diff options
Diffstat (limited to 'drivers/staging/csr/bh.c')
| -rw-r--r-- | drivers/staging/csr/bh.c | 404 |
1 files changed, 0 insertions, 404 deletions
diff --git a/drivers/staging/csr/bh.c b/drivers/staging/csr/bh.c deleted file mode 100644 index d795852ccb1c..000000000000 --- a/drivers/staging/csr/bh.c +++ /dev/null @@ -1,404 +0,0 @@ -/* - * --------------------------------------------------------------------------- - * FILE: bh.c - * - * PURPOSE: - * Provides an implementation for the driver bottom-half. - * It is part of the porting exercise in Linux. - * - * Copyright (C) 2005-2009 by Cambridge Silicon Radio Ltd. - * - * Refer to LICENSE.txt included with this source code for details on - * the license terms. - * - * --------------------------------------------------------------------------- - */ -#include "csr_wifi_hip_unifi.h" -#include "unifi_priv.h" -#include <linux/sched/rt.h> - -/* - * --------------------------------------------------------------------------- - * uf_start_thread - * - * Helper function to start a new thread. - * - * Arguments: - * priv Pointer to OS driver structure for the device. - * thread Pointer to the thread object - * func The thread function - * - * Returns: - * 0 on success or else a Linux error code. - * --------------------------------------------------------------------------- - */ -int uf_start_thread(unifi_priv_t *priv, - struct uf_thread *thread, int (*func)(void *)) -{ - if (thread->thread_task != NULL) { - unifi_error(priv, "%s thread already started\n", thread->name); - return 0; - } - - /* Start the kernel thread that handles all h/w accesses. */ - thread->thread_task = kthread_run(func, priv, "%s", thread->name); - if (IS_ERR(thread->thread_task)) - return PTR_ERR(thread->thread_task); - - /* Module parameter overides the thread priority */ - if (bh_priority != -1) { - if (bh_priority >= 0 && bh_priority <= MAX_RT_PRIO) { - struct sched_param param; - priv->bh_thread.prio = bh_priority; - unifi_trace(priv, UDBG1, - "%s thread (RT) priority = %d\n", - thread->name, bh_priority); - param.sched_priority = bh_priority; - sched_setscheduler(thread->thread_task, - SCHED_FIFO, ¶m); - } else if (bh_priority > MAX_RT_PRIO && - bh_priority <= MAX_PRIO) { - priv->bh_thread.prio = bh_priority; - unifi_trace(priv, UDBG1, "%s thread priority = %d\n", - thread->name, - PRIO_TO_NICE(bh_priority)); - set_user_nice(thread->thread_task, - PRIO_TO_NICE(bh_priority)); - } else { - priv->bh_thread.prio = DEFAULT_PRIO; - unifi_warning(priv, - "%s thread unsupported (%d) priority\n", - thread->name, bh_priority); - } - } else - priv->bh_thread.prio = DEFAULT_PRIO; - unifi_trace(priv, UDBG2, "Started %s thread\n", thread->name); - - return 0; -} /* uf_start_thread() */ - - -/* - * --------------------------------------------------------------------------- - * uf_stop_thread - * - * Helper function to stop a thread. - * - * Arguments: - * priv Pointer to OS driver structure for the device. - * thread Pointer to the thread object - * - * Returns: - * - * --------------------------------------------------------------------------- - */ -void uf_stop_thread(unifi_priv_t *priv, struct uf_thread *thread) -{ - if (!thread->thread_task) { - unifi_notice(priv, "%s thread is already stopped\n", - thread->name); - return; - } - - unifi_trace(priv, UDBG2, "Stopping %s thread\n", thread->name); - - kthread_stop(thread->thread_task); - thread->thread_task = NULL; - -} /* uf_stop_thread() */ - - - -/* - * --------------------------------------------------------------------------- - * uf_wait_for_thread_to_stop - * - * Helper function to wait until a thread is stopped. - * - * Arguments: - * priv Pointer to OS driver structure for the device. - * - * Returns: - * - * --------------------------------------------------------------------------- - */ -void -uf_wait_for_thread_to_stop(unifi_priv_t *priv, struct uf_thread *thread) -{ - /* - * kthread_stop() cannot handle the thread exiting while - * kthread_should_stop() is false, so sleep until kthread_stop() - * wakes us up - */ - unifi_trace(priv, UDBG2, "%s waiting for the stop signal.\n", - thread->name); - set_current_state(TASK_INTERRUPTIBLE); - if (!kthread_should_stop()) { - unifi_trace(priv, UDBG2, "%s schedule....\n", thread->name); - schedule(); - } - - thread->thread_task = NULL; - unifi_trace(priv, UDBG2, "%s exiting....\n", thread->name); -} /* uf_wait_for_thread_to_stop() */ - - -/* - * --------------------------------------------------------------------------- - * handle_bh_error - * - * This function reports an error returned from the HIP core bottom-half. - * Normally, implemented during the porting exercise, passing the error - * to the SME using unifi_sys_wifi_off_ind(). - * The SME will try to reset the device and go through - * the initialisation of the UniFi. - * - * Arguments: - * priv Pointer to OS driver structure for the device. - * - * Returns: - * None. - * --------------------------------------------------------------------------- - */ -static void -handle_bh_error(unifi_priv_t *priv) -{ - netInterface_priv_t *interfacePriv; - u8 conf_param = CONFIG_IND_ERROR; - u8 interfaceTag; - - - /* Block unifi_run_bh() until the error has been handled. */ - priv->bh_thread.block_thread = 1; - - /* Consider UniFi to be uninitialised */ - priv->init_progress = UNIFI_INIT_NONE; - - /* Stop the network traffic */ - for (interfaceTag = 0; - interfaceTag < CSR_WIFI_NUM_INTERFACES; interfaceTag++) { - interfacePriv = priv->interfacePriv[interfaceTag]; - if (interfacePriv->netdev_registered) - netif_carrier_off(priv->netdev[interfaceTag]); - } - -#ifdef CSR_NATIVE_LINUX - /* Force any client waiting on an mlme_wait_for_reply() to abort. */ - uf_abort_mlme(priv); - - /* Cancel any pending workqueue tasks */ - flush_workqueue(priv->unifi_workqueue); - -#endif /* CSR_NATIVE_LINUX */ - - unifi_error(priv, - "handle_bh_error: fatal error is reported to the SME.\n"); - /* Notify the clients (SME or unifi_manager) for the error. */ - ul_log_config_ind(priv, &conf_param, sizeof(u8)); - -} /* handle_bh_error() */ - - - -/* - * --------------------------------------------------------------------------- - * bh_thread_function - * - * All hardware access happens in this thread. - * This means there is no need for locks on the hardware and we don't need - * to worry about reentrancy with the SDIO library. - * Provides and example implementation on how to call unifi_bh(), which - * is part of the HIP core API. - * - * It processes the events generated by unifi_run_bh() to serialise calls - * to unifi_bh(). It also demonstrates how the timeout parameter passed in - * and returned from unifi_bh() needs to be handled. - * - * Arguments: - * arg Pointer to OS driver structure for the device. - * - * Returns: - * None. - * - * Notes: - * When the bottom half of the driver needs to process signals, events, - * or simply the host status (i.e sleep mode), it invokes unifi_run_bh(). - * Since we need all SDIO transaction to be in a single thread, the - * unifi_run_bh() will wake up this thread to process it. - * - * --------------------------------------------------------------------------- - */ -static int bh_thread_function(void *arg) -{ - unifi_priv_t *priv = (unifi_priv_t *)arg; - CsrResult csrResult; - long ret; - u32 timeout, t; - struct uf_thread *this_thread; - - unifi_trace(priv, UDBG2, "bh_thread_function starting\n"); - - this_thread = &priv->bh_thread; - - t = timeout = 0; - while (!kthread_should_stop()) { - /* - * wait until an error occurs, - * or we need to process something. - */ - unifi_trace(priv, UDBG3, "bh_thread goes to sleep.\n"); - - if (timeout > 0) { - /* Convert t in ms to jiffies */ - t = msecs_to_jiffies(timeout); - ret = wait_event_interruptible_timeout( - this_thread->wakeup_q, - (this_thread->wakeup_flag && !this_thread->block_thread) || - kthread_should_stop(), - t); - timeout = (ret > 0) ? jiffies_to_msecs(ret) : 0; - } else { - ret = wait_event_interruptible(this_thread->wakeup_q, - (this_thread->wakeup_flag && !this_thread->block_thread) || - kthread_should_stop()); - } - - if (kthread_should_stop()) { - unifi_trace(priv, UDBG2, - "bh_thread: signalled to exit\n"); - break; - } - - if (ret < 0) { - unifi_notice(priv, - "bh_thread: wait_event returned %d, thread will exit\n", - ret); - uf_wait_for_thread_to_stop(priv, this_thread); - break; - } - - this_thread->wakeup_flag = 0; - - unifi_trace(priv, UDBG3, "bh_thread calls unifi_bh().\n"); - - CsrSdioClaim(priv->sdio); - csrResult = unifi_bh(priv->card, &timeout); - if (csrResult != CSR_RESULT_SUCCESS) { - if (csrResult == CSR_WIFI_HIP_RESULT_NO_DEVICE) { - CsrSdioRelease(priv->sdio); - uf_wait_for_thread_to_stop(priv, this_thread); - break; - } - /* Errors must be delivered to the error task */ - handle_bh_error(priv); - } - CsrSdioRelease(priv->sdio); - } - - /* - * I would normally try to call csr_sdio_remove_irq() here to make sure - * that we do not get any interrupts while this thread is not running. - * However, the MMC/SDIO driver tries to kill its' interrupt thread. - * The kernel threads implementation does not allow to kill threads - * from a signalled to stop thread. - * So, instead call csr_sdio_linux_remove_irq() always after calling - * uf_stop_thread() to kill this thread. - */ - - unifi_trace(priv, UDBG2, "bh_thread exiting....\n"); - return 0; -} /* bh_thread_function() */ - - -/* - * --------------------------------------------------------------------------- - * uf_init_bh - * - * Helper function to start the bottom half of the driver. - * All we need to do here is start the I/O bh thread. - * - * Arguments: - * priv Pointer to OS driver structure for the device. - * - * Returns: - * 0 on success or else a Linux error code. - * --------------------------------------------------------------------------- - */ -int -uf_init_bh(unifi_priv_t *priv) -{ - int r; - - /* Enable mlme interface. */ - priv->io_aborted = 0; - - - /* Start the BH thread */ - r = uf_start_thread(priv, &priv->bh_thread, bh_thread_function); - if (r) { - unifi_error(priv, - "uf_init_bh: failed to start the BH thread.\n"); - return r; - } - - /* Allow interrupts */ - r = csr_sdio_linux_install_irq(priv->sdio); - if (r) { - unifi_error(priv, - "uf_init_bh: failed to install the IRQ.\n"); - - uf_stop_thread(priv, &priv->bh_thread); - } - - return r; -} /* uf_init_bh() */ - - -/* - * --------------------------------------------------------------------------- - * unifi_run_bh - * - * Part of the HIP core lib API, implemented in the porting exercise. - * The bottom half of the driver calls this function when - * it wants to process anything that requires access to unifi. - * We need to call unifi_bh() which in this implementation is done - * by waking up the I/O thread. - * - * Arguments: - * ospriv Pointer to OS driver structure for the device. - * - * Returns: - * 0 on success or else a Linux error code. - * - * Notes: - * --------------------------------------------------------------------------- - */ -CsrResult unifi_run_bh(void *ospriv) -{ - unifi_priv_t *priv = ospriv; - - /* - * If an error has occurred, we discard silently all messages from the bh - * until the error has been processed and the unifi has been - * reinitialised. - */ - if (priv->bh_thread.block_thread == 1) { - unifi_trace(priv, UDBG3, "unifi_run_bh: discard message.\n"); - /* - * Do not try to acknowledge a pending interrupt here. - * This function is called by unifi_send_signal() - * which in turn can be running in an atomic or 'disabled irq' - * level if a signal is sent from a workqueue task - * (i.e multicass addresses set). We can not hold the SDIO lock - * because it might sleep. - */ - return CSR_RESULT_FAILURE; - } - - priv->bh_thread.wakeup_flag = 1; - /* wake up I/O thread */ - wake_up_interruptible(&priv->bh_thread.wakeup_q); - - return CSR_RESULT_SUCCESS; -} /* unifi_run_bh() */ - |