/* * Copyright (C) 2018-2022, STMicroelectronics - All Rights Reserved * * SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define DDRCTL_REG(x, y) \ { \ .name = #x, \ .offset = offsetof(struct stm32mp_ddrctl, x), \ .par_offset = offsetof(struct y, x) \ } #define DDRPHY_REG(x, y) \ { \ .name = #x, \ .offset = offsetof(struct stm32mp_ddrphy, x), \ .par_offset = offsetof(struct y, x) \ } /* * PARAMETERS: value get from device tree : * size / order need to be aligned with binding * modification NOT ALLOWED !!! */ #define DDRCTL_REG_REG_SIZE 25 /* st,ctl-reg */ #define DDRCTL_REG_TIMING_SIZE 12 /* st,ctl-timing */ #define DDRCTL_REG_MAP_SIZE 9 /* st,ctl-map */ #if STM32MP_DDR_DUAL_AXI_PORT #define DDRCTL_REG_PERF_SIZE 17 /* st,ctl-perf */ #else #define DDRCTL_REG_PERF_SIZE 11 /* st,ctl-perf */ #endif #if STM32MP_DDR_32BIT_INTERFACE #define DDRPHY_REG_REG_SIZE 11 /* st,phy-reg */ #else #define DDRPHY_REG_REG_SIZE 9 /* st,phy-reg */ #endif #define DDRPHY_REG_TIMING_SIZE 10 /* st,phy-timing */ #define DDRCTL_REG_REG(x) DDRCTL_REG(x, stm32mp1_ddrctrl_reg) static const struct stm32mp_ddr_reg_desc ddr_reg[DDRCTL_REG_REG_SIZE] = { DDRCTL_REG_REG(mstr), DDRCTL_REG_REG(mrctrl0), DDRCTL_REG_REG(mrctrl1), DDRCTL_REG_REG(derateen), DDRCTL_REG_REG(derateint), DDRCTL_REG_REG(pwrctl), DDRCTL_REG_REG(pwrtmg), DDRCTL_REG_REG(hwlpctl), DDRCTL_REG_REG(rfshctl0), DDRCTL_REG_REG(rfshctl3), DDRCTL_REG_REG(crcparctl0), DDRCTL_REG_REG(zqctl0), DDRCTL_REG_REG(dfitmg0), DDRCTL_REG_REG(dfitmg1), DDRCTL_REG_REG(dfilpcfg0), DDRCTL_REG_REG(dfiupd0), DDRCTL_REG_REG(dfiupd1), DDRCTL_REG_REG(dfiupd2), DDRCTL_REG_REG(dfiphymstr), DDRCTL_REG_REG(odtmap), DDRCTL_REG_REG(dbg0), DDRCTL_REG_REG(dbg1), DDRCTL_REG_REG(dbgcmd), DDRCTL_REG_REG(poisoncfg), DDRCTL_REG_REG(pccfg), }; #define DDRCTL_REG_TIMING(x) DDRCTL_REG(x, stm32mp1_ddrctrl_timing) static const struct stm32mp_ddr_reg_desc ddr_timing[DDRCTL_REG_TIMING_SIZE] = { DDRCTL_REG_TIMING(rfshtmg), DDRCTL_REG_TIMING(dramtmg0), DDRCTL_REG_TIMING(dramtmg1), DDRCTL_REG_TIMING(dramtmg2), DDRCTL_REG_TIMING(dramtmg3), DDRCTL_REG_TIMING(dramtmg4), DDRCTL_REG_TIMING(dramtmg5), DDRCTL_REG_TIMING(dramtmg6), DDRCTL_REG_TIMING(dramtmg7), DDRCTL_REG_TIMING(dramtmg8), DDRCTL_REG_TIMING(dramtmg14), DDRCTL_REG_TIMING(odtcfg), }; #define DDRCTL_REG_MAP(x) DDRCTL_REG(x, stm32mp1_ddrctrl_map) static const struct stm32mp_ddr_reg_desc ddr_map[DDRCTL_REG_MAP_SIZE] = { DDRCTL_REG_MAP(addrmap1), DDRCTL_REG_MAP(addrmap2), DDRCTL_REG_MAP(addrmap3), DDRCTL_REG_MAP(addrmap4), DDRCTL_REG_MAP(addrmap5), DDRCTL_REG_MAP(addrmap6), DDRCTL_REG_MAP(addrmap9), DDRCTL_REG_MAP(addrmap10), DDRCTL_REG_MAP(addrmap11), }; #define DDRCTL_REG_PERF(x) DDRCTL_REG(x, stm32mp1_ddrctrl_perf) static const struct stm32mp_ddr_reg_desc ddr_perf[DDRCTL_REG_PERF_SIZE] = { DDRCTL_REG_PERF(sched), DDRCTL_REG_PERF(sched1), DDRCTL_REG_PERF(perfhpr1), DDRCTL_REG_PERF(perflpr1), DDRCTL_REG_PERF(perfwr1), DDRCTL_REG_PERF(pcfgr_0), DDRCTL_REG_PERF(pcfgw_0), DDRCTL_REG_PERF(pcfgqos0_0), DDRCTL_REG_PERF(pcfgqos1_0), DDRCTL_REG_PERF(pcfgwqos0_0), DDRCTL_REG_PERF(pcfgwqos1_0), #if STM32MP_DDR_DUAL_AXI_PORT DDRCTL_REG_PERF(pcfgr_1), DDRCTL_REG_PERF(pcfgw_1), DDRCTL_REG_PERF(pcfgqos0_1), DDRCTL_REG_PERF(pcfgqos1_1), DDRCTL_REG_PERF(pcfgwqos0_1), DDRCTL_REG_PERF(pcfgwqos1_1), #endif }; #define DDRPHY_REG_REG(x) DDRPHY_REG(x, stm32mp1_ddrphy_reg) static const struct stm32mp_ddr_reg_desc ddrphy_reg[DDRPHY_REG_REG_SIZE] = { DDRPHY_REG_REG(pgcr), DDRPHY_REG_REG(aciocr), DDRPHY_REG_REG(dxccr), DDRPHY_REG_REG(dsgcr), DDRPHY_REG_REG(dcr), DDRPHY_REG_REG(odtcr), DDRPHY_REG_REG(zq0cr1), DDRPHY_REG_REG(dx0gcr), DDRPHY_REG_REG(dx1gcr), #if STM32MP_DDR_32BIT_INTERFACE DDRPHY_REG_REG(dx2gcr), DDRPHY_REG_REG(dx3gcr), #endif }; #define DDRPHY_REG_TIMING(x) DDRPHY_REG(x, stm32mp1_ddrphy_timing) static const struct stm32mp_ddr_reg_desc ddrphy_timing[DDRPHY_REG_TIMING_SIZE] = { DDRPHY_REG_TIMING(ptr0), DDRPHY_REG_TIMING(ptr1), DDRPHY_REG_TIMING(ptr2), DDRPHY_REG_TIMING(dtpr0), DDRPHY_REG_TIMING(dtpr1), DDRPHY_REG_TIMING(dtpr2), DDRPHY_REG_TIMING(mr0), DDRPHY_REG_TIMING(mr1), DDRPHY_REG_TIMING(mr2), DDRPHY_REG_TIMING(mr3), }; /* * REGISTERS ARRAY: used to parse device tree and interactive mode */ static const struct stm32mp_ddr_reg_info ddr_registers[REG_TYPE_NB] = { [REG_REG] = { .name = "static", .desc = ddr_reg, .size = DDRCTL_REG_REG_SIZE, .base = DDR_BASE }, [REG_TIMING] = { .name = "timing", .desc = ddr_timing, .size = DDRCTL_REG_TIMING_SIZE, .base = DDR_BASE }, [REG_PERF] = { .name = "perf", .desc = ddr_perf, .size = DDRCTL_REG_PERF_SIZE, .base = DDR_BASE }, [REG_MAP] = { .name = "map", .desc = ddr_map, .size = DDRCTL_REG_MAP_SIZE, .base = DDR_BASE }, [REGPHY_REG] = { .name = "static", .desc = ddrphy_reg, .size = DDRPHY_REG_REG_SIZE, .base = DDRPHY_BASE }, [REGPHY_TIMING] = { .name = "timing", .desc = ddrphy_timing, .size = DDRPHY_REG_TIMING_SIZE, .base = DDRPHY_BASE }, }; static void stm32mp1_ddrphy_idone_wait(struct stm32mp_ddrphy *phy) { uint32_t pgsr; int error = 0; uint64_t timeout = timeout_init_us(TIMEOUT_US_1S); do { pgsr = mmio_read_32((uintptr_t)&phy->pgsr); VERBOSE(" > [0x%lx] pgsr = 0x%x &\n", (uintptr_t)&phy->pgsr, pgsr); if (timeout_elapsed(timeout)) { panic(); } if ((pgsr & DDRPHYC_PGSR_DTERR) != 0U) { VERBOSE("DQS Gate Trainig Error\n"); error++; } if ((pgsr & DDRPHYC_PGSR_DTIERR) != 0U) { VERBOSE("DQS Gate Trainig Intermittent Error\n"); error++; } if ((pgsr & DDRPHYC_PGSR_DFTERR) != 0U) { VERBOSE("DQS Drift Error\n"); error++; } if ((pgsr & DDRPHYC_PGSR_RVERR) != 0U) { VERBOSE("Read Valid Training Error\n"); error++; } if ((pgsr & DDRPHYC_PGSR_RVEIRR) != 0U) { VERBOSE("Read Valid Training Intermittent Error\n"); error++; } } while (((pgsr & DDRPHYC_PGSR_IDONE) == 0U) && (error == 0)); VERBOSE("\n[0x%lx] pgsr = 0x%x\n", (uintptr_t)&phy->pgsr, pgsr); } static void stm32mp1_ddrphy_init(struct stm32mp_ddrphy *phy, uint32_t pir) { uint32_t pir_init = pir | DDRPHYC_PIR_INIT; mmio_write_32((uintptr_t)&phy->pir, pir_init); VERBOSE("[0x%lx] pir = 0x%x -> 0x%x\n", (uintptr_t)&phy->pir, pir_init, mmio_read_32((uintptr_t)&phy->pir)); /* Need to wait 10 configuration clock before start polling */ udelay(10); /* Wait DRAM initialization and Gate Training Evaluation complete */ stm32mp1_ddrphy_idone_wait(phy); } /* Wait quasi dynamic register update */ static void stm32mp1_wait_operating_mode(struct stm32mp_ddr_priv *priv, uint32_t mode) { uint64_t timeout; uint32_t stat; int break_loop = 0; timeout = timeout_init_us(TIMEOUT_US_1S); for ( ; ; ) { uint32_t operating_mode; uint32_t selref_type; stat = mmio_read_32((uintptr_t)&priv->ctl->stat); operating_mode = stat & DDRCTRL_STAT_OPERATING_MODE_MASK; selref_type = stat & DDRCTRL_STAT_SELFREF_TYPE_MASK; VERBOSE("[0x%lx] stat = 0x%x\n", (uintptr_t)&priv->ctl->stat, stat); if (timeout_elapsed(timeout)) { panic(); } if (mode == DDRCTRL_STAT_OPERATING_MODE_SR) { /* * Self-refresh due to software * => checking also STAT.selfref_type. */ if ((operating_mode == DDRCTRL_STAT_OPERATING_MODE_SR) && (selref_type == DDRCTRL_STAT_SELFREF_TYPE_SR)) { break_loop = 1; } } else if (operating_mode == mode) { break_loop = 1; } else if ((mode == DDRCTRL_STAT_OPERATING_MODE_NORMAL) && (operating_mode == DDRCTRL_STAT_OPERATING_MODE_SR) && (selref_type == DDRCTRL_STAT_SELFREF_TYPE_ASR)) { /* Normal mode: handle also automatic self refresh */ break_loop = 1; } if (break_loop == 1) { break; } } VERBOSE("[0x%lx] stat = 0x%x\n", (uintptr_t)&priv->ctl->stat, stat); } /* Mode Register Writes (MRW or MRS) */ static void stm32mp1_mode_register_write(struct stm32mp_ddr_priv *priv, uint8_t addr, uint32_t data) { uint32_t mrctrl0; VERBOSE("MRS: %d = %x\n", addr, data); /* * 1. Poll MRSTAT.mr_wr_busy until it is '0'. * This checks that there is no outstanding MR transaction. * No write should be performed to MRCTRL0 and MRCTRL1 * if MRSTAT.mr_wr_busy = 1. */ while ((mmio_read_32((uintptr_t)&priv->ctl->mrstat) & DDRCTRL_MRSTAT_MR_WR_BUSY) != 0U) { ; } /* * 2. Write the MRCTRL0.mr_type, MRCTRL0.mr_addr, MRCTRL0.mr_rank * and (for MRWs) MRCTRL1.mr_data to define the MR transaction. */ mrctrl0 = DDRCTRL_MRCTRL0_MR_TYPE_WRITE | DDRCTRL_MRCTRL0_MR_RANK_ALL | (((uint32_t)addr << DDRCTRL_MRCTRL0_MR_ADDR_SHIFT) & DDRCTRL_MRCTRL0_MR_ADDR_MASK); mmio_write_32((uintptr_t)&priv->ctl->mrctrl0, mrctrl0); VERBOSE("[0x%lx] mrctrl0 = 0x%x (0x%x)\n", (uintptr_t)&priv->ctl->mrctrl0, mmio_read_32((uintptr_t)&priv->ctl->mrctrl0), mrctrl0); mmio_write_32((uintptr_t)&priv->ctl->mrctrl1, data); VERBOSE("[0x%lx] mrctrl1 = 0x%x\n", (uintptr_t)&priv->ctl->mrctrl1, mmio_read_32((uintptr_t)&priv->ctl->mrctrl1)); /* * 3. In a separate APB transaction, write the MRCTRL0.mr_wr to 1. This * bit is self-clearing, and triggers the MR transaction. * The uMCTL2 then asserts the MRSTAT.mr_wr_busy while it performs * the MR transaction to SDRAM, and no further access can be * initiated until it is deasserted. */ mrctrl0 |= DDRCTRL_MRCTRL0_MR_WR; mmio_write_32((uintptr_t)&priv->ctl->mrctrl0, mrctrl0); while ((mmio_read_32((uintptr_t)&priv->ctl->mrstat) & DDRCTRL_MRSTAT_MR_WR_BUSY) != 0U) { ; } VERBOSE("[0x%lx] mrctrl0 = 0x%x\n", (uintptr_t)&priv->ctl->mrctrl0, mrctrl0); } /* Switch DDR3 from DLL-on to DLL-off */ static void stm32mp1_ddr3_dll_off(struct stm32mp_ddr_priv *priv) { uint32_t mr1 = mmio_read_32((uintptr_t)&priv->phy->mr1); uint32_t mr2 = mmio_read_32((uintptr_t)&priv->phy->mr2); uint32_t dbgcam; VERBOSE("mr1: 0x%x\n", mr1); VERBOSE("mr2: 0x%x\n", mr2); /* * 1. Set the DBG1.dis_hif = 1. * This prevents further reads/writes being received on the HIF. */ mmio_setbits_32((uintptr_t)&priv->ctl->dbg1, DDRCTRL_DBG1_DIS_HIF); VERBOSE("[0x%lx] dbg1 = 0x%x\n", (uintptr_t)&priv->ctl->dbg1, mmio_read_32((uintptr_t)&priv->ctl->dbg1)); /* * 2. Ensure all commands have been flushed from the uMCTL2 by polling * DBGCAM.wr_data_pipeline_empty = 1, * DBGCAM.rd_data_pipeline_empty = 1, * DBGCAM.dbg_wr_q_depth = 0 , * DBGCAM.dbg_lpr_q_depth = 0, and * DBGCAM.dbg_hpr_q_depth = 0. */ do { dbgcam = mmio_read_32((uintptr_t)&priv->ctl->dbgcam); VERBOSE("[0x%lx] dbgcam = 0x%x\n", (uintptr_t)&priv->ctl->dbgcam, dbgcam); } while ((((dbgcam & DDRCTRL_DBGCAM_DATA_PIPELINE_EMPTY) == DDRCTRL_DBGCAM_DATA_PIPELINE_EMPTY)) && ((dbgcam & DDRCTRL_DBGCAM_DBG_Q_DEPTH) == 0U)); /* * 3. Perform an MRS command (using MRCTRL0 and MRCTRL1 registers) * to disable RTT_NOM: * a. DDR3: Write to MR1[9], MR1[6] and MR1[2] * b. DDR4: Write to MR1[10:8] */ mr1 &= ~(BIT(9) | BIT(6) | BIT(2)); stm32mp1_mode_register_write(priv, 1, mr1); /* * 4. For DDR4 only: Perform an MRS command * (using MRCTRL0 and MRCTRL1 registers) to write to MR5[8:6] * to disable RTT_PARK */ /* * 5. Perform an MRS command (using MRCTRL0 and MRCTRL1 registers) * to write to MR2[10:9], to disable RTT_WR * (and therefore disable dynamic ODT). * This applies for both DDR3 and DDR4. */ mr2 &= ~GENMASK(10, 9); stm32mp1_mode_register_write(priv, 2, mr2); /* * 6. Perform an MRS command (using MRCTRL0 and MRCTRL1 registers) * to disable the DLL. The timing of this MRS is automatically * handled by the uMCTL2. * a. DDR3: Write to MR1[0] * b. DDR4: Write to MR1[0] */ mr1 |= BIT(0); stm32mp1_mode_register_write(priv, 1, mr1); /* * 7. Put the SDRAM into self-refresh mode by setting * PWRCTL.selfref_sw = 1, and polling STAT.operating_mode to ensure * the DDRC has entered self-refresh. */ mmio_setbits_32((uintptr_t)&priv->ctl->pwrctl, DDRCTRL_PWRCTL_SELFREF_SW); VERBOSE("[0x%lx] pwrctl = 0x%x\n", (uintptr_t)&priv->ctl->pwrctl, mmio_read_32((uintptr_t)&priv->ctl->pwrctl)); /* * 8. Wait until STAT.operating_mode[1:0]==11 indicating that the * DWC_ddr_umctl2 core is in self-refresh mode. * Ensure transition to self-refresh was due to software * by checking that STAT.selfref_type[1:0]=2. */ stm32mp1_wait_operating_mode(priv, DDRCTRL_STAT_OPERATING_MODE_SR); /* * 9. Set the MSTR.dll_off_mode = 1. * warning: MSTR.dll_off_mode is a quasi-dynamic type 2 field */ stm32mp_ddr_start_sw_done(priv->ctl); mmio_setbits_32((uintptr_t)&priv->ctl->mstr, DDRCTRL_MSTR_DLL_OFF_MODE); VERBOSE("[0x%lx] mstr = 0x%x\n", (uintptr_t)&priv->ctl->mstr, mmio_read_32((uintptr_t)&priv->ctl->mstr)); stm32mp_ddr_wait_sw_done_ack(priv->ctl); /* 10. Change the clock frequency to the desired value. */ /* * 11. Update any registers which may be required to change for the new * frequency. This includes static and dynamic registers. * This includes both uMCTL2 registers and PHY registers. */ /* Change Bypass Mode Frequency Range */ if (clk_get_rate(DDRPHYC) < 100000000U) { mmio_clrbits_32((uintptr_t)&priv->phy->dllgcr, DDRPHYC_DLLGCR_BPS200); } else { mmio_setbits_32((uintptr_t)&priv->phy->dllgcr, DDRPHYC_DLLGCR_BPS200); } mmio_setbits_32((uintptr_t)&priv->phy->acdllcr, DDRPHYC_ACDLLCR_DLLDIS); mmio_setbits_32((uintptr_t)&priv->phy->dx0dllcr, DDRPHYC_DXNDLLCR_DLLDIS); mmio_setbits_32((uintptr_t)&priv->phy->dx1dllcr, DDRPHYC_DXNDLLCR_DLLDIS); #if STM32MP_DDR_32BIT_INTERFACE mmio_setbits_32((uintptr_t)&priv->phy->dx2dllcr, DDRPHYC_DXNDLLCR_DLLDIS); mmio_setbits_32((uintptr_t)&priv->phy->dx3dllcr, DDRPHYC_DXNDLLCR_DLLDIS); #endif /* 12. Exit the self-refresh state by setting PWRCTL.selfref_sw = 0. */ mmio_clrbits_32((uintptr_t)&priv->ctl->pwrctl, DDRCTRL_PWRCTL_SELFREF_SW); stm32mp1_wait_operating_mode(priv, DDRCTRL_STAT_OPERATING_MODE_NORMAL); /* * 13. If ZQCTL0.dis_srx_zqcl = 0, the uMCTL2 performs a ZQCL command * at this point. */ /* * 14. Perform MRS commands as required to re-program timing registers * in the SDRAM for the new frequency * (in particular, CL, CWL and WR may need to be changed). */ /* 15. Write DBG1.dis_hif = 0 to re-enable reads and writes. */ mmio_clrbits_32((uintptr_t)&priv->ctl->dbg1, DDRCTRL_DBG1_DIS_HIF); VERBOSE("[0x%lx] dbg1 = 0x%x\n", (uintptr_t)&priv->ctl->dbg1, mmio_read_32((uintptr_t)&priv->ctl->dbg1)); } static void stm32mp1_refresh_disable(struct stm32mp_ddrctl *ctl) { stm32mp_ddr_start_sw_done(ctl); /* Quasi-dynamic register update*/ mmio_setbits_32((uintptr_t)&ctl->rfshctl3, DDRCTRL_RFSHCTL3_DIS_AUTO_REFRESH); mmio_clrbits_32((uintptr_t)&ctl->pwrctl, DDRCTRL_PWRCTL_POWERDOWN_EN); mmio_clrbits_32((uintptr_t)&ctl->dfimisc, DDRCTRL_DFIMISC_DFI_INIT_COMPLETE_EN); stm32mp_ddr_wait_sw_done_ack(ctl); } static void stm32mp1_refresh_restore(struct stm32mp_ddrctl *ctl, uint32_t rfshctl3, uint32_t pwrctl) { stm32mp_ddr_start_sw_done(ctl); if ((rfshctl3 & DDRCTRL_RFSHCTL3_DIS_AUTO_REFRESH) == 0U) { mmio_clrbits_32((uintptr_t)&ctl->rfshctl3, DDRCTRL_RFSHCTL3_DIS_AUTO_REFRESH); } if ((pwrctl & DDRCTRL_PWRCTL_POWERDOWN_EN) != 0U) { mmio_setbits_32((uintptr_t)&ctl->pwrctl, DDRCTRL_PWRCTL_POWERDOWN_EN); } mmio_setbits_32((uintptr_t)&ctl->dfimisc, DDRCTRL_DFIMISC_DFI_INIT_COMPLETE_EN); stm32mp_ddr_wait_sw_done_ack(ctl); } void stm32mp1_ddr_init(struct stm32mp_ddr_priv *priv, struct stm32mp_ddr_config *config) { uint32_t pir; int ret = -EINVAL; if ((config->c_reg.mstr & DDRCTRL_MSTR_DDR3) != 0U) { ret = stm32mp_board_ddr_power_init(STM32MP_DDR3); } else if ((config->c_reg.mstr & DDRCTRL_MSTR_LPDDR2) != 0U) { ret = stm32mp_board_ddr_power_init(STM32MP_LPDDR2); } else if ((config->c_reg.mstr & DDRCTRL_MSTR_LPDDR3) != 0U) { ret = stm32mp_board_ddr_power_init(STM32MP_LPDDR3); } else { ERROR("DDR type not supported\n"); } if (ret != 0) { panic(); } VERBOSE("name = %s\n", config->info.name); VERBOSE("speed = %u kHz\n", config->info.speed); VERBOSE("size = 0x%x\n", config->info.size); /* DDR INIT SEQUENCE */ /* * 1. Program the DWC_ddr_umctl2 registers * nota: check DFIMISC.dfi_init_complete = 0 */ /* 1.1 RESETS: presetn, core_ddrc_rstn, aresetn */ mmio_setbits_32(priv->rcc + RCC_DDRITFCR, RCC_DDRITFCR_DDRCAPBRST); mmio_setbits_32(priv->rcc + RCC_DDRITFCR, RCC_DDRITFCR_DDRCAXIRST); mmio_setbits_32(priv->rcc + RCC_DDRITFCR, RCC_DDRITFCR_DDRCORERST); mmio_setbits_32(priv->rcc + RCC_DDRITFCR, RCC_DDRITFCR_DPHYAPBRST); mmio_setbits_32(priv->rcc + RCC_DDRITFCR, RCC_DDRITFCR_DPHYRST); mmio_setbits_32(priv->rcc + RCC_DDRITFCR, RCC_DDRITFCR_DPHYCTLRST); /* 1.2. start CLOCK */ if (stm32mp1_ddr_clk_enable(priv, config->info.speed) != 0) { panic(); } /* 1.3. deassert reset */ /* De-assert PHY rstn and ctl_rstn via DPHYRST and DPHYCTLRST. */ mmio_clrbits_32(priv->rcc + RCC_DDRITFCR, RCC_DDRITFCR_DPHYRST); mmio_clrbits_32(priv->rcc + RCC_DDRITFCR, RCC_DDRITFCR_DPHYCTLRST); /* * De-assert presetn once the clocks are active * and stable via DDRCAPBRST bit. */ mmio_clrbits_32(priv->rcc + RCC_DDRITFCR, RCC_DDRITFCR_DDRCAPBRST); /* 1.4. wait 128 cycles to permit initialization of end logic */ udelay(2); /* For PCLK = 133MHz => 1 us is enough, 2 to allow lower frequency */ /* 1.5. initialize registers ddr_umctl2 */ /* Stop uMCTL2 before PHY is ready */ mmio_clrbits_32((uintptr_t)&priv->ctl->dfimisc, DDRCTRL_DFIMISC_DFI_INIT_COMPLETE_EN); VERBOSE("[0x%lx] dfimisc = 0x%x\n", (uintptr_t)&priv->ctl->dfimisc, mmio_read_32((uintptr_t)&priv->ctl->dfimisc)); stm32mp_ddr_set_reg(priv, REG_REG, &config->c_reg, ddr_registers); /* DDR3 = don't set DLLOFF for init mode */ if ((config->c_reg.mstr & (DDRCTRL_MSTR_DDR3 | DDRCTRL_MSTR_DLL_OFF_MODE)) == (DDRCTRL_MSTR_DDR3 | DDRCTRL_MSTR_DLL_OFF_MODE)) { VERBOSE("deactivate DLL OFF in mstr\n"); mmio_clrbits_32((uintptr_t)&priv->ctl->mstr, DDRCTRL_MSTR_DLL_OFF_MODE); VERBOSE("[0x%lx] mstr = 0x%x\n", (uintptr_t)&priv->ctl->mstr, mmio_read_32((uintptr_t)&priv->ctl->mstr)); } stm32mp_ddr_set_reg(priv, REG_TIMING, &config->c_timing, ddr_registers); stm32mp_ddr_set_reg(priv, REG_MAP, &config->c_map, ddr_registers); /* Skip CTRL init, SDRAM init is done by PHY PUBL */ mmio_clrsetbits_32((uintptr_t)&priv->ctl->init0, DDRCTRL_INIT0_SKIP_DRAM_INIT_MASK, DDRCTRL_INIT0_SKIP_DRAM_INIT_NORMAL); VERBOSE("[0x%lx] init0 = 0x%x\n", (uintptr_t)&priv->ctl->init0, mmio_read_32((uintptr_t)&priv->ctl->init0)); stm32mp_ddr_set_reg(priv, REG_PERF, &config->c_perf, ddr_registers); /* 2. deassert reset signal core_ddrc_rstn, aresetn and presetn */ mmio_clrbits_32(priv->rcc + RCC_DDRITFCR, RCC_DDRITFCR_DDRCORERST); mmio_clrbits_32(priv->rcc + RCC_DDRITFCR, RCC_DDRITFCR_DDRCAXIRST); mmio_clrbits_32(priv->rcc + RCC_DDRITFCR, RCC_DDRITFCR_DPHYAPBRST); /* * 3. start PHY init by accessing relevant PUBL registers * (DXGCR, DCR, PTR*, MR*, DTPR*) */ stm32mp_ddr_set_reg(priv, REGPHY_REG, &config->p_reg, ddr_registers); stm32mp_ddr_set_reg(priv, REGPHY_TIMING, &config->p_timing, ddr_registers); /* DDR3 = don't set DLLOFF for init mode */ if ((config->c_reg.mstr & (DDRCTRL_MSTR_DDR3 | DDRCTRL_MSTR_DLL_OFF_MODE)) == (DDRCTRL_MSTR_DDR3 | DDRCTRL_MSTR_DLL_OFF_MODE)) { VERBOSE("deactivate DLL OFF in mr1\n"); mmio_clrbits_32((uintptr_t)&priv->phy->mr1, BIT(0)); VERBOSE("[0x%lx] mr1 = 0x%x\n", (uintptr_t)&priv->phy->mr1, mmio_read_32((uintptr_t)&priv->phy->mr1)); } /* * 4. Monitor PHY init status by polling PUBL register PGSR.IDONE * Perform DDR PHY DRAM initialization and Gate Training Evaluation */ stm32mp1_ddrphy_idone_wait(priv->phy); /* * 5. Indicate to PUBL that controller performs SDRAM initialization * by setting PIR.INIT and PIR CTLDINIT and pool PGSR.IDONE * DRAM init is done by PHY, init0.skip_dram.init = 1 */ pir = DDRPHYC_PIR_DLLSRST | DDRPHYC_PIR_DLLLOCK | DDRPHYC_PIR_ZCAL | DDRPHYC_PIR_ITMSRST | DDRPHYC_PIR_DRAMINIT | DDRPHYC_PIR_ICPC; if ((config->c_reg.mstr & DDRCTRL_MSTR_DDR3) != 0U) { pir |= DDRPHYC_PIR_DRAMRST; /* Only for DDR3 */ } stm32mp1_ddrphy_init(priv->phy, pir); /* * 6. SET DFIMISC.dfi_init_complete_en to 1 * Enable quasi-dynamic register programming. */ stm32mp_ddr_start_sw_done(priv->ctl); mmio_setbits_32((uintptr_t)&priv->ctl->dfimisc, DDRCTRL_DFIMISC_DFI_INIT_COMPLETE_EN); VERBOSE("[0x%lx] dfimisc = 0x%x\n", (uintptr_t)&priv->ctl->dfimisc, mmio_read_32((uintptr_t)&priv->ctl->dfimisc)); stm32mp_ddr_wait_sw_done_ack(priv->ctl); /* * 7. Wait for DWC_ddr_umctl2 to move to normal operation mode * by monitoring STAT.operating_mode signal */ /* Wait uMCTL2 ready */ stm32mp1_wait_operating_mode(priv, DDRCTRL_STAT_OPERATING_MODE_NORMAL); /* Switch to DLL OFF mode */ if ((config->c_reg.mstr & DDRCTRL_MSTR_DLL_OFF_MODE) != 0U) { stm32mp1_ddr3_dll_off(priv); } VERBOSE("DDR DQS training : "); /* * 8. Disable Auto refresh and power down by setting * - RFSHCTL3.dis_au_refresh = 1 * - PWRCTL.powerdown_en = 0 * - DFIMISC.dfiinit_complete_en = 0 */ stm32mp1_refresh_disable(priv->ctl); /* * 9. Program PUBL PGCR to enable refresh during training * and rank to train * not done => keep the programed value in PGCR */ /* * 10. configure PUBL PIR register to specify which training step * to run * RVTRN is executed only on LPDDR2/LPDDR3 */ pir = DDRPHYC_PIR_QSTRN; if ((config->c_reg.mstr & DDRCTRL_MSTR_DDR3) == 0U) { pir |= DDRPHYC_PIR_RVTRN; } stm32mp1_ddrphy_init(priv->phy, pir); /* 11. monitor PUB PGSR.IDONE to poll cpmpletion of training sequence */ stm32mp1_ddrphy_idone_wait(priv->phy); /* * 12. set back registers in step 8 to the original values if desidered */ stm32mp1_refresh_restore(priv->ctl, config->c_reg.rfshctl3, config->c_reg.pwrctl); stm32mp_ddr_enable_axi_port(priv->ctl); }