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ARM: tango4: Initial platform support 

Support Sigma Designs ARM-based (specifically, Cortex-A9 MPCore r3p0)
Tango4 "Secure Media Processor" platforms: smp8756, smp8758, smp8759
(8756 is single-core, the latter are dual-core).

Note: 8758 vs 8759: same chip, different package.

Support for older MIPS-based platforms can be found elsewhere:
https://github.com/mansr/linux-tangox

Signed-off-by: Marc Gonzalez <marc_gonzalez@sigmadesigns.com>
Reviewed-by: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Olof Johansson <olof@lixom.net>
This commit is contained in:
Marc Gonzalez 2015-12-15 10:41:13 +01:00 committed by Olof Johansson
parent 9d67d4624f
commit d6de5b0294
8 changed files with 69 additions and 0 deletions
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7
MAINTAINERS
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@ -1588,6 +1588,13 @@ T: git git://git.kernel.org/pub/scm/linux/kernel/git/mcoquelin/stm32.git
N: stm32
F: drivers/clocksource/armv7m_systick.c
ARM/TANGO ARCHITECTURE
M: Marc Gonzalez <marc_gonzalez@sigmadesigns.com>
L: linux-arm-kernel@lists.infradead.org
S: Maintained
F: arch/arm/mach-tango/
F: arch/arm/boot/dts/tango*
ARM/TECHNOLOGIC SYSTEMS TS7250 MACHINE SUPPORT
M: Lennert Buytenhek <kernel@wantstofly.org>
L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)

2
arch/arm/Kconfig
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@ -919,6 +919,8 @@ source "arch/arm/mach-sunxi/Kconfig"
source "arch/arm/mach-prima2/Kconfig"
source "arch/arm/mach-tango/Kconfig"
source "arch/arm/mach-tegra/Kconfig"
source "arch/arm/mach-u300/Kconfig"

1
arch/arm/Makefile
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@ -211,6 +211,7 @@ machine-$(CONFIG_ARCH_SOCFPGA) += socfpga
machine-$(CONFIG_ARCH_STI) += sti
machine-$(CONFIG_ARCH_STM32) += stm32
machine-$(CONFIG_ARCH_SUNXI) += sunxi
machine-$(CONFIG_ARCH_TANGO) += tango
machine-$(CONFIG_ARCH_TEGRA) += tegra
machine-$(CONFIG_ARCH_U300) += u300
machine-$(CONFIG_ARCH_U8500) += ux500

12
arch/arm/mach-tango/Kconfig Normal file
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@ -0,0 +1,12 @@
config ARCH_TANGO
bool "Sigma Designs Tango4 (SMP87xx)" if ARCH_MULTI_V7
# Cortex-A9 MPCore r3p0, PL310 r3p2
select ARCH_HAS_HOLES_MEMORYMODEL
select ARM_ERRATA_754322
select ARM_ERRATA_764369 if SMP
select ARM_ERRATA_775420
select ARM_GIC
select CLKSRC_TANGO_XTAL
select HAVE_ARM_SCU
select HAVE_ARM_TWD
select TANGO_IRQ

2
arch/arm/mach-tango/Makefile Normal file
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@ -0,0 +1,2 @@
asflags-y += -mcpu=cortex-a9
obj-y += setup.o smc.o

31
arch/arm/mach-tango/setup.c Normal file
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@ -0,0 +1,31 @@
#include <linux/smp.h>
#include <asm/mach/arch.h>
#include <asm/hardware/cache-l2x0.h>
#include "smc.h"
static int tango4_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
tango_set_aux_boot_addr(virt_to_phys(secondary_startup));
tango_start_aux_core(cpu);
return 0;
}
static struct smp_operations tango4_smp_ops __initdata = {
.smp_boot_secondary = tango4_boot_secondary,
};
CPU_METHOD_OF_DECLARE(tango4_smp, "sigma,tango4-smp", &tango4_smp_ops);
static void tango_l2c_write(unsigned long val, unsigned int reg)
{
if (reg == L2X0_CTRL)
tango_set_l2_control(val);
}
static const char *const tango_dt_compat[] = { "sigma,tango4", NULL };
DT_MACHINE_START(TANGO_DT, "Sigma Tango DT")
.dt_compat = tango_dt_compat,
.l2c_aux_mask = ~0,
.l2c_write_sec = tango_l2c_write,
MACHINE_END

9
arch/arm/mach-tango/smc.S Normal file
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@ -0,0 +1,9 @@
#include <linux/linkage.h>
ENTRY(tango_smc)
push {lr}
mov ip, r1
dsb /* This barrier is probably unnecessary */
smc #0
pop {pc}
ENDPROC(tango_smc)

5
arch/arm/mach-tango/smc.h Normal file
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@ -0,0 +1,5 @@
extern int tango_smc(unsigned int val, unsigned int service);
#define tango_set_l2_control(val) tango_smc(val, 0x102)
#define tango_start_aux_core(val) tango_smc(val, 0x104)
#define tango_set_aux_boot_addr(val) tango_smc((unsigned int)val, 0x105)