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Date: Sat, 5 Jun 2010 19:29:24 +0200 (CEST)
From: Michał Mirosław
<mirq-linux@...e.qmqm.pl>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
Adrian Hunter <adrian.hunter@...ia.com>,
Chris Ball <cjb@...top.org>
>From 46eda5101dd303feac7f8353023f78bf4f7fd2fe Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20Miros=C5=82aw?= <mirq-linux@...e.qmqm.pl>
Date: Sat, 5 Jun 2010 19:03:40 +0200
Subject: [PATCH 2/2] mmc: implement SD-combo (IO+mem) support
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
---
drivers/mmc/core/bus.c | 9 +++
drivers/mmc/core/core.c | 12 ++++-
drivers/mmc/core/sdio.c | 135 ++++++++++++++++++++++++++++++++++++++-------
include/linux/mmc/card.h | 1 +
4 files changed, 134 insertions(+), 23 deletions(-)
diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c
index 49d9dca..7cd9749 100644
--- a/drivers/mmc/core/bus.c
+++ b/drivers/mmc/core/bus.c
@@ -37,6 +37,8 @@ static ssize_t mmc_type_show(struct device *dev,
return sprintf(buf, "SD\n");
case MMC_TYPE_SDIO:
return sprintf(buf, "SDIO\n");
+ case MMC_TYPE_SD_COMBO:
+ return sprintf(buf, "SDcombo\n");
default:
return -EFAULT;
}
@@ -74,6 +76,9 @@ mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
case MMC_TYPE_SDIO:
type = "SDIO";
break;
+ case MMC_TYPE_SD_COMBO:
+ type = "SDcombo";
+ break;
default:
type = NULL;
}
@@ -239,6 +244,10 @@ int mmc_add_card(struct mmc_card *card)
case MMC_TYPE_SDIO:
type = "SDIO";
break;
+ case MMC_TYPE_SD_COMBO:
+ type = "SD-combo";
+ if (mmc_card_blockaddr(card))
+ type = "SDHC-combo";
default:
type = "?";
break;
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 3168ebd..87cf0de 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1099,8 +1099,15 @@ void mmc_rescan(struct work_struct *work)
*/
err = mmc_send_io_op_cond(host, 0, &ocr);
if (!err) {
- if (mmc_attach_sdio(host, ocr))
- mmc_power_off(host);
+ if (mmc_attach_sdio(host, ocr)) {
+ mmc_claim_host(host);
+ /* try SDMEM (but not MMC) even if SDIO is broken */
+ if (mmc_send_app_op_cond(host, 0, &ocr))
+ goto out_fail;
+
+ if (mmc_attach_sd(host, ocr))
+ mmc_power_off(host);
+ }
goto out;
}
@@ -1124,6 +1131,7 @@ void mmc_rescan(struct work_struct *work)
goto out;
}
+out_fail:
mmc_release_host(host);
mmc_power_off(host);
diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index 8a97e99..dc23427 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -160,9 +160,7 @@ static int sdio_enable_wide(struct mmc_card *card)
if (ret)
return ret;
- mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
-
- return 0;
+ return 1;
}
/*
@@ -222,10 +220,34 @@ static int sdio_disable_wide(struct mmc_card *card)
return 0;
}
+
+static int sdio_enable_4bit_bus(struct mmc_card *card)
+{
+ int err;
+
+ if (card->type == MMC_TYPE_SDIO)
+ return sdio_enable_wide(card);
+
+ if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
+ (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
+ err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
+ if (err)
+ return err;
+ } else
+ return 0;
+
+ err = sdio_enable_wide(card);
+ if (err <= 0)
+ mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
+
+ return err;
+}
+
+
/*
* Test if the card supports high-speed mode and, if so, switch to it.
*/
-static int sdio_enable_hs(struct mmc_card *card)
+static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
{
int ret;
u8 speed;
@@ -240,7 +262,10 @@ static int sdio_enable_hs(struct mmc_card *card)
if (ret)
return ret;
- speed |= SDIO_SPEED_EHS;
+ if (enable)
+ speed |= SDIO_SPEED_EHS;
+ else
+ speed &= ~SDIO_SPEED_EHS;
ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
if (ret)
@@ -249,6 +274,24 @@ static int sdio_enable_hs(struct mmc_card *card)
return 1;
}
+/*
+ * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
+ */
+static int sdio_enable_hs(struct mmc_card *card)
+{
+ int ret;
+
+ ret = mmc_sdio_switch_hs(card, true);
+ if (ret <= 0 || card->type == MMC_TYPE_SDIO)
+ return ret;
+
+ ret = mmc_sd_switch_hs(card);
+ if (ret <= 0)
+ mmc_sdio_switch_hs(card, false);
+
+ return ret;
+}
+
static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
{
unsigned max_dtr;
@@ -265,6 +308,9 @@ static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
max_dtr = card->cis.max_dtr;
}
+ if (card->type == MMC_TYPE_SD_COMBO)
+ max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
+
return max_dtr;
}
@@ -310,7 +356,24 @@ static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
goto err;
}
- card->type = MMC_TYPE_SDIO;
+ err = mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid);
+
+ if (!err) {
+ card->type = MMC_TYPE_SD_COMBO;
+
+ if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
+ memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
+ mmc_remove_card(card);
+ return -ENOENT;
+ }
+ } else {
+ card->type = MMC_TYPE_SDIO;
+
+ if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
+ mmc_remove_card(card);
+ return -ENOENT;
+ }
+ }
/*
* For native busses: set card RCA and quit open drain mode.
@@ -324,6 +387,17 @@ static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
}
/*
+ * Read CSD, before selecting the card
+ */
+ if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
+ err = mmc_sd_get_csd(host, card);
+ if (err)
+ return err;
+
+ mmc_decode_cid(card);
+ }
+
+ /*
* Select card, as all following commands rely on that.
*/
if (!powered_resume && !mmc_host_is_spi(host)) {
@@ -350,14 +424,33 @@ static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
int same = (card->cis.vendor == oldcard->cis.vendor &&
card->cis.device == oldcard->cis.device);
mmc_remove_card(card);
- if (!same) {
- err = -ENOENT;
- goto err;
- }
+ if (!same)
+ return -ENOENT;
+
card = oldcard;
return 0;
}
+ if (card->type == MMC_TYPE_SD_COMBO) {
+ err = mmc_sd_setup_card(host, card, oldcard != NULL);
+ /* handle as SDIO-only card if memory init failed */
+ if (err) {
+ mmc_go_idle(host);
+ if (mmc_host_is_spi(host))
+ /* should not fail, as it worked previously */
+ mmc_spi_set_crc(host, use_spi_crc);
+ card->type = MMC_TYPE_SDIO;
+ } else
+ card->dev.type = &sd_type;
+ }
+
+ /*
+ * If needed, disconnect card detection pull-up resistor.
+ */
+ err = sdio_disable_cd(card);
+ if (err)
+ goto remove;
+
/*
* Switch to high-speed (if supported).
*/
@@ -375,8 +468,10 @@ static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
/*
* Switch to wider bus (if supported).
*/
- err = sdio_enable_wide(card);
- if (err)
+ err = sdio_enable_4bit_bus(card);
+ if (err > 0)
+ mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
+ else if (err)
goto remove;
if (!oldcard)
@@ -490,9 +585,14 @@ static int mmc_sdio_resume(struct mmc_host *host)
mmc_claim_host(host);
err = mmc_sdio_init_card(host, host->ocr, host->card,
(host->pm_flags & MMC_PM_KEEP_POWER));
- if (!err)
+ if (!err) {
/* We may have switched to 1-bit mode during suspend. */
- err = sdio_enable_wide(host->card);
+ err = sdio_enable_4bit_bus(host->card);
+ if (err > 0) {
+ mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
+ err = 0;
+ }
+ }
if (!err && host->sdio_irqs)
mmc_signal_sdio_irq(host);
mmc_release_host(host);
@@ -577,13 +677,6 @@ int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
card->sdio_funcs = 0;
/*
- * If needed, disconnect card detection pull-up resistor.
- */
- err = sdio_disable_cd(card);
- if (err)
- goto remove;
-
- /*
* Initialize (but don't add) all present functions.
*/
for (i = 0; i < funcs; i++, card->sdio_funcs++) {
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index d02d2c6..dc570f5 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -92,6 +92,7 @@ struct mmc_card {
#define MMC_TYPE_MMC 0 /* MMC card */
#define MMC_TYPE_SD 1 /* SD card */
#define MMC_TYPE_SDIO 2 /* SDIO card */
+#define MMC_TYPE_SD_COMBO 3 /* SD combo (IO+mem) card */
unsigned int state; /* (our) card state */
#define MMC_STATE_PRESENT (1<<0) /* present in sysfs */
#define MMC_STATE_READONLY (1<<1) /* card is read-only */
--
1.6.4.4
--
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