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/*
* Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
* Copyright (C) 1997, 2001 Ralf Baechle (ralf@gnu.org)
* Copyright (C) 2000 SiByte, Inc.
* Copyright (C) 2005 Thiemo Seufer
*
* Written by Justin Carlson of SiByte, Inc.
* and Kip Walker of Broadcom Corp.
*
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <asm/io.h>
#include <asm/sibyte/sb1250.h>
#include <asm/sibyte/sb1250_regs.h>
#include <asm/sibyte/sb1250_dma.h>
#ifdef CONFIG_SB1_PASS_1_WORKAROUNDS
#define SB1_PREF_LOAD_STREAMED_HINT "0"
#define SB1_PREF_STORE_STREAMED_HINT "1"
#else
#define SB1_PREF_LOAD_STREAMED_HINT "4"
#define SB1_PREF_STORE_STREAMED_HINT "5"
#endif
static inline void clear_page_cpu(void *page)
{
unsigned char *addr = (unsigned char *) page;
unsigned char *end = addr + PAGE_SIZE;
/*
* JDCXXX - This should be bottlenecked by the write buffer, but these
* things tend to be mildly unpredictable...should check this on the
* performance model
*
* We prefetch 4 lines ahead. We're also "cheating" slightly here...
* since we know we're on an SB1, we force the assembler to take
* 64-bit operands to speed things up
*/
__asm__ __volatile__(
" .set push \n"
" .set mips4 \n"
" .set noreorder \n"
#ifdef CONFIG_CPU_HAS_PREFETCH
" daddiu %0, %0, 128 \n"
" pref " SB1_PREF_STORE_STREAMED_HINT ", -128(%0) \n"
/* Prefetch the first 4 lines */
" pref " SB1_PREF_STORE_STREAMED_HINT ", -96(%0) \n"
" pref " SB1_PREF_STORE_STREAMED_HINT ", -64(%0) \n"
" pref " SB1_PREF_STORE_STREAMED_HINT ", -32(%0) \n"
"1: sd $0, -128(%0) \n" /* Throw out a cacheline of 0's */
" sd $0, -120(%0) \n"
" sd $0, -112(%0) \n"
" sd $0, -104(%0) \n"
" daddiu %0, %0, 32 \n"
" bnel %0, %1, 1b \n"
" pref " SB1_PREF_STORE_STREAMED_HINT ", -32(%0) \n"
" daddiu %0, %0, -128 \n"
#endif
" sd $0, 0(%0) \n" /* Throw out a cacheline of 0's */
"1: sd $0, 8(%0) \n"
" sd $0, 16(%0) \n"
" sd $0, 24(%0) \n"
" daddiu %0, %0, 32 \n"
" bnel %0, %1, 1b \n"
" sd $0, 0(%0) \n"
" .set pop \n"
: "+r" (addr)
: "r" (end)
: "memory");
}
static inline void copy_page_cpu(void *to, void *from)
{
unsigned char *src = (unsigned char *)from;
unsigned char *dst = (unsigned char *)to;
unsigned char *end = src + PAGE_SIZE;
/*
* The pref's used here are using "streaming" hints, which cause the
* copied data to be kicked out of the cache sooner. A page copy often
* ends up copying a lot more data than is commonly used, so this seems
* to make sense in terms of reducing cache pollution, but I've no real
* performance data to back this up
*/
__asm__ __volatile__(
" .set push \n"
" .set mips4 \n"
" .set noreorder \n"
#ifdef CONFIG_CPU_HAS_PREFETCH
" daddiu %0, %0, 128 \n"
" daddiu %1, %1, 128 \n"
" pref " SB1_PREF_LOAD_STREAMED_HINT ", -128(%0)\n"
/* Prefetch the first 4 lines */
" pref " SB1_PREF_STORE_STREAMED_HINT ", -128(%1)\n"
" pref " SB1_PREF_LOAD_STREAMED_HINT ", -96(%0)\n"
" pref " SB1_PREF_STORE_STREAMED_HINT ", -96(%1)\n"
" pref " SB1_PREF_LOAD_STREAMED_HINT ", -64(%0)\n"
" pref " SB1_PREF_STORE_STREAMED_HINT ", -64(%1)\n"
" pref " SB1_PREF_LOAD_STREAMED_HINT ", -32(%0)\n"
"1: pref " SB1_PREF_STORE_STREAMED_HINT ", -32(%1)\n"
# ifdef CONFIG_64BIT
" ld $8, -128(%0) \n" /* Block copy a cacheline */
" ld $9, -120(%0) \n"
" ld $10, -112(%0) \n"
" ld $11, -104(%0) \n"
" sd $8, -128(%1) \n"
" sd $9, -120(%1) \n"
" sd $10, -112(%1) \n"
" sd $11, -104(%1) \n"
# else
" lw $2, -128(%0) \n" /* Block copy a cacheline */
" lw $3, -124(%0) \n"
" lw $6, -120(%0) \n"
" lw $7, -116(%0) \n"
" lw $8, -112(%0) \n"
" lw $9, -108(%0) \n"
" lw $10, -104(%0) \n"
" lw $11, -100(%0) \n"
" sw $2, -128(%1) \n"
" sw $3, -124(%1) \n"
" sw $6, -120(%1) \n"
" sw $7, -116(%1) \n"
" sw $8, -112(%1) \n"
" sw $9, -108(%1) \n"
" sw $10, -104(%1) \n"
" sw $11, -100(%1) \n"
# endif
" daddiu %0, %0, 32 \n"
" daddiu %1, %1, 32 \n"
" bnel %0, %2, 1b \n"
" pref " SB1_PREF_LOAD_STREAMED_HINT ", -32(%0)\n"
" daddiu %0, %0, -128 \n"
" daddiu %1, %1, -128 \n"
#endif
#ifdef CONFIG_64BIT
" ld $8, 0(%0) \n" /* Block copy a cacheline */
"1: ld $9, 8(%0) \n"
" ld $10, 16(%0) \n"
" ld $11, 24(%0) \n"
" sd $8, 0(%1) \n"
" sd $9, 8(%1) \n"
" sd $10, 16(%1) \n"
" sd $11, 24(%1) \n"
#else
" lw $2, 0(%0) \n" /* Block copy a cacheline */
"1: lw $3, 4(%0) \n"
" lw $6, 8(%0) \n"
" lw $7, 12(%0) \n"
" lw $8, 16(%0) \n"
" lw $9, 20(%0) \n"
" lw $10, 24(%0) \n"
" lw $11, 28(%0) \n"
" sw $2, 0(%1) \n"
" sw $3, 4(%1) \n"
" sw $6, 8(%1) \n"
" sw $7, 12(%1) \n"
" sw $8, 16(%1) \n"
" sw $9, 20(%1) \n"
" sw $10, 24(%1) \n"
" sw $11, 28(%1) \n"
#endif
" daddiu %0, %0, 32 \n"
" daddiu %1, %1, 32 \n"
" bnel %0, %2, 1b \n"
#ifdef CONFIG_64BIT
" ld $8, 0(%0) \n"
#else
" lw $2, 0(%0) \n"
#endif
" .set pop \n"
: "+r" (src), "+r" (dst)
: "r" (end)
#ifdef CONFIG_64BIT
: "$8","$9","$10","$11","memory");
#else
: "$2","$3","$6","$7","$8","$9","$10","$11","memory");
#endif
}
#ifdef CONFIG_SIBYTE_DMA_PAGEOPS
/*
* Pad descriptors to cacheline, since each is exclusively owned by a
* particular CPU.
*/
typedef struct dmadscr_s {
u64 dscr_a;
u64 dscr_b;
u64 pad_a;
u64 pad_b;
} dmadscr_t;
static dmadscr_t page_descr[DM_NUM_CHANNELS]
__attribute__((aligned(SMP_CACHE_BYTES)));
void sb1_dma_init(void)
{
int i;
for (i = 0; i < DM_NUM_CHANNELS; i++) {
const u64 base_val = CPHYSADDR(&page_descr[i]) |
V_DM_DSCR_BASE_RINGSZ(1);
volatile void *base_reg =
IOADDR(A_DM_REGISTER(i, R_DM_DSCR_BASE));
__raw_writeq(base_val, base_reg);
__raw_writeq(base_val | M_DM_DSCR_BASE_RESET, base_reg);
__raw_writeq(base_val | M_DM_DSCR_BASE_ENABL, base_reg);
}
}
void clear_page(void *page)
{
u64 to_phys = CPHYSADDR(page);
unsigned int cpu = smp_processor_id();
/* if the page is not in KSEG0, use old way */
if ((long)KSEGX(page) != (long)CKSEG0)
return clear_page_cpu(page);
page_descr[cpu].dscr_a = to_phys | M_DM_DSCRA_ZERO_MEM |
M_DM_DSCRA_L2C_DEST | M_DM_DSCRA_INTERRUPT;
page_descr[cpu].dscr_b = V_DM_DSCRB_SRC_LENGTH(PAGE_SIZE);
__raw_writeq(1, IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_COUNT)));
/*
* Don't really want to do it this way, but there's no
* reliable way to delay completion detection.
*/
while (!(__raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE_DEBUG)))
& M_DM_DSCR_BASE_INTERRUPT))
;
__raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE)));
}
void copy_page(void *to, void *from)
{
u64 from_phys = CPHYSADDR(from);
u64 to_phys = CPHYSADDR(to);
unsigned int cpu = smp_processor_id();
/* if any page is not in KSEG0, use old way */
if ((long)KSEGX(to) != (long)CKSEG0
|| (long)KSEGX(from) != (long)CKSEG0)
return copy_page_cpu(to, from);
page_descr[cpu].dscr_a = to_phys | M_DM_DSCRA_L2C_DEST |
M_DM_DSCRA_INTERRUPT;
page_descr[cpu].dscr_b = from_phys | V_DM_DSCRB_SRC_LENGTH(PAGE_SIZE);
__raw_writeq(1, IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_COUNT)));
/*
* Don't really want to do it this way, but there's no
* reliable way to delay completion detection.
*/
while (!(__raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE_DEBUG)))
& M_DM_DSCR_BASE_INTERRUPT))
;
__raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE)));
}
#else /* !CONFIG_SIBYTE_DMA_PAGEOPS */
void clear_page(void *page)
{
return clear_page_cpu(page);
}
void copy_page(void *to, void *from)
{
return copy_page_cpu(to, from);
}
#endif /* !CONFIG_SIBYTE_DMA_PAGEOPS */
EXPORT_SYMBOL(clear_page);
EXPORT_SYMBOL(copy_page);
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