From mboxrd@z Thu Jan 1 00:00:00 1970 From: shijie8@gmail.com (Huang Shijie) Date: Sat, 21 Dec 2013 00:02:29 +0800 Subject: [PATCH 3/4] mtd: nand: kill the the NAND_MAX_PAGESIZE/NAND_MAX_OOBSIZE for nand_buffers{} In-Reply-To: <1387555350-989-1-git-send-email-shijie8@gmail.com> References: <1387555350-989-1-git-send-email-shijie8@gmail.com> Message-ID: <1387555350-989-4-git-send-email-shijie8@gmail.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org The patch converts the arrays to buffer pointers for nand_buffers{}. The cafe_nand.c is the only NAND_OWN_BUFFERS user which allocates a nand_buffers{} itself. This patch disables the DMA for nand_scan_ident, and restore the DMA status after we finish the nand_scan_ident. By this way, we can get the mtd->writesize and mtd->oobsize, and then allocates the cafe->dmabuf with them. Since the cafe_nand.c uses the NAND_ECC_HW_SYNDROME ECC mode, we do not allocate the buffers for @ecccalc and @ecccode. Signed-off-by: Huang Shijie --- drivers/mtd/nand/cafe_nand.c | 49 ++++++++++++++++++++++++++++++++------------ drivers/mtd/nand/nand_base.c | 19 +++++++++++++---- include/linux/mtd/nand.h | 12 +++++------ 3 files changed, 57 insertions(+), 23 deletions(-) diff --git a/drivers/mtd/nand/cafe_nand.c b/drivers/mtd/nand/cafe_nand.c index c34985a..e9186e7 100644 --- a/drivers/mtd/nand/cafe_nand.c +++ b/drivers/mtd/nand/cafe_nand.c @@ -627,6 +627,8 @@ static int cafe_nand_probe(struct pci_dev *pdev, struct cafe_priv *cafe; uint32_t ctrl; int err = 0; + int old_dma; + struct nand_buffers *nbuf; /* Very old versions shared the same PCI ident for all three functions on the chip. Verify the class too... */ @@ -657,13 +659,6 @@ static int cafe_nand_probe(struct pci_dev *pdev, err = -ENOMEM; goto out_free_mtd; } - cafe->dmabuf = dma_alloc_coherent(&cafe->pdev->dev, 2112 + sizeof(struct nand_buffers), - &cafe->dmaaddr, GFP_KERNEL); - if (!cafe->dmabuf) { - err = -ENOMEM; - goto out_ior; - } - cafe->nand.buffers = (void *)cafe->dmabuf + 2112; cafe->rs = init_rs_non_canonical(12, &cafe_mul, 0, 1, 8); if (!cafe->rs) { @@ -723,7 +718,7 @@ static int cafe_nand_probe(struct pci_dev *pdev, "CAFE NAND", mtd); if (err) { dev_warn(&pdev->dev, "Could not register IRQ %d\n", pdev->irq); - goto out_free_dma; + goto out_ior; } /* Disable master reset, enable NAND clock */ @@ -753,12 +748,34 @@ static int cafe_nand_probe(struct pci_dev *pdev, cafe_dev_dbg(&cafe->pdev->dev, "Control %x, IRQ mask %x\n", cafe_readl(cafe, GLOBAL_CTRL), cafe_readl(cafe, GLOBAL_IRQ_MASK)); + /* Do not use the DMA for the nand_scan_ident() */ + old_dma = usedma; + usedma = 0; + /* Scan to find existence of the device */ if (nand_scan_ident(mtd, 2, NULL)) { err = -ENXIO; goto out_irq; } + cafe->dmabuf = dma_alloc_coherent(&cafe->pdev->dev, + 2112 + sizeof(struct nand_buffers) + + mtd->writesize + mtd->oobsize, + &cafe->dmaaddr, GFP_KERNEL); + if (!cafe->dmabuf) { + err = -ENOMEM; + goto out_irq; + } + cafe->nand.buffers = nbuf = (void *)cafe->dmabuf + 2112; + + /* this driver does not need the @ecccalc and @ecccode */ + nbuf->ecccalc = NULL; + nbuf->ecccode = NULL; + nbuf->databuf = (uint8_t *)(nbuf + 1); + + /* Restore the DMA flag */ + usedma = old_dma; + cafe->ctl2 = 1<<27; /* Reed-Solomon ECC */ if (mtd->writesize == 2048) cafe->ctl2 |= 1<<29; /* 2KiB page size */ @@ -775,7 +792,7 @@ static int cafe_nand_probe(struct pci_dev *pdev, } else { printk(KERN_WARNING "Unexpected NAND flash writesize %d. Aborting\n", mtd->writesize); - goto out_irq; + goto out_free_dma; } cafe->nand.ecc.mode = NAND_ECC_HW_SYNDROME; cafe->nand.ecc.size = mtd->writesize; @@ -792,7 +809,7 @@ static int cafe_nand_probe(struct pci_dev *pdev, err = nand_scan_tail(mtd); if (err) - goto out_irq; + goto out_free_dma; pci_set_drvdata(pdev, mtd); @@ -801,12 +818,15 @@ static int cafe_nand_probe(struct pci_dev *pdev, goto out; + out_free_dma: + dma_free_coherent(&cafe->pdev->dev, + 2112 + sizeof(struct nand_buffers) + + mtd->writesize + mtd->oobsize, + cafe->dmabuf, cafe->dmaaddr); out_irq: /* Disable NAND IRQ in global IRQ mask register */ cafe_writel(cafe, ~1 & cafe_readl(cafe, GLOBAL_IRQ_MASK), GLOBAL_IRQ_MASK); free_irq(pdev->irq, mtd); - out_free_dma: - dma_free_coherent(&cafe->pdev->dev, 2112, cafe->dmabuf, cafe->dmaaddr); out_ior: pci_iounmap(pdev, cafe->mmio); out_free_mtd: @@ -826,7 +846,10 @@ static void cafe_nand_remove(struct pci_dev *pdev) nand_release(mtd); free_rs(cafe->rs); pci_iounmap(pdev, cafe->mmio); - dma_free_coherent(&cafe->pdev->dev, 2112, cafe->dmabuf, cafe->dmaaddr); + dma_free_coherent(&cafe->pdev->dev, + 2112 + sizeof(struct nand_buffers) + + mtd->writesize + mtd->oobsize, + cafe->dmabuf, cafe->dmaaddr); kfree(mtd); } diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index 9b3bb3c..02d6707 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -3559,15 +3559,26 @@ int nand_scan_tail(struct mtd_info *mtd) int i; struct nand_chip *chip = mtd->priv; struct nand_ecc_ctrl *ecc = &chip->ecc; + struct nand_buffers *nbuf; /* New bad blocks should be marked in OOB, flash-based BBT, or both */ BUG_ON((chip->bbt_options & NAND_BBT_NO_OOB_BBM) && !(chip->bbt_options & NAND_BBT_USE_FLASH)); - if (!(chip->options & NAND_OWN_BUFFERS)) - chip->buffers = kmalloc(sizeof(*chip->buffers), GFP_KERNEL); - if (!chip->buffers) - return -ENOMEM; + if (!(chip->options & NAND_OWN_BUFFERS)) { + nbuf = kzalloc(sizeof(*nbuf) + mtd->writesize + + mtd->oobsize * 3, GFP_KERNEL); + if (!nbuf) + return -ENOMEM; + nbuf->ecccalc = (uint8_t *)(nbuf + 1); + nbuf->ecccode = nbuf->ecccalc + mtd->oobsize; + nbuf->databuf = nbuf->ecccode + mtd->oobsize; + + chip->buffers = nbuf; + } else { + if (!chip->buffers) + return -ENOMEM; + } /* Set the internal oob buffer location, just after the page data */ chip->oob_poi = chip->buffers->databuf + mtd->writesize; diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h index f3ea8da..4bbcaba 100644 --- a/include/linux/mtd/nand.h +++ b/include/linux/mtd/nand.h @@ -411,17 +411,17 @@ struct nand_ecc_ctrl { /** * struct nand_buffers - buffer structure for read/write - * @ecccalc: buffer for calculated ECC - * @ecccode: buffer for ECC read from flash - * @databuf: buffer for data - dynamically sized + * @ecccalc: buffer pointer for calculated ECC, size is oobsize. + * @ecccode: buffer pointer for ECC read from flash, size is oobsize. + * @databuf: buffer pointer for data, size is (page size + oobsize). * * Do not change the order of buffers. databuf and oobrbuf must be in * consecutive order. */ struct nand_buffers { - uint8_t ecccalc[NAND_MAX_OOBSIZE]; - uint8_t ecccode[NAND_MAX_OOBSIZE]; - uint8_t databuf[NAND_MAX_PAGESIZE + NAND_MAX_OOBSIZE]; + uint8_t *ecccalc; + uint8_t *ecccode; + uint8_t *databuf; }; /** -- 1.8.3.1