Commit 97ea1906 authored by Marcin Niestroj's avatar Marcin Niestroj Committed by Alexandre Belloni

rtc: omap: Support ext_wakeup configuration

Support configuration of ext_wakeup sources. This patch makes it
possible to enable ext_wakeup and set it's polarity, depending on board
configuration. AM335x's dedicated PMIC (tps65217) uses ext_wakeup to
notify about power-button presses. Handling power-button presses enables
to recover from RTC-only power states correctly.
Signed-off-by: default avatarMarcin Niestroj <m.niestroj@grinn-global.com>
Acked-by: default avatarTony Lindgren <tony@atomide.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
parent 970fc7f4
......@@ -18,6 +18,18 @@ Optional properties:
through pmic_power_en
- clocks: Any internal or external clocks feeding in to rtc
- clock-names: Corresponding names of the clocks
- pinctrl-0: a phandle pointing to the pin settings for the device
- pinctrl-names: should be "default"
Optional subnodes:
- generic pinctrl node
Required pinctrl subnodes properties:
- pins - Names of ext_wakeup pins to configure
Optional pinctrl subnodes properties:
- input-enable - Enables ext_wakeup
- ti,active-high - Set input active high (by default active low)
Example:
......@@ -30,4 +42,13 @@ rtc@1c23000 {
system-power-controller;
clocks = <&clk_32k_rtc>, <&clk_32768_ck>;
clock-names = "ext-clk", "int-clk";
pinctrl-0 = <&ext_wakeup>;
pinctrl-names = "default";
ext_wakeup: ext-wakeup {
pins = "ext_wakeup0";
input-enable;
ti,active-high;
};
};
......@@ -1245,6 +1245,9 @@ config RTC_DRV_IMXDI
config RTC_DRV_OMAP
tristate "TI OMAP Real Time Clock"
depends on ARCH_OMAP || ARCH_DAVINCI || COMPILE_TEST
depends on OF
depends on PINCTRL
select GENERIC_PINCONF
help
Say "yes" here to support the on chip real time clock
present on TI OMAP1, AM33xx, DA8xx/OMAP-L13x, AM43xx and DRA7xx.
......
......@@ -13,19 +13,23 @@
* 2 of the License, or (at your option) any later version.
*/
#include <linux/kernel.h>
#include <dt-bindings/gpio/gpio.h>
#include <linux/bcd.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <linux/platform_device.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/rtc.h>
/*
* The OMAP RTC is a year/month/day/hours/minutes/seconds BCD clock
......@@ -115,6 +119,8 @@
/* OMAP_RTC_PMIC bit fields: */
#define OMAP_RTC_PMIC_POWER_EN_EN BIT(16)
#define OMAP_RTC_PMIC_EXT_WKUP_EN(x) BIT(x)
#define OMAP_RTC_PMIC_EXT_WKUP_POL(x) BIT(4 + x)
/* OMAP_RTC_KICKER values */
#define KICK0_VALUE 0x83e70b13
......@@ -141,6 +147,7 @@ struct omap_rtc {
bool is_pmic_controller;
bool has_ext_clk;
const struct omap_rtc_device_type *type;
struct pinctrl_dev *pctldev;
};
static inline u8 rtc_read(struct omap_rtc *rtc, unsigned int reg)
......@@ -525,6 +532,139 @@ static const struct of_device_id omap_rtc_of_match[] = {
};
MODULE_DEVICE_TABLE(of, omap_rtc_of_match);
static const struct pinctrl_pin_desc rtc_pins_desc[] = {
PINCTRL_PIN(0, "ext_wakeup0"),
PINCTRL_PIN(1, "ext_wakeup1"),
PINCTRL_PIN(2, "ext_wakeup2"),
PINCTRL_PIN(3, "ext_wakeup3"),
};
static int rtc_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
{
return 0;
}
static const char *rtc_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
unsigned int group)
{
return NULL;
}
static const struct pinctrl_ops rtc_pinctrl_ops = {
.get_groups_count = rtc_pinctrl_get_groups_count,
.get_group_name = rtc_pinctrl_get_group_name,
.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
.dt_free_map = pinconf_generic_dt_free_map,
};
enum rtc_pin_config_param {
PIN_CONFIG_ACTIVE_HIGH = PIN_CONFIG_END + 1,
};
static const struct pinconf_generic_params rtc_params[] = {
{"ti,active-high", PIN_CONFIG_ACTIVE_HIGH, 0},
};
#ifdef CONFIG_DEBUG_FS
static const struct pin_config_item rtc_conf_items[ARRAY_SIZE(rtc_params)] = {
PCONFDUMP(PIN_CONFIG_ACTIVE_HIGH, "input active high", NULL, false),
};
#endif
static int rtc_pinconf_get(struct pinctrl_dev *pctldev,
unsigned int pin, unsigned long *config)
{
struct omap_rtc *rtc = pinctrl_dev_get_drvdata(pctldev);
unsigned int param = pinconf_to_config_param(*config);
u32 val;
u16 arg = 0;
rtc->type->unlock(rtc);
val = rtc_readl(rtc, OMAP_RTC_PMIC_REG);
rtc->type->lock(rtc);
switch (param) {
case PIN_CONFIG_INPUT_ENABLE:
if (!(val & OMAP_RTC_PMIC_EXT_WKUP_EN(pin)))
return -EINVAL;
break;
case PIN_CONFIG_ACTIVE_HIGH:
if (val & OMAP_RTC_PMIC_EXT_WKUP_POL(pin))
return -EINVAL;
break;
default:
return -ENOTSUPP;
};
*config = pinconf_to_config_packed(param, arg);
return 0;
}
static int rtc_pinconf_set(struct pinctrl_dev *pctldev,
unsigned int pin, unsigned long *configs,
unsigned int num_configs)
{
struct omap_rtc *rtc = pinctrl_dev_get_drvdata(pctldev);
u32 val;
unsigned int param;
u16 param_val;
int i;
rtc->type->unlock(rtc);
val = rtc_readl(rtc, OMAP_RTC_PMIC_REG);
rtc->type->lock(rtc);
/* active low by default */
val |= OMAP_RTC_PMIC_EXT_WKUP_POL(pin);
for (i = 0; i < num_configs; i++) {
param = pinconf_to_config_param(configs[i]);
param_val = pinconf_to_config_argument(configs[i]);
switch (param) {
case PIN_CONFIG_INPUT_ENABLE:
if (param_val)
val |= OMAP_RTC_PMIC_EXT_WKUP_EN(pin);
else
val &= ~OMAP_RTC_PMIC_EXT_WKUP_EN(pin);
break;
case PIN_CONFIG_ACTIVE_HIGH:
val &= ~OMAP_RTC_PMIC_EXT_WKUP_POL(pin);
break;
default:
dev_err(&rtc->rtc->dev, "Property %u not supported\n",
param);
return -ENOTSUPP;
}
}
rtc->type->unlock(rtc);
rtc_writel(rtc, OMAP_RTC_PMIC_REG, val);
rtc->type->lock(rtc);
return 0;
}
static const struct pinconf_ops rtc_pinconf_ops = {
.is_generic = true,
.pin_config_get = rtc_pinconf_get,
.pin_config_set = rtc_pinconf_set,
};
static struct pinctrl_desc rtc_pinctrl_desc = {
.pins = rtc_pins_desc,
.npins = ARRAY_SIZE(rtc_pins_desc),
.pctlops = &rtc_pinctrl_ops,
.confops = &rtc_pinconf_ops,
.custom_params = rtc_params,
.num_custom_params = ARRAY_SIZE(rtc_params),
#ifdef CONFIG_DEBUG_FS
.custom_conf_items = rtc_conf_items,
#endif
.owner = THIS_MODULE,
};
static int omap_rtc_probe(struct platform_device *pdev)
{
struct omap_rtc *rtc;
......@@ -681,6 +821,15 @@ static int omap_rtc_probe(struct platform_device *pdev)
}
}
/* Support ext_wakeup pinconf */
rtc_pinctrl_desc.name = dev_name(&pdev->dev);
rtc->pctldev = pinctrl_register(&rtc_pinctrl_desc, &pdev->dev, rtc);
if (IS_ERR(rtc->pctldev)) {
dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
return PTR_ERR(rtc->pctldev);
}
return 0;
err:
......@@ -724,6 +873,9 @@ static int __exit omap_rtc_remove(struct platform_device *pdev)
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
/* Remove ext_wakeup pinconf */
pinctrl_unregister(rtc->pctldev);
return 0;
}
......
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