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USB: gadget: Introduce ci13xxx_udc_driver struct 

Introduces ci13xxx_udc_driver struct for bus glue drivers to hint
ci13xxx_udc core about their special requirements.  The flags include
avoiding hardware register access when controller is not in peripheral
mode, enabling pull-up upon VBUS, disabling streaming mode and dependency
on transceiver driver.

Initialize gadget_ops in udc_probe so that transceiver can notify VBUS
presence even when no gadget driver is bounded.

A notify_event callback is embedded in the same struct. This patch implements
two events called CONTROLLER_RESET_EVENT and CONTROLLER_STOPPED_EVENT to
notify the bus glue driver after resetting and stopping the controller for
performing SoC specific quirks.

Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Pavankumar Kondeti 2010-12-07 17:54:02 +05:30 committed by Greg Kroah-Hartman
parent 61948ee4d5
commit f01ef5748f
3 changed files with 182 additions and 62 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/usb/gadget/ci13xxx_pci.c
View File

@ -38,6 +38,10 @@ static irqreturn_t ci13xxx_pci_irq(int irq, void *pdev)
return udc_irq();
}
static struct ci13xxx_udc_driver ci13xxx_pci_udc_driver = {
.name = UDC_DRIVER_NAME,
};
/**
* ci13xxx_pci_probe: PCI probe
* @pdev: USB device controller being probed
@ -82,7 +86,7 @@ static int __devinit ci13xxx_pci_probe(struct pci_dev *pdev,
pci_set_master(pdev);
pci_try_set_mwi(pdev);
retval = udc_probe(&pdev->dev, regs, UDC_DRIVER_NAME);
retval = udc_probe(&ci13xxx_pci_udc_driver, &pdev->dev, regs);
if (retval)
goto iounmap;

209
drivers/usb/gadget/ci13xxx_udc.c
View File

@ -62,6 +62,7 @@
#include <linux/slab.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/otg.h>
#include "ci13xxx_udc.h"
@ -126,6 +127,9 @@ static struct {
size_t size; /* bank size */
} hw_bank;
/* MSM specific */
#define ABS_AHBBURST (0x0090UL)
#define ABS_AHBMODE (0x0098UL)
/* UDC register map */
#define ABS_CAPLENGTH (0x100UL)
#define ABS_HCCPARAMS (0x108UL)
@ -242,13 +246,7 @@ static u32 hw_ctest_and_write(u32 addr, u32 mask, u32 data)
return (reg & mask) >> ffs_nr(mask);
}
/**
* hw_device_reset: resets chip (execute without interruption)
* @base: register base address
*
* This function returns an error code
*/
static int hw_device_reset(void __iomem *base)
static int hw_device_init(void __iomem *base)
{
u32 reg;
@ -265,25 +263,6 @@ static int hw_device_reset(void __iomem *base)
hw_bank.size += CAP_LAST;
hw_bank.size /= sizeof(u32);
/* should flush & stop before reset */
hw_cwrite(CAP_ENDPTFLUSH, ~0, ~0);
hw_cwrite(CAP_USBCMD, USBCMD_RS, 0);
hw_cwrite(CAP_USBCMD, USBCMD_RST, USBCMD_RST);
while (hw_cread(CAP_USBCMD, USBCMD_RST))
udelay(10); /* not RTOS friendly */
/* USBMODE should be configured step by step */
hw_cwrite(CAP_USBMODE, USBMODE_CM, USBMODE_CM_IDLE);
hw_cwrite(CAP_USBMODE, USBMODE_CM, USBMODE_CM_DEVICE);
hw_cwrite(CAP_USBMODE, USBMODE_SLOM, USBMODE_SLOM); /* HW >= 2.3 */
if (hw_cread(CAP_USBMODE, USBMODE_CM) != USBMODE_CM_DEVICE) {
pr_err("cannot enter in device mode");
pr_err("lpm = %i", hw_bank.lpm);
return -ENODEV;
}
reg = hw_aread(ABS_DCCPARAMS, DCCPARAMS_DEN) >> ffs_nr(DCCPARAMS_DEN);
if (reg == 0 || reg > ENDPT_MAX)
return -ENODEV;
@ -298,6 +277,43 @@ static int hw_device_reset(void __iomem *base)
return 0;
}
/**
* hw_device_reset: resets chip (execute without interruption)
* @base: register base address
*
* This function returns an error code
*/
static int hw_device_reset(struct ci13xxx *udc)
{
/* should flush & stop before reset */
hw_cwrite(CAP_ENDPTFLUSH, ~0, ~0);
hw_cwrite(CAP_USBCMD, USBCMD_RS, 0);
hw_cwrite(CAP_USBCMD, USBCMD_RST, USBCMD_RST);
while (hw_cread(CAP_USBCMD, USBCMD_RST))
udelay(10); /* not RTOS friendly */
if (udc->udc_driver->notify_event)
udc->udc_driver->notify_event(udc,
CI13XXX_CONTROLLER_RESET_EVENT);
if (udc->udc_driver->flags && CI13XXX_DISABLE_STREAMING)
hw_cwrite(CAP_USBMODE, USBMODE_SDIS, USBMODE_SDIS);
/* USBMODE should be configured step by step */
hw_cwrite(CAP_USBMODE, USBMODE_CM, USBMODE_CM_IDLE);
hw_cwrite(CAP_USBMODE, USBMODE_CM, USBMODE_CM_DEVICE);
hw_cwrite(CAP_USBMODE, USBMODE_SLOM, USBMODE_SLOM); /* HW >= 2.3 */
if (hw_cread(CAP_USBMODE, USBMODE_CM) != USBMODE_CM_DEVICE) {
pr_err("cannot enter in device mode");
pr_err("lpm = %i", hw_bank.lpm);
return -ENODEV;
}
return 0;
}
/**
* hw_device_state: enables/disables interrupts & starts/stops device (execute
@ -1551,8 +1567,6 @@ __acquires(mEp->lock)
* Caller must hold lock
*/
static int _gadget_stop_activity(struct usb_gadget *gadget)
__releases(udc->lock)
__acquires(udc->lock)
{
struct usb_ep *ep;
struct ci13xxx *udc = container_of(gadget, struct ci13xxx, gadget);
@ -1564,8 +1578,6 @@ __acquires(udc->lock)
if (gadget == NULL)
return -EINVAL;
spin_unlock(udc->lock);
/* flush all endpoints */
gadget_for_each_ep(ep, gadget) {
usb_ep_fifo_flush(ep);
@ -1585,8 +1597,6 @@ __acquires(udc->lock)
mEp->status = NULL;
}
spin_lock(udc->lock);
return 0;
}
@ -1615,6 +1625,7 @@ __acquires(udc->lock)
dbg_event(0xFF, "BUS RST", 0);
spin_unlock(udc->lock);
retval = _gadget_stop_activity(&udc->gadget);
if (retval)
goto done;
@ -1623,7 +1634,6 @@ __acquires(udc->lock)
if (retval)
goto done;
spin_unlock(udc->lock);
retval = usb_ep_enable(&mEp->ep, &ctrl_endpt_desc);
if (!retval) {
mEp->status = usb_ep_alloc_request(&mEp->ep, GFP_ATOMIC);
@ -2321,12 +2331,45 @@ static const struct usb_ep_ops usb_ep_ops = {
/******************************************************************************
* GADGET block
*****************************************************************************/
static int ci13xxx_vbus_session(struct usb_gadget *_gadget, int is_active)
{
struct ci13xxx *udc = container_of(_gadget, struct ci13xxx, gadget);
unsigned long flags;
int gadget_ready = 0;
if (!(udc->udc_driver->flags & CI13XXX_PULLUP_ON_VBUS))
return -EOPNOTSUPP;
spin_lock_irqsave(udc->lock, flags);
udc->vbus_active = is_active;
if (udc->driver)
gadget_ready = 1;
spin_unlock_irqrestore(udc->lock, flags);
if (gadget_ready) {
if (is_active) {
hw_device_reset(udc);
hw_device_state(udc->ci13xxx_ep[0].qh[RX].dma);
} else {
hw_device_state(0);
if (udc->udc_driver->notify_event)
udc->udc_driver->notify_event(udc,
CI13XXX_CONTROLLER_STOPPED_EVENT);
_gadget_stop_activity(&udc->gadget);
}
}
return 0;
}
/**
* Device operations part of the API to the USB controller hardware,
* which don't involve endpoints (or i/o)
* Check "usb_gadget.h" for details
*/
static const struct usb_gadget_ops usb_gadget_ops;
static const struct usb_gadget_ops usb_gadget_ops = {
.vbus_session = ci13xxx_vbus_session,
};
/**
* usb_gadget_probe_driver: register a gadget driver
@ -2379,7 +2422,6 @@ int usb_gadget_probe_driver(struct usb_gadget_driver *driver,
info("hw_ep_max = %d", hw_ep_max);
udc->driver = driver;
udc->gadget.ops = NULL;
udc->gadget.dev.driver = NULL;
retval = 0;
@ -2420,7 +2462,6 @@ int usb_gadget_probe_driver(struct usb_gadget_driver *driver,
/* bind gadget */
driver->driver.bus = NULL;
udc->gadget.ops = &usb_gadget_ops;
udc->gadget.dev.driver = &driver->driver;
spin_unlock_irqrestore(udc->lock, flags);
@ -2428,11 +2469,19 @@ int usb_gadget_probe_driver(struct usb_gadget_driver *driver,
spin_lock_irqsave(udc->lock, flags);
if (retval) {
udc->gadget.ops = NULL;
udc->gadget.dev.driver = NULL;
goto done;
}
if (udc->udc_driver->flags & CI13XXX_PULLUP_ON_VBUS) {
if (udc->vbus_active) {
if (udc->udc_driver->flags & CI13XXX_REGS_SHARED)
hw_device_reset(udc);
} else {
goto done;
}
}
retval = hw_device_state(udc->ci13xxx_ep[0].qh[RX].dma);
done:
@ -2466,19 +2515,21 @@ int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
spin_lock_irqsave(udc->lock, flags);
if (!(udc->udc_driver->flags & CI13XXX_PULLUP_ON_VBUS) ||
udc->vbus_active) {
hw_device_state(0);
if (udc->udc_driver->notify_event)
udc->udc_driver->notify_event(udc,
CI13XXX_CONTROLLER_STOPPED_EVENT);
_gadget_stop_activity(&udc->gadget);
}
/* unbind gadget */
if (udc->gadget.ops != NULL) {
_gadget_stop_activity(&udc->gadget);
spin_unlock_irqrestore(udc->lock, flags);
driver->unbind(&udc->gadget); /* MAY SLEEP */
spin_lock_irqsave(udc->lock, flags);
udc->gadget.ops = NULL;
udc->gadget.dev.driver = NULL;
}
/* free resources */
for (i = 0; i < hw_ep_max; i++) {
@ -2535,6 +2586,14 @@ static irqreturn_t udc_irq(void)
}
spin_lock(udc->lock);
if (udc->udc_driver->flags & CI13XXX_REGS_SHARED) {
if (hw_cread(CAP_USBMODE, USBMODE_CM) !=
USBMODE_CM_DEVICE) {
spin_unlock(udc->lock);
return IRQ_NONE;
}
}
intr = hw_test_and_clear_intr_active();
if (intr) {
isr_statistics.hndl.buf[isr_statistics.hndl.idx++] = intr;
@ -2593,14 +2652,16 @@ static void udc_release(struct device *dev)
* No interrupts active, the IRQ has not been requested yet
* Kernel assumes 32-bit DMA operations by default, no need to dma_set_mask
*/
static int udc_probe(struct device *dev, void __iomem *regs, const char *name)
static int udc_probe(struct ci13xxx_udc_driver *driver, struct device *dev,
void __iomem *regs)
{
struct ci13xxx *udc;
int retval = 0;
trace("%p, %p, %p", dev, regs, name);
if (dev == NULL || regs == NULL || name == NULL)
if (dev == NULL || regs == NULL || driver == NULL ||
driver->name == NULL)
return -EINVAL;
udc = kzalloc(sizeof(struct ci13xxx), GFP_KERNEL);
@ -2608,16 +2669,14 @@ static int udc_probe(struct device *dev, void __iomem *regs, const char *name)
return -ENOMEM;
udc->lock = &udc_lock;
udc->regs = regs;
udc->udc_driver = driver;
retval = hw_device_reset(regs);
if (retval)
goto done;
udc->gadget.ops = NULL;
udc->gadget.ops = &usb_gadget_ops;
udc->gadget.speed = USB_SPEED_UNKNOWN;
udc->gadget.is_dualspeed = 1;
udc->gadget.is_otg = 0;
udc->gadget.name = name;
udc->gadget.name = driver->name;
INIT_LIST_HEAD(&udc->gadget.ep_list);
udc->gadget.ep0 = NULL;
@ -2628,23 +2687,57 @@ static int udc_probe(struct device *dev, void __iomem *regs, const char *name)
udc->gadget.dev.parent = dev;
udc->gadget.dev.release = udc_release;
retval = device_register(&udc->gadget.dev);
retval = hw_device_init(regs);
if (retval < 0)
goto free_udc;
udc->transceiver = otg_get_transceiver();
if (udc->udc_driver->flags & CI13XXX_REQUIRE_TRANSCEIVER) {
if (udc->transceiver == NULL) {
retval = -ENODEV;
goto free_udc;
}
}
if (!(udc->udc_driver->flags & CI13XXX_REGS_SHARED)) {
retval = hw_device_reset(udc);
if (retval)
goto done;
goto put_transceiver;
}
retval = device_register(&udc->gadget.dev);
if (retval) {
put_device(&udc->gadget.dev);
goto put_transceiver;
}
#ifdef CONFIG_USB_GADGET_DEBUG_FILES
retval = dbg_create_files(&udc->gadget.dev);
#endif
if (retval) {
device_unregister(&udc->gadget.dev);
goto done;
if (retval)
goto unreg_device;
if (udc->transceiver) {
retval = otg_set_peripheral(udc->transceiver, &udc->gadget);
if (retval)
goto remove_dbg;
}
_udc = udc;
return retval;
done:
err("error = %i", retval);
remove_dbg:
#ifdef CONFIG_USB_GADGET_DEBUG_FILES
dbg_remove_files(&udc->gadget.dev);
#endif
unreg_device:
device_unregister(&udc->gadget.dev);
put_transceiver:
if (udc->transceiver)
otg_put_transceiver(udc->transceiver);
free_udc:
kfree(udc);
_udc = NULL;
return retval;
@ -2664,6 +2757,10 @@ static void udc_remove(void)
return;
}
if (udc->transceiver) {
otg_set_peripheral(udc->transceiver, &udc->gadget);
otg_put_transceiver(udc->transceiver);
}
#ifdef CONFIG_USB_GADGET_DEBUG_FILES
dbg_remove_files(&udc->gadget.dev);
#endif

19
drivers/usb/gadget/ci13xxx_udc.h
View File

@ -97,9 +97,24 @@ struct ci13xxx_ep {
struct dma_pool *td_pool;
};
struct ci13xxx;
struct ci13xxx_udc_driver {
const char *name;
unsigned long flags;
#define CI13XXX_REGS_SHARED BIT(0)
#define CI13XXX_REQUIRE_TRANSCEIVER BIT(1)
#define CI13XXX_PULLUP_ON_VBUS BIT(2)
#define CI13XXX_DISABLE_STREAMING BIT(3)
#define CI13XXX_CONTROLLER_RESET_EVENT 0
#define CI13XXX_CONTROLLER_STOPPED_EVENT 1
void (*notify_event) (struct ci13xxx *udc, unsigned event);
};
/* CI13XXX UDC descriptor & global resources */
struct ci13xxx {
spinlock_t *lock; /* ctrl register bank access */
void __iomem *regs; /* registers address space */
struct dma_pool *qh_pool; /* DMA pool for queue heads */
struct dma_pool *td_pool; /* DMA pool for transfer descs */
@ -108,6 +123,9 @@ struct ci13xxx {
struct ci13xxx_ep ci13xxx_ep[ENDPT_MAX]; /* extended endpts */
struct usb_gadget_driver *driver; /* 3rd party gadget driver */
struct ci13xxx_udc_driver *udc_driver; /* device controller driver */
int vbus_active; /* is VBUS active */
struct otg_transceiver *transceiver; /* Transceiver struct */
};
/******************************************************************************
@ -157,6 +175,7 @@ struct ci13xxx {
#define USBMODE_CM_DEVICE (0x02UL << 0)
#define USBMODE_CM_HOST (0x03UL << 0)
#define USBMODE_SLOM BIT(3)
#define USBMODE_SDIS BIT(4)
/* ENDPTCTRL */
#define ENDPTCTRL_RXS BIT(0)