Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
new file mode 100644
index 0000000..e4002632
--- /dev/null
+++ b/drivers/mmc/mmc.c
@@ -0,0 +1,914 @@
+/*
+ * linux/drivers/mmc/mmc.c
+ *
+ * Copyright (C) 2003-2004 Russell King, 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/config.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/completion.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/pagemap.h>
+#include <linux/err.h>
+
+#include <linux/mmc/card.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/protocol.h>
+
+#include "mmc.h"
+
+#ifdef CONFIG_MMC_DEBUG
+#define DBG(x...) printk(KERN_DEBUG x)
+#else
+#define DBG(x...) do { } while (0)
+#endif
+
+#define CMD_RETRIES 3
+
+/*
+ * OCR Bit positions to 10s of Vdd mV.
+ */
+static const unsigned short mmc_ocr_bit_to_vdd[] = {
+ 150, 155, 160, 165, 170, 180, 190, 200,
+ 210, 220, 230, 240, 250, 260, 270, 280,
+ 290, 300, 310, 320, 330, 340, 350, 360
+};
+
+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,
+};
+
+
+/**
+ * mmc_request_done - finish processing an MMC command
+ * @host: MMC host which completed command
+ * @mrq: MMC request which completed
+ *
+ * MMC drivers should call this function when they have completed
+ * their processing of a command. This should be called before the
+ * data part of the command has completed.
+ */
+void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
+{
+ struct mmc_command *cmd = mrq->cmd;
+ int err = mrq->cmd->error;
+ DBG("MMC: req done (%02x): %d: %08x %08x %08x %08x\n", cmd->opcode,
+ err, cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3]);
+
+ if (err && cmd->retries) {
+ cmd->retries--;
+ cmd->error = 0;
+ host->ops->request(host, mrq);
+ } else if (mrq->done) {
+ mrq->done(mrq);
+ }
+}
+
+EXPORT_SYMBOL(mmc_request_done);
+
+/**
+ * mmc_start_request - start a command on a host
+ * @host: MMC host to start command on
+ * @mrq: MMC request to start
+ *
+ * Queue a command on the specified host. We expect the
+ * caller to be holding the host lock with interrupts disabled.
+ */
+void
+mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
+{
+ DBG("MMC: starting cmd %02x arg %08x flags %08x\n",
+ mrq->cmd->opcode, mrq->cmd->arg, mrq->cmd->flags);
+
+ WARN_ON(host->card_busy == NULL);
+
+ mrq->cmd->error = 0;
+ mrq->cmd->mrq = mrq;
+ if (mrq->data) {
+ mrq->cmd->data = mrq->data;
+ mrq->data->error = 0;
+ mrq->data->mrq = mrq;
+ if (mrq->stop) {
+ mrq->data->stop = mrq->stop;
+ mrq->stop->error = 0;
+ mrq->stop->mrq = mrq;
+ }
+ }
+ host->ops->request(host, mrq);
+}
+
+EXPORT_SYMBOL(mmc_start_request);
+
+static void mmc_wait_done(struct mmc_request *mrq)
+{
+ complete(mrq->done_data);
+}
+
+int mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
+{
+ DECLARE_COMPLETION(complete);
+
+ mrq->done_data = &complete;
+ mrq->done = mmc_wait_done;
+
+ mmc_start_request(host, mrq);
+
+ wait_for_completion(&complete);
+
+ return 0;
+}
+
+EXPORT_SYMBOL(mmc_wait_for_req);
+
+/**
+ * mmc_wait_for_cmd - start a command and wait for completion
+ * @host: MMC host to start command
+ * @cmd: MMC command to start
+ * @retries: maximum number of retries
+ *
+ * Start a new MMC command for a host, and wait for the command
+ * to complete. Return any error that occurred while the command
+ * was executing. Do not attempt to parse the response.
+ */
+int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
+{
+ struct mmc_request mrq;
+
+ BUG_ON(host->card_busy == NULL);
+
+ memset(&mrq, 0, sizeof(struct mmc_request));
+
+ memset(cmd->resp, 0, sizeof(cmd->resp));
+ cmd->retries = retries;
+
+ mrq.cmd = cmd;
+ cmd->data = NULL;
+
+ mmc_wait_for_req(host, &mrq);
+
+ return cmd->error;
+}
+
+EXPORT_SYMBOL(mmc_wait_for_cmd);
+
+
+
+/**
+ * __mmc_claim_host - exclusively claim a host
+ * @host: mmc host to claim
+ * @card: mmc card to claim host for
+ *
+ * Claim a host for a set of operations. If a valid card
+ * is passed and this wasn't the last card selected, select
+ * the card before returning.
+ *
+ * Note: you should use mmc_card_claim_host or mmc_claim_host.
+ */
+int __mmc_claim_host(struct mmc_host *host, struct mmc_card *card)
+{
+ DECLARE_WAITQUEUE(wait, current);
+ unsigned long flags;
+ int err = 0;
+
+ add_wait_queue(&host->wq, &wait);
+ spin_lock_irqsave(&host->lock, flags);
+ while (1) {
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ if (host->card_busy == NULL)
+ break;
+ spin_unlock_irqrestore(&host->lock, flags);
+ schedule();
+ spin_lock_irqsave(&host->lock, flags);
+ }
+ set_current_state(TASK_RUNNING);
+ host->card_busy = card;
+ spin_unlock_irqrestore(&host->lock, flags);
+ remove_wait_queue(&host->wq, &wait);
+
+ if (card != (void *)-1 && host->card_selected != card) {
+ struct mmc_command cmd;
+
+ host->card_selected = card;
+
+ cmd.opcode = MMC_SELECT_CARD;
+ cmd.arg = card->rca << 16;
+ cmd.flags = MMC_RSP_R1;
+
+ err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
+ }
+
+ return err;
+}
+
+EXPORT_SYMBOL(__mmc_claim_host);
+
+/**
+ * mmc_release_host - release a host
+ * @host: mmc host to release
+ *
+ * Release a MMC host, allowing others to claim the host
+ * for their operations.
+ */
+void mmc_release_host(struct mmc_host *host)
+{
+ unsigned long flags;
+
+ BUG_ON(host->card_busy == NULL);
+
+ spin_lock_irqsave(&host->lock, flags);
+ host->card_busy = NULL;
+ spin_unlock_irqrestore(&host->lock, flags);
+
+ wake_up(&host->wq);
+}
+
+EXPORT_SYMBOL(mmc_release_host);
+
+/*
+ * Ensure that no card is selected.
+ */
+static void mmc_deselect_cards(struct mmc_host *host)
+{
+ struct mmc_command cmd;
+
+ if (host->card_selected) {
+ host->card_selected = NULL;
+
+ cmd.opcode = MMC_SELECT_CARD;
+ cmd.arg = 0;
+ cmd.flags = MMC_RSP_NONE;
+
+ mmc_wait_for_cmd(host, &cmd, 0);
+ }
+}
+
+
+static inline void mmc_delay(unsigned int ms)
+{
+ if (ms < HZ / 1000) {
+ yield();
+ mdelay(ms);
+ } else {
+ msleep_interruptible (ms);
+ }
+}
+
+/*
+ * Mask off any voltages we don't support and select
+ * the lowest voltage
+ */
+static u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
+{
+ int bit;
+
+ ocr &= host->ocr_avail;
+
+ bit = ffs(ocr);
+ if (bit) {
+ bit -= 1;
+
+ ocr = 3 << bit;
+
+ host->ios.vdd = bit;
+ host->ops->set_ios(host, &host->ios);
+ } else {
+ ocr = 0;
+ }
+
+ return ocr;
+}
+
+#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;
+
+ memset(&card->cid, 0, sizeof(struct mmc_cid));
+
+ /*
+ * The selection of the format here is guesswork based upon
+ * information people have sent to date.
+ */
+ switch (card->csd.mmca_vsn) {
+ case 0: /* MMC v1.? */
+ 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.x ? */
+ case 3: /* MMC v3.x ? */
+ 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",
+ card->host->host_name, 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 v2.
+ * v2 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",
+ card->host->host_name, 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);
+}
+
+/*
+ * Locate a MMC card on this MMC host given a raw CID.
+ */
+static struct mmc_card *mmc_find_card(struct mmc_host *host, u32 *raw_cid)
+{
+ struct mmc_card *card;
+
+ list_for_each_entry(card, &host->cards, node) {
+ if (memcmp(card->raw_cid, raw_cid, sizeof(card->raw_cid)) == 0)
+ return card;
+ }
+ return NULL;
+}
+
+/*
+ * Allocate a new MMC card, and assign a unique RCA.
+ */
+static struct mmc_card *
+mmc_alloc_card(struct mmc_host *host, u32 *raw_cid, unsigned int *frca)
+{
+ struct mmc_card *card, *c;
+ unsigned int rca = *frca;
+
+ card = kmalloc(sizeof(struct mmc_card), GFP_KERNEL);
+ if (!card)
+ return ERR_PTR(-ENOMEM);
+
+ mmc_init_card(card, host);
+ memcpy(card->raw_cid, raw_cid, sizeof(card->raw_cid));
+
+ again:
+ list_for_each_entry(c, &host->cards, node)
+ if (c->rca == rca) {
+ rca++;
+ goto again;
+ }
+
+ card->rca = rca;
+
+ *frca = rca;
+
+ return card;
+}
+
+/*
+ * Tell attached cards to go to IDLE state
+ */
+static void mmc_idle_cards(struct mmc_host *host)
+{
+ struct mmc_command cmd;
+
+ cmd.opcode = MMC_GO_IDLE_STATE;
+ cmd.arg = 0;
+ cmd.flags = MMC_RSP_NONE;
+
+ mmc_wait_for_cmd(host, &cmd, 0);
+
+ mmc_delay(1);
+}
+
+/*
+ * Apply power to the MMC stack.
+ */
+static void mmc_power_up(struct mmc_host *host)
+{
+ int bit = fls(host->ocr_avail) - 1;
+
+ host->ios.vdd = bit;
+ host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
+ host->ios.power_mode = MMC_POWER_UP;
+ host->ops->set_ios(host, &host->ios);
+
+ mmc_delay(1);
+
+ host->ios.clock = host->f_min;
+ host->ios.power_mode = MMC_POWER_ON;
+ host->ops->set_ios(host, &host->ios);
+
+ mmc_delay(2);
+}
+
+static void mmc_power_off(struct mmc_host *host)
+{
+ host->ios.clock = 0;
+ host->ios.vdd = 0;
+ host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
+ host->ios.power_mode = MMC_POWER_OFF;
+ host->ops->set_ios(host, &host->ios);
+}
+
+static int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
+{
+ struct mmc_command cmd;
+ int i, err = 0;
+
+ cmd.opcode = MMC_SEND_OP_COND;
+ cmd.arg = ocr;
+ cmd.flags = MMC_RSP_R3;
+
+ for (i = 100; i; i--) {
+ err = mmc_wait_for_cmd(host, &cmd, 0);
+ if (err != MMC_ERR_NONE)
+ break;
+
+ if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
+ break;
+
+ err = MMC_ERR_TIMEOUT;
+
+ mmc_delay(10);
+ }
+
+ if (rocr)
+ *rocr = cmd.resp[0];
+
+ return err;
+}
+
+/*
+ * Discover cards by requesting their CID. If this command
+ * times out, it is not an error; there are no further cards
+ * to be discovered. Add new cards to the list.
+ *
+ * Create a mmc_card entry for each discovered card, assigning
+ * it an RCA, and save the raw CID for decoding later.
+ */
+static void mmc_discover_cards(struct mmc_host *host)
+{
+ struct mmc_card *card;
+ unsigned int first_rca = 1, err;
+
+ while (1) {
+ struct mmc_command cmd;
+
+ cmd.opcode = MMC_ALL_SEND_CID;
+ cmd.arg = 0;
+ cmd.flags = MMC_RSP_R2;
+
+ err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
+ if (err == MMC_ERR_TIMEOUT) {
+ err = MMC_ERR_NONE;
+ break;
+ }
+ if (err != MMC_ERR_NONE) {
+ printk(KERN_ERR "%s: error requesting CID: %d\n",
+ host->host_name, err);
+ break;
+ }
+
+ card = mmc_find_card(host, cmd.resp);
+ if (!card) {
+ card = mmc_alloc_card(host, cmd.resp, &first_rca);
+ if (IS_ERR(card)) {
+ err = PTR_ERR(card);
+ break;
+ }
+ list_add(&card->node, &host->cards);
+ }
+
+ card->state &= ~MMC_STATE_DEAD;
+
+ cmd.opcode = MMC_SET_RELATIVE_ADDR;
+ cmd.arg = card->rca << 16;
+ cmd.flags = MMC_RSP_R1;
+
+ err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
+ if (err != MMC_ERR_NONE)
+ mmc_card_set_dead(card);
+ }
+}
+
+static void mmc_read_csds(struct mmc_host *host)
+{
+ struct mmc_card *card;
+
+ list_for_each_entry(card, &host->cards, node) {
+ struct mmc_command cmd;
+ int err;
+
+ if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
+ continue;
+
+ cmd.opcode = MMC_SEND_CSD;
+ cmd.arg = card->rca << 16;
+ cmd.flags = MMC_RSP_R2;
+
+ err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
+ if (err != MMC_ERR_NONE) {
+ mmc_card_set_dead(card);
+ continue;
+ }
+
+ memcpy(card->raw_csd, cmd.resp, sizeof(card->raw_csd));
+
+ mmc_decode_csd(card);
+ mmc_decode_cid(card);
+ }
+}
+
+static unsigned int mmc_calculate_clock(struct mmc_host *host)
+{
+ struct mmc_card *card;
+ unsigned int max_dtr = host->f_max;
+
+ list_for_each_entry(card, &host->cards, node)
+ if (!mmc_card_dead(card) && max_dtr > card->csd.max_dtr)
+ max_dtr = card->csd.max_dtr;
+
+ DBG("MMC: selected %d.%03dMHz transfer rate\n",
+ max_dtr / 1000000, (max_dtr / 1000) % 1000);
+
+ return max_dtr;
+}
+
+/*
+ * Check whether cards we already know about are still present.
+ * We do this by requesting status, and checking whether a card
+ * responds.
+ *
+ * A request for status does not cause a state change in data
+ * transfer mode.
+ */
+static void mmc_check_cards(struct mmc_host *host)
+{
+ struct list_head *l, *n;
+
+ mmc_deselect_cards(host);
+
+ list_for_each_safe(l, n, &host->cards) {
+ struct mmc_card *card = mmc_list_to_card(l);
+ struct mmc_command cmd;
+ int err;
+
+ cmd.opcode = MMC_SEND_STATUS;
+ cmd.arg = card->rca << 16;
+ cmd.flags = MMC_RSP_R1;
+
+ err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
+ if (err == MMC_ERR_NONE)
+ continue;
+
+ mmc_card_set_dead(card);
+ }
+}
+
+static void mmc_setup(struct mmc_host *host)
+{
+ if (host->ios.power_mode != MMC_POWER_ON) {
+ int err;
+ u32 ocr;
+
+ mmc_power_up(host);
+ mmc_idle_cards(host);
+
+ err = mmc_send_op_cond(host, 0, &ocr);
+ if (err != MMC_ERR_NONE)
+ return;
+
+ host->ocr = mmc_select_voltage(host, ocr);
+
+ /*
+ * 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.
+ */
+ if (host->ocr)
+ mmc_idle_cards(host);
+ } else {
+ host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
+ host->ios.clock = host->f_min;
+ host->ops->set_ios(host, &host->ios);
+
+ /*
+ * We should remember the OCR mask from the existing
+ * cards, and detect the new cards OCR mask, combine
+ * the two and re-select the VDD. However, if we do
+ * change VDD, we should do an idle, and then do a
+ * full re-initialisation. We would need to notify
+ * drivers so that they can re-setup the cards as
+ * well, while keeping their queues at bay.
+ *
+ * For the moment, we take the easy way out - if the
+ * new cards don't like our currently selected VDD,
+ * they drop off the bus.
+ */
+ }
+
+ if (host->ocr == 0)
+ return;
+
+ /*
+ * Send the selected OCR multiple times... until the cards
+ * all get the idea that they should be ready for CMD2.
+ * (My SanDisk card seems to need this.)
+ */
+ mmc_send_op_cond(host, host->ocr, NULL);
+
+ mmc_discover_cards(host);
+
+ /*
+ * Ok, now switch to push-pull mode.
+ */
+ host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
+ host->ops->set_ios(host, &host->ios);
+
+ mmc_read_csds(host);
+}
+
+
+/**
+ * mmc_detect_change - process change of state on a MMC socket
+ * @host: host which changed state.
+ *
+ * All we know is that card(s) have been inserted or removed
+ * from the socket(s). We don't know which socket or cards.
+ */
+void mmc_detect_change(struct mmc_host *host)
+{
+ schedule_work(&host->detect);
+}
+
+EXPORT_SYMBOL(mmc_detect_change);
+
+
+static void mmc_rescan(void *data)
+{
+ struct mmc_host *host = data;
+ struct list_head *l, *n;
+
+ mmc_claim_host(host);
+
+ if (host->ios.power_mode == MMC_POWER_ON)
+ mmc_check_cards(host);
+
+ mmc_setup(host);
+
+ if (!list_empty(&host->cards)) {
+ /*
+ * (Re-)calculate the fastest clock rate which the
+ * attached cards and the host support.
+ */
+ host->ios.clock = mmc_calculate_clock(host);
+ host->ops->set_ios(host, &host->ios);
+ }
+
+ mmc_release_host(host);
+
+ list_for_each_safe(l, n, &host->cards) {
+ struct mmc_card *card = mmc_list_to_card(l);
+
+ /*
+ * If this is a new and good card, register it.
+ */
+ if (!mmc_card_present(card) && !mmc_card_dead(card)) {
+ if (mmc_register_card(card))
+ mmc_card_set_dead(card);
+ else
+ mmc_card_set_present(card);
+ }
+
+ /*
+ * If this card is dead, destroy it.
+ */
+ if (mmc_card_dead(card)) {
+ list_del(&card->node);
+ mmc_remove_card(card);
+ }
+ }
+
+ /*
+ * If we discover that there are no cards on the
+ * bus, turn off the clock and power down.
+ */
+ if (list_empty(&host->cards))
+ mmc_power_off(host);
+}
+
+
+/**
+ * mmc_alloc_host - initialise the per-host structure.
+ * @extra: sizeof private data structure
+ * @dev: pointer to host device model structure
+ *
+ * Initialise the per-host structure.
+ */
+struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
+{
+ struct mmc_host *host;
+
+ host = kmalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
+ if (host) {
+ memset(host, 0, sizeof(struct mmc_host) + extra);
+
+ spin_lock_init(&host->lock);
+ init_waitqueue_head(&host->wq);
+ INIT_LIST_HEAD(&host->cards);
+ INIT_WORK(&host->detect, mmc_rescan, host);
+
+ host->dev = dev;
+
+ /*
+ * By default, hosts do not support SGIO or large requests.
+ * They have to set these according to their abilities.
+ */
+ host->max_hw_segs = 1;
+ host->max_phys_segs = 1;
+ host->max_sectors = 1 << (PAGE_CACHE_SHIFT - 9);
+ host->max_seg_size = PAGE_CACHE_SIZE;
+ }
+
+ return host;
+}
+
+EXPORT_SYMBOL(mmc_alloc_host);
+
+/**
+ * mmc_add_host - initialise host hardware
+ * @host: mmc host
+ */
+int mmc_add_host(struct mmc_host *host)
+{
+ static unsigned int host_num;
+
+ snprintf(host->host_name, sizeof(host->host_name),
+ "mmc%d", host_num++);
+
+ mmc_power_off(host);
+ mmc_detect_change(host);
+
+ return 0;
+}
+
+EXPORT_SYMBOL(mmc_add_host);
+
+/**
+ * mmc_remove_host - remove host hardware
+ * @host: mmc host
+ *
+ * Unregister and remove all cards associated with this host,
+ * and power down the MMC bus.
+ */
+void mmc_remove_host(struct mmc_host *host)
+{
+ struct list_head *l, *n;
+
+ list_for_each_safe(l, n, &host->cards) {
+ struct mmc_card *card = mmc_list_to_card(l);
+
+ mmc_remove_card(card);
+ }
+
+ mmc_power_off(host);
+}
+
+EXPORT_SYMBOL(mmc_remove_host);
+
+/**
+ * mmc_free_host - free the host structure
+ * @host: mmc host
+ *
+ * Free the host once all references to it have been dropped.
+ */
+void mmc_free_host(struct mmc_host *host)
+{
+ flush_scheduled_work();
+ kfree(host);
+}
+
+EXPORT_SYMBOL(mmc_free_host);
+
+#ifdef CONFIG_PM
+
+/**
+ * mmc_suspend_host - suspend a host
+ * @host: mmc host
+ * @state: suspend mode (PM_SUSPEND_xxx)
+ */
+int mmc_suspend_host(struct mmc_host *host, u32 state)
+{
+ mmc_claim_host(host);
+ mmc_deselect_cards(host);
+ mmc_power_off(host);
+ mmc_release_host(host);
+
+ return 0;
+}
+
+EXPORT_SYMBOL(mmc_suspend_host);
+
+/**
+ * mmc_resume_host - resume a previously suspended host
+ * @host: mmc host
+ */
+int mmc_resume_host(struct mmc_host *host)
+{
+ mmc_detect_change(host);
+
+ return 0;
+}
+
+EXPORT_SYMBOL(mmc_resume_host);
+
+#endif
+
+MODULE_LICENSE("GPL");