1 // SPDX-License-Identifier: GPL-2.0
3  * ddbridge-i2c.c: Digital Devices bridge i2c driver
5  * Copyright (C) 2010-2017 Digital Devices GmbH
20 #include <linux/i2c.h>
25 #include "ddbridge-i2c.h"
26 #include "ddbridge-regs.h"
27 #include "ddbridge-io.h"
31 static int ddb_i2c_cmd(struct ddb_i2c *i2c, u32 adr, u32 cmd)  in ddb_i2c_cmd()  argument
33 	struct ddb *dev = i2c->dev;  in ddb_i2c_cmd()
37 	ddbwritel(dev, (adr << 9) | cmd, i2c->regs + I2C_COMMAND);  in ddb_i2c_cmd()
38 	stat = wait_for_completion_timeout(&i2c->completion, HZ);  in ddb_i2c_cmd()
39 	val = ddbreadl(dev, i2c->regs + I2C_COMMAND);  in ddb_i2c_cmd()
40 	if (stat == 0) {  in ddb_i2c_cmd()
41 		dev_err(dev->dev, "I2C timeout, card %d, port %d, link %u\n",  in ddb_i2c_cmd()
42 			dev->nr, i2c->nr, i2c->link);  in ddb_i2c_cmd()
46 			dev_err(dev->dev, "DDBridge IRS %08x\n", istat);  in ddb_i2c_cmd()
47 			if (i2c->link) {  in ddb_i2c_cmd()
49 					DDB_LINK_TAG(i2c->link) |  in ddb_i2c_cmd()
52 				dev_err(dev->dev, "DDBridge link %u IRS %08x\n",  in ddb_i2c_cmd()
53 					i2c->link, listat);  in ddb_i2c_cmd()
59 					i2c->regs + I2C_MONITOR);  in ddb_i2c_cmd()
61 				dev_err(dev->dev, "I2C cmd=%08x mon=%08x\n",  in ddb_i2c_cmd()
65 		return -EIO;  in ddb_i2c_cmd()
67 	val &= 0x70000;  in ddb_i2c_cmd()
68 	if (val == 0x20000)  in ddb_i2c_cmd()
69 		dev_err(dev->dev, "I2C bus error\n");  in ddb_i2c_cmd()
71 		return -EIO;  in ddb_i2c_cmd()
72 	return 0;  in ddb_i2c_cmd()
78 	struct ddb_i2c *i2c = (struct ddb_i2c *)i2c_get_adapdata(adapter);  in ddb_i2c_master_xfer()  local
79 	struct ddb *dev = i2c->dev;  in ddb_i2c_master_xfer()
80 	u8 addr = 0;  in ddb_i2c_master_xfer()
82 	addr = msg[0].addr;  in ddb_i2c_master_xfer()
83 	if (msg[0].len > i2c->bsize)  in ddb_i2c_master_xfer()
84 		return -EIO;  in ddb_i2c_master_xfer()
87 		if (msg[0].flags & I2C_M_RD) {  in ddb_i2c_master_xfer()
88 			ddbwritel(dev, msg[0].len << 16,  in ddb_i2c_master_xfer()
89 				  i2c->regs + I2C_TASKLENGTH);  in ddb_i2c_master_xfer()
90 			if (ddb_i2c_cmd(i2c, addr, 3))  in ddb_i2c_master_xfer()
92 			ddbcpyfrom(dev, msg[0].buf,  in ddb_i2c_master_xfer()
93 				   i2c->rbuf, msg[0].len);  in ddb_i2c_master_xfer()
96 		ddbcpyto(dev, i2c->wbuf, msg[0].buf, msg[0].len);  in ddb_i2c_master_xfer()
97 		ddbwritel(dev, msg[0].len, i2c->regs + I2C_TASKLENGTH);  in ddb_i2c_master_xfer()
98 		if (ddb_i2c_cmd(i2c, addr, 2))  in ddb_i2c_master_xfer()
102 		if ((msg[0].flags & I2C_M_RD) == I2C_M_RD)  in ddb_i2c_master_xfer()
106 		if (msg[1].len > i2c->bsize)  in ddb_i2c_master_xfer()
108 		ddbcpyto(dev, i2c->wbuf, msg[0].buf, msg[0].len);  in ddb_i2c_master_xfer()
109 		ddbwritel(dev, msg[0].len | (msg[1].len << 16),  in ddb_i2c_master_xfer()
110 			  i2c->regs + I2C_TASKLENGTH);  in ddb_i2c_master_xfer()
111 		if (ddb_i2c_cmd(i2c, addr, 1))  in ddb_i2c_master_xfer()
114 			   i2c->rbuf,  in ddb_i2c_master_xfer()
120 	return -EIO;  in ddb_i2c_master_xfer()
136 	struct ddb_i2c *i2c;  in ddb_i2c_release()  local
138 	for (i = 0; i < dev->i2c_num; i++) {  in ddb_i2c_release()
139 		i2c = &dev->i2c[i];  in ddb_i2c_release()
140 		i2c_del_adapter(&i2c->adap);  in ddb_i2c_release()
146 	struct ddb_i2c *i2c = (struct ddb_i2c *)priv;  in i2c_handler()  local
148 	complete(&i2c->completion);  in i2c_handler()
151 static int ddb_i2c_add(struct ddb *dev, struct ddb_i2c *i2c,  in ddb_i2c_add()  argument
157 	i2c->nr = i;  in ddb_i2c_add()
158 	i2c->dev = dev;  in ddb_i2c_add()
159 	i2c->link = link;  in ddb_i2c_add()
160 	i2c->bsize = regmap->i2c_buf->size;  in ddb_i2c_add()
161 	i2c->wbuf = DDB_LINK_TAG(link) |  in ddb_i2c_add()
162 		(regmap->i2c_buf->base + i2c->bsize * i);  in ddb_i2c_add()
163 	i2c->rbuf = i2c->wbuf; /* + i2c->bsize / 2 */  in ddb_i2c_add()
164 	i2c->regs = DDB_LINK_TAG(link) |  in ddb_i2c_add()
165 		(regmap->i2c->base + regmap->i2c->size * i);  in ddb_i2c_add()
166 	ddbwritel(dev, I2C_SPEED_100, i2c->regs + I2C_TIMING);  in ddb_i2c_add()
167 	ddbwritel(dev, ((i2c->rbuf & 0xffff) << 16) | (i2c->wbuf & 0xffff),  in ddb_i2c_add()
168 		  i2c->regs + I2C_TASKADDRESS);  in ddb_i2c_add()
169 	init_completion(&i2c->completion);  in ddb_i2c_add()
171 	adap = &i2c->adap;  in ddb_i2c_add()
172 	i2c_set_adapdata(adap, i2c);  in ddb_i2c_add()
174 	adap->class = I2C_ADAP_CLASS_TV_DIGITAL | I2C_CLASS_TV_ANALOG;  in ddb_i2c_add()
177 	adap->class = I2C_CLASS_TV_ANALOG;  in ddb_i2c_add()
180 	snprintf(adap->name, I2C_NAME_SIZE, "ddbridge_%02x.%x.%x",  in ddb_i2c_add()
181 		 dev->nr, i2c->link, i);  in ddb_i2c_add()
182 	adap->algo = &ddb_i2c_algo;  in ddb_i2c_add()
183 	adap->algo_data = (void *)i2c;  in ddb_i2c_add()
184 	adap->dev.parent = dev->dev;  in ddb_i2c_add()
190 	int stat = 0;  in ddb_i2c_init()
191 	u32 i, j, num = 0, l, base;  in ddb_i2c_init()
192 	struct ddb_i2c *i2c;  in ddb_i2c_init()  local
196 	for (l = 0; l < DDB_MAX_LINK; l++) {  in ddb_i2c_init()
197 		if (!dev->link[l].info)  in ddb_i2c_init()
199 		regmap = dev->link[l].info->regmap;  in ddb_i2c_init()
200 		if (!regmap || !regmap->i2c)  in ddb_i2c_init()
202 		base = regmap->irq_base_i2c;  in ddb_i2c_init()
203 		for (i = 0; i < regmap->i2c->num; i++) {  in ddb_i2c_init()
204 			if (!(dev->link[l].info->i2c_mask & (1 << i)))  in ddb_i2c_init()
206 			i2c = &dev->i2c[num];  in ddb_i2c_init()
207 			ddb_irq_set(dev, l, i + base, i2c_handler, i2c);  in ddb_i2c_init()
208 			stat = ddb_i2c_add(dev, i2c, regmap, l, i, num);  in ddb_i2c_init()
215 		for (j = 0; j < num; j++) {  in ddb_i2c_init()
216 			i2c = &dev->i2c[j];  in ddb_i2c_init()
217 			adap = &i2c->adap;  in ddb_i2c_init()
221 		dev->i2c_num = num;  in ddb_i2c_init()