The Atmel System Timer IP available on the at91rm9200 exposes both a timer and a watchdog. Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxxxxxxxxx> --- drivers/mfd/Kconfig | 7 ++++ drivers/mfd/Makefile | 1 + drivers/mfd/atmel-st.c | 76 ++++++++++++++++++++++++++++++++++++++++++++ include/linux/mfd/atmel-st.h | 47 +++++++++++++++++++++++++++ 4 files changed, 131 insertions(+) create mode 100644 drivers/mfd/atmel-st.c create mode 100644 include/linux/mfd/atmel-st.h diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 2e6b7311fabc..3c5185c0cf06 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -78,6 +78,13 @@ config MFD_BCM590XX help Support for the BCM590xx PMUs from Broadcom +config MFD_ATMEL_ST + bool "Atmel System Timer" + select MFD_CORE + default SOC_AT91RM9200 + help + If you say Y here you get support for the Atmel System Timer. + config MFD_AXP20X bool "X-Powers AXP20X" select MFD_CORE diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 53467e211381..1ecd416f25c5 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -104,6 +104,7 @@ obj-$(CONFIG_PMIC_DA9052) += da9052-core.o obj-$(CONFIG_MFD_DA9052_SPI) += da9052-spi.o obj-$(CONFIG_MFD_DA9052_I2C) += da9052-i2c.o obj-$(CONFIG_MFD_AXP20X) += axp20x.o +obj-$(CONFIG_MFD_ATMEL_ST) += atmel-st.o obj-$(CONFIG_MFD_LP3943) += lp3943.o obj-$(CONFIG_MFD_LP8788) += lp8788.o lp8788-irq.o diff --git a/drivers/mfd/atmel-st.c b/drivers/mfd/atmel-st.c new file mode 100644 index 000000000000..5af83cbfe404 --- /dev/null +++ b/drivers/mfd/atmel-st.c @@ -0,0 +1,76 @@ +/* + * Copyright (C) 2014 Free Electrons + * Copyright (C) 2014 Atmel + * + * Author: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxxxxxxxxx> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License 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. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/mfd/atmel-st.h> +#include <linux/mfd/core.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> + +static const struct mfd_cell atmel_st_cells[] = { + { + .name = "atmel_st_timer", + }, + { + .name = "atmel_st_watchdog", + }, +}; + +static int atmel_st_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct regmap *regmap_st; + + regmap_st = syscon_node_to_regmap(dev->of_node); + if (IS_ERR(regmap_st)) + return PTR_ERR(regmap_st); + dev_set_drvdata(dev, regmap_st); + + return mfd_add_devices(dev, -1, atmel_st_cells, + ARRAY_SIZE(atmel_st_cells), + NULL, 0, NULL); +} + +static int atmel_st_remove(struct platform_device *pdev) +{ + mfd_remove_devices(&pdev->dev); + + return 0; +} + +static const struct of_device_id atmel_st_match[] = { + { .compatible = "atmel,at91rm9200-st" }, + { /* sentinel */ }, +}; + +static struct platform_driver atmel_st_driver = { + .probe = atmel_st_probe, + .remove = atmel_st_remove, + .driver = { + .name = "atmel-system-timer", + .of_match_table = atmel_st_match, + }, +}; +module_platform_driver(atmel_st_driver); + +MODULE_ALIAS("platform:atmel-st"); +MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@xxxxxxxxxxxxxxxxxx>"); +MODULE_DESCRIPTION("Atmel ST (System Timer) driver"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/mfd/atmel-st.h b/include/linux/mfd/atmel-st.h new file mode 100644 index 000000000000..88c6cf8eeb2b --- /dev/null +++ b/include/linux/mfd/atmel-st.h @@ -0,0 +1,47 @@ +/* + * Copyright (C) 2005 Ivan Kokshaysky + * Copyright (C) SAN People + * + * System Timer (ST) - System peripherals registers. + * Based on AT91RM9200 datasheet revision E. + * + * 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. + */ + +#ifndef __LINUX_MFD_ATMEL_ST_H +#define __LINUX_MFD_ATMEL_ST_H + +#define AT91_ST_CR 0x00 /* Control Register */ +#define AT91_ST_WDRST (1 << 0) /* Watchdog Timer Restart */ + +#define AT91_ST_PIMR 0x04 /* Period Interval Mode Register */ +#define AT91_ST_PIV (0xffff << 0) /* Period Interval Value */ + +#define AT91_ST_WDMR 0x08 /* Watchdog Mode Register */ +#define AT91_ST_WDV (0xffff << 0) /* Watchdog Counter Value */ +#define AT91_ST_RSTEN (1 << 16) /* Reset Enable */ +#define AT91_ST_EXTEN (1 << 17) /* External Signal Assertion Enable */ + +#define AT91_ST_RTMR 0x0c /* Real-time Mode Register */ +#define AT91_ST_RTPRES (0xffff << 0) /* Real-time Prescalar Value */ + +#define AT91_ST_SR 0x10 /* Status Register */ +#define AT91_ST_PITS (1 << 0) /* Period Interval Timer Status */ +#define AT91_ST_WDOVF (1 << 1) /* Watchdog Overflow */ +#define AT91_ST_RTTINC (1 << 2) /* Real-time Timer Increment */ +#define AT91_ST_ALMS (1 << 3) /* Alarm Status */ + +#define AT91_ST_IER 0x14 /* Interrupt Enable Register */ +#define AT91_ST_IDR 0x18 /* Interrupt Disable Register */ +#define AT91_ST_IMR 0x1c /* Interrupt Mask Register */ + +#define AT91_ST_RTAR 0x20 /* Real-time Alarm Register */ +#define AT91_ST_ALMV (0xfffff << 0) /* Alarm Value */ + +#define AT91_ST_CRTR 0x24 /* Current Real-time Register */ +#define AT91_ST_CRTV (0xfffff << 0) /* Current Real-Time Value */ + +#endif /* __LINUX_MFD_ATMEL_ST_H */ -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-watchdog" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
