Hello Marcin,
On 12/16/2015 01:57 PM, marcin.krzemin...@nokia.com wrote:
> From: Marcin Krzeminski <marcin.krzemin...@nokia.com>
>
> Signed-off-by: Marcin Krzeminski <marcin.krzemin...@nokia.com>
> ---
> hw/block/m25p80.c | 31 ++++++++++++++++++++++++++++---
> 1 file changed, 28 insertions(+), 3 deletions(-)
>
> diff --git a/hw/block/m25p80.c b/hw/block/m25p80.c
> index 1a547ae..6d5d90d 100644
> --- a/hw/block/m25p80.c
> +++ b/hw/block/m25p80.c
> @@ -237,6 +237,9 @@ typedef enum {
> ERASE_32K = 0x52,
> ERASE_SECTOR = 0xd8,
>
> + EN_4BYTE_ADDR = 0xB7,
> + EX_4BYTE_ADDR = 0xE9,
> +
> RESET_ENABLE = 0x66,
> RESET_MEMORY = 0x99,
>
> @@ -267,6 +270,7 @@ typedef struct Flash {
> uint8_t cmd_in_progress;
> uint64_t cur_addr;
> bool write_enable;
> + bool four_bytes_address_mode;
> bool reset_enable;
> bool initialized;
> uint8_t reset_pin;
> @@ -405,11 +409,24 @@ void flash_write8(Flash *s, uint64_t addr, uint8_t data)
> s->dirty_page = page;
> }
>
> +static inline int is_4bytes(Flash *s)
> +{
> + return s->four_bytes_address_mode;
> + }
> +}
> +
> static void complete_collecting_data(Flash *s)
> {
> - s->cur_addr = s->data[0] << 16;
> - s->cur_addr |= s->data[1] << 8;
> - s->cur_addr |= s->data[2];
> + if (is_4bytes(s)) {
> + s->cur_addr = s->data[0] << 24;
> + s->cur_addr |= s->data[1] << 16;
> + s->cur_addr |= s->data[2] << 8;
> + s->cur_addr |= s->data[3];
> + } else {
> + s->cur_addr = s->data[0] << 16;
> + s->cur_addr |= s->data[1] << 8;
> + s->cur_addr |= s->data[2];
> + }
>
> s->state = STATE_IDLE;
Don't we need to also change 'needed_bytes' in the decode_new_cmd() routine
to increase the number of bytes expected by some commands ?
If so, we could add a width attribute to 'struct Flash' and to something like :
@@ -260,6 +263,7 @@ typedef struct Flash {
uint8_t cmd_in_progress;
uint64_t cur_addr;
bool write_enable;
+ uint8_t width;
int64_t dirty_page;
@@ -401,6 +405,10 @@ static void complete_collecting_data(Fla
s->cur_addr |= s->data[1] << 8;
s->cur_addr |= s->data[2];
+ if (s->width == 4) {
+ s->cur_addr = s->cur_addr << 8 | s->data[4];
+ }
+
s->state = STATE_IDLE;
switch (s->cmd_in_progress) {
@@ -446,7 +454,7 @@ static void decode_new_cmd(Flash *s, uin
case DPP:
case QPP:
case PP:
- s->needed_bytes = 3;
+ s->needed_bytes = s->width;
s->pos = 0;
s->len = 0;
s->state = STATE_COLLECTING_DATA;
@@ -644,6 +658,7 @@ static int m25p80_init(SSISlave *ss)
memset(s->storage, 0xFF, s->size);
}
+ s->width = 3;
return 0;
}
QOR, DIOR, QIOR command also need a check. I suppose an address and some
number of dummy bytes are expected before the fast read command is done.
I would need to check the datasheets.
Cheers,
C.
> @@ -446,6 +463,7 @@ static void reset_memory(Flash *s)
> {
> s->cmd_in_progress = NOP;
> s->cur_addr = 0;
> + s->four_bytes_address_mode = false;
> s->len = 0;
> s->needed_bytes = 0;
> s->pos = 0;
> @@ -565,6 +583,12 @@ static void decode_new_cmd(Flash *s, uint32_t value)
> break;
> case NOP:
> break;
> + case EN_4BYTE_ADDR:
> + s->four_bytes_address_mode = true;
> + break;
> + case EX_4BYTE_ADDR:
> + s->four_bytes_address_mode = false;
> + break;
> case RESET_ENABLE:
> s->reset_enable = true;
> break;
> @@ -715,6 +739,7 @@ static const VMStateDescription vmstate_m25p80 = {
> VMSTATE_UINT8(cmd_in_progress, Flash),
> VMSTATE_UINT64(cur_addr, Flash),
> VMSTATE_BOOL(write_enable, Flash),
> + VMSTATE_BOOL(four_bytes_address_mode, Flash),
> VMSTATE_BOOL(reset_enable, Flash),
> VMSTATE_BOOL(initialized, Flash),
> VMSTATE_UINT8(reset_pin, Flash),
>
