* linux/drivers/mmc/mmc.c
*
* Copyright (C) 2003-2004 Russell King, All Rights Reserved.
+ * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
+ * SD support Copyright (C) 2005 Pierre Ossman, 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
#include <linux/delay.h>
#include <linux/pagemap.h>
#include <linux/err.h>
+#include <asm/scatterlist.h>
+#include <linux/scatterlist.h>
#include <linux/mmc/card.h>
#include <linux/mmc/host.h>
EXPORT_SYMBOL(mmc_wait_for_app_cmd);
+static int mmc_select_card(struct mmc_host *host, struct mmc_card *card);
+
/**
* __mmc_claim_host - exclusively claim a host
* @host: mmc host to claim
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);
+ if (card != (void *)-1) {
+ err = mmc_select_card(host, card);
+ if (err != MMC_ERR_NONE)
+ return err;
}
return err;
EXPORT_SYMBOL(mmc_release_host);
+static int mmc_select_card(struct mmc_host *host, struct mmc_card *card)
+{
+ int err;
+ struct mmc_command cmd;
+
+ BUG_ON(host->card_busy == NULL);
+
+ if (host->card_selected == card)
+ return MMC_ERR_NONE;
+
+ 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);
+ if (err != MMC_ERR_NONE)
+ return err;
+
+ /*
+ * Default bus width is 1 bit.
+ */
+ host->ios.bus_width = MMC_BUS_WIDTH_1;
+
+ /*
+ * We can only change the bus width of the selected
+ * card so therefore we have to put the handling
+ * here.
+ */
+ if (host->caps & MMC_CAP_4_BIT_DATA) {
+ /*
+ * The card is in 1 bit mode by default so
+ * we only need to change if it supports the
+ * wider version.
+ */
+ if (mmc_card_sd(card) &&
+ (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
+ struct mmc_command cmd;
+ cmd.opcode = SD_APP_SET_BUS_WIDTH;
+ cmd.arg = SD_BUS_WIDTH_4;
+ cmd.flags = MMC_RSP_R1;
+
+ err = mmc_wait_for_app_cmd(host, card->rca, &cmd,
+ CMD_RETRIES);
+ if (err != MMC_ERR_NONE)
+ return err;
+
+ host->ios.bus_width = MMC_BUS_WIDTH_4;
+ }
+ }
+
+ host->ops->set_ios(host, &host->ios);
+
+ return MMC_ERR_NONE;
+}
+
/*
* Ensure that no card is selected.
*/
card->cid.month = UNSTUFF_BITS(resp, 8, 4);
card->cid.year += 2000; /* SD cards year offset */
- }
- else {
+ } else {
/*
* The selection of the format here is based upon published
* specs from sandisk and from what people have reported.
csd->capacity = (1 + m) << (e + 2);
csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
- }
- else {
+ } else {
/*
* We only understand CSD structure v1.1 and v1.2.
* v1.2 has extra information in bits 15, 11 and 10.
}
}
+/*
+ * Given a 64-bit response, decode to our card SCR structure.
+ */
+static void mmc_decode_scr(struct mmc_card *card)
+{
+ struct sd_scr *scr = &card->scr;
+ unsigned int scr_struct;
+ u32 resp[4];
+
+ BUG_ON(!mmc_card_sd(card));
+
+ resp[3] = card->raw_scr[1];
+ resp[2] = card->raw_scr[0];
+
+ scr_struct = UNSTUFF_BITS(resp, 60, 4);
+ if (scr_struct != 0) {
+ printk("%s: unrecognised SCR structure version %d\n",
+ mmc_hostname(card->host), scr_struct);
+ mmc_card_set_bad(card);
+ return;
+ }
+
+ scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
+ scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
+}
+
/*
* Locate a MMC card on this MMC host given a raw CID.
*/
host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
host->ios.chip_select = MMC_CS_DONTCARE;
host->ios.power_mode = MMC_POWER_UP;
+ host->ios.bus_width = MMC_BUS_WIDTH_1;
host->ops->set_ios(host, &host->ios);
mmc_delay(1);
host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
host->ios.chip_select = MMC_CS_DONTCARE;
host->ios.power_mode = MMC_POWER_OFF;
+ host->ios.bus_width = MMC_BUS_WIDTH_1;
host->ops->set_ios(host, &host->ios);
}
err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
if (err != MMC_ERR_NONE)
mmc_card_set_dead(card);
- else
+ else {
card->rca = cmd.resp[0] >> 16;
- }
- else {
+
+ if (!host->ops->get_ro) {
+ printk(KERN_WARNING "%s: host does not "
+ "support reading read-only "
+ "switch. assuming write-enable.\n",
+ mmc_hostname(host));
+ } else {
+ if (host->ops->get_ro(host))
+ mmc_card_set_readonly(card);
+ }
+ }
+ } else {
cmd.opcode = MMC_SET_RELATIVE_ADDR;
cmd.arg = card->rca << 16;
cmd.flags = MMC_RSP_R1;
}
}
+static void mmc_read_scrs(struct mmc_host *host)
+{
+ int err;
+ struct mmc_card *card;
+
+ struct mmc_request mrq;
+ struct mmc_command cmd;
+ struct mmc_data data;
+
+ struct scatterlist sg;
+
+ list_for_each_entry(card, &host->cards, node) {
+ if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
+ continue;
+ if (!mmc_card_sd(card))
+ continue;
+
+ err = mmc_select_card(host, card);
+ if (err != MMC_ERR_NONE) {
+ mmc_card_set_dead(card);
+ continue;
+ }
+
+ memset(&cmd, 0, sizeof(struct mmc_command));
+
+ cmd.opcode = MMC_APP_CMD;
+ cmd.arg = card->rca << 16;
+ cmd.flags = MMC_RSP_R1;
+
+ err = mmc_wait_for_cmd(host, &cmd, 0);
+ if ((err != MMC_ERR_NONE) || !(cmd.resp[0] & R1_APP_CMD)) {
+ mmc_card_set_dead(card);
+ continue;
+ }
+
+ memset(&cmd, 0, sizeof(struct mmc_command));
+
+ cmd.opcode = SD_APP_SEND_SCR;
+ cmd.arg = 0;
+ cmd.flags = MMC_RSP_R1;
+
+ memset(&data, 0, sizeof(struct mmc_data));
+
+ data.timeout_ns = card->csd.tacc_ns * 10;
+ data.timeout_clks = card->csd.tacc_clks * 10;
+ data.blksz_bits = 3;
+ data.blocks = 1;
+ data.flags = MMC_DATA_READ;
+ data.sg = &sg;
+ data.sg_len = 1;
+
+ memset(&mrq, 0, sizeof(struct mmc_request));
+
+ mrq.cmd = &cmd;
+ mrq.data = &data;
+
+ sg_init_one(&sg, (u8*)card->raw_scr, 8);
+
+ err = mmc_wait_for_req(host, &mrq);
+ if (err != MMC_ERR_NONE) {
+ mmc_card_set_dead(card);
+ continue;
+ }
+
+ card->raw_scr[0] = ntohl(card->raw_scr[0]);
+ card->raw_scr[1] = ntohl(card->raw_scr[1]);
+
+ mmc_decode_scr(card);
+ }
+
+ mmc_deselect_cards(host);
+}
+
static unsigned int mmc_calculate_clock(struct mmc_host *host)
{
struct mmc_card *card;
int err;
u32 ocr;
- host->mode = MMC_MODE_MMC;
+ host->mode = MMC_MODE_SD;
mmc_power_up(host);
mmc_idle_cards(host);
- err = mmc_send_op_cond(host, 0, &ocr);
+ err = mmc_send_app_op_cond(host, 0, &ocr);
/*
- * If we fail to detect any cards then try
- * searching for SD cards.
+ * If we fail to detect any SD cards then try
+ * searching for MMC cards.
*/
- if (err != MMC_ERR_NONE)
- {
- err = mmc_send_app_op_cond(host, 0, &ocr);
+ if (err != MMC_ERR_NONE) {
+ host->mode = MMC_MODE_MMC;
+
+ err = mmc_send_op_cond(host, 0, &ocr);
if (err != MMC_ERR_NONE)
return;
-
- host->mode = MMC_MODE_SD;
}
host->ocr = mmc_select_voltage(host, ocr);
host->ops->set_ios(host, &host->ios);
mmc_read_csds(host);
+
+ if (host->mode == MMC_MODE_SD)
+ mmc_read_scrs(host);
}
/**
* mmc_detect_change - process change of state on a MMC socket
* @host: host which changed state.
+ * @delay: optional delay to wait before detection (jiffies)
*
* 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)
+void mmc_detect_change(struct mmc_host *host, unsigned long delay)
{
- schedule_work(&host->detect);
+ if (delay)
+ schedule_delayed_work(&host->detect, delay);
+ else
+ schedule_work(&host->detect);
}
EXPORT_SYMBOL(mmc_detect_change);
ret = mmc_add_host_sysfs(host);
if (ret == 0) {
mmc_power_off(host);
- mmc_detect_change(host);
+ mmc_detect_change(host, 0);
}
return ret;
*/
int mmc_resume_host(struct mmc_host *host)
{
- mmc_detect_change(host);
+ mmc_rescan(host);
return 0;
}
projects / powerpc.git / blobdiff