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 "hw.h"
   9 #include "mcf.h"
  10 #include "qemu-timer.h"
  11 #include "sysemu.h"
  12 #include "net.h"
  13 #include "boards.h"
  14
  15 #define SYS_FREQ 66000000
  16
  17 #define PCSR_EN         0x0001
  18 #define PCSR_RLD        0x0002
  19 #define PCSR_PIF        0x0004
  20 #define PCSR_PIE        0x0008
  21 #define PCSR_OVW        0x0010
  22 #define PCSR_DBG        0x0020
  23 #define PCSR_DOZE       0x0040
  24 #define PCSR_PRE_SHIFT  8
  25 #define PCSR_PRE_MASK   0x0f00
  26
  27 typedef struct {
  28     qemu_irq irq;
  29     ptimer_state *timer;
  30     uint16_t pcsr;
  31     uint16_t pmr;
  32     uint16_t pcntr;
  33 } m5208_timer_state;
  34
  35 static void m5208_timer_update(m5208_timer_state *s)
  36 {
  37     if ((s->pcsr & (PCSR_PIE | PCSR_PIF)) == (PCSR_PIE | PCSR_PIF))
  38         qemu_irq_raise(s->irq);
  39     else
  40         qemu_irq_lower(s->irq);
  41 }
  42
  43 static void m5208_timer_write(m5208_timer_state *s, int offset,
  44                               uint32_t value)
  45 {
  46     int prescale;
  47     int limit;
  48     switch (offset) {
  49     case 0:
  50         /* The PIF bit is set-to-clear.  */
  51         if (value & PCSR_PIF) {
  52             s->pcsr &= ~PCSR_PIF;
  53             value &= ~PCSR_PIF;
  54         }
  55         /* Avoid frobbing the timer if we're just twiddling IRQ bits. */
  56         if (((s->pcsr ^ value) & ~PCSR_PIE) == 0) {
  57             s->pcsr = value;
  58             m5208_timer_update(s);
  59             return;
  60         }
  61
  62         if (s->pcsr & PCSR_EN)
  63             ptimer_stop(s->timer);
  64
  65         s->pcsr = value;
  66
  67         prescale = 1 << ((s->pcsr & PCSR_PRE_MASK) >> PCSR_PRE_SHIFT);
  68         ptimer_set_freq(s->timer, (SYS_FREQ / 2) / prescale);
  69         if (s->pcsr & PCSR_RLD)
  70             limit = s->pmr;
  71         else
  72             limit = 0xffff;
  73         ptimer_set_limit(s->timer, limit, 0);
  74
  75         if (s->pcsr & PCSR_EN)
  76             ptimer_run(s->timer, 0);
  77         break;
  78     case 2:
  79         s->pmr = value;
  80         s->pcsr &= ~PCSR_PIF;
  81         if ((s->pcsr & PCSR_RLD) == 0) {
  82             if (s->pcsr & PCSR_OVW)
  83                 ptimer_set_count(s->timer, value);
  84         } else {
  85             ptimer_set_limit(s->timer, value, s->pcsr & PCSR_OVW);
  86         }
  87         break;
  88     case 4:
  89         break;
  90     default:
  91         /* Should never happen.  */
  92         abort();
  93     }
  94     m5208_timer_update(s);
  95 }
  96
  97 static void m5208_timer_trigger(void *opaque)
  98 {
  99     m5208_timer_state *s = (m5208_timer_state *)opaque;
 100     s->pcsr |= PCSR_PIF;
 101     m5208_timer_update(s);
 102 }
 103
 104 typedef struct {
 105     m5208_timer_state timer[2];
 106 } m5208_sys_state;
 107
 108 static uint32_t m5208_sys_read(void *opaque, target_phys_addr_t addr)
 109 {
 110     m5208_sys_state *s = (m5208_sys_state *)opaque;
 111     switch (addr) {
 112     /* PIT0 */
 113     case 0xfc080000:
 114         return s->timer[0].pcsr;
 115     case 0xfc080002:
 116         return s->timer[0].pmr;
 117     case 0xfc080004:
 118         return ptimer_get_count(s->timer[0].timer);
 119     /* PIT1 */
 120     case 0xfc084000:
 121         return s->timer[1].pcsr;
 122     case 0xfc084002:
 123         return s->timer[1].pmr;
 124     case 0xfc084004:
 125         return ptimer_get_count(s->timer[1].timer);
 126
 127     /* SDRAM Controller.  */
 128     case 0xfc0a8110: /* SDCS0 */
 129         {
 130             int n;
 131             for (n = 0; n < 32; n++) {
 132                 if (ram_size < (2u << n))
 133                     break;
 134             }
 135             return (n - 1)  | 0x40000000;
 136         }
 137     case 0xfc0a8114: /* SDCS1 */
 138         return 0;
 139
 140     default:
 141         cpu_abort(cpu_single_env, "m5208_sys_read: Bad offset 0x%x\n",
 142                   (int)addr);
 143         return 0;
 144     }
 145 }
 146
 147 static void m5208_sys_write(void *opaque, target_phys_addr_t addr,
 148                             uint32_t value)
 149 {
 150     m5208_sys_state *s = (m5208_sys_state *)opaque;
 151     switch (addr) {
 152     /* PIT0 */
 153     case 0xfc080000:
 154     case 0xfc080002:
 155     case 0xfc080004:
 156         m5208_timer_write(&s->timer[0], addr & 0xf, value);
 157         return;
 158     /* PIT1 */
 159     case 0xfc084000:
 160     case 0xfc084002:
 161     case 0xfc084004:
 162         m5208_timer_write(&s->timer[1], addr & 0xf, value);
 163         return;
 164     default:
 165         cpu_abort(cpu_single_env, "m5208_sys_write: Bad offset 0x%x\n",
 166                   (int)addr);
 167         break;
 168     }
 169 }
 170
 171 static CPUReadMemoryFunc *m5208_sys_readfn[] = {
 172    m5208_sys_read,
 173    m5208_sys_read,
 174    m5208_sys_read
 175 };
 176
 177 static CPUWriteMemoryFunc *m5208_sys_writefn[] = {
 178    m5208_sys_write,
 179    m5208_sys_write,
 180    m5208_sys_write
 181 };
 182
 183 static void mcf5208_sys_init(qemu_irq *pic)
 184 {
 185     int iomemtype;
 186     m5208_sys_state *s;
 187     QEMUBH *bh;
 188     int i;
 189
 190     s = (m5208_sys_state *)qemu_mallocz(sizeof(m5208_sys_state));
 191     iomemtype = cpu_register_io_memory(0, m5208_sys_readfn,
 192                                        m5208_sys_writefn, s);
 193     /* SDRAMC.  */
 194     cpu_register_physical_memory(0xfc0a8000, 0x00004000, iomemtype);
 195     /* Timers.  */
 196     for (i = 0; i < 2; i++) {
 197         bh = qemu_bh_new(m5208_timer_trigger, &s->timer[i]);
 198         s->timer[i].timer = ptimer_init(bh);
 199         cpu_register_physical_memory(0xfc080000 + 0x4000 * i, 0x00004000,
 200                                      iomemtype);
 201         s->timer[i].irq = pic[4 + i];
 202     }
 203 }
 204
 205 static void mcf5208evb_init(int ram_size, int vga_ram_size,
 206                      const char *boot_device, DisplayState *ds,
 207                      const char *kernel_filename, const char *kernel_cmdline,
 208                      const char *initrd_filename, const char *cpu_model)
 209 {
 210     CPUState *env;
 211     int kernel_size;
 212     uint64_t elf_entry;
 213     target_ulong entry;
 214     qemu_irq *pic;
 215
 216     if (!cpu_model)
 217         cpu_model = "m5208";
 218     env = cpu_init(cpu_model);
 219     if (!env) {
 220         fprintf(stderr, "Unable to find m68k CPU definition\n");
 221         exit(1);
 222     }
 223
 224     /* Initialize CPU registers.  */
 225     env->vbr = 0;
 226     /* TODO: Configure BARs.  */
 227
 228     /* DRAM at 0x20000000 */
 229     cpu_register_physical_memory(0x40000000, ram_size,
 230         qemu_ram_alloc(ram_size) | IO_MEM_RAM);
 231
 232     /* Internal SRAM.  */
 233     cpu_register_physical_memory(0x80000000, 16384,
 234         qemu_ram_alloc(16384) | IO_MEM_RAM);
 235
 236     /* Internal peripherals.  */
 237     pic = mcf_intc_init(0xfc048000, env);
 238
 239     mcf_uart_mm_init(0xfc060000, pic[26], serial_hds[0]);
 240     mcf_uart_mm_init(0xfc064000, pic[27], serial_hds[1]);
 241     mcf_uart_mm_init(0xfc068000, pic[28], serial_hds[2]);
 242
 243     mcf5208_sys_init(pic);
 244
 245     if (nb_nics > 1) {
 246         fprintf(stderr, "Too many NICs\n");
 247         exit(1);
 248     }
 249     if (nd_table[0].vlan) {
 250         if (nd_table[0].model == NULL
 251             || strcmp(nd_table[0].model, "mcf_fec") == 0) {
 252             mcf_fec_init(&nd_table[0], 0xfc030000, pic + 36);
 253         } else if (strcmp(nd_table[0].model, "?") == 0) {
 254             fprintf(stderr, "qemu: Supported NICs: mcf_fec\n");
 255             exit (1);
 256         } else {
 257             fprintf(stderr, "qemu: Unsupported NIC: %s\n", nd_table[0].model);
 258             exit (1);
 259         }
 260     }
 261
 262     /*  0xfc000000 SCM.  */
 263     /*  0xfc004000 XBS.  */
 264     /*  0xfc008000 FlexBus CS.  */
 265     /* 0xfc030000 FEC.  */
 266     /*  0xfc040000 SCM + Power management.  */
 267     /*  0xfc044000 eDMA.  */
 268     /* 0xfc048000 INTC.  */
 269     /*  0xfc058000 I2C.  */
 270     /*  0xfc05c000 QSPI.  */
 271     /* 0xfc060000 UART0.  */
 272     /* 0xfc064000 UART0.  */
 273     /* 0xfc068000 UART0.  */
 274     /*  0xfc070000 DMA timers.  */
 275     /* 0xfc080000 PIT0.  */
 276     /* 0xfc084000 PIT1.  */
 277     /*  0xfc088000 EPORT.  */
 278     /*  0xfc08c000 Watchdog.  */
 279     /*  0xfc090000 clock module.  */
 280     /*  0xfc0a0000 CCM + reset.  */
 281     /*  0xfc0a4000 GPIO.  */
 282     /* 0xfc0a8000 SDRAM controller.  */
 283
 284     /* Load kernel.  */
 285     if (!kernel_filename) {
 286         fprintf(stderr, "Kernel image must be specified\n");
 287         exit(1);
 288     }
 289
 290     kernel_size = load_elf(kernel_filename, 0, &elf_entry, NULL, NULL);
 291     entry = elf_entry;
 292     if (kernel_size < 0) {
 293         kernel_size = load_uboot(kernel_filename, &entry, NULL);
 294     }
 295     if (kernel_size < 0) {
 296         kernel_size = load_image(kernel_filename, phys_ram_base);
 297         entry = 0x20000000;
 298     }
 299     if (kernel_size < 0) {
 300         fprintf(stderr, "qemu: could not load kernel '%s'\n", kernel_filename);
 301         exit(1);
 302     }
 303
 304     env->pc = entry;
 305 }
 306
 307 QEMUMachine mcf5208evb_machine = {
 308     "mcf5208evb",
 309     "MCF5206EVB",
 310     mcf5208evb_init,
 311 };