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m25p80: Support for Quad SPI 

Added the Quad mode read and write commands. Data remains serialized on a
single wire, i.e. the quad mode instructions just behave the same as single
mode, with the expection of modelling the varying number of dummy/mode bytes
between the address bytes and the first data word.

Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
This commit is contained in:
Peter Crosthwaite 2012-10-15 14:34:37 +10:00
parent 50cd721482
commit 419336a9f9
1 changed files with 57 additions and 4 deletions
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61
hw/m25p80.c
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@ -72,6 +72,10 @@ typedef struct FlashPartInfo {
.page_size = 256,\
.flags = (_flags),\
#define JEDEC_NUMONYX 0x20
#define JEDEC_WINBOND 0xEF
#define JEDEC_SPANSION 0x01
static const FlashPartInfo known_devices[] = {
/* Atmel -- some are (confusingly) marketed as "DataFlash" */
{ INFO("at25fs010", 0x1f6601, 0, 32 << 10, 4, ER_4K) },
@ -180,17 +184,26 @@ static const FlashPartInfo known_devices[] = {
typedef enum {
NOP = 0,
PP = 0x2,
READ = 0x3,
WRDI = 0x4,
RDSR = 0x5,
WREN = 0x6,
JEDEC_READ = 0x9f,
BULK_ERASE = 0xc7,
READ = 0x3,
FAST_READ = 0xb,
DOR = 0x3b,
QOR = 0x6b,
DIOR = 0xbb,
QIOR = 0xeb,
PP = 0x2,
DPP = 0xa2,
QPP = 0x32,
ERASE_4K = 0x20,
ERASE_32K = 0x52,
ERASE_SECTOR = 0xd8,
JEDEC_READ = 0x9f,
BULK_ERASE = 0xc7,
} FlashCMD;
typedef enum {
@ -346,11 +359,17 @@ static void complete_collecting_data(Flash *s)
s->cur_addr |= s->data[2];
switch (s->cmd_in_progress) {
case DPP:
case QPP:
case PP:
s->state = STATE_PAGE_PROGRAM;
break;
case READ:
case FAST_READ:
case DOR:
case QOR:
case DIOR:
case QIOR:
s->state = STATE_READ;
break;
case ERASE_4K:
@ -374,6 +393,8 @@ static void decode_new_cmd(Flash *s, uint32_t value)
case ERASE_32K:
case ERASE_SECTOR:
case READ:
case DPP:
case QPP:
case PP:
s->needed_bytes = 3;
s->pos = 0;
@ -382,12 +403,44 @@ static void decode_new_cmd(Flash *s, uint32_t value)
break;
case FAST_READ:
case DOR:
case QOR:
s->needed_bytes = 4;
s->pos = 0;
s->len = 0;
s->state = STATE_COLLECTING_DATA;
break;
case DIOR:
switch ((s->pi->jedec >> 16) & 0xFF) {
case JEDEC_WINBOND:
case JEDEC_SPANSION:
s->needed_bytes = 4;
break;
case JEDEC_NUMONYX:
default:
s->needed_bytes = 5;
}
s->pos = 0;
s->len = 0;
s->state = STATE_COLLECTING_DATA;
break;
case QIOR:
switch ((s->pi->jedec >> 16) & 0xFF) {
case JEDEC_WINBOND:
case JEDEC_SPANSION:
s->needed_bytes = 6;
break;
case JEDEC_NUMONYX:
default:
s->needed_bytes = 8;
}
s->pos = 0;
s->len = 0;
s->state = STATE_COLLECTING_DATA;
break;
case WRDI:
s->write_enable = false;
break;