[PATCH v1 3/4] mfd: intel-m10-bmc: add PMCI driver

From: Tianfei Zhang
Date: Mon Jun 06 2022 - 23:33:35 EST

Adding a driver for the PMCI-base interface of Intel MAX10
BMC controller.

PMCI(Platform Management Control Interface) is a software-visible
interface, conneted to card BMC which provided telemetry and mailbox
functionalities.

Signed-off-by: Tianfei Zhang <tianfei.zhang@xxxxxxxxx>
Signed-off-by: Russ Weight <russell.h.weight@xxxxxxxxx>
---
.../ABI/testing/sysfs-driver-intel-m10-bmc | 8 +-
drivers/mfd/Kconfig | 12 +++
drivers/mfd/Makefile | 1 +
drivers/mfd/intel-m10-bmc-core.c | 23 ++++-
drivers/mfd/intel-m10-bmc-pmci.c | 88 +++++++++++++++++++
include/linux/mfd/intel-m10-bmc.h | 8 ++
6 files changed, 132 insertions(+), 8 deletions(-)
create mode 100644 drivers/mfd/intel-m10-bmc-pmci.c

diff --git a/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc b/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc
index 9773925138af..a8ab58035c95 100644
--- a/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc
+++ b/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc
@@ -1,4 +1,4 @@
-What: /sys/bus/spi/devices/.../bmc_version
+What: /sys/bus/.../drivers/intel-m10-bmc/.../bmc_version
Date: June 2020
KernelVersion: 5.10
Contact: Xu Yilun <yilun.xu@xxxxxxxxx>
@@ -6,7 +6,7 @@ Description: Read only. Returns the hardware build version of Intel
MAX10 BMC chip.
Format: "0x%x".

-What: /sys/bus/spi/devices/.../bmcfw_version
+What: /sys/bus/.../drivers/intel-m10-bmc/.../bmcfw_version
Date: June 2020
KernelVersion: 5.10
Contact: Xu Yilun <yilun.xu@xxxxxxxxx>
@@ -14,7 +14,7 @@ Description: Read only. Returns the firmware version of Intel MAX10
BMC chip.
Format: "0x%x".

-What: /sys/bus/spi/devices/.../mac_address
+What: /sys/bus/.../drivers/intel-m10-bmc/.../mac_address
Date: January 2021
KernelVersion: 5.12
Contact: Russ Weight <russell.h.weight@xxxxxxxxx>
@@ -25,7 +25,7 @@ Description: Read only. Returns the first MAC address in a block
space.
Format: "%02x:%02x:%02x:%02x:%02x:%02x".

-What: /sys/bus/spi/devices/.../mac_count
+What: /sys/bus/.../drivers/intel-m10-bmc/.../mac_count
Date: January 2021
KernelVersion: 5.12
Contact: Russ Weight <russell.h.weight@xxxxxxxxx>
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index ee8398b02321..7300efec3617 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -2177,6 +2177,18 @@ config MFD_INTEL_M10_BMC_SPI
additional drivers must be enabled in order to use the functionality
of the device.

+config MFD_INTEL_M10_BMC_PMCI
+ tristate "Intel MAX 10 Board Management Controller with PMCI"
+ depends on FPGA_DFL
+ select MFD_INTEL_M10_BMC_CORE
+ select REGMAP_INDIRECT_REGISTER
+ help
+ Support for the Intel MAX 10 board management controller via PMCI.
+
+ This driver provides common support for accessing the device,
+ additional drivers must be enabled in order to use the functionality
+ of the device.
+
config MFD_RSMU_I2C
tristate "Renesas Synchronization Management Unit with I2C"
depends on I2C && OF
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index b5d3263c1205..a8ffdc223cf7 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -270,6 +270,7 @@ obj-$(CONFIG_MFD_SIMPLE_MFD_I2C) += simple-mfd-i2c.o
intel-m10-bmc-objs := intel-m10-bmc-core.o
obj-$(CONFIG_MFD_INTEL_M10_BMC_CORE) += intel-m10-bmc.o
obj-$(CONFIG_MFD_INTEL_M10_BMC_SPI) += intel-m10-bmc-spi.o
+obj-$(CONFIG_MFD_INTEL_M10_BMC_PMCI) += intel-m10-bmc-pmci.o

obj-$(CONFIG_MFD_ATC260X) += atc260x-core.o
obj-$(CONFIG_MFD_ATC260X_I2C) += atc260x-i2c.o
diff --git a/drivers/mfd/intel-m10-bmc-core.c b/drivers/mfd/intel-m10-bmc-core.c
index f6dc549e1bc3..20796f0c4a20 100644
--- a/drivers/mfd/intel-m10-bmc-core.c
+++ b/drivers/mfd/intel-m10-bmc-core.c
@@ -10,6 +10,15 @@
#include <linux/mfd/intel-m10-bmc.h>
#include <linux/module.h>

+static struct mfd_cell m10bmc_n6000_bmc_subdevs[] = {
+ { .name = "n6000bmc-hwmon" },
+ { .name = "n6000bmc-sec-update" }
+};
+
+static const struct regmap_range n6000_fw_handshake_regs[] = {
+ regmap_reg_range(M10BMC_PMCI_TELEM_START, M10BMC_PMCI_TELEM_END),
+};
+
static struct mfd_cell m10bmc_d5005_subdevs[] = {
{ .name = "d5005bmc-hwmon" },
};
@@ -146,10 +155,12 @@ int m10bmc_dev_init(struct intel_m10bmc *m10bmc)

dev_set_drvdata(m10bmc->dev, m10bmc);

- ret = check_m10bmc_version(m10bmc);
- if (ret) {
- dev_err(m10bmc->dev, "Failed to identify m10bmc hardware\n");
- return ret;
+ if (type == M10_N3000 || type == M10_D5005 || type == M10_N5010) {
+ ret = check_m10bmc_version(m10bmc);
+ if (ret) {
+ dev_err(m10bmc->dev, "Failed to identify m10bmc hardware\n");
+ return ret;
+ }
}

switch (type) {
@@ -165,6 +176,10 @@ int m10bmc_dev_init(struct intel_m10bmc *m10bmc)
cells = m10bmc_n5010_subdevs;
n_cell = ARRAY_SIZE(m10bmc_n5010_subdevs);
break;
+ case M10_N6000:
+ cells = m10bmc_n6000_bmc_subdevs;
+ n_cell = ARRAY_SIZE(m10bmc_n6000_bmc_subdevs);
+ break;
default:
return -ENODEV;
}
diff --git a/drivers/mfd/intel-m10-bmc-pmci.c b/drivers/mfd/intel-m10-bmc-pmci.c
new file mode 100644
index 000000000000..319397774d6e
--- /dev/null
+++ b/drivers/mfd/intel-m10-bmc-pmci.c
@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PMCI-based interface to MAX10 BMC
+ *
+ * Copyright (C) 2020-2022 Intel Corporation, Inc.
+ *
+ */
+
+#include <linux/dfl.h>
+#include <linux/mfd/intel-m10-bmc.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+#define M10BMC_PMCI_INDIRECT_BASE 0x400
+
+struct pmci_device {
+ void __iomem *base;
+ struct device *dev;
+ struct intel_m10bmc m10bmc;
+};
+
+static const struct regmap_range m10bmc_pmci_regmap_range[] = {
+ regmap_reg_range(M10BMC_PMCI_SYS_BASE, M10BMC_PMCI_SYS_END),
+};
+
+static const struct regmap_access_table m10_access_table = {
+ .yes_ranges = m10bmc_pmci_regmap_range,
+ .n_yes_ranges = ARRAY_SIZE(m10bmc_pmci_regmap_range),
+};
+
+static struct regmap_config m10bmc_pmci_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .wr_table = &m10_access_table,
+ .rd_table = &m10_access_table,
+ .max_register = M10BMC_PMCI_SYS_END,
+};
+
+static int pmci_probe(struct dfl_device *ddev)
+{
+ struct device *dev = &ddev->dev;
+ struct pmci_device *pmci;
+
+ pmci = devm_kzalloc(dev, sizeof(*pmci), GFP_KERNEL);
+ if (!pmci)
+ return -ENOMEM;
+
+ pmci->m10bmc.dev = dev;
+ pmci->dev = dev;
+ pmci->m10bmc.type = M10_N6000;
+
+ pmci->base = devm_ioremap_resource(dev, &ddev->mmio_res);
+ if (IS_ERR(pmci->base))
+ return PTR_ERR(pmci->base);
+
+ pmci->m10bmc.regmap =
+ devm_regmap_init_indirect_register(dev,
+ pmci->base + M10BMC_PMCI_INDIRECT_BASE,
+ &m10bmc_pmci_regmap_config);
+ if (IS_ERR(pmci->m10bmc.regmap))
+ return PTR_ERR(pmci->m10bmc.regmap);
+
+ return m10bmc_dev_init(&pmci->m10bmc);
+}
+
+#define FME_FEATURE_ID_PMCI_BMC 0x12
+
+static const struct dfl_device_id pmci_ids[] = {
+ { FME_ID, FME_FEATURE_ID_PMCI_BMC },
+ { }
+};
+MODULE_DEVICE_TABLE(dfl, pmci_ids);
+
+static struct dfl_driver pmci_driver = {
+ .drv = {
+ .name = "intel-m10-bmc",
+ .dev_groups = m10bmc_dev_groups,
+ },
+ .id_table = pmci_ids,
+ .probe = pmci_probe,
+};
+
+module_dfl_driver(pmci_driver);
+
+MODULE_DESCRIPTION("MAX10 BMC PMCI-based interface");
+MODULE_AUTHOR("Intel Corporation");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/intel-m10-bmc.h b/include/linux/mfd/intel-m10-bmc.h
index dd81ffdcf168..83c4d3993dcb 100644
--- a/include/linux/mfd/intel-m10-bmc.h
+++ b/include/linux/mfd/intel-m10-bmc.h
@@ -118,11 +118,19 @@
/* Address of 4KB inverted bit vector containing staging area FLASH count */
#define STAGING_FLASH_COUNT 0x17ffb000

+#define M10BMC_PMCI_SYS_BASE 0x0
+#define M10BMC_PMCI_SYS_END 0xfff
+
+/* Telemetry registers */
+#define M10BMC_PMCI_TELEM_START 0x400
+#define M10BMC_PMCI_TELEM_END 0x78c
+
/* Supported MAX10 BMC types */
enum m10bmc_type {
M10_N3000,
M10_D5005,
M10_N5010,
+ M10_N6000
};

/**
--
2.26.2