patch-2.4.22 linux-2.4.22/arch/mips/sgi-ip22/ip22-sc.c
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- Lines: 226
- Date:
1969-12-31 16:00:00.000000000 -0800
- Orig file:
linux-2.4.21/arch/mips/sgi-ip22/ip22-sc.c
- Orig date:
2002-11-28 15:53:10.000000000 -0800
diff -urN linux-2.4.21/arch/mips/sgi-ip22/ip22-sc.c linux-2.4.22/arch/mips/sgi-ip22/ip22-sc.c
@@ -1,225 +0,0 @@
-/*
- * ip22-sc.c: Indy cache management functions.
- *
- * Copyright (C) 1997, 2001 Ralf Baechle (ralf@gnu.org),
- * derived from r4xx0.c by David S. Miller (dm@engr.sgi.com).
- */
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/mm.h>
-
-#include <asm/bcache.h>
-#include <asm/sgi/sgi.h>
-#include <asm/sgi/sgimc.h>
-#include <asm/page.h>
-#include <asm/pgtable.h>
-#include <asm/system.h>
-#include <asm/bootinfo.h>
-#include <asm/sgialib.h>
-#include <asm/mmu_context.h>
-
-/* Secondary cache size in bytes, if present. */
-static unsigned long scache_size;
-
-#undef DEBUG_CACHE
-
-#define SC_SIZE 0x00080000
-#define SC_LINE 32
-#define CI_MASK (SC_SIZE - SC_LINE)
-#define SC_INDEX(n) ((n) & CI_MASK)
-
-static inline void indy_sc_wipe(unsigned long first, unsigned long last)
-{
- unsigned long tmp;
-
- __asm__ __volatile__(
- ".set\tpush\t\t\t# indy_sc_wipe\n\t"
- ".set\tnoreorder\n\t"
- ".set\tmips3\n\t"
- ".set\tnoat\n\t"
- "mfc0\t%2, $12\n\t"
- "li\t$1, 0x80\t\t\t# Go 64 bit\n\t"
- "mtc0\t$1, $12\n\t"
-
- "dli\t$1, 0x9000000080000000\n\t"
- "or\t%0, $1\t\t\t# first line to flush\n\t"
- "or\t%1, $1\t\t\t# last line to flush\n\t"
- ".set\tat\n\t"
-
- "1:\tsw\t$0, 0(%0)\n\t"
- "bne\t%0, %1, 1b\n\t"
- " daddu\t%0, 32\n\t"
-
- "mtc0\t%2, $12\t\t\t# Back to 32 bit\n\t"
- "nop; nop; nop; nop;\n\t"
- ".set\tpop"
- : "=r" (first), "=r" (last), "=&r" (tmp)
- : "0" (first), "1" (last));
-}
-
-static void indy_sc_wback_invalidate(unsigned long addr, unsigned long size)
-{
- unsigned long first_line, last_line;
- unsigned int flags;
-
-#ifdef DEBUG_CACHE
- printk("indy_sc_wback_invalidate[%08lx,%08lx]", addr, size);
-#endif
-
- if (!size)
- return;
-
- /* Which lines to flush? */
- first_line = SC_INDEX(addr);
- last_line = SC_INDEX(addr + size - 1);
-
- __save_and_cli(flags);
- if (first_line <= last_line) {
- indy_sc_wipe(first_line, last_line);
- goto out;
- }
-
- indy_sc_wipe(first_line, SC_SIZE - SC_LINE);
- indy_sc_wipe(0, last_line);
-out:
- __restore_flags(flags);
-}
-
-static void indy_sc_enable(void)
-{
- unsigned long addr, tmp1, tmp2;
-
- /* This is really cool... */
-#ifdef DEBUG_CACHE
- printk("Enabling R4600 SCACHE\n");
-#endif
- __asm__ __volatile__(
- ".set\tpush\n\t"
- ".set\tnoreorder\n\t"
- ".set\tmips3\n\t"
- "mfc0\t%2, $12\n\t"
- "nop; nop; nop; nop;\n\t"
- "li\t%1, 0x80\n\t"
- "mtc0\t%1, $12\n\t"
- "nop; nop; nop; nop;\n\t"
- "li\t%0, 0x1\n\t"
- "dsll\t%0, 31\n\t"
- "lui\t%1, 0x9000\n\t"
- "dsll32\t%1, 0\n\t"
- "or\t%0, %1, %0\n\t"
- "sb\t$0, 0(%0)\n\t"
- "mtc0\t$0, $12\n\t"
- "nop; nop; nop; nop;\n\t"
- "mtc0\t%2, $12\n\t"
- "nop; nop; nop; nop;\n\t"
- ".set\tpop"
- : "=r" (tmp1), "=r" (tmp2), "=r" (addr));
-}
-
-static void indy_sc_disable(void)
-{
- unsigned long tmp1, tmp2, tmp3;
-
-#ifdef DEBUG_CACHE
- printk("Disabling R4600 SCACHE\n");
-#endif
- __asm__ __volatile__(
- ".set\tpush\n\t"
- ".set\tnoreorder\n\t"
- ".set\tmips3\n\t"
- "li\t%0, 0x1\n\t"
- "dsll\t%0, 31\n\t"
- "lui\t%1, 0x9000\n\t"
- "dsll32\t%1, 0\n\t"
- "or\t%0, %1, %0\n\t"
- "mfc0\t%2, $12\n\t"
- "nop; nop; nop; nop\n\t"
- "li\t%1, 0x80\n\t"
- "mtc0\t%1, $12\n\t"
- "nop; nop; nop; nop\n\t"
- "sh\t$0, 0(%0)\n\t"
- "mtc0\t$0, $12\n\t"
- "nop; nop; nop; nop\n\t"
- "mtc0\t%2, $12\n\t"
- "nop; nop; nop; nop\n\t"
- ".set\tpop"
- : "=r" (tmp1), "=r" (tmp2), "=r" (tmp3));
-}
-
-static inline int __init indy_sc_probe(void)
-{
- volatile unsigned int *cpu_control;
- unsigned short cmd = 0xc220;
- unsigned long data = 0;
- int i, n;
-
-#ifdef __MIPSEB__
- cpu_control = (volatile unsigned int *) KSEG1ADDR(0x1fa00034);
-#else
- cpu_control = (volatile unsigned int *) KSEG1ADDR(0x1fa00030);
-#endif
-#define DEASSERT(bit) (*(cpu_control) &= (~(bit)))
-#define ASSERT(bit) (*(cpu_control) |= (bit))
-#define DELAY for(n = 0; n < 100000; n++) __asm__ __volatile__("")
- DEASSERT(SGIMC_EEPROM_PRE);
- DEASSERT(SGIMC_EEPROM_SDATAO);
- DEASSERT(SGIMC_EEPROM_SECLOCK);
- DEASSERT(SGIMC_EEPROM_PRE);
- DELAY;
- ASSERT(SGIMC_EEPROM_CSEL); ASSERT(SGIMC_EEPROM_SECLOCK);
- for(i = 0; i < 11; i++) {
- if(cmd & (1<<15))
- ASSERT(SGIMC_EEPROM_SDATAO);
- else
- DEASSERT(SGIMC_EEPROM_SDATAO);
- DEASSERT(SGIMC_EEPROM_SECLOCK);
- ASSERT(SGIMC_EEPROM_SECLOCK);
- cmd <<= 1;
- }
- DEASSERT(SGIMC_EEPROM_SDATAO);
- for(i = 0; i < (sizeof(unsigned short) * 8); i++) {
- unsigned int tmp;
-
- DEASSERT(SGIMC_EEPROM_SECLOCK);
- DELAY;
- ASSERT(SGIMC_EEPROM_SECLOCK);
- DELAY;
- data <<= 1;
- tmp = *cpu_control;
- if(tmp & SGIMC_EEPROM_SDATAI)
- data |= 1;
- }
- DEASSERT(SGIMC_EEPROM_SECLOCK);
- DEASSERT(SGIMC_EEPROM_CSEL);
- ASSERT(SGIMC_EEPROM_PRE);
- ASSERT(SGIMC_EEPROM_SECLOCK);
-
- data <<= PAGE_SHIFT;
- if (data == 0)
- return 0;
-
- scache_size = data;
-
- printk("R4600/R5000 SCACHE size %ldK, linesize 32 bytes.\n",
- scache_size >> 10);
-
- return 1;
-}
-
-/* XXX Check with wje if the Indy caches can differenciate between
- writeback + invalidate and just invalidate. */
-struct bcache_ops indy_sc_ops = {
- indy_sc_enable,
- indy_sc_disable,
- indy_sc_wback_invalidate,
- indy_sc_wback_invalidate
-};
-
-void __init indy_sc_init(void)
-{
- if (indy_sc_probe()) {
- indy_sc_enable();
- bcops = &indy_sc_ops;
- }
-}
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