// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2011 LAPIS Semiconductor Co., Ltd. */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/delay.h> #include <linux/errno.h> #include <linux/i2c.h> #include <linux/fs.h> #include <linux/io.h> #include <linux/types.h> #include <linux/interrupt.h> #include <linux/jiffies.h> #include <linux/pci.h> #include <linux/mutex.h> #include <linux/ktime.h> #include <linux/slab.h> #define PCH_EVENT_SET … #define PCH_EVENT_NONE … #define PCH_MAX_CLK … #define PCH_BUFFER_MODE_ENABLE … #define PCH_EEPROM_SW_RST_MODE_ENABLE … #define PCH_I2CSADR … #define PCH_I2CCTL … #define PCH_I2CSR … #define PCH_I2CDR … #define PCH_I2CMON … #define PCH_I2CBC … #define PCH_I2CMOD … #define PCH_I2CBUFSLV … #define PCH_I2CBUFSUB … #define PCH_I2CBUFFOR … #define PCH_I2CBUFCTL … #define PCH_I2CBUFMSK … #define PCH_I2CBUFSTA … #define PCH_I2CBUFLEV … #define PCH_I2CESRFOR … #define PCH_I2CESRCTL … #define PCH_I2CESRMSK … #define PCH_I2CESRSTA … #define PCH_I2CTMR … #define PCH_I2CSRST … #define PCH_I2CNF … #define BUS_IDLE_TIMEOUT … #define PCH_I2CCTL_I2CMEN … #define TEN_BIT_ADDR_DEFAULT … #define TEN_BIT_ADDR_MASK … #define PCH_START … #define PCH_RESTART … #define PCH_ESR_START … #define PCH_BUFF_START … #define PCH_REPSTART … #define PCH_ACK … #define PCH_GETACK … #define CLR_REG … #define I2C_RD … #define I2CMCF_BIT … #define I2CMIF_BIT … #define I2CMAL_BIT … #define I2CBMFI_BIT … #define I2CBMAL_BIT … #define I2CBMNA_BIT … #define I2CBMTO_BIT … #define I2CBMIS_BIT … #define I2CESRFI_BIT … #define I2CESRTO_BIT … #define I2CESRFIIE_BIT … #define I2CESRTOIE_BIT … #define I2CBMDZ_BIT … #define I2CBMAG_BIT … #define I2CMBB_BIT … #define BUFFER_MODE_MASK … #define I2C_ADDR_MSK … #define I2C_MSB_2B_MSK … #define FAST_MODE_CLK … #define FAST_MODE_EN … #define SUB_ADDR_LEN_MAX … #define BUF_LEN_MAX … #define PCH_BUFFER_MODE … #define EEPROM_SW_RST_MODE … #define NORMAL_INTR_ENBL … #define EEPROM_RST_INTR_ENBL … #define EEPROM_RST_INTR_DISBL … #define BUFFER_MODE_INTR_ENBL … #define BUFFER_MODE_INTR_DISBL … #define NORMAL_MODE … #define BUFFER_MODE … #define EEPROM_SR_MODE … #define I2C_TX_MODE … #define PCH_BUF_TX … #define PCH_BUF_RD … #define I2C_ERROR_MASK … #define I2CMAL_EVENT … #define I2CMCF_EVENT … #define I2CBMFI_EVENT … #define I2CBMAL_EVENT … #define I2CBMNA_EVENT … #define I2CBMTO_EVENT … #define I2CBMIS_EVENT … #define I2CESRFI_EVENT … #define I2CESRTO_EVENT … #define PCI_DEVICE_ID_PCH_I2C … #define pch_dbg(adap, fmt, arg...) … #define pch_err(adap, fmt, arg...) … #define pch_pci_err(pdev, fmt, arg...) … #define pch_pci_dbg(pdev, fmt, arg...) … /* Set the number of I2C instance max Intel EG20T PCH : 1ch LAPIS Semiconductor ML7213 IOH : 2ch LAPIS Semiconductor ML7831 IOH : 1ch */ #define PCH_I2C_MAX_DEV … /** * struct i2c_algo_pch_data - for I2C driver functionalities * @pch_adapter: stores the reference to i2c_adapter structure * @p_adapter_info: stores the reference to adapter_info structure * @pch_base_address: specifies the remapped base address * @pch_buff_mode_en: specifies if buffer mode is enabled * @pch_event_flag: specifies occurrence of interrupt events * @pch_i2c_xfer_in_progress: specifies whether the transfer is completed */ struct i2c_algo_pch_data { … }; /** * struct adapter_info - This structure holds the adapter information for the * PCH i2c controller * @pch_data: stores a list of i2c_algo_pch_data * @pch_i2c_suspended: specifies whether the system is suspended or not * perhaps with more lines and words. * @ch_num: specifies the number of i2c instance * * pch_data has as many elements as maximum I2C channels */ struct adapter_info { … }; static int pch_i2c_speed = …; /* I2C bus speed in Kbps */ static int pch_clk = …; /* specifies I2C clock speed in KHz */ static wait_queue_head_t pch_event; static DEFINE_MUTEX(pch_mutex); /* Definition for ML7213 by LAPIS Semiconductor */ #define PCI_DEVICE_ID_ML7213_I2C … #define PCI_DEVICE_ID_ML7223_I2C … #define PCI_DEVICE_ID_ML7831_I2C … static const struct pci_device_id pch_pcidev_id[] = …; MODULE_DEVICE_TABLE(pci, pch_pcidev_id); static irqreturn_t pch_i2c_handler(int irq, void *pData); static inline void pch_setbit(void __iomem *addr, u32 offset, u32 bitmask) { … } static inline void pch_clrbit(void __iomem *addr, u32 offset, u32 bitmask) { … } /** * pch_i2c_init() - hardware initialization of I2C module * @adap: Pointer to struct i2c_algo_pch_data. */ static void pch_i2c_init(struct i2c_algo_pch_data *adap) { … } /** * pch_i2c_wait_for_bus_idle() - check the status of bus. * @adap: Pointer to struct i2c_algo_pch_data. * @timeout: waiting time counter (ms). */ static s32 pch_i2c_wait_for_bus_idle(struct i2c_algo_pch_data *adap, s32 timeout) { … } /** * pch_i2c_start() - Generate I2C start condition in normal mode. * @adap: Pointer to struct i2c_algo_pch_data. * * Generate I2C start condition in normal mode by setting I2CCTL.I2CMSTA to 1. */ static void pch_i2c_start(struct i2c_algo_pch_data *adap) { … } /** * pch_i2c_stop() - generate stop condition in normal mode. * @adap: Pointer to struct i2c_algo_pch_data. */ static void pch_i2c_stop(struct i2c_algo_pch_data *adap) { … } static int pch_i2c_wait_for_check_xfer(struct i2c_algo_pch_data *adap) { … } /** * pch_i2c_repstart() - generate repeated start condition in normal mode * @adap: Pointer to struct i2c_algo_pch_data. */ static void pch_i2c_repstart(struct i2c_algo_pch_data *adap) { … } /** * pch_i2c_writebytes() - write data to I2C bus in normal mode * @i2c_adap: Pointer to the struct i2c_adapter. * @msgs: Pointer to the i2c message structure. * @last: specifies whether last message or not. * In the case of compound mode it will be 1 for last message, * otherwise 0. * @first: specifies whether first message or not. * 1 for first message otherwise 0. */ static s32 pch_i2c_writebytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, u32 last, u32 first) { … } /** * pch_i2c_sendack() - send ACK * @adap: Pointer to struct i2c_algo_pch_data. */ static void pch_i2c_sendack(struct i2c_algo_pch_data *adap) { … } /** * pch_i2c_sendnack() - send NACK * @adap: Pointer to struct i2c_algo_pch_data. */ static void pch_i2c_sendnack(struct i2c_algo_pch_data *adap) { … } /** * pch_i2c_restart() - Generate I2C restart condition in normal mode. * @adap: Pointer to struct i2c_algo_pch_data. * * Generate I2C restart condition in normal mode by setting I2CCTL.I2CRSTA. */ static void pch_i2c_restart(struct i2c_algo_pch_data *adap) { … } /** * pch_i2c_readbytes() - read data from I2C bus in normal mode. * @i2c_adap: Pointer to the struct i2c_adapter. * @msgs: Pointer to i2c_msg structure. * @last: specifies whether last message or not. * @first: specifies whether first message or not. */ static s32 pch_i2c_readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, u32 last, u32 first) { … } /** * pch_i2c_cb() - Interrupt handler Call back function * @adap: Pointer to struct i2c_algo_pch_data. */ static void pch_i2c_cb(struct i2c_algo_pch_data *adap) { … } /** * pch_i2c_handler() - interrupt handler for the PCH I2C controller * @irq: irq number. * @pData: cookie passed back to the handler function. */ static irqreturn_t pch_i2c_handler(int irq, void *pData) { … } /** * pch_i2c_xfer() - Reading adnd writing data through I2C bus * @i2c_adap: Pointer to the struct i2c_adapter. * @msgs: Pointer to i2c_msg structure. * @num: number of messages. */ static s32 pch_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, s32 num) { … } /** * pch_i2c_func() - return the functionality of the I2C driver * @adap: Pointer to struct i2c_algo_pch_data. */ static u32 pch_i2c_func(struct i2c_adapter *adap) { … } static const struct i2c_algorithm pch_algorithm = …; /** * pch_i2c_disbl_int() - Disable PCH I2C interrupts * @adap: Pointer to struct i2c_algo_pch_data. */ static void pch_i2c_disbl_int(struct i2c_algo_pch_data *adap) { … } static int pch_i2c_probe(struct pci_dev *pdev, const struct pci_device_id *id) { … } static void pch_i2c_remove(struct pci_dev *pdev) { … } static int __maybe_unused pch_i2c_suspend(struct device *dev) { … } static int __maybe_unused pch_i2c_resume(struct device *dev) { … } static SIMPLE_DEV_PM_OPS(pch_i2c_pm_ops, pch_i2c_suspend, pch_i2c_resume); static struct pci_driver pch_pcidriver = …; module_pci_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_AUTHOR(…) …; module_param(pch_i2c_speed, int, (S_IRUSR | S_IWUSR)); module_param(pch_clk, int, (S_IRUSR | S_IWUSR));
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