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qemu/tests/qtest/max34451-test.c
Titus Rwantare ff0511282d hw/i2c: pmbus: reset page register for out of range reads 
The linux pmbus driver scans all possible pages and does not reset the
current page after the scan, making all future page reads fail as out of range
on devices with a single page.

This change resets out of range pages immediately on write.

Also added a qtest for simultaneous writes to all pages.

Reviewed-by: Hao Wu <wuhaotsh@google.com>
Signed-off-by: Titus Rwantare <titusr@google.com>
Message-ID: <20231023-staging-pmbus-v3-v4-8-07a8cb7cd20a@google.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
2023-11-07 13:08:49 +01:00

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/*
* QTests for the MAX34451 device
*
* Copyright 2021 Google LLC
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "hw/i2c/pmbus_device.h"
#include "libqtest-single.h"
#include "libqos/qgraph.h"
#include "libqos/i2c.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qnum.h"
#include "qemu/bitops.h"
#define TEST_ID "max34451-test"
#define TEST_ADDR (0x4e)
#define MAX34451_MFR_MODE 0xD1
#define MAX34451_MFR_VOUT_PEAK 0xD4
#define MAX34451_MFR_IOUT_PEAK 0xD5
#define MAX34451_MFR_TEMPERATURE_PEAK 0xD6
#define MAX34451_MFR_VOUT_MIN 0xD7
#define DEFAULT_VOUT 0
#define DEFAULT_UV_LIMIT 0
#define DEFAULT_TEMPERATURE 2500
#define DEFAULT_SCALE 0x7FFF
#define DEFAULT_OV_LIMIT 0x7FFF
#define DEFAULT_OC_LIMIT 0x7FFF
#define DEFAULT_OT_LIMIT 0x7FFF
#define DEFAULT_VMIN 0x7FFF
#define DEFAULT_TON_FAULT_LIMIT 0xFFFF
#define DEFAULT_CHANNEL_CONFIG 0x20
#define DEFAULT_TEXT 0x20
#define MAX34451_NUM_PWR_DEVICES 16
#define MAX34451_NUM_TEMP_DEVICES 5
static uint16_t qmp_max34451_get(const char *id, const char *property)
{
QDict *response;
uint16_t ret;
response = qmp("{ 'execute': 'qom-get', 'arguments': { 'path': %s, "
"'property': %s } }", id, property);
g_assert(qdict_haskey(response, "return"));
ret = qnum_get_uint(qobject_to(QNum, qdict_get(response, "return")));
qobject_unref(response);
return ret;
}
static void qmp_max34451_set(const char *id,
const char *property,
uint16_t value)
{
QDict *response;
response = qmp("{ 'execute': 'qom-set', 'arguments': { 'path': %s, "
"'property': %s, 'value': %u } }",
id, property, value);
g_assert(qdict_haskey(response, "return"));
qobject_unref(response);
}
/* PMBus commands are little endian vs i2c_set16 in i2c.h which is big endian */
static uint16_t max34451_i2c_get16(QI2CDevice *i2cdev, uint8_t reg)
{
uint8_t resp[2];
i2c_read_block(i2cdev, reg, resp, sizeof(resp));
return (resp[1] << 8) | resp[0];
}
/* PMBus commands are little endian vs i2c_set16 in i2c.h which is big endian */
static void max34451_i2c_set16(QI2CDevice *i2cdev, uint8_t reg, uint16_t value)
{
uint8_t data[2];
data[0] = value & 255;
data[1] = value >> 8;
i2c_write_block(i2cdev, reg, data, sizeof(data));
}
/* Test default values */
static void test_defaults(void *obj, void *data, QGuestAllocator *alloc)
{
uint16_t value, i2c_value;
QI2CDevice *i2cdev = (QI2CDevice *)obj;
char *path;
/* Default temperatures and temperature fault limits */
for (int i = 0; i < MAX34451_NUM_TEMP_DEVICES; i++) {
path = g_strdup_printf("temperature[%d]", i);
value = qmp_max34451_get(TEST_ID, path);
g_assert_cmpuint(value, ==, DEFAULT_TEMPERATURE);
g_free(path);
/* Temperature sensors start on page 16 */
i2c_set8(i2cdev, PMBUS_PAGE, i + 16);
i2c_value = max34451_i2c_get16(i2cdev, PMBUS_READ_TEMPERATURE_1);
g_assert_cmpuint(i2c_value, ==, DEFAULT_TEMPERATURE);
i2c_value = max34451_i2c_get16(i2cdev, PMBUS_OT_FAULT_LIMIT);
g_assert_cmpuint(i2c_value, ==, DEFAULT_OT_LIMIT);
i2c_value = max34451_i2c_get16(i2cdev, PMBUS_OT_WARN_LIMIT);
g_assert_cmpuint(i2c_value, ==, DEFAULT_OT_LIMIT);
}
/* Default voltages and fault limits */
for (int i = 0; i < MAX34451_NUM_PWR_DEVICES; i++) {
path = g_strdup_printf("vout[%d]", i);
value = qmp_max34451_get(TEST_ID, path);
g_assert_cmpuint(value, ==, DEFAULT_VOUT);
g_free(path);
i2c_set8(i2cdev, PMBUS_PAGE, i);
i2c_value = max34451_i2c_get16(i2cdev, PMBUS_READ_VOUT);
g_assert_cmpuint(i2c_value, ==, DEFAULT_VOUT);
i2c_value = max34451_i2c_get16(i2cdev, PMBUS_VOUT_OV_FAULT_LIMIT);
g_assert_cmpuint(i2c_value, ==, DEFAULT_OV_LIMIT);
i2c_value = max34451_i2c_get16(i2cdev, PMBUS_VOUT_OV_WARN_LIMIT);
g_assert_cmpuint(i2c_value, ==, DEFAULT_OV_LIMIT);
i2c_value = max34451_i2c_get16(i2cdev, PMBUS_VOUT_UV_WARN_LIMIT);
g_assert_cmpuint(i2c_value, ==, DEFAULT_UV_LIMIT);
i2c_value = max34451_i2c_get16(i2cdev, PMBUS_VOUT_UV_FAULT_LIMIT);
g_assert_cmpuint(i2c_value, ==, DEFAULT_UV_LIMIT);
i2c_value = max34451_i2c_get16(i2cdev, MAX34451_MFR_VOUT_MIN);
g_assert_cmpuint(i2c_value, ==, DEFAULT_VMIN);
}
i2c_value = i2c_get8(i2cdev, PMBUS_VOUT_MODE);
g_assert_cmphex(i2c_value, ==, 0x40); /* DIRECT mode */
i2c_value = i2c_get8(i2cdev, PMBUS_REVISION);
g_assert_cmphex(i2c_value, ==, 0x11); /* Rev 1.1 */
}
/* Test setting temperature */
static void test_temperature(void *obj, void *data, QGuestAllocator *alloc)
{
uint16_t value, i2c_value;
QI2CDevice *i2cdev = (QI2CDevice *)obj;
char *path;
for (int i = 0; i < MAX34451_NUM_TEMP_DEVICES; i++) {
path = g_strdup_printf("temperature[%d]", i);
qmp_max34451_set(TEST_ID, path, 0xBE00 + i);
value = qmp_max34451_get(TEST_ID, path);
g_assert_cmphex(value, ==, 0xBE00 + i);
g_free(path);
}
/* compare qmp read with i2c read separately */
for (int i = 0; i < MAX34451_NUM_TEMP_DEVICES; i++) {
/* temperature[0] is on page 16 */
i2c_set8(i2cdev, PMBUS_PAGE, i + 16);
i2c_value = max34451_i2c_get16(i2cdev, PMBUS_READ_TEMPERATURE_1);
g_assert_cmphex(i2c_value, ==, 0xBE00 + i);
i2c_value = max34451_i2c_get16(i2cdev, MAX34451_MFR_TEMPERATURE_PEAK);
g_assert_cmphex(i2c_value, ==, 0xBE00 + i);
}
}
/* Test setting voltage */
static void test_voltage(void *obj, void *data, QGuestAllocator *alloc)
{
uint16_t value, i2c_value;
QI2CDevice *i2cdev = (QI2CDevice *)obj;
char *path;
for (int i = 0; i < MAX34451_NUM_PWR_DEVICES; i++) {
path = g_strdup_printf("vout[%d]", i);
qmp_max34451_set(TEST_ID, path, 3000 + i);
value = qmp_max34451_get(TEST_ID, path);
g_assert_cmpuint(value, ==, 3000 + i);
g_free(path);
}
/* compare qmp read with i2c read separately */
for (int i = 0; i < MAX34451_NUM_PWR_DEVICES; i++) {
i2c_set8(i2cdev, PMBUS_PAGE, i);
i2c_value = max34451_i2c_get16(i2cdev, PMBUS_READ_VOUT);
g_assert_cmpuint(i2c_value, ==, 3000 + i);
i2c_value = max34451_i2c_get16(i2cdev, MAX34451_MFR_VOUT_PEAK);
g_assert_cmpuint(i2c_value, ==, 3000 + i);
i2c_value = max34451_i2c_get16(i2cdev, MAX34451_MFR_VOUT_MIN);
g_assert_cmpuint(i2c_value, ==, 3000 + i);
}
}
/* Test setting some read/write registers */
static void test_rw_regs(void *obj, void *data, QGuestAllocator *alloc)
{
uint16_t i2c_value;
QI2CDevice *i2cdev = (QI2CDevice *)obj;
i2c_set8(i2cdev, PMBUS_PAGE, 11);
i2c_value = i2c_get8(i2cdev, PMBUS_PAGE);
g_assert_cmpuint(i2c_value, ==, 11);
i2c_set8(i2cdev, PMBUS_OPERATION, 1);
i2c_value = i2c_get8(i2cdev, PMBUS_OPERATION);
g_assert_cmpuint(i2c_value, ==, 1);
max34451_i2c_set16(i2cdev, PMBUS_VOUT_MARGIN_HIGH, 5000);
i2c_value = max34451_i2c_get16(i2cdev, PMBUS_VOUT_MARGIN_HIGH);
g_assert_cmpuint(i2c_value, ==, 5000);
max34451_i2c_set16(i2cdev, PMBUS_VOUT_MARGIN_LOW, 4000);
i2c_value = max34451_i2c_get16(i2cdev, PMBUS_VOUT_MARGIN_LOW);
g_assert_cmpuint(i2c_value, ==, 4000);
max34451_i2c_set16(i2cdev, PMBUS_VOUT_OV_FAULT_LIMIT, 5500);
i2c_value = max34451_i2c_get16(i2cdev, PMBUS_VOUT_OV_FAULT_LIMIT);
g_assert_cmpuint(i2c_value, ==, 5500);
max34451_i2c_set16(i2cdev, PMBUS_VOUT_OV_WARN_LIMIT, 5600);
i2c_value = max34451_i2c_get16(i2cdev, PMBUS_VOUT_OV_WARN_LIMIT);
g_assert_cmpuint(i2c_value, ==, 5600);
max34451_i2c_set16(i2cdev, PMBUS_VOUT_UV_FAULT_LIMIT, 5700);
i2c_value = max34451_i2c_get16(i2cdev, PMBUS_VOUT_UV_FAULT_LIMIT);
g_assert_cmpuint(i2c_value, ==, 5700);
max34451_i2c_set16(i2cdev, PMBUS_VOUT_UV_WARN_LIMIT, 5800);
i2c_value = max34451_i2c_get16(i2cdev, PMBUS_VOUT_UV_WARN_LIMIT);
g_assert_cmpuint(i2c_value, ==, 5800);
max34451_i2c_set16(i2cdev, PMBUS_POWER_GOOD_ON, 5900);
i2c_value = max34451_i2c_get16(i2cdev, PMBUS_POWER_GOOD_ON);
g_assert_cmpuint(i2c_value, ==, 5900);
max34451_i2c_set16(i2cdev, PMBUS_POWER_GOOD_OFF, 6100);
i2c_value = max34451_i2c_get16(i2cdev, PMBUS_POWER_GOOD_OFF);
g_assert_cmpuint(i2c_value, ==, 6100);
}
/* Test that Read only registers can't be written */
static void test_ro_regs(void *obj, void *data, QGuestAllocator *alloc)
{
uint16_t i2c_value, i2c_init_value;
QI2CDevice *i2cdev = (QI2CDevice *)obj;
i2c_set8(i2cdev, PMBUS_PAGE, 1); /* move to page 1 */
i2c_init_value = i2c_get8(i2cdev, PMBUS_CAPABILITY);
i2c_set8(i2cdev, PMBUS_CAPABILITY, 0xF9);
i2c_value = i2c_get8(i2cdev, PMBUS_CAPABILITY);
g_assert_cmpuint(i2c_init_value, ==, i2c_value);
i2c_init_value = max34451_i2c_get16(i2cdev, PMBUS_READ_VOUT);
max34451_i2c_set16(i2cdev, PMBUS_READ_VOUT, 0xDEAD);
i2c_value = max34451_i2c_get16(i2cdev, PMBUS_READ_VOUT);
g_assert_cmpuint(i2c_init_value, ==, i2c_value);
g_assert_cmphex(i2c_value, !=, 0xDEAD);
i2c_set8(i2cdev, PMBUS_PAGE, 16); /* move to page 16 */
i2c_init_value = max34451_i2c_get16(i2cdev, PMBUS_READ_TEMPERATURE_1);
max34451_i2c_set16(i2cdev, PMBUS_READ_TEMPERATURE_1, 0xABBA);
i2c_value = max34451_i2c_get16(i2cdev, PMBUS_READ_TEMPERATURE_1);
g_assert_cmpuint(i2c_init_value, ==, i2c_value);
g_assert_cmphex(i2c_value, !=, 0xABBA);
}
/* test over voltage faults */
static void test_ov_faults(void *obj, void *data, QGuestAllocator *alloc)
{
uint16_t i2c_value;
uint8_t i2c_byte;
QI2CDevice *i2cdev = (QI2CDevice *)obj;
char *path;
/* Test ov fault reporting */
for (int i = 0; i < MAX34451_NUM_PWR_DEVICES; i++) {
path = g_strdup_printf("vout[%d]", i);
i2c_set8(i2cdev, PMBUS_PAGE, i);
max34451_i2c_set16(i2cdev, PMBUS_VOUT_OV_FAULT_LIMIT, 5000);
qmp_max34451_set(TEST_ID, path, 5100);
g_free(path);
i2c_value = max34451_i2c_get16(i2cdev, PMBUS_STATUS_WORD);
i2c_byte = i2c_get8(i2cdev, PMBUS_STATUS_VOUT);
g_assert_true((i2c_value & PB_STATUS_VOUT) != 0);
g_assert_true((i2c_byte & PB_STATUS_VOUT_OV_FAULT) != 0);
}
}
/* test over temperature faults */
static void test_ot_faults(void *obj, void *data, QGuestAllocator *alloc)
{
uint16_t i2c_value;
uint8_t i2c_byte;
QI2CDevice *i2cdev = (QI2CDevice *)obj;
char *path;
for (int i = 0; i < MAX34451_NUM_TEMP_DEVICES; i++) {
path = g_strdup_printf("temperature[%d]", i);
i2c_set8(i2cdev, PMBUS_PAGE, i + 16);
max34451_i2c_set16(i2cdev, PMBUS_OT_FAULT_LIMIT, 6000);
qmp_max34451_set(TEST_ID, path, 6100);
g_free(path);
i2c_value = max34451_i2c_get16(i2cdev, PMBUS_STATUS_WORD);
i2c_byte = i2c_get8(i2cdev, PMBUS_STATUS_TEMPERATURE);
g_assert_true((i2c_value & PB_STATUS_TEMPERATURE) != 0);
g_assert_true((i2c_byte & PB_STATUS_OT_FAULT) != 0);
}
}
#define RAND_ON_OFF_CONFIG 0x12
#define RAND_MFR_MODE 0x3456
/* test writes to all pages */
static void test_all_pages(void *obj, void *data, QGuestAllocator *alloc)
{
uint16_t i2c_value;
QI2CDevice *i2cdev = (QI2CDevice *)obj;
i2c_set8(i2cdev, PMBUS_PAGE, PB_ALL_PAGES);
i2c_set8(i2cdev, PMBUS_ON_OFF_CONFIG, RAND_ON_OFF_CONFIG);
max34451_i2c_set16(i2cdev, MAX34451_MFR_MODE, RAND_MFR_MODE);
for (int i = 0; i < MAX34451_NUM_TEMP_DEVICES + MAX34451_NUM_PWR_DEVICES;
i++) {
i2c_value = i2c_get8(i2cdev, PMBUS_ON_OFF_CONFIG);
g_assert_cmphex(i2c_value, ==, RAND_ON_OFF_CONFIG);
i2c_value = max34451_i2c_get16(i2cdev, MAX34451_MFR_MODE);
g_assert_cmphex(i2c_value, ==, RAND_MFR_MODE);
}
}
static void max34451_register_nodes(void)
{
QOSGraphEdgeOptions opts = {
.extra_device_opts = "id=" TEST_ID ",address=0x4e"
};
add_qi2c_address(&opts, &(QI2CAddress) { TEST_ADDR });
qos_node_create_driver("max34451", i2c_device_create);
qos_node_consumes("max34451", "i2c-bus", &opts);
qos_add_test("test_defaults", "max34451", test_defaults, NULL);
qos_add_test("test_temperature", "max34451", test_temperature, NULL);
qos_add_test("test_voltage", "max34451", test_voltage, NULL);
qos_add_test("test_rw_regs", "max34451", test_rw_regs, NULL);
qos_add_test("test_ro_regs", "max34451", test_ro_regs, NULL);
qos_add_test("test_ov_faults", "max34451", test_ov_faults, NULL);
qos_add_test("test_ot_faults", "max34451", test_ot_faults, NULL);
qos_add_test("test_all_pages", "max34451", test_all_pages, NULL);
}
libqos_init(max34451_register_nodes);
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