linux-kernel - [PATCH v3 05/12] ARM: edma: Add function to enable interrupt for a PaRAM slot

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Message-ID: <1375719297-12871-6-git-send-email-joelf@ti.com>
Date:	Mon, 5 Aug 2013 11:14:50 -0500
From:	Joel Fernandes <joelf@...com>
To:	Tony Lindgren <tony@...mide.com>, Sekhar Nori <nsekhar@...com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Sricharan R <r.sricharan@...com>,
	Rajendra Nayak <rnayak@...com>,
	Lokesh Vutla <lokeshvutla@...com>,
	Matt Porter <matt@...orter.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Vinod Koul <vinod.koul@...el.com>, Dan Williams <djbw@...com>,
	Mark Brown <broonie@...aro.org>,
	Benoit Cousson <benoit.cousson@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
	Balaji TK <balajitk@...com>,
	Gururaja Hebbar <gururaja.hebbar@...com>,
	Chris Ball <cjb@...top.org>,
	Jason Kridner <jkridner@...gleboard.org>
CC:	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux MMC List <linux-mmc@...r.kernel.org>,
	Joel Fernandes <joelf@...com>
Subject: [PATCH v3 05/12] ARM: edma: Add function to enable interrupt for a PaRAM slot

To prevent common programming errors, add a function to enable
interrupts correctly. Also keeps calling code more readable.

Signed-off-by: Joel Fernandes <joelf@...com>
---
 arch/arm/common/edma.c             |   15 +++++++++++++++
 include/linux/platform_data/edma.h |    1 +
 2 files changed, 16 insertions(+)

diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c
index 6433b6c..aa43c49 100644
--- a/arch/arm/common/edma.c
+++ b/arch/arm/common/edma.c
@@ -1095,6 +1095,21 @@ void edma_set_transfer_params(unsigned slot,
 EXPORT_SYMBOL(edma_set_transfer_params);
 
 /**
+ * edma_enable_interrupt - enable interrupt on parameter RAM slot
+ * @slot: parameter RAM slot which is the link target
+ *
+ * The originating slot should not be part of any active DMA transfer.
+ */
+void edma_enable_interrupt(unsigned slot)
+{
+	pr_debug("Enabling interrupt on slot %d\n", slot);
+
+	edma_parm_modify(EDMA_CTLR(slot), PARM_OPT, EDMA_CHAN_SLOT(slot),
+			 ~TCINTEN, TCINTEN);
+}
+EXPORT_SYMBOL(edma_enable_interrupt);
+
+/**
  * edma_link - link one parameter RAM slot to another
  * @from: parameter RAM slot originating the link
  * @to: parameter RAM slot which is the link target
diff --git a/include/linux/platform_data/edma.h b/include/linux/platform_data/edma.h
index 57300fd..184ff5f 100644
--- a/include/linux/platform_data/edma.h
+++ b/include/linux/platform_data/edma.h
@@ -136,6 +136,7 @@ void edma_set_dest_index(unsigned slot, s16 dest_bidx, s16 dest_cidx);
 void edma_set_transfer_params(unsigned slot, u16 acnt, u16 bcnt, u16 ccnt,
 		u16 bcnt_rld, enum sync_dimension sync_mode);
 void edma_link(unsigned from, unsigned to);
+void edma_enable_interrupt(unsigned slot);
 void edma_unlink(unsigned from);
 
 /* calls that operate on an entire parameter RAM slot */
-- 
1.7.9.5

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