linux-kernel - [PATCH] mtd: lpc32xx_slc: Make driver independent of AMBA DMA engine driver

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Message-Id: <1345122935-22115-2-git-send-email-stigge@antcom.de>
Date:	Thu, 16 Aug 2012 15:15:34 +0200
From:	Roland Stigge <stigge@...com.de>
To:	linux@....linux.org.uk, artem.bityutskiy@...ux.intel.com,
	linux-arm-kernel@...ts.infradead.org, arnd@...db.de,
	linux-kernel@...r.kernel.org, kevin.wells@....com,
	srinivas.bakki@....com, aletes.xgr@...il.com, dwmw2@...radead.org,
	linux-mtd@...ts.infradead.org
Cc:	Roland Stigge <stigge@...com.de>
Subject: [PATCH] mtd: lpc32xx_slc: Make driver independent of AMBA DMA engine driver

This patch makes the SLC NAND driver independent of the single AMBA DMA engine
driver by using the platform data provided dma_filter callback.

Signed-off-by: Roland Stigge <stigge@...com.de>

---
 drivers/mtd/nand/lpc32xx_slc.c  |   13 +++++++++++--
 include/linux/mtd/lpc32xx_slc.h |   20 ++++++++++++++++++++
 2 files changed, 31 insertions(+), 2 deletions(-)

--- linux-2.6.orig/drivers/mtd/nand/lpc32xx_slc.c
+++ linux-2.6/drivers/mtd/nand/lpc32xx_slc.c
@@ -37,7 +37,7 @@
 #include <linux/of.h>
 #include <linux/of_mtd.h>
 #include <linux/of_gpio.h>
-#include <linux/amba/pl08x.h>
+#include <linux/mtd/lpc32xx_slc.h>
 
 #define LPC32XX_MODNAME		"lpc32xx-nand"
 
@@ -199,6 +199,7 @@ struct lpc32xx_nand_cfg_slc {
 
 struct lpc32xx_nand_host {
 	struct nand_chip	nand_chip;
+	struct lpc32xx_slc_platform_data *pdata;
 	struct clk		*clk;
 	struct mtd_info		mtd;
 	void __iomem		*io_base;
@@ -714,9 +715,15 @@ static int lpc32xx_nand_dma_setup(struct
 	struct mtd_info *mtd = &host->mtd;
 	dma_cap_mask_t mask;
 
+	if (!host->pdata || !host->pdata->dma_filter) {
+		dev_err(mtd->dev.parent, "no DMA platform data\n");
+		return -ENOENT;
+	}
+
 	dma_cap_zero(mask);
 	dma_cap_set(DMA_SLAVE, mask);
-	host->dma_chan = dma_request_channel(mask, pl08x_filter_id, "nand-slc");
+	host->dma_chan = dma_request_channel(mask, host->pdata->dma_filter,
+					     "nand-slc");
 	if (!host->dma_chan) {
 		dev_err(mtd->dev.parent, "Failed to request DMA channel\n");
 		return -EBUSY;
@@ -814,6 +821,8 @@ static int __devinit lpc32xx_nand_probe(
 	}
 	lpc32xx_wp_disable(host);
 
+	host->pdata = pdev->dev.platform_data;
+
 	mtd = &host->mtd;
 	chip = &host->nand_chip;
 	chip->priv = host;
--- /dev/null
+++ linux-2.6/include/linux/mtd/lpc32xx_slc.h
@@ -0,0 +1,20 @@
+/*
+ * Platform data for LPC32xx SoC SLC NAND controller
+ *
+ * Copyright (C) 2012 Roland Stigge
+ *
+ * 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.
+ */
+
+#ifndef __LINUX_MTD_LPC32XX_SLC_H
+#define __LINUX_MTD_LPC32XX_SLC_H
+
+#include <linux/dmaengine.h>
+
+struct lpc32xx_slc_platform_data {
+	bool (*dma_filter)(struct dma_chan *chan, void *filter_param);
+};
+
+#endif  /* __LINUX_MTD_LPC32XX_SLC_H */
--
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