From: Tomas Winkler <tomas.winkler@xxxxxxxxx> Enable access to internal spi on DGFX devices via a child device. The spi child device is exposed via auxiliary bus. CC: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx> CC: Lucas De Marchi <lucas.demarchi@xxxxxxxxx> Signed-off-by: Tomas Winkler <tomas.winkler@xxxxxxxxx> Signed-off-by: Alexander Usyskin <alexander.usyskin@xxxxxxxxx> --- drivers/gpu/drm/i915/Makefile | 4 ++ drivers/gpu/drm/i915/i915_driver.c | 6 +++ drivers/gpu/drm/i915/i915_drv.h | 4 ++ drivers/gpu/drm/i915/i915_reg.h | 1 + drivers/gpu/drm/i915/spi/intel_spi.c | 68 ++++++++++++++++++++++++++++ drivers/gpu/drm/i915/spi/intel_spi.h | 15 ++++++ 6 files changed, 98 insertions(+) create mode 100644 drivers/gpu/drm/i915/spi/intel_spi.c create mode 100644 drivers/gpu/drm/i915/spi/intel_spi.h diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile index c63fa2133ccb..02a9faf049a7 100644 --- a/drivers/gpu/drm/i915/Makefile +++ b/drivers/gpu/drm/i915/Makefile @@ -211,6 +211,10 @@ i915-y += \ i915-y += \ gt/intel_gsc.o +# graphics spi device (DGFX) support +i915-y += \ + spi/intel_spi.o + # graphics hardware monitoring (HWMON) support i915-$(CONFIG_HWMON) += \ i915_hwmon.o diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c index fe905d65ddf7..80330571a2f5 100644 --- a/drivers/gpu/drm/i915/i915_driver.c +++ b/drivers/gpu/drm/i915/i915_driver.c @@ -80,6 +80,8 @@ #include "soc/intel_dram.h" #include "soc/intel_gmch.h" +#include "spi/intel_spi.h" + #include "i915_debugfs.h" #include "i915_driver.h" #include "i915_drm_client.h" @@ -620,6 +622,8 @@ static void i915_driver_register(struct drm_i915_private *dev_priv) /* Depends on sysfs having been initialized */ i915_perf_register(dev_priv); + intel_spi_init(dev_priv); + for_each_gt(gt, dev_priv, i) intel_gt_driver_register(gt); @@ -663,6 +667,8 @@ static void i915_driver_unregister(struct drm_i915_private *dev_priv) i915_hwmon_unregister(dev_priv); + intel_spi_fini(dev_priv); + i915_perf_unregister(dev_priv); i915_pmu_unregister(dev_priv); diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 39f6614a0a99..b9d4f9be5355 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -34,6 +34,8 @@ #include <linux/pm_qos.h> +#include <linux/intel_dg_spi_aux.h> + #include <drm/ttm/ttm_device.h> #include "display/intel_display_limits.h" @@ -315,6 +317,8 @@ struct drm_i915_private { struct i915_perf perf; + struct intel_dg_spi_dev spi; + struct i915_hwmon *hwmon; struct intel_gt *gt[I915_MAX_GT]; diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 41f4350a7c6c..af5d0497b95c 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -323,6 +323,7 @@ #define DG2_GSC_HECI2_BASE 0x00374000 #define MTL_GSC_HECI1_BASE 0x00116000 #define MTL_GSC_HECI2_BASE 0x00117000 +#define GEN12_GUNIT_SPI_BASE 0x00102040 #define HECI_H_CSR(base) _MMIO((base) + 0x4) #define HECI_H_CSR_IE REG_BIT(0) diff --git a/drivers/gpu/drm/i915/spi/intel_spi.c b/drivers/gpu/drm/i915/spi/intel_spi.c new file mode 100644 index 000000000000..4b90e42b0f86 --- /dev/null +++ b/drivers/gpu/drm/i915/spi/intel_spi.c @@ -0,0 +1,68 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright(c) 2019-2024, Intel Corporation. All rights reserved. + */ + +#include <linux/intel_dg_spi_aux.h> +#include <linux/irq.h> +#include "i915_reg.h" +#include "i915_drv.h" +#include "spi/intel_spi.h" + +#define GEN12_GUNIT_SPI_SIZE 0x80 + +static void i915_spi_release_dev(struct device *dev) +{ +} + +void intel_spi_init(struct drm_i915_private *dev_priv) +{ + struct intel_dg_spi_dev *spi = &dev_priv->spi; + struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev); + struct auxiliary_device *aux_dev = &spi->aux_dev; + int ret; + + /* Only the DGFX devices have internal SPI */ + if (!IS_DGFX(dev_priv)) + return; + + spi->bar.parent = &pdev->resource[0]; + spi->bar.start = GEN12_GUNIT_SPI_BASE + pdev->resource[0].start; + spi->bar.end = spi->bar.start + GEN12_GUNIT_SPI_SIZE - 1; + spi->bar.flags = IORESOURCE_MEM; + spi->bar.desc = IORES_DESC_NONE; + + aux_dev->name = "spi"; + aux_dev->id = (pci_domain_nr(pdev->bus) << 16) | + PCI_DEVID(pdev->bus->number, pdev->devfn); + aux_dev->dev.parent = &pdev->dev; + aux_dev->dev.release = i915_spi_release_dev; + + ret = auxiliary_device_init(aux_dev); + if (ret) { + dev_err(&pdev->dev, "i915-spi aux init failed %d\n", ret); + return; + } + + ret = auxiliary_device_add(aux_dev); + if (ret) { + dev_err(&pdev->dev, "i915-spi aux add failed %d\n", ret); + auxiliary_device_uninit(aux_dev); + return; + } +} + +void intel_spi_fini(struct drm_i915_private *dev_priv) +{ + struct intel_dg_spi_dev *spi = &dev_priv->spi; + struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev); + + /* Only the DGFX devices have internal SPI */ + if (!IS_DGFX(dev_priv)) + return; + + dev_dbg(&pdev->dev, "removing i915-spi cell\n"); + + auxiliary_device_delete(&spi->aux_dev); + auxiliary_device_uninit(&spi->aux_dev); +} diff --git a/drivers/gpu/drm/i915/spi/intel_spi.h b/drivers/gpu/drm/i915/spi/intel_spi.h new file mode 100644 index 000000000000..ed4153401f5d --- /dev/null +++ b/drivers/gpu/drm/i915/spi/intel_spi.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: MIT */ +/* + * Copyright(c) 2019-2024 Intel Corporation. All rights reserved. + */ + +#ifndef __INTEL_SPI_H__ +#define __INTEL_SPI_H__ + +struct drm_i915_private; + +void intel_spi_init(struct drm_i915_private *i915); + +void intel_spi_fini(struct drm_i915_private *i915); + +#endif /* __INTEL_SPI_H__ */ -- 2.34.1