// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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 .
*
* libata documentation is available via ' make { ps | pdf } docs ' ,
* as Documentation / driver - api / libata . rst
*
* 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/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 = 0 x00,
VSC_SATA_INT_MASK_OFFSET = 0 x04,
/* Taskfile registers offsets */
VSC_SATA_TF_CMD_OFFSET = 0 x00,
VSC_SATA_TF_DATA_OFFSET = 0 x00,
VSC_SATA_TF_ERROR_OFFSET = 0 x04,
VSC_SATA_TF_FEATURE_OFFSET = 0 x06,
VSC_SATA_TF_NSECT_OFFSET = 0 x08,
VSC_SATA_TF_LBAL_OFFSET = 0 x0c,
VSC_SATA_TF_LBAM_OFFSET = 0 x10,
VSC_SATA_TF_LBAH_OFFSET = 0 x14,
VSC_SATA_TF_DEVICE_OFFSET = 0 x18,
VSC_SATA_TF_STATUS_OFFSET = 0 x1c,
VSC_SATA_TF_COMMAND_OFFSET = 0 x1d,
VSC_SATA_TF_ALTSTATUS_OFFSET = 0 x28,
VSC_SATA_TF_CTL_OFFSET = 0 x29,
/* DMA base */
VSC_SATA_UP_DESCRIPTOR_OFFSET = 0 x64,
VSC_SATA_UP_DATA_BUFFER_OFFSET = 0 x6C,
VSC_SATA_DMA_CMD_OFFSET = 0 x70,
/* SCRs base */
VSC_SATA_SCR_STATUS_OFFSET = 0 x100,
VSC_SATA_SCR_ERROR_OFFSET = 0 x104,
VSC_SATA_SCR_CONTROL_OFFSET = 0 x108,
/* Port stride */
VSC_SATA_PORT_OFFSET = 0 x200,
/* Error interrupt status bit offsets */
VSC_SATA_INT_ERROR_CRC = 0 x40,
VSC_SATA_INT_ERROR_T = 0 x20,
VSC_SATA_INT_ERROR_P = 0 x10,
VSC_SATA_INT_ERROR_R = 0 x8,
VSC_SATA_INT_ERROR_E = 0 x4,
VSC_SATA_INT_ERROR_M = 0 x2,
VSC_SATA_INT_PHY_CHANGE = 0 x1,
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(0 xff, 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 |= 0 x80;
else
mask &= 0 x7F;
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, error;
tf->status = ata_sff_check_status(ap);
tf->device = readw(ioaddr->device_addr);
error = 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->error = error;
tf->nsect = nsect;
tf->lbal = lbal;
tf->lbam = lbam;
tf->lbah = lbah;
if (tf->flags & ATA_TFLAG_LBA48) {
tf->hob_feature = error >> 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_bmdma_port_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 == 0 xffffffff || status == 0 )) {
if (status)
dev_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)) & 0 xff;
if (port_status) {
vsc_port_intr(port_status, host->ports[i]);
handled++;
}
}
spin_unlock(&host->lock);
out:
return IRQ_RETVAL(handled);
}
static const 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,
/* The IRQ handling is not quite standard SFF behaviour so we
cannot use the default lost interrupt handler */
.lost_interrupt = ATA_OP_NULL,
.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 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 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,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA6,
.port_ops = &vsc_sata_ops,
};
const struct ata_port_info *ppi[] = { &pi, NULL };
struct ata_host *host;
void __iomem *mmio_base;
int i, rc;
u8 cls;
ata_print_version_once(&pdev->dev, DRV_VERSION);
/* 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 initialize 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 = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32 ));
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 == 0 x00)
pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, 0 x80);
if (pci_enable_msi(pdev) == 0 )
pcim_intx(pdev, 0 );
/*
* Config offset 0 x98 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, 0 x98, 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, 0 x7174,
PCI_ANY_ID, PCI_ANY_ID, 0 x10600, 0 xFFFFFF, 0 },
{ PCI_VENDOR_ID_INTEL, 0 x3200,
PCI_ANY_ID, PCI_ANY_ID, 0 x10600, 0 xFFFFFF, 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,
};
module_pci_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);
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