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147 lines
3.2 KiB
147 lines
3.2 KiB
/* |
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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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