/* * Copyright (C) 2013 Atmel Corporation * Bo Shen * * Copyright (C) 2015 Atmel Corporation * Wenyou Yang * * SPDX-License-Identifier: GPL-2.0+ */ #include #include #include #define SAMA5D3_MPDDRC_VERSION 0x140 static inline void atmel_mpddr_op(const struct atmel_mpddr *mpddr, int mode, u32 ram_address) { writel(mode, &mpddr->mr); writel(0, ram_address); } static int ddr2_decodtype_is_seq(const unsigned int base, u32 cr) { struct atmel_mpddr *mpddr = (struct atmel_mpddr *)base; u16 version = readl(&mpddr->version) & 0xffff; if ((version >= SAMA5D3_MPDDRC_VERSION) && (cr & ATMEL_MPDDRC_CR_DECOD_INTERLEAVED)) return 0; return 1; } int ddr2_init(const unsigned int base, const unsigned int ram_address, const struct atmel_mpddrc_config *mpddr_value) { const struct atmel_mpddr *mpddr = (struct atmel_mpddr *)base; u32 ba_off, cr; /* Compute bank offset according to NC in configuration register */ ba_off = (mpddr_value->cr & ATMEL_MPDDRC_CR_NC_MASK) + 9; if (ddr2_decodtype_is_seq(base, mpddr_value->cr)) ba_off += ((mpddr_value->cr & ATMEL_MPDDRC_CR_NR_MASK) >> 2) + 11; ba_off += (mpddr_value->md & ATMEL_MPDDRC_MD_DBW_MASK) ? 1 : 2; /* Program the memory device type into the memory device register */ writel(mpddr_value->md, &mpddr->md); /* Program the configuration register */ writel(mpddr_value->cr, &mpddr->cr); /* Program the timing register */ writel(mpddr_value->tpr0, &mpddr->tpr0); writel(mpddr_value->tpr1, &mpddr->tpr1); writel(mpddr_value->tpr2, &mpddr->tpr2); /* Issue a NOP command */ atmel_mpddr_op(mpddr, ATMEL_MPDDRC_MR_MODE_NOP_CMD, ram_address); /* A 200 us is provided to precede any signal toggle */ udelay(200); /* Issue a NOP command */ atmel_mpddr_op(mpddr, ATMEL_MPDDRC_MR_MODE_NOP_CMD, ram_address); /* Issue an all banks precharge command */ atmel_mpddr_op(mpddr, ATMEL_MPDDRC_MR_MODE_PRCGALL_CMD, ram_address); /* Issue an extended mode register set(EMRS2) to choose operation */ atmel_mpddr_op(mpddr, ATMEL_MPDDRC_MR_MODE_EXT_LMR_CMD, ram_address + (0x2 << ba_off)); /* Issue an extended mode register set(EMRS3) to set EMSR to 0 */ atmel_mpddr_op(mpddr, ATMEL_MPDDRC_MR_MODE_EXT_LMR_CMD, ram_address + (0x3 << ba_off)); /* * Issue an extended mode register set(EMRS1) to enable DLL and * program D.I.C (output driver impedance control) */ atmel_mpddr_op(mpddr, ATMEL_MPDDRC_MR_MODE_EXT_LMR_CMD, ram_address + (0x1 << ba_off)); /* Enable DLL reset */ cr = readl(&mpddr->cr); writel(cr | ATMEL_MPDDRC_CR_DLL_RESET_ENABLED, &mpddr->cr); /* A mode register set(MRS) cycle is issued to reset DLL */ atmel_mpddr_op(mpddr, ATMEL_MPDDRC_MR_MODE_LMR_CMD, ram_address); /* Issue an all banks precharge command */ atmel_mpddr_op(mpddr, ATMEL_MPDDRC_MR_MODE_PRCGALL_CMD, ram_address); /* Two auto-refresh (CBR) cycles are provided */ atmel_mpddr_op(mpddr, ATMEL_MPDDRC_MR_MODE_RFSH_CMD, ram_address); atmel_mpddr_op(mpddr, ATMEL_MPDDRC_MR_MODE_RFSH_CMD, ram_address); /* Disable DLL reset */ cr = readl(&mpddr->cr); writel(cr & (~ATMEL_MPDDRC_CR_DLL_RESET_ENABLED), &mpddr->cr); /* A mode register set (MRS) cycle is issued to disable DLL reset */ atmel_mpddr_op(mpddr, ATMEL_MPDDRC_MR_MODE_LMR_CMD, ram_address); /* Set OCD calibration in default state */ cr = readl(&mpddr->cr); writel(cr | ATMEL_MPDDRC_CR_OCD_DEFAULT, &mpddr->cr); /* * An extended mode register set (EMRS1) cycle is issued * to OCD default value */ atmel_mpddr_op(mpddr, ATMEL_MPDDRC_MR_MODE_EXT_LMR_CMD, ram_address + (0x1 << ba_off)); /* OCD calibration mode exit */ cr = readl(&mpddr->cr); writel(cr & (~ATMEL_MPDDRC_CR_OCD_DEFAULT), &mpddr->cr); /* * An extended mode register set (EMRS1) cycle is issued * to enable OCD exit */ atmel_mpddr_op(mpddr, ATMEL_MPDDRC_MR_MODE_EXT_LMR_CMD, ram_address + (0x1 << ba_off)); /* A nornal mode command is provided */ atmel_mpddr_op(mpddr, ATMEL_MPDDRC_MR_MODE_NORMAL_CMD, ram_address); /* Perform a write access to any DDR2-SDRAM address */ writel(0, ram_address); /* Write the refresh rate */ writel(mpddr_value->rtr, &mpddr->rtr); return 0; } int ddr3_init(const unsigned int base, const unsigned int ram_address, const struct atmel_mpddrc_config *mpddr_value) { struct atmel_mpddr *mpddr = (struct atmel_mpddr *)base; u32 ba_off; /* Compute bank offset according to NC in configuration register */ ba_off = (mpddr_value->cr & ATMEL_MPDDRC_CR_NC_MASK) + 9; if (ddr2_decodtype_is_seq(base, mpddr_value->cr)) ba_off += ((mpddr_value->cr & ATMEL_MPDDRC_CR_NR_MASK) >> 2) + 11; ba_off += (mpddr_value->md & ATMEL_MPDDRC_MD_DBW_MASK) ? 1 : 2; /* Program the memory device type */ writel(mpddr_value->md, &mpddr->md); /* * Program features of the DDR3-SDRAM device and timing parameters */ writel(mpddr_value->cr, &mpddr->cr); writel(mpddr_value->tpr0, &mpddr->tpr0); writel(mpddr_value->tpr1, &mpddr->tpr1); writel(mpddr_value->tpr2, &mpddr->tpr2); /* A NOP command is issued to the DDR3-SRAM */ atmel_mpddr_op(mpddr, ATMEL_MPDDRC_MR_MODE_NOP_CMD, ram_address); /* A pause of at least 500us must be observed before a single toggle. */ udelay(500); /* A NOP command is issued to the DDR3-SDRAM */ atmel_mpddr_op(mpddr, ATMEL_MPDDRC_MR_MODE_NOP_CMD, ram_address); /* * An Extended Mode Register Set (EMRS2) cycle is issued to choose * between commercial or high temperature operations. */ atmel_mpddr_op(mpddr, ATMEL_MPDDRC_MR_MODE_EXT_LMR_CMD, ram_address + (0x2 << ba_off)); /* * Step 7: An Extended Mode Register Set (EMRS3) cycle is issued to set * the Extended Mode Register to 0. */ atmel_mpddr_op(mpddr, ATMEL_MPDDRC_MR_MODE_EXT_LMR_CMD, ram_address + (0x3 << ba_off)); /* * An Extended Mode Register Set (EMRS1) cycle is issued to disable and * to program O.D.S. (Output Driver Strength). */ atmel_mpddr_op(mpddr, ATMEL_MPDDRC_MR_MODE_EXT_LMR_CMD, ram_address + (0x1 << ba_off)); /* * Write a one to the DLL bit (enable DLL reset) in the MPDDRC * Configuration Register. */ /* A Mode Register Set (MRS) cycle is issued to reset DLL. */ atmel_mpddr_op(mpddr, ATMEL_MPDDRC_MR_MODE_LMR_CMD, ram_address); udelay(50); /* * A Calibration command (MRS) is issued to calibrate RTT and RON * values for the Process Voltage Temperature (PVT). */ atmel_mpddr_op(mpddr, ATMEL_MPDDRC_MR_MODE_DEEP_CMD, ram_address); /* A Normal Mode command is provided. */ atmel_mpddr_op(mpddr, ATMEL_MPDDRC_MR_MODE_NORMAL_CMD, ram_address); /* Perform a write access to any DDR3-SDRAM address. */ writel(0, ram_address); /* * Write the refresh rate into the COUNT field in the MPDDRC * Refresh Timer Register (MPDDRC_RTR): */ writel(mpddr_value->rtr, &mpddr->rtr); return 0; }