hw/lm32_sys.c

   1 /*
   2  *  QEMU model of the LatticeMico32 system control block.
   3  *
   4  *  Copyright (c) 2010 Michael Walle <michael@walle.cc>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 /*
  21  * This model is mainly intended for testing purposes and doesn't fit to any
  22  * real hardware. On the one hand it provides a control register (R_CTRL) on
  23  * the other hand it supports the lm32 tests.
  24  *
  25  * A write to the control register causes a system shutdown.
  26  * Tests first write the pointer to a test name to the test name register
  27  * (R_TESTNAME) and then write a zero to the pass/fail register (R_PASSFAIL) if
  28  * the test is passed or any non-zero value to it if the test is failed.
  29  */
  30
  31 #include "hw.h"
  32 #include "sysbus.h"
  33 #include "trace.h"
  34 #include "qemu-log.h"
  35 #include "qemu-error.h"
  36 #include "sysemu.h"
  37 #include "qemu-log.h"
  38
  39 enum {
  40     R_CTRL = 0,
  41     R_PASSFAIL,
  42     R_TESTNAME,
  43     R_MAX
  44 };
  45
  46 #define MAX_TESTNAME_LEN 16
  47
  48 struct LM32SysState {
  49     SysBusDevice busdev;
  50     uint32_t base;
  51     uint32_t regs[R_MAX];
  52     uint8_t testname[MAX_TESTNAME_LEN];
  53 };
  54 typedef struct LM32SysState LM32SysState;
  55
  56 static void copy_testname(LM32SysState *s)
  57 {
  58     cpu_physical_memory_read(s->regs[R_TESTNAME], s->testname,
  59             MAX_TESTNAME_LEN);
  60     s->testname[MAX_TESTNAME_LEN - 1] = '\0';
  61 }
  62
  63 static void sys_write(void *opaque, target_phys_addr_t addr, uint32_t value)
  64 {
  65     LM32SysState *s = opaque;
  66     char *testname;
  67
  68     trace_lm32_sys_memory_write(addr, value);
  69
  70     addr >>= 2;
  71     switch (addr) {
  72     case R_CTRL:
  73         qemu_system_shutdown_request();
  74         break;
  75     case R_PASSFAIL:
  76         s->regs[addr] = value;
  77         testname = (char *)s->testname;
  78         qemu_log("TC  %-16s %s\n", testname, (value) ? "FAILED" : "OK");
  79         break;
  80     case R_TESTNAME:
  81         s->regs[addr] = value;
  82         copy_testname(s);
  83         break;
  84
  85     default:
  86         error_report("lm32_sys: write access to unknown register 0x"
  87                 TARGET_FMT_plx, addr << 2);
  88         break;
  89     }
  90 }
  91
  92 static CPUReadMemoryFunc * const sys_read_fn[] = {
  93     NULL,
  94     NULL,
  95     NULL,
  96 };
  97
  98 static CPUWriteMemoryFunc * const sys_write_fn[] = {
  99     NULL,
 100     NULL,
 101     &sys_write,
 102 };
 103
 104 static void sys_reset(DeviceState *d)
 105 {
 106     LM32SysState *s = container_of(d, LM32SysState, busdev.qdev);
 107     int i;
 108
 109     for (i = 0; i < R_MAX; i++) {
 110         s->regs[i] = 0;
 111     }
 112     memset(s->testname, 0, MAX_TESTNAME_LEN);
 113 }
 114
 115 static int lm32_sys_init(SysBusDevice *dev)
 116 {
 117     LM32SysState *s = FROM_SYSBUS(typeof(*s), dev);
 118     int sys_regs;
 119
 120     sys_regs = cpu_register_io_memory(sys_read_fn, sys_write_fn, s,
 121             DEVICE_NATIVE_ENDIAN);
 122     sysbus_init_mmio(dev, R_MAX * 4, sys_regs);
 123
 124     /* Note: This device is not created in the board initialization,
 125      * instead it has to be added with the -device parameter. Therefore,
 126      * the device maps itself. */
 127     sysbus_mmio_map(dev, 0, s->base);
 128
 129     return 0;
 130 }
 131
 132 static const VMStateDescription vmstate_lm32_sys = {
 133     .name = "lm32-sys",
 134     .version_id = 1,
 135     .minimum_version_id = 1,
 136     .minimum_version_id_old = 1,
 137     .fields      = (VMStateField[]) {
 138         VMSTATE_UINT32_ARRAY(regs, LM32SysState, R_MAX),
 139         VMSTATE_BUFFER(testname, LM32SysState),
 140         VMSTATE_END_OF_LIST()
 141     }
 142 };
 143
 144 static SysBusDeviceInfo lm32_sys_info = {
 145     .init = lm32_sys_init,
 146     .qdev.name  = "lm32-sys",
 147     .qdev.size  = sizeof(LM32SysState),
 148     .qdev.vmsd  = &vmstate_lm32_sys,
 149     .qdev.reset = sys_reset,
 150     .qdev.props = (Property[]) {
 151         DEFINE_PROP_UINT32("base", LM32SysState, base, 0xffff0000),
 152         DEFINE_PROP_END_OF_LIST(),
 153     }
 154 };
 155
 156 static void lm32_sys_register(void)
 157 {
 158     sysbus_register_withprop(&lm32_sys_info);
 159 }
 160
 161 device_init(lm32_sys_register)