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authorPierre Ossman <drzeus-list@drzeus.cx>2005-09-06 15:18:53 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-07 16:57:50 -0700
commitb57c43ad81602589afca3948a5a7121e40026e17 (patch)
tree39592e326f498231b39e95c299ad6fcd559341ef /drivers/mmc
parenta00fc09029f02ca833cf90e5d5625f08c4ac4f51 (diff)
downloadlinux-b57c43ad81602589afca3948a5a7121e40026e17.tar.gz
[PATCH] sd: SCR register
Read the SD specific SCR register from the card. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx> Cc: Russell King <rmk@arm.linux.org.uk> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/mmc.c143
1 files changed, 133 insertions, 10 deletions
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 725c6ad3eb64..21d4fb3314f8 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -16,6 +16,8 @@
#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>
@@ -246,6 +248,8 @@ int mmc_wait_for_app_cmd(struct mmc_host *host, unsigned int rca,
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
@@ -278,16 +282,10 @@ int __mmc_claim_host(struct mmc_host *host, struct mmc_card *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);
+ if (card != (void *)-1) {
+ err = mmc_select_card(host, card);
+ if (err != MMC_ERR_NONE)
+ return err;
}
return err;
@@ -317,6 +315,29 @@ void mmc_release_host(struct mmc_host *host)
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;
+
+ return MMC_ERR_NONE;
+}
+
/*
* Ensure that no card is selected.
*/
@@ -526,6 +547,32 @@ static void mmc_decode_csd(struct mmc_card *card)
}
/*
+ * 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.
*/
static struct mmc_card *mmc_find_card(struct mmc_host *host, u32 *raw_cid)
@@ -789,6 +836,79 @@ static void mmc_read_csds(struct mmc_host *host)
}
}
+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;
@@ -912,6 +1032,9 @@ static void mmc_setup(struct mmc_host *host)
host->ops->set_ios(host, &host->ios);
mmc_read_csds(host);
+
+ if (host->mode == MMC_MODE_SD)
+ mmc_read_scrs(host);
}