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         struct gpio_desc desc;
 117         int ret;
 118
 119         pinctrl_request_noflags(pinctrl, PERIPH_ID_EMMC);
 120
 121         /*
 122          * TODO(sjg@chromium.org): Pick this up from device tree or perhaps
 123          * use the EMMC_PWREN setting.
 124          */
 125         ret = dm_gpio_lookup_name("D9", &desc);
 126         if (ret) {
 127                 debug("gpio ret=%d\n", ret);
 128                 return ret;
 129         }
 130         ret = dm_gpio_request(&desc, "emmc_pwren");
 131         if (ret) {
 132                 debug("gpio_request ret=%d\n", ret);
 133                 return ret;
 134         }
 135         ret = dm_gpio_set_dir_flags(&desc, GPIOD_IS_OUT);
 136         if (ret) {
 137                 debug("gpio dir ret=%d\n", ret);
 138                 return ret;
 139         }
 140         ret = dm_gpio_set_value(&desc, 1);
 141         if (ret) {
 142                 debug("gpio value ret=%d\n", ret);
 143                 return ret;
 144         }
 145
 146         return 0;
 147 }
 148
 149 void board_init_f(ulong dummy)
 150 {
 151         struct udevice *pinctrl;
 152         struct udevice *dev;
 153         int ret;
 154
 155         /* Example code showing how to enable the debug UART on RK3288 */
 156 #ifdef EARLY_UART
 157 #include <asm/arch/grf_rk3288.h>
 158         /* Enable early UART on the RK3288 */
 159 #define GRF_BASE        0xff770000
 160         struct rk3288_grf * const grf = (void *)GRF_BASE;
 161
 162         rk_clrsetreg(&grf->gpio7ch_iomux, GPIO7C7_MASK << GPIO7C7_SHIFT |
 163                      GPIO7C6_MASK << GPIO7C6_SHIFT,
 164                      GPIO7C7_UART2DBG_SOUT << GPIO7C7_SHIFT |
 165                      GPIO7C6_UART2DBG_SIN << GPIO7C6_SHIFT);
 166         /*
 167          * Debug UART can be used from here if required:
 168          *
 169          * debug_uart_init();
 170          * printch('a');
 171          * printhex8(0x1234);
 172          * printascii("string");
 173          */
 174         debug_uart_init();
 175 #endif
 176
 177         ret = spl_init();
 178         if (ret) {
 179                 debug("spl_init() failed: %d\n", ret);
 180                 hang();
 181         }
 182
 183         rockchip_timer_init();
 184         configure_l2ctlr();
 185
 186         ret = uclass_get_device(UCLASS_CLK, 0, &dev);
 187         if (ret) {
 188                 debug("CLK init failed: %d\n", ret);
 189                 return;
 190         }
 191
 192         ret = uclass_get_device(UCLASS_PINCTRL, 0, &pinctrl);
 193         if (ret) {
 194                 debug("Pinctrl init failed: %d\n", ret);
 195                 return;
 196         }
 197
 198         ret = uclass_get_device(UCLASS_RAM, 0, &dev);
 199         if (ret) {
 200                 debug("DRAM init failed: %d\n", ret);
 201                 return;
 202         }
 203 }
 204
 205 static int setup_led(void)
 206 {
 207 #ifdef CONFIG_SPL_LED
 208         struct udevice *dev;
 209         char *led_name;
 210         int ret;
 211
 212         led_name = fdtdec_get_config_string(gd->fdt_blob, "u-boot,boot-led");
 213         if (!led_name)
 214                 return 0;
 215         ret = led_get_by_label(led_name, &dev);
 216         if (ret) {
 217                 debug("%s: get=%d\n", __func__, ret);
 218                 return ret;
 219         }
 220         ret = led_set_on(dev, 1);
 221         if (ret)
 222                 return ret;
 223 #endif
 224
 225         return 0;
 226 }
 227
 228 void spl_board_init(void)
 229 {
 230         struct udevice *pinctrl;
 231         int ret;
 232
 233         ret = setup_led();
 234
 235         if (ret) {
 236                 debug("LED ret=%d\n", ret);
 237                 hang();
 238         }
 239
 240         ret = uclass_get_device(UCLASS_PINCTRL, 0, &pinctrl);
 241         if (ret) {
 242                 debug("%s: Cannot find pinctrl device\n", __func__);
 243                 goto err;
 244         }
 245         ret = pinctrl_request_noflags(pinctrl, PERIPH_ID_SDCARD);
 246         if (ret) {
 247                 debug("%s: Failed to set up SD card\n", __func__);
 248                 goto err;
 249         }
 250         ret = configure_emmc(pinctrl);
 251         if (ret) {
 252                 debug("%s: Failed to set up eMMC\n", __func__);
 253                 goto err;
 254         }
 255
 256         /* Enable debug UART */
 257         ret = pinctrl_request_noflags(pinctrl, PERIPH_ID_UART_DBG);
 258         if (ret) {
 259                 debug("%s: Failed to set up console UART\n", __func__);
 260                 goto err;
 261         }
 262
 263         preloader_console_init();
 264         return;
 265 err:
 266         printf("spl_board_init: Error %d\n", ret);
 267
 268         /* No way to report error here */
 269         hang();
 270 }