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(void *opaque, target_phys_addr_t offset,
  44                               uint32_t value)
  45 {
  46     m5208_timer_state *s = (m5208_timer_state *)opaque;
  47     int prescale;
  48     int limit;
  49     switch (offset) {
  50     case 0:
  51         /* The PIF bit is set-to-clear.  */
  52         if (value & PCSR_PIF) {
  53             s->pcsr &= ~PCSR_PIF;
  54             value &= ~PCSR_PIF;
  55         }
  56         /* Avoid frobbing the timer if we're just twiddling IRQ bits. */
  57         if (((s->pcsr ^ value) & ~PCSR_PIE) == 0) {
  58             s->pcsr = value;
  59             m5208_timer_update(s);
  60             return;
  61         }
  62
  63         if (s->pcsr & PCSR_EN)
  64             ptimer_stop(s->timer);
  65
  66         s->pcsr = value;
  67
  68         prescale = 1 << ((s->pcsr & PCSR_PRE_MASK) >> PCSR_PRE_SHIFT);
  69         ptimer_set_freq(s->timer, (SYS_FREQ / 2) / prescale);
  70         if (s->pcsr & PCSR_RLD)
  71             limit = s->pmr;
  72         else
  73             limit = 0xffff;
  74         ptimer_set_limit(s->timer, limit, 0);
  75
  76         if (s->pcsr & PCSR_EN)
  77             ptimer_run(s->timer, 0);
  78         break;
  79     case 2:
  80         s->pmr = value;
  81         s->pcsr &= ~PCSR_PIF;
  82         if ((s->pcsr & PCSR_RLD) == 0) {
  83             if (s->pcsr & PCSR_OVW)
  84                 ptimer_set_count(s->timer, value);
  85         } else {
  86             ptimer_set_limit(s->timer, value, s->pcsr & PCSR_OVW);
  87         }
  88         break;
  89     case 4:
  90         break;
  91     default:
  92         cpu_abort(cpu_single_env, "m5208_timer_write: Bad offset 0x%x\n",
  93                   (int)offset);
  94         break;
  95     }
  96     m5208_timer_update(s);
  97 }
  98
  99 static void m5208_timer_trigger(void *opaque)
 100 {
 101     m5208_timer_state *s = (m5208_timer_state *)opaque;
 102     s->pcsr |= PCSR_PIF;
 103     m5208_timer_update(s);
 104 }
 105
 106 static uint32_t m5208_timer_read(void *opaque, target_phys_addr_t addr)
 107 {
 108     m5208_timer_state *s = (m5208_timer_state *)opaque;
 109     switch (addr) {
 110     case 0:
 111         return s->pcsr;
 112     case 2:
 113         return s->pmr;
 114     case 4:
 115         return ptimer_get_count(s->timer);
 116     default:
 117         cpu_abort(cpu_single_env, "m5208_timer_read: Bad offset 0x%x\n",
 118                   (int)addr);
 119         return 0;
 120     }
 121 }
 122
 123 static CPUReadMemoryFunc *m5208_timer_readfn[] = {
 124    m5208_timer_read,
 125    m5208_timer_read,
 126    m5208_timer_read
 127 };
 128
 129 static CPUWriteMemoryFunc *m5208_timer_writefn[] = {
 130    m5208_timer_write,
 131    m5208_timer_write,
 132    m5208_timer_write
 133 };
 134
 135 static uint32_t m5208_sys_read(void *opaque, target_phys_addr_t addr)
 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         cpu_abort(cpu_single_env, "m5208_sys_read: Bad offset 0x%x\n",
 152                   (int)addr);
 153         return 0;
 154     }
 155 }
 156
 157 static void m5208_sys_write(void *opaque, target_phys_addr_t addr,
 158                             uint32_t value)
 159 {
 160     cpu_abort(cpu_single_env, "m5208_sys_write: Bad offset 0x%x\n",
 161               (int)addr);
 162 }
 163
 164 static CPUReadMemoryFunc *m5208_sys_readfn[] = {
 165    m5208_sys_read,
 166    m5208_sys_read,
 167    m5208_sys_read
 168 };
 169
 170 static CPUWriteMemoryFunc *m5208_sys_writefn[] = {
 171    m5208_sys_write,
 172    m5208_sys_write,
 173    m5208_sys_write
 174 };
 175
 176 static void mcf5208_sys_init(qemu_irq *pic)
 177 {
 178     int iomemtype;
 179     m5208_timer_state *s;
 180     QEMUBH *bh;
 181     int i;
 182
 183     iomemtype = cpu_register_io_memory(0, m5208_sys_readfn,
 184                                        m5208_sys_writefn, NULL);
 185     /* SDRAMC.  */
 186     cpu_register_physical_memory(0xfc0a8000, 0x00004000, iomemtype);
 187     /* Timers.  */
 188     for (i = 0; i < 2; i++) {
 189         s = (m5208_timer_state *)qemu_mallocz(sizeof(m5208_timer_state));
 190         bh = qemu_bh_new(m5208_timer_trigger, s);
 191         s->timer = ptimer_init(bh);
 192         iomemtype = cpu_register_io_memory(0, m5208_timer_readfn,
 193                                            m5208_timer_writefn, s);
 194         cpu_register_physical_memory(0xfc080000 + 0x4000 * i, 0x00004000,
 195                                      iomemtype);
 196         s->irq = pic[4 + i];
 197     }
 198 }
 199
 200 static void mcf5208evb_init(ram_addr_t ram_size, int vga_ram_size,
 201                      const char *boot_device,
 202                      const char *kernel_filename, const char *kernel_cmdline,
 203                      const char *initrd_filename, const char *cpu_model)
 204 {
 205     CPUState *env;
 206     int kernel_size;
 207     uint64_t elf_entry;
 208     target_ulong entry;
 209     qemu_irq *pic;
 210
 211     if (!cpu_model)
 212         cpu_model = "m5208";
 213     env = cpu_init(cpu_model);
 214     if (!env) {
 215         fprintf(stderr, "Unable to find m68k CPU definition\n");
 216         exit(1);
 217     }
 218
 219     /* Initialize CPU registers.  */
 220     env->vbr = 0;
 221     /* TODO: Configure BARs.  */
 222
 223     /* DRAM at 0x40000000 */
 224     cpu_register_physical_memory(0x40000000, ram_size,
 225         qemu_ram_alloc(ram_size) | IO_MEM_RAM);
 226
 227     /* Internal SRAM.  */
 228     cpu_register_physical_memory(0x80000000, 16384,
 229         qemu_ram_alloc(16384) | IO_MEM_RAM);
 230
 231     /* Internal peripherals.  */
 232     pic = mcf_intc_init(0xfc048000, env);
 233
 234     mcf_uart_mm_init(0xfc060000, pic[26], serial_hds[0]);
 235     mcf_uart_mm_init(0xfc064000, pic[27], serial_hds[1]);
 236     mcf_uart_mm_init(0xfc068000, pic[28], serial_hds[2]);
 237
 238     mcf5208_sys_init(pic);
 239
 240     if (nb_nics > 1) {
 241         fprintf(stderr, "Too many NICs\n");
 242         exit(1);
 243     }
 244     if (nd_table[0].vlan)
 245         mcf_fec_init(&nd_table[0], 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         fprintf(stderr, "Kernel image must be specified\n");
 272         exit(1);
 273     }
 274
 275     kernel_size = load_elf(kernel_filename, 0, &elf_entry, NULL, NULL);
 276     entry = elf_entry;
 277     if (kernel_size < 0) {
 278         kernel_size = load_uimage(kernel_filename, &entry, NULL, NULL);
 279     }
 280     if (kernel_size < 0) {
 281         kernel_size = load_image_targphys(kernel_filename, 0x40000000,
 282                                           ram_size);
 283         entry = 0x40000000;
 284     }
 285     if (kernel_size < 0) {
 286         fprintf(stderr, "qemu: could not load kernel '%s'\n", kernel_filename);
 287         exit(1);
 288     }
 289
 290     env->pc = entry;
 291 }
 292
 293 QEMUMachine mcf5208evb_machine = {
 294     .name = "mcf5208evb",
 295     .desc = "MCF5206EVB",
 296     .init = mcf5208evb_init,
 297 };