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275 lines
7.4 KiB
Diff
275 lines
7.4 KiB
Diff
From 62d51f0d0d0b3c758b4505c3855b61288b8e90aa Mon Sep 17 00:00:00 2001
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From: San Mehat <san@android.com>
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Date: Mon, 14 Apr 2008 15:22:49 -0700
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Subject: [PATCH 095/134] mmc: Add concept of an 'embedded' SDIO device.
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This is required to support chips which use SDIO for signaling/
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communication but do not implement the various card enumeration registers
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as required for full SD / SDIO cards.
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mmc: sdio: Fix bug where we're freeing the CIS tables we never allocated when using EMBEDDED_SDIO
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mmc: Add max_blksize to embedded SDIO data
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Signed-off-by: San Mehat <san@google.com>
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---
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arch/arm/include/asm/mach/mmc.h | 10 ++++++
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drivers/mmc/core/Kconfig | 10 +++++-
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drivers/mmc/core/core.c | 16 +++++++++
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drivers/mmc/core/sdio.c | 67 ++++++++++++++++++++++++++++++++-------
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drivers/mmc/core/sdio_bus.c | 13 +++++++-
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include/linux/mmc/host.h | 17 ++++++++++
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include/linux/mmc/sdio_func.h | 8 +++++
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7 files changed, 127 insertions(+), 14 deletions(-)
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--- a/arch/arm/include/asm/mach/mmc.h
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+++ b/arch/arm/include/asm/mach/mmc.h
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@@ -5,12 +5,22 @@
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#define ASMARM_MACH_MMC_H
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#include <linux/mmc/host.h>
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+#include <linux/mmc/card.h>
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+#include <linux/mmc/sdio_func.h>
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+
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+struct embedded_sdio_data {
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+ struct sdio_cis cis;
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+ struct sdio_cccr cccr;
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+ struct sdio_embedded_func *funcs;
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+ int num_funcs;
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+};
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struct mmc_platform_data {
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unsigned int ocr_mask; /* available voltages */
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u32 (*translate_vdd)(struct device *, unsigned int);
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unsigned int (*status)(struct device *);
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unsigned int status_irq;
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+ struct embedded_sdio_data *embedded_sdio;
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int (*register_status_notify)(void (*callback)(int card_present, void *dev_id), void *dev_id);
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};
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--- a/drivers/mmc/core/Kconfig
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+++ b/drivers/mmc/core/Kconfig
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@@ -14,11 +14,19 @@ config MMC_UNSAFE_RESUME
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This option is usually just for embedded systems which use
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a MMC/SD card for rootfs. Most people should say N here.
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+config MMC_EMBEDDED_SDIO
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+ boolean "MMC embedded SDIO device support (EXPERIMENTAL)"
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+ depends on EXPERIMENTAL
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+ help
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+ If you say Y here, support will be added for embedded SDIO
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+ devices which do not contain the necessary enumeration
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+ support in hardware to be properly detected.
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+
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config MMC_PARANOID_SD_INIT
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bool "Enable paranoid SD card initialization (EXPERIMENTAL)"
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+ depends on EXPERIMENTAL
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help
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If you say Y here, the MMC layer will be extra paranoid
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about re-trying SD init requests. This can be a useful
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work-around for buggy controllers and hardware. Enable
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if you are experiencing issues with SD detection.
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-
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--- a/drivers/mmc/core/core.c
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+++ b/drivers/mmc/core/core.c
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@@ -1011,6 +1011,22 @@ EXPORT_SYMBOL(mmc_resume_host);
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#endif
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+#ifdef CONFIG_MMC_EMBEDDED_SDIO
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+void mmc_set_embedded_sdio_data(struct mmc_host *host,
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+ struct sdio_cis *cis,
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+ struct sdio_cccr *cccr,
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+ struct sdio_embedded_func *funcs,
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+ int num_funcs)
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+{
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+ host->embedded_sdio_data.cis = cis;
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+ host->embedded_sdio_data.cccr = cccr;
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+ host->embedded_sdio_data.funcs = funcs;
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+ host->embedded_sdio_data.num_funcs = num_funcs;
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+}
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+
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+EXPORT_SYMBOL(mmc_set_embedded_sdio_data);
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+#endif
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+
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static int __init mmc_init(void)
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{
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int ret;
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--- a/drivers/mmc/core/sdio.c
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+++ b/drivers/mmc/core/sdio.c
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@@ -24,6 +24,10 @@
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#include "sdio_ops.h"
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#include "sdio_cis.h"
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+#ifdef CONFIG_MMC_EMBEDDED_SDIO
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+#include <linux/mmc/sdio_ids.h>
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+#endif
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+
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static int sdio_read_fbr(struct sdio_func *func)
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{
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int ret;
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@@ -314,6 +318,11 @@ int mmc_attach_sdio(struct mmc_host *hos
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*/
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funcs = (ocr & 0x70000000) >> 28;
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+#ifdef CONFIG_MMC_EMBEDDED_SDIO
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+ if (host->embedded_sdio_data.funcs)
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+ funcs = host->embedded_sdio_data.num_funcs;
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+#endif
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+
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/*
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* Allocate card structure.
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*/
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@@ -351,17 +360,33 @@ int mmc_attach_sdio(struct mmc_host *hos
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/*
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* Read the common registers.
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*/
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- err = sdio_read_cccr(card);
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- if (err)
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- goto remove;
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- /*
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- * Read the common CIS tuples.
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- */
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- err = sdio_read_common_cis(card);
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- if (err)
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- goto remove;
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+#ifdef CONFIG_MMC_EMBEDDED_SDIO
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+ if (host->embedded_sdio_data.cccr)
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+ memcpy(&card->cccr, host->embedded_sdio_data.cccr, sizeof(struct sdio_cccr));
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+ else {
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+#endif
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+ err = sdio_read_cccr(card);
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+ if (err)
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+ goto remove;
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+#ifdef CONFIG_MMC_EMBEDDED_SDIO
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+ }
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+#endif
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+#ifdef CONFIG_MMC_EMBEDDED_SDIO
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+ if (host->embedded_sdio_data.cis)
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+ memcpy(&card->cis, host->embedded_sdio_data.cis, sizeof(struct sdio_cis));
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+ else {
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+#endif
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+ /*
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+ * Read the common CIS tuples.
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+ */
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+ err = sdio_read_common_cis(card);
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+ if (err)
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+ goto remove;
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+#ifdef CONFIG_MMC_EMBEDDED_SDIO
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+ }
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+#endif
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/*
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* Switch to high-speed (if supported).
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*/
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@@ -395,9 +420,27 @@ int mmc_attach_sdio(struct mmc_host *hos
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* Initialize (but don't add) all present functions.
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*/
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for (i = 0;i < funcs;i++) {
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- err = sdio_init_func(host->card, i + 1);
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- if (err)
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- goto remove;
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+#ifdef CONFIG_MMC_EMBEDDED_SDIO
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+ if (host->embedded_sdio_data.funcs) {
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+ struct sdio_func *tmp;
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+
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+ tmp = sdio_alloc_func(host->card);
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+ if (IS_ERR(tmp))
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+ goto remove;
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+ tmp->num = (i + 1);
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+ card->sdio_func[i] = tmp;
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+ tmp->class = host->embedded_sdio_data.funcs[i].f_class;
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+ tmp->max_blksize = host->embedded_sdio_data.funcs[i].f_maxblksize;
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+ tmp->vendor = card->cis.vendor;
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+ tmp->device = card->cis.device;
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+ } else {
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+#endif
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+ err = sdio_init_func(host->card, i + 1);
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+ if (err)
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+ goto remove;
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+#ifdef CONFIG_MMC_EMBEDDED_SDIO
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+ }
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+#endif
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}
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mmc_release_host(host);
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--- a/drivers/mmc/core/sdio_bus.c
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+++ b/drivers/mmc/core/sdio_bus.c
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@@ -20,6 +20,10 @@
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#include "sdio_cis.h"
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#include "sdio_bus.h"
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+#ifdef CONFIG_MMC_EMBEDDED_SDIO
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+#include <linux/mmc/host.h>
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+#endif
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+
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#define dev_to_sdio_func(d) container_of(d, struct sdio_func, dev)
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#define to_sdio_driver(d) container_of(d, struct sdio_driver, drv)
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@@ -202,7 +206,14 @@ static void sdio_release_func(struct dev
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{
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struct sdio_func *func = dev_to_sdio_func(dev);
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- sdio_free_func_cis(func);
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+#ifdef CONFIG_MMC_EMBEDDED_SDIO
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+ /*
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+ * If this device is embedded then we never allocated
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+ * cis tables for this func
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+ */
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+ if (!func->card->host->embedded_sdio_data.funcs)
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+#endif
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+ sdio_free_func_cis(func);
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if (func->info)
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kfree(func->info);
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--- a/include/linux/mmc/host.h
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+++ b/include/linux/mmc/host.h
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@@ -161,6 +161,15 @@ struct mmc_host {
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struct dentry *debugfs_root;
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+#ifdef CONFIG_MMC_EMBEDDED_SDIO
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+ struct {
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+ struct sdio_cis *cis;
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+ struct sdio_cccr *cccr;
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+ struct sdio_embedded_func *funcs;
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+ int num_funcs;
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+ } embedded_sdio_data;
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+#endif
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+
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unsigned long private[0] ____cacheline_aligned;
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};
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@@ -169,6 +178,14 @@ extern int mmc_add_host(struct mmc_host
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extern void mmc_remove_host(struct mmc_host *);
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extern void mmc_free_host(struct mmc_host *);
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+#ifdef CONFIG_MMC_EMBEDDED_SDIO
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+extern void mmc_set_embedded_sdio_data(struct mmc_host *host,
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+ struct sdio_cis *cis,
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+ struct sdio_cccr *cccr,
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+ struct sdio_embedded_func *funcs,
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+ int num_funcs);
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+#endif
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+
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static inline void *mmc_priv(struct mmc_host *host)
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{
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return (void *)host->private;
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--- a/include/linux/mmc/sdio_func.h
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+++ b/include/linux/mmc/sdio_func.h
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@@ -21,6 +21,14 @@ struct sdio_func;
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typedef void (sdio_irq_handler_t)(struct sdio_func *);
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/*
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+ * Structure used to hold embedded SDIO device data from platform layer
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+ */
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+struct sdio_embedded_func {
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+ uint8_t f_class;
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+ uint32_t f_maxblksize;
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+};
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+
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+/*
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* SDIO function CIS tuple (unknown to the core)
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*/
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struct sdio_func_tuple {
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