LCOV - code coverage report
Current view: top level - lkbce/drivers/mmc/core - sdio.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 189 280 67.5 %
Date: 2017-01-25 Functions: 8 12 66.7 %

          Line data    Source code
       1             : /*
       2             :  *  linux/drivers/mmc/sdio.c
       3             :  *
       4             :  *  Copyright 2006-2007 Pierre Ossman
       5             :  *
       6             :  * This program is free software; you can redistribute it and/or modify
       7             :  * it under the terms of the GNU General Public License as published by
       8             :  * the Free Software Foundation; either version 2 of the License, or (at
       9             :  * your option) any later version.
      10             :  */
      11             : 
      12             : #include <linux/err.h>
      13             : 
      14             : #include <linux/mmc/host.h>
      15             : #include <linux/mmc/card.h>
      16             : #include <linux/mmc/sdio.h>
      17             : #include <linux/mmc/sdio_func.h>
      18             : 
      19             : #include "core.h"
      20             : #include "bus.h"
      21             : #include "sdio_bus.h"
      22             : #include "mmc_ops.h"
      23             : #include "sd_ops.h"
      24             : #include "sdio_ops.h"
      25             : #include "sdio_cis.h"
      26             : 
      27             : static int sdio_read_fbr(struct sdio_func *func)
      28             : {
      29           0 :         int ret;
      30           0 :         unsigned char data;
      31             : 
      32           0 :         ret = mmc_io_rw_direct(func->card, 0, 0,
      33             :                 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
      34           0 :         if (ret)
      35           0 :                 goto out;
      36             : 
      37           0 :         data &= 0x0f;
      38             : 
      39           0 :         if (data == 0x0f) {
      40           0 :                 ret = mmc_io_rw_direct(func->card, 0, 0,
      41             :                         SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
      42           0 :                 if (ret)
      43           0 :                         goto out;
      44             :         }
      45             : 
      46           0 :         func->class = data;
      47           0 : 
      48             : out:
      49           0 :         return ret;
      50             : }
      51             : 
      52             : static int sdio_init_func(struct mmc_card *card, unsigned int fn)
      53             : {
      54           0 :         int ret;
      55           0 :         struct sdio_func *func;
      56           0 : 
      57           0 :         BUG_ON(fn > SDIO_MAX_FUNCS);
      58           0 : 
      59           0 :         func = sdio_alloc_func(card);
      60           0 :         if (IS_ERR(func))
      61           0 :                 return PTR_ERR(func);
      62             : 
      63           0 :         func->num = fn;
      64             : 
      65           0 :         ret = sdio_read_fbr(func);
      66           0 :         if (ret)
      67           0 :                 goto fail;
      68             : 
      69           0 :         ret = sdio_read_func_cis(func);
      70           0 :         if (ret)
      71           0 :                 goto fail;
      72             : 
      73           0 :         card->sdio_func[fn - 1] = func;
      74             : 
      75           0 :         return 0;
      76           0 : 
      77             : fail:
      78             :         /*
      79             :          * It is okay to remove the function here even though we hold
      80             :          * the host lock as we haven't registered the device yet.
      81             :          */
      82           0 :         sdio_remove_func(func);
      83           0 :         return ret;
      84             : }
      85             : 
      86             : static int sdio_read_cccr(struct mmc_card *card)
      87             : {
      88           3 :         int ret;
      89           3 :         int cccr_vsn;
      90           3 :         unsigned char data;
      91           3 : 
      92           3 :         memset(&card->cccr, 0, sizeof(struct sdio_cccr));
      93             : 
      94           9 :         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
      95           6 :         if (ret)
      96           3 :                 goto out;
      97             : 
      98           3 :         cccr_vsn = data & 0x0f;
      99             : 
     100           6 :         if (cccr_vsn > SDIO_CCCR_REV_1_20) {
     101           9 :                 printk(KERN_ERR "%s: unrecognised CCCR structure version %d\n",
     102             :                         mmc_hostname(card->host), cccr_vsn);
     103           3 :                 return -EINVAL;
     104             :         }
     105             : 
     106           3 :         card->cccr.sdio_vsn = (data & 0xf0) >> 4;
     107             : 
     108           9 :         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
     109           6 :         if (ret)
     110           3 :                 goto out;
     111             : 
     112           6 :         if (data & SDIO_CCCR_CAP_SMB)
     113           3 :                 card->cccr.multi_block = 1;
     114           6 :         if (data & SDIO_CCCR_CAP_LSC)
     115           3 :                 card->cccr.low_speed = 1;
     116           6 :         if (data & SDIO_CCCR_CAP_4BLS)
     117           3 :                 card->cccr.wide_bus = 1;
     118             : 
     119           6 :         if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
     120           9 :                 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
     121           6 :                 if (ret)
     122           3 :                         goto out;
     123             : 
     124           6 :                 if (data & SDIO_POWER_SMPC)
     125           3 :                         card->cccr.high_power = 1;
     126             :         }
     127             : 
     128          12 :         if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
     129          18 :                 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &data);
     130           6 :                 if (ret)
     131           3 :                         goto out;
     132             : 
     133           6 :                 if (data & SDIO_SPEED_SHS)
     134           3 :                         card->cccr.high_speed = 1;
     135             :         }
     136             : 
     137             : out:
     138          12 :         return ret;
     139             : }
     140             : 
     141           9 : static int sdio_enable_wide(struct mmc_card *card)
     142             : {
     143           2 :         int ret;
     144           2 :         u8 ctrl;
     145             : 
     146           4 :         if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
     147           2 :                 return 0;
     148             : 
     149           4 :         if (card->cccr.low_speed && !card->cccr.wide_bus)
     150           2 :                 return 0;
     151             : 
     152           6 :         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
     153           4 :         if (ret)
     154           2 :                 return ret;
     155             : 
     156           2 :         ctrl |= SDIO_BUS_WIDTH_4BIT;
     157             : 
     158           6 :         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
     159           4 :         if (ret)
     160           2 :                 return ret;
     161             : 
     162           4 :         mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
     163             : 
     164           2 :         return 0;
     165             : }
     166             : 
     167             : /*
     168             :  * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
     169             :  * of the card. This may be required on certain setups of boards,
     170             :  * controllers and embedded sdio device which do not need the card's
     171             :  * pull-up. As a result, card detection is disabled and power is saved.
     172             :  */
     173             : static int sdio_disable_cd(struct mmc_card *card)
     174             : {
     175           0 :         int ret;
     176           0 :         u8 ctrl;
     177           0 : 
     178           0 :         if (!card->cccr.disable_cd)
     179           0 :                 return 0;
     180             : 
     181           0 :         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
     182           0 :         if (ret)
     183           0 :                 return ret;
     184             : 
     185           0 :         ctrl |= SDIO_BUS_CD_DISABLE;
     186             : 
     187           0 :         return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
     188             : }
     189             : 
     190             : /*
     191             :  * Test if the card supports high-speed mode and, if so, switch to it.
     192             :  */
     193             : static int sdio_enable_hs(struct mmc_card *card)
     194             : {
     195           1 :         int ret;
     196           1 :         u8 speed;
     197             : 
     198           2 :         if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
     199           1 :                 return 0;
     200             : 
     201           2 :         if (!card->cccr.high_speed)
     202           1 :                 return 0;
     203             : 
     204           3 :         ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
     205           2 :         if (ret)
     206           1 :                 return ret;
     207             : 
     208           1 :         speed |= SDIO_SPEED_EHS;
     209             : 
     210           3 :         ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
     211           2 :         if (ret)
     212           1 :                 return ret;
     213             : 
     214           1 :         mmc_card_set_highspeed(card);
     215           2 :         mmc_set_timing(card->host, MMC_TIMING_SD_HS);
     216             : 
     217           1 :         return 0;
     218             : }
     219             : 
     220             : /*
     221             :  * Handle the detection and initialisation of a card.
     222             :  *
     223             :  * In the case of a resume, "oldcard" will contain the card
     224             :  * we're trying to reinitialise.
     225             :  */
     226             : static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
     227             :                               struct mmc_card *oldcard)
     228           1 : {
     229           1 :         struct mmc_card *card;
     230           1 :         int err;
     231           1 : 
     232           7 :         BUG_ON(!host);
     233           9 :         WARN_ON(!host->claimed);
     234           1 : 
     235           1 :         /*
     236             :          * Inform the card of the voltage
     237             :          */
     238           3 :         err = mmc_send_io_op_cond(host, host->ocr, &ocr);
     239           2 :         if (err)
     240           1 :                 goto err;
     241             : 
     242             :         /*
     243             :          * For SPI, enable CRC as appropriate.
     244             :          */
     245           2 :         if (mmc_host_is_spi(host)) {
     246           2 :                 err = mmc_spi_set_crc(host, use_spi_crc);
     247           2 :                 if (err)
     248           1 :                         goto err;
     249             :         }
     250             : 
     251             :         /*
     252             :          * Allocate card structure.
     253             :          */
     254           6 :         card = mmc_alloc_card(host, NULL);
     255           4 :         if (IS_ERR(card)) {
     256           3 :                 err = PTR_ERR(card);
     257           1 :                 goto err;
     258             :         }
     259             : 
     260           1 :         card->type = MMC_TYPE_SDIO;
     261             : 
     262             :         /*
     263             :          * For native busses:  set card RCA and quit open drain mode.
     264             :          */
     265           2 :         if (!mmc_host_is_spi(host)) {
     266           2 :                 err = mmc_send_relative_addr(host, &card->rca);
     267           2 :                 if (err)
     268           1 :                         goto remove;
     269             : 
     270             :                 /*
     271             :                  * Update oldcard with the new RCA received from the SDIO
     272             :                  * device -- we're doing this so that it's updated in the
     273             :                  * "card" struct when oldcard overwrites that later.
     274             :                  */
     275           2 :                 if (oldcard)
     276           1 :                         oldcard->rca = card->rca;
     277             : 
     278           2 :                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
     279             :         }
     280             : 
     281             :         /*
     282             :          * Select card, as all following commands rely on that.
     283             :          */
     284           4 :         if (!mmc_host_is_spi(host)) {
     285           4 :                 err = mmc_select_card(card);
     286           2 :                 if (err)
     287           1 :                         goto remove;
     288             :         }
     289             : 
     290             :         /*
     291             :          * Read the common registers.
     292             :          */
     293          18 :         err = sdio_read_cccr(card);
     294           2 :         if (err)
     295           1 :                 goto remove;
     296             : 
     297             :         /*
     298             :          * Read the common CIS tuples.
     299             :          */
     300           2 :         err = sdio_read_common_cis(card);
     301           2 :         if (err)
     302           1 :                 goto remove;
     303             : 
     304           2 :         if (oldcard) {
     305           1 :                 int same = (card->cis.vendor == oldcard->cis.vendor &&
     306             :                             card->cis.device == oldcard->cis.device);
     307           4 :                 mmc_remove_card(card);
     308           2 :                 if (!same) {
     309           1 :                         err = -ENOENT;
     310           1 :                         goto err;
     311             :                 }
     312           1 :                 card = oldcard;
     313           1 :                 return 0;
     314             :         }
     315             : 
     316             :         /*
     317             :          * Switch to high-speed (if supported).
     318             :          */
     319           5 :         err = sdio_enable_hs(card);
     320           2 :         if (err)
     321           1 :                 goto remove;
     322             : 
     323             :         /*
     324             :          * Change to the card's maximum speed.
     325             :          */
     326           2 :         if (mmc_card_highspeed(card)) {
     327             :                 /*
     328             :                  * The SDIO specification doesn't mention how
     329             :                  * the CIS transfer speed register relates to
     330             :                  * high-speed, but it seems that 50 MHz is
     331             :                  * mandatory.
     332             :                  */
     333           2 :                 mmc_set_clock(host, 50000000);
     334             :         } else {
     335           2 :                 mmc_set_clock(host, card->cis.max_dtr);
     336             :         }
     337             : 
     338             :         /*
     339             :          * Switch to wider bus (if supported).
     340             :          */
     341          10 :         err = sdio_enable_wide(card);
     342           2 :         if (err)
     343           1 :                 goto remove;
     344             : 
     345           2 :         if (!oldcard)
     346           1 :                 host->card = card;
     347           1 :         return 0;
     348           6 : 
     349             : remove:
     350          12 :         if (!oldcard)
     351          24 :                 mmc_remove_card(card);
     352             : 
     353             : err:
     354          11 :         return err;
     355             : }
     356           7 : 
     357             : /*
     358             :  * Host is being removed. Free up the current card.
     359             :  */
     360             : static void mmc_sdio_remove(struct mmc_host *host)
     361             : {
     362           2 :         int i;
     363           2 : 
     364          14 :         BUG_ON(!host);
     365          14 :         BUG_ON(!host->card);
     366             : 
     367          12 :         for (i = 0;i < host->card->sdio_funcs;i++) {
     368          10 :                 if (host->card->sdio_func[i]) {
     369           6 :                         sdio_remove_func(host->card->sdio_func[i]);
     370           2 :                         host->card->sdio_func[i] = NULL;
     371             :                 }
     372             :         }
     373             : 
     374           8 :         mmc_remove_card(host->card);
     375           2 :         host->card = NULL;
     376           2 : }
     377             : 
     378             : /*
     379             :  * Card detection callback from host.
     380             :  */
     381             : static void mmc_sdio_detect(struct mmc_host *host)
     382             : {
     383           1 :         int err;
     384           1 : 
     385           7 :         BUG_ON(!host);
     386           7 :         BUG_ON(!host->card);
     387             : 
     388           2 :         mmc_claim_host(host);
     389             : 
     390             :         /*
     391             :          * Just check if our card has been removed.
     392             :          */
     393           2 :         err = mmc_select_card(host->card);
     394             : 
     395           2 :         mmc_release_host(host);
     396             : 
     397           2 :         if (err) {
     398           2 :                 mmc_sdio_remove(host);
     399             : 
     400           2 :                 mmc_claim_host(host);
     401           2 :                 mmc_detach_bus(host);
     402           2 :                 mmc_release_host(host);
     403             :         }
     404           2 : }
     405             : 
     406             : /*
     407             :  * SDIO suspend.  We need to suspend all functions separately.
     408             :  * Therefore all registered functions must have drivers with suspend
     409             :  * and resume methods.  Failing that we simply remove the whole card.
     410             :  */
     411             : static int mmc_sdio_suspend(struct mmc_host *host)
     412             : {
     413           2 :         int i, err = 0;
     414           1 : 
     415           6 :         for (i = 0; i < host->card->sdio_funcs; i++) {
     416           4 :                 struct sdio_func *func = host->card->sdio_func[i];
     417           9 :                 if (func && sdio_func_present(func) && func->dev.driver) {
     418           2 :                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
     419           8 :                         if (!pmops || !pmops->suspend || !pmops->resume) {
     420             :                                 /* force removal of entire card in that case */
     421           2 :                                 err = -ENOSYS;
     422             :                         } else
     423           7 :                                 err = pmops->suspend(&func->dev);
     424           2 :                         if (err)
     425           1 :                                 break;
     426             :                 }
     427             :         }
     428           6 :         while (err && --i >= 0) {
     429           2 :                 struct sdio_func *func = host->card->sdio_func[i];
     430           8 :                 if (func && sdio_func_present(func) && func->dev.driver) {
     431           1 :                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
     432           7 :                         pmops->resume(&func->dev);
     433           1 :                 }
     434             :         }
     435             : 
     436           1 :         return err;
     437           1 : }
     438           1 : 
     439             : static int mmc_sdio_resume(struct mmc_host *host)
     440             : {
     441           1 :         int i, err;
     442           1 : 
     443           7 :         BUG_ON(!host);
     444           8 :         BUG_ON(!host->card);
     445           1 : 
     446           1 :         /* Basic card reinitialization. */
     447           2 :         mmc_claim_host(host);
     448          12 :         err = mmc_sdio_init_card(host, host->ocr, host->card);
     449           2 :         mmc_release_host(host);
     450             : 
     451             :         /*
     452             :          * If the card looked to be the same as before suspending, then
     453             :          * we proceed to resume all card functions.  If one of them returns
     454             :          * an error then we simply return that error to the core and the
     455             :          * card will be redetected as new.  It is the responsibility of
     456             :          * the function driver to perform further tests with the extra
     457             :          * knowledge it has of the card to confirm the card is indeed the
     458             :          * same as before suspending (same MAC address for network cards,
     459             :          * etc.) and return an error otherwise.
     460             :          */
     461           7 :         for (i = 0; !err && i < host->card->sdio_funcs; i++) {
     462           3 :                 struct sdio_func *func = host->card->sdio_func[i];
     463           8 :                 if (func && sdio_func_present(func) && func->dev.driver) {
     464           1 :                         const struct dev_pm_ops *pmops = func->dev.driver->pm;
     465           7 :                         err = pmops->resume(&func->dev);
     466             :                 }
     467             :         }
     468             : 
     469           1 :         return err;
     470             : }
     471             : 
     472           1 : static const struct mmc_bus_ops mmc_sdio_ops = {
     473             :         .remove = mmc_sdio_remove,
     474             :         .detect = mmc_sdio_detect,
     475             :         .suspend = mmc_sdio_suspend,
     476             :         .resume = mmc_sdio_resume,
     477             : };
     478             : 
     479             : 
     480             : /*
     481             :  * Starting point for SDIO card init.
     482             :  */
     483             : int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
     484             : {
     485           0 :         int err;
     486           0 :         int i, funcs;
     487           0 :         struct mmc_card *card;
     488           0 : 
     489           0 :         BUG_ON(!host);
     490           0 :         WARN_ON(!host->claimed);
     491           0 : 
     492           0 :         mmc_attach_bus(host, &mmc_sdio_ops);
     493           0 : 
     494             :         /*
     495             :          * Sanity check the voltages that the card claims to
     496             :          * support.
     497             :          */
     498           0 :         if (ocr & 0x7F) {
     499           0 :                 printk(KERN_WARNING "%s: card claims to support voltages "
     500             :                        "below the defined range. These will be ignored.\n",
     501             :                        mmc_hostname(host));
     502           0 :                 ocr &= ~0x7F;
     503             :         }
     504             : 
     505           0 :         host->ocr = mmc_select_voltage(host, ocr);
     506             : 
     507             :         /*
     508             :          * Can we support the voltage(s) of the card(s)?
     509             :          */
     510           0 :         if (!host->ocr) {
     511           0 :                 err = -EINVAL;
     512           0 :                 goto err;
     513             :         }
     514             : 
     515             :         /*
     516             :          * Detect and init the card.
     517             :          */
     518           0 :         err = mmc_sdio_init_card(host, host->ocr, NULL);
     519           0 :         if (err)
     520           0 :                 goto err;
     521           0 :         card = host->card;
     522             : 
     523             :         /*
     524             :          * The number of functions on the card is encoded inside
     525             :          * the ocr.
     526             :          */
     527           0 :         funcs = (ocr & 0x70000000) >> 28;
     528           0 :         card->sdio_funcs = 0;
     529             : 
     530             :         /*
     531             :          * If needed, disconnect card detection pull-up resistor.
     532             :          */
     533           0 :         err = sdio_disable_cd(card);
     534           0 :         if (err)
     535           0 :                 goto remove;
     536             : 
     537             :         /*
     538             :          * Initialize (but don't add) all present functions.
     539             :          */
     540           0 :         for (i = 0; i < funcs; i++, card->sdio_funcs++) {
     541           0 :                 err = sdio_init_func(host->card, i + 1);
     542           0 :                 if (err)
     543           0 :                         goto remove;
     544             :         }
     545             : 
     546           0 :         mmc_release_host(host);
     547             : 
     548             :         /*
     549             :          * First add the card to the driver model...
     550             :          */
     551           0 :         err = mmc_add_card(host->card);
     552           0 :         if (err)
     553           0 :                 goto remove_added;
     554             : 
     555             :         /*
     556             :          * ...then the SDIO functions.
     557             :          */
     558           0 :         for (i = 0;i < funcs;i++) {
     559           0 :                 err = sdio_add_func(host->card->sdio_func[i]);
     560           0 :                 if (err)
     561           0 :                         goto remove_added;
     562             :         }
     563             : 
     564           0 :         return 0;
     565           0 : 
     566             : 
     567             : remove_added:
     568             :         /* Remove without lock if the device has been added. */
     569           0 :         mmc_sdio_remove(host);
     570           0 :         mmc_claim_host(host);
     571             : remove:
     572           0 :         /* And with lock if it hasn't been added. */
     573           0 :         if (host->card)
     574           0 :                 mmc_sdio_remove(host);
     575             : err:
     576           0 :         mmc_detach_bus(host);
     577           0 :         mmc_release_host(host);
     578             : 
     579           0 :         printk(KERN_ERR "%s: error %d whilst initialising SDIO card\n",
     580             :                 mmc_hostname(host), err);
     581             : 
     582           0 :         return err;
     583             : }
     584             : 

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