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Received: from relay3-d.mail.gandi.net ([217.70.183.195]) by merlin.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hjLDe-000144-7d; Fri, 05 Jul 2019 10:13:31 +0000 X-Originating-IP: 86.250.200.211 Received: from localhost.localdomain (lfbn-1-17395-211.w86-250.abo.wanadoo.fr [86.250.200.211]) (Authenticated sender: miquel.raynal@bootlin.com) by relay3-d.mail.gandi.net (Postfix) with ESMTPSA id 318986000D; Fri, 5 Jul 2019 10:12:38 +0000 (UTC) From: Miquel Raynal To: Richard Weinberger , David Woodhouse , Brian Norris , Marek Vasut , Tudor Ambarus , Vignesh Raghavendra , Maxime Ripard Subject: [PATCH 2/2] mtd: rawnand: sunxi: Add A23/A33 DMA support with extra MBUS configuration Date: Fri, 5 Jul 2019 12:12:32 +0200 Message-Id: <20190705101232.30164-2-miquel.raynal@bootlin.com> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190705101232.30164-1-miquel.raynal@bootlin.com> References: <20190705101232.30164-1-miquel.raynal@bootlin.com> MIME-Version: 1.0 X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Chen-Yu Tsai , linux-mtd@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Miquel Raynal Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org Allwinner NAND controllers can make use of DMA to enhance the I/O throughput thanks to ECC pipelining. DMA handling with A23/A33 NAND IP is a bit different than with the older SoCs, hence the introduction of a new compatible to handle: * the differences between register offsets, * the burst length change from 4 to minimum 8, * manage SRAM accesses through MBUS with extra configuration. Signed-off-by: Miquel Raynal --- drivers/mtd/nand/raw/sunxi_nand.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/drivers/mtd/nand/raw/sunxi_nand.c b/drivers/mtd/nand/raw/sunxi_nand.c index e93f39bc2bc5..89773293c64d 100644 --- a/drivers/mtd/nand/raw/sunxi_nand.c +++ b/drivers/mtd/nand/raw/sunxi_nand.c @@ -43,6 +43,7 @@ #define NFC_REG_RCMD_SET 0x0028 #define NFC_REG_WCMD_SET 0x002C #define NFC_REG_A10_IO_DATA 0x0030 +#define NFC_REG_A23_IO_DATA 0x0300 #define NFC_REG_ECC_CTL 0x0034 #define NFC_REG_ECC_ST 0x0038 #define NFC_REG_DEBUG 0x003C @@ -50,6 +51,7 @@ #define NFC_REG_USER_DATA(x) (0x0050 + ((x) * 4)) #define NFC_REG_SPARE_AREA 0x00A0 #define NFC_REG_PAT_ID 0x00A4 +#define NFC_REG_MDMA_CNT 0x00C4 #define NFC_RAM0_BASE 0x0400 #define NFC_RAM1_BASE 0x0800 @@ -68,6 +70,7 @@ #define NFC_PAGE_SHIFT(x) (((x) < 10 ? 0 : (x) - 10) << 8) #define NFC_SAM BIT(12) #define NFC_RAM_METHOD BIT(14) +#define NFC_DMA_TYPE_NORMAL BIT(15) #define NFC_DEBUG_CTL BIT(31) /* define bit use in NFC_ST */ @@ -204,10 +207,13 @@ static inline struct sunxi_nand_chip *to_sunxi_nand(struct nand_chip *nand) * NAND Controller capabilities structure: stores NAND controller capabilities * for distinction between compatible strings. * + * @extra_mbus_conf: Contrary to A10, A10s and A13, accessing internal RAM + * through MBUS on A23/A33 needs extra configuration. * @reg_io_data: I/O data register * @dma_maxburst: DMA maxburst */ struct sunxi_nfc_caps { + bool extra_mbus_conf; unsigned int reg_io_data; unsigned int dma_maxburst; }; @@ -367,6 +373,9 @@ static int sunxi_nfc_dma_op_prepare(struct sunxi_nfc *nfc, const void *buf, nfc->regs + NFC_REG_CTL); writel(nchunks, nfc->regs + NFC_REG_SECTOR_NUM); writel(chunksize, nfc->regs + NFC_REG_CNT); + if (nfc->caps->extra_mbus_conf) + writel(chunksize * nchunks, nfc->regs + NFC_REG_MDMA_CNT); + dmat = dmaengine_submit(dmad); ret = dma_submit_error(dmat); @@ -2127,6 +2136,11 @@ static int sunxi_nfc_probe(struct platform_device *pdev) dmac_cfg.src_maxburst = nfc->caps->dma_maxburst; dmac_cfg.dst_maxburst = nfc->caps->dma_maxburst; dmaengine_slave_config(nfc->dmac, &dmac_cfg); + + if (nfc->caps->extra_mbus_conf) + writel(readl(nfc->regs + NFC_REG_CTL) | + NFC_DMA_TYPE_NORMAL, nfc->regs + NFC_REG_CTL); + } else { dev_warn(dev, "failed to request rxtx DMA channel\n"); } @@ -2175,11 +2189,21 @@ static const struct sunxi_nfc_caps sunxi_nfc_a10_caps = { .dma_maxburst = 4, }; +static const struct sunxi_nfc_caps sunxi_nfc_a23_caps = { + .extra_mbus_conf = true, + .reg_io_data = NFC_REG_A23_IO_DATA, + .dma_maxburst = 8, +}; + static const struct of_device_id sunxi_nfc_ids[] = { { .compatible = "allwinner,sun4i-a10-nand", .data = &sunxi_nfc_a10_caps, }, + { + .compatible = "allwinner,sun8i-a23-nand-controller", + .data = &sunxi_nfc_a23_caps, + }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, sunxi_nfc_ids); -- 2.19.1 ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/