openwrt-xburst/target/linux/s3c24xx/patches-2.6.31/200-s3c-mci.patch

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index d84c880..3e79f43 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -59,10 +59,11 @@ static int mmc_schedule_delayed_work(struct delayed_work *work,
 /*
  * Internal function. Flush all scheduled work from the MMC work queue.
  */
-static void mmc_flush_scheduled_work(void)
+void mmc_flush_scheduled_work(void)
 {
 	flush_workqueue(workqueue);
 }
+EXPORT_SYMBOL_GPL(mmc_flush_scheduled_work);
 
 /**
  *	mmc_request_done - finish processing an MMC request
--- a/include/linux/mmc/core.h
+++ b/include/linux/mmc/core.h
@@ -129,6 +129,8 @@ struct mmc_request {
 struct mmc_host;
 struct mmc_card;
 
+extern void mmc_flush_scheduled_work(void);
+
 extern void mmc_wait_for_req(struct mmc_host *, struct mmc_request *);
 extern int mmc_wait_for_cmd(struct mmc_host *, struct mmc_command *, int);
 extern int mmc_wait_for_app_cmd(struct mmc_host *, struct mmc_card *,
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 891ef18..fa1889a 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -55,6 +55,18 @@ config MMC_SDHCI_PCI
 
 	  If unsure, say N.
 
+config MMC_SDHCI_S3C
+	tristate "SDHCI support on Samsung S3C SoC"
+	depends on MMC_SDHCI && PLAT_S3C24XX
+	help
+	  This selects the Secure Digital Host Controller Interface (SDHCI)
+	  often referrered to as the HSMMC block in some of the Samsung S3C
+	  range of SoC.
+
+	  If you have a controller with this interface, say Y or M here.
+
+	  If unsure, say N.
+
 config MMC_RICOH_MMC
 	tristate "Ricoh MMC Controller Disabler  (EXPERIMENTAL)"
 	depends on MMC_SDHCI_PCI
diff --git a/arch/arm/plat-s3c/include/plat/sdhci.h b/arch/arm/plat-s3c/include/plat/sdhci.h
index f615308..570da2d 100644
--- a/arch/arm/plat-s3c/include/plat/sdhci.h
+++ b/arch/arm/plat-s3c/include/plat/sdhci.h
@@ -29,6 +29,7 @@ struct mmc_ios;
  *            is necessary the controllers and/or GPIO blocks require the
  *	      changing of driver-strength and other controls dependant on
  *	      the card and speed of operation.
+ * sdhci_host: Pointer kept during init, allows presence change notification
  *
  * Initialisation data specific to either the machine or the platform
  * for the device driver to use or call-back when configuring gpio or
@@ -45,8 +46,11 @@ struct s3c_sdhci_platdata {
 			    void __iomem *regbase,
 			    struct mmc_ios *ios,
 			    struct mmc_card *card);
+	struct sdhci_host * sdhci_host;
 };
 
+extern void sdhci_s3c_force_presence_change(struct platform_device *pdev);
+
 /**
  * s3c_sdhci0_set_platdata - Set platform data for S3C SDHCI device.
  * @pd: Platform data to register to device.
--- /dev/null
+++ b/arch/arm/mach-s3c2410/include/mach/mci.h
@@ -0,0 +1,13 @@
+#ifndef _ARCH_MCI_H
+#define _ARCH_MCI_H
+
+struct s3c24xx_mci_pdata {
+	unsigned int	gpio_detect;
+	unsigned int	gpio_wprotect;
+	unsigned long	ocr_avail;
+	unsigned int	do_dma;
+	void		(*set_power)(unsigned char power_mode,
+				     unsigned short vdd);
+};
+
+#endif /* _ARCH_NCI_H */
diff --git a/arch/arm/mach-s3c2440/s3c2440.c b/arch/arm/mach-s3c2440/s3c2440.c
index ac1f7ea..f7f8f31 100644
--- a/arch/arm/mach-s3c2440/s3c2440.c
+++ b/arch/arm/mach-s3c2440/s3c2440.c
@@ -46,6 +46,9 @@ int __init s3c2440_init(void)
 	s3c_device_wdt.resource[1].start = IRQ_S3C2440_WDT;
 	s3c_device_wdt.resource[1].end   = IRQ_S3C2440_WDT;
 
+	/* make sure SD/MMC driver can distinguish 2440 from 2410 */
+	s3c_device_sdi.name = "s3c2440-sdi";
+
 	/* register our system device for everything else */
 
 	return sysdev_register(&s3c2440_sysdev);
diff --git a/arch/arm/mach-s3c2442/s3c2442.c b/arch/arm/mach-s3c2442/s3c2442.c
index 4663bdc..9602d57 100644
--- a/arch/arm/mach-s3c2442/s3c2442.c
+++ b/arch/arm/mach-s3c2442/s3c2442.c
@@ -21,6 +21,7 @@
 
 #include <plat/s3c2442.h>
 #include <plat/cpu.h>
+#include <plat/devs.h>
 
 static struct sys_device s3c2442_sysdev = {
 	.cls		= &s3c2442_sysclass,
@@ -30,5 +31,8 @@ int __init s3c2442_init(void)
 {
 	printk("S3C2442: Initialising architecture\n");
 
+	/* make sure SD/MMC driver can distinguish 2440 from 2410 */
+	s3c_device_sdi.name = "s3c2440-sdi";
+
 	return sysdev_register(&s3c2442_sysdev);
 }
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index cf153f6..c25f464 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -13,6 +13,7 @@ endif
 obj-$(CONFIG_MMC_MXC)		+= mxcmmc.o
 obj-$(CONFIG_MMC_SDHCI)		+= sdhci.o
 obj-$(CONFIG_MMC_SDHCI_PCI)	+= sdhci-pci.o
+obj-$(CONFIG_MMC_SDHCI_S3C)	+= sdhci-s3c.o
 obj-$(CONFIG_MMC_RICOH_MMC)	+= ricoh_mmc.o
 obj-$(CONFIG_MMC_SDHCI_OF)	+= sdhci-of.o
 obj-$(CONFIG_MMC_SDHCI_PLTFM)	+= sdhci-pltfm.o
diff --git a/drivers/mmc/host/s3cmci.h b/drivers/mmc/host/s3cmci.h
index ca1ba3d..7f80047 100644
--- a/drivers/mmc/host/s3cmci.h
+++ b/drivers/mmc/host/s3cmci.h
@@ -8,6 +8,10 @@
  * published by the Free Software Foundation.
  */
 
+
+#include <mach/regs-sdi.h>
+#include <linux/regulator/consumer.h>
+
 /* FIXME: DMA Resource management ?! */
 #define S3CMCI_DMA 0
 
@@ -68,7 +72,16 @@ struct s3cmci_host {
 	unsigned int		ccnt, dcnt;
 	struct tasklet_struct	pio_tasklet;
 
+	/*
+	 * Here's where we save the registers during suspend. Note that we skip
+	 * SDIDATA, which is at different positions on 2410 and 2440, so
+	 * there's no "+1" in the array size.
+	 */
+	u32			saved[(S3C2410_SDIIMSK-S3C2410_SDICON)/4];
+
 #ifdef CONFIG_CPU_FREQ
 	struct notifier_block	freq_transition;
 #endif
+
+	struct regulator *regulator;
 };
diff --git a/drivers/mmc/host/s3cmci.c b/drivers/mmc/host/s3cmci.c
index 8c08cd7..b3cded4 100644
--- a/drivers/mmc/host/s3cmci.c
+++ b/drivers/mmc/host/s3cmci.c
@@ -2,6 +2,7 @@
  *  linux/drivers/mmc/s3cmci.h - Samsung S3C MCI driver
  *
  *  Copyright (C) 2004-2006 maintech GmbH, Thomas Kleffel <tk@maintech.de>
+ *  Copyright (C) 2007 Harald Welte <laforge@gnumonks.org>
  *
  * Current driver maintained by Ben Dooks and Simtec Electronics
  *  Copyright (C) 2008 Simtec Electronics <ben-linux@fluff.org>
@@ -25,9 +26,18 @@
 
 #include <mach/regs-sdi.h>
 #include <mach/regs-gpio.h>
+#include <mach/hardware.h>
 
 #include <plat/mci.h>
 
+#include <asm/dma.h>
+#include <asm/dma-mapping.h>
+
+#include <asm/io.h>
+#include <mach/regs-gpio.h>
+#include <mach/mci.h>
+#include <mach/dma.h>
+
 #include "s3cmci.h"
 
 #define DRIVER_NAME "s3c-mci"
@@ -48,6 +58,9 @@ static const int dbgmap_err   = dbg_fail;
 static const int dbgmap_info  = dbg_info | dbg_conf;
 static const int dbgmap_debug = dbg_err | dbg_debug;
 
+static int f_max = -1; /* override maximum frequency limit */
+static int persist; /* keep interface alive across suspend/resume */
+
 #define dbg(host, channels, args...)		  \
 	do {					  \
 	if (dbgmap_err & channels) 		  \
@@ -281,8 +294,11 @@ static void do_pio_read(struct s3cmci_host *host)
 		 * an even multiple of 4. */
 		if (fifo >= host->pio_bytes)
 			fifo = host->pio_bytes;
-		else
+		else {
 			fifo -= fifo & 3;
+			if (!fifo)
+				break;
+		}
 
 		host->pio_bytes -= fifo;
 		host->pio_count += fifo;
@@ -330,7 +346,7 @@ static void do_pio_write(struct s3cmci_host *host)
 
 	to_ptr = host->base + host->sdidata;
 
-	while ((fifo = fifo_free(host)) > 3) {
+	while ((fifo = fifo_free(host))) {
 		if (!host->pio_bytes) {
 			res = get_data_buffer(host, &host->pio_bytes,
 							&host->pio_ptr);
@@ -354,8 +370,11 @@ static void do_pio_write(struct s3cmci_host *host)
 		 * words, so round down to an even multiple of 4. */
 		if (fifo >= host->pio_bytes)
 			fifo = host->pio_bytes;
-		else
+		else {
 			fifo -= fifo & 3;
+			if (!fifo)
+				break;
+		}
 
 		host->pio_bytes -= fifo;
 		host->pio_count += fifo;
@@ -374,7 +393,6 @@ static void pio_tasklet(unsigned long data)
 {
 	struct s3cmci_host *host = (struct s3cmci_host *) data;
 
-
 	disable_irq(host->irq);
 
 	if (host->pio_active == XFER_WRITE)
@@ -615,7 +633,6 @@ irq_out:
 
 	spin_unlock_irqrestore(&host->complete_lock, iflags);
 	return IRQ_HANDLED;
-
 }
 
 /*
@@ -1027,6 +1044,7 @@ static void s3cmci_send_request(struct mmc_host *mmc)
 			dbg(host, dbg_err, "data prepare error %d\n", res);
 			cmd->error = res;
 			cmd->data->error = res;
+			cmd->data->error = -EIO;
 
 			mmc_request_done(mmc, mrq);
 			return;
@@ -1264,10 +1282,8 @@ static int __devinit s3cmci_probe(struct platform_device *pdev, int is2440)
 	host->is2440	= is2440;
 
 	host->pdata = pdev->dev.platform_data;
-	if (!host->pdata) {
-		pdev->dev.platform_data = &s3cmci_def_pdata;
+	if (!host->pdata)
 		host->pdata = &s3cmci_def_pdata;
-	}
 
 	spin_lock_init(&host->complete_lock);
 	tasklet_init(&host->pio_tasklet, pio_tasklet, (unsigned long) host);
@@ -1380,6 +1396,18 @@ static int __devinit s3cmci_probe(struct platform_device *pdev, int is2440)
 	mmc->f_min 	= host->clk_rate / (host->clk_div * 256);
 	mmc->f_max 	= host->clk_rate / host->clk_div;
 
+	if (f_max >= 0) {
+		unsigned f = f_max;
+
+		if (f < mmc->f_min)
+			f = mmc->f_min;
+		if (mmc->f_max > f) {
+			dev_info(&pdev->dev, "f_max lowered from %u to %u Hz\n",
+			    mmc->f_max, f);
+			mmc->f_max = f;
+		}
+	}
+
 	if (host->pdata->ocr_avail)
 		mmc->ocr_avail = host->pdata->ocr_avail;
 
@@ -1492,18 +1520,60 @@ static int __devinit s3cmci_2440_probe(struct platform_device *dev)
 
 #ifdef CONFIG_PM
 
+static int save_regs(struct mmc_host *mmc)
+{
+	struct s3cmci_host *host = mmc_priv(mmc);
+	unsigned long flags;
+	unsigned from;
+	u32 *to = host->saved;
+
+	mmc_flush_scheduled_work();
+
+	local_irq_save(flags);
+	for (from = S3C2410_SDICON; from != S3C2410_SDIIMSK+4; from += 4)
+		if (from != host->sdidata)
+			*to++ = readl(host->base + from);
+	BUG_ON(to-host->saved != ARRAY_SIZE(host->saved));
+	local_irq_restore(flags);
+
+	return 0;
+}
+
+static int restore_regs(struct mmc_host *mmc)
+{
+	struct s3cmci_host *host = mmc_priv(mmc);
+	unsigned long flags;
+	unsigned to;
+	u32 *from = host->saved;
+
+	/*
+	 * Before we begin with the necromancy, make sure we don't
+	 * inadvertently start something we'll regret microseconds later.
+	 */
+	from[S3C2410_SDICMDCON - S3C2410_SDICON] = 0;
+
+	local_irq_save(flags);
+	for (to = S3C2410_SDICON; to != S3C2410_SDIIMSK+4; to += 4)
+		if (to != host->sdidata)
+			writel(*from++, host->base + to);
+	BUG_ON(from-host->saved != ARRAY_SIZE(host->saved));
+	local_irq_restore(flags);
+
+	return 0;
+}
+
 static int s3cmci_suspend(struct platform_device *dev, pm_message_t state)
 {
 	struct mmc_host *mmc = platform_get_drvdata(dev);
 
-	return  mmc_suspend_host(mmc, state);
+	return persist ? save_regs(mmc) : mmc_suspend_host(mmc, state);
 }
 
 static int s3cmci_resume(struct platform_device *dev)
 {
 	struct mmc_host *mmc = platform_get_drvdata(dev);
 
-	return mmc_resume_host(mmc);
+	return persist ? restore_regs(mmc) : mmc_resume_host(mmc);
 }
 
 #else /* CONFIG_PM */
@@ -1561,9 +1631,13 @@ static void __exit s3cmci_exit(void)
 module_init(s3cmci_init);
 module_exit(s3cmci_exit);
 
+module_param(f_max, int, 0644);
+module_param(persist, int, 0644);
+
 MODULE_DESCRIPTION("Samsung S3C MMC/SD Card Interface driver");
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Thomas Kleffel <tk@maintech.de>, Ben Dooks <ben-linux@fluff.org>");
 MODULE_ALIAS("platform:s3c2410-sdi");
 MODULE_ALIAS("platform:s3c2412-sdi");
 MODULE_ALIAS("platform:s3c2440-sdi");
+