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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2016 Freescale Semiconductor, Inc.
* Copyright 2017-2018 NXP
* Author: Dong Aisheng <aisheng.dong@nxp.com>
*/
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include "common.h"
#define SMC_PMCTRL 0x10
#define BP_PMCTRL_PSTOPO 16
#define PSTOPO_PSTOP3 0x3
#define PSTOPO_PSTOP2 0x2
#define PSTOPO_PSTOP1 0x1
#define BP_PMCTRL_RUNM 8
#define RUNM_RUN 0
#define BP_PMCTRL_STOPM 0
#define STOPM_STOP 0
#define BM_PMCTRL_PSTOPO (3 << BP_PMCTRL_PSTOPO)
#define BM_PMCTRL_RUNM (3 << BP_PMCTRL_RUNM)
#define BM_PMCTRL_STOPM (7 << BP_PMCTRL_STOPM)
static void __iomem *smc1_base;
int imx7ulp_set_lpm(enum ulp_cpu_pwr_mode mode)
{
u32 val = readl_relaxed(smc1_base + SMC_PMCTRL);
/* clear all */
val &= ~(BM_PMCTRL_RUNM | BM_PMCTRL_STOPM | BM_PMCTRL_PSTOPO);
switch (mode) {
case ULP_PM_RUN:
/* system/bus clock enabled */
val |= PSTOPO_PSTOP3 << BP_PMCTRL_PSTOPO;
break;
case ULP_PM_WAIT:
/* system clock disabled, bus clock enabled */
val |= PSTOPO_PSTOP2 << BP_PMCTRL_PSTOPO;
break;
case ULP_PM_STOP:
/* system/bus clock disabled */
val |= PSTOPO_PSTOP1 << BP_PMCTRL_PSTOPO;
break;
default:
return -EINVAL;
}
writel_relaxed(val, smc1_base + SMC_PMCTRL);
return 0;
}
void __init imx7ulp_pm_init(void)
{
struct device_node *np;
np = of_find_compatible_node(NULL, NULL, "fsl,imx7ulp-smc1");
smc1_base = of_iomap(np, 0);
of_node_put(np);
WARN_ON(!smc1_base);
imx7ulp_set_lpm(ULP_PM_RUN);
}
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