[PATCH 03/03] omap hsmmc: adaptation of sdma descriptor autoloading feature

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See previous post http://patchwork.kernel.org/patch/82909/.
Rebased to 2.6.34-rc1

CC: Adrian Hunter <adrian.hunter@xxxxxxxxx>
CC: Madhusudhan C <madhu.cr@xxxxxx>
CC: Tony Lindgren <tony@xxxxxxxxxxx>
Signed-off-by: Venkatraman S <svenkatr@xxxxxx>
---
 drivers/mmc/host/omap_hsmmc.c |  143 +++++++++++++++++++++++++++++++++++------
 1 files changed, 122 insertions(+), 21 deletions(-)

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index ea2a082..131d889 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -102,6 +102,7 @@
 #define SRD			(1 << 26)
 #define SOFTRESET		(1 << 1)
 #define RESETDONE		(1 << 0)
+#define DMA_ICR_QUIET		0xD00

 /*
  * FIXME: Most likely all the data using these _DEVID defines should come
@@ -118,6 +119,12 @@
 #define OMAP_MMC_MASTER_CLOCK	96000000
 #define DRIVER_NAME		"mmci-omap-hs"

+#define DMA_TYPE_NODMA	0
+#define DMA_TYPE_SDMA	1
+#define DMA_TYPE_SDMA_DLOAD 2
+
+#define DMA_CTRL_BUF_SIZE	(PAGE_SIZE * 3)
+
 /* Timeouts for entering power saving states on inactivity, msec */
 #define OMAP_MMC_DISABLED_TIMEOUT	100
 #define OMAP_MMC_SLEEP_TIMEOUT		1000
@@ -172,7 +179,11 @@ struct omap_hsmmc_host {
 	u32			bytesleft;
 	int			suspended;
 	int			irq;
-	int			use_dma, dma_ch;
+	int			dma_caps;
+	int			dma_in_use;
+	int			dma_ch;
+	void			*dma_ctrl_buf;
+	dma_addr_t		dma_ctrl_buf_phy;
 	int			dma_line_tx, dma_line_rx;
 	int			slot_id;
 	int			got_dbclk;
@@ -768,7 +779,7 @@ omap_hsmmc_start_command(struct omap_hsmmc_host
*host, struct mmc_command *cmd,
 	OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
 	OMAP_HSMMC_WRITE(host->base, ISE, INT_EN_MASK);

-	if (host->use_dma)
+	if (host->dma_in_use)
 		OMAP_HSMMC_WRITE(host->base, IE,
 				 INT_EN_MASK & ~(BRR_ENABLE | BWR_ENABLE));
 	else
@@ -803,7 +814,7 @@ omap_hsmmc_start_command(struct omap_hsmmc_host
*host, struct mmc_command *cmd,
 			cmdreg &= ~(DDIR);
 	}

-	if (host->use_dma)
+	if (host->dma_in_use)
 		cmdreg |= DMA_EN;

 	/*
@@ -850,7 +861,7 @@ omap_hsmmc_xfer_done(struct omap_hsmmc_host *host,
struct mmc_data *data)

 	host->data = NULL;

-	if (host->use_dma && host->dma_ch != -1)
+	if (host->dma_in_use && host->dma_ch != -1)
 		dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_len,
 			omap_hsmmc_get_dma_dir(host, data));

@@ -900,7 +911,7 @@ static void omap_hsmmc_dma_cleanup(struct
omap_hsmmc_host *host, int errno)
 {
 	host->data->error = errno;

-	if (host->use_dma && host->dma_ch != -1) {
+	if (host->dma_in_use && host->dma_ch != -1) {
 		dma_unmap_sg(mmc_dev(host->mmc), host->data->sg, host->dma_len,
 			omap_hsmmc_get_dma_dir(host, host->data));
 		omap_free_dma(host->dma_ch);
@@ -1253,7 +1264,6 @@ static void omap_hsmmc_config_dma_params(struct
omap_hsmmc_host *host,
 			omap_hsmmc_get_dma_sync_dev(host, data),
 			!(data->flags & MMC_DATA_WRITE));

-	omap_start_dma(dma_ch);
 }

 /*
@@ -1268,21 +1278,32 @@ static void omap_hsmmc_dma_cb(int lch, u16
ch_status, void *data)

 	if (host->dma_ch < 0)
 		return;
-
-	host->dma_sg_idx++;
-	if (host->dma_sg_idx < host->dma_len) {
-		/* Fire up the next transfer. */
-		omap_hsmmc_config_dma_params(host, host->data,
+	if (host->dma_in_use == DMA_TYPE_SDMA) {
+		host->dma_sg_idx++;
+		if (host->dma_sg_idx < host->dma_len) {
+			/* Fire up the next transfer. */
+			omap_hsmmc_config_dma_params(host, host->data,
 					   host->data->sg + host->dma_sg_idx);
-		return;
+			omap_start_dma(host->dma_ch);
+			return;
+		}
 	}

 }

+static int omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host)
+{
+	if (host->dma_in_use == DMA_TYPE_SDMA)
+		omap_start_dma(host->dma_ch);
+	else if (host->dma_in_use == DMA_TYPE_SDMA_DLOAD)
+		return omap_start_dma_sglist_transfers(host->dma_ch, -1);
+
+	return 0;
+}
 /*
- * Routine to configure and start DMA for the MMC card
+ * Routine to configure DMA for the MMC card
  */
-static int omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host,
+static int omap_hsmmc_configure_sdma(struct omap_hsmmc_host *host,
 					struct mmc_request *req)
 {
 	int dma_ch = 0, ret = 0, err = 1, i;
@@ -1339,6 +1360,56 @@ static int omap_hsmmc_start_dma_transfer(struct
omap_hsmmc_host *host,
 	return 0;
 }

+static int omap_hsmmc_configure_sdma_sglist(struct omap_hsmmc_host *host,
+		struct mmc_request *req)
+{
+	int i;
+	struct omap_dma_sglist_node *sglist, *snode;
+	struct mmc_data *data = req->data;
+	int blksz;
+	int dmadir = omap_hsmmc_get_dma_dir(host, data);
+	struct omap_dma_sglist_type2a_params *t2p;
+
+	sglist = (struct omap_dma_sglist_node *) host->dma_ctrl_buf;
+	snode = sglist;
+	blksz = host->data->blksz;
+
+	if ((host->dma_len * sizeof(*snode)) > DMA_CTRL_BUF_SIZE) {
+		dev_err(mmc_dev(host->mmc), "not enough sglist memory %d\n",
+			host->dma_len);
+		return -ENOMEM;
+	}
+	for (i = 0; i < host->dma_len; snode++, i++) {
+		snode->desc_type = OMAP_DMA_SGLIST_DESCRIPTOR_TYPE2a;
+		snode->num_of_elem = blksz / 4;
+		t2p = &snode->sg_node.t2a;
+
+		if (dmadir == DMA_FROM_DEVICE) {
+			t2p->src_addr = host->mapbase + OMAP_HSMMC_DATA;
+			t2p->dst_addr = sg_dma_address(data->sg + i);
+		} else {
+			t2p->dst_addr = host->mapbase + OMAP_HSMMC_DATA;
+			t2p->src_addr = sg_dma_address(data->sg + i);
+		}
+		snode->flags =
+			OMAP_DMA_LIST_DST_VALID | OMAP_DMA_LIST_SRC_VALID;
+
+		t2p->cfn_fn = sg_dma_len(data->sg + i) / host->data->blksz;
+		t2p->cicr = DMA_ICR_QUIET;
+
+		t2p->dst_frame_idx_or_pkt_size = 0;
+		t2p->src_frame_idx_or_pkt_size = 0;
+		t2p->dst_elem_idx = 0;
+		t2p->src_elem_idx = 0;
+	}
+	dev_dbg(mmc_dev(host->mmc), "new sglist %x len =%d\n",
+			host->dma_ctrl_buf_phy, i);
+	omap_set_dma_sglist_mode(host->dma_ch, sglist,
+			host->dma_ctrl_buf_phy, i, NULL);
+	omap_dma_set_sglist_fastmode(host->dma_ch, 1);
+	return 0;
+}
+
 static void set_data_timeout(struct omap_hsmmc_host *host,
 			     unsigned int timeout_ns,
 			     unsigned int timeout_clks)
@@ -1400,14 +1471,23 @@ omap_hsmmc_prepare_data(struct omap_hsmmc_host
*host, struct mmc_request *req)
 					| (req->data->blocks << 16));
 	set_data_timeout(host, req->data->timeout_ns, req->data->timeout_clks);

-	if (host->use_dma) {
-		ret = omap_hsmmc_start_dma_transfer(host, req);
-		if (ret != 0) {
-			dev_dbg(mmc_dev(host->mmc), "MMC start dma failure\n");
+	if (host->dma_caps & DMA_TYPE_SDMA) {
+		ret = omap_hsmmc_configure_sdma(host, req);
+		if (ret)
 			return ret;
-		}
+		host->dma_in_use = DMA_TYPE_SDMA;
 	}
-	return 0;
+	if ((host->dma_caps & DMA_TYPE_SDMA_DLOAD) &&
+		host->data->sg_len > 4) {
+		ret = omap_hsmmc_configure_sdma_sglist(host, req);
+		if (ret)
+			return ret;
+		host->dma_in_use = DMA_TYPE_SDMA_DLOAD;
+
+	}
+	ret = omap_hsmmc_start_dma_transfer(host);
+	return ret;
+
 }

 /*
@@ -1999,7 +2079,9 @@ static int __init omap_hsmmc_probe(struct
platform_device *pdev)
 	host->mmc	= mmc;
 	host->pdata	= pdata;
 	host->dev	= &pdev->dev;
-	host->use_dma	= 1;
+	host->dma_caps	= DMA_TYPE_SDMA;
+	host->dma_in_use	= DMA_TYPE_NODMA;
+	host->dma_ctrl_buf = NULL;
 	host->dev->dma_mask = &pdata->dma_mask;
 	host->dma_ch	= -1;
 	host->irq	= irq;
@@ -2081,6 +2163,15 @@ static int __init omap_hsmmc_probe(struct
platform_device *pdev)
 							" clk failed\n");
 	}

+	if (cpu_is_omap44xx() || cpu_is_omap3630()) {
+		host->dma_ctrl_buf = dma_alloc_coherent(NULL,
+					DMA_CTRL_BUF_SIZE,
+					&host->dma_ctrl_buf_phy,
+					0);
+		if (host->dma_ctrl_buf != NULL)
+			host->dma_caps |= DMA_TYPE_SDMA_DLOAD;
+	}
+
 	/* Since we do only SG emulation, we can have as many segs
 	 * as we want. */
 	mmc->max_phys_segs = 1024;
@@ -2207,6 +2298,10 @@ err_reg:
 err_irq_cd_init:
 	free_irq(host->irq, host);
 err_irq:
+	if (host->dma_ctrl_buf)
+		dma_free_coherent(NULL, DMA_CTRL_BUF_SIZE,
+				host->dma_ctrl_buf,
+				host->dma_ctrl_buf_phy);
 	mmc_host_disable(host->mmc);
 	clk_disable(host->iclk);
 	clk_put(host->fclk);
@@ -2234,6 +2329,12 @@ static int omap_hsmmc_remove(struct
platform_device *pdev)
 	if (host) {
 		mmc_host_enable(host->mmc);
 		mmc_remove_host(host->mmc);
+
+		if (host->dma_ctrl_buf != NULL) {
+			dma_free_coherent(NULL, DMA_CTRL_BUF_SIZE,
+				host->dma_ctrl_buf,
+				host->dma_ctrl_buf_phy);
+		}
 		if (host->use_reg)
 			omap_hsmmc_reg_put(host);
 		if (host->pdata->cleanup)
-- 
1.6.3.3
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