1 files changed, 183 insertions, 0 deletions

diff --git a/drivers/reset/reset-uniphier-glue.c b/drivers/reset/reset-uniphier-glue.c
new file mode 100644
index 000000000000..a45923f4df6d
--- /dev/null
+++ b/drivers/reset/reset-uniphier-glue.c
@@ -0,0 +1,183 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// reset-uniphier-glue.c - Glue layer reset driver for UniPhier
+// Copyright 2018 Socionext Inc.
+// Author: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
+
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+
+#include "reset-simple.h"
+
+#define MAX_CLKS        2
+#define MAX_RSTS        2
+
+struct uniphier_glue_reset_soc_data {
+        int nclks;
+        const char * const *clock_names;
+        int nrsts;
+        const char * const *reset_names;
+};
+
+struct uniphier_glue_reset_priv {
+        struct clk_bulk_data clk[MAX_CLKS];
+        struct reset_control *rst[MAX_RSTS];
+        struct reset_simple_data rdata;
+        const struct uniphier_glue_reset_soc_data *data;
+};
+
+static int uniphier_glue_reset_probe(struct platform_device *pdev)
+{
+        struct device *dev = &pdev->dev;
+        struct uniphier_glue_reset_priv *priv;
+        struct resource *res;
+        resource_size_t size;
+        const char *name;
+        int i, ret, nr;
+
+        priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+        if (!priv)
+                return -ENOMEM;
+
+        priv->data = of_device_get_match_data(dev);
+        if (WARN_ON(!priv->data || priv->data->nclks > MAX_CLKS ||
+                    priv->data->nrsts > MAX_RSTS))
+                return -EINVAL;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        size = resource_size(res);
+        priv->rdata.membase = devm_ioremap_resource(dev, res);
+        if (IS_ERR(priv->rdata.membase))
+                return PTR_ERR(priv->rdata.membase);
+
+        for (i = 0; i < priv->data->nclks; i++)
+                priv->clk[i].id = priv->data->clock_names[i];
+        ret = devm_clk_bulk_get(dev, priv->data->nclks, priv->clk);
+        if (ret)
+                return ret;
+
+        for (i = 0; i < priv->data->nrsts; i++) {
+                name = priv->data->reset_names[i];
+                priv->rst[i] = devm_reset_control_get_shared(dev, name);
+                if (IS_ERR(priv->rst[i]))
+                        return PTR_ERR(priv->rst[i]);
+        }
+
+        ret = clk_bulk_prepare_enable(priv->data->nclks, priv->clk);
+        if (ret)
+                return ret;
+
+        for (nr = 0; nr < priv->data->nrsts; nr++) {
+                ret = reset_control_deassert(priv->rst[nr]);
+                if (ret)
+                        goto out_rst_assert;
+        }
+
+        spin_lock_init(&priv->rdata.lock);
+        priv->rdata.rcdev.owner = THIS_MODULE;
+        priv->rdata.rcdev.nr_resets = size * BITS_PER_BYTE;
+        priv->rdata.rcdev.ops = &reset_simple_ops;
+        priv->rdata.rcdev.of_node = dev->of_node;
+        priv->rdata.active_low = true;
+
+        platform_set_drvdata(pdev, priv);
+
+        ret = devm_reset_controller_register(dev, &priv->rdata.rcdev);
+        if (ret)
+                goto out_rst_assert;
+
+        return 0;
+
+out_rst_assert:
+        while (nr--)
+                reset_control_assert(priv->rst[nr]);
+
+        clk_bulk_disable_unprepare(priv->data->nclks, priv->clk);
+
+        return ret;
+}
+
+static int uniphier_glue_reset_remove(struct platform_device *pdev)
+{
+        struct uniphier_glue_reset_priv *priv = platform_get_drvdata(pdev);
+        int i;
+
+        for (i = 0; i < priv->data->nrsts; i++)
+                reset_control_assert(priv->rst[i]);
+
+        clk_bulk_disable_unprepare(priv->data->nclks, priv->clk);
+
+        return 0;
+}
+
+static const char * const uniphier_pro4_clock_reset_names[] = {
+        "gio", "link",
+};
+
+static const struct uniphier_glue_reset_soc_data uniphier_pro4_data = {
+        .nclks = ARRAY_SIZE(uniphier_pro4_clock_reset_names),
+        .clock_names = uniphier_pro4_clock_reset_names,
+        .nrsts = ARRAY_SIZE(uniphier_pro4_clock_reset_names),
+        .reset_names = uniphier_pro4_clock_reset_names,
+};
+
+static const char * const uniphier_pxs2_clock_reset_names[] = {
+        "link",
+};
+
+static const struct uniphier_glue_reset_soc_data uniphier_pxs2_data = {
+        .nclks = ARRAY_SIZE(uniphier_pxs2_clock_reset_names),
+        .clock_names = uniphier_pxs2_clock_reset_names,
+        .nrsts = ARRAY_SIZE(uniphier_pxs2_clock_reset_names),
+        .reset_names = uniphier_pxs2_clock_reset_names,
+};
+
+static const struct of_device_id uniphier_glue_reset_match[] = {
+        {
+                .compatible = "socionext,uniphier-pro4-usb3-reset",
+                .data = &uniphier_pro4_data,
+        },
+        {
+                .compatible = "socionext,uniphier-pxs2-usb3-reset",
+                .data = &uniphier_pxs2_data,
+        },
+        {
+                .compatible = "socionext,uniphier-ld20-usb3-reset",
+                .data = &uniphier_pxs2_data,
+        },
+        {
+                .compatible = "socionext,uniphier-pxs3-usb3-reset",
+                .data = &uniphier_pxs2_data,
+        },
+        {
+                .compatible = "socionext,uniphier-pro4-ahci-reset",
+                .data = &uniphier_pro4_data,
+        },
+        {
+                .compatible = "socionext,uniphier-pxs2-ahci-reset",
+                .data = &uniphier_pxs2_data,
+        },
+        {
+                .compatible = "socionext,uniphier-pxs3-ahci-reset",
+                .data = &uniphier_pxs2_data,
+        },
+        { /* Sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, uniphier_glue_reset_match);
+
+static struct platform_driver uniphier_glue_reset_driver = {
+        .probe = uniphier_glue_reset_probe,
+        .remove = uniphier_glue_reset_remove,
+        .driver = {
+                .name = "uniphier-glue-reset",
+                .of_match_table = uniphier_glue_reset_match,
+        },
+};
+module_platform_driver(uniphier_glue_reset_driver);
+
+MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>");
+MODULE_DESCRIPTION("UniPhier Glue layer reset driver");
+MODULE_LICENSE("GPL");