Simple testcase for validating proper operation of read and write for all
three BSC controllers.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/481
Signed-off-by: Rayhan Faizel <rayhan.faizel@gmail.com>
---
 tests/qtest/bcm2835-i2c-test.c | 105 +++++++++++++++++++++++++++++++++
 tests/qtest/meson.build        |   2 +-
 2 files changed, 106 insertions(+), 1 deletion(-)
 create mode 100644 tests/qtest/bcm2835-i2c-test.c

diff --git a/tests/qtest/bcm2835-i2c-test.c b/tests/qtest/bcm2835-i2c-test.c
new file mode 100644
index 0000000000..6ec15b8976
--- /dev/null
+++ b/tests/qtest/bcm2835-i2c-test.c
@@ -0,0 +1,105 @@
+/*
+ * QTest testcase for Broadcom Serial Controller (BSC)
+ *
+ * Copyright (c) 2024 Rayhan Faizel <rayhan.faizel@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "qemu/osdep.h"
+#include "libqtest-single.h"
+
+#include "hw/i2c/bcm2835_i2c.h"
+#include "hw/sensor/tmp105_regs.h"
+
+static const uint32_t bsc_base_addrs[] = {
+    0x3f205000,                         /* I2C0 */
+    0x3f804000,                         /* I2C1 */
+    0x3f805000,                         /* I2C2 */
+};
+
+static void bcm2835_i2c_init_transfer(uint32_t base_addr, bool read)
+{
+    /* read flag is bit 0 so we can write it directly */
+    int interrupt = read ? BCM2835_I2C_C_INTR : BCM2835_I2C_C_INTT;
+
+    writel(base_addr + BCM2835_I2C_C,
+           BCM2835_I2C_C_I2CEN | BCM2835_I2C_C_INTD |
+           BCM2835_I2C_C_ST | BCM2835_I2C_C_CLEAR | interrupt | read);
+}
+
+static void test_i2c_read_write(gconstpointer data)
+{
+    uint32_t i2cdata;
+    intptr_t index = (intptr_t) data;
+    uint32_t base_addr = bsc_base_addrs[index];
+
+    /* Write to TMP105 register */
+    writel(base_addr + BCM2835_I2C_A, 0x50);
+    writel(base_addr + BCM2835_I2C_DLEN, 3);
+
+    bcm2835_i2c_init_transfer(base_addr, 0);
+
+    writel(base_addr + BCM2835_I2C_FIFO, TMP105_REG_T_HIGH);
+    writel(base_addr + BCM2835_I2C_FIFO, 0xde);
+    writel(base_addr + BCM2835_I2C_FIFO, 0xad);
+
+
+    /* Read from TMP105 register */
+    writel(base_addr + BCM2835_I2C_A, 0x50);
+    writel(base_addr + BCM2835_I2C_DLEN, 1);
+
+    bcm2835_i2c_init_transfer(base_addr, 0);
+
+    writel(base_addr + BCM2835_I2C_FIFO, TMP105_REG_T_HIGH);
+
+    writel(base_addr + BCM2835_I2C_DLEN, 2);
+    bcm2835_i2c_init_transfer(base_addr, 1);
+
+    i2cdata = readl(base_addr + BCM2835_I2C_FIFO);
+    g_assert_cmpint(i2cdata, ==, 0xde);
+
+    i2cdata = readl(base_addr + BCM2835_I2C_FIFO);
+    g_assert_cmpint(i2cdata, ==, 0xad);
+}
+
+int main(int argc, char **argv)
+{
+    int ret;
+    int i;
+
+    g_test_init(&argc, &argv, NULL);
+
+    for (i = 0; i < 3; i++) {
+        g_autofree char *test_name =
+        g_strdup_printf("/bcm2835/bcm2835-i2c%d/read_write", i);
+        qtest_add_data_func(test_name, (void *)(intptr_t) i,
+                            test_i2c_read_write);
+    }
+
+    /* Run I2C tests with TMP105 slaves on all three buses */
+    qtest_start("-M raspi3b "
+                "-device tmp105,address=0x50,bus=i2c-bus.0 "
+                "-device tmp105,address=0x50,bus=i2c-bus.1 "
+                "-device tmp105,address=0x50,bus=i2c-bus.2");
+    ret = g_test_run();
+    qtest_end();
+
+    return ret;
+}
diff --git a/tests/qtest/meson.build b/tests/qtest/meson.build
index 39557d5ecb..8fe303160e 100644
--- a/tests/qtest/meson.build
+++ b/tests/qtest/meson.build
@@ -228,7 +228,7 @@ qtests_aarch64 = \
     ['tpm-tis-device-test', 'tpm-tis-device-swtpm-test'] : []) +                                         \
   (config_all_devices.has_key('CONFIG_XLNX_ZYNQMP_ARM') ? ['xlnx-can-test', 'fuzz-xlnx-dp-test'] : []) + \
   (config_all_devices.has_key('CONFIG_XLNX_VERSAL') ? ['xlnx-canfd-test', 'xlnx-versal-trng-test'] : []) + \
-  (config_all_devices.has_key('CONFIG_RASPI') ? ['bcm2835-dma-test'] : []) +  \
+  (config_all_devices.has_key('CONFIG_RASPI') ? ['bcm2835-dma-test', 'bcm2835-i2c-test'] : []) +  \
   (config_all_accel.has_key('CONFIG_TCG') and                                            \
    config_all_devices.has_key('CONFIG_TPM_TIS_I2C') ? ['tpm-tis-i2c-test'] : []) + \
   (config_all_devices.has_key('CONFIG_NPCM7XX') ? qtests_npcm7xx : []) + \
-- 
2.34.1