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libqtest: Prepare I2C libqos

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This adds a simple I2C API and a driver implementation for omap_i2c.

Signed-off-by: Andreas Färber <andreas.faerber@web.de>
Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Andreas Färber 2013-01-16 01:57:54 +01:00 committed by Anthony Liguori
parent 457b654327
commit 2bf7b4572b
4 changed files with 219 additions and 0 deletions
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1
tests/Makefile
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@ -116,6 +116,7 @@ QTEST_TARGETS=$(foreach TARGET,$(TARGETS), $(if $(check-qtest-$(TARGET)-y), $(TA
check-qtest-$(CONFIG_POSIX)=$(foreach TARGET,$(TARGETS), $(check-qtest-$(TARGET)-y))
qtest-obj-y = tests/libqtest.o libqemuutil.a libqemustub.a
qtest-obj-y += tests/libi2c.o tests/libi2c-omap.o
$(check-qtest-y): $(qtest-obj-y)
.PHONY: check-help

166
tests/libi2c-omap.c Normal file
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@ -0,0 +1,166 @@
/*
* 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 "libi2c.h"
#include <glib.h>
#include <string.h>
#include "qemu/osdep.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;
memwrite(s->addr + OMAP_I2C_SA, &data, 2);
memread(s->addr + OMAP_I2C_SA, &data, 2);
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;
memwrite(s->addr + OMAP_I2C_CNT, &data, 2);
data = OMAP_I2C_CON_I2C_EN |
OMAP_I2C_CON_TRX |
OMAP_I2C_CON_MST |
OMAP_I2C_CON_STT |
OMAP_I2C_CON_STP;
memwrite(s->addr + OMAP_I2C_CON, &data, 2);
memread(s->addr + OMAP_I2C_CON, &data, 2);
g_assert((data & OMAP_I2C_CON_STP) != 0);
memread(s->addr + OMAP_I2C_STAT, &data, 2);
g_assert((data & OMAP_I2C_STAT_NACK) == 0);
while (len > 1) {
memread(s->addr + OMAP_I2C_STAT, &data, 2);
g_assert((data & OMAP_I2C_STAT_XRDY) != 0);
memwrite(s->addr + OMAP_I2C_DATA, buf, 2);
buf = (uint8_t *)buf + 2;
len -= 2;
}
if (len == 1) {
memread(s->addr + OMAP_I2C_STAT, &data, 2);
g_assert((data & OMAP_I2C_STAT_XRDY) != 0);
memwrite(s->addr + OMAP_I2C_DATA, buf, 1);
}
memread(s->addr + OMAP_I2C_CON, &data, 2);
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;
memwrite(s->addr + OMAP_I2C_CNT, &data, 2);
data = OMAP_I2C_CON_I2C_EN |
OMAP_I2C_CON_MST |
OMAP_I2C_CON_STT |
OMAP_I2C_CON_STP;
memwrite(s->addr + OMAP_I2C_CON, &data, 2);
memread(s->addr + OMAP_I2C_CON, &data, 2);
g_assert((data & OMAP_I2C_CON_STP) == 0);
memread(s->addr + OMAP_I2C_STAT, &data, 2);
g_assert((data & OMAP_I2C_STAT_NACK) == 0);
memread(s->addr + OMAP_I2C_CNT, &data, 2);
g_assert_cmpuint(data, ==, len);
while (len > 0) {
memread(s->addr + OMAP_I2C_STAT, &data, 2);
g_assert((data & OMAP_I2C_STAT_RRDY) != 0);
g_assert((data & OMAP_I2C_STAT_ROVR) == 0);
memread(s->addr + OMAP_I2C_DATA, &data, 2);
memread(s->addr + OMAP_I2C_STAT, &stat, 2);
if (unlikely(len == 1)) {
*buf = data & 0xf;
buf++;
len--;
} else {
memcpy(buf, &data, 2);
buf += 2;
len -= 2;
}
}
memread(s->addr + OMAP_I2C_CON, &data, 2);
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 */
memread(addr + OMAP_I2C_REV, &data, 2);
g_assert_cmphex(data, ==, 0x34);
return i2c;
}

22
tests/libi2c.c Normal file
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@ -0,0 +1,22 @@
/*
* 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 "libi2c.h"
#include "libqtest.h"
void i2c_send(I2CAdapter *i2c, uint8_t addr,
const uint8_t *buf, uint16_t len)
{
i2c->send(i2c, addr, buf, len);
}
void i2c_recv(I2CAdapter *i2c, uint8_t addr,
uint8_t *buf, uint16_t len)
{
i2c->recv(i2c, addr, buf, len);
}

30
tests/libi2c.h Normal file
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@ -0,0 +1,30 @@
/*
* I2C libqos
*
* 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.
*/
#ifndef LIBQOS_I2C_H
#define LIBQOS_I2C_H
#include <stdint.h>
typedef struct I2CAdapter I2CAdapter;
struct I2CAdapter {
void (*send)(I2CAdapter *adapter, uint8_t addr,
const uint8_t *buf, uint16_t len);
void (*recv)(I2CAdapter *adapter, uint8_t addr,
uint8_t *buf, uint16_t len);
};
void i2c_send(I2CAdapter *i2c, uint8_t addr,
const uint8_t *buf, uint16_t len);
void i2c_recv(I2CAdapter *i2c, uint8_t addr,
uint8_t *buf, uint16_t len);
/* libi2c-omap.c */
I2CAdapter *omap_i2c_create(uint64_t addr);
#endif