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Wed, 06 Nov 2019 06:08:43 -0800 (PST) From: Chuanhong Guo To: linux-mtd@lists.infradead.org Subject: [PATCH 1/2] mtd: mtk-quadspi: add support for memory-mapped flash reading Date: Wed, 6 Nov 2019 22:07:47 +0800 Message-Id: <20191106140748.13100-2-gch981213@gmail.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20191106140748.13100-1-gch981213@gmail.com> References: <20191106140748.13100-1-gch981213@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191106_060847_457626_D8A38094 X-CRM114-Status: GOOD ( 14.57 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , devicetree@vger.kernel.org, Vignesh Raghavendra , Tudor Ambarus , Richard Weinberger , linux-kernel@vger.kernel.org, Chuanhong Guo , Rob Herring , linux-mediatek@lists.infradead.org, Miquel Raynal , Matthias Brugger , Brian Norris , David Woodhouse , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org PIO reading mode on this controller is ridiculously inefficient (one cmd+addr+dummy sequence reads only one byte) This patch adds support for reading from memory-mapped flash area which increases reading speed from 1MB/s to 5.6MB/s Signed-off-by: Chuanhong Guo --- drivers/mtd/spi-nor/mtk-quadspi.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/mtd/spi-nor/mtk-quadspi.c b/drivers/mtd/spi-nor/mtk-quadspi.c index 34db01ab6cab..ba8b3be39896 100644 --- a/drivers/mtd/spi-nor/mtk-quadspi.c +++ b/drivers/mtd/spi-nor/mtk-quadspi.c @@ -106,6 +106,7 @@ struct mtk_nor { struct spi_nor nor; struct device *dev; void __iomem *base; /* nor flash base address */ + void __iomem *flash_base; struct clk *spi_clk; struct clk *nor_clk; }; @@ -272,6 +273,11 @@ static ssize_t mtk_nor_read(struct spi_nor *nor, loff_t from, size_t length, mtk_nor_set_read_mode(mtk_nor); mtk_nor_set_addr(mtk_nor, addr); + if (mtk_nor->flash_base) { + memcpy_fromio(buffer, mtk_nor->flash_base + from, length); + return length; + } + for (i = 0; i < length; i++) { ret = mtk_nor_execute_cmd(mtk_nor, MTK_NOR_PIO_READ_CMD); if (ret < 0) @@ -475,6 +481,11 @@ static int mtk_nor_drv_probe(struct platform_device *pdev) if (IS_ERR(mtk_nor->base)) return PTR_ERR(mtk_nor->base); + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + mtk_nor->flash_base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(mtk_nor->flash_base)) + mtk_nor->flash_base = NULL; + mtk_nor->spi_clk = devm_clk_get(&pdev->dev, "spi"); if (IS_ERR(mtk_nor->spi_clk)) return PTR_ERR(mtk_nor->spi_clk); -- 2.21.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel