mirror of
https://github.com/brain-hackers/u-boot-brain
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![Simon Glass](/assets/img/avatar_default.png)
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
285 lines
5.9 KiB
C
285 lines
5.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Direct Memory Access U-Class Simulation driver
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*
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* Copyright (C) 2018 Texas Instruments Incorporated <www.ti.com>
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*
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* Author: Grygorii Strashko <grygorii.strashko@ti.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <log.h>
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#include <malloc.h>
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#include <dm/read.h>
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#include <dma-uclass.h>
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#include <dt-structs.h>
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#include <errno.h>
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#define SANDBOX_DMA_CH_CNT 3
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#define SANDBOX_DMA_BUF_SIZE 1024
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struct sandbox_dma_chan {
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struct sandbox_dma_dev *ud;
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char name[20];
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u32 id;
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enum dma_direction dir;
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bool in_use;
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bool enabled;
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};
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struct sandbox_dma_dev {
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struct device *dev;
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u32 ch_count;
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struct sandbox_dma_chan channels[SANDBOX_DMA_CH_CNT];
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uchar buf[SANDBOX_DMA_BUF_SIZE];
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uchar *buf_rx;
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size_t data_len;
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u32 meta;
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};
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static int sandbox_dma_transfer(struct udevice *dev, int direction,
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void *dst, void *src, size_t len)
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{
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memcpy(dst, src, len);
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return 0;
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}
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static int sandbox_dma_of_xlate(struct dma *dma,
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struct ofnode_phandle_args *args)
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{
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struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
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struct sandbox_dma_chan *uc;
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debug("%s(dma id=%u)\n", __func__, args->args[0]);
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if (args->args[0] >= SANDBOX_DMA_CH_CNT)
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return -EINVAL;
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dma->id = args->args[0];
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uc = &ud->channels[dma->id];
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if (dma->id == 1)
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uc->dir = DMA_MEM_TO_DEV;
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else if (dma->id == 2)
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uc->dir = DMA_DEV_TO_MEM;
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else
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uc->dir = DMA_MEM_TO_MEM;
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debug("%s(dma id=%lu dir=%d)\n", __func__, dma->id, uc->dir);
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return 0;
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}
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static int sandbox_dma_request(struct dma *dma)
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{
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struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
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struct sandbox_dma_chan *uc;
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if (dma->id >= SANDBOX_DMA_CH_CNT)
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return -EINVAL;
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uc = &ud->channels[dma->id];
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if (uc->in_use)
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return -EBUSY;
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uc->in_use = true;
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debug("%s(dma id=%lu in_use=%d)\n", __func__, dma->id, uc->in_use);
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return 0;
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}
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static int sandbox_dma_rfree(struct dma *dma)
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{
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struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
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struct sandbox_dma_chan *uc;
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if (dma->id >= SANDBOX_DMA_CH_CNT)
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return -EINVAL;
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uc = &ud->channels[dma->id];
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if (!uc->in_use)
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return -EINVAL;
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uc->in_use = false;
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ud->buf_rx = NULL;
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ud->data_len = 0;
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debug("%s(dma id=%lu in_use=%d)\n", __func__, dma->id, uc->in_use);
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return 0;
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}
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static int sandbox_dma_enable(struct dma *dma)
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{
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struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
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struct sandbox_dma_chan *uc;
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if (dma->id >= SANDBOX_DMA_CH_CNT)
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return -EINVAL;
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uc = &ud->channels[dma->id];
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if (!uc->in_use)
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return -EINVAL;
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if (uc->enabled)
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return -EINVAL;
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uc->enabled = true;
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debug("%s(dma id=%lu enabled=%d)\n", __func__, dma->id, uc->enabled);
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return 0;
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}
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static int sandbox_dma_disable(struct dma *dma)
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{
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struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
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struct sandbox_dma_chan *uc;
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if (dma->id >= SANDBOX_DMA_CH_CNT)
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return -EINVAL;
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uc = &ud->channels[dma->id];
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if (!uc->in_use)
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return -EINVAL;
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if (!uc->enabled)
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return -EINVAL;
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uc->enabled = false;
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debug("%s(dma id=%lu enabled=%d)\n", __func__, dma->id, uc->enabled);
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return 0;
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}
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static int sandbox_dma_send(struct dma *dma,
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void *src, size_t len, void *metadata)
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{
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struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
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struct sandbox_dma_chan *uc;
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if (dma->id >= SANDBOX_DMA_CH_CNT)
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return -EINVAL;
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if (!src || !metadata)
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return -EINVAL;
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debug("%s(dma id=%lu)\n", __func__, dma->id);
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uc = &ud->channels[dma->id];
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if (uc->dir != DMA_MEM_TO_DEV)
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return -EINVAL;
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if (!uc->in_use)
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return -EINVAL;
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if (!uc->enabled)
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return -EINVAL;
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if (len >= SANDBOX_DMA_BUF_SIZE)
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return -EINVAL;
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memcpy(ud->buf, src, len);
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ud->data_len = len;
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ud->meta = *((u32 *)metadata);
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debug("%s(dma id=%lu len=%zu meta=%08x)\n",
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__func__, dma->id, len, ud->meta);
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return 0;
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}
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static int sandbox_dma_receive(struct dma *dma, void **dst, void *metadata)
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{
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struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
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struct sandbox_dma_chan *uc;
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if (dma->id >= SANDBOX_DMA_CH_CNT)
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return -EINVAL;
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if (!dst || !metadata)
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return -EINVAL;
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uc = &ud->channels[dma->id];
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if (uc->dir != DMA_DEV_TO_MEM)
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return -EINVAL;
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if (!uc->in_use)
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return -EINVAL;
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if (!uc->enabled)
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return -EINVAL;
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if (!ud->data_len)
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return 0;
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if (ud->buf_rx) {
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memcpy(ud->buf_rx, ud->buf, ud->data_len);
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*dst = ud->buf_rx;
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} else {
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memcpy(*dst, ud->buf, ud->data_len);
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}
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*((u32 *)metadata) = ud->meta;
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debug("%s(dma id=%lu len=%zu meta=%08x %p)\n",
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__func__, dma->id, ud->data_len, ud->meta, *dst);
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return ud->data_len;
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}
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static int sandbox_dma_prepare_rcv_buf(struct dma *dma, void *dst, size_t size)
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{
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struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
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ud->buf_rx = dst;
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return 0;
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}
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static const struct dma_ops sandbox_dma_ops = {
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.transfer = sandbox_dma_transfer,
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.of_xlate = sandbox_dma_of_xlate,
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.request = sandbox_dma_request,
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.rfree = sandbox_dma_rfree,
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.enable = sandbox_dma_enable,
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.disable = sandbox_dma_disable,
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.send = sandbox_dma_send,
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.receive = sandbox_dma_receive,
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.prepare_rcv_buf = sandbox_dma_prepare_rcv_buf,
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};
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static int sandbox_dma_probe(struct udevice *dev)
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{
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struct dma_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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struct sandbox_dma_dev *ud = dev_get_priv(dev);
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int i, ret = 0;
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uc_priv->supported = DMA_SUPPORTS_MEM_TO_MEM |
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DMA_SUPPORTS_MEM_TO_DEV |
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DMA_SUPPORTS_DEV_TO_MEM;
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ud->ch_count = SANDBOX_DMA_CH_CNT;
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ud->buf_rx = NULL;
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ud->meta = 0;
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ud->data_len = 0;
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pr_err("Number of channels: %u\n", ud->ch_count);
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for (i = 0; i < ud->ch_count; i++) {
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struct sandbox_dma_chan *uc = &ud->channels[i];
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uc->ud = ud;
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uc->id = i;
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sprintf(uc->name, "DMA chan%d\n", i);
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uc->in_use = false;
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uc->enabled = false;
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}
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return ret;
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}
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static const struct udevice_id sandbox_dma_ids[] = {
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{ .compatible = "sandbox,dma" },
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{ }
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};
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U_BOOT_DRIVER(sandbox_dma) = {
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.name = "sandbox-dma",
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.id = UCLASS_DMA,
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.of_match = sandbox_dma_ids,
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.ops = &sandbox_dma_ops,
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.probe = sandbox_dma_probe,
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.priv_auto = sizeof(struct sandbox_dma_dev),
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};
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