drivers/power/domain/imx8m-power-domain.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright 2017 NXP
   4  */
   5
   6 #include <common.h>
   7 #include <dm.h>
   8 #include <malloc.h>
   9 #include <power-domain-uclass.h>
  10 #include <asm/global_data.h>
  11 #include <asm/io.h>
  12 #include <asm/arch/power-domain.h>
  13 #include <asm/mach-imx/sys_proto.h>
  14 #include <dm/device-internal.h>
  15 #include <dm/device.h>
  16 #include <imx_sip.h>
  17 #include <linux/arm-smccc.h>
  18
  19 DECLARE_GLOBAL_DATA_PTR;
  20
  21 static int imx8m_power_domain_request(struct power_domain *power_domain)
  22 {
  23         return 0;
  24 }
  25
  26 static int imx8m_power_domain_free(struct power_domain *power_domain)
  27 {
  28         return 0;
  29 }
  30
  31 static int imx8m_power_domain_on(struct power_domain *power_domain)
  32 {
  33         struct udevice *dev = power_domain->dev;
  34         struct imx8m_power_domain_plat *pdata;
  35
  36         pdata = dev_get_plat(dev);
  37
  38         if (pdata->resource_id < 0)
  39                 return -EINVAL;
  40
  41         if (pdata->has_pd)
  42                 power_domain_on(&pdata->pd);
  43
  44         arm_smccc_smc(IMX_SIP_GPC, IMX_SIP_GPC_PM_DOMAIN,
  45                       pdata->resource_id, 1, 0, 0, 0, 0, NULL);
  46
  47         return 0;
  48 }
  49
  50 static int imx8m_power_domain_off(struct power_domain *power_domain)
  51 {
  52         struct udevice *dev = power_domain->dev;
  53         struct imx8m_power_domain_plat *pdata;
  54         pdata = dev_get_plat(dev);
  55
  56         if (pdata->resource_id < 0)
  57                 return -EINVAL;
  58
  59         arm_smccc_smc(IMX_SIP_GPC, IMX_SIP_GPC_PM_DOMAIN,
  60                       pdata->resource_id, 0, 0, 0, 0, 0, NULL);
  61
  62         if (pdata->has_pd)
  63                 power_domain_off(&pdata->pd);
  64
  65         return 0;
  66 }
  67
  68 static int imx8m_power_domain_of_xlate(struct power_domain *power_domain,
  69                                       struct ofnode_phandle_args *args)
  70 {
  71         return 0;
  72 }
  73
  74 static int imx8m_power_domain_bind(struct udevice *dev)
  75 {
  76         int offset;
  77         const char *name;
  78         int ret = 0;
  79
  80         offset = dev_of_offset(dev);
  81         for (offset = fdt_first_subnode(gd->fdt_blob, offset); offset > 0;
  82              offset = fdt_next_subnode(gd->fdt_blob, offset)) {
  83                 /* Bind the subnode to this driver */
  84                 name = fdt_get_name(gd->fdt_blob, offset, NULL);
  85
  86                 ret = device_bind_with_driver_data(dev, dev->driver, name,
  87                                                    dev->driver_data,
  88                                                    offset_to_ofnode(offset),
  89                                                    NULL);
  90
  91                 if (ret == -ENODEV)
  92                         printf("Driver '%s' refuses to bind\n",
  93                                dev->driver->name);
  94
  95                 if (ret)
  96                         printf("Error binding driver '%s': %d\n",
  97                                dev->driver->name, ret);
  98         }
  99
 100         return 0;
 101 }
 102
 103 static int imx8m_power_domain_probe(struct udevice *dev)
 104 {
 105         return 0;
 106 }
 107
 108 static int imx8m_power_domain_of_to_plat(struct udevice *dev)
 109 {
 110         struct imx8m_power_domain_plat *pdata = dev_get_plat(dev);
 111
 112         pdata->resource_id = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
 113                                             "reg", -1);
 114
 115         if (!power_domain_get(dev, &pdata->pd))
 116                 pdata->has_pd = 1;
 117
 118         return 0;
 119 }
 120
 121 static const struct udevice_id imx8m_power_domain_ids[] = {
 122         { .compatible = "fsl,imx8mq-gpc" },
 123         { .compatible = "fsl,imx8mm-gpc" },
 124         { .compatible = "fsl,imx8mn-gpc" },
 125         { }
 126 };
 127
 128 struct power_domain_ops imx8m_power_domain_ops = {
 129         .request = imx8m_power_domain_request,
 130         .rfree = imx8m_power_domain_free,
 131         .on = imx8m_power_domain_on,
 132         .off = imx8m_power_domain_off,
 133         .of_xlate = imx8m_power_domain_of_xlate,
 134 };
 135
 136 U_BOOT_DRIVER(imx8m_power_domain) = {
 137         .name = "imx8m_power_domain",
 138         .id = UCLASS_POWER_DOMAIN,
 139         .of_match = imx8m_power_domain_ids,
 140         .bind = imx8m_power_domain_bind,
 141         .probe = imx8m_power_domain_probe,
 142         .of_to_plat = imx8m_power_domain_of_to_plat,
 143         .plat_auto      = sizeof(struct imx8m_power_domain_plat),
 144         .ops = &imx8m_power_domain_ops,
 145 };