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Subject[RFC 10/11] reset: imx: Add audiomix reset controller support
Date
The imx-mix MFD driver registers some devices, one of which, in case of
audiomix, maps correctly to a reset controller type. This driver registers
a reset controller for that. For now, only the EARC specific resets are added.

Signed-off-by: Abel Vesa <abel.vesa@nxp.com>
Reviewed-by: Leonard Crestez <leonard.crestez@nxp.com>
---
drivers/reset/Kconfig | 7 ++
drivers/reset/Makefile | 1 +
drivers/reset/reset-imx-audiomix.c | 122 +++++++++++++++++++++++++
include/dt-bindings/reset/imx-audiomix-reset.h | 15 +++
4 files changed, 145 insertions(+)
create mode 100644 drivers/reset/reset-imx-audiomix.c
create mode 100644 include/dt-bindings/reset/imx-audiomix-reset.h

diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index d9efbfd..2f8d9b3 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -81,6 +81,13 @@ config RESET_INTEL_GW
Say Y to control the reset signals provided by reset controller.
Otherwise, say N.

+config RESET_IMX_AUDIOMIX
+ bool "i.MX Audiomix Reset Driver" if COMPILE_TEST
+ depends on HAS_IOMEM
+ default ARCH_MXC
+ help
+ This enables the audiomix reset controller driver for i.MX SoCs.
+
config RESET_LANTIQ
bool "Lantiq XWAY Reset Driver" if COMPILE_TEST
default SOC_TYPE_XWAY
diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index 249ed35..cf23d38 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_RESET_BRCMSTB_RESCAL) += reset-brcmstb-rescal.o
obj-$(CONFIG_RESET_HSDK) += reset-hsdk.o
obj-$(CONFIG_RESET_IMX7) += reset-imx7.o
obj-$(CONFIG_RESET_INTEL_GW) += reset-intel-gw.o
+obj-$(CONFIG_RESET_IMX_AUDIOMIX) += reset-imx-audiomix.o
obj-$(CONFIG_RESET_LANTIQ) += reset-lantiq.o
obj-$(CONFIG_RESET_LPC18XX) += reset-lpc18xx.o
obj-$(CONFIG_RESET_MESON) += reset-meson.o
diff --git a/drivers/reset/reset-imx-audiomix.c b/drivers/reset/reset-imx-audiomix.c
new file mode 100644
index 00000000..d1c62ef
--- /dev/null
+++ b/drivers/reset/reset-imx-audiomix.c
@@ -0,0 +1,122 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 NXP.
+ */
+
+#include <dt-bindings/reset/imx-audiomix-reset.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/reset-controller.h>
+
+#define IMX_AUDIOMIX_EARC_CTRL_REG 0x200
+
+#define IMX_AUDIOMIX_EARC_RESET_BIT 0x0
+#define IMX_AUDIOMIX_EARC_PHY_RESET_BIT 0x1
+
+struct imx_audiomix_reset_data {
+ void __iomem *base;
+ struct reset_controller_dev rcdev;
+ spinlock_t lock;
+};
+
+static int imx_audiomix_reset_set(struct reset_controller_dev *rcdev,
+ unsigned long id, bool assert)
+{
+ struct imx_audiomix_reset_data *drvdata = container_of(rcdev,
+ struct imx_audiomix_reset_data, rcdev);
+ void __iomem *reg_addr = drvdata->base;
+ unsigned long flags;
+ unsigned int offset;
+ u32 reg;
+
+ switch (id) {
+ case IMX_AUDIOMIX_EARC_PHY_RESET:
+ reg_addr += IMX_AUDIOMIX_EARC_CTRL_REG;
+ offset = IMX_AUDIOMIX_EARC_PHY_RESET_BIT;
+ break;
+ case IMX_AUDIOMIX_EARC_RESET:
+ reg_addr += IMX_AUDIOMIX_EARC_CTRL_REG;
+ offset = IMX_AUDIOMIX_EARC_RESET_BIT;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (assert) {
+ pm_runtime_get_sync(rcdev->dev);
+ spin_lock_irqsave(&drvdata->lock, flags);
+ reg = readl(reg_addr);
+ writel(reg & ~BIT(offset), reg_addr);
+ spin_unlock_irqrestore(&drvdata->lock, flags);
+ } else {
+ spin_lock_irqsave(&drvdata->lock, flags);
+ reg = readl(reg_addr);
+ writel(reg | BIT(offset), reg_addr);
+ spin_unlock_irqrestore(&drvdata->lock, flags);
+ pm_runtime_put(rcdev->dev);
+ }
+
+ return 0;
+}
+
+static int imx_audiomix_reset_assert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ return imx_audiomix_reset_set(rcdev, id, true);
+}
+
+static int imx_audiomix_reset_deassert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ return imx_audiomix_reset_set(rcdev, id, false);
+}
+
+static const struct reset_control_ops imx_audiomix_reset_ops = {
+ .assert = imx_audiomix_reset_assert,
+ .deassert = imx_audiomix_reset_deassert,
+};
+
+static int imx_audiomix_reset_probe(struct platform_device *pdev)
+{
+ struct imx_audiomix_reset_data *drvdata;
+ struct device *dev = &pdev->dev;
+
+ drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
+ if (drvdata == NULL)
+ return -ENOMEM;
+
+ drvdata->base = dev_get_drvdata(dev->parent);
+
+ platform_set_drvdata(pdev, drvdata);
+
+ pm_runtime_enable(dev);
+
+ spin_lock_init(&drvdata->lock);
+
+ drvdata->rcdev.owner = THIS_MODULE;
+ drvdata->rcdev.nr_resets = IMX_AUDIOMIX_RESET_NUM;
+ drvdata->rcdev.ops = &imx_audiomix_reset_ops;
+ drvdata->rcdev.of_node = dev->of_node;
+ drvdata->rcdev.dev = dev;
+
+ return devm_reset_controller_register(dev, &drvdata->rcdev);
+}
+
+static const struct of_device_id imx_audiomix_reset_dt_ids[] = {
+ { .compatible = "fsl,imx8mp-audiomix-reset", },
+ { /* sentinel */ },
+};
+
+static struct platform_driver imx_audiomix_reset_driver = {
+ .probe = imx_audiomix_reset_probe,
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .of_match_table = imx_audiomix_reset_dt_ids,
+ },
+};
+module_platform_driver(imx_audiomix_reset_driver);
diff --git a/include/dt-bindings/reset/imx-audiomix-reset.h b/include/dt-bindings/reset/imx-audiomix-reset.h
new file mode 100644
index 00000000..2e26878
--- /dev/null
+++ b/include/dt-bindings/reset/imx-audiomix-reset.h
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 NXP.
+ */
+
+#ifndef DT_BINDING_RESET_IMX_AUDIOMIX_H
+#define DT_BINDING_RESET_IMX_AUDIOMIX_H
+
+#define IMX_AUDIOMIX_EARC_RESET 0x0
+#define IMX_AUDIOMIX_EARC_PHY_RESET 0x1
+
+#define IMX_AUDIOMIX_RESET_NUM 2
+
+#endif
+
--
2.7.4
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