/*
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* Simulate an I2C eeprom
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*
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* Copyright (c) 2014 Google, Inc
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <i2c.h>
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#include <malloc.h>
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#include <asm/test.h>
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#ifdef DEBUG
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#define debug_buffer print_buffer
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#else
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#define debug_buffer(x, ...)
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#endif
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DECLARE_GLOBAL_DATA_PTR;
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struct sandbox_i2c_flash_plat_data {
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enum sandbox_i2c_eeprom_test_mode test_mode;
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const char *filename;
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int offset_len; /* Length of an offset in bytes */
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int size; /* Size of data buffer */
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};
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struct sandbox_i2c_flash {
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uint8_t *data;
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};
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void sandbox_i2c_eeprom_set_test_mode(struct udevice *dev,
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enum sandbox_i2c_eeprom_test_mode mode)
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{
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struct sandbox_i2c_flash_plat_data *plat = dev_get_platdata(dev);
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plat->test_mode = mode;
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}
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void sandbox_i2c_eeprom_set_offset_len(struct udevice *dev, int offset_len)
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{
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struct sandbox_i2c_flash_plat_data *plat = dev_get_platdata(dev);
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plat->offset_len = offset_len;
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}
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static int sandbox_i2c_eeprom_xfer(struct udevice *emul, struct i2c_msg *msg,
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int nmsgs)
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{
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struct sandbox_i2c_flash *priv = dev_get_priv(emul);
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uint offset = 0;
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debug("\n%s\n", __func__);
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debug_buffer(0, priv->data, 1, 16, 0);
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for (; nmsgs > 0; nmsgs--, msg++) {
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struct sandbox_i2c_flash_plat_data *plat =
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dev_get_platdata(emul);
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int len;
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u8 *ptr;
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if (!plat->size)
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return -ENODEV;
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if (msg->addr + msg->len > plat->size) {
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debug("%s: Address %x, len %x is outside range 0..%x\n",
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__func__, msg->addr, msg->len, plat->size);
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return -EINVAL;
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}
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len = msg->len;
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debug(" %s: msg->len=%d",
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msg->flags & I2C_M_RD ? "read" : "write",
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msg->len);
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if (msg->flags & I2C_M_RD) {
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if (plat->test_mode == SIE_TEST_MODE_SINGLE_BYTE)
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len = 1;
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debug(", offset %x, len %x: ", offset, len);
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memcpy(msg->buf, priv->data + offset, len);
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memset(msg->buf + len, '\xff', msg->len - len);
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debug_buffer(0, msg->buf, 1, msg->len, 0);
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} else if (len >= plat->offset_len) {
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int i;
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ptr = msg->buf;
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for (i = 0; i < plat->offset_len; i++, len--)
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offset = (offset << 8) | *ptr++;
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debug(", set offset %x: ", offset);
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debug_buffer(0, msg->buf, 1, msg->len, 0);
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if (plat->test_mode == SIE_TEST_MODE_SINGLE_BYTE)
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len = min(len, 1);
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/* For testing, map offsets into our limited buffer */
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for (i = 24; i > 0; i -= 8) {
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if (offset > (1 << i)) {
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offset = (offset >> i) |
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(offset & ((1 << i) - 1));
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offset += i;
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}
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}
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memcpy(priv->data + offset, ptr, len);
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}
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}
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debug_buffer(0, priv->data, 1, 16, 0);
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return 0;
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}
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struct dm_i2c_ops sandbox_i2c_emul_ops = {
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.xfer = sandbox_i2c_eeprom_xfer,
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};
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static int sandbox_i2c_eeprom_ofdata_to_platdata(struct udevice *dev)
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{
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struct sandbox_i2c_flash_plat_data *plat = dev_get_platdata(dev);
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plat->size = dev_read_u32_default(dev, "sandbox,size", 32);
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plat->filename = dev_read_string(dev, "sandbox,filename");
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if (!plat->filename) {
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debug("%s: No filename for device '%s'\n", __func__,
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dev->name);
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return -EINVAL;
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}
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plat->test_mode = SIE_TEST_MODE_NONE;
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plat->offset_len = 1;
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return 0;
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}
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static int sandbox_i2c_eeprom_probe(struct udevice *dev)
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{
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struct sandbox_i2c_flash_plat_data *plat = dev_get_platdata(dev);
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struct sandbox_i2c_flash *priv = dev_get_priv(dev);
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priv->data = calloc(1, plat->size);
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if (!priv->data)
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return -ENOMEM;
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return 0;
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}
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static int sandbox_i2c_eeprom_remove(struct udevice *dev)
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{
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struct sandbox_i2c_flash *priv = dev_get_priv(dev);
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free(priv->data);
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return 0;
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}
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static const struct udevice_id sandbox_i2c_ids[] = {
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{ .compatible = "sandbox,i2c-eeprom" },
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{ }
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};
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U_BOOT_DRIVER(sandbox_i2c_emul) = {
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.name = "sandbox_i2c_eeprom_emul",
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.id = UCLASS_I2C_EMUL,
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.of_match = sandbox_i2c_ids,
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.ofdata_to_platdata = sandbox_i2c_eeprom_ofdata_to_platdata,
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.probe = sandbox_i2c_eeprom_probe,
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.remove = sandbox_i2c_eeprom_remove,
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.priv_auto_alloc_size = sizeof(struct sandbox_i2c_flash),
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.platdata_auto_alloc_size = sizeof(struct sandbox_i2c_flash_plat_data),
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.ops = &sandbox_i2c_emul_ops,
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};
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