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/*
* This file is part of the coreboot project.
*
* Copyright (c) 2014, NVIDIA CORPORATION.
* 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 <delay.h>
#include <soc/addressmap.h>
#include <soc/clk_rst.h>
#include <soc/clock.h>
#include <soc/nvidia/tegra/i2c.h>
#include <soc/padconfig.h>
#include <soc/power.h>
#define I2C6_BUS 5
#define I2C6_PADCTL 0xC001
#define DPAUX_HYBRID_PADCTL 0x545C0124
static struct tegra_pmc_regs * const pmc = (void *)TEGRA_PMC_BASE;
static int partition_clamp_on(int id)
{
return read32(&pmc->clamp_status) & (1 << id);
}
static void remove_clamps(int id)
{
if (!partition_clamp_on(id))
return;
/* Remove clamp */
write32(&pmc->remove_clamping_cmd, (1 << id));
/* Wait for clamp off */
while (partition_clamp_on(id))
;
}
static void enable_sor_periph_clocks(void)
{
clock_enable(CLK_L_HOST1X, 0, 0, 0, 0, CLK_X_DPAUX);
/* Give clocks time to stabilize. */
udelay(IO_STABILIZATION_DELAY);
}
static void disable_sor_periph_clocks(void)
{
clock_disable(CLK_L_HOST1X, 0, 0, 0, 0, CLK_X_DPAUX);
/* Give clocks time to stabilize. */
udelay(IO_STABILIZATION_DELAY);
}
static void unreset_sor_periphs(void)
{
clock_clr_reset(CLK_L_HOST1X, 0, 0, 0, 0, CLK_X_DPAUX);
}
void soc_configure_i2c6pad(void)
{
/*
* I2C6 on Tegra124/132 requires some special init.
* The SOR block must be unpowergated, and a couple of
* display-based peripherals must be clocked and taken
* out of reset so that a DPAUX register can be
* configured to enable the I2C6 mux routing.
* Afterwards, we can disable clocks to the display blocks
* and put Host1X back in reset. DPAUX must remain out of
* reset and the SOR partition must remained unpowergated.
*/
soc_configure_host1x();
/* Now we can write the I2C6 mux in DPAUX */
write32((void *)DPAUX_HYBRID_PADCTL, I2C6_PADCTL);
/*
* Delay before turning off Host1X/DPAUX clocks.
* This delay is needed to keep the sequence from
* hanging the system.
*/
udelay(CLOCK_PLL_STABLE_DELAY_US);
/* Stop Host1X/DPAUX clocks and reset Host1X */
disable_sor_periph_clocks();
clock_set_reset_l(CLK_L_HOST1X);
}
void soc_configure_host1x(void)
{
power_ungate_partition(POWER_PARTID_SOR);
/* Host1X needs a valid clock source so DPAUX can be accessed. */
clock_configure_source(host1x, PLLP, 204000);
enable_sor_periph_clocks();
remove_clamps(POWER_PARTID_SOR);
unreset_sor_periphs();
}
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