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/*
* Copyright 2018 NXP
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <errno.h>
#include <asm/io.h>
#include <asm/arch/ddr_memory_map.h>
#include <asm/arch/clock.h>
#include <asm/arch/imx8m_ddr.h>
#include <asm/arch/lpddr4_define.h>
#include <asm/arch/sys_proto.h>
void lpddr4_cfg_umctl2(struct dram_cfg_param *ddrc_cfg, int num)
{
int i = 0;
for (i = 0; i < num; i++) {
reg32_write(ddrc_cfg->reg, ddrc_cfg->val);
ddrc_cfg++;
}
}
void ddr_init(struct dram_timing_info *dram_timing)
{
unsigned int tmp;
printf("DDRINFO: start lpddr4 ddr init\n");
/* step 1: reset */
if (is_imx8mq()) {
reg32_write(SRC_DDRC_RCR_ADDR + 0x04, 0x8F00000F);
reg32_write(SRC_DDRC_RCR_ADDR, 0x8F00000F);
reg32_write(SRC_DDRC_RCR_ADDR + 0x04, 0x8F000000);
} else {
reg32_write(SRC_DDRC_RCR_ADDR, 0x8F00001F);
reg32_write(SRC_DDRC_RCR_ADDR, 0x8F00000F);
}
mdelay(100);
debug("DDRINFO: reset done\n");
/* change the clock source of dram_apb_clk_root: source 4 800MHz /4 = 200MHz */
clock_set_target_val(DRAM_APB_CLK_ROOT, CLK_ROOT_ON | CLK_ROOT_SOURCE_SEL(4) |
CLK_ROOT_PRE_DIV(CLK_ROOT_PRE_DIV4));
/* disable iso */
reg32_write(0x303A00EC, 0x0000ffff); /* PGC_CPU_MAPPING */
reg32setbit(0x303A00F8, 5); /* PU_PGC_SW_PUP_REQ */
debug("DDRINFO: cfg clk\n");
dram_pll_init(DRAM_PLL_OUT_750M);
/*
* release [0]ddr1_preset_n, [1]ddr1_core_reset_n,
* [2]ddr1_phy_reset, [3]ddr1_phy_pwrokin_n
*/
reg32_write(SRC_DDRC_RCR_ADDR, 0x8F000006);
/*step2 Configure uMCTL2's registers */
debug("DDRINFO: ddrc config start\n");
lpddr4_cfg_umctl2(dram_timing->ddrc_cfg, dram_timing->ddrc_cfg_num);
debug("DDRINFO: ddrc config done\n");
/*
* step3 de-assert all reset
* RESET: <core_ddrc_rstn> DEASSERTED
* RESET: <aresetn> for Port 0 DEASSERT(0)ED
*/
reg32_write(SRC_DDRC_RCR_ADDR, 0x8F000004);
reg32_write(SRC_DDRC_RCR_ADDR, 0x8F000000);
reg32_write(DDRC_DBG1(0), 0x00000000);
/* step4 */
/* [0]dis_auto_refresh=1 */
reg32_write(DDRC_RFSHCTL3(0), 0x00000011);
/* [8]--1: lpddr4_sr allowed; [5]--1: software entry to SR */
reg32_write(DDRC_PWRCTL(0), 0x000000a8);
do {
tmp = reg32_read(DDRC_STAT(0));
} while ((tmp & 0x33f) != 0x223);
reg32_write(DDRC_DDR_SS_GPR0, 0x01); /* LPDDR4 mode */
/* step5 */
reg32_write(DDRC_SWCTL(0), 0x00000000);
/* step6 */
tmp = reg32_read(DDRC_MSTR2(0));
if (tmp == 0x2) {
reg32_write(DDRC_DFIMISC(0), 0x00000210);
} else if (tmp == 0x1) {
reg32_write(DDRC_DFIMISC(0), 0x00000110);
} else {
reg32_write(DDRC_DFIMISC(0), 0x00000010);
}
/* step7 [0]--1: disable quasi-dynamic programming */
reg32_write(DDRC_SWCTL(0), 0x00000001);
/* step8 Configure LPDDR4 PHY's registers */
debug("DDRINFO:ddrphy config start\n");
lpddr4_cfg_phy(dram_timing);
debug("DDRINFO: ddrphy config done\n");
/*
* step14 CalBusy.0 =1, indicates the calibrator is actively
* calibrating. Wait Calibrating done.
*/
do {
tmp = reg32_read(DDRPHY_CalBusy(0));
} while ((tmp & 0x1));
printf("DDRINFO:ddrphy calibration done\n");
/* step15 [0]--0: to enable quasi-dynamic programming */
reg32_write(DDRC_SWCTL(0), 0x00000000);
/* step16 */
tmp = reg32_read(DDRC_MSTR2(0));
if (tmp == 0x2) {
reg32_write(DDRC_DFIMISC(0), 0x00000230);
} else if (tmp == 0x1) {
reg32_write(DDRC_DFIMISC(0), 0x00000130);
} else {
reg32_write(DDRC_DFIMISC(0), 0x00000030);
}
/* step17 [0]--1: disable quasi-dynamic programming */
reg32_write(DDRC_SWCTL(0), 0x00000001);
/* step18 wait DFISTAT.dfi_init_complete to 1 */
do {
tmp = reg32_read(DDRC_DFISTAT(0));
} while ((tmp & 0x1) == 0x0);
/* step19 */
reg32_write(DDRC_SWCTL(0), 0x00000000);
/* step20~22 */
tmp = reg32_read(DDRC_MSTR2(0));
if (tmp == 0x2) {
reg32_write(DDRC_DFIMISC(0), 0x00000210);
/* set DFIMISC.dfi_init_complete_en again */
reg32_write(DDRC_DFIMISC(0), 0x00000211);
} else if (tmp == 0x1) {
reg32_write(DDRC_DFIMISC(0), 0x00000110);
/* set DFIMISC.dfi_init_complete_en again */
reg32_write(DDRC_DFIMISC(0), 0x00000111);
} else {
/* clear DFIMISC.dfi_init_complete_en */
reg32_write(DDRC_DFIMISC(0), 0x00000010);
/* set DFIMISC.dfi_init_complete_en again */
reg32_write(DDRC_DFIMISC(0), 0x00000011);
}
/* step23 [5]selfref_sw=0; */
reg32_write(DDRC_PWRCTL(0), 0x00000008);
/* step24 sw_done=1 */
reg32_write(DDRC_SWCTL(0), 0x00000001);
/* step25 wait SWSTAT.sw_done_ack to 1 */
do {
tmp = reg32_read(DDRC_SWSTAT(0));
} while ((tmp & 0x1) == 0x0);
#ifdef DFI_BUG_WR
reg32_write(DDRC_DFIPHYMSTR(0), 0x00000001);
#endif
/* wait STAT.operating_mode([1:0] for ddr3) to normal state */
do {
tmp = reg32_read(DDRC_STAT(0));
} while ((tmp & 0x3) != 0x1);
/* step26 */
reg32_write(DDRC_RFSHCTL3(0), 0x00000010);
/* enable port 0 */
reg32_write(DDRC_PCTRL_0(0), 0x00000001);
printf("DDRINFO: ddrmix config done\n");
/* save the dram timing config into memory */
dram_config_save(dram_timing, CONFIG_SAVED_DRAM_TIMING_BASE);
}