1 files changed, 358 insertions, 127 deletions

diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c
index c2649c7df14c..3dba086e7eea 100644
--- a/drivers/gpu/drm/i915/intel_i2c.c
+++ b/drivers/gpu/drm/i915/intel_i2c.c
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2006 Dave Airlie <airlied@linux.ie>
- * Copyright © 2006-2008 Intel Corporation
+ * Copyright © 2006-2008,2010 Intel Corporation
  *   Jesse Barnes <jesse.barnes@intel.com>
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
@@ -24,10 +24,9 @@
  *
  * Authors:
  *	Eric Anholt <eric@anholt.net>
+ *	Chris Wilson <chris@chris-wilson.co.uk>
  */
 #include <linux/i2c.h>
-#include <linux/slab.h>
-#include <linux/i2c-id.h>
 #include <linux/i2c-algo-bit.h>
 #include "drmP.h"
 #include "drm.h"
@@ -35,79 +34,106 @@
 #include "i915_drm.h"
 #include "i915_drv.h"
 
-void intel_i2c_quirk_set(struct drm_device *dev, bool enable)
+/* Intel GPIO access functions */
+
+#define I2C_RISEFALL_TIME 20
+
+static inline struct intel_gmbus *
+to_intel_gmbus(struct i2c_adapter *i2c)
+{
+	return container_of(i2c, struct intel_gmbus, adapter);
+}
+
+struct intel_gpio {
+	struct i2c_adapter adapter;
+	struct i2c_algo_bit_data algo;
+	struct drm_i915_private *dev_priv;
+	u32 reg;
+};
+
+void
+intel_i2c_reset(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
+	if (HAS_PCH_SPLIT(dev))
+		I915_WRITE(PCH_GMBUS0, 0);
+	else
+		I915_WRITE(GMBUS0, 0);
+}
+
+static void intel_i2c_quirk_set(struct drm_i915_private *dev_priv, bool enable)
+{
+	u32 val;
 
 	/* When using bit bashing for I2C, this bit needs to be set to 1 */
-	if (!IS_PINEVIEW(dev))
+	if (!IS_PINEVIEW(dev_priv->dev))
 		return;
+
+	val = I915_READ(DSPCLK_GATE_D);
 	if (enable)
-		I915_WRITE(DSPCLK_GATE_D,
-			I915_READ(DSPCLK_GATE_D) | DPCUNIT_CLOCK_GATE_DISABLE);
+		val |= DPCUNIT_CLOCK_GATE_DISABLE;
 	else
-		I915_WRITE(DSPCLK_GATE_D,
-			I915_READ(DSPCLK_GATE_D) & (~DPCUNIT_CLOCK_GATE_DISABLE));
+		val &= ~DPCUNIT_CLOCK_GATE_DISABLE;
+	I915_WRITE(DSPCLK_GATE_D, val);
 }
 
-/*
- * Intel GPIO access functions
- */
+static u32 get_reserved(struct intel_gpio *gpio)
+{
+	struct drm_i915_private *dev_priv = gpio->dev_priv;
+	struct drm_device *dev = dev_priv->dev;
+	u32 reserved = 0;
 
-#define I2C_RISEFALL_TIME 20
+	/* On most chips, these bits must be preserved in software. */
+	if (!IS_I830(dev) && !IS_845G(dev))
+		reserved = I915_READ(gpio->reg) & (GPIO_DATA_PULLUP_DISABLE |
+						   GPIO_CLOCK_PULLUP_DISABLE);
+
+	return reserved;
+}
 
 static int get_clock(void *data)
 {
-	struct intel_i2c_chan *chan = data;
-	struct drm_i915_private *dev_priv = chan->drm_dev->dev_private;
-	u32 val;
-
-	val = I915_READ(chan->reg);
-	return ((val & GPIO_CLOCK_VAL_IN) != 0);
+	struct intel_gpio *gpio = data;
+	struct drm_i915_private *dev_priv = gpio->dev_priv;
+	u32 reserved = get_reserved(gpio);
+	I915_WRITE(gpio->reg, reserved | GPIO_CLOCK_DIR_MASK);
+	I915_WRITE(gpio->reg, reserved);
+	return (I915_READ(gpio->reg) & GPIO_CLOCK_VAL_IN) != 0;
 }
 
 static int get_data(void *data)
 {
-	struct intel_i2c_chan *chan = data;
-	struct drm_i915_private *dev_priv = chan->drm_dev->dev_private;
-	u32 val;
-
-	val = I915_READ(chan->reg);
-	return ((val & GPIO_DATA_VAL_IN) != 0);
+	struct intel_gpio *gpio = data;
+	struct drm_i915_private *dev_priv = gpio->dev_priv;
+	u32 reserved = get_reserved(gpio);
+	I915_WRITE(gpio->reg, reserved | GPIO_DATA_DIR_MASK);
+	I915_WRITE(gpio->reg, reserved);
+	return (I915_READ(gpio->reg) & GPIO_DATA_VAL_IN) != 0;
 }
 
 static void set_clock(void *data, int state_high)
 {
-	struct intel_i2c_chan *chan = data;
-	struct drm_device *dev = chan->drm_dev;
-	struct drm_i915_private *dev_priv = chan->drm_dev->dev_private;
-	u32 reserved = 0, clock_bits;
-
-	/* On most chips, these bits must be preserved in software. */
-	if (!IS_I830(dev) && !IS_845G(dev))
-		reserved = I915_READ(chan->reg) & (GPIO_DATA_PULLUP_DISABLE |
-						   GPIO_CLOCK_PULLUP_DISABLE);
+	struct intel_gpio *gpio = data;
+	struct drm_i915_private *dev_priv = gpio->dev_priv;
+	u32 reserved = get_reserved(gpio);
+	u32 clock_bits;
 
 	if (state_high)
 		clock_bits = GPIO_CLOCK_DIR_IN | GPIO_CLOCK_DIR_MASK;
 	else
 		clock_bits = GPIO_CLOCK_DIR_OUT | GPIO_CLOCK_DIR_MASK |
 			GPIO_CLOCK_VAL_MASK;
-	I915_WRITE(chan->reg, reserved | clock_bits);
-	udelay(I2C_RISEFALL_TIME); /* wait for the line to change state */
+
+	I915_WRITE(gpio->reg, reserved | clock_bits);
+	POSTING_READ(gpio->reg);
 }
 
 static void set_data(void *data, int state_high)
 {
-	struct intel_i2c_chan *chan = data;
-	struct drm_device *dev = chan->drm_dev;
-	struct drm_i915_private *dev_priv = chan->drm_dev->dev_private;
-	u32 reserved = 0, data_bits;
-
-	/* On most chips, these bits must be preserved in software. */
-	if (!IS_I830(dev) && !IS_845G(dev))
-		reserved = I915_READ(chan->reg) & (GPIO_DATA_PULLUP_DISABLE |
-						   GPIO_CLOCK_PULLUP_DISABLE);
+	struct intel_gpio *gpio = data;
+	struct drm_i915_private *dev_priv = gpio->dev_priv;
+	u32 reserved = get_reserved(gpio);
+	u32 data_bits;
 
 	if (state_high)
 		data_bits = GPIO_DATA_DIR_IN | GPIO_DATA_DIR_MASK;
@@ -115,109 +141,314 @@ static void set_data(void *data, int state_high)
 		data_bits = GPIO_DATA_DIR_OUT | GPIO_DATA_DIR_MASK |
 			GPIO_DATA_VAL_MASK;
 
-	I915_WRITE(chan->reg, reserved | data_bits);
-	udelay(I2C_RISEFALL_TIME); /* wait for the line to change state */
+	I915_WRITE(gpio->reg, reserved | data_bits);
+	POSTING_READ(gpio->reg);
 }
 
-/* Clears the GMBUS setup.  Our driver doesn't make use of the GMBUS I2C
- * engine, but if the BIOS leaves it enabled, then that can break our use
- * of the bit-banging I2C interfaces.  This is notably the case with the
- * Mac Mini in EFI mode.
- */
-void
-intel_i2c_reset_gmbus(struct drm_device *dev)
+static struct i2c_adapter *
+intel_gpio_create(struct drm_i915_private *dev_priv, u32 pin)
 {
-	struct drm_i915_private *dev_priv = dev->dev_private;
+	static const int map_pin_to_reg[] = {
+		0,
+		GPIOB,
+		GPIOA,
+		GPIOC,
+		GPIOD,
+		GPIOE,
+		0,
+		GPIOF,
+	};
+	struct intel_gpio *gpio;
 
-	if (HAS_PCH_SPLIT(dev)) {
-		I915_WRITE(PCH_GMBUS0, 0);
-	} else {
-		I915_WRITE(GMBUS0, 0);
+	if (pin >= ARRAY_SIZE(map_pin_to_reg) || !map_pin_to_reg[pin])
+		return NULL;
+
+	gpio = kzalloc(sizeof(struct intel_gpio), GFP_KERNEL);
+	if (gpio == NULL)
+		return NULL;
+
+	gpio->reg = map_pin_to_reg[pin];
+	if (HAS_PCH_SPLIT(dev_priv->dev))
+		gpio->reg += PCH_GPIOA - GPIOA;
+	gpio->dev_priv = dev_priv;
+
+	snprintf(gpio->adapter.name, sizeof(gpio->adapter.name),
+		 "i915 GPIO%c", "?BACDE?F"[pin]);
+	gpio->adapter.owner = THIS_MODULE;
+	gpio->adapter.algo_data	= &gpio->algo;
+	gpio->adapter.dev.parent = &dev_priv->dev->pdev->dev;
+	gpio->algo.setsda = set_data;
+	gpio->algo.setscl = set_clock;
+	gpio->algo.getsda = get_data;
+	gpio->algo.getscl = get_clock;
+	gpio->algo.udelay = I2C_RISEFALL_TIME;
+	gpio->algo.timeout = usecs_to_jiffies(2200);
+	gpio->algo.data = gpio;
+
+	if (i2c_bit_add_bus(&gpio->adapter))
+		goto out_free;
+
+	return &gpio->adapter;
+
+out_free:
+	kfree(gpio);
+	return NULL;
+}
+
+static int
+intel_i2c_quirk_xfer(struct drm_i915_private *dev_priv,
+		     struct i2c_adapter *adapter,
+		     struct i2c_msg *msgs,
+		     int num)
+{
+	struct intel_gpio *gpio = container_of(adapter,
+					       struct intel_gpio,
+					       adapter);
+	int ret;
+
+	intel_i2c_reset(dev_priv->dev);
+
+	intel_i2c_quirk_set(dev_priv, true);
+	set_data(gpio, 1);
+	set_clock(gpio, 1);
+	udelay(I2C_RISEFALL_TIME);
+
+	ret = adapter->algo->master_xfer(adapter, msgs, num);
+
+	set_data(gpio, 1);
+	set_clock(gpio, 1);
+	intel_i2c_quirk_set(dev_priv, false);
+
+	return ret;
+}
+
+static int
+gmbus_xfer(struct i2c_adapter *adapter,
+	   struct i2c_msg *msgs,
+	   int num)
+{
+	struct intel_gmbus *bus = container_of(adapter,
+					       struct intel_gmbus,
+					       adapter);
+	struct drm_i915_private *dev_priv = adapter->algo_data;
+	int i, reg_offset;
+
+	if (bus->force_bit)
+		return intel_i2c_quirk_xfer(dev_priv,
+					    bus->force_bit, msgs, num);
+
+	reg_offset = HAS_PCH_SPLIT(dev_priv->dev) ? PCH_GMBUS0 - GMBUS0 : 0;
+
+	I915_WRITE(GMBUS0 + reg_offset, bus->reg0);
+
+	for (i = 0; i < num; i++) {
+		u16 len = msgs[i].len;
+		u8 *buf = msgs[i].buf;
+
+		if (msgs[i].flags & I2C_M_RD) {
+			I915_WRITE(GMBUS1 + reg_offset,
+				   GMBUS_CYCLE_WAIT | (i + 1 == num ? GMBUS_CYCLE_STOP : 0) |
+				   (len << GMBUS_BYTE_COUNT_SHIFT) |
+				   (msgs[i].addr << GMBUS_SLAVE_ADDR_SHIFT) |
+				   GMBUS_SLAVE_READ | GMBUS_SW_RDY);
+			POSTING_READ(GMBUS2+reg_offset);
+			do {
+				u32 val, loop = 0;
+
+				if (wait_for(I915_READ(GMBUS2 + reg_offset) & (GMBUS_SATOER | GMBUS_HW_RDY), 50))
+					goto timeout;
+				if (I915_READ(GMBUS2 + reg_offset) & GMBUS_SATOER)
+					return 0;
+
+				val = I915_READ(GMBUS3 + reg_offset);
+				do {
+					*buf++ = val & 0xff;
+					val >>= 8;
+				} while (--len && ++loop < 4);
+			} while (len);
+		} else {
+			u32 val, loop;
+
+			val = loop = 0;
+			do {
+				val |= *buf++ << (8 * loop);
+			} while (--len && ++loop < 4);
+
+			I915_WRITE(GMBUS3 + reg_offset, val);
+			I915_WRITE(GMBUS1 + reg_offset,
+				   (i + 1 == num ? GMBUS_CYCLE_STOP : GMBUS_CYCLE_WAIT) |
+				   (msgs[i].len << GMBUS_BYTE_COUNT_SHIFT) |
+				   (msgs[i].addr << GMBUS_SLAVE_ADDR_SHIFT) |
+				   GMBUS_SLAVE_WRITE | GMBUS_SW_RDY);
+			POSTING_READ(GMBUS2+reg_offset);
+
+			while (len) {
+				if (wait_for(I915_READ(GMBUS2 + reg_offset) & (GMBUS_SATOER | GMBUS_HW_RDY), 50))
+					goto timeout;
+				if (I915_READ(GMBUS2 + reg_offset) & GMBUS_SATOER)
+					return 0;
+
+				val = loop = 0;
+				do {
+					val |= *buf++ << (8 * loop);
+				} while (--len && ++loop < 4);
+
+				I915_WRITE(GMBUS3 + reg_offset, val);
+				POSTING_READ(GMBUS2+reg_offset);
+			}
+		}
+
+		if (i + 1 < num && wait_for(I915_READ(GMBUS2 + reg_offset) & (GMBUS_SATOER | GMBUS_HW_WAIT_PHASE), 50))
+			goto timeout;
+		if (I915_READ(GMBUS2 + reg_offset) & GMBUS_SATOER)
+			return 0;
 	}
+
+	return num;
+
+timeout:
+	DRM_INFO("GMBUS timed out, falling back to bit banging on pin %d [%s]\n",
+		 bus->reg0 & 0xff, bus->adapter.name);
+	/* Hardware may not support GMBUS over these pins? Try GPIO bitbanging instead. */
+	bus->force_bit = intel_gpio_create(dev_priv, bus->reg0 & 0xff);
+	if (!bus->force_bit)
+		return -ENOMEM;
+
+	return intel_i2c_quirk_xfer(dev_priv, bus->force_bit, msgs, num);
 }
 
+static u32 gmbus_func(struct i2c_adapter *adapter)
+{
+	struct intel_gmbus *bus = container_of(adapter,
+					       struct intel_gmbus,
+					       adapter);
+
+	if (bus->force_bit)
+		bus->force_bit->algo->functionality(bus->force_bit);
+
+	return (I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
+		/* I2C_FUNC_10BIT_ADDR | */
+		I2C_FUNC_SMBUS_READ_BLOCK_DATA |
+		I2C_FUNC_SMBUS_BLOCK_PROC_CALL);
+}
+
+static const struct i2c_algorithm gmbus_algorithm = {
+	.master_xfer	= gmbus_xfer,
+	.functionality	= gmbus_func
+};
+
 /**
- * intel_i2c_create - instantiate an Intel i2c bus using the specified GPIO reg
+ * intel_gmbus_setup - instantiate all Intel i2c GMBuses
  * @dev: DRM device
- * @output: driver specific output device
- * @reg: GPIO reg to use
- * @name: name for this bus
- * @slave_addr: slave address (if fixed)
- *
- * Creates and registers a new i2c bus with the Linux i2c layer, for use
- * in output probing and control (e.g. DDC or SDVO control functions).
- *
- * Possible values for @reg include:
- *   %GPIOA
- *   %GPIOB
- *   %GPIOC
- *   %GPIOD
- *   %GPIOE
- *   %GPIOF
- *   %GPIOG
- *   %GPIOH
- * see PRM for details on how these different busses are used.
  */
-struct i2c_adapter *intel_i2c_create(struct drm_device *dev, const u32 reg,
-				     const char *name)
+int intel_setup_gmbus(struct drm_device *dev)
 {
-	struct intel_i2c_chan *chan;
+	static const char *names[GMBUS_NUM_PORTS] = {
+		"disabled",
+		"ssc",
+		"vga",
+		"panel",
+		"dpc",
+		"dpb",
+		"reserved",
+		"dpd",
+	};
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	int ret, i;
 
-	chan = kzalloc(sizeof(struct intel_i2c_chan), GFP_KERNEL);
-	if (!chan)
-		goto out_free;
+	dev_priv->gmbus = kcalloc(sizeof(struct intel_gmbus), GMBUS_NUM_PORTS,
+				  GFP_KERNEL);
+	if (dev_priv->gmbus == NULL)
+		return -ENOMEM;
 
-	chan->drm_dev = dev;
-	chan->reg = reg;
-	snprintf(chan->adapter.name, I2C_NAME_SIZE, "intel drm %s", name);
-	chan->adapter.owner = THIS_MODULE;
-	chan->adapter.algo_data	= &chan->algo;
-	chan->adapter.dev.parent = &dev->pdev->dev;
-	chan->algo.setsda = set_data;
-	chan->algo.setscl = set_clock;
-	chan->algo.getsda = get_data;
-	chan->algo.getscl = get_clock;
-	chan->algo.udelay = 20;
-	chan->algo.timeout = usecs_to_jiffies(2200);
-	chan->algo.data = chan;
-
-	i2c_set_adapdata(&chan->adapter, chan);
-
-	if(i2c_bit_add_bus(&chan->adapter))
-		goto out_free;
+	for (i = 0; i < GMBUS_NUM_PORTS; i++) {
+		struct intel_gmbus *bus = &dev_priv->gmbus[i];
 
-	intel_i2c_reset_gmbus(dev);
+		bus->adapter.owner = THIS_MODULE;
+		bus->adapter.class = I2C_CLASS_DDC;
+		snprintf(bus->adapter.name,
+			 sizeof(bus->adapter.name),
+			 "i915 gmbus %s",
+			 names[i]);
 
-	/* JJJ:  raise SCL and SDA? */
-	intel_i2c_quirk_set(dev, true);
-	set_data(chan, 1);
-	set_clock(chan, 1);
-	intel_i2c_quirk_set(dev, false);
-	udelay(20);
+		bus->adapter.dev.parent = &dev->pdev->dev;
+		bus->adapter.algo_data	= dev_priv;
 
-	return &chan->adapter;
+		bus->adapter.algo = &gmbus_algorithm;
+		ret = i2c_add_adapter(&bus->adapter);
+		if (ret)
+			goto err;
 
-out_free:
-	kfree(chan);
-	return NULL;
+		/* By default use a conservative clock rate */
+		bus->reg0 = i | GMBUS_RATE_100KHZ;
+
+		/* XXX force bit banging until GMBUS is fully debugged */
+		bus->force_bit = intel_gpio_create(dev_priv, i);
+	}
+
+	intel_i2c_reset(dev_priv->dev);
+
+	return 0;
+
+err:
+	while (--i) {
+		struct intel_gmbus *bus = &dev_priv->gmbus[i];
+		i2c_del_adapter(&bus->adapter);
+	}
+	kfree(dev_priv->gmbus);
+	dev_priv->gmbus = NULL;
+	return ret;
 }
 
-/**
- * intel_i2c_destroy - unregister and free i2c bus resources
- * @output: channel to free
- *
- * Unregister the adapter from the i2c layer, then free the structure.
- */
-void intel_i2c_destroy(struct i2c_adapter *adapter)
+void intel_gmbus_set_speed(struct i2c_adapter *adapter, int speed)
+{
+	struct intel_gmbus *bus = to_intel_gmbus(adapter);
+
+	/* speed:
+	 * 0x0 = 100 KHz
+	 * 0x1 = 50 KHz
+	 * 0x2 = 400 KHz
+	 * 0x3 = 1000 Khz
+	 */
+	bus->reg0 = (bus->reg0 & ~(0x3 << 8)) | (speed << 8);
+}
+
+void intel_gmbus_force_bit(struct i2c_adapter *adapter, bool force_bit)
+{
+	struct intel_gmbus *bus = to_intel_gmbus(adapter);
+
+	if (force_bit) {
+		if (bus->force_bit == NULL) {
+			struct drm_i915_private *dev_priv = adapter->algo_data;
+			bus->force_bit = intel_gpio_create(dev_priv,
+							   bus->reg0 & 0xff);
+		}
+	} else {
+		if (bus->force_bit) {
+			i2c_del_adapter(bus->force_bit);
+			kfree(bus->force_bit);
+			bus->force_bit = NULL;
+		}
+	}
+}
+
+void intel_teardown_gmbus(struct drm_device *dev)
 {
-	struct intel_i2c_chan *chan;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	int i;
 
-	if (!adapter)
+	if (dev_priv->gmbus == NULL)
 		return;
 
-	chan = container_of(adapter,
-			    struct intel_i2c_chan,
-			    adapter);
-	i2c_del_adapter(&chan->adapter);
-	kfree(chan);
+	for (i = 0; i < GMBUS_NUM_PORTS; i++) {
+		struct intel_gmbus *bus = &dev_priv->gmbus[i];
+		if (bus->force_bit) {
+			i2c_del_adapter(bus->force_bit);
+			kfree(bus->force_bit);
+		}
+		i2c_del_adapter(&bus->adapter);
+	}
+
+	kfree(dev_priv->gmbus);
+	dev_priv->gmbus = NULL;
 }