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linux-stable/arch/arc/kernel/setup.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*/
#include <linux/seq_file.h>
#include <linux/fs.h>
#include <linux/delay.h>
#include <linux/root_dev.h>
#include <linux/clk.h>
#include <linux/clocksource.h>
#include <linux/console.h>
#include <linux/module.h>
#include <linux/sizes.h>
#include <linux/cpu.h>
#include <linux/of_clk.h>
#include <linux/of_fdt.h>
#include <linux/of.h>
#include <linux/cache.h>
#include <uapi/linux/mount.h>
#include <asm/sections.h>
#include <asm/arcregs.h>
#include <asm/asserts.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>
#include <asm/dsp-impl.h>
#include <soc/arc/mcip.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;
int __initdata uboot_magic;
char __initdata *uboot_arg;
const struct machine_desc *machine_desc;
struct task_struct *_current_task[NR_CPUS]; /* For stack switching */
struct cpuinfo_arc {
int arcver;
unsigned int t0:1, t1:1;
struct {
unsigned long base;
unsigned int sz;
} iccm, dccm;
};
#ifdef CONFIG_ISA_ARCV2
static const struct id_to_str arc_hs_rel[] = {
/* ID.ARCVER, Release */
{ 0x51, "R2.0" },
{ 0x52, "R2.1" },
{ 0x53, "R3.0" },
};
static const struct id_to_str arc_hs_ver54_rel[] = {
/* UARCH.MAJOR, Release */
{ 0, "R3.10a"},
{ 1, "R3.50a"},
{ 2, "R3.60a"},
{ 3, "R4.00a"},
{ 0xFF, NULL }
};
#endif
static int
arcompact_mumbojumbo(int c, struct cpuinfo_arc *info, char *buf, int len)
{
int n = 0;
#ifdef CONFIG_ISA_ARCOMPACT
char *cpu_nm, *isa_nm = "ARCompact";
struct bcr_fp_arcompact fpu_sp, fpu_dp;
int atomic = 0, be, present;
int bpu_full, bpu_cache, bpu_pred;
struct bcr_bpu_arcompact bpu;
struct bcr_iccm_arcompact iccm;
struct bcr_dccm_arcompact dccm;
struct bcr_generic isa;
READ_BCR(ARC_REG_ISA_CFG_BCR, isa);
if (!isa.ver) /* ISA BCR absent, use Kconfig info */
atomic = IS_ENABLED(CONFIG_ARC_HAS_LLSC);
else {
/* ARC700_BUILD only has 2 bits of isa info */
atomic = isa.info & 1;
}
be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN);
if (info->arcver < 0x34)
cpu_nm = "ARC750";
else
cpu_nm = "ARC770";
n += scnprintf(buf + n, len - n, "processor [%d]\t: %s (%s ISA) %s%s%s\n",
c, cpu_nm, isa_nm,
IS_AVAIL2(atomic, "atomic ", CONFIG_ARC_HAS_LLSC),
IS_AVAIL1(be, "[Big-Endian]"));
READ_BCR(ARC_REG_FP_BCR, fpu_sp);
READ_BCR(ARC_REG_DPFP_BCR, fpu_dp);
if (fpu_sp.ver | fpu_dp.ver)
n += scnprintf(buf + n, len - n, "FPU\t\t: %s%s\n",
IS_AVAIL1(fpu_sp.ver, "SP "),
IS_AVAIL1(fpu_dp.ver, "DP "));
READ_BCR(ARC_REG_BPU_BCR, bpu);
bpu_full = bpu.fam ? 1 : 0;
bpu_cache = 256 << (bpu.ent - 1);
bpu_pred = 256 << (bpu.ent - 1);
n += scnprintf(buf + n, len - n,
"BPU\t\t: %s%s match, cache:%d, Predict Table:%d\n",
IS_AVAIL1(bpu_full, "full"),
IS_AVAIL1(!bpu_full, "partial"),
bpu_cache, bpu_pred);
READ_BCR(ARC_REG_ICCM_BUILD, iccm);
if (iccm.ver) {
info->iccm.sz = 4096 << iccm.sz; /* 8K to 512K */
info->iccm.base = iccm.base << 16;
}
READ_BCR(ARC_REG_DCCM_BUILD, dccm);
if (dccm.ver) {
unsigned long base;
info->dccm.sz = 2048 << dccm.sz; /* 2K to 256K */
base = read_aux_reg(ARC_REG_DCCM_BASE_BUILD);
info->dccm.base = base & ~0xF;
}
/* ARCompact ISA specific sanity checks */
present = fpu_dp.ver; /* SP has no arch visible regs */
CHK_OPT_STRICT(CONFIG_ARC_FPU_SAVE_RESTORE, present);
#endif
return n;
}
static int arcv2_mumbojumbo(int c, struct cpuinfo_arc *info, char *buf, int len)
{
int n = 0;
#ifdef CONFIG_ISA_ARCV2
const char *release = "", *cpu_nm = "HS38", *isa_nm = "ARCv2";
int dual_issue = 0, dual_enb = 0, mpy_opt, present;
int bpu_full, bpu_cache, bpu_pred, bpu_ret_stk;
char mpy_nm[16], lpb_nm[32];
struct bcr_isa_arcv2 isa;
struct bcr_mpy mpy;
struct bcr_fp_arcv2 fpu;
struct bcr_bpu_arcv2 bpu;
struct bcr_lpb lpb;
struct bcr_iccm_arcv2 iccm;
struct bcr_dccm_arcv2 dccm;
struct bcr_erp erp;
/*
* Initial HS cores bumped AUX IDENTITY.ARCVER for each release until
* ARCVER 0x54 which introduced AUX MICRO_ARCH_BUILD and subsequent
* releases only update it.
*/
if (info->arcver > 0x50 && info->arcver <= 0x53) {
release = arc_hs_rel[info->arcver - 0x51].str;
} else {
const struct id_to_str *tbl;
struct bcr_uarch_build uarch;
READ_BCR(ARC_REG_MICRO_ARCH_BCR, uarch);
for (tbl = &arc_hs_ver54_rel[0]; tbl->id != 0xFF; tbl++) {
if (uarch.maj == tbl->id) {
release = tbl->str;
break;
}
}
if (uarch.prod == 4) {
unsigned int exec_ctrl;
cpu_nm = "HS48";
dual_issue = 1;
/* if dual issue hardware, is it enabled ? */
READ_BCR(AUX_EXEC_CTRL, exec_ctrl);
dual_enb = !(exec_ctrl & 1);
}
}
READ_BCR(ARC_REG_ISA_CFG_BCR, isa);
n += scnprintf(buf + n, len - n, "processor [%d]\t: %s %s (%s ISA) %s%s%s\n",
c, cpu_nm, release, isa_nm,
IS_AVAIL1(isa.be, "[Big-Endian]"),
IS_AVAIL3(dual_issue, dual_enb, " Dual-Issue "));
READ_BCR(ARC_REG_MPY_BCR, mpy);
mpy_opt = 2; /* stock MPY/MPYH */
if (mpy.dsp) /* OPT 7-9 */
mpy_opt = mpy.dsp + 6;
scnprintf(mpy_nm, 16, "mpy[opt %d] ", mpy_opt);
READ_BCR(ARC_REG_FP_V2_BCR, fpu);
n += scnprintf(buf + n, len - n, "ISA Extn\t: %s%s%s%s%s%s%s%s%s%s%s\n",
IS_AVAIL2(isa.atomic, "atomic ", CONFIG_ARC_HAS_LLSC),
IS_AVAIL2(isa.ldd, "ll64 ", CONFIG_ARC_HAS_LL64),
IS_AVAIL2(isa.unalign, "unalign ", CONFIG_ARC_USE_UNALIGNED_MEM_ACCESS),
IS_AVAIL1(mpy.ver, mpy_nm),
IS_AVAIL1(isa.div_rem, "div_rem "),
IS_AVAIL1((fpu.sp | fpu.dp), " FPU:"),
IS_AVAIL1(fpu.sp, " sp"),
IS_AVAIL1(fpu.dp, " dp"));
READ_BCR(ARC_REG_BPU_BCR, bpu);
bpu_full = bpu.ft;
bpu_cache = 256 << bpu.bce;
bpu_pred = 2048 << bpu.pte;
bpu_ret_stk = 4 << bpu.rse;
READ_BCR(ARC_REG_LPB_BUILD, lpb);
if (lpb.ver) {
unsigned int ctl;
ctl = read_aux_reg(ARC_REG_LPB_CTRL);
scnprintf(lpb_nm, sizeof(lpb_nm), " Loop Buffer:%d %s",
lpb.entries, IS_DISABLED_RUN(!ctl));
}
n += scnprintf(buf + n, len - n,
"BPU\t\t: %s%s match, cache:%d, Predict Table:%d Return stk: %d%s\n",
IS_AVAIL1(bpu_full, "full"),
IS_AVAIL1(!bpu_full, "partial"),
bpu_cache, bpu_pred, bpu_ret_stk,
lpb_nm);
READ_BCR(ARC_REG_ICCM_BUILD, iccm);
if (iccm.ver) {
unsigned long base;
info->iccm.sz = 256 << iccm.sz00; /* 512B to 16M */
if (iccm.sz00 == 0xF && iccm.sz01 > 0)
info->iccm.sz <<= iccm.sz01;
base = read_aux_reg(ARC_REG_AUX_ICCM);
info->iccm.base = base & 0xF0000000;
}
READ_BCR(ARC_REG_DCCM_BUILD, dccm);
if (dccm.ver) {
unsigned long base;
info->dccm.sz = 256 << dccm.sz0;
if (dccm.sz0 == 0xF && dccm.sz1 > 0)
info->dccm.sz <<= dccm.sz1;
base = read_aux_reg(ARC_REG_AUX_DCCM);
info->dccm.base = base & 0xF0000000;
}
/* Error Protection: ECC/Parity */
READ_BCR(ARC_REG_ERP_BUILD, erp);
if (erp.ver) {
struct ctl_erp ctl;
READ_BCR(ARC_REG_ERP_CTRL, ctl);
/* inverted bits: 0 means enabled */
n += scnprintf(buf + n, len - n, "Extn [ECC]\t: %s%s%s%s%s%s\n",
IS_AVAIL3(erp.ic, !ctl.dpi, "IC "),
IS_AVAIL3(erp.dc, !ctl.dpd, "DC "),
IS_AVAIL3(erp.mmu, !ctl.mpd, "MMU "));
}
/* ARCv2 ISA specific sanity checks */
present = fpu.sp | fpu.dp | mpy.dsp; /* DSP and/or FPU */
CHK_OPT_STRICT(CONFIG_ARC_HAS_ACCL_REGS, present);
dsp_config_check();
#endif
return n;
}
static char *arc_cpu_mumbojumbo(int c, struct cpuinfo_arc *info, char *buf, int len)
{
struct bcr_identity ident;
struct bcr_timer timer;
struct bcr_generic bcr;
struct mcip_bcr mp;
struct bcr_actionpoint ap;
unsigned long vec_base;
int ap_num, ap_full, smart, rtt, n;
memset(info, 0, sizeof(struct cpuinfo_arc));
READ_BCR(AUX_IDENTITY, ident);
info->arcver = ident.family;
n = scnprintf(buf, len,
"\nIDENTITY\t: ARCVER [%#02x] ARCNUM [%#02x] CHIPID [%#4x]\n",
ident.family, ident.cpu_id, ident.chip_id);
if (is_isa_arcompact()) {
n += arcompact_mumbojumbo(c, info, buf + n, len - n);
} else if (is_isa_arcv2()){
n += arcv2_mumbojumbo(c, info, buf + n, len - n);
}
n += arc_mmu_mumbojumbo(c, buf + n, len - n);
n += arc_cache_mumbojumbo(c, buf + n, len - n);
READ_BCR(ARC_REG_TIMERS_BCR, timer);
info->t0 = timer.t0;
info->t1 = timer.t1;
READ_BCR(ARC_REG_MCIP_BCR, mp);
vec_base = read_aux_reg(AUX_INTR_VEC_BASE);
n += scnprintf(buf + n, len - n,
"Timers\t\t: %s%s%s%s%s%s\nVector Table\t: %#lx\n",
IS_AVAIL1(timer.t0, "Timer0 "),
IS_AVAIL1(timer.t1, "Timer1 "),
IS_AVAIL2(timer.rtc, "RTC [UP 64-bit] ", CONFIG_ARC_TIMERS_64BIT),
IS_AVAIL2(mp.gfrc, "GFRC [SMP 64-bit] ", CONFIG_ARC_TIMERS_64BIT),
vec_base);
READ_BCR(ARC_REG_AP_BCR, ap);
if (ap.ver) {
ap_num = 2 << ap.num;
ap_full = !ap.min;
}
READ_BCR(ARC_REG_SMART_BCR, bcr);
smart = bcr.ver ? 1 : 0;
READ_BCR(ARC_REG_RTT_BCR, bcr);
rtt = bcr.ver ? 1 : 0;
if (ap.ver | smart | rtt) {
n += scnprintf(buf + n, len - n, "DEBUG\t\t: %s%s",
IS_AVAIL1(smart, "smaRT "),
IS_AVAIL1(rtt, "RTT "));
if (ap.ver) {
n += scnprintf(buf + n, len - n, "ActionPoint %d/%s",
ap_num,
ap_full ? "full":"min");
}
n += scnprintf(buf + n, len - n, "\n");
}
if (info->dccm.sz || info->iccm.sz)
n += scnprintf(buf + n, len - n,
"Extn [CCM]\t: DCCM @ %lx, %d KB / ICCM: @ %lx, %d KB\n",
info->dccm.base, TO_KB(info->dccm.sz),
info->iccm.base, TO_KB(info->iccm.sz));
return buf;
}
void chk_opt_strict(char *opt_name, bool hw_exists, bool opt_ena)
{
if (hw_exists && !opt_ena)
pr_warn(" ! Enable %s for working apps\n", opt_name);
else if (!hw_exists && opt_ena)
panic("Disable %s, hardware NOT present\n", opt_name);
}
void chk_opt_weak(char *opt_name, bool hw_exists, bool opt_ena)
{
if (!hw_exists && opt_ena)
panic("Disable %s, hardware NOT present\n", opt_name);
}
/*
* ISA agnostic sanity checks
*/
static void arc_chk_core_config(struct cpuinfo_arc *info)
{
if (!info->t0)
panic("Timer0 is not present!\n");
if (!info->t1)
panic("Timer1 is not present!\n");
#ifdef CONFIG_ARC_HAS_DCCM
/*
* DCCM can be arbit placed in hardware.
* Make sure its placement/sz matches what Linux is built with
*/
if ((unsigned int)__arc_dccm_base != info->dccm.base)
panic("Linux built with incorrect DCCM Base address\n");
if (CONFIG_ARC_DCCM_SZ * SZ_1K != info->dccm.sz)
panic("Linux built with incorrect DCCM Size\n");
#endif
#ifdef CONFIG_ARC_HAS_ICCM
if (CONFIG_ARC_ICCM_SZ * SZ_1K != info->iccm.sz)
panic("Linux built with incorrect ICCM Size\n");
#endif
}
/*
* 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)
{
struct cpuinfo_arc info;
int c = smp_processor_id();
char str[512];
pr_info("%s", arc_cpu_mumbojumbo(c, &info, str, sizeof(str)));
pr_info("%s", arc_platform_smp_cpuinfo());
arc_chk_core_config(&info);
arc_init_IRQ();
arc_mmu_init();
arc_cache_init();
}
static inline bool uboot_arg_invalid(unsigned long addr)
{
/*
* Check that it is a untranslated address (although MMU is not enabled
* yet, it being a high address ensures this is not by fluke)
*/
if (addr < PAGE_OFFSET)
return true;
/* Check that address doesn't clobber resident kernel image */
return addr >= (unsigned long)_stext && addr <= (unsigned long)_end;
}
#define IGNORE_ARGS "Ignore U-boot args: "
/* uboot_tag values for U-boot - kernel ABI revision 0; see head.S */
#define UBOOT_TAG_NONE 0
#define UBOOT_TAG_CMDLINE 1
#define UBOOT_TAG_DTB 2
/* We always pass 0 as magic from U-boot */
#define UBOOT_MAGIC_VALUE 0
void __init handle_uboot_args(void)
{
bool use_embedded_dtb = true;
bool append_cmdline = false;
/* check that we know this tag */
if (uboot_tag != UBOOT_TAG_NONE &&
uboot_tag != UBOOT_TAG_CMDLINE &&
uboot_tag != UBOOT_TAG_DTB) {
pr_warn(IGNORE_ARGS "invalid uboot tag: '%08x'\n", uboot_tag);
goto ignore_uboot_args;
}
if (uboot_magic != UBOOT_MAGIC_VALUE) {
pr_warn(IGNORE_ARGS "non zero uboot magic\n");
goto ignore_uboot_args;
}
if (uboot_tag != UBOOT_TAG_NONE &&
uboot_arg_invalid((unsigned long)uboot_arg)) {
pr_warn(IGNORE_ARGS "invalid uboot arg: '%px'\n", uboot_arg);
goto ignore_uboot_args;
}
/* see if U-boot passed an external Device Tree blob */
if (uboot_tag == UBOOT_TAG_DTB) {
machine_desc = setup_machine_fdt((void *)uboot_arg);
/* external Device Tree blob is invalid - use embedded one */
use_embedded_dtb = !machine_desc;
}
if (uboot_tag == UBOOT_TAG_CMDLINE)
append_cmdline = true;
ignore_uboot_args:
if (use_embedded_dtb) {
machine_desc = setup_machine_fdt(__dtb_start);
if (!machine_desc)
panic("Embedded DT invalid\n");
}
/*
* NOTE: @boot_command_line is populated by setup_machine_fdt() so this
* append processing can only happen after.
*/
if (append_cmdline) {
/* Ensure a whitespace between the 2 cmdlines */
strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
strlcat(boot_command_line, uboot_arg, COMMAND_LINE_SIZE);
}
}
void __init setup_arch(char **cmdline_p)
{
handle_uboot_args();
/* 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;
arc_unwind_init();
}
/*
* Called from start_kernel() - boot CPU only
*/
void __init time_init(void)
{
of_clk_init(NULL);
timer_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 *cpu_dev = get_cpu_device(cpu_id);
struct cpuinfo_arc info;
struct clk *cpu_clk;
unsigned long 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_KERNEL);
if (!str)
goto done;
seq_printf(m, arc_cpu_mumbojumbo(cpu_id, &info, str, PAGE_SIZE));
cpu_clk = clk_get(cpu_dev, NULL);
if (IS_ERR(cpu_clk)) {
seq_printf(m, "CPU speed \t: Cannot get clock for processor [%d]\n",
cpu_id);
} else {
freq = clk_get_rate(cpu_clk);
}
if (freq)
seq_printf(m, "CPU speed\t: %lu.%02lu 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_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 < nr_cpu_ids ? 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);
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