From patchwork Thu May 1 09:56:33 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lee Jones X-Patchwork-Id: 344472 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 0145A14008D for ; Thu, 1 May 2014 19:59:57 +1000 (EST) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1Wfnlx-0004il-M0; Thu, 01 May 2014 09:59:21 +0000 Received: from mail-wi0-f175.google.com ([209.85.212.175]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Wfnl1-0002zs-SH for linux-mtd@lists.infradead.org; Thu, 01 May 2014 09:58:24 +0000 Received: by mail-wi0-f175.google.com with SMTP id cc10so407176wib.14 for ; Thu, 01 May 2014 02:58:01 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=KEL0iruXfMAASshOU3QG6z0L/M9PCnpy+9w73Hc/Uas=; b=CTsHDjDfftKsbCwZTwggLKQQOohNRuFsomLI7fauYzdCVWCyXTR2/PublqPqCCa0Vh NFszrb6MeZy4Mybhvgo2VKofQjsCq7Er+Jd1QhqpcOa2ZpETj6f5M+cFkoYC9FkCWUCT f4IAnJ9zSSTR5YliPmdDJ/oNWSE8QrDu16sMpan3LTpdNO+vYYU2ihknH12LZo+BiXbd G/HBH3zDGYGlSdt9fu0I0BoxR3xNlp59L89x0zGGaOvMQGQYYTgIqcbLoxwrytWo6xq9 CLb4wSknNXE0fE0XIthdMk9mctNDvm1tLHSa7TTL+xSTI8Z01urOt6Zv3xUsqKxGpQk5 Od6Q== X-Gm-Message-State: ALoCoQlFlOlf5/acs4NU8rKZ4ENXifDeM8sZ5fWYdTbYuUAGM+99ZXzilhb1+sPTBhEqedDHn74C X-Received: by 10.180.85.134 with SMTP id h6mr1528599wiz.44.1398938281694; Thu, 01 May 2014 02:58:01 -0700 (PDT) Received: from lee--X1.home (host109-148-238-223.range109-148.btcentralplus.com. [109.148.238.223]) by mx.google.com with ESMTPSA id bj5sm2696494wib.3.2014.05.01.02.57.59 for (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 01 May 2014 02:58:00 -0700 (PDT) From: Lee Jones To: linux-kernel@vger.kernel.org Subject: [PATCH 26/47] mtd: nand: stm_nand_bch: provide write functionality (BCH) Date: Thu, 1 May 2014 10:56:33 +0100 Message-Id: <1398938214-17847-27-git-send-email-lee.jones@linaro.org> X-Mailer: git-send-email 1.8.3.2 In-Reply-To: <1398938214-17847-1-git-send-email-lee.jones@linaro.org> References: <1398938214-17847-1-git-send-email-lee.jones@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140501_025824_076003_2EC3E871 X-CRM114-Status: GOOD ( 13.58 ) X-Spam-Score: -0.7 (/) X-Spam-Report: SpamAssassin version 3.3.2 on bombadil.infradead.org summary: Content analysis details: (-0.7 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [209.85.212.175 listed in list.dnswl.org] Cc: Lee Jones , computersforpeace@gmail.com, linux-mtd@lists.infradead.org, kernel@stlinux.com X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-mtd" Errors-To: linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org Use DMA to write a single page of data. Signed-off-by: Lee Jones --- drivers/mtd/nand/stm_nand_bch.c | 76 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+) diff --git a/drivers/mtd/nand/stm_nand_bch.c b/drivers/mtd/nand/stm_nand_bch.c index 72c9734..e875446 100644 --- a/drivers/mtd/nand/stm_nand_bch.c +++ b/drivers/mtd/nand/stm_nand_bch.c @@ -606,6 +606,81 @@ static int bch_read(struct mtd_info *mtd, struct nand_chip *chip, return ret; } +/* Returns the status of the NAND device following the write operation */ +static uint8_t bch_write_page(struct nandi_controller *nandi, + loff_t offs, const uint8_t *buf) +{ + struct bch_prog *prog = &bch_prog_write_page; + uint32_t page_size = nandi->info.mtd.writesize; + uint8_t *p = (uint8_t *)buf; + unsigned long list_phys; + unsigned long buf_phys; + uint8_t status; + bool bounce = false; + + dev_dbg(nandi->dev, "%s: offs = 0x%012llx\n", __func__, offs); + + BUG_ON(offs & (page_size - 1)); + + if (((unsigned long)buf & (NANDI_BCH_DMA_ALIGNMENT - 1)) || + !virt_addr_valid(buf)) { /* vmalloc'd buffer! */ + bounce = true; + } + + if (bounce) { + memcpy(nandi->page_buf, buf, page_size); + p = nandi->page_buf; + nandi->cached_page = -1; + } + + emiss_nandi_select(STM_NANDI_BCH); + + nandi_enable_interrupts(nandi, NANDBCH_INT_SEQNODESOVER); + reinit_completion(&nandi->seq_completed); + + prog->addr = (uint32_t)((offs >> (nandi->page_shift - 8)) & 0xffffff00); + + buf_phys = dma_map_single(NULL, p, page_size, DMA_TO_DEVICE); + memset(nandi->buf_list, 0x00, NANDI_BCH_BUF_LIST_SIZE); + nandi->buf_list[0] = buf_phys | (nandi->sectors_per_page - 1); + + list_phys = dma_map_single(NULL, nandi->buf_list, + NANDI_BCH_BUF_LIST_SIZE, DMA_TO_DEVICE); + + writel(list_phys, nandi->base + NANDBCH_BUFFER_LIST_PTR); + + bch_load_prog_cpu(nandi, prog); + + bch_wait_seq(nandi); + + nandi_disable_interrupts(nandi, NANDBCH_INT_SEQNODESOVER); + + dma_unmap_single(NULL, list_phys, NANDI_BCH_BUF_LIST_SIZE, + DMA_TO_DEVICE); + dma_unmap_single(NULL, buf_phys, page_size, DMA_FROM_DEVICE); + + status = (uint8_t)(readl(nandi->base + + NANDBCH_CHECK_STATUS_REG_A) & 0xff); + + return status; +} + +static int bch_write(struct mtd_info *mtd, struct nand_chip *chip, + uint32_t offset, int data_len, const uint8_t *buf, + int oob_required, int page, int cached, int raw) +{ + struct nandi_controller *nandi = chip->priv; + uint32_t page_size = mtd->writesize; + loff_t offs = page * page_size; + int ret; + + ret = bch_write_page(nandi, offs, buf); + if (ret & NAND_STATUS_FAIL) + return -EIO; + + return 0; +} + /* * Initialisation */ @@ -686,6 +761,7 @@ static void nandi_set_mtd_defaults(struct nandi_controller *nandi, mtd->subpage_sft = 0; chip->ecc.read_page = bch_read; + chip->write_page = bch_write; } /*