Add the platform driver for i915 on-die spi device, exposed via mfd framework.
Cc: Rodrigo Vivi <[email protected]> Cc: Lucas De Marchi <[email protected]> Signed-off-by: Tomas Winkler <[email protected]> --- 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 [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
