On Jul 3, 2014, at 10:14 PM, Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx> wrote: > > Add a driver to handle the shutdown of the Atmel SoCs. This code used to be > (and still is) in arch/arm/mach-at91. We didn't removed it yet so that we can > convert all the boards to using this driver, before removing it entirely in a > separate patch. > > Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx> > --- > drivers/power/reset/Kconfig | 7 ++ > drivers/power/reset/Makefile | 1 + > drivers/power/reset/at91-poweroff.c | 156 ++++++++++++++++++++++++++++++++++++ > 3 files changed, 164 insertions(+) > create mode 100644 drivers/power/reset/at91-poweroff.c > > diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig > index b3fef01d7cbb..f9d53af50ec0 100644 > --- a/drivers/power/reset/Kconfig > +++ b/drivers/power/reset/Kconfig > @@ -14,6 +14,13 @@ config POWER_RESET_AS3722 > help > This driver supports turning off board via a ams AS3722 power-off. > > +config POWER_RESET_AT91_POWEROFF > + bool "Atmel AT91 poweroff driver" > + default SOC_AT91SAM9 || SOC_SAMA5 > + help > + This driver supports poweroff for Atmel AT91SAM9 and SAMA5 > + SoCs > + > config POWER_RESET_AT91_RESET > bool "Atmel AT91 reset driver" > default SOC_AT91SAM9 || SOC_SAMA5 > diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile > index 1599214b91d9..8bf941bac3da 100644 > --- a/drivers/power/reset/Makefile > +++ b/drivers/power/reset/Makefile > @@ -1,4 +1,5 @@ > obj-$(CONFIG_POWER_RESET_AS3722) += as3722-poweroff.o > +obj-$(CONFIG_POWER_RESET_AT91_POWEROFF) += at91-poweroff.o > obj-$(CONFIG_POWER_RESET_AT91_RESET) += at91-reset.o > obj-$(CONFIG_POWER_RESET_AXXIA) += axxia-reset.o > obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o > diff --git a/drivers/power/reset/at91-poweroff.c b/drivers/power/reset/at91-poweroff.c > new file mode 100644 > index 000000000000..2f2a69e9bae3 > --- /dev/null > +++ b/drivers/power/reset/at91-poweroff.c > @@ -0,0 +1,156 @@ > +/* > + * Atmel AT91 SAM9 SoCs reset code > + * > + * Copyright (C) 2014 Maxime Ripard > + * > + * Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx> > + * As it’s mostly a copy of other people work you can not claim the copyright > + * This file is licensed under the terms of the GNU General Public > + * License version 2. This program is licensed "as is" without any > + * warranty of any kind, whether express or implied. > + */ > + > +#include <linux/io.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/platform_device.h> > +#include <linux/printk.h> > + > +#define AT91_SHDW_CR 0x00 /* Shut Down Control Register */ > +#define AT91_SHDW_SHDW BIT(0) /* Shut Down command */ > +#define AT91_SHDW_KEY (0xa5 << 24) /* KEY Password */ > + > +#define AT91_SHDW_MR 0x04 /* Shut Down Mode Register */ > +#define AT91_SHDW_WKMODE0 GENMASK(2, 0) /* Wake-up 0 Mode Selection */ > +#define AT91_SHDW_CPTWK0_MAX 0xf /* Maximum Counter On Wake Up 0 */ > +#define AT91_SHDW_CPTWK0 (AT91_SHDW_CPTWK0_MAX << 4) /* Counter On Wake Up 0 */ > +#define AT91_SHDW_CPTWK0_(x) ((x) << 4) > +#define AT91_SHDW_RTTWKEN BIT(16) /* Real Time Timer Wake-up Enable */ > +#define AT91_SHDW_RTCWKEN BIT(17) /* Real Time Clock Wake-up Enable */ > + > +#define AT91_SHDW_SR 0x08 /* Shut Down Status Register */ > +#define AT91_SHDW_WAKEUP0 BIT(0) /* Wake-up 0 Status */ > +#define AT91_SHDW_RTTWK BIT(16) /* Real-time Timer Wake-up */ > +#define AT91_SHDW_RTCWK BIT(17) /* Real-time Clock Wake-up [SAM9RL] */ > + > +enum wakeup_type { > + AT91_SHDW_WKMODE0_NONE = 0, > + AT91_SHDW_WKMODE0_HIGH = 1, > + AT91_SHDW_WKMODE0_LOW = 2, > + AT91_SHDW_WKMODE0_ANYLEVEL = 3, > +}; > + > +static const char *shdwc_wakeup_modes[] = { > + [AT91_SHDW_WKMODE0_NONE] = "none", > + [AT91_SHDW_WKMODE0_HIGH] = "high", > + [AT91_SHDW_WKMODE0_LOW] = "low", > + [AT91_SHDW_WKMODE0_ANYLEVEL] = "any", > +}; > + > +static void __iomem *at91_shdwc_base; > + > +static void __init at91_wakeup_status(void) > +{ > + u32 reg = readl(at91_shdwc_base); > + char *reason = "unknown"; > + > + /* Simple power-on, just bail out */ > + if (!reg) > + return; > + > + if (reg & AT91_SHDW_RTTWK) > + reason = "RTT"; > + else if (reg & AT91_SHDW_RTCWK) > + reason = "RTC"; > + > + pr_info("AT91: Wake-Up source: %s\n", reason); > +} > + > +static void at91_poweroff(void) > +{ > + writel(AT91_SHDW_KEY | AT91_SHDW_SHDW, at91_shdwc_base + AT91_SHDW_CR); > +} > + > +const enum wakeup_type at91_poweroff_get_wakeup_mode(struct device_node *np) > +{ > + const char *pm; > + int err, i; > + > + err = of_property_read_string(np, "atmel,wakeup-mode", &pm); > + if (err < 0) > + return AT91_SHDW_WKMODE0_ANYLEVEL; > + > + for (i = 0; i < ARRAY_SIZE(shdwc_wakeup_modes); i++) > + if (!strcasecmp(pm, shdwc_wakeup_modes[i])) > + return i; > + > + return -ENODEV; > +} > + > +static void at91_poweroff_dt_set_wakeup_mode(struct platform_device *pdev) > +{ > + struct device_node *np = pdev->dev.of_node; > + enum wakeup_type wakeup_mode; > + u32 mode = 0, tmp; > + > + wakeup_mode = at91_poweroff_get_wakeup_mode(np); > + if (wakeup_mode < 0) { > + dev_warn(&pdev->dev, "shdwc unknown wakeup mode\n"); > + return; > + } > + > + if (!of_property_read_u32(np, "atmel,wakeup-counter", &tmp)) { > + if (tmp > AT91_SHDW_CPTWK0_MAX) { > + dev_warn(&pdev->dev, > + "shdwc wakeup counter 0x%x > 0x%x reduce it to 0x%x\n", > + tmp, AT91_SHDW_CPTWK0_MAX, AT91_SHDW_CPTWK0_MAX); > + tmp = AT91_SHDW_CPTWK0_MAX; > + } > + mode |= AT91_SHDW_CPTWK0_(tmp); > + } > + > + if (of_property_read_bool(np, "atmel,wakeup-rtc-timer")) > + mode |= AT91_SHDW_RTCWKEN; > + > + if (of_property_read_bool(np, "atmel,wakeup-rtt-timer")) > + mode |= AT91_SHDW_RTTWKEN; > + > + writel(wakeup_mode | mode, at91_shdwc_base + AT91_SHDW_MR); > +} > + > +static int at91_poweroff_probe(struct platform_device *pdev) > +{ > + struct resource *res; > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + at91_shdwc_base = devm_ioremap_resource(&pdev->dev, res); > + if (IS_ERR(at91_shdwc_base)) { > + dev_err(&pdev->dev, "Could not map reset controller address\n"); > + return PTR_ERR(at91_shdwc_base); > + } > + > + at91_wakeup_status(); > + > + if (pdev->dev.of_node) > + at91_poweroff_dt_set_wakeup_mode(pdev); > + > + pm_power_off = at91_poweroff; > + > + return 0; > +} > + > +static struct of_device_id at91_poweroff_of_match[] = { > + { .compatible = "atmel,at91sam9260-shdwc", }, > + { .compatible = "atmel,at91sam9rl-shdwc", }, > + { .compatible = "atmel,at91sam9x5-shdwc", }, > + { /*sentinel*/ } > +}; > + > +static struct platform_driver at91_poweroff_driver = { > + .probe = at91_poweroff_probe, > + .driver = { > + .name = "at91-poweroff", > + .of_match_table = at91_poweroff_of_match, > + }, > +}; > +module_platform_driver(at91_poweroff_driver); > -- > 2.0.1 > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html