1 // SPDX-License-Identifier: GPL-2.0
22 #include "atmel-i2c.h"
37  * atmel_i2c_checksum() - Generate 16-bit CRC as required by ATMEL ECC.
39  * The checksum is saved in little-endian format in the least significant
47 	u8 *data = &cmd->count;  in atmel_i2c_checksum()
48 	size_t len = cmd->count - CRC_SIZE;  in atmel_i2c_checksum()
56 	cmd->word_addr = COMMAND;  in atmel_i2c_init_read_config_cmd()
57 	cmd->opcode = OPCODE_READ;  in atmel_i2c_init_read_config_cmd()
62 	cmd->param1 = CONFIGURATION_ZONE;  in atmel_i2c_init_read_config_cmd()
63 	cmd->param2 = cpu_to_le16(DEVICE_LOCK_ADDR);  in atmel_i2c_init_read_config_cmd()
64 	cmd->count = READ_COUNT;  in atmel_i2c_init_read_config_cmd()
68 	cmd->msecs = MAX_EXEC_TIME_READ;  in atmel_i2c_init_read_config_cmd()
69 	cmd->rxsize = READ_RSP_SIZE;  in atmel_i2c_init_read_config_cmd()
76 		return -1;  in atmel_i2c_init_read_otp_cmd()
78 	cmd->word_addr = COMMAND;  in atmel_i2c_init_read_otp_cmd()
79 	cmd->opcode = OPCODE_READ;  in atmel_i2c_init_read_otp_cmd()
82 	 * numbers or similar if persistently pre-initialized and locked  in atmel_i2c_init_read_otp_cmd()
84 	cmd->param1 = OTP_ZONE;  in atmel_i2c_init_read_otp_cmd()
85 	cmd->param2 = cpu_to_le16(addr);  in atmel_i2c_init_read_otp_cmd()
86 	cmd->count = READ_COUNT;  in atmel_i2c_init_read_otp_cmd()
90 	cmd->msecs = MAX_EXEC_TIME_READ;  in atmel_i2c_init_read_otp_cmd()
91 	cmd->rxsize = READ_RSP_SIZE;  in atmel_i2c_init_read_otp_cmd()
99 	cmd->word_addr = COMMAND;  in atmel_i2c_init_random_cmd()
100 	cmd->opcode = OPCODE_RANDOM;  in atmel_i2c_init_random_cmd()
101 	cmd->param1 = 0;  in atmel_i2c_init_random_cmd()
102 	cmd->param2 = 0;  in atmel_i2c_init_random_cmd()
103 	cmd->count = RANDOM_COUNT;  in atmel_i2c_init_random_cmd()
107 	cmd->msecs = MAX_EXEC_TIME_RANDOM;  in atmel_i2c_init_random_cmd()
108 	cmd->rxsize = RANDOM_RSP_SIZE;  in atmel_i2c_init_random_cmd()
114 	cmd->word_addr = COMMAND;  in atmel_i2c_init_genkey_cmd()
115 	cmd->count = GENKEY_COUNT;  in atmel_i2c_init_genkey_cmd()
116 	cmd->opcode = OPCODE_GENKEY;  in atmel_i2c_init_genkey_cmd()
117 	cmd->param1 = GENKEY_MODE_PRIVATE;  in atmel_i2c_init_genkey_cmd()
119 	cmd->param2 = cpu_to_le16(keyid);  in atmel_i2c_init_genkey_cmd()
123 	cmd->msecs = MAX_EXEC_TIME_GENKEY;  in atmel_i2c_init_genkey_cmd()
124 	cmd->rxsize = GENKEY_RSP_SIZE;  in atmel_i2c_init_genkey_cmd()
133 	cmd->word_addr = COMMAND;  in atmel_i2c_init_ecdh_cmd()
134 	cmd->count = ECDH_COUNT;  in atmel_i2c_init_ecdh_cmd()
135 	cmd->opcode = OPCODE_ECDH;  in atmel_i2c_init_ecdh_cmd()
136 	cmd->param1 = ECDH_PREFIX_MODE;  in atmel_i2c_init_ecdh_cmd()
138 	cmd->param2 = cpu_to_le16(DATA_SLOT_2);  in atmel_i2c_init_ecdh_cmd()
148 				   cmd->data, ATMEL_ECC_PUBKEY_SIZE);  in atmel_i2c_init_ecdh_cmd()
150 		return -EINVAL;  in atmel_i2c_init_ecdh_cmd()
154 	cmd->msecs = MAX_EXEC_TIME_ECDH;  in atmel_i2c_init_ecdh_cmd()
155 	cmd->rxsize = ECDH_RSP_SIZE;  in atmel_i2c_init_ecdh_cmd()
200 	 * device is idle, asleep or during waking up. Don't check for error  in atmel_i2c_wakeup()
201 	 * when waking up the device.  in atmel_i2c_wakeup()
203 	i2c_transfer_buffer_flags(client, i2c_priv->wake_token,  in atmel_i2c_wakeup()
204 				i2c_priv->wake_token_sz, I2C_M_IGNORE_NAK);  in atmel_i2c_wakeup()
216 	return atmel_i2c_status(&client->dev, status);  in atmel_i2c_wakeup()
227  * atmel_i2c_send_receive() - send a command to the device and receive its
239  * wake it up again.
246 	mutex_lock(&i2c_priv->lock);  in atmel_i2c_send_receive()
253 	ret = i2c_master_send(client, (u8 *)cmd, cmd->count + WORD_ADDR_SIZE);  in atmel_i2c_send_receive()
258 	msleep(cmd->msecs);  in atmel_i2c_send_receive()
261 	ret = i2c_master_recv(client, cmd->data, cmd->rxsize);  in atmel_i2c_send_receive()
265 	/* put the device into low-power mode */  in atmel_i2c_send_receive()
270 	mutex_unlock(&i2c_priv->lock);  in atmel_i2c_send_receive()
271 	return atmel_i2c_status(&client->dev, cmd->data);  in atmel_i2c_send_receive()
273 	mutex_unlock(&i2c_priv->lock);  in atmel_i2c_send_receive()
282 	struct atmel_i2c_cmd *cmd = &work_data->cmd;  in atmel_i2c_work_handler()
283 	struct i2c_client *client = work_data->client;  in atmel_i2c_work_handler()
287 	work_data->cbk(work_data, work_data->areq, status);  in atmel_i2c_work_handler()
297 	work_data->cbk = (void *)cbk;  in atmel_i2c_enqueue()
298 	work_data->areq = areq;  in atmel_i2c_enqueue()
300 	INIT_WORK(&work_data->work, atmel_i2c_work_handler);  in atmel_i2c_enqueue()
301 	queue_work(atmel_wq, &work_data->work);  in atmel_i2c_enqueue()
326 		return -ENOMEM;  in device_sanity_check()
340 	if (cmd->data[LOCK_CONFIG_IDX] || cmd->data[LOCK_VALUE_IDX]) {  in device_sanity_check()
341 		dev_err(&client->dev, "Configuration or Data and OTP zones are unlocked!\n");  in device_sanity_check()
342 		ret = -ENOTSUPP;  in device_sanity_check()
354 	struct device *dev = &client->dev;  in atmel_i2c_probe()
358 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {  in atmel_i2c_probe()
360 		return -ENODEV;  in atmel_i2c_probe()
363 	bus_clk_rate = i2c_acpi_find_bus_speed(&client->adapter->dev);  in atmel_i2c_probe()
365 		ret = device_property_read_u32(&client->adapter->dev,  in atmel_i2c_probe()
366 					       "clock-frequency", &bus_clk_rate);  in atmel_i2c_probe()
368 			dev_err(dev, "failed to read clock-frequency property\n");  in atmel_i2c_probe()
376 		return -EINVAL;  in atmel_i2c_probe()
381 		return -ENOMEM;  in atmel_i2c_probe()
383 	i2c_priv->client = client;  in atmel_i2c_probe()
384 	mutex_init(&i2c_priv->lock);  in atmel_i2c_probe()
387 	 * WAKE_TOKEN_MAX_SIZE was calculated for the maximum bus_clk_rate -  in atmel_i2c_probe()
391 	i2c_priv->wake_token_sz = atmel_i2c_wake_token_sz(bus_clk_rate);  in atmel_i2c_probe()
393 	memset(i2c_priv->wake_token, 0, sizeof(i2c_priv->wake_token));  in atmel_i2c_probe()
395 	atomic_set(&i2c_priv->tfm_count, 0);  in atmel_i2c_probe()
406 	return atmel_wq ? 0 : -ENOMEM;  in atmel_i2c_init()