]>
Commit | Line | Data |
---|---|---|
2403f8f4 VK |
1 | /* |
2 | * (C) Copyright 2009 | |
3 | * Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com. | |
4 | * | |
1a459660 | 5 | * SPDX-License-Identifier: GPL-2.0+ |
2403f8f4 VK |
6 | */ |
7 | ||
8 | #include <common.h> | |
9 | #include <asm/io.h> | |
10 | #include <asm/arch/hardware.h> | |
031ed2fa | 11 | #include "designware_i2c.h" |
2403f8f4 | 12 | |
ac6e2fe6 AV |
13 | #ifdef CONFIG_I2C_MULTI_BUS |
14 | static unsigned int bus_initialized[CONFIG_SYS_I2C_BUS_MAX]; | |
15 | static unsigned int current_bus = 0; | |
16 | #endif | |
17 | ||
18 | static struct i2c_regs *i2c_regs_p = | |
2403f8f4 VK |
19 | (struct i2c_regs *)CONFIG_SYS_I2C_BASE; |
20 | ||
21 | /* | |
22 | * set_speed - Set the i2c speed mode (standard, high, fast) | |
23 | * @i2c_spd: required i2c speed mode | |
24 | * | |
25 | * Set the i2c speed mode (standard, high, fast) | |
26 | */ | |
27 | static void set_speed(int i2c_spd) | |
28 | { | |
29 | unsigned int cntl; | |
30 | unsigned int hcnt, lcnt; | |
5e3e8dda AV |
31 | unsigned int enbl; |
32 | ||
33 | /* to set speed cltr must be disabled */ | |
34 | enbl = readl(&i2c_regs_p->ic_enable); | |
35 | enbl &= ~IC_ENABLE_0B; | |
36 | writel(enbl, &i2c_regs_p->ic_enable); | |
37 | ||
2403f8f4 VK |
38 | cntl = (readl(&i2c_regs_p->ic_con) & (~IC_CON_SPD_MSK)); |
39 | ||
40 | switch (i2c_spd) { | |
41 | case IC_SPEED_MODE_MAX: | |
42 | cntl |= IC_CON_SPD_HS; | |
5b8439bb AV |
43 | hcnt = (IC_CLK * MIN_HS_SCL_HIGHTIME) / NANO_TO_MICRO; |
44 | writel(hcnt, &i2c_regs_p->ic_hs_scl_hcnt); | |
45 | lcnt = (IC_CLK * MIN_HS_SCL_LOWTIME) / NANO_TO_MICRO; | |
46 | writel(lcnt, &i2c_regs_p->ic_hs_scl_lcnt); | |
2403f8f4 VK |
47 | break; |
48 | ||
49 | case IC_SPEED_MODE_STANDARD: | |
50 | cntl |= IC_CON_SPD_SS; | |
5b8439bb AV |
51 | hcnt = (IC_CLK * MIN_SS_SCL_HIGHTIME) / NANO_TO_MICRO; |
52 | writel(hcnt, &i2c_regs_p->ic_ss_scl_hcnt); | |
53 | lcnt = (IC_CLK * MIN_SS_SCL_LOWTIME) / NANO_TO_MICRO; | |
54 | writel(lcnt, &i2c_regs_p->ic_ss_scl_lcnt); | |
2403f8f4 VK |
55 | break; |
56 | ||
57 | case IC_SPEED_MODE_FAST: | |
58 | default: | |
59 | cntl |= IC_CON_SPD_FS; | |
5b8439bb AV |
60 | hcnt = (IC_CLK * MIN_FS_SCL_HIGHTIME) / NANO_TO_MICRO; |
61 | writel(hcnt, &i2c_regs_p->ic_fs_scl_hcnt); | |
62 | lcnt = (IC_CLK * MIN_FS_SCL_LOWTIME) / NANO_TO_MICRO; | |
63 | writel(lcnt, &i2c_regs_p->ic_fs_scl_lcnt); | |
2403f8f4 VK |
64 | break; |
65 | } | |
66 | ||
67 | writel(cntl, &i2c_regs_p->ic_con); | |
68 | ||
5b8439bb | 69 | /* Enable back i2c now speed set */ |
5e3e8dda AV |
70 | enbl |= IC_ENABLE_0B; |
71 | writel(enbl, &i2c_regs_p->ic_enable); | |
2403f8f4 VK |
72 | } |
73 | ||
74 | /* | |
75 | * i2c_set_bus_speed - Set the i2c speed | |
76 | * @speed: required i2c speed | |
77 | * | |
78 | * Set the i2c speed. | |
79 | */ | |
496ba48f | 80 | int i2c_set_bus_speed(int speed) |
2403f8f4 VK |
81 | { |
82 | if (speed >= I2C_MAX_SPEED) | |
83 | set_speed(IC_SPEED_MODE_MAX); | |
84 | else if (speed >= I2C_FAST_SPEED) | |
85 | set_speed(IC_SPEED_MODE_FAST); | |
86 | else | |
87 | set_speed(IC_SPEED_MODE_STANDARD); | |
496ba48f SR |
88 | |
89 | return 0; | |
2403f8f4 VK |
90 | } |
91 | ||
92 | /* | |
93 | * i2c_get_bus_speed - Gets the i2c speed | |
94 | * | |
95 | * Gets the i2c speed. | |
96 | */ | |
97 | int i2c_get_bus_speed(void) | |
98 | { | |
99 | u32 cntl; | |
100 | ||
101 | cntl = (readl(&i2c_regs_p->ic_con) & IC_CON_SPD_MSK); | |
102 | ||
103 | if (cntl == IC_CON_SPD_HS) | |
104 | return I2C_MAX_SPEED; | |
105 | else if (cntl == IC_CON_SPD_FS) | |
106 | return I2C_FAST_SPEED; | |
107 | else if (cntl == IC_CON_SPD_SS) | |
108 | return I2C_STANDARD_SPEED; | |
109 | ||
110 | return 0; | |
111 | } | |
112 | ||
113 | /* | |
114 | * i2c_init - Init function | |
115 | * @speed: required i2c speed | |
031ed2fa | 116 | * @slaveadd: slave address for the device |
2403f8f4 VK |
117 | * |
118 | * Initialization function. | |
119 | */ | |
120 | void i2c_init(int speed, int slaveadd) | |
121 | { | |
122 | unsigned int enbl; | |
123 | ||
124 | /* Disable i2c */ | |
125 | enbl = readl(&i2c_regs_p->ic_enable); | |
126 | enbl &= ~IC_ENABLE_0B; | |
127 | writel(enbl, &i2c_regs_p->ic_enable); | |
128 | ||
129 | writel((IC_CON_SD | IC_CON_SPD_FS | IC_CON_MM), &i2c_regs_p->ic_con); | |
130 | writel(IC_RX_TL, &i2c_regs_p->ic_rx_tl); | |
131 | writel(IC_TX_TL, &i2c_regs_p->ic_tx_tl); | |
132 | i2c_set_bus_speed(speed); | |
133 | writel(IC_STOP_DET, &i2c_regs_p->ic_intr_mask); | |
134 | writel(slaveadd, &i2c_regs_p->ic_sar); | |
135 | ||
136 | /* Enable i2c */ | |
137 | enbl = readl(&i2c_regs_p->ic_enable); | |
138 | enbl |= IC_ENABLE_0B; | |
139 | writel(enbl, &i2c_regs_p->ic_enable); | |
ac6e2fe6 AV |
140 | |
141 | #ifdef CONFIG_I2C_MULTI_BUS | |
142 | bus_initialized[current_bus] = 1; | |
143 | #endif | |
2403f8f4 VK |
144 | } |
145 | ||
146 | /* | |
147 | * i2c_setaddress - Sets the target slave address | |
148 | * @i2c_addr: target i2c address | |
149 | * | |
150 | * Sets the target slave address. | |
151 | */ | |
152 | static void i2c_setaddress(unsigned int i2c_addr) | |
153 | { | |
154 | writel(i2c_addr, &i2c_regs_p->ic_tar); | |
155 | } | |
156 | ||
157 | /* | |
158 | * i2c_flush_rxfifo - Flushes the i2c RX FIFO | |
159 | * | |
160 | * Flushes the i2c RX FIFO | |
161 | */ | |
162 | static void i2c_flush_rxfifo(void) | |
163 | { | |
164 | while (readl(&i2c_regs_p->ic_status) & IC_STATUS_RFNE) | |
165 | readl(&i2c_regs_p->ic_cmd_data); | |
166 | } | |
167 | ||
168 | /* | |
169 | * i2c_wait_for_bb - Waits for bus busy | |
170 | * | |
171 | * Waits for bus busy | |
172 | */ | |
173 | static int i2c_wait_for_bb(void) | |
174 | { | |
175 | unsigned long start_time_bb = get_timer(0); | |
176 | ||
177 | while ((readl(&i2c_regs_p->ic_status) & IC_STATUS_MA) || | |
178 | !(readl(&i2c_regs_p->ic_status) & IC_STATUS_TFE)) { | |
179 | ||
180 | /* Evaluate timeout */ | |
181 | if (get_timer(start_time_bb) > (unsigned long)(I2C_BYTE_TO_BB)) | |
182 | return 1; | |
183 | } | |
184 | ||
185 | return 0; | |
186 | } | |
187 | ||
188 | /* check parameters for i2c_read and i2c_write */ | |
189 | static int check_params(uint addr, int alen, uchar *buffer, int len) | |
190 | { | |
191 | if (buffer == NULL) { | |
192 | printf("Buffer is invalid\n"); | |
193 | return 1; | |
194 | } | |
195 | ||
196 | if (alen > 1) { | |
197 | printf("addr len %d not supported\n", alen); | |
198 | return 1; | |
199 | } | |
200 | ||
201 | if (addr + len > 256) { | |
202 | printf("address out of range\n"); | |
203 | return 1; | |
204 | } | |
205 | ||
206 | return 0; | |
207 | } | |
208 | ||
209 | static int i2c_xfer_init(uchar chip, uint addr) | |
210 | { | |
496ba48f | 211 | if (i2c_wait_for_bb()) |
2403f8f4 | 212 | return 1; |
2403f8f4 VK |
213 | |
214 | i2c_setaddress(chip); | |
215 | writel(addr, &i2c_regs_p->ic_cmd_data); | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
220 | static int i2c_xfer_finish(void) | |
221 | { | |
222 | ulong start_stop_det = get_timer(0); | |
223 | ||
224 | while (1) { | |
225 | if ((readl(&i2c_regs_p->ic_raw_intr_stat) & IC_STOP_DET)) { | |
226 | readl(&i2c_regs_p->ic_clr_stop_det); | |
227 | break; | |
228 | } else if (get_timer(start_stop_det) > I2C_STOPDET_TO) { | |
229 | break; | |
230 | } | |
231 | } | |
232 | ||
233 | if (i2c_wait_for_bb()) { | |
234 | printf("Timed out waiting for bus\n"); | |
235 | return 1; | |
236 | } | |
237 | ||
238 | i2c_flush_rxfifo(); | |
239 | ||
240 | /* Wait for read/write operation to complete on actual memory */ | |
241 | udelay(10000); | |
242 | ||
243 | return 0; | |
244 | } | |
245 | ||
246 | /* | |
247 | * i2c_read - Read from i2c memory | |
248 | * @chip: target i2c address | |
249 | * @addr: address to read from | |
250 | * @alen: | |
251 | * @buffer: buffer for read data | |
252 | * @len: no of bytes to be read | |
253 | * | |
254 | * Read from i2c memory. | |
255 | */ | |
256 | int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len) | |
257 | { | |
258 | unsigned long start_time_rx; | |
259 | ||
260 | if (check_params(addr, alen, buffer, len)) | |
261 | return 1; | |
262 | ||
263 | if (i2c_xfer_init(chip, addr)) | |
264 | return 1; | |
265 | ||
266 | start_time_rx = get_timer(0); | |
267 | while (len) { | |
491739bb AV |
268 | if (len == 1) |
269 | writel(IC_CMD | IC_STOP, &i2c_regs_p->ic_cmd_data); | |
270 | else | |
271 | writel(IC_CMD, &i2c_regs_p->ic_cmd_data); | |
2403f8f4 VK |
272 | |
273 | if (readl(&i2c_regs_p->ic_status) & IC_STATUS_RFNE) { | |
274 | *buffer++ = (uchar)readl(&i2c_regs_p->ic_cmd_data); | |
275 | len--; | |
276 | start_time_rx = get_timer(0); | |
277 | ||
278 | } else if (get_timer(start_time_rx) > I2C_BYTE_TO) { | |
2403f8f4 VK |
279 | return 1; |
280 | } | |
281 | } | |
282 | ||
283 | return i2c_xfer_finish(); | |
284 | } | |
285 | ||
286 | /* | |
287 | * i2c_write - Write to i2c memory | |
288 | * @chip: target i2c address | |
289 | * @addr: address to read from | |
290 | * @alen: | |
291 | * @buffer: buffer for read data | |
292 | * @len: no of bytes to be read | |
293 | * | |
294 | * Write to i2c memory. | |
295 | */ | |
296 | int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len) | |
297 | { | |
298 | int nb = len; | |
299 | unsigned long start_time_tx; | |
300 | ||
301 | if (check_params(addr, alen, buffer, len)) | |
302 | return 1; | |
303 | ||
304 | if (i2c_xfer_init(chip, addr)) | |
305 | return 1; | |
306 | ||
307 | start_time_tx = get_timer(0); | |
308 | while (len) { | |
309 | if (readl(&i2c_regs_p->ic_status) & IC_STATUS_TFNF) { | |
491739bb AV |
310 | if (--len == 0) |
311 | writel(*buffer | IC_STOP, &i2c_regs_p->ic_cmd_data); | |
312 | else | |
313 | writel(*buffer, &i2c_regs_p->ic_cmd_data); | |
2403f8f4 | 314 | buffer++; |
2403f8f4 VK |
315 | start_time_tx = get_timer(0); |
316 | ||
317 | } else if (get_timer(start_time_tx) > (nb * I2C_BYTE_TO)) { | |
318 | printf("Timed out. i2c write Failed\n"); | |
319 | return 1; | |
320 | } | |
321 | } | |
322 | ||
323 | return i2c_xfer_finish(); | |
324 | } | |
325 | ||
326 | /* | |
327 | * i2c_probe - Probe the i2c chip | |
328 | */ | |
329 | int i2c_probe(uchar chip) | |
330 | { | |
331 | u32 tmp; | |
496ba48f | 332 | int ret; |
2403f8f4 VK |
333 | |
334 | /* | |
335 | * Try to read the first location of the chip. | |
336 | */ | |
496ba48f SR |
337 | ret = i2c_read(chip, 0, 1, (uchar *)&tmp, 1); |
338 | if (ret) | |
339 | i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE); | |
340 | ||
341 | return ret; | |
2403f8f4 | 342 | } |
ac6e2fe6 AV |
343 | |
344 | #ifdef CONFIG_I2C_MULTI_BUS | |
345 | int i2c_set_bus_num(unsigned int bus) | |
346 | { | |
347 | switch (bus) { | |
348 | case 0: | |
349 | i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE; | |
350 | break; | |
351 | #ifdef CONFIG_SYS_I2C_BASE1 | |
352 | case 1: | |
353 | i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE1; | |
354 | break; | |
355 | #endif | |
356 | #ifdef CONFIG_SYS_I2C_BASE2 | |
357 | case 2: | |
358 | i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE2; | |
359 | break; | |
360 | #endif | |
361 | #ifdef CONFIG_SYS_I2C_BASE3 | |
362 | case 3: | |
363 | i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE3; | |
364 | break; | |
365 | #endif | |
366 | #ifdef CONFIG_SYS_I2C_BASE4 | |
367 | case 4: | |
368 | i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE4; | |
369 | break; | |
370 | #endif | |
371 | #ifdef CONFIG_SYS_I2C_BASE5 | |
372 | case 5: | |
373 | i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE5; | |
374 | break; | |
375 | #endif | |
376 | #ifdef CONFIG_SYS_I2C_BASE6 | |
377 | case 6: | |
378 | i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE6; | |
379 | break; | |
380 | #endif | |
381 | #ifdef CONFIG_SYS_I2C_BASE7 | |
382 | case 7: | |
383 | i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE7; | |
384 | break; | |
385 | #endif | |
386 | #ifdef CONFIG_SYS_I2C_BASE8 | |
387 | case 8: | |
388 | i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE8; | |
389 | break; | |
390 | #endif | |
391 | #ifdef CONFIG_SYS_I2C_BASE9 | |
392 | case 9: | |
393 | i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE9; | |
394 | break; | |
395 | #endif | |
396 | default: | |
397 | printf("Bad bus: %d\n", bus); | |
398 | return -1; | |
399 | } | |
400 | ||
401 | current_bus = bus; | |
402 | ||
403 | if (!bus_initialized[current_bus]) | |
404 | i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE); | |
405 | ||
406 | return 0; | |
407 | } | |
408 | ||
409 | int i2c_get_bus_num(void) | |
410 | { | |
411 | return current_bus; | |
412 | } | |
413 | #endif |