/* * (C) Copyright 2010 * Stefan Roese, DENX Software Engineering, sr@denx.de. * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA * */ #include #include #include #include #include #if defined(CONFIG_SDRAM_PPC4xx_IBM_DDR) || \ defined(CONFIG_SDRAM_PPC4xx_IBM_DDR2) #if defined(CONFIG_DDR_ECC) || defined(CONFIG_SDRAM_ECC) #if defined(CONFIG_405EX) /* * Currently only 405EX uses 16bit data bus width as an alternative * option to 32bit data width (SDRAM0_MCOPT1_WDTH) */ #define SDRAM_DATA_ALT_WIDTH 2 #else #define SDRAM_DATA_ALT_WIDTH 8 #endif #if defined(CONFIG_SYS_OCM_BASE) #define CONFIG_FUNC_ISRAM_ADDR CONFIG_SYS_OCM_BASE #endif #if defined(CONFIG_SYS_ISRAM_BASE) #define CONFIG_FUNC_ISRAM_ADDR CONFIG_SYS_ISRAM_BASE #endif #if !defined(CONFIG_FUNC_ISRAM_ADDR) #error "No internal SRAM/OCM provided!" #endif #define force_inline inline __attribute__ ((always_inline)) static inline void machine_check_disable(void) { mtmsr(mfmsr() & ~MSR_ME); } static inline void machine_check_enable(void) { mtmsr(mfmsr() | MSR_ME); } /* * These helper functions need to be inlined, since they * are called from the functions running from internal SRAM. * SDRAM operation is forbidden at that time, so calling * functions in SDRAM has to be avoided. */ static force_inline void wait_ddr_idle(void) { u32 val; do { mfsdram(SDRAM_MCSTAT, val); } while ((val & SDRAM_MCSTAT_IDLE_MASK) == SDRAM_MCSTAT_IDLE_NOT); } static force_inline void recalibrate_ddr(void) { u32 val; /* * Rewrite RQDC & RFDC to calibrate again. If this is not * done, the SDRAM controller is working correctly after * changing the MCOPT1_MCHK bits. */ mfsdram(SDRAM_RQDC, val); mtsdram(SDRAM_RQDC, val); mfsdram(SDRAM_RFDC, val); mtsdram(SDRAM_RFDC, val); } static force_inline void set_mcopt1_mchk(u32 bits) { u32 val; wait_ddr_idle(); mfsdram(SDRAM_MCOPT1, val); mtsdram(SDRAM_MCOPT1, (val & ~SDRAM_MCOPT1_MCHK_MASK) | bits); recalibrate_ddr(); } /* * The next 2 functions are copied to internal SRAM/OCM and run * there. No function calls allowed here. No SDRAM acitivity should * be done here. */ static void inject_ecc_error(void *ptr, int par) { /* * Taken from PPC460EX/EXr/GT users manual (Rev 1.21) * 22.2.17.13 ECC Diagnostics * * Items 1 ... 5 are already done by now, running from RAM * with ECC enabled */ out_be32(ptr, 0x00000000); in_be32(ptr); /* 6. Set memory controller to no error checking */ set_mcopt1_mchk(SDRAM_MCOPT1_MCHK_NON); /* 7. Modify one or two bits for error simulation */ if (par == 1) out_be32(ptr, in_be32(ptr) ^ 0x00000001); else out_be32(ptr, in_be32(ptr) ^ 0x00000003); /* 8. Wait for SDRAM idle */ in_be32(ptr); set_mcopt1_mchk(SDRAM_MCOPT1_MCHK_CHK_REP); /* Wait for SDRAM idle */ wait_ddr_idle(); /* Continue with 9. in calling function... */ } static void rewrite_ecc_parity(void *ptr, int par) { u32 current_address = (u32)ptr; u32 end_address; u32 address_increment; u32 mcopt1; /* * Fill ECC parity byte again. Otherwise further accesses to * the failure address will result in exceptions. */ /* Wait for SDRAM idle */ in_be32(0x00000000); set_mcopt1_mchk(SDRAM_MCOPT1_MCHK_GEN); /* ECC bit set method for non-cached memory */ mfsdram(SDRAM_MCOPT1, mcopt1); if ((mcopt1 & SDRAM_MCOPT1_DMWD_MASK) == SDRAM_MCOPT1_DMWD_32) address_increment = 4; else address_increment = SDRAM_DATA_ALT_WIDTH; end_address = current_address + CONFIG_SYS_CACHELINE_SIZE; while (current_address < end_address) { *((unsigned long *)current_address) = 0; current_address += address_increment; } set_mcopt1_mchk(SDRAM_MCOPT1_MCHK_CHK_REP); /* Wait for SDRAM idle */ wait_ddr_idle(); } static int do_ecctest(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { u32 old_val; u32 val; u32 *ptr; void (*sram_func)(u32 *, int); int error; if (argc < 3) { return cmd_usage(cmdtp); } ptr = (u32 *)simple_strtoul(argv[1], NULL, 16); error = simple_strtoul(argv[2], NULL, 16); if ((error < 1) || (error > 2)) { return cmd_usage(cmdtp); } printf("Using address %p for %d bit ECC error injection\n", ptr, error); /* * Save value to restore it later on */ old_val = in_be32(ptr); /* * Copy ECC injection function into internal SRAM/OCM */ sram_func = (void *)CONFIG_FUNC_ISRAM_ADDR; memcpy((void *)CONFIG_FUNC_ISRAM_ADDR, inject_ecc_error, 0x10000); /* * Disable interrupts and exceptions before calling this * function in internal SRAM/OCM */ disable_interrupts(); machine_check_disable(); eieio(); /* * Jump to ECC simulation function in internal SRAM/OCM */ (*sram_func)(ptr, error); /* 10. Read the corresponding address */ val = in_be32(ptr); /* * Read and print ECC status register/info: * The faulting address is only known upon uncorrectable ECC * errors. */ mfsdram(SDRAM_ECCES, val); if (val & SDRAM_ECCES_CE) printf("ECC: Correctable error\n"); if (val & SDRAM_ECCES_UE) { printf("ECC: Uncorrectable error at 0x%02x%08x\n", mfdcr(SDRAM_ERRADDULL), mfdcr(SDRAM_ERRADDLLL)); } /* * Clear pending interrupts/exceptions */ mtsdram(SDRAM_ECCES, 0xffffffff); mtdcr(SDRAM_ERRSTATLL, 0xff000000); set_mcsr(get_mcsr()); /* Now enable interrupts and exceptions again */ eieio(); machine_check_enable(); enable_interrupts(); /* * The ECC parity byte need to be re-written for the * corresponding address. Otherwise future accesses to it * will result in exceptions. * * Jump to ECC parity generation function */ memcpy((void *)CONFIG_FUNC_ISRAM_ADDR, rewrite_ecc_parity, 0x10000); (*sram_func)(ptr, 0); /* * Restore value in corresponding address */ out_be32(ptr, old_val); return 0; } U_BOOT_CMD( ecctest, 3, 0, do_ecctest, "Test ECC by single and double error bit injection", "address 1/2" ); #endif /* defined(CONFIG_DDR_ECC) || defined(CONFIG_SDRAM_ECC) */ #endif /* defined(CONFIG_SDRAM_PPC4xx_IBM_DDR)... */