diff options
Diffstat (limited to 'drivers/reset/reset-meson-audio-arb.c')
| -rw-r--r-- | drivers/reset/reset-meson-audio-arb.c | 168 |
1 files changed, 0 insertions, 168 deletions
diff --git a/drivers/reset/reset-meson-audio-arb.c b/drivers/reset/reset-meson-audio-arb.c deleted file mode 100644 index 91751617b37a..000000000000 --- a/drivers/reset/reset-meson-audio-arb.c +++ /dev/null @@ -1,168 +0,0 @@ -// 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_platform.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; -}; - -#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 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", }, - {} -}; -MODULE_DEVICE_TABLE(of, meson_audio_arb_of_match); - -static int 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); - - clk_disable_unprepare(arb->clk); - - return 0; -} - -static int meson_audio_arb_probe(struct platform_device *pdev) -{ - struct device *dev = &pdev->dev; - struct meson_audio_arb_data *arb; - struct resource *res; - int ret; - - arb = devm_kzalloc(dev, sizeof(*arb), GFP_KERNEL); - if (!arb) - return -ENOMEM; - platform_set_drvdata(pdev, arb); - - arb->clk = devm_clk_get(dev, NULL); - if (IS_ERR(arb->clk)) { - if (PTR_ERR(arb->clk) != -EPROBE_DEFER) - dev_err(dev, "failed to get clock\n"); - return PTR_ERR(arb->clk); - } - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - arb->regs = devm_ioremap_resource(dev, res); - if (IS_ERR(arb->regs)) - return PTR_ERR(arb->regs); - - spin_lock_init(&arb->lock); - arb->reset_bits = axg_audio_arb_reset_bits; - arb->rstc.nr_resets = ARRAY_SIZE(axg_audio_arb_reset_bits); - arb->rstc.ops = &meson_audio_arb_rstc_ops; - arb->rstc.of_node = dev->of_node; - - /* - * Enable general : - * In the initial state, all memory interfaces are disabled - * and the general bit is on - */ - ret = clk_prepare_enable(arb->clk); - if (ret) { - dev_err(dev, "failed to enable arb clock\n"); - return ret; - } - 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"); |