On Tue, 16 Feb 2021, Tomas Winkler <tomas.wink...@intel.com> wrote:
> Add the platform driver for i915 on-die spi device, exposed via mfd
> framework.
>
> Cc: Rodrigo Vivi <rodrigo.v...@intel.com>
> Cc: Lucas De Marchi <lucas.demar...@intel.com>
> Signed-off-by: Tomas Winkler <tomas.wink...@intel.com>
> ---
> 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
Selecting MTD does not seem to be a popular thing to do, which is
usually a clue it's probably the wrong thing to do.
> + 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
And literally nobody does this.
> +i915_spi-y := spi/intel_spi_drv.o
Time to add a separate Kconfig and Makefile in spi/?
BR,
Jani.
> +
> # 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>
Should this have "" instead of <>?
> +
> +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");
--
Jani Nikula, Intel Open Source Graphics Center
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