hw/m68k/mcf5208.c

   1 /*
   2  * Motorola ColdFire MCF5208 SoC emulation.
   3  *
   4  * Copyright (c) 2007 CodeSourcery.
   5  *
   6  * This code is licensed under the GPL
   7  */
   8
   9 #include "qemu/osdep.h"
  10 #include "qemu/units.h"
  11 #include "qemu/error-report.h"
  12 #include "qemu/log.h"
  13 #include "qapi/error.h"
  14 #include "qemu-common.h"
  15 #include "qemu/datadir.h"
  16 #include "cpu.h"
  17 #include "hw/irq.h"
  18 #include "hw/m68k/mcf.h"
  19 #include "hw/m68k/mcf_fec.h"
  20 #include "qemu/timer.h"
  21 #include "hw/ptimer.h"
  22 #include "sysemu/sysemu.h"
  23 #include "sysemu/qtest.h"
  24 #include "net/net.h"
  25 #include "hw/boards.h"
  26 #include "hw/loader.h"
  27 #include "hw/sysbus.h"
  28 #include "elf.h"
  29
  30 #define SYS_FREQ 166666666
  31
  32 #define ROM_SIZE 0x200000
  33
  34 #define PCSR_EN         0x0001
  35 #define PCSR_RLD        0x0002
  36 #define PCSR_PIF        0x0004
  37 #define PCSR_PIE        0x0008
  38 #define PCSR_OVW        0x0010
  39 #define PCSR_DBG        0x0020
  40 #define PCSR_DOZE       0x0040
  41 #define PCSR_PRE_SHIFT  8
  42 #define PCSR_PRE_MASK   0x0f00
  43
  44 typedef struct {
  45     MemoryRegion iomem;
  46     qemu_irq irq;
  47     ptimer_state *timer;
  48     uint16_t pcsr;
  49     uint16_t pmr;
  50     uint16_t pcntr;
  51 } m5208_timer_state;
  52
  53 static void m5208_timer_update(m5208_timer_state *s)
  54 {
  55     if ((s->pcsr & (PCSR_PIE | PCSR_PIF)) == (PCSR_PIE | PCSR_PIF))
  56         qemu_irq_raise(s->irq);
  57     else
  58         qemu_irq_lower(s->irq);
  59 }
  60
  61 static void m5208_timer_write(void *opaque, hwaddr offset,
  62                               uint64_t value, unsigned size)
  63 {
  64     m5208_timer_state *s = (m5208_timer_state *)opaque;
  65     int prescale;
  66     int limit;
  67     switch (offset) {
  68     case 0:
  69         /* The PIF bit is set-to-clear.  */
  70         if (value & PCSR_PIF) {
  71             s->pcsr &= ~PCSR_PIF;
  72             value &= ~PCSR_PIF;
  73         }
  74         /* Avoid frobbing the timer if we're just twiddling IRQ bits. */
  75         if (((s->pcsr ^ value) & ~PCSR_PIE) == 0) {
  76             s->pcsr = value;
  77             m5208_timer_update(s);
  78             return;
  79         }
  80
  81         ptimer_transaction_begin(s->timer);
  82         if (s->pcsr & PCSR_EN)
  83             ptimer_stop(s->timer);
  84
  85         s->pcsr = value;
  86
  87         prescale = 1 << ((s->pcsr & PCSR_PRE_MASK) >> PCSR_PRE_SHIFT);
  88         ptimer_set_freq(s->timer, (SYS_FREQ / 2) / prescale);
  89         if (s->pcsr & PCSR_RLD)
  90             limit = s->pmr;
  91         else
  92             limit = 0xffff;
  93         ptimer_set_limit(s->timer, limit, 0);
  94
  95         if (s->pcsr & PCSR_EN)
  96             ptimer_run(s->timer, 0);
  97         ptimer_transaction_commit(s->timer);
  98         break;
  99     case 2:
 100         ptimer_transaction_begin(s->timer);
 101         s->pmr = value;
 102         s->pcsr &= ~PCSR_PIF;
 103         if ((s->pcsr & PCSR_RLD) == 0) {
 104             if (s->pcsr & PCSR_OVW)
 105                 ptimer_set_count(s->timer, value);
 106         } else {
 107             ptimer_set_limit(s->timer, value, s->pcsr & PCSR_OVW);
 108         }
 109         ptimer_transaction_commit(s->timer);
 110         break;
 111     case 4:
 112         break;
 113     default:
 114         qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIX "\n",
 115                       __func__, offset);
 116         return;
 117     }
 118     m5208_timer_update(s);
 119 }
 120
 121 static void m5208_timer_trigger(void *opaque)
 122 {
 123     m5208_timer_state *s = (m5208_timer_state *)opaque;
 124     s->pcsr |= PCSR_PIF;
 125     m5208_timer_update(s);
 126 }
 127
 128 static uint64_t m5208_timer_read(void *opaque, hwaddr addr,
 129                                  unsigned size)
 130 {
 131     m5208_timer_state *s = (m5208_timer_state *)opaque;
 132     switch (addr) {
 133     case 0:
 134         return s->pcsr;
 135     case 2:
 136         return s->pmr;
 137     case 4:
 138         return ptimer_get_count(s->timer);
 139     default:
 140         qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIX "\n",
 141                       __func__, addr);
 142         return 0;
 143     }
 144 }
 145
 146 static const MemoryRegionOps m5208_timer_ops = {
 147     .read = m5208_timer_read,
 148     .write = m5208_timer_write,
 149     .endianness = DEVICE_NATIVE_ENDIAN,
 150 };
 151
 152 static uint64_t m5208_sys_read(void *opaque, hwaddr addr,
 153                                unsigned size)
 154 {
 155     switch (addr) {
 156     case 0x110: /* SDCS0 */
 157         {
 158             int n;
 159             for (n = 0; n < 32; n++) {
 160                 if (current_machine->ram_size < (2u << n)) {
 161                     break;
 162                 }
 163             }
 164             return (n - 1)  | 0x40000000;
 165         }
 166     case 0x114: /* SDCS1 */
 167         return 0;
 168
 169     default:
 170         qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIX "\n",
 171                       __func__, addr);
 172         return 0;
 173     }
 174 }
 175
 176 static void m5208_sys_write(void *opaque, hwaddr addr,
 177                             uint64_t value, unsigned size)
 178 {
 179     qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIX "\n",
 180                   __func__, addr);
 181 }
 182
 183 static const MemoryRegionOps m5208_sys_ops = {
 184     .read = m5208_sys_read,
 185     .write = m5208_sys_write,
 186     .endianness = DEVICE_NATIVE_ENDIAN,
 187 };
 188
 189 static void mcf5208_sys_init(MemoryRegion *address_space, qemu_irq *pic)
 190 {
 191     MemoryRegion *iomem = g_new(MemoryRegion, 1);
 192     m5208_timer_state *s;
 193     int i;
 194
 195     /* SDRAMC.  */
 196     memory_region_init_io(iomem, NULL, &m5208_sys_ops, NULL, "m5208-sys", 0x00004000);
 197     memory_region_add_subregion(address_space, 0xfc0a8000, iomem);
 198     /* Timers.  */
 199     for (i = 0; i < 2; i++) {
 200         s = g_new0(m5208_timer_state, 1);
 201         s->timer = ptimer_init(m5208_timer_trigger, s, PTIMER_POLICY_DEFAULT);
 202         memory_region_init_io(&s->iomem, NULL, &m5208_timer_ops, s,
 203                               "m5208-timer", 0x00004000);
 204         memory_region_add_subregion(address_space, 0xfc080000 + 0x4000 * i,
 205                                     &s->iomem);
 206         s->irq = pic[4 + i];
 207     }
 208 }
 209
 210 static void mcf_fec_init(MemoryRegion *sysmem, NICInfo *nd, hwaddr base,
 211                          qemu_irq *irqs)
 212 {
 213     DeviceState *dev;
 214     SysBusDevice *s;
 215     int i;
 216
 217     qemu_check_nic_model(nd, TYPE_MCF_FEC_NET);
 218     dev = qdev_new(TYPE_MCF_FEC_NET);
 219     qdev_set_nic_properties(dev, nd);
 220
 221     s = SYS_BUS_DEVICE(dev);
 222     sysbus_realize_and_unref(s, &error_fatal);
 223     for (i = 0; i < FEC_NUM_IRQ; i++) {
 224         sysbus_connect_irq(s, i, irqs[i]);
 225     }
 226
 227     memory_region_add_subregion(sysmem, base, sysbus_mmio_get_region(s, 0));
 228 }
 229
 230 static void mcf5208evb_init(MachineState *machine)
 231 {
 232     ram_addr_t ram_size = machine->ram_size;
 233     const char *kernel_filename = machine->kernel_filename;
 234     M68kCPU *cpu;
 235     CPUM68KState *env;
 236     int kernel_size;
 237     uint64_t elf_entry;
 238     hwaddr entry;
 239     qemu_irq *pic;
 240     MemoryRegion *address_space_mem = get_system_memory();
 241     MemoryRegion *rom = g_new(MemoryRegion, 1);
 242     MemoryRegion *sram = g_new(MemoryRegion, 1);
 243
 244     cpu = M68K_CPU(cpu_create(machine->cpu_type));
 245     env = &cpu->env;
 246
 247     /* Initialize CPU registers.  */
 248     env->vbr = 0;
 249     /* TODO: Configure BARs.  */
 250
 251     /* ROM at 0x00000000 */
 252     memory_region_init_rom(rom, NULL, "mcf5208.rom", ROM_SIZE, &error_fatal);
 253     memory_region_add_subregion(address_space_mem, 0x00000000, rom);
 254
 255     /* DRAM at 0x40000000 */
 256     memory_region_add_subregion(address_space_mem, 0x40000000, machine->ram);
 257
 258     /* Internal SRAM.  */
 259     memory_region_init_ram(sram, NULL, "mcf5208.sram", 16 * KiB, &error_fatal);
 260     memory_region_add_subregion(address_space_mem, 0x80000000, sram);
 261
 262     /* Internal peripherals.  */
 263     pic = mcf_intc_init(address_space_mem, 0xfc048000, cpu);
 264
 265     mcf_uart_mm_init(0xfc060000, pic[26], serial_hd(0));
 266     mcf_uart_mm_init(0xfc064000, pic[27], serial_hd(1));
 267     mcf_uart_mm_init(0xfc068000, pic[28], serial_hd(2));
 268
 269     mcf5208_sys_init(address_space_mem, pic);
 270
 271     if (nb_nics > 1) {
 272         error_report("Too many NICs");
 273         exit(1);
 274     }
 275     if (nd_table[0].used) {
 276         mcf_fec_init(address_space_mem, &nd_table[0],
 277                      0xfc030000, pic + 36);
 278     }
 279
 280     g_free(pic);
 281
 282     /*  0xfc000000 SCM.  */
 283     /*  0xfc004000 XBS.  */
 284     /*  0xfc008000 FlexBus CS.  */
 285     /* 0xfc030000 FEC.  */
 286     /*  0xfc040000 SCM + Power management.  */
 287     /*  0xfc044000 eDMA.  */
 288     /* 0xfc048000 INTC.  */
 289     /*  0xfc058000 I2C.  */
 290     /*  0xfc05c000 QSPI.  */
 291     /* 0xfc060000 UART0.  */
 292     /* 0xfc064000 UART0.  */
 293     /* 0xfc068000 UART0.  */
 294     /*  0xfc070000 DMA timers.  */
 295     /* 0xfc080000 PIT0.  */
 296     /* 0xfc084000 PIT1.  */
 297     /*  0xfc088000 EPORT.  */
 298     /*  0xfc08c000 Watchdog.  */
 299     /*  0xfc090000 clock module.  */
 300     /*  0xfc0a0000 CCM + reset.  */
 301     /*  0xfc0a4000 GPIO.  */
 302     /* 0xfc0a8000 SDRAM controller.  */
 303
 304     /* Load firmware */
 305     if (machine->firmware) {
 306         char *fn;
 307         uint8_t *ptr;
 308
 309         fn = qemu_find_file(QEMU_FILE_TYPE_BIOS, machine->firmware);
 310         if (!fn) {
 311             error_report("Could not find ROM image '%s'", machine->firmware);
 312             exit(1);
 313         }
 314         if (load_image_targphys(fn, 0x0, ROM_SIZE) < 8) {
 315             error_report("Could not load ROM image '%s'", machine->firmware);
 316             exit(1);
 317         }
 318         g_free(fn);
 319         /* Initial PC is always at offset 4 in firmware binaries */
 320         ptr = rom_ptr(0x4, 4);
 321         assert(ptr != NULL);
 322         env->pc = ldl_p(ptr);
 323     }
 324
 325     /* Load kernel.  */
 326     if (!kernel_filename) {
 327         if (qtest_enabled() || machine->firmware) {
 328             return;
 329         }
 330         error_report("Kernel image must be specified");
 331         exit(1);
 332     }
 333
 334     kernel_size = load_elf(kernel_filename, NULL, NULL, NULL, &elf_entry,
 335                            NULL, NULL, NULL, 1, EM_68K, 0, 0);
 336     entry = elf_entry;
 337     if (kernel_size < 0) {
 338         kernel_size = load_uimage(kernel_filename, &entry, NULL, NULL,
 339                                   NULL, NULL);
 340     }
 341     if (kernel_size < 0) {
 342         kernel_size = load_image_targphys(kernel_filename, 0x40000000,
 343                                           ram_size);
 344         entry = 0x40000000;
 345     }
 346     if (kernel_size < 0) {
 347         error_report("Could not load kernel '%s'", kernel_filename);
 348         exit(1);
 349     }
 350
 351     env->pc = entry;
 352 }
 353
 354 static void mcf5208evb_machine_init(MachineClass *mc)
 355 {
 356     mc->desc = "MCF5208EVB";
 357     mc->init = mcf5208evb_init;
 358     mc->is_default = true;
 359     mc->default_cpu_type = M68K_CPU_TYPE_NAME("m5208");
 360     mc->default_ram_id = "mcf5208.ram";
 361 }
 362
 363 DEFINE_MACHINE("mcf5208evb", mcf5208evb_machine_init)