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
  32 #define D(x)
  33 #define DNAND(x)
  34
  35 struct nand_state_t
  36 {
  37     NANDFlashState *nand;
  38     unsigned int rdy:1;
  39     unsigned int ale:1;
  40     unsigned int cle:1;
  41     unsigned int ce:1;
  42 };
  43
  44 static struct nand_state_t nand_state;
  45 static uint32_t nand_readl (void *opaque, target_phys_addr_t addr)
  46 {
  47     struct nand_state_t *s = opaque;
  48     uint32_t r;
  49     int rdy;
  50
  51     r = nand_getio(s->nand);
  52     nand_getpins(s->nand, &rdy);
  53     s->rdy = rdy;
  54
  55     DNAND(printf("%s addr=%x r=%x\n", __func__, addr, r));
  56     return r;
  57 }
  58
  59 static void
  60 nand_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
  61 {
  62     struct nand_state_t *s = opaque;
  63     int rdy;
  64
  65     DNAND(printf("%s addr=%x v=%x\n", __func__, addr, value));
  66     nand_setpins(s->nand, s->cle, s->ale, s->ce, 1, 0);
  67     nand_setio(s->nand, value);
  68     nand_getpins(s->nand, &rdy);
  69     s->rdy = rdy;
  70 }
  71
  72 static CPUReadMemoryFunc *nand_read[] = {
  73     &nand_readl,
  74     &nand_readl,
  75     &nand_readl,
  76 };
  77
  78 static CPUWriteMemoryFunc *nand_write[] = {
  79     &nand_writel,
  80     &nand_writel,
  81     &nand_writel,
  82 };
  83
  84
  85 struct tempsensor_t
  86 {
  87     unsigned int shiftreg;
  88     unsigned int count;
  89     enum {
  90         ST_OUT, ST_IN, ST_Z
  91     } state;
  92
  93     uint16_t regs[3];
  94 };
  95
  96 static void tempsensor_clkedge(struct tempsensor_t *s,
  97                                unsigned int clk, unsigned int data_in)
  98 {
  99     D(printf("%s clk=%d state=%d sr=%x\n", __func__,
 100              clk, s->state, s->shiftreg));
 101     if (s->count == 0) {
 102         s->count = 16;
 103         s->state = ST_OUT;
 104     }
 105     switch (s->state) {
 106         case ST_OUT:
 107             /* Output reg is clocked at negedge.  */
 108             if (!clk) {
 109                 s->count--;
 110                 s->shiftreg <<= 1;
 111                 if (s->count == 0) {
 112                     s->shiftreg = 0;
 113                     s->state = ST_IN;
 114                     s->count = 16;
 115                 }
 116             }
 117             break;
 118         case ST_Z:
 119             if (clk) {
 120                 s->count--;
 121                 if (s->count == 0) {
 122                     s->shiftreg = 0;
 123                     s->state = ST_OUT;
 124                     s->count = 16;
 125                 }
 126             }
 127             break;
 128         case ST_IN:
 129             /* Indata is sampled at posedge.  */
 130             if (clk) {
 131                 s->count--;
 132                 s->shiftreg <<= 1;
 133                 s->shiftreg |= data_in & 1;
 134                 if (s->count == 0) {
 135                     D(printf("%s cfgreg=%x\n", __func__, s->shiftreg));
 136                     s->regs[0] = s->shiftreg;
 137                     s->state = ST_OUT;
 138                     s->count = 16;
 139
 140                     if ((s->regs[0] & 0xff) == 0) {
 141                         /* 25 degrees celcius.  */
 142                         s->shiftreg = 0x0b9f;
 143                     } else if ((s->regs[0] & 0xff) == 0xff) {
 144                         /* Sensor ID, 0x8100 LM70.  */
 145                         s->shiftreg = 0x8100;
 146                     } else
 147                         printf("Invalid tempsens state %x\n", s->regs[0]);
 148                 }
 149             }
 150             break;
 151     }
 152 }
 153
 154
 155 #define RW_PA_DOUT    0x00
 156 #define R_PA_DIN      0x01
 157 #define RW_PA_OE      0x02
 158 #define RW_PD_DOUT    0x10
 159 #define R_PD_DIN      0x11
 160 #define RW_PD_OE      0x12
 161
 162 static struct gpio_state_t
 163 {
 164     struct nand_state_t *nand;
 165     struct tempsensor_t tempsensor;
 166     uint32_t regs[0x5c / 4];
 167 } gpio_state;
 168
 169 static uint32_t gpio_readl (void *opaque, target_phys_addr_t addr)
 170 {
 171     struct gpio_state_t *s = opaque;
 172     uint32_t r = 0;
 173
 174     addr >>= 2;
 175     switch (addr)
 176     {
 177         case R_PA_DIN:
 178             r = s->regs[RW_PA_DOUT] & s->regs[RW_PA_OE];
 179
 180             /* Encode pins from the nand.  */
 181             r |= s->nand->rdy << 7;
 182             break;
 183         case R_PD_DIN:
 184             r = s->regs[RW_PD_DOUT] & s->regs[RW_PD_OE];
 185
 186             /* Encode temp sensor pins.  */
 187             r |= (!!(s->tempsensor.shiftreg & 0x10000)) << 4;
 188             break;
 189
 190         default:
 191             r = s->regs[addr];
 192             break;
 193     }
 194     return r;
 195     D(printf("%s %x=%x\n", __func__, addr, r));
 196 }
 197
 198 static void gpio_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
 199 {
 200     struct gpio_state_t *s = opaque;
 201     D(printf("%s %x=%x\n", __func__, addr, value));
 202
 203     addr >>= 2;
 204     switch (addr)
 205     {
 206         case RW_PA_DOUT:
 207             /* Decode nand pins.  */
 208             s->nand->ale = !!(value & (1 << 6));
 209             s->nand->cle = !!(value & (1 << 5));
 210             s->nand->ce  = !!(value & (1 << 4));
 211
 212             s->regs[addr] = value;
 213             break;
 214
 215         case RW_PD_DOUT:
 216             /* Temp sensor clk.  */
 217             if ((s->regs[addr] ^ value) & 2)
 218                 tempsensor_clkedge(&s->tempsensor, !!(value & 2),
 219                                    !!(value & 16));
 220             s->regs[addr] = value;
 221             break;
 222
 223         default:
 224             s->regs[addr] = value;
 225             break;
 226     }
 227 }
 228
 229 static CPUReadMemoryFunc *gpio_read[] = {
 230     NULL, NULL,
 231     &gpio_readl,
 232 };
 233
 234 static CPUWriteMemoryFunc *gpio_write[] = {
 235     NULL, NULL,
 236     &gpio_writel,
 237 };
 238
 239 #define INTMEM_SIZE (128 * 1024)
 240
 241 static uint32_t bootstrap_pc;
 242 static void main_cpu_reset(void *opaque)
 243 {
 244     CPUState *env = opaque;
 245     cpu_reset(env);
 246
 247     env->pc = bootstrap_pc;
 248 }
 249
 250 static
 251 void axisdev88_init (ram_addr_t ram_size,
 252                      const char *boot_device,
 253                      const char *kernel_filename, const char *kernel_cmdline,
 254                      const char *initrd_filename, const char *cpu_model)
 255 {
 256     CPUState *env;
 257     qemu_irq *irq, *nmi;
 258     void *etraxfs_dmac;
 259     struct etraxfs_dma_client *eth[2] = {NULL, NULL};
 260     int kernel_size;
 261     int i;
 262     int nand_regs;
 263     int gpio_regs;
 264     ram_addr_t phys_ram;
 265     ram_addr_t phys_intmem;
 266
 267     /* init CPUs */
 268     if (cpu_model == NULL) {
 269         cpu_model = "crisv32";
 270     }
 271     env = cpu_init(cpu_model);
 272     qemu_register_reset(main_cpu_reset, env);
 273
 274     /* allocate RAM */
 275     phys_ram = qemu_ram_alloc(ram_size);
 276     cpu_register_physical_memory(0x40000000, ram_size, phys_ram | IO_MEM_RAM);
 277
 278     /* The ETRAX-FS has 128Kb on chip ram, the docs refer to it as the
 279        internal memory.  */
 280     phys_intmem = qemu_ram_alloc(INTMEM_SIZE);
 281     cpu_register_physical_memory(0x38000000, INTMEM_SIZE,
 282                                  phys_intmem | IO_MEM_RAM);
 283
 284
 285       /* Attach a NAND flash to CS1.  */
 286     nand_state.nand = nand_init(NAND_MFR_STMICRO, 0x39);
 287     nand_regs = cpu_register_io_memory(0, nand_read, nand_write, &nand_state);
 288     cpu_register_physical_memory(0x10000000, 0x05000000, nand_regs);
 289
 290     gpio_state.nand = &nand_state;
 291     gpio_regs = cpu_register_io_memory(0, gpio_read, gpio_write, &gpio_state);
 292     cpu_register_physical_memory(0x3001a000, 0x5c, gpio_regs);
 293
 294
 295     irq = etraxfs_pic_init(env, 0x3001c000);
 296     nmi = irq + 30;
 297
 298     etraxfs_dmac = etraxfs_dmac_init(env, 0x30000000, 10);
 299     for (i = 0; i < 10; i++) {
 300         /* On ETRAX, odd numbered channels are inputs.  */
 301         etraxfs_dmac_connect(etraxfs_dmac, i, irq + 7 + i, i & 1);
 302     }
 303
 304     /* Add the two ethernet blocks.  */
 305     eth[0] = etraxfs_eth_init(&nd_table[0], env, irq + 25, 0x30034000, 1);
 306     if (nb_nics > 1)
 307         eth[1] = etraxfs_eth_init(&nd_table[1], env,
 308                                   irq + 26, 0x30036000, 2);
 309
 310     /* The DMA Connector block is missing, hardwire things for now.  */
 311     etraxfs_dmac_connect_client(etraxfs_dmac, 0, eth[0]);
 312     etraxfs_dmac_connect_client(etraxfs_dmac, 1, eth[0] + 1);
 313     if (eth[1]) {
 314         etraxfs_dmac_connect_client(etraxfs_dmac, 6, eth[1]);
 315         etraxfs_dmac_connect_client(etraxfs_dmac, 7, eth[1] + 1);
 316     }
 317
 318     /* 2 timers.  */
 319     etraxfs_timer_init(env, irq + 0x1b, nmi + 1, 0x3001e000);
 320     etraxfs_timer_init(env, irq + 0x1b, nmi + 1, 0x3005e000);
 321
 322     for (i = 0; i < 4; i++) {
 323         sysbus_create_simple("etraxfs,serial", 0x30026000 + i * 0x2000,
 324                              irq[0x14 + i]);
 325     }
 326
 327     if (kernel_filename) {
 328         uint64_t entry, high;
 329         int kcmdline_len;
 330
 331         /* Boots a kernel elf binary, os/linux-2.6/vmlinux from the axis
 332            devboard SDK.  */
 333         kernel_size = load_elf(kernel_filename, -0x80000000LL,
 334                                &entry, NULL, &high);
 335         bootstrap_pc = entry;
 336         if (kernel_size < 0) {
 337             /* Takes a kimage from the axis devboard SDK.  */
 338             kernel_size = load_image_targphys(kernel_filename, 0x40004000,
 339                                               ram_size);
 340             bootstrap_pc = 0x40004000;
 341             env->regs[9] = 0x40004000 + kernel_size;
 342         }
 343         env->regs[8] = 0x56902387; /* RAM init magic.  */
 344
 345         if (kernel_cmdline && (kcmdline_len = strlen(kernel_cmdline))) {
 346             if (kcmdline_len > 256) {
 347                 fprintf(stderr, "Too long CRIS kernel cmdline (max 256)\n");
 348                 exit(1);
 349             }
 350             /* Let the kernel know we are modifying the cmdline.  */
 351             env->regs[10] = 0x87109563;
 352             env->regs[11] = 0x40000000;
 353             pstrcpy_targphys(env->regs[11], 256, kernel_cmdline);
 354         }
 355     }
 356     env->pc = bootstrap_pc;
 357
 358     printf ("pc =%x\n", env->pc);
 359     printf ("ram size =%ld\n", ram_size);
 360 }
 361
 362 QEMUMachine axisdev88_machine = {
 363     .name = "axis-dev88",
 364     .desc = "AXIS devboard 88",
 365     .init = axisdev88_init,
 366 };