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