| /* |
| * Renesas USB driver |
| * |
| * Copyright (C) 2011 Renesas Solutions Corp. |
| * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| * |
| */ |
| #include <linux/io.h> |
| #include <linux/module.h> |
| #include <linux/platform_device.h> |
| #include <linux/usb/ch9.h> |
| #include <linux/usb/gadget.h> |
| #include "common.h" |
| |
| /* |
| * struct |
| */ |
| struct usbhsg_request { |
| struct usb_request req; |
| struct list_head node; |
| }; |
| |
| #define EP_NAME_SIZE 8 |
| struct usbhsg_gpriv; |
| struct usbhsg_pipe_handle; |
| struct usbhsg_uep { |
| struct usb_ep ep; |
| struct usbhs_pipe *pipe; |
| struct list_head list; |
| |
| char ep_name[EP_NAME_SIZE]; |
| |
| struct usbhsg_gpriv *gpriv; |
| struct usbhsg_pipe_handle *handler; |
| }; |
| |
| struct usbhsg_gpriv { |
| struct usb_gadget gadget; |
| struct usbhs_mod mod; |
| |
| struct usbhsg_uep *uep; |
| int uep_size; |
| |
| struct usb_gadget_driver *driver; |
| |
| u32 status; |
| #define USBHSG_STATUS_STARTED (1 << 0) |
| #define USBHSG_STATUS_REGISTERD (1 << 1) |
| #define USBHSG_STATUS_WEDGE (1 << 2) |
| }; |
| |
| struct usbhsg_pipe_handle { |
| int (*prepare)(struct usbhsg_uep *uep, struct usbhsg_request *ureq); |
| int (*try_run)(struct usbhsg_uep *uep, struct usbhsg_request *ureq); |
| void (*irq_mask)(struct usbhsg_uep *uep, int enable); |
| }; |
| |
| struct usbhsg_recip_handle { |
| char *name; |
| int (*device)(struct usbhs_priv *priv, struct usbhsg_uep *uep, |
| struct usb_ctrlrequest *ctrl); |
| int (*interface)(struct usbhs_priv *priv, struct usbhsg_uep *uep, |
| struct usb_ctrlrequest *ctrl); |
| int (*endpoint)(struct usbhs_priv *priv, struct usbhsg_uep *uep, |
| struct usb_ctrlrequest *ctrl); |
| }; |
| |
| /* |
| * macro |
| */ |
| #define usbhsg_priv_to_gpriv(priv) \ |
| container_of( \ |
| usbhs_mod_get(priv, USBHS_GADGET), \ |
| struct usbhsg_gpriv, mod) |
| |
| #define __usbhsg_for_each_uep(start, pos, g, i) \ |
| for (i = start, pos = (g)->uep; \ |
| i < (g)->uep_size; \ |
| i++, pos = (g)->uep + i) |
| |
| #define usbhsg_for_each_uep(pos, gpriv, i) \ |
| __usbhsg_for_each_uep(1, pos, gpriv, i) |
| |
| #define usbhsg_for_each_uep_with_dcp(pos, gpriv, i) \ |
| __usbhsg_for_each_uep(0, pos, gpriv, i) |
| |
| #define usbhsg_gadget_to_gpriv(g)\ |
| container_of(g, struct usbhsg_gpriv, gadget) |
| |
| #define usbhsg_req_to_ureq(r)\ |
| container_of(r, struct usbhsg_request, req) |
| |
| #define usbhsg_ep_to_uep(e) container_of(e, struct usbhsg_uep, ep) |
| #define usbhsg_gpriv_to_lock(gp) usbhs_priv_to_lock((gp)->mod.priv) |
| #define usbhsg_gpriv_to_dev(gp) usbhs_priv_to_dev((gp)->mod.priv) |
| #define usbhsg_gpriv_to_priv(gp) ((gp)->mod.priv) |
| #define usbhsg_gpriv_to_dcp(gp) ((gp)->uep) |
| #define usbhsg_gpriv_to_nth_uep(gp, i) ((gp)->uep + i) |
| #define usbhsg_uep_to_gpriv(u) ((u)->gpriv) |
| #define usbhsg_uep_to_pipe(u) ((u)->pipe) |
| #define usbhsg_pipe_to_uep(p) ((p)->mod_private) |
| #define usbhsg_is_dcp(u) ((u) == usbhsg_gpriv_to_dcp((u)->gpriv)) |
| |
| #define usbhsg_is_not_connected(gp) ((gp)->gadget.speed == USB_SPEED_UNKNOWN) |
| |
| /* status */ |
| #define usbhsg_status_init(gp) do {(gp)->status = 0; } while (0) |
| #define usbhsg_status_set(gp, b) (gp->status |= b) |
| #define usbhsg_status_clr(gp, b) (gp->status &= ~b) |
| #define usbhsg_status_has(gp, b) (gp->status & b) |
| |
| /* |
| * list push/pop |
| */ |
| static void usbhsg_queue_push(struct usbhsg_uep *uep, |
| struct usbhsg_request *ureq) |
| { |
| struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep); |
| struct device *dev = usbhsg_gpriv_to_dev(gpriv); |
| struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep); |
| |
| /* |
| ********* assume under spin lock ********* |
| */ |
| list_del_init(&ureq->node); |
| list_add_tail(&ureq->node, &uep->list); |
| ureq->req.actual = 0; |
| ureq->req.status = -EINPROGRESS; |
| |
| dev_dbg(dev, "pipe %d : queue push (%d)\n", |
| usbhs_pipe_number(pipe), |
| ureq->req.length); |
| } |
| |
| static struct usbhsg_request *usbhsg_queue_get(struct usbhsg_uep *uep) |
| { |
| /* |
| ********* assume under spin lock ********* |
| */ |
| if (list_empty(&uep->list)) |
| return NULL; |
| |
| return list_entry(uep->list.next, struct usbhsg_request, node); |
| } |
| |
| #define usbhsg_queue_prepare(uep) __usbhsg_queue_handler(uep, 1); |
| #define usbhsg_queue_handle(uep) __usbhsg_queue_handler(uep, 0); |
| static int __usbhsg_queue_handler(struct usbhsg_uep *uep, int prepare) |
| { |
| struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep); |
| struct device *dev = usbhsg_gpriv_to_dev(gpriv); |
| struct usbhsg_request *ureq; |
| spinlock_t *lock = usbhsg_gpriv_to_lock(gpriv); |
| unsigned long flags; |
| int is_locked; |
| int ret = 0; |
| |
| if (!uep->handler) { |
| dev_err(dev, "no handler function\n"); |
| return -EIO; |
| } |
| |
| /* |
| * CAUTION [*queue handler*] |
| * |
| * This function will be called for start/restart queue operation. |
| * OTOH the most much worry for USB driver is spinlock nest. |
| * Specially it are |
| * - usb_ep_ops :: queue |
| * - usb_request :: complete |
| * |
| * But the caller of this function need not care about spinlock. |
| * This function is using spin_trylock_irqsave for it. |
| * if "is_locked" is 1, this mean this function lock it. |
| * but if it is 0, this mean it is already under spin lock. |
| * see also |
| * CAUTION [*endpoint queue*] |
| * CAUTION [*request complete*] |
| */ |
| |
| /****************** spin try lock *******************/ |
| is_locked = spin_trylock_irqsave(lock, flags); |
| ureq = usbhsg_queue_get(uep); |
| if (ureq) { |
| if (prepare) |
| ret = uep->handler->prepare(uep, ureq); |
| else |
| ret = uep->handler->try_run(uep, ureq); |
| } |
| if (is_locked) |
| spin_unlock_irqrestore(lock, flags); |
| /******************** spin unlock ******************/ |
| |
| return ret; |
| } |
| |
| static void usbhsg_queue_pop(struct usbhsg_uep *uep, |
| struct usbhsg_request *ureq, |
| int status) |
| { |
| struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep); |
| struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep); |
| struct device *dev = usbhsg_gpriv_to_dev(gpriv); |
| |
| /* |
| ********* assume under spin lock ********* |
| */ |
| |
| /* |
| * CAUTION [*request complete*] |
| * |
| * There is a possibility not to be called in correct order |
| * if "complete" is called without spinlock. |
| * |
| * So, this function assume it is under spinlock, |
| * and call usb_request :: complete. |
| * |
| * But this "complete" will push next usb_request. |
| * It mean "usb_ep_ops :: queue" which is using spinlock is called |
| * under spinlock. |
| * |
| * To avoid dead-lock, this driver is using spin_trylock. |
| * CAUTION [*endpoint queue*] |
| * CAUTION [*queue handler*] |
| */ |
| |
| dev_dbg(dev, "pipe %d : queue pop\n", usbhs_pipe_number(pipe)); |
| |
| list_del_init(&ureq->node); |
| |
| ureq->req.status = status; |
| ureq->req.complete(&uep->ep, &ureq->req); |
| |
| /* more request ? */ |
| if (0 == status) |
| usbhsg_queue_prepare(uep); |
| } |
| |
| /* |
| * irq enable/disable function |
| */ |
| #define usbhsg_irq_callback_ctrl(uep, status, enable) \ |
| ({ \ |
| struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep); \ |
| struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep); \ |
| struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv); \ |
| struct usbhs_mod *mod = usbhs_mod_get_current(priv); \ |
| if (!mod) \ |
| return; \ |
| if (enable) \ |
| mod->irq_##status |= (1 << usbhs_pipe_number(pipe)); \ |
| else \ |
| mod->irq_##status &= ~(1 << usbhs_pipe_number(pipe)); \ |
| usbhs_irq_callback_update(priv, mod); \ |
| }) |
| |
| static void usbhsg_irq_empty_ctrl(struct usbhsg_uep *uep, int enable) |
| { |
| usbhsg_irq_callback_ctrl(uep, bempsts, enable); |
| } |
| |
| static void usbhsg_irq_ready_ctrl(struct usbhsg_uep *uep, int enable) |
| { |
| usbhsg_irq_callback_ctrl(uep, brdysts, enable); |
| } |
| |
| /* |
| * handler function |
| */ |
| static int usbhsg_try_run_ctrl_stage_end(struct usbhsg_uep *uep, |
| struct usbhsg_request *ureq) |
| { |
| struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep); |
| |
| /* |
| ********* assume under spin lock ********* |
| */ |
| |
| usbhs_dcp_control_transfer_done(pipe); |
| usbhsg_queue_pop(uep, ureq, 0); |
| |
| return 0; |
| } |
| |
| static int usbhsg_try_run_send_packet(struct usbhsg_uep *uep, |
| struct usbhsg_request *ureq) |
| { |
| struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep); |
| struct usb_request *req = &ureq->req; |
| struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep); |
| struct device *dev = usbhsg_gpriv_to_dev(gpriv); |
| void *buf; |
| int remainder, send; |
| int is_done = 0; |
| int enable; |
| int maxp; |
| |
| /* |
| ********* assume under spin lock ********* |
| */ |
| |
| maxp = usbhs_pipe_get_maxpacket(pipe); |
| buf = req->buf + req->actual; |
| remainder = req->length - req->actual; |
| |
| send = usbhs_fifo_write(pipe, buf, remainder); |
| |
| /* |
| * send < 0 : pipe busy |
| * send = 0 : send zero packet |
| * send > 0 : send data |
| * |
| * send <= max_packet |
| */ |
| if (send > 0) |
| req->actual += send; |
| |
| /* send all packet ? */ |
| if (send < remainder) |
| is_done = 0; /* there are remainder data */ |
| else if (send < maxp) |
| is_done = 1; /* short packet */ |
| else |
| is_done = !req->zero; /* send zero packet ? */ |
| |
| dev_dbg(dev, " send %d (%d/ %d/ %d/ %d)\n", |
| usbhs_pipe_number(pipe), |
| remainder, send, is_done, req->zero); |
| |
| /* |
| * enable interrupt and send again in irq handler |
| * if it still have remainder data which should be sent. |
| */ |
| enable = !is_done; |
| uep->handler->irq_mask(uep, enable); |
| |
| /* |
| * usbhs_fifo_enable execute |
| * - after callback_update, |
| * - before queue_pop / stage_end |
| */ |
| usbhs_fifo_enable(pipe); |
| |
| /* |
| * all data were sent ? |
| */ |
| if (is_done) { |
| /* it care below call in |
| "function mode" */ |
| if (usbhsg_is_dcp(uep)) |
| usbhs_dcp_control_transfer_done(pipe); |
| |
| usbhsg_queue_pop(uep, ureq, 0); |
| } |
| |
| return 0; |
| } |
| |
| static int usbhsg_prepare_send_packet(struct usbhsg_uep *uep, |
| struct usbhsg_request *ureq) |
| { |
| struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep); |
| |
| /* |
| ********* assume under spin lock ********* |
| */ |
| |
| usbhs_fifo_prepare_write(pipe); |
| usbhsg_try_run_send_packet(uep, ureq); |
| |
| return 0; |
| } |
| |
| static int usbhsg_try_run_receive_packet(struct usbhsg_uep *uep, |
| struct usbhsg_request *ureq) |
| { |
| struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep); |
| struct usb_request *req = &ureq->req; |
| struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep); |
| struct device *dev = usbhsg_gpriv_to_dev(gpriv); |
| void *buf; |
| int maxp; |
| int remainder, recv; |
| int is_done = 0; |
| |
| /* |
| ********* assume under spin lock ********* |
| */ |
| |
| maxp = usbhs_pipe_get_maxpacket(pipe); |
| buf = req->buf + req->actual; |
| remainder = req->length - req->actual; |
| |
| recv = usbhs_fifo_read(pipe, buf, remainder); |
| /* |
| * recv < 0 : pipe busy |
| * recv >= 0 : receive data |
| * |
| * recv <= max_packet |
| */ |
| if (recv < 0) |
| return -EBUSY; |
| |
| /* update parameters */ |
| req->actual += recv; |
| |
| if ((recv == remainder) || /* receive all data */ |
| (recv < maxp)) /* short packet */ |
| is_done = 1; |
| |
| dev_dbg(dev, " recv %d (%d/ %d/ %d/ %d)\n", |
| usbhs_pipe_number(pipe), |
| remainder, recv, is_done, req->zero); |
| |
| /* read all data ? */ |
| if (is_done) { |
| int disable = 0; |
| |
| uep->handler->irq_mask(uep, disable); |
| usbhs_fifo_disable(pipe); |
| usbhsg_queue_pop(uep, ureq, 0); |
| } |
| |
| return 0; |
| } |
| |
| static int usbhsg_prepare_receive_packet(struct usbhsg_uep *uep, |
| struct usbhsg_request *ureq) |
| { |
| struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep); |
| int enable = 1; |
| int ret; |
| |
| /* |
| ********* assume under spin lock ********* |
| */ |
| |
| ret = usbhs_fifo_prepare_read(pipe); |
| if (ret < 0) |
| return ret; |
| |
| /* |
| * data will be read in interrupt handler |
| */ |
| uep->handler->irq_mask(uep, enable); |
| |
| return ret; |
| } |
| |
| static struct usbhsg_pipe_handle usbhsg_handler_send_by_empty = { |
| .prepare = usbhsg_prepare_send_packet, |
| .try_run = usbhsg_try_run_send_packet, |
| .irq_mask = usbhsg_irq_empty_ctrl, |
| }; |
| |
| static struct usbhsg_pipe_handle usbhsg_handler_send_by_ready = { |
| .prepare = usbhsg_prepare_send_packet, |
| .try_run = usbhsg_try_run_send_packet, |
| .irq_mask = usbhsg_irq_ready_ctrl, |
| }; |
| |
| static struct usbhsg_pipe_handle usbhsg_handler_recv_by_ready = { |
| .prepare = usbhsg_prepare_receive_packet, |
| .try_run = usbhsg_try_run_receive_packet, |
| .irq_mask = usbhsg_irq_ready_ctrl, |
| }; |
| |
| static struct usbhsg_pipe_handle usbhsg_handler_ctrl_stage_end = { |
| .prepare = usbhsg_try_run_ctrl_stage_end, |
| .try_run = usbhsg_try_run_ctrl_stage_end, |
| }; |
| |
| /* |
| * DCP pipe can NOT use "ready interrupt" for "send" |
| * it should use "empty" interrupt. |
| * see |
| * "Operation" - "Interrupt Function" - "BRDY Interrupt" |
| * |
| * on the other hand, normal pipe can use "ready interrupt" for "send" |
| * even though it is single/double buffer |
| */ |
| #define usbhsg_handler_send_ctrl usbhsg_handler_send_by_empty |
| #define usbhsg_handler_recv_ctrl usbhsg_handler_recv_by_ready |
| |
| #define usbhsg_handler_send_packet usbhsg_handler_send_by_ready |
| #define usbhsg_handler_recv_packet usbhsg_handler_recv_by_ready |
| |
| /* |
| * USB_TYPE_STANDARD / clear feature functions |
| */ |
| static int usbhsg_recip_handler_std_control_done(struct usbhs_priv *priv, |
| struct usbhsg_uep *uep, |
| struct usb_ctrlrequest *ctrl) |
| { |
| struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv); |
| struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv); |
| struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp); |
| |
| usbhs_dcp_control_transfer_done(pipe); |
| |
| return 0; |
| } |
| |
| static int usbhsg_recip_handler_std_clear_endpoint(struct usbhs_priv *priv, |
| struct usbhsg_uep *uep, |
| struct usb_ctrlrequest *ctrl) |
| { |
| struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep); |
| struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep); |
| |
| if (!usbhsg_status_has(gpriv, USBHSG_STATUS_WEDGE)) { |
| usbhs_fifo_disable(pipe); |
| usbhs_pipe_clear_sequence(pipe); |
| usbhs_fifo_enable(pipe); |
| } |
| |
| usbhsg_recip_handler_std_control_done(priv, uep, ctrl); |
| |
| usbhsg_queue_prepare(uep); |
| |
| return 0; |
| } |
| |
| struct usbhsg_recip_handle req_clear_feature = { |
| .name = "clear feature", |
| .device = usbhsg_recip_handler_std_control_done, |
| .interface = usbhsg_recip_handler_std_control_done, |
| .endpoint = usbhsg_recip_handler_std_clear_endpoint, |
| }; |
| |
| /* |
| * USB_TYPE handler |
| */ |
| static int usbhsg_recip_run_handle(struct usbhs_priv *priv, |
| struct usbhsg_recip_handle *handler, |
| struct usb_ctrlrequest *ctrl) |
| { |
| struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv); |
| struct device *dev = usbhsg_gpriv_to_dev(gpriv); |
| struct usbhsg_uep *uep; |
| int recip = ctrl->bRequestType & USB_RECIP_MASK; |
| int nth = le16_to_cpu(ctrl->wIndex) & USB_ENDPOINT_NUMBER_MASK; |
| int ret; |
| int (*func)(struct usbhs_priv *priv, struct usbhsg_uep *uep, |
| struct usb_ctrlrequest *ctrl); |
| char *msg; |
| |
| uep = usbhsg_gpriv_to_nth_uep(gpriv, nth); |
| |
| switch (recip) { |
| case USB_RECIP_DEVICE: |
| msg = "DEVICE"; |
| func = handler->device; |
| break; |
| case USB_RECIP_INTERFACE: |
| msg = "INTERFACE"; |
| func = handler->interface; |
| break; |
| case USB_RECIP_ENDPOINT: |
| msg = "ENDPOINT"; |
| func = handler->endpoint; |
| break; |
| default: |
| dev_warn(dev, "unsupported RECIP(%d)\n", recip); |
| func = NULL; |
| ret = -EINVAL; |
| } |
| |
| if (func) { |
| dev_dbg(dev, "%s (pipe %d :%s)\n", handler->name, nth, msg); |
| ret = func(priv, uep, ctrl); |
| } |
| |
| return ret; |
| } |
| |
| /* |
| * irq functions |
| * |
| * it will be called from usbhs_interrupt |
| */ |
| static int usbhsg_irq_dev_state(struct usbhs_priv *priv, |
| struct usbhs_irq_state *irq_state) |
| { |
| struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv); |
| struct device *dev = usbhsg_gpriv_to_dev(gpriv); |
| |
| gpriv->gadget.speed = usbhs_status_get_usb_speed(irq_state); |
| |
| dev_dbg(dev, "state = %x : speed : %d\n", |
| usbhs_status_get_device_state(irq_state), |
| gpriv->gadget.speed); |
| |
| return 0; |
| } |
| |
| static int usbhsg_irq_ctrl_stage(struct usbhs_priv *priv, |
| struct usbhs_irq_state *irq_state) |
| { |
| struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv); |
| struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv); |
| struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp); |
| struct device *dev = usbhsg_gpriv_to_dev(gpriv); |
| struct usb_ctrlrequest ctrl; |
| struct usbhsg_recip_handle *recip_handler = NULL; |
| int stage = usbhs_status_get_ctrl_stage(irq_state); |
| int ret = 0; |
| |
| dev_dbg(dev, "stage = %d\n", stage); |
| |
| /* |
| * see Manual |
| * |
| * "Operation" |
| * - "Interrupt Function" |
| * - "Control Transfer Stage Transition Interrupt" |
| * - Fig. "Control Transfer Stage Transitions" |
| */ |
| |
| switch (stage) { |
| case READ_DATA_STAGE: |
| dcp->handler = &usbhsg_handler_send_ctrl; |
| break; |
| case WRITE_DATA_STAGE: |
| dcp->handler = &usbhsg_handler_recv_ctrl; |
| break; |
| case NODATA_STATUS_STAGE: |
| dcp->handler = &usbhsg_handler_ctrl_stage_end; |
| break; |
| default: |
| return ret; |
| } |
| |
| /* |
| * get usb request |
| */ |
| usbhs_usbreq_get_val(priv, &ctrl); |
| |
| switch (ctrl.bRequestType & USB_TYPE_MASK) { |
| case USB_TYPE_STANDARD: |
| switch (ctrl.bRequest) { |
| case USB_REQ_CLEAR_FEATURE: |
| recip_handler = &req_clear_feature; |
| break; |
| } |
| } |
| |
| /* |
| * setup stage / run recip |
| */ |
| if (recip_handler) |
| ret = usbhsg_recip_run_handle(priv, recip_handler, &ctrl); |
| else |
| ret = gpriv->driver->setup(&gpriv->gadget, &ctrl); |
| |
| if (ret < 0) |
| usbhs_fifo_stall(pipe); |
| |
| return ret; |
| } |
| |
| static int usbhsg_irq_empty(struct usbhs_priv *priv, |
| struct usbhs_irq_state *irq_state) |
| { |
| struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv); |
| struct usbhsg_uep *uep; |
| struct usbhs_pipe *pipe; |
| struct device *dev = usbhsg_gpriv_to_dev(gpriv); |
| int i, ret; |
| |
| if (!irq_state->bempsts) { |
| dev_err(dev, "debug %s !!\n", __func__); |
| return -EIO; |
| } |
| |
| dev_dbg(dev, "irq empty [0x%04x]\n", irq_state->bempsts); |
| |
| /* |
| * search interrupted "pipe" |
| * not "uep". |
| */ |
| usbhs_for_each_pipe_with_dcp(pipe, priv, i) { |
| if (!(irq_state->bempsts & (1 << i))) |
| continue; |
| |
| uep = usbhsg_pipe_to_uep(pipe); |
| ret = usbhsg_queue_handle(uep); |
| if (ret < 0) |
| dev_err(dev, "send error %d : %d\n", i, ret); |
| } |
| |
| return 0; |
| } |
| |
| static int usbhsg_irq_ready(struct usbhs_priv *priv, |
| struct usbhs_irq_state *irq_state) |
| { |
| struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv); |
| struct usbhsg_uep *uep; |
| struct usbhs_pipe *pipe; |
| struct device *dev = usbhsg_gpriv_to_dev(gpriv); |
| int i, ret; |
| |
| if (!irq_state->brdysts) { |
| dev_err(dev, "debug %s !!\n", __func__); |
| return -EIO; |
| } |
| |
| dev_dbg(dev, "irq ready [0x%04x]\n", irq_state->brdysts); |
| |
| /* |
| * search interrupted "pipe" |
| * not "uep". |
| */ |
| usbhs_for_each_pipe_with_dcp(pipe, priv, i) { |
| if (!(irq_state->brdysts & (1 << i))) |
| continue; |
| |
| uep = usbhsg_pipe_to_uep(pipe); |
| ret = usbhsg_queue_handle(uep); |
| if (ret < 0) |
| dev_err(dev, "receive error %d : %d\n", i, ret); |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * |
| * usb_dcp_ops |
| * |
| */ |
| static int usbhsg_dcp_enable(struct usbhsg_uep *uep) |
| { |
| struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep); |
| struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv); |
| struct usbhs_pipe *pipe; |
| |
| /* |
| ********* assume under spin lock ********* |
| */ |
| |
| pipe = usbhs_dcp_malloc(priv); |
| if (!pipe) |
| return -EIO; |
| |
| uep->pipe = pipe; |
| uep->pipe->mod_private = uep; |
| INIT_LIST_HEAD(&uep->list); |
| |
| return 0; |
| } |
| |
| #define usbhsg_dcp_disable usbhsg_pipe_disable |
| static int usbhsg_pipe_disable(struct usbhsg_uep *uep) |
| { |
| struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep); |
| struct usbhsg_request *ureq; |
| int disable = 0; |
| |
| /* |
| ********* assume under spin lock ********* |
| */ |
| |
| usbhs_fifo_disable(pipe); |
| |
| /* |
| * disable pipe irq |
| */ |
| usbhsg_irq_empty_ctrl(uep, disable); |
| usbhsg_irq_ready_ctrl(uep, disable); |
| |
| while (1) { |
| ureq = usbhsg_queue_get(uep); |
| if (!ureq) |
| break; |
| |
| usbhsg_queue_pop(uep, ureq, -ECONNRESET); |
| } |
| |
| return 0; |
| } |
| |
| static void usbhsg_uep_init(struct usbhsg_gpriv *gpriv) |
| { |
| int i; |
| struct usbhsg_uep *uep; |
| |
| usbhsg_for_each_uep_with_dcp(uep, gpriv, i) |
| uep->pipe = NULL; |
| } |
| |
| /* |
| * |
| * usb_ep_ops |
| * |
| */ |
| static int usbhsg_ep_enable(struct usb_ep *ep, |
| const struct usb_endpoint_descriptor *desc) |
| { |
| struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep); |
| struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep); |
| struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv); |
| struct usbhs_pipe *pipe; |
| spinlock_t *lock = usbhsg_gpriv_to_lock(gpriv); |
| unsigned long flags; |
| int ret = -EIO; |
| |
| /* |
| * if it already have pipe, |
| * nothing to do |
| */ |
| if (uep->pipe) |
| return 0; |
| |
| /******************** spin lock ********************/ |
| spin_lock_irqsave(lock, flags); |
| |
| pipe = usbhs_pipe_malloc(priv, desc); |
| if (pipe) { |
| uep->pipe = pipe; |
| pipe->mod_private = uep; |
| INIT_LIST_HEAD(&uep->list); |
| |
| if (usb_endpoint_dir_in(desc)) |
| uep->handler = &usbhsg_handler_send_packet; |
| else |
| uep->handler = &usbhsg_handler_recv_packet; |
| |
| ret = 0; |
| } |
| spin_unlock_irqrestore(lock, flags); |
| /******************** spin unlock ******************/ |
| |
| return ret; |
| } |
| |
| static int usbhsg_ep_disable(struct usb_ep *ep) |
| { |
| struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep); |
| struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep); |
| spinlock_t *lock = usbhsg_gpriv_to_lock(gpriv); |
| unsigned long flags; |
| int ret; |
| |
| /******************** spin lock ********************/ |
| spin_lock_irqsave(lock, flags); |
| ret = usbhsg_pipe_disable(uep); |
| spin_unlock_irqrestore(lock, flags); |
| /******************** spin unlock ******************/ |
| |
| return ret; |
| } |
| |
| static struct usb_request *usbhsg_ep_alloc_request(struct usb_ep *ep, |
| gfp_t gfp_flags) |
| { |
| struct usbhsg_request *ureq; |
| |
| ureq = kzalloc(sizeof *ureq, gfp_flags); |
| if (!ureq) |
| return NULL; |
| |
| INIT_LIST_HEAD(&ureq->node); |
| return &ureq->req; |
| } |
| |
| static void usbhsg_ep_free_request(struct usb_ep *ep, |
| struct usb_request *req) |
| { |
| struct usbhsg_request *ureq = usbhsg_req_to_ureq(req); |
| |
| WARN_ON(!list_empty(&ureq->node)); |
| kfree(ureq); |
| } |
| |
| static int usbhsg_ep_queue(struct usb_ep *ep, struct usb_request *req, |
| gfp_t gfp_flags) |
| { |
| struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep); |
| struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep); |
| struct usbhsg_request *ureq = usbhsg_req_to_ureq(req); |
| struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep); |
| spinlock_t *lock = usbhsg_gpriv_to_lock(gpriv); |
| unsigned long flags; |
| int ret = 0; |
| int is_locked; |
| |
| /* |
| * CAUTION [*endpoint queue*] |
| * |
| * This function will be called from usb_request :: complete |
| * or usb driver timing. |
| * If this function is called from usb_request :: complete, |
| * it is already under spinlock on this driver. |
| * but it is called frm usb driver, this function should call spinlock. |
| * |
| * This function is using spin_trylock_irqsave to solve this issue. |
| * if "is_locked" is 1, this mean this function lock it. |
| * but if it is 0, this mean it is already under spin lock. |
| * see also |
| * CAUTION [*queue handler*] |
| * CAUTION [*request complete*] |
| */ |
| |
| /******************** spin lock ********************/ |
| is_locked = spin_trylock_irqsave(lock, flags); |
| |
| /* param check */ |
| if (usbhsg_is_not_connected(gpriv) || |
| unlikely(!gpriv->driver) || |
| unlikely(!pipe)) |
| ret = -ESHUTDOWN; |
| else |
| usbhsg_queue_push(uep, ureq); |
| |
| if (is_locked) |
| spin_unlock_irqrestore(lock, flags); |
| /******************** spin unlock ******************/ |
| |
| usbhsg_queue_prepare(uep); |
| |
| return ret; |
| } |
| |
| static int usbhsg_ep_dequeue(struct usb_ep *ep, struct usb_request *req) |
| { |
| struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep); |
| struct usbhsg_request *ureq = usbhsg_req_to_ureq(req); |
| struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep); |
| spinlock_t *lock = usbhsg_gpriv_to_lock(gpriv); |
| unsigned long flags; |
| int is_locked; |
| |
| /* |
| * see |
| * CAUTION [*queue handler*] |
| * CAUTION [*endpoint queue*] |
| * CAUTION [*request complete*] |
| */ |
| |
| /******************** spin lock ********************/ |
| is_locked = spin_trylock_irqsave(lock, flags); |
| |
| usbhsg_queue_pop(uep, ureq, -ECONNRESET); |
| |
| if (is_locked) |
| spin_unlock_irqrestore(lock, flags); |
| /******************** spin unlock ******************/ |
| |
| return 0; |
| } |
| |
| static int __usbhsg_ep_set_halt_wedge(struct usb_ep *ep, int halt, int wedge) |
| { |
| struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep); |
| struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep); |
| struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep); |
| struct device *dev = usbhsg_gpriv_to_dev(gpriv); |
| spinlock_t *lock = usbhsg_gpriv_to_lock(gpriv); |
| unsigned long flags; |
| int ret = -EAGAIN; |
| int is_locked; |
| |
| /* |
| * see |
| * CAUTION [*queue handler*] |
| * CAUTION [*endpoint queue*] |
| * CAUTION [*request complete*] |
| */ |
| |
| /******************** spin lock ********************/ |
| is_locked = spin_trylock_irqsave(lock, flags); |
| if (!usbhsg_queue_get(uep)) { |
| |
| dev_dbg(dev, "set halt %d (pipe %d)\n", |
| halt, usbhs_pipe_number(pipe)); |
| |
| if (halt) |
| usbhs_fifo_stall(pipe); |
| else |
| usbhs_fifo_disable(pipe); |
| |
| if (halt && wedge) |
| usbhsg_status_set(gpriv, USBHSG_STATUS_WEDGE); |
| else |
| usbhsg_status_clr(gpriv, USBHSG_STATUS_WEDGE); |
| |
| ret = 0; |
| } |
| |
| if (is_locked) |
| spin_unlock_irqrestore(lock, flags); |
| /******************** spin unlock ******************/ |
| |
| return ret; |
| } |
| |
| static int usbhsg_ep_set_halt(struct usb_ep *ep, int value) |
| { |
| return __usbhsg_ep_set_halt_wedge(ep, value, 0); |
| } |
| |
| static int usbhsg_ep_set_wedge(struct usb_ep *ep) |
| { |
| return __usbhsg_ep_set_halt_wedge(ep, 1, 1); |
| } |
| |
| static struct usb_ep_ops usbhsg_ep_ops = { |
| .enable = usbhsg_ep_enable, |
| .disable = usbhsg_ep_disable, |
| |
| .alloc_request = usbhsg_ep_alloc_request, |
| .free_request = usbhsg_ep_free_request, |
| |
| .queue = usbhsg_ep_queue, |
| .dequeue = usbhsg_ep_dequeue, |
| |
| .set_halt = usbhsg_ep_set_halt, |
| .set_wedge = usbhsg_ep_set_wedge, |
| }; |
| |
| /* |
| * usb module start/end |
| */ |
| static int usbhsg_try_start(struct usbhs_priv *priv, u32 status) |
| { |
| struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv); |
| struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv); |
| struct usbhs_mod *mod = usbhs_mod_get_current(priv); |
| struct device *dev = usbhs_priv_to_dev(priv); |
| spinlock_t *lock = usbhsg_gpriv_to_lock(gpriv); |
| unsigned long flags; |
| |
| /******************** spin lock ********************/ |
| spin_lock_irqsave(lock, flags); |
| |
| /* |
| * enable interrupt and systems if ready |
| */ |
| usbhsg_status_set(gpriv, status); |
| if (!(usbhsg_status_has(gpriv, USBHSG_STATUS_STARTED) && |
| usbhsg_status_has(gpriv, USBHSG_STATUS_REGISTERD))) |
| goto usbhsg_try_start_unlock; |
| |
| dev_dbg(dev, "start gadget\n"); |
| |
| /* |
| * pipe initialize and enable DCP |
| */ |
| usbhs_pipe_init(priv); |
| usbhsg_uep_init(gpriv); |
| usbhsg_dcp_enable(dcp); |
| |
| /* |
| * system config enble |
| * - HI speed |
| * - function |
| * - usb module |
| */ |
| usbhs_sys_hispeed_ctrl(priv, 1); |
| usbhs_sys_function_ctrl(priv, 1); |
| usbhs_sys_usb_ctrl(priv, 1); |
| |
| /* |
| * enable irq callback |
| */ |
| mod->irq_dev_state = usbhsg_irq_dev_state; |
| mod->irq_ctrl_stage = usbhsg_irq_ctrl_stage; |
| mod->irq_empty = usbhsg_irq_empty; |
| mod->irq_ready = usbhsg_irq_ready; |
| mod->irq_bempsts = 0; |
| mod->irq_brdysts = 0; |
| usbhs_irq_callback_update(priv, mod); |
| |
| usbhsg_try_start_unlock: |
| spin_unlock_irqrestore(lock, flags); |
| /******************** spin unlock ********************/ |
| |
| return 0; |
| } |
| |
| static int usbhsg_try_stop(struct usbhs_priv *priv, u32 status) |
| { |
| struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv); |
| struct usbhs_mod *mod = usbhs_mod_get_current(priv); |
| struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv); |
| struct device *dev = usbhs_priv_to_dev(priv); |
| spinlock_t *lock = usbhsg_gpriv_to_lock(gpriv); |
| unsigned long flags; |
| |
| /******************** spin lock ********************/ |
| spin_lock_irqsave(lock, flags); |
| |
| /* |
| * disable interrupt and systems if 1st try |
| */ |
| usbhsg_status_clr(gpriv, status); |
| if (!usbhsg_status_has(gpriv, USBHSG_STATUS_STARTED) && |
| !usbhsg_status_has(gpriv, USBHSG_STATUS_REGISTERD)) |
| goto usbhsg_try_stop_unlock; |
| |
| /* disable all irq */ |
| mod->irq_dev_state = NULL; |
| mod->irq_ctrl_stage = NULL; |
| mod->irq_empty = NULL; |
| mod->irq_ready = NULL; |
| mod->irq_bempsts = 0; |
| mod->irq_brdysts = 0; |
| usbhs_irq_callback_update(priv, mod); |
| |
| usbhsg_dcp_disable(dcp); |
| |
| gpriv->gadget.speed = USB_SPEED_UNKNOWN; |
| |
| /* disable sys */ |
| usbhs_sys_hispeed_ctrl(priv, 0); |
| usbhs_sys_function_ctrl(priv, 0); |
| usbhs_sys_usb_ctrl(priv, 0); |
| |
| spin_unlock_irqrestore(lock, flags); |
| /******************** spin unlock ********************/ |
| |
| if (gpriv->driver && |
| gpriv->driver->disconnect) |
| gpriv->driver->disconnect(&gpriv->gadget); |
| |
| dev_dbg(dev, "stop gadget\n"); |
| |
| return 0; |
| |
| usbhsg_try_stop_unlock: |
| spin_unlock_irqrestore(lock, flags); |
| |
| return 0; |
| } |
| |
| /* |
| * |
| * linux usb function |
| * |
| */ |
| struct usbhsg_gpriv *the_controller; |
| int usb_gadget_probe_driver(struct usb_gadget_driver *driver, |
| int (*bind)(struct usb_gadget *)) |
| { |
| struct usbhsg_gpriv *gpriv = the_controller; |
| struct usbhs_priv *priv; |
| struct device *dev; |
| int ret; |
| |
| if (!bind || |
| !driver || |
| !driver->setup || |
| driver->speed != USB_SPEED_HIGH) |
| return -EINVAL; |
| if (!gpriv) |
| return -ENODEV; |
| if (gpriv->driver) |
| return -EBUSY; |
| |
| dev = usbhsg_gpriv_to_dev(gpriv); |
| priv = usbhsg_gpriv_to_priv(gpriv); |
| |
| /* first hook up the driver ... */ |
| gpriv->driver = driver; |
| gpriv->gadget.dev.driver = &driver->driver; |
| |
| ret = device_add(&gpriv->gadget.dev); |
| if (ret) { |
| dev_err(dev, "device_add error %d\n", ret); |
| goto add_fail; |
| } |
| |
| ret = bind(&gpriv->gadget); |
| if (ret) { |
| dev_err(dev, "bind to driver %s error %d\n", |
| driver->driver.name, ret); |
| goto bind_fail; |
| } |
| |
| dev_dbg(dev, "bind %s\n", driver->driver.name); |
| |
| return usbhsg_try_start(priv, USBHSG_STATUS_REGISTERD); |
| |
| bind_fail: |
| device_del(&gpriv->gadget.dev); |
| add_fail: |
| gpriv->driver = NULL; |
| gpriv->gadget.dev.driver = NULL; |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(usb_gadget_probe_driver); |
| |
| int usb_gadget_unregister_driver(struct usb_gadget_driver *driver) |
| { |
| struct usbhsg_gpriv *gpriv = the_controller; |
| struct usbhs_priv *priv; |
| struct device *dev = usbhsg_gpriv_to_dev(gpriv); |
| |
| if (!gpriv) |
| return -ENODEV; |
| |
| if (!driver || |
| !driver->unbind || |
| driver != gpriv->driver) |
| return -EINVAL; |
| |
| dev = usbhsg_gpriv_to_dev(gpriv); |
| priv = usbhsg_gpriv_to_priv(gpriv); |
| |
| usbhsg_try_stop(priv, USBHSG_STATUS_REGISTERD); |
| device_del(&gpriv->gadget.dev); |
| gpriv->driver = NULL; |
| |
| if (driver->disconnect) |
| driver->disconnect(&gpriv->gadget); |
| |
| driver->unbind(&gpriv->gadget); |
| dev_dbg(dev, "unbind %s\n", driver->driver.name); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(usb_gadget_unregister_driver); |
| |
| /* |
| * usb gadget ops |
| */ |
| static int usbhsg_get_frame(struct usb_gadget *gadget) |
| { |
| struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget); |
| struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv); |
| |
| return usbhs_frame_get_num(priv); |
| } |
| |
| static struct usb_gadget_ops usbhsg_gadget_ops = { |
| .get_frame = usbhsg_get_frame, |
| }; |
| |
| static int usbhsg_start(struct usbhs_priv *priv) |
| { |
| return usbhsg_try_start(priv, USBHSG_STATUS_STARTED); |
| } |
| |
| static int usbhsg_stop(struct usbhs_priv *priv) |
| { |
| return usbhsg_try_stop(priv, USBHSG_STATUS_STARTED); |
| } |
| |
| int __devinit usbhs_mod_gadget_probe(struct usbhs_priv *priv) |
| { |
| struct usbhsg_gpriv *gpriv; |
| struct usbhsg_uep *uep; |
| struct device *dev = usbhs_priv_to_dev(priv); |
| int pipe_size = usbhs_get_dparam(priv, pipe_size); |
| int i; |
| |
| gpriv = kzalloc(sizeof(struct usbhsg_gpriv), GFP_KERNEL); |
| if (!gpriv) { |
| dev_err(dev, "Could not allocate gadget priv\n"); |
| return -ENOMEM; |
| } |
| |
| uep = kzalloc(sizeof(struct usbhsg_uep) * pipe_size, GFP_KERNEL); |
| if (!uep) { |
| dev_err(dev, "Could not allocate ep\n"); |
| goto usbhs_mod_gadget_probe_err_gpriv; |
| } |
| |
| /* |
| * CAUTION |
| * |
| * There is no guarantee that it is possible to access usb module here. |
| * Don't accesses to it. |
| * The accesse will be enable after "usbhsg_start" |
| */ |
| |
| /* |
| * register itself |
| */ |
| usbhs_mod_register(priv, &gpriv->mod, USBHS_GADGET); |
| |
| /* init gpriv */ |
| gpriv->mod.name = "gadget"; |
| gpriv->mod.start = usbhsg_start; |
| gpriv->mod.stop = usbhsg_stop; |
| gpriv->uep = uep; |
| gpriv->uep_size = pipe_size; |
| usbhsg_status_init(gpriv); |
| |
| /* |
| * init gadget |
| */ |
| device_initialize(&gpriv->gadget.dev); |
| dev_set_name(&gpriv->gadget.dev, "gadget"); |
| gpriv->gadget.dev.parent = dev; |
| gpriv->gadget.name = "renesas_usbhs_udc"; |
| gpriv->gadget.ops = &usbhsg_gadget_ops; |
| gpriv->gadget.is_dualspeed = 1; |
| |
| INIT_LIST_HEAD(&gpriv->gadget.ep_list); |
| |
| /* |
| * init usb_ep |
| */ |
| usbhsg_for_each_uep_with_dcp(uep, gpriv, i) { |
| uep->gpriv = gpriv; |
| snprintf(uep->ep_name, EP_NAME_SIZE, "ep%d", i); |
| |
| uep->ep.name = uep->ep_name; |
| uep->ep.ops = &usbhsg_ep_ops; |
| INIT_LIST_HEAD(&uep->ep.ep_list); |
| INIT_LIST_HEAD(&uep->list); |
| |
| /* init DCP */ |
| if (usbhsg_is_dcp(uep)) { |
| gpriv->gadget.ep0 = &uep->ep; |
| uep->ep.maxpacket = 64; |
| } |
| /* init normal pipe */ |
| else { |
| uep->ep.maxpacket = 512; |
| list_add_tail(&uep->ep.ep_list, &gpriv->gadget.ep_list); |
| } |
| } |
| |
| the_controller = gpriv; |
| |
| dev_info(dev, "gadget probed\n"); |
| |
| return 0; |
| |
| usbhs_mod_gadget_probe_err_gpriv: |
| kfree(gpriv); |
| |
| return -ENOMEM; |
| } |
| |
| void __devexit usbhs_mod_gadget_remove(struct usbhs_priv *priv) |
| { |
| struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv); |
| |
| kfree(gpriv); |
| } |