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 <dt-bindings/power/meson-s4-power.h>
  15 #include <linux/arm-smccc.h>
  16 #include <linux/firmware/meson/meson_sm.h>
  17 #include <linux/module.h>
  18
  19 #define PWRC_ON         1
  20 #define PWRC_OFF        0
  21
  22 struct meson_secure_pwrc_domain {
  23         struct generic_pm_domain base;
  24         unsigned int index;
  25         struct meson_secure_pwrc *pwrc;
  26 };
  27
  28 struct meson_secure_pwrc {
  29         struct meson_secure_pwrc_domain *domains;
  30         struct genpd_onecell_data xlate;
  31         struct meson_sm_firmware *fw;
  32 };
  33
  34 struct meson_secure_pwrc_domain_desc {
  35         unsigned int index;
  36         unsigned int flags;
  37         char *name;
  38         bool (*is_off)(struct meson_secure_pwrc_domain *pwrc_domain);
  39 };
  40
  41 struct meson_secure_pwrc_domain_data {
  42         unsigned int count;
  43         struct meson_secure_pwrc_domain_desc *domains;
  44 };
  45
  46 static bool pwrc_secure_is_off(struct meson_secure_pwrc_domain *pwrc_domain)
  47 {
  48         int is_off = 1;
  49
  50         if (meson_sm_call(pwrc_domain->pwrc->fw, SM_A1_PWRC_GET, &is_off,
  51                           pwrc_domain->index, 0, 0, 0, 0) < 0)
  52                 pr_err("failed to get power domain status\n");
  53
  54         return is_off;
  55 }
  56
  57 static int meson_secure_pwrc_off(struct generic_pm_domain *domain)
  58 {
  59         int ret = 0;
  60         struct meson_secure_pwrc_domain *pwrc_domain =
  61                 container_of(domain, struct meson_secure_pwrc_domain, base);
  62
  63         if (meson_sm_call(pwrc_domain->pwrc->fw, SM_A1_PWRC_SET, NULL,
  64                           pwrc_domain->index, PWRC_OFF, 0, 0, 0) < 0) {
  65                 pr_err("failed to set power domain off\n");
  66                 ret = -EINVAL;
  67         }
  68
  69         return ret;
  70 }
  71
  72 static int meson_secure_pwrc_on(struct generic_pm_domain *domain)
  73 {
  74         int ret = 0;
  75         struct meson_secure_pwrc_domain *pwrc_domain =
  76                 container_of(domain, struct meson_secure_pwrc_domain, base);
  77
  78         if (meson_sm_call(pwrc_domain->pwrc->fw, SM_A1_PWRC_SET, NULL,
  79                           pwrc_domain->index, PWRC_ON, 0, 0, 0) < 0) {
  80                 pr_err("failed to set power domain on\n");
  81                 ret = -EINVAL;
  82         }
  83
  84         return ret;
  85 }
  86
  87 #define SEC_PD(__name, __flag)                  \
  88 [PWRC_##__name##_ID] =                          \
  89 {                                               \
  90         .name = #__name,                        \
  91         .index = PWRC_##__name##_ID,            \
  92         .is_off = pwrc_secure_is_off,   \
  93         .flags = __flag,                        \
  94 }
  95
  96 static struct meson_secure_pwrc_domain_desc a1_pwrc_domains[] = {
  97         SEC_PD(DSPA,    0),
  98         SEC_PD(DSPB,    0),
  99         /* UART should keep working in ATF after suspend and before resume */
 100         SEC_PD(UART,    GENPD_FLAG_ALWAYS_ON),
 101         /* DMC is for DDR PHY ana/dig and DMC, and should be always on */
 102         SEC_PD(DMC,     GENPD_FLAG_ALWAYS_ON),
 103         SEC_PD(I2C,     0),
 104         SEC_PD(PSRAM,   0),
 105         SEC_PD(ACODEC,  0),
 106         SEC_PD(AUDIO,   0),
 107         SEC_PD(OTP,     0),
 108         SEC_PD(DMA,     0),
 109         SEC_PD(SD_EMMC, 0),
 110         SEC_PD(RAMA,    0),
 111         /* SRAMB is used as ATF runtime memory, and should be always on */
 112         SEC_PD(RAMB,    GENPD_FLAG_ALWAYS_ON),
 113         SEC_PD(IR,      0),
 114         SEC_PD(SPICC,   0),
 115         SEC_PD(SPIFC,   0),
 116         SEC_PD(USB,     0),
 117         /* NIC is for the Arm NIC-400 interconnect, and should be always on */
 118         SEC_PD(NIC,     GENPD_FLAG_ALWAYS_ON),
 119         SEC_PD(PDMIN,   0),
 120         SEC_PD(RSA,     0),
 121 };
 122
 123 static struct meson_secure_pwrc_domain_desc s4_pwrc_domains[] = {
 124         SEC_PD(S4_DOS_HEVC,     0),
 125         SEC_PD(S4_DOS_VDEC,     0),
 126         SEC_PD(S4_VPU_HDMI,     0),
 127         SEC_PD(S4_USB_COMB,     0),
 128         SEC_PD(S4_GE2D,         0),
 129         /* ETH is for ethernet online wakeup, and should be always on */
 130         SEC_PD(S4_ETH,          GENPD_FLAG_ALWAYS_ON),
 131         SEC_PD(S4_DEMOD,        0),
 132         SEC_PD(S4_AUDIO,        0),
 133 };
 134
 135 static int meson_secure_pwrc_probe(struct platform_device *pdev)
 136 {
 137         int i;
 138         struct device_node *sm_np;
 139         struct meson_secure_pwrc *pwrc;
 140         const struct meson_secure_pwrc_domain_data *match;
 141
 142         match = of_device_get_match_data(&pdev->dev);
 143         if (!match) {
 144                 dev_err(&pdev->dev, "failed to get match data\n");
 145                 return -ENODEV;
 146         }
 147
 148         sm_np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gxbb-sm");
 149         if (!sm_np) {
 150                 dev_err(&pdev->dev, "no secure-monitor node\n");
 151                 return -ENODEV;
 152         }
 153
 154         pwrc = devm_kzalloc(&pdev->dev, sizeof(*pwrc), GFP_KERNEL);
 155         if (!pwrc)
 156                 return -ENOMEM;
 157
 158         pwrc->fw = meson_sm_get(sm_np);
 159         of_node_put(sm_np);
 160         if (!pwrc->fw)
 161                 return -EPROBE_DEFER;
 162
 163         pwrc->xlate.domains = devm_kcalloc(&pdev->dev, match->count,
 164                                            sizeof(*pwrc->xlate.domains),
 165                                            GFP_KERNEL);
 166         if (!pwrc->xlate.domains)
 167                 return -ENOMEM;
 168
 169         pwrc->domains = devm_kcalloc(&pdev->dev, match->count,
 170                                      sizeof(*pwrc->domains), GFP_KERNEL);
 171         if (!pwrc->domains)
 172                 return -ENOMEM;
 173
 174         pwrc->xlate.num_domains = match->count;
 175         platform_set_drvdata(pdev, pwrc);
 176
 177         for (i = 0 ; i < match->count ; ++i) {
 178                 struct meson_secure_pwrc_domain *dom = &pwrc->domains[i];
 179
 180                 if (!match->domains[i].index)
 181                         continue;
 182
 183                 dom->pwrc = pwrc;
 184                 dom->index = match->domains[i].index;
 185                 dom->base.name = match->domains[i].name;
 186                 dom->base.flags = match->domains[i].flags;
 187                 dom->base.power_on = meson_secure_pwrc_on;
 188                 dom->base.power_off = meson_secure_pwrc_off;
 189
 190                 pm_genpd_init(&dom->base, NULL, match->domains[i].is_off(dom));
 191
 192                 pwrc->xlate.domains[i] = &dom->base;
 193         }
 194
 195         return of_genpd_add_provider_onecell(pdev->dev.of_node, &pwrc->xlate);
 196 }
 197
 198 static struct meson_secure_pwrc_domain_data meson_secure_a1_pwrc_data = {
 199         .domains = a1_pwrc_domains,
 200         .count = ARRAY_SIZE(a1_pwrc_domains),
 201 };
 202
 203 static struct meson_secure_pwrc_domain_data meson_secure_s4_pwrc_data = {
 204         .domains = s4_pwrc_domains,
 205         .count = ARRAY_SIZE(s4_pwrc_domains),
 206 };
 207
 208 static const struct of_device_id meson_secure_pwrc_match_table[] = {
 209         {
 210                 .compatible = "amlogic,meson-a1-pwrc",
 211                 .data = &meson_secure_a1_pwrc_data,
 212         },
 213         {
 214                 .compatible = "amlogic,meson-s4-pwrc",
 215                 .data = &meson_secure_s4_pwrc_data,
 216         },
 217         { /* sentinel */ }
 218 };
 219 MODULE_DEVICE_TABLE(of, meson_secure_pwrc_match_table);
 220
 221 static struct platform_driver meson_secure_pwrc_driver = {
 222         .probe = meson_secure_pwrc_probe,
 223         .driver = {
 224                 .name           = "meson_secure_pwrc",
 225                 .of_match_table = meson_secure_pwrc_match_table,
 226         },
 227 };
 228 module_platform_driver(meson_secure_pwrc_driver);
 229 MODULE_LICENSE("Dual MIT/GPL");