mirror of https://gitee.com/openkylin/linux.git
798 lines
19 KiB
C
798 lines
19 KiB
C
/*
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* pci.c - Low-Level PCI Access in IA-64
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*
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* Derived from bios32.c of i386 tree.
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*
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* (c) Copyright 2002, 2005 Hewlett-Packard Development Company, L.P.
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* David Mosberger-Tang <davidm@hpl.hp.com>
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* Bjorn Helgaas <bjorn.helgaas@hp.com>
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* Copyright (C) 2004 Silicon Graphics, Inc.
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*
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* Note: Above list of copyright holders is incomplete...
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*/
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#include <linux/acpi.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/bootmem.h>
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#include <asm/machvec.h>
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#include <asm/page.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <asm/sal.h>
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#include <asm/smp.h>
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#include <asm/irq.h>
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#include <asm/hw_irq.h>
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/*
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* Low-level SAL-based PCI configuration access functions. Note that SAL
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* calls are already serialized (via sal_lock), so we don't need another
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* synchronization mechanism here.
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*/
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#define PCI_SAL_ADDRESS(seg, bus, devfn, reg) \
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(((u64) seg << 24) | (bus << 16) | (devfn << 8) | (reg))
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/* SAL 3.2 adds support for extended config space. */
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#define PCI_SAL_EXT_ADDRESS(seg, bus, devfn, reg) \
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(((u64) seg << 28) | (bus << 20) | (devfn << 12) | (reg))
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int raw_pci_read(unsigned int seg, unsigned int bus, unsigned int devfn,
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int reg, int len, u32 *value)
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{
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u64 addr, data = 0;
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int mode, result;
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if (!value || (seg > 65535) || (bus > 255) || (devfn > 255) || (reg > 4095))
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return -EINVAL;
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if ((seg | reg) <= 255) {
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addr = PCI_SAL_ADDRESS(seg, bus, devfn, reg);
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mode = 0;
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} else if (sal_revision >= SAL_VERSION_CODE(3,2)) {
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addr = PCI_SAL_EXT_ADDRESS(seg, bus, devfn, reg);
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mode = 1;
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} else {
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return -EINVAL;
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}
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result = ia64_sal_pci_config_read(addr, mode, len, &data);
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if (result != 0)
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return -EINVAL;
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*value = (u32) data;
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return 0;
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}
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int raw_pci_write(unsigned int seg, unsigned int bus, unsigned int devfn,
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int reg, int len, u32 value)
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{
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u64 addr;
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int mode, result;
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if ((seg > 65535) || (bus > 255) || (devfn > 255) || (reg > 4095))
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return -EINVAL;
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if ((seg | reg) <= 255) {
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addr = PCI_SAL_ADDRESS(seg, bus, devfn, reg);
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mode = 0;
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} else if (sal_revision >= SAL_VERSION_CODE(3,2)) {
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addr = PCI_SAL_EXT_ADDRESS(seg, bus, devfn, reg);
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mode = 1;
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} else {
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return -EINVAL;
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}
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result = ia64_sal_pci_config_write(addr, mode, len, value);
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if (result != 0)
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return -EINVAL;
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return 0;
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}
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static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
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int size, u32 *value)
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{
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return raw_pci_read(pci_domain_nr(bus), bus->number,
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devfn, where, size, value);
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}
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static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
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int size, u32 value)
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{
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return raw_pci_write(pci_domain_nr(bus), bus->number,
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devfn, where, size, value);
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}
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struct pci_ops pci_root_ops = {
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.read = pci_read,
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.write = pci_write,
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};
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/* Called by ACPI when it finds a new root bus. */
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static struct pci_controller * __devinit
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alloc_pci_controller (int seg)
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{
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struct pci_controller *controller;
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controller = kzalloc(sizeof(*controller), GFP_KERNEL);
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if (!controller)
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return NULL;
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controller->segment = seg;
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controller->node = -1;
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return controller;
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}
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struct pci_root_info {
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struct acpi_device *bridge;
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struct pci_controller *controller;
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char *name;
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};
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static unsigned int
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new_space (u64 phys_base, int sparse)
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{
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u64 mmio_base;
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int i;
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if (phys_base == 0)
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return 0; /* legacy I/O port space */
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mmio_base = (u64) ioremap(phys_base, 0);
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for (i = 0; i < num_io_spaces; i++)
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if (io_space[i].mmio_base == mmio_base &&
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io_space[i].sparse == sparse)
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return i;
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if (num_io_spaces == MAX_IO_SPACES) {
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printk(KERN_ERR "PCI: Too many IO port spaces "
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"(MAX_IO_SPACES=%lu)\n", MAX_IO_SPACES);
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return ~0;
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}
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i = num_io_spaces++;
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io_space[i].mmio_base = mmio_base;
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io_space[i].sparse = sparse;
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return i;
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}
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static u64 __devinit
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add_io_space (struct pci_root_info *info, struct acpi_resource_address64 *addr)
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{
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struct resource *resource;
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char *name;
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unsigned long base, min, max, base_port;
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unsigned int sparse = 0, space_nr, len;
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resource = kzalloc(sizeof(*resource), GFP_KERNEL);
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if (!resource) {
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printk(KERN_ERR "PCI: No memory for %s I/O port space\n",
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info->name);
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goto out;
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}
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len = strlen(info->name) + 32;
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name = kzalloc(len, GFP_KERNEL);
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if (!name) {
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printk(KERN_ERR "PCI: No memory for %s I/O port space name\n",
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info->name);
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goto free_resource;
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}
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min = addr->minimum;
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max = min + addr->address_length - 1;
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if (addr->info.io.translation_type == ACPI_SPARSE_TRANSLATION)
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sparse = 1;
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space_nr = new_space(addr->translation_offset, sparse);
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if (space_nr == ~0)
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goto free_name;
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base = __pa(io_space[space_nr].mmio_base);
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base_port = IO_SPACE_BASE(space_nr);
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snprintf(name, len, "%s I/O Ports %08lx-%08lx", info->name,
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base_port + min, base_port + max);
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/*
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* The SDM guarantees the legacy 0-64K space is sparse, but if the
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* mapping is done by the processor (not the bridge), ACPI may not
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* mark it as sparse.
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*/
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if (space_nr == 0)
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sparse = 1;
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resource->name = name;
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resource->flags = IORESOURCE_MEM;
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resource->start = base + (sparse ? IO_SPACE_SPARSE_ENCODING(min) : min);
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resource->end = base + (sparse ? IO_SPACE_SPARSE_ENCODING(max) : max);
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insert_resource(&iomem_resource, resource);
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return base_port;
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free_name:
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kfree(name);
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free_resource:
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kfree(resource);
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out:
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return ~0;
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}
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static acpi_status __devinit resource_to_window(struct acpi_resource *resource,
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struct acpi_resource_address64 *addr)
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{
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acpi_status status;
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/*
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* We're only interested in _CRS descriptors that are
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* - address space descriptors for memory or I/O space
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* - non-zero size
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* - producers, i.e., the address space is routed downstream,
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* not consumed by the bridge itself
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*/
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status = acpi_resource_to_address64(resource, addr);
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if (ACPI_SUCCESS(status) &&
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(addr->resource_type == ACPI_MEMORY_RANGE ||
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addr->resource_type == ACPI_IO_RANGE) &&
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addr->address_length &&
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addr->producer_consumer == ACPI_PRODUCER)
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return AE_OK;
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return AE_ERROR;
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}
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static acpi_status __devinit
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count_window (struct acpi_resource *resource, void *data)
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{
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unsigned int *windows = (unsigned int *) data;
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struct acpi_resource_address64 addr;
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acpi_status status;
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status = resource_to_window(resource, &addr);
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if (ACPI_SUCCESS(status))
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(*windows)++;
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return AE_OK;
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}
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static __devinit acpi_status add_window(struct acpi_resource *res, void *data)
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{
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struct pci_root_info *info = data;
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struct pci_window *window;
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struct acpi_resource_address64 addr;
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acpi_status status;
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unsigned long flags, offset = 0;
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struct resource *root;
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/* Return AE_OK for non-window resources to keep scanning for more */
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status = resource_to_window(res, &addr);
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if (!ACPI_SUCCESS(status))
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return AE_OK;
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if (addr.resource_type == ACPI_MEMORY_RANGE) {
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flags = IORESOURCE_MEM;
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root = &iomem_resource;
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offset = addr.translation_offset;
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} else if (addr.resource_type == ACPI_IO_RANGE) {
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flags = IORESOURCE_IO;
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root = &ioport_resource;
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offset = add_io_space(info, &addr);
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if (offset == ~0)
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return AE_OK;
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} else
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return AE_OK;
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window = &info->controller->window[info->controller->windows++];
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window->resource.name = info->name;
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window->resource.flags = flags;
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window->resource.start = addr.minimum + offset;
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window->resource.end = window->resource.start + addr.address_length - 1;
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window->resource.child = NULL;
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window->offset = offset;
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if (insert_resource(root, &window->resource)) {
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dev_err(&info->bridge->dev,
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"can't allocate host bridge window %pR\n",
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&window->resource);
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} else {
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if (offset)
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dev_info(&info->bridge->dev, "host bridge window %pR "
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"(PCI address [%#llx-%#llx])\n",
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&window->resource,
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window->resource.start - offset,
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window->resource.end - offset);
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else
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dev_info(&info->bridge->dev,
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"host bridge window %pR\n",
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&window->resource);
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}
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return AE_OK;
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}
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static void __devinit
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pcibios_setup_root_windows(struct pci_bus *bus, struct pci_controller *ctrl)
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{
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int i;
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pci_bus_remove_resources(bus);
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for (i = 0; i < ctrl->windows; i++) {
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struct resource *res = &ctrl->window[i].resource;
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/* HP's firmware has a hack to work around a Windows bug.
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* Ignore these tiny memory ranges */
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if ((res->flags & IORESOURCE_MEM) &&
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(res->end - res->start < 16))
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continue;
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pci_bus_add_resource(bus, res, 0);
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}
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}
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struct pci_bus * __devinit
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pci_acpi_scan_root(struct acpi_pci_root *root)
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{
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struct acpi_device *device = root->device;
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int domain = root->segment;
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int bus = root->secondary.start;
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struct pci_controller *controller;
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unsigned int windows = 0;
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struct pci_bus *pbus;
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char *name;
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int pxm;
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controller = alloc_pci_controller(domain);
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if (!controller)
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goto out1;
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controller->acpi_handle = device->handle;
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pxm = acpi_get_pxm(controller->acpi_handle);
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#ifdef CONFIG_NUMA
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if (pxm >= 0)
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controller->node = pxm_to_node(pxm);
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#endif
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acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_window,
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&windows);
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if (windows) {
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struct pci_root_info info;
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controller->window =
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kmalloc_node(sizeof(*controller->window) * windows,
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GFP_KERNEL, controller->node);
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if (!controller->window)
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goto out2;
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name = kmalloc(16, GFP_KERNEL);
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if (!name)
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goto out3;
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sprintf(name, "PCI Bus %04x:%02x", domain, bus);
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info.bridge = device;
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info.controller = controller;
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info.name = name;
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acpi_walk_resources(device->handle, METHOD_NAME__CRS,
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add_window, &info);
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}
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/*
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* See arch/x86/pci/acpi.c.
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* The desired pci bus might already be scanned in a quirk. We
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* should handle the case here, but it appears that IA64 hasn't
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* such quirk. So we just ignore the case now.
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*/
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pbus = pci_scan_bus_parented(NULL, bus, &pci_root_ops, controller);
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return pbus;
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out3:
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kfree(controller->window);
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out2:
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kfree(controller);
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out1:
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return NULL;
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}
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void pcibios_resource_to_bus(struct pci_dev *dev,
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struct pci_bus_region *region, struct resource *res)
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{
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struct pci_controller *controller = PCI_CONTROLLER(dev);
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unsigned long offset = 0;
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int i;
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for (i = 0; i < controller->windows; i++) {
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struct pci_window *window = &controller->window[i];
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if (!(window->resource.flags & res->flags))
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continue;
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if (window->resource.start > res->start)
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continue;
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if (window->resource.end < res->end)
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continue;
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offset = window->offset;
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break;
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}
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region->start = res->start - offset;
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region->end = res->end - offset;
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}
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EXPORT_SYMBOL(pcibios_resource_to_bus);
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void pcibios_bus_to_resource(struct pci_dev *dev,
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struct resource *res, struct pci_bus_region *region)
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{
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struct pci_controller *controller = PCI_CONTROLLER(dev);
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unsigned long offset = 0;
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int i;
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for (i = 0; i < controller->windows; i++) {
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struct pci_window *window = &controller->window[i];
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if (!(window->resource.flags & res->flags))
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continue;
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if (window->resource.start - window->offset > region->start)
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continue;
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if (window->resource.end - window->offset < region->end)
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continue;
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offset = window->offset;
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break;
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}
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res->start = region->start + offset;
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res->end = region->end + offset;
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}
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EXPORT_SYMBOL(pcibios_bus_to_resource);
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static int __devinit is_valid_resource(struct pci_dev *dev, int idx)
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{
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unsigned int i, type_mask = IORESOURCE_IO | IORESOURCE_MEM;
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struct resource *devr = &dev->resource[idx], *busr;
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if (!dev->bus)
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return 0;
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pci_bus_for_each_resource(dev->bus, busr, i) {
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if (!busr || ((busr->flags ^ devr->flags) & type_mask))
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continue;
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if ((devr->start) && (devr->start >= busr->start) &&
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(devr->end <= busr->end))
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return 1;
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}
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return 0;
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}
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static void __devinit
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pcibios_fixup_resources(struct pci_dev *dev, int start, int limit)
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{
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struct pci_bus_region region;
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int i;
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for (i = start; i < limit; i++) {
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if (!dev->resource[i].flags)
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continue;
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region.start = dev->resource[i].start;
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region.end = dev->resource[i].end;
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pcibios_bus_to_resource(dev, &dev->resource[i], ®ion);
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if ((is_valid_resource(dev, i)))
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pci_claim_resource(dev, i);
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}
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}
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void __devinit pcibios_fixup_device_resources(struct pci_dev *dev)
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{
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pcibios_fixup_resources(dev, 0, PCI_BRIDGE_RESOURCES);
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}
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EXPORT_SYMBOL_GPL(pcibios_fixup_device_resources);
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static void __devinit pcibios_fixup_bridge_resources(struct pci_dev *dev)
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{
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pcibios_fixup_resources(dev, PCI_BRIDGE_RESOURCES, PCI_NUM_RESOURCES);
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}
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/*
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* Called after each bus is probed, but before its children are examined.
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*/
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void __devinit
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pcibios_fixup_bus (struct pci_bus *b)
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{
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struct pci_dev *dev;
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if (b->self) {
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pci_read_bridge_bases(b);
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pcibios_fixup_bridge_resources(b->self);
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} else {
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pcibios_setup_root_windows(b, b->sysdata);
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}
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list_for_each_entry(dev, &b->devices, bus_list)
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pcibios_fixup_device_resources(dev);
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platform_pci_fixup_bus(b);
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return;
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}
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void __devinit
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pcibios_update_irq (struct pci_dev *dev, int irq)
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{
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pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
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/* ??? FIXME -- record old value for shutdown. */
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}
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int
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pcibios_enable_device (struct pci_dev *dev, int mask)
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{
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int ret;
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ret = pci_enable_resources(dev, mask);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (!dev->msi_enabled)
|
|
return acpi_pci_irq_enable(dev);
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
pcibios_disable_device (struct pci_dev *dev)
|
|
{
|
|
BUG_ON(atomic_read(&dev->enable_cnt));
|
|
if (!dev->msi_enabled)
|
|
acpi_pci_irq_disable(dev);
|
|
}
|
|
|
|
resource_size_t
|
|
pcibios_align_resource (void *data, const struct resource *res,
|
|
resource_size_t size, resource_size_t align)
|
|
{
|
|
return res->start;
|
|
}
|
|
|
|
/*
|
|
* PCI BIOS setup, always defaults to SAL interface
|
|
*/
|
|
char * __init
|
|
pcibios_setup (char *str)
|
|
{
|
|
return str;
|
|
}
|
|
|
|
int
|
|
pci_mmap_page_range (struct pci_dev *dev, struct vm_area_struct *vma,
|
|
enum pci_mmap_state mmap_state, int write_combine)
|
|
{
|
|
unsigned long size = vma->vm_end - vma->vm_start;
|
|
pgprot_t prot;
|
|
|
|
/*
|
|
* I/O space cannot be accessed via normal processor loads and
|
|
* stores on this platform.
|
|
*/
|
|
if (mmap_state == pci_mmap_io)
|
|
/*
|
|
* XXX we could relax this for I/O spaces for which ACPI
|
|
* indicates that the space is 1-to-1 mapped. But at the
|
|
* moment, we don't support multiple PCI address spaces and
|
|
* the legacy I/O space is not 1-to-1 mapped, so this is moot.
|
|
*/
|
|
return -EINVAL;
|
|
|
|
if (!valid_mmap_phys_addr_range(vma->vm_pgoff, size))
|
|
return -EINVAL;
|
|
|
|
prot = phys_mem_access_prot(NULL, vma->vm_pgoff, size,
|
|
vma->vm_page_prot);
|
|
|
|
/*
|
|
* If the user requested WC, the kernel uses UC or WC for this region,
|
|
* and the chipset supports WC, we can use WC. Otherwise, we have to
|
|
* use the same attribute the kernel uses.
|
|
*/
|
|
if (write_combine &&
|
|
((pgprot_val(prot) & _PAGE_MA_MASK) == _PAGE_MA_UC ||
|
|
(pgprot_val(prot) & _PAGE_MA_MASK) == _PAGE_MA_WC) &&
|
|
efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
|
|
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
|
|
else
|
|
vma->vm_page_prot = prot;
|
|
|
|
if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
|
|
vma->vm_end - vma->vm_start, vma->vm_page_prot))
|
|
return -EAGAIN;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ia64_pci_get_legacy_mem - generic legacy mem routine
|
|
* @bus: bus to get legacy memory base address for
|
|
*
|
|
* Find the base of legacy memory for @bus. This is typically the first
|
|
* megabyte of bus address space for @bus or is simply 0 on platforms whose
|
|
* chipsets support legacy I/O and memory routing. Returns the base address
|
|
* or an error pointer if an error occurred.
|
|
*
|
|
* This is the ia64 generic version of this routine. Other platforms
|
|
* are free to override it with a machine vector.
|
|
*/
|
|
char *ia64_pci_get_legacy_mem(struct pci_bus *bus)
|
|
{
|
|
return (char *)__IA64_UNCACHED_OFFSET;
|
|
}
|
|
|
|
/**
|
|
* pci_mmap_legacy_page_range - map legacy memory space to userland
|
|
* @bus: bus whose legacy space we're mapping
|
|
* @vma: vma passed in by mmap
|
|
*
|
|
* Map legacy memory space for this device back to userspace using a machine
|
|
* vector to get the base address.
|
|
*/
|
|
int
|
|
pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma,
|
|
enum pci_mmap_state mmap_state)
|
|
{
|
|
unsigned long size = vma->vm_end - vma->vm_start;
|
|
pgprot_t prot;
|
|
char *addr;
|
|
|
|
/* We only support mmap'ing of legacy memory space */
|
|
if (mmap_state != pci_mmap_mem)
|
|
return -ENOSYS;
|
|
|
|
/*
|
|
* Avoid attribute aliasing. See Documentation/ia64/aliasing.txt
|
|
* for more details.
|
|
*/
|
|
if (!valid_mmap_phys_addr_range(vma->vm_pgoff, size))
|
|
return -EINVAL;
|
|
prot = phys_mem_access_prot(NULL, vma->vm_pgoff, size,
|
|
vma->vm_page_prot);
|
|
|
|
addr = pci_get_legacy_mem(bus);
|
|
if (IS_ERR(addr))
|
|
return PTR_ERR(addr);
|
|
|
|
vma->vm_pgoff += (unsigned long)addr >> PAGE_SHIFT;
|
|
vma->vm_page_prot = prot;
|
|
|
|
if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
|
|
size, vma->vm_page_prot))
|
|
return -EAGAIN;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ia64_pci_legacy_read - read from legacy I/O space
|
|
* @bus: bus to read
|
|
* @port: legacy port value
|
|
* @val: caller allocated storage for returned value
|
|
* @size: number of bytes to read
|
|
*
|
|
* Simply reads @size bytes from @port and puts the result in @val.
|
|
*
|
|
* Again, this (and the write routine) are generic versions that can be
|
|
* overridden by the platform. This is necessary on platforms that don't
|
|
* support legacy I/O routing or that hard fail on legacy I/O timeouts.
|
|
*/
|
|
int ia64_pci_legacy_read(struct pci_bus *bus, u16 port, u32 *val, u8 size)
|
|
{
|
|
int ret = size;
|
|
|
|
switch (size) {
|
|
case 1:
|
|
*val = inb(port);
|
|
break;
|
|
case 2:
|
|
*val = inw(port);
|
|
break;
|
|
case 4:
|
|
*val = inl(port);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* ia64_pci_legacy_write - perform a legacy I/O write
|
|
* @bus: bus pointer
|
|
* @port: port to write
|
|
* @val: value to write
|
|
* @size: number of bytes to write from @val
|
|
*
|
|
* Simply writes @size bytes of @val to @port.
|
|
*/
|
|
int ia64_pci_legacy_write(struct pci_bus *bus, u16 port, u32 val, u8 size)
|
|
{
|
|
int ret = size;
|
|
|
|
switch (size) {
|
|
case 1:
|
|
outb(val, port);
|
|
break;
|
|
case 2:
|
|
outw(val, port);
|
|
break;
|
|
case 4:
|
|
outl(val, port);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* set_pci_cacheline_size - determine cacheline size for PCI devices
|
|
*
|
|
* We want to use the line-size of the outer-most cache. We assume
|
|
* that this line-size is the same for all CPUs.
|
|
*
|
|
* Code mostly taken from arch/ia64/kernel/palinfo.c:cache_info().
|
|
*/
|
|
static void __init set_pci_dfl_cacheline_size(void)
|
|
{
|
|
unsigned long levels, unique_caches;
|
|
long status;
|
|
pal_cache_config_info_t cci;
|
|
|
|
status = ia64_pal_cache_summary(&levels, &unique_caches);
|
|
if (status != 0) {
|
|
printk(KERN_ERR "%s: ia64_pal_cache_summary() failed "
|
|
"(status=%ld)\n", __func__, status);
|
|
return;
|
|
}
|
|
|
|
status = ia64_pal_cache_config_info(levels - 1,
|
|
/* cache_type (data_or_unified)= */ 2, &cci);
|
|
if (status != 0) {
|
|
printk(KERN_ERR "%s: ia64_pal_cache_config_info() failed "
|
|
"(status=%ld)\n", __func__, status);
|
|
return;
|
|
}
|
|
pci_dfl_cache_line_size = (1 << cci.pcci_line_size) / 4;
|
|
}
|
|
|
|
u64 ia64_dma_get_required_mask(struct device *dev)
|
|
{
|
|
u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
|
|
u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
|
|
u64 mask;
|
|
|
|
if (!high_totalram) {
|
|
/* convert to mask just covering totalram */
|
|
low_totalram = (1 << (fls(low_totalram) - 1));
|
|
low_totalram += low_totalram - 1;
|
|
mask = low_totalram;
|
|
} else {
|
|
high_totalram = (1 << (fls(high_totalram) - 1));
|
|
high_totalram += high_totalram - 1;
|
|
mask = (((u64)high_totalram) << 32) + 0xffffffff;
|
|
}
|
|
return mask;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ia64_dma_get_required_mask);
|
|
|
|
u64 dma_get_required_mask(struct device *dev)
|
|
{
|
|
return platform_dma_get_required_mask(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dma_get_required_mask);
|
|
|
|
static int __init pcibios_init(void)
|
|
{
|
|
set_pci_dfl_cacheline_size();
|
|
return 0;
|
|
}
|
|
|
|
subsys_initcall(pcibios_init);
|