drivers/i2c/busses/i2c-stm32f7.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Driver for STMicroelectronics STM32F7 I2C controller
   4  *
   5  * This I2C controller is described in the STM32F75xxx and STM32F74xxx Soc
   6  * reference manual.
   7  * Please see below a link to the documentation:
   8  * http://www.st.com/resource/en/reference_manual/dm00124865.pdf
   9  *
  10  * Copyright (C) M'boumba Cedric Madianga 2017
  11  * Copyright (C) STMicroelectronics 2017
  12  * Author: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
  13  *
  14  * This driver is based on i2c-stm32f4.c
  15  *
  16  */
  17 #include <linux/clk.h>
  18 #include <linux/delay.h>
  19 #include <linux/err.h>
  20 #include <linux/i2c.h>
  21 #include <linux/i2c-smbus.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/io.h>
  24 #include <linux/iopoll.h>
  25 #include <linux/mfd/syscon.h>
  26 #include <linux/module.h>
  27 #include <linux/of.h>
  28 #include <linux/of_address.h>
  29 #include <linux/of_platform.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/pinctrl/consumer.h>
  32 #include <linux/pm_runtime.h>
  33 #include <linux/pm_wakeirq.h>
  34 #include <linux/regmap.h>
  35 #include <linux/reset.h>
  36 #include <linux/slab.h>
  37
  38 #include "i2c-stm32.h"
  39
  40 /* STM32F7 I2C registers */
  41 #define STM32F7_I2C_CR1                         0x00
  42 #define STM32F7_I2C_CR2                         0x04
  43 #define STM32F7_I2C_OAR1                        0x08
  44 #define STM32F7_I2C_OAR2                        0x0C
  45 #define STM32F7_I2C_PECR                        0x20
  46 #define STM32F7_I2C_TIMINGR                     0x10
  47 #define STM32F7_I2C_ISR                         0x18
  48 #define STM32F7_I2C_ICR                         0x1C
  49 #define STM32F7_I2C_RXDR                        0x24
  50 #define STM32F7_I2C_TXDR                        0x28
  51
  52 /* STM32F7 I2C control 1 */
  53 #define STM32F7_I2C_CR1_PECEN                   BIT(23)
  54 #define STM32F7_I2C_CR1_SMBHEN                  BIT(20)
  55 #define STM32F7_I2C_CR1_WUPEN                   BIT(18)
  56 #define STM32F7_I2C_CR1_SBC                     BIT(16)
  57 #define STM32F7_I2C_CR1_RXDMAEN                 BIT(15)
  58 #define STM32F7_I2C_CR1_TXDMAEN                 BIT(14)
  59 #define STM32F7_I2C_CR1_ANFOFF                  BIT(12)
  60 #define STM32F7_I2C_CR1_DNF_MASK                GENMASK(11, 8)
  61 #define STM32F7_I2C_CR1_DNF(n)                  (((n) & 0xf) << 8)
  62 #define STM32F7_I2C_CR1_ERRIE                   BIT(7)
  63 #define STM32F7_I2C_CR1_TCIE                    BIT(6)
  64 #define STM32F7_I2C_CR1_STOPIE                  BIT(5)
  65 #define STM32F7_I2C_CR1_NACKIE                  BIT(4)
  66 #define STM32F7_I2C_CR1_ADDRIE                  BIT(3)
  67 #define STM32F7_I2C_CR1_RXIE                    BIT(2)
  68 #define STM32F7_I2C_CR1_TXIE                    BIT(1)
  69 #define STM32F7_I2C_CR1_PE                      BIT(0)
  70 #define STM32F7_I2C_ALL_IRQ_MASK                (STM32F7_I2C_CR1_ERRIE \
  71                                                 | STM32F7_I2C_CR1_TCIE \
  72                                                 | STM32F7_I2C_CR1_STOPIE \
  73                                                 | STM32F7_I2C_CR1_NACKIE \
  74                                                 | STM32F7_I2C_CR1_RXIE \
  75                                                 | STM32F7_I2C_CR1_TXIE)
  76 #define STM32F7_I2C_XFER_IRQ_MASK               (STM32F7_I2C_CR1_TCIE \
  77                                                 | STM32F7_I2C_CR1_STOPIE \
  78                                                 | STM32F7_I2C_CR1_NACKIE \
  79                                                 | STM32F7_I2C_CR1_RXIE \
  80                                                 | STM32F7_I2C_CR1_TXIE)
  81
  82 /* STM32F7 I2C control 2 */
  83 #define STM32F7_I2C_CR2_PECBYTE                 BIT(26)
  84 #define STM32F7_I2C_CR2_RELOAD                  BIT(24)
  85 #define STM32F7_I2C_CR2_NBYTES_MASK             GENMASK(23, 16)
  86 #define STM32F7_I2C_CR2_NBYTES(n)               (((n) & 0xff) << 16)
  87 #define STM32F7_I2C_CR2_NACK                    BIT(15)
  88 #define STM32F7_I2C_CR2_STOP                    BIT(14)
  89 #define STM32F7_I2C_CR2_START                   BIT(13)
  90 #define STM32F7_I2C_CR2_HEAD10R                 BIT(12)
  91 #define STM32F7_I2C_CR2_ADD10                   BIT(11)
  92 #define STM32F7_I2C_CR2_RD_WRN                  BIT(10)
  93 #define STM32F7_I2C_CR2_SADD10_MASK             GENMASK(9, 0)
  94 #define STM32F7_I2C_CR2_SADD10(n)               (((n) & \
  95                                                 STM32F7_I2C_CR2_SADD10_MASK))
  96 #define STM32F7_I2C_CR2_SADD7_MASK              GENMASK(7, 1)
  97 #define STM32F7_I2C_CR2_SADD7(n)                (((n) & 0x7f) << 1)
  98
  99 /* STM32F7 I2C Own Address 1 */
 100 #define STM32F7_I2C_OAR1_OA1EN                  BIT(15)
 101 #define STM32F7_I2C_OAR1_OA1MODE                BIT(10)
 102 #define STM32F7_I2C_OAR1_OA1_10_MASK            GENMASK(9, 0)
 103 #define STM32F7_I2C_OAR1_OA1_10(n)              (((n) & \
 104                                                 STM32F7_I2C_OAR1_OA1_10_MASK))
 105 #define STM32F7_I2C_OAR1_OA1_7_MASK             GENMASK(7, 1)
 106 #define STM32F7_I2C_OAR1_OA1_7(n)               (((n) & 0x7f) << 1)
 107 #define STM32F7_I2C_OAR1_MASK                   (STM32F7_I2C_OAR1_OA1_7_MASK \
 108                                                 | STM32F7_I2C_OAR1_OA1_10_MASK \
 109                                                 | STM32F7_I2C_OAR1_OA1EN \
 110                                                 | STM32F7_I2C_OAR1_OA1MODE)
 111
 112 /* STM32F7 I2C Own Address 2 */
 113 #define STM32F7_I2C_OAR2_OA2EN                  BIT(15)
 114 #define STM32F7_I2C_OAR2_OA2MSK_MASK            GENMASK(10, 8)
 115 #define STM32F7_I2C_OAR2_OA2MSK(n)              (((n) & 0x7) << 8)
 116 #define STM32F7_I2C_OAR2_OA2_7_MASK             GENMASK(7, 1)
 117 #define STM32F7_I2C_OAR2_OA2_7(n)               (((n) & 0x7f) << 1)
 118 #define STM32F7_I2C_OAR2_MASK                   (STM32F7_I2C_OAR2_OA2MSK_MASK \
 119                                                 | STM32F7_I2C_OAR2_OA2_7_MASK \
 120                                                 | STM32F7_I2C_OAR2_OA2EN)
 121
 122 /* STM32F7 I2C Interrupt Status */
 123 #define STM32F7_I2C_ISR_ADDCODE_MASK            GENMASK(23, 17)
 124 #define STM32F7_I2C_ISR_ADDCODE_GET(n) \
 125                                 (((n) & STM32F7_I2C_ISR_ADDCODE_MASK) >> 17)
 126 #define STM32F7_I2C_ISR_DIR                     BIT(16)
 127 #define STM32F7_I2C_ISR_BUSY                    BIT(15)
 128 #define STM32F7_I2C_ISR_PECERR                  BIT(11)
 129 #define STM32F7_I2C_ISR_ARLO                    BIT(9)
 130 #define STM32F7_I2C_ISR_BERR                    BIT(8)
 131 #define STM32F7_I2C_ISR_TCR                     BIT(7)
 132 #define STM32F7_I2C_ISR_TC                      BIT(6)
 133 #define STM32F7_I2C_ISR_STOPF                   BIT(5)
 134 #define STM32F7_I2C_ISR_NACKF                   BIT(4)
 135 #define STM32F7_I2C_ISR_ADDR                    BIT(3)
 136 #define STM32F7_I2C_ISR_RXNE                    BIT(2)
 137 #define STM32F7_I2C_ISR_TXIS                    BIT(1)
 138 #define STM32F7_I2C_ISR_TXE                     BIT(0)
 139
 140 /* STM32F7 I2C Interrupt Clear */
 141 #define STM32F7_I2C_ICR_PECCF                   BIT(11)
 142 #define STM32F7_I2C_ICR_ARLOCF                  BIT(9)
 143 #define STM32F7_I2C_ICR_BERRCF                  BIT(8)
 144 #define STM32F7_I2C_ICR_STOPCF                  BIT(5)
 145 #define STM32F7_I2C_ICR_NACKCF                  BIT(4)
 146 #define STM32F7_I2C_ICR_ADDRCF                  BIT(3)
 147
 148 /* STM32F7 I2C Timing */
 149 #define STM32F7_I2C_TIMINGR_PRESC(n)            (((n) & 0xf) << 28)
 150 #define STM32F7_I2C_TIMINGR_SCLDEL(n)           (((n) & 0xf) << 20)
 151 #define STM32F7_I2C_TIMINGR_SDADEL(n)           (((n) & 0xf) << 16)
 152 #define STM32F7_I2C_TIMINGR_SCLH(n)             (((n) & 0xff) << 8)
 153 #define STM32F7_I2C_TIMINGR_SCLL(n)             ((n) & 0xff)
 154
 155 #define STM32F7_I2C_MAX_LEN                     0xff
 156 #define STM32F7_I2C_DMA_LEN_MIN                 0x16
 157 enum {
 158         STM32F7_SLAVE_HOSTNOTIFY,
 159         STM32F7_SLAVE_7_10_BITS_ADDR,
 160         STM32F7_SLAVE_7_BITS_ADDR,
 161         STM32F7_I2C_MAX_SLAVE
 162 };
 163
 164 #define STM32F7_I2C_DNF_DEFAULT                 0
 165 #define STM32F7_I2C_DNF_MAX                     15
 166
 167 #define STM32F7_I2C_ANALOG_FILTER_ENABLE        1
 168 #define STM32F7_I2C_ANALOG_FILTER_DELAY_MIN     50      /* ns */
 169 #define STM32F7_I2C_ANALOG_FILTER_DELAY_MAX     260     /* ns */
 170
 171 #define STM32F7_I2C_RISE_TIME_DEFAULT           25      /* ns */
 172 #define STM32F7_I2C_FALL_TIME_DEFAULT           10      /* ns */
 173
 174 #define STM32F7_PRESC_MAX                       BIT(4)
 175 #define STM32F7_SCLDEL_MAX                      BIT(4)
 176 #define STM32F7_SDADEL_MAX                      BIT(4)
 177 #define STM32F7_SCLH_MAX                        BIT(8)
 178 #define STM32F7_SCLL_MAX                        BIT(8)
 179
 180 #define STM32F7_AUTOSUSPEND_DELAY               (HZ / 100)
 181
 182 /**
 183  * struct stm32f7_i2c_regs - i2c f7 registers backup
 184  * @cr1: Control register 1
 185  * @cr2: Control register 2
 186  * @oar1: Own address 1 register
 187  * @oar2: Own address 2 register
 188  * @tmgr: Timing register
 189  */
 190 struct stm32f7_i2c_regs {
 191         u32 cr1;
 192         u32 cr2;
 193         u32 oar1;
 194         u32 oar2;
 195         u32 tmgr;
 196 };
 197
 198 /**
 199  * struct stm32f7_i2c_spec - private i2c specification timing
 200  * @rate: I2C bus speed (Hz)
 201  * @fall_max: Max fall time of both SDA and SCL signals (ns)
 202  * @rise_max: Max rise time of both SDA and SCL signals (ns)
 203  * @hddat_min: Min data hold time (ns)
 204  * @vddat_max: Max data valid time (ns)
 205  * @sudat_min: Min data setup time (ns)
 206  * @l_min: Min low period of the SCL clock (ns)
 207  * @h_min: Min high period of the SCL clock (ns)
 208  */
 209 struct stm32f7_i2c_spec {
 210         u32 rate;
 211         u32 fall_max;
 212         u32 rise_max;
 213         u32 hddat_min;
 214         u32 vddat_max;
 215         u32 sudat_min;
 216         u32 l_min;
 217         u32 h_min;
 218 };
 219
 220 /**
 221  * struct stm32f7_i2c_setup - private I2C timing setup parameters
 222  * @speed_freq: I2C speed frequency  (Hz)
 223  * @clock_src: I2C clock source frequency (Hz)
 224  * @rise_time: Rise time (ns)
 225  * @fall_time: Fall time (ns)
 226  * @dnf: Digital filter coefficient (0-16)
 227  * @analog_filter: Analog filter delay (On/Off)
 228  * @fmp_clr_offset: Fast Mode Plus clear register offset from set register
 229  */
 230 struct stm32f7_i2c_setup {
 231         u32 speed_freq;
 232         u32 clock_src;
 233         u32 rise_time;
 234         u32 fall_time;
 235         u8 dnf;
 236         bool analog_filter;
 237         u32 fmp_clr_offset;
 238 };
 239
 240 /**
 241  * struct stm32f7_i2c_timings - private I2C output parameters
 242  * @node: List entry
 243  * @presc: Prescaler value
 244  * @scldel: Data setup time
 245  * @sdadel: Data hold time
 246  * @sclh: SCL high period (master mode)
 247  * @scll: SCL low period (master mode)
 248  */
 249 struct stm32f7_i2c_timings {
 250         struct list_head node;
 251         u8 presc;
 252         u8 scldel;
 253         u8 sdadel;
 254         u8 sclh;
 255         u8 scll;
 256 };
 257
 258 /**
 259  * struct stm32f7_i2c_msg - client specific data
 260  * @addr: 8-bit or 10-bit slave addr, including r/w bit
 261  * @count: number of bytes to be transferred
 262  * @buf: data buffer
 263  * @result: result of the transfer
 264  * @stop: last I2C msg to be sent, i.e. STOP to be generated
 265  * @smbus: boolean to know if the I2C IP is used in SMBus mode
 266  * @size: type of SMBus protocol
 267  * @read_write: direction of SMBus protocol
 268  * SMBus block read and SMBus block write - block read process call protocols
 269  * @smbus_buf: buffer to be used for SMBus protocol transfer. It will
 270  * contain a maximum of 32 bytes of data + byte command + byte count + PEC
 271  * This buffer has to be 32-bit aligned to be compliant with memory address
 272  * register in DMA mode.
 273  */
 274 struct stm32f7_i2c_msg {
 275         u16 addr;
 276         u32 count;
 277         u8 *buf;
 278         int result;
 279         bool stop;
 280         bool smbus;
 281         int size;
 282         char read_write;
 283         u8 smbus_buf[I2C_SMBUS_BLOCK_MAX + 3] __aligned(4);
 284 };
 285
 286 /**
 287  * struct stm32f7_i2c_dev - private data of the controller
 288  * @adap: I2C adapter for this controller
 289  * @dev: device for this controller
 290  * @base: virtual memory area
 291  * @complete: completion of I2C message
 292  * @clk: hw i2c clock
 293  * @bus_rate: I2C clock frequency of the controller
 294  * @msg: Pointer to data to be written
 295  * @msg_num: number of I2C messages to be executed
 296  * @msg_id: message identifiant
 297  * @f7_msg: customized i2c msg for driver usage
 298  * @setup: I2C timing input setup
 299  * @timing: I2C computed timings
 300  * @slave: list of slave devices registered on the I2C bus
 301  * @slave_running: slave device currently used
 302  * @backup_regs: backup of i2c controller registers (for suspend/resume)
 303  * @slave_dir: transfer direction for the current slave device
 304  * @master_mode: boolean to know in which mode the I2C is running (master or
 305  * slave)
 306  * @dma: dma data
 307  * @use_dma: boolean to know if dma is used in the current transfer
 308  * @regmap: holds SYSCFG phandle for Fast Mode Plus bits
 309  * @fmp_sreg: register address for setting Fast Mode Plus bits
 310  * @fmp_creg: register address for clearing Fast Mode Plus bits
 311  * @fmp_mask: mask for Fast Mode Plus bits in set register
 312  * @wakeup_src: boolean to know if the device is a wakeup source
 313  * @smbus_mode: states that the controller is configured in SMBus mode
 314  * @host_notify_client: SMBus host-notify client
 315  */
 316 struct stm32f7_i2c_dev {
 317         struct i2c_adapter adap;
 318         struct device *dev;
 319         void __iomem *base;
 320         struct completion complete;
 321         struct clk *clk;
 322         unsigned int bus_rate;
 323         struct i2c_msg *msg;
 324         unsigned int msg_num;
 325         unsigned int msg_id;
 326         struct stm32f7_i2c_msg f7_msg;
 327         struct stm32f7_i2c_setup setup;
 328         struct stm32f7_i2c_timings timing;
 329         struct i2c_client *slave[STM32F7_I2C_MAX_SLAVE];
 330         struct i2c_client *slave_running;
 331         struct stm32f7_i2c_regs backup_regs;
 332         u32 slave_dir;
 333         bool master_mode;
 334         struct stm32_i2c_dma *dma;
 335         bool use_dma;
 336         struct regmap *regmap;
 337         u32 fmp_sreg;
 338         u32 fmp_creg;
 339         u32 fmp_mask;
 340         bool wakeup_src;
 341         bool smbus_mode;
 342         struct i2c_client *host_notify_client;
 343 };
 344
 345 /*
 346  * All these values are coming from I2C Specification, Version 6.0, 4th of
 347  * April 2014.
 348  *
 349  * Table10. Characteristics of the SDA and SCL bus lines for Standard, Fast,
 350  * and Fast-mode Plus I2C-bus devices
 351  */
 352 static struct stm32f7_i2c_spec stm32f7_i2c_specs[] = {
 353         {
 354                 .rate = I2C_MAX_STANDARD_MODE_FREQ,
 355                 .fall_max = 300,
 356                 .rise_max = 1000,
 357                 .hddat_min = 0,
 358                 .vddat_max = 3450,
 359                 .sudat_min = 250,
 360                 .l_min = 4700,
 361                 .h_min = 4000,
 362         },
 363         {
 364                 .rate = I2C_MAX_FAST_MODE_FREQ,
 365                 .fall_max = 300,
 366                 .rise_max = 300,
 367                 .hddat_min = 0,
 368                 .vddat_max = 900,
 369                 .sudat_min = 100,
 370                 .l_min = 1300,
 371                 .h_min = 600,
 372         },
 373         {
 374                 .rate = I2C_MAX_FAST_MODE_PLUS_FREQ,
 375                 .fall_max = 100,
 376                 .rise_max = 120,
 377                 .hddat_min = 0,
 378                 .vddat_max = 450,
 379                 .sudat_min = 50,
 380                 .l_min = 500,
 381                 .h_min = 260,
 382         },
 383 };
 384
 385 static const struct stm32f7_i2c_setup stm32f7_setup = {
 386         .rise_time = STM32F7_I2C_RISE_TIME_DEFAULT,
 387         .fall_time = STM32F7_I2C_FALL_TIME_DEFAULT,
 388         .dnf = STM32F7_I2C_DNF_DEFAULT,
 389         .analog_filter = STM32F7_I2C_ANALOG_FILTER_ENABLE,
 390 };
 391
 392 static const struct stm32f7_i2c_setup stm32mp15_setup = {
 393         .rise_time = STM32F7_I2C_RISE_TIME_DEFAULT,
 394         .fall_time = STM32F7_I2C_FALL_TIME_DEFAULT,
 395         .dnf = STM32F7_I2C_DNF_DEFAULT,
 396         .analog_filter = STM32F7_I2C_ANALOG_FILTER_ENABLE,
 397         .fmp_clr_offset = 0x40,
 398 };
 399
 400 static inline void stm32f7_i2c_set_bits(void __iomem *reg, u32 mask)
 401 {
 402         writel_relaxed(readl_relaxed(reg) | mask, reg);
 403 }
 404
 405 static inline void stm32f7_i2c_clr_bits(void __iomem *reg, u32 mask)
 406 {
 407         writel_relaxed(readl_relaxed(reg) & ~mask, reg);
 408 }
 409
 410 static void stm32f7_i2c_disable_irq(struct stm32f7_i2c_dev *i2c_dev, u32 mask)
 411 {
 412         stm32f7_i2c_clr_bits(i2c_dev->base + STM32F7_I2C_CR1, mask);
 413 }
 414
 415 static struct stm32f7_i2c_spec *stm32f7_get_specs(u32 rate)
 416 {
 417         int i;
 418
 419         for (i = 0; i < ARRAY_SIZE(stm32f7_i2c_specs); i++)
 420                 if (rate <= stm32f7_i2c_specs[i].rate)
 421                         return &stm32f7_i2c_specs[i];
 422
 423         return ERR_PTR(-EINVAL);
 424 }
 425
 426 #define RATE_MIN(rate)  ((rate) * 8 / 10)
 427 static int stm32f7_i2c_compute_timing(struct stm32f7_i2c_dev *i2c_dev,
 428                                       struct stm32f7_i2c_setup *setup,
 429                                       struct stm32f7_i2c_timings *output)
 430 {
 431         struct stm32f7_i2c_spec *specs;
 432         u32 p_prev = STM32F7_PRESC_MAX;
 433         u32 i2cclk = DIV_ROUND_CLOSEST(NSEC_PER_SEC,
 434                                        setup->clock_src);
 435         u32 i2cbus = DIV_ROUND_CLOSEST(NSEC_PER_SEC,
 436                                        setup->speed_freq);
 437         u32 clk_error_prev = i2cbus;
 438         u32 tsync;
 439         u32 af_delay_min, af_delay_max;
 440         u32 dnf_delay;
 441         u32 clk_min, clk_max;
 442         int sdadel_min, sdadel_max;
 443         int scldel_min;
 444         struct stm32f7_i2c_timings *v, *_v, *s;
 445         struct list_head solutions;
 446         u16 p, l, a, h;
 447         int ret = 0;
 448
 449         specs = stm32f7_get_specs(setup->speed_freq);
 450         if (specs == ERR_PTR(-EINVAL)) {
 451                 dev_err(i2c_dev->dev, "speed out of bound {%d}\n",
 452                         setup->speed_freq);
 453                 return -EINVAL;
 454         }
 455
 456         if ((setup->rise_time > specs->rise_max) ||
 457             (setup->fall_time > specs->fall_max)) {
 458                 dev_err(i2c_dev->dev,
 459                         "timings out of bound Rise{%d>%d}/Fall{%d>%d}\n",
 460                         setup->rise_time, specs->rise_max,
 461                         setup->fall_time, specs->fall_max);
 462                 return -EINVAL;
 463         }
 464
 465         if (setup->dnf > STM32F7_I2C_DNF_MAX) {
 466                 dev_err(i2c_dev->dev,
 467                         "DNF out of bound %d/%d\n",
 468                         setup->dnf, STM32F7_I2C_DNF_MAX);
 469                 return -EINVAL;
 470         }
 471
 472         /*  Analog and Digital Filters */
 473         af_delay_min =
 474                 (setup->analog_filter ?
 475                  STM32F7_I2C_ANALOG_FILTER_DELAY_MIN : 0);
 476         af_delay_max =
 477                 (setup->analog_filter ?
 478                  STM32F7_I2C_ANALOG_FILTER_DELAY_MAX : 0);
 479         dnf_delay = setup->dnf * i2cclk;
 480
 481         sdadel_min = specs->hddat_min + setup->fall_time -
 482                 af_delay_min - (setup->dnf + 3) * i2cclk;
 483
 484         sdadel_max = specs->vddat_max - setup->rise_time -
 485                 af_delay_max - (setup->dnf + 4) * i2cclk;
 486
 487         scldel_min = setup->rise_time + specs->sudat_min;
 488
 489         if (sdadel_min < 0)
 490                 sdadel_min = 0;
 491         if (sdadel_max < 0)
 492                 sdadel_max = 0;
 493
 494         dev_dbg(i2c_dev->dev, "SDADEL(min/max): %i/%i, SCLDEL(Min): %i\n",
 495                 sdadel_min, sdadel_max, scldel_min);
 496
 497         INIT_LIST_HEAD(&solutions);
 498         /* Compute possible values for PRESC, SCLDEL and SDADEL */
 499         for (p = 0; p < STM32F7_PRESC_MAX; p++) {
 500                 for (l = 0; l < STM32F7_SCLDEL_MAX; l++) {
 501                         u32 scldel = (l + 1) * (p + 1) * i2cclk;
 502
 503                         if (scldel < scldel_min)
 504                                 continue;
 505
 506                         for (a = 0; a < STM32F7_SDADEL_MAX; a++) {
 507                                 u32 sdadel = (a * (p + 1) + 1) * i2cclk;
 508
 509                                 if (((sdadel >= sdadel_min) &&
 510                                      (sdadel <= sdadel_max)) &&
 511                                     (p != p_prev)) {
 512                                         v = kmalloc(sizeof(*v), GFP_KERNEL);
 513                                         if (!v) {
 514                                                 ret = -ENOMEM;
 515                                                 goto exit;
 516                                         }
 517
 518                                         v->presc = p;
 519                                         v->scldel = l;
 520                                         v->sdadel = a;
 521                                         p_prev = p;
 522
 523                                         list_add_tail(&v->node,
 524                                                       &solutions);
 525                                         break;
 526                                 }
 527                         }
 528
 529                         if (p_prev == p)
 530                                 break;
 531                 }
 532         }
 533
 534         if (list_empty(&solutions)) {
 535                 dev_err(i2c_dev->dev, "no Prescaler solution\n");
 536                 ret = -EPERM;
 537                 goto exit;
 538         }
 539
 540         tsync = af_delay_min + dnf_delay + (2 * i2cclk);
 541         s = NULL;
 542         clk_max = NSEC_PER_SEC / RATE_MIN(setup->speed_freq);
 543         clk_min = NSEC_PER_SEC / setup->speed_freq;
 544
 545         /*
 546          * Among Prescaler possibilities discovered above figures out SCL Low
 547          * and High Period. Provided:
 548          * - SCL Low Period has to be higher than SCL Clock Low Period
 549          *   defined by I2C Specification. I2C Clock has to be lower than
 550          *   (SCL Low Period - Analog/Digital filters) / 4.
 551          * - SCL High Period has to be lower than SCL Clock High Period
 552          *   defined by I2C Specification
 553          * - I2C Clock has to be lower than SCL High Period
 554          */
 555         list_for_each_entry(v, &solutions, node) {
 556                 u32 prescaler = (v->presc + 1) * i2cclk;
 557
 558                 for (l = 0; l < STM32F7_SCLL_MAX; l++) {
 559                         u32 tscl_l = (l + 1) * prescaler + tsync;
 560
 561                         if ((tscl_l < specs->l_min) ||
 562                             (i2cclk >=
 563                              ((tscl_l - af_delay_min - dnf_delay) / 4))) {
 564                                 continue;
 565                         }
 566
 567                         for (h = 0; h < STM32F7_SCLH_MAX; h++) {
 568                                 u32 tscl_h = (h + 1) * prescaler + tsync;
 569                                 u32 tscl = tscl_l + tscl_h +
 570                                         setup->rise_time + setup->fall_time;
 571
 572                                 if ((tscl >= clk_min) && (tscl <= clk_max) &&
 573                                     (tscl_h >= specs->h_min) &&
 574                                     (i2cclk < tscl_h)) {
 575                                         int clk_error = tscl - i2cbus;
 576
 577                                         if (clk_error < 0)
 578                                                 clk_error = -clk_error;
 579
 580                                         if (clk_error < clk_error_prev) {
 581                                                 clk_error_prev = clk_error;
 582                                                 v->scll = l;
 583                                                 v->sclh = h;
 584                                                 s = v;
 585                                         }
 586                                 }
 587                         }
 588                 }
 589         }
 590
 591         if (!s) {
 592                 dev_err(i2c_dev->dev, "no solution at all\n");
 593                 ret = -EPERM;
 594                 goto exit;
 595         }
 596
 597         output->presc = s->presc;
 598         output->scldel = s->scldel;
 599         output->sdadel = s->sdadel;
 600         output->scll = s->scll;
 601         output->sclh = s->sclh;
 602
 603         dev_dbg(i2c_dev->dev,
 604                 "Presc: %i, scldel: %i, sdadel: %i, scll: %i, sclh: %i\n",
 605                 output->presc,
 606                 output->scldel, output->sdadel,
 607                 output->scll, output->sclh);
 608
 609 exit:
 610         /* Release list and memory */
 611         list_for_each_entry_safe(v, _v, &solutions, node) {
 612                 list_del(&v->node);
 613                 kfree(v);
 614         }
 615
 616         return ret;
 617 }
 618
 619 static u32 stm32f7_get_lower_rate(u32 rate)
 620 {
 621         int i = ARRAY_SIZE(stm32f7_i2c_specs);
 622
 623         while (--i)
 624                 if (stm32f7_i2c_specs[i].rate < rate)
 625                         break;
 626
 627         return stm32f7_i2c_specs[i].rate;
 628 }
 629
 630 static int stm32f7_i2c_setup_timing(struct stm32f7_i2c_dev *i2c_dev,
 631                                     struct stm32f7_i2c_setup *setup)
 632 {
 633         struct i2c_timings timings, *t = &timings;
 634         int ret = 0;
 635
 636         t->bus_freq_hz = I2C_MAX_STANDARD_MODE_FREQ;
 637         t->scl_rise_ns = i2c_dev->setup.rise_time;
 638         t->scl_fall_ns = i2c_dev->setup.fall_time;
 639
 640         i2c_parse_fw_timings(i2c_dev->dev, t, false);
 641
 642         if (t->bus_freq_hz > I2C_MAX_FAST_MODE_PLUS_FREQ) {
 643                 dev_err(i2c_dev->dev, "Invalid bus speed (%i>%i)\n",
 644                         t->bus_freq_hz, I2C_MAX_FAST_MODE_PLUS_FREQ);
 645                 return -EINVAL;
 646         }
 647
 648         setup->speed_freq = t->bus_freq_hz;
 649         i2c_dev->setup.rise_time = t->scl_rise_ns;
 650         i2c_dev->setup.fall_time = t->scl_fall_ns;
 651         setup->clock_src = clk_get_rate(i2c_dev->clk);
 652
 653         if (!setup->clock_src) {
 654                 dev_err(i2c_dev->dev, "clock rate is 0\n");
 655                 return -EINVAL;
 656         }
 657
 658         do {
 659                 ret = stm32f7_i2c_compute_timing(i2c_dev, setup,
 660                                                  &i2c_dev->timing);
 661                 if (ret) {
 662                         dev_err(i2c_dev->dev,
 663                                 "failed to compute I2C timings.\n");
 664                         if (setup->speed_freq <= I2C_MAX_STANDARD_MODE_FREQ)
 665                                 break;
 666                         setup->speed_freq =
 667                                 stm32f7_get_lower_rate(setup->speed_freq);
 668                         dev_warn(i2c_dev->dev,
 669                                  "downgrade I2C Speed Freq to (%i)\n",
 670                                  setup->speed_freq);
 671                 }
 672         } while (ret);
 673
 674         if (ret) {
 675                 dev_err(i2c_dev->dev, "Impossible to compute I2C timings.\n");
 676                 return ret;
 677         }
 678
 679         dev_dbg(i2c_dev->dev, "I2C Speed(%i), Clk Source(%i)\n",
 680                 setup->speed_freq, setup->clock_src);
 681         dev_dbg(i2c_dev->dev, "I2C Rise(%i) and Fall(%i) Time\n",
 682                 setup->rise_time, setup->fall_time);
 683         dev_dbg(i2c_dev->dev, "I2C Analog Filter(%s), DNF(%i)\n",
 684                 (setup->analog_filter ? "On" : "Off"), setup->dnf);
 685
 686         i2c_dev->bus_rate = setup->speed_freq;
 687
 688         return 0;
 689 }
 690
 691 static void stm32f7_i2c_disable_dma_req(struct stm32f7_i2c_dev *i2c_dev)
 692 {
 693         void __iomem *base = i2c_dev->base;
 694         u32 mask = STM32F7_I2C_CR1_RXDMAEN | STM32F7_I2C_CR1_TXDMAEN;
 695
 696         stm32f7_i2c_clr_bits(base + STM32F7_I2C_CR1, mask);
 697 }
 698
 699 static void stm32f7_i2c_dma_callback(void *arg)
 700 {
 701         struct stm32f7_i2c_dev *i2c_dev = (struct stm32f7_i2c_dev *)arg;
 702         struct stm32_i2c_dma *dma = i2c_dev->dma;
 703         struct device *dev = dma->chan_using->device->dev;
 704
 705         stm32f7_i2c_disable_dma_req(i2c_dev);
 706         dma_unmap_single(dev, dma->dma_buf, dma->dma_len, dma->dma_data_dir);
 707         complete(&dma->dma_complete);
 708 }
 709
 710 static void stm32f7_i2c_hw_config(struct stm32f7_i2c_dev *i2c_dev)
 711 {
 712         struct stm32f7_i2c_timings *t = &i2c_dev->timing;
 713         u32 timing = 0;
 714
 715         /* Timing settings */
 716         timing |= STM32F7_I2C_TIMINGR_PRESC(t->presc);
 717         timing |= STM32F7_I2C_TIMINGR_SCLDEL(t->scldel);
 718         timing |= STM32F7_I2C_TIMINGR_SDADEL(t->sdadel);
 719         timing |= STM32F7_I2C_TIMINGR_SCLH(t->sclh);
 720         timing |= STM32F7_I2C_TIMINGR_SCLL(t->scll);
 721         writel_relaxed(timing, i2c_dev->base + STM32F7_I2C_TIMINGR);
 722
 723         /* Enable I2C */
 724         if (i2c_dev->setup.analog_filter)
 725                 stm32f7_i2c_clr_bits(i2c_dev->base + STM32F7_I2C_CR1,
 726                                      STM32F7_I2C_CR1_ANFOFF);
 727         else
 728                 stm32f7_i2c_set_bits(i2c_dev->base + STM32F7_I2C_CR1,
 729                                      STM32F7_I2C_CR1_ANFOFF);
 730
 731         /* Program the Digital Filter */
 732         stm32f7_i2c_clr_bits(i2c_dev->base + STM32F7_I2C_CR1,
 733                              STM32F7_I2C_CR1_DNF_MASK);
 734         stm32f7_i2c_set_bits(i2c_dev->base + STM32F7_I2C_CR1,
 735                              STM32F7_I2C_CR1_DNF(i2c_dev->setup.dnf));
 736
 737         stm32f7_i2c_set_bits(i2c_dev->base + STM32F7_I2C_CR1,
 738                              STM32F7_I2C_CR1_PE);
 739 }
 740
 741 static void stm32f7_i2c_write_tx_data(struct stm32f7_i2c_dev *i2c_dev)
 742 {
 743         struct stm32f7_i2c_msg *f7_msg = &i2c_dev->f7_msg;
 744         void __iomem *base = i2c_dev->base;
 745
 746         if (f7_msg->count) {
 747                 writeb_relaxed(*f7_msg->buf++, base + STM32F7_I2C_TXDR);
 748                 f7_msg->count--;
 749         }
 750 }
 751
 752 static void stm32f7_i2c_read_rx_data(struct stm32f7_i2c_dev *i2c_dev)
 753 {
 754         struct stm32f7_i2c_msg *f7_msg = &i2c_dev->f7_msg;
 755         void __iomem *base = i2c_dev->base;
 756
 757         if (f7_msg->count) {
 758                 *f7_msg->buf++ = readb_relaxed(base + STM32F7_I2C_RXDR);
 759                 f7_msg->count--;
 760         } else {
 761                 /* Flush RX buffer has no data is expected */
 762                 readb_relaxed(base + STM32F7_I2C_RXDR);
 763         }
 764 }
 765
 766 static void stm32f7_i2c_reload(struct stm32f7_i2c_dev *i2c_dev)
 767 {
 768         struct stm32f7_i2c_msg *f7_msg = &i2c_dev->f7_msg;
 769         u32 cr2;
 770
 771         if (i2c_dev->use_dma)
 772                 f7_msg->count -= STM32F7_I2C_MAX_LEN;
 773
 774         cr2 = readl_relaxed(i2c_dev->base + STM32F7_I2C_CR2);
 775
 776         cr2 &= ~STM32F7_I2C_CR2_NBYTES_MASK;
 777         if (f7_msg->count > STM32F7_I2C_MAX_LEN) {
 778                 cr2 |= STM32F7_I2C_CR2_NBYTES(STM32F7_I2C_MAX_LEN);
 779         } else {
 780                 cr2 &= ~STM32F7_I2C_CR2_RELOAD;
 781                 cr2 |= STM32F7_I2C_CR2_NBYTES(f7_msg->count);
 782         }
 783
 784         writel_relaxed(cr2, i2c_dev->base + STM32F7_I2C_CR2);
 785 }
 786
 787 static void stm32f7_i2c_smbus_reload(struct stm32f7_i2c_dev *i2c_dev)
 788 {
 789         struct stm32f7_i2c_msg *f7_msg = &i2c_dev->f7_msg;
 790         u32 cr2;
 791         u8 *val;
 792
 793         /*
 794          * For I2C_SMBUS_BLOCK_DATA && I2C_SMBUS_BLOCK_PROC_CALL, the first
 795          * data received inform us how many data will follow.
 796          */
 797         stm32f7_i2c_read_rx_data(i2c_dev);
 798
 799         /*
 800          * Update NBYTES with the value read to continue the transfer
 801          */
 802         val = f7_msg->buf - sizeof(u8);
 803         f7_msg->count = *val;
 804         cr2 = readl_relaxed(i2c_dev->base + STM32F7_I2C_CR2);
 805         cr2 &= ~(STM32F7_I2C_CR2_NBYTES_MASK | STM32F7_I2C_CR2_RELOAD);
 806         cr2 |= STM32F7_I2C_CR2_NBYTES(f7_msg->count);
 807         writel_relaxed(cr2, i2c_dev->base + STM32F7_I2C_CR2);
 808 }
 809
 810 static int stm32f7_i2c_release_bus(struct i2c_adapter *i2c_adap)
 811 {
 812         struct stm32f7_i2c_dev *i2c_dev = i2c_get_adapdata(i2c_adap);
 813
 814         dev_info(i2c_dev->dev, "Trying to recover bus\n");
 815
 816         stm32f7_i2c_clr_bits(i2c_dev->base + STM32F7_I2C_CR1,
 817                              STM32F7_I2C_CR1_PE);
 818
 819         stm32f7_i2c_hw_config(i2c_dev);
 820
 821         return 0;
 822 }
 823
 824 static int stm32f7_i2c_wait_free_bus(struct stm32f7_i2c_dev *i2c_dev)
 825 {
 826         u32 status;
 827         int ret;
 828
 829         ret = readl_relaxed_poll_timeout(i2c_dev->base + STM32F7_I2C_ISR,
 830                                          status,
 831                                          !(status & STM32F7_I2C_ISR_BUSY),
 832                                          10, 1000);
 833         if (!ret)
 834                 return 0;
 835
 836         dev_info(i2c_dev->dev, "bus busy\n");
 837
 838         ret = stm32f7_i2c_release_bus(&i2c_dev->adap);
 839         if (ret) {
 840                 dev_err(i2c_dev->dev, "Failed to recover the bus (%d)\n", ret);
 841                 return ret;
 842         }
 843
 844         return -EBUSY;
 845 }
 846
 847 static void stm32f7_i2c_xfer_msg(struct stm32f7_i2c_dev *i2c_dev,
 848                                  struct i2c_msg *msg)
 849 {
 850         struct stm32f7_i2c_msg *f7_msg = &i2c_dev->f7_msg;
 851         void __iomem *base = i2c_dev->base;
 852         u32 cr1, cr2;
 853         int ret;
 854
 855         f7_msg->addr = msg->addr;
 856         f7_msg->buf = msg->buf;
 857         f7_msg->count = msg->len;
 858         f7_msg->result = 0;
 859         f7_msg->stop = (i2c_dev->msg_id >= i2c_dev->msg_num - 1);
 860
 861         reinit_completion(&i2c_dev->complete);
 862
 863         cr1 = readl_relaxed(base + STM32F7_I2C_CR1);
 864         cr2 = readl_relaxed(base + STM32F7_I2C_CR2);
 865
 866         /* Set transfer direction */
 867         cr2 &= ~STM32F7_I2C_CR2_RD_WRN;
 868         if (msg->flags & I2C_M_RD)
 869                 cr2 |= STM32F7_I2C_CR2_RD_WRN;
 870
 871         /* Set slave address */
 872         cr2 &= ~(STM32F7_I2C_CR2_HEAD10R | STM32F7_I2C_CR2_ADD10);
 873         if (msg->flags & I2C_M_TEN) {
 874                 cr2 &= ~STM32F7_I2C_CR2_SADD10_MASK;
 875                 cr2 |= STM32F7_I2C_CR2_SADD10(f7_msg->addr);
 876                 cr2 |= STM32F7_I2C_CR2_ADD10;
 877         } else {
 878                 cr2 &= ~STM32F7_I2C_CR2_SADD7_MASK;
 879                 cr2 |= STM32F7_I2C_CR2_SADD7(f7_msg->addr);
 880         }
 881
 882         /* Set nb bytes to transfer and reload if needed */
 883         cr2 &= ~(STM32F7_I2C_CR2_NBYTES_MASK | STM32F7_I2C_CR2_RELOAD);
 884         if (f7_msg->count > STM32F7_I2C_MAX_LEN) {
 885                 cr2 |= STM32F7_I2C_CR2_NBYTES(STM32F7_I2C_MAX_LEN);
 886                 cr2 |= STM32F7_I2C_CR2_RELOAD;
 887         } else {
 888                 cr2 |= STM32F7_I2C_CR2_NBYTES(f7_msg->count);
 889         }
 890
 891         /* Enable NACK, STOP, error and transfer complete interrupts */
 892         cr1 |= STM32F7_I2C_CR1_ERRIE | STM32F7_I2C_CR1_TCIE |
 893                 STM32F7_I2C_CR1_STOPIE | STM32F7_I2C_CR1_NACKIE;
 894
 895         /* Clear DMA req and TX/RX interrupt */
 896         cr1 &= ~(STM32F7_I2C_CR1_RXIE | STM32F7_I2C_CR1_TXIE |
 897                         STM32F7_I2C_CR1_RXDMAEN | STM32F7_I2C_CR1_TXDMAEN);
 898
 899         /* Configure DMA or enable RX/TX interrupt */
 900         i2c_dev->use_dma = false;
 901         if (i2c_dev->dma && f7_msg->count >= STM32F7_I2C_DMA_LEN_MIN) {
 902                 ret = stm32_i2c_prep_dma_xfer(i2c_dev->dev, i2c_dev->dma,
 903                                               msg->flags & I2C_M_RD,
 904                                               f7_msg->count, f7_msg->buf,
 905                                               stm32f7_i2c_dma_callback,
 906                                               i2c_dev);
 907                 if (!ret)
 908                         i2c_dev->use_dma = true;
 909                 else
 910                         dev_warn(i2c_dev->dev, "can't use DMA\n");
 911         }
 912
 913         if (!i2c_dev->use_dma) {
 914                 if (msg->flags & I2C_M_RD)
 915                         cr1 |= STM32F7_I2C_CR1_RXIE;
 916                 else
 917                         cr1 |= STM32F7_I2C_CR1_TXIE;
 918         } else {
 919                 if (msg->flags & I2C_M_RD)
 920                         cr1 |= STM32F7_I2C_CR1_RXDMAEN;
 921                 else
 922                         cr1 |= STM32F7_I2C_CR1_TXDMAEN;
 923         }
 924
 925         /* Configure Start/Repeated Start */
 926         cr2 |= STM32F7_I2C_CR2_START;
 927
 928         i2c_dev->master_mode = true;
 929
 930         /* Write configurations registers */
 931         writel_relaxed(cr1, base + STM32F7_I2C_CR1);
 932         writel_relaxed(cr2, base + STM32F7_I2C_CR2);
 933 }
 934
 935 static int stm32f7_i2c_smbus_xfer_msg(struct stm32f7_i2c_dev *i2c_dev,
 936                                       unsigned short flags, u8 command,
 937                                       union i2c_smbus_data *data)
 938 {
 939         struct stm32f7_i2c_msg *f7_msg = &i2c_dev->f7_msg;
 940         struct device *dev = i2c_dev->dev;
 941         void __iomem *base = i2c_dev->base;
 942         u32 cr1, cr2;
 943         int i, ret;
 944
 945         f7_msg->result = 0;
 946         reinit_completion(&i2c_dev->complete);
 947
 948         cr2 = readl_relaxed(base + STM32F7_I2C_CR2);
 949         cr1 = readl_relaxed(base + STM32F7_I2C_CR1);
 950
 951         /* Set transfer direction */
 952         cr2 &= ~STM32F7_I2C_CR2_RD_WRN;
 953         if (f7_msg->read_write)
 954                 cr2 |= STM32F7_I2C_CR2_RD_WRN;
 955
 956         /* Set slave address */
 957         cr2 &= ~(STM32F7_I2C_CR2_ADD10 | STM32F7_I2C_CR2_SADD7_MASK);
 958         cr2 |= STM32F7_I2C_CR2_SADD7(f7_msg->addr);
 959
 960         f7_msg->smbus_buf[0] = command;
 961         switch (f7_msg->size) {
 962         case I2C_SMBUS_QUICK:
 963                 f7_msg->stop = true;
 964                 f7_msg->count = 0;
 965                 break;
 966         case I2C_SMBUS_BYTE:
 967                 f7_msg->stop = true;
 968                 f7_msg->count = 1;
 969                 break;
 970         case I2C_SMBUS_BYTE_DATA:
 971                 if (f7_msg->read_write) {
 972                         f7_msg->stop = false;
 973                         f7_msg->count = 1;
 974                         cr2 &= ~STM32F7_I2C_CR2_RD_WRN;
 975                 } else {
 976                         f7_msg->stop = true;
 977                         f7_msg->count = 2;
 978                         f7_msg->smbus_buf[1] = data->byte;
 979                 }
 980                 break;
 981         case I2C_SMBUS_WORD_DATA:
 982                 if (f7_msg->read_write) {
 983                         f7_msg->stop = false;
 984                         f7_msg->count = 1;
 985                         cr2 &= ~STM32F7_I2C_CR2_RD_WRN;
 986                 } else {
 987                         f7_msg->stop = true;
 988                         f7_msg->count = 3;
 989                         f7_msg->smbus_buf[1] = data->word & 0xff;
 990                         f7_msg->smbus_buf[2] = data->word >> 8;
 991                 }
 992                 break;
 993         case I2C_SMBUS_BLOCK_DATA:
 994                 if (f7_msg->read_write) {
 995                         f7_msg->stop = false;
 996                         f7_msg->count = 1;
 997                         cr2 &= ~STM32F7_I2C_CR2_RD_WRN;
 998                 } else {
 999                         f7_msg->stop = true;
1000                         if (data->block[0] > I2C_SMBUS_BLOCK_MAX ||
1001                             !data->block[0]) {
1002                                 dev_err(dev, "Invalid block write size %d\n",
1003                                         data->block[0]);
1004                                 return -EINVAL;
1005                         }
1006                         f7_msg->count = data->block[0] + 2;
1007                         for (i = 1; i < f7_msg->count; i++)
1008                                 f7_msg->smbus_buf[i] = data->block[i - 1];
1009                 }
1010                 break;
1011         case I2C_SMBUS_PROC_CALL:
1012                 f7_msg->stop = false;
1013                 f7_msg->count = 3;
1014                 f7_msg->smbus_buf[1] = data->word & 0xff;
1015                 f7_msg->smbus_buf[2] = data->word >> 8;
1016                 cr2 &= ~STM32F7_I2C_CR2_RD_WRN;
1017                 f7_msg->read_write = I2C_SMBUS_READ;
1018                 break;
1019         case I2C_SMBUS_BLOCK_PROC_CALL:
1020                 f7_msg->stop = false;
1021                 if (data->block[0] > I2C_SMBUS_BLOCK_MAX - 1) {
1022                         dev_err(dev, "Invalid block write size %d\n",
1023                                 data->block[0]);
1024                         return -EINVAL;
1025                 }
1026                 f7_msg->count = data->block[0] + 2;
1027                 for (i = 1; i < f7_msg->count; i++)
1028                         f7_msg->smbus_buf[i] = data->block[i - 1];
1029                 cr2 &= ~STM32F7_I2C_CR2_RD_WRN;
1030                 f7_msg->read_write = I2C_SMBUS_READ;
1031                 break;
1032         case I2C_SMBUS_I2C_BLOCK_DATA:
1033                 /* Rely on emulated i2c transfer (through master_xfer) */
1034                 return -EOPNOTSUPP;
1035         default:
1036                 dev_err(dev, "Unsupported smbus protocol %d\n", f7_msg->size);
1037                 return -EOPNOTSUPP;
1038         }
1039
1040         f7_msg->buf = f7_msg->smbus_buf;
1041
1042         /* Configure PEC */
1043         if ((flags & I2C_CLIENT_PEC) && f7_msg->size != I2C_SMBUS_QUICK) {
1044                 cr1 |= STM32F7_I2C_CR1_PECEN;
1045                 cr2 |= STM32F7_I2C_CR2_PECBYTE;
1046                 if (!f7_msg->read_write)
1047                         f7_msg->count++;
1048         } else {
1049                 cr1 &= ~STM32F7_I2C_CR1_PECEN;
1050                 cr2 &= ~STM32F7_I2C_CR2_PECBYTE;
1051         }
1052
1053         /* Set number of bytes to be transferred */
1054         cr2 &= ~(STM32F7_I2C_CR2_NBYTES_MASK | STM32F7_I2C_CR2_RELOAD);
1055         cr2 |= STM32F7_I2C_CR2_NBYTES(f7_msg->count);
1056
1057         /* Enable NACK, STOP, error and transfer complete interrupts */
1058         cr1 |= STM32F7_I2C_CR1_ERRIE | STM32F7_I2C_CR1_TCIE |
1059                 STM32F7_I2C_CR1_STOPIE | STM32F7_I2C_CR1_NACKIE;
1060
1061         /* Clear DMA req and TX/RX interrupt */
1062         cr1 &= ~(STM32F7_I2C_CR1_RXIE | STM32F7_I2C_CR1_TXIE |
1063                         STM32F7_I2C_CR1_RXDMAEN | STM32F7_I2C_CR1_TXDMAEN);
1064
1065         /* Configure DMA or enable RX/TX interrupt */
1066         i2c_dev->use_dma = false;
1067         if (i2c_dev->dma && f7_msg->count >= STM32F7_I2C_DMA_LEN_MIN) {
1068                 ret = stm32_i2c_prep_dma_xfer(i2c_dev->dev, i2c_dev->dma,
1069                                               cr2 & STM32F7_I2C_CR2_RD_WRN,
1070                                               f7_msg->count, f7_msg->buf,
1071                                               stm32f7_i2c_dma_callback,
1072                                               i2c_dev);
1073                 if (!ret)
1074                         i2c_dev->use_dma = true;
1075                 else
1076                         dev_warn(i2c_dev->dev, "can't use DMA\n");
1077         }
1078
1079         if (!i2c_dev->use_dma) {
1080                 if (cr2 & STM32F7_I2C_CR2_RD_WRN)
1081                         cr1 |= STM32F7_I2C_CR1_RXIE;
1082                 else
1083                         cr1 |= STM32F7_I2C_CR1_TXIE;
1084         } else {
1085                 if (cr2 & STM32F7_I2C_CR2_RD_WRN)
1086                         cr1 |= STM32F7_I2C_CR1_RXDMAEN;
1087                 else
1088                         cr1 |= STM32F7_I2C_CR1_TXDMAEN;
1089         }
1090
1091         /* Set Start bit */
1092         cr2 |= STM32F7_I2C_CR2_START;
1093
1094         i2c_dev->master_mode = true;
1095
1096         /* Write configurations registers */
1097         writel_relaxed(cr1, base + STM32F7_I2C_CR1);
1098         writel_relaxed(cr2, base + STM32F7_I2C_CR2);
1099
1100         return 0;
1101 }
1102
1103 static void stm32f7_i2c_smbus_rep_start(struct stm32f7_i2c_dev *i2c_dev)
1104 {
1105         struct stm32f7_i2c_msg *f7_msg = &i2c_dev->f7_msg;
1106         void __iomem *base = i2c_dev->base;
1107         u32 cr1, cr2;
1108         int ret;
1109
1110         cr2 = readl_relaxed(base + STM32F7_I2C_CR2);
1111         cr1 = readl_relaxed(base + STM32F7_I2C_CR1);
1112
1113         /* Set transfer direction */
1114         cr2 |= STM32F7_I2C_CR2_RD_WRN;
1115
1116         switch (f7_msg->size) {
1117         case I2C_SMBUS_BYTE_DATA:
1118                 f7_msg->count = 1;
1119                 break;
1120         case I2C_SMBUS_WORD_DATA:
1121         case I2C_SMBUS_PROC_CALL:
1122                 f7_msg->count = 2;
1123                 break;
1124         case I2C_SMBUS_BLOCK_DATA:
1125         case I2C_SMBUS_BLOCK_PROC_CALL:
1126                 f7_msg->count = 1;
1127                 cr2 |= STM32F7_I2C_CR2_RELOAD;
1128                 break;
1129         }
1130
1131         f7_msg->buf = f7_msg->smbus_buf;
1132         f7_msg->stop = true;
1133
1134         /* Add one byte for PEC if needed */
1135         if (cr1 & STM32F7_I2C_CR1_PECEN)
1136                 f7_msg->count++;
1137
1138         /* Set number of bytes to be transferred */
1139         cr2 &= ~(STM32F7_I2C_CR2_NBYTES_MASK);
1140         cr2 |= STM32F7_I2C_CR2_NBYTES(f7_msg->count);
1141
1142         /*
1143          * Configure RX/TX interrupt:
1144          */
1145         cr1 &= ~(STM32F7_I2C_CR1_RXIE | STM32F7_I2C_CR1_TXIE);
1146         cr1 |= STM32F7_I2C_CR1_RXIE;
1147
1148         /*
1149          * Configure DMA or enable RX/TX interrupt:
1150          * For I2C_SMBUS_BLOCK_DATA and I2C_SMBUS_BLOCK_PROC_CALL we don't use
1151          * dma as we don't know in advance how many data will be received
1152          */
1153         cr1 &= ~(STM32F7_I2C_CR1_RXIE | STM32F7_I2C_CR1_TXIE |
1154                  STM32F7_I2C_CR1_RXDMAEN | STM32F7_I2C_CR1_TXDMAEN);
1155
1156         i2c_dev->use_dma = false;
1157         if (i2c_dev->dma && f7_msg->count >= STM32F7_I2C_DMA_LEN_MIN &&
1158             f7_msg->size != I2C_SMBUS_BLOCK_DATA &&
1159             f7_msg->size != I2C_SMBUS_BLOCK_PROC_CALL) {
1160                 ret = stm32_i2c_prep_dma_xfer(i2c_dev->dev, i2c_dev->dma,
1161                                               cr2 & STM32F7_I2C_CR2_RD_WRN,
1162                                               f7_msg->count, f7_msg->buf,
1163                                               stm32f7_i2c_dma_callback,
1164                                               i2c_dev);
1165
1166                 if (!ret)
1167                         i2c_dev->use_dma = true;
1168                 else
1169                         dev_warn(i2c_dev->dev, "can't use DMA\n");
1170         }
1171
1172         if (!i2c_dev->use_dma)
1173                 cr1 |= STM32F7_I2C_CR1_RXIE;
1174         else
1175                 cr1 |= STM32F7_I2C_CR1_RXDMAEN;
1176
1177         /* Configure Repeated Start */
1178         cr2 |= STM32F7_I2C_CR2_START;
1179
1180         /* Write configurations registers */
1181         writel_relaxed(cr1, base + STM32F7_I2C_CR1);
1182         writel_relaxed(cr2, base + STM32F7_I2C_CR2);
1183 }
1184
1185 static int stm32f7_i2c_smbus_check_pec(struct stm32f7_i2c_dev *i2c_dev)
1186 {
1187         struct stm32f7_i2c_msg *f7_msg = &i2c_dev->f7_msg;
1188         u8 count, internal_pec, received_pec;
1189
1190         internal_pec = readl_relaxed(i2c_dev->base + STM32F7_I2C_PECR);
1191
1192         switch (f7_msg->size) {
1193         case I2C_SMBUS_BYTE:
1194         case I2C_SMBUS_BYTE_DATA:
1195                 received_pec = f7_msg->smbus_buf[1];
1196                 break;
1197         case I2C_SMBUS_WORD_DATA:
1198         case I2C_SMBUS_PROC_CALL:
1199                 received_pec = f7_msg->smbus_buf[2];
1200                 break;
1201         case I2C_SMBUS_BLOCK_DATA:
1202         case I2C_SMBUS_BLOCK_PROC_CALL:
1203                 count = f7_msg->smbus_buf[0];
1204                 received_pec = f7_msg->smbus_buf[count];
1205                 break;
1206         default:
1207                 dev_err(i2c_dev->dev, "Unsupported smbus protocol for PEC\n");
1208                 return -EINVAL;
1209         }
1210
1211         if (internal_pec != received_pec) {
1212                 dev_err(i2c_dev->dev, "Bad PEC 0x%02x vs. 0x%02x\n",
1213                         internal_pec, received_pec);
1214                 return -EBADMSG;
1215         }
1216
1217         return 0;
1218 }
1219
1220 static bool stm32f7_i2c_is_addr_match(struct i2c_client *slave, u32 addcode)
1221 {
1222         u32 addr;
1223
1224         if (!slave)
1225                 return false;
1226
1227         if (slave->flags & I2C_CLIENT_TEN) {
1228                 /*
1229                  * For 10-bit addr, addcode = 11110XY with
1230                  * X = Bit 9 of slave address
1231                  * Y = Bit 8 of slave address
1232                  */
1233                 addr = slave->addr >> 8;
1234                 addr |= 0x78;
1235                 if (addr == addcode)
1236                         return true;
1237         } else {
1238                 addr = slave->addr & 0x7f;
1239                 if (addr == addcode)
1240                         return true;
1241         }
1242
1243         return false;
1244 }
1245
1246 static void stm32f7_i2c_slave_start(struct stm32f7_i2c_dev *i2c_dev)
1247 {
1248         struct i2c_client *slave = i2c_dev->slave_running;
1249         void __iomem *base = i2c_dev->base;
1250         u32 mask;
1251         u8 value = 0;
1252
1253         if (i2c_dev->slave_dir) {
1254                 /* Notify i2c slave that new read transfer is starting */
1255                 i2c_slave_event(slave, I2C_SLAVE_READ_REQUESTED, &value);
1256
1257                 /*
1258                  * Disable slave TX config in case of I2C combined message
1259                  * (I2C Write followed by I2C Read)
1260                  */
1261                 mask = STM32F7_I2C_CR2_RELOAD;
1262                 stm32f7_i2c_clr_bits(base + STM32F7_I2C_CR2, mask);
1263                 mask = STM32F7_I2C_CR1_SBC | STM32F7_I2C_CR1_RXIE |
1264                        STM32F7_I2C_CR1_TCIE;
1265                 stm32f7_i2c_clr_bits(base + STM32F7_I2C_CR1, mask);
1266
1267                 /* Enable TX empty, STOP, NACK interrupts */
1268                 mask =  STM32F7_I2C_CR1_STOPIE | STM32F7_I2C_CR1_NACKIE |
1269                         STM32F7_I2C_CR1_TXIE;
1270                 stm32f7_i2c_set_bits(base + STM32F7_I2C_CR1, mask);
1271
1272                 /* Write 1st data byte */
1273                 writel_relaxed(value, base + STM32F7_I2C_TXDR);
1274         } else {
1275                 /* Notify i2c slave that new write transfer is starting */
1276                 i2c_slave_event(slave, I2C_SLAVE_WRITE_REQUESTED, &value);
1277
1278                 /* Set reload mode to be able to ACK/NACK each received byte */
1279                 mask = STM32F7_I2C_CR2_RELOAD;
1280                 stm32f7_i2c_set_bits(base + STM32F7_I2C_CR2, mask);
1281
1282                 /*
1283                  * Set STOP, NACK, RX empty and transfer complete interrupts.*
1284                  * Set Slave Byte Control to be able to ACK/NACK each data
1285                  * byte received
1286                  */
1287                 mask =  STM32F7_I2C_CR1_STOPIE | STM32F7_I2C_CR1_NACKIE |
1288                         STM32F7_I2C_CR1_SBC | STM32F7_I2C_CR1_RXIE |
1289                         STM32F7_I2C_CR1_TCIE;
1290                 stm32f7_i2c_set_bits(base + STM32F7_I2C_CR1, mask);
1291         }
1292 }
1293
1294 static void stm32f7_i2c_slave_addr(struct stm32f7_i2c_dev *i2c_dev)
1295 {
1296         void __iomem *base = i2c_dev->base;
1297         u32 isr, addcode, dir, mask;
1298         int i;
1299
1300         isr = readl_relaxed(i2c_dev->base + STM32F7_I2C_ISR);
1301         addcode = STM32F7_I2C_ISR_ADDCODE_GET(isr);
1302         dir = isr & STM32F7_I2C_ISR_DIR;
1303
1304         for (i = 0; i < STM32F7_I2C_MAX_SLAVE; i++) {
1305                 if (stm32f7_i2c_is_addr_match(i2c_dev->slave[i], addcode)) {
1306                         i2c_dev->slave_running = i2c_dev->slave[i];
1307                         i2c_dev->slave_dir = dir;
1308
1309                         /* Start I2C slave processing */
1310                         stm32f7_i2c_slave_start(i2c_dev);
1311
1312                         /* Clear ADDR flag */
1313                         mask = STM32F7_I2C_ICR_ADDRCF;
1314                         writel_relaxed(mask, base + STM32F7_I2C_ICR);
1315                         break;
1316                 }
1317         }
1318 }
1319
1320 static int stm32f7_i2c_get_slave_id(struct stm32f7_i2c_dev *i2c_dev,
1321                                     struct i2c_client *slave, int *id)
1322 {
1323         int i;
1324
1325         for (i = 0; i < STM32F7_I2C_MAX_SLAVE; i++) {
1326                 if (i2c_dev->slave[i] == slave) {
1327                         *id = i;
1328                         return 0;
1329                 }
1330         }
1331
1332         dev_err(i2c_dev->dev, "Slave 0x%x not registered\n", slave->addr);
1333
1334         return -ENODEV;
1335 }
1336
1337 static int stm32f7_i2c_get_free_slave_id(struct stm32f7_i2c_dev *i2c_dev,
1338                                          struct i2c_client *slave, int *id)
1339 {
1340         struct device *dev = i2c_dev->dev;
1341         int i;
1342
1343         /*
1344          * slave[STM32F7_SLAVE_HOSTNOTIFY] support only SMBus Host address (0x8)
1345          * slave[STM32F7_SLAVE_7_10_BITS_ADDR] supports 7-bit and 10-bit slave address
1346          * slave[STM32F7_SLAVE_7_BITS_ADDR] supports 7-bit slave address only
1347          */
1348         if (i2c_dev->smbus_mode && (slave->addr == 0x08)) {
1349                 if (i2c_dev->slave[STM32F7_SLAVE_HOSTNOTIFY])
1350                         goto fail;
1351                 *id = STM32F7_SLAVE_HOSTNOTIFY;
1352                 return 0;
1353         }
1354
1355         for (i = STM32F7_I2C_MAX_SLAVE - 1; i > STM32F7_SLAVE_HOSTNOTIFY; i--) {
1356                 if ((i == STM32F7_SLAVE_7_BITS_ADDR) &&
1357                     (slave->flags & I2C_CLIENT_TEN))
1358                         continue;
1359                 if (!i2c_dev->slave[i]) {
1360                         *id = i;
1361                         return 0;
1362                 }
1363         }
1364
1365 fail:
1366         dev_err(dev, "Slave 0x%x could not be registered\n", slave->addr);
1367
1368         return -EINVAL;
1369 }
1370
1371 static bool stm32f7_i2c_is_slave_registered(struct stm32f7_i2c_dev *i2c_dev)
1372 {
1373         int i;
1374
1375         for (i = 0; i < STM32F7_I2C_MAX_SLAVE; i++) {
1376                 if (i2c_dev->slave[i])
1377                         return true;
1378         }
1379
1380         return false;
1381 }
1382
1383 static bool stm32f7_i2c_is_slave_busy(struct stm32f7_i2c_dev *i2c_dev)
1384 {
1385         int i, busy;
1386
1387         busy = 0;
1388         for (i = 0; i < STM32F7_I2C_MAX_SLAVE; i++) {
1389                 if (i2c_dev->slave[i])
1390                         busy++;
1391         }
1392
1393         return i == busy;
1394 }
1395
1396 static irqreturn_t stm32f7_i2c_slave_isr_event(struct stm32f7_i2c_dev *i2c_dev)
1397 {
1398         void __iomem *base = i2c_dev->base;
1399         u32 cr2, status, mask;
1400         u8 val;
1401         int ret;
1402
1403         status = readl_relaxed(i2c_dev->base + STM32F7_I2C_ISR);
1404
1405         /* Slave transmitter mode */
1406         if (status & STM32F7_I2C_ISR_TXIS) {
1407                 i2c_slave_event(i2c_dev->slave_running,
1408                                 I2C_SLAVE_READ_PROCESSED,
1409                                 &val);
1410
1411                 /* Write data byte */
1412                 writel_relaxed(val, base + STM32F7_I2C_TXDR);
1413         }
1414
1415         /* Transfer Complete Reload for Slave receiver mode */
1416         if (status & STM32F7_I2C_ISR_TCR || status & STM32F7_I2C_ISR_RXNE) {
1417                 /*
1418                  * Read data byte then set NBYTES to receive next byte or NACK
1419                  * the current received byte
1420                  */
1421                 val = readb_relaxed(i2c_dev->base + STM32F7_I2C_RXDR);
1422                 ret = i2c_slave_event(i2c_dev->slave_running,
1423                                       I2C_SLAVE_WRITE_RECEIVED,
1424                                       &val);
1425                 if (!ret) {
1426                         cr2 = readl_relaxed(i2c_dev->base + STM32F7_I2C_CR2);
1427                         cr2 |= STM32F7_I2C_CR2_NBYTES(1);
1428                         writel_relaxed(cr2, i2c_dev->base + STM32F7_I2C_CR2);
1429                 } else {
1430                         mask = STM32F7_I2C_CR2_NACK;
1431                         stm32f7_i2c_set_bits(base + STM32F7_I2C_CR2, mask);
1432                 }
1433         }
1434
1435         /* NACK received */
1436         if (status & STM32F7_I2C_ISR_NACKF) {
1437                 dev_dbg(i2c_dev->dev, "<%s>: Receive NACK\n", __func__);
1438                 writel_relaxed(STM32F7_I2C_ICR_NACKCF, base + STM32F7_I2C_ICR);
1439         }
1440
1441         /* STOP received */
1442         if (status & STM32F7_I2C_ISR_STOPF) {
1443                 /* Disable interrupts */
1444                 stm32f7_i2c_disable_irq(i2c_dev, STM32F7_I2C_XFER_IRQ_MASK);
1445
1446                 if (i2c_dev->slave_dir) {
1447                         /*
1448                          * Flush TX buffer in order to not used the byte in
1449                          * TXDR for the next transfer
1450                          */
1451                         mask = STM32F7_I2C_ISR_TXE;
1452                         stm32f7_i2c_set_bits(base + STM32F7_I2C_ISR, mask);
1453                 }
1454
1455                 /* Clear STOP flag */
1456                 writel_relaxed(STM32F7_I2C_ICR_STOPCF, base + STM32F7_I2C_ICR);
1457
1458                 /* Notify i2c slave that a STOP flag has been detected */
1459                 i2c_slave_event(i2c_dev->slave_running, I2C_SLAVE_STOP, &val);
1460
1461                 i2c_dev->slave_running = NULL;
1462         }
1463
1464         /* Address match received */
1465         if (status & STM32F7_I2C_ISR_ADDR)
1466                 stm32f7_i2c_slave_addr(i2c_dev);
1467
1468         return IRQ_HANDLED;
1469 }
1470
1471 static irqreturn_t stm32f7_i2c_isr_event(int irq, void *data)
1472 {
1473         struct stm32f7_i2c_dev *i2c_dev = data;
1474         struct stm32f7_i2c_msg *f7_msg = &i2c_dev->f7_msg;
1475         void __iomem *base = i2c_dev->base;
1476         u32 status, mask;
1477         int ret = IRQ_HANDLED;
1478
1479         /* Check if the interrupt if for a slave device */
1480         if (!i2c_dev->master_mode) {
1481                 ret = stm32f7_i2c_slave_isr_event(i2c_dev);
1482                 return ret;
1483         }
1484
1485         status = readl_relaxed(i2c_dev->base + STM32F7_I2C_ISR);
1486
1487         /* Tx empty */
1488         if (status & STM32F7_I2C_ISR_TXIS)
1489                 stm32f7_i2c_write_tx_data(i2c_dev);
1490
1491         /* RX not empty */
1492         if (status & STM32F7_I2C_ISR_RXNE)
1493                 stm32f7_i2c_read_rx_data(i2c_dev);
1494
1495         /* NACK received */
1496         if (status & STM32F7_I2C_ISR_NACKF) {
1497                 dev_dbg(i2c_dev->dev, "<%s>: Receive NACK (addr %x)\n",
1498                         __func__, f7_msg->addr);
1499                 writel_relaxed(STM32F7_I2C_ICR_NACKCF, base + STM32F7_I2C_ICR);
1500                 f7_msg->result = -ENXIO;
1501         }
1502
1503         /* STOP detection flag */
1504         if (status & STM32F7_I2C_ISR_STOPF) {
1505                 /* Disable interrupts */
1506                 if (stm32f7_i2c_is_slave_registered(i2c_dev))
1507                         mask = STM32F7_I2C_XFER_IRQ_MASK;
1508                 else
1509                         mask = STM32F7_I2C_ALL_IRQ_MASK;
1510                 stm32f7_i2c_disable_irq(i2c_dev, mask);
1511
1512                 /* Clear STOP flag */
1513                 writel_relaxed(STM32F7_I2C_ICR_STOPCF, base + STM32F7_I2C_ICR);
1514
1515                 if (i2c_dev->use_dma) {
1516                         ret = IRQ_WAKE_THREAD;
1517                 } else {
1518                         i2c_dev->master_mode = false;
1519                         complete(&i2c_dev->complete);
1520                 }
1521         }
1522
1523         /* Transfer complete */
1524         if (status & STM32F7_I2C_ISR_TC) {
1525                 if (f7_msg->stop) {
1526                         mask = STM32F7_I2C_CR2_STOP;
1527                         stm32f7_i2c_set_bits(base + STM32F7_I2C_CR2, mask);
1528                 } else if (i2c_dev->use_dma) {
1529                         ret = IRQ_WAKE_THREAD;
1530                 } else if (f7_msg->smbus) {
1531                         stm32f7_i2c_smbus_rep_start(i2c_dev);
1532                 } else {
1533                         i2c_dev->msg_id++;
1534                         i2c_dev->msg++;
1535                         stm32f7_i2c_xfer_msg(i2c_dev, i2c_dev->msg);
1536                 }
1537         }
1538
1539         if (status & STM32F7_I2C_ISR_TCR) {
1540                 if (f7_msg->smbus)
1541                         stm32f7_i2c_smbus_reload(i2c_dev);
1542                 else
1543                         stm32f7_i2c_reload(i2c_dev);
1544         }
1545
1546         return ret;
1547 }
1548
1549 static irqreturn_t stm32f7_i2c_isr_event_thread(int irq, void *data)
1550 {
1551         struct stm32f7_i2c_dev *i2c_dev = data;
1552         struct stm32f7_i2c_msg *f7_msg = &i2c_dev->f7_msg;
1553         struct stm32_i2c_dma *dma = i2c_dev->dma;
1554         u32 status;
1555         int ret;
1556
1557         /*
1558          * Wait for dma transfer completion before sending next message or
1559          * notity the end of xfer to the client
1560          */
1561         ret = wait_for_completion_timeout(&i2c_dev->dma->dma_complete, HZ);
1562         if (!ret) {
1563                 dev_dbg(i2c_dev->dev, "<%s>: Timed out\n", __func__);
1564                 stm32f7_i2c_disable_dma_req(i2c_dev);
1565                 dmaengine_terminate_all(dma->chan_using);
1566                 f7_msg->result = -ETIMEDOUT;
1567         }
1568
1569         status = readl_relaxed(i2c_dev->base + STM32F7_I2C_ISR);
1570
1571         if (status & STM32F7_I2C_ISR_TC) {
1572                 if (f7_msg->smbus) {
1573                         stm32f7_i2c_smbus_rep_start(i2c_dev);
1574                 } else {
1575                         i2c_dev->msg_id++;
1576                         i2c_dev->msg++;
1577                         stm32f7_i2c_xfer_msg(i2c_dev, i2c_dev->msg);
1578                 }
1579         } else {
1580                 i2c_dev->master_mode = false;
1581                 complete(&i2c_dev->complete);
1582         }
1583
1584         return IRQ_HANDLED;
1585 }
1586
1587 static irqreturn_t stm32f7_i2c_isr_error(int irq, void *data)
1588 {
1589         struct stm32f7_i2c_dev *i2c_dev = data;
1590         struct stm32f7_i2c_msg *f7_msg = &i2c_dev->f7_msg;
1591         void __iomem *base = i2c_dev->base;
1592         struct device *dev = i2c_dev->dev;
1593         struct stm32_i2c_dma *dma = i2c_dev->dma;
1594         u32 status;
1595
1596         status = readl_relaxed(i2c_dev->base + STM32F7_I2C_ISR);
1597
1598         /* Bus error */
1599         if (status & STM32F7_I2C_ISR_BERR) {
1600                 dev_err(dev, "<%s>: Bus error\n", __func__);
1601                 writel_relaxed(STM32F7_I2C_ICR_BERRCF, base + STM32F7_I2C_ICR);
1602                 stm32f7_i2c_release_bus(&i2c_dev->adap);
1603                 f7_msg->result = -EIO;
1604         }
1605
1606         /* Arbitration loss */
1607         if (status & STM32F7_I2C_ISR_ARLO) {
1608                 dev_dbg(dev, "<%s>: Arbitration loss\n", __func__);
1609                 writel_relaxed(STM32F7_I2C_ICR_ARLOCF, base + STM32F7_I2C_ICR);
1610                 f7_msg->result = -EAGAIN;
1611         }
1612
1613         if (status & STM32F7_I2C_ISR_PECERR) {
1614                 dev_err(dev, "<%s>: PEC error in reception\n", __func__);
1615                 writel_relaxed(STM32F7_I2C_ICR_PECCF, base + STM32F7_I2C_ICR);
1616                 f7_msg->result = -EINVAL;
1617         }
1618
1619         if (!i2c_dev->slave_running) {
1620                 u32 mask;
1621                 /* Disable interrupts */
1622                 if (stm32f7_i2c_is_slave_registered(i2c_dev))
1623                         mask = STM32F7_I2C_XFER_IRQ_MASK;
1624                 else
1625                         mask = STM32F7_I2C_ALL_IRQ_MASK;
1626                 stm32f7_i2c_disable_irq(i2c_dev, mask);
1627         }
1628
1629         /* Disable dma */
1630         if (i2c_dev->use_dma) {
1631                 stm32f7_i2c_disable_dma_req(i2c_dev);
1632                 dmaengine_terminate_all(dma->chan_using);
1633         }
1634
1635         i2c_dev->master_mode = false;
1636         complete(&i2c_dev->complete);
1637
1638         return IRQ_HANDLED;
1639 }
1640
1641 static int stm32f7_i2c_xfer(struct i2c_adapter *i2c_adap,
1642                             struct i2c_msg msgs[], int num)
1643 {
1644         struct stm32f7_i2c_dev *i2c_dev = i2c_get_adapdata(i2c_adap);
1645         struct stm32f7_i2c_msg *f7_msg = &i2c_dev->f7_msg;
1646         struct stm32_i2c_dma *dma = i2c_dev->dma;
1647         unsigned long time_left;
1648         int ret;
1649
1650         i2c_dev->msg = msgs;
1651         i2c_dev->msg_num = num;
1652         i2c_dev->msg_id = 0;
1653         f7_msg->smbus = false;
1654
1655         ret = pm_runtime_get_sync(i2c_dev->dev);
1656         if (ret < 0)
1657                 return ret;
1658
1659         ret = stm32f7_i2c_wait_free_bus(i2c_dev);
1660         if (ret)
1661                 goto pm_free;
1662
1663         stm32f7_i2c_xfer_msg(i2c_dev, msgs);
1664
1665         time_left = wait_for_completion_timeout(&i2c_dev->complete,
1666                                                 i2c_dev->adap.timeout);
1667         ret = f7_msg->result;
1668
1669         if (!time_left) {
1670                 dev_dbg(i2c_dev->dev, "Access to slave 0x%x timed out\n",
1671                         i2c_dev->msg->addr);
1672                 if (i2c_dev->use_dma)
1673                         dmaengine_terminate_all(dma->chan_using);
1674                 ret = -ETIMEDOUT;
1675         }
1676
1677 pm_free:
1678         pm_runtime_mark_last_busy(i2c_dev->dev);
1679         pm_runtime_put_autosuspend(i2c_dev->dev);
1680
1681         return (ret < 0) ? ret : num;
1682 }
1683
1684 static int stm32f7_i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
1685                                   unsigned short flags, char read_write,
1686                                   u8 command, int size,
1687                                   union i2c_smbus_data *data)
1688 {
1689         struct stm32f7_i2c_dev *i2c_dev = i2c_get_adapdata(adapter);
1690         struct stm32f7_i2c_msg *f7_msg = &i2c_dev->f7_msg;
1691         struct stm32_i2c_dma *dma = i2c_dev->dma;
1692         struct device *dev = i2c_dev->dev;
1693         unsigned long timeout;
1694         int i, ret;
1695
1696         f7_msg->addr = addr;
1697         f7_msg->size = size;
1698         f7_msg->read_write = read_write;
1699         f7_msg->smbus = true;
1700
1701         ret = pm_runtime_get_sync(dev);
1702         if (ret < 0)
1703                 return ret;
1704
1705         ret = stm32f7_i2c_wait_free_bus(i2c_dev);
1706         if (ret)
1707                 goto pm_free;
1708
1709         ret = stm32f7_i2c_smbus_xfer_msg(i2c_dev, flags, command, data);
1710         if (ret)
1711                 goto pm_free;
1712
1713         timeout = wait_for_completion_timeout(&i2c_dev->complete,
1714                                               i2c_dev->adap.timeout);
1715         ret = f7_msg->result;
1716         if (ret)
1717                 goto pm_free;
1718
1719         if (!timeout) {
1720                 dev_dbg(dev, "Access to slave 0x%x timed out\n", f7_msg->addr);
1721                 if (i2c_dev->use_dma)
1722                         dmaengine_terminate_all(dma->chan_using);
1723                 ret = -ETIMEDOUT;
1724                 goto pm_free;
1725         }
1726
1727         /* Check PEC */
1728         if ((flags & I2C_CLIENT_PEC) && size != I2C_SMBUS_QUICK && read_write) {
1729                 ret = stm32f7_i2c_smbus_check_pec(i2c_dev);
1730                 if (ret)
1731                         goto pm_free;
1732         }
1733
1734         if (read_write && size != I2C_SMBUS_QUICK) {
1735                 switch (size) {
1736                 case I2C_SMBUS_BYTE:
1737                 case I2C_SMBUS_BYTE_DATA:
1738                         data->byte = f7_msg->smbus_buf[0];
1739                 break;
1740                 case I2C_SMBUS_WORD_DATA:
1741                 case I2C_SMBUS_PROC_CALL:
1742                         data->word = f7_msg->smbus_buf[0] |
1743                                 (f7_msg->smbus_buf[1] << 8);
1744                 break;
1745                 case I2C_SMBUS_BLOCK_DATA:
1746                 case I2C_SMBUS_BLOCK_PROC_CALL:
1747                 for (i = 0; i <= f7_msg->smbus_buf[0]; i++)
1748                         data->block[i] = f7_msg->smbus_buf[i];
1749                 break;
1750                 default:
1751                         dev_err(dev, "Unsupported smbus transaction\n");
1752                         ret = -EINVAL;
1753                 }
1754         }
1755
1756 pm_free:
1757         pm_runtime_mark_last_busy(dev);
1758         pm_runtime_put_autosuspend(dev);
1759         return ret;
1760 }
1761
1762 static void stm32f7_i2c_enable_wakeup(struct stm32f7_i2c_dev *i2c_dev,
1763                                       bool enable)
1764 {
1765         void __iomem *base = i2c_dev->base;
1766         u32 mask = STM32F7_I2C_CR1_WUPEN;
1767
1768         if (!i2c_dev->wakeup_src)
1769                 return;
1770
1771         if (enable) {
1772                 device_set_wakeup_enable(i2c_dev->dev, true);
1773                 stm32f7_i2c_set_bits(base + STM32F7_I2C_CR1, mask);
1774         } else {
1775                 device_set_wakeup_enable(i2c_dev->dev, false);
1776                 stm32f7_i2c_clr_bits(base + STM32F7_I2C_CR1, mask);
1777         }
1778 }
1779
1780 static int stm32f7_i2c_reg_slave(struct i2c_client *slave)
1781 {
1782         struct stm32f7_i2c_dev *i2c_dev = i2c_get_adapdata(slave->adapter);
1783         void __iomem *base = i2c_dev->base;
1784         struct device *dev = i2c_dev->dev;
1785         u32 oar1, oar2, mask;
1786         int id, ret;
1787
1788         if (slave->flags & I2C_CLIENT_PEC) {
1789                 dev_err(dev, "SMBus PEC not supported in slave mode\n");
1790                 return -EINVAL;
1791         }
1792
1793         if (stm32f7_i2c_is_slave_busy(i2c_dev)) {
1794                 dev_err(dev, "Too much slave registered\n");
1795                 return -EBUSY;
1796         }
1797
1798         ret = stm32f7_i2c_get_free_slave_id(i2c_dev, slave, &id);
1799         if (ret)
1800                 return ret;
1801
1802         ret = pm_runtime_get_sync(dev);
1803         if (ret < 0)
1804                 return ret;
1805
1806         if (!stm32f7_i2c_is_slave_registered(i2c_dev))
1807                 stm32f7_i2c_enable_wakeup(i2c_dev, true);
1808
1809         switch (id) {
1810         case 0:
1811                 /* Slave SMBus Host */
1812                 i2c_dev->slave[id] = slave;
1813                 break;
1814
1815         case 1:
1816                 /* Configure Own Address 1 */
1817                 oar1 = readl_relaxed(i2c_dev->base + STM32F7_I2C_OAR1);
1818                 oar1 &= ~STM32F7_I2C_OAR1_MASK;
1819                 if (slave->flags & I2C_CLIENT_TEN) {
1820                         oar1 |= STM32F7_I2C_OAR1_OA1_10(slave->addr);
1821                         oar1 |= STM32F7_I2C_OAR1_OA1MODE;
1822                 } else {
1823                         oar1 |= STM32F7_I2C_OAR1_OA1_7(slave->addr);
1824                 }
1825                 oar1 |= STM32F7_I2C_OAR1_OA1EN;
1826                 i2c_dev->slave[id] = slave;
1827                 writel_relaxed(oar1, i2c_dev->base + STM32F7_I2C_OAR1);
1828                 break;
1829
1830         case 2:
1831                 /* Configure Own Address 2 */
1832                 oar2 = readl_relaxed(i2c_dev->base + STM32F7_I2C_OAR2);
1833                 oar2 &= ~STM32F7_I2C_OAR2_MASK;
1834                 if (slave->flags & I2C_CLIENT_TEN) {
1835                         ret = -EOPNOTSUPP;
1836                         goto pm_free;
1837                 }
1838
1839                 oar2 |= STM32F7_I2C_OAR2_OA2_7(slave->addr);
1840                 oar2 |= STM32F7_I2C_OAR2_OA2EN;
1841                 i2c_dev->slave[id] = slave;
1842                 writel_relaxed(oar2, i2c_dev->base + STM32F7_I2C_OAR2);
1843                 break;
1844
1845         default:
1846                 dev_err(dev, "I2C slave id not supported\n");
1847                 ret = -ENODEV;
1848                 goto pm_free;
1849         }
1850
1851         /* Enable ACK */
1852         stm32f7_i2c_clr_bits(base + STM32F7_I2C_CR2, STM32F7_I2C_CR2_NACK);
1853
1854         /* Enable Address match interrupt, error interrupt and enable I2C  */
1855         mask = STM32F7_I2C_CR1_ADDRIE | STM32F7_I2C_CR1_ERRIE |
1856                 STM32F7_I2C_CR1_PE;
1857         stm32f7_i2c_set_bits(base + STM32F7_I2C_CR1, mask);
1858
1859         ret = 0;
1860 pm_free:
1861         if (!stm32f7_i2c_is_slave_registered(i2c_dev))
1862                 stm32f7_i2c_enable_wakeup(i2c_dev, false);
1863
1864         pm_runtime_mark_last_busy(dev);
1865         pm_runtime_put_autosuspend(dev);
1866
1867         return ret;
1868 }
1869
1870 static int stm32f7_i2c_unreg_slave(struct i2c_client *slave)
1871 {
1872         struct stm32f7_i2c_dev *i2c_dev = i2c_get_adapdata(slave->adapter);
1873         void __iomem *base = i2c_dev->base;
1874         u32 mask;
1875         int id, ret;
1876
1877         ret = stm32f7_i2c_get_slave_id(i2c_dev, slave, &id);
1878         if (ret)
1879                 return ret;
1880
1881         WARN_ON(!i2c_dev->slave[id]);
1882
1883         ret = pm_runtime_get_sync(i2c_dev->dev);
1884         if (ret < 0)
1885                 return ret;
1886
1887         if (id == 1) {
1888                 mask = STM32F7_I2C_OAR1_OA1EN;
1889                 stm32f7_i2c_clr_bits(base + STM32F7_I2C_OAR1, mask);
1890         } else if (id == 2) {
1891                 mask = STM32F7_I2C_OAR2_OA2EN;
1892                 stm32f7_i2c_clr_bits(base + STM32F7_I2C_OAR2, mask);
1893         }
1894
1895         i2c_dev->slave[id] = NULL;
1896
1897         if (!stm32f7_i2c_is_slave_registered(i2c_dev)) {
1898                 stm32f7_i2c_disable_irq(i2c_dev, STM32F7_I2C_ALL_IRQ_MASK);
1899                 stm32f7_i2c_enable_wakeup(i2c_dev, false);
1900         }
1901
1902         pm_runtime_mark_last_busy(i2c_dev->dev);
1903         pm_runtime_put_autosuspend(i2c_dev->dev);
1904
1905         return 0;
1906 }
1907
1908 static int stm32f7_i2c_write_fm_plus_bits(struct stm32f7_i2c_dev *i2c_dev,
1909                                           bool enable)
1910 {
1911         int ret;
1912
1913         if (i2c_dev->bus_rate <= I2C_MAX_FAST_MODE_FREQ ||
1914             IS_ERR_OR_NULL(i2c_dev->regmap))
1915                 /* Optional */
1916                 return 0;
1917
1918         if (i2c_dev->fmp_sreg == i2c_dev->fmp_creg)
1919                 ret = regmap_update_bits(i2c_dev->regmap,
1920                                          i2c_dev->fmp_sreg,
1921                                          i2c_dev->fmp_mask,
1922                                          enable ? i2c_dev->fmp_mask : 0);
1923         else
1924                 ret = regmap_write(i2c_dev->regmap,
1925                                    enable ? i2c_dev->fmp_sreg :
1926                                             i2c_dev->fmp_creg,
1927                                    i2c_dev->fmp_mask);
1928
1929         return ret;
1930 }
1931
1932 static int stm32f7_i2c_setup_fm_plus_bits(struct platform_device *pdev,
1933                                           struct stm32f7_i2c_dev *i2c_dev)
1934 {
1935         struct device_node *np = pdev->dev.of_node;
1936         int ret;
1937
1938         i2c_dev->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg-fmp");
1939         if (IS_ERR(i2c_dev->regmap))
1940                 /* Optional */
1941                 return 0;
1942
1943         ret = of_property_read_u32_index(np, "st,syscfg-fmp", 1,
1944                                          &i2c_dev->fmp_sreg);
1945         if (ret)
1946                 return ret;
1947
1948         i2c_dev->fmp_creg = i2c_dev->fmp_sreg +
1949                                i2c_dev->setup.fmp_clr_offset;
1950
1951         return of_property_read_u32_index(np, "st,syscfg-fmp", 2,
1952                                           &i2c_dev->fmp_mask);
1953 }
1954
1955 static int stm32f7_i2c_enable_smbus_host(struct stm32f7_i2c_dev *i2c_dev)
1956 {
1957         struct i2c_adapter *adap = &i2c_dev->adap;
1958         void __iomem *base = i2c_dev->base;
1959         struct i2c_client *client;
1960
1961         client = i2c_new_slave_host_notify_device(adap);
1962         if (IS_ERR(client))
1963                 return PTR_ERR(client);
1964
1965         i2c_dev->host_notify_client = client;
1966
1967         /* Enable SMBus Host address */
1968         stm32f7_i2c_set_bits(base + STM32F7_I2C_CR1, STM32F7_I2C_CR1_SMBHEN);
1969
1970         return 0;
1971 }
1972
1973 static void stm32f7_i2c_disable_smbus_host(struct stm32f7_i2c_dev *i2c_dev)
1974 {
1975         void __iomem *base = i2c_dev->base;
1976
1977         if (i2c_dev->host_notify_client) {
1978                 /* Disable SMBus Host address */
1979                 stm32f7_i2c_clr_bits(base + STM32F7_I2C_CR1,
1980                                      STM32F7_I2C_CR1_SMBHEN);
1981                 i2c_free_slave_host_notify_device(i2c_dev->host_notify_client);
1982         }
1983 }
1984
1985 static u32 stm32f7_i2c_func(struct i2c_adapter *adap)
1986 {
1987         struct stm32f7_i2c_dev *i2c_dev = i2c_get_adapdata(adap);
1988
1989         u32 func = I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR | I2C_FUNC_SLAVE |
1990                    I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
1991                    I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
1992                    I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
1993                    I2C_FUNC_SMBUS_PROC_CALL | I2C_FUNC_SMBUS_PEC |
1994                    I2C_FUNC_SMBUS_I2C_BLOCK;
1995
1996         if (i2c_dev->smbus_mode)
1997                 func |= I2C_FUNC_SMBUS_HOST_NOTIFY;
1998
1999         return func;
2000 }
2001
2002 static const struct i2c_algorithm stm32f7_i2c_algo = {
2003         .master_xfer = stm32f7_i2c_xfer,
2004         .smbus_xfer = stm32f7_i2c_smbus_xfer,
2005         .functionality = stm32f7_i2c_func,
2006         .reg_slave = stm32f7_i2c_reg_slave,
2007         .unreg_slave = stm32f7_i2c_unreg_slave,
2008 };
2009
2010 static int stm32f7_i2c_probe(struct platform_device *pdev)
2011 {
2012         struct stm32f7_i2c_dev *i2c_dev;
2013         const struct stm32f7_i2c_setup *setup;
2014         struct resource *res;
2015         struct i2c_adapter *adap;
2016         struct reset_control *rst;
2017         dma_addr_t phy_addr;
2018         int irq_error, irq_event, ret;
2019
2020         i2c_dev = devm_kzalloc(&pdev->dev, sizeof(*i2c_dev), GFP_KERNEL);
2021         if (!i2c_dev)
2022                 return -ENOMEM;
2023
2024         i2c_dev->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
2025         if (IS_ERR(i2c_dev->base))
2026                 return PTR_ERR(i2c_dev->base);
2027         phy_addr = (dma_addr_t)res->start;
2028
2029         irq_event = platform_get_irq(pdev, 0);
2030         if (irq_event <= 0) {
2031                 if (irq_event != -EPROBE_DEFER)
2032                         dev_err(&pdev->dev, "Failed to get IRQ event: %d\n",
2033                                 irq_event);
2034                 return irq_event ? : -ENOENT;
2035         }
2036
2037         irq_error = platform_get_irq(pdev, 1);
2038         if (irq_error <= 0)
2039                 return irq_error ? : -ENOENT;
2040
2041         i2c_dev->wakeup_src = of_property_read_bool(pdev->dev.of_node,
2042                                                     "wakeup-source");
2043
2044         i2c_dev->clk = devm_clk_get(&pdev->dev, NULL);
2045         if (IS_ERR(i2c_dev->clk))
2046                 return dev_err_probe(&pdev->dev, PTR_ERR(i2c_dev->clk),
2047                                      "Failed to get controller clock\n");
2048
2049         ret = clk_prepare_enable(i2c_dev->clk);
2050         if (ret) {
2051                 dev_err(&pdev->dev, "Failed to prepare_enable clock\n");
2052                 return ret;
2053         }
2054
2055         rst = devm_reset_control_get(&pdev->dev, NULL);
2056         if (IS_ERR(rst)) {
2057                 ret = dev_err_probe(&pdev->dev, PTR_ERR(rst),
2058                                     "Error: Missing reset ctrl\n");
2059                 goto clk_free;
2060         }
2061         reset_control_assert(rst);
2062         udelay(2);
2063         reset_control_deassert(rst);
2064
2065         i2c_dev->dev = &pdev->dev;
2066
2067         ret = devm_request_threaded_irq(&pdev->dev, irq_event,
2068                                         stm32f7_i2c_isr_event,
2069                                         stm32f7_i2c_isr_event_thread,
2070                                         IRQF_ONESHOT,
2071                                         pdev->name, i2c_dev);
2072         if (ret) {
2073                 dev_err(&pdev->dev, "Failed to request irq event %i\n",
2074                         irq_event);
2075                 goto clk_free;
2076         }
2077
2078         ret = devm_request_irq(&pdev->dev, irq_error, stm32f7_i2c_isr_error, 0,
2079                                pdev->name, i2c_dev);
2080         if (ret) {
2081                 dev_err(&pdev->dev, "Failed to request irq error %i\n",
2082                         irq_error);
2083                 goto clk_free;
2084         }
2085
2086         setup = of_device_get_match_data(&pdev->dev);
2087         if (!setup) {
2088                 dev_err(&pdev->dev, "Can't get device data\n");
2089                 ret = -ENODEV;
2090                 goto clk_free;
2091         }
2092         i2c_dev->setup = *setup;
2093
2094         ret = stm32f7_i2c_setup_timing(i2c_dev, &i2c_dev->setup);
2095         if (ret)
2096                 goto clk_free;
2097
2098         /* Setup Fast mode plus if necessary */
2099         if (i2c_dev->bus_rate > I2C_MAX_FAST_MODE_FREQ) {
2100                 ret = stm32f7_i2c_setup_fm_plus_bits(pdev, i2c_dev);
2101                 if (ret)
2102                         goto clk_free;
2103                 ret = stm32f7_i2c_write_fm_plus_bits(i2c_dev, true);
2104                 if (ret)
2105                         goto clk_free;
2106         }
2107
2108         adap = &i2c_dev->adap;
2109         i2c_set_adapdata(adap, i2c_dev);
2110         snprintf(adap->name, sizeof(adap->name), "STM32F7 I2C(%pa)",
2111                  &res->start);
2112         adap->owner = THIS_MODULE;
2113         adap->timeout = 2 * HZ;
2114         adap->retries = 3;
2115         adap->algo = &stm32f7_i2c_algo;
2116         adap->dev.parent = &pdev->dev;
2117         adap->dev.of_node = pdev->dev.of_node;
2118
2119         init_completion(&i2c_dev->complete);
2120
2121         /* Init DMA config if supported */
2122         i2c_dev->dma = stm32_i2c_dma_request(i2c_dev->dev, phy_addr,
2123                                              STM32F7_I2C_TXDR,
2124                                              STM32F7_I2C_RXDR);
2125         if (IS_ERR(i2c_dev->dma)) {
2126                 ret = PTR_ERR(i2c_dev->dma);
2127                 /* DMA support is optional, only report other errors */
2128                 if (ret != -ENODEV)
2129                         goto fmp_clear;
2130                 dev_dbg(i2c_dev->dev, "No DMA option: fallback using interrupts\n");
2131                 i2c_dev->dma = NULL;
2132         }
2133
2134         if (i2c_dev->wakeup_src) {
2135                 device_set_wakeup_capable(i2c_dev->dev, true);
2136
2137                 ret = dev_pm_set_wake_irq(i2c_dev->dev, irq_event);
2138                 if (ret) {
2139                         dev_err(i2c_dev->dev, "Failed to set wake up irq\n");
2140                         goto clr_wakeup_capable;
2141                 }
2142         }
2143
2144         platform_set_drvdata(pdev, i2c_dev);
2145
2146         pm_runtime_set_autosuspend_delay(i2c_dev->dev,
2147                                          STM32F7_AUTOSUSPEND_DELAY);
2148         pm_runtime_use_autosuspend(i2c_dev->dev);
2149         pm_runtime_set_active(i2c_dev->dev);
2150         pm_runtime_enable(i2c_dev->dev);
2151
2152         pm_runtime_get_noresume(&pdev->dev);
2153
2154         stm32f7_i2c_hw_config(i2c_dev);
2155
2156         i2c_dev->smbus_mode = of_property_read_bool(pdev->dev.of_node, "smbus");
2157
2158         ret = i2c_add_adapter(adap);
2159         if (ret)
2160                 goto pm_disable;
2161
2162         if (i2c_dev->smbus_mode) {
2163                 ret = stm32f7_i2c_enable_smbus_host(i2c_dev);
2164                 if (ret) {
2165                         dev_err(i2c_dev->dev,
2166                                 "failed to enable SMBus Host-Notify protocol (%d)\n",
2167                                 ret);
2168                         goto i2c_adapter_remove;
2169                 }
2170         }
2171
2172         dev_info(i2c_dev->dev, "STM32F7 I2C-%d bus adapter\n", adap->nr);
2173
2174         pm_runtime_mark_last_busy(i2c_dev->dev);
2175         pm_runtime_put_autosuspend(i2c_dev->dev);
2176
2177         return 0;
2178
2179 i2c_adapter_remove:
2180         i2c_del_adapter(adap);
2181
2182 pm_disable:
2183         pm_runtime_put_noidle(i2c_dev->dev);
2184         pm_runtime_disable(i2c_dev->dev);
2185         pm_runtime_set_suspended(i2c_dev->dev);
2186         pm_runtime_dont_use_autosuspend(i2c_dev->dev);
2187
2188         if (i2c_dev->wakeup_src)
2189                 dev_pm_clear_wake_irq(i2c_dev->dev);
2190
2191 clr_wakeup_capable:
2192         if (i2c_dev->wakeup_src)
2193                 device_set_wakeup_capable(i2c_dev->dev, false);
2194
2195         if (i2c_dev->dma) {
2196                 stm32_i2c_dma_free(i2c_dev->dma);
2197                 i2c_dev->dma = NULL;
2198         }
2199
2200 fmp_clear:
2201         stm32f7_i2c_write_fm_plus_bits(i2c_dev, false);
2202
2203 clk_free:
2204         clk_disable_unprepare(i2c_dev->clk);
2205
2206         return ret;
2207 }
2208
2209 static int stm32f7_i2c_remove(struct platform_device *pdev)
2210 {
2211         struct stm32f7_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
2212
2213         stm32f7_i2c_disable_smbus_host(i2c_dev);
2214
2215         i2c_del_adapter(&i2c_dev->adap);
2216         pm_runtime_get_sync(i2c_dev->dev);
2217
2218         if (i2c_dev->wakeup_src) {
2219                 dev_pm_clear_wake_irq(i2c_dev->dev);
2220                 /*
2221                  * enforce that wakeup is disabled and that the device
2222                  * is marked as non wakeup capable
2223                  */
2224                 device_init_wakeup(i2c_dev->dev, false);
2225         }
2226
2227         pm_runtime_put_noidle(i2c_dev->dev);
2228         pm_runtime_disable(i2c_dev->dev);
2229         pm_runtime_set_suspended(i2c_dev->dev);
2230         pm_runtime_dont_use_autosuspend(i2c_dev->dev);
2231
2232         if (i2c_dev->dma) {
2233                 stm32_i2c_dma_free(i2c_dev->dma);
2234                 i2c_dev->dma = NULL;
2235         }
2236
2237         stm32f7_i2c_write_fm_plus_bits(i2c_dev, false);
2238
2239         clk_disable_unprepare(i2c_dev->clk);
2240
2241         return 0;
2242 }
2243
2244 static int __maybe_unused stm32f7_i2c_runtime_suspend(struct device *dev)
2245 {
2246         struct stm32f7_i2c_dev *i2c_dev = dev_get_drvdata(dev);
2247
2248         if (!stm32f7_i2c_is_slave_registered(i2c_dev))
2249                 clk_disable_unprepare(i2c_dev->clk);
2250
2251         return 0;
2252 }
2253
2254 static int __maybe_unused stm32f7_i2c_runtime_resume(struct device *dev)
2255 {
2256         struct stm32f7_i2c_dev *i2c_dev = dev_get_drvdata(dev);
2257         int ret;
2258
2259         if (!stm32f7_i2c_is_slave_registered(i2c_dev)) {
2260                 ret = clk_prepare_enable(i2c_dev->clk);
2261                 if (ret) {
2262                         dev_err(dev, "failed to prepare_enable clock\n");
2263                         return ret;
2264                 }
2265         }
2266
2267         return 0;
2268 }
2269
2270 #ifdef CONFIG_PM_SLEEP
2271 static int stm32f7_i2c_regs_backup(struct stm32f7_i2c_dev *i2c_dev)
2272 {
2273         int ret;
2274         struct stm32f7_i2c_regs *backup_regs = &i2c_dev->backup_regs;
2275
2276         ret = pm_runtime_get_sync(i2c_dev->dev);
2277         if (ret < 0)
2278                 return ret;
2279
2280         backup_regs->cr1 = readl_relaxed(i2c_dev->base + STM32F7_I2C_CR1);
2281         backup_regs->cr2 = readl_relaxed(i2c_dev->base + STM32F7_I2C_CR2);
2282         backup_regs->oar1 = readl_relaxed(i2c_dev->base + STM32F7_I2C_OAR1);
2283         backup_regs->oar2 = readl_relaxed(i2c_dev->base + STM32F7_I2C_OAR2);
2284         backup_regs->tmgr = readl_relaxed(i2c_dev->base + STM32F7_I2C_TIMINGR);
2285         stm32f7_i2c_write_fm_plus_bits(i2c_dev, false);
2286
2287         pm_runtime_put_sync(i2c_dev->dev);
2288
2289         return ret;
2290 }
2291
2292 static int stm32f7_i2c_regs_restore(struct stm32f7_i2c_dev *i2c_dev)
2293 {
2294         u32 cr1;
2295         int ret;
2296         struct stm32f7_i2c_regs *backup_regs = &i2c_dev->backup_regs;
2297
2298         ret = pm_runtime_get_sync(i2c_dev->dev);
2299         if (ret < 0)
2300                 return ret;
2301
2302         cr1 = readl_relaxed(i2c_dev->base + STM32F7_I2C_CR1);
2303         if (cr1 & STM32F7_I2C_CR1_PE)
2304                 stm32f7_i2c_clr_bits(i2c_dev->base + STM32F7_I2C_CR1,
2305                                      STM32F7_I2C_CR1_PE);
2306
2307         writel_relaxed(backup_regs->tmgr, i2c_dev->base + STM32F7_I2C_TIMINGR);
2308         writel_relaxed(backup_regs->cr1 & ~STM32F7_I2C_CR1_PE,
2309                        i2c_dev->base + STM32F7_I2C_CR1);
2310         if (backup_regs->cr1 & STM32F7_I2C_CR1_PE)
2311                 stm32f7_i2c_set_bits(i2c_dev->base + STM32F7_I2C_CR1,
2312                                      STM32F7_I2C_CR1_PE);
2313         writel_relaxed(backup_regs->cr2, i2c_dev->base + STM32F7_I2C_CR2);
2314         writel_relaxed(backup_regs->oar1, i2c_dev->base + STM32F7_I2C_OAR1);
2315         writel_relaxed(backup_regs->oar2, i2c_dev->base + STM32F7_I2C_OAR2);
2316         stm32f7_i2c_write_fm_plus_bits(i2c_dev, true);
2317
2318         pm_runtime_put_sync(i2c_dev->dev);
2319
2320         return ret;
2321 }
2322
2323 static int stm32f7_i2c_suspend(struct device *dev)
2324 {
2325         struct stm32f7_i2c_dev *i2c_dev = dev_get_drvdata(dev);
2326         int ret;
2327
2328         i2c_mark_adapter_suspended(&i2c_dev->adap);
2329
2330         if (!device_may_wakeup(dev) && !device_wakeup_path(dev)) {
2331                 ret = stm32f7_i2c_regs_backup(i2c_dev);
2332                 if (ret < 0) {
2333                         i2c_mark_adapter_resumed(&i2c_dev->adap);
2334                         return ret;
2335                 }
2336
2337                 pinctrl_pm_select_sleep_state(dev);
2338                 pm_runtime_force_suspend(dev);
2339         }
2340
2341         return 0;
2342 }
2343
2344 static int stm32f7_i2c_resume(struct device *dev)
2345 {
2346         struct stm32f7_i2c_dev *i2c_dev = dev_get_drvdata(dev);
2347         int ret;
2348
2349         if (!device_may_wakeup(dev) && !device_wakeup_path(dev)) {
2350                 ret = pm_runtime_force_resume(dev);
2351                 if (ret < 0)
2352                         return ret;
2353                 pinctrl_pm_select_default_state(dev);
2354
2355                 ret = stm32f7_i2c_regs_restore(i2c_dev);
2356                 if (ret < 0)
2357                         return ret;
2358         }
2359
2360         i2c_mark_adapter_resumed(&i2c_dev->adap);
2361
2362         return 0;
2363 }
2364 #endif
2365
2366 static const struct dev_pm_ops stm32f7_i2c_pm_ops = {
2367         SET_RUNTIME_PM_OPS(stm32f7_i2c_runtime_suspend,
2368                            stm32f7_i2c_runtime_resume, NULL)
2369         SET_SYSTEM_SLEEP_PM_OPS(stm32f7_i2c_suspend, stm32f7_i2c_resume)
2370 };
2371
2372 static const struct of_device_id stm32f7_i2c_match[] = {
2373         { .compatible = "st,stm32f7-i2c", .data = &stm32f7_setup},
2374         { .compatible = "st,stm32mp15-i2c", .data = &stm32mp15_setup},
2375         {},
2376 };
2377 MODULE_DEVICE_TABLE(of, stm32f7_i2c_match);
2378
2379 static struct platform_driver stm32f7_i2c_driver = {
2380         .driver = {
2381                 .name = "stm32f7-i2c",
2382                 .of_match_table = stm32f7_i2c_match,
2383                 .pm = &stm32f7_i2c_pm_ops,
2384         },
2385         .probe = stm32f7_i2c_probe,
2386         .remove = stm32f7_i2c_remove,
2387 };
2388
2389 module_platform_driver(stm32f7_i2c_driver);
2390
2391 MODULE_AUTHOR("M'boumba Cedric Madianga <cedric.madianga@gmail.com>");
2392 MODULE_DESCRIPTION("STMicroelectronics STM32F7 I2C driver");
2393 MODULE_LICENSE("GPL v2");