2 * Copyright (c) 2004 Picture Elements, Inc.
3 * Stephen Williams (XXXXXXXXXXXXXXXX)
5 * This source code is free software; you can redistribute it
6 * and/or modify it in source code form under the terms of the GNU
7 * General Public License as published by the Free Software
8 * Foundation; either version 2 of the License, or (at your option)
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
23 * The Xilinx SystemACE chip support is activated by defining
24 * CONFIG_SYSTEMACE to turn on support, and CFG_SYSTEMACE_BASE
25 * to set the base address of the device. This code currently
26 * assumes that the chip is connected via a byte-wide bus.
28 * The CONFIG_SYSTEMACE also adds to fat support the device class
29 * "ace" that allows the user to execute "fatls ace 0" and the
30 * like. This works by making the systemace_get_dev function
31 * available to cmd_fat.c:get_dev and filling in a block device
32 * description that has all the bits needed for FAT support to
35 * According to Xilinx technical support, before accessing the
36 * SystemACE CF you need to set the following control bits:
44 # include <systemace.h>
48 #ifdef CONFIG_SYSTEMACE
51 * The ace_readw and writew functions read/write 16bit words, but the
52 * offset value is the BYTE offset as most used in the Xilinx
53 * datasheet for the SystemACE chip. The CFG_SYSTEMACE_BASE is defined
54 * to be the base address for the chip, usually in the local
57 static unsigned ace_readw(unsigned offset)
59 #if (CFG_SYSTEMACE_WIDTH == 8)
62 #if !defined(__BIG_ENDIAN)
63 temp =((u16)readb(CFG_SYSTEMACE_BASE+offset) << 8);
64 temp |= (u16)readb(CFG_SYSTEMACE_BASE+offset+1);
66 temp = (u16)readb(CFG_SYSTEMACE_BASE+offset);
67 temp |=((u16)readb(CFG_SYSTEMACE_BASE+offset+1) << 8);
71 return readw(CFG_SYSTEMACE_BASE+offset);
75 static void ace_writew(unsigned val, unsigned offset)
77 #if (CFG_SYSTEMACE_WIDTH == 8)
78 #if !defined(__BIG_ENDIAN)
79 writeb((u8)(val>>8), CFG_SYSTEMACE_BASE+offset);
80 writeb((u8)val, CFG_SYSTEMACE_BASE+offset+1);
82 writeb((u8)val, CFG_SYSTEMACE_BASE+offset);
83 writeb((u8)(val>>8), CFG_SYSTEMACE_BASE+offset+1);
86 writew(val, CFG_SYSTEMACE_BASE+offset);
92 static unsigned long systemace_read(int dev,
95 unsigned long *buffer);
97 static block_dev_desc_t systemace_dev = {0};
99 static int get_cf_lock(void)
103 /* CONTROLREG = LOCKREG */
104 unsigned val=ace_readw(0x18);
106 ace_writew((val&0xffff), 0x18);
108 /* Wait for MPULOCK in STATUSREG[15:0] */
109 while (! (ace_readw(0x04) & 0x0002)) {
121 static void release_cf_lock(void)
123 unsigned val=ace_readw(0x18);
125 ace_writew((val&0xffff), 0x18);
128 block_dev_desc_t * systemace_get_dev(int dev)
130 /* The first time through this, the systemace_dev object is
131 not yet initialized. In that case, fill it in. */
132 if (systemace_dev.blksz == 0) {
133 systemace_dev.if_type = IF_TYPE_UNKNOWN;
134 systemace_dev.dev = 0;
135 systemace_dev.part_type = PART_TYPE_UNKNOWN;
136 systemace_dev.type = DEV_TYPE_HARDDISK;
137 systemace_dev.blksz = 512;
138 systemace_dev.removable = 1;
139 systemace_dev.block_read = systemace_read;
141 init_part(&systemace_dev);
145 return &systemace_dev;
149 * This function is called (by dereferencing the block_read pointer in
150 * the dev_desc) to read blocks of data. The return value is the
151 * number of blocks read. A zero return indicates an error.
153 static unsigned long systemace_read(int dev,
155 unsigned long blkcnt,
156 unsigned long *buffer)
159 unsigned blk_countdown;
160 unsigned char*dp = (unsigned char*)buffer;
163 if (get_cf_lock() < 0) {
164 unsigned status = ace_readw(0x04);
166 /* If CFDETECT is false, card is missing. */
167 if (! (status&0x0010)) {
168 printf("** CompactFlash card not present. **\n");
172 printf("**** ACE locked away from me (STATUSREG=%04x)\n", status);
176 #ifdef DEBUG_SYSTEMACE
177 printf("... systemace read %lu sectors at %lu\n", blkcnt, start);
182 val = ace_readw(0x04);
184 /* If CFDETECT is false, card is missing. */
185 if (! (val & 0x0010)) {
186 printf("**** ACE CompactFlash not found.\n");
191 /* If RDYFORCMD, then we are ready to go. */
196 printf("**** SystemACE not ready.\n");
205 /* The SystemACE can only transfer 256 sectors at a time, so
206 limit the current chunk of sectors. The blk_countdown
207 variable is the number of sectors left to transfer. */
209 blk_countdown = blkcnt;
210 while (blk_countdown > 0) {
211 unsigned trans = blk_countdown;
213 if (trans > 256) trans = 256;
215 #ifdef DEBUG_SYSTEMACE
216 printf("... transfer %lu sector in a chunk\n", trans);
218 /* Write LBA block address */
219 ace_writew((start>> 0) & 0xffff, 0x10);
220 ace_writew((start>>16) & 0x00ff, 0x12);
222 /* NOTE: in the Write Sector count below, a count of 0
223 causes a transfer of 256, so &0xff gives the right
224 value for whatever transfer count we want. */
226 /* Write sector count | ReadMemCardData. */
227 ace_writew((trans&0xff) | 0x0300, 0x14);
229 /* Reset the configruation controller */
230 val = ace_readw(0x18);
232 ace_writew(val, 0x18);
238 /* Wait for buffer to become ready. */
239 while (! (ace_readw(0x04) & 0x0020)) {
243 /* Read 16 words of 2bytes from the sector buffer. */
244 for (idx = 0 ; idx < 16 ; idx += 1) {
245 unsigned short val = ace_readw(0x40);
247 *dp++ = (val>>8) & 0xff;
253 /* Clear the configruation controller reset */
254 val = ace_readw(0x18);
256 ace_writew(val, 0x18);
258 /* Count the blocks we transfer this time. */
260 blk_countdown -= trans;
267 #endif /* CONFIG_SYSTEMACE */