261 lines
5.8 KiB
C
261 lines
5.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* arch/sh/kernel/cpu/sh4/probe.c
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*
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* CPU Subtype Probing for SH-4.
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*
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* Copyright (C) 2001 - 2007 Paul Mundt
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* Copyright (C) 2003 Richard Curnow
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*/
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#include <linux/init.h>
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#include <linux/io.h>
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#include <asm/processor.h>
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#include <asm/cache.h>
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void cpu_probe(void)
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{
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unsigned long pvr, prr, cvr;
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unsigned long size;
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static unsigned long sizes[16] = {
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[1] = (1 << 12),
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[2] = (1 << 13),
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[4] = (1 << 14),
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[8] = (1 << 15),
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[9] = (1 << 16)
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};
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pvr = (__raw_readl(CCN_PVR) >> 8) & 0xffffff;
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prr = (__raw_readl(CCN_PRR) >> 4) & 0xff;
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cvr = (__raw_readl(CCN_CVR));
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/*
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* Setup some sane SH-4 defaults for the icache
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*/
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boot_cpu_data.icache.way_incr = (1 << 13);
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boot_cpu_data.icache.entry_shift = 5;
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boot_cpu_data.icache.sets = 256;
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boot_cpu_data.icache.ways = 1;
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boot_cpu_data.icache.linesz = L1_CACHE_BYTES;
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/*
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* And again for the dcache ..
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*/
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boot_cpu_data.dcache.way_incr = (1 << 14);
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boot_cpu_data.dcache.entry_shift = 5;
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boot_cpu_data.dcache.sets = 512;
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boot_cpu_data.dcache.ways = 1;
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boot_cpu_data.dcache.linesz = L1_CACHE_BYTES;
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/* We don't know the chip cut */
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boot_cpu_data.cut_major = boot_cpu_data.cut_minor = -1;
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/*
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* Setup some generic flags we can probe on SH-4A parts
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*/
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if (((pvr >> 16) & 0xff) == 0x10) {
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boot_cpu_data.family = CPU_FAMILY_SH4A;
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if ((cvr & 0x10000000) == 0) {
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boot_cpu_data.flags |= CPU_HAS_DSP;
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boot_cpu_data.family = CPU_FAMILY_SH4AL_DSP;
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}
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boot_cpu_data.flags |= CPU_HAS_LLSC | CPU_HAS_PERF_COUNTER;
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boot_cpu_data.cut_major = pvr & 0x7f;
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boot_cpu_data.icache.ways = 4;
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boot_cpu_data.dcache.ways = 4;
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} else {
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/* And some SH-4 defaults.. */
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boot_cpu_data.flags |= CPU_HAS_PTEA | CPU_HAS_FPU;
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boot_cpu_data.family = CPU_FAMILY_SH4;
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}
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/* FPU detection works for almost everyone */
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if ((cvr & 0x20000000))
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boot_cpu_data.flags |= CPU_HAS_FPU;
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/* Mask off the upper chip ID */
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pvr &= 0xffff;
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/*
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* Probe the underlying processor version/revision and
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* adjust cpu_data setup accordingly.
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*/
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switch (pvr) {
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case 0x205:
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boot_cpu_data.type = CPU_SH7750;
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boot_cpu_data.flags |= CPU_HAS_P2_FLUSH_BUG |
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CPU_HAS_PERF_COUNTER;
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break;
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case 0x206:
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boot_cpu_data.type = CPU_SH7750S;
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boot_cpu_data.flags |= CPU_HAS_P2_FLUSH_BUG |
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CPU_HAS_PERF_COUNTER;
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break;
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case 0x1100:
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boot_cpu_data.type = CPU_SH7751;
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break;
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case 0x2001:
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case 0x2004:
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boot_cpu_data.type = CPU_SH7770;
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break;
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case 0x2006:
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case 0x200A:
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if (prr == 0x61)
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boot_cpu_data.type = CPU_SH7781;
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else if (prr == 0xa1)
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boot_cpu_data.type = CPU_SH7763;
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else
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boot_cpu_data.type = CPU_SH7780;
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break;
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case 0x3000:
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case 0x3003:
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case 0x3009:
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boot_cpu_data.type = CPU_SH7343;
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break;
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case 0x3004:
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case 0x3007:
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boot_cpu_data.type = CPU_SH7785;
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break;
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case 0x4004:
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case 0x4005:
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boot_cpu_data.type = CPU_SH7786;
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boot_cpu_data.flags |= CPU_HAS_PTEAEX | CPU_HAS_L2_CACHE;
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break;
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case 0x3008:
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switch (prr) {
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case 0x50:
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case 0x51:
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boot_cpu_data.type = CPU_SH7723;
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boot_cpu_data.flags |= CPU_HAS_L2_CACHE;
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break;
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case 0x70:
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boot_cpu_data.type = CPU_SH7366;
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break;
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case 0xa0:
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case 0xa1:
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boot_cpu_data.type = CPU_SH7722;
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break;
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}
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break;
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case 0x300b:
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switch (prr) {
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case 0x20:
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boot_cpu_data.type = CPU_SH7724;
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boot_cpu_data.flags |= CPU_HAS_L2_CACHE;
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break;
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case 0x10:
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case 0x11:
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boot_cpu_data.type = CPU_SH7757;
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break;
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case 0xd0:
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case 0x40: /* yon-ten-go */
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boot_cpu_data.type = CPU_SH7372;
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break;
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case 0xE0: /* 0x4E0 */
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boot_cpu_data.type = CPU_SH7734; /* SH7733/SH7734 */
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break;
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}
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break;
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case 0x4000: /* 1st cut */
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case 0x4001: /* 2nd cut */
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boot_cpu_data.type = CPU_SHX3;
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break;
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case 0x700:
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boot_cpu_data.type = CPU_SH4_501;
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boot_cpu_data.flags &= ~CPU_HAS_FPU;
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boot_cpu_data.icache.ways = 2;
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boot_cpu_data.dcache.ways = 2;
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break;
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case 0x600:
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boot_cpu_data.type = CPU_SH4_202;
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boot_cpu_data.icache.ways = 2;
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boot_cpu_data.dcache.ways = 2;
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break;
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case 0x500 ... 0x501:
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switch (prr) {
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case 0x10:
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boot_cpu_data.type = CPU_SH7750R;
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break;
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case 0x11:
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boot_cpu_data.type = CPU_SH7751R;
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break;
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case 0x50 ... 0x5f:
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boot_cpu_data.type = CPU_SH7760;
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break;
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}
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boot_cpu_data.icache.ways = 2;
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boot_cpu_data.dcache.ways = 2;
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break;
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}
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/*
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* On anything that's not a direct-mapped cache, look to the CVR
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* for I/D-cache specifics.
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*/
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if (boot_cpu_data.icache.ways > 1) {
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size = sizes[(cvr >> 20) & 0xf];
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boot_cpu_data.icache.way_incr = (size >> 1);
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boot_cpu_data.icache.sets = (size >> 6);
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}
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/* And the rest of the D-cache */
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if (boot_cpu_data.dcache.ways > 1) {
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size = sizes[(cvr >> 16) & 0xf];
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boot_cpu_data.dcache.way_incr = (size >> 1);
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boot_cpu_data.dcache.sets = (size >> 6);
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}
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/*
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* SH-4A's have an optional PIPT L2.
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*/
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if (boot_cpu_data.flags & CPU_HAS_L2_CACHE) {
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/*
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* Verify that it really has something hooked up, this
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* is the safety net for CPUs that have optional L2
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* support yet do not implement it.
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*/
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if ((cvr & 0xf) == 0)
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boot_cpu_data.flags &= ~CPU_HAS_L2_CACHE;
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else {
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/*
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* Silicon and specifications have clearly never
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* met..
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*/
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cvr ^= 0xf;
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/*
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* Size calculation is much more sensible
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* than it is for the L1.
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*
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* Sizes are 128KB, 256KB, 512KB, and 1MB.
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*/
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size = (cvr & 0xf) << 17;
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boot_cpu_data.scache.way_incr = (1 << 16);
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boot_cpu_data.scache.entry_shift = 5;
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boot_cpu_data.scache.ways = 4;
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boot_cpu_data.scache.linesz = L1_CACHE_BYTES;
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boot_cpu_data.scache.entry_mask =
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(boot_cpu_data.scache.way_incr -
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boot_cpu_data.scache.linesz);
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boot_cpu_data.scache.sets = size /
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(boot_cpu_data.scache.linesz *
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boot_cpu_data.scache.ways);
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boot_cpu_data.scache.way_size =
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(boot_cpu_data.scache.sets *
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boot_cpu_data.scache.linesz);
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}
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}
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}
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