Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Power Management driver for Marvell Kirkwood SoCs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Copyright (C) 2013 Ezequiel Garcia <ezequiel@free-electrons.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * Copyright (C) 2010 Simon Guinot <sguinot@lacie.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/suspend.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include "kirkwood.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include "kirkwood-pm.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) static void __iomem *ddr_operation_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) static void __iomem *memory_pm_ctrl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) static void kirkwood_low_power(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	u32 mem_pm_ctrl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	mem_pm_ctrl = readl(memory_pm_ctrl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	/* Set peripherals to low-power mode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	writel_relaxed(~0, memory_pm_ctrl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	/* Set DDR in self-refresh */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	writel_relaxed(0x7, ddr_operation_base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	 * Set CPU in wait-for-interrupt state.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	 * This disables the CPU core clocks,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	 * the array clocks, and also the L2 controller.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	cpu_do_idle();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	writel_relaxed(mem_pm_ctrl, memory_pm_ctrl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) static int kirkwood_suspend_enter(suspend_state_t state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	switch (state) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	case PM_SUSPEND_STANDBY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 		kirkwood_low_power();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static int kirkwood_pm_valid_standby(suspend_state_t state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	return state == PM_SUSPEND_STANDBY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) static const struct platform_suspend_ops kirkwood_suspend_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	.enter = kirkwood_suspend_enter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	.valid = kirkwood_pm_valid_standby,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) void __init kirkwood_pm_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	ddr_operation_base = ioremap(DDR_OPERATION_BASE, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	memory_pm_ctrl = ioremap(MEMORY_PM_CTRL_PHYS, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	suspend_set_ops(&kirkwood_suspend_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) }