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linux-sg2042/drivers/ata/sata_vsc.c

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/*
* 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_port *ap, unsigned int sc_reg, u32 *val)
{
if (sc_reg > SCR_CONTROL)
return -EINVAL;
*val = readl(ap->ioaddr.scr_addr + (sc_reg * 4));
return 0;
}
static int vsc_sata_scr_write(struct ata_port *ap, unsigned int sc_reg, u32 val)
{
if (sc_reg > SCR_CONTROL)
return -EINVAL;
writel(val, 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);
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