mtd: lpc32xx_slc: Make driver independent of AMBA DMA engine driver

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Gitweb:     http://git.infradead.org/?p=mtd-2.6.git;a=commit;h=de20c22d2bf41f970a6300a89dd550f12121c126
Commit:     de20c22d2bf41f970a6300a89dd550f12121c126
Parent:     af69dcd3862ed174cf67637f4142c9c895862436
Author:     Roland Stigge <stigge at antcom.de>
AuthorDate: Thu Aug 16 15:15:34 2012 +0200
Committer:  David Woodhouse <David.Woodhouse at intel.com>
CommitDate: Sat Sep 29 14:52:45 2012 +0100

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

diff --git a/drivers/mtd/nand/lpc32xx_slc.c b/drivers/mtd/nand/lpc32xx_slc.c
index c8c1d06..1840350 100644
--- a/drivers/mtd/nand/lpc32xx_slc.c
+++ b/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;
@@ -719,9 +720,15 @@ static int lpc32xx_nand_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-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;
@@ -819,6 +826,8 @@ static int __devinit lpc32xx_nand_probe(struct platform_device *pdev)
 	}
 	lpc32xx_wp_disable(host);
 
+	host->pdata = pdev->dev.platform_data;
+
 	mtd = &host->mtd;
 	chip = &host->nand_chip;
 	chip->priv = host;
diff --git a/include/linux/mtd/lpc32xx_slc.h b/include/linux/mtd/lpc32xx_slc.h
new file mode 100644
index 0000000..1169548
--- /dev/null
+++ b/include/linux/mtd/lpc32xx_slc.h
@@ -0,0 +1,20 @@
+/*
+ * Platform data for LPC32xx SoC SLC 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_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 */