hw/mini2440.c

   1 /*
   2  * mini2440 development board support
   3  *
   4  * Copyright Michel Pollet <buserror@gmail.com>
   5  *
   6  * This code is licensed under the GNU GPL v2.
   7  */
   8
   9 #include "hw.h"
  10 #include "s3c.h"
  11 #include "arm-misc.h"
  12 #include "sysemu.h"
  13 #include "i2c.h"
  14 #include "qemu-timer.h"
  15 #include "devices.h"
  16 #include "audio/audio.h"
  17 #include "boards.h"
  18 #include "console.h"
  19 #include "usb.h"
  20 #include "net.h"
  21 #include "sd.h"
  22 #include "dm9000.h"
  23 #include "eeprom24c0x.h"
  24
  25 #define mini2440_printf(format, ...)    \
  26     fprintf(stderr, "%s: " format, __FUNCTION__, ##__VA_ARGS__)
  27
  28 /* Wiring common to all revisions */
  29 #define MINI2440_GPIO_BACKLIGHT S3C_GPB(1)
  30 #define MINI2440_GPIO_LCD_RESET S3C_GPC(6)
  31 #define MINI2440_GPIO_nSD_DETECT        S3C_GPG(8)
  32 #define MINI2440_IRQ_nSD_DETECT S3C_EINT(16)
  33 #define MINI2440_IRQ_DM9000             S3C_EINT(7)
  34 #define MINI2440_GPIO_DM9000            S3C_GPF(7)
  35
  36 #define MINI2440_GPIO_SDMMC_ON  S3C_GPB(2)
  37 #define MINI2440_GPIO_USB_PULLUP        S3C_GPB(9)
  38 #define MINI2440_GPIO_USB_ATTACH        S3C_GPB(10)
  39
  40 struct mini2440_board_s {
  41     struct s3c_state_s *cpu;
  42     unsigned int ram;
  43     struct ee24c08_s * eeprom;
  44     const char * kernel;
  45     SDState * mmc;
  46     struct nand_flash_s *nand;
  47     int bl_level;
  48 };
  49
  50 /*
  51  * the 24c08 sits on 4 addresses on the bus, and uses the lower address bits
  52  * to address the 256 byte "page" of the eeprom. We thus need to use 4 i2c_slaves
  53  * and keep track of which one was used to set the read/write pointer into the data
  54  */
  55 struct ee24c08_s;
  56 struct ee24c08_slave_s {
  57         i2c_slave slave;
  58         struct ee24c08_s * eeprom;
  59         uint8_t page;
  60 };
  61 struct ee24c08_s {
  62         /* that memory takes 4 addresses */
  63         struct ee24c08_slave_s * slave[4];
  64         uint16_t ptr;
  65         uint16_t count;
  66         uint8_t data[1024];
  67 };
  68
  69 static void ee24c08_event(i2c_slave *i2c, enum i2c_event event)
  70 {
  71     struct ee24c08_slave_s *s = (struct ee24c08_slave_s *) i2c;
  72
  73     s->eeprom->ptr = s->page * 256;
  74     s->eeprom->count = 0;
  75 }
  76
  77 static int ee24c08_tx(i2c_slave *i2c, uint8_t data)
  78 {
  79     struct ee24c08_slave_s *s = (struct ee24c08_slave_s *) i2c;
  80     if (s->eeprom->count++ == 0) {
  81         /* first byte is address offset */
  82         s->eeprom->ptr = (s->page * 256) + data;
  83     } else {
  84         printf("%s: write %04x=%02x\n", __FUNCTION__, s->eeprom->ptr, data);
  85         s->eeprom->data[s->eeprom->ptr] = data;
  86         s->eeprom->ptr = (s->eeprom->ptr & ~0xff) | ((s->eeprom->ptr + 1) & 0xff);
  87         s->eeprom->count++;
  88     }
  89     return 0;
  90 }
  91
  92 static int ee24c08_rx(i2c_slave *i2c)
  93 {
  94     struct ee24c08_slave_s *s = (struct ee24c08_slave_s *) i2c;
  95     uint8_t res =  s->eeprom->data[s->eeprom->ptr];
  96
  97     s->eeprom->ptr = (s->eeprom->ptr & ~0xff) | ((s->eeprom->ptr + 1) & 0xff);
  98     s->eeprom->count++;
  99     return res;
 100 }
 101
 102 static void ee24c08_save(QEMUFile *f, void *opaque)
 103 {
 104         struct ee24c08_s *s = (struct ee24c08_s *) opaque;
 105         int i;
 106
 107     qemu_put_be16s(f, &s->ptr);
 108     qemu_put_be16s(f, &s->count);
 109     qemu_put_buffer(f, s->data, sizeof(s->data));
 110
 111         for (i = 0; i < 4; i++)
 112                 i2c_slave_save(f, &s->slave[i]->slave);
 113 }
 114
 115 static int ee24c08_load(QEMUFile *f, void *opaque, int version_id)
 116 {
 117         struct ee24c08_s *s = (struct ee24c08_s *) opaque;
 118         int i;
 119
 120     qemu_get_be16s(f, &s->ptr);
 121     qemu_get_be16s(f, &s->count);
 122     qemu_get_buffer(f, s->data, sizeof(s->data));
 123
 124         for (i = 0; i < 4; i++)
 125                 i2c_slave_load(f, &s->slave[i]->slave);
 126     return 0;
 127 }
 128
 129 static struct ee24c08_s * ee24c08_init(i2c_bus *bus)
 130 {
 131     struct ee24c08_s *s = (struct ee24c08_s *)
 132             qemu_mallocz(sizeof(struct ee24c08_s));
 133         int i = 0;
 134         memset(s->data, 0xff, sizeof(s->data));
 135
 136         for (i = 0; i < 4; i++) {
 137                 struct ee24c08_slave_s * ss = (struct ee24c08_slave_s *)
 138                         i2c_slave_init(bus, 0x50 + i, sizeof(struct ee24c08_slave_s));
 139                 ss->slave.event = ee24c08_event;
 140                 ss->slave.recv = ee24c08_rx;
 141                 ss->slave.send = ee24c08_tx;
 142                 ss->page = i;
 143                 ss->eeprom = s;
 144                 s->slave[i] = ss;
 145         }
 146     register_savevm("ee24c08", -1, 0, ee24c08_save, ee24c08_load, s);
 147         return s;
 148 }
 149
 150
 151 /* Handlers for output ports */
 152 static void mini2440_bl_switch(void *opaque, int line, int level)
 153 {
 154         printf("%s: LCD Backlight now %s.\n", __FUNCTION__, level ? "on" : "off");
 155 }
 156
 157 static void mini2440_bl_intensity(int line, int level, void *opaque)
 158 {
 159     struct mini2440_board_s *s = (struct mini2440_board_s *) opaque;
 160
 161     if ((level >> 8) != s->bl_level) {
 162         s->bl_level = level >> 8;
 163         printf("%s: LCD Backlight now at %04x\n", __FUNCTION__, s->bl_level);
 164     }
 165 }
 166
 167 static void mini2440_gpio_setup(struct mini2440_board_s *s)
 168 {
 169         /* set the "input" pin values */
 170         s3c_gpio_set_dat(s->cpu->io, S3C_GPG(13), 1);
 171         s3c_gpio_set_dat(s->cpu->io, S3C_GPG(14), 1);
 172         s3c_gpio_set_dat(s->cpu->io, S3C_GPG(15), 0);
 173
 174     s3c_gpio_out_set(s->cpu->io, MINI2440_GPIO_BACKLIGHT,
 175                     *qemu_allocate_irqs(mini2440_bl_switch, s, 1));
 176
 177     s3c_timers_cmp_handler_set(s->cpu->timers, 1, mini2440_bl_intensity, s);
 178
 179     /* this confuses the kernel, we will need a way to bridge this IRQ to the SD system
 180      * right now without this, qemu will not know how to pass the SD card insert/remove
 181      * properly to the kernel
 182         sd_set_cb(s->mmc, 0, s3c_gpio_in_get(s->cpu->io)[MINI2440_IRQ_nSD_DETECT]);
 183          */
 184 }
 185
 186 #if 0
 187 static void hexdump(const void* address, uint32_t len)
 188 {
 189     const unsigned char* p = address;
 190     int i, j;
 191
 192     for (i = 0; i < len; i += 16) {
 193         for (j = 0; j < 16 && i + j < len; j++)
 194             fprintf(stderr, "%02x ", p[i + j]);
 195         for (; j < 16; j++)
 196             fprintf(stderr, "   ");
 197         fprintf(stderr, " ");
 198         for (j = 0; j < 16 && i + j < len; j++)
 199             fprintf(stderr, "%c", (p[i + j] < ' ' || p[i + j] > 0x7f) ? '.' : p[i + j]);
 200         fprintf(stderr, "\n");
 201     }
 202 }
 203 #endif
 204
 205 static int mini2440_load_from_nand(struct nand_flash_s *nand,
 206                 uint32_t nand_offset, uint32_t s3c_base_offset, uint32_t size)
 207 {
 208         uint8_t buffer[512];
 209         uint32_t src = 0;
 210         int page = 0;
 211         uint32_t dst = 0;
 212
 213         if (!nand)
 214                 return 0;
 215
 216         for (page = 0; page < (size / 512); page++, src += 512 + 16, dst += 512)
 217                 if (nand_readraw(nand, nand_offset + src, buffer, 512) == 0) {
 218                         fprintf(stderr, "%s: failed to load nand %d:%d\n", __FUNCTION__,
 219                                 nand_offset + src, 512 + 16);
 220                         return 0;
 221                 } else
 222                         cpu_physical_memory_write(s3c_base_offset + dst, buffer, 512);
 223         return (int) size;
 224 }
 225
 226 static void mini2440_reset(void *opaque)
 227 {
 228     struct mini2440_board_s *s = (struct mini2440_board_s *) opaque;
 229     uint32_t image_size;
 230
 231         /*
 232          * Normally we would load 4 KB of nand to SRAM and jump there, but
 233          * it is not working perfectly as expected, so we cheat and load
 234          * it from nand directly relocated to 0x33f80000 and jump there
 235          */
 236         if (mini2440_load_from_nand(s->nand, 0, S3C_RAM_BASE | 0x03f80000, 256*1024)> 0) {
 237                 fprintf(stderr, "%s: loaded default u-boot from NAND\n", __FUNCTION__);
 238                 s->cpu->env->regs[15] = S3C_RAM_BASE | 0x03f80000; /* start address, u-boot already relocated */
 239         }
 240 #if 0 && defined(LATER)
 241         if (mini2440_load_from_nand(s->nand, 0, S3C_SRAM_BASE_NANDBOOT, S3C_SRAM_SIZE) > 0) {
 242             s->cpu->env->regs[15] = S3C_SRAM_BASE_NANDBOOT;     /* start address, u-boot relocating code */
 243             fprintf(stderr, "%s: 4KB SteppingStone loaded from NAND\n", __FUNCTION__);
 244         }
 245 #endif
 246         /*
 247          * if a u--boot is available as a file, we always use it
 248          */
 249         {
 250             image_size = load_image("mini2440/u-boot.bin", phys_ram_base + 0x03f80000);
 251             if (image_size < 0)
 252                     image_size = load_image("u-boot.bin", phys_ram_base + 0x03f80000);
 253                 if (image_size > 0) {
 254                         if (image_size & (512 -1))      /* round size to a NAND block size */
 255                                 image_size = (image_size + 512) & ~(512-1);
 256                 fprintf(stderr, "%s: loaded override u-boot (size %x)\n", __FUNCTION__, image_size);
 257                     s->cpu->env->regs[15] = S3C_RAM_BASE | 0x03f80000;  /* start address, u-boot already relocated */
 258                 }
 259         }
 260         /*
 261          * if a kernel was explicitly specified, we load it too
 262          */
 263         if (s->kernel) {
 264                 image_size = load_image(s->kernel, phys_ram_base + 0x02000000);
 265                 if (image_size > 0) {
 266                         if (image_size & (512 -1))      /* round size to a NAND block size */
 267                                 image_size = (image_size + 512) & ~(512-1);
 268                 fprintf(stderr, "%s: loaded %s (size %x)\n", __FUNCTION__, s->kernel, image_size);
 269             }
 270         }
 271 }
 272
 273 /* Typical touchscreen calibration values */
 274 static const int mini2440_ts_scale[6] = {
 275     0, (90 - 960) * 256 / 1021, -90 * 256 * 32,
 276     (940 - 75) * 256 / 1021, 0, 75 * 256 * 32,
 277 };
 278
 279 /* Board init.  */
 280 static struct mini2440_board_s *mini2440_init_common(int ram_size,
 281                 const char *kernel_filename, const char *cpu_model,
 282                 SDState *mmc)
 283 {
 284     struct mini2440_board_s *s = (struct mini2440_board_s *)
 285             qemu_mallocz(sizeof(struct mini2440_board_s));
 286
 287     s->ram = 0x04000000;
 288     s->kernel = kernel_filename;
 289     s->mmc = mmc;
 290
 291     /* Setup CPU & memory */
 292     if (ram_size < s->ram + S3C_SRAM_SIZE) {
 293         fprintf(stderr, "This platform requires %i bytes of memory (not %d)\n",
 294                         s->ram + S3C_SRAM_SIZE, ram_size);
 295         exit(1);
 296     }
 297     if (cpu_model && strcmp(cpu_model, "arm920t")) {
 298         fprintf(stderr, "This platform requires an ARM920T core\n");
 299         exit(2);
 300     }
 301     s->cpu = s3c24xx_init(S3C_CPU_2440, s->ram, S3C_SRAM_BASE_NANDBOOT, s->mmc);
 302
 303     /* Setup peripherals */
 304     mini2440_gpio_setup(s);
 305
 306         s->eeprom = ee24c08_init(s3c_i2c_bus(s->cpu->i2c));
 307
 308         {
 309                 NICInfo* nd;
 310                 nd = &nd_table[0];
 311                 if (!nd->model)
 312                     nd->model = "dm9000";
 313                 if (strcmp(nd->model, "dm9000") == 0) {
 314                         dm9000_init(nd, 0x20000000, 0x300, 0x304, s3c_gpio_in_get(s->cpu->io)[MINI2440_IRQ_DM9000]);
 315                 }
 316         }
 317
 318     s3c_adc_setscale(s->cpu->adc, mini2440_ts_scale);
 319
 320     /* Setup initial (reset) machine state */
 321     qemu_register_reset(mini2440_reset, s);
 322 #if 0
 323     arm_load_kernel(s->ram, kernel_filename, kernel_cmdline,
 324                     initrd_filename, 0x49e, S3C_RAM_BASE);
 325 #endif
 326
 327     return s;
 328 }
 329
 330 static void mini2440_init(ram_addr_t ram_size, int vga_ram_size,
 331                 const char *boot_device,
 332                 const char *kernel_filename, const char *kernel_cmdline,
 333                 const char *initrd_filename, const char *cpu_model)
 334 {
 335     struct mini2440_board_s *mini;
 336     int sd_idx = drive_get_index(IF_SD, 0, 0);
 337     SDState *sd = 0;
 338
 339     if (sd_idx >= 0)
 340         sd = sd_init(drives_table[sd_idx].bdrv, 0);
 341
 342     mini = mini2440_init_common(ram_size,
 343                     kernel_filename, cpu_model, sd);
 344
 345         mini->nand = nand_init(NAND_MFR_SAMSUNG, 0x76);
 346     mini->cpu->nand->reg(mini->cpu->nand, mini->nand);
 347
 348     mini2440_reset(mini);
 349 }
 350
 351 QEMUMachine mini2440_machine = {
 352     "mini2440",
 353     "MINI2440 Chinese Samsung SoC dev board (S3C2440A)",
 354     .init = mini2440_init,
 355     .ram_require = (0x04000000 + S3C_SRAM_SIZE) | RAMSIZE_FIXED
 356 };
 357