1 files changed, 482 insertions, 0 deletions

diff --git a/drivers/ata/sata_vsc.c b/drivers/ata/sata_vsc.c
new file mode 100644
index 000000000000..4c69a705a483
--- /dev/null
+++ b/drivers/ata/sata_vsc.c
@@ -0,0 +1,482 @@
+/*
+ *  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	"2.0"
+
+enum {
+	/* 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),
+};
+
+
+#define is_vsc_sata_int_err(port_idx, int_status) \
+	 (int_status & (VSC_SATA_INT_ERROR << (8 * port_idx)))
+
+
+static u32 vsc_sata_scr_read (struct ata_port *ap, unsigned int sc_reg)
+{
+	if (sc_reg > SCR_CONTROL)
+		return 0xffffffffU;
+	return readl((void __iomem *) ap->ioaddr.scr_addr + (sc_reg * 4));
+}
+
+
+static void vsc_sata_scr_write (struct ata_port *ap, unsigned int sc_reg,
+			       u32 val)
+{
+	if (sc_reg > SCR_CONTROL)
+		return;
+	writel(val, (void __iomem *) ap->ioaddr.scr_addr + (sc_reg * 4));
+}
+
+
+static void vsc_intr_mask_update(struct ata_port *ap, u8 ctl)
+{
+	void __iomem *mask_addr;
+	u8 mask;
+
+	mask_addr = ap->host_set->mmio_base +
+		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_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;
+        }
+}
+
+
+/*
+ * 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 pt_regs *regs)
+{
+	struct ata_host_set *host_set = dev_instance;
+	unsigned int i;
+	unsigned int handled = 0;
+	u32 int_status;
+
+	spin_lock(&host_set->lock);
+
+	int_status = readl(host_set->mmio_base + VSC_SATA_INT_STAT_OFFSET);
+
+	for (i = 0; i < host_set->n_ports; i++) {
+		if (int_status & ((u32) 0xFF << (8 * i))) {
+			struct ata_port *ap;
+
+			ap = host_set->ports[i];
+
+			if (is_vsc_sata_int_err(i, int_status)) {
+				u32 err_status;
+				printk(KERN_DEBUG "%s: ignoring interrupt(s)\n", __FUNCTION__);
+				err_status = ap ? vsc_sata_scr_read(ap, SCR_ERROR) : 0;
+				vsc_sata_scr_write(ap, SCR_ERROR, err_status);
+				handled++;
+			}
+
+			if (ap && !(ap->flags & ATA_FLAG_DISABLED)) {
+				struct ata_queued_cmd *qc;
+
+				qc = ata_qc_from_tag(ap, ap->active_tag);
+				if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)))
+					handled += ata_host_intr(ap, qc);
+				else if (is_vsc_sata_int_err(i, int_status)) {
+					/*
+					 * On some chips (i.e. Intel 31244), an error
+					 * interrupt will sneak in at initialization
+					 * time (phy state changes).  Clearing the SCR
+					 * error register is not required, but it prevents
+					 * the phy state change interrupts from recurring
+					 * later.
+					 */
+					u32 err_status;
+					err_status = vsc_sata_scr_read(ap, SCR_ERROR);
+					printk(KERN_DEBUG "%s: clearing interrupt, "
+					       "status %x; sata err status %x\n",
+					       __FUNCTION__,
+					       int_status, err_status);
+					vsc_sata_scr_write(ap, SCR_ERROR, err_status);
+					/* Clear interrupt status */
+					ata_chk_status(ap);
+					handled++;
+				}
+			}
+		}
+	}
+
+	spin_unlock(&host_set->lock);
+
+	return IRQ_RETVAL(handled);
+}
+
+
+static struct scsi_host_template vsc_sata_sht = {
+	.module			= THIS_MODULE,
+	.name			= DRV_NAME,
+	.ioctl			= ata_scsi_ioctl,
+	.queuecommand		= ata_scsi_queuecmd,
+	.can_queue		= ATA_DEF_QUEUE,
+	.this_id		= ATA_SHT_THIS_ID,
+	.sg_tablesize		= LIBATA_MAX_PRD,
+	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
+	.emulated		= ATA_SHT_EMULATED,
+	.use_clustering		= ATA_SHT_USE_CLUSTERING,
+	.proc_name		= DRV_NAME,
+	.dma_boundary		= ATA_DMA_BOUNDARY,
+	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
+	.bios_param		= ata_std_bios_param,
+};
+
+
+static const struct ata_port_operations vsc_sata_ops = {
+	.port_disable		= ata_port_disable,
+	.tf_load		= vsc_sata_tf_load,
+	.tf_read		= vsc_sata_tf_read,
+	.exec_command		= ata_exec_command,
+	.check_status		= ata_check_status,
+	.dev_select		= ata_std_dev_select,
+	.bmdma_setup            = ata_bmdma_setup,
+	.bmdma_start            = ata_bmdma_start,
+	.bmdma_stop		= ata_bmdma_stop,
+	.bmdma_status		= ata_bmdma_status,
+	.qc_prep		= ata_qc_prep,
+	.qc_issue		= ata_qc_issue_prot,
+	.data_xfer		= ata_mmio_data_xfer,
+	.freeze			= ata_bmdma_freeze,
+	.thaw			= ata_bmdma_thaw,
+	.error_handler		= ata_bmdma_error_handler,
+	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
+	.irq_handler		= vsc_sata_interrupt,
+	.irq_clear		= ata_bmdma_irq_clear,
+	.scr_read		= vsc_sata_scr_read,
+	.scr_write		= vsc_sata_scr_write,
+	.port_start		= ata_port_start,
+	.port_stop		= ata_port_stop,
+	.host_stop		= ata_pci_host_stop,
+};
+
+static void __devinit vsc_sata_setup_port(struct ata_ioports *port, unsigned long 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 int printed_version;
+	struct ata_probe_ent *probe_ent = NULL;
+	unsigned long base;
+	int pci_dev_busy = 0;
+	void __iomem *mmio_base;
+	int rc;
+
+	if (!printed_version++)
+		dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
+
+	rc = pci_enable_device(pdev);
+	if (rc)
+		return rc;
+
+	/*
+	 * Check if we have needed resource mapped.
+	 */
+	if (pci_resource_len(pdev, 0) == 0) {
+		rc = -ENODEV;
+		goto err_out;
+	}
+
+	rc = pci_request_regions(pdev, DRV_NAME);
+	if (rc) {
+		pci_dev_busy = 1;
+		goto err_out;
+	}
+
+	/*
+	 * Use 32 bit DMA mask, because 64 bit address support is poor.
+	 */
+	rc = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
+	if (rc)
+		goto err_out_regions;
+	rc = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
+	if (rc)
+		goto err_out_regions;
+
+	probe_ent = kmalloc(sizeof(*probe_ent), GFP_KERNEL);
+	if (probe_ent == NULL) {
+		rc = -ENOMEM;
+		goto err_out_regions;
+	}
+	memset(probe_ent, 0, sizeof(*probe_ent));
+	probe_ent->dev = pci_dev_to_dev(pdev);
+	INIT_LIST_HEAD(&probe_ent->node);
+
+	mmio_base = pci_iomap(pdev, 0, 0);
+	if (mmio_base == NULL) {
+		rc = -ENOMEM;
+		goto err_out_free_ent;
+	}
+	base = (unsigned long) mmio_base;
+
+	/*
+	 * Due to a bug in the chip, the default cache line size can't be used
+	 */
+	pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, 0x80);
+
+	probe_ent->sht = &vsc_sata_sht;
+	probe_ent->host_flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+				ATA_FLAG_MMIO;
+	probe_ent->port_ops = &vsc_sata_ops;
+	probe_ent->n_ports = 4;
+	probe_ent->irq = pdev->irq;
+	probe_ent->irq_flags = IRQF_SHARED;
+	probe_ent->mmio_base = mmio_base;
+
+	/* We don't care much about the PIO/UDMA masks, but the core won't like us
+	 * if we don't fill these
+	 */
+	probe_ent->pio_mask = 0x1f;
+	probe_ent->mwdma_mask = 0x07;
+	probe_ent->udma_mask = 0x7f;
+
+	/* We have 4 ports per PCI function */
+	vsc_sata_setup_port(&probe_ent->port[0], base + 1 * VSC_SATA_PORT_OFFSET);
+	vsc_sata_setup_port(&probe_ent->port[1], base + 2 * VSC_SATA_PORT_OFFSET);
+	vsc_sata_setup_port(&probe_ent->port[2], base + 3 * VSC_SATA_PORT_OFFSET);
+	vsc_sata_setup_port(&probe_ent->port[3], base + 4 * VSC_SATA_PORT_OFFSET);
+
+	pci_set_master(pdev);
+
+	/*
+	 * 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);
+
+	/* FIXME: check ata_device_add return value */
+	ata_device_add(probe_ent);
+	kfree(probe_ent);
+
+	return 0;
+
+err_out_free_ent:
+	kfree(probe_ent);
+err_out_regions:
+	pci_release_regions(pdev);
+err_out:
+	if (!pci_dev_busy)
+		pci_disable_device(pdev);
+	return rc;
+}
+
+
+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);