[PATCH] mmc: sdhci: change sdhci-pltfm into a module

From: Shawn Guo
Date: Wed Jun 01 2011 - 22:53:10 EST

From: Shawn Guo <shawn.guo@xxxxxxxxxxxxx>

There are a couple of problems left from the sdhci pltfm and OF
consolidation changes.

* When building more than one sdhci-pltfm based drivers in the same
image, linker will give multiple definition error on the sdhci-pltfm
helper functions. For example right now, building sdhci-of-esdhc
and sdhci-of-hlwd together is a valid combination from Kconfig view.

* With the current build method, there is error with building the
drivers as module, but module installation fails with modprobe.

The patch fixes above problems by changing sdhci-pltfm into a module.
To avoid EXPORT_SYMBOL on so many big endian IO accessors, it moves
these accessors into sdhci-pltfm.h as the 'static inline' functions.
As a result, sdhci.h needs to be included in sdhci-pltfm.h, and in
turn can be removed from individual drivers which already include
sdhci-pltfm.h.

Signed-off-by: Shawn Guo <shawn.guo@xxxxxxxxxx>
---
drivers/mmc/host/Kconfig | 37 +++++++++++++----
drivers/mmc/host/Makefile | 7 +---
drivers/mmc/host/sdhci-cns3xxx.c | 1 -
drivers/mmc/host/sdhci-dove.c | 1 -
drivers/mmc/host/sdhci-esdhc-imx.c | 1 -
drivers/mmc/host/sdhci-of-esdhc.c | 1 -
drivers/mmc/host/sdhci-of-hlwd.c | 1 -
drivers/mmc/host/sdhci-pltfm.c | 82 ++++++++++-------------------------
drivers/mmc/host/sdhci-pltfm.h | 67 +++++++++++++++++++++++++----
drivers/mmc/host/sdhci-tegra.c | 1 -
10 files changed, 112 insertions(+), 87 deletions(-)

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index ee4ac77..74e77c9 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -81,19 +81,32 @@ config MMC_RICOH_MMC

If unsure, say Y.

-config MMC_SDHCI_OF_ESDHC
- bool "SDHCI OF support for the Freescale eSDHC controller"
+config MMC_SDHCI_PLTFM
+ tristate "SDHCI platform and OF driver helper"
depends on MMC_SDHCI
+ help
+ This selects the common helper functions support for Secure Digital
+ Host Controller Interface based platform and OF drivers.
+
+ If you have a controller with this interface, say Y or M here.
+
+ If unsure, say N.
+
+config MMC_SDHCI_OF_ESDHC
+ tristate "SDHCI OF support for the Freescale eSDHC controller"
+ depends on MMC_SDHCI_PLTFM
depends on PPC_OF
select MMC_SDHCI_BIG_ENDIAN_32BIT_BYTE_SWAPPER
help
This selects the Freescale eSDHC controller support.

+ If you have a controller with this interface, say Y or M here.
+
If unsure, say N.

config MMC_SDHCI_OF_HLWD
- bool "SDHCI OF support for the Nintendo Wii SDHCI controllers"
- depends on MMC_SDHCI
+ tristate "SDHCI OF support for the Nintendo Wii SDHCI controllers"
+ depends on MMC_SDHCI_PLTFM
depends on PPC_OF
select MMC_SDHCI_BIG_ENDIAN_32BIT_BYTE_SWAPPER
help
@@ -101,43 +114,51 @@ config MMC_SDHCI_OF_HLWD
found in the "Hollywood" chipset of the Nintendo Wii video game
console.

+ If you have a controller with this interface, say Y or M here.
+
If unsure, say N.

config MMC_SDHCI_CNS3XXX
tristate "SDHCI support on the Cavium Networks CNS3xxx SoC"
depends on ARCH_CNS3XXX
- depends on MMC_SDHCI
+ depends on MMC_SDHCI_PLTFM
help
This selects the SDHCI support for CNS3xxx System-on-Chip devices.

+ If you have a controller with this interface, say Y or M here.
+
If unsure, say N.

config MMC_SDHCI_ESDHC_IMX
tristate "SDHCI platform support for the Freescale eSDHC i.MX controller"
depends on ARCH_MX25 || ARCH_MX35 || ARCH_MX5
- depends on MMC_SDHCI
+ depends on MMC_SDHCI_PLTFM
select MMC_SDHCI_IO_ACCESSORS
help
This selects the Freescale eSDHC controller support on the platform
bus, found on platforms like mx35/51.

+ If you have a controller with this interface, say Y or M here.
+
If unsure, say N.

config MMC_SDHCI_DOVE
tristate "SDHCI support on Marvell's Dove SoC"
depends on ARCH_DOVE
- depends on MMC_SDHCI
+ depends on MMC_SDHCI_PLTFM
select MMC_SDHCI_IO_ACCESSORS
help
This selects the Secure Digital Host Controller Interface in
Marvell's Dove SoC.

+ If you have a controller with this interface, say Y or M here.
+
If unsure, say N.

config MMC_SDHCI_TEGRA
tristate "SDHCI platform support for the Tegra SD/MMC Controller"
depends on ARCH_TEGRA
- depends on MMC_SDHCI
+ depends on MMC_SDHCI_PLTFM
select MMC_SDHCI_IO_ACCESSORS
help
This selects the Tegra SD/MMC controller. If you have a Tegra
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index cbd89c3..bf479ab 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -44,18 +44,13 @@ obj-$(CONFIG_MMC_JZ4740) += jz4740_mmc.o
obj-$(CONFIG_MMC_VUB300) += vub300.o
obj-$(CONFIG_MMC_USHC) += ushc.o

+obj-$(CONFIG_MMC_SDHCI_PLTFM) += sdhci-pltfm.o
obj-$(CONFIG_MMC_SDHCI_CNS3XXX) += sdhci-cns3xxx.o
-sdhci-cns3xxx-objs := sdhci-pltfm.o
obj-$(CONFIG_MMC_SDHCI_ESDHC_IMX) += sdhci-esdhc-imx.o
-sdhci-esdhc-imx-objs := sdhci-pltfm.o
obj-$(CONFIG_MMC_SDHCI_DOVE) += sdhci-dove.o
-sdhci-dove-objs := sdhci-pltfm.o
obj-$(CONFIG_MMC_SDHCI_TEGRA) += sdhci-tegra.o
-sdhci-tegra-objs := sdhci-pltfm.o
obj-$(CONFIG_MMC_SDHCI_OF_ESDHC) += sdhci-of-esdhc.o
-sdhci-of-esdhc-objs := sdhci-pltfm.o
obj-$(CONFIG_MMC_SDHCI_OF_HLWD) += sdhci-of-hlwd.o
-sdhci-of-hlwd-objs := sdhci-pltfm.o

ifeq ($(CONFIG_CB710_DEBUG),y)
CFLAGS-cb710-mmc += -DDEBUG
diff --git a/drivers/mmc/host/sdhci-cns3xxx.c b/drivers/mmc/host/sdhci-cns3xxx.c
index 025d1a5..4b920b7 100644
--- a/drivers/mmc/host/sdhci-cns3xxx.c
+++ b/drivers/mmc/host/sdhci-cns3xxx.c
@@ -16,7 +16,6 @@
#include <linux/device.h>
#include <linux/mmc/host.h>
#include <mach/cns3xxx.h>
-#include "sdhci.h"
#include "sdhci-pltfm.h"

static unsigned int sdhci_cns3xxx_get_max_clk(struct sdhci_host *host)
diff --git a/drivers/mmc/host/sdhci-dove.c b/drivers/mmc/host/sdhci-dove.c
index 49aa533..f2d29dc 100644
--- a/drivers/mmc/host/sdhci-dove.c
+++ b/drivers/mmc/host/sdhci-dove.c
@@ -22,7 +22,6 @@
#include <linux/io.h>
#include <linux/mmc/host.h>

-#include "sdhci.h"
#include "sdhci-pltfm.h"

static u16 sdhci_dove_readw(struct sdhci_host *host, int reg)
diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index 3105bcf..248b8e5 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -22,7 +22,6 @@
#include <linux/mmc/sdio.h>
#include <mach/hardware.h>
#include <mach/esdhc.h>
-#include "sdhci.h"
#include "sdhci-pltfm.h"
#include "sdhci-esdhc.h"

diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
index fd7c2f5..b365f4f 100644
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -17,7 +17,6 @@
#include <linux/delay.h>
#include <linux/mmc/host.h>
#include "sdhci-pltfm.h"
-#include "sdhci.h"
#include "sdhci-esdhc.h"

static u16 esdhc_readw(struct sdhci_host *host, int reg)
diff --git a/drivers/mmc/host/sdhci-of-hlwd.c b/drivers/mmc/host/sdhci-of-hlwd.c
index faedfce..735be13 100644
--- a/drivers/mmc/host/sdhci-of-hlwd.c
+++ b/drivers/mmc/host/sdhci-of-hlwd.c
@@ -22,7 +22,6 @@
#include <linux/delay.h>
#include <linux/mmc/host.h>
#include "sdhci-pltfm.h"
-#include "sdhci.h"

/*
* Ops and quirks for the Nintendo Wii SDHCI controllers.
diff --git a/drivers/mmc/host/sdhci-pltfm.c b/drivers/mmc/host/sdhci-pltfm.c
index 041b0e2..71c0ce1 100644
--- a/drivers/mmc/host/sdhci-pltfm.c
+++ b/drivers/mmc/host/sdhci-pltfm.c
@@ -33,69 +33,11 @@
#ifdef CONFIG_PPC
#include <asm/machdep.h>
#endif
-#include "sdhci.h"
#include "sdhci-pltfm.h"

static struct sdhci_ops sdhci_pltfm_ops = {
};

-#ifdef CONFIG_MMC_SDHCI_BIG_ENDIAN_32BIT_BYTE_SWAPPER
-/*
- * These accessors are designed for big endian hosts doing I/O to
- * little endian controllers incorporating a 32-bit hardware byte swapper.
- */
-u32 sdhci_be32bs_readl(struct sdhci_host *host, int reg)
-{
- return in_be32(host->ioaddr + reg);
-}
-
-u16 sdhci_be32bs_readw(struct sdhci_host *host, int reg)
-{
- return in_be16(host->ioaddr + (reg ^ 0x2));
-}
-
-u8 sdhci_be32bs_readb(struct sdhci_host *host, int reg)
-{
- return in_8(host->ioaddr + (reg ^ 0x3));
-}
-
-void sdhci_be32bs_writel(struct sdhci_host *host, u32 val, int reg)
-{
- out_be32(host->ioaddr + reg, val);
-}
-
-void sdhci_be32bs_writew(struct sdhci_host *host, u16 val, int reg)
-{
- struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
- int base = reg & ~0x3;
- int shift = (reg & 0x2) * 8;
-
- switch (reg) {
- case SDHCI_TRANSFER_MODE:
- /*
- * Postpone this write, we must do it together with a
- * command write that is down below.
- */
- pltfm_host->xfer_mode_shadow = val;
- return;
- case SDHCI_COMMAND:
- sdhci_be32bs_writel(host,
- val << 16 | pltfm_host->xfer_mode_shadow,
- SDHCI_TRANSFER_MODE);
- return;
- }
- clrsetbits_be32(host->ioaddr + base, 0xffff << shift, val << shift);
-}
-
-void sdhci_be32bs_writeb(struct sdhci_host *host, u8 val, int reg)
-{
- int base = reg & ~0x3;
- int shift = (reg & 0x3) * 8;
-
- clrsetbits_be32(host->ioaddr + base , 0xff << shift, val << shift);
-}
-#endif /* CONFIG_MMC_SDHCI_BIG_ENDIAN_32BIT_BYTE_SWAPPER */
-
#ifdef CONFIG_OF
static bool sdhci_of_wp_inverted(struct device_node *np)
{
@@ -136,6 +78,7 @@ void sdhci_get_of_property(struct platform_device *pdev)
#else
void sdhci_get_of_property(struct platform_device *pdev) {}
#endif /* CONFIG_OF */
+EXPORT_SYMBOL_GPL(sdhci_get_of_property);

struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
struct sdhci_pltfm_data *pdata)
@@ -202,6 +145,7 @@ err:
dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
return ERR_PTR(ret);
}
+EXPORT_SYMBOL_GPL(sdhci_pltfm_init);

void sdhci_pltfm_free(struct platform_device *pdev)
{
@@ -213,6 +157,7 @@ void sdhci_pltfm_free(struct platform_device *pdev)
sdhci_free_host(host);
platform_set_drvdata(pdev, NULL);
}
+EXPORT_SYMBOL_GPL(sdhci_pltfm_free);

int sdhci_pltfm_register(struct platform_device *pdev,
struct sdhci_pltfm_data *pdata)
@@ -232,6 +177,7 @@ int sdhci_pltfm_register(struct platform_device *pdev,

return ret;
}
+EXPORT_SYMBOL_GPL(sdhci_pltfm_register);

int sdhci_pltfm_unregister(struct platform_device *pdev)
{
@@ -243,6 +189,7 @@ int sdhci_pltfm_unregister(struct platform_device *pdev)

return 0;
}
+EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);

#ifdef CONFIG_PM
int sdhci_pltfm_suspend(struct platform_device *dev, pm_message_t state)
@@ -251,6 +198,7 @@ int sdhci_pltfm_suspend(struct platform_device *dev, pm_message_t state)

return sdhci_suspend_host(host, state);
}
+EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend);

int sdhci_pltfm_resume(struct platform_device *dev)
{
@@ -258,4 +206,22 @@ int sdhci_pltfm_resume(struct platform_device *dev)

return sdhci_resume_host(host);
}
+EXPORT_SYMBOL_GPL(sdhci_pltfm_resume);
#endif /* CONFIG_PM */
+
+static int __init sdhci_pltfm_drv_init(void)
+{
+ pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
+
+ return 0;
+}
+module_init(sdhci_pltfm_drv_init);
+
+static void __exit sdhci_pltfm_drv_exit(void)
+{
+}
+module_exit(sdhci_pltfm_drv_exit);
+
+MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
+MODULE_AUTHOR("Intel Corporation");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/mmc/host/sdhci-pltfm.h b/drivers/mmc/host/sdhci-pltfm.h
index fd72694..3a9fc3f 100644
--- a/drivers/mmc/host/sdhci-pltfm.h
+++ b/drivers/mmc/host/sdhci-pltfm.h
@@ -12,9 +12,8 @@
#define _DRIVERS_MMC_SDHCI_PLTFM_H

#include <linux/clk.h>
-#include <linux/types.h>
#include <linux/platform_device.h>
-#include <linux/mmc/sdhci.h>
+#include "sdhci.h"

struct sdhci_pltfm_data {
struct sdhci_ops *ops;
@@ -31,13 +30,63 @@ struct sdhci_pltfm_host {
};

#ifdef CONFIG_MMC_SDHCI_BIG_ENDIAN_32BIT_BYTE_SWAPPER
-extern u32 sdhci_be32bs_readl(struct sdhci_host *host, int reg);
-extern u16 sdhci_be32bs_readw(struct sdhci_host *host, int reg);
-extern u8 sdhci_be32bs_readb(struct sdhci_host *host, int reg);
-extern void sdhci_be32bs_writel(struct sdhci_host *host, u32 val, int reg);
-extern void sdhci_be32bs_writew(struct sdhci_host *host, u16 val, int reg);
-extern void sdhci_be32bs_writeb(struct sdhci_host *host, u8 val, int reg);
-#endif
+/*
+ * These accessors are designed for big endian hosts doing I/O to
+ * little endian controllers incorporating a 32-bit hardware byte swapper.
+ */
+static inline u32 sdhci_be32bs_readl(struct sdhci_host *host, int reg)
+{
+ return in_be32(host->ioaddr + reg);
+}
+
+static inline u16 sdhci_be32bs_readw(struct sdhci_host *host, int reg)
+{
+ return in_be16(host->ioaddr + (reg ^ 0x2));
+}
+
+static inline u8 sdhci_be32bs_readb(struct sdhci_host *host, int reg)
+{
+ return in_8(host->ioaddr + (reg ^ 0x3));
+}
+
+static inline void sdhci_be32bs_writel(struct sdhci_host *host,
+ u32 val, int reg)
+{
+ out_be32(host->ioaddr + reg, val);
+}
+
+static inline void sdhci_be32bs_writew(struct sdhci_host *host,
+ u16 val, int reg)
+{
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ int base = reg & ~0x3;
+ int shift = (reg & 0x2) * 8;
+
+ switch (reg) {
+ case SDHCI_TRANSFER_MODE:
+ /*
+ * Postpone this write, we must do it together with a
+ * command write that is down below.
+ */
+ pltfm_host->xfer_mode_shadow = val;
+ return;
+ case SDHCI_COMMAND:
+ sdhci_be32bs_writel(host,
+ val << 16 | pltfm_host->xfer_mode_shadow,
+ SDHCI_TRANSFER_MODE);
+ return;
+ }
+ clrsetbits_be32(host->ioaddr + base, 0xffff << shift, val << shift);
+}
+
+static inline void sdhci_be32bs_writeb(struct sdhci_host *host, u8 val, int reg)
+{
+ int base = reg & ~0x3;
+ int shift = (reg & 0x3) * 8;
+
+ clrsetbits_be32(host->ioaddr + base , 0xff << shift, val << shift);
+}
+#endif /* CONFIG_MMC_SDHCI_BIG_ENDIAN_32BIT_BYTE_SWAPPER */

extern void sdhci_get_of_property(struct platform_device *pdev);

diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
index 1f66aca..18b0bd3 100644
--- a/drivers/mmc/host/sdhci-tegra.c
+++ b/drivers/mmc/host/sdhci-tegra.c
@@ -24,7 +24,6 @@
#include <mach/gpio.h>
#include <mach/sdhci.h>

-#include "sdhci.h"
#include "sdhci-pltfm.h"

static u32 tegra_sdhci_readl(struct sdhci_host *host, int reg)
--
1.7.4.1


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