diff options
Diffstat (limited to 'drivers/usb/host/isp1760-udc.c')
| -rw-r--r-- | drivers/usb/host/isp1760-udc.c | 1495 |
1 files changed, 0 insertions, 1495 deletions
diff --git a/drivers/usb/host/isp1760-udc.c b/drivers/usb/host/isp1760-udc.c deleted file mode 100644 index 6bfda3082807..000000000000 --- a/drivers/usb/host/isp1760-udc.c +++ /dev/null @@ -1,1495 +0,0 @@ -/* - * Driver for the NXP ISP1761 device controller - * - * Copyright 2014 Ideas on Board Oy - * - * Contacts: - * Laurent Pinchart <laurent.pinchart@ideasonboard.com> - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * version 2 as published by the Free Software Foundation. - */ - -#include <linux/interrupt.h> -#include <linux/io.h> -#include <linux/kernel.h> -#include <linux/list.h> -#include <linux/module.h> -#include <linux/slab.h> -#include <linux/timer.h> -#include <linux/usb.h> - -#include "isp1760-core.h" -#include "isp1760-regs.h" -#include "isp1760-udc.h" - -#define ISP1760_VBUS_POLL_INTERVAL msecs_to_jiffies(500) - -struct isp1760_request { - struct usb_request req; - struct list_head queue; - struct isp1760_ep *ep; - unsigned int packet_size; -}; - -static inline struct isp1760_udc *gadget_to_udc(struct usb_gadget *gadget) -{ - return container_of(gadget, struct isp1760_udc, gadget); -} - -static inline struct isp1760_ep *ep_to_udc_ep(struct usb_ep *ep) -{ - return container_of(ep, struct isp1760_ep, ep); -} - -static inline struct isp1760_request *req_to_udc_req(struct usb_request *req) -{ - return container_of(req, struct isp1760_request, req); -} - -static inline u32 isp1760_udc_read(struct isp1760_udc *udc, u16 reg) -{ - return isp1760_read32(udc->regs, reg); -} - -static inline void isp1760_udc_write(struct isp1760_udc *udc, u16 reg, u32 val) -{ - isp1760_write32(udc->regs, reg, val); -} - -/* ----------------------------------------------------------------------------- - * Endpoint Management - */ - -static struct isp1760_ep *isp1760_udc_find_ep(struct isp1760_udc *udc, - u16 index) -{ - unsigned int i; - - if (index == 0) - return &udc->ep[0]; - - for (i = 1; i < ARRAY_SIZE(udc->ep); ++i) { - if (udc->ep[i].addr == index) - return udc->ep[i].desc ? &udc->ep[i] : NULL; - } - - return NULL; -} - -static void __isp1760_udc_select_ep(struct isp1760_ep *ep, int dir) -{ - isp1760_udc_write(ep->udc, DC_EPINDEX, - DC_ENDPIDX(ep->addr & USB_ENDPOINT_NUMBER_MASK) | - (dir == USB_DIR_IN ? DC_EPDIR : 0)); -} - -/** - * isp1760_udc_select_ep - Select an endpoint for register access - * @ep: The endpoint - * - * The ISP1761 endpoint registers are banked. This function selects the target - * endpoint for banked register access. The selection remains valid until the - * next call to this function, the next direct access to the EPINDEX register - * or the next reset, whichever comes first. - * - * Called with the UDC spinlock held. - */ -static void isp1760_udc_select_ep(struct isp1760_ep *ep) -{ - __isp1760_udc_select_ep(ep, ep->addr & USB_ENDPOINT_DIR_MASK); -} - -/* Called with the UDC spinlock held. */ -static void isp1760_udc_ctrl_send_status(struct isp1760_ep *ep, int dir) -{ - struct isp1760_udc *udc = ep->udc; - - /* - * Proceed to the status stage. The status stage data packet flows in - * the direction opposite to the data stage data packets, we thus need - * to select the OUT/IN endpoint for IN/OUT transfers. - */ - isp1760_udc_write(udc, DC_EPINDEX, DC_ENDPIDX(0) | - (dir == USB_DIR_IN ? 0 : DC_EPDIR)); - isp1760_udc_write(udc, DC_CTRLFUNC, DC_STATUS); - - /* - * The hardware will terminate the request automatically and go back to - * the setup stage without notifying us. - */ - udc->ep0_state = ISP1760_CTRL_SETUP; -} - -/* Called without the UDC spinlock held. */ -static void isp1760_udc_request_complete(struct isp1760_ep *ep, - struct isp1760_request *req, - int status) -{ - struct isp1760_udc *udc = ep->udc; - unsigned long flags; - - dev_dbg(ep->udc->isp->dev, "completing request %p with status %d\n", - req, status); - - req->ep = NULL; - req->req.status = status; - req->req.complete(&ep->ep, &req->req); - - spin_lock_irqsave(&udc->lock, flags); - - /* - * When completing control OUT requests, move to the status stage after - * calling the request complete callback. This gives the gadget an - * opportunity to stall the control transfer if needed. - */ - if (status == 0 && ep->addr == 0 && udc->ep0_dir == USB_DIR_OUT) - isp1760_udc_ctrl_send_status(ep, USB_DIR_OUT); - - spin_unlock_irqrestore(&udc->lock, flags); -} - -static void isp1760_udc_ctrl_send_stall(struct isp1760_ep *ep) -{ - struct isp1760_udc *udc = ep->udc; - unsigned long flags; - - dev_dbg(ep->udc->isp->dev, "%s(ep%02x)\n", __func__, ep->addr); - - spin_lock_irqsave(&udc->lock, flags); - - /* Stall both the IN and OUT endpoints. */ - __isp1760_udc_select_ep(ep, USB_DIR_OUT); - isp1760_udc_write(udc, DC_CTRLFUNC, DC_STALL); - __isp1760_udc_select_ep(ep, USB_DIR_IN); - isp1760_udc_write(udc, DC_CTRLFUNC, DC_STALL); - - /* A protocol stall completes the control transaction. */ - udc->ep0_state = ISP1760_CTRL_SETUP; - - spin_unlock_irqrestore(&udc->lock, flags); -} - -/* ----------------------------------------------------------------------------- - * Data Endpoints - */ - -/* Called with the UDC spinlock held. */ -static bool isp1760_udc_receive(struct isp1760_ep *ep, - struct isp1760_request *req) -{ - struct isp1760_udc *udc = ep->udc; - unsigned int len; - u32 *buf; - int i; - - isp1760_udc_select_ep(ep); - len = isp1760_udc_read(udc, DC_BUFLEN) & DC_DATACOUNT_MASK; - - dev_dbg(udc->isp->dev, "%s: received %u bytes (%u/%u done)\n", - __func__, len, req->req.actual, req->req.length); - - len = min(len, req->req.length - req->req.actual); - - if (!len) { - /* - * There's no data to be read from the FIFO, acknowledge the RX - * interrupt by clearing the buffer. - * - * TODO: What if another packet arrives in the meantime ? The - * datasheet doesn't clearly document how this should be - * handled. - */ - isp1760_udc_write(udc, DC_CTRLFUNC, DC_CLBUF); - return false; - } - - buf = req->req.buf + req->req.actual; - - /* - * Make sure not to read more than one extra byte, otherwise data from - * the next packet might be removed from the FIFO. - */ - for (i = len; i > 2; i -= 4, ++buf) - *buf = le32_to_cpu(isp1760_udc_read(udc, DC_DATAPORT)); - if (i > 0) - *(u16 *)buf = le16_to_cpu(readw(udc->regs + DC_DATAPORT)); - - req->req.actual += len; - - /* - * TODO: The short_not_ok flag isn't supported yet, but isn't used by - * any gadget driver either. - */ - - dev_dbg(udc->isp->dev, - "%s: req %p actual/length %u/%u maxpacket %u packet size %u\n", - __func__, req, req->req.actual, req->req.length, ep->maxpacket, - len); - - ep->rx_pending = false; - - /* - * Complete the request if all data has been received or if a short - * packet has been received. - */ - if (req->req.actual == req->req.length || len < ep->maxpacket) { - list_del(&req->queue); - return true; - } - - return false; -} - -static void isp1760_udc_transmit(struct isp1760_ep *ep, - struct isp1760_request *req) -{ - struct isp1760_udc *udc = ep->udc; - u32 *buf = req->req.buf + req->req.actual; - int i; - - req->packet_size = min(req->req.length - req->req.actual, - ep->maxpacket); - - dev_dbg(udc->isp->dev, "%s: transferring %u bytes (%u/%u done)\n", - __func__, req->packet_size, req->req.actual, - req->req.length); - - __isp1760_udc_select_ep(ep, USB_DIR_IN); - - if (req->packet_size) - isp1760_udc_write(udc, DC_BUFLEN, req->packet_size); - - /* - * Make sure not to write more than one extra byte, otherwise extra data - * will stay in the FIFO and will be transmitted during the next control - * request. The endpoint control CLBUF bit is supposed to allow flushing - * the FIFO for this kind of conditions, but doesn't seem to work. - */ - for (i = req->packet_size; i > 2; i -= 4, ++buf) - isp1760_udc_write(udc, DC_DATAPORT, cpu_to_le32(*buf)); - if (i > 0) - writew(cpu_to_le16(*(u16 *)buf), udc->regs + DC_DATAPORT); - - if (ep->addr == 0) - isp1760_udc_write(udc, DC_CTRLFUNC, DC_DSEN); - if (!req->packet_size) - isp1760_udc_write(udc, DC_CTRLFUNC, DC_VENDP); -} - -static void isp1760_ep_rx_ready(struct isp1760_ep *ep) -{ - struct isp1760_udc *udc = ep->udc; - struct isp1760_request *req; - bool complete; - - spin_lock(&udc->lock); - - if (ep->addr == 0 && udc->ep0_state != ISP1760_CTRL_DATA_OUT) { - spin_unlock(&udc->lock); - dev_dbg(udc->isp->dev, "%s: invalid ep0 state %u\n", __func__, - udc->ep0_state); - return; - } - - if (ep->addr != 0 && !ep->desc) { - spin_unlock(&udc->lock); - dev_dbg(udc->isp->dev, "%s: ep%02x is disabled\n", __func__, - ep->addr); - return; - } - - if (list_empty(&ep->queue)) { - ep->rx_pending = true; - spin_unlock(&udc->lock); - dev_dbg(udc->isp->dev, "%s: ep%02x (%p) has no request queued\n", - __func__, ep->addr, ep); - return; - } - - req = list_first_entry(&ep->queue, struct isp1760_request, - queue); - complete = isp1760_udc_receive(ep, req); - - spin_unlock(&udc->lock); - - if (complete) - isp1760_udc_request_complete(ep, req, 0); -} - -static void isp1760_ep_tx_complete(struct isp1760_ep *ep) -{ - struct isp1760_udc *udc = ep->udc; - struct isp1760_request *complete = NULL; - struct isp1760_request *req; - bool need_zlp; - - spin_lock(&udc->lock); - - if (ep->addr == 0 && udc->ep0_state != ISP1760_CTRL_DATA_IN) { - spin_unlock(&udc->lock); - dev_dbg(udc->isp->dev, "TX IRQ: invalid endpoint state %u\n", - udc->ep0_state); - return; - } - - if (list_empty(&ep->queue)) { - /* - * This can happen for the control endpoint when the reply to - * the GET_STATUS IN control request is sent directly by the - * setup IRQ handler. Just proceed to the status stage. - */ - if (ep->addr == 0) { - isp1760_udc_ctrl_send_status(ep, USB_DIR_IN); - spin_unlock(&udc->lock); - return; - } - - spin_unlock(&udc->lock); - dev_dbg(udc->isp->dev, "%s: ep%02x has no request queued\n", - __func__, ep->addr); - return; - } - - req = list_first_entry(&ep->queue, struct isp1760_request, - queue); - req->req.actual += req->packet_size; - - need_zlp = req->req.actual == req->req.length && - !(req->req.length % ep->maxpacket) && - req->packet_size && req->req.zero; - - dev_dbg(udc->isp->dev, - "TX IRQ: req %p actual/length %u/%u maxpacket %u packet size %u zero %u need zlp %u\n", - req, req->req.actual, req->req.length, ep->maxpacket, - req->packet_size, req->req.zero, need_zlp); - - /* - * Complete the request if all data has been sent and we don't need to - * transmit a zero length packet. - */ - if (req->req.actual == req->req.length && !need_zlp) { - complete = req; - list_del(&req->queue); - - if (ep->addr == 0) - isp1760_udc_ctrl_send_status(ep, USB_DIR_IN); - - if (!list_empty(&ep->queue)) - req = list_first_entry(&ep->queue, - struct isp1760_request, queue); - else - req = NULL; - } - - /* - * Transmit the next packet or start the next request, if any. - * - * TODO: If the endpoint is stalled the next request shouldn't be - * started, but what about the next packet ? - */ - if (req) - isp1760_udc_transmit(ep, req); - - spin_unlock(&udc->lock); - - if (complete) - isp1760_udc_request_complete(ep, complete, 0); -} - -static int __isp1760_udc_set_halt(struct isp1760_ep *ep, bool halt) -{ - struct isp1760_udc *udc = ep->udc; - - dev_dbg(udc->isp->dev, "%s: %s halt on ep%02x\n", __func__, - halt ? "set" : "clear", ep->addr); - - if (ep->desc && usb_endpoint_xfer_isoc(ep->desc)) { - dev_dbg(udc->isp->dev, "%s: ep%02x is isochronous\n", __func__, - ep->addr); - return -EINVAL; - } - - isp1760_udc_select_ep(ep); - isp1760_udc_write(udc, DC_CTRLFUNC, halt ? DC_STALL : 0); - - if (ep->addr == 0) { - /* When halting the control endpoint, stall both IN and OUT. */ - __isp1760_udc_select_ep(ep, USB_DIR_IN); - isp1760_udc_write(udc, DC_CTRLFUNC, halt ? DC_STALL : 0); - } else if (!halt) { - /* Reset the data PID by cycling the endpoint enable bit. */ - u16 eptype = isp1760_udc_read(udc, DC_EPTYPE); - - isp1760_udc_write(udc, DC_EPTYPE, eptype & ~DC_EPENABLE); - isp1760_udc_write(udc, DC_EPTYPE, eptype); - - /* - * Disabling the endpoint emptied the transmit FIFO, fill it - * again if a request is pending. - * - * TODO: Does the gadget framework require synchronizatino with - * the TX IRQ handler ? - */ - if ((ep->addr & USB_DIR_IN) && !list_empty(&ep->queue)) { - struct isp1760_request *req; - - req = list_first_entry(&ep->queue, - struct isp1760_request, queue); - isp1760_udc_transmit(ep, req); - } - } - - ep->halted = halt; - - return 0; -} - -/* ----------------------------------------------------------------------------- - * Control Endpoint - */ - -static int isp1760_udc_get_status(struct isp1760_udc *udc, - const struct usb_ctrlrequest *req) -{ - struct isp1760_ep *ep; - u16 status; - - if (req->wLength != cpu_to_le16(2) || req->wValue != cpu_to_le16(0)) - return -EINVAL; - - switch (req->bRequestType) { - case USB_DIR_IN | USB_RECIP_DEVICE: - status = udc->devstatus; - break; - - case USB_DIR_IN | USB_RECIP_INTERFACE: - status = 0; - break; - - case USB_DIR_IN | USB_RECIP_ENDPOINT: - ep = isp1760_udc_find_ep(udc, le16_to_cpu(req->wIndex)); - if (!ep) - return -EINVAL; - - status = 0; - if (ep->halted) - status |= 1 << USB_ENDPOINT_HALT; - break; - - default: - return -EINVAL; - } - - isp1760_udc_write(udc, DC_EPINDEX, DC_ENDPIDX(0) | DC_EPDIR); - isp1760_udc_write(udc, DC_BUFLEN, 2); - - writew(cpu_to_le16(status), udc->regs + DC_DATAPORT); - - isp1760_udc_write(udc, DC_CTRLFUNC, DC_DSEN); - - dev_dbg(udc->isp->dev, "%s: status 0x%04x\n", __func__, status); - - return 0; -} - -static int isp1760_udc_set_address(struct isp1760_udc *udc, u16 addr) -{ - if (addr > 127) { - dev_dbg(udc->isp->dev, "invalid device address %u\n", addr); - return -EINVAL; - } - - if (udc->gadget.state != USB_STATE_DEFAULT && - udc->gadget.state != USB_STATE_ADDRESS) { - dev_dbg(udc->isp->dev, "can't set address in state %u\n", - udc->gadget.state); - return -EINVAL; - } - - usb_gadget_set_state(&udc->gadget, addr ? USB_STATE_ADDRESS : - USB_STATE_DEFAULT); - - isp1760_udc_write(udc, DC_ADDRESS, DC_DEVEN | addr); - - spin_lock(&udc->lock); - isp1760_udc_ctrl_send_status(&udc->ep[0], USB_DIR_OUT); - spin_unlock(&udc->lock); - - return 0; -} - -static bool isp1760_ep0_setup_standard(struct isp1760_udc *udc, - struct usb_ctrlrequest *req) -{ - bool stall; - - switch (req->bRequest) { - case USB_REQ_GET_STATUS: - return isp1760_udc_get_status(udc, req); - - case USB_REQ_CLEAR_FEATURE: - switch (req->bRequestType) { - case USB_DIR_OUT | USB_RECIP_DEVICE: { - /* TODO: Handle remote wakeup feature. */ - return true; - } - - case USB_DIR_OUT | USB_RECIP_ENDPOINT: { - u16 index = le16_to_cpu(req->wIndex); - struct isp1760_ep *ep; - - if (req->wLength != cpu_to_le16(0) || - req->wValue != cpu_to_le16(USB_ENDPOINT_HALT)) - return true; - - ep = isp1760_udc_find_ep(udc, index); - if (!ep) - return true; - - spin_lock(&udc->lock); - - /* - * If the endpoint is wedged only the gadget can clear - * the halt feature. Pretend success in that case, but - * keep the endpoint halted. - */ - if (!ep->wedged) - stall = __isp1760_udc_set_halt(ep, false); - else - stall = false; - - if (!stall) - isp1760_udc_ctrl_send_status(&udc->ep[0], - USB_DIR_OUT); - - spin_unlock(&udc->lock); - return stall; - } - - default: - return true; - } - break; - - case USB_REQ_SET_FEATURE: - switch (req->bRequestType) { - case USB_DIR_OUT | USB_RECIP_DEVICE: { - /* TODO: Handle remote wakeup and test mode features */ - return true; - } - - case USB_DIR_OUT | USB_RECIP_ENDPOINT: { - u16 index = le16_to_cpu(req->wIndex); - struct isp1760_ep *ep; - - if (req->wLength != cpu_to_le16(0) || - req->wValue != cpu_to_le16(USB_ENDPOINT_HALT)) - return true; - - ep = isp1760_udc_find_ep(udc, index); - if (!ep) - return true; - - spin_lock(&udc->lock); - - stall = __isp1760_udc_set_halt(ep, true); - if (!stall) - isp1760_udc_ctrl_send_status(&udc->ep[0], - USB_DIR_OUT); - - spin_unlock(&udc->lock); - return stall; - } - - default: - return true; - } - break; - - case USB_REQ_SET_ADDRESS: - if (req->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE)) - return true; - - return isp1760_udc_set_address(udc, le16_to_cpu(req->wValue)); - - case USB_REQ_SET_CONFIGURATION: - if (req->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE)) - return true; - - if (udc->gadget.state != USB_STATE_ADDRESS && - udc->gadget.state != USB_STATE_CONFIGURED) - return true; - - stall = udc->driver->setup(&udc->gadget, req) < 0; - if (stall) - return true; - - usb_gadget_set_state(&udc->gadget, req->wValue ? - USB_STATE_CONFIGURED : USB_STATE_ADDRESS); - - /* - * SET_CONFIGURATION (and SET_INTERFACE) must reset the halt - * feature on all endpoints. There is however no need to do so - * explicitly here as the gadget driver will disable and - * reenable endpoints, clearing the halt feature. - */ - return false; - - default: - return udc->driver->setup(&udc->gadget, req) < 0; - } -} - -static void isp1760_ep0_setup(struct isp1760_udc *udc) -{ - union { - struct usb_ctrlrequest r; - u32 data[2]; - } req; - unsigned int count; - bool stall = false; - - spin_lock(&udc->lock); - - isp1760_udc_write(udc, DC_EPINDEX, DC_EP0SETUP); - - count = isp1760_udc_read(udc, DC_BUFLEN) & DC_DATACOUNT_MASK; - if (count != sizeof(req)) { - spin_unlock(&udc->lock); - - dev_err(udc->isp->dev, "invalid length %u for setup packet\n", - count); - - isp1760_udc_ctrl_send_stall(&udc->ep[0]); - return; - } - - req.data[0] = isp1760_udc_read(udc, DC_DATAPORT); - req.data[1] = isp1760_udc_read(udc, DC_DATAPORT); - - if (udc->ep0_state != ISP1760_CTRL_SETUP) { - spin_unlock(&udc->lock); - dev_dbg(udc->isp->dev, "unexpected SETUP packet\n"); - return; - } - - /* Move to the data stage. */ - if (!req.r.wLength) - udc->ep0_state = ISP1760_CTRL_STATUS; - else if (req.r.bRequestType & USB_DIR_IN) - udc->ep0_state = ISP1760_CTRL_DATA_IN; - else - udc->ep0_state = ISP1760_CTRL_DATA_OUT; - - udc->ep0_dir = req.r.bRequestType & USB_DIR_IN; - udc->ep0_length = le16_to_cpu(req.r.wLength); - - spin_unlock(&udc->lock); - - dev_dbg(udc->isp->dev, - "%s: bRequestType 0x%02x bRequest 0x%02x wValue 0x%04x wIndex 0x%04x wLength 0x%04x\n", - __func__, req.r.bRequestType, req.r.bRequest, - le16_to_cpu(req.r.wValue), le16_to_cpu(req.r.wIndex), - le16_to_cpu(req.r.wLength)); - - if ((req.r.bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) - stall = isp1760_ep0_setup_standard(udc, &req.r); - else - stall = udc->driver->setup(&udc->gadget, &req.r) < 0; - - if (stall) - isp1760_udc_ctrl_send_stall(&udc->ep[0]); -} - -/* ----------------------------------------------------------------------------- - * Gadget Endpoint Operations - */ - -static int isp1760_ep_enable(struct usb_ep *ep, - const struct usb_endpoint_descriptor *desc) -{ - struct isp1760_ep *uep = ep_to_udc_ep(ep); - struct isp1760_udc *udc = uep->udc; - unsigned long flags; - unsigned int type; - - dev_dbg(uep->udc->isp->dev, "%s\n", __func__); - - /* - * Validate the descriptor. The control endpoint can't be enabled - * manually. - */ - if (desc->bDescriptorType != USB_DT_ENDPOINT || - desc->bEndpointAddress == 0 || - desc->bEndpointAddress != uep->addr || - le16_to_cpu(desc->wMaxPacketSize) > ep->maxpacket) { - dev_dbg(udc->isp->dev, - "%s: invalid descriptor type %u addr %02x ep addr %02x max packet size %u/%u\n", - __func__, desc->bDescriptorType, - desc->bEndpointAddress, uep->addr, - le16_to_cpu(desc->wMaxPacketSize), ep->maxpacket); - return -EINVAL; - } - - switch (usb_endpoint_type(desc)) { - case USB_ENDPOINT_XFER_ISOC: - type = DC_ENDPTYP_ISOC; - break; - case USB_ENDPOINT_XFER_BULK: - type = DC_ENDPTYP_BULK; - break; - case USB_ENDPOINT_XFER_INT: - type = DC_ENDPTYP_INTERRUPT; - break; - case USB_ENDPOINT_XFER_CONTROL: - default: - dev_dbg(udc->isp->dev, "%s: control endpoints unsupported\n", - __func__); - return -EINVAL; - } - - spin_lock_irqsave(&udc->lock, flags); - - uep->desc = desc; - uep->maxpacket = le16_to_cpu(desc->wMaxPacketSize); - uep->rx_pending = false; - uep->halted = false; - uep->wedged = false; - - isp1760_udc_select_ep(uep); - isp1760_udc_write(udc, DC_EPMAXPKTSZ, uep->maxpacket); - isp1760_udc_write(udc, DC_BUFLEN, uep->maxpacket); - isp1760_udc_write(udc, DC_EPTYPE, DC_EPENABLE | type); - - spin_unlock_irqrestore(&udc->lock, flags); - - return 0; -} - -static int isp1760_ep_disable(struct usb_ep *ep) -{ - struct isp1760_ep *uep = ep_to_udc_ep(ep); - struct isp1760_udc *udc = uep->udc; - struct isp1760_request *req, *nreq; - LIST_HEAD(req_list); - unsigned long flags; - - dev_dbg(udc->isp->dev, "%s\n", __func__); - - spin_lock_irqsave(&udc->lock, flags); - - if (!uep->desc) { - dev_dbg(udc->isp->dev, "%s: endpoint not enabled\n", __func__); - spin_unlock_irqrestore(&udc->lock, flags); - return -EINVAL; - } - - uep->desc = NULL; - uep->maxpacket = 0; - - isp1760_udc_select_ep(uep); - isp1760_udc_write(udc, DC_EPTYPE, 0); - - /* TODO Synchronize with the IRQ handler */ - - list_splice_init(&uep->queue, &req_list); - - spin_unlock_irqrestore(&udc->lock, flags); - - list_for_each_entry_safe(req, nreq, &req_list, queue) { - list_del(&req->queue); - isp1760_udc_request_complete(uep, req, -ESHUTDOWN); - } - - return 0; -} - -static struct usb_request *isp1760_ep_alloc_request(struct usb_ep *ep, - gfp_t gfp_flags) -{ - struct isp1760_request *req; - - req = kzalloc(sizeof(*req), gfp_flags); - - return &req->req; -} - -static void isp1760_ep_free_request(struct usb_ep *ep, struct usb_request *_req) -{ - struct isp1760_request *req = req_to_udc_req(_req); - - kfree(req); -} - -static int isp1760_ep_queue(struct usb_ep *ep, struct usb_request *_req, - gfp_t gfp_flags) -{ - struct isp1760_request *req = req_to_udc_req(_req); - struct isp1760_ep *uep = ep_to_udc_ep(ep); - struct isp1760_udc *udc = uep->udc; - bool complete = false; - unsigned long flags; - int ret = 0; - - _req->status = -EINPROGRESS; - _req->actual = 0; - - spin_lock_irqsave(&udc->lock, flags); - - dev_dbg(udc->isp->dev, - "%s: req %p (%u bytes%s) ep %p(0x%02x)\n", __func__, _req, - _req->length, _req->zero ? " (zlp)" : "", uep, uep->addr); - - req->ep = uep; - - if (uep->addr == 0) { - if (_req->length != udc->ep0_length && - udc->ep0_state != ISP1760_CTRL_DATA_IN) { - dev_dbg(udc->isp->dev, - "%s: invalid length %u for req %p\n", - __func__, _req->length, req); - ret = -EINVAL; - goto done; - } - - switch (udc->ep0_state) { - case ISP1760_CTRL_DATA_IN: - dev_dbg(udc->isp->dev, "%s: transmitting req %p\n", - __func__, req); - - list_add_tail(&req->queue, &uep->queue); - isp1760_udc_transmit(uep, req); - break; - - case ISP1760_CTRL_DATA_OUT: - list_add_tail(&req->queue, &uep->queue); - __isp1760_udc_select_ep(uep, USB_DIR_OUT); - isp1760_udc_write(udc, DC_CTRLFUNC, DC_DSEN); - break; - - case ISP1760_CTRL_STATUS: - complete = true; - break; - - default: - dev_dbg(udc->isp->dev, "%s: invalid ep0 state\n", - __func__); - ret = -EINVAL; - break; - } - } else if (uep->desc) { - bool empty = list_empty(&uep->queue); - - list_add_tail(&req->queue, &uep->queue); - if ((uep->addr & USB_DIR_IN) && !uep->halted && empty) - isp1760_udc_transmit(uep, req); - else if (!(uep->addr & USB_DIR_IN) && uep->rx_pending) - complete = isp1760_udc_receive(uep, req); - } else { - dev_dbg(udc->isp->dev, - "%s: can't queue request to disabled ep%02x\n", - __func__, uep->addr); - ret = -ESHUTDOWN; - } - -done: - if (ret < 0) - req->ep = NULL; - - spin_unlock_irqrestore(&udc->lock, flags); - - if (complete) - isp1760_udc_request_complete(uep, req, 0); - - return ret; -} - -static int isp1760_ep_dequeue(struct usb_ep *ep, struct usb_request *_req) -{ - struct isp1760_request *req = req_to_udc_req(_req); - struct isp1760_ep *uep = ep_to_udc_ep(ep); - struct isp1760_udc *udc = uep->udc; - unsigned long flags; - - dev_dbg(uep->udc->isp->dev, "%s(ep%02x)\n", __func__, uep->addr); - - spin_lock_irqsave(&udc->lock, flags); - - if (req->ep != uep) - req = NULL; - else - list_del(&req->queue); - - spin_unlock_irqrestore(&udc->lock, flags); - - if (!req) - return -EINVAL; - - isp1760_udc_request_complete(uep, req, -ECONNRESET); - return 0; -} - -static int __isp1760_ep_set_halt(struct isp1760_ep *uep, bool stall, bool wedge) -{ - struct isp1760_udc *udc = uep->udc; - int ret; - - if (!uep->addr) { - /* - * Halting the control endpoint is only valid as a delayed error - * response to a SETUP packet. Make sure EP0 is in the right - * stage and that the gadget isn't trying to clear the halt - * condition. - */ - if (WARN_ON(udc->ep0_state == ISP1760_CTRL_SETUP || !stall || - wedge)) { - return -EINVAL; - } - } - - if (uep->addr && !uep->desc) { - dev_dbg(udc->isp->dev, "%s: ep%02x is disabled\n", __func__, - uep->addr); - return -EINVAL; - } - - if (uep->addr & USB_DIR_IN) { - /* Refuse to halt IN endpoints with active transfers. */ - if (!list_empty(&uep->queue)) { - dev_dbg(udc->isp->dev, - "%s: ep%02x has request pending\n", __func__, - uep->addr); - return -EAGAIN; - } - } - - ret = __isp1760_udc_set_halt(uep, stall); - if (ret < 0) - return ret; - - if (!uep->addr) { - /* - * Stalling EP0 completes the control transaction, move back to - * the SETUP state. - */ - udc->ep0_state = ISP1760_CTRL_SETUP; - return 0; - } - - if (wedge) - uep->wedged = true; - else if (!stall) - uep->wedged = false; - - return 0; -} - -static int isp1760_ep_set_halt(struct usb_ep *ep, int value) -{ - struct isp1760_ep *uep = ep_to_udc_ep(ep); - unsigned long flags; - int ret; - - dev_dbg(uep->udc->isp->dev, "%s: %s halt on ep%02x\n", __func__, - value ? "set" : "clear", uep->addr); - - spin_lock_irqsave(&uep->udc->lock, flags); - ret = __isp1760_ep_set_halt(uep, value, false); - spin_unlock_irqrestore(&uep->udc->lock, flags); - - return ret; -} - -static int isp1760_ep_set_wedge(struct usb_ep *ep) -{ - struct isp1760_ep *uep = ep_to_udc_ep(ep); - unsigned long flags; - int ret; - - dev_dbg(uep->udc->isp->dev, "%s: set wedge on ep%02x)\n", __func__, - uep->addr); - - spin_lock_irqsave(&uep->udc->lock, flags); - ret = __isp1760_ep_set_halt(uep, true, true); - spin_unlock_irqrestore(&uep->udc->lock, flags); - - return ret; -} - -static void isp1760_ep_fifo_flush(struct usb_ep *ep) -{ - struct isp1760_ep *uep = ep_to_udc_ep(ep); - struct isp1760_udc *udc = uep->udc; - unsigned long flags; - - spin_lock_irqsave(&udc->lock, flags); - - isp1760_udc_select_ep(uep); - - /* - * Set the CLBUF bit twice to flush both buffers in case double - * buffering is enabled. - */ - isp1760_udc_write(udc, DC_CTRLFUNC, DC_CLBUF); - isp1760_udc_write(udc, DC_CTRLFUNC, DC_CLBUF); - - spin_unlock_irqrestore(&udc->lock, flags); -} - -static const struct usb_ep_ops isp1760_ep_ops = { - .enable = isp1760_ep_enable, - .disable = isp1760_ep_disable, - .alloc_request = isp1760_ep_alloc_request, - .free_request = isp1760_ep_free_request, - .queue = isp1760_ep_queue, - .dequeue = isp1760_ep_dequeue, - .set_halt = isp1760_ep_set_halt, - .set_wedge = isp1760_ep_set_wedge, - .fifo_flush = isp1760_ep_fifo_flush, -}; - -/* ----------------------------------------------------------------------------- - * Device States - */ - -/* Called with the UDC spinlock held. */ -static void isp1760_udc_connect(struct isp1760_udc *udc) -{ - usb_gadget_set_state(&udc->gadget, USB_STATE_POWERED); - mod_timer(&udc->vbus_timer, jiffies + ISP1760_VBUS_POLL_INTERVAL); -} - -/* Called with the UDC spinlock held. */ -static void isp1760_udc_disconnect(struct isp1760_udc *udc) -{ - if (udc->gadget.state < USB_STATE_POWERED) - return; - - dev_dbg(udc->isp->dev, "Device disconnected in state %u\n", - udc->gadget.state); - - udc->gadget.speed = USB_SPEED_UNKNOWN; - usb_gadget_set_state(&udc->gadget, USB_STATE_ATTACHED); - - if (udc->driver->disconnect) - udc->driver->disconnect(&udc->gadget); - - del_timer(&udc->vbus_timer); - - /* TODO Reset all endpoints ? */ -} - -static void isp1760_udc_init_hw(struct isp1760_udc *udc) -{ - /* - * The device controller currently shares its interrupt with the host - * controller, the DC_IRQ polarity and signaling mode are ignored. Set - * the to active-low level-triggered. - * - * Configure the control, in and out pipes to generate interrupts on - * ACK tokens only (and NYET for the out pipe). The default - * configuration also generates an interrupt on the first NACK token. - */ - isp1760_udc_write(udc, DC_INTCONF, DC_CDBGMOD_ACK | DC_DDBGMODIN_ACK | - DC_DDBGMODOUT_ACK_NYET); - - isp1760_udc_write(udc, DC_INTENABLE, DC_IEPRXTX(7) | DC_IEPRXTX(6) | - DC_IEPRXTX(5) | DC_IEPRXTX(4) | DC_IEPRXTX(3) | - DC_IEPRXTX(2) | DC_IEPRXTX(1) | DC_IEPRXTX(0) | - DC_IEP0SETUP | DC_IEVBUS | DC_IERESM | DC_IESUSP | - DC_IEHS_STA | DC_IEBRST); - - if (udc->connected) - isp1760_set_pullup(udc->isp, true); - - isp1760_udc_write(udc, DC_ADDRESS, DC_DEVEN); -} - -static void isp1760_udc_reset(struct isp1760_udc *udc) -{ - unsigned long flags; - - spin_lock_irqsave(&udc->lock, flags); - - /* - * The bus reset has reset most registers to their default value, - * reinitialize the UDC hardware. - */ - isp1760_udc_init_hw(udc); - - udc->ep0_state = ISP1760_CTRL_SETUP; - udc->gadget.speed = USB_SPEED_FULL; - - usb_gadget_udc_reset(&udc->gadget, udc->driver); - - spin_unlock_irqrestore(&udc->lock, flags); -} - -static void isp1760_udc_suspend(struct isp1760_udc *udc) -{ - if (udc->gadget.state < USB_STATE_DEFAULT) - return; - - if (udc->driver->suspend) - udc->driver->suspend(&udc->gadget); -} - -static void isp1760_udc_resume(struct isp1760_udc *udc) -{ - if (udc->gadget.state < USB_STATE_DEFAULT) - return; - - if (udc->driver->resume) - udc->driver->resume(&udc->gadget); -} - -/* ----------------------------------------------------------------------------- - * Gadget Operations - */ - -static int isp1760_udc_get_frame(struct usb_gadget *gadget) -{ - struct isp1760_udc *udc = gadget_to_udc(gadget); - - return isp1760_udc_read(udc, DC_FRAMENUM) & ((1 << 11) - 1); -} - -static int isp1760_udc_wakeup(struct usb_gadget *gadget) -{ - struct isp1760_udc *udc = gadget_to_udc(gadget); - - dev_dbg(udc->isp->dev, "%s\n", __func__); - return -ENOTSUPP; -} - -static int isp1760_udc_set_selfpowered(struct usb_gadget *gadget, - int is_selfpowered) -{ - struct isp1760_udc *udc = gadget_to_udc(gadget); - - if (is_selfpowered) - udc->devstatus |= 1 << USB_DEVICE_SELF_POWERED; - else - udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED); - - return 0; -} - -static int isp1760_udc_pullup(struct usb_gadget *gadget, int is_on) -{ - struct isp1760_udc *udc = gadget_to_udc(gadget); - - isp1760_set_pullup(udc->isp, is_on); - udc->connected = is_on; - - return 0; -} - -static int isp1760_udc_start(struct usb_gadget *gadget, - struct usb_gadget_driver *driver) -{ - struct isp1760_udc *udc = gadget_to_udc(gadget); - - /* The hardware doesn't support low speed. */ - if (driver->max_speed < USB_SPEED_FULL) { - dev_err(udc->isp->dev, "Invalid gadget driver\n"); - return -EINVAL; - } - - spin_lock(&udc->lock); - - if (udc->driver) { - dev_err(udc->isp->dev, "UDC already has a gadget driver\n"); - spin_unlock(&udc->lock); - return -EBUSY; - } - - udc->driver = driver; - - spin_unlock(&udc->lock); - - dev_dbg(udc->isp->dev, "starting UDC with driver %s\n", - driver->function); - - udc->devstatus = 0; - udc->connected = true; - - usb_gadget_set_state(&udc->gadget, USB_STATE_ATTACHED); - - /* DMA isn't supported yet, don't enable the DMA clock. */ - isp1760_udc_write(udc, DC_MODE, DC_GLINTENA); - - isp1760_udc_init_hw(udc); - - dev_dbg(udc->isp->dev, "UDC started with driver %s\n", - driver->function); - - return 0; -} - -static int isp1760_udc_stop(struct usb_gadget *gadget) -{ - struct isp1760_udc *udc = gadget_to_udc(gadget); - - dev_dbg(udc->isp->dev, "%s\n", __func__); - - del_timer_sync(&udc->vbus_timer); - - isp1760_udc_write(udc, DC_MODE, 0); - - spin_lock(&udc->lock); - udc->driver = NULL; - spin_unlock(&udc->lock); - - return 0; -} - -static struct usb_gadget_ops isp1760_udc_ops = { - .get_frame = isp1760_udc_get_frame, - .wakeup = isp1760_udc_wakeup, - .set_selfpowered = isp1760_udc_set_selfpowered, - .pullup = isp1760_udc_pullup, - .udc_start = isp1760_udc_start, - .udc_stop = isp1760_udc_stop, -}; - -/* ----------------------------------------------------------------------------- - * Interrupt Handling - */ - -static irqreturn_t isp1760_udc_irq(int irq, void *dev) -{ - struct isp1760_udc *udc = dev; - unsigned int i; - u32 status; - - status = isp1760_udc_read(udc, DC_INTERRUPT) - & isp1760_udc_read(udc, DC_INTENABLE); - isp1760_udc_write(udc, DC_INTERRUPT, status); - - if (status & DC_IEVBUS) { - dev_dbg(udc->isp->dev, "%s(VBUS)\n", __func__); - /* The VBUS interrupt is only triggered when VBUS appears. */ - spin_lock(&udc->lock); - isp1760_udc_connect(udc); - spin_unlock(&udc->lock); - } - - if (status & DC_IEBRST) { - dev_dbg(udc->isp->dev, "%s(BRST)\n", __func__); - - isp1760_udc_reset(udc); - } - - for (i = 0; i <= 7; ++i) { - struct isp1760_ep *ep = &udc->ep[i*2]; - - if (status & DC_IEPTX(i)) { - dev_dbg(udc->isp->dev, "%s(EPTX%u)\n", __func__, i); - isp1760_ep_tx_complete(ep); - } - - if (status & DC_IEPRX(i)) { - dev_dbg(udc->isp->dev, "%s(EPRX%u)\n", __func__, i); - isp1760_ep_rx_ready(i ? ep - 1 : ep); - } - } - - if (status & DC_IEP0SETUP) { - dev_dbg(udc->isp->dev, "%s(EP0SETUP)\n", __func__); - - isp1760_ep0_setup(udc); - } - - if (status & DC_IERESM) { - dev_dbg(udc->isp->dev, "%s(RESM)\n", __func__); - isp1760_udc_resume(udc); - } - - if (status & DC_IESUSP) { - dev_dbg(udc->isp->dev, "%s(SUSP)\n", __func__); - - spin_lock(&udc->lock); - if (!(isp1760_udc_read(udc, DC_MODE) & DC_VBUSSTAT)) - isp1760_udc_disconnect(udc); - else - isp1760_udc_suspend(udc); - spin_unlock(&udc->lock); - } - - if (status & DC_IEHS_STA) { - dev_dbg(udc->isp->dev, "%s(HS_STA)\n", __func__); - udc->gadget.speed = USB_SPEED_HIGH; - } - - return status ? IRQ_HANDLED : IRQ_NONE; -} - -static void isp1760_udc_vbus_poll(unsigned long data) -{ - struct isp1760_udc *udc = (struct isp1760_udc *)data; - unsigned long flags; - - spin_lock_irqsave(&udc->lock, flags); - - if (!(isp1760_udc_read(udc, DC_MODE) & DC_VBUSSTAT)) - isp1760_udc_disconnect(udc); - else if (udc->gadget.state >= USB_STATE_POWERED) - mod_timer(&udc->vbus_timer, - jiffies + ISP1760_VBUS_POLL_INTERVAL); - - spin_unlock_irqrestore(&udc->lock, flags); -} - -/* ----------------------------------------------------------------------------- - * Registration - */ - -static void isp1760_udc_init_eps(struct isp1760_udc *udc) -{ - unsigned int i; - - INIT_LIST_HEAD(&udc->gadget.ep_list); - - for (i = 0; i < ARRAY_SIZE(udc->ep); ++i) { - struct isp1760_ep *ep = &udc->ep[i]; - unsigned int ep_num = (i + 1) / 2; - bool is_in = !(i & 1); - - ep->udc = udc; - - INIT_LIST_HEAD(&ep->queue); - - ep->addr = (ep_num && is_in ? USB_DIR_IN : USB_DIR_OUT) - | ep_num; - ep->desc = NULL; - - sprintf(ep->name, "ep%u%s", ep_num, - ep_num ? (is_in ? "in" : "out") : ""); - - ep->ep.ops = &isp1760_ep_ops; - ep->ep.name = ep->name; - - /* - * Hardcode the maximum packet sizes for now, to 64 bytes for - * the control endpoint and 512 bytes for all other endpoints. - * This fits in the 8kB FIFO without double-buffering. - */ - if (ep_num == 0) { - ep->ep.maxpacket = 64; - ep->maxpacket = 64; - udc->gadget.ep0 = &ep->ep; - } else { - ep->ep.maxpacket = 512; - ep->maxpacket = 0; - list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list); - } - } -} - -static int isp1760_udc_init(struct isp1760_udc *udc) -{ - u16 scratch; - u32 chipid; - - /* - * Check that the controller is present by writing to the scratch - * register, modifying the bus pattern by reading from the chip ID - * register, and reading the scratch register value back. The chip ID - * and scratch register contents must match the expected values. - */ - isp1760_udc_write(udc, DC_SCRATCH, 0xbabe); - chipid = isp1760_udc_read(udc, DC_CHIPID); - scratch = isp1760_udc_read(udc, DC_SCRATCH); - - if (scratch != 0xbabe) { - dev_err(udc->isp->dev, - "udc: scratch test failed (0x%04x/0x%08x)\n", - scratch, chipid); - return -ENODEV; - } - - if (chipid != 0x00011582) { - dev_err(udc->isp->dev, "udc: invalid chip ID 0x%08x\n", chipid); - return -ENODEV; - } - - /* Reset the device controller. */ - isp1760_udc_write(udc, DC_MODE, DC_SFRESET); - usleep_range(10000, 11000); - isp1760_udc_write(udc, DC_MODE, 0); - usleep_range(10000, 11000); - - return 0; -} - -int isp1760_udc_register(struct isp1760_device *isp, int irq, - unsigned long irqflags) -{ - struct isp1760_udc *udc = &isp->udc; - const char *devname; - int ret; - - udc->irq = -1; - udc->isp = isp; - udc->regs = isp->regs; - - spin_lock_init(&udc->lock); - setup_timer(&udc->vbus_timer, isp1760_udc_vbus_poll, - (unsigned long)udc); - - ret = isp1760_udc_init(udc); - if (ret < 0) - return ret; - - devname = dev_name(isp->dev); - udc->irqname = kmalloc(strlen(devname) + 7, GFP_KERNEL); - if (!udc->irqname) - return -ENOMEM; - - sprintf(udc->irqname, "%s (udc)", devname); - - ret = request_irq(irq, isp1760_udc_irq, IRQF_SHARED | IRQF_DISABLED | - irqflags, udc->irqname, udc); - if (ret < 0) - goto error; - - udc->irq = irq; - - /* - * Initialize the gadget static fields and register its device. Gadget - * fields that vary during the life time of the gadget are initialized - * by the UDC core. - */ - udc->gadget.ops = &isp1760_udc_ops; - udc->gadget.speed = USB_SPEED_UNKNOWN; - udc->gadget.max_speed = USB_SPEED_HIGH; - udc->gadget.name = "isp1761_udc"; - - isp1760_udc_init_eps(udc); - - ret = usb_add_gadget_udc(isp->dev, &udc->gadget); - if (ret < 0) - goto error; - - return 0; - -error: - if (udc->irq >= 0) - free_irq(udc->irq, udc); - kfree(udc->irqname); - - return ret; -} - -void isp1760_udc_unregister(struct isp1760_device *isp) -{ - struct isp1760_udc *udc = &isp->udc; - - usb_del_gadget_udc(&udc->gadget); - - free_irq(udc->irq, udc); - kfree(udc->irqname); -} |
