| /* Copyright (c) 2016-2017, The Linux Foundation. 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 version 2 and |
| * only version 2 as published by the Free Software Foundation. |
| * |
| * 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. |
| * |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/platform_device.h> |
| |
| #include <soc/qcom/rpmh.h> |
| #include <soc/qcom/system_pm.h> |
| |
| #define ARCH_TIMER_HZ (19200000UL) |
| #define PDC_TIME_VALID_SHIFT 31 |
| #define PDC_TIME_UPPER_MASK 0xFFFFFF |
| |
| static struct rpmh_client *rpmh_client; |
| |
| static int setup_wakeup(uint64_t sleep_val) |
| { |
| struct tcs_cmd cmd[2] = { { 0 } }; |
| |
| cmd[0].data = (sleep_val >> 32) & PDC_TIME_UPPER_MASK; |
| cmd[0].data |= 1 << PDC_TIME_VALID_SHIFT; |
| cmd[1].data = sleep_val & 0xFFFFFFFF; |
| |
| return rpmh_write_control(rpmh_client, cmd, ARRAY_SIZE(cmd)); |
| } |
| |
| /** |
| * system_sleep_allowed() - Returns if its okay to enter system low power modes |
| */ |
| bool system_sleep_allowed(void) |
| { |
| return (rpmh_ctrlr_idle(rpmh_client) == 0); |
| } |
| EXPORT_SYMBOL(system_sleep_allowed); |
| |
| /** |
| * system_sleep_enter() - Activties done when entering system low power modes |
| * |
| * @sleep_val: The sleep duration in us. |
| * |
| * Returns 0 for success or error values from writing the timer value in the |
| * hardware block. |
| */ |
| int system_sleep_enter(uint64_t sleep_val) |
| { |
| int ret; |
| |
| if (IS_ERR_OR_NULL(rpmh_client)) |
| return -EFAULT; |
| |
| ret = rpmh_flush(rpmh_client); |
| if (ret) |
| return ret; |
| |
| /* |
| * Set up the wake up value offset from the current time. |
| * Convert us to ns to allow div by 19.2 Mhz tick timer. |
| */ |
| if (sleep_val) { |
| sleep_val *= NSEC_PER_USEC; |
| do_div(sleep_val, NSEC_PER_SEC/ARCH_TIMER_HZ); |
| sleep_val += arch_counter_get_cntvct(); |
| } else { |
| sleep_val = ~0ULL; |
| } |
| |
| return setup_wakeup(sleep_val); |
| } |
| EXPORT_SYMBOL(system_sleep_enter); |
| |
| /** |
| * system_sleep_exit() - Activities done when exiting system low power modes |
| */ |
| void system_sleep_exit(void) |
| { |
| } |
| EXPORT_SYMBOL(system_sleep_exit); |
| |
| static int sys_pm_probe(struct platform_device *pdev) |
| { |
| rpmh_client = rpmh_get_byindex(pdev, 0); |
| if (IS_ERR_OR_NULL(rpmh_client)) |
| return PTR_ERR(rpmh_client); |
| |
| return 0; |
| } |
| |
| static const struct of_device_id sys_pm_drv_match[] = { |
| { .compatible = "qcom,system-pm", }, |
| { } |
| }; |
| |
| static struct platform_driver sys_pm_driver = { |
| .probe = sys_pm_probe, |
| .driver = { |
| .name = KBUILD_MODNAME, |
| .of_match_table = sys_pm_drv_match, |
| }, |
| }; |
| builtin_platform_driver(sys_pm_driver); |