[PATCH 0/3] Add ST dwc3 glue layer driver.

[PATCH 0/3] Add ST dwc3 glue layer driver.

[Peter Griffin]

This series adds support for the ST glue logic to manage the DWC3 HC
on STiH407 SoC family chipsets.

Peter Griffin (3):
  usb: dwc3: add ST dwc3 glue layer to manage dwc3 HC
  ARM: dts: sti: Add st-dwc3 devicetree bindings documentation
  MAINTAINERS: Add dwc3-st.c file to ARCH/STI architecture

 Documentation/devicetree/bindings/usb/dwc3-st.txt |  58 ++++
 MAINTAINERS                                       |   1 +
 drivers/usb/dwc3/Kconfig                          |   9 +
 drivers/usb/dwc3/Makefile                         |   1 +
 drivers/usb/dwc3/dwc3-st.c                        | 325 ++++++++++++++++++++++
 5 files changed, 394 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/dwc3-st.txt
 create mode 100644 drivers/usb/dwc3/dwc3-st.c

-- 
1.9.1

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[PATCH 1/3] usb: dwc3: add ST dwc3 glue layer to manage dwc3 HC

[Peter Griffin]

This patch adds the ST glue logic to manage the DWC3 HC
on STiH407 SoC family. It manages the powerdown signal,
and configures the internal glue logic and syscfg registers.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
---
 drivers/usb/dwc3/Kconfig   |   9 ++
 drivers/usb/dwc3/Makefile  |   1 +
 drivers/usb/dwc3/dwc3-st.c | 325 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 335 insertions(+)
 create mode 100644 drivers/usb/dwc3/dwc3-st.c

diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
index 8eb996e..f7b0518 100644
--- a/drivers/usb/dwc3/Kconfig
+++ b/drivers/usb/dwc3/Kconfig
@@ -77,6 +77,15 @@ config USB_DWC3_KEYSTONE
 	default USB_DWC3
 	help
 	  Support of USB2/3 functionality in TI Keystone2 platforms.
+
+config USB_DWC3_ST
+	tristate "STMicroelectronics Platforms"
+	depends on ARCH_STI && OF
+	default USB_DWC3_HOST
+	help
+	  STMicroelectronics SoCs chip with one DesignWare Core USB3 IP
+	  inside (i.e. STiH407).
+
 	  Say 'Y' or 'M' here if you have one such device
 
 comment "Debugging features"
diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile
index 10ac3e7..11c9f54 100644
--- a/drivers/usb/dwc3/Makefile
+++ b/drivers/usb/dwc3/Makefile
@@ -33,3 +33,4 @@ obj-$(CONFIG_USB_DWC3_OMAP)		+= dwc3-omap.o
 obj-$(CONFIG_USB_DWC3_EXYNOS)		+= dwc3-exynos.o
 obj-$(CONFIG_USB_DWC3_PCI)		+= dwc3-pci.o
 obj-$(CONFIG_USB_DWC3_KEYSTONE)		+= dwc3-keystone.o
+obj-$(CONFIG_USB_DWC3_ST)		+= dwc3-st.o
diff --git a/drivers/usb/dwc3/dwc3-st.c b/drivers/usb/dwc3/dwc3-st.c
new file mode 100644
index 0000000..80b1b8f
--- /dev/null
+++ b/drivers/usb/dwc3/dwc3-st.c
@@ -0,0 +1,325 @@
+/**
+ * dwc3-st.c Support for dwc3 platform devices on ST Microelectronics platforms
+ *
+ * This is a small platform driver for the dwc3 to provide the glue logic
+ * to configure the controller. Tested on STi platforms.
+ *
+ * Copyright (C) 2014 Stmicroelectronics
+ *
+ * Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
+ * Contributors: Aymen Bouattay <aymen.bouattay@st.com>
+ *               Peter Griffin <peter.griffin@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Inspired by dwc3-omap.c and dwc3-exynos.c.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/mfd/syscon.h>
+#include <linux/delay.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+
+#include "core.h"
+#include "io.h"
+
+/* Reg glue registers */
+#define USB2_CLKRST_CTRL 0x00
+#define aux_clk_en(n) ((n)<<0)
+#define sw_pipew_reset_n(n) ((n)<<4)
+#define ext_cfg_reset_n(n) ((n)<<8)
+#define xhci_revision(n) ((n)<<12)
+
+#define USB2_VBUS_MNGMNT_SEL1 0x2C
+/*
+ * 2'b00 : Override value from Reg 0x30 is selected
+ * 2'b01 : utmiotg_vbusvalid from usb3_top top is selected
+ * 2'b10 : pipew_powerpresent from PIPEW instance is selected
+ * 2'b11 : value is 1'b0
+ */
+#define SEL_OVERRIDE_VBUSVALID(n) ((n)<<0)
+#define SEL_OVERRIDE_POWERPRESENT(n) ((n)<<4)
+#define SEL_OVERRIDE_BVALID(n) ((n)<<8)
+
+#define USB2_VBUS_MNGMNT_VAL1 0x30
+#define OVERRIDE_VBUSVALID_VAL (1 << 0)
+#define OVERRIDE_POWERPRESENT_VAL (1 << 4)
+#define OVERRIDE_BVALID_VAL (1 << 8)
+
+/* Static DRD configuration */
+#define USB_HOST_DEFAULT_MASK	0xffe
+#define USB_SET_PORT_DEVICE	0x1
+
+struct st_dwc3 {
+	struct platform_device *dwc3;	/* platform device pointer */
+	struct device *dev;	/* device pointer */
+	void __iomem *glue_base;	/* ioaddr for programming the glue */
+	struct regmap *regmap;	/* regmap for getting syscfg */
+	int syscfg_reg_off;	/* usb syscfg control offset */
+	bool drd_device_conf;	/* DRD static host/device conf */
+	struct reset_control *rstc_pwrdn;/* Rst control for powerdown*/
+};
+
+static inline u32 st_dwc3_readl(void __iomem *base, u32 offset)
+{
+	return readl_relaxed(base + offset);
+}
+
+static inline void st_dwc3_writel(void __iomem *base, u32 offset, u32 value)
+{
+	writel_relaxed(value, base + offset);
+}
+
+/**
+ * st_dwc3_drd_init: program the port
+ * @dwc3_data: driver private structure
+ * Description: this function is to program the port as either host or device
+ * according to the static configuration passed from devicetree.
+ * OTG and dual role are not yet supported!
+ */
+static int st_dwc3_drd_init(struct st_dwc3 *dwc3_data)
+{
+	u32 val;
+
+	regmap_read(dwc3_data->regmap, dwc3_data->syscfg_reg_off, &val);
+
+	if (dwc3_data->drd_device_conf)
+		val |= USB_SET_PORT_DEVICE;
+	else
+		val &= USB_HOST_DEFAULT_MASK;
+
+	return regmap_write(dwc3_data->regmap, dwc3_data->syscfg_reg_off, val);
+}
+
+/**
+ * st_dwc3_init: init the controller via glue logic
+ * @dwc3_data: driver private structure
+ */
+static void st_dwc3_init(struct st_dwc3 *dwc3_data)
+{
+	u32 reg = st_dwc3_readl(dwc3_data->glue_base, USB2_CLKRST_CTRL);
+
+	reg |= aux_clk_en(1) | ext_cfg_reset_n(1) | xhci_revision(1);
+	reg &= ~sw_pipew_reset_n(1);
+	st_dwc3_writel(dwc3_data->glue_base, USB2_CLKRST_CTRL, reg);
+
+	reg = st_dwc3_readl(dwc3_data->glue_base, USB2_VBUS_MNGMNT_SEL1);
+	reg |= SEL_OVERRIDE_VBUSVALID(1) | SEL_OVERRIDE_POWERPRESENT(1) |
+	    SEL_OVERRIDE_BVALID(1);
+	st_dwc3_writel(dwc3_data->glue_base, USB2_VBUS_MNGMNT_SEL1, reg);
+	udelay(100);
+
+	reg = st_dwc3_readl(dwc3_data->glue_base, USB2_CLKRST_CTRL);
+	reg |= sw_pipew_reset_n(1);
+	st_dwc3_writel(dwc3_data->glue_base, USB2_CLKRST_CTRL, reg);
+}
+
+static void st_dwc3_dt_get_pdata(struct platform_device *pdev,
+				 struct st_dwc3 *dwc3_data)
+{
+	struct device_node *np = pdev->dev.of_node;
+
+	dwc3_data->drd_device_conf =
+	    of_property_read_bool(np, "st,dwc3-drd-device");
+}
+
+/**
+ * st_dwc3_probe: main probe function
+ * @pdev: platform_device
+ * Description: this is the probe function that gets all the resources to manage
+ * the glue-logic, setup the controller and take out of powerdown.
+ */
+static int st_dwc3_probe(struct platform_device *pdev)
+{
+	struct platform_device *dwc3;
+	struct st_dwc3 *dwc3_data;
+	struct resource *res;
+	struct device *dev = &pdev->dev;
+	struct device_node *node = dev->of_node;
+	struct regmap *regmap;
+	int ret = 0;
+
+	if (!node) {
+		dev_err(dev, "device node not found\n");
+		return -EINVAL;
+	}
+
+	dwc3_data = devm_kzalloc(dev, sizeof(*dwc3_data), GFP_KERNEL);
+	if (!dwc3_data)
+		return -ENOMEM;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "reg-glue");
+	if (!res)
+		return -ENXIO;
+
+	dwc3_data->glue_base = devm_request_and_ioremap(dev, res);
+	if (!dwc3_data->glue_base)
+		return -EADDRNOTAVAIL;
+
+	regmap = syscon_regmap_lookup_by_phandle(node, "st,syscfg");
+	if (IS_ERR(regmap))
+		return PTR_ERR(regmap);
+
+	dwc3 = platform_device_alloc("st-dwc3", PLATFORM_DEVID_AUTO);
+	if (!dwc3) {
+		dev_err(&pdev->dev, "couldn't allocate dwc3 device\n");
+		return -ENOMEM;
+	}
+
+	dma_set_coherent_mask(&dwc3->dev, dev->coherent_dma_mask);
+
+	dwc3->dev.parent = &pdev->dev;
+	dwc3->dev.dma_mask = pdev->dev.dma_mask;
+	dwc3->dev.dma_parms = pdev->dev.dma_parms;
+
+	dwc3_data->dwc3 = dwc3;
+	dwc3_data->dev = &pdev->dev;
+	dwc3_data->regmap = regmap;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "syscfg-reg");
+	if (!res) {
+		ret = -ENXIO;
+		goto undo_platform_dev_alloc;
+	}
+
+	dwc3_data->syscfg_reg_off = res->start;
+
+	dev_info(&pdev->dev, "glue-logic addr 0x%p, syscfg-reg offset 0x%x\n",
+		 dwc3_data->glue_base, dwc3_data->syscfg_reg_off);
+
+	dwc3_data->rstc_pwrdn = devm_reset_control_get(dwc3_data->dev, NULL);
+	if (IS_ERR(dwc3_data->rstc_pwrdn)) {
+		dev_err(&pdev->dev, "could not get reset controller\n");
+		ret = PTR_ERR(dwc3_data->rstc_pwrdn);
+		goto undo_platform_dev_alloc;
+	}
+
+	/* Manage PowerDown */
+	reset_control_deassert(dwc3_data->rstc_pwrdn);
+
+	st_dwc3_dt_get_pdata(pdev, dwc3_data);
+
+	/* Allocate and initialize the core */
+	ret = of_platform_populate(node, NULL, NULL, dev);
+	if (ret) {
+		dev_err(dev, "failed to add dwc3 core\n");
+		goto undo_powerdown;
+	}
+
+	/* 
+	 * Configure the USB port as device or host according to the static
+	 * configuration passed from the platform.
+	 * DRD is the only mode currently supported so this will be enhanced
+	 * later as soon as OTG will be available.
+	 */
+	ret = st_dwc3_drd_init(dwc3_data);
+	if (ret) {
+		dev_err(dev, "st_dwc3_drd_init failed\n");
+		goto undo_powerdown;
+	}
+
+	dev_info(&pdev->dev, "configured as %s DRD\n",
+		 dwc3_data->drd_device_conf ? "device" : "host");
+
+	/* ST glue logic init */
+	st_dwc3_init(dwc3_data);
+
+	ret = platform_device_add_resources(dwc3_data->dwc3, pdev->resource,
+					    pdev->num_resources);
+	if (ret) {
+		dev_err(&pdev->dev, "couldn't add resources to dwc3 device\n");
+		goto undo_powerdown;
+	}
+
+	ret = platform_device_add(dwc3_data->dwc3);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register dwc3 device\n");
+		goto undo_powerdown;
+	}
+
+	platform_set_drvdata(pdev, dwc3_data);
+
+	return 0;
+
+undo_powerdown:
+	reset_control_assert(dwc3_data->rstc_pwrdn);
+undo_platform_dev_alloc:
+	platform_device_put(pdev);
+
+	return ret;
+
+}
+
+static int st_dwc3_remove(struct platform_device *pdev)
+{
+	struct st_dwc3 *dwc3_data = platform_get_drvdata(pdev);
+
+	platform_device_unregister(dwc3_data->dwc3);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int st_dwc3_suspend(struct device *dev)
+{
+	struct st_dwc3 *dwc3_data = dev_get_drvdata(dev);
+
+	reset_control_assert(dwc3_data->rstc_pwrdn);
+
+	pinctrl_pm_select_sleep_state(dev);
+
+	return 0;
+}
+
+static int st_dwc3_resume(struct device *dev)
+{
+	struct st_dwc3 *dwc3_data = dev_get_drvdata(dev);
+
+	pinctrl_pm_select_default_state(dev);
+
+	reset_control_deassert(dwc3_data->rstc_pwrdn);
+
+	return 0;
+}
+
+#endif /* CONFIG_PM_SLEEP */
+
+static const struct dev_pm_ops st_dwc3_dev_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(st_dwc3_suspend, st_dwc3_resume)
+};
+
+static struct of_device_id st_dwc3_match[] = {
+	{ .compatible = "st,stih407-dwc3" },
+	{ /* sentinel */ },
+};
+
+MODULE_DEVICE_TABLE(of, st_dwc3_match);
+
+static struct platform_driver st_dwc3_driver = {
+	.probe = st_dwc3_probe,
+	.remove = st_dwc3_remove,
+	.driver = {
+		.name = "usb-st-dwc3",
+		.owner = THIS_MODULE,
+		.of_match_table = of_match_ptr(st_dwc3_match),
+		.pm = &st_dwc3_dev_pm_ops,
+	},
+};
+
+module_platform_driver(st_dwc3_driver);
+
+MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
+MODULE_DESCRIPTION("DesignWare USB3 STi Glue Layer");
+MODULE_LICENSE("GPL v2");
-- 
1.9.1

Re: [PATCH 1/3] usb: dwc3: add ST dwc3 glue layer to manage dwc3 HC

[Daniele Forsi]

2014-07-04 13:13 GMT+02:00 Peter Griffin:

> diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
> index 8eb996e..f7b0518 100644
> --- a/drivers/usb/dwc3/Kconfig
> +++ b/drivers/usb/dwc3/Kconfig
> @@ -77,6 +77,15 @@ config USB_DWC3_KEYSTONE
>         default USB_DWC3
>         help
>           Support of USB2/3 functionality in TI Keystone2 platforms.
> +
> +config USB_DWC3_ST
> +       tristate "STMicroelectronics Platforms"
> +       depends on ARCH_STI && OF
> +       default USB_DWC3_HOST
> +       help
> +         STMicroelectronics SoCs chip with one DesignWare Core USB3 IP
> +         inside (i.e. STiH407).
> +
>           Say 'Y' or 'M' here if you have one such device
>
>  comment "Debugging features"

you are actually removing the line "Say 'Y' or 'M' here if you have
one such device" from the previous item

-- 
Daniele Forsi

Re: [PATCH 1/3] usb: dwc3: add ST dwc3 glue layer to manage dwc3 HC

[Peter Griffin]

Hi Daniele,

Thankyou for reviewing.

> > +config USB_DWC3_ST
> > +       tristate "STMicroelectronics Platforms"
> > +       depends on ARCH_STI && OF
> > +       default USB_DWC3_HOST
> > +       help
> > +         STMicroelectronics SoCs chip with one DesignWare Core USB3 IP
> > +         inside (i.e. STiH407).
> > +
> >           Say 'Y' or 'M' here if you have one such device
> >
> >  comment "Debugging features"
> 
> you are actually removing the line "Say 'Y' or 'M' here if you have
> one such device" from the previous item

Whoops, good spot. I've fixed in V2, and added the same sentence for this
new entry as well.

I've also replaced "STMicroelectronics SoCs chip with one DesignWare Core"
with "STMicroelectronics SoCs with one DesignWare Core".

regards,

Peter.

[PATCH 2/3] ARM: dts: sti: Add st-dwc3 devicetree bindings documentation

[Peter Griffin]

This patch documents the device tree documentation required for
the ST usb3 controller glue layer found in STiH407 devices.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro-qxv4g6HH51o@public.gmane.org>
Signed-off-by: Peter Griffin <peter.griffin-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
---
 Documentation/devicetree/bindings/usb/dwc3-st.txt | 58 +++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/dwc3-st.txt

diff --git a/Documentation/devicetree/bindings/usb/dwc3-st.txt b/Documentation/devicetree/bindings/usb/dwc3-st.txt
new file mode 100644
index 0000000..f14e5da
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/dwc3-st.txt
@@ -0,0 +1,58 @@
+ST DWC3 glue logic
+
+This file documents the parameters for the dwc3-st driver.
+This driver provides the glue logic to use the dwc3 on STiH407 based platforms.
+
+Required properties:
+ - compatible	: must be "st,stih407-dwc3"
+ - reg		: glue logic base address and USB syscfg ctrl register offest
+ - reg-names	: Should be "reg-glue" and "syscfg-reg".
+ - st,syscon    : should be phandle to system configuration node which
+		  encompases the glue registers.
+ - resets       : phandle pointing to the system powerdown controller
+See: Documentation/devicetree/bindings/reset/st,sti-powerdown.txt
+See: Documentation/devicetree/bindings/reset/reset.txt
+
+ - #address-cells, #size-cells : should be '1' if the device has sub-nodes
+                                 with 'reg' property.
+
+ - pinctl-names : A pinctrl state named "default" must be defined.
+See: Documentation/devicetree/bindings/pinctrl/pinctrl-binding.txt.
+
+ - pinctrl-0	: Pin control group
+See: Documentation/devicetree/bindings/pinctrl/pinctrl-binding.txt.
+
+ - ranges: allows valid 1:1 translation between child's address space and
+   parent's address space.
+
+Optional properties:
+ - st,dwc3-drd-device: to program the HC as "device" (static setup)
+
+Sub-nodes:
+The dwc3 core should be added as subnode to ST DWC3 glue as shown in the
+example below. The DT binding details of dwc3 can be found in:
+Documentation/devicetree/bindings/usb/dwc3.txt
+
+Example:
+
+st_dwc3: dwc3@8f94000 {
+	status		= "disabled";
+	compatible	= "st,stih407-dwc3";
+	reg		= <0x08f94000 0x1000>, <0x110 0x4>;
+	reg-names	= "reg-glue", "syscfg-reg";
+	st,syscfg	= <&syscfg_core>;
+	resets          = <&powerdown STIH407_USB3_POWERDOWN>;
+	#address-cells	= <1>;
+	#size-cells	= <1>;
+	pinctrl-names	= "default";
+	pinctrl-0	= <&pinctrl_usb3>;
+	ranges;
+
+	dwc3: dwc3@9900000 {
+		compatible	= "synopsys,dwc3";
+		reg		= <0x09900000 0x100000>;
+		interrupts	=  <GIC_SPI 155 IRQ_TYPE_NONE>;
+
+		usb-phy = <&usb2_phy>, <&usb3_phy>;
+	};
+};
-- 
1.9.1

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Re: [PATCH 2/3] ARM: dts: sti: Add st-dwc3 devicetree bindings documentation

[Daniele Forsi]

2014-07-04 13:13 GMT+02:00 Peter Griffin:

> +Required properties:
> + - compatible  : must be "st,stih407-dwc3"
> + - reg         : glue logic base address and USB syscfg ctrl register offest
> + - reg-names   : Should be "reg-glue" and "syscfg-reg".
> + - st,syscon    : should be phandle to system configuration node which
> +                 encompases the glue registers.
> + - resets       : phandle pointing to the system powerdown controller

minor knits:
s/offest/offset/
s/encompases/encompasses/
"Should" is upper case while all other lines in this block start with
a lower case letter;
two lines end with a full stop, three lines without;
colons the last lines do not align to the first three

-- 
Daniele Forsi
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Re: [PATCH 2/3] ARM: dts: sti: Add st-dwc3 devicetree bindings documentation

[Peter Griffin]

Hi Daniele,

Thanks for reviewing.

On Fri, 04 Jul 2014, Daniele Forsi wrote:
> 2014-07-04 13:13 GMT+02:00 Peter Griffin:
> 
> > +Required properties:
> > + - compatible  : must be "st,stih407-dwc3"
> > + - reg         : glue logic base address and USB syscfg ctrl register offest
> > + - reg-names   : Should be "reg-glue" and "syscfg-reg".
> > + - st,syscon    : should be phandle to system configuration node which
> > +                 encompases the glue registers.
> > + - resets       : phandle pointing to the system powerdown controller
> 
> minor knits:
> s/offest/offset/
> s/encompases/encompasses/
> "Should" is upper case while all other lines in this block start with
> a lower case letter;
> two lines end with a full stop, three lines without;
> colons the last lines do not align to the first three

All fixed in V2.

Regards,

Peter.

[PATCH 3/3] MAINTAINERS: Add dwc3-st.c file to ARCH/STI architecture

[Peter Griffin]

Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
---
 MAINTAINERS | 1 +
 1 file changed, 1 insertion(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 702ca10..269ad3b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1325,6 +1325,7 @@ F:	drivers/pinctrl/pinctrl-st.c
 F:	drivers/media/rc/st_rc.c
 F:	drivers/i2c/busses/i2c-st.c
 F:	drivers/tty/serial/st-asc.c
+F:	drivers/usb/dwc3/dwc3-st.c
 
 ARM/TECHNOLOGIC SYSTEMS TS7250 MACHINE SUPPORT
 M:	Lennert Buytenhek <kernel@wantstofly.org>
-- 
1.9.1