1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * arch/sh/kernel/cpu/sh2/probe.c
4 *
5 * CPU Subtype Probing for SH-2.
6 *
7 * Copyright (C) 2002 Paul Mundt
8 */
9 #include <linux/init.h>
10 #include <linux/of_fdt.h>
11 #include <linux/smp.h>
12 #include <linux/io.h>
13 #include <asm/processor.h>
14 #include <asm/cache.h>
15
16 #if defined(CONFIG_CPU_J2)
17 extern u32 __iomem *j2_ccr_base;
18 static int __init scan_cache(unsigned long node, const char *uname,
19 int depth, void *data)
20 {
21 if (!of_flat_dt_is_compatible(node, "jcore,cache"))
22 return 0;
23
24 j2_ccr_base = ioremap(of_flat_dt_translate_address(node), 4);
25
26 return 1;
27 }
28 #endif
29
30 void __ref cpu_probe(void)
31 {
32 #if defined(CONFIG_CPU_SUBTYPE_SH7619)
33 boot_cpu_data.type = CPU_SH7619;
34 boot_cpu_data.dcache.ways = 4;
35 boot_cpu_data.dcache.way_incr = (1<<12);
36 boot_cpu_data.dcache.sets = 256;
37 boot_cpu_data.dcache.entry_shift = 4;
38 boot_cpu_data.dcache.linesz = L1_CACHE_BYTES;
39 boot_cpu_data.dcache.flags = 0;
40 #endif
41
42 #if defined(CONFIG_CPU_J2)
43 #if defined(CONFIG_SMP)
44 unsigned cpu = hard_smp_processor_id();
45 #else
46 unsigned cpu = 0;
47 #endif
48 if (cpu == 0) of_scan_flat_dt(scan_cache, NULL);
49 if (j2_ccr_base) __raw_writel(0x80000303, j2_ccr_base + 4*cpu);
50 if (cpu != 0) return;
51 boot_cpu_data.type = CPU_J2;
52
53 /* These defaults are appropriate for the original/current
54 * J2 cache. Once there is a proper framework for getting cache
55 * info from device tree, we should switch to that. */
56 boot_cpu_data.dcache.ways = 1;
57 boot_cpu_data.dcache.sets = 256;
58 boot_cpu_data.dcache.entry_shift = 5;
59 boot_cpu_data.dcache.linesz = 32;
60 boot_cpu_data.dcache.flags = 0;
61
62 boot_cpu_data.flags |= CPU_HAS_CAS_L;
63 #else
64 /*
65 * SH-2 doesn't have separate caches
66 */
67 boot_cpu_data.dcache.flags |= SH_CACHE_COMBINED;
68 #endif
69 boot_cpu_data.icache = boot_cpu_data.dcache;
70 boot_cpu_data.family = CPU_FAMILY_SH2;
71 }
72
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.