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 #endif
  68         return BOOT_DEVICE_MMC1;
  69 }
  70
  71 u32 spl_boot_mode(const u32 boot_device)
  72 {
  73         return MMCSD_MODE_RAW;
  74 }
  75
  76 /* read L2 control register (L2CTLR) */
  77 static inline uint32_t read_l2ctlr(void)
  78 {
  79         uint32_t val = 0;
  80
  81         asm volatile ("mrc p15, 1, %0, c9, c0, 2" : "=r" (val));
  82
  83         return val;
  84 }
  85
  86 /* write L2 control register (L2CTLR) */
  87 static inline void write_l2ctlr(uint32_t val)
  88 {
  89         /*
  90          * Note: L2CTLR can only be written when the L2 memory system
  91          * is idle, ie before the MMU is enabled.
  92          */
  93         asm volatile("mcr p15, 1, %0, c9, c0, 2" : : "r" (val) : "memory");
  94         isb();
  95 }
  96
  97 static void configure_l2ctlr(void)
  98 {
  99         uint32_t l2ctlr;
 100
 101         l2ctlr = read_l2ctlr();
 102         l2ctlr &= 0xfffc0000; /* clear bit0~bit17 */
 103
 104         /*
 105         * Data RAM write latency: 2 cycles
 106         * Data RAM read latency: 2 cycles
 107         * Data RAM setup latency: 1 cycle
 108         * Tag RAM write latency: 1 cycle
 109         * Tag RAM read latency: 1 cycle
 110         * Tag RAM setup latency: 1 cycle
 111         */
 112         l2ctlr |= (1 << 3 | 1 << 0);
 113         write_l2ctlr(l2ctlr);
 114 }
 115
 116 #ifdef CONFIG_SPL_MMC_SUPPORT
 117 static int configure_emmc(struct udevice *pinctrl)
 118 {
 119 #if defined(CONFIG_TARGET_CHROMEBOOK_JERRY)
 120
 121         struct gpio_desc desc;
 122         int ret;
 123
 124         pinctrl_request_noflags(pinctrl, PERIPH_ID_EMMC);
 125
 126         /*
 127          * TODO(sjg@chromium.org): Pick this up from device tree or perhaps
 128          * use the EMMC_PWREN setting.
 129          */
 130         ret = dm_gpio_lookup_name("D9", &desc);
 131         if (ret) {
 132                 debug("gpio ret=%d\n", ret);
 133                 return ret;
 134         }
 135         ret = dm_gpio_request(&desc, "emmc_pwren");
 136         if (ret) {
 137                 debug("gpio_request ret=%d\n", ret);
 138                 return ret;
 139         }
 140         ret = dm_gpio_set_dir_flags(&desc, GPIOD_IS_OUT);
 141         if (ret) {
 142                 debug("gpio dir ret=%d\n", ret);
 143                 return ret;
 144         }
 145         ret = dm_gpio_set_value(&desc, 1);
 146         if (ret) {
 147                 debug("gpio value ret=%d\n", ret);
 148                 return ret;
 149         }
 150 #endif
 151         return 0;
 152 }
 153 #endif
 154 extern void back_to_bootrom(void);
 155 void board_init_f(ulong dummy)
 156 {
 157         struct udevice *pinctrl;
 158         struct udevice *dev;
 159         int ret;
 160
 161         /* Example code showing how to enable the debug UART on RK3288 */
 162 #ifdef EARLY_UART
 163 #include <asm/arch/grf_rk3288.h>
 164         /* Enable early UART on the RK3288 */
 165 #define GRF_BASE        0xff770000
 166         struct rk3288_grf * const grf = (void *)GRF_BASE;
 167
 168         rk_clrsetreg(&grf->gpio7ch_iomux, GPIO7C7_MASK << GPIO7C7_SHIFT |
 169                      GPIO7C6_MASK << GPIO7C6_SHIFT,
 170                      GPIO7C7_UART2DBG_SOUT << GPIO7C7_SHIFT |
 171                      GPIO7C6_UART2DBG_SIN << GPIO7C6_SHIFT);
 172         /*
 173          * Debug UART can be used from here if required:
 174          *
 175          * debug_uart_init();
 176          * printch('a');
 177          * printhex8(0x1234);
 178          * printascii("string");
 179          */
 180         debug_uart_init();
 181 #endif
 182
 183         ret = spl_init();
 184         if (ret) {
 185                 debug("spl_init() failed: %d\n", ret);
 186                 hang();
 187         }
 188
 189         rockchip_timer_init();
 190         configure_l2ctlr();
 191
 192         ret = rockchip_get_clk(&dev);
 193         if (ret) {
 194                 debug("CLK init failed: %d\n", ret);
 195                 return;
 196         }
 197
 198         ret = uclass_get_device(UCLASS_PINCTRL, 0, &pinctrl);
 199         if (ret) {
 200                 debug("Pinctrl init failed: %d\n", ret);
 201                 return;
 202         }
 203
 204         ret = uclass_get_device(UCLASS_RAM, 0, &dev);
 205         if (ret) {
 206                 debug("DRAM init failed: %d\n", ret);
 207                 return;
 208         }
 209 #ifdef CONFIG_ROCKCHIP_SPL_BACK_TO_BROM
 210         back_to_bootrom();
 211 #endif
 212 }
 213
 214 static int setup_led(void)
 215 {
 216 #ifdef CONFIG_SPL_LED
 217         struct udevice *dev;
 218         char *led_name;
 219         int ret;
 220
 221         led_name = fdtdec_get_config_string(gd->fdt_blob, "u-boot,boot-led");
 222         if (!led_name)
 223                 return 0;
 224         ret = led_get_by_label(led_name, &dev);
 225         if (ret) {
 226                 debug("%s: get=%d\n", __func__, ret);
 227                 return ret;
 228         }
 229         ret = led_set_on(dev, 1);
 230         if (ret)
 231                 return ret;
 232 #endif
 233
 234         return 0;
 235 }
 236
 237 void spl_board_init(void)
 238 {
 239         struct udevice *pinctrl;
 240         int ret;
 241
 242         ret = setup_led();
 243
 244         if (ret) {
 245                 debug("LED ret=%d\n", ret);
 246                 hang();
 247         }
 248
 249         ret = uclass_get_device(UCLASS_PINCTRL, 0, &pinctrl);
 250         if (ret) {
 251                 debug("%s: Cannot find pinctrl device\n", __func__);
 252                 goto err;
 253         }
 254
 255 #ifdef CONFIG_SPL_MMC_SUPPORT
 256         ret = pinctrl_request_noflags(pinctrl, PERIPH_ID_SDCARD);
 257         if (ret) {
 258                 debug("%s: Failed to set up SD card\n", __func__);
 259                 goto err;
 260         }
 261         ret = configure_emmc(pinctrl);
 262         if (ret) {
 263                 debug("%s: Failed to set up eMMC\n", __func__);
 264                 goto err;
 265         }
 266 #endif
 267
 268         /* Enable debug UART */
 269         ret = pinctrl_request_noflags(pinctrl, PERIPH_ID_UART_DBG);
 270         if (ret) {
 271                 debug("%s: Failed to set up console UART\n", __func__);
 272                 goto err;
 273         }
 274
 275         preloader_console_init();
 276         return;
 277 err:
 278         printf("spl_board_init: Error %d\n", ret);
 279
 280         /* No way to report error here */
 281         hang();
 282 }