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| author | Miguel Ojeda <ojeda@kernel.org> | 2026-08-16 15:32:33 +0200 |
|---|---|---|
| committer | Miguel Ojeda <ojeda@kernel.org> | 2026-08-23 21:27:17 +0200 |
| commit | 5febf432df1cfa5b25d99b54c32103fafbdd0eb9 (patch) | |
| tree | 93a1ed1d337bc53adf1e572c2586d347703b286e /drivers/reset/amlogic | |
| download | linux-stable-5febf432df1cfa5b25d99b54c32103fafbdd0eb9.tar.gz linux-stable-5febf432df1cfa5b25d99b54c32103fafbdd0eb9.zip | |
kbuild: rust: keep Rust objects out of Clang LTO with inline helpersgrafted
Under `CONFIG_LTO_CLANG` + `CONFIG_RUST_INLINE_HELPERS`, one may hit
`objtool` errors such as:
vmlinux.o: error: objtool: _R..._3Gsp4boot+0xd6a:
can't find jump dest instruction at .text._R..._3Gsp4boot+0x1dfd
The reason is that in such builds, the Clang invocation that compiles
the combined Rust plus helpers bitcode emits LLVM bitcode (again) --
the final code generation happens in the linker's LTO step, which the
`-mllvm` trap options passed to Clang do not reach.
This, in turn, means that unreachable traps are missing, and the
impossible paths do not merely fallthrough to the next symbol, but past
the end of their own section, since LTO builds place each function in
its own section.
Thus filter `CC_FLAGS_LTO` out of the Clang invocation, so that it always
emits machine code directly, with the traps in place.
Assisted-by: LLM
Cc: Gary Guo <gary@garyguo.net>
Cc: Boqun Feng <boqun@kernel.org>
Cc: Alice Ryhl <aliceryhl@google.com>
Cc: Matthew Maurer <mmaurer@google.com>
Cc: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: stable@vger.kernel.org
Fixes: 3a2486cc1da5 ("kbuild: rust: provide an option to inline C helpers into Rust")
Acked-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260816133233.197500-2-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Diffstat (limited to 'drivers/reset/amlogic')
| -rw-r--r-- | drivers/reset/amlogic/Kconfig | 27 | ||||
| -rw-r--r-- | drivers/reset/amlogic/Makefile | 4 | ||||
| -rw-r--r-- | drivers/reset/amlogic/reset-meson-audio-arb.c | 193 | ||||
| -rw-r--r-- | drivers/reset/amlogic/reset-meson-aux.c | 81 | ||||
| -rw-r--r-- | drivers/reset/amlogic/reset-meson-common.c | 142 | ||||
| -rw-r--r-- | drivers/reset/amlogic/reset-meson.c | 106 | ||||
| -rw-r--r-- | drivers/reset/amlogic/reset-meson.h | 28 |
7 files changed, 581 insertions, 0 deletions
diff --git a/drivers/reset/amlogic/Kconfig b/drivers/reset/amlogic/Kconfig new file mode 100644 index 000000000..3bee9fd60 --- /dev/null +++ b/drivers/reset/amlogic/Kconfig @@ -0,0 +1,27 @@ +config RESET_MESON_COMMON + tristate + select REGMAP + +config RESET_MESON + tristate "Meson Reset Driver" + depends on ARCH_MESON || COMPILE_TEST + default ARCH_MESON + select REGMAP_MMIO + select RESET_MESON_COMMON + help + This enables the reset driver for Amlogic SoCs. + +config RESET_MESON_AUX + tristate "Meson Reset Auxiliary Driver" + depends on ARCH_MESON || COMPILE_TEST + select AUXILIARY_BUS + select RESET_MESON_COMMON + help + This enables the reset auxiliary driver for Amlogic SoCs. + +config RESET_MESON_AUDIO_ARB + tristate "Meson Audio Memory Arbiter Reset Driver" + depends on ARCH_MESON || COMPILE_TEST + help + This enables the reset driver for Audio Memory Arbiter of + Amlogic's A113 based SoCs diff --git a/drivers/reset/amlogic/Makefile b/drivers/reset/amlogic/Makefile new file mode 100644 index 000000000..ca99a6912 --- /dev/null +++ b/drivers/reset/amlogic/Makefile @@ -0,0 +1,4 @@ +obj-$(CONFIG_RESET_MESON) += reset-meson.o +obj-$(CONFIG_RESET_MESON_AUX) += reset-meson-aux.o +obj-$(CONFIG_RESET_MESON_COMMON) += reset-meson-common.o +obj-$(CONFIG_RESET_MESON_AUDIO_ARB) += reset-meson-audio-arb.o diff --git a/drivers/reset/amlogic/reset-meson-audio-arb.c b/drivers/reset/amlogic/reset-meson-audio-arb.c new file mode 100644 index 000000000..6ec253976 --- /dev/null +++ b/drivers/reset/amlogic/reset-meson-audio-arb.c @@ -0,0 +1,193 @@ +// SPDX-License-Identifier: (GPL-2.0 OR MIT) +// Copyright (c) 2018 BayLibre, SAS. +// Author: Jerome Brunet <jbrunet@baylibre.com> + +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/reset-controller.h> +#include <linux/spinlock.h> + +#include <dt-bindings/reset/amlogic,meson-axg-audio-arb.h> + +struct meson_audio_arb_data { + struct reset_controller_dev rstc; + void __iomem *regs; + struct clk *clk; + const unsigned int *reset_bits; + spinlock_t lock; +}; + +struct meson_audio_arb_match_data { + const unsigned int *reset_bits; + unsigned int reset_num; +}; + +#define ARB_GENERAL_BIT 31 + +static const unsigned int axg_audio_arb_reset_bits[] = { + [AXG_ARB_TODDR_A] = 0, + [AXG_ARB_TODDR_B] = 1, + [AXG_ARB_TODDR_C] = 2, + [AXG_ARB_FRDDR_A] = 4, + [AXG_ARB_FRDDR_B] = 5, + [AXG_ARB_FRDDR_C] = 6, +}; + +static const struct meson_audio_arb_match_data axg_audio_arb_match = { + .reset_bits = axg_audio_arb_reset_bits, + .reset_num = ARRAY_SIZE(axg_audio_arb_reset_bits), +}; + +static const unsigned int sm1_audio_arb_reset_bits[] = { + [AXG_ARB_TODDR_A] = 0, + [AXG_ARB_TODDR_B] = 1, + [AXG_ARB_TODDR_C] = 2, + [AXG_ARB_FRDDR_A] = 4, + [AXG_ARB_FRDDR_B] = 5, + [AXG_ARB_FRDDR_C] = 6, + [AXG_ARB_TODDR_D] = 3, + [AXG_ARB_FRDDR_D] = 7, +}; + +static const struct meson_audio_arb_match_data sm1_audio_arb_match = { + .reset_bits = sm1_audio_arb_reset_bits, + .reset_num = ARRAY_SIZE(sm1_audio_arb_reset_bits), +}; + +static int meson_audio_arb_update(struct reset_controller_dev *rcdev, + unsigned long id, bool assert) +{ + u32 val; + struct meson_audio_arb_data *arb = + container_of(rcdev, struct meson_audio_arb_data, rstc); + + spin_lock(&arb->lock); + val = readl(arb->regs); + + if (assert) + val &= ~BIT(arb->reset_bits[id]); + else + val |= BIT(arb->reset_bits[id]); + + writel(val, arb->regs); + spin_unlock(&arb->lock); + + return 0; +} + +static int meson_audio_arb_status(struct reset_controller_dev *rcdev, + unsigned long id) +{ + u32 val; + struct meson_audio_arb_data *arb = + container_of(rcdev, struct meson_audio_arb_data, rstc); + + val = readl(arb->regs); + + return !(val & BIT(arb->reset_bits[id])); +} + +static int meson_audio_arb_assert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + return meson_audio_arb_update(rcdev, id, true); +} + +static int meson_audio_arb_deassert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + return meson_audio_arb_update(rcdev, id, false); +} + +static const struct reset_control_ops meson_audio_arb_rstc_ops = { + .assert = meson_audio_arb_assert, + .deassert = meson_audio_arb_deassert, + .status = meson_audio_arb_status, +}; + +static const struct of_device_id meson_audio_arb_of_match[] = { + { + .compatible = "amlogic,meson-axg-audio-arb", + .data = &axg_audio_arb_match, + }, { + .compatible = "amlogic,meson-sm1-audio-arb", + .data = &sm1_audio_arb_match, + }, + {} +}; +MODULE_DEVICE_TABLE(of, meson_audio_arb_of_match); + +static void meson_audio_arb_remove(struct platform_device *pdev) +{ + struct meson_audio_arb_data *arb = platform_get_drvdata(pdev); + + /* Disable all access */ + spin_lock(&arb->lock); + writel(0, arb->regs); + spin_unlock(&arb->lock); +} + +static int meson_audio_arb_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + const struct meson_audio_arb_match_data *data; + struct meson_audio_arb_data *arb; + int ret; + + data = of_device_get_match_data(dev); + if (!data) + return -EINVAL; + + arb = devm_kzalloc(dev, sizeof(*arb), GFP_KERNEL); + if (!arb) + return -ENOMEM; + platform_set_drvdata(pdev, arb); + + arb->clk = devm_clk_get_enabled(dev, NULL); + if (IS_ERR(arb->clk)) + return dev_err_probe(dev, PTR_ERR(arb->clk), "failed to get clock\n"); + + arb->regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(arb->regs)) + return PTR_ERR(arb->regs); + + spin_lock_init(&arb->lock); + arb->reset_bits = data->reset_bits; + arb->rstc.nr_resets = data->reset_num; + arb->rstc.ops = &meson_audio_arb_rstc_ops; + arb->rstc.of_node = dev->of_node; + arb->rstc.owner = THIS_MODULE; + + /* + * Enable general : + * In the initial state, all memory interfaces are disabled + * and the general bit is on + */ + writel(BIT(ARB_GENERAL_BIT), arb->regs); + + /* Register reset controller */ + ret = devm_reset_controller_register(dev, &arb->rstc); + if (ret) { + dev_err(dev, "failed to register arb reset controller\n"); + meson_audio_arb_remove(pdev); + } + + return ret; +} + +static struct platform_driver meson_audio_arb_pdrv = { + .probe = meson_audio_arb_probe, + .remove = meson_audio_arb_remove, + .driver = { + .name = "meson-audio-arb-reset", + .of_match_table = meson_audio_arb_of_match, + }, +}; +module_platform_driver(meson_audio_arb_pdrv); + +MODULE_DESCRIPTION("Amlogic A113 Audio Memory Arbiter"); +MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/reset/amlogic/reset-meson-aux.c b/drivers/reset/amlogic/reset-meson-aux.c new file mode 100644 index 000000000..33c060134 --- /dev/null +++ b/drivers/reset/amlogic/reset-meson-aux.c @@ -0,0 +1,81 @@ +// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause +/* + * Amlogic Meson Reset Auxiliary driver + * + * Copyright (c) 2024 BayLibre, SAS. + * Author: Jerome Brunet <jbrunet@baylibre.com> + */ + +#include <linux/err.h> +#include <linux/module.h> +#include <linux/auxiliary_bus.h> +#include <linux/regmap.h> +#include <linux/reset-controller.h> + +#include "reset-meson.h" + +static const struct meson_reset_param meson_a1_audio_param = { + .reset_ops = &meson_reset_toggle_ops, + .reset_num = 32, + .level_offset = 0x28, +}; + +static const struct meson_reset_param meson_a1_audio_vad_param = { + .reset_ops = &meson_reset_toggle_ops, + .reset_num = 6, + .level_offset = 0x8, +}; + +static const struct meson_reset_param meson_g12a_audio_param = { + .reset_ops = &meson_reset_toggle_ops, + .reset_num = 26, + .level_offset = 0x24, +}; + +static const struct meson_reset_param meson_sm1_audio_param = { + .reset_ops = &meson_reset_toggle_ops, + .reset_num = 39, + .level_offset = 0x28, +}; + +static const struct auxiliary_device_id meson_reset_aux_ids[] = { + { + .name = "a1-audio-clkc.rst-a1", + .driver_data = (kernel_ulong_t)&meson_a1_audio_param, + }, { + .name = "a1-audio-clkc.rst-a1-vad", + .driver_data = (kernel_ulong_t)&meson_a1_audio_vad_param, + }, { + .name = "axg-audio-clkc.rst-g12a", + .driver_data = (kernel_ulong_t)&meson_g12a_audio_param, + }, { + .name = "axg-audio-clkc.rst-sm1", + .driver_data = (kernel_ulong_t)&meson_sm1_audio_param, + }, {} +}; +MODULE_DEVICE_TABLE(auxiliary, meson_reset_aux_ids); + +static int meson_reset_aux_probe(struct auxiliary_device *adev, + const struct auxiliary_device_id *id) +{ + const struct meson_reset_param *param = + (const struct meson_reset_param *)(id->driver_data); + struct regmap *map; + + map = dev_get_regmap(adev->dev.parent, NULL); + if (!map) + return -EINVAL; + + return meson_reset_controller_register(&adev->dev, map, param); +} + +static struct auxiliary_driver meson_reset_aux_driver = { + .probe = meson_reset_aux_probe, + .id_table = meson_reset_aux_ids, +}; +module_auxiliary_driver(meson_reset_aux_driver); + +MODULE_DESCRIPTION("Amlogic Meson Reset Auxiliary driver"); +MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>"); +MODULE_LICENSE("Dual BSD/GPL"); +MODULE_IMPORT_NS("MESON_RESET"); diff --git a/drivers/reset/amlogic/reset-meson-common.c b/drivers/reset/amlogic/reset-meson-common.c new file mode 100644 index 000000000..a90e0ecaa --- /dev/null +++ b/drivers/reset/amlogic/reset-meson-common.c @@ -0,0 +1,142 @@ +// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause +/* + * Amlogic Meson Reset core functions + * + * Copyright (c) 2016-2024 BayLibre, SAS. + * Authors: Neil Armstrong <narmstrong@baylibre.com> + * Jerome Brunet <jbrunet@baylibre.com> + */ + +#include <linux/device.h> +#include <linux/module.h> +#include <linux/regmap.h> +#include <linux/reset-controller.h> + +#include "reset-meson.h" + +struct meson_reset { + const struct meson_reset_param *param; + struct reset_controller_dev rcdev; + struct regmap *map; +}; + +static void meson_reset_offset_and_bit(struct meson_reset *data, + unsigned long id, + unsigned int *offset, + unsigned int *bit) +{ + unsigned int stride = regmap_get_reg_stride(data->map); + + *offset = (id / (stride * BITS_PER_BYTE)) * stride; + *bit = id % (stride * BITS_PER_BYTE); +} + +static int meson_reset_reset(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct meson_reset *data = + container_of(rcdev, struct meson_reset, rcdev); + unsigned int offset, bit; + + meson_reset_offset_and_bit(data, id, &offset, &bit); + offset += data->param->reset_offset; + + return regmap_write(data->map, offset, BIT(bit)); +} + +static int meson_reset_level(struct reset_controller_dev *rcdev, + unsigned long id, bool assert) +{ + struct meson_reset *data = + container_of(rcdev, struct meson_reset, rcdev); + unsigned int offset, bit; + + meson_reset_offset_and_bit(data, id, &offset, &bit); + offset += data->param->level_offset; + assert ^= data->param->level_low_reset; + + return regmap_update_bits(data->map, offset, + BIT(bit), assert ? BIT(bit) : 0); +} + +static int meson_reset_status(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct meson_reset *data = + container_of(rcdev, struct meson_reset, rcdev); + unsigned int val, offset, bit; + + meson_reset_offset_and_bit(data, id, &offset, &bit); + offset += data->param->level_offset; + + regmap_read(data->map, offset, &val); + val = !!(BIT(bit) & val); + + return val ^ data->param->level_low_reset; +} + +static int meson_reset_assert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + return meson_reset_level(rcdev, id, true); +} + +static int meson_reset_deassert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + return meson_reset_level(rcdev, id, false); +} + +static int meson_reset_level_toggle(struct reset_controller_dev *rcdev, + unsigned long id) +{ + int ret; + + ret = meson_reset_assert(rcdev, id); + if (ret) + return ret; + + return meson_reset_deassert(rcdev, id); +} + +const struct reset_control_ops meson_reset_ops = { + .reset = meson_reset_reset, + .assert = meson_reset_assert, + .deassert = meson_reset_deassert, + .status = meson_reset_status, +}; +EXPORT_SYMBOL_NS_GPL(meson_reset_ops, "MESON_RESET"); + +const struct reset_control_ops meson_reset_toggle_ops = { + .reset = meson_reset_level_toggle, + .assert = meson_reset_assert, + .deassert = meson_reset_deassert, + .status = meson_reset_status, +}; +EXPORT_SYMBOL_NS_GPL(meson_reset_toggle_ops, "MESON_RESET"); + +int meson_reset_controller_register(struct device *dev, struct regmap *map, + const struct meson_reset_param *param) +{ + struct meson_reset *data; + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->param = param; + data->map = map; + data->rcdev.owner = dev->driver->owner; + data->rcdev.nr_resets = param->reset_num; + data->rcdev.ops = data->param->reset_ops; + data->rcdev.of_node = dev->of_node; + + return devm_reset_controller_register(dev, &data->rcdev); +} +EXPORT_SYMBOL_NS_GPL(meson_reset_controller_register, "MESON_RESET"); + +MODULE_DESCRIPTION("Amlogic Meson Reset Core function"); +MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>"); +MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>"); +MODULE_LICENSE("Dual BSD/GPL"); +MODULE_IMPORT_NS("MESON_RESET"); diff --git a/drivers/reset/amlogic/reset-meson.c b/drivers/reset/amlogic/reset-meson.c new file mode 100644 index 000000000..c303e8590 --- /dev/null +++ b/drivers/reset/amlogic/reset-meson.c @@ -0,0 +1,106 @@ +// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause +/* + * Amlogic Meson Reset Controller driver + * + * Copyright (c) 2016-2024 BayLibre, SAS. + * Authors: Neil Armstrong <narmstrong@baylibre.com> + * Jerome Brunet <jbrunet@baylibre.com> + */ + +#include <linux/err.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/reset-controller.h> + +#include "reset-meson.h" + +static const struct meson_reset_param meson8b_param = { + .reset_ops = &meson_reset_ops, + .reset_num = 256, + .reset_offset = 0x0, + .level_offset = 0x7c, + .level_low_reset = true, +}; + +static const struct meson_reset_param meson_a1_param = { + .reset_ops = &meson_reset_ops, + .reset_num = 96, + .reset_offset = 0x0, + .level_offset = 0x40, + .level_low_reset = true, +}; + +static const struct meson_reset_param meson_s4_param = { + .reset_ops = &meson_reset_ops, + .reset_num = 192, + .reset_offset = 0x0, + .level_offset = 0x40, + .level_low_reset = true, +}; + +static const struct meson_reset_param t7_param = { + .reset_ops = &meson_reset_ops, + .reset_num = 224, + .reset_offset = 0x0, + .level_offset = 0x40, + .level_low_reset = true, +}; + +static const struct of_device_id meson_reset_dt_ids[] = { + { .compatible = "amlogic,meson8b-reset", .data = &meson8b_param}, + { .compatible = "amlogic,meson-gxbb-reset", .data = &meson8b_param}, + { .compatible = "amlogic,meson-axg-reset", .data = &meson8b_param}, + { .compatible = "amlogic,meson-a1-reset", .data = &meson_a1_param}, + { .compatible = "amlogic,meson-s4-reset", .data = &meson_s4_param}, + { .compatible = "amlogic,c3-reset", .data = &meson_s4_param}, + { .compatible = "amlogic,t7-reset", .data = &t7_param}, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, meson_reset_dt_ids); + +static const struct regmap_config regmap_config = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, +}; + +static int meson_reset_probe(struct platform_device *pdev) +{ + const struct meson_reset_param *param; + struct device *dev = &pdev->dev; + struct regmap *map; + void __iomem *base; + + base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(base)) + return PTR_ERR(base); + + param = device_get_match_data(dev); + if (!param) + return -ENODEV; + + map = devm_regmap_init_mmio(dev, base, ®map_config); + if (IS_ERR(map)) + return dev_err_probe(dev, PTR_ERR(map), + "can't init regmap mmio region\n"); + + return meson_reset_controller_register(dev, map, param); +} + +static struct platform_driver meson_reset_driver = { + .probe = meson_reset_probe, + .driver = { + .name = "meson_reset", + .of_match_table = meson_reset_dt_ids, + }, +}; +module_platform_driver(meson_reset_driver); + +MODULE_DESCRIPTION("Amlogic Meson Reset Controller driver"); +MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>"); +MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>"); +MODULE_LICENSE("Dual BSD/GPL"); +MODULE_IMPORT_NS("MESON_RESET"); diff --git a/drivers/reset/amlogic/reset-meson.h b/drivers/reset/amlogic/reset-meson.h new file mode 100644 index 000000000..2051e126d --- /dev/null +++ b/drivers/reset/amlogic/reset-meson.h @@ -0,0 +1,28 @@ +/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */ +/* + * Copyright (c) 2024 BayLibre, SAS. + * Author: Jerome Brunet <jbrunet@baylibre.com> + */ + +#ifndef __MESON_RESET_H +#define __MESON_RESET_H + +#include <linux/module.h> +#include <linux/regmap.h> +#include <linux/reset-controller.h> + +struct meson_reset_param { + const struct reset_control_ops *reset_ops; + unsigned int reset_num; + unsigned int reset_offset; + unsigned int level_offset; + bool level_low_reset; +}; + +int meson_reset_controller_register(struct device *dev, struct regmap *map, + const struct meson_reset_param *param); + +extern const struct reset_control_ops meson_reset_ops; +extern const struct reset_control_ops meson_reset_toggle_ops; + +#endif /* __MESON_RESET_H */ |
