546 lines
14 KiB
C
546 lines
14 KiB
C
/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/seq_file.h>
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#include <linux/fs.h>
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#include <linux/delay.h>
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#include <linux/root_dev.h>
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#include <linux/console.h>
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#include <linux/module.h>
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#include <linux/cpu.h>
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#include <linux/of_fdt.h>
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#include <linux/of_platform.h>
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#include <linux/cache.h>
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#include <asm/sections.h>
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#include <asm/arcregs.h>
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#include <asm/tlb.h>
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#include <asm/setup.h>
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#include <asm/page.h>
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#include <asm/irq.h>
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#include <asm/unwind.h>
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#include <asm/mach_desc.h>
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#include <asm/smp.h>
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#define FIX_PTR(x) __asm__ __volatile__(";" : "+r"(x))
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unsigned int intr_to_DE_cnt;
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/* Part of U-boot ABI: see head.S */
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int __initdata uboot_tag;
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char __initdata *uboot_arg;
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const struct machine_desc *machine_desc;
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struct task_struct *_current_task[NR_CPUS]; /* For stack switching */
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struct cpuinfo_arc cpuinfo_arc700[NR_CPUS];
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static void read_decode_ccm_bcr(struct cpuinfo_arc *cpu)
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{
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if (is_isa_arcompact()) {
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struct bcr_iccm_arcompact iccm;
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struct bcr_dccm_arcompact dccm;
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READ_BCR(ARC_REG_ICCM_BUILD, iccm);
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if (iccm.ver) {
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cpu->iccm.sz = 4096 << iccm.sz; /* 8K to 512K */
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cpu->iccm.base_addr = iccm.base << 16;
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}
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READ_BCR(ARC_REG_DCCM_BUILD, dccm);
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if (dccm.ver) {
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unsigned long base;
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cpu->dccm.sz = 2048 << dccm.sz; /* 2K to 256K */
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base = read_aux_reg(ARC_REG_DCCM_BASE_BUILD);
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cpu->dccm.base_addr = base & ~0xF;
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}
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} else {
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struct bcr_iccm_arcv2 iccm;
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struct bcr_dccm_arcv2 dccm;
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unsigned long region;
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READ_BCR(ARC_REG_ICCM_BUILD, iccm);
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if (iccm.ver) {
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cpu->iccm.sz = 256 << iccm.sz00; /* 512B to 16M */
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if (iccm.sz00 == 0xF && iccm.sz01 > 0)
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cpu->iccm.sz <<= iccm.sz01;
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region = read_aux_reg(ARC_REG_AUX_ICCM);
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cpu->iccm.base_addr = region & 0xF0000000;
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}
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READ_BCR(ARC_REG_DCCM_BUILD, dccm);
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if (dccm.ver) {
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cpu->dccm.sz = 256 << dccm.sz0;
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if (dccm.sz0 == 0xF && dccm.sz1 > 0)
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cpu->dccm.sz <<= dccm.sz1;
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region = read_aux_reg(ARC_REG_AUX_DCCM);
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cpu->dccm.base_addr = region & 0xF0000000;
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}
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}
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}
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static void read_arc_build_cfg_regs(void)
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{
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struct bcr_timer timer;
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struct bcr_generic bcr;
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struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
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FIX_PTR(cpu);
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READ_BCR(AUX_IDENTITY, cpu->core);
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READ_BCR(ARC_REG_ISA_CFG_BCR, cpu->isa);
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READ_BCR(ARC_REG_TIMERS_BCR, timer);
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cpu->extn.timer0 = timer.t0;
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cpu->extn.timer1 = timer.t1;
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cpu->extn.rtc = timer.rtc;
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cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE);
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READ_BCR(ARC_REG_MUL_BCR, cpu->extn_mpy);
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cpu->extn.norm = read_aux_reg(ARC_REG_NORM_BCR) > 1 ? 1 : 0; /* 2,3 */
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cpu->extn.barrel = read_aux_reg(ARC_REG_BARREL_BCR) > 1 ? 1 : 0; /* 2,3 */
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cpu->extn.swap = read_aux_reg(ARC_REG_SWAP_BCR) ? 1 : 0; /* 1,3 */
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cpu->extn.crc = read_aux_reg(ARC_REG_CRC_BCR) ? 1 : 0;
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cpu->extn.minmax = read_aux_reg(ARC_REG_MIXMAX_BCR) > 1 ? 1 : 0; /* 2 */
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READ_BCR(ARC_REG_XY_MEM_BCR, cpu->extn_xymem);
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/* Read CCM BCRs for boot reporting even if not enabled in Kconfig */
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read_decode_ccm_bcr(cpu);
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read_decode_mmu_bcr();
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read_decode_cache_bcr();
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if (is_isa_arcompact()) {
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struct bcr_fp_arcompact sp, dp;
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struct bcr_bpu_arcompact bpu;
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READ_BCR(ARC_REG_FP_BCR, sp);
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READ_BCR(ARC_REG_DPFP_BCR, dp);
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cpu->extn.fpu_sp = sp.ver ? 1 : 0;
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cpu->extn.fpu_dp = dp.ver ? 1 : 0;
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READ_BCR(ARC_REG_BPU_BCR, bpu);
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cpu->bpu.ver = bpu.ver;
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cpu->bpu.full = bpu.fam ? 1 : 0;
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if (bpu.ent) {
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cpu->bpu.num_cache = 256 << (bpu.ent - 1);
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cpu->bpu.num_pred = 256 << (bpu.ent - 1);
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}
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} else {
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struct bcr_fp_arcv2 spdp;
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struct bcr_bpu_arcv2 bpu;
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READ_BCR(ARC_REG_FP_V2_BCR, spdp);
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cpu->extn.fpu_sp = spdp.sp ? 1 : 0;
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cpu->extn.fpu_dp = spdp.dp ? 1 : 0;
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READ_BCR(ARC_REG_BPU_BCR, bpu);
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cpu->bpu.ver = bpu.ver;
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cpu->bpu.full = bpu.ft;
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cpu->bpu.num_cache = 256 << bpu.bce;
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cpu->bpu.num_pred = 2048 << bpu.pte;
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}
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READ_BCR(ARC_REG_AP_BCR, bcr);
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cpu->extn.ap = bcr.ver ? 1 : 0;
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READ_BCR(ARC_REG_SMART_BCR, bcr);
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cpu->extn.smart = bcr.ver ? 1 : 0;
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READ_BCR(ARC_REG_RTT_BCR, bcr);
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cpu->extn.rtt = bcr.ver ? 1 : 0;
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cpu->extn.debug = cpu->extn.ap | cpu->extn.smart | cpu->extn.rtt;
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}
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static const struct cpuinfo_data arc_cpu_tbl[] = {
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#ifdef CONFIG_ISA_ARCOMPACT
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{ {0x20, "ARC 600" }, 0x2F},
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{ {0x30, "ARC 700" }, 0x33},
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{ {0x34, "ARC 700 R4.10"}, 0x34},
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{ {0x35, "ARC 700 R4.11"}, 0x35},
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#else
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{ {0x50, "ARC HS38 R2.0"}, 0x51},
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{ {0x52, "ARC HS38 R2.1"}, 0x52},
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#endif
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{ {0x00, NULL } }
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};
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static char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len)
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{
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struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
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struct bcr_identity *core = &cpu->core;
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const struct cpuinfo_data *tbl;
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char *isa_nm;
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int i, be, atomic;
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int n = 0;
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FIX_PTR(cpu);
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if (is_isa_arcompact()) {
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isa_nm = "ARCompact";
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be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN);
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atomic = cpu->isa.atomic1;
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if (!cpu->isa.ver) /* ISA BCR absent, use Kconfig info */
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atomic = IS_ENABLED(CONFIG_ARC_HAS_LLSC);
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} else {
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isa_nm = "ARCv2";
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be = cpu->isa.be;
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atomic = cpu->isa.atomic;
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}
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n += scnprintf(buf + n, len - n,
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"\nIDENTITY\t: ARCVER [%#02x] ARCNUM [%#02x] CHIPID [%#4x]\n",
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core->family, core->cpu_id, core->chip_id);
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for (tbl = &arc_cpu_tbl[0]; tbl->info.id != 0; tbl++) {
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if ((core->family >= tbl->info.id) &&
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(core->family <= tbl->up_range)) {
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n += scnprintf(buf + n, len - n,
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"processor [%d]\t: %s (%s ISA) %s\n",
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cpu_id, tbl->info.str, isa_nm,
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IS_AVAIL1(be, "[Big-Endian]"));
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break;
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}
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}
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if (tbl->info.id == 0)
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n += scnprintf(buf + n, len - n, "UNKNOWN ARC Processor\n");
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n += scnprintf(buf + n, len - n, "Timers\t\t: %s%s%s%s\nISA Extn\t: ",
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IS_AVAIL1(cpu->extn.timer0, "Timer0 "),
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IS_AVAIL1(cpu->extn.timer1, "Timer1 "),
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IS_AVAIL2(cpu->extn.rtc, "Local-64-bit-Ctr ",
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CONFIG_ARC_HAS_RTC));
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n += i = scnprintf(buf + n, len - n, "%s%s%s%s%s",
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IS_AVAIL2(atomic, "atomic ", CONFIG_ARC_HAS_LLSC),
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IS_AVAIL2(cpu->isa.ldd, "ll64 ", CONFIG_ARC_HAS_LL64),
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IS_AVAIL1(cpu->isa.unalign, "unalign (not used)"));
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if (i)
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n += scnprintf(buf + n, len - n, "\n\t\t: ");
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if (cpu->extn_mpy.ver) {
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if (cpu->extn_mpy.ver <= 0x2) { /* ARCompact */
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n += scnprintf(buf + n, len - n, "mpy ");
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} else {
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int opt = 2; /* stock MPY/MPYH */
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if (cpu->extn_mpy.dsp) /* OPT 7-9 */
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opt = cpu->extn_mpy.dsp + 6;
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n += scnprintf(buf + n, len - n, "mpy[opt %d] ", opt);
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}
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}
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n += scnprintf(buf + n, len - n, "%s%s%s%s%s%s%s%s\n",
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IS_AVAIL1(cpu->isa.div_rem, "div_rem "),
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IS_AVAIL1(cpu->extn.norm, "norm "),
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IS_AVAIL1(cpu->extn.barrel, "barrel-shift "),
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IS_AVAIL1(cpu->extn.swap, "swap "),
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IS_AVAIL1(cpu->extn.minmax, "minmax "),
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IS_AVAIL1(cpu->extn.crc, "crc "),
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IS_AVAIL2(1, "swape", CONFIG_ARC_HAS_SWAPE));
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if (cpu->bpu.ver)
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n += scnprintf(buf + n, len - n,
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"BPU\t\t: %s%s match, cache:%d, Predict Table:%d\n",
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IS_AVAIL1(cpu->bpu.full, "full"),
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IS_AVAIL1(!cpu->bpu.full, "partial"),
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cpu->bpu.num_cache, cpu->bpu.num_pred);
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return buf;
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}
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static char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len)
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{
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int n = 0;
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struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
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FIX_PTR(cpu);
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n += scnprintf(buf + n, len - n,
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"Vector Table\t: %#x\nUncached Base\t: %#lx\n",
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cpu->vec_base, perip_base);
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if (cpu->extn.fpu_sp || cpu->extn.fpu_dp)
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n += scnprintf(buf + n, len - n, "FPU\t\t: %s%s\n",
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IS_AVAIL1(cpu->extn.fpu_sp, "SP "),
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IS_AVAIL1(cpu->extn.fpu_dp, "DP "));
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if (cpu->extn.debug)
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n += scnprintf(buf + n, len - n, "DEBUG\t\t: %s%s%s\n",
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IS_AVAIL1(cpu->extn.ap, "ActionPoint "),
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IS_AVAIL1(cpu->extn.smart, "smaRT "),
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IS_AVAIL1(cpu->extn.rtt, "RTT "));
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if (cpu->dccm.sz || cpu->iccm.sz)
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n += scnprintf(buf + n, len - n, "Extn [CCM]\t: DCCM @ %x, %d KB / ICCM: @ %x, %d KB\n",
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cpu->dccm.base_addr, TO_KB(cpu->dccm.sz),
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cpu->iccm.base_addr, TO_KB(cpu->iccm.sz));
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n += scnprintf(buf + n, len - n,
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"OS ABI [v3]\t: no-legacy-syscalls\n");
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return buf;
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}
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static void arc_chk_core_config(void)
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{
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struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
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int fpu_enabled;
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if (!cpu->extn.timer0)
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panic("Timer0 is not present!\n");
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if (!cpu->extn.timer1)
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panic("Timer1 is not present!\n");
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#ifdef CONFIG_ARC_HAS_DCCM
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/*
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* DCCM can be arbit placed in hardware.
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* Make sure it's placement/sz matches what Linux is built with
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*/
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if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr)
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panic("Linux built with incorrect DCCM Base address\n");
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if (CONFIG_ARC_DCCM_SZ != cpu->dccm.sz)
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panic("Linux built with incorrect DCCM Size\n");
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#endif
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#ifdef CONFIG_ARC_HAS_ICCM
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if (CONFIG_ARC_ICCM_SZ != cpu->iccm.sz)
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panic("Linux built with incorrect ICCM Size\n");
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#endif
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/*
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* FP hardware/software config sanity
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* -If hardware contains DPFP, kernel needs to save/restore FPU state
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* -If not, it will crash trying to save/restore the non-existant regs
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*
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* (only DPDP checked since SP has no arch visible regs)
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*/
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fpu_enabled = IS_ENABLED(CONFIG_ARC_FPU_SAVE_RESTORE);
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if (cpu->extn.fpu_dp && !fpu_enabled)
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pr_warn("CONFIG_ARC_FPU_SAVE_RESTORE needed for working apps\n");
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else if (!cpu->extn.fpu_dp && fpu_enabled)
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panic("FPU non-existent, disable CONFIG_ARC_FPU_SAVE_RESTORE\n");
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}
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/*
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* Initialize and setup the processor core
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* This is called by all the CPUs thus should not do special case stuff
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* such as only for boot CPU etc
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*/
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void setup_processor(void)
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{
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char str[512];
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int cpu_id = smp_processor_id();
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read_arc_build_cfg_regs();
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arc_init_IRQ();
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printk(arc_cpu_mumbojumbo(cpu_id, str, sizeof(str)));
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arc_mmu_init();
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arc_cache_init();
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printk(arc_extn_mumbojumbo(cpu_id, str, sizeof(str)));
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printk(arc_platform_smp_cpuinfo());
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arc_chk_core_config();
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}
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static inline int is_kernel(unsigned long addr)
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{
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if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end)
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return 1;
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return 0;
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}
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void __init setup_arch(char **cmdline_p)
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{
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#ifdef CONFIG_ARC_UBOOT_SUPPORT
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/* make sure that uboot passed pointer to cmdline/dtb is valid */
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if (uboot_tag && is_kernel((unsigned long)uboot_arg))
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panic("Invalid uboot arg\n");
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/* See if u-boot passed an external Device Tree blob */
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machine_desc = setup_machine_fdt(uboot_arg); /* uboot_tag == 2 */
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if (!machine_desc)
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#endif
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{
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/* No, so try the embedded one */
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machine_desc = setup_machine_fdt(__dtb_start);
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if (!machine_desc)
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panic("Embedded DT invalid\n");
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/*
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* If we are here, it is established that @uboot_arg didn't
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* point to DT blob. Instead if u-boot says it is cmdline,
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* append to embedded DT cmdline.
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* setup_machine_fdt() would have populated @boot_command_line
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*/
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if (uboot_tag == 1) {
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/* Ensure a whitespace between the 2 cmdlines */
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strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
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strlcat(boot_command_line, uboot_arg,
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COMMAND_LINE_SIZE);
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}
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}
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/* Save unparsed command line copy for /proc/cmdline */
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*cmdline_p = boot_command_line;
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/* To force early parsing of things like mem=xxx */
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parse_early_param();
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/* Platform/board specific: e.g. early console registration */
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if (machine_desc->init_early)
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machine_desc->init_early();
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smp_init_cpus();
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setup_processor();
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setup_arch_memory();
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/* copy flat DT out of .init and then unflatten it */
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unflatten_and_copy_device_tree();
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/* Can be issue if someone passes cmd line arg "ro"
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* But that is unlikely so keeping it as it is
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*/
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root_mountflags &= ~MS_RDONLY;
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#if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
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conswitchp = &dummy_con;
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#endif
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arc_unwind_init();
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}
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static int __init customize_machine(void)
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{
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/*
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* Traverses flattened DeviceTree - registering platform devices
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* (if any) complete with their resources
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*/
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of_platform_default_populate(NULL, NULL, NULL);
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if (machine_desc->init_machine)
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machine_desc->init_machine();
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return 0;
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}
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arch_initcall(customize_machine);
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static int __init init_late_machine(void)
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{
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if (machine_desc->init_late)
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machine_desc->init_late();
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return 0;
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}
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late_initcall(init_late_machine);
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/*
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* Get CPU information for use by the procfs.
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*/
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#define cpu_to_ptr(c) ((void *)(0xFFFF0000 | (unsigned int)(c)))
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#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)
|
|
goto done;
|
|
|
|
seq_printf(m, arc_cpu_mumbojumbo(cpu_id, str, PAGE_SIZE));
|
|
|
|
of_property_read_u32(core_clk, "clock-frequency", &freq);
|
|
if (freq)
|
|
seq_printf(m, "CPU speed\t: %u.%02u Mhz\n",
|
|
freq / 1000000, (freq / 10000) % 100);
|
|
|
|
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);
|