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/io.h>
  11 #include <asm/arch/power-domain.h>
  12 #include <asm/mach-imx/sys_proto.h>
  13 #include <dm/device-internal.h>
  14 #include <dm/device.h>
  15 #include <imx_sip.h>
  16 #include <linux/arm-smccc.h>
  17
  18 DECLARE_GLOBAL_DATA_PTR;
  19
  20 static int imx8m_power_domain_request(struct power_domain *power_domain)
  21 {
  22         return 0;
  23 }
  24
  25 static int imx8m_power_domain_free(struct power_domain *power_domain)
  26 {
  27         return 0;
  28 }
  29
  30 static int imx8m_power_domain_on(struct power_domain *power_domain)
  31 {
  32         struct udevice *dev = power_domain->dev;
  33         struct imx8m_power_domain_platdata *pdata;
  34
  35         pdata = dev_get_plat(dev);
  36
  37         if (pdata->resource_id < 0)
  38                 return -EINVAL;
  39
  40         if (pdata->has_pd)
  41                 power_domain_on(&pdata->pd);
  42
  43         arm_smccc_smc(IMX_SIP_GPC, IMX_SIP_GPC_PM_DOMAIN,
  44                       pdata->resource_id, 1, 0, 0, 0, 0, NULL);
  45
  46         return 0;
  47 }
  48
  49 static int imx8m_power_domain_off(struct power_domain *power_domain)
  50 {
  51         struct udevice *dev = power_domain->dev;
  52         struct imx8m_power_domain_platdata *pdata;
  53         pdata = dev_get_plat(dev);
  54
  55         if (pdata->resource_id < 0)
  56                 return -EINVAL;
  57
  58         arm_smccc_smc(IMX_SIP_GPC, IMX_SIP_GPC_PM_DOMAIN,
  59                       pdata->resource_id, 0, 0, 0, 0, 0, NULL);
  60
  61         if (pdata->has_pd)
  62                 power_domain_off(&pdata->pd);
  63
  64         return 0;
  65 }
  66
  67 static int imx8m_power_domain_of_xlate(struct power_domain *power_domain,
  68                                       struct ofnode_phandle_args *args)
  69 {
  70         return 0;
  71 }
  72
  73 static int imx8m_power_domain_bind(struct udevice *dev)
  74 {
  75         int offset;
  76         const char *name;
  77         int ret = 0;
  78
  79         offset = dev_of_offset(dev);
  80         for (offset = fdt_first_subnode(gd->fdt_blob, offset); offset > 0;
  81              offset = fdt_next_subnode(gd->fdt_blob, offset)) {
  82                 /* Bind the subnode to this driver */
  83                 name = fdt_get_name(gd->fdt_blob, offset, NULL);
  84
  85                 ret = device_bind_with_driver_data(dev, dev->driver, name,
  86                                                    dev->driver_data,
  87                                                    offset_to_ofnode(offset),
  88                                                    NULL);
  89
  90                 if (ret == -ENODEV)
  91                         printf("Driver '%s' refuses to bind\n",
  92                                dev->driver->name);
  93
  94                 if (ret)
  95                         printf("Error binding driver '%s': %d\n",
  96                                dev->driver->name, ret);
  97         }
  98
  99         return 0;
 100 }
 101
 102 static int imx8m_power_domain_probe(struct udevice *dev)
 103 {
 104         return 0;
 105 }
 106
 107 static int imx8m_power_domain_ofdata_to_platdata(struct udevice *dev)
 108 {
 109         struct imx8m_power_domain_platdata *pdata = dev_get_plat(dev);
 110
 111         pdata->resource_id = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
 112                                             "reg", -1);
 113
 114         if (!power_domain_get(dev, &pdata->pd))
 115                 pdata->has_pd = 1;
 116
 117         return 0;
 118 }
 119
 120 static const struct udevice_id imx8m_power_domain_ids[] = {
 121         { .compatible = "fsl,imx8mq-gpc" },
 122         { }
 123 };
 124
 125 struct power_domain_ops imx8m_power_domain_ops = {
 126         .request = imx8m_power_domain_request,
 127         .rfree = imx8m_power_domain_free,
 128         .on = imx8m_power_domain_on,
 129         .off = imx8m_power_domain_off,
 130         .of_xlate = imx8m_power_domain_of_xlate,
 131 };
 132
 133 U_BOOT_DRIVER(imx8m_power_domain) = {
 134         .name = "imx8m_power_domain",
 135         .id = UCLASS_POWER_DOMAIN,
 136         .of_match = imx8m_power_domain_ids,
 137         .bind = imx8m_power_domain_bind,
 138         .probe = imx8m_power_domain_probe,
 139         .ofdata_to_platdata = imx8m_power_domain_ofdata_to_platdata,
 140         .plat_auto      = sizeof(struct imx8m_power_domain_platdata),
 141         .ops = &imx8m_power_domain_ops,
 142 };