arch/arm/cpu/armv7/mx6/ddr.c - github/trini/u-boot - Gitiles

 /*
  * Copyright (C) 2014 Gateworks Corporation
  * Author: Tim Harvey <tharvey@gateworks.com>
  *
  * SPDX-License-Identifier:     GPL-2.0+
  */

 #include <common.h>
 #include <linux/types.h>
 #include <asm/arch/mx6-ddr.h>
 #include <asm/arch/sys_proto.h>
 #include <asm/io.h>
 #include <asm/types.h>

 #if defined(CONFIG_MX6QDL) || defined(CONFIG_MX6Q) || defined(CONFIG_MX6D)
 /* Configure MX6DQ mmdc iomux */
 void mx6dq_dram_iocfg(unsigned width,
 		      const struct mx6dq_iomux_ddr_regs *ddr,
 		      const struct mx6dq_iomux_grp_regs *grp)
 {
 	volatile struct mx6dq_iomux_ddr_regs *mx6_ddr_iomux;
 	volatile struct mx6dq_iomux_grp_regs *mx6_grp_iomux;

 	mx6_ddr_iomux = (struct mx6dq_iomux_ddr_regs *)MX6DQ_IOM_DDR_BASE;
 	mx6_grp_iomux = (struct mx6dq_iomux_grp_regs *)MX6DQ_IOM_GRP_BASE;

 	/* DDR IO Type */
 	mx6_grp_iomux->grp_ddr_type = grp->grp_ddr_type;
 	mx6_grp_iomux->grp_ddrpke = grp->grp_ddrpke;

 	/* Clock */
 	mx6_ddr_iomux->dram_sdclk_0 = ddr->dram_sdclk_0;
 	mx6_ddr_iomux->dram_sdclk_1 = ddr->dram_sdclk_1;

 	/* Address */
 	mx6_ddr_iomux->dram_cas = ddr->dram_cas;
 	mx6_ddr_iomux->dram_ras = ddr->dram_ras;
 	mx6_grp_iomux->grp_addds = grp->grp_addds;

 	/* Control */
 	mx6_ddr_iomux->dram_reset = ddr->dram_reset;
 	mx6_ddr_iomux->dram_sdcke0 = ddr->dram_sdcke0;
 	mx6_ddr_iomux->dram_sdcke1 = ddr->dram_sdcke1;
 	mx6_ddr_iomux->dram_sdba2 = ddr->dram_sdba2;
 	mx6_ddr_iomux->dram_sdodt0 = ddr->dram_sdodt0;
 	mx6_ddr_iomux->dram_sdodt1 = ddr->dram_sdodt1;
 	mx6_grp_iomux->grp_ctlds = grp->grp_ctlds;

 	/* Data Strobes */
 	mx6_grp_iomux->grp_ddrmode_ctl = grp->grp_ddrmode_ctl;
 	mx6_ddr_iomux->dram_sdqs0 = ddr->dram_sdqs0;
 	mx6_ddr_iomux->dram_sdqs1 = ddr->dram_sdqs1;
 	if (width >= 32) {
 		mx6_ddr_iomux->dram_sdqs2 = ddr->dram_sdqs2;
 		mx6_ddr_iomux->dram_sdqs3 = ddr->dram_sdqs3;
 	}
 	if (width >= 64) {
 		mx6_ddr_iomux->dram_sdqs4 = ddr->dram_sdqs4;
 		mx6_ddr_iomux->dram_sdqs5 = ddr->dram_sdqs5;
 		mx6_ddr_iomux->dram_sdqs6 = ddr->dram_sdqs6;
 		mx6_ddr_iomux->dram_sdqs7 = ddr->dram_sdqs7;
 	}

 	/* Data */
 	mx6_grp_iomux->grp_ddrmode = grp->grp_ddrmode;
 	mx6_grp_iomux->grp_b0ds = grp->grp_b0ds;
 	mx6_grp_iomux->grp_b1ds = grp->grp_b1ds;
 	if (width >= 32) {
 		mx6_grp_iomux->grp_b2ds = grp->grp_b2ds;
 		mx6_grp_iomux->grp_b3ds = grp->grp_b3ds;
 	}
 	if (width >= 64) {
 		mx6_grp_iomux->grp_b4ds = grp->grp_b4ds;
 		mx6_grp_iomux->grp_b5ds = grp->grp_b5ds;
 		mx6_grp_iomux->grp_b6ds = grp->grp_b6ds;
 		mx6_grp_iomux->grp_b7ds = grp->grp_b7ds;
 	}
 	mx6_ddr_iomux->dram_dqm0 = ddr->dram_dqm0;
 	mx6_ddr_iomux->dram_dqm1 = ddr->dram_dqm1;
 	if (width >= 32) {
 		mx6_ddr_iomux->dram_dqm2 = ddr->dram_dqm2;
 		mx6_ddr_iomux->dram_dqm3 = ddr->dram_dqm3;
 	}
 	if (width >= 64) {
 		mx6_ddr_iomux->dram_dqm4 = ddr->dram_dqm4;
 		mx6_ddr_iomux->dram_dqm5 = ddr->dram_dqm5;
 		mx6_ddr_iomux->dram_dqm6 = ddr->dram_dqm6;
 		mx6_ddr_iomux->dram_dqm7 = ddr->dram_dqm7;
 	}
 }
 #endif

 #if defined(CONFIG_MX6QDL) || defined(CONFIG_MX6DL) || defined(CONFIG_MX6S)
 /* Configure MX6SDL mmdc iomux */
 void mx6sdl_dram_iocfg(unsigned width,
 		       const struct mx6sdl_iomux_ddr_regs *ddr,
 		       const struct mx6sdl_iomux_grp_regs *grp)
 {
 	volatile struct mx6sdl_iomux_ddr_regs *mx6_ddr_iomux;
 	volatile struct mx6sdl_iomux_grp_regs *mx6_grp_iomux;

 	mx6_ddr_iomux = (struct mx6sdl_iomux_ddr_regs *)MX6SDL_IOM_DDR_BASE;
 	mx6_grp_iomux = (struct mx6sdl_iomux_grp_regs *)MX6SDL_IOM_GRP_BASE;

 	/* DDR IO Type */
 	mx6_grp_iomux->grp_ddr_type = grp->grp_ddr_type;
 	mx6_grp_iomux->grp_ddrpke = grp->grp_ddrpke;

 	/* Clock */
 	mx6_ddr_iomux->dram_sdclk_0 = ddr->dram_sdclk_0;
 	mx6_ddr_iomux->dram_sdclk_1 = ddr->dram_sdclk_1;

 	/* Address */
 	mx6_ddr_iomux->dram_cas = ddr->dram_cas;
 	mx6_ddr_iomux->dram_ras = ddr->dram_ras;
 	mx6_grp_iomux->grp_addds = grp->grp_addds;

 	/* Control */
 	mx6_ddr_iomux->dram_reset = ddr->dram_reset;
 	mx6_ddr_iomux->dram_sdcke0 = ddr->dram_sdcke0;
 	mx6_ddr_iomux->dram_sdcke1 = ddr->dram_sdcke1;
 	mx6_ddr_iomux->dram_sdba2 = ddr->dram_sdba2;
 	mx6_ddr_iomux->dram_sdodt0 = ddr->dram_sdodt0;
 	mx6_ddr_iomux->dram_sdodt1 = ddr->dram_sdodt1;
 	mx6_grp_iomux->grp_ctlds = grp->grp_ctlds;

 	/* Data Strobes */
 	mx6_grp_iomux->grp_ddrmode_ctl = grp->grp_ddrmode_ctl;
 	mx6_ddr_iomux->dram_sdqs0 = ddr->dram_sdqs0;
 	mx6_ddr_iomux->dram_sdqs1 = ddr->dram_sdqs1;
 	if (width >= 32) {
 		mx6_ddr_iomux->dram_sdqs2 = ddr->dram_sdqs2;
 		mx6_ddr_iomux->dram_sdqs3 = ddr->dram_sdqs3;
 	}
 	if (width >= 64) {
 		mx6_ddr_iomux->dram_sdqs4 = ddr->dram_sdqs4;
 		mx6_ddr_iomux->dram_sdqs5 = ddr->dram_sdqs5;
 		mx6_ddr_iomux->dram_sdqs6 = ddr->dram_sdqs6;
 		mx6_ddr_iomux->dram_sdqs7 = ddr->dram_sdqs7;
 	}

 	/* Data */
 	mx6_grp_iomux->grp_ddrmode = grp->grp_ddrmode;
 	mx6_grp_iomux->grp_b0ds = grp->grp_b0ds;
 	mx6_grp_iomux->grp_b1ds = grp->grp_b1ds;
 	if (width >= 32) {
 		mx6_grp_iomux->grp_b2ds = grp->grp_b2ds;
 		mx6_grp_iomux->grp_b3ds = grp->grp_b3ds;
 	}
 	if (width >= 64) {
 		mx6_grp_iomux->grp_b4ds = grp->grp_b4ds;
 		mx6_grp_iomux->grp_b5ds = grp->grp_b5ds;
 		mx6_grp_iomux->grp_b6ds = grp->grp_b6ds;
 		mx6_grp_iomux->grp_b7ds = grp->grp_b7ds;
 	}
 	mx6_ddr_iomux->dram_dqm0 = ddr->dram_dqm0;
 	mx6_ddr_iomux->dram_dqm1 = ddr->dram_dqm1;
 	if (width >= 32) {
 		mx6_ddr_iomux->dram_dqm2 = ddr->dram_dqm2;
 		mx6_ddr_iomux->dram_dqm3 = ddr->dram_dqm3;
 	}
 	if (width >= 64) {
 		mx6_ddr_iomux->dram_dqm4 = ddr->dram_dqm4;
 		mx6_ddr_iomux->dram_dqm5 = ddr->dram_dqm5;
 		mx6_ddr_iomux->dram_dqm6 = ddr->dram_dqm6;
 		mx6_ddr_iomux->dram_dqm7 = ddr->dram_dqm7;
 	}
 }
 #endif

 /*
  * Configure mx6 mmdc registers based on:
  *  - board-specific memory configuration
  *  - board-specific calibration data
  *  - ddr3 chip details
  *
  * The various calculations here are derived from the Freescale
  * i.Mx6DQSDL DDR3 Script Aid spreadsheet (DOC-94917) designed to generate MMDC
  * configuration registers based on memory system and memory chip parameters.
  *
  * The defaults here are those which were specified in the spreadsheet.
  * For details on each register, refer to the IMX6DQRM and/or IMX6SDLRM
  * section titled MMDC initialization
  */
 #define MR(val, ba, cmd, cs1) \
 	((val << 16) | (1 << 15) | (cmd << 4) | (cs1 << 3) | ba)
 void mx6_dram_cfg(const struct mx6_ddr_sysinfo *i,
 		  const struct mx6_mmdc_calibration *c,
 		  const struct mx6_ddr3_cfg *m)
 {
 	volatile struct mmdc_p_regs *mmdc0;
 	volatile struct mmdc_p_regs *mmdc1;
 	u32 reg;
 	u8 tcke, tcksrx, tcksre, txpdll, taofpd, taonpd, trrd;
 	u8 todtlon, taxpd, tanpd, tcwl, txp, tfaw, tcl;
 	u8 todt_idle_off = 0x4; /* from DDR3 Script Aid spreadsheet */
 	u16 trcd, trc, tras, twr, tmrd, trtp, trp, twtr, trfc, txs, txpr;
 	u16 CS0_END;
 	u16 tdllk = 0x1ff; /* DLL locking time: 512 cycles (JEDEC DDR3) */
 	int clkper; /* clock period in picoseconds */
 	int clock; /* clock freq in mHz */
 	int cs;

 	mmdc0 = (struct mmdc_p_regs *)MMDC_P0_BASE_ADDR;
 	mmdc1 = (struct mmdc_p_regs *)MMDC_P1_BASE_ADDR;

 	/* MX6D/MX6Q: 1066 MHz memory clock, clkper = 1.894ns = 1894ps */
 	if (is_cpu_type(MXC_CPU_MX6Q) || is_cpu_type(MXC_CPU_MX6D)) {
 		clock = 528;
 		tcwl = 4;
 	}
 	/* MX6S/MX6DL: 800 MHz memory clock, clkper = 2.5ns = 2500ps */
 	else {
 		clock = 400;
 		tcwl = 3;
 	}
 	clkper = (1000*1000)/clock; /* ps */
 	todtlon = tcwl;
 	taxpd = tcwl;
 	tanpd = tcwl;
 	tcwl = tcwl;

 	switch (m->density) {
 	case 1: /* 1Gb per chip */
 		trfc = DIV_ROUND_UP(110000, clkper) - 1;
 		txs = DIV_ROUND_UP(120000, clkper) - 1;
 		break;
 	case 2: /* 2Gb per chip */
 		trfc = DIV_ROUND_UP(160000, clkper) - 1;
 		txs = DIV_ROUND_UP(170000, clkper) - 1;
 		break;
 	case 4: /* 4Gb per chip */
 		trfc = DIV_ROUND_UP(260000, clkper) - 1;
 		txs = DIV_ROUND_UP(270000, clkper) - 1;
 		break;
 	case 8: /* 8Gb per chip */
 		trfc = DIV_ROUND_UP(350000, clkper) - 1;
 		txs = DIV_ROUND_UP(360000, clkper) - 1;
 		break;
 	default:
 		/* invalid density */
 		printf("invalid chip density\n");
 		hang();
 		break;
 	}
 	txpr = txs;

 	switch (m->mem_speed) {
 	case 800:
 		txp = DIV_ROUND_UP(MAX(3*clkper, 7500), clkper) - 1;
 		tcke = DIV_ROUND_UP(MAX(3*clkper, 7500), clkper) - 1;
 		if (m->pagesz == 1) {
 			tfaw = DIV_ROUND_UP(40000, clkper) - 1;
 			trrd = DIV_ROUND_UP(MAX(4*clkper, 10000), clkper) - 1;
 		} else {
 			tfaw = DIV_ROUND_UP(50000, clkper) - 1;
 			trrd = DIV_ROUND_UP(MAX(4*clkper, 10000), clkper) - 1;
 		}
 		break;
 	case 1066:
 		txp = DIV_ROUND_UP(MAX(3*clkper, 7500), clkper) - 1;
 		tcke = DIV_ROUND_UP(MAX(3*clkper, 5625), clkper) - 1;
 		if (m->pagesz == 1) {
 			tfaw = DIV_ROUND_UP(37500, clkper) - 1;
 			trrd = DIV_ROUND_UP(MAX(4*clkper, 7500), clkper) - 1;
 		} else {
 			tfaw = DIV_ROUND_UP(50000, clkper) - 1;
 			trrd = DIV_ROUND_UP(MAX(4*clkper, 10000), clkper) - 1;
 		}
 		break;
 	case 1333:
 		txp = DIV_ROUND_UP(MAX(3*clkper, 6000), clkper) - 1;
 		tcke = DIV_ROUND_UP(MAX(3*clkper, 5625), clkper) - 1;
 		if (m->pagesz == 1) {
 			tfaw = DIV_ROUND_UP(30000, clkper) - 1;
 			trrd = DIV_ROUND_UP(MAX(4*clkper, 6000), clkper) - 1;
 		} else {
 			tfaw = DIV_ROUND_UP(45000, clkper) - 1;
 			trrd = DIV_ROUND_UP(MAX(4*clkper, 7500), clkper) - 1;
 		}
 		break;
 	case 1600:
 		txp = DIV_ROUND_UP(MAX(3*clkper, 6000), clkper) - 1;
 		tcke = DIV_ROUND_UP(MAX(3*clkper, 5000), clkper) - 1;
 		if (m->pagesz == 1) {
 			tfaw = DIV_ROUND_UP(30000, clkper) - 1;
 			trrd = DIV_ROUND_UP(MAX(4*clkper, 6000), clkper) - 1;
 		} else {
 			tfaw = DIV_ROUND_UP(40000, clkper) - 1;
 			trrd = DIV_ROUND_UP(MAX(4*clkper, 7500), clkper) - 1;
 		}
 		break;
 	default:
 		printf("invalid memory speed\n");
 		hang();
 		break;
 	}
 	txpdll = DIV_ROUND_UP(MAX(10*clkper, 24000), clkper) - 1;
 	tcl = DIV_ROUND_UP(m->trcd, clkper/10) - 3;
 	tcksre = DIV_ROUND_UP(MAX(5*clkper, 10000), clkper);
 	tcksrx = tcksre;
 	taonpd = DIV_ROUND_UP(2000, clkper) - 1;
 	taofpd = taonpd;
 	trp = DIV_ROUND_UP(m->trcd, clkper/10) - 1;
 	trcd = trp;
 	trc = DIV_ROUND_UP(m->trcmin, clkper/10) - 1;
 	tras = DIV_ROUND_UP(m->trasmin, clkper/10) - 1;
 	twr = DIV_ROUND_UP(15000, clkper) - 1;
 	tmrd = DIV_ROUND_UP(MAX(12*clkper, 15000), clkper) - 1;
 	twtr = ROUND(MAX(4*clkper, 7500)/clkper, 1) - 1;
 	trtp = twtr;
 	CS0_END = ((4*i->cs_density) <= 120) ? (4*i->cs_density)+7 : 127;
 	debug("density:%d Gb (%d Gb per chip)\n", i->cs_density, m->density);
 	debug("clock: %dMHz (%d ps)\n", clock, clkper);
 	debug("memspd:%d\n", m->mem_speed);
 	debug("tcke=%d\n", tcke);
 	debug("tcksrx=%d\n", tcksrx);
 	debug("tcksre=%d\n", tcksre);
 	debug("taofpd=%d\n", taofpd);
 	debug("taonpd=%d\n", taonpd);
 	debug("todtlon=%d\n", todtlon);
 	debug("tanpd=%d\n", tanpd);
 	debug("taxpd=%d\n", taxpd);
 	debug("trfc=%d\n", trfc);
 	debug("txs=%d\n", txs);
 	debug("txp=%d\n", txp);
 	debug("txpdll=%d\n", txpdll);
 	debug("tfaw=%d\n", tfaw);
 	debug("tcl=%d\n", tcl);
 	debug("trcd=%d\n", trcd);
 	debug("trp=%d\n", trp);
 	debug("trc=%d\n", trc);
 	debug("tras=%d\n", tras);
 	debug("twr=%d\n", twr);
 	debug("tmrd=%d\n", tmrd);
 	debug("tcwl=%d\n", tcwl);
 	debug("tdllk=%d\n", tdllk);
 	debug("trtp=%d\n", trtp);
 	debug("twtr=%d\n", twtr);
 	debug("trrd=%d\n", trrd);
 	debug("txpr=%d\n", txpr);
 	debug("CS0_END=%d\n", CS0_END);
 	debug("ncs=%d\n", i->ncs);
 	debug("Rtt_wr=%d\n", i->rtt_wr);
 	debug("Rtt_nom=%d\n", i->rtt_nom);
 	debug("SRT=%d\n", m->SRT);
 	debug("tcl=%d\n", tcl);
 	debug("twr=%d\n", twr);

 	/*
 	 * board-specific configuration:
 	 *  These values are determined empirically and vary per board layout
 	 *  see:
 	 *   appnote, ddr3 spreadsheet
 	 */
 	mmdc0->mpwldectrl0 = c->p0_mpwldectrl0;
 	mmdc0->mpwldectrl1 = c->p0_mpwldectrl1;
 	mmdc0->mpdgctrl0 = c->p0_mpdgctrl0;
 	mmdc0->mpdgctrl1 = c->p0_mpdgctrl1;
 	mmdc0->mprddlctl = c->p0_mprddlctl;
 	mmdc0->mpwrdlctl = c->p0_mpwrdlctl;
 	if (i->dsize > 1) {
 		mmdc1->mpwldectrl0 = c->p1_mpwldectrl0;
 		mmdc1->mpwldectrl1 = c->p1_mpwldectrl1;
 		mmdc1->mpdgctrl0 = c->p1_mpdgctrl0;
 		mmdc1->mpdgctrl1 = c->p1_mpdgctrl1;
 		mmdc1->mprddlctl = c->p1_mprddlctl;
 		mmdc1->mpwrdlctl = c->p1_mpwrdlctl;
 	}

 	/* Read data DQ Byte0-3 delay */
 	mmdc0->mprddqby0dl = (u32)0x33333333;
 	mmdc0->mprddqby1dl = (u32)0x33333333;
 	if (i->dsize > 0) {
 		mmdc0->mprddqby2dl = (u32)0x33333333;
 		mmdc0->mprddqby3dl = (u32)0x33333333;
 	}
 	if (i->dsize > 1) {
 		mmdc1->mprddqby0dl = (u32)0x33333333;
 		mmdc1->mprddqby1dl = (u32)0x33333333;
 		mmdc1->mprddqby2dl = (u32)0x33333333;
 		mmdc1->mprddqby3dl = (u32)0x33333333;
 	}

 	/* MMDC Termination: rtt_nom:2 RZQ/2(120ohm), rtt_nom:1 RZQ/4(60ohm) */
 	reg = (i->rtt_nom == 2) ? 0x00011117 : 0x00022227;
 	mmdc0->mpodtctrl = reg;
 	if (i->dsize > 1)
 		mmdc1->mpodtctrl = reg;

 	/* complete calibration */
 	reg = (1 << 11); /* Force measurement on delay-lines */
 	mmdc0->mpmur0 = reg;
 	if (i->dsize > 1)
 		mmdc1->mpmur0 = reg;

 	/* Step 1: configuration request */
 	mmdc0->mdscr = (u32)(1 << 15); /* config request */

 	/* Step 2: Timing configuration */
 	reg = (trfc << 24) | (txs << 16) | (txp << 13) | (txpdll << 9) |
 	      (tfaw << 4) | tcl;
 	mmdc0->mdcfg0 = reg;
 	reg = (trcd << 29) | (trp << 26) | (trc << 21) | (tras << 16) |
 	      (1 << 15) |		/* trpa */
 	      (twr << 9) | (tmrd << 5) | tcwl;
 	mmdc0->mdcfg1 = reg;
 	reg = (tdllk << 16) | (trtp << 6) | (twtr << 3) | trrd;
 	mmdc0->mdcfg2 = reg;
 	reg = (taofpd << 27) | (taonpd << 24) | (tanpd << 20) | (taxpd << 16) |
 	      (todtlon << 12) | (todt_idle_off << 4);
 	mmdc0->mdotc = reg;
 	mmdc0->mdasp = CS0_END; /* CS addressing */

 	/* Step 3: Configure DDR type */
 	reg = (i->cs1_mirror << 19) | (i->walat << 16) | (i->bi_on << 12) |
 	      (i->mif3_mode << 9) | (i->ralat << 6);
 	mmdc0->mdmisc = reg;

 	/* Step 4: Configure delay while leaving reset */
 	reg = (txpr << 16) | (i->sde_to_rst << 8) | (i->rst_to_cke << 0);
 	mmdc0->mdor = reg;

 	/* Step 5: Configure DDR physical parameters (density and burst len) */
 	reg = (m->rowaddr - 11) << 24 |		/* ROW */
 	      (m->coladdr - 9) << 20 |		/* COL */
 	      (1 << 19) |			/* Burst Length = 8 for DDR3 */
 	      (i->dsize << 16);			/* DDR data bus size */
 	mmdc0->mdctl = reg;

 	/* Step 6: Perform ZQ calibration */
 	reg = (u32)0xa1390001; /* one-time HW ZQ calib */
 	mmdc0->mpzqhwctrl = reg;
 	if (i->dsize > 1)
 		mmdc1->mpzqhwctrl = reg;

 	/* Step 7: Enable MMDC with desired chip select */
 	reg = mmdc0->mdctl |
 	      (1 << 31) |			/* SDE_0 for CS0 */
 	      ((i->ncs == 2) ? 1 : 0) << 30;	/* SDE_1 for CS1 */
 	mmdc0->mdctl = reg;

 	/* Step 8: Write Mode Registers to Init DDR3 devices */
 	for (cs = 0; cs < i->ncs; cs++) {
 		/* MR2 */
 		reg = (i->rtt_wr & 3) << 9 | (m->SRT & 1) << 7 |
 		      ((tcwl - 3) & 3) << 3;
 		mmdc0->mdscr = (u32)MR(reg, 2, 3, cs);
 		/* MR3 */
 		mmdc0->mdscr = (u32)MR(0, 3, 3, cs);
 		/* MR1 */
 		reg = ((i->rtt_nom & 1) ? 1 : 0) << 2 |
 		      ((i->rtt_nom & 2) ? 1 : 0) << 6;
 		mmdc0->mdscr = (u32)MR(reg, 1, 3, cs);
 		reg = ((tcl - 1) << 4) |	/* CAS */
 		      (1 << 8)   |		/* DLL Reset */
 		      ((twr - 3) << 9);		/* Write Recovery */
 		/* MR0 */
 		mmdc0->mdscr = (u32)MR(reg, 0, 3, cs);
 		/* ZQ calibration */
 		reg = (1 << 10);
 		mmdc0->mdscr = (u32)MR(reg, 0, 4, cs);
 	}

 	/* Step 10: Power down control and self-refresh */
 	reg = (tcke & 0x7) << 16 |
 	      5            << 12 |  /* PWDT_1: 256 cycles */
 	      5            <<  8 |  /* PWDT_0: 256 cycles */
 	      1            <<  6 |  /* BOTH_CS_PD */
 	      (tcksrx & 0x7) << 3 |
 	      (tcksre & 0x7);
 	mmdc0->mdpdc = reg;
 	mmdc0->mapsr = (u32)0x00011006; /* ADOPT power down enabled */

 	/* Step 11: Configure ZQ calibration: one-time and periodic 1ms */
 	mmdc0->mpzqhwctrl = (u32)0xa1390003;
 	if (i->dsize > 1)
 		mmdc1->mpzqhwctrl = (u32)0xa1390003;

 	/* Step 12: Configure and activate periodic refresh */
 	reg = (1 << 14) |	/* REF_SEL: Periodic refresh cycles of 32kHz */
 	      (7 << 11);	/* REFR: Refresh Rate - 8 refreshes */
 	mmdc0->mdref = reg;

 	/* Step 13: Deassert config request - init complete */
 	mmdc0->mdscr = (u32)0x00000000;

 	/* wait for auto-ZQ calibration to complete */
 	mdelay(1);
 }
	/*
	* Copyright (C) 2014 Gateworks Corporation
	* Author: Tim Harvey <tharvey@gateworks.com>
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/

	#include <common.h>
	#include <linux/types.h>
	#include <asm/arch/mx6-ddr.h>
	#include <asm/arch/sys_proto.h>
	#include <asm/io.h>
	#include <asm/types.h>

	#if defined(CONFIG_MX6QDL) \|\| defined(CONFIG_MX6Q) \|\| defined(CONFIG_MX6D)
	/* Configure MX6DQ mmdc iomux */
	void mx6dq_dram_iocfg(unsigned width,
	const struct mx6dq_iomux_ddr_regs *ddr,
	const struct mx6dq_iomux_grp_regs *grp)
	{
	volatile struct mx6dq_iomux_ddr_regs *mx6_ddr_iomux;
	volatile struct mx6dq_iomux_grp_regs *mx6_grp_iomux;

	mx6_ddr_iomux = (struct mx6dq_iomux_ddr_regs *)MX6DQ_IOM_DDR_BASE;
	mx6_grp_iomux = (struct mx6dq_iomux_grp_regs *)MX6DQ_IOM_GRP_BASE;

	/* DDR IO Type */
	mx6_grp_iomux->grp_ddr_type = grp->grp_ddr_type;
	mx6_grp_iomux->grp_ddrpke = grp->grp_ddrpke;

	/* Clock */
	mx6_ddr_iomux->dram_sdclk_0 = ddr->dram_sdclk_0;
	mx6_ddr_iomux->dram_sdclk_1 = ddr->dram_sdclk_1;

	/* Address */
	mx6_ddr_iomux->dram_cas = ddr->dram_cas;
	mx6_ddr_iomux->dram_ras = ddr->dram_ras;
	mx6_grp_iomux->grp_addds = grp->grp_addds;

	/* Control */
	mx6_ddr_iomux->dram_reset = ddr->dram_reset;
	mx6_ddr_iomux->dram_sdcke0 = ddr->dram_sdcke0;
	mx6_ddr_iomux->dram_sdcke1 = ddr->dram_sdcke1;
	mx6_ddr_iomux->dram_sdba2 = ddr->dram_sdba2;
	mx6_ddr_iomux->dram_sdodt0 = ddr->dram_sdodt0;
	mx6_ddr_iomux->dram_sdodt1 = ddr->dram_sdodt1;
	mx6_grp_iomux->grp_ctlds = grp->grp_ctlds;

	/* Data Strobes */
	mx6_grp_iomux->grp_ddrmode_ctl = grp->grp_ddrmode_ctl;
	mx6_ddr_iomux->dram_sdqs0 = ddr->dram_sdqs0;
	mx6_ddr_iomux->dram_sdqs1 = ddr->dram_sdqs1;
	if (width >= 32) {
	mx6_ddr_iomux->dram_sdqs2 = ddr->dram_sdqs2;
	mx6_ddr_iomux->dram_sdqs3 = ddr->dram_sdqs3;
	}
	if (width >= 64) {
	mx6_ddr_iomux->dram_sdqs4 = ddr->dram_sdqs4;
	mx6_ddr_iomux->dram_sdqs5 = ddr->dram_sdqs5;
	mx6_ddr_iomux->dram_sdqs6 = ddr->dram_sdqs6;
	mx6_ddr_iomux->dram_sdqs7 = ddr->dram_sdqs7;
	}

	/* Data */
	mx6_grp_iomux->grp_ddrmode = grp->grp_ddrmode;
	mx6_grp_iomux->grp_b0ds = grp->grp_b0ds;
	mx6_grp_iomux->grp_b1ds = grp->grp_b1ds;
	if (width >= 32) {
	mx6_grp_iomux->grp_b2ds = grp->grp_b2ds;
	mx6_grp_iomux->grp_b3ds = grp->grp_b3ds;
	}
	if (width >= 64) {
	mx6_grp_iomux->grp_b4ds = grp->grp_b4ds;
	mx6_grp_iomux->grp_b5ds = grp->grp_b5ds;
	mx6_grp_iomux->grp_b6ds = grp->grp_b6ds;
	mx6_grp_iomux->grp_b7ds = grp->grp_b7ds;
	}
	mx6_ddr_iomux->dram_dqm0 = ddr->dram_dqm0;
	mx6_ddr_iomux->dram_dqm1 = ddr->dram_dqm1;
	if (width >= 32) {
	mx6_ddr_iomux->dram_dqm2 = ddr->dram_dqm2;
	mx6_ddr_iomux->dram_dqm3 = ddr->dram_dqm3;
	}
	if (width >= 64) {
	mx6_ddr_iomux->dram_dqm4 = ddr->dram_dqm4;
	mx6_ddr_iomux->dram_dqm5 = ddr->dram_dqm5;
	mx6_ddr_iomux->dram_dqm6 = ddr->dram_dqm6;
	mx6_ddr_iomux->dram_dqm7 = ddr->dram_dqm7;
	}
	}
	#endif

	#if defined(CONFIG_MX6QDL) \|\| defined(CONFIG_MX6DL) \|\| defined(CONFIG_MX6S)
	/* Configure MX6SDL mmdc iomux */
	void mx6sdl_dram_iocfg(unsigned width,
	const struct mx6sdl_iomux_ddr_regs *ddr,
	const struct mx6sdl_iomux_grp_regs *grp)
	{
	volatile struct mx6sdl_iomux_ddr_regs *mx6_ddr_iomux;
	volatile struct mx6sdl_iomux_grp_regs *mx6_grp_iomux;

	mx6_ddr_iomux = (struct mx6sdl_iomux_ddr_regs *)MX6SDL_IOM_DDR_BASE;
	mx6_grp_iomux = (struct mx6sdl_iomux_grp_regs *)MX6SDL_IOM_GRP_BASE;

	/* DDR IO Type */
	mx6_grp_iomux->grp_ddr_type = grp->grp_ddr_type;
	mx6_grp_iomux->grp_ddrpke = grp->grp_ddrpke;

	/* Clock */
	mx6_ddr_iomux->dram_sdclk_0 = ddr->dram_sdclk_0;
	mx6_ddr_iomux->dram_sdclk_1 = ddr->dram_sdclk_1;

	/* Address */
	mx6_ddr_iomux->dram_cas = ddr->dram_cas;
	mx6_ddr_iomux->dram_ras = ddr->dram_ras;
	mx6_grp_iomux->grp_addds = grp->grp_addds;

	/* Control */
	mx6_ddr_iomux->dram_reset = ddr->dram_reset;
	mx6_ddr_iomux->dram_sdcke0 = ddr->dram_sdcke0;
	mx6_ddr_iomux->dram_sdcke1 = ddr->dram_sdcke1;
	mx6_ddr_iomux->dram_sdba2 = ddr->dram_sdba2;
	mx6_ddr_iomux->dram_sdodt0 = ddr->dram_sdodt0;
	mx6_ddr_iomux->dram_sdodt1 = ddr->dram_sdodt1;
	mx6_grp_iomux->grp_ctlds = grp->grp_ctlds;

	/* Data Strobes */
	mx6_grp_iomux->grp_ddrmode_ctl = grp->grp_ddrmode_ctl;
	mx6_ddr_iomux->dram_sdqs0 = ddr->dram_sdqs0;
	mx6_ddr_iomux->dram_sdqs1 = ddr->dram_sdqs1;
	if (width >= 32) {
	mx6_ddr_iomux->dram_sdqs2 = ddr->dram_sdqs2;
	mx6_ddr_iomux->dram_sdqs3 = ddr->dram_sdqs3;
	}
	if (width >= 64) {
	mx6_ddr_iomux->dram_sdqs4 = ddr->dram_sdqs4;
	mx6_ddr_iomux->dram_sdqs5 = ddr->dram_sdqs5;
	mx6_ddr_iomux->dram_sdqs6 = ddr->dram_sdqs6;
	mx6_ddr_iomux->dram_sdqs7 = ddr->dram_sdqs7;
	}

	/* Data */
	mx6_grp_iomux->grp_ddrmode = grp->grp_ddrmode;
	mx6_grp_iomux->grp_b0ds = grp->grp_b0ds;
	mx6_grp_iomux->grp_b1ds = grp->grp_b1ds;
	if (width >= 32) {
	mx6_grp_iomux->grp_b2ds = grp->grp_b2ds;
	mx6_grp_iomux->grp_b3ds = grp->grp_b3ds;
	}
	if (width >= 64) {
	mx6_grp_iomux->grp_b4ds = grp->grp_b4ds;
	mx6_grp_iomux->grp_b5ds = grp->grp_b5ds;
	mx6_grp_iomux->grp_b6ds = grp->grp_b6ds;
	mx6_grp_iomux->grp_b7ds = grp->grp_b7ds;
	}
	mx6_ddr_iomux->dram_dqm0 = ddr->dram_dqm0;
	mx6_ddr_iomux->dram_dqm1 = ddr->dram_dqm1;
	if (width >= 32) {
	mx6_ddr_iomux->dram_dqm2 = ddr->dram_dqm2;
	mx6_ddr_iomux->dram_dqm3 = ddr->dram_dqm3;
	}
	if (width >= 64) {
	mx6_ddr_iomux->dram_dqm4 = ddr->dram_dqm4;
	mx6_ddr_iomux->dram_dqm5 = ddr->dram_dqm5;
	mx6_ddr_iomux->dram_dqm6 = ddr->dram_dqm6;
	mx6_ddr_iomux->dram_dqm7 = ddr->dram_dqm7;
	}
	}
	#endif

	/*
	* Configure mx6 mmdc registers based on:
	* - board-specific memory configuration
	* - board-specific calibration data
	* - ddr3 chip details
	*
	* The various calculations here are derived from the Freescale
	* i.Mx6DQSDL DDR3 Script Aid spreadsheet (DOC-94917) designed to generate MMDC
	* configuration registers based on memory system and memory chip parameters.
	*
	* The defaults here are those which were specified in the spreadsheet.
	* For details on each register, refer to the IMX6DQRM and/or IMX6SDLRM
	* section titled MMDC initialization
	*/
	#define MR(val, ba, cmd, cs1) \
	((val << 16) \| (1 << 15) \| (cmd << 4) \| (cs1 << 3) \| ba)
	void mx6_dram_cfg(const struct mx6_ddr_sysinfo *i,
	const struct mx6_mmdc_calibration *c,
	const struct mx6_ddr3_cfg *m)
	{
	volatile struct mmdc_p_regs *mmdc0;
	volatile struct mmdc_p_regs *mmdc1;
	u32 reg;
	u8 tcke, tcksrx, tcksre, txpdll, taofpd, taonpd, trrd;
	u8 todtlon, taxpd, tanpd, tcwl, txp, tfaw, tcl;
	u8 todt_idle_off = 0x4; /* from DDR3 Script Aid spreadsheet */
	u16 trcd, trc, tras, twr, tmrd, trtp, trp, twtr, trfc, txs, txpr;
	u16 CS0_END;
	u16 tdllk = 0x1ff; /* DLL locking time: 512 cycles (JEDEC DDR3) */
	int clkper; /* clock period in picoseconds */
	int clock; /* clock freq in mHz */
	int cs;

	mmdc0 = (struct mmdc_p_regs *)MMDC_P0_BASE_ADDR;
	mmdc1 = (struct mmdc_p_regs *)MMDC_P1_BASE_ADDR;

	/* MX6D/MX6Q: 1066 MHz memory clock, clkper = 1.894ns = 1894ps */
	if (is_cpu_type(MXC_CPU_MX6Q) \|\| is_cpu_type(MXC_CPU_MX6D)) {
	clock = 528;
	tcwl = 4;
	}
	/* MX6S/MX6DL: 800 MHz memory clock, clkper = 2.5ns = 2500ps */
	else {
	clock = 400;
	tcwl = 3;
	}
	clkper = (10001000)/clock; / ps */
	todtlon = tcwl;
	taxpd = tcwl;
	tanpd = tcwl;
	tcwl = tcwl;

	switch (m->density) {
	case 1: /* 1Gb per chip */
	trfc = DIV_ROUND_UP(110000, clkper) - 1;
	txs = DIV_ROUND_UP(120000, clkper) - 1;
	break;
	case 2: /* 2Gb per chip */
	trfc = DIV_ROUND_UP(160000, clkper) - 1;
	txs = DIV_ROUND_UP(170000, clkper) - 1;
	break;
	case 4: /* 4Gb per chip */
	trfc = DIV_ROUND_UP(260000, clkper) - 1;
	txs = DIV_ROUND_UP(270000, clkper) - 1;
	break;
	case 8: /* 8Gb per chip */
	trfc = DIV_ROUND_UP(350000, clkper) - 1;
	txs = DIV_ROUND_UP(360000, clkper) - 1;
	break;
	default:
	/* invalid density */
	printf("invalid chip density\n");
	hang();
	break;
	}
	txpr = txs;

	switch (m->mem_speed) {
	case 800:
	txp = DIV_ROUND_UP(MAX(3*clkper, 7500), clkper) - 1;
	tcke = DIV_ROUND_UP(MAX(3*clkper, 7500), clkper) - 1;
	if (m->pagesz == 1) {
	tfaw = DIV_ROUND_UP(40000, clkper) - 1;
	trrd = DIV_ROUND_UP(MAX(4*clkper, 10000), clkper) - 1;
	} else {
	tfaw = DIV_ROUND_UP(50000, clkper) - 1;
	trrd = DIV_ROUND_UP(MAX(4*clkper, 10000), clkper) - 1;
	}
	break;
	case 1066:
	txp = DIV_ROUND_UP(MAX(3*clkper, 7500), clkper) - 1;
	tcke = DIV_ROUND_UP(MAX(3*clkper, 5625), clkper) - 1;
	if (m->pagesz == 1) {
	tfaw = DIV_ROUND_UP(37500, clkper) - 1;
	trrd = DIV_ROUND_UP(MAX(4*clkper, 7500), clkper) - 1;
	} else {
	tfaw = DIV_ROUND_UP(50000, clkper) - 1;
	trrd = DIV_ROUND_UP(MAX(4*clkper, 10000), clkper) - 1;
	}
	break;
	case 1333:
	txp = DIV_ROUND_UP(MAX(3*clkper, 6000), clkper) - 1;
	tcke = DIV_ROUND_UP(MAX(3*clkper, 5625), clkper) - 1;
	if (m->pagesz == 1) {
	tfaw = DIV_ROUND_UP(30000, clkper) - 1;
	trrd = DIV_ROUND_UP(MAX(4*clkper, 6000), clkper) - 1;
	} else {
	tfaw = DIV_ROUND_UP(45000, clkper) - 1;
	trrd = DIV_ROUND_UP(MAX(4*clkper, 7500), clkper) - 1;
	}
	break;
	case 1600:
	txp = DIV_ROUND_UP(MAX(3*clkper, 6000), clkper) - 1;
	tcke = DIV_ROUND_UP(MAX(3*clkper, 5000), clkper) - 1;
	if (m->pagesz == 1) {
	tfaw = DIV_ROUND_UP(30000, clkper) - 1;
	trrd = DIV_ROUND_UP(MAX(4*clkper, 6000), clkper) - 1;
	} else {
	tfaw = DIV_ROUND_UP(40000, clkper) - 1;
	trrd = DIV_ROUND_UP(MAX(4*clkper, 7500), clkper) - 1;
	}
	break;
	default:
	printf("invalid memory speed\n");
	hang();
	break;
	}
	txpdll = DIV_ROUND_UP(MAX(10*clkper, 24000), clkper) - 1;
	tcl = DIV_ROUND_UP(m->trcd, clkper/10) - 3;
	tcksre = DIV_ROUND_UP(MAX(5*clkper, 10000), clkper);
	tcksrx = tcksre;
	taonpd = DIV_ROUND_UP(2000, clkper) - 1;
	taofpd = taonpd;
	trp = DIV_ROUND_UP(m->trcd, clkper/10) - 1;
	trcd = trp;
	trc = DIV_ROUND_UP(m->trcmin, clkper/10) - 1;
	tras = DIV_ROUND_UP(m->trasmin, clkper/10) - 1;
	twr = DIV_ROUND_UP(15000, clkper) - 1;
	tmrd = DIV_ROUND_UP(MAX(12*clkper, 15000), clkper) - 1;
	twtr = ROUND(MAX(4*clkper, 7500)/clkper, 1) - 1;
	trtp = twtr;
	CS0_END = ((4i->cs_density) <= 120) ? (4i->cs_density)+7 : 127;
	debug("density:%d Gb (%d Gb per chip)\n", i->cs_density, m->density);
	debug("clock: %dMHz (%d ps)\n", clock, clkper);
	debug("memspd:%d\n", m->mem_speed);
	debug("tcke=%d\n", tcke);
	debug("tcksrx=%d\n", tcksrx);
	debug("tcksre=%d\n", tcksre);
	debug("taofpd=%d\n", taofpd);
	debug("taonpd=%d\n", taonpd);
	debug("todtlon=%d\n", todtlon);
	debug("tanpd=%d\n", tanpd);
	debug("taxpd=%d\n", taxpd);
	debug("trfc=%d\n", trfc);
	debug("txs=%d\n", txs);
	debug("txp=%d\n", txp);
	debug("txpdll=%d\n", txpdll);
	debug("tfaw=%d\n", tfaw);
	debug("tcl=%d\n", tcl);
	debug("trcd=%d\n", trcd);
	debug("trp=%d\n", trp);
	debug("trc=%d\n", trc);
	debug("tras=%d\n", tras);
	debug("twr=%d\n", twr);
	debug("tmrd=%d\n", tmrd);
	debug("tcwl=%d\n", tcwl);
	debug("tdllk=%d\n", tdllk);
	debug("trtp=%d\n", trtp);
	debug("twtr=%d\n", twtr);
	debug("trrd=%d\n", trrd);
	debug("txpr=%d\n", txpr);
	debug("CS0_END=%d\n", CS0_END);
	debug("ncs=%d\n", i->ncs);
	debug("Rtt_wr=%d\n", i->rtt_wr);
	debug("Rtt_nom=%d\n", i->rtt_nom);
	debug("SRT=%d\n", m->SRT);
	debug("tcl=%d\n", tcl);
	debug("twr=%d\n", twr);

	/*
	* board-specific configuration:
	* These values are determined empirically and vary per board layout
	* see:
	* appnote, ddr3 spreadsheet
	*/
	mmdc0->mpwldectrl0 = c->p0_mpwldectrl0;
	mmdc0->mpwldectrl1 = c->p0_mpwldectrl1;
	mmdc0->mpdgctrl0 = c->p0_mpdgctrl0;
	mmdc0->mpdgctrl1 = c->p0_mpdgctrl1;
	mmdc0->mprddlctl = c->p0_mprddlctl;
	mmdc0->mpwrdlctl = c->p0_mpwrdlctl;
	if (i->dsize > 1) {
	mmdc1->mpwldectrl0 = c->p1_mpwldectrl0;
	mmdc1->mpwldectrl1 = c->p1_mpwldectrl1;
	mmdc1->mpdgctrl0 = c->p1_mpdgctrl0;
	mmdc1->mpdgctrl1 = c->p1_mpdgctrl1;
	mmdc1->mprddlctl = c->p1_mprddlctl;
	mmdc1->mpwrdlctl = c->p1_mpwrdlctl;
	}

	/* Read data DQ Byte0-3 delay */
	mmdc0->mprddqby0dl = (u32)0x33333333;
	mmdc0->mprddqby1dl = (u32)0x33333333;
	if (i->dsize > 0) {
	mmdc0->mprddqby2dl = (u32)0x33333333;
	mmdc0->mprddqby3dl = (u32)0x33333333;
	}
	if (i->dsize > 1) {
	mmdc1->mprddqby0dl = (u32)0x33333333;
	mmdc1->mprddqby1dl = (u32)0x33333333;
	mmdc1->mprddqby2dl = (u32)0x33333333;
	mmdc1->mprddqby3dl = (u32)0x33333333;
	}

	/* MMDC Termination: rtt_nom:2 RZQ/2(120ohm), rtt_nom:1 RZQ/4(60ohm) */
	reg = (i->rtt_nom == 2) ? 0x00011117 : 0x00022227;
	mmdc0->mpodtctrl = reg;
	if (i->dsize > 1)
	mmdc1->mpodtctrl = reg;

	/* complete calibration */
	reg = (1 << 11); /* Force measurement on delay-lines */
	mmdc0->mpmur0 = reg;
	if (i->dsize > 1)
	mmdc1->mpmur0 = reg;

	/* Step 1: configuration request */
	mmdc0->mdscr = (u32)(1 << 15); /* config request */

	/* Step 2: Timing configuration */
	reg = (trfc << 24) \| (txs << 16) \| (txp << 13) \| (txpdll << 9) \|
	(tfaw << 4) \| tcl;
	mmdc0->mdcfg0 = reg;
	reg = (trcd << 29) \| (trp << 26) \| (trc << 21) \| (tras << 16) \|
	(1 << 15) \| /* trpa */
	(twr << 9) \| (tmrd << 5) \| tcwl;
	mmdc0->mdcfg1 = reg;
	reg = (tdllk << 16) \| (trtp << 6) \| (twtr << 3) \| trrd;
	mmdc0->mdcfg2 = reg;
	reg = (taofpd << 27) \| (taonpd << 24) \| (tanpd << 20) \| (taxpd << 16) \|
	(todtlon << 12) \| (todt_idle_off << 4);
	mmdc0->mdotc = reg;
	mmdc0->mdasp = CS0_END; /* CS addressing */

	/* Step 3: Configure DDR type */
	reg = (i->cs1_mirror << 19) \| (i->walat << 16) \| (i->bi_on << 12) \|
	(i->mif3_mode << 9) \| (i->ralat << 6);
	mmdc0->mdmisc = reg;

	/* Step 4: Configure delay while leaving reset */
	reg = (txpr << 16) \| (i->sde_to_rst << 8) \| (i->rst_to_cke << 0);
	mmdc0->mdor = reg;

	/* Step 5: Configure DDR physical parameters (density and burst len) */
	reg = (m->rowaddr - 11) << 24 \| /* ROW */
	(m->coladdr - 9) << 20 \| /* COL */
	(1 << 19) \| /* Burst Length = 8 for DDR3 */
	(i->dsize << 16); /* DDR data bus size */
	mmdc0->mdctl = reg;

	/* Step 6: Perform ZQ calibration */
	reg = (u32)0xa1390001; /* one-time HW ZQ calib */
	mmdc0->mpzqhwctrl = reg;
	if (i->dsize > 1)
	mmdc1->mpzqhwctrl = reg;

	/* Step 7: Enable MMDC with desired chip select */
	reg = mmdc0->mdctl \|
	(1 << 31) \| /* SDE_0 for CS0 */
	((i->ncs == 2) ? 1 : 0) << 30; /* SDE_1 for CS1 */
	mmdc0->mdctl = reg;

	/* Step 8: Write Mode Registers to Init DDR3 devices */
	for (cs = 0; cs < i->ncs; cs++) {
	/* MR2 */
	reg = (i->rtt_wr & 3) << 9 \| (m->SRT & 1) << 7 \|
	((tcwl - 3) & 3) << 3;
	mmdc0->mdscr = (u32)MR(reg, 2, 3, cs);
	/* MR3 */
	mmdc0->mdscr = (u32)MR(0, 3, 3, cs);
	/* MR1 */
	reg = ((i->rtt_nom & 1) ? 1 : 0) << 2 \|
	((i->rtt_nom & 2) ? 1 : 0) << 6;
	mmdc0->mdscr = (u32)MR(reg, 1, 3, cs);
	reg = ((tcl - 1) << 4) \| /* CAS */
	(1 << 8) \| /* DLL Reset */
	((twr - 3) << 9); /* Write Recovery */
	/* MR0 */
	mmdc0->mdscr = (u32)MR(reg, 0, 3, cs);
	/* ZQ calibration */
	reg = (1 << 10);
	mmdc0->mdscr = (u32)MR(reg, 0, 4, cs);
	}

	/* Step 10: Power down control and self-refresh */
	reg = (tcke & 0x7) << 16 \|
	5 << 12 \| /* PWDT_1: 256 cycles */
	5 << 8 \| /* PWDT_0: 256 cycles */
	1 << 6 \| /* BOTH_CS_PD */
	(tcksrx & 0x7) << 3 \|
	(tcksre & 0x7);
	mmdc0->mdpdc = reg;
	mmdc0->mapsr = (u32)0x00011006; /* ADOPT power down enabled */

	/* Step 11: Configure ZQ calibration: one-time and periodic 1ms */
	mmdc0->mpzqhwctrl = (u32)0xa1390003;
	if (i->dsize > 1)
	mmdc1->mpzqhwctrl = (u32)0xa1390003;

	/* Step 12: Configure and activate periodic refresh */
	reg = (1 << 14) \| /* REF_SEL: Periodic refresh cycles of 32kHz */
	(7 << 11); /* REFR: Refresh Rate - 8 refreshes */
	mmdc0->mdref = reg;

	/* Step 13: Deassert config request - init complete */
	mmdc0->mdscr = (u32)0x00000000;

	/* wait for auto-ZQ calibration to complete */
	mdelay(1);
	}