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

Change-Id: Ibff2e3e991e5522f55ec8c6edc25ed09f2553736
Signed-off-by: San Mehat <san@google.com>

diff --git a/drivers/mmc/core/Kconfig b/drivers/mmc/core/Kconfig
index 319c68d7b0f4ab5721dcf2095db437020f884655..a10e583950ee2938abbd7a10a2783cd0f34f884e 100644 (file)
--- a/drivers/mmc/core/Kconfig
+++ b/drivers/mmc/core/Kconfig
@@ -2,8 +2,17 @@
 # MMC core configuration
 #
 
+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.
+
 config MMC_PARANOID_SD_INIT
        bool "Enable paranoid SD card initialization (EXPERIMENTAL)"
+       depends on EXPERIMENTAL
        help
          If you say Y here, the MMC layer will be extra paranoid
          about re-trying SD init requests. This can be a useful

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 5ae89e48fd85b575cf743363b3a298b49872b7db..1e2e1a8f8872e26c7b84d2b4db9dd542a2d843fe 100644 (file)
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -2832,6 +2832,22 @@ void mmc_init_context_info(struct mmc_host *host)
        init_waitqueue_head(&host->context_info.wait);
 }
 
+#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 16d838e6d623be3968a7a900e85348d17a642fe3..444a6cbb55b96a2fa6b305a6872ea78fc6be4ab3 100644 (file)
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -28,6 +28,10 @@
 #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;
@@ -699,19 +703,35 @@ try_again:
                goto finish;
        }
 
-       /*
-        * Read the common registers.
-        */
-       err = sdio_read_cccr(card, ocr);
-       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
+               /*
+                * Read the common registers.
+                */
+               err = sdio_read_cccr(card,  ocr);
+               if (err)
+                       goto remove;
+#ifdef CONFIG_MMC_EMBEDDED_SDIO
+       }
+#endif
 
-       /*
-        * 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.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
 
        if (oldcard) {
                int same = (card->cis.vendor == oldcard->cis.vendor &&
@@ -1120,14 +1140,36 @@ int mmc_attach_sdio(struct mmc_host *host)
        funcs = (ocr & 0x70000000) >> 28;
        card->sdio_funcs = 0;
 
+#ifdef CONFIG_MMC_EMBEDDED_SDIO
+       if (host->embedded_sdio_data.funcs)
+               card->sdio_funcs = funcs = host->embedded_sdio_data.num_funcs;
+#endif
+
        /*
         * Initialize (but don't add) all present functions.
         */
        for (i = 0; i < funcs; i++, card->sdio_funcs++) {
-               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
                /*
                 * Enable Runtime PM for this func (if supported)
                 */

diff --git a/drivers/mmc/core/sdio_bus.c b/drivers/mmc/core/sdio_bus.c
index 7e327a6dd53da304cc59b9012e311504bfaf67df..e32ed3d28b067e79516e0e51dc64d2247fd5604f 100644 (file)
--- a/drivers/mmc/core/sdio_bus.c
+++ b/drivers/mmc/core/sdio_bus.c
@@ -28,6 +28,10 @@
 #include "sdio_cis.h"
 #include "sdio_bus.h"
 
+#ifdef CONFIG_MMC_EMBEDDED_SDIO
+#include <linux/mmc/host.h>
+#endif
+
 #define to_sdio_driver(d)      container_of(d, struct sdio_driver, drv)
 
 /* show configuration fields */
@@ -263,7 +267,14 @@ 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);
 
        kfree(func->info);
 

diff --git a/include/linux/amba/mmci.h b/include/linux/amba/mmci.h
index 0fbd47eddf20512b91d441ae1fbbe143ca35dbcf..8bfd21c13d595a10b304d4af9f1fed046e4f79d2 100644 (file)
--- a/include/linux/amba/mmci.h
+++ b/include/linux/amba/mmci.h
@@ -5,6 +5,15 @@
 #define AMBA_MMCI_H
 
 #include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/sdio_func.h>
+
+struct embedded_sdio_data {
+        struct sdio_cis cis;
+        struct sdio_cccr cccr;
+        struct sdio_embedded_func *funcs;
+        int num_funcs;
+};
 
 /**
  * struct mmci_platform_data - platform configuration for the MMCI
@@ -32,6 +41,7 @@ struct mmci_platform_data {
        int     gpio_cd;
        bool    cd_invert;
        unsigned int status_irq;
+       struct embedded_sdio_data *embedded_sdio;
        int (*register_status_notify)(void (*callback)(int card_present, void *dev_id), void *dev_id);
 
 };

diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 8673ffe3d86ef83fc657cde31a43058b94840f61..40025b28c1fb668dbc9e78d8f7924d1774a825c5 100644 (file)
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -370,6 +370,15 @@ struct mmc_host {
        int                     dsr_req;        /* DSR value is valid */
        u32                     dsr;    /* optional driver stage (DSR) value */
 
+#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;
 };
 
@@ -379,6 +388,14 @@ void mmc_remove_host(struct mmc_host *);
 void mmc_free_host(struct mmc_host *);
 int mmc_of_parse(struct mmc_host *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 aab032a6ae6124de63b7934f49d0dc564b0d2dc3..2e5e4baaf5ac3136f0be4967d2821176f8222a62 100644 (file)
--- a/include/linux/mmc/sdio_func.h
+++ b/include/linux/mmc/sdio_func.h
@@ -22,6 +22,14 @@ 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)
  */