diff options
Diffstat (limited to 'plat/nvidia/tegra/common/drivers/pmc/pmc.c')
| -rw-r--r-- | plat/nvidia/tegra/common/drivers/pmc/pmc.c | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/plat/nvidia/tegra/common/drivers/pmc/pmc.c b/plat/nvidia/tegra/common/drivers/pmc/pmc.c new file mode 100644 index 00000000..5796ac79 --- /dev/null +++ b/plat/nvidia/tegra/common/drivers/pmc/pmc.c @@ -0,0 +1,122 @@ +/* + * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * Neither the name of ARM nor the names of its contributors may be used + * to endorse or promote products derived from this software without specific + * prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include <arch_helpers.h> +#include <assert.h> +#include <debug.h> +#include <mmio.h> +#include <pmc.h> +#include <tegra_def.h> + +/* Module IDs used during power ungate procedure */ +static const int pmc_cpu_powergate_id[4] = { + 0, /* CPU 0 */ + 9, /* CPU 1 */ + 10, /* CPU 2 */ + 11 /* CPU 3 */ +}; + +/******************************************************************************* + * Power ungate CPU to start the boot process. CPU reset vectors must be + * populated before calling this function. + ******************************************************************************/ +void tegra_pmc_cpu_on(int cpu) +{ + uint32_t val; + + /* + * The PMC deasserts the START bit when it starts the power + * ungate process. Loop till no power toggle is in progress. + */ + do { + val = tegra_pmc_read_32(PMC_PWRGATE_TOGGLE); + } while (val & PMC_TOGGLE_START); + + /* + * Start the power ungate procedure + */ + val = pmc_cpu_powergate_id[cpu] | PMC_TOGGLE_START; + tegra_pmc_write_32(PMC_PWRGATE_TOGGLE, val); + + /* + * The PMC deasserts the START bit when it starts the power + * ungate process. Loop till powergate START bit is asserted. + */ + do { + val = tegra_pmc_read_32(PMC_PWRGATE_TOGGLE); + } while (val & (1 << 8)); + + /* loop till the CPU is power ungated */ + do { + val = tegra_pmc_read_32(PMC_PWRGATE_STATUS); + } while ((val & (1 << pmc_cpu_powergate_id[cpu])) == 0); +} + +/******************************************************************************* + * Setup CPU vectors for resume from deep sleep + ******************************************************************************/ +void tegra_pmc_cpu_setup(uint64_t reset_addr) +{ + uint32_t val; + + tegra_pmc_write_32(PMC_SECURE_SCRATCH34, (reset_addr & 0xFFFFFFFF) | 1); + val = reset_addr >> 32; + tegra_pmc_write_32(PMC_SECURE_SCRATCH35, val & 0x7FF); +} + +/******************************************************************************* + * Lock CPU vectors to restrict further writes + ******************************************************************************/ +void tegra_pmc_lock_cpu_vectors(void) +{ + uint32_t val; + + /* lock PMC_SECURE_SCRATCH34/35 */ + val = tegra_pmc_read_32(PMC_SECURE_DISABLE3); + val |= (PMC_SECURE_DISABLE3_WRITE34_ON | + PMC_SECURE_DISABLE3_WRITE35_ON); + tegra_pmc_write_32(PMC_SECURE_DISABLE3, val); +} + +/******************************************************************************* + * Restart the system + ******************************************************************************/ +__dead2 void tegra_pmc_system_reset(void) +{ + uint32_t reg; + + reg = tegra_pmc_read_32(PMC_CONFIG); + reg |= 0x10; /* restart */ + tegra_pmc_write_32(PMC_CONFIG, reg); + wfi(); + + ERROR("Tegra System Reset: operation not handled.\n"); + panic(); +} |