From 4352b8aee98005853aa63f57d6377282de17a33f Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 23 Aug 2026 13:28:57 -0700 Subject: Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux Pull I3C updates from Alexandre Belloni: "A new driver this cycle, for the AMD AXI I3C controller. There are also new features such as IBI wakeup support, SETAASA device discovery and ACPI support for the the DAA methods, meaning we can now communicate with the SPD devices on DDR5 modules. New driver: - AMD AXI I3C master controller Subsystem: - I3C Common Command Code (CCC) handling improvements, especially around GET CCCs - SETAASA device discovery support - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as well as I2C devices on I3C bus - IBI-based wakeup support Drivers: - dw: SETAASA support - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C controller support, PIO queue management support for HCI v1.2 - renesas: improve suspend to RAM support, add runtime PM support" * tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits) i3c: dw: reduce do_daa time if there's no client i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2 i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode i3c: dw: rename "pclk" to "apb" to match dt-binding i3c: dw: make struct dw_i3c_cmd smaller i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding i3c: renesas: Don't register devices when ENTDAA times out i3c: master: dw-i3c-master: fix OD timing for first broadcast i3c: mipi-i3c-hci: Advertise IBI wakeup capability i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev() i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI i3c: master: Reject IBI requests from non-IBI-capable devices i3c: master: Add helper to query bus wakeup requirements i3c: master: Report wakeup events for IBIs i3c: master: Support IBI-based wakeup capability i3c: master: Fix potential UAF in i3c_device_match() i3c: master: Fix potential UAF in i3c_device_uevent() i3c: Make dev->desc locking assumptions explicit i3c: master: Fix use-after-free of master->this ... --- drivers/interconnect/samsung/Kconfig | 15 +++ drivers/interconnect/samsung/Makefile | 4 + drivers/interconnect/samsung/exynos.c | 196 ++++++++++++++++++++++++++++++++++ 3 files changed, 215 insertions(+) create mode 100644 drivers/interconnect/samsung/Kconfig create mode 100644 drivers/interconnect/samsung/Makefile create mode 100644 drivers/interconnect/samsung/exynos.c (limited to 'drivers/interconnect/samsung') diff --git a/drivers/interconnect/samsung/Kconfig b/drivers/interconnect/samsung/Kconfig new file mode 100644 index 000000000..fbee87e37 --- /dev/null +++ b/drivers/interconnect/samsung/Kconfig @@ -0,0 +1,15 @@ +# SPDX-License-Identifier: GPL-2.0-only +config INTERCONNECT_SAMSUNG + bool "Samsung SoC interconnect drivers" + depends on ARCH_EXYNOS || COMPILE_TEST + help + Interconnect drivers for Samsung SoCs. + +config INTERCONNECT_EXYNOS + tristate "Exynos SoC generic interconnect driver" + depends on INTERCONNECT_SAMSUNG + default y if ARCH_EXYNOS + help + Generic interconnect driver for Samsung Exynos SoCs (e.g. Exynos3250, + Exynos4210, Exynos4412, Exynos542x, Exynos5433). + Choose Y here only if you build for such Samsung SoC. diff --git a/drivers/interconnect/samsung/Makefile b/drivers/interconnect/samsung/Makefile new file mode 100644 index 000000000..e19d1df7d --- /dev/null +++ b/drivers/interconnect/samsung/Makefile @@ -0,0 +1,4 @@ +# SPDX-License-Identifier: GPL-2.0 +exynos-interconnect-objs := exynos.o + +obj-$(CONFIG_INTERCONNECT_EXYNOS) += exynos-interconnect.o diff --git a/drivers/interconnect/samsung/exynos.c b/drivers/interconnect/samsung/exynos.c new file mode 100644 index 000000000..8e8f56186 --- /dev/null +++ b/drivers/interconnect/samsung/exynos.c @@ -0,0 +1,196 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Exynos generic interconnect provider driver + * + * Copyright (c) 2020 Samsung Electronics Co., Ltd. + * + * Authors: Artur Świgoń + * Sylwester Nawrocki + */ +#include +#include +#include +#include +#include +#include +#include + +#define EXYNOS_ICC_DEFAULT_BUS_CLK_RATIO 8 + +struct exynos_icc_priv { + struct device *dev; + + /* One interconnect node per provider */ + struct icc_provider provider; + struct icc_node *node; + + struct dev_pm_qos_request qos_req; + u32 bus_clk_ratio; +}; + +static struct icc_node *exynos_icc_get_parent(struct device_node *np) +{ + struct of_phandle_args args; + struct icc_node_data *icc_node_data; + struct icc_node *icc_node; + int num, ret; + + num = of_count_phandle_with_args(np, "interconnects", + "#interconnect-cells"); + if (num < 1) + return NULL; /* parent nodes are optional */ + + /* Get the interconnect target node */ + ret = of_parse_phandle_with_args(np, "interconnects", + "#interconnect-cells", 0, &args); + if (ret < 0) + return ERR_PTR(ret); + + icc_node_data = of_icc_get_from_provider(&args); + of_node_put(args.np); + + if (IS_ERR(icc_node_data)) + return ERR_CAST(icc_node_data); + + icc_node = icc_node_data->node; + kfree(icc_node_data); + + return icc_node; +} + +static int exynos_generic_icc_set(struct icc_node *src, struct icc_node *dst) +{ + struct exynos_icc_priv *src_priv = src->data, *dst_priv = dst->data; + s32 src_freq = max(src->avg_bw, src->peak_bw) / src_priv->bus_clk_ratio; + s32 dst_freq = max(dst->avg_bw, dst->peak_bw) / dst_priv->bus_clk_ratio; + int ret; + + ret = dev_pm_qos_update_request(&src_priv->qos_req, src_freq); + if (ret < 0) { + dev_err(src_priv->dev, "failed to update PM QoS of %s (src)\n", + src->name); + return ret; + } + + ret = dev_pm_qos_update_request(&dst_priv->qos_req, dst_freq); + if (ret < 0) { + dev_err(dst_priv->dev, "failed to update PM QoS of %s (dst)\n", + dst->name); + return ret; + } + + return 0; +} + +static struct icc_node *exynos_generic_icc_xlate(const struct of_phandle_args *spec, + void *data) +{ + struct exynos_icc_priv *priv = data; + + if (spec->np != priv->dev->parent->of_node) + return ERR_PTR(-EINVAL); + + return priv->node; +} + +static void exynos_generic_icc_remove(struct platform_device *pdev) +{ + struct exynos_icc_priv *priv = platform_get_drvdata(pdev); + + icc_provider_deregister(&priv->provider); + icc_nodes_remove(&priv->provider); +} + +static int exynos_generic_icc_probe(struct platform_device *pdev) +{ + struct device *bus_dev = pdev->dev.parent; + struct exynos_icc_priv *priv; + struct icc_provider *provider; + struct icc_node *icc_node, *icc_parent_node; + int ret; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->dev = &pdev->dev; + platform_set_drvdata(pdev, priv); + + provider = &priv->provider; + + provider->set = exynos_generic_icc_set; + provider->aggregate = icc_std_aggregate; + provider->xlate = exynos_generic_icc_xlate; + provider->dev = bus_dev; + provider->inter_set = true; + provider->data = priv; + + icc_provider_init(provider); + + icc_node = icc_node_create(pdev->id); + if (IS_ERR(icc_node)) + return PTR_ERR(icc_node); + + priv->node = icc_node; + icc_node->name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%pOFn", + bus_dev->of_node); + if (!icc_node->name) { + icc_node_destroy(pdev->id); + return -ENOMEM; + } + + if (of_property_read_u32(bus_dev->of_node, "samsung,data-clock-ratio", + &priv->bus_clk_ratio)) + priv->bus_clk_ratio = EXYNOS_ICC_DEFAULT_BUS_CLK_RATIO; + + icc_node->data = priv; + icc_node_add(icc_node, provider); + + /* + * Register a PM QoS request for the parent (devfreq) device. + */ + ret = dev_pm_qos_add_request(bus_dev, &priv->qos_req, + DEV_PM_QOS_MIN_FREQUENCY, 0); + if (ret < 0) + goto err_node_del; + + icc_parent_node = exynos_icc_get_parent(bus_dev->of_node); + if (IS_ERR(icc_parent_node)) { + ret = PTR_ERR(icc_parent_node); + goto err_pmqos_del; + } + if (icc_parent_node) { + ret = icc_link_create(icc_node, icc_parent_node->id); + if (ret < 0) + goto err_pmqos_del; + } + + ret = icc_provider_register(provider); + if (ret < 0) + goto err_pmqos_del; + + return 0; + +err_pmqos_del: + dev_pm_qos_remove_request(&priv->qos_req); +err_node_del: + icc_nodes_remove(provider); + + return ret; +} + +static struct platform_driver exynos_generic_icc_driver = { + .driver = { + .name = "exynos-generic-icc", + .sync_state = icc_sync_state, + }, + .probe = exynos_generic_icc_probe, + .remove = exynos_generic_icc_remove, +}; +module_platform_driver(exynos_generic_icc_driver); + +MODULE_DESCRIPTION("Exynos generic interconnect driver"); +MODULE_AUTHOR("Artur Świgoń "); +MODULE_AUTHOR("Sylwester Nawrocki "); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:exynos-generic-icc"); -- cgit v1.3.1