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-rw-r--r--drivers/ata/sata_via.c758
1 files changed, 758 insertions, 0 deletions
diff --git a/drivers/ata/sata_via.c b/drivers/ata/sata_via.c
new file mode 100644
index 000000000..c7891cc84
--- /dev/null
+++ b/drivers/ata/sata_via.c
@@ -0,0 +1,758 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * sata_via.c - VIA Serial ATA controllers
+ *
+ * Maintained by: Tejun Heo <tj@kernel.org>
+ * Please ALWAYS copy linux-ide@vger.kernel.org
+ * on emails.
+ *
+ * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
+ * Copyright 2003-2004 Jeff Garzik
+ *
+ * libata documentation is available via 'make {ps|pdf}docs',
+ * as Documentation/driver-api/libata.rst
+ *
+ * Hardware documentation available under NDA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+
+#define DRV_NAME "sata_via"
+#define DRV_VERSION "2.6"
+
+/*
+ * vt8251 is different from other sata controllers of VIA. It has two
+ * channels, each channel has both Master and Slave slot.
+ */
+enum board_ids_enum {
+ vt6420,
+ vt6421,
+ vt8251,
+};
+
+enum {
+ SATA_CHAN_ENAB = 0x40, /* SATA channel enable */
+ SATA_INT_GATE = 0x41, /* SATA interrupt gating */
+ SATA_NATIVE_MODE = 0x42, /* Native mode enable */
+ SVIA_MISC_3 = 0x46, /* Miscellaneous Control III */
+ PATA_UDMA_TIMING = 0xB3, /* PATA timing for DMA/ cable detect */
+ PATA_PIO_TIMING = 0xAB, /* PATA timing register */
+
+ PORT0 = (1 << 1),
+ PORT1 = (1 << 0),
+ ALL_PORTS = PORT0 | PORT1,
+
+ NATIVE_MODE_ALL = (1 << 7) | (1 << 6) | (1 << 5) | (1 << 4),
+
+ SATA_EXT_PHY = (1 << 6), /* 0==use PATA, 1==ext phy */
+
+ SATA_HOTPLUG = (1 << 5), /* enable IRQ on hotplug */
+};
+
+struct svia_priv {
+ bool wd_workaround;
+};
+
+static int vt6420_hotplug;
+module_param_named(vt6420_hotplug, vt6420_hotplug, int, 0644);
+MODULE_PARM_DESC(vt6420_hotplug, "Enable hot-plug support for VT6420 (0=Don't support, 1=support)");
+
+static int svia_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
+#ifdef CONFIG_PM_SLEEP
+static int svia_pci_device_resume(struct pci_dev *pdev);
+#endif
+static int svia_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
+static int svia_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
+static int vt8251_scr_read(struct ata_link *link, unsigned int scr, u32 *val);
+static int vt8251_scr_write(struct ata_link *link, unsigned int scr, u32 val);
+static void svia_tf_load(struct ata_port *ap, const struct ata_taskfile *tf);
+static void svia_noop_freeze(struct ata_port *ap);
+static int vt6420_prereset(struct ata_link *link, unsigned long deadline);
+static void vt6420_bmdma_start(struct ata_queued_cmd *qc);
+static int vt6421_pata_cable_detect(struct ata_port *ap);
+static void vt6421_set_pio_mode(struct ata_port *ap, struct ata_device *adev);
+static void vt6421_set_dma_mode(struct ata_port *ap, struct ata_device *adev);
+static void vt6421_error_handler(struct ata_port *ap);
+
+static const struct pci_device_id svia_pci_tbl[] = {
+ { PCI_VDEVICE(VIA, 0x5337), vt6420 },
+ { PCI_VDEVICE(VIA, 0x0591), vt6420 }, /* 2 sata chnls (Master) */
+ { PCI_VDEVICE(VIA, 0x3149), vt6420 }, /* 2 sata chnls (Master) */
+ { PCI_VDEVICE(VIA, 0x3249), vt6421 }, /* 2 sata chnls, 1 pata chnl */
+ { PCI_VDEVICE(VIA, 0x5372), vt6420 },
+ { PCI_VDEVICE(VIA, 0x7372), vt6420 },
+ { PCI_VDEVICE(VIA, 0x5287), vt8251 }, /* 2 sata chnls (Master/Slave) */
+ { PCI_VDEVICE(VIA, 0x9000), vt8251 },
+
+ { } /* terminate list */
+};
+
+static struct pci_driver svia_pci_driver = {
+ .name = DRV_NAME,
+ .id_table = svia_pci_tbl,
+ .probe = svia_init_one,
+#ifdef CONFIG_PM_SLEEP
+ .suspend = ata_pci_device_suspend,
+ .resume = svia_pci_device_resume,
+#endif
+ .remove = ata_pci_remove_one,
+};
+
+static struct scsi_host_template svia_sht = {
+ ATA_BMDMA_SHT(DRV_NAME),
+};
+
+static struct ata_port_operations svia_base_ops = {
+ .inherits = &ata_bmdma_port_ops,
+ .sff_tf_load = svia_tf_load,
+};
+
+static struct ata_port_operations vt6420_sata_ops = {
+ .inherits = &svia_base_ops,
+ .freeze = svia_noop_freeze,
+ .prereset = vt6420_prereset,
+ .bmdma_start = vt6420_bmdma_start,
+};
+
+static struct ata_port_operations vt6421_pata_ops = {
+ .inherits = &svia_base_ops,
+ .cable_detect = vt6421_pata_cable_detect,
+ .set_piomode = vt6421_set_pio_mode,
+ .set_dmamode = vt6421_set_dma_mode,
+};
+
+static struct ata_port_operations vt6421_sata_ops = {
+ .inherits = &svia_base_ops,
+ .scr_read = svia_scr_read,
+ .scr_write = svia_scr_write,
+ .error_handler = vt6421_error_handler,
+};
+
+static struct ata_port_operations vt8251_ops = {
+ .inherits = &svia_base_ops,
+ .hardreset = sata_std_hardreset,
+ .scr_read = vt8251_scr_read,
+ .scr_write = vt8251_scr_write,
+};
+
+static const struct ata_port_info vt6420_port_info = {
+ .flags = ATA_FLAG_SATA,
+ .pio_mask = ATA_PIO4,
+ .mwdma_mask = ATA_MWDMA2,
+ .udma_mask = ATA_UDMA6,
+ .port_ops = &vt6420_sata_ops,
+};
+
+static const struct ata_port_info vt6421_sport_info = {
+ .flags = ATA_FLAG_SATA,
+ .pio_mask = ATA_PIO4,
+ .mwdma_mask = ATA_MWDMA2,
+ .udma_mask = ATA_UDMA6,
+ .port_ops = &vt6421_sata_ops,
+};
+
+static const struct ata_port_info vt6421_pport_info = {
+ .flags = ATA_FLAG_SLAVE_POSS,
+ .pio_mask = ATA_PIO4,
+ /* No MWDMA */
+ .udma_mask = ATA_UDMA6,
+ .port_ops = &vt6421_pata_ops,
+};
+
+static const struct ata_port_info vt8251_port_info = {
+ .flags = ATA_FLAG_SATA | ATA_FLAG_SLAVE_POSS,
+ .pio_mask = ATA_PIO4,
+ .mwdma_mask = ATA_MWDMA2,
+ .udma_mask = ATA_UDMA6,
+ .port_ops = &vt8251_ops,
+};
+
+MODULE_AUTHOR("Jeff Garzik");
+MODULE_DESCRIPTION("SCSI low-level driver for VIA SATA controllers");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, svia_pci_tbl);
+MODULE_VERSION(DRV_VERSION);
+
+static int svia_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val)
+{
+ if (sc_reg > SCR_CONTROL)
+ return -EINVAL;
+ *val = ioread32(link->ap->ioaddr.scr_addr + (4 * sc_reg));
+ return 0;
+}
+
+static int svia_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)
+{
+ if (sc_reg > SCR_CONTROL)
+ return -EINVAL;
+ iowrite32(val, link->ap->ioaddr.scr_addr + (4 * sc_reg));
+ return 0;
+}
+
+static int vt8251_scr_read(struct ata_link *link, unsigned int scr, u32 *val)
+{
+ static const u8 ipm_tbl[] = { 1, 2, 6, 0 };
+ struct pci_dev *pdev = to_pci_dev(link->ap->host->dev);
+ int slot = 2 * link->ap->port_no + link->pmp;
+ u32 v = 0;
+ u8 raw;
+
+ switch (scr) {
+ case SCR_STATUS:
+ pci_read_config_byte(pdev, 0xA0 + slot, &raw);
+
+ /* read the DET field, bit0 and 1 of the config byte */
+ v |= raw & 0x03;
+
+ /* read the SPD field, bit4 of the configure byte */
+ if (raw & (1 << 4))
+ v |= 0x02 << 4;
+ else
+ v |= 0x01 << 4;
+
+ /* read the IPM field, bit2 and 3 of the config byte */
+ v |= ipm_tbl[(raw >> 2) & 0x3];
+ break;
+
+ case SCR_ERROR:
+ /* devices other than 5287 uses 0xA8 as base */
+ WARN_ON(pdev->device != 0x5287);
+ pci_read_config_dword(pdev, 0xB0 + slot * 4, &v);
+ break;
+
+ case SCR_CONTROL:
+ pci_read_config_byte(pdev, 0xA4 + slot, &raw);
+
+ /* read the DET field, bit0 and bit1 */
+ v |= ((raw & 0x02) << 1) | (raw & 0x01);
+
+ /* read the IPM field, bit2 and bit3 */
+ v |= ((raw >> 2) & 0x03) << 8;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ *val = v;
+ return 0;
+}
+
+static int vt8251_scr_write(struct ata_link *link, unsigned int scr, u32 val)
+{
+ struct pci_dev *pdev = to_pci_dev(link->ap->host->dev);
+ int slot = 2 * link->ap->port_no + link->pmp;
+ u32 v = 0;
+
+ switch (scr) {
+ case SCR_ERROR:
+ /* devices other than 5287 uses 0xA8 as base */
+ WARN_ON(pdev->device != 0x5287);
+ pci_write_config_dword(pdev, 0xB0 + slot * 4, val);
+ return 0;
+
+ case SCR_CONTROL:
+ /* set the DET field */
+ v |= ((val & 0x4) >> 1) | (val & 0x1);
+
+ /* set the IPM field */
+ v |= ((val >> 8) & 0x3) << 2;
+
+ pci_write_config_byte(pdev, 0xA4 + slot, v);
+ return 0;
+
+ default:
+ return -EINVAL;
+ }
+}
+
+/**
+ * svia_tf_load - send taskfile registers to host controller
+ * @ap: Port to which output is sent
+ * @tf: ATA taskfile register set
+ *
+ * Outputs ATA taskfile to standard ATA host controller.
+ *
+ * This is to fix the internal bug of via chipsets, which will
+ * reset the device register after changing the IEN bit on ctl
+ * register.
+ */
+static void svia_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
+{
+ struct ata_taskfile ttf;
+
+ if (tf->ctl != ap->last_ctl) {
+ ttf = *tf;
+ ttf.flags |= ATA_TFLAG_DEVICE;
+ tf = &ttf;
+ }
+ ata_sff_tf_load(ap, tf);
+}
+
+static void svia_noop_freeze(struct ata_port *ap)
+{
+ /* Some VIA controllers choke if ATA_NIEN is manipulated in
+ * certain way. Leave it alone and just clear pending IRQ.
+ */
+ ap->ops->sff_check_status(ap);
+ ata_bmdma_irq_clear(ap);
+}
+
+/**
+ * vt6420_prereset - prereset for vt6420
+ * @link: target ATA link
+ * @deadline: deadline jiffies for the operation
+ *
+ * SCR registers on vt6420 are pieces of shit and may hang the
+ * whole machine completely if accessed with the wrong timing.
+ * To avoid such catastrophe, vt6420 doesn't provide generic SCR
+ * access operations, but uses SStatus and SControl only during
+ * boot probing in controlled way.
+ *
+ * As the old (pre EH update) probing code is proven to work, we
+ * strictly follow the access pattern.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep)
+ *
+ * RETURNS:
+ * 0 on success, -errno otherwise.
+ */
+static int vt6420_prereset(struct ata_link *link, unsigned long deadline)
+{
+ struct ata_port *ap = link->ap;
+ struct ata_eh_context *ehc = &ap->link.eh_context;
+ unsigned long timeout = jiffies + (HZ * 5);
+ u32 sstatus, scontrol;
+ int online;
+
+ /* don't do any SCR stuff if we're not loading */
+ if (!(ap->pflags & ATA_PFLAG_LOADING))
+ goto skip_scr;
+
+ /* Resume phy. This is the old SATA resume sequence */
+ svia_scr_write(link, SCR_CONTROL, 0x300);
+ svia_scr_read(link, SCR_CONTROL, &scontrol); /* flush */
+
+ /* wait for phy to become ready, if necessary */
+ do {
+ ata_msleep(link->ap, 200);
+ svia_scr_read(link, SCR_STATUS, &sstatus);
+ if ((sstatus & 0xf) != 1)
+ break;
+ } while (time_before(jiffies, timeout));
+
+ /* open code sata_print_link_status() */
+ svia_scr_read(link, SCR_STATUS, &sstatus);
+ svia_scr_read(link, SCR_CONTROL, &scontrol);
+
+ online = (sstatus & 0xf) == 0x3;
+
+ ata_port_info(ap,
+ "SATA link %s 1.5 Gbps (SStatus %X SControl %X)\n",
+ online ? "up" : "down", sstatus, scontrol);
+
+ /* SStatus is read one more time */
+ svia_scr_read(link, SCR_STATUS, &sstatus);
+
+ if (!online) {
+ /* tell EH to bail */
+ ehc->i.action &= ~ATA_EH_RESET;
+ return 0;
+ }
+
+ skip_scr:
+ /* wait for !BSY */
+ ata_sff_wait_ready(link, deadline);
+
+ return 0;
+}
+
+static void vt6420_bmdma_start(struct ata_queued_cmd *qc)
+{
+ struct ata_port *ap = qc->ap;
+ if ((qc->tf.command == ATA_CMD_PACKET) &&
+ (qc->scsicmd->sc_data_direction == DMA_TO_DEVICE)) {
+ /* Prevents corruption on some ATAPI burners */
+ ata_sff_pause(ap);
+ }
+ ata_bmdma_start(qc);
+}
+
+static int vt6421_pata_cable_detect(struct ata_port *ap)
+{
+ struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+ u8 tmp;
+
+ pci_read_config_byte(pdev, PATA_UDMA_TIMING, &tmp);
+ if (tmp & 0x10)
+ return ATA_CBL_PATA40;
+ return ATA_CBL_PATA80;
+}
+
+static void vt6421_set_pio_mode(struct ata_port *ap, struct ata_device *adev)
+{
+ struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+ static const u8 pio_bits[] = { 0xA8, 0x65, 0x65, 0x31, 0x20 };
+ pci_write_config_byte(pdev, PATA_PIO_TIMING - adev->devno,
+ pio_bits[adev->pio_mode - XFER_PIO_0]);
+}
+
+static void vt6421_set_dma_mode(struct ata_port *ap, struct ata_device *adev)
+{
+ struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+ static const u8 udma_bits[] = { 0xEE, 0xE8, 0xE6, 0xE4, 0xE2, 0xE1, 0xE0, 0xE0 };
+ pci_write_config_byte(pdev, PATA_UDMA_TIMING - adev->devno,
+ udma_bits[adev->dma_mode - XFER_UDMA_0]);
+}
+
+static const unsigned int svia_bar_sizes[] = {
+ 8, 4, 8, 4, 16, 256
+};
+
+static const unsigned int vt6421_bar_sizes[] = {
+ 16, 16, 16, 16, 32, 128
+};
+
+static void __iomem *svia_scr_addr(void __iomem *addr, unsigned int port)
+{
+ return addr + (port * 128);
+}
+
+static void __iomem *vt6421_scr_addr(void __iomem *addr, unsigned int port)
+{
+ return addr + (port * 64);
+}
+
+static void vt6421_init_addrs(struct ata_port *ap)
+{
+ void __iomem * const * iomap = ap->host->iomap;
+ void __iomem *reg_addr = iomap[ap->port_no];
+ void __iomem *bmdma_addr = iomap[4] + (ap->port_no * 8);
+ struct ata_ioports *ioaddr = &ap->ioaddr;
+
+ ioaddr->cmd_addr = reg_addr;
+ ioaddr->altstatus_addr =
+ ioaddr->ctl_addr = (void __iomem *)
+ ((unsigned long)(reg_addr + 8) | ATA_PCI_CTL_OFS);
+ ioaddr->bmdma_addr = bmdma_addr;
+ ioaddr->scr_addr = vt6421_scr_addr(iomap[5], ap->port_no);
+
+ ata_sff_std_ports(ioaddr);
+
+ ata_port_pbar_desc(ap, ap->port_no, -1, "port");
+ ata_port_pbar_desc(ap, 4, ap->port_no * 8, "bmdma");
+}
+
+static int vt6420_prepare_host(struct pci_dev *pdev, struct ata_host **r_host)
+{
+ const struct ata_port_info *ppi[] = { &vt6420_port_info, NULL };
+ struct ata_host *host;
+ int rc;
+
+ if (vt6420_hotplug) {
+ ppi[0]->port_ops->scr_read = svia_scr_read;
+ ppi[0]->port_ops->scr_write = svia_scr_write;
+ }
+
+ rc = ata_pci_bmdma_prepare_host(pdev, ppi, &host);
+ if (rc)
+ return rc;
+ *r_host = host;
+
+ rc = pcim_iomap_regions(pdev, 1 << 5, DRV_NAME);
+ if (rc) {
+ dev_err(&pdev->dev, "failed to iomap PCI BAR 5\n");
+ return rc;
+ }
+
+ host->ports[0]->ioaddr.scr_addr = svia_scr_addr(host->iomap[5], 0);
+ host->ports[1]->ioaddr.scr_addr = svia_scr_addr(host->iomap[5], 1);
+
+ return 0;
+}
+
+static int vt6421_prepare_host(struct pci_dev *pdev, struct ata_host **r_host)
+{
+ const struct ata_port_info *ppi[] =
+ { &vt6421_sport_info, &vt6421_sport_info, &vt6421_pport_info };
+ struct ata_host *host;
+ int i, rc;
+
+ *r_host = host = ata_host_alloc_pinfo(&pdev->dev, ppi, ARRAY_SIZE(ppi));
+ if (!host) {
+ dev_err(&pdev->dev, "failed to allocate host\n");
+ return -ENOMEM;
+ }
+
+ rc = pcim_iomap_regions(pdev, 0x3f, DRV_NAME);
+ if (rc) {
+ dev_err(&pdev->dev, "failed to request/iomap PCI BARs (errno=%d)\n",
+ rc);
+ return rc;
+ }
+ host->iomap = pcim_iomap_table(pdev);
+
+ for (i = 0; i < host->n_ports; i++)
+ vt6421_init_addrs(host->ports[i]);
+
+ return dma_set_mask_and_coherent(&pdev->dev, ATA_DMA_MASK);
+}
+
+static int vt8251_prepare_host(struct pci_dev *pdev, struct ata_host **r_host)
+{
+ const struct ata_port_info *ppi[] = { &vt8251_port_info, NULL };
+ struct ata_host *host;
+ int i, rc;
+
+ rc = ata_pci_bmdma_prepare_host(pdev, ppi, &host);
+ if (rc)
+ return rc;
+ *r_host = host;
+
+ rc = pcim_iomap_regions(pdev, 1 << 5, DRV_NAME);
+ if (rc) {
+ dev_err(&pdev->dev, "failed to iomap PCI BAR 5\n");
+ return rc;
+ }
+
+ /* 8251 hosts four sata ports as M/S of the two channels */
+ for (i = 0; i < host->n_ports; i++)
+ ata_slave_link_init(host->ports[i]);
+
+ return 0;
+}
+
+static void svia_wd_fix(struct pci_dev *pdev)
+{
+ u8 tmp8;
+
+ pci_read_config_byte(pdev, 0x52, &tmp8);
+ pci_write_config_byte(pdev, 0x52, tmp8 | BIT(2));
+}
+
+static irqreturn_t vt642x_interrupt(int irq, void *dev_instance)
+{
+ struct ata_host *host = dev_instance;
+ irqreturn_t rc = ata_bmdma_interrupt(irq, dev_instance);
+
+ /* if the IRQ was not handled, it might be a hotplug IRQ */
+ if (rc != IRQ_HANDLED) {
+ u32 serror;
+ unsigned long flags;
+
+ spin_lock_irqsave(&host->lock, flags);
+ /* check for hotplug on port 0 */
+ svia_scr_read(&host->ports[0]->link, SCR_ERROR, &serror);
+ if (serror & SERR_PHYRDY_CHG) {
+ ata_ehi_hotplugged(&host->ports[0]->link.eh_info);
+ ata_port_freeze(host->ports[0]);
+ rc = IRQ_HANDLED;
+ }
+ /* check for hotplug on port 1 */
+ svia_scr_read(&host->ports[1]->link, SCR_ERROR, &serror);
+ if (serror & SERR_PHYRDY_CHG) {
+ ata_ehi_hotplugged(&host->ports[1]->link.eh_info);
+ ata_port_freeze(host->ports[1]);
+ rc = IRQ_HANDLED;
+ }
+ spin_unlock_irqrestore(&host->lock, flags);
+ }
+
+ return rc;
+}
+
+static void vt6421_error_handler(struct ata_port *ap)
+{
+ struct svia_priv *hpriv = ap->host->private_data;
+ struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+ u32 serror;
+
+ /* see svia_configure() for description */
+ if (!hpriv->wd_workaround) {
+ svia_scr_read(&ap->link, SCR_ERROR, &serror);
+ if (serror == 0x1000500) {
+ ata_port_warn(ap, "Incompatible drive: enabling workaround. This slows down transfer rate to ~60 MB/s");
+ svia_wd_fix(pdev);
+ hpriv->wd_workaround = true;
+ ap->link.eh_context.i.flags |= ATA_EHI_QUIET;
+ }
+ }
+
+ ata_sff_error_handler(ap);
+}
+
+static void svia_configure(struct pci_dev *pdev, int board_id,
+ struct svia_priv *hpriv)
+{
+ u8 tmp8;
+
+ pci_read_config_byte(pdev, PCI_INTERRUPT_LINE, &tmp8);
+ dev_info(&pdev->dev, "routed to hard irq line %d\n",
+ (int) (tmp8 & 0xf0) == 0xf0 ? 0 : tmp8 & 0x0f);
+
+ /* make sure SATA channels are enabled */
+ pci_read_config_byte(pdev, SATA_CHAN_ENAB, &tmp8);
+ if ((tmp8 & ALL_PORTS) != ALL_PORTS) {
+ dev_dbg(&pdev->dev, "enabling SATA channels (0x%x)\n",
+ (int)tmp8);
+ tmp8 |= ALL_PORTS;
+ pci_write_config_byte(pdev, SATA_CHAN_ENAB, tmp8);
+ }
+
+ /* make sure interrupts for each channel sent to us */
+ pci_read_config_byte(pdev, SATA_INT_GATE, &tmp8);
+ if ((tmp8 & ALL_PORTS) != ALL_PORTS) {
+ dev_dbg(&pdev->dev, "enabling SATA channel interrupts (0x%x)\n",
+ (int) tmp8);
+ tmp8 |= ALL_PORTS;
+ pci_write_config_byte(pdev, SATA_INT_GATE, tmp8);
+ }
+
+ /* make sure native mode is enabled */
+ pci_read_config_byte(pdev, SATA_NATIVE_MODE, &tmp8);
+ if ((tmp8 & NATIVE_MODE_ALL) != NATIVE_MODE_ALL) {
+ dev_dbg(&pdev->dev,
+ "enabling SATA channel native mode (0x%x)\n",
+ (int) tmp8);
+ tmp8 |= NATIVE_MODE_ALL;
+ pci_write_config_byte(pdev, SATA_NATIVE_MODE, tmp8);
+ }
+
+ if ((board_id == vt6420 && vt6420_hotplug) || board_id == vt6421) {
+ /* enable IRQ on hotplug */
+ pci_read_config_byte(pdev, SVIA_MISC_3, &tmp8);
+ if ((tmp8 & SATA_HOTPLUG) != SATA_HOTPLUG) {
+ dev_dbg(&pdev->dev,
+ "enabling SATA hotplug (0x%x)\n",
+ (int) tmp8);
+ tmp8 |= SATA_HOTPLUG;
+ pci_write_config_byte(pdev, SVIA_MISC_3, tmp8);
+ }
+ }
+
+ /*
+ * vt6420/1 has problems talking to some drives. The following
+ * is the fix from Joseph Chan <JosephChan@via.com.tw>.
+ *
+ * When host issues HOLD, device may send up to 20DW of data
+ * before acknowledging it with HOLDA and the host should be
+ * able to buffer them in FIFO. Unfortunately, some WD drives
+ * send up to 40DW before acknowledging HOLD and, in the
+ * default configuration, this ends up overflowing vt6421's
+ * FIFO, making the controller abort the transaction with
+ * R_ERR.
+ *
+ * Rx52[2] is the internal 128DW FIFO Flow control watermark
+ * adjusting mechanism enable bit and the default value 0
+ * means host will issue HOLD to device when the left FIFO
+ * size goes below 32DW. Setting it to 1 makes the watermark
+ * 64DW.
+ *
+ * https://bugzilla.kernel.org/show_bug.cgi?id=15173
+ * http://article.gmane.org/gmane.linux.ide/46352
+ * http://thread.gmane.org/gmane.linux.kernel/1062139
+ *
+ * As the fix slows down data transfer, apply it only if the error
+ * actually appears - see vt6421_error_handler()
+ * Apply the fix always on vt6420 as we don't know if SCR_ERROR can be
+ * read safely.
+ */
+ if (board_id == vt6420) {
+ svia_wd_fix(pdev);
+ hpriv->wd_workaround = true;
+ }
+}
+
+static int svia_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+ unsigned int i;
+ int rc;
+ struct ata_host *host = NULL;
+ int board_id = (int) ent->driver_data;
+ const unsigned *bar_sizes;
+ struct svia_priv *hpriv;
+
+ ata_print_version_once(&pdev->dev, DRV_VERSION);
+
+ rc = pcim_enable_device(pdev);
+ if (rc)
+ return rc;
+
+ if (board_id == vt6421)
+ bar_sizes = &vt6421_bar_sizes[0];
+ else
+ bar_sizes = &svia_bar_sizes[0];
+
+ for (i = 0; i < ARRAY_SIZE(svia_bar_sizes); i++)
+ if ((pci_resource_start(pdev, i) == 0) ||
+ (pci_resource_len(pdev, i) < bar_sizes[i])) {
+ dev_err(&pdev->dev,
+ "invalid PCI BAR %u (sz 0x%llx, val 0x%llx)\n",
+ i,
+ (unsigned long long)pci_resource_start(pdev, i),
+ (unsigned long long)pci_resource_len(pdev, i));
+ return -ENODEV;
+ }
+
+ switch (board_id) {
+ case vt6420:
+ rc = vt6420_prepare_host(pdev, &host);
+ break;
+ case vt6421:
+ rc = vt6421_prepare_host(pdev, &host);
+ break;
+ case vt8251:
+ rc = vt8251_prepare_host(pdev, &host);
+ break;
+ default:
+ rc = -EINVAL;
+ }
+ if (rc)
+ return rc;
+
+ hpriv = devm_kzalloc(&pdev->dev, sizeof(*hpriv), GFP_KERNEL);
+ if (!hpriv)
+ return -ENOMEM;
+ host->private_data = hpriv;
+
+ svia_configure(pdev, board_id, hpriv);
+
+ pci_set_master(pdev);
+ if ((board_id == vt6420 && vt6420_hotplug) || board_id == vt6421)
+ return ata_host_activate(host, pdev->irq, vt642x_interrupt,
+ IRQF_SHARED, &svia_sht);
+ else
+ return ata_host_activate(host, pdev->irq, ata_bmdma_interrupt,
+ IRQF_SHARED, &svia_sht);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int svia_pci_device_resume(struct pci_dev *pdev)
+{
+ struct ata_host *host = pci_get_drvdata(pdev);
+ struct svia_priv *hpriv = host->private_data;
+ int rc;
+
+ rc = ata_pci_device_do_resume(pdev);
+ if (rc)
+ return rc;
+
+ if (hpriv->wd_workaround)
+ svia_wd_fix(pdev);
+ ata_host_resume(host);
+
+ return 0;
+}
+#endif
+
+module_pci_driver(svia_pci_driver);