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authorSibi Sankar <sibis@codeaurora.org>2018-06-27 19:54:43 +0530
committerPhilipp Zabel <p.zabel@pengutronix.de>2018-07-16 12:15:51 +0200
commit5ecb065165b90a5745f3a6c3a8a847b530e3afbc (patch)
tree29daefe25147e5e29a8e30f5caa5a208bb949ae5 /drivers/reset
parentb79df1ec22a3924a09028b98807fa71ea612af9d (diff)
downloadtalos-obmc-linux-5ecb065165b90a5745f3a6c3a8a847b530e3afbc.tar.gz
talos-obmc-linux-5ecb065165b90a5745f3a6c3a8a847b530e3afbc.zip
reset: qcom: AOSS (always on subsystem) reset controller
Add reset controller driver for Qualcomm SDM845 SoC to control reset signals provided by AOSS for Modem, Venus ADSP, GPU, Camera, Wireless, Display subsystem Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Sibi Sankar <sibis@codeaurora.org> Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Diffstat (limited to 'drivers/reset')
-rw-r--r--drivers/reset/Kconfig9
-rw-r--r--drivers/reset/Makefile1
-rw-r--r--drivers/reset/reset-qcom-aoss.c133
3 files changed, 143 insertions, 0 deletions
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index c0b292be1b72..756ad2b27d0f 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -82,6 +82,15 @@ 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
+ 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 || ARCH_ASPEED
diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index c1261dcfe9ad..6881e4d287f0 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-$(CONFIG_RESET_STM32MP157) += reset-stm32mp1.o
obj-$(CONFIG_RESET_SUNXI) += reset-sunxi.o
diff --git a/drivers/reset/reset-qcom-aoss.c b/drivers/reset/reset-qcom-aoss.c
new file mode 100644
index 000000000000..36db96750450
--- /dev/null
+++ b/drivers/reset/reset-qcom-aoss.c
@@ -0,0 +1,133 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/reset-controller.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/of_device.h>
+#include <dt-bindings/reset/qcom,sdm845-aoss.h>
+
+struct qcom_aoss_reset_map {
+ unsigned int reg;
+};
+
+struct qcom_aoss_desc {
+ const struct qcom_aoss_reset_map *resets;
+ size_t num_resets;
+};
+
+struct qcom_aoss_reset_data {
+ struct reset_controller_dev rcdev;
+ void __iomem *base;
+ const struct qcom_aoss_desc *desc;
+};
+
+static const struct qcom_aoss_reset_map sdm845_aoss_resets[] = {
+ [AOSS_CC_MSS_RESTART] = {0x10000},
+ [AOSS_CC_CAMSS_RESTART] = {0x11000},
+ [AOSS_CC_VENUS_RESTART] = {0x12000},
+ [AOSS_CC_GPU_RESTART] = {0x13000},
+ [AOSS_CC_DISPSS_RESTART] = {0x14000},
+ [AOSS_CC_WCSS_RESTART] = {0x20000},
+ [AOSS_CC_LPASS_RESTART] = {0x30000},
+};
+
+static const struct qcom_aoss_desc sdm845_aoss_desc = {
+ .resets = sdm845_aoss_resets,
+ .num_resets = ARRAY_SIZE(sdm845_aoss_resets),
+};
+
+static inline 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];
+
+ writel(1, data->base + map->reg);
+ /* Wait 6 32kHz sleep cycles for reset */
+ usleep_range(200, 300);
+ return 0;
+}
+
+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];
+
+ writel(0, data->base + map->reg);
+ /* Wait 6 32kHz sleep cycles for reset */
+ usleep_range(200, 300);
+ return 0;
+}
+
+static int qcom_aoss_control_reset(struct reset_controller_dev *rcdev,
+ unsigned long idx)
+{
+ qcom_aoss_control_assert(rcdev, idx);
+
+ 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;
+ struct resource *res;
+
+ 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;
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ data->base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(data->base))
+ return PTR_ERR(data->base);
+
+ 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,sdm845-aoss-cc", .data = &sdm845_aoss_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");
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