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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / 1a4596601fd395f3afb8f82f3f840c5e00bdd57a / . / post / cpu / mpc83xx / ecc.c
blob: 76a3693aa40480c0fe08e95dc885ba64b60c90df [file] [log] [blame]
Michael Zaidman93c7e702010-04-07 18:30:08 +0300[diff] [blame]1/*
2 * (C) Copyright 2010
3 * Eastman Kodak Company, <www.kodak.com>
4 * Michael Zaidman, <michael.zaidman@kodak.com>
5 *
6 * The code is based on the cpu/mpc83xx/ecc.c written by
7 * Dave Liu <daveliu@freescale.com>
8 *
Wolfgang Denk1a459662013-07-08 09:37:19 +0200[diff] [blame^]9 * SPDX-License-Identifier: GPL-2.0+
Michael Zaidman93c7e702010-04-07 18:30:08 +0300[diff] [blame]10 */
11
12#include <common.h>
13#include <mpc83xx.h>
14#include <watchdog.h>
15#include <asm/io.h>
16#include <post.h>
17
18#if CONFIG_POST & CONFIG_SYS_POST_ECC
19/*
20 * We use the RAW I/O accessors where possible in order to
21 * achieve performance goal, since the test's execution time
22 * affects the board start up time.
23 */
24static inline void ecc_clear(ddr83xx_t *ddr)
25{
26 /* Clear capture registers */
27 __raw_writel(0, &ddr->capture_address);
28 __raw_writel(0, &ddr->capture_data_hi);
29 __raw_writel(0, &ddr->capture_data_lo);
30 __raw_writel(0, &ddr->capture_ecc);
31 __raw_writel(0, &ddr->capture_attributes);
32
33 /* Clear SBEC and set SBET to 1 */
34 out_be32(&ddr->err_sbe, 1 << ECC_ERROR_MAN_SBET_SHIFT);
35
36 /* Clear Error Detect register */
37 out_be32(&ddr->err_detect, ECC_ERROR_DETECT_MME |\
38 ECC_ERROR_DETECT_MBE |\
39 ECC_ERROR_DETECT_SBE |\
40 ECC_ERROR_DETECT_MSE);
41
42 isync();
43}
44
45int ecc_post_test(int flags)
46{
47 int ret = 0;
48 int int_state;
49 int errbit;
50 u32 pattern[2], writeback[2], retval[2];
51 ddr83xx_t *ddr = &((immap_t *)CONFIG_SYS_IMMR)->ddr;
52 volatile u64 *addr = (u64 *)CONFIG_SYS_POST_ECC_START_ADDR;
53
54 /* The pattern is written into memory to generate error */
55 pattern[0] = 0xfedcba98UL;
56 pattern[1] = 0x76543210UL;
57
58 /* After injecting error, re-initialize the memory with the value */
59 writeback[0] = ~pattern[0];
60 writeback[1] = ~pattern[1];
61
62 /* Check if ECC is enabled */
63 if (__raw_readl(&ddr->err_disable) & ECC_ERROR_ENABLE) {
64 debug("DDR's ECC is not enabled, skipping the ECC POST.\n");
65 return 0;
66 }
67
68 int_state = disable_interrupts();
69 icache_enable();
70
71#ifdef CONFIG_DDR_32BIT
72 /* It seems like no one really uses the CONFIG_DDR_32BIT mode */
73#error "Add ECC POST support for CONFIG_DDR_32BIT here!"
74#else
75 for (addr = (u64*)CONFIG_SYS_POST_ECC_START_ADDR, errbit=0;
76 addr < (u64*)CONFIG_SYS_POST_ECC_STOP_ADDR; addr++, errbit++ ) {
77
78 WATCHDOG_RESET();
79
80 ecc_clear(ddr);
81
82 /* Enable error injection */
83 setbits_be32(&ddr->ecc_err_inject, ECC_ERR_INJECT_EIEN);
84 sync();
85 isync();
86
87 /* Set bit to be injected */
88 if (errbit < 32) {
89 __raw_writel(1 << errbit, &ddr->data_err_inject_lo);
90 __raw_writel(0, &ddr->data_err_inject_hi);
91 } else {
92 __raw_writel(0, &ddr->data_err_inject_lo);
93 __raw_writel(1<<(errbit-32), &ddr->data_err_inject_hi);
94 }
95 sync();
96 isync();
97
98 /* Write memory location injecting SBE */
99 ppcDWstore((u32*)addr, pattern);
100 sync();
101
102 /* Disable error injection */
103 clrbits_be32(&ddr->ecc_err_inject, ECC_ERR_INJECT_EIEN);
104 sync();
105 isync();
106
107 /* Data read should generate SBE */
108 ppcDWload((u32*)addr, retval);
109 sync();
110
111 if (!(__raw_readl(&ddr->err_detect) & ECC_ERROR_DETECT_SBE) ||
112 (__raw_readl(&ddr->data_err_inject_hi) !=
113 (__raw_readl(&ddr->capture_data_hi) ^ pattern[0])) ||
114 (__raw_readl(&ddr->data_err_inject_lo) !=
115 (__raw_readl(&ddr->capture_data_lo) ^ pattern[1]))) {
116
117 post_log("ECC failed to detect SBE error at %08x, "
118 "SBE injection mask %08x-%08x, wrote "
119 "%08x-%08x, read %08x-%08x\n", addr,
120 ddr->data_err_inject_hi,
121 ddr->data_err_inject_lo,
122 pattern[0], pattern[1],
123 retval[0], retval[1]);
124
125 printf("ERR_DETECT Reg: %08x\n", ddr->err_detect);
126 printf("ECC CAPTURE_DATA Reg: %08x-%08x\n",
127 ddr->capture_data_hi, ddr->capture_data_lo);
128 ret = 1;
129 break;
130 }
131
132 /* Re-initialize the ECC memory */
133 ppcDWstore((u32*)addr, writeback);
134 sync();
135 isync();
136
137 errbit %= 63;
138 }
139#endif /* !CONFIG_DDR_32BIT */
140
141 ecc_clear(ddr);
142
143 icache_disable();
144
145 if (int_state)
146 enable_interrupts();
147
148 return ret;
149}
150#endif