1 /*
2 * Copyright (C) 2013 BayHub Technology Ltd.
3 *
4 * Authors: Peter Guo <peter.guo@bayhubtech.com>
5 * Adam Lee <adam.lee@canonical.com>
6 * Ernest Zhang <ernest.zhang@bayhubtech.com>
7 *
8 * This software is licensed under the terms of the GNU General Public
9 * License version 2, as published by the Free Software Foundation, and
10 * may be copied, distributed, and modified under those terms.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 */
18
19 #include <linux/pci.h>
20 #include <linux/mmc/host.h>
21 #include <linux/mmc/mmc.h>
22 #include <linux/delay.h>
23
24 #include "sdhci.h"
25 #include "sdhci-pci.h"
26
27 /*
28 * O2Micro device registers
29 */
30
31 #define O2_SD_MISC_REG5 0x64
32 #define O2_SD_LD0_CTRL 0x68
33 #define O2_SD_DEV_CTRL 0x88
34 #define O2_SD_LOCK_WP 0xD3
35 #define O2_SD_TEST_REG 0xD4
36 #define O2_SD_FUNC_REG0 0xDC
37 #define O2_SD_MULTI_VCC3V 0xEE
38 #define O2_SD_CLKREQ 0xEC
39 #define O2_SD_CAPS 0xE0
40 #define O2_SD_ADMA1 0xE2
41 #define O2_SD_ADMA2 0xE7
42 #define O2_SD_INF_MOD 0xF1
43 #define O2_SD_MISC_CTRL4 0xFC
44 #define O2_SD_TUNING_CTRL 0x300
45 #define O2_SD_PLL_SETTING 0x304
46 #define O2_SD_MISC_SETTING 0x308
47 #define O2_SD_CLK_SETTING 0x328
48 #define O2_SD_CAP_REG2 0x330
49 #define O2_SD_CAP_REG0 0x334
50 #define O2_SD_UHS1_CAP_SETTING 0x33C
51 #define O2_SD_DELAY_CTRL 0x350
52 #define O2_SD_UHS2_L1_CTRL 0x35C
53 #define O2_SD_FUNC_REG3 0x3E0
54 #define O2_SD_FUNC_REG4 0x3E4
55 #define O2_SD_LED_ENABLE BIT(6)
56 #define O2_SD_FREG0_LEDOFF BIT(13)
57 #define O2_SD_FREG4_ENABLE_CLK_SET BIT(22)
58
59 #define O2_SD_VENDOR_SETTING 0x110
60 #define O2_SD_VENDOR_SETTING2 0x1C8
61 #define O2_SD_HW_TUNING_DISABLE BIT(4)
62
sdhci_o2_set_tuning_mode(struct sdhci_host * host)63 static void sdhci_o2_set_tuning_mode(struct sdhci_host *host)
64 {
65 u16 reg;
66
67 /* enable hardware tuning */
68 reg = sdhci_readw(host, O2_SD_VENDOR_SETTING);
69 reg &= ~O2_SD_HW_TUNING_DISABLE;
70 sdhci_writew(host, reg, O2_SD_VENDOR_SETTING);
71 }
72
__sdhci_o2_execute_tuning(struct sdhci_host * host,u32 opcode)73 static void __sdhci_o2_execute_tuning(struct sdhci_host *host, u32 opcode)
74 {
75 int i;
76
77 sdhci_send_tuning(host, MMC_SEND_TUNING_BLOCK_HS200);
78
79 for (i = 0; i < 150; i++) {
80 u16 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
81
82 if (!(ctrl & SDHCI_CTRL_EXEC_TUNING)) {
83 if (ctrl & SDHCI_CTRL_TUNED_CLK) {
84 host->tuning_done = true;
85 return;
86 }
87 pr_warn("%s: HW tuning failed !\n",
88 mmc_hostname(host->mmc));
89 break;
90 }
91
92 mdelay(1);
93 }
94
95 pr_info("%s: Tuning failed, falling back to fixed sampling clock\n",
96 mmc_hostname(host->mmc));
97 sdhci_reset_tuning(host);
98 }
99
sdhci_o2_execute_tuning(struct mmc_host * mmc,u32 opcode)100 static int sdhci_o2_execute_tuning(struct mmc_host *mmc, u32 opcode)
101 {
102 struct sdhci_host *host = mmc_priv(mmc);
103 int current_bus_width = 0;
104
105 /*
106 * This handler only implements the eMMC tuning that is specific to
107 * this controller. Fall back to the standard method for other TIMING.
108 */
109 if (host->timing != MMC_TIMING_MMC_HS200)
110 return sdhci_execute_tuning(mmc, opcode);
111
112 if (WARN_ON(opcode != MMC_SEND_TUNING_BLOCK_HS200))
113 return -EINVAL;
114
115 /*
116 * o2 sdhci host didn't support 8bit emmc tuning
117 */
118 if (mmc->ios.bus_width == MMC_BUS_WIDTH_8) {
119 current_bus_width = mmc->ios.bus_width;
120 mmc->ios.bus_width = MMC_BUS_WIDTH_4;
121 sdhci_set_bus_width(host, MMC_BUS_WIDTH_4);
122 }
123
124 sdhci_o2_set_tuning_mode(host);
125
126 sdhci_start_tuning(host);
127
128 __sdhci_o2_execute_tuning(host, opcode);
129
130 sdhci_end_tuning(host);
131
132 if (current_bus_width == MMC_BUS_WIDTH_8) {
133 mmc->ios.bus_width = MMC_BUS_WIDTH_8;
134 sdhci_set_bus_width(host, current_bus_width);
135 }
136
137 host->flags &= ~SDHCI_HS400_TUNING;
138 return 0;
139 }
140
o2_pci_set_baseclk(struct sdhci_pci_chip * chip,u32 value)141 static void o2_pci_set_baseclk(struct sdhci_pci_chip *chip, u32 value)
142 {
143 u32 scratch_32;
144 pci_read_config_dword(chip->pdev,
145 O2_SD_PLL_SETTING, &scratch_32);
146
147 scratch_32 &= 0x0000FFFF;
148 scratch_32 |= value;
149
150 pci_write_config_dword(chip->pdev,
151 O2_SD_PLL_SETTING, scratch_32);
152 }
153
o2_pci_led_enable(struct sdhci_pci_chip * chip)154 static void o2_pci_led_enable(struct sdhci_pci_chip *chip)
155 {
156 int ret;
157 u32 scratch_32;
158
159 /* Set led of SD host function enable */
160 ret = pci_read_config_dword(chip->pdev,
161 O2_SD_FUNC_REG0, &scratch_32);
162 if (ret)
163 return;
164
165 scratch_32 &= ~O2_SD_FREG0_LEDOFF;
166 pci_write_config_dword(chip->pdev,
167 O2_SD_FUNC_REG0, scratch_32);
168
169 ret = pci_read_config_dword(chip->pdev,
170 O2_SD_TEST_REG, &scratch_32);
171 if (ret)
172 return;
173
174 scratch_32 |= O2_SD_LED_ENABLE;
175 pci_write_config_dword(chip->pdev,
176 O2_SD_TEST_REG, scratch_32);
177
178 }
179
sdhci_pci_o2_fujin2_pci_init(struct sdhci_pci_chip * chip)180 static void sdhci_pci_o2_fujin2_pci_init(struct sdhci_pci_chip *chip)
181 {
182 u32 scratch_32;
183 int ret;
184 /* Improve write performance for SD3.0 */
185 ret = pci_read_config_dword(chip->pdev, O2_SD_DEV_CTRL, &scratch_32);
186 if (ret)
187 return;
188 scratch_32 &= ~((1 << 12) | (1 << 13) | (1 << 14));
189 pci_write_config_dword(chip->pdev, O2_SD_DEV_CTRL, scratch_32);
190
191 /* Enable Link abnormal reset generating Reset */
192 ret = pci_read_config_dword(chip->pdev, O2_SD_MISC_REG5, &scratch_32);
193 if (ret)
194 return;
195 scratch_32 &= ~((1 << 19) | (1 << 11));
196 scratch_32 |= (1 << 10);
197 pci_write_config_dword(chip->pdev, O2_SD_MISC_REG5, scratch_32);
198
199 /* set card power over current protection */
200 ret = pci_read_config_dword(chip->pdev, O2_SD_TEST_REG, &scratch_32);
201 if (ret)
202 return;
203 scratch_32 |= (1 << 4);
204 pci_write_config_dword(chip->pdev, O2_SD_TEST_REG, scratch_32);
205
206 /* adjust the output delay for SD mode */
207 pci_write_config_dword(chip->pdev, O2_SD_DELAY_CTRL, 0x00002492);
208
209 /* Set the output voltage setting of Aux 1.2v LDO */
210 ret = pci_read_config_dword(chip->pdev, O2_SD_LD0_CTRL, &scratch_32);
211 if (ret)
212 return;
213 scratch_32 &= ~(3 << 12);
214 pci_write_config_dword(chip->pdev, O2_SD_LD0_CTRL, scratch_32);
215
216 /* Set Max power supply capability of SD host */
217 ret = pci_read_config_dword(chip->pdev, O2_SD_CAP_REG0, &scratch_32);
218 if (ret)
219 return;
220 scratch_32 &= ~(0x01FE);
221 scratch_32 |= 0x00CC;
222 pci_write_config_dword(chip->pdev, O2_SD_CAP_REG0, scratch_32);
223 /* Set DLL Tuning Window */
224 ret = pci_read_config_dword(chip->pdev,
225 O2_SD_TUNING_CTRL, &scratch_32);
226 if (ret)
227 return;
228 scratch_32 &= ~(0x000000FF);
229 scratch_32 |= 0x00000066;
230 pci_write_config_dword(chip->pdev, O2_SD_TUNING_CTRL, scratch_32);
231
232 /* Set UHS2 T_EIDLE */
233 ret = pci_read_config_dword(chip->pdev,
234 O2_SD_UHS2_L1_CTRL, &scratch_32);
235 if (ret)
236 return;
237 scratch_32 &= ~(0x000000FC);
238 scratch_32 |= 0x00000084;
239 pci_write_config_dword(chip->pdev, O2_SD_UHS2_L1_CTRL, scratch_32);
240
241 /* Set UHS2 Termination */
242 ret = pci_read_config_dword(chip->pdev, O2_SD_FUNC_REG3, &scratch_32);
243 if (ret)
244 return;
245 scratch_32 &= ~((1 << 21) | (1 << 30));
246
247 pci_write_config_dword(chip->pdev, O2_SD_FUNC_REG3, scratch_32);
248
249 /* Set L1 Entrance Timer */
250 ret = pci_read_config_dword(chip->pdev, O2_SD_CAPS, &scratch_32);
251 if (ret)
252 return;
253 scratch_32 &= ~(0xf0000000);
254 scratch_32 |= 0x30000000;
255 pci_write_config_dword(chip->pdev, O2_SD_CAPS, scratch_32);
256
257 ret = pci_read_config_dword(chip->pdev,
258 O2_SD_MISC_CTRL4, &scratch_32);
259 if (ret)
260 return;
261 scratch_32 &= ~(0x000f0000);
262 scratch_32 |= 0x00080000;
263 pci_write_config_dword(chip->pdev, O2_SD_MISC_CTRL4, scratch_32);
264 }
265
sdhci_pci_o2_enable_msi(struct sdhci_pci_chip * chip,struct sdhci_host * host)266 static void sdhci_pci_o2_enable_msi(struct sdhci_pci_chip *chip,
267 struct sdhci_host *host)
268 {
269 int ret;
270
271 ret = pci_find_capability(chip->pdev, PCI_CAP_ID_MSI);
272 if (!ret) {
273 pr_info("%s: unsupport msi, use INTx irq\n",
274 mmc_hostname(host->mmc));
275 return;
276 }
277
278 ret = pci_alloc_irq_vectors(chip->pdev, 1, 1,
279 PCI_IRQ_MSI | PCI_IRQ_MSIX);
280 if (ret < 0) {
281 pr_err("%s: enable PCI MSI failed, err=%d\n",
282 mmc_hostname(host->mmc), ret);
283 return;
284 }
285
286 host->irq = pci_irq_vector(chip->pdev, 0);
287 }
288
sdhci_pci_o2_probe_slot(struct sdhci_pci_slot * slot)289 int sdhci_pci_o2_probe_slot(struct sdhci_pci_slot *slot)
290 {
291 struct sdhci_pci_chip *chip;
292 struct sdhci_host *host;
293 u32 reg, caps;
294 int ret;
295
296 chip = slot->chip;
297 host = slot->host;
298
299 caps = sdhci_readl(host, SDHCI_CAPABILITIES);
300
301 /*
302 * mmc_select_bus_width() will test the bus to determine the actual bus
303 * width.
304 */
305 if (caps & SDHCI_CAN_DO_8BIT)
306 host->mmc->caps |= MMC_CAP_8_BIT_DATA;
307
308 switch (chip->pdev->device) {
309 case PCI_DEVICE_ID_O2_SDS0:
310 case PCI_DEVICE_ID_O2_SEABIRD0:
311 case PCI_DEVICE_ID_O2_SEABIRD1:
312 case PCI_DEVICE_ID_O2_SDS1:
313 case PCI_DEVICE_ID_O2_FUJIN2:
314 reg = sdhci_readl(host, O2_SD_VENDOR_SETTING);
315 if (reg & 0x1)
316 host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
317
318 sdhci_pci_o2_enable_msi(chip, host);
319
320 if (chip->pdev->device == PCI_DEVICE_ID_O2_SEABIRD0) {
321 ret = pci_read_config_dword(chip->pdev,
322 O2_SD_MISC_SETTING, ®);
323 if (ret)
324 return -EIO;
325 if (reg & (1 << 4)) {
326 pr_info("%s: emmc 1.8v flag is set, force 1.8v signaling voltage\n",
327 mmc_hostname(host->mmc));
328 host->flags &= ~SDHCI_SIGNALING_330;
329 host->flags |= SDHCI_SIGNALING_180;
330 host->mmc->caps2 |= MMC_CAP2_NO_SD;
331 host->mmc->caps2 |= MMC_CAP2_NO_SDIO;
332 }
333 }
334
335 host->mmc_host_ops.execute_tuning = sdhci_o2_execute_tuning;
336
337 if (chip->pdev->device != PCI_DEVICE_ID_O2_FUJIN2)
338 break;
339 /* set dll watch dog timer */
340 reg = sdhci_readl(host, O2_SD_VENDOR_SETTING2);
341 reg |= (1 << 12);
342 sdhci_writel(host, reg, O2_SD_VENDOR_SETTING2);
343
344 break;
345 default:
346 break;
347 }
348
349 return 0;
350 }
351
sdhci_pci_o2_probe(struct sdhci_pci_chip * chip)352 int sdhci_pci_o2_probe(struct sdhci_pci_chip *chip)
353 {
354 int ret;
355 u8 scratch;
356 u32 scratch_32;
357
358 switch (chip->pdev->device) {
359 case PCI_DEVICE_ID_O2_8220:
360 case PCI_DEVICE_ID_O2_8221:
361 case PCI_DEVICE_ID_O2_8320:
362 case PCI_DEVICE_ID_O2_8321:
363 /* This extra setup is required due to broken ADMA. */
364 ret = pci_read_config_byte(chip->pdev,
365 O2_SD_LOCK_WP, &scratch);
366 if (ret)
367 return ret;
368 scratch &= 0x7f;
369 pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch);
370
371 /* Set Multi 3 to VCC3V# */
372 pci_write_config_byte(chip->pdev, O2_SD_MULTI_VCC3V, 0x08);
373
374 /* Disable CLK_REQ# support after media DET */
375 ret = pci_read_config_byte(chip->pdev,
376 O2_SD_CLKREQ, &scratch);
377 if (ret)
378 return ret;
379 scratch |= 0x20;
380 pci_write_config_byte(chip->pdev, O2_SD_CLKREQ, scratch);
381
382 /* Choose capabilities, enable SDMA. We have to write 0x01
383 * to the capabilities register first to unlock it.
384 */
385 ret = pci_read_config_byte(chip->pdev, O2_SD_CAPS, &scratch);
386 if (ret)
387 return ret;
388 scratch |= 0x01;
389 pci_write_config_byte(chip->pdev, O2_SD_CAPS, scratch);
390 pci_write_config_byte(chip->pdev, O2_SD_CAPS, 0x73);
391
392 /* Disable ADMA1/2 */
393 pci_write_config_byte(chip->pdev, O2_SD_ADMA1, 0x39);
394 pci_write_config_byte(chip->pdev, O2_SD_ADMA2, 0x08);
395
396 /* Disable the infinite transfer mode */
397 ret = pci_read_config_byte(chip->pdev,
398 O2_SD_INF_MOD, &scratch);
399 if (ret)
400 return ret;
401 scratch |= 0x08;
402 pci_write_config_byte(chip->pdev, O2_SD_INF_MOD, scratch);
403
404 /* Lock WP */
405 ret = pci_read_config_byte(chip->pdev,
406 O2_SD_LOCK_WP, &scratch);
407 if (ret)
408 return ret;
409 scratch |= 0x80;
410 pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch);
411 break;
412 case PCI_DEVICE_ID_O2_SDS0:
413 case PCI_DEVICE_ID_O2_SDS1:
414 case PCI_DEVICE_ID_O2_FUJIN2:
415 /* UnLock WP */
416 ret = pci_read_config_byte(chip->pdev,
417 O2_SD_LOCK_WP, &scratch);
418 if (ret)
419 return ret;
420
421 scratch &= 0x7f;
422 pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch);
423
424 /* DevId=8520 subId= 0x11 or 0x12 Type Chip support */
425 if (chip->pdev->device == PCI_DEVICE_ID_O2_FUJIN2) {
426 ret = pci_read_config_dword(chip->pdev,
427 O2_SD_FUNC_REG0,
428 &scratch_32);
429 scratch_32 = ((scratch_32 & 0xFF000000) >> 24);
430
431 /* Check Whether subId is 0x11 or 0x12 */
432 if ((scratch_32 == 0x11) || (scratch_32 == 0x12)) {
433 scratch_32 = 0x25100000;
434
435 o2_pci_set_baseclk(chip, scratch_32);
436 ret = pci_read_config_dword(chip->pdev,
437 O2_SD_FUNC_REG4,
438 &scratch_32);
439
440 /* Enable Base Clk setting change */
441 scratch_32 |= O2_SD_FREG4_ENABLE_CLK_SET;
442 pci_write_config_dword(chip->pdev,
443 O2_SD_FUNC_REG4,
444 scratch_32);
445
446 /* Set Tuning Window to 4 */
447 pci_write_config_byte(chip->pdev,
448 O2_SD_TUNING_CTRL, 0x44);
449
450 break;
451 }
452 }
453
454 /* Enable 8520 led function */
455 o2_pci_led_enable(chip);
456
457 /* Set timeout CLK */
458 ret = pci_read_config_dword(chip->pdev,
459 O2_SD_CLK_SETTING, &scratch_32);
460 if (ret)
461 return ret;
462
463 scratch_32 &= ~(0xFF00);
464 scratch_32 |= 0x07E0C800;
465 pci_write_config_dword(chip->pdev,
466 O2_SD_CLK_SETTING, scratch_32);
467
468 ret = pci_read_config_dword(chip->pdev,
469 O2_SD_CLKREQ, &scratch_32);
470 if (ret)
471 return ret;
472 scratch_32 |= 0x3;
473 pci_write_config_dword(chip->pdev, O2_SD_CLKREQ, scratch_32);
474
475 ret = pci_read_config_dword(chip->pdev,
476 O2_SD_PLL_SETTING, &scratch_32);
477 if (ret)
478 return ret;
479
480 scratch_32 &= ~(0x1F3F070E);
481 scratch_32 |= 0x18270106;
482 pci_write_config_dword(chip->pdev,
483 O2_SD_PLL_SETTING, scratch_32);
484
485 /* Disable UHS1 funciton */
486 ret = pci_read_config_dword(chip->pdev,
487 O2_SD_CAP_REG2, &scratch_32);
488 if (ret)
489 return ret;
490 scratch_32 &= ~(0xE0);
491 pci_write_config_dword(chip->pdev,
492 O2_SD_CAP_REG2, scratch_32);
493
494 if (chip->pdev->device == PCI_DEVICE_ID_O2_FUJIN2)
495 sdhci_pci_o2_fujin2_pci_init(chip);
496
497 /* Lock WP */
498 ret = pci_read_config_byte(chip->pdev,
499 O2_SD_LOCK_WP, &scratch);
500 if (ret)
501 return ret;
502 scratch |= 0x80;
503 pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch);
504 break;
505 case PCI_DEVICE_ID_O2_SEABIRD0:
506 if (chip->pdev->revision == 0x01)
507 chip->quirks |= SDHCI_QUIRK_DELAY_AFTER_POWER;
508 /* fall through */
509 case PCI_DEVICE_ID_O2_SEABIRD1:
510 /* UnLock WP */
511 ret = pci_read_config_byte(chip->pdev,
512 O2_SD_LOCK_WP, &scratch);
513 if (ret)
514 return ret;
515
516 scratch &= 0x7f;
517 pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch);
518
519 ret = pci_read_config_dword(chip->pdev,
520 O2_SD_PLL_SETTING, &scratch_32);
521
522 if ((scratch_32 & 0xff000000) == 0x01000000) {
523 scratch_32 &= 0x0000FFFF;
524 scratch_32 |= 0x1F340000;
525
526 pci_write_config_dword(chip->pdev,
527 O2_SD_PLL_SETTING, scratch_32);
528 } else {
529 scratch_32 &= 0x0000FFFF;
530 scratch_32 |= 0x25100000;
531
532 pci_write_config_dword(chip->pdev,
533 O2_SD_PLL_SETTING, scratch_32);
534
535 ret = pci_read_config_dword(chip->pdev,
536 O2_SD_FUNC_REG4,
537 &scratch_32);
538 scratch_32 |= (1 << 22);
539 pci_write_config_dword(chip->pdev,
540 O2_SD_FUNC_REG4, scratch_32);
541 }
542
543 /* Set Tuning Windows to 5 */
544 pci_write_config_byte(chip->pdev,
545 O2_SD_TUNING_CTRL, 0x55);
546 /* Lock WP */
547 ret = pci_read_config_byte(chip->pdev,
548 O2_SD_LOCK_WP, &scratch);
549 if (ret)
550 return ret;
551 scratch |= 0x80;
552 pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch);
553 break;
554 }
555
556 return 0;
557 }
558
559 #ifdef CONFIG_PM_SLEEP
sdhci_pci_o2_resume(struct sdhci_pci_chip * chip)560 int sdhci_pci_o2_resume(struct sdhci_pci_chip *chip)
561 {
562 sdhci_pci_o2_probe(chip);
563 return sdhci_pci_resume_host(chip);
564 }
565 #endif
566