From 909fefc2511120ec71178f752c195c7b0b30269e Mon Sep 17 00:00:00 2001 From: Sergei Shtylyov Date: Fri, 6 Jan 2012 20:45:45 +0300 Subject: [PATCH] pata_bf54x: fix BMIDE status register emulation The author of this driver clearly wasn't familiar with the BMIDE specification (also known as SFF-8038i) when he implemented the bmdma_status() method: first, the interrupt bit of the BMIDE status register corresponds to nothing else but INTRQ signal (ATAPI_DEV_INT here); second, the error bit is only set if the controller encounters issue doing the bus master transfers, not on the IDE DMA burst termination interrupts like here (moreover, setting the error bit doesn't cause an interrupt). We now need to disable all those unused interrupts... (The only thing I couldn't figure out is how to flush the FIFO to memory once the interrupt happens as required by the mentioned spec.) Signed-off-by: Sergei Shtylyov Signed-off-by: Sonic Zhang Signed-off-by: Jeff Garzik --- drivers/ata/pata_bf54x.c | 20 ++------------------ 1 file changed, 2 insertions(+), 18 deletions(-) diff --git a/drivers/ata/pata_bf54x.c b/drivers/ata/pata_bf54x.c index bd987bb082e..d6a4677fdf7 100644 --- a/drivers/ata/pata_bf54x.c +++ b/drivers/ata/pata_bf54x.c @@ -418,14 +418,6 @@ static void bfin_set_dmamode(struct ata_port *ap, struct ata_device *adev) (tcyc_tdvs<<8 | tdvs)); ATAPI_SET_ULTRA_TIM_2(base, (tmli<<8 | tss)); ATAPI_SET_ULTRA_TIM_3(base, (trp<<8 | tzah)); - - /* Enable host ATAPI Untra DMA interrupts */ - ATAPI_SET_INT_MASK(base, - ATAPI_GET_INT_MASK(base) - | UDMAIN_DONE_MASK - | UDMAOUT_DONE_MASK - | UDMAIN_TERM_MASK - | UDMAOUT_TERM_MASK); } } } @@ -470,10 +462,6 @@ static void bfin_set_dmamode(struct ata_port *ap, struct ata_device *adev) ATAPI_SET_MULTI_TIM_0(base, (tm<<8 | td)); ATAPI_SET_MULTI_TIM_1(base, (tkr<<8 | tkw)); ATAPI_SET_MULTI_TIM_2(base, (teoc<<8 | th)); - - /* Enable host ATAPI Multi DMA interrupts */ - ATAPI_SET_INT_MASK(base, ATAPI_GET_INT_MASK(base) - | MULTI_DONE_MASK | MULTI_TERM_MASK); SSYNC(); } } @@ -1153,15 +1141,11 @@ static unsigned char bfin_bmdma_status(struct ata_port *ap) { unsigned char host_stat = 0; void __iomem *base = (void __iomem *)ap->ioaddr.ctl_addr; - unsigned short int_status = ATAPI_GET_INT_STATUS(base); - if (ATAPI_GET_STATUS(base) & (MULTI_XFER_ON|ULTRA_XFER_ON)) + if (ATAPI_GET_STATUS(base) & (MULTI_XFER_ON | ULTRA_XFER_ON)) host_stat |= ATA_DMA_ACTIVE; - if (int_status & (MULTI_DONE_INT|UDMAIN_DONE_INT|UDMAOUT_DONE_INT| - ATAPI_DEV_INT)) + if (ATAPI_GET_INT_STATUS(base) & ATAPI_DEV_INT) host_stat |= ATA_DMA_INTR; - if (int_status & (MULTI_TERM_INT|UDMAIN_TERM_INT|UDMAOUT_TERM_INT)) - host_stat |= ATA_DMA_ERR|ATA_DMA_INTR; dev_dbg(ap->dev, "ATAPI: host_stat=0x%x\n", host_stat); -- 2.20.1