// SPDX-License-Identifier: GPL-2.0-or-later /****************************************************************************** * Nuvoton TPM I2C Device Driver Interface for WPCT301/NPCT501/NPCT6XX, * based on the TCG TPM Interface Spec version 1.2. * Specifications at www.trustedcomputinggroup.org * * Copyright (C) 2011, Nuvoton Technology Corporation. * Dan Morav <[email protected]> * Copyright (C) 2013, Obsidian Research Corp. * Jason Gunthorpe <[email protected]> * * Nuvoton contact information: [email protected] *****************************************************************************/ #include <linux/init.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/slab.h> #include <linux/interrupt.h> #include <linux/wait.h> #include <linux/i2c.h> #include <linux/of.h> #include <linux/property.h> #include "tpm.h" /* I2C interface offsets */ #define TPM_STS … #define TPM_BURST_COUNT … #define TPM_DATA_FIFO_W … #define TPM_DATA_FIFO_R … #define TPM_VID_DID_RID … #define TPM_I2C_RETRIES … /* * I2C bus device maximum buffer size w/o counting I2C address or command * i.e. max size required for I2C write is 34 = addr, command, 32 bytes data */ #define TPM_I2C_MAX_BUF_SIZE … #define TPM_I2C_RETRY_COUNT … #define TPM_I2C_BUS_DELAY … #define TPM_I2C_RETRY_DELAY_SHORT … #define TPM_I2C_RETRY_DELAY_LONG … #define TPM_I2C_DELAY_RANGE … #define OF_IS_TPM2 … #define I2C_IS_TPM2 … struct priv_data { … }; static s32 i2c_nuvoton_read_buf(struct i2c_client *client, u8 offset, u8 size, u8 *data) { … } static s32 i2c_nuvoton_write_buf(struct i2c_client *client, u8 offset, u8 size, u8 *data) { … } #define TPM_STS_VALID … #define TPM_STS_COMMAND_READY … #define TPM_STS_GO … #define TPM_STS_DATA_AVAIL … #define TPM_STS_EXPECT … #define TPM_STS_RESPONSE_RETRY … #define TPM_STS_ERR_VAL … #define TPM_I2C_SHORT_TIMEOUT … #define TPM_I2C_LONG_TIMEOUT … /* read TPM_STS register */ static u8 i2c_nuvoton_read_status(struct tpm_chip *chip) { … } /* write byte to TPM_STS register */ static s32 i2c_nuvoton_write_status(struct i2c_client *client, u8 data) { … } /* write commandReady to TPM_STS register */ static void i2c_nuvoton_ready(struct tpm_chip *chip) { … } /* read burstCount field from TPM_STS register * return -1 on fail to read */ static int i2c_nuvoton_get_burstcount(struct i2c_client *client, struct tpm_chip *chip) { … } /* * WPCT301/NPCT501/NPCT6XX SINT# supports only dataAvail * any call to this function which is not waiting for dataAvail will * set queue to NULL to avoid waiting for interrupt */ static bool i2c_nuvoton_check_status(struct tpm_chip *chip, u8 mask, u8 value) { … } static int i2c_nuvoton_wait_for_stat(struct tpm_chip *chip, u8 mask, u8 value, u32 timeout, wait_queue_head_t *queue) { … } /* wait for dataAvail field to be set in the TPM_STS register */ static int i2c_nuvoton_wait_for_data_avail(struct tpm_chip *chip, u32 timeout, wait_queue_head_t *queue) { … } /* Read @count bytes into @buf from TPM_RD_FIFO register */ static int i2c_nuvoton_recv_data(struct i2c_client *client, struct tpm_chip *chip, u8 *buf, size_t count) { … } /* Read TPM command results */ static int i2c_nuvoton_recv(struct tpm_chip *chip, u8 *buf, size_t count) { … } /* * Send TPM command. * * If interrupts are used (signaled by an irq set in the vendor structure) * tpm.c can skip polling for the data to be available as the interrupt is * waited for here */ static int i2c_nuvoton_send(struct tpm_chip *chip, u8 *buf, size_t len) { … } static bool i2c_nuvoton_req_canceled(struct tpm_chip *chip, u8 status) { … } static const struct tpm_class_ops tpm_i2c = …; /* The only purpose for the handler is to signal to any waiting threads that * the interrupt is currently being asserted. The driver does not do any * processing triggered by interrupts, and the chip provides no way to mask at * the source (plus that would be slow over I2C). Run the IRQ as a one-shot, * this means it cannot be shared. */ static irqreturn_t i2c_nuvoton_int_handler(int dummy, void *dev_id) { … } static int get_vid(struct i2c_client *client, u32 *res) { … } static int i2c_nuvoton_probe(struct i2c_client *client) { … } static void i2c_nuvoton_remove(struct i2c_client *client) { … } static const struct i2c_device_id i2c_nuvoton_id[] = …; MODULE_DEVICE_TABLE(i2c, i2c_nuvoton_id); #ifdef CONFIG_OF static const struct of_device_id i2c_nuvoton_of_match[] = …; MODULE_DEVICE_TABLE(of, i2c_nuvoton_of_match); #endif static SIMPLE_DEV_PM_OPS(i2c_nuvoton_pm_ops, tpm_pm_suspend, tpm_pm_resume); static struct i2c_driver i2c_nuvoton_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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