| Message ID | 1410616381-30226-3-git-send-email-wens@csie.org (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
On Sat, Sep 13, 2014 at 09:53:00PM +0800, Chen-Yu Tsai wrote: > The A23 SoC has the same dma engine as the A31 (sun6i), with a > reduced amount of endpoints and physical channels. Add the proper > config data and compatible string to support it. > > A slight difference in sun8i is an undocumented register needs > to be toggled for dma to function. > > Signed-off-by: Chen-Yu Tsai <wens@csie.org> > --- > Documentation/devicetree/bindings/dma/sun6i-dma.txt | 2 +- > drivers/dma/Kconfig | 4 ++-- > drivers/dma/sun6i-dma.c | 20 ++++++++++++++++++++ > 3 files changed, 23 insertions(+), 3 deletions(-) > > diff --git a/Documentation/devicetree/bindings/dma/sun6i-dma.txt b/Documentation/devicetree/bindings/dma/sun6i-dma.txt > index 3e145c1..9cdcba24d 100644 > --- a/Documentation/devicetree/bindings/dma/sun6i-dma.txt > +++ b/Documentation/devicetree/bindings/dma/sun6i-dma.txt > @@ -4,7 +4,7 @@ This driver follows the generic DMA bindings defined in dma.txt. > > Required properties: > > -- compatible: Must be "allwinner,sun6i-a31-dma" > +- compatible: Must be "allwinner,sun6i-a31-dma" or "allwinner,sun8i-a23-dma" > - reg: Should contain the registers base address and length > - interrupts: Should contain a reference to the interrupt used by this device > - clocks: Should contain a reference to the parent AHB clock > diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig > index 9b1ea0e..5361aa7 100644 > --- a/drivers/dma/Kconfig > +++ b/drivers/dma/Kconfig > @@ -395,12 +395,12 @@ config XILINX_VDMA > > config DMA_SUN6I > tristate "Allwinner A31 SoCs DMA support" > - depends on MACH_SUN6I || COMPILE_TEST > + depends on MACH_SUN6I || MACH_SUN8I || COMPILE_TEST > depends on RESET_CONTROLLER > select DMA_ENGINE > select DMA_VIRTUAL_CHANNELS > help > - Support for the DMA engine for Allwinner A31 SoCs. > + Support for the DMA engine first found in Allwinner A31 SoCs. > > config NBPFAXI_DMA > tristate "Renesas Type-AXI NBPF DMA support" > diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c > index 89ca0c4..29667dd 100644 > --- a/drivers/dma/sun6i-dma.c > +++ b/drivers/dma/sun6i-dma.c > @@ -878,8 +878,20 @@ static struct sun6i_dma_config sun6i_a31_dma_cfg = { > .nr_max_vchans = 53, > }; > > +/* > + * The A23 only has 8 physical channels, a maximum DRQ port id of 24, > + * and a total of 37 usable source and destination endpoints. > + */ > + > +static struct sun6i_dma_config sun8i_a23_dma_cfg = { > + .nr_max_channels = 8, > + .nr_max_requests = 24, > + .nr_max_vchans = 37, > +}; > + > static struct of_device_id sun6i_dma_match[] = { > { .compatible = "allwinner,sun6i-a31-dma", .data = &sun6i_a31_dma_cfg }, > + { .compatible = "allwinner,sun8i-a23-dma", .data = &sun8i_a23_dma_cfg }, > { /* sentinel */ } > }; > > @@ -1008,6 +1020,14 @@ static int sun6i_dma_probe(struct platform_device *pdev) > goto err_dma_unregister; > } > > + /* > + * sun8i variant requires us to toggle an undocumented register, > + * as seen in Allwinner's SDK. The BSP I have has this: static void sunxi_dma_hw_init(struct sunxi_dmadev *dev) { struct sunxi_dmadev *sunxi_dev = dev; clk_prepare_enable(sunxi_dev->ahb_clk); #ifdef CONFIG_ARCH_SUN8IW3 writel(0x04, sunxi_dev->base + DMA_GATE); #endif } /* All is ok, and open the clock */ sunxi_dma_hw_init(sunxi_dev); So I guess we can say that it's not that undocumented :) Maxime
On Tue, Sep 16, 2014 at 6:35 PM, Maxime Ripard <maxime.ripard@free-electrons.com> wrote: > On Sat, Sep 13, 2014 at 09:53:00PM +0800, Chen-Yu Tsai wrote: >> The A23 SoC has the same dma engine as the A31 (sun6i), with a >> reduced amount of endpoints and physical channels. Add the proper >> config data and compatible string to support it. >> >> A slight difference in sun8i is an undocumented register needs >> to be toggled for dma to function. >> >> Signed-off-by: Chen-Yu Tsai <wens@csie.org> >> --- >> Documentation/devicetree/bindings/dma/sun6i-dma.txt | 2 +- >> drivers/dma/Kconfig | 4 ++-- >> drivers/dma/sun6i-dma.c | 20 ++++++++++++++++++++ >> 3 files changed, 23 insertions(+), 3 deletions(-) >> >> diff --git a/Documentation/devicetree/bindings/dma/sun6i-dma.txt b/Documentation/devicetree/bindings/dma/sun6i-dma.txt >> index 3e145c1..9cdcba24d 100644 >> --- a/Documentation/devicetree/bindings/dma/sun6i-dma.txt >> +++ b/Documentation/devicetree/bindings/dma/sun6i-dma.txt >> @@ -4,7 +4,7 @@ This driver follows the generic DMA bindings defined in dma.txt. >> >> Required properties: >> >> -- compatible: Must be "allwinner,sun6i-a31-dma" >> +- compatible: Must be "allwinner,sun6i-a31-dma" or "allwinner,sun8i-a23-dma" >> - reg: Should contain the registers base address and length >> - interrupts: Should contain a reference to the interrupt used by this device >> - clocks: Should contain a reference to the parent AHB clock >> diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig >> index 9b1ea0e..5361aa7 100644 >> --- a/drivers/dma/Kconfig >> +++ b/drivers/dma/Kconfig >> @@ -395,12 +395,12 @@ config XILINX_VDMA >> >> config DMA_SUN6I >> tristate "Allwinner A31 SoCs DMA support" >> - depends on MACH_SUN6I || COMPILE_TEST >> + depends on MACH_SUN6I || MACH_SUN8I || COMPILE_TEST >> depends on RESET_CONTROLLER >> select DMA_ENGINE >> select DMA_VIRTUAL_CHANNELS >> help >> - Support for the DMA engine for Allwinner A31 SoCs. >> + Support for the DMA engine first found in Allwinner A31 SoCs. >> >> config NBPFAXI_DMA >> tristate "Renesas Type-AXI NBPF DMA support" >> diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c >> index 89ca0c4..29667dd 100644 >> --- a/drivers/dma/sun6i-dma.c >> +++ b/drivers/dma/sun6i-dma.c >> @@ -878,8 +878,20 @@ static struct sun6i_dma_config sun6i_a31_dma_cfg = { >> .nr_max_vchans = 53, >> }; >> >> +/* >> + * The A23 only has 8 physical channels, a maximum DRQ port id of 24, >> + * and a total of 37 usable source and destination endpoints. >> + */ >> + >> +static struct sun6i_dma_config sun8i_a23_dma_cfg = { >> + .nr_max_channels = 8, >> + .nr_max_requests = 24, >> + .nr_max_vchans = 37, >> +}; >> + >> static struct of_device_id sun6i_dma_match[] = { >> { .compatible = "allwinner,sun6i-a31-dma", .data = &sun6i_a31_dma_cfg }, >> + { .compatible = "allwinner,sun8i-a23-dma", .data = &sun8i_a23_dma_cfg }, >> { /* sentinel */ } >> }; >> >> @@ -1008,6 +1020,14 @@ static int sun6i_dma_probe(struct platform_device *pdev) >> goto err_dma_unregister; >> } >> >> + /* >> + * sun8i variant requires us to toggle an undocumented register, >> + * as seen in Allwinner's SDK. > > The BSP I have has this: > > static void sunxi_dma_hw_init(struct sunxi_dmadev *dev) > { > struct sunxi_dmadev *sunxi_dev = dev; > > clk_prepare_enable(sunxi_dev->ahb_clk); > #ifdef CONFIG_ARCH_SUN8IW3 > writel(0x04, sunxi_dev->base + DMA_GATE); > #endif > } > > /* All is ok, and open the clock */ > sunxi_dma_hw_init(sunxi_dev); > > So I guess we can say that it's not that undocumented :) That's right. I meant undocumented in the user manual. I did reference the SDK in the comment, didn't I? :) ChenYu -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Tue, Sep 16, 2014 at 10:13:27PM +0800, Chen-Yu Tsai wrote: > >> + /* > >> + * sun8i variant requires us to toggle an undocumented register, > >> + * as seen in Allwinner's SDK. > > > > The BSP I have has this: > > > > static void sunxi_dma_hw_init(struct sunxi_dmadev *dev) > > { > > struct sunxi_dmadev *sunxi_dev = dev; > > > > clk_prepare_enable(sunxi_dev->ahb_clk); > > #ifdef CONFIG_ARCH_SUN8IW3 > > writel(0x04, sunxi_dev->base + DMA_GATE); > > #endif > > } > > > > /* All is ok, and open the clock */ > > sunxi_dma_hw_init(sunxi_dev); > > > > So I guess we can say that it's not that undocumented :) > > That's right. I meant undocumented in the user manual. > I did reference the SDK in the comment, didn't I? :) So something like writel(DMA_GATE_ENABLE, base->DMA_GATE_REG) wouldn't be too far off :) Maxime
On Wed, Sep 17, 2014 at 11:55 PM, Maxime Ripard <maxime.ripard@free-electrons.com> wrote: > On Tue, Sep 16, 2014 at 10:13:27PM +0800, Chen-Yu Tsai wrote: >> >> + /* >> >> + * sun8i variant requires us to toggle an undocumented register, >> >> + * as seen in Allwinner's SDK. >> > >> > The BSP I have has this: >> > >> > static void sunxi_dma_hw_init(struct sunxi_dmadev *dev) >> > { >> > struct sunxi_dmadev *sunxi_dev = dev; >> > >> > clk_prepare_enable(sunxi_dev->ahb_clk); >> > #ifdef CONFIG_ARCH_SUN8IW3 >> > writel(0x04, sunxi_dev->base + DMA_GATE); >> > #endif >> > } >> > >> > /* All is ok, and open the clock */ >> > sunxi_dma_hw_init(sunxi_dev); >> > >> > So I guess we can say that it's not that undocumented :) >> >> That's right. I meant undocumented in the user manual. >> I did reference the SDK in the comment, didn't I? :) > > So something like > > writel(DMA_GATE_ENABLE, base->DMA_GATE_REG) wouldn't be too far off :) Sure. Will also update the comment to reflect the naming. ChenYu -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/devicetree/bindings/dma/sun6i-dma.txt b/Documentation/devicetree/bindings/dma/sun6i-dma.txt index 3e145c1..9cdcba24d 100644 --- a/Documentation/devicetree/bindings/dma/sun6i-dma.txt +++ b/Documentation/devicetree/bindings/dma/sun6i-dma.txt @@ -4,7 +4,7 @@ This driver follows the generic DMA bindings defined in dma.txt. Required properties: -- compatible: Must be "allwinner,sun6i-a31-dma" +- compatible: Must be "allwinner,sun6i-a31-dma" or "allwinner,sun8i-a23-dma" - reg: Should contain the registers base address and length - interrupts: Should contain a reference to the interrupt used by this device - clocks: Should contain a reference to the parent AHB clock diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig index 9b1ea0e..5361aa7 100644 --- a/drivers/dma/Kconfig +++ b/drivers/dma/Kconfig @@ -395,12 +395,12 @@ config XILINX_VDMA config DMA_SUN6I tristate "Allwinner A31 SoCs DMA support" - depends on MACH_SUN6I || COMPILE_TEST + depends on MACH_SUN6I || MACH_SUN8I || COMPILE_TEST depends on RESET_CONTROLLER select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help - Support for the DMA engine for Allwinner A31 SoCs. + Support for the DMA engine first found in Allwinner A31 SoCs. config NBPFAXI_DMA tristate "Renesas Type-AXI NBPF DMA support" diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c index 89ca0c4..29667dd 100644 --- a/drivers/dma/sun6i-dma.c +++ b/drivers/dma/sun6i-dma.c @@ -878,8 +878,20 @@ static struct sun6i_dma_config sun6i_a31_dma_cfg = { .nr_max_vchans = 53, }; +/* + * The A23 only has 8 physical channels, a maximum DRQ port id of 24, + * and a total of 37 usable source and destination endpoints. + */ + +static struct sun6i_dma_config sun8i_a23_dma_cfg = { + .nr_max_channels = 8, + .nr_max_requests = 24, + .nr_max_vchans = 37, +}; + static struct of_device_id sun6i_dma_match[] = { { .compatible = "allwinner,sun6i-a31-dma", .data = &sun6i_a31_dma_cfg }, + { .compatible = "allwinner,sun8i-a23-dma", .data = &sun8i_a23_dma_cfg }, { /* sentinel */ } }; @@ -1008,6 +1020,14 @@ static int sun6i_dma_probe(struct platform_device *pdev) goto err_dma_unregister; } + /* + * sun8i variant requires us to toggle an undocumented register, + * as seen in Allwinner's SDK. + */ + if (of_device_is_compatible(pdev->dev.of_node, + "allwinner,sun8i-a23-dma")) + writel(0x4, sdc->base + 0x20); + return 0; err_dma_unregister:
The A23 SoC has the same dma engine as the A31 (sun6i), with a reduced amount of endpoints and physical channels. Add the proper config data and compatible string to support it. A slight difference in sun8i is an undocumented register needs to be toggled for dma to function. Signed-off-by: Chen-Yu Tsai <wens@csie.org> --- Documentation/devicetree/bindings/dma/sun6i-dma.txt | 2 +- drivers/dma/Kconfig | 4 ++-- drivers/dma/sun6i-dma.c | 20 ++++++++++++++++++++ 3 files changed, 23 insertions(+), 3 deletions(-)