MIPS: Netlogic: COP2 save/restore code

Add COP2 register state structure and functions for Netlogic XLP. The
RX and TX buffers and status registers are to be saved. Since the
registers are 64-bit, do the implementation in inline assembly which
works on both 32-bit and 64-bit kernels.

Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Cc: linux-mips@linux-mips.org
Cc: ddaney.cavm@gmail.com
Patchwork: https://patchwork.linux-mips.org/patch/5413/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Jayachandran C 2013-06-10 06:30:04 +00:00 committed by Ralf Baechle
parent 64f6ebe639
commit 5649d37c2b
4 changed files with 142 additions and 1 deletions

View file

@ -22,6 +22,16 @@ extern void octeon_cop2_restore(struct octeon_cop2_state *);
#define cop2_present 1 #define cop2_present 1
#define cop2_lazy_restore 1 #define cop2_lazy_restore 1
#elif defined(CONFIG_CPU_XLP)
extern void nlm_cop2_save(struct nlm_cop2_state *);
extern void nlm_cop2_restore(struct nlm_cop2_state *);
#define cop2_save(r) nlm_cop2_save(r)
#define cop2_restore(r) nlm_cop2_restore(r)
#define cop2_present 1
#define cop2_lazy_restore 0
#else #else
#define cop2_present 0 #define cop2_present 0

View file

@ -190,6 +190,16 @@ struct octeon_cvmseg_state {
[cpu_dcache_line_size() / sizeof(unsigned long)]; [cpu_dcache_line_size() / sizeof(unsigned long)];
}; };
#elif defined(CONFIG_CPU_XLP)
struct nlm_cop2_state {
u64 rx[4];
u64 tx[4];
u32 tx_msg_status;
u32 rx_msg_status;
};
#define COP2_INIT \
.cp2 = {{0}, {0}, 0, 0},
#else #else
#define COP2_INIT #define COP2_INIT
#endif #endif
@ -236,6 +246,9 @@ struct thread_struct {
#ifdef CONFIG_CPU_CAVIUM_OCTEON #ifdef CONFIG_CPU_CAVIUM_OCTEON
struct octeon_cop2_state cp2 __attribute__ ((__aligned__(128))); struct octeon_cop2_state cp2 __attribute__ ((__aligned__(128)));
struct octeon_cvmseg_state cvmseg __attribute__ ((__aligned__(128))); struct octeon_cvmseg_state cvmseg __attribute__ ((__aligned__(128)));
#endif
#ifdef CONFIG_CPU_XLP
struct nlm_cop2_state cp2;
#endif #endif
struct mips_abi *abi; struct mips_abi *abi;
}; };

View file

@ -1,3 +1,3 @@
obj-y += setup.o nlm_hal.o obj-y += setup.o nlm_hal.o cop2-ex.o
obj-$(CONFIG_SMP) += wakeup.o obj-$(CONFIG_SMP) += wakeup.o
obj-$(CONFIG_USB) += usb-init.o obj-$(CONFIG_USB) += usb-init.o

View file

@ -0,0 +1,118 @@
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2013 Broadcom Corporation.
*
* based on arch/mips/cavium-octeon/cpu.c
* Copyright (C) 2009 Wind River Systems,
* written by Ralf Baechle <ralf@linux-mips.org>
*/
#include <linux/init.h>
#include <linux/irqflags.h>
#include <linux/notifier.h>
#include <linux/prefetch.h>
#include <linux/sched.h>
#include <asm/cop2.h>
#include <asm/current.h>
#include <asm/mipsregs.h>
#include <asm/page.h>
#include <asm/netlogic/mips-extns.h>
/*
* 64 bit ops are done in inline assembly to support 32 bit
* compilation
*/
void nlm_cop2_save(struct nlm_cop2_state *r)
{
asm volatile(
".set push\n"
".set noat\n"
"dmfc2 $1, $0, 0\n"
"sd $1, 0(%1)\n"
"dmfc2 $1, $0, 1\n"
"sd $1, 8(%1)\n"
"dmfc2 $1, $0, 2\n"
"sd $1, 16(%1)\n"
"dmfc2 $1, $0, 3\n"
"sd $1, 24(%1)\n"
"dmfc2 $1, $1, 0\n"
"sd $1, 0(%2)\n"
"dmfc2 $1, $1, 1\n"
"sd $1, 8(%2)\n"
"dmfc2 $1, $1, 2\n"
"sd $1, 16(%2)\n"
"dmfc2 $1, $1, 3\n"
"sd $1, 24(%2)\n"
".set pop\n"
: "=m"(*r)
: "r"(r->tx), "r"(r->rx));
r->tx_msg_status = __read_32bit_c2_register($2, 0);
r->rx_msg_status = __read_32bit_c2_register($3, 0) & 0x0fffffff;
}
void nlm_cop2_restore(struct nlm_cop2_state *r)
{
u32 rstat;
asm volatile(
".set push\n"
".set noat\n"
"ld $1, 0(%1)\n"
"dmtc2 $1, $0, 0\n"
"ld $1, 8(%1)\n"
"dmtc2 $1, $0, 1\n"
"ld $1, 16(%1)\n"
"dmtc2 $1, $0, 2\n"
"ld $1, 24(%1)\n"
"dmtc2 $1, $0, 3\n"
"ld $1, 0(%2)\n"
"dmtc2 $1, $1, 0\n"
"ld $1, 8(%2)\n"
"dmtc2 $1, $1, 1\n"
"ld $1, 16(%2)\n"
"dmtc2 $1, $1, 2\n"
"ld $1, 24(%2)\n"
"dmtc2 $1, $1, 3\n"
".set pop\n"
: : "m"(*r), "r"(r->tx), "r"(r->rx));
__write_32bit_c2_register($2, 0, r->tx_msg_status);
rstat = __read_32bit_c2_register($3, 0) & 0xf0000000u;
__write_32bit_c2_register($3, 0, r->rx_msg_status | rstat);
}
static int nlm_cu2_call(struct notifier_block *nfb, unsigned long action,
void *data)
{
unsigned long flags;
unsigned int status;
switch (action) {
case CU2_EXCEPTION:
if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
break;
local_irq_save(flags);
KSTK_STATUS(current) |= ST0_CU2;
status = read_c0_status();
write_c0_status(status | ST0_CU2);
nlm_cop2_restore(&(current->thread.cp2));
write_c0_status(status & ~ST0_CU2);
local_irq_restore(flags);
pr_info("COP2 access enabled for pid %d (%s)\n",
current->pid, current->comm);
return NOTIFY_BAD; /* Don't call default notifier */
}
return NOTIFY_OK; /* Let default notifier send signals */
}
static int __init nlm_cu2_setup(void)
{
return cu2_notifier(nlm_cu2_call, 0);
}
early_initcall(nlm_cu2_setup);