patch-2.4.27 linux-2.4.27/drivers/scsi/sata_vsc.c

• Lines: 402
• Date: 2004-08-07 16:26:05.533382896 -0700
• Orig file: linux-2.4.26/drivers/scsi/sata_vsc.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.26/drivers/scsi/sata_vsc.c linux-2.4.27/drivers/scsi/sata_vsc.c
@@ -0,0 +1,401 @@
+/*
+ *  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 file is subject to the terms and conditions of the GNU General Public
+ *  License.  See the file "COPYING" in the main directory of this archive
+ *  for more details.
+ */
+
+#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 "scsi.h"
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+
+#define DRV_NAME	"sata_vsc"
+#define DRV_VERSION	"0.01"
+
+/* Interrupt register offsets (from chip base address) */
+#define VSC_SATA_INT_STAT_OFFSET	0x00
+#define VSC_SATA_INT_MASK_OFFSET	0x04
+
+/* Taskfile registers offsets */
+#define VSC_SATA_TF_CMD_OFFSET		0x00
+#define VSC_SATA_TF_DATA_OFFSET		0x00
+#define VSC_SATA_TF_ERROR_OFFSET	0x04
+#define VSC_SATA_TF_FEATURE_OFFSET	0x06
+#define VSC_SATA_TF_NSECT_OFFSET	0x08
+#define VSC_SATA_TF_LBAL_OFFSET		0x0c
+#define VSC_SATA_TF_LBAM_OFFSET		0x10
+#define VSC_SATA_TF_LBAH_OFFSET		0x14
+#define VSC_SATA_TF_DEVICE_OFFSET	0x18
+#define VSC_SATA_TF_STATUS_OFFSET	0x1c
+#define VSC_SATA_TF_COMMAND_OFFSET	0x1d
+#define VSC_SATA_TF_ALTSTATUS_OFFSET	0x28
+#define VSC_SATA_TF_CTL_OFFSET		0x29
+
+/* DMA base */
+#define VSC_SATA_UP_DESCRIPTOR_OFFSET	0x64
+#define VSC_SATA_UP_DATA_BUFFER_OFFSET	0x6C
+#define VSC_SATA_DMA_CMD_OFFSET		0x70
+
+/* SCRs base */
+#define VSC_SATA_SCR_STATUS_OFFSET	0x100
+#define VSC_SATA_SCR_ERROR_OFFSET	0x104
+#define VSC_SATA_SCR_CONTROL_OFFSET	0x108
+
+/* Port stride */
+#define VSC_SATA_PORT_OFFSET		0x200
+
+
+static u32 vsc_sata_scr_read (struct ata_port *ap, unsigned int sc_reg)
+{
+	if (sc_reg > SCR_CONTROL)
+		return 0xffffffffU;
+	return readl((void *) 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 *) ap->ioaddr.scr_addr + (sc_reg * 4));
+}
+
+
+static void vsc_intr_mask_update(struct ata_port *ap, u8 ctl)
+{
+	unsigned long mask_addr;
+	u8 mask;
+
+	mask_addr = (unsigned long) 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, 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;
+
+	nsect = tf->nsect = readw(ioaddr->nsect_addr);
+	lbal = tf->lbal = readw(ioaddr->lbal_addr);
+	lbam = tf->lbam = readw(ioaddr->lbam_addr);
+	lbah = tf->lbah = readw(ioaddr->lbah_addr);
+	tf->device = readw(ioaddr->device_addr);
+
+	if (tf->flags & ATA_TFLAG_LBA48) {
+		tf->hob_feature = readb(ioaddr->error_addr);
+		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.
+ */
+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 (ap && (!(ap->flags & ATA_FLAG_PORT_DISABLED))) {
+				struct ata_queued_cmd *qc;
+
+				qc = ata_qc_from_tag(ap, ap->active_tag);
+				if (qc && (!(qc->tf.ctl & ATA_NIEN)))
+					handled += ata_host_intr(ap, qc);
+			}
+		}
+	}
+
+	spin_unlock(&host_set->lock);
+
+	return IRQ_RETVAL(handled);
+}
+
+
+static Scsi_Host_Template vsc_sata_sht = {
+	.module			= THIS_MODULE,
+	.name			= DRV_NAME,
+	.detect			= ata_scsi_detect,
+	.release		= ata_scsi_release,
+	.queuecommand		= ata_scsi_queuecmd,
+	.eh_strategy_handler	= ata_scsi_error,
+	.can_queue		= ATA_DEF_QUEUE,
+	.this_id		= ATA_SHT_THIS_ID,
+	.sg_tablesize		= LIBATA_MAX_PRD,
+	.max_sectors		= ATA_MAX_SECTORS,
+	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
+	.use_new_eh_code	= ATA_SHT_NEW_EH_CODE,
+	.emulated		= ATA_SHT_EMULATED,
+	.use_clustering		= ATA_SHT_USE_CLUSTERING,
+	.proc_name		= DRV_NAME,
+	.bios_param		= ata_std_bios_param,
+};
+
+
+static 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_mmio,
+	.check_status		= ata_check_status_mmio,
+	.phy_reset		= sata_phy_reset,
+	.bmdma_setup            = ata_bmdma_setup_mmio,
+	.bmdma_start            = ata_bmdma_start_mmio,
+	.fill_sg		= ata_fill_sg,
+	.eng_timeout		= ata_eng_timeout,
+	.irq_handler		= vsc_sata_interrupt,
+	.scr_read		= vsc_sata_scr_read,
+	.scr_write		= vsc_sata_scr_write,
+	.port_start		= ata_port_start,
+	.port_stop		= ata_port_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;
+	void *mmio_base;
+	int rc;
+
+	if (!printed_version++)
+		printk(KERN_DEBUG DRV_NAME " 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)
+		goto err_out;
+
+	/*
+	 * Use 32 bit DMA mask, because 64 bit address support is poor.
+	 */
+	rc = pci_set_dma_mask(pdev, 0xFFFFFFFFULL);
+	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->pdev = pdev;
+	INIT_LIST_HEAD(&probe_ent->node);
+
+	mmio_base = ioremap(pci_resource_start(pdev, 0),
+		            pci_resource_len(pdev, 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 | ATA_FLAG_SATA_RESET;
+	probe_ent->port_ops = &vsc_sata_ops;
+	probe_ent->n_ports = 4;
+	probe_ent->irq = pdev->irq;
+	probe_ent->irq_flags = SA_SHIRQ;
+	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->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);
+
+	ata_add_to_probe_list(probe_ent);
+
+	return 0;
+
+err_out_free_ent:
+	kfree(probe_ent);
+err_out_regions:
+	pci_release_regions(pdev);
+err_out:
+	pci_disable_device(pdev);
+	return rc;
+}
+
+
+/*
+ * 0x1725/0x7174 is the Vitesse VSC-7174
+ * 0x8086/0x3200 is the Intel 31244, which is supposed to be identical
+ * compatibility is untested as of yet
+ */
+static struct pci_device_id vsc_sata_pci_tbl[] = {
+	{ 0x1725, 0x7174, PCI_ANY_ID, PCI_ANY_ID, 0x10600, 0xFFFFFF, 0 },
+	{ 0x8086, 0x3200, PCI_ANY_ID, PCI_ANY_ID, 0x10600, 0xFFFFFF, 0 },
+	{ }
+};
+
+
+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)
+{
+	int rc;
+
+	DPRINTK("pci_module_init\n");
+	rc = pci_module_init(&vsc_sata_pci_driver);
+	if (rc)
+		return rc;
+
+	DPRINTK("scsi_register_host\n");
+	rc = scsi_register_module(MODULE_SCSI_HA, &vsc_sata_sht);
+	if (rc) {
+		rc = -ENODEV;
+		goto err_out;
+	}
+
+	DPRINTK("done\n");
+	return 0;
+
+err_out:
+	pci_unregister_driver(&vsc_sata_pci_driver);
+	return rc;
+}
+
+
+static void __exit vsc_sata_exit(void)
+{
+	scsi_unregister_module(MODULE_SCSI_HA, &vsc_sata_sht);
+	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_init(vsc_sata_init);
+module_exit(vsc_sata_exit);