// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) Rockchip Electronics Co.Ltd
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* Author: Felix Zeng <felix.zeng@rock-chips.com>
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*/
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#include <linux/delay.h>
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#include <linux/iommu.h>
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#include "rknpu_reset.h"
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#ifndef FPGA_PLATFORM
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static inline struct reset_control *rknpu_reset_control_get(struct device *dev,
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const char *name)
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{
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struct reset_control *rst = NULL;
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rst = devm_reset_control_get(dev, name);
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if (IS_ERR(rst))
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LOG_DEV_ERROR(dev,
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"failed to get rknpu reset control: %s, %ld\n",
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name, PTR_ERR(rst));
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return rst;
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}
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#endif
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int rknpu_reset_get(struct rknpu_device *rknpu_dev)
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{
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#ifndef FPGA_PLATFORM
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struct reset_control *srst_a = NULL;
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struct reset_control *srst_h = NULL;
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int i = 0;
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for (i = 0; i < rknpu_dev->config->num_resets; i++) {
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srst_a = rknpu_reset_control_get(
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rknpu_dev->dev,
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rknpu_dev->config->resets[i].srst_a_name);
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if (IS_ERR(srst_a))
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return PTR_ERR(srst_a);
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rknpu_dev->srst_a[i] = srst_a;
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srst_h = rknpu_reset_control_get(
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rknpu_dev->dev,
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rknpu_dev->config->resets[i].srst_h_name);
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if (IS_ERR(srst_h))
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return PTR_ERR(srst_h);
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rknpu_dev->srst_h[i] = srst_h;
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}
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#endif
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return 0;
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}
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#ifndef FPGA_PLATFORM
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static int rknpu_reset_assert(struct reset_control *rst)
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{
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int ret = -EINVAL;
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if (!rst)
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return -EINVAL;
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ret = reset_control_assert(rst);
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if (ret < 0) {
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LOG_ERROR("failed to assert rknpu reset: %d\n", ret);
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return ret;
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}
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return 0;
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}
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static int rknpu_reset_deassert(struct reset_control *rst)
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{
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int ret = -EINVAL;
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if (!rst)
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return -EINVAL;
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ret = reset_control_deassert(rst);
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if (ret < 0) {
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LOG_ERROR("failed to deassert rknpu reset: %d\n", ret);
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return ret;
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}
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return 0;
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}
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#endif
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int rknpu_soft_reset(struct rknpu_device *rknpu_dev)
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{
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#ifndef FPGA_PLATFORM
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struct iommu_domain *domain = NULL;
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struct rknpu_subcore_data *subcore_data = NULL;
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int ret = -EINVAL, i = 0;
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if (rknpu_dev->bypass_soft_reset) {
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LOG_WARN("bypass soft reset\n");
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return 0;
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}
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if (!mutex_trylock(&rknpu_dev->reset_lock))
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return 0;
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rknpu_dev->soft_reseting = true;
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msleep(100);
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for (i = 0; i < rknpu_dev->config->num_irqs; ++i) {
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subcore_data = &rknpu_dev->subcore_datas[i];
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wake_up(&subcore_data->job_done_wq);
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}
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LOG_INFO("soft reset\n");
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for (i = 0; i < rknpu_dev->config->num_resets; i++) {
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ret = rknpu_reset_assert(rknpu_dev->srst_a[i]);
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ret |= rknpu_reset_assert(rknpu_dev->srst_h[i]);
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udelay(10);
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ret |= rknpu_reset_deassert(rknpu_dev->srst_a[i]);
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ret |= rknpu_reset_deassert(rknpu_dev->srst_h[i]);
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}
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if (ret) {
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LOG_DEV_ERROR(rknpu_dev->dev,
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"failed to soft reset for rknpu: %d\n", ret);
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mutex_unlock(&rknpu_dev->reset_lock);
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return ret;
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}
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if (rknpu_dev->iommu_en)
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domain = iommu_get_domain_for_dev(rknpu_dev->dev);
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if (domain) {
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iommu_detach_device(domain, rknpu_dev->dev);
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iommu_attach_device(domain, rknpu_dev->dev);
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}
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rknpu_dev->soft_reseting = false;
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mutex_unlock(&rknpu_dev->reset_lock);
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#endif
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return 0;
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}
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