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Thu, 29 Sep 2022 09:44:30 +0000 From: Quan Nguyen To: macro@orcam.me.uk, Lee Jones , Bagas Sanjaya , Rob Herring , Krzysztof Kozlowski , Jean Delvare , Guenter Roeck , Jonathan Corbet , Derek Kiernan , Dragan Cvetic , Arnd Bergmann , Greg Kroah-Hartman , Quan Nguyen , Thu Nguyen , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-doc@vger.kernel.org, OpenBMC Maillist , Open Source Submission Subject: [PATCH v9 8/9] mfd: Add Ampere's Altra SMpro MFD driver Date: Thu, 29 Sep 2022 16:43:20 +0700 Message-Id: <20220929094321.770125-9-quan@os.amperecomputing.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220929094321.770125-1-quan@os.amperecomputing.com> References: <20220929094321.770125-1-quan@os.amperecomputing.com> X-ClientProxiedBy: SG2PR01CA0178.apcprd01.prod.exchangelabs.com (2603:1096:4:28::34) To SJ0PR01MB7282.prod.exchangelabs.com (2603:10b6:a03:3f2::24) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ0PR01MB7282:EE_|MN2PR01MB5503:EE_ X-MS-Office365-Filtering-Correlation-Id: 13fcc3d7-07cc-4ac5-09fc-08daa1ff34ce X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Signed-off-by: Quan Nguyen --- Changes in v9: + Rename smpro-mfd.c to smpro-core.c [Lee Jones] + Fix include files in alphabetical order [Lee Jones] + Add defines to avoid using magic numbers [Lee Jones] + Return -EINVAL if device does not match [Lee Jones] + Remove unneccessary comment [Lee Jones] + Refactor error path handling in smpro_core_read/write() [Quan] Changes in v8: + None Changes in v7: + Smpro-mfd now significant changes in compare with simple-mfd-i2c driver, remove the copyright note about simple-mfd-i2c [Quan] + Install bus->read/write() to handle multiple types of bus access. [Quan] + Update license to MODULE_LICENSE("GPL") [Quan] + Add others minor refactor the code [Quan] Changes in v6: + Update license part to reflect that this driver is clone from simple-mfd-i2c driver [Quan] Changes in v5: + Dropped the use of simple-mfd-i2c driver [Quan] + Introduced drivers/mfd/smpro-mfd.c driver to instantiate sub-devices. This is to avoid DT nodes without resource issue [Quan] + Revised commit message [Quan] Changes in v4: + Add "depends on I2C" to fix build issue found by kernel test robot [Guenter] Changes in v3: + None Changes in v2: + Used 'struct of_device_id's .data attribute [Lee Jones] drivers/mfd/Kconfig | 12 ++++ drivers/mfd/Makefile | 1 + drivers/mfd/smpro-core.c | 138 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 151 insertions(+) create mode 100644 drivers/mfd/smpro-core.c diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 8b93856de432..9e77f4762999 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -77,6 +77,18 @@ config MFD_AS3711 help Support for the AS3711 PMIC from AMS +config MFD_SMPRO + tristate "Ampere Computing SMpro core driver" + depends on I2C + select MFD_CORE + select REGMAP_I2C + help + Say yes here to enable SMpro driver support for Ampere's Altra + processor family. + + Ampere's Altra SMpro exposes an I2C regmap interface that can + be accessed by child devices. + config MFD_AS3722 tristate "ams AS3722 Power Management IC" select MFD_CORE diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 7ed3ef4a698c..9387c3ddab4e 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -271,6 +271,7 @@ obj-$(CONFIG_MFD_QCOM_PM8008) += qcom-pm8008.o obj-$(CONFIG_SGI_MFD_IOC3) += ioc3.o obj-$(CONFIG_MFD_SIMPLE_MFD_I2C) += simple-mfd-i2c.o +obj-$(CONFIG_MFD_SMPRO) += smpro-core.o obj-$(CONFIG_MFD_INTEL_M10_BMC) += intel-m10-bmc.o obj-$(CONFIG_MFD_ATC260X) += atc260x-core.o diff --git a/drivers/mfd/smpro-core.c b/drivers/mfd/smpro-core.c new file mode 100644 index 000000000000..d7729cf70378 --- /dev/null +++ b/drivers/mfd/smpro-core.c @@ -0,0 +1,138 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Ampere Altra Family SMPro core driver + * Copyright (c) 2022, Ampere Computing LLC + */ + +#include +#include +#include +#include +#include +#include + +/* Identification Registers */ +#define MANUFACTURER_ID_REG 0x02 +#define AMPERE_MANUFACTURER_ID 0xCD3A + +#define CORE_CE_ERR_DATA 0x82 +#define CORE_UE_ERR_DATA 0x85 +#define MEM_CE_ERR_DATA 0x92 +#define MEM_UE_ERR_DATA 0x95 +#define PCIE_CE_ERR_DATA 0xC2 +#define PCIE_UE_ERR_DATA 0xC5 +#define OTHER_CE_ERR_DATA 0xD2 +#define OTHER_UE_ERR_DATA 0xDA + +static int smpro_core_write(void *context, const void *data, size_t count) +{ + struct device *dev = context; + struct i2c_client *i2c = to_i2c_client(dev); + int ret; + + ret = i2c_master_send(i2c, data, count); + if (unlikely(ret != count)) + return (ret < 0) ? ret : -EIO; + + return 0; +} + +static int smpro_core_read(void *context, const void *reg, size_t reg_size, + void *val, size_t val_size) +{ + struct device *dev = context; + struct i2c_client *i2c = to_i2c_client(dev); + struct i2c_msg xfer[2]; + unsigned char buf[2]; + int ret; + + xfer[0].addr = i2c->addr; + xfer[0].flags = 0; + + buf[0] = *(u8 *)reg; + buf[1] = val_size; + xfer[0].len = 2; + xfer[0].buf = buf; + + xfer[1].addr = i2c->addr; + xfer[1].flags = I2C_M_RD; + xfer[1].len = val_size; + xfer[1].buf = val; + + ret = i2c_transfer(i2c->adapter, xfer, 2); + if (unlikely(ret != 2)) + return (ret < 0) ? ret : -EIO; + + return 0; +} + +static const struct regmap_bus smpro_regmap_bus = { + .read = smpro_core_read, + .write = smpro_core_write, + .val_format_endian_default = REGMAP_ENDIAN_BIG, +}; + +static bool smpro_core_readable_noinc_reg(struct device *dev, unsigned int reg) +{ + return (reg == CORE_CE_ERR_DATA || reg == CORE_UE_ERR_DATA || + reg == MEM_CE_ERR_DATA || reg == MEM_UE_ERR_DATA || + reg == PCIE_CE_ERR_DATA || reg == PCIE_UE_ERR_DATA || + reg == OTHER_CE_ERR_DATA || reg == OTHER_UE_ERR_DATA); +} + +static const struct regmap_config smpro_regmap_config = { + .reg_bits = 8, + .val_bits = 16, + .readable_noinc_reg = smpro_core_readable_noinc_reg, +}; + +static const struct mfd_cell smpro_devs[] = { + MFD_CELL_NAME("smpro-hwmon"), + MFD_CELL_NAME("smpro-errmon"), + MFD_CELL_NAME("smpro-misc"), +}; + +static int smpro_core_probe(struct i2c_client *i2c) +{ + const struct regmap_config *config; + struct regmap *regmap; + unsigned int val; + int ret; + + config = device_get_match_data(&i2c->dev); + if (!config) + return -EINVAL; + + regmap = devm_regmap_init(&i2c->dev, &smpro_regmap_bus, &i2c->dev, config); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + ret = regmap_read(regmap, MANUFACTURER_ID_REG, &val); + if (ret) + return ret; + + if (val != AMPERE_MANUFACTURER_ID) + return -ENODEV; + + return devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO, + smpro_devs, ARRAY_SIZE(smpro_devs), NULL, 0, NULL); +} + +static const struct of_device_id smpro_core_of_match[] = { + { .compatible = "ampere,smpro", .data = &smpro_regmap_config }, + {} +}; +MODULE_DEVICE_TABLE(of, smpro_core_of_match); + +static struct i2c_driver smpro_core_driver = { + .probe_new = smpro_core_probe, + .driver = { + .name = "smpro-core", + .of_match_table = smpro_core_of_match, + }, +}; +module_i2c_driver(smpro_core_driver); + +MODULE_AUTHOR("Quan Nguyen "); +MODULE_DESCRIPTION("SMPRO CORE - I2C driver"); +MODULE_LICENSE("GPL");