--- /dev/null
+/*
+ * (C) Copyright 2010-2011 Texas Instruments, <www.ti.com>
+ * Mansoor Ahamed <mansoor.ahamed@ti.com>
+ *
+ * BCH Error Location Module (ELM) support.
+ *
+ * NOTE:
+ * 1. Supports only continuous mode. Dont see need for page mode in uboot
+ * 2. Supports only syndrome polynomial 0. i.e. poly local variable is
+ * always set to ELM_DEFAULT_POLY. Dont see need for other polynomial
+ * sets in uboot
+ *
+ * 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 <common.h>
+#include <asm/io.h>
+#include <asm/errno.h>
+#include <asm/arch/cpu.h>
+#include <asm/arch/omap_gpmc.h>
+#include <asm/arch/elm.h>
+
+#define ELM_DEFAULT_POLY (0)
+
+struct elm *elm_cfg;
+
+/**
+ * elm_load_syndromes - Load BCH syndromes based on nibble selection
+ * @syndrome: BCH syndrome
+ * @nibbles:
+ * @poly: Syndrome Polynomial set to use
+ *
+ * Load BCH syndromes based on nibble selection
+ */
+static void elm_load_syndromes(u8 *syndrome, u32 nibbles, u8 poly)
+{
+ u32 *ptr;
+ u32 val;
+
+ /* reg 0 */
+ ptr = &elm_cfg->syndrome_fragments[poly].syndrome_fragment_x[0];
+ val = syndrome[0] | (syndrome[1] << 8) | (syndrome[2] << 16) |
+ (syndrome[3] << 24);
+ writel(val, ptr);
+ /* reg 1 */
+ ptr = &elm_cfg->syndrome_fragments[poly].syndrome_fragment_x[1];
+ val = syndrome[4] | (syndrome[5] << 8) | (syndrome[6] << 16) |
+ (syndrome[7] << 24);
+ writel(val, ptr);
+
+ /* BCH 8-bit with 26 nibbles (4*8=32) */
+ if (nibbles > 13) {
+ /* reg 2 */
+ ptr = &elm_cfg->syndrome_fragments[poly].syndrome_fragment_x[2];
+ val = syndrome[8] | (syndrome[9] << 8) | (syndrome[10] << 16) |
+ (syndrome[11] << 24);
+ writel(val, ptr);
+ /* reg 3 */
+ ptr = &elm_cfg->syndrome_fragments[poly].syndrome_fragment_x[3];
+ val = syndrome[12] | (syndrome[13] << 8) |
+ (syndrome[14] << 16) | (syndrome[15] << 24);
+ writel(val, ptr);
+ }
+
+ /* BCH 16-bit with 52 nibbles (7*8=56) */
+ if (nibbles > 26) {
+ /* reg 4 */
+ ptr = &elm_cfg->syndrome_fragments[poly].syndrome_fragment_x[4];
+ val = syndrome[16] | (syndrome[17] << 8) |
+ (syndrome[18] << 16) | (syndrome[19] << 24);
+ writel(val, ptr);
+
+ /* reg 5 */
+ ptr = &elm_cfg->syndrome_fragments[poly].syndrome_fragment_x[5];
+ val = syndrome[20] | (syndrome[21] << 8) |
+ (syndrome[22] << 16) | (syndrome[23] << 24);
+ writel(val, ptr);
+
+ /* reg 6 */
+ ptr = &elm_cfg->syndrome_fragments[poly].syndrome_fragment_x[6];
+ val = syndrome[24] | (syndrome[25] << 8) |
+ (syndrome[26] << 16) | (syndrome[27] << 24);
+ writel(val, ptr);
+ }
+}
+
+/**
+ * elm_check_errors - Check for BCH errors and return error locations
+ * @syndrome: BCH syndrome
+ * @nibbles:
+ * @error_count: Returns number of errrors in the syndrome
+ * @error_locations: Returns error locations (in decimal) in this array
+ *
+ * Check the provided syndrome for BCH errors and return error count
+ * and locations in the array passed. Returns -1 if error is not correctable,
+ * else returns 0
+ */
+int elm_check_error(u8 *syndrome, u32 nibbles, u32 *error_count,
+ u32 *error_locations)
+{
+ u8 poly = ELM_DEFAULT_POLY;
+ s8 i;
+ u32 location_status;
+
+ elm_load_syndromes(syndrome, nibbles, poly);
+
+ /* start processing */
+ writel((readl(&elm_cfg->syndrome_fragments[poly].syndrome_fragment_x[6])
+ | ELM_SYNDROME_FRAGMENT_6_SYNDROME_VALID),
+ &elm_cfg->syndrome_fragments[poly].syndrome_fragment_x[6]);
+
+ /* wait for processing to complete */
+ while ((readl(&elm_cfg->irqstatus) & (0x1 << poly)) != 0x1)
+ ;
+ /* clear status */
+ writel((readl(&elm_cfg->irqstatus) | (0x1 << poly)),
+ &elm_cfg->irqstatus);
+
+ /* check if correctable */
+ location_status = readl(&elm_cfg->error_location[poly].location_status);
+ if (!(location_status & ELM_LOCATION_STATUS_ECC_CORRECTABLE_MASK))
+ return -1;
+
+ /* get error count */
+ *error_count = readl(&elm_cfg->error_location[poly].location_status) &
+ ELM_LOCATION_STATUS_ECC_NB_ERRORS_MASK;
+
+ for (i = 0; i < *error_count; i++) {
+ error_locations[i] =
+ readl(&elm_cfg->error_location[poly].error_location_x[i]);
+ }
+
+ return 0;
+}
+
+
+/**
+ * elm_config - Configure ELM module
+ * @level: 4 / 8 / 16 bit BCH
+ *
+ * Configure ELM module based on BCH level.
+ * Set mode as continuous mode.
+ * Currently we are using only syndrome 0 and syndromes 1 to 6 are not used.
+ * Also, the mode is set only for syndrome 0
+ */
+int elm_config(enum bch_level level)
+{
+ u32 val;
+ u8 poly = ELM_DEFAULT_POLY;
+ u32 buffer_size = 0x7FF;
+
+ /* config size and level */
+ val = (u32)(level) & ELM_LOCATION_CONFIG_ECC_BCH_LEVEL_MASK;
+ val |= ((buffer_size << ELM_LOCATION_CONFIG_ECC_SIZE_POS) &
+ ELM_LOCATION_CONFIG_ECC_SIZE_MASK);
+ writel(val, &elm_cfg->location_config);
+
+ /* config continous mode */
+ /* enable interrupt generation for syndrome polynomial set */
+ writel((readl(&elm_cfg->irqenable) | (0x1 << poly)),
+ &elm_cfg->irqenable);
+ /* set continuous mode for the syndrome polynomial set */
+ writel((readl(&elm_cfg->page_ctrl) & ~(0x1 << poly)),
+ &elm_cfg->page_ctrl);
+
+ return 0;
+}
+
+/**
+ * elm_reset - Do a soft reset of ELM
+ *
+ * Perform a soft reset of ELM and return after reset is done.
+ */
+void elm_reset(void)
+{
+ /* initiate reset */
+ writel((readl(&elm_cfg->sysconfig) | ELM_SYSCONFIG_SOFTRESET),
+ &elm_cfg->sysconfig);
+
+ /* wait for reset complete and normal operation */
+ while ((readl(&elm_cfg->sysstatus) & ELM_SYSSTATUS_RESETDONE) !=
+ ELM_SYSSTATUS_RESETDONE)
+ ;
+}
+
+/**
+ * elm_init - Initialize ELM module
+ *
+ * Initialize ELM support. Currently it does only base address init
+ * and ELM reset.
+ */
+void elm_init(void)
+{
+ elm_cfg = (struct elm *)ELM_BASE;
+ elm_reset();
+}
--- /dev/null
+/*
+ * (C) Copyright 2010-2011 Texas Instruments, <www.ti.com>
+ * Mansoor Ahamed <mansoor.ahamed@ti.com>
+ *
+ * Derived from work done by Rohit Choraria <rohitkc@ti.com> for omap3
+ *
+ * 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
+ */
+#ifndef __ASM_ARCH_ELM_H
+#define __ASM_ARCH_ELM_H
+/*
+ * ELM Module Registers
+ */
+
+/* ELM registers bit fields */
+#define ELM_SYSCONFIG_SOFTRESET_MASK (0x2)
+#define ELM_SYSCONFIG_SOFTRESET (0x2)
+#define ELM_SYSSTATUS_RESETDONE_MASK (0x1)
+#define ELM_SYSSTATUS_RESETDONE (0x1)
+#define ELM_LOCATION_CONFIG_ECC_BCH_LEVEL_MASK (0x3)
+#define ELM_LOCATION_CONFIG_ECC_SIZE_MASK (0x7FF0000)
+#define ELM_LOCATION_CONFIG_ECC_SIZE_POS (16)
+#define ELM_SYNDROME_FRAGMENT_6_SYNDROME_VALID (0x00010000)
+#define ELM_LOCATION_STATUS_ECC_CORRECTABLE_MASK (0x100)
+#define ELM_LOCATION_STATUS_ECC_NB_ERRORS_MASK (0x1F)
+
+#ifndef __ASSEMBLY__
+
+enum bch_level {
+ BCH_4_BIT = 0,
+ BCH_8_BIT,
+ BCH_16_BIT
+};
+
+
+/* BCH syndrome registers */
+struct syndrome {
+ u32 syndrome_fragment_x[7]; /* 0x400, 0x404.... 0x418 */
+ u8 res1[36]; /* 0x41c */
+};
+
+/* BCH error status & location register */
+struct location {
+ u32 location_status; /* 0x800 */
+ u8 res1[124]; /* 0x804 */
+ u32 error_location_x[16]; /* 0x880.... */
+ u8 res2[64]; /* 0x8c0 */
+};
+
+/* BCH ELM register map - do not try to allocate memmory for this structure.
+ * We have used plenty of reserved variables to fill the slots in the ELM
+ * register memory map.
+ * Directly initialize the struct pointer to ELM base address.
+ */
+struct elm {
+ u32 rev; /* 0x000 */
+ u8 res1[12]; /* 0x004 */
+ u32 sysconfig; /* 0x010 */
+ u32 sysstatus; /* 0x014 */
+ u32 irqstatus; /* 0x018 */
+ u32 irqenable; /* 0x01c */
+ u32 location_config; /* 0x020 */
+ u8 res2[92]; /* 0x024 */
+ u32 page_ctrl; /* 0x080 */
+ u8 res3[892]; /* 0x084 */
+ struct syndrome syndrome_fragments[8]; /* 0x400 */
+ u8 res4[512]; /* 0x600 */
+ struct location error_location[8]; /* 0x800 */
+};
+
+int elm_check_error(u8 *syndrome, u32 nibbles, u32 *error_count,
+ u32 *error_locations);
+int elm_config(enum bch_level level);
+void elm_reset(void);
+void elm_init(void);
+#endif /* __ASSEMBLY__ */
+#endif /* __ASM_ARCH_ELM_H */
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