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/*
* arch/arm/mach-tegra/mc.c
*
* Copyright (C) 2010 Google, Inc.
* Copyright (C) 2011-2012 NVIDIA Corporation
*
* Author:
* Erik Gilling <konkers@google.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*
*/
#include <linux/export.h>
#include <linux/io.h>
#include <linux/spinlock.h>
#include <mach/iomap.h>
#include <mach/mc.h>
#if defined(CONFIG_ARCH_TEGRA_2x_SOC)
static DEFINE_SPINLOCK(tegra_mc_lock);
void tegra_mc_set_priority(unsigned long client, unsigned long prio)
{
void __iomem *mc_base = (void __iomem *)IO_TO_VIRT(TEGRA_MC_BASE);
unsigned long reg = client >> 8;
int field = client & 0xff;
unsigned long val;
unsigned long flags;
spin_lock_irqsave(&tegra_mc_lock, flags);
val = readl(mc_base + reg);
val &= ~(TEGRA_MC_PRIO_MASK << field);
val |= prio << field;
writel(val, mc_base + reg);
spin_unlock_irqrestore(&tegra_mc_lock, flags);
}
int tegra_mc_get_tiled_memory_bandwidth_multiplier(void)
{
return 1;
}
#else
/* !!!FIXME!!! IMPLEMENT tegra_mc_set_priority() */
#include "tegra3_emc.h"
/*
* If using T30/DDR3, the 2nd 16 bytes part of DDR3 atom is 2nd line and is
* discarded in tiling mode.
*/
int tegra_mc_get_tiled_memory_bandwidth_multiplier(void)
{
int type;
type = tegra_emc_get_dram_type();
WARN_ONCE(type == -1, "unknown type DRAM because DVFS is disabled\n");
if (type == DRAM_TYPE_DDR3)
return 2;
else
return 1;
}
#endif
/* API to get EMC freq to be requested, for Bandwidth.
* bw_kbps: BandWidth passed is in KBps.
* returns freq in KHz
*/
unsigned int tegra_emc_bw_to_freq_req(unsigned int bw_kbps)
{
unsigned int freq;
unsigned int bytes_per_emc_clk;
bytes_per_emc_clk = tegra_mc_get_effective_bytes_width() * 2;
freq = (bw_kbps + bytes_per_emc_clk - 1) / bytes_per_emc_clk *
CONFIG_TEGRA_EMC_TO_DDR_CLOCK;
return freq;
}
EXPORT_SYMBOL_GPL(tegra_emc_bw_to_freq_req);
/* API to get EMC bandwidth, for freq that can be requested.
* freq_khz: Frequency passed is in KHz.
* returns bandwidth in KBps
*/
unsigned int tegra_emc_freq_req_to_bw(unsigned int freq_khz)
{
unsigned int bw;
unsigned int bytes_per_emc_clk;
bytes_per_emc_clk = tegra_mc_get_effective_bytes_width() * 2;
bw = freq_khz * bytes_per_emc_clk / CONFIG_TEGRA_EMC_TO_DDR_CLOCK;
return bw;
}
EXPORT_SYMBOL_GPL(tegra_emc_freq_req_to_bw);
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