Initial import

1 files changed, 258 insertions, 0 deletions

diff --git a/drivers/ata/ata_generic.c b/drivers/ata/ata_generic.c
new file mode 100644
index 000000000..9ff545ce8
--- /dev/null
+++ b/drivers/ata/ata_generic.c
@@ -0,0 +1,258 @@
+/*
+ *  ata_generic.c - Generic PATA/SATA controller driver.
+ *  Copyright 2005 Red Hat Inc, all rights reserved.
+ *
+ *  Elements from ide/pci/generic.c
+ *	    Copyright (C) 2001-2002	Andre Hedrick <andre@linux-ide.org>
+ *	    Portions (C) Copyright 2002  Red Hat Inc <alan@redhat.com>
+ *
+ *  May be copied or modified under the terms of the GNU General Public License
+ *
+ *  Driver for PCI IDE interfaces implementing the standard bus mastering
+ *  interface functionality. This assumes the BIOS did the drive set up and
+ *  tuning for us. By default we do not grab all IDE class devices as they
+ *  may have other drivers or need fixups to avoid problems. Instead we keep
+ *  a default list of stuff without documentation/driver that appears to
+ *  work.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+
+#define DRV_NAME "ata_generic"
+#define DRV_VERSION "0.2.15"
+
+/*
+ *	A generic parallel ATA driver using libata
+ */
+
+enum {
+	ATA_GEN_CLASS_MATCH		= (1 << 0),
+	ATA_GEN_FORCE_DMA		= (1 << 1),
+	ATA_GEN_INTEL_IDER		= (1 << 2),
+};
+
+/**
+ *	generic_set_mode	-	mode setting
+ *	@link: link to set up
+ *	@unused: returned device on error
+ *
+ *	Use a non standard set_mode function. We don't want to be tuned.
+ *	The BIOS configured everything. Our job is not to fiddle. We
+ *	read the dma enabled bits from the PCI configuration of the device
+ *	and respect them.
+ */
+
+static int generic_set_mode(struct ata_link *link, struct ata_device **unused)
+{
+	struct ata_port *ap = link->ap;
+	const struct pci_device_id *id = ap->host->private_data;
+	int dma_enabled = 0;
+	struct ata_device *dev;
+
+	if (id->driver_data & ATA_GEN_FORCE_DMA) {
+		dma_enabled = 0xff;
+	} else if (ap->ioaddr.bmdma_addr) {
+		/* Bits 5 and 6 indicate if DMA is active on master/slave */
+		dma_enabled = ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
+	}
+
+	ata_for_each_dev(dev, link, ENABLED) {
+		/* We don't really care */
+		dev->pio_mode = XFER_PIO_0;
+		dev->dma_mode = XFER_MW_DMA_0;
+		/* We do need the right mode information for DMA or PIO
+		   and this comes from the current configuration flags */
+		if (dma_enabled & (1 << (5 + dev->devno))) {
+			unsigned int xfer_mask = ata_id_xfermask(dev->id);
+			const char *name;
+
+			if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
+				name = ata_mode_string(xfer_mask);
+			else {
+				/* SWDMA perhaps? */
+				name = "DMA";
+				xfer_mask |= ata_xfer_mode2mask(XFER_MW_DMA_0);
+			}
+
+			ata_dev_info(dev, "configured for %s\n", name);
+
+			dev->xfer_mode = ata_xfer_mask2mode(xfer_mask);
+			dev->xfer_shift = ata_xfer_mode2shift(dev->xfer_mode);
+			dev->flags &= ~ATA_DFLAG_PIO;
+		} else {
+			ata_dev_info(dev, "configured for PIO\n");
+			dev->xfer_mode = XFER_PIO_0;
+			dev->xfer_shift = ATA_SHIFT_PIO;
+			dev->flags |= ATA_DFLAG_PIO;
+		}
+	}
+	return 0;
+}
+
+static struct scsi_host_template generic_sht = {
+	ATA_BMDMA_SHT(DRV_NAME),
+};
+
+static struct ata_port_operations generic_port_ops = {
+	.inherits	= &ata_bmdma_port_ops,
+	.cable_detect	= ata_cable_unknown,
+	.set_mode	= generic_set_mode,
+};
+
+static int all_generic_ide;		/* Set to claim all devices */
+
+/**
+ *	is_intel_ider		-	identify intel IDE-R devices
+ *	@dev: PCI device
+ *
+ *	Distinguish Intel IDE-R controller devices from other Intel IDE
+ *	devices. IDE-R devices have no timing registers and are in
+ *	most respects virtual. They should be driven by the ata_generic
+ *	driver.
+ *
+ *	IDE-R devices have PCI offset 0xF8.L as zero, later Intel ATA has
+ *	it non zero. All Intel ATA has 0x40 writable (timing), but it is
+ *	not writable on IDE-R devices (this is guaranteed).
+ */
+
+static int is_intel_ider(struct pci_dev *dev)
+{
+	/* For Intel IDE the value at 0xF8 is only zero on IDE-R
+	   interfaces */
+	u32 r;
+	u16 t;
+
+	/* Check the manufacturing ID, it will be zero for IDE-R */
+	pci_read_config_dword(dev, 0xF8, &r);
+	/* Not IDE-R: punt so that ata_(old)piix gets it */
+	if (r != 0)
+		return 0;
+	/* 0xF8 will also be zero on some early Intel IDE devices
+	   but they will have a sane timing register */
+	pci_read_config_word(dev, 0x40, &t);
+	if (t != 0)
+		return 0;
+	/* Finally check if the timing register is writable so that
+	   we eliminate any early devices hot-docked in a docking
+	   station */
+	pci_write_config_word(dev, 0x40, 1);
+	pci_read_config_word(dev, 0x40, &t);
+	if (t) {
+		pci_write_config_word(dev, 0x40, 0);
+		return 0;
+	}
+	return 1;
+}
+
+/**
+ *	ata_generic_init		-	attach generic IDE
+ *	@dev: PCI device found
+ *	@id: match entry
+ *
+ *	Called each time a matching IDE interface is found. We check if the
+ *	interface is one we wish to claim and if so we perform any chip
+ *	specific hacks then let the ATA layer do the heavy lifting.
+ */
+
+static int ata_generic_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+	u16 command;
+	static const struct ata_port_info info = {
+		.flags = ATA_FLAG_SLAVE_POSS,
+		.pio_mask = ATA_PIO4,
+		.mwdma_mask = ATA_MWDMA2,
+		.udma_mask = ATA_UDMA5,
+		.port_ops = &generic_port_ops
+	};
+	const struct ata_port_info *ppi[] = { &info, NULL };
+
+	/* Don't use the generic entry unless instructed to do so */
+	if ((id->driver_data & ATA_GEN_CLASS_MATCH) && all_generic_ide == 0)
+		return -ENODEV;
+
+	if ((id->driver_data & ATA_GEN_INTEL_IDER) && !all_generic_ide)
+		if (!is_intel_ider(dev))
+			return -ENODEV;
+
+	/* Devices that need care */
+	if (dev->vendor == PCI_VENDOR_ID_UMC &&
+	    dev->device == PCI_DEVICE_ID_UMC_UM8886A &&
+	    (!(PCI_FUNC(dev->devfn) & 1)))
+		return -ENODEV;
+
+	if (dev->vendor == PCI_VENDOR_ID_OPTI &&
+	    dev->device == PCI_DEVICE_ID_OPTI_82C558 &&
+	    (!(PCI_FUNC(dev->devfn) & 1)))
+		return -ENODEV;
+
+	/* Don't re-enable devices in generic mode or we will break some
+	   motherboards with disabled and unused IDE controllers */
+	pci_read_config_word(dev, PCI_COMMAND, &command);
+	if (!(command & PCI_COMMAND_IO))
+		return -ENODEV;
+
+	if (dev->vendor == PCI_VENDOR_ID_AL)
+		ata_pci_bmdma_clear_simplex(dev);
+
+	if (dev->vendor == PCI_VENDOR_ID_ATI) {
+		int rc = pcim_enable_device(dev);
+		if (rc < 0)
+			return rc;
+		pcim_pin_device(dev);
+	}
+	return ata_pci_bmdma_init_one(dev, ppi, &generic_sht, (void *)id, 0);
+}
+
+static struct pci_device_id ata_generic[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_SAMURAI_IDE), },
+	{ PCI_DEVICE(PCI_VENDOR_ID_HOLTEK, PCI_DEVICE_ID_HOLTEK_6565), },
+	{ PCI_DEVICE(PCI_VENDOR_ID_UMC,    PCI_DEVICE_ID_UMC_UM8673F), },
+	{ PCI_DEVICE(PCI_VENDOR_ID_UMC,    PCI_DEVICE_ID_UMC_UM8886A), },
+	{ PCI_DEVICE(PCI_VENDOR_ID_UMC,    PCI_DEVICE_ID_UMC_UM8886BF), },
+	{ PCI_DEVICE(PCI_VENDOR_ID_HINT,   PCI_DEVICE_ID_HINT_VXPROII_IDE), },
+	{ PCI_DEVICE(PCI_VENDOR_ID_VIA,    PCI_DEVICE_ID_VIA_82C561), },
+	{ PCI_DEVICE(PCI_VENDOR_ID_OPTI,   PCI_DEVICE_ID_OPTI_82C558), },
+	{ PCI_DEVICE(PCI_VENDOR_ID_CENATEK,PCI_DEVICE_ID_CENATEK_IDE),
+	  .driver_data = ATA_GEN_FORCE_DMA },
+#if !defined(CONFIG_PATA_TOSHIBA) && !defined(CONFIG_PATA_TOSHIBA_MODULE)
+	{ PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_1), },
+	{ PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_2),  },
+	{ PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_3),  },
+	{ PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA,PCI_DEVICE_ID_TOSHIBA_PICCOLO_5),  },
+#endif
+	/* Intel, IDE class device */
+	{ PCI_VENDOR_ID_INTEL, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
+	  PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL,
+	  .driver_data = ATA_GEN_INTEL_IDER },
+	/* Must come last. If you add entries adjust this table appropriately */
+	{ PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL),
+	  .driver_data = ATA_GEN_CLASS_MATCH },
+	{ 0, },
+};
+
+static struct pci_driver ata_generic_pci_driver = {
+	.name 		= DRV_NAME,
+	.id_table	= ata_generic,
+	.probe 		= ata_generic_init_one,
+	.remove		= ata_pci_remove_one,
+#ifdef CONFIG_PM_SLEEP
+	.suspend	= ata_pci_device_suspend,
+	.resume		= ata_pci_device_resume,
+#endif
+};
+
+module_pci_driver(ata_generic_pci_driver);
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("low-level driver for generic ATA");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, ata_generic);
+MODULE_VERSION(DRV_VERSION);
+
+module_param(all_generic_ide, int, 0);