linux-kernel - [PATCH] ARM: ls1021a: add platform notifier for dma-coherent requirement

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Message-ID: <1438941719-38350-1-git-send-email-b18965@freescale.com>
Date:	Fri, 7 Aug 2015 18:01:59 +0800
From:	Alison Wang <b18965@...escale.com>
To:	<shawnguo@...nel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
CC:	<jason.jin@...escale.com>
Subject: [PATCH] ARM: ls1021a: add platform notifier for dma-coherent requirement

This patch adds platform notifier for dma-coherent requirement.
Structure arm_coherent_dma_ops is used instead of arm_dma_ops.

Signed-off-by: Alison Wang <alison.wang@...escale.com>
---
 arch/arm/mach-imx/mach-ls1021a.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/arch/arm/mach-imx/mach-ls1021a.c b/arch/arm/mach-imx/mach-ls1021a.c
index b89c858..6bfc71b 100644
--- a/arch/arm/mach-imx/mach-ls1021a.c
+++ b/arch/arm/mach-imx/mach-ls1021a.c
@@ -7,10 +7,39 @@
  * (at your option) any later version.
  */
 
+#include <linux/dma-mapping.h>
+#include <linux/of_platform.h>
 #include <asm/mach/arch.h>
 
 #include "common.h"
 
+static int ls1021a_platform_notifier(struct notifier_block *nb,
+				  unsigned long event, void *__dev)
+{
+	struct device *dev = __dev;
+
+	if (event != BUS_NOTIFY_ADD_DEVICE)
+		return NOTIFY_DONE;
+
+	if (of_device_is_compatible(dev->of_node, "fsl,etsec2"))
+		set_dma_ops(dev, &arm_coherent_dma_ops);
+	else if (of_property_read_bool(dev->of_node, "dma-coherent"))
+		set_dma_ops(dev, &arm_coherent_dma_ops);
+
+	return NOTIFY_OK;
+}
+
+static struct notifier_block ls1021a_platform_nb = {
+	.notifier_call = ls1021a_platform_notifier,
+};
+
+static void __init ls1021a_init_machine(void)
+{
+	bus_register_notifier(&platform_bus_type, &ls1021a_platform_nb);
+
+	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+}
+
 static const char * const ls1021a_dt_compat[] __initconst = {
 	"fsl,ls1021a",
 	NULL,
@@ -18,5 +47,6 @@ static const char * const ls1021a_dt_compat[] __initconst = {
 
 DT_MACHINE_START(LS1021A, "Freescale LS1021A")
 	.smp		= smp_ops(ls1021a_smp_ops),
+	.init_machine   = ls1021a_init_machine,
 	.dt_compat	= ls1021a_dt_compat,
 MACHINE_END
-- 
2.1.0.27.g96db324

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