4 * Linux architectural port borrowing liberally from similar works of
5 * others. All original copyrights apply as per the original source
8 * Modifications for the OpenRISC architecture:
9 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
10 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
17 * This file handles the architecture-dependent parts of initialization
20 #include <linux/errno.h>
21 #include <linux/sched.h>
22 #include <linux/kernel.h>
24 #include <linux/stddef.h>
25 #include <linux/unistd.h>
26 #include <linux/ptrace.h>
27 #include <linux/slab.h>
28 #include <linux/tty.h>
29 #include <linux/ioport.h>
30 #include <linux/delay.h>
31 #include <linux/console.h>
32 #include <linux/init.h>
33 #include <linux/bootmem.h>
34 #include <linux/seq_file.h>
35 #include <linux/serial.h>
36 #include <linux/initrd.h>
37 #include <linux/of_fdt.h>
39 #include <linux/memblock.h>
40 #include <linux/device.h>
42 #include <asm/sections.h>
43 #include <asm/segment.h>
44 #include <asm/pgtable.h>
45 #include <asm/types.h>
46 #include <asm/setup.h>
48 #include <asm/cpuinfo.h>
49 #include <asm/delay.h>
53 static void __init setup_memory(void)
55 unsigned long ram_start_pfn;
56 unsigned long ram_end_pfn;
57 phys_addr_t memory_start, memory_end;
58 struct memblock_region *region;
60 memory_end = memory_start = 0;
62 /* Find main memory where is the kernel, we assume its the only one */
63 for_each_memblock(memory, region) {
64 memory_start = region->base;
65 memory_end = region->base + region->size;
66 printk(KERN_INFO "%s: Memory: 0x%x-0x%x\n", __func__,
67 memory_start, memory_end);
74 ram_start_pfn = PFN_UP(memory_start);
75 ram_end_pfn = PFN_DOWN(memblock_end_of_DRAM());
77 /* setup bootmem globals (we use no_bootmem, but mm still depends on this) */
78 min_low_pfn = ram_start_pfn;
79 max_low_pfn = ram_end_pfn;
80 max_pfn = ram_end_pfn;
83 * initialize the boot-time allocator (with low memory only).
85 * This makes the memory from the end of the kernel to the end of
88 memblock_reserve(__pa(_stext), _end - _stext);
90 early_init_fdt_reserve_self();
91 early_init_fdt_scan_reserved_mem();
96 struct cpuinfo_or1k cpuinfo_or1k[NR_CPUS];
98 static void print_cpuinfo(void)
100 unsigned long upr = mfspr(SPR_UPR);
101 unsigned long vr = mfspr(SPR_VR);
102 unsigned int version;
103 unsigned int revision;
104 struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[smp_processor_id()];
106 version = (vr & SPR_VR_VER) >> 24;
107 revision = (vr & SPR_VR_REV);
109 printk(KERN_INFO "CPU: OpenRISC-%x (revision %d) @%d MHz\n",
110 version, revision, cpuinfo->clock_frequency / 1000000);
112 if (!(upr & SPR_UPR_UP)) {
114 "-- no UPR register... unable to detect configuration\n");
118 if (upr & SPR_UPR_DCP)
120 "-- dcache: %4d bytes total, %2d bytes/line, %d way(s)\n",
121 cpuinfo->dcache_size, cpuinfo->dcache_block_size,
122 cpuinfo->dcache_ways);
124 printk(KERN_INFO "-- dcache disabled\n");
125 if (upr & SPR_UPR_ICP)
127 "-- icache: %4d bytes total, %2d bytes/line, %d way(s)\n",
128 cpuinfo->icache_size, cpuinfo->icache_block_size,
129 cpuinfo->icache_ways);
131 printk(KERN_INFO "-- icache disabled\n");
133 if (upr & SPR_UPR_DMP)
134 printk(KERN_INFO "-- dmmu: %4d entries, %lu way(s)\n",
135 1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2),
136 1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW));
137 if (upr & SPR_UPR_IMP)
138 printk(KERN_INFO "-- immu: %4d entries, %lu way(s)\n",
139 1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2),
140 1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW));
142 printk(KERN_INFO "-- additional features:\n");
143 if (upr & SPR_UPR_DUP)
144 printk(KERN_INFO "-- debug unit\n");
145 if (upr & SPR_UPR_PCUP)
146 printk(KERN_INFO "-- performance counters\n");
147 if (upr & SPR_UPR_PMP)
148 printk(KERN_INFO "-- power management\n");
149 if (upr & SPR_UPR_PICP)
150 printk(KERN_INFO "-- PIC\n");
151 if (upr & SPR_UPR_TTP)
152 printk(KERN_INFO "-- timer\n");
153 if (upr & SPR_UPR_CUP)
154 printk(KERN_INFO "-- custom unit(s)\n");
157 static struct device_node *setup_find_cpu_node(int cpu)
160 struct device_node *cpun;
162 for_each_of_cpu_node(cpun) {
163 if (of_property_read_u32(cpun, "reg", &hwid))
172 void __init setup_cpuinfo(void)
174 struct device_node *cpu;
175 unsigned long iccfgr, dccfgr;
176 unsigned long cache_set_size;
177 int cpu_id = smp_processor_id();
178 struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[cpu_id];
180 cpu = setup_find_cpu_node(cpu_id);
182 panic("Couldn't find CPU%d in device tree...\n", cpu_id);
184 iccfgr = mfspr(SPR_ICCFGR);
185 cpuinfo->icache_ways = 1 << (iccfgr & SPR_ICCFGR_NCW);
186 cache_set_size = 1 << ((iccfgr & SPR_ICCFGR_NCS) >> 3);
187 cpuinfo->icache_block_size = 16 << ((iccfgr & SPR_ICCFGR_CBS) >> 7);
188 cpuinfo->icache_size =
189 cache_set_size * cpuinfo->icache_ways * cpuinfo->icache_block_size;
191 dccfgr = mfspr(SPR_DCCFGR);
192 cpuinfo->dcache_ways = 1 << (dccfgr & SPR_DCCFGR_NCW);
193 cache_set_size = 1 << ((dccfgr & SPR_DCCFGR_NCS) >> 3);
194 cpuinfo->dcache_block_size = 16 << ((dccfgr & SPR_DCCFGR_CBS) >> 7);
195 cpuinfo->dcache_size =
196 cache_set_size * cpuinfo->dcache_ways * cpuinfo->dcache_block_size;
198 if (of_property_read_u32(cpu, "clock-frequency",
199 &cpuinfo->clock_frequency)) {
201 "Device tree missing CPU 'clock-frequency' parameter."
202 "Assuming frequency 25MHZ"
203 "This is probably not what you want.");
206 cpuinfo->coreid = mfspr(SPR_COREID);
216 * Handles the pointer to the device tree that this kernel is to use
217 * for establishing the available platform devices.
219 * Falls back on built-in device tree in case null pointer is passed.
222 void __init or32_early_setup(void *fdt)
225 pr_info("FDT at %p\n", fdt);
228 pr_info("Compiled-in FDT at %p\n", fdt);
230 early_init_devtree(fdt);
233 static inline unsigned long extract_value_bits(unsigned long reg,
234 short bit_nr, short width)
236 return (reg >> bit_nr) & (0 << width);
239 static inline unsigned long extract_value(unsigned long reg, unsigned long mask)
241 while (!(mask & 0x1)) {
248 void __init detect_unit_config(unsigned long upr, unsigned long mask,
249 char *text, void (*func) (void))
260 printk("not present\n");
266 * Lightweight calibrate_delay implementation that calculates loops_per_jiffy
267 * from the clock frequency passed in via the device tree
271 void calibrate_delay(void)
274 struct device_node *cpu = setup_find_cpu_node(smp_processor_id());
276 val = of_get_property(cpu, "clock-frequency", NULL);
278 panic("no cpu 'clock-frequency' parameter in device tree");
279 loops_per_jiffy = *val / HZ;
280 pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
281 loops_per_jiffy / (500000 / HZ),
282 (loops_per_jiffy / (5000 / HZ)) % 100, loops_per_jiffy);
285 void __init setup_arch(char **cmdline_p)
287 unflatten_and_copy_device_tree();
295 /* process 1's initial memory region is the kernel code/data */
296 init_mm.start_code = (unsigned long)_stext;
297 init_mm.end_code = (unsigned long)_etext;
298 init_mm.end_data = (unsigned long)_edata;
299 init_mm.brk = (unsigned long)_end;
301 #ifdef CONFIG_BLK_DEV_INITRD
302 initrd_start = (unsigned long)&__initrd_start;
303 initrd_end = (unsigned long)&__initrd_end;
304 if (initrd_start == initrd_end) {
308 initrd_below_start_ok = 1;
311 /* setup memblock allocator */
314 /* paging_init() sets up the MMU and marks all pages as reserved */
317 #if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
319 conswitchp = &dummy_con;
322 *cmdline_p = boot_command_line;
324 printk(KERN_INFO "OpenRISC Linux -- http://openrisc.io\n");
327 static int show_cpuinfo(struct seq_file *m, void *v)
329 unsigned int vr, cpucfgr;
331 unsigned int version;
332 struct cpuinfo_or1k *cpuinfo = v;
335 cpucfgr = mfspr(SPR_CPUCFGR);
338 seq_printf(m, "processor\t\t: %d\n", cpuinfo->coreid);
340 if (vr & SPR_VR_UVRP) {
342 version = vr & SPR_VR2_VER;
343 avr = mfspr(SPR_AVR);
344 seq_printf(m, "cpu architecture\t: "
345 "OpenRISC 1000 (%d.%d-rev%d)\n",
349 seq_printf(m, "cpu implementation id\t: 0x%x\n",
350 (vr & SPR_VR2_CPUID) >> 24);
351 seq_printf(m, "cpu version\t\t: 0x%x\n", version);
353 version = (vr & SPR_VR_VER) >> 24;
354 seq_printf(m, "cpu\t\t\t: OpenRISC-%x\n", version);
355 seq_printf(m, "revision\t\t: %d\n", vr & SPR_VR_REV);
357 seq_printf(m, "frequency\t\t: %ld\n", loops_per_jiffy * HZ);
358 seq_printf(m, "dcache size\t\t: %d bytes\n", cpuinfo->dcache_size);
359 seq_printf(m, "dcache block size\t: %d bytes\n",
360 cpuinfo->dcache_block_size);
361 seq_printf(m, "dcache ways\t\t: %d\n", cpuinfo->dcache_ways);
362 seq_printf(m, "icache size\t\t: %d bytes\n", cpuinfo->icache_size);
363 seq_printf(m, "icache block size\t: %d bytes\n",
364 cpuinfo->icache_block_size);
365 seq_printf(m, "icache ways\t\t: %d\n", cpuinfo->icache_ways);
366 seq_printf(m, "immu\t\t\t: %d entries, %lu ways\n",
367 1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2),
368 1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW));
369 seq_printf(m, "dmmu\t\t\t: %d entries, %lu ways\n",
370 1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2),
371 1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW));
372 seq_printf(m, "bogomips\t\t: %lu.%02lu\n",
373 (loops_per_jiffy * HZ) / 500000,
374 ((loops_per_jiffy * HZ) / 5000) % 100);
376 seq_puts(m, "features\t\t: ");
377 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OB32S ? "orbis32" : "");
378 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OB64S ? "orbis64" : "");
379 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OF32S ? "orfpx32" : "");
380 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OF64S ? "orfpx64" : "");
381 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OV64S ? "orvdx64" : "");
389 static void *c_start(struct seq_file *m, loff_t *pos)
391 *pos = cpumask_next(*pos - 1, cpu_online_mask);
392 if ((*pos) < nr_cpu_ids)
393 return &cpuinfo_or1k[*pos];
397 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
400 return c_start(m, pos);
403 static void c_stop(struct seq_file *m, void *v)
407 const struct seq_operations cpuinfo_op = {
411 .show = show_cpuinfo,