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 "qemu/osdep.h"
   9 #include "qapi/error.h"
  10 #include "qemu-common.h"
  11 #include "cpu.h"
  12 #include "hw/hw.h"
  13 #include "hw/m68k/mcf.h"
  14 #include "qemu/timer.h"
  15 #include "hw/ptimer.h"
  16 #include "sysemu/sysemu.h"
  17 #include "sysemu/qtest.h"
  18 #include "net/net.h"
  19 #include "hw/boards.h"
  20 #include "hw/loader.h"
  21 #include "elf.h"
  22 #include "exec/address-spaces.h"
  23
  24 #define SYS_FREQ 166666666
  25
  26 #define PCSR_EN         0x0001
  27 #define PCSR_RLD        0x0002
  28 #define PCSR_PIF        0x0004
  29 #define PCSR_PIE        0x0008
  30 #define PCSR_OVW        0x0010
  31 #define PCSR_DBG        0x0020
  32 #define PCSR_DOZE       0x0040
  33 #define PCSR_PRE_SHIFT  8
  34 #define PCSR_PRE_MASK   0x0f00
  35
  36 typedef struct {
  37     MemoryRegion iomem;
  38     qemu_irq irq;
  39     ptimer_state *timer;
  40     uint16_t pcsr;
  41     uint16_t pmr;
  42     uint16_t pcntr;
  43 } m5208_timer_state;
  44
  45 static void m5208_timer_update(m5208_timer_state *s)
  46 {
  47     if ((s->pcsr & (PCSR_PIE | PCSR_PIF)) == (PCSR_PIE | PCSR_PIF))
  48         qemu_irq_raise(s->irq);
  49     else
  50         qemu_irq_lower(s->irq);
  51 }
  52
  53 static void m5208_timer_write(void *opaque, hwaddr offset,
  54                               uint64_t value, unsigned size)
  55 {
  56     m5208_timer_state *s = (m5208_timer_state *)opaque;
  57     int prescale;
  58     int limit;
  59     switch (offset) {
  60     case 0:
  61         /* The PIF bit is set-to-clear.  */
  62         if (value & PCSR_PIF) {
  63             s->pcsr &= ~PCSR_PIF;
  64             value &= ~PCSR_PIF;
  65         }
  66         /* Avoid frobbing the timer if we're just twiddling IRQ bits. */
  67         if (((s->pcsr ^ value) & ~PCSR_PIE) == 0) {
  68             s->pcsr = value;
  69             m5208_timer_update(s);
  70             return;
  71         }
  72
  73         if (s->pcsr & PCSR_EN)
  74             ptimer_stop(s->timer);
  75
  76         s->pcsr = value;
  77
  78         prescale = 1 << ((s->pcsr & PCSR_PRE_MASK) >> PCSR_PRE_SHIFT);
  79         ptimer_set_freq(s->timer, (SYS_FREQ / 2) / prescale);
  80         if (s->pcsr & PCSR_RLD)
  81             limit = s->pmr;
  82         else
  83             limit = 0xffff;
  84         ptimer_set_limit(s->timer, limit, 0);
  85
  86         if (s->pcsr & PCSR_EN)
  87             ptimer_run(s->timer, 0);
  88         break;
  89     case 2:
  90         s->pmr = value;
  91         s->pcsr &= ~PCSR_PIF;
  92         if ((s->pcsr & PCSR_RLD) == 0) {
  93             if (s->pcsr & PCSR_OVW)
  94                 ptimer_set_count(s->timer, value);
  95         } else {
  96             ptimer_set_limit(s->timer, value, s->pcsr & PCSR_OVW);
  97         }
  98         break;
  99     case 4:
 100         break;
 101     default:
 102         hw_error("m5208_timer_write: Bad offset 0x%x\n", (int)offset);
 103         break;
 104     }
 105     m5208_timer_update(s);
 106 }
 107
 108 static void m5208_timer_trigger(void *opaque)
 109 {
 110     m5208_timer_state *s = (m5208_timer_state *)opaque;
 111     s->pcsr |= PCSR_PIF;
 112     m5208_timer_update(s);
 113 }
 114
 115 static uint64_t m5208_timer_read(void *opaque, hwaddr addr,
 116                                  unsigned size)
 117 {
 118     m5208_timer_state *s = (m5208_timer_state *)opaque;
 119     switch (addr) {
 120     case 0:
 121         return s->pcsr;
 122     case 2:
 123         return s->pmr;
 124     case 4:
 125         return ptimer_get_count(s->timer);
 126     default:
 127         hw_error("m5208_timer_read: Bad offset 0x%x\n", (int)addr);
 128         return 0;
 129     }
 130 }
 131
 132 static const MemoryRegionOps m5208_timer_ops = {
 133     .read = m5208_timer_read,
 134     .write = m5208_timer_write,
 135     .endianness = DEVICE_NATIVE_ENDIAN,
 136 };
 137
 138 static uint64_t m5208_sys_read(void *opaque, hwaddr addr,
 139                                unsigned size)
 140 {
 141     switch (addr) {
 142     case 0x110: /* SDCS0 */
 143         {
 144             int n;
 145             for (n = 0; n < 32; n++) {
 146                 if (ram_size < (2u << n))
 147                     break;
 148             }
 149             return (n - 1)  | 0x40000000;
 150         }
 151     case 0x114: /* SDCS1 */
 152         return 0;
 153
 154     default:
 155         hw_error("m5208_sys_read: Bad offset 0x%x\n", (int)addr);
 156         return 0;
 157     }
 158 }
 159
 160 static void m5208_sys_write(void *opaque, hwaddr addr,
 161                             uint64_t value, unsigned size)
 162 {
 163     hw_error("m5208_sys_write: Bad offset 0x%x\n", (int)addr);
 164 }
 165
 166 static const MemoryRegionOps m5208_sys_ops = {
 167     .read = m5208_sys_read,
 168     .write = m5208_sys_write,
 169     .endianness = DEVICE_NATIVE_ENDIAN,
 170 };
 171
 172 static void mcf5208_sys_init(MemoryRegion *address_space, qemu_irq *pic)
 173 {
 174     MemoryRegion *iomem = g_new(MemoryRegion, 1);
 175     m5208_timer_state *s;
 176     QEMUBH *bh;
 177     int i;
 178
 179     /* SDRAMC.  */
 180     memory_region_init_io(iomem, NULL, &m5208_sys_ops, NULL, "m5208-sys", 0x00004000);
 181     memory_region_add_subregion(address_space, 0xfc0a8000, iomem);
 182     /* Timers.  */
 183     for (i = 0; i < 2; i++) {
 184         s = (m5208_timer_state *)g_malloc0(sizeof(m5208_timer_state));
 185         bh = qemu_bh_new(m5208_timer_trigger, s);
 186         s->timer = ptimer_init(bh, PTIMER_POLICY_DEFAULT);
 187         memory_region_init_io(&s->iomem, NULL, &m5208_timer_ops, s,
 188                               "m5208-timer", 0x00004000);
 189         memory_region_add_subregion(address_space, 0xfc080000 + 0x4000 * i,
 190                                     &s->iomem);
 191         s->irq = pic[4 + i];
 192     }
 193 }
 194
 195 static void mcf5208evb_init(MachineState *machine)
 196 {
 197     ram_addr_t ram_size = machine->ram_size;
 198     const char *cpu_model = machine->cpu_model;
 199     const char *kernel_filename = machine->kernel_filename;
 200     M68kCPU *cpu;
 201     CPUM68KState *env;
 202     int kernel_size;
 203     uint64_t elf_entry;
 204     hwaddr entry;
 205     qemu_irq *pic;
 206     MemoryRegion *address_space_mem = get_system_memory();
 207     MemoryRegion *ram = g_new(MemoryRegion, 1);
 208     MemoryRegion *sram = g_new(MemoryRegion, 1);
 209
 210     if (!cpu_model) {
 211         cpu_model = "m5208";
 212     }
 213     cpu = cpu_m68k_init(cpu_model);
 214     if (!cpu) {
 215         fprintf(stderr, "Unable to find m68k CPU definition\n");
 216         exit(1);
 217     }
 218     env = &cpu->env;
 219
 220     /* Initialize CPU registers.  */
 221     env->vbr = 0;
 222     /* TODO: Configure BARs.  */
 223
 224     /* DRAM at 0x40000000 */
 225     memory_region_allocate_system_memory(ram, NULL, "mcf5208.ram", ram_size);
 226     memory_region_add_subregion(address_space_mem, 0x40000000, ram);
 227
 228     /* Internal SRAM.  */
 229     memory_region_init_ram(sram, NULL, "mcf5208.sram", 16384, &error_fatal);
 230     vmstate_register_ram_global(sram);
 231     memory_region_add_subregion(address_space_mem, 0x80000000, sram);
 232
 233     /* Internal peripherals.  */
 234     pic = mcf_intc_init(address_space_mem, 0xfc048000, cpu);
 235
 236     mcf_uart_mm_init(address_space_mem, 0xfc060000, pic[26], serial_hds[0]);
 237     mcf_uart_mm_init(address_space_mem, 0xfc064000, pic[27], serial_hds[1]);
 238     mcf_uart_mm_init(address_space_mem, 0xfc068000, pic[28], serial_hds[2]);
 239
 240     mcf5208_sys_init(address_space_mem, pic);
 241
 242     if (nb_nics > 1) {
 243         fprintf(stderr, "Too many NICs\n");
 244         exit(1);
 245     }
 246     if (nd_table[0].used)
 247         mcf_fec_init(address_space_mem, &nd_table[0],
 248                      0xfc030000, pic + 36);
 249
 250     /*  0xfc000000 SCM.  */
 251     /*  0xfc004000 XBS.  */
 252     /*  0xfc008000 FlexBus CS.  */
 253     /* 0xfc030000 FEC.  */
 254     /*  0xfc040000 SCM + Power management.  */
 255     /*  0xfc044000 eDMA.  */
 256     /* 0xfc048000 INTC.  */
 257     /*  0xfc058000 I2C.  */
 258     /*  0xfc05c000 QSPI.  */
 259     /* 0xfc060000 UART0.  */
 260     /* 0xfc064000 UART0.  */
 261     /* 0xfc068000 UART0.  */
 262     /*  0xfc070000 DMA timers.  */
 263     /* 0xfc080000 PIT0.  */
 264     /* 0xfc084000 PIT1.  */
 265     /*  0xfc088000 EPORT.  */
 266     /*  0xfc08c000 Watchdog.  */
 267     /*  0xfc090000 clock module.  */
 268     /*  0xfc0a0000 CCM + reset.  */
 269     /*  0xfc0a4000 GPIO.  */
 270     /* 0xfc0a8000 SDRAM controller.  */
 271
 272     /* Load kernel.  */
 273     if (!kernel_filename) {
 274         if (qtest_enabled()) {
 275             return;
 276         }
 277         fprintf(stderr, "Kernel image must be specified\n");
 278         exit(1);
 279     }
 280
 281     kernel_size = load_elf(kernel_filename, NULL, NULL, &elf_entry,
 282                            NULL, NULL, 1, EM_68K, 0, 0);
 283     entry = elf_entry;
 284     if (kernel_size < 0) {
 285         kernel_size = load_uimage(kernel_filename, &entry, NULL, NULL,
 286                                   NULL, NULL);
 287     }
 288     if (kernel_size < 0) {
 289         kernel_size = load_image_targphys(kernel_filename, 0x40000000,
 290                                           ram_size);
 291         entry = 0x40000000;
 292     }
 293     if (kernel_size < 0) {
 294         fprintf(stderr, "qemu: could not load kernel '%s'\n", kernel_filename);
 295         exit(1);
 296     }
 297
 298     env->pc = entry;
 299 }
 300
 301 static void mcf5208evb_machine_init(MachineClass *mc)
 302 {
 303     mc->desc = "MCF5206EVB";
 304     mc->init = mcf5208evb_init;
 305     mc->is_default = 1;
 306 }
 307
 308 DEFINE_MACHINE("mcf5208evb", mcf5208evb_machine_init)