2 * SC16IS7xx tty serial driver - Copyright (C) 2014 GridPoint
3 * Author: Jon Ringle <jringle@gridpoint.com>
5 * Based on max310x.c, by Alexander Shiyan <shc_work@mail.ru>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
14 #include <linux/bitops.h>
15 #include <linux/clk.h>
16 #include <linux/delay.h>
17 #include <linux/device.h>
18 #include <linux/gpio.h>
19 #include <linux/i2c.h>
20 #include <linux/module.h>
22 #include <linux/of_device.h>
23 #include <linux/regmap.h>
24 #include <linux/serial_core.h>
25 #include <linux/serial.h>
26 #include <linux/tty.h>
27 #include <linux/tty_flip.h>
28 #include <linux/spi/spi.h>
29 #include <linux/uaccess.h>
31 #define SC16IS7XX_NAME "sc16is7xx"
33 /* SC16IS7XX register definitions */
34 #define SC16IS7XX_RHR_REG (0x00) /* RX FIFO */
35 #define SC16IS7XX_THR_REG (0x00) /* TX FIFO */
36 #define SC16IS7XX_IER_REG (0x01) /* Interrupt enable */
37 #define SC16IS7XX_IIR_REG (0x02) /* Interrupt Identification */
38 #define SC16IS7XX_FCR_REG (0x02) /* FIFO control */
39 #define SC16IS7XX_LCR_REG (0x03) /* Line Control */
40 #define SC16IS7XX_MCR_REG (0x04) /* Modem Control */
41 #define SC16IS7XX_LSR_REG (0x05) /* Line Status */
42 #define SC16IS7XX_MSR_REG (0x06) /* Modem Status */
43 #define SC16IS7XX_SPR_REG (0x07) /* Scratch Pad */
44 #define SC16IS7XX_TXLVL_REG (0x08) /* TX FIFO level */
45 #define SC16IS7XX_RXLVL_REG (0x09) /* RX FIFO level */
46 #define SC16IS7XX_IODIR_REG (0x0a) /* I/O Direction
49 #define SC16IS7XX_IOSTATE_REG (0x0b) /* I/O State
52 #define SC16IS7XX_IOINTENA_REG (0x0c) /* I/O Interrupt Enable
55 #define SC16IS7XX_IOCONTROL_REG (0x0e) /* I/O Control
58 #define SC16IS7XX_EFCR_REG (0x0f) /* Extra Features Control */
60 /* TCR/TLR Register set: Only if ((MCR[2] == 1) && (EFR[4] == 1)) */
61 #define SC16IS7XX_TCR_REG (0x06) /* Transmit control */
62 #define SC16IS7XX_TLR_REG (0x07) /* Trigger level */
64 /* Special Register set: Only if ((LCR[7] == 1) && (LCR != 0xBF)) */
65 #define SC16IS7XX_DLL_REG (0x00) /* Divisor Latch Low */
66 #define SC16IS7XX_DLH_REG (0x01) /* Divisor Latch High */
68 /* Enhanced Register set: Only if (LCR == 0xBF) */
69 #define SC16IS7XX_EFR_REG (0x02) /* Enhanced Features */
70 #define SC16IS7XX_XON1_REG (0x04) /* Xon1 word */
71 #define SC16IS7XX_XON2_REG (0x05) /* Xon2 word */
72 #define SC16IS7XX_XOFF1_REG (0x06) /* Xoff1 word */
73 #define SC16IS7XX_XOFF2_REG (0x07) /* Xoff2 word */
75 /* IER register bits */
76 #define SC16IS7XX_IER_RDI_BIT (1 << 0) /* Enable RX data interrupt */
77 #define SC16IS7XX_IER_THRI_BIT (1 << 1) /* Enable TX holding register
79 #define SC16IS7XX_IER_RLSI_BIT (1 << 2) /* Enable RX line status
81 #define SC16IS7XX_IER_MSI_BIT (1 << 3) /* Enable Modem status
84 /* IER register bits - write only if (EFR[4] == 1) */
85 #define SC16IS7XX_IER_SLEEP_BIT (1 << 4) /* Enable Sleep mode */
86 #define SC16IS7XX_IER_XOFFI_BIT (1 << 5) /* Enable Xoff interrupt */
87 #define SC16IS7XX_IER_RTSI_BIT (1 << 6) /* Enable nRTS interrupt */
88 #define SC16IS7XX_IER_CTSI_BIT (1 << 7) /* Enable nCTS interrupt */
90 /* FCR register bits */
91 #define SC16IS7XX_FCR_FIFO_BIT (1 << 0) /* Enable FIFO */
92 #define SC16IS7XX_FCR_RXRESET_BIT (1 << 1) /* Reset RX FIFO */
93 #define SC16IS7XX_FCR_TXRESET_BIT (1 << 2) /* Reset TX FIFO */
94 #define SC16IS7XX_FCR_RXLVLL_BIT (1 << 6) /* RX Trigger level LSB */
95 #define SC16IS7XX_FCR_RXLVLH_BIT (1 << 7) /* RX Trigger level MSB */
97 /* FCR register bits - write only if (EFR[4] == 1) */
98 #define SC16IS7XX_FCR_TXLVLL_BIT (1 << 4) /* TX Trigger level LSB */
99 #define SC16IS7XX_FCR_TXLVLH_BIT (1 << 5) /* TX Trigger level MSB */
101 /* IIR register bits */
102 #define SC16IS7XX_IIR_NO_INT_BIT (1 << 0) /* No interrupts pending */
103 #define SC16IS7XX_IIR_ID_MASK 0x3e /* Mask for the interrupt ID */
104 #define SC16IS7XX_IIR_THRI_SRC 0x02 /* TX holding register empty */
105 #define SC16IS7XX_IIR_RDI_SRC 0x04 /* RX data interrupt */
106 #define SC16IS7XX_IIR_RLSE_SRC 0x06 /* RX line status error */
107 #define SC16IS7XX_IIR_RTOI_SRC 0x0c /* RX time-out interrupt */
108 #define SC16IS7XX_IIR_MSI_SRC 0x00 /* Modem status interrupt
111 #define SC16IS7XX_IIR_INPIN_SRC 0x30 /* Input pin change of state
114 #define SC16IS7XX_IIR_XOFFI_SRC 0x10 /* Received Xoff */
115 #define SC16IS7XX_IIR_CTSRTS_SRC 0x20 /* nCTS,nRTS change of state
119 /* LCR register bits */
120 #define SC16IS7XX_LCR_LENGTH0_BIT (1 << 0) /* Word length bit 0 */
121 #define SC16IS7XX_LCR_LENGTH1_BIT (1 << 1) /* Word length bit 1
123 * Word length bits table:
129 #define SC16IS7XX_LCR_STOPLEN_BIT (1 << 2) /* STOP length bit
131 * STOP length bit table:
133 * 1 -> 1-1.5 stop bits if
135 * 2 stop bits otherwise
137 #define SC16IS7XX_LCR_PARITY_BIT (1 << 3) /* Parity bit enable */
138 #define SC16IS7XX_LCR_EVENPARITY_BIT (1 << 4) /* Even parity bit enable */
139 #define SC16IS7XX_LCR_FORCEPARITY_BIT (1 << 5) /* 9-bit multidrop parity */
140 #define SC16IS7XX_LCR_TXBREAK_BIT (1 << 6) /* TX break enable */
141 #define SC16IS7XX_LCR_DLAB_BIT (1 << 7) /* Divisor Latch enable */
142 #define SC16IS7XX_LCR_WORD_LEN_5 (0x00)
143 #define SC16IS7XX_LCR_WORD_LEN_6 (0x01)
144 #define SC16IS7XX_LCR_WORD_LEN_7 (0x02)
145 #define SC16IS7XX_LCR_WORD_LEN_8 (0x03)
146 #define SC16IS7XX_LCR_CONF_MODE_A SC16IS7XX_LCR_DLAB_BIT /* Special
148 #define SC16IS7XX_LCR_CONF_MODE_B 0xBF /* Enhanced
151 /* MCR register bits */
152 #define SC16IS7XX_MCR_DTR_BIT (1 << 0) /* DTR complement
155 #define SC16IS7XX_MCR_RTS_BIT (1 << 1) /* RTS complement */
156 #define SC16IS7XX_MCR_TCRTLR_BIT (1 << 2) /* TCR/TLR register enable */
157 #define SC16IS7XX_MCR_LOOP_BIT (1 << 4) /* Enable loopback test mode */
158 #define SC16IS7XX_MCR_XONANY_BIT (1 << 5) /* Enable Xon Any
162 #define SC16IS7XX_MCR_IRDA_BIT (1 << 6) /* Enable IrDA mode
166 #define SC16IS7XX_MCR_CLKSEL_BIT (1 << 7) /* Divide clock by 4
171 /* LSR register bits */
172 #define SC16IS7XX_LSR_DR_BIT (1 << 0) /* Receiver data ready */
173 #define SC16IS7XX_LSR_OE_BIT (1 << 1) /* Overrun Error */
174 #define SC16IS7XX_LSR_PE_BIT (1 << 2) /* Parity Error */
175 #define SC16IS7XX_LSR_FE_BIT (1 << 3) /* Frame Error */
176 #define SC16IS7XX_LSR_BI_BIT (1 << 4) /* Break Interrupt */
177 #define SC16IS7XX_LSR_BRK_ERROR_MASK 0x1E /* BI, FE, PE, OE bits */
178 #define SC16IS7XX_LSR_THRE_BIT (1 << 5) /* TX holding register empty */
179 #define SC16IS7XX_LSR_TEMT_BIT (1 << 6) /* Transmitter empty */
180 #define SC16IS7XX_LSR_FIFOE_BIT (1 << 7) /* Fifo Error */
182 /* MSR register bits */
183 #define SC16IS7XX_MSR_DCTS_BIT (1 << 0) /* Delta CTS Clear To Send */
184 #define SC16IS7XX_MSR_DDSR_BIT (1 << 1) /* Delta DSR Data Set Ready
188 #define SC16IS7XX_MSR_DRI_BIT (1 << 2) /* Delta RI Ring Indicator
192 #define SC16IS7XX_MSR_DCD_BIT (1 << 3) /* Delta CD Carrier Detect
196 #define SC16IS7XX_MSR_CTS_BIT (1 << 0) /* CTS */
197 #define SC16IS7XX_MSR_DSR_BIT (1 << 1) /* DSR (IO4)
200 #define SC16IS7XX_MSR_RI_BIT (1 << 2) /* RI (IO7)
203 #define SC16IS7XX_MSR_CD_BIT (1 << 3) /* CD (IO6)
206 #define SC16IS7XX_MSR_DELTA_MASK 0x0F /* Any of the delta bits! */
210 * TCR trigger levels are available from 0 to 60 characters with a granularity
212 * The programmer must program the TCR such that TCR[3:0] > TCR[7:4]. There is
213 * no built-in hardware check to make sure this condition is met. Also, the TCR
214 * must be programmed with this condition before auto RTS or software flow
215 * control is enabled to avoid spurious operation of the device.
217 #define SC16IS7XX_TCR_RX_HALT(words) ((((words) / 4) & 0x0f) << 0)
218 #define SC16IS7XX_TCR_RX_RESUME(words) ((((words) / 4) & 0x0f) << 4)
222 * If TLR[3:0] or TLR[7:4] are logical 0, the selectable trigger levels via the
223 * FIFO Control Register (FCR) are used for the transmit and receive FIFO
224 * trigger levels. Trigger levels from 4 characters to 60 characters are
225 * available with a granularity of four.
227 * When the trigger level setting in TLR is zero, the SC16IS740/750/760 uses the
228 * trigger level setting defined in FCR. If TLR has non-zero trigger level value
229 * the trigger level defined in FCR is discarded. This applies to both transmit
230 * FIFO and receive FIFO trigger level setting.
232 * When TLR is used for RX trigger level control, FCR[7:6] should be left at the
233 * default state, that is, '00'.
235 #define SC16IS7XX_TLR_TX_TRIGGER(words) ((((words) / 4) & 0x0f) << 0)
236 #define SC16IS7XX_TLR_RX_TRIGGER(words) ((((words) / 4) & 0x0f) << 4)
238 /* IOControl register bits (Only 750/760) */
239 #define SC16IS7XX_IOCONTROL_LATCH_BIT (1 << 0) /* Enable input latching */
240 #define SC16IS7XX_IOCONTROL_GPIO_BIT (1 << 1) /* Enable GPIO[7:4] */
241 #define SC16IS7XX_IOCONTROL_SRESET_BIT (1 << 3) /* Software Reset */
243 /* EFCR register bits */
244 #define SC16IS7XX_EFCR_9BIT_MODE_BIT (1 << 0) /* Enable 9-bit or Multidrop
246 #define SC16IS7XX_EFCR_RXDISABLE_BIT (1 << 1) /* Disable receiver */
247 #define SC16IS7XX_EFCR_TXDISABLE_BIT (1 << 2) /* Disable transmitter */
248 #define SC16IS7XX_EFCR_AUTO_RS485_BIT (1 << 4) /* Auto RS485 RTS direction */
249 #define SC16IS7XX_EFCR_RTS_INVERT_BIT (1 << 5) /* RTS output inversion */
250 #define SC16IS7XX_EFCR_IRDA_MODE_BIT (1 << 7) /* IrDA mode
251 * 0 = rate upto 115.2 kbit/s
253 * 1 = rate upto 1.152 Mbit/s
257 /* EFR register bits */
258 #define SC16IS7XX_EFR_AUTORTS_BIT (1 << 6) /* Auto RTS flow ctrl enable */
259 #define SC16IS7XX_EFR_AUTOCTS_BIT (1 << 7) /* Auto CTS flow ctrl enable */
260 #define SC16IS7XX_EFR_XOFF2_DETECT_BIT (1 << 5) /* Enable Xoff2 detection */
261 #define SC16IS7XX_EFR_ENABLE_BIT (1 << 4) /* Enable enhanced functions
262 * and writing to IER[7:4],
265 #define SC16IS7XX_EFR_SWFLOW3_BIT (1 << 3) /* SWFLOW bit 3 */
266 #define SC16IS7XX_EFR_SWFLOW2_BIT (1 << 2) /* SWFLOW bit 2
268 * SWFLOW bits 3 & 2 table:
269 * 00 -> no transmitter flow
271 * 01 -> transmitter generates
273 * 10 -> transmitter generates
275 * 11 -> transmitter generates
276 * XON1, XON2, XOFF1 and
279 #define SC16IS7XX_EFR_SWFLOW1_BIT (1 << 1) /* SWFLOW bit 2 */
280 #define SC16IS7XX_EFR_SWFLOW0_BIT (1 << 0) /* SWFLOW bit 3
282 * SWFLOW bits 3 & 2 table:
283 * 00 -> no received flow
285 * 01 -> receiver compares
287 * 10 -> receiver compares
289 * 11 -> receiver compares
290 * XON1, XON2, XOFF1 and
294 /* Misc definitions */
295 #define SC16IS7XX_FIFO_SIZE (64)
296 #define SC16IS7XX_REG_SHIFT 2
298 struct sc16is7xx_devtype {
304 #define SC16IS7XX_RECONF_MD (1 << 0)
305 #define SC16IS7XX_RECONF_IER (1 << 1)
306 #define SC16IS7XX_RECONF_RS485 (1 << 2)
308 struct sc16is7xx_one_config {
313 struct sc16is7xx_one {
314 struct uart_port port;
315 struct kthread_work tx_work;
316 struct kthread_work reg_work;
317 struct sc16is7xx_one_config config;
320 struct sc16is7xx_port {
321 struct uart_driver uart;
322 struct sc16is7xx_devtype *devtype;
323 struct regmap *regmap;
325 #ifdef CONFIG_GPIOLIB
326 struct gpio_chip gpio;
328 unsigned char buf[SC16IS7XX_FIFO_SIZE];
329 struct kthread_worker kworker;
330 struct task_struct *kworker_task;
331 struct kthread_work irq_work;
332 struct sc16is7xx_one p[0];
335 #define to_sc16is7xx_port(p,e) ((container_of((p), struct sc16is7xx_port, e)))
336 #define to_sc16is7xx_one(p,e) ((container_of((p), struct sc16is7xx_one, e)))
338 static u8 sc16is7xx_port_read(struct uart_port *port, u8 reg)
340 struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
341 unsigned int val = 0;
343 regmap_read(s->regmap,
344 (reg << SC16IS7XX_REG_SHIFT) | port->line, &val);
349 static void sc16is7xx_port_write(struct uart_port *port, u8 reg, u8 val)
351 struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
353 regmap_write(s->regmap,
354 (reg << SC16IS7XX_REG_SHIFT) | port->line, val);
357 static void sc16is7xx_fifo_read(struct uart_port *port, unsigned int rxlen)
359 struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
360 u8 addr = (SC16IS7XX_RHR_REG << SC16IS7XX_REG_SHIFT) | port->line;
362 regcache_cache_bypass(s->regmap, true);
363 regmap_raw_read(s->regmap, addr, s->buf, rxlen);
364 regcache_cache_bypass(s->regmap, false);
367 static void sc16is7xx_fifo_write(struct uart_port *port, u8 to_send)
369 struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
370 u8 addr = (SC16IS7XX_THR_REG << SC16IS7XX_REG_SHIFT) | port->line;
372 regcache_cache_bypass(s->regmap, true);
373 regmap_raw_write(s->regmap, addr, s->buf, to_send);
374 regcache_cache_bypass(s->regmap, false);
377 static void sc16is7xx_port_update(struct uart_port *port, u8 reg,
380 struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
382 regmap_update_bits(s->regmap,
383 (reg << SC16IS7XX_REG_SHIFT) | port->line,
388 static void sc16is7xx_power(struct uart_port *port, int on)
390 sc16is7xx_port_update(port, SC16IS7XX_IER_REG,
391 SC16IS7XX_IER_SLEEP_BIT,
392 on ? 0 : SC16IS7XX_IER_SLEEP_BIT);
395 static const struct sc16is7xx_devtype sc16is74x_devtype = {
401 static const struct sc16is7xx_devtype sc16is750_devtype = {
407 static const struct sc16is7xx_devtype sc16is752_devtype = {
413 static const struct sc16is7xx_devtype sc16is760_devtype = {
419 static const struct sc16is7xx_devtype sc16is762_devtype = {
425 static bool sc16is7xx_regmap_volatile(struct device *dev, unsigned int reg)
427 switch (reg >> SC16IS7XX_REG_SHIFT) {
428 case SC16IS7XX_RHR_REG:
429 case SC16IS7XX_IIR_REG:
430 case SC16IS7XX_LSR_REG:
431 case SC16IS7XX_MSR_REG:
432 case SC16IS7XX_TXLVL_REG:
433 case SC16IS7XX_RXLVL_REG:
434 case SC16IS7XX_IOSTATE_REG:
443 static bool sc16is7xx_regmap_precious(struct device *dev, unsigned int reg)
445 switch (reg >> SC16IS7XX_REG_SHIFT) {
446 case SC16IS7XX_RHR_REG:
455 static int sc16is7xx_set_baud(struct uart_port *port, int baud)
457 struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
460 unsigned long clk = port->uartclk, div = clk / 16 / baud;
463 prescaler = SC16IS7XX_MCR_CLKSEL_BIT;
467 lcr = sc16is7xx_port_read(port, SC16IS7XX_LCR_REG);
469 /* Open the LCR divisors for configuration */
470 sc16is7xx_port_write(port, SC16IS7XX_LCR_REG,
471 SC16IS7XX_LCR_CONF_MODE_B);
473 /* Enable enhanced features */
474 regcache_cache_bypass(s->regmap, true);
475 sc16is7xx_port_write(port, SC16IS7XX_EFR_REG,
476 SC16IS7XX_EFR_ENABLE_BIT);
477 regcache_cache_bypass(s->regmap, false);
479 /* Put LCR back to the normal mode */
480 sc16is7xx_port_write(port, SC16IS7XX_LCR_REG, lcr);
482 sc16is7xx_port_update(port, SC16IS7XX_MCR_REG,
483 SC16IS7XX_MCR_CLKSEL_BIT,
486 /* Open the LCR divisors for configuration */
487 sc16is7xx_port_write(port, SC16IS7XX_LCR_REG,
488 SC16IS7XX_LCR_CONF_MODE_A);
490 /* Write the new divisor */
491 regcache_cache_bypass(s->regmap, true);
492 sc16is7xx_port_write(port, SC16IS7XX_DLH_REG, div / 256);
493 sc16is7xx_port_write(port, SC16IS7XX_DLL_REG, div % 256);
494 regcache_cache_bypass(s->regmap, false);
496 /* Put LCR back to the normal mode */
497 sc16is7xx_port_write(port, SC16IS7XX_LCR_REG, lcr);
499 return DIV_ROUND_CLOSEST(clk / 16, div);
502 static void sc16is7xx_handle_rx(struct uart_port *port, unsigned int rxlen,
505 struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
506 unsigned int lsr = 0, ch, flag, bytes_read, i;
507 bool read_lsr = (iir == SC16IS7XX_IIR_RLSE_SRC) ? true : false;
509 if (unlikely(rxlen >= sizeof(s->buf))) {
510 dev_warn_ratelimited(port->dev,
511 "Port %i: Possible RX FIFO overrun: %d\n",
513 port->icount.buf_overrun++;
514 /* Ensure sanity of RX level */
515 rxlen = sizeof(s->buf);
519 /* Only read lsr if there are possible errors in FIFO */
521 lsr = sc16is7xx_port_read(port, SC16IS7XX_LSR_REG);
522 if (!(lsr & SC16IS7XX_LSR_FIFOE_BIT))
523 read_lsr = false; /* No errors left in FIFO */
528 s->buf[0] = sc16is7xx_port_read(port, SC16IS7XX_RHR_REG);
531 sc16is7xx_fifo_read(port, rxlen);
535 lsr &= SC16IS7XX_LSR_BRK_ERROR_MASK;
541 if (lsr & SC16IS7XX_LSR_BI_BIT) {
543 if (uart_handle_break(port))
545 } else if (lsr & SC16IS7XX_LSR_PE_BIT)
546 port->icount.parity++;
547 else if (lsr & SC16IS7XX_LSR_FE_BIT)
548 port->icount.frame++;
549 else if (lsr & SC16IS7XX_LSR_OE_BIT)
550 port->icount.overrun++;
552 lsr &= port->read_status_mask;
553 if (lsr & SC16IS7XX_LSR_BI_BIT)
555 else if (lsr & SC16IS7XX_LSR_PE_BIT)
557 else if (lsr & SC16IS7XX_LSR_FE_BIT)
559 else if (lsr & SC16IS7XX_LSR_OE_BIT)
563 for (i = 0; i < bytes_read; ++i) {
565 if (uart_handle_sysrq_char(port, ch))
568 if (lsr & port->ignore_status_mask)
571 uart_insert_char(port, lsr, SC16IS7XX_LSR_OE_BIT, ch,
577 tty_flip_buffer_push(&port->state->port);
580 static void sc16is7xx_handle_tx(struct uart_port *port)
582 struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
583 struct circ_buf *xmit = &port->state->xmit;
584 unsigned int txlen, to_send, i;
586 if (unlikely(port->x_char)) {
587 sc16is7xx_port_write(port, SC16IS7XX_THR_REG, port->x_char);
593 if (uart_circ_empty(xmit) || uart_tx_stopped(port))
596 /* Get length of data pending in circular buffer */
597 to_send = uart_circ_chars_pending(xmit);
598 if (likely(to_send)) {
599 /* Limit to size of TX FIFO */
600 txlen = sc16is7xx_port_read(port, SC16IS7XX_TXLVL_REG);
601 to_send = (to_send > txlen) ? txlen : to_send;
603 /* Add data to send */
604 port->icount.tx += to_send;
606 /* Convert to linear buffer */
607 for (i = 0; i < to_send; ++i) {
608 s->buf[i] = xmit->buf[xmit->tail];
609 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
612 sc16is7xx_fifo_write(port, to_send);
615 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
616 uart_write_wakeup(port);
619 static void sc16is7xx_port_irq(struct sc16is7xx_port *s, int portno)
621 struct uart_port *port = &s->p[portno].port;
624 unsigned int iir, msr, rxlen;
626 iir = sc16is7xx_port_read(port, SC16IS7XX_IIR_REG);
627 if (iir & SC16IS7XX_IIR_NO_INT_BIT)
630 iir &= SC16IS7XX_IIR_ID_MASK;
633 case SC16IS7XX_IIR_RDI_SRC:
634 case SC16IS7XX_IIR_RLSE_SRC:
635 case SC16IS7XX_IIR_RTOI_SRC:
636 case SC16IS7XX_IIR_XOFFI_SRC:
637 rxlen = sc16is7xx_port_read(port, SC16IS7XX_RXLVL_REG);
639 sc16is7xx_handle_rx(port, rxlen, iir);
642 case SC16IS7XX_IIR_CTSRTS_SRC:
643 msr = sc16is7xx_port_read(port, SC16IS7XX_MSR_REG);
644 uart_handle_cts_change(port,
645 !!(msr & SC16IS7XX_MSR_CTS_BIT));
647 case SC16IS7XX_IIR_THRI_SRC:
648 sc16is7xx_handle_tx(port);
651 dev_err_ratelimited(port->dev,
652 "Port %i: Unexpected interrupt: %x",
659 static void sc16is7xx_ist(struct kthread_work *ws)
661 struct sc16is7xx_port *s = to_sc16is7xx_port(ws, irq_work);
664 for (i = 0; i < s->uart.nr; ++i)
665 sc16is7xx_port_irq(s, i);
668 static irqreturn_t sc16is7xx_irq(int irq, void *dev_id)
670 struct sc16is7xx_port *s = (struct sc16is7xx_port *)dev_id;
672 queue_kthread_work(&s->kworker, &s->irq_work);
677 static void sc16is7xx_tx_proc(struct kthread_work *ws)
679 struct uart_port *port = &(to_sc16is7xx_one(ws, tx_work)->port);
681 if ((port->rs485.flags & SER_RS485_ENABLED) &&
682 (port->rs485.delay_rts_before_send > 0))
683 msleep(port->rs485.delay_rts_before_send);
685 sc16is7xx_handle_tx(port);
688 static void sc16is7xx_reconf_rs485(struct uart_port *port)
690 const u32 mask = SC16IS7XX_EFCR_AUTO_RS485_BIT |
691 SC16IS7XX_EFCR_RTS_INVERT_BIT;
693 struct serial_rs485 *rs485 = &port->rs485;
694 unsigned long irqflags;
696 spin_lock_irqsave(&port->lock, irqflags);
697 if (rs485->flags & SER_RS485_ENABLED) {
698 efcr |= SC16IS7XX_EFCR_AUTO_RS485_BIT;
700 if (rs485->flags & SER_RS485_RTS_AFTER_SEND)
701 efcr |= SC16IS7XX_EFCR_RTS_INVERT_BIT;
703 spin_unlock_irqrestore(&port->lock, irqflags);
705 sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG, mask, efcr);
708 static void sc16is7xx_reg_proc(struct kthread_work *ws)
710 struct sc16is7xx_one *one = to_sc16is7xx_one(ws, reg_work);
711 struct sc16is7xx_one_config config;
712 unsigned long irqflags;
714 spin_lock_irqsave(&one->port.lock, irqflags);
715 config = one->config;
716 memset(&one->config, 0, sizeof(one->config));
717 spin_unlock_irqrestore(&one->port.lock, irqflags);
719 if (config.flags & SC16IS7XX_RECONF_MD)
720 sc16is7xx_port_update(&one->port, SC16IS7XX_MCR_REG,
721 SC16IS7XX_MCR_LOOP_BIT,
722 (one->port.mctrl & TIOCM_LOOP) ?
723 SC16IS7XX_MCR_LOOP_BIT : 0);
725 if (config.flags & SC16IS7XX_RECONF_IER)
726 sc16is7xx_port_update(&one->port, SC16IS7XX_IER_REG,
727 config.ier_clear, 0);
729 if (config.flags & SC16IS7XX_RECONF_RS485)
730 sc16is7xx_reconf_rs485(&one->port);
733 static void sc16is7xx_ier_clear(struct uart_port *port, u8 bit)
735 struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
736 struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
738 one->config.flags |= SC16IS7XX_RECONF_IER;
739 one->config.ier_clear |= bit;
740 queue_kthread_work(&s->kworker, &one->reg_work);
743 static void sc16is7xx_stop_tx(struct uart_port *port)
745 sc16is7xx_ier_clear(port, SC16IS7XX_IER_THRI_BIT);
748 static void sc16is7xx_stop_rx(struct uart_port *port)
750 sc16is7xx_ier_clear(port, SC16IS7XX_IER_RDI_BIT);
753 static void sc16is7xx_start_tx(struct uart_port *port)
755 struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
756 struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
758 queue_kthread_work(&s->kworker, &one->tx_work);
761 static unsigned int sc16is7xx_tx_empty(struct uart_port *port)
765 lsr = sc16is7xx_port_read(port, SC16IS7XX_LSR_REG);
767 return (lsr & SC16IS7XX_LSR_TEMT_BIT) ? TIOCSER_TEMT : 0;
770 static unsigned int sc16is7xx_get_mctrl(struct uart_port *port)
772 /* DCD and DSR are not wired and CTS/RTS is handled automatically
773 * so just indicate DSR and CAR asserted
775 return TIOCM_DSR | TIOCM_CAR;
778 static void sc16is7xx_set_mctrl(struct uart_port *port, unsigned int mctrl)
780 struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
781 struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
783 one->config.flags |= SC16IS7XX_RECONF_MD;
784 queue_kthread_work(&s->kworker, &one->reg_work);
787 static void sc16is7xx_break_ctl(struct uart_port *port, int break_state)
789 sc16is7xx_port_update(port, SC16IS7XX_LCR_REG,
790 SC16IS7XX_LCR_TXBREAK_BIT,
791 break_state ? SC16IS7XX_LCR_TXBREAK_BIT : 0);
794 static void sc16is7xx_set_termios(struct uart_port *port,
795 struct ktermios *termios,
796 struct ktermios *old)
798 struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
799 unsigned int lcr, flow = 0;
802 /* Mask termios capabilities we don't support */
803 termios->c_cflag &= ~CMSPAR;
806 switch (termios->c_cflag & CSIZE) {
808 lcr = SC16IS7XX_LCR_WORD_LEN_5;
811 lcr = SC16IS7XX_LCR_WORD_LEN_6;
814 lcr = SC16IS7XX_LCR_WORD_LEN_7;
817 lcr = SC16IS7XX_LCR_WORD_LEN_8;
820 lcr = SC16IS7XX_LCR_WORD_LEN_8;
821 termios->c_cflag &= ~CSIZE;
822 termios->c_cflag |= CS8;
827 if (termios->c_cflag & PARENB) {
828 lcr |= SC16IS7XX_LCR_PARITY_BIT;
829 if (!(termios->c_cflag & PARODD))
830 lcr |= SC16IS7XX_LCR_EVENPARITY_BIT;
834 if (termios->c_cflag & CSTOPB)
835 lcr |= SC16IS7XX_LCR_STOPLEN_BIT; /* 2 stops */
837 /* Set read status mask */
838 port->read_status_mask = SC16IS7XX_LSR_OE_BIT;
839 if (termios->c_iflag & INPCK)
840 port->read_status_mask |= SC16IS7XX_LSR_PE_BIT |
841 SC16IS7XX_LSR_FE_BIT;
842 if (termios->c_iflag & (BRKINT | PARMRK))
843 port->read_status_mask |= SC16IS7XX_LSR_BI_BIT;
845 /* Set status ignore mask */
846 port->ignore_status_mask = 0;
847 if (termios->c_iflag & IGNBRK)
848 port->ignore_status_mask |= SC16IS7XX_LSR_BI_BIT;
849 if (!(termios->c_cflag & CREAD))
850 port->ignore_status_mask |= SC16IS7XX_LSR_BRK_ERROR_MASK;
852 sc16is7xx_port_write(port, SC16IS7XX_LCR_REG,
853 SC16IS7XX_LCR_CONF_MODE_B);
855 /* Configure flow control */
856 regcache_cache_bypass(s->regmap, true);
857 sc16is7xx_port_write(port, SC16IS7XX_XON1_REG, termios->c_cc[VSTART]);
858 sc16is7xx_port_write(port, SC16IS7XX_XOFF1_REG, termios->c_cc[VSTOP]);
859 if (termios->c_cflag & CRTSCTS)
860 flow |= SC16IS7XX_EFR_AUTOCTS_BIT |
861 SC16IS7XX_EFR_AUTORTS_BIT;
862 if (termios->c_iflag & IXON)
863 flow |= SC16IS7XX_EFR_SWFLOW3_BIT;
864 if (termios->c_iflag & IXOFF)
865 flow |= SC16IS7XX_EFR_SWFLOW1_BIT;
867 sc16is7xx_port_write(port, SC16IS7XX_EFR_REG, flow);
868 regcache_cache_bypass(s->regmap, false);
870 /* Update LCR register */
871 sc16is7xx_port_write(port, SC16IS7XX_LCR_REG, lcr);
873 /* Get baud rate generator configuration */
874 baud = uart_get_baud_rate(port, termios, old,
875 port->uartclk / 16 / 4 / 0xffff,
878 /* Setup baudrate generator */
879 baud = sc16is7xx_set_baud(port, baud);
881 /* Update timeout according to new baud rate */
882 uart_update_timeout(port, termios->c_cflag, baud);
885 static int sc16is7xx_config_rs485(struct uart_port *port,
886 struct serial_rs485 *rs485)
888 struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
889 struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
891 if (rs485->flags & SER_RS485_ENABLED) {
892 bool rts_during_rx, rts_during_tx;
894 rts_during_rx = rs485->flags & SER_RS485_RTS_AFTER_SEND;
895 rts_during_tx = rs485->flags & SER_RS485_RTS_ON_SEND;
897 if (rts_during_rx == rts_during_tx)
899 "unsupported RTS signalling on_send:%d after_send:%d - exactly one of RS485 RTS flags should be set\n",
900 rts_during_tx, rts_during_rx);
903 * RTS signal is handled by HW, it's timing can't be influenced.
904 * However, it's sometimes useful to delay TX even without RTS
905 * control therefore we try to handle .delay_rts_before_send.
907 if (rs485->delay_rts_after_send)
911 port->rs485 = *rs485;
912 one->config.flags |= SC16IS7XX_RECONF_RS485;
913 queue_kthread_work(&s->kworker, &one->reg_work);
918 static int sc16is7xx_startup(struct uart_port *port)
920 struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
923 sc16is7xx_power(port, 1);
926 val = SC16IS7XX_FCR_RXRESET_BIT | SC16IS7XX_FCR_TXRESET_BIT;
927 sc16is7xx_port_write(port, SC16IS7XX_FCR_REG, val);
929 sc16is7xx_port_write(port, SC16IS7XX_FCR_REG,
930 SC16IS7XX_FCR_FIFO_BIT);
933 sc16is7xx_port_write(port, SC16IS7XX_LCR_REG,
934 SC16IS7XX_LCR_CONF_MODE_B);
936 regcache_cache_bypass(s->regmap, true);
938 /* Enable write access to enhanced features and internal clock div */
939 sc16is7xx_port_write(port, SC16IS7XX_EFR_REG,
940 SC16IS7XX_EFR_ENABLE_BIT);
943 sc16is7xx_port_update(port, SC16IS7XX_MCR_REG,
944 SC16IS7XX_MCR_TCRTLR_BIT,
945 SC16IS7XX_MCR_TCRTLR_BIT);
947 /* Configure flow control levels */
948 /* Flow control halt level 48, resume level 24 */
949 sc16is7xx_port_write(port, SC16IS7XX_TCR_REG,
950 SC16IS7XX_TCR_RX_RESUME(24) |
951 SC16IS7XX_TCR_RX_HALT(48));
953 regcache_cache_bypass(s->regmap, false);
955 /* Now, initialize the UART */
956 sc16is7xx_port_write(port, SC16IS7XX_LCR_REG, SC16IS7XX_LCR_WORD_LEN_8);
958 /* Enable the Rx and Tx FIFO */
959 sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG,
960 SC16IS7XX_EFCR_RXDISABLE_BIT |
961 SC16IS7XX_EFCR_TXDISABLE_BIT,
964 /* Enable RX, TX, CTS change interrupts */
965 val = SC16IS7XX_IER_RDI_BIT | SC16IS7XX_IER_THRI_BIT |
966 SC16IS7XX_IER_CTSI_BIT;
967 sc16is7xx_port_write(port, SC16IS7XX_IER_REG, val);
972 static void sc16is7xx_shutdown(struct uart_port *port)
974 struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
976 /* Disable all interrupts */
977 sc16is7xx_port_write(port, SC16IS7XX_IER_REG, 0);
979 sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG,
980 SC16IS7XX_EFCR_RXDISABLE_BIT |
981 SC16IS7XX_EFCR_TXDISABLE_BIT,
982 SC16IS7XX_EFCR_RXDISABLE_BIT |
983 SC16IS7XX_EFCR_TXDISABLE_BIT);
985 sc16is7xx_power(port, 0);
987 flush_kthread_worker(&s->kworker);
990 static const char *sc16is7xx_type(struct uart_port *port)
992 struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
994 return (port->type == PORT_SC16IS7XX) ? s->devtype->name : NULL;
997 static int sc16is7xx_request_port(struct uart_port *port)
1003 static void sc16is7xx_config_port(struct uart_port *port, int flags)
1005 if (flags & UART_CONFIG_TYPE)
1006 port->type = PORT_SC16IS7XX;
1009 static int sc16is7xx_verify_port(struct uart_port *port,
1010 struct serial_struct *s)
1012 if ((s->type != PORT_UNKNOWN) && (s->type != PORT_SC16IS7XX))
1014 if (s->irq != port->irq)
1020 static void sc16is7xx_pm(struct uart_port *port, unsigned int state,
1021 unsigned int oldstate)
1023 sc16is7xx_power(port, (state == UART_PM_STATE_ON) ? 1 : 0);
1026 static void sc16is7xx_null_void(struct uart_port *port)
1031 static const struct uart_ops sc16is7xx_ops = {
1032 .tx_empty = sc16is7xx_tx_empty,
1033 .set_mctrl = sc16is7xx_set_mctrl,
1034 .get_mctrl = sc16is7xx_get_mctrl,
1035 .stop_tx = sc16is7xx_stop_tx,
1036 .start_tx = sc16is7xx_start_tx,
1037 .stop_rx = sc16is7xx_stop_rx,
1038 .break_ctl = sc16is7xx_break_ctl,
1039 .startup = sc16is7xx_startup,
1040 .shutdown = sc16is7xx_shutdown,
1041 .set_termios = sc16is7xx_set_termios,
1042 .type = sc16is7xx_type,
1043 .request_port = sc16is7xx_request_port,
1044 .release_port = sc16is7xx_null_void,
1045 .config_port = sc16is7xx_config_port,
1046 .verify_port = sc16is7xx_verify_port,
1050 #ifdef CONFIG_GPIOLIB
1051 static int sc16is7xx_gpio_get(struct gpio_chip *chip, unsigned offset)
1054 struct sc16is7xx_port *s = container_of(chip, struct sc16is7xx_port,
1056 struct uart_port *port = &s->p[0].port;
1058 val = sc16is7xx_port_read(port, SC16IS7XX_IOSTATE_REG);
1060 return !!(val & BIT(offset));
1063 static void sc16is7xx_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
1065 struct sc16is7xx_port *s = container_of(chip, struct sc16is7xx_port,
1067 struct uart_port *port = &s->p[0].port;
1069 sc16is7xx_port_update(port, SC16IS7XX_IOSTATE_REG, BIT(offset),
1070 val ? BIT(offset) : 0);
1073 static int sc16is7xx_gpio_direction_input(struct gpio_chip *chip,
1076 struct sc16is7xx_port *s = container_of(chip, struct sc16is7xx_port,
1078 struct uart_port *port = &s->p[0].port;
1080 sc16is7xx_port_update(port, SC16IS7XX_IODIR_REG, BIT(offset), 0);
1085 static int sc16is7xx_gpio_direction_output(struct gpio_chip *chip,
1086 unsigned offset, int val)
1088 struct sc16is7xx_port *s = container_of(chip, struct sc16is7xx_port,
1090 struct uart_port *port = &s->p[0].port;
1092 sc16is7xx_port_update(port, SC16IS7XX_IOSTATE_REG, BIT(offset),
1093 val ? BIT(offset) : 0);
1094 sc16is7xx_port_update(port, SC16IS7XX_IODIR_REG, BIT(offset),
1101 static int sc16is7xx_probe(struct device *dev,
1102 struct sc16is7xx_devtype *devtype,
1103 struct regmap *regmap, int irq, unsigned long flags)
1105 struct sched_param sched_param = { .sched_priority = MAX_RT_PRIO / 2 };
1106 unsigned long freq, *pfreq = dev_get_platdata(dev);
1108 struct sc16is7xx_port *s;
1111 return PTR_ERR(regmap);
1113 /* Alloc port structure */
1114 s = devm_kzalloc(dev, sizeof(*s) +
1115 sizeof(struct sc16is7xx_one) * devtype->nr_uart,
1118 dev_err(dev, "Error allocating port structure\n");
1122 s->clk = devm_clk_get(dev, NULL);
1123 if (IS_ERR(s->clk)) {
1127 return PTR_ERR(s->clk);
1129 clk_prepare_enable(s->clk);
1130 freq = clk_get_rate(s->clk);
1134 s->devtype = devtype;
1135 dev_set_drvdata(dev, s);
1137 /* Register UART driver */
1138 s->uart.owner = THIS_MODULE;
1139 s->uart.dev_name = "ttySC";
1140 s->uart.nr = devtype->nr_uart;
1141 ret = uart_register_driver(&s->uart);
1143 dev_err(dev, "Registering UART driver failed\n");
1147 init_kthread_worker(&s->kworker);
1148 init_kthread_work(&s->irq_work, sc16is7xx_ist);
1149 s->kworker_task = kthread_run(kthread_worker_fn, &s->kworker,
1151 if (IS_ERR(s->kworker_task)) {
1152 ret = PTR_ERR(s->kworker_task);
1155 sched_setscheduler(s->kworker_task, SCHED_FIFO, &sched_param);
1157 #ifdef CONFIG_GPIOLIB
1158 if (devtype->nr_gpio) {
1159 /* Setup GPIO cotroller */
1160 s->gpio.owner = THIS_MODULE;
1162 s->gpio.label = dev_name(dev);
1163 s->gpio.direction_input = sc16is7xx_gpio_direction_input;
1164 s->gpio.get = sc16is7xx_gpio_get;
1165 s->gpio.direction_output = sc16is7xx_gpio_direction_output;
1166 s->gpio.set = sc16is7xx_gpio_set;
1168 s->gpio.ngpio = devtype->nr_gpio;
1169 s->gpio.can_sleep = 1;
1170 ret = gpiochip_add(&s->gpio);
1176 for (i = 0; i < devtype->nr_uart; ++i) {
1177 /* Initialize port data */
1178 s->p[i].port.line = i;
1179 s->p[i].port.dev = dev;
1180 s->p[i].port.irq = irq;
1181 s->p[i].port.type = PORT_SC16IS7XX;
1182 s->p[i].port.fifosize = SC16IS7XX_FIFO_SIZE;
1183 s->p[i].port.flags = UPF_FIXED_TYPE | UPF_LOW_LATENCY;
1184 s->p[i].port.iotype = UPIO_PORT;
1185 s->p[i].port.uartclk = freq;
1186 s->p[i].port.rs485_config = sc16is7xx_config_rs485;
1187 s->p[i].port.ops = &sc16is7xx_ops;
1188 /* Disable all interrupts */
1189 sc16is7xx_port_write(&s->p[i].port, SC16IS7XX_IER_REG, 0);
1191 sc16is7xx_port_write(&s->p[i].port, SC16IS7XX_EFCR_REG,
1192 SC16IS7XX_EFCR_RXDISABLE_BIT |
1193 SC16IS7XX_EFCR_TXDISABLE_BIT);
1194 /* Initialize kthread work structs */
1195 init_kthread_work(&s->p[i].tx_work, sc16is7xx_tx_proc);
1196 init_kthread_work(&s->p[i].reg_work, sc16is7xx_reg_proc);
1198 uart_add_one_port(&s->uart, &s->p[i].port);
1199 /* Go to suspend mode */
1200 sc16is7xx_power(&s->p[i].port, 0);
1203 /* Setup interrupt */
1204 ret = devm_request_irq(dev, irq, sc16is7xx_irq,
1205 IRQF_ONESHOT | flags, dev_name(dev), s);
1209 for (i = 0; i < s->uart.nr; i++)
1210 uart_remove_one_port(&s->uart, &s->p[i].port);
1212 #ifdef CONFIG_GPIOLIB
1213 if (devtype->nr_gpio)
1214 gpiochip_remove(&s->gpio);
1218 kthread_stop(s->kworker_task);
1221 uart_unregister_driver(&s->uart);
1224 if (!IS_ERR(s->clk))
1225 clk_disable_unprepare(s->clk);
1230 static int sc16is7xx_remove(struct device *dev)
1232 struct sc16is7xx_port *s = dev_get_drvdata(dev);
1235 #ifdef CONFIG_GPIOLIB
1236 if (s->devtype->nr_gpio)
1237 gpiochip_remove(&s->gpio);
1240 for (i = 0; i < s->uart.nr; i++) {
1241 uart_remove_one_port(&s->uart, &s->p[i].port);
1242 sc16is7xx_power(&s->p[i].port, 0);
1245 flush_kthread_worker(&s->kworker);
1246 kthread_stop(s->kworker_task);
1248 uart_unregister_driver(&s->uart);
1249 if (!IS_ERR(s->clk))
1250 clk_disable_unprepare(s->clk);
1255 static const struct of_device_id __maybe_unused sc16is7xx_dt_ids[] = {
1256 { .compatible = "nxp,sc16is740", .data = &sc16is74x_devtype, },
1257 { .compatible = "nxp,sc16is741", .data = &sc16is74x_devtype, },
1258 { .compatible = "nxp,sc16is750", .data = &sc16is750_devtype, },
1259 { .compatible = "nxp,sc16is752", .data = &sc16is752_devtype, },
1260 { .compatible = "nxp,sc16is760", .data = &sc16is760_devtype, },
1261 { .compatible = "nxp,sc16is762", .data = &sc16is762_devtype, },
1264 MODULE_DEVICE_TABLE(of, sc16is7xx_dt_ids);
1266 static struct regmap_config regcfg = {
1270 .cache_type = REGCACHE_RBTREE,
1271 .volatile_reg = sc16is7xx_regmap_volatile,
1272 .precious_reg = sc16is7xx_regmap_precious,
1275 #ifdef CONFIG_SERIAL_SC16IS7XX_SPI
1276 static int sc16is7xx_spi_probe(struct spi_device *spi)
1278 struct sc16is7xx_devtype *devtype;
1279 unsigned long flags = 0;
1280 struct regmap *regmap;
1284 spi->bits_per_word = 8;
1285 /* only supports mode 0 on SC16IS762 */
1286 spi->mode = spi->mode ? : SPI_MODE_0;
1287 spi->max_speed_hz = spi->max_speed_hz ? : 15000000;
1288 ret = spi_setup(spi);
1292 if (spi->dev.of_node) {
1293 const struct of_device_id *of_id =
1294 of_match_device(sc16is7xx_dt_ids, &spi->dev);
1296 devtype = (struct sc16is7xx_devtype *)of_id->data;
1298 const struct spi_device_id *id_entry = spi_get_device_id(spi);
1300 devtype = (struct sc16is7xx_devtype *)id_entry->driver_data;
1301 flags = IRQF_TRIGGER_FALLING;
1304 regcfg.max_register = (0xf << SC16IS7XX_REG_SHIFT) |
1305 (devtype->nr_uart - 1);
1306 regmap = devm_regmap_init_spi(spi, ®cfg);
1308 return sc16is7xx_probe(&spi->dev, devtype, regmap, spi->irq, flags);
1311 static int sc16is7xx_spi_remove(struct spi_device *spi)
1313 return sc16is7xx_remove(&spi->dev);
1316 static const struct spi_device_id sc16is7xx_spi_id_table[] = {
1317 { "sc16is74x", (kernel_ulong_t)&sc16is74x_devtype, },
1318 { "sc16is740", (kernel_ulong_t)&sc16is74x_devtype, },
1319 { "sc16is741", (kernel_ulong_t)&sc16is74x_devtype, },
1320 { "sc16is750", (kernel_ulong_t)&sc16is750_devtype, },
1321 { "sc16is752", (kernel_ulong_t)&sc16is752_devtype, },
1322 { "sc16is760", (kernel_ulong_t)&sc16is760_devtype, },
1323 { "sc16is762", (kernel_ulong_t)&sc16is762_devtype, },
1327 MODULE_DEVICE_TABLE(spi, sc16is7xx_spi_id_table);
1329 static struct spi_driver sc16is7xx_spi_uart_driver = {
1331 .name = SC16IS7XX_NAME,
1332 .owner = THIS_MODULE,
1333 .of_match_table = of_match_ptr(sc16is7xx_dt_ids),
1335 .probe = sc16is7xx_spi_probe,
1336 .remove = sc16is7xx_spi_remove,
1337 .id_table = sc16is7xx_spi_id_table,
1340 MODULE_ALIAS("spi:sc16is7xx");
1343 #ifdef CONFIG_SERIAL_SC16IS7XX_I2C
1344 static int sc16is7xx_i2c_probe(struct i2c_client *i2c,
1345 const struct i2c_device_id *id)
1347 struct sc16is7xx_devtype *devtype;
1348 unsigned long flags = 0;
1349 struct regmap *regmap;
1351 if (i2c->dev.of_node) {
1352 const struct of_device_id *of_id =
1353 of_match_device(sc16is7xx_dt_ids, &i2c->dev);
1355 devtype = (struct sc16is7xx_devtype *)of_id->data;
1357 devtype = (struct sc16is7xx_devtype *)id->driver_data;
1358 flags = IRQF_TRIGGER_FALLING;
1361 regcfg.max_register = (0xf << SC16IS7XX_REG_SHIFT) |
1362 (devtype->nr_uart - 1);
1363 regmap = devm_regmap_init_i2c(i2c, ®cfg);
1365 return sc16is7xx_probe(&i2c->dev, devtype, regmap, i2c->irq, flags);
1368 static int sc16is7xx_i2c_remove(struct i2c_client *client)
1370 return sc16is7xx_remove(&client->dev);
1373 static const struct i2c_device_id sc16is7xx_i2c_id_table[] = {
1374 { "sc16is74x", (kernel_ulong_t)&sc16is74x_devtype, },
1375 { "sc16is740", (kernel_ulong_t)&sc16is74x_devtype, },
1376 { "sc16is741", (kernel_ulong_t)&sc16is74x_devtype, },
1377 { "sc16is750", (kernel_ulong_t)&sc16is750_devtype, },
1378 { "sc16is752", (kernel_ulong_t)&sc16is752_devtype, },
1379 { "sc16is760", (kernel_ulong_t)&sc16is760_devtype, },
1380 { "sc16is762", (kernel_ulong_t)&sc16is762_devtype, },
1383 MODULE_DEVICE_TABLE(i2c, sc16is7xx_i2c_id_table);
1385 static struct i2c_driver sc16is7xx_i2c_uart_driver = {
1387 .name = SC16IS7XX_NAME,
1388 .owner = THIS_MODULE,
1389 .of_match_table = of_match_ptr(sc16is7xx_dt_ids),
1391 .probe = sc16is7xx_i2c_probe,
1392 .remove = sc16is7xx_i2c_remove,
1393 .id_table = sc16is7xx_i2c_id_table,
1396 MODULE_ALIAS("i2c:sc16is7xx");
1399 static int __init sc16is7xx_init(void)
1402 #ifdef CONFIG_SERIAL_SC16IS7XX_I2C
1403 ret = i2c_add_driver(&sc16is7xx_i2c_uart_driver);
1405 pr_err("failed to init sc16is7xx i2c --> %d\n", ret);
1410 #ifdef CONFIG_SERIAL_SC16IS7XX_SPI
1411 ret = spi_register_driver(&sc16is7xx_spi_uart_driver);
1413 pr_err("failed to init sc16is7xx spi --> %d\n", ret);
1419 module_init(sc16is7xx_init);
1421 static void __exit sc16is7xx_exit(void)
1423 #ifdef CONFIG_SERIAL_SC16IS7XX_I2C
1424 i2c_del_driver(&sc16is7xx_i2c_uart_driver);
1427 #ifdef CONFIG_SERIAL_SC16IS7XX_SPI
1428 spi_unregister_driver(&sc16is7xx_spi_uart_driver);
1431 module_exit(sc16is7xx_exit);
1433 MODULE_LICENSE("GPL");
1434 MODULE_AUTHOR("Jon Ringle <jringle@gridpoint.com>");
1435 MODULE_DESCRIPTION("SC16IS7XX serial driver");