Commit 9438a86a authored by Steven J. Hill's avatar Steven J. Hill Committed by Ralf Baechle

MIPS: Octeon: Add support for accessing the boot vector.

Used by the Octeon watchdog driver to get the address of the
firmware boot vector.
Signed-off-by: default avatarSteven J. Hill <steven.hill@cavium.com>
Acked-by: default avatarDavid Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: linux-watchdog@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/17206/Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent d9a46c18
......@@ -16,4 +16,4 @@ obj-y += cvmx-pko.o cvmx-spi.o cvmx-cmd-queue.o \
cvmx-helper-loop.o cvmx-helper-spi.o cvmx-helper-util.o \
cvmx-interrupt-decodes.o cvmx-interrupt-rsl.o
obj-y += cvmx-helper-errata.o cvmx-helper-jtag.o
obj-y += cvmx-helper-errata.o cvmx-helper-jtag.o cvmx-boot-vector.o
/*
* 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) 2004-2017 Cavium, Inc.
*/
/*
We install this program at the bootvector:
------------------------------------
.set noreorder
.set nomacro
.set noat
reset_vector:
dmtc0 $k0, $31, 0 # Save $k0 to DESAVE
dmtc0 $k1, $31, 3 # Save $k1 to KScratch2
mfc0 $k0, $12, 0 # Status
mfc0 $k1, $15, 1 # Ebase
ori $k0, 0x84 # Enable 64-bit addressing, set
# ERL (should already be set)
andi $k1, 0x3ff # mask out core ID
mtc0 $k0, $12, 0 # Status
sll $k1, 5
lui $k0, 0xbfc0
cache 17, 0($0) # Core-14345, clear L1 Dcache virtual
# tags if the core hit an NMI
ld $k0, 0x78($k0) # k0 <- (bfc00078) pointer to the reset vector
synci 0($0) # Invalidate ICache to get coherent
# view of target code.
daddu $k0, $k0, $k1
nop
ld $k0, 0($k0) # k0 <- core specific target address
dmfc0 $k1, $31, 3 # Restore $k1 from KScratch2
beqz $k0, wait_loop # Spin in wait loop
nop
jr $k0
nop
nop # NOPs needed here to fill delay slots
nop # on endian reversal of previous instructions
wait_loop:
wait
nop
b wait_loop
nop
nop
nop
------------------------------------
0000000000000000 <reset_vector>:
0: 40baf800 dmtc0 k0,c0_desave
4: 40bbf803 dmtc0 k1,c0_kscratch2
8: 401a6000 mfc0 k0,c0_status
c: 401b7801 mfc0 k1,c0_ebase
10: 375a0084 ori k0,k0,0x84
14: 337b03ff andi k1,k1,0x3ff
18: 409a6000 mtc0 k0,c0_status
1c: 001bd940 sll k1,k1,0x5
20: 3c1abfc0 lui k0,0xbfc0
24: bc110000 cache 0x11,0(zero)
28: df5a0078 ld k0,120(k0)
2c: 041f0000 synci 0(zero)
30: 035bd02d daddu k0,k0,k1
34: 00000000 nop
38: df5a0000 ld k0,0(k0)
3c: 403bf803 dmfc0 k1,c0_kscratch2
40: 13400005 beqz k0,58 <wait_loop>
44: 00000000 nop
48: 03400008 jr k0
4c: 00000000 nop
50: 00000000 nop
54: 00000000 nop
0000000000000058 <wait_loop>:
58: 42000020 wait
5c: 00000000 nop
60: 1000fffd b 58 <wait_loop>
64: 00000000 nop
68: 00000000 nop
6c: 00000000 nop
*/
#include <asm/octeon/cvmx-boot-vector.h>
static unsigned long long _cvmx_bootvector_data[16] = {
0x40baf80040bbf803ull, /* patch low order 8-bits if no KScratch*/
0x401a6000401b7801ull,
0x375a0084337b03ffull,
0x409a6000001bd940ull,
0x3c1abfc0bc110000ull,
0xdf5a0078041f0000ull,
0x035bd02d00000000ull,
0xdf5a0000403bf803ull, /* patch low order 8-bits if no KScratch*/
0x1340000500000000ull,
0x0340000800000000ull,
0x0000000000000000ull,
0x4200002000000000ull,
0x1000fffd00000000ull,
0x0000000000000000ull,
OCTEON_BOOT_MOVEABLE_MAGIC1,
0 /* To be filled in with address of vector block*/
};
/* 2^10 CPUs */
#define VECTOR_TABLE_SIZE (1024 * sizeof(struct cvmx_boot_vector_element))
static void cvmx_boot_vector_init(void *mem)
{
uint64_t kseg0_mem;
int i;
memset(mem, 0, VECTOR_TABLE_SIZE);
kseg0_mem = cvmx_ptr_to_phys(mem) | 0x8000000000000000ull;
for (i = 0; i < 15; i++) {
uint64_t v = _cvmx_bootvector_data[i];
if (OCTEON_IS_OCTEON1PLUS() && (i == 0 || i == 7))
v &= 0xffffffff00000000ull; /* KScratch not availble. */
cvmx_write_csr(CVMX_MIO_BOOT_LOC_ADR, i * 8);
cvmx_write_csr(CVMX_MIO_BOOT_LOC_DAT, v);
}
cvmx_write_csr(CVMX_MIO_BOOT_LOC_ADR, 15 * 8);
cvmx_write_csr(CVMX_MIO_BOOT_LOC_DAT, kseg0_mem);
cvmx_write_csr(CVMX_MIO_BOOT_LOC_CFGX(0), 0x81fc0000);
}
/**
* Get a pointer to the per-core table of reset vector pointers
*
*/
struct cvmx_boot_vector_element *cvmx_boot_vector_get(void)
{
struct cvmx_boot_vector_element *ret;
ret = cvmx_bootmem_alloc_named_range_once(VECTOR_TABLE_SIZE, 0,
(1ull << 32) - 1, 8, "__boot_vector1__", cvmx_boot_vector_init);
return ret;
}
EXPORT_SYMBOL(cvmx_boot_vector_get);
......@@ -44,6 +44,55 @@ static struct cvmx_bootmem_desc *cvmx_bootmem_desc;
/* See header file for descriptions of functions */
/**
* This macro returns the size of a member of a structure.
* Logically it is the same as "sizeof(s::field)" in C++, but
* C lacks the "::" operator.
*/
#define SIZEOF_FIELD(s, field) sizeof(((s *)NULL)->field)
/**
* This macro returns a member of the
* cvmx_bootmem_named_block_desc_t structure. These members can't
* be directly addressed as they might be in memory not directly
* reachable. In the case where bootmem is compiled with
* LINUX_HOST, the structure itself might be located on a remote
* Octeon. The argument "field" is the member name of the
* cvmx_bootmem_named_block_desc_t to read. Regardless of the type
* of the field, the return type is always a uint64_t. The "addr"
* parameter is the physical address of the structure.
*/
#define CVMX_BOOTMEM_NAMED_GET_FIELD(addr, field) \
__cvmx_bootmem_desc_get(addr, \
offsetof(struct cvmx_bootmem_named_block_desc, field), \
SIZEOF_FIELD(struct cvmx_bootmem_named_block_desc, field))
/**
* This function is the implementation of the get macros defined
* for individual structure members. The argument are generated
* by the macros inorder to read only the needed memory.
*
* @param base 64bit physical address of the complete structure
* @param offset Offset from the beginning of the structure to the member being
* accessed.
* @param size Size of the structure member.
*
* @return Value of the structure member promoted into a uint64_t.
*/
static inline uint64_t __cvmx_bootmem_desc_get(uint64_t base, int offset,
int size)
{
base = (1ull << 63) | (base + offset);
switch (size) {
case 4:
return cvmx_read64_uint32(base);
case 8:
return cvmx_read64_uint64(base);
default:
return 0;
}
}
/*
* Wrapper functions are provided for reading/writing the size and
* next block values as these may not be directly addressible (in 32
......@@ -98,6 +147,42 @@ void *cvmx_bootmem_alloc(uint64_t size, uint64_t alignment)
return cvmx_bootmem_alloc_range(size, alignment, 0, 0);
}
void *cvmx_bootmem_alloc_named_range_once(uint64_t size, uint64_t min_addr,
uint64_t max_addr, uint64_t align,
char *name,
void (*init) (void *))
{
int64_t addr;
void *ptr;
uint64_t named_block_desc_addr;
named_block_desc_addr = (uint64_t)
cvmx_bootmem_phy_named_block_find(name,
(uint32_t)CVMX_BOOTMEM_FLAG_NO_LOCKING);
if (named_block_desc_addr) {
addr = CVMX_BOOTMEM_NAMED_GET_FIELD(named_block_desc_addr,
base_addr);
return cvmx_phys_to_ptr(addr);
}
addr = cvmx_bootmem_phy_named_block_alloc(size, min_addr, max_addr,
align, name,
(uint32_t)CVMX_BOOTMEM_FLAG_NO_LOCKING);
if (addr < 0)
return NULL;
ptr = cvmx_phys_to_ptr(addr);
if (init)
init(ptr);
else
memset(ptr, 0, size);
return ptr;
}
EXPORT_SYMBOL(cvmx_bootmem_alloc_named_range_once);
void *cvmx_bootmem_alloc_named_range(uint64_t size, uint64_t min_addr,
uint64_t max_addr, uint64_t align,
char *name)
......
/*
* 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) 2003-2017 Cavium, Inc.
*/
#ifndef __CVMX_BOOT_VECTOR_H__
#define __CVMX_BOOT_VECTOR_H__
#include <asm/octeon/octeon.h>
/*
* The boot vector table is made up of an array of 1024 elements of
* struct cvmx_boot_vector_element. There is one entry for each
* possible MIPS CPUNum, indexed by the CPUNum.
*
* Once cvmx_boot_vector_get() returns a non-NULL value (indicating
* success), NMI to a core will cause execution to transfer to the
* target_ptr location for that core's entry in the vector table.
*
* The struct cvmx_boot_vector_element fields app0, app1, and app2 can
* be used by the application that has set the target_ptr in any
* application specific manner, they are not touched by the vectoring
* code.
*
* The boot vector code clobbers the CP0_DESAVE register, and on
* OCTEON II and later CPUs also clobbers CP0_KScratch2. All GP
* registers are preserved, except on pre-OCTEON II CPUs, where k1 is
* clobbered.
*
*/
/*
* Applications install the boot bus code in cvmx-boot-vector.c, which
* uses this magic:
*/
#define OCTEON_BOOT_MOVEABLE_MAGIC1 0xdb00110ad358eacdull
struct cvmx_boot_vector_element {
/* kseg0 or xkphys address of target code. */
uint64_t target_ptr;
/* Three application specific arguments. */
uint64_t app0;
uint64_t app1;
uint64_t app2;
};
struct cvmx_boot_vector_element *cvmx_boot_vector_get(void);
#endif /* __CVMX_BOOT_VECTOR_H__ */
......@@ -255,6 +255,34 @@ extern void *cvmx_bootmem_alloc_named_range(uint64_t size, uint64_t min_addr,
uint64_t max_addr, uint64_t align,
char *name);
/**
* Allocate if needed a block of memory from a specific range of the
* free list that was passed to the application by the bootloader, and
* assign it a name in the global named block table. (part of the
* cvmx_bootmem_descriptor_t structure) Named blocks can later be
* freed. If the requested name block is already allocated, return
* the pointer to block of memory. If request cannot be satisfied
* within the address range specified, NULL is returned
*
* @param size Size in bytes of block to allocate
* @param min_addr minimum address of range
* @param max_addr maximum address of range
* @param align Alignment of memory to be allocated. (must be a power of 2)
* @param name name of block - must be less than CVMX_BOOTMEM_NAME_LEN bytes
* @param init Initialization function
*
* The initialization function is optional, if omitted the named block
* is initialized to all zeros when it is created, i.e. once.
*
* @return pointer to block of memory, NULL on error
*/
void *cvmx_bootmem_alloc_named_range_once(uint64_t size,
uint64_t min_addr,
uint64_t max_addr,
uint64_t align,
char *name,
void (*init) (void *));
extern int cvmx_bootmem_free_named(char *name);
/**
......
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