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pata_atp867x: PIO support fixes
* use 8 clk setting for active clocks == 7 (was 12 clk) * use 12 clk setting for active clocks > 12 (was 8 clk) * do 66MHz bus fixup before mapping active clocks * fix setup of PIO command timings Acked-by: Jung-Ik (John) Lee <jilee@google.com> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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64207f5913
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1 changed files with 25 additions and 23 deletions
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@ -155,30 +155,31 @@ static int atp867x_get_active_clocks_shifted(struct ata_port *ap,
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struct atp867x_priv *dp = ap->private_data;
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struct atp867x_priv *dp = ap->private_data;
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unsigned char clocks = clk;
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unsigned char clocks = clk;
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switch (clocks) {
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case 0:
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clocks = 1;
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break;
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case 1 ... 7:
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break;
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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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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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/*
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* Doc 6.6.9: increase the clock value by 1 for safer PIO speed
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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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* on 66MHz bus
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*/
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*/
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if (dp->pci66mhz && clocks < 7)
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if (dp->pci66mhz)
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clocks++;
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clocks++;
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switch (clocks) {
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case 0:
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clocks = 1;
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break;
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case 1 ... 6:
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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 12clk.\n", clk);
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case 9 ... 12:
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clocks = 7; /* 12 clk */
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break;
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case 7:
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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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active_clock_shift_done:
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active_clock_shift_done:
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return clocks << ATP867X_IO_PIOSPD_ACTIVE_SHIFT;
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return clocks << ATP867X_IO_PIOSPD_ACTIVE_SHIFT;
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}
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}
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@ -193,7 +194,8 @@ static int atp867x_get_recover_clocks_shifted(unsigned int clk)
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break;
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break;
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case 1 ... 11:
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case 1 ... 11:
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break;
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break;
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case 13: case 14:
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case 13:
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case 14:
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--clocks; /* by the spec */
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--clocks; /* by the spec */
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break;
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break;
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case 15:
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case 15:
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@ -242,9 +244,9 @@ static void atp867x_set_piomode(struct ata_port *ap, struct ata_device *adev)
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else
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else
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iowrite8(b, dp->mstr_piospd);
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iowrite8(b, dp->mstr_piospd);
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/*
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b = atp867x_get_active_clocks_shifted(ap, t.act8b) |
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* use the same value for comand timing as for PIO timimg
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atp867x_get_recover_clocks_shifted(t.rec8b);
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*/
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iowrite8(b, dp->eightb_piospd);
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iowrite8(b, dp->eightb_piospd);
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}
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}
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