drivers/media/rc/ite-cir.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * Driver for ITE Tech Inc. IT8712F/IT8512F CIR
   4  *
   5  * Copyright (C) 2010 Juan Jesús García de Soria <skandalfo@gmail.com>
   6  */
   7
   8 /* platform driver name to register */
   9 #define ITE_DRIVER_NAME "ite-cir"
  10
  11 /* logging macros */
  12 #define ite_pr(level, text, ...) \
  13         printk(level KBUILD_MODNAME ": " text, ## __VA_ARGS__)
  14 #define ite_dbg(text, ...) do { \
  15         if (debug) \
  16                 printk(KERN_DEBUG \
  17                         KBUILD_MODNAME ": " text "\n" , ## __VA_ARGS__); \
  18 } while (0)
  19
  20 #define ite_dbg_verbose(text, ...) do {\
  21         if (debug > 1) \
  22                 printk(KERN_DEBUG \
  23                         KBUILD_MODNAME ": " text "\n" , ## __VA_ARGS__); \
  24 } while (0)
  25
  26 /* FIFO sizes */
  27 #define ITE_TX_FIFO_LEN 32
  28 #define ITE_RX_FIFO_LEN 32
  29
  30 /* interrupt types */
  31 #define ITE_IRQ_TX_FIFO        1
  32 #define ITE_IRQ_RX_FIFO        2
  33 #define ITE_IRQ_RX_FIFO_OVERRUN    4
  34
  35 /* forward declaration */
  36 struct ite_dev;
  37
  38 /* struct for storing the parameters of different recognized devices */
  39 struct ite_dev_params {
  40         /* model of the device */
  41         const char *model;
  42
  43         /* size of the I/O region */
  44         int io_region_size;
  45
  46         /* IR pnp I/O resource number */
  47         int io_rsrc_no;
  48
  49         /* true if the hardware supports transmission */
  50         bool hw_tx_capable;
  51
  52         /* base sampling period, in ns */
  53         u32 sample_period;
  54
  55         /* rx low carrier frequency, in Hz, 0 means no demodulation */
  56         unsigned int rx_low_carrier_freq;
  57
  58         /* tx high carrier frequency, in Hz, 0 means no demodulation */
  59         unsigned int rx_high_carrier_freq;
  60
  61         /* tx carrier frequency, in Hz */
  62         unsigned int tx_carrier_freq;
  63
  64         /* duty cycle, 0-100 */
  65         int tx_duty_cycle;
  66
  67         /* hw-specific operation function pointers; most of these must be
  68          * called while holding the spin lock, except for the TX FIFO length
  69          * one */
  70         /* get pending interrupt causes */
  71         int (*get_irq_causes) (struct ite_dev *dev);
  72
  73         /* enable rx */
  74         void (*enable_rx) (struct ite_dev *dev);
  75
  76         /* make rx enter the idle state; keep listening for a pulse, but stop
  77          * streaming space bytes */
  78         void (*idle_rx) (struct ite_dev *dev);
  79
  80         /* disable rx completely */
  81         void (*disable_rx) (struct ite_dev *dev);
  82
  83         /* read bytes from RX FIFO; return read count */
  84         int (*get_rx_bytes) (struct ite_dev *dev, u8 *buf, int buf_size);
  85
  86         /* enable tx FIFO space available interrupt */
  87         void (*enable_tx_interrupt) (struct ite_dev *dev);
  88
  89         /* disable tx FIFO space available interrupt */
  90         void (*disable_tx_interrupt) (struct ite_dev *dev);
  91
  92         /* get number of full TX FIFO slots */
  93         int (*get_tx_used_slots) (struct ite_dev *dev);
  94
  95         /* put a byte to the TX FIFO */
  96         void (*put_tx_byte) (struct ite_dev *dev, u8 value);
  97
  98         /* disable hardware completely */
  99         void (*disable) (struct ite_dev *dev);
 100
 101         /* initialize the hardware */
 102         void (*init_hardware) (struct ite_dev *dev);
 103
 104         /* set the carrier parameters */
 105         void (*set_carrier_params) (struct ite_dev *dev, bool high_freq,
 106                                     bool use_demodulator, u8 carrier_freq_bits,
 107                                     u8 allowance_bits, u8 pulse_width_bits);
 108 };
 109
 110 /* ITE CIR device structure */
 111 struct ite_dev {
 112         struct pnp_dev *pdev;
 113         struct rc_dev *rdev;
 114         struct ir_raw_event rawir;
 115
 116         /* sync data */
 117         spinlock_t lock;
 118         bool in_use, transmitting;
 119
 120         /* transmit support */
 121         int tx_fifo_allowance;
 122         wait_queue_head_t tx_queue, tx_ended;
 123
 124         /* hardware I/O settings */
 125         unsigned long cir_addr;
 126         int cir_irq;
 127
 128         /* overridable copy of model parameters */
 129         struct ite_dev_params params;
 130 };
 131
 132 /* common values for all kinds of hardware */
 133
 134 /* baud rate divisor default */
 135 #define ITE_BAUDRATE_DIVISOR            1
 136
 137 /* low-speed carrier frequency limits (Hz) */
 138 #define ITE_LCF_MIN_CARRIER_FREQ        27000
 139 #define ITE_LCF_MAX_CARRIER_FREQ        58000
 140
 141 /* high-speed carrier frequency limits (Hz) */
 142 #define ITE_HCF_MIN_CARRIER_FREQ        400000
 143 #define ITE_HCF_MAX_CARRIER_FREQ        500000
 144
 145 /* default carrier freq for when demodulator is off (Hz) */
 146 #define ITE_DEFAULT_CARRIER_FREQ        38000
 147
 148 /* convert bits to us */
 149 #define ITE_BITS_TO_NS(bits, sample_period) \
 150 ((u32) ((bits) * ITE_BAUDRATE_DIVISOR * sample_period))
 151
 152 /*
 153  * n in RDCR produces a tolerance of +/- n * 6.25% around the center
 154  * carrier frequency...
 155  *
 156  * From two limit frequencies, L (low) and H (high), we can get both the
 157  * center frequency F = (L + H) / 2 and the variation from the center
 158  * frequency A = (H - L) / (H + L). We can use this in order to honor the
 159  * s_rx_carrier_range() call in ir-core. We'll suppose that any request
 160  * setting L=0 means we must shut down the demodulator.
 161  */
 162 #define ITE_RXDCR_PER_10000_STEP 625
 163
 164 /* high speed carrier freq values */
 165 #define ITE_CFQ_400             0x03
 166 #define ITE_CFQ_450             0x08
 167 #define ITE_CFQ_480             0x0b
 168 #define ITE_CFQ_500             0x0d
 169
 170 /* values for pulse widths */
 171 #define ITE_TXMPW_A             0x02
 172 #define ITE_TXMPW_B             0x03
 173 #define ITE_TXMPW_C             0x04
 174 #define ITE_TXMPW_D             0x05
 175 #define ITE_TXMPW_E             0x06
 176
 177 /* values for demodulator carrier range allowance */
 178 #define ITE_RXDCR_DEFAULT       0x01    /* default carrier range */
 179 #define ITE_RXDCR_MAX           0x07    /* default carrier range */
 180
 181 /* DR TX bits */
 182 #define ITE_TX_PULSE            0x00
 183 #define ITE_TX_SPACE            0x80
 184 #define ITE_TX_MAX_RLE          0x80
 185 #define ITE_TX_RLE_MASK         0x7f
 186
 187 /*
 188  * IT8712F
 189  *
 190  * hardware data obtained from:
 191  *
 192  * IT8712F
 193  * Environment Control – Low Pin Count Input / Output
 194  * (EC - LPC I/O)
 195  * Preliminary Specification V0. 81
 196  */
 197
 198 /* register offsets */
 199 #define IT87_DR         0x00    /* data register */
 200 #define IT87_IER        0x01    /* interrupt enable register */
 201 #define IT87_RCR        0x02    /* receiver control register */
 202 #define IT87_TCR1       0x03    /* transmitter control register 1 */
 203 #define IT87_TCR2       0x04    /* transmitter control register 2 */
 204 #define IT87_TSR        0x05    /* transmitter status register */
 205 #define IT87_RSR        0x06    /* receiver status register */
 206 #define IT87_BDLR       0x05    /* baud rate divisor low byte register */
 207 #define IT87_BDHR       0x06    /* baud rate divisor high byte register */
 208 #define IT87_IIR        0x07    /* interrupt identification register */
 209
 210 #define IT87_IOREG_LENGTH 0x08  /* length of register file */
 211
 212 /* IER bits */
 213 #define IT87_TLDLIE     0x01    /* transmitter low data interrupt enable */
 214 #define IT87_RDAIE      0x02    /* receiver data available interrupt enable */
 215 #define IT87_RFOIE      0x04    /* receiver FIFO overrun interrupt enable */
 216 #define IT87_IEC        0x08    /* interrupt enable control */
 217 #define IT87_BR         0x10    /* baud rate register enable */
 218 #define IT87_RESET      0x20    /* reset */
 219
 220 /* RCR bits */
 221 #define IT87_RXDCR      0x07    /* receiver demodulation carrier range mask */
 222 #define IT87_RXACT      0x08    /* receiver active */
 223 #define IT87_RXEND      0x10    /* receiver demodulation enable */
 224 #define IT87_RXEN       0x20    /* receiver enable */
 225 #define IT87_HCFS       0x40    /* high-speed carrier frequency select */
 226 #define IT87_RDWOS      0x80    /* receiver data without sync */
 227
 228 /* TCR1 bits */
 229 #define IT87_TXMPM      0x03    /* transmitter modulation pulse mode mask */
 230 #define IT87_TXMPM_DEFAULT 0x00 /* modulation pulse mode default */
 231 #define IT87_TXENDF     0x04    /* transmitter deferral */
 232 #define IT87_TXRLE      0x08    /* transmitter run length enable */
 233 #define IT87_FIFOTL     0x30    /* FIFO level threshold mask */
 234 #define IT87_FIFOTL_DEFAULT 0x20        /* FIFO level threshold default
 235                                          * 0x00 -> 1, 0x10 -> 7, 0x20 -> 17,
 236                                          * 0x30 -> 25 */
 237 #define IT87_ILE        0x40    /* internal loopback enable */
 238 #define IT87_FIFOCLR    0x80    /* FIFO clear bit */
 239
 240 /* TCR2 bits */
 241 #define IT87_TXMPW      0x07    /* transmitter modulation pulse width mask */
 242 #define IT87_TXMPW_DEFAULT 0x04 /* default modulation pulse width */
 243 #define IT87_CFQ        0xf8    /* carrier frequency mask */
 244 #define IT87_CFQ_SHIFT  3       /* carrier frequency bit shift */
 245
 246 /* TSR bits */
 247 #define IT87_TXFBC      0x3f    /* transmitter FIFO byte count mask */
 248
 249 /* RSR bits */
 250 #define IT87_RXFBC      0x3f    /* receiver FIFO byte count mask */
 251 #define IT87_RXFTO      0x80    /* receiver FIFO time-out */
 252
 253 /* IIR bits */
 254 #define IT87_IP         0x01    /* interrupt pending */
 255 #define IT87_II         0x06    /* interrupt identification mask */
 256 #define IT87_II_NOINT   0x00    /* no interrupt */
 257 #define IT87_II_TXLDL   0x02    /* transmitter low data level */
 258 #define IT87_II_RXDS    0x04    /* receiver data stored */
 259 #define IT87_II_RXFO    0x06    /* receiver FIFO overrun */
 260
 261 /*
 262  * IT8512E/F
 263  *
 264  * Hardware data obtained from:
 265  *
 266  * IT8512E/F
 267  * Embedded Controller
 268  * Preliminary Specification V0.4.1
 269  *
 270  * Note that the CIR registers are not directly available to the host, because
 271  * they only are accessible to the integrated microcontroller. Thus, in order
 272  * use it, some kind of bridging is required. As the bridging may depend on
 273  * the controller firmware in use, we are going to use the PNP ID in order to
 274  * determine the strategy and ports available. See after these generic
 275  * IT8512E/F register definitions for register definitions for those
 276  * strategies.
 277  */
 278
 279 /* register offsets */
 280 #define IT85_C0DR       0x00    /* data register */
 281 #define IT85_C0MSTCR    0x01    /* master control register */
 282 #define IT85_C0IER      0x02    /* interrupt enable register */
 283 #define IT85_C0IIR      0x03    /* interrupt identification register */
 284 #define IT85_C0CFR      0x04    /* carrier frequency register */
 285 #define IT85_C0RCR      0x05    /* receiver control register */
 286 #define IT85_C0TCR      0x06    /* transmitter control register */
 287 #define IT85_C0SCK      0x07    /* slow clock control register */
 288 #define IT85_C0BDLR     0x08    /* baud rate divisor low byte register */
 289 #define IT85_C0BDHR     0x09    /* baud rate divisor high byte register */
 290 #define IT85_C0TFSR     0x0a    /* transmitter FIFO status register */
 291 #define IT85_C0RFSR     0x0b    /* receiver FIFO status register */
 292 #define IT85_C0WCL      0x0d    /* wakeup code length register */
 293 #define IT85_C0WCR      0x0e    /* wakeup code read/write register */
 294 #define IT85_C0WPS      0x0f    /* wakeup power control/status register */
 295
 296 #define IT85_IOREG_LENGTH 0x10  /* length of register file */
 297
 298 /* C0MSTCR bits */
 299 #define IT85_RESET      0x01    /* reset */
 300 #define IT85_FIFOCLR    0x02    /* FIFO clear bit */
 301 #define IT85_FIFOTL     0x0c    /* FIFO level threshold mask */
 302 #define IT85_FIFOTL_DEFAULT 0x08        /* FIFO level threshold default
 303                                          * 0x00 -> 1, 0x04 -> 7, 0x08 -> 17,
 304                                          * 0x0c -> 25 */
 305 #define IT85_ILE        0x10    /* internal loopback enable */
 306 #define IT85_ILSEL      0x20    /* internal loopback select */
 307
 308 /* C0IER bits */
 309 #define IT85_TLDLIE     0x01    /* TX low data level interrupt enable */
 310 #define IT85_RDAIE      0x02    /* RX data available interrupt enable */
 311 #define IT85_RFOIE      0x04    /* RX FIFO overrun interrupt enable */
 312 #define IT85_IEC        0x80    /* interrupt enable function control */
 313
 314 /* C0IIR bits */
 315 #define IT85_TLDLI      0x01    /* transmitter low data level interrupt */
 316 #define IT85_RDAI       0x02    /* receiver data available interrupt */
 317 #define IT85_RFOI       0x04    /* receiver FIFO overrun interrupt */
 318 #define IT85_NIP        0x80    /* no interrupt pending */
 319
 320 /* C0CFR bits */
 321 #define IT85_CFQ        0x1f    /* carrier frequency mask */
 322 #define IT85_HCFS       0x20    /* high speed carrier frequency select */
 323
 324 /* C0RCR bits */
 325 #define IT85_RXDCR      0x07    /* receiver demodulation carrier range mask */
 326 #define IT85_RXACT      0x08    /* receiver active */
 327 #define IT85_RXEND      0x10    /* receiver demodulation enable */
 328 #define IT85_RDWOS      0x20    /* receiver data without sync */
 329 #define IT85_RXEN       0x80    /* receiver enable */
 330
 331 /* C0TCR bits */
 332 #define IT85_TXMPW      0x07    /* transmitter modulation pulse width mask */
 333 #define IT85_TXMPW_DEFAULT 0x04 /* default modulation pulse width */
 334 #define IT85_TXMPM      0x18    /* transmitter modulation pulse mode mask */
 335 #define IT85_TXMPM_DEFAULT 0x00 /* modulation pulse mode default */
 336 #define IT85_TXENDF     0x20    /* transmitter deferral */
 337 #define IT85_TXRLE      0x40    /* transmitter run length enable */
 338
 339 /* C0SCK bits */
 340 #define IT85_SCKS       0x01    /* slow clock select */
 341 #define IT85_TXDCKG     0x02    /* TXD clock gating */
 342 #define IT85_DLL1P8E    0x04    /* DLL 1.8432M enable */
 343 #define IT85_DLLTE      0x08    /* DLL test enable */
 344 #define IT85_BRCM       0x70    /* baud rate count mode */
 345 #define IT85_DLLOCK     0x80    /* DLL lock */
 346
 347 /* C0TFSR bits */
 348 #define IT85_TXFBC      0x3f    /* transmitter FIFO count mask */
 349
 350 /* C0RFSR bits */
 351 #define IT85_RXFBC      0x3f    /* receiver FIFO count mask */
 352 #define IT85_RXFTO      0x80    /* receiver FIFO time-out */
 353
 354 /* C0WCL bits */
 355 #define IT85_WCL        0x3f    /* wakeup code length mask */
 356
 357 /* C0WPS bits */
 358 #define IT85_CIRPOSIE   0x01    /* power on/off status interrupt enable */
 359 #define IT85_CIRPOIS    0x02    /* power on/off interrupt status */
 360 #define IT85_CIRPOII    0x04    /* power on/off interrupt identification */
 361 #define IT85_RCRST      0x10    /* wakeup code reading counter reset bit */
 362 #define IT85_WCRST      0x20    /* wakeup code writing counter reset bit */
 363
 364 /*
 365  * ITE8708
 366  *
 367  * Hardware data obtained from hacked driver for IT8512 in this forum post:
 368  *
 369  *  http://ubuntuforums.org/showthread.php?t=1028640
 370  *
 371  * Although there's no official documentation for that driver, analysis would
 372  * suggest that it maps the 16 registers of IT8512 onto two 8-register banks,
 373  * selectable by a single bank-select bit that's mapped onto both banks. The
 374  * IT8512 registers are mapped in a different order, so that the first bank
 375  * maps the ones that are used more often, and two registers that share a
 376  * reserved high-order bit are placed at the same offset in both banks in
 377  * order to reuse the reserved bit as the bank select bit.
 378  */
 379
 380 /* register offsets */
 381
 382 /* mapped onto both banks */
 383 #define IT8708_BANKSEL  0x07    /* bank select register */
 384 #define IT8708_HRAE     0x80    /* high registers access enable */
 385
 386 /* mapped onto the low bank */
 387 #define IT8708_C0DR     0x00    /* data register */
 388 #define IT8708_C0MSTCR  0x01    /* master control register */
 389 #define IT8708_C0IER    0x02    /* interrupt enable register */
 390 #define IT8708_C0IIR    0x03    /* interrupt identification register */
 391 #define IT8708_C0RFSR   0x04    /* receiver FIFO status register */
 392 #define IT8708_C0RCR    0x05    /* receiver control register */
 393 #define IT8708_C0TFSR   0x06    /* transmitter FIFO status register */
 394 #define IT8708_C0TCR    0x07    /* transmitter control register */
 395
 396 /* mapped onto the high bank */
 397 #define IT8708_C0BDLR   0x01    /* baud rate divisor low byte register */
 398 #define IT8708_C0BDHR   0x02    /* baud rate divisor high byte register */
 399 #define IT8708_C0CFR    0x04    /* carrier frequency register */
 400
 401 /* registers whose bank mapping we don't know, since they weren't being used
 402  * in the hacked driver... most probably they belong to the high bank too,
 403  * since they fit in the holes the other registers leave */
 404 #define IT8708_C0SCK    0x03    /* slow clock control register */
 405 #define IT8708_C0WCL    0x05    /* wakeup code length register */
 406 #define IT8708_C0WCR    0x06    /* wakeup code read/write register */
 407 #define IT8708_C0WPS    0x07    /* wakeup power control/status register */
 408
 409 #define IT8708_IOREG_LENGTH 0x08        /* length of register file */
 410
 411 /* two more registers that are defined in the hacked driver, but can't be
 412  * found in the data sheets; no idea what they are or how they are accessed,
 413  * since the hacked driver doesn't seem to use them */
 414 #define IT8708_CSCRR    0x00
 415 #define IT8708_CGPINTR  0x01
 416
 417 /* CSCRR bits */
 418 #define IT8708_CSCRR_SCRB 0x3f
 419 #define IT8708_CSCRR_PM 0x80
 420
 421 /* CGPINTR bits */
 422 #define IT8708_CGPINT   0x01
 423
 424 /*
 425  * ITE8709
 426  *
 427  * Hardware interfacing data obtained from the original lirc_ite8709 driver.
 428  * Verbatim from its sources:
 429  *
 430  * The ITE8709 device seems to be the combination of IT8512 superIO chip and
 431  * a specific firmware running on the IT8512's embedded micro-controller.
 432  * In addition of the embedded micro-controller, the IT8512 chip contains a
 433  * CIR module and several other modules. A few modules are directly accessible
 434  * by the host CPU, but most of them are only accessible by the
 435  * micro-controller. The CIR module is only accessible by the
 436  * micro-controller.
 437  *
 438  * The battery-backed SRAM module is accessible by the host CPU and the
 439  * micro-controller. So one of the MC's firmware role is to act as a bridge
 440  * between the host CPU and the CIR module. The firmware implements a kind of
 441  * communication protocol using the SRAM module as a shared memory. The IT8512
 442  * specification is publicly available on ITE's web site, but the
 443  * communication protocol is not, so it was reverse-engineered.
 444  */
 445
 446 /* register offsets */
 447 #define IT8709_RAM_IDX  0x00    /* index into the SRAM module bytes */
 448 #define IT8709_RAM_VAL  0x01    /* read/write data to the indexed byte */
 449
 450 #define IT8709_IOREG_LENGTH 0x02        /* length of register file */
 451
 452 /* register offsets inside the SRAM module */
 453 #define IT8709_MODE     0x1a    /* request/ack byte */
 454 #define IT8709_REG_IDX  0x1b    /* index of the CIR register to access */
 455 #define IT8709_REG_VAL  0x1c    /* value read/to be written */
 456 #define IT8709_IIR      0x1e    /* interrupt identification register */
 457 #define IT8709_RFSR     0x1f    /* receiver FIFO status register */
 458 #define IT8709_FIFO     0x20    /* start of in RAM RX FIFO copy */
 459
 460 /* MODE values */
 461 #define IT8709_IDLE     0x00
 462 #define IT8709_WRITE    0x01
 463 #define IT8709_READ     0x02