Skip to content

Commit

Permalink
[libata] sata_sx4: convert to new exception handling methods
Browse files Browse the repository at this point in the history 
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
  • Loading branch information
Jeff Garzik authored and Jeff Garzik committed May 15, 2009
1 parent 5d41343 commit 67651ee
Showing 1 changed file with 121 additions and 45 deletions.
166 changes: 121 additions & 45 deletions drivers/ata/sata_sx4.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -213,8 +213,9 @@ struct pdc_host_priv {


static int pdc_sata_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
static void pdc_eng_timeout(struct ata_port *ap);
static void pdc_20621_phy_reset(struct ata_port *ap);
static void pdc_error_handler(struct ata_port *ap);
static void pdc_freeze(struct ata_port *ap);
static void pdc_thaw(struct ata_port *ap);
static int pdc_port_start(struct ata_port *ap);
static void pdc20621_qc_prep(struct ata_queued_cmd *qc);
static void pdc_tf_load_mmio(struct ata_port *ap, const struct ata_taskfile *tf);
Expand All @@ -233,6 +234,10 @@ static void pdc20621_put_to_dimm(struct ata_host *host,
void *psource, u32 offset, u32 size);
static void pdc20621_irq_clear(struct ata_port *ap);
static unsigned int pdc20621_qc_issue(struct ata_queued_cmd *qc);
static int pdc_softreset(struct ata_link *link, unsigned int *class,
unsigned long deadline);
static void pdc_post_internal_cmd(struct ata_queued_cmd *qc);
static int pdc_check_atapi_dma(struct ata_queued_cmd *qc);


static struct scsi_host_template pdc_sata_sht = {
Expand All @@ -243,20 +248,24 @@ static struct scsi_host_template pdc_sata_sht = {

/* TODO: inherit from base port_ops after converting to new EH */
static struct ata_port_operations pdc_20621_ops = {
.sff_tf_load = pdc_tf_load_mmio,
.sff_tf_read = ata_sff_tf_read,
.sff_check_status = ata_sff_check_status,
.sff_exec_command = pdc_exec_command_mmio,
.sff_dev_select = ata_sff_dev_select,
.phy_reset = pdc_20621_phy_reset,
.inherits = &ata_sff_port_ops,

.check_atapi_dma = pdc_check_atapi_dma,
.qc_prep = pdc20621_qc_prep,
.qc_issue = pdc20621_qc_issue,
.qc_fill_rtf = ata_sff_qc_fill_rtf,
.sff_data_xfer = ata_sff_data_xfer,
.eng_timeout = pdc_eng_timeout,
.sff_irq_clear = pdc20621_irq_clear,
.sff_irq_on = ata_sff_irq_on,

.freeze = pdc_freeze,
.thaw = pdc_thaw,
.softreset = pdc_softreset,
.error_handler = pdc_error_handler,
.lost_interrupt = ATA_OP_NULL,
.post_internal_cmd = pdc_post_internal_cmd,

.port_start = pdc_port_start,

.sff_tf_load = pdc_tf_load_mmio,
.sff_exec_command = pdc_exec_command_mmio,
.sff_irq_clear = pdc20621_irq_clear,
};

static const struct ata_port_info pdc_port_info[] = {
Expand Down Expand Up @@ -310,14 +319,6 @@ static int pdc_port_start(struct ata_port *ap)
return 0;
}

static void pdc_20621_phy_reset(struct ata_port *ap)
{
VPRINTK("ENTER\n");
ap->cbl = ATA_CBL_SATA;
ata_port_probe(ap);
ata_bus_reset(ap);
}

static inline void pdc20621_ata_sg(struct ata_taskfile *tf, u8 *buf,
unsigned int portno,
unsigned int total_len)
Expand Down Expand Up @@ -859,40 +860,115 @@ static irqreturn_t pdc20621_interrupt(int irq, void *dev_instance)
return IRQ_RETVAL(handled);
}

static void pdc_eng_timeout(struct ata_port *ap)
static void pdc_freeze(struct ata_port *ap)
{
u8 drv_stat;
struct ata_host *host = ap->host;
struct ata_queued_cmd *qc;
unsigned long flags;
void __iomem *mmio = ap->ioaddr.cmd_addr;
u32 tmp;

DPRINTK("ENTER\n");
/* FIXME: if all 4 ATA engines are stopped, also stop HDMA engine */

spin_lock_irqsave(&host->lock, flags);
tmp = readl(mmio + PDC_CTLSTAT);
tmp |= PDC_MASK_INT;
tmp &= ~PDC_DMA_ENABLE;
writel(tmp, mmio + PDC_CTLSTAT);
readl(mmio + PDC_CTLSTAT); /* flush */
}

qc = ata_qc_from_tag(ap, ap->link.active_tag);
static void pdc_thaw(struct ata_port *ap)
{
void __iomem *mmio = ap->ioaddr.cmd_addr;
void __iomem *mmio_base;
u32 tmp;

switch (qc->tf.protocol) {
case ATA_PROT_DMA:
case ATA_PROT_NODATA:
ata_port_printk(ap, KERN_ERR, "command timeout\n");
qc->err_mask |= __ac_err_mask(ata_wait_idle(ap));
break;
/* FIXME: start HDMA engine, if zero ATA engines running */

default:
drv_stat = ata_sff_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);
/* reading SEQ mask register clears IRQ */
mmio_base = ap->host->iomap[PDC_MMIO_BAR] + PDC_CHIP0_OFS;
readl(mmio_base + PDC_20621_SEQMASK);

ata_port_printk(ap, KERN_ERR,
"unknown timeout, cmd 0x%x stat 0x%x\n",
qc->tf.command, drv_stat);
/* turn IRQ back on */
tmp = readl(mmio + PDC_CTLSTAT);
tmp &= ~PDC_MASK_INT;
writel(tmp, mmio + PDC_CTLSTAT);
readl(mmio + PDC_CTLSTAT); /* flush */
}

qc->err_mask |= ac_err_mask(drv_stat);
break;
static void pdc_reset_port(struct ata_port *ap)
{
void __iomem *mmio = ap->ioaddr.cmd_addr + PDC_CTLSTAT;
unsigned int i;
u32 tmp;

/* FIXME: handle HDMA copy engine */

for (i = 11; i > 0; i--) {
tmp = readl(mmio);
if (tmp & PDC_RESET)
break;

udelay(100);

tmp |= PDC_RESET;
writel(tmp, mmio);
}

spin_unlock_irqrestore(&host->lock, flags);
ata_eh_qc_complete(qc);
DPRINTK("EXIT\n");
tmp &= ~PDC_RESET;
writel(tmp, mmio);
readl(mmio); /* flush */
}

static int pdc_softreset(struct ata_link *link, unsigned int *class,
unsigned long deadline)
{
pdc_reset_port(link->ap);
return ata_sff_softreset(link, class, deadline);
}

static void pdc_error_handler(struct ata_port *ap)
{
if (!(ap->pflags & ATA_PFLAG_FROZEN))
pdc_reset_port(ap);

ata_std_error_handler(ap);
}

static void pdc_post_internal_cmd(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;

/* make DMA engine forget about the failed command */
if (qc->flags & ATA_QCFLAG_FAILED)
pdc_reset_port(ap);
}

static int pdc_check_atapi_dma(struct ata_queued_cmd *qc)
{
u8 *scsicmd = qc->scsicmd->cmnd;
int pio = 1; /* atapi dma off by default */

/* Whitelist commands that may use DMA. */
switch (scsicmd[0]) {
case WRITE_12:
case WRITE_10:
case WRITE_6:
case READ_12:
case READ_10:
case READ_6:
case 0xad: /* READ_DVD_STRUCTURE */
case 0xbe: /* READ_CD */
pio = 0;
}
/* -45150 (FFFF4FA2) to -1 (FFFFFFFF) shall use PIO mode */
if (scsicmd[0] == WRITE_10) {
unsigned int lba =
(scsicmd[2] << 24) |
(scsicmd[3] << 16) |
(scsicmd[4] << 8) |
scsicmd[5];
if (lba >= 0xFFFF4FA2)
pio = 1;
}
return pio;
}

static void pdc_tf_load_mmio(struct ata_port *ap, const struct ata_taskfile *tf)
Expand Down

0 comments on commit 67651ee

Please sign in to comment.