/* * Driver for the i2c controller on the Marvell line of host bridges * (e.g, gt642[46]0, mv643[46]0, mv644[46]0, and Orion SoC family). * * Author: Mark A. Greer <[email protected]> * * 2005 (c) MontaVista, Software, Inc. This file is licensed under * the terms of the GNU General Public License version 2. This program * is licensed "as is" without any warranty of any kind, whether express * or implied. */ #include <linux/kernel.h> #include <linux/slab.h> #include <linux/module.h> #include <linux/spinlock.h> #include <linux/i2c.h> #include <linux/interrupt.h> #include <linux/mv643xx_i2c.h> #include <linux/platform_device.h> #include <linux/pinctrl/consumer.h> #include <linux/pm_runtime.h> #include <linux/property.h> #include <linux/reset.h> #include <linux/io.h> #include <linux/of.h> #include <linux/clk.h> #include <linux/err.h> #include <linux/delay.h> #define MV64XXX_I2C_ADDR_ADDR(val) … #define MV64XXX_I2C_BAUD_DIV_N(val) … #define MV64XXX_I2C_BAUD_DIV_M(val) … #define MV64XXX_I2C_REG_CONTROL_ACK … #define MV64XXX_I2C_REG_CONTROL_IFLG … #define MV64XXX_I2C_REG_CONTROL_STOP … #define MV64XXX_I2C_REG_CONTROL_START … #define MV64XXX_I2C_REG_CONTROL_TWSIEN … #define MV64XXX_I2C_REG_CONTROL_INTEN … /* Ctlr status values */ #define MV64XXX_I2C_STATUS_BUS_ERR … #define MV64XXX_I2C_STATUS_MAST_START … #define MV64XXX_I2C_STATUS_MAST_REPEAT_START … #define MV64XXX_I2C_STATUS_MAST_WR_ADDR_ACK … #define MV64XXX_I2C_STATUS_MAST_WR_ADDR_NO_ACK … #define MV64XXX_I2C_STATUS_MAST_WR_ACK … #define MV64XXX_I2C_STATUS_MAST_WR_NO_ACK … #define MV64XXX_I2C_STATUS_MAST_LOST_ARB … #define MV64XXX_I2C_STATUS_MAST_RD_ADDR_ACK … #define MV64XXX_I2C_STATUS_MAST_RD_ADDR_NO_ACK … #define MV64XXX_I2C_STATUS_MAST_RD_DATA_ACK … #define MV64XXX_I2C_STATUS_MAST_RD_DATA_NO_ACK … #define MV64XXX_I2C_STATUS_MAST_WR_ADDR_2_ACK … #define MV64XXX_I2C_STATUS_MAST_WR_ADDR_2_NO_ACK … #define MV64XXX_I2C_STATUS_MAST_RD_ADDR_2_ACK … #define MV64XXX_I2C_STATUS_MAST_RD_ADDR_2_NO_ACK … #define MV64XXX_I2C_STATUS_NO_STATUS … /* Register defines (I2C bridge) */ #define MV64XXX_I2C_REG_TX_DATA_LO … #define MV64XXX_I2C_REG_TX_DATA_HI … #define MV64XXX_I2C_REG_RX_DATA_LO … #define MV64XXX_I2C_REG_RX_DATA_HI … #define MV64XXX_I2C_REG_BRIDGE_CONTROL … #define MV64XXX_I2C_REG_BRIDGE_STATUS … #define MV64XXX_I2C_REG_BRIDGE_INTR_CAUSE … #define MV64XXX_I2C_REG_BRIDGE_INTR_MASK … #define MV64XXX_I2C_REG_BRIDGE_TIMING … /* Bridge Control values */ #define MV64XXX_I2C_BRIDGE_CONTROL_WR … #define MV64XXX_I2C_BRIDGE_CONTROL_RD … #define MV64XXX_I2C_BRIDGE_CONTROL_ADDR_SHIFT … #define MV64XXX_I2C_BRIDGE_CONTROL_ADDR_EXT … #define MV64XXX_I2C_BRIDGE_CONTROL_TX_SIZE_SHIFT … #define MV64XXX_I2C_BRIDGE_CONTROL_RX_SIZE_SHIFT … #define MV64XXX_I2C_BRIDGE_CONTROL_ENABLE … #define MV64XXX_I2C_BRIDGE_CONTROL_REPEATED_START … /* Bridge Status values */ #define MV64XXX_I2C_BRIDGE_STATUS_ERROR … /* Driver states */ enum { … }; /* Driver actions */ enum { … }; struct mv64xxx_i2c_regs { … }; struct mv64xxx_i2c_data { … }; static struct mv64xxx_i2c_regs mv64xxx_i2c_regs_mv64xxx = …; static struct mv64xxx_i2c_regs mv64xxx_i2c_regs_sun4i = …; static void mv64xxx_i2c_prepare_for_io(struct mv64xxx_i2c_data *drv_data, struct i2c_msg *msg) { … } /* ***************************************************************************** * * Finite State Machine & Interrupt Routines * ***************************************************************************** */ /* Reset hardware and initialize FSM */ static void mv64xxx_i2c_hw_init(struct mv64xxx_i2c_data *drv_data) { … } static void mv64xxx_i2c_fsm(struct mv64xxx_i2c_data *drv_data, u32 status) { … } static void mv64xxx_i2c_send_start(struct mv64xxx_i2c_data *drv_data) { … } static void mv64xxx_i2c_do_action(struct mv64xxx_i2c_data *drv_data) { … } static void mv64xxx_i2c_read_offload_rx_data(struct mv64xxx_i2c_data *drv_data, struct i2c_msg *msg) { … } static int mv64xxx_i2c_intr_offload(struct mv64xxx_i2c_data *drv_data) { … } static irqreturn_t mv64xxx_i2c_intr(int irq, void *dev_id) { … } /* ***************************************************************************** * * I2C Msg Execution Routines * ***************************************************************************** */ static void mv64xxx_i2c_wait_for_completion(struct mv64xxx_i2c_data *drv_data) { … } static void mv64xxx_i2c_wait_polling(struct mv64xxx_i2c_data *drv_data) { … } static int mv64xxx_i2c_execute_msg(struct mv64xxx_i2c_data *drv_data, struct i2c_msg *msg, int is_last) { … } static void mv64xxx_i2c_prepare_tx(struct mv64xxx_i2c_data *drv_data) { … } static int mv64xxx_i2c_offload_xfer(struct mv64xxx_i2c_data *drv_data) { … } static bool mv64xxx_i2c_valid_offload_sz(struct i2c_msg *msg) { … } static bool mv64xxx_i2c_can_offload(struct mv64xxx_i2c_data *drv_data) { … } /* ***************************************************************************** * * I2C Core Support Routines (Interface to higher level I2C code) * ***************************************************************************** */ static u32 mv64xxx_i2c_functionality(struct i2c_adapter *adap) { … } static int mv64xxx_i2c_xfer_core(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) { … } static int mv64xxx_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) { … } static int mv64xxx_i2c_xfer_atomic(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) { … } static const struct i2c_algorithm mv64xxx_i2c_algo = …; /* ***************************************************************************** * * Driver Interface & Early Init Routines * ***************************************************************************** */ static const struct of_device_id mv64xxx_i2c_of_match_table[] = …; MODULE_DEVICE_TABLE(of, mv64xxx_i2c_of_match_table); #ifdef CONFIG_OF static int mv64xxx_calc_freq(struct mv64xxx_i2c_data *drv_data, const int tclk, const int n, const int m) { … } static bool mv64xxx_find_baud_factors(struct mv64xxx_i2c_data *drv_data, const u32 req_freq, const u32 tclk) { … } static int mv64xxx_of_config(struct mv64xxx_i2c_data *drv_data, struct device *dev) { … } #else /* CONFIG_OF */ static int mv64xxx_of_config(struct mv64xxx_i2c_data *drv_data, struct device *dev) { return -ENODEV; } #endif /* CONFIG_OF */ static int mv64xxx_i2c_init_recovery_info(struct mv64xxx_i2c_data *drv_data, struct device *dev) { … } static int mv64xxx_i2c_runtime_suspend(struct device *dev) { … } static int mv64xxx_i2c_runtime_resume(struct device *dev) { … } static int mv64xxx_i2c_probe(struct platform_device *pd) { … } static void mv64xxx_i2c_remove(struct platform_device *pd) { … } static const struct dev_pm_ops mv64xxx_i2c_pm_ops = …; static struct platform_driver mv64xxx_i2c_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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