1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * ddbridge-i2c.c: Digital Devices bridge i2c driver
4 *
5 * Copyright (C) 2010-2017 Digital Devices GmbH
6 * Ralph Metzler <rjkm@metzlerbros.de>
7 * Marcus Metzler <mocm@metzlerbros.de>
8 */
9
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/interrupt.h>
13 #include <linux/delay.h>
14 #include <linux/slab.h>
15 #include <linux/poll.h>
16 #include <linux/io.h>
17 #include <linux/pci.h>
18 #include <linux/pci_ids.h>
19 #include <linux/timer.h>
20 #include <linux/i2c.h>
21 #include <linux/swab.h>
22 #include <linux/vmalloc.h>
23
24 #include "ddbridge.h"
25 #include "ddbridge-i2c.h"
26 #include "ddbridge-regs.h"
27 #include "ddbridge-io.h"
28
29 /******************************************************************************/
30
ddb_i2c_cmd(struct ddb_i2c * i2c,u32 adr,u32 cmd)31 static int ddb_i2c_cmd(struct ddb_i2c *i2c, u32 adr, u32 cmd)
32 {
33 struct ddb *dev = i2c->dev;
34 unsigned long stat;
35 u32 val;
36
37 ddbwritel(dev, (adr << 9) | cmd, i2c->regs + I2C_COMMAND);
38 stat = wait_for_completion_timeout(&i2c->completion, HZ);
39 val = ddbreadl(dev, i2c->regs + I2C_COMMAND);
40 if (stat == 0) {
41 dev_err(dev->dev, "I2C timeout, card %d, port %d, link %u\n",
42 dev->nr, i2c->nr, i2c->link);
43 {
44 u32 istat = ddbreadl(dev, INTERRUPT_STATUS);
45
46 dev_err(dev->dev, "DDBridge IRS %08x\n", istat);
47 if (i2c->link) {
48 u32 listat = ddbreadl(dev,
49 DDB_LINK_TAG(i2c->link) |
50 INTERRUPT_STATUS);
51
52 dev_err(dev->dev, "DDBridge link %u IRS %08x\n",
53 i2c->link, listat);
54 }
55 if (istat & 1) {
56 ddbwritel(dev, istat & 1, INTERRUPT_ACK);
57 } else {
58 u32 mon = ddbreadl(dev,
59 i2c->regs + I2C_MONITOR);
60
61 dev_err(dev->dev, "I2C cmd=%08x mon=%08x\n",
62 val, mon);
63 }
64 }
65 return -EIO;
66 }
67 val &= 0x70000;
68 if (val == 0x20000)
69 dev_err(dev->dev, "I2C bus error\n");
70 if (val)
71 return -EIO;
72 return 0;
73 }
74
ddb_i2c_master_xfer(struct i2c_adapter * adapter,struct i2c_msg msg[],int num)75 static int ddb_i2c_master_xfer(struct i2c_adapter *adapter,
76 struct i2c_msg msg[], int num)
77 {
78 struct ddb_i2c *i2c = (struct ddb_i2c *)i2c_get_adapdata(adapter);
79 struct ddb *dev = i2c->dev;
80 u8 addr = 0;
81
82 addr = msg[0].addr;
83 if (msg[0].len > i2c->bsize)
84 return -EIO;
85 switch (num) {
86 case 1:
87 if (msg[0].flags & I2C_M_RD) {
88 ddbwritel(dev, msg[0].len << 16,
89 i2c->regs + I2C_TASKLENGTH);
90 if (ddb_i2c_cmd(i2c, addr, 3))
91 break;
92 ddbcpyfrom(dev, msg[0].buf,
93 i2c->rbuf, msg[0].len);
94 return num;
95 }
96 ddbcpyto(dev, i2c->wbuf, msg[0].buf, msg[0].len);
97 ddbwritel(dev, msg[0].len, i2c->regs + I2C_TASKLENGTH);
98 if (ddb_i2c_cmd(i2c, addr, 2))
99 break;
100 return num;
101 case 2:
102 if ((msg[0].flags & I2C_M_RD) == I2C_M_RD)
103 break;
104 if ((msg[1].flags & I2C_M_RD) != I2C_M_RD)
105 break;
106 if (msg[1].len > i2c->bsize)
107 break;
108 ddbcpyto(dev, i2c->wbuf, msg[0].buf, msg[0].len);
109 ddbwritel(dev, msg[0].len | (msg[1].len << 16),
110 i2c->regs + I2C_TASKLENGTH);
111 if (ddb_i2c_cmd(i2c, addr, 1))
112 break;
113 ddbcpyfrom(dev, msg[1].buf,
114 i2c->rbuf,
115 msg[1].len);
116 return num;
117 default:
118 break;
119 }
120 return -EIO;
121 }
122
ddb_i2c_functionality(struct i2c_adapter * adap)123 static u32 ddb_i2c_functionality(struct i2c_adapter *adap)
124 {
125 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
126 }
127
128 static const struct i2c_algorithm ddb_i2c_algo = {
129 .master_xfer = ddb_i2c_master_xfer,
130 .functionality = ddb_i2c_functionality,
131 };
132
ddb_i2c_release(struct ddb * dev)133 void ddb_i2c_release(struct ddb *dev)
134 {
135 int i;
136 struct ddb_i2c *i2c;
137
138 for (i = 0; i < dev->i2c_num; i++) {
139 i2c = &dev->i2c[i];
140 i2c_del_adapter(&i2c->adap);
141 }
142 }
143
i2c_handler(void * priv)144 static void i2c_handler(void *priv)
145 {
146 struct ddb_i2c *i2c = (struct ddb_i2c *)priv;
147
148 complete(&i2c->completion);
149 }
150
ddb_i2c_add(struct ddb * dev,struct ddb_i2c * i2c,const struct ddb_regmap * regmap,int link,int i,int num)151 static int ddb_i2c_add(struct ddb *dev, struct ddb_i2c *i2c,
152 const struct ddb_regmap *regmap, int link,
153 int i, int num)
154 {
155 struct i2c_adapter *adap;
156
157 i2c->nr = i;
158 i2c->dev = dev;
159 i2c->link = link;
160 i2c->bsize = regmap->i2c_buf->size;
161 i2c->wbuf = DDB_LINK_TAG(link) |
162 (regmap->i2c_buf->base + i2c->bsize * i);
163 i2c->rbuf = i2c->wbuf; /* + i2c->bsize / 2 */
164 i2c->regs = DDB_LINK_TAG(link) |
165 (regmap->i2c->base + regmap->i2c->size * i);
166 ddbwritel(dev, I2C_SPEED_100, i2c->regs + I2C_TIMING);
167 ddbwritel(dev, ((i2c->rbuf & 0xffff) << 16) | (i2c->wbuf & 0xffff),
168 i2c->regs + I2C_TASKADDRESS);
169 init_completion(&i2c->completion);
170
171 adap = &i2c->adap;
172 i2c_set_adapdata(adap, i2c);
173 #ifdef I2C_ADAP_CLASS_TV_DIGITAL
174 adap->class = I2C_ADAP_CLASS_TV_DIGITAL | I2C_CLASS_TV_ANALOG;
175 #else
176 #ifdef I2C_CLASS_TV_ANALOG
177 adap->class = I2C_CLASS_TV_ANALOG;
178 #endif
179 #endif
180 snprintf(adap->name, I2C_NAME_SIZE, "ddbridge_%02x.%x.%x",
181 dev->nr, i2c->link, i);
182 adap->algo = &ddb_i2c_algo;
183 adap->algo_data = (void *)i2c;
184 adap->dev.parent = dev->dev;
185 return i2c_add_adapter(adap);
186 }
187
ddb_i2c_init(struct ddb * dev)188 int ddb_i2c_init(struct ddb *dev)
189 {
190 int stat = 0;
191 u32 i, j, num = 0, l, base;
192 struct ddb_i2c *i2c;
193 struct i2c_adapter *adap;
194 const struct ddb_regmap *regmap;
195
196 for (l = 0; l < DDB_MAX_LINK; l++) {
197 if (!dev->link[l].info)
198 continue;
199 regmap = dev->link[l].info->regmap;
200 if (!regmap || !regmap->i2c)
201 continue;
202 base = regmap->irq_base_i2c;
203 for (i = 0; i < regmap->i2c->num; i++) {
204 if (!(dev->link[l].info->i2c_mask & (1 << i)))
205 continue;
206 i2c = &dev->i2c[num];
207 ddb_irq_set(dev, l, i + base, i2c_handler, i2c);
208 stat = ddb_i2c_add(dev, i2c, regmap, l, i, num);
209 if (stat)
210 break;
211 num++;
212 }
213 }
214 if (stat) {
215 for (j = 0; j < num; j++) {
216 i2c = &dev->i2c[j];
217 adap = &i2c->adap;
218 i2c_del_adapter(adap);
219 }
220 } else {
221 dev->i2c_num = num;
222 }
223
224 return stat;
225 }
226