When we set up the gpio fallback, we always have a 1:1 relationship
with an intel_gmbus. Exploit that to store all gpio related data in
there, too. This is a preparation step to merge the tw i2c adapters
controlling the same bus into one.
Just mundane code-munging in this patch.
Signed-Off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/intel_i2c.c | 144 +++++++++++++++++++-------------------
2 files changed, 72 insertions(+), 73 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index ed40743..f137b1d 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -294,6 +294,7 @@ struct intel_gmbus {
struct i2c_adapter adapter;
struct i2c_adapter *force_bit;
u32 reg0;
+ u32 gpio_reg;
struct drm_i915_private *dev_priv;
};
diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c
index f496510..b9f17cb 100644
--- a/drivers/gpu/drm/i915/intel_i2c.c
+++ b/drivers/gpu/drm/i915/intel_i2c.c
@@ -45,13 +45,6 @@ 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)
{
@@ -78,15 +71,15 @@ static void intel_i2c_quirk_set(struct drm_i915_private *dev_priv, bool enable)
I915_WRITE(DSPCLK_GATE_D, val);
}
-static u32 get_reserved(struct intel_gpio *gpio)
+static u32 get_reserved(struct intel_gmbus *bus)
{
- struct drm_i915_private *dev_priv = gpio->dev_priv;
+ struct drm_i915_private *dev_priv = bus->dev_priv;
struct drm_device *dev = dev_priv->dev;
u32 reserved = 0;
/* On most chips, these bits must be preserved in software. */
if (!IS_I830(dev) && !IS_845G(dev))
- reserved = I915_READ_NOTRACE(gpio->reg) &
+ reserved = I915_READ_NOTRACE(bus->gpio_reg) &
(GPIO_DATA_PULLUP_DISABLE |
GPIO_CLOCK_PULLUP_DISABLE);
@@ -95,29 +88,29 @@ static u32 get_reserved(struct intel_gpio *gpio)
static int get_clock(void *data)
{
- struct intel_gpio *gpio = data;
- struct drm_i915_private *dev_priv = gpio->dev_priv;
- u32 reserved = get_reserved(gpio);
- I915_WRITE_NOTRACE(gpio->reg, reserved | GPIO_CLOCK_DIR_MASK);
- I915_WRITE_NOTRACE(gpio->reg, reserved);
- return (I915_READ_NOTRACE(gpio->reg) & GPIO_CLOCK_VAL_IN) != 0;
+ struct intel_gmbus *bus = data;
+ struct drm_i915_private *dev_priv = bus->dev_priv;
+ u32 reserved = get_reserved(bus);
+ I915_WRITE_NOTRACE(bus->gpio_reg, reserved | GPIO_CLOCK_DIR_MASK);
+ I915_WRITE_NOTRACE(bus->gpio_reg, reserved);
+ return (I915_READ_NOTRACE(bus->gpio_reg) & GPIO_CLOCK_VAL_IN) != 0;
}
static int get_data(void *data)
{
- struct intel_gpio *gpio = data;
- struct drm_i915_private *dev_priv = gpio->dev_priv;
- u32 reserved = get_reserved(gpio);
- I915_WRITE_NOTRACE(gpio->reg, reserved | GPIO_DATA_DIR_MASK);
- I915_WRITE_NOTRACE(gpio->reg, reserved);
- return (I915_READ_NOTRACE(gpio->reg) & GPIO_DATA_VAL_IN) != 0;
+ struct intel_gmbus *bus = data;
+ struct drm_i915_private *dev_priv = bus->dev_priv;
+ u32 reserved = get_reserved(bus);
+ I915_WRITE_NOTRACE(bus->gpio_reg, reserved | GPIO_DATA_DIR_MASK);
+ I915_WRITE_NOTRACE(bus->gpio_reg, reserved);
+ return (I915_READ_NOTRACE(bus->gpio_reg) & GPIO_DATA_VAL_IN) != 0;
}
static void set_clock(void *data, int state_high)
{
- struct intel_gpio *gpio = data;
- struct drm_i915_private *dev_priv = gpio->dev_priv;
- u32 reserved = get_reserved(gpio);
+ struct intel_gmbus *bus = data;
+ struct drm_i915_private *dev_priv = bus->dev_priv;
+ u32 reserved = get_reserved(bus);
u32 clock_bits;
if (state_high)
@@ -126,15 +119,15 @@ static void set_clock(void *data, int state_high)
clock_bits = GPIO_CLOCK_DIR_OUT | GPIO_CLOCK_DIR_MASK |
GPIO_CLOCK_VAL_MASK;
- I915_WRITE_NOTRACE(gpio->reg, reserved | clock_bits);
- POSTING_READ(gpio->reg);
+ I915_WRITE_NOTRACE(bus->gpio_reg, reserved | clock_bits);
+ POSTING_READ(bus->gpio_reg);
}
static void set_data(void *data, int state_high)
{
- struct intel_gpio *gpio = data;
- struct drm_i915_private *dev_priv = gpio->dev_priv;
- u32 reserved = get_reserved(gpio);
+ struct intel_gmbus *bus = data;
+ struct drm_i915_private *dev_priv = bus->dev_priv;
+ u32 reserved = get_reserved(bus);
u32 data_bits;
if (state_high)
@@ -143,13 +136,14 @@ 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_NOTRACE(gpio->reg, reserved | data_bits);
- POSTING_READ(gpio->reg);
+ I915_WRITE_NOTRACE(bus->gpio_reg, reserved | data_bits);
+ POSTING_READ(bus->gpio_reg);
}
static struct i2c_adapter *
-intel_gpio_create(struct drm_i915_private *dev_priv, u32 pin)
+intel_gpio_create(struct intel_gmbus *bus, u32 pin)
{
+ struct drm_i915_private *dev_priv = bus->dev_priv;
static const int map_pin_to_reg[] = {
0,
GPIOB,
@@ -160,65 +154,69 @@ intel_gpio_create(struct drm_i915_private *dev_priv, u32 pin)
0,
GPIOF,
};
- struct intel_gpio *gpio;
+ struct i2c_adapter *adapter;
+ struct i2c_algo_bit_data *algo;
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)
+ adapter = kzalloc(sizeof(struct i2c_adapter), GFP_KERNEL);
+ if (adapter == NULL)
return NULL;
- gpio->reg = map_pin_to_reg[pin];
+ algo = kzalloc(sizeof(struct i2c_algo_bit_data), GFP_KERNEL);
+ if (algo == NULL)
+ goto out_adap;
+
+ bus->gpio_reg = map_pin_to_reg[pin];
if (HAS_PCH_SPLIT(dev_priv->dev))
- gpio->reg += PCH_GPIOA - GPIOA;
- gpio->dev_priv = dev_priv;
+ bus->gpio_reg += PCH_GPIOA - GPIOA;
- snprintf(gpio->adapter.name, sizeof(gpio->adapter.name),
+ snprintf(adapter->name, sizeof(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);
+ adapter->owner = THIS_MODULE;
+ adapter->algo_data = algo;
+ adapter->dev.parent = &dev_priv->dev->pdev->dev;
+ algo->setsda = set_data;
+ algo->setscl = set_clock;
+ algo->getsda = get_data;
+ algo->getscl = get_clock;
+ algo->udelay = I2C_RISEFALL_TIME;
+ algo->timeout = usecs_to_jiffies(2200);
+ algo->data = bus;
+
+ if (i2c_bit_add_bus(adapter))
+ goto out_algo;
+
+ return adapter;
+
+out_algo:
+ kfree(algo);
+out_adap:
+ kfree(adapter);
return NULL;
}
static int
-intel_i2c_quirk_xfer(struct drm_i915_private *dev_priv,
+intel_i2c_quirk_xfer(struct intel_gmbus *bus,
struct i2c_adapter *adapter,
struct i2c_msg *msgs,
int num)
{
- struct intel_gpio *gpio = container_of(adapter,
- struct intel_gpio,
- adapter);
+ struct drm_i915_private *dev_priv = bus->dev_priv;
int ret;
intel_i2c_reset(dev_priv->dev);
intel_i2c_quirk_set(dev_priv, true);
- set_data(gpio, 1);
- set_clock(gpio, 1);
+ set_data(bus, 1);
+ set_clock(bus, 1);
udelay(I2C_RISEFALL_TIME);
ret = adapter->algo->master_xfer(adapter, msgs, num);
- set_data(gpio, 1);
- set_clock(gpio, 1);
+ set_data(bus, 1);
+ set_clock(bus, 1);
intel_i2c_quirk_set(dev_priv, false);
return ret;
@@ -238,8 +236,7 @@ gmbus_xfer(struct i2c_adapter *adapter,
mutex_lock(&dev_priv->gmbus_mutex);
if (bus->force_bit) {
- ret = intel_i2c_quirk_xfer(dev_priv,
- bus->force_bit, msgs, num);
+ ret = intel_i2c_quirk_xfer(bus, bus->force_bit, msgs, num);
goto out;
}
@@ -334,11 +331,11 @@ timeout:
I915_WRITE(GMBUS0 + reg_offset, 0);
/* Hardware may not support GMBUS over these pins? Try GPIO bitbanging instead. */
- bus->force_bit = intel_gpio_create(dev_priv, bus->reg0 & 0xff);
+ bus->force_bit = intel_gpio_create(bus, bus->reg0 & 0xff);
if (!bus->force_bit)
ret = -ENOMEM;
else
- ret = intel_i2c_quirk_xfer(dev_priv, bus->force_bit, msgs, num);
+ ret = intel_i2c_quirk_xfer(bus, bus->force_bit, msgs, num);
out:
mutex_unlock(&dev_priv->gmbus_mutex);
return ret;
@@ -412,7 +409,7 @@ int intel_setup_gmbus(struct drm_device *dev)
bus->reg0 = i | GMBUS_RATE_100KHZ;
/* XXX force bit banging until GMBUS is fully debugged */
- bus->force_bit = intel_gpio_create(dev_priv, i);
+ bus->force_bit = intel_gpio_create(bus, i);
}
intel_i2c_reset(dev_priv->dev);
@@ -442,13 +439,13 @@ void intel_gmbus_force_bit(struct i2c_adapter *adapter, bool force_bit)
if (force_bit) {
if (bus->force_bit == NULL) {
- struct drm_i915_private *dev_priv = bus->dev_priv;
- bus->force_bit = intel_gpio_create(dev_priv,
+ bus->force_bit = intel_gpio_create(bus,
bus->reg0 & 0xff);
}
} else {
if (bus->force_bit) {
i2c_del_adapter(bus->force_bit);
+ kfree(bus->force_bit->algo);
kfree(bus->force_bit);
bus->force_bit = NULL;
}
@@ -467,6 +464,7 @@ void intel_teardown_gmbus(struct drm_device *dev)
struct intel_gmbus *bus = &dev_priv->gmbus[i];
if (bus->force_bit) {
i2c_del_adapter(bus->force_bit);
+ kfree(bus->force_bit->algo);
kfree(bus->force_bit);
}
i2c_del_adapter(&bus->adapter);
--
1.7.7.5
--
To unsubscribe from this list: send the line "unsubscribe linux-i2c" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
