Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / arch / arc / kernel / setup.c
diff --git a/kernel/arch/arc/kernel/setup.c b/kernel/arch/arc/kernel/setup.c
new file mode 100644 (file)
index 0000000..1d167c6
--- /dev/null
@@ -0,0 +1,485 @@
+/*
+ * 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);