diff mbox series

[v5,3/5] usb: misc: eud: Add driver support for SM6115 / SM4250

Message ID 20230516213308.2432018-4-bhupesh.sharma@linaro.org
State Superseded
Headers show
Series Add Qualcomm SM6115 / SM4250 EUD dt-bindings & driver support | expand

Commit Message

Bhupesh Sharma May 16, 2023, 9:33 p.m. UTC
Add SM6115 / SM4250 SoC EUD support in qcom_eud driver.

On some SoCs (like the SM6115 / SM4250 SoC), the mode manager
needs to be accessed only via the secure world (through 'scm'
calls).

Also, the enable bit inside 'tcsr_check_reg' needs to be set
first to set the eud in 'enable' mode on these SoCs.

Signed-off-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>
---
 drivers/usb/misc/Kconfig    |  1 +
 drivers/usb/misc/qcom_eud.c | 69 +++++++++++++++++++++++++++++++++----
 2 files changed, 63 insertions(+), 7 deletions(-)

Comments

Greg KH May 17, 2023, 4:50 a.m. UTC | #1
On Wed, May 17, 2023 at 03:03:06AM +0530, Bhupesh Sharma wrote:
> Add SM6115 / SM4250 SoC EUD support in qcom_eud driver.

Why is the subject line duplicated here?

> On some SoCs (like the SM6115 / SM4250 SoC), the mode manager
> needs to be accessed only via the secure world (through 'scm'
> calls).
> 
> Also, the enable bit inside 'tcsr_check_reg' needs to be set
> first to set the eud in 'enable' mode on these SoCs.
> 
> Signed-off-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>
> ---
>  drivers/usb/misc/Kconfig    |  1 +
>  drivers/usb/misc/qcom_eud.c | 69 +++++++++++++++++++++++++++++++++----

Given that you didn't cc the usb maintainer, I'm guessing you don't want
this patch applied?

>  2 files changed, 63 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/usb/misc/Kconfig b/drivers/usb/misc/Kconfig
> index 99b15b77dfd5..fe1b5fec1dfc 100644
> --- a/drivers/usb/misc/Kconfig
> +++ b/drivers/usb/misc/Kconfig
> @@ -147,6 +147,7 @@ config USB_APPLEDISPLAY
>  config USB_QCOM_EUD
>  	tristate "QCOM Embedded USB Debugger(EUD) Driver"
>  	depends on ARCH_QCOM || COMPILE_TEST
> +	select QCOM_SCM

How well is that going to work on building on non-QCOM systems?  Can
QCOM_SCM build if COMPILE_TEST is enabled?  select is rough to get
right, are you sure it's correct here?  If so, some documentation in the
changelog would be appreciated.

>  	select USB_ROLE_SWITCH
>  	help
>  	  This module enables support for Qualcomm Technologies, Inc.
> diff --git a/drivers/usb/misc/qcom_eud.c b/drivers/usb/misc/qcom_eud.c
> index b7f13df00764..10d194604d4c 100644
> --- a/drivers/usb/misc/qcom_eud.c
> +++ b/drivers/usb/misc/qcom_eud.c
> @@ -5,12 +5,14 @@
>  
>  #include <linux/bitops.h>
>  #include <linux/err.h>
> +#include <linux/firmware/qcom/qcom_scm.h>

There's no rule to keep these sorted, but it's your choice...

>  #include <linux/interrupt.h>
>  #include <linux/io.h>
>  #include <linux/iopoll.h>
>  #include <linux/kernel.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
> +#include <linux/of_device.h>
>  #include <linux/platform_device.h>
>  #include <linux/slab.h>
>  #include <linux/sysfs.h>
> @@ -22,23 +24,33 @@
>  #define EUD_REG_VBUS_INT_CLR	0x0080
>  #define EUD_REG_CSR_EUD_EN	0x1014
>  #define EUD_REG_SW_ATTACH_DET	0x1018
> -#define EUD_REG_EUD_EN2        0x0000
> +#define EUD_REG_EUD_EN2		0x0000

Why the coding style cleanup in the same patch?  Remember, changes only
do one thing, and you have already listed 2 things in your commit
message :(

>  
>  #define EUD_ENABLE		BIT(0)
> -#define EUD_INT_PET_EUD	BIT(0)
> +#define EUD_INT_PET_EUD		BIT(0)

Again, why this change?

thanks,

greg k-h
Bhupesh Sharma May 17, 2023, 6:33 a.m. UTC | #2
Hi Greg,

On Wed, 17 May 2023 at 10:21, Greg KH <gregkh@linuxfoundation.org> wrote:
>
> On Wed, May 17, 2023 at 03:03:06AM +0530, Bhupesh Sharma wrote:
> > Add SM6115 / SM4250 SoC EUD support in qcom_eud driver.
>
> Why is the subject line duplicated here?
>
> > On some SoCs (like the SM6115 / SM4250 SoC), the mode manager
> > needs to be accessed only via the secure world (through 'scm'
> > calls).
> >
> > Also, the enable bit inside 'tcsr_check_reg' needs to be set
> > first to set the eud in 'enable' mode on these SoCs.
> >
> > Signed-off-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>
> > ---
> >  drivers/usb/misc/Kconfig    |  1 +
> >  drivers/usb/misc/qcom_eud.c | 69 +++++++++++++++++++++++++++++++++----
>
> Given that you didn't cc the usb maintainer, I'm guessing you don't want
> this patch applied?

Oops, I will do that in the next version.

> >  2 files changed, 63 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/usb/misc/Kconfig b/drivers/usb/misc/Kconfig
> > index 99b15b77dfd5..fe1b5fec1dfc 100644
> > --- a/drivers/usb/misc/Kconfig
> > +++ b/drivers/usb/misc/Kconfig
> > @@ -147,6 +147,7 @@ config USB_APPLEDISPLAY
> >  config USB_QCOM_EUD
> >       tristate "QCOM Embedded USB Debugger(EUD) Driver"
> >       depends on ARCH_QCOM || COMPILE_TEST
> > +     select QCOM_SCM
>
> How well is that going to work on building on non-QCOM systems?  Can
> QCOM_SCM build if COMPILE_TEST is enabled?  select is rough to get
> right, are you sure it's correct here?  If so, some documentation in the
> changelog would be appreciated.

Ok, I will double check.

> >       select USB_ROLE_SWITCH
> >       help
> >         This module enables support for Qualcomm Technologies, Inc.
> > diff --git a/drivers/usb/misc/qcom_eud.c b/drivers/usb/misc/qcom_eud.c
> > index b7f13df00764..10d194604d4c 100644
> > --- a/drivers/usb/misc/qcom_eud.c
> > +++ b/drivers/usb/misc/qcom_eud.c
> > @@ -5,12 +5,14 @@
> >
> >  #include <linux/bitops.h>
> >  #include <linux/err.h>
> > +#include <linux/firmware/qcom/qcom_scm.h>
>
> There's no rule to keep these sorted, but it's your choice...

Sure.

> >  #include <linux/interrupt.h>
> >  #include <linux/io.h>
> >  #include <linux/iopoll.h>
> >  #include <linux/kernel.h>
> >  #include <linux/module.h>
> >  #include <linux/of.h>
> > +#include <linux/of_device.h>
> >  #include <linux/platform_device.h>
> >  #include <linux/slab.h>
> >  #include <linux/sysfs.h>
> > @@ -22,23 +24,33 @@
> >  #define EUD_REG_VBUS_INT_CLR 0x0080
> >  #define EUD_REG_CSR_EUD_EN   0x1014
> >  #define EUD_REG_SW_ATTACH_DET        0x1018
> > -#define EUD_REG_EUD_EN2        0x0000
> > +#define EUD_REG_EUD_EN2              0x0000
>
> Why the coding style cleanup in the same patch?  Remember, changes only
> do one thing, and you have already listed 2 things in your commit
> message :(

Sure, will spin a separate patch for cleanups.

> >  #define EUD_ENABLE           BIT(0)
> > -#define EUD_INT_PET_EUD      BIT(0)
> > +#define EUD_INT_PET_EUD              BIT(0)
>
> Again, why this change?

Ack.
Will send a v6 shortly.

Thanks,
Bhupesh
diff mbox series

Patch

diff --git a/drivers/usb/misc/Kconfig b/drivers/usb/misc/Kconfig
index 99b15b77dfd5..fe1b5fec1dfc 100644
--- a/drivers/usb/misc/Kconfig
+++ b/drivers/usb/misc/Kconfig
@@ -147,6 +147,7 @@  config USB_APPLEDISPLAY
 config USB_QCOM_EUD
 	tristate "QCOM Embedded USB Debugger(EUD) Driver"
 	depends on ARCH_QCOM || COMPILE_TEST
+	select QCOM_SCM
 	select USB_ROLE_SWITCH
 	help
 	  This module enables support for Qualcomm Technologies, Inc.
diff --git a/drivers/usb/misc/qcom_eud.c b/drivers/usb/misc/qcom_eud.c
index b7f13df00764..10d194604d4c 100644
--- a/drivers/usb/misc/qcom_eud.c
+++ b/drivers/usb/misc/qcom_eud.c
@@ -5,12 +5,14 @@ 
 
 #include <linux/bitops.h>
 #include <linux/err.h>
+#include <linux/firmware/qcom/qcom_scm.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/iopoll.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/sysfs.h>
@@ -22,23 +24,33 @@ 
 #define EUD_REG_VBUS_INT_CLR	0x0080
 #define EUD_REG_CSR_EUD_EN	0x1014
 #define EUD_REG_SW_ATTACH_DET	0x1018
-#define EUD_REG_EUD_EN2        0x0000
+#define EUD_REG_EUD_EN2		0x0000
 
 #define EUD_ENABLE		BIT(0)
-#define EUD_INT_PET_EUD	BIT(0)
+#define EUD_INT_PET_EUD		BIT(0)
 #define EUD_INT_VBUS		BIT(2)
 #define EUD_INT_SAFE_MODE	BIT(4)
 #define EUD_INT_ALL		(EUD_INT_VBUS | EUD_INT_SAFE_MODE)
 
+#define EUD_EN2_EN		BIT(0)
+#define EUD_EN2_DISABLE		(0)
+#define TCSR_CHECK_EN		BIT(0)
+
+struct eud_soc_cfg {
+	u32 tcsr_check_offset;
+};
+
 struct eud_chip {
 	struct device			*dev;
 	struct usb_role_switch		*role_sw;
+	const struct eud_soc_cfg	*eud_cfg;
 	void __iomem			*base;
 	void __iomem			*mode_mgr;
 	unsigned int			int_status;
 	int				irq;
 	bool				enabled;
 	bool				usb_attached;
+	phys_addr_t			secure_mode_mgr;
 };
 
 static int enable_eud(struct eud_chip *priv)
@@ -46,7 +58,11 @@  static int enable_eud(struct eud_chip *priv)
 	writel(EUD_ENABLE, priv->base + EUD_REG_CSR_EUD_EN);
 	writel(EUD_INT_VBUS | EUD_INT_SAFE_MODE,
 			priv->base + EUD_REG_INT1_EN_MASK);
-	writel(1, priv->mode_mgr + EUD_REG_EUD_EN2);
+
+	if (priv->secure_mode_mgr)
+		qcom_scm_io_writel(priv->secure_mode_mgr + EUD_REG_EUD_EN2, EUD_EN2_EN);
+	else
+		writel(EUD_EN2_EN, priv->mode_mgr + EUD_REG_EUD_EN2);
 
 	return usb_role_switch_set_role(priv->role_sw, USB_ROLE_DEVICE);
 }
@@ -54,7 +70,11 @@  static int enable_eud(struct eud_chip *priv)
 static void disable_eud(struct eud_chip *priv)
 {
 	writel(0, priv->base + EUD_REG_CSR_EUD_EN);
-	writel(0, priv->mode_mgr + EUD_REG_EUD_EN2);
+
+	if (priv->secure_mode_mgr)
+		qcom_scm_io_writel(priv->secure_mode_mgr + EUD_REG_EUD_EN2, EUD_EN2_DISABLE);
+	else
+		writel(EUD_EN2_DISABLE, priv->mode_mgr + EUD_REG_EUD_EN2);
 }
 
 static ssize_t enable_show(struct device *dev,
@@ -178,6 +198,8 @@  static void eud_role_switch_release(void *data)
 static int eud_probe(struct platform_device *pdev)
 {
 	struct eud_chip *chip;
+	struct resource *res;
+	phys_addr_t tcsr_check;
 	int ret;
 
 	chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
@@ -200,9 +222,37 @@  static int eud_probe(struct platform_device *pdev)
 	if (IS_ERR(chip->base))
 		return PTR_ERR(chip->base);
 
-	chip->mode_mgr = devm_platform_ioremap_resource(pdev, 1);
-	if (IS_ERR(chip->mode_mgr))
-		return PTR_ERR(chip->mode_mgr);
+	/*
+	 * EUD block on a few Qualcomm SoCs needs secure register access.
+	 * Check for the same.
+	 */
+	if (of_device_is_compatible(chip->dev->of_node, "qcom,sm6115-eud")) {
+		res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+		if (!res)
+			return dev_err_probe(chip->dev, -ENODEV,
+					     "failed to get secure_mode_mgr reg base\n");
+
+		chip->secure_mode_mgr = res->start;
+	} else {
+		chip->mode_mgr = devm_platform_ioremap_resource(pdev, 1);
+		if (IS_ERR(chip->mode_mgr))
+			return PTR_ERR(chip->mode_mgr);
+	}
+
+	/* Check for any SoC specific config data */
+	chip->eud_cfg = of_device_get_match_data(&pdev->dev);
+	if (chip->eud_cfg) {
+		res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "tcsr-base");
+		if (!res)
+			return dev_err_probe(chip->dev, -ENODEV,
+					     "failed to get tcsr reg base\n");
+
+		tcsr_check = res->start + chip->eud_cfg->tcsr_check_offset;
+
+		ret = qcom_scm_io_writel(tcsr_check, TCSR_CHECK_EN);
+		if (ret)
+			return dev_err_probe(chip->dev, ret, "failed to write tcsr check reg\n");
+	}
 
 	chip->irq = platform_get_irq(pdev, 0);
 	ret = devm_request_threaded_irq(&pdev->dev, chip->irq, handle_eud_irq,
@@ -230,8 +280,13 @@  static int eud_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct eud_soc_cfg sm6115_eud_cfg = {
+	.tcsr_check_offset = 0x25018,
+};
+
 static const struct of_device_id eud_dt_match[] = {
 	{ .compatible = "qcom,sc7280-eud" },
+	{ .compatible = "qcom,sm6115-eud", .data = &sm6115_eud_cfg },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, eud_dt_match);