diff options
Diffstat (limited to 'drivers/reset/reset-meson.c')
| -rw-r--r-- | drivers/reset/reset-meson.c | 159 |
1 files changed, 0 insertions, 159 deletions
diff --git a/drivers/reset/reset-meson.c b/drivers/reset/reset-meson.c deleted file mode 100644 index 1e9fca3e30e8..000000000000 --- a/drivers/reset/reset-meson.c +++ /dev/null @@ -1,159 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause -/* - * Amlogic Meson Reset Controller driver - * - * Copyright (c) 2016 BayLibre, SAS. - * Author: Neil Armstrong <narmstrong@baylibre.com> - */ -#include <linux/err.h> -#include <linux/init.h> -#include <linux/io.h> -#include <linux/of.h> -#include <linux/module.h> -#include <linux/platform_device.h> -#include <linux/reset-controller.h> -#include <linux/slab.h> -#include <linux/types.h> - -#define BITS_PER_REG 32 - -struct meson_reset_param { - int reg_count; - int level_offset; -}; - -struct meson_reset { - void __iomem *reg_base; - const struct meson_reset_param *param; - struct reset_controller_dev rcdev; - spinlock_t lock; -}; - -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 bank = id / BITS_PER_REG; - unsigned int offset = id % BITS_PER_REG; - void __iomem *reg_addr = data->reg_base + (bank << 2); - - writel(BIT(offset), reg_addr); - - return 0; -} - -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 bank = id / BITS_PER_REG; - unsigned int offset = id % BITS_PER_REG; - void __iomem *reg_addr; - unsigned long flags; - u32 reg; - - reg_addr = data->reg_base + data->param->level_offset + (bank << 2); - - spin_lock_irqsave(&data->lock, flags); - - reg = readl(reg_addr); - if (assert) - writel(reg & ~BIT(offset), reg_addr); - else - writel(reg | BIT(offset), reg_addr); - - spin_unlock_irqrestore(&data->lock, flags); - - return 0; -} - -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 const struct reset_control_ops meson_reset_ops = { - .reset = meson_reset_reset, - .assert = meson_reset_assert, - .deassert = meson_reset_deassert, -}; - -static const struct meson_reset_param meson8b_param = { - .reg_count = 8, - .level_offset = 0x7c, -}; - -static const struct meson_reset_param meson_a1_param = { - .reg_count = 3, - .level_offset = 0x40, -}; - -static const struct meson_reset_param meson_s4_param = { - .reg_count = 6, - .level_offset = 0x40, -}; - -static const struct meson_reset_param t7_param = { - .reg_count = 7, - .level_offset = 0x40, -}; - -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 int meson_reset_probe(struct platform_device *pdev) -{ - struct meson_reset *data; - - data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); - if (!data) - return -ENOMEM; - - data->reg_base = devm_platform_ioremap_resource(pdev, 0); - if (IS_ERR(data->reg_base)) - return PTR_ERR(data->reg_base); - - data->param = of_device_get_match_data(&pdev->dev); - if (!data->param) - return -ENODEV; - - spin_lock_init(&data->lock); - - data->rcdev.owner = THIS_MODULE; - data->rcdev.nr_resets = data->param->reg_count * BITS_PER_REG; - data->rcdev.ops = &meson_reset_ops; - data->rcdev.of_node = pdev->dev.of_node; - - return devm_reset_controller_register(&pdev->dev, &data->rcdev); -} - -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_LICENSE("Dual BSD/GPL"); |