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authorLinus Torvalds <torvalds@linux-foundation.org>2018-10-29 15:16:01 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-10-29 15:16:01 -0700
commitb22b6beae6116e3a9c46ced312c626f6737a3fa6 (patch)
treec92228669e0444d91fd1445bc562351fd69b58cc /drivers/reset
parent53b7a3b7ec00f207c18e71f58ef2bca48635c622 (diff)
parentc1a92909dbc2090753ff6224971d9b8ae5f93c97 (diff)
Merge tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM SoC driver updates from Arnd Bergmann: "The most noteworthy SoC driver changes this time include: - The TEE subsystem gains an in-kernel interface to access the TEE from device drivers. - The reset controller subsystem gains a driver for the Qualcomm Snapdragon 845 Power Domain Controller. - The Xilinx Zynq platform now has a firmware interface for its platform management unit. This contains a firmware "ioctl" interface that was a little controversial at first, but the version we merged solved that by not exposing arbitrary firmware calls to user space. - The Amlogic Meson platform gains a "canvas" driver that is used for video processing and shared between different high-level drivers. The rest is more of the usual, mostly related to SoC specific power management support and core drivers in drivers/soc: - Several Renesas SoCs (RZ/G1N, RZ/G2M, R-Car V3M, RZ/A2M) gain new features related to power and reset control. - The Mediatek mt8183 and mt6765 SoC platforms gain support for their respective power management chips. - A new driver for NXP i.MX8, which need a firmware interface for power management. - The SCPI firmware interface now contains support estimating power usage of performance states - The NVIDIA Tegra "pmc" driver gains a few new features, in particular a pinctrl interface for configuring the pads. - Lots of small changes for Qualcomm, in particular the "smem" device driver. - Some cleanups for the TI OMAP series related to their sysc controller. Additional cleanups and bugfixes in SoC specific drivers include the Meson, Keystone, NXP, AT91, Sunxi, Actions, and Tegra platforms" * tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (129 commits) firmware: tegra: bpmp: Implement suspend/resume support drivers: clk: Add ZynqMP clock driver dt-bindings: clock: Add bindings for ZynqMP clock driver firmware: xilinx: Add zynqmp IOCTL API for device control Documentation: xilinx: Add documentation for eemi APIs MAINTAINERS: imx: include drivers/firmware/imx path firmware: imx: add misc svc support firmware: imx: add SCU firmware driver support reset: Fix potential use-after-free in __of_reset_control_get() dt-bindings: arm: fsl: add scu binding doc soc: fsl: qbman: add interrupt coalesce changing APIs soc: fsl: bman_portals: defer probe after bman's probe soc: fsl: qbman: Use last response to determine valid bit soc: fsl: qbman: Add 64 bit DMA addressing requirement to QBMan soc: fsl: qbman: replace CPU 0 with any online CPU in hotplug handlers soc: fsl: qbman: Check if CPU is offline when initializing portals reset: qcom: PDC Global (Power Domain Controller) reset controller dt-bindings: reset: Add PDC Global binding for SDM845 SoCs reset: Grammar s/more then once/more than once/ bus: ti-sysc: Just use SET_NOIRQ_SYSTEM_SLEEP_PM_OPS ...
Diffstat (limited to 'drivers/reset')
-rw-r--r--drivers/reset/Kconfig9
-rw-r--r--drivers/reset/Makefile1
-rw-r--r--drivers/reset/core.c15
-rw-r--r--drivers/reset/reset-qcom-pdc.c124
4 files changed, 142 insertions, 7 deletions
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index 13d28fdbdbb5..c21da9fe51ec 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -98,6 +98,15 @@ config RESET_QCOM_AOSS
reset signals provided by AOSS for Modem, Venus, ADSP,
GPU, Camera, Wireless, Display subsystem. Otherwise, say N.
+config RESET_QCOM_PDC
+ tristate "Qualcomm PDC Reset Driver"
+ depends on ARCH_QCOM || COMPILE_TEST
+ help
+ This enables the PDC (Power Domain Controller) reset driver
+ for Qualcomm Technologies Inc SDM845 SoCs. Say Y if you want
+ to control reset signals provided by PDC for Modem, Compute,
+ Display, GPU, Debug, AOP, Sensors, Audio, SP and APPS.
+
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 4243c38228e2..d08e8b90046a 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_RESET_MESON_AUDIO_ARB) += reset-meson-audio-arb.o
obj-$(CONFIG_RESET_OXNAS) += reset-oxnas.o
obj-$(CONFIG_RESET_PISTACHIO) += reset-pistachio.o
obj-$(CONFIG_RESET_QCOM_AOSS) += reset-qcom-aoss.o
+obj-$(CONFIG_RESET_QCOM_PDC) += reset-qcom-pdc.o
obj-$(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/core.c b/drivers/reset/core.c
index 225e34c56b94..d1887c0ed5d3 100644
--- a/drivers/reset/core.c
+++ b/drivers/reset/core.c
@@ -496,28 +496,29 @@ struct reset_control *__of_reset_control_get(struct device_node *node,
break;
}
}
- of_node_put(args.np);
if (!rcdev) {
- mutex_unlock(&reset_list_mutex);
- return ERR_PTR(-EPROBE_DEFER);
+ rstc = ERR_PTR(-EPROBE_DEFER);
+ goto out;
}
if (WARN_ON(args.args_count != rcdev->of_reset_n_cells)) {
- mutex_unlock(&reset_list_mutex);
- return ERR_PTR(-EINVAL);
+ rstc = ERR_PTR(-EINVAL);
+ goto out;
}
rstc_id = rcdev->of_xlate(rcdev, &args);
if (rstc_id < 0) {
- mutex_unlock(&reset_list_mutex);
- return ERR_PTR(rstc_id);
+ rstc = ERR_PTR(rstc_id);
+ goto out;
}
/* reset_list_mutex also protects the rcdev's reset_control list */
rstc = __reset_control_get_internal(rcdev, rstc_id, shared);
+out:
mutex_unlock(&reset_list_mutex);
+ of_node_put(args.np);
return rstc;
}
diff --git a/drivers/reset/reset-qcom-pdc.c b/drivers/reset/reset-qcom-pdc.c
new file mode 100644
index 000000000000..ab74bccd4a5b
--- /dev/null
+++ b/drivers/reset/reset-qcom-pdc.c
@@ -0,0 +1,124 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/reset-controller.h>
+
+#include <dt-bindings/reset/qcom,sdm845-pdc.h>
+
+#define RPMH_PDC_SYNC_RESET 0x100
+
+struct qcom_pdc_reset_map {
+ u8 bit;
+};
+
+struct qcom_pdc_reset_data {
+ struct reset_controller_dev rcdev;
+ struct regmap *regmap;
+};
+
+static const struct regmap_config sdm845_pdc_regmap_config = {
+ .name = "pdc-reset",
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = 0x20000,
+ .fast_io = true,
+};
+
+static const struct qcom_pdc_reset_map sdm845_pdc_resets[] = {
+ [PDC_APPS_SYNC_RESET] = {0},
+ [PDC_SP_SYNC_RESET] = {1},
+ [PDC_AUDIO_SYNC_RESET] = {2},
+ [PDC_SENSORS_SYNC_RESET] = {3},
+ [PDC_AOP_SYNC_RESET] = {4},
+ [PDC_DEBUG_SYNC_RESET] = {5},
+ [PDC_GPU_SYNC_RESET] = {6},
+ [PDC_DISPLAY_SYNC_RESET] = {7},
+ [PDC_COMPUTE_SYNC_RESET] = {8},
+ [PDC_MODEM_SYNC_RESET] = {9},
+};
+
+static inline struct qcom_pdc_reset_data *to_qcom_pdc_reset_data(
+ struct reset_controller_dev *rcdev)
+{
+ return container_of(rcdev, struct qcom_pdc_reset_data, rcdev);
+}
+
+static int qcom_pdc_control_assert(struct reset_controller_dev *rcdev,
+ unsigned long idx)
+{
+ struct qcom_pdc_reset_data *data = to_qcom_pdc_reset_data(rcdev);
+
+ return regmap_update_bits(data->regmap, RPMH_PDC_SYNC_RESET,
+ BIT(sdm845_pdc_resets[idx].bit),
+ BIT(sdm845_pdc_resets[idx].bit));
+}
+
+static int qcom_pdc_control_deassert(struct reset_controller_dev *rcdev,
+ unsigned long idx)
+{
+ struct qcom_pdc_reset_data *data = to_qcom_pdc_reset_data(rcdev);
+
+ return regmap_update_bits(data->regmap, RPMH_PDC_SYNC_RESET,
+ BIT(sdm845_pdc_resets[idx].bit), 0);
+}
+
+static const struct reset_control_ops qcom_pdc_reset_ops = {
+ .assert = qcom_pdc_control_assert,
+ .deassert = qcom_pdc_control_deassert,
+};
+
+static int qcom_pdc_reset_probe(struct platform_device *pdev)
+{
+ struct qcom_pdc_reset_data *data;
+ struct device *dev = &pdev->dev;
+ void __iomem *base;
+ struct resource *res;
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ data->regmap = devm_regmap_init_mmio(dev, base,
+ &sdm845_pdc_regmap_config);
+ if (IS_ERR(data->regmap)) {
+ dev_err(dev, "Unable to initialize regmap\n");
+ return PTR_ERR(data->regmap);
+ }
+
+ data->rcdev.owner = THIS_MODULE;
+ data->rcdev.ops = &qcom_pdc_reset_ops;
+ data->rcdev.nr_resets = ARRAY_SIZE(sdm845_pdc_resets);
+ data->rcdev.of_node = dev->of_node;
+
+ return devm_reset_controller_register(dev, &data->rcdev);
+}
+
+static const struct of_device_id qcom_pdc_reset_of_match[] = {
+ { .compatible = "qcom,sdm845-pdc-global" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, qcom_pdc_reset_of_match);
+
+static struct platform_driver qcom_pdc_reset_driver = {
+ .probe = qcom_pdc_reset_probe,
+ .driver = {
+ .name = "qcom_pdc_reset",
+ .of_match_table = qcom_pdc_reset_of_match,
+ },
+};
+module_platform_driver(qcom_pdc_reset_driver);
+
+MODULE_DESCRIPTION("Qualcomm PDC Reset Driver");
+MODULE_LICENSE("GPL v2");