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 #include "hw/hw.h"
   9 #include "hw/m68k/mcf.h"
  10 #include "qemu/timer.h"
  11 #include "hw/ptimer.h"
  12 #include "sysemu/sysemu.h"
  13 #include "sysemu/qtest.h"
  14 #include "net/net.h"
  15 #include "hw/boards.h"
  16 #include "hw/loader.h"
  17 #include "elf.h"
  18 #include "exec/address-spaces.h"
  19
  20 #define SYS_FREQ 66000000
  21
  22 #define PCSR_EN         0x0001
  23 #define PCSR_RLD        0x0002
  24 #define PCSR_PIF        0x0004
  25 #define PCSR_PIE        0x0008
  26 #define PCSR_OVW        0x0010
  27 #define PCSR_DBG        0x0020
  28 #define PCSR_DOZE       0x0040
  29 #define PCSR_PRE_SHIFT  8
  30 #define PCSR_PRE_MASK   0x0f00
  31
  32 typedef struct {
  33     MemoryRegion iomem;
  34     qemu_irq irq;
  35     ptimer_state *timer;
  36     uint16_t pcsr;
  37     uint16_t pmr;
  38     uint16_t pcntr;
  39 } m5208_timer_state;
  40
  41 static void m5208_timer_update(m5208_timer_state *s)
  42 {
  43     if ((s->pcsr & (PCSR_PIE | PCSR_PIF)) == (PCSR_PIE | PCSR_PIF))
  44         qemu_irq_raise(s->irq);
  45     else
  46         qemu_irq_lower(s->irq);
  47 }
  48
  49 static void m5208_timer_write(void *opaque, hwaddr offset,
  50                               uint64_t value, unsigned size)
  51 {
  52     m5208_timer_state *s = (m5208_timer_state *)opaque;
  53     int prescale;
  54     int limit;
  55     switch (offset) {
  56     case 0:
  57         /* The PIF bit is set-to-clear.  */
  58         if (value & PCSR_PIF) {
  59             s->pcsr &= ~PCSR_PIF;
  60             value &= ~PCSR_PIF;
  61         }
  62         /* Avoid frobbing the timer if we're just twiddling IRQ bits. */
  63         if (((s->pcsr ^ value) & ~PCSR_PIE) == 0) {
  64             s->pcsr = value;
  65             m5208_timer_update(s);
  66             return;
  67         }
  68
  69         if (s->pcsr & PCSR_EN)
  70             ptimer_stop(s->timer);
  71
  72         s->pcsr = value;
  73
  74         prescale = 1 << ((s->pcsr & PCSR_PRE_MASK) >> PCSR_PRE_SHIFT);
  75         ptimer_set_freq(s->timer, (SYS_FREQ / 2) / prescale);
  76         if (s->pcsr & PCSR_RLD)
  77             limit = s->pmr;
  78         else
  79             limit = 0xffff;
  80         ptimer_set_limit(s->timer, limit, 0);
  81
  82         if (s->pcsr & PCSR_EN)
  83             ptimer_run(s->timer, 0);
  84         break;
  85     case 2:
  86         s->pmr = value;
  87         s->pcsr &= ~PCSR_PIF;
  88         if ((s->pcsr & PCSR_RLD) == 0) {
  89             if (s->pcsr & PCSR_OVW)
  90                 ptimer_set_count(s->timer, value);
  91         } else {
  92             ptimer_set_limit(s->timer, value, s->pcsr & PCSR_OVW);
  93         }
  94         break;
  95     case 4:
  96         break;
  97     default:
  98         hw_error("m5208_timer_write: Bad offset 0x%x\n", (int)offset);
  99         break;
 100     }
 101     m5208_timer_update(s);
 102 }
 103
 104 static void m5208_timer_trigger(void *opaque)
 105 {
 106     m5208_timer_state *s = (m5208_timer_state *)opaque;
 107     s->pcsr |= PCSR_PIF;
 108     m5208_timer_update(s);
 109 }
 110
 111 static uint64_t m5208_timer_read(void *opaque, hwaddr addr,
 112                                  unsigned size)
 113 {
 114     m5208_timer_state *s = (m5208_timer_state *)opaque;
 115     switch (addr) {
 116     case 0:
 117         return s->pcsr;
 118     case 2:
 119         return s->pmr;
 120     case 4:
 121         return ptimer_get_count(s->timer);
 122     default:
 123         hw_error("m5208_timer_read: Bad offset 0x%x\n", (int)addr);
 124         return 0;
 125     }
 126 }
 127
 128 static const MemoryRegionOps m5208_timer_ops = {
 129     .read = m5208_timer_read,
 130     .write = m5208_timer_write,
 131     .endianness = DEVICE_NATIVE_ENDIAN,
 132 };
 133
 134 static uint64_t m5208_sys_read(void *opaque, hwaddr addr,
 135                                unsigned size)
 136 {
 137     switch (addr) {
 138     case 0x110: /* SDCS0 */
 139         {
 140             int n;
 141             for (n = 0; n < 32; n++) {
 142                 if (ram_size < (2u << n))
 143                     break;
 144             }
 145             return (n - 1)  | 0x40000000;
 146         }
 147     case 0x114: /* SDCS1 */
 148         return 0;
 149
 150     default:
 151         hw_error("m5208_sys_read: Bad offset 0x%x\n", (int)addr);
 152         return 0;
 153     }
 154 }
 155
 156 static void m5208_sys_write(void *opaque, hwaddr addr,
 157                             uint64_t value, unsigned size)
 158 {
 159     hw_error("m5208_sys_write: Bad offset 0x%x\n", (int)addr);
 160 }
 161
 162 static const MemoryRegionOps m5208_sys_ops = {
 163     .read = m5208_sys_read,
 164     .write = m5208_sys_write,
 165     .endianness = DEVICE_NATIVE_ENDIAN,
 166 };
 167
 168 static void mcf5208_sys_init(MemoryRegion *address_space, qemu_irq *pic)
 169 {
 170     MemoryRegion *iomem = g_new(MemoryRegion, 1);
 171     m5208_timer_state *s;
 172     QEMUBH *bh;
 173     int i;
 174
 175     /* SDRAMC.  */
 176     memory_region_init_io(iomem, NULL, &m5208_sys_ops, NULL, "m5208-sys", 0x00004000);
 177     memory_region_add_subregion(address_space, 0xfc0a8000, iomem);
 178     /* Timers.  */
 179     for (i = 0; i < 2; i++) {
 180         s = (m5208_timer_state *)g_malloc0(sizeof(m5208_timer_state));
 181         bh = qemu_bh_new(m5208_timer_trigger, s);
 182         s->timer = ptimer_init(bh);
 183         memory_region_init_io(&s->iomem, NULL, &m5208_timer_ops, s,
 184                               "m5208-timer", 0x00004000);
 185         memory_region_add_subregion(address_space, 0xfc080000 + 0x4000 * i,
 186                                     &s->iomem);
 187         s->irq = pic[4 + i];
 188     }
 189 }
 190
 191 static void mcf5208evb_init(MachineState *machine)
 192 {
 193     ram_addr_t ram_size = machine->ram_size;
 194     const char *cpu_model = machine->cpu_model;
 195     const char *kernel_filename = machine->kernel_filename;
 196     M68kCPU *cpu;
 197     CPUM68KState *env;
 198     int kernel_size;
 199     uint64_t elf_entry;
 200     hwaddr entry;
 201     qemu_irq *pic;
 202     MemoryRegion *address_space_mem = get_system_memory();
 203     MemoryRegion *ram = g_new(MemoryRegion, 1);
 204     MemoryRegion *sram = g_new(MemoryRegion, 1);
 205
 206     if (!cpu_model) {
 207         cpu_model = "m5208";
 208     }
 209     cpu = cpu_m68k_init(cpu_model);
 210     if (!cpu) {
 211         fprintf(stderr, "Unable to find m68k CPU definition\n");
 212         exit(1);
 213     }
 214     env = &cpu->env;
 215
 216     /* Initialize CPU registers.  */
 217     env->vbr = 0;
 218     /* TODO: Configure BARs.  */
 219
 220     /* DRAM at 0x40000000 */
 221     memory_region_init_ram(ram, NULL, "mcf5208.ram", ram_size);
 222     vmstate_register_ram_global(ram);
 223     memory_region_add_subregion(address_space_mem, 0x40000000, ram);
 224
 225     /* Internal SRAM.  */
 226     memory_region_init_ram(sram, NULL, "mcf5208.sram", 16384);
 227     vmstate_register_ram_global(sram);
 228     memory_region_add_subregion(address_space_mem, 0x80000000, sram);
 229
 230     /* Internal peripherals.  */
 231     pic = mcf_intc_init(address_space_mem, 0xfc048000, cpu);
 232
 233     mcf_uart_mm_init(address_space_mem, 0xfc060000, pic[26], serial_hds[0]);
 234     mcf_uart_mm_init(address_space_mem, 0xfc064000, pic[27], serial_hds[1]);
 235     mcf_uart_mm_init(address_space_mem, 0xfc068000, pic[28], serial_hds[2]);
 236
 237     mcf5208_sys_init(address_space_mem, pic);
 238
 239     if (nb_nics > 1) {
 240         fprintf(stderr, "Too many NICs\n");
 241         exit(1);
 242     }
 243     if (nd_table[0].used)
 244         mcf_fec_init(address_space_mem, &nd_table[0],
 245                      0xfc030000, pic + 36);
 246
 247     /*  0xfc000000 SCM.  */
 248     /*  0xfc004000 XBS.  */
 249     /*  0xfc008000 FlexBus CS.  */
 250     /* 0xfc030000 FEC.  */
 251     /*  0xfc040000 SCM + Power management.  */
 252     /*  0xfc044000 eDMA.  */
 253     /* 0xfc048000 INTC.  */
 254     /*  0xfc058000 I2C.  */
 255     /*  0xfc05c000 QSPI.  */
 256     /* 0xfc060000 UART0.  */
 257     /* 0xfc064000 UART0.  */
 258     /* 0xfc068000 UART0.  */
 259     /*  0xfc070000 DMA timers.  */
 260     /* 0xfc080000 PIT0.  */
 261     /* 0xfc084000 PIT1.  */
 262     /*  0xfc088000 EPORT.  */
 263     /*  0xfc08c000 Watchdog.  */
 264     /*  0xfc090000 clock module.  */
 265     /*  0xfc0a0000 CCM + reset.  */
 266     /*  0xfc0a4000 GPIO.  */
 267     /* 0xfc0a8000 SDRAM controller.  */
 268
 269     /* Load kernel.  */
 270     if (!kernel_filename) {
 271         if (qtest_enabled()) {
 272             return;
 273         }
 274         fprintf(stderr, "Kernel image must be specified\n");
 275         exit(1);
 276     }
 277
 278     kernel_size = load_elf(kernel_filename, NULL, NULL, &elf_entry,
 279                            NULL, NULL, 1, ELF_MACHINE, 0);
 280     entry = elf_entry;
 281     if (kernel_size < 0) {
 282         kernel_size = load_uimage(kernel_filename, &entry, NULL, NULL);
 283     }
 284     if (kernel_size < 0) {
 285         kernel_size = load_image_targphys(kernel_filename, 0x40000000,
 286                                           ram_size);
 287         entry = 0x40000000;
 288     }
 289     if (kernel_size < 0) {
 290         fprintf(stderr, "qemu: could not load kernel '%s'\n", kernel_filename);
 291         exit(1);
 292     }
 293
 294     env->pc = entry;
 295 }
 296
 297 static QEMUMachine mcf5208evb_machine = {
 298     .name = "mcf5208evb",
 299     .desc = "MCF5206EVB",
 300     .init = mcf5208evb_init,
 301     .is_default = 1,
 302 };
 303
 304 static void mcf5208evb_machine_init(void)
 305 {
 306     qemu_register_machine(&mcf5208evb_machine);
 307 }
 308
 309 machine_init(mcf5208evb_machine_init);