[PATCH 26/63] dmaengine: ste_dma40: Supply full Device Tree parsing support

[PATCH 26/63] dmaengine: ste_dma40: Supply full Device Tree parsing support

[Lee Jones]

Using the new DMA DT bindings and API, we can register the DMA40 driver
as Device Tree capable. Now, when a client attempts to allocate a
channel using the DMA DT bindings via its own node, we are able to parse
the request and allocate a channel in the correct manner.

Cc: Vinod Koul <vinod.koul-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: Dan Williams <djbw-b10kYP2dOMg@public.gmane.org>
Cc: Per Forlin <per.forlin-0IS4wlFg1OjSUeElwK9/Pw@public.gmane.org>
Cc: Rabin Vincent <rabin-66gdRtMMWGc@public.gmane.org>
Cc: Rob Herring <rob.herring-bsGFqQB8/DxBDgjK7y7TUQ@public.gmane.org>
Cc: devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org
Reviewed-by: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
Signed-off-by: Lee Jones <lee.jones-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
---
 .../devicetree/bindings/dma/ste-dma40.txt          |   62 ++++++++++++++++++++
 drivers/dma/ste_dma40.c                            |   52 ++++++++++++++++
 2 files changed, 114 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma/ste-dma40.txt

diff --git a/Documentation/devicetree/bindings/dma/ste-dma40.txt b/Documentation/devicetree/bindings/dma/ste-dma40.txt
new file mode 100644
index 0000000..2679a87
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/ste-dma40.txt
@@ -0,0 +1,62 @@
+* DMA40 DMA Controller
+
+Required properties:
+- compatible: "stericsson,dma40"
+- reg: Address range of the DMAC registers
+- reg-names: Names of the above areas to use during resource look-up
+- interrupt: Should contain the DMAC interrupt number
+- #dma-cells: must be <3>
+
+Optional properties:
+- dma-channels: Number of channels supported by hardware - if not present
+		the driver will attempt to obtain the information from H/W
+
+Example:
+
+	dma: dma-controller@801C0000 {
+		compatible = "stericsson,db8500-dma40", "stericsson,dma40";
+		reg = <0x801C0000 0x1000  0x40010000 0x800>;
+		reg-names = "base", "lcpa";
+		interrupt-parent = <&intc>;
+		interrupts = <0 25 0x4>;
+
+		#dma-cells = <2>;
+		dma-channels = <8>;
+	};
+
+Clients
+Required properties:
+- dmas: Comma separated list of dma channel requests
+- dma-names: Names of the aforementioned requested channels
+
+Each dmas request consists of 4 cells:
+  1. A phandle pointing to the DMA controller
+  2. Device Type
+  3. The DMA request line number (only when 'use fixed channel' is set)
+  4. A 32bit mask specifying; mode, direction and endianess [NB: This list will grow]
+        0x00000001: Mode:
+                Logical channel when unset
+                Physical channel when set
+        0x00000002: Direction:
+                Memory to Device when unset
+                Device to Memory when set
+        0x00000004: Endianess:
+                Little endian when unset
+                Big endian when set
+        0x00000008: Use fixed channel:
+                Use automatic channel selection when unset
+                Use DMA request line number when set
+
+Example:
+
+	uart@80120000 {
+		compatible = "arm,pl011", "arm,primecell";
+		reg = <0x80120000 0x1000>;
+		interrupts = <0 11 0x4>;
+
+		dmas = <&dma 13 0 0x2>, /* Logical - DevToMem */
+		       <&dma 13 0 0x0>; /* Logical - MemToDev */
+		dma-names = "rx", "rx";
+
+		status = "disabled";
+	};
diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index d7c2397..b77d508 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -18,6 +18,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/err.h>
 #include <linux/of.h>
+#include <linux/of_dma.h>
 #include <linux/amba/bus.h>
 #include <linux/regulator/consumer.h>
 #include <linux/platform_data/dma-ste-dma40.h>
@@ -2419,6 +2420,50 @@ static void d40_set_prio_realtime(struct d40_chan *d40c)
 		__d40_set_prio_rt(d40c, d40c->dma_cfg.dev_type, false);
 }
 
+#define D40_DT_FLAGS_MODE(flags)       ((flags >> 0) & 0x1)
+#define D40_DT_FLAGS_DIR(flags)        ((flags >> 1) & 0x1)
+#define D40_DT_FLAGS_BIG_ENDIAN(flags) ((flags >> 2) & 0x1)
+#define D40_DT_FLAGS_FIXED_CHAN(flags) ((flags >> 3) & 0x1)
+
+static struct dma_chan *d40_xlate(struct of_phandle_args *dma_spec,
+				  struct of_dma *ofdma)
+{
+	struct stedma40_chan_cfg cfg;
+	dma_cap_mask_t cap;
+	u32 flags;
+
+	memset(&cfg, 0, sizeof(struct stedma40_chan_cfg));
+
+	dma_cap_zero(cap);
+	dma_cap_set(DMA_SLAVE, cap);
+
+	cfg.dev_type = dma_spec->args[0];
+	flags = dma_spec->args[2];
+
+	switch (D40_DT_FLAGS_MODE(flags)) {
+	case 0: cfg.mode = STEDMA40_MODE_LOGICAL; break;
+	case 1: cfg.mode = STEDMA40_MODE_PHYSICAL; break;
+	}
+
+	switch (D40_DT_FLAGS_DIR(flags)) {
+	case 0:
+		cfg.dir = STEDMA40_MEM_TO_PERIPH;
+		cfg.dst_info.big_endian = D40_DT_FLAGS_BIG_ENDIAN(flags);
+		break;
+	case 1:
+		cfg.dir = STEDMA40_PERIPH_TO_MEM;
+		cfg.src_info.big_endian = D40_DT_FLAGS_BIG_ENDIAN(flags);
+		break;
+	}
+
+	if (D40_DT_FLAGS_FIXED_CHAN(flags)) {
+		cfg.phy_channel = dma_spec->args[1];
+		cfg.use_fixed_channel = true;
+	}
+
+	return dma_request_channel(cap, stedma40_filter, &cfg);
+}
+
 /* DMA ENGINE functions */
 static int d40_alloc_chan_resources(struct dma_chan *chan)
 {
@@ -3632,6 +3677,13 @@ static int __init d40_probe(struct platform_device *pdev)
 
 	d40_hw_init(base);
 
+	if (np) {
+		err = of_dma_controller_register(np, d40_xlate, NULL);
+		if (err && err != -ENODEV)
+			dev_err(&pdev->dev,
+				"could not register of_dma_controller\n");
+	}
+
 	dev_info(base->dev, "initialized\n");
 	return 0;
 
-- 
1.7.10.4

Re: [PATCH 26/63] dmaengine: ste_dma40: Supply full Device Tree parsing support

[Linus Walleij]

On Fri, May 3, 2013 at 4:32 PM, Lee Jones <lee.jones@linaro.org> wrote:

> Using the new DMA DT bindings and API, we can register the DMA40 driver
> as Device Tree capable. Now, when a client attempts to allocate a
> channel using the DMA DT bindings via its own node, we are able to parse
> the request and allocate a channel in the correct manner.
>
> Cc: Vinod Koul <vinod.koul@intel.com>
> Cc: Dan Williams <djbw@fb.com>
> Cc: Per Forlin <per.forlin@stericsson.com>
> Cc: Rabin Vincent <rabin@rab.in>
> Cc: Rob Herring <rob.herring@calxeda.com>
> Cc: devicetree-discuss@lists.ozlabs.org
> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
> Signed-off-by: Lee Jones <lee.jones@linaro.org>

Applied to my ux500-dma40 branch.

Thanks!
Linus Walleij

Re: [PATCH 26/63] dmaengine: ste_dma40: Supply full Device Tree parsing support

[Linus Walleij]

On Fri, May 3, 2013 at 10:59 PM, Linus Walleij <linus.walleij@linaro.org> wrote:
> On Fri, May 3, 2013 at 4:32 PM, Lee Jones <lee.jones@linaro.org> wrote:
>
>> Using the new DMA DT bindings and API, we can register the DMA40 driver
>> as Device Tree capable. Now, when a client attempts to allocate a
>> channel using the DMA DT bindings via its own node, we are able to parse
>> the request and allocate a channel in the correct manner.
>>
>> Cc: Vinod Koul <vinod.koul@intel.com>
>> Cc: Dan Williams <djbw@fb.com>
>> Cc: Per Forlin <per.forlin@stericsson.com>
>> Cc: Rabin Vincent <rabin@rab.in>
>> Cc: Rob Herring <rob.herring@calxeda.com>
>> Cc: devicetree-discuss@lists.ozlabs.org
>> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
>> Signed-off-by: Lee Jones <lee.jones@linaro.org>
>
> Applied to my ux500-dma40 branch.

But hmmm would be really nice to have Vinod's ACK on this
patch as well.

Yours,
Linus Walleij

Re: [PATCH 26/63] dmaengine: ste_dma40: Supply full Device Tree parsing support

[Vinod Koul]

On Fri, May 03, 2013 at 03:32:12PM +0100, Lee Jones wrote:
> Using the new DMA DT bindings and API, we can register the DMA40 driver
> as Device Tree capable. Now, when a client attempts to allocate a
> channel using the DMA DT bindings via its own node, we are able to parse
> the request and allocate a channel in the correct manner.
> 
> Cc: Vinod Koul <vinod.koul@intel.com>
> Cc: Dan Williams <djbw@fb.com>
> Cc: Per Forlin <per.forlin@stericsson.com>
> Cc: Rabin Vincent <rabin@rab.in>
> Cc: Rob Herring <rob.herring@calxeda.com>
> Cc: devicetree-discuss@lists.ozlabs.org
> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
> Signed-off-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Vinod Koul <vinod.koul@intel.com>

--
~Vinod
> ---
>  .../devicetree/bindings/dma/ste-dma40.txt          |   62 ++++++++++++++++++++
>  drivers/dma/ste_dma40.c                            |   52 ++++++++++++++++
>  2 files changed, 114 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/dma/ste-dma40.txt
> 
> diff --git a/Documentation/devicetree/bindings/dma/ste-dma40.txt b/Documentation/devicetree/bindings/dma/ste-dma40.txt
> new file mode 100644
> index 0000000..2679a87
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/ste-dma40.txt
> @@ -0,0 +1,62 @@
> +* DMA40 DMA Controller
> +
> +Required properties:
> +- compatible: "stericsson,dma40"
> +- reg: Address range of the DMAC registers
> +- reg-names: Names of the above areas to use during resource look-up
> +- interrupt: Should contain the DMAC interrupt number
> +- #dma-cells: must be <3>
> +
> +Optional properties:
> +- dma-channels: Number of channels supported by hardware - if not present
> +		the driver will attempt to obtain the information from H/W
> +
> +Example:
> +
> +	dma: dma-controller@801C0000 {
> +		compatible = "stericsson,db8500-dma40", "stericsson,dma40";
> +		reg = <0x801C0000 0x1000  0x40010000 0x800>;
> +		reg-names = "base", "lcpa";
> +		interrupt-parent = <&intc>;
> +		interrupts = <0 25 0x4>;
> +
> +		#dma-cells = <2>;
> +		dma-channels = <8>;
> +	};
> +
> +Clients
> +Required properties:
> +- dmas: Comma separated list of dma channel requests
> +- dma-names: Names of the aforementioned requested channels
> +
> +Each dmas request consists of 4 cells:
> +  1. A phandle pointing to the DMA controller
> +  2. Device Type
> +  3. The DMA request line number (only when 'use fixed channel' is set)
> +  4. A 32bit mask specifying; mode, direction and endianess [NB: This list will grow]
> +        0x00000001: Mode:
> +                Logical channel when unset
> +                Physical channel when set
> +        0x00000002: Direction:
> +                Memory to Device when unset
> +                Device to Memory when set
> +        0x00000004: Endianess:
> +                Little endian when unset
> +                Big endian when set
> +        0x00000008: Use fixed channel:
> +                Use automatic channel selection when unset
> +                Use DMA request line number when set
> +
> +Example:
> +
> +	uart@80120000 {
> +		compatible = "arm,pl011", "arm,primecell";
> +		reg = <0x80120000 0x1000>;
> +		interrupts = <0 11 0x4>;
> +
> +		dmas = <&dma 13 0 0x2>, /* Logical - DevToMem */
> +		       <&dma 13 0 0x0>; /* Logical - MemToDev */
> +		dma-names = "rx", "rx";
> +
> +		status = "disabled";
> +	};
> diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
> index d7c2397..b77d508 100644
> --- a/drivers/dma/ste_dma40.c
> +++ b/drivers/dma/ste_dma40.c
> @@ -18,6 +18,7 @@
>  #include <linux/pm_runtime.h>
>  #include <linux/err.h>
>  #include <linux/of.h>
> +#include <linux/of_dma.h>
>  #include <linux/amba/bus.h>
>  #include <linux/regulator/consumer.h>
>  #include <linux/platform_data/dma-ste-dma40.h>
> @@ -2419,6 +2420,50 @@ static void d40_set_prio_realtime(struct d40_chan *d40c)
>  		__d40_set_prio_rt(d40c, d40c->dma_cfg.dev_type, false);
>  }
>  
> +#define D40_DT_FLAGS_MODE(flags)       ((flags >> 0) & 0x1)
> +#define D40_DT_FLAGS_DIR(flags)        ((flags >> 1) & 0x1)
> +#define D40_DT_FLAGS_BIG_ENDIAN(flags) ((flags >> 2) & 0x1)
> +#define D40_DT_FLAGS_FIXED_CHAN(flags) ((flags >> 3) & 0x1)
> +
> +static struct dma_chan *d40_xlate(struct of_phandle_args *dma_spec,
> +				  struct of_dma *ofdma)
> +{
> +	struct stedma40_chan_cfg cfg;
> +	dma_cap_mask_t cap;
> +	u32 flags;
> +
> +	memset(&cfg, 0, sizeof(struct stedma40_chan_cfg));
> +
> +	dma_cap_zero(cap);
> +	dma_cap_set(DMA_SLAVE, cap);
> +
> +	cfg.dev_type = dma_spec->args[0];
> +	flags = dma_spec->args[2];
> +
> +	switch (D40_DT_FLAGS_MODE(flags)) {
> +	case 0: cfg.mode = STEDMA40_MODE_LOGICAL; break;
> +	case 1: cfg.mode = STEDMA40_MODE_PHYSICAL; break;
> +	}
> +
> +	switch (D40_DT_FLAGS_DIR(flags)) {
> +	case 0:
> +		cfg.dir = STEDMA40_MEM_TO_PERIPH;
> +		cfg.dst_info.big_endian = D40_DT_FLAGS_BIG_ENDIAN(flags);
> +		break;
> +	case 1:
> +		cfg.dir = STEDMA40_PERIPH_TO_MEM;
> +		cfg.src_info.big_endian = D40_DT_FLAGS_BIG_ENDIAN(flags);
> +		break;
> +	}
> +
> +	if (D40_DT_FLAGS_FIXED_CHAN(flags)) {
> +		cfg.phy_channel = dma_spec->args[1];
> +		cfg.use_fixed_channel = true;
> +	}
> +
> +	return dma_request_channel(cap, stedma40_filter, &cfg);
> +}
> +
>  /* DMA ENGINE functions */
>  static int d40_alloc_chan_resources(struct dma_chan *chan)
>  {
> @@ -3632,6 +3677,13 @@ static int __init d40_probe(struct platform_device *pdev)
>  
>  	d40_hw_init(base);
>  
> +	if (np) {
> +		err = of_dma_controller_register(np, d40_xlate, NULL);
> +		if (err && err != -ENODEV)
> +			dev_err(&pdev->dev,
> +				"could not register of_dma_controller\n");
> +	}
> +
>  	dev_info(base->dev, "initialized\n");
>  	return 0;
>  
> -- 
> 1.7.10.4
> 

[PATCH 49/63] usb: musb: ux500: add device tree probing support

[Lee Jones]

This patch will allow ux500-musb to be probed and configured solely from
configuration found in Device Tree.

Cc: Felipe Balbi <balbi-l0cyMroinI0@public.gmane.org>
Cc: Rob Herring <rob.herring-bsGFqQB8/DxBDgjK7y7TUQ@public.gmane.org>
Cc: linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org
Acked-by: Linus Walleij <linus.walleij-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Acked-by: Fabio Baltieri <fabio.baltieri-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Signed-off-by: Lee Jones <lee.jones-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
---
 .../devicetree/bindings/usb/ux500-usb.txt          |   50 +++++++++++++++++++
 drivers/usb/musb/ux500.c                           |   51 ++++++++++++++++++++
 2 files changed, 101 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/ux500-usb.txt

diff --git a/Documentation/devicetree/bindings/usb/ux500-usb.txt b/Documentation/devicetree/bindings/usb/ux500-usb.txt
new file mode 100644
index 0000000..330d6ec
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/ux500-usb.txt
@@ -0,0 +1,50 @@
+Ux500 MUSB
+
+Required properties:
+ - compatible : Should be "stericsson,db8500-musb"
+ - reg        : Offset and length of registers
+ - interrupts : Interrupt; mode, number and trigger
+ - dr_mode    : Dual-role; either host mode "host", peripheral mode "peripheral"
+                or both "otg"
+
+Optional properties:
+ - dmas       : A list of dma channels;
+                dma-controller, event-line, fixed-channel, flags
+ - dma-names  : An ordered list of channel names affiliated to the above
+
+Example:
+
+usb_per5@a03e0000 {
+	compatible = "stericsson,db8500-musb", "mentor,musb";
+	reg = <0xa03e0000 0x10000>;
+	interrupts = <0 23 0x4>;
+	interrupt-names = "mc";
+
+	dr_mode = "otg";
+
+	dmas = <&dma 38 0 0x2>, /* Logical - DevToMem */
+	       <&dma 38 0 0x0>, /* Logical - MemToDev */
+	       <&dma 37 0 0x2>, /* Logical - DevToMem */
+	       <&dma 37 0 0x0>, /* Logical - MemToDev */
+	       <&dma 36 0 0x2>, /* Logical - DevToMem */
+	       <&dma 36 0 0x0>, /* Logical - MemToDev */
+	       <&dma 19 0 0x2>, /* Logical - DevToMem */
+	       <&dma 19 0 0x0>, /* Logical - MemToDev */
+	       <&dma 18 0 0x2>, /* Logical - DevToMem */
+	       <&dma 18 0 0x0>, /* Logical - MemToDev */
+	       <&dma 17 0 0x2>, /* Logical - DevToMem */
+	       <&dma 17 0 0x0>, /* Logical - MemToDev */
+	       <&dma 16 0 0x2>, /* Logical - DevToMem */
+	       <&dma 16 0 0x0>, /* Logical - MemToDev */
+	       <&dma 39 0 0x2>, /* Logical - DevToMem */
+	       <&dma 39 0 0x0>; /* Logical - MemToDev */
+
+	dma-names = "iep_1_9",  "oep_1_9",
+		    "iep_2_10", "oep_2_10",
+		    "iep_3_11", "oep_3_11",
+		    "iep_4_12", "oep_4_12",
+		    "iep_5_13", "oep_5_13",
+		    "iep_6_14", "oep_6_14",
+		    "iep_7_15", "oep_7_15",
+		    "iep_8",    "oep_8";
+};
diff --git a/drivers/usb/musb/ux500.c b/drivers/usb/musb/ux500.c
index 7ddb132..5ff304c 100644
--- a/drivers/usb/musb/ux500.c
+++ b/drivers/usb/musb/ux500.c
@@ -25,6 +25,7 @@
 #include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/io.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 
 #include "musb_core.h"
@@ -88,14 +89,57 @@ static const struct musb_platform_ops ux500_ops = {
 	.exit		= ux500_musb_exit,
 };
 
+static struct musb_hdrc_platform_data *
+ux500_of_probe(struct platform_device *pdev, struct device_node *np)
+{
+	struct musb_hdrc_platform_data *pdata;
+	const char *mode;
+	int strlen;
+
+	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return NULL;
+
+	mode = of_get_property(np, "dr_mode", &strlen);
+	if (!mode) {
+		dev_err(&pdev->dev, "No 'dr_mode' property found\n");
+		return NULL;
+	}
+
+	if (strlen > 0) {
+		if (!strcmp(mode, "host"))
+			pdata->mode = MUSB_HOST;
+		if (!strcmp(mode, "otg"))
+			pdata->mode = MUSB_OTG;
+		if (!strcmp(mode, "peripheral"))
+			pdata->mode = MUSB_PERIPHERAL;
+	}
+
+	return pdata;
+}
+
 static int ux500_probe(struct platform_device *pdev)
 {
 	struct musb_hdrc_platform_data	*pdata = pdev->dev.platform_data;
+	struct device_node		*np = pdev->dev.of_node;
 	struct platform_device		*musb;
 	struct ux500_glue		*glue;
 	struct clk			*clk;
 	int				ret = -ENOMEM;
 
+	if (!pdata) {
+		if (np) {
+			pdata = ux500_of_probe(pdev, np);
+			if (!pdata)
+				goto err0;
+
+			pdev->dev.platform_data = pdata;
+		} else {
+			dev_err(&pdev->dev, "no pdata or device tree found\n");
+			goto err0;
+		}
+	}
+
 	glue = kzalloc(sizeof(*glue), GFP_KERNEL);
 	if (!glue) {
 		dev_err(&pdev->dev, "failed to allocate glue context\n");
@@ -124,6 +168,7 @@ static int ux500_probe(struct platform_device *pdev)
 	musb->dev.parent		= &pdev->dev;
 	musb->dev.dma_mask		= &pdev->dev.coherent_dma_mask;
 	musb->dev.coherent_dma_mask	= pdev->dev.coherent_dma_mask;
+	musb->dev.of_node		= pdev->dev.of_node;
 
 	glue->dev			= &pdev->dev;
 	glue->musb			= musb;
@@ -222,12 +267,18 @@ static const struct dev_pm_ops ux500_pm_ops = {
 #define DEV_PM_OPS	NULL
 #endif
 
+static const struct of_device_id ux500_match[] = {
+        { .compatible = "stericsson,db8500-musb", },
+        {}
+};
+
 static struct platform_driver ux500_driver = {
 	.probe		= ux500_probe,
 	.remove		= ux500_remove,
 	.driver		= {
 		.name	= "musb-ux500",
 		.pm	= DEV_PM_OPS,
+		.of_match_table = ux500_match,
 	},
 };
 
-- 
1.7.10.4