// SPDX-License-Identifier: GPL-2.0 /* * SuperH Mobile I2C Controller * * Copyright (C) 2014-19 Wolfram Sang <[email protected]> * Copyright (C) 2008 Magnus Damm * * Portions of the code based on out-of-tree driver i2c-sh7343.c * Copyright (c) 2006 Carlos Munoz <[email protected]> */ #include <linux/clk.h> #include <linux/delay.h> #include <linux/dmaengine.h> #include <linux/dma-mapping.h> #include <linux/err.h> #include <linux/i2c.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/slab.h> /* Transmit operation: */ /* */ /* 0 byte transmit */ /* BUS: S A8 ACK P(*) */ /* IRQ: DTE WAIT */ /* ICIC: */ /* ICCR: 0x94 0x90 */ /* ICDR: A8 */ /* */ /* 1 byte transmit */ /* BUS: S A8 ACK D8(1) ACK P(*) */ /* IRQ: DTE WAIT WAIT */ /* ICIC: -DTE */ /* ICCR: 0x94 0x90 */ /* ICDR: A8 D8(1) */ /* */ /* 2 byte transmit */ /* BUS: S A8 ACK D8(1) ACK D8(2) ACK P(*) */ /* IRQ: DTE WAIT WAIT WAIT */ /* ICIC: -DTE */ /* ICCR: 0x94 0x90 */ /* ICDR: A8 D8(1) D8(2) */ /* */ /* 3 bytes or more, +---------+ gets repeated */ /* */ /* */ /* Receive operation: */ /* */ /* 0 byte receive - not supported since slave may hold SDA low */ /* */ /* 1 byte receive [TX] | [RX] */ /* BUS: S A8 ACK | D8(1) ACK P(*) */ /* IRQ: DTE WAIT | WAIT DTE */ /* ICIC: -DTE | +DTE */ /* ICCR: 0x94 0x81 | 0xc0 */ /* ICDR: A8 | D8(1) */ /* */ /* 2 byte receive [TX]| [RX] */ /* BUS: S A8 ACK | D8(1) ACK D8(2) ACK P(*) */ /* IRQ: DTE WAIT | WAIT WAIT DTE */ /* ICIC: -DTE | +DTE */ /* ICCR: 0x94 0x81 | 0xc0 */ /* ICDR: A8 | D8(1) D8(2) */ /* */ /* 3 byte receive [TX] | [RX] (*) */ /* BUS: S A8 ACK | D8(1) ACK D8(2) ACK D8(3) ACK P */ /* IRQ: DTE WAIT | WAIT WAIT WAIT DTE */ /* ICIC: -DTE | +DTE */ /* ICCR: 0x94 0x81 | 0xc0 */ /* ICDR: A8 | D8(1) D8(2) D8(3) */ /* */ /* 4 bytes or more, this part is repeated +---------+ */ /* */ /* */ /* Interrupt order and BUSY flag */ /* ___ _ */ /* SDA ___\___XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXAAAAAAAAA___/ */ /* SCL \_/1\_/2\_/3\_/4\_/5\_/6\_/7\_/8\___/9\_____/ */ /* */ /* S D7 D6 D5 D4 D3 D2 D1 D0 P(*) */ /* ___ */ /* WAIT IRQ ________________________________/ \___________ */ /* TACK IRQ ____________________________________/ \_______ */ /* DTE IRQ __________________________________________/ \_ */ /* AL IRQ XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */ /* _______________________________________________ */ /* BUSY __/ \_ */ /* */ /* (*) The STOP condition is only sent by the master at the end of the last */ /* I2C message or if the I2C_M_STOP flag is set. Similarly, the BUSY bit is */ /* only cleared after the STOP condition, so, between messages we have to */ /* poll for the DTE bit. */ /* */ enum sh_mobile_i2c_op { … }; struct sh_mobile_i2c_data { … }; struct sh_mobile_dt_config { … }; #define IIC_FLAG_HAS_ICIC67 … /* Register offsets */ #define ICDR … #define ICCR … #define ICSR … #define ICIC … #define ICCL … #define ICCH … #define ICSTART … /* Register bits */ #define ICCR_ICE … #define ICCR_RACK … #define ICCR_TRS … #define ICCR_BBSY … #define ICCR_SCP … #define ICSR_SCLM … #define ICSR_SDAM … #define SW_DONE … #define ICSR_BUSY … #define ICSR_AL … #define ICSR_TACK … #define ICSR_WAIT … #define ICSR_DTE … #define ICIC_ICCLB8 … #define ICIC_ICCHB8 … #define ICIC_TDMAE … #define ICIC_RDMAE … #define ICIC_ALE … #define ICIC_TACKE … #define ICIC_WAITE … #define ICIC_DTEE … #define ICSTART_ICSTART … static void iic_wr(struct sh_mobile_i2c_data *pd, int offs, unsigned char data) { … } static unsigned char iic_rd(struct sh_mobile_i2c_data *pd, int offs) { … } static void iic_set_clr(struct sh_mobile_i2c_data *pd, int offs, unsigned char set, unsigned char clr) { … } static u32 sh_mobile_i2c_iccl(unsigned long count_khz, u32 tLOW, u32 tf) { … } static u32 sh_mobile_i2c_icch(unsigned long count_khz, u32 tHIGH, u32 tf) { … } static int sh_mobile_i2c_check_timing(struct sh_mobile_i2c_data *pd) { … } static int sh_mobile_i2c_init(struct sh_mobile_i2c_data *pd) { … } static int sh_mobile_i2c_v2_init(struct sh_mobile_i2c_data *pd) { … } static unsigned char i2c_op(struct sh_mobile_i2c_data *pd, enum sh_mobile_i2c_op op) { … } static int sh_mobile_i2c_isr_tx(struct sh_mobile_i2c_data *pd) { … } static int sh_mobile_i2c_isr_rx(struct sh_mobile_i2c_data *pd) { … } static irqreturn_t sh_mobile_i2c_isr(int irq, void *dev_id) { … } static void sh_mobile_i2c_cleanup_dma(struct sh_mobile_i2c_data *pd, bool terminate) { … } static void sh_mobile_i2c_dma_callback(void *data) { … } static struct dma_chan *sh_mobile_i2c_request_dma_chan(struct device *dev, enum dma_transfer_direction dir, dma_addr_t port_addr) { … } static void sh_mobile_i2c_xfer_dma(struct sh_mobile_i2c_data *pd) { … } static void start_ch(struct sh_mobile_i2c_data *pd, struct i2c_msg *usr_msg, bool do_init) { … } static int poll_dte(struct sh_mobile_i2c_data *pd) { … } static int poll_busy(struct sh_mobile_i2c_data *pd) { … } static int sh_mobile_xfer(struct sh_mobile_i2c_data *pd, struct i2c_msg *msgs, int num) { … } static int sh_mobile_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num) { … } static int sh_mobile_i2c_xfer_atomic(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num) { … } static u32 sh_mobile_i2c_func(struct i2c_adapter *adapter) { … } static const struct i2c_algorithm sh_mobile_i2c_algorithm = …; static const struct i2c_adapter_quirks sh_mobile_i2c_quirks = …; /* * r8a7740 has an errata regarding I2C I/O pad reset needing this workaround. */ static int sh_mobile_i2c_r8a7740_workaround(struct sh_mobile_i2c_data *pd) { … } static const struct sh_mobile_dt_config default_dt_config = …; static const struct sh_mobile_dt_config fast_clock_dt_config = …; static const struct sh_mobile_dt_config r8a7740_dt_config = …; static const struct of_device_id sh_mobile_i2c_dt_ids[] = …; MODULE_DEVICE_TABLE(of, sh_mobile_i2c_dt_ids); static void sh_mobile_i2c_release_dma(struct sh_mobile_i2c_data *pd) { … } static int sh_mobile_i2c_hook_irqs(struct platform_device *dev, struct sh_mobile_i2c_data *pd) { … } static int sh_mobile_i2c_probe(struct platform_device *dev) { … } static void sh_mobile_i2c_remove(struct platform_device *dev) { … } static int sh_mobile_i2c_suspend(struct device *dev) { … } static int sh_mobile_i2c_resume(struct device *dev) { … } static const struct dev_pm_ops sh_mobile_i2c_pm_ops = …; static struct platform_driver sh_mobile_i2c_driver = …; static int __init sh_mobile_i2c_adap_init(void) { … } subsys_initcall(sh_mobile_i2c_adap_init); static void __exit sh_mobile_i2c_adap_exit(void) { … } module_exit(sh_mobile_i2c_adap_exit); MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …; MODULE_ALIAS(…) …;
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