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git01.mediatek.com / filogic / uboot / 9ad0417060dadea4f3b08405222fa03f5f1d0a09 / . / drivers / i2c / sandbox_i2c.c
blob: 57b1c60fde6da10352fbe442cbd6e5feccb03ab8 [file] [log] [blame]
Tom Rini10e47792018-05-06 17:58:06 -0400[diff] [blame]1// SPDX-License-Identifier: GPL-2.0+
Simon Glass3834c842014-12-10 08:55:50 -0700[diff] [blame]2/*
3 * Simulate an I2C port
4 *
5 * Copyright (c) 2014 Google, Inc
Simon Glass3834c842014-12-10 08:55:50 -0700[diff] [blame]6 */
7
8#include <common.h>
9#include <dm.h>
10#include <errno.h>
Simon Glass3834c842014-12-10 08:55:50 -0700[diff] [blame]11#include <i2c.h>
Simon Glass0f2af882020-05-10 11:40:05 -0600[diff] [blame]12#include <log.h>
Simon Glass3834c842014-12-10 08:55:50 -0700[diff] [blame]13#include <asm/test.h>
Simon Glass39ab8672020-07-07 13:11:48 -0600[diff] [blame]14#include <dm/acpi.h>
Simon Glass3834c842014-12-10 08:55:50 -0700[diff] [blame]15#include <dm/lists.h>
16#include <dm/device-internal.h>
Simon Glass3834c842014-12-10 08:55:50 -0700[diff] [blame]17
Simon Glass4c70ed92015-04-20 12:37:15 -0600[diff] [blame]18struct sandbox_i2c_priv {
19 bool test_mode;
Simon Glass3834c842014-12-10 08:55:50 -0700[diff] [blame]20};
21
22static int get_emul(struct udevice *dev, struct udevice **devp,
23 struct dm_i2c_ops **opsp)
24{
Simon Glass713c3f02015-01-25 08:27:13 -0700[diff] [blame]25 struct dm_i2c_chip *plat;
Simon Glass3834c842014-12-10 08:55:50 -0700[diff] [blame]26 int ret;
27
28 *devp = NULL;
29 *opsp = NULL;
Simon Glass713c3f02015-01-25 08:27:13 -0700[diff] [blame]30 plat = dev_get_parent_platdata(dev);
31 if (!plat->emul) {
Simon Glass17b56f62018-11-18 08:14:34 -0700[diff] [blame]32 ret = i2c_emul_find(dev, &plat->emul);
Simon Glass3834c842014-12-10 08:55:50 -0700[diff] [blame]33 if (ret)
34 return ret;
Simon Glass3834c842014-12-10 08:55:50 -0700[diff] [blame]35 }
Simon Glass713c3f02015-01-25 08:27:13 -0700[diff] [blame]36 *devp = plat->emul;
37 *opsp = i2c_get_ops(plat->emul);
Simon Glass3834c842014-12-10 08:55:50 -0700[diff] [blame]38
39 return 0;
40}
41
Simon Glass4c70ed92015-04-20 12:37:15 -0600[diff] [blame]42void sandbox_i2c_set_test_mode(struct udevice *bus, bool test_mode)
43{
44 struct sandbox_i2c_priv *priv = dev_get_priv(bus);
45
46 priv->test_mode = test_mode;
47}
48
Simon Glass3834c842014-12-10 08:55:50 -0700[diff] [blame]49static int sandbox_i2c_xfer(struct udevice *bus, struct i2c_msg *msg,
50 int nmsgs)
51{
Simon Glassde0977b2015-03-05 12:25:20 -0700[diff] [blame]52 struct dm_i2c_bus *i2c = dev_get_uclass_priv(bus);
Simon Glass4c70ed92015-04-20 12:37:15 -0600[diff] [blame]53 struct sandbox_i2c_priv *priv = dev_get_priv(bus);
Simon Glass3834c842014-12-10 08:55:50 -0700[diff] [blame]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 */
Simon Glass4c70ed92015-04-20 12:37:15 -0600[diff] [blame]60 if (priv->test_mode && msg->addr == SANDBOX_I2C_TEST_ADDR)
Simon Glass3834c842014-12-10 08:55:50 -0700[diff] [blame]61 return 0;
62
Simon Glassa2723ae2015-01-25 08:26:55 -0700[diff] [blame]63 ret = i2c_get_chip(bus, msg->addr, 1, &dev);
Simon Glass3834c842014-12-10 08:55:50 -0700[diff] [blame]64 if (ret)
65 return ret;
66
67 ret = get_emul(dev, &emul, &ops);
68 if (ret)
69 return ret;
70
Simon Glass4c70ed92015-04-20 12:37:15 -0600[diff] [blame]71 if (priv->test_mode) {
72 /*
73 * For testing, don't allow writing above 100KHz for writes and
74 * 400KHz for reads.
75 */
76 is_read = nmsgs > 1;
Simon Glassf0c99c52020-01-23 11:48:22 -0700[diff] [blame]77 if (i2c->speed_hz > (is_read ? I2C_SPEED_FAST_RATE :
78 I2C_SPEED_STANDARD_RATE)) {
Simon Glass4c70ed92015-04-20 12:37:15 -0600[diff] [blame]79 debug("%s: Max speed exceeded\n", __func__);
80 return -EINVAL;
81 }
Simon Glass34d8e952015-04-20 12:37:13 -0600[diff] [blame]82 }
Simon Glass4c70ed92015-04-20 12:37:15 -0600[diff] [blame]83
Simon Glass3834c842014-12-10 08:55:50 -0700[diff] [blame]84 return ops->xfer(emul, msg, nmsgs);
85}
86
87static const struct dm_i2c_ops sandbox_i2c_ops = {
88 .xfer = sandbox_i2c_xfer,
89};
90
Simon Glass3834c842014-12-10 08:55:50 -0700[diff] [blame]91static const struct udevice_id sandbox_i2c_ids[] = {
92 { .compatible = "sandbox,i2c" },
93 { }
94};
95
96U_BOOT_DRIVER(i2c_sandbox) = {
97 .name = "i2c_sandbox",
98 .id = UCLASS_I2C,
99 .of_match = sandbox_i2c_ids,
Simon Glass3834c842014-12-10 08:55:50 -0700[diff] [blame]100 .ops = &sandbox_i2c_ops,
Simon Glass4c70ed92015-04-20 12:37:15 -0600[diff] [blame]101 .priv_auto_alloc_size = sizeof(struct sandbox_i2c_priv),
Simon Glass3834c842014-12-10 08:55:50 -0700[diff] [blame]102};