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authorMarek Vasut <marex@denx.de>2015-08-01 21:47:16 +0200
committerMarek Vasut <marex@denx.de>2015-08-08 14:14:27 +0200
commitf97606f237f3dc6b39bf4f7830a20a14255c72e1 (patch)
treef4249c90c6e639ee8bc402e852f74363506231d4 /drivers/ddr/altera/sdram.c
parentbb056d9c07fd08a743b262b82f26be8fbe710955 (diff)
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ddr: altera: sdram: Clean up sdram_calculate_size() part 2
Clean up coding style, mostly clean up comments, add kerneldoc. Also, zap assignment of the "cs" variable, which is outright dead code, so just remove it. Signed-off-by: Marek Vasut <marex@denx.de>
Diffstat (limited to 'drivers/ddr/altera/sdram.c')
-rw-r--r--drivers/ddr/altera/sdram.c35
1 files changed, 12 insertions, 23 deletions
diff --git a/drivers/ddr/altera/sdram.c b/drivers/ddr/altera/sdram.c
index b540c78..45ae690 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;
}