hw/axis_dev88.c

   1 /*
   2  * QEMU model for the AXIS devboard 88.
   3  *
   4  * Copyright (c) 2009 Edgar E. Iglesias, Axis Communications AB.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "sysbus.h"
  26 #include "net.h"
  27 #include "flash.h"
  28 #include "boards.h"
  29 #include "sysemu.h"
  30 #include "etraxfs.h"
  31 #include "loader.h"
  32 #include "elf.h"
  33
  34 #define D(x)
  35 #define DNAND(x)
  36
  37 struct nand_state_t
  38 {
  39     NANDFlashState *nand;
  40     unsigned int rdy:1;
  41     unsigned int ale:1;
  42     unsigned int cle:1;
  43     unsigned int ce:1;
  44 };
  45
  46 static struct nand_state_t nand_state;
  47 static uint32_t nand_readl (void *opaque, target_phys_addr_t addr)
  48 {
  49     struct nand_state_t *s = opaque;
  50     uint32_t r;
  51     int rdy;
  52
  53     r = nand_getio(s->nand);
  54     nand_getpins(s->nand, &rdy);
  55     s->rdy = rdy;
  56
  57     DNAND(printf("%s addr=%x r=%x\n", __func__, addr, r));
  58     return r;
  59 }
  60
  61 static void
  62 nand_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
  63 {
  64     struct nand_state_t *s = opaque;
  65     int rdy;
  66
  67     DNAND(printf("%s addr=%x v=%x\n", __func__, addr, value));
  68     nand_setpins(s->nand, s->cle, s->ale, s->ce, 1, 0);
  69     nand_setio(s->nand, value);
  70     nand_getpins(s->nand, &rdy);
  71     s->rdy = rdy;
  72 }
  73
  74 static CPUReadMemoryFunc * const nand_read[] = {
  75     &nand_readl,
  76     &nand_readl,
  77     &nand_readl,
  78 };
  79
  80 static CPUWriteMemoryFunc * const nand_write[] = {
  81     &nand_writel,
  82     &nand_writel,
  83     &nand_writel,
  84 };
  85
  86
  87 struct tempsensor_t
  88 {
  89     unsigned int shiftreg;
  90     unsigned int count;
  91     enum {
  92         ST_OUT, ST_IN, ST_Z
  93     } state;
  94
  95     uint16_t regs[3];
  96 };
  97
  98 static void tempsensor_clkedge(struct tempsensor_t *s,
  99                                unsigned int clk, unsigned int data_in)
 100 {
 101     D(printf("%s clk=%d state=%d sr=%x\n", __func__,
 102              clk, s->state, s->shiftreg));
 103     if (s->count == 0) {
 104         s->count = 16;
 105         s->state = ST_OUT;
 106     }
 107     switch (s->state) {
 108         case ST_OUT:
 109             /* Output reg is clocked at negedge.  */
 110             if (!clk) {
 111                 s->count--;
 112                 s->shiftreg <<= 1;
 113                 if (s->count == 0) {
 114                     s->shiftreg = 0;
 115                     s->state = ST_IN;
 116                     s->count = 16;
 117                 }
 118             }
 119             break;
 120         case ST_Z:
 121             if (clk) {
 122                 s->count--;
 123                 if (s->count == 0) {
 124                     s->shiftreg = 0;
 125                     s->state = ST_OUT;
 126                     s->count = 16;
 127                 }
 128             }
 129             break;
 130         case ST_IN:
 131             /* Indata is sampled at posedge.  */
 132             if (clk) {
 133                 s->count--;
 134                 s->shiftreg <<= 1;
 135                 s->shiftreg |= data_in & 1;
 136                 if (s->count == 0) {
 137                     D(printf("%s cfgreg=%x\n", __func__, s->shiftreg));
 138                     s->regs[0] = s->shiftreg;
 139                     s->state = ST_OUT;
 140                     s->count = 16;
 141
 142                     if ((s->regs[0] & 0xff) == 0) {
 143                         /* 25 degrees celcius.  */
 144                         s->shiftreg = 0x0b9f;
 145                     } else if ((s->regs[0] & 0xff) == 0xff) {
 146                         /* Sensor ID, 0x8100 LM70.  */
 147                         s->shiftreg = 0x8100;
 148                     } else
 149                         printf("Invalid tempsens state %x\n", s->regs[0]);
 150                 }
 151             }
 152             break;
 153     }
 154 }
 155
 156
 157 #define RW_PA_DOUT    0x00
 158 #define R_PA_DIN      0x01
 159 #define RW_PA_OE      0x02
 160 #define RW_PD_DOUT    0x10
 161 #define R_PD_DIN      0x11
 162 #define RW_PD_OE      0x12
 163
 164 static struct gpio_state_t
 165 {
 166     struct nand_state_t *nand;
 167     struct tempsensor_t tempsensor;
 168     uint32_t regs[0x5c / 4];
 169 } gpio_state;
 170
 171 static uint32_t gpio_readl (void *opaque, target_phys_addr_t addr)
 172 {
 173     struct gpio_state_t *s = opaque;
 174     uint32_t r = 0;
 175
 176     addr >>= 2;
 177     switch (addr)
 178     {
 179         case R_PA_DIN:
 180             r = s->regs[RW_PA_DOUT] & s->regs[RW_PA_OE];
 181
 182             /* Encode pins from the nand.  */
 183             r |= s->nand->rdy << 7;
 184             break;
 185         case R_PD_DIN:
 186             r = s->regs[RW_PD_DOUT] & s->regs[RW_PD_OE];
 187
 188             /* Encode temp sensor pins.  */
 189             r |= (!!(s->tempsensor.shiftreg & 0x10000)) << 4;
 190             break;
 191
 192         default:
 193             r = s->regs[addr];
 194             break;
 195     }
 196     return r;
 197     D(printf("%s %x=%x\n", __func__, addr, r));
 198 }
 199
 200 static void gpio_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
 201 {
 202     struct gpio_state_t *s = opaque;
 203     D(printf("%s %x=%x\n", __func__, addr, value));
 204
 205     addr >>= 2;
 206     switch (addr)
 207     {
 208         case RW_PA_DOUT:
 209             /* Decode nand pins.  */
 210             s->nand->ale = !!(value & (1 << 6));
 211             s->nand->cle = !!(value & (1 << 5));
 212             s->nand->ce  = !!(value & (1 << 4));
 213
 214             s->regs[addr] = value;
 215             break;
 216
 217         case RW_PD_DOUT:
 218             /* Temp sensor clk.  */
 219             if ((s->regs[addr] ^ value) & 2)
 220                 tempsensor_clkedge(&s->tempsensor, !!(value & 2),
 221                                    !!(value & 16));
 222             s->regs[addr] = value;
 223             break;
 224
 225         default:
 226             s->regs[addr] = value;
 227             break;
 228     }
 229 }
 230
 231 static CPUReadMemoryFunc * const gpio_read[] = {
 232     NULL, NULL,
 233     &gpio_readl,
 234 };
 235
 236 static CPUWriteMemoryFunc * const gpio_write[] = {
 237     NULL, NULL,
 238     &gpio_writel,
 239 };
 240
 241 #define INTMEM_SIZE (128 * 1024)
 242
 243 static struct {
 244     uint32_t bootstrap_pc;
 245     uint32_t regs[16];
 246 } loadargs;
 247
 248 static void main_cpu_reset(void *opaque)
 249 {
 250     int i;
 251
 252     CPUState *env = opaque;
 253     cpu_reset(env);
 254
 255     env->pc = loadargs.bootstrap_pc;
 256     for (i = 0; i < 16; i++) {
 257         env->regs[i] = loadargs.regs[i];
 258     }
 259 }
 260
 261 static uint64_t translate_kernel_address(void *opaque, uint64_t addr)
 262 {
 263     return addr - 0x80000000LL;
 264 }
 265
 266 static
 267 void axisdev88_init (ram_addr_t ram_size,
 268                      const char *boot_device,
 269                      const char *kernel_filename, const char *kernel_cmdline,
 270                      const char *initrd_filename, const char *cpu_model)
 271 {
 272     CPUState *env;
 273     DeviceState *dev;
 274     SysBusDevice *s;
 275     qemu_irq irq[30], nmi[2], *cpu_irq;
 276     void *etraxfs_dmac;
 277     struct etraxfs_dma_client *eth[2] = {NULL, NULL};
 278     int kernel_size;
 279     int i;
 280     int nand_regs;
 281     int gpio_regs;
 282     ram_addr_t phys_ram;
 283     ram_addr_t phys_intmem;
 284
 285     /* init CPUs */
 286     if (cpu_model == NULL) {
 287         cpu_model = "crisv32";
 288     }
 289     env = cpu_init(cpu_model);
 290     qemu_register_reset(main_cpu_reset, env);
 291
 292     /* allocate RAM */
 293     phys_ram = qemu_ram_alloc(ram_size);
 294     cpu_register_physical_memory(0x40000000, ram_size, phys_ram | IO_MEM_RAM);
 295
 296     /* The ETRAX-FS has 128Kb on chip ram, the docs refer to it as the
 297        internal memory.  */
 298     phys_intmem = qemu_ram_alloc(INTMEM_SIZE);
 299     cpu_register_physical_memory(0x38000000, INTMEM_SIZE,
 300                                  phys_intmem | IO_MEM_RAM);
 301
 302
 303       /* Attach a NAND flash to CS1.  */
 304     nand_state.nand = nand_init(NAND_MFR_STMICRO, 0x39);
 305     nand_regs = cpu_register_io_memory(nand_read, nand_write, &nand_state);
 306     cpu_register_physical_memory(0x10000000, 0x05000000, nand_regs);
 307
 308     gpio_state.nand = &nand_state;
 309     gpio_regs = cpu_register_io_memory(gpio_read, gpio_write, &gpio_state);
 310     cpu_register_physical_memory(0x3001a000, 0x5c, gpio_regs);
 311
 312
 313     cpu_irq = cris_pic_init_cpu(env);
 314     dev = qdev_create(NULL, "etraxfs,pic");
 315     /* FIXME: Is there a proper way to signal vectors to the CPU core?  */
 316     qdev_prop_set_ptr(dev, "interrupt_vector", &env->interrupt_vector);
 317     qdev_init_nofail(dev);
 318     s = sysbus_from_qdev(dev);
 319     sysbus_mmio_map(s, 0, 0x3001c000);
 320     sysbus_connect_irq(s, 0, cpu_irq[0]);
 321     sysbus_connect_irq(s, 1, cpu_irq[1]);
 322     for (i = 0; i < 30; i++) {
 323         irq[i] = qdev_get_gpio_in(dev, i);
 324     }
 325     nmi[0] = qdev_get_gpio_in(dev, 30);
 326     nmi[1] = qdev_get_gpio_in(dev, 31);
 327
 328     etraxfs_dmac = etraxfs_dmac_init(0x30000000, 10);
 329     for (i = 0; i < 10; i++) {
 330         /* On ETRAX, odd numbered channels are inputs.  */
 331         etraxfs_dmac_connect(etraxfs_dmac, i, irq + 7 + i, i & 1);
 332     }
 333
 334     /* Add the two ethernet blocks.  */
 335     eth[0] = etraxfs_eth_init(&nd_table[0], 0x30034000, 1);
 336     if (nb_nics > 1)
 337         eth[1] = etraxfs_eth_init(&nd_table[1], 0x30036000, 2);
 338
 339     /* The DMA Connector block is missing, hardwire things for now.  */
 340     etraxfs_dmac_connect_client(etraxfs_dmac, 0, eth[0]);
 341     etraxfs_dmac_connect_client(etraxfs_dmac, 1, eth[0] + 1);
 342     if (eth[1]) {
 343         etraxfs_dmac_connect_client(etraxfs_dmac, 6, eth[1]);
 344         etraxfs_dmac_connect_client(etraxfs_dmac, 7, eth[1] + 1);
 345     }
 346
 347     /* 2 timers.  */
 348     sysbus_create_varargs("etraxfs,timer", 0x3001e000, irq[0x1b], nmi[1], NULL);
 349     sysbus_create_varargs("etraxfs,timer", 0x3005e000, irq[0x1b], nmi[1], NULL);
 350
 351     for (i = 0; i < 4; i++) {
 352         sysbus_create_simple("etraxfs,serial", 0x30026000 + i * 0x2000,
 353                              irq[0x14 + i]);
 354     }
 355
 356     if (kernel_filename) {
 357         uint64_t entry, high;
 358         int kcmdline_len;
 359
 360         /* Boots a kernel elf binary, os/linux-2.6/vmlinux from the axis
 361            devboard SDK.  */
 362         kernel_size = load_elf(kernel_filename, translate_kernel_address, NULL,
 363                                &entry, NULL, &high, 0, ELF_MACHINE, 0);
 364         loadargs.bootstrap_pc = entry;
 365         if (kernel_size < 0) {
 366             /* Takes a kimage from the axis devboard SDK.  */
 367             kernel_size = load_image_targphys(kernel_filename, 0x40004000,
 368                                               ram_size);
 369             loadargs.bootstrap_pc = 0x40004000;
 370             loadargs.regs[9] = 0x40004000 + kernel_size;
 371         }
 372         loadargs.regs[8] = 0x56902387; /* RAM init magic.  */
 373
 374         if (kernel_cmdline && (kcmdline_len = strlen(kernel_cmdline))) {
 375             if (kcmdline_len > 256) {
 376                 fprintf(stderr, "Too long CRIS kernel cmdline (max 256)\n");
 377                 exit(1);
 378             }
 379             /* Let the kernel know we are modifying the cmdline.  */
 380             loadargs.regs[10] = 0x87109563;
 381             loadargs.regs[11] = 0x40000000;
 382             pstrcpy_targphys("cmdline", loadargs.regs[11], 256, kernel_cmdline);
 383         }
 384     }
 385 }
 386
 387 static QEMUMachine axisdev88_machine = {
 388     .name = "axis-dev88",
 389     .desc = "AXIS devboard 88",
 390     .init = axisdev88_init,
 391 };
 392
 393 static void axisdev88_machine_init(void)
 394 {
 395     qemu_register_machine(&axisdev88_machine);
 396 }
 397
 398 machine_init(axisdev88_machine_init);