diff options
Diffstat (limited to 'drivers/ide/tx4938ide.c')
| -rw-r--r-- | drivers/ide/tx4938ide.c | 41 |
1 files changed, 27 insertions, 14 deletions
diff --git a/drivers/ide/tx4938ide.c b/drivers/ide/tx4938ide.c index fa660f931a1..9120063e8f8 100644 --- a/drivers/ide/tx4938ide.c +++ b/drivers/ide/tx4938ide.c @@ -26,12 +26,13 @@ static void tx4938ide_tune_ebusc(unsigned int ebus_ch, unsigned int sp = (cr >> 4) & 3; unsigned int clock = gbus_clock / (4 - sp); unsigned int cycle = 1000000000 / clock; - unsigned int wt, shwt; + unsigned int shwt; + int wt; /* Minimum DIOx- active time */ wt = DIV_ROUND_UP(t->act8b, cycle) - 2; /* IORDY setup time: 35ns */ - wt = max(wt, DIV_ROUND_UP(35, cycle)); + wt = max_t(int, wt, DIV_ROUND_UP(35, cycle)); /* actual wait-cycle is max(wt & ~1, 1) */ if (wt > 2 && (wt & 1)) wt++; @@ -39,10 +40,17 @@ static void tx4938ide_tune_ebusc(unsigned int ebus_ch, /* Address-valid to DIOR/DIOW setup */ shwt = DIV_ROUND_UP(t->setup, cycle); + /* -DIOx recovery time (SHWT * 4) and cycle time requirement */ + while ((shwt * 4 + wt + (wt ? 2 : 3)) * cycle < t->cycle) + shwt++; + if (shwt > 7) { + pr_warning("tx4938ide: SHWT violation (%d)\n", shwt); + shwt = 7; + } pr_debug("tx4938ide: ebus %d, bus cycle %dns, WT %d, SHWT %d\n", ebus_ch, cycle, wt, shwt); - __raw_writeq((cr & ~(0x3f007ull)) | (wt << 12) | shwt, + __raw_writeq((cr & ~0x3f007ull) | (wt << 12) | shwt, &tx4938_ebuscptr->cr[ebus_ch]); } @@ -228,7 +236,7 @@ static int __init tx4938ide_probe(struct platform_device *pdev) struct resource *res; struct tx4938ide_platform_info *pdata = pdev->dev.platform_data; int irq, ret, i; - unsigned long mapbase; + unsigned long mapbase, mapctl; struct ide_port_info d = tx4938ide_port_info; irq = platform_get_irq(pdev, 0); @@ -242,38 +250,43 @@ static int __init tx4938ide_probe(struct platform_device *pdev) res->end - res->start + 1, "tx4938ide")) return -EBUSY; mapbase = (unsigned long)devm_ioremap(&pdev->dev, res->start, - res->end - res->start + 1); - if (!mapbase) + 8 << pdata->ioport_shift); + mapctl = (unsigned long)devm_ioremap(&pdev->dev, + res->start + 0x10000 + + (6 << pdata->ioport_shift), + 1 << pdata->ioport_shift); + if (!mapbase || !mapctl) return -EBUSY; memset(&hw, 0, sizeof(hw)); if (pdata->ioport_shift) { unsigned long port = mapbase; + unsigned long ctl = mapctl; hw.io_ports_array[0] = port; #ifdef __BIG_ENDIAN port++; + ctl++; #endif for (i = 1; i <= 7; i++) hw.io_ports_array[i] = port + (i << pdata->ioport_shift); - hw.io_ports.ctl_addr = - port + 0x10000 + (6 << pdata->ioport_shift); + hw.io_ports.ctl_addr = ctl; } else - ide_std_init_ports(&hw, mapbase, mapbase + 0x10006); + ide_std_init_ports(&hw, mapbase, mapctl); hw.irq = irq; hw.dev = &pdev->dev; - pr_info("TX4938 IDE interface (base %#lx, irq %d)\n", mapbase, hw.irq); + pr_info("TX4938 IDE interface (base %#lx, ctl %#lx, irq %d)\n", + mapbase, mapctl, hw.irq); if (pdata->gbus_clock) tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, 0); else d.port_ops = NULL; ret = ide_host_add(&d, hws, &host); - if (ret) - return ret; - platform_set_drvdata(pdev, host); - return 0; + if (!ret) + platform_set_drvdata(pdev, host); + return ret; } static int __exit tx4938ide_remove(struct platform_device *pdev) |