Release 4.7 drivers/power/reset/at91-poweroff.c
/*
* Atmel AT91 SAM9 SoCs reset code
*
* Copyright (C) 2007 Atmel Corporation.
* Copyright (C) 2011 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
* Copyright (C) 2014 Free Electrons
*
* 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/clk.h>
#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 struct clk *sclk;
static void __init at91_wakeup_status(void)
{
u32 reg = readl(at91_shdwc_base + AT91_SHDW_SR);
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| maxime ripard | maxime ripard | 58 | 96.67% | 1 | 50.00% |
| nicolas ferre | nicolas ferre | 2 | 3.33% | 1 | 50.00% |
| Total | 60 | 100.00% | 2 | 100.00% |
static void at91_poweroff(void)
{
writel(AT91_SHDW_KEY | AT91_SHDW_SHDW, at91_shdwc_base + AT91_SHDW_CR);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| maxime ripard | maxime ripard | 19 | 100.00% | 1 | 100.00% |
| Total | 19 | 100.00% | 1 | 100.00% |
static int at91_poweroff_get_wakeup_mode(struct device_node *np)
{
const char *pm;
unsigned int i;
int err;
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| maxime ripard | maxime ripard | 74 | 92.50% | 1 | 50.00% |
| guenter roeck | guenter roeck | 6 | 7.50% | 1 | 50.00% |
| Total | 80 | 100.00% | 2 | 100.00% |
static void at91_poweroff_dt_set_wakeup_mode(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
int 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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| maxime ripard | maxime ripard | 144 | 99.31% | 1 | 50.00% |
| guenter roeck | guenter roeck | 1 | 0.69% | 1 | 50.00% |
| Total | 145 | 100.00% | 2 | 100.00% |
static int __init at91_poweroff_probe(struct platform_device *pdev)
{
struct resource *res;
int ret;
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);
}
sclk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(sclk))
return PTR_ERR(sclk);
ret = clk_prepare_enable(sclk);
if (ret) {
dev_err(&pdev->dev, "Could not enable slow clock\n");
return ret;
}
at91_wakeup_status();
if (pdev->dev.of_node)
at91_poweroff_dt_set_wakeup_mode(pdev);
pm_power_off = at91_poweroff;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| maxime ripard | maxime ripard | 87 | 61.27% | 1 | 33.33% |
| alexandre belloni | alexandre belloni | 55 | 38.73% | 2 | 66.67% |
| Total | 142 | 100.00% | 3 | 100.00% |
static int __exit at91_poweroff_remove(struct platform_device *pdev)
{
if (pm_power_off == at91_poweroff)
pm_power_off = NULL;
clk_disable_unprepare(sclk);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| alexandre belloni | alexandre belloni | 30 | 100.00% | 2 | 100.00% |
| Total | 30 | 100.00% | 2 | 100.00% |
static const 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 = {
.remove = __exit_p(at91_poweroff_remove),
.driver = {
.name = "at91-poweroff",
.of_match_table = at91_poweroff_of_match,
},
};
module_platform_driver_probe(at91_poweroff_driver, at91_poweroff_probe);
MODULE_AUTHOR("Atmel Corporation");
MODULE_DESCRIPTION("Shutdown driver for Atmel SoCs");
MODULE_LICENSE("GPL v2");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| maxime ripard | maxime ripard | 591 | 82.31% | 1 | 16.67% |
| alexandre belloni | alexandre belloni | 117 | 16.30% | 2 | 33.33% |
| guenter roeck | guenter roeck | 7 | 0.97% | 1 | 16.67% |
| nicolas ferre | nicolas ferre | 2 | 0.28% | 1 | 16.67% |
| fabian frederick | fabian frederick | 1 | 0.14% | 1 | 16.67% |
| Total | 718 | 100.00% | 6 | 100.00% |
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.