From 49ab747f668f421138d5b40d83fa279c4c5e278d Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Fri, 1 Mar 2013 13:59:19 +0100 Subject: hw: move target-independent files to subdirectories This patch tackles all files that are compiled once, moving them to subdirectories of hw/. Signed-off-by: Paolo Bonzini --- hw/nvram/eeprom93xx.c | 337 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 337 insertions(+) create mode 100644 hw/nvram/eeprom93xx.c (limited to 'hw/nvram/eeprom93xx.c') diff --git a/hw/nvram/eeprom93xx.c b/hw/nvram/eeprom93xx.c new file mode 100644 index 0000000000..08f4df586c --- /dev/null +++ b/hw/nvram/eeprom93xx.c @@ -0,0 +1,337 @@ +/* + * 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 . + */ + +/* 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, + .minimum_version_id_old = 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 */ -- cgit v1.2.1