| /* |
| * 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)) |
| |
| /* 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()]; |
| 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); |
| cpu->uncached_base = uncached_space.start << 24; |
| |
| 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(); |
| |
| { |
| 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); |
| } |
| } |
| |
| 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[] = { |
| { {0x20, "ARC 600" }, 0x2F}, |
| { {0x30, "ARC 700" }, 0x33}, |
| { {0x34, "ARC 700 R4.10"}, 0x34}, |
| { {0x35, "ARC 700 R4.11"}, 0x35}, |
| { {0x00, NULL } } |
| }; |
| |
| #define IS_AVAIL1(v, str) ((v) ? str : "") |
| #define IS_USED(cfg) (IS_ENABLED(cfg) ? "" : "(not used) ") |
| #define IS_AVAIL2(v, str, cfg) IS_AVAIL1(v, str), IS_AVAIL1(v, IS_USED(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); |
| |
| { |
| 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); |
| } |
| |
| 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.rtsc, "64-bit RTSC ", CONFIG_ARC_HAS_RTSC)); |
| |
| n += i = scnprintf(buf + n, len - n, "%s%s", |
| IS_AVAIL2(atomic, "atomic ", CONFIG_ARC_HAS_LLSC)); |
| |
| if (i) |
| n += scnprintf(buf + n, len - n, "\n\t\t: "); |
| |
| n += scnprintf(buf + n, len - n, "%s%s%s%s%s%s%s%s\n", |
| IS_AVAIL1(cpu->extn_mpy.ver, "mpy "), |
| 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, cpu->uncached_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 [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_RTSC) && !cpu->timers.rtsc) |
| panic("RTSC 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) |
| { |
| /* 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) { |
| /* 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); |