24C01 / 24C02 EEPROM emulation for Malta, by Stefan Weil.
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2458 c046a42c-6fe2-441c-8c8c-71466251a162
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129
hw/mips_malta.c
129
hw/mips_malta.c
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@ -49,6 +49,7 @@ typedef struct {
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uint32_t leds;
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uint32_t brk;
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uint32_t gpout;
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uint32_t i2cin;
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uint32_t i2coe;
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uint32_t i2cout;
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uint32_t i2csel;
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@ -83,6 +84,124 @@ static void malta_fpga_update_display(void *opaque)
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qemu_chr_printf(s->display, "\n\n\n\n|\e[31m%-8.8s\e[00m|", s->display_text);
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}
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/*
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* EEPROM 24C01 / 24C02 emulation.
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*
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* Emulation for serial EEPROMs:
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* 24C01 - 1024 bit (128 x 8)
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* 24C02 - 2048 bit (256 x 8)
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*
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* Typical device names include Microchip 24C02SC or SGS Thomson ST24C02.
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*/
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//~ #define DEBUG
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#if defined(DEBUG)
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# define logout(fmt, args...) fprintf(stderr, "MALTA\t%-24s" fmt, __func__, ##args)
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#else
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# define logout(fmt, args...) ((void)0)
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#endif
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struct _eeprom24c0x_t {
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uint8_t tick;
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uint8_t address;
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uint8_t command;
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uint8_t ack;
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uint8_t scl;
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uint8_t sda;
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uint8_t data;
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//~ uint16_t size;
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uint8_t contents[256];
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};
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typedef struct _eeprom24c0x_t eeprom24c0x_t;
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static eeprom24c0x_t eeprom = {
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contents: {
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/* 00000000: */ 0x80,0x08,0x04,0x0D,0x0A,0x01,0x40,0x00,
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/* 00000008: */ 0x01,0x75,0x54,0x00,0x82,0x08,0x00,0x01,
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/* 00000010: */ 0x8F,0x04,0x02,0x01,0x01,0x00,0x0E,0x00,
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/* 00000018: */ 0x00,0x00,0x00,0x14,0x0F,0x14,0x2D,0x40,
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/* 00000020: */ 0x15,0x08,0x15,0x08,0x00,0x00,0x00,0x00,
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/* 00000028: */ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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/* 00000030: */ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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/* 00000038: */ 0x00,0x00,0x00,0x00,0x00,0x00,0x12,0xD0,
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/* 00000040: */ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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/* 00000048: */ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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/* 00000050: */ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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/* 00000058: */ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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/* 00000060: */ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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/* 00000068: */ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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/* 00000070: */ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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/* 00000078: */ 0x00,0x00,0x00,0x00,0x00,0x00,0x64,0xF4,
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},
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};
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static uint8_t eeprom24c0x_read()
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{
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logout("%u: scl = %u, sda = %u, data = 0x%02x\n",
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eeprom.tick, eeprom.scl, eeprom.sda, eeprom.data);
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return eeprom.sda;
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}
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static void eeprom24c0x_write(int scl, int sda)
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{
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if (eeprom.scl && scl && (eeprom.sda != sda)) {
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logout("%u: scl = %u->%u, sda = %u->%u i2c %s\n",
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eeprom.tick, eeprom.scl, scl, eeprom.sda, sda, sda ? "stop" : "start");
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if (!sda) {
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eeprom.tick = 1;
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eeprom.command = 0;
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}
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} else if (eeprom.tick == 0 && !eeprom.ack) {
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/* Waiting for start. */
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logout("%u: scl = %u->%u, sda = %u->%u wait for i2c start\n",
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eeprom.tick, eeprom.scl, scl, eeprom.sda, sda);
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} else if (!eeprom.scl && scl) {
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logout("%u: scl = %u->%u, sda = %u->%u trigger bit\n",
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eeprom.tick, eeprom.scl, scl, eeprom.sda, sda);
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if (eeprom.ack) {
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logout("\ti2c ack bit = 0\n");
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sda = 0;
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eeprom.ack = 0;
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} else if (eeprom.sda == sda) {
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uint8_t bit = (sda != 0);
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logout("\ti2c bit = %d\n", bit);
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if (eeprom.tick < 9) {
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eeprom.command <<= 1;
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eeprom.command += bit;
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eeprom.tick++;
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if (eeprom.tick == 9) {
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logout("\tcommand 0x%04x, %s\n", eeprom.command, bit ? "read" : "write");
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eeprom.ack = 1;
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}
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} else if (eeprom.tick < 17) {
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if (eeprom.command & 1) {
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sda = ((eeprom.data & 0x80) != 0);
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}
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eeprom.address <<= 1;
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eeprom.address += bit;
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eeprom.tick++;
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eeprom.data <<= 1;
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if (eeprom.tick == 17) {
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eeprom.data = eeprom.contents[eeprom.address];
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logout("\taddress 0x%04x, data 0x%02x\n", eeprom.address, eeprom.data);
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eeprom.ack = 1;
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eeprom.tick = 0;
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}
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} else if (eeprom.tick >= 17) {
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sda = 0;
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}
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} else {
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logout("\tsda changed with raising scl\n");
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}
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} else {
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logout("%u: scl = %u->%u, sda = %u->%u\n", eeprom.tick, eeprom.scl, scl, eeprom.sda, sda);
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}
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eeprom.scl = scl;
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eeprom.sda = sda;
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}
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static uint32_t malta_fpga_readl(void *opaque, target_phys_addr_t addr)
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{
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MaltaFPGAState *s = opaque;
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@ -140,7 +259,7 @@ static uint32_t malta_fpga_readl(void *opaque, target_phys_addr_t addr)
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/* I2CINP Register */
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case 0x00b00:
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val = 0x00000003;
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val = ((s->i2cin & ~1) | eeprom24c0x_read());
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break;
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/* I2COE Register */
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@ -155,7 +274,7 @@ static uint32_t malta_fpga_readl(void *opaque, target_phys_addr_t addr)
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/* I2CSEL Register */
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case 0x00b18:
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val = s->i2cout;
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val = s->i2csel;
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break;
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default:
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@ -234,12 +353,13 @@ static void malta_fpga_writel(void *opaque, target_phys_addr_t addr,
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/* I2COUT Register */
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case 0x00b10:
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s->i2cout = val & 0x03;
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eeprom24c0x_write(val & 0x02, val & 0x01);
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s->i2cout = val;
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break;
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/* I2CSEL Register */
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case 0x00b18:
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s->i2cout = val & 0x01;
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s->i2csel = val & 0x01;
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break;
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default:
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@ -270,6 +390,7 @@ void malta_fpga_reset(void *opaque)
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s->leds = 0x00;
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s->brk = 0x0a;
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s->gpout = 0x00;
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s->i2cin = 0x3;
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s->i2coe = 0x0;
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s->i2cout = 0x3;
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s->i2csel = 0x1;
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