2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
9 #include <linux/seq_file.h>
11 #include <linux/delay.h>
12 #include <linux/root_dev.h>
13 #include <linux/console.h>
14 #include <linux/module.h>
15 #include <linux/cpu.h>
16 #include <linux/clk-provider.h>
17 #include <linux/of_fdt.h>
18 #include <linux/of_platform.h>
19 #include <linux/cache.h>
20 #include <asm/sections.h>
21 #include <asm/arcregs.h>
23 #include <asm/setup.h>
26 #include <asm/unwind.h>
28 #include <asm/mach_desc.h>
31 #define FIX_PTR(x) __asm__ __volatile__(";" : "+r"(x))
33 /* Part of U-boot ABI: see head.S */
34 int __initdata uboot_tag;
35 char __initdata *uboot_arg;
37 const struct machine_desc *machine_desc;
39 struct task_struct *_current_task[NR_CPUS]; /* For stack switching */
41 struct cpuinfo_arc cpuinfo_arc700[NR_CPUS];
43 static void read_arc_build_cfg_regs(void)
45 struct bcr_perip uncached_space;
46 struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
49 READ_BCR(AUX_IDENTITY, cpu->core);
51 cpu->timers = read_aux_reg(ARC_REG_TIMERS_BCR);
52 cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE);
54 READ_BCR(ARC_REG_D_UNCACH_BCR, uncached_space);
55 cpu->uncached_base = uncached_space.start << 24;
57 cpu->extn.mul = read_aux_reg(ARC_REG_MUL_BCR);
58 cpu->extn.swap = read_aux_reg(ARC_REG_SWAP_BCR);
59 cpu->extn.norm = read_aux_reg(ARC_REG_NORM_BCR);
60 cpu->extn.minmax = read_aux_reg(ARC_REG_MIXMAX_BCR);
61 cpu->extn.barrel = read_aux_reg(ARC_REG_BARREL_BCR);
62 READ_BCR(ARC_REG_MAC_BCR, cpu->extn_mac_mul);
64 cpu->extn.ext_arith = read_aux_reg(ARC_REG_EXTARITH_BCR);
65 cpu->extn.crc = read_aux_reg(ARC_REG_CRC_BCR);
67 /* Note that we read the CCM BCRs independent of kernel config
68 * This is to catch the cases where user doesn't know that
69 * CCMs are present in hardware build
74 struct bcr_dccm_base dccm_base;
75 unsigned int bcr_32bit_val;
77 bcr_32bit_val = read_aux_reg(ARC_REG_ICCM_BCR);
79 iccm = *((struct bcr_iccm *)&bcr_32bit_val);
80 cpu->iccm.base_addr = iccm.base << 16;
81 cpu->iccm.sz = 0x2000 << (iccm.sz - 1);
84 bcr_32bit_val = read_aux_reg(ARC_REG_DCCM_BCR);
86 dccm = *((struct bcr_dccm *)&bcr_32bit_val);
87 cpu->dccm.sz = 0x800 << (dccm.sz);
89 READ_BCR(ARC_REG_DCCMBASE_BCR, dccm_base);
90 cpu->dccm.base_addr = dccm_base.addr << 8;
94 READ_BCR(ARC_REG_XY_MEM_BCR, cpu->extn_xymem);
96 read_decode_mmu_bcr();
97 read_decode_cache_bcr();
99 READ_BCR(ARC_REG_FP_BCR, cpu->fp);
100 READ_BCR(ARC_REG_DPFP_BCR, cpu->dpfp);
103 static const struct cpuinfo_data arc_cpu_tbl[] = {
104 { {0x10, "ARCTangent A5"}, 0x1F},
105 { {0x20, "ARC 600" }, 0x2F},
106 { {0x30, "ARC 700" }, 0x33},
107 { {0x34, "ARC 700 R4.10"}, 0x34},
111 static char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len)
114 struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
115 struct bcr_identity *core = &cpu->core;
116 const struct cpuinfo_data *tbl;
118 #ifdef CONFIG_CPU_BIG_ENDIAN
123 n += scnprintf(buf + n, len - n,
124 "\nARC IDENTITY\t: Family [%#02x]"
125 " Cpu-id [%#02x] Chip-id [%#4x]\n",
126 core->family, core->cpu_id,
129 for (tbl = &arc_cpu_tbl[0]; tbl->info.id != 0; tbl++) {
130 if ((core->family >= tbl->info.id) &&
131 (core->family <= tbl->up_range)) {
132 n += scnprintf(buf + n, len - n,
133 "processor\t: %s %s\n",
135 be ? "[Big Endian]" : "");
140 if (tbl->info.id == 0)
141 n += scnprintf(buf + n, len - n, "UNKNOWN ARC Processor\n");
143 n += scnprintf(buf + n, len - n, "CPU speed\t: %u.%02u Mhz\n",
144 (unsigned int)(arc_get_core_freq() / 1000000),
145 (unsigned int)(arc_get_core_freq() / 10000) % 100);
147 n += scnprintf(buf + n, len - n, "Timers\t\t: %s %s\n",
148 (cpu->timers & 0x200) ? "TIMER1" : "",
149 (cpu->timers & 0x100) ? "TIMER0" : "");
151 n += scnprintf(buf + n, len - n, "Vect Tbl Base\t: %#x\n",
154 n += scnprintf(buf + n, len - n, "UNCACHED Base\t: %#x\n",
160 static const struct id_to_str mul_type_nm[] = {
162 { 0x1, "32x32 (spl Result Reg)" },
163 { 0x2, "32x32 (ANY Result Reg)" }
166 static const struct id_to_str mac_mul_nm[] = {
169 {0x2, "Dual 16 x 16"},
173 {0x6, "Dual 16x16 and 32x16"}
176 static char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len)
179 struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
182 #define IS_AVAIL1(var, str) ((var) ? str : "")
183 #define IS_AVAIL2(var, str) ((var == 0x2) ? str : "")
184 #define IS_USED(cfg) (IS_ENABLED(cfg) ? "(in-use)" : "(not used)")
186 n += scnprintf(buf + n, len - n,
187 "Extn [700-Base]\t: %s %s %s %s %s %s\n",
188 IS_AVAIL2(cpu->extn.norm, "norm,"),
189 IS_AVAIL2(cpu->extn.barrel, "barrel-shift,"),
190 IS_AVAIL1(cpu->extn.swap, "swap,"),
191 IS_AVAIL2(cpu->extn.minmax, "minmax,"),
192 IS_AVAIL1(cpu->extn.crc, "crc,"),
193 IS_AVAIL2(cpu->extn.ext_arith, "ext-arith"));
195 n += scnprintf(buf + n, len - n, "Extn [700-MPY]\t: %s",
196 mul_type_nm[cpu->extn.mul].str);
198 n += scnprintf(buf + n, len - n, " MAC MPY: %s\n",
199 mac_mul_nm[cpu->extn_mac_mul.type].str);
201 if (cpu->core.family == 0x34) {
202 n += scnprintf(buf + n, len - n,
203 "Extn [700-4.10]\t: LLOCK/SCOND %s, SWAPE %s, RTSC %s\n",
204 IS_USED(CONFIG_ARC_HAS_LLSC),
205 IS_USED(CONFIG_ARC_HAS_SWAPE),
206 IS_USED(CONFIG_ARC_HAS_RTSC));
209 n += scnprintf(buf + n, len - n, "Extn [CCM]\t: %s",
210 !(cpu->dccm.sz || cpu->iccm.sz) ? "N/A" : "");
213 n += scnprintf(buf + n, len - n, "DCCM: @ %x, %d KB ",
214 cpu->dccm.base_addr, TO_KB(cpu->dccm.sz));
217 n += scnprintf(buf + n, len - n, "ICCM: @ %x, %d KB",
218 cpu->iccm.base_addr, TO_KB(cpu->iccm.sz));
220 n += scnprintf(buf + n, len - n, "\nExtn [FPU]\t: %s",
221 !(cpu->fp.ver || cpu->dpfp.ver) ? "N/A" : "");
224 n += scnprintf(buf + n, len - n, "SP [v%d] %s",
225 cpu->fp.ver, cpu->fp.fast ? "(fast)" : "");
228 n += scnprintf(buf + n, len - n, "DP [v%d] %s",
229 cpu->dpfp.ver, cpu->dpfp.fast ? "(fast)" : "");
231 n += scnprintf(buf + n, len - n, "\n");
233 n += scnprintf(buf + n, len - n,
234 "OS ABI [v3]\t: no-legacy-syscalls\n");
239 static void arc_chk_core_config(void)
241 struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
244 #ifdef CONFIG_ARC_HAS_DCCM
246 * DCCM can be arbit placed in hardware.
247 * Make sure it's placement/sz matches what Linux is built with
249 if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr)
250 panic("Linux built with incorrect DCCM Base address\n");
252 if (CONFIG_ARC_DCCM_SZ != cpu->dccm.sz)
253 panic("Linux built with incorrect DCCM Size\n");
256 #ifdef CONFIG_ARC_HAS_ICCM
257 if (CONFIG_ARC_ICCM_SZ != cpu->iccm.sz)
258 panic("Linux built with incorrect ICCM Size\n");
262 * FP hardware/software config sanity
263 * -If hardware contains DPFP, kernel needs to save/restore FPU state
264 * -If not, it will crash trying to save/restore the non-existant regs
266 * (only DPDP checked since SP has no arch visible regs)
268 fpu_enabled = IS_ENABLED(CONFIG_ARC_FPU_SAVE_RESTORE);
270 if (cpu->dpfp.ver && !fpu_enabled)
271 pr_warn("CONFIG_ARC_FPU_SAVE_RESTORE needed for working apps\n");
272 else if (!cpu->dpfp.ver && fpu_enabled)
273 panic("FPU non-existent, disable CONFIG_ARC_FPU_SAVE_RESTORE\n");
277 * Initialize and setup the processor core
278 * This is called by all the CPUs thus should not do special case stuff
279 * such as only for boot CPU etc
282 void setup_processor(void)
285 int cpu_id = smp_processor_id();
287 read_arc_build_cfg_regs();
290 printk(arc_cpu_mumbojumbo(cpu_id, str, sizeof(str)));
295 printk(arc_extn_mumbojumbo(cpu_id, str, sizeof(str)));
296 printk(arc_platform_smp_cpuinfo());
298 arc_chk_core_config();
301 static inline int is_kernel(unsigned long addr)
303 if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end)
308 void __init setup_arch(char **cmdline_p)
310 /* make sure that uboot passed pointer to cmdline/dtb is valid */
311 if (uboot_tag && is_kernel((unsigned long)uboot_arg))
312 panic("Invalid uboot arg\n");
314 /* See if u-boot passed an external Device Tree blob */
315 machine_desc = setup_machine_fdt(uboot_arg); /* uboot_tag == 2 */
317 /* No, so try the embedded one */
318 machine_desc = setup_machine_fdt(__dtb_start);
320 panic("Embedded DT invalid\n");
323 * If we are here, it is established that @uboot_arg didn't
324 * point to DT blob. Instead if u-boot says it is cmdline,
325 * Appent to embedded DT cmdline.
326 * setup_machine_fdt() would have populated @boot_command_line
328 if (uboot_tag == 1) {
329 /* Ensure a whitespace between the 2 cmdlines */
330 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
331 strlcat(boot_command_line, uboot_arg,
336 /* Save unparsed command line copy for /proc/cmdline */
337 *cmdline_p = boot_command_line;
339 /* To force early parsing of things like mem=xxx */
342 /* Platform/board specific: e.g. early console registration */
343 if (machine_desc->init_early)
344 machine_desc->init_early();
350 /* copy flat DT out of .init and then unflatten it */
351 unflatten_and_copy_device_tree();
353 /* Can be issue if someone passes cmd line arg "ro"
354 * But that is unlikely so keeping it as it is
356 root_mountflags &= ~MS_RDONLY;
358 #if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
359 conswitchp = &dummy_con;
366 static int __init customize_machine(void)
370 * Traverses flattened DeviceTree - registering platform devices
371 * (if any) complete with their resources
373 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
375 if (machine_desc->init_machine)
376 machine_desc->init_machine();
380 arch_initcall(customize_machine);
382 static int __init init_late_machine(void)
384 if (machine_desc->init_late)
385 machine_desc->init_late();
389 late_initcall(init_late_machine);
391 * Get CPU information for use by the procfs.
394 #define cpu_to_ptr(c) ((void *)(0xFFFF0000 | (unsigned int)(c)))
395 #define ptr_to_cpu(p) (~0xFFFF0000UL & (unsigned int)(p))
397 static int show_cpuinfo(struct seq_file *m, void *v)
400 int cpu_id = ptr_to_cpu(v);
402 str = (char *)__get_free_page(GFP_TEMPORARY);
406 seq_printf(m, arc_cpu_mumbojumbo(cpu_id, str, PAGE_SIZE));
408 seq_printf(m, "Bogo MIPS : \t%lu.%02lu\n",
409 loops_per_jiffy / (500000 / HZ),
410 (loops_per_jiffy / (5000 / HZ)) % 100);
412 seq_printf(m, arc_mmu_mumbojumbo(cpu_id, str, PAGE_SIZE));
413 seq_printf(m, arc_cache_mumbojumbo(cpu_id, str, PAGE_SIZE));
414 seq_printf(m, arc_extn_mumbojumbo(cpu_id, str, PAGE_SIZE));
415 seq_printf(m, arc_platform_smp_cpuinfo());
417 free_page((unsigned long)str);
419 seq_printf(m, "\n\n");
424 static void *c_start(struct seq_file *m, loff_t *pos)
427 * Callback returns cpu-id to iterator for show routine, NULL to stop.
428 * However since NULL is also a valid cpu-id (0), we use a round-about
429 * way to pass it w/o having to kmalloc/free a 2 byte string.
430 * Encode cpu-id as 0xFFcccc, which is decoded by show routine.
432 return *pos < num_possible_cpus() ? cpu_to_ptr(*pos) : NULL;
435 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
438 return c_start(m, pos);
441 static void c_stop(struct seq_file *m, void *v)
445 const struct seq_operations cpuinfo_op = {
452 static DEFINE_PER_CPU(struct cpu, cpu_topology);
454 static int __init topology_init(void)
458 for_each_present_cpu(cpu)
459 register_cpu(&per_cpu(cpu_topology, cpu), cpu);
464 subsys_initcall(topology_init);