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a little bit of nand cleanup

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bushing 2009-04-12 18:06:53 -07:00
parent f806abdac2
commit 4788621a9b
1 changed files with 19 additions and 16 deletions
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35
nand.c
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@ -1,8 +1,9 @@
/* /*
mini - a Free Software replacement for the Nintendo/BroadOn IOS. mini - a Free Software replacement for the Nintendo/BroadOn IOS.
NAND support low-level NAND support
Copyright (C) 2008, 2009 Haxx Enterprises <bushing@gmail.com>
Copyright (C) 2008, 2009 Sven Peter <svenpeter@gmail.com> Copyright (C) 2008, 2009 Sven Peter <svenpeter@gmail.com>
Copyright (C) 2008, 2009 Hector Martin "marcan" <marcan@marcansoft.com> Copyright (C) 2008, 2009 Hector Martin "marcan" <marcan@marcansoft.com>
@ -51,18 +52,18 @@ type *name = (type*)(((u32)(_al__##name)) + ((alignment) - (( \
(u32)(_al__##name))&((alignment)-1)))) (u32)(_al__##name))&((alignment)-1))))
#define NAND_RESET 0xff #define NAND_RESET 0xff
#define NAND_CHIPID 0x90 #define NAND_CHIPID 0x90
#define NAND_GETSTATUS 0x70 #define NAND_GETSTATUS 0x70
#define NAND_ERASE_PRE 0x60 #define NAND_ERASE_PRE 0x60
#define NAND_ERASE_POST 0xd0 #define NAND_ERASE_POST 0xd0
#define NAND_READ_PRE 0x00 #define NAND_READ_PRE 0x00
#define NAND_READ_POST 0x30 #define NAND_READ_POST 0x30
#define NAND_WRITE_PRE 0x80 #define NAND_WRITE_PRE 0x80
#define NAND_WRITE_POST 0x10 #define NAND_WRITE_POST 0x10
#define NAND_BUSY_MASK 0x80000000 #define NAND_BUSY_MASK 0x80000000
#define NAND_ERROR 0x20000000 #define NAND_ERROR 0x20000000
#define NAND_FLAGS_IRQ 0x40000000 #define NAND_FLAGS_IRQ 0x40000000
#define NAND_FLAGS_WAIT 0x8000 #define NAND_FLAGS_WAIT 0x8000
@ -159,10 +160,9 @@ void __nand_setup_dma(u8 *data, u8 *spare) {
} }
} }
int nand_reset(void) int nand_reset(void) {
{
NAND_debug("nand_reset()\n"); NAND_debug("nand_reset()\n");
// IOS actually uses NAND_FLAGS_IRQ | NAND_FLAGS_WAIT here // IOS actually uses NAND_FLAGS_IRQ | NAND_FLAGS_WAIT here
nand_send_command(NAND_RESET, 0, NAND_FLAGS_WAIT, 0); nand_send_command(NAND_RESET, 0, NAND_FLAGS_WAIT, 0);
__nand_wait(); __nand_wait();
// enable NAND controller // enable NAND controller
@ -206,8 +206,8 @@ void nand_read_page(u32 pageno, void *data, void *ecc) {
nand_send_command(NAND_READ_POST, 0, NAND_FLAGS_IRQ | NAND_FLAGS_WAIT | NAND_FLAGS_RD | NAND_FLAGS_ECC, 0x840); nand_send_command(NAND_READ_POST, 0, NAND_FLAGS_IRQ | NAND_FLAGS_WAIT | NAND_FLAGS_RD | NAND_FLAGS_ECC, 0x840);
} }
void nand_wait() { void nand_wait(void) {
// power-saving IRQ wait // power-saving IRQ wait
while(!irq_flag) { while(!irq_flag) {
u32 cookie = irq_kill(); u32 cookie = irq_kill();
if(!irq_flag) if(!irq_flag)
@ -220,6 +220,8 @@ void nand_wait() {
void nand_write_page(u32 pageno, void *data, void *ecc) { void nand_write_page(u32 pageno, void *data, void *ecc) {
irq_flag = 0; irq_flag = 0;
NAND_debug("nand_write_page(%u, %p, %p)\n", pageno, data, ecc); NAND_debug("nand_write_page(%u, %p, %p)\n", pageno, data, ecc);
// this is a safety check to prevent you from accidentally wiping out boot1 or boot2.
if ((pageno < 0x200) || (pageno >= NAND_MAX_PAGE)) { if ((pageno < 0x200) || (pageno >= NAND_MAX_PAGE)) {
gecko_printf("Error: nand_write to page %d forbidden\n", pageno); gecko_printf("Error: nand_write to page %d forbidden\n", pageno);
return; return;
@ -239,6 +241,8 @@ void nand_write_page(u32 pageno, void *data, void *ecc) {
void nand_erase_block(u32 pageno) { void nand_erase_block(u32 pageno) {
irq_flag = 0; irq_flag = 0;
NAND_debug("nand_erase_block(%d)\n", pageno); NAND_debug("nand_erase_block(%d)\n", pageno);
// this is a safety check to prevent you from accidentally wiping out boot1 or boot2.
if ((pageno < 0x200) || (pageno >= NAND_MAX_PAGE)) { if ((pageno < 0x200) || (pageno >= NAND_MAX_PAGE)) {
gecko_printf("Error: nand_erase to page %d forbidden\n", pageno); gecko_printf("Error: nand_erase to page %d forbidden\n", pageno);
return; return;
@ -248,7 +252,6 @@ void nand_erase_block(u32 pageno) {
__nand_wait(); __nand_wait();
nand_send_command(NAND_ERASE_POST, 0, NAND_FLAGS_IRQ | NAND_FLAGS_WAIT, 0); nand_send_command(NAND_ERASE_POST, 0, NAND_FLAGS_IRQ | NAND_FLAGS_WAIT, 0);
NAND_debug("nand_erase_block(%d) done\n", pageno); NAND_debug("nand_erase_block(%d) done\n", pageno);
} }
#endif #endif