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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.
*/
#include <arch/io.h>
#include <cbfs.h>
#include <console/console.h>
#include <soc/addressmap.h>
#include <soc/clock.h>
#include <soc/clk_rst.h>
#include <soc/ccplex.h>
#include <soc/cpu.h>
#include <soc/flow.h>
#include <soc/mc.h>
#include <soc/pmc.h>
#include <soc/power.h>
#include <soc/romstage.h>
#include <string.h>
#include <timer.h>
#define PMC_REGS (void *)(uintptr_t)(TEGRA_PMC_BASE)
#define MTS_FILE_NAME "mts"
static int ccplex_start(void)
{
struct stopwatch sw;
const long timeout_ms = 1500;
const uint32_t handshake_mask = 1;
const uint32_t cxreset1_mask = 1 << 21;
uint32_t reg;
struct tegra_pmc_regs * const pmc = PMC_REGS;
/* Set the handshake bit to be knocked down. */
write32(&pmc->scratch118, handshake_mask);
/* Assert nCXRSET[1] */
reg = read32(CLK_RST_REG(rst_cpu_cmplx_set));
reg |= cxreset1_mask;
write32(CLK_RST_REG(rst_cpu_cmplx_set), reg);
stopwatch_init_msecs_expire(&sw, timeout_ms);
while (1) {
reg = read32(&pmc->scratch118);
/* Wait for the bit to be knocked down. */
if ((reg & handshake_mask) != handshake_mask)
break;
if (stopwatch_expired(&sw)) {
printk(BIOS_DEBUG, "MTS handshake timeout.\n");
return -1;
}
}
printk(BIOS_DEBUG, "MTS handshake took %ld usecs.\n",
stopwatch_duration_usecs(&sw));
return 0;
}
int ccplex_load_mts(void)
{
ssize_t nread;
struct stopwatch sw;
struct region_device fh;
/*
* MTS location is hard coded to this magic address. The hardware will
* take the MTS from this location and place it in the final resting
* place in the carveout region.
*/
void * const mts = (void *)(uintptr_t)MTS_LOAD_ADDRESS;
stopwatch_init(&sw);
if (cbfs_boot_locate(&fh, MTS_FILE_NAME, NULL)) {
printk(BIOS_DEBUG, "MTS file not found: %s\n", MTS_FILE_NAME);
return -1;
}
/* Read MTS file into the carveout region. */
nread = rdev_readat(&fh, mts, 0, region_device_sz(&fh));
if (nread != region_device_sz(&fh)) {
printk(BIOS_DEBUG, "MTS bytes read (%zu) != file length(%u)!\n",
nread, region_device_sz(&fh));
return -1;
}
printk(BIOS_DEBUG, "MTS: %zu bytes loaded @ %p in %ld usecs.\n",
nread, mts, stopwatch_duration_usecs(&sw));
return ccplex_start();
}
static void enable_cpu_clocks(void)
{
clock_enable(CLK_ENB_CPU, 0, 0, SET_CLK_ENB_CPUG_ENABLE |
SET_CLK_ENB_CPULP_ENABLE, 0, 0);
}
static void enable_cpu_power_partitions(void)
{
/* Bring up fast cluster, non-CPU, CPU0, and CPU1 partitions. */
power_ungate_partition(POWER_PARTID_CRAIL);
power_ungate_partition(POWER_PARTID_C0NC);
power_ungate_partition(POWER_PARTID_CE0);
power_ungate_partition(POWER_PARTID_CE1);
}
static void request_ram_repair(void)
{
struct flow_ctlr * const flow = (void *)(uintptr_t)TEGRA_FLOW_BASE;
const uint32_t req = 1 << 0;
const uint32_t sts = 1 << 1;
uint32_t reg;
struct stopwatch sw;
printk(BIOS_DEBUG, "Requesting RAM repair.\n");
stopwatch_init(&sw);
/* Perform cluster 0 ram repair */
reg = read32(&flow->ram_repair);
reg |= req;
write32(&flow->ram_repair, reg);
while ((read32(&flow->ram_repair) & sts) != sts)
;
/* Perform cluster 1 ram repair */
reg = read32(&flow->ram_repair_cluster1);
reg |= req;
write32(&flow->ram_repair_cluster1, reg);
while ((read32(&flow->ram_repair_cluster1) & sts) != sts)
;
printk(BIOS_DEBUG, "RAM repair complete in %ld usecs.\n",
stopwatch_duration_usecs(&sw));
}
void ccplex_cpu_prepare(void)
{
enable_cpu_clocks();
enable_cpu_power_partitions();
mainboard_configure_pmc();
mainboard_enable_vdd_cpu();
request_ram_repair();
}
static void start_common_clocks(void)
{
/* Clear fast CPU partition reset. */
write32(CLK_RST_REG(rst_cpug_cmplx_clr), CRC_RST_CPUG_CLR_NONCPU);
/* Clear reset of L2 and CoreSight components. */
write32(CLK_RST_REG(rst_cpug_cmplx_clr),
CRC_RST_CPUG_CLR_L2 | CRC_RST_CPUG_CLR_PDBG);
}
void ccplex_cpu_start(void *entry_addr)
{
/* Enable common clocks for the shared resources between the cores. */
start_common_clocks();
start_cpu(0, entry_addr);
}
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