Simon Glass | d19de0d | 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> |
Simon Glass | d19de0d | 2014-12-10 08:55:50 -0700 | [diff] [blame] | 12 | #include <i2c.h> |
| 13 | #include <asm/test.h> |
| 14 | #include <dm/lists.h> |
| 15 | #include <dm/device-internal.h> |
Simon Glass | d19de0d | 2014-12-10 08:55:50 -0700 | [diff] [blame] | 16 | |
Simon Glass | 182bf92 | 2015-04-20 12:37:15 -0600 | [diff] [blame] | 17 | struct sandbox_i2c_priv { |
| 18 | bool test_mode; |
Simon Glass | d19de0d | 2014-12-10 08:55:50 -0700 | [diff] [blame] | 19 | }; |
| 20 | |
| 21 | static int get_emul(struct udevice *dev, struct udevice **devp, |
| 22 | struct dm_i2c_ops **opsp) |
| 23 | { |
Simon Glass | e6f66ec | 2015-01-25 08:27:13 -0700 | [diff] [blame] | 24 | struct dm_i2c_chip *plat; |
Przemyslaw Marczak | a989ec8 | 2015-05-13 13:38:31 +0200 | [diff] [blame] | 25 | struct udevice *child; |
Simon Glass | d19de0d | 2014-12-10 08:55:50 -0700 | [diff] [blame] | 26 | int ret; |
| 27 | |
| 28 | *devp = NULL; |
| 29 | *opsp = NULL; |
Simon Glass | e6f66ec | 2015-01-25 08:27:13 -0700 | [diff] [blame] | 30 | plat = dev_get_parent_platdata(dev); |
| 31 | if (!plat->emul) { |
Simon Glass | 2e3f1ff | 2016-07-05 17:10:09 -0600 | [diff] [blame] | 32 | ret = dm_scan_fdt_dev(dev); |
Simon Glass | d19de0d | 2014-12-10 08:55:50 -0700 | [diff] [blame] | 33 | if (ret) |
| 34 | return ret; |
| 35 | |
Przemyslaw Marczak | a989ec8 | 2015-05-13 13:38:31 +0200 | [diff] [blame] | 36 | for (device_find_first_child(dev, &child); child; |
| 37 | device_find_next_child(&child)) { |
| 38 | if (device_get_uclass_id(child) != UCLASS_I2C_EMUL) |
| 39 | continue; |
| 40 | |
| 41 | ret = device_probe(child); |
| 42 | if (ret) |
| 43 | return ret; |
| 44 | |
| 45 | break; |
| 46 | } |
| 47 | |
| 48 | if (child) |
| 49 | plat->emul = child; |
| 50 | else |
| 51 | return -ENODEV; |
Simon Glass | d19de0d | 2014-12-10 08:55:50 -0700 | [diff] [blame] | 52 | } |
Simon Glass | e6f66ec | 2015-01-25 08:27:13 -0700 | [diff] [blame] | 53 | *devp = plat->emul; |
| 54 | *opsp = i2c_get_ops(plat->emul); |
Simon Glass | d19de0d | 2014-12-10 08:55:50 -0700 | [diff] [blame] | 55 | |
| 56 | return 0; |
| 57 | } |
| 58 | |
Simon Glass | 182bf92 | 2015-04-20 12:37:15 -0600 | [diff] [blame] | 59 | void sandbox_i2c_set_test_mode(struct udevice *bus, bool test_mode) |
| 60 | { |
| 61 | struct sandbox_i2c_priv *priv = dev_get_priv(bus); |
| 62 | |
| 63 | priv->test_mode = test_mode; |
| 64 | } |
| 65 | |
Simon Glass | d19de0d | 2014-12-10 08:55:50 -0700 | [diff] [blame] | 66 | static int sandbox_i2c_xfer(struct udevice *bus, struct i2c_msg *msg, |
| 67 | int nmsgs) |
| 68 | { |
Simon Glass | e564f05 | 2015-03-05 12:25:20 -0700 | [diff] [blame] | 69 | struct dm_i2c_bus *i2c = dev_get_uclass_priv(bus); |
Simon Glass | 182bf92 | 2015-04-20 12:37:15 -0600 | [diff] [blame] | 70 | struct sandbox_i2c_priv *priv = dev_get_priv(bus); |
Simon Glass | d19de0d | 2014-12-10 08:55:50 -0700 | [diff] [blame] | 71 | struct dm_i2c_ops *ops; |
| 72 | struct udevice *emul, *dev; |
| 73 | bool is_read; |
| 74 | int ret; |
| 75 | |
| 76 | /* Special test code to return success but with no emulation */ |
Simon Glass | 182bf92 | 2015-04-20 12:37:15 -0600 | [diff] [blame] | 77 | if (priv->test_mode && msg->addr == SANDBOX_I2C_TEST_ADDR) |
Simon Glass | d19de0d | 2014-12-10 08:55:50 -0700 | [diff] [blame] | 78 | return 0; |
| 79 | |
Simon Glass | 25ab4b0 | 2015-01-25 08:26:55 -0700 | [diff] [blame] | 80 | ret = i2c_get_chip(bus, msg->addr, 1, &dev); |
Simon Glass | d19de0d | 2014-12-10 08:55:50 -0700 | [diff] [blame] | 81 | if (ret) |
| 82 | return ret; |
| 83 | |
| 84 | ret = get_emul(dev, &emul, &ops); |
| 85 | if (ret) |
| 86 | return ret; |
| 87 | |
Simon Glass | 182bf92 | 2015-04-20 12:37:15 -0600 | [diff] [blame] | 88 | if (priv->test_mode) { |
| 89 | /* |
| 90 | * For testing, don't allow writing above 100KHz for writes and |
| 91 | * 400KHz for reads. |
| 92 | */ |
| 93 | is_read = nmsgs > 1; |
| 94 | if (i2c->speed_hz > (is_read ? 400000 : 100000)) { |
| 95 | debug("%s: Max speed exceeded\n", __func__); |
| 96 | return -EINVAL; |
| 97 | } |
Simon Glass | 1bde67b | 2015-04-20 12:37:13 -0600 | [diff] [blame] | 98 | } |
Simon Glass | 182bf92 | 2015-04-20 12:37:15 -0600 | [diff] [blame] | 99 | |
Simon Glass | d19de0d | 2014-12-10 08:55:50 -0700 | [diff] [blame] | 100 | return ops->xfer(emul, msg, nmsgs); |
| 101 | } |
| 102 | |
| 103 | static const struct dm_i2c_ops sandbox_i2c_ops = { |
| 104 | .xfer = sandbox_i2c_xfer, |
| 105 | }; |
| 106 | |
Simon Glass | d19de0d | 2014-12-10 08:55:50 -0700 | [diff] [blame] | 107 | static const struct udevice_id sandbox_i2c_ids[] = { |
| 108 | { .compatible = "sandbox,i2c" }, |
| 109 | { } |
| 110 | }; |
| 111 | |
| 112 | U_BOOT_DRIVER(i2c_sandbox) = { |
| 113 | .name = "i2c_sandbox", |
| 114 | .id = UCLASS_I2C, |
| 115 | .of_match = sandbox_i2c_ids, |
Simon Glass | d19de0d | 2014-12-10 08:55:50 -0700 | [diff] [blame] | 116 | .ops = &sandbox_i2c_ops, |
Simon Glass | 182bf92 | 2015-04-20 12:37:15 -0600 | [diff] [blame] | 117 | .priv_auto_alloc_size = sizeof(struct sandbox_i2c_priv), |
Simon Glass | d19de0d | 2014-12-10 08:55:50 -0700 | [diff] [blame] | 118 | }; |