arm: exynos: clean up checkpatch issues

[people/ms/u-boot.git] / arch / arm / mach-exynos / dmc_init_ddr3.c

/*
 * DDR3 mem setup file for board based on EXYNOS5
 *
 * Copyright (C) 2012 Samsung Electronics
 *
 * SPDX-License-Identifier:     GPL-2.0+
 */

#include <common.h>
#include <config.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
#include <asm/arch/cpu.h>
#include <asm/arch/dmc.h>
#include <asm/arch/power.h>
#include "common_setup.h"
#include "exynos5_setup.h"
#include "clock_init.h"

#define TIMEOUT_US              10000
#define NUM_BYTE_LANES          4
#define DEFAULT_DQS             8
#define DEFAULT_DQS_X4          ((DEFAULT_DQS << 24) || (DEFAULT_DQS << 16) \
                                || (DEFAULT_DQS << 8) || (DEFAULT_DQS << 0))

#ifdef CONFIG_EXYNOS5250
static void reset_phy_ctrl(void)
{
        struct exynos5_clock *clk =
                (struct exynos5_clock *)samsung_get_base_clock();

        writel(DDR3PHY_CTRL_PHY_RESET_OFF, &clk->lpddr3phy_ctrl);
        writel(DDR3PHY_CTRL_PHY_RESET, &clk->lpddr3phy_ctrl);
}

int ddr3_mem_ctrl_init(struct mem_timings *mem, int reset)
{
        unsigned int val;
        struct exynos5_phy_control *phy0_ctrl, *phy1_ctrl;
        struct exynos5_dmc *dmc;
        int i;

        phy0_ctrl = (struct exynos5_phy_control *)samsung_get_base_dmc_phy();
        phy1_ctrl = (struct exynos5_phy_control *)(samsung_get_base_dmc_phy()
                                                        + DMC_OFFSET);
        dmc = (struct exynos5_dmc *)samsung_get_base_dmc_ctrl();

        if (reset)
                reset_phy_ctrl();

        /* Set Impedance Output Driver */
        val = (mem->impedance << CA_CK_DRVR_DS_OFFSET) |
                (mem->impedance << CA_CKE_DRVR_DS_OFFSET) |
                (mem->impedance << CA_CS_DRVR_DS_OFFSET) |
                (mem->impedance << CA_ADR_DRVR_DS_OFFSET);
        writel(val, &phy0_ctrl->phy_con39);
        writel(val, &phy1_ctrl->phy_con39);

        /* Set Read Latency and Burst Length for PHY0 and PHY1 */
        val = (mem->ctrl_bstlen << PHY_CON42_CTRL_BSTLEN_SHIFT) |
                (mem->ctrl_rdlat << PHY_CON42_CTRL_RDLAT_SHIFT);
        writel(val, &phy0_ctrl->phy_con42);
        writel(val, &phy1_ctrl->phy_con42);

        /* ZQ Calibration */
        if (dmc_config_zq(mem, &phy0_ctrl->phy_con16, &phy1_ctrl->phy_con16,
                          &phy0_ctrl->phy_con17, &phy1_ctrl->phy_con17))
                return SETUP_ERR_ZQ_CALIBRATION_FAILURE;

        /* DQ Signal */
        writel(mem->phy0_pulld_dqs, &phy0_ctrl->phy_con14);
        writel(mem->phy1_pulld_dqs, &phy1_ctrl->phy_con14);

        writel(mem->concontrol | (mem->rd_fetch << CONCONTROL_RD_FETCH_SHIFT)
                | (mem->dfi_init_start << CONCONTROL_DFI_INIT_START_SHIFT),
                &dmc->concontrol);

        update_reset_dll(&dmc->phycontrol0, DDR_MODE_DDR3);

        /* DQS Signal */
        writel(mem->phy0_dqs, &phy0_ctrl->phy_con4);
        writel(mem->phy1_dqs, &phy1_ctrl->phy_con4);

        writel(mem->phy0_dq, &phy0_ctrl->phy_con6);
        writel(mem->phy1_dq, &phy1_ctrl->phy_con6);

        writel(mem->phy0_tFS, &phy0_ctrl->phy_con10);
        writel(mem->phy1_tFS, &phy1_ctrl->phy_con10);

        val = (mem->ctrl_start_point << PHY_CON12_CTRL_START_POINT_SHIFT) |
                (mem->ctrl_inc << PHY_CON12_CTRL_INC_SHIFT) |
                (mem->ctrl_dll_on << PHY_CON12_CTRL_DLL_ON_SHIFT) |
                (mem->ctrl_ref << PHY_CON12_CTRL_REF_SHIFT);
        writel(val, &phy0_ctrl->phy_con12);
        writel(val, &phy1_ctrl->phy_con12);

        /* Start DLL locking */
        writel(val | (mem->ctrl_start << PHY_CON12_CTRL_START_SHIFT),
               &phy0_ctrl->phy_con12);
        writel(val | (mem->ctrl_start << PHY_CON12_CTRL_START_SHIFT),
               &phy1_ctrl->phy_con12);

        update_reset_dll(&dmc->phycontrol0, DDR_MODE_DDR3);

        writel(mem->concontrol | (mem->rd_fetch << CONCONTROL_RD_FETCH_SHIFT),
               &dmc->concontrol);

        /* Memory Channel Inteleaving Size */
        writel(mem->iv_size, &dmc->ivcontrol);

        writel(mem->memconfig, &dmc->memconfig0);
        writel(mem->memconfig, &dmc->memconfig1);
        writel(mem->membaseconfig0, &dmc->membaseconfig0);
        writel(mem->membaseconfig1, &dmc->membaseconfig1);

        /* Precharge Configuration */
        writel(mem->prechconfig_tp_cnt << PRECHCONFIG_TP_CNT_SHIFT,
               &dmc->prechconfig);

        /* Power Down mode Configuration */
        writel(mem->dpwrdn_cyc << PWRDNCONFIG_DPWRDN_CYC_SHIFT |
                mem->dsref_cyc << PWRDNCONFIG_DSREF_CYC_SHIFT,
                &dmc->pwrdnconfig);

        /* TimingRow, TimingData, TimingPower and Timingaref
         * values as per Memory AC parameters
         */
        writel(mem->timing_ref, &dmc->timingref);
        writel(mem->timing_row, &dmc->timingrow);
        writel(mem->timing_data, &dmc->timingdata);
        writel(mem->timing_power, &dmc->timingpower);

        /* Send PALL command */
        dmc_config_prech(mem, &dmc->directcmd);

        /* Send NOP, MRS and ZQINIT commands */
        dmc_config_mrs(mem, &dmc->directcmd);

        if (mem->gate_leveling_enable) {
                val = PHY_CON0_RESET_VAL;
                val |= P0_CMD_EN;
                writel(val, &phy0_ctrl->phy_con0);
                writel(val, &phy1_ctrl->phy_con0);

                val = PHY_CON2_RESET_VAL;
                val |= INIT_DESKEW_EN;
                writel(val, &phy0_ctrl->phy_con2);
                writel(val, &phy1_ctrl->phy_con2);

                val = PHY_CON0_RESET_VAL;
                val |= P0_CMD_EN;
                val |= BYTE_RDLVL_EN;
                writel(val, &phy0_ctrl->phy_con0);
                writel(val, &phy1_ctrl->phy_con0);

                val = (mem->ctrl_start_point <<
                                PHY_CON12_CTRL_START_POINT_SHIFT) |
                        (mem->ctrl_inc << PHY_CON12_CTRL_INC_SHIFT) |
                        (mem->ctrl_force << PHY_CON12_CTRL_FORCE_SHIFT) |
                        (mem->ctrl_start << PHY_CON12_CTRL_START_SHIFT) |
                        (mem->ctrl_ref << PHY_CON12_CTRL_REF_SHIFT);
                writel(val, &phy0_ctrl->phy_con12);
                writel(val, &phy1_ctrl->phy_con12);

                val = PHY_CON2_RESET_VAL;
                val |= INIT_DESKEW_EN;
                val |= RDLVL_GATE_EN;
                writel(val, &phy0_ctrl->phy_con2);
                writel(val, &phy1_ctrl->phy_con2);

                val = PHY_CON0_RESET_VAL;
                val |= P0_CMD_EN;
                val |= BYTE_RDLVL_EN;
                val |= CTRL_SHGATE;
                writel(val, &phy0_ctrl->phy_con0);
                writel(val, &phy1_ctrl->phy_con0);

                val = PHY_CON1_RESET_VAL;
                val &= ~(CTRL_GATEDURADJ_MASK);
                writel(val, &phy0_ctrl->phy_con1);
                writel(val, &phy1_ctrl->phy_con1);

                writel(CTRL_RDLVL_GATE_ENABLE, &dmc->rdlvl_config);
                i = TIMEOUT_US;
                while ((readl(&dmc->phystatus) &
                        (RDLVL_COMPLETE_CHO | RDLVL_COMPLETE_CH1)) !=
                        (RDLVL_COMPLETE_CHO | RDLVL_COMPLETE_CH1) && i > 0) {
                        /*
                         * TODO(waihong): Comment on how long this take to
                         * timeout
                         */
                        sdelay(100);
                        i--;
                }
                if (!i)
                        return SETUP_ERR_RDLV_COMPLETE_TIMEOUT;
                writel(CTRL_RDLVL_GATE_DISABLE, &dmc->rdlvl_config);

                writel(0, &phy0_ctrl->phy_con14);
                writel(0, &phy1_ctrl->phy_con14);

                val = (mem->ctrl_start_point <<
                                PHY_CON12_CTRL_START_POINT_SHIFT) |
                        (mem->ctrl_inc << PHY_CON12_CTRL_INC_SHIFT) |
                        (mem->ctrl_force << PHY_CON12_CTRL_FORCE_SHIFT) |
                        (mem->ctrl_start << PHY_CON12_CTRL_START_SHIFT) |
                        (mem->ctrl_dll_on << PHY_CON12_CTRL_DLL_ON_SHIFT) |
                        (mem->ctrl_ref << PHY_CON12_CTRL_REF_SHIFT);
                writel(val, &phy0_ctrl->phy_con12);
                writel(val, &phy1_ctrl->phy_con12);

                update_reset_dll(&dmc->phycontrol0, DDR_MODE_DDR3);
        }

        /* Send PALL command */
        dmc_config_prech(mem, &dmc->directcmd);

        writel(mem->memcontrol, &dmc->memcontrol);

        /* Set DMC Concontrol and enable auto-refresh counter */
        writel(mem->concontrol | (mem->rd_fetch << CONCONTROL_RD_FETCH_SHIFT)
                | (mem->aref_en << CONCONTROL_AREF_EN_SHIFT), &dmc->concontrol);
        return 0;
}
#endif

#ifdef CONFIG_EXYNOS5420
/**
 * RAM address to use in the test.
 *
 * We'll use 4 words at this address and 4 at this address + 0x80 (Ares
 * interleaves channels every 128 bytes).  This will allow us to evaluate all of
 * the chips in a 1 chip per channel (2GB) system and half the chips in a 2
 * chip per channel (4GB) system.  We can't test the 2nd chip since we need to
 * do tests before the 2nd chip is enabled.  Looking at the 2nd chip isn't
 * critical because the 1st and 2nd chip have very similar timings (they'd
 * better have similar timings, since there's only a single adjustment that is
 * shared by both chips).
 */
const unsigned int test_addr = CONFIG_SYS_SDRAM_BASE;

/* Test pattern with which RAM will be tested */
static const unsigned int test_pattern[] = {
        0x5a5a5a5a,
        0xa5a5a5a5,
        0xf0f0f0f0,
        0x0f0f0f0f,
};

/**
 * This function is a test vector for sw read leveling,
 * it compares the read data with the written data.
 *
 * @param ch                    DMC channel number
 * @param byte_lane             which DQS byte offset,
 *                              possible values are 0,1,2,3
 * @return                      TRUE if memory was good, FALSE if not.
 */
static bool dmc_valid_window_test_vector(int ch, int byte_lane)
{
        unsigned int read_data;
        unsigned int mask;
        int i;

        mask = 0xFF << (8 * byte_lane);

        for (i = 0; i < ARRAY_SIZE(test_pattern); i++) {
                read_data = readl(test_addr + i * 4 + ch * 0x80);
                if ((read_data & mask) != (test_pattern[i] & mask))
                        return false;
        }

        return true;
}

/**
 * This function returns current read offset value.
 *
 * @param phy_ctrl      pointer to the current phy controller
 */
static unsigned int dmc_get_read_offset_value(struct exynos5420_phy_control
                                               *phy_ctrl)
{
        return readl(&phy_ctrl->phy_con4);
}

/**
 * This function performs resync, so that slave DLL is updated.
 *
 * @param phy_ctrl      pointer to the current phy controller
 */
static void ddr_phy_set_do_resync(struct exynos5420_phy_control *phy_ctrl)
{
        setbits_le32(&phy_ctrl->phy_con10, PHY_CON10_CTRL_OFFSETR3);
        clrbits_le32(&phy_ctrl->phy_con10, PHY_CON10_CTRL_OFFSETR3);
}

/**
 * This function sets read offset value register with 'offset'.
 *
 * ...we also call call ddr_phy_set_do_resync().
 *
 * @param phy_ctrl      pointer to the current phy controller
 * @param offset        offset to read DQS
 */
static void dmc_set_read_offset_value(struct exynos5420_phy_control *phy_ctrl,
                                      unsigned int offset)
{
        writel(offset, &phy_ctrl->phy_con4);
        ddr_phy_set_do_resync(phy_ctrl);
}

/**
 * Convert a 2s complement byte to a byte with a sign bit.
 *
 * NOTE: you shouldn't use normal math on the number returned by this function.
 *   As an example, -10 = 0xf6.  After this function -10 = 0x8a.  If you wanted
 *   to do math and get the average of 10 and -10 (should be 0):
 *     0x8a + 0xa = 0x94 (-108)
 *     0x94 / 2   = 0xca (-54)
 *   ...and 0xca = sign bit plus 0x4a, or -74
 *
 * Also note that you lose the ability to represent -128 since there are two
 * representations of 0.
 *
 * @param b     The byte to convert in two's complement.
 * @return      The 7-bit value + sign bit.
 */

unsigned char make_signed_byte(signed char b)
{
        if (b < 0)
                return 0x80 | -b;
        else
                return b;
}

/**
 * Test various shifts starting at 'start' and going to 'end'.
 *
 * For each byte lane, we'll walk through shift starting at 'start' and going
 * to 'end' (inclusive).  When we are finally able to read the test pattern
 * we'll store the value in the results array.
 *
 * @param phy_ctrl              pointer to the current phy controller
 * @param ch                    channel number
 * @param start                 the start shift.  -127 to 127
 * @param end                   the end shift.  -127 to 127
 * @param results               we'll store results for each byte lane.
 */

void test_shifts(struct exynos5420_phy_control *phy_ctrl, int ch,
                 int start, int end, int results[NUM_BYTE_LANES])
{
        int incr = (start < end) ? 1 : -1;
        int byte_lane;

        for (byte_lane = 0; byte_lane < NUM_BYTE_LANES; byte_lane++) {
                int shift;

                dmc_set_read_offset_value(phy_ctrl, DEFAULT_DQS_X4);
                results[byte_lane] = DEFAULT_DQS;

                for (shift = start; shift != (end + incr); shift += incr) {
                        unsigned int byte_offsetr;
                        unsigned int offsetr;

                        byte_offsetr = make_signed_byte(shift);

                        offsetr = dmc_get_read_offset_value(phy_ctrl);
                        offsetr &= ~(0xFF << (8 * byte_lane));
                        offsetr |= (byte_offsetr << (8 * byte_lane));
                        dmc_set_read_offset_value(phy_ctrl, offsetr);

                        if (dmc_valid_window_test_vector(ch, byte_lane)) {
                                results[byte_lane] = shift;
                                break;
                        }
                }
        }
}

/**
 * This function performs SW read leveling to compensate DQ-DQS skew at
 * receiver it first finds the optimal read offset value on each DQS
 * then applies the value to PHY.
 *
 * Read offset value has its min margin and max margin. If read offset
 * value exceeds its min or max margin, read data will have corruption.
 * To avoid this we are doing sw read leveling.
 *
 * SW read leveling is:
 * 1> Finding offset value's left_limit and right_limit
 * 2> and calculate its center value
 * 3> finally programs that center value to PHY
 * 4> then PHY gets its optimal offset value.
 *
 * @param phy_ctrl              pointer to the current phy controller
 * @param ch                    channel number
 * @param coarse_lock_val       The coarse lock value read from PHY_CON13.
 *                              (0 - 0x7f)
 */
static void software_find_read_offset(struct exynos5420_phy_control *phy_ctrl,
                                      int ch, unsigned int coarse_lock_val)
{
        unsigned int offsetr_cent;
        int byte_lane;
        int left_limit;
        int right_limit;
        int left[NUM_BYTE_LANES];
        int right[NUM_BYTE_LANES];
        int i;

        /* Fill the memory with test patterns */
        for (i = 0; i < ARRAY_SIZE(test_pattern); i++)
                writel(test_pattern[i], test_addr + i * 4 + ch * 0x80);

        /* Figure out the limits we'll test with; keep -127 < limit < 127 */
        left_limit = DEFAULT_DQS - coarse_lock_val;
        right_limit = DEFAULT_DQS + coarse_lock_val;
        if (right_limit > 127)
                right_limit = 127;

        /* Fill in the location where reads were OK from left and right */
        test_shifts(phy_ctrl, ch, left_limit, right_limit, left);
        test_shifts(phy_ctrl, ch, right_limit, left_limit, right);

        /* Make a final value by taking the center between the left and right */
        offsetr_cent = 0;
        for (byte_lane = 0; byte_lane < NUM_BYTE_LANES; byte_lane++) {
                int temp_center;
                unsigned int vmwc;

                temp_center = (left[byte_lane] + right[byte_lane]) / 2;
                vmwc = make_signed_byte(temp_center);
                offsetr_cent |= vmwc << (8 * byte_lane);
        }
        dmc_set_read_offset_value(phy_ctrl, offsetr_cent);
}

int ddr3_mem_ctrl_init(struct mem_timings *mem, int reset)
{
        struct exynos5420_clock *clk =
                (struct exynos5420_clock *)samsung_get_base_clock();
        struct exynos5420_power *power =
                (struct exynos5420_power *)samsung_get_base_power();
        struct exynos5420_phy_control *phy0_ctrl, *phy1_ctrl;
        struct exynos5420_dmc *drex0, *drex1;
        struct exynos5420_tzasc *tzasc0, *tzasc1;
        struct exynos5_power *pmu;
        uint32_t val, n_lock_r, n_lock_w_phy0, n_lock_w_phy1;
        uint32_t lock0_info, lock1_info;
        int chip;
        int i;

        phy0_ctrl = (struct exynos5420_phy_control *)samsung_get_base_dmc_phy();
        phy1_ctrl = (struct exynos5420_phy_control *)(samsung_get_base_dmc_phy()
                                                        + DMC_OFFSET);
        drex0 = (struct exynos5420_dmc *)samsung_get_base_dmc_ctrl();
        drex1 = (struct exynos5420_dmc *)(samsung_get_base_dmc_ctrl()
                                                        + DMC_OFFSET);
        tzasc0 = (struct exynos5420_tzasc *)samsung_get_base_dmc_tzasc();
        tzasc1 = (struct exynos5420_tzasc *)(samsung_get_base_dmc_tzasc()
                                                        + DMC_OFFSET);
        pmu = (struct exynos5_power *)EXYNOS5420_POWER_BASE;

        if (CONFIG_NR_DRAM_BANKS > 4) {
                /* Need both controllers. */
                mem->memcontrol |= DMC_MEMCONTROL_NUM_CHIP_2;
                mem->chips_per_channel = 2;
                mem->chips_to_configure = 2;
        } else {
                /* 2GB requires a single controller */
                mem->memcontrol |= DMC_MEMCONTROL_NUM_CHIP_1;
        }

        /* Enable PAUSE for DREX */
        setbits_le32(&clk->pause, ENABLE_BIT);

        /* Enable BYPASS mode */
        setbits_le32(&clk->bpll_con1, BYPASS_EN);

        writel(MUX_BPLL_SEL_FOUTBPLL, &clk->src_cdrex);
        do {
                val = readl(&clk->mux_stat_cdrex);
                val &= BPLL_SEL_MASK;
        } while (val != FOUTBPLL);

        clrbits_le32(&clk->bpll_con1, BYPASS_EN);

        /* Specify the DDR memory type as DDR3 */
        val = readl(&phy0_ctrl->phy_con0);
        val &= ~(PHY_CON0_CTRL_DDR_MODE_MASK << PHY_CON0_CTRL_DDR_MODE_SHIFT);
        val |= (DDR_MODE_DDR3 << PHY_CON0_CTRL_DDR_MODE_SHIFT);
        writel(val, &phy0_ctrl->phy_con0);

        val = readl(&phy1_ctrl->phy_con0);
        val &= ~(PHY_CON0_CTRL_DDR_MODE_MASK << PHY_CON0_CTRL_DDR_MODE_SHIFT);
        val |= (DDR_MODE_DDR3 << PHY_CON0_CTRL_DDR_MODE_SHIFT);
        writel(val, &phy1_ctrl->phy_con0);

        /* Set Read Latency and Burst Length for PHY0 and PHY1 */
        val = (mem->ctrl_bstlen << PHY_CON42_CTRL_BSTLEN_SHIFT) |
                (mem->ctrl_rdlat << PHY_CON42_CTRL_RDLAT_SHIFT);
        writel(val, &phy0_ctrl->phy_con42);
        writel(val, &phy1_ctrl->phy_con42);

        val = readl(&phy0_ctrl->phy_con26);
        val &= ~(T_WRDATA_EN_MASK << T_WRDATA_EN_OFFSET);
        val |= (T_WRDATA_EN_DDR3 << T_WRDATA_EN_OFFSET);
        writel(val, &phy0_ctrl->phy_con26);

        val = readl(&phy1_ctrl->phy_con26);
        val &= ~(T_WRDATA_EN_MASK << T_WRDATA_EN_OFFSET);
        val |= (T_WRDATA_EN_DDR3 << T_WRDATA_EN_OFFSET);
        writel(val, &phy1_ctrl->phy_con26);

        /*
         * Set Driver strength for CK, CKE, CS & CA to 0x7
         * Set Driver strength for Data Slice 0~3 to 0x7
         */
        val = (0x7 << CA_CK_DRVR_DS_OFFSET) | (0x7 << CA_CKE_DRVR_DS_OFFSET) |
                (0x7 << CA_CS_DRVR_DS_OFFSET) | (0x7 << CA_ADR_DRVR_DS_OFFSET);
        val |= (0x7 << DA_3_DS_OFFSET) | (0x7 << DA_2_DS_OFFSET) |
                (0x7 << DA_1_DS_OFFSET) | (0x7 << DA_0_DS_OFFSET);
        writel(val, &phy0_ctrl->phy_con39);
        writel(val, &phy1_ctrl->phy_con39);

        /* ZQ Calibration */
        if (dmc_config_zq(mem, &phy0_ctrl->phy_con16, &phy1_ctrl->phy_con16,
                          &phy0_ctrl->phy_con17, &phy1_ctrl->phy_con17))
                return SETUP_ERR_ZQ_CALIBRATION_FAILURE;

        clrbits_le32(&phy0_ctrl->phy_con16, ZQ_CLK_DIV_EN);
        clrbits_le32(&phy1_ctrl->phy_con16, ZQ_CLK_DIV_EN);

        /* DQ Signal */
        val = readl(&phy0_ctrl->phy_con14);
        val |= mem->phy0_pulld_dqs;
        writel(val, &phy0_ctrl->phy_con14);
        val = readl(&phy1_ctrl->phy_con14);
        val |= mem->phy1_pulld_dqs;
        writel(val, &phy1_ctrl->phy_con14);

        val = MEM_TERM_EN | PHY_TERM_EN;
        writel(val, &drex0->phycontrol0);
        writel(val, &drex1->phycontrol0);

        writel(mem->concontrol |
                (mem->dfi_init_start << CONCONTROL_DFI_INIT_START_SHIFT) |
                (mem->rd_fetch << CONCONTROL_RD_FETCH_SHIFT),
                &drex0->concontrol);
        writel(mem->concontrol |
                (mem->dfi_init_start << CONCONTROL_DFI_INIT_START_SHIFT) |
                (mem->rd_fetch << CONCONTROL_RD_FETCH_SHIFT),
                &drex1->concontrol);

        do {
                val = readl(&drex0->phystatus);
        } while ((val & DFI_INIT_COMPLETE) != DFI_INIT_COMPLETE);
        do {
                val = readl(&drex1->phystatus);
        } while ((val & DFI_INIT_COMPLETE) != DFI_INIT_COMPLETE);

        clrbits_le32(&drex0->concontrol, DFI_INIT_START);
        clrbits_le32(&drex1->concontrol, DFI_INIT_START);

        update_reset_dll(&drex0->phycontrol0, DDR_MODE_DDR3);
        update_reset_dll(&drex1->phycontrol0, DDR_MODE_DDR3);

        /*
         * Set Base Address:
         * 0x2000_0000 ~ 0x5FFF_FFFF
         * 0x6000_0000 ~ 0x9FFF_FFFF
         */
        /* MEMBASECONFIG0 */
        val = DMC_MEMBASECONFIGX_CHIP_BASE(DMC_CHIP_BASE_0) |
                DMC_MEMBASECONFIGX_CHIP_MASK(DMC_CHIP_MASK);
        writel(val, &tzasc0->membaseconfig0);
        writel(val, &tzasc1->membaseconfig0);

        /* MEMBASECONFIG1 */
        val = DMC_MEMBASECONFIGX_CHIP_BASE(DMC_CHIP_BASE_1) |
                DMC_MEMBASECONFIGX_CHIP_MASK(DMC_CHIP_MASK);
        writel(val, &tzasc0->membaseconfig1);
        writel(val, &tzasc1->membaseconfig1);

        /*
         * Memory Channel Inteleaving Size
         * Ares Channel interleaving = 128 bytes
         */
        /* MEMCONFIG0/1 */
        writel(mem->memconfig, &tzasc0->memconfig0);
        writel(mem->memconfig, &tzasc1->memconfig0);
        writel(mem->memconfig, &tzasc0->memconfig1);
        writel(mem->memconfig, &tzasc1->memconfig1);

        /* Precharge Configuration */
        writel(mem->prechconfig_tp_cnt << PRECHCONFIG_TP_CNT_SHIFT,
               &drex0->prechconfig0);
        writel(mem->prechconfig_tp_cnt << PRECHCONFIG_TP_CNT_SHIFT,
               &drex1->prechconfig0);

        /*
         * TimingRow, TimingData, TimingPower and Timingaref
         * values as per Memory AC parameters
         */
        writel(mem->timing_ref, &drex0->timingref);
        writel(mem->timing_ref, &drex1->timingref);
        writel(mem->timing_row, &drex0->timingrow0);
        writel(mem->timing_row, &drex1->timingrow0);
        writel(mem->timing_data, &drex0->timingdata0);
        writel(mem->timing_data, &drex1->timingdata0);
        writel(mem->timing_power, &drex0->timingpower0);
        writel(mem->timing_power, &drex1->timingpower0);

        if (reset) {
                /*
                 * Send NOP, MRS and ZQINIT commands
                 * Sending MRS command will reset the DRAM. We should not be
                 * reseting the DRAM after resume, this will lead to memory
                 * corruption as DRAM content is lost after DRAM reset
                 */
                dmc_config_mrs(mem, &drex0->directcmd);
                dmc_config_mrs(mem, &drex1->directcmd);
        }

        /*
         * Get PHY_CON13 from both phys.  Gate CLKM around reading since
         * PHY_CON13 is glitchy when CLKM is running.  We're paranoid and
         * wait until we get a "fine lock", though a coarse lock is probably
         * OK (we only use the coarse numbers below).  We try to gate the
         * clock for as short a time as possible in case SDRAM is somehow
         * sensitive.  sdelay(10) in the loop is arbitrary to make sure
         * there is some time for PHY_CON13 to get updated.  In practice
         * no delay appears to be needed.
         */
        val = readl(&clk->gate_bus_cdrex);
        while (true) {
                writel(val & ~0x1, &clk->gate_bus_cdrex);
                lock0_info = readl(&phy0_ctrl->phy_con13);
                writel(val, &clk->gate_bus_cdrex);

                if ((lock0_info & CTRL_FINE_LOCKED) == CTRL_FINE_LOCKED)
                        break;

                sdelay(10);
        }
        while (true) {
                writel(val & ~0x2, &clk->gate_bus_cdrex);
                lock1_info = readl(&phy1_ctrl->phy_con13);
                writel(val, &clk->gate_bus_cdrex);

                if ((lock1_info & CTRL_FINE_LOCKED) == CTRL_FINE_LOCKED)
                        break;

                sdelay(10);
        }

        if (!reset) {
                /*
                 * During Suspend-Resume & S/W-Reset, as soon as PMU releases
                 * pad retention, CKE goes high. This causes memory contents
                 * not to be retained during DRAM initialization. Therfore,
                 * there is a new control register(0x100431e8[28]) which lets us
                 * release pad retention and retain the memory content until the
                 * initialization is complete.
                 */
                writel(PAD_RETENTION_DRAM_COREBLK_VAL,
                       &power->pad_retention_dram_coreblk_option);
                do {
                        val = readl(&power->pad_retention_dram_status);
                } while (val != 0x1);

                /*
                 * CKE PAD retention disables DRAM self-refresh mode.
                 * Send auto refresh command for DRAM refresh.
                 */
                for (i = 0; i < 128; i++) {
                        for (chip = 0; chip < mem->chips_to_configure; chip++) {
                                writel(DIRECT_CMD_REFA |
                                       (chip << DIRECT_CMD_CHIP_SHIFT),
                                       &drex0->directcmd);
                                writel(DIRECT_CMD_REFA |
                                       (chip << DIRECT_CMD_CHIP_SHIFT),
                                       &drex1->directcmd);
                        }
                }
        }

        if (mem->gate_leveling_enable) {
                writel(PHY_CON0_RESET_VAL, &phy0_ctrl->phy_con0);
                writel(PHY_CON0_RESET_VAL, &phy1_ctrl->phy_con0);

                setbits_le32(&phy0_ctrl->phy_con0, P0_CMD_EN);
                setbits_le32(&phy1_ctrl->phy_con0, P0_CMD_EN);

                val = PHY_CON2_RESET_VAL;
                val |= INIT_DESKEW_EN;
                writel(val, &phy0_ctrl->phy_con2);
                writel(val, &phy1_ctrl->phy_con2);

                val =  readl(&phy0_ctrl->phy_con1);
                val |= (RDLVL_PASS_ADJ_VAL << RDLVL_PASS_ADJ_OFFSET);
                writel(val, &phy0_ctrl->phy_con1);

                val =  readl(&phy1_ctrl->phy_con1);
                val |= (RDLVL_PASS_ADJ_VAL << RDLVL_PASS_ADJ_OFFSET);
                writel(val, &phy1_ctrl->phy_con1);

                n_lock_w_phy0 = (lock0_info & CTRL_LOCK_COARSE_MASK) >> 2;
                n_lock_r = readl(&phy0_ctrl->phy_con12);
                n_lock_r &= ~CTRL_DLL_ON;
                n_lock_r |= n_lock_w_phy0;
                writel(n_lock_r, &phy0_ctrl->phy_con12);

                n_lock_w_phy1 = (lock1_info & CTRL_LOCK_COARSE_MASK) >> 2;
                n_lock_r = readl(&phy1_ctrl->phy_con12);
                n_lock_r &= ~CTRL_DLL_ON;
                n_lock_r |= n_lock_w_phy1;
                writel(n_lock_r, &phy1_ctrl->phy_con12);

                val = (0x3 << DIRECT_CMD_BANK_SHIFT) | 0x4;
                for (chip = 0; chip < mem->chips_to_configure; chip++) {
                        writel(val | (chip << DIRECT_CMD_CHIP_SHIFT),
                               &drex0->directcmd);
                        writel(val | (chip << DIRECT_CMD_CHIP_SHIFT),
                               &drex1->directcmd);
                }

                setbits_le32(&phy0_ctrl->phy_con2, RDLVL_GATE_EN);
                setbits_le32(&phy1_ctrl->phy_con2, RDLVL_GATE_EN);

                setbits_le32(&phy0_ctrl->phy_con0, CTRL_SHGATE);
                setbits_le32(&phy1_ctrl->phy_con0, CTRL_SHGATE);

                val = readl(&phy0_ctrl->phy_con1);
                val &= ~(CTRL_GATEDURADJ_MASK);
                writel(val, &phy0_ctrl->phy_con1);

                val = readl(&phy1_ctrl->phy_con1);
                val &= ~(CTRL_GATEDURADJ_MASK);
                writel(val, &phy1_ctrl->phy_con1);

                writel(CTRL_RDLVL_GATE_ENABLE, &drex0->rdlvl_config);
                i = TIMEOUT_US;
                while (((readl(&drex0->phystatus) & RDLVL_COMPLETE_CHO) !=
                        RDLVL_COMPLETE_CHO) && (i > 0)) {
                        /*
                         * TODO(waihong): Comment on how long this take to
                         * timeout
                         */
                        sdelay(100);
                        i--;
                }
                if (!i)
                        return SETUP_ERR_RDLV_COMPLETE_TIMEOUT;
                writel(CTRL_RDLVL_GATE_DISABLE, &drex0->rdlvl_config);

                writel(CTRL_RDLVL_GATE_ENABLE, &drex1->rdlvl_config);
                i = TIMEOUT_US;
                while (((readl(&drex1->phystatus) & RDLVL_COMPLETE_CHO) !=
                        RDLVL_COMPLETE_CHO) && (i > 0)) {
                        /*
                         * TODO(waihong): Comment on how long this take to
                         * timeout
                         */
                        sdelay(100);
                        i--;
                }
                if (!i)
                        return SETUP_ERR_RDLV_COMPLETE_TIMEOUT;
                writel(CTRL_RDLVL_GATE_DISABLE, &drex1->rdlvl_config);

                writel(0, &phy0_ctrl->phy_con14);
                writel(0, &phy1_ctrl->phy_con14);

                val = (0x3 << DIRECT_CMD_BANK_SHIFT);
                for (chip = 0; chip < mem->chips_to_configure; chip++) {
                        writel(val | (chip << DIRECT_CMD_CHIP_SHIFT),
                               &drex0->directcmd);
                        writel(val | (chip << DIRECT_CMD_CHIP_SHIFT),
                               &drex1->directcmd);
                }

                /* Common Settings for Leveling */
                val = PHY_CON12_RESET_VAL;
                writel((val + n_lock_w_phy0), &phy0_ctrl->phy_con12);
                writel((val + n_lock_w_phy1), &phy1_ctrl->phy_con12);

                setbits_le32(&phy0_ctrl->phy_con2, DLL_DESKEW_EN);
                setbits_le32(&phy1_ctrl->phy_con2, DLL_DESKEW_EN);
        }

        /*
         * Do software read leveling
         *
         * Do this before we turn on auto refresh since the auto refresh can
         * be in conflict with the resync operation that's part of setting
         * read leveling.
         */
        if (!reset) {
                /* restore calibrated value after resume */
                dmc_set_read_offset_value(phy0_ctrl, readl(&pmu->pmu_spare1));
                dmc_set_read_offset_value(phy1_ctrl, readl(&pmu->pmu_spare2));
        } else {
                software_find_read_offset(phy0_ctrl, 0,
                                          CTRL_LOCK_COARSE(lock0_info));
                software_find_read_offset(phy1_ctrl, 1,
                                          CTRL_LOCK_COARSE(lock1_info));
                /* save calibrated value to restore after resume */
                writel(dmc_get_read_offset_value(phy0_ctrl), &pmu->pmu_spare1);
                writel(dmc_get_read_offset_value(phy1_ctrl), &pmu->pmu_spare2);
        }

        /* Send PALL command */
        dmc_config_prech(mem, &drex0->directcmd);
        dmc_config_prech(mem, &drex1->directcmd);

        writel(mem->memcontrol, &drex0->memcontrol);
        writel(mem->memcontrol, &drex1->memcontrol);

        /*
         * Set DMC Concontrol: Enable auto-refresh counter, provide
         * read data fetch cycles and enable DREX auto set powerdown
         * for input buffer of I/O in none read memory state.
         */
        writel(mem->concontrol | (mem->aref_en << CONCONTROL_AREF_EN_SHIFT) |
                (mem->rd_fetch << CONCONTROL_RD_FETCH_SHIFT)|
                DMC_CONCONTROL_IO_PD_CON(0x2),
                &drex0->concontrol);
        writel(mem->concontrol | (mem->aref_en << CONCONTROL_AREF_EN_SHIFT) |
                (mem->rd_fetch << CONCONTROL_RD_FETCH_SHIFT)|
                DMC_CONCONTROL_IO_PD_CON(0x2),
                &drex1->concontrol);

        /*
         * Enable Clock Gating Control for DMC
         * this saves around 25 mw dmc power as compared to the power
         * consumption without these bits enabled
         */
        setbits_le32(&drex0->cgcontrol, DMC_INTERNAL_CG);
        setbits_le32(&drex1->cgcontrol, DMC_INTERNAL_CG);

        /*
         * As per Exynos5800 UM ver 0.00 section 17.13.2.1
         * CONCONTROL register bit 3 [update_mode], Exynos5800 does not
         * support the PHY initiated update. And it is recommended to set
         * this field to 1'b1 during initialization
         *
         * When we apply PHY-initiated mode, DLL lock value is determined
         * once at DMC init time and not updated later when we change the MIF
         * voltage based on ASV group in kernel. Applying MC-initiated mode
         * makes sure that DLL tracing is ON so that silicon is able to
         * compensate the voltage variation.
         */
        val = readl(&drex0->concontrol);
        val |= CONCONTROL_UPDATE_MODE;
        writel(val, &drex0->concontrol);
        val = readl(&drex1->concontrol);
        val |= CONCONTROL_UPDATE_MODE;
        writel(val, &drex1->concontrol);

        return 0;
}
#endif