3 * Developed for DENX Software Engineering GmbH.
5 * Author: Pavel Kolesnikov <concord@emcraft.com>
7 * See file CREDITS for list of people who contributed to this
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
26 /* define DEBUG for debugging output (obviously ;-)) */
34 #if defined(CONFIG_POST) && (defined(CONFIG_440EPX) || defined(CONFIG_440GRX))
38 #if CONFIG_POST & CFG_POST_ECC
43 * This test performs the checks ECC facility of memory.
45 #include <asm/processor.h>
50 DECLARE_GLOBAL_DATA_PTR;
52 const static unsigned char syndrome_codes[] = {
53 0xF4, 0XF1, 0XEC, 0XEA, 0XE9, 0XE6, 0XE5, 0XE3,
54 0XDC, 0XDA, 0XD9, 0XD6, 0XD5, 0XD3, 0XCE, 0XCB,
55 0xB5, 0XB0, 0XAD, 0XAB, 0XA8, 0XA7, 0XA4, 0XA2,
56 0X9D, 0X9B, 0X98, 0X97, 0X94, 0X92, 0X8F, 0X8A,
57 0x75, 0x70, 0X6D, 0X6B, 0X68, 0X67, 0X64, 0X62,
58 0X5E, 0X5B, 0X58, 0X57, 0X54, 0X52, 0X4F, 0X4A,
59 0x34, 0x31, 0X2C, 0X2A, 0X29, 0X26, 0X25, 0X23,
60 0X1C, 0X1A, 0X19, 0X16, 0X15, 0X13, 0X0E, 0X0B,
61 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01
64 #define ECC_START_ADDR 0x10
65 #define ECC_STOP_ADDR 0x2000
66 #define ECC_PATTERN 0x01010101
67 #define ECC_PATTERN_CORR 0x11010101
68 #define ECC_PATTERN_UNCORR 0xF1010101
70 static int test_ecc_error(void)
73 unsigned long hdata, ldata, haddr, laddr;
78 mfsdram(DDR0_23, value);
80 for (bit = 0; bit < sizeof(syndrome_codes); bit++)
81 if (syndrome_codes[bit] == ((value >> 16) & 0xff))
84 mfsdram(DDR0_00, value);
86 if (value & DDR0_00_INT_STATUS_BIT0) {
87 debug("Bit0. A single access outside the defined PHYSICAL"
88 " memory space detected\n");
89 mfsdram(DDR0_32, laddr);
90 mfsdram(DDR0_33, haddr);
91 debug(" addr = 0x%08x%08x\n", haddr, laddr);
94 if (value & DDR0_00_INT_STATUS_BIT1) {
95 debug("Bit1. Multiple accesses outside the defined PHYSICAL"
96 " memory space detected\n");
99 if (value & DDR0_00_INT_STATUS_BIT2) {
100 debug("Bit2. Single correctable ECC event detected\n");
101 mfsdram(DDR0_38, laddr);
102 mfsdram(DDR0_39, haddr);
103 mfsdram(DDR0_40, ldata);
104 mfsdram(DDR0_41, hdata);
105 debug(" 0x%08x - 0x%08x%08x, bit - %d\n",
106 laddr, hdata, ldata, bit);
109 if (value & DDR0_00_INT_STATUS_BIT3) {
110 debug("Bit3. Multiple correctable ECC events detected\n");
111 mfsdram(DDR0_38, laddr);
112 mfsdram(DDR0_39, haddr);
113 mfsdram(DDR0_40, ldata);
114 mfsdram(DDR0_41, hdata);
115 debug(" 0x%08x - 0x%08x%08x, bit - %d\n",
116 laddr, hdata, ldata, bit);
119 if (value & DDR0_00_INT_STATUS_BIT4) {
120 debug("Bit4. Single uncorrectable ECC event detected\n");
121 mfsdram(DDR0_34, laddr);
122 mfsdram(DDR0_35, haddr);
123 mfsdram(DDR0_36, ldata);
124 mfsdram(DDR0_37, hdata);
125 debug(" 0x%08x - 0x%08x%08x, bit - %d\n",
126 laddr, hdata, ldata, bit);
129 if (value & DDR0_00_INT_STATUS_BIT5) {
130 debug("Bit5. Multiple uncorrectable ECC events detected\n");
131 mfsdram(DDR0_34, laddr);
132 mfsdram(DDR0_35, haddr);
133 mfsdram(DDR0_36, ldata);
134 mfsdram(DDR0_37, hdata);
135 debug(" 0x%08x - 0x%08x%08x, bit - %d\n",
136 laddr, hdata, ldata, bit);
139 if (value & DDR0_00_INT_STATUS_BIT6) {
140 debug("Bit6. DRAM initialization complete\n");
144 /* error status cleared */
145 mfsdram(DDR0_00, value);
146 mtsdram(DDR0_00, value | DDR0_00_INT_ACK_ALL);
151 static int test_ecc(unsigned long ecc_addr)
154 volatile unsigned *const ecc_mem = (volatile unsigned *) ecc_addr;
162 debug("Entering test_ecc(0x%08lX)\n", ecc_addr);
163 out_be32(ecc_mem, ECC_PATTERN);
164 out_be32(ecc_mem + 1, ECC_PATTERN);
166 pret = test_ecc_error();
168 debug("pret: expected 0, got %d\n", pret);
171 /* test for correctable error */
172 /* disconnect from ecc storage */
173 mfsdram(DDR0_22, value);
174 mtsdram(DDR0_22, (value & ~DDR0_22_CTRL_RAW_MASK)
175 | DDR0_22_CTRL_RAW_ECC_DISABLE);
177 /* creating (correctable) single-bit error */
178 out_be32(ecc_mem, ECC_PATTERN_CORR);
181 mfsdram(DDR0_22, value);
182 mtsdram(DDR0_22, (value & ~DDR0_22_CTRL_RAW_MASK)
183 | DDR0_22_CTRL_RAW_ECC_ENABLE);
188 pret = test_ecc_error();
189 /* if read data ok, 1 correctable error must be fixed */
191 debug("pret: expected 3, got %d\n", pret);
194 /* test for uncorrectable error */
195 /* disconnect from ecc storage */
196 mfsdram(DDR0_22, value);
197 mtsdram(DDR0_22, (value & ~DDR0_22_CTRL_RAW_MASK)
198 | DDR0_22_CTRL_RAW_NO_ECC_RAM);
200 /* creating (uncorrectable) multiple-bit error */
201 out_be32(ecc_mem, ECC_PATTERN_UNCORR);
204 mfsdram(DDR0_22, value);
205 mtsdram(DDR0_22, (value & ~DDR0_22_CTRL_RAW_MASK)
206 | DDR0_22_CTRL_RAW_ECC_ENABLE);
211 pret = test_ecc_error();
212 /* info about uncorrectable error must appear */
214 debug("pret: expected 5, got %d\n", pret);
217 /* remove error from SDRAM */
218 out_be32(ecc_mem, ECC_PATTERN);
219 /* clear error caused by read-modify-write */
220 mfsdram(DDR0_00, value);
221 mtsdram(DDR0_00, value | DDR0_00_INT_ACK_ALL);
228 int ecc_post_test (int flags)
237 mfsdram(DDR0_22, value);
238 if (0x3 != DDR0_22_CTRL_RAW_DECODE(value)) {
239 debug("SDRAM ECC not enabled, skipping ECC POST.\n");
244 mfsdram(DDR0_01, value);
245 mtsdram(DDR0_01, (value & ~DDR0_01_INT_MASK_MASK)
246 | DDR0_01_INT_MASK_ALL_OFF);
248 /* clear error status */
249 mfsdram(DDR0_00, value);
250 mtsdram(DDR0_00, value | DDR0_00_INT_ACK_ALL);
252 for (iaddr = ECC_START_ADDR; iaddr <= ECC_STOP_ADDR; iaddr += iaddr) {
253 ret = test_ecc(iaddr);
258 * Clear possible errors resulting from ECC testing.
259 * If not done, then we could get an interrupt later on when
260 * exceptions are enabled.
262 set_mcsr(get_mcsr());
266 #endif /* CONFIG_POST & CFG_POST_ECC */
267 #endif /* defined(CONFIG_POST) && ... */