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