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Thomas Gleixnera10e7632019-05-31 01:09:32 -07001// SPDX-License-Identifier: GPL-2.0-only
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/* ------------------------------------------------------------------------- */
3/* i2c-iop3xx.c i2c driver algorithms for Intel XScale IOP3xx & IXP46x */
4/* ------------------------------------------------------------------------- */
5/* Copyright (C) 2003 Peter Milne, D-TACQ Solutions Ltd
6 * <Peter dot Milne at D hyphen TACQ dot com>
7 *
Rob Herring67ac88f2012-07-04 14:14:16 -05008 * With acknowledgements to i2c-algo-ibm_ocp.c by
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * Ian DaSilva, MontaVista Software, Inc. idasilva@mvista.com
10 *
11 * And i2c-algo-pcf.c, which was created by Simon G. Vogl and Hans Berglund:
12 *
13 * Copyright (C) 1995-1997 Simon G. Vogl, 1998-2000 Hans Berglund
Rob Herring67ac88f2012-07-04 14:14:16 -050014 *
Dan Williamsfbd9a6d2005-11-01 22:31:12 +000015 * And which acknowledged Kyösti Mälkki <kmalkki@cc.hut.fi>,
Linus Torvalds1da177e2005-04-16 15:20:36 -070016 * Frodo Looijaard <frodol@dds.nl>, Martin Bailey<mbailey@littlefeet-inc.com>
17 *
18 * Major cleanup by Deepak Saxena <dsaxena@plexity.net>, 01/2005:
19 *
20 * - Use driver model to pass per-chip info instead of hardcoding and #ifdefs
21 * - Use ioremap/__raw_readl/__raw_writel instead of direct dereference
22 * - Make it work with IXP46x chips
23 * - Cleanup function names, coding style, etc
24 *
Peter Milne39288e12006-07-01 17:03:20 +020025 * - writing to slave address causes latchup on iop331.
26 * fix: driver refuses to address self.
Linus Torvalds1da177e2005-04-16 15:20:36 -070027 */
28
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/interrupt.h>
30#include <linux/kernel.h>
31#include <linux/module.h>
32#include <linux/delay.h>
33#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <linux/errno.h>
Russell Kingd052d1b2005-10-29 19:07:23 +010035#include <linux/platform_device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <linux/i2c.h>
H Hartley Sweeten21782182010-05-21 18:41:01 +020037#include <linux/io.h>
Linus Walleijfdb7e882019-06-01 00:37:56 +020038#include <linux/gpio/consumer.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
40#include "i2c-iop3xx.h"
41
42/* global unit counter */
Jean Delvare60507092005-09-25 16:23:07 +020043static int i2c_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
Rob Herring67ac88f2012-07-04 14:14:16 -050045static inline unsigned char
46iic_cook_addr(struct i2c_msg *msg)
Linus Torvalds1da177e2005-04-16 15:20:36 -070047{
48 unsigned char addr;
49
Wolfram Sang515e2402016-04-03 20:44:53 +020050 addr = i2c_8bit_addr_from_msg(msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Rob Herring67ac88f2012-07-04 14:14:16 -050052 return addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053}
54
Rob Herring67ac88f2012-07-04 14:14:16 -050055static void
Linus Torvalds1da177e2005-04-16 15:20:36 -070056iop3xx_i2c_reset(struct i2c_algo_iop3xx_data *iop3xx_adap)
57{
58 /* Follows devman 9.3 */
59 __raw_writel(IOP3XX_ICR_UNIT_RESET, iop3xx_adap->ioaddr + CR_OFFSET);
60 __raw_writel(IOP3XX_ISR_CLEARBITS, iop3xx_adap->ioaddr + SR_OFFSET);
61 __raw_writel(0, iop3xx_adap->ioaddr + CR_OFFSET);
Rob Herring67ac88f2012-07-04 14:14:16 -050062}
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
Rob Herring67ac88f2012-07-04 14:14:16 -050064static void
Linus Torvalds1da177e2005-04-16 15:20:36 -070065iop3xx_i2c_enable(struct i2c_algo_iop3xx_data *iop3xx_adap)
66{
67 u32 cr = IOP3XX_ICR_GCD | IOP3XX_ICR_SCLEN | IOP3XX_ICR_UE;
68
Rob Herring67ac88f2012-07-04 14:14:16 -050069 /*
Steven Cole44bbe872005-05-03 18:21:25 -060070 * Every time unit enable is asserted, GPOD needs to be cleared
Linus Walleijfdb7e882019-06-01 00:37:56 +020071 * on IOP3XX to avoid data corruption on the bus. We use the
72 * gpiod_set_raw_value() to make sure the 0 hits the hardware
73 * GPOD register. These descriptors are only passed along to
74 * the device if this is necessary.
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 */
Linus Walleijfdb7e882019-06-01 00:37:56 +020076 if (iop3xx_adap->gpio_scl)
77 gpiod_set_raw_value(iop3xx_adap->gpio_scl, 0);
78 if (iop3xx_adap->gpio_sda)
79 gpiod_set_raw_value(iop3xx_adap->gpio_sda, 0);
80
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 /* NB SR bits not same position as CR IE bits :-( */
Rob Herring67ac88f2012-07-04 14:14:16 -050082 iop3xx_adap->SR_enabled =
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 IOP3XX_ISR_ALD | IOP3XX_ISR_BERRD |
84 IOP3XX_ISR_RXFULL | IOP3XX_ISR_TXEMPTY;
85
86 cr |= IOP3XX_ICR_ALD_IE | IOP3XX_ICR_BERR_IE |
87 IOP3XX_ICR_RXFULL_IE | IOP3XX_ICR_TXEMPTY_IE;
88
89 __raw_writel(cr, iop3xx_adap->ioaddr + CR_OFFSET);
90}
91
Rob Herring67ac88f2012-07-04 14:14:16 -050092static void
Linus Torvalds1da177e2005-04-16 15:20:36 -070093iop3xx_i2c_transaction_cleanup(struct i2c_algo_iop3xx_data *iop3xx_adap)
94{
95 unsigned long cr = __raw_readl(iop3xx_adap->ioaddr + CR_OFFSET);
Rob Herring67ac88f2012-07-04 14:14:16 -050096
97 cr &= ~(IOP3XX_ICR_MSTART | IOP3XX_ICR_TBYTE |
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 IOP3XX_ICR_MSTOP | IOP3XX_ICR_SCLEN);
99
100 __raw_writel(cr, iop3xx_adap->ioaddr + CR_OFFSET);
101}
102
Rob Herring67ac88f2012-07-04 14:14:16 -0500103/*
104 * NB: the handler has to clear the source of the interrupt!
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 * Then it passes the SR flags of interest to BH via adap data
106 */
Rob Herring67ac88f2012-07-04 14:14:16 -0500107static irqreturn_t
108iop3xx_i2c_irq_handler(int this_irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109{
110 struct i2c_algo_iop3xx_data *iop3xx_adap = dev_id;
111 u32 sr = __raw_readl(iop3xx_adap->ioaddr + SR_OFFSET);
112
113 if ((sr &= iop3xx_adap->SR_enabled)) {
114 __raw_writel(sr, iop3xx_adap->ioaddr + SR_OFFSET);
115 iop3xx_adap->SR_received |= sr;
116 wake_up_interruptible(&iop3xx_adap->waitq);
117 }
118 return IRQ_HANDLED;
119}
120
121/* check all error conditions, clear them , report most important */
Rob Herring67ac88f2012-07-04 14:14:16 -0500122static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123iop3xx_i2c_error(u32 sr)
124{
125 int rc = 0;
126
127 if ((sr & IOP3XX_ISR_BERRD)) {
Tian Tao87c2de52021-04-05 17:03:49 +0800128 if (!rc)
129 rc = -I2C_ERR_BERR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 }
131 if ((sr & IOP3XX_ISR_ALD)) {
Tian Tao87c2de52021-04-05 17:03:49 +0800132 if (!rc)
133 rc = -I2C_ERR_ALD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 }
Rob Herring67ac88f2012-07-04 14:14:16 -0500135 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136}
137
Rob Herring67ac88f2012-07-04 14:14:16 -0500138static inline u32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139iop3xx_i2c_get_srstat(struct i2c_algo_iop3xx_data *iop3xx_adap)
140{
141 unsigned long flags;
142 u32 sr;
143
144 spin_lock_irqsave(&iop3xx_adap->lock, flags);
145 sr = iop3xx_adap->SR_received;
146 iop3xx_adap->SR_received = 0;
147 spin_unlock_irqrestore(&iop3xx_adap->lock, flags);
148
149 return sr;
150}
151
152/*
153 * sleep until interrupted, then recover and analyse the SR
154 * saved by handler
155 */
Tian Tao87c2de52021-04-05 17:03:49 +0800156typedef int (*compare_func)(unsigned test, unsigned mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157/* returns 1 on correct comparison */
158
Rob Herring67ac88f2012-07-04 14:14:16 -0500159static int
160iop3xx_i2c_wait_event(struct i2c_algo_iop3xx_data *iop3xx_adap,
Tian Tao87c2de52021-04-05 17:03:49 +0800161 unsigned flags, unsigned *status,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 compare_func compare)
163{
164 unsigned sr = 0;
165 int interrupted;
166 int done;
167 int rc = 0;
168
169 do {
170 interrupted = wait_event_interruptible_timeout (
171 iop3xx_adap->waitq,
Tian Tao87c2de52021-04-05 17:03:49 +0800172 (done = compare(sr = iop3xx_i2c_get_srstat(iop3xx_adap), flags)),
Kevin Hilman88a8e4a2013-06-28 14:35:52 -0700173 1 * HZ
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 );
175 if ((rc = iop3xx_i2c_error(sr)) < 0) {
176 *status = sr;
177 return rc;
178 } else if (!interrupted) {
179 *status = sr;
180 return -ETIMEDOUT;
181 }
Tian Tao87c2de52021-04-05 17:03:49 +0800182 } while (!done);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
184 *status = sr;
185
186 return 0;
187}
188
189/*
Rob Herring67ac88f2012-07-04 14:14:16 -0500190 * Concrete compare_funcs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 */
Rob Herring67ac88f2012-07-04 14:14:16 -0500192static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193all_bits_clear(unsigned test, unsigned mask)
194{
195 return (test & mask) == 0;
196}
197
Rob Herring67ac88f2012-07-04 14:14:16 -0500198static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199any_bits_set(unsigned test, unsigned mask)
200{
201 return (test & mask) != 0;
202}
203
Rob Herring67ac88f2012-07-04 14:14:16 -0500204static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205iop3xx_i2c_wait_tx_done(struct i2c_algo_iop3xx_data *iop3xx_adap, int *status)
206{
Rob Herring67ac88f2012-07-04 14:14:16 -0500207 return iop3xx_i2c_wait_event(
208 iop3xx_adap,
Tian Tao87c2de52021-04-05 17:03:49 +0800209 IOP3XX_ISR_TXEMPTY | IOP3XX_ISR_ALD | IOP3XX_ISR_BERRD,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 status, any_bits_set);
211}
212
Rob Herring67ac88f2012-07-04 14:14:16 -0500213static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214iop3xx_i2c_wait_rx_done(struct i2c_algo_iop3xx_data *iop3xx_adap, int *status)
215{
Rob Herring67ac88f2012-07-04 14:14:16 -0500216 return iop3xx_i2c_wait_event(
217 iop3xx_adap,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 IOP3XX_ISR_RXFULL | IOP3XX_ISR_ALD | IOP3XX_ISR_BERRD,
219 status, any_bits_set);
220}
221
Rob Herring67ac88f2012-07-04 14:14:16 -0500222static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223iop3xx_i2c_wait_idle(struct i2c_algo_iop3xx_data *iop3xx_adap, int *status)
224{
Rob Herring67ac88f2012-07-04 14:14:16 -0500225 return iop3xx_i2c_wait_event(
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 iop3xx_adap, IOP3XX_ISR_UNITBUSY, status, all_bits_clear);
227}
228
Rob Herring67ac88f2012-07-04 14:14:16 -0500229static int
230iop3xx_i2c_send_target_addr(struct i2c_algo_iop3xx_data *iop3xx_adap,
Tian Tao87c2de52021-04-05 17:03:49 +0800231 struct i2c_msg *msg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232{
233 unsigned long cr = __raw_readl(iop3xx_adap->ioaddr + CR_OFFSET);
234 int status;
235 int rc;
236
Peter Milne39288e12006-07-01 17:03:20 +0200237 /* avoid writing to my slave address (hangs on 80331),
238 * forbidden in Intel developer manual
239 */
240 if (msg->addr == MYSAR) {
241 return -EBUSY;
242 }
243
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 __raw_writel(iic_cook_addr(msg), iop3xx_adap->ioaddr + DBR_OFFSET);
Rob Herring67ac88f2012-07-04 14:14:16 -0500245
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 cr &= ~(IOP3XX_ICR_MSTOP | IOP3XX_ICR_NACK);
247 cr |= IOP3XX_ICR_MSTART | IOP3XX_ICR_TBYTE;
248
249 __raw_writel(cr, iop3xx_adap->ioaddr + CR_OFFSET);
250 rc = iop3xx_i2c_wait_tx_done(iop3xx_adap, &status);
251
252 return rc;
253}
254
Rob Herring67ac88f2012-07-04 14:14:16 -0500255static int
256iop3xx_i2c_write_byte(struct i2c_algo_iop3xx_data *iop3xx_adap, char byte,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 int stop)
258{
259 unsigned long cr = __raw_readl(iop3xx_adap->ioaddr + CR_OFFSET);
260 int status;
261 int rc = 0;
262
263 __raw_writel(byte, iop3xx_adap->ioaddr + DBR_OFFSET);
264 cr &= ~IOP3XX_ICR_MSTART;
265 if (stop) {
266 cr |= IOP3XX_ICR_MSTOP;
267 } else {
268 cr &= ~IOP3XX_ICR_MSTOP;
269 }
270 cr |= IOP3XX_ICR_TBYTE;
271 __raw_writel(cr, iop3xx_adap->ioaddr + CR_OFFSET);
272 rc = iop3xx_i2c_wait_tx_done(iop3xx_adap, &status);
273
274 return rc;
Rob Herring67ac88f2012-07-04 14:14:16 -0500275}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276
Rob Herring67ac88f2012-07-04 14:14:16 -0500277static int
Tian Tao87c2de52021-04-05 17:03:49 +0800278iop3xx_i2c_read_byte(struct i2c_algo_iop3xx_data *iop3xx_adap, char *byte,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 int stop)
280{
281 unsigned long cr = __raw_readl(iop3xx_adap->ioaddr + CR_OFFSET);
282 int status;
283 int rc = 0;
284
285 cr &= ~IOP3XX_ICR_MSTART;
286
287 if (stop) {
288 cr |= IOP3XX_ICR_MSTOP | IOP3XX_ICR_NACK;
289 } else {
290 cr &= ~(IOP3XX_ICR_MSTOP | IOP3XX_ICR_NACK);
291 }
292 cr |= IOP3XX_ICR_TBYTE;
293 __raw_writel(cr, iop3xx_adap->ioaddr + CR_OFFSET);
294
295 rc = iop3xx_i2c_wait_rx_done(iop3xx_adap, &status);
296
297 *byte = __raw_readl(iop3xx_adap->ioaddr + DBR_OFFSET);
298
299 return rc;
300}
301
Rob Herring67ac88f2012-07-04 14:14:16 -0500302static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303iop3xx_i2c_writebytes(struct i2c_adapter *i2c_adap, const char *buf, int count)
304{
305 struct i2c_algo_iop3xx_data *iop3xx_adap = i2c_adap->algo_data;
306 int ii;
307 int rc = 0;
308
Rob Herring67ac88f2012-07-04 14:14:16 -0500309 for (ii = 0; rc == 0 && ii != count; ++ii)
Tian Tao87c2de52021-04-05 17:03:49 +0800310 rc = iop3xx_i2c_write_byte(iop3xx_adap, buf[ii], ii == count-1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 return rc;
312}
313
Rob Herring67ac88f2012-07-04 14:14:16 -0500314static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315iop3xx_i2c_readbytes(struct i2c_adapter *i2c_adap, char *buf, int count)
316{
317 struct i2c_algo_iop3xx_data *iop3xx_adap = i2c_adap->algo_data;
318 int ii;
319 int rc = 0;
320
321 for (ii = 0; rc == 0 && ii != count; ++ii)
Tian Tao87c2de52021-04-05 17:03:49 +0800322 rc = iop3xx_i2c_read_byte(iop3xx_adap, &buf[ii], ii == count-1);
Rob Herring67ac88f2012-07-04 14:14:16 -0500323
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 return rc;
325}
326
327/*
328 * Description: This function implements combined transactions. Combined
329 * transactions consist of combinations of reading and writing blocks of data.
330 * FROM THE SAME ADDRESS
331 * Each transfer (i.e. a read or a write) is separated by a repeated start
332 * condition.
333 */
Rob Herring67ac88f2012-07-04 14:14:16 -0500334static int
Tian Tao87c2de52021-04-05 17:03:49 +0800335iop3xx_i2c_handle_msg(struct i2c_adapter *i2c_adap, struct i2c_msg *pmsg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336{
337 struct i2c_algo_iop3xx_data *iop3xx_adap = i2c_adap->algo_data;
338 int rc;
339
340 rc = iop3xx_i2c_send_target_addr(iop3xx_adap, pmsg);
341 if (rc < 0) {
342 return rc;
343 }
344
345 if ((pmsg->flags&I2C_M_RD)) {
346 return iop3xx_i2c_readbytes(i2c_adap, pmsg->buf, pmsg->len);
347 } else {
348 return iop3xx_i2c_writebytes(i2c_adap, pmsg->buf, pmsg->len);
349 }
350}
351
352/*
353 * master_xfer() - main read/write entry
354 */
Rob Herring67ac88f2012-07-04 14:14:16 -0500355static int
356iop3xx_i2c_master_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 int num)
358{
359 struct i2c_algo_iop3xx_data *iop3xx_adap = i2c_adap->algo_data;
360 int im = 0;
361 int ret = 0;
362 int status;
363
364 iop3xx_i2c_wait_idle(iop3xx_adap, &status);
365 iop3xx_i2c_reset(iop3xx_adap);
366 iop3xx_i2c_enable(iop3xx_adap);
367
368 for (im = 0; ret == 0 && im != num; im++) {
369 ret = iop3xx_i2c_handle_msg(i2c_adap, &msgs[im]);
370 }
371
372 iop3xx_i2c_transaction_cleanup(iop3xx_adap);
Rob Herring67ac88f2012-07-04 14:14:16 -0500373
Tian Tao87c2de52021-04-05 17:03:49 +0800374 if (ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 return ret;
376
Rob Herring67ac88f2012-07-04 14:14:16 -0500377 return im;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378}
379
Rob Herring67ac88f2012-07-04 14:14:16 -0500380static u32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381iop3xx_i2c_func(struct i2c_adapter *adap)
382{
383 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
384}
385
Jean Delvare8f9082c2006-09-03 22:39:46 +0200386static const struct i2c_algorithm iop3xx_i2c_algo = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 .master_xfer = iop3xx_i2c_master_xfer,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 .functionality = iop3xx_i2c_func,
389};
390
Rob Herring67ac88f2012-07-04 14:14:16 -0500391static int
Russell King3ae5eae2005-11-09 22:32:44 +0000392iop3xx_i2c_remove(struct platform_device *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393{
Russell King3ae5eae2005-11-09 22:32:44 +0000394 struct i2c_adapter *padapter = platform_get_drvdata(pdev);
Rob Herring67ac88f2012-07-04 14:14:16 -0500395 struct i2c_algo_iop3xx_data *adapter_data =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 (struct i2c_algo_iop3xx_data *)padapter->algo_data;
397 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
398 unsigned long cr = __raw_readl(adapter_data->ioaddr + CR_OFFSET);
399
400 /*
401 * Disable the actual HW unit
402 */
403 cr &= ~(IOP3XX_ICR_ALD_IE | IOP3XX_ICR_BERR_IE |
404 IOP3XX_ICR_RXFULL_IE | IOP3XX_ICR_TXEMPTY_IE);
405 __raw_writel(cr, adapter_data->ioaddr + CR_OFFSET);
406
Aaro Koskinen747fcc92010-11-29 12:33:39 +0200407 iounmap(adapter_data->ioaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 release_mem_region(res->start, IOP3XX_I2C_IO_SIZE);
409 kfree(adapter_data);
410 kfree(padapter);
411
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 return 0;
413}
414
Rob Herring67ac88f2012-07-04 14:14:16 -0500415static int
Russell King3ae5eae2005-11-09 22:32:44 +0000416iop3xx_i2c_probe(struct platform_device *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 struct resource *res;
David Vrabel48944732006-01-19 17:56:29 +0000419 int ret, irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 struct i2c_adapter *new_adapter;
421 struct i2c_algo_iop3xx_data *adapter_data;
422
Deepak Saxena5263ebb2005-10-17 23:09:43 +0200423 new_adapter = kzalloc(sizeof(struct i2c_adapter), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 if (!new_adapter) {
425 ret = -ENOMEM;
426 goto out;
427 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428
Deepak Saxena5263ebb2005-10-17 23:09:43 +0200429 adapter_data = kzalloc(sizeof(struct i2c_algo_iop3xx_data), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 if (!adapter_data) {
431 ret = -ENOMEM;
432 goto free_adapter;
433 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434
Linus Walleijfdb7e882019-06-01 00:37:56 +0200435 adapter_data->gpio_scl = devm_gpiod_get_optional(&pdev->dev,
436 "scl",
437 GPIOD_ASIS);
Krzysztof Kozlowskie6417572020-01-13 18:29:54 +0100438 if (IS_ERR(adapter_data->gpio_scl)) {
439 ret = PTR_ERR(adapter_data->gpio_scl);
440 goto free_both;
441 }
Linus Walleijfdb7e882019-06-01 00:37:56 +0200442 adapter_data->gpio_sda = devm_gpiod_get_optional(&pdev->dev,
443 "sda",
444 GPIOD_ASIS);
Krzysztof Kozlowskie6417572020-01-13 18:29:54 +0100445 if (IS_ERR(adapter_data->gpio_sda)) {
446 ret = PTR_ERR(adapter_data->gpio_sda);
447 goto free_both;
448 }
Linus Walleijfdb7e882019-06-01 00:37:56 +0200449
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
451 if (!res) {
452 ret = -ENODEV;
453 goto free_both;
454 }
455
456 if (!request_mem_region(res->start, IOP3XX_I2C_IO_SIZE, pdev->name)) {
457 ret = -EBUSY;
458 goto free_both;
459 }
460
461 /* set the adapter enumeration # */
462 adapter_data->id = i2c_id++;
463
Aaro Koskinen747fcc92010-11-29 12:33:39 +0200464 adapter_data->ioaddr = ioremap(res->start, IOP3XX_I2C_IO_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 if (!adapter_data->ioaddr) {
466 ret = -ENOMEM;
467 goto release_region;
468 }
469
David Vrabel48944732006-01-19 17:56:29 +0000470 irq = platform_get_irq(pdev, 0);
471 if (irq < 0) {
472 ret = -ENXIO;
473 goto unmap;
474 }
475 ret = request_irq(irq, iop3xx_i2c_irq_handler, 0,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 pdev->name, adapter_data);
Dan Williamsfbd9a6d2005-11-01 22:31:12 +0000477
478 if (ret) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 ret = -EIO;
480 goto unmap;
481 }
482
483 memcpy(new_adapter->name, pdev->name, strlen(pdev->name));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 new_adapter->owner = THIS_MODULE;
Jean Delvare3401b2f2008-07-14 22:38:29 +0200485 new_adapter->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 new_adapter->dev.parent = &pdev->dev;
Linus Walleijcac28ac2019-01-28 23:25:34 +0100487 new_adapter->dev.of_node = pdev->dev.of_node;
Martin Michlmayr757ba4c2007-07-12 14:12:30 +0200488 new_adapter->nr = pdev->id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489
490 /*
491 * Default values...should these come in from board code?
492 */
Jean Delvare8a52c6b2009-03-28 21:34:43 +0100493 new_adapter->timeout = HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 new_adapter->algo = &iop3xx_i2c_algo;
495
496 init_waitqueue_head(&adapter_data->waitq);
497 spin_lock_init(&adapter_data->lock);
498
499 iop3xx_i2c_reset(adapter_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 iop3xx_i2c_enable(adapter_data);
501
Russell King3ae5eae2005-11-09 22:32:44 +0000502 platform_set_drvdata(pdev, new_adapter);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 new_adapter->algo_data = adapter_data;
504
Martin Michlmayr757ba4c2007-07-12 14:12:30 +0200505 i2c_add_numbered_adapter(new_adapter);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506
507 return 0;
508
509unmap:
Aaro Koskinen747fcc92010-11-29 12:33:39 +0200510 iounmap(adapter_data->ioaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511
512release_region:
513 release_mem_region(res->start, IOP3XX_I2C_IO_SIZE);
514
515free_both:
516 kfree(adapter_data);
517
518free_adapter:
519 kfree(new_adapter);
520
521out:
522 return ret;
523}
524
Linus Walleijcac28ac2019-01-28 23:25:34 +0100525static const struct of_device_id i2c_iop3xx_match[] = {
526 { .compatible = "intel,iop3xx-i2c", },
527 { .compatible = "intel,ixp4xx-i2c", },
528 {},
529};
530MODULE_DEVICE_TABLE(of, i2c_iop3xx_match);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531
Russell King3ae5eae2005-11-09 22:32:44 +0000532static struct platform_driver iop3xx_i2c_driver = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 .probe = iop3xx_i2c_probe,
Russell King3ae5eae2005-11-09 22:32:44 +0000534 .remove = iop3xx_i2c_remove,
535 .driver = {
Russell King3ae5eae2005-11-09 22:32:44 +0000536 .name = "IOP3xx-I2C",
Linus Walleijcac28ac2019-01-28 23:25:34 +0100537 .of_match_table = i2c_iop3xx_match,
Russell King3ae5eae2005-11-09 22:32:44 +0000538 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539};
540
Axel Lina3664b52012-01-12 20:32:04 +0100541module_platform_driver(iop3xx_i2c_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
543MODULE_AUTHOR("D-TACQ Solutions Ltd <www.d-tacq.com>");
544MODULE_DESCRIPTION("IOP3xx iic algorithm and driver");
545MODULE_LICENSE("GPL");
Kay Sieversadd8eda2008-04-22 22:16:49 +0200546MODULE_ALIAS("platform:IOP3xx-I2C");