static int get_cf_lock(void)
{
int retry = 10;
/* CONTROLREG = LOCKREG */
ace_writew(0x0002, 0x18);
/* Wait for MPULOCK in STATUSREG[15:0] */
while (! (ace_readw(0x04) & 0x0002)) {
if (retry < 0)
return -1;
udelay(100000);
retry -= 1;
}
return 0;
}
block_dev_desc_t *systemace_get_dev(int dev)
{
/* The first time through this, the systemace_dev object is
not yet initialized. In that case, fill it in. */
if (systemace_dev.blksz == 0) {
systemace_dev.if_type = IF_TYPE_UNKNOWN;
systemace_dev.dev = 0;
systemace_dev.part_type = PART_TYPE_UNKNOWN;
systemace_dev.type = DEV_TYPE_HARDDISK;
systemace_dev.blksz = 512;
systemace_dev.removable = 1;
systemace_dev.block_read = systemace_read;
/*
* Ensure the correct bus mode (8/16 bits) gets enabled
*/
ace_writew(CONFIG_SYS_SYSTEMACE_WIDTH == 8 ? 0 : 0x0001, 0);
init_part(&systemace_dev);
}
return &systemace_dev;
}
static void release_cf_lock(void)
{
/* CONTROLREG = none */
ace_writew(0x0000, 0x18);
}
/*
* This function is called (by dereferencing the block_read pointer in
* the dev_desc) to read blocks of data. The return value is the
* number of blocks read. A zero return indicates an error.
*/
static unsigned long systemace_read(int dev,
unsigned long start,
unsigned long blkcnt,
unsigned long *buffer)
{
int retry;
unsigned blk_countdown;
unsigned char*dp = (unsigned char*)buffer;
if (get_cf_lock() < 0) {
unsigned status = ace_readw(0x04);
/* If CFDETECT is false, card is missing. */
if (! (status&0x0010)) {
printf("** CompactFlash card not present. **\n");
return 0;
}
printf("**** ACE locked away from me (STATUSREG=%04x)\n", status);
return 0;
}
#ifdef DEBUG_SYSTEMACE
printf("... systemace read %lu sectors at %lu\n", blkcnt, start);
#endif
retry = 2000;
for (;;) {
unsigned val = ace_readw(0x04);
/* If CFDETECT is false, card is missing. */
if (! (val & 0x0010)) {
printf("**** ACE CompactFlash not found.\n");
release_cf_lock();
return 0;
}
/* If RDYFORCMD, then we are ready to go. */
if (val & 0x0100)
break;
if (retry < 0) {
printf("**** SystemACE not ready.\n");
release_cf_lock();
return 0;
}
udelay(1000);
retry -= 1;
}
/* The SystemACE can only transfer 256 sectors at a time, so
limit the current chunk of sectors. The blk_countdown
variable is the number of sectors left to transfer. */
blk_countdown = blkcnt;
while (blk_countdown > 0) {
unsigned trans = blk_countdown;
if (trans > 256) trans = 256;
#ifdef DEBUG_SYSTEMACE
printf("... transfer %lu sector in a chunk\n", trans);
#endif
/* Write LBA block address */
ace_writew((start>> 0) & 0xffff, 0x10);
ace_writew((start>>16) & 0x00ff, 0x12);
/* NOTE: in the Write Sector count below, a count of 0
causes a transfer of 256, so &0xff gives the right
value for whatever transfer count we want. */
/* Write sector count | ReadMemCardData. */
ace_writew((trans&0xff) | 0x0300, 0x14);
retry = trans * 16;
while (retry > 0) {
int idx;
/* Wait for buffer to become ready. */
while (! (ace_readw(0x04) & 0x0020)) {
udelay(100);
}
/* Read 16 words of 2bytes from the sector buffer. */
for (idx = 0 ; idx < 16 ; idx += 1) {
unsigned short val = ace_readw(0x40);
*dp++ = val & 0xff;
*dp++ = (val>>8) & 0xff;
}
retry -= 1;
}
/* Count the blocks we transfer this time. */
start += trans;
blk_countdown -= trans;
}
release_cf_lock();
return blkcnt;
}
static void release_cf_lock(void)
{
unsigned val = ace_readw(0x18);
val &= ~(0x0002);
ace_writew((val & 0xffff), 0x18);
}
