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diff --git a/common/cmd_ace.c b/common/cmd_ace.c
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+/*
+ * Copyright (c) 2004 Picture Elements, Inc.
+ * Stephen Williams (XXXXXXXXXXXXXXXX)
+ *
+ * This source code is free software; you can redistribute it
+ * and/or modify it in source code form under the terms of the GNU
+ * General Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+#ident "$Id:$"
+
+/*
+ * The Xilinx SystemACE chip support is activated by defining
+ * CONFIG_SYSTEMACE to turn on support, and CFG_SYSTEMACE_BASE
+ * to set the base address of the device. This code currently
+ * assumes that the chip is connected via a byte-wide bus.
+ *
+ * The CONFIG_SYSTEMACE also adds to fat support the device class
+ * "ace" that allows the user to execute "fatls ace 0" and the
+ * like. This works by making the systemace_get_dev function
+ * 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.
+ */
+
+# include <common.h>
+# include <command.h>
+# include <systemace.h>
+# include <part.h>
+# include <asm/io.h>
+
+#ifdef CONFIG_SYSTEMACE
+
+/*
+ * The ace_readw and writew functions read/write 16bit words, but the
+ * offset value is the BYTE offset as most used in the Xilinx
+ * datasheet for the SystemACE chip. The CFG_SYSTEMACE_BASE is defined
+ * to be the base address for the chip, usually in the local
+ * peripheral bus.
+ */
+static unsigned ace_readw(unsigned offset)
+{
+ return readw(CFG_SYSTEMACE_BASE+offset);
+}
+
+static unsigned ace_writew(unsigned val, unsigned offset)
+{
+ writew(val, CFG_SYSTEMACE_BASE+offset);
+}
+
+/* */
+
+static unsigned long systemace_read(int dev,
+ unsigned long start,
+ unsigned long blkcnt,
+ unsigned long *buffer);
+
+static block_dev_desc_t systemace_dev = {0};
+
+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;
+}
+
+static void release_cf_lock(void)
+{
+ /* CONTROLREG = none */
+ ace_writew(0x0000, 0x18);
+}
+
+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.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;
+ }
+
+ return &systemace_dev;
+}
+
+/*
+ * 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)
+{
+ unsigned val;
+ int retry;
+ 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;
+ }
+
+ 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;
+ }
+
+ /* Write LBA block address */
+ ace_writew(start & 0xffff, 0x10);
+ start >>= 16;
+ ace_writew(start & 0xff, 0x12);
+
+ /* Write sector count | ReadMemCardData. */
+ ace_writew(blkcnt | 0x0300, 0x14);
+
+ /* CONTROLREG = CFGRESET|LOCKREQ */
+ ace_writew(0x0082, 0x18);
+
+ retry = blkcnt * 16;
+ while (retry > 0) {
+ int idx;
+
+ /* Wait for buffer to become ready. */
+ while (! (ace_readw(0x04) & 0x0020)) {
+ udelay(1000);
+ }
+
+ /* 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;
+ }
+
+ release_cf_lock();
+
+ return blkcnt;
+}
+
+
+#endif
+
+/*
+ * $Log: $
+ */
+