arm: orion5x: basic Device Tree support

This commit adds basic DT support for the Orion5x SoC family. It adds
an orion5x.dtsi description of the Orion5x SoC as well as the needed
DT_MACHINE structure to support boards converted to DT in the future.

So far, the Device Tree contains the interrupt controller, the GPIO
bank, the UART controllers, the SPI controller, the watchdog, the SATA
controller, the I2C controller and the cryptographic engine.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Tested by: Maxime Hadjinlian <mhadjinlian@lacie.com>
Acked-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

5 files changed, 89 insertions, 2 deletions

diff --git a/arch/arm/mach-orion5x/Kconfig b/arch/arm/mach-orion5x/Kconfig
index 0673f0c10432..0910c3bd0c99 100644
--- a/arch/arm/mach-orion5x/Kconfig
+++ b/arch/arm/mach-orion5x/Kconfig
@@ -2,6 +2,13 @@ if ARCH_ORION5X
 
 menu "Orion Implementations"
 
+config ARCH_ORION5X_DT
+        bool "Marvell Orion5x Flattened Device Tree"
+        select USE_OF
+        help
+          Say 'Y' here if you want your kernel to support the
+          Marvell Orion5x using flattened device tree.
+
 config MACH_DB88F5281
         bool "Marvell Orion-2 Development Board"
         select I2C_BOARDINFO
diff --git a/arch/arm/mach-orion5x/Makefile b/arch/arm/mach-orion5x/Makefile
index 7f18cdacd487..843e6deb66d0 100644
--- a/arch/arm/mach-orion5x/Makefile
+++ b/arch/arm/mach-orion5x/Makefile
@@ -22,3 +22,5 @@ obj-$(CONFIG_MACH_RD88F5181L_GE)	+= rd88f5181l-ge-setup.o
 obj-$(CONFIG_MACH_RD88F5181L_FXO)       += rd88f5181l-fxo-setup.o
 obj-$(CONFIG_MACH_RD88F6183AP_GE)       += rd88f6183ap-ge-setup.o
 obj-$(CONFIG_MACH_LINKSTATION_LSCHL)    += ls-chl-setup.o
+
+obj-$(CONFIG_ARCH_ORION5X_DT)           += board-dt.o
diff --git a/arch/arm/mach-orion5x/board-dt.c b/arch/arm/mach-orion5x/board-dt.c
new file mode 100644
index 000000000000..a26397f58f1f
--- /dev/null
+++ b/arch/arm/mach-orion5x/board-dt.c
@@ -0,0 +1,76 @@
+/*
+ * Copyright 2012 (C), Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+ *
+ * arch/arm/mach-orion5x/board-dt.c
+ *
+ * Flattened Device Tree board initialization
+ *
+ * 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/of.h>
+#include <linux/of_platform.h>
+#include <asm/system_misc.h>
+#include <asm/mach/arch.h>
+#include <mach/orion5x.h>
+#include <plat/irq.h>
+#include "common.h"
+
+struct of_dev_auxdata orion5x_auxdata_lookup[] __initdata = {
+        OF_DEV_AUXDATA("marvell,orion-spi", 0xf1010600, "orion_spi.0", NULL),
+        OF_DEV_AUXDATA("marvell,mv64xxx-i2c", 0xf1011000, "mv64xxx_i2c.0",
+                       NULL),
+        OF_DEV_AUXDATA("marvell,orion-wdt", 0xf1020300, "orion_wdt", NULL),
+        OF_DEV_AUXDATA("marvell,orion-sata", 0xf1080000, "sata_mv.0", NULL),
+        OF_DEV_AUXDATA("marvell,orion-crypto", 0xf1090000, "mv_crypto", NULL),
+        {},
+};
+
+static void __init orion5x_dt_init(void)
+{
+        char *dev_name;
+        u32 dev, rev;
+
+        orion5x_id(&dev, &rev, &dev_name);
+        printk(KERN_INFO "Orion ID: %s. TCLK=%d.\n", dev_name, orion5x_tclk);
+
+        /*
+         * Setup Orion address map
+         */
+        orion5x_setup_cpu_mbus_bridge();
+
+        /* Setup root of clk tree */
+        clk_init();
+
+        /*
+         * Don't issue "Wait for Interrupt" instruction if we are
+         * running on D0 5281 silicon.
+         */
+        if (dev == MV88F5281_DEV_ID && rev == MV88F5281_REV_D0) {
+                printk(KERN_INFO "Orion: Applying 5281 D0 WFI workaround.\n");
+                disable_hlt();
+        }
+
+        of_platform_populate(NULL, of_default_bus_match_table,
+                             orion5x_auxdata_lookup, NULL);
+}
+
+static const char *orion5x_dt_compat[] = {
+        "marvell,orion5x",
+        NULL,
+};
+
+DT_MACHINE_START(ORION5X_DT, "Marvell Orion5x (Flattened Device Tree)")
+        /* Maintainer: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> */
+        .map_io         = orion5x_map_io,
+        .init_early     = orion5x_init_early,
+        .init_irq       = orion_dt_init_irq,
+        .timer          = &orion5x_timer,
+        .init_machine   = orion5x_dt_init,
+        .restart        = orion5x_restart,
+        .dt_compat      = orion5x_dt_compat,
+MACHINE_END
diff --git a/arch/arm/mach-orion5x/common.c b/arch/arm/mach-orion5x/common.c
index b3eb3da01160..550f92320afb 100644
--- a/arch/arm/mach-orion5x/common.c
+++ b/arch/arm/mach-orion5x/common.c
@@ -65,7 +65,7 @@ void __init orion5x_map_io(void)
  ****************************************************************************/
 static struct clk *tclk;
 
-static void __init clk_init(void)
+void __init clk_init(void)
 {
         tclk = clk_register_fixed_rate(NULL, "tclk", NULL, CLK_IS_ROOT,
                                        orion5x_tclk);
@@ -236,7 +236,7 @@ struct sys_timer orion5x_timer = {
 /*
  * Identify device ID and rev from PCIe configuration header space '0'.
  */
-static void __init orion5x_id(u32 *dev, u32 *rev, char **dev_name)
+void __init orion5x_id(u32 *dev, u32 *rev, char **dev_name)
 {
         orion5x_pcie_id(dev, rev);
 
diff --git a/arch/arm/mach-orion5x/common.h b/arch/arm/mach-orion5x/common.h
index 31bab92ce038..2033b79089a7 100644
--- a/arch/arm/mach-orion5x/common.h
+++ b/arch/arm/mach-orion5x/common.h
@@ -12,6 +12,8 @@ void orion5x_map_io(void);
 void orion5x_init_early(void);
 void orion5x_init_irq(void);
 void orion5x_init(void);
+void orion5x_id(u32 *dev, u32 *rev, char **dev_name);
+void clk_init(void);
 extern int orion5x_tclk;
 extern struct sys_timer orion5x_timer;