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