1 /* 2 * Simulate an I2C eeprom 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 <malloc.h> 15 #include <asm/test.h> 16 17 #ifdef DEBUG 18 #define debug_buffer print_buffer 19 #else 20 #define debug_buffer(x, ...) 21 #endif 22 23 DECLARE_GLOBAL_DATA_PTR; 24 25 struct sandbox_i2c_flash_plat_data { 26 enum sandbox_i2c_eeprom_test_mode test_mode; 27 const char *filename; 28 int offset_len; /* Length of an offset in bytes */ 29 int size; /* Size of data buffer */ 30 }; 31 32 struct sandbox_i2c_flash { 33 uint8_t *data; 34 }; 35 36 void sandbox_i2c_eeprom_set_test_mode(struct udevice *dev, 37 enum sandbox_i2c_eeprom_test_mode mode) 38 { 39 struct sandbox_i2c_flash_plat_data *plat = dev_get_platdata(dev); 40 41 plat->test_mode = mode; 42 } 43 44 void sandbox_i2c_eeprom_set_offset_len(struct udevice *dev, int offset_len) 45 { 46 struct sandbox_i2c_flash_plat_data *plat = dev_get_platdata(dev); 47 48 plat->offset_len = offset_len; 49 } 50 51 static int sandbox_i2c_eeprom_xfer(struct udevice *emul, struct i2c_msg *msg, 52 int nmsgs) 53 { 54 struct sandbox_i2c_flash *priv = dev_get_priv(emul); 55 uint offset = 0; 56 57 debug("\n%s\n", __func__); 58 debug_buffer(0, priv->data, 1, 16, 0); 59 for (; nmsgs > 0; nmsgs--, msg++) { 60 struct sandbox_i2c_flash_plat_data *plat = 61 dev_get_platdata(emul); 62 int len; 63 u8 *ptr; 64 65 if (!plat->size) 66 return -ENODEV; 67 if (msg->addr + msg->len > plat->size) { 68 debug("%s: Address %x, len %x is outside range 0..%x\n", 69 __func__, msg->addr, msg->len, plat->size); 70 return -EINVAL; 71 } 72 len = msg->len; 73 debug(" %s: msg->len=%d", 74 msg->flags & I2C_M_RD ? "read" : "write", 75 msg->len); 76 if (msg->flags & I2C_M_RD) { 77 if (plat->test_mode == SIE_TEST_MODE_SINGLE_BYTE) 78 len = 1; 79 debug(", offset %x, len %x: ", offset, len); 80 memcpy(msg->buf, priv->data + offset, len); 81 memset(msg->buf + len, '\xff', msg->len - len); 82 debug_buffer(0, msg->buf, 1, msg->len, 0); 83 } else if (len >= plat->offset_len) { 84 int i; 85 86 ptr = msg->buf; 87 for (i = 0; i < plat->offset_len; i++, len--) 88 offset = (offset << 8) | *ptr++; 89 debug(", set offset %x: ", offset); 90 debug_buffer(0, msg->buf, 1, msg->len, 0); 91 if (plat->test_mode == SIE_TEST_MODE_SINGLE_BYTE) 92 len = min(len, 1); 93 94 /* For testing, map offsets into our limited buffer */ 95 for (i = 24; i > 0; i -= 8) { 96 if (offset > (1 << i)) { 97 offset = (offset >> i) | 98 (offset & ((1 << i) - 1)); 99 offset += i; 100 } 101 } 102 memcpy(priv->data + offset, ptr, len); 103 } 104 } 105 debug_buffer(0, priv->data, 1, 16, 0); 106 107 return 0; 108 } 109 110 struct dm_i2c_ops sandbox_i2c_emul_ops = { 111 .xfer = sandbox_i2c_eeprom_xfer, 112 }; 113 114 static int sandbox_i2c_eeprom_ofdata_to_platdata(struct udevice *dev) 115 { 116 struct sandbox_i2c_flash_plat_data *plat = dev_get_platdata(dev); 117 118 plat->size = fdtdec_get_int(gd->fdt_blob, dev->of_offset, 119 "sandbox,size", 32); 120 plat->filename = fdt_getprop(gd->fdt_blob, dev->of_offset, 121 "sandbox,filename", NULL); 122 if (!plat->filename) { 123 debug("%s: No filename for device '%s'\n", __func__, 124 dev->name); 125 return -EINVAL; 126 } 127 plat->test_mode = SIE_TEST_MODE_NONE; 128 plat->offset_len = 1; 129 130 return 0; 131 } 132 133 static int sandbox_i2c_eeprom_probe(struct udevice *dev) 134 { 135 struct sandbox_i2c_flash_plat_data *plat = dev_get_platdata(dev); 136 struct sandbox_i2c_flash *priv = dev_get_priv(dev); 137 138 priv->data = calloc(1, plat->size); 139 if (!priv->data) 140 return -ENOMEM; 141 142 return 0; 143 } 144 145 static int sandbox_i2c_eeprom_remove(struct udevice *dev) 146 { 147 struct sandbox_i2c_flash *priv = dev_get_priv(dev); 148 149 free(priv->data); 150 151 return 0; 152 } 153 154 static const struct udevice_id sandbox_i2c_ids[] = { 155 { .compatible = "sandbox,i2c-eeprom" }, 156 { } 157 }; 158 159 U_BOOT_DRIVER(sandbox_i2c_emul) = { 160 .name = "sandbox_i2c_eeprom_emul", 161 .id = UCLASS_I2C_EMUL, 162 .of_match = sandbox_i2c_ids, 163 .ofdata_to_platdata = sandbox_i2c_eeprom_ofdata_to_platdata, 164 .probe = sandbox_i2c_eeprom_probe, 165 .remove = sandbox_i2c_eeprom_remove, 166 .priv_auto_alloc_size = sizeof(struct sandbox_i2c_flash), 167 .platdata_auto_alloc_size = sizeof(struct sandbox_i2c_flash_plat_data), 168 .ops = &sandbox_i2c_emul_ops, 169 }; 170