From b7af349b175af45f9d87b3bf3f0a221e1831ed39 Mon Sep 17 00:00:00 2001
From: Jarkko Nikula <jarkko.nikula@nokia.com>
Date: Fri, 21 Nov 2008 13:39:45 -0800
Subject: i2c-omap: Do not use interruptible wait call in omap_i2c_xfer_msg

If there is a signal pending and wait_for_completion_interruptible_timeout
terminates with -ERESTARTSYS, we return and disable the i2c clocks in
omap_i2c_xfer.

If we terminate before sending last i2c message with a stop condition, the
bus remains busy and we are not able to send new messages into bus with
successive omap_i2c_xfer calls. Therefore a pending signal is not caught
here and we return only because of timeout or i2c error.

Signed-off-by: Jarkko Nikula <jarkko.nikula@nokia.com>
Signed-off-by: Juha Yrjola <juha.yrjola@solidboot.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
 drivers/i2c/busses/i2c-omap.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

(limited to 'drivers')

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 608038d64f8..17476ecd978 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -328,8 +328,12 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
 		w |= OMAP_I2C_CON_STP;
 	omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w);
 
-	r = wait_for_completion_interruptible_timeout(&dev->cmd_complete,
-						      OMAP_I2C_TIMEOUT);
+	/*
+	 * REVISIT: We should abort the transfer on signals, but the bus goes
+	 * into arbitration and we're currently unable to recover from it.
+	 */
+	r = wait_for_completion_timeout(&dev->cmd_complete,
+					OMAP_I2C_TIMEOUT);
 	dev->buf_len = 0;
 	if (r < 0)
 		return r;
-- 
cgit v1.2.3-18-g5258


From 0cbbcffdf5f30ef60d918549014684eada4f5b3f Mon Sep 17 00:00:00 2001
From: Paul Walmsley <paul@pwsan.com>
Date: Fri, 21 Nov 2008 13:39:45 -0800
Subject: i2c-omap: Close suspected race between omap_i2c_idle() and
 omap_i2c_isr()

omap_i2c_idle() sets an internal flag, "dev->idle", instructing its
ISR to decline interrupts.  It sets this flag before it actually masks
the interrupts on the I2C controller.  This is problematic, since an
I2C interrupt could arrive after dev->idle is set, but before the
interrupt source is masked.  When this happens, Linux disables the I2C
controller's IRQ, causing all future transactions on the bus to fail.

Symptoms, happening on about 7% of boots:

   irq 56: nobody cared (try booting with the "irqpoll" option)
   <warning traceback here>
   Disabling IRQ #56
   i2c_omap i2c_omap.1: controller timed out

In omap_i2c_idle(), this patch sets dev->idle only after the interrupt
mask write to the I2C controller has left the ARM write buffer.
That's probably the major offender.  For additional prophylaxis, in
omap_i2c_unidle(), the patch clears the dev->idle flag before
interrupts are enabled, rather than afterwards.

The patch has survived twenty-two reboots on the 3430SDP here without
wedging I2C1.  Not absolutely dispositive, but promising!

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
 drivers/i2c/busses/i2c-omap.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

(limited to 'drivers')

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 17476ecd978..5ca0e0010a0 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -181,22 +181,26 @@ static void omap_i2c_unidle(struct omap_i2c_dev *dev)
 	if (dev->iclk != NULL)
 		clk_enable(dev->iclk);
 	clk_enable(dev->fclk);
+	dev->idle = 0;
 	if (dev->iestate)
 		omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, dev->iestate);
-	dev->idle = 0;
 }
 
 static void omap_i2c_idle(struct omap_i2c_dev *dev)
 {
 	u16 iv;
 
-	dev->idle = 1;
 	dev->iestate = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG);
 	omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, 0);
-	if (dev->rev1)
+	if (dev->rev1) {
 		iv = omap_i2c_read_reg(dev, OMAP_I2C_IV_REG);	/* Read clears */
-	else
+	} else {
 		omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, dev->iestate);
+
+		/* Flush posted write before the dev->idle store occurs */
+		omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG);
+	}
+	dev->idle = 1;
 	clk_disable(dev->fclk);
 	if (dev->iclk != NULL)
 		clk_disable(dev->iclk);
-- 
cgit v1.2.3-18-g5258


From 4574eb6892a13bc91aac8676457d46798935d653 Mon Sep 17 00:00:00 2001
From: Syed Mohammed Khasim <x0khasim@ti.com>
Date: Fri, 21 Nov 2008 13:39:45 -0800
Subject: i2c-omap: Add high-speed support to omap-i2c

Omap2430 has additional support for high-speed I2C.

This patch moves I2C speed parameter (from module) to platform data.
Also added basic High Speed support based on I2C bus speed.

This patch is tested for high speed I2C (with TWL4030 Keypad) and works as
expected.

Also change the 2430 i2chs_fck names to use the standard naming.

Cc: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Syed Mohammed Khasim  <x0khasim@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
 drivers/i2c/busses/i2c-omap.c | 82 +++++++++++++++++++++++++++++++------------
 1 file changed, 60 insertions(+), 22 deletions(-)

(limited to 'drivers')

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 5ca0e0010a0..b0aa0f8b564 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -83,6 +83,7 @@
 /* I2C Configuration Register (OMAP_I2C_CON): */
 #define OMAP_I2C_CON_EN		(1 << 15)	/* I2C module enable */
 #define OMAP_I2C_CON_BE		(1 << 14)	/* Big endian mode */
+#define OMAP_I2C_CON_OPMODE	(1 << 12)	/* High Speed support */
 #define OMAP_I2C_CON_STB	(1 << 11)	/* Start byte mode (master) */
 #define OMAP_I2C_CON_MST	(1 << 10)	/* Master/slave mode */
 #define OMAP_I2C_CON_TRX	(1 << 9)	/* TX/RX mode (master only) */
@@ -91,6 +92,10 @@
 #define OMAP_I2C_CON_STP	(1 << 1)	/* Stop cond (master only) */
 #define OMAP_I2C_CON_STT	(1 << 0)	/* Start condition (master) */
 
+/* I2C SCL time value when Master */
+#define OMAP_I2C_SCLL_HSSCLL	8
+#define OMAP_I2C_SCLH_HSSCLH	8
+
 /* I2C System Test Register (OMAP_I2C_SYSTEST): */
 #ifdef DEBUG
 #define OMAP_I2C_SYSTEST_ST_EN		(1 << 15)	/* System test enable */
@@ -109,12 +114,6 @@
 /* I2C System Configuration Register (OMAP_I2C_SYSC): */
 #define OMAP_I2C_SYSC_SRST		(1 << 1)	/* Soft Reset */
 
-/* REVISIT: Use platform_data instead of module parameters */
-/* Fast Mode = 400 kHz, Standard = 100 kHz */
-static int clock = 100; /* Default: 100 kHz */
-module_param(clock, int, 0);
-MODULE_PARM_DESC(clock, "Set I2C clock in kHz: 400=fast mode (default == 100)");
-
 struct omap_i2c_dev {
 	struct device		*dev;
 	void __iomem		*base;		/* virtual */
@@ -123,6 +122,7 @@ struct omap_i2c_dev {
 	struct clk		*fclk;		/* Functional clock */
 	struct completion	cmd_complete;
 	struct resource		*ioarea;
+	u32			speed;		/* Speed of bus in Khz */
 	u16			cmd_err;
 	u8			*buf;
 	size_t			buf_len;
@@ -208,9 +208,11 @@ static void omap_i2c_idle(struct omap_i2c_dev *dev)
 
 static int omap_i2c_init(struct omap_i2c_dev *dev)
 {
-	u16 psc = 0;
+	u16 psc = 0, scll = 0, sclh = 0;
+	u16 fsscll = 0, fssclh = 0, hsscll = 0, hssclh = 0;
 	unsigned long fclk_rate = 12000000;
 	unsigned long timeout;
+	unsigned long internal_clk = 0;
 
 	if (!dev->rev1) {
 		omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, OMAP_I2C_SYSC_SRST);
@@ -253,18 +255,47 @@ static int omap_i2c_init(struct omap_i2c_dev *dev)
 			psc = fclk_rate / 12000000;
 	}
 
+	if (cpu_is_omap2430()) {
+
+		/* HSI2C controller internal clk rate should be 19.2 Mhz */
+		internal_clk = 19200;
+		fclk_rate = clk_get_rate(dev->fclk) / 1000;
+
+		/* Compute prescaler divisor */
+		psc = fclk_rate / internal_clk;
+		psc = psc - 1;
+
+		/* If configured for High Speed */
+		if (dev->speed > 400) {
+			/* For first phase of HS mode */
+			fsscll = internal_clk / (400 * 2) - 6;
+			fssclh = internal_clk / (400 * 2) - 6;
+
+			/* For second phase of HS mode */
+			hsscll = fclk_rate / (dev->speed * 2) - 6;
+			hssclh = fclk_rate / (dev->speed * 2) - 6;
+		} else {
+			/* To handle F/S modes */
+			fsscll = internal_clk / (dev->speed * 2) - 6;
+			fssclh = internal_clk / (dev->speed * 2) - 6;
+		}
+		scll = (hsscll << OMAP_I2C_SCLL_HSSCLL) | fsscll;
+		sclh = (hssclh << OMAP_I2C_SCLH_HSSCLH) | fssclh;
+	} else {
+		/* Program desired operating rate */
+		fclk_rate /= (psc + 1) * 1000;
+		if (psc > 2)
+			psc = 2;
+		scll = fclk_rate / (dev->speed * 2) - 7 + psc;
+		sclh = fclk_rate / (dev->speed * 2) - 7 + psc;
+	}
+
 	/* Setup clock prescaler to obtain approx 12MHz I2C module clock: */
 	omap_i2c_write_reg(dev, OMAP_I2C_PSC_REG, psc);
 
-	/* Program desired operating rate */
-	fclk_rate /= (psc + 1) * 1000;
-	if (psc > 2)
-		psc = 2;
-
-	omap_i2c_write_reg(dev, OMAP_I2C_SCLL_REG,
-			   fclk_rate / (clock * 2) - 7 + psc);
-	omap_i2c_write_reg(dev, OMAP_I2C_SCLH_REG,
-			   fclk_rate / (clock * 2) - 7 + psc);
+	/* SCL low and high time values */
+	omap_i2c_write_reg(dev, OMAP_I2C_SCLL_REG, scll);
+	omap_i2c_write_reg(dev, OMAP_I2C_SCLH_REG, sclh);
 
 	/* Take the I2C module out of reset: */
 	omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
@@ -324,6 +355,11 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
 	dev->cmd_err = 0;
 
 	w = OMAP_I2C_CON_EN | OMAP_I2C_CON_MST | OMAP_I2C_CON_STT;
+
+	/* High speed configuration */
+	if (dev->speed > 400)
+		w |= OMAP_I2C_CON_OPMODE;
+
 	if (msg->flags & I2C_M_TEN)
 		w |= OMAP_I2C_CON_XA;
 	if (!(msg->flags & I2C_M_RD))
@@ -564,6 +600,7 @@ omap_i2c_probe(struct platform_device *pdev)
 	struct i2c_adapter	*adap;
 	struct resource		*mem, *irq, *ioarea;
 	int r;
+	u32 *speed = NULL;
 
 	/* NOTE: driver uses the static register mapping */
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -584,17 +621,18 @@ omap_i2c_probe(struct platform_device *pdev)
 		return -EBUSY;
 	}
 
-	if (clock > 200)
-		clock = 400;	/* Fast mode */
-	else
-		clock = 100;	/* Standard mode */
-
 	dev = kzalloc(sizeof(struct omap_i2c_dev), GFP_KERNEL);
 	if (!dev) {
 		r = -ENOMEM;
 		goto err_release_region;
 	}
 
+	if (pdev->dev.platform_data != NULL)
+		speed = (u32 *) pdev->dev.platform_data;
+	else
+		*speed = 100; /* Defualt speed */
+
+	dev->speed = *speed;
 	dev->dev = &pdev->dev;
 	dev->irq = irq->start;
 	dev->base = ioremap(mem->start, mem->end - mem->start + 1);
@@ -625,7 +663,7 @@ omap_i2c_probe(struct platform_device *pdev)
 	}
 	r = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) & 0xff;
 	dev_info(dev->dev, "bus %d rev%d.%d at %d kHz\n",
-		 pdev->id, r >> 4, r & 0xf, clock);
+		 pdev->id, r >> 4, r & 0xf, dev->speed);
 
 	adap = &dev->adapter;
 	i2c_set_adapdata(adap, dev);
-- 
cgit v1.2.3-18-g5258


From b6ee52c39999b2f3bcd9e26f0edf1f07599cf40e Mon Sep 17 00:00:00 2001
From: Nishanth Menon <nm@ti.com>
Date: Fri, 21 Nov 2008 13:39:46 -0800
Subject: i2c-omap: FIFO handling support and broken hw workaround for i2c-omap

Based on an earlier patch from Nishant Menon:

- Transfers can use FIFO on FIFO capable devices
- Prevents errors for HSI2C if FIFO is not used
- Implemented errenous handling of STT-STP handling on SDP2430

Also merged in is a fix from Jaron Marini to fix occasional i2c
hang if OMAP_I2C_CON_STT remains asserted.

Signed-off-by: Jason P Marini <jason.marini@gmail.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
 drivers/i2c/busses/i2c-omap.c | 190 +++++++++++++++++++++++++++++++++---------
 1 file changed, 150 insertions(+), 40 deletions(-)

(limited to 'drivers')

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index b0aa0f8b564..9ae4b74f3d1 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -55,8 +55,11 @@
 #define OMAP_I2C_SCLL_REG		0x34
 #define OMAP_I2C_SCLH_REG		0x38
 #define OMAP_I2C_SYSTEST_REG		0x3c
+#define OMAP_I2C_BUFSTAT_REG		0x40
 
 /* I2C Interrupt Enable Register (OMAP_I2C_IE): */
+#define OMAP_I2C_IE_XDR		(1 << 14)	/* TX Buffer drain int enable */
+#define OMAP_I2C_IE_RDR		(1 << 13)	/* RX Buffer drain int enable */
 #define OMAP_I2C_IE_XRDY	(1 << 4)	/* TX data ready int enable */
 #define OMAP_I2C_IE_RRDY	(1 << 3)	/* RX data ready int enable */
 #define OMAP_I2C_IE_ARDY	(1 << 2)	/* Access ready int enable */
@@ -64,7 +67,8 @@
 #define OMAP_I2C_IE_AL		(1 << 0)	/* Arbitration lost int ena */
 
 /* I2C Status Register (OMAP_I2C_STAT): */
-#define OMAP_I2C_STAT_SBD	(1 << 15)	/* Single byte data */
+#define OMAP_I2C_STAT_XDR	(1 << 14)	/* TX Buffer draining */
+#define OMAP_I2C_STAT_RDR	(1 << 13)	/* RX Buffer draining */
 #define OMAP_I2C_STAT_BB	(1 << 12)	/* Bus busy */
 #define OMAP_I2C_STAT_ROVR	(1 << 11)	/* Receive overrun */
 #define OMAP_I2C_STAT_XUDF	(1 << 10)	/* Transmit underflow */
@@ -78,12 +82,14 @@
 
 /* I2C Buffer Configuration Register (OMAP_I2C_BUF): */
 #define OMAP_I2C_BUF_RDMA_EN	(1 << 15)	/* RX DMA channel enable */
+#define OMAP_I2C_BUF_RXFIF_CLR	(1 << 14)	/* RX FIFO Clear */
 #define OMAP_I2C_BUF_XDMA_EN	(1 << 7)	/* TX DMA channel enable */
+#define OMAP_I2C_BUF_TXFIF_CLR	(1 << 6)	/* TX FIFO Clear */
 
 /* I2C Configuration Register (OMAP_I2C_CON): */
 #define OMAP_I2C_CON_EN		(1 << 15)	/* I2C module enable */
 #define OMAP_I2C_CON_BE		(1 << 14)	/* Big endian mode */
-#define OMAP_I2C_CON_OPMODE	(1 << 12)	/* High Speed support */
+#define OMAP_I2C_CON_OPMODE_HS	(1 << 12)	/* High Speed support */
 #define OMAP_I2C_CON_STB	(1 << 11)	/* Start byte mode (master) */
 #define OMAP_I2C_CON_MST	(1 << 10)	/* Master/slave mode */
 #define OMAP_I2C_CON_TRX	(1 << 9)	/* TX/RX mode (master only) */
@@ -127,7 +133,12 @@ struct omap_i2c_dev {
 	u8			*buf;
 	size_t			buf_len;
 	struct i2c_adapter	adapter;
+	u8			fifo_size;	/* use as flag and value
+						 * fifo_size==0 implies no fifo
+						 * if set, should be trsh+1
+						 */
 	unsigned		rev1:1;
+	unsigned		b_hw:1;		/* bad h/w fixes */
 	unsigned		idle:1;
 	u16			iestate;	/* Saved interrupt register */
 };
@@ -297,6 +308,14 @@ static int omap_i2c_init(struct omap_i2c_dev *dev)
 	omap_i2c_write_reg(dev, OMAP_I2C_SCLL_REG, scll);
 	omap_i2c_write_reg(dev, OMAP_I2C_SCLH_REG, sclh);
 
+	if (dev->fifo_size)
+		/* Note: setup required fifo size - 1 */
+		omap_i2c_write_reg(dev, OMAP_I2C_BUF_REG,
+					(dev->fifo_size - 1) << 8 | /* RTRSH */
+					OMAP_I2C_BUF_RXFIF_CLR |
+					(dev->fifo_size - 1) | /* XTRSH */
+					OMAP_I2C_BUF_TXFIF_CLR);
+
 	/* Take the I2C module out of reset: */
 	omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
 
@@ -304,7 +323,8 @@ static int omap_i2c_init(struct omap_i2c_dev *dev)
 	omap_i2c_write_reg(dev, OMAP_I2C_IE_REG,
 			   (OMAP_I2C_IE_XRDY | OMAP_I2C_IE_RRDY |
 			    OMAP_I2C_IE_ARDY | OMAP_I2C_IE_NACK |
-			    OMAP_I2C_IE_AL));
+			    OMAP_I2C_IE_AL)  | ((dev->fifo_size) ?
+				(OMAP_I2C_IE_RDR | OMAP_I2C_IE_XDR) : 0));
 	return 0;
 }
 
@@ -351,6 +371,11 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
 
 	omap_i2c_write_reg(dev, OMAP_I2C_CNT_REG, dev->buf_len);
 
+	/* Clear the FIFO Buffers */
+	w = omap_i2c_read_reg(dev, OMAP_I2C_BUF_REG);
+	w |= OMAP_I2C_BUF_RXFIF_CLR | OMAP_I2C_BUF_TXFIF_CLR;
+	omap_i2c_write_reg(dev, OMAP_I2C_BUF_REG, w);
+
 	init_completion(&dev->cmd_complete);
 	dev->cmd_err = 0;
 
@@ -358,16 +383,39 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
 
 	/* High speed configuration */
 	if (dev->speed > 400)
-		w |= OMAP_I2C_CON_OPMODE;
+		w |= OMAP_I2C_CON_OPMODE_HS;
 
 	if (msg->flags & I2C_M_TEN)
 		w |= OMAP_I2C_CON_XA;
 	if (!(msg->flags & I2C_M_RD))
 		w |= OMAP_I2C_CON_TRX;
-	if (stop)
+	if (!dev->b_hw && stop)
 		w |= OMAP_I2C_CON_STP;
 	omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w);
 
+	/*
+	 * Don't write stt and stp together on some hardware.
+	 */
+	if (dev->b_hw && stop) {
+		unsigned long delay = jiffies + OMAP_I2C_TIMEOUT;
+		u16 con = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG);
+		while (con & OMAP_I2C_CON_STT) {
+			con = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG);
+
+			/* Let the user know if i2c is in a bad state */
+			if (time_after(jiffies, delay)) {
+				dev_err(dev->dev, "controller timed out "
+				"waiting for start condition to finish\n");
+				return -ETIMEDOUT;
+			}
+			cpu_relax();
+		}
+
+		w |= OMAP_I2C_CON_STP;
+		w &= ~OMAP_I2C_CON_STT;
+		omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w);
+	}
+
 	/*
 	 * REVISIT: We should abort the transfer on signals, but the bus goes
 	 * into arbitration and we're currently unable to recover from it.
@@ -516,7 +564,7 @@ omap_i2c_isr(int this_irq, void *dev_id)
 	struct omap_i2c_dev *dev = dev_id;
 	u16 bits;
 	u16 stat, w;
-	int count = 0;
+	int err, count = 0;
 
 	if (dev->idle)
 		return IRQ_NONE;
@@ -531,39 +579,94 @@ omap_i2c_isr(int this_irq, void *dev_id)
 
 		omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, stat);
 
-		if (stat & OMAP_I2C_STAT_ARDY) {
-			omap_i2c_complete_cmd(dev, 0);
-			continue;
+		err = 0;
+		if (stat & OMAP_I2C_STAT_NACK) {
+			err |= OMAP_I2C_STAT_NACK;
+			omap_i2c_write_reg(dev, OMAP_I2C_CON_REG,
+					   OMAP_I2C_CON_STP);
 		}
-		if (stat & OMAP_I2C_STAT_RRDY) {
-			w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG);
-			if (dev->buf_len) {
-				*dev->buf++ = w;
-				dev->buf_len--;
+		if (stat & OMAP_I2C_STAT_AL) {
+			dev_err(dev->dev, "Arbitration lost\n");
+			err |= OMAP_I2C_STAT_AL;
+		}
+		if (stat & (OMAP_I2C_STAT_ARDY | OMAP_I2C_STAT_NACK |
+					OMAP_I2C_STAT_AL))
+			omap_i2c_complete_cmd(dev, err);
+		if (stat & (OMAP_I2C_STAT_RRDY | OMAP_I2C_STAT_RDR)) {
+			u8 num_bytes = 1;
+			if (dev->fifo_size) {
+				if (stat & OMAP_I2C_STAT_RRDY)
+					num_bytes = dev->fifo_size;
+				else
+					num_bytes = omap_i2c_read_reg(dev,
+							OMAP_I2C_BUFSTAT_REG);
+			}
+			while (num_bytes) {
+				num_bytes--;
+				w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG);
 				if (dev->buf_len) {
-					*dev->buf++ = w >> 8;
+					*dev->buf++ = w;
 					dev->buf_len--;
+					/* Data reg from 2430 is 8 bit wide */
+					if (!cpu_is_omap2430()) {
+						if (dev->buf_len) {
+							*dev->buf++ = w >> 8;
+							dev->buf_len--;
+						}
+					}
+				} else {
+					if (stat & OMAP_I2C_STAT_RRDY)
+						dev_err(dev->dev,
+							"RRDY IRQ while no data"
+								" requested\n");
+					if (stat & OMAP_I2C_STAT_RDR)
+						dev_err(dev->dev,
+							"RDR IRQ while no data"
+								" requested\n");
+					break;
 				}
-			} else
-				dev_err(dev->dev, "RRDY IRQ while no data "
-						"requested\n");
-			omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RRDY);
+			}
+			omap_i2c_ack_stat(dev,
+				stat & (OMAP_I2C_STAT_RRDY | OMAP_I2C_STAT_RDR));
 			continue;
 		}
-		if (stat & OMAP_I2C_STAT_XRDY) {
-			w = 0;
-			if (dev->buf_len) {
-				w = *dev->buf++;
-				dev->buf_len--;
+		if (stat & (OMAP_I2C_STAT_XRDY | OMAP_I2C_STAT_XDR)) {
+			u8 num_bytes = 1;
+			if (dev->fifo_size) {
+				if (stat & OMAP_I2C_STAT_XRDY)
+					num_bytes = dev->fifo_size;
+				else
+					num_bytes = omap_i2c_read_reg(dev,
+							OMAP_I2C_BUFSTAT_REG);
+			}
+			while (num_bytes) {
+				num_bytes--;
+				w = 0;
 				if (dev->buf_len) {
-					w |= *dev->buf++ << 8;
+					w = *dev->buf++;
 					dev->buf_len--;
+					/* Data reg from  2430 is 8 bit wide */
+					if (!cpu_is_omap2430()) {
+						if (dev->buf_len) {
+							w |= *dev->buf++ << 8;
+							dev->buf_len--;
+						}
+					}
+				} else {
+					if (stat & OMAP_I2C_STAT_XRDY)
+						dev_err(dev->dev,
+							"XRDY IRQ while no "
+							"data to send\n");
+					if (stat & OMAP_I2C_STAT_XDR)
+						dev_err(dev->dev,
+							"XDR IRQ while no "
+							"data to send\n");
+					break;
 				}
-			} else
-				dev_err(dev->dev, "XRDY IRQ while no "
-					"data to send\n");
-			omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w);
-			omap_i2c_ack_stat(dev, OMAP_I2C_STAT_XRDY);
+				omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w);
+			}
+			omap_i2c_ack_stat(dev,
+				stat & (OMAP_I2C_STAT_XRDY | OMAP_I2C_STAT_XDR));
 			continue;
 		}
 		if (stat & OMAP_I2C_STAT_ROVR) {
@@ -571,18 +674,9 @@ omap_i2c_isr(int this_irq, void *dev_id)
 			dev->cmd_err |= OMAP_I2C_STAT_ROVR;
 		}
 		if (stat & OMAP_I2C_STAT_XUDF) {
-			dev_err(dev->dev, "Transmit overflow\n");
+			dev_err(dev->dev, "Transmit underflow\n");
 			dev->cmd_err |= OMAP_I2C_STAT_XUDF;
 		}
-		if (stat & OMAP_I2C_STAT_NACK) {
-			omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_NACK);
-			omap_i2c_write_reg(dev, OMAP_I2C_CON_REG,
-					   OMAP_I2C_CON_STP);
-		}
-		if (stat & OMAP_I2C_STAT_AL) {
-			dev_err(dev->dev, "Arbitration lost\n");
-			omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_AL);
-		}
 	}
 
 	return count ? IRQ_HANDLED : IRQ_NONE;
@@ -651,6 +745,22 @@ omap_i2c_probe(struct platform_device *pdev)
 	if (cpu_is_omap15xx())
 		dev->rev1 = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) < 0x20;
 
+	if (cpu_is_omap2430()) {
+		u16 s;
+
+		/* Set up the fifo size - Get total size */
+		s = (omap_i2c_read_reg(dev, OMAP_I2C_BUFSTAT_REG) >> 14) & 0x3;
+		dev->fifo_size = 0x8 << s;
+
+		/*
+		 * Set up notification threshold as half the total available
+		 * size. This is to ensure that we can handle the status on int
+		 * call back latencies.
+		 */
+		dev->fifo_size = (dev->fifo_size / 2);
+		dev->b_hw = 1; /* Enable hardware fixes */
+	}
+
 	/* reset ASAP, clearing any IRQs */
 	omap_i2c_init(dev);
 
-- 
cgit v1.2.3-18-g5258


From 3d522fb41ead214d9d9236ec184271633e1cfc2f Mon Sep 17 00:00:00 2001
From: Chandra shekhar <x0044955@ti.com>
Date: Fri, 21 Nov 2008 13:39:46 -0800
Subject: i2c-omap: Add support for omap34xx

Add support for omap34xx

Signed-off-by: chandra shekhar <x0044955@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
 drivers/i2c/busses/i2c-omap.c | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

(limited to 'drivers')

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 9ae4b74f3d1..3f7726a4312 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -156,7 +156,7 @@ static inline u16 omap_i2c_read_reg(struct omap_i2c_dev *i2c_dev, int reg)
 
 static int omap_i2c_get_clocks(struct omap_i2c_dev *dev)
 {
-	if (cpu_is_omap16xx() || cpu_is_omap24xx()) {
+	if (cpu_is_omap16xx() || cpu_class_is_omap2()) {
 		dev->iclk = clk_get(dev->dev, "i2c_ick");
 		if (IS_ERR(dev->iclk)) {
 			dev->iclk = NULL;
@@ -266,7 +266,7 @@ static int omap_i2c_init(struct omap_i2c_dev *dev)
 			psc = fclk_rate / 12000000;
 	}
 
-	if (cpu_is_omap2430()) {
+	if (cpu_is_omap2430() || cpu_is_omap34xx()) {
 
 		/* HSI2C controller internal clk rate should be 19.2 Mhz */
 		internal_clk = 19200;
@@ -608,7 +608,8 @@ omap_i2c_isr(int this_irq, void *dev_id)
 					*dev->buf++ = w;
 					dev->buf_len--;
 					/* Data reg from 2430 is 8 bit wide */
-					if (!cpu_is_omap2430()) {
+					if (!cpu_is_omap2430() &&
+							!cpu_is_omap34xx()) {
 						if (dev->buf_len) {
 							*dev->buf++ = w >> 8;
 							dev->buf_len--;
@@ -646,7 +647,8 @@ omap_i2c_isr(int this_irq, void *dev_id)
 					w = *dev->buf++;
 					dev->buf_len--;
 					/* Data reg from  2430 is 8 bit wide */
-					if (!cpu_is_omap2430()) {
+					if (!cpu_is_omap2430() &&
+							!cpu_is_omap34xx()) {
 						if (dev->buf_len) {
 							w |= *dev->buf++ << 8;
 							dev->buf_len--;
@@ -694,7 +696,7 @@ omap_i2c_probe(struct platform_device *pdev)
 	struct i2c_adapter	*adap;
 	struct resource		*mem, *irq, *ioarea;
 	int r;
-	u32 *speed = NULL;
+	u32 speed = 0;
 
 	/* NOTE: driver uses the static register mapping */
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -722,11 +724,11 @@ omap_i2c_probe(struct platform_device *pdev)
 	}
 
 	if (pdev->dev.platform_data != NULL)
-		speed = (u32 *) pdev->dev.platform_data;
+		speed = *(u32 *)pdev->dev.platform_data;
 	else
-		*speed = 100; /* Defualt speed */
+		speed = 100;	/* Defualt speed */
 
-	dev->speed = *speed;
+	dev->speed = speed;
 	dev->dev = &pdev->dev;
 	dev->irq = irq->start;
 	dev->base = ioremap(mem->start, mem->end - mem->start + 1);
@@ -745,7 +747,7 @@ omap_i2c_probe(struct platform_device *pdev)
 	if (cpu_is_omap15xx())
 		dev->rev1 = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) < 0x20;
 
-	if (cpu_is_omap2430()) {
+	if (cpu_is_omap2430() || cpu_is_omap34xx()) {
 		u16 s;
 
 		/* Set up the fifo size - Get total size */
-- 
cgit v1.2.3-18-g5258


From 510be9c9ad852dc902fd926ec8e03b67e62d8915 Mon Sep 17 00:00:00 2001
From: Paul Walmsley <paul@pwsan.com>
Date: Fri, 21 Nov 2008 13:39:46 -0800
Subject: i2c-omap: Mark init-only functions as __init

Mark functions called only at init time as __init.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
 drivers/i2c/busses/i2c-omap.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'drivers')

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 3f7726a4312..61d2e5ad6d6 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -154,7 +154,7 @@ static inline u16 omap_i2c_read_reg(struct omap_i2c_dev *i2c_dev, int reg)
 	return __raw_readw(i2c_dev->base + reg);
 }
 
-static int omap_i2c_get_clocks(struct omap_i2c_dev *dev)
+static int __init omap_i2c_get_clocks(struct omap_i2c_dev *dev)
 {
 	if (cpu_is_omap16xx() || cpu_class_is_omap2()) {
 		dev->iclk = clk_get(dev->dev, "i2c_ick");
@@ -689,7 +689,7 @@ static const struct i2c_algorithm omap_i2c_algo = {
 	.functionality	= omap_i2c_func,
 };
 
-static int
+static int __init
 omap_i2c_probe(struct platform_device *pdev)
 {
 	struct omap_i2c_dev	*dev;
-- 
cgit v1.2.3-18-g5258


From 43469d8e2aaecc61403d1527dda7441fba8c0e50 Mon Sep 17 00:00:00 2001
From: Paul Walmsley <paul@pwsan.com>
Date: Fri, 21 Nov 2008 13:39:47 -0800
Subject: i2c-omap: Don't compile in OMAP15xx I2C ISR for non-OMAP15xx builds

Skip compiling OMAP15xx I2C ISR for non-OMAP15xx builds.  Saves 400 bytes
of text for most OMAP builds.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
 drivers/i2c/busses/i2c-omap.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'drivers')

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 61d2e5ad6d6..195c3d1a725 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -503,6 +503,9 @@ omap_i2c_ack_stat(struct omap_i2c_dev *dev, u16 stat)
 	omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, stat);
 }
 
+/* rev1 devices are apparently only on some 15xx */
+#ifdef CONFIG_ARCH_OMAP15XX
+
 static irqreturn_t
 omap_i2c_rev1_isr(int this_irq, void *dev_id)
 {
@@ -557,6 +560,9 @@ omap_i2c_rev1_isr(int this_irq, void *dev_id)
 
 	return IRQ_HANDLED;
 }
+#else
+#define omap_i2c_rev1_isr		0
+#endif
 
 static irqreturn_t
 omap_i2c_isr(int this_irq, void *dev_id)
-- 
cgit v1.2.3-18-g5258


From c1a473bde4c06e8e6996ce3a33121b7a9a86b4b9 Mon Sep 17 00:00:00 2001
From: Tony Lindgren <tony@atomide.com>
Date: Fri, 21 Nov 2008 13:39:47 -0800
Subject: i2c-omap: Clean-up i2c-omap

Minor sparse, checkpatch and formatting clean-up. Also update copyrights.

Signed-off-by: Tony Lindgren <tony@atomide.com>
---
 drivers/i2c/busses/i2c-omap.c | 31 ++++++++++++++++++-------------
 1 file changed, 18 insertions(+), 13 deletions(-)

(limited to 'drivers')

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 195c3d1a725..4aeebad8ec9 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -2,13 +2,16 @@
  * TI OMAP I2C master mode driver
  *
  * Copyright (C) 2003 MontaVista Software, Inc.
- * Copyright (C) 2004 Texas Instruments.
- *
- * Updated to work with multiple I2C interfaces on 24xx by
- * Tony Lindgren <tony@atomide.com> and Imre Deak <imre.deak@nokia.com>
  * Copyright (C) 2005 Nokia Corporation
+ * Copyright (C) 2004 - 2007 Texas Instruments.
  *
- * Cleaned up by Juha Yrjölä <juha.yrjola@nokia.com>
+ * Originally written by MontaVista Software, Inc.
+ * Additional contributions by:
+ *	Tony Lindgren <tony@atomide.com>
+ *	Imre Deak <imre.deak@nokia.com>
+ *	Juha Yrjölä <juha.yrjola@solidboot.com>
+ *	Syed Khasim <x0khasim@ti.com>
+ *	Nishant Menon <nm@ti.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -33,8 +36,7 @@
 #include <linux/completion.h>
 #include <linux/platform_device.h>
 #include <linux/clk.h>
-
-#include <asm/io.h>
+#include <linux/io.h>
 
 /* timeout waiting for the controller to respond */
 #define OMAP_I2C_TIMEOUT (msecs_to_jiffies(1000))
@@ -204,7 +206,7 @@ static void omap_i2c_idle(struct omap_i2c_dev *dev)
 	dev->iestate = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG);
 	omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, 0);
 	if (dev->rev1) {
-		iv = omap_i2c_read_reg(dev, OMAP_I2C_IV_REG);	/* Read clears */
+		iv = omap_i2c_read_reg(dev, OMAP_I2C_IV_REG); /* Read clears */
 	} else {
 		omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, dev->iestate);
 
@@ -321,9 +323,9 @@ static int omap_i2c_init(struct omap_i2c_dev *dev)
 
 	/* Enable interrupts */
 	omap_i2c_write_reg(dev, OMAP_I2C_IE_REG,
-			   (OMAP_I2C_IE_XRDY | OMAP_I2C_IE_RRDY |
-			    OMAP_I2C_IE_ARDY | OMAP_I2C_IE_NACK |
-			    OMAP_I2C_IE_AL)  | ((dev->fifo_size) ?
+			(OMAP_I2C_IE_XRDY | OMAP_I2C_IE_RRDY |
+			OMAP_I2C_IE_ARDY | OMAP_I2C_IE_NACK |
+			OMAP_I2C_IE_AL)  | ((dev->fifo_size) ?
 				(OMAP_I2C_IE_RDR | OMAP_I2C_IE_XDR) : 0));
 	return 0;
 }
@@ -389,8 +391,10 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
 		w |= OMAP_I2C_CON_XA;
 	if (!(msg->flags & I2C_M_RD))
 		w |= OMAP_I2C_CON_TRX;
+
 	if (!dev->b_hw && stop)
 		w |= OMAP_I2C_CON_STP;
+
 	omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w);
 
 	/*
@@ -468,7 +472,8 @@ omap_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
 
 	omap_i2c_unidle(dev);
 
-	if ((r = omap_i2c_wait_for_bb(dev)) < 0)
+	r = omap_i2c_wait_for_bb(dev);
+	if (r < 0)
 		goto out;
 
 	for (i = 0; i < num; i++) {
@@ -561,7 +566,7 @@ omap_i2c_rev1_isr(int this_irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 #else
-#define omap_i2c_rev1_isr		0
+#define omap_i2c_rev1_isr		NULL
 #endif
 
 static irqreturn_t
-- 
cgit v1.2.3-18-g5258


From 3831f154418e058616129942e8175dc4c7e4a1d8 Mon Sep 17 00:00:00 2001
From: Paul Walmsley <paul@pwsan.com>
Date: Fri, 21 Nov 2008 13:39:47 -0800
Subject: i2c-omap: fix I2C timeouts due to recursive omap_i2c_{un,}idle()

omap_i2c_unidle() and omap_i2c_idle() are called recursively during
omap_i2c_probe().  This is evidently unexpected and will wipe
out the I2C interrupt enable register the second time that
omap_i2c_idle() is called consecutively.  Any I2C transactions
following a probe of a bus with at least one device on it will then
time out.

Fix by moving omap_i2c_idle() further up in omap_i2c_probe().  Ensure
the I2C controller is marked as idle before the probe starts.  Also
attempt to catch future reappearances of this bug early in development
by warning in omap_i2c_{un,}idle() when they are called recursively.

Problem reported by David Brownell <david-b@pacbell.net>.

Tested on 3430SDP and 2430SDP.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: David Brownell <david-b@pacbell.net>
Cc: Richard Woodruff <r-woodruff2@ti.com>
Acked-by; Steve Sakoman <steve@sakoman.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
 drivers/i2c/busses/i2c-omap.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

(limited to 'drivers')

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 4aeebad8ec9..40a1e4bc92f 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -191,6 +191,8 @@ static void omap_i2c_put_clocks(struct omap_i2c_dev *dev)
 
 static void omap_i2c_unidle(struct omap_i2c_dev *dev)
 {
+	WARN_ON(!dev->idle);
+
 	if (dev->iclk != NULL)
 		clk_enable(dev->iclk);
 	clk_enable(dev->fclk);
@@ -203,6 +205,8 @@ static void omap_i2c_idle(struct omap_i2c_dev *dev)
 {
 	u16 iv;
 
+	WARN_ON(dev->idle);
+
 	dev->iestate = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG);
 	omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, 0);
 	if (dev->rev1) {
@@ -740,6 +744,7 @@ omap_i2c_probe(struct platform_device *pdev)
 		speed = 100;	/* Defualt speed */
 
 	dev->speed = speed;
+	dev->idle = 1;
 	dev->dev = &pdev->dev;
 	dev->irq = irq->start;
 	dev->base = ioremap(mem->start, mem->end - mem->start + 1);
@@ -788,6 +793,8 @@ omap_i2c_probe(struct platform_device *pdev)
 	dev_info(dev->dev, "bus %d rev%d.%d at %d kHz\n",
 		 pdev->id, r >> 4, r & 0xf, dev->speed);
 
+	omap_i2c_idle(dev);
+
 	adap = &dev->adapter;
 	i2c_set_adapdata(adap, dev);
 	adap->owner = THIS_MODULE;
@@ -804,8 +811,6 @@ omap_i2c_probe(struct platform_device *pdev)
 		goto err_free_irq;
 	}
 
-	omap_i2c_idle(dev);
-
 	return 0;
 
 err_free_irq:
-- 
cgit v1.2.3-18-g5258


From 9c76b878eb3f837ff98b37aa254e6cc7942e946b Mon Sep 17 00:00:00 2001
From: Paul Walmsley <paul@pwsan.com>
Date: Fri, 21 Nov 2008 13:39:55 -0800
Subject: i2c-omap: convert 'rev1' flag to generic 'rev' u8

i2c-omap discriminates only between "revision 1" or "greater than
revision 1."  A following patch introduces code that must also
discriminate between rev2.x, rev3.6, and rev3.12 controllers.  Support
this by storing the full revision data from the I2C_REV register, rather
than just a single bit.

The revision definitions may need to be extended for other ES levels
that aren't currently available here.  rev3.6 is what's present on the
2430SDP here (unknown ES revision); rev3.12 is used on the 3430ES2
here.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
 drivers/i2c/busses/i2c-omap.c | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

(limited to 'drivers')

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 40a1e4bc92f..3ac510d9c9b 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -38,6 +38,13 @@
 #include <linux/clk.h>
 #include <linux/io.h>
 
+/* I2C controller revisions */
+#define OMAP_I2C_REV_2			0x20
+
+/* I2C controller revisions present on specific hardware */
+#define OMAP_I2C_REV_ON_2430		0x36
+#define OMAP_I2C_REV_ON_3430		0x3C
+
 /* timeout waiting for the controller to respond */
 #define OMAP_I2C_TIMEOUT (msecs_to_jiffies(1000))
 
@@ -139,7 +146,7 @@ struct omap_i2c_dev {
 						 * fifo_size==0 implies no fifo
 						 * if set, should be trsh+1
 						 */
-	unsigned		rev1:1;
+	u8			rev;
 	unsigned		b_hw:1;		/* bad h/w fixes */
 	unsigned		idle:1;
 	u16			iestate;	/* Saved interrupt register */
@@ -209,7 +216,7 @@ static void omap_i2c_idle(struct omap_i2c_dev *dev)
 
 	dev->iestate = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG);
 	omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, 0);
-	if (dev->rev1) {
+	if (dev->rev < OMAP_I2C_REV_2) {
 		iv = omap_i2c_read_reg(dev, OMAP_I2C_IV_REG); /* Read clears */
 	} else {
 		omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, dev->iestate);
@@ -231,7 +238,7 @@ static int omap_i2c_init(struct omap_i2c_dev *dev)
 	unsigned long timeout;
 	unsigned long internal_clk = 0;
 
-	if (!dev->rev1) {
+	if (dev->rev >= OMAP_I2C_REV_2) {
 		omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, OMAP_I2C_SYSC_SRST);
 		/* For some reason we need to set the EN bit before the
 		 * reset done bit gets set. */
@@ -710,6 +717,7 @@ omap_i2c_probe(struct platform_device *pdev)
 	struct omap_i2c_dev	*dev;
 	struct i2c_adapter	*adap;
 	struct resource		*mem, *irq, *ioarea;
+	void *isr;
 	int r;
 	u32 speed = 0;
 
@@ -760,8 +768,7 @@ omap_i2c_probe(struct platform_device *pdev)
 
 	omap_i2c_unidle(dev);
 
-	if (cpu_is_omap15xx())
-		dev->rev1 = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) < 0x20;
+	dev->rev = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) & 0xff;
 
 	if (cpu_is_omap2430() || cpu_is_omap34xx()) {
 		u16 s;
@@ -782,16 +789,16 @@ omap_i2c_probe(struct platform_device *pdev)
 	/* reset ASAP, clearing any IRQs */
 	omap_i2c_init(dev);
 
-	r = request_irq(dev->irq, dev->rev1 ? omap_i2c_rev1_isr : omap_i2c_isr,
-			0, pdev->name, dev);
+	isr = (dev->rev < OMAP_I2C_REV_2) ? omap_i2c_rev1_isr : omap_i2c_isr;
+	r = request_irq(dev->irq, isr, 0, pdev->name, dev);
 
 	if (r) {
 		dev_err(dev->dev, "failure requesting irq %i\n", dev->irq);
 		goto err_unuse_clocks;
 	}
-	r = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) & 0xff;
+
 	dev_info(dev->dev, "bus %d rev%d.%d at %d kHz\n",
-		 pdev->id, r >> 4, r & 0xf, dev->speed);
+		 pdev->id, dev->rev >> 4, dev->rev & 0xf, dev->speed);
 
 	omap_i2c_idle(dev);
 
-- 
cgit v1.2.3-18-g5258


From fdd07fe6f6fe54250d8b1126b42ebdc72d938f05 Mon Sep 17 00:00:00 2001
From: Paul Walmsley <paul@pwsan.com>
Date: Fri, 21 Nov 2008 13:39:55 -0800
Subject: i2c-omap: reprogram OCP_SYSCONFIG register after reset

The I2C controller clears its OCP_SYSCONFIG register after an OCP soft reset.
Reprogram OCP_SYSCONFIG for maximum power savings on rev3.6 controllers
and beyond.  On 2430, this involves setting the module AUTOIDLE bit.
On 3430, this includes module AUTOIDLE, wakeup enable, slave smart-idle,
and considers only the module functional clock state for idle-ack.

Boot-tested on 2430SDP and 3430SDP.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Richard Woodruff <r-woodruff2@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
 drivers/i2c/busses/i2c-omap.c | 40 ++++++++++++++++++++++++++++++++++------
 1 file changed, 34 insertions(+), 6 deletions(-)

(limited to 'drivers')

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 3ac510d9c9b..b2023541587 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -123,11 +123,19 @@
 #define OMAP_I2C_SYSTEST_SDA_O		(1 << 0)	/* SDA line drive out */
 #endif
 
-/* I2C System Status register (OMAP_I2C_SYSS): */
-#define OMAP_I2C_SYSS_RDONE		(1 << 0)	/* Reset Done */
+/* OCP_SYSSTATUS bit definitions */
+#define SYSS_RESETDONE_MASK		(1 << 0)
+
+/* OCP_SYSCONFIG bit definitions */
+#define SYSC_CLOCKACTIVITY_MASK		(0x3 << 8)
+#define SYSC_SIDLEMODE_MASK		(0x3 << 3)
+#define SYSC_ENAWAKEUP_MASK		(1 << 2)
+#define SYSC_SOFTRESET_MASK		(1 << 1)
+#define SYSC_AUTOIDLE_MASK		(1 << 0)
+
+#define SYSC_IDLEMODE_SMART		0x2
+#define SYSC_CLOCKACTIVITY_FCLK		0x2
 
-/* I2C System Configuration Register (OMAP_I2C_SYSC): */
-#define OMAP_I2C_SYSC_SRST		(1 << 1)	/* Soft Reset */
 
 struct omap_i2c_dev {
 	struct device		*dev;
@@ -239,13 +247,13 @@ static int omap_i2c_init(struct omap_i2c_dev *dev)
 	unsigned long internal_clk = 0;
 
 	if (dev->rev >= OMAP_I2C_REV_2) {
-		omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, OMAP_I2C_SYSC_SRST);
+		omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, SYSC_SOFTRESET_MASK);
 		/* For some reason we need to set the EN bit before the
 		 * reset done bit gets set. */
 		timeout = jiffies + OMAP_I2C_TIMEOUT;
 		omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
 		while (!(omap_i2c_read_reg(dev, OMAP_I2C_SYSS_REG) &
-			 OMAP_I2C_SYSS_RDONE)) {
+			 SYSS_RESETDONE_MASK)) {
 			if (time_after(jiffies, timeout)) {
 				dev_warn(dev->dev, "timeout waiting "
 						"for controller reset\n");
@@ -253,6 +261,26 @@ static int omap_i2c_init(struct omap_i2c_dev *dev)
 			}
 			msleep(1);
 		}
+
+		/* SYSC register is cleared by the reset; rewrite it */
+		if (dev->rev == OMAP_I2C_REV_ON_2430) {
+
+			omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG,
+					   SYSC_AUTOIDLE_MASK);
+
+		} else if (dev->rev >= OMAP_I2C_REV_ON_3430) {
+			u32 v;
+
+			v = SYSC_AUTOIDLE_MASK;
+			v |= SYSC_ENAWAKEUP_MASK;
+			v |= (SYSC_IDLEMODE_SMART <<
+			      __ffs(SYSC_SIDLEMODE_MASK));
+			v |= (SYSC_CLOCKACTIVITY_FCLK <<
+			      __ffs(SYSC_CLOCKACTIVITY_MASK));
+
+			omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, v);
+
+		}
 	}
 	omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
 
-- 
cgit v1.2.3-18-g5258


From 5043e9e737c4909e7f187d479227df46f5a2dd53 Mon Sep 17 00:00:00 2001
From: Kalle Jokiniemi <ext-kalle.jokiniemi@nokia.com>
Date: Fri, 21 Nov 2008 13:39:55 -0800
Subject: i2c-omap: Enable I2C wakeups for 34xx

I2C_WE registers were not configured, which caused huge delays in
I2C operations while cpu idle was enabled and omap entered WFI.

This patch enables all I2C wakeup sources.

Signed-off-by: Kalle Jokiniemi <ext-kalle.jokiniemi@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
 drivers/i2c/busses/i2c-omap.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

(limited to 'drivers')

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index b2023541587..96f3bedb279 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -52,6 +52,8 @@
 #define OMAP_I2C_IE_REG			0x04
 #define OMAP_I2C_STAT_REG		0x08
 #define OMAP_I2C_IV_REG			0x0c
+/* For OMAP3 I2C_IV has changed to I2C_WE (wakeup enable) */
+#define OMAP_I2C_WE_REG			0x0c
 #define OMAP_I2C_SYSS_REG		0x10
 #define OMAP_I2C_BUF_REG		0x14
 #define OMAP_I2C_CNT_REG		0x18
@@ -89,6 +91,24 @@
 #define OMAP_I2C_STAT_NACK	(1 << 1)	/* No ack interrupt enable */
 #define OMAP_I2C_STAT_AL	(1 << 0)	/* Arbitration lost int ena */
 
+/* I2C WE wakeup enable register */
+#define OMAP_I2C_WE_XDR_WE	(1 << 14)	/* TX drain wakup */
+#define OMAP_I2C_WE_RDR_WE	(1 << 13)	/* RX drain wakeup */
+#define OMAP_I2C_WE_AAS_WE	(1 << 9)	/* Address as slave wakeup*/
+#define OMAP_I2C_WE_BF_WE	(1 << 8)	/* Bus free wakeup */
+#define OMAP_I2C_WE_STC_WE	(1 << 6)	/* Start condition wakeup */
+#define OMAP_I2C_WE_GC_WE	(1 << 5)	/* General call wakeup */
+#define OMAP_I2C_WE_DRDY_WE	(1 << 3)	/* TX/RX data ready wakeup */
+#define OMAP_I2C_WE_ARDY_WE	(1 << 2)	/* Reg access ready wakeup */
+#define OMAP_I2C_WE_NACK_WE	(1 << 1)	/* No acknowledgment wakeup */
+#define OMAP_I2C_WE_AL_WE	(1 << 0)	/* Arbitration lost wakeup */
+
+#define OMAP_I2C_WE_ALL		(OMAP_I2C_WE_XDR_WE | OMAP_I2C_WE_RDR_WE | \
+				OMAP_I2C_WE_AAS_WE | OMAP_I2C_WE_BF_WE | \
+				OMAP_I2C_WE_STC_WE | OMAP_I2C_WE_GC_WE | \
+				OMAP_I2C_WE_DRDY_WE | OMAP_I2C_WE_ARDY_WE | \
+				OMAP_I2C_WE_NACK_WE | OMAP_I2C_WE_AL_WE)
+
 /* I2C Buffer Configuration Register (OMAP_I2C_BUF): */
 #define OMAP_I2C_BUF_RDMA_EN	(1 << 15)	/* RX DMA channel enable */
 #define OMAP_I2C_BUF_RXFIF_CLR	(1 << 14)	/* RX FIFO Clear */
@@ -279,6 +299,13 @@ static int omap_i2c_init(struct omap_i2c_dev *dev)
 			      __ffs(SYSC_CLOCKACTIVITY_MASK));
 
 			omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, v);
+			/*
+			 * Enabling all wakup sources to stop I2C freezing on
+			 * WFI instruction.
+			 * REVISIT: Some wkup sources might not be needed.
+			 */
+			omap_i2c_write_reg(dev, OMAP_I2C_WE_REG,
+							OMAP_I2C_WE_ALL);
 
 		}
 	}
-- 
cgit v1.2.3-18-g5258


From 3d0911bfe03b5f077cef32ca644b5756d48affc3 Mon Sep 17 00:00:00 2001
From: Ben Dooks <ben-linux@fluff.org>
Date: Fri, 31 Oct 2008 16:10:24 +0000
Subject: i2c-s3c2410: Fixup style problems from checkpatch.pl

Fixup the 36 warnings and errors generated from running
checkpatch.pl on the driver. The warnings are too numerous
to be listed here.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
---
 drivers/i2c/busses/i2c-s3c2410.c | 88 ++++++++++++++++++++--------------------
 1 file changed, 44 insertions(+), 44 deletions(-)

(limited to 'drivers')

diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index 1fac4e23313..f5efece9b16 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -109,7 +109,8 @@ static inline int s3c24xx_i2c_is2440(struct s3c24xx_i2c *i2c)
  * the default if there is none
 */
 
-static inline struct s3c2410_platform_i2c *s3c24xx_i2c_get_platformdata(struct device *dev)
+static inline struct s3c2410_platform_i2c *
+s3c24xx_i2c_get_platformdata(struct device *dev)
 {
 	if (dev->platform_data != NULL)
 		return (struct s3c2410_platform_i2c *)dev->platform_data;
@@ -129,7 +130,7 @@ static inline void s3c24xx_i2c_master_complete(struct s3c24xx_i2c *i2c, int ret)
 
 	i2c->msg_ptr = 0;
 	i2c->msg = NULL;
-	i2c->msg_idx ++;
+	i2c->msg_idx++;
 	i2c->msg_num = 0;
 	if (ret)
 		i2c->msg_idx = ret;
@@ -140,19 +141,17 @@ static inline void s3c24xx_i2c_master_complete(struct s3c24xx_i2c *i2c, int ret)
 static inline void s3c24xx_i2c_disable_ack(struct s3c24xx_i2c *i2c)
 {
 	unsigned long tmp;
-	
+
 	tmp = readl(i2c->regs + S3C2410_IICCON);
 	writel(tmp & ~S3C2410_IICCON_ACKEN, i2c->regs + S3C2410_IICCON);
-
 }
 
 static inline void s3c24xx_i2c_enable_ack(struct s3c24xx_i2c *i2c)
 {
 	unsigned long tmp;
-	
+
 	tmp = readl(i2c->regs + S3C2410_IICCON);
 	writel(tmp | S3C2410_IICCON_ACKEN, i2c->regs + S3C2410_IICCON);
-
 }
 
 /* irq enable/disable functions */
@@ -160,7 +159,7 @@ static inline void s3c24xx_i2c_enable_ack(struct s3c24xx_i2c *i2c)
 static inline void s3c24xx_i2c_disable_irq(struct s3c24xx_i2c *i2c)
 {
 	unsigned long tmp;
-	
+
 	tmp = readl(i2c->regs + S3C2410_IICCON);
 	writel(tmp & ~S3C2410_IICCON_IRQEN, i2c->regs + S3C2410_IICCON);
 }
@@ -168,7 +167,7 @@ static inline void s3c24xx_i2c_disable_irq(struct s3c24xx_i2c *i2c)
 static inline void s3c24xx_i2c_enable_irq(struct s3c24xx_i2c *i2c)
 {
 	unsigned long tmp;
-	
+
 	tmp = readl(i2c->regs + S3C2410_IICCON);
 	writel(tmp | S3C2410_IICCON_IRQEN, i2c->regs + S3C2410_IICCON);
 }
@@ -176,10 +175,10 @@ static inline void s3c24xx_i2c_enable_irq(struct s3c24xx_i2c *i2c)
 
 /* s3c24xx_i2c_message_start
  *
- * put the start of a message onto the bus 
+ * put the start of a message onto the bus
 */
 
-static void s3c24xx_i2c_message_start(struct s3c24xx_i2c *i2c, 
+static void s3c24xx_i2c_message_start(struct s3c24xx_i2c *i2c,
 				      struct i2c_msg *msg)
 {
 	unsigned int addr = (msg->addr & 0x7f) << 1;
@@ -198,15 +197,15 @@ static void s3c24xx_i2c_message_start(struct s3c24xx_i2c *i2c,
 	if (msg->flags & I2C_M_REV_DIR_ADDR)
 		addr ^= 1;
 
-	// todo - check for wether ack wanted or not
+	/* todo - check for wether ack wanted or not */
 	s3c24xx_i2c_enable_ack(i2c);
 
 	iiccon = readl(i2c->regs + S3C2410_IICCON);
 	writel(stat, i2c->regs + S3C2410_IICSTAT);
-	
+
 	dev_dbg(i2c->dev, "START: %08lx to IICSTAT, %02x to DS\n", stat, addr);
 	writeb(addr, i2c->regs + S3C2410_IICDS);
-	
+
 	/* delay here to ensure the data byte has gotten onto the bus
 	 * before the transaction is started */
 
@@ -214,8 +213,8 @@ static void s3c24xx_i2c_message_start(struct s3c24xx_i2c *i2c,
 
 	dev_dbg(i2c->dev, "iiccon, %08lx\n", iiccon);
 	writel(iiccon, i2c->regs + S3C2410_IICCON);
-	
-	stat |=  S3C2410_IICSTAT_START;
+
+	stat |= S3C2410_IICSTAT_START;
 	writel(stat, i2c->regs + S3C2410_IICSTAT);
 }
 
@@ -226,11 +225,11 @@ static inline void s3c24xx_i2c_stop(struct s3c24xx_i2c *i2c, int ret)
 	dev_dbg(i2c->dev, "STOP\n");
 
 	/* stop the transfer */
-	iicstat &= ~ S3C2410_IICSTAT_START;
+	iicstat &= ~S3C2410_IICSTAT_START;
 	writel(iicstat, i2c->regs + S3C2410_IICSTAT);
-	
+
 	i2c->state = STATE_STOP;
-	
+
 	s3c24xx_i2c_master_complete(i2c, ret);
 	s3c24xx_i2c_disable_irq(i2c);
 }
@@ -240,7 +239,7 @@ static inline void s3c24xx_i2c_stop(struct s3c24xx_i2c *i2c, int ret)
 
 /* is_lastmsg()
  *
- * returns TRUE if the current message is the last in the set 
+ * returns TRUE if the current message is the last in the set
 */
 
 static inline int is_lastmsg(struct s3c24xx_i2c *i2c)
@@ -288,14 +287,14 @@ static int i2s_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat)
 
 	case STATE_STOP:
 		dev_err(i2c->dev, "%s: called in STATE_STOP\n", __func__);
-		s3c24xx_i2c_disable_irq(i2c);		
+		s3c24xx_i2c_disable_irq(i2c);
 		goto out_ack;
 
 	case STATE_START:
 		/* last thing we did was send a start condition on the
 		 * bus, or started a new i2c message
 		 */
-		
+
 		if (iicstat & S3C2410_IICSTAT_LASTBIT &&
 		    !(i2c->msg->flags & I2C_M_IGNORE_NAK)) {
 			/* ack was not received... */
@@ -321,7 +320,7 @@ static int i2s_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat)
 		if (i2c->state == STATE_READ)
 			goto prepare_read;
 
-		/* fall through to the write state, as we will need to 
+		/* fall through to the write state, as we will need to
 		 * send a byte as well */
 
 	case STATE_WRITE:
@@ -338,7 +337,7 @@ static int i2s_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat)
 			}
 		}
 
-	retry_write:
+ retry_write:
 
 		if (!is_msgend(i2c)) {
 			byte = i2c->msg->buf[i2c->msg_ptr++];
@@ -358,9 +357,9 @@ static int i2s_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat)
 			dev_dbg(i2c->dev, "WRITE: Next Message\n");
 
 			i2c->msg_ptr = 0;
-			i2c->msg_idx ++;
+			i2c->msg_idx++;
 			i2c->msg++;
-			
+
 			/* check to see if we need to do another message */
 			if (i2c->msg->flags & I2C_M_NOSTART) {
 
@@ -374,7 +373,6 @@ static int i2s_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat)
 
 				goto retry_write;
 			} else {
-			
 				/* send the new start */
 				s3c24xx_i2c_message_start(i2c, i2c->msg);
 				i2c->state = STATE_START;
@@ -388,7 +386,7 @@ static int i2s_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat)
 		break;
 
 	case STATE_READ:
-		/* we have a byte of data in the data register, do 
+		/* we have a byte of data in the data register, do
 		 * something with it, and then work out wether we are
 		 * going to do any more read/write
 		 */
@@ -396,13 +394,13 @@ static int i2s_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat)
 		byte = readb(i2c->regs + S3C2410_IICDS);
 		i2c->msg->buf[i2c->msg_ptr++] = byte;
 
-	prepare_read:
+ prepare_read:
 		if (is_msglast(i2c)) {
 			/* last byte of buffer */
 
 			if (is_lastmsg(i2c))
 				s3c24xx_i2c_disable_ack(i2c);
-			
+
 		} else if (is_msgend(i2c)) {
 			/* ok, we've read the entire buffer, see if there
 			 * is anything else we need to do */
@@ -428,7 +426,7 @@ static int i2s_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat)
 	/* acknowlegde the IRQ and get back on with the work */
 
  out_ack:
-	tmp = readl(i2c->regs + S3C2410_IICCON);	
+	tmp = readl(i2c->regs + S3C2410_IICCON);
 	tmp &= ~S3C2410_IICCON_IRQPEND;
 	writel(tmp, i2c->regs + S3C2410_IICCON);
  out:
@@ -449,19 +447,19 @@ static irqreturn_t s3c24xx_i2c_irq(int irqno, void *dev_id)
 	status = readl(i2c->regs + S3C2410_IICSTAT);
 
 	if (status & S3C2410_IICSTAT_ARBITR) {
-		// deal with arbitration loss
+		/* deal with arbitration loss */
 		dev_err(i2c->dev, "deal with arbitration loss\n");
 	}
 
 	if (i2c->state == STATE_IDLE) {
 		dev_dbg(i2c->dev, "IRQ: error i2c->state == IDLE\n");
 
-		tmp = readl(i2c->regs + S3C2410_IICCON);	
+		tmp = readl(i2c->regs + S3C2410_IICCON);
 		tmp &= ~S3C2410_IICCON_IRQPEND;
 		writel(tmp, i2c->regs +  S3C2410_IICCON);
 		goto out;
 	}
-	
+
 	/* pretty much this leaves us with the fact that we've
 	 * transmitted or received whatever byte we last sent */
 
@@ -484,7 +482,7 @@ static int s3c24xx_i2c_set_master(struct s3c24xx_i2c *i2c)
 
 	while (timeout-- > 0) {
 		iicstat = readl(i2c->regs + S3C2410_IICSTAT);
-		
+
 		if (!(iicstat & S3C2410_IICSTAT_BUSBUSY))
 			return 0;
 
@@ -502,7 +500,8 @@ static int s3c24xx_i2c_set_master(struct s3c24xx_i2c *i2c)
  * this starts an i2c transfer
 */
 
-static int s3c24xx_i2c_doxfer(struct s3c24xx_i2c *i2c, struct i2c_msg *msgs, int num)
+static int s3c24xx_i2c_doxfer(struct s3c24xx_i2c *i2c,
+			      struct i2c_msg *msgs, int num)
 {
 	unsigned long timeout;
 	int ret;
@@ -528,12 +527,12 @@ static int s3c24xx_i2c_doxfer(struct s3c24xx_i2c *i2c, struct i2c_msg *msgs, int
 	s3c24xx_i2c_enable_irq(i2c);
 	s3c24xx_i2c_message_start(i2c, msgs);
 	spin_unlock_irq(&i2c->lock);
-	
+
 	timeout = wait_event_timeout(i2c->wait, i2c->msg_num == 0, HZ * 5);
 
 	ret = i2c->msg_idx;
 
-	/* having these next two as dev_err() makes life very 
+	/* having these next two as dev_err() makes life very
 	 * noisy when doing an i2cdetect */
 
 	if (timeout == 0)
@@ -642,7 +641,7 @@ static inline int freq_acceptable(unsigned int freq, unsigned int wanted)
 {
 	int diff = freq - wanted;
 
-	return (diff >= -2 && diff <= 2);
+	return diff >= -2 && diff <= 2;
 }
 
 /* s3c24xx_i2c_clockrate
@@ -665,7 +664,7 @@ static int s3c24xx_i2c_clockrate(struct s3c24xx_i2c *i2c, unsigned int *got)
 
 	pdata = s3c24xx_i2c_get_platformdata(i2c->adap.dev.parent);
 	clkin /= 1000;		/* clkin now in KHz */
-     
+
 	dev_dbg(i2c->dev, "pdata %p, freq %lu %lu..%lu\n",
 		 pdata, pdata->bus_freq, pdata->min_freq, pdata->max_freq);
 
@@ -773,7 +772,7 @@ static inline void s3c24xx_i2c_deregister_cpufreq(struct s3c24xx_i2c *i2c)
 
 /* s3c24xx_i2c_init
  *
- * initialise the controller, set the IO lines and frequency 
+ * initialise the controller, set the IO lines and frequency
 */
 
 static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c)
@@ -792,7 +791,7 @@ static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c)
 	s3c2410_gpio_cfgpin(S3C2410_GPE14, S3C2410_GPE14_IICSCL);
 
 	/* write slave address */
-	
+
 	writeb(pdata->slave_addr, i2c->regs + S3C2410_IICADD);
 
 	dev_info(i2c->dev, "slave address 0x%02x\n", pdata->slave_addr);
@@ -877,7 +876,8 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
 		goto err_ioarea;
 	}
 
-	dev_dbg(&pdev->dev, "registers %p (%p, %p)\n", i2c->regs, i2c->ioarea, res);
+	dev_dbg(&pdev->dev, "registers %p (%p, %p)\n",
+		i2c->regs, i2c->ioarea, res);
 
 	/* setup info block for the i2c core */
 
@@ -891,7 +891,7 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
 		goto err_iomap;
 
 	/* find the IRQ for this unit (note, this relies on the init call to
-	 * ensure no current IRQs pending 
+	 * ensure no current IRQs pending
 	 */
 
 	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
@@ -910,7 +910,7 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
 	}
 
 	i2c->irq = res;
-		
+
 	dev_dbg(&pdev->dev, "irq resource %p (%lu)\n", res,
 		(unsigned long)res->start);
 
-- 
cgit v1.2.3-18-g5258


From 8be310a6dea491b28f81672752d9d2c7fc25cdd3 Mon Sep 17 00:00:00 2001
From: Ben Dooks <ben-linux@fluff.org>
Date: Fri, 31 Oct 2008 16:10:25 +0000
Subject: i2c-s3c2410: Use platform data for gpio configuration

Add a callback to set the gpio configuration for the
i2c device instead of a set include. This also allows
the remvoal of the machine gpio and hardware files.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
---
 drivers/i2c/busses/i2c-s3c2410.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

(limited to 'drivers')

diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index f5efece9b16..0aa0142de14 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -35,11 +35,9 @@
 #include <linux/clk.h>
 #include <linux/cpufreq.h>
 
-#include <mach/hardware.h>
 #include <asm/irq.h>
 #include <asm/io.h>
 
-#include <mach/regs-gpio.h>
 #include <asm/plat-s3c/regs-iic.h>
 #include <asm/plat-s3c/iic.h>
 
@@ -489,9 +487,6 @@ static int s3c24xx_i2c_set_master(struct s3c24xx_i2c *i2c)
 		msleep(1);
 	}
 
-	dev_dbg(i2c->dev, "timeout: GPEDAT is %08x\n",
-		__raw_readl(S3C2410_GPEDAT));
-
 	return -ETIMEDOUT;
 }
 
@@ -783,12 +778,12 @@ static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c)
 
 	/* get the plafrom data */
 
-	pdata = s3c24xx_i2c_get_platformdata(i2c->adap.dev.parent);
+	pdata = s3c24xx_i2c_get_platformdata(i2c->dev);
 
 	/* inititalise the gpio */
 
-	s3c2410_gpio_cfgpin(S3C2410_GPE15, S3C2410_GPE15_IICSDA);
-	s3c2410_gpio_cfgpin(S3C2410_GPE14, S3C2410_GPE14_IICSCL);
+	if (pdata->cfg_gpio)
+		pdata->cfg_gpio(to_platform_device(i2c->dev));
 
 	/* write slave address */
 
-- 
cgit v1.2.3-18-g5258


From 6a039cabba3ddd556643156ce0a7cd07da456b20 Mon Sep 17 00:00:00 2001
From: Ben Dooks <ben-linux@fluff.org>
Date: Fri, 31 Oct 2008 16:10:27 +0000
Subject: i2c-s3c2410: Remove default platform data.

The platform data should now always be present when the device
is initialised, so we can remove the default platform data in
the driver.

All the device initialisation points in the board specific code
should already have been changed to initialise this as necessary.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
---
 drivers/i2c/busses/i2c-s3c2410.c | 39 ++++++++-------------------------------
 1 file changed, 8 insertions(+), 31 deletions(-)

(limited to 'drivers')

diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index 0aa0142de14..d6343e2c588 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -77,16 +77,7 @@ struct s3c24xx_i2c {
 #endif
 };
 
-/* default platform data to use if not supplied in the platform_device
-*/
-
-static struct s3c2410_platform_i2c s3c24xx_i2c_default_platform = {
-	.flags		= 0,
-	.slave_addr	= 0x10,
-	.bus_freq	= 100*1000,
-	.max_freq	= 400*1000,
-	.sda_delay	= S3C2410_IICLC_SDA_DELAY5 | S3C2410_IICLC_FILTER_ON,
-};
+/* default platform data removed, dev should always carry data. */
 
 /* s3c24xx_i2c_is2440()
  *
@@ -100,22 +91,6 @@ static inline int s3c24xx_i2c_is2440(struct s3c24xx_i2c *i2c)
 	return !strcmp(pdev->name, "s3c2440-i2c");
 }
 
-
-/* s3c24xx_i2c_get_platformdata
- *
- * get the platform data associated with the given device, or return
- * the default if there is none
-*/
-
-static inline struct s3c2410_platform_i2c *
-s3c24xx_i2c_get_platformdata(struct device *dev)
-{
-	if (dev->platform_data != NULL)
-		return (struct s3c2410_platform_i2c *)dev->platform_data;
-
-	return &s3c24xx_i2c_default_platform;
-}
-
 /* s3c24xx_i2c_master_complete
  *
  * complete the message and wake up the caller, using the given return code,
@@ -648,7 +623,7 @@ static inline int freq_acceptable(unsigned int freq, unsigned int wanted)
 
 static int s3c24xx_i2c_clockrate(struct s3c24xx_i2c *i2c, unsigned int *got)
 {
-	struct s3c2410_platform_i2c *pdata;
+	struct s3c2410_platform_i2c *pdata = i2c->dev->platform_data;
 	unsigned long clkin = clk_get_rate(i2c->clk);
 	unsigned int divs, div1;
 	u32 iiccon;
@@ -656,8 +631,6 @@ static int s3c24xx_i2c_clockrate(struct s3c24xx_i2c *i2c, unsigned int *got)
 	int start, end;
 
 	i2c->clkrate = clkin;
-
-	pdata = s3c24xx_i2c_get_platformdata(i2c->adap.dev.parent);
 	clkin /= 1000;		/* clkin now in KHz */
 
 	dev_dbg(i2c->dev, "pdata %p, freq %lu %lu..%lu\n",
@@ -778,7 +751,7 @@ static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c)
 
 	/* get the plafrom data */
 
-	pdata = s3c24xx_i2c_get_platformdata(i2c->dev);
+	pdata = i2c->dev->platform_data;
 
 	/* inititalise the gpio */
 
@@ -829,7 +802,11 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
 	struct resource *res;
 	int ret;
 
-	pdata = s3c24xx_i2c_get_platformdata(&pdev->dev);
+	pdata = pdev->dev.platform_data;
+	if (!pdata) {
+		dev_err(&pdev->dev, "no platform data\n");
+		return -EINVAL;
+	}
 
 	/* find the clock and enable it */
 
-- 
cgit v1.2.3-18-g5258


From 692acbd3a866a9f84e18a5980b3a97ca52e501b2 Mon Sep 17 00:00:00 2001
From: Ben Dooks <ben-linux@fluff.org>
Date: Fri, 31 Oct 2008 16:10:28 +0000
Subject: i2c-s3c2410: Allow more than one i2c-s3c2410 adapter

Newer SoCs such as the S3C6410 have 2 instances of this i2c
controller block in and thus require the ability to create
two seperate busses from this.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
---
 drivers/i2c/busses/i2c-s3c2410.c | 33 +++++++++++++++++++--------------
 1 file changed, 19 insertions(+), 14 deletions(-)

(limited to 'drivers')

diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index d6343e2c588..f14007ff253 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -559,19 +559,6 @@ static const struct i2c_algorithm s3c24xx_i2c_algorithm = {
 	.functionality		= s3c24xx_i2c_func,
 };
 
-static struct s3c24xx_i2c s3c24xx_i2c = {
-	.lock		= __SPIN_LOCK_UNLOCKED(s3c24xx_i2c.lock),
-	.wait		= __WAIT_QUEUE_HEAD_INITIALIZER(s3c24xx_i2c.wait),
-	.tx_setup	= 50,
-	.adap		= {
-		.name			= "s3c2410-i2c",
-		.owner			= THIS_MODULE,
-		.algo			= &s3c24xx_i2c_algorithm,
-		.retries		= 2,
-		.class			= I2C_CLASS_HWMON | I2C_CLASS_SPD,
-	},
-};
-
 /* s3c24xx_i2c_calcdivisor
  *
  * return the divisor settings for a given frequency
@@ -797,7 +784,7 @@ static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c)
 
 static int s3c24xx_i2c_probe(struct platform_device *pdev)
 {
-	struct s3c24xx_i2c *i2c = &s3c24xx_i2c;
+	struct s3c24xx_i2c *i2c;
 	struct s3c2410_platform_i2c *pdata;
 	struct resource *res;
 	int ret;
@@ -808,6 +795,22 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
+	i2c = kzalloc(sizeof(struct s3c24xx_i2c), GFP_KERNEL);
+	if (!i2c) {
+		dev_err(&pdev->dev, "no memory for state\n");
+		return -ENOMEM;
+	}
+
+	strlcpy(i2c->adap.name, "s3c2410-i2c", sizeof(i2c->adap.name));
+	i2c->adap.owner   = THIS_MODULE;
+	i2c->adap.algo    = &s3c24xx_i2c_algorithm;
+	i2c->adap.retries = 2;
+	i2c->adap.class   = I2C_CLASS_HWMON | I2C_CLASS_SPD;
+	i2c->tx_setup     = 50;
+
+	spin_lock_init(&i2c->lock);
+	init_waitqueue_head(&i2c->wait);
+
 	/* find the clock and enable it */
 
 	i2c->dev = &pdev->dev;
@@ -929,6 +932,7 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
 	clk_put(i2c->clk);
 
  err_noclk:
+	kfree(i2c);
 	return ret;
 }
 
@@ -953,6 +957,7 @@ static int s3c24xx_i2c_remove(struct platform_device *pdev)
 
 	release_resource(i2c->ioarea);
 	kfree(i2c->ioarea);
+	kfree(i2c);
 
 	return 0;
 }
-- 
cgit v1.2.3-18-g5258


From e0d1ec97853fa09cf676dc6b51dafd35db12759e Mon Sep 17 00:00:00 2001
From: Ben Dooks <ben-linux@fluff.org>
Date: Fri, 31 Oct 2008 16:10:30 +0000
Subject: i2c-s3c2410: Change IRQ to be plain integer.

Change the code to use a plain integer as the holder
for the IRQ for the device and use platform_get_irq()
to find it.

This makes the code slightly neater, and easier to get
the IRQ number.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
---
 drivers/i2c/busses/i2c-s3c2410.c | 22 ++++++++--------------
 1 file changed, 8 insertions(+), 14 deletions(-)

(limited to 'drivers')

diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index f14007ff253..2a0de645ccf 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -61,6 +61,7 @@ struct s3c24xx_i2c {
 	unsigned int		msg_ptr;
 
 	unsigned int		tx_setup;
+	unsigned int		irq;
 
 	enum s3c24xx_i2c_state	state;
 	unsigned long		clkrate;
@@ -68,7 +69,6 @@ struct s3c24xx_i2c {
 	void __iomem		*regs;
 	struct clk		*clk;
 	struct device		*dev;
-	struct resource		*irq;
 	struct resource		*ioarea;
 	struct i2c_adapter	adap;
 
@@ -869,26 +869,20 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
 	 * ensure no current IRQs pending
 	 */
 
-	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (res == NULL) {
+	i2c->irq = ret = platform_get_irq(pdev, 0);
+	if (ret <= 0) {
 		dev_err(&pdev->dev, "cannot find IRQ\n");
-		ret = -ENOENT;
 		goto err_iomap;
 	}
 
-	ret = request_irq(res->start, s3c24xx_i2c_irq, IRQF_DISABLED,
-			  pdev->name, i2c);
+	ret = request_irq(i2c->irq, s3c24xx_i2c_irq, IRQF_DISABLED,
+			  dev_name(&pdev->dev), i2c);
 
 	if (ret != 0) {
-		dev_err(&pdev->dev, "cannot claim IRQ\n");
+		dev_err(&pdev->dev, "cannot claim IRQ %d\n", i2c->irq);
 		goto err_iomap;
 	}
 
-	i2c->irq = res;
-
-	dev_dbg(&pdev->dev, "irq resource %p (%lu)\n", res,
-		(unsigned long)res->start);
-
 	ret = s3c24xx_i2c_register_cpufreq(i2c);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to register cpufreq notifier\n");
@@ -918,7 +912,7 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
 	s3c24xx_i2c_deregister_cpufreq(i2c);
 
  err_irq:
-	free_irq(i2c->irq->start, i2c);
+	free_irq(i2c->irq, i2c);
 
  err_iomap:
 	iounmap(i2c->regs);
@@ -948,7 +942,7 @@ static int s3c24xx_i2c_remove(struct platform_device *pdev)
 	s3c24xx_i2c_deregister_cpufreq(i2c);
 
 	i2c_del_adapter(&i2c->adap);
-	free_irq(i2c->irq->start, i2c);
+	free_irq(i2c->irq, i2c);
 
 	clk_disable(i2c->clk);
 	clk_put(i2c->clk);
-- 
cgit v1.2.3-18-g5258


From e355204ef70181d28544ebb65a64969340ef4822 Mon Sep 17 00:00:00 2001
From: Ben Dooks <ben-linux@fluff.org>
Date: Tue, 16 Dec 2008 22:08:08 +0000
Subject: i2c-omap: fix type of irq handler function

The probe function used a pointer to the interrupt
handler to register as a 'void *', change it to the
proper type of irq_handler_t.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
---
 drivers/i2c/busses/i2c-omap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'drivers')

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 96f3bedb279..be8ee2cac8b 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -772,7 +772,7 @@ omap_i2c_probe(struct platform_device *pdev)
 	struct omap_i2c_dev	*dev;
 	struct i2c_adapter	*adap;
 	struct resource		*mem, *irq, *ioarea;
-	void *isr;
+	irq_handler_t isr;
 	int r;
 	u32 speed = 0;
 
-- 
cgit v1.2.3-18-g5258