1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright 2016 Freescale Semiconductor, Inc. 4 */ 5 6 /* 7 * Generic driver for Freescale MMDC(Multi Mode DDR Controller). 8 */ 9 10 #include <common.h> 11 #include <fsl_mmdc.h> 12 #include <asm/io.h> 13 14 static void set_wait_for_bits_clear(void *ptr, u32 value, u32 bits) 15 { 16 int timeout = 1000; 17 18 out_be32(ptr, value); 19 20 while (in_be32(ptr) & bits) { 21 udelay(100); 22 timeout--; 23 } 24 if (timeout <= 0) 25 printf("Error: %p wait for clear timeout.\n", ptr); 26 } 27 28 void mmdc_init(const struct fsl_mmdc_info *priv) 29 { 30 struct mmdc_regs *mmdc = (struct mmdc_regs *)CONFIG_SYS_FSL_DDR_ADDR; 31 unsigned int tmp; 32 33 /* 1. set configuration request */ 34 out_be32(&mmdc->mdscr, MDSCR_ENABLE_CON_REQ); 35 36 /* 2. configure the desired timing parameters */ 37 out_be32(&mmdc->mdotc, priv->mdotc); 38 out_be32(&mmdc->mdcfg0, priv->mdcfg0); 39 out_be32(&mmdc->mdcfg1, priv->mdcfg1); 40 out_be32(&mmdc->mdcfg2, priv->mdcfg2); 41 42 /* 3. configure DDR type and other miscellaneous parameters */ 43 out_be32(&mmdc->mdmisc, priv->mdmisc); 44 out_be32(&mmdc->mpmur0, MMDC_MPMUR0_FRC_MSR); 45 out_be32(&mmdc->mdrwd, priv->mdrwd); 46 out_be32(&mmdc->mpodtctrl, priv->mpodtctrl); 47 48 /* 4. configure the required delay while leaving reset */ 49 out_be32(&mmdc->mdor, priv->mdor); 50 51 /* 5. configure DDR physical parameters */ 52 /* set row/column address width, burst length, data bus width */ 53 tmp = priv->mdctl & ~(MDCTL_SDE0 | MDCTL_SDE1); 54 out_be32(&mmdc->mdctl, tmp); 55 /* configure address space partition */ 56 out_be32(&mmdc->mdasp, priv->mdasp); 57 58 /* 6. perform a ZQ calibration - not needed here, doing in #8b */ 59 60 /* 7. enable MMDC with the desired chip select */ 61 #if (CONFIG_CHIP_SELECTS_PER_CTRL == 1) 62 out_be32(&mmdc->mdctl, tmp | MDCTL_SDE0); 63 #elif (CONFIG_CHIP_SELECTS_PER_CTRL == 2) 64 out_be32(&mmdc->mdctl, tmp | MDCTL_SDE0 | MDCTL_SDE1); 65 #endif 66 67 /* 8a. dram init sequence: update MRs for ZQ, ODT, PRE, etc */ 68 out_be32(&mmdc->mdscr, CMD_ADDR_LSB_MR_ADDR(8) | MDSCR_ENABLE_CON_REQ | 69 CMD_LOAD_MODE_REG | CMD_BANK_ADDR_2); 70 71 out_be32(&mmdc->mdscr, CMD_ADDR_LSB_MR_ADDR(0) | MDSCR_ENABLE_CON_REQ | 72 CMD_LOAD_MODE_REG | CMD_BANK_ADDR_3); 73 74 out_be32(&mmdc->mdscr, CMD_ADDR_LSB_MR_ADDR(4) | MDSCR_ENABLE_CON_REQ | 75 CMD_LOAD_MODE_REG | CMD_BANK_ADDR_1); 76 77 out_be32(&mmdc->mdscr, CMD_ADDR_MSB_MR_OP(0x19) | 78 CMD_ADDR_LSB_MR_ADDR(0x30) | 79 MDSCR_ENABLE_CON_REQ | 80 CMD_LOAD_MODE_REG | CMD_BANK_ADDR_0); 81 82 /* 8b. ZQ calibration */ 83 out_be32(&mmdc->mdscr, CMD_ADDR_MSB_MR_OP(0x4) | MDSCR_ENABLE_CON_REQ | 84 CMD_ZQ_CALIBRATION | CMD_BANK_ADDR_0); 85 86 set_wait_for_bits_clear(&mmdc->mpzqhwctrl, priv->mpzqhwctrl, 87 MPZQHWCTRL_ZQ_HW_FORCE); 88 89 /* 9a. calibrations now, wr lvl */ 90 out_be32(&mmdc->mdscr, CMD_ADDR_LSB_MR_ADDR(0x84) | 91 MDSCR_ENABLE_CON_REQ | 92 CMD_LOAD_MODE_REG | CMD_BANK_ADDR_1); 93 94 out_be32(&mmdc->mdscr, MDSCR_ENABLE_CON_REQ | MDSCR_WL_EN | 95 CMD_NORMAL); 96 97 set_wait_for_bits_clear(&mmdc->mpwlgcr, MPWLGCR_HW_WL_EN, 98 MPWLGCR_HW_WL_EN); 99 100 mdelay(1); 101 102 out_be32(&mmdc->mdscr, CMD_ADDR_LSB_MR_ADDR(4) | MDSCR_ENABLE_CON_REQ | 103 CMD_LOAD_MODE_REG | CMD_BANK_ADDR_1); 104 out_be32(&mmdc->mdscr, MDSCR_ENABLE_CON_REQ); 105 106 mdelay(1); 107 108 /* 9b. read DQS gating calibration */ 109 out_be32(&mmdc->mdscr, CMD_ADDR_MSB_MR_OP(4) | MDSCR_ENABLE_CON_REQ | 110 CMD_PRECHARGE_BANK_OPEN | CMD_BANK_ADDR_0); 111 112 out_be32(&mmdc->mdscr, CMD_ADDR_LSB_MR_ADDR(4) | MDSCR_ENABLE_CON_REQ | 113 CMD_LOAD_MODE_REG | CMD_BANK_ADDR_3); 114 115 out_be32(&mmdc->mppdcmpr2, MPPDCMPR2_MPR_COMPARE_EN); 116 117 /* set absolute read delay offset */ 118 if (priv->mprddlctl) 119 out_be32(&mmdc->mprddlctl, priv->mprddlctl); 120 else 121 out_be32(&mmdc->mprddlctl, MMDC_MPRDDLCTL_DEFAULT_DELAY); 122 123 set_wait_for_bits_clear(&mmdc->mpdgctrl0, 124 AUTO_RD_DQS_GATING_CALIBRATION_EN, 125 AUTO_RD_DQS_GATING_CALIBRATION_EN); 126 127 out_be32(&mmdc->mdscr, MDSCR_ENABLE_CON_REQ | CMD_LOAD_MODE_REG | 128 CMD_BANK_ADDR_3); 129 130 /* 9c. read calibration */ 131 out_be32(&mmdc->mdscr, CMD_ADDR_MSB_MR_OP(4) | MDSCR_ENABLE_CON_REQ | 132 CMD_PRECHARGE_BANK_OPEN | CMD_BANK_ADDR_0); 133 out_be32(&mmdc->mdscr, CMD_ADDR_LSB_MR_ADDR(4) | MDSCR_ENABLE_CON_REQ | 134 CMD_LOAD_MODE_REG | CMD_BANK_ADDR_3); 135 out_be32(&mmdc->mppdcmpr2, MPPDCMPR2_MPR_COMPARE_EN); 136 set_wait_for_bits_clear(&mmdc->mprddlhwctl, 137 MPRDDLHWCTL_AUTO_RD_CALIBRATION_EN, 138 MPRDDLHWCTL_AUTO_RD_CALIBRATION_EN); 139 140 out_be32(&mmdc->mdscr, MDSCR_ENABLE_CON_REQ | CMD_LOAD_MODE_REG | 141 CMD_BANK_ADDR_3); 142 143 /* 10. configure power-down, self-refresh entry, exit parameters */ 144 out_be32(&mmdc->mdpdc, priv->mdpdc); 145 out_be32(&mmdc->mapsr, MMDC_MAPSR_PWR_SAV_CTRL_STAT); 146 147 /* 11. ZQ config again? do nothing here */ 148 149 /* 12. refresh scheme */ 150 set_wait_for_bits_clear(&mmdc->mdref, priv->mdref, 151 MDREF_START_REFRESH); 152 153 /* 13. disable CON_REQ */ 154 out_be32(&mmdc->mdscr, MDSCR_DISABLE_CFG_REQ); 155 } 156