ARM: remove tango platform

The smp8758 (tango4) SoC was the last generation of set-top-box chips
to come out of Sigma Designs, and support was added by Marc Gonzalez
and Måns Rullgård between 2015 and 2017, before the company went out of
business and the products were abandoned.

The chip is used in some set-top-boxes such as the Popcorn Hour A-500,
which could have seen some adoption by hobbyists. This has not happened
in the past four years, and support for the more widely used MIPS based
SoCs was never merged at all.

Thanks to Marc and Måns for maintaining for the past years even after the
death of the platform.

Cc: Marc Gonzalez <marc.w.gonzalez@free.fr>
Cc: Mans Rullgard <mans@mansr.com>
Link: https://lore.kernel.org/lkml/2d643ebc-09af-a809-eb3f-2aec8ecee501@free.fr/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

8 files changed, 0 insertions, 148 deletions

diff --git a/arch/arm/mach-tango/Kconfig b/arch/arm/mach-tango/Kconfig
deleted file mode 100644
index a9eeda36aeb1..000000000000
--- a/arch/arm/mach-tango/Kconfig
+++ /dev/null
@@ -1,13 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-config ARCH_TANGO
-	bool "Sigma Designs Tango4 (SMP87xx)"
-	depends on ARCH_MULTI_V7
-	# Cortex-A9 MPCore r3p0, PL310 r3p2
-	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
diff --git a/arch/arm/mach-tango/Makefile b/arch/arm/mach-tango/Makefile
deleted file mode 100644
index 97cd04508fa1..000000000000
--- a/arch/arm/mach-tango/Makefile
+++ /dev/null
@@ -1,4 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-obj-y += setup.o smc.o
-obj-$(CONFIG_SMP) += platsmp.o
-obj-$(CONFIG_SUSPEND) += pm.o
diff --git a/arch/arm/mach-tango/platsmp.c b/arch/arm/mach-tango/platsmp.c
deleted file mode 100644
index 65012afbc1a3..000000000000
--- a/arch/arm/mach-tango/platsmp.c
+++ /dev/null
@@ -1,52 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <linux/delay.h>
-#include <linux/init.h>
-#include <linux/smp.h>
-#include "smc.h"
-
-static int tango_boot_secondary(unsigned int cpu, struct task_struct *idle)
-{
-	tango_set_aux_boot_addr(__pa_symbol(secondary_startup));
-	tango_start_aux_core(cpu);
-	return 0;
-}
-
-#ifdef CONFIG_HOTPLUG_CPU
-/*
- * cpu_kill() and cpu_die() run concurrently on different cores.
- * Firmware will only "kill" a core once it has properly "died".
- * Try a few times to kill a core before giving up, and sleep
- * between tries to give that core enough time to die.
- */
-static int tango_cpu_kill(unsigned int cpu)
-{
-	int i, err;
-
-	for (i = 0; i < 10; ++i) {
-		msleep(10);
-		err = tango_aux_core_kill(cpu);
-		if (!err)
-			return true;
-	}
-
-	return false;
-}
-
-static void tango_cpu_die(unsigned int cpu)
-{
-	while (tango_aux_core_die(cpu) < 0)
-		cpu_relax();
-
-	panic("cpu %d failed to die\n", cpu);
-}
-#endif
-
-static const struct smp_operations tango_smp_ops __initconst = {
-	.smp_boot_secondary	= tango_boot_secondary,
-#ifdef CONFIG_HOTPLUG_CPU
-	.cpu_kill		= tango_cpu_kill,
-	.cpu_die		= tango_cpu_die,
-#endif
-};
-
-CPU_METHOD_OF_DECLARE(tango4_smp, "sigma,tango4-smp", &tango_smp_ops);
diff --git a/arch/arm/mach-tango/pm.c b/arch/arm/mach-tango/pm.c
deleted file mode 100644
index a32c3b631484..000000000000
--- a/arch/arm/mach-tango/pm.c
+++ /dev/null
@@ -1,31 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <linux/init.h>
-#include <linux/suspend.h>
-#include <asm/suspend.h>
-#include "smc.h"
-#include "pm.h"
-
-static int tango_pm_powerdown(unsigned long arg)
-{
-	tango_suspend(__pa_symbol(cpu_resume));
-
-	return -EIO; /* tango_suspend has failed */
-}
-
-static int tango_pm_enter(suspend_state_t state)
-{
-	if (state == PM_SUSPEND_MEM)
-		return cpu_suspend(0, tango_pm_powerdown);
-
-	return -EINVAL;
-}
-
-static const struct platform_suspend_ops tango_pm_ops = {
-	.enter = tango_pm_enter,
-	.valid = suspend_valid_only_mem,
-};
-
-void __init tango_pm_init(void)
-{
-	suspend_set_ops(&tango_pm_ops);
-}
diff --git a/arch/arm/mach-tango/pm.h b/arch/arm/mach-tango/pm.h
deleted file mode 100644
index 35ea705a0ee2..000000000000
--- a/arch/arm/mach-tango/pm.h
+++ /dev/null
@@ -1,7 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-
-#ifdef CONFIG_SUSPEND
-void __init tango_pm_init(void);
-#else
-#define tango_pm_init NULL
-#endif
diff --git a/arch/arm/mach-tango/setup.c b/arch/arm/mach-tango/setup.c
deleted file mode 100644
index 824f90737b04..000000000000
--- a/arch/arm/mach-tango/setup.c
+++ /dev/null
@@ -1,20 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <asm/mach/arch.h>
-#include <asm/hardware/cache-l2x0.h>
-#include "smc.h"
-#include "pm.h"
-
-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,
-	.init_late	= tango_pm_init,
-MACHINE_END
diff --git a/arch/arm/mach-tango/smc.S b/arch/arm/mach-tango/smc.S
deleted file mode 100644
index b1752aaa72bc..000000000000
--- a/arch/arm/mach-tango/smc.S
+++ /dev/null
@@ -1,12 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#include <linux/linkage.h>
-
-	.arch armv7-a
-	.arch_extension sec
-ENTRY(tango_smc)
-	push	{lr}
-	mov	ip, r1
-	dsb	/* This barrier is probably unnecessary */
-	smc	#0
-	pop	{pc}
-ENDPROC(tango_smc)
diff --git a/arch/arm/mach-tango/smc.h b/arch/arm/mach-tango/smc.h
deleted file mode 100644
index 455ce3e06daf..000000000000
--- a/arch/arm/mach-tango/smc.h
+++ /dev/null
@@ -1,9 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-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(val, 0x105)
-#define tango_suspend(val)		tango_smc(val, 0x120)
-#define tango_aux_core_die(val)		tango_smc(val, 0x121)
-#define tango_aux_core_kill(val)	tango_smc(val, 0x122)