DDC/I2C/SMBus overhaul (incomplete, commit for the night)
This commit is contained in:
RichardG867
496
src/device/i2c.c
Normal file
496
src/device/i2c.c
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@@ -0,0 +1,496 @@
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/*
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* 86Box A hypervisor and IBM PC system emulator that specializes in
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* running old operating systems and software designed for IBM
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* PC systems and compatibles from 1981 through fairly recent
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* system designs based on the PCI bus.
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*
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* This file is part of the 86Box distribution.
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*
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* Implement the I2C bus and its operations.
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*
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*
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*
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* Authors: RichardG, <richardg867@gmail.com>
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*
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* Copyright 2020 RichardG.
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*/
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <wchar.h>
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#define HAVE_STDARG_H
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#include <86box/86box.h>
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#include <86box/i2c.h>
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#define NADDRS 128 /* I2C supports 128 addresses */
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#define MAX(a, b) ((a) > (b) ? (a) : (b))
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typedef struct _i2c_ {
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void (*read_quick)(void *bus, uint8_t addr, void *priv);
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uint8_t (*read_byte)(void *bus, uint8_t addr, void *priv);
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uint8_t (*read_byte_cmd)(void *bus, uint8_t addr, uint8_t cmd, void *priv);
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uint16_t (*read_word_cmd)(void *bus, uint8_t addr, uint8_t cmd, void *priv);
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uint8_t (*read_block_cmd)(void *bus, uint8_t addr, uint8_t cmd, uint8_t *data, uint8_t len, void *priv);
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void (*write_quick)(void *bus, uint8_t addr, void *priv);
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void (*write_byte)(void *bus, uint8_t addr, uint8_t val, void *priv);
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void (*write_byte_cmd)(void *bus, uint8_t addr, uint8_t cmd, uint8_t val, void *priv);
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void (*write_word_cmd)(void *bus, uint8_t addr, uint8_t cmd, uint16_t val, void *priv);
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void (*write_block_cmd)(void *bus, uint8_t addr, uint8_t cmd, uint8_t *data, uint8_t len, void *priv);
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void *priv;
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struct _i2c_ *prev, *next;
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} i2c_t;
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typedef struct {
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char *name;
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i2c_t *devices[NADDRS], *last[NADDRS];
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} i2c_bus_t;
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void *i2c_smbus;
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#define ENABLE_I2C_LOG 1
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#ifdef ENABLE_I2C_LOG
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int i2c_do_log = ENABLE_I2C_LOG;
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static void
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i2c_log(const char *fmt, ...)
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{
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va_list ap;
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if (i2c_do_log) {
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va_start(ap, fmt);
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pclog_ex(fmt, ap);
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va_end(ap);
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}
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}
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#else
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#define i2c_log(fmt, ...)
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#endif
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void *
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i2c_addbus(char *name)
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{
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i2c_bus_t *bus = (i2c_bus_t *) malloc(sizeof(i2c_bus_t));
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memset(bus, 0, sizeof(i2c_bus_t));
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bus->name = name;
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return bus;
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}
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void
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i2c_removebus(void *bus_handle)
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{
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if (!bus_handle)
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return;
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free(bus_handle);
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}
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void
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i2c_sethandler(void *bus_handle, uint8_t base, int size,
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void (*read_quick)(void *bus, uint8_t addr, void *priv),
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uint8_t (*read_byte)(void *bus, uint8_t addr, void *priv),
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uint8_t (*read_byte_cmd)(void *bus, uint8_t addr, uint8_t cmd, void *priv),
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uint16_t (*read_word_cmd)(void *bus, uint8_t addr, uint8_t cmd, void *priv),
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uint8_t (*read_block_cmd)(void *bus, uint8_t addr, uint8_t cmd, uint8_t *data, uint8_t len, void *priv),
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void (*write_quick)(void *bus, uint8_t addr, void *priv),
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void (*write_byte)(void *bus, uint8_t addr, uint8_t val, void *priv),
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void (*write_byte_cmd)(void *bus, uint8_t addr, uint8_t cmd, uint8_t val, void *priv),
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void (*write_word_cmd)(void *bus, uint8_t addr, uint8_t cmd, uint16_t val, void *priv),
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void (*write_block_cmd)(void *bus, uint8_t addr, uint8_t cmd, uint8_t *data, uint8_t len, void *priv),
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void *priv)
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{
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int c;
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i2c_t *p, *q = NULL;
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i2c_bus_t *bus = (i2c_bus_t *) bus_handle;
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if (!bus_handle || ((base + size) >= NADDRS))
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return;
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for (c = 0; c < size; c++) {
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p = bus->last[base + c];
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q = (i2c_t *) malloc(sizeof(i2c_t));
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memset(q, 0, sizeof(i2c_t));
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if (p) {
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p->next = q;
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q->prev = p;
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} else {
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bus->devices[base + c] = q;
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q->prev = NULL;
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}
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q->read_byte = read_byte;
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q->read_byte_cmd = read_byte_cmd;
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q->read_word_cmd = read_word_cmd;
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q->read_block_cmd = read_block_cmd;
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q->write_byte = write_byte;
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q->write_byte_cmd = write_byte_cmd;
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q->write_word_cmd = write_word_cmd;
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q->write_block_cmd = write_block_cmd;
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q->priv = priv;
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q->next = NULL;
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bus->last[base + c] = q;
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}
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}
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void
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i2c_removehandler(void *bus_handle, uint8_t base, int size,
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void (*read_quick)(void *bus, uint8_t addr, void *priv),
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uint8_t (*read_byte)(void *bus, uint8_t addr, void *priv),
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uint8_t (*read_byte_cmd)(void *bus, uint8_t addr, uint8_t cmd, void *priv),
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uint16_t (*read_word_cmd)(void *bus, uint8_t addr, uint8_t cmd, void *priv),
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uint8_t (*read_block_cmd)(void *bus, uint8_t addr, uint8_t cmd, uint8_t *data, uint8_t len, void *priv),
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void (*write_quick)(void *bus, uint8_t addr, void *priv),
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void (*write_byte)(void *bus, uint8_t addr, uint8_t val, void *priv),
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void (*write_byte_cmd)(void *bus, uint8_t addr, uint8_t cmd, uint8_t val, void *priv),
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void (*write_word_cmd)(void *bus, uint8_t addr, uint8_t cmd, uint16_t val, void *priv),
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void (*write_block_cmd)(void *bus, uint8_t addr, uint8_t cmd, uint8_t *data, uint8_t len, void *priv),
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void *priv)
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{
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int c;
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i2c_t *p, *q;
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i2c_bus_t *bus = (i2c_bus_t *) bus_handle;
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if (!bus_handle || ((base + size) >= NADDRS))
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return;
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for (c = 0; c < size; c++) {
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p = bus->devices[base + c];
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if (!p)
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continue;
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while(p) {
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q = p->next;
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if ((p->read_byte == read_byte) && (p->read_byte_cmd == read_byte_cmd) &&
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(p->read_word_cmd == read_word_cmd) && (p->read_block_cmd == read_block_cmd) &&
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(p->write_byte == write_byte) && (p->write_byte_cmd == write_byte_cmd) &&
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(p->write_word_cmd == write_word_cmd) && (p->write_block_cmd == write_block_cmd) &&
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(p->priv == priv)) {
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if (p->prev)
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p->prev->next = p->next;
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else
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bus->devices[base + c] = p->next;
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if (p->next)
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p->next->prev = p->prev;
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else
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bus->last[base + c] = p->prev;
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free(p);
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p = NULL;
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break;
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}
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p = q;
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}
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}
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}
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void
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i2c_handler(int set, void *bus_handle, uint8_t base, int size,
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void (*read_quick)(void *bus, uint8_t addr, void *priv),
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uint8_t (*read_byte)(void *bus, uint8_t addr, void *priv),
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uint8_t (*read_byte_cmd)(void *bus, uint8_t addr, uint8_t cmd, void *priv),
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uint16_t (*read_word_cmd)(void *bus, uint8_t addr, uint8_t cmd, void *priv),
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uint8_t (*read_block_cmd)(void *bus, uint8_t addr, uint8_t cmd, uint8_t *data, uint8_t len, void *priv),
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void (*write_quick)(void *bus, uint8_t addr, void *priv),
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void (*write_byte)(void *bus, uint8_t addr, uint8_t val, void *priv),
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void (*write_byte_cmd)(void *bus, uint8_t addr, uint8_t cmd, uint8_t val, void *priv),
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void (*write_word_cmd)(void *bus, uint8_t addr, uint8_t cmd, uint16_t val, void *priv),
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void (*write_block_cmd)(void *bus, uint8_t addr, uint8_t cmd, uint8_t *data, uint8_t len, void *priv),
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void *priv)
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{
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if (set)
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i2c_sethandler(bus_handle, base, size, read_quick, read_byte, read_byte_cmd, read_word_cmd, read_block_cmd, write_quick, write_byte, write_byte_cmd, write_word_cmd, write_block_cmd, priv);
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else
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i2c_removehandler(bus_handle, base, size, read_quick, read_byte, read_byte_cmd, read_word_cmd, read_block_cmd, write_quick, write_byte, write_byte_cmd, write_word_cmd, write_block_cmd, priv);
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}
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uint8_t
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i2c_has_device(void *bus_handle, uint8_t addr)
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{
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i2c_bus_t *bus = (i2c_bus_t *) bus_handle;
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if (!bus)
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return 0;
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return(!!bus->devices[addr]);
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}
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void
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i2c_read_quick(void *bus_handle, uint8_t addr)
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{
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i2c_bus_t *bus = (i2c_bus_t *) bus_handle;
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i2c_t *p;
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int found = 0;
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if (!bus)
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return;
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p = bus->devices[addr];
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if (p) {
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while(p) {
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if (p->read_byte) {
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p->read_quick(bus_handle, addr, p->priv);
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found++;
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}
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p = p->next;
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}
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}
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i2c_log("I2C: read_quick(%s, %02X)\n", bus->name, addr);
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}
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uint8_t
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i2c_read_byte(void *bus_handle, uint8_t addr)
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{
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uint8_t ret = 0xff;
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i2c_bus_t *bus = (i2c_bus_t *) bus_handle;
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i2c_t *p;
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int found = 0;
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if (!bus)
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return(ret);
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p = bus->devices[addr];
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if (p) {
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while(p) {
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if (p->read_byte) {
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ret &= p->read_byte(bus_handle, addr, p->priv);
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found++;
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}
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p = p->next;
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}
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}
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i2c_log("I2C: read_byte(%s, %02X) = %02X\n", bus->name, addr, ret);
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return(ret);
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}
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uint8_t
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i2c_read_byte_cmd(void *bus_handle, uint8_t addr, uint8_t cmd)
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{
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uint8_t ret = 0xff;
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i2c_bus_t *bus = (i2c_bus_t *) bus_handle;
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i2c_t *p;
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int found = 0;
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if (!bus)
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return(ret);
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p = bus->devices[addr];
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if (p) {
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while(p) {
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if (p->read_byte_cmd) {
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ret &= p->read_byte_cmd(bus_handle, addr, cmd, p->priv);
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found++;
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}
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p = p->next;
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}
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}
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i2c_log("I2C: read_byte_cmd(%s, %02X, %02X) = %02X\n", bus->name, addr, cmd, ret);
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return(ret);
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}
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uint16_t
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i2c_read_word_cmd(void *bus_handle, uint8_t addr, uint8_t cmd)
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{
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uint16_t ret = 0xffff;
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i2c_bus_t *bus = (i2c_bus_t *) bus_handle;
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i2c_t *p;
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int found = 0;
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if (!bus)
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return(ret);
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p = bus->devices[addr];
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if (p) {
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while(p) {
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if (p->read_word_cmd) {
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ret &= p->read_word_cmd(bus_handle, addr, cmd, p->priv);
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found++;
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}
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p = p->next;
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}
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}
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i2c_log("I2C: read_word_cmd(%s, %02X, %02X) = %04X\n", bus->name, addr, cmd, ret);
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return(ret);
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}
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uint8_t
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i2c_read_block_cmd(void *bus_handle, uint8_t addr, uint8_t cmd, uint8_t *data, uint8_t len)
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{
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uint8_t ret = 0;
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i2c_bus_t *bus = (i2c_bus_t *) bus_handle;
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i2c_t *p;
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int found = 0;
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if (!bus)
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return(ret);
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p = bus->devices[addr];
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if (p) {
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||||
while(p) {
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if (p->read_block_cmd) {
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ret = MAX(ret, p->read_block_cmd(bus_handle, addr, cmd, data, len, p->priv));
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found++;
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||||
}
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p = p->next;
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||||
}
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||||
}
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||||
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||||
i2c_log("I2C: read_block_cmd(%s, %02X, %02X) = %02X\n", bus->name, addr, cmd, len);
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||||
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||||
return(ret);
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}
|
||||
|
||||
|
||||
void
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||||
i2c_write_quick(void *bus_handle, uint8_t addr)
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||||
{
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||||
i2c_bus_t *bus = (i2c_bus_t *) bus_handle;
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i2c_t *p;
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||||
int found = 0;
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||||
|
||||
if (!bus)
|
||||
return;
|
||||
|
||||
p = bus->devices[addr];
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||||
if (p) {
|
||||
while(p) {
|
||||
if (p->read_byte) {
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||||
p->write_quick(bus_handle, addr, p->priv);
|
||||
found++;
|
||||
}
|
||||
p = p->next;
|
||||
}
|
||||
}
|
||||
|
||||
i2c_log("I2C: write_quick(%s, %02X)\n", bus->name, addr);
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
i2c_write_byte(void *bus_handle, uint8_t addr, uint8_t val)
|
||||
{
|
||||
i2c_t *p;
|
||||
i2c_bus_t *bus = (i2c_bus_t *) bus_handle;
|
||||
int found = 0;
|
||||
|
||||
if (!bus)
|
||||
return;
|
||||
|
||||
if (bus->devices[addr]) {
|
||||
p = bus->devices[addr];
|
||||
while(p) {
|
||||
if (p->write_byte) {
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||||
p->write_byte(bus_handle, addr, val, p->priv);
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||||
found++;
|
||||
}
|
||||
p = p->next;
|
||||
}
|
||||
}
|
||||
|
||||
i2c_log("I2C: write_byte(%s, %02X, %02X)\n", bus->name, addr, val);
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
void
|
||||
i2c_write_byte_cmd(void *bus_handle, uint8_t addr, uint8_t cmd, uint8_t val)
|
||||
{
|
||||
i2c_t *p;
|
||||
i2c_bus_t *bus = (i2c_bus_t *) bus_handle;
|
||||
int found = 0;
|
||||
|
||||
if (!bus)
|
||||
return;
|
||||
|
||||
if (bus->devices[addr]) {
|
||||
p = bus->devices[addr];
|
||||
while(p) {
|
||||
if (p->write_byte_cmd) {
|
||||
p->write_byte_cmd(bus_handle, addr, cmd, val, p->priv);
|
||||
found++;
|
||||
}
|
||||
p = p->next;
|
||||
}
|
||||
}
|
||||
|
||||
i2c_log("I2C: write_byte_cmd(%s, %02X, %02X, %02X)\n", bus->name, addr, cmd, val);
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
void
|
||||
i2c_write_word_cmd(void *bus_handle, uint8_t addr, uint8_t cmd, uint16_t val)
|
||||
{
|
||||
i2c_t *p;
|
||||
i2c_bus_t *bus = (i2c_bus_t *) bus_handle;
|
||||
int found = 0;
|
||||
|
||||
if (!bus)
|
||||
return;
|
||||
|
||||
if (bus->devices[addr]) {
|
||||
p = bus->devices[addr];
|
||||
while(p) {
|
||||
if (p->write_word_cmd) {
|
||||
p->write_word_cmd(bus_handle, addr, cmd, val, p->priv);
|
||||
found++;
|
||||
}
|
||||
p = p->next;
|
||||
}
|
||||
}
|
||||
|
||||
i2c_log("I2C: write_word_cmd(%s, %02X, %02X, %04X)\n", bus->name, addr, cmd, val);
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
void
|
||||
i2c_write_block_cmd(void *bus_handle, uint8_t addr, uint8_t cmd, uint8_t *data, uint8_t len)
|
||||
{
|
||||
i2c_t *p;
|
||||
i2c_bus_t *bus = (i2c_bus_t *) bus_handle;
|
||||
int found = 0;
|
||||
|
||||
if (!bus)
|
||||
return;
|
||||
|
||||
p = bus->devices[addr];
|
||||
if (p) {
|
||||
while(p) {
|
||||
if (p->write_block_cmd) {
|
||||
p->write_block_cmd(bus_handle, addr, cmd, data, len, p->priv);
|
||||
found++;
|
||||
}
|
||||
p = p->next;
|
||||
}
|
||||
}
|
||||
|
||||
i2c_log("I2C: write_block_cmd(%s, %02X, %02X, %02X)\n", bus->name, addr, cmd, len);
|
||||
|
||||
return;
|
||||
}
|
||||
Reference in New Issue
Block a user