1 files changed, 682 insertions, 0 deletions

diff --git a/drivers/ide/setup-pci.c b/drivers/ide/setup-pci.c
new file mode 100644
index 000000000..fdc8e8131
--- /dev/null
+++ b/drivers/ide/setup-pci.c
@@ -0,0 +1,682 @@
+/*
+ *  Copyright (C) 1998-2000  Andre Hedrick <andre@linux-ide.org>
+ *  Copyright (C) 1995-1998  Mark Lord
+ *  Copyright (C) 2007-2009  Bartlomiej Zolnierkiewicz
+ *
+ *  May be copied or modified under the terms of the GNU General Public License
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/ide.h>
+#include <linux/dma-mapping.h>
+
+#include <asm/io.h>
+
+/**
+ *	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 %s: device not capable of full "
+				"native PCI mode\n", name, pci_name(dev));
+			return -EOPNOTSUPP;
+		}
+		printk(KERN_INFO "%s %s: placing both ports into native PCI "
+			"mode\n", name, pci_name(dev));
+		(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 %s: rewrite of PROGIF failed, "
+				"wanted 0x%04x, got 0x%04x\n",
+				name, pci_name(dev), progif | 5, progif);
+			return -EOPNOTSUPP;
+		}
+	}
+	return 0;
+}
+
+#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
+static int ide_pci_clear_simplex(unsigned long dma_base, const char *name)
+{
+	u8 dma_stat = inb(dma_base + 2);
+
+	outb(dma_stat & 0x60, dma_base + 2);
+	dma_stat = inb(dma_base + 2);
+
+	return (dma_stat & 0x80) ? 1 : 0;
+}
+
+/**
+ *	ide_pci_dma_base	-	setup BMIBA
+ *	@hwif: IDE interface
+ *	@d: IDE port info
+ *
+ *	Fetch the DMA Bus-Master-I/O-Base-Address (BMIBA) from PCI space.
+ */
+
+unsigned long ide_pci_dma_base(ide_hwif_t *hwif, const struct ide_port_info *d)
+{
+	struct pci_dev *dev = to_pci_dev(hwif->dev);
+	unsigned long dma_base = 0;
+
+	if (hwif->host_flags & IDE_HFLAG_MMIO)
+		return hwif->dma_base;
+
+	if (hwif->mate && hwif->mate->dma_base) {
+		dma_base = hwif->mate->dma_base - (hwif->channel ? 0 : 8);
+	} else {
+		u8 baridx = (d->host_flags & IDE_HFLAG_CS5520) ? 2 : 4;
+
+		dma_base = pci_resource_start(dev, baridx);
+
+		if (dma_base == 0) {
+			printk(KERN_ERR "%s %s: DMA base is invalid\n",
+				d->name, pci_name(dev));
+			return 0;
+		}
+	}
+
+	if (hwif->channel)
+		dma_base += 8;
+
+	return dma_base;
+}
+EXPORT_SYMBOL_GPL(ide_pci_dma_base);
+
+int ide_pci_check_simplex(ide_hwif_t *hwif, const struct ide_port_info *d)
+{
+	struct pci_dev *dev = to_pci_dev(hwif->dev);
+	u8 dma_stat;
+
+	if (d->host_flags & (IDE_HFLAG_MMIO | IDE_HFLAG_CS5520))
+		goto out;
+
+	if (d->host_flags & IDE_HFLAG_CLEAR_SIMPLEX) {
+		if (ide_pci_clear_simplex(hwif->dma_base, d->name))
+			printk(KERN_INFO "%s %s: simplex device: DMA forced\n",
+				d->name, pci_name(dev));
+		goto out;
+	}
+
+	/*
+	 * If the device claims "simplex" DMA, this means that 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).
+	 *
+	 * FIXME: 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.
+	 */
+	dma_stat = hwif->dma_ops->dma_sff_read_status(hwif);
+	if ((dma_stat & 0x80) && hwif->mate && hwif->mate->dma_base) {
+		printk(KERN_INFO "%s %s: simplex device: DMA disabled\n",
+			d->name, pci_name(dev));
+		return -1;
+	}
+out:
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ide_pci_check_simplex);
+
+/*
+ * Set up BM-DMA capability (PnP BIOS should have done this)
+ */
+int ide_pci_set_master(struct pci_dev *dev, const char *name)
+{
+	u16 pcicmd;
+
+	pci_read_config_word(dev, PCI_COMMAND, &pcicmd);
+
+	if ((pcicmd & PCI_COMMAND_MASTER) == 0) {
+		pci_set_master(dev);
+
+		if (pci_read_config_word(dev, PCI_COMMAND, &pcicmd) ||
+		    (pcicmd & PCI_COMMAND_MASTER) == 0) {
+			printk(KERN_ERR "%s %s: error updating PCICMD\n",
+				name, pci_name(dev));
+			return -EIO;
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ide_pci_set_master);
+#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
+
+void ide_setup_pci_noise(struct pci_dev *dev, const struct ide_port_info *d)
+{
+	printk(KERN_INFO "%s %s: IDE controller (0x%04x:0x%04x rev 0x%02x)\n",
+		d->name, pci_name(dev),
+		dev->vendor, dev->device, dev->revision);
+}
+EXPORT_SYMBOL_GPL(ide_setup_pci_noise);
+
+
+/**
+ *	ide_pci_enable	-	do PCI enables
+ *	@dev: PCI device
+ *	@bars: PCI BARs mask
+ *	@d: IDE port info
+ *
+ *	Enable the IDE PCI device. We attempt to enable the device in full
+ *	but if that fails then we only need IO space. The PCI code should
+ *	have setup the proper resources for us already for controllers in
+ *	legacy mode.
+ *
+ *	Returns zero on success or an error code
+ */
+
+static int ide_pci_enable(struct pci_dev *dev, int bars,
+			  const struct ide_port_info *d)
+{
+	int ret;
+
+	if (pci_enable_device(dev)) {
+		ret = pci_enable_device_io(dev);
+		if (ret < 0) {
+			printk(KERN_WARNING "%s %s: couldn't enable device\n",
+				d->name, pci_name(dev));
+			goto out;
+		}
+		printk(KERN_WARNING "%s %s: BIOS configuration fixed\n",
+			d->name, pci_name(dev));
+	}
+
+	/*
+	 * assume all devices can do 32-bit DMA for now, we can add
+	 * a DMA mask field to the struct ide_port_info if we need it
+	 * (or let lower level driver set the DMA mask)
+	 */
+	ret = dma_set_mask(&dev->dev, DMA_BIT_MASK(32));
+	if (ret < 0) {
+		printk(KERN_ERR "%s %s: can't set DMA mask\n",
+			d->name, pci_name(dev));
+		goto out;
+	}
+
+	ret = pci_request_selected_regions(dev, bars, d->name);
+	if (ret < 0)
+		printk(KERN_ERR "%s %s: can't reserve resources\n",
+			d->name, pci_name(dev));
+out:
+	return ret;
+}
+
+/**
+ *	ide_pci_configure	-	configure an unconfigured device
+ *	@dev: PCI device
+ *	@d: IDE port info
+ *
+ *	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, const struct ide_port_info *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 %s: device disabled (BIOS)\n",
+			d->name, pci_name(dev));
+		return -ENODEV;
+	}
+	if (pci_read_config_word(dev, PCI_COMMAND, &pcicmd)) {
+		printk(KERN_ERR "%s %s: error accessing PCI regs\n",
+			d->name, pci_name(dev));
+		return -EIO;
+	}
+	if (!(pcicmd & PCI_COMMAND_IO)) {
+		printk(KERN_ERR "%s %s: unable to enable IDE controller\n",
+			d->name, pci_name(dev));
+		return -ENXIO;
+	}
+	return 0;
+}
+
+/**
+ *	ide_pci_check_iomem	-	check a register is I/O
+ *	@dev: PCI device
+ *	@d: IDE port info
+ *	@bar: BAR number
+ *
+ *	Checks if a BAR is configured and points to MMIO space. If so,
+ *	return an error code. Otherwise return 0
+ */
+
+static int ide_pci_check_iomem(struct pci_dev *dev, const struct ide_port_info *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 & IORESOURCE_IO)
+		return 0;
+
+	/* Bad */
+	return -EINVAL;
+}
+
+/**
+ *	ide_hw_configure	-	configure a struct ide_hw instance
+ *	@dev: PCI device holding interface
+ *	@d: IDE port info
+ *	@port: port number
+ *	@hw: struct ide_hw instance corresponding to this port
+ *
+ *	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 zero on success or an error code.
+ */
+
+static int ide_hw_configure(struct pci_dev *dev, const struct ide_port_info *d,
+			    unsigned int port, struct ide_hw *hw)
+{
+	unsigned long ctl = 0, base = 0;
+
+	if ((d->host_flags & IDE_HFLAG_ISA_PORTS) == 0) {
+		if (ide_pci_check_iomem(dev, d, 2 * port) ||
+		    ide_pci_check_iomem(dev, d, 2 * port + 1)) {
+			printk(KERN_ERR "%s %s: I/O baseregs (BIOS) are "
+				"reported as MEM for port %d!\n",
+				d->name, pci_name(dev), port);
+			return -EINVAL;
+		}
+
+		ctl  = pci_resource_start(dev, 2*port+1);
+		base = pci_resource_start(dev, 2*port);
+	} else {
+		/* Use default values */
+		ctl = port ? 0x374 : 0x3f4;
+		base = port ? 0x170 : 0x1f0;
+	}
+
+	if (!base || !ctl) {
+		printk(KERN_ERR "%s %s: bad PCI BARs for port %d, skipping\n",
+			d->name, pci_name(dev), port);
+		return -EINVAL;
+	}
+
+	memset(hw, 0, sizeof(*hw));
+	hw->dev = &dev->dev;
+	ide_std_init_ports(hw, base, ctl | 2);
+
+	return 0;
+}
+
+#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
+/**
+ *	ide_hwif_setup_dma	-	configure DMA interface
+ *	@hwif: IDE interface
+ *	@d: IDE port info
+ *
+ *	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
+ */
+
+int ide_hwif_setup_dma(ide_hwif_t *hwif, const struct ide_port_info *d)
+{
+	struct pci_dev *dev = to_pci_dev(hwif->dev);
+
+	if ((d->host_flags & IDE_HFLAG_NO_AUTODMA) == 0 ||
+	    ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE &&
+	     (dev->class & 0x80))) {
+		unsigned long base = ide_pci_dma_base(hwif, d);
+
+		if (base == 0)
+			return -1;
+
+		hwif->dma_base = base;
+
+		if (hwif->dma_ops == NULL)
+			hwif->dma_ops = &sff_dma_ops;
+
+		if (ide_pci_check_simplex(hwif, d) < 0)
+			return -1;
+
+		if (ide_pci_set_master(dev, d->name) < 0)
+			return -1;
+
+		if (hwif->host_flags & IDE_HFLAG_MMIO)
+			printk(KERN_INFO "    %s: MMIO-DMA\n", hwif->name);
+		else
+			printk(KERN_INFO "    %s: BM-DMA at 0x%04lx-0x%04lx\n",
+					 hwif->name, base, base + 7);
+
+		hwif->extra_base = base + (hwif->channel ? 8 : 16);
+
+		if (ide_allocate_dma_engine(hwif))
+			return -1;
+	}
+
+	return 0;
+}
+#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
+
+/**
+ *	ide_setup_pci_controller	-	set up IDE PCI
+ *	@dev: PCI device
+ *	@bars: PCI BARs mask
+ *	@d: IDE port info
+ *	@noisy: verbose flag
+ *
+ *	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, int bars,
+				    const struct ide_port_info *d, int noisy)
+{
+	int ret;
+	u16 pcicmd;
+
+	if (noisy)
+		ide_setup_pci_noise(dev, d);
+
+	ret = ide_pci_enable(dev, bars, d);
+	if (ret < 0)
+		goto out;
+
+	ret = pci_read_config_word(dev, PCI_COMMAND, &pcicmd);
+	if (ret < 0) {
+		printk(KERN_ERR "%s %s: error accessing PCI regs\n",
+			d->name, pci_name(dev));
+		goto out_free_bars;
+	}
+	if (!(pcicmd & PCI_COMMAND_IO)) {	/* is device disabled? */
+		ret = ide_pci_configure(dev, d);
+		if (ret < 0)
+			goto out_free_bars;
+		printk(KERN_INFO "%s %s: device enabled (Linux)\n",
+			d->name, pci_name(dev));
+	}
+
+	goto out;
+
+out_free_bars:
+	pci_release_selected_regions(dev, bars);
+out:
+	return ret;
+}
+
+/**
+ *	ide_pci_setup_ports	-	configure ports/devices on PCI IDE
+ *	@dev: PCI device
+ *	@d: IDE port info
+ *	@hw: struct ide_hw instances corresponding to this PCI IDE device
+ *	@hws: struct ide_hw pointers table 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, const struct ide_port_info *d,
+			 struct ide_hw *hw, struct ide_hw **hws)
+{
+	int channels = (d->host_flags & IDE_HFLAG_SINGLE) ? 1 : 2, port;
+	u8 tmp;
+
+	/*
+	 * Set up the IDE ports
+	 */
+
+	for (port = 0; port < channels; ++port) {
+		const struct ide_pci_enablebit *e = &d->enablebits[port];
+
+		if (e->reg && (pci_read_config_byte(dev, e->reg, &tmp) ||
+		    (tmp & e->mask) != e->val)) {
+			printk(KERN_INFO "%s %s: IDE port disabled\n",
+				d->name, pci_name(dev));
+			continue;	/* port not enabled */
+		}
+
+		if (ide_hw_configure(dev, d, port, hw + port))
+			continue;
+
+		*(hws + port) = hw + port;
+	}
+}
+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 struct ide_port_info;
+ * for all other chipsets, we just assume both interfaces are enabled.
+ */
+static int do_ide_setup_pci_device(struct pci_dev *dev,
+				   const struct ide_port_info *d,
+				   u8 noisy)
+{
+	int pciirq, ret;
+
+	/*
+	 * Can we trust the reported IRQ?
+	 */
+	pciirq = dev->irq;
+
+	/*
+	 * 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) : 0;
+	if (ret < 0)
+		goto out;
+
+	if (ide_pci_is_in_compatibility_mode(dev)) {
+		if (noisy)
+			printk(KERN_INFO "%s %s: not 100%% native mode: will "
+				"probe irqs later\n", d->name, pci_name(dev));
+		pciirq = 0;
+	} else if (!pciirq && noisy) {
+		printk(KERN_WARNING "%s %s: bad irq (%d): will probe later\n",
+			d->name, pci_name(dev), pciirq);
+	} else if (noisy) {
+		printk(KERN_INFO "%s %s: 100%% native mode on irq %d\n",
+			d->name, pci_name(dev), pciirq);
+	}
+
+	ret = pciirq;
+out:
+	return ret;
+}
+
+int ide_pci_init_two(struct pci_dev *dev1, struct pci_dev *dev2,
+		     const struct ide_port_info *d, void *priv)
+{
+	struct pci_dev *pdev[] = { dev1, dev2 };
+	struct ide_host *host;
+	int ret, i, n_ports = dev2 ? 4 : 2, bars;
+	struct ide_hw hw[4], *hws[] = { NULL, NULL, NULL, NULL };
+
+	if (d->host_flags & IDE_HFLAG_SINGLE)
+		bars = (1 << 2) - 1;
+	else
+		bars = (1 << 4) - 1;
+
+	if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
+		if (d->host_flags & IDE_HFLAG_CS5520)
+			bars |= (1 << 2);
+		else
+			bars |= (1 << 4);
+	}
+
+	for (i = 0; i < n_ports / 2; i++) {
+		ret = ide_setup_pci_controller(pdev[i], bars, d, !i);
+		if (ret < 0) {
+			if (i == 1)
+				pci_release_selected_regions(pdev[0], bars);
+			goto out;
+		}
+
+		ide_pci_setup_ports(pdev[i], d, &hw[i*2], &hws[i*2]);
+	}
+
+	host = ide_host_alloc(d, hws, n_ports);
+	if (host == NULL) {
+		ret = -ENOMEM;
+		goto out_free_bars;
+	}
+
+	host->dev[0] = &dev1->dev;
+	if (dev2)
+		host->dev[1] = &dev2->dev;
+
+	host->host_priv = priv;
+	host->irq_flags = IRQF_SHARED;
+
+	pci_set_drvdata(pdev[0], host);
+	if (dev2)
+		pci_set_drvdata(pdev[1], host);
+
+	for (i = 0; i < n_ports / 2; i++) {
+		ret = do_ide_setup_pci_device(pdev[i], d, !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_free_bars;
+
+		/* fixup IRQ */
+		if (ide_pci_is_in_compatibility_mode(pdev[i])) {
+			hw[i*2].irq = pci_get_legacy_ide_irq(pdev[i], 0);
+			hw[i*2 + 1].irq = pci_get_legacy_ide_irq(pdev[i], 1);
+		} else
+			hw[i*2 + 1].irq = hw[i*2].irq = ret;
+	}
+
+	ret = ide_host_register(host, d, hws);
+	if (ret)
+		ide_host_free(host);
+	else
+		goto out;
+
+out_free_bars:
+	i = n_ports / 2;
+	while (i--)
+		pci_release_selected_regions(pdev[i], bars);
+out:
+	return ret;
+}
+EXPORT_SYMBOL_GPL(ide_pci_init_two);
+
+int ide_pci_init_one(struct pci_dev *dev, const struct ide_port_info *d,
+		     void *priv)
+{
+	return ide_pci_init_two(dev, NULL, d, priv);
+}
+EXPORT_SYMBOL_GPL(ide_pci_init_one);
+
+void ide_pci_remove(struct pci_dev *dev)
+{
+	struct ide_host *host = pci_get_drvdata(dev);
+	struct pci_dev *dev2 = host->dev[1] ? to_pci_dev(host->dev[1]) : NULL;
+	int bars;
+
+	if (host->host_flags & IDE_HFLAG_SINGLE)
+		bars = (1 << 2) - 1;
+	else
+		bars = (1 << 4) - 1;
+
+	if ((host->host_flags & IDE_HFLAG_NO_DMA) == 0) {
+		if (host->host_flags & IDE_HFLAG_CS5520)
+			bars |= (1 << 2);
+		else
+			bars |= (1 << 4);
+	}
+
+	ide_host_remove(host);
+
+	if (dev2)
+		pci_release_selected_regions(dev2, bars);
+	pci_release_selected_regions(dev, bars);
+
+	if (dev2)
+		pci_disable_device(dev2);
+	pci_disable_device(dev);
+}
+EXPORT_SYMBOL_GPL(ide_pci_remove);
+
+#ifdef CONFIG_PM
+int ide_pci_suspend(struct pci_dev *dev, pm_message_t state)
+{
+	pci_save_state(dev);
+	pci_disable_device(dev);
+	pci_set_power_state(dev, pci_choose_state(dev, state));
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ide_pci_suspend);
+
+int ide_pci_resume(struct pci_dev *dev)
+{
+	struct ide_host *host = pci_get_drvdata(dev);
+	int rc;
+
+	pci_set_power_state(dev, PCI_D0);
+
+	rc = pci_enable_device(dev);
+	if (rc)
+		return rc;
+
+	pci_restore_state(dev);
+	pci_set_master(dev);
+
+	if (host->init_chipset)
+		host->init_chipset(dev);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ide_pci_resume);
+#endif