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authorEugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>2017-09-14 17:28:42 +0300
committerPhilipp Zabel <p.zabel@pengutronix.de>2017-09-18 18:41:27 +0200
commit376349232a93645624426db782cafe688054e6d6 (patch)
treee5ea4b109e292007b1c336f95fd61395a7d3eb84 /drivers/reset
parent2bd6bf03f4c1c59381d62c61d03f6cc3fe71f66e (diff)
ARC: reset: introduce AXS10x reset driver
ARC AXS10x boards support custom IP-block which allows to control reset signals of selected peripherals. For example DW GMAC, etc... This block is controlled via memory-mapped register (AKA CREG) which represents up-to 32 reset lines. This regiter is self-clearing so we don't need to deassert line after reset. As of today only the following lines are used: - DW GMAC - line 5 Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Diffstat (limited to 'drivers/reset')
-rw-r--r--drivers/reset/Kconfig6
-rw-r--r--drivers/reset/Makefile1
-rw-r--r--drivers/reset/reset-axs10x.c83
3 files changed, 90 insertions, 0 deletions
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index e0c393214264..23ec43f99d9a 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -28,6 +28,12 @@ config RESET_ATH79
This enables the ATH79 reset controller driver that supports the
AR71xx SoC reset controller.
+config RESET_AXS10X
+ bool "AXS10x Reset Driver" if COMPILE_TEST
+ default ARC_PLAT_AXS10X
+ help
+ This enables the reset controller driver for AXS10x.
+
config RESET_BERLIN
bool "Berlin Reset Driver" if COMPILE_TEST
default ARCH_BERLIN
diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index d368367110e5..7579dba7b185 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -4,6 +4,7 @@ obj-$(CONFIG_ARCH_STI) += sti/
obj-$(CONFIG_ARCH_TEGRA) += tegra/
obj-$(CONFIG_RESET_A10SR) += reset-a10sr.o
obj-$(CONFIG_RESET_ATH79) += reset-ath79.o
+obj-$(CONFIG_RESET_AXS10X) += reset-axs10x.o
obj-$(CONFIG_RESET_BERLIN) += reset-berlin.o
obj-$(CONFIG_RESET_HSDK_V1) += reset-hsdk-v1.o
obj-$(CONFIG_RESET_IMX7) += reset-imx7.o
diff --git a/drivers/reset/reset-axs10x.c b/drivers/reset/reset-axs10x.c
new file mode 100644
index 000000000000..afb298e46bd9
--- /dev/null
+++ b/drivers/reset/reset-axs10x.c
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2017 Synopsys.
+ *
+ * Synopsys AXS10x reset driver.
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/reset-controller.h>
+
+#define to_axs10x_rst(p) container_of((p), struct axs10x_rst, rcdev)
+
+#define AXS10X_MAX_RESETS 32
+
+struct axs10x_rst {
+ void __iomem *regs_rst;
+ spinlock_t lock;
+ struct reset_controller_dev rcdev;
+};
+
+static int axs10x_reset_reset(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct axs10x_rst *rst = to_axs10x_rst(rcdev);
+ unsigned long flags;
+
+ spin_lock_irqsave(&rst->lock, flags);
+ writel(BIT(id), rst->regs_rst);
+ spin_unlock_irqrestore(&rst->lock, flags);
+
+ return 0;
+}
+
+static const struct reset_control_ops axs10x_reset_ops = {
+ .reset = axs10x_reset_reset,
+};
+
+static int axs10x_reset_probe(struct platform_device *pdev)
+{
+ struct axs10x_rst *rst;
+ struct resource *mem;
+
+ rst = devm_kzalloc(&pdev->dev, sizeof(*rst), GFP_KERNEL);
+ if (!rst)
+ return -ENOMEM;
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ rst->regs_rst = devm_ioremap_resource(&pdev->dev, mem);
+ if (IS_ERR(rst->regs_rst))
+ return PTR_ERR(rst->regs_rst);
+
+ spin_lock_init(&rst->lock);
+
+ rst->rcdev.owner = THIS_MODULE;
+ rst->rcdev.ops = &axs10x_reset_ops;
+ rst->rcdev.of_node = pdev->dev.of_node;
+ rst->rcdev.nr_resets = AXS10X_MAX_RESETS;
+
+ return devm_reset_controller_register(&pdev->dev, &rst->rcdev);
+}
+
+static const struct of_device_id axs10x_reset_dt_match[] = {
+ { .compatible = "snps,axs10x-reset" },
+ { },
+};
+
+static struct platform_driver axs10x_reset_driver = {
+ .probe = axs10x_reset_probe,
+ .driver = {
+ .name = "axs10x-reset",
+ .of_match_table = axs10x_reset_dt_match,
+ },
+};
+builtin_platform_driver(axs10x_reset_driver);
+
+MODULE_AUTHOR("Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>");
+MODULE_DESCRIPTION("Synopsys AXS10x reset driver");
+MODULE_LICENSE("GPL v2");

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