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block: m25p80: Extend address mode

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Extend address mode allows to switch flash 16 MiB banks,
allowing user to access all flash sectors.
This access mode is used by u-boot.

Signed-off-by: Marcin Krzeminski <marcin.krzeminski@nokia.com>
Reviewed-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
Message-id: 1458719789-29868-5-git-send-email-marcin.krzeminski@nokia.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Marcin Krzeminski 2016-03-30 17:27:23 +01:00 committed by Peter Maydell
parent 76e872695a
commit d8a29a7a89
1 changed files with 27 additions and 0 deletions
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27
hw/block/m25p80.c
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@ -48,6 +48,9 @@
*/
#define WR_1 0x100
/* 16 MiB max in 3 byte address mode */
#define MAX_3BYTES_SIZE 0x1000000
typedef struct FlashPartInfo {
const char *part_name;
/* jedec code. (jedec >> 16) & 0xff is the 1st byte, >> 8 the 2nd etc */
@ -234,6 +237,9 @@ typedef enum {
ERASE_32K = 0x52,
ERASE_SECTOR = 0xd8,
EXTEND_ADDR_READ = 0xC8,
EXTEND_ADDR_WRITE = 0xC5,
RESET_ENABLE = 0x66,
RESET_MEMORY = 0x99,
} FlashCMD;
@ -264,6 +270,7 @@ typedef struct Flash {
uint64_t cur_addr;
bool write_enable;
bool reset_enable;
uint8_t ear;
int64_t dirty_page;
@ -404,6 +411,7 @@ 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];
s->cur_addr += (s->ear & 0x3) * MAX_3BYTES_SIZE;
s->state = STATE_IDLE;
@ -431,6 +439,9 @@ static void complete_collecting_data(Flash *s)
s->write_enable = false;
}
break;
case EXTEND_ADDR_WRITE:
s->ear = s->data[0];
break;
default:
break;
}
@ -440,6 +451,7 @@ static void reset_memory(Flash *s)
{
s->cmd_in_progress = NOP;
s->cur_addr = 0;
s->ear = 0;
s->len = 0;
s->needed_bytes = 0;
s->pos = 0;
@ -563,6 +575,20 @@ static void decode_new_cmd(Flash *s, uint32_t value)
break;
case NOP:
break;
case EXTEND_ADDR_READ:
s->data[0] = s->ear;
s->pos = 0;
s->len = 1;
s->state = STATE_READING_DATA;
break;
case EXTEND_ADDR_WRITE:
if (s->write_enable) {
s->needed_bytes = 1;
s->pos = 0;
s->len = 0;
s->state = STATE_COLLECTING_DATA;
}
break;
case RESET_ENABLE:
s->reset_enable = true;
break;
@ -704,6 +730,7 @@ static const VMStateDescription vmstate_m25p80 = {
VMSTATE_UINT64(cur_addr, Flash),
VMSTATE_BOOL(write_enable, Flash),
VMSTATE_BOOL_V(reset_enable, Flash, 2),
VMSTATE_UINT8_V(ear, Flash, 2),
VMSTATE_END_OF_LIST()
}
};