/***
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*
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* rtmac/tdma/tdma_dev.c
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*
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* RTmac - real-time networking media access control subsystem
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* Copyright (C) 2002 Marc Kleine-Budde <kleine-budde@gmx.de>
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* 2003-2006 Jan Kiszka <Jan.Kiszka@web.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/list.h>
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#include <rtdev.h>
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#include <rtmac.h>
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#include <rtmac/tdma/tdma.h>
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struct tdma_dev_ctx {
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rtdm_task_t *cycle_waiter;
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};
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static int tdma_dev_open(struct rtdm_fd *fd, int oflags)
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{
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struct tdma_dev_ctx *ctx = rtdm_fd_to_private(fd);
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ctx->cycle_waiter = NULL;
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return 0;
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}
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static void tdma_dev_close(struct rtdm_fd *fd)
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{
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struct tdma_dev_ctx *ctx = rtdm_fd_to_private(fd);
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rtdm_lockctx_t lock_ctx;
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cobalt_atomic_enter(lock_ctx);
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if (ctx->cycle_waiter)
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rtdm_task_unblock(ctx->cycle_waiter);
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cobalt_atomic_leave(lock_ctx);
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}
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static int wait_on_sync(struct tdma_dev_ctx *tdma_ctx, rtdm_event_t *sync_event)
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{
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rtdm_lockctx_t lock_ctx;
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int ret;
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cobalt_atomic_enter(lock_ctx);
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/* keep it simple: only one waiter per device instance allowed */
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if (!tdma_ctx->cycle_waiter) {
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tdma_ctx->cycle_waiter = rtdm_task_current();
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ret = rtdm_event_wait(sync_event);
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tdma_ctx->cycle_waiter = NULL;
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} else
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ret = -EBUSY;
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cobalt_atomic_leave(lock_ctx);
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return ret;
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}
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static int tdma_dev_ioctl(struct rtdm_fd *fd, unsigned int request, void *arg)
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{
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struct tdma_dev_ctx *ctx = rtdm_fd_to_private(fd);
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struct tdma_priv *tdma;
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rtdm_lockctx_t lock_ctx;
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int ret;
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tdma = container_of(rtdm_fd_to_context(fd)->device, struct tdma_priv,
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api_device);
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switch (request) {
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case RTMAC_RTIOC_TIMEOFFSET: {
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nanosecs_rel_t offset;
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rtdm_lock_get_irqsave(&tdma->lock, lock_ctx);
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offset = tdma->clock_offset;
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rtdm_lock_put_irqrestore(&tdma->lock, lock_ctx);
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if (rtdm_fd_is_user(fd)) {
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if (!rtdm_rw_user_ok(fd, arg, sizeof(__s64)) ||
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rtdm_copy_to_user(fd, arg, &offset, sizeof(__s64)))
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return -EFAULT;
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} else
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*(__s64 *)arg = offset;
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return 0;
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}
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case RTMAC_RTIOC_WAITONCYCLE:
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if (!rtdm_in_rt_context())
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return -ENOSYS;
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if ((long)arg != TDMA_WAIT_ON_SYNC)
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return -EINVAL;
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return wait_on_sync(ctx, &tdma->sync_event);
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case RTMAC_RTIOC_WAITONCYCLE_EX: {
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struct rtmac_waitinfo *waitinfo = (struct rtmac_waitinfo *)arg;
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struct rtmac_waitinfo waitinfo_buf;
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#define WAITINFO_HEAD_SIZE \
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((char *)&waitinfo_buf.cycle_no - (char *)&waitinfo_buf)
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if (!rtdm_in_rt_context())
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return -ENOSYS;
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if (rtdm_fd_is_user(fd)) {
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if (!rtdm_rw_user_ok(fd, waitinfo,
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sizeof(struct rtmac_waitinfo)) ||
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rtdm_copy_from_user(fd, &waitinfo_buf, arg,
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WAITINFO_HEAD_SIZE))
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return -EFAULT;
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waitinfo = &waitinfo_buf;
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}
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if ((waitinfo->type != TDMA_WAIT_ON_SYNC) ||
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(waitinfo->size < sizeof(struct rtmac_waitinfo)))
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return -EINVAL;
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ret = wait_on_sync(ctx, &tdma->sync_event);
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if (ret)
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return ret;
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rtdm_lock_get_irqsave(&tdma->lock, lock_ctx);
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waitinfo->cycle_no = tdma->current_cycle;
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waitinfo->cycle_start = tdma->current_cycle_start;
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waitinfo->clock_offset = tdma->clock_offset;
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rtdm_lock_put_irqrestore(&tdma->lock, lock_ctx);
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if (rtdm_fd_is_user(fd)) {
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if (rtdm_copy_to_user(fd, arg, &waitinfo_buf,
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sizeof(struct rtmac_waitinfo)))
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return -EFAULT;
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}
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return 0;
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}
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default:
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return -ENOTTY;
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}
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}
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static struct rtdm_driver tdma_driver = { .profile_info = RTDM_PROFILE_INFO(
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tdma, RTDM_CLASS_RTMAC,
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RTDM_SUBCLASS_TDMA,
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RTNET_RTDM_VER),
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.device_flags = RTDM_NAMED_DEVICE,
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.device_count = 1,
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.context_size =
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sizeof(struct tdma_dev_ctx),
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.ops = {
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.open = tdma_dev_open,
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.ioctl_rt = tdma_dev_ioctl,
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.ioctl_nrt = tdma_dev_ioctl,
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.close = tdma_dev_close,
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} };
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int tdma_dev_init(struct rtnet_device *rtdev, struct tdma_priv *tdma)
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{
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char *pos;
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strcpy(tdma->device_name, "TDMA");
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for (pos = rtdev->name + strlen(rtdev->name) - 1;
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(pos >= rtdev->name) && ((*pos) >= '0') && (*pos <= '9'); pos--)
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;
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strncat(tdma->device_name + 4, pos + 1, IFNAMSIZ - 4);
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tdma->api_driver = tdma_driver;
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tdma->api_device.driver = &tdma->api_driver;
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tdma->api_device.label = tdma->device_name;
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return rtdm_dev_register(&tdma->api_device);
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}
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