arch/arm/mach-rockchip/rk3288-board-spl.c

   1 /*
   2  * (C) Copyright 2015 Google, Inc
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <debug_uart.h>
   9 #include <dm.h>
  10 #include <fdtdec.h>
  11 #include <led.h>
  12 #include <malloc.h>
  13 #include <ram.h>
  14 #include <spl.h>
  15 #include <asm/gpio.h>
  16 #include <asm/io.h>
  17 #include <asm/arch/clock.h>
  18 #include <asm/arch/hardware.h>
  19 #include <asm/arch/periph.h>
  20 #include <asm/arch/sdram.h>
  21 #include <asm/arch/timer.h>
  22 #include <dm/pinctrl.h>
  23 #include <dm/root.h>
  24 #include <dm/test.h>
  25 #include <dm/util.h>
  26 #include <power/regulator.h>
  27
  28 DECLARE_GLOBAL_DATA_PTR;
  29
  30 u32 spl_boot_device(void)
  31 {
  32 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
  33         const void *blob = gd->fdt_blob;
  34         struct udevice *dev;
  35         const char *bootdev;
  36         int node;
  37         int ret;
  38
  39         bootdev = fdtdec_get_config_string(blob, "u-boot,boot0");
  40         debug("Boot device %s\n", bootdev);
  41         if (!bootdev)
  42                 goto fallback;
  43
  44         node = fdt_path_offset(blob, bootdev);
  45         if (node < 0) {
  46                 debug("node=%d\n", node);
  47                 goto fallback;
  48         }
  49         ret = device_get_global_by_of_offset(node, &dev);
  50         if (ret) {
  51                 debug("device at node %s/%d not found: %d\n", bootdev, node,
  52                       ret);
  53                 goto fallback;
  54         }
  55         debug("Found device %s\n", dev->name);
  56         switch (device_get_uclass_id(dev)) {
  57         case UCLASS_SPI_FLASH:
  58                 return BOOT_DEVICE_SPI;
  59         case UCLASS_MMC:
  60                 return BOOT_DEVICE_MMC1;
  61         default:
  62                 debug("Booting from device uclass '%s' not supported\n",
  63                       dev_get_uclass_name(dev));
  64         }
  65
  66 fallback:
  67 #elif defined(CONFIG_TARGET_CHROMEBOOK_JERRY) || \
  68                 defined(CONFIG_TARGET_CHROMEBIT_MICKEY) || \
  69                 defined(CONFIG_TARGET_CHROMEBOOK_MINNIE)
  70         return BOOT_DEVICE_SPI;
  71 #endif
  72         return BOOT_DEVICE_MMC1;
  73 }
  74
  75 u32 spl_boot_mode(const u32 boot_device)
  76 {
  77         return MMCSD_MODE_RAW;
  78 }
  79
  80 /* read L2 control register (L2CTLR) */
  81 static inline uint32_t read_l2ctlr(void)
  82 {
  83         uint32_t val = 0;
  84
  85         asm volatile ("mrc p15, 1, %0, c9, c0, 2" : "=r" (val));
  86
  87         return val;
  88 }
  89
  90 /* write L2 control register (L2CTLR) */
  91 static inline void write_l2ctlr(uint32_t val)
  92 {
  93         /*
  94          * Note: L2CTLR can only be written when the L2 memory system
  95          * is idle, ie before the MMU is enabled.
  96          */
  97         asm volatile("mcr p15, 1, %0, c9, c0, 2" : : "r" (val) : "memory");
  98         isb();
  99 }
 100
 101 static void configure_l2ctlr(void)
 102 {
 103         uint32_t l2ctlr;
 104
 105         l2ctlr = read_l2ctlr();
 106         l2ctlr &= 0xfffc0000; /* clear bit0~bit17 */
 107
 108         /*
 109         * Data RAM write latency: 2 cycles
 110         * Data RAM read latency: 2 cycles
 111         * Data RAM setup latency: 1 cycle
 112         * Tag RAM write latency: 1 cycle
 113         * Tag RAM read latency: 1 cycle
 114         * Tag RAM setup latency: 1 cycle
 115         */
 116         l2ctlr |= (1 << 3 | 1 << 0);
 117         write_l2ctlr(l2ctlr);
 118 }
 119
 120 #ifdef CONFIG_SPL_MMC_SUPPORT
 121 static int configure_emmc(struct udevice *pinctrl)
 122 {
 123 #if defined(CONFIG_TARGET_CHROMEBOOK_JERRY)
 124
 125         struct gpio_desc desc;
 126         int ret;
 127
 128         pinctrl_request_noflags(pinctrl, PERIPH_ID_EMMC);
 129
 130         /*
 131          * TODO(sjg@chromium.org): Pick this up from device tree or perhaps
 132          * use the EMMC_PWREN setting.
 133          */
 134         ret = dm_gpio_lookup_name("D9", &desc);
 135         if (ret) {
 136                 debug("gpio ret=%d\n", ret);
 137                 return ret;
 138         }
 139         ret = dm_gpio_request(&desc, "emmc_pwren");
 140         if (ret) {
 141                 debug("gpio_request ret=%d\n", ret);
 142                 return ret;
 143         }
 144         ret = dm_gpio_set_dir_flags(&desc, GPIOD_IS_OUT);
 145         if (ret) {
 146                 debug("gpio dir ret=%d\n", ret);
 147                 return ret;
 148         }
 149         ret = dm_gpio_set_value(&desc, 1);
 150         if (ret) {
 151                 debug("gpio value ret=%d\n", ret);
 152                 return ret;
 153         }
 154 #endif
 155         return 0;
 156 }
 157 #endif
 158 extern void back_to_bootrom(void);
 159 void board_init_f(ulong dummy)
 160 {
 161         struct udevice *pinctrl;
 162         struct udevice *dev;
 163         int ret;
 164
 165         /* Example code showing how to enable the debug UART on RK3288 */
 166 #ifdef EARLY_UART
 167 #include <asm/arch/grf_rk3288.h>
 168         /* Enable early UART on the RK3288 */
 169 #define GRF_BASE        0xff770000
 170         struct rk3288_grf * const grf = (void *)GRF_BASE;
 171
 172         rk_clrsetreg(&grf->gpio7ch_iomux, GPIO7C7_MASK << GPIO7C7_SHIFT |
 173                      GPIO7C6_MASK << GPIO7C6_SHIFT,
 174                      GPIO7C7_UART2DBG_SOUT << GPIO7C7_SHIFT |
 175                      GPIO7C6_UART2DBG_SIN << GPIO7C6_SHIFT);
 176         /*
 177          * Debug UART can be used from here if required:
 178          *
 179          * debug_uart_init();
 180          * printch('a');
 181          * printhex8(0x1234);
 182          * printascii("string");
 183          */
 184         debug_uart_init();
 185 #endif
 186
 187         ret = spl_init();
 188         if (ret) {
 189                 debug("spl_init() failed: %d\n", ret);
 190                 hang();
 191         }
 192
 193         rockchip_timer_init();
 194         configure_l2ctlr();
 195
 196         ret = rockchip_get_clk(&dev);
 197         if (ret) {
 198                 debug("CLK init failed: %d\n", ret);
 199                 return;
 200         }
 201
 202         ret = uclass_get_device(UCLASS_PINCTRL, 0, &pinctrl);
 203         if (ret) {
 204                 debug("Pinctrl init failed: %d\n", ret);
 205                 return;
 206         }
 207
 208         ret = uclass_get_device(UCLASS_RAM, 0, &dev);
 209         if (ret) {
 210                 debug("DRAM init failed: %d\n", ret);
 211                 return;
 212         }
 213 #if defined(CONFIG_ROCKCHIP_SPL_BACK_TO_BROM) && !defined(CONFIG_SPL_BOARD_INIT)
 214         back_to_bootrom();
 215 #endif
 216 }
 217
 218 static int setup_led(void)
 219 {
 220 #ifdef CONFIG_SPL_LED
 221         struct udevice *dev;
 222         char *led_name;
 223         int ret;
 224
 225         led_name = fdtdec_get_config_string(gd->fdt_blob, "u-boot,boot-led");
 226         if (!led_name)
 227                 return 0;
 228         ret = led_get_by_label(led_name, &dev);
 229         if (ret) {
 230                 debug("%s: get=%d\n", __func__, ret);
 231                 return ret;
 232         }
 233         ret = led_set_on(dev, 1);
 234         if (ret)
 235                 return ret;
 236 #endif
 237
 238         return 0;
 239 }
 240
 241 void spl_board_init(void)
 242 {
 243         struct udevice *pinctrl;
 244         int ret;
 245
 246         ret = setup_led();
 247
 248         if (ret) {
 249                 debug("LED ret=%d\n", ret);
 250                 hang();
 251         }
 252
 253         ret = uclass_get_device(UCLASS_PINCTRL, 0, &pinctrl);
 254         if (ret) {
 255                 debug("%s: Cannot find pinctrl device\n", __func__);
 256                 goto err;
 257         }
 258
 259 #ifdef CONFIG_SPL_MMC_SUPPORT
 260         ret = pinctrl_request_noflags(pinctrl, PERIPH_ID_SDCARD);
 261         if (ret) {
 262                 debug("%s: Failed to set up SD card\n", __func__);
 263                 goto err;
 264         }
 265         ret = configure_emmc(pinctrl);
 266         if (ret) {
 267                 debug("%s: Failed to set up eMMC\n", __func__);
 268                 goto err;
 269         }
 270 #endif
 271
 272         /* Enable debug UART */
 273         ret = pinctrl_request_noflags(pinctrl, PERIPH_ID_UART_DBG);
 274         if (ret) {
 275                 debug("%s: Failed to set up console UART\n", __func__);
 276                 goto err;
 277         }
 278
 279         preloader_console_init();
 280 #ifdef CONFIG_ROCKCHIP_SPL_BACK_TO_BROM
 281         back_to_bootrom();
 282 #endif
 283         return;
 284 err:
 285         printf("spl_board_init: Error %d\n", ret);
 286
 287         /* No way to report error here */
 288         hang();
 289 }