diff options
Diffstat (limited to 'drivers/usb/gadget/udc/s3c-hsudc.c')
| -rw-r--r-- | drivers/usb/gadget/udc/s3c-hsudc.c | 1318 |
1 files changed, 1318 insertions, 0 deletions
diff --git a/drivers/usb/gadget/udc/s3c-hsudc.c b/drivers/usb/gadget/udc/s3c-hsudc.c new file mode 100644 index 000000000..7bd5182ce --- /dev/null +++ b/drivers/usb/gadget/udc/s3c-hsudc.c @@ -0,0 +1,1318 @@ +// SPDX-License-Identifier: GPL-2.0 +/* linux/drivers/usb/gadget/s3c-hsudc.c + * + * Copyright (c) 2010 Samsung Electronics Co., Ltd. + * http://www.samsung.com/ + * + * S3C24XX USB 2.0 High-speed USB controller gadget driver + * + * The S3C24XX USB 2.0 high-speed USB controller supports upto 9 endpoints. + * Each endpoint can be configured as either in or out endpoint. Endpoints + * can be configured for Bulk or Interrupt transfer mode. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/spinlock.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/dma-mapping.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/usb/ch9.h> +#include <linux/usb/gadget.h> +#include <linux/usb/otg.h> +#include <linux/prefetch.h> +#include <linux/platform_data/s3c-hsudc.h> +#include <linux/regulator/consumer.h> +#include <linux/pm_runtime.h> + +#define S3C_HSUDC_REG(x) (x) + +/* Non-Indexed Registers */ +#define S3C_IR S3C_HSUDC_REG(0x00) /* Index Register */ +#define S3C_EIR S3C_HSUDC_REG(0x04) /* EP Intr Status */ +#define S3C_EIR_EP0 (1<<0) +#define S3C_EIER S3C_HSUDC_REG(0x08) /* EP Intr Enable */ +#define S3C_FAR S3C_HSUDC_REG(0x0c) /* Gadget Address */ +#define S3C_FNR S3C_HSUDC_REG(0x10) /* Frame Number */ +#define S3C_EDR S3C_HSUDC_REG(0x14) /* EP Direction */ +#define S3C_TR S3C_HSUDC_REG(0x18) /* Test Register */ +#define S3C_SSR S3C_HSUDC_REG(0x1c) /* System Status */ +#define S3C_SSR_DTZIEN_EN (0xff8f) +#define S3C_SSR_ERR (0xff80) +#define S3C_SSR_VBUSON (1 << 8) +#define S3C_SSR_HSP (1 << 4) +#define S3C_SSR_SDE (1 << 3) +#define S3C_SSR_RESUME (1 << 2) +#define S3C_SSR_SUSPEND (1 << 1) +#define S3C_SSR_RESET (1 << 0) +#define S3C_SCR S3C_HSUDC_REG(0x20) /* System Control */ +#define S3C_SCR_DTZIEN_EN (1 << 14) +#define S3C_SCR_RRD_EN (1 << 5) +#define S3C_SCR_SUS_EN (1 << 1) +#define S3C_SCR_RST_EN (1 << 0) +#define S3C_EP0SR S3C_HSUDC_REG(0x24) /* EP0 Status */ +#define S3C_EP0SR_EP0_LWO (1 << 6) +#define S3C_EP0SR_STALL (1 << 4) +#define S3C_EP0SR_TX_SUCCESS (1 << 1) +#define S3C_EP0SR_RX_SUCCESS (1 << 0) +#define S3C_EP0CR S3C_HSUDC_REG(0x28) /* EP0 Control */ +#define S3C_BR(_x) S3C_HSUDC_REG(0x60 + (_x * 4)) + +/* Indexed Registers */ +#define S3C_ESR S3C_HSUDC_REG(0x2c) /* EPn Status */ +#define S3C_ESR_FLUSH (1 << 6) +#define S3C_ESR_STALL (1 << 5) +#define S3C_ESR_LWO (1 << 4) +#define S3C_ESR_PSIF_ONE (1 << 2) +#define S3C_ESR_PSIF_TWO (2 << 2) +#define S3C_ESR_TX_SUCCESS (1 << 1) +#define S3C_ESR_RX_SUCCESS (1 << 0) +#define S3C_ECR S3C_HSUDC_REG(0x30) /* EPn Control */ +#define S3C_ECR_DUEN (1 << 7) +#define S3C_ECR_FLUSH (1 << 6) +#define S3C_ECR_STALL (1 << 1) +#define S3C_ECR_IEMS (1 << 0) +#define S3C_BRCR S3C_HSUDC_REG(0x34) /* Read Count */ +#define S3C_BWCR S3C_HSUDC_REG(0x38) /* Write Count */ +#define S3C_MPR S3C_HSUDC_REG(0x3c) /* Max Pkt Size */ + +#define WAIT_FOR_SETUP (0) +#define DATA_STATE_XMIT (1) +#define DATA_STATE_RECV (2) + +static const char * const s3c_hsudc_supply_names[] = { + "vdda", /* analog phy supply, 3.3V */ + "vddi", /* digital phy supply, 1.2V */ + "vddosc", /* oscillator supply, 1.8V - 3.3V */ +}; + +/** + * struct s3c_hsudc_ep - Endpoint representation used by driver. + * @ep: USB gadget layer representation of device endpoint. + * @name: Endpoint name (as required by ep autoconfiguration). + * @dev: Reference to the device controller to which this EP belongs. + * @desc: Endpoint descriptor obtained from the gadget driver. + * @queue: Transfer request queue for the endpoint. + * @stopped: Maintains state of endpoint, set if EP is halted. + * @bEndpointAddress: EP address (including direction bit). + * @fifo: Base address of EP FIFO. + */ +struct s3c_hsudc_ep { + struct usb_ep ep; + char name[20]; + struct s3c_hsudc *dev; + struct list_head queue; + u8 stopped; + u8 wedge; + u8 bEndpointAddress; + void __iomem *fifo; +}; + +/** + * struct s3c_hsudc_req - Driver encapsulation of USB gadget transfer request. + * @req: Reference to USB gadget transfer request. + * @queue: Used for inserting this request to the endpoint request queue. + */ +struct s3c_hsudc_req { + struct usb_request req; + struct list_head queue; +}; + +/** + * struct s3c_hsudc - Driver's abstraction of the device controller. + * @gadget: Instance of usb_gadget which is referenced by gadget driver. + * @driver: Reference to currenty active gadget driver. + * @dev: The device reference used by probe function. + * @lock: Lock to synchronize the usage of Endpoints (EP's are indexed). + * @regs: Remapped base address of controller's register space. + * irq: IRQ number used by the controller. + * uclk: Reference to the controller clock. + * ep0state: Current state of EP0. + * ep: List of endpoints supported by the controller. + */ +struct s3c_hsudc { + struct usb_gadget gadget; + struct usb_gadget_driver *driver; + struct device *dev; + struct s3c24xx_hsudc_platdata *pd; + struct usb_phy *transceiver; + struct regulator_bulk_data supplies[ARRAY_SIZE(s3c_hsudc_supply_names)]; + spinlock_t lock; + void __iomem *regs; + int irq; + struct clk *uclk; + int ep0state; + struct s3c_hsudc_ep ep[]; +}; + +#define ep_maxpacket(_ep) ((_ep)->ep.maxpacket) +#define ep_is_in(_ep) ((_ep)->bEndpointAddress & USB_DIR_IN) +#define ep_index(_ep) ((_ep)->bEndpointAddress & \ + USB_ENDPOINT_NUMBER_MASK) + +static const char driver_name[] = "s3c-udc"; +static const char ep0name[] = "ep0-control"; + +static inline struct s3c_hsudc_req *our_req(struct usb_request *req) +{ + return container_of(req, struct s3c_hsudc_req, req); +} + +static inline struct s3c_hsudc_ep *our_ep(struct usb_ep *ep) +{ + return container_of(ep, struct s3c_hsudc_ep, ep); +} + +static inline struct s3c_hsudc *to_hsudc(struct usb_gadget *gadget) +{ + return container_of(gadget, struct s3c_hsudc, gadget); +} + +static inline void set_index(struct s3c_hsudc *hsudc, int ep_addr) +{ + ep_addr &= USB_ENDPOINT_NUMBER_MASK; + writel(ep_addr, hsudc->regs + S3C_IR); +} + +static inline void __orr32(void __iomem *ptr, u32 val) +{ + writel(readl(ptr) | val, ptr); +} + +/** + * s3c_hsudc_complete_request - Complete a transfer request. + * @hsep: Endpoint to which the request belongs. + * @hsreq: Transfer request to be completed. + * @status: Transfer completion status for the transfer request. + */ +static void s3c_hsudc_complete_request(struct s3c_hsudc_ep *hsep, + struct s3c_hsudc_req *hsreq, int status) +{ + unsigned int stopped = hsep->stopped; + struct s3c_hsudc *hsudc = hsep->dev; + + list_del_init(&hsreq->queue); + hsreq->req.status = status; + + if (!ep_index(hsep)) { + hsudc->ep0state = WAIT_FOR_SETUP; + hsep->bEndpointAddress &= ~USB_DIR_IN; + } + + hsep->stopped = 1; + spin_unlock(&hsudc->lock); + usb_gadget_giveback_request(&hsep->ep, &hsreq->req); + spin_lock(&hsudc->lock); + hsep->stopped = stopped; +} + +/** + * s3c_hsudc_nuke_ep - Terminate all requests queued for a endpoint. + * @hsep: Endpoint for which queued requests have to be terminated. + * @status: Transfer completion status for the transfer request. + */ +static void s3c_hsudc_nuke_ep(struct s3c_hsudc_ep *hsep, int status) +{ + struct s3c_hsudc_req *hsreq; + + while (!list_empty(&hsep->queue)) { + hsreq = list_entry(hsep->queue.next, + struct s3c_hsudc_req, queue); + s3c_hsudc_complete_request(hsep, hsreq, status); + } +} + +/** + * s3c_hsudc_stop_activity - Stop activity on all endpoints. + * @hsudc: Device controller for which EP activity is to be stopped. + * + * All the endpoints are stopped and any pending transfer requests if any on + * the endpoint are terminated. + */ +static void s3c_hsudc_stop_activity(struct s3c_hsudc *hsudc) +{ + struct s3c_hsudc_ep *hsep; + int epnum; + + hsudc->gadget.speed = USB_SPEED_UNKNOWN; + + for (epnum = 0; epnum < hsudc->pd->epnum; epnum++) { + hsep = &hsudc->ep[epnum]; + hsep->stopped = 1; + s3c_hsudc_nuke_ep(hsep, -ESHUTDOWN); + } +} + +/** + * s3c_hsudc_read_setup_pkt - Read the received setup packet from EP0 fifo. + * @hsudc: Device controller from which setup packet is to be read. + * @buf: The buffer into which the setup packet is read. + * + * The setup packet received in the EP0 fifo is read and stored into a + * given buffer address. + */ + +static void s3c_hsudc_read_setup_pkt(struct s3c_hsudc *hsudc, u16 *buf) +{ + int count; + + count = readl(hsudc->regs + S3C_BRCR); + while (count--) + *buf++ = (u16)readl(hsudc->regs + S3C_BR(0)); + + writel(S3C_EP0SR_RX_SUCCESS, hsudc->regs + S3C_EP0SR); +} + +/** + * s3c_hsudc_write_fifo - Write next chunk of transfer data to EP fifo. + * @hsep: Endpoint to which the data is to be written. + * @hsreq: Transfer request from which the next chunk of data is written. + * + * Write the next chunk of data from a transfer request to the endpoint FIFO. + * If the transfer request completes, 1 is returned, otherwise 0 is returned. + */ +static int s3c_hsudc_write_fifo(struct s3c_hsudc_ep *hsep, + struct s3c_hsudc_req *hsreq) +{ + u16 *buf; + u32 max = ep_maxpacket(hsep); + u32 count, length; + bool is_last; + void __iomem *fifo = hsep->fifo; + + buf = hsreq->req.buf + hsreq->req.actual; + prefetch(buf); + + length = hsreq->req.length - hsreq->req.actual; + length = min(length, max); + hsreq->req.actual += length; + + writel(length, hsep->dev->regs + S3C_BWCR); + for (count = 0; count < length; count += 2) + writel(*buf++, fifo); + + if (count != max) { + is_last = true; + } else { + if (hsreq->req.length != hsreq->req.actual || hsreq->req.zero) + is_last = false; + else + is_last = true; + } + + if (is_last) { + s3c_hsudc_complete_request(hsep, hsreq, 0); + return 1; + } + + return 0; +} + +/** + * s3c_hsudc_read_fifo - Read the next chunk of data from EP fifo. + * @hsep: Endpoint from which the data is to be read. + * @hsreq: Transfer request to which the next chunk of data read is written. + * + * Read the next chunk of data from the endpoint FIFO and a write it to the + * transfer request buffer. If the transfer request completes, 1 is returned, + * otherwise 0 is returned. + */ +static int s3c_hsudc_read_fifo(struct s3c_hsudc_ep *hsep, + struct s3c_hsudc_req *hsreq) +{ + struct s3c_hsudc *hsudc = hsep->dev; + u32 csr, offset; + u16 *buf, word; + u32 buflen, rcnt, rlen; + void __iomem *fifo = hsep->fifo; + u32 is_short = 0; + + offset = (ep_index(hsep)) ? S3C_ESR : S3C_EP0SR; + csr = readl(hsudc->regs + offset); + if (!(csr & S3C_ESR_RX_SUCCESS)) + return -EINVAL; + + buf = hsreq->req.buf + hsreq->req.actual; + prefetchw(buf); + buflen = hsreq->req.length - hsreq->req.actual; + + rcnt = readl(hsudc->regs + S3C_BRCR); + rlen = (csr & S3C_ESR_LWO) ? (rcnt * 2 - 1) : (rcnt * 2); + + hsreq->req.actual += min(rlen, buflen); + is_short = (rlen < hsep->ep.maxpacket); + + while (rcnt-- != 0) { + word = (u16)readl(fifo); + if (buflen) { + *buf++ = word; + buflen--; + } else { + hsreq->req.status = -EOVERFLOW; + } + } + + writel(S3C_ESR_RX_SUCCESS, hsudc->regs + offset); + + if (is_short || hsreq->req.actual == hsreq->req.length) { + s3c_hsudc_complete_request(hsep, hsreq, 0); + return 1; + } + + return 0; +} + +/** + * s3c_hsudc_epin_intr - Handle in-endpoint interrupt. + * @hsudc - Device controller for which the interrupt is to be handled. + * @ep_idx - Endpoint number on which an interrupt is pending. + * + * Handles interrupt for a in-endpoint. The interrupts that are handled are + * stall and data transmit complete interrupt. + */ +static void s3c_hsudc_epin_intr(struct s3c_hsudc *hsudc, u32 ep_idx) +{ + struct s3c_hsudc_ep *hsep = &hsudc->ep[ep_idx]; + struct s3c_hsudc_req *hsreq; + u32 csr; + + csr = readl(hsudc->regs + S3C_ESR); + if (csr & S3C_ESR_STALL) { + writel(S3C_ESR_STALL, hsudc->regs + S3C_ESR); + return; + } + + if (csr & S3C_ESR_TX_SUCCESS) { + writel(S3C_ESR_TX_SUCCESS, hsudc->regs + S3C_ESR); + if (list_empty(&hsep->queue)) + return; + + hsreq = list_entry(hsep->queue.next, + struct s3c_hsudc_req, queue); + if ((s3c_hsudc_write_fifo(hsep, hsreq) == 0) && + (csr & S3C_ESR_PSIF_TWO)) + s3c_hsudc_write_fifo(hsep, hsreq); + } +} + +/** + * s3c_hsudc_epout_intr - Handle out-endpoint interrupt. + * @hsudc - Device controller for which the interrupt is to be handled. + * @ep_idx - Endpoint number on which an interrupt is pending. + * + * Handles interrupt for a out-endpoint. The interrupts that are handled are + * stall, flush and data ready interrupt. + */ +static void s3c_hsudc_epout_intr(struct s3c_hsudc *hsudc, u32 ep_idx) +{ + struct s3c_hsudc_ep *hsep = &hsudc->ep[ep_idx]; + struct s3c_hsudc_req *hsreq; + u32 csr; + + csr = readl(hsudc->regs + S3C_ESR); + if (csr & S3C_ESR_STALL) { + writel(S3C_ESR_STALL, hsudc->regs + S3C_ESR); + return; + } + + if (csr & S3C_ESR_FLUSH) { + __orr32(hsudc->regs + S3C_ECR, S3C_ECR_FLUSH); + return; + } + + if (csr & S3C_ESR_RX_SUCCESS) { + if (list_empty(&hsep->queue)) + return; + + hsreq = list_entry(hsep->queue.next, + struct s3c_hsudc_req, queue); + if (((s3c_hsudc_read_fifo(hsep, hsreq)) == 0) && + (csr & S3C_ESR_PSIF_TWO)) + s3c_hsudc_read_fifo(hsep, hsreq); + } +} + +/** s3c_hsudc_set_halt - Set or clear a endpoint halt. + * @_ep: Endpoint on which halt has to be set or cleared. + * @value: 1 for setting halt on endpoint, 0 to clear halt. + * + * Set or clear endpoint halt. If halt is set, the endpoint is stopped. + * If halt is cleared, for in-endpoints, if there are any pending + * transfer requests, transfers are started. + */ +static int s3c_hsudc_set_halt(struct usb_ep *_ep, int value) +{ + struct s3c_hsudc_ep *hsep = our_ep(_ep); + struct s3c_hsudc *hsudc = hsep->dev; + struct s3c_hsudc_req *hsreq; + unsigned long irqflags; + u32 ecr; + u32 offset; + + if (value && ep_is_in(hsep) && !list_empty(&hsep->queue)) + return -EAGAIN; + + spin_lock_irqsave(&hsudc->lock, irqflags); + set_index(hsudc, ep_index(hsep)); + offset = (ep_index(hsep)) ? S3C_ECR : S3C_EP0CR; + ecr = readl(hsudc->regs + offset); + + if (value) { + ecr |= S3C_ECR_STALL; + if (ep_index(hsep)) + ecr |= S3C_ECR_FLUSH; + hsep->stopped = 1; + } else { + ecr &= ~S3C_ECR_STALL; + hsep->stopped = hsep->wedge = 0; + } + writel(ecr, hsudc->regs + offset); + + if (ep_is_in(hsep) && !list_empty(&hsep->queue) && !value) { + hsreq = list_entry(hsep->queue.next, + struct s3c_hsudc_req, queue); + if (hsreq) + s3c_hsudc_write_fifo(hsep, hsreq); + } + + spin_unlock_irqrestore(&hsudc->lock, irqflags); + return 0; +} + +/** s3c_hsudc_set_wedge - Sets the halt feature with the clear requests ignored + * @_ep: Endpoint on which wedge has to be set. + * + * Sets the halt feature with the clear requests ignored. + */ +static int s3c_hsudc_set_wedge(struct usb_ep *_ep) +{ + struct s3c_hsudc_ep *hsep = our_ep(_ep); + + if (!hsep) + return -EINVAL; + + hsep->wedge = 1; + return usb_ep_set_halt(_ep); +} + +/** s3c_hsudc_handle_reqfeat - Handle set feature or clear feature requests. + * @_ep: Device controller on which the set/clear feature needs to be handled. + * @ctrl: Control request as received on the endpoint 0. + * + * Handle set feature or clear feature control requests on the control endpoint. + */ +static int s3c_hsudc_handle_reqfeat(struct s3c_hsudc *hsudc, + struct usb_ctrlrequest *ctrl) +{ + struct s3c_hsudc_ep *hsep; + bool set = (ctrl->bRequest == USB_REQ_SET_FEATURE); + u8 ep_num = ctrl->wIndex & USB_ENDPOINT_NUMBER_MASK; + + if (ctrl->bRequestType == USB_RECIP_ENDPOINT) { + hsep = &hsudc->ep[ep_num]; + switch (le16_to_cpu(ctrl->wValue)) { + case USB_ENDPOINT_HALT: + if (set || !hsep->wedge) + s3c_hsudc_set_halt(&hsep->ep, set); + return 0; + } + } + + return -ENOENT; +} + +/** + * s3c_hsudc_process_req_status - Handle get status control request. + * @hsudc: Device controller on which get status request has be handled. + * @ctrl: Control request as received on the endpoint 0. + * + * Handle get status control request received on control endpoint. + */ +static void s3c_hsudc_process_req_status(struct s3c_hsudc *hsudc, + struct usb_ctrlrequest *ctrl) +{ + struct s3c_hsudc_ep *hsep0 = &hsudc->ep[0]; + struct s3c_hsudc_req hsreq; + struct s3c_hsudc_ep *hsep; + __le16 reply; + u8 epnum; + + switch (ctrl->bRequestType & USB_RECIP_MASK) { + case USB_RECIP_DEVICE: + reply = cpu_to_le16(0); + break; + + case USB_RECIP_INTERFACE: + reply = cpu_to_le16(0); + break; + + case USB_RECIP_ENDPOINT: + epnum = le16_to_cpu(ctrl->wIndex) & USB_ENDPOINT_NUMBER_MASK; + hsep = &hsudc->ep[epnum]; + reply = cpu_to_le16(hsep->stopped ? 1 : 0); + break; + } + + INIT_LIST_HEAD(&hsreq.queue); + hsreq.req.length = 2; + hsreq.req.buf = &reply; + hsreq.req.actual = 0; + hsreq.req.complete = NULL; + s3c_hsudc_write_fifo(hsep0, &hsreq); +} + +/** + * s3c_hsudc_process_setup - Process control request received on endpoint 0. + * @hsudc: Device controller on which control request has been received. + * + * Read the control request received on endpoint 0, decode it and handle + * the request. + */ +static void s3c_hsudc_process_setup(struct s3c_hsudc *hsudc) +{ + struct s3c_hsudc_ep *hsep = &hsudc->ep[0]; + struct usb_ctrlrequest ctrl = {0}; + int ret; + + s3c_hsudc_nuke_ep(hsep, -EPROTO); + s3c_hsudc_read_setup_pkt(hsudc, (u16 *)&ctrl); + + if (ctrl.bRequestType & USB_DIR_IN) { + hsep->bEndpointAddress |= USB_DIR_IN; + hsudc->ep0state = DATA_STATE_XMIT; + } else { + hsep->bEndpointAddress &= ~USB_DIR_IN; + hsudc->ep0state = DATA_STATE_RECV; + } + + switch (ctrl.bRequest) { + case USB_REQ_SET_ADDRESS: + if (ctrl.bRequestType != (USB_TYPE_STANDARD | USB_RECIP_DEVICE)) + break; + hsudc->ep0state = WAIT_FOR_SETUP; + return; + + case USB_REQ_GET_STATUS: + if ((ctrl.bRequestType & USB_TYPE_MASK) != USB_TYPE_STANDARD) + break; + s3c_hsudc_process_req_status(hsudc, &ctrl); + return; + + case USB_REQ_SET_FEATURE: + case USB_REQ_CLEAR_FEATURE: + if ((ctrl.bRequestType & USB_TYPE_MASK) != USB_TYPE_STANDARD) + break; + s3c_hsudc_handle_reqfeat(hsudc, &ctrl); + hsudc->ep0state = WAIT_FOR_SETUP; + return; + } + + if (hsudc->driver) { + spin_unlock(&hsudc->lock); + ret = hsudc->driver->setup(&hsudc->gadget, &ctrl); + spin_lock(&hsudc->lock); + + if (ctrl.bRequest == USB_REQ_SET_CONFIGURATION) { + hsep->bEndpointAddress &= ~USB_DIR_IN; + hsudc->ep0state = WAIT_FOR_SETUP; + } + + if (ret < 0) { + dev_err(hsudc->dev, "setup failed, returned %d\n", + ret); + s3c_hsudc_set_halt(&hsep->ep, 1); + hsudc->ep0state = WAIT_FOR_SETUP; + hsep->bEndpointAddress &= ~USB_DIR_IN; + } + } +} + +/** s3c_hsudc_handle_ep0_intr - Handle endpoint 0 interrupt. + * @hsudc: Device controller on which endpoint 0 interrupt has occured. + * + * Handle endpoint 0 interrupt when it occurs. EP0 interrupt could occur + * when a stall handshake is sent to host or data is sent/received on + * endpoint 0. + */ +static void s3c_hsudc_handle_ep0_intr(struct s3c_hsudc *hsudc) +{ + struct s3c_hsudc_ep *hsep = &hsudc->ep[0]; + struct s3c_hsudc_req *hsreq; + u32 csr = readl(hsudc->regs + S3C_EP0SR); + u32 ecr; + + if (csr & S3C_EP0SR_STALL) { + ecr = readl(hsudc->regs + S3C_EP0CR); + ecr &= ~(S3C_ECR_STALL | S3C_ECR_FLUSH); + writel(ecr, hsudc->regs + S3C_EP0CR); + + writel(S3C_EP0SR_STALL, hsudc->regs + S3C_EP0SR); + hsep->stopped = 0; + + s3c_hsudc_nuke_ep(hsep, -ECONNABORTED); + hsudc->ep0state = WAIT_FOR_SETUP; + hsep->bEndpointAddress &= ~USB_DIR_IN; + return; + } + + if (csr & S3C_EP0SR_TX_SUCCESS) { + writel(S3C_EP0SR_TX_SUCCESS, hsudc->regs + S3C_EP0SR); + if (ep_is_in(hsep)) { + if (list_empty(&hsep->queue)) + return; + + hsreq = list_entry(hsep->queue.next, + struct s3c_hsudc_req, queue); + s3c_hsudc_write_fifo(hsep, hsreq); + } + } + + if (csr & S3C_EP0SR_RX_SUCCESS) { + if (hsudc->ep0state == WAIT_FOR_SETUP) + s3c_hsudc_process_setup(hsudc); + else { + if (!ep_is_in(hsep)) { + if (list_empty(&hsep->queue)) + return; + hsreq = list_entry(hsep->queue.next, + struct s3c_hsudc_req, queue); + s3c_hsudc_read_fifo(hsep, hsreq); + } + } + } +} + +/** + * s3c_hsudc_ep_enable - Enable a endpoint. + * @_ep: The endpoint to be enabled. + * @desc: Endpoint descriptor. + * + * Enables a endpoint when called from the gadget driver. Endpoint stall if + * any is cleared, transfer type is configured and endpoint interrupt is + * enabled. + */ +static int s3c_hsudc_ep_enable(struct usb_ep *_ep, + const struct usb_endpoint_descriptor *desc) +{ + struct s3c_hsudc_ep *hsep; + struct s3c_hsudc *hsudc; + unsigned long flags; + u32 ecr = 0; + + hsep = our_ep(_ep); + if (!_ep || !desc || _ep->name == ep0name + || desc->bDescriptorType != USB_DT_ENDPOINT + || hsep->bEndpointAddress != desc->bEndpointAddress + || ep_maxpacket(hsep) < usb_endpoint_maxp(desc)) + return -EINVAL; + + if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK + && usb_endpoint_maxp(desc) != ep_maxpacket(hsep)) + || !desc->wMaxPacketSize) + return -ERANGE; + + hsudc = hsep->dev; + if (!hsudc->driver || hsudc->gadget.speed == USB_SPEED_UNKNOWN) + return -ESHUTDOWN; + + spin_lock_irqsave(&hsudc->lock, flags); + + set_index(hsudc, hsep->bEndpointAddress); + ecr |= ((usb_endpoint_xfer_int(desc)) ? S3C_ECR_IEMS : S3C_ECR_DUEN); + writel(ecr, hsudc->regs + S3C_ECR); + + hsep->stopped = hsep->wedge = 0; + hsep->ep.desc = desc; + hsep->ep.maxpacket = usb_endpoint_maxp(desc); + + s3c_hsudc_set_halt(_ep, 0); + __set_bit(ep_index(hsep), hsudc->regs + S3C_EIER); + + spin_unlock_irqrestore(&hsudc->lock, flags); + return 0; +} + +/** + * s3c_hsudc_ep_disable - Disable a endpoint. + * @_ep: The endpoint to be disabled. + * @desc: Endpoint descriptor. + * + * Disables a endpoint when called from the gadget driver. + */ +static int s3c_hsudc_ep_disable(struct usb_ep *_ep) +{ + struct s3c_hsudc_ep *hsep = our_ep(_ep); + struct s3c_hsudc *hsudc = hsep->dev; + unsigned long flags; + + if (!_ep || !hsep->ep.desc) + return -EINVAL; + + spin_lock_irqsave(&hsudc->lock, flags); + + set_index(hsudc, hsep->bEndpointAddress); + __clear_bit(ep_index(hsep), hsudc->regs + S3C_EIER); + + s3c_hsudc_nuke_ep(hsep, -ESHUTDOWN); + + hsep->ep.desc = NULL; + hsep->stopped = 1; + + spin_unlock_irqrestore(&hsudc->lock, flags); + return 0; +} + +/** + * s3c_hsudc_alloc_request - Allocate a new request. + * @_ep: Endpoint for which request is allocated (not used). + * @gfp_flags: Flags used for the allocation. + * + * Allocates a single transfer request structure when called from gadget driver. + */ +static struct usb_request *s3c_hsudc_alloc_request(struct usb_ep *_ep, + gfp_t gfp_flags) +{ + struct s3c_hsudc_req *hsreq; + + hsreq = kzalloc(sizeof(*hsreq), gfp_flags); + if (!hsreq) + return NULL; + + INIT_LIST_HEAD(&hsreq->queue); + return &hsreq->req; +} + +/** + * s3c_hsudc_free_request - Deallocate a request. + * @ep: Endpoint for which request is deallocated (not used). + * @_req: Request to be deallocated. + * + * Allocates a single transfer request structure when called from gadget driver. + */ +static void s3c_hsudc_free_request(struct usb_ep *ep, struct usb_request *_req) +{ + struct s3c_hsudc_req *hsreq; + + hsreq = our_req(_req); + WARN_ON(!list_empty(&hsreq->queue)); + kfree(hsreq); +} + +/** + * s3c_hsudc_queue - Queue a transfer request for the endpoint. + * @_ep: Endpoint for which the request is queued. + * @_req: Request to be queued. + * @gfp_flags: Not used. + * + * Start or enqueue a request for a endpoint when called from gadget driver. + */ +static int s3c_hsudc_queue(struct usb_ep *_ep, struct usb_request *_req, + gfp_t gfp_flags) +{ + struct s3c_hsudc_req *hsreq; + struct s3c_hsudc_ep *hsep; + struct s3c_hsudc *hsudc; + unsigned long flags; + u32 offset; + u32 csr; + + hsreq = our_req(_req); + if ((!_req || !_req->complete || !_req->buf || + !list_empty(&hsreq->queue))) + return -EINVAL; + + hsep = our_ep(_ep); + hsudc = hsep->dev; + if (!hsudc->driver || hsudc->gadget.speed == USB_SPEED_UNKNOWN) + return -ESHUTDOWN; + + spin_lock_irqsave(&hsudc->lock, flags); + set_index(hsudc, hsep->bEndpointAddress); + + _req->status = -EINPROGRESS; + _req->actual = 0; + + if (!ep_index(hsep) && _req->length == 0) { + hsudc->ep0state = WAIT_FOR_SETUP; + s3c_hsudc_complete_request(hsep, hsreq, 0); + spin_unlock_irqrestore(&hsudc->lock, flags); + return 0; + } + + if (list_empty(&hsep->queue) && !hsep->stopped) { + offset = (ep_index(hsep)) ? S3C_ESR : S3C_EP0SR; + if (ep_is_in(hsep)) { + csr = readl(hsudc->regs + offset); + if (!(csr & S3C_ESR_TX_SUCCESS) && + (s3c_hsudc_write_fifo(hsep, hsreq) == 1)) + hsreq = NULL; + } else { + csr = readl(hsudc->regs + offset); + if ((csr & S3C_ESR_RX_SUCCESS) + && (s3c_hsudc_read_fifo(hsep, hsreq) == 1)) + hsreq = NULL; + } + } + + if (hsreq) + list_add_tail(&hsreq->queue, &hsep->queue); + + spin_unlock_irqrestore(&hsudc->lock, flags); + return 0; +} + +/** + * s3c_hsudc_dequeue - Dequeue a transfer request from an endpoint. + * @_ep: Endpoint from which the request is dequeued. + * @_req: Request to be dequeued. + * + * Dequeue a request from a endpoint when called from gadget driver. + */ +static int s3c_hsudc_dequeue(struct usb_ep *_ep, struct usb_request *_req) +{ + struct s3c_hsudc_ep *hsep = our_ep(_ep); + struct s3c_hsudc *hsudc = hsep->dev; + struct s3c_hsudc_req *hsreq; + unsigned long flags; + + hsep = our_ep(_ep); + if (!_ep || hsep->ep.name == ep0name) + return -EINVAL; + + spin_lock_irqsave(&hsudc->lock, flags); + + list_for_each_entry(hsreq, &hsep->queue, queue) { + if (&hsreq->req == _req) + break; + } + if (&hsreq->req != _req) { + spin_unlock_irqrestore(&hsudc->lock, flags); + return -EINVAL; + } + + set_index(hsudc, hsep->bEndpointAddress); + s3c_hsudc_complete_request(hsep, hsreq, -ECONNRESET); + + spin_unlock_irqrestore(&hsudc->lock, flags); + return 0; +} + +static const struct usb_ep_ops s3c_hsudc_ep_ops = { + .enable = s3c_hsudc_ep_enable, + .disable = s3c_hsudc_ep_disable, + .alloc_request = s3c_hsudc_alloc_request, + .free_request = s3c_hsudc_free_request, + .queue = s3c_hsudc_queue, + .dequeue = s3c_hsudc_dequeue, + .set_halt = s3c_hsudc_set_halt, + .set_wedge = s3c_hsudc_set_wedge, +}; + +/** + * s3c_hsudc_initep - Initialize a endpoint to default state. + * @hsudc - Reference to the device controller. + * @hsep - Endpoint to be initialized. + * @epnum - Address to be assigned to the endpoint. + * + * Initialize a endpoint with default configuration. + */ +static void s3c_hsudc_initep(struct s3c_hsudc *hsudc, + struct s3c_hsudc_ep *hsep, int epnum) +{ + char *dir; + + if ((epnum % 2) == 0) { + dir = "out"; + } else { + dir = "in"; + hsep->bEndpointAddress = USB_DIR_IN; + } + + hsep->bEndpointAddress |= epnum; + if (epnum) + snprintf(hsep->name, sizeof(hsep->name), "ep%d%s", epnum, dir); + else + snprintf(hsep->name, sizeof(hsep->name), "%s", ep0name); + + INIT_LIST_HEAD(&hsep->queue); + INIT_LIST_HEAD(&hsep->ep.ep_list); + if (epnum) + list_add_tail(&hsep->ep.ep_list, &hsudc->gadget.ep_list); + + hsep->dev = hsudc; + hsep->ep.name = hsep->name; + usb_ep_set_maxpacket_limit(&hsep->ep, epnum ? 512 : 64); + hsep->ep.ops = &s3c_hsudc_ep_ops; + hsep->fifo = hsudc->regs + S3C_BR(epnum); + hsep->ep.desc = NULL; + hsep->stopped = 0; + hsep->wedge = 0; + + if (epnum == 0) { + hsep->ep.caps.type_control = true; + hsep->ep.caps.dir_in = true; + hsep->ep.caps.dir_out = true; + } else { + hsep->ep.caps.type_iso = true; + hsep->ep.caps.type_bulk = true; + hsep->ep.caps.type_int = true; + } + + if (epnum & 1) + hsep->ep.caps.dir_in = true; + else + hsep->ep.caps.dir_out = true; + + set_index(hsudc, epnum); + writel(hsep->ep.maxpacket, hsudc->regs + S3C_MPR); +} + +/** + * s3c_hsudc_setup_ep - Configure all endpoints to default state. + * @hsudc: Reference to device controller. + * + * Configures all endpoints to default state. + */ +static void s3c_hsudc_setup_ep(struct s3c_hsudc *hsudc) +{ + int epnum; + + hsudc->ep0state = WAIT_FOR_SETUP; + INIT_LIST_HEAD(&hsudc->gadget.ep_list); + for (epnum = 0; epnum < hsudc->pd->epnum; epnum++) + s3c_hsudc_initep(hsudc, &hsudc->ep[epnum], epnum); +} + +/** + * s3c_hsudc_reconfig - Reconfigure the device controller to default state. + * @hsudc: Reference to device controller. + * + * Reconfigures the device controller registers to a default state. + */ +static void s3c_hsudc_reconfig(struct s3c_hsudc *hsudc) +{ + writel(0xAA, hsudc->regs + S3C_EDR); + writel(1, hsudc->regs + S3C_EIER); + writel(0, hsudc->regs + S3C_TR); + writel(S3C_SCR_DTZIEN_EN | S3C_SCR_RRD_EN | S3C_SCR_SUS_EN | + S3C_SCR_RST_EN, hsudc->regs + S3C_SCR); + writel(0, hsudc->regs + S3C_EP0CR); + + s3c_hsudc_setup_ep(hsudc); +} + +/** + * s3c_hsudc_irq - Interrupt handler for device controller. + * @irq: Not used. + * @_dev: Reference to the device controller. + * + * Interrupt handler for the device controller. This handler handles controller + * interrupts and endpoint interrupts. + */ +static irqreturn_t s3c_hsudc_irq(int irq, void *_dev) +{ + struct s3c_hsudc *hsudc = _dev; + struct s3c_hsudc_ep *hsep; + u32 ep_intr; + u32 sys_status; + u32 ep_idx; + + spin_lock(&hsudc->lock); + + sys_status = readl(hsudc->regs + S3C_SSR); + ep_intr = readl(hsudc->regs + S3C_EIR) & 0x3FF; + + if (!ep_intr && !(sys_status & S3C_SSR_DTZIEN_EN)) { + spin_unlock(&hsudc->lock); + return IRQ_HANDLED; + } + + if (sys_status) { + if (sys_status & S3C_SSR_VBUSON) + writel(S3C_SSR_VBUSON, hsudc->regs + S3C_SSR); + + if (sys_status & S3C_SSR_ERR) + writel(S3C_SSR_ERR, hsudc->regs + S3C_SSR); + + if (sys_status & S3C_SSR_SDE) { + writel(S3C_SSR_SDE, hsudc->regs + S3C_SSR); + hsudc->gadget.speed = (sys_status & S3C_SSR_HSP) ? + USB_SPEED_HIGH : USB_SPEED_FULL; + } + + if (sys_status & S3C_SSR_SUSPEND) { + writel(S3C_SSR_SUSPEND, hsudc->regs + S3C_SSR); + if (hsudc->gadget.speed != USB_SPEED_UNKNOWN + && hsudc->driver && hsudc->driver->suspend) + hsudc->driver->suspend(&hsudc->gadget); + } + + if (sys_status & S3C_SSR_RESUME) { + writel(S3C_SSR_RESUME, hsudc->regs + S3C_SSR); + if (hsudc->gadget.speed != USB_SPEED_UNKNOWN + && hsudc->driver && hsudc->driver->resume) + hsudc->driver->resume(&hsudc->gadget); + } + + if (sys_status & S3C_SSR_RESET) { + writel(S3C_SSR_RESET, hsudc->regs + S3C_SSR); + for (ep_idx = 0; ep_idx < hsudc->pd->epnum; ep_idx++) { + hsep = &hsudc->ep[ep_idx]; + hsep->stopped = 1; + s3c_hsudc_nuke_ep(hsep, -ECONNRESET); + } + s3c_hsudc_reconfig(hsudc); + hsudc->ep0state = WAIT_FOR_SETUP; + } + } + + if (ep_intr & S3C_EIR_EP0) { + writel(S3C_EIR_EP0, hsudc->regs + S3C_EIR); + set_index(hsudc, 0); + s3c_hsudc_handle_ep0_intr(hsudc); + } + + ep_intr >>= 1; + ep_idx = 1; + while (ep_intr) { + if (ep_intr & 1) { + hsep = &hsudc->ep[ep_idx]; + set_index(hsudc, ep_idx); + writel(1 << ep_idx, hsudc->regs + S3C_EIR); + if (ep_is_in(hsep)) + s3c_hsudc_epin_intr(hsudc, ep_idx); + else + s3c_hsudc_epout_intr(hsudc, ep_idx); + } + ep_intr >>= 1; + ep_idx++; + } + + spin_unlock(&hsudc->lock); + return IRQ_HANDLED; +} + +static int s3c_hsudc_start(struct usb_gadget *gadget, + struct usb_gadget_driver *driver) +{ + struct s3c_hsudc *hsudc = to_hsudc(gadget); + int ret; + + if (!driver + || driver->max_speed < USB_SPEED_FULL + || !driver->setup) + return -EINVAL; + + if (!hsudc) + return -ENODEV; + + if (hsudc->driver) + return -EBUSY; + + hsudc->driver = driver; + + ret = regulator_bulk_enable(ARRAY_SIZE(hsudc->supplies), + hsudc->supplies); + if (ret != 0) { + dev_err(hsudc->dev, "failed to enable supplies: %d\n", ret); + goto err_supplies; + } + + /* connect to bus through transceiver */ + if (!IS_ERR_OR_NULL(hsudc->transceiver)) { + ret = otg_set_peripheral(hsudc->transceiver->otg, + &hsudc->gadget); + if (ret) { + dev_err(hsudc->dev, "%s: can't bind to transceiver\n", + hsudc->gadget.name); + goto err_otg; + } + } + + enable_irq(hsudc->irq); + s3c_hsudc_reconfig(hsudc); + + pm_runtime_get_sync(hsudc->dev); + + if (hsudc->pd->phy_init) + hsudc->pd->phy_init(); + if (hsudc->pd->gpio_init) + hsudc->pd->gpio_init(); + + return 0; +err_otg: + regulator_bulk_disable(ARRAY_SIZE(hsudc->supplies), hsudc->supplies); +err_supplies: + hsudc->driver = NULL; + return ret; +} + +static int s3c_hsudc_stop(struct usb_gadget *gadget) +{ + struct s3c_hsudc *hsudc = to_hsudc(gadget); + unsigned long flags; + + if (!hsudc) + return -ENODEV; + + spin_lock_irqsave(&hsudc->lock, flags); + hsudc->gadget.speed = USB_SPEED_UNKNOWN; + if (hsudc->pd->phy_uninit) + hsudc->pd->phy_uninit(); + + pm_runtime_put(hsudc->dev); + + if (hsudc->pd->gpio_uninit) + hsudc->pd->gpio_uninit(); + s3c_hsudc_stop_activity(hsudc); + spin_unlock_irqrestore(&hsudc->lock, flags); + + if (!IS_ERR_OR_NULL(hsudc->transceiver)) + (void) otg_set_peripheral(hsudc->transceiver->otg, NULL); + + disable_irq(hsudc->irq); + + regulator_bulk_disable(ARRAY_SIZE(hsudc->supplies), hsudc->supplies); + hsudc->driver = NULL; + + return 0; +} + +static inline u32 s3c_hsudc_read_frameno(struct s3c_hsudc *hsudc) +{ + return readl(hsudc->regs + S3C_FNR) & 0x3FF; +} + +static int s3c_hsudc_gadget_getframe(struct usb_gadget *gadget) +{ + return s3c_hsudc_read_frameno(to_hsudc(gadget)); +} + +static int s3c_hsudc_vbus_draw(struct usb_gadget *gadget, unsigned mA) +{ + struct s3c_hsudc *hsudc = to_hsudc(gadget); + + if (!hsudc) + return -ENODEV; + + if (!IS_ERR_OR_NULL(hsudc->transceiver)) + return usb_phy_set_power(hsudc->transceiver, mA); + + return -EOPNOTSUPP; +} + +static const struct usb_gadget_ops s3c_hsudc_gadget_ops = { + .get_frame = s3c_hsudc_gadget_getframe, + .udc_start = s3c_hsudc_start, + .udc_stop = s3c_hsudc_stop, + .vbus_draw = s3c_hsudc_vbus_draw, +}; + +static int s3c_hsudc_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct s3c_hsudc *hsudc; + struct s3c24xx_hsudc_platdata *pd = dev_get_platdata(&pdev->dev); + int ret, i; + + hsudc = devm_kzalloc(&pdev->dev, sizeof(struct s3c_hsudc) + + sizeof(struct s3c_hsudc_ep) * pd->epnum, + GFP_KERNEL); + if (!hsudc) + return -ENOMEM; + + platform_set_drvdata(pdev, dev); + hsudc->dev = dev; + hsudc->pd = dev_get_platdata(&pdev->dev); + + hsudc->transceiver = usb_get_phy(USB_PHY_TYPE_USB2); + + for (i = 0; i < ARRAY_SIZE(hsudc->supplies); i++) + hsudc->supplies[i].supply = s3c_hsudc_supply_names[i]; + + ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(hsudc->supplies), + hsudc->supplies); + if (ret != 0) { + if (ret != -EPROBE_DEFER) + dev_err(dev, "failed to request supplies: %d\n", ret); + goto err_supplies; + } + + hsudc->regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(hsudc->regs)) { + ret = PTR_ERR(hsudc->regs); + goto err_res; + } + + spin_lock_init(&hsudc->lock); + + hsudc->gadget.max_speed = USB_SPEED_HIGH; + hsudc->gadget.ops = &s3c_hsudc_gadget_ops; + hsudc->gadget.name = dev_name(dev); + hsudc->gadget.ep0 = &hsudc->ep[0].ep; + hsudc->gadget.is_otg = 0; + hsudc->gadget.is_a_peripheral = 0; + hsudc->gadget.speed = USB_SPEED_UNKNOWN; + + s3c_hsudc_setup_ep(hsudc); + + ret = platform_get_irq(pdev, 0); + if (ret < 0) + goto err_res; + hsudc->irq = ret; + + ret = devm_request_irq(&pdev->dev, hsudc->irq, s3c_hsudc_irq, 0, + driver_name, hsudc); + if (ret < 0) { + dev_err(dev, "irq request failed\n"); + goto err_res; + } + + hsudc->uclk = devm_clk_get(&pdev->dev, "usb-device"); + if (IS_ERR(hsudc->uclk)) { + dev_err(dev, "failed to find usb-device clock source\n"); + ret = PTR_ERR(hsudc->uclk); + goto err_res; + } + clk_enable(hsudc->uclk); + + local_irq_disable(); + + disable_irq(hsudc->irq); + local_irq_enable(); + + ret = usb_add_gadget_udc(&pdev->dev, &hsudc->gadget); + if (ret) + goto err_add_udc; + + pm_runtime_enable(dev); + + return 0; +err_add_udc: + clk_disable(hsudc->uclk); +err_res: + if (!IS_ERR_OR_NULL(hsudc->transceiver)) + usb_put_phy(hsudc->transceiver); + +err_supplies: + return ret; +} + +static struct platform_driver s3c_hsudc_driver = { + .driver = { + .name = "s3c-hsudc", + }, + .probe = s3c_hsudc_probe, +}; + +module_platform_driver(s3c_hsudc_driver); + +MODULE_DESCRIPTION("Samsung S3C24XX USB high-speed controller driver"); +MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:s3c-hsudc"); |