From c49bfa4677fc1f161330165657122375d46c71d1 Mon Sep 17 00:00:00 2001
From: Radek Polak <psonek2@seznam.cz>
Date: Fri, 9 Apr 2010 09:22:23 +0200
Subject: [PATCH 14/17] save_regs.patch

With this patch wifi can survive suspend.
---
 drivers/mmc/core/core.c   |    3 +-
 drivers/mmc/host/s3cmci.c |   46 +++++++++++++++++++++++++++++++++++++++++++-
 drivers/mmc/host/s3cmci.h |    8 +++++++
 include/linux/mmc/core.h  |    2 +
 4 files changed, 56 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 3168ebd..8504458 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -75,10 +75,11 @@ 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
diff --git a/drivers/mmc/host/s3cmci.c b/drivers/mmc/host/s3cmci.c
index 2fdf768..5f3effc 100644
--- a/drivers/mmc/host/s3cmci.c
+++ b/drivers/mmc/host/s3cmci.c
@@ -1878,19 +1878,61 @@ MODULE_DEVICE_TABLE(platform, s3cmci_driver_ids);
 
 #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 device *dev)
 {
 	struct mmc_host *mmc = platform_get_drvdata(to_platform_device(dev));
 	struct pm_message event = { PM_EVENT_SUSPEND };
 
-	return mmc_suspend_host(mmc, event);
+	return save_regs(mmc);
 }
 
 static int s3cmci_resume(struct device *dev)
 {
 	struct mmc_host *mmc = platform_get_drvdata(to_platform_device(dev));
 
-	return mmc_resume_host(mmc);
+	return restore_regs(mmc);
 }
 
 static const struct dev_pm_ops s3cmci_pm = {
diff --git a/drivers/mmc/host/s3cmci.h b/drivers/mmc/host/s3cmci.h
index c76b53d..551e715 100644
--- a/drivers/mmc/host/s3cmci.h
+++ b/drivers/mmc/host/s3cmci.h
@@ -8,6 +8,8 @@
  * published by the Free Software Foundation.
  */
 
+#include <mach/regs-sdi.h>
+
 enum s3cmci_waitfor {
 	COMPLETION_NONE,
 	COMPLETION_FINALIZE,
@@ -27,6 +29,12 @@ struct s3cmci_host {
 	int			irq;
 	int			irq_cd;
 	int			dma;
+       /*
+        * 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];
 
 	unsigned long		clk_rate;
 	unsigned long		clk_div;
diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
index e4898e9..b49d674 100644
--- 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 *,
-- 
1.7.3