1*d19de0d3SSimon Glass /* 2*d19de0d3SSimon Glass * Simulate an I2C port 3*d19de0d3SSimon Glass * 4*d19de0d3SSimon Glass * Copyright (c) 2014 Google, Inc 5*d19de0d3SSimon Glass * 6*d19de0d3SSimon Glass * SPDX-License-Identifier: GPL-2.0+ 7*d19de0d3SSimon Glass */ 8*d19de0d3SSimon Glass 9*d19de0d3SSimon Glass #include <common.h> 10*d19de0d3SSimon Glass #include <dm.h> 11*d19de0d3SSimon Glass #include <errno.h> 12*d19de0d3SSimon Glass #include <fdtdec.h> 13*d19de0d3SSimon Glass #include <i2c.h> 14*d19de0d3SSimon Glass #include <asm/test.h> 15*d19de0d3SSimon Glass #include <dm/lists.h> 16*d19de0d3SSimon Glass #include <dm/device-internal.h> 17*d19de0d3SSimon Glass #include <dm/root.h> 18*d19de0d3SSimon Glass 19*d19de0d3SSimon Glass DECLARE_GLOBAL_DATA_PTR; 20*d19de0d3SSimon Glass 21*d19de0d3SSimon Glass struct dm_sandbox_i2c_emul_priv { 22*d19de0d3SSimon Glass struct udevice *emul; 23*d19de0d3SSimon Glass }; 24*d19de0d3SSimon Glass 25*d19de0d3SSimon Glass static int get_emul(struct udevice *dev, struct udevice **devp, 26*d19de0d3SSimon Glass struct dm_i2c_ops **opsp) 27*d19de0d3SSimon Glass { 28*d19de0d3SSimon Glass struct dm_i2c_chip *priv; 29*d19de0d3SSimon Glass int ret; 30*d19de0d3SSimon Glass 31*d19de0d3SSimon Glass *devp = NULL; 32*d19de0d3SSimon Glass *opsp = NULL; 33*d19de0d3SSimon Glass priv = dev_get_parentdata(dev); 34*d19de0d3SSimon Glass if (!priv->emul) { 35*d19de0d3SSimon Glass ret = dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, 36*d19de0d3SSimon Glass false); 37*d19de0d3SSimon Glass if (ret) 38*d19de0d3SSimon Glass return ret; 39*d19de0d3SSimon Glass 40*d19de0d3SSimon Glass ret = device_get_child(dev, 0, &priv->emul); 41*d19de0d3SSimon Glass if (ret) 42*d19de0d3SSimon Glass return ret; 43*d19de0d3SSimon Glass } 44*d19de0d3SSimon Glass *devp = priv->emul; 45*d19de0d3SSimon Glass *opsp = i2c_get_ops(priv->emul); 46*d19de0d3SSimon Glass 47*d19de0d3SSimon Glass return 0; 48*d19de0d3SSimon Glass } 49*d19de0d3SSimon Glass 50*d19de0d3SSimon Glass static int sandbox_i2c_xfer(struct udevice *bus, struct i2c_msg *msg, 51*d19de0d3SSimon Glass int nmsgs) 52*d19de0d3SSimon Glass { 53*d19de0d3SSimon Glass struct dm_i2c_bus *i2c = bus->uclass_priv; 54*d19de0d3SSimon Glass struct dm_i2c_ops *ops; 55*d19de0d3SSimon Glass struct udevice *emul, *dev; 56*d19de0d3SSimon Glass bool is_read; 57*d19de0d3SSimon Glass int ret; 58*d19de0d3SSimon Glass 59*d19de0d3SSimon Glass /* Special test code to return success but with no emulation */ 60*d19de0d3SSimon Glass if (msg->addr == SANDBOX_I2C_TEST_ADDR) 61*d19de0d3SSimon Glass return 0; 62*d19de0d3SSimon Glass 63*d19de0d3SSimon Glass ret = i2c_get_chip(bus, msg->addr, &dev); 64*d19de0d3SSimon Glass if (ret) 65*d19de0d3SSimon Glass return ret; 66*d19de0d3SSimon Glass 67*d19de0d3SSimon Glass ret = get_emul(dev, &emul, &ops); 68*d19de0d3SSimon Glass if (ret) 69*d19de0d3SSimon Glass return ret; 70*d19de0d3SSimon Glass 71*d19de0d3SSimon Glass /* 72*d19de0d3SSimon Glass * For testing, don't allow writing above 100KHz for writes and 73*d19de0d3SSimon Glass * 400KHz for reads 74*d19de0d3SSimon Glass */ 75*d19de0d3SSimon Glass is_read = nmsgs > 1; 76*d19de0d3SSimon Glass if (i2c->speed_hz > (is_read ? 400000 : 100000)) 77*d19de0d3SSimon Glass return -EINVAL; 78*d19de0d3SSimon Glass return ops->xfer(emul, msg, nmsgs); 79*d19de0d3SSimon Glass } 80*d19de0d3SSimon Glass 81*d19de0d3SSimon Glass static const struct dm_i2c_ops sandbox_i2c_ops = { 82*d19de0d3SSimon Glass .xfer = sandbox_i2c_xfer, 83*d19de0d3SSimon Glass }; 84*d19de0d3SSimon Glass 85*d19de0d3SSimon Glass static int sandbox_i2c_child_pre_probe(struct udevice *dev) 86*d19de0d3SSimon Glass { 87*d19de0d3SSimon Glass struct dm_i2c_chip *i2c_chip = dev_get_parentdata(dev); 88*d19de0d3SSimon Glass 89*d19de0d3SSimon Glass /* Ignore our test address */ 90*d19de0d3SSimon Glass if (i2c_chip->chip_addr == SANDBOX_I2C_TEST_ADDR) 91*d19de0d3SSimon Glass return 0; 92*d19de0d3SSimon Glass if (dev->of_offset == -1) 93*d19de0d3SSimon Glass return 0; 94*d19de0d3SSimon Glass 95*d19de0d3SSimon Glass return i2c_chip_ofdata_to_platdata(gd->fdt_blob, dev->of_offset, 96*d19de0d3SSimon Glass i2c_chip); 97*d19de0d3SSimon Glass } 98*d19de0d3SSimon Glass 99*d19de0d3SSimon Glass static const struct udevice_id sandbox_i2c_ids[] = { 100*d19de0d3SSimon Glass { .compatible = "sandbox,i2c" }, 101*d19de0d3SSimon Glass { } 102*d19de0d3SSimon Glass }; 103*d19de0d3SSimon Glass 104*d19de0d3SSimon Glass U_BOOT_DRIVER(i2c_sandbox) = { 105*d19de0d3SSimon Glass .name = "i2c_sandbox", 106*d19de0d3SSimon Glass .id = UCLASS_I2C, 107*d19de0d3SSimon Glass .of_match = sandbox_i2c_ids, 108*d19de0d3SSimon Glass .per_child_auto_alloc_size = sizeof(struct dm_i2c_chip), 109*d19de0d3SSimon Glass .child_pre_probe = sandbox_i2c_child_pre_probe, 110*d19de0d3SSimon Glass .ops = &sandbox_i2c_ops, 111*d19de0d3SSimon Glass }; 112