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10#include <common.h>
11#include <i2c.h>
12#include <linker_lists.h>
13#include <asm/global_data.h>
14
15struct i2c_adapter *i2c_get_adapter(int index)
16{
17 struct i2c_adapter *i2c_adap_p = ll_entry_start(struct i2c_adapter,
18 i2c);
19 int max = ll_entry_count(struct i2c_adapter, i2c);
20 int i;
21
22 if (index >= max) {
23 printf("Error, wrong i2c adapter %d max %d possible\n",
24 index, max);
25 return i2c_adap_p;
26 }
27 if (index == 0)
28 return i2c_adap_p;
29
30 for (i = 0; i < index; i++)
31 i2c_adap_p++;
32
33 return i2c_adap_p;
34}
35
36#if !defined(CONFIG_SYS_I2C_DIRECT_BUS)
37struct i2c_bus_hose i2c_bus[CONFIG_SYS_NUM_I2C_BUSES] =
38 CONFIG_SYS_I2C_BUSES;
39#endif
40
41DECLARE_GLOBAL_DATA_PTR;
42
43#ifndef CONFIG_SYS_I2C_DIRECT_BUS
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60static int i2c_mux_set(struct i2c_adapter *adap, int mux_id, int chip,
61 int channel)
62{
63 uint8_t buf;
64 int ret;
65
66
67 if (channel < 0) {
68 buf = 0;
69 ret = adap->write(adap, chip, 0, 0, &buf, 1);
70 if (ret)
71 printf("%s: Could not turn off the mux.\n", __func__);
72 return ret;
73 }
74
75 switch (mux_id) {
76 case I2C_MUX_PCA9540_ID:
77 case I2C_MUX_PCA9542_ID:
78 if (channel > 1)
79 return -1;
80 buf = (uint8_t)((channel & 0x01) | (1 << 2));
81 break;
82 case I2C_MUX_PCA9544_ID:
83 if (channel > 3)
84 return -1;
85 buf = (uint8_t)((channel & 0x03) | (1 << 2));
86 break;
87 case I2C_MUX_PCA9547_ID:
88 if (channel > 7)
89 return -1;
90 buf = (uint8_t)((channel & 0x07) | (1 << 3));
91 break;
92 case I2C_MUX_PCA9548_ID:
93 if (channel > 7)
94 return -1;
95 buf = (uint8_t)(0x01 << channel);
96 break;
97 default:
98 printf("%s: wrong mux id: %d\n", __func__, mux_id);
99 return -1;
100 }
101
102 ret = adap->write(adap, chip, 0, 0, &buf, 1);
103 if (ret)
104 printf("%s: could not set mux: id: %d chip: %x channel: %d\n",
105 __func__, mux_id, chip, channel);
106 return ret;
107}
108
109static int i2c_mux_set_all(void)
110{
111 struct i2c_bus_hose *i2c_bus_tmp = &i2c_bus[I2C_BUS];
112 int i;
113
114
115 if (i2c_bus_tmp->next_hop[0].chip != 0) {
116
117 for (i = 0; i < CONFIG_SYS_I2C_MAX_HOPS; i++) {
118 int ret;
119
120 if (i2c_bus_tmp->next_hop[i].chip == 0)
121 break;
122
123 ret = i2c_mux_set(I2C_ADAP,
124 i2c_bus_tmp->next_hop[i].mux.id,
125 i2c_bus_tmp->next_hop[i].chip,
126 i2c_bus_tmp->next_hop[i].channel);
127 if (ret != 0)
128 return ret;
129 }
130 }
131 return 0;
132}
133
134static int i2c_mux_disconnect_all(void)
135{
136 struct i2c_bus_hose *i2c_bus_tmp = &i2c_bus[I2C_BUS];
137 int i;
138 uint8_t buf = 0;
139
140 if (I2C_ADAP->init_done == 0)
141 return 0;
142
143
144 if ((i2c_bus_tmp->next_hop[0].chip != 0) &&
145 (I2C_ADAP->init_done != 0)) {
146 i = CONFIG_SYS_I2C_MAX_HOPS;
147 do {
148 uint8_t chip;
149 int ret;
150
151 chip = i2c_bus_tmp->next_hop[--i].chip;
152 if (chip == 0)
153 continue;
154
155 ret = I2C_ADAP->write(I2C_ADAP, chip, 0, 0, &buf, 1);
156 if (ret != 0) {
157 printf("i2c: mux disconnect error\n");
158 return ret;
159 }
160 } while (i > 0);
161 }
162
163 return 0;
164}
165#endif
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173
174static void i2c_init_bus(unsigned int bus_no, int speed, int slaveaddr)
175{
176 if (bus_no >= CONFIG_SYS_NUM_I2C_BUSES)
177 return;
178
179 I2C_ADAP->init(I2C_ADAP, speed, slaveaddr);
180
181 if (gd->flags & GD_FLG_RELOC) {
182 I2C_ADAP->init_done = 1;
183 I2C_ADAP->speed = speed;
184 I2C_ADAP->slaveaddr = slaveaddr;
185 }
186}
187
188
189__weak void i2c_init_board(void)
190{
191}
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201void i2c_init_all(void)
202{
203 i2c_init_board();
204 i2c_set_bus_num(CONFIG_SYS_SPD_BUS_NUM);
205 return;
206}
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213
214unsigned int i2c_get_bus_num(void)
215{
216 return gd->cur_i2c_bus;
217}
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232
233int i2c_set_bus_num(unsigned int bus)
234{
235 int max;
236
237 if ((bus == I2C_BUS) && (I2C_ADAP->init_done > 0))
238 return 0;
239
240#ifndef CONFIG_SYS_I2C_DIRECT_BUS
241 if (bus >= CONFIG_SYS_NUM_I2C_BUSES)
242 return -1;
243#endif
244
245 max = ll_entry_count(struct i2c_adapter, i2c);
246 if (I2C_ADAPTER(bus) >= max) {
247 printf("Error, wrong i2c adapter %d max %d possible\n",
248 I2C_ADAPTER(bus), max);
249 return -2;
250 }
251
252#ifndef CONFIG_SYS_I2C_DIRECT_BUS
253 i2c_mux_disconnect_all();
254#endif
255
256 gd->cur_i2c_bus = bus;
257 if (I2C_ADAP->init_done == 0)
258 i2c_init_bus(bus, I2C_ADAP->speed, I2C_ADAP->slaveaddr);
259
260#ifndef CONFIG_SYS_I2C_DIRECT_BUS
261 i2c_mux_set_all();
262#endif
263 return 0;
264}
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270int i2c_probe(uint8_t chip)
271{
272 return I2C_ADAP->probe(I2C_ADAP, chip);
273}
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287int i2c_read(uint8_t chip, unsigned int addr, int alen,
288 uint8_t *buffer, int len)
289{
290 return I2C_ADAP->read(I2C_ADAP, chip, addr, alen, buffer, len);
291}
292
293int i2c_write(uint8_t chip, unsigned int addr, int alen,
294 uint8_t *buffer, int len)
295{
296 return I2C_ADAP->write(I2C_ADAP, chip, addr, alen, buffer, len);
297}
298
299unsigned int i2c_set_bus_speed(unsigned int speed)
300{
301 unsigned int ret;
302
303 if (I2C_ADAP->set_bus_speed == NULL)
304 return 0;
305 ret = I2C_ADAP->set_bus_speed(I2C_ADAP, speed);
306 if (gd->flags & GD_FLG_RELOC)
307 I2C_ADAP->speed = (ret == 0) ? speed : 0;
308
309 return ret;
310}
311
312unsigned int i2c_get_bus_speed(void)
313{
314 struct i2c_adapter *cur = I2C_ADAP;
315 return cur->speed;
316}
317
318uint8_t i2c_reg_read(uint8_t addr, uint8_t reg)
319{
320 uint8_t buf;
321
322 i2c_read(addr, reg, 1, &buf, 1);
323
324#ifdef DEBUG
325 printf("%s: bus=%d addr=0x%02x, reg=0x%02x, val=0x%02x\n",
326 __func__, i2c_get_bus_num(), addr, reg, buf);
327#endif
328
329 return buf;
330}
331
332void i2c_reg_write(uint8_t addr, uint8_t reg, uint8_t val)
333{
334#ifdef DEBUG
335 printf("%s: bus=%d addr=0x%02x, reg=0x%02x, val=0x%02x\n",
336 __func__, i2c_get_bus_num(), addr, reg, val);
337#endif
338
339 i2c_write(addr, reg, 1, &val, 1);
340}
341
342__weak void i2c_init(int speed, int slaveaddr)
343{
344 i2c_init_bus(i2c_get_bus_num(), speed, slaveaddr);
345}
346