// SPDX-License-Identifier: GPL-2.0-only /* ------------------------------------------------------------------------- */ /* i2c-iop3xx.c i2c driver algorithms for Intel XScale IOP3xx & IXP46x */ /* ------------------------------------------------------------------------- */ /* Copyright (C) 2003 Peter Milne, D-TACQ Solutions Ltd * <Peter dot Milne at D hyphen TACQ dot com> * * With acknowledgements to i2c-algo-ibm_ocp.c by * Ian DaSilva, MontaVista Software, Inc. [email protected] * * And i2c-algo-pcf.c, which was created by Simon G. Vogl and Hans Berglund: * * Copyright (C) 1995-1997 Simon G. Vogl, 1998-2000 Hans Berglund * * And which acknowledged Kyösti Mälkki <[email protected]>, * Frodo Looijaard <[email protected]>, Martin Bailey<[email protected]> * * Major cleanup by Deepak Saxena <[email protected]>, 01/2005: * * - Use driver model to pass per-chip info instead of hardcoding and #ifdefs * - Use ioremap/__raw_readl/__raw_writel instead of direct dereference * - Make it work with IXP46x chips * - Cleanup function names, coding style, etc * * - writing to local target address causes latchup on iop331. * fix: driver refuses to address self. */ #include <linux/interrupt.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/delay.h> #include <linux/slab.h> #include <linux/errno.h> #include <linux/platform_device.h> #include <linux/i2c.h> #include <linux/io.h> #include <linux/gpio/consumer.h> #include "i2c-iop3xx.h" /* global unit counter */ static int i2c_id; static inline unsigned char iic_cook_addr(struct i2c_msg *msg) { … } static void iop3xx_i2c_reset(struct i2c_algo_iop3xx_data *iop3xx_adap) { … } static void iop3xx_i2c_enable(struct i2c_algo_iop3xx_data *iop3xx_adap) { … } static void iop3xx_i2c_transaction_cleanup(struct i2c_algo_iop3xx_data *iop3xx_adap) { … } /* * NB: the handler has to clear the source of the interrupt! * Then it passes the SR flags of interest to BH via adap data */ static irqreturn_t iop3xx_i2c_irq_handler(int this_irq, void *dev_id) { … } /* check all error conditions, clear them , report most important */ static int iop3xx_i2c_error(u32 sr) { … } static inline u32 iop3xx_i2c_get_srstat(struct i2c_algo_iop3xx_data *iop3xx_adap) { … } /* * sleep until interrupted, then recover and analyse the SR * saved by handler */ compare_func; /* returns 1 on correct comparison */ static int iop3xx_i2c_wait_event(struct i2c_algo_iop3xx_data *iop3xx_adap, unsigned flags, unsigned *status, compare_func compare) { … } /* * Concrete compare_funcs */ static int all_bits_clear(unsigned test, unsigned mask) { … } static int any_bits_set(unsigned test, unsigned mask) { … } static int iop3xx_i2c_wait_tx_done(struct i2c_algo_iop3xx_data *iop3xx_adap, int *status) { … } static int iop3xx_i2c_wait_rx_done(struct i2c_algo_iop3xx_data *iop3xx_adap, int *status) { … } static int iop3xx_i2c_wait_idle(struct i2c_algo_iop3xx_data *iop3xx_adap, int *status) { … } static int iop3xx_i2c_send_target_addr(struct i2c_algo_iop3xx_data *iop3xx_adap, struct i2c_msg *msg) { … } static int iop3xx_i2c_write_byte(struct i2c_algo_iop3xx_data *iop3xx_adap, char byte, int stop) { … } static int iop3xx_i2c_read_byte(struct i2c_algo_iop3xx_data *iop3xx_adap, char *byte, int stop) { … } static int iop3xx_i2c_writebytes(struct i2c_adapter *i2c_adap, const char *buf, int count) { … } static int iop3xx_i2c_readbytes(struct i2c_adapter *i2c_adap, char *buf, int count) { … } /* * Description: This function implements combined transactions. Combined * transactions consist of combinations of reading and writing blocks of data. * FROM THE SAME ADDRESS * Each transfer (i.e. a read or a write) is separated by a repeated start * condition. */ static int iop3xx_i2c_handle_msg(struct i2c_adapter *i2c_adap, struct i2c_msg *pmsg) { … } static int iop3xx_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num) { … } static u32 iop3xx_i2c_func(struct i2c_adapter *adap) { … } static const struct i2c_algorithm iop3xx_i2c_algo = …; static void iop3xx_i2c_remove(struct platform_device *pdev) { … } static int iop3xx_i2c_probe(struct platform_device *pdev) { … } static const struct of_device_id i2c_iop3xx_match[] = …; MODULE_DEVICE_TABLE(of, i2c_iop3xx_match); static struct platform_driver iop3xx_i2c_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_ALIAS(…) …;
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