bootloader/rk27xx.c

   1 #include <stdio.h>
   2 #include <system.h>
   3 #include <inttypes.h>
   4 #include "config.h"
   5 #include "gcc_extensions.h"
   6 #include "lcd.h"
   7 #include "font.h"
   8 #include "backlight.h"
   9 #include "adc.h"
  10 #include "button-target.h"
  11 #include "button.h"
  12 #include "common.h"
  13 #include "storage.h"
  14 #include "disk.h"
  15 #include "panic.h"
  16 #include "power.h"
  17 #include "string.h"
  18 #include "file.h"
  19 #include "crc32-rkw.h"
  20 #include "rkw-loader.h"
  21 #include "version.h"
  22
  23 /* beginning of DRAM */
  24 #define DRAM_ORIG 0x60000000
  25
  26 /* bootloader code runs from 0x60700000
  27  * so we cannot load more code to not overwrite ourself
  28  */
  29 #define LOAD_SIZE 0x700000
  30
  31 extern void show_logo( void );
  32
  33 /* This function setup bare minimum
  34  * and jumps to rom in order to activate
  35  * hardcoded rkusb mode
  36  */
  37 static void enter_rkusb(void)
  38 {
  39     asm volatile (
  40         /* turn off cache */
  41         "ldr     r0, =0xefff0000 \n"
  42         "ldrh    r1, [r0] \n"
  43         "strh    r1, [r0] \n"
  44
  45         /* turn off interrupts */
  46         "mrs     r0, cpsr \n"
  47         "bic     r0, r0, #0x1f \n"
  48         "orr     r0, r0, #0xd3 \n"
  49         "msr     cpsr, r0 \n"
  50
  51         /* disable iram remap */
  52         "mov     r0, #0x18000000 \n"
  53         "add     r0, r0, #0x1c000 \n"
  54         "mov     r1, #0 \n"
  55         "str     r1, [r0, #4] \n"
  56
  57         /* setup stacks in unmapped
  58          * iram just as rom will do
  59          */
  60         "msr     cpsr, #0xd2 \n"
  61         "ldr     r1, =0x18200274 \n"
  62         "add     r1, r1, #0x200 \n"
  63         "mov     sp, r1 \n"
  64         "msr     cpsr, #0xd3 \n"
  65         "add     r1, r1, #0x400 \n"
  66         "mov     sp, r1 \n"
  67
  68         /* jump to main() in rom
  69          * just before dfu handler
  70          */
  71         "ldr     r0, =0xec0 \n"
  72         "bx      r0 \n"
  73     );
  74 }
  75
  76 void main(void) NORETURN_ATTR;
  77 void main(void)
  78 {
  79     char filename[MAX_PATH];
  80     unsigned char* loadbuffer;
  81     void(*kernel_entry)(void);
  82     int ret;
  83     enum {rb, of} boot = rb;
  84
  85     power_init();
  86     system_init();
  87     kernel_init();
  88     enable_irq();
  89
  90     adc_init();
  91     lcd_init();
  92     backlight_init();
  93     button_init_device();
  94
  95     font_init();
  96     lcd_setfont(FONT_SYSFIXED);
  97
  98     show_logo();
  99
 100     int btn = button_read_device();
 101
 102     /* if there is some other button pressed
 103      * besides POWER/PLAY we boot into OF
 104      */
 105     if ((btn & ~POWEROFF_BUTTON))
 106         boot = of;
 107
 108     /* if we are woken up by USB insert boot into OF */
 109     if (DEV_INFO & (1<<20))
 110         boot = of;
 111
 112     lcd_clear_display();
 113
 114     ret = storage_init();
 115     if(ret < 0)
 116         error(EATA, ret, true);
 117
 118     while(!disk_init(IF_MV(0)))
 119         panicf("disk_init failed!");
 120
 121     while((ret = disk_mount_all()) <= 0)
 122         error(EDISK, ret, true);
 123
 124     loadbuffer = (unsigned char*)DRAM_ORIG; /* DRAM */
 125
 126     if (boot == rb)
 127         snprintf(filename,sizeof(filename), BOOTDIR "/%s", BOOTFILE);
 128     else if (boot == of)
 129         snprintf(filename,sizeof(filename), BOOTDIR "/%s", "BASE.RKW");
 130
 131     printf("Bootloader version: %s", RBVERSION);
 132     printf("Loading: %s", filename);
 133
 134     ret = load_rkw(loadbuffer, filename, LOAD_SIZE);
 135     if (ret < 0)
 136     {
 137         printf(rkw_strerror(ret));
 138         lcd_update();
 139         sleep(5*HZ);
 140
 141         /* if we boot rockbox we shutdown on error
 142          * if we boot OF we fall back to rkusb mode on error
 143          */
 144         if (boot == rb)
 145         {
 146             power_off();
 147         }
 148         else
 149         {
 150             /* give visual feedback what we are doing */
 151             printf("Entering rockchip USB mode...");
 152             lcd_update();
 153
 154             enter_rkusb();
 155         }
 156     }
 157     else
 158     {
 159         /* print 'Loading OK' */
 160         printf(rkw_strerror(0));
 161         sleep(HZ);
 162     }
 163
 164     /* jump to entrypoint */
 165     kernel_entry = (void*) loadbuffer;
 166     commit_discard_idcache();
 167
 168     printf("Executing");
 169     kernel_entry();
 170
 171     /* this should never be reached actually */
 172     printf("ERR: Failed to boot");
 173     sleep(5*HZ);
 174
 175     if (boot == rb)
 176     {
 177         power_off();
 178     }
 179     else
 180     {
 181         /* give visual feedback what we are doing */
 182         printf("Entering rockchip USB mode...");
 183         lcd_update();
 184
 185         enter_rkusb();
 186     }
 187
 188     /* hang */
 189     while(1);
 190 }