mmc: Add concept of an 'embedded' SDIO device.

This is required to support chips which use SDIO for signaling/
communication but do not implement the various card enumeration registers
as required for full SD / SDIO cards.

mmc: sdio: Fix bug where we're freeing the CIS tables we never allocated when using EMBEDDED_SDIO
mmc: Add max_blksize to embedded SDIO data

Signed-off-by: San Mehat <san@google.com>

diff --git a/drivers/mmc/core/Kconfig b/drivers/mmc/core/Kconfig
index ab37a6d..99de6c1 100644 (file)
--- a/drivers/mmc/core/Kconfig
+++ b/drivers/mmc/core/Kconfig
@@ -14,3 +14,11 @@ config MMC_UNSAFE_RESUME
          This option is usually just for embedded systems which use
          a MMC/SD card for rootfs. Most people should say N here.
 
+config MMC_EMBEDDED_SDIO
+       boolean "MMC embedded SDIO device support (EXPERIMENTAL)"
+       depends on EXPERIMENTAL
+       help
+         If you say Y here, support will be added for embedded SDIO
+         devices which do not contain the necessary enumeration
+         support in hardware to be properly detected.
+

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 044d84e..8c3cfb7 100644 (file)
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -812,6 +812,22 @@ EXPORT_SYMBOL(mmc_resume_host);
 
 #endif
 
+#ifdef CONFIG_MMC_EMBEDDED_SDIO
+void mmc_set_embedded_sdio_data(struct mmc_host *host,
+                               struct sdio_cis *cis,
+                               struct sdio_cccr *cccr,
+                               struct sdio_embedded_func *funcs,
+                               int num_funcs)
+{
+       host->embedded_sdio_data.cis = cis;
+       host->embedded_sdio_data.cccr = cccr;
+       host->embedded_sdio_data.funcs = funcs;
+       host->embedded_sdio_data.num_funcs = num_funcs;
+}
+
+EXPORT_SYMBOL(mmc_set_embedded_sdio_data);
+#endif
+
 static int __init mmc_init(void)
 {
        int ret;

diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index 4eab79e..7d4f471 100644 (file)
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -24,6 +24,10 @@
 #include "sdio_ops.h"
 #include "sdio_cis.h"
 
+#ifdef CONFIG_MMC_EMBEDDED_SDIO
+#include <linux/mmc/sdio_ids.h>
+#endif
+
 static int sdio_read_fbr(struct sdio_func *func)
 {
        int ret;
@@ -284,6 +288,11 @@ int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
         */
        funcs = (ocr & 0x70000000) >> 28;
 
+#ifdef CONFIG_MMC_EMBEDDED_SDIO
+       if (host->embedded_sdio_data.funcs)
+               funcs = host->embedded_sdio_data.num_funcs;
+#endif
+
        /*
         * Allocate card structure.
         */
@@ -321,17 +330,33 @@ int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
        /*
         * Read the common registers.
         */
-       err = sdio_read_cccr(card);
-       if (err)
-               goto remove;
-
-       /*
-        * Read the common CIS tuples.
-        */
-       err = sdio_read_common_cis(card);
-       if (err)
-               goto remove;
 
+#ifdef CONFIG_MMC_EMBEDDED_SDIO
+       if (host->embedded_sdio_data.cccr)
+               memcpy(&card->cccr, host->embedded_sdio_data.cccr, sizeof(struct sdio_cccr));
+       else {
+#endif
+               err = sdio_read_cccr(card);
+               if (err)
+                       goto remove;
+#ifdef CONFIG_MMC_EMBEDDED_SDIO
+       }
+#endif
+
+#ifdef CONFIG_MMC_EMBEDDED_SDIO
+       if (host->embedded_sdio_data.cis)
+               memcpy(&card->cis, host->embedded_sdio_data.cis, sizeof(struct sdio_cis));
+       else {
+#endif
+               /*
+                * Read the common CIS tuples.
+                */
+               err = sdio_read_common_cis(card);
+               if (err)
+                       goto remove;
+#ifdef CONFIG_MMC_EMBEDDED_SDIO
+       }
+#endif
        /*
         * No support for high-speed yet, so just set
         * the card's maximum speed.
@@ -349,9 +374,27 @@ int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
         * Initialize (but don't add) all present functions.
         */
        for (i = 0;i < funcs;i++) {
-               err = sdio_init_func(host->card, i + 1);
-               if (err)
-                       goto remove;
+#ifdef CONFIG_MMC_EMBEDDED_SDIO
+               if (host->embedded_sdio_data.funcs) {
+                       struct sdio_func *tmp;
+
+                       tmp = sdio_alloc_func(host->card);
+                       if (IS_ERR(tmp))
+                               goto remove;
+                       tmp->num = (i + 1);
+                       card->sdio_func[i] = tmp;
+                       tmp->class = host->embedded_sdio_data.funcs[i].f_class;
+                       tmp->max_blksize = host->embedded_sdio_data.funcs[i].f_maxblksize;
+                       tmp->vendor = card->cis.vendor;
+                       tmp->device = card->cis.device;
+               } else {
+#endif
+                       err = sdio_init_func(host->card, i + 1);
+                       if (err)
+                               goto remove;
+#ifdef CONFIG_MMC_EMBEDDED_SDIO
+               }
+#endif
        }
 
        mmc_release_host(host);

diff --git a/drivers/mmc/core/sdio_bus.c b/drivers/mmc/core/sdio_bus.c
index 233d0f9..189202f 100644 (file)
--- a/drivers/mmc/core/sdio_bus.c
+++ b/drivers/mmc/core/sdio_bus.c
@@ -20,6 +20,10 @@
 #include "sdio_cis.h"
 #include "sdio_bus.h"
 
+#ifdef CONFIG_MMC_EMBEDDED_SDIO
+#include <linux/mmc/host.h>
+#endif
+
 #define dev_to_sdio_func(d)    container_of(d, struct sdio_func, dev)
 #define to_sdio_driver(d)      container_of(d, struct sdio_driver, drv)
 
@@ -202,7 +206,14 @@ static void sdio_release_func(struct device *dev)
 {
        struct sdio_func *func = dev_to_sdio_func(dev);
 
-       sdio_free_func_cis(func);
+#ifdef CONFIG_MMC_EMBEDDED_SDIO
+       /*
+        * If this device is embedded then we never allocated
+        * cis tables for this func
+        */
+       if (!func->card->host->embedded_sdio_data.funcs)
+#endif
+               sdio_free_func_cis(func);
 
        if (func->info)
                kfree(func->info);

diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 9c288c9..6016dcb 100644 (file)
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -159,6 +159,15 @@ struct mmc_host {
 
        struct dentry           *debugfs_root;
 
+#ifdef CONFIG_MMC_EMBEDDED_SDIO
+       struct {
+               struct sdio_cis                 *cis;
+               struct sdio_cccr                *cccr;
+               struct sdio_embedded_func       *funcs;
+               int                             num_funcs;
+       } embedded_sdio_data;
+#endif
+
        unsigned long           private[0] ____cacheline_aligned;
 };
 
@@ -167,6 +176,14 @@ extern int mmc_add_host(struct mmc_host *);
 extern void mmc_remove_host(struct mmc_host *);
 extern void mmc_free_host(struct mmc_host *);
 
+#ifdef CONFIG_MMC_EMBEDDED_SDIO
+extern void mmc_set_embedded_sdio_data(struct mmc_host *host,
+                                      struct sdio_cis *cis,
+                                      struct sdio_cccr *cccr,
+                                      struct sdio_embedded_func *funcs,
+                                      int num_funcs);
+#endif
+
 static inline void *mmc_priv(struct mmc_host *host)
 {
        return (void *)host->private;

diff --git a/include/linux/mmc/sdio_func.h b/include/linux/mmc/sdio_func.h
index 07bee4a..5d6c88f 100644 (file)
--- a/include/linux/mmc/sdio_func.h
+++ b/include/linux/mmc/sdio_func.h
@@ -20,6 +20,14 @@ struct sdio_func;
 
 typedef void (sdio_irq_handler_t)(struct sdio_func *);
 
+/*
+ * Structure used to hold embedded SDIO device data from platform layer
+ */
+struct sdio_embedded_func {
+       uint8_t f_class;
+       uint32_t f_maxblksize;
+};
+
 /*
  * SDIO function CIS tuple (unknown to the core)
  */