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@antcom.de>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

2 files changed, 31 insertions, 2 deletions

diff --git a/drivers/mtd/nand/lpc32xx_slc.c b/drivers/mtd/nand/lpc32xx_slc.c
index c8c1d06b35a..18403504520 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 00000000000..1169548a153
--- /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 */