cns3xxx: drop target

This target has not been updated to 5.4 yet, and the only person
trying it (Koen) decided to retreat based on the following reasons:

- The target is not DT-aware at all

- The huge amount of effort required

- The SoC itself reached EoL at Cavium for some time now

- Upstream removed some important parts as it's also slowly getting EoL
  over there

- The commercial product that used this will fade out shortly

- The amount of download for this binary suggest that the target is not
  that popular

Since nobody has picked up the work since then, and this is the last
remaining 4.19-only target, finally drop it now.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

1 files changed, 0 insertions, 327 deletions

diff --git a/target/linux/cns3xxx/files/arch/arm/mach-cns3xxx/platsmp.c b/target/linux/cns3xxx/files/arch/arm/mach-cns3xxx/platsmp.c
deleted file mode 100644
index cb81d1e752..0000000000
--- a/target/linux/cns3xxx/files/arch/arm/mach-cns3xxx/platsmp.c
+++ /dev/null
@@ -1,327 +0,0 @@
-/*
- *  linux/arch/arm/mach-cns3xxx/platsmp.c
- *
- *  Copyright (C) 2002 ARM Ltd.
- *  Copyright 2012 Gateworks Corporation
- *		   Chris Lang <clang@gateworks.com>
- *         Tim Harvey <tharvey@gateworks.com>
- *
- *  All Rights Reserved
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-#include <linux/init.h>
-#include <linux/errno.h>
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/jiffies.h>
-#include <linux/smp.h>
-#include <linux/io.h>
-
-#include <asm/cacheflush.h>
-#include <asm/smp_scu.h>
-#include <asm/unified.h>
-#include <asm/fiq.h>
-#include <mach/smp.h>
-#include "cns3xxx.h"
-
-static struct fiq_handler fh = {
-	.name = "cns3xxx-fiq"
-};
-
-struct fiq_req {
-	union {
-		struct {
-			const void *addr;
-			size_t size;
-		} map;
-		struct {
-			const void *addr;
-			size_t size;
-		} unmap;
-		struct {
-			const void *start;
-			const void *end;
-		} flush;
-	};
-	volatile uint flags;
-	void __iomem *reg;
-} ____cacheline_aligned;
-
-extern unsigned int fiq_number[2];
-
-DEFINE_PER_CPU(struct fiq_req, fiq_data);
-
-#define FIQ_ENABLED         0x80000000
-#define FIQ_GENERATE        0x00010000
-#define CNS3XXX_MAP_AREA    0x01000000
-#define CNS3XXX_UNMAP_AREA  0x02000000
-#define CNS3XXX_FLUSH_RANGE 0x03000000
-
-extern void cns3xxx_secondary_startup(void);
-extern unsigned char cns3xxx_fiq_start, cns3xxx_fiq_end;
-
-#define SCU_CPU_STATUS 0x08
-static void __iomem *scu_base;
-
-static inline void cns3xxx_set_fiq_regs(unsigned int cpu)
-{
-	struct pt_regs FIQ_regs;
-	struct fiq_req *fiq_req = &per_cpu(fiq_data, !cpu);
-
-	FIQ_regs.ARM_r8 = 0;
-	FIQ_regs.ARM_ip = (unsigned int)fiq_req;
-	FIQ_regs.ARM_sp = (int) MISC_FIQ_CPU(!cpu);
-	fiq_req->reg = MISC_FIQ_CPU(!cpu);
-
-	set_fiq_regs(&FIQ_regs);
-}
-
-static void __init cns3xxx_init_fiq(void)
-{
-	void *fiqhandler_start;
-	unsigned int fiqhandler_length;
-	int ret;
-
-	fiqhandler_start = &cns3xxx_fiq_start;
-	fiqhandler_length = &cns3xxx_fiq_end - &cns3xxx_fiq_start;
-
-	ret = claim_fiq(&fh);
-	if (ret)
-		return;
-
-	set_fiq_handler(fiqhandler_start, fiqhandler_length);
-}
-
-
-/*
- * Write pen_release in a way that is guaranteed to be visible to all
- * observers, irrespective of whether they're taking part in coherency
- * or not.  This is necessary for the hotplug code to work reliably.
- */
-static void write_pen_release(int val)
-{
-	pen_release = val;
-	smp_wmb();
-	__cpuc_flush_dcache_area((void *)&pen_release, sizeof(pen_release));
-	outer_clean_range(__pa(&pen_release), __pa(&pen_release + 1));
-}
-
-static DEFINE_SPINLOCK(boot_lock);
-
-static void cns3xxx_secondary_init(unsigned int cpu)
-{
-	/*
-	 * Setup Secondary Core FIQ regs
-	 */
-	cns3xxx_set_fiq_regs(1);
-
-	/*
-	 * let the primary processor know we're out of the
-	 * pen, then head off into the C entry point
-	 */
-	write_pen_release(-1);
-
-	/*
-	 * Synchronise with the boot thread.
-	 */
-	spin_lock(&boot_lock);
-	spin_unlock(&boot_lock);
-}
-
-static int cns3xxx_boot_secondary(unsigned int cpu, struct task_struct *idle)
-{
-	unsigned long timeout;
-
-	/*
-	 * Set synchronisation state between this boot processor
-	 * and the secondary one
-	 */
-	spin_lock(&boot_lock);
-
-	/*
-	 * The secondary processor is waiting to be released from
-	 * the holding pen - release it, then wait for it to flag
-	 * that it has been released by resetting pen_release.
-	 *
-	 * Note that "pen_release" is the hardware CPU ID, whereas
-	 * "cpu" is Linux's internal ID.
-	 */
-	write_pen_release(cpu);
-
-	/*
-	 * Send the secondary CPU a soft interrupt, thereby causing
-	 * the boot monitor to read the system wide flags register,
-	 * and branch to the address found there.
-	 */
-	arch_send_wakeup_ipi_mask(cpumask_of(cpu));;
-
-	timeout = jiffies + (1 * HZ);
-	while (time_before(jiffies, timeout)) {
-		smp_rmb();
-		if (pen_release == -1)
-			break;
-
-		udelay(10);
-	}
-
-	/*
-	 * now the secondary core is starting up let it run its
-	 * calibrations, then wait for it to finish
-	 */
-	spin_unlock(&boot_lock);
-
-	return pen_release != -1 ? -ENOSYS : 0;
-}
-
-/*
- * Initialise the CPU possible map early - this describes the CPUs
- * which may be present or become present in the system.
- */
-static void __init cns3xxx_smp_init_cpus(void)
-{
-	unsigned int i, ncores;
-	unsigned int status;
-
-	scu_base = (void __iomem *) CNS3XXX_TC11MP_SCU_BASE_VIRT;
-
-	/* for CNS3xxx SCU_CPU_STATUS must be examined instead of SCU_CONFIGURATION
-	 * used in scu_get_core_count
-	 */
-	status = __raw_readl(scu_base + SCU_CPU_STATUS);
-	for (i = 0; i < NR_CPUS+1; i++) {
-		if (((status >> (i*2)) & 0x3) == 0)
-			set_cpu_possible(i, true);
-		else
-			break;
-	}
-	ncores = i;
-}
-
-static void __init cns3xxx_smp_prepare_cpus(unsigned int max_cpus)
-{
-	/*
-	 * enable SCU
-	 */
-	scu_enable(scu_base);
-
-	/*
-	 * Write the address of secondary startup into the
-	 * system-wide flags register. The boot monitor waits
-	 * until it receives a soft interrupt, and then the
-	 * secondary CPU branches to this address.
-	 */
-	__raw_writel(virt_to_phys(cns3xxx_secondary_startup),
-			(void __iomem *)(CNS3XXX_MISC_BASE_VIRT + 0x0600));
-
-	/*
-	 * Setup FIQ's for main cpu
-	 */
-	cns3xxx_init_fiq();
-	cns3xxx_set_fiq_regs(0);
-}
-
-extern void v6_dma_map_area(const void *, size_t, int);
-extern void v6_dma_unmap_area(const void *, size_t, int);
-extern void v6_dma_flush_range(const void *, const void *);
-extern void v6_flush_kern_dcache_area(void *, size_t);
-
-void fiq_dma_map_area(const void *addr, size_t size, int dir)
-{
-	unsigned long flags;
-	struct fiq_req *req;
-
-	raw_local_irq_save(flags);
-	/* currently, not possible to take cpu0 down, so only check cpu1 */
-	if (!cpu_online(1)) {
-		raw_local_irq_restore(flags);
-		v6_dma_map_area(addr, size, dir);
-		return;
-	}
-
-	req = this_cpu_ptr(&fiq_data);
-	req->map.addr = addr;
-	req->map.size = size;
-	req->flags = dir | CNS3XXX_MAP_AREA;
-	smp_mb();
-
-	writel_relaxed(FIQ_GENERATE, req->reg);
-
-	v6_dma_map_area(addr, size, dir);
-	while (req->flags)
-		barrier();
-
-	raw_local_irq_restore(flags);
-}
-
-void fiq_dma_unmap_area(const void *addr, size_t size, int dir)
-{
-	unsigned long flags;
-	struct fiq_req *req;
-
-	raw_local_irq_save(flags);
-	/* currently, not possible to take cpu0 down, so only check cpu1 */
-	if (!cpu_online(1)) {
-		raw_local_irq_restore(flags);
-		v6_dma_unmap_area(addr, size, dir);
-		return;
-	}
-
-	req = this_cpu_ptr(&fiq_data);
-	req->unmap.addr = addr;
-	req->unmap.size = size;
-	req->flags = dir | CNS3XXX_UNMAP_AREA;
-	smp_mb();
-
-	writel_relaxed(FIQ_GENERATE, req->reg);
-
-	v6_dma_unmap_area(addr, size, dir);
-	while (req->flags)
-		barrier();
-
-	raw_local_irq_restore(flags);
-}
-
-void fiq_dma_flush_range(const void *start, const void *end)
-{
-	unsigned long flags;
-	struct fiq_req *req;
-
-	raw_local_irq_save(flags);
-	/* currently, not possible to take cpu0 down, so only check cpu1 */
-	if (!cpu_online(1)) {
-		raw_local_irq_restore(flags);
-		v6_dma_flush_range(start, end);
-		return;
-	}
-
-	req = this_cpu_ptr(&fiq_data);
-
-	req->flush.start = start;
-	req->flush.end = end;
-	req->flags = CNS3XXX_FLUSH_RANGE;
-	smp_mb();
-
-	writel_relaxed(FIQ_GENERATE, req->reg);
-
-	v6_dma_flush_range(start, end);
-
-	while (req->flags)
-		barrier();
-
-	raw_local_irq_restore(flags);
-}
-
-void fiq_flush_kern_dcache_area(void *addr, size_t size)
-{
-	fiq_dma_flush_range(addr, addr + size);
-}
-
-struct smp_operations cns3xxx_smp_ops __initdata = {
-	.smp_init_cpus      = cns3xxx_smp_init_cpus,
-	.smp_prepare_cpus   = cns3xxx_smp_prepare_cpus,
-	.smp_secondary_init = cns3xxx_secondary_init,
-	.smp_boot_secondary = cns3xxx_boot_secondary,
-};