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/*
* indy_sc.c: Indy cache management functions.
*
* Copyright (C) 1997 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/sgimc.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/bootinfo.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)
{
__asm__ __volatile__(
".set\tnoreorder\n\t"
"or\t%0, %4\t\t\t# first line to flush\n\t"
"or\t%1, %4\t\t\t# last line to flush\n"
"1:\tsw $0, 0(%0)\n\t"
"bne\t%0, %1, 1b\n\t"
"daddu\t%0, 32\n\t"
".set reorder"
: "=r" (first), "=r" (last)
: "0" (first), "1" (last), "r" (0x9000000080000000)
: "$1");
}
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 inline indy_sc_enable(void)
{
#ifdef DEBUG_CACHE
printk("Enabling R4600 SCACHE\n");
#endif
*(volatile unsigned char *) 0x9000000080000000 = 0;
}
static void indy_sc_disable(void)
{
#ifdef DEBUG_CACHE
printk("Disabling R4600 SCACHE\n");
#endif
*(volatile unsigned short *) 0x9000000080000000 = 0;
}
static inline __init int indy_sc_probe(void)
{
volatile u32 *cpu_control;
unsigned short cmd = 0xc220;
unsigned long data = 0;
int i, n;
#ifdef __MIPSEB__
cpu_control = (volatile u32 *) KSEG1ADDR(0x1fa00034);
#else
cpu_control = (volatile u32 *) 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. */
static 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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