power: reset: qcom-pon: Add Qcom PON driver

Add support Qualcomm PM8xxx PON which is responsible for reboot
mode support.

Co-developed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>

diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
index df58fc878b3e5278394a9b9e2fdc135f3353817e..6533aa560aa1fb6a87eeb15399c9e37e86945fbe 100644 (file)
--- a/drivers/power/reset/Kconfig
+++ b/drivers/power/reset/Kconfig
@@ -104,6 +104,17 @@ config POWER_RESET_MSM
        help
          Power off and restart support for Qualcomm boards.
 
+config POWER_RESET_QCOM_PON
+       tristate "Qualcomm power-on driver"
+       depends on ARCH_QCOM
+       depends on MFD_SPMI_PMIC
+       select REBOOT_MODE
+       help
+         Power On support for Qualcomm boards.
+         If you have a Qualcomm platform and need support for
+         power-on and reboot reason, Say Y.
+         If unsure, Say N.
+
 config POWER_RESET_OCELOT_RESET
        bool "Microsemi Ocelot reset driver"
        depends on MSCC_OCELOT || COMPILE_TEST

diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
index 7778c7485cf19b44b1ccd84fa5e6b738d5866faf..0aebee954ac1bfb6f1775a341a564a470125ed5e 100644 (file)
--- a/drivers/power/reset/Makefile
+++ b/drivers/power/reset/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o
 obj-$(CONFIG_POWER_RESET_GPIO_RESTART) += gpio-restart.o
 obj-$(CONFIG_POWER_RESET_HISI) += hisi-reboot.o
 obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o
+obj-$(CONFIG_POWER_RESET_QCOM_PON) += qcom-pon.o
 obj-$(CONFIG_POWER_RESET_OCELOT_RESET) += ocelot-reset.o
 obj-$(CONFIG_POWER_RESET_PIIX4_POWEROFF) += piix4-poweroff.o
 obj-$(CONFIG_POWER_RESET_LTC2952) += ltc2952-poweroff.o

diff --git a/drivers/power/reset/qcom-pon.c b/drivers/power/reset/qcom-pon.c
new file mode 100644 (file)
index 0000000..0c4caaa
--- /dev/null
+++ b/drivers/power/reset/qcom-pon.c
@@ -0,0 +1,91 @@
+// 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
+
+struct pm8916_pon {
+       struct device *dev;
+       struct regmap *regmap;
+       u32 baseaddr;
+       struct reboot_mode_driver reboot_mode;
+};
+
+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,
+                                0xfc, magic << 2);
+       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;
+       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;
+
+       pon->reboot_mode.dev = &pdev->dev;
+       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" },
+       { }
+};
+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 = of_match_ptr(pm8916_pon_id_table),
+       },
+};
+module_platform_driver(pm8916_pon_driver);
+
+MODULE_DESCRIPTION("pm8916 Power On driver");
+MODULE_LICENSE("GPL v2");