arch/arm/mach-imx/pm-imx7ulp.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2016 Freescale Semiconductor, Inc.
   4  * Copyright 2017-2018 NXP
   5  *   Author: Dong Aisheng <aisheng.dong@nxp.com>
   6  */
   7
   8 #include <linux/io.h>
   9 #include <linux/of.h>
  10 #include <linux/of_address.h>
  11
  12 #include "common.h"
  13
  14 #define SMC_PMCTRL              0x10
  15 #define BP_PMCTRL_PSTOPO        16
  16 #define PSTOPO_PSTOP3           0x3
  17 #define PSTOPO_PSTOP2           0x2
  18 #define PSTOPO_PSTOP1           0x1
  19 #define BP_PMCTRL_RUNM          8
  20 #define RUNM_RUN                0
  21 #define BP_PMCTRL_STOPM         0
  22 #define STOPM_STOP              0
  23
  24 #define BM_PMCTRL_PSTOPO        (3 << BP_PMCTRL_PSTOPO)
  25 #define BM_PMCTRL_RUNM          (3 << BP_PMCTRL_RUNM)
  26 #define BM_PMCTRL_STOPM         (7 << BP_PMCTRL_STOPM)
  27
  28 static void __iomem *smc1_base;
  29
  30 int imx7ulp_set_lpm(enum ulp_cpu_pwr_mode mode)
  31 {
  32         u32 val = readl_relaxed(smc1_base + SMC_PMCTRL);
  33
  34         /* clear all */
  35         val &= ~(BM_PMCTRL_RUNM | BM_PMCTRL_STOPM | BM_PMCTRL_PSTOPO);
  36
  37         switch (mode) {
  38         case ULP_PM_RUN:
  39                 /* system/bus clock enabled */
  40                 val |= PSTOPO_PSTOP3 << BP_PMCTRL_PSTOPO;
  41                 break;
  42         case ULP_PM_WAIT:
  43                 /* system clock disabled, bus clock enabled */
  44                 val |= PSTOPO_PSTOP2 << BP_PMCTRL_PSTOPO;
  45                 break;
  46         case ULP_PM_STOP:
  47                 /* system/bus clock disabled */
  48                 val |= PSTOPO_PSTOP1 << BP_PMCTRL_PSTOPO;
  49                 break;
  50         default:
  51                 return -EINVAL;
  52         }
  53
  54         writel_relaxed(val, smc1_base + SMC_PMCTRL);
  55
  56         return 0;
  57 }
  58
  59 void __init imx7ulp_pm_init(void)
  60 {
  61         struct device_node *np;
  62
  63         np = of_find_compatible_node(NULL, NULL, "fsl,imx7ulp-smc1");
  64         smc1_base = of_iomap(np, 0);
  65         WARN_ON(!smc1_base);
  66
  67         imx7ulp_set_lpm(ULP_PM_RUN);
  68 }