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drm/gma500: Add aux device support for gmbus

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Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
This commit is contained in:
Patrik Jakobsson 2013-09-16 18:36:37 +02:00
parent 2657929d4e
commit 86bd410325
1 changed files with 49 additions and 41 deletions
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90
drivers/gpu/drm/gma500/intel_gmbus.c
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@ -51,6 +51,9 @@
#define wait_for(COND, MS) _wait_for(COND, MS, 1)
#define wait_for_atomic(COND, MS) _wait_for(COND, MS, 0)
#define GMBUS_REG_READ(reg) ioread32(dev_priv->gmbus_reg + (reg))
#define GMBUS_REG_WRITE(reg, val) iowrite32((val), dev_priv->gmbus_reg + (reg))
/* Intel GPIO access functions */
#define I2C_RISEFALL_TIME 20
@ -71,7 +74,8 @@ struct intel_gpio {
void
gma_intel_i2c_reset(struct drm_device *dev)
{
REG_WRITE(GMBUS0, 0);
struct drm_psb_private *dev_priv = dev->dev_private;
GMBUS_REG_WRITE(GMBUS0, 0);
}
static void intel_i2c_quirk_set(struct drm_psb_private *dev_priv, bool enable)
@ -98,11 +102,10 @@ static void intel_i2c_quirk_set(struct drm_psb_private *dev_priv, bool enable)
static u32 get_reserved(struct intel_gpio *gpio)
{
struct drm_psb_private *dev_priv = gpio->dev_priv;
struct drm_device *dev = dev_priv->dev;
u32 reserved = 0;
/* On most chips, these bits must be preserved in software. */
reserved = REG_READ(gpio->reg) &
reserved = GMBUS_REG_READ(gpio->reg) &
(GPIO_DATA_PULLUP_DISABLE |
GPIO_CLOCK_PULLUP_DISABLE);
@ -113,29 +116,26 @@ static int get_clock(void *data)
{
struct intel_gpio *gpio = data;
struct drm_psb_private *dev_priv = gpio->dev_priv;
struct drm_device *dev = dev_priv->dev;
u32 reserved = get_reserved(gpio);
REG_WRITE(gpio->reg, reserved | GPIO_CLOCK_DIR_MASK);
REG_WRITE(gpio->reg, reserved);
return (REG_READ(gpio->reg) & GPIO_CLOCK_VAL_IN) != 0;
GMBUS_REG_WRITE(gpio->reg, reserved | GPIO_CLOCK_DIR_MASK);
GMBUS_REG_WRITE(gpio->reg, reserved);
return (GMBUS_REG_READ(gpio->reg) & GPIO_CLOCK_VAL_IN) != 0;
}
static int get_data(void *data)
{
struct intel_gpio *gpio = data;
struct drm_psb_private *dev_priv = gpio->dev_priv;
struct drm_device *dev = dev_priv->dev;
u32 reserved = get_reserved(gpio);
REG_WRITE(gpio->reg, reserved | GPIO_DATA_DIR_MASK);
REG_WRITE(gpio->reg, reserved);
return (REG_READ(gpio->reg) & GPIO_DATA_VAL_IN) != 0;
GMBUS_REG_WRITE(gpio->reg, reserved | GPIO_DATA_DIR_MASK);
GMBUS_REG_WRITE(gpio->reg, reserved);
return (GMBUS_REG_READ(gpio->reg) & GPIO_DATA_VAL_IN) != 0;
}
static void set_clock(void *data, int state_high)
{
struct intel_gpio *gpio = data;
struct drm_psb_private *dev_priv = gpio->dev_priv;
struct drm_device *dev = dev_priv->dev;
u32 reserved = get_reserved(gpio);
u32 clock_bits;
@ -145,15 +145,14 @@ static void set_clock(void *data, int state_high)
clock_bits = GPIO_CLOCK_DIR_OUT | GPIO_CLOCK_DIR_MASK |
GPIO_CLOCK_VAL_MASK;
REG_WRITE(gpio->reg, reserved | clock_bits);
REG_READ(gpio->reg); /* Posting */
GMBUS_REG_WRITE(gpio->reg, reserved | clock_bits);
GMBUS_REG_READ(gpio->reg); /* Posting */
}
static void set_data(void *data, int state_high)
{
struct intel_gpio *gpio = data;
struct drm_psb_private *dev_priv = gpio->dev_priv;
struct drm_device *dev = dev_priv->dev;
u32 reserved = get_reserved(gpio);
u32 data_bits;
@ -163,8 +162,8 @@ static void set_data(void *data, int state_high)
data_bits = GPIO_DATA_DIR_OUT | GPIO_DATA_DIR_MASK |
GPIO_DATA_VAL_MASK;
REG_WRITE(gpio->reg, reserved | data_bits);
REG_READ(gpio->reg);
GMBUS_REG_WRITE(gpio->reg, reserved | data_bits);
GMBUS_REG_READ(gpio->reg);
}
static struct i2c_adapter *
@ -251,7 +250,6 @@ gmbus_xfer(struct i2c_adapter *adapter,
struct intel_gmbus,
adapter);
struct drm_psb_private *dev_priv = adapter->algo_data;
struct drm_device *dev = dev_priv->dev;
int i, reg_offset;
if (bus->force_bit)
@ -260,28 +258,30 @@ gmbus_xfer(struct i2c_adapter *adapter,
reg_offset = 0;
REG_WRITE(GMBUS0 + reg_offset, bus->reg0);
GMBUS_REG_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) {
REG_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);
REG_READ(GMBUS2+reg_offset);
GMBUS_REG_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);
GMBUS_REG_READ(GMBUS2+reg_offset);
do {
u32 val, loop = 0;
if (wait_for(REG_READ(GMBUS2 + reg_offset) & (GMBUS_SATOER | GMBUS_HW_RDY), 50))
if (wait_for(GMBUS_REG_READ(GMBUS2 + reg_offset) &
(GMBUS_SATOER | GMBUS_HW_RDY), 50))
goto timeout;
if (REG_READ(GMBUS2 + reg_offset) & GMBUS_SATOER)
if (GMBUS_REG_READ(GMBUS2 + reg_offset) & GMBUS_SATOER)
goto clear_err;
val = REG_READ(GMBUS3 + reg_offset);
val = GMBUS_REG_READ(GMBUS3 + reg_offset);
do {
*buf++ = val & 0xff;
val >>= 8;
@ -295,18 +295,20 @@ gmbus_xfer(struct i2c_adapter *adapter,
val |= *buf++ << (8 * loop);
} while (--len && ++loop < 4);
REG_WRITE(GMBUS3 + reg_offset, val);
REG_WRITE(GMBUS1 + reg_offset,
GMBUS_REG_WRITE(GMBUS3 + reg_offset, val);
GMBUS_REG_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);
REG_READ(GMBUS2+reg_offset);
GMBUS_REG_READ(GMBUS2+reg_offset);
while (len) {
if (wait_for(REG_READ(GMBUS2 + reg_offset) & (GMBUS_SATOER | GMBUS_HW_RDY), 50))
if (wait_for(GMBUS_REG_READ(GMBUS2 + reg_offset) &
(GMBUS_SATOER | GMBUS_HW_RDY), 50))
goto timeout;
if (REG_READ(GMBUS2 + reg_offset) & GMBUS_SATOER)
if (GMBUS_REG_READ(GMBUS2 + reg_offset) &
GMBUS_SATOER)
goto clear_err;
val = loop = 0;
@ -314,14 +316,14 @@ gmbus_xfer(struct i2c_adapter *adapter,
val |= *buf++ << (8 * loop);
} while (--len && ++loop < 4);
REG_WRITE(GMBUS3 + reg_offset, val);
REG_READ(GMBUS2+reg_offset);
GMBUS_REG_WRITE(GMBUS3 + reg_offset, val);
GMBUS_REG_READ(GMBUS2+reg_offset);
}
}
if (i + 1 < num && wait_for(REG_READ(GMBUS2 + reg_offset) & (GMBUS_SATOER | GMBUS_HW_WAIT_PHASE), 50))
if (i + 1 < num && wait_for(GMBUS_REG_READ(GMBUS2 + reg_offset) & (GMBUS_SATOER | GMBUS_HW_WAIT_PHASE), 50))
goto timeout;
if (REG_READ(GMBUS2 + reg_offset) & GMBUS_SATOER)
if (GMBUS_REG_READ(GMBUS2 + reg_offset) & GMBUS_SATOER)
goto clear_err;
}
@ -332,20 +334,20 @@ clear_err:
* of resetting the GMBUS controller and so clearing the
* BUS_ERROR raised by the slave's NAK.
*/
REG_WRITE(GMBUS1 + reg_offset, GMBUS_SW_CLR_INT);
REG_WRITE(GMBUS1 + reg_offset, 0);
GMBUS_REG_WRITE(GMBUS1 + reg_offset, GMBUS_SW_CLR_INT);
GMBUS_REG_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.
*/
REG_WRITE(GMBUS0 + reg_offset, 0);
GMBUS_REG_WRITE(GMBUS0 + reg_offset, 0);
return i;
timeout:
DRM_INFO("GMBUS timed out, falling back to bit banging on pin %d [%s]\n",
bus->reg0 & 0xff, bus->adapter.name);
REG_WRITE(GMBUS0 + reg_offset, 0);
GMBUS_REG_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);
@ -399,6 +401,11 @@ int gma_intel_setup_gmbus(struct drm_device *dev)
if (dev_priv->gmbus == NULL)
return -ENOMEM;
if (IS_MRST(dev))
dev_priv->gmbus_reg = dev_priv->aux_reg;
else
dev_priv->gmbus_reg = dev_priv->vdc_reg;
for (i = 0; i < GMBUS_NUM_PORTS; i++) {
struct intel_gmbus *bus = &dev_priv->gmbus[i];
@ -487,6 +494,7 @@ void gma_intel_teardown_gmbus(struct drm_device *dev)
i2c_del_adapter(&bus->adapter);
}
dev_priv->gmbus_reg = NULL; /* iounmap is done in driver_unload */
kfree(dev_priv->gmbus);
dev_priv->gmbus = NULL;
}