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 "qapi/error.h"
  13 #include "qemu-common.h"
  14 #include "cpu.h"
  15 #include "hw/hw.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 #include "exec/address-spaces.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         hw_error("m5208_timer_write: Bad offset 0x%x\n", (int)offset);
 115         break;
 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         hw_error("m5208_timer_read: Bad offset 0x%x\n", (int)addr);
 140         return 0;
 141     }
 142 }
 143
 144 static const MemoryRegionOps m5208_timer_ops = {
 145     .read = m5208_timer_read,
 146     .write = m5208_timer_write,
 147     .endianness = DEVICE_NATIVE_ENDIAN,
 148 };
 149
 150 static uint64_t m5208_sys_read(void *opaque, hwaddr addr,
 151                                unsigned size)
 152 {
 153     switch (addr) {
 154     case 0x110: /* SDCS0 */
 155         {
 156             int n;
 157             for (n = 0; n < 32; n++) {
 158                 if (ram_size < (2u << n))
 159                     break;
 160             }
 161             return (n - 1)  | 0x40000000;
 162         }
 163     case 0x114: /* SDCS1 */
 164         return 0;
 165
 166     default:
 167         hw_error("m5208_sys_read: Bad offset 0x%x\n", (int)addr);
 168         return 0;
 169     }
 170 }
 171
 172 static void m5208_sys_write(void *opaque, hwaddr addr,
 173                             uint64_t value, unsigned size)
 174 {
 175     hw_error("m5208_sys_write: Bad offset 0x%x\n", (int)addr);
 176 }
 177
 178 static const MemoryRegionOps m5208_sys_ops = {
 179     .read = m5208_sys_read,
 180     .write = m5208_sys_write,
 181     .endianness = DEVICE_NATIVE_ENDIAN,
 182 };
 183
 184 static void mcf5208_sys_init(MemoryRegion *address_space, qemu_irq *pic)
 185 {
 186     MemoryRegion *iomem = g_new(MemoryRegion, 1);
 187     m5208_timer_state *s;
 188     int i;
 189
 190     /* SDRAMC.  */
 191     memory_region_init_io(iomem, NULL, &m5208_sys_ops, NULL, "m5208-sys", 0x00004000);
 192     memory_region_add_subregion(address_space, 0xfc0a8000, iomem);
 193     /* Timers.  */
 194     for (i = 0; i < 2; i++) {
 195         s = g_new0(m5208_timer_state, 1);
 196         s->timer = ptimer_init(m5208_timer_trigger, s, PTIMER_POLICY_DEFAULT);
 197         memory_region_init_io(&s->iomem, NULL, &m5208_timer_ops, s,
 198                               "m5208-timer", 0x00004000);
 199         memory_region_add_subregion(address_space, 0xfc080000 + 0x4000 * i,
 200                                     &s->iomem);
 201         s->irq = pic[4 + i];
 202     }
 203 }
 204
 205 static void mcf_fec_init(MemoryRegion *sysmem, NICInfo *nd, hwaddr base,
 206                          qemu_irq *irqs)
 207 {
 208     DeviceState *dev;
 209     SysBusDevice *s;
 210     int i;
 211
 212     qemu_check_nic_model(nd, TYPE_MCF_FEC_NET);
 213     dev = qdev_create(NULL, TYPE_MCF_FEC_NET);
 214     qdev_set_nic_properties(dev, nd);
 215     qdev_init_nofail(dev);
 216
 217     s = SYS_BUS_DEVICE(dev);
 218     for (i = 0; i < FEC_NUM_IRQ; i++) {
 219         sysbus_connect_irq(s, i, irqs[i]);
 220     }
 221
 222     memory_region_add_subregion(sysmem, base, sysbus_mmio_get_region(s, 0));
 223 }
 224
 225 static void mcf5208evb_init(MachineState *machine)
 226 {
 227     ram_addr_t ram_size = machine->ram_size;
 228     const char *kernel_filename = machine->kernel_filename;
 229     M68kCPU *cpu;
 230     CPUM68KState *env;
 231     int kernel_size;
 232     uint64_t elf_entry;
 233     hwaddr entry;
 234     qemu_irq *pic;
 235     MemoryRegion *address_space_mem = get_system_memory();
 236     MemoryRegion *rom = g_new(MemoryRegion, 1);
 237     MemoryRegion *ram = g_new(MemoryRegion, 1);
 238     MemoryRegion *sram = g_new(MemoryRegion, 1);
 239
 240     cpu = M68K_CPU(cpu_create(machine->cpu_type));
 241     env = &cpu->env;
 242
 243     /* Initialize CPU registers.  */
 244     env->vbr = 0;
 245     /* TODO: Configure BARs.  */
 246
 247     /* ROM at 0x00000000 */
 248     memory_region_init_rom(rom, NULL, "mcf5208.rom", ROM_SIZE, &error_fatal);
 249     memory_region_add_subregion(address_space_mem, 0x00000000, rom);
 250
 251     /* DRAM at 0x40000000 */
 252     memory_region_allocate_system_memory(ram, NULL, "mcf5208.ram", ram_size);
 253     memory_region_add_subregion(address_space_mem, 0x40000000, ram);
 254
 255     /* Internal SRAM.  */
 256     memory_region_init_ram(sram, NULL, "mcf5208.sram", 16 * KiB, &error_fatal);
 257     memory_region_add_subregion(address_space_mem, 0x80000000, sram);
 258
 259     /* Internal peripherals.  */
 260     pic = mcf_intc_init(address_space_mem, 0xfc048000, cpu);
 261
 262     mcf_uart_mm_init(0xfc060000, pic[26], serial_hd(0));
 263     mcf_uart_mm_init(0xfc064000, pic[27], serial_hd(1));
 264     mcf_uart_mm_init(0xfc068000, pic[28], serial_hd(2));
 265
 266     mcf5208_sys_init(address_space_mem, pic);
 267
 268     if (nb_nics > 1) {
 269         error_report("Too many NICs");
 270         exit(1);
 271     }
 272     if (nd_table[0].used) {
 273         mcf_fec_init(address_space_mem, &nd_table[0],
 274                      0xfc030000, pic + 36);
 275     }
 276
 277     g_free(pic);
 278
 279     /*  0xfc000000 SCM.  */
 280     /*  0xfc004000 XBS.  */
 281     /*  0xfc008000 FlexBus CS.  */
 282     /* 0xfc030000 FEC.  */
 283     /*  0xfc040000 SCM + Power management.  */
 284     /*  0xfc044000 eDMA.  */
 285     /* 0xfc048000 INTC.  */
 286     /*  0xfc058000 I2C.  */
 287     /*  0xfc05c000 QSPI.  */
 288     /* 0xfc060000 UART0.  */
 289     /* 0xfc064000 UART0.  */
 290     /* 0xfc068000 UART0.  */
 291     /*  0xfc070000 DMA timers.  */
 292     /* 0xfc080000 PIT0.  */
 293     /* 0xfc084000 PIT1.  */
 294     /*  0xfc088000 EPORT.  */
 295     /*  0xfc08c000 Watchdog.  */
 296     /*  0xfc090000 clock module.  */
 297     /*  0xfc0a0000 CCM + reset.  */
 298     /*  0xfc0a4000 GPIO.  */
 299     /* 0xfc0a8000 SDRAM controller.  */
 300
 301     /* Load firmware */
 302     if (bios_name) {
 303         char *fn;
 304         uint8_t *ptr;
 305
 306         fn = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 307         if (!fn) {
 308             error_report("Could not find ROM image '%s'", bios_name);
 309             exit(1);
 310         }
 311         if (load_image_targphys(fn, 0x0, ROM_SIZE) < 8) {
 312             error_report("Could not load ROM image '%s'", bios_name);
 313             exit(1);
 314         }
 315         g_free(fn);
 316         /* Initial PC is always at offset 4 in firmware binaries */
 317         ptr = rom_ptr(0x4, 4);
 318         assert(ptr != NULL);
 319         env->pc = ldl_p(ptr);
 320     }
 321
 322     /* Load kernel.  */
 323     if (!kernel_filename) {
 324         if (qtest_enabled() || bios_name) {
 325             return;
 326         }
 327         error_report("Kernel image must be specified");
 328         exit(1);
 329     }
 330
 331     kernel_size = load_elf(kernel_filename, NULL, NULL, NULL, &elf_entry,
 332                            NULL, NULL, 1, EM_68K, 0, 0);
 333     entry = elf_entry;
 334     if (kernel_size < 0) {
 335         kernel_size = load_uimage(kernel_filename, &entry, NULL, NULL,
 336                                   NULL, NULL);
 337     }
 338     if (kernel_size < 0) {
 339         kernel_size = load_image_targphys(kernel_filename, 0x40000000,
 340                                           ram_size);
 341         entry = 0x40000000;
 342     }
 343     if (kernel_size < 0) {
 344         error_report("Could not load kernel '%s'", kernel_filename);
 345         exit(1);
 346     }
 347
 348     env->pc = entry;
 349 }
 350
 351 static void mcf5208evb_machine_init(MachineClass *mc)
 352 {
 353     mc->desc = "MCF5208EVB";
 354     mc->init = mcf5208evb_init;
 355     mc->is_default = 1;
 356     mc->default_cpu_type = M68K_CPU_TYPE_NAME("m5208");
 357 }
 358
 359 DEFINE_MACHINE("mcf5208evb", mcf5208evb_machine_init)