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253 lines
6.6 KiB
C
253 lines
6.6 KiB
C
/*
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* Copyright (c) 2004 Picture Elements, Inc.
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* Stephen Williams (XXXXXXXXXXXXXXXX)
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*
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* This source code is free software; you can redistribute it
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* and/or modify it in source code form under the terms of the GNU
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* General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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/*
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* The Xilinx SystemACE chip support is activated by defining
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* CONFIG_SYSTEMACE to turn on support, and CFG_SYSTEMACE_BASE
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* to set the base address of the device. This code currently
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* assumes that the chip is connected via a byte-wide bus.
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*
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* The CONFIG_SYSTEMACE also adds to fat support the device class
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* "ace" that allows the user to execute "fatls ace 0" and the
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* like. This works by making the systemace_get_dev function
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* available to cmd_fat.c:get_dev and filling in a block device
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* description that has all the bits needed for FAT support to
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* read sectors.
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*
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* According to Xilinx technical support, before accessing the
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* SystemACE CF you need to set the following control bits:
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* FORCECFGMODE : 1
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* CFGMODE : 0
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* CFGSTART : 0
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*/
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#include <common.h>
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#include <command.h>
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#include <systemace.h>
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#include <part.h>
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#include <asm/io.h>
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#ifdef CONFIG_SYSTEMACE
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/*
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* The ace_readw and writew functions read/write 16bit words, but the
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* offset value is the BYTE offset as most used in the Xilinx
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* datasheet for the SystemACE chip. The CFG_SYSTEMACE_BASE is defined
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* to be the base address for the chip, usually in the local
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* peripheral bus.
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*/
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#if (CFG_SYSTEMACE_WIDTH == 8)
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#if !defined(__BIG_ENDIAN)
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#define ace_readw(off) ((readb(CFG_SYSTEMACE_BASE+off)<<8) | \
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(readb(CFG_SYSTEMACE_BASE+off+1)))
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#define ace_writew(val, off) {writeb(val>>8, CFG_SYSTEMACE_BASE+off); \
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writeb(val, CFG_SYSTEMACE_BASE+off+1);}
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#else
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#define ace_readw(off) ((readb(CFG_SYSTEMACE_BASE+off)) | \
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(readb(CFG_SYSTEMACE_BASE+off+1)<<8))
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#define ace_writew(val, off) {writeb(val, CFG_SYSTEMACE_BASE+off); \
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writeb(val>>8, CFG_SYSTEMACE_BASE+off+1);}
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#endif
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#else
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#define ace_readw(off) (in16(CFG_SYSTEMACE_BASE+off))
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#define ace_writew(val, off) (out16(CFG_SYSTEMACE_BASE+off,val))
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#endif
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/* */
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static unsigned long systemace_read(int dev, unsigned long start,
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unsigned long blkcnt, void *buffer);
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static block_dev_desc_t systemace_dev = { 0 };
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static int get_cf_lock(void)
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{
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int retry = 10;
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/* CONTROLREG = LOCKREG */
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unsigned val = ace_readw(0x18);
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val |= 0x0002;
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ace_writew((val & 0xffff), 0x18);
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/* Wait for MPULOCK in STATUSREG[15:0] */
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while (!(ace_readw(0x04) & 0x0002)) {
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if (retry < 0)
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return -1;
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udelay(100000);
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retry -= 1;
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}
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return 0;
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}
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static void release_cf_lock(void)
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{
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unsigned val = ace_readw(0x18);
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val &= ~(0x0002);
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ace_writew((val & 0xffff), 0x18);
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}
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block_dev_desc_t *systemace_get_dev(int dev)
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{
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/* The first time through this, the systemace_dev object is
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not yet initialized. In that case, fill it in. */
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if (systemace_dev.blksz == 0) {
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systemace_dev.if_type = IF_TYPE_UNKNOWN;
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systemace_dev.dev = 0;
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systemace_dev.part_type = PART_TYPE_UNKNOWN;
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systemace_dev.type = DEV_TYPE_HARDDISK;
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systemace_dev.blksz = 512;
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systemace_dev.removable = 1;
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systemace_dev.block_read = systemace_read;
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/*
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* Ensure the correct bus mode (8/16 bits) gets enabled
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*/
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ace_writew(CFG_SYSTEMACE_WIDTH == 8 ? 0 : 0x0001, 0);
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init_part(&systemace_dev);
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}
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return &systemace_dev;
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}
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/*
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* This function is called (by dereferencing the block_read pointer in
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* the dev_desc) to read blocks of data. The return value is the
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* number of blocks read. A zero return indicates an error.
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*/
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static unsigned long systemace_read(int dev, unsigned long start,
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unsigned long blkcnt, void *buffer)
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{
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int retry;
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unsigned blk_countdown;
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unsigned char *dp = buffer;
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unsigned val;
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if (get_cf_lock() < 0) {
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unsigned status = ace_readw(0x04);
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/* If CFDETECT is false, card is missing. */
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if (!(status & 0x0010)) {
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printf("** CompactFlash card not present. **\n");
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return 0;
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}
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printf("**** ACE locked away from me (STATUSREG=%04x)\n",
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status);
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return 0;
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}
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#ifdef DEBUG_SYSTEMACE
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printf("... systemace read %lu sectors at %lu\n", blkcnt, start);
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#endif
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retry = 2000;
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for (;;) {
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val = ace_readw(0x04);
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/* If CFDETECT is false, card is missing. */
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if (!(val & 0x0010)) {
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printf("**** ACE CompactFlash not found.\n");
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release_cf_lock();
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return 0;
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}
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/* If RDYFORCMD, then we are ready to go. */
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if (val & 0x0100)
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break;
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if (retry < 0) {
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printf("**** SystemACE not ready.\n");
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release_cf_lock();
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return 0;
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}
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udelay(1000);
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retry -= 1;
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}
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/* The SystemACE can only transfer 256 sectors at a time, so
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limit the current chunk of sectors. The blk_countdown
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variable is the number of sectors left to transfer. */
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blk_countdown = blkcnt;
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while (blk_countdown > 0) {
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unsigned trans = blk_countdown;
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if (trans > 256)
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trans = 256;
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#ifdef DEBUG_SYSTEMACE
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printf("... transfer %lu sector in a chunk\n", trans);
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#endif
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/* Write LBA block address */
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ace_writew((start >> 0) & 0xffff, 0x10);
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ace_writew((start >> 16) & 0x0fff, 0x12);
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/* NOTE: in the Write Sector count below, a count of 0
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causes a transfer of 256, so &0xff gives the right
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value for whatever transfer count we want. */
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/* Write sector count | ReadMemCardData. */
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ace_writew((trans & 0xff) | 0x0300, 0x14);
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/* Reset the configruation controller */
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val = ace_readw(0x18);
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val |= 0x0080;
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ace_writew(val, 0x18);
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retry = trans * 16;
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while (retry > 0) {
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int idx;
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/* Wait for buffer to become ready. */
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while (!(ace_readw(0x04) & 0x0020)) {
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udelay(100);
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}
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/* Read 16 words of 2bytes from the sector buffer. */
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for (idx = 0; idx < 16; idx += 1) {
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unsigned short val = ace_readw(0x40);
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*dp++ = val & 0xff;
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*dp++ = (val >> 8) & 0xff;
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}
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retry -= 1;
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}
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/* Clear the configruation controller reset */
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val = ace_readw(0x18);
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val &= ~0x0080;
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ace_writew(val, 0x18);
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/* Count the blocks we transfer this time. */
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start += trans;
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blk_countdown -= trans;
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}
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release_cf_lock();
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return blkcnt;
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}
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#endif /* CONFIG_SYSTEMACE */
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