From: San Mehat Date: Mon, 14 Apr 2008 22:22:49 +0000 (-0700) Subject: mmc: Add concept of an 'embedded' SDIO device. X-Git-Tag: firefly_0821_release~11726 X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=6558addc2ad78c412d6791544305256d5f90784c;p=firefly-linux-kernel-4.4.55.git 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 --- diff --git a/drivers/mmc/core/Kconfig b/drivers/mmc/core/Kconfig index 103be8895676..09a8766223af 100644 --- a/drivers/mmc/core/Kconfig +++ b/drivers/mmc/core/Kconfig @@ -14,11 +14,19 @@ 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. + 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 work-around for buggy controllers and hardware. Enable if you are experiencing issues with SD detection. - diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index 7dab2e5f4bc9..e543f85deb79 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -1312,6 +1312,22 @@ 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 cdb845b68ab5..f823bf793347 100644 --- 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 +#endif + static int sdio_read_fbr(struct sdio_func *func) { int ret; @@ -279,19 +283,35 @@ static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr, goto remove; } - /* - * Read the common registers. - */ - err = sdio_read_cccr(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 + /* + * Read the common registers. + */ + err = sdio_read_cccr(card); + 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 && @@ -518,6 +538,11 @@ int mmc_attach_sdio(struct mmc_host *host, u32 ocr) */ card->sdio_funcs = funcs = (ocr & 0x70000000) >> 28; +#ifdef CONFIG_MMC_EMBEDDED_SDIO + if (host->embedded_sdio_data.funcs) + card->sdio_funcs = funcs = host->embedded_sdio_data.num_funcs; +#endif + /* * If needed, disconnect card detection pull-up resistor. */ @@ -529,9 +554,27 @@ 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 d37464e296a5..0b1d2143ed23 100644 --- 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 +#endif + /* show configuration fields */ #define sdio_config_attr(field, format_string) \ static ssize_t \ @@ -199,7 +203,14 @@ 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/amba/mmci.h b/include/linux/amba/mmci.h index ee58a21b6075..2e4f1cf64f52 100644 --- a/include/linux/amba/mmci.h +++ b/include/linux/amba/mmci.h @@ -5,6 +5,15 @@ #define AMBA_MMCI_H #include +#include +#include + +struct embedded_sdio_data { + struct sdio_cis cis; + struct sdio_cccr cccr; + struct sdio_embedded_func *funcs; + int num_funcs; +}; struct mmci_platform_data { unsigned int ocr_mask; /* available voltages */ @@ -14,6 +23,7 @@ struct mmci_platform_data { int gpio_cd; unsigned long capabilities; 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 eaf36364b7d4..f59f2b268c0f 100644 --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -203,6 +203,15 @@ 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; }; @@ -211,6 +220,14 @@ 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 ac3ab683fec6..4121c20cbe74 100644 --- 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) */