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Added SuperCard Lite support

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This commit is contained in:
Michael Chisholm 2006-08-19 03:17:43 +00:00
parent 1a5766fbd3
commit c93d8672e1
2 changed files with 28 additions and 5 deletions
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20
source/disc_io/io_scsd.c
View File

@ -42,6 +42,9 @@
2006-08-07 - Chishm
* Moved the SD initialization to a common function
2006-08-19 - Chishm
* Added SuperCard Lite support
*/
#include "io_scsd.h"
@ -54,10 +57,11 @@
/* bit 0: command bit to read */
/* bit 7: command bit to write */
#define REG_SCSD_DATAWRITE (*(vu16*)(0x09000000))
#define REG_SCSD_DATAREAD (*(vu16*)(0x09100000))
#define REG_SCSD_DATAREAD_32 (*(vu32*)(0x09100000))
#define REG_SCSD_LOCK (*(vu16*)(0x09FFFFFE))
#define REG_SCSD_DATAWRITE (*(vu16*)(0x09000000))
#define REG_SCSD_DATAREAD (*(vu16*)(0x09100000))
#define REG_SCSD_DATAREAD_32 (*(vu32*)(0x09100000))
#define REG_SCSD_LITE_ENABLE (*(vu16*)(0x09440000))
#define REG_SCSD_LOCK (*(vu16*)(0x09FFFFFE))
/* bit 0: 1 */
/* bit 1: enable IO interface (SD,CF) */
/* bit 2: enable R/W SDRAM access */
@ -87,6 +91,10 @@ static inline void _SCSD_unlock (void) {
_SC_changeMode (SC_MODE_MEDIA);
}
static inline void _SCSD_enable_lite (void) {
REG_SCSD_LITE_ENABLE = 0;
}
static bool _SCSD_sendCommand (u8 command, u32 argument) {
u8 databuff[6];
u8 *tempDataPtr = databuff;
@ -228,6 +236,8 @@ static bool _SCSD_readData (void* buffer) {
volatile register u32 temp;
int i;
_SCSD_enable_lite();
i = BUSY_WAIT_TIMEOUT;
while ((REG_SCSD_DATAREAD & SCSD_STS_BUSY) && (--i));
if (i == 0) {
@ -329,6 +339,8 @@ bool _SCSD_writeSectors (u32 sector, u32 numSectors, const void* buffer) {
int i;
while (numSectors--) {
_SCSD_enable_lite ();
// Calculate the CRC16
_SD_CRC16 ( data, BYTES_PER_READ, (u8*)crc);

13
source/disc_io/io_scsd_s.s
View File

@ -32,6 +32,9 @@
@ 2006-07-22 - Chishm
@ * First release of stable code
@
@ 2006-08-19 - Chishm
@ * Added SuperCard Lite support
@
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
.align 4
@ -86,10 +89,18 @@ _SCSD_writeData_data_loop_unaligned:
@ Write the data to the card
@ 4 halfwords are transmitted to the Supercard at once, for timing purposes
@ Only the first halfword needs to contain data
@ Only the first halfword needs to contain data for standard SuperCards
@ For the SuperCard Lite, the data is split into 4 nibbles, one per halfword
_SCSD_writeData_data_loop:
ldrh r3, [r0], #2
@ This bit added for SCLite. Notice that the shift is not the same as in
@ the original (buggy) code supplied by Romman
add r3, r3, r3, lsl #20
mov r4, r3, lsr #8
stmia r2, {r3-r4}
subs r5, r5, #2
bne _SCSD_writeData_data_loop