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106 lines
3.1 KiB
106 lines
3.1 KiB
From 085ced2b9e159dbeae029e338958b8c8ae9073b9 Mon Sep 17 00:00:00 2001
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From: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
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Date: Mon, 12 Aug 2013 14:14:56 -0300
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Subject: [PATCH 123/203] mtd: nand: pxa3xx: Make dma code dependent on dma
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capable platforms
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This patch adds a macro ARCH_HAS_DMA to compile-out arch specific
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dma code, namely pxa_request_dma() and pxa_free_dma(). These symbols
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are available only in pxa, which makes impossible to build the driver in
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other platforms than ARCH_PXA.
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In order to handle non-dma capable platforms, we implement a fallbacks that
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allocate buffers as if 'use_dma=false', putting the dma related code
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under the ARCH_HAS_DMA conditional.
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Please note that the correct way to handle this is to migrate the
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dma code to use of the mmp_pdma dmaengine driver. However, currently
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this is not possible because the two dmaengine drivers can't work together.
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Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
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Tested-by: Daniel Mack <zonque@gmail.com>
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Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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---
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drivers/mtd/nand/pxa3xx_nand.c | 34 ++++++++++++++++++++++++++++++++++
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1 file changed, 34 insertions(+)
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--- a/drivers/mtd/nand/pxa3xx_nand.c
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+++ b/drivers/mtd/nand/pxa3xx_nand.c
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@@ -25,7 +25,14 @@
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#include <linux/of.h>
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#include <linux/of_device.h>
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+#if defined(CONFIG_ARCH_PXA) || defined(CONFIG_ARCH_MMP)
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+#define ARCH_HAS_DMA
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+#endif
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+
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+#ifdef ARCH_HAS_DMA
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#include <mach/dma.h>
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+#endif
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+
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#include <linux/platform_data/mtd-nand-pxa3xx.h>
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#define CHIP_DELAY_TIMEOUT (2 * HZ/10)
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@@ -381,6 +388,7 @@ static void handle_data_pio(struct pxa3x
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}
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}
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+#ifdef ARCH_HAS_DMA
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static void start_data_dma(struct pxa3xx_nand_info *info)
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{
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struct pxa_dma_desc *desc = info->data_desc;
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@@ -427,6 +435,10 @@ static void pxa3xx_nand_data_dma_irq(int
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enable_int(info, NDCR_INT_MASK);
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nand_writel(info, NDSR, NDSR_WRDREQ | NDSR_RDDREQ);
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}
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+#else
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+static void start_data_dma(struct pxa3xx_nand_info *info)
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+{}
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+#endif
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static irqreturn_t pxa3xx_nand_irq(int irq, void *devid)
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{
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@@ -905,6 +917,7 @@ static int pxa3xx_nand_detect_config(str
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*/
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#define MAX_BUFF_SIZE PAGE_SIZE
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+#ifdef ARCH_HAS_DMA
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static int pxa3xx_nand_init_buff(struct pxa3xx_nand_info *info)
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{
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struct platform_device *pdev = info->pdev;
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@@ -950,6 +963,20 @@ static void pxa3xx_nand_free_buff(struct
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kfree(info->data_buff);
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}
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}
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+#else
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+static int pxa3xx_nand_init_buff(struct pxa3xx_nand_info *info)
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+{
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+ info->data_buff = kmalloc(MAX_BUFF_SIZE, GFP_KERNEL);
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+ if (info->data_buff == NULL)
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+ return -ENOMEM;
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+ return 0;
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+}
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+
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+static void pxa3xx_nand_free_buff(struct pxa3xx_nand_info *info)
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+{
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+ kfree(info->data_buff);
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+}
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+#endif
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static int pxa3xx_nand_sensing(struct pxa3xx_nand_info *info)
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{
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@@ -1265,6 +1292,13 @@ static int pxa3xx_nand_probe(struct plat
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struct pxa3xx_nand_info *info;
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int ret, cs, probe_success;
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+#ifndef ARCH_HAS_DMA
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+ if (use_dma) {
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+ use_dma = 0;
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+ dev_warn(&pdev->dev,
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+ "This platform can't do DMA on this device\n");
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+ }
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+#endif
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ret = pxa3xx_nand_probe_dt(pdev);
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if (ret)
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return ret;
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