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>

1 files changed, 0 insertions, 186 deletions

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);