board/theobroma-systems/puma_rk3399/puma-rk3399.c

   1 /*
   2  * (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <misc.h>
  10 #include <spl.h>
  11 #include <syscon.h>
  12 #include <usb.h>
  13 #include <dm/pinctrl.h>
  14 #include <dm/uclass-internal.h>
  15 #include <asm/io.h>
  16 #include <asm/gpio.h>
  17 #include <asm/setup.h>
  18 #include <asm/arch/clock.h>
  19 #include <asm/arch/cru_rk3399.h>
  20 #include <asm/arch/hardware.h>
  21 #include <asm/arch/grf_rk3399.h>
  22 #include <asm/arch/periph.h>
  23 #include <power/regulator.h>
  24 #include <u-boot/sha256.h>
  25
  26 DECLARE_GLOBAL_DATA_PTR;
  27
  28 int board_init(void)
  29 {
  30         int ret;
  31
  32         /*
  33          * We need to call into regulators_enable_boot_on() again, as the call
  34          * during SPL may have not included all regulators.
  35          */
  36         ret = regulators_enable_boot_on(false);
  37         if (ret)
  38                 debug("%s: Cannot enable boot on regulator\n", __func__);
  39
  40         return 0;
  41 }
  42
  43 static void rk3399_force_power_on_reset(void)
  44 {
  45         ofnode node;
  46         struct gpio_desc sysreset_gpio;
  47
  48         debug("%s: trying to force a power-on reset\n", __func__);
  49
  50         node = ofnode_path("/config");
  51         if (!ofnode_valid(node)) {
  52                 debug("%s: no /config node?\n", __func__);
  53                 return;
  54         }
  55
  56         if (gpio_request_by_name_nodev(node, "sysreset-gpio", 0,
  57                                        &sysreset_gpio, GPIOD_IS_OUT)) {
  58                 debug("%s: could not find a /config/sysreset-gpio\n", __func__);
  59                 return;
  60         }
  61
  62         dm_gpio_set_value(&sysreset_gpio, 1);
  63 }
  64
  65 void spl_board_init(void)
  66 {
  67         int  ret;
  68         struct rk3399_cru *cru = rockchip_get_cru();
  69
  70         /*
  71          * The RK3399 resets only 'almost all logic' (see also in the TRM
  72          * "3.9.4 Global software reset"), when issuing a software reset.
  73          * This may cause issues during boot-up for some configurations of
  74          * the application software stack.
  75          *
  76          * To work around this, we test whether the last reset reason was
  77          * a power-on reset and (if not) issue an overtemp-reset to reset
  78          * the entire module.
  79          *
  80          * While this was previously fixed by modifying the various places
  81          * that could generate a software reset (e.g. U-Boot's sysreset
  82          * driver, the ATF or Linux), we now have it here to ensure that
  83          * we no longer have to track this through the various components.
  84          */
  85         if (cru->glb_rst_st != 0)
  86                 rk3399_force_power_on_reset();
  87
  88         /*
  89          * Turning the eMMC and SPI back on (if disabled via the Qseven
  90          * BIOS_ENABLE) signal is done through a always-on regulator).
  91          */
  92         ret = regulators_enable_boot_on(false);
  93         if (ret)
  94                 debug("%s: Cannot enable boot on regulator\n", __func__);
  95
  96         preloader_console_init();
  97 }
  98
  99 static void setup_macaddr(void)
 100 {
 101 #if CONFIG_IS_ENABLED(CMD_NET)
 102         int ret;
 103         const char *cpuid = env_get("cpuid#");
 104         u8 hash[SHA256_SUM_LEN];
 105         int size = sizeof(hash);
 106         u8 mac_addr[6];
 107
 108         /* Only generate a MAC address, if none is set in the environment */
 109         if (env_get("ethaddr"))
 110                 return;
 111
 112         if (!cpuid) {
 113                 debug("%s: could not retrieve 'cpuid#'\n", __func__);
 114                 return;
 115         }
 116
 117         ret = hash_block("sha256", (void *)cpuid, strlen(cpuid), hash, &size);
 118         if (ret) {
 119                 debug("%s: failed to calculate SHA256\n", __func__);
 120                 return;
 121         }
 122
 123         /* Copy 6 bytes of the hash to base the MAC address on */
 124         memcpy(mac_addr, hash, 6);
 125
 126         /* Make this a valid MAC address and set it */
 127         mac_addr[0] &= 0xfe;  /* clear multicast bit */
 128         mac_addr[0] |= 0x02;  /* set local assignment bit (IEEE802) */
 129         eth_env_set_enetaddr("ethaddr", mac_addr);
 130 #endif
 131 }
 132
 133 static void setup_serial(void)
 134 {
 135 #if CONFIG_IS_ENABLED(ROCKCHIP_EFUSE)
 136         const u32 cpuid_offset = 0x7;
 137         const u32 cpuid_length = 0x10;
 138
 139         struct udevice *dev;
 140         int ret, i;
 141         u8 cpuid[cpuid_length];
 142         u8 low[cpuid_length/2], high[cpuid_length/2];
 143         char cpuid_str[cpuid_length * 2 + 1];
 144         u64 serialno;
 145         char serialno_str[17];
 146
 147         /* retrieve the device */
 148         ret = uclass_get_device_by_driver(UCLASS_MISC,
 149                                           DM_GET_DRIVER(rockchip_efuse), &dev);
 150         if (ret) {
 151                 debug("%s: could not find efuse device\n", __func__);
 152                 return;
 153         }
 154
 155         /* read the cpu_id range from the efuses */
 156         ret = misc_read(dev, cpuid_offset, &cpuid, sizeof(cpuid));
 157         if (ret) {
 158                 debug("%s: reading cpuid from the efuses failed\n",
 159                       __func__);
 160                 return;
 161         }
 162
 163         memset(cpuid_str, 0, sizeof(cpuid_str));
 164         for (i = 0; i < 16; i++)
 165                 sprintf(&cpuid_str[i * 2], "%02x", cpuid[i]);
 166
 167         debug("cpuid: %s\n", cpuid_str);
 168
 169         /*
 170          * Mix the cpuid bytes using the same rules as in
 171          *   ${linux}/drivers/soc/rockchip/rockchip-cpuinfo.c
 172          */
 173         for (i = 0; i < 8; i++) {
 174                 low[i] = cpuid[1 + (i << 1)];
 175                 high[i] = cpuid[i << 1];
 176         }
 177
 178         serialno = crc32_no_comp(0, low, 8);
 179         serialno |= (u64)crc32_no_comp(serialno, high, 8) << 32;
 180         snprintf(serialno_str, sizeof(serialno_str), "%016llx", serialno);
 181
 182         env_set("cpuid#", cpuid_str);
 183         env_set("serial#", serialno_str);
 184 #endif
 185 }
 186
 187 static void setup_iodomain(void)
 188 {
 189         const u32 GRF_IO_VSEL_GPIO4CD_SHIFT = 3;
 190         struct rk3399_grf_regs *grf =
 191             syscon_get_first_range(ROCKCHIP_SYSCON_GRF);
 192
 193         /*
 194          * Set bit 3 in GRF_IO_VSEL so PCIE_RST# works (pin GPIO4_C6).
 195          * Linux assumes that PCIE_RST# works out of the box as it probes
 196          * PCIe before loading the iodomain driver.
 197          */
 198         rk_setreg(&grf->io_vsel, 1 << GRF_IO_VSEL_GPIO4CD_SHIFT);
 199 }
 200
 201 int misc_init_r(void)
 202 {
 203         setup_serial();
 204         setup_macaddr();
 205         setup_iodomain();
 206
 207         return 0;
 208 }
 209
 210 #ifdef CONFIG_SERIAL_TAG
 211 void get_board_serial(struct tag_serialnr *serialnr)
 212 {
 213         char *serial_string;
 214         u64 serial = 0;
 215
 216         serial_string = env_get("serial#");
 217
 218         if (serial_string)
 219                 serial = simple_strtoull(serial_string, NULL, 16);
 220
 221         serialnr->high = (u32)(serial >> 32);
 222         serialnr->low = (u32)(serial & 0xffffffff);
 223 }
 224 #endif
 225
 226 /**
 227  * Switch power at an external regulator (for our root hub).
 228  *
 229  * @param ctrl pointer to the xHCI controller
 230  * @param port port number as in the control message (one-based)
 231  * @param enable boolean indicating whether to enable or disable power
 232  * @return returns 0 on success, an error-code on failure
 233  */
 234 static int board_usb_port_power_set(struct udevice *dev, int port,
 235                                     bool enable)
 236 {
 237 #if CONFIG_IS_ENABLED(OF_CONTROL) && CONFIG_IS_ENABLED(DM_REGULATOR)
 238         /* We start counting ports at 0, while USB counts from 1. */
 239         int index = port - 1;
 240         const char *regname = NULL;
 241         struct udevice *regulator;
 242         const char *prop = "tsd,usb-port-power";
 243         int ret;
 244
 245         debug("%s: ctrl '%s' port %d enable %s\n", __func__,
 246               dev_read_name(dev), port, enable ? "true" : "false");
 247
 248         ret = dev_read_string_index(dev, prop, index, &regname);
 249         if (ret < 0) {
 250                 debug("%s: ctrl '%s' port %d: no entry in '%s'\n",
 251                       __func__, dev_read_name(dev), port, prop);
 252                 return ret;
 253         }
 254
 255         ret = regulator_get_by_platname(regname, &regulator);
 256         if (ret) {
 257                 debug("%s: ctrl '%s' port %d: could not get regulator '%s'\n",
 258                       __func__, dev_read_name(dev), port, regname);
 259                 return ret;
 260         }
 261
 262         regulator_set_enable(regulator, enable);
 263         return 0;
 264 #else
 265         return -ENOTSUPP;
 266 #endif
 267 }
 268
 269 void usb_hub_reset_devices(struct usb_hub_device *hub, int port)
 270 {
 271         struct udevice *dev = hub->pusb_dev->dev;
 272         struct udevice *ctrl;
 273
 274         /* We are only interested in our root-hubs */
 275         if (usb_hub_is_root_hub(dev) == false)
 276                 return;
 277
 278         ctrl = usb_get_bus(dev);
 279         if (!ctrl) {
 280                 debug("%s: could not retrieve ctrl for hub\n", __func__);
 281                 return;
 282         }
 283
 284         /*
 285          * To work around an incompatibility between the single-threaded
 286          * USB stack in U-Boot and (a strange low-power mode of) the USB
 287          * hub we have on-module, we need to delay powering on the hub
 288          * until the first time the port is probed.
 289          */
 290         board_usb_port_power_set(ctrl, port, true);
 291 }