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
43 /* pasemi_read_iob_reg - read IOB register
52 /* pasemi_write_iob_reg - write IOB register
62 /* pasemi_read_mac_reg - read MAC register
72 /* pasemi_write_mac_reg - write MAC register
83 /* pasemi_read_dma_reg - read DMA register
92 /* pasemi_write_dma_reg - write DMA register
124 		return -ENOSPC;  in pasemi_alloc_tx_chan()
143 		return -ENOSPC;  in pasemi_alloc_rx_chan()
156 /* pasemi_dma_alloc_chan - Allocate a DMA channel
186 	chan->priv = buf;  in pasemi_dma_alloc_chan()
191 		chan->chno = chno;  in pasemi_dma_alloc_chan()
192 		chan->irq = irq_create_mapping(NULL,  in pasemi_dma_alloc_chan()
194 		chan->status = &dma_status->rx_sta[chno];  in pasemi_dma_alloc_chan()
198 		chan->chno = chno;  in pasemi_dma_alloc_chan()
199 		chan->irq = irq_create_mapping(NULL, base_hw_irq + chno);  in pasemi_dma_alloc_chan()
200 		chan->status = &dma_status->tx_sta[chno];  in pasemi_dma_alloc_chan()
204 	chan->chan_type = type;  in pasemi_dma_alloc_chan()
210 /* pasemi_dma_free_chan - Free a previously allocated channel
218 	if (chan->ring_virt)  in pasemi_dma_free_chan()
221 	switch (chan->chan_type & (RXCHAN|TXCHAN)) {  in pasemi_dma_free_chan()
223 		pasemi_free_rx_chan(chan->chno);  in pasemi_dma_free_chan()
226 		pasemi_free_tx_chan(chan->chno);  in pasemi_dma_free_chan()
230 	kfree(chan->priv);  in pasemi_dma_free_chan()
234 /* pasemi_dma_alloc_ring - Allocate descriptor ring for a channel
236  * @ring_size: Ring size in 64-bit (8-byte) words
244 	BUG_ON(chan->ring_virt);  in pasemi_dma_alloc_ring()
246 	chan->ring_size = ring_size;  in pasemi_dma_alloc_ring()
248 	chan->ring_virt = dma_alloc_coherent(&dma_pdev->dev,  in pasemi_dma_alloc_ring()
250 					     &chan->ring_dma, GFP_KERNEL);  in pasemi_dma_alloc_ring()
252 	if (!chan->ring_virt)  in pasemi_dma_alloc_ring()
253 		return -ENOMEM;  in pasemi_dma_alloc_ring()
259 /* pasemi_dma_free_ring - Free an allocated descriptor ring for a channel
266 	BUG_ON(!chan->ring_virt);  in pasemi_dma_free_ring()
268 	dma_free_coherent(&dma_pdev->dev, chan->ring_size * sizeof(u64),  in pasemi_dma_free_ring()
269 			  chan->ring_virt, chan->ring_dma);  in pasemi_dma_free_ring()
270 	chan->ring_virt = NULL;  in pasemi_dma_free_ring()
271 	chan->ring_size = 0;  in pasemi_dma_free_ring()
272 	chan->ring_dma = 0;  in pasemi_dma_free_ring()
276 /* pasemi_dma_start_chan - Start a DMA channel
284 	if (chan->chan_type == RXCHAN)  in pasemi_dma_start_chan()
285 		pasemi_write_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(chan->chno),  in pasemi_dma_start_chan()
288 		pasemi_write_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(chan->chno),  in pasemi_dma_start_chan()
293 /* pasemi_dma_stop_chan - Stop a DMA channel
297  * CMDSTA register and waiting on the ACT (active) bit to clear, then
311 	if (chan->chan_type == RXCHAN) {  in pasemi_dma_stop_chan()
312 		reg = PAS_DMA_RXCHAN_CCMDSTA(chan->chno);  in pasemi_dma_stop_chan()
323 		reg = PAS_DMA_TXCHAN_TCMDSTA(chan->chno);  in pasemi_dma_stop_chan()
339 /* pasemi_dma_alloc_buf - Allocate a buffer to use for DMA
352 	return dma_alloc_coherent(&dma_pdev->dev, size, handle, GFP_KERNEL);  in pasemi_dma_alloc_buf()
356 /* pasemi_dma_free_buf - Free a buffer used for DMA
366 	dma_free_coherent(&dma_pdev->dev, size, handle, GFP_KERNEL);  in pasemi_dma_free_buf()
370 /* pasemi_dma_alloc_flag - Allocate a flag (event) for channel synchronization
373  * Returns allocated flag (0-63), < 0 on error.
382 		return -ENOSPC;  in pasemi_dma_alloc_flag()
391 /* pasemi_dma_free_flag - Deallocates a flag (event)
405 /* pasemi_dma_set_flag - Sets a flag (event) to 1
406  * @flag: Flag number to set active
420 /* pasemi_dma_clear_flag - Sets a flag (event) to 0
435 /* pasemi_dma_alloc_fun - Allocate a function engine
438  * Returns allocated engine (0-8), < 0 on error.
447 		return -ENOSPC;  in pasemi_dma_alloc_fun()
456 /* pasemi_dma_free_fun - Deallocates a function engine
487 	 * they are at well-known locations so we can just do the math here.  in map_onedev()
489 	return ioremap(0xe0000000 + (p->devfn << 12), 0x2000);  in map_onedev()
492 /* pasemi_dma_init - Initialize the PA Semi DMA library
511 		return -ENODEV;  in pasemi_dma_init()
523 		err = -ENODEV;  in pasemi_dma_init()
532 		err = -ENODEV;  in pasemi_dma_init()
536 	base_hw_irq = virq_to_hw(dma_pdev->irq);  in pasemi_dma_init()
614 	pr_info("PA Semi PWRficient DMA library initialized "  in pasemi_dma_init()