mirror of
https://github.com/torvalds/linux.git
synced 2024-12-29 14:21:47 +00:00
6d45a4028c
This patch adds cpuidle support for i.MX7ULP, 3 cpuidle states supported as below: 1. WFI, just ARM wfi; 2. WAIT mode, mapped to SoC's partial stop mode #3; 3. STOP mode, mapped to SoC's partial stop mode #1. In WAIT mode, system clock and bus clock will be enabled; In STOP mode, system clock and bus clock will be disabled. Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Signed-off-by: Shawn Guo <shawnguo@kernel.org>
69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
// 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);
|
|
WARN_ON(!smc1_base);
|
|
|
|
imx7ulp_set_lpm(ULP_PM_RUN);
|
|
}
|