Add qemu 2.4.0

Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>

1 files changed, 336 insertions, 0 deletions

diff --git a/qemu/hw/nvram/eeprom93xx.c b/qemu/hw/nvram/eeprom93xx.c
new file mode 100644
index 000000000..0af4d6707
--- /dev/null
+++ b/qemu/hw/nvram/eeprom93xx.c
@@ -0,0 +1,336 @@
+/*
+ * QEMU EEPROM 93xx emulation
+ *
+ * Copyright (c) 2006-2007 Stefan Weil
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Emulation for serial EEPROMs:
+ * NMC93C06 256-Bit (16 x 16)
+ * NMC93C46 1024-Bit (64 x 16)
+ * NMC93C56 2028 Bit (128 x 16)
+ * NMC93C66 4096 Bit (256 x 16)
+ * Compatible devices include FM93C46 and others.
+ *
+ * Other drivers use these interface functions:
+ * eeprom93xx_new   - add a new EEPROM (with 16, 64 or 256 words)
+ * eeprom93xx_free  - destroy EEPROM
+ * eeprom93xx_read  - read data from the EEPROM
+ * eeprom93xx_write - write data to the EEPROM
+ * eeprom93xx_data  - get EEPROM data array for external manipulation
+ *
+ * Todo list:
+ * - No emulation of EEPROM timings.
+ */
+
+#include "hw/hw.h"
+#include "hw/nvram/eeprom93xx.h"
+
+/* Debug EEPROM emulation. */
+//~ #define DEBUG_EEPROM
+
+#ifdef DEBUG_EEPROM
+#define logout(fmt, ...) fprintf(stderr, "EEPROM\t%-24s" fmt, __func__, ## __VA_ARGS__)
+#else
+#define logout(fmt, ...) ((void)0)
+#endif
+
+#define EEPROM_INSTANCE  0
+#define OLD_EEPROM_VERSION 20061112
+#define EEPROM_VERSION (OLD_EEPROM_VERSION + 1)
+
+#if 0
+typedef enum {
+  eeprom_read  = 0x80,   /* read register xx */
+  eeprom_write = 0x40,   /* write register xx */
+  eeprom_erase = 0xc0,   /* erase register xx */
+  eeprom_ewen  = 0x30,   /* erase / write enable */
+  eeprom_ewds  = 0x00,   /* erase / write disable */
+  eeprom_eral  = 0x20,   /* erase all registers */
+  eeprom_wral  = 0x10,   /* write all registers */
+  eeprom_amask = 0x0f,
+  eeprom_imask = 0xf0
+} eeprom_instruction_t;
+#endif
+
+#ifdef DEBUG_EEPROM
+static const char *opstring[] = {
+  "extended", "write", "read", "erase"
+};
+#endif
+
+struct _eeprom_t {
+    uint8_t  tick;
+    uint8_t  address;
+    uint8_t  command;
+    uint8_t  writable;
+
+    uint8_t eecs;
+    uint8_t eesk;
+    uint8_t eedo;
+
+    uint8_t  addrbits;
+    uint16_t size;
+    uint16_t data;
+    uint16_t contents[0];
+};
+
+/* Code for saving and restoring of EEPROM state. */
+
+/* Restore an uint16_t from an uint8_t
+   This is a Big hack, but it is how the old state did it.
+ */
+
+static int get_uint16_from_uint8(QEMUFile *f, void *pv, size_t size)
+{
+    uint16_t *v = pv;
+    *v = qemu_get_ubyte(f);
+    return 0;
+}
+
+static void put_unused(QEMUFile *f, void *pv, size_t size)
+{
+    fprintf(stderr, "uint16_from_uint8 is used only for backwards compatibility.\n");
+    fprintf(stderr, "Never should be used to write a new state.\n");
+    exit(0);
+}
+
+static const VMStateInfo vmstate_hack_uint16_from_uint8 = {
+    .name = "uint16_from_uint8",
+    .get  = get_uint16_from_uint8,
+    .put  = put_unused,
+};
+
+#define VMSTATE_UINT16_HACK_TEST(_f, _s, _t)                           \
+    VMSTATE_SINGLE_TEST(_f, _s, _t, 0, vmstate_hack_uint16_from_uint8, uint16_t)
+
+static bool is_old_eeprom_version(void *opaque, int version_id)
+{
+    return version_id == OLD_EEPROM_VERSION;
+}
+
+static const VMStateDescription vmstate_eeprom = {
+    .name = "eeprom",
+    .version_id = EEPROM_VERSION,
+    .minimum_version_id = OLD_EEPROM_VERSION,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT8(tick, eeprom_t),
+        VMSTATE_UINT8(address, eeprom_t),
+        VMSTATE_UINT8(command, eeprom_t),
+        VMSTATE_UINT8(writable, eeprom_t),
+
+        VMSTATE_UINT8(eecs, eeprom_t),
+        VMSTATE_UINT8(eesk, eeprom_t),
+        VMSTATE_UINT8(eedo, eeprom_t),
+
+        VMSTATE_UINT8(addrbits, eeprom_t),
+        VMSTATE_UINT16_HACK_TEST(size, eeprom_t, is_old_eeprom_version),
+        VMSTATE_UNUSED_TEST(is_old_eeprom_version, 1),
+        VMSTATE_UINT16_EQUAL_V(size, eeprom_t, EEPROM_VERSION),
+        VMSTATE_UINT16(data, eeprom_t),
+        VMSTATE_VARRAY_UINT16_UNSAFE(contents, eeprom_t, size, 0,
+                                     vmstate_info_uint16, uint16_t),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+void eeprom93xx_write(eeprom_t *eeprom, int eecs, int eesk, int eedi)
+{
+    uint8_t tick = eeprom->tick;
+    uint8_t eedo = eeprom->eedo;
+    uint16_t address = eeprom->address;
+    uint8_t command = eeprom->command;
+
+    logout("CS=%u SK=%u DI=%u DO=%u, tick = %u\n",
+           eecs, eesk, eedi, eedo, tick);
+
+    if (!eeprom->eecs && eecs) {
+        /* Start chip select cycle. */
+        logout("Cycle start, waiting for 1st start bit (0)\n");
+        tick = 0;
+        command = 0x0;
+        address = 0x0;
+    } else if (eeprom->eecs && !eecs) {
+        /* End chip select cycle. This triggers write / erase. */
+        if (eeprom->writable) {
+            uint8_t subcommand = address >> (eeprom->addrbits - 2);
+            if (command == 0 && subcommand == 2) {
+                /* Erase all. */
+                for (address = 0; address < eeprom->size; address++) {
+                    eeprom->contents[address] = 0xffff;
+                }
+            } else if (command == 3) {
+                /* Erase word. */
+                eeprom->contents[address] = 0xffff;
+            } else if (tick >= 2 + 2 + eeprom->addrbits + 16) {
+                if (command == 1) {
+                    /* Write word. */
+                    eeprom->contents[address] &= eeprom->data;
+                } else if (command == 0 && subcommand == 1) {
+                    /* Write all. */
+                    for (address = 0; address < eeprom->size; address++) {
+                        eeprom->contents[address] &= eeprom->data;
+                    }
+                }
+            }
+        }
+        /* Output DO is tristate, read results in 1. */
+        eedo = 1;
+    } else if (eecs && !eeprom->eesk && eesk) {
+        /* Raising edge of clock shifts data in. */
+        if (tick == 0) {
+            /* Wait for 1st start bit. */
+            if (eedi == 0) {
+                logout("Got correct 1st start bit, waiting for 2nd start bit (1)\n");
+                tick++;
+            } else {
+                logout("wrong 1st start bit (is 1, should be 0)\n");
+                tick = 2;
+                //~ assert(!"wrong start bit");
+            }
+        } else if (tick == 1) {
+            /* Wait for 2nd start bit. */
+            if (eedi != 0) {
+                logout("Got correct 2nd start bit, getting command + address\n");
+                tick++;
+            } else {
+                logout("1st start bit is longer than needed\n");
+            }
+        } else if (tick < 2 + 2) {
+            /* Got 2 start bits, transfer 2 opcode bits. */
+            tick++;
+            command <<= 1;
+            if (eedi) {
+                command += 1;
+            }
+        } else if (tick < 2 + 2 + eeprom->addrbits) {
+            /* Got 2 start bits and 2 opcode bits, transfer all address bits. */
+            tick++;
+            address = ((address << 1) | eedi);
+            if (tick == 2 + 2 + eeprom->addrbits) {
+                logout("%s command, address = 0x%02x (value 0x%04x)\n",
+                       opstring[command], address, eeprom->contents[address]);
+                if (command == 2) {
+                    eedo = 0;
+                }
+                address = address % eeprom->size;
+                if (command == 0) {
+                    /* Command code in upper 2 bits of address. */
+                    switch (address >> (eeprom->addrbits - 2)) {
+                    case 0:
+                        logout("write disable command\n");
+                        eeprom->writable = 0;
+                        break;
+                    case 1:
+                        logout("write all command\n");
+                        break;
+                    case 2:
+                        logout("erase all command\n");
+                        break;
+                    case 3:
+                        logout("write enable command\n");
+                        eeprom->writable = 1;
+                        break;
+                    }
+                } else {
+                    /* Read, write or erase word. */
+                    eeprom->data = eeprom->contents[address];
+                }
+            }
+        } else if (tick < 2 + 2 + eeprom->addrbits + 16) {
+            /* Transfer 16 data bits. */
+            tick++;
+            if (command == 2) {
+                /* Read word. */
+                eedo = ((eeprom->data & 0x8000) != 0);
+            }
+            eeprom->data <<= 1;
+            eeprom->data += eedi;
+        } else {
+            logout("additional unneeded tick, not processed\n");
+        }
+    }
+    /* Save status of EEPROM. */
+    eeprom->tick = tick;
+    eeprom->eecs = eecs;
+    eeprom->eesk = eesk;
+    eeprom->eedo = eedo;
+    eeprom->address = address;
+    eeprom->command = command;
+}
+
+uint16_t eeprom93xx_read(eeprom_t *eeprom)
+{
+    /* Return status of pin DO (0 or 1). */
+    logout("CS=%u DO=%u\n", eeprom->eecs, eeprom->eedo);
+    return eeprom->eedo;
+}
+
+#if 0
+void eeprom93xx_reset(eeprom_t *eeprom)
+{
+    /* prepare eeprom */
+    logout("eeprom = 0x%p\n", eeprom);
+    eeprom->tick = 0;
+    eeprom->command = 0;
+}
+#endif
+
+eeprom_t *eeprom93xx_new(DeviceState *dev, uint16_t nwords)
+{
+    /* Add a new EEPROM (with 16, 64 or 256 words). */
+    eeprom_t *eeprom;
+    uint8_t addrbits;
+
+    switch (nwords) {
+    case 16:
+    case 64:
+        addrbits = 6;
+        break;
+    case 128:
+    case 256:
+        addrbits = 8;
+        break;
+    default:
+        assert(!"Unsupported EEPROM size, fallback to 64 words!");
+        nwords = 64;
+        addrbits = 6;
+    }
+
+    eeprom = (eeprom_t *)g_malloc0(sizeof(*eeprom) + nwords * 2);
+    eeprom->size = nwords;
+    eeprom->addrbits = addrbits;
+    /* Output DO is tristate, read results in 1. */
+    eeprom->eedo = 1;
+    logout("eeprom = 0x%p, nwords = %u\n", eeprom, nwords);
+    vmstate_register(dev, 0, &vmstate_eeprom, eeprom);
+    return eeprom;
+}
+
+void eeprom93xx_free(DeviceState *dev, eeprom_t *eeprom)
+{
+    /* Destroy EEPROM. */
+    logout("eeprom = 0x%p\n", eeprom);
+    vmstate_unregister(dev, &vmstate_eeprom, eeprom);
+    g_free(eeprom);
+}
+
+uint16_t *eeprom93xx_data(eeprom_t *eeprom)
+{
+    /* Get EEPROM data array. */
+    return &eeprom->contents[0];
+}
+
+/* eof */