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linux-next/arch/mips/netlogic/xlr/fmn-config.c
Ganesan Ramalingam ed21cfe207 MIPS: Netlogic: Support for XLR/XLS Fast Message Network 
On XLR/XLS, the cpu cores communicate with fast on-chip devices
(e.g. network accelerator, security engine etc.) using the Fast
Messaging Network(FMN). The FMN queues and credits needs to be
configured and intialized before it can be used.

The co-processor 2 on XLR/XLS CPU cores has registers for FMN access,
and the XLR/XLS has custom instructions for sending and loading
messages.  The FMN can deliver also per-cpu interrupts when messages
are available at the CPU.

This patch adds FMN initialization, adds interrupt setup and handling,
and also provides support for sending and receiving FMN messages.

Signed-off-by: Ganesan Ramalingam <ganesanr@broadcom.com>
Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Patchwork: http://patchwork.linux-mips.org/patch/4468
Signed-off-by: John Crispin <blogic@openwrt.org>
2012-11-09 11:37:20 +01:00

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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 <asm/cpu-info.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <asm/mipsregs.h>
#include <asm/netlogic/xlr/fmn.h>
#include <asm/netlogic/xlr/xlr.h>
#include <asm/netlogic/common.h>
#include <asm/netlogic/haldefs.h>
struct xlr_board_fmn_config xlr_board_fmn_config;
static void __maybe_unused print_credit_config(struct xlr_fmn_info *fmn_info)
{
int bkt;
pr_info("Bucket size :\n");
pr_info("Station\t: Size\n");
for (bkt = 0; bkt < 16; bkt++)
pr_info(" %d %d %d %d %d %d %d %d\n",
xlr_board_fmn_config.bucket_size[(bkt * 8) + 0],
xlr_board_fmn_config.bucket_size[(bkt * 8) + 1],
xlr_board_fmn_config.bucket_size[(bkt * 8) + 2],
xlr_board_fmn_config.bucket_size[(bkt * 8) + 3],
xlr_board_fmn_config.bucket_size[(bkt * 8) + 4],
xlr_board_fmn_config.bucket_size[(bkt * 8) + 5],
xlr_board_fmn_config.bucket_size[(bkt * 8) + 6],
xlr_board_fmn_config.bucket_size[(bkt * 8) + 7]);
pr_info("\n");
pr_info("Credits distribution :\n");
pr_info("Station\t: Size\n");
for (bkt = 0; bkt < 16; bkt++)
pr_info(" %d %d %d %d %d %d %d %d\n",
fmn_info->credit_config[(bkt * 8) + 0],
fmn_info->credit_config[(bkt * 8) + 1],
fmn_info->credit_config[(bkt * 8) + 2],
fmn_info->credit_config[(bkt * 8) + 3],
fmn_info->credit_config[(bkt * 8) + 4],
fmn_info->credit_config[(bkt * 8) + 5],
fmn_info->credit_config[(bkt * 8) + 6],
fmn_info->credit_config[(bkt * 8) + 7]);
pr_info("\n");
}
static void check_credit_distribution(void)
{
struct xlr_board_fmn_config *cfg = &xlr_board_fmn_config;
int bkt, n, total_credits, ncores;
ncores = hweight32(nlm_current_node()->coremask);
for (bkt = 0; bkt < 128; bkt++) {
total_credits = 0;
for (n = 0; n < ncores; n++)
total_credits += cfg->cpu[n].credit_config[bkt];
total_credits += cfg->gmac[0].credit_config[bkt];
total_credits += cfg->gmac[1].credit_config[bkt];
total_credits += cfg->dma.credit_config[bkt];
total_credits += cfg->cmp.credit_config[bkt];
total_credits += cfg->sae.credit_config[bkt];
total_credits += cfg->xgmac[0].credit_config[bkt];
total_credits += cfg->xgmac[1].credit_config[bkt];
if (total_credits > cfg->bucket_size[bkt])
pr_err("ERROR: Bucket %d: credits (%d) > size (%d)\n",
bkt, total_credits, cfg->bucket_size[bkt]);
}
pr_info("Credit distribution complete.\n");
}
/**
* Configure bucket size and credits for a device. 'size' is the size of
* the buckets for the device. This size is distributed among all the CPUs
* so that all of them can send messages to the device.
*
* The device is also given 'cpu_credits' to send messages to the CPUs
*
* @dev_info: FMN information structure for each devices
* @start_stn_id: Starting station id of dev_info
* @end_stn_id: End station id of dev_info
* @num_buckets: Total number of buckets for den_info
* @cpu_credits: Allowed credits to cpu for each devices pointing by dev_info
* @size: Size of the each buckets in the device station
*/
static void setup_fmn_cc(struct xlr_fmn_info *dev_info, int start_stn_id,
int end_stn_id, int num_buckets, int cpu_credits, int size)
{
int i, j, num_core, n, credits_per_cpu;
struct xlr_fmn_info *cpu = xlr_board_fmn_config.cpu;
num_core = hweight32(nlm_current_node()->coremask);
dev_info->num_buckets = num_buckets;
dev_info->start_stn_id = start_stn_id;
dev_info->end_stn_id = end_stn_id;
n = num_core;
if (num_core == 3)
n = 4;
for (i = start_stn_id; i <= end_stn_id; i++) {
xlr_board_fmn_config.bucket_size[i] = size;
/* Dividing device credits equally to cpus */
credits_per_cpu = size / n;
for (j = 0; j < num_core; j++)
cpu[j].credit_config[i] = credits_per_cpu;
/* credits left to distribute */
credits_per_cpu = size - (credits_per_cpu * num_core);
/* distribute the remaining credits (if any), among cores */
for (j = 0; (j < num_core) && (credits_per_cpu >= 4); j++) {
cpu[j].credit_config[i] += 4;
credits_per_cpu -= 4;
}
}
/* Distributing cpu per bucket credits to devices */
for (i = 0; i < num_core; i++) {
for (j = 0; j < FMN_CORE_NBUCKETS; j++)
dev_info->credit_config[(i * 8) + j] = cpu_credits;
}
}
/*
* Each core has 256 slots and 8 buckets,
* Configure the 8 buckets each with 32 slots
*/
static void setup_cpu_fmninfo(struct xlr_fmn_info *cpu, int num_core)
{
int i, j;
for (i = 0; i < num_core; i++) {
cpu[i].start_stn_id = (8 * i);
cpu[i].end_stn_id = (8 * i + 8);
for (j = cpu[i].start_stn_id; j < cpu[i].end_stn_id; j++)
xlr_board_fmn_config.bucket_size[j] = 32;
}
}
/**
* Setup the FMN details for each devices according to the device available
* in each variant of XLR/XLS processor
*/
void xlr_board_info_setup(void)
{
struct xlr_fmn_info *cpu = xlr_board_fmn_config.cpu;
struct xlr_fmn_info *gmac = xlr_board_fmn_config.gmac;
struct xlr_fmn_info *xgmac = xlr_board_fmn_config.xgmac;
struct xlr_fmn_info *dma = &xlr_board_fmn_config.dma;
struct xlr_fmn_info *cmp = &xlr_board_fmn_config.cmp;
struct xlr_fmn_info *sae = &xlr_board_fmn_config.sae;
int processor_id, num_core;
num_core = hweight32(nlm_current_node()->coremask);
processor_id = read_c0_prid() & 0xff00;
setup_cpu_fmninfo(cpu, num_core);
switch (processor_id) {
case PRID_IMP_NETLOGIC_XLS104:
case PRID_IMP_NETLOGIC_XLS108:
setup_fmn_cc(&gmac[0], FMN_STNID_GMAC0,
FMN_STNID_GMAC0_TX3, 8, 16, 32);
setup_fmn_cc(dma, FMN_STNID_DMA_0,
FMN_STNID_DMA_3, 4, 8, 64);
setup_fmn_cc(sae, FMN_STNID_SEC0,
FMN_STNID_SEC1, 2, 8, 128);
break;
case PRID_IMP_NETLOGIC_XLS204:
case PRID_IMP_NETLOGIC_XLS208:
setup_fmn_cc(&gmac[0], FMN_STNID_GMAC0,
FMN_STNID_GMAC0_TX3, 8, 16, 32);
setup_fmn_cc(dma, FMN_STNID_DMA_0,
FMN_STNID_DMA_3, 4, 8, 64);
setup_fmn_cc(sae, FMN_STNID_SEC0,
FMN_STNID_SEC1, 2, 8, 128);
break;
case PRID_IMP_NETLOGIC_XLS404:
case PRID_IMP_NETLOGIC_XLS408:
case PRID_IMP_NETLOGIC_XLS404B:
case PRID_IMP_NETLOGIC_XLS408B:
case PRID_IMP_NETLOGIC_XLS416B:
setup_fmn_cc(&gmac[0], FMN_STNID_GMAC0,
FMN_STNID_GMAC0_TX3, 8, 8, 32);
setup_fmn_cc(&gmac[1], FMN_STNID_GMAC1_FR_0,
FMN_STNID_GMAC1_TX3, 8, 8, 32);
setup_fmn_cc(dma, FMN_STNID_DMA_0,
FMN_STNID_DMA_3, 4, 4, 64);
setup_fmn_cc(cmp, FMN_STNID_CMP_0,
FMN_STNID_CMP_3, 4, 4, 64);
setup_fmn_cc(sae, FMN_STNID_SEC0,
FMN_STNID_SEC1, 2, 8, 128);
break;
case PRID_IMP_NETLOGIC_XLS412B:
setup_fmn_cc(&gmac[0], FMN_STNID_GMAC0,
FMN_STNID_GMAC0_TX3, 8, 8, 32);
setup_fmn_cc(&gmac[1], FMN_STNID_GMAC1_FR_0,
FMN_STNID_GMAC1_TX3, 8, 8, 32);
setup_fmn_cc(dma, FMN_STNID_DMA_0,
FMN_STNID_DMA_3, 4, 4, 64);
setup_fmn_cc(cmp, FMN_STNID_CMP_0,
FMN_STNID_CMP_3, 4, 4, 64);
setup_fmn_cc(sae, FMN_STNID_SEC0,
FMN_STNID_SEC1, 2, 8, 128);
break;
case PRID_IMP_NETLOGIC_XLR308:
case PRID_IMP_NETLOGIC_XLR308C:
setup_fmn_cc(&gmac[0], FMN_STNID_GMAC0,
FMN_STNID_GMAC0_TX3, 8, 16, 32);
setup_fmn_cc(dma, FMN_STNID_DMA_0,
FMN_STNID_DMA_3, 4, 8, 64);
setup_fmn_cc(sae, FMN_STNID_SEC0,
FMN_STNID_SEC1, 2, 4, 128);
break;
case PRID_IMP_NETLOGIC_XLR532:
case PRID_IMP_NETLOGIC_XLR532C:
case PRID_IMP_NETLOGIC_XLR516C:
case PRID_IMP_NETLOGIC_XLR508C:
setup_fmn_cc(&gmac[0], FMN_STNID_GMAC0,
FMN_STNID_GMAC0_TX3, 8, 16, 32);
setup_fmn_cc(dma, FMN_STNID_DMA_0,
FMN_STNID_DMA_3, 4, 8, 64);
setup_fmn_cc(sae, FMN_STNID_SEC0,
FMN_STNID_SEC1, 2, 4, 128);
break;
case PRID_IMP_NETLOGIC_XLR732:
case PRID_IMP_NETLOGIC_XLR716:
setup_fmn_cc(&xgmac[0], FMN_STNID_XMAC0_00_TX,
FMN_STNID_XMAC0_15_TX, 8, 0, 32);
setup_fmn_cc(&xgmac[1], FMN_STNID_XMAC1_00_TX,
FMN_STNID_XMAC1_15_TX, 8, 0, 32);
setup_fmn_cc(&gmac[0], FMN_STNID_GMAC0,
FMN_STNID_GMAC0_TX3, 8, 24, 32);
setup_fmn_cc(dma, FMN_STNID_DMA_0,
FMN_STNID_DMA_3, 4, 4, 64);
setup_fmn_cc(sae, FMN_STNID_SEC0,
FMN_STNID_SEC1, 2, 4, 128);
break;
default:
pr_err("Unknown CPU with processor ID [%d]\n", processor_id);
pr_err("Error: Cannot initialize FMN credits.\n");
}
check_credit_distribution();
#if 0 /* debug */
print_credit_config(&cpu[0]);
print_credit_config(&gmac[0]);
#endif
}
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