148 lines
3.2 KiB
C
148 lines
3.2 KiB
C
/*
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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/interrupt.h>
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#include <linux/irq.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_dispatch(void)
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{
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if (read_c0_cause() & read_c0_status() & C_SW0)
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do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_RTLX_IRQ);
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}
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/*
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* Interrupt handler may be called before rtlx_init has otherwise had
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* a chance to run.
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*/
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static irqreturn_t rtlx_interrupt(int irq, void *dev_id)
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{
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unsigned int vpeflags;
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unsigned long flags;
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int i;
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local_irq_save(flags);
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vpeflags = dvpe();
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set_c0_status(0x100 << MIPS_CPU_RTLX_IRQ);
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irq_enable_hazard();
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evpe(vpeflags);
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local_irq_restore(flags);
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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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return IRQ_HANDLED;
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}
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static int rtlx_irq_num = MIPS_CPU_IRQ_BASE + MIPS_CPU_RTLX_IRQ;
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void _interrupt_sp(void)
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{
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unsigned long flags;
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local_irq_save(flags);
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dvpe();
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settc(1);
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write_vpe_c0_cause(read_vpe_c0_cause() | C_SW0);
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evpe(EVPE_ENABLE);
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local_irq_restore(flags);
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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 (aprp_cpu_index() == 0) {
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pr_warn("No TCs reserved for AP/SP, not initializing RTLX.\n"
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"Pass maxtcs=<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_dispatch;
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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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err = request_irq(rtlx_irq_num, rtlx_interrupt, 0, "RTLX", rtlx);
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if (err)
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goto out_class;
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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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