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/*
* QTest I2C driver
*
* Copyright (c) 2012 Andreas Färber
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "libqos/i2c.h"
#include "qemu/bswap.h"
#include "libqtest.h"
enum OMAPI2CRegisters {
OMAP_I2C_REV = 0x00,
OMAP_I2C_STAT = 0x08,
OMAP_I2C_CNT = 0x18,
OMAP_I2C_DATA = 0x1c,
OMAP_I2C_CON = 0x24,
OMAP_I2C_SA = 0x2c,
};
enum OMAPI2CSTATBits {
OMAP_I2C_STAT_NACK = 1 << 1,
OMAP_I2C_STAT_ARDY = 1 << 2,
OMAP_I2C_STAT_RRDY = 1 << 3,
OMAP_I2C_STAT_XRDY = 1 << 4,
OMAP_I2C_STAT_ROVR = 1 << 11,
OMAP_I2C_STAT_SBD = 1 << 15,
};
enum OMAPI2CCONBits {
OMAP_I2C_CON_STT = 1 << 0,
OMAP_I2C_CON_STP = 1 << 1,
OMAP_I2C_CON_TRX = 1 << 9,
OMAP_I2C_CON_MST = 1 << 10,
OMAP_I2C_CON_BE = 1 << 14,
OMAP_I2C_CON_I2C_EN = 1 << 15,
};
typedef struct OMAPI2C {
I2CAdapter parent;
uint64_t addr;
} OMAPI2C;
static void omap_i2c_set_slave_addr(OMAPI2C *s, uint8_t addr)
{
uint16_t data = addr;
writew(s->addr + OMAP_I2C_SA, data);
data = readw(s->addr + OMAP_I2C_SA);
g_assert_cmphex(data, ==, addr);
}
static void omap_i2c_send(I2CAdapter *i2c, uint8_t addr,
const uint8_t *buf, uint16_t len)
{
OMAPI2C *s = (OMAPI2C *)i2c;
uint16_t data;
omap_i2c_set_slave_addr(s, addr);
data = len;
writew(s->addr + OMAP_I2C_CNT, data);
data = OMAP_I2C_CON_I2C_EN |
OMAP_I2C_CON_TRX |
OMAP_I2C_CON_MST |
OMAP_I2C_CON_STT |
OMAP_I2C_CON_STP;
writew(s->addr + OMAP_I2C_CON, data);
data = readw(s->addr + OMAP_I2C_CON);
g_assert((data & OMAP_I2C_CON_STP) != 0);
data = readw(s->addr + OMAP_I2C_STAT);
g_assert((data & OMAP_I2C_STAT_NACK) == 0);
while (len > 1) {
data = readw(s->addr + OMAP_I2C_STAT);
g_assert((data & OMAP_I2C_STAT_XRDY) != 0);
data = buf[0] | ((uint16_t)buf[1] << 8);
writew(s->addr + OMAP_I2C_DATA, data);
buf = (uint8_t *)buf + 2;
len -= 2;
}
if (len == 1) {
data = readw(s->addr + OMAP_I2C_STAT);
g_assert((data & OMAP_I2C_STAT_XRDY) != 0);
data = buf[0];
writew(s->addr + OMAP_I2C_DATA, data);
}
data = readw(s->addr + OMAP_I2C_CON);
g_assert((data & OMAP_I2C_CON_STP) == 0);
}
static void omap_i2c_recv(I2CAdapter *i2c, uint8_t addr,
uint8_t *buf, uint16_t len)
{
OMAPI2C *s = (OMAPI2C *)i2c;
uint16_t data, stat;
omap_i2c_set_slave_addr(s, addr);
data = len;
writew(s->addr + OMAP_I2C_CNT, data);
data = OMAP_I2C_CON_I2C_EN |
OMAP_I2C_CON_MST |
OMAP_I2C_CON_STT |
OMAP_I2C_CON_STP;
writew(s->addr + OMAP_I2C_CON, data);
data = readw(s->addr + OMAP_I2C_CON);
g_assert((data & OMAP_I2C_CON_STP) == 0);
data = readw(s->addr + OMAP_I2C_STAT);
g_assert((data & OMAP_I2C_STAT_NACK) == 0);
data = readw(s->addr + OMAP_I2C_CNT);
g_assert_cmpuint(data, ==, len);
while (len > 0) {
data = readw(s->addr + OMAP_I2C_STAT);
g_assert((data & OMAP_I2C_STAT_RRDY) != 0);
g_assert((data & OMAP_I2C_STAT_ROVR) == 0);
data = readw(s->addr + OMAP_I2C_DATA);
stat = readw(s->addr + OMAP_I2C_STAT);
if (unlikely(len == 1)) {
g_assert((stat & OMAP_I2C_STAT_SBD) != 0);
buf[0] = data & 0xff;
buf++;
len--;
} else {
buf[0] = data & 0xff;
buf[1] = data >> 8;
buf += 2;
len -= 2;
}
}
data = readw(s->addr + OMAP_I2C_CON);
g_assert((data & OMAP_I2C_CON_STP) == 0);
}
I2CAdapter *omap_i2c_create(uint64_t addr)
{
OMAPI2C *s = g_malloc0(sizeof(*s));
I2CAdapter *i2c = (I2CAdapter *)s;
uint16_t data;
s->addr = addr;
i2c->send = omap_i2c_send;
i2c->recv = omap_i2c_recv;
/* verify the mmio address by looking for a known signature */
data = readw(addr + OMAP_I2C_REV);
g_assert_cmphex(data, ==, 0x34);
return i2c;
}
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