This patch adds support for a usb role switch driver. And then,
this driver uses the usb role switch APIs instead of hardware
access to initialize usb host side at specific timings.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
---
drivers/usb/gadget/udc/Kconfig | 1 +
drivers/usb/gadget/udc/renesas_usb3.c | 34 ++++++++++++++++++++++++++++------
2 files changed, 29 insertions(+), 6 deletions(-)
diff --git a/drivers/usb/gadget/udc/Kconfig b/drivers/usb/gadget/udc/Kconfig
index 0875d38..7e4a5dd 100644
--- a/drivers/usb/gadget/udc/Kconfig
+++ b/drivers/usb/gadget/udc/Kconfig
@@ -193,6 +193,7 @@ config USB_RENESAS_USB3
tristate 'Renesas USB3.0 Peripheral controller'
depends on ARCH_RENESAS || COMPILE_TEST
depends on EXTCON && HAS_DMA
+ select USB_ROLE_SWITCH
help
Renesas USB3.0 Peripheral controller is a USB peripheral controller
that supports super, high, and full speed USB 3.0 data transfers.
diff --git a/drivers/usb/gadget/udc/renesas_usb3.c b/drivers/usb/gadget/udc/renesas_usb3.c
index 409cde4..5b7b1ce 100644
--- a/drivers/usb/gadget/udc/renesas_usb3.c
+++ b/drivers/usb/gadget/udc/renesas_usb3.c
@@ -23,6 +23,7 @@
#include <linux/uaccess.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
+#include <linux/usb/role.h>
/* register definitions */
#define USB3_AXI_INT_STA 0x008
@@ -330,6 +331,7 @@ struct renesas_usb3 {
struct usb_gadget gadget;
struct usb_gadget_driver *driver;
+ struct usb_role_switch *role_sw; /* Optional */
struct extcon_dev *extcon;
struct work_struct extcon_work;
struct phy *phy;
@@ -454,7 +456,11 @@ static void usb3_disable_pipe_irq(struct renesas_usb3 *usb3, int num)
static bool usb3_is_host(struct renesas_usb3 *usb3)
{
- return !(usb3_read(usb3, USB3_DRD_CON) & DRD_CON_PERI_CON);
+ if (usb3->role_sw)
+ return usb_role_switch_get_role(usb3->role_sw) ==
+ USB_ROLE_HOST ? true : false;
+ else
+ return !(usb3_read(usb3, USB3_DRD_CON) & DRD_CON_PERI_CON);
}
static void usb3_init_axi_bridge(struct renesas_usb3 *usb3)
@@ -645,10 +651,16 @@ static void usb3_check_vbus(struct renesas_usb3 *usb3)
static void usb3_set_mode(struct renesas_usb3 *usb3, bool host)
{
- if (host)
- usb3_clear_bit(usb3, DRD_CON_PERI_CON, USB3_DRD_CON);
- else
- usb3_set_bit(usb3, DRD_CON_PERI_CON, USB3_DRD_CON);
+ if (usb3->role_sw) {
+ enum usb_role role = host ? USB_ROLE_HOST : USB_ROLE_DEVICE;
+
+ usb_role_switch_set_role(usb3->role_sw, role);
+ } else {
+ if (host)
+ usb3_clear_bit(usb3, DRD_CON_PERI_CON, USB3_DRD_CON);
+ else
+ usb3_set_bit(usb3, DRD_CON_PERI_CON, USB3_DRD_CON);
+ }
}
static void usb3_vbus_out(struct renesas_usb3 *usb3, bool enable)
@@ -663,8 +675,8 @@ static void usb3_mode_config(struct renesas_usb3 *usb3, bool host, bool a_dev)
{
unsigned long flags;
- spin_lock_irqsave(&usb3->lock, flags);
usb3_set_mode(usb3, host);
+ spin_lock_irqsave(&usb3->lock, flags);
usb3_vbus_out(usb3, a_dev);
/* for A-Peripheral or forced B-device mode */
if ((!host && a_dev) ||
@@ -2238,6 +2250,10 @@ static int renesas_usb3_start(struct usb_gadget *gadget,
/* hook up the driver */
usb3->driver = driver;
+ usb3->role_sw = usb_role_switch_get_by_graph(usb3_to_dev(usb3), 0, 0);
+ if (IS_ERR_OR_NULL(usb3->role_sw))
+ usb3->role_sw = NULL;
+
if (usb3->phy)
phy_init(usb3->phy);
@@ -2260,6 +2276,8 @@ static int renesas_usb3_stop(struct usb_gadget *gadget)
if (usb3->phy)
phy_exit(usb3->phy);
+ usb_role_switch_put(usb3->role_sw);
+
pm_runtime_put(usb3_to_dev(usb3));
return 0;
@@ -2632,6 +2650,10 @@ static int renesas_usb3_probe(struct platform_device *pdev)
if (ret < 0)
goto err_add_udc;
+ ret = devm_of_platform_populate(&pdev->dev);
+ if (ret < 0)
+ goto err_dev_create;
+
ret = device_create_file(&pdev->dev, &dev_attr_role);
if (ret < 0)
goto err_dev_create;
--
1.9.1
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