drivers/soc/amlogic/meson-secure-pwrc.c

   1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
   2 /*
   3  * Copyright (c) 2019 Amlogic, Inc.
   4  * Author: Jianxin Pan <jianxin.pan@amlogic.com>
   5  */
   6
   7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   8
   9 #include <linux/io.h>
  10 #include <linux/of_device.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/pm_domain.h>
  13 #include <dt-bindings/power/meson-a1-power.h>
  14 #include <linux/arm-smccc.h>
  15 #include <linux/firmware/meson/meson_sm.h>
  16
  17 #define PWRC_ON         1
  18 #define PWRC_OFF        0
  19
  20 struct meson_secure_pwrc_domain {
  21         struct generic_pm_domain base;
  22         unsigned int index;
  23         struct meson_secure_pwrc *pwrc;
  24 };
  25
  26 struct meson_secure_pwrc {
  27         struct meson_secure_pwrc_domain *domains;
  28         struct genpd_onecell_data xlate;
  29         struct meson_sm_firmware *fw;
  30 };
  31
  32 struct meson_secure_pwrc_domain_desc {
  33         unsigned int index;
  34         unsigned int flags;
  35         char *name;
  36         bool (*is_off)(struct meson_secure_pwrc_domain *pwrc_domain);
  37 };
  38
  39 struct meson_secure_pwrc_domain_data {
  40         unsigned int count;
  41         struct meson_secure_pwrc_domain_desc *domains;
  42 };
  43
  44 static bool pwrc_secure_is_off(struct meson_secure_pwrc_domain *pwrc_domain)
  45 {
  46         int is_off = 1;
  47
  48         if (meson_sm_call(pwrc_domain->pwrc->fw, SM_A1_PWRC_GET, &is_off,
  49                           pwrc_domain->index, 0, 0, 0, 0) < 0)
  50                 pr_err("failed to get power domain status\n");
  51
  52         return is_off;
  53 }
  54
  55 static int meson_secure_pwrc_off(struct generic_pm_domain *domain)
  56 {
  57         int ret = 0;
  58         struct meson_secure_pwrc_domain *pwrc_domain =
  59                 container_of(domain, struct meson_secure_pwrc_domain, base);
  60
  61         if (meson_sm_call(pwrc_domain->pwrc->fw, SM_A1_PWRC_SET, NULL,
  62                           pwrc_domain->index, PWRC_OFF, 0, 0, 0) < 0) {
  63                 pr_err("failed to set power domain off\n");
  64                 ret = -EINVAL;
  65         }
  66
  67         return ret;
  68 }
  69
  70 static int meson_secure_pwrc_on(struct generic_pm_domain *domain)
  71 {
  72         int ret = 0;
  73         struct meson_secure_pwrc_domain *pwrc_domain =
  74                 container_of(domain, struct meson_secure_pwrc_domain, base);
  75
  76         if (meson_sm_call(pwrc_domain->pwrc->fw, SM_A1_PWRC_SET, NULL,
  77                           pwrc_domain->index, PWRC_ON, 0, 0, 0) < 0) {
  78                 pr_err("failed to set power domain on\n");
  79                 ret = -EINVAL;
  80         }
  81
  82         return ret;
  83 }
  84
  85 #define SEC_PD(__name, __flag)                  \
  86 [PWRC_##__name##_ID] =                          \
  87 {                                               \
  88         .name = #__name,                        \
  89         .index = PWRC_##__name##_ID,            \
  90         .is_off = pwrc_secure_is_off,   \
  91         .flags = __flag,                        \
  92 }
  93
  94 static struct meson_secure_pwrc_domain_desc a1_pwrc_domains[] = {
  95         SEC_PD(DSPA,    0),
  96         SEC_PD(DSPB,    0),
  97         /* UART should keep working in ATF after suspend and before resume */
  98         SEC_PD(UART,    GENPD_FLAG_ALWAYS_ON),
  99         /* DMC is for DDR PHY ana/dig and DMC, and should be always on */
 100         SEC_PD(DMC,     GENPD_FLAG_ALWAYS_ON),
 101         SEC_PD(I2C,     0),
 102         SEC_PD(PSRAM,   0),
 103         SEC_PD(ACODEC,  0),
 104         SEC_PD(AUDIO,   0),
 105         SEC_PD(OTP,     0),
 106         SEC_PD(DMA,     0),
 107         SEC_PD(SD_EMMC, 0),
 108         SEC_PD(RAMA,    0),
 109         /* SRAMB is used as ATF runtime memory, and should be always on */
 110         SEC_PD(RAMB,    GENPD_FLAG_ALWAYS_ON),
 111         SEC_PD(IR,      0),
 112         SEC_PD(SPICC,   0),
 113         SEC_PD(SPIFC,   0),
 114         SEC_PD(USB,     0),
 115         /* NIC is for the Arm NIC-400 interconnect, and should be always on */
 116         SEC_PD(NIC,     GENPD_FLAG_ALWAYS_ON),
 117         SEC_PD(PDMIN,   0),
 118         SEC_PD(RSA,     0),
 119 };
 120
 121 static int meson_secure_pwrc_probe(struct platform_device *pdev)
 122 {
 123         int i;
 124         struct device_node *sm_np;
 125         struct meson_secure_pwrc *pwrc;
 126         const struct meson_secure_pwrc_domain_data *match;
 127
 128         match = of_device_get_match_data(&pdev->dev);
 129         if (!match) {
 130                 dev_err(&pdev->dev, "failed to get match data\n");
 131                 return -ENODEV;
 132         }
 133
 134         sm_np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gxbb-sm");
 135         if (!sm_np) {
 136                 dev_err(&pdev->dev, "no secure-monitor node\n");
 137                 return -ENODEV;
 138         }
 139
 140         pwrc = devm_kzalloc(&pdev->dev, sizeof(*pwrc), GFP_KERNEL);
 141         if (!pwrc)
 142                 return -ENOMEM;
 143
 144         pwrc->fw = meson_sm_get(sm_np);
 145         of_node_put(sm_np);
 146         if (!pwrc->fw)
 147                 return -EPROBE_DEFER;
 148
 149         pwrc->xlate.domains = devm_kcalloc(&pdev->dev, match->count,
 150                                            sizeof(*pwrc->xlate.domains),
 151                                            GFP_KERNEL);
 152         if (!pwrc->xlate.domains)
 153                 return -ENOMEM;
 154
 155         pwrc->domains = devm_kcalloc(&pdev->dev, match->count,
 156                                      sizeof(*pwrc->domains), GFP_KERNEL);
 157         if (!pwrc->domains)
 158                 return -ENOMEM;
 159
 160         pwrc->xlate.num_domains = match->count;
 161         platform_set_drvdata(pdev, pwrc);
 162
 163         for (i = 0 ; i < match->count ; ++i) {
 164                 struct meson_secure_pwrc_domain *dom = &pwrc->domains[i];
 165
 166                 if (!match->domains[i].index)
 167                         continue;
 168
 169                 dom->pwrc = pwrc;
 170                 dom->index = match->domains[i].index;
 171                 dom->base.name = match->domains[i].name;
 172                 dom->base.flags = match->domains[i].flags;
 173                 dom->base.power_on = meson_secure_pwrc_on;
 174                 dom->base.power_off = meson_secure_pwrc_off;
 175
 176                 pm_genpd_init(&dom->base, NULL, match->domains[i].is_off(dom));
 177
 178                 pwrc->xlate.domains[i] = &dom->base;
 179         }
 180
 181         return of_genpd_add_provider_onecell(pdev->dev.of_node, &pwrc->xlate);
 182 }
 183
 184 static struct meson_secure_pwrc_domain_data meson_secure_a1_pwrc_data = {
 185         .domains = a1_pwrc_domains,
 186         .count = ARRAY_SIZE(a1_pwrc_domains),
 187 };
 188
 189 static const struct of_device_id meson_secure_pwrc_match_table[] = {
 190         {
 191                 .compatible = "amlogic,meson-a1-pwrc",
 192                 .data = &meson_secure_a1_pwrc_data,
 193         },
 194         { /* sentinel */ }
 195 };
 196
 197 static struct platform_driver meson_secure_pwrc_driver = {
 198         .probe = meson_secure_pwrc_probe,
 199         .driver = {
 200                 .name           = "meson_secure_pwrc",
 201                 .of_match_table = meson_secure_pwrc_match_table,
 202         },
 203 };
 204 builtin_platform_driver(meson_secure_pwrc_driver);