Commit fe599e17 authored by Wolfgang Denk's avatar Wolfgang Denk
Browse files

Fix errors that occur when accessing SystemACE CF

Patch by Jeff Angielski, 09 Jan 2005
parent 7ebdb19b
......@@ -2,6 +2,9 @@
Changes for U-Boot 1.1.3:
======================================================================
* Fix errors that occur when accessing SystemACE CF
Patch by Jeff Angielski, 09 Jan 2005
* Document switching between U-Boot and PlanetCore on RPXlite
by Sam Song, 24 Dec 2004
......
......@@ -31,6 +31,12 @@
* available to cmd_fat.c:get_dev and filling in a block device
* description that has all the bits needed for FAT support to
* read sectors.
*
* According to Xilinx technical support, before accessing the
* SystemACE CF you need to set the following control bits:
* FORCECFGMODE : 1
* CFGMODE : 0
* CFGSTART : 0
*/
# include <common.h>
......@@ -95,7 +101,9 @@ static int get_cf_lock(void)
int retry = 10;
/* CONTROLREG = LOCKREG */
ace_writew(0x0002, 0x18);
unsigned val=ace_readw(0x18);
val|=0x0002;
ace_writew((val&0xffff), 0x18);
/* Wait for MPULOCK in STATUSREG[15:0] */
while (! (ace_readw(0x04) & 0x0002)) {
......@@ -112,8 +120,9 @@ static int get_cf_lock(void)
static void release_cf_lock(void)
{
/* CONTROLREG = none */
ace_writew(0x0000, 0x18);
unsigned val=ace_readw(0x18);
val&=~(0x0002);
ace_writew((val&0xffff), 0x18);
}
block_dev_desc_t * systemace_get_dev(int dev)
......@@ -127,6 +136,9 @@ block_dev_desc_t * systemace_get_dev(int dev)
systemace_dev.blksz = 512;
systemace_dev.removable = 1;
systemace_dev.block_read = systemace_read;
init_part(&systemace_dev);
}
return &systemace_dev;
......@@ -145,6 +157,7 @@ static unsigned long systemace_read(int dev,
int retry;
unsigned blk_countdown;
unsigned char*dp = (unsigned char*)buffer;
unsigned val;
if (get_cf_lock() < 0) {
unsigned status = ace_readw(0x04);
......@@ -165,7 +178,7 @@ static unsigned long systemace_read(int dev,
retry = 2000;
for (;;) {
unsigned val = ace_readw(0x04);
val = ace_readw(0x04);
/* If CFDETECT is false, card is missing. */
if (! (val & 0x0010)) {
......@@ -212,6 +225,11 @@ static unsigned long systemace_read(int dev,
/* Write sector count | ReadMemCardData. */
ace_writew((trans&0xff) | 0x0300, 0x14);
/* Reset the configruation controller */
val = ace_readw(0x18);
val|=0x0080;
ace_writew(val, 0x18);
retry = trans * 16;
while (retry > 0) {
int idx;
......@@ -231,6 +249,11 @@ static unsigned long systemace_read(int dev,
retry -= 1;
}
/* Clear the configruation controller reset */
val = ace_readw(0x18);
val&=~0x0080;
ace_writew(val, 0x18);
/* Count the blocks we transfer this time. */
start += trans;
blk_countdown -= trans;
......
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