1 files changed, 133 insertions, 0 deletions

diff --git a/drivers/reset/reset-qcom-aoss.c b/drivers/reset/reset-qcom-aoss.c
new file mode 100644
index 000000000000..36db96750450
--- /dev/null
+++ b/drivers/reset/reset-qcom-aoss.c
@@ -0,0 +1,133 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/reset-controller.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/of_device.h>
+#include <dt-bindings/reset/qcom,sdm845-aoss.h>
+
+struct qcom_aoss_reset_map {
+        unsigned int reg;
+};
+
+struct qcom_aoss_desc {
+        const struct qcom_aoss_reset_map *resets;
+        size_t num_resets;
+};
+
+struct qcom_aoss_reset_data {
+        struct reset_controller_dev rcdev;
+        void __iomem *base;
+        const struct qcom_aoss_desc *desc;
+};
+
+static const struct qcom_aoss_reset_map sdm845_aoss_resets[] = {
+        [AOSS_CC_MSS_RESTART] = {0x10000},
+        [AOSS_CC_CAMSS_RESTART] = {0x11000},
+        [AOSS_CC_VENUS_RESTART] = {0x12000},
+        [AOSS_CC_GPU_RESTART] = {0x13000},
+        [AOSS_CC_DISPSS_RESTART] = {0x14000},
+        [AOSS_CC_WCSS_RESTART] = {0x20000},
+        [AOSS_CC_LPASS_RESTART] = {0x30000},
+};
+
+static const struct qcom_aoss_desc sdm845_aoss_desc = {
+        .resets = sdm845_aoss_resets,
+        .num_resets = ARRAY_SIZE(sdm845_aoss_resets),
+};
+
+static inline struct qcom_aoss_reset_data *to_qcom_aoss_reset_data(
+                                struct reset_controller_dev *rcdev)
+{
+        return container_of(rcdev, struct qcom_aoss_reset_data, rcdev);
+}
+
+static int qcom_aoss_control_assert(struct reset_controller_dev *rcdev,
+                                    unsigned long idx)
+{
+        struct qcom_aoss_reset_data *data = to_qcom_aoss_reset_data(rcdev);
+        const struct qcom_aoss_reset_map *map = &data->desc->resets[idx];
+
+        writel(1, data->base + map->reg);
+        /* Wait 6 32kHz sleep cycles for reset */
+        usleep_range(200, 300);
+        return 0;
+}
+
+static int qcom_aoss_control_deassert(struct reset_controller_dev *rcdev,
+                                      unsigned long idx)
+{
+        struct qcom_aoss_reset_data *data = to_qcom_aoss_reset_data(rcdev);
+        const struct qcom_aoss_reset_map *map = &data->desc->resets[idx];
+
+        writel(0, data->base + map->reg);
+        /* Wait 6 32kHz sleep cycles for reset */
+        usleep_range(200, 300);
+        return 0;
+}
+
+static int qcom_aoss_control_reset(struct reset_controller_dev *rcdev,
+                                        unsigned long idx)
+{
+        qcom_aoss_control_assert(rcdev, idx);
+
+        return qcom_aoss_control_deassert(rcdev, idx);
+}
+
+static const struct reset_control_ops qcom_aoss_reset_ops = {
+        .reset = qcom_aoss_control_reset,
+        .assert = qcom_aoss_control_assert,
+        .deassert = qcom_aoss_control_deassert,
+};
+
+static int qcom_aoss_reset_probe(struct platform_device *pdev)
+{
+        struct qcom_aoss_reset_data *data;
+        struct device *dev = &pdev->dev;
+        const struct qcom_aoss_desc *desc;
+        struct resource *res;
+
+        desc = of_device_get_match_data(dev);
+        if (!desc)
+                return -EINVAL;
+
+        data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+        if (!data)
+                return -ENOMEM;
+
+        data->desc = desc;
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        data->base = devm_ioremap_resource(dev, res);
+        if (IS_ERR(data->base))
+                return PTR_ERR(data->base);
+
+        data->rcdev.owner = THIS_MODULE;
+        data->rcdev.ops = &qcom_aoss_reset_ops;
+        data->rcdev.nr_resets = desc->num_resets;
+        data->rcdev.of_node = dev->of_node;
+
+        return devm_reset_controller_register(dev, &data->rcdev);
+}
+
+static const struct of_device_id qcom_aoss_reset_of_match[] = {
+        { .compatible = "qcom,sdm845-aoss-cc", .data = &sdm845_aoss_desc },
+        {}
+};
+
+static struct platform_driver qcom_aoss_reset_driver = {
+        .probe = qcom_aoss_reset_probe,
+        .driver  = {
+                .name = "qcom_aoss_reset",
+                .of_match_table = qcom_aoss_reset_of_match,
+        },
+};
+
+builtin_platform_driver(qcom_aoss_reset_driver);
+
+MODULE_DESCRIPTION("Qualcomm AOSS Reset Driver");
+MODULE_LICENSE("GPL v2");