ARM: shmobile: kzm9g: Reference DT implementation

Provide alternate board code for the kzm9g to demonstrate
how DT may be used given the current state of driver
device tree support. This is intended to act as a reference
for mach-shmobile developers.

Some notes:

* Brings up the GIC interrupt handler using device tree
* Brings up the following device using device tree:
  - MMCIF (MMC)
* Does not bring up the INTC interrupt controller at all,
  thus external devices may not be used. In particular,
  the SMSC ethernet device may not be used and thus
  NFS root may not be used.
* Uses existing C code and not device tree to initialise the following,
  which are needed for a working board:
  - SCIF (Serial)
  - CMT (Clock)
  - PFC (GPIO)

To use this alternate board code instead of the normal board code,
CONFIG_MACH_KZM9G_REFERENCE should be selected in the kernel config.
And the sh73a0-kzm9g-reference.dtb flattened device tree blob should be used.

Includes fix by Thierry Reding to no longer use gic_handle_irq()

Includes fixes by Guennadi Liakhovetski for recent pinmux changes.

Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

1 files changed, 87 insertions, 0 deletions

diff --git a/arch/arm/mach-shmobile/board-kzm9g-reference.c b/arch/arm/mach-shmobile/board-kzm9g-reference.c
new file mode 100644
index 000000000000..caba1bb62f84
--- /dev/null
+++ b/arch/arm/mach-shmobile/board-kzm9g-reference.c
@@ -0,0 +1,87 @@
+/*
+ * KZM-A9-GT board support - Reference Device Tree Implementation
+ *
+ * Copyright (C) 2012	Horms Solutions Ltd.
+ *
+ * Based on board-kzm9g.c
+ * Copyright (C) 2012	Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/irqchip.h>
+#include <linux/input.h>
+#include <linux/of_platform.h>
+#include <linux/pinctrl/machine.h>
+#include <mach/sh73a0.h>
+#include <mach/common.h>
+#include <asm/hardware/cache-l2x0.h>
+#include <asm/mach-types.h>
+#include <asm/mach/arch.h>
+
+static const struct pinctrl_map kzm_pinctrl_map[] = {
+	PIN_MAP_MUX_GROUP_DEFAULT("i2c-sh_mobile.3", "pfc-sh73a0",
+				  "i2c3_1", "i2c3"),
+	PIN_MAP_MUX_GROUP_DEFAULT("sh-sci.4", "pfc-sh73a0",
+				  "scifa4_data", "scifa4"),
+	PIN_MAP_MUX_GROUP_DEFAULT("sh-sci.4", "pfc-sh73a0",
+				  "scifa4_ctrl", "scifa4"),
+};
+
+static void __init kzm_init(void)
+{
+	sh73a0_add_standard_devices_dt();
+	pinctrl_register_mappings(kzm_pinctrl_map, ARRAY_SIZE(kzm_pinctrl_map));
+
+#ifdef CONFIG_CACHE_L2X0
+	/* Early BRESP enable, Shared attribute override enable, 64K*8way */
+	l2x0_init(IOMEM(0xf0100000), 0x40460000, 0x82000fff);
+#endif
+}
+
+static void kzm9g_restart(char mode, const char *cmd)
+{
+#define RESCNT2 IOMEM(0xe6188020)
+	/* Do soft power on reset */
+	writel((1 << 31), RESCNT2);
+}
+
+static const char *kzm9g_boards_compat_dt[] __initdata = {
+	"renesas,kzm9g-reference",
+	NULL,
+};
+
+/* Please note that the clock initialisation shcheme used in
+ * sh73a0_add_early_devices_dt() and sh73a0_add_standard_devices_dt()
+ * does not work with SMP as there is a yet to be resolved lock-up in
+ * workqueue initialisation.
+ *
+ * CONFIG_SMP should be disabled when using this code.
+ */
+DT_MACHINE_START(KZM9G_DT, "kzm9g-reference")
+	.smp		= smp_ops(sh73a0_smp_ops),
+	.map_io		= sh73a0_map_io,
+	.init_early	= sh73a0_init_delay,
+	.nr_irqs	= NR_IRQS_LEGACY,
+	.init_irq	= irqchip_init,
+	.init_machine	= kzm_init,
+	.init_late	= shmobile_init_late,
+	.init_time	= shmobile_timer_init,
+	.restart	= kzm9g_restart,
+	.dt_compat	= kzm9g_boards_compat_dt,
+MACHINE_END