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Magnus Dammda672772008-04-22 22:16:49 +02001/*
2 * SuperH Mobile I2C Controller
3 *
Wolfram Sang2d095812014-11-07 11:11:41 +01004 * Copyright (C) 2014 Wolfram Sang <wsa@sang-engineering.com>
5 *
Magnus Dammda672772008-04-22 22:16:49 +02006 * Copyright (C) 2008 Magnus Damm
7 *
8 * Portions of the code based on out-of-tree driver i2c-sh7343.c
9 * Copyright (c) 2006 Carlos Munoz <carlos@kenati.com>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
Magnus Dammda672772008-04-22 22:16:49 +020019 */
20
Wolfram Sang5bbe6872014-11-07 11:11:40 +010021#include <linux/clk.h>
22#include <linux/delay.h>
Wolfram Sang2d095812014-11-07 11:11:41 +010023#include <linux/dmaengine.h>
24#include <linux/dma-mapping.h>
Wolfram Sang5bbe6872014-11-07 11:11:40 +010025#include <linux/err.h>
26#include <linux/i2c.h>
Wolfram Sang5bbe6872014-11-07 11:11:40 +010027#include <linux/init.h>
28#include <linux/interrupt.h>
29#include <linux/io.h>
Magnus Dammda672772008-04-22 22:16:49 +020030#include <linux/kernel.h>
31#include <linux/module.h>
Wolfram Sang67240df2014-05-02 21:15:16 +020032#include <linux/of_device.h>
Wolfram Sang5bbe6872014-11-07 11:11:40 +010033#include <linux/platform_device.h>
34#include <linux/pm_runtime.h>
35#include <linux/slab.h>
Magnus Dammda672772008-04-22 22:16:49 +020036
Magnus Damm4eb00c92008-08-27 18:33:56 +090037/* Transmit operation: */
38/* */
39/* 0 byte transmit */
Guennadi Liakhovetskie7890292013-01-17 10:45:57 +010040/* BUS: S A8 ACK P(*) */
Magnus Damm4eb00c92008-08-27 18:33:56 +090041/* IRQ: DTE WAIT */
42/* ICIC: */
43/* ICCR: 0x94 0x90 */
44/* ICDR: A8 */
45/* */
46/* 1 byte transmit */
Guennadi Liakhovetskie7890292013-01-17 10:45:57 +010047/* BUS: S A8 ACK D8(1) ACK P(*) */
Magnus Damm4eb00c92008-08-27 18:33:56 +090048/* IRQ: DTE WAIT WAIT */
49/* ICIC: -DTE */
50/* ICCR: 0x94 0x90 */
51/* ICDR: A8 D8(1) */
52/* */
53/* 2 byte transmit */
Guennadi Liakhovetskie7890292013-01-17 10:45:57 +010054/* BUS: S A8 ACK D8(1) ACK D8(2) ACK P(*) */
Magnus Damm4eb00c92008-08-27 18:33:56 +090055/* IRQ: DTE WAIT WAIT WAIT */
56/* ICIC: -DTE */
57/* ICCR: 0x94 0x90 */
58/* ICDR: A8 D8(1) D8(2) */
59/* */
60/* 3 bytes or more, +---------+ gets repeated */
61/* */
62/* */
63/* Receive operation: */
64/* */
65/* 0 byte receive - not supported since slave may hold SDA low */
66/* */
67/* 1 byte receive [TX] | [RX] */
Guennadi Liakhovetskie7890292013-01-17 10:45:57 +010068/* BUS: S A8 ACK | D8(1) ACK P(*) */
Magnus Damm4eb00c92008-08-27 18:33:56 +090069/* IRQ: DTE WAIT | WAIT DTE */
70/* ICIC: -DTE | +DTE */
71/* ICCR: 0x94 0x81 | 0xc0 */
72/* ICDR: A8 | D8(1) */
73/* */
74/* 2 byte receive [TX]| [RX] */
Guennadi Liakhovetskie7890292013-01-17 10:45:57 +010075/* BUS: S A8 ACK | D8(1) ACK D8(2) ACK P(*) */
Magnus Damm4eb00c92008-08-27 18:33:56 +090076/* IRQ: DTE WAIT | WAIT WAIT DTE */
77/* ICIC: -DTE | +DTE */
78/* ICCR: 0x94 0x81 | 0xc0 */
79/* ICDR: A8 | D8(1) D8(2) */
80/* */
Guennadi Liakhovetskie7890292013-01-17 10:45:57 +010081/* 3 byte receive [TX] | [RX] (*) */
Magnus Damm4eb00c92008-08-27 18:33:56 +090082/* BUS: S A8 ACK | D8(1) ACK D8(2) ACK D8(3) ACK P */
83/* IRQ: DTE WAIT | WAIT WAIT WAIT DTE */
84/* ICIC: -DTE | +DTE */
85/* ICCR: 0x94 0x81 | 0xc0 */
86/* ICDR: A8 | D8(1) D8(2) D8(3) */
87/* */
88/* 4 bytes or more, this part is repeated +---------+ */
89/* */
90/* */
91/* Interrupt order and BUSY flag */
92/* ___ _ */
93/* SDA ___\___XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXAAAAAAAAA___/ */
94/* SCL \_/1\_/2\_/3\_/4\_/5\_/6\_/7\_/8\___/9\_____/ */
95/* */
Guennadi Liakhovetskie7890292013-01-17 10:45:57 +010096/* S D7 D6 D5 D4 D3 D2 D1 D0 P(*) */
Magnus Damm4eb00c92008-08-27 18:33:56 +090097/* ___ */
98/* WAIT IRQ ________________________________/ \___________ */
99/* TACK IRQ ____________________________________/ \_______ */
100/* DTE IRQ __________________________________________/ \_ */
101/* AL IRQ XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */
102/* _______________________________________________ */
103/* BUSY __/ \_ */
104/* */
Guennadi Liakhovetskie7890292013-01-17 10:45:57 +0100105/* (*) The STOP condition is only sent by the master at the end of the last */
106/* I2C message or if the I2C_M_STOP flag is set. Similarly, the BUSY bit is */
107/* only cleared after the STOP condition, so, between messages we have to */
108/* poll for the DTE bit. */
109/* */
Magnus Damm4eb00c92008-08-27 18:33:56 +0900110
Magnus Dammda672772008-04-22 22:16:49 +0200111enum sh_mobile_i2c_op {
112 OP_START = 0,
Magnus Damm4eb00c92008-08-27 18:33:56 +0900113 OP_TX_FIRST,
114 OP_TX,
Magnus Dammda672772008-04-22 22:16:49 +0200115 OP_TX_STOP,
Wolfram Sang2d095812014-11-07 11:11:41 +0100116 OP_TX_STOP_DATA,
Magnus Dammda672772008-04-22 22:16:49 +0200117 OP_TX_TO_RX,
Magnus Damm4eb00c92008-08-27 18:33:56 +0900118 OP_RX,
Magnus Dammda672772008-04-22 22:16:49 +0200119 OP_RX_STOP,
Magnus Damm4eb00c92008-08-27 18:33:56 +0900120 OP_RX_STOP_DATA,
Magnus Dammda672772008-04-22 22:16:49 +0200121};
122
123struct sh_mobile_i2c_data {
124 struct device *dev;
125 void __iomem *reg;
126 struct i2c_adapter adap;
Magnus Damm81f81152011-04-28 13:25:36 +0900127 unsigned long bus_speed;
Shinya Kuribayashiebd5ac12012-10-24 19:58:10 +0900128 unsigned int clks_per_count;
Magnus Dammda672772008-04-22 22:16:49 +0200129 struct clk *clk;
Magnus Damm962b6032010-03-11 10:06:02 +0000130 u_int8_t icic;
Magnus Damm962b6032010-03-11 10:06:02 +0000131 u_int8_t flags;
Shinya Kuribayashi23a61292012-10-24 19:57:27 +0900132 u_int16_t iccl;
133 u_int16_t icch;
Magnus Dammda672772008-04-22 22:16:49 +0200134
135 spinlock_t lock;
136 wait_queue_head_t wait;
137 struct i2c_msg *msg;
138 int pos;
139 int sr;
Guennadi Liakhovetskie7890292013-01-17 10:45:57 +0100140 bool send_stop;
Wolfram Sang32e22402015-01-29 18:33:16 +0100141 bool stop_after_dma;
Wolfram Sang2d095812014-11-07 11:11:41 +0100142
Wolfram Sang55f5f982014-12-16 13:31:26 +0100143 struct resource *res;
Wolfram Sang2d095812014-11-07 11:11:41 +0100144 struct dma_chan *dma_tx;
145 struct dma_chan *dma_rx;
146 struct scatterlist sg;
147 enum dma_data_direction dma_direction;
Magnus Dammda672772008-04-22 22:16:49 +0200148};
149
Wolfram Sang67240df2014-05-02 21:15:16 +0200150struct sh_mobile_dt_config {
151 int clks_per_count;
Wolfram Sang3ded3742015-06-09 16:14:39 +0900152 void (*setup)(struct sh_mobile_i2c_data *pd);
Wolfram Sang67240df2014-05-02 21:15:16 +0200153};
154
Magnus Damm962b6032010-03-11 10:06:02 +0000155#define IIC_FLAG_HAS_ICIC67 (1 << 0)
156
Shinya Kuribayashi23a61292012-10-24 19:57:27 +0900157#define STANDARD_MODE 100000
158#define FAST_MODE 400000
Magnus Dammda672772008-04-22 22:16:49 +0200159
160/* Register offsets */
Magnus Damm12a55f22010-03-11 10:05:50 +0000161#define ICDR 0x00
162#define ICCR 0x04
163#define ICSR 0x08
164#define ICIC 0x0c
165#define ICCL 0x10
166#define ICCH 0x14
Wolfram Sang3ded3742015-06-09 16:14:39 +0900167#define ICSTART 0x70
Magnus Dammda672772008-04-22 22:16:49 +0200168
169/* Register bits */
170#define ICCR_ICE 0x80
171#define ICCR_RACK 0x40
172#define ICCR_TRS 0x10
173#define ICCR_BBSY 0x04
174#define ICCR_SCP 0x01
175
176#define ICSR_SCLM 0x80
177#define ICSR_SDAM 0x40
178#define SW_DONE 0x20
179#define ICSR_BUSY 0x10
180#define ICSR_AL 0x08
181#define ICSR_TACK 0x04
182#define ICSR_WAIT 0x02
183#define ICSR_DTE 0x01
184
Magnus Damm962b6032010-03-11 10:06:02 +0000185#define ICIC_ICCLB8 0x80
186#define ICIC_ICCHB8 0x40
Wolfram Sang2d095812014-11-07 11:11:41 +0100187#define ICIC_TDMAE 0x20
188#define ICIC_RDMAE 0x10
Magnus Dammda672772008-04-22 22:16:49 +0200189#define ICIC_ALE 0x08
190#define ICIC_TACKE 0x04
191#define ICIC_WAITE 0x02
192#define ICIC_DTEE 0x01
193
Wolfram Sang3ded3742015-06-09 16:14:39 +0900194#define ICSTART_ICSTART 0x10
195
Magnus Damm12a55f22010-03-11 10:05:50 +0000196static void iic_wr(struct sh_mobile_i2c_data *pd, int offs, unsigned char data)
197{
Magnus Damm962b6032010-03-11 10:06:02 +0000198 if (offs == ICIC)
199 data |= pd->icic;
200
Magnus Damm12a55f22010-03-11 10:05:50 +0000201 iowrite8(data, pd->reg + offs);
202}
203
204static unsigned char iic_rd(struct sh_mobile_i2c_data *pd, int offs)
205{
206 return ioread8(pd->reg + offs);
207}
208
209static void iic_set_clr(struct sh_mobile_i2c_data *pd, int offs,
210 unsigned char set, unsigned char clr)
211{
212 iic_wr(pd, offs, (iic_rd(pd, offs) | set) & ~clr);
213}
214
Wolfram Sanged4121e2014-05-02 21:15:13 +0200215static u32 sh_mobile_i2c_iccl(unsigned long count_khz, u32 tLOW, u32 tf)
Shinya Kuribayashi23a61292012-10-24 19:57:27 +0900216{
217 /*
218 * Conditional expression:
219 * ICCL >= COUNT_CLK * (tLOW + tf)
220 *
221 * SH-Mobile IIC hardware starts counting the LOW period of
222 * the SCL signal (tLOW) as soon as it pulls the SCL line.
223 * In order to meet the tLOW timing spec, we need to take into
224 * account the fall time of SCL signal (tf). Default tf value
225 * should be 0.3 us, for safety.
226 */
Wolfram Sanged4121e2014-05-02 21:15:13 +0200227 return (((count_khz * (tLOW + tf)) + 5000) / 10000);
Shinya Kuribayashi23a61292012-10-24 19:57:27 +0900228}
229
Wolfram Sanged4121e2014-05-02 21:15:13 +0200230static u32 sh_mobile_i2c_icch(unsigned long count_khz, u32 tHIGH, u32 tf)
Shinya Kuribayashi23a61292012-10-24 19:57:27 +0900231{
232 /*
233 * Conditional expression:
234 * ICCH >= COUNT_CLK * (tHIGH + tf)
235 *
236 * SH-Mobile IIC hardware is aware of SCL transition period 'tr',
237 * and can ignore it. SH-Mobile IIC controller starts counting
238 * the HIGH period of the SCL signal (tHIGH) after the SCL input
239 * voltage increases at VIH.
240 *
241 * Afterward it turned out calculating ICCH using only tHIGH spec
242 * will result in violation of the tHD;STA timing spec. We need
243 * to take into account the fall time of SDA signal (tf) at START
244 * condition, in order to meet both tHIGH and tHD;STA specs.
245 */
Wolfram Sanged4121e2014-05-02 21:15:13 +0200246 return (((count_khz * (tHIGH + tf)) + 5000) / 10000);
Shinya Kuribayashi23a61292012-10-24 19:57:27 +0900247}
248
Wolfram Sang6ed70532014-05-02 21:15:14 +0200249static int sh_mobile_i2c_init(struct sh_mobile_i2c_data *pd)
Magnus Dammda672772008-04-22 22:16:49 +0200250{
Shinya Kuribayashi23a61292012-10-24 19:57:27 +0900251 unsigned long i2c_clk_khz;
252 u32 tHIGH, tLOW, tf;
Wolfram Sang7663ebe2014-05-02 21:15:15 +0200253 uint16_t max_val;
Magnus Damma5616bd2008-10-31 20:20:55 +0900254
Magnus Damma5616bd2008-10-31 20:20:55 +0900255 /* Get clock rate after clock is enabled */
Laurent Pinchartf8876052013-10-28 23:49:23 +0100256 clk_prepare_enable(pd->clk);
Shinya Kuribayashi23a61292012-10-24 19:57:27 +0900257 i2c_clk_khz = clk_get_rate(pd->clk) / 1000;
Wolfram Sang6ed70532014-05-02 21:15:14 +0200258 clk_disable_unprepare(pd->clk);
Shinya Kuribayashiebd5ac12012-10-24 19:58:10 +0900259 i2c_clk_khz /= pd->clks_per_count;
Magnus Damma5616bd2008-10-31 20:20:55 +0900260
Shinya Kuribayashi23a61292012-10-24 19:57:27 +0900261 if (pd->bus_speed == STANDARD_MODE) {
262 tLOW = 47; /* tLOW = 4.7 us */
263 tHIGH = 40; /* tHD;STA = tHIGH = 4.0 us */
264 tf = 3; /* tf = 0.3 us */
Shinya Kuribayashi23a61292012-10-24 19:57:27 +0900265 } else if (pd->bus_speed == FAST_MODE) {
266 tLOW = 13; /* tLOW = 1.3 us */
267 tHIGH = 6; /* tHD;STA = tHIGH = 0.6 us */
268 tf = 3; /* tf = 0.3 us */
Shinya Kuribayashi23a61292012-10-24 19:57:27 +0900269 } else {
270 dev_err(pd->dev, "unrecognized bus speed %lu Hz\n",
271 pd->bus_speed);
Wolfram Sang6ed70532014-05-02 21:15:14 +0200272 return -EINVAL;
Shinya Kuribayashi23a61292012-10-24 19:57:27 +0900273 }
Magnus Damma5616bd2008-10-31 20:20:55 +0900274
Wolfram Sanged4121e2014-05-02 21:15:13 +0200275 pd->iccl = sh_mobile_i2c_iccl(i2c_clk_khz, tLOW, tf);
Wolfram Sang7663ebe2014-05-02 21:15:15 +0200276 pd->icch = sh_mobile_i2c_icch(i2c_clk_khz, tHIGH, tf);
277
278 max_val = pd->flags & IIC_FLAG_HAS_ICIC67 ? 0x1ff : 0xff;
279 if (pd->iccl > max_val || pd->icch > max_val) {
280 dev_err(pd->dev, "timing values out of range: L/H=0x%x/0x%x\n",
281 pd->iccl, pd->icch);
282 return -EINVAL;
283 }
284
Magnus Damm962b6032010-03-11 10:06:02 +0000285 /* one more bit of ICCL in ICIC */
Wolfram Sang7663ebe2014-05-02 21:15:15 +0200286 if (pd->iccl & 0x100)
Shinya Kuribayashi23a61292012-10-24 19:57:27 +0900287 pd->icic |= ICIC_ICCLB8;
Magnus Damma5616bd2008-10-31 20:20:55 +0900288 else
Shinya Kuribayashi23a61292012-10-24 19:57:27 +0900289 pd->icic &= ~ICIC_ICCLB8;
Magnus Damma5616bd2008-10-31 20:20:55 +0900290
Magnus Damm962b6032010-03-11 10:06:02 +0000291 /* one more bit of ICCH in ICIC */
Wolfram Sang7663ebe2014-05-02 21:15:15 +0200292 if (pd->icch & 0x100)
Shinya Kuribayashi23a61292012-10-24 19:57:27 +0900293 pd->icic |= ICIC_ICCHB8;
294 else
295 pd->icic &= ~ICIC_ICCHB8;
Magnus Damm962b6032010-03-11 10:06:02 +0000296
Wolfram Sang7ca01862014-11-07 11:11:42 +0100297 dev_dbg(pd->dev, "timing values: L/H=0x%x/0x%x\n", pd->iccl, pd->icch);
Wolfram Sang6ed70532014-05-02 21:15:14 +0200298 return 0;
Shinya Kuribayashi7b0e6292012-10-24 19:56:51 +0900299}
300
301static void activate_ch(struct sh_mobile_i2c_data *pd)
302{
303 /* Wake up device and enable clock */
304 pm_runtime_get_sync(pd->dev);
Laurent Pinchartf8876052013-10-28 23:49:23 +0100305 clk_prepare_enable(pd->clk);
Shinya Kuribayashi7b0e6292012-10-24 19:56:51 +0900306
Magnus Dammda672772008-04-22 22:16:49 +0200307 /* Enable channel and configure rx ack */
Magnus Damm12a55f22010-03-11 10:05:50 +0000308 iic_set_clr(pd, ICCR, ICCR_ICE, 0);
Magnus Dammda672772008-04-22 22:16:49 +0200309
310 /* Mask all interrupts */
Magnus Damm12a55f22010-03-11 10:05:50 +0000311 iic_wr(pd, ICIC, 0);
Magnus Dammda672772008-04-22 22:16:49 +0200312
313 /* Set the clock */
Shinya Kuribayashi23a61292012-10-24 19:57:27 +0900314 iic_wr(pd, ICCL, pd->iccl & 0xff);
315 iic_wr(pd, ICCH, pd->icch & 0xff);
Magnus Dammda672772008-04-22 22:16:49 +0200316}
317
318static void deactivate_ch(struct sh_mobile_i2c_data *pd)
319{
320 /* Clear/disable interrupts */
Magnus Damm12a55f22010-03-11 10:05:50 +0000321 iic_wr(pd, ICSR, 0);
322 iic_wr(pd, ICIC, 0);
Magnus Dammda672772008-04-22 22:16:49 +0200323
324 /* Disable channel */
Magnus Damm12a55f22010-03-11 10:05:50 +0000325 iic_set_clr(pd, ICCR, 0, ICCR_ICE);
Magnus Dammda672772008-04-22 22:16:49 +0200326
Magnus Dammf1a3b992009-08-14 10:48:59 +0000327 /* Disable clock and mark device as idle */
Laurent Pinchartf8876052013-10-28 23:49:23 +0100328 clk_disable_unprepare(pd->clk);
Magnus Dammf1a3b992009-08-14 10:48:59 +0000329 pm_runtime_put_sync(pd->dev);
Magnus Dammda672772008-04-22 22:16:49 +0200330}
331
332static unsigned char i2c_op(struct sh_mobile_i2c_data *pd,
333 enum sh_mobile_i2c_op op, unsigned char data)
334{
335 unsigned char ret = 0;
336 unsigned long flags;
337
338 dev_dbg(pd->dev, "op %d, data in 0x%02x\n", op, data);
339
340 spin_lock_irqsave(&pd->lock, flags);
341
342 switch (op) {
Magnus Damm4eb00c92008-08-27 18:33:56 +0900343 case OP_START: /* issue start and trigger DTE interrupt */
Wolfram Sanga78f6a42014-05-02 21:15:07 +0200344 iic_wr(pd, ICCR, ICCR_ICE | ICCR_TRS | ICCR_BBSY);
Magnus Dammda672772008-04-22 22:16:49 +0200345 break;
Magnus Damm4eb00c92008-08-27 18:33:56 +0900346 case OP_TX_FIRST: /* disable DTE interrupt and write data */
Magnus Damm12a55f22010-03-11 10:05:50 +0000347 iic_wr(pd, ICIC, ICIC_WAITE | ICIC_ALE | ICIC_TACKE);
348 iic_wr(pd, ICDR, data);
Magnus Dammda672772008-04-22 22:16:49 +0200349 break;
Magnus Damm4eb00c92008-08-27 18:33:56 +0900350 case OP_TX: /* write data */
Magnus Damm12a55f22010-03-11 10:05:50 +0000351 iic_wr(pd, ICDR, data);
Magnus Damm4eb00c92008-08-27 18:33:56 +0900352 break;
Wolfram Sang2d095812014-11-07 11:11:41 +0100353 case OP_TX_STOP_DATA: /* write data and issue a stop afterwards */
Magnus Damm12a55f22010-03-11 10:05:50 +0000354 iic_wr(pd, ICDR, data);
Wolfram Sang2d095812014-11-07 11:11:41 +0100355 /* fallthrough */
356 case OP_TX_STOP: /* issue a stop */
Wolfram Sanga78f6a42014-05-02 21:15:07 +0200357 iic_wr(pd, ICCR, pd->send_stop ? ICCR_ICE | ICCR_TRS
358 : ICCR_ICE | ICCR_TRS | ICCR_BBSY);
Magnus Dammda672772008-04-22 22:16:49 +0200359 break;
Magnus Damm4eb00c92008-08-27 18:33:56 +0900360 case OP_TX_TO_RX: /* select read mode */
Wolfram Sanga78f6a42014-05-02 21:15:07 +0200361 iic_wr(pd, ICCR, ICCR_ICE | ICCR_SCP);
Magnus Dammda672772008-04-22 22:16:49 +0200362 break;
Magnus Damm4eb00c92008-08-27 18:33:56 +0900363 case OP_RX: /* just read data */
Magnus Damm12a55f22010-03-11 10:05:50 +0000364 ret = iic_rd(pd, ICDR);
Magnus Dammda672772008-04-22 22:16:49 +0200365 break;
Magnus Damm4eb00c92008-08-27 18:33:56 +0900366 case OP_RX_STOP: /* enable DTE interrupt, issue stop */
Magnus Damm12a55f22010-03-11 10:05:50 +0000367 iic_wr(pd, ICIC,
368 ICIC_DTEE | ICIC_WAITE | ICIC_ALE | ICIC_TACKE);
Wolfram Sanga78f6a42014-05-02 21:15:07 +0200369 iic_wr(pd, ICCR, ICCR_ICE | ICCR_RACK);
Magnus Damm4eb00c92008-08-27 18:33:56 +0900370 break;
371 case OP_RX_STOP_DATA: /* enable DTE interrupt, read data, issue stop */
Magnus Damm12a55f22010-03-11 10:05:50 +0000372 iic_wr(pd, ICIC,
373 ICIC_DTEE | ICIC_WAITE | ICIC_ALE | ICIC_TACKE);
374 ret = iic_rd(pd, ICDR);
Wolfram Sanga78f6a42014-05-02 21:15:07 +0200375 iic_wr(pd, ICCR, ICCR_ICE | ICCR_RACK);
Magnus Dammda672772008-04-22 22:16:49 +0200376 break;
377 }
378
379 spin_unlock_irqrestore(&pd->lock, flags);
380
381 dev_dbg(pd->dev, "op %d, data out 0x%02x\n", op, ret);
382 return ret;
383}
384
Guennadi Liakhovetski05cf9362013-01-17 10:45:54 +0100385static bool sh_mobile_i2c_is_first_byte(struct sh_mobile_i2c_data *pd)
Magnus Damm4eb00c92008-08-27 18:33:56 +0900386{
Guennadi Liakhovetski05cf9362013-01-17 10:45:54 +0100387 return pd->pos == -1;
Magnus Damm4eb00c92008-08-27 18:33:56 +0900388}
389
Guennadi Liakhovetski05cf9362013-01-17 10:45:54 +0100390static bool sh_mobile_i2c_is_last_byte(struct sh_mobile_i2c_data *pd)
Magnus Damm4eb00c92008-08-27 18:33:56 +0900391{
Guennadi Liakhovetski05cf9362013-01-17 10:45:54 +0100392 return pd->pos == pd->msg->len - 1;
Magnus Damm4eb00c92008-08-27 18:33:56 +0900393}
394
395static void sh_mobile_i2c_get_data(struct sh_mobile_i2c_data *pd,
396 unsigned char *buf)
397{
398 switch (pd->pos) {
399 case -1:
Wolfram Sang3f8a57b2016-04-03 20:44:59 +0200400 *buf = i2c_8bit_addr_from_msg(pd->msg);
Magnus Damm4eb00c92008-08-27 18:33:56 +0900401 break;
402 default:
403 *buf = pd->msg->buf[pd->pos];
404 }
405}
406
407static int sh_mobile_i2c_isr_tx(struct sh_mobile_i2c_data *pd)
408{
409 unsigned char data;
410
Wolfram Sang2d095812014-11-07 11:11:41 +0100411 if (pd->pos == pd->msg->len) {
412 /* Send stop if we haven't yet (DMA case) */
Wolfram Sang32e22402015-01-29 18:33:16 +0100413 if (pd->send_stop && pd->stop_after_dma)
Wolfram Sang2d095812014-11-07 11:11:41 +0100414 i2c_op(pd, OP_TX_STOP, 0);
Magnus Damm4eb00c92008-08-27 18:33:56 +0900415 return 1;
Wolfram Sang2d095812014-11-07 11:11:41 +0100416 }
Magnus Damm4eb00c92008-08-27 18:33:56 +0900417
418 sh_mobile_i2c_get_data(pd, &data);
419
420 if (sh_mobile_i2c_is_last_byte(pd))
Wolfram Sang2d095812014-11-07 11:11:41 +0100421 i2c_op(pd, OP_TX_STOP_DATA, data);
Magnus Damm4eb00c92008-08-27 18:33:56 +0900422 else if (sh_mobile_i2c_is_first_byte(pd))
423 i2c_op(pd, OP_TX_FIRST, data);
424 else
425 i2c_op(pd, OP_TX, data);
426
427 pd->pos++;
428 return 0;
429}
430
431static int sh_mobile_i2c_isr_rx(struct sh_mobile_i2c_data *pd)
432{
433 unsigned char data;
434 int real_pos;
435
436 do {
437 if (pd->pos <= -1) {
438 sh_mobile_i2c_get_data(pd, &data);
439
440 if (sh_mobile_i2c_is_first_byte(pd))
441 i2c_op(pd, OP_TX_FIRST, data);
442 else
443 i2c_op(pd, OP_TX, data);
444 break;
445 }
446
447 if (pd->pos == 0) {
448 i2c_op(pd, OP_TX_TO_RX, 0);
449 break;
450 }
451
452 real_pos = pd->pos - 2;
453
454 if (pd->pos == pd->msg->len) {
Wolfram Sang32e22402015-01-29 18:33:16 +0100455 if (pd->stop_after_dma) {
456 /* Simulate PIO end condition after DMA transfer */
457 i2c_op(pd, OP_RX_STOP, 0);
458 pd->pos++;
459 break;
460 }
461
Magnus Damm4eb00c92008-08-27 18:33:56 +0900462 if (real_pos < 0) {
463 i2c_op(pd, OP_RX_STOP, 0);
464 break;
465 }
466 data = i2c_op(pd, OP_RX_STOP_DATA, 0);
467 } else
468 data = i2c_op(pd, OP_RX, 0);
469
Magnus Dammbff4056c82008-11-13 15:28:21 +0900470 if (real_pos >= 0)
471 pd->msg->buf[real_pos] = data;
Magnus Damm4eb00c92008-08-27 18:33:56 +0900472 } while (0);
473
474 pd->pos++;
475 return pd->pos == (pd->msg->len + 2);
476}
477
Magnus Dammda672772008-04-22 22:16:49 +0200478static irqreturn_t sh_mobile_i2c_isr(int irq, void *dev_id)
479{
Wolfram Sang530834b2014-12-04 17:20:49 +0100480 struct sh_mobile_i2c_data *pd = dev_id;
Magnus Damm4eb00c92008-08-27 18:33:56 +0900481 unsigned char sr;
Wolfram Sang2d095812014-11-07 11:11:41 +0100482 int wakeup = 0;
Magnus Dammda672772008-04-22 22:16:49 +0200483
Magnus Damm12a55f22010-03-11 10:05:50 +0000484 sr = iic_rd(pd, ICSR);
Magnus Damm4eb00c92008-08-27 18:33:56 +0900485 pd->sr |= sr; /* remember state */
Magnus Dammda672772008-04-22 22:16:49 +0200486
487 dev_dbg(pd->dev, "i2c_isr 0x%02x 0x%02x %s %d %d!\n", sr, pd->sr,
Magnus Damm4eb00c92008-08-27 18:33:56 +0900488 (pd->msg->flags & I2C_M_RD) ? "read" : "write",
489 pd->pos, pd->msg->len);
Magnus Dammda672772008-04-22 22:16:49 +0200490
Wolfram Sang2d095812014-11-07 11:11:41 +0100491 /* Kick off TxDMA after preface was done */
492 if (pd->dma_direction == DMA_TO_DEVICE && pd->pos == 0)
493 iic_set_clr(pd, ICIC, ICIC_TDMAE, 0);
494 else if (sr & (ICSR_AL | ICSR_TACK))
Magnus Damm4eb00c92008-08-27 18:33:56 +0900495 /* don't interrupt transaction - continue to issue stop */
Magnus Damm12a55f22010-03-11 10:05:50 +0000496 iic_wr(pd, ICSR, sr & ~(ICSR_AL | ICSR_TACK));
Wolfram Sang2d095812014-11-07 11:11:41 +0100497 else if (pd->msg->flags & I2C_M_RD)
Magnus Damm4eb00c92008-08-27 18:33:56 +0900498 wakeup = sh_mobile_i2c_isr_rx(pd);
499 else
500 wakeup = sh_mobile_i2c_isr_tx(pd);
Magnus Dammda672772008-04-22 22:16:49 +0200501
Wolfram Sang2d095812014-11-07 11:11:41 +0100502 /* Kick off RxDMA after preface was done */
503 if (pd->dma_direction == DMA_FROM_DEVICE && pd->pos == 1)
504 iic_set_clr(pd, ICIC, ICIC_RDMAE, 0);
505
Magnus Damm4eb00c92008-08-27 18:33:56 +0900506 if (sr & ICSR_WAIT) /* TODO: add delay here to support slow acks */
Magnus Damm12a55f22010-03-11 10:05:50 +0000507 iic_wr(pd, ICSR, sr & ~ICSR_WAIT);
Magnus Dammda672772008-04-22 22:16:49 +0200508
Magnus Dammda672772008-04-22 22:16:49 +0200509 if (wakeup) {
510 pd->sr |= SW_DONE;
511 wake_up(&pd->wait);
512 }
513
Shinya Kuribayashi29fb08c2012-10-24 19:58:31 +0900514 /* defeat write posting to avoid spurious WAIT interrupts */
515 iic_rd(pd, ICSR);
516
Magnus Dammda672772008-04-22 22:16:49 +0200517 return IRQ_HANDLED;
518}
519
Wolfram Sang8cfcae92014-11-19 13:43:22 +0100520static void sh_mobile_i2c_dma_unmap(struct sh_mobile_i2c_data *pd)
521{
522 struct dma_chan *chan = pd->dma_direction == DMA_FROM_DEVICE
523 ? pd->dma_rx : pd->dma_tx;
524
525 dma_unmap_single(chan->device->dev, sg_dma_address(&pd->sg),
526 pd->msg->len, pd->dma_direction);
527
528 pd->dma_direction = DMA_NONE;
529}
530
Wolfram Sang2d095812014-11-07 11:11:41 +0100531static void sh_mobile_i2c_cleanup_dma(struct sh_mobile_i2c_data *pd)
532{
533 if (pd->dma_direction == DMA_NONE)
534 return;
535 else if (pd->dma_direction == DMA_FROM_DEVICE)
536 dmaengine_terminate_all(pd->dma_rx);
537 else if (pd->dma_direction == DMA_TO_DEVICE)
538 dmaengine_terminate_all(pd->dma_tx);
539
Wolfram Sang8cfcae92014-11-19 13:43:22 +0100540 sh_mobile_i2c_dma_unmap(pd);
Wolfram Sang2d095812014-11-07 11:11:41 +0100541}
542
543static void sh_mobile_i2c_dma_callback(void *data)
544{
545 struct sh_mobile_i2c_data *pd = data;
546
Wolfram Sang8cfcae92014-11-19 13:43:22 +0100547 sh_mobile_i2c_dma_unmap(pd);
Wolfram Sang2d095812014-11-07 11:11:41 +0100548 pd->pos = pd->msg->len;
Wolfram Sang32e22402015-01-29 18:33:16 +0100549 pd->stop_after_dma = true;
Wolfram Sang2d095812014-11-07 11:11:41 +0100550
551 iic_set_clr(pd, ICIC, 0, ICIC_TDMAE | ICIC_RDMAE);
552}
553
Wolfram Sang55f5f982014-12-16 13:31:26 +0100554static struct dma_chan *sh_mobile_i2c_request_dma_chan(struct device *dev,
555 enum dma_transfer_direction dir, dma_addr_t port_addr)
556{
557 struct dma_chan *chan;
558 struct dma_slave_config cfg;
559 char *chan_name = dir == DMA_MEM_TO_DEV ? "tx" : "rx";
560 int ret;
561
562 chan = dma_request_slave_channel_reason(dev, chan_name);
563 if (IS_ERR(chan)) {
Eugeniu Rosca75fdc512017-08-15 22:36:24 +0200564 dev_dbg(dev, "request_channel failed for %s (%ld)\n", chan_name,
565 PTR_ERR(chan));
Wolfram Sang55f5f982014-12-16 13:31:26 +0100566 return chan;
567 }
568
569 memset(&cfg, 0, sizeof(cfg));
570 cfg.direction = dir;
571 if (dir == DMA_MEM_TO_DEV) {
572 cfg.dst_addr = port_addr;
573 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
574 } else {
575 cfg.src_addr = port_addr;
576 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
577 }
578
579 ret = dmaengine_slave_config(chan, &cfg);
580 if (ret) {
581 dev_dbg(dev, "slave_config failed for %s (%d)\n", chan_name, ret);
582 dma_release_channel(chan);
583 return ERR_PTR(ret);
584 }
585
586 dev_dbg(dev, "got DMA channel for %s\n", chan_name);
587 return chan;
588}
589
Wolfram Sang2d095812014-11-07 11:11:41 +0100590static void sh_mobile_i2c_xfer_dma(struct sh_mobile_i2c_data *pd)
591{
592 bool read = pd->msg->flags & I2C_M_RD;
593 enum dma_data_direction dir = read ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
594 struct dma_chan *chan = read ? pd->dma_rx : pd->dma_tx;
595 struct dma_async_tx_descriptor *txdesc;
596 dma_addr_t dma_addr;
597 dma_cookie_t cookie;
598
Wolfram Sang55f5f982014-12-16 13:31:26 +0100599 if (PTR_ERR(chan) == -EPROBE_DEFER) {
600 if (read)
601 chan = pd->dma_rx = sh_mobile_i2c_request_dma_chan(pd->dev, DMA_DEV_TO_MEM,
602 pd->res->start + ICDR);
603 else
604 chan = pd->dma_tx = sh_mobile_i2c_request_dma_chan(pd->dev, DMA_MEM_TO_DEV,
605 pd->res->start + ICDR);
606 }
607
Wolfram Sange844a792014-12-16 13:31:25 +0100608 if (IS_ERR(chan))
Wolfram Sang2d095812014-11-07 11:11:41 +0100609 return;
610
Wolfram Sang8cfcae92014-11-19 13:43:22 +0100611 dma_addr = dma_map_single(chan->device->dev, pd->msg->buf, pd->msg->len, dir);
Wolfram Sang488d69e2016-08-24 11:19:28 +0200612 if (dma_mapping_error(chan->device->dev, dma_addr)) {
Wolfram Sang2d095812014-11-07 11:11:41 +0100613 dev_dbg(pd->dev, "dma map failed, using PIO\n");
614 return;
615 }
616
617 sg_dma_len(&pd->sg) = pd->msg->len;
618 sg_dma_address(&pd->sg) = dma_addr;
619
620 pd->dma_direction = dir;
621
622 txdesc = dmaengine_prep_slave_sg(chan, &pd->sg, 1,
623 read ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV,
624 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
625 if (!txdesc) {
626 dev_dbg(pd->dev, "dma prep slave sg failed, using PIO\n");
627 sh_mobile_i2c_cleanup_dma(pd);
628 return;
629 }
630
631 txdesc->callback = sh_mobile_i2c_dma_callback;
632 txdesc->callback_param = pd;
633
634 cookie = dmaengine_submit(txdesc);
635 if (dma_submit_error(cookie)) {
636 dev_dbg(pd->dev, "submitting dma failed, using PIO\n");
637 sh_mobile_i2c_cleanup_dma(pd);
638 return;
639 }
640
641 dma_async_issue_pending(chan);
642}
643
Guennadi Liakhovetskie7890292013-01-17 10:45:57 +0100644static int start_ch(struct sh_mobile_i2c_data *pd, struct i2c_msg *usr_msg,
645 bool do_init)
Magnus Dammda672772008-04-22 22:16:49 +0200646{
Magnus Damm4eb00c92008-08-27 18:33:56 +0900647 if (usr_msg->len == 0 && (usr_msg->flags & I2C_M_RD)) {
648 dev_err(pd->dev, "Unsupported zero length i2c read\n");
Wolfram Sang5a72b252014-05-02 21:15:08 +0200649 return -EOPNOTSUPP;
Magnus Damm4eb00c92008-08-27 18:33:56 +0900650 }
651
Guennadi Liakhovetskie7890292013-01-17 10:45:57 +0100652 if (do_init) {
653 /* Initialize channel registers */
654 iic_set_clr(pd, ICCR, 0, ICCR_ICE);
Magnus Dammda672772008-04-22 22:16:49 +0200655
Guennadi Liakhovetskie7890292013-01-17 10:45:57 +0100656 /* Enable channel and configure rx ack */
657 iic_set_clr(pd, ICCR, ICCR_ICE, 0);
Magnus Dammda672772008-04-22 22:16:49 +0200658
Guennadi Liakhovetskie7890292013-01-17 10:45:57 +0100659 /* Set the clock */
660 iic_wr(pd, ICCL, pd->iccl & 0xff);
661 iic_wr(pd, ICCH, pd->icch & 0xff);
662 }
Magnus Dammda672772008-04-22 22:16:49 +0200663
664 pd->msg = usr_msg;
665 pd->pos = -1;
666 pd->sr = 0;
667
Wolfram Sang2d095812014-11-07 11:11:41 +0100668 if (pd->msg->len > 8)
669 sh_mobile_i2c_xfer_dma(pd);
670
Magnus Damm4eb00c92008-08-27 18:33:56 +0900671 /* Enable all interrupts to begin with */
Magnus Damm12a55f22010-03-11 10:05:50 +0000672 iic_wr(pd, ICIC, ICIC_DTEE | ICIC_WAITE | ICIC_ALE | ICIC_TACKE);
Magnus Dammda672772008-04-22 22:16:49 +0200673 return 0;
674}
675
Guennadi Liakhovetskie7890292013-01-17 10:45:57 +0100676static int poll_dte(struct sh_mobile_i2c_data *pd)
677{
678 int i;
679
680 for (i = 1000; i; i--) {
681 u_int8_t val = iic_rd(pd, ICSR);
682
683 if (val & ICSR_DTE)
684 break;
685
686 if (val & ICSR_TACK)
Wolfram Sang5a72b252014-05-02 21:15:08 +0200687 return -ENXIO;
Guennadi Liakhovetskie7890292013-01-17 10:45:57 +0100688
689 udelay(10);
690 }
691
Wolfram Sang5a72b252014-05-02 21:15:08 +0200692 return i ? 0 : -ETIMEDOUT;
Guennadi Liakhovetskie7890292013-01-17 10:45:57 +0100693}
694
Guennadi Liakhovetski4b382312013-01-17 10:45:56 +0100695static int poll_busy(struct sh_mobile_i2c_data *pd)
696{
697 int i;
698
699 for (i = 1000; i; i--) {
700 u_int8_t val = iic_rd(pd, ICSR);
701
702 dev_dbg(pd->dev, "val 0x%02x pd->sr 0x%02x\n", val, pd->sr);
703
704 /* the interrupt handler may wake us up before the
705 * transfer is finished, so poll the hardware
706 * until we're done.
707 */
708 if (!(val & ICSR_BUSY)) {
709 /* handle missing acknowledge and arbitration lost */
Wolfram Sang5a72b252014-05-02 21:15:08 +0200710 val |= pd->sr;
711 if (val & ICSR_TACK)
712 return -ENXIO;
713 if (val & ICSR_AL)
714 return -EAGAIN;
Guennadi Liakhovetski4b382312013-01-17 10:45:56 +0100715 break;
716 }
717
718 udelay(10);
719 }
720
Wolfram Sang5a72b252014-05-02 21:15:08 +0200721 return i ? 0 : -ETIMEDOUT;
Guennadi Liakhovetski4b382312013-01-17 10:45:56 +0100722}
723
Magnus Dammda672772008-04-22 22:16:49 +0200724static int sh_mobile_i2c_xfer(struct i2c_adapter *adapter,
725 struct i2c_msg *msgs,
726 int num)
727{
728 struct sh_mobile_i2c_data *pd = i2c_get_adapdata(adapter);
729 struct i2c_msg *msg;
730 int err = 0;
Wolfram Sang365322f2015-06-20 21:03:22 +0200731 int i;
732 long timeout;
Magnus Dammda672772008-04-22 22:16:49 +0200733
734 activate_ch(pd);
735
736 /* Process all messages */
737 for (i = 0; i < num; i++) {
Guennadi Liakhovetskie7890292013-01-17 10:45:57 +0100738 bool do_start = pd->send_stop || !i;
Magnus Dammda672772008-04-22 22:16:49 +0200739 msg = &msgs[i];
Guennadi Liakhovetskie7890292013-01-17 10:45:57 +0100740 pd->send_stop = i == num - 1 || msg->flags & I2C_M_STOP;
Wolfram Sang32e22402015-01-29 18:33:16 +0100741 pd->stop_after_dma = false;
Magnus Dammda672772008-04-22 22:16:49 +0200742
Guennadi Liakhovetskie7890292013-01-17 10:45:57 +0100743 err = start_ch(pd, msg, do_start);
Magnus Dammda672772008-04-22 22:16:49 +0200744 if (err)
745 break;
746
Guennadi Liakhovetskie7890292013-01-17 10:45:57 +0100747 if (do_start)
748 i2c_op(pd, OP_START, 0);
Magnus Dammda672772008-04-22 22:16:49 +0200749
750 /* The interrupt handler takes care of the rest... */
Wolfram Sang365322f2015-06-20 21:03:22 +0200751 timeout = wait_event_timeout(pd->wait,
Magnus Dammda672772008-04-22 22:16:49 +0200752 pd->sr & (ICSR_TACK | SW_DONE),
Wolfram Sang41bdbd22015-06-20 21:03:21 +0200753 adapter->timeout);
Wolfram Sang365322f2015-06-20 21:03:22 +0200754 if (!timeout) {
Magnus Dammda672772008-04-22 22:16:49 +0200755 dev_err(pd->dev, "Transfer request timed out\n");
Wolfram Sang2d095812014-11-07 11:11:41 +0100756 if (pd->dma_direction != DMA_NONE)
757 sh_mobile_i2c_cleanup_dma(pd);
758
Guennadi Liakhovetski56872652013-01-17 10:45:55 +0100759 err = -ETIMEDOUT;
760 break;
761 }
Magnus Dammda672772008-04-22 22:16:49 +0200762
Guennadi Liakhovetskie7890292013-01-17 10:45:57 +0100763 if (pd->send_stop)
764 err = poll_busy(pd);
765 else
766 err = poll_dte(pd);
Guennadi Liakhovetski4b382312013-01-17 10:45:56 +0100767 if (err < 0)
Magnus Dammda672772008-04-22 22:16:49 +0200768 break;
Magnus Dammda672772008-04-22 22:16:49 +0200769 }
770
771 deactivate_ch(pd);
772
773 if (!err)
774 err = num;
775 return err;
776}
777
778static u32 sh_mobile_i2c_func(struct i2c_adapter *adapter)
779{
Guennadi Liakhovetskie7890292013-01-17 10:45:57 +0100780 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_PROTOCOL_MANGLING;
Magnus Dammda672772008-04-22 22:16:49 +0200781}
782
Bhumika Goyal92d9d0d2017-01-27 23:36:17 +0530783static const struct i2c_algorithm sh_mobile_i2c_algorithm = {
Magnus Dammda672772008-04-22 22:16:49 +0200784 .functionality = sh_mobile_i2c_func,
785 .master_xfer = sh_mobile_i2c_xfer,
786};
787
Wolfram Sang3ded3742015-06-09 16:14:39 +0900788/*
789 * r8a7740 chip has lasting errata on I2C I/O pad reset.
790 * this is work-around for it.
791 */
792static void sh_mobile_i2c_r8a7740_workaround(struct sh_mobile_i2c_data *pd)
793{
794 iic_set_clr(pd, ICCR, ICCR_ICE, 0);
795 iic_rd(pd, ICCR); /* dummy read */
796
797 iic_set_clr(pd, ICSTART, ICSTART_ICSTART, 0);
798 iic_rd(pd, ICSTART); /* dummy read */
799
800 udelay(10);
801
802 iic_wr(pd, ICCR, ICCR_SCP);
803 iic_wr(pd, ICSTART, 0);
804
805 udelay(10);
806
807 iic_wr(pd, ICCR, ICCR_TRS);
808 udelay(10);
809 iic_wr(pd, ICCR, 0);
810 udelay(10);
811 iic_wr(pd, ICCR, ICCR_TRS);
812 udelay(10);
813}
814
Wolfram Sang67240df2014-05-02 21:15:16 +0200815static const struct sh_mobile_dt_config default_dt_config = {
816 .clks_per_count = 1,
817};
818
Geert Uytterhoeven78df4452014-11-06 12:52:07 +0100819static const struct sh_mobile_dt_config fast_clock_dt_config = {
Wolfram Sang67240df2014-05-02 21:15:16 +0200820 .clks_per_count = 2,
821};
822
Wolfram Sang3ded3742015-06-09 16:14:39 +0900823static const struct sh_mobile_dt_config r8a7740_dt_config = {
824 .clks_per_count = 1,
825 .setup = sh_mobile_i2c_r8a7740_workaround,
826};
827
Wolfram Sang67240df2014-05-02 21:15:16 +0200828static const struct of_device_id sh_mobile_i2c_dt_ids[] = {
Geert Uytterhoeven78df4452014-11-06 12:52:07 +0100829 { .compatible = "renesas,iic-r8a73a4", .data = &fast_clock_dt_config },
Wolfram Sang3ded3742015-06-09 16:14:39 +0900830 { .compatible = "renesas,iic-r8a7740", .data = &r8a7740_dt_config },
Geert Uytterhoeven78df4452014-11-06 12:52:07 +0100831 { .compatible = "renesas,iic-r8a7790", .data = &fast_clock_dt_config },
832 { .compatible = "renesas,iic-r8a7791", .data = &fast_clock_dt_config },
833 { .compatible = "renesas,iic-r8a7792", .data = &fast_clock_dt_config },
834 { .compatible = "renesas,iic-r8a7793", .data = &fast_clock_dt_config },
835 { .compatible = "renesas,iic-r8a7794", .data = &fast_clock_dt_config },
Simon Hormanb880cca2016-12-07 11:39:36 +0100836 { .compatible = "renesas,rcar-gen2-iic", .data = &fast_clock_dt_config },
Wolfram Sang7bb6da52015-08-05 15:18:26 +0200837 { .compatible = "renesas,iic-r8a7795", .data = &fast_clock_dt_config },
Simon Hormanb880cca2016-12-07 11:39:36 +0100838 { .compatible = "renesas,rcar-gen3-iic", .data = &fast_clock_dt_config },
Geert Uytterhoeven78df4452014-11-06 12:52:07 +0100839 { .compatible = "renesas,iic-sh73a0", .data = &fast_clock_dt_config },
Simon Hormanb880cca2016-12-07 11:39:36 +0100840 { .compatible = "renesas,rmobile-iic", .data = &default_dt_config },
Wolfram Sang67240df2014-05-02 21:15:16 +0200841 {},
842};
843MODULE_DEVICE_TABLE(of, sh_mobile_i2c_dt_ids);
844
Wolfram Sang2d095812014-11-07 11:11:41 +0100845static void sh_mobile_i2c_release_dma(struct sh_mobile_i2c_data *pd)
846{
Wolfram Sange844a792014-12-16 13:31:25 +0100847 if (!IS_ERR(pd->dma_tx)) {
Wolfram Sang2d095812014-11-07 11:11:41 +0100848 dma_release_channel(pd->dma_tx);
Wolfram Sange844a792014-12-16 13:31:25 +0100849 pd->dma_tx = ERR_PTR(-EPROBE_DEFER);
Wolfram Sang2d095812014-11-07 11:11:41 +0100850 }
851
Wolfram Sange844a792014-12-16 13:31:25 +0100852 if (!IS_ERR(pd->dma_rx)) {
Wolfram Sang2d095812014-11-07 11:11:41 +0100853 dma_release_channel(pd->dma_rx);
Wolfram Sange844a792014-12-16 13:31:25 +0100854 pd->dma_rx = ERR_PTR(-EPROBE_DEFER);
Wolfram Sang2d095812014-11-07 11:11:41 +0100855 }
856}
857
Wolfram Sang530834b2014-12-04 17:20:49 +0100858static int sh_mobile_i2c_hook_irqs(struct platform_device *dev, struct sh_mobile_i2c_data *pd)
Magnus Dammda672772008-04-22 22:16:49 +0200859{
860 struct resource *res;
Wolfram Sang7fe8a992014-05-02 21:15:12 +0200861 resource_size_t n;
862 int k = 0, ret;
Magnus Dammda672772008-04-22 22:16:49 +0200863
864 while ((res = platform_get_resource(dev, IORESOURCE_IRQ, k))) {
Wolfram Sang7fe8a992014-05-02 21:15:12 +0200865 for (n = res->start; n <= res->end; n++) {
866 ret = devm_request_irq(&dev->dev, n, sh_mobile_i2c_isr,
Wolfram Sang530834b2014-12-04 17:20:49 +0100867 0, dev_name(&dev->dev), pd);
Wolfram Sang7fe8a992014-05-02 21:15:12 +0200868 if (ret) {
869 dev_err(&dev->dev, "cannot request IRQ %pa\n", &n);
870 return ret;
Magnus Damm82b20d82010-08-02 07:16:37 +0000871 }
Magnus Dammda672772008-04-22 22:16:49 +0200872 }
873 k++;
874 }
875
Wolfram Sang7fe8a992014-05-02 21:15:12 +0200876 return k > 0 ? 0 : -ENOENT;
Magnus Dammda672772008-04-22 22:16:49 +0200877}
878
879static int sh_mobile_i2c_probe(struct platform_device *dev)
880{
881 struct sh_mobile_i2c_data *pd;
882 struct i2c_adapter *adap;
883 struct resource *res;
Geert Uytterhoevenad59c5e2017-10-04 14:17:05 +0200884 const struct sh_mobile_dt_config *config;
Magnus Dammda672772008-04-22 22:16:49 +0200885 int ret;
Wolfram Sang88c289e2014-05-02 21:15:09 +0200886 u32 bus_speed;
Magnus Dammda672772008-04-22 22:16:49 +0200887
Wolfram Sang4fd31c22014-05-02 21:15:11 +0200888 pd = devm_kzalloc(&dev->dev, sizeof(struct sh_mobile_i2c_data), GFP_KERNEL);
889 if (!pd)
Magnus Dammda672772008-04-22 22:16:49 +0200890 return -ENOMEM;
Magnus Dammda672772008-04-22 22:16:49 +0200891
Wolfram Sang4fd31c22014-05-02 21:15:11 +0200892 pd->clk = devm_clk_get(&dev->dev, NULL);
Magnus Dammda672772008-04-22 22:16:49 +0200893 if (IS_ERR(pd->clk)) {
Magnus Damm1082d5d2011-04-21 22:20:39 +0900894 dev_err(&dev->dev, "cannot get clock\n");
Wolfram Sang4fd31c22014-05-02 21:15:11 +0200895 return PTR_ERR(pd->clk);
Magnus Dammda672772008-04-22 22:16:49 +0200896 }
897
Wolfram Sang530834b2014-12-04 17:20:49 +0100898 ret = sh_mobile_i2c_hook_irqs(dev, pd);
Wolfram Sang7fe8a992014-05-02 21:15:12 +0200899 if (ret)
Wolfram Sang4fd31c22014-05-02 21:15:11 +0200900 return ret;
Magnus Dammda672772008-04-22 22:16:49 +0200901
902 pd->dev = &dev->dev;
903 platform_set_drvdata(dev, pd);
904
905 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
Magnus Dammda672772008-04-22 22:16:49 +0200906
Wolfram Sang55f5f982014-12-16 13:31:26 +0100907 pd->res = res;
Wolfram Sang4fd31c22014-05-02 21:15:11 +0200908 pd->reg = devm_ioremap_resource(&dev->dev, res);
Wolfram Sang7fe8a992014-05-02 21:15:12 +0200909 if (IS_ERR(pd->reg))
910 return PTR_ERR(pd->reg);
Magnus Dammda672772008-04-22 22:16:49 +0200911
Wolfram Sang88c289e2014-05-02 21:15:09 +0200912 ret = of_property_read_u32(dev->dev.of_node, "clock-frequency", &bus_speed);
913 pd->bus_speed = ret ? STANDARD_MODE : bus_speed;
Shinya Kuribayashiebd5ac12012-10-24 19:58:10 +0900914 pd->clks_per_count = 1;
Wolfram Sang67240df2014-05-02 21:15:16 +0200915
Geert Uytterhoevenad59c5e2017-10-04 14:17:05 +0200916 config = of_device_get_match_data(&dev->dev);
917 if (config) {
Wolfram Sang90b84c02017-05-18 23:11:40 +0200918 pd->clks_per_count = config->clks_per_count;
Wolfram Sang67240df2014-05-02 21:15:16 +0200919
Wolfram Sang90b84c02017-05-18 23:11:40 +0200920 if (config->setup)
921 config->setup(pd);
Wolfram Sang67240df2014-05-02 21:15:16 +0200922 }
Magnus Damm81f81152011-04-28 13:25:36 +0900923
Magnus Damm962b6032010-03-11 10:06:02 +0000924 /* The IIC blocks on SH-Mobile ARM processors
925 * come with two new bits in ICIC.
926 */
Wolfram Sang4fd31c22014-05-02 21:15:11 +0200927 if (resource_size(res) > 0x17)
Magnus Damm962b6032010-03-11 10:06:02 +0000928 pd->flags |= IIC_FLAG_HAS_ICIC67;
929
Wolfram Sang6ed70532014-05-02 21:15:14 +0200930 ret = sh_mobile_i2c_init(pd);
931 if (ret)
932 return ret;
Shinya Kuribayashi7b0e6292012-10-24 19:56:51 +0900933
Wolfram Sang2d095812014-11-07 11:11:41 +0100934 /* Init DMA */
935 sg_init_table(&pd->sg, 1);
936 pd->dma_direction = DMA_NONE;
Wolfram Sang55f5f982014-12-16 13:31:26 +0100937 pd->dma_rx = pd->dma_tx = ERR_PTR(-EPROBE_DEFER);
Wolfram Sang2d095812014-11-07 11:11:41 +0100938
Magnus Dammf1a3b992009-08-14 10:48:59 +0000939 /* Enable Runtime PM for this device.
940 *
941 * Also tell the Runtime PM core to ignore children
942 * for this device since it is valid for us to suspend
943 * this I2C master driver even though the slave devices
944 * on the I2C bus may not be suspended.
945 *
946 * The state of the I2C hardware bus is unaffected by
947 * the Runtime PM state.
948 */
949 pm_suspend_ignore_children(&dev->dev, true);
950 pm_runtime_enable(&dev->dev);
951
Magnus Dammda672772008-04-22 22:16:49 +0200952 /* setup the private data */
953 adap = &pd->adap;
954 i2c_set_adapdata(adap, pd);
955
956 adap->owner = THIS_MODULE;
957 adap->algo = &sh_mobile_i2c_algorithm;
958 adap->dev.parent = &dev->dev;
959 adap->retries = 5;
960 adap->nr = dev->id;
Magnus Dammad337072012-03-30 17:44:02 +0900961 adap->dev.of_node = dev->dev.of_node;
Magnus Dammda672772008-04-22 22:16:49 +0200962
963 strlcpy(adap->name, dev->name, sizeof(adap->name));
964
Magnus Damma5616bd2008-10-31 20:20:55 +0900965 spin_lock_init(&pd->lock);
966 init_waitqueue_head(&pd->wait);
Magnus Dammda672772008-04-22 22:16:49 +0200967
968 ret = i2c_add_numbered_adapter(adap);
969 if (ret < 0) {
Wolfram Sang2d095812014-11-07 11:11:41 +0100970 sh_mobile_i2c_release_dma(pd);
Wolfram Sang7fe8a992014-05-02 21:15:12 +0200971 return ret;
Magnus Dammda672772008-04-22 22:16:49 +0200972 }
973
Wolfram Sang55f5f982014-12-16 13:31:26 +0100974 dev_info(&dev->dev, "I2C adapter %d, bus speed %lu Hz\n", adap->nr, pd->bus_speed);
Magnus Dammad337072012-03-30 17:44:02 +0900975
Magnus Dammda672772008-04-22 22:16:49 +0200976 return 0;
Magnus Dammda672772008-04-22 22:16:49 +0200977}
978
979static int sh_mobile_i2c_remove(struct platform_device *dev)
980{
981 struct sh_mobile_i2c_data *pd = platform_get_drvdata(dev);
982
983 i2c_del_adapter(&pd->adap);
Wolfram Sang2d095812014-11-07 11:11:41 +0100984 sh_mobile_i2c_release_dma(pd);
Magnus Dammf1a3b992009-08-14 10:48:59 +0000985 pm_runtime_disable(&dev->dev);
Magnus Dammda672772008-04-22 22:16:49 +0200986 return 0;
987}
988
Magnus Dammf1a3b992009-08-14 10:48:59 +0000989static int sh_mobile_i2c_runtime_nop(struct device *dev)
990{
991 /* Runtime PM callback shared between ->runtime_suspend()
992 * and ->runtime_resume(). Simply returns success.
993 *
994 * This driver re-initializes all registers after
995 * pm_runtime_get_sync() anyway so there is no need
996 * to save and restore registers here.
997 */
998 return 0;
999}
1000
Alexey Dobriyan47145212009-12-14 18:00:08 -08001001static const struct dev_pm_ops sh_mobile_i2c_dev_pm_ops = {
Magnus Dammf1a3b992009-08-14 10:48:59 +00001002 .runtime_suspend = sh_mobile_i2c_runtime_nop,
1003 .runtime_resume = sh_mobile_i2c_runtime_nop,
1004};
1005
Magnus Dammda672772008-04-22 22:16:49 +02001006static struct platform_driver sh_mobile_i2c_driver = {
1007 .driver = {
1008 .name = "i2c-sh_mobile",
Magnus Dammf1a3b992009-08-14 10:48:59 +00001009 .pm = &sh_mobile_i2c_dev_pm_ops,
Magnus Dammad337072012-03-30 17:44:02 +09001010 .of_match_table = sh_mobile_i2c_dt_ids,
Magnus Dammda672772008-04-22 22:16:49 +02001011 },
1012 .probe = sh_mobile_i2c_probe,
1013 .remove = sh_mobile_i2c_remove,
1014};
1015
1016static int __init sh_mobile_i2c_adap_init(void)
1017{
1018 return platform_driver_register(&sh_mobile_i2c_driver);
1019}
Wolfram Sang2d095812014-11-07 11:11:41 +01001020subsys_initcall(sh_mobile_i2c_adap_init);
Magnus Dammda672772008-04-22 22:16:49 +02001021
1022static void __exit sh_mobile_i2c_adap_exit(void)
1023{
1024 platform_driver_unregister(&sh_mobile_i2c_driver);
1025}
Magnus Dammda672772008-04-22 22:16:49 +02001026module_exit(sh_mobile_i2c_adap_exit);
1027
1028MODULE_DESCRIPTION("SuperH Mobile I2C Bus Controller driver");
Wolfram Sang2d095812014-11-07 11:11:41 +01001029MODULE_AUTHOR("Magnus Damm and Wolfram Sang");
Magnus Dammda672772008-04-22 22:16:49 +02001030MODULE_LICENSE("GPL v2");
Guennadi Liakhovetski7ef0c122011-04-15 20:18:57 +02001031MODULE_ALIAS("platform:i2c-sh_mobile");