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isfshax/stage2/nand.c
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/*
* minute - a port of the "mini" IOS replacement for the Wii U.
*
* Copyright (C) 2021 rw-r-r-0644
* Copyright (C) 2016 SALT
* Copyright (C) 2016 Daz Jones <daz@dazzozo.com>
*
* Copyright (C) 2008, 2009 Haxx Enterprises <bushing@gmail.com>
* Copyright (C) 2008, 2009 Sven Peter <svenpeter@gmail.com>
* Copyright (C) 2008, 2009 Hector Martin "marcan" <marcan@marcansoft.com>
*
* This code is licensed to you under the terms of the GNU GPL, version 2;
* see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
*/
#include "nand.h"
#include "utils.h"
#include "types.h"
#include "latte.h"
#include "memory.h"
#include "irq.h"
#include "crypto.h"
#include "debug.h"
#include <string.h>
/* ECC definitions */
#define ECC_SIZE 0x10
#define ECC_STOR_OFFS 0x30
#define ECC_CALC_OFFS 0x40
/* required buffers sizes */
#define SPARE_BUF_SIZE (SPARE_SIZE + ECC_SIZE + 0x10)
#define STATUS_BUF_SIZE 0x40
/* NAND chip commands */
#define CMD_CHIPID 0x90
#define CMD_RESET 0xff
#define CMD_GET_STATUS 0x70
#define CMD_ERASE_SETUP 0x60
#define CMD_ERASE 0xd0
#define CMD_SERIALDATA_IN 0x80
#define CMD_RANDOMDATA_IN 0x85
#define CMD_PROGRAM 0x10
#define CMD_READ_SETUP 0x00
#define CMD_READ 0x30
/* NAND_CTRL definitions */
#define CTRL_FL_EXEC (0x80000000)
#define CTRL_FL_ERR (0x20000000)
#define CTRL_FL_IRQ (0x40000000)
#define CTRL_FL_WAIT (0x00008000)
#define CTRL_FL_WR (0x00004000)
#define CTRL_FL_RD (0x00002000)
#define CTRL_FL_ECC (0x00001000)
#define CTRL_CMD(cmd) (0x00ff0000 & (cmd << 16))
#define CTRL_ADDR(addr) (0x1f000000 & (addr << 24))
#define CTRL_SIZE(size) (0x00000fff & (size))
/* NAND_CONF definitions */
#define CONF_FL_WP (0x80000000) /* bsp:fla clears this flag when writing */
#define CONF_FL_EN (0x08000000) /* enable nand controller */
#define CONF_ATTR_INIT (0x743e3eff) /* initial nand config */
#define CONF_ATTR_NORMAL (0x550f1eff) /* normal nand config */
/* NAND_BANK definitions */
#define BANK_FL_4 (0x00000004) /* set by bsp:fla for revisions after latte A2X */
#if NAND_WRITE_ENABLED
static u8 nand_status_buf[STATUS_BUF_SIZE] ALIGNED(256);
#endif
static u8 nand_spare_buf[SPARE_BUF_SIZE] ALIGNED(256);
static u32 nand_enabled_banks = BANK_SLC;
static int irq_flag = 0;
int nand_error(const char *error)
{
DEBUG("nand: %s\n", error);
nand_initialize();
return -1;
}
void nand_irq(void)
{
ahb_flush_from(WB_FLA);
ahb_flush_to(RB_IOD);
irq_flag = 1;
}
void nand_irq_clear_and_enable(void)
{
irq_flag = 0;
irq_enable(IRQ_NAND);
}
void nand_wait_irq(void)
{
while(!irq_flag) {
u32 cookie = irq_kill();
if (!irq_flag) {
irq_wait();
}
irq_restore(cookie);
}
}
void nand_enable_banks(u32 bank)
{
nand_enabled_banks = bank & 3;
}
void nand_set_config(int write_enable)
{
u32 conf, bank;
write32(NAND_CTRL, 0);
write32(NAND_CONF, 0);
/* set nand config */
conf = (write_enable ? 0 : CONF_FL_WP)
| (CONF_FL_EN)
| (CONF_ATTR_NORMAL);
write32(NAND_CONF, conf);
/* set nand bank */
bank = BANK_FL_4
| nand_enabled_banks;
write32(NAND_BANK, bank);
}
#if NAND_WRITE_ENABLED
int nand_erase_block(u32 blockno)
{
if (blockno > BLOCK_COUNT) {
return nand_error("invalid block number");
}
/* clear write protection */
nand_set_config(1);
/* erase setup */
write32(NAND_CTRL, 0);
write32(NAND_ADDR0, 0);
write32(NAND_ADDR1, blockno * BLOCK_PAGES);
write32(NAND_CTRL,
CTRL_FL_EXEC |
CTRL_CMD(CMD_ERASE_SETUP) |
CTRL_ADDR(0x1c));
while(read32(NAND_CTRL) & CTRL_FL_EXEC);
write32(NAND_CTRL, 0);
nand_irq_clear_and_enable();
/* erase */
write32(NAND_CTRL,
CTRL_FL_EXEC |
CTRL_FL_IRQ |
CTRL_CMD(CMD_ERASE) |
CTRL_FL_WAIT);
nand_wait_irq();
/* set write protection */
nand_set_config(0);
/* get status */
*nand_status_buf = 1;
dc_flushrange(nand_status_buf, STATUS_BUF_SIZE);
write32(NAND_DATA, dma_addr(nand_status_buf));
write32(NAND_CTRL,
CTRL_FL_EXEC |
CTRL_CMD(CMD_GET_STATUS) |
CTRL_FL_RD |
CTRL_SIZE(STATUS_BUF_SIZE));
while(read32(NAND_CTRL) & CTRL_FL_EXEC);
ahb_flush_from(WB_FLA);
dc_invalidaterange(nand_status_buf, STATUS_BUF_SIZE);
/* check failure */
if (*nand_status_buf & 1) {
return nand_error("erase command failed");
}
return 0;
}
int nand_write_page(u32 pageno, void *data, void *spare)
{
if (pageno > PAGE_COUNT) {
return nand_error("invalid page number");
}
if ((u32)data & 0x1f) {
return nand_error("unaligned page buffer");
}
dc_flushrange(data, PAGE_SIZE);
ahb_flush_to(RB_FLA);
dc_invalidaterange(nand_spare_buf + ECC_CALC_OFFS, ECC_SIZE);
/* clear write protection */
nand_set_config(1);
/* send page content and calc ecc */
write32(NAND_CTRL, 0);
write32(NAND_ADDR0, 0);
write32(NAND_ADDR1, pageno);
write32(NAND_DATA, dma_addr(data));
write32(NAND_ECC, dma_addr(nand_spare_buf));
write32(NAND_CTRL,
CTRL_FL_EXEC |
CTRL_ADDR(0x1f) |
CTRL_CMD(CMD_SERIALDATA_IN) |
CTRL_FL_WR |
CTRL_FL_ECC |
CTRL_SIZE(PAGE_SIZE));
while(read32(NAND_CTRL) & CTRL_FL_EXEC);
if (read32(NAND_CTRL) & CTRL_FL_ERR) {
nand_error("error executing data input command");
}
/* prepare page spare */
ahb_flush_from(WB_FLA);
if (spare) {
memcpy(nand_spare_buf, spare, SPARE_SIZE);
} else {
memset(nand_spare_buf, 0, SPARE_SIZE);
}
nand_spare_buf[0] = 0xff;
memcpy(nand_spare_buf + ECC_STOR_OFFS, nand_spare_buf + ECC_CALC_OFFS, ECC_SIZE);
dc_flushrange(nand_spare_buf, SPARE_SIZE);
/* setup irq */
write32(NAND_CTRL, 0);
nand_irq_clear_and_enable();
/* send spare content */
write32(NAND_ADDR0, PAGE_SIZE);
write32(NAND_ADDR1, 0);
write32(NAND_DATA, dma_addr(nand_spare_buf));
write32(NAND_ECC, 0);
write32(NAND_CTRL,
CTRL_FL_EXEC |
CTRL_ADDR(0x3) |
CTRL_CMD(CMD_RANDOMDATA_IN) |
CTRL_FL_WR |
CTRL_SIZE(SPARE_SIZE));
while(read32(NAND_CTRL) & CTRL_FL_EXEC);
if (read32(NAND_CTRL) & CTRL_FL_ERR) {
nand_error("error executing random data input command");
}
/* program page */
write32(NAND_CTRL, 0);
write32(NAND_CTRL,
CTRL_FL_EXEC |
CTRL_FL_IRQ |
CTRL_CMD(CMD_PROGRAM) |
CTRL_FL_WAIT);
nand_wait_irq();
/* set write protection */
nand_set_config(0);
/* get status */
*nand_status_buf = 1;
dc_flushrange(nand_status_buf, STATUS_BUF_SIZE);
write32(NAND_DATA, dma_addr(nand_status_buf));
write32(NAND_CTRL,
CTRL_FL_EXEC |
CTRL_CMD(CMD_GET_STATUS) |
CTRL_FL_RD |
CTRL_SIZE(STATUS_BUF_SIZE));
while(read32(NAND_CTRL) & CTRL_FL_EXEC);
ahb_flush_from(WB_FLA);
dc_invalidaterange(nand_status_buf, STATUS_BUF_SIZE);
/* check failure */
if (*nand_status_buf & 1) {
return nand_error("page program command failed");
}
return 0;
}
#endif
int nand_ecc_correct(u8 *data, u32 *ecc_save, u32 *ecc_calc, u32 size)
{
u32 syndrome;
u16 odd, even;
/* check if the page contain ecc errors */
if (!memcmp(ecc_save, ecc_calc, size)) {
return 0;
}
/* correct ecc errors */
for (int i = 0; i < (size / 4); i++) {
if (ecc_save[i] == ecc_calc[i]) {
continue;
}
/* don't try to correct unformatted pages */
if (ecc_save[i] == 0xffffffff) {
continue;
}
/* calculate ecc syndrome */
syndrome = (ecc_save[i] ^ ecc_calc[i]) & 0x0fff0fff;
if ((syndrome & (syndrome - 1)) == 0) {
continue;
}
/* extract odd and even halves */
odd = syndrome >> 16;
even = syndrome;
/* uncorrectable error */
if ((odd ^ even) != 0xfff) {
return -1;
}
/* fix the bad bit */
data[i * 0x200 + (odd >> 3)] ^= 1 << (odd & 7);
}
return 1;
}
int nand_read_page(u32 pageno, void *data, void *spare)
{
int res = 0;
if (pageno > PAGE_COUNT) {
return nand_error("invalid page number");
}
if ((u32)data & 0x1f) {
return nand_error("unaligned page buffer");
}
/* set nand config */
nand_set_config(0);
/* prepare for reading */
write32(NAND_CTRL, 0);
write32(NAND_ADDR0, 0);
write32(NAND_ADDR1, pageno);
write32(NAND_CTRL,
CTRL_FL_EXEC |
CTRL_ADDR(0x1f) |
CTRL_CMD(CMD_READ_SETUP));
while(read32(NAND_CTRL) & CTRL_FL_EXEC);
/* read page and spare */
dc_invalidaterange(data, PAGE_SIZE);
dc_invalidaterange(nand_spare_buf, SPARE_BUF_SIZE);
write32(NAND_CTRL, 0);
write32(NAND_DATA, dma_addr(data));
write32(NAND_ECC, dma_addr(nand_spare_buf));
nand_irq_clear_and_enable();
write32(NAND_CTRL,
CTRL_FL_EXEC |
CTRL_FL_IRQ |
CTRL_CMD(CMD_READ) |
CTRL_FL_WAIT |
CTRL_FL_RD |
CTRL_FL_ECC |
CTRL_SIZE(PAGE_SIZE + SPARE_SIZE));
nand_wait_irq();
if (read32(NAND_CTRL) & CTRL_FL_ERR) {
return nand_error("error executing page read command");
}
write32(NAND_CTRL, 0);
ahb_flush_from(WB_FLA);
/* correct ecc errors */
res = nand_ecc_correct(data,
(u32*)(nand_spare_buf + ECC_STOR_OFFS),
(u32*)(nand_spare_buf + ECC_CALC_OFFS),
ECC_SIZE);
if (res < 0) {
return nand_error("uncorrectable ecc error");
}
/* copy spare from internal buffer */
if (spare) {
memcpy(spare, nand_spare_buf, SPARE_SIZE);
}
return res;
}
void nand_deinitialize(void)
{
/* shutdown nand banks */
write32(NAND_BANK_CTRL, 0);
while(read32(NAND_BANK_CTRL) & (1 << 31));
write32(NAND_BANK_CTRL, 0);
for (int i = 0; i < 0xc0; i += 0x18) {
write32(NAND_REG_BASE + 0x40 + i, 0);
write32(NAND_REG_BASE + 0x44 + i, 0);
write32(NAND_REG_BASE + 0x48 + i, 0);
write32(NAND_REG_BASE + 0x4c + i, 0);
write32(NAND_REG_BASE + 0x50 + i, 0);
write32(NAND_REG_BASE + 0x54 + i, 0);
}
/* shutdown main nand bank */
write32(NAND_CTRL, 0);
while(read32(NAND_CTRL) & (1 << 31));
write32(NAND_CTRL, 0);
/* write init config */
write32(NAND_CONF, CONF_ATTR_INIT);
write32(NAND_BANK, 1);
}
void nand_initialize(void)
{
for (int i = 0; i < 2; i++) {
/* shutdown nand interface */
nand_deinitialize();
/* set nand init config and enable */
write32(NAND_CONF,
CONF_FL_EN |
CONF_ATTR_INIT);
/* set nand bank */
write32(NAND_BANK,
BANK_FL_4 | // ???
(i ? 3 : 1)); // ???
/* reset nand chip */
write32(NAND_CTRL,
CTRL_FL_EXEC |
CTRL_CMD(CMD_RESET) |
CTRL_FL_WAIT);
while(read32(NAND_CTRL) & CTRL_FL_EXEC);
write32(NAND_CTRL, 0);
}
/* set normal nand config */
nand_set_config(0);
}
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