drivers/genpd/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.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/amlogic,c3-pwrc.h>
  15 #include <dt-bindings/power/meson-s4-power.h>
  16 #include <linux/arm-smccc.h>
  17 #include <linux/firmware/meson/meson_sm.h>
  18 #include <linux/module.h>
  19
  20 #define PWRC_ON         1
  21 #define PWRC_OFF        0
  22
  23 struct meson_secure_pwrc_domain {
  24         struct generic_pm_domain base;
  25         unsigned int index;
  26         struct meson_secure_pwrc *pwrc;
  27 };
  28
  29 struct meson_secure_pwrc {
  30         struct meson_secure_pwrc_domain *domains;
  31         struct genpd_onecell_data xlate;
  32         struct meson_sm_firmware *fw;
  33 };
  34
  35 struct meson_secure_pwrc_domain_desc {
  36         unsigned int index;
  37         unsigned int flags;
  38         char *name;
  39         bool (*is_off)(struct meson_secure_pwrc_domain *pwrc_domain);
  40 };
  41
  42 struct meson_secure_pwrc_domain_data {
  43         unsigned int count;
  44         struct meson_secure_pwrc_domain_desc *domains;
  45 };
  46
  47 static bool pwrc_secure_is_off(struct meson_secure_pwrc_domain *pwrc_domain)
  48 {
  49         int is_off = 1;
  50
  51         if (meson_sm_call(pwrc_domain->pwrc->fw, SM_A1_PWRC_GET, &is_off,
  52                           pwrc_domain->index, 0, 0, 0, 0) < 0)
  53                 pr_err("failed to get power domain status\n");
  54
  55         return is_off;
  56 }
  57
  58 static int meson_secure_pwrc_off(struct generic_pm_domain *domain)
  59 {
  60         int ret = 0;
  61         struct meson_secure_pwrc_domain *pwrc_domain =
  62                 container_of(domain, struct meson_secure_pwrc_domain, base);
  63
  64         if (meson_sm_call(pwrc_domain->pwrc->fw, SM_A1_PWRC_SET, NULL,
  65                           pwrc_domain->index, PWRC_OFF, 0, 0, 0) < 0) {
  66                 pr_err("failed to set power domain off\n");
  67                 ret = -EINVAL;
  68         }
  69
  70         return ret;
  71 }
  72
  73 static int meson_secure_pwrc_on(struct generic_pm_domain *domain)
  74 {
  75         int ret = 0;
  76         struct meson_secure_pwrc_domain *pwrc_domain =
  77                 container_of(domain, struct meson_secure_pwrc_domain, base);
  78
  79         if (meson_sm_call(pwrc_domain->pwrc->fw, SM_A1_PWRC_SET, NULL,
  80                           pwrc_domain->index, PWRC_ON, 0, 0, 0) < 0) {
  81                 pr_err("failed to set power domain on\n");
  82                 ret = -EINVAL;
  83         }
  84
  85         return ret;
  86 }
  87
  88 #define SEC_PD(__name, __flag)                  \
  89 [PWRC_##__name##_ID] =                          \
  90 {                                               \
  91         .name = #__name,                        \
  92         .index = PWRC_##__name##_ID,            \
  93         .is_off = pwrc_secure_is_off,   \
  94         .flags = __flag,                        \
  95 }
  96
  97 static struct meson_secure_pwrc_domain_desc a1_pwrc_domains[] = {
  98         SEC_PD(DSPA,    0),
  99         SEC_PD(DSPB,    0),
 100         /* UART should keep working in ATF after suspend and before resume */
 101         SEC_PD(UART,    GENPD_FLAG_ALWAYS_ON),
 102         /* DMC is for DDR PHY ana/dig and DMC, and should be always on */
 103         SEC_PD(DMC,     GENPD_FLAG_ALWAYS_ON),
 104         SEC_PD(I2C,     0),
 105         SEC_PD(PSRAM,   0),
 106         SEC_PD(ACODEC,  0),
 107         SEC_PD(AUDIO,   0),
 108         SEC_PD(OTP,     0),
 109         SEC_PD(DMA,     GENPD_FLAG_ALWAYS_ON | GENPD_FLAG_IRQ_SAFE),
 110         SEC_PD(SD_EMMC, 0),
 111         SEC_PD(RAMA,    0),
 112         /* SRAMB is used as ATF runtime memory, and should be always on */
 113         SEC_PD(RAMB,    GENPD_FLAG_ALWAYS_ON),
 114         SEC_PD(IR,      0),
 115         SEC_PD(SPICC,   0),
 116         SEC_PD(SPIFC,   0),
 117         SEC_PD(USB,     0),
 118         /* NIC is for the Arm NIC-400 interconnect, and should be always on */
 119         SEC_PD(NIC,     GENPD_FLAG_ALWAYS_ON),
 120         SEC_PD(PDMIN,   0),
 121         SEC_PD(RSA,     0),
 122 };
 123
 124 static struct meson_secure_pwrc_domain_desc c3_pwrc_domains[] = {
 125         SEC_PD(C3_NNA,  0),
 126         SEC_PD(C3_AUDIO,        GENPD_FLAG_ALWAYS_ON),
 127         SEC_PD(C3_SDIOA,        GENPD_FLAG_ALWAYS_ON),
 128         SEC_PD(C3_EMMC, GENPD_FLAG_ALWAYS_ON),
 129         SEC_PD(C3_USB_COMB, GENPD_FLAG_ALWAYS_ON),
 130         SEC_PD(C3_SDCARD,       GENPD_FLAG_ALWAYS_ON),
 131         SEC_PD(C3_ETH,  GENPD_FLAG_ALWAYS_ON),
 132         SEC_PD(C3_GE2D, GENPD_FLAG_ALWAYS_ON),
 133         SEC_PD(C3_CVE,  GENPD_FLAG_ALWAYS_ON),
 134         SEC_PD(C3_GDC_WRAP,     GENPD_FLAG_ALWAYS_ON),
 135         SEC_PD(C3_ISP_TOP,              GENPD_FLAG_ALWAYS_ON),
 136         SEC_PD(C3_MIPI_ISP_WRAP, GENPD_FLAG_ALWAYS_ON),
 137         SEC_PD(C3_VCODEC,       0),
 138 };
 139
 140 static struct meson_secure_pwrc_domain_desc s4_pwrc_domains[] = {
 141         SEC_PD(S4_DOS_HEVC,     0),
 142         SEC_PD(S4_DOS_VDEC,     0),
 143         SEC_PD(S4_VPU_HDMI,     0),
 144         SEC_PD(S4_USB_COMB,     0),
 145         SEC_PD(S4_GE2D,         0),
 146         /* ETH is for ethernet online wakeup, and should be always on */
 147         SEC_PD(S4_ETH,          GENPD_FLAG_ALWAYS_ON),
 148         SEC_PD(S4_DEMOD,        0),
 149         SEC_PD(S4_AUDIO,        0),
 150 };
 151
 152 static int meson_secure_pwrc_probe(struct platform_device *pdev)
 153 {
 154         int i;
 155         struct device_node *sm_np;
 156         struct meson_secure_pwrc *pwrc;
 157         const struct meson_secure_pwrc_domain_data *match;
 158
 159         match = of_device_get_match_data(&pdev->dev);
 160         if (!match) {
 161                 dev_err(&pdev->dev, "failed to get match data\n");
 162                 return -ENODEV;
 163         }
 164
 165         sm_np = of_find_compatible_node(NULL, NULL, "amlogic,meson-gxbb-sm");
 166         if (!sm_np) {
 167                 dev_err(&pdev->dev, "no secure-monitor node\n");
 168                 return -ENODEV;
 169         }
 170
 171         pwrc = devm_kzalloc(&pdev->dev, sizeof(*pwrc), GFP_KERNEL);
 172         if (!pwrc) {
 173                 of_node_put(sm_np);
 174                 return -ENOMEM;
 175         }
 176
 177         pwrc->fw = meson_sm_get(sm_np);
 178         of_node_put(sm_np);
 179         if (!pwrc->fw)
 180                 return -EPROBE_DEFER;
 181
 182         pwrc->xlate.domains = devm_kcalloc(&pdev->dev, match->count,
 183                                            sizeof(*pwrc->xlate.domains),
 184                                            GFP_KERNEL);
 185         if (!pwrc->xlate.domains)
 186                 return -ENOMEM;
 187
 188         pwrc->domains = devm_kcalloc(&pdev->dev, match->count,
 189                                      sizeof(*pwrc->domains), GFP_KERNEL);
 190         if (!pwrc->domains)
 191                 return -ENOMEM;
 192
 193         pwrc->xlate.num_domains = match->count;
 194         platform_set_drvdata(pdev, pwrc);
 195
 196         for (i = 0 ; i < match->count ; ++i) {
 197                 struct meson_secure_pwrc_domain *dom = &pwrc->domains[i];
 198
 199                 if (!match->domains[i].name)
 200                         continue;
 201
 202                 dom->pwrc = pwrc;
 203                 dom->index = match->domains[i].index;
 204                 dom->base.name = match->domains[i].name;
 205                 dom->base.flags = match->domains[i].flags;
 206                 dom->base.power_on = meson_secure_pwrc_on;
 207                 dom->base.power_off = meson_secure_pwrc_off;
 208
 209                 pm_genpd_init(&dom->base, NULL, match->domains[i].is_off(dom));
 210
 211                 pwrc->xlate.domains[i] = &dom->base;
 212         }
 213
 214         return of_genpd_add_provider_onecell(pdev->dev.of_node, &pwrc->xlate);
 215 }
 216
 217 static struct meson_secure_pwrc_domain_data meson_secure_a1_pwrc_data = {
 218         .domains = a1_pwrc_domains,
 219         .count = ARRAY_SIZE(a1_pwrc_domains),
 220 };
 221
 222 static struct meson_secure_pwrc_domain_data amlogic_secure_c3_pwrc_data = {
 223         .domains = c3_pwrc_domains,
 224         .count = ARRAY_SIZE(c3_pwrc_domains),
 225 };
 226
 227 static struct meson_secure_pwrc_domain_data meson_secure_s4_pwrc_data = {
 228         .domains = s4_pwrc_domains,
 229         .count = ARRAY_SIZE(s4_pwrc_domains),
 230 };
 231
 232 static const struct of_device_id meson_secure_pwrc_match_table[] = {
 233         {
 234                 .compatible = "amlogic,meson-a1-pwrc",
 235                 .data = &meson_secure_a1_pwrc_data,
 236         },
 237         {
 238                 .compatible = "amlogic,c3-pwrc",
 239                 .data = &amlogic_secure_c3_pwrc_data,
 240         },
 241         {
 242                 .compatible = "amlogic,meson-s4-pwrc",
 243                 .data = &meson_secure_s4_pwrc_data,
 244         },
 245         { /* sentinel */ }
 246 };
 247 MODULE_DEVICE_TABLE(of, meson_secure_pwrc_match_table);
 248
 249 static struct platform_driver meson_secure_pwrc_driver = {
 250         .probe = meson_secure_pwrc_probe,
 251         .driver = {
 252                 .name           = "meson_secure_pwrc",
 253                 .of_match_table = meson_secure_pwrc_match_table,
 254         },
 255 };
 256 module_platform_driver(meson_secure_pwrc_driver);
 257 MODULE_LICENSE("Dual MIT/GPL");