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/*
* This file is part of the coreboot project.
*
* Copyright 2014 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <arch/io.h>
#include <stdlib.h>
#include <console/console.h>
#include <soc/addressmap.h>
#include <soc/display.h>
#include <soc/id.h>
#include "mc.h"
#include "sdram.h"
/* returns total amount of DRAM (in MB) from memory controller registers */
int sdram_size_mb(void)
{
struct tegra_mc_regs *mc = (struct tegra_mc_regs *)TEGRA_MC_BASE;
static int total_size = 0;
if (total_size)
return total_size;
/*
* This obtains memory size from the External Memory Aperture
* Configuration register. Nvidia confirmed that it is safe to assume
* this value represents the total physical DRAM size.
*/
total_size = (read32(&mc->emem_cfg) >> MC_EMEM_CFG_SIZE_MB_SHIFT) &
MC_EMEM_CFG_SIZE_MB_MASK;
printk(BIOS_DEBUG, "%s: Total SDRAM (MB): %u\n", __func__, total_size);
return total_size;
}
static void carveout_from_regs(uintptr_t *base_mib, size_t *size_mib,
uint32_t bom, uint32_t bom_hi, uint32_t size)
{
/* All size regs of carveouts are in MiB. */
if (size == 0)
return;
*size_mib = size;
bom >>= 20;
bom |= bom_hi >> (32 - 20);
*base_mib = bom;
}
void carveout_range(int id, uintptr_t *base_mib, size_t *size_mib)
{
*base_mib = 0;
*size_mib = 0;
struct tegra_mc_regs * const mc = (struct tegra_mc_regs *)TEGRA_MC_BASE;
switch (id) {
case CARVEOUT_TZ:
/* AVP does not have access to the TZ carveout registers. */
if (context_avp())
return;
carveout_from_regs(base_mib, size_mib,
read32(&mc->security_cfg0),
0,
read32(&mc->security_cfg1));
break;
case CARVEOUT_SEC:
carveout_from_regs(base_mib, size_mib,
read32(&mc->sec_carveout_bom),
read32(&mc->sec_carveout_adr_hi),
read32(&mc->sec_carveout_size_mb));
break;
case CARVEOUT_MTS:
carveout_from_regs(base_mib, size_mib,
read32(&mc->mts_carveout_bom),
read32(&mc->mts_carveout_adr_hi),
read32(&mc->mts_carveout_size_mb));
break;
case CARVEOUT_VPR:
carveout_from_regs(base_mib, size_mib,
read32(&mc->video_protect_bom),
read32(&mc->video_protect_bom_adr_hi),
read32(&mc->video_protect_size_mb));
break;
default:
break;
}
}
static void memory_in_range(uintptr_t *base_mib, uintptr_t *end_mib)
{
uintptr_t base;
uintptr_t end;
int i;
base = CONFIG_SYS_SDRAM_BASE / MiB;
end = base + sdram_size_mb();
/* Requested limits out of range. */
if (*end_mib <= base || *base_mib >= end) {
*end_mib = *base_mib = 0;
return;
}
/* Clip region to passed in limits. */
if (*end_mib < end)
end = *end_mib;
if (*base_mib > base)
base = *base_mib;
for (i = 0; i < CARVEOUT_NUM; i++) {
uintptr_t carveout_base;
uintptr_t carveout_end;
size_t carveout_size;
carveout_range(i, &carveout_base, &carveout_size);
if (carveout_size == 0)
continue;
carveout_end = carveout_base + carveout_size;
/* Bypass carveouts out of requested range. */
if (carveout_base >= end || carveout_end <= base)
continue;
/*
* This is crude, but the assumption is that carveouts live
* at the upper range of physical memory. Therefore, update
* the end address to be equal to the base of the carveout.
*/
end = carveout_base;
}
*base_mib = base;
*end_mib = end;
}
void memory_in_range_below_4gb(uintptr_t *base_mib, uintptr_t *end_mib)
{
*base_mib = 0;
*end_mib = 4096;
memory_in_range(base_mib, end_mib);
}
void memory_in_range_above_4gb(uintptr_t *base_mib, uintptr_t *end_mib)
{
*base_mib = 4096;
*end_mib = ~0UL;
memory_in_range(base_mib, end_mib);
}
uintptr_t framebuffer_attributes(size_t *size_mib)
{
uintptr_t begin;
uintptr_t end;
/* Place the framebuffer just below the 32-bit addressable limit. */
memory_in_range_below_4gb(&begin, &end);
/*
* Need to take into account that the Trust Zone region is not able to
* be read by the AVP. The Trust Zone region will live just below the
* rest of the carveout regions.
*/
if (context_avp())
end -= CONFIG_TRUSTZONE_CARVEOUT_SIZE_MB;
*size_mib = FB_SIZE_MB;
end -= *size_mib;
return end;
}
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