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Merge branch 'feat/support_mxic_unlock_v4.4' into 'release/v4.4'

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spi_flash: support unlock MXIC flash chips (v4.4)

See merge request espressif/esp-idf!17251
This commit is contained in:
Michael (XIAO Xufeng) 2022-03-03 11:13:09 +08:00
commit eff03cbbd9
1 changed files with 33 additions and 28 deletions
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61
components/bootloader_support/src/bootloader_flash.c
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@ -43,15 +43,15 @@
#define BYTESHIFT(VAR, IDX) (((VAR) >> ((IDX) * 8)) & 0xFF)
#define ISSI_ID 0x9D
#define MXIC_ID 0xC2
#define GD_Q_ID_HIGH 0xC8
#define GD_Q_ID_MID 0x40
#define GD_Q_ID_LOW 0x16
#define ESP_BOOTLOADER_SPIFLASH_BP_MASK_ISSI (BIT7 | BIT5 | BIT4 | BIT3 | BIT2)
#define ESP_BOOTLOADER_SPIFLASH_QE_16B BIT9 // QE position when you write 16 bits at one time.
#define ESP_BOOTLOADER_SPIFLASH_QE_8B BIT1 // QE position when you write 8 bits(for SR2) at one time.
#define ESP_BOOTLOADER_SPIFLASH_WRITE_8B (8)
#define ESP_BOOTLOADER_SPIFLASH_WRITE_16B (16)
#define ESP_BOOTLOADER_SPIFLASH_QE_GD_SR2 BIT1 // QE position when you write 8 bits(for SR2) at one time.
#define ESP_BOOTLOADER_SPIFLASH_QE_SR1_2BYTE BIT9 // QE position when you write 16 bits at one time.
#ifndef BOOTLOADER_BUILD
/* Normal app version maps to esp_spi_flash.h operations...
@ -495,72 +495,77 @@ FORCE_INLINE_ATTR bool is_gd_q_chip(const esp_rom_spiflash_chip_t* chip)
return BYTESHIFT(chip->device_id, 2) == GD_Q_ID_HIGH && BYTESHIFT(chip->device_id, 1) == GD_Q_ID_MID && BYTESHIFT(chip->device_id, 0) >= GD_Q_ID_LOW;
}
FORCE_INLINE_ATTR bool is_mxic_chip(const esp_rom_spiflash_chip_t* chip)
{
return BYTESHIFT(chip->device_id, 2) == MXIC_ID;
}
esp_err_t IRAM_ATTR __attribute__((weak)) bootloader_flash_unlock(void)
{
// At the beginning status == new_status == status_sr2 == new_status_sr2 == 0.
// If the register doesn't need to be updated, keep them the same (0), so that no command will be actually sent.
uint16_t status = 0; // status for SR1 or SR1+SR2 if writing SR with 01H + 2Bytes.
uint16_t new_status = 0;
uint8_t status_sr2 = 0; // status_sr2 for SR2.
uint8_t new_status_sr2 = 0;
uint8_t write_sr_bit = 0;
uint8_t sr1_bit_num = 0;
esp_err_t err = ESP_OK;
esp_rom_spiflash_wait_idle(&g_rom_flashchip);
if (is_issi_chip(&g_rom_flashchip)) {
write_sr_bit = ESP_BOOTLOADER_SPIFLASH_WRITE_8B;
// ISSI chips have different QE position
if (is_issi_chip(&g_rom_flashchip) || is_mxic_chip(&g_rom_flashchip)) {
// Currently ISSI & MXIC share the same command and register layout, which is different from the default model.
// If any code here needs to be modified, check both chips.
status = bootloader_execute_flash_command(CMD_RDSR, 0, 0, 8);
/* Clear all bits in the mask.
(This is different from ROM esp_rom_spiflash_unlock, which keeps all bits as-is.)
*/
sr1_bit_num = 8;
new_status = status & (~ESP_BOOTLOADER_SPIFLASH_BP_MASK_ISSI);
// Skip if nothing needs to be cleared. Otherwise will waste time waiting for the flash to clear nothing.
} else if (is_gd_q_chip(&g_rom_flashchip)) {
/* The GD chips behaviour is to clear all bits in SR1 and clear bits in SR2 except QE bit.
Use 01H to write SR1 and 31H to write SR2.
*/
write_sr_bit = ESP_BOOTLOADER_SPIFLASH_WRITE_8B;
status = bootloader_execute_flash_command(CMD_RDSR, 0, 0, 8);
sr1_bit_num = 8;
new_status = 0;
status_sr2 = bootloader_execute_flash_command(CMD_RDSR2, 0, 0, 8);
new_status_sr2 = status_sr2 & ESP_BOOTLOADER_SPIFLASH_QE_8B;
new_status_sr2 = status_sr2 & ESP_BOOTLOADER_SPIFLASH_QE_GD_SR2;
} else {
/* For common behaviour, like XMC chips, Use 01H+2Bytes to write both SR1 and SR2*/
write_sr_bit = ESP_BOOTLOADER_SPIFLASH_WRITE_16B;
status = bootloader_execute_flash_command(CMD_RDSR, 0, 0, 8) | (bootloader_execute_flash_command(CMD_RDSR2, 0, 0, 8) << 8);
/* Clear all bits except QE, if it is set.
(This is different from ROM esp_rom_spiflash_unlock, which keeps all bits as-is.)
*/
new_status = status & ESP_BOOTLOADER_SPIFLASH_QE_16B;
sr1_bit_num = 16;
new_status = status & ESP_BOOTLOADER_SPIFLASH_QE_SR1_2BYTE;
}
// When SR is written, set to true to indicate that WRDI need to be sent to ensure the protection is ON before return.
bool status_written = false;
// Skip if nothing needs to be changed. Meaningless writing to SR increases the risk during write and wastes time.
if (status != new_status) {
/* if the status in SR not equal to the ideal status, the status need to be updated */
esp_rom_spiflash_wait_idle(&g_rom_flashchip);
bootloader_execute_flash_command(CMD_WREN, 0, 0, 0);
esp_rom_spiflash_wait_idle(&g_rom_flashchip);
bootloader_execute_flash_command(CMD_WRSR, new_status, write_sr_bit, 0);
esp_rom_spiflash_wait_idle(&g_rom_flashchip);
bootloader_execute_flash_command(CMD_WRSR, new_status, sr1_bit_num, 0);
status_written = true;
}
if (status_sr2 != new_status_sr2) {
/* If the status in SR2 not equal to the ideal status, the status need to be updated.
It doesn't need to be updated if status in SR2 is 0.
Note: if we need to update both SR1 and SR2, the `CMD_WREN` needs to be sent again.
*/
esp_rom_spiflash_wait_idle(&g_rom_flashchip);
bootloader_execute_flash_command(CMD_WREN, 0, 0, 0);
esp_rom_spiflash_wait_idle(&g_rom_flashchip);
bootloader_execute_flash_command(CMD_WRSR2, new_status_sr2, write_sr_bit, 0);
esp_rom_spiflash_wait_idle(&g_rom_flashchip);
bootloader_execute_flash_command(CMD_WRSR2, new_status_sr2, 8, 0);
status_written = true;
}
if (status_written) {
//Call esp_rom_spiflash_wait_idle to make sure previous WRSR is completed.
esp_rom_spiflash_wait_idle(&g_rom_flashchip);
bootloader_execute_flash_command(CMD_WRDI, 0, 0, 0);
}
bootloader_execute_flash_command(CMD_WRDI, 0, 0, 0);
esp_rom_spiflash_wait_idle(&g_rom_flashchip);
return err;
}