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path: root/drivers/reset/reset-uniphier-usb3.c
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Diffstat (limited to 'drivers/reset/reset-uniphier-usb3.c')
-rw-r--r--drivers/reset/reset-uniphier-usb3.c171
1 files changed, 171 insertions, 0 deletions
diff --git a/drivers/reset/reset-uniphier-usb3.c b/drivers/reset/reset-uniphier-usb3.c
new file mode 100644
index 000000000000..ffa1b19b594d
--- /dev/null
+++ b/drivers/reset/reset-uniphier-usb3.c
@@ -0,0 +1,171 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// reset-uniphier-usb3.c - USB3 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_usb3_reset_soc_data {
+ int nclks;
+ const char * const *clock_names;
+ int nrsts;
+ const char * const *reset_names;
+};
+
+struct uniphier_usb3_reset_priv {
+ struct clk_bulk_data clk[MAX_CLKS];
+ struct reset_control *rst[MAX_RSTS];
+ struct reset_simple_data rdata;
+ const struct uniphier_usb3_reset_soc_data *data;
+};
+
+static int uniphier_usb3_reset_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct uniphier_usb3_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_usb3_reset_remove(struct platform_device *pdev)
+{
+ struct uniphier_usb3_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_usb3_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_usb3_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_usb3_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,
+ },
+ { /* Sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, uniphier_usb3_reset_match);
+
+static struct platform_driver uniphier_usb3_reset_driver = {
+ .probe = uniphier_usb3_reset_probe,
+ .remove = uniphier_usb3_reset_remove,
+ .driver = {
+ .name = "uniphier-usb3-reset",
+ .of_match_table = uniphier_usb3_reset_match,
+ },
+};
+module_platform_driver(uniphier_usb3_reset_driver);
+
+MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>");
+MODULE_DESCRIPTION("UniPhier USB3 Reset Driver");
+MODULE_LICENSE("GPL");