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block: m25p80: 4byte address mode 

This patch adds only 4byte address mode (does not cover dummy cycles).
This mode is needed to access more than 16 MiB of flash.

Signed-off-by: Marcin Krzeminski <marcin.krzeminski@nokia.com>
Reviewed-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
Message-id: 1458719789-29868-6-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 d8a29a7a89
commit c0f3f6754a
1 changed files with 33 additions and 10 deletions
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43
hw/block/m25p80.c
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@ -237,6 +237,9 @@ typedef enum {
ERASE_32K = 0x52,
ERASE_SECTOR = 0xd8,
EN_4BYTE_ADDR = 0xB7,
EX_4BYTE_ADDR = 0xE9,
EXTEND_ADDR_READ = 0xC8,
EXTEND_ADDR_WRITE = 0xC5,
@ -269,6 +272,7 @@ typedef struct Flash {
uint8_t cmd_in_progress;
uint64_t cur_addr;
bool write_enable;
bool four_bytes_address_mode;
bool reset_enable;
uint8_t ear;
@ -406,12 +410,25 @@ void flash_write8(Flash *s, uint64_t addr, uint8_t data)
s->dirty_page = page;
}
static inline int get_addr_length(Flash *s)
{
return s->four_bytes_address_mode ? 4 : 3;
}
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;
int i;
s->cur_addr = 0;
for (i = 0; i < get_addr_length(s); ++i) {
s->cur_addr <<= 8;
s->cur_addr |= s->data[i];
}
if (get_addr_length(s) == 3) {
s->cur_addr += (s->ear & 0x3) * MAX_3BYTES_SIZE;
}
s->state = STATE_IDLE;
@ -452,6 +469,7 @@ static void reset_memory(Flash *s)
s->cmd_in_progress = NOP;
s->cur_addr = 0;
s->ear = 0;
s->four_bytes_address_mode = false;
s->len = 0;
s->needed_bytes = 0;
s->pos = 0;
@ -480,7 +498,7 @@ static void decode_new_cmd(Flash *s, uint32_t value)
case DPP:
case QPP:
case PP:
s->needed_bytes = 3;
s->needed_bytes = get_addr_length(s);
s->pos = 0;
s->len = 0;
s->state = STATE_COLLECTING_DATA;
@ -489,7 +507,7 @@ static void decode_new_cmd(Flash *s, uint32_t value)
case FAST_READ:
case DOR:
case QOR:
s->needed_bytes = 4;
s->needed_bytes = get_addr_length(s) + 1;
s->pos = 0;
s->len = 0;
s->state = STATE_COLLECTING_DATA;
@ -501,9 +519,8 @@ static void decode_new_cmd(Flash *s, uint32_t value)
case JEDEC_SPANSION:
s->needed_bytes = 4;
break;
case JEDEC_NUMONYX:
default:
s->needed_bytes = 5;
s->needed_bytes = get_addr_length(s) + 2;
}
s->pos = 0;
s->len = 0;
@ -516,9 +533,8 @@ static void decode_new_cmd(Flash *s, uint32_t value)
case JEDEC_SPANSION:
s->needed_bytes = 6;
break;
case JEDEC_NUMONYX:
default:
s->needed_bytes = 8;
s->needed_bytes = get_addr_length(s) + 4;
}
s->pos = 0;
s->len = 0;
@ -575,6 +591,12 @@ 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 EXTEND_ADDR_READ:
s->data[0] = s->ear;
s->pos = 0;
@ -731,6 +753,7 @@ static const VMStateDescription vmstate_m25p80 = {
VMSTATE_BOOL(write_enable, Flash),
VMSTATE_BOOL_V(reset_enable, Flash, 2),
VMSTATE_UINT8_V(ear, Flash, 2),
VMSTATE_BOOL_V(four_bytes_address_mode, Flash, 2),
VMSTATE_END_OF_LIST()
}
};