mmc: renesas-sdhi: rename tmio_mmc_dma.c => renesas_sdhi_sys_dmac.c

Rename the source file for DMA for SDHI as a follow-up to attaching
DMA code to the SDHI driver rather than the tmio_core driver.

The name "renesas" is chosen as the SDHI driver is applicable to a wider
range of SoCs than SH-Mobile it seems to be a more appropriate name.
However, the SDHI driver source itself, is left as sh_mobile_sdhi to
avoid unnecessary churn.

The name sys_dmac was chosen to reflect the type of DMA used.

Internal symbols have also been renamed to reflect the filename change.

A follow-up patch will re-organise the SDHI driver removing
the need for renesas_sdhi_get_dma_ops().

Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

1 files changed, 0 insertions, 368 deletions

diff --git a/drivers/mmc/host/tmio_mmc_dma.c b/drivers/mmc/host/tmio_mmc_dma.c
deleted file mode 100644
index 537ee4ad8b60..000000000000
--- a/drivers/mmc/host/tmio_mmc_dma.c
+++ /dev/null
@@ -1,368 +0,0 @@
-/*
- * DMA function for TMIO MMC implementations
- *
- * Copyright (C) 2010-2011 Guennadi Liakhovetski
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/device.h>
-#include <linux/dma-mapping.h>
-#include <linux/dmaengine.h>
-#include <linux/mfd/tmio.h>
-#include <linux/mmc/host.h>
-#include <linux/pagemap.h>
-#include <linux/scatterlist.h>
-
-#include "tmio_mmc.h"
-
-#define TMIO_MMC_MIN_DMA_LEN 8
-
-static void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable)
-{
-	if (!host->chan_tx || !host->chan_rx)
-		return;
-
-	if (host->dma->enable)
-		host->dma->enable(host, enable);
-}
-
-static void tmio_mmc_abort_dma(struct tmio_mmc_host *host)
-{
-	tmio_mmc_enable_dma(host, false);
-
-	if (host->chan_rx)
-		dmaengine_terminate_all(host->chan_rx);
-	if (host->chan_tx)
-		dmaengine_terminate_all(host->chan_tx);
-
-	tmio_mmc_enable_dma(host, true);
-}
-
-static void tmio_mmc_dma_callback(void *arg)
-{
-	struct tmio_mmc_host *host = arg;
-
-	spin_lock_irq(&host->lock);
-
-	if (!host->data)
-		goto out;
-
-	if (host->data->flags & MMC_DATA_READ)
-		dma_unmap_sg(host->chan_rx->device->dev,
-			     host->sg_ptr, host->sg_len,
-			     DMA_FROM_DEVICE);
-	else
-		dma_unmap_sg(host->chan_tx->device->dev,
-			     host->sg_ptr, host->sg_len,
-			     DMA_TO_DEVICE);
-
-	spin_unlock_irq(&host->lock);
-
-	wait_for_completion(&host->dma_dataend);
-
-	spin_lock_irq(&host->lock);
-	tmio_mmc_do_data_irq(host);
-out:
-	spin_unlock_irq(&host->lock);
-}
-
-static void tmio_mmc_start_dma_rx(struct tmio_mmc_host *host)
-{
-	struct scatterlist *sg = host->sg_ptr, *sg_tmp;
-	struct dma_async_tx_descriptor *desc = NULL;
-	struct dma_chan *chan = host->chan_rx;
-	dma_cookie_t cookie;
-	int ret, i;
-	bool aligned = true, multiple = true;
-	unsigned int align = (1 << host->pdata->alignment_shift) - 1;
-
-	for_each_sg(sg, sg_tmp, host->sg_len, i) {
-		if (sg_tmp->offset & align)
-			aligned = false;
-		if (sg_tmp->length & align) {
-			multiple = false;
-			break;
-		}
-	}
-
-	if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_SIZE ||
-			  (align & PAGE_MASK))) || !multiple) {
-		ret = -EINVAL;
-		goto pio;
-	}
-
-	if (sg->length < TMIO_MMC_MIN_DMA_LEN) {
-		host->force_pio = true;
-		return;
-	}
-
-	tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_RXRDY);
-
-	/* The only sg element can be unaligned, use our bounce buffer then */
-	if (!aligned) {
-		sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length);
-		host->sg_ptr = &host->bounce_sg;
-		sg = host->sg_ptr;
-	}
-
-	ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_FROM_DEVICE);
-	if (ret > 0)
-		desc = dmaengine_prep_slave_sg(chan, sg, ret,
-			DMA_DEV_TO_MEM, DMA_CTRL_ACK);
-
-	if (desc) {
-		reinit_completion(&host->dma_dataend);
-		desc->callback = tmio_mmc_dma_callback;
-		desc->callback_param = host;
-
-		cookie = dmaengine_submit(desc);
-		if (cookie < 0) {
-			desc = NULL;
-			ret = cookie;
-		}
-	}
-pio:
-	if (!desc) {
-		/* DMA failed, fall back to PIO */
-		tmio_mmc_enable_dma(host, false);
-		if (ret >= 0)
-			ret = -EIO;
-		host->chan_rx = NULL;
-		dma_release_channel(chan);
-		/* Free the Tx channel too */
-		chan = host->chan_tx;
-		if (chan) {
-			host->chan_tx = NULL;
-			dma_release_channel(chan);
-		}
-		dev_warn(&host->pdev->dev,
-			 "DMA failed: %d, falling back to PIO\n", ret);
-	}
-}
-
-static void tmio_mmc_start_dma_tx(struct tmio_mmc_host *host)
-{
-	struct scatterlist *sg = host->sg_ptr, *sg_tmp;
-	struct dma_async_tx_descriptor *desc = NULL;
-	struct dma_chan *chan = host->chan_tx;
-	dma_cookie_t cookie;
-	int ret, i;
-	bool aligned = true, multiple = true;
-	unsigned int align = (1 << host->pdata->alignment_shift) - 1;
-
-	for_each_sg(sg, sg_tmp, host->sg_len, i) {
-		if (sg_tmp->offset & align)
-			aligned = false;
-		if (sg_tmp->length & align) {
-			multiple = false;
-			break;
-		}
-	}
-
-	if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_SIZE ||
-			  (align & PAGE_MASK))) || !multiple) {
-		ret = -EINVAL;
-		goto pio;
-	}
-
-	if (sg->length < TMIO_MMC_MIN_DMA_LEN) {
-		host->force_pio = true;
-		return;
-	}
-
-	tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_TXRQ);
-
-	/* The only sg element can be unaligned, use our bounce buffer then */
-	if (!aligned) {
-		unsigned long flags;
-		void *sg_vaddr = tmio_mmc_kmap_atomic(sg, &flags);
-		sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length);
-		memcpy(host->bounce_buf, sg_vaddr, host->bounce_sg.length);
-		tmio_mmc_kunmap_atomic(sg, &flags, sg_vaddr);
-		host->sg_ptr = &host->bounce_sg;
-		sg = host->sg_ptr;
-	}
-
-	ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_TO_DEVICE);
-	if (ret > 0)
-		desc = dmaengine_prep_slave_sg(chan, sg, ret,
-			DMA_MEM_TO_DEV, DMA_CTRL_ACK);
-
-	if (desc) {
-		reinit_completion(&host->dma_dataend);
-		desc->callback = tmio_mmc_dma_callback;
-		desc->callback_param = host;
-
-		cookie = dmaengine_submit(desc);
-		if (cookie < 0) {
-			desc = NULL;
-			ret = cookie;
-		}
-	}
-pio:
-	if (!desc) {
-		/* DMA failed, fall back to PIO */
-		tmio_mmc_enable_dma(host, false);
-		if (ret >= 0)
-			ret = -EIO;
-		host->chan_tx = NULL;
-		dma_release_channel(chan);
-		/* Free the Rx channel too */
-		chan = host->chan_rx;
-		if (chan) {
-			host->chan_rx = NULL;
-			dma_release_channel(chan);
-		}
-		dev_warn(&host->pdev->dev,
-			 "DMA failed: %d, falling back to PIO\n", ret);
-	}
-}
-
-static void tmio_mmc_start_dma(struct tmio_mmc_host *host,
-			       struct mmc_data *data)
-{
-	if (data->flags & MMC_DATA_READ) {
-		if (host->chan_rx)
-			tmio_mmc_start_dma_rx(host);
-	} else {
-		if (host->chan_tx)
-			tmio_mmc_start_dma_tx(host);
-	}
-}
-
-static void tmio_mmc_issue_tasklet_fn(unsigned long priv)
-{
-	struct tmio_mmc_host *host = (struct tmio_mmc_host *)priv;
-	struct dma_chan *chan = NULL;
-
-	spin_lock_irq(&host->lock);
-
-	if (host && host->data) {
-		if (host->data->flags & MMC_DATA_READ)
-			chan = host->chan_rx;
-		else
-			chan = host->chan_tx;
-	}
-
-	spin_unlock_irq(&host->lock);
-
-	tmio_mmc_enable_mmc_irqs(host, TMIO_STAT_DATAEND);
-
-	if (chan)
-		dma_async_issue_pending(chan);
-}
-
-static void tmio_mmc_request_dma(struct tmio_mmc_host *host,
-				 struct tmio_mmc_data *pdata)
-{
-	/* We can only either use DMA for both Tx and Rx or not use it at all */
-	if (!host->dma || (!host->pdev->dev.of_node &&
-		(!pdata->chan_priv_tx || !pdata->chan_priv_rx)))
-		return;
-
-	if (!host->chan_tx && !host->chan_rx) {
-		struct resource *res = platform_get_resource(host->pdev,
-							     IORESOURCE_MEM, 0);
-		struct dma_slave_config cfg = {};
-		dma_cap_mask_t mask;
-		int ret;
-
-		if (!res)
-			return;
-
-		dma_cap_zero(mask);
-		dma_cap_set(DMA_SLAVE, mask);
-
-		host->chan_tx = dma_request_slave_channel_compat(mask,
-					host->dma->filter, pdata->chan_priv_tx,
-					&host->pdev->dev, "tx");
-		dev_dbg(&host->pdev->dev, "%s: TX: got channel %p\n", __func__,
-			host->chan_tx);
-
-		if (!host->chan_tx)
-			return;
-
-		cfg.direction = DMA_MEM_TO_DEV;
-		cfg.dst_addr = res->start + (CTL_SD_DATA_PORT << host->bus_shift);
-		cfg.dst_addr_width = host->dma->dma_buswidth;
-		if (!cfg.dst_addr_width)
-			cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
-		cfg.src_addr = 0;
-		ret = dmaengine_slave_config(host->chan_tx, &cfg);
-		if (ret < 0)
-			goto ecfgtx;
-
-		host->chan_rx = dma_request_slave_channel_compat(mask,
-					host->dma->filter, pdata->chan_priv_rx,
-					&host->pdev->dev, "rx");
-		dev_dbg(&host->pdev->dev, "%s: RX: got channel %p\n", __func__,
-			host->chan_rx);
-
-		if (!host->chan_rx)
-			goto ereqrx;
-
-		cfg.direction = DMA_DEV_TO_MEM;
-		cfg.src_addr = cfg.dst_addr + host->pdata->dma_rx_offset;
-		cfg.src_addr_width = host->dma->dma_buswidth;
-		if (!cfg.src_addr_width)
-			cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
-		cfg.dst_addr = 0;
-		ret = dmaengine_slave_config(host->chan_rx, &cfg);
-		if (ret < 0)
-			goto ecfgrx;
-
-		host->bounce_buf = (u8 *)__get_free_page(GFP_KERNEL | GFP_DMA);
-		if (!host->bounce_buf)
-			goto ebouncebuf;
-
-		init_completion(&host->dma_dataend);
-		tasklet_init(&host->dma_issue, tmio_mmc_issue_tasklet_fn, (unsigned long)host);
-	}
-
-	tmio_mmc_enable_dma(host, true);
-
-	return;
-
-ebouncebuf:
-ecfgrx:
-	dma_release_channel(host->chan_rx);
-	host->chan_rx = NULL;
-ereqrx:
-ecfgtx:
-	dma_release_channel(host->chan_tx);
-	host->chan_tx = NULL;
-}
-
-static void tmio_mmc_release_dma(struct tmio_mmc_host *host)
-{
-	if (host->chan_tx) {
-		struct dma_chan *chan = host->chan_tx;
-		host->chan_tx = NULL;
-		dma_release_channel(chan);
-	}
-	if (host->chan_rx) {
-		struct dma_chan *chan = host->chan_rx;
-		host->chan_rx = NULL;
-		dma_release_channel(chan);
-	}
-	if (host->bounce_buf) {
-		free_pages((unsigned long)host->bounce_buf, 0);
-		host->bounce_buf = NULL;
-	}
-}
-
-static const struct tmio_mmc_dma_ops tmio_mmc_dma_ops = {
-	.start = tmio_mmc_start_dma,
-	.enable = tmio_mmc_enable_dma,
-	.request = tmio_mmc_request_dma,
-	.release = tmio_mmc_release_dma,
-	.abort = tmio_mmc_abort_dma,
-};
-
-const struct tmio_mmc_dma_ops *tmio_mmc_get_dma_ops(void)
-{
-	return &tmio_mmc_dma_ops;
-}