diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/ddr/altera/sdram.c | 35 |
1 files changed, 12 insertions, 23 deletions
diff --git a/drivers/ddr/altera/sdram.c b/drivers/ddr/altera/sdram.c index b540c788edb..45ae690edd1 100644 --- a/drivers/ddr/altera/sdram.c +++ b/drivers/ddr/altera/sdram.c @@ -451,14 +451,11 @@ int sdram_mmr_init_full(unsigned int sdr_phy_reg) return status; } -/* - * To calculate SDRAM device size based on SDRAM controller parameters. - * Size is specified in bytes. +/** + * sdram_calculate_size() - Calculate SDRAM size * - * NOTE: - * This function is compiled and linked into the preloader and - * Uboot (there may be others). So if this function changes, the Preloader - * and UBoot must be updated simultaneously. + * Calculate SDRAM device size based on SDRAM controller parameters. + * Size is specified in bytes. */ unsigned long sdram_calculate_size(void) { @@ -476,23 +473,17 @@ unsigned long sdram_calculate_size(void) col = (temp & SDR_CTRLGRP_DRAMADDRW_COLBITS_MASK) >> SDR_CTRLGRP_DRAMADDRW_COLBITS_LSB; - /* SDRAM Failure When Accessing Non-Existent Memory + /* + * SDRAM Failure When Accessing Non-Existent Memory * Use ROWBITS from Quartus/QSys to calculate SDRAM size * since the FB specifies we modify ROWBITs to work around SDRAM * controller issue. - * - * If the stored handoff value for rows is 0, it probably means - * the preloader is older than UBoot. Use the - * #define from the SOCEDS Tools per Crucible review - * uboot-socfpga-204. Note that this is not a supported - * configuration and is not tested. The customer - * should be using preloader and uboot built from the - * same tag. */ row = readl(&sysmgr_regs->iswgrp_handoff[4]); if (row == 0) row = rowbits; - /* If the stored handoff value for rows is greater than + /* + * If the stored handoff value for rows is greater than * the field width in the sdr.dramaddrw register then * something is very wrong. Revert to using the the #define * value handed off by the SOCEDS tool chain instead of @@ -504,18 +495,16 @@ unsigned long sdram_calculate_size(void) bank = (temp & SDR_CTRLGRP_DRAMADDRW_BANKBITS_MASK) >> SDR_CTRLGRP_DRAMADDRW_BANKBITS_LSB; - /* SDRAM Failure When Accessing Non-Existent Memory + /* + * SDRAM Failure When Accessing Non-Existent Memory * Use CSBITs from Quartus/QSys to calculate SDRAM size * since the FB specifies we modify CSBITs to work around SDRAM * controller issue. */ - cs = (temp & SDR_CTRLGRP_DRAMADDRW_CSBITS_MASK) >> - SDR_CTRLGRP_DRAMADDRW_CSBITS_LSB; - cs += 1; - cs = csbits; width = readl(&sdr_ctrl->dram_if_width); + /* ECC would not be calculated as its not addressible */ if (width == SDRAM_WIDTH_32BIT_WITH_ECC) width = 32; @@ -526,7 +515,7 @@ unsigned long sdram_calculate_size(void) temp = 1 << (row + bank + col); temp = temp * cs * (width / 8); - debug("sdram_calculate_memory returns %ld\n", temp); + debug("%s returns %ld\n", __func__, temp); return temp; } |