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18#include <linux/clk-provider.h>
19#include <linux/clk.h>
20#include <linux/clkdev.h>
21#include <linux/debugfs.h>
22#include <linux/delay.h>
23#include <linux/of_address.h>
24#include <linux/of_platform.h>
25#include <linux/platform_device.h>
26#include <linux/sort.h>
27#include <linux/string.h>
28
29#include <soc/tegra/emc.h>
30#include <soc/tegra/fuse.h>
31#include <soc/tegra/mc.h>
32
33#define EMC_FBIO_CFG5 0x104
34#define EMC_FBIO_CFG5_DRAM_TYPE_MASK 0x3
35#define EMC_FBIO_CFG5_DRAM_TYPE_SHIFT 0
36
37#define EMC_INTSTATUS 0x0
38#define EMC_INTSTATUS_CLKCHANGE_COMPLETE BIT(4)
39
40#define EMC_CFG 0xc
41#define EMC_CFG_DRAM_CLKSTOP_PD BIT(31)
42#define EMC_CFG_DRAM_CLKSTOP_SR BIT(30)
43#define EMC_CFG_DRAM_ACPD BIT(29)
44#define EMC_CFG_DYN_SREF BIT(28)
45#define EMC_CFG_PWR_MASK ((0xF << 28) | BIT(18))
46#define EMC_CFG_DSR_VTTGEN_DRV_EN BIT(18)
47
48#define EMC_REFCTRL 0x20
49#define EMC_REFCTRL_DEV_SEL_SHIFT 0
50#define EMC_REFCTRL_ENABLE BIT(31)
51
52#define EMC_TIMING_CONTROL 0x28
53#define EMC_RC 0x2c
54#define EMC_RFC 0x30
55#define EMC_RAS 0x34
56#define EMC_RP 0x38
57#define EMC_R2W 0x3c
58#define EMC_W2R 0x40
59#define EMC_R2P 0x44
60#define EMC_W2P 0x48
61#define EMC_RD_RCD 0x4c
62#define EMC_WR_RCD 0x50
63#define EMC_RRD 0x54
64#define EMC_REXT 0x58
65#define EMC_WDV 0x5c
66#define EMC_QUSE 0x60
67#define EMC_QRST 0x64
68#define EMC_QSAFE 0x68
69#define EMC_RDV 0x6c
70#define EMC_REFRESH 0x70
71#define EMC_BURST_REFRESH_NUM 0x74
72#define EMC_PDEX2WR 0x78
73#define EMC_PDEX2RD 0x7c
74#define EMC_PCHG2PDEN 0x80
75#define EMC_ACT2PDEN 0x84
76#define EMC_AR2PDEN 0x88
77#define EMC_RW2PDEN 0x8c
78#define EMC_TXSR 0x90
79#define EMC_TCKE 0x94
80#define EMC_TFAW 0x98
81#define EMC_TRPAB 0x9c
82#define EMC_TCLKSTABLE 0xa0
83#define EMC_TCLKSTOP 0xa4
84#define EMC_TREFBW 0xa8
85#define EMC_ODT_WRITE 0xb0
86#define EMC_ODT_READ 0xb4
87#define EMC_WEXT 0xb8
88#define EMC_CTT 0xbc
89#define EMC_RFC_SLR 0xc0
90#define EMC_MRS_WAIT_CNT2 0xc4
91
92#define EMC_MRS_WAIT_CNT 0xc8
93#define EMC_MRS_WAIT_CNT_SHORT_WAIT_SHIFT 0
94#define EMC_MRS_WAIT_CNT_SHORT_WAIT_MASK \
95 (0x3FF << EMC_MRS_WAIT_CNT_SHORT_WAIT_SHIFT)
96#define EMC_MRS_WAIT_CNT_LONG_WAIT_SHIFT 16
97#define EMC_MRS_WAIT_CNT_LONG_WAIT_MASK \
98 (0x3FF << EMC_MRS_WAIT_CNT_LONG_WAIT_SHIFT)
99
100#define EMC_MRS 0xcc
101#define EMC_MODE_SET_DLL_RESET BIT(8)
102#define EMC_MODE_SET_LONG_CNT BIT(26)
103#define EMC_EMRS 0xd0
104#define EMC_REF 0xd4
105#define EMC_PRE 0xd8
106
107#define EMC_SELF_REF 0xe0
108#define EMC_SELF_REF_CMD_ENABLED BIT(0)
109#define EMC_SELF_REF_DEV_SEL_SHIFT 30
110
111#define EMC_MRW 0xe8
112
113#define EMC_MRR 0xec
114#define EMC_MRR_MA_SHIFT 16
115#define LPDDR2_MR4_TEMP_SHIFT 0
116
117#define EMC_XM2DQSPADCTRL3 0xf8
118#define EMC_FBIO_SPARE 0x100
119
120#define EMC_FBIO_CFG6 0x114
121#define EMC_EMRS2 0x12c
122#define EMC_MRW2 0x134
123#define EMC_MRW4 0x13c
124#define EMC_EINPUT 0x14c
125#define EMC_EINPUT_DURATION 0x150
126#define EMC_PUTERM_EXTRA 0x154
127#define EMC_TCKESR 0x158
128#define EMC_TPD 0x15c
129
130#define EMC_AUTO_CAL_CONFIG 0x2a4
131#define EMC_AUTO_CAL_CONFIG_AUTO_CAL_START BIT(31)
132#define EMC_AUTO_CAL_INTERVAL 0x2a8
133#define EMC_AUTO_CAL_STATUS 0x2ac
134#define EMC_AUTO_CAL_STATUS_ACTIVE BIT(31)
135#define EMC_STATUS 0x2b4
136#define EMC_STATUS_TIMING_UPDATE_STALLED BIT(23)
137
138#define EMC_CFG_2 0x2b8
139#define EMC_CFG_2_MODE_SHIFT 0
140#define EMC_CFG_2_DIS_STP_OB_CLK_DURING_NON_WR BIT(6)
141
142#define EMC_CFG_DIG_DLL 0x2bc
143#define EMC_CFG_DIG_DLL_PERIOD 0x2c0
144#define EMC_RDV_MASK 0x2cc
145#define EMC_WDV_MASK 0x2d0
146#define EMC_CTT_DURATION 0x2d8
147#define EMC_CTT_TERM_CTRL 0x2dc
148#define EMC_ZCAL_INTERVAL 0x2e0
149#define EMC_ZCAL_WAIT_CNT 0x2e4
150
151#define EMC_ZQ_CAL 0x2ec
152#define EMC_ZQ_CAL_CMD BIT(0)
153#define EMC_ZQ_CAL_LONG BIT(4)
154#define EMC_ZQ_CAL_LONG_CMD_DEV0 \
155 (DRAM_DEV_SEL_0 | EMC_ZQ_CAL_LONG | EMC_ZQ_CAL_CMD)
156#define EMC_ZQ_CAL_LONG_CMD_DEV1 \
157 (DRAM_DEV_SEL_1 | EMC_ZQ_CAL_LONG | EMC_ZQ_CAL_CMD)
158
159#define EMC_XM2CMDPADCTRL 0x2f0
160#define EMC_XM2DQSPADCTRL 0x2f8
161#define EMC_XM2DQSPADCTRL2 0x2fc
162#define EMC_XM2DQSPADCTRL2_RX_FT_REC_ENABLE BIT(0)
163#define EMC_XM2DQSPADCTRL2_VREF_ENABLE BIT(5)
164#define EMC_XM2DQPADCTRL 0x300
165#define EMC_XM2DQPADCTRL2 0x304
166#define EMC_XM2CLKPADCTRL 0x308
167#define EMC_XM2COMPPADCTRL 0x30c
168#define EMC_XM2VTTGENPADCTRL 0x310
169#define EMC_XM2VTTGENPADCTRL2 0x314
170#define EMC_XM2VTTGENPADCTRL3 0x318
171#define EMC_XM2DQSPADCTRL4 0x320
172#define EMC_DLL_XFORM_DQS0 0x328
173#define EMC_DLL_XFORM_DQS1 0x32c
174#define EMC_DLL_XFORM_DQS2 0x330
175#define EMC_DLL_XFORM_DQS3 0x334
176#define EMC_DLL_XFORM_DQS4 0x338
177#define EMC_DLL_XFORM_DQS5 0x33c
178#define EMC_DLL_XFORM_DQS6 0x340
179#define EMC_DLL_XFORM_DQS7 0x344
180#define EMC_DLL_XFORM_QUSE0 0x348
181#define EMC_DLL_XFORM_QUSE1 0x34c
182#define EMC_DLL_XFORM_QUSE2 0x350
183#define EMC_DLL_XFORM_QUSE3 0x354
184#define EMC_DLL_XFORM_QUSE4 0x358
185#define EMC_DLL_XFORM_QUSE5 0x35c
186#define EMC_DLL_XFORM_QUSE6 0x360
187#define EMC_DLL_XFORM_QUSE7 0x364
188#define EMC_DLL_XFORM_DQ0 0x368
189#define EMC_DLL_XFORM_DQ1 0x36c
190#define EMC_DLL_XFORM_DQ2 0x370
191#define EMC_DLL_XFORM_DQ3 0x374
192#define EMC_DLI_TRIM_TXDQS0 0x3a8
193#define EMC_DLI_TRIM_TXDQS1 0x3ac
194#define EMC_DLI_TRIM_TXDQS2 0x3b0
195#define EMC_DLI_TRIM_TXDQS3 0x3b4
196#define EMC_DLI_TRIM_TXDQS4 0x3b8
197#define EMC_DLI_TRIM_TXDQS5 0x3bc
198#define EMC_DLI_TRIM_TXDQS6 0x3c0
199#define EMC_DLI_TRIM_TXDQS7 0x3c4
200#define EMC_STALL_THEN_EXE_AFTER_CLKCHANGE 0x3cc
201#define EMC_SEL_DPD_CTRL 0x3d8
202#define EMC_SEL_DPD_CTRL_DATA_SEL_DPD BIT(8)
203#define EMC_SEL_DPD_CTRL_ODT_SEL_DPD BIT(5)
204#define EMC_SEL_DPD_CTRL_RESET_SEL_DPD BIT(4)
205#define EMC_SEL_DPD_CTRL_CA_SEL_DPD BIT(3)
206#define EMC_SEL_DPD_CTRL_CLK_SEL_DPD BIT(2)
207#define EMC_SEL_DPD_CTRL_DDR3_MASK \
208 ((0xf << 2) | BIT(8))
209#define EMC_SEL_DPD_CTRL_MASK \
210 ((0x3 << 2) | BIT(5) | BIT(8))
211#define EMC_PRE_REFRESH_REQ_CNT 0x3dc
212#define EMC_DYN_SELF_REF_CONTROL 0x3e0
213#define EMC_TXSRDLL 0x3e4
214#define EMC_CCFIFO_ADDR 0x3e8
215#define EMC_CCFIFO_DATA 0x3ec
216#define EMC_CCFIFO_STATUS 0x3f0
217#define EMC_CDB_CNTL_1 0x3f4
218#define EMC_CDB_CNTL_2 0x3f8
219#define EMC_XM2CLKPADCTRL2 0x3fc
220#define EMC_AUTO_CAL_CONFIG2 0x458
221#define EMC_AUTO_CAL_CONFIG3 0x45c
222#define EMC_IBDLY 0x468
223#define EMC_DLL_XFORM_ADDR0 0x46c
224#define EMC_DLL_XFORM_ADDR1 0x470
225#define EMC_DLL_XFORM_ADDR2 0x474
226#define EMC_DSR_VTTGEN_DRV 0x47c
227#define EMC_TXDSRVTTGEN 0x480
228#define EMC_XM2CMDPADCTRL4 0x484
229#define EMC_XM2CMDPADCTRL5 0x488
230#define EMC_DLL_XFORM_DQS8 0x4a0
231#define EMC_DLL_XFORM_DQS9 0x4a4
232#define EMC_DLL_XFORM_DQS10 0x4a8
233#define EMC_DLL_XFORM_DQS11 0x4ac
234#define EMC_DLL_XFORM_DQS12 0x4b0
235#define EMC_DLL_XFORM_DQS13 0x4b4
236#define EMC_DLL_XFORM_DQS14 0x4b8
237#define EMC_DLL_XFORM_DQS15 0x4bc
238#define EMC_DLL_XFORM_QUSE8 0x4c0
239#define EMC_DLL_XFORM_QUSE9 0x4c4
240#define EMC_DLL_XFORM_QUSE10 0x4c8
241#define EMC_DLL_XFORM_QUSE11 0x4cc
242#define EMC_DLL_XFORM_QUSE12 0x4d0
243#define EMC_DLL_XFORM_QUSE13 0x4d4
244#define EMC_DLL_XFORM_QUSE14 0x4d8
245#define EMC_DLL_XFORM_QUSE15 0x4dc
246#define EMC_DLL_XFORM_DQ4 0x4e0
247#define EMC_DLL_XFORM_DQ5 0x4e4
248#define EMC_DLL_XFORM_DQ6 0x4e8
249#define EMC_DLL_XFORM_DQ7 0x4ec
250#define EMC_DLI_TRIM_TXDQS8 0x520
251#define EMC_DLI_TRIM_TXDQS9 0x524
252#define EMC_DLI_TRIM_TXDQS10 0x528
253#define EMC_DLI_TRIM_TXDQS11 0x52c
254#define EMC_DLI_TRIM_TXDQS12 0x530
255#define EMC_DLI_TRIM_TXDQS13 0x534
256#define EMC_DLI_TRIM_TXDQS14 0x538
257#define EMC_DLI_TRIM_TXDQS15 0x53c
258#define EMC_CDB_CNTL_3 0x540
259#define EMC_XM2DQSPADCTRL5 0x544
260#define EMC_XM2DQSPADCTRL6 0x548
261#define EMC_XM2DQPADCTRL3 0x54c
262#define EMC_DLL_XFORM_ADDR3 0x550
263#define EMC_DLL_XFORM_ADDR4 0x554
264#define EMC_DLL_XFORM_ADDR5 0x558
265#define EMC_CFG_PIPE 0x560
266#define EMC_QPOP 0x564
267#define EMC_QUSE_WIDTH 0x568
268#define EMC_PUTERM_WIDTH 0x56c
269#define EMC_BGBIAS_CTL0 0x570
270#define EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_RX BIT(3)
271#define EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_VTTGEN BIT(2)
272#define EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD BIT(1)
273#define EMC_PUTERM_ADJ 0x574
274
275#define DRAM_DEV_SEL_ALL 0
276#define DRAM_DEV_SEL_0 (2 << 30)
277#define DRAM_DEV_SEL_1 (1 << 30)
278
279#define EMC_CFG_POWER_FEATURES_MASK \
280 (EMC_CFG_DYN_SREF | EMC_CFG_DRAM_ACPD | EMC_CFG_DRAM_CLKSTOP_SR | \
281 EMC_CFG_DRAM_CLKSTOP_PD | EMC_CFG_DSR_VTTGEN_DRV_EN)
282#define EMC_REFCTRL_DEV_SEL(n) (((n > 1) ? 0 : 2) << EMC_REFCTRL_DEV_SEL_SHIFT)
283#define EMC_DRAM_DEV_SEL(n) ((n > 1) ? DRAM_DEV_SEL_ALL : DRAM_DEV_SEL_0)
284
285
286#define EMC_STATUS_UPDATE_TIMEOUT 1000
287
288enum emc_dram_type {
289 DRAM_TYPE_DDR3 = 0,
290 DRAM_TYPE_DDR1 = 1,
291 DRAM_TYPE_LPDDR3 = 2,
292 DRAM_TYPE_DDR2 = 3
293};
294
295enum emc_dll_change {
296 DLL_CHANGE_NONE,
297 DLL_CHANGE_ON,
298 DLL_CHANGE_OFF
299};
300
301static const unsigned long emc_burst_regs[] = {
302 EMC_RC,
303 EMC_RFC,
304 EMC_RFC_SLR,
305 EMC_RAS,
306 EMC_RP,
307 EMC_R2W,
308 EMC_W2R,
309 EMC_R2P,
310 EMC_W2P,
311 EMC_RD_RCD,
312 EMC_WR_RCD,
313 EMC_RRD,
314 EMC_REXT,
315 EMC_WEXT,
316 EMC_WDV,
317 EMC_WDV_MASK,
318 EMC_QUSE,
319 EMC_QUSE_WIDTH,
320 EMC_IBDLY,
321 EMC_EINPUT,
322 EMC_EINPUT_DURATION,
323 EMC_PUTERM_EXTRA,
324 EMC_PUTERM_WIDTH,
325 EMC_PUTERM_ADJ,
326 EMC_CDB_CNTL_1,
327 EMC_CDB_CNTL_2,
328 EMC_CDB_CNTL_3,
329 EMC_QRST,
330 EMC_QSAFE,
331 EMC_RDV,
332 EMC_RDV_MASK,
333 EMC_REFRESH,
334 EMC_BURST_REFRESH_NUM,
335 EMC_PRE_REFRESH_REQ_CNT,
336 EMC_PDEX2WR,
337 EMC_PDEX2RD,
338 EMC_PCHG2PDEN,
339 EMC_ACT2PDEN,
340 EMC_AR2PDEN,
341 EMC_RW2PDEN,
342 EMC_TXSR,
343 EMC_TXSRDLL,
344 EMC_TCKE,
345 EMC_TCKESR,
346 EMC_TPD,
347 EMC_TFAW,
348 EMC_TRPAB,
349 EMC_TCLKSTABLE,
350 EMC_TCLKSTOP,
351 EMC_TREFBW,
352 EMC_FBIO_CFG6,
353 EMC_ODT_WRITE,
354 EMC_ODT_READ,
355 EMC_FBIO_CFG5,
356 EMC_CFG_DIG_DLL,
357 EMC_CFG_DIG_DLL_PERIOD,
358 EMC_DLL_XFORM_DQS0,
359 EMC_DLL_XFORM_DQS1,
360 EMC_DLL_XFORM_DQS2,
361 EMC_DLL_XFORM_DQS3,
362 EMC_DLL_XFORM_DQS4,
363 EMC_DLL_XFORM_DQS5,
364 EMC_DLL_XFORM_DQS6,
365 EMC_DLL_XFORM_DQS7,
366 EMC_DLL_XFORM_DQS8,
367 EMC_DLL_XFORM_DQS9,
368 EMC_DLL_XFORM_DQS10,
369 EMC_DLL_XFORM_DQS11,
370 EMC_DLL_XFORM_DQS12,
371 EMC_DLL_XFORM_DQS13,
372 EMC_DLL_XFORM_DQS14,
373 EMC_DLL_XFORM_DQS15,
374 EMC_DLL_XFORM_QUSE0,
375 EMC_DLL_XFORM_QUSE1,
376 EMC_DLL_XFORM_QUSE2,
377 EMC_DLL_XFORM_QUSE3,
378 EMC_DLL_XFORM_QUSE4,
379 EMC_DLL_XFORM_QUSE5,
380 EMC_DLL_XFORM_QUSE6,
381 EMC_DLL_XFORM_QUSE7,
382 EMC_DLL_XFORM_ADDR0,
383 EMC_DLL_XFORM_ADDR1,
384 EMC_DLL_XFORM_ADDR2,
385 EMC_DLL_XFORM_ADDR3,
386 EMC_DLL_XFORM_ADDR4,
387 EMC_DLL_XFORM_ADDR5,
388 EMC_DLL_XFORM_QUSE8,
389 EMC_DLL_XFORM_QUSE9,
390 EMC_DLL_XFORM_QUSE10,
391 EMC_DLL_XFORM_QUSE11,
392 EMC_DLL_XFORM_QUSE12,
393 EMC_DLL_XFORM_QUSE13,
394 EMC_DLL_XFORM_QUSE14,
395 EMC_DLL_XFORM_QUSE15,
396 EMC_DLI_TRIM_TXDQS0,
397 EMC_DLI_TRIM_TXDQS1,
398 EMC_DLI_TRIM_TXDQS2,
399 EMC_DLI_TRIM_TXDQS3,
400 EMC_DLI_TRIM_TXDQS4,
401 EMC_DLI_TRIM_TXDQS5,
402 EMC_DLI_TRIM_TXDQS6,
403 EMC_DLI_TRIM_TXDQS7,
404 EMC_DLI_TRIM_TXDQS8,
405 EMC_DLI_TRIM_TXDQS9,
406 EMC_DLI_TRIM_TXDQS10,
407 EMC_DLI_TRIM_TXDQS11,
408 EMC_DLI_TRIM_TXDQS12,
409 EMC_DLI_TRIM_TXDQS13,
410 EMC_DLI_TRIM_TXDQS14,
411 EMC_DLI_TRIM_TXDQS15,
412 EMC_DLL_XFORM_DQ0,
413 EMC_DLL_XFORM_DQ1,
414 EMC_DLL_XFORM_DQ2,
415 EMC_DLL_XFORM_DQ3,
416 EMC_DLL_XFORM_DQ4,
417 EMC_DLL_XFORM_DQ5,
418 EMC_DLL_XFORM_DQ6,
419 EMC_DLL_XFORM_DQ7,
420 EMC_XM2CMDPADCTRL,
421 EMC_XM2CMDPADCTRL4,
422 EMC_XM2CMDPADCTRL5,
423 EMC_XM2DQPADCTRL2,
424 EMC_XM2DQPADCTRL3,
425 EMC_XM2CLKPADCTRL,
426 EMC_XM2CLKPADCTRL2,
427 EMC_XM2COMPPADCTRL,
428 EMC_XM2VTTGENPADCTRL,
429 EMC_XM2VTTGENPADCTRL2,
430 EMC_XM2VTTGENPADCTRL3,
431 EMC_XM2DQSPADCTRL3,
432 EMC_XM2DQSPADCTRL4,
433 EMC_XM2DQSPADCTRL5,
434 EMC_XM2DQSPADCTRL6,
435 EMC_DSR_VTTGEN_DRV,
436 EMC_TXDSRVTTGEN,
437 EMC_FBIO_SPARE,
438 EMC_ZCAL_WAIT_CNT,
439 EMC_MRS_WAIT_CNT2,
440 EMC_CTT,
441 EMC_CTT_DURATION,
442 EMC_CFG_PIPE,
443 EMC_DYN_SELF_REF_CONTROL,
444 EMC_QPOP
445};
446
447struct emc_timing {
448 unsigned long rate;
449
450 u32 emc_burst_data[ARRAY_SIZE(emc_burst_regs)];
451
452 u32 emc_auto_cal_config;
453 u32 emc_auto_cal_config2;
454 u32 emc_auto_cal_config3;
455 u32 emc_auto_cal_interval;
456 u32 emc_bgbias_ctl0;
457 u32 emc_cfg;
458 u32 emc_cfg_2;
459 u32 emc_ctt_term_ctrl;
460 u32 emc_mode_1;
461 u32 emc_mode_2;
462 u32 emc_mode_4;
463 u32 emc_mode_reset;
464 u32 emc_mrs_wait_cnt;
465 u32 emc_sel_dpd_ctrl;
466 u32 emc_xm2dqspadctrl2;
467 u32 emc_zcal_cnt_long;
468 u32 emc_zcal_interval;
469};
470
471struct tegra_emc {
472 struct device *dev;
473
474 struct tegra_mc *mc;
475
476 void __iomem *regs;
477
478 enum emc_dram_type dram_type;
479 unsigned int dram_num;
480
481 struct emc_timing last_timing;
482 struct emc_timing *timings;
483 unsigned int num_timings;
484};
485
486
487
488static void emc_ccfifo_writel(struct tegra_emc *emc, u32 value,
489 unsigned long offset)
490{
491 writel(value, emc->regs + EMC_CCFIFO_DATA);
492 writel(offset, emc->regs + EMC_CCFIFO_ADDR);
493}
494
495static void emc_seq_update_timing(struct tegra_emc *emc)
496{
497 unsigned int i;
498 u32 value;
499
500 writel(1, emc->regs + EMC_TIMING_CONTROL);
501
502 for (i = 0; i < EMC_STATUS_UPDATE_TIMEOUT; ++i) {
503 value = readl(emc->regs + EMC_STATUS);
504 if ((value & EMC_STATUS_TIMING_UPDATE_STALLED) == 0)
505 return;
506 udelay(1);
507 }
508
509 dev_err(emc->dev, "timing update timed out\n");
510}
511
512static void emc_seq_disable_auto_cal(struct tegra_emc *emc)
513{
514 unsigned int i;
515 u32 value;
516
517 writel(0, emc->regs + EMC_AUTO_CAL_INTERVAL);
518
519 for (i = 0; i < EMC_STATUS_UPDATE_TIMEOUT; ++i) {
520 value = readl(emc->regs + EMC_AUTO_CAL_STATUS);
521 if ((value & EMC_AUTO_CAL_STATUS_ACTIVE) == 0)
522 return;
523 udelay(1);
524 }
525
526 dev_err(emc->dev, "auto cal disable timed out\n");
527}
528
529static void emc_seq_wait_clkchange(struct tegra_emc *emc)
530{
531 unsigned int i;
532 u32 value;
533
534 for (i = 0; i < EMC_STATUS_UPDATE_TIMEOUT; ++i) {
535 value = readl(emc->regs + EMC_INTSTATUS);
536 if (value & EMC_INTSTATUS_CLKCHANGE_COMPLETE)
537 return;
538 udelay(1);
539 }
540
541 dev_err(emc->dev, "clock change timed out\n");
542}
543
544static struct emc_timing *tegra_emc_find_timing(struct tegra_emc *emc,
545 unsigned long rate)
546{
547 struct emc_timing *timing = NULL;
548 unsigned int i;
549
550 for (i = 0; i < emc->num_timings; i++) {
551 if (emc->timings[i].rate == rate) {
552 timing = &emc->timings[i];
553 break;
554 }
555 }
556
557 if (!timing) {
558 dev_err(emc->dev, "no timing for rate %lu\n", rate);
559 return NULL;
560 }
561
562 return timing;
563}
564
565int tegra_emc_prepare_timing_change(struct tegra_emc *emc,
566 unsigned long rate)
567{
568 struct emc_timing *timing = tegra_emc_find_timing(emc, rate);
569 struct emc_timing *last = &emc->last_timing;
570 enum emc_dll_change dll_change;
571 unsigned int pre_wait = 0;
572 u32 val, val2, mask;
573 bool update = false;
574 unsigned int i;
575
576 if (!timing)
577 return -ENOENT;
578
579 if ((last->emc_mode_1 & 0x1) == (timing->emc_mode_1 & 0x1))
580 dll_change = DLL_CHANGE_NONE;
581 else if (timing->emc_mode_1 & 0x1)
582 dll_change = DLL_CHANGE_ON;
583 else
584 dll_change = DLL_CHANGE_OFF;
585
586
587 writel(EMC_INTSTATUS_CLKCHANGE_COMPLETE, emc->regs + EMC_INTSTATUS);
588
589
590 val = readl(emc->regs + EMC_CFG);
591 if (val & EMC_CFG_PWR_MASK) {
592 val &= ~EMC_CFG_POWER_FEATURES_MASK;
593 writel(val, emc->regs + EMC_CFG);
594
595 pre_wait = 5;
596 }
597
598
599 if (emc->dram_type == DRAM_TYPE_DDR3)
600 mask = EMC_SEL_DPD_CTRL_DDR3_MASK;
601 else
602 mask = EMC_SEL_DPD_CTRL_MASK;
603
604 val = readl(emc->regs + EMC_SEL_DPD_CTRL);
605 if (val & mask) {
606 val &= ~mask;
607 writel(val, emc->regs + EMC_SEL_DPD_CTRL);
608 }
609
610
611 val = readl(emc->regs + EMC_BGBIAS_CTL0);
612 val2 = last->emc_bgbias_ctl0;
613 if (!(timing->emc_bgbias_ctl0 &
614 EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_RX) &&
615 (val & EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_RX)) {
616 val2 &= ~EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_RX;
617 update = true;
618 }
619
620 if ((val & EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD) ||
621 (val & EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_VTTGEN)) {
622 update = true;
623 }
624
625 if (update) {
626 writel(val2, emc->regs + EMC_BGBIAS_CTL0);
627 if (pre_wait < 5)
628 pre_wait = 5;
629 }
630
631 update = false;
632 val = readl(emc->regs + EMC_XM2DQSPADCTRL2);
633 if (timing->emc_xm2dqspadctrl2 & EMC_XM2DQSPADCTRL2_VREF_ENABLE &&
634 !(val & EMC_XM2DQSPADCTRL2_VREF_ENABLE)) {
635 val |= EMC_XM2DQSPADCTRL2_VREF_ENABLE;
636 update = true;
637 }
638
639 if (timing->emc_xm2dqspadctrl2 & EMC_XM2DQSPADCTRL2_RX_FT_REC_ENABLE &&
640 !(val & EMC_XM2DQSPADCTRL2_RX_FT_REC_ENABLE)) {
641 val |= EMC_XM2DQSPADCTRL2_RX_FT_REC_ENABLE;
642 update = true;
643 }
644
645 if (update) {
646 writel(val, emc->regs + EMC_XM2DQSPADCTRL2);
647 if (pre_wait < 30)
648 pre_wait = 30;
649 }
650
651
652 if (pre_wait) {
653 emc_seq_update_timing(emc);
654 udelay(pre_wait);
655 }
656
657
658 if (last->emc_ctt_term_ctrl != timing->emc_ctt_term_ctrl) {
659 emc_seq_disable_auto_cal(emc);
660 writel(timing->emc_ctt_term_ctrl,
661 emc->regs + EMC_CTT_TERM_CTRL);
662 emc_seq_update_timing(emc);
663 }
664
665
666 for (i = 0; i < ARRAY_SIZE(timing->emc_burst_data); ++i)
667 writel(timing->emc_burst_data[i],
668 emc->regs + emc_burst_regs[i]);
669
670 writel(timing->emc_xm2dqspadctrl2, emc->regs + EMC_XM2DQSPADCTRL2);
671 writel(timing->emc_zcal_interval, emc->regs + EMC_ZCAL_INTERVAL);
672
673 tegra_mc_write_emem_configuration(emc->mc, timing->rate);
674
675 val = timing->emc_cfg & ~EMC_CFG_POWER_FEATURES_MASK;
676 emc_ccfifo_writel(emc, val, EMC_CFG);
677
678
679 if (timing->emc_auto_cal_config2 != last->emc_auto_cal_config2)
680 emc_ccfifo_writel(emc, timing->emc_auto_cal_config2,
681 EMC_AUTO_CAL_CONFIG2);
682
683 if (timing->emc_auto_cal_config3 != last->emc_auto_cal_config3)
684 emc_ccfifo_writel(emc, timing->emc_auto_cal_config3,
685 EMC_AUTO_CAL_CONFIG3);
686
687 if (timing->emc_auto_cal_config != last->emc_auto_cal_config) {
688 val = timing->emc_auto_cal_config;
689 val &= EMC_AUTO_CAL_CONFIG_AUTO_CAL_START;
690 emc_ccfifo_writel(emc, val, EMC_AUTO_CAL_CONFIG);
691 }
692
693
694 if (emc->dram_type == DRAM_TYPE_DDR3 &&
695 dll_change == DLL_CHANGE_ON) {
696 u32 cnt = 512;
697
698 if (timing->emc_zcal_interval != 0 &&
699 last->emc_zcal_interval == 0)
700 cnt -= emc->dram_num * 256;
701
702 val = (timing->emc_mrs_wait_cnt
703 & EMC_MRS_WAIT_CNT_SHORT_WAIT_MASK)
704 >> EMC_MRS_WAIT_CNT_SHORT_WAIT_SHIFT;
705 if (cnt < val)
706 cnt = val;
707
708 val = timing->emc_mrs_wait_cnt
709 & ~EMC_MRS_WAIT_CNT_LONG_WAIT_MASK;
710 val |= (cnt << EMC_MRS_WAIT_CNT_LONG_WAIT_SHIFT)
711 & EMC_MRS_WAIT_CNT_LONG_WAIT_MASK;
712
713 writel(val, emc->regs + EMC_MRS_WAIT_CNT);
714 }
715
716 val = timing->emc_cfg_2;
717 val &= ~EMC_CFG_2_DIS_STP_OB_CLK_DURING_NON_WR;
718 emc_ccfifo_writel(emc, val, EMC_CFG_2);
719
720
721 if (emc->dram_type == DRAM_TYPE_DDR3 && dll_change == DLL_CHANGE_OFF)
722 emc_ccfifo_writel(emc, timing->emc_mode_1, EMC_EMRS);
723
724
725 emc_ccfifo_writel(emc, EMC_REFCTRL_DEV_SEL(emc->dram_num),
726 EMC_REFCTRL);
727 if (emc->dram_type == DRAM_TYPE_DDR3)
728 emc_ccfifo_writel(emc, EMC_DRAM_DEV_SEL(emc->dram_num) |
729 EMC_SELF_REF_CMD_ENABLED,
730 EMC_SELF_REF);
731
732
733 emc_ccfifo_writel(emc, 1, EMC_STALL_THEN_EXE_AFTER_CLKCHANGE);
734
735
736 if (emc->dram_type == DRAM_TYPE_DDR3)
737 emc_ccfifo_writel(emc, EMC_DRAM_DEV_SEL(emc->dram_num),
738 EMC_SELF_REF);
739 emc_ccfifo_writel(emc, EMC_REFCTRL_DEV_SEL(emc->dram_num) |
740 EMC_REFCTRL_ENABLE,
741 EMC_REFCTRL);
742
743
744 if (emc->dram_type == DRAM_TYPE_DDR3) {
745 if (timing->emc_mode_1 != last->emc_mode_1)
746 emc_ccfifo_writel(emc, timing->emc_mode_1, EMC_EMRS);
747 if (timing->emc_mode_2 != last->emc_mode_2)
748 emc_ccfifo_writel(emc, timing->emc_mode_2, EMC_EMRS2);
749
750 if ((timing->emc_mode_reset != last->emc_mode_reset) ||
751 dll_change == DLL_CHANGE_ON) {
752 val = timing->emc_mode_reset;
753 if (dll_change == DLL_CHANGE_ON) {
754 val |= EMC_MODE_SET_DLL_RESET;
755 val |= EMC_MODE_SET_LONG_CNT;
756 } else {
757 val &= ~EMC_MODE_SET_DLL_RESET;
758 }
759 emc_ccfifo_writel(emc, val, EMC_MRS);
760 }
761 } else {
762 if (timing->emc_mode_2 != last->emc_mode_2)
763 emc_ccfifo_writel(emc, timing->emc_mode_2, EMC_MRW2);
764 if (timing->emc_mode_1 != last->emc_mode_1)
765 emc_ccfifo_writel(emc, timing->emc_mode_1, EMC_MRW);
766 if (timing->emc_mode_4 != last->emc_mode_4)
767 emc_ccfifo_writel(emc, timing->emc_mode_4, EMC_MRW4);
768 }
769
770
771 if (timing->emc_zcal_interval != 0 && last->emc_zcal_interval == 0) {
772 emc_ccfifo_writel(emc, EMC_ZQ_CAL_LONG_CMD_DEV0, EMC_ZQ_CAL);
773 if (emc->dram_num > 1)
774 emc_ccfifo_writel(emc, EMC_ZQ_CAL_LONG_CMD_DEV1,
775 EMC_ZQ_CAL);
776 }
777
778
779 emc_ccfifo_writel(emc, 0, EMC_CCFIFO_STATUS);
780
781 if (timing->emc_cfg_2 & EMC_CFG_2_DIS_STP_OB_CLK_DURING_NON_WR)
782 emc_ccfifo_writel(emc, timing->emc_cfg_2, EMC_CFG_2);
783
784
785 emc_seq_disable_auto_cal(emc);
786
787
788 readl(emc->regs + EMC_INTSTATUS);
789
790 return 0;
791}
792
793void tegra_emc_complete_timing_change(struct tegra_emc *emc,
794 unsigned long rate)
795{
796 struct emc_timing *timing = tegra_emc_find_timing(emc, rate);
797 struct emc_timing *last = &emc->last_timing;
798 u32 val;
799
800 if (!timing)
801 return;
802
803
804 emc_seq_wait_clkchange(emc);
805
806
807 if (timing->emc_ctt_term_ctrl != last->emc_ctt_term_ctrl)
808 writel(timing->emc_auto_cal_interval,
809 emc->regs + EMC_AUTO_CAL_INTERVAL);
810
811
812 if (timing->emc_cfg & EMC_CFG_PWR_MASK)
813 writel(timing->emc_cfg, emc->regs + EMC_CFG);
814
815
816 writel(timing->emc_zcal_cnt_long, emc->regs + EMC_ZCAL_WAIT_CNT);
817
818
819 if (emc->dram_type == DRAM_TYPE_LPDDR3 &&
820 timing->emc_bgbias_ctl0 &
821 EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_RX) {
822 val = timing->emc_bgbias_ctl0;
823 val |= EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_VTTGEN;
824 val |= EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD;
825 writel(val, emc->regs + EMC_BGBIAS_CTL0);
826 } else {
827 if (emc->dram_type == DRAM_TYPE_DDR3 &&
828 readl(emc->regs + EMC_BGBIAS_CTL0) !=
829 timing->emc_bgbias_ctl0) {
830 writel(timing->emc_bgbias_ctl0,
831 emc->regs + EMC_BGBIAS_CTL0);
832 }
833
834 writel(timing->emc_auto_cal_interval,
835 emc->regs + EMC_AUTO_CAL_INTERVAL);
836 }
837
838
839 udelay(2);
840
841
842 writel(timing->emc_sel_dpd_ctrl, emc->regs + EMC_SEL_DPD_CTRL);
843 emc_seq_update_timing(emc);
844
845 emc->last_timing = *timing;
846}
847
848
849
850static void emc_read_current_timing(struct tegra_emc *emc,
851 struct emc_timing *timing)
852{
853 unsigned int i;
854
855 for (i = 0; i < ARRAY_SIZE(emc_burst_regs); ++i)
856 timing->emc_burst_data[i] =
857 readl(emc->regs + emc_burst_regs[i]);
858
859 timing->emc_cfg = readl(emc->regs + EMC_CFG);
860
861 timing->emc_auto_cal_interval = 0;
862 timing->emc_zcal_cnt_long = 0;
863 timing->emc_mode_1 = 0;
864 timing->emc_mode_2 = 0;
865 timing->emc_mode_4 = 0;
866 timing->emc_mode_reset = 0;
867}
868
869static int emc_init(struct tegra_emc *emc)
870{
871 emc->dram_type = readl(emc->regs + EMC_FBIO_CFG5);
872 emc->dram_type &= EMC_FBIO_CFG5_DRAM_TYPE_MASK;
873 emc->dram_type >>= EMC_FBIO_CFG5_DRAM_TYPE_SHIFT;
874
875 emc->dram_num = tegra_mc_get_emem_device_count(emc->mc);
876
877 emc_read_current_timing(emc, &emc->last_timing);
878
879 return 0;
880}
881
882static int load_one_timing_from_dt(struct tegra_emc *emc,
883 struct emc_timing *timing,
884 struct device_node *node)
885{
886 u32 value;
887 int err;
888
889 err = of_property_read_u32(node, "clock-frequency", &value);
890 if (err) {
891 dev_err(emc->dev, "timing %s: failed to read rate: %d\n",
892 node->name, err);
893 return err;
894 }
895
896 timing->rate = value;
897
898 err = of_property_read_u32_array(node, "nvidia,emc-configuration",
899 timing->emc_burst_data,
900 ARRAY_SIZE(timing->emc_burst_data));
901 if (err) {
902 dev_err(emc->dev,
903 "timing %s: failed to read emc burst data: %d\n",
904 node->name, err);
905 return err;
906 }
907
908#define EMC_READ_PROP(prop, dtprop) { \
909 err = of_property_read_u32(node, dtprop, &timing->prop); \
910 if (err) { \
911 dev_err(emc->dev, "timing %s: failed to read " #prop ": %d\n", \
912 node->name, err); \
913 return err; \
914 } \
915}
916
917 EMC_READ_PROP(emc_auto_cal_config, "nvidia,emc-auto-cal-config")
918 EMC_READ_PROP(emc_auto_cal_config2, "nvidia,emc-auto-cal-config2")
919 EMC_READ_PROP(emc_auto_cal_config3, "nvidia,emc-auto-cal-config3")
920 EMC_READ_PROP(emc_auto_cal_interval, "nvidia,emc-auto-cal-interval")
921 EMC_READ_PROP(emc_bgbias_ctl0, "nvidia,emc-bgbias-ctl0")
922 EMC_READ_PROP(emc_cfg, "nvidia,emc-cfg")
923 EMC_READ_PROP(emc_cfg_2, "nvidia,emc-cfg-2")
924 EMC_READ_PROP(emc_ctt_term_ctrl, "nvidia,emc-ctt-term-ctrl")
925 EMC_READ_PROP(emc_mode_1, "nvidia,emc-mode-1")
926 EMC_READ_PROP(emc_mode_2, "nvidia,emc-mode-2")
927 EMC_READ_PROP(emc_mode_4, "nvidia,emc-mode-4")
928 EMC_READ_PROP(emc_mode_reset, "nvidia,emc-mode-reset")
929 EMC_READ_PROP(emc_mrs_wait_cnt, "nvidia,emc-mrs-wait-cnt")
930 EMC_READ_PROP(emc_sel_dpd_ctrl, "nvidia,emc-sel-dpd-ctrl")
931 EMC_READ_PROP(emc_xm2dqspadctrl2, "nvidia,emc-xm2dqspadctrl2")
932 EMC_READ_PROP(emc_zcal_cnt_long, "nvidia,emc-zcal-cnt-long")
933 EMC_READ_PROP(emc_zcal_interval, "nvidia,emc-zcal-interval")
934
935#undef EMC_READ_PROP
936
937 return 0;
938}
939
940static int cmp_timings(const void *_a, const void *_b)
941{
942 const struct emc_timing *a = _a;
943 const struct emc_timing *b = _b;
944
945 if (a->rate < b->rate)
946 return -1;
947 else if (a->rate == b->rate)
948 return 0;
949 else
950 return 1;
951}
952
953static int tegra_emc_load_timings_from_dt(struct tegra_emc *emc,
954 struct device_node *node)
955{
956 int child_count = of_get_child_count(node);
957 struct device_node *child;
958 struct emc_timing *timing;
959 unsigned int i = 0;
960 int err;
961
962 emc->timings = devm_kcalloc(emc->dev, child_count, sizeof(*timing),
963 GFP_KERNEL);
964 if (!emc->timings)
965 return -ENOMEM;
966
967 emc->num_timings = child_count;
968
969 for_each_child_of_node(node, child) {
970 timing = &emc->timings[i++];
971
972 err = load_one_timing_from_dt(emc, timing, child);
973 if (err) {
974 of_node_put(child);
975 return err;
976 }
977 }
978
979 sort(emc->timings, emc->num_timings, sizeof(*timing), cmp_timings,
980 NULL);
981
982 return 0;
983}
984
985static const struct of_device_id tegra_emc_of_match[] = {
986 { .compatible = "nvidia,tegra124-emc" },
987 {}
988};
989
990static struct device_node *
991tegra_emc_find_node_by_ram_code(struct device_node *node, u32 ram_code)
992{
993 struct device_node *np;
994 int err;
995
996 for_each_child_of_node(node, np) {
997 u32 value;
998
999 err = of_property_read_u32(np, "nvidia,ram-code", &value);
1000 if (err || (value != ram_code))
1001 continue;
1002
1003 return np;
1004 }
1005
1006 return NULL;
1007}
1008
1009
1010
1011static int emc_debug_rate_get(void *data, u64 *rate)
1012{
1013 struct clk *c = data;
1014
1015 *rate = clk_get_rate(c);
1016
1017 return 0;
1018}
1019
1020static int emc_debug_rate_set(void *data, u64 rate)
1021{
1022 struct clk *c = data;
1023
1024 return clk_set_rate(c, rate);
1025}
1026
1027DEFINE_SIMPLE_ATTRIBUTE(emc_debug_rate_fops, emc_debug_rate_get,
1028 emc_debug_rate_set, "%lld\n");
1029
1030static int emc_debug_supported_rates_show(struct seq_file *s, void *data)
1031{
1032 struct tegra_emc *emc = s->private;
1033 const char *prefix = "";
1034 unsigned int i;
1035
1036 for (i = 0; i < emc->num_timings; i++) {
1037 struct emc_timing *timing = &emc->timings[i];
1038
1039 seq_printf(s, "%s%lu", prefix, timing->rate);
1040
1041 prefix = " ";
1042 }
1043
1044 seq_puts(s, "\n");
1045
1046 return 0;
1047}
1048
1049static int emc_debug_supported_rates_open(struct inode *inode,
1050 struct file *file)
1051{
1052 return single_open(file, emc_debug_supported_rates_show,
1053 inode->i_private);
1054}
1055
1056static const struct file_operations emc_debug_supported_rates_fops = {
1057 .open = emc_debug_supported_rates_open,
1058 .read = seq_read,
1059 .llseek = seq_lseek,
1060 .release = single_release,
1061};
1062
1063static void emc_debugfs_init(struct device *dev, struct tegra_emc *emc)
1064{
1065 struct dentry *root, *file;
1066 struct clk *clk;
1067
1068 root = debugfs_create_dir("emc", NULL);
1069 if (!root) {
1070 dev_err(dev, "failed to create debugfs directory\n");
1071 return;
1072 }
1073
1074 clk = clk_get_sys("tegra-clk-debug", "emc");
1075 if (IS_ERR(clk)) {
1076 dev_err(dev, "failed to get debug clock: %ld\n", PTR_ERR(clk));
1077 return;
1078 }
1079
1080 file = debugfs_create_file("rate", S_IRUGO | S_IWUSR, root, clk,
1081 &emc_debug_rate_fops);
1082 if (!file)
1083 dev_err(dev, "failed to create debugfs entry\n");
1084
1085 file = debugfs_create_file("supported_rates", S_IRUGO, root, emc,
1086 &emc_debug_supported_rates_fops);
1087 if (!file)
1088 dev_err(dev, "failed to create debugfs entry\n");
1089}
1090
1091static int tegra_emc_probe(struct platform_device *pdev)
1092{
1093 struct platform_device *mc;
1094 struct device_node *np;
1095 struct tegra_emc *emc;
1096 struct resource *res;
1097 u32 ram_code;
1098 int err;
1099
1100 emc = devm_kzalloc(&pdev->dev, sizeof(*emc), GFP_KERNEL);
1101 if (!emc)
1102 return -ENOMEM;
1103
1104 emc->dev = &pdev->dev;
1105
1106 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1107 emc->regs = devm_ioremap_resource(&pdev->dev, res);
1108 if (IS_ERR(emc->regs))
1109 return PTR_ERR(emc->regs);
1110
1111 np = of_parse_phandle(pdev->dev.of_node, "nvidia,memory-controller", 0);
1112 if (!np) {
1113 dev_err(&pdev->dev, "could not get memory controller\n");
1114 return -ENOENT;
1115 }
1116
1117 mc = of_find_device_by_node(np);
1118 of_node_put(np);
1119 if (!mc)
1120 return -ENOENT;
1121
1122 emc->mc = platform_get_drvdata(mc);
1123 if (!emc->mc)
1124 return -EPROBE_DEFER;
1125
1126 ram_code = tegra_read_ram_code();
1127
1128 np = tegra_emc_find_node_by_ram_code(pdev->dev.of_node, ram_code);
1129 if (!np) {
1130 dev_err(&pdev->dev,
1131 "no memory timings for RAM code %u found in DT\n",
1132 ram_code);
1133 return -ENOENT;
1134 }
1135
1136 err = tegra_emc_load_timings_from_dt(emc, np);
1137 of_node_put(np);
1138 if (err)
1139 return err;
1140
1141 if (emc->num_timings == 0) {
1142 dev_err(&pdev->dev,
1143 "no memory timings for RAM code %u registered\n",
1144 ram_code);
1145 return -ENOENT;
1146 }
1147
1148 err = emc_init(emc);
1149 if (err) {
1150 dev_err(&pdev->dev, "EMC initialization failed: %d\n", err);
1151 return err;
1152 }
1153
1154 platform_set_drvdata(pdev, emc);
1155
1156 if (IS_ENABLED(CONFIG_DEBUG_FS))
1157 emc_debugfs_init(&pdev->dev, emc);
1158
1159 return 0;
1160};
1161
1162static struct platform_driver tegra_emc_driver = {
1163 .probe = tegra_emc_probe,
1164 .driver = {
1165 .name = "tegra-emc",
1166 .of_match_table = tegra_emc_of_match,
1167 .suppress_bind_attrs = true,
1168 },
1169};
1170
1171static int tegra_emc_init(void)
1172{
1173 return platform_driver_register(&tegra_emc_driver);
1174}
1175subsys_initcall(tegra_emc_init);
1176
