Add the platform driver for i915 on-die spi device, exposed via mfd
framework.
Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Cc: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
Signed-off-by: Tomas Winkler <tomas.winkler@xxxxxxxxx>
---
drivers/gpu/drm/i915/Kconfig | 2 +
drivers/gpu/drm/i915/Makefile | 3 +
drivers/gpu/drm/i915/spi/intel_spi_drv.c | 116 +++++++++++++++++++++++
3 files changed, 121 insertions(+)
create mode 100644 drivers/gpu/drm/i915/spi/intel_spi_drv.c
diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
index abcaa8da45ac..13c870e5878e 100644
--- a/drivers/gpu/drm/i915/Kconfig
+++ b/drivers/gpu/drm/i915/Kconfig
@@ -27,6 +27,8 @@ config DRM_I915
select CEC_CORE if CEC_NOTIFIER
select VMAP_PFN
select MFD_CORE
+ select MTD
+ select MTD_PARTITIONED_MASTER
help
Choose this option if you have a system that has "Intel Graphics
Media Accelerator" or "HD Graphics" integrated graphics,
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 7fa9120feb8d..f209cd541eec 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -299,6 +299,9 @@ endif
obj-$(CONFIG_DRM_I915) += i915.o
obj-$(CONFIG_DRM_I915_GVT_KVMGT) += gvt/kvmgt.o
+obj-m += i915_spi.o
+i915_spi-y := spi/intel_spi_drv.o
+
# header test
# exclude some broken headers from the test coverage
diff --git a/drivers/gpu/drm/i915/spi/intel_spi_drv.c b/drivers/gpu/drm/i915/spi/intel_spi_drv.c
new file mode 100644
index 000000000000..23261f35b71f
--- /dev/null
+++ b/drivers/gpu/drm/i915/spi/intel_spi_drv.c
@@ -0,0 +1,116 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright(c) 2019-2021, Intel Corporation. All rights reserved.
+ */
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/io.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <spi/intel_spi.h>
+
+struct i915_spi {
+ void __iomem *base;
+ size_t size;
+ unsigned int nregions;
+ struct {
+ const char *name;
+ u8 id;
+ u64 offset;
+ u64 size;
+ } regions[];
+};
+
+static int i915_spi_probe(struct platform_device *platdev)
+{
+ struct resource *bar;
+ struct device *device;
+ struct i915_spi *spi;
+ struct i915_spi_region *regions;
+ unsigned int nregions;
+ unsigned int i, n;
+ size_t size;
+ char *name;
+ size_t name_size;
+
+ device = &platdev->dev;
+
+ regions = dev_get_platdata(&platdev->dev);
+ if (!regions) {
+ dev_err(device, "no regions defined\n");
+ return -ENODEV;
+ }
+
+ /* count available regions */
+ for (nregions = 0, i = 0; i < I915_SPI_REGIONS; i++) {
+ if (regions[i].name)
+ nregions++;
+ }
+
+ if (!nregions) {
+ dev_err(device, "no regions defined\n");
+ return -ENODEV;
+ }
+
+ size = sizeof(*spi) + sizeof(spi->regions[0]) * nregions;
+ spi = devm_kzalloc(device, size, GFP_KERNEL);
+ if (!spi)
+ return -ENOMEM;
+
+ spi->nregions = nregions;
+ for (n = 0, i = 0; i < I915_SPI_REGIONS; i++) {
+ if (regions[i].name) {
+ name_size = strlen(dev_name(&platdev->dev)) +
+ strlen(regions[i].name) + 2; /* for point */
+ name = devm_kzalloc(device, name_size, GFP_KERNEL);
+ if (!name)
+ continue;
+ snprintf(name, name_size, "%s.%s",
+ dev_name(&platdev->dev), regions[i].name);
+ spi->regions[n].name = name;
+ spi->regions[n].id = i;
+ n++;
+ }
+ }
+
+ bar = platform_get_resource(platdev, IORESOURCE_MEM, 0);
+ if (!bar)
+ return -ENODEV;
+
+ spi->base = devm_ioremap_resource(device, bar);
+ if (IS_ERR(spi->base)) {
+ dev_err(device, "mmio not mapped\n");
+ return PTR_ERR(spi->base);
+ }
+
+ platform_set_drvdata(platdev, spi);
+
+ dev_dbg(device, "i915-spi is bound\n");
+
+ return 0;
+}
+
+static int i915_spi_remove(struct platform_device *platdev)
+{
+ platform_set_drvdata(platdev, NULL);
+
+ return 0;
+}
+
+MODULE_ALIAS("platform:i915-spi");
+static struct platform_driver i915_spi_driver = {
+ .probe = i915_spi_probe,
+ .remove = i915_spi_remove,
+ .driver = {
+ .name = "i915-spi",
+ },
+};
+
+module_platform_driver(i915_spi_driver);
+
+MODULE_LICENSE("GPL and additional rights");
+MODULE_AUTHOR("Intel Corporation");
+MODULE_DESCRIPTION("Intel DGFX SPI driver");
--
2.26.2
_______________________________________________
Intel-gfx mailing list
Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
