1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * Driver for ITE Tech Inc. IT8712F/IT8512F CIR
5 * Copyright (C) 2010 Juan Jesús García de Soria <skandalfo@gmail.com>
8 /* platform driver name to register */
9 #define ITE_DRIVER_NAME "ite-cir"
12 #define ITE_TX_FIFO_LEN 32
13 #define ITE_RX_FIFO_LEN 32
16 #define ITE_IRQ_TX_FIFO 1
17 #define ITE_IRQ_RX_FIFO 2
18 #define ITE_IRQ_RX_FIFO_OVERRUN 4
20 /* forward declaration */
23 /* struct for storing the parameters of different recognized devices */
24 struct ite_dev_params {
25 /* model of the device */
28 /* size of the I/O region */
31 /* IR pnp I/O resource number */
34 /* hw-specific operation function pointers; most of these must be
35 * called while holding the spin lock, except for the TX FIFO length
37 /* get pending interrupt causes */
38 int (*get_irq_causes) (struct ite_dev *dev);
41 void (*enable_rx) (struct ite_dev *dev);
43 /* make rx enter the idle state; keep listening for a pulse, but stop
44 * streaming space bytes */
45 void (*idle_rx) (struct ite_dev *dev);
47 /* disable rx completely */
48 void (*disable_rx) (struct ite_dev *dev);
50 /* read bytes from RX FIFO; return read count */
51 int (*get_rx_bytes) (struct ite_dev *dev, u8 *buf, int buf_size);
53 /* enable tx FIFO space available interrupt */
54 void (*enable_tx_interrupt) (struct ite_dev *dev);
56 /* disable tx FIFO space available interrupt */
57 void (*disable_tx_interrupt) (struct ite_dev *dev);
59 /* get number of full TX FIFO slots */
60 int (*get_tx_used_slots) (struct ite_dev *dev);
62 /* put a byte to the TX FIFO */
63 void (*put_tx_byte) (struct ite_dev *dev, u8 value);
65 /* disable hardware completely */
66 void (*disable) (struct ite_dev *dev);
68 /* initialize the hardware */
69 void (*init_hardware) (struct ite_dev *dev);
71 /* set the carrier parameters */
72 void (*set_carrier_params) (struct ite_dev *dev, bool high_freq,
73 bool use_demodulator, u8 carrier_freq_bits,
74 u8 allowance_bits, u8 pulse_width_bits);
77 /* ITE CIR device structure */
86 /* transmit support */
87 wait_queue_head_t tx_queue, tx_ended;
89 /* rx low carrier frequency, in Hz, 0 means no demodulation */
90 unsigned int rx_low_carrier_freq;
92 /* tx high carrier frequency, in Hz, 0 means no demodulation */
93 unsigned int rx_high_carrier_freq;
95 /* tx carrier frequency, in Hz */
96 unsigned int tx_carrier_freq;
98 /* duty cycle, 0-100 */
101 /* hardware I/O settings */
102 unsigned long cir_addr;
105 /* overridable copy of model parameters */
106 const struct ite_dev_params *params;
109 /* common values for all kinds of hardware */
111 /* baud rate divisor default */
112 #define ITE_BAUDRATE_DIVISOR 1
114 /* low-speed carrier frequency limits (Hz) */
115 #define ITE_LCF_MIN_CARRIER_FREQ 27000
116 #define ITE_LCF_MAX_CARRIER_FREQ 58000
118 /* high-speed carrier frequency limits (Hz) */
119 #define ITE_HCF_MIN_CARRIER_FREQ 400000
120 #define ITE_HCF_MAX_CARRIER_FREQ 500000
122 /* default carrier freq for when demodulator is off (Hz) */
123 #define ITE_DEFAULT_CARRIER_FREQ 38000
125 /* convert bits to us */
126 #define ITE_BITS_TO_US(bits, sample_period) \
127 ((u32)((bits) * ITE_BAUDRATE_DIVISOR * (sample_period) / 1000))
130 * n in RDCR produces a tolerance of +/- n * 6.25% around the center
131 * carrier frequency...
133 * From two limit frequencies, L (low) and H (high), we can get both the
134 * center frequency F = (L + H) / 2 and the variation from the center
135 * frequency A = (H - L) / (H + L). We can use this in order to honor the
136 * s_rx_carrier_range() call in ir-core. We'll suppose that any request
137 * setting L=0 means we must shut down the demodulator.
139 #define ITE_RXDCR_PER_10000_STEP 625
141 /* high speed carrier freq values */
142 #define ITE_CFQ_400 0x03
143 #define ITE_CFQ_450 0x08
144 #define ITE_CFQ_480 0x0b
145 #define ITE_CFQ_500 0x0d
147 /* values for pulse widths */
148 #define ITE_TXMPW_A 0x02
149 #define ITE_TXMPW_B 0x03
150 #define ITE_TXMPW_C 0x04
151 #define ITE_TXMPW_D 0x05
152 #define ITE_TXMPW_E 0x06
154 /* values for demodulator carrier range allowance */
155 #define ITE_RXDCR_DEFAULT 0x01 /* default carrier range */
156 #define ITE_RXDCR_MAX 0x07 /* default carrier range */
159 #define ITE_TX_PULSE 0x00
160 #define ITE_TX_SPACE 0x80
161 #define ITE_TX_MAX_RLE 0x80
162 #define ITE_TX_RLE_MASK 0x7f
167 * hardware data obtained from:
170 * Environment Control - Low Pin Count Input / Output
172 * Preliminary Specification V0. 81
175 /* register offsets */
176 #define IT87_DR 0x00 /* data register */
177 #define IT87_IER 0x01 /* interrupt enable register */
178 #define IT87_RCR 0x02 /* receiver control register */
179 #define IT87_TCR1 0x03 /* transmitter control register 1 */
180 #define IT87_TCR2 0x04 /* transmitter control register 2 */
181 #define IT87_TSR 0x05 /* transmitter status register */
182 #define IT87_RSR 0x06 /* receiver status register */
183 #define IT87_BDLR 0x05 /* baud rate divisor low byte register */
184 #define IT87_BDHR 0x06 /* baud rate divisor high byte register */
185 #define IT87_IIR 0x07 /* interrupt identification register */
187 #define IT87_IOREG_LENGTH 0x08 /* length of register file */
190 #define IT87_TLDLIE 0x01 /* transmitter low data interrupt enable */
191 #define IT87_RDAIE 0x02 /* receiver data available interrupt enable */
192 #define IT87_RFOIE 0x04 /* receiver FIFO overrun interrupt enable */
193 #define IT87_IEC 0x08 /* interrupt enable control */
194 #define IT87_BR 0x10 /* baud rate register enable */
195 #define IT87_RESET 0x20 /* reset */
198 #define IT87_RXDCR 0x07 /* receiver demodulation carrier range mask */
199 #define IT87_RXACT 0x08 /* receiver active */
200 #define IT87_RXEND 0x10 /* receiver demodulation enable */
201 #define IT87_RXEN 0x20 /* receiver enable */
202 #define IT87_HCFS 0x40 /* high-speed carrier frequency select */
203 #define IT87_RDWOS 0x80 /* receiver data without sync */
206 #define IT87_TXMPM 0x03 /* transmitter modulation pulse mode mask */
207 #define IT87_TXMPM_DEFAULT 0x00 /* modulation pulse mode default */
208 #define IT87_TXENDF 0x04 /* transmitter deferral */
209 #define IT87_TXRLE 0x08 /* transmitter run length enable */
210 #define IT87_FIFOTL 0x30 /* FIFO level threshold mask */
211 #define IT87_FIFOTL_DEFAULT 0x20 /* FIFO level threshold default
212 * 0x00 -> 1, 0x10 -> 7, 0x20 -> 17,
214 #define IT87_ILE 0x40 /* internal loopback enable */
215 #define IT87_FIFOCLR 0x80 /* FIFO clear bit */
218 #define IT87_TXMPW 0x07 /* transmitter modulation pulse width mask */
219 #define IT87_TXMPW_DEFAULT 0x04 /* default modulation pulse width */
220 #define IT87_CFQ 0xf8 /* carrier frequency mask */
221 #define IT87_CFQ_SHIFT 3 /* carrier frequency bit shift */
224 #define IT87_TXFBC 0x3f /* transmitter FIFO byte count mask */
227 #define IT87_RXFBC 0x3f /* receiver FIFO byte count mask */
228 #define IT87_RXFTO 0x80 /* receiver FIFO time-out */
231 #define IT87_IP 0x01 /* interrupt pending */
232 #define IT87_II 0x06 /* interrupt identification mask */
233 #define IT87_II_NOINT 0x00 /* no interrupt */
234 #define IT87_II_TXLDL 0x02 /* transmitter low data level */
235 #define IT87_II_RXDS 0x04 /* receiver data stored */
236 #define IT87_II_RXFO 0x06 /* receiver FIFO overrun */
241 * Hardware data obtained from:
244 * Embedded Controller
245 * Preliminary Specification V0.4.1
247 * Note that the CIR registers are not directly available to the host, because
248 * they only are accessible to the integrated microcontroller. Thus, in order
249 * use it, some kind of bridging is required. As the bridging may depend on
250 * the controller firmware in use, we are going to use the PNP ID in order to
251 * determine the strategy and ports available. See after these generic
252 * IT8512E/F register definitions for register definitions for those
256 /* register offsets */
257 #define IT85_C0DR 0x00 /* data register */
258 #define IT85_C0MSTCR 0x01 /* master control register */
259 #define IT85_C0IER 0x02 /* interrupt enable register */
260 #define IT85_C0IIR 0x03 /* interrupt identification register */
261 #define IT85_C0CFR 0x04 /* carrier frequency register */
262 #define IT85_C0RCR 0x05 /* receiver control register */
263 #define IT85_C0TCR 0x06 /* transmitter control register */
264 #define IT85_C0SCK 0x07 /* slow clock control register */
265 #define IT85_C0BDLR 0x08 /* baud rate divisor low byte register */
266 #define IT85_C0BDHR 0x09 /* baud rate divisor high byte register */
267 #define IT85_C0TFSR 0x0a /* transmitter FIFO status register */
268 #define IT85_C0RFSR 0x0b /* receiver FIFO status register */
269 #define IT85_C0WCL 0x0d /* wakeup code length register */
270 #define IT85_C0WCR 0x0e /* wakeup code read/write register */
271 #define IT85_C0WPS 0x0f /* wakeup power control/status register */
273 #define IT85_IOREG_LENGTH 0x10 /* length of register file */
276 #define IT85_RESET 0x01 /* reset */
277 #define IT85_FIFOCLR 0x02 /* FIFO clear bit */
278 #define IT85_FIFOTL 0x0c /* FIFO level threshold mask */
279 #define IT85_FIFOTL_DEFAULT 0x08 /* FIFO level threshold default
280 * 0x00 -> 1, 0x04 -> 7, 0x08 -> 17,
282 #define IT85_ILE 0x10 /* internal loopback enable */
283 #define IT85_ILSEL 0x20 /* internal loopback select */
286 #define IT85_TLDLIE 0x01 /* TX low data level interrupt enable */
287 #define IT85_RDAIE 0x02 /* RX data available interrupt enable */
288 #define IT85_RFOIE 0x04 /* RX FIFO overrun interrupt enable */
289 #define IT85_IEC 0x80 /* interrupt enable function control */
292 #define IT85_TLDLI 0x01 /* transmitter low data level interrupt */
293 #define IT85_RDAI 0x02 /* receiver data available interrupt */
294 #define IT85_RFOI 0x04 /* receiver FIFO overrun interrupt */
295 #define IT85_NIP 0x80 /* no interrupt pending */
298 #define IT85_CFQ 0x1f /* carrier frequency mask */
299 #define IT85_HCFS 0x20 /* high speed carrier frequency select */
302 #define IT85_RXDCR 0x07 /* receiver demodulation carrier range mask */
303 #define IT85_RXACT 0x08 /* receiver active */
304 #define IT85_RXEND 0x10 /* receiver demodulation enable */
305 #define IT85_RDWOS 0x20 /* receiver data without sync */
306 #define IT85_RXEN 0x80 /* receiver enable */
309 #define IT85_TXMPW 0x07 /* transmitter modulation pulse width mask */
310 #define IT85_TXMPW_DEFAULT 0x04 /* default modulation pulse width */
311 #define IT85_TXMPM 0x18 /* transmitter modulation pulse mode mask */
312 #define IT85_TXMPM_DEFAULT 0x00 /* modulation pulse mode default */
313 #define IT85_TXENDF 0x20 /* transmitter deferral */
314 #define IT85_TXRLE 0x40 /* transmitter run length enable */
317 #define IT85_SCKS 0x01 /* slow clock select */
318 #define IT85_TXDCKG 0x02 /* TXD clock gating */
319 #define IT85_DLL1P8E 0x04 /* DLL 1.8432M enable */
320 #define IT85_DLLTE 0x08 /* DLL test enable */
321 #define IT85_BRCM 0x70 /* baud rate count mode */
322 #define IT85_DLLOCK 0x80 /* DLL lock */
325 #define IT85_TXFBC 0x3f /* transmitter FIFO count mask */
328 #define IT85_RXFBC 0x3f /* receiver FIFO count mask */
329 #define IT85_RXFTO 0x80 /* receiver FIFO time-out */
332 #define IT85_WCL 0x3f /* wakeup code length mask */
335 #define IT85_CIRPOSIE 0x01 /* power on/off status interrupt enable */
336 #define IT85_CIRPOIS 0x02 /* power on/off interrupt status */
337 #define IT85_CIRPOII 0x04 /* power on/off interrupt identification */
338 #define IT85_RCRST 0x10 /* wakeup code reading counter reset bit */
339 #define IT85_WCRST 0x20 /* wakeup code writing counter reset bit */
344 * Hardware data obtained from hacked driver for IT8512 in this forum post:
346 * http://ubuntuforums.org/showthread.php?t=1028640
348 * Although there's no official documentation for that driver, analysis would
349 * suggest that it maps the 16 registers of IT8512 onto two 8-register banks,
350 * selectable by a single bank-select bit that's mapped onto both banks. The
351 * IT8512 registers are mapped in a different order, so that the first bank
352 * maps the ones that are used more often, and two registers that share a
353 * reserved high-order bit are placed at the same offset in both banks in
354 * order to reuse the reserved bit as the bank select bit.
357 /* register offsets */
359 /* mapped onto both banks */
360 #define IT8708_BANKSEL 0x07 /* bank select register */
361 #define IT8708_HRAE 0x80 /* high registers access enable */
363 /* mapped onto the low bank */
364 #define IT8708_C0DR 0x00 /* data register */
365 #define IT8708_C0MSTCR 0x01 /* master control register */
366 #define IT8708_C0IER 0x02 /* interrupt enable register */
367 #define IT8708_C0IIR 0x03 /* interrupt identification register */
368 #define IT8708_C0RFSR 0x04 /* receiver FIFO status register */
369 #define IT8708_C0RCR 0x05 /* receiver control register */
370 #define IT8708_C0TFSR 0x06 /* transmitter FIFO status register */
371 #define IT8708_C0TCR 0x07 /* transmitter control register */
373 /* mapped onto the high bank */
374 #define IT8708_C0BDLR 0x01 /* baud rate divisor low byte register */
375 #define IT8708_C0BDHR 0x02 /* baud rate divisor high byte register */
376 #define IT8708_C0CFR 0x04 /* carrier frequency register */
378 /* registers whose bank mapping we don't know, since they weren't being used
379 * in the hacked driver... most probably they belong to the high bank too,
380 * since they fit in the holes the other registers leave */
381 #define IT8708_C0SCK 0x03 /* slow clock control register */
382 #define IT8708_C0WCL 0x05 /* wakeup code length register */
383 #define IT8708_C0WCR 0x06 /* wakeup code read/write register */
384 #define IT8708_C0WPS 0x07 /* wakeup power control/status register */
386 #define IT8708_IOREG_LENGTH 0x08 /* length of register file */
388 /* two more registers that are defined in the hacked driver, but can't be
389 * found in the data sheets; no idea what they are or how they are accessed,
390 * since the hacked driver doesn't seem to use them */
391 #define IT8708_CSCRR 0x00
392 #define IT8708_CGPINTR 0x01
395 #define IT8708_CSCRR_SCRB 0x3f
396 #define IT8708_CSCRR_PM 0x80
399 #define IT8708_CGPINT 0x01
404 * Hardware interfacing data obtained from the original lirc_ite8709 driver.
405 * Verbatim from its sources:
407 * The ITE8709 device seems to be the combination of IT8512 superIO chip and
408 * a specific firmware running on the IT8512's embedded micro-controller.
409 * In addition of the embedded micro-controller, the IT8512 chip contains a
410 * CIR module and several other modules. A few modules are directly accessible
411 * by the host CPU, but most of them are only accessible by the
412 * micro-controller. The CIR module is only accessible by the
415 * The battery-backed SRAM module is accessible by the host CPU and the
416 * micro-controller. So one of the MC's firmware role is to act as a bridge
417 * between the host CPU and the CIR module. The firmware implements a kind of
418 * communication protocol using the SRAM module as a shared memory. The IT8512
419 * specification is publicly available on ITE's web site, but the
420 * communication protocol is not, so it was reverse-engineered.
423 /* register offsets */
424 #define IT8709_RAM_IDX 0x00 /* index into the SRAM module bytes */
425 #define IT8709_RAM_VAL 0x01 /* read/write data to the indexed byte */
427 #define IT8709_IOREG_LENGTH 0x02 /* length of register file */
429 /* register offsets inside the SRAM module */
430 #define IT8709_MODE 0x1a /* request/ack byte */
431 #define IT8709_REG_IDX 0x1b /* index of the CIR register to access */
432 #define IT8709_REG_VAL 0x1c /* value read/to be written */
433 #define IT8709_IIR 0x1e /* interrupt identification register */
434 #define IT8709_RFSR 0x1f /* receiver FIFO status register */
435 #define IT8709_FIFO 0x20 /* start of in RAM RX FIFO copy */
438 #define IT8709_IDLE 0x00
439 #define IT8709_WRITE 0x01
440 #define IT8709_READ 0x02