/* Intel GPIO access functions */
-#define I2C_RISEFALL_TIME 20
+#define I2C_RISEFALL_TIME 10
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);
+ I915_WRITE(dev_priv->gpio_mmio_base + GMBUS0, 0);
}
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);
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)
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)
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 int
+intel_gpio_pre_xfer(struct i2c_adapter *adapter)
+{
+ struct intel_gmbus *bus = container_of(adapter,
+ struct intel_gmbus,
+ adapter);
+ struct drm_i915_private *dev_priv = bus->dev_priv;
+
+ intel_i2c_reset(dev_priv->dev);
+ intel_i2c_quirk_set(dev_priv, true);
+ set_data(bus, 1);
+ set_clock(bus, 1);
+ udelay(I2C_RISEFALL_TIME);
+ return 0;
}
-static struct i2c_adapter *
-intel_gpio_create(struct drm_i915_private *dev_priv, u32 pin)
+static void
+intel_gpio_post_xfer(struct i2c_adapter *adapter)
{
+ struct intel_gmbus *bus = container_of(adapter,
+ struct intel_gmbus,
+ adapter);
+ struct drm_i915_private *dev_priv = bus->dev_priv;
+
+ set_data(bus, 1);
+ set_clock(bus, 1);
+ intel_i2c_quirk_set(dev_priv, false);
+}
+
+static bool
+intel_gpio_setup(struct intel_gmbus *bus, u32 pin)
+{
+ struct drm_i915_private *dev_priv = bus->dev_priv;
static const int map_pin_to_reg[] = {
0,
GPIOB,
GPIOC,
GPIOD,
GPIOE,
- 0,
GPIOF,
+ 0,
};
- struct intel_gpio *gpio;
+ 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)
- 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;
+ return false;
+
+ algo = &bus->bit_algo;
+
+ bus->gpio_reg = map_pin_to_reg[pin];
+ bus->gpio_reg += dev_priv->gpio_mmio_base;
+
+ bus->adapter.algo_data = algo;
+ algo->setsda = set_data;
+ algo->setscl = set_clock;
+ algo->getsda = get_data;
+ algo->getscl = get_clock;
+ algo->pre_xfer = intel_gpio_pre_xfer;
+ algo->post_xfer = intel_gpio_post_xfer;
+ algo->udelay = I2C_RISEFALL_TIME;
+ algo->timeout = usecs_to_jiffies(2200);
+ algo->data = bus;
+
+ return true;
}
static int
-intel_i2c_quirk_xfer(struct drm_i915_private *dev_priv,
- struct i2c_adapter *adapter,
- struct i2c_msg *msgs,
- int num)
+gmbus_xfer_read(struct drm_i915_private *dev_priv, struct i2c_msg *msg,
+ bool last)
{
- struct intel_gpio *gpio = container_of(adapter,
- struct intel_gpio,
- adapter);
- int ret;
+ int reg_offset = dev_priv->gpio_mmio_base;
+ u16 len = msg->len;
+ u8 *buf = msg->buf;
+
+ I915_WRITE(GMBUS1 + reg_offset,
+ GMBUS_CYCLE_WAIT |
+ (last ? GMBUS_CYCLE_STOP : 0) |
+ (len << GMBUS_BYTE_COUNT_SHIFT) |
+ (msg->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))
+ return -ETIMEDOUT;
+ if (I915_READ(GMBUS2 + reg_offset) & GMBUS_SATOER)
+ return -ENXIO;
- intel_i2c_reset(dev_priv->dev);
+ val = I915_READ(GMBUS3 + reg_offset);
+ do {
+ *buf++ = val & 0xff;
+ val >>= 8;
+ } while (--len && ++loop < 4);
+ } while (len);
- intel_i2c_quirk_set(dev_priv, true);
- set_data(gpio, 1);
- set_clock(gpio, 1);
- udelay(I2C_RISEFALL_TIME);
+ return 0;
+}
- ret = adapter->algo->master_xfer(adapter, msgs, num);
+static int
+gmbus_xfer_write(struct drm_i915_private *dev_priv, struct i2c_msg *msg,
+ bool last)
+{
+ int reg_offset = dev_priv->gpio_mmio_base;
+ u16 len = msg->len;
+ u8 *buf = msg->buf;
+ 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,
+ GMBUS_CYCLE_WAIT |
+ (last ? GMBUS_CYCLE_STOP : 0) |
+ (msg->len << GMBUS_BYTE_COUNT_SHIFT) |
+ (msg->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))
+ return -ETIMEDOUT;
+ if (I915_READ(GMBUS2 + reg_offset) & GMBUS_SATOER)
+ return -ENXIO;
- set_data(gpio, 1);
- set_clock(gpio, 1);
- intel_i2c_quirk_set(dev_priv, false);
+ val = loop = 0;
+ do {
+ val |= *buf++ << (8 * loop);
+ } while (--len && ++loop < 4);
- return ret;
+ I915_WRITE(GMBUS3 + reg_offset, val);
+ POSTING_READ(GMBUS2 + reg_offset);
+ }
+ return 0;
}
static int
struct intel_gmbus *bus = container_of(adapter,
struct intel_gmbus,
adapter);
- struct drm_i915_private *dev_priv = adapter->algo_data;
- int i, reg_offset;
+ struct drm_i915_private *dev_priv = bus->dev_priv;
+ int i, reg_offset, ret;
- if (bus->force_bit)
- return intel_i2c_quirk_xfer(dev_priv,
- bus->force_bit, msgs, num);
+ mutex_lock(&dev_priv->gmbus_mutex);
- reg_offset = HAS_PCH_SPLIT(dev_priv->dev) ? PCH_GMBUS0 - GMBUS0 : 0;
+ if (bus->force_bit) {
+ ret = i2c_bit_algo.master_xfer(adapter, msgs, num);
+ goto out;
+ }
+
+ reg_offset = dev_priv->gpio_mmio_base;
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)
- goto clear_err;
-
- 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)
- goto clear_err;
-
- 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))
+ bool last = i + 1 == num;
+
+ if (msgs[i].flags & I2C_M_RD)
+ ret = gmbus_xfer_read(dev_priv, &msgs[i], last);
+ else
+ ret = gmbus_xfer_write(dev_priv, &msgs[i], last);
+
+ if (ret == -ETIMEDOUT)
+ goto timeout;
+ if (ret == -ENXIO)
+ goto clear_err;
+
+ if (!last &&
+ wait_for(I915_READ(GMBUS2 + reg_offset) &
+ (GMBUS_SATOER | GMBUS_HW_WAIT_PHASE),
+ 50))
goto timeout;
if (I915_READ(GMBUS2 + reg_offset) & GMBUS_SATOER)
goto clear_err;
I915_WRITE(GMBUS1 + reg_offset, 0);
done:
- /* Mark the GMBUS interface as disabled. We will re-enable it at the
- * start of the next xfer, till then let it sleep.
+ /* Mark the GMBUS interface as disabled after waiting for idle.
+ * We will re-enable it at the start of the next xfer,
+ * till then let it sleep.
*/
+ if (wait_for((I915_READ(GMBUS2 + reg_offset) & GMBUS_ACTIVE) == 0, 10))
+ DRM_INFO("GMBUS [%s] timed out waiting for idle\n",
+ bus->adapter.name);
I915_WRITE(GMBUS0 + reg_offset, 0);
- return i;
+ ret = i;
+ goto out;
timeout:
- DRM_INFO("GMBUS timed out, falling back to bit banging on pin %d [%s]\n",
- bus->reg0 & 0xff, bus->adapter.name);
+ DRM_INFO("GMBUS [%s] timed out, falling back to bit banging on pin %d\n",
+ bus->adapter.name, bus->reg0 & 0xff);
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);
- if (!bus->force_bit)
- return -ENOMEM;
+ /* Hardware may not support GMBUS over these pins?
+ * Try GPIO bitbanging instead.
+ */
+ if (!bus->has_gpio) {
+ ret = -EIO;
+ } else {
+ bus->force_bit = true;
+ ret = i2c_bit_algo.master_xfer(adapter, msgs, num);
+ }
- return intel_i2c_quirk_xfer(dev_priv, bus->force_bit, msgs, num);
+out:
+ mutex_unlock(&dev_priv->gmbus_mutex);
+ return ret;
}
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 |
+ return i2c_bit_algo.functionality(adapter) &
+ (I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
/* I2C_FUNC_10BIT_ADDR | */
I2C_FUNC_SMBUS_READ_BLOCK_DATA |
I2C_FUNC_SMBUS_BLOCK_PROC_CALL);
"panel",
"dpc",
"dpb",
- "reserved",
"dpd",
+ "reserved",
};
struct drm_i915_private *dev_priv = dev->dev_private;
int ret, i;
- dev_priv->gmbus = kcalloc(sizeof(struct intel_gmbus), GMBUS_NUM_PORTS,
+ if (HAS_PCH_SPLIT(dev))
+ dev_priv->gpio_mmio_base = PCH_GPIOA - GPIOA;
+ else
+ dev_priv->gpio_mmio_base = 0;
+
+ dev_priv->gmbus = kcalloc(GMBUS_NUM_PORTS, sizeof(struct intel_gmbus),
GFP_KERNEL);
if (dev_priv->gmbus == NULL)
return -ENOMEM;
+ mutex_init(&dev_priv->gmbus_mutex);
+
for (i = 0; i < GMBUS_NUM_PORTS; i++) {
struct intel_gmbus *bus = &dev_priv->gmbus[i];
names[i]);
bus->adapter.dev.parent = &dev->pdev->dev;
- bus->adapter.algo_data = dev_priv;
+ bus->dev_priv = dev_priv;
bus->adapter.algo = &gmbus_algorithm;
ret = i2c_add_adapter(&bus->adapter);
/* 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);
+ bus->has_gpio = intel_gpio_setup(bus, i);
}
intel_i2c_reset(dev_priv->dev);
{
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;
- }
- }
+ if (bus->has_gpio)
+ bus->force_bit = force_bit;
}
void intel_teardown_gmbus(struct drm_device *dev)
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);
}
projects / ~andy / linux / blobdiff