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path: root/drivers/mfd/intel-m10-bmc.c
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Diffstat (limited to 'drivers/mfd/intel-m10-bmc.c')
-rw-r--r--drivers/mfd/intel-m10-bmc.c164
1 files changed, 164 insertions, 0 deletions
diff --git a/drivers/mfd/intel-m10-bmc.c b/drivers/mfd/intel-m10-bmc.c
new file mode 100644
index 000000000000..b84579b7b4f0
--- /dev/null
+++ b/drivers/mfd/intel-m10-bmc.c
@@ -0,0 +1,164 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Intel MAX 10 Board Management Controller chip
+ *
+ * Copyright (C) 2018-2020 Intel Corporation. All rights reserved.
+ */
+#include <linux/bitfield.h>
+#include <linux/init.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/intel-m10-bmc.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+
+enum m10bmc_type {
+ M10_N3000,
+};
+
+static struct mfd_cell m10bmc_pacn3000_subdevs[] = {
+ { .name = "n3000bmc-hwmon" },
+ { .name = "n3000bmc-retimer" },
+ { .name = "n3000bmc-secure" },
+};
+
+static struct regmap_config intel_m10bmc_regmap_config = {
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_stride = 4,
+ .max_register = M10BMC_MEM_END,
+};
+
+static ssize_t bmc_version_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct intel_m10bmc *ddata = dev_get_drvdata(dev);
+ unsigned int val;
+ int ret;
+
+ ret = m10bmc_sys_read(ddata, M10BMC_BUILD_VER, &val);
+ if (ret)
+ return ret;
+
+ return sprintf(buf, "0x%x\n", val);
+}
+static DEVICE_ATTR_RO(bmc_version);
+
+static ssize_t bmcfw_version_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct intel_m10bmc *ddata = dev_get_drvdata(dev);
+ unsigned int val;
+ int ret;
+
+ ret = m10bmc_sys_read(ddata, NIOS2_FW_VERSION, &val);
+ if (ret)
+ return ret;
+
+ return sprintf(buf, "0x%x\n", val);
+}
+static DEVICE_ATTR_RO(bmcfw_version);
+
+static struct attribute *m10bmc_attrs[] = {
+ &dev_attr_bmc_version.attr,
+ &dev_attr_bmcfw_version.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(m10bmc);
+
+static int check_m10bmc_version(struct intel_m10bmc *ddata)
+{
+ unsigned int v;
+ int ret;
+
+ /*
+ * This check is to filter out the very old legacy BMC versions,
+ * M10BMC_LEGACY_SYS_BASE is the offset to this old block of mmio
+ * registers. In the old BMC chips, the BMC version info is stored
+ * in this old version register (M10BMC_LEGACY_SYS_BASE +
+ * M10BMC_BUILD_VER), so its read out value would have not been
+ * LEGACY_INVALID (0xffffffff). But in new BMC chips that the
+ * driver supports, the value of this register should be
+ * LEGACY_INVALID.
+ */
+ ret = m10bmc_raw_read(ddata,
+ M10BMC_LEGACY_SYS_BASE + M10BMC_BUILD_VER, &v);
+ if (ret)
+ return -ENODEV;
+
+ if (v != M10BMC_VER_LEGACY_INVALID) {
+ dev_err(ddata->dev, "bad version M10BMC detected\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static int intel_m10_bmc_spi_probe(struct spi_device *spi)
+{
+ const struct spi_device_id *id = spi_get_device_id(spi);
+ struct device *dev = &spi->dev;
+ struct mfd_cell *cells;
+ struct intel_m10bmc *ddata;
+ int ret, n_cell;
+
+ ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
+ if (!ddata)
+ return -ENOMEM;
+
+ ddata->dev = dev;
+
+ ddata->regmap =
+ devm_regmap_init_spi_avmm(spi, &intel_m10bmc_regmap_config);
+ if (IS_ERR(ddata->regmap)) {
+ ret = PTR_ERR(ddata->regmap);
+ dev_err(dev, "Failed to allocate regmap: %d\n", ret);
+ return ret;
+ }
+
+ spi_set_drvdata(spi, ddata);
+
+ ret = check_m10bmc_version(ddata);
+ if (ret) {
+ dev_err(dev, "Failed to identify m10bmc hardware\n");
+ return ret;
+ }
+
+ switch (id->driver_data) {
+ case M10_N3000:
+ cells = m10bmc_pacn3000_subdevs;
+ n_cell = ARRAY_SIZE(m10bmc_pacn3000_subdevs);
+ break;
+ default:
+ return -ENODEV;
+ }
+
+ ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO, cells, n_cell,
+ NULL, 0, NULL);
+ if (ret)
+ dev_err(dev, "Failed to register sub-devices: %d\n", ret);
+
+ return ret;
+}
+
+static const struct spi_device_id m10bmc_spi_id[] = {
+ { "m10-n3000", M10_N3000 },
+ { }
+};
+MODULE_DEVICE_TABLE(spi, m10bmc_spi_id);
+
+static struct spi_driver intel_m10bmc_spi_driver = {
+ .driver = {
+ .name = "intel-m10-bmc",
+ .dev_groups = m10bmc_groups,
+ },
+ .probe = intel_m10_bmc_spi_probe,
+ .id_table = m10bmc_spi_id,
+};
+module_spi_driver(intel_m10bmc_spi_driver);
+
+MODULE_DESCRIPTION("Intel MAX 10 BMC Device Driver");
+MODULE_AUTHOR("Intel Corporation");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("spi:intel-m10-bmc");