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authorSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>2013-10-07 22:25:11 +0200
committerJason Cooper <jason@lakedaemon.net>2013-10-08 16:59:21 +0000
commitebd7d3ab50f960e780e7c825a42b5cb6e21ee376 (patch)
treebc397ae5e8ba5095fef1b2ae5a8c9b8fd7249a75 /arch/arm/mach-kirkwood
parent3839c08d3ae44cf39b26eecefdae07f7b2443e7e (diff)
downloadop-kernel-dev-ebd7d3ab50f960e780e7c825a42b5cb6e21ee376.zip
op-kernel-dev-ebd7d3ab50f960e780e7c825a42b5cb6e21ee376.tar.gz
ARM: kirkwood: retain MAC address for DT ethernet
Ethernet IP on Kirkwood SoCs loose their MAC address register content if clock gated. To allow modular ethernet driver setups and gated clocks also on non-DT capable bootloaders, we fixup port device nodes with no valid MAC address property. This patch copies MAC address register contents set up by bootloaders early, notably before ethernet clocks are gated. While at it, also reorder call sequence in _dt_init. Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Reviewed-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> Reviewed-by: Mike Turquette <mturquette@linaro.org> Tested-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Diffstat (limited to 'arch/arm/mach-kirkwood')
-rw-r--r--arch/arm/mach-kirkwood/board-dt.c85
1 files changed, 83 insertions, 2 deletions
diff --git a/arch/arm/mach-kirkwood/board-dt.c b/arch/arm/mach-kirkwood/board-dt.c
index d8b666c..27c1877 100644
--- a/arch/arm/mach-kirkwood/board-dt.c
+++ b/arch/arm/mach-kirkwood/board-dt.c
@@ -13,6 +13,8 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_net.h>
#include <linux/of_platform.h>
#include <linux/clk-provider.h>
#include <linux/clocksource.h>
@@ -58,6 +60,85 @@ static void __init kirkwood_legacy_clk_init(void)
clk_prepare_enable(clk);
}
+#define MV643XX_ETH_MAC_ADDR_LOW 0x0414
+#define MV643XX_ETH_MAC_ADDR_HIGH 0x0418
+
+static void __init kirkwood_dt_eth_fixup(void)
+{
+ struct device_node *np;
+
+ /*
+ * The ethernet interfaces forget the MAC address assigned by u-boot
+ * if the clocks are turned off. Usually, u-boot on kirkwood boards
+ * has no DT support to properly set local-mac-address property.
+ * As a workaround, we get the MAC address from mv643xx_eth registers
+ * and update the port device node if no valid MAC address is set.
+ */
+ for_each_compatible_node(np, NULL, "marvell,kirkwood-eth-port") {
+ struct device_node *pnp = of_get_parent(np);
+ struct clk *clk;
+ struct property *pmac;
+ void __iomem *io;
+ u8 *macaddr;
+ u32 reg;
+
+ if (!pnp)
+ continue;
+
+ /* skip disabled nodes or nodes with valid MAC address*/
+ if (!of_device_is_available(pnp) || of_get_mac_address(np))
+ goto eth_fixup_skip;
+
+ clk = of_clk_get(pnp, 0);
+ if (IS_ERR(clk))
+ goto eth_fixup_skip;
+
+ io = of_iomap(pnp, 0);
+ if (!io)
+ goto eth_fixup_no_map;
+
+ /* ensure port clock is not gated to not hang CPU */
+ clk_prepare_enable(clk);
+
+ /* store MAC address register contents in local-mac-address */
+ pr_err(FW_INFO "%s: local-mac-address is not set\n",
+ np->full_name);
+
+ pmac = kzalloc(sizeof(*pmac) + 6, GFP_KERNEL);
+ if (!pmac)
+ goto eth_fixup_no_mem;
+
+ pmac->value = pmac + 1;
+ pmac->length = 6;
+ pmac->name = kstrdup("local-mac-address", GFP_KERNEL);
+ if (!pmac->name) {
+ kfree(pmac);
+ goto eth_fixup_no_mem;
+ }
+
+ macaddr = pmac->value;
+ reg = readl(io + MV643XX_ETH_MAC_ADDR_HIGH);
+ macaddr[0] = (reg >> 24) & 0xff;
+ macaddr[1] = (reg >> 16) & 0xff;
+ macaddr[2] = (reg >> 8) & 0xff;
+ macaddr[3] = reg & 0xff;
+
+ reg = readl(io + MV643XX_ETH_MAC_ADDR_LOW);
+ macaddr[4] = (reg >> 8) & 0xff;
+ macaddr[5] = reg & 0xff;
+
+ of_update_property(np, pmac);
+
+eth_fixup_no_mem:
+ iounmap(io);
+ clk_disable_unprepare(clk);
+eth_fixup_no_map:
+ clk_put(clk);
+eth_fixup_skip:
+ of_node_put(pnp);
+ }
+}
+
static void __init kirkwood_dt_time_init(void)
{
of_clk_init(NULL);
@@ -82,12 +163,12 @@ static void __init kirkwood_dt_init(void)
kirkwood_l2_init();
kirkwood_cpufreq_init();
-
+ kirkwood_cpuidle_init();
/* Setup clocks for legacy devices */
kirkwood_legacy_clk_init();
kirkwood_pm_init();
- kirkwood_cpuidle_init();
+ kirkwood_dt_eth_fixup();
#ifdef CONFIG_KEXEC
kexec_reinit = kirkwood_enable_pcie;
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