hw/mcf5208.c

   1 /*
   2  * Motorola ColdFire MCF5208 SoC emulation.
   3  *
   4  * Copyright (c) 2007 CodeSourcery.
   5  *
   6  * This code is licenced under the GPL
   7  */
   8 #include "vl.h"
   9
  10 #define SYS_FREQ 66000000
  11
  12 #define PCSR_EN         0x0001
  13 #define PCSR_RLD        0x0002
  14 #define PCSR_PIF        0x0004
  15 #define PCSR_PIE        0x0008
  16 #define PCSR_OVW        0x0010
  17 #define PCSR_DBG        0x0020
  18 #define PCSR_DOZE       0x0040
  19 #define PCSR_PRE_SHIFT  8
  20 #define PCSR_PRE_MASK   0x0f00
  21
  22 typedef struct {
  23     qemu_irq irq;
  24     ptimer_state *timer;
  25     uint16_t pcsr;
  26     uint16_t pmr;
  27     uint16_t pcntr;
  28 } m5208_timer_state;
  29
  30 static void m5208_timer_update(m5208_timer_state *s)
  31 {
  32     if ((s->pcsr & (PCSR_PIE | PCSR_PIF)) == (PCSR_PIE | PCSR_PIF))
  33         qemu_irq_raise(s->irq);
  34     else
  35         qemu_irq_lower(s->irq);
  36 }
  37
  38 static void m5208_timer_write(m5208_timer_state *s, int offset,
  39                               uint32_t value)
  40 {
  41     int prescale;
  42     int limit;
  43     switch (offset) {
  44     case 0:
  45         /* The PIF bit is set-to-clear.  */
  46         if (value & PCSR_PIF) {
  47             s->pcsr &= ~PCSR_PIF;
  48             value &= ~PCSR_PIF;
  49         }
  50         /* Avoid frobbing the timer if we're just twiddling IRQ bits. */
  51         if (((s->pcsr ^ value) & ~PCSR_PIE) == 0) {
  52             s->pcsr = value;
  53             m5208_timer_update(s);
  54             return;
  55         }
  56
  57         if (s->pcsr & PCSR_EN)
  58             ptimer_stop(s->timer);
  59
  60         s->pcsr = value;
  61
  62         prescale = 1 << ((s->pcsr & PCSR_PRE_MASK) >> PCSR_PRE_SHIFT);
  63         ptimer_set_freq(s->timer, (SYS_FREQ / 2) / prescale);
  64         if (s->pcsr & PCSR_RLD)
  65             limit = s->pmr;
  66         else
  67             limit = 0xffff;
  68         ptimer_set_limit(s->timer, limit, 0);
  69
  70         if (s->pcsr & PCSR_EN)
  71             ptimer_run(s->timer, 0);
  72         break;
  73     case 2:
  74         s->pmr = value;
  75         s->pcsr &= ~PCSR_PIF;
  76         if ((s->pcsr & PCSR_RLD) == 0) {
  77             if (s->pcsr & PCSR_OVW)
  78                 ptimer_set_count(s->timer, value);
  79         } else {
  80             ptimer_set_limit(s->timer, value, s->pcsr & PCSR_OVW);
  81         }
  82         break;
  83     case 4:
  84         break;
  85     default:
  86         /* Should never happen.  */
  87         abort();
  88     }
  89     m5208_timer_update(s);
  90 }
  91
  92 static void m5208_timer_trigger(void *opaque)
  93 {
  94     m5208_timer_state *s = (m5208_timer_state *)opaque;
  95     s->pcsr |= PCSR_PIF;
  96     m5208_timer_update(s);
  97 }
  98
  99 typedef struct {
 100     m5208_timer_state timer[2];
 101 } m5208_sys_state;
 102
 103 static uint32_t m5208_sys_read(void *opaque, target_phys_addr_t addr)
 104 {
 105     m5208_sys_state *s = (m5208_sys_state *)opaque;
 106     switch (addr) {
 107     /* PIT0 */
 108     case 0xfc080000:
 109         return s->timer[0].pcsr;
 110     case 0xfc080002:
 111         return s->timer[0].pmr;
 112     case 0xfc080004:
 113         return ptimer_get_count(s->timer[0].timer);
 114     /* PIT1 */
 115     case 0xfc084000:
 116         return s->timer[1].pcsr;
 117     case 0xfc084002:
 118         return s->timer[1].pmr;
 119     case 0xfc084004:
 120         return ptimer_get_count(s->timer[1].timer);
 121
 122     /* SDRAM Controller.  */
 123     case 0xfc0a8110: /* SDCS0 */
 124         {
 125             int n;
 126             for (n = 0; n < 32; n++) {
 127                 if (ram_size < (2u << n))
 128                     break;
 129             }
 130             return (n - 1)  | 0x40000000;
 131         }
 132     case 0xfc0a8114: /* SDCS1 */
 133         return 0;
 134
 135     default:
 136         cpu_abort(cpu_single_env, "m5208_sys_read: Bad offset 0x%x\n",
 137                   (int)addr);
 138         return 0;
 139     }
 140 }
 141
 142 static void m5208_sys_write(void *opaque, target_phys_addr_t addr,
 143                             uint32_t value)
 144 {
 145     m5208_sys_state *s = (m5208_sys_state *)opaque;
 146     switch (addr) {
 147     /* PIT0 */
 148     case 0xfc080000:
 149     case 0xfc080002:
 150     case 0xfc080004:
 151         m5208_timer_write(&s->timer[0], addr & 0xf, value);
 152         return;
 153     /* PIT1 */
 154     case 0xfc084000:
 155     case 0xfc084002:
 156     case 0xfc084004:
 157         m5208_timer_write(&s->timer[1], addr & 0xf, value);
 158         return;
 159     default:
 160         cpu_abort(cpu_single_env, "m5208_sys_write: Bad offset 0x%x\n",
 161                   (int)addr);
 162         break;
 163     }
 164 }
 165
 166 static CPUReadMemoryFunc *m5208_sys_readfn[] = {
 167    m5208_sys_read,
 168    m5208_sys_read,
 169    m5208_sys_read
 170 };
 171
 172 static CPUWriteMemoryFunc *m5208_sys_writefn[] = {
 173    m5208_sys_write,
 174    m5208_sys_write,
 175    m5208_sys_write
 176 };
 177
 178 static void mcf5208_sys_init(qemu_irq *pic)
 179 {
 180     int iomemtype;
 181     m5208_sys_state *s;
 182     QEMUBH *bh;
 183     int i;
 184
 185     s = (m5208_sys_state *)qemu_mallocz(sizeof(m5208_sys_state));
 186     iomemtype = cpu_register_io_memory(0, m5208_sys_readfn,
 187                                        m5208_sys_writefn, s);
 188     /* SDRAMC.  */
 189     cpu_register_physical_memory(0xfc0a8000, 0x00004000, iomemtype);
 190     /* Timers.  */
 191     for (i = 0; i < 2; i++) {
 192         bh = qemu_bh_new(m5208_timer_trigger, &s->timer[i]);
 193         s->timer[i].timer = ptimer_init(bh);
 194         cpu_register_physical_memory(0xfc080000 + 0x4000 * i, 0x00004000,
 195                                      iomemtype);
 196         s->timer[i].irq = pic[4 + i];
 197     }
 198 }
 199
 200 static void mcf5208evb_init(int ram_size, int vga_ram_size,
 201                      const char *boot_device, DisplayState *ds,
 202                      const char **fd_filename, int snapshot,
 203                      const char *kernel_filename, const char *kernel_cmdline,
 204                      const char *initrd_filename, const char *cpu_model)
 205 {
 206     CPUState *env;
 207     int kernel_size;
 208     uint64_t elf_entry;
 209     target_ulong entry;
 210     qemu_irq *pic;
 211
 212     if (!cpu_model)
 213         cpu_model = "m5208";
 214     env = cpu_init(cpu_model);
 215     if (!env) {
 216         fprintf(stderr, "Unable to find m68k CPU definition\n");
 217         exit(1);
 218     }
 219
 220     /* Initialize CPU registers.  */
 221     env->vbr = 0;
 222     /* TODO: Configure BARs.  */
 223
 224     /* DRAM at 0x20000000 */
 225     cpu_register_physical_memory(0x40000000, ram_size,
 226         qemu_ram_alloc(ram_size) | IO_MEM_RAM);
 227
 228     /* Internal SRAM.  */
 229     cpu_register_physical_memory(0x80000000, 16384,
 230         qemu_ram_alloc(16384) | IO_MEM_RAM);
 231
 232     /* Internal peripherals.  */
 233     pic = mcf_intc_init(0xfc048000, env);
 234
 235     mcf_uart_mm_init(0xfc060000, pic[26], serial_hds[0]);
 236     mcf_uart_mm_init(0xfc064000, pic[27], serial_hds[1]);
 237     mcf_uart_mm_init(0xfc068000, pic[28], serial_hds[2]);
 238
 239     mcf5208_sys_init(pic);
 240
 241     if (nb_nics > 1) {
 242         fprintf(stderr, "Too many NICs\n");
 243         exit(1);
 244     }
 245     if (nd_table[0].vlan) {
 246         if (nd_table[0].model == NULL
 247             || strcmp(nd_table[0].model, "mcf_fec") == 0) {
 248             mcf_fec_init(&nd_table[0], 0xfc030000, pic + 36);
 249         } else if (strcmp(nd_table[0].model, "?") == 0) {
 250             fprintf(stderr, "qemu: Supported NICs: mcf_fec\n");
 251             exit (1);
 252         } else {
 253             fprintf(stderr, "qemu: Unsupported NIC: %s\n", nd_table[0].model);
 254             exit (1);
 255         }
 256     }
 257
 258     /*  0xfc000000 SCM.  */
 259     /*  0xfc004000 XBS.  */
 260     /*  0xfc008000 FlexBus CS.  */
 261     /* 0xfc030000 FEC.  */
 262     /*  0xfc040000 SCM + Power management.  */
 263     /*  0xfc044000 eDMA.  */
 264     /* 0xfc048000 INTC.  */
 265     /*  0xfc058000 I2C.  */
 266     /*  0xfc05c000 QSPI.  */
 267     /* 0xfc060000 UART0.  */
 268     /* 0xfc064000 UART0.  */
 269     /* 0xfc068000 UART0.  */
 270     /*  0xfc070000 DMA timers.  */
 271     /* 0xfc080000 PIT0.  */
 272     /* 0xfc084000 PIT1.  */
 273     /*  0xfc088000 EPORT.  */
 274     /*  0xfc08c000 Watchdog.  */
 275     /*  0xfc090000 clock module.  */
 276     /*  0xfc0a0000 CCM + reset.  */
 277     /*  0xfc0a4000 GPIO.  */
 278     /* 0xfc0a8000 SDRAM controller.  */
 279
 280     /* Load kernel.  */
 281     if (!kernel_filename) {
 282         fprintf(stderr, "Kernel image must be specified\n");
 283         exit(1);
 284     }
 285
 286     kernel_size = load_elf(kernel_filename, 0, &elf_entry, NULL, NULL);
 287     entry = elf_entry;
 288     if (kernel_size < 0) {
 289         kernel_size = load_uboot(kernel_filename, &entry, NULL);
 290     }
 291     if (kernel_size < 0) {
 292         kernel_size = load_image(kernel_filename, phys_ram_base);
 293         entry = 0x20000000;
 294     }
 295     if (kernel_size < 0) {
 296         fprintf(stderr, "qemu: could not load kernel '%s'\n", kernel_filename);
 297         exit(1);
 298     }
 299
 300     env->pc = entry;
 301 }
 302
 303 QEMUMachine mcf5208evb_machine = {
 304     "mcf5208evb",
 305     "MCF5206EVB",
 306     mcf5208evb_init,
 307 };