tests: Add device/i2c-test test case
Add unit test for src/device/i2c.c module. This patch is also used as an example for incorporating Cmocka mocking feature (-wrap linker flag). Signed-off-by: Jan Dabros <jsd@semihalf.com> Change-Id: I2eeb565aacc724ae3b9f5c76ef4b98ef695416d6 Reviewed-on: https://review.coreboot.org/c/coreboot/+/40539 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Julius Werner <jwerner@chromium.org> Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
This commit is contained in:
Jan Dabros
Patrick Georgi
parent
2d0ee36913
commit
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##
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## This file is part of the coreboot project.
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##
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## This program is free software; you can redistribute it and/or modify
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## it under the terms of the GNU General Public License as published by
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## the Free Software Foundation; version 2 of the License.
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##
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## This program is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU General Public License for more details.
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##
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tests-y += i2c-test
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i2c-test-srcs += tests/device/i2c-test.c
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i2c-test-srcs += src/device/i2c.c
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i2c-test-mocks += platform_i2c_transfer
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/*
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* This file is part of the coreboot project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <stdarg.h>
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#include <stddef.h>
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#include <setjmp.h>
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#include <limits.h>
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#include <cmocka.h>
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#include <device/i2c_simple.h>
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/* Simulate two i2c devices, both on bus 0, each with three uint8_t regs
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implemented. */
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typedef struct {
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uint8_t reg;
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uint8_t data;
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} i2c_ex_regs_t;
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typedef struct {
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unsigned int bus;
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uint8_t slave;
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i2c_ex_regs_t regs[3];
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} i2c_ex_devs_t;
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i2c_ex_devs_t i2c_ex_devs[] = {
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{.bus = 0, .slave = 0xA, .regs = {
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{.reg = 0x0, .data = 0xB},
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{.reg = 0x1, .data = 0x6},
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{.reg = 0x2, .data = 0xF},
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} },
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{.bus = 0, .slave = 0x3, .regs = {
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{.reg = 0x0, .data = 0xDE},
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{.reg = 0x1, .data = 0xAD},
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{.reg = 0x2, .data = 0xBE},
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} },
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};
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int __wrap_platform_i2c_transfer(unsigned int bus, struct i2c_msg *segments,
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int count)
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{
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int i;
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int reg;
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struct i2c_msg *tmp = segments;
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i2c_ex_devs_t *i2c_dev = NULL;
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check_expected(count);
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for (i = 0; i < count; i++, segments++) {
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check_expected_ptr(segments->buf);
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check_expected(segments->flags);
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}
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reg = tmp->buf[0];
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/* Find object for requested device */
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for (i = 0; i < ARRAY_SIZE(i2c_ex_devs); i++, i2c_dev++)
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if (i2c_ex_devs[i].slave == tmp->slave) {
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i2c_dev = &i2c_ex_devs[i];
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break;
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}
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if (i2c_dev == NULL)
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return -1;
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/* Write commands */
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if (tmp->len > 1) {
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i2c_dev->regs[reg].data = tmp->buf[1];
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};
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/* Read commands */
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for (i = 0; i < count; i++, tmp++)
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if (tmp->flags & I2C_M_RD) {
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*(tmp->buf) = i2c_dev->regs[reg].data;
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};
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}
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static void mock_expect_params_platform_i2c_transfer(void)
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{
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unsigned long int expected_flags[] = {0, I2C_M_RD, I2C_M_TEN,
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I2C_M_RECV_LEN, I2C_M_NOSTART};
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/* Flags should always be only within supported range */
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expect_in_set_count(__wrap_platform_i2c_transfer, segments->flags,
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expected_flags, -1);
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expect_not_value_count(__wrap_platform_i2c_transfer, segments->buf,
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NULL, -1);
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expect_in_range_count(__wrap_platform_i2c_transfer, count, 1, INT_MAX,
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-1);
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}
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#define MASK 0x3
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#define SHIFT 0x1
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static void i2c_read_field_test(void **state)
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{
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int bus, slave, reg;
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int i, j;
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uint8_t buf;
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mock_expect_params_platform_i2c_transfer();
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/* Read particular bits in all registers in all devices, then compare
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with expected value. */
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for (i = 0; i < ARRAY_SIZE(i2c_ex_devs); i++)
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for (j = 0; j < ARRAY_SIZE(i2c_ex_devs[0].regs); j++) {
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i2c_read_field(i2c_ex_devs[i].bus,
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i2c_ex_devs[i].slave,
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i2c_ex_devs[i].regs[j].reg,
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&buf, MASK, SHIFT);
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assert_int_equal((i2c_ex_devs[i].regs[j].data &
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(MASK << SHIFT)) >> SHIFT, buf);
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};
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/* Read whole registers */
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for (i = 0; i < ARRAY_SIZE(i2c_ex_devs); i++)
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for (j = 0; j < ARRAY_SIZE(i2c_ex_devs[0].regs); j++) {
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i2c_read_field(i2c_ex_devs[i].bus,
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i2c_ex_devs[i].slave,
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i2c_ex_devs[i].regs[j].reg,
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&buf, 0xFF, 0);
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assert_int_equal(i2c_ex_devs[i].regs[j].data, buf);
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};
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}
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static void i2c_write_field_test(void **state)
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{
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int bus, slave, reg;
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int i, j;
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uint8_t buf, tmp;
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mock_expect_params_platform_i2c_transfer();
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/* Clear particular bits in all registers in all devices, then compare
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with expected value. */
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for (i = 0; i < ARRAY_SIZE(i2c_ex_devs); i++)
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for (j = 0; j < ARRAY_SIZE(i2c_ex_devs[0].regs); j++) {
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buf = 0x0;
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tmp = i2c_ex_devs[i].regs[j].data;
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i2c_write_field(i2c_ex_devs[i].bus,
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i2c_ex_devs[i].slave,
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i2c_ex_devs[i].regs[j].reg,
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buf, MASK, SHIFT);
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assert_int_equal(i2c_ex_devs[i].regs[j].data,
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(tmp & ~(MASK << SHIFT)) | (buf << SHIFT));
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};
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/* Set all bits in all registers, this time verify using
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i2c_read_field() accessor. */
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for (i = 0; i < ARRAY_SIZE(i2c_ex_devs); i++)
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for (j = 0; j < ARRAY_SIZE(i2c_ex_devs[0].regs); j++) {
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i2c_write_field(i2c_ex_devs[i].bus,
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i2c_ex_devs[i].slave,
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i2c_ex_devs[i].regs[j].reg,
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0xFF, 0xFF, 0);
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i2c_read_field(i2c_ex_devs[i].bus,
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i2c_ex_devs[i].slave,
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i2c_ex_devs[i].regs[j].reg,
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&buf, 0xFF, 0);
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assert_int_equal(buf, 0xFF);
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};
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}
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int main(void)
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{
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const struct CMUnitTest tests[] = {
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cmocka_unit_test(i2c_read_field_test),
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cmocka_unit_test(i2c_write_field_test)
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};
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return cmocka_run_group_tests(tests, NULL, NULL);
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}
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