setup.c revision 1efc959e0b28942d69d3084ecd4e9bde3beb9866 
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/prom.h>
25#include <asm/unwind.h>
26#include <asm/clk.h>
27#include <asm/mach_desc.h>
28
29#define FIX_PTR(x)  __asm__ __volatile__(";" : "+r"(x))
30
31int running_on_hw = 1;	/* vs. on ISS */
32
33char __initdata command_line[COMMAND_LINE_SIZE];
34struct machine_desc *machine_desc;
35
36struct task_struct *_current_task[NR_CPUS];	/* For stack switching */
37
38struct cpuinfo_arc cpuinfo_arc700[NR_CPUS];
39
40
41void read_arc_build_cfg_regs(void)
42{
43	struct bcr_perip uncached_space;
44	struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
45	FIX_PTR(cpu);
46
47	READ_BCR(AUX_IDENTITY, cpu->core);
48
49	cpu->timers = read_aux_reg(ARC_REG_TIMERS_BCR);
50	cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE);
51
52	READ_BCR(ARC_REG_D_UNCACH_BCR, uncached_space);
53	cpu->uncached_base = uncached_space.start << 24;
54
55	cpu->extn.mul = read_aux_reg(ARC_REG_MUL_BCR);
56	cpu->extn.swap = read_aux_reg(ARC_REG_SWAP_BCR);
57	cpu->extn.norm = read_aux_reg(ARC_REG_NORM_BCR);
58	cpu->extn.minmax = read_aux_reg(ARC_REG_MIXMAX_BCR);
59	cpu->extn.barrel = read_aux_reg(ARC_REG_BARREL_BCR);
60	READ_BCR(ARC_REG_MAC_BCR, cpu->extn_mac_mul);
61
62	cpu->extn.ext_arith = read_aux_reg(ARC_REG_EXTARITH_BCR);
63	cpu->extn.crc = read_aux_reg(ARC_REG_CRC_BCR);
64
65	/* Note that we read the CCM BCRs independent of kernel config
66	 * This is to catch the cases where user doesn't know that
67	 * CCMs are present in hardware build
68	 */
69	{
70		struct bcr_iccm iccm;
71		struct bcr_dccm dccm;
72		struct bcr_dccm_base dccm_base;
73		unsigned int bcr_32bit_val;
74
75		bcr_32bit_val = read_aux_reg(ARC_REG_ICCM_BCR);
76		if (bcr_32bit_val) {
77			iccm = *((struct bcr_iccm *)&bcr_32bit_val);
78			cpu->iccm.base_addr = iccm.base << 16;
79			cpu->iccm.sz = 0x2000 << (iccm.sz - 1);
80		}
81
82		bcr_32bit_val = read_aux_reg(ARC_REG_DCCM_BCR);
83		if (bcr_32bit_val) {
84			dccm = *((struct bcr_dccm *)&bcr_32bit_val);
85			cpu->dccm.sz = 0x800 << (dccm.sz);
86
87			READ_BCR(ARC_REG_DCCMBASE_BCR, dccm_base);
88			cpu->dccm.base_addr = dccm_base.addr << 8;
89		}
90	}
91
92	READ_BCR(ARC_REG_XY_MEM_BCR, cpu->extn_xymem);
93
94	read_decode_mmu_bcr();
95	read_decode_cache_bcr();
96
97	READ_BCR(ARC_REG_FP_BCR, cpu->fp);
98	READ_BCR(ARC_REG_DPFP_BCR, cpu->dpfp);
99}
100
101static const struct cpuinfo_data arc_cpu_tbl[] = {
102	{ {0x10, "ARCTangent A5"}, 0x1F},
103	{ {0x20, "ARC 600"      }, 0x2F},
104	{ {0x30, "ARC 700"      }, 0x33},
105	{ {0x34, "ARC 700 R4.10"}, 0x34},
106	{ {0x00, NULL		} }
107};
108
109char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len)
110{
111	int n = 0;
112	struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
113	struct bcr_identity *core = &cpu->core;
114	const struct cpuinfo_data *tbl;
115	int be = 0;
116#ifdef CONFIG_CPU_BIG_ENDIAN
117	be = 1;
118#endif
119	FIX_PTR(cpu);
120
121	n += scnprintf(buf + n, len - n,
122		       "\nARC IDENTITY\t: Family [%#02x]"
123		       " Cpu-id [%#02x] Chip-id [%#4x]\n",
124		       core->family, core->cpu_id,
125		       core->chip_id);
126
127	for (tbl = &arc_cpu_tbl[0]; tbl->info.id != 0; tbl++) {
128		if ((core->family >= tbl->info.id) &&
129		    (core->family <= tbl->up_range)) {
130			n += scnprintf(buf + n, len - n,
131				       "processor\t: %s %s\n",
132				       tbl->info.str,
133				       be ? "[Big Endian]" : "");
134			break;
135		}
136	}
137
138	if (tbl->info.id == 0)
139		n += scnprintf(buf + n, len - n, "UNKNOWN ARC Processor\n");
140
141	n += scnprintf(buf + n, len - n, "CPU speed\t: %u.%02u Mhz\n",
142		       (unsigned int)(arc_get_core_freq() / 1000000),
143		       (unsigned int)(arc_get_core_freq() / 10000) % 100);
144
145	n += scnprintf(buf + n, len - n, "Timers\t\t: %s %s\n",
146		       (cpu->timers & 0x200) ? "TIMER1" : "",
147		       (cpu->timers & 0x100) ? "TIMER0" : "");
148
149	n += scnprintf(buf + n, len - n, "Vect Tbl Base\t: %#x\n",
150		       cpu->vec_base);
151
152	n += scnprintf(buf + n, len - n, "UNCACHED Base\t: %#x\n",
153		       cpu->uncached_base);
154
155	return buf;
156}
157
158static const struct id_to_str mul_type_nm[] = {
159	{ 0x0, "N/A"},
160	{ 0x1, "32x32 (spl Result Reg)" },
161	{ 0x2, "32x32 (ANY Result Reg)" }
162};
163
164static const struct id_to_str mac_mul_nm[] = {
165	{0x0, "N/A"},
166	{0x1, "N/A"},
167	{0x2, "Dual 16 x 16"},
168	{0x3, "N/A"},
169	{0x4, "32x16"},
170	{0x5, "N/A"},
171	{0x6, "Dual 16x16 and 32x16"}
172};
173
174char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len)
175{
176	int n = 0;
177	struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
178
179	FIX_PTR(cpu);
180#define IS_AVAIL1(var, str)	((var) ? str : "")
181#define IS_AVAIL2(var, str)	((var == 0x2) ? str : "")
182#define IS_USED(cfg)		(IS_ENABLED(cfg) ? "(in-use)" : "(not used)")
183
184	n += scnprintf(buf + n, len - n,
185		       "Extn [700-Base]\t: %s %s %s %s %s %s\n",
186		       IS_AVAIL2(cpu->extn.norm, "norm,"),
187		       IS_AVAIL2(cpu->extn.barrel, "barrel-shift,"),
188		       IS_AVAIL1(cpu->extn.swap, "swap,"),
189		       IS_AVAIL2(cpu->extn.minmax, "minmax,"),
190		       IS_AVAIL1(cpu->extn.crc, "crc,"),
191		       IS_AVAIL2(cpu->extn.ext_arith, "ext-arith"));
192
193	n += scnprintf(buf + n, len - n, "Extn [700-MPY]\t: %s",
194		       mul_type_nm[cpu->extn.mul].str);
195
196	n += scnprintf(buf + n, len - n, "   MAC MPY: %s\n",
197		       mac_mul_nm[cpu->extn_mac_mul.type].str);
198
199	if (cpu->core.family == 0x34) {
200		n += scnprintf(buf + n, len - n,
201		"Extn [700-4.10]\t: LLOCK/SCOND %s, SWAPE %s, RTSC %s\n",
202			       IS_USED(CONFIG_ARC_HAS_LLSC),
203			       IS_USED(CONFIG_ARC_HAS_SWAPE),
204			       IS_USED(CONFIG_ARC_HAS_RTSC));
205	}
206
207	n += scnprintf(buf + n, len - n, "Extn [CCM]\t: %s",
208		       !(cpu->dccm.sz || cpu->iccm.sz) ? "N/A" : "");
209
210	if (cpu->dccm.sz)
211		n += scnprintf(buf + n, len - n, "DCCM: @ %x, %d KB ",
212			       cpu->dccm.base_addr, TO_KB(cpu->dccm.sz));
213
214	if (cpu->iccm.sz)
215		n += scnprintf(buf + n, len - n, "ICCM: @ %x, %d KB",
216			       cpu->iccm.base_addr, TO_KB(cpu->iccm.sz));
217
218	n += scnprintf(buf + n, len - n, "\nExtn [FPU]\t: %s",
219		       !(cpu->fp.ver || cpu->dpfp.ver) ? "N/A" : "");
220
221	if (cpu->fp.ver)
222		n += scnprintf(buf + n, len - n, "SP [v%d] %s",
223			       cpu->fp.ver, cpu->fp.fast ? "(fast)" : "");
224
225	if (cpu->dpfp.ver)
226		n += scnprintf(buf + n, len - n, "DP [v%d] %s",
227			       cpu->dpfp.ver, cpu->dpfp.fast ? "(fast)" : "");
228
229	n += scnprintf(buf + n, len - n, "\n");
230
231	n += scnprintf(buf + n, len - n,
232		       "OS ABI [v3]\t: no-legacy-syscalls\n");
233
234	return buf;
235}
236
237void arc_chk_ccms(void)
238{
239#if defined(CONFIG_ARC_HAS_DCCM) || defined(CONFIG_ARC_HAS_ICCM)
240	struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
241
242#ifdef CONFIG_ARC_HAS_DCCM
243	/*
244	 * DCCM can be arbit placed in hardware.
245	 * Make sure it's placement/sz matches what Linux is built with
246	 */
247	if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr)
248		panic("Linux built with incorrect DCCM Base address\n");
249
250	if (CONFIG_ARC_DCCM_SZ != cpu->dccm.sz)
251		panic("Linux built with incorrect DCCM Size\n");
252#endif
253
254#ifdef CONFIG_ARC_HAS_ICCM
255	if (CONFIG_ARC_ICCM_SZ != cpu->iccm.sz)
256		panic("Linux built with incorrect ICCM Size\n");
257#endif
258#endif
259}
260
261/*
262 * Ensure that FP hardware and kernel config match
263 * -If hardware contains DPFP, kernel needs to save/restore FPU state
264 *  across context switches
265 * -If hardware lacks DPFP, but kernel configured to save FPU state then
266 *  kernel trying to access non-existant DPFP regs will crash
267 *
268 * We only check for Dbl precision Floating Point, because only DPFP
269 * hardware has dedicated regs which need to be saved/restored on ctx-sw
270 * (Single Precision uses core regs), thus kernel is kind of oblivious to it
271 */
272void arc_chk_fpu(void)
273{
274	struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
275
276	if (cpu->dpfp.ver) {
277#ifndef CONFIG_ARC_FPU_SAVE_RESTORE
278		pr_warn("DPFP support broken in this kernel...\n");
279#endif
280	} else {
281#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
282		panic("H/w lacks DPFP support, apps won't work\n");
283#endif
284	}
285}
286
287/*
288 * Initialize and setup the processor core
289 * This is called by all the CPUs thus should not do special case stuff
290 *    such as only for boot CPU etc
291 */
292
293void setup_processor(void)
294{
295	char str[512];
296	int cpu_id = smp_processor_id();
297
298	read_arc_build_cfg_regs();
299	arc_init_IRQ();
300
301	printk(arc_cpu_mumbojumbo(cpu_id, str, sizeof(str)));
302
303	arc_mmu_init();
304	arc_cache_init();
305	arc_chk_ccms();
306
307	printk(arc_extn_mumbojumbo(cpu_id, str, sizeof(str)));
308
309#ifdef CONFIG_SMP
310	printk(arc_platform_smp_cpuinfo());
311#endif
312
313	arc_chk_fpu();
314}
315
316void __init setup_arch(char **cmdline_p)
317{
318	/* This also populates @boot_command_line from /bootargs */
319	machine_desc = setup_machine_fdt(__dtb_start);
320	if (!machine_desc)
321		panic("Embedded DT invalid\n");
322
323	/* Append any u-boot provided cmdline */
324#ifdef CONFIG_CMDLINE_UBOOT
325	/* Add a whitespace seperator between the 2 cmdlines */
326	strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
327	strlcat(boot_command_line, command_line, COMMAND_LINE_SIZE);
328#endif
329
330	/* Save unparsed command line copy for /proc/cmdline */
331	*cmdline_p = boot_command_line;
332
333	/* To force early parsing of things like mem=xxx */
334	parse_early_param();
335
336	/* Platform/board specific: e.g. early console registration */
337	if (machine_desc->init_early)
338		machine_desc->init_early();
339
340	setup_processor();
341
342#ifdef CONFIG_SMP
343	smp_init_cpus();
344#endif
345
346	setup_arch_memory();
347
348	/* copy flat DT out of .init and then unflatten it */
349	unflatten_and_copy_device_tree();
350
351	/* Can be issue if someone passes cmd line arg "ro"
352	 * But that is unlikely so keeping it as it is
353	 */
354	root_mountflags &= ~MS_RDONLY;
355
356#if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
357	conswitchp = &dummy_con;
358#endif
359
360	arc_unwind_init();
361	arc_unwind_setup();
362}
363
364static int __init customize_machine(void)
365{
366	/* Add platform devices */
367	if (machine_desc->init_machine)
368		machine_desc->init_machine();
369
370	return 0;
371}
372arch_initcall(customize_machine);
373
374static int __init init_late_machine(void)
375{
376	if (machine_desc->init_late)
377		machine_desc->init_late();
378
379	return 0;
380}
381late_initcall(init_late_machine);
382/*
383 *  Get CPU information for use by the procfs.
384 */
385
386#define cpu_to_ptr(c)	((void *)(0xFFFF0000 | (unsigned int)(c)))
387#define ptr_to_cpu(p)	(~0xFFFF0000UL & (unsigned int)(p))
388
389static int show_cpuinfo(struct seq_file *m, void *v)
390{
391	char *str;
392	int cpu_id = ptr_to_cpu(v);
393
394	str = (char *)__get_free_page(GFP_TEMPORARY);
395	if (!str)
396		goto done;
397
398	seq_printf(m, arc_cpu_mumbojumbo(cpu_id, str, PAGE_SIZE));
399
400	seq_printf(m, "Bogo MIPS : \t%lu.%02lu\n",
401		   loops_per_jiffy / (500000 / HZ),
402		   (loops_per_jiffy / (5000 / HZ)) % 100);
403
404	seq_printf(m, arc_mmu_mumbojumbo(cpu_id, str, PAGE_SIZE));
405
406	seq_printf(m, arc_cache_mumbojumbo(cpu_id, str, PAGE_SIZE));
407
408	seq_printf(m, arc_extn_mumbojumbo(cpu_id, str, PAGE_SIZE));
409
410#ifdef CONFIG_SMP
411	seq_printf(m, arc_platform_smp_cpuinfo());
412#endif
413
414	free_page((unsigned long)str);
415done:
416	seq_printf(m, "\n\n");
417
418	return 0;
419}
420
421static void *c_start(struct seq_file *m, loff_t *pos)
422{
423	/*
424	 * Callback returns cpu-id to iterator for show routine, NULL to stop.
425	 * However since NULL is also a valid cpu-id (0), we use a round-about
426	 * way to pass it w/o having to kmalloc/free a 2 byte string.
427	 * Encode cpu-id as 0xFFcccc, which is decoded by show routine.
428	 */
429	return *pos < num_possible_cpus() ? cpu_to_ptr(*pos) : NULL;
430}
431
432static void *c_next(struct seq_file *m, void *v, loff_t *pos)
433{
434	++*pos;
435	return c_start(m, pos);
436}
437
438static void c_stop(struct seq_file *m, void *v)
439{
440}
441
442const struct seq_operations cpuinfo_op = {
443	.start	= c_start,
444	.next	= c_next,
445	.stop	= c_stop,
446	.show	= show_cpuinfo
447};
448
449static DEFINE_PER_CPU(struct cpu, cpu_topology);
450
451static int __init topology_init(void)
452{
453	int cpu;
454
455	for_each_present_cpu(cpu)
456	    register_cpu(&per_cpu(cpu_topology, cpu), cpu);
457
458	return 0;
459}
460
461subsys_initcall(topology_init);
462