#define __DRIVERS_USB_CHIPIDEA_CI_H
#include <linux/list.h>
+#include <linux/irqreturn.h>
#include <linux/usb/gadget.h>
/******************************************************************************
struct dma_pool *td_pool;
};
+enum ci_role {
+ CI_ROLE_HOST = 0,
+ CI_ROLE_GADGET,
+ CI_ROLE_END,
+};
+
+/**
+ * struct ci_role_driver - host/gadget role driver
+ * start: start this role
+ * stop: stop this role
+ * irq: irq handler for this role
+ * name: role name string (host/gadget)
+ */
+struct ci_role_driver {
+ int (*start)(struct ci13xxx *);
+ void (*stop)(struct ci13xxx *);
+ irqreturn_t (*irq)(struct ci13xxx *);
+ const char *name;
+};
+
struct hw_bank {
unsigned lpm; /* is LPM? */
void __iomem *abs; /* bus map offset */
struct ci13xxx_udc_driver *udc_driver; /* device controller driver */
int vbus_active; /* is VBUS active */
struct usb_phy *transceiver; /* Transceiver struct */
+ struct ci_role_driver *roles[CI_ROLE_END];
+ enum ci_role role;
+ bool is_otg;
+ struct work_struct work;
+ struct workqueue_struct *wq;
};
+static inline struct ci_role_driver *ci_role(struct ci13xxx *ci)
+{
+ BUG_ON(ci->role >= CI_ROLE_END || !ci->roles[ci->role]);
+ return ci->roles[ci->role];
+}
+
+static inline int ci_role_start(struct ci13xxx *ci, enum ci_role role)
+{
+ int ret;
+
+ if (role >= CI_ROLE_END)
+ return -EINVAL;
+
+ if (!ci->roles[role])
+ return -ENXIO;
+
+ ret = ci->roles[role]->start(ci);
+ if (!ret)
+ ci->role = role;
+ return ret;
+}
+
+static inline void ci_role_stop(struct ci13xxx *ci)
+{
+ enum ci_role role = ci->role;
+
+ if (role == CI_ROLE_END)
+ return;
+
+ ci->role = CI_ROLE_END;
+
+ ci->roles[role]->stop(ci);
+}
+
/******************************************************************************
* REGISTERS
*****************************************************************************/
OP_ENDPTLISTADDR,
OP_PORTSC,
OP_DEVLC,
+ OP_OTGSC,
OP_USBMODE,
OP_ENDPTSETUPSTAT,
OP_ENDPTPRIME,
OP_LAST = OP_ENDPTCTRL + ENDPT_MAX / 2,
};
-
/**
* ffs_nr: find first (least significant) bit set
* @x: the word to search
return (val & mask) >> ffs_nr(mask);
}
-int hw_device_init(struct ci13xxx *udc, void __iomem *base,
- uintptr_t cap_offset);
int hw_device_reset(struct ci13xxx *ci);
int hw_port_test_set(struct ci13xxx *ci, u8 mode);
/* MSM specific */
#define ABS_AHBBURST (0x0090UL)
#define ABS_AHBMODE (0x0098UL)
-/* UDC register map */
+/* Controller register map */
static uintptr_t ci_regs_nolpm[] = {
[CAP_CAPLENGTH] = 0x000UL,
[CAP_HCCPARAMS] = 0x008UL,
[OP_ENDPTLISTADDR] = 0x018UL,
[OP_PORTSC] = 0x044UL,
[OP_DEVLC] = 0x084UL,
+ [OP_OTGSC] = 0x064UL,
[OP_USBMODE] = 0x068UL,
[OP_ENDPTSETUPSTAT] = 0x06CUL,
[OP_ENDPTPRIME] = 0x070UL,
[OP_ENDPTLISTADDR] = 0x018UL,
[OP_PORTSC] = 0x044UL,
[OP_DEVLC] = 0x084UL,
+ [OP_OTGSC] = 0x0C4UL,
[OP_USBMODE] = 0x0C8UL,
[OP_ENDPTSETUPSTAT] = 0x0D8UL,
[OP_ENDPTPRIME] = 0x0DCUL,
[OP_ENDPTCTRL] = 0x0ECUL,
};
-static int hw_alloc_regmap(struct ci13xxx *udc, bool is_lpm)
+static int hw_alloc_regmap(struct ci13xxx *ci, bool is_lpm)
{
int i;
- kfree(udc->hw_bank.regmap);
+ kfree(ci->hw_bank.regmap);
- udc->hw_bank.regmap = kzalloc((OP_LAST + 1) * sizeof(void *),
- GFP_KERNEL);
- if (!udc->hw_bank.regmap)
+ ci->hw_bank.regmap = kzalloc((OP_LAST + 1) * sizeof(void *),
+ GFP_KERNEL);
+ if (!ci->hw_bank.regmap)
return -ENOMEM;
for (i = 0; i < OP_ENDPTCTRL; i++)
- udc->hw_bank.regmap[i] =
- (i <= CAP_LAST ? udc->hw_bank.cap : udc->hw_bank.op) +
+ ci->hw_bank.regmap[i] =
+ (i <= CAP_LAST ? ci->hw_bank.cap : ci->hw_bank.op) +
(is_lpm ? ci_regs_lpm[i] : ci_regs_nolpm[i]);
for (; i <= OP_LAST; i++)
- udc->hw_bank.regmap[i] = udc->hw_bank.op +
+ ci->hw_bank.regmap[i] = ci->hw_bank.op +
4 * (i - OP_ENDPTCTRL) +
(is_lpm
? ci_regs_lpm[OP_ENDPTCTRL]
return hw_read(ci, OP_PORTSC, PORTSC_PTC) >> ffs_nr(PORTSC_PTC);
}
-int hw_device_init(struct ci13xxx *udc, void __iomem *base,
- uintptr_t cap_offset)
+static int hw_device_init(struct ci13xxx *ci, void __iomem *base)
{
u32 reg;
/* bank is a module variable */
- udc->hw_bank.abs = base;
+ ci->hw_bank.abs = base;
- udc->hw_bank.cap = udc->hw_bank.abs;
- udc->hw_bank.cap += cap_offset;
- udc->hw_bank.op = udc->hw_bank.cap + ioread8(udc->hw_bank.cap);
+ ci->hw_bank.cap = ci->hw_bank.abs;
+ ci->hw_bank.cap += ci->udc_driver->capoffset;
+ ci->hw_bank.op = ci->hw_bank.cap + ioread8(ci->hw_bank.cap);
- hw_alloc_regmap(udc, false);
- reg = hw_read(udc, CAP_HCCPARAMS, HCCPARAMS_LEN) >>
+ hw_alloc_regmap(ci, false);
+ reg = hw_read(ci, CAP_HCCPARAMS, HCCPARAMS_LEN) >>
ffs_nr(HCCPARAMS_LEN);
- udc->hw_bank.lpm = reg;
- hw_alloc_regmap(udc, !!reg);
- udc->hw_bank.size = udc->hw_bank.op - udc->hw_bank.abs;
- udc->hw_bank.size += OP_LAST;
- udc->hw_bank.size /= sizeof(u32);
+ ci->hw_bank.lpm = reg;
+ hw_alloc_regmap(ci, !!reg);
+ ci->hw_bank.size = ci->hw_bank.op - ci->hw_bank.abs;
+ ci->hw_bank.size += OP_LAST;
+ ci->hw_bank.size /= sizeof(u32);
- reg = hw_read(udc, CAP_DCCPARAMS, DCCPARAMS_DEN) >>
+ reg = hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DEN) >>
ffs_nr(DCCPARAMS_DEN);
- udc->hw_ep_max = reg * 2; /* cache hw ENDPT_MAX */
+ ci->hw_ep_max = reg * 2; /* cache hw ENDPT_MAX */
- if (udc->hw_ep_max == 0 || udc->hw_ep_max > ENDPT_MAX)
+ if (ci->hw_ep_max == 0 || ci->hw_ep_max > ENDPT_MAX)
return -ENODEV;
- dev_dbg(udc->dev, "ChipIdea UDC found, lpm: %d; cap: %p op: %p\n",
- udc->hw_bank.lpm, udc->hw_bank.cap, udc->hw_bank.op);
+ dev_dbg(ci->dev, "ChipIdea HDRC found, lpm: %d; cap: %p op: %p\n",
+ ci->hw_bank.lpm, ci->hw_bank.cap, ci->hw_bank.op);
/* setup lock mode ? */
return 0;
}
-static int __devinit ci_udc_probe(struct platform_device *pdev)
+/**
+ * ci_otg_role - pick role based on ID pin state
+ * @ci: the controller
+ */
+static enum ci_role ci_otg_role(struct ci13xxx *ci)
+{
+ u32 sts = hw_read(ci, OP_OTGSC, ~0);
+ enum ci_role role = sts & OTGSC_ID
+ ? CI_ROLE_GADGET
+ : CI_ROLE_HOST;
+
+ return role;
+}
+
+/**
+ * ci_role_work - perform role changing based on ID pin
+ * @work: work struct
+ */
+static void ci_role_work(struct work_struct *work)
+{
+ struct ci13xxx *ci = container_of(work, struct ci13xxx, work);
+ enum ci_role role = ci_otg_role(ci);
+
+ hw_write(ci, OP_OTGSC, OTGSC_IDIS, OTGSC_IDIS);
+
+ if (role != ci->role) {
+ dev_dbg(ci->dev, "switching from %s to %s\n",
+ ci_role(ci)->name, ci->roles[role]->name);
+
+ ci_role_stop(ci);
+ ci_role_start(ci, role);
+ }
+}
+
+static ssize_t show_role(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct ci13xxx *ci = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%s\n", ci_role(ci)->name);
+}
+
+static ssize_t store_role(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct ci13xxx *ci = dev_get_drvdata(dev);
+ enum ci_role role;
+ int ret;
+
+ for (role = CI_ROLE_HOST; role < CI_ROLE_END; role++)
+ if (ci->roles[role] && !strcmp(buf, ci->roles[role]->name))
+ break;
+
+ if (role == CI_ROLE_END || role == ci->role)
+ return -EINVAL;
+
+ ci_role_stop(ci);
+ ret = ci_role_start(ci, role);
+ if (ret)
+ return ret;
+
+ return count;
+}
+
+static DEVICE_ATTR(role, S_IRUSR | S_IWUSR, show_role, store_role);
+
+static irqreturn_t ci_irq(int irq, void *data)
+{
+ struct ci13xxx *ci = data;
+ irqreturn_t ret = IRQ_NONE;
+
+ if (ci->is_otg) {
+ u32 sts = hw_read(ci, OP_OTGSC, ~0);
+
+ if (sts & OTGSC_IDIS) {
+ queue_work(ci->wq, &ci->work);
+ ret = IRQ_HANDLED;
+ }
+ }
+
+ return ci->role == CI_ROLE_END ? ret : ci_role(ci)->irq(ci);
+}
+
+static int __devinit ci_hdrc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
- struct ci13xxx_udc_driver *driver = dev->platform_data;
- struct ci13xxx *udc;
+ struct ci13xxx *ci;
struct resource *res;
void __iomem *base;
int ret;
- if (!driver) {
+ if (!dev->platform_data) {
dev_err(dev, "platform data missing\n");
return -ENODEV;
}
return -ENOMEM;
}
- ret = udc_probe(driver, dev, base, &udc);
- if (ret)
- return ret;
+ ci = devm_kzalloc(dev, sizeof(*ci), GFP_KERNEL);
+ if (!ci) {
+ dev_err(dev, "can't allocate device\n");
+ return -ENOMEM;
+ }
+
+ ci->dev = dev;
+ ci->udc_driver = dev->platform_data;
+
+ ret = hw_device_init(ci, base);
+ if (ret < 0) {
+ dev_err(dev, "can't initialize hardware\n");
+ return -ENODEV;
+ }
- udc->irq = platform_get_irq(pdev, 0);
- if (udc->irq < 0) {
+ ci->irq = platform_get_irq(pdev, 0);
+ if (ci->irq < 0) {
dev_err(dev, "missing IRQ\n");
+ return -ENODEV;
+ }
+
+ INIT_WORK(&ci->work, ci_role_work);
+ ci->wq = create_singlethread_workqueue("ci_otg");
+ if (!ci->wq) {
+ dev_err(dev, "can't create workqueue\n");
+ return -ENODEV;
+ }
+
+ /* initialize role(s) before the interrupt is requested */
+ ret = ci_hdrc_gadget_init(ci);
+ if (ret)
+ dev_info(dev, "doesn't support gadget\n");
+
+ if (!ci->roles[CI_ROLE_HOST] && !ci->roles[CI_ROLE_GADGET]) {
+ dev_err(dev, "no supported roles\n");
+ ret = -ENODEV;
+ goto rm_wq;
+ }
+
+ if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET]) {
+ ci->is_otg = true;
+ ci->role = ci_otg_role(ci);
+ } else {
+ ci->role = ci->roles[CI_ROLE_HOST]
+ ? CI_ROLE_HOST
+ : CI_ROLE_GADGET;
+ }
+
+ ret = ci_role_start(ci, ci->role);
+ if (ret) {
+ dev_err(dev, "can't start %s role\n", ci_role(ci)->name);
ret = -ENODEV;
- goto out;
+ goto rm_wq;
}
- platform_set_drvdata(pdev, udc);
- ret = request_irq(udc->irq, udc_irq, IRQF_SHARED, driver->name, udc);
+ platform_set_drvdata(pdev, ci);
+ ret = request_irq(ci->irq, ci_irq, IRQF_SHARED, ci->udc_driver->name,
+ ci);
+ if (ret)
+ goto stop;
-out:
+ ret = device_create_file(dev, &dev_attr_role);
if (ret)
- udc_remove(udc);
+ goto rm_attr;
+
+ if (ci->is_otg)
+ hw_write(ci, OP_OTGSC, OTGSC_IDIE, OTGSC_IDIE);
+
+ return ret;
+
+rm_attr:
+ device_remove_file(dev, &dev_attr_role);
+stop:
+ ci_role_stop(ci);
+rm_wq:
+ flush_workqueue(ci->wq);
+ destroy_workqueue(ci->wq);
return ret;
}
-static int __devexit ci_udc_remove(struct platform_device *pdev)
+static int __devexit ci_hdrc_remove(struct platform_device *pdev)
{
- struct ci13xxx *udc = platform_get_drvdata(pdev);
+ struct ci13xxx *ci = platform_get_drvdata(pdev);
- free_irq(udc->irq, udc);
- udc_remove(udc);
+ flush_workqueue(ci->wq);
+ destroy_workqueue(ci->wq);
+ device_remove_file(ci->dev, &dev_attr_role);
+ free_irq(ci->irq, ci);
+ ci_role_stop(ci);
return 0;
}
-static struct platform_driver ci_udc_driver = {
- .probe = ci_udc_probe,
- .remove = __devexit_p(ci_udc_remove),
+static struct platform_driver ci_hdrc_driver = {
+ .probe = ci_hdrc_probe,
+ .remove = __devexit_p(ci_hdrc_remove),
.driver = {
- .name = "ci_udc",
+ .name = "ci_hdrc",
},
};
-module_platform_driver(ci_udc_driver);
+module_platform_driver(ci_hdrc_driver);
-MODULE_ALIAS("platform:ci_udc");
+MODULE_ALIAS("platform:ci_hdrc");
MODULE_ALIAS("platform:ci13xxx");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("David Lopo <dlopo@chipidea.mips.com>");
-MODULE_DESCRIPTION("ChipIdea UDC Driver");
+MODULE_DESCRIPTION("ChipIdea HDRC Driver");
* BUS block
*****************************************************************************/
/**
- * udc_irq: global interrupt handler
+ * udc_irq: udc interrupt handler
*
* This function returns IRQ_HANDLED if the IRQ has been handled
* It locks access to registers
*/
-irqreturn_t udc_irq(int irq, void *data)
+static irqreturn_t udc_irq(struct ci13xxx *udc)
{
- struct ci13xxx *udc = data;
irqreturn_t retval;
u32 intr;
}
/**
- * udc_probe: parent probe must call this to initialize UDC
- * @dev: parent device
- * @regs: registers base address
- * @name: driver name
- *
- * This function returns an error code
- * No interrupts active, the IRQ has not been requested yet
- * Kernel assumes 32-bit DMA operations by default, no need to dma_set_mask
+ * udc_start: initialize gadget role
+ * @udc: chipidea controller
*/
-int udc_probe(struct ci13xxx_udc_driver *driver, struct device *dev,
- void __iomem *regs, struct ci13xxx **_udc)
+static int udc_start(struct ci13xxx *udc)
{
- struct ci13xxx *udc;
+ struct device *dev = udc->dev;
int retval = 0;
- if (dev == NULL || regs == NULL || driver == NULL ||
- driver->name == NULL)
+ if (!udc)
return -EINVAL;
- udc = kzalloc(sizeof(struct ci13xxx), GFP_KERNEL);
- if (udc == NULL)
- return -ENOMEM;
-
spin_lock_init(&udc->lock);
- udc->regs = regs;
- udc->udc_driver = driver;
udc->gadget.ops = &usb_gadget_ops;
udc->gadget.speed = USB_SPEED_UNKNOWN;
udc->gadget.max_speed = USB_SPEED_HIGH;
udc->gadget.is_otg = 0;
- udc->gadget.name = driver->name;
+ udc->gadget.name = udc->udc_driver->name;
INIT_LIST_HEAD(&udc->gadget.ep_list);
udc->gadget.dev.parent = dev;
udc->gadget.dev.release = udc_release;
- udc->dev = dev;
-
/* alloc resources */
udc->qh_pool = dma_pool_create("ci13xxx_qh", dev,
sizeof(struct ci13xxx_qh),
64, CI13XXX_PAGE_SIZE);
- if (udc->qh_pool == NULL) {
- retval = -ENOMEM;
- goto free_udc;
- }
+ if (udc->qh_pool == NULL)
+ return -ENOMEM;
udc->td_pool = dma_pool_create("ci13xxx_td", dev,
sizeof(struct ci13xxx_td),
goto free_qh_pool;
}
- retval = hw_device_init(udc, regs, driver->capoffset);
- if (retval < 0)
- goto free_pools;
-
retval = init_eps(udc);
if (retval)
goto free_pools;
pm_runtime_no_callbacks(&udc->gadget.dev);
pm_runtime_enable(&udc->gadget.dev);
- *_udc = udc;
return retval;
remove_trans:
dma_pool_destroy(udc->td_pool);
free_qh_pool:
dma_pool_destroy(udc->qh_pool);
-free_udc:
- kfree(udc);
- *_udc = NULL;
return retval;
}
*
* No interrupts active, the IRQ has been released
*/
-void udc_remove(struct ci13xxx *udc)
+static void udc_stop(struct ci13xxx *udc)
{
int i;
dma_pool_destroy(udc->qh_pool);
if (udc->transceiver) {
- otg_set_peripheral(udc->transceiver->otg, &udc->gadget);
+ otg_set_peripheral(udc->transceiver->otg, NULL);
usb_put_transceiver(udc->transceiver);
}
dbg_remove_files(&udc->gadget.dev);
device_unregister(&udc->gadget.dev);
+ /* my kobject is dynamic, I swear! */
+ memset(&udc->gadget, 0, sizeof(udc->gadget));
+}
+
+/**
+ * ci_hdrc_gadget_init - initialize device related bits
+ * ci: the controller
+ *
+ * This function enables the gadget role, if the device is "device capable".
+ */
+int ci_hdrc_gadget_init(struct ci13xxx *ci)
+{
+ struct ci_role_driver *rdrv;
+
+ if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
+ return -ENXIO;
+
+ rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
+ if (!rdrv)
+ return -ENOMEM;
+
+ rdrv->start = udc_start;
+ rdrv->stop = udc_stop;
+ rdrv->irq = udc_irq;
+ rdrv->name = "gadget";
+ ci->roles[CI_ROLE_GADGET] = rdrv;
- kfree(udc->hw_bank.regmap);
- kfree(udc);
+ return 0;
}
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