linux-kernel - [PATCH 10/14] staging: fsl-mc: add dprc version check

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Date:	Mon, 11 Apr 2016 11:56:05 -0500
From:	Stuart Yoder <stuart.yoder@....com>
To:	<gregkh@...uxfoundation.org>, <german.rivera@....com>
CC:	<devel@...verdev.osuosl.org>, <linux-kernel@...r.kernel.org>,
	<agraf@...e.de>, <arnd@...db.de>, <leoyang.li@....com>,
	Itai Katz <itai.katz@....com>,
	Stuart Yoder <stuart.yoder@....com>
Subject: [PATCH 10/14] staging: fsl-mc: add dprc version check

From: Itai Katz <itai.katz@....com>

The dprc driver supports dprc version 5.0 and above.
This patch adds the code to check the version.

Signed-off-by: Itai Katz <itai.katz@....com>
(Stuart: resolved merge conflicts, split dpseci quirk into separate patch)
Signed-off-by: Stuart Yoder <stuart.yoder@....com>
---
 drivers/staging/fsl-mc/bus/dprc-cmd.h       |    6 +++---
 drivers/staging/fsl-mc/bus/dprc-driver.c    |   19 +++++++++++++++++++
 drivers/staging/fsl-mc/bus/mc-bus.c         |    1 +
 drivers/staging/fsl-mc/include/mc-private.h |    2 ++
 4 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/fsl-mc/bus/dprc-cmd.h b/drivers/staging/fsl-mc/bus/dprc-cmd.h
index d0198f5..9b854fa 100644
--- a/drivers/staging/fsl-mc/bus/dprc-cmd.h
+++ b/drivers/staging/fsl-mc/bus/dprc-cmd.h
@@ -40,9 +40,9 @@
 #ifndef _FSL_DPRC_CMD_H
 #define _FSL_DPRC_CMD_H
 
-/* DPRC Version */
-#define DPRC_VER_MAJOR				5
-#define DPRC_VER_MINOR				1
+/* Minimal supported DPRC Version */
+#define DPRC_MIN_VER_MAJOR			5
+#define DPRC_MIN_VER_MINOR			0
 
 /* Command IDs */
 #define DPRC_CMDID_CLOSE			0x800
diff --git a/drivers/staging/fsl-mc/bus/dprc-driver.c b/drivers/staging/fsl-mc/bus/dprc-driver.c
index 2d88c10..53c6e98 100644
--- a/drivers/staging/fsl-mc/bus/dprc-driver.c
+++ b/drivers/staging/fsl-mc/bus/dprc-driver.c
@@ -693,6 +693,25 @@ static int dprc_probe(struct fsl_mc_device *mc_dev)
 		goto error_cleanup_msi_domain;
 	}
 
+	error = dprc_get_attributes(mc_dev->mc_io, 0, mc_dev->mc_handle,
+				    &mc_bus->dprc_attr);
+	if (error < 0) {
+		dev_err(&mc_dev->dev, "dprc_get_attributes() failed: %d\n",
+			error);
+		goto error_cleanup_open;
+	}
+
+	if (mc_bus->dprc_attr.version.major < DPRC_MIN_VER_MAJOR ||
+	   (mc_bus->dprc_attr.version.major == DPRC_MIN_VER_MAJOR &&
+	    mc_bus->dprc_attr.version.minor < DPRC_MIN_VER_MINOR)) {
+		dev_err(&mc_dev->dev,
+			"ERROR: DPRC version %d.%d not supported\n",
+			mc_bus->dprc_attr.version.major,
+			mc_bus->dprc_attr.version.minor);
+		error = -ENOTSUPP;
+		goto error_cleanup_open;
+	}
+
 	mutex_init(&mc_bus->scan_mutex);
 
 	/*
diff --git a/drivers/staging/fsl-mc/bus/mc-bus.c b/drivers/staging/fsl-mc/bus/mc-bus.c
index b4c3c5e..4053643 100644
--- a/drivers/staging/fsl-mc/bus/mc-bus.c
+++ b/drivers/staging/fsl-mc/bus/mc-bus.c
@@ -745,6 +745,7 @@ static int fsl_mc_bus_probe(struct platform_device *pdev)
 		goto error_cleanup_mc_io;
 	}
 
+	memset(&obj_desc, 0, sizeof(struct dprc_obj_desc));
 	error = get_dprc_version(mc_io, container_id,
 				 &obj_desc.ver_major, &obj_desc.ver_minor);
 	if (error < 0)
diff --git a/drivers/staging/fsl-mc/include/mc-private.h b/drivers/staging/fsl-mc/include/mc-private.h
index ee5f1d2..cab1ae9 100644
--- a/drivers/staging/fsl-mc/include/mc-private.h
+++ b/drivers/staging/fsl-mc/include/mc-private.h
@@ -94,12 +94,14 @@ struct fsl_mc_resource_pool {
  * from the physical DPRC.
  * @irq_resources: Pointer to array of IRQ objects for the IRQ pool
  * @scan_mutex: Serializes bus scanning
+ * @dprc_attr: DPRC attributes
  */
 struct fsl_mc_bus {
 	struct fsl_mc_device mc_dev;
 	struct fsl_mc_resource_pool resource_pools[FSL_MC_NUM_POOL_TYPES];
 	struct fsl_mc_device_irq *irq_resources;
 	struct mutex scan_mutex;    /* serializes bus scanning */
+	struct dprc_attributes dprc_attr;
 };
 
 #define to_fsl_mc_bus(_mc_dev) \
-- 
1.7.9.5