paulus.
+ */
+int pci_iobar_pfn(struct pci_dev *pdev, int bar, struct vm_area_struct *vma)
+{
+ struct pci_controller *hose = pci_bus_to_host(pdev->bus);
+ resource_size_t ioaddr = pci_resource_start(pdev, bar);
+
+ if (!hose)
+ return -EINVAL;
+
+ /* Convert to an offset within this PCI controller */
+ ioaddr -= (unsigned long)hose->io_base_virt - _IO_BASE;
+
+ vma->vm_pgoff += (ioaddr + hose->io_base_phys) >> PAGE_SHIFT;
+ return 0;
+}
+
+/*
+ * This one is used by /dev/mem and fbdev who have no clue about the
+ * PCI device, it tries to find the PCI device first and calls the
+ * above routine
+ */
+pgprot_t pci_phys_mem_access_prot(struct file *file,
+ unsigned long pfn,
+ unsigned long size,
+ pgprot_t prot)
+{
+ struct pci_dev *pdev = NULL;
+ struct resource *found = NULL;
+ resource_size_t offset = ((resource_size_t)pfn) << PAGE_SHIFT;
+ int i;
+
+ if (page_is_ram(pfn))
+ return prot;
+
+ prot = pgprot_noncached(prot);
+ for_each_pci_dev(pdev) {
+ for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
+ struct resource *rp = &pdev->resource[i];
+ int flags = rp->flags;
+
+ /* Active and same type? */
+ if ((flags & IORESOURCE_MEM) == 0)
+ continue;
+ /* In the range of this resource? */
+ if (offset < (rp->start & PAGE_MASK) ||
+ offset > rp->end)
+ continue;
+ found = rp;
+ break;
+ }
+ if (found)
+ break;
+ }
+ if (found) {
+ if (found->flags & IORESOURCE_PREFETCH)
+ prot = pgprot_noncached_wc(prot);
+ pci_dev_put(pdev);
+ }
+
+ pr_debug("PCI: Non-PCI map for %llx, prot: %lx\n",
+ (unsigned long long)offset, pgprot_val(prot));
+
+ return prot;
+}
+
+/* This provides legacy IO read access on a bus */
+int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val, size_t size)
+{
+ unsigned long offset;
+ struct pci_controller *hose = pci_bus_to_host(bus);
+ struct resource *rp = &hose->io_resource;
+ void __iomem *addr;
+
+ /* Check if port can be supported by that bus. We only check
+ * the ranges of the PHB though, not the bus itself as the rules
+ * for forwarding legacy cycles down bridges are not our problem
+ * here. So if the host bridge supports it, we do it.
+ */
+ offset = (unsigned long)hose->io_base_virt - _IO_BASE;
+ offset += port;
+
+ if (!(rp->flags & IORESOURCE_IO))
+ return -ENXIO;
+ if (offset < rp->start || (offset + size) > rp->end)
+ return -ENXIO;
+ addr = hose->io_base_virt + port;
+
+ switch(size) {
+ case 1:
+ *((u8 *)val) = in_8(addr);
+ return 1;
+ case 2:
+ if (port & 1)
+ return -EINVAL;
+ *((u16 *)val) = in_le16(addr);
+ return 2;
+ case 4:
+ if (port & 3)
+ return -EINVAL;
+ *((u32 *)val) = in_le32(addr);
+ return 4;
+ }
+ return -EINVAL;
+}
+
+/* This provides legacy IO write access on a bus */
+int pci_legacy_write(struct pci_bus *bus, loff_t port, u32 val, size_t size)
+{
+ unsigned long offset;
+ struct pci_controller *hose = pci_bus_to_host(bus);
+ struct resource *rp = &hose->io_resource;
+ void __iomem *addr;
+
+ /* Check if port can be supported by that bus. We only check
+ * the ranges of the PHB though, not the bus itself as the rules
+ * for forwarding legacy cycles down bridges are not our problem
+ * here. So if the host bridge supports it, we do it.
+ */
+ offset = (unsigned long)hose->io_base_virt - _IO_BASE;
+ offset += port;
+
+ if (!(rp->flags & IORESOURCE_IO))
+ return -ENXIO;
+ if (offset < rp->start || (offset + size) > rp->end)
+ return -ENXIO;
+ addr = hose->io_base_virt + port;
+
+ /* WARNING: The generic code is idiotic. It gets passed a pointer
+ * to what can be a 1, 2 or 4 byte quantity and always reads that
+ * as a u32, which means that we have to correct the location of
+ * the data read within those 32 bits for size 1 and 2
+ */
+ switch(size) {
+ case 1:
+ out_8(addr, val >> 24);
+ return 1;
+ case 2:
+ if (port & 1)
+ return -EINVAL;
+ out_le16(addr, val >> 16);
+ return 2;
+ case 4:
+ if (port & 3)
+ return -EINVAL;
+ out_le32(addr, val);
+ return 4;
+ }
+ return -EINVAL;
+}
+
+/* This provides legacy IO or memory mmap access on a bus */
+int pci_mmap_legacy_page_range(struct pci_bus *bus,
+ struct vm_area_struct *vma,
+ enum pci_mmap_state mmap_state)
+{
+ struct pci_controller *hose = pci_bus_to_host(bus);
+ resource_size_t offset =
+ ((resource_size_t)vma->vm_pgoff) << PAGE_SHIFT;
+ resource_size_t size = vma->vm_end - vma->vm_start;
+ struct resource *rp;
+
+ pr_debug("pci_mmap_legacy_page_range(%04x:%02x, %s @%llx..%llx)\n",
+ pci_domain_nr(bus), bus->number,
+ mmap_state == pci_mmap_mem ? "MEM" : "IO",
+ (unsigned long long)offset,
+ (unsigned long long)(offset + size - 1));
+
+ if (mmap_state == pci_mmap_mem) {
+ /* Hack alert !
+ *
+ * Because X is lame and can fail starting if it gets an error trying
+ * to mmap legacy_mem (instead of just moving on without legacy memory
+ * access) we fake it here by giving it anonymous memory, effectively
+ * behaving just like /dev/zero
+ */
+ if ((offset + size) > hose->isa_mem_size) {
+ printk(KERN_DEBUG
+ "Process %s (pid:%d) mapped non-existing PCI legacy memory for 0%04x:%02x\n",
+ current->comm, current->pid, pci_domain_nr(bus), bus->number);
+ if (vma->vm_flags & VM_SHARED)
+ return shmem_zero_setup(vma);
+ return 0;
+ }
+ offset += hose->isa_mem_phys;
+ } else {
+ unsigned long io_offset = (unsigned long)hose->io_base_virt - _IO_BASE;
+ unsigned long roffset = offset + io_offset;
+ rp = &hose->io_resource;
+ if (!(rp->flags & IORESOURCE_IO))
+ return -ENXIO;
+ if (roffset < rp->start || (roffset + size) > rp->end)
+ return -ENXIO;
+ offset += hose->io_base_phys;
+ }
+ pr_debug(" -> mapping phys %llx\n", (unsigned long long)offset);
+
+ vma->vm_pgoff = offset >> PAGE_SHIFT;
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
+ vma->vm_end - vma->vm_start,
+ vma->vm_page_prot);
+}
+
+void pci_resource_to_user(const struct pci_dev *dev, int bar,
+ const struct resource *rsrc,
+ resource_size_t *start, resource_size_t *end)
+{
+ struct pci_bus_region region;
+
+ if (rsrc->flags & IORESOURCE_IO) {
+ pcibios_resource_to_bus(dev->bus, &region,
+ (struct resource *) rsrc);
+ *start = region.start;
+ *end = region.end;
+ return;
+ }
+
+ /* We pass a CPU physical address to userland for MMIO instead of a
+ * BAR value because X is lame and expects to be able to use that
+ * to pass to /dev/mem!
+ *
+ * That means we may have 64-bit values where some apps only expect
+ * 32 (like X itself since it thinks only Sparc has 64-bit MMIO).
+ */
+ *start = rsrc->start;
+ *end = rsrc->end;
+}
+
+/**
+ * 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.
+ *
+ * - 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)
+{
+ int memno = 0;
+ struct resource *res;
+ struct of_pci_range range;
+ struct of_pci_range_parser parser;
+
+ printk(KERN_INFO "PCI host bridge %pOF %s ranges:\n",
+ dev, primary ? "(primary)" : "");
+
+ /* Check for ranges property */
+ if (of_pci_range_parser_init(&parser, dev))
+ return;
+
+ /* Parse it */
+ for_each_of_pci_range(&parser, &range) {
+ /* 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;
+ switch (range.flags & IORESOURCE_TYPE_BITS) {
+ case IORESOURCE_IO:
+ printk(KERN_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) {
+ printk(KERN_INFO
+ " \\--> Skipped (too many) !\n");
+ continue;
+ }
+#ifdef CONFIG_PPC32
+ /* 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 */
+ /* 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;
+ break;
+ case IORESOURCE_MEM:
+ printk(KERN_INFO
+ " MEM 0x%016llx..0x%016llx -> 0x%016llx %s\n",
+ range.cpu_addr, range.cpu_addr + range.size - 1,
+ range.pci_addr,
+ (range.flags & IORESOURCE_PREFETCH) ?
+ "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 (range.pci_addr == 0) {
+ 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;
+ }
+
+ /* Build resource */
+ hose->mem_offset[memno] = range.cpu_addr -
+ range.pci_addr;
+ res = &hose->mem_resources[memno++];
+ break;
+ }
+ if (res != NULL) {
+ res->name = dev->full_name;
+ res->flags = range.flags;
+ res->start = range.cpu_addr;
+ res->end = range.cpu_addr + range.size - 1;
+ res->parent = res->child = res->sibling = NULL;
+ }
+ }
+}
+
+/* Decide whether to display the domain number in /proc */
+int pci_proc_domain(struct pci_bus *bus)
+{
+ struct pci_controller *hose = pci_bus_to_host(bus);
+
+ if (!pci_has_flag(PCI_ENABLE_PROC_DOMAINS))
+ return 0;
+ if (pci_has_flag(PCI_COMPAT_DOMAIN_0))
+ return hose->global_number != 0;
+ return 1;
+}
+
+int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
+{
+ if (ppc_md.pcibios_root_bridge_prepare)
+ return ppc_md.pcibios_root_bridge_prepare(bridge);
+
+ return 0;
+}
+
+/* This header fixup will do the resource fixup for all devices as they are
+ * probed, but not for bridge ranges
+ */
+static void pcibios_fixup_resources(struct pci_dev *dev)
+{
+ struct pci_controller *hose = pci_bus_to_host(dev->bus);
+ int i;
+
+ if (!hose) {
+ printk(KERN_ERR "No host bridge for PCI dev %s !\n",
+ pci_name(dev));
+ return;
+ }
+
+ if (dev->is_virtfn)
+ return;
+
+ for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
+ struct resource *res = dev->resource + i;
+ struct pci_bus_region reg;
+ if (!res->flags)
+ continue;
+
+ /* If we're going to re-assign everything, we mark all resources
+ * as unset (and 0-base them). In addition, we mark BARs starting
+ * at 0 as unset as well, except if PCI_PROBE_ONLY is also set
+ * since in that case, we don't want to re-assign anything
+ */
+ pcibios_resource_to_bus(dev->bus, &reg, res);
+ if (pci_has_flag(PCI_REASSIGN_ALL_RSRC) ||
+ (reg.start == 0 && !pci_has_flag(PCI_PROBE_ONLY))) {
+ /* Only print message if not re-assigning */
+ if (!pci_has_flag(PCI_REASSIGN_ALL_RSRC))
+ pr_debug("PCI:%s Resource %d %pR is unassigned\n",
+ pci_name(dev), i, res);
+ res->end -= res->start;
+ res->start = 0;
+ res->flags |= IORESOURCE_UNSET;
+ continue;
+ }
+
+ pr_debug("PCI:%s Resource %d %pR\n", pci_name(dev), i, res);
+ }
+
+ /* Call machine specific resource fixup */
+ if (ppc_md.pcibios_fixup_resources)
+ ppc_md.pcibios_fixup_resources(dev);
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_resources);
+
+/* This function tries to figure out if a bridge resource has been initialized
+ * by the firmware or not. It doesn't have to be absolutely bullet proof, but
+ * things go more smoothly when it gets it right. It should covers cases such
+ * as Apple "closed" bridge resources and bare-metal pSeries unassigned bridges
+ */
+static int pcibios_uninitialized_bridge_resource(struct pci_bus *bus,
+ struct resource *res)
+{
+ struct pci_controller *hose = pci_bus_to_host(bus);
+ struct pci_dev *dev = bus->self;
+ resource_size_t offset;
+ struct pci_bus_region region;
+ u16 command;
+ int i;
+
+ /* We don't do anything if PCI_PROBE_ONLY is set */
+ if (pci_has_flag(PCI_PROBE_ONLY))
+ return 0;
+
+ /* Job is a bit different between memory and IO */
+ if (res->flags & IORESOURCE_MEM) {
+ pcibios_resource_to_bus(dev->bus, &region, res);
+
+ /* If the BAR is non-0 then it's probably been initialized */
+ if (region.start != 0)
+ return 0;
+
+ /* The BAR is 0, let's check if memory decoding is enabled on
+ * the bridge. If not, we consider it unassigned
+ */
+ pci_read_config_word(dev, PCI_COMMAND, &command);
+ if ((command & PCI_COMMAND_MEMORY) == 0)
+ return 1;
+
+ /* Memory decoding is enabled and the BAR is 0. If any of the bridge
+ * resources covers that starting address (0 then it's good enough for
+ * us for memory space)
+ */
+ for (i = 0; i < 3; i++) {
+ if ((hose->mem_resources[i].flags & IORESOURCE_MEM) &&
+ hose->mem_resources[i].start == hose->mem_offset[i])
+ return 0;
+ }
+
+ /* Well, it starts at 0 and we know it will collide so we may as
+ * well consider it as unassigned. That covers the Apple case.
+ */
+ return 1;
+ } else {
+ /* If the BAR is non-0, then we consider it assigned */
+ offset = (unsigned long)hose->io_base_virt - _IO_BASE;
+ if (((res->start - offset) & 0xfffffffful) != 0)
+ return 0;
+
+ /* Here, we are a bit different than memory as typically IO space
+ * starting at low addresses -is- valid. What we do instead if that
+ * we consider as unassigned anything that doesn't have IO enabled
+ * in the PCI command register, and that's it.
+ */
+ pci_read_config_word(dev, PCI_COMMAND, &command);
+ if (command & PCI_COMMAND_IO)
+ return 0;
+
+ /* It's starting at 0 and IO is disabled in the bridge, consider
+ * it unassigned
+ */
+ return 1;
+ }
+}
+
+/* Fixup resources of a PCI<->PCI bridge */
+static void pcibios_fixup_bridge(struct pci_bus *bus)
+{
+ struct resource *res;
+ int i;
+
+ struct pci_dev *dev = bus->self;
+
+ pci_bus_for_each_resource(bus, res, i) {
+ if (!res || !res->flags)
+ continue;
+ if (i >= 3 && bus->self->transparent)
+ continue;
+
+ /* If we're going to reassign everything, we can
+ * shrink the P2P resource to have size as being
+ * of 0 in order to save space.
+ */
+ if (pci_has_flag(PCI_REASSIGN_ALL_RSRC)) {
+ res->flags |= IORESOURCE_UNSET;
+ res->start = 0;
+ res->end = -1;
+ continue;
+ }
+
+ pr_debug("PCI:%s Bus rsrc %d %pR\n", pci_name(dev), i, res);
+
+ /* Try to detect uninitialized P2P bridge resources,
+ * and clear them out so they get re-assigned later
+ */
+ if (pcibios_uninitialized_bridge_resource(bus, res)) {
+ res->flags = 0;
+ pr_debug("PCI:%s (unassigned)\n", pci_name(dev));
+ }
+ }
+}
+
+void pcibios_setup_bus_self(struct pci_bus *bus)
+{
+ struct pci_controller *phb;
+
+ /* Fix up the bus resources for P2P bridges */
+ if (bus->self != NULL)
+ pcibios_fixup_bridge(bus);
+
+ /* Platform specific bus fixups. This is currently only used
+ * by fsl_pci and I'm hoping to get rid of it at some point
+ */
+ if (ppc_md.pcibios_fixup_bus)
+ ppc_md.pcibios_fixup_bus(bus);
+
+ /* Setup bus DMA mappings */
+ phb = pci_bus_to_host(bus);
+ if (phb->controller_ops.dma_bus_setup)
+ phb->controller_ops.dma_bus_setup(bus);
+}
+
+void pcibios_bus_add_device(struct pci_dev *dev)
+{
+ struct pci_controller *phb;
+ /* Fixup NUMA node as it may not be setup yet by the generic
+ * code and is needed by the DMA init
+ */
+ set_dev_node(&dev->dev, pcibus_to_node(dev->bus));
+
+ /* Hook up default DMA ops */
+ set_dma_ops(&dev->dev, pci_dma_ops);
+ dev->dev.archdata.dma_offset = PCI_DRAM_OFFSET;
+
+ /* Additional platform DMA/iommu setup */
+ phb = pci_bus_to_host(dev->bus);
+ if (phb->controller_ops.dma_dev_setup)
+ phb->controller_ops.dma_dev_setup(dev);
+
+ /* Read default IRQs and fixup if necessary */
+ pci_read_irq_line(dev);
+ if (ppc_md.pci_irq_fixup)
+ ppc_md.pci_irq_fixup(dev);
+
+ if (ppc_md.pcibios_bus_add_device)
+ ppc_md.pcibios_bus_add_device(dev);
+}
+
+int pcibios_device_add(struct pci_dev *dev)
+{
+ struct irq_domain *d;
+
+#ifdef CONFIG_PCI_IOV
+ if (ppc_md.pcibios_fixup_sriov)
+ ppc_md.pcibios_fixup_sriov(dev);
+#endif /* CONFIG_PCI_IOV */
+
+ d = dev_get_msi_domain(&dev->bus->dev);
+ if (d)
+ dev_set_msi_domain(&dev->dev, d);
+ return 0;
+}
+
+void pcibios_set_master(struct pci_dev *dev)
+{
+ /* No special bus mastering setup handling */
+}
+
+void pcibios_fixup_bus(struct pci_bus *bus)
+{
+ /* When called from the generic PCI probe, read PCI<->PCI bridge
+ * bases. This is -not- called when generating the PCI tree from
+ * the OF device-tree.
+ */
+ pci_read_bridge_bases(bus);
+
+ /* Now fixup the bus */
+ pcibios_setup_bus_self(bus);
+}
+EXPORT_SYMBOL(pcibios_fixup_bus);
+
+static int skip_isa_ioresource_align(struct pci_dev *dev)
+{
+ if (pci_has_flag(PCI_CAN_SKIP_ISA_ALIGN) &&
+ !(dev->bus->bridge_ctl & PCI_BRIDGE_CTL_ISA))
+ return 1;
+ return 0;
+}
+
+/*
+ * We need to avoid collisions with `mirrored' VGA ports
+ * and other strange ISA hardware, so we always want the
+ * addresses to be allocated in the 0x000-0x0ff region
+ * modulo 0x400.
+ *
+ * Why? Because some silly external IO cards only decode
+ * the low 10 bits of the IO address. The 0x00-0xff region
+ * is reserved for motherboard devices that decode all 16
+ * bits, so it's ok to allocate at, say, 0x2800-0x28ff,
+ * but we want to try to avoid allocating at 0x2900-0x2bff
+ * which might have be mirrored at 0x0100-0x03ff..
+ */
+resource_size_t pcibios_align_resource(void *data, const struct resource *res,
+ resource_size_t size, resource_size_t align)
+{
+ struct pci_dev *dev = data;
+ resource_size_t start = res->start;
+
+ if (res->flags & IORESOURCE_IO) {
+ if (skip_isa_ioresource_align(dev))
+ return start;
+ if (start & 0x300)
+ start = (start + 0x3ff) & ~0x3ff;
+ }
+
+ return start;
+}
+EXPORT_SYMBOL(pcibios_align_resource);
+
+/*
+ * Reparent resource children of pr that conflict with res
+ * under res, and make res replace those children.
+ */
+static int reparent_resources(struct resource *parent,
+ struct resource *res)
+{
+ struct resource *p, **pp;
+ struct resource **firstpp = NULL;
+
+ for (pp = &parent->child; (p = *pp) != NULL; pp = &p->sibling) {
+ if (p->end < res->start)
+ continue;
+ if (res->end < p->start)
+ break;
+ if (p->start < res->start || p->end > res->end)
+ return -1; /* not completely contained */
+ if (firstpp == NULL)
+ firstpp = pp;
+ }
+ if (firstpp == NULL)
+ return -1; /* didn't find any conflicting entries? */
+ res->parent = parent;
+ res->child = *firstpp;
+ res->sibling = *pp;
+ *firstpp = res;
+ *pp = NULL;
+ for (p = res->child; p != NULL; p = p->sibling) {
+ p->parent = res;
+ pr_debug("PCI: Reparented %s %pR under %s\n",
+ p->name, p, res->name);
+ }
+ return 0;
+}
+
+/*
+ * Handle resources of PCI devices. If the world were perfect, we could
+ * just allocate all the resource regions and do nothing more. It isn't.
+ * On the other hand, we cannot just re-allocate all devices, as it would
+ * require us to know lots of host bridge internals. So we attempt to
+ * keep as much of the original configuration as possible, but tweak it
+ * when it's found to be wrong.
+ *
+ * Known BIOS problems we have to work around:
+ * - I/O or memory regions not configured
+ * - regions configured, but not enabled in the command register
+ * - bogus I/O addresses above 64K used
+ * - expansion ROMs left enabled (this may sound harmless, but given
+ * the fact the PCI specs explicitly allow address decoders to be
+ * shared between expansion ROMs and other resource regions, it's
+ * at least dangerous)
+ *
+ * Our solution:
+ * (1) Allocate resources for all buses behind PCI-to-PCI bridges.
+ * This gives us fixed barriers on where we can allocate.
+ * (2) Allocate resources for all enabled devices. If there is
+ * a collision, just mark the resource as unallocated. Also
+ * disable expansion ROMs during this step.
+ * (3) Try to allocate resources for disabled devices. If the
+ * resources were assigned correctly, everything goes well,
+ * if they weren't, they won't disturb allocation of other
+ * resources.
+ * (4) Assign new addresses to resources which were either
+ * not configured at all or misconfigured. If explicitly
+ * requested by the user, configure expansion ROM address
+ * as well.
+ */
+
+static void pcibios_allocate_bus_resources(struct pci_bus *bus)
+{
+ struct pci_bus *b;
+ int i;
+ struct resource *res, *pr;
+
+ pr_debug("PCI: Allocating bus resources for %04x:%02x...\n",
+ pci_domain_nr(bus), bus->number);
+
+ pci_bus_for_each_resource(bus, res, i) {
+ if (!res || !res->flags || res->start > res->end || res->parent)
+ continue;
+
+ /* If the resource was left unset at this point, we clear it */
+ if (res->flags & IORESOURCE_UNSET)
+ goto clear_resource;
+
+ if (bus->parent == NULL)
+ pr = (res->flags & IORESOURCE_IO) ?
+ &ioport_resource : &iomem_resource;
+ else {
+ pr = pci_find_parent_resource(bus->self, res);
+ if (pr == res) {
+ /* this happens when the generic PCI
+ * code (wrongly) decides that this
+ * bridge is transparent -- paulus
+ */
+ continue;
+ }
+ }
+
+ pr_debug("PCI: %s (bus %d) bridge rsrc %d: %pR, parent %p (%s)\n",
+ bus->self ? pci_name(bus->self) : "PHB", bus->number,
+ i, res, pr, (pr && pr->name) ? pr->name : "nil");
+
+ if (pr && !(pr->flags & IORESOURCE_UNSET)) {
+ struct pci_dev *dev = bus->self;
+
+ if (request_resource(pr, res) == 0)
+ continue;
+ /*
+ * Must be a conflict with an existing entry.
+ * Move that entry (or entries) under the
+ * bridge resource and try again.
+ */
+ if (reparent_resources(pr, res) == 0)
+ continue;
+
+ if (dev && i < PCI_BRIDGE_RESOURCE_NUM &&
+ pci_claim_bridge_resource(dev,
+ i + PCI_BRIDGE_RESOURCES) == 0)
+ continue;
+ }
+ pr_warn("PCI: Cannot allocate resource region %d of PCI bridge %d, will remap\n",
+ i, bus->number);
+ clear_resource:
+ /* The resource might be figured out when doing
+ * reassignment based on the resources required
+ * by the downstream PCI devices. Here we set
+ * the size of the resource to be 0 in order to
+ * save more space.
+ */
+ res->start = 0;
+ res->end = -1;
+ res->flags = 0;
+ }
+
+ list_for_each_entry(b, &bus->children, node)
+ pcibios_allocate_bus_resources(b);
+}
+
+static inline void alloc_resource(struct pci_dev *dev, int idx)
+{
+ struct resource *pr, *r = &dev->resource[idx];
+
+ pr_debug("PCI: Allocating %s: Resource %d: %pR\n",
+ pci_name(dev), idx, r);
+
+ pr = pci_find_parent_resource(dev, r);
+ if (!pr || (pr->flags & IORESOURCE_UNSET) ||
+ request_resource(pr, r) < 0) {
+ printk(KERN_WARNING "PCI: Cannot allocate resource region %d"
+ " of device %s, will remap\n", idx, pci_name(dev));
+ if (pr)
+ pr_debug("PCI: parent is %p: %pR\n", pr, pr);
+ /* We'll assign a new address later */
+ r->flags |= IORESOURCE_UNSET;
+ r->end -= r->start;
+ r->start = 0;
+ }
+}
+
+static void __init pcibios_allocate_resources(int pass)
+{
+ struct pci_dev *dev = NULL;
+ int idx, disabled;
+ u16 command;
+ struct resource *r;
+
+ for_each_pci_dev(dev) {
+ pci_read_config_word(dev, PCI_COMMAND, &command);
+ for (idx = 0; idx <= PCI_ROM_RESOURCE; idx++) {
+ r = &dev->resource[idx];
+ if (r->parent) /* Already allocated */
+ continue;
+ if (!r->flags || (r->flags & IORESOURCE_UNSET))
+ continue; /* Not assigned at all */
+ /* We only allocate ROMs on pass 1 just in case they
+ * have been screwed up by firmware
+ */
+ if (idx == PCI_ROM_RESOURCE )
+ disabled = 1;
+ if (r->flags & IORESOURCE_IO)
+ disabled = !(command & PCI_COMMAND_IO);
+ else
+ disabled = !(command & PCI_COMMAND_MEMORY);
+ if (pass == disabled)
+ alloc_resource(dev, idx);
+ }
+ if (pass)
+ continue;
+ r = &dev->resource[PCI_ROM_RESOURCE];
+ if (r->flags) {
+ /* Turn the ROM off, leave the resource region,
+ * but keep it unregistered.
+ */
+ u32 reg;
+ pci_read_config_dword(dev, dev->rom_base_reg, &reg);
+ if (reg & PCI_ROM_ADDRESS_ENABLE) {
+ pr_debug("PCI: Switching off ROM of %s\n",
+ pci_name(dev));
+ r->flags &= ~IORESOURCE_ROM_ENABLE;
+ pci_write_config_dword(dev, dev->rom_base_reg,
+ reg & ~PCI_ROM_ADDRESS_ENABLE);
+ }
+ }
+ }
+}
+
+static void __init pcibios_reserve_legacy_regions(struct pci_bus *bus)
+{
+ struct pci_controller *hose = pci_bus_to_host(bus);
+ resource_size_t offset;
+ struct resource *res, *pres;
+ int i;
+
+ pr_debug("Reserving legacy ranges for domain %04x\n", pci_domain_nr(bus));
+
+ /* Check for IO */
+ if (!(hose->io_resource.flags & IORESOURCE_IO))
+ goto no_io;
+ offset = (unsigned long)hose->io_base_virt - _IO_BASE;
+ res = kzalloc(sizeof(struct resource), GFP_KERNEL);
+ BUG_ON(res == NULL);
+ res->name = "Legacy IO";
+ res->flags = IORESOURCE_IO;
+ res->start = offset;
+ res->end = (offset + 0xfff) & 0xfffffffful;
+ pr_debug("Candidate legacy IO: %pR\n", res);
+ if (request_resource(&hose->io_resource, res)) {
+ printk(KERN_DEBUG
+ "PCI %04x:%02x Cannot reserve Legacy IO %pR\n",
+ pci_domain_nr(bus), bus->number, res);
+ kfree(res);
+ }
+
+ no_io:
+ /* Check for memory */
+ for (i = 0; i < 3; i++) {
+ pres = &hose->mem_resources[i];
+ offset = hose->mem_offset[i];
+ if (!(pres->flags & IORESOURCE_MEM))
+ continue;
+ pr_debug("hose mem res: %pR\n", pres);
+ if ((pres->start - offset) <= 0xa0000 &&
+ (pres->end - offset) >= 0xbffff)
+ break;
+ }
+ if (i >= 3)
+ return;
+ res = kzalloc(sizeof(struct resource), GFP_KERNEL);
+ BUG_ON(res == NULL);
+ res->name = "Legacy VGA memory";
+ res->flags = IORESOURCE_MEM;
+ res->start = 0xa0000 + offset;
+ res->end = 0xbffff + offset;
+ pr_debug("Candidate VGA memory: %pR\n", res);
+ if (request_resource(pres, res)) {
+ printk(KERN_DEBUG
+ "PCI %04x:%02x Cannot reserve VGA memory %pR\n",
+ pci_domain_nr(bus), bus->number, res);
+ kfree(res);
+ }
+}
+
+void __init pcibios_resource_survey(void)
+{
+ struct pci_bus *b;
+
+ /* Allocate and assign resources */
+ list_for_each_entry(b, &pci_root_buses, node)
+ pcibios_allocate_bus_resources(b);
+ if (!pci_has_flag(PCI_REASSIGN_ALL_RSRC)) {
+ pcibios_allocate_resources(0);
+ pcibios_allocate_resources(1);
+ }
+
+ /* Before we start assigning unassigned resource, we try to reserve
+ * the low IO area and the VGA memory area if they intersect the
+ * bus available resources to avoid allocating things on top of them
+ */
+ if (!pci_has_flag(PCI_PROBE_ONLY)) {
+ list_for_each_entry(b, &pci_root_buses, node)
+ pcibios_reserve_legacy_regions(b);
+ }
+
+ /* Now, if the platform didn't decide to blindly trust the firmware,
+ * we proceed to assigning things that were left unassigned
+ */
+ if (!pci_has_flag(PCI_PROBE_ONLY)) {
+ pr_debug("PCI: Assigning unassigned resources...\n");
+ pci_assign_unassigned_resources();
+ }
+}
+
+/* This is used by the PCI hotplug driver to allocate resource
+ * of newly plugged busses. We can try to consolidate with the
+ * rest of the code later, for now, keep it as-is as our main
+ * resource allocation function doesn't deal with sub-trees yet.
+ */
+void pcibios_claim_one_bus(struct pci_bus *bus)
+{
+ struct pci_dev *dev;
+ struct pci_bus *child_bus;
+
+ list_for_each_entry(dev, &bus->devices, bus_list) {
+ int i;
+
+ for (i = 0; i < PCI_NUM_RESOURCES; i++) {
+ struct resource *r = &dev->resource[i];
+
+ if (r->parent || !r->start || !r->flags)
+ continue;
+
+ pr_debug("PCI: Claiming %s: Resource %d: %pR\n",
+ pci_name(dev), i, r);
+
+ if (pci_claim_resource(dev, i) == 0)
+ continue;
+
+ pci_claim_bridge_resource(dev, i);
+ }
+ }
+
+ list_for_each_entry(child_bus, &bus->children, node)
+ pcibios_claim_one_bus(child_bus);
+}
+EXPORT_SYMBOL_GPL(pcibios_claim_one_bus);
+
+
+/* pcibios_finish_adding_to_bus
+ *
+ * This is to be called by the hotplug code after devices have been
+ * added to a bus, this include calling it for a PHB that is just
+ * being added
+ */
+void pcibios_finish_adding_to_bus(struct pci_bus *bus)
+{
+ pr_debug("PCI: Finishing adding to hotplug bus %04x:%02x\n",
+ pci_domain_nr(bus), bus->number);
+
+ /* Allocate bus and devices resources */
+ pcibios_allocate_bus_resources(bus);
+ pcibios_claim_one_bus(bus);
+ if (!pci_has_flag(PCI_PROBE_ONLY)) {
+ if (bus->self)
+ pci_assign_unassigned_bridge_resources(bus->self);
+ else
+ pci_assign_unassigned_bus_resources(bus);
+ }
+
+ /* Add new devices to global lists. Register in proc, sysfs. */
+ pci_bus_add_devices(bus);
+}
+EXPORT_SYMBOL_GPL(pcibios_finish_adding_to_bus);
+
+int pcibios_enable_device(struct pci_dev *dev, int mask)
+{
+ struct pci_controller *phb = pci_bus_to_host(dev->bus);
+
+ if (phb->controller_ops.enable_device_hook)
+ if (!phb->controller_ops.enable_device_hook(dev))
+ return -EINVAL;
+
+ return pci_enable_resources(dev, mask);
+}
+
+void pcibios_disable_device(struct pci_dev *dev)
+{
+ struct pci_controller *phb = pci_bus_to_host(dev->bus);
+
+ if (phb->controller_ops.disable_device)
+ phb->controller_ops.disable_device(dev);
+}
+
+resource_size_t pcibios_io_space_offset(struct pci_controller *hose)
+{
+ return (unsigned long) hose->io_base_virt - _IO_BASE;
+}
+
+static void pcibios_setup_phb_resources(struct pci_controller *hose,
+ struct list_head *resources)
+{
+ struct resource *res;
+ resource_size_t offset;
+ int i;
+
+ /* Hookup PHB IO resource */
+ res = &hose->io_resource;
+
+ if (!res->flags) {
+ pr_debug("PCI: I/O resource not set for host"
+ " bridge %pOF (domain %d)\n",
+ hose->dn, hose->global_number);
+ } else {
+ offset = pcibios_io_space_offset(hose);
+
+ pr_debug("PCI: PHB IO resource = %pR off 0x%08llx\n",
+ res, (unsigned long long)offset);
+ pci_add_resource_offset(resources, res, offset);
+ }
+
+ /* Hookup PHB Memory resources */
+ for (i = 0; i < 3; ++i) {
+ res = &hose->mem_resources[i];
+ if (!res->flags)
+ continue;
+
+ offset = hose->mem_offset[i];
+ pr_debug("PCI: PHB MEM resource %d = %pR off 0x%08llx\n", i,
+ res, (unsigned long long)offset);
+
+ pci_add_resource_offset(resources, res, offset);
+ }
+}
+
+/*
+ * Null PCI config access functions, for the case when we can't
+ * find a hose.
+ */
+#define NULL_PCI_OP(rw, size, type) \
+static int \
+null_##rw##_config_##size(struct pci_dev *dev, int offset, type val) \
+{ \
+ return PCIBIOS_DEVICE_NOT_FOUND; \
+}
+
+static int
+null_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
+ int len, u32 *val)
+{
+ return PCIBIOS_DEVICE_NOT_FOUND;
+}
+
+static int
+null_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
+ int len, u32 val)
+{
+ return PCIBIOS_DEVICE_NOT_FOUND;
+}
+
+static struct pci_ops null_pci_ops =
+{
+ .read = null_read_config,
+ .write = null_write_config,
+};
+
+/*
+ * These functions are used early on before PCI scanning is done
+ * and all of the pci_dev and pci_bus structures have been created.
+ */
+static struct pci_bus *
+fake_pci_bus(struct pci_controller *hose, int busnr)
+{
+ static struct pci_bus bus;
+
+ if (hose == NULL) {
+ printk(KERN_ERR "Can't find hose for PCI bus %d!\n", busnr);
+ }
+ bus.number = busnr;
+ bus.sysdata = hose;
+ bus.ops = hose? hose->ops: &null_pci_ops;
+ return &bus;
+}
+
+#define EARLY_PCI_OP(rw, size, type) \
+int early_##rw##_config_##size(struct pci_controller *hose, int bus, \
+ int devfn, int offset, type value) \
+{ \
+ return pci_bus_##rw##_config_##size(fake_pci_bus(hose, bus), \
+ devfn, offset, value); \
+}
+
+EARLY_PCI_OP(read, byte, u8 *)
+EARLY_PCI_OP(read, word, u16 *)
+EARLY_PCI_OP(read, dword, u32 *)
+EARLY_PCI_OP(write, byte, u8)
+EARLY_PCI_OP(write, word, u16)
+EARLY_PCI_OP(write, dword, u32)
+
+int early_find_capability(struct pci_controller *hose, int bus, int devfn,
+ int cap)
+{
+ return pci_bus_find_capability(fake_pci_bus(hose, bus), devfn, cap);
+}
+
+struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
+{
+ struct pci_controller *hose = bus->sysdata;
+
+ return of_node_get(hose->dn);
+}
+
+/**
+ * pci_scan_phb - Given a pci_controller, setup and scan the PCI bus
+ * @hose: Pointer to the PCI host controller instance structure
+ */
+void pcibios_scan_phb(struct pci_controller *hose)
+{
+ LIST_HEAD(resources);
+ struct pci_bus *bus;
+ struct device_node *node = hose->dn;
+ int mode;
+
+ pr_debug("PCI: Scanning PHB %pOF\n", node);
+
+ /* Get some IO space for the new PHB */
+ pcibios_setup_phb_io_space(hose);
+
+ /* Wire up PHB bus resources */
+ pcibios_setup_phb_resources(hose, &resources);
+
+ hose->busn.start = hose->first_busno;
+ hose->busn.end = hose->last_busno;
+ hose->busn.flags = IORESOURCE_BUS;
+ pci_add_resource(&resources, &hose->busn);
+
+ /* Create an empty bus for the toplevel */
+ bus = pci_create_root_bus(hose->parent, hose->first_busno,
+ hose->ops, hose, &resources);
+ if (bus == NULL) {
+ pr_err("Failed to create bus for PCI domain %04x\n",
+ hose->global_number);
+ pci_free_resource_list(&resources);
+ return;
+ }
+ hose->bus = bus;
+
+ /* Get probe mode and perform scan */
+ mode = PCI_PROBE_NORMAL;
+ if (node && hose->controller_ops.probe_mode)
+ mode = hose->controller_ops.probe_mode(bus);
+ pr_debug(" probe mode: %d\n", mode);
+ if (mode == PCI_PROBE_DEVTREE)
+ of_scan_bus(node, bus);
+
+ if (mode == PCI_PROBE_NORMAL) {
+ pci_bus_update_busn_res_end(bus, 255);
+ hose->last_busno = pci_scan_child_bus(bus);
+ pci_bus_update_busn_res_end(bus, hose->last_busno);
+ }
+
+ /* Platform gets a chance to do some global fixups before
+ * we proceed to resource allocation
+ */
+ if (ppc_md.pcibios_fixup_phb)
+ ppc_md.pcibios_fixup_phb(hose);
+
+ /* Configure PCI Express settings */
+ if (bus && !pci_has_flag(PCI_PROBE_ONLY)) {
+ struct pci_bus *child;
+ list_for_each_entry(child, &bus->children, node)
+ pcie_bus_configure_settings(child);
+ }
+}
+EXPORT_SYMBOL_GPL(pcibios_scan_phb);
+
+static void fixup_hide_host_resource_fsl(struct pci_dev *dev)
+{
+ int i, class = dev->class >> 8;
+ /* When configured as agent, programming interface = 1 */
+ int prog_if = dev->class & 0xf;
+
+ if ((class == PCI_CLASS_PROCESSOR_POWERPC ||
+ class == PCI_CLASS_BRIDGE_OTHER) &&
+ (dev->hdr_type == PCI_HEADER_TYPE_NORMAL) &&
+ (prog_if == 0) &&
+ (dev->bus->parent == NULL)) {
+ for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
+ dev->resource[i].start = 0;
+ dev->resource[i].end = 0;
+ dev->resource[i].flags = 0;
+ }
+ }
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MOTOROLA, PCI_ANY_ID, fixup_hide_host_resource_fsl);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, fixup_hide_host_resource_fsl);
+
+
+static int __init discover_phbs(void)
+{
+ if (ppc_md.discover_phbs)
+ ppc_md.discover_phbs();
+
+ return 0;
+}
+core_initcall(discover_phbs);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-19 00:45:43 +0000