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linux_old1/drivers/ide/setup-pci.c

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/*
* linux/drivers/ide/setup-pci.c Version 1.10 2002/08/19
*
* Copyright (c) 1998-2000 Andre Hedrick <andre@linux-ide.org>
*
* Copyright (c) 1995-1998 Mark Lord
* May be copied or modified under the terms of the GNU General Public License
*
* Recent Changes
* Split the set up function into multiple functions
* Use pci_set_master
* Fix misreporting of I/O v MMIO problems
* Initial fixups for simplex devices
*/
/*
* This module provides support for automatic detection and
* configuration of all PCI IDE interfaces present in a system.
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/ide.h>
#include <linux/dma-mapping.h>
#include <asm/io.h>
#include <asm/irq.h>
/**
* ide_match_hwif - match a PCI IDE against an ide_hwif
* @io_base: I/O base of device
* @bootable: set if its bootable
* @name: name of device
*
* Match a PCI IDE port against an entry in ide_hwifs[],
* based on io_base port if possible. Return the matching hwif,
* or a new hwif. If we find an error (clashing, out of devices, etc)
* return NULL
*
* FIXME: we need to handle mmio matches here too
*/
static ide_hwif_t *ide_match_hwif(unsigned long io_base, u8 bootable, const char *name)
{
int h;
ide_hwif_t *hwif;
/*
* Look for a hwif with matching io_base specified using
* parameters to ide_setup().
*/
for (h = 0; h < MAX_HWIFS; ++h) {
hwif = &ide_hwifs[h];
if (hwif->io_ports[IDE_DATA_OFFSET] == io_base) {
if (hwif->chipset == ide_forced)
return hwif; /* a perfect match */
}
}
/*
* Look for a hwif with matching io_base default value.
* If chipset is "ide_unknown", then claim that hwif slot.
* Otherwise, some other chipset has already claimed it.. :(
*/
for (h = 0; h < MAX_HWIFS; ++h) {
hwif = &ide_hwifs[h];
if (hwif->io_ports[IDE_DATA_OFFSET] == io_base) {
if (hwif->chipset == ide_unknown)
return hwif; /* match */
printk(KERN_ERR "%s: port 0x%04lx already claimed by %s\n",
name, io_base, hwif->name);
return NULL; /* already claimed */
}
}
/*
* Okay, there is no hwif matching our io_base,
* so we'll just claim an unassigned slot.
* Give preference to claiming other slots before claiming ide0/ide1,
* just in case there's another interface yet-to-be-scanned
* which uses ports 1f0/170 (the ide0/ide1 defaults).
*
* Unless there is a bootable card that does not use the standard
* ports 1f0/170 (the ide0/ide1 defaults). The (bootable) flag.
*/
if (bootable) {
for (h = 0; h < MAX_HWIFS; ++h) {
hwif = &ide_hwifs[h];
if (hwif->chipset == ide_unknown)
return hwif; /* pick an unused entry */
}
} else {
for (h = 2; h < MAX_HWIFS; ++h) {
hwif = ide_hwifs + h;
if (hwif->chipset == ide_unknown)
return hwif; /* pick an unused entry */
}
}
for (h = 0; h < 2; ++h) {
hwif = ide_hwifs + h;
if (hwif->chipset == ide_unknown)
return hwif; /* pick an unused entry */
}
printk(KERN_ERR "%s: too many IDE interfaces, no room in table\n", name);
return NULL;
}
/**
* ide_setup_pci_baseregs - place a PCI IDE controller native
* @dev: PCI device of interface to switch native
* @name: Name of interface
*
* We attempt to place the PCI interface into PCI native mode. If
* we succeed the BARs are ok and the controller is in PCI mode.
* Returns 0 on success or an errno code.
*
* FIXME: if we program the interface and then fail to set the BARS
* we don't switch it back to legacy mode. Do we actually care ??
*/
static int ide_setup_pci_baseregs (struct pci_dev *dev, const char *name)
{
u8 progif = 0;
/*
* Place both IDE interfaces into PCI "native" mode:
*/
if (pci_read_config_byte(dev, PCI_CLASS_PROG, &progif) ||
(progif & 5) != 5) {
if ((progif & 0xa) != 0xa) {
printk(KERN_INFO "%s: device not capable of full "
"native PCI mode\n", name);
return -EOPNOTSUPP;
}
printk("%s: placing both ports into native PCI mode\n", name);
(void) pci_write_config_byte(dev, PCI_CLASS_PROG, progif|5);
if (pci_read_config_byte(dev, PCI_CLASS_PROG, &progif) ||
(progif & 5) != 5) {
printk(KERN_ERR "%s: rewrite of PROGIF failed, wanted "
"0x%04x, got 0x%04x\n",
name, progif|5, progif);
return -EOPNOTSUPP;
}
}
return 0;
}
#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
#ifdef CONFIG_BLK_DEV_IDEDMA_FORCED
/*
* Long lost data from 2.0.34 that is now in 2.0.39
*
* This was used in ./drivers/block/triton.c to do DMA Base address setup
* when PnP failed. Oh the things we forget. I believe this was part
* of SFF-8038i that has been withdrawn from public access... :-((
*/
#define DEFAULT_BMIBA 0xe800 /* in case BIOS did not init it */
#define DEFAULT_BMCRBA 0xcc00 /* VIA's default value */
#define DEFAULT_BMALIBA 0xd400 /* ALI's default value */
#endif /* CONFIG_BLK_DEV_IDEDMA_FORCED */
/**
* ide_get_or_set_dma_base - setup BMIBA
* @hwif: Interface
*
* Fetch the DMA Bus-Master-I/O-Base-Address (BMIBA) from PCI space:
* If need be we set up the DMA base. Where a device has a partner that
* is already in DMA mode we check and enforce IDE simplex rules.
*/
static unsigned long ide_get_or_set_dma_base (ide_hwif_t *hwif)
{
unsigned long dma_base = 0;
struct pci_dev *dev = hwif->pci_dev;
#ifdef CONFIG_BLK_DEV_IDEDMA_FORCED
int second_chance = 0;
second_chance_to_dma:
#endif /* CONFIG_BLK_DEV_IDEDMA_FORCED */
if (hwif->mmio)
return hwif->dma_base;
if (hwif->mate && hwif->mate->dma_base) {
dma_base = hwif->mate->dma_base - (hwif->channel ? 0 : 8);
} else {
dma_base = pci_resource_start(dev, 4);
if (!dma_base) {
printk(KERN_ERR "%s: dma_base is invalid\n",
hwif->cds->name);
}
}
#ifdef CONFIG_BLK_DEV_IDEDMA_FORCED
/* FIXME - should use pci_assign_resource surely */
if ((!dma_base) && (!second_chance)) {
unsigned long set_bmiba = 0;
second_chance++;
switch(dev->vendor) {
case PCI_VENDOR_ID_AL:
set_bmiba = DEFAULT_BMALIBA; break;
case PCI_VENDOR_ID_VIA:
set_bmiba = DEFAULT_BMCRBA; break;
case PCI_VENDOR_ID_INTEL:
set_bmiba = DEFAULT_BMIBA; break;
default:
return dma_base;
}
pci_write_config_dword(dev, 0x20, set_bmiba|1);
goto second_chance_to_dma;
}
#endif /* CONFIG_BLK_DEV_IDEDMA_FORCED */
if (dma_base) {
u8 simplex_stat = 0;
dma_base += hwif->channel ? 8 : 0;
switch(dev->device) {
case PCI_DEVICE_ID_AL_M5219:
case PCI_DEVICE_ID_AL_M5229:
case PCI_DEVICE_ID_AMD_VIPER_7409:
case PCI_DEVICE_ID_CMD_643:
case PCI_DEVICE_ID_SERVERWORKS_CSB5IDE:
case PCI_DEVICE_ID_REVOLUTION:
simplex_stat = hwif->INB(dma_base + 2);
hwif->OUTB((simplex_stat&0x60),(dma_base + 2));
simplex_stat = hwif->INB(dma_base + 2);
if (simplex_stat & 0x80) {
printk(KERN_INFO "%s: simplex device: "
"DMA forced\n",
hwif->cds->name);
}
break;
default:
/*
* If the device claims "simplex" DMA,
* this means only one of the two interfaces
* can be trusted with DMA at any point in time.
* So we should enable DMA only on one of the
* two interfaces.
*/
simplex_stat = hwif->INB(dma_base + 2);
if (simplex_stat & 0x80) {
/* simplex device? */
/*
* At this point we haven't probed the drives so we can't make the
* appropriate decision. Really we should defer this problem
* until we tune the drive then try to grab DMA ownership if we want
* to be the DMA end. This has to be become dynamic to handle hot
* plug.
*/
if (hwif->mate && hwif->mate->dma_base) {
printk(KERN_INFO "%s: simplex device: "
"DMA disabled\n",
hwif->cds->name);
dma_base = 0;
}
}
}
}
return dma_base;
}
#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
void ide_setup_pci_noise (struct pci_dev *dev, ide_pci_device_t *d)
{
printk(KERN_INFO "%s: IDE controller at PCI slot %s\n",
d->name, pci_name(dev));
}
EXPORT_SYMBOL_GPL(ide_setup_pci_noise);
/**
* ide_pci_enable - do PCI enables
* @dev: PCI device
* @d: IDE pci device data
*
* Enable the IDE PCI device. We attempt to enable the device in full
* but if that fails then we only need BAR4 so we will enable that.
*
* Returns zero on success or an error code
*/
static int ide_pci_enable(struct pci_dev *dev, ide_pci_device_t *d)
{
int ret;
if (pci_enable_device(dev)) {
ret = pci_enable_device_bars(dev, 1 << 4);
if (ret < 0) {
printk(KERN_WARNING "%s: (ide_setup_pci_device:) "
"Could not enable device.\n", d->name);
goto out;
}
printk(KERN_WARNING "%s: BIOS configuration fixed.\n", d->name);
}
/*
* assume all devices can do 32-bit dma for now. we can add a
* dma mask field to the ide_pci_device_t if we need it (or let
* lower level driver set the dma mask)
*/
ret = pci_set_dma_mask(dev, DMA_32BIT_MASK);
if (ret < 0) {
printk(KERN_ERR "%s: can't set dma mask\n", d->name);
goto out;
}
/* FIXME: Temporary - until we put in the hotplug interface logic
Check that the bits we want are not in use by someone else. */
ret = pci_request_region(dev, 4, "ide_tmp");
if (ret < 0)
goto out;
pci_release_region(dev, 4);
out:
return ret;
}
/**
* ide_pci_configure - configure an unconfigured device
* @dev: PCI device
* @d: IDE pci device data
*
* Enable and configure the PCI device we have been passed.
* Returns zero on success or an error code.
*/
static int ide_pci_configure(struct pci_dev *dev, ide_pci_device_t *d)
{
u16 pcicmd = 0;
/*
* PnP BIOS was *supposed* to have setup this device, but we
* can do it ourselves, so long as the BIOS has assigned an IRQ
* (or possibly the device is using a "legacy header" for IRQs).
* Maybe the user deliberately *disabled* the device,
* but we'll eventually ignore it again if no drives respond.
*/
if (ide_setup_pci_baseregs(dev, d->name) || pci_write_config_word(dev, PCI_COMMAND, pcicmd|PCI_COMMAND_IO))
{
printk(KERN_INFO "%s: device disabled (BIOS)\n", d->name);
return -ENODEV;
}
if (pci_read_config_word(dev, PCI_COMMAND, &pcicmd)) {
printk(KERN_ERR "%s: error accessing PCI regs\n", d->name);
return -EIO;
}
if (!(pcicmd & PCI_COMMAND_IO)) {
printk(KERN_ERR "%s: unable to enable IDE controller\n", d->name);
return -ENXIO;
}
return 0;
}
/**
* ide_pci_check_iomem - check a register is I/O
* @dev: pci device
* @d: ide_pci_device
* @bar: bar number
*
* Checks if a BAR is configured and points to MMIO space. If so
* print an error and return an error code. Otherwise return 0
*/
static int ide_pci_check_iomem(struct pci_dev *dev, ide_pci_device_t *d, int bar)
{
ulong flags = pci_resource_flags(dev, bar);
/* Unconfigured ? */
if (!flags || pci_resource_len(dev, bar) == 0)
return 0;
/* I/O space */
if(flags & PCI_BASE_ADDRESS_IO_MASK)
return 0;
/* Bad */
printk(KERN_ERR "%s: IO baseregs (BIOS) are reported "
"as MEM, report to "
"<andre@linux-ide.org>.\n", d->name);
return -EINVAL;
}
/**
* ide_hwif_configure - configure an IDE interface
* @dev: PCI device holding interface
* @d: IDE pci data
* @mate: Paired interface if any
*
* Perform the initial set up for the hardware interface structure. This
* is done per interface port rather than per PCI device. There may be
* more than one port per device.
*
* Returns the new hardware interface structure, or NULL on a failure
*/
static ide_hwif_t *ide_hwif_configure(struct pci_dev *dev, ide_pci_device_t *d, ide_hwif_t *mate, int port, int irq)
{
unsigned long ctl = 0, base = 0;
ide_hwif_t *hwif;
if ((d->flags & IDEPCI_FLAG_ISA_PORTS) == 0) {
/* Possibly we should fail if these checks report true */
ide_pci_check_iomem(dev, d, 2*port);
ide_pci_check_iomem(dev, d, 2*port+1);
ctl = pci_resource_start(dev, 2*port+1);
base = pci_resource_start(dev, 2*port);
if ((ctl && !base) || (base && !ctl)) {
printk(KERN_ERR "%s: inconsistent baseregs (BIOS) "
"for port %d, skipping\n", d->name, port);
return NULL;
}
}
if (!ctl)
{
/* Use default values */
ctl = port ? 0x374 : 0x3f4;
base = port ? 0x170 : 0x1f0;
}
if ((hwif = ide_match_hwif(base, d->bootable, d->name)) == NULL)
return NULL; /* no room in ide_hwifs[] */
if (hwif->io_ports[IDE_DATA_OFFSET] != base ||
hwif->io_ports[IDE_CONTROL_OFFSET] != (ctl | 2)) {
memset(&hwif->hw, 0, sizeof(hwif->hw));
#ifndef IDE_ARCH_OBSOLETE_INIT
ide_std_init_ports(&hwif->hw, base, (ctl | 2));
hwif->hw.io_ports[IDE_IRQ_OFFSET] = 0;
#else
ide_init_hwif_ports(&hwif->hw, base, (ctl | 2), NULL);
#endif
memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->io_ports));
hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
}
hwif->chipset = ide_pci;
hwif->pci_dev = dev;
hwif->cds = (struct ide_pci_device_s *) d;
hwif->channel = port;
if (!hwif->irq)
hwif->irq = irq;
if (mate) {
hwif->mate = mate;
mate->mate = hwif;
}
return hwif;
}
/**
* ide_hwif_setup_dma - configure DMA interface
* @dev: PCI device
* @d: IDE pci data
* @hwif: Hardware interface we are configuring
*
* Set up the DMA base for the interface. Enable the master bits as
* necessary and attempt to bring the device DMA into a ready to use
* state
*/
#ifndef CONFIG_BLK_DEV_IDEDMA_PCI
static void ide_hwif_setup_dma(struct pci_dev *dev, ide_pci_device_t *d, ide_hwif_t *hwif)
{
}
#else
static void ide_hwif_setup_dma(struct pci_dev *dev, ide_pci_device_t *d, ide_hwif_t *hwif)
{
u16 pcicmd;
pci_read_config_word(dev, PCI_COMMAND, &pcicmd);
if ((d->autodma == AUTODMA) ||
((dev->class >> 8) == PCI_CLASS_STORAGE_IDE &&
(dev->class & 0x80))) {
unsigned long dma_base = ide_get_or_set_dma_base(hwif);
if (dma_base && !(pcicmd & PCI_COMMAND_MASTER)) {
/*
* Set up BM-DMA capability
* (PnP BIOS should have done this)
*/
/* default DMA off if we had to configure it here */
hwif->autodma = 0;
pci_set_master(dev);
if (pci_read_config_word(dev, PCI_COMMAND, &pcicmd) || !(pcicmd & PCI_COMMAND_MASTER)) {
printk(KERN_ERR "%s: %s error updating PCICMD\n",
hwif->name, d->name);
dma_base = 0;
}
}
if (dma_base) {
if (d->init_dma) {
d->init_dma(hwif, dma_base);
} else {
ide_setup_dma(hwif, dma_base, 8);
}
} else {
printk(KERN_INFO "%s: %s Bus-Master DMA disabled "
"(BIOS)\n", hwif->name, d->name);
}
}
}
#ifndef CONFIG_IDEDMA_PCI_AUTO
#warning CONFIG_IDEDMA_PCI_AUTO=n support is obsolete, and will be removed soon.
#endif
#endif /* CONFIG_BLK_DEV_IDEDMA_PCI*/
/**
* ide_setup_pci_controller - set up IDE PCI
* @dev: PCI device
* @d: IDE PCI data
* @noisy: verbose flag
* @config: returned as 1 if we configured the hardware
*
* Set up the PCI and controller side of the IDE interface. This brings
* up the PCI side of the device, checks that the device is enabled
* and enables it if need be
*/
static int ide_setup_pci_controller(struct pci_dev *dev, ide_pci_device_t *d, int noisy, int *config)
{
int ret;
u32 class_rev;
u16 pcicmd;
if (noisy)
ide_setup_pci_noise(dev, d);
ret = ide_pci_enable(dev, d);
if (ret < 0)
goto out;
ret = pci_read_config_word(dev, PCI_COMMAND, &pcicmd);
if (ret < 0) {
printk(KERN_ERR "%s: error accessing PCI regs\n", d->name);
goto out;
}
if (!(pcicmd & PCI_COMMAND_IO)) { /* is device disabled? */
ret = ide_pci_configure(dev, d);
if (ret < 0)
goto out;
*config = 1;
printk(KERN_INFO "%s: device enabled (Linux)\n", d->name);
}
pci_read_config_dword(dev, PCI_CLASS_REVISION, &class_rev);
class_rev &= 0xff;
if (noisy)
printk(KERN_INFO "%s: chipset revision %d\n", d->name, class_rev);
out:
return ret;
}
/**
* ide_pci_setup_ports - configure ports/devices on PCI IDE
* @dev: PCI device
* @d: IDE pci device info
* @pciirq: IRQ line
* @index: ata index to update
*
* Scan the interfaces attached to this device and do any
* necessary per port setup. Attach the devices and ask the
* generic DMA layer to do its work for us.
*
* Normally called automaticall from do_ide_pci_setup_device,
* but is also used directly as a helper function by some controllers
* where the chipset setup is not the default PCI IDE one.
*/
void ide_pci_setup_ports(struct pci_dev *dev, ide_pci_device_t *d, int pciirq, ata_index_t *index)
{
int port;
int at_least_one_hwif_enabled = 0;
ide_hwif_t *hwif, *mate = NULL;
u8 tmp;
index->all = 0xf0f0;
/*
* Set up the IDE ports
*/
for (port = 0; port <= 1; ++port) {
ide_pci_enablebit_t *e = &(d->enablebits[port]);
if (e->reg && (pci_read_config_byte(dev, e->reg, &tmp) ||
(tmp & e->mask) != e->val))
continue; /* port not enabled */
if (d->channels <= port)
break;
if ((hwif = ide_hwif_configure(dev, d, mate, port, pciirq)) == NULL)
continue;
/* setup proper ancestral information */
hwif->gendev.parent = &dev->dev;
if (hwif->channel) {
index->b.high = hwif->index;
} else {
index->b.low = hwif->index;
}
if (d->init_iops)
d->init_iops(hwif);
if (d->autodma == NODMA)
goto bypass_legacy_dma;
if(d->init_setup_dma)
d->init_setup_dma(dev, d, hwif);
else
ide_hwif_setup_dma(dev, d, hwif);
bypass_legacy_dma:
if (d->init_hwif)
/* Call chipset-specific routine
* for each enabled hwif
*/
d->init_hwif(hwif);
mate = hwif;
at_least_one_hwif_enabled = 1;
}
if (!at_least_one_hwif_enabled)
printk(KERN_INFO "%s: neither IDE port enabled (BIOS)\n", d->name);
}
EXPORT_SYMBOL_GPL(ide_pci_setup_ports);
/*
* ide_setup_pci_device() looks at the primary/secondary interfaces
* on a PCI IDE device and, if they are enabled, prepares the IDE driver
* for use with them. This generic code works for most PCI chipsets.
*
* One thing that is not standardized is the location of the
* primary/secondary interface "enable/disable" bits. For chipsets that
* we "know" about, this information is in the ide_pci_device_t struct;
* for all other chipsets, we just assume both interfaces are enabled.
*/
static int do_ide_setup_pci_device(struct pci_dev *dev, ide_pci_device_t *d,
ata_index_t *index, u8 noisy)
{
static ata_index_t ata_index = { .b = { .low = 0xff, .high = 0xff } };
int tried_config = 0;
int pciirq, ret;
ret = ide_setup_pci_controller(dev, d, noisy, &tried_config);
if (ret < 0)
goto out;
/*
* Can we trust the reported IRQ?
*/
pciirq = dev->irq;
/* Is it an "IDE storage" device in non-PCI mode? */
if ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE && (dev->class & 5) != 5) {
if (noisy)
printk(KERN_INFO "%s: not 100%% native mode: "
"will probe irqs later\n", d->name);
/*
* This allows offboard ide-pci cards the enable a BIOS,
* verify interrupt settings of split-mirror pci-config
* space, place chipset into init-mode, and/or preserve
* an interrupt if the card is not native ide support.
*/
ret = d->init_chipset ? d->init_chipset(dev, d->name) : 0;
if (ret < 0)
goto out;
pciirq = ret;
} else if (tried_config) {
if (noisy)
printk(KERN_INFO "%s: will probe irqs later\n", d->name);
pciirq = 0;
} else if (!pciirq) {
if (noisy)
printk(KERN_WARNING "%s: bad irq (%d): will probe later\n",
d->name, pciirq);
pciirq = 0;
} else {
if (d->init_chipset) {
ret = d->init_chipset(dev, d->name);
if (ret < 0)
goto out;
}
if (noisy)
printk(KERN_INFO "%s: 100%% native mode on irq %d\n",
d->name, pciirq);
}
/* FIXME: silent failure can happen */
*index = ata_index;
ide_pci_setup_ports(dev, d, pciirq, index);
out:
return ret;
}
int ide_setup_pci_device(struct pci_dev *dev, ide_pci_device_t *d)
{
ata_index_t index_list;
int ret;
ret = do_ide_setup_pci_device(dev, d, &index_list, 1);
if (ret < 0)
goto out;
if ((index_list.b.low & 0xf0) != 0xf0)
probe_hwif_init_with_fixup(&ide_hwifs[index_list.b.low], d->fixup);
if ((index_list.b.high & 0xf0) != 0xf0)
probe_hwif_init_with_fixup(&ide_hwifs[index_list.b.high], d->fixup);
create_proc_ide_interfaces();
out:
return ret;
}
EXPORT_SYMBOL_GPL(ide_setup_pci_device);
int ide_setup_pci_devices(struct pci_dev *dev1, struct pci_dev *dev2,
ide_pci_device_t *d)
{
struct pci_dev *pdev[] = { dev1, dev2 };
ata_index_t index_list[2];
int ret, i;
for (i = 0; i < 2; i++) {
ret = do_ide_setup_pci_device(pdev[i], d, index_list + i, !i);
/*
* FIXME: Mom, mom, they stole me the helper function to undo
* do_ide_setup_pci_device() on the first device!
*/
if (ret < 0)
goto out;
}
for (i = 0; i < 2; i++) {
u8 idx[2] = { index_list[i].b.low, index_list[i].b.high };
int j;
for (j = 0; j < 2; j++) {
if ((idx[j] & 0xf0) != 0xf0)
probe_hwif_init(ide_hwifs + idx[j]);
}
}
create_proc_ide_interfaces();
out:
return ret;
}
EXPORT_SYMBOL_GPL(ide_setup_pci_devices);
/*
* Module interfaces
*/
static int pre_init = 1; /* Before first ordered IDE scan */
static LIST_HEAD(ide_pci_drivers);
/*
* __ide_pci_register_driver - attach IDE driver
* @driver: pci driver
* @module: owner module of the driver
*
* Registers a driver with the IDE layer. The IDE layer arranges that
* boot time setup is done in the expected device order and then
* hands the controllers off to the core PCI code to do the rest of
* the work.
*
* The driver_data of the driver table must point to an ide_pci_device_t
* describing the interface.
*
* Returns are the same as for pci_register_driver
*/
int __ide_pci_register_driver(struct pci_driver *driver, struct module *module)
{
if(!pre_init)
return __pci_register_driver(driver, module);
driver->driver.owner = module;
list_add_tail(&driver->node, &ide_pci_drivers);
return 0;
}
EXPORT_SYMBOL_GPL(__ide_pci_register_driver);
/**
* ide_unregister_pci_driver - unregister an IDE driver
* @driver: driver to remove
*
* Unregister a currently installed IDE driver. Returns are the same
* as for pci_unregister_driver
*/
void ide_pci_unregister_driver(struct pci_driver *driver)
{
if(!pre_init)
pci_unregister_driver(driver);
else
list_del(&driver->node);
}
EXPORT_SYMBOL_GPL(ide_pci_unregister_driver);
/**
* ide_scan_pcidev - find an IDE driver for a device
* @dev: PCI device to check
*
* Look for an IDE driver to handle the device we are considering.
* This is only used during boot up to get the ordering correct. After
* boot up the pci layer takes over the job.
*/
static int __init ide_scan_pcidev(struct pci_dev *dev)
{
struct list_head *l;
struct pci_driver *d;
list_for_each(l, &ide_pci_drivers)
{
d = list_entry(l, struct pci_driver, node);
if(d->id_table)
{
const struct pci_device_id *id = pci_match_id(d->id_table, dev);
if(id != NULL)
{
if(d->probe(dev, id) >= 0)
{
dev->driver = d;
return 1;
}
}
}
}
return 0;
}
/**
* ide_scan_pcibus - perform the initial IDE driver scan
* @scan_direction: set for reverse order scanning
*
* Perform the initial bus rather than driver ordered scan of the
* PCI drivers. After this all IDE pci handling becomes standard
* module ordering not traditionally ordered.
*/
void __init ide_scan_pcibus (int scan_direction)
{
struct pci_dev *dev = NULL;
struct pci_driver *d;
struct list_head *l, *n;
pre_init = 0;
if (!scan_direction) {
while ((dev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
ide_scan_pcidev(dev);
}
} else {
while ((dev = pci_find_device_reverse(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
ide_scan_pcidev(dev);
}
}
/*
* Hand the drivers over to the PCI layer now we
* are post init.
*/
list_for_each_safe(l, n, &ide_pci_drivers)
{
list_del(l);
d = list_entry(l, struct pci_driver, node);
__pci_register_driver(d, d->driver.owner);
}
}
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