diff options
Diffstat (limited to 'drivers/usb/renesas_usbhs/mod_gadget.c')
| -rw-r--r-- | drivers/usb/renesas_usbhs/mod_gadget.c | 1341 |
1 files changed, 1341 insertions, 0 deletions
diff --git a/drivers/usb/renesas_usbhs/mod_gadget.c b/drivers/usb/renesas_usbhs/mod_gadget.c new file mode 100644 index 0000000..9a5ac02 --- /dev/null +++ b/drivers/usb/renesas_usbhs/mod_gadget.c @@ -0,0 +1,1341 @@ +/* + * 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); + } + + uep->pipe->mod_private = NULL; + uep->pipe = NULL; + + return 0; +} + +/* + * + * 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; + + /******************** 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_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); +} |
