/* * 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/clk-provider.h>#include <linux/clocksource.h>#include <linux/console.h>#include <linux/module.h>#include <linux/cpu.h>#include <linux/of_fdt.h>#include <linux/of.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/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 const struct id_to_str arc_cpu_rel[] = {#ifdef CONFIG_ISA_ARCOMPACT { 0x34, "R4.10"}, { 0x35, "R4.11"},#else { 0x51, "R2.0" }, { 0x52, "R2.1" }, { 0x53, "R3.0" },#endif { 0x00, NULL }}; static const struct id_to_str arc_cpu_nm[] = {#ifdef CONFIG_ISA_ARCOMPACT { 0x20, "ARC 600" }, { 0x30, "ARC 770" }, /* 750 identified seperately */#else { 0x40, "ARC EM" }, { 0x50, "ARC HS38" },#endif { 0x00, "Unknown" }}; static void read_decode_ccm_bcr(struct cpuinfo_arc *cpu){ if (is_isa_arcompact()) { struct bcr_iccm_arcompact iccm; struct bcr_dccm_arcompact dccm; READ_BCR(ARC_REG_ICCM_BUILD, iccm); if (iccm.ver) { cpu->iccm.sz = 4096 << iccm.sz; /* 8K to 512K */ cpu->iccm.base_addr = iccm.base << 16; } READ_BCR(ARC_REG_DCCM_BUILD, dccm); if (dccm.ver) { unsigned long base; cpu->dccm.sz = 2048 << dccm.sz; /* 2K to 256K */ base = read_aux_reg(ARC_REG_DCCM_BASE_BUILD); cpu->dccm.base_addr = base & ~0xF; } } else { struct bcr_iccm_arcv2 iccm; struct bcr_dccm_arcv2 dccm; unsigned long region; READ_BCR(ARC_REG_ICCM_BUILD, iccm); if (iccm.ver) { cpu->iccm.sz = 256 << iccm.sz00; /* 512B to 16M */ if (iccm.sz00 == 0xF && iccm.sz01 > 0) cpu->iccm.sz <<= iccm.sz01; region = read_aux_reg(ARC_REG_AUX_ICCM); cpu->iccm.base_addr = region & 0xF0000000; } READ_BCR(ARC_REG_DCCM_BUILD, dccm); if (dccm.ver) { cpu->dccm.sz = 256 << dccm.sz0; if (dccm.sz0 == 0xF && dccm.sz1 > 0) cpu->dccm.sz <<= dccm.sz1; region = read_aux_reg(ARC_REG_AUX_DCCM); cpu->dccm.base_addr = region & 0xF0000000; } }} static void read_arc_build_cfg_regs(void){ struct bcr_timer timer; struct bcr_generic bcr; struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()]; const struct id_to_str *tbl; FIX_PTR(cpu); READ_BCR(AUX_IDENTITY, cpu->core); READ_BCR(ARC_REG_ISA_CFG_BCR, cpu->isa); for (tbl = &arc_cpu_rel[0]; tbl->id != 0; tbl++) { if (cpu->core.family == tbl->id) { cpu->details = tbl->str; break; } } for (tbl = &arc_cpu_nm[0]; tbl->id != 0; tbl++) { if ((cpu->core.family & 0xF0) == tbl->id) break; } cpu->name = tbl->str; READ_BCR(ARC_REG_TIMERS_BCR, timer); cpu->extn.timer0 = timer.t0; cpu->extn.timer1 = timer.t1; cpu->extn.rtc = timer.rtc; cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE); 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 */ cpu->extn.swape = (cpu->core.family >= 0x34) ? 1 : IS_ENABLED(CONFIG_ARC_HAS_SWAPE); READ_BCR(ARC_REG_XY_MEM_BCR, cpu->extn_xymem); /* Read CCM BCRs for boot reporting even if not enabled in Kconfig */ read_decode_ccm_bcr(cpu); 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; /* some hacks for lack of feature BCR info in old ARC700 cores */ if (is_isa_arcompact()) { if (!cpu->isa.ver) /* ISA BCR absent, use Kconfig info */ cpu->isa.atomic = IS_ENABLED(CONFIG_ARC_HAS_LLSC); else cpu->isa.atomic = cpu->isa.atomic1; cpu->isa.be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN); /* there's no direct way to distinguish 750 vs. 770 */ if (unlikely(cpu->core.family < 0x34 || cpu->mmu.ver < 3)) cpu->name = "ARC750"; }} 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; int i, n = 0; FIX_PTR(cpu); n += scnprintf(buf + n, len - n, "\nIDENTITY\t: ARCVER [%#02x] ARCNUM [%#02x] CHIPID [%#4x]\n", core->family, core->cpu_id, core->chip_id); n += scnprintf(buf + n, len - n, "processor [%d]\t: %s %s (%s ISA) %s\n", cpu_id, cpu->name, cpu->details, is_isa_arcompact() ? "ARCompact" : "ARCv2", IS_AVAIL1(cpu->isa.be, "[Big-Endian]")); n += scnprintf(buf + n, len - n, "Timers\t\t: %s%s%s%s%s%s\nISA Extn\t: ", IS_AVAIL1(cpu->extn.timer0, "Timer0 "), IS_AVAIL1(cpu->extn.timer1, "Timer1 "), IS_AVAIL2(cpu->extn.rtc, "RTC [UP 64-bit] ", CONFIG_ARC_TIMERS_64BIT), IS_AVAIL2(cpu->extn.gfrc, "GFRC [SMP 64-bit] ", CONFIG_ARC_TIMERS_64BIT)); n += i = scnprintf(buf + n, len - n, "%s%s%s%s%s", IS_AVAIL2(cpu->isa.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%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(cpu->extn.swape, "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\n", cpu->vec_base); 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 [v%d]\t: %s\n", EF_ARC_OSABI_CURRENT >> 8, EF_ARC_OSABI_CURRENT == EF_ARC_OSABI_V3 ? "no-legacy-syscalls" : "64-bit data any register aligned"); return buf;} static void arc_chk_core_config(void){ struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()]; int fpu_enabled; if (!cpu->extn.timer0) panic("Timer0 is not present!\n"); if (!cpu->extn.timer1) panic("Timer1 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");} /* * 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, * append 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(); smp_init_cpus(); setup_processor(); 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();} /* * Called from start_kernel() - boot CPU only */void __init time_init(void){ of_clk_init(NULL); clocksource_probe();} static int __init customize_machine(void){ 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); struct device_node *core_clk = of_find_node_by_name(NULL, "core_clk"); u32 freq = 0; 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)Lines 1–500 of 566. 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/* * 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/clk-provider.h> #include <linux/clocksource.h> #include <linux/console.h> #include <linux/module.h> #include <linux/cpu.h> #include <linux/of_fdt.h> #include <linux/of.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/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 const struct id_to_str arc_cpu_rel[] = { #ifdef CONFIG_ISA_ARCOMPACT { 0x34, "R4.10"}, { 0x35, "R4.11"}, #else { 0x51, "R2.0" }, { 0x52, "R2.1" }, { 0x53, "R3.0" }, #endif { 0x00, NULL } }; static const struct id_to_str arc_cpu_nm[] = { #ifdef CONFIG_ISA_ARCOMPACT { 0x20, "ARC 600" }, { 0x30, "ARC 770" }, /* 750 identified seperately */ #else { 0x40, "ARC EM" }, { 0x50, "ARC HS38" }, #endif { 0x00, "Unknown" } }; static void read_decode_ccm_bcr(struct cpuinfo_arc *cpu) { if (is_isa_arcompact()) { struct bcr_iccm_arcompact iccm; struct bcr_dccm_arcompact dccm; READ_BCR(ARC_REG_ICCM_BUILD, iccm); if (iccm.ver) { cpu->iccm.sz = 4096 << iccm.sz; /* 8K to 512K */ cpu->iccm.base_addr = iccm.base << 16; } READ_BCR(ARC_REG_DCCM_BUILD, dccm); if (dccm.ver) { unsigned long base; cpu->dccm.sz = 2048 << dccm.sz; /* 2K to 256K */ base = read_aux_reg(ARC_REG_DCCM_BASE_BUILD); cpu->dccm.base_addr = base & ~0xF; } } else { struct bcr_iccm_arcv2 iccm; struct bcr_dccm_arcv2 dccm; unsigned long region; READ_BCR(ARC_REG_ICCM_BUILD, iccm); if (iccm.ver) { cpu->iccm.sz = 256 << iccm.sz00; /* 512B to 16M */ if (iccm.sz00 == 0xF && iccm.sz01 > 0) cpu->iccm.sz <<= iccm.sz01; region = read_aux_reg(ARC_REG_AUX_ICCM); cpu->iccm.base_addr = region & 0xF0000000; } READ_BCR(ARC_REG_DCCM_BUILD, dccm); if (dccm.ver) { cpu->dccm.sz = 256 << dccm.sz0; if (dccm.sz0 == 0xF && dccm.sz1 > 0) cpu->dccm.sz <<= dccm.sz1; region = read_aux_reg(ARC_REG_AUX_DCCM); cpu->dccm.base_addr = region & 0xF0000000; } } } static void read_arc_build_cfg_regs(void) { struct bcr_timer timer; struct bcr_generic bcr; struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()]; const struct id_to_str *tbl; FIX_PTR(cpu); READ_BCR(AUX_IDENTITY, cpu->core); READ_BCR(ARC_REG_ISA_CFG_BCR, cpu->isa); for (tbl = &arc_cpu_rel[0]; tbl->id != 0; tbl++) { if (cpu->core.family == tbl->id) { cpu->details = tbl->str; break; } } for (tbl = &arc_cpu_nm[0]; tbl->id != 0; tbl++) { if ((cpu->core.family & 0xF0) == tbl->id) break; } cpu->name = tbl->str; READ_BCR(ARC_REG_TIMERS_BCR, timer); cpu->extn.timer0 = timer.t0; cpu->extn.timer1 = timer.t1; cpu->extn.rtc = timer.rtc; cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE); 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 */ cpu->extn.swape = (cpu->core.family >= 0x34) ? 1 : IS_ENABLED(CONFIG_ARC_HAS_SWAPE); READ_BCR(ARC_REG_XY_MEM_BCR, cpu->extn_xymem); /* Read CCM BCRs for boot reporting even if not enabled in Kconfig */ read_decode_ccm_bcr(cpu); 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; /* some hacks for lack of feature BCR info in old ARC700 cores */ if (is_isa_arcompact()) { if (!cpu->isa.ver) /* ISA BCR absent, use Kconfig info */ cpu->isa.atomic = IS_ENABLED(CONFIG_ARC_HAS_LLSC); else cpu->isa.atomic = cpu->isa.atomic1; cpu->isa.be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN); /* there's no direct way to distinguish 750 vs. 770 */ if (unlikely(cpu->core.family < 0x34 || cpu->mmu.ver < 3)) cpu->name = "ARC750"; } } 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; int i, n = 0; FIX_PTR(cpu); n += scnprintf(buf + n, len - n, "\nIDENTITY\t: ARCVER [%#02x] ARCNUM [%#02x] CHIPID [%#4x]\n", core->family, core->cpu_id, core->chip_id); n += scnprintf(buf + n, len - n, "processor [%d]\t: %s %s (%s ISA) %s\n", cpu_id, cpu->name, cpu->details, is_isa_arcompact() ? "ARCompact" : "ARCv2", IS_AVAIL1(cpu->isa.be, "[Big-Endian]")); n += scnprintf(buf + n, len - n, "Timers\t\t: %s%s%s%s%s%s\nISA Extn\t: ", IS_AVAIL1(cpu->extn.timer0, "Timer0 "), IS_AVAIL1(cpu->extn.timer1, "Timer1 "), IS_AVAIL2(cpu->extn.rtc, "RTC [UP 64-bit] ", CONFIG_ARC_TIMERS_64BIT), IS_AVAIL2(cpu->extn.gfrc, "GFRC [SMP 64-bit] ", CONFIG_ARC_TIMERS_64BIT)); n += i = scnprintf(buf + n, len - n, "%s%s%s%s%s", IS_AVAIL2(cpu->isa.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%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(cpu->extn.swape, "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\n", cpu->vec_base); 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 [v%d]\t: %s\n", EF_ARC_OSABI_CURRENT >> 8, EF_ARC_OSABI_CURRENT == EF_ARC_OSABI_V3 ? "no-legacy-syscalls" : "64-bit data any register aligned"); return buf; } static void arc_chk_core_config(void) { struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()]; int fpu_enabled; if (!cpu->extn.timer0) panic("Timer0 is not present!\n"); if (!cpu->extn.timer1) panic("Timer1 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"); } /* * 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, * append 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(); smp_init_cpus(); setup_processor(); 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(); } /* * Called from start_kernel() - boot CPU only */ void __init time_init(void) { of_clk_init(NULL); clocksource_probe(); } static int __init customize_machine(void) { 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); struct device_node *core_clk = of_find_node_by_name(NULL, "core_clk"); u32 freq = 0; 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)