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/*
* arch/arm/mach-tegra/tegra_emc.c
*
* Copyright (c) 2013-2014, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/tegra-soc.h>
#include <mach/tegra_emc.h>
#include "tegra12_emc.h"
u8 tegra_emc_iso_share = 100;
static unsigned long emc_iso_allocation;
static unsigned long last_iso_bw;
static struct emc_iso_usage emc_usage_table[TEGRA_EMC_ISO_USE_CASES_MAX_NUM];
u32 tegra_get_dvfs_clk_change_latency_nsec(unsigned long emc_freq_khz)
{
switch (tegra_get_chipid()) {
case TEGRA_CHIPID_TEGRA12:
case TEGRA_CHIPID_TEGRA13:
return tegra12_get_dvfs_clk_change_latency_nsec(emc_freq_khz);
default:
return 0;
}
}
void __init tegra_emc_iso_usage_table_init(struct emc_iso_usage *table,
int size)
{
size = min(size, TEGRA_EMC_ISO_USE_CASES_MAX_NUM);
if (size && table)
memcpy(emc_usage_table, table,
size * sizeof(struct emc_iso_usage));
}
static u8 tegra_emc_get_iso_share(u32 usage_flags, unsigned long iso_bw)
{
int i;
u8 iso_share = 100;
if (usage_flags) {
for (i = 0; i < TEGRA_EMC_ISO_USE_CASES_MAX_NUM; i++) {
struct emc_iso_usage *iso_usage = &emc_usage_table[i];
u32 flags = iso_usage->emc_usage_flags;
u8 share = iso_usage->iso_usage_share;
if (!flags)
continue;
if (iso_usage->iso_share_calculator)
share = iso_usage->iso_share_calculator(iso_bw);
if (!share) {
WARN(1, "%s: entry %d: iso_share 0\n",
__func__, i);
continue;
}
if ((flags & usage_flags) == flags)
iso_share = min(iso_share, share);
}
}
last_iso_bw = iso_bw;
tegra_emc_iso_share = iso_share;
return iso_share;
}
unsigned long tegra_emc_apply_efficiency(unsigned long total_bw,
unsigned long iso_bw, unsigned long max_rate, u32 usage_flags,
unsigned long *iso_bw_min)
{
u8 efficiency = tegra_emc_get_iso_share(usage_flags, iso_bw);
if (iso_bw && efficiency && (efficiency < 100)) {
iso_bw /= efficiency;
iso_bw = (iso_bw < max_rate / 100) ?
(iso_bw * 100) : max_rate;
}
emc_iso_allocation = iso_bw;
if (iso_bw_min)
*iso_bw_min = iso_bw;
efficiency = tegra_emc_bw_efficiency;
if (total_bw && efficiency && (efficiency < 100)) {
total_bw = total_bw / efficiency;
total_bw = (total_bw < max_rate / 100) ?
(total_bw * 100) : max_rate;
}
return max(total_bw, iso_bw);
}
#ifdef CONFIG_DEBUG_FS
#define USER_NAME(module) \
[EMC_USER_##module] = #module
static const char *emc_user_names[EMC_USER_NUM] = {
USER_NAME(DC1),
USER_NAME(DC2),
USER_NAME(VI),
USER_NAME(MSENC),
USER_NAME(2D),
USER_NAME(3D),
USER_NAME(BB),
};
static int emc_usage_table_show(struct seq_file *s, void *data)
{
int i, j;
seq_printf(s, "EMC USAGE\t\tISO SHARE %% @ last bw %lu\n", last_iso_bw);
for (i = 0; i < TEGRA_EMC_ISO_USE_CASES_MAX_NUM; i++) {
u32 flags = emc_usage_table[i].emc_usage_flags;
u8 share = emc_usage_table[i].iso_usage_share;
bool fixed_share = true;
bool first = false;
if (emc_usage_table[i].iso_share_calculator) {
share = emc_usage_table[i].iso_share_calculator(
last_iso_bw);
fixed_share = false;
}
seq_printf(s, "[%d]: ", i);
if (!flags) {
seq_printf(s, "reserved\n");
continue;
}
for (j = 0; j < EMC_USER_NUM; j++) {
u32 mask = 0x1 << j;
if (!(flags & mask))
continue;
seq_printf(s, "%s%s", first ? "+" : "",
emc_user_names[j]);
first = true;
}
seq_printf(s, "\r\t\t\t= %d(%s across bw)\n",
share, fixed_share ? "fixed" : "vary");
}
return 0;
}
static int emc_usage_table_open(struct inode *inode, struct file *file)
{
return single_open(file, emc_usage_table_show, inode->i_private);
}
static const struct file_operations emc_usage_table_fops = {
.open = emc_usage_table_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
int __init tegra_emc_iso_usage_debugfs_init(struct dentry *emc_debugfs_root)
{
struct dentry *d;
d = debugfs_create_file("emc_usage_table", S_IRUGO, emc_debugfs_root,
NULL, &emc_usage_table_fops);
if (!d)
return -ENOMEM;
d = debugfs_create_u8("emc_iso_share", S_IRUGO, emc_debugfs_root,
&tegra_emc_iso_share);
if (!d)
return -ENOMEM;
d = debugfs_create_u32("emc_iso_allocation", S_IRUGO, emc_debugfs_root,
(u32 *)&emc_iso_allocation);
if (!d)
return -ENOMEM;
return 0;
}
#endif
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