1*b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0
21da177e4SLinus Torvalds /*
31da177e4SLinus Torvalds * sc-ip22.c: Indy cache management functions.
41da177e4SLinus Torvalds *
51da177e4SLinus Torvalds * Copyright (C) 1997, 2001 Ralf Baechle (ralf@gnu.org),
679add627SJustin P. Mattock * derived from r4xx0.c by David S. Miller (davem@davemloft.net).
71da177e4SLinus Torvalds */
81da177e4SLinus Torvalds #include <linux/init.h>
91da177e4SLinus Torvalds #include <linux/kernel.h>
101da177e4SLinus Torvalds #include <linux/sched.h>
111da177e4SLinus Torvalds #include <linux/mm.h>
121da177e4SLinus Torvalds
131da177e4SLinus Torvalds #include <asm/bcache.h>
141da177e4SLinus Torvalds #include <asm/page.h>
151da177e4SLinus Torvalds #include <asm/bootinfo.h>
161da177e4SLinus Torvalds #include <asm/sgi/ip22.h>
171da177e4SLinus Torvalds #include <asm/sgi/mc.h>
181da177e4SLinus Torvalds
191da177e4SLinus Torvalds /* Secondary cache size in bytes, if present. */
201da177e4SLinus Torvalds static unsigned long scache_size;
211da177e4SLinus Torvalds
221da177e4SLinus Torvalds #undef DEBUG_CACHE
231da177e4SLinus Torvalds
241da177e4SLinus Torvalds #define SC_SIZE 0x00080000
251da177e4SLinus Torvalds #define SC_LINE 32
261da177e4SLinus Torvalds #define CI_MASK (SC_SIZE - SC_LINE)
271da177e4SLinus Torvalds #define SC_INDEX(n) ((n) & CI_MASK)
281da177e4SLinus Torvalds
indy_sc_wipe(unsigned long first,unsigned long last)291da177e4SLinus Torvalds static inline void indy_sc_wipe(unsigned long first, unsigned long last)
301da177e4SLinus Torvalds {
311da177e4SLinus Torvalds unsigned long tmp;
321da177e4SLinus Torvalds
331da177e4SLinus Torvalds __asm__ __volatile__(
34f9f1c8dbSRalf Baechle " .set push # indy_sc_wipe \n"
35f9f1c8dbSRalf Baechle " .set noreorder \n"
36f9f1c8dbSRalf Baechle " .set mips3 \n"
37f9f1c8dbSRalf Baechle " .set noat \n"
38f9f1c8dbSRalf Baechle " mfc0 %2, $12 \n"
39f9f1c8dbSRalf Baechle " li $1, 0x80 # Go 64 bit \n"
40f9f1c8dbSRalf Baechle " mtc0 $1, $12 \n"
41f9f1c8dbSRalf Baechle " \n"
42ae2f5e5eSRalf Baechle " # \n"
43ae2f5e5eSRalf Baechle " # Open code a dli $1, 0x9000000080000000 \n"
44ae2f5e5eSRalf Baechle " # \n"
45ae2f5e5eSRalf Baechle " # Required because binutils 2.25 will happily accept \n"
46ae2f5e5eSRalf Baechle " # 64 bit instructions in .set mips3 mode but puke on \n"
47ae2f5e5eSRalf Baechle " # 64 bit constants when generating 32 bit ELF \n"
48ae2f5e5eSRalf Baechle " # \n"
49ae2f5e5eSRalf Baechle " lui $1,0x9000 \n"
50ae2f5e5eSRalf Baechle " dsll $1,$1,0x10 \n"
51ae2f5e5eSRalf Baechle " ori $1,$1,0x8000 \n"
52ae2f5e5eSRalf Baechle " dsll $1,$1,0x10 \n"
53ae2f5e5eSRalf Baechle " \n"
54f9f1c8dbSRalf Baechle " or %0, $1 # first line to flush \n"
55f9f1c8dbSRalf Baechle " or %1, $1 # last line to flush \n"
56f9f1c8dbSRalf Baechle " .set at \n"
57f9f1c8dbSRalf Baechle " \n"
58f9f1c8dbSRalf Baechle "1: sw $0, 0(%0) \n"
59f9f1c8dbSRalf Baechle " bne %0, %1, 1b \n"
60f9f1c8dbSRalf Baechle " daddu %0, 32 \n"
61f9f1c8dbSRalf Baechle " \n"
62f9f1c8dbSRalf Baechle " mtc0 %2, $12 # Back to 32 bit \n"
63f9f1c8dbSRalf Baechle " nop # pipeline hazard \n"
64f9f1c8dbSRalf Baechle " nop \n"
65f9f1c8dbSRalf Baechle " nop \n"
66f9f1c8dbSRalf Baechle " nop \n"
67f9f1c8dbSRalf Baechle " .set pop \n"
681da177e4SLinus Torvalds : "=r" (first), "=r" (last), "=&r" (tmp)
691da177e4SLinus Torvalds : "0" (first), "1" (last));
701da177e4SLinus Torvalds }
711da177e4SLinus Torvalds
indy_sc_wback_invalidate(unsigned long addr,unsigned long size)721da177e4SLinus Torvalds static void indy_sc_wback_invalidate(unsigned long addr, unsigned long size)
731da177e4SLinus Torvalds {
741da177e4SLinus Torvalds unsigned long first_line, last_line;
751da177e4SLinus Torvalds unsigned long flags;
761da177e4SLinus Torvalds
771da177e4SLinus Torvalds #ifdef DEBUG_CACHE
781da177e4SLinus Torvalds printk("indy_sc_wback_invalidate[%08lx,%08lx]", addr, size);
791da177e4SLinus Torvalds #endif
801da177e4SLinus Torvalds
811da177e4SLinus Torvalds /* Catch bad driver code */
821da177e4SLinus Torvalds BUG_ON(size == 0);
831da177e4SLinus Torvalds
841da177e4SLinus Torvalds /* Which lines to flush? */
851da177e4SLinus Torvalds first_line = SC_INDEX(addr);
861da177e4SLinus Torvalds last_line = SC_INDEX(addr + size - 1);
871da177e4SLinus Torvalds
881da177e4SLinus Torvalds local_irq_save(flags);
891da177e4SLinus Torvalds if (first_line <= last_line) {
901da177e4SLinus Torvalds indy_sc_wipe(first_line, last_line);
911da177e4SLinus Torvalds goto out;
921da177e4SLinus Torvalds }
931da177e4SLinus Torvalds
941da177e4SLinus Torvalds indy_sc_wipe(first_line, SC_SIZE - SC_LINE);
951da177e4SLinus Torvalds indy_sc_wipe(0, last_line);
961da177e4SLinus Torvalds out:
971da177e4SLinus Torvalds local_irq_restore(flags);
981da177e4SLinus Torvalds }
991da177e4SLinus Torvalds
indy_sc_enable(void)1001da177e4SLinus Torvalds static void indy_sc_enable(void)
1011da177e4SLinus Torvalds {
1021da177e4SLinus Torvalds unsigned long addr, tmp1, tmp2;
1031da177e4SLinus Torvalds
1041da177e4SLinus Torvalds /* This is really cool... */
1051da177e4SLinus Torvalds #ifdef DEBUG_CACHE
1061da177e4SLinus Torvalds printk("Enabling R4600 SCACHE\n");
1071da177e4SLinus Torvalds #endif
1081da177e4SLinus Torvalds __asm__ __volatile__(
1091da177e4SLinus Torvalds ".set\tpush\n\t"
1101da177e4SLinus Torvalds ".set\tnoreorder\n\t"
1111da177e4SLinus Torvalds ".set\tmips3\n\t"
1121da177e4SLinus Torvalds "mfc0\t%2, $12\n\t"
1131da177e4SLinus Torvalds "nop; nop; nop; nop;\n\t"
1141da177e4SLinus Torvalds "li\t%1, 0x80\n\t"
1151da177e4SLinus Torvalds "mtc0\t%1, $12\n\t"
1161da177e4SLinus Torvalds "nop; nop; nop; nop;\n\t"
1171da177e4SLinus Torvalds "li\t%0, 0x1\n\t"
1181da177e4SLinus Torvalds "dsll\t%0, 31\n\t"
1191da177e4SLinus Torvalds "lui\t%1, 0x9000\n\t"
1201da177e4SLinus Torvalds "dsll32\t%1, 0\n\t"
1211da177e4SLinus Torvalds "or\t%0, %1, %0\n\t"
1221da177e4SLinus Torvalds "sb\t$0, 0(%0)\n\t"
1231da177e4SLinus Torvalds "mtc0\t$0, $12\n\t"
1241da177e4SLinus Torvalds "nop; nop; nop; nop;\n\t"
1251da177e4SLinus Torvalds "mtc0\t%2, $12\n\t"
1261da177e4SLinus Torvalds "nop; nop; nop; nop;\n\t"
1271da177e4SLinus Torvalds ".set\tpop"
1281da177e4SLinus Torvalds : "=r" (tmp1), "=r" (tmp2), "=r" (addr));
1291da177e4SLinus Torvalds }
1301da177e4SLinus Torvalds
indy_sc_disable(void)1311da177e4SLinus Torvalds static void indy_sc_disable(void)
1321da177e4SLinus Torvalds {
1331da177e4SLinus Torvalds unsigned long tmp1, tmp2, tmp3;
1341da177e4SLinus Torvalds
1351da177e4SLinus Torvalds #ifdef DEBUG_CACHE
1361da177e4SLinus Torvalds printk("Disabling R4600 SCACHE\n");
1371da177e4SLinus Torvalds #endif
1381da177e4SLinus Torvalds __asm__ __volatile__(
1391da177e4SLinus Torvalds ".set\tpush\n\t"
1401da177e4SLinus Torvalds ".set\tnoreorder\n\t"
1411da177e4SLinus Torvalds ".set\tmips3\n\t"
1421da177e4SLinus Torvalds "li\t%0, 0x1\n\t"
1431da177e4SLinus Torvalds "dsll\t%0, 31\n\t"
1441da177e4SLinus Torvalds "lui\t%1, 0x9000\n\t"
1451da177e4SLinus Torvalds "dsll32\t%1, 0\n\t"
1461da177e4SLinus Torvalds "or\t%0, %1, %0\n\t"
1471da177e4SLinus Torvalds "mfc0\t%2, $12\n\t"
1481da177e4SLinus Torvalds "nop; nop; nop; nop\n\t"
1491da177e4SLinus Torvalds "li\t%1, 0x80\n\t"
1501da177e4SLinus Torvalds "mtc0\t%1, $12\n\t"
1511da177e4SLinus Torvalds "nop; nop; nop; nop\n\t"
1521da177e4SLinus Torvalds "sh\t$0, 0(%0)\n\t"
1531da177e4SLinus Torvalds "mtc0\t$0, $12\n\t"
1541da177e4SLinus Torvalds "nop; nop; nop; nop\n\t"
1551da177e4SLinus Torvalds "mtc0\t%2, $12\n\t"
1561da177e4SLinus Torvalds "nop; nop; nop; nop\n\t"
1571da177e4SLinus Torvalds ".set\tpop"
1581da177e4SLinus Torvalds : "=r" (tmp1), "=r" (tmp2), "=r" (tmp3));
1591da177e4SLinus Torvalds }
1601da177e4SLinus Torvalds
indy_sc_probe(void)1611da177e4SLinus Torvalds static inline int __init indy_sc_probe(void)
1621da177e4SLinus Torvalds {
1631da177e4SLinus Torvalds unsigned int size = ip22_eeprom_read(&sgimc->eeprom, 17);
1641da177e4SLinus Torvalds if (size == 0)
1651da177e4SLinus Torvalds return 0;
1661da177e4SLinus Torvalds
1671da177e4SLinus Torvalds size <<= PAGE_SHIFT;
1681da177e4SLinus Torvalds printk(KERN_INFO "R4600/R5000 SCACHE size %dK, linesize 32 bytes.\n",
1691da177e4SLinus Torvalds size >> 10);
1701da177e4SLinus Torvalds scache_size = size;
1711da177e4SLinus Torvalds
1721da177e4SLinus Torvalds return 1;
1731da177e4SLinus Torvalds }
1741da177e4SLinus Torvalds
17592a76f6dSAdam Buchbinder /* XXX Check with wje if the Indy caches can differentiate between
1761da177e4SLinus Torvalds writeback + invalidate and just invalidate. */
177f43909dfSDmitri Vorobiev static struct bcache_ops indy_sc_ops = {
1781da177e4SLinus Torvalds .bc_enable = indy_sc_enable,
1791da177e4SLinus Torvalds .bc_disable = indy_sc_disable,
1801da177e4SLinus Torvalds .bc_wback_inv = indy_sc_wback_invalidate,
1811da177e4SLinus Torvalds .bc_inv = indy_sc_wback_invalidate
1821da177e4SLinus Torvalds };
1831da177e4SLinus Torvalds
indy_sc_init(void)184078a55fcSPaul Gortmaker void indy_sc_init(void)
1851da177e4SLinus Torvalds {
1861da177e4SLinus Torvalds if (indy_sc_probe()) {
1871da177e4SLinus Torvalds indy_sc_enable();
1881da177e4SLinus Torvalds bcops = &indy_sc_ops;
1891da177e4SLinus Torvalds }
1901da177e4SLinus Torvalds }
191