ARM: remove zte zx platform

The ZTE ZX set-top-box SoC platform was added in 2015 by Jun Nie, with
Baoyou Xie and Shawn Guo subsequently becoming maintainers after the
addition of the 64-bit variant.

However, the only machines that were ever supported upstream are the
reference designs, not actual set-top-box devices that would benefit
from this support. All ZTE set-top-boxes from the past few years seem
to be based on third-party SoCs. While there is very little information
about zx296702 and zx296718 on the web, I found some references to other
chips from the same family, such as zx296716 and zx296719, which were
never submitted for upstream support. Finally, there is no support for
the GPU on either of them, with the lima and panfrost device drivers
having been added after work on the zx platform had stopped.

Shawn confirmed that he has not seen any interest in this platform for
the past four years, and that it can be removed.

Thanks to Jun and Shawn for maintaining this platform over the past
five years.

Cc: Jun Nie <jun.nie@linaro.org>
Cc: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

7 files changed, 0 insertions, 480 deletions

diff --git a/arch/arm/mach-zx/Kconfig b/arch/arm/mach-zx/Kconfig
deleted file mode 100644
index ea29c84a7849..000000000000
--- a/arch/arm/mach-zx/Kconfig
+++ /dev/null
@@ -1,21 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-menuconfig ARCH_ZX
-	bool "ZTE ZX family"
-	depends on ARCH_MULTI_V7
-	help
-	  Support for ZTE ZX-based family of processors. TV
-	  set-top-box processor is supported. More will be
-	  added soon.
-
-if ARCH_ZX
-
-config SOC_ZX296702
-	def_bool y
-	select ARM_GIC
-	select ARM_GLOBAL_TIMER
-	select HAVE_ARM_SCU if SMP
-	select HAVE_ARM_TWD if SMP
-	select PM_GENERIC_DOMAINS if PM
-	help
-	  Support for ZTE ZX296702 SoC which is a dual core CortexA9MP
-endif
diff --git a/arch/arm/mach-zx/Makefile b/arch/arm/mach-zx/Makefile
deleted file mode 100644
index 6f8930cdb8fb..000000000000
--- a/arch/arm/mach-zx/Makefile
+++ /dev/null
@@ -1,3 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0-only
-obj-$(CONFIG_SOC_ZX296702) += zx296702.o zx296702-pm-domain.o
-obj-$(CONFIG_SMP) += headsmp.o platsmp.o
diff --git a/arch/arm/mach-zx/core.h b/arch/arm/mach-zx/core.h
deleted file mode 100644
index 25fe873892c9..000000000000
--- a/arch/arm/mach-zx/core.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Copyright 2014 Linaro Ltd.
- * Copyright (C) 2014 ZTE Corporation.
- */
-
-#ifndef __MACH_ZX_CORE_H
-#define __MACH_ZX_CORE_H
-
-extern void zx_resume_jump(void);
-extern size_t zx_suspend_iram_sz;
-extern unsigned long zx_secondary_startup_pa;
-
-void zx_secondary_startup(void);
-
-#endif /* __MACH_ZX_CORE_H */
diff --git a/arch/arm/mach-zx/headsmp.S b/arch/arm/mach-zx/headsmp.S
deleted file mode 100644
index 0846859b0573..000000000000
--- a/arch/arm/mach-zx/headsmp.S
+++ /dev/null
@@ -1,30 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Copyright 2014 Linaro Ltd.
- * Copyright (C) 2014 ZTE Corporation.
- */
-
-#include <linux/linkage.h>
-
-	.align 3
-	.arm
-
-/* It runs from physical address */
-ENTRY(zx_resume_jump)
-	adr	r1, zx_secondary_startup_pa
-	ldr	r0, [r1]
-	bx	r0
-ENDPROC(zx_resume_jump)
-
-ENTRY(zx_secondary_startup_pa)
-	.word	zx_secondary_startup_pa
-
-ENTRY(zx_suspend_iram_sz)
-        .word	. - zx_resume_jump
-ENDPROC(zx_secondary_startup_pa)
-
-
-ENTRY(zx_secondary_startup)
-	bl	v7_invalidate_l1
-	b	secondary_startup
-ENDPROC(zx_secondary_startup)
diff --git a/arch/arm/mach-zx/platsmp.c b/arch/arm/mach-zx/platsmp.c
deleted file mode 100644
index d4e1d3792224..000000000000
--- a/arch/arm/mach-zx/platsmp.c
+++ /dev/null
@@ -1,186 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright 2014 Linaro Ltd.
- * Copyright (C) 2014 ZTE Corporation.
- */
-
-#include <linux/delay.h>
-#include <linux/errno.h>
-#include <linux/init.h>
-#include <linux/io.h>
-#include <linux/jiffies.h>
-#include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/smp.h>
-
-#include <asm/cacheflush.h>
-#include <asm/cp15.h>
-#include <asm/fncpy.h>
-#include <asm/proc-fns.h>
-#include <asm/smp_scu.h>
-#include <asm/smp_plat.h>
-
-#include "core.h"
-
-#define AON_SYS_CTRL_RESERVED1		0xa8
-
-#define BUS_MATRIX_REMAP_CONFIG		0x00
-
-#define PCU_CPU0_CTRL			0x00
-#define PCU_CPU1_CTRL			0x04
-#define PCU_CPU1_ST			0x0c
-#define PCU_GLOBAL_CTRL			0x14
-#define PCU_EXPEND_CONTROL		0x34
-
-#define ZX_IRAM_BASE			0x00200000
-
-static void __iomem *pcu_base;
-static void __iomem *matrix_base;
-static void __iomem *scu_base;
-
-void __init zx_smp_prepare_cpus(unsigned int max_cpus)
-{
-	struct device_node *np;
-	unsigned long base = 0;
-	void __iomem *aonsysctrl_base;
-	void __iomem *sys_iram;
-
-	base = scu_a9_get_base();
-	scu_base = ioremap(base, SZ_256);
-	if (!scu_base) {
-		pr_err("%s: failed to map scu\n", __func__);
-		return;
-	}
-
-	scu_enable(scu_base);
-
-	np = of_find_compatible_node(NULL, NULL, "zte,sysctrl");
-	if (!np) {
-		pr_err("%s: failed to find sysctrl node\n", __func__);
-		return;
-	}
-
-	aonsysctrl_base = of_iomap(np, 0);
-	if (!aonsysctrl_base) {
-		pr_err("%s: failed to map aonsysctrl\n", __func__);
-		of_node_put(np);
-		return;
-	}
-
-	/*
-	 * Write the address of secondary startup into the
-	 * system-wide flags register. The BootMonitor waits
-	 * until it receives a soft interrupt, and then the
-	 * secondary CPU branches to this address.
-	 */
-	__raw_writel(__pa_symbol(zx_secondary_startup),
-		     aonsysctrl_base + AON_SYS_CTRL_RESERVED1);
-
-	iounmap(aonsysctrl_base);
-	of_node_put(np);
-
-	np = of_find_compatible_node(NULL, NULL, "zte,zx296702-pcu");
-	pcu_base = of_iomap(np, 0);
-	of_node_put(np);
-	WARN_ON(!pcu_base);
-
-	np = of_find_compatible_node(NULL, NULL, "zte,zx-bus-matrix");
-	matrix_base = of_iomap(np, 0);
-	of_node_put(np);
-	WARN_ON(!matrix_base);
-
-	/* Map the first 4 KB IRAM for suspend usage */
-	sys_iram = __arm_ioremap_exec(ZX_IRAM_BASE, PAGE_SIZE, false);
-	zx_secondary_startup_pa = __pa_symbol(zx_secondary_startup);
-	fncpy(sys_iram, &zx_resume_jump, zx_suspend_iram_sz);
-}
-
-static int zx_boot_secondary(unsigned int cpu, struct task_struct *idle)
-{
-	static bool first_boot = true;
-
-	if (first_boot) {
-		arch_send_wakeup_ipi_mask(cpumask_of(cpu));
-		first_boot = false;
-		return 0;
-	}
-
-	/* Swap the base address mapping between IRAM and IROM */
-	writel_relaxed(0x1, matrix_base + BUS_MATRIX_REMAP_CONFIG);
-
-	/* Power on CPU1 */
-	writel_relaxed(0x0, pcu_base + PCU_CPU1_CTRL);
-
-	/* Wait for power on ack */
-	while (readl_relaxed(pcu_base + PCU_CPU1_ST) & 0x4)
-		cpu_relax();
-
-	/* Swap back the mapping of IRAM and IROM */
-	writel_relaxed(0x0, matrix_base + BUS_MATRIX_REMAP_CONFIG);
-
-	return 0;
-}
-
-#ifdef CONFIG_HOTPLUG_CPU
-static inline void cpu_enter_lowpower(void)
-{
-	unsigned int v;
-
-	asm volatile(
-		"mcr	p15, 0, %1, c7, c5, 0\n"
-	"	mcr	p15, 0, %1, c7, c10, 4\n"
-	/*
-	 * Turn off coherency
-	 */
-	"	mrc	p15, 0, %0, c1, c0, 1\n"
-	"	bic	%0, %0, %3\n"
-	"	mcr	p15, 0, %0, c1, c0, 1\n"
-	"	mrc	p15, 0, %0, c1, c0, 0\n"
-	"	bic	%0, %0, %2\n"
-	"	mcr	p15, 0, %0, c1, c0, 0\n"
-	  : "=&r" (v)
-	  : "r" (0), "Ir" (CR_C), "Ir" (0x40)
-	  : "cc");
-}
-
-static int zx_cpu_kill(unsigned int cpu)
-{
-	unsigned long timeout = jiffies + msecs_to_jiffies(2000);
-
-	writel_relaxed(0x2, pcu_base + PCU_CPU1_CTRL);
-
-	while ((readl_relaxed(pcu_base + PCU_CPU1_ST) & 0x3) != 0x0) {
-		if (time_after(jiffies, timeout)) {
-			pr_err("*** cpu1 poweroff timeout\n");
-			break;
-		}
-	}
-	return 1;
-}
-
-static void zx_cpu_die(unsigned int cpu)
-{
-	scu_power_mode(scu_base, SCU_PM_POWEROFF);
-	cpu_enter_lowpower();
-
-	while (1)
-		cpu_do_idle();
-}
-#endif
-
-static void zx_secondary_init(unsigned int cpu)
-{
-	scu_power_mode(scu_base, SCU_PM_NORMAL);
-}
-
-static const struct smp_operations zx_smp_ops __initconst = {
-	.smp_prepare_cpus	= zx_smp_prepare_cpus,
-	.smp_secondary_init	= zx_secondary_init,
-	.smp_boot_secondary	= zx_boot_secondary,
-#ifdef CONFIG_HOTPLUG_CPU
-	.cpu_kill		= zx_cpu_kill,
-	.cpu_die		= zx_cpu_die,
-#endif
-};
-
-CPU_METHOD_OF_DECLARE(zx_smp, "zte,zx296702-smp", &zx_smp_ops);
diff --git a/arch/arm/mach-zx/zx296702-pm-domain.c b/arch/arm/mach-zx/zx296702-pm-domain.c
deleted file mode 100644
index 7a08bf9dd792..000000000000
--- a/arch/arm/mach-zx/zx296702-pm-domain.c
+++ /dev/null
@@ -1,202 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (C) 2015 Linaro Ltd.
- *
- * Author: Jun Nie <jun.nie@linaro.org>
- */
-#include <linux/delay.h>
-#include <linux/err.h>
-#include <linux/io.h>
-#include <linux/of.h>
-#include <linux/platform_device.h>
-#include <linux/pm_domain.h>
-#include <linux/slab.h>
-
-#define PCU_DM_CLKEN        0x18
-#define PCU_DM_RSTEN        0x1C
-#define PCU_DM_ISOEN        0x20
-#define PCU_DM_PWRDN        0x24
-#define PCU_DM_ACK_SYNC     0x28
-
-enum {
-	PCU_DM_NEON0 = 0,
-	PCU_DM_NEON1,
-	PCU_DM_GPU,
-	PCU_DM_DECPPU,
-	PCU_DM_VOU,
-	PCU_DM_R2D,
-	PCU_DM_TOP,
-};
-
-static void __iomem *pcubase;
-
-struct zx_pm_domain {
-	struct generic_pm_domain dm;
-	unsigned int bit;
-};
-
-static int normal_power_off(struct generic_pm_domain *domain)
-{
-	struct zx_pm_domain *zpd = (struct zx_pm_domain *)domain;
-	unsigned long loop = 1000;
-	u32 tmp;
-
-	tmp = readl_relaxed(pcubase + PCU_DM_CLKEN);
-	tmp &= ~BIT(zpd->bit);
-	writel_relaxed(tmp, pcubase + PCU_DM_CLKEN);
-	udelay(5);
-
-	tmp = readl_relaxed(pcubase + PCU_DM_ISOEN);
-	tmp &= ~BIT(zpd->bit);
-	writel_relaxed(tmp | BIT(zpd->bit), pcubase + PCU_DM_ISOEN);
-	udelay(5);
-
-	tmp = readl_relaxed(pcubase + PCU_DM_RSTEN);
-	tmp &= ~BIT(zpd->bit);
-	writel_relaxed(tmp, pcubase + PCU_DM_RSTEN);
-	udelay(5);
-
-	tmp = readl_relaxed(pcubase + PCU_DM_PWRDN);
-	tmp &= ~BIT(zpd->bit);
-	writel_relaxed(tmp | BIT(zpd->bit), pcubase + PCU_DM_PWRDN);
-	do {
-		tmp = readl_relaxed(pcubase + PCU_DM_ACK_SYNC) & BIT(zpd->bit);
-	} while (--loop && !tmp);
-
-	if (!loop) {
-		pr_err("Error: %s %s fail\n", __func__, domain->name);
-		return -EIO;
-	}
-
-	return 0;
-}
-
-static int normal_power_on(struct generic_pm_domain *domain)
-{
-	struct zx_pm_domain *zpd = (struct zx_pm_domain *)domain;
-	unsigned long loop = 10000;
-	u32 tmp;
-
-	tmp = readl_relaxed(pcubase + PCU_DM_PWRDN);
-	tmp &= ~BIT(zpd->bit);
-	writel_relaxed(tmp, pcubase + PCU_DM_PWRDN);
-	do {
-		tmp = readl_relaxed(pcubase + PCU_DM_ACK_SYNC) & BIT(zpd->bit);
-	} while (--loop && tmp);
-
-	if (!loop) {
-		pr_err("Error: %s %s fail\n", __func__, domain->name);
-		return -EIO;
-	}
-
-	tmp = readl_relaxed(pcubase + PCU_DM_RSTEN);
-	tmp &= ~BIT(zpd->bit);
-	writel_relaxed(tmp | BIT(zpd->bit), pcubase + PCU_DM_RSTEN);
-	udelay(5);
-
-	tmp = readl_relaxed(pcubase + PCU_DM_ISOEN);
-	tmp &= ~BIT(zpd->bit);
-	writel_relaxed(tmp, pcubase + PCU_DM_ISOEN);
-	udelay(5);
-
-	tmp = readl_relaxed(pcubase + PCU_DM_CLKEN);
-	tmp &= ~BIT(zpd->bit);
-	writel_relaxed(tmp | BIT(zpd->bit), pcubase + PCU_DM_CLKEN);
-	udelay(5);
-	return 0;
-}
-
-static struct zx_pm_domain gpu_domain = {
-	.dm = {
-		.name		= "gpu_domain",
-		.power_off	= normal_power_off,
-		.power_on	= normal_power_on,
-	},
-	.bit = PCU_DM_GPU,
-};
-
-static struct zx_pm_domain decppu_domain = {
-	.dm = {
-		.name		= "decppu_domain",
-		.power_off	= normal_power_off,
-		.power_on	= normal_power_on,
-	},
-	.bit = PCU_DM_DECPPU,
-};
-
-static struct zx_pm_domain vou_domain = {
-	.dm = {
-		.name		= "vou_domain",
-		.power_off	= normal_power_off,
-		.power_on	= normal_power_on,
-	},
-	.bit = PCU_DM_VOU,
-};
-
-static struct zx_pm_domain r2d_domain = {
-	.dm = {
-		.name		= "r2d_domain",
-		.power_off	= normal_power_off,
-		.power_on	= normal_power_on,
-	},
-	.bit = PCU_DM_R2D,
-};
-
-static struct generic_pm_domain *zx296702_pm_domains[] = {
-	&vou_domain.dm,
-	&gpu_domain.dm,
-	&decppu_domain.dm,
-	&r2d_domain.dm,
-};
-
-static int zx296702_pd_probe(struct platform_device *pdev)
-{
-	struct genpd_onecell_data *genpd_data;
-	struct resource *res;
-	int i;
-
-	genpd_data = devm_kzalloc(&pdev->dev, sizeof(*genpd_data), GFP_KERNEL);
-	if (!genpd_data)
-		return -ENOMEM;
-
-	genpd_data->domains = zx296702_pm_domains;
-	genpd_data->num_domains = ARRAY_SIZE(zx296702_pm_domains);
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "no memory resource defined\n");
-		return -ENODEV;
-	}
-
-	pcubase = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(pcubase)) {
-		dev_err(&pdev->dev, "ioremap fail.\n");
-		return -EIO;
-	}
-
-	for (i = 0; i < ARRAY_SIZE(zx296702_pm_domains); ++i)
-		pm_genpd_init(zx296702_pm_domains[i], NULL, false);
-
-	of_genpd_add_provider_onecell(pdev->dev.of_node, genpd_data);
-	return 0;
-}
-
-static const struct of_device_id zx296702_pm_domain_matches[] __initconst = {
-	{ .compatible = "zte,zx296702-pcu", },
-	{ },
-};
-
-static struct platform_driver zx296702_pd_driver __initdata = {
-	.driver = {
-		.name = "zx-powerdomain",
-		.owner = THIS_MODULE,
-		.of_match_table = zx296702_pm_domain_matches,
-	},
-	.probe = zx296702_pd_probe,
-};
-
-static int __init zx296702_pd_init(void)
-{
-	return platform_driver_register(&zx296702_pd_driver);
-}
-subsys_initcall(zx296702_pd_init);
diff --git a/arch/arm/mach-zx/zx296702.c b/arch/arm/mach-zx/zx296702.c
deleted file mode 100644
index fd8fa3a074fa..000000000000
--- a/arch/arm/mach-zx/zx296702.c
+++ /dev/null
@@ -1,22 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright 2014 Linaro Ltd.
- * Copyright (C) 2014 ZTE Corporation.
- */
-
-#include <asm/mach/arch.h>
-#include <asm/mach/map.h>
-
-#include <linux/of_address.h>
-#include <linux/of_platform.h>
-
-static const char *const zx296702_dt_compat[] __initconst = {
-	"zte,zx296702",
-	NULL,
-};
-
-DT_MACHINE_START(ZX, "ZTE ZX296702 (Device Tree)")
-	.dt_compat	= zx296702_dt_compat,
-	.l2c_aux_val    = 0,
-	.l2c_aux_mask   = ~0,
-MACHINE_END