/*
* 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 "1.0"
/* 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 __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 (ap && !(ap->flags &
(ATA_FLAG_PORT_DISABLED|ATA_FLAG_NOINTR))) {
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 struct scsi_host_template vsc_sata_sht = {
.module = THIS_MODULE,
.name = DRV_NAME,
.ioctl = ata_scsi_ioctl,
.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,
.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,
.bios_param = ata_std_bios_param,
.ordered_flush = 1,
};
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,
.phy_reset = sata_phy_reset,
.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,
.eng_timeout = ata_eng_timeout,
.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 | 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->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;
}
/*
* 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 const 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)
{
return pci_module_init(&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);
