Initial import of modified Linux 2.6.28 tree

Original upstream URL:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git | branch linux-2.6.28.y

1 files changed, 463 insertions, 0 deletions

diff --git a/drivers/ata/sata_vsc.c b/drivers/ata/sata_vsc.c
new file mode 100644
index 0000000..c57cdff
--- /dev/null
+++ b/drivers/ata/sata_vsc.c
@@ -0,0 +1,463 @@
+/*
+ *  sata_vsc.c - Vitesse VSC7174 4 port DPA SATA
+ *
+ *  Maintained by:  Jeremy Higdon @ SGI
+ * 		    Please ALWAYS copy linux-ide@vger.kernel.org
+ *		    on emails.
+ *
+ *  Copyright 2004 SGI
+ *
+ *  Bits from Jeff Garzik, Copyright RedHat, Inc.
+ *
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ *  libata documentation is available via 'make {ps|pdf}docs',
+ *  as Documentation/DocBook/libata.*
+ *
+ *  Vitesse hardware documentation presumably available under NDA.
+ *  Intel 31244 (same hardware interface) documentation presumably
+ *  available from http://developer.intel.com/
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/dma-mapping.h>
+#include <linux/device.h>
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+
+#define DRV_NAME	"sata_vsc"
+#define DRV_VERSION	"2.3"
+
+enum {
+	VSC_MMIO_BAR			= 0,
+
+	/* Interrupt register offsets (from chip base address) */
+	VSC_SATA_INT_STAT_OFFSET	= 0x00,
+	VSC_SATA_INT_MASK_OFFSET	= 0x04,
+
+	/* Taskfile registers offsets */
+	VSC_SATA_TF_CMD_OFFSET		= 0x00,
+	VSC_SATA_TF_DATA_OFFSET		= 0x00,
+	VSC_SATA_TF_ERROR_OFFSET	= 0x04,
+	VSC_SATA_TF_FEATURE_OFFSET	= 0x06,
+	VSC_SATA_TF_NSECT_OFFSET	= 0x08,
+	VSC_SATA_TF_LBAL_OFFSET		= 0x0c,
+	VSC_SATA_TF_LBAM_OFFSET		= 0x10,
+	VSC_SATA_TF_LBAH_OFFSET		= 0x14,
+	VSC_SATA_TF_DEVICE_OFFSET	= 0x18,
+	VSC_SATA_TF_STATUS_OFFSET	= 0x1c,
+	VSC_SATA_TF_COMMAND_OFFSET	= 0x1d,
+	VSC_SATA_TF_ALTSTATUS_OFFSET	= 0x28,
+	VSC_SATA_TF_CTL_OFFSET		= 0x29,
+
+	/* DMA base */
+	VSC_SATA_UP_DESCRIPTOR_OFFSET	= 0x64,
+	VSC_SATA_UP_DATA_BUFFER_OFFSET	= 0x6C,
+	VSC_SATA_DMA_CMD_OFFSET		= 0x70,
+
+	/* SCRs base */
+	VSC_SATA_SCR_STATUS_OFFSET	= 0x100,
+	VSC_SATA_SCR_ERROR_OFFSET	= 0x104,
+	VSC_SATA_SCR_CONTROL_OFFSET	= 0x108,
+
+	/* Port stride */
+	VSC_SATA_PORT_OFFSET		= 0x200,
+
+	/* Error interrupt status bit offsets */
+	VSC_SATA_INT_ERROR_CRC		= 0x40,
+	VSC_SATA_INT_ERROR_T		= 0x20,
+	VSC_SATA_INT_ERROR_P		= 0x10,
+	VSC_SATA_INT_ERROR_R		= 0x8,
+	VSC_SATA_INT_ERROR_E		= 0x4,
+	VSC_SATA_INT_ERROR_M		= 0x2,
+	VSC_SATA_INT_PHY_CHANGE		= 0x1,
+	VSC_SATA_INT_ERROR = (VSC_SATA_INT_ERROR_CRC  | VSC_SATA_INT_ERROR_T | \
+			      VSC_SATA_INT_ERROR_P    | VSC_SATA_INT_ERROR_R | \
+			      VSC_SATA_INT_ERROR_E    | VSC_SATA_INT_ERROR_M | \
+			      VSC_SATA_INT_PHY_CHANGE),
+};
+
+static int vsc_sata_scr_read(struct ata_link *link,
+			     unsigned int sc_reg, u32 *val)
+{
+	if (sc_reg > SCR_CONTROL)
+		return -EINVAL;
+	*val = readl(link->ap->ioaddr.scr_addr + (sc_reg * 4));
+	return 0;
+}
+
+
+static int vsc_sata_scr_write(struct ata_link *link,
+			      unsigned int sc_reg, u32 val)
+{
+	if (sc_reg > SCR_CONTROL)
+		return -EINVAL;
+	writel(val, link->ap->ioaddr.scr_addr + (sc_reg * 4));
+	return 0;
+}
+
+
+static void vsc_freeze(struct ata_port *ap)
+{
+	void __iomem *mask_addr;
+
+	mask_addr = ap->host->iomap[VSC_MMIO_BAR] +
+		VSC_SATA_INT_MASK_OFFSET + ap->port_no;
+
+	writeb(0, mask_addr);
+}
+
+
+static void vsc_thaw(struct ata_port *ap)
+{
+	void __iomem *mask_addr;
+
+	mask_addr = ap->host->iomap[VSC_MMIO_BAR] +
+		VSC_SATA_INT_MASK_OFFSET + ap->port_no;
+
+	writeb(0xff, mask_addr);
+}
+
+
+static void vsc_intr_mask_update(struct ata_port *ap, u8 ctl)
+{
+	void __iomem *mask_addr;
+	u8 mask;
+
+	mask_addr = ap->host->iomap[VSC_MMIO_BAR] +
+		VSC_SATA_INT_MASK_OFFSET + ap->port_no;
+	mask = readb(mask_addr);
+	if (ctl & ATA_NIEN)
+		mask |= 0x80;
+	else
+		mask &= 0x7F;
+	writeb(mask, mask_addr);
+}
+
+
+static void vsc_sata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
+{
+	struct ata_ioports *ioaddr = &ap->ioaddr;
+	unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
+
+	/*
+	 * The only thing the ctl register is used for is SRST.
+	 * That is not enabled or disabled via tf_load.
+	 * However, if ATA_NIEN is changed, then we need to change
+	 * the interrupt register.
+	 */
+	if ((tf->ctl & ATA_NIEN) != (ap->last_ctl & ATA_NIEN)) {
+		ap->last_ctl = tf->ctl;
+		vsc_intr_mask_update(ap, tf->ctl & ATA_NIEN);
+	}
+	if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
+		writew(tf->feature | (((u16)tf->hob_feature) << 8),
+		       ioaddr->feature_addr);
+		writew(tf->nsect | (((u16)tf->hob_nsect) << 8),
+		       ioaddr->nsect_addr);
+		writew(tf->lbal | (((u16)tf->hob_lbal) << 8),
+		       ioaddr->lbal_addr);
+		writew(tf->lbam | (((u16)tf->hob_lbam) << 8),
+		       ioaddr->lbam_addr);
+		writew(tf->lbah | (((u16)tf->hob_lbah) << 8),
+		       ioaddr->lbah_addr);
+	} else if (is_addr) {
+		writew(tf->feature, ioaddr->feature_addr);
+		writew(tf->nsect, ioaddr->nsect_addr);
+		writew(tf->lbal, ioaddr->lbal_addr);
+		writew(tf->lbam, ioaddr->lbam_addr);
+		writew(tf->lbah, ioaddr->lbah_addr);
+	}
+
+	if (tf->flags & ATA_TFLAG_DEVICE)
+		writeb(tf->device, ioaddr->device_addr);
+
+	ata_wait_idle(ap);
+}
+
+
+static void vsc_sata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
+{
+	struct ata_ioports *ioaddr = &ap->ioaddr;
+	u16 nsect, lbal, lbam, lbah, feature;
+
+	tf->command = ata_sff_check_status(ap);
+	tf->device = readw(ioaddr->device_addr);
+	feature = readw(ioaddr->error_addr);
+	nsect = readw(ioaddr->nsect_addr);
+	lbal = readw(ioaddr->lbal_addr);
+	lbam = readw(ioaddr->lbam_addr);
+	lbah = readw(ioaddr->lbah_addr);
+
+	tf->feature = feature;
+	tf->nsect = nsect;
+	tf->lbal = lbal;
+	tf->lbam = lbam;
+	tf->lbah = lbah;
+
+	if (tf->flags & ATA_TFLAG_LBA48) {
+		tf->hob_feature = feature >> 8;
+		tf->hob_nsect = nsect >> 8;
+		tf->hob_lbal = lbal >> 8;
+		tf->hob_lbam = lbam >> 8;
+		tf->hob_lbah = lbah >> 8;
+	}
+}
+
+static inline void vsc_error_intr(u8 port_status, struct ata_port *ap)
+{
+	if (port_status & (VSC_SATA_INT_PHY_CHANGE | VSC_SATA_INT_ERROR_M))
+		ata_port_freeze(ap);
+	else
+		ata_port_abort(ap);
+}
+
+static void vsc_port_intr(u8 port_status, struct ata_port *ap)
+{
+	struct ata_queued_cmd *qc;
+	int handled = 0;
+
+	if (unlikely(port_status & VSC_SATA_INT_ERROR)) {
+		vsc_error_intr(port_status, ap);
+		return;
+	}
+
+	qc = ata_qc_from_tag(ap, ap->link.active_tag);
+	if (qc && likely(!(qc->tf.flags & ATA_TFLAG_POLLING)))
+		handled = ata_sff_host_intr(ap, qc);
+
+	/* We received an interrupt during a polled command,
+	 * or some other spurious condition.  Interrupt reporting
+	 * with this hardware is fairly reliable so it is safe to
+	 * simply clear the interrupt
+	 */
+	if (unlikely(!handled))
+		ap->ops->sff_check_status(ap);
+}
+
+/*
+ * vsc_sata_interrupt
+ *
+ * Read the interrupt register and process for the devices that have
+ * them pending.
+ */
+static irqreturn_t vsc_sata_interrupt(int irq, void *dev_instance)
+{
+	struct ata_host *host = dev_instance;
+	unsigned int i;
+	unsigned int handled = 0;
+	u32 status;
+
+	status = readl(host->iomap[VSC_MMIO_BAR] + VSC_SATA_INT_STAT_OFFSET);
+
+	if (unlikely(status == 0xffffffff || status == 0)) {
+		if (status)
+			dev_printk(KERN_ERR, host->dev,
+				": IRQ status == 0xffffffff, "
+				"PCI fault or device removal?\n");
+		goto out;
+	}
+
+	spin_lock(&host->lock);
+
+	for (i = 0; i < host->n_ports; i++) {
+		u8 port_status = (status >> (8 * i)) & 0xff;
+		if (port_status) {
+			struct ata_port *ap = host->ports[i];
+
+			if (ap && !(ap->flags & ATA_FLAG_DISABLED)) {
+				vsc_port_intr(port_status, ap);
+				handled++;
+			} else
+				dev_printk(KERN_ERR, host->dev,
+					"interrupt from disabled port %d\n", i);
+		}
+	}
+
+	spin_unlock(&host->lock);
+out:
+	return IRQ_RETVAL(handled);
+}
+
+
+static struct scsi_host_template vsc_sata_sht = {
+	ATA_BMDMA_SHT(DRV_NAME),
+};
+
+
+static struct ata_port_operations vsc_sata_ops = {
+	.inherits		= &ata_bmdma_port_ops,
+	.sff_tf_load		= vsc_sata_tf_load,
+	.sff_tf_read		= vsc_sata_tf_read,
+	.freeze			= vsc_freeze,
+	.thaw			= vsc_thaw,
+	.scr_read		= vsc_sata_scr_read,
+	.scr_write		= vsc_sata_scr_write,
+};
+
+static void __devinit vsc_sata_setup_port(struct ata_ioports *port,
+					  void __iomem *base)
+{
+	port->cmd_addr		= base + VSC_SATA_TF_CMD_OFFSET;
+	port->data_addr		= base + VSC_SATA_TF_DATA_OFFSET;
+	port->error_addr	= base + VSC_SATA_TF_ERROR_OFFSET;
+	port->feature_addr	= base + VSC_SATA_TF_FEATURE_OFFSET;
+	port->nsect_addr	= base + VSC_SATA_TF_NSECT_OFFSET;
+	port->lbal_addr		= base + VSC_SATA_TF_LBAL_OFFSET;
+	port->lbam_addr		= base + VSC_SATA_TF_LBAM_OFFSET;
+	port->lbah_addr		= base + VSC_SATA_TF_LBAH_OFFSET;
+	port->device_addr	= base + VSC_SATA_TF_DEVICE_OFFSET;
+	port->status_addr	= base + VSC_SATA_TF_STATUS_OFFSET;
+	port->command_addr	= base + VSC_SATA_TF_COMMAND_OFFSET;
+	port->altstatus_addr	= base + VSC_SATA_TF_ALTSTATUS_OFFSET;
+	port->ctl_addr		= base + VSC_SATA_TF_CTL_OFFSET;
+	port->bmdma_addr	= base + VSC_SATA_DMA_CMD_OFFSET;
+	port->scr_addr		= base + VSC_SATA_SCR_STATUS_OFFSET;
+	writel(0, base + VSC_SATA_UP_DESCRIPTOR_OFFSET);
+	writel(0, base + VSC_SATA_UP_DATA_BUFFER_OFFSET);
+}
+
+
+static int __devinit vsc_sata_init_one(struct pci_dev *pdev,
+				       const struct pci_device_id *ent)
+{
+	static const struct ata_port_info pi = {
+		.flags		= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+				  ATA_FLAG_MMIO,
+		.pio_mask	= 0x1f,
+		.mwdma_mask	= 0x07,
+		.udma_mask	= ATA_UDMA6,
+		.port_ops	= &vsc_sata_ops,
+	};
+	const struct ata_port_info *ppi[] = { &pi, NULL };
+	static int printed_version;
+	struct ata_host *host;
+	void __iomem *mmio_base;
+	int i, rc;
+	u8 cls;
+
+	if (!printed_version++)
+		dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
+
+	/* allocate host */
+	host = ata_host_alloc_pinfo(&pdev->dev, ppi, 4);
+	if (!host)
+		return -ENOMEM;
+
+	rc = pcim_enable_device(pdev);
+	if (rc)
+		return rc;
+
+	/* check if we have needed resource mapped */
+	if (pci_resource_len(pdev, 0) == 0)
+		return -ENODEV;
+
+	/* map IO regions and intialize host accordingly */
+	rc = pcim_iomap_regions(pdev, 1 << VSC_MMIO_BAR, DRV_NAME);
+	if (rc == -EBUSY)
+		pcim_pin_device(pdev);
+	if (rc)
+		return rc;
+	host->iomap = pcim_iomap_table(pdev);
+
+	mmio_base = host->iomap[VSC_MMIO_BAR];
+
+	for (i = 0; i < host->n_ports; i++) {
+		struct ata_port *ap = host->ports[i];
+		unsigned int offset = (i + 1) * VSC_SATA_PORT_OFFSET;
+
+		vsc_sata_setup_port(&ap->ioaddr, mmio_base + offset);
+
+		ata_port_pbar_desc(ap, VSC_MMIO_BAR, -1, "mmio");
+		ata_port_pbar_desc(ap, VSC_MMIO_BAR, offset, "port");
+	}
+
+	/*
+	 * Use 32 bit DMA mask, because 64 bit address support is poor.
+	 */
+	rc = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
+	if (rc)
+		return rc;
+	rc = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
+	if (rc)
+		return rc;
+
+	/*
+	 * Due to a bug in the chip, the default cache line size can't be
+	 * used (unless the default is non-zero).
+	 */
+	pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &cls);
+	if (cls == 0x00)
+		pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, 0x80);
+
+	if (pci_enable_msi(pdev) == 0)
+		pci_intx(pdev, 0);
+
+	/*
+	 * Config offset 0x98 is "Extended Control and Status Register 0"
+	 * Default value is (1 << 28).  All bits except bit 28 are reserved in
+	 * DPA mode.  If bit 28 is set, LED 0 reflects all ports' activity.
+	 * If bit 28 is clear, each port has its own LED.
+	 */
+	pci_write_config_dword(pdev, 0x98, 0);
+
+	pci_set_master(pdev);
+	return ata_host_activate(host, pdev->irq, vsc_sata_interrupt,
+				 IRQF_SHARED, &vsc_sata_sht);
+}
+
+static const struct pci_device_id vsc_sata_pci_tbl[] = {
+	{ PCI_VENDOR_ID_VITESSE, 0x7174,
+	  PCI_ANY_ID, PCI_ANY_ID, 0x10600, 0xFFFFFF, 0 },
+	{ PCI_VENDOR_ID_INTEL, 0x3200,
+	  PCI_ANY_ID, PCI_ANY_ID, 0x10600, 0xFFFFFF, 0 },
+
+	{ }	/* terminate list */
+};
+
+static struct pci_driver vsc_sata_pci_driver = {
+	.name			= DRV_NAME,
+	.id_table		= vsc_sata_pci_tbl,
+	.probe			= vsc_sata_init_one,
+	.remove			= ata_pci_remove_one,
+};
+
+static int __init vsc_sata_init(void)
+{
+	return pci_register_driver(&vsc_sata_pci_driver);
+}
+
+static void __exit vsc_sata_exit(void)
+{
+	pci_unregister_driver(&vsc_sata_pci_driver);
+}
+
+MODULE_AUTHOR("Jeremy Higdon");
+MODULE_DESCRIPTION("low-level driver for Vitesse VSC7174 SATA controller");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, vsc_sata_pci_tbl);
+MODULE_VERSION(DRV_VERSION);
+
+module_init(vsc_sata_init);
+module_exit(vsc_sata_exit);