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arm_dt: Work around an absent cache-line-size

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The upstream VCHIQ has been denied its cache-line-size property and
forces a cache line size of 32. This doesn't work on V7/8 cpus with
64-bit cache lines.

If an updated DT is found (based on the size encoded in the reg
property, which should be 0x3c not 0xf, and the vchiq node name
"mailbox@7e00b840"), assume the kernel is using the correct cache
line size. A corresponding kernel patch derives the correct value,
and updates the size as indicated.
This commit is contained in:
Phil Elwell
2018-08-23 12:24:39 +01:00
committed by popcornmix
parent c8c0b7638a
commit 4d41ce6ee1
2 changed files with 35 additions and 5 deletions
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31
helpers/dtoverlay/dtoverlay.c
View File

@@ -65,27 +65,48 @@ static void dtoverlay_stdio_logging(dtoverlay_logging_type_t type,
static DTOVERLAY_LOGGING_FUNC *dtoverlay_logging_func = dtoverlay_stdio_logging;
static int dtoverlay_debug_enabled = 0;
static uint32_t dtoverlay_read_u32(const void *src, int off)
uint8_t dtoverlay_read_u8(const void *src, int off)
{
const unsigned char *p = src;
return (p[off + 0] << 0);
}
uint16_t dtoverlay_read_u16(const void *src, int off)
{
const unsigned char *p = src;
return (p[off + 0] << 8) | (p[off + 1] << 0);
}
uint32_t dtoverlay_read_u32(const void *src, int off)
{
const unsigned char *p = src;
return (p[off + 0] << 24) | (p[off + 1] << 16) |
(p[off + 2] << 8) | (p[off + 3] << 0);
}
static void dtoverlay_write_u8(void *dst, int off, uint32_t val)
uint64_t dtoverlay_read_u64(const void *src, int off)
{
const unsigned char *p = src;
return ((uint64_t)p[off + 0] << 56) | ((uint64_t)p[off + 1] << 48) |
((uint64_t)p[off + 2] << 40) | ((uint64_t)p[off + 3] << 32) |
(p[off + 4] << 24) | (p[off + 5] << 16) |
(p[off + 6] << 8) | (p[off + 7] << 0);
}
void dtoverlay_write_u8(void *dst, int off, uint32_t val)
{
unsigned char *p = dst;
p[off] = (val >> 0) & 0xff;
}
static void dtoverlay_write_u16(void *dst, int off, uint32_t val)
void dtoverlay_write_u16(void *dst, int off, uint32_t val)
{
unsigned char *p = dst;
p[off + 0] = (val >> 8) & 0xff;
p[off + 1] = (val >> 0) & 0xff;
}
static void dtoverlay_write_u32(void *dst, int off, uint32_t val)
void dtoverlay_write_u32(void *dst, int off, uint32_t val)
{
unsigned char *p = dst;
p[off + 0] = (val >> 24) & 0xff;
@@ -94,7 +115,7 @@ static void dtoverlay_write_u32(void *dst, int off, uint32_t val)
p[off + 3] = (val >> 0) & 0xff;
}
static void dtoverlay_write_u64(void *dst, int off, uint64_t val)
void dtoverlay_write_u64(void *dst, int off, uint64_t val)
{
unsigned char *p = dst;
p[off + 0] = (val >> 56) & 0xff;

9
helpers/dtoverlay/dtoverlay.h
View File

@@ -81,6 +81,15 @@ typedef int (*override_callback_t)(int override_type,
int target_off, int target_size,
void *callback_value);
uint8_t dtoverlay_read_u8(const void *src, int off);
uint16_t dtoverlay_read_u16(const void *src, int off);
uint32_t dtoverlay_read_u32(const void *src, int off);
uint64_t dtoverlay_read_u64(const void *src, int off);
void dtoverlay_write_u8(void *dst, int off, uint32_t val);
void dtoverlay_write_u16(void *dst, int off, uint32_t val);
void dtoverlay_write_u32(void *dst, int off, uint32_t val);
void dtoverlay_write_u64(void *dst, int off, uint64_t val);
/* Return values: -ve = fatal error, positive = non-fatal error */
int dtoverlay_create_node(DTBLOB_T *dtb, const char *node_name, int path_len);