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pata_atp867x: clarifications in timings calculations and cable detection
Signed-off-by: John(Jung-Ik) Lee <jilee@google.com> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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@ -149,8 +149,10 @@ static void atp867x_set_dmamode(struct ata_port *ap, struct ata_device *adev)
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iowrite8(b, dp->dma_mode);
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}
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static int atp867x_get_active_clocks_shifted(unsigned int clk)
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static int atp867x_get_active_clocks_shifted(struct ata_port *ap,
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unsigned int clk)
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{
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struct atp867x_priv *dp = ap->private_data;
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unsigned char clocks = clk;
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switch (clocks) {
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@ -159,15 +161,25 @@ static int atp867x_get_active_clocks_shifted(unsigned int clk)
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break;
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case 1 ... 7:
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break;
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case 8 ... 12:
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case 9 ... 12:
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clocks = 7;
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break;
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default:
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printk(KERN_WARNING "ATP867X: active %dclk is invalid. "
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"Using default 8clk.\n", clk);
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clocks = 0; /* 8 clk */
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break;
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case 8: /* default 8 clk */
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clocks = 0;
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goto active_clock_shift_done;
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}
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/*
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* Doc 6.6.9: increase the clock value by 1 for safer PIO speed
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* on 66MHz bus
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*/
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if (dp->pci66mhz && clocks < 7)
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clocks++;
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active_clock_shift_done:
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return clocks << ATP867X_IO_PIOSPD_ACTIVE_SHIFT;
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}
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@ -181,20 +193,19 @@ static int atp867x_get_recover_clocks_shifted(unsigned int clk)
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break;
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case 1 ... 11:
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break;
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case 12:
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clocks = 0;
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break;
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case 13: case 14:
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--clocks;
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--clocks; /* by the spec */
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break;
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case 15:
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break;
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default:
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printk(KERN_WARNING "ATP867X: recover %dclk is invalid. "
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"Using default 15clk.\n", clk);
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clocks = 0; /* 12 clk */
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"Using default 12clk.\n", clk);
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case 12: /* default 12 clk */
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clocks = 0;
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break;
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}
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return clocks << ATP867X_IO_PIOSPD_RECOVER_SHIFT;
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}
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@ -223,10 +234,8 @@ static void atp867x_set_piomode(struct ata_port *ap, struct ata_device *adev)
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b = (b & ~ATP867X_IO_DMAMODE_MSTR_MASK);
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iowrite8(b, dp->dma_mode);
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b = atp867x_get_active_clocks_shifted(t.active) |
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b = atp867x_get_active_clocks_shifted(ap, t.active) |
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atp867x_get_recover_clocks_shifted(t.recover);
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if (dp->pci66mhz)
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b += 0x10;
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if (adev->devno & 1)
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iowrite8(b, dp->slave_piospd);
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@ -239,9 +248,24 @@ static void atp867x_set_piomode(struct ata_port *ap, struct ata_device *adev)
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iowrite8(b, dp->eightb_piospd);
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}
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static int atp867x_cable_override(struct pci_dev *pdev)
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{
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if (pdev->subsystem_vendor == PCI_VENDOR_ID_ARTOP &&
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(pdev->subsystem_device == PCI_DEVICE_ID_ARTOP_ATP867A ||
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pdev->subsystem_device == PCI_DEVICE_ID_ARTOP_ATP867B)) {
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return 1;
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}
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return 0;
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}
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static int atp867x_cable_detect(struct ata_port *ap)
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{
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return ATA_CBL_PATA40_SHORT;
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struct pci_dev *pdev = to_pci_dev(ap->host->dev);
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if (atp867x_cable_override(pdev))
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return ATA_CBL_PATA40_SHORT;
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return ATA_CBL_PATA_UNK;
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}
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static struct scsi_host_template atp867x_sht = {
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