[PATCH 1/6] reset: qcom: AOSS (Always on subsystem) reset controller
From: sibis
Date: Mon Mar 05 2018 - 04:55:47 EST
Add reset controller driver for Qualcomm SDM845 SoC to
control reset signals provided by AOSS for Modem, Venus
ADSP, GPU, Camera, Wireless, Display subsystem
Signed-off-by: sibis <sibis@xxxxxxxxxxxxxx>
---
.../devicetree/bindings/reset/qcom,aoss-reset.txt | 54 ++++++++
drivers/reset/Kconfig | 10 ++
drivers/reset/Makefile | 1 +
drivers/reset/reset-qcom-aoss.c | 151 +++++++++++++++++++++
include/dt-bindings/reset/qcom,aoss-sdm845.h | 17 +++
5 files changed, 233 insertions(+)
create mode 100644 Documentation/devicetree/bindings/reset/qcom,aoss-reset.txt
create mode 100644 drivers/reset/reset-qcom-aoss.c
create mode 100644 include/dt-bindings/reset/qcom,aoss-sdm845.h
diff --git a/Documentation/devicetree/bindings/reset/qcom,aoss-reset.txt b/Documentation/devicetree/bindings/reset/qcom,aoss-reset.txt
new file mode 100644
index 0000000..5318e14
--- /dev/null
+++ b/Documentation/devicetree/bindings/reset/qcom,aoss-reset.txt
@@ -0,0 +1,54 @@
+Qualcomm AOSS Reset Controller
+======================================
+
+This binding describes a reset-controller found on AOSS (Always on SubSysem)
+for Qualcomm SDM845 SoCs.
+
+Required properties:
+- compatible:
+ Usage: required
+ Value type: <string>
+ Definition: must be:
+ "qcom,aoss-reset-sdm845", "syscon"
+
+- reg:
+ Usage: required
+ Value type: <prop-encoded-array>
+ Definition: must specify the base address and size of the
+ syscon device.
+
+
+- #reset-cells:
+ Usage: required
+ Value type: <uint>
+ Definition: must be 1; cell entry represents the reset index.
+
+example:
+
+aoss_reset: qcom,reset-controller@b2e0100 {
+ compatible = "qcom,aoss-reset-sdm845", "syscon";
+ reg = <0xc2b0000 0x20004>;
+ #reset-cells = <1>;
+};
+
+
+Specifying reset lines connected to IP modules
+==============================================
+
+Device nodes that need access to reset lines should
+specify them as a reset phandle in their corresponding node as
+specified in reset.txt.
+
+Example:
+
+ modem-pil@4080000 {
+ ...
+
+ resets = <&aoss_reset AOSS_CC_MSS_RESTART>;
+ reset-names = "mss_restart";
+
+ ...
+ };
+
+For list of all valid reset indicies see
+<dt-bindings/reset/qcom,aoss-sdm845.h>
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index 7fc7769..1141733 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -81,6 +81,16 @@ config RESET_PISTACHIO
help
This enables the reset driver for ImgTec Pistachio SoCs.
+config RESET_QCOM_AOSS
+ bool "Qcom AOSS Reset Driver"
+ depends on ARCH_QCOM || COMPILE_TEST
+ select MFD_SYSCON
+ help
+ This enables the AOSS (Always On SubSystem) reset driver
+ for Qualcomm SDM845 SoCs. Say Y if you want to control
+ reset signals provided by AOSS for Modem, Venus, ADSP,
+ GPU, Camera, Wireless, Display subsystem. Otherwise, say N.
+
config RESET_SIMPLE
bool "Simple Reset Controller Driver" if COMPILE_TEST
default ARCH_SOCFPGA || ARCH_STM32 || ARCH_STRATIX10 || ARCH_SUNXI || ARCH_ZX
diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index 132c24f..c30044a 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_RESET_LPC18XX) += reset-lpc18xx.o
obj-$(CONFIG_RESET_MESON) += reset-meson.o
obj-$(CONFIG_RESET_OXNAS) += reset-oxnas.o
obj-$(CONFIG_RESET_PISTACHIO) += reset-pistachio.o
+obj-$(CONFIG_RESET_QCOM_AOSS) += reset-qcom-aoss.o
obj-$(CONFIG_RESET_SIMPLE) += reset-simple.o
obj-$(CONFIG_RESET_SUNXI) += reset-sunxi.o
obj-$(CONFIG_RESET_TI_SCI) += reset-ti-sci.o
diff --git a/drivers/reset/reset-qcom-aoss.c b/drivers/reset/reset-qcom-aoss.c
new file mode 100644
index 0000000..1f3e3e8
--- /dev/null
+++ b/drivers/reset/reset-qcom-aoss.c
@@ -0,0 +1,151 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/reset-controller.h>
+#include <linux/regmap.h>
+#include <linux/of_device.h>
+#include <dt-bindings/reset/qcom,aoss-sdm845.h>
+
+struct qcom_aoss_reset_map {
+ unsigned int reg;
+ u8 bit;
+};
+
+struct qcom_aoss_desc {
+ const struct regmap_config *config;
+ const struct qcom_aoss_reset_map *resets;
+ int delay;
+ size_t num_resets;
+};
+
+struct qcom_aoss_reset_data {
+ struct reset_controller_dev rcdev;
+ struct regmap *regmap;
+ const struct qcom_aoss_desc *desc;
+};
+
+static const struct regmap_config aoss_sdm845_regmap_config = {
+ .name = "aoss-reset",
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = 0x20000,
+ .fast_io = true,
+};
+
+static const struct qcom_aoss_reset_map aoss_sdm845_resets[] = {
+ [AOSS_CC_MSS_RESTART] = { 0x0, 0 },
+ [AOSS_CC_CAMSS_RESTART] = { 0x1000, 0 },
+ [AOSS_CC_VENUS_RESTART] = { 0x2000, 0 },
+ [AOSS_CC_GPU_RESTART] = { 0x3000, 0 },
+ [AOSS_CC_DISPSS_RESTART] = { 0x4000, 0 },
+ [AOSS_CC_WCSS_RESTART] = { 0x10000, 0 },
+ [AOSS_CC_LPASS_RESTART] = { 0x20000, 0 },
+};
+
+static const struct qcom_aoss_desc aoss_sdm845_desc = {
+ .config = &aoss_sdm845_regmap_config,
+ .resets = aoss_sdm845_resets,
+ /* Wait 6 32kHz sleep cycles for reset */
+ .delay = 200,
+ .num_resets = ARRAY_SIZE(aoss_sdm845_resets),
+};
+
+static struct qcom_aoss_reset_data *to_qcom_aoss_reset_data(
+ struct reset_controller_dev *rcdev)
+{
+ return container_of(rcdev, struct qcom_aoss_reset_data, rcdev);
+}
+
+static int qcom_aoss_control_assert(struct reset_controller_dev *rcdev,
+ unsigned long idx)
+{
+ struct qcom_aoss_reset_data *data = to_qcom_aoss_reset_data(rcdev);
+ const struct qcom_aoss_reset_map *map = &data->desc->resets[idx];
+
+ return regmap_update_bits(data->regmap, map->reg,
+ BIT(map->bit), BIT(map->bit));
+}
+
+static int qcom_aoss_control_deassert(struct reset_controller_dev *rcdev,
+ unsigned long idx)
+{
+ struct qcom_aoss_reset_data *data = to_qcom_aoss_reset_data(rcdev);
+ const struct qcom_aoss_reset_map *map = &data->desc->resets[idx];
+
+ return regmap_update_bits(data->regmap, map->reg, BIT(map->bit), 0);
+}
+
+static int qcom_aoss_control_reset(struct reset_controller_dev *rcdev,
+ unsigned long idx)
+{
+ struct qcom_aoss_reset_data *data = to_qcom_aoss_reset_data(rcdev);
+ int ret;
+
+ ret = qcom_aoss_control_assert(rcdev, idx);
+ if (ret)
+ return ret;
+
+ udelay(data->desc->delay);
+
+ return qcom_aoss_control_deassert(rcdev, idx);
+}
+
+static const struct reset_control_ops qcom_aoss_reset_ops = {
+ .reset = qcom_aoss_control_reset,
+ .assert = qcom_aoss_control_assert,
+ .deassert = qcom_aoss_control_deassert,
+};
+
+static int qcom_aoss_reset_probe(struct platform_device *pdev)
+{
+ struct qcom_aoss_reset_data *data;
+ struct device *dev = &pdev->dev;
+ const struct qcom_aoss_desc *desc;
+
+ desc = of_device_get_match_data(dev);
+ if (!desc)
+ return -EINVAL;
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->desc = desc;
+ data->regmap = syscon_node_to_regmap(dev->of_node);
+ if (IS_ERR(data->regmap)) {
+ dev_err(dev, "Unable to get aoss-reset regmap");
+ return PTR_ERR(data->regmap);
+ }
+ regmap_attach_dev(dev, data->regmap, desc->config);
+
+ data->rcdev.owner = THIS_MODULE;
+ data->rcdev.ops = &qcom_aoss_reset_ops;
+ data->rcdev.nr_resets = desc->num_resets;
+ data->rcdev.of_node = dev->of_node;
+
+ return devm_reset_controller_register(dev, &data->rcdev);
+}
+
+static const struct of_device_id qcom_aoss_reset_of_match[] = {
+ { .compatible = "qcom,aoss-reset-sdm845", .data = &aoss_sdm845_desc },
+ {}
+};
+
+static struct platform_driver qcom_aoss_reset_driver = {
+ .probe = qcom_aoss_reset_probe,
+ .driver = {
+ .name = "qcom_aoss_reset",
+ .of_match_table = qcom_aoss_reset_of_match,
+ },
+};
+
+builtin_platform_driver(qcom_aoss_reset_driver);
+
+MODULE_DESCRIPTION("Qualcomm AOSS Reset Driver");
+MODULE_LICENSE("GPL v2");
diff --git a/include/dt-bindings/reset/qcom,aoss-sdm845.h b/include/dt-bindings/reset/qcom,aoss-sdm845.h
new file mode 100644
index 0000000..e9b38fc
--- /dev/null
+++ b/include/dt-bindings/reset/qcom,aoss-sdm845.h
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 The Linux Foundation. All rights reserved.
+ */
+
+#ifndef _DT_BINDINGS_RESET_AOSS_SDM_845_H
+#define _DT_BINDINGS_RESET_AOSS_SDM_845_H
+
+#define AOSS_CC_MSS_RESTART 0
+#define AOSS_CC_CAMSS_RESTART 1
+#define AOSS_CC_VENUS_RESTART 2
+#define AOSS_CC_GPU_RESTART 3
+#define AOSS_CC_DISPSS_RESTART 4
+#define AOSS_CC_WCSS_RESTART 5
+#define AOSS_CC_LPASS_RESTART 6
+
+#endif
--
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