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
|
/*
* Copyright (c) 2003-2012 Broadcom Corporation
* 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 Broadcom
* 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 BROADCOM ``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 BROADCOM 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/irqreturn.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <asm/mipsregs.h>
#include <asm/netlogic/interrupt.h>
#include <asm/netlogic/xlr/fmn.h>
#include <asm/netlogic/common.h>
#define COP2_CC_INIT_CPU_DEST(dest, conf) \
do { \
nlm_write_c2_cc##dest(0, conf[(dest * 8) + 0]); \
nlm_write_c2_cc##dest(1, conf[(dest * 8) + 1]); \
nlm_write_c2_cc##dest(2, conf[(dest * 8) + 2]); \
nlm_write_c2_cc##dest(3, conf[(dest * 8) + 3]); \
nlm_write_c2_cc##dest(4, conf[(dest * 8) + 4]); \
nlm_write_c2_cc##dest(5, conf[(dest * 8) + 5]); \
nlm_write_c2_cc##dest(6, conf[(dest * 8) + 6]); \
nlm_write_c2_cc##dest(7, conf[(dest * 8) + 7]); \
} while (0)
struct fmn_message_handler {
void (*action)(int, int, int, int, struct nlm_fmn_msg *, void *);
void *arg;
} msg_handlers[128];
/*
* FMN interrupt handler. We configure the FMN so that any messages in
* any of the CPU buckets will trigger an interrupt on the CPU.
* The message can be from any device on the FMN (like NAE/SAE/DMA).
* The source station id is used to figure out which of the registered
* handlers have to be called.
*/
static irqreturn_t fmn_message_handler(int irq, void *data)
{
struct fmn_message_handler *hndlr;
int bucket, rv;
int size = 0, code = 0, src_stnid = 0;
struct nlm_fmn_msg msg;
uint32_t mflags, bkt_status;
mflags = nlm_cop2_enable_irqsave();
/* Disable message ring interrupt */
nlm_fmn_setup_intr(irq, 0);
while (1) {
/* 8 bkts per core, [24:31] each bit represents one bucket
* Bit is Zero if bucket is not empty */
bkt_status = (nlm_read_c2_status0() >> 24) & 0xff;
if (bkt_status == 0xff)
break;
for (bucket = 0; bucket < 8; bucket++) {
/* Continue on empty bucket */
if (bkt_status & (1 << bucket))
continue;
rv = nlm_fmn_receive(bucket, &size, &code, &src_stnid,
&msg);
if (rv != 0)
continue;
hndlr = &msg_handlers[src_stnid];
if (hndlr->action == NULL)
pr_warn("No msgring handler for stnid %d\n",
src_stnid);
else {
nlm_cop2_disable_irqrestore(mflags);
hndlr->action(bucket, src_stnid, size, code,
&msg, hndlr->arg);
mflags = nlm_cop2_enable_irqsave();
}
}
};
/* Enable message ring intr, to any thread in core */
nlm_fmn_setup_intr(irq, (1 << nlm_threads_per_core) - 1);
nlm_cop2_disable_irqrestore(mflags);
return IRQ_HANDLED;
}
struct irqaction fmn_irqaction = {
.handler = fmn_message_handler,
.flags = IRQF_PERCPU,
.name = "fmn",
};
void xlr_percpu_fmn_init(void)
{
struct xlr_fmn_info *cpu_fmn_info;
int *bucket_sizes;
uint32_t flags;
int id;
BUG_ON(nlm_thread_id() != 0);
id = nlm_core_id();
bucket_sizes = xlr_board_fmn_config.bucket_size;
cpu_fmn_info = &xlr_board_fmn_config.cpu[id];
flags = nlm_cop2_enable_irqsave();
/* Setup bucket sizes for the core. */
nlm_write_c2_bucksize(0, bucket_sizes[id * 8 + 0]);
nlm_write_c2_bucksize(1, bucket_sizes[id * 8 + 1]);
nlm_write_c2_bucksize(2, bucket_sizes[id * 8 + 2]);
nlm_write_c2_bucksize(3, bucket_sizes[id * 8 + 3]);
nlm_write_c2_bucksize(4, bucket_sizes[id * 8 + 4]);
nlm_write_c2_bucksize(5, bucket_sizes[id * 8 + 5]);
nlm_write_c2_bucksize(6, bucket_sizes[id * 8 + 6]);
nlm_write_c2_bucksize(7, bucket_sizes[id * 8 + 7]);
/*
* For sending FMN messages, we need credits on the destination
* bucket. Program the credits this core has on the 128 possible
* destination buckets.
* We cannot use a loop here, because the the first argument has
* to be a constant integer value.
*/
COP2_CC_INIT_CPU_DEST(0, cpu_fmn_info->credit_config);
COP2_CC_INIT_CPU_DEST(1, cpu_fmn_info->credit_config);
COP2_CC_INIT_CPU_DEST(2, cpu_fmn_info->credit_config);
COP2_CC_INIT_CPU_DEST(3, cpu_fmn_info->credit_config);
COP2_CC_INIT_CPU_DEST(4, cpu_fmn_info->credit_config);
COP2_CC_INIT_CPU_DEST(5, cpu_fmn_info->credit_config);
COP2_CC_INIT_CPU_DEST(6, cpu_fmn_info->credit_config);
COP2_CC_INIT_CPU_DEST(7, cpu_fmn_info->credit_config);
COP2_CC_INIT_CPU_DEST(8, cpu_fmn_info->credit_config);
COP2_CC_INIT_CPU_DEST(9, cpu_fmn_info->credit_config);
COP2_CC_INIT_CPU_DEST(10, cpu_fmn_info->credit_config);
COP2_CC_INIT_CPU_DEST(11, cpu_fmn_info->credit_config);
COP2_CC_INIT_CPU_DEST(12, cpu_fmn_info->credit_config);
COP2_CC_INIT_CPU_DEST(13, cpu_fmn_info->credit_config);
COP2_CC_INIT_CPU_DEST(14, cpu_fmn_info->credit_config);
COP2_CC_INIT_CPU_DEST(15, cpu_fmn_info->credit_config);
/* enable FMN interrupts on this CPU */
nlm_fmn_setup_intr(IRQ_FMN, (1 << nlm_threads_per_core) - 1);
nlm_cop2_disable_irqrestore(flags);
}
/*
* Register a FMN message handler with respect to the source station id
* @stnid: source station id
* @action: Handler function pointer
*/
int nlm_register_fmn_handler(int start_stnid, int end_stnid,
void (*action)(int, int, int, int, struct nlm_fmn_msg *, void *),
void *arg)
{
int sstnid;
for (sstnid = start_stnid; sstnid <= end_stnid; sstnid++) {
msg_handlers[sstnid].arg = arg;
smp_wmb();
msg_handlers[sstnid].action = action;
}
pr_debug("Registered FMN msg handler for stnid %d-%d\n",
start_stnid, end_stnid);
return 0;
}
void nlm_setup_fmn_irq(void)
{
uint32_t flags;
/* setup irq only once */
setup_irq(IRQ_FMN, &fmn_irqaction);
flags = nlm_cop2_enable_irqsave();
nlm_fmn_setup_intr(IRQ_FMN, (1 << nlm_threads_per_core) - 1);
nlm_cop2_disable_irqrestore(flags);
}
|
