diff options
Diffstat (limited to 'drivers/mfd/intel-m10-bmc-spi.c')
| -rw-r--r-- | drivers/mfd/intel-m10-bmc-spi.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/drivers/mfd/intel-m10-bmc-spi.c b/drivers/mfd/intel-m10-bmc-spi.c new file mode 100644 index 0000000000..cbeb7de9e0 --- /dev/null +++ b/drivers/mfd/intel-m10-bmc-spi.c @@ -0,0 +1,183 @@ +// 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/dev_printk.h> +#include <linux/init.h> +#include <linux/mfd/core.h> +#include <linux/mfd/intel-m10-bmc.h> +#include <linux/module.h> +#include <linux/regmap.h> +#include <linux/spi/spi.h> + +static const struct regmap_range m10bmc_regmap_range[] = { + regmap_reg_range(M10BMC_N3000_LEGACY_BUILD_VER, M10BMC_N3000_LEGACY_BUILD_VER), + regmap_reg_range(M10BMC_N3000_SYS_BASE, M10BMC_N3000_SYS_END), + regmap_reg_range(M10BMC_N3000_FLASH_BASE, M10BMC_N3000_FLASH_END), +}; + +static const struct regmap_access_table m10bmc_access_table = { + .yes_ranges = m10bmc_regmap_range, + .n_yes_ranges = ARRAY_SIZE(m10bmc_regmap_range), +}; + +static struct regmap_config intel_m10bmc_regmap_config = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, + .wr_table = &m10bmc_access_table, + .rd_table = &m10bmc_access_table, + .max_register = M10BMC_N3000_MEM_END, +}; + +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. In the + * old BMC chips, the BMC version info is stored in the old version + * register (M10BMC_N3000_LEGACY_BUILD_VER), so its read out value would have + * not been M10BMC_N3000_VER_LEGACY_INVALID (0xffffffff). But in new BMC + * chips that the driver supports, the value of this register should be + * M10BMC_N3000_VER_LEGACY_INVALID. + */ + ret = m10bmc_raw_read(ddata, M10BMC_N3000_LEGACY_BUILD_VER, &v); + if (ret) + return -ENODEV; + + if (v != M10BMC_N3000_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); + const struct intel_m10bmc_platform_info *info; + struct device *dev = &spi->dev; + struct intel_m10bmc *ddata; + int ret; + + ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL); + if (!ddata) + return -ENOMEM; + + info = (struct intel_m10bmc_platform_info *)id->driver_data; + 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; + } + + return m10bmc_dev_init(ddata, info); +} + +static const struct m10bmc_csr_map m10bmc_n3000_csr_map = { + .base = M10BMC_N3000_SYS_BASE, + .build_version = M10BMC_N3000_BUILD_VER, + .fw_version = NIOS2_N3000_FW_VERSION, + .mac_low = M10BMC_N3000_MAC_LOW, + .mac_high = M10BMC_N3000_MAC_HIGH, + .doorbell = M10BMC_N3000_DOORBELL, + .auth_result = M10BMC_N3000_AUTH_RESULT, + .bmc_prog_addr = M10BMC_N3000_BMC_PROG_ADDR, + .bmc_reh_addr = M10BMC_N3000_BMC_REH_ADDR, + .bmc_magic = M10BMC_N3000_BMC_PROG_MAGIC, + .sr_prog_addr = M10BMC_N3000_SR_PROG_ADDR, + .sr_reh_addr = M10BMC_N3000_SR_REH_ADDR, + .sr_magic = M10BMC_N3000_SR_PROG_MAGIC, + .pr_prog_addr = M10BMC_N3000_PR_PROG_ADDR, + .pr_reh_addr = M10BMC_N3000_PR_REH_ADDR, + .pr_magic = M10BMC_N3000_PR_PROG_MAGIC, + .rsu_update_counter = M10BMC_N3000_STAGING_FLASH_COUNT, +}; + +static struct mfd_cell m10bmc_d5005_subdevs[] = { + { .name = "d5005bmc-hwmon" }, + { .name = "d5005bmc-sec-update" }, +}; + +static const struct regmap_range m10bmc_d5005_fw_handshake_regs[] = { + regmap_reg_range(M10BMC_N3000_TELEM_START, M10BMC_D5005_TELEM_END), +}; + +static struct mfd_cell m10bmc_pacn3000_subdevs[] = { + { .name = "n3000bmc-hwmon" }, + { .name = "n3000bmc-retimer" }, + { .name = "n3000bmc-sec-update" }, +}; + +static const struct regmap_range m10bmc_n3000_fw_handshake_regs[] = { + regmap_reg_range(M10BMC_N3000_TELEM_START, M10BMC_N3000_TELEM_END), +}; + +static struct mfd_cell m10bmc_n5010_subdevs[] = { + { .name = "n5010bmc-hwmon" }, +}; + +static const struct intel_m10bmc_platform_info m10bmc_spi_n3000 = { + .cells = m10bmc_pacn3000_subdevs, + .n_cells = ARRAY_SIZE(m10bmc_pacn3000_subdevs), + .handshake_sys_reg_ranges = m10bmc_n3000_fw_handshake_regs, + .handshake_sys_reg_nranges = ARRAY_SIZE(m10bmc_n3000_fw_handshake_regs), + .csr_map = &m10bmc_n3000_csr_map, +}; + +static const struct intel_m10bmc_platform_info m10bmc_spi_d5005 = { + .cells = m10bmc_d5005_subdevs, + .n_cells = ARRAY_SIZE(m10bmc_d5005_subdevs), + .handshake_sys_reg_ranges = m10bmc_d5005_fw_handshake_regs, + .handshake_sys_reg_nranges = ARRAY_SIZE(m10bmc_d5005_fw_handshake_regs), + .csr_map = &m10bmc_n3000_csr_map, +}; + +static const struct intel_m10bmc_platform_info m10bmc_spi_n5010 = { + .cells = m10bmc_n5010_subdevs, + .n_cells = ARRAY_SIZE(m10bmc_n5010_subdevs), + .handshake_sys_reg_ranges = m10bmc_n3000_fw_handshake_regs, + .handshake_sys_reg_nranges = ARRAY_SIZE(m10bmc_n3000_fw_handshake_regs), + .csr_map = &m10bmc_n3000_csr_map, +}; + +static const struct spi_device_id m10bmc_spi_id[] = { + { "m10-n3000", (kernel_ulong_t)&m10bmc_spi_n3000 }, + { "m10-d5005", (kernel_ulong_t)&m10bmc_spi_d5005 }, + { "m10-n5010", (kernel_ulong_t)&m10bmc_spi_n5010 }, + { } +}; +MODULE_DEVICE_TABLE(spi, m10bmc_spi_id); + +static struct spi_driver intel_m10bmc_spi_driver = { + .driver = { + .name = "intel-m10-bmc", + .dev_groups = m10bmc_dev_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 SPI bus interface"); +MODULE_AUTHOR("Intel Corporation"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("spi:intel-m10-bmc"); +MODULE_IMPORT_NS(INTEL_M10_BMC_CORE); |