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ARM: shmobile: kzm9g: Reference DT implementation

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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>
This commit is contained in:
Simon Horman 2012-11-22 00:34:25 +09:00
parent 73d6a69e3b
commit b8b82b2983
5 changed files with 140 additions and 0 deletions
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1
arch/arm/boot/dts/Makefile
View file

@ -138,6 +138,7 @@ dtb-$(CONFIG_ARCH_SHMOBILE) += emev2-kzm9d.dtb \
r8a7740-armadillo800eva.dtb \
r8a7779-marzen-reference.dtb \
sh73a0-kzm9g.dtb \
sh73a0-kzm9g-reference.dtb \
sh7372-mackerel.dtb
dtb-$(CONFIG_ARCH_SOCFPGA) += socfpga_cyclone5.dtb \
socfpga_vt.dtb

41
arch/arm/boot/dts/sh73a0-kzm9g-reference.dts Normal file
View file

@ -0,0 +1,41 @@
/*
* Device Tree Source for the KZM-A9-GT board
*
* Copyright (C) 2012 Horms Solutions Ltd.
*
* Based on sh73a0-kzm9g.dts
* Copyright (C) 2012 Renesas Solutions Corp.
*
* 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.
*/
/dts-v1/;
/include/ "sh73a0-reference.dtsi"
/ {
model = "KZM-A9-GT";
compatible = "renesas,kzm9g-reference", "renesas,sh73a0";
chosen {
bootargs = "console=tty0 console=ttySC4,115200 root=/dev/nfs ip=dhcp ignore_loglevel earlyprintk=sh-sci.4,115200";
};
memory {
device_type = "memory";
reg = <0x41000000 0x1e800000>;
};
fixedregulator1v8: fixedregulator@0 {
compatible = "regulator-fixed";
regulator-name = "fixed-1.8V";
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
};
};
&mmcif {
vmmc-supply = <&fixedregulator1v8>;
vqmmc-supply = <&fixedregulator1v8>;
};

10
arch/arm/mach-shmobile/Kconfig
View file

@ -129,6 +129,16 @@ config MACH_KZM9G
select SND_SOC_AK4642 if SND_SIMPLE_CARD
select USE_OF
config MACH_KZM9G_REFERENCE
bool "KZM-A9-GT board - Reference Device Tree Implementation"
depends on MACH_KZM9G
---help---
Use reference implementation of KZM-A9-GT board support
which makes as greater use of device tree at the expense
of not supporting a number of devices.
This is intended to aid developers
comment "SH-Mobile System Configuration"
config CPU_HAS_INTEVT

1
arch/arm/mach-shmobile/Makefile
View file

@ -42,6 +42,7 @@ obj-$(CONFIG_MACH_MARZEN_REFERENCE) += board-marzen-reference.o
obj-$(CONFIG_MACH_ARMADILLO800EVA) += board-armadillo800eva.o
obj-$(CONFIG_MACH_KZM9D) += board-kzm9d.o
obj-$(CONFIG_MACH_KZM9G) += board-kzm9g.o
obj-$(CONFIG_MACH_KZM9G_REFERENCE) += board-kzm9g-reference.o
# Framework support
obj-$(CONFIG_SMP) += $(smp-y)

87
arch/arm/mach-shmobile/board-kzm9g-reference.c Normal file
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@ -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