ARM: initial DTS support for km_kirkwood

This is a first attempt to support the km_kirkwood reference design with
a device tree. This km_kirkwood design is present in many Keymile
products. It is based on the Marvell Bobcat SOC which integrates a
Kirkwood CPU next to a big L2 Ethernet Switch. The Kirkwood in the SOC
is very similar to the "normal" one, but there are a few differences.

This initial support is minimal: the kernel can boot with network
(ge0), serial port and NAND functional.

Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com>
Cc: Holger Brunck <holger.brunck@keymile.com>
Acked-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

7 files changed, 105 insertions, 0 deletions

diff --git a/arch/arm/boot/dts/kirkwood-km_kirkwood.dts b/arch/arm/boot/dts/kirkwood-km_kirkwood.dts
new file mode 100644
index 000000000000..75bdb93fed26
--- /dev/null
+++ b/arch/arm/boot/dts/kirkwood-km_kirkwood.dts
@@ -0,0 +1,29 @@
+/dts-v1/;
+
+/include/ "kirkwood.dtsi"
+
+/ {
+        model = "Keymile Kirkwood Reference Design";
+        compatible = "keymile,km_kirkwood", "marvell,kirkwood-98DX4122", "marvell,kirkwood";
+
+        memory {
+                device_type = "memory";
+                reg = <0x00000000 0x08000000>;
+        };
+
+        chosen {
+                bootargs = "console=ttyS0,115200n8 earlyprintk";
+        };
+
+        ocp@f1000000 {
+                serial@12000 {
+                        clock-frequency = <200000000>;
+                        status = "ok";
+                };
+
+                nand@3000000 {
+                        status = "ok";
+                        chip-delay = <25>;
+                };
+        };
+};
diff --git a/arch/arm/mach-kirkwood/Kconfig b/arch/arm/mach-kirkwood/Kconfig
index d033b7acead7..50bca5032b7e 100644
--- a/arch/arm/mach-kirkwood/Kconfig
+++ b/arch/arm/mach-kirkwood/Kconfig
@@ -123,6 +123,13 @@ config MACH_IOMEGA_IX2_200_DT
           Say 'Y' here if you want your kernel to support the
           Iomega StorCenter ix2-200 (Flattened Device Tree).
 
+config MACH_KM_KIRKWOOD_DT
+        bool "Keymile Kirkwood Reference Design (Flattened Device Tree)"
+        select ARCH_KIRKWOOD_DT
+        help
+          Say 'Y' here if you want your kernel to support the
+          Keymile Kirkwood Reference Desgin, using Flattened Device Tree.
+
 config MACH_TS219
         bool "QNAP TS-110, TS-119, TS-119P+, TS-210, TS-219, TS-219P and TS-219P+ Turbo NAS"
         help
diff --git a/arch/arm/mach-kirkwood/Makefile b/arch/arm/mach-kirkwood/Makefile
index d809cd542a00..294779f892d9 100644
--- a/arch/arm/mach-kirkwood/Makefile
+++ b/arch/arm/mach-kirkwood/Makefile
@@ -30,3 +30,4 @@ obj-$(CONFIG_MACH_DOCKSTAR_DT)		+= board-dockstar.o
 obj-$(CONFIG_MACH_GOFLEXNET_DT)         += board-goflexnet.o
 obj-$(CONFIG_MACH_LSXL_DT)              += board-lsxl.o
 obj-$(CONFIG_MACH_IOMEGA_IX2_200_DT)    += board-iomega_ix2_200.o
+obj-$(CONFIG_MACH_KM_KIRKWOOD_DT)       += board-km_kirkwood.o
diff --git a/arch/arm/mach-kirkwood/Makefile.boot b/arch/arm/mach-kirkwood/Makefile.boot
index 892ce4c8d36c..5edef8ef34bf 100644
--- a/arch/arm/mach-kirkwood/Makefile.boot
+++ b/arch/arm/mach-kirkwood/Makefile.boot
@@ -14,3 +14,4 @@ dtb-$(CONFIG_MACH_LSXL_DT) += kirkwood-lschlv2.dtb
 dtb-$(CONFIG_MACH_LSXL_DT) += kirkwood-lsxhl.dtb
 dtb-$(CONFIG_MACH_IOMEGA_IX2_200_DT) += kirkwood-iomega_ix2_200.dtb
 dtb-$(CONFIG_MACH_DOCKSTAR_DT) += kirkwood-dockstar.dtb
+dtb-$(CONFIG_MACH_KM_KIRKWOOD_DT) += kirkwood-km_kirkwood.dtb
diff --git a/arch/arm/mach-kirkwood/board-dt.c b/arch/arm/mach-kirkwood/board-dt.c
index 30a4caa2b76c..496554664e08 100644
--- a/arch/arm/mach-kirkwood/board-dt.c
+++ b/arch/arm/mach-kirkwood/board-dt.c
@@ -93,6 +93,9 @@ static void __init kirkwood_dt_init(void)
         if (of_machine_is_compatible("iom,ix2-200"))
                 iomega_ix2_200_init();
 
+        if (of_machine_is_compatible("keymile,km_kirkwood"))
+                km_kirkwood_init();
+
         of_platform_populate(NULL, kirkwood_dt_match_table,
                              kirkwood_auxdata_lookup, NULL);
 }
@@ -108,6 +111,7 @@ static const char *kirkwood_dt_board_compat[] = {
         "seagate,goflexnet",
         "buffalo,lsxl",
         "iom,ix2-200",
+        "keymile,km_kirkwood",
         NULL
 };
 
diff --git a/arch/arm/mach-kirkwood/board-km_kirkwood.c b/arch/arm/mach-kirkwood/board-km_kirkwood.c
new file mode 100644
index 000000000000..f7d32834b757
--- /dev/null
+++ b/arch/arm/mach-kirkwood/board-km_kirkwood.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2012 2012 KEYMILE AG, CH-3097 Bern
+ * Valentin Longchamp <valentin.longchamp@keymile.com>
+ *
+ * arch/arm/mach-kirkwood/board-km_kirkwood.c
+ *
+ * Keymile km_kirkwood Reference Desing Init for drivers not converted to
+ * flattened device tree yet.
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/mv643xx_eth.h>
+#include <linux/clk.h>
+#include <linux/clk-private.h>
+#include "common.h"
+#include "mpp.h"
+
+static struct mv643xx_eth_platform_data km_kirkwood_ge00_data = {
+        .phy_addr       = MV643XX_ETH_PHY_ADDR(0),
+};
+
+static unsigned int km_kirkwood_mpp_config[] __initdata = {
+        MPP8_GPIO,      /* I2C SDA */
+        MPP9_GPIO,      /* I2C SCL */
+        0
+};
+
+void __init km_kirkwood_init(void)
+{
+        struct clk *sata_clk;
+        /*
+         * Basic setup. Needs to be called early.
+         */
+        kirkwood_mpp_conf(km_kirkwood_mpp_config);
+
+        /*
+         * Our variant of kirkwood (integrated in the Bobcat) hangs on accessing
+         * SATA bits (14-15) of the Clock Gating Control Register. Since these
+         * devices are also not present in this variant, their clocks get
+         * disabled because unused when clk_disable_unused() gets called.
+         * That's why we change the flags to these clocks to CLK_IGNORE_UNUSED
+         */
+        sata_clk = clk_get_sys("sata_mv.0", "0");
+        if (!IS_ERR(sata_clk))
+                sata_clk->flags |= CLK_IGNORE_UNUSED;
+        sata_clk = clk_get_sys("sata_mv.0", "1");
+        if (!IS_ERR(sata_clk))
+                sata_clk->flags |= CLK_IGNORE_UNUSED;
+
+        kirkwood_ehci_init();
+        kirkwood_ge00_init(&km_kirkwood_ge00_data);
+}
diff --git a/arch/arm/mach-kirkwood/common.h b/arch/arm/mach-kirkwood/common.h
index 8f2520fa0562..bcffd7ca1ca2 100644
--- a/arch/arm/mach-kirkwood/common.h
+++ b/arch/arm/mach-kirkwood/common.h
@@ -106,6 +106,12 @@ void iomega_ix2_200_init(void);
 static inline void iomega_ix2_200_init(void) {};
 #endif
 
+#ifdef CONFIG_MACH_KM_KIRKWOOD_DT
+void km_kirkwood_init(void);
+#else
+static inline void km_kirkwood_init(void) {};
+#endif
+
 /* early init functions not converted to fdt yet */
 char *kirkwood_id(void);
 void kirkwood_l2_init(void);