/*
 * Copyright (c) 2014 Google, Inc
 *
 * SPDX-License-Identifier:     GPL-2.0+
 */

#include <common.h>
#include <dm.h>
#include <dm/device-internal.h>
#include <dm/test.h>
#include <dm/uclass-internal.h>
#include <dm/util.h>
#include <test/ut.h>

DECLARE_GLOBAL_DATA_PTR;

struct dm_test_parent_platdata {
        int count;
        int bind_flag;
        int uclass_bind_flag;
};

enum {
        FLAG_CHILD_PROBED       = 10,
        FLAG_CHILD_REMOVED      = -7,
};

static struct dm_test_state *test_state;

static int testbus_drv_probe(struct udevice *dev)
{
        return dm_scan_fdt_dev(dev);
}

static int testbus_child_post_bind(struct udevice *dev)
{
        struct dm_test_parent_platdata *plat;

        plat = dev_get_parent_platdata(dev);
        plat->bind_flag = 1;
        plat->uclass_bind_flag = 2;

        return 0;
}

static int testbus_child_pre_probe(struct udevice *dev)
{
        struct dm_test_parent_data *parent_data = dev_get_parent_priv(dev);

        parent_data->flag += FLAG_CHILD_PROBED;

        return 0;
}

static int testbus_child_pre_probe_uclass(struct udevice *dev)
{
        struct dm_test_priv *priv = dev_get_priv(dev);

        priv->uclass_flag++;

        return 0;
}

static int testbus_child_post_remove(struct udevice *dev)
{
        struct dm_test_parent_data *parent_data = dev_get_parent_priv(dev);
        struct dm_test_state *dms = test_state;

        parent_data->flag += FLAG_CHILD_REMOVED;
        if (dms)
                dms->removed = dev;

        return 0;
}

static const struct udevice_id testbus_ids[] = {
        {
                .compatible = "denx,u-boot-test-bus",
                .data = DM_TEST_TYPE_FIRST },
        { }
};

U_BOOT_DRIVER(testbus_drv) = {
        .name   = "testbus_drv",
        .of_match       = testbus_ids,
        .id     = UCLASS_TEST_BUS,
        .probe  = testbus_drv_probe,
        .child_post_bind = testbus_child_post_bind,
        .priv_auto_alloc_size = sizeof(struct dm_test_priv),
        .platdata_auto_alloc_size = sizeof(struct dm_test_pdata),
        .per_child_auto_alloc_size = sizeof(struct dm_test_parent_data),
        .per_child_platdata_auto_alloc_size =
                        sizeof(struct dm_test_parent_platdata),
        .child_pre_probe = testbus_child_pre_probe,
        .child_post_remove = testbus_child_post_remove,
};

UCLASS_DRIVER(testbus) = {
        .name           = "testbus",
        .id             = UCLASS_TEST_BUS,
        .flags          = DM_UC_FLAG_SEQ_ALIAS,
        .child_pre_probe = testbus_child_pre_probe_uclass,
};

/* Test that we can probe for children */
static int dm_test_bus_children(struct unit_test_state *uts)
{
        int num_devices = 6;
        struct udevice *bus;
        struct uclass *uc;

        ut_assertok(uclass_get(UCLASS_TEST_FDT, &uc));
        ut_asserteq(num_devices, list_count_items(&uc->dev_head));

        /* Probe the bus, which should yield 3 more devices */
        ut_assertok(uclass_get_device(UCLASS_TEST_BUS, 0, &bus));
        num_devices += 3;

        ut_assertok(uclass_get(UCLASS_TEST_FDT, &uc));
        ut_asserteq(num_devices, list_count_items(&uc->dev_head));

        ut_assert(!dm_check_devices(uts, num_devices));

        return 0;
}
DM_TEST(dm_test_bus_children, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);

/* Test our functions for accessing children */
static int dm_test_bus_children_funcs(struct unit_test_state *uts)
{
        const void *blob = gd->fdt_blob;
        struct udevice *bus, *dev;
        int node;

        ut_assertok(uclass_get_device(UCLASS_TEST_BUS, 0, &bus));

        /* device_get_child() */
        ut_assertok(device_get_child(bus, 0, &dev));
        ut_asserteq(-ENODEV, device_get_child(bus, 4, &dev));
        ut_assertok(device_get_child_by_seq(bus, 5, &dev));
        ut_assert(dev->flags & DM_FLAG_ACTIVATED);
        ut_asserteq_str("c-test@5", dev->name);

        /* Device with sequence number 0 should be accessible */
        ut_asserteq(-ENODEV, device_find_child_by_seq(bus, -1, true, &dev));
        ut_assertok(device_find_child_by_seq(bus, 0, true, &dev));
        ut_assert(!(dev->flags & DM_FLAG_ACTIVATED));
        ut_asserteq(-ENODEV, device_find_child_by_seq(bus, 0, false, &dev));
        ut_assertok(device_get_child_by_seq(bus, 0, &dev));
        ut_assert(dev->flags & DM_FLAG_ACTIVATED);

        /* There is no device with sequence number 2 */
        ut_asserteq(-ENODEV, device_find_child_by_seq(bus, 2, false, &dev));
        ut_asserteq(-ENODEV, device_find_child_by_seq(bus, 2, true, &dev));
        ut_asserteq(-ENODEV, device_get_child_by_seq(bus, 2, &dev));

        /* Looking for something that is not a child */
        node = fdt_path_offset(blob, "/junk");
        ut_asserteq(-ENODEV, device_find_child_by_of_offset(bus, node, &dev));
        node = fdt_path_offset(blob, "/d-test");
        ut_asserteq(-ENODEV, device_find_child_by_of_offset(bus, node, &dev));

        /* Find a valid child */
        node = fdt_path_offset(blob, "/some-bus/c-test@1");
        ut_assertok(device_find_child_by_of_offset(bus, node, &dev));
        ut_assert(!(dev->flags & DM_FLAG_ACTIVATED));
        ut_assertok(device_get_child_by_of_offset(bus, node, &dev));
        ut_assert(dev->flags & DM_FLAG_ACTIVATED);

        return 0;
}
DM_TEST(dm_test_bus_children_funcs, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);

/* Test that we can iterate through children */
static int dm_test_bus_children_iterators(struct unit_test_state *uts)
{
        struct udevice *bus, *dev, *child;

        /* Walk through the children one by one */
        ut_assertok(uclass_get_device(UCLASS_TEST_BUS, 0, &bus));
        ut_assertok(device_find_first_child(bus, &dev));
        ut_asserteq_str("c-test@5", dev->name);
        ut_assertok(device_find_next_child(&dev));
        ut_asserteq_str("c-test@0", dev->name);
        ut_assertok(device_find_next_child(&dev));
        ut_asserteq_str("c-test@1", dev->name);
        ut_assertok(device_find_next_child(&dev));
        ut_asserteq_ptr(dev, NULL);

        /* Move to the next child without using device_find_first_child() */
        ut_assertok(device_find_child_by_seq(bus, 5, true, &dev));
        ut_asserteq_str("c-test@5", dev->name);
        ut_assertok(device_find_next_child(&dev));
        ut_asserteq_str("c-test@0", dev->name);

        /* Try a device with no children */
        ut_assertok(device_find_first_child(dev, &child));
        ut_asserteq_ptr(child, NULL);

        return 0;
}
DM_TEST(dm_test_bus_children_iterators,
        DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);

/* Test that the bus can store data about each child */
static int test_bus_parent_data(struct unit_test_state *uts)
{
        struct dm_test_parent_data *parent_data;
        struct udevice *bus, *dev;
        struct uclass *uc;
        int value;

        ut_assertok(uclass_get_device(UCLASS_TEST_BUS, 0, &bus));

        /* Check that parent data is allocated */
        ut_assertok(device_find_child_by_seq(bus, 0, true, &dev));
        ut_asserteq_ptr(NULL, dev_get_parent_priv(dev));
        ut_assertok(device_get_child_by_seq(bus, 0, &dev));
        parent_data = dev_get_parent_priv(dev);
        ut_assert(NULL != parent_data);

        /* Check that it starts at 0 and goes away when device is removed */
        parent_data->sum += 5;
        ut_asserteq(5, parent_data->sum);
        device_remove(dev);
        ut_asserteq_ptr(NULL, dev_get_parent_priv(dev));

        /* Check that we can do this twice */
        ut_assertok(device_get_child_by_seq(bus, 0, &dev));
        parent_data = dev_get_parent_priv(dev);
        ut_assert(NULL != parent_data);
        parent_data->sum += 5;
        ut_asserteq(5, parent_data->sum);

        /* Add parent data to all children */
        ut_assertok(uclass_get(UCLASS_TEST_FDT, &uc));
        value = 5;
        uclass_foreach_dev(dev, uc) {
                /* Ignore these if they are not on this bus */
                if (dev->parent != bus) {
                        ut_asserteq_ptr(NULL, dev_get_parent_priv(dev));
                        continue;
                }
                ut_assertok(device_probe(dev));
                parent_data = dev_get_parent_priv(dev);

                parent_data->sum = value;
                value += 5;
        }

        /* Check it is still there */
        value = 5;
        uclass_foreach_dev(dev, uc) {
                /* Ignore these if they are not on this bus */
                if (dev->parent != bus)
                        continue;
                parent_data = dev_get_parent_priv(dev);

                ut_asserteq(value, parent_data->sum);
                value += 5;
        }

        return 0;
}
/* Test that the bus can store data about each child */
static int dm_test_bus_parent_data(struct unit_test_state *uts)
{
        return test_bus_parent_data(uts);
}
DM_TEST(dm_test_bus_parent_data, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);

/* As above but the size is controlled by the uclass */
static int dm_test_bus_parent_data_uclass(struct unit_test_state *uts)
{
        struct driver *drv;
        struct udevice *bus;
        int size;
        int ret;

        /* Set the driver size to 0 so that the uclass size is used */
        ut_assertok(uclass_find_device(UCLASS_TEST_BUS, 0, &bus));
        drv = (struct driver *)bus->driver;
        size = drv->per_child_auto_alloc_size;
        bus->uclass->uc_drv->per_child_auto_alloc_size = size;
        drv->per_child_auto_alloc_size = 0;
        ret = test_bus_parent_data(uts);
        if (ret)
                return ret;
        bus->uclass->uc_drv->per_child_auto_alloc_size = 0;
        drv->per_child_auto_alloc_size = size;

        return 0;
}
DM_TEST(dm_test_bus_parent_data_uclass,
        DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);

/* Test that the bus ops are called when a child is probed/removed */
static int dm_test_bus_parent_ops(struct unit_test_state *uts)
{
        struct dm_test_parent_data *parent_data;
        struct dm_test_state *dms = uts->priv;
        struct udevice *bus, *dev;
        struct uclass *uc;

        test_state = dms;
        ut_assertok(uclass_get_device(UCLASS_TEST_BUS, 0, &bus));
        ut_assertok(uclass_get(UCLASS_TEST_FDT, &uc));

        uclass_foreach_dev(dev, uc) {
                /* Ignore these if they are not on this bus */
                if (dev->parent != bus)
                        continue;
                ut_asserteq_ptr(NULL, dev_get_parent_priv(dev));

                ut_assertok(device_probe(dev));
                parent_data = dev_get_parent_priv(dev);
                ut_asserteq(FLAG_CHILD_PROBED, parent_data->flag);
        }

        uclass_foreach_dev(dev, uc) {
                /* Ignore these if they are not on this bus */
                if (dev->parent != bus)
                        continue;
                parent_data = dev_get_parent_priv(dev);
                ut_asserteq(FLAG_CHILD_PROBED, parent_data->flag);
                ut_assertok(device_remove(dev));
                ut_asserteq_ptr(NULL, dev_get_parent_priv(dev));
                ut_asserteq_ptr(dms->removed, dev);
        }
        test_state = NULL;

        return 0;
}
DM_TEST(dm_test_bus_parent_ops, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);

static int test_bus_parent_platdata(struct unit_test_state *uts)
{
        struct dm_test_parent_platdata *plat;
        struct udevice *bus, *dev;
        int child_count;

        /* Check that the bus has no children */
        ut_assertok(uclass_find_device(UCLASS_TEST_BUS, 0, &bus));
        device_find_first_child(bus, &dev);
        ut_asserteq_ptr(NULL, dev);

        ut_assertok(uclass_get_device(UCLASS_TEST_BUS, 0, &bus));

        for (device_find_first_child(bus, &dev), child_count = 0;
             dev;
             device_find_next_child(&dev)) {
                /* Check that platform data is allocated */
                plat = dev_get_parent_platdata(dev);
                ut_assert(plat != NULL);

                /*
                 * Check that it is not affected by the device being
                 * probed/removed
                 */
                plat->count++;
                ut_asserteq(1, plat->count);
                device_probe(dev);
                device_remove(dev);

                ut_asserteq_ptr(plat, dev_get_parent_platdata(dev));
                ut_asserteq(1, plat->count);
                ut_assertok(device_probe(dev));
                child_count++;
        }
        ut_asserteq(3, child_count);

        /* Removing the bus should also have no effect (it is still bound) */
        device_remove(bus);
        for (device_find_first_child(bus, &dev), child_count = 0;
             dev;
             device_find_next_child(&dev)) {
                /* Check that platform data is allocated */
                plat = dev_get_parent_platdata(dev);
                ut_assert(plat != NULL);
                ut_asserteq(1, plat->count);
                child_count++;
        }
        ut_asserteq(3, child_count);

        /* Unbind all the children */
        do {
                device_find_first_child(bus, &dev);
                if (dev)
                        device_unbind(dev);
        } while (dev);

        /* Now the child platdata should be removed and re-added */
        device_probe(bus);
        for (device_find_first_child(bus, &dev), child_count = 0;
             dev;
             device_find_next_child(&dev)) {
                /* Check that platform data is allocated */
                plat = dev_get_parent_platdata(dev);
                ut_assert(plat != NULL);
                ut_asserteq(0, plat->count);
                child_count++;
        }
        ut_asserteq(3, child_count);

        return 0;
}

/* Test that the bus can store platform data about each child */
static int dm_test_bus_parent_platdata(struct unit_test_state *uts)
{
        return test_bus_parent_platdata(uts);
}
DM_TEST(dm_test_bus_parent_platdata, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);

/* As above but the size is controlled by the uclass */
static int dm_test_bus_parent_platdata_uclass(struct unit_test_state *uts)
{
        struct udevice *bus;
        struct driver *drv;
        int size;
        int ret;

        /* Set the driver size to 0 so that the uclass size is used */
        ut_assertok(uclass_find_device(UCLASS_TEST_BUS, 0, &bus));
        drv = (struct driver *)bus->driver;
        size = drv->per_child_platdata_auto_alloc_size;
        bus->uclass->uc_drv->per_child_platdata_auto_alloc_size = size;
        drv->per_child_platdata_auto_alloc_size = 0;
        ret = test_bus_parent_platdata(uts);
        if (ret)
                return ret;
        bus->uclass->uc_drv->per_child_platdata_auto_alloc_size = 0;
        drv->per_child_platdata_auto_alloc_size = size;

        return 0;
}
DM_TEST(dm_test_bus_parent_platdata_uclass,
        DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);

/* Test that the child post_bind method is called */
static int dm_test_bus_child_post_bind(struct unit_test_state *uts)
{
        struct dm_test_parent_platdata *plat;
        struct udevice *bus, *dev;
        int child_count;

        ut_assertok(uclass_get_device(UCLASS_TEST_BUS, 0, &bus));
        for (device_find_first_child(bus, &dev), child_count = 0;
             dev;
             device_find_next_child(&dev)) {
                /* Check that platform data is allocated */
                plat = dev_get_parent_platdata(dev);
                ut_assert(plat != NULL);
                ut_asserteq(1, plat->bind_flag);
                child_count++;
        }
        ut_asserteq(3, child_count);

        return 0;
}
DM_TEST(dm_test_bus_child_post_bind, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);

/* Test that the child post_bind method is called */
static int dm_test_bus_child_post_bind_uclass(struct unit_test_state *uts)
{
        struct dm_test_parent_platdata *plat;
        struct udevice *bus, *dev;
        int child_count;

        ut_assertok(uclass_get_device(UCLASS_TEST_BUS, 0, &bus));
        for (device_find_first_child(bus, &dev), child_count = 0;
             dev;
             device_find_next_child(&dev)) {
                /* Check that platform data is allocated */
                plat = dev_get_parent_platdata(dev);
                ut_assert(plat != NULL);
                ut_asserteq(2, plat->uclass_bind_flag);
                child_count++;
        }
        ut_asserteq(3, child_count);

        return 0;
}
DM_TEST(dm_test_bus_child_post_bind_uclass,
        DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);

/*
 * Test that the bus' uclass' child_pre_probe() is called before the
 * device's probe() method
 */
static int dm_test_bus_child_pre_probe_uclass(struct unit_test_state *uts)
{
        struct udevice *bus, *dev;
        int child_count;

        /*
         * See testfdt_drv_probe() which effectively checks that the uclass
         * flag is set before that method is called
         */
        ut_assertok(uclass_get_device(UCLASS_TEST_BUS, 0, &bus));
        for (device_find_first_child(bus, &dev), child_count = 0;
             dev;
             device_find_next_child(&dev)) {
                struct dm_test_priv *priv = dev_get_priv(dev);

                /* Check that things happened in the right order */
                ut_asserteq_ptr(NULL, priv);
                ut_assertok(device_probe(dev));

                priv = dev_get_priv(dev);
                ut_assert(priv != NULL);
                ut_asserteq(1, priv->uclass_flag);
                ut_asserteq(1, priv->uclass_total);
                child_count++;
        }
        ut_asserteq(3, child_count);

        return 0;
}
DM_TEST(dm_test_bus_child_pre_probe_uclass,
        DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);