drivers/soc/actions/owl-sps.c

   1 /*
   2  * Actions Semi Owl Smart Power System (SPS)
   3  *
   4  * Copyright 2012 Actions Semi Inc.
   5  * Author: Actions Semi, Inc.
   6  *
   7  * Copyright (c) 2017 Andreas Färber
   8  *
   9  * This program is free software; you can redistribute  it and/or modify it
  10  * under  the terms of  the GNU General  Public License as published by the
  11  * Free Software Foundation;  either version 2 of the  License, or (at your
  12  * option) any later version.
  13  */
  14
  15 #include <linux/of_address.h>
  16 #include <linux/of_platform.h>
  17 #include <linux/pm_domain.h>
  18 #include <linux/soc/actions/owl-sps.h>
  19 #include <dt-bindings/power/owl-s500-powergate.h>
  20
  21 struct owl_sps_domain_info {
  22         const char *name;
  23         int pwr_bit;
  24         int ack_bit;
  25         unsigned int genpd_flags;
  26 };
  27
  28 struct owl_sps_info {
  29         unsigned num_domains;
  30         const struct owl_sps_domain_info *domains;
  31 };
  32
  33 struct owl_sps {
  34         struct device *dev;
  35         const struct owl_sps_info *info;
  36         void __iomem *base;
  37         struct genpd_onecell_data genpd_data;
  38         struct generic_pm_domain *domains[];
  39 };
  40
  41 #define to_owl_pd(gpd) container_of(gpd, struct owl_sps_domain, genpd)
  42
  43 struct owl_sps_domain {
  44         struct generic_pm_domain genpd;
  45         const struct owl_sps_domain_info *info;
  46         struct owl_sps *sps;
  47 };
  48
  49 static int owl_sps_set_power(struct owl_sps_domain *pd, bool enable)
  50 {
  51         u32 pwr_mask, ack_mask;
  52
  53         ack_mask = BIT(pd->info->ack_bit);
  54         pwr_mask = BIT(pd->info->pwr_bit);
  55
  56         return owl_sps_set_pg(pd->sps->base, pwr_mask, ack_mask, enable);
  57 }
  58
  59 static int owl_sps_power_on(struct generic_pm_domain *domain)
  60 {
  61         struct owl_sps_domain *pd = to_owl_pd(domain);
  62
  63         dev_dbg(pd->sps->dev, "%s power on", pd->info->name);
  64
  65         return owl_sps_set_power(pd, true);
  66 }
  67
  68 static int owl_sps_power_off(struct generic_pm_domain *domain)
  69 {
  70         struct owl_sps_domain *pd = to_owl_pd(domain);
  71
  72         dev_dbg(pd->sps->dev, "%s power off", pd->info->name);
  73
  74         return owl_sps_set_power(pd, false);
  75 }
  76
  77 static int owl_sps_init_domain(struct owl_sps *sps, int index)
  78 {
  79         struct owl_sps_domain *pd;
  80
  81         pd = devm_kzalloc(sps->dev, sizeof(*pd), GFP_KERNEL);
  82         if (!pd)
  83                 return -ENOMEM;
  84
  85         pd->info = &sps->info->domains[index];
  86         pd->sps = sps;
  87
  88         pd->genpd.name = pd->info->name;
  89         pd->genpd.power_on = owl_sps_power_on;
  90         pd->genpd.power_off = owl_sps_power_off;
  91         pd->genpd.flags = pd->info->genpd_flags;
  92         pm_genpd_init(&pd->genpd, NULL, false);
  93
  94         sps->genpd_data.domains[index] = &pd->genpd;
  95
  96         return 0;
  97 }
  98
  99 static int owl_sps_probe(struct platform_device *pdev)
 100 {
 101         const struct of_device_id *match;
 102         const struct owl_sps_info *sps_info;
 103         struct owl_sps *sps;
 104         int i, ret;
 105
 106         if (!pdev->dev.of_node) {
 107                 dev_err(&pdev->dev, "no device node\n");
 108                 return -ENODEV;
 109         }
 110
 111         match = of_match_device(pdev->dev.driver->of_match_table, &pdev->dev);
 112         if (!match || !match->data) {
 113                 dev_err(&pdev->dev, "unknown compatible or missing data\n");
 114                 return -EINVAL;
 115         }
 116
 117         sps_info = match->data;
 118
 119         sps = devm_kzalloc(&pdev->dev, sizeof(*sps) +
 120                            sps_info->num_domains * sizeof(sps->domains[0]),
 121                            GFP_KERNEL);
 122         if (!sps)
 123                 return -ENOMEM;
 124
 125         sps->base = of_io_request_and_map(pdev->dev.of_node, 0, "owl-sps");
 126         if (IS_ERR(sps->base)) {
 127                 dev_err(&pdev->dev, "failed to map sps registers\n");
 128                 return PTR_ERR(sps->base);
 129         }
 130
 131         sps->dev = &pdev->dev;
 132         sps->info = sps_info;
 133         sps->genpd_data.domains = sps->domains;
 134         sps->genpd_data.num_domains = sps_info->num_domains;
 135
 136         for (i = 0; i < sps_info->num_domains; i++) {
 137                 ret = owl_sps_init_domain(sps, i);
 138                 if (ret)
 139                         return ret;
 140         }
 141
 142         ret = of_genpd_add_provider_onecell(pdev->dev.of_node, &sps->genpd_data);
 143         if (ret) {
 144                 dev_err(&pdev->dev, "failed to add provider (%d)", ret);
 145                 return ret;
 146         }
 147
 148         return 0;
 149 }
 150
 151 static const struct owl_sps_domain_info s500_sps_domains[] = {
 152         [S500_PD_VDE] = {
 153                 .name = "VDE",
 154                 .pwr_bit = 0,
 155                 .ack_bit = 16,
 156         },
 157         [S500_PD_VCE_SI] = {
 158                 .name = "VCE_SI",
 159                 .pwr_bit = 1,
 160                 .ack_bit = 17,
 161         },
 162         [S500_PD_USB2_1] = {
 163                 .name = "USB2_1",
 164                 .pwr_bit = 2,
 165                 .ack_bit = 18,
 166         },
 167         [S500_PD_CPU2] = {
 168                 .name = "CPU2",
 169                 .pwr_bit = 5,
 170                 .ack_bit = 21,
 171                 .genpd_flags = GENPD_FLAG_ALWAYS_ON,
 172         },
 173         [S500_PD_CPU3] = {
 174                 .name = "CPU3",
 175                 .pwr_bit = 6,
 176                 .ack_bit = 22,
 177                 .genpd_flags = GENPD_FLAG_ALWAYS_ON,
 178         },
 179         [S500_PD_DMA] = {
 180                 .name = "DMA",
 181                 .pwr_bit = 8,
 182                 .ack_bit = 12,
 183         },
 184         [S500_PD_DS] = {
 185                 .name = "DS",
 186                 .pwr_bit = 9,
 187                 .ack_bit = 13,
 188         },
 189         [S500_PD_USB3] = {
 190                 .name = "USB3",
 191                 .pwr_bit = 10,
 192                 .ack_bit = 14,
 193         },
 194         [S500_PD_USB2_0] = {
 195                 .name = "USB2_0",
 196                 .pwr_bit = 11,
 197                 .ack_bit = 15,
 198         },
 199 };
 200
 201 static const struct owl_sps_info s500_sps_info = {
 202         .num_domains = ARRAY_SIZE(s500_sps_domains),
 203         .domains = s500_sps_domains,
 204 };
 205
 206 static const struct of_device_id owl_sps_of_matches[] = {
 207         { .compatible = "actions,s500-sps", .data = &s500_sps_info },
 208         { }
 209 };
 210
 211 static struct platform_driver owl_sps_platform_driver = {
 212         .probe = owl_sps_probe,
 213         .driver = {
 214                 .name = "owl-sps",
 215                 .of_match_table = owl_sps_of_matches,
 216                 .suppress_bind_attrs = true,
 217         },
 218 };
 219
 220 static int __init owl_sps_init(void)
 221 {
 222         return platform_driver_register(&owl_sps_platform_driver);
 223 }
 224 postcore_initcall(owl_sps_init);