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/of_fdt.h>
18 #include <linux/cache.h>
19 #include <asm/sections.h>
20 #include <asm/arcregs.h>
22 #include <asm/setup.h>
25 #include <asm/unwind.h>
26 #include <asm/mach_desc.h>
29 #define FIX_PTR(x) __asm__ __volatile__(";" : "+r"(x))
31 unsigned int intr_to_DE_cnt
;
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 const struct cpuinfo_data arc_cpu_tbl
[] = {
44 #ifdef CONFIG_ISA_ARCOMPACT
45 { {0x20, "ARC 600" }, 0x2F},
46 { {0x30, "ARC 700" }, 0x33},
47 { {0x34, "ARC 700 R4.10"}, 0x34},
48 { {0x35, "ARC 700 R4.11"}, 0x35},
50 { {0x50, "ARC HS38 R2.0"}, 0x51},
51 { {0x52, "ARC HS38 R2.1"}, 0x52},
52 { {0x53, "ARC HS38 R3.0"}, 0x53},
57 static void read_decode_ccm_bcr(struct cpuinfo_arc
*cpu
)
59 if (is_isa_arcompact()) {
60 struct bcr_iccm_arcompact iccm
;
61 struct bcr_dccm_arcompact dccm
;
63 READ_BCR(ARC_REG_ICCM_BUILD
, iccm
);
65 cpu
->iccm
.sz
= 4096 << iccm
.sz
; /* 8K to 512K */
66 cpu
->iccm
.base_addr
= iccm
.base
<< 16;
69 READ_BCR(ARC_REG_DCCM_BUILD
, dccm
);
72 cpu
->dccm
.sz
= 2048 << dccm
.sz
; /* 2K to 256K */
74 base
= read_aux_reg(ARC_REG_DCCM_BASE_BUILD
);
75 cpu
->dccm
.base_addr
= base
& ~0xF;
78 struct bcr_iccm_arcv2 iccm
;
79 struct bcr_dccm_arcv2 dccm
;
82 READ_BCR(ARC_REG_ICCM_BUILD
, iccm
);
84 cpu
->iccm
.sz
= 256 << iccm
.sz00
; /* 512B to 16M */
85 if (iccm
.sz00
== 0xF && iccm
.sz01
> 0)
86 cpu
->iccm
.sz
<<= iccm
.sz01
;
88 region
= read_aux_reg(ARC_REG_AUX_ICCM
);
89 cpu
->iccm
.base_addr
= region
& 0xF0000000;
92 READ_BCR(ARC_REG_DCCM_BUILD
, dccm
);
94 cpu
->dccm
.sz
= 256 << dccm
.sz0
;
95 if (dccm
.sz0
== 0xF && dccm
.sz1
> 0)
96 cpu
->dccm
.sz
<<= dccm
.sz1
;
98 region
= read_aux_reg(ARC_REG_AUX_DCCM
);
99 cpu
->dccm
.base_addr
= region
& 0xF0000000;
104 static void read_arc_build_cfg_regs(void)
106 struct bcr_timer timer
;
107 struct bcr_generic bcr
;
108 struct cpuinfo_arc
*cpu
= &cpuinfo_arc700
[smp_processor_id()];
109 const struct cpuinfo_data
*tbl
;
113 READ_BCR(AUX_IDENTITY
, cpu
->core
);
114 READ_BCR(ARC_REG_ISA_CFG_BCR
, cpu
->isa
);
116 for (tbl
= &arc_cpu_tbl
[0]; tbl
->info
.id
!= 0; tbl
++) {
117 if ((cpu
->core
.family
>= tbl
->info
.id
) &&
118 (cpu
->core
.family
<= tbl
->up_range
)) {
119 cpu
->details
= tbl
->info
.str
;
124 if (tbl
->info
.id
== 0)
125 cpu
->details
= "UNKNOWN";
127 READ_BCR(ARC_REG_TIMERS_BCR
, timer
);
128 cpu
->extn
.timer0
= timer
.t0
;
129 cpu
->extn
.timer1
= timer
.t1
;
130 cpu
->extn
.rtc
= timer
.rtc
;
132 cpu
->vec_base
= read_aux_reg(AUX_INTR_VEC_BASE
);
134 READ_BCR(ARC_REG_MUL_BCR
, cpu
->extn_mpy
);
136 cpu
->extn
.norm
= read_aux_reg(ARC_REG_NORM_BCR
) > 1 ? 1 : 0; /* 2,3 */
137 cpu
->extn
.barrel
= read_aux_reg(ARC_REG_BARREL_BCR
) > 1 ? 1 : 0; /* 2,3 */
138 cpu
->extn
.swap
= read_aux_reg(ARC_REG_SWAP_BCR
) ? 1 : 0; /* 1,3 */
139 cpu
->extn
.crc
= read_aux_reg(ARC_REG_CRC_BCR
) ? 1 : 0;
140 cpu
->extn
.minmax
= read_aux_reg(ARC_REG_MIXMAX_BCR
) > 1 ? 1 : 0; /* 2 */
141 cpu
->extn
.swape
= (cpu
->core
.family
>= 0x34) ? 1 :
142 IS_ENABLED(CONFIG_ARC_HAS_SWAPE
);
144 READ_BCR(ARC_REG_XY_MEM_BCR
, cpu
->extn_xymem
);
146 /* Read CCM BCRs for boot reporting even if not enabled in Kconfig */
147 read_decode_ccm_bcr(cpu
);
149 read_decode_mmu_bcr();
150 read_decode_cache_bcr();
152 if (is_isa_arcompact()) {
153 struct bcr_fp_arcompact sp
, dp
;
154 struct bcr_bpu_arcompact bpu
;
156 READ_BCR(ARC_REG_FP_BCR
, sp
);
157 READ_BCR(ARC_REG_DPFP_BCR
, dp
);
158 cpu
->extn
.fpu_sp
= sp
.ver
? 1 : 0;
159 cpu
->extn
.fpu_dp
= dp
.ver
? 1 : 0;
161 READ_BCR(ARC_REG_BPU_BCR
, bpu
);
162 cpu
->bpu
.ver
= bpu
.ver
;
163 cpu
->bpu
.full
= bpu
.fam
? 1 : 0;
165 cpu
->bpu
.num_cache
= 256 << (bpu
.ent
- 1);
166 cpu
->bpu
.num_pred
= 256 << (bpu
.ent
- 1);
169 struct bcr_fp_arcv2 spdp
;
170 struct bcr_bpu_arcv2 bpu
;
172 READ_BCR(ARC_REG_FP_V2_BCR
, spdp
);
173 cpu
->extn
.fpu_sp
= spdp
.sp
? 1 : 0;
174 cpu
->extn
.fpu_dp
= spdp
.dp
? 1 : 0;
176 READ_BCR(ARC_REG_BPU_BCR
, bpu
);
177 cpu
->bpu
.ver
= bpu
.ver
;
178 cpu
->bpu
.full
= bpu
.ft
;
179 cpu
->bpu
.num_cache
= 256 << bpu
.bce
;
180 cpu
->bpu
.num_pred
= 2048 << bpu
.pte
;
183 READ_BCR(ARC_REG_AP_BCR
, bcr
);
184 cpu
->extn
.ap
= bcr
.ver
? 1 : 0;
186 READ_BCR(ARC_REG_SMART_BCR
, bcr
);
187 cpu
->extn
.smart
= bcr
.ver
? 1 : 0;
189 READ_BCR(ARC_REG_RTT_BCR
, bcr
);
190 cpu
->extn
.rtt
= bcr
.ver
? 1 : 0;
192 cpu
->extn
.debug
= cpu
->extn
.ap
| cpu
->extn
.smart
| cpu
->extn
.rtt
;
194 /* some hacks for lack of feature BCR info in old ARC700 cores */
195 if (is_isa_arcompact()) {
196 if (!cpu
->isa
.ver
) /* ISA BCR absent, use Kconfig info */
197 cpu
->isa
.atomic
= IS_ENABLED(CONFIG_ARC_HAS_LLSC
);
199 cpu
->isa
.atomic
= cpu
->isa
.atomic1
;
201 cpu
->isa
.be
= IS_ENABLED(CONFIG_CPU_BIG_ENDIAN
);
205 static char *arc_cpu_mumbojumbo(int cpu_id
, char *buf
, int len
)
207 struct cpuinfo_arc
*cpu
= &cpuinfo_arc700
[cpu_id
];
208 struct bcr_identity
*core
= &cpu
->core
;
213 n
+= scnprintf(buf
+ n
, len
- n
,
214 "\nIDENTITY\t: ARCVER [%#02x] ARCNUM [%#02x] CHIPID [%#4x]\n",
215 core
->family
, core
->cpu_id
, core
->chip_id
);
217 n
+= scnprintf(buf
+ n
, len
- n
, "processor [%d]\t: %s (%s ISA) %s\n",
218 cpu_id
, cpu
->details
,
219 is_isa_arcompact() ? "ARCompact" : "ARCv2",
220 IS_AVAIL1(cpu
->isa
.be
, "[Big-Endian]"));
222 n
+= scnprintf(buf
+ n
, len
- n
, "Timers\t\t: %s%s%s%s\nISA Extn\t: ",
223 IS_AVAIL1(cpu
->extn
.timer0
, "Timer0 "),
224 IS_AVAIL1(cpu
->extn
.timer1
, "Timer1 "),
225 IS_AVAIL2(cpu
->extn
.rtc
, "Local-64-bit-Ctr ",
226 CONFIG_ARC_HAS_RTC
));
228 n
+= i
= scnprintf(buf
+ n
, len
- n
, "%s%s%s%s%s",
229 IS_AVAIL2(cpu
->isa
.atomic
, "atomic ", CONFIG_ARC_HAS_LLSC
),
230 IS_AVAIL2(cpu
->isa
.ldd
, "ll64 ", CONFIG_ARC_HAS_LL64
),
231 IS_AVAIL1(cpu
->isa
.unalign
, "unalign (not used)"));
234 n
+= scnprintf(buf
+ n
, len
- n
, "\n\t\t: ");
236 if (cpu
->extn_mpy
.ver
) {
237 if (cpu
->extn_mpy
.ver
<= 0x2) { /* ARCompact */
238 n
+= scnprintf(buf
+ n
, len
- n
, "mpy ");
240 int opt
= 2; /* stock MPY/MPYH */
242 if (cpu
->extn_mpy
.dsp
) /* OPT 7-9 */
243 opt
= cpu
->extn_mpy
.dsp
+ 6;
245 n
+= scnprintf(buf
+ n
, len
- n
, "mpy[opt %d] ", opt
);
249 n
+= scnprintf(buf
+ n
, len
- n
, "%s%s%s%s%s%s%s%s\n",
250 IS_AVAIL1(cpu
->isa
.div_rem
, "div_rem "),
251 IS_AVAIL1(cpu
->extn
.norm
, "norm "),
252 IS_AVAIL1(cpu
->extn
.barrel
, "barrel-shift "),
253 IS_AVAIL1(cpu
->extn
.swap
, "swap "),
254 IS_AVAIL1(cpu
->extn
.minmax
, "minmax "),
255 IS_AVAIL1(cpu
->extn
.crc
, "crc "),
256 IS_AVAIL2(cpu
->extn
.swape
, "swape", CONFIG_ARC_HAS_SWAPE
));
259 n
+= scnprintf(buf
+ n
, len
- n
,
260 "BPU\t\t: %s%s match, cache:%d, Predict Table:%d\n",
261 IS_AVAIL1(cpu
->bpu
.full
, "full"),
262 IS_AVAIL1(!cpu
->bpu
.full
, "partial"),
263 cpu
->bpu
.num_cache
, cpu
->bpu
.num_pred
);
268 static char *arc_extn_mumbojumbo(int cpu_id
, char *buf
, int len
)
271 struct cpuinfo_arc
*cpu
= &cpuinfo_arc700
[cpu_id
];
275 n
+= scnprintf(buf
+ n
, len
- n
, "Vector Table\t: %#x\n", cpu
->vec_base
);
277 if (cpu
->extn
.fpu_sp
|| cpu
->extn
.fpu_dp
)
278 n
+= scnprintf(buf
+ n
, len
- n
, "FPU\t\t: %s%s\n",
279 IS_AVAIL1(cpu
->extn
.fpu_sp
, "SP "),
280 IS_AVAIL1(cpu
->extn
.fpu_dp
, "DP "));
283 n
+= scnprintf(buf
+ n
, len
- n
, "DEBUG\t\t: %s%s%s\n",
284 IS_AVAIL1(cpu
->extn
.ap
, "ActionPoint "),
285 IS_AVAIL1(cpu
->extn
.smart
, "smaRT "),
286 IS_AVAIL1(cpu
->extn
.rtt
, "RTT "));
288 if (cpu
->dccm
.sz
|| cpu
->iccm
.sz
)
289 n
+= scnprintf(buf
+ n
, len
- n
, "Extn [CCM]\t: DCCM @ %x, %d KB / ICCM: @ %x, %d KB\n",
290 cpu
->dccm
.base_addr
, TO_KB(cpu
->dccm
.sz
),
291 cpu
->iccm
.base_addr
, TO_KB(cpu
->iccm
.sz
));
293 n
+= scnprintf(buf
+ n
, len
- n
, "OS ABI [v%d]\t: %s\n",
294 EF_ARC_OSABI_CURRENT
>> 8,
295 EF_ARC_OSABI_CURRENT
== EF_ARC_OSABI_V3
?
296 "no-legacy-syscalls" : "64-bit data any register aligned");
301 static void arc_chk_core_config(void)
303 struct cpuinfo_arc
*cpu
= &cpuinfo_arc700
[smp_processor_id()];
306 if (!cpu
->extn
.timer0
)
307 panic("Timer0 is not present!\n");
309 if (!cpu
->extn
.timer1
)
310 panic("Timer1 is not present!\n");
312 #ifdef CONFIG_ARC_HAS_DCCM
314 * DCCM can be arbit placed in hardware.
315 * Make sure it's placement/sz matches what Linux is built with
317 if ((unsigned int)__arc_dccm_base
!= cpu
->dccm
.base_addr
)
318 panic("Linux built with incorrect DCCM Base address\n");
320 if (CONFIG_ARC_DCCM_SZ
!= cpu
->dccm
.sz
)
321 panic("Linux built with incorrect DCCM Size\n");
324 #ifdef CONFIG_ARC_HAS_ICCM
325 if (CONFIG_ARC_ICCM_SZ
!= cpu
->iccm
.sz
)
326 panic("Linux built with incorrect ICCM Size\n");
330 * FP hardware/software config sanity
331 * -If hardware contains DPFP, kernel needs to save/restore FPU state
332 * -If not, it will crash trying to save/restore the non-existant regs
334 * (only DPDP checked since SP has no arch visible regs)
336 fpu_enabled
= IS_ENABLED(CONFIG_ARC_FPU_SAVE_RESTORE
);
338 if (cpu
->extn
.fpu_dp
&& !fpu_enabled
)
339 pr_warn("CONFIG_ARC_FPU_SAVE_RESTORE needed for working apps\n");
340 else if (!cpu
->extn
.fpu_dp
&& fpu_enabled
)
341 panic("FPU non-existent, disable CONFIG_ARC_FPU_SAVE_RESTORE\n");
345 * Initialize and setup the processor core
346 * This is called by all the CPUs thus should not do special case stuff
347 * such as only for boot CPU etc
350 void setup_processor(void)
353 int cpu_id
= smp_processor_id();
355 read_arc_build_cfg_regs();
358 printk(arc_cpu_mumbojumbo(cpu_id
, str
, sizeof(str
)));
363 printk(arc_extn_mumbojumbo(cpu_id
, str
, sizeof(str
)));
364 printk(arc_platform_smp_cpuinfo());
366 arc_chk_core_config();
369 static inline int is_kernel(unsigned long addr
)
371 if (addr
>= (unsigned long)_stext
&& addr
<= (unsigned long)_end
)
376 void __init
setup_arch(char **cmdline_p
)
378 #ifdef CONFIG_ARC_UBOOT_SUPPORT
379 /* make sure that uboot passed pointer to cmdline/dtb is valid */
380 if (uboot_tag
&& is_kernel((unsigned long)uboot_arg
))
381 panic("Invalid uboot arg\n");
383 /* See if u-boot passed an external Device Tree blob */
384 machine_desc
= setup_machine_fdt(uboot_arg
); /* uboot_tag == 2 */
388 /* No, so try the embedded one */
389 machine_desc
= setup_machine_fdt(__dtb_start
);
391 panic("Embedded DT invalid\n");
394 * If we are here, it is established that @uboot_arg didn't
395 * point to DT blob. Instead if u-boot says it is cmdline,
396 * append to embedded DT cmdline.
397 * setup_machine_fdt() would have populated @boot_command_line
399 if (uboot_tag
== 1) {
400 /* Ensure a whitespace between the 2 cmdlines */
401 strlcat(boot_command_line
, " ", COMMAND_LINE_SIZE
);
402 strlcat(boot_command_line
, uboot_arg
,
407 /* Save unparsed command line copy for /proc/cmdline */
408 *cmdline_p
= boot_command_line
;
410 /* To force early parsing of things like mem=xxx */
413 /* Platform/board specific: e.g. early console registration */
414 if (machine_desc
->init_early
)
415 machine_desc
->init_early();
422 /* copy flat DT out of .init and then unflatten it */
423 unflatten_and_copy_device_tree();
425 /* Can be issue if someone passes cmd line arg "ro"
426 * But that is unlikely so keeping it as it is
428 root_mountflags
&= ~MS_RDONLY
;
430 #if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
431 conswitchp
= &dummy_con
;
437 static int __init
customize_machine(void)
439 if (machine_desc
->init_machine
)
440 machine_desc
->init_machine();
444 arch_initcall(customize_machine
);
446 static int __init
init_late_machine(void)
448 if (machine_desc
->init_late
)
449 machine_desc
->init_late();
453 late_initcall(init_late_machine
);
455 * Get CPU information for use by the procfs.
458 #define cpu_to_ptr(c) ((void *)(0xFFFF0000 | (unsigned int)(c)))
459 #define ptr_to_cpu(p) (~0xFFFF0000UL & (unsigned int)(p))
461 static int show_cpuinfo(struct seq_file
*m
, void *v
)
464 int cpu_id
= ptr_to_cpu(v
);
465 struct device_node
*core_clk
= of_find_node_by_name(NULL
, "core_clk");
468 if (!cpu_online(cpu_id
)) {
469 seq_printf(m
, "processor [%d]\t: Offline\n", cpu_id
);
473 str
= (char *)__get_free_page(GFP_TEMPORARY
);
477 seq_printf(m
, arc_cpu_mumbojumbo(cpu_id
, str
, PAGE_SIZE
));
479 of_property_read_u32(core_clk
, "clock-frequency", &freq
);
481 seq_printf(m
, "CPU speed\t: %u.%02u Mhz\n",
482 freq
/ 1000000, (freq
/ 10000) % 100);
484 seq_printf(m
, "Bogo MIPS\t: %lu.%02lu\n",
485 loops_per_jiffy
/ (500000 / HZ
),
486 (loops_per_jiffy
/ (5000 / HZ
)) % 100);
488 seq_printf(m
, arc_mmu_mumbojumbo(cpu_id
, str
, PAGE_SIZE
));
489 seq_printf(m
, arc_cache_mumbojumbo(cpu_id
, str
, PAGE_SIZE
));
490 seq_printf(m
, arc_extn_mumbojumbo(cpu_id
, str
, PAGE_SIZE
));
491 seq_printf(m
, arc_platform_smp_cpuinfo());
493 free_page((unsigned long)str
);
500 static void *c_start(struct seq_file
*m
, loff_t
*pos
)
503 * Callback returns cpu-id to iterator for show routine, NULL to stop.
504 * However since NULL is also a valid cpu-id (0), we use a round-about
505 * way to pass it w/o having to kmalloc/free a 2 byte string.
506 * Encode cpu-id as 0xFFcccc, which is decoded by show routine.
508 return *pos
< nr_cpu_ids
? cpu_to_ptr(*pos
) : NULL
;
511 static void *c_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
514 return c_start(m
, pos
);
517 static void c_stop(struct seq_file
*m
, void *v
)
521 const struct seq_operations cpuinfo_op
= {
528 static DEFINE_PER_CPU(struct cpu
, cpu_topology
);
530 static int __init
topology_init(void)
534 for_each_present_cpu(cpu
)
535 register_cpu(&per_cpu(cpu_topology
, cpu
), cpu
);
540 subsys_initcall(topology_init
);