[mirror_ubuntu-zesty-kernel.git] / arch / arc / kernel / setup.c

/*
 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
 *
 * 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/seq_file.h>
#include <linux/fs.h>
#include <linux/delay.h>
#include <linux/root_dev.h>
#include <linux/console.h>
#include <linux/module.h>
#include <linux/cpu.h>
#include <linux/clk-provider.h>
#include <linux/of_fdt.h>
#include <linux/of_platform.h>
#include <linux/cache.h>
#include <asm/sections.h>
#include <asm/arcregs.h>
#include <asm/tlb.h>
#include <asm/setup.h>
#include <asm/page.h>
#include <asm/irq.h>
#include <asm/unwind.h>
#include <asm/clk.h>
#include <asm/mach_desc.h>
#include <asm/smp.h>

#define FIX_PTR(x)  __asm__ __volatile__(";" : "+r"(x))

unsigned int intr_to_DE_cnt;

/* Part of U-boot ABI: see head.S */
int __initdata uboot_tag;
char __initdata *uboot_arg;

const struct machine_desc *machine_desc;

struct task_struct *_current_task[NR_CPUS];	/* For stack switching */

struct cpuinfo_arc cpuinfo_arc700[NR_CPUS];

static void read_arc_build_cfg_regs(void)
{
	struct bcr_perip uncached_space;
	struct bcr_generic bcr;
	struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
	unsigned long perip_space;
	FIX_PTR(cpu);

	READ_BCR(AUX_IDENTITY, cpu->core);
	READ_BCR(ARC_REG_ISA_CFG_BCR, cpu->isa);

	READ_BCR(ARC_REG_TIMERS_BCR, cpu->timers);
	cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE);

	READ_BCR(ARC_REG_D_UNCACH_BCR, uncached_space);
        if (uncached_space.ver < 3)
		perip_space = uncached_space.start << 24;
	else
		perip_space = read_aux_reg(AUX_NON_VOL) & 0xF0000000;

	BUG_ON(perip_space != ARC_UNCACHED_ADDR_SPACE);

	READ_BCR(ARC_REG_MUL_BCR, cpu->extn_mpy);

	cpu->extn.norm = read_aux_reg(ARC_REG_NORM_BCR) > 1 ? 1 : 0; /* 2,3 */
	cpu->extn.barrel = read_aux_reg(ARC_REG_BARREL_BCR) > 1 ? 1 : 0; /* 2,3 */
	cpu->extn.swap = read_aux_reg(ARC_REG_SWAP_BCR) ? 1 : 0;        /* 1,3 */
	cpu->extn.crc = read_aux_reg(ARC_REG_CRC_BCR) ? 1 : 0;
	cpu->extn.minmax = read_aux_reg(ARC_REG_MIXMAX_BCR) > 1 ? 1 : 0; /* 2 */

	/* Note that we read the CCM BCRs independent of kernel config
	 * This is to catch the cases where user doesn't know that
	 * CCMs are present in hardware build
	 */
	{
		struct bcr_iccm iccm;
		struct bcr_dccm dccm;
		struct bcr_dccm_base dccm_base;
		unsigned int bcr_32bit_val;

		bcr_32bit_val = read_aux_reg(ARC_REG_ICCM_BCR);
		if (bcr_32bit_val) {
			iccm = *((struct bcr_iccm *)&bcr_32bit_val);
			cpu->iccm.base_addr = iccm.base << 16;
			cpu->iccm.sz = 0x2000 << (iccm.sz - 1);
		}

		bcr_32bit_val = read_aux_reg(ARC_REG_DCCM_BCR);
		if (bcr_32bit_val) {
			dccm = *((struct bcr_dccm *)&bcr_32bit_val);
			cpu->dccm.sz = 0x800 << (dccm.sz);

			READ_BCR(ARC_REG_DCCMBASE_BCR, dccm_base);
			cpu->dccm.base_addr = dccm_base.addr << 8;
		}
	}

	READ_BCR(ARC_REG_XY_MEM_BCR, cpu->extn_xymem);

	read_decode_mmu_bcr();
	read_decode_cache_bcr();

	if (is_isa_arcompact()) {
		struct bcr_fp_arcompact sp, dp;
		struct bcr_bpu_arcompact bpu;

		READ_BCR(ARC_REG_FP_BCR, sp);
		READ_BCR(ARC_REG_DPFP_BCR, dp);
		cpu->extn.fpu_sp = sp.ver ? 1 : 0;
		cpu->extn.fpu_dp = dp.ver ? 1 : 0;

		READ_BCR(ARC_REG_BPU_BCR, bpu);
		cpu->bpu.ver = bpu.ver;
		cpu->bpu.full = bpu.fam ? 1 : 0;
		if (bpu.ent) {
			cpu->bpu.num_cache = 256 << (bpu.ent - 1);
			cpu->bpu.num_pred = 256 << (bpu.ent - 1);
		}
	} else {
		struct bcr_fp_arcv2 spdp;
		struct bcr_bpu_arcv2 bpu;

		READ_BCR(ARC_REG_FP_V2_BCR, spdp);
		cpu->extn.fpu_sp = spdp.sp ? 1 : 0;
		cpu->extn.fpu_dp = spdp.dp ? 1 : 0;

		READ_BCR(ARC_REG_BPU_BCR, bpu);
		cpu->bpu.ver = bpu.ver;
		cpu->bpu.full = bpu.ft;
		cpu->bpu.num_cache = 256 << bpu.bce;
		cpu->bpu.num_pred = 2048 << bpu.pte;
	}

	READ_BCR(ARC_REG_AP_BCR, bcr);
	cpu->extn.ap = bcr.ver ? 1 : 0;

	READ_BCR(ARC_REG_SMART_BCR, bcr);
	cpu->extn.smart = bcr.ver ? 1 : 0;

	READ_BCR(ARC_REG_RTT_BCR, bcr);
	cpu->extn.rtt = bcr.ver ? 1 : 0;

	cpu->extn.debug = cpu->extn.ap | cpu->extn.smart | cpu->extn.rtt;
}

static const struct cpuinfo_data arc_cpu_tbl[] = {
#ifdef CONFIG_ISA_ARCOMPACT
	{ {0x20, "ARC 600"      }, 0x2F},
	{ {0x30, "ARC 700"      }, 0x33},
	{ {0x34, "ARC 700 R4.10"}, 0x34},
	{ {0x35, "ARC 700 R4.11"}, 0x35},
#else
	{ {0x50, "ARC HS38 R2.0"}, 0x51},
	{ {0x52, "ARC HS38 R2.1"}, 0x52},
#endif
	{ {0x00, NULL		} }
};

#define IS_AVAIL1(v, s)		((v) ? s : "")
#define IS_USED_RUN(v)		((v) ? "" : "(not used) ")
#define IS_USED_CFG(cfg)	IS_USED_RUN(IS_ENABLED(cfg))
#define IS_AVAIL2(v, s, cfg)	IS_AVAIL1(v, s), IS_AVAIL1(v, IS_USED_CFG(cfg))

static char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len)
{
	struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
	struct bcr_identity *core = &cpu->core;
	const struct cpuinfo_data *tbl;
	char *isa_nm;
	int i, be, atomic;
	int n = 0;

	FIX_PTR(cpu);

	if (is_isa_arcompact()) {
		isa_nm = "ARCompact";
		be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN);

		atomic = cpu->isa.atomic1;
		if (!cpu->isa.ver)	/* ISA BCR absent, use Kconfig info */
			atomic = IS_ENABLED(CONFIG_ARC_HAS_LLSC);
	} else {
		isa_nm = "ARCv2";
		be = cpu->isa.be;
		atomic = cpu->isa.atomic;
	}

	n += scnprintf(buf + n, len - n,
		       "\nIDENTITY\t: ARCVER [%#02x] ARCNUM [%#02x] CHIPID [%#4x]\n",
		       core->family, core->cpu_id, core->chip_id);

	for (tbl = &arc_cpu_tbl[0]; tbl->info.id != 0; tbl++) {
		if ((core->family >= tbl->info.id) &&
		    (core->family <= tbl->up_range)) {
			n += scnprintf(buf + n, len - n,
				       "processor [%d]\t: %s (%s ISA) %s\n",
				       cpu_id, tbl->info.str, isa_nm,
				       IS_AVAIL1(be, "[Big-Endian]"));
			break;
		}
	}

	if (tbl->info.id == 0)
		n += scnprintf(buf + n, len - n, "UNKNOWN ARC Processor\n");

	n += scnprintf(buf + n, len - n, "CPU speed\t: %u.%02u Mhz\n",
		       (unsigned int)(arc_get_core_freq() / 1000000),
		       (unsigned int)(arc_get_core_freq() / 10000) % 100);

	n += scnprintf(buf + n, len - n, "Timers\t\t: %s%s%s%s\nISA Extn\t: ",
		       IS_AVAIL1(cpu->timers.t0, "Timer0 "),
		       IS_AVAIL1(cpu->timers.t1, "Timer1 "),
		       IS_AVAIL2(cpu->timers.rtc, "64-bit RTC ",
				 CONFIG_ARC_HAS_RTC));

	n += i = scnprintf(buf + n, len - n, "%s%s%s%s%s",
			   IS_AVAIL2(atomic, "atomic ", CONFIG_ARC_HAS_LLSC),
			   IS_AVAIL2(cpu->isa.ldd, "ll64 ", CONFIG_ARC_HAS_LL64),
			   IS_AVAIL1(cpu->isa.unalign, "unalign (not used)"));

	if (i)
		n += scnprintf(buf + n, len - n, "\n\t\t: ");

	if (cpu->extn_mpy.ver) {
		if (cpu->extn_mpy.ver <= 0x2) {	/* ARCompact */
			n += scnprintf(buf + n, len - n, "mpy ");
		} else {
			int opt = 2;	/* stock MPY/MPYH */

			if (cpu->extn_mpy.dsp)	/* OPT 7-9 */
				opt = cpu->extn_mpy.dsp + 6;

			n += scnprintf(buf + n, len - n, "mpy[opt %d] ", opt);
		}
		n += scnprintf(buf + n, len - n, "%s",
			       IS_USED_CFG(CONFIG_ARC_HAS_HW_MPY));
	}

	n += scnprintf(buf + n, len - n, "%s%s%s%s%s%s%s%s\n",
		       IS_AVAIL1(cpu->isa.div_rem, "div_rem "),
		       IS_AVAIL1(cpu->extn.norm, "norm "),
		       IS_AVAIL1(cpu->extn.barrel, "barrel-shift "),
		       IS_AVAIL1(cpu->extn.swap, "swap "),
		       IS_AVAIL1(cpu->extn.minmax, "minmax "),
		       IS_AVAIL1(cpu->extn.crc, "crc "),
		       IS_AVAIL2(1, "swape", CONFIG_ARC_HAS_SWAPE));

	if (cpu->bpu.ver)
		n += scnprintf(buf + n, len - n,
			      "BPU\t\t: %s%s match, cache:%d, Predict Table:%d\n",
			      IS_AVAIL1(cpu->bpu.full, "full"),
			      IS_AVAIL1(!cpu->bpu.full, "partial"),
			      cpu->bpu.num_cache, cpu->bpu.num_pred);

	return buf;
}

static char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len)
{
	int n = 0;
	struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];

	FIX_PTR(cpu);

	n += scnprintf(buf + n, len - n,
		       "Vector Table\t: %#x\nUncached Base\t: %#x\n",
		       cpu->vec_base, ARC_UNCACHED_ADDR_SPACE);

	if (cpu->extn.fpu_sp || cpu->extn.fpu_dp)
		n += scnprintf(buf + n, len - n, "FPU\t\t: %s%s\n",
			       IS_AVAIL1(cpu->extn.fpu_sp, "SP "),
			       IS_AVAIL1(cpu->extn.fpu_dp, "DP "));

	if (cpu->extn.debug)
		n += scnprintf(buf + n, len - n, "DEBUG\t\t: %s%s%s\n",
			       IS_AVAIL1(cpu->extn.ap, "ActionPoint "),
			       IS_AVAIL1(cpu->extn.smart, "smaRT "),
			       IS_AVAIL1(cpu->extn.rtt, "RTT "));

	if (cpu->dccm.sz || cpu->iccm.sz)
		n += scnprintf(buf + n, len - n, "Extn [CCM]\t: DCCM @ %x, %d KB / ICCM: @ %x, %d KB\n",
			       cpu->dccm.base_addr, TO_KB(cpu->dccm.sz),
			       cpu->iccm.base_addr, TO_KB(cpu->iccm.sz));

	n += scnprintf(buf + n, len - n,
		       "OS ABI [v3]\t: no-legacy-syscalls\n");

	return buf;
}

static void arc_chk_core_config(void)
{
	struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
	int fpu_enabled;

	if (!cpu->timers.t0)
		panic("Timer0 is not present!\n");

	if (!cpu->timers.t1)
		panic("Timer1 is not present!\n");

	if (IS_ENABLED(CONFIG_ARC_HAS_RTC) && !cpu->timers.rtc)
		panic("RTC is not present\n");

#ifdef CONFIG_ARC_HAS_DCCM
	/*
	 * DCCM can be arbit placed in hardware.
	 * Make sure it's placement/sz matches what Linux is built with
	 */
	if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr)
		panic("Linux built with incorrect DCCM Base address\n");

	if (CONFIG_ARC_DCCM_SZ != cpu->dccm.sz)
		panic("Linux built with incorrect DCCM Size\n");
#endif

#ifdef CONFIG_ARC_HAS_ICCM
	if (CONFIG_ARC_ICCM_SZ != cpu->iccm.sz)
		panic("Linux built with incorrect ICCM Size\n");
#endif

	/*
	 * FP hardware/software config sanity
	 * -If hardware contains DPFP, kernel needs to save/restore FPU state
	 * -If not, it will crash trying to save/restore the non-existant regs
	 *
	 * (only DPDP checked since SP has no arch visible regs)
	 */
	fpu_enabled = IS_ENABLED(CONFIG_ARC_FPU_SAVE_RESTORE);

	if (cpu->extn.fpu_dp && !fpu_enabled)
		pr_warn("CONFIG_ARC_FPU_SAVE_RESTORE needed for working apps\n");
	else if (!cpu->extn.fpu_dp && fpu_enabled)
		panic("FPU non-existent, disable CONFIG_ARC_FPU_SAVE_RESTORE\n");

	if (is_isa_arcv2() && IS_ENABLED(CONFIG_SMP) && cpu->isa.atomic &&
	    !IS_ENABLED(CONFIG_ARC_STAR_9000923308))
		panic("llock/scond livelock workaround missing\n");
}

/*
 * Initialize and setup the processor core
 * This is called by all the CPUs thus should not do special case stuff
 *    such as only for boot CPU etc
 */

void setup_processor(void)
{
	char str[512];
	int cpu_id = smp_processor_id();

	read_arc_build_cfg_regs();
	arc_init_IRQ();

	printk(arc_cpu_mumbojumbo(cpu_id, str, sizeof(str)));

	arc_mmu_init();
	arc_cache_init();

	printk(arc_extn_mumbojumbo(cpu_id, str, sizeof(str)));
	printk(arc_platform_smp_cpuinfo());

	arc_chk_core_config();
}

static inline int is_kernel(unsigned long addr)
{
	if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end)
		return 1;
	return 0;
}

void __init setup_arch(char **cmdline_p)
{
#ifdef CONFIG_ARC_UBOOT_SUPPORT
	/* make sure that uboot passed pointer to cmdline/dtb is valid */
	if (uboot_tag && is_kernel((unsigned long)uboot_arg))
		panic("Invalid uboot arg\n");

	/* See if u-boot passed an external Device Tree blob */
	machine_desc = setup_machine_fdt(uboot_arg);	/* uboot_tag == 2 */
	if (!machine_desc)
#endif
	{
		/* No, so try the embedded one */
		machine_desc = setup_machine_fdt(__dtb_start);
		if (!machine_desc)
			panic("Embedded DT invalid\n");

		/*
		 * If we are here, it is established that @uboot_arg didn't
		 * point to DT blob. Instead if u-boot says it is cmdline,
		 * Appent to embedded DT cmdline.
		 * setup_machine_fdt() would have populated @boot_command_line
		 */
		if (uboot_tag == 1) {
			/* Ensure a whitespace between the 2 cmdlines */
			strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
			strlcat(boot_command_line, uboot_arg,
				COMMAND_LINE_SIZE);
		}
	}

	/* Save unparsed command line copy for /proc/cmdline */
	*cmdline_p = boot_command_line;

	/* To force early parsing of things like mem=xxx */
	parse_early_param();

	/* Platform/board specific: e.g. early console registration */
	if (machine_desc->init_early)
		machine_desc->init_early();

	setup_processor();
	smp_init_cpus();
	setup_arch_memory();

	/* copy flat DT out of .init and then unflatten it */
	unflatten_and_copy_device_tree();

	/* Can be issue if someone passes cmd line arg "ro"
	 * But that is unlikely so keeping it as it is
	 */
	root_mountflags &= ~MS_RDONLY;

#if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
	conswitchp = &dummy_con;
#endif

	arc_unwind_init();
	arc_unwind_setup();
}

static int __init customize_machine(void)
{
	of_clk_init(NULL);
	/*
	 * Traverses flattened DeviceTree - registering platform devices
	 * (if any) complete with their resources
	 */
	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);

	if (machine_desc->init_machine)
		machine_desc->init_machine();

	return 0;
}
arch_initcall(customize_machine);

static int __init init_late_machine(void)
{
	if (machine_desc->init_late)
		machine_desc->init_late();

	return 0;
}
late_initcall(init_late_machine);
/*
 *  Get CPU information for use by the procfs.
 */

#define cpu_to_ptr(c)	((void *)(0xFFFF0000 | (unsigned int)(c)))
#define ptr_to_cpu(p)	(~0xFFFF0000UL & (unsigned int)(p))

static int show_cpuinfo(struct seq_file *m, void *v)
{
	char *str;
	int cpu_id = ptr_to_cpu(v);

	if (!cpu_online(cpu_id)) {
		seq_printf(m, "processor [%d]\t: Offline\n", cpu_id);
		goto done;
	}

	str = (char *)__get_free_page(GFP_TEMPORARY);
	if (!str)
		goto done;

	seq_printf(m, arc_cpu_mumbojumbo(cpu_id, str, PAGE_SIZE));

	seq_printf(m, "Bogo MIPS\t: %lu.%02lu\n",
		   loops_per_jiffy / (500000 / HZ),
		   (loops_per_jiffy / (5000 / HZ)) % 100);

	seq_printf(m, arc_mmu_mumbojumbo(cpu_id, str, PAGE_SIZE));
	seq_printf(m, arc_cache_mumbojumbo(cpu_id, str, PAGE_SIZE));
	seq_printf(m, arc_extn_mumbojumbo(cpu_id, str, PAGE_SIZE));
	seq_printf(m, arc_platform_smp_cpuinfo());

	free_page((unsigned long)str);
done:
	seq_printf(m, "\n");

	return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
	/*
	 * Callback returns cpu-id to iterator for show routine, NULL to stop.
	 * However since NULL is also a valid cpu-id (0), we use a round-about
	 * way to pass it w/o having to kmalloc/free a 2 byte string.
	 * Encode cpu-id as 0xFFcccc, which is decoded by show routine.
	 */
	return *pos < num_possible_cpus() ? cpu_to_ptr(*pos) : NULL;
}

static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
	++*pos;
	return c_start(m, pos);
}

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
};

static DEFINE_PER_CPU(struct cpu, cpu_topology);

static int __init topology_init(void)
{
	int cpu;

	for_each_present_cpu(cpu)
	    register_cpu(&per_cpu(cpu_topology, cpu), cpu);

	return 0;
}

subsys_initcall(topology_init);
Commit	Line	Data
c121c506 VG	1	/*
	2	* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*/
	8
	9	#include <linux/seq_file.h>
	10	#include <linux/fs.h>
	11	#include <linux/delay.h>
	12	#include <linux/root_dev.h>
	13	#include <linux/console.h>
	14	#include <linux/module.h>
	15	#include <linux/cpu.h>
d7f8a085	16	#include <linux/clk-provider.h>
999159a5	17	#include <linux/of_fdt.h>
d7f8a085	18	#include <linux/of_platform.h>
1ec9db10	19	#include <linux/cache.h>
999159a5	20	#include <asm/sections.h>
c121c506 VG	21	#include <asm/arcregs.h>
c121c506 VG	22	#include <asm/tlb.h>
c121c506 VG	23	#include <asm/setup.h>
	24	#include <asm/page.h>
	25	#include <asm/irq.h>
854a0d95	26	#include <asm/unwind.h>
af617428	27	#include <asm/clk.h>
03a6d28c	28	#include <asm/mach_desc.h>
619f3018	29	#include <asm/smp.h>
c121c506 VG	30
	31	#define FIX_PTR(x) __asm__ __volatile__(";" : "+r"(x))
	32
4255b07f VG	33	unsigned int intr_to_DE_cnt;
4255b07f VG	34
59ed9413 VG	35	/* Part of U-boot ABI: see head.S */
	36	int __initdata uboot_tag;
	37	char __initdata *uboot_arg;
	38
880beb88	39	const struct machine_desc *machine_desc;
c121c506 VG	40
	41	struct task_struct _current_task[NR_CPUS]; / For stack switching */
	42
	43	struct cpuinfo_arc cpuinfo_arc700[NR_CPUS];
	44
8e457d6a	45	static void read_arc_build_cfg_regs(void)
c121c506	46	{
af617428	47	struct bcr_perip uncached_space;
56372082	48	struct bcr_generic bcr;
af617428	49	struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
e13c42ec	50	unsigned long perip_space;
af617428 VG	51	FIX_PTR(cpu);
	52
	53	READ_BCR(AUX_IDENTITY, cpu->core);
56372082	54	READ_BCR(ARC_REG_ISA_CFG_BCR, cpu->isa);
af617428	55
56372082	56	READ_BCR(ARC_REG_TIMERS_BCR, cpu->timers);
af617428	57	cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE);
af617428 VG	58
af617428 VG	59	READ_BCR(ARC_REG_D_UNCACH_BCR, uncached_space);
e13c42ec VG	60	if (uncached_space.ver < 3)
	61	perip_space = uncached_space.start << 24;
	62	else
	63	perip_space = read_aux_reg(AUX_NON_VOL) & 0xF0000000;
	64
	65	BUG_ON(perip_space != ARC_UNCACHED_ADDR_SPACE);
af617428	66
56372082	67	READ_BCR(ARC_REG_MUL_BCR, cpu->extn_mpy);
af617428	68
56372082 VG	69	cpu->extn.norm = read_aux_reg(ARC_REG_NORM_BCR) > 1 ? 1 : 0; /* 2,3 */
	70	cpu->extn.barrel = read_aux_reg(ARC_REG_BARREL_BCR) > 1 ? 1 : 0; /* 2,3 */
	71	cpu->extn.swap = read_aux_reg(ARC_REG_SWAP_BCR) ? 1 : 0; /* 1,3 */
	72	cpu->extn.crc = read_aux_reg(ARC_REG_CRC_BCR) ? 1 : 0;
	73	cpu->extn.minmax = read_aux_reg(ARC_REG_MIXMAX_BCR) > 1 ? 1 : 0; /* 2 */
af617428	74
8b5850f8 VG	75	/* Note that we read the CCM BCRs independent of kernel config
	76	* This is to catch the cases where user doesn't know that
	77	* CCMs are present in hardware build
	78	*/
	79	{
	80	struct bcr_iccm iccm;
	81	struct bcr_dccm dccm;
	82	struct bcr_dccm_base dccm_base;
	83	unsigned int bcr_32bit_val;
	84
	85	bcr_32bit_val = read_aux_reg(ARC_REG_ICCM_BCR);
	86	if (bcr_32bit_val) {
	87	iccm = ((struct bcr_iccm )&bcr_32bit_val);
	88	cpu->iccm.base_addr = iccm.base << 16;
	89	cpu->iccm.sz = 0x2000 << (iccm.sz - 1);
	90	}
	91
	92	bcr_32bit_val = read_aux_reg(ARC_REG_DCCM_BCR);
	93	if (bcr_32bit_val) {
	94	dccm = ((struct bcr_dccm )&bcr_32bit_val);
	95	cpu->dccm.sz = 0x800 << (dccm.sz);
	96
	97	READ_BCR(ARC_REG_DCCMBASE_BCR, dccm_base);
	98	cpu->dccm.base_addr = dccm_base.addr << 8;
	99	}
	100	}
	101
af617428 VG	102	READ_BCR(ARC_REG_XY_MEM_BCR, cpu->extn_xymem);
af617428 VG	103
c121c506 VG	104	read_decode_mmu_bcr();
c121c506 VG	105	read_decode_cache_bcr();
af617428	106
1f6ccfff	107	if (is_isa_arcompact()) {
56372082 VG	108	struct bcr_fp_arcompact sp, dp;
	109	struct bcr_bpu_arcompact bpu;
	110
	111	READ_BCR(ARC_REG_FP_BCR, sp);
	112	READ_BCR(ARC_REG_DPFP_BCR, dp);
	113	cpu->extn.fpu_sp = sp.ver ? 1 : 0;
	114	cpu->extn.fpu_dp = dp.ver ? 1 : 0;
	115
	116	READ_BCR(ARC_REG_BPU_BCR, bpu);
	117	cpu->bpu.ver = bpu.ver;
	118	cpu->bpu.full = bpu.fam ? 1 : 0;
	119	if (bpu.ent) {
	120	cpu->bpu.num_cache = 256 << (bpu.ent - 1);
	121	cpu->bpu.num_pred = 256 << (bpu.ent - 1);
	122	}
1f6ccfff VG	123	} else {
	124	struct bcr_fp_arcv2 spdp;
	125	struct bcr_bpu_arcv2 bpu;
	126
	127	READ_BCR(ARC_REG_FP_V2_BCR, spdp);
	128	cpu->extn.fpu_sp = spdp.sp ? 1 : 0;
	129	cpu->extn.fpu_dp = spdp.dp ? 1 : 0;
	130
	131	READ_BCR(ARC_REG_BPU_BCR, bpu);
	132	cpu->bpu.ver = bpu.ver;
	133	cpu->bpu.full = bpu.ft;
	134	cpu->bpu.num_cache = 256 << bpu.bce;
	135	cpu->bpu.num_pred = 2048 << bpu.pte;
56372082 VG	136	}
	137
	138	READ_BCR(ARC_REG_AP_BCR, bcr);
	139	cpu->extn.ap = bcr.ver ? 1 : 0;
	140
	141	READ_BCR(ARC_REG_SMART_BCR, bcr);
	142	cpu->extn.smart = bcr.ver ? 1 : 0;
	143
a44ec8bd VG	144	READ_BCR(ARC_REG_RTT_BCR, bcr);
	145	cpu->extn.rtt = bcr.ver ? 1 : 0;
	146
	147	cpu->extn.debug = cpu->extn.ap \| cpu->extn.smart \| cpu->extn.rtt;
af617428 VG	148	}
	149
	150	static const struct cpuinfo_data arc_cpu_tbl[] = {
624b71ee	151	#ifdef CONFIG_ISA_ARCOMPACT
af617428 VG	152	{ {0x20, "ARC 600" }, 0x2F},
	153	{ {0x30, "ARC 700" }, 0x33},
	154	{ {0x34, "ARC 700 R4.10"}, 0x34},
56372082	155	{ {0x35, "ARC 700 R4.11"}, 0x35},
624b71ee VG	156	#else
	157	{ {0x50, "ARC HS38 R2.0"}, 0x51},
	158	{ {0x52, "ARC HS38 R2.1"}, 0x52},
	159	#endif
af617428 VG	160	{ {0x00, NULL } }
	161	};
	162
b631788a VG	163	#define IS_AVAIL1(v, s) ((v) ? s : "")
	164	#define IS_USED_RUN(v) ((v) ? "" : "(not used) ")
	165	#define IS_USED_CFG(cfg) IS_USED_RUN(IS_ENABLED(cfg))
	166	#define IS_AVAIL2(v, s, cfg) IS_AVAIL1(v, s), IS_AVAIL1(v, IS_USED_CFG(cfg))
56372082	167
8e457d6a	168	static char arc_cpu_mumbojumbo(int cpu_id, char buf, int len)
af617428	169	{
af617428 VG	170	struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
	171	struct bcr_identity *core = &cpu->core;
	172	const struct cpuinfo_data *tbl;
56372082 VG	173	char *isa_nm;
	174	int i, be, atomic;
	175	int n = 0;
	176
af617428 VG	177	FIX_PTR(cpu);
af617428 VG	178
1f6ccfff	179	if (is_isa_arcompact()) {
56372082 VG	180	isa_nm = "ARCompact";
	181	be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN);
	182
	183	atomic = cpu->isa.atomic1;
	184	if (!cpu->isa.ver) /* ISA BCR absent, use Kconfig info */
	185	atomic = IS_ENABLED(CONFIG_ARC_HAS_LLSC);
1f6ccfff VG	186	} else {
	187	isa_nm = "ARCv2";
	188	be = cpu->isa.be;
	189	atomic = cpu->isa.atomic;
56372082 VG	190	}
56372082 VG	191
af617428	192	n += scnprintf(buf + n, len - n,
56372082 VG	193	"\nIDENTITY\t: ARCVER [%#02x] ARCNUM [%#02x] CHIPID [%#4x]\n",
56372082 VG	194	core->family, core->cpu_id, core->chip_id);
af617428 VG	195
	196	for (tbl = &arc_cpu_tbl[0]; tbl->info.id != 0; tbl++) {
	197	if ((core->family >= tbl->info.id) &&
	198	(core->family <= tbl->up_range)) {
	199	n += scnprintf(buf + n, len - n,
56372082 VG	200	"processor [%d]\t: %s (%s ISA) %s\n",
	201	cpu_id, tbl->info.str, isa_nm,
	202	IS_AVAIL1(be, "[Big-Endian]"));
af617428 VG	203	break;
	204	}
	205	}
	206
	207	if (tbl->info.id == 0)
	208	n += scnprintf(buf + n, len - n, "UNKNOWN ARC Processor\n");
	209
	210	n += scnprintf(buf + n, len - n, "CPU speed\t: %u.%02u Mhz\n",
	211	(unsigned int)(arc_get_core_freq() / 1000000),
	212	(unsigned int)(arc_get_core_freq() / 10000) % 100);
	213
aa93e8ef	214	n += scnprintf(buf + n, len - n, "Timers\t\t: %s%s%s%s\nISA Extn\t: ",
56372082	215	IS_AVAIL1(cpu->timers.t0, "Timer0 "),
aa93e8ef VG	216	IS_AVAIL1(cpu->timers.t1, "Timer1 "),
	217	IS_AVAIL2(cpu->timers.rtc, "64-bit RTC ",
	218	CONFIG_ARC_HAS_RTC));
af617428	219
1f6ccfff VG	220	n += i = scnprintf(buf + n, len - n, "%s%s%s%s%s",
	221	IS_AVAIL2(atomic, "atomic ", CONFIG_ARC_HAS_LLSC),
	222	IS_AVAIL2(cpu->isa.ldd, "ll64 ", CONFIG_ARC_HAS_LL64),
	223	IS_AVAIL1(cpu->isa.unalign, "unalign (not used)"));
af617428	224
56372082 VG	225	if (i)
56372082 VG	226	n += scnprintf(buf + n, len - n, "\n\t\t: ");
af617428	227
1f6ccfff VG	228	if (cpu->extn_mpy.ver) {
	229	if (cpu->extn_mpy.ver <= 0x2) { /* ARCompact */
	230	n += scnprintf(buf + n, len - n, "mpy ");
	231	} else {
	232	int opt = 2; /* stock MPY/MPYH */
	233
	234	if (cpu->extn_mpy.dsp) /* OPT 7-9 */
	235	opt = cpu->extn_mpy.dsp + 6;
	236
	237	n += scnprintf(buf + n, len - n, "mpy[opt %d] ", opt);
	238	}
	239	n += scnprintf(buf + n, len - n, "%s",
b631788a	240	IS_USED_CFG(CONFIG_ARC_HAS_HW_MPY));
1f6ccfff VG	241	}
1f6ccfff VG	242
56372082	243	n += scnprintf(buf + n, len - n, "%s%s%s%s%s%s%s%s\n",
1f6ccfff	244	IS_AVAIL1(cpu->isa.div_rem, "div_rem "),
56372082 VG	245	IS_AVAIL1(cpu->extn.norm, "norm "),
	246	IS_AVAIL1(cpu->extn.barrel, "barrel-shift "),
	247	IS_AVAIL1(cpu->extn.swap, "swap "),
	248	IS_AVAIL1(cpu->extn.minmax, "minmax "),
	249	IS_AVAIL1(cpu->extn.crc, "crc "),
	250	IS_AVAIL2(1, "swape", CONFIG_ARC_HAS_SWAPE));
af617428	251
56372082 VG	252	if (cpu->bpu.ver)
	253	n += scnprintf(buf + n, len - n,
	254	"BPU\t\t: %s%s match, cache:%d, Predict Table:%d\n",
	255	IS_AVAIL1(cpu->bpu.full, "full"),
	256	IS_AVAIL1(!cpu->bpu.full, "partial"),
	257	cpu->bpu.num_cache, cpu->bpu.num_pred);
af617428	258
56372082 VG	259	return buf;
56372082 VG	260	}
af617428	261
8e457d6a	262	static char arc_extn_mumbojumbo(int cpu_id, char buf, int len)
af617428 VG	263	{
	264	int n = 0;
	265	struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
	266
	267	FIX_PTR(cpu);
af617428 VG	268
af617428 VG	269	n += scnprintf(buf + n, len - n,
56372082	270	"Vector Table\t: %#x\nUncached Base\t: %#x\n",
10d11e58	271	cpu->vec_base, ARC_UNCACHED_ADDR_SPACE);
56372082 VG	272
	273	if (cpu->extn.fpu_sp \|\| cpu->extn.fpu_dp)
	274	n += scnprintf(buf + n, len - n, "FPU\t\t: %s%s\n",
	275	IS_AVAIL1(cpu->extn.fpu_sp, "SP "),
	276	IS_AVAIL1(cpu->extn.fpu_dp, "DP "));
	277
	278	if (cpu->extn.debug)
	279	n += scnprintf(buf + n, len - n, "DEBUG\t\t: %s%s%s\n",
	280	IS_AVAIL1(cpu->extn.ap, "ActionPoint "),
	281	IS_AVAIL1(cpu->extn.smart, "smaRT "),
	282	IS_AVAIL1(cpu->extn.rtt, "RTT "));
	283
	284	if (cpu->dccm.sz \|\| cpu->iccm.sz)
	285	n += scnprintf(buf + n, len - n, "Extn [CCM]\t: DCCM @ %x, %d KB / ICCM: @ %x, %d KB\n",
	286	cpu->dccm.base_addr, TO_KB(cpu->dccm.sz),
af617428 VG	287	cpu->iccm.base_addr, TO_KB(cpu->iccm.sz));
af617428 VG	288
af617428	289	n += scnprintf(buf + n, len - n,
8ff14bbc	290	"OS ABI [v3]\t: no-legacy-syscalls\n");
af617428 VG	291
	292	return buf;
	293	}
	294
c4b9856b	295	static void arc_chk_core_config(void)
8b5850f8	296	{
8b5850f8	297	struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
c4b9856b	298	int fpu_enabled;
8b5850f8	299
56372082 VG	300	if (!cpu->timers.t0)
	301	panic("Timer0 is not present!\n");
	302
	303	if (!cpu->timers.t1)
	304	panic("Timer1 is not present!\n");
	305
aa93e8ef VG	306	if (IS_ENABLED(CONFIG_ARC_HAS_RTC) && !cpu->timers.rtc)
	307	panic("RTC is not present\n");
	308
8b5850f8 VG	309	#ifdef CONFIG_ARC_HAS_DCCM
	310	/*
	311	* DCCM can be arbit placed in hardware.
	312	* Make sure it's placement/sz matches what Linux is built with
	313	*/
	314	if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr)
	315	panic("Linux built with incorrect DCCM Base address\n");
	316
	317	if (CONFIG_ARC_DCCM_SZ != cpu->dccm.sz)
	318	panic("Linux built with incorrect DCCM Size\n");
	319	#endif
	320
	321	#ifdef CONFIG_ARC_HAS_ICCM
	322	if (CONFIG_ARC_ICCM_SZ != cpu->iccm.sz)
	323	panic("Linux built with incorrect ICCM Size\n");
	324	#endif
8b5850f8	325
c4b9856b VG	326	/*
	327	* FP hardware/software config sanity
	328	* -If hardware contains DPFP, kernel needs to save/restore FPU state
	329	* -If not, it will crash trying to save/restore the non-existant regs
	330	*
	331	* (only DPDP checked since SP has no arch visible regs)
	332	*/
	333	fpu_enabled = IS_ENABLED(CONFIG_ARC_FPU_SAVE_RESTORE);
af617428	334
56372082	335	if (cpu->extn.fpu_dp && !fpu_enabled)
c4b9856b	336	pr_warn("CONFIG_ARC_FPU_SAVE_RESTORE needed for working apps\n");
56372082	337	else if (!cpu->extn.fpu_dp && fpu_enabled)
c4b9856b	338	panic("FPU non-existent, disable CONFIG_ARC_FPU_SAVE_RESTORE\n");
e78fdfef VG	339
	340	if (is_isa_arcv2() && IS_ENABLED(CONFIG_SMP) && cpu->isa.atomic &&
	341	!IS_ENABLED(CONFIG_ARC_STAR_9000923308))
	342	panic("llock/scond livelock workaround missing\n");
c121c506 VG	343	}
	344
	345	/*
	346	* Initialize and setup the processor core
	347	* This is called by all the CPUs thus should not do special case stuff
	348	* such as only for boot CPU etc
	349	*/
	350
ce759956	351	void setup_processor(void)
c121c506	352	{
af617428 VG	353	char str[512];
	354	int cpu_id = smp_processor_id();
	355
c121c506 VG	356	read_arc_build_cfg_regs();
c121c506 VG	357	arc_init_IRQ();
af617428 VG	358
	359	printk(arc_cpu_mumbojumbo(cpu_id, str, sizeof(str)));
	360
c121c506 VG	361	arc_mmu_init();
c121c506 VG	362	arc_cache_init();
af617428 VG	363
af617428 VG	364	printk(arc_extn_mumbojumbo(cpu_id, str, sizeof(str)));
af617428	365	printk(arc_platform_smp_cpuinfo());
af617428	366
c4b9856b	367	arc_chk_core_config();
c121c506 VG	368	}
c121c506 VG	369
59ed9413 VG	370	static inline int is_kernel(unsigned long addr)
	371	{
	372	if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end)
	373	return 1;
	374	return 0;
	375	}
	376
c121c506 VG	377	void __init setup_arch(char **cmdline_p)
c121c506 VG	378	{
036b2c56	379	#ifdef CONFIG_ARC_UBOOT_SUPPORT
e57d339a VG	380	/* make sure that uboot passed pointer to cmdline/dtb is valid */
	381	if (uboot_tag && is_kernel((unsigned long)uboot_arg))
	382	panic("Invalid uboot arg\n");
	383
	384	/* See if u-boot passed an external Device Tree blob */
	385	machine_desc = setup_machine_fdt(uboot_arg); /* uboot_tag == 2 */
036b2c56 VG	386	if (!machine_desc)
	387	#endif
	388	{
e57d339a	389	/* No, so try the embedded one */
59ed9413 VG	390	machine_desc = setup_machine_fdt(__dtb_start);
	391	if (!machine_desc)
	392	panic("Embedded DT invalid\n");
	393
	394	/*
e57d339a VG	395	* If we are here, it is established that @uboot_arg didn't
	396	* point to DT blob. Instead if u-boot says it is cmdline,
	397	* Appent to embedded DT cmdline.
59ed9413 VG	398	* setup_machine_fdt() would have populated @boot_command_line
	399	*/
	400	if (uboot_tag == 1) {
59ed9413 VG	401	/* Ensure a whitespace between the 2 cmdlines */
	402	strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
	403	strlcat(boot_command_line, uboot_arg,
	404	COMMAND_LINE_SIZE);
	405	}
e57d339a	406	}
c121c506 VG	407
c121c506 VG	408	/* Save unparsed command line copy for /proc/cmdline */
9593a933	409	*cmdline_p = boot_command_line;
999159a5	410
c121c506 VG	411	/* To force early parsing of things like mem=xxx */
	412	parse_early_param();
	413
	414	/* Platform/board specific: e.g. early console registration */
03a6d28c VG	415	if (machine_desc->init_early)
03a6d28c VG	416	machine_desc->init_early();
c121c506 VG	417
c121c506 VG	418	setup_processor();
41195d23	419	smp_init_cpus();
c121c506 VG	420	setup_arch_memory();
c121c506 VG	421
eab6a08c	422	/* copy flat DT out of .init and then unflatten it */
1efc959e	423	unflatten_and_copy_device_tree();
999159a5	424
c121c506 VG	425	/* Can be issue if someone passes cmd line arg "ro"
	426	* But that is unlikely so keeping it as it is
	427	*/
	428	root_mountflags &= ~MS_RDONLY;
	429
c121c506 VG	430	#if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
	431	conswitchp = &dummy_con;
	432	#endif
	433
854a0d95 VG	434	arc_unwind_init();
854a0d95 VG	435	arc_unwind_setup();
c121c506 VG	436	}
c121c506 VG	437
03a6d28c VG	438	static int __init customize_machine(void)
03a6d28c VG	439	{
d7f8a085 VG	440	of_clk_init(NULL);
	441	/*
	442	* Traverses flattened DeviceTree - registering platform devices
	443	* (if any) complete with their resources
	444	*/
	445	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
	446
03a6d28c VG	447	if (machine_desc->init_machine)
	448	machine_desc->init_machine();
	449
	450	return 0;
	451	}
	452	arch_initcall(customize_machine);
	453
	454	static int __init init_late_machine(void)
	455	{
	456	if (machine_desc->init_late)
	457	machine_desc->init_late();
	458
	459	return 0;
	460	}
	461	late_initcall(init_late_machine);
c121c506 VG	462	/*
	463	* Get CPU information for use by the procfs.
	464	*/
	465
	466	#define cpu_to_ptr(c) ((void *)(0xFFFF0000 \| (unsigned int)(c)))
	467	#define ptr_to_cpu(p) (~0xFFFF0000UL & (unsigned int)(p))
	468
	469	static int show_cpuinfo(struct seq_file m, void v)
	470	{
	471	char *str;
	472	int cpu_id = ptr_to_cpu(v);
	473
4c86231c VG	474	if (!cpu_online(cpu_id)) {
	475	seq_printf(m, "processor [%d]\t: Offline\n", cpu_id);
	476	goto done;
	477	}
	478
c121c506 VG	479	str = (char *)__get_free_page(GFP_TEMPORARY);
	480	if (!str)
	481	goto done;
	482
af617428	483	seq_printf(m, arc_cpu_mumbojumbo(cpu_id, str, PAGE_SIZE));
c121c506	484
56372082	485	seq_printf(m, "Bogo MIPS\t: %lu.%02lu\n",
c121c506 VG	486	loops_per_jiffy / (500000 / HZ),
	487	(loops_per_jiffy / (5000 / HZ)) % 100);
	488
af617428	489	seq_printf(m, arc_mmu_mumbojumbo(cpu_id, str, PAGE_SIZE));
af617428	490	seq_printf(m, arc_cache_mumbojumbo(cpu_id, str, PAGE_SIZE));
af617428	491	seq_printf(m, arc_extn_mumbojumbo(cpu_id, str, PAGE_SIZE));
af617428	492	seq_printf(m, arc_platform_smp_cpuinfo());
af617428	493
c121c506 VG	494	free_page((unsigned long)str);
c121c506 VG	495	done:
4c86231c	496	seq_printf(m, "\n");
c121c506 VG	497
	498	return 0;
	499	}
	500
	501	static void c_start(struct seq_file m, loff_t *pos)
	502	{
	503	/*
	504	* Callback returns cpu-id to iterator for show routine, NULL to stop.
	505	* However since NULL is also a valid cpu-id (0), we use a round-about
	506	* way to pass it w/o having to kmalloc/free a 2 byte string.
	507	* Encode cpu-id as 0xFFcccc, which is decoded by show routine.
	508	*/
	509	return pos < num_possible_cpus() ? cpu_to_ptr(pos) : NULL;
	510	}
	511
	512	static void c_next(struct seq_file m, void v, loff_t pos)
	513	{
	514	++*pos;
	515	return c_start(m, pos);
	516	}
	517
	518	static void c_stop(struct seq_file m, void v)
	519	{
	520	}
	521
	522	const struct seq_operations cpuinfo_op = {
	523	.start = c_start,
	524	.next = c_next,
	525	.stop = c_stop,
	526	.show = show_cpuinfo
	527	};
	528
	529	static DEFINE_PER_CPU(struct cpu, cpu_topology);
	530
	531	static int __init topology_init(void)
	532	{
	533	int cpu;
	534
	535	for_each_present_cpu(cpu)
	536	register_cpu(&per_cpu(cpu_topology, cpu), cpu);
	537
	538	return 0;
	539	}
	540
	541	subsys_initcall(topology_init);