sdio: split up common and function CIS parsing

Add a more clean separation between global, common CIS information
and the function specific one as we need the common information in
places where no specific function is specified.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 176 insertions, 22 deletions

diff --git a/drivers/mmc/core/sdio_cis.c b/drivers/mmc/core/sdio_cis.c
index b6c7342572c..ec806a1229b 100644
--- a/drivers/mmc/core/sdio_cis.c
+++ b/drivers/mmc/core/sdio_cis.c
@@ -16,60 +16,152 @@
 #include <linux/kernel.h>
 
 #include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
 #include <linux/mmc/sdio.h>
 #include <linux/mmc/sdio_func.h>
 
 #include "sdio_cis.h"
 #include "sdio_ops.h"
 
-static int cistpl_manfid(struct sdio_func *func,
-			 const unsigned char *buf,
-			 unsigned size)
+static int cistpl_manfid(struct mmc_card *card, struct sdio_func *func,
+			 const unsigned char *buf, unsigned size)
 {
+	unsigned int vendor, device;
+
 	/* TPLMID_MANF */
-	func->vendor = buf[0] | (buf[1] << 8);
+	vendor = buf[0] | (buf[1] << 8);
 
 	/* TPLMID_CARD */
-	func->device = buf[2] | (buf[3] << 8);
+	device = buf[2] | (buf[3] << 8);
+
+	if (func) {
+		func->vendor = vendor;
+		func->device = device;
+	} else {
+		card->cis.vendor = vendor;
+		card->cis.device = device;
+	}
+
+	return 0;
+}
+
+static const unsigned char speed_val[16] =
+	{ 0, 10, 12, 13, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80 };
+static const unsigned int speed_unit[8] =
+	{ 10000, 100000, 1000000, 10000000, 0, 0, 0, 0 };
+
+static int cistpl_funce_common(struct mmc_card *card,
+			       const unsigned char *buf, unsigned size)
+{
+	if (size < 0x04 || buf[0] != 0)
+		return -EINVAL;
+
+	/* TPLFE_FN0_BLK_SIZE */
+	card->cis.blksize = buf[1] | (buf[2] << 8);
+
+	/* TPLFE_MAX_TRAN_SPEED */
+	card->cis.max_dtr = speed_val[(buf[3] >> 3) & 15] *
+			    speed_unit[buf[3] & 7];
+
+	return 0;
+}
+
+static int cistpl_funce_func(struct sdio_func *func,
+			     const unsigned char *buf, unsigned size)
+{
+	unsigned vsn;
+	unsigned min_size;
+
+	vsn = func->card->cccr.sdio_vsn;
+	min_size = (vsn == SDIO_SDIO_REV_1_00) ? 28 : 42;
+
+	if (size < min_size || buf[0] != 1)
+		return -EINVAL;
+
+	/* TPLFE_MAX_BLK_SIZE */
+	func->blksize = buf[12] | (buf[13] << 8);
 
 	return 0;
 }
 
+static int cistpl_funce(struct mmc_card *card, struct sdio_func *func,
+			const unsigned char *buf, unsigned size)
+{
+	int ret;
+
+	/*
+	 * There should be two versions of the CISTPL_FUNCE tuple,
+	 * one for the common CIS (function 0) and a version used by
+	 * the individual function's CIS (1-7). Yet, the later has a
+	 * different length depending on the SDIO spec version.
+	 */
+	if (func)
+		ret = cistpl_funce_func(func, buf, size);
+	else
+		ret = cistpl_funce_common(card, buf, size);
+
+	if (ret) {
+		printk(KERN_ERR "%s: bad CISTPL_FUNCE size %u "
+		       "type %u\n", mmc_hostname(card->host), size, buf[0]);
+		return ret;
+	}
+
+	return 0;
+}
+
+typedef int (tpl_parse_t)(struct mmc_card *, struct sdio_func *,
+			   const unsigned char *, unsigned);
+
 struct cis_tpl {
 	unsigned char code;
 	unsigned char min_size;
-	int (*parse)(struct sdio_func *, const unsigned char *buf, unsigned size);
+	tpl_parse_t *parse;
 };
 
 static const struct cis_tpl cis_tpl_list[] = {
 	{	0x15,	3,	/* cistpl_vers_1 */	},
 	{	0x20,	4,	cistpl_manfid		},
 	{	0x21,	2,	/* cistpl_funcid */	},
-	{	0x22,	0,	/* cistpl_funce */	},
+	{	0x22,	0,	cistpl_funce		},
 };
 
-int sdio_read_cis(struct sdio_func *func)
+static int sdio_read_cis(struct mmc_card *card, struct sdio_func *func)
 {
 	int ret;
 	struct sdio_func_tuple *this, **prev;
 	unsigned i, ptr = 0;
 
+	/*
+	 * Note that this works for the common CIS (function number 0) as
+	 * well as a function's CIS * since SDIO_CCCR_CIS and SDIO_FBR_CIS
+	 * have the same offset.
+	 */
 	for (i = 0; i < 3; i++) {
-		unsigned char x;
-		ret = mmc_io_rw_direct(func->card, 0, 0,
-				func->num * 0x100 + SDIO_FBR_CIS + i, 0, &x);
+		unsigned char x, fn;
+
+		if (func)
+			fn = func->num;
+		else
+			fn = 0;
+
+		ret = mmc_io_rw_direct(card, 0, 0,
+				       fn * 0x100 + SDIO_FBR_CIS + i, 0, &x);
 		if (ret)
 			return ret;
 		ptr |= x << (i * 8);
 	}
 
-	/* find the list tail */
-	for (prev = &func->tuples; *prev; prev = &(*prev)->next);
+	if (func)
+		prev = &func->tuples;
+	else
+		prev = &card->tuples;
+
+	BUG_ON(*prev);
 
 	do {
 		unsigned char tpl_code, tpl_link;
 
-		ret = mmc_io_rw_direct(func->card, 0, 0, ptr++, 0, &tpl_code);
+		ret = mmc_io_rw_direct(card, 0, 0, ptr++, 0, &tpl_code);
 		if (ret)
 			break;
 
@@ -77,7 +169,7 @@ int sdio_read_cis(struct sdio_func *func)
 		if (tpl_code == 0xff)
 			break;
 
-		ret = mmc_io_rw_direct(func->card, 0, 0, ptr++, 0, &tpl_link);
+		ret = mmc_io_rw_direct(card, 0, 0, ptr++, 0, &tpl_link);
 		if (ret)
 			break;
 
@@ -86,7 +178,7 @@ int sdio_read_cis(struct sdio_func *func)
 			return -ENOMEM;
 
 		for (i = 0; i < tpl_link; i++) {
-			ret = mmc_io_rw_direct(func->card, 0, 0,
+			ret = mmc_io_rw_direct(card, 0, 0,
 					       ptr + i, 0, &this->data[i]);
 			if (ret)
 				break;
@@ -108,30 +200,45 @@ int sdio_read_cis(struct sdio_func *func)
 			prev = &this->next;
 			printk(KERN_DEBUG
 			       "%s: queuing CIS tuple 0x%02x length %u\n",
-			       sdio_func_id(func), tpl_code, tpl_link);
+			       mmc_hostname(card->host), tpl_code, tpl_link);
 		} else {
 			const struct cis_tpl *tpl = cis_tpl_list + i;
 			if (tpl_link < tpl->min_size) {
 				printk(KERN_ERR
 				       "%s: bad CIS tuple 0x%02x (length = %u, expected >= %u)\n",
-				       sdio_func_id(func), tpl_code, tpl_link, tpl->min_size);
+				       mmc_hostname(card->host),
+				       tpl_code, tpl_link, tpl->min_size);
 				ret = -EINVAL;
-			} else if (tpl->parse)
-				ret = tpl->parse(func, this->data, tpl_link);
+			} else if (tpl->parse) {
+				ret = tpl->parse(card, func,
+						 this->data, tpl_link);
+			}
 			kfree(this);
 		}
 
 		ptr += tpl_link;
 	} while (!ret);
 
+	/*
+	 * Link in all unknown tuples found in the common CIS so that
+	 * drivers don't have to go digging in two places.
+	 */
+	if (func)
+		*prev = card->tuples;
+
 	return ret;
 }
 
-void sdio_free_cis(struct sdio_func *func)
+int sdio_read_common_cis(struct mmc_card *card)
+{
+	return sdio_read_cis(card, NULL);
+}
+
+void sdio_free_common_cis(struct mmc_card *card)
 {
 	struct sdio_func_tuple *tuple, *victim;
 
-	tuple = func->tuples;
+	tuple = card->tuples;
 
 	while (tuple) {
 		victim = tuple;
@@ -139,6 +246,53 @@ void sdio_free_cis(struct sdio_func *func)
 		kfree(victim);
 	}
 
+	card->tuples = NULL;
+}
+
+int sdio_read_func_cis(struct sdio_func *func)
+{
+	int ret;
+
+	ret = sdio_read_cis(func->card, func);
+	if (ret)
+		return ret;
+
+	/*
+	 * Since we've linked to tuples in the card structure,
+	 * we must make sure we have a reference to it.
+	 */
+	get_device(&func->card->dev);
+
+	/*
+	 * Vendor/device id is optional for function CIS, so
+	 * copy it from the card structure as needed.
+	 */
+	if (func->vendor == 0) {
+		func->vendor = func->card->cis.vendor;
+		func->device = func->card->cis.device;
+	}
+
+	return 0;
+}
+
+void sdio_free_func_cis(struct sdio_func *func)
+{
+	struct sdio_func_tuple *tuple, *victim;
+
+	tuple = func->tuples;
+
+	while (tuple && tuple != func->card->tuples) {
+		victim = tuple;
+		tuple = tuple->next;
+		kfree(victim);
+	}
+
 	func->tuples = NULL;
+
+	/*
+	 * We have now removed the link to the tuples in the
+	 * card structure, so remove the reference.
+	 */
+	put_device(&func->card->dev);
 }