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hw: m25p80: Add Block Protect and Top Bottom bits for write protect

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Signed-off-by: Iris Chen <irischenlj@fb.com>
Reviewed-by: Francisco Iglesias <frasse.iglesias@gmail.com>
Message-Id: <20220708164552.3462620-1-irischenlj@fb.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
This commit is contained in:
Iris Chen 2022-07-14 16:24:38 +02:00 committed by Cédric Le Goater
parent bceb4d994d
commit 2113a12897
1 changed files with 90 additions and 12 deletions
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102
hw/block/m25p80.c
View file

@ -36,21 +36,19 @@
#include "trace.h"
#include "qom/object.h"
/* Fields for FlashPartInfo->flags */
/* erase capabilities */
#define ER_4K 1
#define ER_32K 2
/* set to allow the page program command to write 0s back to 1. Useful for
* modelling EEPROM with SPI flash command set
*/
#define EEPROM 0x100
/* 16 MiB max in 3 byte address mode */
#define MAX_3BYTES_SIZE 0x1000000
#define SPI_NOR_MAX_ID_LEN 6
/* Fields for FlashPartInfo->flags */
enum spi_flash_option_flags {
ER_4K = BIT(0),
ER_32K = BIT(1),
EEPROM = BIT(2),
HAS_SR_TB = BIT(3),
HAS_SR_BP3_BIT6 = BIT(4),
};
typedef struct FlashPartInfo {
const char *part_name;
/*
@ -251,7 +249,8 @@ static const FlashPartInfo known_devices[] = {
{ INFO("n25q512a11", 0x20bb20, 0, 64 << 10, 1024, ER_4K) },
{ INFO("n25q512a13", 0x20ba20, 0, 64 << 10, 1024, ER_4K) },
{ INFO("n25q128", 0x20ba18, 0, 64 << 10, 256, 0) },
{ INFO("n25q256a", 0x20ba19, 0, 64 << 10, 512, ER_4K) },
{ INFO("n25q256a", 0x20ba19, 0, 64 << 10, 512,
ER_4K | HAS_SR_BP3_BIT6 | HAS_SR_TB) },
{ INFO("n25q512a", 0x20ba20, 0, 64 << 10, 1024, ER_4K) },
{ INFO("n25q512ax3", 0x20ba20, 0x1000, 64 << 10, 1024, ER_4K) },
{ INFO("mt25ql512ab", 0x20ba20, 0x1044, 64 << 10, 1024, ER_4K | ER_32K) },
@ -478,6 +477,11 @@ struct Flash {
bool reset_enable;
bool quad_enable;
bool aai_enable;
bool block_protect0;
bool block_protect1;
bool block_protect2;
bool block_protect3;
bool top_bottom_bit;
bool status_register_write_disabled;
uint8_t ear;
@ -623,12 +627,36 @@ void flash_write8(Flash *s, uint32_t addr, uint8_t data)
{
uint32_t page = addr / s->pi->page_size;
uint8_t prev = s->storage[s->cur_addr];
uint32_t block_protect_value = (s->block_protect3 << 3) |
(s->block_protect2 << 2) |
(s->block_protect1 << 1) |
(s->block_protect0 << 0);
if (!s->write_enable) {
qemu_log_mask(LOG_GUEST_ERROR, "M25P80: write with write protect!\n");
return;
}
if (block_protect_value > 0) {
uint32_t num_protected_sectors = 1 << (block_protect_value - 1);
uint32_t sector = addr / s->pi->sector_size;
/* top_bottom_bit == 0 means TOP */
if (!s->top_bottom_bit) {
if (s->pi->n_sectors <= sector + num_protected_sectors) {
qemu_log_mask(LOG_GUEST_ERROR,
"M25P80: write with write protect!\n");
return;
}
} else {
if (sector < num_protected_sectors) {
qemu_log_mask(LOG_GUEST_ERROR,
"M25P80: write with write protect!\n");
return;
}
}
}
if ((prev ^ data) & data) {
trace_m25p80_programming_zero_to_one(s, addr, prev, data);
}
@ -726,6 +754,15 @@ static void complete_collecting_data(Flash *s)
break;
case WRSR:
s->status_register_write_disabled = extract32(s->data[0], 7, 1);
s->block_protect0 = extract32(s->data[0], 2, 1);
s->block_protect1 = extract32(s->data[0], 3, 1);
s->block_protect2 = extract32(s->data[0], 4, 1);
if (s->pi->flags & HAS_SR_TB) {
s->top_bottom_bit = extract32(s->data[0], 5, 1);
}
if (s->pi->flags & HAS_SR_BP3_BIT6) {
s->block_protect3 = extract32(s->data[0], 6, 1);
}
switch (get_man(s)) {
case MAN_SPANSION:
@ -1212,6 +1249,15 @@ static void decode_new_cmd(Flash *s, uint32_t value)
case RDSR:
s->data[0] = (!!s->write_enable) << 1;
s->data[0] |= (!!s->status_register_write_disabled) << 7;
s->data[0] |= (!!s->block_protect0) << 2;
s->data[0] |= (!!s->block_protect1) << 3;
s->data[0] |= (!!s->block_protect2) << 4;
if (s->pi->flags & HAS_SR_TB) {
s->data[0] |= (!!s->top_bottom_bit) << 5;
}
if (s->pi->flags & HAS_SR_BP3_BIT6) {
s->data[0] |= (!!s->block_protect3) << 6;
}
if (get_man(s) == MAN_MACRONIX || get_man(s) == MAN_ISSI) {
s->data[0] |= (!!s->quad_enable) << 6;
@ -1552,6 +1598,11 @@ static void m25p80_reset(DeviceState *d)
s->wp_level = true;
s->status_register_write_disabled = false;
s->block_protect0 = false;
s->block_protect1 = false;
s->block_protect2 = false;
s->block_protect3 = false;
s->top_bottom_bit = false;
reset_memory(s);
}
@ -1638,6 +1689,32 @@ static const VMStateDescription vmstate_m25p80_write_protect = {
}
};
static bool m25p80_block_protect_needed(void *opaque)
{
Flash *s = (Flash *)opaque;
return s->block_protect0 ||
s->block_protect1 ||
s->block_protect2 ||
s->block_protect3 ||
s->top_bottom_bit;
}
static const VMStateDescription vmstate_m25p80_block_protect = {
.name = "m25p80/block_protect",
.version_id = 1,
.minimum_version_id = 1,
.needed = m25p80_block_protect_needed,
.fields = (VMStateField[]) {
VMSTATE_BOOL(block_protect0, Flash),
VMSTATE_BOOL(block_protect1, Flash),
VMSTATE_BOOL(block_protect2, Flash),
VMSTATE_BOOL(block_protect3, Flash),
VMSTATE_BOOL(top_bottom_bit, Flash),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_m25p80 = {
.name = "m25p80",
.version_id = 0,
@ -1670,6 +1747,7 @@ static const VMStateDescription vmstate_m25p80 = {
&vmstate_m25p80_data_read_loop,
&vmstate_m25p80_aai_enable,
&vmstate_m25p80_write_protect,
&vmstate_m25p80_block_protect,
NULL
}
};