- 根目录:
- arch
- arm
- kernel
- bios32.c
/*
* linux/arch/arm/kernel/bios32.c
*
* PCI bios-type initialisation for PCI machines
*
* Bits taken from various places.
*/
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/io.h>
#include <asm/mach-types.h>
#include <asm/mach/pci.h>
static int debug_pci;
static int use_firmware;
/*
* We can't use pci_find_device() here since we are
* called from interrupt context.
*/
static void pcibios_bus_report_status(struct pci_bus *bus, u_int status_mask, int warn)
{
struct pci_dev *dev;
list_for_each_entry(dev, &bus->devices, bus_list) {
u16 status;
/*
* ignore host bridge - we handle
* that separately
*/
if (dev->bus->number == 0 && dev->devfn == 0)
continue;
pci_read_config_word(dev, PCI_STATUS, &status);
if (status == 0xffff)
continue;
if ((status & status_mask) == 0)
continue;
/* clear the status errors */
pci_write_config_word(dev, PCI_STATUS, status & status_mask);
if (warn)
printk("(%s: %04X) ", pci_name(dev), status);
}
list_for_each_entry(dev, &bus->devices, bus_list)
if (dev->subordinate)
pcibios_bus_report_status(dev->subordinate, status_mask, warn);
}
void pcibios_report_status(u_int status_mask, int warn)
{
struct list_head *l;
list_for_each(l, &pci_root_buses) {
struct pci_bus *bus = pci_bus_b(l);
pcibios_bus_report_status(bus, status_mask, warn);
}
}
/*
* We don't use this to fix the device, but initialisation of it.
* It's not the correct use for this, but it works.
* Note that the arbiter/ISA bridge appears to be buggy, specifically in
* the following area:
* 1. park on CPU
* 2. ISA bridge ping-pong
* 3. ISA bridge master handling of target RETRY
*
* Bug 3 is responsible for the sound DMA grinding to a halt. We now
* live with bug 2.
*/
static void __devinit pci_fixup_83c553(struct pci_dev *dev)
{
/*
* Set memory region to start at address 0, and enable IO
*/
pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, PCI_BASE_ADDRESS_SPACE_MEMORY);
pci_write_config_word(dev, PCI_COMMAND, PCI_COMMAND_IO);
dev->resource[0].end -= dev->resource[0].start;
dev->resource[0].start = 0;
/*
* All memory requests from ISA to be channelled to PCI
*/
pci_write_config_byte(dev, 0x48, 0xff);
/*
* Enable ping-pong on bus master to ISA bridge transactions.
* This improves the sound DMA substantially. The fixed
* priority arbiter also helps (see below).
*/
pci_write_config_byte(dev, 0x42, 0x01);
/*
* Enable PCI retry
*/
pci_write_config_byte(dev, 0x40, 0x22);
/*
* We used to set the arbiter to "park on last master" (bit
* 1 set), but unfortunately the CyberPro does not park the
* bus. We must therefore park on CPU. Unfortunately, this
* may trigger yet another bug in the 553.
*/
pci_write_config_byte(dev, 0x83, 0x02);
/*
* Make the ISA DMA request lowest priority, and disable
* rotating priorities completely.
*/
pci_write_config_byte(dev, 0x80, 0x11);
pci_write_config_byte(dev, 0x81, 0x00);
/*
* Route INTA input to IRQ 11, and set IRQ11 to be level
* sensitive.
*/
pci_write_config_word(dev, 0x44, 0xb000);
outb(0x08, 0x4d1);
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_83C553, pci_fixup_83c553);
static void __devinit pci_fixup_unassign(struct pci_dev *dev)
{
dev->resource[0].end -= dev->resource[0].start;
dev->resource[0].start = 0;
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND2, PCI_DEVICE_ID_WINBOND2_89C940F, pci_fixup_unassign);
/*
* Prevent the PCI layer from seeing the resources allocated to this device
* if it is the host bridge by marking it as such. These resources are of
* no consequence to the PCI layer (they are handled elsewhere).
*/
static void __devinit pci_fixup_dec21285(struct pci_dev *dev)
{
int i;
if (dev->devfn == 0) {
dev->class &= 0xff;
dev->class |= PCI_CLASS_BRIDGE_HOST << 8;
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
dev->resource[i].start = 0;
dev->resource[i].end = 0;
dev->resource[i].flags = 0;
}
}
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21285, pci_fixup_dec21285);
/*
* PCI IDE controllers use non-standard I/O port decoding, respect it.
*/
static void __devinit pci_fixup_ide_bases(struct pci_dev *dev)
{
struct resource *r;
int i;
if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE)
return;
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
r = dev->resource + i;
if ((r->start & ~0x80) == 0x374) {
r->start |= 2;
r->end = r->start;
}
}
}
DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases);
/*
* Put the DEC21142 to sleep
*/
static void __devinit pci_fixup_dec21142(struct pci_dev *dev)
{
pci_write_config_dword(dev, 0x40, 0x80000000);
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21142, pci_fixup_dec21142);
/*
* The CY82C693 needs some rather major fixups to ensure that it does
* the right thing. Idea from the Alpha people, with a few additions.
*
* We ensure that the IDE base registers are set to 1f0/3f4 for the
* primary bus, and 170/374 for the secondary bus. Also, hide them
* from the PCI subsystem view as well so we won't try to perform
* our own auto-configuration on them.
*
* In addition, we ensure that the PCI IDE interrupts are routed to
* IRQ 14 and IRQ 15 respectively.
*
* The above gets us to a point where the IDE on this device is
* functional. However, The CY82C693U _does not work_ in bus
* master mode without locking the PCI bus solid.
*/
static void __devinit pci_fixup_cy82c693(struct pci_dev *dev)
{
if ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE) {
u32 base0, base1;
if (dev->class & 0x80) { /* primary */
base0 = 0x1f0;
base1 = 0x3f4;
} else { /* secondary */
base0 = 0x170;
base1 = 0x374;
}
pci_write_config_dword(dev, PCI_BASE_ADDRESS_0,
base0 | PCI_BASE_ADDRESS_SPACE_IO);
pci_write_config_dword(dev, PCI_BASE_ADDRESS_1,
base1 | PCI_BASE_ADDRESS_SPACE_IO);
dev->resource[0].start = 0;
dev->resource[0].end = 0;
dev->resource[0].flags = 0;
dev->resource[1].start = 0;
dev->resource[1].end = 0;
dev->resource[1].flags = 0;
} else if (PCI_FUNC(dev->devfn) == 0) {
/*
* Setup IDE IRQ routing.
*/
pci_write_config_byte(dev, 0x4b, 14);
pci_write_config_byte(dev, 0x4c, 15);
/*
* Disable FREQACK handshake, enable USB.
*/
pci_write_config_byte(dev, 0x4d, 0x41);
/*
* Enable PCI retry, and PCI post-write buffer.
*/
pci_write_config_byte(dev, 0x44, 0x17);
/*
* Enable ISA master and DMA post write buffering.
*/
pci_write_config_byte(dev, 0x45, 0x03);
}
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693, pci_fixup_cy82c693);
static void __init pci_fixup_it8152(struct pci_dev *dev)
{
int i;
/* fixup for ITE 8152 devices */
/* FIXME: add defines for class 0x68000 and 0x80103 */
if ((dev->class >> 8) == PCI_CLASS_BRIDGE_HOST ||
dev->class == 0x68000 ||
dev->class == 0x80103) {
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
dev->resource[i].start = 0;
dev->resource[i].end = 0;
dev->resource[i].flags = 0;
}
}
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ITE, PCI_DEVICE_ID_ITE_8152, pci_fixup_it8152);
void __devinit pcibios_update_irq(struct pci_dev *dev, int irq)
{
if (debug_pci)
printk("PCI: Assigning IRQ %02d to %s\n", irq, pci_name(dev));
pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
}
/*
* If the bus contains any of these devices, then we must not turn on
* parity checking of any kind. Currently this is CyberPro 20x0 only.
*/
static inline int pdev_bad_for_parity(struct pci_dev *dev)
{
return ((dev->vendor == PCI_VENDOR_ID_INTERG &&
(dev->device == PCI_DEVICE_ID_INTERG_2000 ||
dev->device == PCI_DEVICE_ID_INTERG_2010)) ||
(dev->vendor == PCI_VENDOR_ID_ITE &&
dev->device == PCI_DEVICE_ID_ITE_8152));
}
/*
* Adjust the device resources from bus-centric to Linux-centric.
*/
static void __devinit
pdev_fixup_device_resources(struct pci_sys_data *root, struct pci_dev *dev)
{
resource_size_t offset;
int i;
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
if (dev->resource[i].start == 0)
continue;
if (dev->resource[i].flags & IORESOURCE_MEM)
offset = root->mem_offset;
else
offset = root->io_offset;
dev->resource[i].start += offset;
dev->resource[i].end += offset;
}
}
/*
* pcibios_fixup_bus - Called after each bus is probed,
* but before its children are examined.
*/
void pcibios_fixup_bus(struct pci_bus *bus)
{
struct pci_sys_data *root = bus->sysdata;
struct pci_dev *dev;
u16 features = PCI_COMMAND_SERR | PCI_COMMAND_PARITY | PCI_COMMAND_FAST_BACK;
/*
* Walk the devices on this bus, working out what we can
* and can't support.
*/
list_for_each_entry(dev, &bus->devices, bus_list) {
u16 status;
pdev_fixup_device_resources(root, dev);
pci_read_config_word(dev, PCI_STATUS, &status);
/*
* If any device on this bus does not support fast back
* to back transfers, then the bus as a whole is not able
* to support them. Having fast back to back transfers
* on saves us one PCI cycle per transaction.
*/
if (!(status & PCI_STATUS_FAST_BACK))
features &= ~PCI_COMMAND_FAST_BACK;
if (pdev_bad_for_parity(dev))
features &= ~(PCI_COMMAND_SERR | PCI_COMMAND_PARITY);
switch (dev->class >> 8) {
case PCI_CLASS_BRIDGE_PCI:
pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &status);
status |= PCI_BRIDGE_CTL_PARITY|PCI_BRIDGE_CTL_MASTER_ABORT;
status &= ~(PCI_BRIDGE_CTL_BUS_RESET|PCI_BRIDGE_CTL_FAST_BACK);
pci_write_config_word(dev, PCI_BRIDGE_CONTROL, status);
break;
case PCI_CLASS_BRIDGE_CARDBUS:
pci_read_config_word(dev, PCI_CB_BRIDGE_CONTROL, &status);
status |= PCI_CB_BRIDGE_CTL_PARITY|PCI_CB_BRIDGE_CTL_MASTER_ABORT;
pci_write_config_word(dev, PCI_CB_BRIDGE_CONTROL, status);
break;
}
}
/*
* Now walk the devices again, this time setting them up.
*/
list_for_each_entry(dev, &bus->devices, bus_list) {
u16 cmd;
pci_read_config_word(dev, PCI_COMMAND, &cmd);
cmd |= features;
pci_write_config_word(dev, PCI_COMMAND, cmd);
pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
L1_CACHE_BYTES >> 2);
}
/*
* Propagate the flags to the PCI bridge.
*/
if (bus->self && bus->self->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
if (features & PCI_COMMAND_FAST_BACK)
bus->bridge_ctl |= PCI_BRIDGE_CTL_FAST_BACK;
if (features & PCI_COMMAND_PARITY)
bus->bridge_ctl |= PCI_BRIDGE_CTL_PARITY;
}
/*
* Report what we did for this bus
*/
printk(KERN_INFO "PCI: bus%d: Fast back to back transfers %sabled\n",
bus->number, (features & PCI_COMMAND_FAST_BACK) ? "en" : "dis");
}
#ifdef CONFIG_HOTPLUG
EXPORT_SYMBOL(pcibios_fixup_bus);
#endif
/*
* Convert from Linux-centric to bus-centric addresses for bridge devices.
*/
void
pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
struct resource *res)
{
struct pci_sys_data *root = dev->sysdata;
unsigned long offset = 0;
if (res->flags & IORESOURCE_IO)
offset = root->io_offset;
if (res->flags & IORESOURCE_MEM)
offset = root->mem_offset;
region->start = res->start - offset;
region->end = res->end - offset;
}
EXPORT_SYMBOL(pcibios_resource_to_bus);
void __devinit
pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
struct pci_bus_region *region)
{
struct pci_sys_data *root = dev->sysdata;
unsigned long offset = 0;
if (res->flags & IORESOURCE_IO)
offset = root->io_offset;
if (res->flags & IORESOURCE_MEM)
offset = root->mem_offset;
res->start = region->start + offset;
res->end = region->end + offset;
}
EXPORT_SYMBOL(pcibios_bus_to_resource);
/*
* Swizzle the device pin each time we cross a bridge.
* This might update pin and returns the slot number.
*/
static u8 __devinit pcibios_swizzle(struct pci_dev *dev, u8 *pin)
{
struct pci_sys_data *sys = dev->sysdata;
int slot = 0, oldpin = *pin;
if (sys->swizzle)
slot = sys->swizzle(dev, pin);
if (debug_pci)
printk("PCI: %s swizzling pin %d => pin %d slot %d\n",
pci_name(dev), oldpin, *pin, slot);
return slot;
}
/*
* Map a slot/pin to an IRQ.
*/
static int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
struct pci_sys_data *sys = dev->sysdata;
int irq = -1;
if (sys->map_irq)
irq = sys->map_irq(dev, slot, pin);
if (debug_pci)
printk("PCI: %s mapping slot %d pin %d => irq %d\n",
pci_name(dev), slot, pin, irq);
return irq;
}
static void __init pcibios_init_hw(struct hw_pci *hw)
{
struct pci_sys_data *sys = NULL;
int ret;
int nr, busnr;
for (nr = busnr = 0; nr < hw->nr_controllers; nr++) {
sys = kzalloc(sizeof(struct pci_sys_data), GFP_KERNEL);
if (!sys)
panic("PCI: unable to allocate sys data!");
#ifdef CONFIG_PCI_DOMAINS
sys->domain = hw->domain;
#endif
sys->hw = hw;
sys->busnr = busnr;
sys->swizzle = hw->swizzle;
sys->map_irq = hw->map_irq;
INIT_LIST_HEAD(&sys->resources);
ret = hw->setup(nr, sys);
if (ret > 0) {
if (list_empty(&sys->resources)) {
pci_add_resource(&sys->resources,
&ioport_resource);
pci_add_resource(&sys->resources,
&iomem_resource);
}
sys->bus = hw->scan(nr, sys);
if (!sys->bus)
panic("PCI: unable to scan bus!");
busnr = sys->bus->subordinate + 1;
list_add(&sys->node, &hw->buses);
} else {
kfree(sys);
if (ret < 0)
break;
}
}
}
void __init pci_common_init(struct hw_pci *hw)
{
struct pci_sys_data *sys;
INIT_LIST_HEAD(&hw->buses);
if (hw->preinit)
hw->preinit();
pcibios_init_hw(hw);
if (hw->postinit)
hw->postinit();
pci_fixup_irqs(pcibios_swizzle, pcibios_map_irq);
list_for_each_entry(sys, &hw->buses, node) {
struct pci_bus *bus = sys->bus;
if (!use_firmware) {
/*
* Size the bridge windows.
*/
pci_bus_size_bridges(bus);
/*
* Assign resources.
*/
pci_bus_assign_resources(bus);
/*
* Enable bridges
*/
pci_enable_bridges(bus);
}
/*
* Tell drivers about devices found.
*/
pci_bus_add_devices(bus);
}
}
#ifndef CONFIG_PCI_HOST_ITE8152
void pcibios_set_master(struct pci_dev *dev)
{
/* No special bus mastering setup handling */
}
#endif
char * __init pcibios_setup(char *str)
{
if (!strcmp(str, "debug")) {
debug_pci = 1;
return NULL;
} else if (!strcmp(str, "firmware")) {
use_firmware = 1;
return NULL;
}
return str;
}
/*
* From arch/i386/kernel/pci-i386.c:
*
* 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 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)
{
resource_size_t start = res->start;
if (res->flags & IORESOURCE_IO && start & 0x300)
start = (start + 0x3ff) & ~0x3ff;
start = (start + align - 1) & ~(align - 1);
return start;
}
/**
* pcibios_enable_device - Enable I/O and memory.
* @dev: PCI device to be enabled
*/
int pcibios_enable_device(struct pci_dev *dev, int mask)
{
u16 cmd, old_cmd;
int idx;
struct resource *r;
pci_read_config_word(dev, PCI_COMMAND, &cmd);
old_cmd = cmd;
for (idx = 0; idx < 6; idx++) {
/* Only set up the requested stuff */
if (!(mask & (1 << idx)))
continue;
r = dev->resource + idx;
if (!r->start && r->end) {
printk(KERN_ERR "PCI: Device %s not available because"
" of resource collisions\n", pci_name(dev));
return -EINVAL;
}
if (r->flags & IORESOURCE_IO)
cmd |= PCI_COMMAND_IO;
if (r->flags & IORESOURCE_MEM)
cmd |= PCI_COMMAND_MEMORY;
}
/*
* Bridges (eg, cardbus bridges) need to be fully enabled
*/
if ((dev->class >> 16) == PCI_BASE_CLASS_BRIDGE)
cmd |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY;
if (cmd != old_cmd) {
printk("PCI: enabling device %s (%04x -> %04x)\n",
pci_name(dev), old_cmd, cmd);
pci_write_config_word(dev, PCI_COMMAND, cmd);
}
return 0;
}
int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
enum pci_mmap_state mmap_state, int write_combine)
{
struct pci_sys_data *root = dev->sysdata;
unsigned long phys;
if (mmap_state == pci_mmap_io) {
return -EINVAL;
} else {
phys = vma->vm_pgoff + (root->mem_offset >> PAGE_SHIFT);
}
/*
* Mark this as IO
*/
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
if (remap_pfn_range(vma, vma->vm_start, phys,
vma->vm_end - vma->vm_start,
vma->vm_page_prot))
return -EAGAIN;
return 0;
}