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/*
* 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;
}
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;
/* request irq only once */
if (request_irq(IRQ_FMN, fmn_message_handler, IRQF_PERCPU, "fmn", NULL))
pr_err("Failed to request irq %d (fmn)\n", IRQ_FMN);
flags = nlm_cop2_enable_irqsave();
nlm_fmn_setup_intr(IRQ_FMN, (1 << nlm_threads_per_core) - 1);
nlm_cop2_disable_irqrestore(flags);
}
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