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1802d0be | 1 | // SPDX-License-Identifier: GPL-2.0-only |
ce38815d XC |
2 | /* |
3 | * Copyright (c) 2014 MediaTek Inc. | |
4 | * Author: Xudong Chen <xudong.chen@mediatek.com> | |
ce38815d XC |
5 | */ |
6 | ||
7 | #include <linux/clk.h> | |
8 | #include <linux/completion.h> | |
9 | #include <linux/delay.h> | |
10 | #include <linux/device.h> | |
11 | #include <linux/dma-mapping.h> | |
12 | #include <linux/err.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/i2c.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/io.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/mm.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/of_address.h> | |
6e29577f | 22 | #include <linux/of_device.h> |
ce38815d XC |
23 | #include <linux/of_irq.h> |
24 | #include <linux/platform_device.h> | |
25 | #include <linux/scatterlist.h> | |
26 | #include <linux/sched.h> | |
27 | #include <linux/slab.h> | |
28 | ||
b2ed11e2 | 29 | #define I2C_RS_TRANSFER (1 << 4) |
cad6dc5d | 30 | #define I2C_ARB_LOST (1 << 3) |
ce38815d XC |
31 | #define I2C_HS_NACKERR (1 << 2) |
32 | #define I2C_ACKERR (1 << 1) | |
33 | #define I2C_TRANSAC_COMP (1 << 0) | |
34 | #define I2C_TRANSAC_START (1 << 0) | |
b2ed11e2 EH |
35 | #define I2C_RS_MUL_CNFG (1 << 15) |
36 | #define I2C_RS_MUL_TRIG (1 << 14) | |
ce38815d XC |
37 | #define I2C_DCM_DISABLE 0x0000 |
38 | #define I2C_IO_CONFIG_OPEN_DRAIN 0x0003 | |
39 | #define I2C_IO_CONFIG_PUSH_PULL 0x0000 | |
40 | #define I2C_SOFT_RST 0x0001 | |
41 | #define I2C_FIFO_ADDR_CLR 0x0001 | |
42 | #define I2C_DELAY_LEN 0x0002 | |
43 | #define I2C_ST_START_CON 0x8001 | |
44 | #define I2C_FS_START_CON 0x1800 | |
45 | #define I2C_TIME_CLR_VALUE 0x0000 | |
46 | #define I2C_TIME_DEFAULT_VALUE 0x0003 | |
ce38815d XC |
47 | #define I2C_WRRD_TRANAC_VALUE 0x0002 |
48 | #define I2C_RD_TRANAC_VALUE 0x0001 | |
49 | ||
50 | #define I2C_DMA_CON_TX 0x0000 | |
51 | #define I2C_DMA_CON_RX 0x0001 | |
52 | #define I2C_DMA_START_EN 0x0001 | |
53 | #define I2C_DMA_INT_FLAG_NONE 0x0000 | |
54 | #define I2C_DMA_CLR_FLAG 0x0000 | |
ea89ef1f | 55 | #define I2C_DMA_HARD_RST 0x0002 |
f4f4fed6 | 56 | #define I2C_DMA_4G_MODE 0x0001 |
ce38815d | 57 | |
5a10e7d7 | 58 | #define I2C_DEFAULT_CLK_DIV 5 |
ce38815d XC |
59 | #define I2C_DEFAULT_SPEED 100000 /* hz */ |
60 | #define MAX_FS_MODE_SPEED 400000 | |
61 | #define MAX_HS_MODE_SPEED 3400000 | |
62 | #define MAX_SAMPLE_CNT_DIV 8 | |
63 | #define MAX_STEP_CNT_DIV 64 | |
64 | #define MAX_HS_STEP_CNT_DIV 8 | |
65 | ||
66 | #define I2C_CONTROL_RS (0x1 << 1) | |
67 | #define I2C_CONTROL_DMA_EN (0x1 << 2) | |
68 | #define I2C_CONTROL_CLK_EXT_EN (0x1 << 3) | |
69 | #define I2C_CONTROL_DIR_CHANGE (0x1 << 4) | |
70 | #define I2C_CONTROL_ACKERR_DET_EN (0x1 << 5) | |
71 | #define I2C_CONTROL_TRANSFER_LEN_CHANGE (0x1 << 6) | |
a15c91ba QW |
72 | #define I2C_CONTROL_DMAACK_EN (0x1 << 8) |
73 | #define I2C_CONTROL_ASYNC_MODE (0x1 << 9) | |
ce38815d XC |
74 | #define I2C_CONTROL_WRAPPER (0x1 << 0) |
75 | ||
76 | #define I2C_DRV_NAME "i2c-mt65xx" | |
77 | ||
78 | enum DMA_REGS_OFFSET { | |
79 | OFFSET_INT_FLAG = 0x0, | |
80 | OFFSET_INT_EN = 0x04, | |
81 | OFFSET_EN = 0x08, | |
ea89ef1f | 82 | OFFSET_RST = 0x0c, |
ce38815d XC |
83 | OFFSET_CON = 0x18, |
84 | OFFSET_TX_MEM_ADDR = 0x1c, | |
85 | OFFSET_RX_MEM_ADDR = 0x20, | |
86 | OFFSET_TX_LEN = 0x24, | |
87 | OFFSET_RX_LEN = 0x28, | |
f4f4fed6 LZ |
88 | OFFSET_TX_4G_MODE = 0x54, |
89 | OFFSET_RX_4G_MODE = 0x58, | |
ce38815d XC |
90 | }; |
91 | ||
92 | enum i2c_trans_st_rs { | |
93 | I2C_TRANS_STOP = 0, | |
94 | I2C_TRANS_REPEATED_START, | |
95 | }; | |
96 | ||
97 | enum mtk_trans_op { | |
98 | I2C_MASTER_WR = 1, | |
99 | I2C_MASTER_RD, | |
100 | I2C_MASTER_WRRD, | |
101 | }; | |
102 | ||
103 | enum I2C_REGS_OFFSET { | |
bc6eaf17 QW |
104 | OFFSET_DATA_PORT, |
105 | OFFSET_SLAVE_ADDR, | |
106 | OFFSET_INTR_MASK, | |
107 | OFFSET_INTR_STAT, | |
108 | OFFSET_CONTROL, | |
109 | OFFSET_TRANSFER_LEN, | |
110 | OFFSET_TRANSAC_LEN, | |
111 | OFFSET_DELAY_LEN, | |
112 | OFFSET_TIMING, | |
113 | OFFSET_START, | |
114 | OFFSET_EXT_CONF, | |
115 | OFFSET_FIFO_STAT, | |
116 | OFFSET_FIFO_THRESH, | |
117 | OFFSET_FIFO_ADDR_CLR, | |
118 | OFFSET_IO_CONFIG, | |
119 | OFFSET_RSV_DEBUG, | |
120 | OFFSET_HS, | |
121 | OFFSET_SOFTRESET, | |
122 | OFFSET_DCM_EN, | |
123 | OFFSET_PATH_DIR, | |
124 | OFFSET_DEBUGSTAT, | |
125 | OFFSET_DEBUGCTRL, | |
126 | OFFSET_TRANSFER_LEN_AUX, | |
127 | OFFSET_CLOCK_DIV, | |
25708278 | 128 | OFFSET_LTIMING, |
bc6eaf17 QW |
129 | }; |
130 | ||
131 | static const u16 mt_i2c_regs_v1[] = { | |
132 | [OFFSET_DATA_PORT] = 0x0, | |
133 | [OFFSET_SLAVE_ADDR] = 0x4, | |
134 | [OFFSET_INTR_MASK] = 0x8, | |
135 | [OFFSET_INTR_STAT] = 0xc, | |
136 | [OFFSET_CONTROL] = 0x10, | |
137 | [OFFSET_TRANSFER_LEN] = 0x14, | |
138 | [OFFSET_TRANSAC_LEN] = 0x18, | |
139 | [OFFSET_DELAY_LEN] = 0x1c, | |
140 | [OFFSET_TIMING] = 0x20, | |
141 | [OFFSET_START] = 0x24, | |
142 | [OFFSET_EXT_CONF] = 0x28, | |
143 | [OFFSET_FIFO_STAT] = 0x30, | |
144 | [OFFSET_FIFO_THRESH] = 0x34, | |
145 | [OFFSET_FIFO_ADDR_CLR] = 0x38, | |
146 | [OFFSET_IO_CONFIG] = 0x40, | |
147 | [OFFSET_RSV_DEBUG] = 0x44, | |
148 | [OFFSET_HS] = 0x48, | |
149 | [OFFSET_SOFTRESET] = 0x50, | |
150 | [OFFSET_DCM_EN] = 0x54, | |
151 | [OFFSET_PATH_DIR] = 0x60, | |
152 | [OFFSET_DEBUGSTAT] = 0x64, | |
153 | [OFFSET_DEBUGCTRL] = 0x68, | |
154 | [OFFSET_TRANSFER_LEN_AUX] = 0x6c, | |
155 | [OFFSET_CLOCK_DIV] = 0x70, | |
ce38815d XC |
156 | }; |
157 | ||
25708278 QW |
158 | static const u16 mt_i2c_regs_v2[] = { |
159 | [OFFSET_DATA_PORT] = 0x0, | |
160 | [OFFSET_SLAVE_ADDR] = 0x4, | |
161 | [OFFSET_INTR_MASK] = 0x8, | |
162 | [OFFSET_INTR_STAT] = 0xc, | |
163 | [OFFSET_CONTROL] = 0x10, | |
164 | [OFFSET_TRANSFER_LEN] = 0x14, | |
165 | [OFFSET_TRANSAC_LEN] = 0x18, | |
166 | [OFFSET_DELAY_LEN] = 0x1c, | |
167 | [OFFSET_TIMING] = 0x20, | |
168 | [OFFSET_START] = 0x24, | |
169 | [OFFSET_EXT_CONF] = 0x28, | |
170 | [OFFSET_LTIMING] = 0x2c, | |
171 | [OFFSET_HS] = 0x30, | |
172 | [OFFSET_IO_CONFIG] = 0x34, | |
173 | [OFFSET_FIFO_ADDR_CLR] = 0x38, | |
174 | [OFFSET_TRANSFER_LEN_AUX] = 0x44, | |
175 | [OFFSET_CLOCK_DIV] = 0x48, | |
176 | [OFFSET_SOFTRESET] = 0x50, | |
177 | [OFFSET_DEBUGSTAT] = 0xe0, | |
178 | [OFFSET_DEBUGCTRL] = 0xe8, | |
179 | [OFFSET_FIFO_STAT] = 0xf4, | |
180 | [OFFSET_FIFO_THRESH] = 0xf8, | |
181 | [OFFSET_DCM_EN] = 0xf88, | |
182 | }; | |
183 | ||
ce38815d XC |
184 | struct mtk_i2c_compatible { |
185 | const struct i2c_adapter_quirks *quirks; | |
bc6eaf17 | 186 | const u16 *regs; |
ce38815d XC |
187 | unsigned char pmic_i2c: 1; |
188 | unsigned char dcm: 1; | |
b2ed11e2 | 189 | unsigned char auto_restart: 1; |
173b77e8 | 190 | unsigned char aux_len_reg: 1; |
f4f4fed6 | 191 | unsigned char support_33bits: 1; |
5a10e7d7 | 192 | unsigned char timing_adjust: 1; |
a15c91ba | 193 | unsigned char dma_sync: 1; |
25708278 | 194 | unsigned char ltiming_adjust: 1; |
ce38815d XC |
195 | }; |
196 | ||
197 | struct mtk_i2c { | |
198 | struct i2c_adapter adap; /* i2c host adapter */ | |
199 | struct device *dev; | |
200 | struct completion msg_complete; | |
201 | ||
202 | /* set in i2c probe */ | |
203 | void __iomem *base; /* i2c base addr */ | |
204 | void __iomem *pdmabase; /* dma base address*/ | |
205 | struct clk *clk_main; /* main clock for i2c bus */ | |
206 | struct clk *clk_dma; /* DMA clock for i2c via DMA */ | |
207 | struct clk *clk_pmic; /* PMIC clock for i2c from PMIC */ | |
cad6dc5d | 208 | struct clk *clk_arb; /* Arbitrator clock for i2c */ |
ce38815d XC |
209 | bool have_pmic; /* can use i2c pins from PMIC */ |
210 | bool use_push_pull; /* IO config push-pull mode */ | |
211 | ||
212 | u16 irq_stat; /* interrupt status */ | |
f2326401 | 213 | unsigned int clk_src_div; |
ce38815d XC |
214 | unsigned int speed_hz; /* The speed in transfer */ |
215 | enum mtk_trans_op op; | |
216 | u16 timing_reg; | |
217 | u16 high_speed_reg; | |
25708278 | 218 | u16 ltiming_reg; |
173b77e8 | 219 | unsigned char auto_restart; |
8378d01f | 220 | bool ignore_restart_irq; |
ce38815d XC |
221 | const struct mtk_i2c_compatible *dev_comp; |
222 | }; | |
223 | ||
224 | static const struct i2c_adapter_quirks mt6577_i2c_quirks = { | |
225 | .flags = I2C_AQ_COMB_WRITE_THEN_READ, | |
226 | .max_num_msgs = 1, | |
227 | .max_write_len = 255, | |
228 | .max_read_len = 255, | |
229 | .max_comb_1st_msg_len = 255, | |
230 | .max_comb_2nd_msg_len = 31, | |
231 | }; | |
232 | ||
1304fe09 JG |
233 | static const struct i2c_adapter_quirks mt7622_i2c_quirks = { |
234 | .max_num_msgs = 255, | |
235 | }; | |
236 | ||
abf4923e HYW |
237 | static const struct i2c_adapter_quirks mt8183_i2c_quirks = { |
238 | .flags = I2C_AQ_NO_ZERO_LEN, | |
239 | }; | |
240 | ||
5a10e7d7 | 241 | static const struct mtk_i2c_compatible mt2712_compat = { |
bc6eaf17 | 242 | .regs = mt_i2c_regs_v1, |
5a10e7d7 JG |
243 | .pmic_i2c = 0, |
244 | .dcm = 1, | |
245 | .auto_restart = 1, | |
246 | .aux_len_reg = 1, | |
247 | .support_33bits = 1, | |
248 | .timing_adjust = 1, | |
a15c91ba | 249 | .dma_sync = 0, |
25708278 | 250 | .ltiming_adjust = 0, |
5a10e7d7 JG |
251 | }; |
252 | ||
ce38815d XC |
253 | static const struct mtk_i2c_compatible mt6577_compat = { |
254 | .quirks = &mt6577_i2c_quirks, | |
bc6eaf17 | 255 | .regs = mt_i2c_regs_v1, |
ce38815d XC |
256 | .pmic_i2c = 0, |
257 | .dcm = 1, | |
b2ed11e2 | 258 | .auto_restart = 0, |
173b77e8 | 259 | .aux_len_reg = 0, |
f4f4fed6 | 260 | .support_33bits = 0, |
5a10e7d7 | 261 | .timing_adjust = 0, |
a15c91ba | 262 | .dma_sync = 0, |
25708278 | 263 | .ltiming_adjust = 0, |
ce38815d XC |
264 | }; |
265 | ||
266 | static const struct mtk_i2c_compatible mt6589_compat = { | |
267 | .quirks = &mt6577_i2c_quirks, | |
bc6eaf17 | 268 | .regs = mt_i2c_regs_v1, |
ce38815d XC |
269 | .pmic_i2c = 1, |
270 | .dcm = 0, | |
b2ed11e2 | 271 | .auto_restart = 0, |
173b77e8 | 272 | .aux_len_reg = 0, |
f4f4fed6 | 273 | .support_33bits = 0, |
5a10e7d7 | 274 | .timing_adjust = 0, |
a15c91ba | 275 | .dma_sync = 0, |
25708278 | 276 | .ltiming_adjust = 0, |
b2ed11e2 EH |
277 | }; |
278 | ||
1304fe09 JG |
279 | static const struct mtk_i2c_compatible mt7622_compat = { |
280 | .quirks = &mt7622_i2c_quirks, | |
bc6eaf17 | 281 | .regs = mt_i2c_regs_v1, |
1304fe09 JG |
282 | .pmic_i2c = 0, |
283 | .dcm = 1, | |
284 | .auto_restart = 1, | |
285 | .aux_len_reg = 1, | |
286 | .support_33bits = 0, | |
5a10e7d7 | 287 | .timing_adjust = 0, |
a15c91ba | 288 | .dma_sync = 0, |
25708278 | 289 | .ltiming_adjust = 0, |
1304fe09 JG |
290 | }; |
291 | ||
b2ed11e2 | 292 | static const struct mtk_i2c_compatible mt8173_compat = { |
bc6eaf17 | 293 | .regs = mt_i2c_regs_v1, |
b2ed11e2 EH |
294 | .pmic_i2c = 0, |
295 | .dcm = 1, | |
296 | .auto_restart = 1, | |
173b77e8 | 297 | .aux_len_reg = 1, |
f4f4fed6 | 298 | .support_33bits = 1, |
5a10e7d7 | 299 | .timing_adjust = 0, |
a15c91ba | 300 | .dma_sync = 0, |
25708278 QW |
301 | .ltiming_adjust = 0, |
302 | }; | |
303 | ||
304 | static const struct mtk_i2c_compatible mt8183_compat = { | |
abf4923e | 305 | .quirks = &mt8183_i2c_quirks, |
25708278 QW |
306 | .regs = mt_i2c_regs_v2, |
307 | .pmic_i2c = 0, | |
308 | .dcm = 0, | |
309 | .auto_restart = 1, | |
310 | .aux_len_reg = 1, | |
311 | .support_33bits = 1, | |
312 | .timing_adjust = 1, | |
313 | .dma_sync = 1, | |
314 | .ltiming_adjust = 1, | |
ce38815d XC |
315 | }; |
316 | ||
317 | static const struct of_device_id mtk_i2c_of_match[] = { | |
5a10e7d7 | 318 | { .compatible = "mediatek,mt2712-i2c", .data = &mt2712_compat }, |
ce38815d XC |
319 | { .compatible = "mediatek,mt6577-i2c", .data = &mt6577_compat }, |
320 | { .compatible = "mediatek,mt6589-i2c", .data = &mt6589_compat }, | |
1304fe09 | 321 | { .compatible = "mediatek,mt7622-i2c", .data = &mt7622_compat }, |
b2ed11e2 | 322 | { .compatible = "mediatek,mt8173-i2c", .data = &mt8173_compat }, |
25708278 | 323 | { .compatible = "mediatek,mt8183-i2c", .data = &mt8183_compat }, |
ce38815d XC |
324 | {} |
325 | }; | |
326 | MODULE_DEVICE_TABLE(of, mtk_i2c_of_match); | |
327 | ||
bc6eaf17 QW |
328 | static u16 mtk_i2c_readw(struct mtk_i2c *i2c, enum I2C_REGS_OFFSET reg) |
329 | { | |
330 | return readw(i2c->base + i2c->dev_comp->regs[reg]); | |
331 | } | |
332 | ||
333 | static void mtk_i2c_writew(struct mtk_i2c *i2c, u16 val, | |
334 | enum I2C_REGS_OFFSET reg) | |
335 | { | |
336 | writew(val, i2c->base + i2c->dev_comp->regs[reg]); | |
337 | } | |
338 | ||
ce38815d XC |
339 | static int mtk_i2c_clock_enable(struct mtk_i2c *i2c) |
340 | { | |
341 | int ret; | |
342 | ||
343 | ret = clk_prepare_enable(i2c->clk_dma); | |
344 | if (ret) | |
345 | return ret; | |
346 | ||
347 | ret = clk_prepare_enable(i2c->clk_main); | |
348 | if (ret) | |
349 | goto err_main; | |
350 | ||
351 | if (i2c->have_pmic) { | |
352 | ret = clk_prepare_enable(i2c->clk_pmic); | |
353 | if (ret) | |
354 | goto err_pmic; | |
355 | } | |
cad6dc5d QW |
356 | |
357 | if (i2c->clk_arb) { | |
358 | ret = clk_prepare_enable(i2c->clk_arb); | |
359 | if (ret) | |
360 | goto err_arb; | |
361 | } | |
362 | ||
ce38815d XC |
363 | return 0; |
364 | ||
cad6dc5d QW |
365 | err_arb: |
366 | if (i2c->have_pmic) | |
367 | clk_disable_unprepare(i2c->clk_pmic); | |
ce38815d XC |
368 | err_pmic: |
369 | clk_disable_unprepare(i2c->clk_main); | |
370 | err_main: | |
371 | clk_disable_unprepare(i2c->clk_dma); | |
372 | ||
373 | return ret; | |
374 | } | |
375 | ||
376 | static void mtk_i2c_clock_disable(struct mtk_i2c *i2c) | |
377 | { | |
cad6dc5d QW |
378 | if (i2c->clk_arb) |
379 | clk_disable_unprepare(i2c->clk_arb); | |
380 | ||
ce38815d XC |
381 | if (i2c->have_pmic) |
382 | clk_disable_unprepare(i2c->clk_pmic); | |
383 | ||
384 | clk_disable_unprepare(i2c->clk_main); | |
385 | clk_disable_unprepare(i2c->clk_dma); | |
386 | } | |
387 | ||
388 | static void mtk_i2c_init_hw(struct mtk_i2c *i2c) | |
389 | { | |
390 | u16 control_reg; | |
391 | ||
bc6eaf17 | 392 | mtk_i2c_writew(i2c, I2C_SOFT_RST, OFFSET_SOFTRESET); |
ce38815d XC |
393 | |
394 | /* Set ioconfig */ | |
395 | if (i2c->use_push_pull) | |
bc6eaf17 | 396 | mtk_i2c_writew(i2c, I2C_IO_CONFIG_PUSH_PULL, OFFSET_IO_CONFIG); |
ce38815d | 397 | else |
bc6eaf17 | 398 | mtk_i2c_writew(i2c, I2C_IO_CONFIG_OPEN_DRAIN, OFFSET_IO_CONFIG); |
ce38815d XC |
399 | |
400 | if (i2c->dev_comp->dcm) | |
bc6eaf17 | 401 | mtk_i2c_writew(i2c, I2C_DCM_DISABLE, OFFSET_DCM_EN); |
ce38815d | 402 | |
5a10e7d7 | 403 | if (i2c->dev_comp->timing_adjust) |
bc6eaf17 | 404 | mtk_i2c_writew(i2c, I2C_DEFAULT_CLK_DIV - 1, OFFSET_CLOCK_DIV); |
5a10e7d7 | 405 | |
bc6eaf17 QW |
406 | mtk_i2c_writew(i2c, i2c->timing_reg, OFFSET_TIMING); |
407 | mtk_i2c_writew(i2c, i2c->high_speed_reg, OFFSET_HS); | |
25708278 QW |
408 | if (i2c->dev_comp->ltiming_adjust) |
409 | mtk_i2c_writew(i2c, i2c->ltiming_reg, OFFSET_LTIMING); | |
ce38815d XC |
410 | |
411 | /* If use i2c pin from PMIC mt6397 side, need set PATH_DIR first */ | |
412 | if (i2c->have_pmic) | |
bc6eaf17 | 413 | mtk_i2c_writew(i2c, I2C_CONTROL_WRAPPER, OFFSET_PATH_DIR); |
ce38815d XC |
414 | |
415 | control_reg = I2C_CONTROL_ACKERR_DET_EN | | |
416 | I2C_CONTROL_CLK_EXT_EN | I2C_CONTROL_DMA_EN; | |
a15c91ba QW |
417 | if (i2c->dev_comp->dma_sync) |
418 | control_reg |= I2C_CONTROL_DMAACK_EN | I2C_CONTROL_ASYNC_MODE; | |
419 | ||
bc6eaf17 QW |
420 | mtk_i2c_writew(i2c, control_reg, OFFSET_CONTROL); |
421 | mtk_i2c_writew(i2c, I2C_DELAY_LEN, OFFSET_DELAY_LEN); | |
ea89ef1f EH |
422 | |
423 | writel(I2C_DMA_HARD_RST, i2c->pdmabase + OFFSET_RST); | |
424 | udelay(50); | |
425 | writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_RST); | |
ce38815d XC |
426 | } |
427 | ||
428 | /* | |
429 | * Calculate i2c port speed | |
430 | * | |
431 | * Hardware design: | |
432 | * i2c_bus_freq = parent_clk / (clock_div * 2 * sample_cnt * step_cnt) | |
433 | * clock_div: fixed in hardware, but may be various in different SoCs | |
434 | * | |
435 | * The calculation want to pick the highest bus frequency that is still | |
436 | * less than or equal to i2c->speed_hz. The calculation try to get | |
437 | * sample_cnt and step_cn | |
438 | */ | |
f2326401 JG |
439 | static int mtk_i2c_calculate_speed(struct mtk_i2c *i2c, unsigned int clk_src, |
440 | unsigned int target_speed, | |
441 | unsigned int *timing_step_cnt, | |
442 | unsigned int *timing_sample_cnt) | |
ce38815d | 443 | { |
ce38815d XC |
444 | unsigned int step_cnt; |
445 | unsigned int sample_cnt; | |
446 | unsigned int max_step_cnt; | |
ce38815d XC |
447 | unsigned int base_sample_cnt = MAX_SAMPLE_CNT_DIV; |
448 | unsigned int base_step_cnt; | |
449 | unsigned int opt_div; | |
450 | unsigned int best_mul; | |
451 | unsigned int cnt_mul; | |
452 | ||
ce38815d XC |
453 | if (target_speed > MAX_HS_MODE_SPEED) |
454 | target_speed = MAX_HS_MODE_SPEED; | |
455 | ||
456 | if (target_speed > MAX_FS_MODE_SPEED) | |
457 | max_step_cnt = MAX_HS_STEP_CNT_DIV; | |
458 | else | |
459 | max_step_cnt = MAX_STEP_CNT_DIV; | |
460 | ||
461 | base_step_cnt = max_step_cnt; | |
462 | /* Find the best combination */ | |
463 | opt_div = DIV_ROUND_UP(clk_src >> 1, target_speed); | |
464 | best_mul = MAX_SAMPLE_CNT_DIV * max_step_cnt; | |
465 | ||
466 | /* Search for the best pair (sample_cnt, step_cnt) with | |
467 | * 0 < sample_cnt < MAX_SAMPLE_CNT_DIV | |
468 | * 0 < step_cnt < max_step_cnt | |
469 | * sample_cnt * step_cnt >= opt_div | |
470 | * optimizing for sample_cnt * step_cnt being minimal | |
471 | */ | |
472 | for (sample_cnt = 1; sample_cnt <= MAX_SAMPLE_CNT_DIV; sample_cnt++) { | |
473 | step_cnt = DIV_ROUND_UP(opt_div, sample_cnt); | |
474 | cnt_mul = step_cnt * sample_cnt; | |
475 | if (step_cnt > max_step_cnt) | |
476 | continue; | |
477 | ||
478 | if (cnt_mul < best_mul) { | |
479 | best_mul = cnt_mul; | |
480 | base_sample_cnt = sample_cnt; | |
481 | base_step_cnt = step_cnt; | |
482 | if (best_mul == opt_div) | |
483 | break; | |
484 | } | |
485 | } | |
486 | ||
487 | sample_cnt = base_sample_cnt; | |
488 | step_cnt = base_step_cnt; | |
489 | ||
490 | if ((clk_src / (2 * sample_cnt * step_cnt)) > target_speed) { | |
491 | /* In this case, hardware can't support such | |
492 | * low i2c_bus_freq | |
493 | */ | |
494 | dev_dbg(i2c->dev, "Unsupported speed (%uhz)\n", target_speed); | |
495 | return -EINVAL; | |
496 | } | |
497 | ||
f2326401 JG |
498 | *timing_step_cnt = step_cnt - 1; |
499 | *timing_sample_cnt = sample_cnt - 1; | |
500 | ||
501 | return 0; | |
502 | } | |
503 | ||
504 | static int mtk_i2c_set_speed(struct mtk_i2c *i2c, unsigned int parent_clk) | |
505 | { | |
506 | unsigned int clk_src; | |
507 | unsigned int step_cnt; | |
508 | unsigned int sample_cnt; | |
25708278 QW |
509 | unsigned int l_step_cnt; |
510 | unsigned int l_sample_cnt; | |
f2326401 JG |
511 | unsigned int target_speed; |
512 | int ret; | |
513 | ||
514 | clk_src = parent_clk / i2c->clk_src_div; | |
515 | target_speed = i2c->speed_hz; | |
ce38815d XC |
516 | |
517 | if (target_speed > MAX_FS_MODE_SPEED) { | |
f2326401 JG |
518 | /* Set master code speed register */ |
519 | ret = mtk_i2c_calculate_speed(i2c, clk_src, MAX_FS_MODE_SPEED, | |
25708278 | 520 | &l_step_cnt, &l_sample_cnt); |
f2326401 JG |
521 | if (ret < 0) |
522 | return ret; | |
523 | ||
25708278 | 524 | i2c->timing_reg = (l_sample_cnt << 8) | l_step_cnt; |
f2326401 | 525 | |
ce38815d | 526 | /* Set the high speed mode register */ |
f2326401 JG |
527 | ret = mtk_i2c_calculate_speed(i2c, clk_src, target_speed, |
528 | &step_cnt, &sample_cnt); | |
529 | if (ret < 0) | |
530 | return ret; | |
531 | ||
ce38815d XC |
532 | i2c->high_speed_reg = I2C_TIME_DEFAULT_VALUE | |
533 | (sample_cnt << 12) | (step_cnt << 8); | |
25708278 QW |
534 | |
535 | if (i2c->dev_comp->ltiming_adjust) | |
536 | i2c->ltiming_reg = (l_sample_cnt << 6) | l_step_cnt | | |
537 | (sample_cnt << 12) | (step_cnt << 9); | |
ce38815d | 538 | } else { |
f2326401 JG |
539 | ret = mtk_i2c_calculate_speed(i2c, clk_src, target_speed, |
540 | &step_cnt, &sample_cnt); | |
541 | if (ret < 0) | |
542 | return ret; | |
543 | ||
544 | i2c->timing_reg = (sample_cnt << 8) | step_cnt; | |
545 | ||
ce38815d XC |
546 | /* Disable the high speed transaction */ |
547 | i2c->high_speed_reg = I2C_TIME_CLR_VALUE; | |
25708278 QW |
548 | |
549 | if (i2c->dev_comp->ltiming_adjust) | |
550 | i2c->ltiming_reg = (sample_cnt << 6) | step_cnt; | |
ce38815d XC |
551 | } |
552 | ||
553 | return 0; | |
554 | } | |
555 | ||
f4f4fed6 LZ |
556 | static inline u32 mtk_i2c_set_4g_mode(dma_addr_t addr) |
557 | { | |
558 | return (addr & BIT_ULL(32)) ? I2C_DMA_4G_MODE : I2C_DMA_CLR_FLAG; | |
559 | } | |
560 | ||
b2ed11e2 EH |
561 | static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs, |
562 | int num, int left_num) | |
ce38815d XC |
563 | { |
564 | u16 addr_reg; | |
b2ed11e2 | 565 | u16 start_reg; |
ce38815d | 566 | u16 control_reg; |
b2ed11e2 | 567 | u16 restart_flag = 0; |
f4f4fed6 | 568 | u32 reg_4g_mode; |
fc66b39f JG |
569 | u8 *dma_rd_buf = NULL; |
570 | u8 *dma_wr_buf = NULL; | |
ce38815d XC |
571 | dma_addr_t rpaddr = 0; |
572 | dma_addr_t wpaddr = 0; | |
573 | int ret; | |
574 | ||
575 | i2c->irq_stat = 0; | |
576 | ||
173b77e8 | 577 | if (i2c->auto_restart) |
b2ed11e2 EH |
578 | restart_flag = I2C_RS_TRANSFER; |
579 | ||
ce38815d XC |
580 | reinit_completion(&i2c->msg_complete); |
581 | ||
bc6eaf17 | 582 | control_reg = mtk_i2c_readw(i2c, OFFSET_CONTROL) & |
ce38815d | 583 | ~(I2C_CONTROL_DIR_CHANGE | I2C_CONTROL_RS); |
93caa0da | 584 | if ((i2c->speed_hz > MAX_FS_MODE_SPEED) || (left_num >= 1)) |
ce38815d XC |
585 | control_reg |= I2C_CONTROL_RS; |
586 | ||
587 | if (i2c->op == I2C_MASTER_WRRD) | |
588 | control_reg |= I2C_CONTROL_DIR_CHANGE | I2C_CONTROL_RS; | |
589 | ||
bc6eaf17 | 590 | mtk_i2c_writew(i2c, control_reg, OFFSET_CONTROL); |
ce38815d XC |
591 | |
592 | /* set start condition */ | |
93caa0da | 593 | if (i2c->speed_hz <= I2C_DEFAULT_SPEED) |
bc6eaf17 | 594 | mtk_i2c_writew(i2c, I2C_ST_START_CON, OFFSET_EXT_CONF); |
ce38815d | 595 | else |
bc6eaf17 | 596 | mtk_i2c_writew(i2c, I2C_FS_START_CON, OFFSET_EXT_CONF); |
ce38815d | 597 | |
0d47ce21 | 598 | addr_reg = i2c_8bit_addr_from_msg(msgs); |
bc6eaf17 | 599 | mtk_i2c_writew(i2c, addr_reg, OFFSET_SLAVE_ADDR); |
ce38815d XC |
600 | |
601 | /* Clear interrupt status */ | |
bc6eaf17 | 602 | mtk_i2c_writew(i2c, restart_flag | I2C_HS_NACKERR | I2C_ACKERR | |
cad6dc5d | 603 | I2C_ARB_LOST | I2C_TRANSAC_COMP, OFFSET_INTR_STAT); |
bc6eaf17 QW |
604 | |
605 | mtk_i2c_writew(i2c, I2C_FIFO_ADDR_CLR, OFFSET_FIFO_ADDR_CLR); | |
ce38815d XC |
606 | |
607 | /* Enable interrupt */ | |
bc6eaf17 | 608 | mtk_i2c_writew(i2c, restart_flag | I2C_HS_NACKERR | I2C_ACKERR | |
cad6dc5d | 609 | I2C_ARB_LOST | I2C_TRANSAC_COMP, OFFSET_INTR_MASK); |
ce38815d XC |
610 | |
611 | /* Set transfer and transaction len */ | |
612 | if (i2c->op == I2C_MASTER_WRRD) { | |
173b77e8 | 613 | if (i2c->dev_comp->aux_len_reg) { |
bc6eaf17 QW |
614 | mtk_i2c_writew(i2c, msgs->len, OFFSET_TRANSFER_LEN); |
615 | mtk_i2c_writew(i2c, (msgs + 1)->len, | |
616 | OFFSET_TRANSFER_LEN_AUX); | |
173b77e8 | 617 | } else { |
bc6eaf17 QW |
618 | mtk_i2c_writew(i2c, msgs->len | ((msgs + 1)->len) << 8, |
619 | OFFSET_TRANSFER_LEN); | |
173b77e8 | 620 | } |
bc6eaf17 | 621 | mtk_i2c_writew(i2c, I2C_WRRD_TRANAC_VALUE, OFFSET_TRANSAC_LEN); |
ce38815d | 622 | } else { |
bc6eaf17 QW |
623 | mtk_i2c_writew(i2c, msgs->len, OFFSET_TRANSFER_LEN); |
624 | mtk_i2c_writew(i2c, num, OFFSET_TRANSAC_LEN); | |
ce38815d XC |
625 | } |
626 | ||
627 | /* Prepare buffer data to start transfer */ | |
628 | if (i2c->op == I2C_MASTER_RD) { | |
629 | writel(I2C_DMA_INT_FLAG_NONE, i2c->pdmabase + OFFSET_INT_FLAG); | |
630 | writel(I2C_DMA_CON_RX, i2c->pdmabase + OFFSET_CON); | |
fc66b39f | 631 | |
bc1a7f75 | 632 | dma_rd_buf = i2c_get_dma_safe_msg_buf(msgs, 1); |
fc66b39f JG |
633 | if (!dma_rd_buf) |
634 | return -ENOMEM; | |
635 | ||
636 | rpaddr = dma_map_single(i2c->dev, dma_rd_buf, | |
ce38815d | 637 | msgs->len, DMA_FROM_DEVICE); |
fc66b39f JG |
638 | if (dma_mapping_error(i2c->dev, rpaddr)) { |
639 | i2c_put_dma_safe_msg_buf(dma_rd_buf, msgs, false); | |
640 | ||
ce38815d | 641 | return -ENOMEM; |
fc66b39f | 642 | } |
f4f4fed6 LZ |
643 | |
644 | if (i2c->dev_comp->support_33bits) { | |
645 | reg_4g_mode = mtk_i2c_set_4g_mode(rpaddr); | |
646 | writel(reg_4g_mode, i2c->pdmabase + OFFSET_RX_4G_MODE); | |
647 | } | |
648 | ||
ce38815d XC |
649 | writel((u32)rpaddr, i2c->pdmabase + OFFSET_RX_MEM_ADDR); |
650 | writel(msgs->len, i2c->pdmabase + OFFSET_RX_LEN); | |
651 | } else if (i2c->op == I2C_MASTER_WR) { | |
652 | writel(I2C_DMA_INT_FLAG_NONE, i2c->pdmabase + OFFSET_INT_FLAG); | |
653 | writel(I2C_DMA_CON_TX, i2c->pdmabase + OFFSET_CON); | |
fc66b39f | 654 | |
bc1a7f75 | 655 | dma_wr_buf = i2c_get_dma_safe_msg_buf(msgs, 1); |
fc66b39f JG |
656 | if (!dma_wr_buf) |
657 | return -ENOMEM; | |
658 | ||
659 | wpaddr = dma_map_single(i2c->dev, dma_wr_buf, | |
ce38815d | 660 | msgs->len, DMA_TO_DEVICE); |
fc66b39f JG |
661 | if (dma_mapping_error(i2c->dev, wpaddr)) { |
662 | i2c_put_dma_safe_msg_buf(dma_wr_buf, msgs, false); | |
663 | ||
ce38815d | 664 | return -ENOMEM; |
fc66b39f | 665 | } |
f4f4fed6 LZ |
666 | |
667 | if (i2c->dev_comp->support_33bits) { | |
668 | reg_4g_mode = mtk_i2c_set_4g_mode(wpaddr); | |
669 | writel(reg_4g_mode, i2c->pdmabase + OFFSET_TX_4G_MODE); | |
670 | } | |
671 | ||
ce38815d XC |
672 | writel((u32)wpaddr, i2c->pdmabase + OFFSET_TX_MEM_ADDR); |
673 | writel(msgs->len, i2c->pdmabase + OFFSET_TX_LEN); | |
674 | } else { | |
675 | writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_INT_FLAG); | |
676 | writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_CON); | |
fc66b39f | 677 | |
bc1a7f75 | 678 | dma_wr_buf = i2c_get_dma_safe_msg_buf(msgs, 1); |
fc66b39f JG |
679 | if (!dma_wr_buf) |
680 | return -ENOMEM; | |
681 | ||
682 | wpaddr = dma_map_single(i2c->dev, dma_wr_buf, | |
ce38815d | 683 | msgs->len, DMA_TO_DEVICE); |
fc66b39f JG |
684 | if (dma_mapping_error(i2c->dev, wpaddr)) { |
685 | i2c_put_dma_safe_msg_buf(dma_wr_buf, msgs, false); | |
686 | ||
ce38815d | 687 | return -ENOMEM; |
fc66b39f JG |
688 | } |
689 | ||
bc1a7f75 | 690 | dma_rd_buf = i2c_get_dma_safe_msg_buf((msgs + 1), 1); |
fc66b39f JG |
691 | if (!dma_rd_buf) { |
692 | dma_unmap_single(i2c->dev, wpaddr, | |
693 | msgs->len, DMA_TO_DEVICE); | |
694 | ||
695 | i2c_put_dma_safe_msg_buf(dma_wr_buf, msgs, false); | |
696 | ||
697 | return -ENOMEM; | |
698 | } | |
699 | ||
700 | rpaddr = dma_map_single(i2c->dev, dma_rd_buf, | |
ce38815d XC |
701 | (msgs + 1)->len, |
702 | DMA_FROM_DEVICE); | |
703 | if (dma_mapping_error(i2c->dev, rpaddr)) { | |
704 | dma_unmap_single(i2c->dev, wpaddr, | |
705 | msgs->len, DMA_TO_DEVICE); | |
fc66b39f JG |
706 | |
707 | i2c_put_dma_safe_msg_buf(dma_wr_buf, msgs, false); | |
708 | i2c_put_dma_safe_msg_buf(dma_rd_buf, (msgs + 1), false); | |
709 | ||
ce38815d XC |
710 | return -ENOMEM; |
711 | } | |
f4f4fed6 LZ |
712 | |
713 | if (i2c->dev_comp->support_33bits) { | |
714 | reg_4g_mode = mtk_i2c_set_4g_mode(wpaddr); | |
715 | writel(reg_4g_mode, i2c->pdmabase + OFFSET_TX_4G_MODE); | |
716 | ||
717 | reg_4g_mode = mtk_i2c_set_4g_mode(rpaddr); | |
718 | writel(reg_4g_mode, i2c->pdmabase + OFFSET_RX_4G_MODE); | |
719 | } | |
720 | ||
ce38815d XC |
721 | writel((u32)wpaddr, i2c->pdmabase + OFFSET_TX_MEM_ADDR); |
722 | writel((u32)rpaddr, i2c->pdmabase + OFFSET_RX_MEM_ADDR); | |
723 | writel(msgs->len, i2c->pdmabase + OFFSET_TX_LEN); | |
724 | writel((msgs + 1)->len, i2c->pdmabase + OFFSET_RX_LEN); | |
725 | } | |
726 | ||
727 | writel(I2C_DMA_START_EN, i2c->pdmabase + OFFSET_EN); | |
b2ed11e2 | 728 | |
173b77e8 | 729 | if (!i2c->auto_restart) { |
b2ed11e2 EH |
730 | start_reg = I2C_TRANSAC_START; |
731 | } else { | |
732 | start_reg = I2C_TRANSAC_START | I2C_RS_MUL_TRIG; | |
733 | if (left_num >= 1) | |
734 | start_reg |= I2C_RS_MUL_CNFG; | |
735 | } | |
bc6eaf17 | 736 | mtk_i2c_writew(i2c, start_reg, OFFSET_START); |
ce38815d XC |
737 | |
738 | ret = wait_for_completion_timeout(&i2c->msg_complete, | |
739 | i2c->adap.timeout); | |
740 | ||
741 | /* Clear interrupt mask */ | |
bc6eaf17 | 742 | mtk_i2c_writew(i2c, ~(restart_flag | I2C_HS_NACKERR | I2C_ACKERR | |
cad6dc5d | 743 | I2C_ARB_LOST | I2C_TRANSAC_COMP), OFFSET_INTR_MASK); |
ce38815d XC |
744 | |
745 | if (i2c->op == I2C_MASTER_WR) { | |
746 | dma_unmap_single(i2c->dev, wpaddr, | |
747 | msgs->len, DMA_TO_DEVICE); | |
fc66b39f JG |
748 | |
749 | i2c_put_dma_safe_msg_buf(dma_wr_buf, msgs, true); | |
ce38815d XC |
750 | } else if (i2c->op == I2C_MASTER_RD) { |
751 | dma_unmap_single(i2c->dev, rpaddr, | |
752 | msgs->len, DMA_FROM_DEVICE); | |
fc66b39f JG |
753 | |
754 | i2c_put_dma_safe_msg_buf(dma_rd_buf, msgs, true); | |
ce38815d XC |
755 | } else { |
756 | dma_unmap_single(i2c->dev, wpaddr, msgs->len, | |
757 | DMA_TO_DEVICE); | |
758 | dma_unmap_single(i2c->dev, rpaddr, (msgs + 1)->len, | |
759 | DMA_FROM_DEVICE); | |
fc66b39f JG |
760 | |
761 | i2c_put_dma_safe_msg_buf(dma_wr_buf, msgs, true); | |
762 | i2c_put_dma_safe_msg_buf(dma_rd_buf, (msgs + 1), true); | |
ce38815d XC |
763 | } |
764 | ||
765 | if (ret == 0) { | |
766 | dev_dbg(i2c->dev, "addr: %x, transfer timeout\n", msgs->addr); | |
767 | mtk_i2c_init_hw(i2c); | |
768 | return -ETIMEDOUT; | |
769 | } | |
770 | ||
ce38815d XC |
771 | if (i2c->irq_stat & (I2C_HS_NACKERR | I2C_ACKERR)) { |
772 | dev_dbg(i2c->dev, "addr: %x, transfer ACK error\n", msgs->addr); | |
773 | mtk_i2c_init_hw(i2c); | |
774 | return -ENXIO; | |
775 | } | |
776 | ||
777 | return 0; | |
778 | } | |
779 | ||
780 | static int mtk_i2c_transfer(struct i2c_adapter *adap, | |
781 | struct i2c_msg msgs[], int num) | |
782 | { | |
783 | int ret; | |
784 | int left_num = num; | |
785 | struct mtk_i2c *i2c = i2c_get_adapdata(adap); | |
786 | ||
787 | ret = mtk_i2c_clock_enable(i2c); | |
788 | if (ret) | |
789 | return ret; | |
790 | ||
173b77e8 LZ |
791 | i2c->auto_restart = i2c->dev_comp->auto_restart; |
792 | ||
793 | /* checking if we can skip restart and optimize using WRRD mode */ | |
794 | if (i2c->auto_restart && num == 2) { | |
795 | if (!(msgs[0].flags & I2C_M_RD) && (msgs[1].flags & I2C_M_RD) && | |
796 | msgs[0].addr == msgs[1].addr) { | |
797 | i2c->auto_restart = 0; | |
798 | } | |
799 | } | |
800 | ||
8378d01f LZ |
801 | if (i2c->auto_restart && num >= 2 && i2c->speed_hz > MAX_FS_MODE_SPEED) |
802 | /* ignore the first restart irq after the master code, | |
803 | * otherwise the first transfer will be discarded. | |
804 | */ | |
805 | i2c->ignore_restart_irq = true; | |
806 | else | |
807 | i2c->ignore_restart_irq = false; | |
808 | ||
b2ed11e2 EH |
809 | while (left_num--) { |
810 | if (!msgs->buf) { | |
811 | dev_dbg(i2c->dev, "data buffer is NULL.\n"); | |
812 | ret = -EINVAL; | |
813 | goto err_exit; | |
814 | } | |
ce38815d | 815 | |
b2ed11e2 EH |
816 | if (msgs->flags & I2C_M_RD) |
817 | i2c->op = I2C_MASTER_RD; | |
818 | else | |
819 | i2c->op = I2C_MASTER_WR; | |
820 | ||
173b77e8 | 821 | if (!i2c->auto_restart) { |
b2ed11e2 EH |
822 | if (num > 1) { |
823 | /* combined two messages into one transaction */ | |
824 | i2c->op = I2C_MASTER_WRRD; | |
825 | left_num--; | |
826 | } | |
827 | } | |
ce38815d | 828 | |
b2ed11e2 EH |
829 | /* always use DMA mode. */ |
830 | ret = mtk_i2c_do_transfer(i2c, msgs, num, left_num); | |
831 | if (ret < 0) | |
832 | goto err_exit; | |
ce38815d | 833 | |
b2ed11e2 EH |
834 | msgs++; |
835 | } | |
ce38815d XC |
836 | /* the return value is number of executed messages */ |
837 | ret = num; | |
838 | ||
839 | err_exit: | |
840 | mtk_i2c_clock_disable(i2c); | |
841 | return ret; | |
842 | } | |
843 | ||
844 | static irqreturn_t mtk_i2c_irq(int irqno, void *dev_id) | |
845 | { | |
846 | struct mtk_i2c *i2c = dev_id; | |
b2ed11e2 | 847 | u16 restart_flag = 0; |
28c0a843 | 848 | u16 intr_stat; |
b2ed11e2 | 849 | |
173b77e8 | 850 | if (i2c->auto_restart) |
b2ed11e2 | 851 | restart_flag = I2C_RS_TRANSFER; |
ce38815d | 852 | |
bc6eaf17 QW |
853 | intr_stat = mtk_i2c_readw(i2c, OFFSET_INTR_STAT); |
854 | mtk_i2c_writew(i2c, intr_stat, OFFSET_INTR_STAT); | |
ce38815d | 855 | |
28c0a843 EH |
856 | /* |
857 | * when occurs ack error, i2c controller generate two interrupts | |
858 | * first is the ack error interrupt, then the complete interrupt | |
859 | * i2c->irq_stat need keep the two interrupt value. | |
860 | */ | |
861 | i2c->irq_stat |= intr_stat; | |
8378d01f LZ |
862 | |
863 | if (i2c->ignore_restart_irq && (i2c->irq_stat & restart_flag)) { | |
864 | i2c->ignore_restart_irq = false; | |
865 | i2c->irq_stat = 0; | |
bc6eaf17 QW |
866 | mtk_i2c_writew(i2c, I2C_RS_MUL_CNFG | I2C_RS_MUL_TRIG | |
867 | I2C_TRANSAC_START, OFFSET_START); | |
8378d01f LZ |
868 | } else { |
869 | if (i2c->irq_stat & (I2C_TRANSAC_COMP | restart_flag)) | |
870 | complete(&i2c->msg_complete); | |
871 | } | |
ce38815d XC |
872 | |
873 | return IRQ_HANDLED; | |
874 | } | |
875 | ||
876 | static u32 mtk_i2c_functionality(struct i2c_adapter *adap) | |
877 | { | |
62931ac2 | 878 | if (i2c_check_quirks(adap, I2C_AQ_NO_ZERO_LEN)) |
abf4923e HYW |
879 | return I2C_FUNC_I2C | |
880 | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK); | |
881 | else | |
882 | return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; | |
ce38815d XC |
883 | } |
884 | ||
885 | static const struct i2c_algorithm mtk_i2c_algorithm = { | |
886 | .master_xfer = mtk_i2c_transfer, | |
887 | .functionality = mtk_i2c_functionality, | |
888 | }; | |
889 | ||
f2326401 | 890 | static int mtk_i2c_parse_dt(struct device_node *np, struct mtk_i2c *i2c) |
ce38815d XC |
891 | { |
892 | int ret; | |
893 | ||
894 | ret = of_property_read_u32(np, "clock-frequency", &i2c->speed_hz); | |
895 | if (ret < 0) | |
896 | i2c->speed_hz = I2C_DEFAULT_SPEED; | |
897 | ||
f2326401 | 898 | ret = of_property_read_u32(np, "clock-div", &i2c->clk_src_div); |
ce38815d XC |
899 | if (ret < 0) |
900 | return ret; | |
901 | ||
f2326401 | 902 | if (i2c->clk_src_div == 0) |
ce38815d XC |
903 | return -EINVAL; |
904 | ||
905 | i2c->have_pmic = of_property_read_bool(np, "mediatek,have-pmic"); | |
906 | i2c->use_push_pull = | |
907 | of_property_read_bool(np, "mediatek,use-push-pull"); | |
908 | ||
909 | return 0; | |
910 | } | |
911 | ||
912 | static int mtk_i2c_probe(struct platform_device *pdev) | |
913 | { | |
ce38815d XC |
914 | int ret = 0; |
915 | struct mtk_i2c *i2c; | |
916 | struct clk *clk; | |
ce38815d XC |
917 | struct resource *res; |
918 | int irq; | |
919 | ||
920 | i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL); | |
921 | if (!i2c) | |
922 | return -ENOMEM; | |
923 | ||
ce38815d XC |
924 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
925 | i2c->base = devm_ioremap_resource(&pdev->dev, res); | |
926 | if (IS_ERR(i2c->base)) | |
927 | return PTR_ERR(i2c->base); | |
928 | ||
929 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
930 | i2c->pdmabase = devm_ioremap_resource(&pdev->dev, res); | |
931 | if (IS_ERR(i2c->pdmabase)) | |
932 | return PTR_ERR(i2c->pdmabase); | |
933 | ||
934 | irq = platform_get_irq(pdev, 0); | |
935 | if (irq <= 0) | |
936 | return irq; | |
937 | ||
938 | init_completion(&i2c->msg_complete); | |
939 | ||
6e29577f | 940 | i2c->dev_comp = of_device_get_match_data(&pdev->dev); |
ce38815d XC |
941 | i2c->adap.dev.of_node = pdev->dev.of_node; |
942 | i2c->dev = &pdev->dev; | |
943 | i2c->adap.dev.parent = &pdev->dev; | |
944 | i2c->adap.owner = THIS_MODULE; | |
945 | i2c->adap.algo = &mtk_i2c_algorithm; | |
946 | i2c->adap.quirks = i2c->dev_comp->quirks; | |
947 | i2c->adap.timeout = 2 * HZ; | |
948 | i2c->adap.retries = 1; | |
949 | ||
5a10e7d7 JG |
950 | ret = mtk_i2c_parse_dt(pdev->dev.of_node, i2c); |
951 | if (ret) | |
952 | return -EINVAL; | |
953 | ||
954 | if (i2c->dev_comp->timing_adjust) | |
955 | i2c->clk_src_div *= I2C_DEFAULT_CLK_DIV; | |
956 | ||
ce38815d XC |
957 | if (i2c->have_pmic && !i2c->dev_comp->pmic_i2c) |
958 | return -EINVAL; | |
959 | ||
960 | i2c->clk_main = devm_clk_get(&pdev->dev, "main"); | |
961 | if (IS_ERR(i2c->clk_main)) { | |
962 | dev_err(&pdev->dev, "cannot get main clock\n"); | |
963 | return PTR_ERR(i2c->clk_main); | |
964 | } | |
965 | ||
966 | i2c->clk_dma = devm_clk_get(&pdev->dev, "dma"); | |
967 | if (IS_ERR(i2c->clk_dma)) { | |
968 | dev_err(&pdev->dev, "cannot get dma clock\n"); | |
969 | return PTR_ERR(i2c->clk_dma); | |
970 | } | |
971 | ||
cad6dc5d QW |
972 | i2c->clk_arb = devm_clk_get(&pdev->dev, "arb"); |
973 | if (IS_ERR(i2c->clk_arb)) | |
974 | i2c->clk_arb = NULL; | |
975 | ||
ce38815d XC |
976 | clk = i2c->clk_main; |
977 | if (i2c->have_pmic) { | |
978 | i2c->clk_pmic = devm_clk_get(&pdev->dev, "pmic"); | |
979 | if (IS_ERR(i2c->clk_pmic)) { | |
980 | dev_err(&pdev->dev, "cannot get pmic clock\n"); | |
981 | return PTR_ERR(i2c->clk_pmic); | |
982 | } | |
983 | clk = i2c->clk_pmic; | |
984 | } | |
985 | ||
986 | strlcpy(i2c->adap.name, I2C_DRV_NAME, sizeof(i2c->adap.name)); | |
987 | ||
f2326401 | 988 | ret = mtk_i2c_set_speed(i2c, clk_get_rate(clk)); |
ce38815d XC |
989 | if (ret) { |
990 | dev_err(&pdev->dev, "Failed to set the speed.\n"); | |
991 | return -EINVAL; | |
992 | } | |
993 | ||
f4f4fed6 LZ |
994 | if (i2c->dev_comp->support_33bits) { |
995 | ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(33)); | |
996 | if (ret) { | |
997 | dev_err(&pdev->dev, "dma_set_mask return error.\n"); | |
998 | return ret; | |
999 | } | |
1000 | } | |
1001 | ||
ce38815d XC |
1002 | ret = mtk_i2c_clock_enable(i2c); |
1003 | if (ret) { | |
1004 | dev_err(&pdev->dev, "clock enable failed!\n"); | |
1005 | return ret; | |
1006 | } | |
1007 | mtk_i2c_init_hw(i2c); | |
1008 | mtk_i2c_clock_disable(i2c); | |
1009 | ||
1010 | ret = devm_request_irq(&pdev->dev, irq, mtk_i2c_irq, | |
1011 | IRQF_TRIGGER_NONE, I2C_DRV_NAME, i2c); | |
1012 | if (ret < 0) { | |
1013 | dev_err(&pdev->dev, | |
1014 | "Request I2C IRQ %d fail\n", irq); | |
1015 | return ret; | |
1016 | } | |
1017 | ||
1018 | i2c_set_adapdata(&i2c->adap, i2c); | |
1019 | ret = i2c_add_adapter(&i2c->adap); | |
ea734404 | 1020 | if (ret) |
ce38815d | 1021 | return ret; |
ce38815d XC |
1022 | |
1023 | platform_set_drvdata(pdev, i2c); | |
1024 | ||
1025 | return 0; | |
1026 | } | |
1027 | ||
1028 | static int mtk_i2c_remove(struct platform_device *pdev) | |
1029 | { | |
1030 | struct mtk_i2c *i2c = platform_get_drvdata(pdev); | |
1031 | ||
1032 | i2c_del_adapter(&i2c->adap); | |
1033 | ||
1034 | return 0; | |
1035 | } | |
1036 | ||
09027e08 LZ |
1037 | #ifdef CONFIG_PM_SLEEP |
1038 | static int mtk_i2c_resume(struct device *dev) | |
1039 | { | |
f6762ced | 1040 | int ret; |
09027e08 LZ |
1041 | struct mtk_i2c *i2c = dev_get_drvdata(dev); |
1042 | ||
f6762ced JG |
1043 | ret = mtk_i2c_clock_enable(i2c); |
1044 | if (ret) { | |
1045 | dev_err(dev, "clock enable failed!\n"); | |
1046 | return ret; | |
1047 | } | |
1048 | ||
09027e08 LZ |
1049 | mtk_i2c_init_hw(i2c); |
1050 | ||
f6762ced JG |
1051 | mtk_i2c_clock_disable(i2c); |
1052 | ||
09027e08 LZ |
1053 | return 0; |
1054 | } | |
1055 | #endif | |
1056 | ||
1057 | static const struct dev_pm_ops mtk_i2c_pm = { | |
1058 | SET_SYSTEM_SLEEP_PM_OPS(NULL, mtk_i2c_resume) | |
1059 | }; | |
1060 | ||
ce38815d XC |
1061 | static struct platform_driver mtk_i2c_driver = { |
1062 | .probe = mtk_i2c_probe, | |
1063 | .remove = mtk_i2c_remove, | |
1064 | .driver = { | |
1065 | .name = I2C_DRV_NAME, | |
09027e08 | 1066 | .pm = &mtk_i2c_pm, |
ce38815d XC |
1067 | .of_match_table = of_match_ptr(mtk_i2c_of_match), |
1068 | }, | |
1069 | }; | |
1070 | ||
1071 | module_platform_driver(mtk_i2c_driver); | |
1072 | ||
1073 | MODULE_LICENSE("GPL v2"); | |
1074 | MODULE_DESCRIPTION("MediaTek I2C Bus Driver"); | |
1075 | MODULE_AUTHOR("Xudong Chen <xudong.chen@mediatek.com>"); |