diff mbox series

[v3,5/6] spi: spi-mtk-nor: support 36bit dma addressing

Message ID 20200925145255.v3.5.Id1cb208392928afc7ceed4de06924243c7858cd0@changeid
State Superseded
Headers show
Series spi: spi-mtk-nor: Add mt8192 support | expand

Commit Message

Ikjoon Jang Sept. 25, 2020, 6:54 a.m. UTC 
This patch enables 36bit dma address support to spi-mtk-nor.
Currently this is enabled only for mt8192-nor.

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

(no changes since v1)

 drivers/spi/spi-mtk-nor.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

Comments

Chuanhong Guo Sept. 25, 2020, 8:26 a.m. UTC | #1 
Hi!

On Fri, Sep 25, 2020 at 2:56 PM Ikjoon Jang <ikjn@chromium.org> wrote:
>
> This patch enables 36bit dma address support to spi-mtk-nor.
> Currently this is enabled only for mt8192-nor.
>
> Signed-off-by: Ikjoon Jang <ikjn@chromium.org>
> ---
>
> (no changes since v1)
>
>  drivers/spi/spi-mtk-nor.c | 18 +++++++++++++++++-
>  1 file changed, 17 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/spi/spi-mtk-nor.c b/drivers/spi/spi-mtk-nor.c
> index 8dbafee7f431..35205635ed42 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
>
>  /* maximum bytes of TX in PRG mode */
>  #define MTK_NOR_PRG_MAX_SIZE           6
> @@ -106,6 +108,7 @@ struct mtk_nor {
>         unsigned int spi_freq;
>         bool wbuf_en;
>         bool has_irq;
> +       bool high_dma;
>         struct completion op_done;
>  };
>
> @@ -305,6 +308,11 @@ static int mtk_nor_dma_exec(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);
> +       }

I remembered kbuild test robot reported a warning on this on 32-bit platforms
in your v1. [0]
I don't know what's the fix for this though :(

[0] https://marc.info/?l=linux-spi&m=159982425706940&w=2
Ikjoon Jang Sept. 25, 2020, 9:11 a.m. UTC | #2 
On Fri, Sep 25, 2020 at 4:27 PM Chuanhong Guo <gch981213@gmail.com> wrote:
>

[snip]

> > +       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);
> > +       }
>
> I remembered kbuild test robot reported a warning on this on 32-bit platforms
> in your v1. [0]
> I don't know what's the fix for this though :(
>
> [0] https://marc.info/?l=linux-spi&m=159982425706940&w=2

yeah, I'm not sure how to handle this properly,

"warning: shift count >= width of type",
(sp->high_dma) is always false on 32bit arm kernel.
I think adding size check on here is unnecessary, should I fix for this warning?

> --
> Regards,
> Chuanhong Guo

Sorry for resending, Chuanhong.
Yingjoe Chen Sept. 27, 2020, 8:30 a.m. UTC | #3 
On Fri, 2020-09-25 at 14:54 +0800, Ikjoon Jang wrote:
> This patch enables 36bit dma address support to spi-mtk-nor.
> Currently this is enabled only for mt8192-nor.
> 
> Signed-off-by: Ikjoon Jang <ikjn@chromium.org>
> ---
> 
> (no changes since v1)
> 
>  drivers/spi/spi-mtk-nor.c | 18 +++++++++++++++++-
>  1 file changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/spi/spi-mtk-nor.c b/drivers/spi/spi-mtk-nor.c
> index 8dbafee7f431..35205635ed42 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
>  
>  /* maximum bytes of TX in PRG mode */
>  #define MTK_NOR_PRG_MAX_SIZE		6
> @@ -106,6 +108,7 @@ struct mtk_nor {
>  	unsigned int spi_freq;
>  	bool wbuf_en;
>  	bool has_irq;
> +	bool high_dma;
>  	struct completion op_done;
>  };
>  
> @@ -305,6 +308,11 @@ static int mtk_nor_dma_exec(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);
> +	}
> +

Maybe use upper_32_bits() ?


>  	if (sp->has_irq) {
>  		reinit_completion(&sp->op_done);
>  		mtk_nor_rmw(sp, MTK_NOR_REG_IRQ_EN, MTK_NOR_IRQ_DMA, 0);
> @@ -635,7 +643,8 @@ 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);
> @@ -647,6 +656,7 @@ static int mtk_nor_probe(struct platform_device *pdev)
>  	void __iomem *base;
>  	struct clk *spi_clk, *ctlr_clk;
>  	int ret, irq;
> +	unsigned long dma_bits;
>  
>  	base = devm_platform_ioremap_resource(pdev, 0);
>  	if (IS_ERR(base))
> @@ -660,6 +670,12 @@ static int mtk_nor_probe(struct platform_device *pdev)
>  	if (IS_ERR(ctlr_clk))
>  		return PTR_ERR(ctlr_clk);
>  
> +	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;
> +	}
> +

As said in previous version. I don't see any place enable high_dma, so I
think this patch won't set >32bits for anychip. We need something like:

	sp->hidh_dma = dma_bits > 32;

Am I missing anything?

Joe.C
Ikjoon Jang Sept. 28, 2020, 2:18 a.m. UTC | #4 
On Sun, Sep 27, 2020 at 4:30 PM Yingjoe Chen <yingjoe.chen@mediatek.com> wrote:
>
> On Fri, 2020-09-25 at 14:54 +0800, Ikjoon Jang wrote:
> > This patch enables 36bit dma address support to spi-mtk-nor.
> > Currently this is enabled only for mt8192-nor.
> >
> > Signed-off-by: Ikjoon Jang <ikjn@chromium.org>
> > ---
> >
> > (no changes since v1)
> >
> >  drivers/spi/spi-mtk-nor.c | 18 +++++++++++++++++-
> >  1 file changed, 17 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/spi/spi-mtk-nor.c b/drivers/spi/spi-mtk-nor.c
> > index 8dbafee7f431..35205635ed42 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
> >
> >  /* maximum bytes of TX in PRG mode */
> >  #define MTK_NOR_PRG_MAX_SIZE         6
> > @@ -106,6 +108,7 @@ struct mtk_nor {
> >       unsigned int spi_freq;
> >       bool wbuf_en;
> >       bool has_irq;
> > +     bool high_dma;
> >       struct completion op_done;
> >  };
> >
> > @@ -305,6 +308,11 @@ static int mtk_nor_dma_exec(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);
> > +     }
> > +
>
> Maybe use upper_32_bits() ?

Thanks, good to know that!

>
>
> >       if (sp->has_irq) {
> >               reinit_completion(&sp->op_done);
> >               mtk_nor_rmw(sp, MTK_NOR_REG_IRQ_EN, MTK_NOR_IRQ_DMA, 0);
> > @@ -635,7 +643,8 @@ 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);
> > @@ -647,6 +656,7 @@ static int mtk_nor_probe(struct platform_device *pdev)
> >       void __iomem *base;
> >       struct clk *spi_clk, *ctlr_clk;
> >       int ret, irq;
> > +     unsigned long dma_bits;
> >
> >       base = devm_platform_ioremap_resource(pdev, 0);
> >       if (IS_ERR(base))
> > @@ -660,6 +670,12 @@ static int mtk_nor_probe(struct platform_device *pdev)
> >       if (IS_ERR(ctlr_clk))
> >               return PTR_ERR(ctlr_clk);
> >
> > +     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;
> > +     }
> > +
>
> As said in previous version. I don't see any place enable high_dma, so I
> think this patch won't set >32bits for anychip. We need something like:
>
>         sp->hidh_dma = dma_bits > 32;
>
> Am I missing anything?

Yeah, you're right, that line disappeared between v2 ~ v3 (by mistake).

>
> Joe.C
>
diff mbox series

Patch

diff --git a/drivers/spi/spi-mtk-nor.c b/drivers/spi/spi-mtk-nor.c
index 8dbafee7f431..35205635ed42 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
 
 /* maximum bytes of TX in PRG mode */
 #define MTK_NOR_PRG_MAX_SIZE		6
@@ -106,6 +108,7 @@  struct mtk_nor {
 	unsigned int spi_freq;
 	bool wbuf_en;
 	bool has_irq;
+	bool high_dma;
 	struct completion op_done;
 };
 
@@ -305,6 +308,11 @@  static int mtk_nor_dma_exec(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);
@@ -635,7 +643,8 @@  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);
@@ -647,6 +656,7 @@  static int mtk_nor_probe(struct platform_device *pdev)
 	void __iomem *base;
 	struct clk *spi_clk, *ctlr_clk;
 	int ret, irq;
+	unsigned long dma_bits;
 
 	base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(base))
@@ -660,6 +670,12 @@  static int mtk_nor_probe(struct platform_device *pdev)
 	if (IS_ERR(ctlr_clk))
 		return PTR_ERR(ctlr_clk);
 
+	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;
+	}
+
 	ctlr = spi_alloc_master(&pdev->dev, sizeof(*sp));
 	if (!ctlr) {
 		dev_err(&pdev->dev, "failed to allocate spi controller\n");