| Simon Glass | 3834c84 | 2014-12-10 08:55:50 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Simulate an I2C port |
| 3 | * |
| 4 | * Copyright (c) 2014 Google, Inc |
| 5 | * |
| 6 | * SPDX-License-Identifier: GPL-2.0+ |
| 7 | */ |
| 8 | |
| 9 | #include <common.h> |
| 10 | #include <dm.h> |
| 11 | #include <errno.h> |
| 12 | #include <fdtdec.h> |
| 13 | #include <i2c.h> |
| 14 | #include <asm/test.h> |
| 15 | #include <dm/lists.h> |
| 16 | #include <dm/device-internal.h> |
| 17 | #include <dm/root.h> |
| 18 | |
| 19 | DECLARE_GLOBAL_DATA_PTR; |
| 20 | |
| 21 | struct dm_sandbox_i2c_emul_priv { |
| 22 | struct udevice *emul; |
| 23 | }; |
| 24 | |
| 25 | static int get_emul(struct udevice *dev, struct udevice **devp, |
| 26 | struct dm_i2c_ops **opsp) |
| 27 | { |
| 28 | struct dm_i2c_chip *priv; |
| 29 | int ret; |
| 30 | |
| 31 | *devp = NULL; |
| 32 | *opsp = NULL; |
| 33 | priv = dev_get_parentdata(dev); |
| 34 | if (!priv->emul) { |
| 35 | ret = dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, |
| 36 | false); |
| 37 | if (ret) |
| 38 | return ret; |
| 39 | |
| 40 | ret = device_get_child(dev, 0, &priv->emul); |
| 41 | if (ret) |
| 42 | return ret; |
| 43 | } |
| 44 | *devp = priv->emul; |
| 45 | *opsp = i2c_get_ops(priv->emul); |
| 46 | |
| 47 | return 0; |
| 48 | } |
| 49 | |
| 50 | static int sandbox_i2c_xfer(struct udevice *bus, struct i2c_msg *msg, |
| 51 | int nmsgs) |
| 52 | { |
| 53 | struct dm_i2c_bus *i2c = bus->uclass_priv; |
| 54 | struct dm_i2c_ops *ops; |
| 55 | struct udevice *emul, *dev; |
| 56 | bool is_read; |
| 57 | int ret; |
| 58 | |
| 59 | /* Special test code to return success but with no emulation */ |
| 60 | if (msg->addr == SANDBOX_I2C_TEST_ADDR) |
| 61 | return 0; |
| 62 | |
| 63 | ret = i2c_get_chip(bus, msg->addr, &dev); |
| 64 | if (ret) |
| 65 | return ret; |
| 66 | |
| 67 | ret = get_emul(dev, &emul, &ops); |
| 68 | if (ret) |
| 69 | return ret; |
| 70 | |
| 71 | /* |
| 72 | * For testing, don't allow writing above 100KHz for writes and |
| 73 | * 400KHz for reads |
| 74 | */ |
| 75 | is_read = nmsgs > 1; |
| 76 | if (i2c->speed_hz > (is_read ? 400000 : 100000)) |
| 77 | return -EINVAL; |
| 78 | return ops->xfer(emul, msg, nmsgs); |
| 79 | } |
| 80 | |
| 81 | static const struct dm_i2c_ops sandbox_i2c_ops = { |
| 82 | .xfer = sandbox_i2c_xfer, |
| 83 | }; |
| 84 | |
| 85 | static int sandbox_i2c_child_pre_probe(struct udevice *dev) |
| 86 | { |
| 87 | struct dm_i2c_chip *i2c_chip = dev_get_parentdata(dev); |
| 88 | |
| 89 | /* Ignore our test address */ |
| 90 | if (i2c_chip->chip_addr == SANDBOX_I2C_TEST_ADDR) |
| 91 | return 0; |
| 92 | if (dev->of_offset == -1) |
| 93 | return 0; |
| 94 | |
| 95 | return i2c_chip_ofdata_to_platdata(gd->fdt_blob, dev->of_offset, |
| 96 | i2c_chip); |
| 97 | } |
| 98 | |
| 99 | static const struct udevice_id sandbox_i2c_ids[] = { |
| 100 | { .compatible = "sandbox,i2c" }, |
| 101 | { } |
| 102 | }; |
| 103 | |
| 104 | U_BOOT_DRIVER(i2c_sandbox) = { |
| 105 | .name = "i2c_sandbox", |
| 106 | .id = UCLASS_I2C, |
| 107 | .of_match = sandbox_i2c_ids, |
| 108 | .per_child_auto_alloc_size = sizeof(struct dm_i2c_chip), |
| 109 | .child_pre_probe = sandbox_i2c_child_pre_probe, |
| 110 | .ops = &sandbox_i2c_ops, |
| 111 | }; |