tests/qtest/bcm2835-i2c-test.c

   1 /*
   2  * QTest testcase for Broadcom Serial Controller (BSC)
   3  *
   4  * Copyright (c) 2024 Rayhan Faizel <rayhan.faizel@gmail.com>
   5  *
   6  * SPDX-License-Identifier: MIT
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  24  * THE SOFTWARE.
  25  */
  26
  27 #include "qemu/osdep.h"
  28 #include "libqtest-single.h"
  29
  30 #include "hw/i2c/bcm2835_i2c.h"
  31 #include "hw/sensor/tmp105_regs.h"
  32
  33 static const uint32_t bsc_base_addrs[] = {
  34     0x3f205000,                         /* I2C0 */
  35     0x3f804000,                         /* I2C1 */
  36     0x3f805000,                         /* I2C2 */
  37 };
  38
  39 static void bcm2835_i2c_init_transfer(uint32_t base_addr, bool read)
  40 {
  41     /* read flag is bit 0 so we can write it directly */
  42     int interrupt = read ? BCM2835_I2C_C_INTR : BCM2835_I2C_C_INTT;
  43
  44     writel(base_addr + BCM2835_I2C_C,
  45            BCM2835_I2C_C_I2CEN | BCM2835_I2C_C_INTD |
  46            BCM2835_I2C_C_ST | BCM2835_I2C_C_CLEAR | interrupt | read);
  47 }
  48
  49 static void test_i2c_read_write(gconstpointer data)
  50 {
  51     uint32_t i2cdata;
  52     intptr_t index = (intptr_t) data;
  53     uint32_t base_addr = bsc_base_addrs[index];
  54
  55     /* Write to TMP105 register */
  56     writel(base_addr + BCM2835_I2C_A, 0x50);
  57     writel(base_addr + BCM2835_I2C_DLEN, 3);
  58
  59     bcm2835_i2c_init_transfer(base_addr, 0);
  60
  61     writel(base_addr + BCM2835_I2C_FIFO, TMP105_REG_T_HIGH);
  62     writel(base_addr + BCM2835_I2C_FIFO, 0xde);
  63     writel(base_addr + BCM2835_I2C_FIFO, 0xad);
  64
  65     /* Clear flags */
  66     writel(base_addr + BCM2835_I2C_S, BCM2835_I2C_S_DONE | BCM2835_I2C_S_ERR |
  67                                       BCM2835_I2C_S_CLKT);
  68
  69     /* Read from TMP105 register */
  70     writel(base_addr + BCM2835_I2C_A, 0x50);
  71     writel(base_addr + BCM2835_I2C_DLEN, 1);
  72
  73     bcm2835_i2c_init_transfer(base_addr, 0);
  74
  75     writel(base_addr + BCM2835_I2C_FIFO, TMP105_REG_T_HIGH);
  76
  77     writel(base_addr + BCM2835_I2C_DLEN, 2);
  78     bcm2835_i2c_init_transfer(base_addr, 1);
  79
  80     i2cdata = readl(base_addr + BCM2835_I2C_FIFO);
  81     g_assert_cmpint(i2cdata, ==, 0xde);
  82
  83     i2cdata = readl(base_addr + BCM2835_I2C_FIFO);
  84     g_assert_cmpint(i2cdata, ==, 0xad);
  85
  86     /* Clear flags */
  87     writel(base_addr + BCM2835_I2C_S, BCM2835_I2C_S_DONE | BCM2835_I2C_S_ERR |
  88                                       BCM2835_I2C_S_CLKT);
  89
  90 }
  91
  92 int main(int argc, char **argv)
  93 {
  94     int ret;
  95     int i;
  96
  97     g_test_init(&argc, &argv, NULL);
  98
  99     for (i = 0; i < 3; i++) {
 100         g_autofree char *test_name =
 101         g_strdup_printf("/bcm2835/bcm2835-i2c%d/read_write", i);
 102         qtest_add_data_func(test_name, (void *)(intptr_t) i,
 103                             test_i2c_read_write);
 104     }
 105
 106     /* Run I2C tests with TMP105 slaves on all three buses */
 107     qtest_start("-M raspi3b "
 108                 "-device tmp105,address=0x50,bus=i2c-bus.0 "
 109                 "-device tmp105,address=0x50,bus=i2c-bus.1 "
 110                 "-device tmp105,address=0x50,bus=i2c-bus.2");
 111     ret = g_test_run();
 112     qtest_end();
 113
 114     return ret;
 115 }