linux-kernel - [ 28/75] ARM: kirkwood: fix to retain gbe MAC addresses for DT kernels

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20130318210512.273792876@linuxfoundation.org>
Date:	Mon, 18 Mar 2013 14:06:51 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Simon Baatz <gmbnomis@...il.com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Jason Cooper <jason@...edaemon.net>
Subject: [ 28/75] ARM: kirkwood: fix to retain gbe MAC addresses for DT kernels

3.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>

commit 7bf5b408b419fc849578e6e9fbd221bf43638eb6 upstream.

The ethernet controller used on kirkwood looses its MAC address
register contents when the corresponding clock is gated. As soon as
mv643xx_eth is built as module, the clock gets gated and when loading
the module, the MAC address is gone.

Proper DT support for the mv643xx_eth driver is expected soon, so we add
a workaround to always enable ge0/ge1 clocks on kirkwood. This workaround
is also already used on non-DT kirkwood kernels.

Reported-by: Simon Baatz <gmbnomis@...il.com>
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Tested-by: Simon Baatz <gmbnomis@...il.com>
Signed-off-by: Jason Cooper <jason@...edaemon.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/mach-kirkwood/board-dt.c |   24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)

--- a/arch/arm/mach-kirkwood/board-dt.c
+++ b/arch/arm/mach-kirkwood/board-dt.c
@@ -41,16 +41,12 @@ static void __init kirkwood_legacy_clk_i
 
 	struct device_node *np = of_find_compatible_node(
 		NULL, NULL, "marvell,kirkwood-gating-clock");
-
 	struct of_phandle_args clkspec;
+	struct clk *clk;
 
 	clkspec.np = np;
 	clkspec.args_count = 1;
 
-	clkspec.args[0] = CGC_BIT_GE0;
-	orion_clkdev_add(NULL, "mv643xx_eth_port.0",
-			 of_clk_get_from_provider(&clkspec));
-
 	clkspec.args[0] = CGC_BIT_PEX0;
 	orion_clkdev_add("0", "pcie",
 			 of_clk_get_from_provider(&clkspec));
@@ -63,14 +59,24 @@ static void __init kirkwood_legacy_clk_i
 	orion_clkdev_add("1", "pcie",
 			 of_clk_get_from_provider(&clkspec));
 
-	clkspec.args[0] = CGC_BIT_GE1;
-	orion_clkdev_add(NULL, "mv643xx_eth_port.1",
-			 of_clk_get_from_provider(&clkspec));
-
 	clkspec.args[0] = CGC_BIT_SDIO;
 	orion_clkdev_add(NULL, "mvsdio",
 			 of_clk_get_from_provider(&clkspec));
 
+	/*
+	 * The ethernet interfaces forget the MAC address assigned by
+	 * u-boot if the clocks are turned off. Until proper DT support
+	 * is available we always enable them for now.
+	 */
+	clkspec.args[0] = CGC_BIT_GE0;
+	clk = of_clk_get_from_provider(&clkspec);
+	orion_clkdev_add(NULL, "mv643xx_eth_port.0", clk);
+	clk_prepare_enable(clk);
+
+	clkspec.args[0] = CGC_BIT_GE1;
+	clk = of_clk_get_from_provider(&clkspec);
+	orion_clkdev_add(NULL, "mv643xx_eth_port.1", clk);
+	clk_prepare_enable(clk);
 }
 
 static void __init kirkwood_of_clk_init(void)


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/