[deliverable/linux.git] / arch / mips / kernel / rtlx-mt.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2005 MIPS Technologies, Inc.  All rights reserved.
 * Copyright (C) 2013 Imagination Technologies Ltd.
 */
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/err.h>
#include <linux/wait.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/irq.h>

#include <asm/mips_mt.h>
#include <asm/vpe.h>
#include <asm/rtlx.h>

static int major;

static void rtlx_dispatch(void)
{
	if (read_c0_cause() & read_c0_status() & C_SW0)
		do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_RTLX_IRQ);
}

/*
 * Interrupt handler may be called before rtlx_init has otherwise had
 * a chance to run.
 */
static irqreturn_t rtlx_interrupt(int irq, void *dev_id)
{
	unsigned int vpeflags;
	unsigned long flags;
	int i;

	/* Ought not to be strictly necessary for SMTC builds */
	local_irq_save(flags);
	vpeflags = dvpe();
	set_c0_status(0x100 << MIPS_CPU_RTLX_IRQ);
	irq_enable_hazard();
	evpe(vpeflags);
	local_irq_restore(flags);

	for (i = 0; i < RTLX_CHANNELS; i++) {
		wake_up(&channel_wqs[i].lx_queue);
		wake_up(&channel_wqs[i].rt_queue);
	}

	return IRQ_HANDLED;
}

static struct irqaction rtlx_irq = {
	.handler	= rtlx_interrupt,
	.name		= "RTLX",
};

static int rtlx_irq_num = MIPS_CPU_IRQ_BASE + MIPS_CPU_RTLX_IRQ;

void _interrupt_sp(void)
{
	unsigned long flags;

	local_irq_save(flags);
	dvpe();
	settc(1);
	write_vpe_c0_cause(read_vpe_c0_cause() | C_SW0);
	evpe(EVPE_ENABLE);
	local_irq_restore(flags);
}

int __init rtlx_module_init(void)
{
	struct device *dev;
	int i, err;

	if (!cpu_has_mipsmt) {
		pr_warn("VPE loader: not a MIPS MT capable processor\n");
		return -ENODEV;
	}

	if (aprp_cpu_index() == 0) {
		pr_warn("No TCs reserved for AP/SP, not initializing RTLX.\n"
			"Pass maxtcs=<n> argument as kernel argument\n");

		return -ENODEV;
	}

	major = register_chrdev(0, RTLX_MODULE_NAME, &rtlx_fops);
	if (major < 0) {
		pr_err("rtlx_module_init: unable to register device\n");
		return major;
	}

	/* initialise the wait queues */
	for (i = 0; i < RTLX_CHANNELS; i++) {
		init_waitqueue_head(&channel_wqs[i].rt_queue);
		init_waitqueue_head(&channel_wqs[i].lx_queue);
		atomic_set(&channel_wqs[i].in_open, 0);
		mutex_init(&channel_wqs[i].mutex);

		dev = device_create(mt_class, NULL, MKDEV(major, i), NULL,
				    "%s%d", RTLX_MODULE_NAME, i);
		if (IS_ERR(dev)) {
			err = PTR_ERR(dev);
			goto out_chrdev;
		}
	}

	/* set up notifiers */
	rtlx_notify.start = rtlx_starting;
	rtlx_notify.stop = rtlx_stopping;
	vpe_notify(aprp_cpu_index(), &rtlx_notify);

	if (cpu_has_vint) {
		aprp_hook = rtlx_dispatch;
	} else {
		pr_err("APRP RTLX init on non-vectored-interrupt processor\n");
		err = -ENODEV;
		goto out_class;
	}

	rtlx_irq.dev_id = rtlx;
	err = setup_irq(rtlx_irq_num, &rtlx_irq);
	if (err)
		goto out_class;

	return 0;

out_class:
	for (i = 0; i < RTLX_CHANNELS; i++)
		device_destroy(mt_class, MKDEV(major, i));
out_chrdev:
	unregister_chrdev(major, RTLX_MODULE_NAME);

	return err;
}

void __exit rtlx_module_exit(void)
{
	int i;

	for (i = 0; i < RTLX_CHANNELS; i++)
		device_destroy(mt_class, MKDEV(major, i));
	unregister_chrdev(major, RTLX_MODULE_NAME);
}
Commit	Line	Data
2c973ef0 DCZ	1	/*
	2	* This file is subject to the terms and conditions of the GNU General Public
	3	* License. See the file "COPYING" in the main directory of this archive
	4	* for more details.
	5	*
	6	* Copyright (C) 2005 MIPS Technologies, Inc. All rights reserved.
	7	* Copyright (C) 2013 Imagination Technologies Ltd.
	8	*/
	9	#include <linux/device.h>
	10	#include <linux/fs.h>
	11	#include <linux/err.h>
	12	#include <linux/wait.h>
	13	#include <linux/sched.h>
	14	#include <linux/interrupt.h>
	15	#include <linux/irq.h>
	16
	17	#include <asm/mips_mt.h>
	18	#include <asm/vpe.h>
	19	#include <asm/rtlx.h>
	20
	21	static int major;
	22
	23	static void rtlx_dispatch(void)
	24	{
	25	if (read_c0_cause() & read_c0_status() & C_SW0)
	26	do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_RTLX_IRQ);
	27	}
	28
	29	/*
	30	* Interrupt handler may be called before rtlx_init has otherwise had
	31	* a chance to run.
	32	*/
	33	static irqreturn_t rtlx_interrupt(int irq, void *dev_id)
	34	{
	35	unsigned int vpeflags;
	36	unsigned long flags;
	37	int i;
	38
	39	/* Ought not to be strictly necessary for SMTC builds */
	40	local_irq_save(flags);
	41	vpeflags = dvpe();
	42	set_c0_status(0x100 << MIPS_CPU_RTLX_IRQ);
	43	irq_enable_hazard();
	44	evpe(vpeflags);
	45	local_irq_restore(flags);
	46
	47	for (i = 0; i < RTLX_CHANNELS; i++) {
	48	wake_up(&channel_wqs[i].lx_queue);
	49	wake_up(&channel_wqs[i].rt_queue);
	50	}
	51
	52	return IRQ_HANDLED;
	53	}
	54
	55	static struct irqaction rtlx_irq = {
	56	.handler = rtlx_interrupt,
	57	.name = "RTLX",
	58	};
	59
	60	static int rtlx_irq_num = MIPS_CPU_IRQ_BASE + MIPS_CPU_RTLX_IRQ;
	61
	62	void _interrupt_sp(void)
	63	{
	64	unsigned long flags;
65
66	local_irq_save(flags);
67	dvpe();
68	settc(1);
69	write_vpe_c0_cause(read_vpe_c0_cause() \| C_SW0);
70	evpe(EVPE_ENABLE);
71	local_irq_restore(flags);
72	}
73
74	int __init rtlx_module_init(void)
75	{
76	struct device *dev;
77	int i, err;
78
79	if (!cpu_has_mipsmt) {
80	pr_warn("VPE loader: not a MIPS MT capable processor\n");
81	return -ENODEV;
82	}
83
84	if (aprp_cpu_index() == 0) {
85	pr_warn("No TCs reserved for AP/SP, not initializing RTLX.\n"
86	"Pass maxtcs=<n> argument as kernel argument\n");
87
88	return -ENODEV;
89	}
90
91	major = register_chrdev(0, RTLX_MODULE_NAME, &rtlx_fops);
92	if (major < 0) {
93	pr_err("rtlx_module_init: unable to register device\n");
94	return major;
95	}
96
97	/* initialise the wait queues */
98	for (i = 0; i < RTLX_CHANNELS; i++) {
99	init_waitqueue_head(&channel_wqs[i].rt_queue);
100	init_waitqueue_head(&channel_wqs[i].lx_queue);
101	atomic_set(&channel_wqs[i].in_open, 0);
102	mutex_init(&channel_wqs[i].mutex);
103
104	dev = device_create(mt_class, NULL, MKDEV(major, i), NULL,
105	"%s%d", RTLX_MODULE_NAME, i);
106	if (IS_ERR(dev)) {
107	err = PTR_ERR(dev);
108	goto out_chrdev;
109	}
110	}
111
112	/* set up notifiers */
113	rtlx_notify.start = rtlx_starting;
114	rtlx_notify.stop = rtlx_stopping;
115	vpe_notify(aprp_cpu_index(), &rtlx_notify);
116
117	if (cpu_has_vint) {
118	aprp_hook = rtlx_dispatch;
119	} else {
120	pr_err("APRP RTLX init on non-vectored-interrupt processor\n");
121	err = -ENODEV;
122	goto out_class;
123	}
124
125	rtlx_irq.dev_id = rtlx;
126	err = setup_irq(rtlx_irq_num, &rtlx_irq);
127	if (err)
128	goto out_class;
129
130	return 0;
131
132	out_class:
133	for (i = 0; i < RTLX_CHANNELS; i++)
134	device_destroy(mt_class, MKDEV(major, i));
135	out_chrdev:
136	unregister_chrdev(major, RTLX_MODULE_NAME);
137
138	return err;
139	}
140
141	void __exit rtlx_module_exit(void)
142	{
143	int i;
144
145	for (i = 0; i < RTLX_CHANNELS; i++)
146	device_destroy(mt_class, MKDEV(major, i));
147	unregister_chrdev(major, RTLX_MODULE_NAME);
148	}