linux-kernel - [PATCH v2 4/5] spi: spi-mtk-nor: support 36bit dma addressing to mediatek

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Message-Id: <20200918162834.v2.4.Id1cb208392928afc7ceed4de06924243c7858cd0@changeid>
Date:   Fri, 18 Sep 2020 16:31:22 +0800
From:   Ikjoon Jang <ikjn@...omium.org>
To:     Rob Herring <robh+dt@...nel.org>, Mark Brown <broonie@...nel.org>,
        devicetree@...r.kernel.org, linux-spi@...r.kernel.org,
        linux-mtd@...ts.infradead.org
Cc:     Ikjoon Jang <ikjn@...omium.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org
Subject: [PATCH v2 4/5] spi: spi-mtk-nor: support 36bit dma addressing to mediatek

This patch enables 36bit dma address support to spi-mtk-nor.
Currently 36bit dma addressing is enabled only for mt8192-nor.

Signed-off-by: Ikjoon Jang <ikjn@...omium.org>
---

(no changes since v1)

 drivers/spi/spi-mtk-nor.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-mtk-nor.c b/drivers/spi/spi-mtk-nor.c
index e14798a6e7d0..99dd5dca744e 100644
--- a/drivers/spi/spi-mtk-nor.c
+++ b/drivers/spi/spi-mtk-nor.c
@@ -78,6 +78,8 @@
 #define MTK_NOR_REG_DMA_FADR		0x71c
 #define MTK_NOR_REG_DMA_DADR		0x720
 #define MTK_NOR_REG_DMA_END_DADR	0x724
+#define MTK_NOR_REG_DMA_DADR_HB		0x738
+#define MTK_NOR_REG_DMA_END_DADR_HB	0x73c
 
 #define MTK_NOR_PRG_MAX_SIZE		6
 // Reading DMA src/dst addresses have to be 16-byte aligned
@@ -102,6 +104,7 @@ struct mtk_nor {
 	unsigned int spi_freq;
 	bool wbuf_en;
 	bool has_irq;
+	bool high_dma;
 	struct completion op_done;
 };
 
@@ -291,6 +294,11 @@ static int read_dma(struct mtk_nor *sp, u32 from, unsigned int length,
 	writel(dma_addr, sp->base + MTK_NOR_REG_DMA_DADR);
 	writel(dma_addr + length, sp->base + MTK_NOR_REG_DMA_END_DADR);
 
+	if (sp->high_dma) {
+		writel(dma_addr >> 32, sp->base + MTK_NOR_REG_DMA_DADR_HB);
+		writel((dma_addr + length) >> 32, sp->base + MTK_NOR_REG_DMA_END_DADR_HB);
+	}
+
 	if (sp->has_irq) {
 		reinit_completion(&sp->op_done);
 		mtk_nor_rmw(sp, MTK_NOR_REG_IRQ_EN, MTK_NOR_IRQ_DMA, 0);
@@ -594,7 +602,8 @@ static const struct spi_controller_mem_ops mtk_nor_mem_ops = {
 };
 
 static const struct of_device_id mtk_nor_match[] = {
-	{ .compatible = "mediatek,mt8173-nor" },
+	{ .compatible = "mediatek,mt8192-nor", .data = (void *)36 },
+	{ .compatible = "mediatek,mt8173-nor", .data = (void *)32 },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, mtk_nor_match);
@@ -607,6 +616,7 @@ static int mtk_nor_probe(struct platform_device *pdev)
 	u8 *buffer;
 	struct clk *spi_clk, *ctlr_clk;
 	int ret, irq;
+	unsigned long dma_bits;
 
 	base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(base))
@@ -623,6 +633,13 @@ static int mtk_nor_probe(struct platform_device *pdev)
 	buffer = devm_kmalloc(&pdev->dev,
 			      MTK_NOR_BOUNCE_BUF_SIZE + MTK_NOR_DMA_ALIGN,
 			      GFP_KERNEL);
+
+	dma_bits = (unsigned long)of_device_get_match_data(&pdev->dev);
+	if (dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(dma_bits))) {
+		dev_err(&pdev->dev, "failed to set dma mask(%lu)\n", dma_bits);
+		return -EINVAL;
+	}
+
 	if (!buffer)
 		return -ENOMEM;
 
-- 
2.28.0.681.g6f77f65b4e-goog