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 "etraxfs.h"
  30 #include "loader.h"
  31 #include "elf.h"
  32 #include "cris-boot.h"
  33 #include "blockdev.h"
  34 #include "exec-memory.h"
  35
  36 #define D(x)
  37 #define DNAND(x)
  38
  39 struct nand_state_t
  40 {
  41     DeviceState *nand;
  42     MemoryRegion iomem;
  43     unsigned int rdy:1;
  44     unsigned int ale:1;
  45     unsigned int cle:1;
  46     unsigned int ce:1;
  47 };
  48
  49 static struct nand_state_t nand_state;
  50 static uint64_t nand_read(void *opaque, hwaddr addr, unsigned size)
  51 {
  52     struct nand_state_t *s = opaque;
  53     uint32_t r;
  54     int rdy;
  55
  56     r = nand_getio(s->nand);
  57     nand_getpins(s->nand, &rdy);
  58     s->rdy = rdy;
  59
  60     DNAND(printf("%s addr=%x r=%x\n", __func__, addr, r));
  61     return r;
  62 }
  63
  64 static void
  65 nand_write(void *opaque, hwaddr addr, uint64_t value,
  66            unsigned size)
  67 {
  68     struct nand_state_t *s = opaque;
  69     int rdy;
  70
  71     DNAND(printf("%s addr=%x v=%x\n", __func__, addr, (unsigned)value));
  72     nand_setpins(s->nand, s->cle, s->ale, s->ce, 1, 0);
  73     nand_setio(s->nand, value);
  74     nand_getpins(s->nand, &rdy);
  75     s->rdy = rdy;
  76 }
  77
  78 static const MemoryRegionOps nand_ops = {
  79     .read = nand_read,
  80     .write = nand_write,
  81     .endianness = DEVICE_NATIVE_ENDIAN,
  82 };
  83
  84 struct tempsensor_t
  85 {
  86     unsigned int shiftreg;
  87     unsigned int count;
  88     enum {
  89         ST_OUT, ST_IN, ST_Z
  90     } state;
  91
  92     uint16_t regs[3];
  93 };
  94
  95 static void tempsensor_clkedge(struct tempsensor_t *s,
  96                                unsigned int clk, unsigned int data_in)
  97 {
  98     D(printf("%s clk=%d state=%d sr=%x\n", __func__,
  99              clk, s->state, s->shiftreg));
 100     if (s->count == 0) {
 101         s->count = 16;
 102         s->state = ST_OUT;
 103     }
 104     switch (s->state) {
 105         case ST_OUT:
 106             /* Output reg is clocked at negedge.  */
 107             if (!clk) {
 108                 s->count--;
 109                 s->shiftreg <<= 1;
 110                 if (s->count == 0) {
 111                     s->shiftreg = 0;
 112                     s->state = ST_IN;
 113                     s->count = 16;
 114                 }
 115             }
 116             break;
 117         case ST_Z:
 118             if (clk) {
 119                 s->count--;
 120                 if (s->count == 0) {
 121                     s->shiftreg = 0;
 122                     s->state = ST_OUT;
 123                     s->count = 16;
 124                 }
 125             }
 126             break;
 127         case ST_IN:
 128             /* Indata is sampled at posedge.  */
 129             if (clk) {
 130                 s->count--;
 131                 s->shiftreg <<= 1;
 132                 s->shiftreg |= data_in & 1;
 133                 if (s->count == 0) {
 134                     D(printf("%s cfgreg=%x\n", __func__, s->shiftreg));
 135                     s->regs[0] = s->shiftreg;
 136                     s->state = ST_OUT;
 137                     s->count = 16;
 138
 139                     if ((s->regs[0] & 0xff) == 0) {
 140                         /* 25 degrees celcius.  */
 141                         s->shiftreg = 0x0b9f;
 142                     } else if ((s->regs[0] & 0xff) == 0xff) {
 143                         /* Sensor ID, 0x8100 LM70.  */
 144                         s->shiftreg = 0x8100;
 145                     } else
 146                         printf("Invalid tempsens state %x\n", s->regs[0]);
 147                 }
 148             }
 149             break;
 150     }
 151 }
 152
 153
 154 #define RW_PA_DOUT    0x00
 155 #define R_PA_DIN      0x01
 156 #define RW_PA_OE      0x02
 157 #define RW_PD_DOUT    0x10
 158 #define R_PD_DIN      0x11
 159 #define RW_PD_OE      0x12
 160
 161 static struct gpio_state_t
 162 {
 163     MemoryRegion iomem;
 164     struct nand_state_t *nand;
 165     struct tempsensor_t tempsensor;
 166     uint32_t regs[0x5c / 4];
 167 } gpio_state;
 168
 169 static uint64_t gpio_read(void *opaque, hwaddr addr, unsigned size)
 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_write(void *opaque, hwaddr addr, uint64_t value,
 199                        unsigned size)
 200 {
 201     struct gpio_state_t *s = opaque;
 202     D(printf("%s %x=%x\n", __func__, addr, (unsigned)value));
 203
 204     addr >>= 2;
 205     switch (addr)
 206     {
 207         case RW_PA_DOUT:
 208             /* Decode nand pins.  */
 209             s->nand->ale = !!(value & (1 << 6));
 210             s->nand->cle = !!(value & (1 << 5));
 211             s->nand->ce  = !!(value & (1 << 4));
 212
 213             s->regs[addr] = value;
 214             break;
 215
 216         case RW_PD_DOUT:
 217             /* Temp sensor clk.  */
 218             if ((s->regs[addr] ^ value) & 2)
 219                 tempsensor_clkedge(&s->tempsensor, !!(value & 2),
 220                                    !!(value & 16));
 221             s->regs[addr] = value;
 222             break;
 223
 224         default:
 225             s->regs[addr] = value;
 226             break;
 227     }
 228 }
 229
 230 static const MemoryRegionOps gpio_ops = {
 231     .read = gpio_read,
 232     .write = gpio_write,
 233     .endianness = DEVICE_NATIVE_ENDIAN,
 234     .valid = {
 235         .min_access_size = 4,
 236         .max_access_size = 4,
 237     },
 238 };
 239
 240 #define INTMEM_SIZE (128 * 1024)
 241
 242 static struct cris_load_info li;
 243
 244 static
 245 void axisdev88_init(QEMUMachineInitArgs *args)
 246 {
 247     ram_addr_t ram_size = args->ram_size;
 248     const char *cpu_model = args->cpu_model;
 249     const char *kernel_filename = args->kernel_filename;
 250     const char *kernel_cmdline = args->kernel_cmdline;
 251     CRISCPU *cpu;
 252     CPUCRISState *env;
 253     DeviceState *dev;
 254     SysBusDevice *s;
 255     DriveInfo *nand;
 256     qemu_irq irq[30], nmi[2], *cpu_irq;
 257     void *etraxfs_dmac;
 258     struct etraxfs_dma_client *dma_eth;
 259     int i;
 260     MemoryRegion *address_space_mem = get_system_memory();
 261     MemoryRegion *phys_ram = g_new(MemoryRegion, 1);
 262     MemoryRegion *phys_intmem = g_new(MemoryRegion, 1);
 263
 264     /* init CPUs */
 265     if (cpu_model == NULL) {
 266         cpu_model = "crisv32";
 267     }
 268     cpu = cpu_cris_init(cpu_model);
 269     env = &cpu->env;
 270
 271     /* allocate RAM */
 272     memory_region_init_ram(phys_ram, "axisdev88.ram", ram_size);
 273     vmstate_register_ram_global(phys_ram);
 274     memory_region_add_subregion(address_space_mem, 0x40000000, phys_ram);
 275
 276     /* The ETRAX-FS has 128Kb on chip ram, the docs refer to it as the
 277        internal memory.  */
 278     memory_region_init_ram(phys_intmem, "axisdev88.chipram", INTMEM_SIZE);
 279     vmstate_register_ram_global(phys_intmem);
 280     memory_region_add_subregion(address_space_mem, 0x38000000, phys_intmem);
 281
 282       /* Attach a NAND flash to CS1.  */
 283     nand = drive_get(IF_MTD, 0, 0);
 284     nand_state.nand = nand_init(nand ? nand->bdrv : NULL,
 285                                 NAND_MFR_STMICRO, 0x39);
 286     memory_region_init_io(&nand_state.iomem, &nand_ops, &nand_state,
 287                           "nand", 0x05000000);
 288     memory_region_add_subregion(address_space_mem, 0x10000000,
 289                                 &nand_state.iomem);
 290
 291     gpio_state.nand = &nand_state;
 292     memory_region_init_io(&gpio_state.iomem, &gpio_ops, &gpio_state,
 293                           "gpio", 0x5c);
 294     memory_region_add_subregion(address_space_mem, 0x3001a000,
 295                                 &gpio_state.iomem);
 296
 297
 298     cpu_irq = cris_pic_init_cpu(env);
 299     dev = qdev_create(NULL, "etraxfs,pic");
 300     /* FIXME: Is there a proper way to signal vectors to the CPU core?  */
 301     qdev_prop_set_ptr(dev, "interrupt_vector", &env->interrupt_vector);
 302     qdev_init_nofail(dev);
 303     s = sysbus_from_qdev(dev);
 304     sysbus_mmio_map(s, 0, 0x3001c000);
 305     sysbus_connect_irq(s, 0, cpu_irq[0]);
 306     sysbus_connect_irq(s, 1, cpu_irq[1]);
 307     for (i = 0; i < 30; i++) {
 308         irq[i] = qdev_get_gpio_in(dev, i);
 309     }
 310     nmi[0] = qdev_get_gpio_in(dev, 30);
 311     nmi[1] = qdev_get_gpio_in(dev, 31);
 312
 313     etraxfs_dmac = etraxfs_dmac_init(0x30000000, 10);
 314     for (i = 0; i < 10; i++) {
 315         /* On ETRAX, odd numbered channels are inputs.  */
 316         etraxfs_dmac_connect(etraxfs_dmac, i, irq + 7 + i, i & 1);
 317     }
 318
 319     /* Add the two ethernet blocks.  */
 320     dma_eth = g_malloc0(sizeof dma_eth[0] * 4); /* Allocate 4 channels.  */
 321     etraxfs_eth_init(&nd_table[0], 0x30034000, 1, &dma_eth[0], &dma_eth[1]);
 322     if (nb_nics > 1) {
 323         etraxfs_eth_init(&nd_table[1], 0x30036000, 2, &dma_eth[2], &dma_eth[3]);
 324     }
 325
 326     /* The DMA Connector block is missing, hardwire things for now.  */
 327     etraxfs_dmac_connect_client(etraxfs_dmac, 0, &dma_eth[0]);
 328     etraxfs_dmac_connect_client(etraxfs_dmac, 1, &dma_eth[1]);
 329     if (nb_nics > 1) {
 330         etraxfs_dmac_connect_client(etraxfs_dmac, 6, &dma_eth[2]);
 331         etraxfs_dmac_connect_client(etraxfs_dmac, 7, &dma_eth[3]);
 332     }
 333
 334     /* 2 timers.  */
 335     sysbus_create_varargs("etraxfs,timer", 0x3001e000, irq[0x1b], nmi[1], NULL);
 336     sysbus_create_varargs("etraxfs,timer", 0x3005e000, irq[0x1b], nmi[1], NULL);
 337
 338     for (i = 0; i < 4; i++) {
 339         sysbus_create_simple("etraxfs,serial", 0x30026000 + i * 0x2000,
 340                              irq[0x14 + i]);
 341     }
 342
 343     if (!kernel_filename) {
 344         fprintf(stderr, "Kernel image must be specified\n");
 345         exit(1);
 346     }
 347
 348     li.image_filename = kernel_filename;
 349     li.cmdline = kernel_cmdline;
 350     cris_load_image(cpu, &li);
 351 }
 352
 353 static QEMUMachine axisdev88_machine = {
 354     .name = "axis-dev88",
 355     .desc = "AXIS devboard 88",
 356     .init = axisdev88_init,
 357     .is_default = 1,
 358 };
 359
 360 static void axisdev88_machine_init(void)
 361 {
 362     qemu_register_machine(&axisdev88_machine);
 363 }
 364
 365 machine_init(axisdev88_machine_init);