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 #include "cris-boot.h"
  34
  35 #define D(x)
  36 #define DNAND(x)
  37
  38 struct nand_state_t
  39 {
  40     NANDFlashState *nand;
  41     unsigned int rdy:1;
  42     unsigned int ale:1;
  43     unsigned int cle:1;
  44     unsigned int ce:1;
  45 };
  46
  47 static struct nand_state_t nand_state;
  48 static uint32_t nand_readl (void *opaque, target_phys_addr_t addr)
  49 {
  50     struct nand_state_t *s = opaque;
  51     uint32_t r;
  52     int rdy;
  53
  54     r = nand_getio(s->nand);
  55     nand_getpins(s->nand, &rdy);
  56     s->rdy = rdy;
  57
  58     DNAND(printf("%s addr=%x r=%x\n", __func__, addr, r));
  59     return r;
  60 }
  61
  62 static void
  63 nand_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
  64 {
  65     struct nand_state_t *s = opaque;
  66     int rdy;
  67
  68     DNAND(printf("%s addr=%x v=%x\n", __func__, addr, value));
  69     nand_setpins(s->nand, s->cle, s->ale, s->ce, 1, 0);
  70     nand_setio(s->nand, value);
  71     nand_getpins(s->nand, &rdy);
  72     s->rdy = rdy;
  73 }
  74
  75 static CPUReadMemoryFunc * const nand_read[] = {
  76     &nand_readl,
  77     &nand_readl,
  78     &nand_readl,
  79 };
  80
  81 static CPUWriteMemoryFunc * const nand_write[] = {
  82     &nand_writel,
  83     &nand_writel,
  84     &nand_writel,
  85 };
  86
  87
  88 struct tempsensor_t
  89 {
  90     unsigned int shiftreg;
  91     unsigned int count;
  92     enum {
  93         ST_OUT, ST_IN, ST_Z
  94     } state;
  95
  96     uint16_t regs[3];
  97 };
  98
  99 static void tempsensor_clkedge(struct tempsensor_t *s,
 100                                unsigned int clk, unsigned int data_in)
 101 {
 102     D(printf("%s clk=%d state=%d sr=%x\n", __func__,
 103              clk, s->state, s->shiftreg));
 104     if (s->count == 0) {
 105         s->count = 16;
 106         s->state = ST_OUT;
 107     }
 108     switch (s->state) {
 109         case ST_OUT:
 110             /* Output reg is clocked at negedge.  */
 111             if (!clk) {
 112                 s->count--;
 113                 s->shiftreg <<= 1;
 114                 if (s->count == 0) {
 115                     s->shiftreg = 0;
 116                     s->state = ST_IN;
 117                     s->count = 16;
 118                 }
 119             }
 120             break;
 121         case ST_Z:
 122             if (clk) {
 123                 s->count--;
 124                 if (s->count == 0) {
 125                     s->shiftreg = 0;
 126                     s->state = ST_OUT;
 127                     s->count = 16;
 128                 }
 129             }
 130             break;
 131         case ST_IN:
 132             /* Indata is sampled at posedge.  */
 133             if (clk) {
 134                 s->count--;
 135                 s->shiftreg <<= 1;
 136                 s->shiftreg |= data_in & 1;
 137                 if (s->count == 0) {
 138                     D(printf("%s cfgreg=%x\n", __func__, s->shiftreg));
 139                     s->regs[0] = s->shiftreg;
 140                     s->state = ST_OUT;
 141                     s->count = 16;
 142
 143                     if ((s->regs[0] & 0xff) == 0) {
 144                         /* 25 degrees celcius.  */
 145                         s->shiftreg = 0x0b9f;
 146                     } else if ((s->regs[0] & 0xff) == 0xff) {
 147                         /* Sensor ID, 0x8100 LM70.  */
 148                         s->shiftreg = 0x8100;
 149                     } else
 150                         printf("Invalid tempsens state %x\n", s->regs[0]);
 151                 }
 152             }
 153             break;
 154     }
 155 }
 156
 157
 158 #define RW_PA_DOUT    0x00
 159 #define R_PA_DIN      0x01
 160 #define RW_PA_OE      0x02
 161 #define RW_PD_DOUT    0x10
 162 #define R_PD_DIN      0x11
 163 #define RW_PD_OE      0x12
 164
 165 static struct gpio_state_t
 166 {
 167     struct nand_state_t *nand;
 168     struct tempsensor_t tempsensor;
 169     uint32_t regs[0x5c / 4];
 170 } gpio_state;
 171
 172 static uint32_t gpio_readl (void *opaque, target_phys_addr_t addr)
 173 {
 174     struct gpio_state_t *s = opaque;
 175     uint32_t r = 0;
 176
 177     addr >>= 2;
 178     switch (addr)
 179     {
 180         case R_PA_DIN:
 181             r = s->regs[RW_PA_DOUT] & s->regs[RW_PA_OE];
 182
 183             /* Encode pins from the nand.  */
 184             r |= s->nand->rdy << 7;
 185             break;
 186         case R_PD_DIN:
 187             r = s->regs[RW_PD_DOUT] & s->regs[RW_PD_OE];
 188
 189             /* Encode temp sensor pins.  */
 190             r |= (!!(s->tempsensor.shiftreg & 0x10000)) << 4;
 191             break;
 192
 193         default:
 194             r = s->regs[addr];
 195             break;
 196     }
 197     return r;
 198     D(printf("%s %x=%x\n", __func__, addr, r));
 199 }
 200
 201 static void gpio_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
 202 {
 203     struct gpio_state_t *s = opaque;
 204     D(printf("%s %x=%x\n", __func__, addr, value));
 205
 206     addr >>= 2;
 207     switch (addr)
 208     {
 209         case RW_PA_DOUT:
 210             /* Decode nand pins.  */
 211             s->nand->ale = !!(value & (1 << 6));
 212             s->nand->cle = !!(value & (1 << 5));
 213             s->nand->ce  = !!(value & (1 << 4));
 214
 215             s->regs[addr] = value;
 216             break;
 217
 218         case RW_PD_DOUT:
 219             /* Temp sensor clk.  */
 220             if ((s->regs[addr] ^ value) & 2)
 221                 tempsensor_clkedge(&s->tempsensor, !!(value & 2),
 222                                    !!(value & 16));
 223             s->regs[addr] = value;
 224             break;
 225
 226         default:
 227             s->regs[addr] = value;
 228             break;
 229     }
 230 }
 231
 232 static CPUReadMemoryFunc * const gpio_read[] = {
 233     NULL, NULL,
 234     &gpio_readl,
 235 };
 236
 237 static CPUWriteMemoryFunc * const gpio_write[] = {
 238     NULL, NULL,
 239     &gpio_writel,
 240 };
 241
 242 #define INTMEM_SIZE (128 * 1024)
 243
 244 static struct cris_load_info li;
 245
 246 static
 247 void axisdev88_init (ram_addr_t ram_size,
 248                      const char *boot_device,
 249                      const char *kernel_filename, const char *kernel_cmdline,
 250                      const char *initrd_filename, const char *cpu_model)
 251 {
 252     CPUState *env;
 253     DeviceState *dev;
 254     SysBusDevice *s;
 255     qemu_irq irq[30], nmi[2], *cpu_irq;
 256     void *etraxfs_dmac;
 257     struct etraxfs_dma_client *eth[2] = {NULL, NULL};
 258     int i;
 259     int nand_regs;
 260     int gpio_regs;
 261     ram_addr_t phys_ram;
 262     ram_addr_t phys_intmem;
 263
 264     /* init CPUs */
 265     if (cpu_model == NULL) {
 266         cpu_model = "crisv32";
 267     }
 268     env = cpu_init(cpu_model);
 269
 270     /* allocate RAM */
 271     phys_ram = qemu_ram_alloc(NULL, "axisdev88.ram", ram_size);
 272     cpu_register_physical_memory(0x40000000, ram_size, phys_ram | IO_MEM_RAM);
 273
 274     /* The ETRAX-FS has 128Kb on chip ram, the docs refer to it as the
 275        internal memory.  */
 276     phys_intmem = qemu_ram_alloc(NULL, "axisdev88.chipram", INTMEM_SIZE);
 277     cpu_register_physical_memory(0x38000000, INTMEM_SIZE,
 278                                  phys_intmem | IO_MEM_RAM);
 279
 280
 281       /* Attach a NAND flash to CS1.  */
 282     nand_state.nand = nand_init(NAND_MFR_STMICRO, 0x39);
 283     nand_regs = cpu_register_io_memory(nand_read, nand_write, &nand_state,
 284                                        DEVICE_NATIVE_ENDIAN);
 285     cpu_register_physical_memory(0x10000000, 0x05000000, nand_regs);
 286
 287     gpio_state.nand = &nand_state;
 288     gpio_regs = cpu_register_io_memory(gpio_read, gpio_write, &gpio_state,
 289                                        DEVICE_NATIVE_ENDIAN);
 290     cpu_register_physical_memory(0x3001a000, 0x5c, gpio_regs);
 291
 292
 293     cpu_irq = cris_pic_init_cpu(env);
 294     dev = qdev_create(NULL, "etraxfs,pic");
 295     /* FIXME: Is there a proper way to signal vectors to the CPU core?  */
 296     qdev_prop_set_ptr(dev, "interrupt_vector", &env->interrupt_vector);
 297     qdev_init_nofail(dev);
 298     s = sysbus_from_qdev(dev);
 299     sysbus_mmio_map(s, 0, 0x3001c000);
 300     sysbus_connect_irq(s, 0, cpu_irq[0]);
 301     sysbus_connect_irq(s, 1, cpu_irq[1]);
 302     for (i = 0; i < 30; i++) {
 303         irq[i] = qdev_get_gpio_in(dev, i);
 304     }
 305     nmi[0] = qdev_get_gpio_in(dev, 30);
 306     nmi[1] = qdev_get_gpio_in(dev, 31);
 307
 308     etraxfs_dmac = etraxfs_dmac_init(0x30000000, 10);
 309     for (i = 0; i < 10; i++) {
 310         /* On ETRAX, odd numbered channels are inputs.  */
 311         etraxfs_dmac_connect(etraxfs_dmac, i, irq + 7 + i, i & 1);
 312     }
 313
 314     /* Add the two ethernet blocks.  */
 315     eth[0] = etraxfs_eth_init(&nd_table[0], 0x30034000, 1);
 316     if (nb_nics > 1)
 317         eth[1] = etraxfs_eth_init(&nd_table[1], 0x30036000, 2);
 318
 319     /* The DMA Connector block is missing, hardwire things for now.  */
 320     etraxfs_dmac_connect_client(etraxfs_dmac, 0, eth[0]);
 321     etraxfs_dmac_connect_client(etraxfs_dmac, 1, eth[0] + 1);
 322     if (eth[1]) {
 323         etraxfs_dmac_connect_client(etraxfs_dmac, 6, eth[1]);
 324         etraxfs_dmac_connect_client(etraxfs_dmac, 7, eth[1] + 1);
 325     }
 326
 327     /* 2 timers.  */
 328     sysbus_create_varargs("etraxfs,timer", 0x3001e000, irq[0x1b], nmi[1], NULL);
 329     sysbus_create_varargs("etraxfs,timer", 0x3005e000, irq[0x1b], nmi[1], NULL);
 330
 331     for (i = 0; i < 4; i++) {
 332         sysbus_create_simple("etraxfs,serial", 0x30026000 + i * 0x2000,
 333                              irq[0x14 + i]);
 334     }
 335
 336     if (!kernel_filename) {
 337         fprintf(stderr, "Kernel image must be specified\n");
 338         exit(1);
 339     }
 340
 341     li.image_filename = kernel_filename;
 342     li.cmdline = kernel_cmdline;
 343     cris_load_image(env, &li);
 344 }
 345
 346 static QEMUMachine axisdev88_machine = {
 347     .name = "axis-dev88",
 348     .desc = "AXIS devboard 88",
 349     .init = axisdev88_init,
 350 };
 351
 352 static void axisdev88_machine_init(void)
 353 {
 354     qemu_register_machine(&axisdev88_machine);
 355 }
 356
 357 machine_init(axisdev88_machine_init);