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Date: Tue, 5 May 2015 18:13:15 +0530
From: Ramneek Mehresh <ramneek.mehresh@...escale.com>
To: <linux-kernel@...r.kernel.org>
CC: <balbi@...com>, <stern@...land.harvard.edu>,
<gregkh@...uxfoundation.org>,
Ramneek Mehresh <ramneek.mehresh@...escale.com>
Subject: [PATCH 2/9][v3]usb:fsl:otg: Add support to add/remove usb host driver
Add workqueue to add/remove host driver (outside interrupt context)
upon each id change
Signed-off-by: Ramneek Mehresh <ramneek.mehresh@...escale.com>
---
Changes for v3:
- use overrides for ehci_fsl_overrides
- remove struct ehci_hcd from ehci_fsl
- move ehci_fsl to ehci-fsl.h
drivers/usb/host/ehci-fsl.c | 132 ++++++++++++++++++++++++--------------------
drivers/usb/host/ehci-fsl.h | 20 +++++++
drivers/usb/host/ehci-hcd.c | 10 ++++
drivers/usb/host/ehci.h | 6 ++
4 files changed, 108 insertions(+), 60 deletions(-)
diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
index ab4eee3..b2f5949 100644
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -33,6 +33,33 @@
#include "ehci-fsl.h"
+#if defined(CONFIG_FSL_USB2_OTG) || defined(CONFIG_FSL_USB2_OTG_MODULE)
+static struct ehci_fsl *hcd_to_ehci_fsl(struct usb_hcd *hcd)
+{
+ return (struct ehci_fsl *)hcd_to_ehci(hcd)->priv;
+}
+
+static void do_change_hcd(struct work_struct *work)
+{
+ struct ehci_fsl *ehci_fsl = container_of(work, struct ehci_fsl,
+ change_hcd_work);
+ struct usb_hcd *hcd = ehci_fsl->hcd;
+ void __iomem *non_ehci = hcd->regs;
+ int retval;
+
+ if (ehci_fsl->hcd_add && !ehci_fsl->have_hcd) {
+ writel(USBMODE_CM_HOST, non_ehci + FSL_SOC_USB_USBMODE);
+ /* host, gadget and otg share same int line */
+ retval = usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
+ if (retval == 0)
+ ehci_fsl->have_hcd = 1;
+ } else if (!ehci_fsl->hcd_add && ehci_fsl->have_hcd) {
+ usb_remove_hcd(hcd);
+ ehci_fsl->have_hcd = 0;
+ }
+}
+#endif
+
/* configure so an HC device and id are always provided */
/* always called with process context; sleeping is OK */
@@ -126,11 +153,16 @@ static int usb_hcd_fsl_probe(const struct hc_driver *driver,
goto err2;
device_wakeup_enable(hcd->self.controller);
-#ifdef CONFIG_USB_OTG
+#if defined(CONFIG_FSL_USB2_OTG) || defined(CONFIG_FSL_USB2_OTG_MODULE)
if (pdata->operating_mode == FSL_USB2_DR_OTG) {
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ struct ehci_fsl *ehci_fsl = hcd_to_ehci_fsl(hcd);
+ ehci_fsl->hcd = hcd;
hcd->usb_phy = usb_get_phy(USB_PHY_TYPE_USB2);
+
+ INIT_WORK(&ehci_fsl->change_hcd_work, do_change_hcd);
+
dev_dbg(&pdev->dev, "hcd=0x%p ehci=0x%p, phy=0x%p\n",
hcd, ehci, hcd->usb_phy);
@@ -376,15 +408,6 @@ static int ehci_fsl_setup(struct usb_hcd *hcd)
return retval;
}
-struct ehci_fsl {
- struct ehci_hcd ehci;
-
-#ifdef CONFIG_PM
- /* Saved USB PHY settings, need to restore after deep sleep. */
- u32 usb_ctrl;
-#endif
-};
-
#ifdef CONFIG_PM
#ifdef CONFIG_PPC_MPC512x
@@ -532,24 +555,32 @@ static inline int ehci_fsl_mpc512x_drv_resume(struct device *dev)
}
#endif /* CONFIG_PPC_MPC512x */
-static struct ehci_fsl *hcd_to_ehci_fsl(struct usb_hcd *hcd)
-{
- struct ehci_hcd *ehci = hcd_to_ehci(hcd);
-
- return container_of(ehci, struct ehci_fsl, ehci);
-}
-
static int ehci_fsl_drv_suspend(struct device *dev)
{
struct usb_hcd *hcd = dev_get_drvdata(dev);
- struct ehci_fsl *ehci_fsl = hcd_to_ehci_fsl(hcd);
void __iomem *non_ehci = hcd->regs;
+#if defined(CONFIG_FSL_USB2_OTG) || defined(CONFIG_FSL_USB2_OTG_MODULE)
+ struct ehci_fsl *ehci_fsl = hcd_to_ehci_fsl(hcd);
+ struct usb_bus host = hcd->self;
+#endif
if (of_device_is_compatible(dev->parent->of_node,
"fsl,mpc5121-usb2-dr")) {
return ehci_fsl_mpc512x_drv_suspend(dev);
}
+#if defined(CONFIG_FSL_USB2_OTG) || defined(CONFIG_FSL_USB2_OTG_MODULE)
+ if (host.is_otg) {
+ /*struct ehci_hcd *ehci = hcd_to_ehci(hcd);*/
+
+ /* remove hcd */
+ ehci_fsl->hcd_add = 0;
+ schedule_work(&ehci_fsl->change_hcd_work);
+ host.is_otg = 0;
+ return 0;
+ }
+#endif
+
ehci_prepare_ports_for_controller_suspend(hcd_to_ehci(hcd),
device_may_wakeup(dev));
if (!fsl_deep_sleep())
@@ -562,15 +593,29 @@ static int ehci_fsl_drv_suspend(struct device *dev)
static int ehci_fsl_drv_resume(struct device *dev)
{
struct usb_hcd *hcd = dev_get_drvdata(dev);
- struct ehci_fsl *ehci_fsl = hcd_to_ehci_fsl(hcd);
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
void __iomem *non_ehci = hcd->regs;
+#if defined(CONFIG_FSL_USB2_OTG) || defined(CONFIG_FSL_USB2_OTG_MODULE)
+ struct ehci_fsl *ehci_fsl = hcd_to_ehci_fsl(hcd);
+ struct usb_bus host = hcd->self;
+#endif
if (of_device_is_compatible(dev->parent->of_node,
"fsl,mpc5121-usb2-dr")) {
return ehci_fsl_mpc512x_drv_resume(dev);
}
+#if defined(CONFIG_FSL_USB2_OTG) || defined(CONFIG_FSL_USB2_OTG_MODULE)
+ if (host.is_otg) {
+ /* add hcd */
+ ehci_fsl->hcd_add = 1;
+ schedule_work(&ehci_fsl->change_hcd_work);
+ usb_hcd_resume_root_hub(hcd);
+ host.is_otg = 0;
+ return 0;
+ }
+#endif
+
ehci_prepare_ports_for_controller_resume(ehci);
if (!fsl_deep_sleep())
return 0;
@@ -636,60 +681,27 @@ static int ehci_start_port_reset(struct usb_hcd *hcd, unsigned port)
#define ehci_start_port_reset NULL
#endif /* CONFIG_USB_OTG */
+static struct hc_driver __read_mostly ehci_fsl_hc_driver;
-static const struct hc_driver ehci_fsl_hc_driver = {
- .description = hcd_name,
+static struct ehci_driver_overrides ehci_fsl_overrides __initdata = {
.product_desc = "Freescale On-Chip EHCI Host Controller",
- .hcd_priv_size = sizeof(struct ehci_fsl),
-
- /*
- * generic hardware linkage
- */
- .irq = ehci_irq,
- .flags = HCD_USB2 | HCD_MEMORY | HCD_BH,
-
- /*
- * basic lifecycle operations
- */
+ .extra_priv_size = sizeof(struct ehci_fsl),
.reset = ehci_fsl_setup,
.start = ehci_run,
- .stop = ehci_stop,
- .shutdown = ehci_shutdown,
-
- /*
- * managing i/o requests and associated device resources
- */
- .urb_enqueue = ehci_urb_enqueue,
- .urb_dequeue = ehci_urb_dequeue,
- .endpoint_disable = ehci_endpoint_disable,
- .endpoint_reset = ehci_endpoint_reset,
-
- /*
- * scheduling support
- */
- .get_frame_number = ehci_get_frame,
-
- /*
- * root hub support
- */
- .hub_status_data = ehci_hub_status_data,
- .hub_control = ehci_hub_control,
- .bus_suspend = ehci_bus_suspend,
- .bus_resume = ehci_bus_resume,
.start_port_reset = ehci_start_port_reset,
- .relinquish_port = ehci_relinquish_port,
- .port_handed_over = ehci_port_handed_over,
-
- .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
};
static int ehci_fsl_drv_probe(struct platform_device *pdev)
{
+ struct hc_driver *driver = &ehci_fsl_hc_driver;
+
+ ehci_init_driver(driver, &ehci_fsl_overrides);
+
if (usb_disabled())
return -ENODEV;
/* FIXME we only want one one probe() not two */
- return usb_hcd_fsl_probe(&ehci_fsl_hc_driver, pdev);
+ return usb_hcd_fsl_probe(driver, pdev);
}
static int ehci_fsl_drv_remove(struct platform_device *pdev)
diff --git a/drivers/usb/host/ehci-fsl.h b/drivers/usb/host/ehci-fsl.h
index dbd292e..c2e38f2 100644
--- a/drivers/usb/host/ehci-fsl.h
+++ b/drivers/usb/host/ehci-fsl.h
@@ -61,5 +61,25 @@
#define PLL_RESET (1<<8)
#define UTMI_PHY_EN (1<<9)
#define ULPI_PHY_CLK_SEL (1<<10)
+
#define PHY_CLK_VALID (1<<17)
+
+struct ehci_fsl {
+#ifdef CONFIG_PM
+ /* Saved USB PHY settings, need to restore after deep sleep. */
+ u32 usb_ctrl;
+#endif
+ struct usb_hcd *hcd;
+#if defined(CONFIG_FSL_USB2_OTG) || defined(CONFIG_FSL_USB2_OTG_MODULE)
+ struct work_struct change_hcd_work;
+#endif
+ /* store current hcd state for otg;
+ * have_hcd is true when host drv al already part of otg framework,
+ * otherwise false;
+ * hcd_add is true when otg framework wants to add host
+ * drv as part of otg;flase when it wants to remove it
+ */
+ unsigned have_hcd:1;
+ unsigned hcd_add:1;
+};
#endif /* _EHCI_FSL_H */
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 85e56d1..d29cd85 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -1236,10 +1236,20 @@ void ehci_init_driver(struct hc_driver *drv,
if (over) {
drv->hcd_priv_size += over->extra_priv_size;
+ if (over->product_desc)
+ drv->product_desc = over->product_desc;
+ if (over->start)
+ drv->start = over->start;
+ if (over->stop)
+ drv->stop = over->stop;
+ if (over->shutdown)
+ drv->shutdown = over->shutdown;
if (over->reset)
drv->reset = over->reset;
if (over->port_power)
drv->port_power = over->port_power;
+ if (over->start_port_reset)
+ drv->start_port_reset = over->start_port_reset;
}
}
EXPORT_SYMBOL_GPL(ehci_init_driver);
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index 52ef084..f090243 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -857,10 +857,16 @@ static inline u32 hc32_to_cpup (const struct ehci_hcd *ehci, const __hc32 *x)
/* Declarations of things exported for use by ehci platform drivers */
struct ehci_driver_overrides {
+ const char *product_desc;
size_t extra_priv_size;
int (*reset)(struct usb_hcd *hcd);
+ int (*start)(struct usb_hcd *hcd);
+ void (*stop)(struct usb_hcd *hcd);
+ void (*shutdown)(struct usb_hcd *hcd);
int (*port_power)(struct usb_hcd *hcd,
int portnum, bool enable);
+ int (*start_port_reset)(struct usb_hcd *,
+ unsigned port_num);
};
extern void ehci_init_driver(struct hc_driver *drv,
--
1.8.3.1
--
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