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/*
* This file is part of the coreboot project.
*
* Copyright 2013 Google Inc.
* Copyright (c) 2013, 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 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 <console/console.h>
#include <soc/addressmap.h>
#include "pmc.h"
#include "power.h"
static struct tegra_pmc_regs * const pmc = (void *)TEGRA_PMC_BASE;
static int partition_powered(int id)
{
return read32(&pmc->pwrgate_status) & (0x1 << id);
}
static void power_ungate_partition(uint32_t id)
{
printk(BIOS_INFO, "Ungating power partition %d.\n", id);
if (!partition_powered(id)) {
uint32_t pwrgate_toggle = read32(&pmc->pwrgate_toggle);
pwrgate_toggle &= ~(PMC_PWRGATE_TOGGLE_PARTID_MASK);
pwrgate_toggle |= (id << PMC_PWRGATE_TOGGLE_PARTID_SHIFT);
pwrgate_toggle |= PMC_PWRGATE_TOGGLE_START;
write32(pwrgate_toggle, &pmc->pwrgate_toggle);
// Wait for the request to be accepted.
while (read32(&pmc->pwrgate_toggle) & PMC_PWRGATE_TOGGLE_START)
;
printk(BIOS_DEBUG, "Power gate toggle request accepted.\n");
// Wait for the partition to be powered.
while (!partition_powered(id))
;
}
printk(BIOS_INFO, "Ungated power partition %d.\n", id);
}
void power_enable_cpu_rail(void)
{
// Set the power gate timer multiplier to 8 (why 8?).
uint32_t pwrgate_timer_mult = read32(&pmc->pwrgate_timer_mult);
pwrgate_timer_mult |= (0x3 << 0);
/*
* From U-Boot:
* Set CPUPWRGOOD_TIMER - APB clock is 1/2 of SCLK (102MHz),
* set it for 5ms as per SysEng (102MHz/5mS = 510000).
*/
write32(510000, &pmc->cpupwrgood_timer);
power_ungate_partition(POWER_PARTID_CRAIL);
uint32_t cntrl = read32(&pmc->cntrl);
cntrl &= ~PMC_CNTRL_CPUPWRREQ_POLARITY;
cntrl |= PMC_CNTRL_CPUPWRREQ_OE;
write32(cntrl, &pmc->cntrl);
}
void power_ungate_cpu(void)
{
// Ungate power to the non-core parts of the fast cluster.
power_ungate_partition(POWER_PARTID_C0NC);
// Ungate power to CPU0 in the fast cluster.
power_ungate_partition(POWER_PARTID_CE0);
}
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