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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2012 Samsung Electronics
*
* 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; version 2 of the License.
*
* 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.
*/
/* Mem setup common file for different types of DDR present on SMDK5420 boards.
*/
#include <device/mmio.h>
#include <delay.h>
#include <soc/clk.h>
#include <soc/dmc.h>
#include <soc/setup.h>
#define ZQ_INIT_TIMEOUT 10000
int dmc_config_zq(struct mem_timings *mem,
struct exynos5_phy_control *phy0_ctrl,
struct exynos5_phy_control *phy1_ctrl)
{
unsigned long val = 0;
int i;
/*
* ZQ Calibration:
* Select Driver Strength,
* long calibration for manual calibration
*/
val = PHY_CON16_RESET_VAL;
val |= mem->zq_mode_dds << PHY_CON16_ZQ_MODE_DDS_SHIFT;
val |= mem->zq_mode_term << PHY_CON16_ZQ_MODE_TERM_SHIFT;
val |= ZQ_CLK_DIV_EN;
write32(&phy0_ctrl->phy_con16, val);
write32(&phy1_ctrl->phy_con16, val);
/* Disable termination */
if (mem->zq_mode_noterm)
val |= PHY_CON16_ZQ_MODE_NOTERM_MASK;
write32(&phy0_ctrl->phy_con16, val);
write32(&phy1_ctrl->phy_con16, val);
/* ZQ_MANUAL_START: Enable */
val |= ZQ_MANUAL_STR;
write32(&phy0_ctrl->phy_con16, val);
write32(&phy1_ctrl->phy_con16, val);
/* ZQ_MANUAL_START: Disable */
val &= ~ZQ_MANUAL_STR;
/*
* Since we are manually calibrating the ZQ values,
* we are looping for the ZQ_init to complete.
*/
i = ZQ_INIT_TIMEOUT;
while ((read32(&phy0_ctrl->phy_con17) & ZQ_DONE) != ZQ_DONE && i > 0) {
udelay(1);
i--;
}
if (!i)
return -1;
write32(&phy0_ctrl->phy_con16, val);
i = ZQ_INIT_TIMEOUT;
while ((read32(&phy1_ctrl->phy_con17) & ZQ_DONE) != ZQ_DONE && i > 0) {
udelay(1);
i--;
}
if (!i)
return -1;
write32(&phy1_ctrl->phy_con16, val);
return 0;
}
void update_reset_dll(struct exynos5_dmc *dmc, enum ddr_mode mode)
{
unsigned long val;
if (mode == DDR_MODE_DDR3) {
val = MEM_TERM_EN | PHY_TERM_EN | DMC_CTRL_SHGATE;
write32(&dmc->phycontrol0, val);
}
/* Update DLL Information: Force DLL Resynchronization */
val = read32(&dmc->phycontrol0);
val |= FP_RSYNC;
write32(&dmc->phycontrol0, val);
/* Reset Force DLL Resynchronization */
val = read32(&dmc->phycontrol0);
val &= ~FP_RSYNC;
write32(&dmc->phycontrol0, val);
}
void dmc_config_mrs(struct mem_timings *mem, struct exynos5_dmc *dmc)
{
int channel, chip;
for (channel = 0; channel < mem->dmc_channels; channel++) {
unsigned long mask;
mask = channel << DIRECT_CMD_CHANNEL_SHIFT;
for (chip = 0; chip < mem->chips_to_configure; chip++) {
int i;
mask |= chip << DIRECT_CMD_CHIP_SHIFT;
/* Sending NOP command */
write32(&dmc->directcmd, DIRECT_CMD_NOP | mask);
/*
* TODO(alim.akhtar@samsung.com): Do we need these
* delays? This one and the next were not there for
* DDR3.
*/
udelay(100);
/* Sending EMRS/MRS commands */
for (i = 0; i < MEM_TIMINGS_MSR_COUNT; i++) {
write32(&dmc->directcmd,
mem->direct_cmd_msr[i] | mask);
udelay(100);
}
if (mem->send_zq_init) {
/* Sending ZQINIT command */
write32(&dmc->directcmd,
DIRECT_CMD_ZQINIT | mask);
/*
* FIXME: This was originally sdelay(10000)
* in the imported u-boot code. That may have
* been meant to be sdelay(0x10000) since that
* was used elsewhere in this function. Either
* way seems to work, though.
*/
udelay(12);
}
}
}
}
void dmc_config_prech(struct mem_timings *mem, struct exynos5_dmc *dmc)
{
int channel, chip;
for (channel = 0; channel < mem->dmc_channels; channel++) {
unsigned long mask;
mask = channel << DIRECT_CMD_CHANNEL_SHIFT;
for (chip = 0; chip < mem->chips_per_channel; chip++) {
mask |= chip << DIRECT_CMD_CHIP_SHIFT;
/* PALL (all banks precharge) CMD */
write32(&dmc->directcmd, DIRECT_CMD_PALL | mask);
udelay(100);
}
}
}
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