Lines Matching +full:bit +full:- +full:banging
3 * Copyright © 2006-2008,2010 Intel Corporation
27 * Chris Wilson <chris@chris-wilson.co.uk>
31 #include <linux/i2c-algo-bit.h>
44 ret__ = -ETIMEDOUT; \
55 #define GMBUS_REG_READ(reg) ioread32(dev_priv->gmbus_reg + (reg))
56 #define GMBUS_REG_WRITE(reg, val) iowrite32((val), dev_priv->gmbus_reg + (reg))
84 /* When using bit bashing for I2C, this bit needs to be set to 1 */ in intel_i2c_quirk_set()
89 if (!IS_PINEVIEW(dev_priv->dev)) in intel_i2c_quirk_set()
105 struct drm_psb_private *dev_priv = gpio->dev_priv; in get_reserved()
109 reserved = GMBUS_REG_READ(gpio->reg) & in get_reserved()
119 struct drm_psb_private *dev_priv = gpio->dev_priv; in get_clock()
121 GMBUS_REG_WRITE(gpio->reg, reserved | GPIO_CLOCK_DIR_MASK); in get_clock()
122 GMBUS_REG_WRITE(gpio->reg, reserved); in get_clock()
123 return (GMBUS_REG_READ(gpio->reg) & GPIO_CLOCK_VAL_IN) != 0; in get_clock()
129 struct drm_psb_private *dev_priv = gpio->dev_priv; in get_data()
131 GMBUS_REG_WRITE(gpio->reg, reserved | GPIO_DATA_DIR_MASK); in get_data()
132 GMBUS_REG_WRITE(gpio->reg, reserved); in get_data()
133 return (GMBUS_REG_READ(gpio->reg) & GPIO_DATA_VAL_IN) != 0; in get_data()
139 struct drm_psb_private *dev_priv = gpio->dev_priv; in set_clock()
149 GMBUS_REG_WRITE(gpio->reg, reserved | clock_bits); in set_clock()
150 GMBUS_REG_READ(gpio->reg); /* Posting */ in set_clock()
156 struct drm_psb_private *dev_priv = gpio->dev_priv; in set_data()
166 GMBUS_REG_WRITE(gpio->reg, reserved | data_bits); in set_data()
167 GMBUS_REG_READ(gpio->reg); in set_data()
192 gpio->reg = map_pin_to_reg[pin]; in intel_gpio_create()
193 gpio->dev_priv = dev_priv; in intel_gpio_create()
195 snprintf(gpio->adapter.name, sizeof(gpio->adapter.name), in intel_gpio_create()
197 gpio->adapter.owner = THIS_MODULE; in intel_gpio_create()
198 gpio->adapter.algo_data = &gpio->algo; in intel_gpio_create()
199 gpio->adapter.dev.parent = dev_priv->dev.dev; in intel_gpio_create()
200 gpio->algo.setsda = set_data; in intel_gpio_create()
201 gpio->algo.setscl = set_clock; in intel_gpio_create()
202 gpio->algo.getsda = get_data; in intel_gpio_create()
203 gpio->algo.getscl = get_clock; in intel_gpio_create()
204 gpio->algo.udelay = I2C_RISEFALL_TIME; in intel_gpio_create()
205 gpio->algo.timeout = usecs_to_jiffies(2200); in intel_gpio_create()
206 gpio->algo.data = gpio; in intel_gpio_create()
208 if (i2c_bit_add_bus(&gpio->adapter)) in intel_gpio_create()
211 return &gpio->adapter; in intel_gpio_create()
229 gma_intel_i2c_reset(&dev_priv->dev); in intel_i2c_quirk_xfer()
236 ret = adapter->algo->master_xfer(adapter, msgs, num); in intel_i2c_quirk_xfer()
253 struct drm_psb_private *dev_priv = adapter->algo_data; in gmbus_xfer()
256 if (bus->force_bit) in gmbus_xfer()
258 bus->force_bit, msgs, num); in gmbus_xfer()
262 GMBUS_REG_WRITE(GMBUS0 + reg_offset, bus->reg0); in gmbus_xfer()
289 } while (--len && ++loop < 4); in gmbus_xfer()
297 } while (--len && ++loop < 4); in gmbus_xfer()
318 } while (--len && ++loop < 4); in gmbus_xfer()
334 /* Toggle the Software Clear Interrupt bit. This has the effect in gmbus_xfer()
342 /* Mark the GMBUS interface as disabled. We will re-enable it at the in gmbus_xfer()
349 DRM_INFO("GMBUS timed out, falling back to bit banging on pin %d [%s]\n", in gmbus_xfer()
350 bus->reg0 & 0xff, bus->adapter.name); in gmbus_xfer()
354 bus->force_bit = intel_gpio_create(dev_priv, bus->reg0 & 0xff); in gmbus_xfer()
355 if (!bus->force_bit) in gmbus_xfer()
356 return -ENOMEM; in gmbus_xfer()
358 return intel_i2c_quirk_xfer(dev_priv, bus->force_bit, msgs, num); in gmbus_xfer()
367 if (bus->force_bit) in gmbus_func()
368 bus->force_bit->algo->functionality(bus->force_bit); in gmbus_func()
382 * gma_intel_setup_gmbus() - instantiate all Intel i2c GMBuses
400 dev_priv->gmbus = kcalloc(GMBUS_NUM_PORTS, sizeof(struct intel_gmbus), in gma_intel_setup_gmbus()
402 if (dev_priv->gmbus == NULL) in gma_intel_setup_gmbus()
403 return -ENOMEM; in gma_intel_setup_gmbus()
406 dev_priv->gmbus_reg = dev_priv->aux_reg; in gma_intel_setup_gmbus()
408 dev_priv->gmbus_reg = dev_priv->vdc_reg; in gma_intel_setup_gmbus()
411 struct intel_gmbus *bus = &dev_priv->gmbus[i]; in gma_intel_setup_gmbus()
413 bus->adapter.owner = THIS_MODULE; in gma_intel_setup_gmbus()
414 bus->adapter.class = I2C_CLASS_DDC; in gma_intel_setup_gmbus()
415 snprintf(bus->adapter.name, in gma_intel_setup_gmbus()
416 sizeof(bus->adapter.name), in gma_intel_setup_gmbus()
420 bus->adapter.dev.parent = dev->dev; in gma_intel_setup_gmbus()
421 bus->adapter.algo_data = dev_priv; in gma_intel_setup_gmbus()
423 bus->adapter.algo = &gmbus_algorithm; in gma_intel_setup_gmbus()
424 ret = i2c_add_adapter(&bus->adapter); in gma_intel_setup_gmbus()
429 bus->reg0 = i | GMBUS_RATE_100KHZ; in gma_intel_setup_gmbus()
431 /* XXX force bit banging until GMBUS is fully debugged */ in gma_intel_setup_gmbus()
432 bus->force_bit = intel_gpio_create(dev_priv, i); in gma_intel_setup_gmbus()
435 gma_intel_i2c_reset(&dev_priv->dev); in gma_intel_setup_gmbus()
440 while (i--) { in gma_intel_setup_gmbus()
441 struct intel_gmbus *bus = &dev_priv->gmbus[i]; in gma_intel_setup_gmbus()
442 i2c_del_adapter(&bus->adapter); in gma_intel_setup_gmbus()
444 kfree(dev_priv->gmbus); in gma_intel_setup_gmbus()
445 dev_priv->gmbus = NULL; in gma_intel_setup_gmbus()
459 bus->reg0 = (bus->reg0 & ~(0x3 << 8)) | (speed << 8); in gma_intel_gmbus_set_speed()
467 if (bus->force_bit == NULL) { in gma_intel_gmbus_force_bit()
468 struct drm_psb_private *dev_priv = adapter->algo_data; in gma_intel_gmbus_force_bit()
469 bus->force_bit = intel_gpio_create(dev_priv, in gma_intel_gmbus_force_bit()
470 bus->reg0 & 0xff); in gma_intel_gmbus_force_bit()
473 if (bus->force_bit) { in gma_intel_gmbus_force_bit()
474 i2c_del_adapter(bus->force_bit); in gma_intel_gmbus_force_bit()
475 kfree(bus->force_bit); in gma_intel_gmbus_force_bit()
476 bus->force_bit = NULL; in gma_intel_gmbus_force_bit()
486 if (dev_priv->gmbus == NULL) in gma_intel_teardown_gmbus()
490 struct intel_gmbus *bus = &dev_priv->gmbus[i]; in gma_intel_teardown_gmbus()
491 if (bus->force_bit) { in gma_intel_teardown_gmbus()
492 i2c_del_adapter(bus->force_bit); in gma_intel_teardown_gmbus()
493 kfree(bus->force_bit); in gma_intel_teardown_gmbus()
495 i2c_del_adapter(&bus->adapter); in gma_intel_teardown_gmbus()
498 dev_priv->gmbus_reg = NULL; /* iounmap is done in driver_unload */ in gma_intel_teardown_gmbus()
499 kfree(dev_priv->gmbus); in gma_intel_teardown_gmbus()
500 dev_priv->gmbus = NULL; in gma_intel_teardown_gmbus()