summaryrefslogtreecommitdiffstats
path: root/arch/mips/netlogic/common/irq.c
blob: 00dcc7a2bc5a5d912a60274e36958af8a1ba86d9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
/*
 * Copyright 2003-2011 NetLogic Microsystems, Inc. (NetLogic). All rights
 * reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the NetLogic
 * license below:
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY NETLOGIC ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/linkage.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/irq.h>

#include <asm/errno.h>
#include <asm/signal.h>
#include <asm/ptrace.h>
#include <asm/mipsregs.h>
#include <asm/thread_info.h>

#include <asm/netlogic/mips-extns.h>
#include <asm/netlogic/interrupt.h>
#include <asm/netlogic/haldefs.h>
#include <asm/netlogic/common.h>

#if defined(CONFIG_CPU_XLP)
#include <asm/netlogic/xlp-hal/iomap.h>
#include <asm/netlogic/xlp-hal/xlp.h>
#include <asm/netlogic/xlp-hal/pic.h>
#elif defined(CONFIG_CPU_XLR)
#include <asm/netlogic/xlr/iomap.h>
#include <asm/netlogic/xlr/pic.h>
#include <asm/netlogic/xlr/fmn.h>
#else
#error "Unknown CPU"
#endif

#ifdef CONFIG_SMP
#define SMP_IRQ_MASK	((1ULL << IRQ_IPI_SMP_FUNCTION) | \
				 (1ULL << IRQ_IPI_SMP_RESCHEDULE))
#else
#define SMP_IRQ_MASK	0
#endif
#define PERCPU_IRQ_MASK	(SMP_IRQ_MASK | (1ull << IRQ_TIMER) | \
				(1ull << IRQ_FMN))

struct nlm_pic_irq {
	void	(*extra_ack)(struct irq_data *);
	struct	nlm_soc_info *node;
	int	picirq;
	int	irt;
	int	flags;
};

static void xlp_pic_enable(struct irq_data *d)
{
	unsigned long flags;
	struct nlm_pic_irq *pd = irq_data_get_irq_handler_data(d);

	BUG_ON(!pd);
	spin_lock_irqsave(&pd->node->piclock, flags);
	nlm_pic_enable_irt(pd->node->picbase, pd->irt);
	spin_unlock_irqrestore(&pd->node->piclock, flags);
}

static void xlp_pic_disable(struct irq_data *d)
{
	struct nlm_pic_irq *pd = irq_data_get_irq_handler_data(d);
	unsigned long flags;

	BUG_ON(!pd);
	spin_lock_irqsave(&pd->node->piclock, flags);
	nlm_pic_disable_irt(pd->node->picbase, pd->irt);
	spin_unlock_irqrestore(&pd->node->piclock, flags);
}

static void xlp_pic_mask_ack(struct irq_data *d)
{
	struct nlm_pic_irq *pd = irq_data_get_irq_handler_data(d);
	uint64_t mask = 1ull << pd->picirq;

	write_c0_eirr(mask);            /* ack by writing EIRR */
}

static void xlp_pic_unmask(struct irq_data *d)
{
	struct nlm_pic_irq *pd = irq_data_get_irq_handler_data(d);

	if (!pd)
		return;

	if (pd->extra_ack)
		pd->extra_ack(d);

	/* Ack is a single write, no need to lock */
	nlm_pic_ack(pd->node->picbase, pd->irt);
}

static struct irq_chip xlp_pic = {
	.name		= "XLP-PIC",
	.irq_enable	= xlp_pic_enable,
	.irq_disable	= xlp_pic_disable,
	.irq_mask_ack	= xlp_pic_mask_ack,
	.irq_unmask	= xlp_pic_unmask,
};

static void cpuintr_disable(struct irq_data *d)
{
	uint64_t eimr;
	uint64_t mask = 1ull << d->irq;

	eimr = read_c0_eimr();
	write_c0_eimr(eimr & ~mask);
}

static void cpuintr_enable(struct irq_data *d)
{
	uint64_t eimr;
	uint64_t mask = 1ull << d->irq;

	eimr = read_c0_eimr();
	write_c0_eimr(eimr | mask);
}

static void cpuintr_ack(struct irq_data *d)
{
	uint64_t mask = 1ull << d->irq;

	write_c0_eirr(mask);
}

static void cpuintr_nop(struct irq_data *d)
{
	WARN(d->irq >= PIC_IRQ_BASE, "Bad irq %d", d->irq);
}

/*
 * Chip definition for CPU originated interrupts(timer, msg) and
 * IPIs
 */
struct irq_chip nlm_cpu_intr = {
	.name		= "XLP-CPU-INTR",
	.irq_enable	= cpuintr_enable,
	.irq_disable	= cpuintr_disable,
	.irq_mask	= cpuintr_nop,
	.irq_ack	= cpuintr_nop,
	.irq_eoi	= cpuintr_ack,
};

static void __init nlm_init_percpu_irqs(void)
{
	int i;

	for (i = 0; i < PIC_IRT_FIRST_IRQ; i++)
		irq_set_chip_and_handler(i, &nlm_cpu_intr, handle_percpu_irq);
#ifdef CONFIG_SMP
	irq_set_chip_and_handler(IRQ_IPI_SMP_FUNCTION, &nlm_cpu_intr,
			 nlm_smp_function_ipi_handler);
	irq_set_chip_and_handler(IRQ_IPI_SMP_RESCHEDULE, &nlm_cpu_intr,
			 nlm_smp_resched_ipi_handler);
#endif
}

void nlm_setup_pic_irq(int node, int picirq, int irq, int irt)
{
	struct nlm_pic_irq *pic_data;
	int xirq;

	xirq = nlm_irq_to_xirq(node, irq);
	pic_data = kzalloc(sizeof(*pic_data), GFP_KERNEL);
	BUG_ON(pic_data == NULL);
	pic_data->irt = irt;
	pic_data->picirq = picirq;
	pic_data->node = nlm_get_node(node);
	irq_set_chip_and_handler(xirq, &xlp_pic, handle_level_irq);
	irq_set_handler_data(xirq, pic_data);
}

void nlm_set_pic_extra_ack(int node, int irq, void (*xack)(struct irq_data *))
{
	struct nlm_pic_irq *pic_data;
	int xirq;

	xirq = nlm_irq_to_xirq(node, irq);
	pic_data = irq_get_handler_data(xirq);
	pic_data->extra_ack = xack;
}

static void nlm_init_node_irqs(int node)
{
	int i, irt;
	uint64_t irqmask;
	struct nlm_soc_info *nodep;

	pr_info("Init IRQ for node %d\n", node);
	nodep = nlm_get_node(node);
	irqmask = PERCPU_IRQ_MASK;
	for (i = PIC_IRT_FIRST_IRQ; i <= PIC_IRT_LAST_IRQ; i++) {
		irt = nlm_irq_to_irt(i);
		if (irt == -1)
			continue;
		nlm_setup_pic_irq(node, i, i, irt);
		/* set interrupts to first cpu in node */
		nlm_pic_init_irt(nodep->picbase, irt, i,
					node * NLM_CPUS_PER_NODE);
		irqmask |= (1ull << i);
	}
	nodep->irqmask = irqmask;
}

void __init arch_init_irq(void)
{
	/* Initialize the irq descriptors */
	nlm_init_percpu_irqs();
	nlm_init_node_irqs(0);
	write_c0_eimr(nlm_current_node()->irqmask);
#if defined(CONFIG_CPU_XLR)
	nlm_setup_fmn_irq();
#endif
}

void nlm_smp_irq_init(int hwcpuid)
{
	int node, cpu;

	node = hwcpuid / NLM_CPUS_PER_NODE;
	cpu  = hwcpuid % NLM_CPUS_PER_NODE;

	if (cpu == 0 && node != 0)
		nlm_init_node_irqs(node);
	write_c0_eimr(nlm_current_node()->irqmask);
}

asmlinkage void plat_irq_dispatch(void)
{
	uint64_t eirr;
	int i, node;

	node = nlm_nodeid();
	eirr = read_c0_eirr() & read_c0_eimr();

	i = __ilog2_u64(eirr);
	if (i == -1)
		return;

	/* per-CPU IRQs don't need translation */
	if (eirr & PERCPU_IRQ_MASK) {
		do_IRQ(i);
		return;
	}

	/* top level irq handling */
	do_IRQ(nlm_irq_to_xirq(node, i));
}