Merge tag 'tegra-for-3.7-dmaengine' of git://git.kernel.org/pub/scm/linux/kernel/git/swarren/linux-tegra into next/cleanup

ARM: tegra: switch to dmaengine

The Tegra code-base has contained both a legacy DMA and a dmaengine
driver since v3.6-rcX. This series flips Tegra's defconfig to enable
dmaengine rather than the legacy driver, and removes the legacy driver
and all client code.

* tag 'tegra-for-3.7-dmaengine' of git://git.kernel.org/pub/scm/linux/kernel/git/swarren/linux-tegra:
  ASoC: tegra: remove support of legacy DMA driver based access
  spi: tegra: remove support of legacy DMA driver based access
  ARM: tegra: apbio: remove support of legacy DMA driver based access
  ARM: tegra: dma: remove legacy APB DMA driver
  ARM: tegra: config: enable dmaengine based APB DMA driver
  + sync to 3.6-rc6

8 files changed, 83 insertions, 36 deletions

diff --git a/drivers/i2c/algos/i2c-algo-pca.c b/drivers/i2c/algos/i2c-algo-pca.c
index 73133b1..6f5f98d 100644
--- a/drivers/i2c/algos/i2c-algo-pca.c
+++ b/drivers/i2c/algos/i2c-algo-pca.c
@@ -476,17 +476,17 @@ static int pca_init(struct i2c_adapter *adap)
 		/* To avoid integer overflow, use clock/100 for calculations */
 		clock = pca_clock(pca_data) / 100;
 
-		if (pca_data->i2c_clock > 10000) {
+		if (pca_data->i2c_clock > 1000000) {
 			mode = I2C_PCA_MODE_TURBO;
 			min_tlow = 14;
 			min_thi  = 5;
 			raise_fall_time = 22; /* Raise 11e-8s, Fall 11e-8s */
-		} else if (pca_data->i2c_clock > 4000) {
+		} else if (pca_data->i2c_clock > 400000) {
 			mode = I2C_PCA_MODE_FASTP;
 			min_tlow = 17;
 			min_thi  = 9;
 			raise_fall_time = 22; /* Raise 11e-8s, Fall 11e-8s */
-		} else if (pca_data->i2c_clock > 1000) {
+		} else if (pca_data->i2c_clock > 100000) {
 			mode = I2C_PCA_MODE_FAST;
 			min_tlow = 44;
 			min_thi  = 20;
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 2025adf..42d9fdd 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -104,6 +104,7 @@ config I2C_I801
 	    DH89xxCC (PCH)
 	    Panther Point (PCH)
 	    Lynx Point (PCH)
+	    Lynx Point-LP (PCH)
 
 	  This driver can also be built as a module.  If so, the module
 	  will be called i2c-i801.
@@ -354,9 +355,13 @@ config I2C_DAVINCI
 	  devices such as DaVinci NIC.
 	  For details please see http://www.ti.com/davinci
 
+config I2C_DESIGNWARE_CORE
+	tristate
+
 config I2C_DESIGNWARE_PLATFORM
 	tristate "Synopsys DesignWare Platform"
 	depends on HAVE_CLK
+	select I2C_DESIGNWARE_CORE
 	help
 	  If you say yes to this option, support will be included for the
 	  Synopsys DesignWare I2C adapter. Only master mode is supported.
@@ -367,6 +372,7 @@ config I2C_DESIGNWARE_PLATFORM
 config I2C_DESIGNWARE_PCI
 	tristate "Synopsys DesignWare PCI"
 	depends on PCI
+	select I2C_DESIGNWARE_CORE
 	help
 	  If you say yes to this option, support will be included for the
 	  Synopsys DesignWare I2C adapter. Only master mode is supported.
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index ce3c2be..37c4182 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,10 +33,11 @@ obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
 obj-$(CONFIG_I2C_CPM)		+= i2c-cpm.o
 obj-$(CONFIG_I2C_DAVINCI)	+= i2c-davinci.o
+obj-$(CONFIG_I2C_DESIGNWARE_CORE)	+= i2c-designware-core.o
 obj-$(CONFIG_I2C_DESIGNWARE_PLATFORM)	+= i2c-designware-platform.o
-i2c-designware-platform-objs := i2c-designware-platdrv.o i2c-designware-core.o
+i2c-designware-platform-objs := i2c-designware-platdrv.o
 obj-$(CONFIG_I2C_DESIGNWARE_PCI)	+= i2c-designware-pci.o
-i2c-designware-pci-objs := i2c-designware-pcidrv.o i2c-designware-core.o
+i2c-designware-pci-objs := i2c-designware-pcidrv.o
 obj-$(CONFIG_I2C_EG20T)		+= i2c-eg20t.o
 obj-$(CONFIG_I2C_GPIO)		+= i2c-gpio.o
 obj-$(CONFIG_I2C_HIGHLANDER)	+= i2c-highlander.o
diff --git a/drivers/i2c/busses/i2c-designware-core.c b/drivers/i2c/busses/i2c-designware-core.c
index 1e48bec..7b8ebbe 100644
--- a/drivers/i2c/busses/i2c-designware-core.c
+++ b/drivers/i2c/busses/i2c-designware-core.c
@@ -25,6 +25,7 @@
  * ----------------------------------------------------------------------------
  *
  */
+#include <linux/export.h>
 #include <linux/clk.h>
 #include <linux/errno.h>
 #include <linux/err.h>
@@ -316,6 +317,7 @@ int i2c_dw_init(struct dw_i2c_dev *dev)
 	dw_writel(dev, dev->master_cfg , DW_IC_CON);
 	return 0;
 }
+EXPORT_SYMBOL_GPL(i2c_dw_init);
 
 /*
  * Waiting for bus not busy
@@ -568,12 +570,14 @@ done:
 
 	return ret;
 }
+EXPORT_SYMBOL_GPL(i2c_dw_xfer);
 
 u32 i2c_dw_func(struct i2c_adapter *adap)
 {
 	struct dw_i2c_dev *dev = i2c_get_adapdata(adap);
 	return dev->functionality;
 }
+EXPORT_SYMBOL_GPL(i2c_dw_func);
 
 static u32 i2c_dw_read_clear_intrbits(struct dw_i2c_dev *dev)
 {
@@ -678,17 +682,20 @@ tx_aborted:
 
 	return IRQ_HANDLED;
 }
+EXPORT_SYMBOL_GPL(i2c_dw_isr);
 
 void i2c_dw_enable(struct dw_i2c_dev *dev)
 {
        /* Enable the adapter */
 	dw_writel(dev, 1, DW_IC_ENABLE);
 }
+EXPORT_SYMBOL_GPL(i2c_dw_enable);
 
 u32 i2c_dw_is_enabled(struct dw_i2c_dev *dev)
 {
 	return dw_readl(dev, DW_IC_ENABLE);
 }
+EXPORT_SYMBOL_GPL(i2c_dw_is_enabled);
 
 void i2c_dw_disable(struct dw_i2c_dev *dev)
 {
@@ -699,18 +706,22 @@ void i2c_dw_disable(struct dw_i2c_dev *dev)
 	dw_writel(dev, 0, DW_IC_INTR_MASK);
 	dw_readl(dev, DW_IC_CLR_INTR);
 }
+EXPORT_SYMBOL_GPL(i2c_dw_disable);
 
 void i2c_dw_clear_int(struct dw_i2c_dev *dev)
 {
 	dw_readl(dev, DW_IC_CLR_INTR);
 }
+EXPORT_SYMBOL_GPL(i2c_dw_clear_int);
 
 void i2c_dw_disable_int(struct dw_i2c_dev *dev)
 {
 	dw_writel(dev, 0, DW_IC_INTR_MASK);
 }
+EXPORT_SYMBOL_GPL(i2c_dw_disable_int);
 
 u32 i2c_dw_read_comp_param(struct dw_i2c_dev *dev)
 {
 	return dw_readl(dev, DW_IC_COMP_PARAM_1);
 }
+EXPORT_SYMBOL_GPL(i2c_dw_read_comp_param);
diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
index 898dcf9..33e9b0c 100644
--- a/drivers/i2c/busses/i2c-i801.c
+++ b/drivers/i2c/busses/i2c-i801.c
@@ -52,6 +52,7 @@
   DH89xxCC (PCH)        0x2330     32     hard     yes     yes     yes
   Panther Point (PCH)   0x1e22     32     hard     yes     yes     yes
   Lynx Point (PCH)      0x8c22     32     hard     yes     yes     yes
+  Lynx Point-LP (PCH)   0x9c22     32     hard     yes     yes     yes
 
   Features supported by this driver:
   Software PEC                     no
@@ -155,6 +156,7 @@
 #define PCI_DEVICE_ID_INTEL_DH89XXCC_SMBUS	0x2330
 #define PCI_DEVICE_ID_INTEL_5_3400_SERIES_SMBUS	0x3b30
 #define PCI_DEVICE_ID_INTEL_LYNXPOINT_SMBUS	0x8c22
+#define PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_SMBUS	0x9c22
 
 struct i801_priv {
 	struct i2c_adapter adapter;
@@ -771,6 +773,7 @@ static DEFINE_PCI_DEVICE_TABLE(i801_ids) = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_DH89XXCC_SMBUS) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PANTHERPOINT_SMBUS) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LYNXPOINT_SMBUS) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_SMBUS) },
 	{ 0, }
 };
 
diff --git a/drivers/i2c/busses/i2c-mxs.c b/drivers/i2c/busses/i2c-mxs.c
index 088c5c1..51f05b8 100644
--- a/drivers/i2c/busses/i2c-mxs.c
+++ b/drivers/i2c/busses/i2c-mxs.c
@@ -365,10 +365,6 @@ static int mxs_i2c_get_ofdata(struct mxs_i2c_dev *i2c)
 	struct device_node *node = dev->of_node;
 	int ret;
 
-	if (!node)
-		return -EINVAL;
-
-	i2c->speed = &mxs_i2c_95kHz_config;
 	ret = of_property_read_u32(node, "clock-frequency", &speed);
 	if (ret)
 		dev_warn(dev, "No I2C speed selected, using 100kHz\n");
@@ -419,10 +415,13 @@ static int __devinit mxs_i2c_probe(struct platform_device *pdev)
 		return err;
 
 	i2c->dev = dev;
+	i2c->speed = &mxs_i2c_95kHz_config;
 
-	err = mxs_i2c_get_ofdata(i2c);
-	if (err)
-		return err;
+	if (dev->of_node) {
+		err = mxs_i2c_get_ofdata(i2c);
+		if (err)
+			return err;
+	}
 
 	platform_set_drvdata(pdev, i2c);
 
diff --git a/drivers/i2c/busses/i2c-pnx.c b/drivers/i2c/busses/i2c-pnx.c
index 5d54416..8488bdd 100644
--- a/drivers/i2c/busses/i2c-pnx.c
+++ b/drivers/i2c/busses/i2c-pnx.c
@@ -48,8 +48,9 @@ enum {
 	mcntrl_afie = 0x00000002,
 	mcntrl_naie = 0x00000004,
 	mcntrl_drmie = 0x00000008,
-	mcntrl_daie = 0x00000020,
-	mcntrl_rffie = 0x00000040,
+	mcntrl_drsie = 0x00000010,
+	mcntrl_rffie = 0x00000020,
+	mcntrl_daie = 0x00000040,
 	mcntrl_tffie = 0x00000080,
 	mcntrl_reset = 0x00000100,
 	mcntrl_cdbmode = 0x00000400,
@@ -290,31 +291,37 @@ static int i2c_pnx_master_rcv(struct i2c_pnx_algo_data *alg_data)
 	 * or we didn't 'ask' for it yet.
 	 */
 	if (ioread32(I2C_REG_STS(alg_data)) & mstatus_rfe) {
-		dev_dbg(&alg_data->adapter.dev,
-			"%s(): Write dummy data to fill Rx-fifo...\n",
-			__func__);
+		/* 'Asking' is done asynchronously, e.g. dummy TX of several
+		 * bytes is done before the first actual RX arrives in FIFO.
+		 * Therefore, ordered bytes (via TX) are counted separately.
+		 */
+		if (alg_data->mif.order) {
+			dev_dbg(&alg_data->adapter.dev,
+				"%s(): Write dummy data to fill Rx-fifo...\n",
+				__func__);
 
-		if (alg_data->mif.len == 1) {
-			/* Last byte, do not acknowledge next rcv. */
-			val |= stop_bit;
+			if (alg_data->mif.order == 1) {
+				/* Last byte, do not acknowledge next rcv. */
+				val |= stop_bit;
+
+				/*
+				 * Enable interrupt RFDAIE (data in Rx fifo),
+				 * and disable DRMIE (need data for Tx)
+				 */
+				ctl = ioread32(I2C_REG_CTL(alg_data));
+				ctl |= mcntrl_rffie | mcntrl_daie;
+				ctl &= ~mcntrl_drmie;
+				iowrite32(ctl, I2C_REG_CTL(alg_data));
+			}
 
 			/*
-			 * Enable interrupt RFDAIE (data in Rx fifo),
-			 * and disable DRMIE (need data for Tx)
+			 * Now we'll 'ask' for data:
+			 * For each byte we want to receive, we must
+			 * write a (dummy) byte to the Tx-FIFO.
 			 */
-			ctl = ioread32(I2C_REG_CTL(alg_data));
-			ctl |= mcntrl_rffie | mcntrl_daie;
-			ctl &= ~mcntrl_drmie;
-			iowrite32(ctl, I2C_REG_CTL(alg_data));
+			iowrite32(val, I2C_REG_TX(alg_data));
+			alg_data->mif.order--;
 		}
-
-		/*
-		 * Now we'll 'ask' for data:
-		 * For each byte we want to receive, we must
-		 * write a (dummy) byte to the Tx-FIFO.
-		 */
-		iowrite32(val, I2C_REG_TX(alg_data));
-
 		return 0;
 	}
 
@@ -514,6 +521,7 @@ i2c_pnx_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
 
 		alg_data->mif.buf = pmsg->buf;
 		alg_data->mif.len = pmsg->len;
+		alg_data->mif.order = pmsg->len;
 		alg_data->mif.mode = (pmsg->flags & I2C_M_RD) ?
 			I2C_SMBUS_READ : I2C_SMBUS_WRITE;
 		alg_data->mif.ret = 0;
@@ -566,6 +574,7 @@ i2c_pnx_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
 	/* Cleanup to be sure... */
 	alg_data->mif.buf = NULL;
 	alg_data->mif.len = 0;
+	alg_data->mif.order = 0;
 
 	dev_dbg(&alg_data->adapter.dev, "%s(): exiting, stat = %x\n",
 		__func__, ioread32(I2C_REG_STS(alg_data)));
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 2efa56c..2091ae8f 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -637,6 +637,22 @@ static void i2c_adapter_dev_release(struct device *dev)
 }
 
 /*
+ * This function is only needed for mutex_lock_nested, so it is never
+ * called unless locking correctness checking is enabled. Thus we
+ * make it inline to avoid a compiler warning. That's what gcc ends up
+ * doing anyway.
+ */
+static inline unsigned int i2c_adapter_depth(struct i2c_adapter *adapter)
+{
+	unsigned int depth = 0;
+
+	while ((adapter = i2c_parent_is_i2c_adapter(adapter)))
+		depth++;
+
+	return depth;
+}
+
+/*
  * Let users instantiate I2C devices through sysfs. This can be used when
  * platform initialization code doesn't contain the proper data for
  * whatever reason. Also useful for drivers that do device detection and
@@ -726,7 +742,8 @@ i2c_sysfs_delete_device(struct device *dev, struct device_attribute *attr,
 
 	/* Make sure the device was added through sysfs */
 	res = -ENOENT;
-	mutex_lock(&adap->userspace_clients_lock);
+	mutex_lock_nested(&adap->userspace_clients_lock,
+			  i2c_adapter_depth(adap));
 	list_for_each_entry_safe(client, next, &adap->userspace_clients,
 				 detected) {
 		if (client->addr == addr) {
@@ -1073,7 +1090,8 @@ int i2c_del_adapter(struct i2c_adapter *adap)
 		return res;
 
 	/* Remove devices instantiated from sysfs */
-	mutex_lock(&adap->userspace_clients_lock);
+	mutex_lock_nested(&adap->userspace_clients_lock,
+			  i2c_adapter_depth(adap));
 	list_for_each_entry_safe(client, next, &adap->userspace_clients,
 				 detected) {
 		dev_dbg(&adap->dev, "Removing %s at 0x%x\n", client->name,