/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2005 MIPS Technologies, Inc. All rights reserved.
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* Copyright (C) 2013 Imagination Technologies Ltd.
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*/
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#include <linux/device.h>
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#include <linux/fs.h>
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#include <linux/err.h>
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#include <linux/wait.h>
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#include <linux/sched.h>
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#include <linux/smp.h>
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#include <asm/mips_mt.h>
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#include <asm/vpe.h>
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#include <asm/rtlx.h>
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static int major;
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static void rtlx_interrupt(void)
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{
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int i;
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struct rtlx_info *info;
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struct rtlx_info **p = vpe_get_shared(aprp_cpu_index());
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if (p == NULL || *p == NULL)
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return;
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info = *p;
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if (info->ap_int_pending == 1 && smp_processor_id() == 0) {
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for (i = 0; i < RTLX_CHANNELS; i++) {
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wake_up(&channel_wqs[i].lx_queue);
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wake_up(&channel_wqs[i].rt_queue);
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}
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info->ap_int_pending = 0;
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}
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}
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void _interrupt_sp(void)
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{
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smp_send_reschedule(aprp_cpu_index());
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}
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int __init rtlx_module_init(void)
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{
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struct device *dev;
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int i, err;
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if (!cpu_has_mipsmt) {
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pr_warn("VPE loader: not a MIPS MT capable processor\n");
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return -ENODEV;
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}
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if (num_possible_cpus() - aprp_cpu_index() < 1) {
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pr_warn("No TCs reserved for AP/SP, not initializing RTLX.\n"
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"Pass maxcpus=<n> argument as kernel argument\n");
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return -ENODEV;
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}
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major = register_chrdev(0, RTLX_MODULE_NAME, &rtlx_fops);
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if (major < 0) {
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pr_err("rtlx_module_init: unable to register device\n");
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return major;
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}
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/* initialise the wait queues */
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for (i = 0; i < RTLX_CHANNELS; i++) {
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init_waitqueue_head(&channel_wqs[i].rt_queue);
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init_waitqueue_head(&channel_wqs[i].lx_queue);
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atomic_set(&channel_wqs[i].in_open, 0);
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mutex_init(&channel_wqs[i].mutex);
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dev = device_create(mt_class, NULL, MKDEV(major, i), NULL,
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"%s%d", RTLX_MODULE_NAME, i);
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if (IS_ERR(dev)) {
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while (i--)
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device_destroy(mt_class, MKDEV(major, i));
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err = PTR_ERR(dev);
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goto out_chrdev;
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}
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}
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/* set up notifiers */
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rtlx_notify.start = rtlx_starting;
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rtlx_notify.stop = rtlx_stopping;
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vpe_notify(aprp_cpu_index(), &rtlx_notify);
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if (cpu_has_vint) {
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aprp_hook = rtlx_interrupt;
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} else {
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pr_err("APRP RTLX init on non-vectored-interrupt processor\n");
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err = -ENODEV;
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goto out_class;
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}
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return 0;
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out_class:
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for (i = 0; i < RTLX_CHANNELS; i++)
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device_destroy(mt_class, MKDEV(major, i));
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out_chrdev:
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unregister_chrdev(major, RTLX_MODULE_NAME);
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return err;
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}
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void __exit rtlx_module_exit(void)
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{
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int i;
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for (i = 0; i < RTLX_CHANNELS; i++)
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device_destroy(mt_class, MKDEV(major, i));
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unregister_chrdev(major, RTLX_MODULE_NAME);
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aprp_hook = NULL;
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}
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