mirror of https://github.com/proxmox/mirror_qemu
173 lines
4.1 KiB
C
173 lines
4.1 KiB
C
/*
|
|
* 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 <glib.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;
|
|
}
|