linux-kernel - [PATCH 5/7] mmc: at91_mci: update bytes

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Date:	Fri, 30 May 2008 14:18:57 +0200
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	Pierre Ossman <drzeus@...eus.cx>
CC:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Hans J Koch <hjk@...utronix.de>,
	Ville Syrjala <syrjala@....fi>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	ARM Linux Mailing List 
	<linux-arm-kernel@...ts.arm.linux.org.uk>,
	Eric BENARD <ebenard@...e.fr>,
	Andrew Victor <linux@...im.org.za>
Subject: [PATCH 5/7] mmc: at91_mci: update bytes_xfered value once xfer done

Modify bytes_xfered value after a write.

That will report, as accurately as possible, the amount of 
sectors that are effectively written.

This update introduces the check of the busy signal given by
the card.

Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>
---
 drivers/mmc/host/at91_mci.c |   40 ++++++++++++++++++++++++++++++++++------
 1 files changed, 34 insertions(+), 6 deletions(-)

diff --git a/drivers/mmc/host/at91_mci.c b/drivers/mmc/host/at91_mci.c
index df975e0..b2138f9 100644
--- a/drivers/mmc/host/at91_mci.c
+++ b/drivers/mmc/host/at91_mci.c
@@ -340,8 +340,6 @@ static void at91_mci_post_dma_read(struct at91mci_host *host)
 
 		dma_unmap_page(NULL, sg->dma_address, sg->length, DMA_FROM_DEVICE);
 
-		data->bytes_xfered += sg->length;
-
 		if (cpu_is_at91rm9200()) {	/* AT91RM9200 errata */
 			unsigned int *buffer;
 			int index;
@@ -357,6 +355,8 @@ static void at91_mci_post_dma_read(struct at91mci_host *host)
 		}
 
 		flush_dcache_page(sg_page(sg));
+
+		data->bytes_xfered += sg->length;
 	}
 
 	/* Is there another transfer to trigger? */
@@ -397,10 +397,32 @@ static void at91_mci_handle_transmitted(struct at91mci_host *host)
 		at91_mci_write(host, AT91_MCI_IER, AT91_MCI_BLKE);
 	} else
 		at91_mci_write(host, AT91_MCI_IER, AT91_MCI_NOTBUSY);
+}
+
+/*
+ * Update bytes tranfered count during a write operation
+ */
+static void at91_mci_update_bytes_xfered(struct at91mci_host *host)
+{
+	struct mmc_data *data;
 
-	data->bytes_xfered = host->total_length;
+	/* always deal with the effective request (and not the current cmd) */
+
+	if (host->request->cmd && host->request->cmd->error != 0)
+		return;
+
+	if (host->request->data) {
+		data = host->request->data;
+		if (data->flags & MMC_DATA_WRITE) {
+			/* card is in IDLE mode now */
+			pr_debug("-> bytes_xfered %d, total_length = %d\n",
+				data->bytes_xfered, host->total_length);
+			data->bytes_xfered = host->total_length;
+		}
+	}
 }
 
+
 /*Handle after command sent ready*/
 static int at91_mci_handle_cmdrdy(struct at91mci_host *host)
 {
@@ -413,8 +435,7 @@ static int at91_mci_handle_cmdrdy(struct at91mci_host *host)
 		} else return 1;
 	} else if (host->cmd->data->flags & MMC_DATA_WRITE) {
 		/*After sendding multi-block-write command, start DMA transfer*/
-		at91_mci_write(host, AT91_MCI_IER, AT91_MCI_TXBUFE);
-		at91_mci_write(host, AT91_MCI_IER, AT91_MCI_BLKE);
+		at91_mci_write(host, AT91_MCI_IER, AT91_MCI_TXBUFE | AT91_MCI_BLKE);
 		at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN);
 	}
 
@@ -817,6 +838,7 @@ static irqreturn_t at91_mci_irq(int irq, void *devid)
 
 		if (int_status & AT91_MCI_NOTBUSY) {
 			pr_debug("Card is ready\n");
+			at91_mci_update_bytes_xfered(host);
 			completed = 1;
 		}
 
@@ -825,7 +847,13 @@ static irqreturn_t at91_mci_irq(int irq, void *devid)
 
 		if (int_status & AT91_MCI_BLKE) {
 			pr_debug("Block transfer has ended\n");
-			completed = 1;
+			if (host->request->data && host->request->data->blocks > 1) {
+				/* multi block write : complete multi write
+				 * command and send stop */
+				completed = 1;
+			} else {
+				at91_mci_write(host, AT91_MCI_IER, AT91_MCI_NOTBUSY);
+			}
 		}
 
 		if (int_status & AT91_MCI_TXRDY)
-- 
1.5.3.7


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