1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (C) 2006-2007 PA Semi, Inc
5  * Common functions for DMA access on PA Semi PWRficient
41 /* pasemi_read_iob_reg - read IOB register
50 /* pasemi_write_iob_reg - write IOB register
60 /* pasemi_read_mac_reg - read MAC register
70 /* pasemi_write_mac_reg - write MAC register
81 /* pasemi_read_dma_reg - read DMA register
90 /* pasemi_write_dma_reg - write DMA register
122 		return -ENOSPC;  in pasemi_alloc_tx_chan()
141 		return -ENOSPC;  in pasemi_alloc_rx_chan()
154 /* pasemi_dma_alloc_chan - Allocate a DMA channel
184 	chan->priv = buf;  in pasemi_dma_alloc_chan()
189 		chan->chno = chno;  in pasemi_dma_alloc_chan()
190 		chan->irq = irq_create_mapping(NULL,  in pasemi_dma_alloc_chan()
192 		chan->status = &dma_status->rx_sta[chno];  in pasemi_dma_alloc_chan()
196 		chan->chno = chno;  in pasemi_dma_alloc_chan()
197 		chan->irq = irq_create_mapping(NULL, base_hw_irq + chno);  in pasemi_dma_alloc_chan()
198 		chan->status = &dma_status->tx_sta[chno];  in pasemi_dma_alloc_chan()
202 	chan->chan_type = type;  in pasemi_dma_alloc_chan()
208 /* pasemi_dma_free_chan - Free a previously allocated channel
216 	if (chan->ring_virt)  in pasemi_dma_free_chan()
219 	switch (chan->chan_type & (RXCHAN|TXCHAN)) {  in pasemi_dma_free_chan()
221 		pasemi_free_rx_chan(chan->chno);  in pasemi_dma_free_chan()
224 		pasemi_free_tx_chan(chan->chno);  in pasemi_dma_free_chan()
228 	kfree(chan->priv);  in pasemi_dma_free_chan()
232 /* pasemi_dma_alloc_ring - Allocate descriptor ring for a channel
234  * @ring_size: Ring size in 64-bit (8-byte) words
242 	BUG_ON(chan->ring_virt);  in pasemi_dma_alloc_ring()
244 	chan->ring_size = ring_size;  in pasemi_dma_alloc_ring()
246 	chan->ring_virt = dma_alloc_coherent(&dma_pdev->dev,  in pasemi_dma_alloc_ring()
248 					     &chan->ring_dma, GFP_KERNEL);  in pasemi_dma_alloc_ring()
250 	if (!chan->ring_virt)  in pasemi_dma_alloc_ring()
251 		return -ENOMEM;  in pasemi_dma_alloc_ring()
257 /* pasemi_dma_free_ring - Free an allocated descriptor ring for a channel
264 	BUG_ON(!chan->ring_virt);  in pasemi_dma_free_ring()
266 	dma_free_coherent(&dma_pdev->dev, chan->ring_size * sizeof(u64),  in pasemi_dma_free_ring()
267 			  chan->ring_virt, chan->ring_dma);  in pasemi_dma_free_ring()
268 	chan->ring_virt = NULL;  in pasemi_dma_free_ring()
269 	chan->ring_size = 0;  in pasemi_dma_free_ring()
270 	chan->ring_dma = 0;  in pasemi_dma_free_ring()
274 /* pasemi_dma_start_chan - Start a DMA channel
282 	if (chan->chan_type == RXCHAN)  in pasemi_dma_start_chan()
283 		pasemi_write_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(chan->chno),  in pasemi_dma_start_chan()
286 		pasemi_write_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(chan->chno),  in pasemi_dma_start_chan()
291 /* pasemi_dma_stop_chan - Stop a DMA channel
295  * CMDSTA register and waiting on the ACT (active) bit to clear, then
309 	if (chan->chan_type == RXCHAN) {  in pasemi_dma_stop_chan()
310 		reg = PAS_DMA_RXCHAN_CCMDSTA(chan->chno);  in pasemi_dma_stop_chan()
321 		reg = PAS_DMA_TXCHAN_TCMDSTA(chan->chno);  in pasemi_dma_stop_chan()
337 /* pasemi_dma_alloc_buf - Allocate a buffer to use for DMA
350 	return dma_alloc_coherent(&dma_pdev->dev, size, handle, GFP_KERNEL);  in pasemi_dma_alloc_buf()
354 /* pasemi_dma_free_buf - Free a buffer used for DMA
364 	dma_free_coherent(&dma_pdev->dev, size, handle, GFP_KERNEL);  in pasemi_dma_free_buf()
368 /* pasemi_dma_alloc_flag - Allocate a flag (event) for channel synchronization
371  * Returns allocated flag (0-63), < 0 on error.
380 		return -ENOSPC;  in pasemi_dma_alloc_flag()
389 /* pasemi_dma_free_flag - Deallocates a flag (event)
403 /* pasemi_dma_set_flag - Sets a flag (event) to 1
404  * @flag: Flag number to set active
418 /* pasemi_dma_clear_flag - Sets a flag (event) to 0
433 /* pasemi_dma_alloc_fun - Allocate a function engine
436  * Returns allocated engine (0-8), < 0 on error.
445 		return -ENOSPC;  in pasemi_dma_alloc_fun()
454 /* pasemi_dma_free_fun - Deallocates a function engine
485 	 * they are at well-known locations so we can just do the math here.  in map_onedev()
487 	return ioremap(0xe0000000 + (p->devfn << 12), 0x2000);  in map_onedev()
490 /* pasemi_dma_init - Initialize the PA Semi DMA library
509 		return -ENODEV;  in pasemi_dma_init()
521 		err = -ENODEV;  in pasemi_dma_init()
530 		err = -ENODEV;  in pasemi_dma_init()
534 	base_hw_irq = virq_to_hw(dma_pdev->irq);  in pasemi_dma_init()
612 	pr_info("PA Semi PWRficient DMA library initialized "  in pasemi_dma_init()