[PATCH v3 08/12] drm/i915/spi: add spi device for discrete graphics
Alexander Usyskin
alexander.usyskin at intel.com
Thu Jul 25 13:56:53 UTC 2024
From: Tomas Winkler <tomas.winkler at intel.com>
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 at intel.com>
CC: Lucas De Marchi <lucas.demarchi at intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler at intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin at intel.com>
---
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 | 64 ++++++++++++++++++++++++++++
drivers/gpu/drm/i915/spi/intel_spi.h | 15 +++++++
6 files changed, 94 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 161b21eff694..49916a586dac 100644
--- a/drivers/gpu/drm/i915/i915_driver.c
+++ b/drivers/gpu/drm/i915/i915_driver.c
@@ -81,6 +81,8 @@
#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"
@@ -619,6 +621,8 @@ 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);
@@ -662,6 +666,8 @@ 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 d1d21d433766..dd48fae4efe0 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 8e4478194d11..50dc19c58666 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..17e4c7861ef5
--- /dev/null
+++ b/drivers/gpu/drm/i915/spi/intel_spi.c
@@ -0,0 +1,64 @@
+// 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);
+
+ 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
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