diff options
Diffstat (limited to 'drivers/ddr/imx/imx8m/lpddr4_init.c')
| -rw-r--r-- | drivers/ddr/imx/imx8m/lpddr4_init.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/drivers/ddr/imx/imx8m/lpddr4_init.c b/drivers/ddr/imx/imx8m/lpddr4_init.c new file mode 100644 index 0000000000..a4bc1de8eb --- /dev/null +++ b/drivers/ddr/imx/imx8m/lpddr4_init.c @@ -0,0 +1,188 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* +* Copyright 2018 NXP +* +*/ + +#include <common.h> +#include <errno.h> +#include <asm/io.h> +#include <asm/arch/ddr.h> +#include <asm/arch/clock.h> +#include <asm/arch/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; + + debug("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(MHZ(750)); + + /* + * 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"); + ddr_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)); + + debug("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); + debug("DDRINFO: ddrmix config done\n"); + + /* save the dram timing config into memory */ + dram_config_save(dram_timing, CONFIG_SAVED_DRAM_TIMING_BASE); +} |