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Message-ID: <1415005371-4323-2-git-send-email-flora.fu@mediatek.com>
Date: Mon, 3 Nov 2014 17:02:49 +0800
From: Flora Fu <flora.fu@...iatek.com>
To: Philipp Zabel <p.zabel@...gutronix.de>,
Rob Herring <robh+dt@...nel.org>,
Matthias Brugger <matthias.bgg@...il.com>, <arm@...nel.org>
CC: Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Russell King <linux@....linux.org.uk>,
Grant Likely <grant.likely@...aro.org>,
<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<srv_heupstream@...iatek.com>,
Sascha Hauer <kernel@...gutronix.de>,
Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
Flora Fu <flora.fu@...iatek.com>
Subject: [PATCH v2 1/3] ARM: mediatek: Add Reset Controller for MediaTek SoC
Add a driver in reset controller.
Signed-off-by: Flora Fu <flora.fu@...iatek.com>
---
drivers/reset/Makefile | 1 +
drivers/reset/reset-mtk.c | 131 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 132 insertions(+)
create mode 100644 drivers/reset/reset-mtk.c
diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index 60fed3d..adcebdf 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_RESET_CONTROLLER) += core.o
obj-$(CONFIG_ARCH_SOCFPGA) += reset-socfpga.o
obj-$(CONFIG_ARCH_SUNXI) += reset-sunxi.o
obj-$(CONFIG_ARCH_STI) += sti/
+obj-$(CONFIG_ARCH_MEDIATEK) += reset-mtk.o
diff --git a/drivers/reset/reset-mtk.c b/drivers/reset/reset-mtk.c
new file mode 100644
index 0000000..7d792ec
--- /dev/null
+++ b/drivers/reset/reset-mtk.c
@@ -0,0 +1,131 @@
+/*
+ * Copyright (c) 2014 MediaTek Inc.
+ * Author: Flora.Fu <flora.fu@...iatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/reset-controller.h>
+
+struct mtk_reset_data {
+ struct regmap *regmap;
+ u32 resetbase;
+ u32 num_regs;
+ struct reset_controller_dev rcdev;
+};
+
+static int mtk_reset_assert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct regmap *regmap;
+ u32 addr;
+ u32 mask;
+ struct mtk_reset_data *data = container_of(rcdev,
+ struct mtk_reset_data,
+ rcdev);
+ regmap = data->regmap;
+ addr = data->resetbase + ((id / 32) << 2);
+ mask = BIT(id % 32);
+
+ return regmap_update_bits(regmap, addr, mask, mask);
+}
+
+static int mtk_reset_deassert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct regmap *regmap;
+ u32 addr;
+ u32 mask;
+ struct mtk_reset_data *data = container_of(rcdev,
+ struct mtk_reset_data,
+ rcdev);
+
+ regmap = data->regmap;
+ addr = data->resetbase + ((id / 32) << 2);
+ mask = BIT(id % 32);
+
+ return regmap_update_bits(regmap, addr, mask, ~mask);
+}
+
+static struct reset_control_ops mtk_reset_ops = {
+ .assert = mtk_reset_assert,
+ .deassert = mtk_reset_deassert,
+};
+
+static int mtk_reset_probe(struct platform_device *pdev)
+{
+ struct mtk_reset_data *data;
+ struct device_node *np = pdev->dev.of_node;
+ struct device_node *syscon_np;
+ u32 reg[2];
+ int ret;
+
+ data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ syscon_np = of_get_parent(np);
+ data->regmap = syscon_node_to_regmap(syscon_np);
+ of_node_put(syscon_np);
+ if (IS_ERR(data->regmap)) {
+ dev_err(&pdev->dev, "couldn't get syscon-reset regmap\n");
+ return PTR_ERR(data->regmap);
+ }
+ ret = of_property_read_u32_array(np, "reg", reg, 2);
+ if (ret) {
+ dev_err(&pdev->dev, "couldn't read reset base from syscon!\n");
+ return -EINVAL;
+ }
+
+ data->resetbase = reg[0];
+ data->num_regs = reg[1] >> 2;
+ data->rcdev.owner = THIS_MODULE;
+ data->rcdev.nr_resets = data->num_regs * 32;
+ data->rcdev.ops = &mtk_reset_ops;
+ data->rcdev.of_node = pdev->dev.of_node;
+
+ return reset_controller_register(&data->rcdev);
+}
+
+static int mtk_reset_remove(struct platform_device *pdev)
+{
+ struct mtk_reset_data *data = platform_get_drvdata(pdev);
+
+ reset_controller_unregister(&data->rcdev);
+
+ return 0;
+}
+
+static const struct of_device_id mtk_reset_dt_ids[] = {
+ { .compatible = "mediatek,reset", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, mtk_reset_dt_ids);
+
+static struct platform_driver mtk_reset_driver = {
+ .probe = mtk_reset_probe,
+ .remove = mtk_reset_remove,
+ .driver = {
+ .name = "mtk-reset",
+ .owner = THIS_MODULE,
+ .of_match_table = mtk_reset_dt_ids,
+ },
+};
+
+module_platform_driver(mtk_reset_driver);
+
+MODULE_AUTHOR("Flora Fu <flora.fu@...iatek.com>");
+MODULE_DESCRIPTION("MediaTek SoC Generic Reset Controller");
+MODULE_LICENSE("GPL");
--
1.8.1.1.dirty
--
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