2 * Copyright (c) 2004 Picture Elements, Inc.
3 * Stephen Williams (XXXXXXXXXXXXXXXX)
5 * SPDX-License-Identifier: GPL-2.0+
9 * The Xilinx SystemACE chip support is activated by defining
10 * CONFIG_SYSTEMACE to turn on support, and CONFIG_SYS_SYSTEMACE_BASE
11 * to set the base address of the device. This code currently
12 * assumes that the chip is connected via a byte-wide bus.
14 * The CONFIG_SYSTEMACE also adds to fat support the device class
15 * "ace" that allows the user to execute "fatls ace 0" and the
16 * like. This works by making the systemace_get_dev function
17 * available to cmd_fat.c:get_dev and filling in a block device
18 * description that has all the bits needed for FAT support to
21 * According to Xilinx technical support, before accessing the
22 * SystemACE CF you need to set the following control bits:
30 #include <systemace.h>
35 * The ace_readw and writew functions read/write 16bit words, but the
36 * offset value is the BYTE offset as most used in the Xilinx
37 * datasheet for the SystemACE chip. The CONFIG_SYS_SYSTEMACE_BASE is defined
38 * to be the base address for the chip, usually in the local
42 static u32 base = CONFIG_SYS_SYSTEMACE_BASE;
43 static u32 width = CONFIG_SYS_SYSTEMACE_WIDTH;
45 static void ace_writew(u16 val, unsigned off)
48 #if !defined(__BIG_ENDIAN)
49 writeb(val >> 8, base + off);
50 writeb(val, base + off + 1);
52 writeb(val, base + off);
53 writeb(val >> 8, base + off + 1);
56 out16(base + off, val);
59 static u16 ace_readw(unsigned off)
62 #if !defined(__BIG_ENDIAN)
63 return (readb(base + off) << 8) | readb(base + off + 1);
65 return readb(base + off) | (readb(base + off + 1) << 8);
69 return in16(base + off);
72 static unsigned long systemace_read(struct blk_desc *block_dev,
73 unsigned long start, lbaint_t blkcnt,
76 static struct blk_desc systemace_dev = { 0 };
78 static int get_cf_lock(void)
82 /* CONTROLREG = LOCKREG */
83 unsigned val = ace_readw(0x18);
85 ace_writew((val & 0xffff), 0x18);
87 /* Wait for MPULOCK in STATUSREG[15:0] */
88 while (!(ace_readw(0x04) & 0x0002)) {
100 static void release_cf_lock(void)
102 unsigned val = ace_readw(0x18);
104 ace_writew((val & 0xffff), 0x18);
107 #ifdef CONFIG_PARTITIONS
108 struct blk_desc *systemace_get_dev(int dev)
110 /* The first time through this, the systemace_dev object is
111 not yet initialized. In that case, fill it in. */
112 if (systemace_dev.blksz == 0) {
113 systemace_dev.if_type = IF_TYPE_UNKNOWN;
114 systemace_dev.devnum = 0;
115 systemace_dev.part_type = PART_TYPE_UNKNOWN;
116 systemace_dev.type = DEV_TYPE_HARDDISK;
117 systemace_dev.blksz = 512;
118 systemace_dev.log2blksz = LOG2(systemace_dev.blksz);
119 systemace_dev.removable = 1;
120 systemace_dev.block_read = systemace_read;
123 * Ensure the correct bus mode (8/16 bits) gets enabled
125 ace_writew(width == 8 ? 0 : 0x0001, 0);
127 part_init(&systemace_dev);
131 return &systemace_dev;
135 static int systemace_get_devp(int dev, struct blk_desc **descp)
137 *descp = systemace_get_dev(dev);
143 * This function is called (by dereferencing the block_read pointer in
144 * the dev_desc) to read blocks of data. The return value is the
145 * number of blocks read. A zero return indicates an error.
147 static unsigned long systemace_read(struct blk_desc *block_dev,
148 unsigned long start, lbaint_t blkcnt,
152 unsigned blk_countdown;
153 unsigned char *dp = buffer;
156 if (get_cf_lock() < 0) {
157 unsigned status = ace_readw(0x04);
159 /* If CFDETECT is false, card is missing. */
160 if (!(status & 0x0010)) {
161 printf("** CompactFlash card not present. **\n");
165 printf("**** ACE locked away from me (STATUSREG=%04x)\n",
169 #ifdef DEBUG_SYSTEMACE
170 printf("... systemace read %lu sectors at %lu\n", blkcnt, start);
175 val = ace_readw(0x04);
177 /* If CFDETECT is false, card is missing. */
178 if (!(val & 0x0010)) {
179 printf("**** ACE CompactFlash not found.\n");
184 /* If RDYFORCMD, then we are ready to go. */
189 printf("**** SystemACE not ready.\n");
198 /* The SystemACE can only transfer 256 sectors at a time, so
199 limit the current chunk of sectors. The blk_countdown
200 variable is the number of sectors left to transfer. */
202 blk_countdown = blkcnt;
203 while (blk_countdown > 0) {
204 unsigned trans = blk_countdown;
209 #ifdef DEBUG_SYSTEMACE
210 printf("... transfer %lu sector in a chunk\n", trans);
212 /* Write LBA block address */
213 ace_writew((start >> 0) & 0xffff, 0x10);
214 ace_writew((start >> 16) & 0x0fff, 0x12);
216 /* NOTE: in the Write Sector count below, a count of 0
217 causes a transfer of 256, so &0xff gives the right
218 value for whatever transfer count we want. */
220 /* Write sector count | ReadMemCardData. */
221 ace_writew((trans & 0xff) | 0x0300, 0x14);
224 * For FPGA configuration via SystemACE is reset unacceptable
225 * CFGDONE bit in STATUSREG is not set to 1.
227 #ifndef SYSTEMACE_CONFIG_FPGA
228 /* Reset the configruation controller */
229 val = ace_readw(0x18);
231 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;
268 U_BOOT_LEGACY_BLK(systemace) = {
269 .if_typename = "ace",
270 .if_type = IF_TYPE_SYSTEMACE,
272 .get_dev = systemace_get_devp,