mtd: lpc32xx_mlc: Make driver independent of AMBA DMA engine driver

[Linux-MTD Mailing List]

Gitweb:     http://git.infradead.org/?p=mtd-2.6.git;a=commit;h=9c6f62a7ef230253a7dfc0547c431f07d8a64721
Commit:     9c6f62a7ef230253a7dfc0547c431f07d8a64721
Parent:     de20c22d2bf41f970a6300a89dd550f12121c126
Author:     Roland Stigge <stigge at antcom.de>
AuthorDate: Thu Aug 16 15:15:35 2012 +0200
Committer:  David Woodhouse <David.Woodhouse at intel.com>
CommitDate: Sat Sep 29 14:53:08 2012 +0100

    mtd: lpc32xx_mlc: Make driver independent of AMBA DMA engine driver
    
    This patch makes the MLC 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 at antcom.de>
    Signed-off-by: Artem Bityutskiy <artem.bityutskiy at linux.intel.com>
    Signed-off-by: David Woodhouse <David.Woodhouse at intel.com>
---
 drivers/mtd/nand/lpc32xx_mlc.c  |   13 +++++++++++--
 include/linux/mtd/lpc32xx_mlc.h |   20 ++++++++++++++++++++
 2 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/nand/lpc32xx_mlc.c b/drivers/mtd/nand/lpc32xx_mlc.c
index 1cf3593..5da3179 100644
--- a/drivers/mtd/nand/lpc32xx_mlc.c
+++ b/drivers/mtd/nand/lpc32xx_mlc.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_mlc.h>
 #include <linux/io.h>
 #include <linux/mm.h>
 #include <linux/dma-mapping.h>
@@ -171,6 +171,7 @@ static struct nand_bbt_descr lpc32xx_nand_bbt_mirror = {
 
 struct lpc32xx_nand_host {
 	struct nand_chip	nand_chip;
+	struct lpc32xx_mlc_platform_data *pdata;
 	struct clk		*clk;
 	struct mtd_info		mtd;
 	void __iomem		*io_base;
@@ -581,9 +582,15 @@ static int lpc32xx_dma_setup(struct lpc32xx_nand_host *host)
 	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-mlc");
+	host->dma_chan = dma_request_channel(mask, host->pdata->dma_filter,
+					     "nand-mlc");
 	if (!host->dma_chan) {
 		dev_err(mtd->dev.parent, "Failed to request DMA channel\n");
 		return -EBUSY;
@@ -703,6 +710,8 @@ static int __devinit lpc32xx_nand_probe(struct platform_device *pdev)
 	}
 	lpc32xx_wp_disable(host);
 
+	host->pdata = pdev->dev.platform_data;
+
 	nand_chip->priv = host;		/* link the private data structures */
 	mtd->priv = nand_chip;
 	mtd->owner = THIS_MODULE;
diff --git a/include/linux/mtd/lpc32xx_mlc.h b/include/linux/mtd/lpc32xx_mlc.h
new file mode 100644
index 0000000..d91b1e3
--- /dev/null
+++ b/include/linux/mtd/lpc32xx_mlc.h
@@ -0,0 +1,20 @@
+/*
+ * Platform data for LPC32xx SoC MLC NAND controller
+ *
+ * Copyright © 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_MLC_H
+#define __LINUX_MTD_LPC32XX_MLC_H
+
+#include <linux/dmaengine.h>
+
+struct lpc32xx_mlc_platform_data {
+	bool (*dma_filter)(struct dma_chan *chan, void *filter_param);
+};
+
+#endif  /* __LINUX_MTD_LPC32XX_MLC_H */