setup-pci.c

ep9315平台下硬盘驱动的源码

/*
 *  linux/drivers/ide/setup-pci.c		Version 1.10	2002/08/19
 *
 *  Copyright (c) 1998-2000  Andre Hedrick <[e-mail]>
 *
 *  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/config.h>
#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 <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_generic)
				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_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 __init 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) && (hwif->dma_base))
		return hwif->dma_base;

	if (hwif->mate && hwif->mate->dma_base) {
		dma_base = hwif->mate->dma_base - (hwif->channel ? 0 : 8);
	} else {
		dma_base = (hwif->mmio) ?
			((unsigned long) hwif->hwif_data) :
			(pci_resource_start(dev, 4));
		if (!dma_base) {
			printk(KERN_ERR "%s: dma_base is invalid (0x%04lx)\n",
				hwif->cds->name, dma_base);
			dma_base = 0;
		}
	}

#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:
				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? */
#if 0					
/*
 *	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.
 */
					/* Don't enable DMA on a simplex channel with no drives */
					if (!hwif->drives[0].present && !hwif->drives[1].present)
					{
						printk(KERN_INFO "%s: simplex device with no drives: DMA disabled\n",
								hwif->cds->name);
						dma_base = 0;
					}
					/* If our other channel has DMA then we cannot */
					else 
#endif					
					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;
}

static void ide_setup_pci_noise (struct pci_dev *dev, ide_pci_device_t *d)
{
	if ((d->vendor != dev->vendor) && (d->device != dev->device)) {
		printk(KERN_INFO "%s: unknown IDE controller at PCI slot "
			"%s, VID=%04x, DID=%04x\n",
			d->name, dev->slot_name, dev->vendor, dev->device);
        } else {
		printk(KERN_INFO "%s: IDE controller at PCI slot %s\n",
			d->name, dev->slot_name);
	}
}

/**
 *	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)
{
	
	if (pci_enable_device(dev)) {
		if (pci_enable_device_bars(dev, 1 << 4)) {
			printk(KERN_WARNING "%s: (ide_setup_pci_device:) "
				"Could not enable device.\n", d->name);
			return -EBUSY;
		} else
			printk(KERN_WARNING "%s: Not fully BIOS configured!\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)
	 */
	if (pci_set_dma_mask(dev, 0xffffffff)) {
		printk(KERN_ERR "%s: can't set dma mask\n", d->name);
		return -EBUSY;
	}
	 
	/* FIXME: Temporary - until we put in the hotplug interface logic
	   Check that the bits we want are not in use by someone else */
	if (pci_request_region(dev, 4, "ide_tmp"))
		return -EBUSY;
	pci_release_region(dev, 4);
	
	return 0;	
}

/**
 *	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 "
			"<[e-mail]>.\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;