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Merge branch 'u-boot-imx/master' into 'u-boot-arm/master'
[karo-tx-uboot.git] / drivers / mmc / tegra_mmc.c
1 /*
2  * (C) Copyright 2009 SAMSUNG Electronics
3  * Minkyu Kang <mk7.kang@samsung.com>
4  * Jaehoon Chung <jh80.chung@samsung.com>
5  * Portions Copyright 2011-2013 NVIDIA Corporation
6  *
7  * SPDX-License-Identifier:     GPL-2.0+
8  */
9
10 #include <bouncebuf.h>
11 #include <common.h>
12 #include <asm/gpio.h>
13 #include <asm/io.h>
14 #include <asm/arch/clock.h>
15 #include <asm/arch-tegra/clk_rst.h>
16 #include <asm/arch-tegra/tegra_mmc.h>
17 #include <mmc.h>
18
19 DECLARE_GLOBAL_DATA_PTR;
20
21 struct mmc mmc_dev[MAX_HOSTS];
22 struct mmc_host mmc_host[MAX_HOSTS];
23
24 #ifndef CONFIG_OF_CONTROL
25 #error "Please enable device tree support to use this driver"
26 #endif
27
28 static void mmc_set_power(struct mmc_host *host, unsigned short power)
29 {
30         u8 pwr = 0;
31         debug("%s: power = %x\n", __func__, power);
32
33         if (power != (unsigned short)-1) {
34                 switch (1 << power) {
35                 case MMC_VDD_165_195:
36                         pwr = TEGRA_MMC_PWRCTL_SD_BUS_VOLTAGE_V1_8;
37                         break;
38                 case MMC_VDD_29_30:
39                 case MMC_VDD_30_31:
40                         pwr = TEGRA_MMC_PWRCTL_SD_BUS_VOLTAGE_V3_0;
41                         break;
42                 case MMC_VDD_32_33:
43                 case MMC_VDD_33_34:
44                         pwr = TEGRA_MMC_PWRCTL_SD_BUS_VOLTAGE_V3_3;
45                         break;
46                 }
47         }
48         debug("%s: pwr = %X\n", __func__, pwr);
49
50         /* Set the bus voltage first (if any) */
51         writeb(pwr, &host->reg->pwrcon);
52         if (pwr == 0)
53                 return;
54
55         /* Now enable bus power */
56         pwr |= TEGRA_MMC_PWRCTL_SD_BUS_POWER;
57         writeb(pwr, &host->reg->pwrcon);
58 }
59
60 static void mmc_prepare_data(struct mmc_host *host, struct mmc_data *data,
61                                 struct bounce_buffer *bbstate)
62 {
63         unsigned char ctrl;
64
65
66         debug("buf: %p (%p), data->blocks: %u, data->blocksize: %u\n",
67                 bbstate->bounce_buffer, bbstate->user_buffer, data->blocks,
68                 data->blocksize);
69
70         writel((u32)bbstate->bounce_buffer, &host->reg->sysad);
71         /*
72          * DMASEL[4:3]
73          * 00 = Selects SDMA
74          * 01 = Reserved
75          * 10 = Selects 32-bit Address ADMA2
76          * 11 = Selects 64-bit Address ADMA2
77          */
78         ctrl = readb(&host->reg->hostctl);
79         ctrl &= ~TEGRA_MMC_HOSTCTL_DMASEL_MASK;
80         ctrl |= TEGRA_MMC_HOSTCTL_DMASEL_SDMA;
81         writeb(ctrl, &host->reg->hostctl);
82
83         /* We do not handle DMA boundaries, so set it to max (512 KiB) */
84         writew((7 << 12) | (data->blocksize & 0xFFF), &host->reg->blksize);
85         writew(data->blocks, &host->reg->blkcnt);
86 }
87
88 static void mmc_set_transfer_mode(struct mmc_host *host, struct mmc_data *data)
89 {
90         unsigned short mode;
91         debug(" mmc_set_transfer_mode called\n");
92         /*
93          * TRNMOD
94          * MUL1SIN0[5]  : Multi/Single Block Select
95          * RD1WT0[4]    : Data Transfer Direction Select
96          *      1 = read
97          *      0 = write
98          * ENACMD12[2]  : Auto CMD12 Enable
99          * ENBLKCNT[1]  : Block Count Enable
100          * ENDMA[0]     : DMA Enable
101          */
102         mode = (TEGRA_MMC_TRNMOD_DMA_ENABLE |
103                 TEGRA_MMC_TRNMOD_BLOCK_COUNT_ENABLE);
104
105         if (data->blocks > 1)
106                 mode |= TEGRA_MMC_TRNMOD_MULTI_BLOCK_SELECT;
107
108         if (data->flags & MMC_DATA_READ)
109                 mode |= TEGRA_MMC_TRNMOD_DATA_XFER_DIR_SEL_READ;
110
111         writew(mode, &host->reg->trnmod);
112 }
113
114 static int mmc_wait_inhibit(struct mmc_host *host,
115                             struct mmc_cmd *cmd,
116                             struct mmc_data *data,
117                             unsigned int timeout)
118 {
119         /*
120          * PRNSTS
121          * CMDINHDAT[1] : Command Inhibit (DAT)
122          * CMDINHCMD[0] : Command Inhibit (CMD)
123          */
124         unsigned int mask = TEGRA_MMC_PRNSTS_CMD_INHIBIT_CMD;
125
126         /*
127          * We shouldn't wait for data inhibit for stop commands, even
128          * though they might use busy signaling
129          */
130         if ((data == NULL) && (cmd->resp_type & MMC_RSP_BUSY))
131                 mask |= TEGRA_MMC_PRNSTS_CMD_INHIBIT_DAT;
132
133         while (readl(&host->reg->prnsts) & mask) {
134                 if (timeout == 0) {
135                         printf("%s: timeout error\n", __func__);
136                         return -1;
137                 }
138                 timeout--;
139                 udelay(1000);
140         }
141
142         return 0;
143 }
144
145 static int mmc_send_cmd_bounced(struct mmc *mmc, struct mmc_cmd *cmd,
146                         struct mmc_data *data, struct bounce_buffer *bbstate)
147 {
148         struct mmc_host *host = (struct mmc_host *)mmc->priv;
149         int flags, i;
150         int result;
151         unsigned int mask = 0;
152         unsigned int retry = 0x100000;
153         debug(" mmc_send_cmd called\n");
154
155         result = mmc_wait_inhibit(host, cmd, data, 10 /* ms */);
156
157         if (result < 0)
158                 return result;
159
160         if (data)
161                 mmc_prepare_data(host, data, bbstate);
162
163         debug("cmd->arg: %08x\n", cmd->cmdarg);
164         writel(cmd->cmdarg, &host->reg->argument);
165
166         if (data)
167                 mmc_set_transfer_mode(host, data);
168
169         if ((cmd->resp_type & MMC_RSP_136) && (cmd->resp_type & MMC_RSP_BUSY))
170                 return -1;
171
172         /*
173          * CMDREG
174          * CMDIDX[13:8] : Command index
175          * DATAPRNT[5]  : Data Present Select
176          * ENCMDIDX[4]  : Command Index Check Enable
177          * ENCMDCRC[3]  : Command CRC Check Enable
178          * RSPTYP[1:0]
179          *      00 = No Response
180          *      01 = Length 136
181          *      10 = Length 48
182          *      11 = Length 48 Check busy after response
183          */
184         if (!(cmd->resp_type & MMC_RSP_PRESENT))
185                 flags = TEGRA_MMC_CMDREG_RESP_TYPE_SELECT_NO_RESPONSE;
186         else if (cmd->resp_type & MMC_RSP_136)
187                 flags = TEGRA_MMC_CMDREG_RESP_TYPE_SELECT_LENGTH_136;
188         else if (cmd->resp_type & MMC_RSP_BUSY)
189                 flags = TEGRA_MMC_CMDREG_RESP_TYPE_SELECT_LENGTH_48_BUSY;
190         else
191                 flags = TEGRA_MMC_CMDREG_RESP_TYPE_SELECT_LENGTH_48;
192
193         if (cmd->resp_type & MMC_RSP_CRC)
194                 flags |= TEGRA_MMC_TRNMOD_CMD_CRC_CHECK;
195         if (cmd->resp_type & MMC_RSP_OPCODE)
196                 flags |= TEGRA_MMC_TRNMOD_CMD_INDEX_CHECK;
197         if (data)
198                 flags |= TEGRA_MMC_TRNMOD_DATA_PRESENT_SELECT_DATA_TRANSFER;
199
200         debug("cmd: %d\n", cmd->cmdidx);
201
202         writew((cmd->cmdidx << 8) | flags, &host->reg->cmdreg);
203
204         for (i = 0; i < retry; i++) {
205                 mask = readl(&host->reg->norintsts);
206                 /* Command Complete */
207                 if (mask & TEGRA_MMC_NORINTSTS_CMD_COMPLETE) {
208                         if (!data)
209                                 writel(mask, &host->reg->norintsts);
210                         break;
211                 }
212         }
213
214         if (i == retry) {
215                 printf("%s: waiting for status update\n", __func__);
216                 writel(mask, &host->reg->norintsts);
217                 return TIMEOUT;
218         }
219
220         if (mask & TEGRA_MMC_NORINTSTS_CMD_TIMEOUT) {
221                 /* Timeout Error */
222                 debug("timeout: %08x cmd %d\n", mask, cmd->cmdidx);
223                 writel(mask, &host->reg->norintsts);
224                 return TIMEOUT;
225         } else if (mask & TEGRA_MMC_NORINTSTS_ERR_INTERRUPT) {
226                 /* Error Interrupt */
227                 debug("error: %08x cmd %d\n", mask, cmd->cmdidx);
228                 writel(mask, &host->reg->norintsts);
229                 return -1;
230         }
231
232         if (cmd->resp_type & MMC_RSP_PRESENT) {
233                 if (cmd->resp_type & MMC_RSP_136) {
234                         /* CRC is stripped so we need to do some shifting. */
235                         for (i = 0; i < 4; i++) {
236                                 unsigned int offset =
237                                         (unsigned int)(&host->reg->rspreg3 - i);
238                                 cmd->response[i] = readl(offset) << 8;
239
240                                 if (i != 3) {
241                                         cmd->response[i] |=
242                                                 readb(offset - 1);
243                                 }
244                                 debug("cmd->resp[%d]: %08x\n",
245                                                 i, cmd->response[i]);
246                         }
247                 } else if (cmd->resp_type & MMC_RSP_BUSY) {
248                         for (i = 0; i < retry; i++) {
249                                 /* PRNTDATA[23:20] : DAT[3:0] Line Signal */
250                                 if (readl(&host->reg->prnsts)
251                                         & (1 << 20))    /* DAT[0] */
252                                         break;
253                         }
254
255                         if (i == retry) {
256                                 printf("%s: card is still busy\n", __func__);
257                                 writel(mask, &host->reg->norintsts);
258                                 return TIMEOUT;
259                         }
260
261                         cmd->response[0] = readl(&host->reg->rspreg0);
262                         debug("cmd->resp[0]: %08x\n", cmd->response[0]);
263                 } else {
264                         cmd->response[0] = readl(&host->reg->rspreg0);
265                         debug("cmd->resp[0]: %08x\n", cmd->response[0]);
266                 }
267         }
268
269         if (data) {
270                 unsigned long   start = get_timer(0);
271
272                 while (1) {
273                         mask = readl(&host->reg->norintsts);
274
275                         if (mask & TEGRA_MMC_NORINTSTS_ERR_INTERRUPT) {
276                                 /* Error Interrupt */
277                                 writel(mask, &host->reg->norintsts);
278                                 printf("%s: error during transfer: 0x%08x\n",
279                                                 __func__, mask);
280                                 return -1;
281                         } else if (mask & TEGRA_MMC_NORINTSTS_DMA_INTERRUPT) {
282                                 /*
283                                  * DMA Interrupt, restart the transfer where
284                                  * it was interrupted.
285                                  */
286                                 unsigned int address = readl(&host->reg->sysad);
287
288                                 debug("DMA end\n");
289                                 writel(TEGRA_MMC_NORINTSTS_DMA_INTERRUPT,
290                                        &host->reg->norintsts);
291                                 writel(address, &host->reg->sysad);
292                         } else if (mask & TEGRA_MMC_NORINTSTS_XFER_COMPLETE) {
293                                 /* Transfer Complete */
294                                 debug("r/w is done\n");
295                                 break;
296                         } else if (get_timer(start) > 2000UL) {
297                                 writel(mask, &host->reg->norintsts);
298                                 printf("%s: MMC Timeout\n"
299                                        "    Interrupt status        0x%08x\n"
300                                        "    Interrupt status enable 0x%08x\n"
301                                        "    Interrupt signal enable 0x%08x\n"
302                                        "    Present status          0x%08x\n",
303                                        __func__, mask,
304                                        readl(&host->reg->norintstsen),
305                                        readl(&host->reg->norintsigen),
306                                        readl(&host->reg->prnsts));
307                                 return -1;
308                         }
309                 }
310                 writel(mask, &host->reg->norintsts);
311         }
312
313         udelay(1000);
314         return 0;
315 }
316
317 static int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
318                         struct mmc_data *data)
319 {
320         void *buf;
321         unsigned int bbflags;
322         size_t len;
323         struct bounce_buffer bbstate;
324         int ret;
325
326         if (data) {
327                 if (data->flags & MMC_DATA_READ) {
328                         buf = data->dest;
329                         bbflags = GEN_BB_WRITE;
330                 } else {
331                         buf = (void *)data->src;
332                         bbflags = GEN_BB_READ;
333                 }
334                 len = data->blocks * data->blocksize;
335
336                 bounce_buffer_start(&bbstate, buf, len, bbflags);
337         }
338
339         ret = mmc_send_cmd_bounced(mmc, cmd, data, &bbstate);
340
341         if (data)
342                 bounce_buffer_stop(&bbstate);
343
344         return ret;
345 }
346
347 static void mmc_change_clock(struct mmc_host *host, uint clock)
348 {
349         int div;
350         unsigned short clk;
351         unsigned long timeout;
352
353         debug(" mmc_change_clock called\n");
354
355         /*
356          * Change Tegra SDMMCx clock divisor here. Source is PLLP_OUT0
357          */
358         if (clock == 0)
359                 goto out;
360         clock_adjust_periph_pll_div(host->mmc_id, CLOCK_ID_PERIPH, clock,
361                                     &div);
362         debug("div = %d\n", div);
363
364         writew(0, &host->reg->clkcon);
365
366         /*
367          * CLKCON
368          * SELFREQ[15:8]        : base clock divided by value
369          * ENSDCLK[2]           : SD Clock Enable
370          * STBLINTCLK[1]        : Internal Clock Stable
371          * ENINTCLK[0]          : Internal Clock Enable
372          */
373         div >>= 1;
374         clk = ((div << TEGRA_MMC_CLKCON_SDCLK_FREQ_SEL_SHIFT) |
375                TEGRA_MMC_CLKCON_INTERNAL_CLOCK_ENABLE);
376         writew(clk, &host->reg->clkcon);
377
378         /* Wait max 10 ms */
379         timeout = 10;
380         while (!(readw(&host->reg->clkcon) &
381                  TEGRA_MMC_CLKCON_INTERNAL_CLOCK_STABLE)) {
382                 if (timeout == 0) {
383                         printf("%s: timeout error\n", __func__);
384                         return;
385                 }
386                 timeout--;
387                 udelay(1000);
388         }
389
390         clk |= TEGRA_MMC_CLKCON_SD_CLOCK_ENABLE;
391         writew(clk, &host->reg->clkcon);
392
393         debug("mmc_change_clock: clkcon = %08X\n", clk);
394
395 out:
396         host->clock = clock;
397 }
398
399 static void mmc_set_ios(struct mmc *mmc)
400 {
401         struct mmc_host *host = mmc->priv;
402         unsigned char ctrl;
403         debug(" mmc_set_ios called\n");
404
405         debug("bus_width: %x, clock: %d\n", mmc->bus_width, mmc->clock);
406
407         /* Change clock first */
408         mmc_change_clock(host, mmc->clock);
409
410         ctrl = readb(&host->reg->hostctl);
411
412         /*
413          * WIDE8[5]
414          * 0 = Depend on WIDE4
415          * 1 = 8-bit mode
416          * WIDE4[1]
417          * 1 = 4-bit mode
418          * 0 = 1-bit mode
419          */
420         if (mmc->bus_width == 8)
421                 ctrl |= (1 << 5);
422         else if (mmc->bus_width == 4)
423                 ctrl |= (1 << 1);
424         else
425                 ctrl &= ~(1 << 1);
426
427         writeb(ctrl, &host->reg->hostctl);
428         debug("mmc_set_ios: hostctl = %08X\n", ctrl);
429 }
430
431 static void mmc_reset(struct mmc_host *host, struct mmc *mmc)
432 {
433         unsigned int timeout;
434         debug(" mmc_reset called\n");
435
436         /*
437          * RSTALL[0] : Software reset for all
438          * 1 = reset
439          * 0 = work
440          */
441         writeb(TEGRA_MMC_SWRST_SW_RESET_FOR_ALL, &host->reg->swrst);
442
443         host->clock = 0;
444
445         /* Wait max 100 ms */
446         timeout = 100;
447
448         /* hw clears the bit when it's done */
449         while (readb(&host->reg->swrst) & TEGRA_MMC_SWRST_SW_RESET_FOR_ALL) {
450                 if (timeout == 0) {
451                         printf("%s: timeout error\n", __func__);
452                         return;
453                 }
454                 timeout--;
455                 udelay(1000);
456         }
457
458         /* Set SD bus voltage & enable bus power */
459         mmc_set_power(host, fls(mmc->voltages) - 1);
460         debug("%s: power control = %02X, host control = %02X\n", __func__,
461                 readb(&host->reg->pwrcon), readb(&host->reg->hostctl));
462
463         /* Make sure SDIO pads are set up */
464         pad_init_mmc(host);
465 }
466
467 static int mmc_core_init(struct mmc *mmc)
468 {
469         struct mmc_host *host = (struct mmc_host *)mmc->priv;
470         unsigned int mask;
471         debug(" mmc_core_init called\n");
472
473         mmc_reset(host, mmc);
474
475         host->version = readw(&host->reg->hcver);
476         debug("host version = %x\n", host->version);
477
478         /* mask all */
479         writel(0xffffffff, &host->reg->norintstsen);
480         writel(0xffffffff, &host->reg->norintsigen);
481
482         writeb(0xe, &host->reg->timeoutcon);    /* TMCLK * 2^27 */
483         /*
484          * NORMAL Interrupt Status Enable Register init
485          * [5] ENSTABUFRDRDY : Buffer Read Ready Status Enable
486          * [4] ENSTABUFWTRDY : Buffer write Ready Status Enable
487          * [3] ENSTADMAINT   : DMA boundary interrupt
488          * [1] ENSTASTANSCMPLT : Transfre Complete Status Enable
489          * [0] ENSTACMDCMPLT : Command Complete Status Enable
490         */
491         mask = readl(&host->reg->norintstsen);
492         mask &= ~(0xffff);
493         mask |= (TEGRA_MMC_NORINTSTSEN_CMD_COMPLETE |
494                  TEGRA_MMC_NORINTSTSEN_XFER_COMPLETE |
495                  TEGRA_MMC_NORINTSTSEN_DMA_INTERRUPT |
496                  TEGRA_MMC_NORINTSTSEN_BUFFER_WRITE_READY |
497                  TEGRA_MMC_NORINTSTSEN_BUFFER_READ_READY);
498         writel(mask, &host->reg->norintstsen);
499
500         /*
501          * NORMAL Interrupt Signal Enable Register init
502          * [1] ENSTACMDCMPLT : Transfer Complete Signal Enable
503          */
504         mask = readl(&host->reg->norintsigen);
505         mask &= ~(0xffff);
506         mask |= TEGRA_MMC_NORINTSIGEN_XFER_COMPLETE;
507         writel(mask, &host->reg->norintsigen);
508
509         return 0;
510 }
511
512 int tegra_mmc_getcd(struct mmc *mmc)
513 {
514         struct mmc_host *host = (struct mmc_host *)mmc->priv;
515
516         debug("tegra_mmc_getcd called\n");
517
518         if (fdt_gpio_isvalid(&host->cd_gpio))
519                 return fdtdec_get_gpio(&host->cd_gpio);
520
521         return 1;
522 }
523
524 static int do_mmc_init(int dev_index)
525 {
526         struct mmc_host *host;
527         char gpusage[12]; /* "SD/MMCn PWR" or "SD/MMCn CD" */
528         struct mmc *mmc;
529
530         /* DT should have been read & host config filled in */
531         host = &mmc_host[dev_index];
532         if (!host->enabled)
533                 return -1;
534
535         debug(" do_mmc_init: index %d, bus width %d "
536                 "pwr_gpio %d cd_gpio %d\n",
537                 dev_index, host->width,
538                 host->pwr_gpio.gpio, host->cd_gpio.gpio);
539
540         host->clock = 0;
541         clock_start_periph_pll(host->mmc_id, CLOCK_ID_PERIPH, 20000000);
542
543         if (fdt_gpio_isvalid(&host->pwr_gpio)) {
544                 sprintf(gpusage, "SD/MMC%d PWR", dev_index);
545                 gpio_request(host->pwr_gpio.gpio, gpusage);
546                 gpio_direction_output(host->pwr_gpio.gpio, 1);
547                 debug(" Power GPIO name = %s\n", host->pwr_gpio.name);
548         }
549
550         if (fdt_gpio_isvalid(&host->cd_gpio)) {
551                 sprintf(gpusage, "SD/MMC%d CD", dev_index);
552                 gpio_request(host->cd_gpio.gpio, gpusage);
553                 gpio_direction_input(host->cd_gpio.gpio);
554                 debug(" CD GPIO name = %s\n", host->cd_gpio.name);
555         }
556
557         mmc = &mmc_dev[dev_index];
558
559         sprintf(mmc->name, "Tegra SD/MMC");
560         mmc->priv = host;
561         mmc->send_cmd = mmc_send_cmd;
562         mmc->set_ios = mmc_set_ios;
563         mmc->init = mmc_core_init;
564         mmc->getcd = tegra_mmc_getcd;
565         mmc->getwp = NULL;
566
567         mmc->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
568         mmc->host_caps = 0;
569         if (host->width == 8)
570                 mmc->host_caps |= MMC_MODE_8BIT;
571         if (host->width >= 4)
572                 mmc->host_caps |= MMC_MODE_4BIT;
573         mmc->host_caps |= MMC_MODE_HS_52MHz | MMC_MODE_HS | MMC_MODE_HC;
574
575         /*
576          * min freq is for card identification, and is the highest
577          *  low-speed SDIO card frequency (actually 400KHz)
578          * max freq is highest HS eMMC clock as per the SD/MMC spec
579          *  (actually 52MHz)
580          */
581         mmc->f_min = 375000;
582         mmc->f_max = 48000000;
583
584         mmc_register(mmc);
585
586         return 0;
587 }
588
589 /**
590  * Get the host address and peripheral ID for a node.
591  *
592  * @param blob          fdt blob
593  * @param node          Device index (0-3)
594  * @param host          Structure to fill in (reg, width, mmc_id)
595  */
596 static int mmc_get_config(const void *blob, int node, struct mmc_host *host)
597 {
598         debug("%s: node = %d\n", __func__, node);
599
600         host->enabled = fdtdec_get_is_enabled(blob, node);
601
602         host->reg = (struct tegra_mmc *)fdtdec_get_addr(blob, node, "reg");
603         if ((fdt_addr_t)host->reg == FDT_ADDR_T_NONE) {
604                 debug("%s: no sdmmc base reg info found\n", __func__);
605                 return -FDT_ERR_NOTFOUND;
606         }
607
608         host->mmc_id = clock_decode_periph_id(blob, node);
609         if (host->mmc_id == PERIPH_ID_NONE) {
610                 debug("%s: could not decode periph id\n", __func__);
611                 return -FDT_ERR_NOTFOUND;
612         }
613
614         /*
615          * NOTE: mmc->bus_width is determined by mmc.c dynamically.
616          * TBD: Override it with this value?
617          */
618         host->width = fdtdec_get_int(blob, node, "bus-width", 0);
619         if (!host->width)
620                 debug("%s: no sdmmc width found\n", __func__);
621
622         /* These GPIOs are optional */
623         fdtdec_decode_gpio(blob, node, "cd-gpios", &host->cd_gpio);
624         fdtdec_decode_gpio(blob, node, "wp-gpios", &host->wp_gpio);
625         fdtdec_decode_gpio(blob, node, "power-gpios", &host->pwr_gpio);
626
627         debug("%s: found controller at %p, width = %d, periph_id = %d\n",
628                 __func__, host->reg, host->width, host->mmc_id);
629         return 0;
630 }
631
632 /*
633  * Process a list of nodes, adding them to our list of SDMMC ports.
634  *
635  * @param blob          fdt blob
636  * @param node_list     list of nodes to process (any <=0 are ignored)
637  * @param count         number of nodes to process
638  * @return 0 if ok, -1 on error
639  */
640 static int process_nodes(const void *blob, int node_list[], int count)
641 {
642         struct mmc_host *host;
643         int i, node;
644
645         debug("%s: count = %d\n", __func__, count);
646
647         /* build mmc_host[] for each controller */
648         for (i = 0; i < count; i++) {
649                 node = node_list[i];
650                 if (node <= 0)
651                         continue;
652
653                 host = &mmc_host[i];
654                 host->id = i;
655
656                 if (mmc_get_config(blob, node, host)) {
657                         printf("%s: failed to decode dev %d\n", __func__, i);
658                         return -1;
659                 }
660                 do_mmc_init(i);
661         }
662         return 0;
663 }
664
665 void tegra_mmc_init(void)
666 {
667         int node_list[MAX_HOSTS], count;
668         const void *blob = gd->fdt_blob;
669         debug("%s entry\n", __func__);
670
671         /* See if any Tegra124 MMC controllers are present */
672         count = fdtdec_find_aliases_for_id(blob, "sdhci",
673                 COMPAT_NVIDIA_TEGRA124_SDMMC, node_list, MAX_HOSTS);
674         debug("%s: count of Tegra124 sdhci nodes is %d\n", __func__, count);
675         if (process_nodes(blob, node_list, count)) {
676                 printf("%s: Error processing T30 mmc node(s)!\n", __func__);
677                 return;
678         }
679
680         /* See if any Tegra30 MMC controllers are present */
681         count = fdtdec_find_aliases_for_id(blob, "sdhci",
682                 COMPAT_NVIDIA_TEGRA30_SDMMC, node_list, MAX_HOSTS);
683         debug("%s: count of T30 sdhci nodes is %d\n", __func__, count);
684         if (process_nodes(blob, node_list, count)) {
685                 printf("%s: Error processing T30 mmc node(s)!\n", __func__);
686                 return;
687         }
688
689         /* Now look for any Tegra20 MMC controllers */
690         count = fdtdec_find_aliases_for_id(blob, "sdhci",
691                 COMPAT_NVIDIA_TEGRA20_SDMMC, node_list, MAX_HOSTS);
692         debug("%s: count of T20 sdhci nodes is %d\n", __func__, count);
693         if (process_nodes(blob, node_list, count)) {
694                 printf("%s: Error processing T20 mmc node(s)!\n", __func__);
695                 return;
696         }
697 }