drivers/i2c/busses/i2c-designware-core.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * Synopsys DesignWare I2C adapter driver.
   4  *
   5  * Based on the TI DAVINCI I2C adapter driver.
   6  *
   7  * Copyright (C) 2006 Texas Instruments.
   8  * Copyright (C) 2007 MontaVista Software Inc.
   9  * Copyright (C) 2009 Provigent Ltd.
  10  */
  11
  12 #include <linux/i2c.h>
  13
  14 #define DW_IC_DEFAULT_FUNCTIONALITY (I2C_FUNC_I2C |                     \
  15                                         I2C_FUNC_SMBUS_BYTE |           \
  16                                         I2C_FUNC_SMBUS_BYTE_DATA |      \
  17                                         I2C_FUNC_SMBUS_WORD_DATA |      \
  18                                         I2C_FUNC_SMBUS_BLOCK_DATA |     \
  19                                         I2C_FUNC_SMBUS_I2C_BLOCK)
  20
  21 #define DW_IC_CON_MASTER                0x1
  22 #define DW_IC_CON_SPEED_STD             0x2
  23 #define DW_IC_CON_SPEED_FAST            0x4
  24 #define DW_IC_CON_SPEED_HIGH            0x6
  25 #define DW_IC_CON_SPEED_MASK            0x6
  26 #define DW_IC_CON_10BITADDR_SLAVE               0x8
  27 #define DW_IC_CON_10BITADDR_MASTER      0x10
  28 #define DW_IC_CON_RESTART_EN            0x20
  29 #define DW_IC_CON_SLAVE_DISABLE         0x40
  30 #define DW_IC_CON_STOP_DET_IFADDRESSED          0x80
  31 #define DW_IC_CON_TX_EMPTY_CTRL         0x100
  32 #define DW_IC_CON_RX_FIFO_FULL_HLD_CTRL         0x200
  33
  34 /*
  35  * Registers offset
  36  */
  37 #define DW_IC_CON               0x0
  38 #define DW_IC_TAR               0x4
  39 #define DW_IC_SAR               0x8
  40 #define DW_IC_DATA_CMD          0x10
  41 #define DW_IC_SS_SCL_HCNT       0x14
  42 #define DW_IC_SS_SCL_LCNT       0x18
  43 #define DW_IC_FS_SCL_HCNT       0x1c
  44 #define DW_IC_FS_SCL_LCNT       0x20
  45 #define DW_IC_HS_SCL_HCNT       0x24
  46 #define DW_IC_HS_SCL_LCNT       0x28
  47 #define DW_IC_INTR_STAT         0x2c
  48 #define DW_IC_INTR_MASK         0x30
  49 #define DW_IC_RAW_INTR_STAT     0x34
  50 #define DW_IC_RX_TL             0x38
  51 #define DW_IC_TX_TL             0x3c
  52 #define DW_IC_CLR_INTR          0x40
  53 #define DW_IC_CLR_RX_UNDER      0x44
  54 #define DW_IC_CLR_RX_OVER       0x48
  55 #define DW_IC_CLR_TX_OVER       0x4c
  56 #define DW_IC_CLR_RD_REQ        0x50
  57 #define DW_IC_CLR_TX_ABRT       0x54
  58 #define DW_IC_CLR_RX_DONE       0x58
  59 #define DW_IC_CLR_ACTIVITY      0x5c
  60 #define DW_IC_CLR_STOP_DET      0x60
  61 #define DW_IC_CLR_START_DET     0x64
  62 #define DW_IC_CLR_GEN_CALL      0x68
  63 #define DW_IC_ENABLE            0x6c
  64 #define DW_IC_STATUS            0x70
  65 #define DW_IC_TXFLR             0x74
  66 #define DW_IC_RXFLR             0x78
  67 #define DW_IC_SDA_HOLD          0x7c
  68 #define DW_IC_TX_ABRT_SOURCE    0x80
  69 #define DW_IC_ENABLE_STATUS     0x9c
  70 #define DW_IC_CLR_RESTART_DET   0xa8
  71 #define DW_IC_COMP_PARAM_1      0xf4
  72 #define DW_IC_COMP_VERSION      0xf8
  73 #define DW_IC_SDA_HOLD_MIN_VERS 0x3131312A
  74 #define DW_IC_COMP_TYPE         0xfc
  75 #define DW_IC_COMP_TYPE_VALUE   0x44570140
  76
  77 #define DW_IC_INTR_RX_UNDER     0x001
  78 #define DW_IC_INTR_RX_OVER      0x002
  79 #define DW_IC_INTR_RX_FULL      0x004
  80 #define DW_IC_INTR_TX_OVER      0x008
  81 #define DW_IC_INTR_TX_EMPTY     0x010
  82 #define DW_IC_INTR_RD_REQ       0x020
  83 #define DW_IC_INTR_TX_ABRT      0x040
  84 #define DW_IC_INTR_RX_DONE      0x080
  85 #define DW_IC_INTR_ACTIVITY     0x100
  86 #define DW_IC_INTR_STOP_DET     0x200
  87 #define DW_IC_INTR_START_DET    0x400
  88 #define DW_IC_INTR_GEN_CALL     0x800
  89 #define DW_IC_INTR_RESTART_DET  0x1000
  90
  91 #define DW_IC_INTR_DEFAULT_MASK         (DW_IC_INTR_RX_FULL | \
  92                                          DW_IC_INTR_TX_ABRT | \
  93                                          DW_IC_INTR_STOP_DET)
  94 #define DW_IC_INTR_MASTER_MASK          (DW_IC_INTR_DEFAULT_MASK | \
  95                                          DW_IC_INTR_TX_EMPTY)
  96 #define DW_IC_INTR_SLAVE_MASK           (DW_IC_INTR_DEFAULT_MASK | \
  97                                          DW_IC_INTR_RX_DONE | \
  98                                          DW_IC_INTR_RX_UNDER | \
  99                                          DW_IC_INTR_RD_REQ)
 100
 101 #define DW_IC_STATUS_ACTIVITY           0x1
 102 #define DW_IC_STATUS_TFE                BIT(2)
 103 #define DW_IC_STATUS_MASTER_ACTIVITY    BIT(5)
 104 #define DW_IC_STATUS_SLAVE_ACTIVITY     BIT(6)
 105
 106 #define DW_IC_SDA_HOLD_RX_SHIFT         16
 107 #define DW_IC_SDA_HOLD_RX_MASK          GENMASK(23, DW_IC_SDA_HOLD_RX_SHIFT)
 108
 109 #define DW_IC_ERR_TX_ABRT       0x1
 110
 111 #define DW_IC_TAR_10BITADDR_MASTER BIT(12)
 112
 113 #define DW_IC_COMP_PARAM_1_SPEED_MODE_HIGH      (BIT(2) | BIT(3))
 114 #define DW_IC_COMP_PARAM_1_SPEED_MODE_MASK      GENMASK(3, 2)
 115
 116 /*
 117  * status codes
 118  */
 119 #define STATUS_IDLE                     0x0
 120 #define STATUS_WRITE_IN_PROGRESS        0x1
 121 #define STATUS_READ_IN_PROGRESS         0x2
 122
 123 #define TIMEOUT                 20 /* ms */
 124
 125 /*
 126  * operation modes
 127  */
 128 #define DW_IC_MASTER            0
 129 #define DW_IC_SLAVE             1
 130
 131 /*
 132  * Hardware abort codes from the DW_IC_TX_ABRT_SOURCE register
 133  *
 134  * Only expected abort codes are listed here
 135  * refer to the datasheet for the full list
 136  */
 137 #define ABRT_7B_ADDR_NOACK      0
 138 #define ABRT_10ADDR1_NOACK      1
 139 #define ABRT_10ADDR2_NOACK      2
 140 #define ABRT_TXDATA_NOACK       3
 141 #define ABRT_GCALL_NOACK        4
 142 #define ABRT_GCALL_READ         5
 143 #define ABRT_SBYTE_ACKDET       7
 144 #define ABRT_SBYTE_NORSTRT      9
 145 #define ABRT_10B_RD_NORSTRT     10
 146 #define ABRT_MASTER_DIS         11
 147 #define ARB_LOST                12
 148 #define ABRT_SLAVE_FLUSH_TXFIFO 13
 149 #define ABRT_SLAVE_ARBLOST      14
 150 #define ABRT_SLAVE_RD_INTX      15
 151
 152 #define DW_IC_TX_ABRT_7B_ADDR_NOACK     (1UL << ABRT_7B_ADDR_NOACK)
 153 #define DW_IC_TX_ABRT_10ADDR1_NOACK     (1UL << ABRT_10ADDR1_NOACK)
 154 #define DW_IC_TX_ABRT_10ADDR2_NOACK     (1UL << ABRT_10ADDR2_NOACK)
 155 #define DW_IC_TX_ABRT_TXDATA_NOACK      (1UL << ABRT_TXDATA_NOACK)
 156 #define DW_IC_TX_ABRT_GCALL_NOACK       (1UL << ABRT_GCALL_NOACK)
 157 #define DW_IC_TX_ABRT_GCALL_READ        (1UL << ABRT_GCALL_READ)
 158 #define DW_IC_TX_ABRT_SBYTE_ACKDET      (1UL << ABRT_SBYTE_ACKDET)
 159 #define DW_IC_TX_ABRT_SBYTE_NORSTRT     (1UL << ABRT_SBYTE_NORSTRT)
 160 #define DW_IC_TX_ABRT_10B_RD_NORSTRT    (1UL << ABRT_10B_RD_NORSTRT)
 161 #define DW_IC_TX_ABRT_MASTER_DIS        (1UL << ABRT_MASTER_DIS)
 162 #define DW_IC_TX_ARB_LOST               (1UL << ARB_LOST)
 163 #define DW_IC_RX_ABRT_SLAVE_RD_INTX     (1UL << ABRT_SLAVE_RD_INTX)
 164 #define DW_IC_RX_ABRT_SLAVE_ARBLOST     (1UL << ABRT_SLAVE_ARBLOST)
 165 #define DW_IC_RX_ABRT_SLAVE_FLUSH_TXFIFO        (1UL << ABRT_SLAVE_FLUSH_TXFIFO)
 166
 167 #define DW_IC_TX_ABRT_NOACK             (DW_IC_TX_ABRT_7B_ADDR_NOACK | \
 168                                          DW_IC_TX_ABRT_10ADDR1_NOACK | \
 169                                          DW_IC_TX_ABRT_10ADDR2_NOACK | \
 170                                          DW_IC_TX_ABRT_TXDATA_NOACK | \
 171                                          DW_IC_TX_ABRT_GCALL_NOACK)
 172
 173
 174 /**
 175  * struct dw_i2c_dev - private i2c-designware data
 176  * @dev: driver model device node
 177  * @base: IO registers pointer
 178  * @cmd_complete: tx completion indicator
 179  * @clk: input reference clock
 180  * @pclk: clock required to access the registers
 181  * @slave: represent an I2C slave device
 182  * @cmd_err: run time hadware error code
 183  * @msgs: points to an array of messages currently being transferred
 184  * @msgs_num: the number of elements in msgs
 185  * @msg_write_idx: the element index of the current tx message in the msgs
 186  *      array
 187  * @tx_buf_len: the length of the current tx buffer
 188  * @tx_buf: the current tx buffer
 189  * @msg_read_idx: the element index of the current rx message in the msgs
 190  *      array
 191  * @rx_buf_len: the length of the current rx buffer
 192  * @rx_buf: the current rx buffer
 193  * @msg_err: error status of the current transfer
 194  * @status: i2c master status, one of STATUS_*
 195  * @abort_source: copy of the TX_ABRT_SOURCE register
 196  * @irq: interrupt number for the i2c master
 197  * @adapter: i2c subsystem adapter node
 198  * @slave_cfg: configuration for the slave device
 199  * @tx_fifo_depth: depth of the hardware tx fifo
 200  * @rx_fifo_depth: depth of the hardware rx fifo
 201  * @rx_outstanding: current master-rx elements in tx fifo
 202  * @timings: bus clock frequency, SDA hold and other timings
 203  * @sda_hold_time: SDA hold value
 204  * @ss_hcnt: standard speed HCNT value
 205  * @ss_lcnt: standard speed LCNT value
 206  * @fs_hcnt: fast speed HCNT value
 207  * @fs_lcnt: fast speed LCNT value
 208  * @fp_hcnt: fast plus HCNT value
 209  * @fp_lcnt: fast plus LCNT value
 210  * @hs_hcnt: high speed HCNT value
 211  * @hs_lcnt: high speed LCNT value
 212  * @acquire_lock: function to acquire a hardware lock on the bus
 213  * @release_lock: function to release a hardware lock on the bus
 214  * @shared_with_punit: true if this bus is shared with the SoCs PUNIT
 215  * @disable: function to disable the controller
 216  * @disable_int: function to disable all interrupts
 217  * @init: function to initialize the I2C hardware
 218  * @mode: operation mode - DW_IC_MASTER or DW_IC_SLAVE
 219  * @suspended: set to true if the controller is suspended
 220  *
 221  * HCNT and LCNT parameters can be used if the platform knows more accurate
 222  * values than the one computed based only on the input clock frequency.
 223  * Leave them to be %0 if not used.
 224  */
 225 struct dw_i2c_dev {
 226         struct device           *dev;
 227         void __iomem            *base;
 228         void __iomem            *ext;
 229         struct completion       cmd_complete;
 230         struct clk              *clk;
 231         struct clk              *pclk;
 232         struct reset_control    *rst;
 233         struct i2c_client               *slave;
 234         u32                     (*get_clk_rate_khz) (struct dw_i2c_dev *dev);
 235         struct dw_pci_controller *controller;
 236         int                     cmd_err;
 237         struct i2c_msg          *msgs;
 238         int                     msgs_num;
 239         int                     msg_write_idx;
 240         u32                     tx_buf_len;
 241         u8                      *tx_buf;
 242         int                     msg_read_idx;
 243         u32                     rx_buf_len;
 244         u8                      *rx_buf;
 245         int                     msg_err;
 246         unsigned int            status;
 247         u32                     abort_source;
 248         int                     irq;
 249         u32                     flags;
 250         struct i2c_adapter      adapter;
 251         u32                     functionality;
 252         u32                     master_cfg;
 253         u32                     slave_cfg;
 254         unsigned int            tx_fifo_depth;
 255         unsigned int            rx_fifo_depth;
 256         int                     rx_outstanding;
 257         struct i2c_timings      timings;
 258         u32                     sda_hold_time;
 259         u16                     ss_hcnt;
 260         u16                     ss_lcnt;
 261         u16                     fs_hcnt;
 262         u16                     fs_lcnt;
 263         u16                     fp_hcnt;
 264         u16                     fp_lcnt;
 265         u16                     hs_hcnt;
 266         u16                     hs_lcnt;
 267         int                     (*acquire_lock)(void);
 268         void                    (*release_lock)(void);
 269         bool                    shared_with_punit;
 270         void                    (*disable)(struct dw_i2c_dev *dev);
 271         void                    (*disable_int)(struct dw_i2c_dev *dev);
 272         int                     (*init)(struct dw_i2c_dev *dev);
 273         int                     (*set_sda_hold_time)(struct dw_i2c_dev *dev);
 274         int                     mode;
 275         struct i2c_bus_recovery_info rinfo;
 276         bool                    suspended;
 277 };
 278
 279 #define ACCESS_SWAP             0x00000001
 280 #define ACCESS_16BIT            0x00000002
 281 #define ACCESS_INTR_MASK        0x00000004
 282 #define ACCESS_NO_IRQ_SUSPEND   0x00000008
 283
 284 #define MODEL_CHERRYTRAIL       0x00000100
 285 #define MODEL_MSCC_OCELOT       0x00000200
 286 #define MODEL_MASK              0x00000f00
 287
 288 u32 dw_readl(struct dw_i2c_dev *dev, int offset);
 289 void dw_writel(struct dw_i2c_dev *dev, u32 b, int offset);
 290 int i2c_dw_set_reg_access(struct dw_i2c_dev *dev);
 291 u32 i2c_dw_scl_hcnt(u32 ic_clk, u32 tSYMBOL, u32 tf, int cond, int offset);
 292 u32 i2c_dw_scl_lcnt(u32 ic_clk, u32 tLOW, u32 tf, int offset);
 293 int i2c_dw_set_sda_hold(struct dw_i2c_dev *dev);
 294 unsigned long i2c_dw_clk_rate(struct dw_i2c_dev *dev);
 295 int i2c_dw_prepare_clk(struct dw_i2c_dev *dev, bool prepare);
 296 int i2c_dw_acquire_lock(struct dw_i2c_dev *dev);
 297 void i2c_dw_release_lock(struct dw_i2c_dev *dev);
 298 int i2c_dw_wait_bus_not_busy(struct dw_i2c_dev *dev);
 299 int i2c_dw_handle_tx_abort(struct dw_i2c_dev *dev);
 300 u32 i2c_dw_func(struct i2c_adapter *adap);
 301 void i2c_dw_disable(struct dw_i2c_dev *dev);
 302 void i2c_dw_disable_int(struct dw_i2c_dev *dev);
 303
 304 static inline void __i2c_dw_enable(struct dw_i2c_dev *dev)
 305 {
 306         dw_writel(dev, 1, DW_IC_ENABLE);
 307 }
 308
 309 static inline void __i2c_dw_disable_nowait(struct dw_i2c_dev *dev)
 310 {
 311         dw_writel(dev, 0, DW_IC_ENABLE);
 312 }
 313
 314 void __i2c_dw_disable(struct dw_i2c_dev *dev);
 315
 316 extern u32 i2c_dw_read_comp_param(struct dw_i2c_dev *dev);
 317 extern int i2c_dw_probe(struct dw_i2c_dev *dev);
 318 #if IS_ENABLED(CONFIG_I2C_DESIGNWARE_SLAVE)
 319 extern int i2c_dw_probe_slave(struct dw_i2c_dev *dev);
 320 #else
 321 static inline int i2c_dw_probe_slave(struct dw_i2c_dev *dev) { return -EINVAL; }
 322 #endif
 323
 324 #if IS_ENABLED(CONFIG_I2C_DESIGNWARE_BAYTRAIL)
 325 extern int i2c_dw_probe_lock_support(struct dw_i2c_dev *dev);
 326 #else
 327 static inline int i2c_dw_probe_lock_support(struct dw_i2c_dev *dev) { return 0; }
 328 #endif