Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=640fdb504941fa2b9f6f274716fc9f97f2bf6bff
Commit:     640fdb504941fa2b9f6f274716fc9f97f2bf6bff
Parent:     782e3b3b3804c38d5130c7f21d7ec7bf6709023f
Author:     Jeff Garzik <[EMAIL PROTECTED]>
AuthorDate: Fri Aug 3 11:10:07 2007 -0400
Committer:  Jeff Garzik <[EMAIL PROTECTED]>
CommitDate: Fri Oct 12 14:55:30 2007 -0400

    [libata] pdc_adma: convert to new exception handling (EH) framework
    
    Signed-off-by: Jeff Garzik <[EMAIL PROTECTED]>
---
 drivers/ata/pdc_adma.c |   82 +++++++++++++++++++++++++++++++++++++++---------
 1 files changed, 67 insertions(+), 15 deletions(-)

diff --git a/drivers/ata/pdc_adma.c b/drivers/ata/pdc_adma.c
index 5c79271..c95c1bf 100644
--- a/drivers/ata/pdc_adma.c
+++ b/drivers/ata/pdc_adma.c
@@ -92,6 +92,8 @@ enum {
 
        /* CPB bits */
        cDONE                   = (1 << 0),
+       cATERR                  = (1 << 3),
+
        cVLD                    = (1 << 0),
        cDAT                    = (1 << 2),
        cIEN                    = (1 << 3),
@@ -131,14 +133,15 @@ static int adma_ata_init_one (struct pci_dev *pdev,
 static int adma_port_start(struct ata_port *ap);
 static void adma_host_stop(struct ata_host *host);
 static void adma_port_stop(struct ata_port *ap);
-static void adma_phy_reset(struct ata_port *ap);
 static void adma_qc_prep(struct ata_queued_cmd *qc);
 static unsigned int adma_qc_issue(struct ata_queued_cmd *qc);
 static int adma_check_atapi_dma(struct ata_queued_cmd *qc);
 static void adma_bmdma_stop(struct ata_queued_cmd *qc);
 static u8 adma_bmdma_status(struct ata_port *ap);
 static void adma_irq_clear(struct ata_port *ap);
-static void adma_eng_timeout(struct ata_port *ap);
+static void adma_freeze(struct ata_port *ap);
+static void adma_thaw(struct ata_port *ap);
+static void adma_error_handler(struct ata_port *ap);
 
 static struct scsi_host_template adma_ata_sht = {
        .module                 = THIS_MODULE,
@@ -165,12 +168,13 @@ static const struct ata_port_operations adma_ata_ops = {
        .exec_command           = ata_exec_command,
        .check_status           = ata_check_status,
        .dev_select             = ata_std_dev_select,
-       .phy_reset              = adma_phy_reset,
        .check_atapi_dma        = adma_check_atapi_dma,
        .data_xfer              = ata_data_xfer,
        .qc_prep                = adma_qc_prep,
        .qc_issue               = adma_qc_issue,
-       .eng_timeout            = adma_eng_timeout,
+       .freeze                 = adma_freeze,
+       .thaw                   = adma_thaw,
+       .error_handler          = adma_error_handler,
        .irq_clear              = adma_irq_clear,
        .irq_on                 = ata_irq_on,
        .irq_ack                = ata_irq_ack,
@@ -184,7 +188,7 @@ static const struct ata_port_operations adma_ata_ops = {
 static struct ata_port_info adma_port_info[] = {
        /* board_1841_idx */
        {
-               .flags          = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST |
+               .flags          = ATA_FLAG_SLAVE_POSS |
                                  ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO |
                                  ATA_FLAG_PIO_POLLING,
                .pio_mask       = 0x10, /* pio4 */
@@ -273,24 +277,41 @@ static inline void adma_enter_reg_mode(struct ata_port 
*ap)
        readb(chan + ADMA_STATUS);      /* flush */
 }
 
-static void adma_phy_reset(struct ata_port *ap)
+static void adma_freeze(struct ata_port *ap)
 {
-       struct adma_port_priv *pp = ap->private_data;
+       void __iomem *chan = ADMA_PORT_REGS(ap);
+
+       /* mask/clear ATA interrupts */
+       writeb(ATA_NIEN, ap->ioaddr.ctl_addr);
+       ata_check_status(ap);
+
+       /* reset ADMA to idle state */
+       writew(aPIOMD4 | aNIEN | aRSTADM, chan + ADMA_CONTROL);
+       udelay(2);
+       writew(aPIOMD4 | aNIEN, chan + ADMA_CONTROL);
+       udelay(2);
+}
 
-       pp->state = adma_state_idle;
+static void adma_thaw(struct ata_port *ap)
+{
        adma_reinit_engine(ap);
-       ata_port_probe(ap);
-       ata_bus_reset(ap);
 }
 
-static void adma_eng_timeout(struct ata_port *ap)
+static int adma_prereset(struct ata_port *ap, unsigned long deadline)
 {
        struct adma_port_priv *pp = ap->private_data;
 
        if (pp->state != adma_state_idle) /* healthy paranoia */
                pp->state = adma_state_mmio;
        adma_reinit_engine(ap);
-       ata_eng_timeout(ap);
+
+       return ata_std_prereset(ap, deadline);
+}
+
+static void adma_error_handler(struct ata_port *ap)
+{
+       ata_do_eh(ap, adma_prereset, ata_std_softreset, NULL,
+                 ata_std_postreset);
 }
 
 static int adma_fill_sg(struct ata_queued_cmd *qc)
@@ -466,12 +487,31 @@ static inline unsigned int adma_intr_pkt(struct ata_host 
*host)
                        continue;
                qc = ata_qc_from_tag(ap, ap->active_tag);
                if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
-                       if ((status & (aPERR | aPSD | aUIRQ)))
+                       if (status & aPERR)
+                               qc->err_mask |= AC_ERR_HOST_BUS;
+                       else if ((status & (aPSD | aUIRQ)))
                                qc->err_mask |= AC_ERR_OTHER;
+
+                       if (pp->pkt[0] & cATERR)
+                               qc->err_mask |= AC_ERR_DEV;
                        else if (pp->pkt[0] != cDONE)
                                qc->err_mask |= AC_ERR_OTHER;
 
-                       ata_qc_complete(qc);
+                       if (!qc->err_mask)
+                               ata_qc_complete(qc);
+                       else {
+                               struct ata_eh_info *ehi = &ap->eh_info;
+                               ata_ehi_clear_desc(ehi);
+                               ata_ehi_push_desc(ehi,
+                                       "ADMA-status 0x%02X", status);
+                               ata_ehi_push_desc(ehi,
+                                       "pkt[0] 0x%02X", pp->pkt[0]);
+
+                               if (qc->err_mask == AC_ERR_DEV)
+                                       ata_port_abort(ap);
+                               else
+                                       ata_port_freeze(ap);
+                       }
                }
        }
        return handled;
@@ -502,7 +542,19 @@ static inline unsigned int adma_intr_mmio(struct ata_host 
*host)
                                /* complete taskfile transaction */
                                pp->state = adma_state_idle;
                                qc->err_mask |= ac_err_mask(status);
-                               ata_qc_complete(qc);
+                               if (!qc->err_mask)
+                                       ata_qc_complete(qc);
+                               else {
+                                       struct ata_eh_info *ehi = &ap->eh_info;
+                                       ata_ehi_clear_desc(ehi);
+                                       ata_ehi_push_desc(ehi,
+                                               "status 0x%02X", status);
+
+                                       if (qc->err_mask == AC_ERR_DEV)
+                                               ata_port_abort(ap);
+                                       else
+                                               ata_port_freeze(ap);
+                               }
                                handled = 1;
                        }
                }
-
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