setup.c revision 619f30188ff0d10fccc3cd952a79cb56ff62db54 
1/*
2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
3 *
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.
7 */
8
9#include <linux/seq_file.h>
10#include <linux/fs.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>
17#include <linux/cache.h>
18#include <asm/sections.h>
19#include <asm/arcregs.h>
20#include <asm/tlb.h>
21#include <asm/setup.h>
22#include <asm/page.h>
23#include <asm/irq.h>
24#include <asm/unwind.h>
25#include <asm/clk.h>
26#include <asm/mach_desc.h>
27#include <asm/smp.h>
28
29#define FIX_PTR(x)  __asm__ __volatile__(";" : "+r"(x))
30
31int running_on_hw = 1;	/* vs. on ISS */
32
33/* Part of U-boot ABI: see head.S */
34int __initdata uboot_tag;
35char __initdata *uboot_arg;
36
37const struct machine_desc *machine_desc;
38
39struct task_struct *_current_task[NR_CPUS];	/* For stack switching */
40
41struct cpuinfo_arc cpuinfo_arc700[NR_CPUS];
42
43static void read_arc_build_cfg_regs(void)
44{
45	struct bcr_perip uncached_space;
46	struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
47	FIX_PTR(cpu);
48
49	READ_BCR(AUX_IDENTITY, cpu->core);
50
51	cpu->timers = read_aux_reg(ARC_REG_TIMERS_BCR);
52	cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE);
53
54	READ_BCR(ARC_REG_D_UNCACH_BCR, uncached_space);
55	cpu->uncached_base = uncached_space.start << 24;
56
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);
63
64	cpu->extn.ext_arith = read_aux_reg(ARC_REG_EXTARITH_BCR);
65	cpu->extn.crc = read_aux_reg(ARC_REG_CRC_BCR);
66
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
70	 */
71	{
72		struct bcr_iccm iccm;
73		struct bcr_dccm dccm;
74		struct bcr_dccm_base dccm_base;
75		unsigned int bcr_32bit_val;
76
77		bcr_32bit_val = read_aux_reg(ARC_REG_ICCM_BCR);
78		if (bcr_32bit_val) {
79			iccm = *((struct bcr_iccm *)&bcr_32bit_val);
80			cpu->iccm.base_addr = iccm.base << 16;
81			cpu->iccm.sz = 0x2000 << (iccm.sz - 1);
82		}
83
84		bcr_32bit_val = read_aux_reg(ARC_REG_DCCM_BCR);
85		if (bcr_32bit_val) {
86			dccm = *((struct bcr_dccm *)&bcr_32bit_val);
87			cpu->dccm.sz = 0x800 << (dccm.sz);
88
89			READ_BCR(ARC_REG_DCCMBASE_BCR, dccm_base);
90			cpu->dccm.base_addr = dccm_base.addr << 8;
91		}
92	}
93
94	READ_BCR(ARC_REG_XY_MEM_BCR, cpu->extn_xymem);
95
96	read_decode_mmu_bcr();
97	read_decode_cache_bcr();
98
99	READ_BCR(ARC_REG_FP_BCR, cpu->fp);
100	READ_BCR(ARC_REG_DPFP_BCR, cpu->dpfp);
101}
102
103static 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},
108	{ {0x00, NULL		} }
109};
110
111static char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len)
112{
113	int n = 0;
114	struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
115	struct bcr_identity *core = &cpu->core;
116	const struct cpuinfo_data *tbl;
117	int be = 0;
118#ifdef CONFIG_CPU_BIG_ENDIAN
119	be = 1;
120#endif
121	FIX_PTR(cpu);
122
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,
127		       core->chip_id);
128
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",
134				       tbl->info.str,
135				       be ? "[Big Endian]" : "");
136			break;
137		}
138	}
139
140	if (tbl->info.id == 0)
141		n += scnprintf(buf + n, len - n, "UNKNOWN ARC Processor\n");
142
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);
146
147	n += scnprintf(buf + n, len - n, "Timers\t\t: %s %s\n",
148		       (cpu->timers & 0x200) ? "TIMER1" : "",
149		       (cpu->timers & 0x100) ? "TIMER0" : "");
150
151	n += scnprintf(buf + n, len - n, "Vect Tbl Base\t: %#x\n",
152		       cpu->vec_base);
153
154	n += scnprintf(buf + n, len - n, "UNCACHED Base\t: %#x\n",
155		       cpu->uncached_base);
156
157	return buf;
158}
159
160static const struct id_to_str mul_type_nm[] = {
161	{ 0x0, "N/A"},
162	{ 0x1, "32x32 (spl Result Reg)" },
163	{ 0x2, "32x32 (ANY Result Reg)" }
164};
165
166static const struct id_to_str mac_mul_nm[] = {
167	{0x0, "N/A"},
168	{0x1, "N/A"},
169	{0x2, "Dual 16 x 16"},
170	{0x3, "N/A"},
171	{0x4, "32x16"},
172	{0x5, "N/A"},
173	{0x6, "Dual 16x16 and 32x16"}
174};
175
176static char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len)
177{
178	int n = 0;
179	struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
180
181	FIX_PTR(cpu);
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)")
185
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"));
194
195	n += scnprintf(buf + n, len - n, "Extn [700-MPY]\t: %s",
196		       mul_type_nm[cpu->extn.mul].str);
197
198	n += scnprintf(buf + n, len - n, "   MAC MPY: %s\n",
199		       mac_mul_nm[cpu->extn_mac_mul.type].str);
200
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));
207	}
208
209	n += scnprintf(buf + n, len - n, "Extn [CCM]\t: %s",
210		       !(cpu->dccm.sz || cpu->iccm.sz) ? "N/A" : "");
211
212	if (cpu->dccm.sz)
213		n += scnprintf(buf + n, len - n, "DCCM: @ %x, %d KB ",
214			       cpu->dccm.base_addr, TO_KB(cpu->dccm.sz));
215
216	if (cpu->iccm.sz)
217		n += scnprintf(buf + n, len - n, "ICCM: @ %x, %d KB",
218			       cpu->iccm.base_addr, TO_KB(cpu->iccm.sz));
219
220	n += scnprintf(buf + n, len - n, "\nExtn [FPU]\t: %s",
221		       !(cpu->fp.ver || cpu->dpfp.ver) ? "N/A" : "");
222
223	if (cpu->fp.ver)
224		n += scnprintf(buf + n, len - n, "SP [v%d] %s",
225			       cpu->fp.ver, cpu->fp.fast ? "(fast)" : "");
226
227	if (cpu->dpfp.ver)
228		n += scnprintf(buf + n, len - n, "DP [v%d] %s",
229			       cpu->dpfp.ver, cpu->dpfp.fast ? "(fast)" : "");
230
231	n += scnprintf(buf + n, len - n, "\n");
232
233	n += scnprintf(buf + n, len - n,
234		       "OS ABI [v3]\t: no-legacy-syscalls\n");
235
236	return buf;
237}
238
239static void arc_chk_ccms(void)
240{
241#if defined(CONFIG_ARC_HAS_DCCM) || defined(CONFIG_ARC_HAS_ICCM)
242	struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
243
244#ifdef CONFIG_ARC_HAS_DCCM
245	/*
246	 * DCCM can be arbit placed in hardware.
247	 * Make sure it's placement/sz matches what Linux is built with
248	 */
249	if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr)
250		panic("Linux built with incorrect DCCM Base address\n");
251
252	if (CONFIG_ARC_DCCM_SZ != cpu->dccm.sz)
253		panic("Linux built with incorrect DCCM Size\n");
254#endif
255
256#ifdef CONFIG_ARC_HAS_ICCM
257	if (CONFIG_ARC_ICCM_SZ != cpu->iccm.sz)
258		panic("Linux built with incorrect ICCM Size\n");
259#endif
260#endif
261}
262
263/*
264 * Ensure that FP hardware and kernel config match
265 * -If hardware contains DPFP, kernel needs to save/restore FPU state
266 *  across context switches
267 * -If hardware lacks DPFP, but kernel configured to save FPU state then
268 *  kernel trying to access non-existant DPFP regs will crash
269 *
270 * We only check for Dbl precision Floating Point, because only DPFP
271 * hardware has dedicated regs which need to be saved/restored on ctx-sw
272 * (Single Precision uses core regs), thus kernel is kind of oblivious to it
273 */
274static void arc_chk_fpu(void)
275{
276	struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
277
278	if (cpu->dpfp.ver) {
279#ifndef CONFIG_ARC_FPU_SAVE_RESTORE
280		pr_warn("DPFP support broken in this kernel...\n");
281#endif
282	} else {
283#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
284		panic("H/w lacks DPFP support, apps won't work\n");
285#endif
286	}
287}
288
289/*
290 * Initialize and setup the processor core
291 * This is called by all the CPUs thus should not do special case stuff
292 *    such as only for boot CPU etc
293 */
294
295void setup_processor(void)
296{
297	char str[512];
298	int cpu_id = smp_processor_id();
299
300	read_arc_build_cfg_regs();
301	arc_init_IRQ();
302
303	printk(arc_cpu_mumbojumbo(cpu_id, str, sizeof(str)));
304
305	arc_mmu_init();
306	arc_cache_init();
307	arc_chk_ccms();
308
309	printk(arc_extn_mumbojumbo(cpu_id, str, sizeof(str)));
310	printk(arc_platform_smp_cpuinfo());
311
312	arc_chk_fpu();
313}
314
315static inline int is_kernel(unsigned long addr)
316{
317	if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end)
318		return 1;
319	return 0;
320}
321
322void __init setup_arch(char **cmdline_p)
323{
324	/* make sure that uboot passed pointer to cmdline/dtb is valid */
325	if (uboot_tag && is_kernel((unsigned long)uboot_arg))
326		panic("Invalid uboot arg\n");
327
328	/* See if u-boot passed an external Device Tree blob */
329	machine_desc = setup_machine_fdt(uboot_arg);	/* uboot_tag == 2 */
330	if (!machine_desc) {
331		/* No, so try the embedded one */
332		machine_desc = setup_machine_fdt(__dtb_start);
333		if (!machine_desc)
334			panic("Embedded DT invalid\n");
335
336		/*
337		 * If we are here, it is established that @uboot_arg didn't
338		 * point to DT blob. Instead if u-boot says it is cmdline,
339		 * Appent to embedded DT cmdline.
340		 * setup_machine_fdt() would have populated @boot_command_line
341		 */
342		if (uboot_tag == 1) {
343			/* Ensure a whitespace between the 2 cmdlines */
344			strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
345			strlcat(boot_command_line, uboot_arg,
346				COMMAND_LINE_SIZE);
347		}
348	}
349
350	/* Save unparsed command line copy for /proc/cmdline */
351	*cmdline_p = boot_command_line;
352
353	/* To force early parsing of things like mem=xxx */
354	parse_early_param();
355
356	/* Platform/board specific: e.g. early console registration */
357	if (machine_desc->init_early)
358		machine_desc->init_early();
359
360	setup_processor();
361	smp_init_cpus();
362	setup_arch_memory();
363
364	/* copy flat DT out of .init and then unflatten it */
365	unflatten_and_copy_device_tree();
366
367	/* Can be issue if someone passes cmd line arg "ro"
368	 * But that is unlikely so keeping it as it is
369	 */
370	root_mountflags &= ~MS_RDONLY;
371
372#if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
373	conswitchp = &dummy_con;
374#endif
375
376	arc_unwind_init();
377	arc_unwind_setup();
378}
379
380static int __init customize_machine(void)
381{
382	/* Add platform devices */
383	if (machine_desc->init_machine)
384		machine_desc->init_machine();
385
386	return 0;
387}
388arch_initcall(customize_machine);
389
390static int __init init_late_machine(void)
391{
392	if (machine_desc->init_late)
393		machine_desc->init_late();
394
395	return 0;
396}
397late_initcall(init_late_machine);
398/*
399 *  Get CPU information for use by the procfs.
400 */
401
402#define cpu_to_ptr(c)	((void *)(0xFFFF0000 | (unsigned int)(c)))
403#define ptr_to_cpu(p)	(~0xFFFF0000UL & (unsigned int)(p))
404
405static int show_cpuinfo(struct seq_file *m, void *v)
406{
407	char *str;
408	int cpu_id = ptr_to_cpu(v);
409
410	str = (char *)__get_free_page(GFP_TEMPORARY);
411	if (!str)
412		goto done;
413
414	seq_printf(m, arc_cpu_mumbojumbo(cpu_id, str, PAGE_SIZE));
415
416	seq_printf(m, "Bogo MIPS : \t%lu.%02lu\n",
417		   loops_per_jiffy / (500000 / HZ),
418		   (loops_per_jiffy / (5000 / HZ)) % 100);
419
420	seq_printf(m, arc_mmu_mumbojumbo(cpu_id, str, PAGE_SIZE));
421	seq_printf(m, arc_cache_mumbojumbo(cpu_id, str, PAGE_SIZE));
422	seq_printf(m, arc_extn_mumbojumbo(cpu_id, str, PAGE_SIZE));
423	seq_printf(m, arc_platform_smp_cpuinfo());
424
425	free_page((unsigned long)str);
426done:
427	seq_printf(m, "\n\n");
428
429	return 0;
430}
431
432static void *c_start(struct seq_file *m, loff_t *pos)
433{
434	/*
435	 * Callback returns cpu-id to iterator for show routine, NULL to stop.
436	 * However since NULL is also a valid cpu-id (0), we use a round-about
437	 * way to pass it w/o having to kmalloc/free a 2 byte string.
438	 * Encode cpu-id as 0xFFcccc, which is decoded by show routine.
439	 */
440	return *pos < num_possible_cpus() ? cpu_to_ptr(*pos) : NULL;
441}
442
443static void *c_next(struct seq_file *m, void *v, loff_t *pos)
444{
445	++*pos;
446	return c_start(m, pos);
447}
448
449static void c_stop(struct seq_file *m, void *v)
450{
451}
452
453const struct seq_operations cpuinfo_op = {
454	.start	= c_start,
455	.next	= c_next,
456	.stop	= c_stop,
457	.show	= show_cpuinfo
458};
459
460static DEFINE_PER_CPU(struct cpu, cpu_topology);
461
462static int __init topology_init(void)
463{
464	int cpu;
465
466	for_each_present_cpu(cpu)
467	    register_cpu(&per_cpu(cpu_topology, cpu), cpu);
468
469	return 0;
470}
471
472subsys_initcall(topology_init);
473