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 uint8_t 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 0x61010101
70 inline static void disable_ecc(void)
74 sync(); /* Wait for any pending memory accesses to complete. */
75 mfsdram(DDR0_22, value);
76 mtsdram(DDR0_22, (value & ~DDR0_22_CTRL_RAW_MASK)
77 | DDR0_22_CTRL_RAW_ECC_DISABLE);
80 inline static void clear_and_enable_ecc(void)
84 sync(); /* Wait for any pending memory accesses to complete. */
85 mfsdram(DDR0_00, value);
86 mtsdram(DDR0_00, value | DDR0_00_INT_ACK_ALL);
87 mfsdram(DDR0_22, value);
88 mtsdram(DDR0_22, (value & ~DDR0_22_CTRL_RAW_MASK)
89 | DDR0_22_CTRL_RAW_ECC_ENABLE);
92 static uint32_t get_ecc_status(void)
97 uint32_t hdata, ldata, haddr, laddr;
101 mfsdram(DDR0_00, int_status);
102 int_status &= DDR0_00_INT_STATUS_MASK;
105 if (int_status & (DDR0_00_INT_STATUS_BIT0 | DDR0_00_INT_STATUS_BIT1)) {
106 mfsdram(DDR0_32, laddr);
107 mfsdram(DDR0_33, haddr);
109 if (int_status & DDR0_00_INT_STATUS_BIT1)
110 debug("Multiple accesses");
112 debug("A single access");
114 debug(" outside the defined physical memory space detected\n"
115 " addr = 0x%01x%08x\n", haddr, laddr);
117 if (int_status & (DDR0_00_INT_STATUS_BIT2 | DDR0_00_INT_STATUS_BIT3)) {
120 mfsdram(DDR0_23, value);
121 syndrome = (value >> 16) & 0xff;
122 for (bit = 0; bit < sizeof(syndrome_codes); bit++)
123 if (syndrome_codes[bit] == syndrome)
126 mfsdram(DDR0_38, laddr);
127 mfsdram(DDR0_39, haddr);
129 mfsdram(DDR0_40, ldata);
130 mfsdram(DDR0_41, hdata);
131 if (int_status & DDR0_00_INT_STATUS_BIT3)
132 debug("Multiple correctable ECC events");
134 debug("Single correctable ECC event");
136 debug(" detected\n 0x%01x%08x - 0x%08x%08x, bit - %d\n",
137 haddr, laddr, hdata, ldata, bit);
139 if (int_status & (DDR0_00_INT_STATUS_BIT4 | DDR0_00_INT_STATUS_BIT5)) {
140 mfsdram(DDR0_23, value);
141 syndrome = (value >> 8) & 0xff;
142 mfsdram(DDR0_34, laddr);
143 mfsdram(DDR0_35, haddr);
145 mfsdram(DDR0_36, ldata);
146 mfsdram(DDR0_37, hdata);
147 if (int_status & DDR0_00_INT_STATUS_BIT5)
148 debug("Multiple uncorrectable ECC events");
150 debug("Single uncorrectable ECC event");
152 debug(" detected\n 0x%01x%08x - 0x%08x%08x, "
153 "syndrome - 0x%02x\n",
154 haddr, laddr, hdata, ldata, syndrome);
156 if (int_status & DDR0_00_INT_STATUS_BIT6)
157 debug("DRAM initialization complete\n");
158 #endif /* defined(DEBUG) */
163 static int test_ecc(uint32_t ecc_addr)
166 volatile uint32_t *const ecc_mem = (volatile uint32_t *)ecc_addr;
171 debug("Entering test_ecc(0x%08x)\n", ecc_addr);
172 /* Set up correct ECC in memory */
174 clear_and_enable_ecc();
175 out_be32(ecc_mem, ECC_PATTERN);
176 out_be32(ecc_mem + 1, ECC_PATTERN);
178 /* Verify no ECC error reading back */
179 value = in_be32(ecc_mem);
181 if (ECC_PATTERN != value) {
182 debug("Data read error (no-error case): "
183 "expected 0x%08x, read 0x%08x\n", ECC_PATTERN, value);
186 value = get_ecc_status();
187 if (0x00000000 != value) {
188 /* Expected no ECC status reported */
189 debug("get_ecc_status(): expected 0x%08x, got 0x%08x\n",
194 /* Test for correctable error by creating a one-bit error */
195 out_be32(ecc_mem, ECC_PATTERN_CORR);
196 clear_and_enable_ecc();
197 value = in_be32(ecc_mem);
199 /* Test that the corrected data was read */
200 if (ECC_PATTERN != value) {
201 debug("Data read error (correctable-error case): "
202 "expected 0x%08x, read 0x%08x\n", ECC_PATTERN, value);
205 value = get_ecc_status();
206 if ((DDR0_00_INT_STATUS_BIT2 | DDR0_00_INT_STATUS_BIT7) != value) {
207 /* Expected a single correctable error reported */
208 debug("get_ecc_status(): expected 0x%08x, got 0x%08x\n",
209 DDR0_00_INT_STATUS_BIT2, value);
213 /* Test for uncorrectable error by creating a two-bit error */
214 out_be32(ecc_mem, ECC_PATTERN_UNCORR);
215 clear_and_enable_ecc();
216 value = in_be32(ecc_mem);
218 /* Test that the corrected data was read */
219 if (ECC_PATTERN_UNCORR != value) {
220 debug("Data read error (uncorrectable-error case): "
221 "expected 0x%08x, read 0x%08x\n", ECC_PATTERN_UNCORR,
225 value = get_ecc_status();
226 if ((DDR0_00_INT_STATUS_BIT4 | DDR0_00_INT_STATUS_BIT7) != value) {
227 /* Expected a single uncorrectable error reported */
228 debug("get_ecc_status(): expected 0x%08x, got 0x%08x\n",
229 DDR0_00_INT_STATUS_BIT4, value);
233 /* Remove error from SDRAM and enable ECC. */
234 out_be32(ecc_mem, ECC_PATTERN);
235 clear_and_enable_ecc();
240 int ecc_post_test(int flags)
246 mfsdram(DDR0_22, value);
247 if (0x3 != DDR0_22_CTRL_RAW_DECODE(value)) {
248 debug("SDRAM ECC not enabled, skipping ECC POST.\n");
252 /* Mask all interrupts. */
253 mfsdram(DDR0_01, value);
254 mtsdram(DDR0_01, (value & ~DDR0_01_INT_MASK_MASK)
255 | DDR0_01_INT_MASK_ALL_OFF);
257 for (iaddr = ECC_START_ADDR; iaddr <= ECC_STOP_ADDR; iaddr += iaddr) {
258 ret = test_ecc(iaddr);
263 * Clear possible errors resulting from ECC testing. (If not done, we
264 * we could get an interrupt later on when exceptions are enabled.)
266 set_mcsr(get_mcsr());
267 debug("ecc_post_test() returning %d\n", ret);
270 #endif /* CONFIG_POST & CFG_POST_ECC */
271 #endif /* defined(CONFIG_POST) && ... */