From d8a29a7a894de1aa0cbbd36d056af8d44f52e359 Mon Sep 17 00:00:00 2001 From: Marcin Krzeminski Date: Wed, 30 Mar 2016 17:27:23 +0100 Subject: block: m25p80: Extend address mode 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 Reviewed-by: Peter Crosthwaite Message-id: 1458719789-29868-5-git-send-email-marcin.krzeminski@nokia.com Signed-off-by: Peter Maydell --- hw/block/m25p80.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/hw/block/m25p80.c b/hw/block/m25p80.c index 49867411e5..03f59ae528 100644 --- a/hw/block/m25p80.c +++ b/hw/block/m25p80.c @@ -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() } }; -- cgit v1.2.3