Add auxiliary driver for intel discrete graphics
on-die spi device.
CC: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Signed-off-by: Tomas Winkler <tomas.winkler@xxxxxxxxx>
Signed-off-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
Signed-off-by: Alexander Usyskin <alexander.usyskin@xxxxxxxxx>
---
drivers/spi/Kconfig | 11 +++
drivers/spi/Makefile | 1 +
drivers/spi/spi-intel-dg.c | 146 +++++++++++++++++++++++++++++++++++++
3 files changed, 158 insertions(+)
create mode 100644 drivers/spi/spi-intel-dg.c
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index ddae0fde798e..d84896e6e7a0 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -507,6 +507,17 @@ config SPI_INTEL_PLATFORM
To compile this driver as a module, choose M here: the module
will be called spi-intel-platform.
+config SPI_INTEL_DG
+ tristate "Intel Discrete Graphic SPI flash driver"
+ depends on AUXILIARY_BUS || COMPILE_TEST
+ depends on MTD
+ help
+ This enables support for Intel Discrete Graphic SPI
+ auxiliary device.
+
+ To compile this driver as a module, choose M here: the module
+ will be called spi-intel-dg.
+
config SPI_JCORE
tristate "J-Core SPI Master"
depends on OF && (SUPERH || COMPILE_TEST)
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 4ff8d725ba5e..e158761d6844 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -69,6 +69,7 @@ obj-$(CONFIG_SPI_INGENIC) += spi-ingenic.o
obj-$(CONFIG_SPI_INTEL) += spi-intel.o
obj-$(CONFIG_SPI_INTEL_PCI) += spi-intel-pci.o
obj-$(CONFIG_SPI_INTEL_PLATFORM) += spi-intel-platform.o
+obj-$(CONFIG_SPI_INTEL_DG) += spi-intel-dg.o
obj-$(CONFIG_SPI_LANTIQ_SSC) += spi-lantiq-ssc.o
obj-$(CONFIG_SPI_JCORE) += spi-jcore.o
obj-$(CONFIG_SPI_LJCA) += spi-ljca.o
diff --git a/drivers/spi/spi-intel-dg.c b/drivers/spi/spi-intel-dg.c
new file mode 100644
index 000000000000..8dc5448fc901
--- /dev/null
+++ b/drivers/spi/spi-intel-dg.c
@@ -0,0 +1,146 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright(c) 2019-2024, Intel Corporation. All rights reserved.
+ */
+
+#include <linux/device.h>
+#include <linux/intel_dg_spi_aux.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+struct intel_dg_spi {
+ struct kref refcnt;
+ void __iomem *base;
+ size_t size;
+ unsigned int nregions;
+ struct {
+ const char *name;
+ u8 id;
+ u64 offset;
+ u64 size;
+ } regions[];
+};
+
+static void intel_dg_spi_release(struct kref *kref)
+{
+ struct intel_dg_spi *spi = container_of(kref, struct intel_dg_spi, refcnt);
+ int i;
+
+ pr_debug("freeing spi memory\n");
+ for (i = 0; i < spi->nregions; i++)
+ kfree(spi->regions[i].name);
+ kfree(spi);
+}
+
+static int intel_dg_spi_probe(struct auxiliary_device *aux_dev,
+ const struct auxiliary_device_id *aux_dev_id)
+{
+ struct intel_dg_spi_dev *ispi = auxiliary_dev_to_intel_dg_spi_dev(aux_dev);
+ struct device *device;
+ struct intel_dg_spi *spi;
+ unsigned int nregions;
+ unsigned int i, n;
+ size_t size;
+ char *name;
+ size_t name_size;
+ int ret;
+
+ device = &aux_dev->dev;
+
+ /* count available regions */
+ for (nregions = 0, i = 0; i < INTEL_DG_SPI_REGIONS; i++) {
+ if (ispi->regions[i].name)
+ nregions++;
+ }
+
+ if (!nregions) {
+ dev_err(device, "no regions defined\n");
+ return -ENODEV;
+ }
+
+ size = sizeof(*spi) + sizeof(spi->regions[0]) * nregions;
+ spi = kzalloc(size, GFP_KERNEL);
+ if (!spi)
+ return -ENOMEM;
+
+ kref_init(&spi->refcnt);
+
+ spi->nregions = nregions;
+ for (n = 0, i = 0; i < INTEL_DG_SPI_REGIONS; i++) {
+ if (ispi->regions[i].name) {
+ name_size = strlen(dev_name(&aux_dev->dev)) +
+ strlen(ispi->regions[i].name) + 2; /* for point */
+ name = kzalloc(name_size, GFP_KERNEL);
+ if (!name)
+ continue;
+ snprintf(name, name_size, "%s.%s",
+ dev_name(&aux_dev->dev), ispi->regions[i].name);
+ spi->regions[n].name = name;
+ spi->regions[n].id = i;
+ n++;
+ }
+ }
+
+ spi->base = devm_ioremap_resource(device, &ispi->bar);
+ if (IS_ERR(spi->base)) {
+ dev_err(device, "mmio not mapped\n");
+ ret = PTR_ERR(spi->base);
+ goto err;
+ }
+
+ dev_set_drvdata(&aux_dev->dev, spi);
+
+ dev_dbg(device, "bound\n");
+
+ return 0;
+
+err:
+ kref_put(&spi->refcnt, intel_dg_spi_release);
+ return ret;
+}
+
+static void intel_dg_spi_remove(struct auxiliary_device *aux_dev)
+{
+ struct intel_dg_spi *spi = dev_get_drvdata(&aux_dev->dev);
+
+ if (!spi)
+ return;
+
+ dev_set_drvdata(&aux_dev->dev, NULL);
+
+ kref_put(&spi->refcnt, intel_dg_spi_release);
+}
+
+static const struct auxiliary_device_id intel_dg_spi_id_table[] = {
+ {
+ .name = "i915.spi",
+ },
+ {
+ .name = "xe.spi",
+ },
+ {
+ /* sentinel */
+ }
+};
+MODULE_DEVICE_TABLE(auxiliary, intel_dg_spi_id_table);
+
+static struct auxiliary_driver intel_dg_spi_driver = {
+ .probe = intel_dg_spi_probe,
+ .remove = intel_dg_spi_remove,
+ .driver = {
+ /* auxiliary_driver_register() sets .name to be the modname */
+ },
+ .id_table = intel_dg_spi_id_table
+};
+
+module_auxiliary_driver(intel_dg_spi_driver);
+
+MODULE_ALIAS("auxiliary:i915.spi");
+MODULE_ALIAS("auxiliary:xe.spi");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Intel Corporation");
+MODULE_DESCRIPTION("Intel DGFX SPI driver");
--
2.34.1
