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path: root/drivers/power/reset/qcom-pon.c
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Diffstat (limited to 'drivers/power/reset/qcom-pon.c')
-rw-r--r--drivers/power/reset/qcom-pon.c108
1 files changed, 108 insertions, 0 deletions
diff --git a/drivers/power/reset/qcom-pon.c b/drivers/power/reset/qcom-pon.c
new file mode 100644
index 0000000000..1344b361a4
--- /dev/null
+++ b/drivers/power/reset/qcom-pon.c
@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2017-18 Linaro Limited
+
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+#include <linux/reboot-mode.h>
+#include <linux/regmap.h>
+
+#define PON_SOFT_RB_SPARE 0x8f
+
+#define GEN1_REASON_SHIFT 2
+#define GEN2_REASON_SHIFT 1
+
+#define NO_REASON_SHIFT 0
+
+struct pm8916_pon {
+ struct device *dev;
+ struct regmap *regmap;
+ u32 baseaddr;
+ struct reboot_mode_driver reboot_mode;
+ long reason_shift;
+};
+
+static int pm8916_reboot_mode_write(struct reboot_mode_driver *reboot,
+ unsigned int magic)
+{
+ struct pm8916_pon *pon = container_of
+ (reboot, struct pm8916_pon, reboot_mode);
+ int ret;
+
+ ret = regmap_update_bits(pon->regmap,
+ pon->baseaddr + PON_SOFT_RB_SPARE,
+ GENMASK(7, pon->reason_shift),
+ magic << pon->reason_shift);
+ if (ret < 0)
+ dev_err(pon->dev, "update reboot mode bits failed\n");
+
+ return ret;
+}
+
+static int pm8916_pon_probe(struct platform_device *pdev)
+{
+ struct pm8916_pon *pon;
+ long reason_shift;
+ int error;
+
+ pon = devm_kzalloc(&pdev->dev, sizeof(*pon), GFP_KERNEL);
+ if (!pon)
+ return -ENOMEM;
+
+ pon->dev = &pdev->dev;
+
+ pon->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+ if (!pon->regmap) {
+ dev_err(&pdev->dev, "failed to locate regmap\n");
+ return -ENODEV;
+ }
+
+ error = of_property_read_u32(pdev->dev.of_node, "reg",
+ &pon->baseaddr);
+ if (error)
+ return error;
+
+ reason_shift = (long)of_device_get_match_data(&pdev->dev);
+
+ if (reason_shift != NO_REASON_SHIFT) {
+ pon->reboot_mode.dev = &pdev->dev;
+ pon->reason_shift = reason_shift;
+ pon->reboot_mode.write = pm8916_reboot_mode_write;
+ error = devm_reboot_mode_register(&pdev->dev, &pon->reboot_mode);
+ if (error) {
+ dev_err(&pdev->dev, "can't register reboot mode\n");
+ return error;
+ }
+ }
+
+ platform_set_drvdata(pdev, pon);
+
+ return devm_of_platform_populate(&pdev->dev);
+}
+
+static const struct of_device_id pm8916_pon_id_table[] = {
+ { .compatible = "qcom,pm8916-pon", .data = (void *)GEN1_REASON_SHIFT },
+ { .compatible = "qcom,pm8941-pon", .data = (void *)NO_REASON_SHIFT },
+ { .compatible = "qcom,pms405-pon", .data = (void *)GEN1_REASON_SHIFT },
+ { .compatible = "qcom,pm8998-pon", .data = (void *)GEN2_REASON_SHIFT },
+ { .compatible = "qcom,pmk8350-pon", .data = (void *)GEN2_REASON_SHIFT },
+ { }
+};
+MODULE_DEVICE_TABLE(of, pm8916_pon_id_table);
+
+static struct platform_driver pm8916_pon_driver = {
+ .probe = pm8916_pon_probe,
+ .driver = {
+ .name = "pm8916-pon",
+ .of_match_table = pm8916_pon_id_table,
+ },
+};
+module_platform_driver(pm8916_pon_driver);
+
+MODULE_DESCRIPTION("pm8916 Power On driver");
+MODULE_LICENSE("GPL v2");