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(unknown [58.22.7.114]) by smtp.qiye.163.com (Hmail) with ESMTP id 62689e96; Thu, 19 Dec 2024 09:05:59 +0800 (GMT+08:00) From: Jon Lin To: broonie@kernel.org Cc: linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, heiko@sntech.de, jon.lin@rock-chips.com, linux-arm-kernel@lists.infradead.org, linux-spi@vger.kernel.org Subject: [PATCH] spi: rockchip-sfc: Using normal memory for dma Date: Thu, 19 Dec 2024 09:05:57 +0800 Message-Id: <20241219010557.333327-1-jon.lin@rock-chips.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-HM-Spam-Status: e1kfGhgUHx5ZQUpXWQgPGg8OCBgUHx5ZQUlOS1dZFg8aDwILHllBWSg2Ly tZV1koWUFDSUNOT01LS0k3V1ktWUFJV1kPCRoVCBIfWUFZQ08YGVYZHUgdSx0YSB8fTBlWFRQJFh oXVRMBExYaEhckFA4PWVdZGBILWUFZTkNVSUlVTFVKSk9ZV1kWGg8SFR0UWUFZT0tIVUpLSU9PT0 hVSktLVUpCS0tZBg++ X-HM-Tid: 0a93dc733a5309d9kunm62689e96 X-HM-MType: 1 X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6Kyo6ORw4DzIXDBc#Ijg8CioY NyxPCQFVSlVKTEhPTkxLSE1LTkpOVTMWGhIXVREUFVUXEhU7CRQYEFYYExILCFUYFBZFWVdZEgtZ QVlOQ1VJSVVMVUpKT1lXWQgBWUFIQklPNwY+ DKIM-Signature: a=rsa-sha256; b=ArX75nozRt5ddukmT6M0gsKqaaaB8H4Ibjvrsb6mEpLtcJQmI9/pulkmT3xAK4vXcLUZGwOyXq2W9s+s3GaC8SGOaEew7nDDFpR2f+lBL9haHufywCZSDKRVQgiScjVGljNZBTD+aZtTRDV8LH82+Md7PWXN0YV3Syp5lZZ5c+M=; c=relaxed/relaxed; s=default; d=rock-chips.com; v=1; bh=9WLo9P0p6Y1Vr7K+3r8P1YMOWdk5vWT9KA5P3lqs1TQ=; h=date:mime-version:subject:message-id:from; X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241218_170608_054953_80ECAE46 X-CRM114-Status: GOOD ( 12.96 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Nornal memory CPU copy with cache invalidate is more efficient than uncache memory copy. Signed-off-by: Jon Lin --- drivers/spi/spi-rockchip-sfc.c | 47 ++++++++++++++++++---------------- 1 file changed, 25 insertions(+), 22 deletions(-) diff --git a/drivers/spi/spi-rockchip-sfc.c b/drivers/spi/spi-rockchip-sfc.c index ca4f20283d23..36509bcccc27 100644 --- a/drivers/spi/spi-rockchip-sfc.c +++ b/drivers/spi/spi-rockchip-sfc.c @@ -156,10 +156,9 @@ #define SFC_MAX_CHIPSELECT_NUM 2 -/* The SFC can transfer max 16KB - 1 at one time - * we set it to 15.5KB here for alignment. - */ #define SFC_MAX_IOSIZE_VER3 (512 * 31) +/* Although up to 4GB, 64KB is enough with less mem reserved */ +#define SFC_MAX_IOSIZE_VER4 (0x10000U) /* DMA is only enabled for large data transmission */ #define SFC_DMA_TRANS_THRETHOLD (0x40) @@ -457,8 +456,10 @@ static int rockchip_sfc_xfer_data_dma(struct rockchip_sfc *sfc, dev_dbg(sfc->dev, "sfc xfer_dma len=%x\n", len); - if (op->data.dir == SPI_MEM_DATA_OUT) + if (op->data.dir == SPI_MEM_DATA_OUT) { memcpy(sfc->buffer, op->data.buf.out, len); + dma_sync_single_for_device(sfc->dev, sfc->dma_buffer, len, DMA_TO_DEVICE); + } ret = rockchip_sfc_fifo_transfer_dma(sfc, sfc->dma_buffer, len); if (!wait_for_completion_timeout(&sfc->cp, msecs_to_jiffies(2000))) { @@ -466,8 +467,11 @@ static int rockchip_sfc_xfer_data_dma(struct rockchip_sfc *sfc, ret = -ETIMEDOUT; } rockchip_sfc_irq_mask(sfc, SFC_IMR_DMA); - if (op->data.dir == SPI_MEM_DATA_IN) + + if (op->data.dir == SPI_MEM_DATA_IN) { + dma_sync_single_for_cpu(sfc->dev, sfc->dma_buffer, len, DMA_FROM_DEVICE); memcpy(op->data.buf.in, sfc->buffer, len); + } return ret; } @@ -633,19 +637,6 @@ static int rockchip_sfc_probe(struct platform_device *pdev) sfc->use_dma = !of_property_read_bool(sfc->dev->of_node, "rockchip,sfc-no-dma"); - if (sfc->use_dma) { - ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32)); - if (ret) { - dev_warn(dev, "Unable to set dma mask\n"); - return ret; - } - - sfc->buffer = dmam_alloc_coherent(dev, SFC_MAX_IOSIZE_VER3, - &sfc->dma_buffer, GFP_KERNEL); - if (!sfc->buffer) - return -ENOMEM; - } - ret = clk_prepare_enable(sfc->hclk); if (ret) { dev_err(&pdev->dev, "Failed to enable ahb clk\n"); @@ -676,8 +667,8 @@ static int rockchip_sfc_probe(struct platform_device *pdev) if (ret) goto err_irq; - sfc->max_iosize = rockchip_sfc_get_max_iosize(sfc); sfc->version = rockchip_sfc_get_version(sfc); + sfc->max_iosize = rockchip_sfc_get_max_iosize(sfc); pm_runtime_set_autosuspend_delay(dev, ROCKCHIP_AUTOSUSPEND_DELAY); pm_runtime_use_autosuspend(dev); @@ -685,16 +676,27 @@ static int rockchip_sfc_probe(struct platform_device *pdev) pm_runtime_enable(dev); pm_runtime_get_noresume(dev); + if (sfc->use_dma) { + sfc->buffer = (u8 *)__get_free_pages(GFP_KERNEL | GFP_DMA32, + get_order(sfc->max_iosize)); + if (!sfc->buffer) { + ret = -ENOMEM; + goto err_dma; + } + sfc->dma_buffer = virt_to_phys(sfc->buffer); + } + ret = devm_spi_register_controller(dev, host); if (ret) - goto err_pm_runtime_free; + goto err_register; pm_runtime_mark_last_busy(dev); pm_runtime_put_autosuspend(dev); return 0; - -err_pm_runtime_free: +err_register: + free_pages((unsigned long)sfc->buffer, get_order(sfc->max_iosize)); +err_dma: pm_runtime_get_sync(dev); pm_runtime_put_noidle(dev); pm_runtime_disable(dev); @@ -714,6 +716,7 @@ static void rockchip_sfc_remove(struct platform_device *pdev) struct spi_controller *host = sfc->host; spi_unregister_controller(host); + free_pages((unsigned long)sfc->buffer, get_order(sfc->max_iosize)); clk_disable_unprepare(sfc->clk); clk_disable_unprepare(sfc->hclk);