diff options
Diffstat (limited to 'drivers/usb/gadget/pch_udc.c')
| -rw-r--r-- | drivers/usb/gadget/pch_udc.c | 323 |
1 files changed, 312 insertions, 11 deletions
diff --git a/drivers/usb/gadget/pch_udc.c b/drivers/usb/gadget/pch_udc.c index a3fcaae4bc2a..65307064a6fd 100644 --- a/drivers/usb/gadget/pch_udc.c +++ b/drivers/usb/gadget/pch_udc.c @@ -15,6 +15,14 @@ #include <linux/interrupt.h> #include <linux/usb/ch9.h> #include <linux/usb/gadget.h> +#include <linux/gpio.h> +#include <linux/irq.h> + +/* GPIO port for VBUS detecting */ +static int vbus_gpio_port = -1; /* GPIO port number (-1:Not used) */ + +#define PCH_VBUS_PERIOD 3000 /* VBUS polling period (msec) */ +#define PCH_VBUS_INTERVAL 10 /* VBUS polling interval (msec) */ /* Address offset of Registers */ #define UDC_EP_REG_SHIFT 0x20 /* Offset to next EP */ @@ -296,6 +304,21 @@ struct pch_udc_ep { }; /** + * struct pch_vbus_gpio_data - Structure holding GPIO informaton + * for detecting VBUS + * @port: gpio port number + * @intr: gpio interrupt number + * @irq_work_fall Structure for WorkQueue + * @irq_work_rise Structure for WorkQueue + */ +struct pch_vbus_gpio_data { + int port; + int intr; + struct work_struct irq_work_fall; + struct work_struct irq_work_rise; +}; + +/** * struct pch_udc_dev - Structure holding complete information * of the PCH USB device * @gadget: gadget driver data @@ -311,6 +334,7 @@ struct pch_udc_ep { * @registered: driver regsitered with system * @suspended: driver in suspended state * @connected: gadget driver associated + * @vbus_session: required vbus_session state * @set_cfg_not_acked: pending acknowledgement 4 setup * @waiting_zlp_ack: pending acknowledgement 4 ZLP * @data_requests: DMA pool for data requests @@ -322,6 +346,7 @@ struct pch_udc_ep { * @base_addr: for mapped device memory * @irq: IRQ line for the device * @cfg_data: current cfg, intf, and alt in use + * @vbus_gpio: GPIO informaton for detecting VBUS */ struct pch_udc_dev { struct usb_gadget gadget; @@ -337,6 +362,7 @@ struct pch_udc_dev { registered:1, suspended:1, connected:1, + vbus_session:1, set_cfg_not_acked:1, waiting_zlp_ack:1; struct pci_pool *data_requests; @@ -347,7 +373,8 @@ struct pch_udc_dev { unsigned long phys_addr; void __iomem *base_addr; unsigned irq; - struct pch_udc_cfg_data cfg_data; + struct pch_udc_cfg_data cfg_data; + struct pch_vbus_gpio_data vbus_gpio; }; #define PCH_UDC_PCI_BAR 1 @@ -554,6 +581,29 @@ static void pch_udc_clear_disconnect(struct pch_udc_dev *dev) } /** + * pch_udc_reconnect() - This API initializes usb device controller, + * and clear the disconnect status. + * @dev: Reference to pch_udc_regs structure + */ +static void pch_udc_init(struct pch_udc_dev *dev); +static void pch_udc_reconnect(struct pch_udc_dev *dev) +{ + pch_udc_init(dev); + + /* enable device interrupts */ + /* pch_udc_enable_interrupts() */ + pch_udc_bit_clr(dev, UDC_DEVIRQMSK_ADDR, + UDC_DEVINT_UR | UDC_DEVINT_ENUM); + + /* Clear the disconnect */ + pch_udc_bit_set(dev, UDC_DEVCTL_ADDR, UDC_DEVCTL_RES); + pch_udc_bit_clr(dev, UDC_DEVCTL_ADDR, UDC_DEVCTL_SD); + mdelay(1); + /* Resume USB signalling */ + pch_udc_bit_clr(dev, UDC_DEVCTL_ADDR, UDC_DEVCTL_RES); +} + +/** * pch_udc_vbus_session() - set or clearr the disconnect status. * @dev: Reference to pch_udc_regs structure * @is_active: Parameter specifying the action @@ -563,10 +613,18 @@ static void pch_udc_clear_disconnect(struct pch_udc_dev *dev) static inline void pch_udc_vbus_session(struct pch_udc_dev *dev, int is_active) { - if (is_active) - pch_udc_clear_disconnect(dev); - else + if (is_active) { + pch_udc_reconnect(dev); + dev->vbus_session = 1; + } else { + if (dev->driver && dev->driver->disconnect) { + spin_unlock(&dev->lock); + dev->driver->disconnect(&dev->gadget); + spin_lock(&dev->lock); + } pch_udc_set_disconnect(dev); + dev->vbus_session = 0; + } } /** @@ -1126,7 +1184,17 @@ static int pch_udc_pcd_pullup(struct usb_gadget *gadget, int is_on) if (!gadget) return -EINVAL; dev = container_of(gadget, struct pch_udc_dev, gadget); - pch_udc_vbus_session(dev, is_on); + if (is_on) { + pch_udc_reconnect(dev); + } else { + if (dev->driver && dev->driver->disconnect) { + spin_unlock(&dev->lock); + dev->driver->disconnect(&dev->gadget); + spin_lock(&dev->lock); + } + pch_udc_set_disconnect(dev); + } + return 0; } @@ -1183,6 +1251,188 @@ static const struct usb_gadget_ops pch_udc_ops = { }; /** + * pch_vbus_gpio_get_value() - This API gets value of GPIO port as VBUS status. + * @dev: Reference to the driver structure + * + * Return value: + * 1: VBUS is high + * 0: VBUS is low + * -1: It is not enable to detect VBUS using GPIO + */ +static int pch_vbus_gpio_get_value(struct pch_udc_dev *dev) +{ + int vbus = 0; + + if (dev->vbus_gpio.port) + vbus = gpio_get_value(dev->vbus_gpio.port) ? 1 : 0; + else + vbus = -1; + + return vbus; +} + +/** + * pch_vbus_gpio_work_fall() - This API keeps watch on VBUS becoming Low. + * If VBUS is Low, disconnect is processed + * @irq_work: Structure for WorkQueue + * + */ +static void pch_vbus_gpio_work_fall(struct work_struct *irq_work) +{ + struct pch_vbus_gpio_data *vbus_gpio = container_of(irq_work, + struct pch_vbus_gpio_data, irq_work_fall); + struct pch_udc_dev *dev = + container_of(vbus_gpio, struct pch_udc_dev, vbus_gpio); + int vbus_saved = -1; + int vbus; + int count; + + if (!dev->vbus_gpio.port) + return; + + for (count = 0; count < (PCH_VBUS_PERIOD / PCH_VBUS_INTERVAL); + count++) { + vbus = pch_vbus_gpio_get_value(dev); + + if ((vbus_saved == vbus) && (vbus == 0)) { + dev_dbg(&dev->pdev->dev, "VBUS fell"); + if (dev->driver + && dev->driver->disconnect) { + dev->driver->disconnect( + &dev->gadget); + } + if (dev->vbus_gpio.intr) + pch_udc_init(dev); + else + pch_udc_reconnect(dev); + return; + } + vbus_saved = vbus; + mdelay(PCH_VBUS_INTERVAL); + } +} + +/** + * pch_vbus_gpio_work_rise() - This API checks VBUS is High. + * If VBUS is High, connect is processed + * @irq_work: Structure for WorkQueue + * + */ +static void pch_vbus_gpio_work_rise(struct work_struct *irq_work) +{ + struct pch_vbus_gpio_data *vbus_gpio = container_of(irq_work, + struct pch_vbus_gpio_data, irq_work_rise); + struct pch_udc_dev *dev = + container_of(vbus_gpio, struct pch_udc_dev, vbus_gpio); + int vbus; + + if (!dev->vbus_gpio.port) + return; + + mdelay(PCH_VBUS_INTERVAL); + vbus = pch_vbus_gpio_get_value(dev); + + if (vbus == 1) { + dev_dbg(&dev->pdev->dev, "VBUS rose"); + pch_udc_reconnect(dev); + return; + } +} + +/** + * pch_vbus_gpio_irq() - IRQ handler for GPIO intrerrupt for changing VBUS + * @irq: Interrupt request number + * @dev: Reference to the device structure + * + * Return codes: + * 0: Success + * -EINVAL: GPIO port is invalid or can't be initialized. + */ +static irqreturn_t pch_vbus_gpio_irq(int irq, void *data) +{ + struct pch_udc_dev *dev = (struct pch_udc_dev *)data; + + if (!dev->vbus_gpio.port || !dev->vbus_gpio.intr) + return IRQ_NONE; + + if (pch_vbus_gpio_get_value(dev)) + schedule_work(&dev->vbus_gpio.irq_work_rise); + else + schedule_work(&dev->vbus_gpio.irq_work_fall); + + return IRQ_HANDLED; +} + +/** + * pch_vbus_gpio_init() - This API initializes GPIO port detecting VBUS. + * @dev: Reference to the driver structure + * @vbus_gpio Number of GPIO port to detect gpio + * + * Return codes: + * 0: Success + * -EINVAL: GPIO port is invalid or can't be initialized. + */ +static int pch_vbus_gpio_init(struct pch_udc_dev *dev, int vbus_gpio_port) +{ + int err; + int irq_num = 0; + + dev->vbus_gpio.port = 0; + dev->vbus_gpio.intr = 0; + + if (vbus_gpio_port <= -1) + return -EINVAL; + + err = gpio_is_valid(vbus_gpio_port); + if (!err) { + pr_err("%s: gpio port %d is invalid\n", + __func__, vbus_gpio_port); + return -EINVAL; + } + + err = gpio_request(vbus_gpio_port, "pch_vbus"); + if (err) { + pr_err("%s: can't request gpio port %d, err: %d\n", + __func__, vbus_gpio_port, err); + return -EINVAL; + } + + dev->vbus_gpio.port = vbus_gpio_port; + gpio_direction_input(vbus_gpio_port); + INIT_WORK(&dev->vbus_gpio.irq_work_fall, pch_vbus_gpio_work_fall); + + irq_num = gpio_to_irq(vbus_gpio_port); + if (irq_num > 0) { + irq_set_irq_type(irq_num, IRQ_TYPE_EDGE_BOTH); + err = request_irq(irq_num, pch_vbus_gpio_irq, 0, + "vbus_detect", dev); + if (!err) { + dev->vbus_gpio.intr = irq_num; + INIT_WORK(&dev->vbus_gpio.irq_work_rise, + pch_vbus_gpio_work_rise); + } else { + pr_err("%s: can't request irq %d, err: %d\n", + __func__, irq_num, err); + } + } + + return 0; +} + +/** + * pch_vbus_gpio_free() - This API frees resources of GPIO port + * @dev: Reference to the driver structure + */ +static void pch_vbus_gpio_free(struct pch_udc_dev *dev) +{ + if (dev->vbus_gpio.intr) + free_irq(dev->vbus_gpio.intr, dev); + + if (dev->vbus_gpio.port) + gpio_free(dev->vbus_gpio.port); +} + +/** * complete_req() - This API is invoked from the driver when processing * of a request is complete * @ep: Reference to the endpoint structure @@ -1493,6 +1743,7 @@ static int pch_udc_pcd_ep_disable(struct usb_ep *usbep) pch_udc_ep_disable(ep); pch_udc_disable_ep_interrupts(ep->dev, PCH_UDC_EPINT(ep->in, ep->num)); ep->desc = NULL; + ep->ep.desc = NULL; INIT_LIST_HEAD(&ep->queue); spin_unlock_irqrestore(&ep->dev->lock, iflags); return 0; @@ -2335,8 +2586,11 @@ static void pch_udc_svc_ur_interrupt(struct pch_udc_dev *dev) /* Complete request queue */ empty_req_queue(ep); } - if (dev->driver && dev->driver->disconnect) + if (dev->driver && dev->driver->disconnect) { + spin_unlock(&dev->lock); dev->driver->disconnect(&dev->gadget); + spin_lock(&dev->lock); + } } /** @@ -2371,6 +2625,11 @@ static void pch_udc_svc_enum_interrupt(struct pch_udc_dev *dev) pch_udc_set_dma(dev, DMA_DIR_TX); pch_udc_set_dma(dev, DMA_DIR_RX); pch_udc_ep_set_rrdy(&(dev->ep[UDC_EP0OUT_IDX])); + + /* enable device interrupts */ + pch_udc_enable_interrupts(dev, UDC_DEVINT_UR | UDC_DEVINT_US | + UDC_DEVINT_ES | UDC_DEVINT_ENUM | + UDC_DEVINT_SI | UDC_DEVINT_SC); } /** @@ -2459,12 +2718,18 @@ static void pch_udc_svc_cfg_interrupt(struct pch_udc_dev *dev) */ static void pch_udc_dev_isr(struct pch_udc_dev *dev, u32 dev_intr) { + int vbus; + /* USB Reset Interrupt */ - if (dev_intr & UDC_DEVINT_UR) + if (dev_intr & UDC_DEVINT_UR) { pch_udc_svc_ur_interrupt(dev); + dev_dbg(&dev->pdev->dev, "USB_RESET\n"); + } /* Enumeration Done Interrupt */ - if (dev_intr & UDC_DEVINT_ENUM) + if (dev_intr & UDC_DEVINT_ENUM) { pch_udc_svc_enum_interrupt(dev); + dev_dbg(&dev->pdev->dev, "USB_ENUM\n"); + } /* Set Interface Interrupt */ if (dev_intr & UDC_DEVINT_SI) pch_udc_svc_intf_interrupt(dev); @@ -2472,8 +2737,30 @@ static void pch_udc_dev_isr(struct pch_udc_dev *dev, u32 dev_intr) if (dev_intr & UDC_DEVINT_SC) pch_udc_svc_cfg_interrupt(dev); /* USB Suspend interrupt */ - if (dev_intr & UDC_DEVINT_US) + if (dev_intr & UDC_DEVINT_US) { + if (dev->driver + && dev->driver->suspend) { + spin_unlock(&dev->lock); + dev->driver->suspend(&dev->gadget); + spin_lock(&dev->lock); + } + + vbus = pch_vbus_gpio_get_value(dev); + if ((dev->vbus_session == 0) + && (vbus != 1)) { + if (dev->driver && dev->driver->disconnect) { + spin_unlock(&dev->lock); + dev->driver->disconnect(&dev->gadget); + spin_lock(&dev->lock); + } + pch_udc_reconnect(dev); + } else if ((dev->vbus_session == 0) + && (vbus == 1) + && !dev->vbus_gpio.intr) + schedule_work(&dev->vbus_gpio.irq_work_fall); + dev_dbg(&dev->pdev->dev, "USB_SUSPEND\n"); + } /* Clear the SOF interrupt, if enabled */ if (dev_intr & UDC_DEVINT_SOF) dev_dbg(&dev->pdev->dev, "SOF\n"); @@ -2499,6 +2786,14 @@ static irqreturn_t pch_udc_isr(int irq, void *pdev) dev_intr = pch_udc_read_device_interrupts(dev); ep_intr = pch_udc_read_ep_interrupts(dev); + /* For a hot plug, this find that the controller is hung up. */ + if (dev_intr == ep_intr) + if (dev_intr == pch_udc_readl(dev, UDC_DEVCFG_ADDR)) { + dev_dbg(&dev->pdev->dev, "UDC: Hung up\n"); + /* The controller is reset */ + pch_udc_writel(dev, UDC_SRST, UDC_SRST_ADDR); + return IRQ_HANDLED; + } if (dev_intr) /* Clear device interrupts */ pch_udc_write_device_interrupts(dev, dev_intr); @@ -2625,6 +2920,7 @@ static int pch_udc_pcd_init(struct pch_udc_dev *dev) { pch_udc_init(dev); pch_udc_pcd_reinit(dev); + pch_vbus_gpio_init(dev, vbus_gpio_port); return 0; } @@ -2725,7 +3021,8 @@ static int pch_udc_start(struct usb_gadget_driver *driver, pch_udc_setup_ep0(dev); /* clear SD */ - pch_udc_clear_disconnect(dev); + if ((pch_vbus_gpio_get_value(dev) != 0) || !dev->vbus_gpio.intr) + pch_udc_clear_disconnect(dev); dev->connected = 1; return 0; @@ -2803,6 +3100,8 @@ static void pch_udc_remove(struct pci_dev *pdev) UDC_EP0OUT_BUFF_SIZE * 4, DMA_FROM_DEVICE); kfree(dev->ep0out_buf); + pch_vbus_gpio_free(dev); + pch_udc_exit(dev); if (dev->irq_registered) @@ -2912,8 +3211,10 @@ static int pch_udc_probe(struct pci_dev *pdev, } pch_udc = dev; /* initialize the hardware */ - if (pch_udc_pcd_init(dev)) + if (pch_udc_pcd_init(dev)) { + retval = -ENODEV; goto finished; + } if (request_irq(pdev->irq, pch_udc_isr, IRQF_SHARED, KBUILD_MODNAME, dev)) { dev_err(&pdev->dev, "%s: request_irq(%d) fail\n", __func__, |