metag: Remove arch/metag/

The earliest Meta architecture port of Linux I have a record of was an
import of a Meta port of Linux v2.4.1 in February 2004, which was worked
on significantly over the next few years by Graham Whaley, Will Newton,
Matt Fleming, myself and others.

Eventually the port was merged into mainline in v3.9 in March 2013, not
long after Imagination Technologies bought MIPS Technologies and shifted
its CPU focus over to the MIPS architecture.

As a result, though the port was maintained for a while, kept on life
support for a while longer, and useful for testing a few specific
drivers for which I don't have ready access to the equivalent MIPS
hardware, it is now essentially dead with no users.

It is also stuck using an out-of-tree toolchain based on GCC 4.2.4 which
is no longer maintained, now struggles to build modern kernels due to
toolchain bugs, and doesn't itself build with a modern GCC. The latest
buildroot port is still using an old uClibc snapshot which is no longer
served, and the latest uClibc doesn't build with GCC 4.2.4.

So lets call it a day and drop the Meta architecture port from the
kernel. RIP Meta.

Signed-off-by: James Hogan <jhogan@kernel.org>
Link: https://lkml.kernel.org/r/95906b76-6ce1-3f84-eaba-c29b4ae952eb@roeck-us.net
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Graham Whaley <graham.whaley@gmail.com>
Cc: linux-metag@vger.kernel.org

1 files changed, 0 insertions, 622 deletions

diff --git a/arch/metag/kernel/setup.c b/arch/metag/kernel/setup.c
deleted file mode 100644
index 1166f1f..0000000
--- a/arch/metag/kernel/setup.c
+++ /dev/null
@@ -1,622 +0,0 @@
-/*
- * Copyright (C) 2005-2012 Imagination Technologies Ltd.
- *
- * This file contains the architecture-dependant parts of system setup.
- *
- */
-
-#include <linux/export.h>
-#include <linux/bootmem.h>
-#include <linux/console.h>
-#include <linux/cpu.h>
-#include <linux/delay.h>
-#include <linux/errno.h>
-#include <linux/fs.h>
-#include <linux/genhd.h>
-#include <linux/init.h>
-#include <linux/initrd.h>
-#include <linux/interrupt.h>
-#include <linux/kernel.h>
-#include <linux/memblock.h>
-#include <linux/mm.h>
-#include <linux/of_fdt.h>
-#include <linux/pfn.h>
-#include <linux/root_dev.h>
-#include <linux/sched.h>
-#include <linux/seq_file.h>
-#include <linux/start_kernel.h>
-#include <linux/string.h>
-
-#include <asm/cachepart.h>
-#include <asm/clock.h>
-#include <asm/core_reg.h>
-#include <asm/cpu.h>
-#include <asm/da.h>
-#include <asm/highmem.h>
-#include <asm/hwthread.h>
-#include <asm/l2cache.h>
-#include <asm/mach/arch.h>
-#include <asm/metag_mem.h>
-#include <asm/metag_regs.h>
-#include <asm/mmu.h>
-#include <asm/mmzone.h>
-#include <asm/processor.h>
-#include <asm/sections.h>
-#include <asm/setup.h>
-#include <asm/traps.h>
-
-/* Priv protect as many registers as possible. */
-#define DEFAULT_PRIV	(TXPRIVEXT_COPRO_BITS		| \
-			 TXPRIVEXT_TXTRIGGER_BIT	| \
-			 TXPRIVEXT_TXGBLCREG_BIT	| \
-			 TXPRIVEXT_ILOCK_BIT		| \
-			 TXPRIVEXT_TXITACCYC_BIT	| \
-			 TXPRIVEXT_TXDIVTIME_BIT	| \
-			 TXPRIVEXT_TXAMAREGX_BIT	| \
-			 TXPRIVEXT_TXTIMERI_BIT		| \
-			 TXPRIVEXT_TXSTATUS_BIT		| \
-			 TXPRIVEXT_TXDISABLE_BIT)
-
-/* Meta2 specific bits. */
-#ifdef CONFIG_METAG_META12
-#define META2_PRIV	0
-#else
-#define META2_PRIV	(TXPRIVEXT_TXTIMER_BIT		| \
-			 TXPRIVEXT_TRACE_BIT)
-#endif
-
-/* Unaligned access checking bits. */
-#ifdef CONFIG_METAG_UNALIGNED
-#define UNALIGNED_PRIV	TXPRIVEXT_ALIGNREW_BIT
-#else
-#define UNALIGNED_PRIV	0
-#endif
-
-#define PRIV_BITS 	(DEFAULT_PRIV			| \
-			 META2_PRIV			| \
-			 UNALIGNED_PRIV)
-
-/*
- * Protect access to:
- * 0x06000000-0x07ffffff Direct mapped region
- * 0x05000000-0x05ffffff MMU table region (Meta1)
- * 0x04400000-0x047fffff Cache flush region
- * 0x84000000-0x87ffffff Core cache memory region (Meta2)
- *
- * Allow access to:
- * 0x80000000-0x81ffffff Core code memory region (Meta2)
- */
-#ifdef CONFIG_METAG_META12
-#define PRIVSYSR_BITS	TXPRIVSYSR_ALL_BITS
-#else
-#define PRIVSYSR_BITS	(TXPRIVSYSR_ALL_BITS & ~TXPRIVSYSR_CORECODE_BIT)
-#endif
-
-/* Protect all 0x02xxxxxx and 0x048xxxxx. */
-#define PIOREG_BITS	0xffffffff
-
-/*
- * Protect all 0x04000xx0 (system events)
- * except write combiner flush and write fence (system events 4 and 5).
- */
-#define PSYREG_BITS	0xfffffffb
-
-
-extern char _heap_start[];
-
-#ifdef CONFIG_DA_CONSOLE
-/* Our early channel based console driver */
-extern struct console dash_console;
-#endif
-
-const struct machine_desc *machine_desc __initdata;
-
-/*
- * Map a Linux CPU number to a hardware thread ID
- * In SMP this will be setup with the correct mapping at startup; in UP this
- * will map to the HW thread on which we are running.
- */
-u8 cpu_2_hwthread_id[NR_CPUS] __read_mostly = {
-	[0 ... NR_CPUS-1] = BAD_HWTHREAD_ID
-};
-EXPORT_SYMBOL_GPL(cpu_2_hwthread_id);
-
-/*
- * Map a hardware thread ID to a Linux CPU number
- * In SMP this will be fleshed out with the correct CPU ID for a particular
- * hardware thread. In UP this will be initialised with the boot CPU ID.
- */
-u8 hwthread_id_2_cpu[4] __read_mostly = {
-	[0 ... 3] = BAD_CPU_ID
-};
-
-/* The relative offset of the MMU mapped memory (from ldlk or bootloader)
- * to the real physical memory.  This is needed as we have to use the
- * physical addresses in the MMU tables (pte entries), and not the virtual
- * addresses.
- * This variable is used in the __pa() and __va() macros, and should
- * probably only be used via them.
- */
-unsigned int meta_memoffset;
-EXPORT_SYMBOL(meta_memoffset);
-
-static char __initdata *original_cmd_line;
-
-DEFINE_PER_CPU(PTBI, pTBI);
-
-/*
- * Mapping are specified as "CPU_ID:HWTHREAD_ID", e.g.
- *
- *	"hwthread_map=0:1,1:2,2:3,3:0"
- *
- *	Linux CPU ID	HWTHREAD_ID
- *	---------------------------
- *	    0		      1
- *	    1		      2
- *	    2		      3
- *	    3		      0
- */
-static int __init parse_hwthread_map(char *p)
-{
-	int cpu;
-
-	while (*p) {
-		cpu = (*p++) - '0';
-		if (cpu < 0 || cpu > 9)
-			goto err_cpu;
-
-		p++;		/* skip semi-colon */
-		cpu_2_hwthread_id[cpu] = (*p++) - '0';
-		if (cpu_2_hwthread_id[cpu] >= 4)
-			goto err_thread;
-		hwthread_id_2_cpu[cpu_2_hwthread_id[cpu]] = cpu;
-
-		if (*p == ',')
-			p++;		/* skip comma */
-	}
-
-	return 0;
-err_cpu:
-	pr_err("%s: hwthread_map cpu argument out of range\n", __func__);
-	return -EINVAL;
-err_thread:
-	pr_err("%s: hwthread_map thread argument out of range\n", __func__);
-	return -EINVAL;
-}
-early_param("hwthread_map", parse_hwthread_map);
-
-void __init dump_machine_table(void)
-{
-	struct machine_desc *p;
-	const char **compat;
-
-	pr_info("Available machine support:\n\tNAME\t\tCOMPATIBLE LIST\n");
-	for_each_machine_desc(p) {
-		pr_info("\t%s\t[", p->name);
-		for (compat = p->dt_compat; compat && *compat; ++compat)
-			printk(" '%s'", *compat);
-		printk(" ]\n");
-	}
-
-	pr_info("\nPlease check your kernel config and/or bootloader.\n");
-
-	hard_processor_halt(HALT_PANIC);
-}
-
-#ifdef CONFIG_METAG_HALT_ON_PANIC
-static int metag_panic_event(struct notifier_block *this, unsigned long event,
-			     void *ptr)
-{
-	hard_processor_halt(HALT_PANIC);
-	return NOTIFY_DONE;
-}
-
-static struct notifier_block metag_panic_block = {
-	metag_panic_event,
-	NULL,
-	0
-};
-#endif
-
-void __init setup_arch(char **cmdline_p)
-{
-	unsigned long start_pfn;
-	unsigned long text_start = (unsigned long)(&_stext);
-	unsigned long cpu = smp_processor_id();
-	unsigned long heap_start, heap_end;
-	unsigned long start_pte;
-	PTBI _pTBI;
-	PTBISEG p_heap;
-	int heap_id, i;
-
-	metag_cache_probe();
-
-	metag_da_probe();
-#ifdef CONFIG_DA_CONSOLE
-	if (metag_da_enabled()) {
-		/* An early channel based console driver */
-		register_console(&dash_console);
-		add_preferred_console("ttyDA", 1, NULL);
-	}
-#endif
-
-	/* try interpreting the argument as a device tree */
-	machine_desc = setup_machine_fdt(original_cmd_line);
-	/* if it doesn't look like a device tree it must be a command line */
-	if (!machine_desc) {
-#ifdef CONFIG_METAG_BUILTIN_DTB
-		/* try the embedded device tree */
-		machine_desc = setup_machine_fdt(__dtb_start);
-		if (!machine_desc)
-			panic("Invalid embedded device tree.");
-#else
-		/* use the default machine description */
-		machine_desc = default_machine_desc();
-#endif
-#ifndef CONFIG_CMDLINE_FORCE
-		/* append the bootloader cmdline to any builtin fdt cmdline */
-		if (boot_command_line[0] && original_cmd_line[0])
-			strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
-		strlcat(boot_command_line, original_cmd_line,
-			COMMAND_LINE_SIZE);
-#endif
-	}
-	setup_meta_clocks(machine_desc->clocks);
-
-	*cmdline_p = boot_command_line;
-	parse_early_param();
-
-	/*
-	 * Make sure we don't alias in dcache or icache
-	 */
-	check_for_cache_aliasing(cpu);
-
-
-#ifdef CONFIG_METAG_HALT_ON_PANIC
-	atomic_notifier_chain_register(&panic_notifier_list,
-				       &metag_panic_block);
-#endif
-
-#ifdef CONFIG_DUMMY_CONSOLE
-	conswitchp = &dummy_con;
-#endif
-
-	if (!(__core_reg_get(TXSTATUS) & TXSTATUS_PSTAT_BIT))
-		panic("Privilege must be enabled for this thread.");
-
-	_pTBI = __TBI(TBID_ISTAT_BIT);
-
-	per_cpu(pTBI, cpu) = _pTBI;
-
-	if (!per_cpu(pTBI, cpu))
-		panic("No TBI found!");
-
-	/*
-	 * Initialize all interrupt vectors to our copy of __TBIUnExpXXX,
-	 * rather than the version from the bootloader. This makes call
-	 * stacks easier to understand and may allow us to unmap the
-	 * bootloader at some point.
-	 */
-	for (i = 0; i <= TBID_SIGNUM_MAX; i++)
-		_pTBI->fnSigs[i] = __TBIUnExpXXX;
-
-	/* A Meta requirement is that the kernel is loaded (virtually)
-	 * at the PAGE_OFFSET.
-	 */
-	if (PAGE_OFFSET != text_start)
-		panic("Kernel not loaded at PAGE_OFFSET (%#x) but at %#lx.",
-		      PAGE_OFFSET, text_start);
-
-	start_pte = mmu_read_second_level_page(text_start);
-
-	/*
-	 * Kernel pages should have the PRIV bit set by the bootloader.
-	 */
-	if (!(start_pte & _PAGE_KERNEL))
-		panic("kernel pte does not have PRIV set");
-
-	/*
-	 * See __pa and __va in include/asm/page.h.
-	 * This value is negative when running in local space but the
-	 * calculations work anyway.
-	 */
-	meta_memoffset = text_start - (start_pte & PAGE_MASK);
-
-	/* Now lets look at the heap space */
-	heap_id = (__TBIThreadId() & TBID_THREAD_BITS)
-		+ TBID_SEG(0, TBID_SEGSCOPE_LOCAL, TBID_SEGTYPE_HEAP);
-
-	p_heap = __TBIFindSeg(NULL, heap_id);
-
-	if (!p_heap)
-		panic("Could not find heap from TBI!");
-
-	/* The heap begins at the first full page after the kernel data. */
-	heap_start = (unsigned long) &_heap_start;
-
-	/* The heap ends at the end of the heap segment specified with
-	 * ldlk.
-	 */
-	if (is_global_space(text_start)) {
-		pr_debug("WARNING: running in global space!\n");
-		heap_end = (unsigned long)p_heap->pGAddr + p_heap->Bytes;
-	} else {
-		heap_end = (unsigned long)p_heap->pLAddr + p_heap->Bytes;
-	}
-
-	ROOT_DEV = Root_RAM0;
-
-	/* init_mm is the mm struct used for the first task.  It is then
-	 * cloned for all other tasks spawned from that task.
-	 *
-	 * Note - we are using the virtual addresses here.
-	 */
-	init_mm.start_code = (unsigned long)(&_stext);
-	init_mm.end_code = (unsigned long)(&_etext);
-	init_mm.end_data = (unsigned long)(&_edata);
-	init_mm.brk = (unsigned long)heap_start;
-
-	min_low_pfn = PFN_UP(__pa(text_start));
-	max_low_pfn = PFN_DOWN(__pa(heap_end));
-
-	pfn_base = min_low_pfn;
-
-	/* Round max_pfn up to a 4Mb boundary. The free_bootmem_node()
-	 * call later makes sure to keep the rounded up pages marked reserved.
-	 */
-	max_pfn = max_low_pfn + ((1 << MAX_ORDER) - 1);
-	max_pfn &= ~((1 << MAX_ORDER) - 1);
-
-	start_pfn = PFN_UP(__pa(heap_start));
-
-	if (min_low_pfn & ((1 << MAX_ORDER) - 1)) {
-		/* Theoretically, we could expand the space that the
-		 * bootmem allocator covers - much as we do for the
-		 * 'high' address, and then tell the bootmem system
-		 * that the lowest chunk is 'not available'.  Right
-		 * now it is just much easier to constrain the
-		 * user to always MAX_ORDER align their kernel space.
-		 */
-
-		panic("Kernel must be %d byte aligned, currently at %#lx.",
-		      1 << (MAX_ORDER + PAGE_SHIFT),
-		      min_low_pfn << PAGE_SHIFT);
-	}
-
-#ifdef CONFIG_HIGHMEM
-	highstart_pfn = highend_pfn = max_pfn;
-	high_memory = (void *) __va(PFN_PHYS(highstart_pfn));
-#else
-	high_memory = (void *)__va(PFN_PHYS(max_pfn));
-#endif
-
-	paging_init(heap_end);
-
-	setup_priv();
-
-	/* Setup the boot cpu's mapping. The rest will be setup below. */
-	cpu_2_hwthread_id[smp_processor_id()] = hard_processor_id();
-	hwthread_id_2_cpu[hard_processor_id()] = smp_processor_id();
-
-	unflatten_and_copy_device_tree();
-
-#ifdef CONFIG_SMP
-	smp_init_cpus();
-#endif
-
-	if (machine_desc->init_early)
-		machine_desc->init_early();
-}
-
-static int __init customize_machine(void)
-{
-	/* customizes platform devices, or adds new ones */
-	if (machine_desc->init_machine)
-		machine_desc->init_machine();
-
-	return 0;
-}
-arch_initcall(customize_machine);
-
-static int __init init_machine_late(void)
-{
-	if (machine_desc->init_late)
-		machine_desc->init_late();
-	return 0;
-}
-late_initcall(init_machine_late);
-
-#ifdef CONFIG_PROC_FS
-/*
- *	Get CPU information for use by the procfs.
- */
-static const char *get_cpu_capabilities(unsigned int txenable)
-{
-#ifdef CONFIG_METAG_META21
-	/* See CORE_ID in META HTP.GP TRM - Architecture Overview 2.1.238 */
-	int coreid = metag_in32(METAC_CORE_ID);
-	unsigned int dsp_type = (coreid >> 3) & 7;
-	unsigned int fpu_type = (coreid >> 7) & 3;
-
-	switch (dsp_type | fpu_type << 3) {
-	case (0x00): return "EDSP";
-	case (0x01): return "DSP";
-	case (0x08): return "EDSP+LFPU";
-	case (0x09): return "DSP+LFPU";
-	case (0x10): return "EDSP+FPU";
-	case (0x11): return "DSP+FPU";
-	}
-	return "UNKNOWN";
-
-#else
-	if (!(txenable & TXENABLE_CLASS_BITS))
-		return "DSP";
-	else
-		return "";
-#endif
-}
-
-static int show_cpuinfo(struct seq_file *m, void *v)
-{
-	const char *cpu;
-	unsigned int txenable, thread_id, major, minor;
-	unsigned long clockfreq = get_coreclock();
-#ifdef CONFIG_SMP
-	int i;
-	unsigned long lpj;
-#endif
-
-	cpu = "META";
-
-	txenable = __core_reg_get(TXENABLE);
-	major = (txenable & TXENABLE_MAJOR_REV_BITS) >> TXENABLE_MAJOR_REV_S;
-	minor = (txenable & TXENABLE_MINOR_REV_BITS) >> TXENABLE_MINOR_REV_S;
-	thread_id = (txenable >> 8) & 0x3;
-
-#ifdef CONFIG_SMP
-	for_each_online_cpu(i) {
-		lpj = per_cpu(cpu_data, i).loops_per_jiffy;
-		txenable = core_reg_read(TXUCT_ID, TXENABLE_REGNUM,
-							cpu_2_hwthread_id[i]);
-
-		seq_printf(m, "CPU:\t\t%s %d.%d (thread %d)\n"
-			      "Clocking:\t%lu.%1luMHz\n"
-			      "BogoMips:\t%lu.%02lu\n"
-			      "Calibration:\t%lu loops\n"
-			      "Capabilities:\t%s\n\n",
-			      cpu, major, minor, i,
-			      clockfreq / 1000000, (clockfreq / 100000) % 10,
-			      lpj / (500000 / HZ), (lpj / (5000 / HZ)) % 100,
-			      lpj,
-			      get_cpu_capabilities(txenable));
-	}
-#else
-	seq_printf(m, "CPU:\t\t%s %d.%d (thread %d)\n"
-		   "Clocking:\t%lu.%1luMHz\n"
-		   "BogoMips:\t%lu.%02lu\n"
-		   "Calibration:\t%lu loops\n"
-		   "Capabilities:\t%s\n",
-		   cpu, major, minor, thread_id,
-		   clockfreq / 1000000, (clockfreq / 100000) % 10,
-		   loops_per_jiffy / (500000 / HZ),
-		   (loops_per_jiffy / (5000 / HZ)) % 100,
-		   loops_per_jiffy,
-		   get_cpu_capabilities(txenable));
-#endif /* CONFIG_SMP */
-
-#ifdef CONFIG_METAG_L2C
-	if (meta_l2c_is_present()) {
-		seq_printf(m, "L2 cache:\t%s\n"
-			      "L2 cache size:\t%d KB\n",
-			      meta_l2c_is_enabled() ? "enabled" : "disabled",
-			      meta_l2c_size() >> 10);
-	}
-#endif
-	return 0;
-}
-
-static void *c_start(struct seq_file *m, loff_t *pos)
-{
-	return (void *)(*pos == 0);
-}
-static void *c_next(struct seq_file *m, void *v, loff_t *pos)
-{
-	return NULL;
-}
-static void c_stop(struct seq_file *m, void *v)
-{
-}
-const struct seq_operations cpuinfo_op = {
-	.start = c_start,
-	.next  = c_next,
-	.stop  = c_stop,
-	.show  = show_cpuinfo,
-};
-#endif /* CONFIG_PROC_FS */
-
-void __init metag_start_kernel(char *args)
-{
-	/* Zero the timer register so timestamps are from the point at
-	 * which the kernel started running.
-	 */
-	__core_reg_set(TXTIMER, 0);
-
-	/* Clear the bss. */
-	memset(__bss_start, 0,
-	       (unsigned long)__bss_stop - (unsigned long)__bss_start);
-
-	/* Remember where these are for use in setup_arch */
-	original_cmd_line = args;
-
-	current_thread_info()->cpu = hard_processor_id();
-
-	start_kernel();
-}
-
-/**
- * setup_priv() - Set up privilege protection registers.
- *
- * Set up privilege protection registers such as TXPRIVEXT to prevent userland
- * from touching our precious registers and sensitive memory areas.
- */
-void setup_priv(void)
-{
-	unsigned int offset = hard_processor_id() << TXPRIVREG_STRIDE_S;
-
-	__core_reg_set(TXPRIVEXT, PRIV_BITS);
-
-	metag_out32(PRIVSYSR_BITS, T0PRIVSYSR + offset);
-	metag_out32(PIOREG_BITS,   T0PIOREG   + offset);
-	metag_out32(PSYREG_BITS,   T0PSYREG   + offset);
-}
-
-PTBI pTBI_get(unsigned int cpu)
-{
-	return per_cpu(pTBI, cpu);
-}
-EXPORT_SYMBOL(pTBI_get);
-
-#if defined(CONFIG_METAG_DSP) && defined(CONFIG_METAG_FPU)
-static char capabilities[] = "dsp fpu";
-#elif defined(CONFIG_METAG_DSP)
-static char capabilities[] = "dsp";
-#elif defined(CONFIG_METAG_FPU)
-static char capabilities[] = "fpu";
-#else
-static char capabilities[] = "";
-#endif
-
-static struct ctl_table caps_kern_table[] = {
-	{
-		.procname	= "capabilities",
-		.data		= capabilities,
-		.maxlen		= sizeof(capabilities),
-		.mode		= 0444,
-		.proc_handler	= proc_dostring,
-	},
-	{}
-};
-
-static struct ctl_table caps_root_table[] = {
-	{
-		.procname	= "kernel",
-		.mode		= 0555,
-		.child		= caps_kern_table,
-	},
-	{}
-};
-
-static int __init capabilities_register_sysctl(void)
-{
-	struct ctl_table_header *caps_table_header;
-
-	caps_table_header = register_sysctl_table(caps_root_table);
-	if (!caps_table_header) {
-		pr_err("Unable to register CAPABILITIES sysctl\n");
-		return -ENOMEM;
-	}
-
-	return 0;
-}
-
-core_initcall(capabilities_register_sysctl);