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>
221 /* When using bit bashing for I2C, this bit needs to be set to 1 */ in pnv_gmbus_clock_gating()
242 struct drm_i915_private *i915 = bus->i915; in get_reserved()
247 reserved = intel_de_read_notrace(i915, bus->gpio_reg) & in get_reserved()
256 struct drm_i915_private *i915 = bus->i915; in get_clock()
259 intel_de_write_notrace(i915, bus->gpio_reg, reserved | GPIO_CLOCK_DIR_MASK); in get_clock()
260 intel_de_write_notrace(i915, bus->gpio_reg, reserved); in get_clock()
262 return (intel_de_read_notrace(i915, bus->gpio_reg) & GPIO_CLOCK_VAL_IN) != 0; in get_clock()
268 struct drm_i915_private *i915 = bus->i915; in get_data()
271 intel_de_write_notrace(i915, bus->gpio_reg, reserved | GPIO_DATA_DIR_MASK); in get_data()
272 intel_de_write_notrace(i915, bus->gpio_reg, reserved); in get_data()
274 return (intel_de_read_notrace(i915, bus->gpio_reg) & GPIO_DATA_VAL_IN) != 0; in get_data()
280 struct drm_i915_private *i915 = bus->i915; in set_clock()
290 intel_de_write_notrace(i915, bus->gpio_reg, reserved | clock_bits); in set_clock()
291 intel_de_posting_read(i915, bus->gpio_reg); in set_clock()
297 struct drm_i915_private *i915 = bus->i915; in set_data()
307 intel_de_write_notrace(i915, bus->gpio_reg, reserved | data_bits); in set_data()
308 intel_de_posting_read(i915, bus->gpio_reg); in set_data()
315 struct drm_i915_private *i915 = bus->i915; in intel_gpio_pre_xfer()
332 struct drm_i915_private *i915 = bus->i915; in intel_gpio_post_xfer()
346 algo = &bus->bit_algo; in intel_gpio_setup()
348 bus->gpio_reg = gpio_reg; in intel_gpio_setup()
349 bus->adapter.algo_data = algo; in intel_gpio_setup()
350 algo->setsda = set_data; in intel_gpio_setup()
351 algo->setscl = set_clock; in intel_gpio_setup()
352 algo->getsda = get_data; in intel_gpio_setup()
353 algo->getscl = get_clock; in intel_gpio_setup()
354 algo->pre_xfer = intel_gpio_pre_xfer; in intel_gpio_setup()
355 algo->post_xfer = intel_gpio_post_xfer; in intel_gpio_setup()
356 algo->udelay = I2C_RISEFALL_TIME; in intel_gpio_setup()
357 algo->timeout = usecs_to_jiffies(2200); in intel_gpio_setup()
358 algo->data = bus; in intel_gpio_setup()
364 * encoder->shutdown() may want to use GMBUS in has_gmbus_irq()
376 /* Important: The hw handles only the first bit, so set only one! Since in gmbus_wait()
383 add_wait_queue(&i915->display.gmbus.wait_queue, &wait); in gmbus_wait()
394 remove_wait_queue(&i915->display.gmbus.wait_queue, &wait); in gmbus_wait()
397 return -ENXIO; in gmbus_wait()
409 /* Important: The hw handles only the first bit, so set only one! */ in gmbus_wait_idle()
414 add_wait_queue(&i915->display.gmbus.wait_queue, &wait); in gmbus_wait_idle()
420 remove_wait_queue(&i915->display.gmbus.wait_queue, &wait); in gmbus_wait_idle()
471 } while (--len && ++loop < 4); in gmbus_xfer_read_chunk()
473 if (burst_read && len == size - 4) in gmbus_xfer_read_chunk()
474 /* Reset the override bit */ in gmbus_xfer_read_chunk()
495 u8 *buf = msg->buf; in gmbus_xfer_read()
496 unsigned int rx_size = msg->len; in gmbus_xfer_read()
506 ret = gmbus_xfer_read_chunk(i915, msg->addr, buf, len, in gmbus_xfer_read()
511 rx_size -= len; in gmbus_xfer_read()
529 len -= 1; in gmbus_xfer_write_chunk()
541 } while (--len && ++loop < 4); in gmbus_xfer_write_chunk()
557 u8 *buf = msg->buf; in gmbus_xfer_write()
558 unsigned int tx_size = msg->len; in gmbus_xfer_write()
565 ret = gmbus_xfer_write_chunk(i915, msg->addr, buf, len, in gmbus_xfer_write()
571 tx_size -= len; in gmbus_xfer_write()
606 /* GMBUS5 holds 16-bit index */ in gmbus_index_xfer()
628 struct drm_i915_private *i915 = bus->i915; in do_gmbus_xfer()
639 intel_de_write_fw(i915, GMBUS0(i915), gmbus0_source | bus->reg0); in do_gmbus_xfer()
645 gmbus0_source | bus->reg0); in do_gmbus_xfer()
649 gmbus0_source | bus->reg0, 0); in do_gmbus_xfer()
657 if (ret == -ETIMEDOUT) in do_gmbus_xfer()
670 * We will re-enable it at the start of the next xfer, in do_gmbus_xfer()
674 drm_dbg_kms(&i915->drm, in do_gmbus_xfer()
676 adapter->name); in do_gmbus_xfer()
677 ret = -ETIMEDOUT; in do_gmbus_xfer()
690 * adapter must report -ENXIO. It is not clear what to return if no ACK in do_gmbus_xfer()
692 * spurious -ENXIO because that will prevent i2c and drm edid functions in do_gmbus_xfer()
693 * from retrying. So return -ENXIO only when gmbus properly quiescents - in do_gmbus_xfer()
697 ret = -ENXIO; in do_gmbus_xfer()
699 drm_dbg_kms(&i915->drm, in do_gmbus_xfer()
701 adapter->name); in do_gmbus_xfer()
702 ret = -ETIMEDOUT; in do_gmbus_xfer()
705 /* Toggle the Software Clear Interrupt bit. This has the effect in do_gmbus_xfer()
713 drm_dbg_kms(&i915->drm, "GMBUS [%s] NAK for addr: %04x %c(%d)\n", in do_gmbus_xfer()
714 adapter->name, msgs[i].addr, in do_gmbus_xfer()
719 * message once on -ENXIO for GMBUS transfers; the bit banging algorithm in do_gmbus_xfer()
721 * drm_do_probe_ddc_edid, which bails out on the first -ENXIO. in do_gmbus_xfer()
723 if (ret == -ENXIO && i == 0 && try++ == 0) { in do_gmbus_xfer()
724 drm_dbg_kms(&i915->drm, in do_gmbus_xfer()
726 adapter->name); in do_gmbus_xfer()
733 drm_dbg_kms(&i915->drm, in do_gmbus_xfer()
734 "GMBUS [%s] timed out, falling back to bit banging on pin %d\n", in do_gmbus_xfer()
735 bus->adapter.name, bus->reg0 & 0xff); in do_gmbus_xfer()
742 ret = -EAGAIN; in do_gmbus_xfer()
758 struct drm_i915_private *i915 = bus->i915; in gmbus_xfer()
764 if (bus->force_bit) { in gmbus_xfer()
767 bus->force_bit &= ~GMBUS_FORCE_BIT_RETRY; in gmbus_xfer()
770 if (ret == -EAGAIN) in gmbus_xfer()
771 bus->force_bit |= GMBUS_FORCE_BIT_RETRY; in gmbus_xfer()
782 struct drm_i915_private *i915 = bus->i915; in intel_gmbus_output_aksv()
803 mutex_lock(&i915->display.gmbus.mutex); in intel_gmbus_output_aksv()
807 * pass the i2c command, and tell GMBUS to use the HW-provided value in intel_gmbus_output_aksv()
812 mutex_unlock(&i915->display.gmbus.mutex); in intel_gmbus_output_aksv()
836 struct drm_i915_private *i915 = bus->i915; in gmbus_lock_bus()
838 mutex_lock(&i915->display.gmbus.mutex); in gmbus_lock_bus()
845 struct drm_i915_private *i915 = bus->i915; in gmbus_trylock_bus()
847 return mutex_trylock(&i915->display.gmbus.mutex); in gmbus_trylock_bus()
854 struct drm_i915_private *i915 = bus->i915; in gmbus_unlock_bus()
856 mutex_unlock(&i915->display.gmbus.mutex); in gmbus_unlock_bus()
866 * intel_gmbus_setup - instantiate all Intel i2c GMBuses
871 struct pci_dev *pdev = to_pci_dev(i915->drm.dev); in intel_gmbus_setup()
876 i915->display.gmbus.mmio_base = VLV_DISPLAY_BASE; in intel_gmbus_setup()
882 i915->display.gmbus.mmio_base = PCH_DISPLAY_BASE; in intel_gmbus_setup()
884 mutex_init(&i915->display.gmbus.mutex); in intel_gmbus_setup()
885 init_waitqueue_head(&i915->display.gmbus.wait_queue); in intel_gmbus_setup()
887 for (pin = 0; pin < ARRAY_SIZE(i915->display.gmbus.bus); pin++) { in intel_gmbus_setup()
897 ret = -ENOMEM; in intel_gmbus_setup()
901 bus->adapter.owner = THIS_MODULE; in intel_gmbus_setup()
902 snprintf(bus->adapter.name, in intel_gmbus_setup()
903 sizeof(bus->adapter.name), in intel_gmbus_setup()
904 "i915 gmbus %s", gmbus_pin->name); in intel_gmbus_setup()
906 bus->adapter.dev.parent = &pdev->dev; in intel_gmbus_setup()
907 bus->i915 = i915; in intel_gmbus_setup()
909 bus->adapter.algo = &gmbus_algorithm; in intel_gmbus_setup()
910 bus->adapter.lock_ops = &gmbus_lock_ops; in intel_gmbus_setup()
913 * We wish to retry with bit banging in intel_gmbus_setup()
916 bus->adapter.retries = 1; in intel_gmbus_setup()
919 bus->reg0 = pin | GMBUS_RATE_100KHZ; in intel_gmbus_setup()
923 bus->force_bit = 1; in intel_gmbus_setup()
925 intel_gpio_setup(bus, GPIO(i915, gmbus_pin->gpio)); in intel_gmbus_setup()
927 ret = i2c_add_adapter(&bus->adapter); in intel_gmbus_setup()
933 i915->display.gmbus.bus[pin] = bus; in intel_gmbus_setup()
949 if (drm_WARN_ON(&i915->drm, pin >= ARRAY_SIZE(i915->display.gmbus.bus) || in intel_gmbus_get_adapter()
950 !i915->display.gmbus.bus[pin])) in intel_gmbus_get_adapter()
953 return &i915->display.gmbus.bus[pin]->adapter; in intel_gmbus_get_adapter()
959 struct drm_i915_private *i915 = bus->i915; in intel_gmbus_force_bit()
961 mutex_lock(&i915->display.gmbus.mutex); in intel_gmbus_force_bit()
963 bus->force_bit += force_bit ? 1 : -1; in intel_gmbus_force_bit()
964 drm_dbg_kms(&i915->drm, in intel_gmbus_force_bit()
965 "%sabling bit-banging on %s. force bit now %d\n", in intel_gmbus_force_bit()
966 force_bit ? "en" : "dis", adapter->name, in intel_gmbus_force_bit()
967 bus->force_bit); in intel_gmbus_force_bit()
969 mutex_unlock(&i915->display.gmbus.mutex); in intel_gmbus_force_bit()
976 return bus->force_bit; in intel_gmbus_is_forced_bit()
983 for (pin = 0; pin < ARRAY_SIZE(i915->display.gmbus.bus); pin++) { in intel_gmbus_teardown()
986 bus = i915->display.gmbus.bus[pin]; in intel_gmbus_teardown()
990 i2c_del_adapter(&bus->adapter); in intel_gmbus_teardown()
993 i915->display.gmbus.bus[pin] = NULL; in intel_gmbus_teardown()
999 wake_up_all(&i915->display.gmbus.wait_queue); in intel_gmbus_irq_handler()