Driver for TS-4800 syscon. These registers belong to a FPGA that is memory mapped and are used for counters, enable various IPs in the FPGA, control LEDs, control IOs, etc.
Currently, only the watchdog is handled. Signed-off-by: Damien Riegel <[email protected]> --- .../devicetree/bindings/mfd/ts4800-syscon.txt | 12 ++++ drivers/mfd/Kconfig | 7 ++ drivers/mfd/Makefile | 1 + drivers/mfd/ts4800-syscon.c | 84 ++++++++++++++++++++++ include/linux/mfd/ts4800-syscon.h | 24 +++++++ 5 files changed, 128 insertions(+) create mode 100644 Documentation/devicetree/bindings/mfd/ts4800-syscon.txt create mode 100644 drivers/mfd/ts4800-syscon.c create mode 100644 include/linux/mfd/ts4800-syscon.h diff --git a/Documentation/devicetree/bindings/mfd/ts4800-syscon.txt b/Documentation/devicetree/bindings/mfd/ts4800-syscon.txt new file mode 100644 index 0000000..8dbc12c --- /dev/null +++ b/Documentation/devicetree/bindings/mfd/ts4800-syscon.txt @@ -0,0 +1,12 @@ +Technologic Systems Syscon + +Required properties: +- compatible : must be "ts,ts4800-syscon" +- reg : physical base address and length of memory mapped region + +Example: + +syscon@b0010000 { + compatible = "ts,ts4800-syscon"; + reg = <0xb0010000 0x3d>; +}; diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 3f68dd2..8f03dce 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -1302,6 +1302,13 @@ config MFD_TC6393XB help Support for Toshiba Mobile IO Controller TC6393XB +config MFD_TS4800_SYSCON + tristate "TS-4800 Syscon Support" + select REGMAP + select REGMAP_MMIO + help + Support for TS-4800's FPGA Syscon registers + config MFD_VX855 tristate "VIA VX855/VX875 integrated south bridge" depends on PCI diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index ea40e07..e2c0f1b 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -181,6 +181,7 @@ obj-$(CONFIG_MFD_HI6421_PMIC) += hi6421-pmic-core.o obj-$(CONFIG_MFD_DLN2) += dln2.o obj-$(CONFIG_MFD_RT5033) += rt5033.o obj-$(CONFIG_MFD_SKY81452) += sky81452.o +obj-$(CONFIG_MFD_TS4800_SYSCON) += ts4800-syscon.o intel-soc-pmic-objs := intel_soc_pmic_core.o intel_soc_pmic_crc.o obj-$(CONFIG_INTEL_SOC_PMIC) += intel-soc-pmic.o diff --git a/drivers/mfd/ts4800-syscon.c b/drivers/mfd/ts4800-syscon.c new file mode 100644 index 0000000..1e42e96 --- /dev/null +++ b/drivers/mfd/ts4800-syscon.c @@ -0,0 +1,84 @@ +/* + * Device driver for TS-4800 FPGA's syscon + * + * Copyright (c) 2015 - Savoir-faire Linux + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope 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/err.h> +#include <linux/mfd/core.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/mfd/ts4800-syscon.h> + + +static const struct regmap_config ts4800_regmap_config = { + .reg_bits = 32, + .reg_stride = 2, + .val_bits = 16, +}; + +static int ts4800_syscon_probe(struct platform_device *pdev) +{ + struct ts4800_syscon *syscon; + struct resource *res; + void __iomem *base; + + syscon = devm_kzalloc(&pdev->dev, sizeof(*syscon), GFP_KERNEL); + if (!syscon) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + syscon->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base, + &ts4800_regmap_config); + if (IS_ERR(syscon->regmap)) { + dev_err(&pdev->dev, + "regmap init failed: %ld\n", + PTR_ERR(syscon->regmap)); + return PTR_ERR(syscon->regmap); + } + + platform_set_drvdata(pdev, syscon); + + return 0; +} + +static int ts4800_syscon_remove(struct platform_device *pdev) +{ + return 0; +} + +static const struct of_device_id ts4800_syscon_of_match[] = { + { .compatible = "ts,ts4800-syscon", }, + { }, +}; + +static struct platform_driver ts4800_syscon_driver = { + .driver = { + .name = "ts4800_syscon", + .of_match_table = ts4800_syscon_of_match, + }, + .probe = ts4800_syscon_probe, + .remove = ts4800_syscon_remove, +}; +module_platform_driver(ts4800_syscon_driver); + +MODULE_AUTHOR("Damien Riegel <[email protected]>"); +MODULE_DESCRIPTION("TS-4800 Syscon driver"); +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/mfd/ts4800-syscon.h b/include/linux/mfd/ts4800-syscon.h new file mode 100644 index 0000000..3d29184 --- /dev/null +++ b/include/linux/mfd/ts4800-syscon.h @@ -0,0 +1,24 @@ +/* + * Copyright (c) 2015 - Savoir-faire Linux + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope 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. + */ + +#ifndef __LINUX_MFD_TS4800_SYSCON_H +#define __LINUX_MFD_TS4800_SYSCON_H + +#include <linux/regmap.h> + +struct ts4800_syscon { + struct regmap *regmap; +}; + +#endif /* __LINUX_MFD_TS4800_SYSCON_H */ -- 2.5.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
