mfd: intel-m10-bmc: Split into core and spi specific parts

Split the common code from intel-m10-bmc driver into intel-m10-bmc-core
and move the SPI bus parts into an interface specific file.

intel-m10-bmc-core becomes the core MFD functions which can support
multiple bus interface like SPI bus.

Co-developed-by: Tianfei zhang <tianfei.zhang@intel.com>
Signed-off-by: Tianfei zhang <tianfei.zhang@intel.com>
Reviewed-by: Russ Weight <russell.h.weight@intel.com>
Acked-by: Guenter Roeck <linux@roeck-us.net> # hwmon
Reviewed-by: Xu Yilun <yilun.xu@intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20230116100845.6153-5-ilpo.jarvinen@linux.intel.com

1 files changed, 122 insertions, 0 deletions

diff --git a/drivers/mfd/intel-m10-bmc-core.c b/drivers/mfd/intel-m10-bmc-core.c
new file mode 100644
index 000000000000..dd26e3a6c3ab
--- /dev/null
+++ b/drivers/mfd/intel-m10-bmc-core.c
@@ -0,0 +1,122 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Intel MAX 10 Board Management Controller chip - common code
+ *
+ * Copyright (C) 2018-2020 Intel Corporation. All rights reserved.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/device.h>
+#include <linux/dev_printk.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/intel-m10-bmc.h>
+#include <linux/module.h>
+
+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 ssize_t mac_address_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct intel_m10bmc *ddata = dev_get_drvdata(dev);
+	unsigned int macaddr_low, macaddr_high;
+	int ret;
+
+	ret = m10bmc_sys_read(ddata, M10BMC_MAC_LOW, &macaddr_low);
+	if (ret)
+		return ret;
+
+	ret = m10bmc_sys_read(ddata, M10BMC_MAC_HIGH, &macaddr_high);
+	if (ret)
+		return ret;
+
+	return sysfs_emit(buf, "%02x:%02x:%02x:%02x:%02x:%02x\n",
+			  (u8)FIELD_GET(M10BMC_MAC_BYTE1, macaddr_low),
+			  (u8)FIELD_GET(M10BMC_MAC_BYTE2, macaddr_low),
+			  (u8)FIELD_GET(M10BMC_MAC_BYTE3, macaddr_low),
+			  (u8)FIELD_GET(M10BMC_MAC_BYTE4, macaddr_low),
+			  (u8)FIELD_GET(M10BMC_MAC_BYTE5, macaddr_high),
+			  (u8)FIELD_GET(M10BMC_MAC_BYTE6, macaddr_high));
+}
+static DEVICE_ATTR_RO(mac_address);
+
+static ssize_t mac_count_show(struct device *dev,
+			      struct device_attribute *attr, char *buf)
+{
+	struct intel_m10bmc *ddata = dev_get_drvdata(dev);
+	unsigned int macaddr_high;
+	int ret;
+
+	ret = m10bmc_sys_read(ddata, M10BMC_MAC_HIGH, &macaddr_high);
+	if (ret)
+		return ret;
+
+	return sysfs_emit(buf, "%u\n", (u8)FIELD_GET(M10BMC_MAC_COUNT, macaddr_high));
+}
+static DEVICE_ATTR_RO(mac_count);
+
+static struct attribute *m10bmc_attrs[] = {
+	&dev_attr_bmc_version.attr,
+	&dev_attr_bmcfw_version.attr,
+	&dev_attr_mac_address.attr,
+	&dev_attr_mac_count.attr,
+	NULL,
+};
+
+static const struct attribute_group m10bmc_group = {
+	.attrs = m10bmc_attrs,
+};
+
+const struct attribute_group *m10bmc_dev_groups[] = {
+	&m10bmc_group,
+	NULL,
+};
+EXPORT_SYMBOL_GPL(m10bmc_dev_groups);
+
+int m10bmc_dev_init(struct intel_m10bmc *m10bmc, const struct intel_m10bmc_platform_info *info)
+{
+	int ret;
+
+	m10bmc->info = info;
+	dev_set_drvdata(m10bmc->dev, m10bmc);
+
+	ret = devm_mfd_add_devices(m10bmc->dev, PLATFORM_DEVID_AUTO,
+				   info->cells, info->n_cells,
+				   NULL, 0, NULL);
+	if (ret)
+		dev_err(m10bmc->dev, "Failed to register sub-devices: %d\n", ret);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(m10bmc_dev_init);
+
+MODULE_DESCRIPTION("Intel MAX 10 BMC core driver");
+MODULE_AUTHOR("Intel Corporation");
+MODULE_LICENSE("GPL v2");