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