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ddr: altera: sdram: Clean up set_sdr_addr_rw()

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Get rid of the constant clrsetbits_le32(), instead prepare the whole
content of the register once and write it at the end of the function.

Signed-off-by: Marek Vasut <marex@denx.de>
This commit is contained in:
Marek Vasut 2015-08-01 19:50:56 +02:00
parent 60bd0df018
commit 0ef8830037
1 changed files with 10 additions and 20 deletions
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30
drivers/ddr/altera/sdram.c
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@ -371,34 +371,24 @@ static void set_sdr_dram_timing(void)
static void set_sdr_addr_rw(void)
{
int rows;
debug("Configuring DRAMADDRW\n");
clrsetbits_le32(&sdr_ctrl->dram_addrw, SDR_CTRLGRP_DRAMADDRW_COLBITS_MASK,
CONFIG_HPS_SDR_CTRLCFG_DRAMADDRW_COLBITS <<
SDR_CTRLGRP_DRAMADDRW_COLBITS_LSB);
/*
* SDRAM Failure When Accessing Non-Existent Memory
* Update Preloader to artificially increase the number of rows so
* that the memory thinks it has 4GB of RAM.
*/
rows = get_errata_rows();
clrsetbits_le32(&sdr_ctrl->dram_addrw, SDR_CTRLGRP_DRAMADDRW_ROWBITS_MASK,
rows << SDR_CTRLGRP_DRAMADDRW_ROWBITS_LSB);
clrsetbits_le32(&sdr_ctrl->dram_addrw, SDR_CTRLGRP_DRAMADDRW_BANKBITS_MASK,
CONFIG_HPS_SDR_CTRLCFG_DRAMADDRW_BANKBITS <<
SDR_CTRLGRP_DRAMADDRW_BANKBITS_LSB);
/* SDRAM Failure When Accessing Non-Existent Memory
* Set SDR_CTRLGRP_DRAMADDRW_CSBITS_LSB to
* log2(number of chip select bits). Since there's only
* 1 or 2 chip selects, log2(1) => 0, and log2(2) => 1,
* which is the same as "chip selects" - 1.
*/
clrsetbits_le32(&sdr_ctrl->dram_addrw, SDR_CTRLGRP_DRAMADDRW_CSBITS_MASK,
(CONFIG_HPS_SDR_CTRLCFG_DRAMADDRW_CSBITS - 1) <<
const int rows = get_errata_rows();
const u32 dram_addrw =
(CONFIG_HPS_SDR_CTRLCFG_DRAMADDRW_COLBITS <<
SDR_CTRLGRP_DRAMADDRW_COLBITS_LSB) |
(rows << SDR_CTRLGRP_DRAMADDRW_ROWBITS_LSB) |
(CONFIG_HPS_SDR_CTRLCFG_DRAMADDRW_BANKBITS <<
SDR_CTRLGRP_DRAMADDRW_BANKBITS_LSB) |
((CONFIG_HPS_SDR_CTRLCFG_DRAMADDRW_CSBITS - 1) <<
SDR_CTRLGRP_DRAMADDRW_CSBITS_LSB);
debug("Configuring DRAMADDRW\n");
writel(dram_addrw, &sdr_ctrl->dram_addrw);
}
static void set_sdr_static_cfg(void)