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 #define SMC_PMCTRL              0x10
  13 #define BP_PMCTRL_PSTOPO        16
  14 #define PSTOPO_PSTOP3           0x3
  15
  16 void __init imx7ulp_pm_init(void)
  17 {
  18         struct device_node *np;
  19         void __iomem *smc1_base;
  20
  21         np = of_find_compatible_node(NULL, NULL, "fsl,imx7ulp-smc1");
  22         smc1_base = of_iomap(np, 0);
  23         WARN_ON(!smc1_base);
  24
  25         /* Partial Stop mode 3 with system/bus clock enabled */
  26         writel_relaxed(PSTOPO_PSTOP3 << BP_PMCTRL_PSTOPO,
  27                        smc1_base + SMC_PMCTRL);
  28         iounmap(smc1_base);
  29 }