From: Sergei Shtylyov Date: Sat, 5 May 2007 20:03:49 +0000 (+0200) Subject: sl82c105: DMA support code cleanup (take 4) X-Git-Tag: v2.6.22-rc1~1030 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=688a87d145e04f6761c63e7f2e19fd9b3e4ca060;p=linux-2.6 sl82c105: DMA support code cleanup (take 4) Fold the now equivalent code in the ide_dma_check() method into a mere call to ide_use_dma(). Make config_for_dma() return non-zero if DMA mode has been set and call it from the ide_dma_check() method instead of ide_dma_on(). Defer writing the DMA timings to the chip registers until DMA is really turned on (and do not enable IORDY for DMA). Remove unneeded code from the init_hwif() method, improve its overall looks. Rename the dma_start(), ide_dma_check(), and ide_dma_lostirq() methods, and also use more proper hwif->dma_command, fix printk() and comment in the latter one as well. While at it, cleanup style in several places. Signed-off-by: Sergei Shtylyov Signed-off-by: Bartlomiej Zolnierkiewicz --- diff --git a/drivers/ide/pci/sl82c105.c b/drivers/ide/pci/sl82c105.c index ee6dd45a9b..fe3b4b91f8 100644 --- a/drivers/ide/pci/sl82c105.c +++ b/drivers/ide/pci/sl82c105.c @@ -100,59 +100,28 @@ static u8 sl82c105_tune_pio(ide_drive_t *drive, u8 pio) } /* - * Configure the drive and the chipset for DMA + * Configure the drive for DMA. + * We'll program the chipset only when DMA is actually turned on. */ -static int config_for_dma (ide_drive_t *drive) +static int config_for_dma(ide_drive_t *drive) { - ide_hwif_t *hwif = HWIF(drive); - struct pci_dev *dev = hwif->pci_dev; - unsigned int reg; - DBG(("config_for_dma(drive:%s)\n", drive->name)); - reg = (hwif->channel ? 0x4c : 0x44) + (drive->select.b.unit ? 4 : 0); - if (ide_config_drive_speed(drive, XFER_MW_DMA_2) != 0) - return 1; + return 0; - pci_write_config_word(dev, reg, 0x0240); - - return 0; + return ide_dma_enable(drive); } /* - * Check to see if the drive and - * chipset is capable of DMA mode + * Check to see if the drive and chipset are capable of DMA mode. */ - -static int sl82c105_check_drive (ide_drive_t *drive) +static int sl82c105_ide_dma_check(ide_drive_t *drive) { - ide_hwif_t *hwif = HWIF(drive); - - DBG(("sl82c105_check_drive(drive:%s)\n", drive->name)); - - do { - struct hd_driveid *id = drive->id; + DBG(("sl82c105_ide_dma_check(drive:%s)\n", drive->name)); - if (!drive->autodma) - break; - - if (!id || !(id->capability & 1)) - break; - - /* Consult the list of known "bad" drives */ - if (__ide_dma_bad_drive(drive)) - break; - - if (id->field_valid & 2) { - if ((id->dma_mword & hwif->mwdma_mask) || - (id->dma_1word & hwif->swdma_mask)) - return 0; - } - - if (__ide_dma_good_drive(drive) && id->eide_dma_time < 150) - return 0; - } while (0); + if (ide_use_dma(drive) && config_for_dma(drive)) + return 0; return -1; } @@ -181,14 +150,14 @@ static inline void sl82c105_reset_host(struct pci_dev *dev) * This function is called when the IDE timer expires, the drive * indicates that it is READY, and we were waiting for DMA to complete. */ -static int sl82c105_ide_dma_lost_irq(ide_drive_t *drive) +static int sl82c105_ide_dma_lostirq(ide_drive_t *drive) { - ide_hwif_t *hwif = HWIF(drive); - struct pci_dev *dev = hwif->pci_dev; - u32 val, mask = hwif->channel ? CTRL_IDE_IRQB : CTRL_IDE_IRQA; - unsigned long dma_base = hwif->dma_base; + ide_hwif_t *hwif = HWIF(drive); + struct pci_dev *dev = hwif->pci_dev; + u32 val, mask = hwif->channel ? CTRL_IDE_IRQB : CTRL_IDE_IRQA; + u8 dma_cmd; - printk("sl82c105: lost IRQ: resetting host\n"); + printk("sl82c105: lost IRQ, resetting host\n"); /* * Check the raw interrupt from the drive. @@ -201,15 +170,15 @@ static int sl82c105_ide_dma_lost_irq(ide_drive_t *drive) * Was DMA enabled? If so, disable it - we're resetting the * host. The IDE layer will be handling the drive for us. */ - val = inb(dma_base); - if (val & 1) { - outb(val & ~1, dma_base); + dma_cmd = inb(hwif->dma_command); + if (dma_cmd & 1) { + outb(dma_cmd & ~1, hwif->dma_command); printk("sl82c105: DMA was enabled\n"); } sl82c105_reset_host(dev); - /* ide_dmaproc would return 1, so we do as well */ + /* __ide_dma_lostirq would return 1, so we do as well */ return 1; } @@ -221,10 +190,10 @@ static int sl82c105_ide_dma_lost_irq(ide_drive_t *drive) * The generic IDE core will have disabled the BMEN bit before this * function is called. */ -static void sl82c105_ide_dma_start(ide_drive_t *drive) +static void sl82c105_dma_start(ide_drive_t *drive) { - ide_hwif_t *hwif = HWIF(drive); - struct pci_dev *dev = hwif->pci_dev; + ide_hwif_t *hwif = HWIF(drive); + struct pci_dev *dev = hwif->pci_dev; sl82c105_reset_host(dev); ide_dma_start(drive); @@ -232,8 +201,8 @@ static void sl82c105_ide_dma_start(ide_drive_t *drive) static int sl82c105_ide_dma_timeout(ide_drive_t *drive) { - ide_hwif_t *hwif = HWIF(drive); - struct pci_dev *dev = hwif->pci_dev; + ide_hwif_t *hwif = HWIF(drive); + struct pci_dev *dev = hwif->pci_dev; DBG(("sl82c105_ide_dma_timeout(drive:%s)\n", drive->name)); @@ -241,14 +210,20 @@ static int sl82c105_ide_dma_timeout(ide_drive_t *drive) return __ide_dma_timeout(drive); } -static int sl82c105_ide_dma_on (ide_drive_t *drive) +static int sl82c105_ide_dma_on(ide_drive_t *drive) { + struct pci_dev *dev = HWIF(drive)->pci_dev; + int rc, reg = 0x44 + drive->dn * 4; + DBG(("sl82c105_ide_dma_on(drive:%s)\n", drive->name)); - if (config_for_dma(drive)) - return 1; - printk(KERN_INFO "%s: DMA enabled\n", drive->name); - return __ide_dma_on(drive); + rc = __ide_dma_on(drive); + if (rc == 0) { + pci_write_config_word(dev, reg, 0x0200); + + printk(KERN_INFO "%s: DMA enabled\n", drive->name); + } + return rc; } static void sl82c105_dma_off_quietly(ide_drive_t *drive) @@ -272,8 +247,8 @@ static void sl82c105_dma_off_quietly(ide_drive_t *drive) */ static void sl82c105_selectproc(ide_drive_t *drive) { - ide_hwif_t *hwif = HWIF(drive); - struct pci_dev *dev = hwif->pci_dev; + ide_hwif_t *hwif = HWIF(drive); + struct pci_dev *dev = hwif->pci_dev; u32 val, old, mask; //DBG(("sl82c105_selectproc(drive:%s)\n", drive->name)); @@ -373,7 +348,7 @@ static unsigned int __devinit init_chipset_sl82c105(struct pci_dev *dev, const c } /* - * Initialise the chip + * Initialise IDE channel */ static void __devinit init_hwif_sl82c105(ide_hwif_t *hwif) { @@ -398,11 +373,6 @@ static void __devinit init_hwif_sl82c105(ide_hwif_t *hwif) */ hwif->drives[0].autotune = hwif->drives[1].autotune = 1; - hwif->atapi_dma = 0; - hwif->mwdma_mask = 0; - hwif->swdma_mask = 0; - hwif->autodma = 0; - if (!hwif->dma_base) return; @@ -412,27 +382,27 @@ static void __devinit init_hwif_sl82c105(ide_hwif_t *hwif) * Never ever EVER under any circumstances enable * DMA when the bridge is this old. */ - printk(" %s: Winbond 553 bridge revision %d, BM-DMA disabled\n", - hwif->name, rev); - } else { - hwif->atapi_dma = 1; - hwif->mwdma_mask = 0x04; - - hwif->ide_dma_check = &sl82c105_check_drive; - hwif->ide_dma_on = &sl82c105_ide_dma_on; - hwif->dma_off_quietly = &sl82c105_dma_off_quietly; - hwif->ide_dma_lostirq = &sl82c105_ide_dma_lost_irq; - hwif->dma_start = &sl82c105_ide_dma_start; - hwif->ide_dma_timeout = &sl82c105_ide_dma_timeout; - - if (!noautodma) - hwif->autodma = 1; - hwif->drives[0].autodma = hwif->autodma; - hwif->drives[1].autodma = hwif->autodma; - - if (hwif->mate) - hwif->serialized = hwif->mate->serialized = 1; + printk(" %s: Winbond W83C553 bridge revision %d, " + "BM-DMA disabled\n", hwif->name, rev); + return; } + + hwif->atapi_dma = 1; + hwif->mwdma_mask = 0x04; + + hwif->ide_dma_check = &sl82c105_ide_dma_check; + hwif->ide_dma_on = &sl82c105_ide_dma_on; + hwif->dma_off_quietly = &sl82c105_dma_off_quietly; + hwif->ide_dma_lostirq = &sl82c105_ide_dma_lostirq; + hwif->dma_start = &sl82c105_dma_start; + hwif->ide_dma_timeout = &sl82c105_ide_dma_timeout; + + if (!noautodma) + hwif->autodma = 1; + hwif->drives[0].autodma = hwif->drives[1].autodma = hwif->autodma; + + if (hwif->mate) + hwif->serialized = hwif->mate->serialized = 1; } static ide_pci_device_t sl82c105_chipset __devinitdata = {