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-rw-r--r--arch/alpha/kernel/pci.c476
1 files changed, 476 insertions, 0 deletions
diff --git a/arch/alpha/kernel/pci.c b/arch/alpha/kernel/pci.c
new file mode 100644
index 000000000..64fbfb076
--- /dev/null
+++ b/arch/alpha/kernel/pci.c
@@ -0,0 +1,476 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/arch/alpha/kernel/pci.c
+ *
+ * Extruded from code written by
+ * Dave Rusling (david.rusling@reo.mts.dec.com)
+ * David Mosberger (davidm@cs.arizona.edu)
+ */
+
+/* 2.3.x PCI/resources, 1999 Andrea Arcangeli <andrea@suse.de> */
+
+/*
+ * Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
+ * PCI-PCI bridges cleanup
+ */
+#include <linux/string.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/memblock.h>
+#include <linux/module.h>
+#include <linux/cache.h>
+#include <linux/slab.h>
+#include <linux/syscalls.h>
+#include <asm/machvec.h>
+
+#include "proto.h"
+#include "pci_impl.h"
+
+
+/*
+ * Some string constants used by the various core logics.
+ */
+
+const char *const pci_io_names[] = {
+ "PCI IO bus 0", "PCI IO bus 1", "PCI IO bus 2", "PCI IO bus 3",
+ "PCI IO bus 4", "PCI IO bus 5", "PCI IO bus 6", "PCI IO bus 7"
+};
+
+const char *const pci_mem_names[] = {
+ "PCI mem bus 0", "PCI mem bus 1", "PCI mem bus 2", "PCI mem bus 3",
+ "PCI mem bus 4", "PCI mem bus 5", "PCI mem bus 6", "PCI mem bus 7"
+};
+
+const char pci_hae0_name[] = "HAE0";
+
+/*
+ * If PCI_PROBE_ONLY in pci_flags is set, we don't change any PCI resource
+ * assignments.
+ */
+
+/*
+ * The PCI controller list.
+ */
+
+struct pci_controller *hose_head, **hose_tail = &hose_head;
+struct pci_controller *pci_isa_hose;
+
+/*
+ * Quirks.
+ */
+
+static void quirk_isa_bridge(struct pci_dev *dev)
+{
+ dev->class = PCI_CLASS_BRIDGE_ISA << 8;
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82378, quirk_isa_bridge);
+
+static void quirk_cypress(struct pci_dev *dev)
+{
+ /* The Notorious Cy82C693 chip. */
+
+ /* The generic legacy mode IDE fixup in drivers/pci/probe.c
+ doesn't work correctly with the Cypress IDE controller as
+ it has non-standard register layout. Fix that. */
+ if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE) {
+ dev->resource[2].start = dev->resource[3].start = 0;
+ dev->resource[2].end = dev->resource[3].end = 0;
+ dev->resource[2].flags = dev->resource[3].flags = 0;
+ if (PCI_FUNC(dev->devfn) == 2) {
+ dev->resource[0].start = 0x170;
+ dev->resource[0].end = 0x177;
+ dev->resource[1].start = 0x376;
+ dev->resource[1].end = 0x376;
+ }
+ }
+
+ /* The Cypress bridge responds on the PCI bus in the address range
+ 0xffff0000-0xffffffff (conventional x86 BIOS ROM). There is no
+ way to turn this off. The bridge also supports several extended
+ BIOS ranges (disabled after power-up), and some consoles do turn
+ them on. So if we use a large direct-map window, or a large SG
+ window, we must avoid the entire 0xfff00000-0xffffffff region. */
+ if (dev->class >> 8 == PCI_CLASS_BRIDGE_ISA) {
+ if (__direct_map_base + __direct_map_size >= 0xfff00000UL)
+ __direct_map_size = 0xfff00000UL - __direct_map_base;
+ else {
+ struct pci_controller *hose = dev->sysdata;
+ struct pci_iommu_arena *pci = hose->sg_pci;
+ if (pci && pci->dma_base + pci->size >= 0xfff00000UL)
+ pci->size = 0xfff00000UL - pci->dma_base;
+ }
+ }
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693, quirk_cypress);
+
+/* Called for each device after PCI setup is done. */
+static void pcibios_fixup_final(struct pci_dev *dev)
+{
+ unsigned int class = dev->class >> 8;
+
+ if (class == PCI_CLASS_BRIDGE_ISA || class == PCI_CLASS_BRIDGE_EISA) {
+ dev->dma_mask = MAX_ISA_DMA_ADDRESS - 1;
+ isa_bridge = dev;
+ }
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_final);
+
+/* Just declaring that the power-of-ten prefixes are actually the
+ power-of-two ones doesn't make it true :) */
+#define KB 1024
+#define MB (1024*KB)
+#define GB (1024*MB)
+
+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;
+ struct pci_controller *hose = dev->sysdata;
+ unsigned long alignto;
+ resource_size_t start = res->start;
+
+ if (res->flags & IORESOURCE_IO) {
+ /* Make sure we start at our min on all hoses */
+ if (start - hose->io_space->start < PCIBIOS_MIN_IO)
+ start = PCIBIOS_MIN_IO + hose->io_space->start;
+
+ /*
+ * Put everything into 0x00-0xff region modulo 0x400
+ */
+ if (start & 0x300)
+ start = (start + 0x3ff) & ~0x3ff;
+ }
+ else if (res->flags & IORESOURCE_MEM) {
+ /* Make sure we start at our min on all hoses */
+ if (start - hose->mem_space->start < PCIBIOS_MIN_MEM)
+ start = PCIBIOS_MIN_MEM + hose->mem_space->start;
+
+ /*
+ * The following holds at least for the Low Cost
+ * Alpha implementation of the PCI interface:
+ *
+ * In sparse memory address space, the first
+ * octant (16MB) of every 128MB segment is
+ * aliased to the very first 16 MB of the
+ * address space (i.e., it aliases the ISA
+ * memory address space). Thus, we try to
+ * avoid allocating PCI devices in that range.
+ * Can be allocated in 2nd-7th octant only.
+ * Devices that need more than 112MB of
+ * address space must be accessed through
+ * dense memory space only!
+ */
+
+ /* Align to multiple of size of minimum base. */
+ alignto = max_t(resource_size_t, 0x1000, align);
+ start = ALIGN(start, alignto);
+ if (hose->sparse_mem_base && size <= 7 * 16*MB) {
+ if (((start / (16*MB)) & 0x7) == 0) {
+ start &= ~(128*MB - 1);
+ start += 16*MB;
+ start = ALIGN(start, alignto);
+ }
+ if (start/(128*MB) != (start + size - 1)/(128*MB)) {
+ start &= ~(128*MB - 1);
+ start += (128 + 16)*MB;
+ start = ALIGN(start, alignto);
+ }
+ }
+ }
+
+ return start;
+}
+#undef KB
+#undef MB
+#undef GB
+
+static int __init
+pcibios_init(void)
+{
+ if (alpha_mv.init_pci)
+ alpha_mv.init_pci();
+ return 0;
+}
+
+subsys_initcall(pcibios_init);
+
+#ifdef ALPHA_RESTORE_SRM_SETUP
+/* Store PCI device configuration left by SRM here. */
+struct pdev_srm_saved_conf
+{
+ struct pdev_srm_saved_conf *next;
+ struct pci_dev *dev;
+};
+
+static struct pdev_srm_saved_conf *srm_saved_configs;
+
+static void pdev_save_srm_config(struct pci_dev *dev)
+{
+ struct pdev_srm_saved_conf *tmp;
+ static int printed = 0;
+
+ if (!alpha_using_srm || pci_has_flag(PCI_PROBE_ONLY))
+ return;
+
+ if (!printed) {
+ printk(KERN_INFO "pci: enabling save/restore of SRM state\n");
+ printed = 1;
+ }
+
+ tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
+ if (!tmp) {
+ printk(KERN_ERR "%s: kmalloc() failed!\n", __func__);
+ return;
+ }
+ tmp->next = srm_saved_configs;
+ tmp->dev = dev;
+
+ pci_save_state(dev);
+
+ srm_saved_configs = tmp;
+}
+
+void
+pci_restore_srm_config(void)
+{
+ struct pdev_srm_saved_conf *tmp;
+
+ /* No need to restore if probed only. */
+ if (pci_has_flag(PCI_PROBE_ONLY))
+ return;
+
+ /* Restore SRM config. */
+ for (tmp = srm_saved_configs; tmp; tmp = tmp->next) {
+ pci_restore_state(tmp->dev);
+ }
+}
+#else
+#define pdev_save_srm_config(dev) do {} while (0)
+#endif
+
+void pcibios_fixup_bus(struct pci_bus *bus)
+{
+ struct pci_dev *dev = bus->self;
+
+ if (pci_has_flag(PCI_PROBE_ONLY) && dev &&
+ (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
+ pci_read_bridge_bases(bus);
+ }
+
+ list_for_each_entry(dev, &bus->devices, bus_list) {
+ pdev_save_srm_config(dev);
+ }
+}
+
+/*
+ * If we set up a device for bus mastering, we need to check the latency
+ * timer as certain firmware forgets to set it properly, as seen
+ * on SX164 and LX164 with SRM.
+ */
+void
+pcibios_set_master(struct pci_dev *dev)
+{
+ u8 lat;
+ pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
+ if (lat >= 16) return;
+ printk("PCI: Setting latency timer of device %s to 64\n",
+ pci_name(dev));
+ pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64);
+}
+
+void __init
+pcibios_claim_one_bus(struct pci_bus *b)
+{
+ struct pci_dev *dev;
+ struct pci_bus *child_bus;
+
+ list_for_each_entry(dev, &b->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;
+ if (pci_has_flag(PCI_PROBE_ONLY) ||
+ (r->flags & IORESOURCE_PCI_FIXED)) {
+ if (pci_claim_resource(dev, i) == 0)
+ continue;
+
+ pci_claim_bridge_resource(dev, i);
+ }
+ }
+ }
+
+ list_for_each_entry(child_bus, &b->children, node)
+ pcibios_claim_one_bus(child_bus);
+}
+
+static void __init
+pcibios_claim_console_setup(void)
+{
+ struct pci_bus *b;
+
+ list_for_each_entry(b, &pci_root_buses, node)
+ pcibios_claim_one_bus(b);
+}
+
+void __init
+common_init_pci(void)
+{
+ struct pci_controller *hose;
+ struct list_head resources;
+ struct pci_host_bridge *bridge;
+ struct pci_bus *bus;
+ int ret, next_busno;
+ int need_domain_info = 0;
+ u32 pci_mem_end;
+ u32 sg_base;
+ unsigned long end;
+
+ /* Scan all of the recorded PCI controllers. */
+ for (next_busno = 0, hose = hose_head; hose; hose = hose->next) {
+ sg_base = hose->sg_pci ? hose->sg_pci->dma_base : ~0;
+
+ /* Adjust hose mem_space limit to prevent PCI allocations
+ in the iommu windows. */
+ pci_mem_end = min((u32)__direct_map_base, sg_base) - 1;
+ end = hose->mem_space->start + pci_mem_end;
+ if (hose->mem_space->end > end)
+ hose->mem_space->end = end;
+
+ INIT_LIST_HEAD(&resources);
+ pci_add_resource_offset(&resources, hose->io_space,
+ hose->io_space->start);
+ pci_add_resource_offset(&resources, hose->mem_space,
+ hose->mem_space->start);
+
+ bridge = pci_alloc_host_bridge(0);
+ if (!bridge)
+ continue;
+
+ list_splice_init(&resources, &bridge->windows);
+ bridge->dev.parent = NULL;
+ bridge->sysdata = hose;
+ bridge->busnr = next_busno;
+ bridge->ops = alpha_mv.pci_ops;
+ bridge->swizzle_irq = alpha_mv.pci_swizzle;
+ bridge->map_irq = alpha_mv.pci_map_irq;
+
+ ret = pci_scan_root_bus_bridge(bridge);
+ if (ret) {
+ pci_free_host_bridge(bridge);
+ continue;
+ }
+
+ bus = hose->bus = bridge->bus;
+ hose->need_domain_info = need_domain_info;
+ next_busno = bus->busn_res.end + 1;
+ /* Don't allow 8-bit bus number overflow inside the hose -
+ reserve some space for bridges. */
+ if (next_busno > 224) {
+ next_busno = 0;
+ need_domain_info = 1;
+ }
+ }
+
+ pcibios_claim_console_setup();
+
+ pci_assign_unassigned_resources();
+ for (hose = hose_head; hose; hose = hose->next) {
+ bus = hose->bus;
+ if (bus)
+ pci_bus_add_devices(bus);
+ }
+}
+
+struct pci_controller * __init
+alloc_pci_controller(void)
+{
+ struct pci_controller *hose;
+
+ hose = memblock_alloc(sizeof(*hose), SMP_CACHE_BYTES);
+ if (!hose)
+ panic("%s: Failed to allocate %zu bytes\n", __func__,
+ sizeof(*hose));
+
+ *hose_tail = hose;
+ hose_tail = &hose->next;
+
+ return hose;
+}
+
+struct resource * __init
+alloc_resource(void)
+{
+ void *ptr = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
+
+ if (!ptr)
+ panic("%s: Failed to allocate %zu bytes\n", __func__,
+ sizeof(struct resource));
+
+ return ptr;
+}
+
+
+/* Provide information on locations of various I/O regions in physical
+ memory. Do this on a per-card basis so that we choose the right hose. */
+
+SYSCALL_DEFINE3(pciconfig_iobase, long, which, unsigned long, bus,
+ unsigned long, dfn)
+{
+ struct pci_controller *hose;
+ struct pci_dev *dev;
+
+ /* from hose or from bus.devfn */
+ if (which & IOBASE_FROM_HOSE) {
+ for(hose = hose_head; hose; hose = hose->next)
+ if (hose->index == bus) break;
+ if (!hose) return -ENODEV;
+ } else {
+ /* Special hook for ISA access. */
+ if (bus == 0 && dfn == 0) {
+ hose = pci_isa_hose;
+ } else {
+ dev = pci_get_domain_bus_and_slot(0, bus, dfn);
+ if (!dev)
+ return -ENODEV;
+ hose = dev->sysdata;
+ pci_dev_put(dev);
+ }
+ }
+
+ switch (which & ~IOBASE_FROM_HOSE) {
+ case IOBASE_HOSE:
+ return hose->index;
+ case IOBASE_SPARSE_MEM:
+ return hose->sparse_mem_base;
+ case IOBASE_DENSE_MEM:
+ return hose->dense_mem_base;
+ case IOBASE_SPARSE_IO:
+ return hose->sparse_io_base;
+ case IOBASE_DENSE_IO:
+ return hose->dense_io_base;
+ case IOBASE_ROOT_BUS:
+ return hose->bus->number;
+ }
+
+ return -EOPNOTSUPP;
+}
+
+/* Destroy an __iomem token. Not copied from lib/iomap.c. */
+
+void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
+{
+ if (__is_mmio(addr))
+ iounmap(addr);
+}
+
+EXPORT_SYMBOL(pci_iounmap);
+
+/* FIXME: Some boxes have multiple ISA bridges! */
+struct pci_dev *isa_bridge;
+EXPORT_SYMBOL(isa_bridge);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-12 12:06:33 +0000