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path: root/drivers/mmc/core/mmc.c
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Diffstat (limited to 'drivers/mmc/core/mmc.c')
-rw-r--r--drivers/mmc/core/mmc.c430
1 files changed, 430 insertions, 0 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
new file mode 100644
index 00000000000..c528017d612
--- /dev/null
+++ b/drivers/mmc/core/mmc.c
@@ -0,0 +1,430 @@
+/*
+ * linux/drivers/mmc/mmc.c
+ *
+ * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
+ * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
+ * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/err.h>
+
+#include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/mmc.h>
+
+#include "core.h"
+#include "sysfs.h"
+#include "mmc_ops.h"
+
+static const unsigned int tran_exp[] = {
+ 10000, 100000, 1000000, 10000000,
+ 0, 0, 0, 0
+};
+
+static const unsigned char tran_mant[] = {
+ 0, 10, 12, 13, 15, 20, 25, 30,
+ 35, 40, 45, 50, 55, 60, 70, 80,
+};
+
+static const unsigned int tacc_exp[] = {
+ 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
+};
+
+static const unsigned int tacc_mant[] = {
+ 0, 10, 12, 13, 15, 20, 25, 30,
+ 35, 40, 45, 50, 55, 60, 70, 80,
+};
+
+#define UNSTUFF_BITS(resp,start,size) \
+ ({ \
+ const int __size = size; \
+ const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
+ const int __off = 3 - ((start) / 32); \
+ const int __shft = (start) & 31; \
+ u32 __res; \
+ \
+ __res = resp[__off] >> __shft; \
+ if (__size + __shft > 32) \
+ __res |= resp[__off-1] << ((32 - __shft) % 32); \
+ __res & __mask; \
+ })
+
+/*
+ * Given the decoded CSD structure, decode the raw CID to our CID structure.
+ */
+static void mmc_decode_cid(struct mmc_card *card)
+{
+ u32 *resp = card->raw_cid;
+
+ /*
+ * The selection of the format here is based upon published
+ * specs from sandisk and from what people have reported.
+ */
+ switch (card->csd.mmca_vsn) {
+ case 0: /* MMC v1.0 - v1.2 */
+ case 1: /* MMC v1.4 */
+ card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
+ card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
+ card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
+ card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
+ card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
+ card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
+ card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
+ card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
+ card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
+ card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
+ card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
+ card->cid.month = UNSTUFF_BITS(resp, 12, 4);
+ card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
+ break;
+
+ case 2: /* MMC v2.0 - v2.2 */
+ case 3: /* MMC v3.1 - v3.3 */
+ case 4: /* MMC v4 */
+ card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
+ card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
+ card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
+ card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
+ card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
+ card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
+ card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
+ card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
+ card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
+ card->cid.month = UNSTUFF_BITS(resp, 12, 4);
+ card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
+ break;
+
+ default:
+ printk("%s: card has unknown MMCA version %d\n",
+ mmc_hostname(card->host), card->csd.mmca_vsn);
+ mmc_card_set_bad(card);
+ break;
+ }
+}
+
+/*
+ * Given a 128-bit response, decode to our card CSD structure.
+ */
+static void mmc_decode_csd(struct mmc_card *card)
+{
+ struct mmc_csd *csd = &card->csd;
+ unsigned int e, m, csd_struct;
+ u32 *resp = card->raw_csd;
+
+ /*
+ * We only understand CSD structure v1.1 and v1.2.
+ * v1.2 has extra information in bits 15, 11 and 10.
+ */
+ csd_struct = UNSTUFF_BITS(resp, 126, 2);
+ if (csd_struct != 1 && csd_struct != 2) {
+ printk("%s: unrecognised CSD structure version %d\n",
+ mmc_hostname(card->host), csd_struct);
+ mmc_card_set_bad(card);
+ return;
+ }
+
+ csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
+ m = UNSTUFF_BITS(resp, 115, 4);
+ e = UNSTUFF_BITS(resp, 112, 3);
+ csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
+ csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
+
+ m = UNSTUFF_BITS(resp, 99, 4);
+ e = UNSTUFF_BITS(resp, 96, 3);
+ csd->max_dtr = tran_exp[e] * tran_mant[m];
+ csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
+
+ e = UNSTUFF_BITS(resp, 47, 3);
+ m = UNSTUFF_BITS(resp, 62, 12);
+ csd->capacity = (1 + m) << (e + 2);
+
+ csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
+ csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
+ csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
+ csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
+ csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
+ csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
+ csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
+}
+
+/*
+ * Read and decode extended CSD. Switch to high-speed and wide bus
+ * if supported.
+ */
+static int mmc_process_ext_csd(struct mmc_card *card)
+{
+ int err;
+ u8 *ext_csd;
+
+ BUG_ON(!card);
+
+ err = MMC_ERR_FAILED;
+
+ if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
+ return MMC_ERR_NONE;
+
+ /*
+ * As the ext_csd is so large and mostly unused, we don't store the
+ * raw block in mmc_card.
+ */
+ ext_csd = kmalloc(512, GFP_KERNEL);
+ if (!ext_csd) {
+ printk(KERN_ERR "%s: could not allocate a buffer to "
+ "receive the ext_csd. mmc v4 cards will be "
+ "treated as v3.\n", mmc_hostname(card->host));
+ return MMC_ERR_FAILED;
+ }
+
+ err = mmc_send_ext_csd(card, ext_csd);
+ if (err != MMC_ERR_NONE) {
+ /*
+ * High capacity cards should have this "magic" size
+ * stored in their CSD.
+ */
+ if (card->csd.capacity == (4096 * 512)) {
+ printk(KERN_ERR "%s: unable to read EXT_CSD "
+ "on a possible high capacity card. "
+ "Card will be ignored.\n",
+ mmc_hostname(card->host));
+ } else {
+ printk(KERN_WARNING "%s: unable to read "
+ "EXT_CSD, performance might "
+ "suffer.\n",
+ mmc_hostname(card->host));
+ err = MMC_ERR_NONE;
+ }
+ goto out;
+ }
+
+ card->ext_csd.sectors =
+ ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
+ ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
+ ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
+ ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
+ if (card->ext_csd.sectors)
+ mmc_card_set_blockaddr(card);
+
+ switch (ext_csd[EXT_CSD_CARD_TYPE]) {
+ case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
+ card->ext_csd.hs_max_dtr = 52000000;
+ break;
+ case EXT_CSD_CARD_TYPE_26:
+ card->ext_csd.hs_max_dtr = 26000000;
+ break;
+ default:
+ /* MMC v4 spec says this cannot happen */
+ printk(KERN_WARNING "%s: card is mmc v4 but doesn't "
+ "support any high-speed modes.\n",
+ mmc_hostname(card->host));
+ goto out;
+ }
+
+ if (card->host->caps & MMC_CAP_MMC_HIGHSPEED) {
+ /* Activate highspeed support. */
+ err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+ EXT_CSD_HS_TIMING, 1);
+ if (err != MMC_ERR_NONE) {
+ printk(KERN_WARNING "%s: failed to switch "
+ "card to mmc v4 high-speed mode.\n",
+ mmc_hostname(card->host));
+ err = MMC_ERR_NONE;
+ goto out;
+ }
+
+ mmc_card_set_highspeed(card);
+
+ mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
+ }
+
+ /* Check for host support for wide-bus modes. */
+ if (card->host->caps & MMC_CAP_4_BIT_DATA) {
+ /* Activate 4-bit support. */
+ err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+ EXT_CSD_BUS_WIDTH, EXT_CSD_BUS_WIDTH_4);
+ if (err != MMC_ERR_NONE) {
+ printk(KERN_WARNING "%s: failed to switch "
+ "card to mmc v4 4-bit bus mode.\n",
+ mmc_hostname(card->host));
+ err = MMC_ERR_NONE;
+ goto out;
+ }
+
+ mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
+ }
+
+out:
+ kfree(ext_csd);
+
+ return err;
+}
+
+/*
+ * Host is being removed. Free up the current card.
+ */
+static void mmc_remove(struct mmc_host *host)
+{
+ BUG_ON(!host);
+ BUG_ON(!host->card);
+
+ mmc_remove_card(host->card);
+ host->card = NULL;
+}
+
+/*
+ * Card detection callback from host.
+ */
+static void mmc_detect(struct mmc_host *host)
+{
+ int err;
+
+ BUG_ON(!host);
+ BUG_ON(!host->card);
+
+ mmc_claim_host(host);
+
+ /*
+ * Just check if our card has been removed.
+ */
+ err = mmc_send_status(host->card, NULL);
+
+ mmc_release_host(host);
+
+ if (err != MMC_ERR_NONE) {
+ mmc_remove_card(host->card);
+ host->card = NULL;
+
+ mmc_claim_host(host);
+ mmc_detach_bus(host);
+ mmc_release_host(host);
+ }
+}
+
+static const struct mmc_bus_ops mmc_ops = {
+ .remove = mmc_remove,
+ .detect = mmc_detect,
+};
+
+/*
+ * Starting point for MMC card init.
+ */
+int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
+{
+ struct mmc_card *card;
+ int err;
+ u32 cid[4];
+ unsigned int max_dtr;
+
+ BUG_ON(!host);
+ BUG_ON(!host->claimed);
+
+ mmc_attach_bus(host, &mmc_ops);
+
+ host->ocr = mmc_select_voltage(host, ocr);
+
+ /*
+ * Can we support the voltage of the card?
+ */
+ if (!host->ocr)
+ goto err;
+
+ /*
+ * Since we're changing the OCR value, we seem to
+ * need to tell some cards to go back to the idle
+ * state. We wait 1ms to give cards time to
+ * respond.
+ */
+ mmc_go_idle(host);
+
+ /* The extra bit indicates that we support high capacity */
+ mmc_send_op_cond(host, host->ocr | (1 << 30), NULL);
+
+ /*
+ * Fetch CID from card.
+ */
+ err = mmc_all_send_cid(host, cid);
+ if (err != MMC_ERR_NONE)
+ goto err;
+
+ /*
+ * Allocate card structure.
+ */
+ card = mmc_alloc_card(host);
+ if (IS_ERR(card))
+ goto err;
+
+ card->type = MMC_TYPE_MMC;
+ card->rca = 1;
+ memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
+
+ /*
+ * Set card RCA.
+ */
+ err = mmc_set_relative_addr(card);
+ if (err != MMC_ERR_NONE)
+ goto free_card;
+
+ mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
+
+ /*
+ * Fetch CSD from card.
+ */
+ err = mmc_send_csd(card, card->raw_csd);
+ if (err != MMC_ERR_NONE)
+ goto free_card;
+
+ mmc_decode_csd(card);
+ mmc_decode_cid(card);
+
+ /*
+ * Fetch and process extened CSD.
+ * This will switch into high-speed and wide bus modes,
+ * as available.
+ */
+ err = mmc_select_card(card);
+ if (err != MMC_ERR_NONE)
+ goto free_card;
+
+ err = mmc_process_ext_csd(card);
+ if (err != MMC_ERR_NONE)
+ goto free_card;
+
+ /*
+ * Compute bus speed.
+ */
+ max_dtr = (unsigned int)-1;
+
+ if (mmc_card_highspeed(card)) {
+ if (max_dtr > card->ext_csd.hs_max_dtr)
+ max_dtr = card->ext_csd.hs_max_dtr;
+ } else if (max_dtr > card->csd.max_dtr) {
+ max_dtr = card->csd.max_dtr;
+ }
+
+ mmc_set_clock(host, max_dtr);
+
+ host->card = card;
+
+ mmc_release_host(host);
+
+ err = mmc_register_card(card);
+ if (err)
+ goto reclaim_host;
+
+ return 0;
+
+reclaim_host:
+ mmc_claim_host(host);
+free_card:
+ mmc_remove_card(card);
+ host->card = NULL;
+err:
+ mmc_detach_bus(host);
+ mmc_release_host(host);
+
+ return 0;
+}
+