* Copyright (c) 2008 Nuovation System Designs, LLC
* Grant Erickson <gerickson@nuovations.com>
*
- * (C) Copyright 2005-2007
+ * (C) Copyright 2005-2009
* Stefan Roese, DENX Software Engineering, sr@denx.de.
*
* (C) Copyright 2002
#include <ppc_defs.h>
#include <asm/processor.h>
#include <asm/io.h>
+#include <asm/mmu.h>
+#include <asm/cache.h>
#include "ecc.h"
#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)
/*
- * void ecc_init()
- *
- * Description:
- * This routine initializes a range of DRAM ECC memory with known
- * data and enables ECC checking.
- *
- * TO DO:
- * - Improve performance by utilizing cache.
- * - Further generalize to make usable by other 4xx variants (e.g.
- * 440EPx, et al).
- *
- * Input(s):
- * start - A pointer to the start of memory covered by ECC requiring
- * initialization.
- * size - The size, in bytes, of the memory covered by ECC requiring
- * initialization.
- *
- * Output(s):
- * start - A pointer to the start of memory covered by ECC with
- * CFG_ECC_PATTERN written to all locations and ECC data
- * primed.
- *
- * Returns:
- * N/A
+ * Currently only 405EX uses 16bit data bus width as an alternative
+ * option to 32bit data width (SDRAM0_MCOPT1_WDTH)
*/
-void ecc_init(unsigned long * const start, unsigned long size)
+#define SDRAM_DATA_ALT_WIDTH 2
+#else
+#define SDRAM_DATA_ALT_WIDTH 8
+#endif
+
+static void wait_ddr_idle(void)
{
- const unsigned long pattern = CFG_ECC_PATTERN;
- unsigned long * const end = (unsigned long * const)((long)start + size);
- unsigned long * current = start;
+ u32 val;
+
+ do {
+ mfsdram(SDRAM_MCSTAT, val);
+ } while ((val & SDRAM_MCSTAT_IDLE_MASK) == SDRAM_MCSTAT_IDLE_NOT);
+}
+
+static void program_ecc_addr(unsigned long start_address,
+ unsigned long num_bytes,
+ unsigned long tlb_word2_i_value)
+{
+ unsigned long current_address;
+ unsigned long end_address;
+ unsigned long address_increment;
unsigned long mcopt1;
- long increment;
+ char str[] = "ECC generation -";
+ char slash[] = "\\|/-\\|/-";
+ int loop = 0;
+ int loopi = 0;
- if (start >= end)
- return;
+ current_address = start_address;
+ mfsdram(SDRAM_MCOPT1, mcopt1);
+ if ((mcopt1 & SDRAM_MCOPT1_MCHK_MASK) != SDRAM_MCOPT1_MCHK_NON) {
+ mtsdram(SDRAM_MCOPT1,
+ (mcopt1 & ~SDRAM_MCOPT1_MCHK_MASK) | SDRAM_MCOPT1_MCHK_GEN);
+ sync();
+ eieio();
+ wait_ddr_idle();
+
+ puts(str);
- mfsdram(SDRAM_ECC_CFG, mcopt1);
+#ifdef CONFIG_440
+ if (tlb_word2_i_value == TLB_WORD2_I_ENABLE) {
+#endif
+ /* ECC bit set method for non-cached memory */
+ if ((mcopt1 & SDRAM_MCOPT1_DMWD_MASK) == SDRAM_MCOPT1_DMWD_32)
+ address_increment = 4;
+ else
+ address_increment = SDRAM_DATA_ALT_WIDTH;
+ end_address = current_address + num_bytes;
- /* Enable ECC generation without checking or reporting */
+ while (current_address < end_address) {
+ *((unsigned long *)current_address) = 0;
+ current_address += address_increment;
- mtsdram(SDRAM_ECC_CFG, ((mcopt1 & ~SDRAM_ECC_CFG_MCHK_MASK) |
- SDRAM_ECC_CFG_MCHK_GEN));
+ if ((loop++ % (2 << 20)) == 0) {
+ putc('\b');
+ putc(slash[loopi++ % 8]);
+ }
+ }
+#ifdef CONFIG_440
+ } else {
+ /* ECC bit set method for cached memory */
+ dcbz_area(start_address, num_bytes);
+ /* Write modified dcache lines back to memory */
+ clean_dcache_range(start_address, start_address + num_bytes);
+ }
+#endif /* CONFIG_440 */
- increment = sizeof(u32);
+ blank_string(strlen(str));
-#if defined(CONFIG_440)
+ sync();
+ eieio();
+ wait_ddr_idle();
+
+ /* clear ECC error repoting registers */
+ mtsdram(SDRAM_ECCES, 0xffffffff);
+ mtdcr(0x4c, 0xffffffff);
+
+ mtsdram(SDRAM_MCOPT1,
+ (mcopt1 & ~SDRAM_MCOPT1_MCHK_MASK) | SDRAM_MCOPT1_MCHK_CHK_REP);
+ sync();
+ eieio();
+ wait_ddr_idle();
+ }
+}
+
+#if defined(CONFIG_SDRAM_PPC4xx_IBM_DDR)
+void ecc_init(unsigned long * const start, unsigned long size)
+{
/*
- * Look at the geometry of SDRAM (data width) to determine whether we
- * can skip words when writing.
+ * Init ECC with cache disabled (on PPC's with IBM DDR
+ * controller (non DDR2), not tested with cache enabled yet
*/
+ program_ecc_addr((u32)start, size, TLB_WORD2_I_ENABLE);
+}
+#endif
- if ((mcopt1 & SDRAM_ECC_CFG_DMWD_MASK) != SDRAM_ECC_CFG_DMWD_32)
- increment = sizeof(u64);
-#endif /* defined(CONFIG_440) */
+#if defined(CONFIG_SDRAM_PPC4xx_IBM_DDR2)
+void do_program_ecc(unsigned long tlb_word2_i_value)
+{
+ unsigned long mcopt1;
+ unsigned long mcopt2;
+ unsigned long mcstat;
+ phys_size_t memsize = sdram_memsize();
- while (current < end) {
- *current = pattern;
- current = (unsigned long *)((long)current + increment);
+ if (memsize > CONFIG_MAX_MEM_MAPPED) {
+ printf("\nWarning: Can't enable ECC on systems with more than 2GB of SDRAM!\n");
+ return;
}
- /* Wait until the writes are finished. */
+ mfsdram(SDRAM_MCOPT1, mcopt1);
+ mfsdram(SDRAM_MCOPT2, mcopt2);
- sync();
+ if ((mcopt1 & SDRAM_MCOPT1_MCHK_MASK) != SDRAM_MCOPT1_MCHK_NON) {
+ /* DDR controller must be enabled and not in self-refresh. */
+ mfsdram(SDRAM_MCSTAT, mcstat);
+ if (((mcopt2 & SDRAM_MCOPT2_DCEN_MASK) == SDRAM_MCOPT2_DCEN_ENABLE)
+ && ((mcopt2 & SDRAM_MCOPT2_SREN_MASK) == SDRAM_MCOPT2_SREN_EXIT)
+ && ((mcstat & (SDRAM_MCSTAT_MIC_MASK | SDRAM_MCSTAT_SRMS_MASK))
+ == (SDRAM_MCSTAT_MIC_COMP | SDRAM_MCSTAT_SRMS_NOT_SF))) {
- /* Enable ECC generation with checking and no reporting */
-
- mtsdram(SDRAM_ECC_CFG, ((mcopt1 & ~SDRAM_ECC_CFG_MCHK_MASK) |
- SDRAM_ECC_CFG_MCHK_CHK));
+ program_ecc_addr(0, memsize, tlb_word2_i_value);
+ }
+ }
}
+#endif
+
#endif /* defined(CONFIG_DDR_ECC) || defined(CONFIG_SDRAM_ECC) */
#endif /* defined(CONFIG_SDRAM_PPC4xx_IBM_DDR)... */
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