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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Direct Memory Access U-Class Simulation driver
- *
- * Copyright (C) 2018 Texas Instruments Incorporated <www.ti.com>
- *
- * Author: Grygorii Strashko <grygorii.strashko@ti.com>
- */
- #include <common.h>
- #include <dm.h>
- #include <dm/read.h>
- #include <dma-uclass.h>
- #include <dt-structs.h>
- #include <errno.h>
- #define SANDBOX_DMA_CH_CNT 3
- #define SANDBOX_DMA_BUF_SIZE 1024
- struct sandbox_dma_chan {
- struct sandbox_dma_dev *ud;
- char name[20];
- u32 id;
- enum dma_direction dir;
- bool in_use;
- bool enabled;
- };
- struct sandbox_dma_dev {
- struct device *dev;
- u32 ch_count;
- struct sandbox_dma_chan channels[SANDBOX_DMA_CH_CNT];
- uchar buf[SANDBOX_DMA_BUF_SIZE];
- uchar *buf_rx;
- size_t data_len;
- u32 meta;
- };
- static int sandbox_dma_transfer(struct udevice *dev, int direction,
- void *dst, void *src, size_t len)
- {
- memcpy(dst, src, len);
- return 0;
- }
- static int sandbox_dma_of_xlate(struct dma *dma,
- struct ofnode_phandle_args *args)
- {
- struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
- struct sandbox_dma_chan *uc;
- debug("%s(dma id=%u)\n", __func__, args->args[0]);
- if (args->args[0] >= SANDBOX_DMA_CH_CNT)
- return -EINVAL;
- dma->id = args->args[0];
- uc = &ud->channels[dma->id];
- if (dma->id == 1)
- uc->dir = DMA_MEM_TO_DEV;
- else if (dma->id == 2)
- uc->dir = DMA_DEV_TO_MEM;
- else
- uc->dir = DMA_MEM_TO_MEM;
- debug("%s(dma id=%lu dir=%d)\n", __func__, dma->id, uc->dir);
- return 0;
- }
- static int sandbox_dma_request(struct dma *dma)
- {
- struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
- struct sandbox_dma_chan *uc;
- if (dma->id >= SANDBOX_DMA_CH_CNT)
- return -EINVAL;
- uc = &ud->channels[dma->id];
- if (uc->in_use)
- return -EBUSY;
- uc->in_use = true;
- debug("%s(dma id=%lu in_use=%d)\n", __func__, dma->id, uc->in_use);
- return 0;
- }
- static int sandbox_dma_rfree(struct dma *dma)
- {
- struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
- struct sandbox_dma_chan *uc;
- if (dma->id >= SANDBOX_DMA_CH_CNT)
- return -EINVAL;
- uc = &ud->channels[dma->id];
- if (!uc->in_use)
- return -EINVAL;
- uc->in_use = false;
- ud->buf_rx = NULL;
- ud->data_len = 0;
- debug("%s(dma id=%lu in_use=%d)\n", __func__, dma->id, uc->in_use);
- return 0;
- }
- static int sandbox_dma_enable(struct dma *dma)
- {
- struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
- struct sandbox_dma_chan *uc;
- if (dma->id >= SANDBOX_DMA_CH_CNT)
- return -EINVAL;
- uc = &ud->channels[dma->id];
- if (!uc->in_use)
- return -EINVAL;
- if (uc->enabled)
- return -EINVAL;
- uc->enabled = true;
- debug("%s(dma id=%lu enabled=%d)\n", __func__, dma->id, uc->enabled);
- return 0;
- }
- static int sandbox_dma_disable(struct dma *dma)
- {
- struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
- struct sandbox_dma_chan *uc;
- if (dma->id >= SANDBOX_DMA_CH_CNT)
- return -EINVAL;
- uc = &ud->channels[dma->id];
- if (!uc->in_use)
- return -EINVAL;
- if (!uc->enabled)
- return -EINVAL;
- uc->enabled = false;
- debug("%s(dma id=%lu enabled=%d)\n", __func__, dma->id, uc->enabled);
- return 0;
- }
- static int sandbox_dma_send(struct dma *dma,
- void *src, size_t len, void *metadata)
- {
- struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
- struct sandbox_dma_chan *uc;
- if (dma->id >= SANDBOX_DMA_CH_CNT)
- return -EINVAL;
- if (!src || !metadata)
- return -EINVAL;
- debug("%s(dma id=%lu)\n", __func__, dma->id);
- uc = &ud->channels[dma->id];
- if (uc->dir != DMA_MEM_TO_DEV)
- return -EINVAL;
- if (!uc->in_use)
- return -EINVAL;
- if (!uc->enabled)
- return -EINVAL;
- if (len >= SANDBOX_DMA_BUF_SIZE)
- return -EINVAL;
- memcpy(ud->buf, src, len);
- ud->data_len = len;
- ud->meta = *((u32 *)metadata);
- debug("%s(dma id=%lu len=%zu meta=%08x)\n",
- __func__, dma->id, len, ud->meta);
- return 0;
- }
- static int sandbox_dma_receive(struct dma *dma, void **dst, void *metadata)
- {
- struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
- struct sandbox_dma_chan *uc;
- if (dma->id >= SANDBOX_DMA_CH_CNT)
- return -EINVAL;
- if (!dst || !metadata)
- return -EINVAL;
- uc = &ud->channels[dma->id];
- if (uc->dir != DMA_DEV_TO_MEM)
- return -EINVAL;
- if (!uc->in_use)
- return -EINVAL;
- if (!uc->enabled)
- return -EINVAL;
- if (!ud->data_len)
- return 0;
- if (ud->buf_rx) {
- memcpy(ud->buf_rx, ud->buf, ud->data_len);
- *dst = ud->buf_rx;
- } else {
- memcpy(*dst, ud->buf, ud->data_len);
- }
- *((u32 *)metadata) = ud->meta;
- debug("%s(dma id=%lu len=%zu meta=%08x %p)\n",
- __func__, dma->id, ud->data_len, ud->meta, *dst);
- return ud->data_len;
- }
- static int sandbox_dma_prepare_rcv_buf(struct dma *dma, void *dst, size_t size)
- {
- struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
- ud->buf_rx = dst;
- return 0;
- }
- static const struct dma_ops sandbox_dma_ops = {
- .transfer = sandbox_dma_transfer,
- .of_xlate = sandbox_dma_of_xlate,
- .request = sandbox_dma_request,
- .rfree = sandbox_dma_rfree,
- .enable = sandbox_dma_enable,
- .disable = sandbox_dma_disable,
- .send = sandbox_dma_send,
- .receive = sandbox_dma_receive,
- .prepare_rcv_buf = sandbox_dma_prepare_rcv_buf,
- };
- static int sandbox_dma_probe(struct udevice *dev)
- {
- struct dma_dev_priv *uc_priv = dev_get_uclass_priv(dev);
- struct sandbox_dma_dev *ud = dev_get_priv(dev);
- int i, ret = 0;
- uc_priv->supported = DMA_SUPPORTS_MEM_TO_MEM |
- DMA_SUPPORTS_MEM_TO_DEV |
- DMA_SUPPORTS_DEV_TO_MEM;
- ud->ch_count = SANDBOX_DMA_CH_CNT;
- ud->buf_rx = NULL;
- ud->meta = 0;
- ud->data_len = 0;
- pr_err("Number of channels: %u\n", ud->ch_count);
- for (i = 0; i < ud->ch_count; i++) {
- struct sandbox_dma_chan *uc = &ud->channels[i];
- uc->ud = ud;
- uc->id = i;
- sprintf(uc->name, "DMA chan%d\n", i);
- uc->in_use = false;
- uc->enabled = false;
- }
- return ret;
- }
- static const struct udevice_id sandbox_dma_ids[] = {
- { .compatible = "sandbox,dma" },
- { }
- };
- U_BOOT_DRIVER(sandbox_dma) = {
- .name = "sandbox-dma",
- .id = UCLASS_DMA,
- .of_match = sandbox_dma_ids,
- .ops = &sandbox_dma_ops,
- .probe = sandbox_dma_probe,
- .priv_auto_alloc_size = sizeof(struct sandbox_dma_dev),
- };
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