diff options
author | Srinivas Kandagatla <srinivas.kandagatla@linaro.org> | 2015-02-18 08:32:14 +0000 |
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committer | Srinivas Kandagatla <srinivas.kandagatla@linaro.org> | 2015-04-07 10:54:01 +0100 |
commit | 485a115a182ebfeada21d6ed4230fe15f1772eb6 (patch) | |
tree | 5bc7f96a881742166adffc722f301b51f887f478 | |
parent | 4616c1774316a10253a13393f02d97799d4f0328 (diff) |
eeprom: qfprom: Add Qualcomm QFPROM support.
This patch adds QFPROM support driver which is used by other drivers
like thermal sensor and cpufreq.
On MSM parts there are some efuses (called qfprom) these fuses store things like
calibration data, speed bins.. etc. Drivers like cpufreq, thermal sensors would
read out this data for configuring the driver.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
-rw-r--r-- | drivers/eeprom/Kconfig | 11 | ||||
-rw-r--r-- | drivers/eeprom/Makefile | 2 | ||||
-rw-r--r-- | drivers/eeprom/qfprom.c | 87 |
3 files changed, 100 insertions, 0 deletions
diff --git a/drivers/eeprom/Kconfig b/drivers/eeprom/Kconfig index ad396c1d498d..8fc14d35364b 100644 --- a/drivers/eeprom/Kconfig +++ b/drivers/eeprom/Kconfig @@ -23,4 +23,15 @@ config EEPROM_SUNXI_SID This driver can also be built as a module. If so, the module will be called eeprom-sunxi-sid. +config QCOM_QFPROM + tristate "QCOM QFPROM Support" + depends on ARCH_QCOM + select REGMAP_MMIO + help + Say y here to enable QFPROM support. The QFPROM provides access + functions for QFPROM data to rest of the drivers via eeprom interface. + + This driver can also be built as a module. If so, the module + will be called eeprom-qfprom. + endif diff --git a/drivers/eeprom/Makefile b/drivers/eeprom/Makefile index 184aa53b741f..4ac437ec15a8 100644 --- a/drivers/eeprom/Makefile +++ b/drivers/eeprom/Makefile @@ -8,3 +8,5 @@ eeprom_core-y := core.o # Devices obj-$(CONFIG_EEPROM_SUNXI_SID) += eeprom-sunxi-sid.o eeprom-sunxi-sid-y := sunxi-sid.o +obj-$(CONFIG_QCOM_QFPROM) += eeprom_qfprom.o +eeprom_qfprom-y := qfprom.o diff --git a/drivers/eeprom/qfprom.c b/drivers/eeprom/qfprom.c new file mode 100644 index 000000000000..8d5d4d889e5d --- /dev/null +++ b/drivers/eeprom/qfprom.c @@ -0,0 +1,87 @@ +/* + * Copyright (C) 2015 Srinivas Kandagatla <srinivas.kandagatla@linaro.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/device.h> +#include <linux/module.h> +#include <linux/err.h> +#include <linux/of.h> +#include <linux/regmap.h> +#include <linux/platform_device.h> +#include <linux/eeprom-provider.h> + +static struct regmap_config qfprom_regmap_config = { + .reg_bits = 32, + .val_bits = 8, + .reg_stride = 1, +}; + +static struct eeprom_config econfig = { + .name = "qfprom", +}; + +static int qfprom_remove(struct platform_device *pdev) +{ + struct eeprom_device *eeprom = platform_get_drvdata(pdev); + + return eeprom_unregister(eeprom); +} + +static int qfprom_probe(struct platform_device *pdev) +{ + struct resource *res; + void __iomem *base; + struct device *dev = &pdev->dev; + struct eeprom_device *eeprom; + struct regmap *regmap; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + base = devm_ioremap_resource(dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + qfprom_regmap_config.max_register = resource_size(res) - 1; + + regmap = devm_regmap_init_mmio(dev, base, + &qfprom_regmap_config); + if (IS_ERR(regmap)) { + dev_err(dev, "regmap init failed\n"); + return PTR_ERR(regmap); + } + econfig.owner = THIS_MODULE; + econfig.dev = dev; + eeprom = eeprom_register(&econfig); + if (IS_ERR(eeprom)) + return PTR_ERR(eeprom); + + platform_set_drvdata(pdev, eeprom); + return 0; +} + +static const struct of_device_id qfprom_of_match[] = { + { .compatible = "qcom,qfprom"}, + {/* sentinel */}, +}; +MODULE_DEVICE_TABLE(of, qfprom_of_match); + +static struct platform_driver qfprom_driver = { + .probe = qfprom_probe, + .remove = qfprom_remove, + .driver = { + .name = "qcom,qfprom", + .of_match_table = qfprom_of_match, + }, +}; +module_platform_driver(qfprom_driver); +MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@linaro.org>"); +MODULE_DESCRIPTION("Qualcomm QFPROM driver"); +MODULE_LICENSE("GPL v2"); |