arm: mx6: ddr: cleanup

No functional changes.

Cc: Stefano Babic <sbabic@denx.de>
Cc: Tim Harvey <tharvey@gateworks.com>
Acked-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il>

1 files changed, 137 insertions, 141 deletions

diff --git a/arch/arm/cpu/armv7/mx6/ddr.c b/arch/arm/cpu/armv7/mx6/ddr.c
index 1ab69f63c85..5fc4d957468 100644
--- a/arch/arm/cpu/armv7/mx6/ddr.c
+++ b/arch/arm/cpu/armv7/mx6/ddr.c
@@ -184,18 +184,18 @@ void mx6sdl_dram_iocfg(unsigned width,
  */
 #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)
+void mx6_dram_cfg(const struct mx6_ddr_sysinfo *sysinfo,
+		  const struct mx6_mmdc_calibration *calib,
+		  const struct mx6_ddr3_cfg *ddr3_cfg)
 {
 	volatile struct mmdc_p_regs *mmdc0;
 	volatile struct mmdc_p_regs *mmdc1;
-	u32 reg;
+	u32 val;
 	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 cs0_end;
 	u16 tdllk = 0x1ff; /* DLL locking time: 512 cycles (JEDEC DDR3) */
 	u8 coladdr;
 	int clkper; /* clock period in picoseconds */
@@ -215,13 +215,12 @@ void mx6_dram_cfg(const struct mx6_ddr_sysinfo *i,
 		clock = 400;
 		tcwl = 3;
 	}
-	clkper = (1000*1000)/clock; /* ps */
+	clkper = (1000 * 1000) / clock; /* pico seconds */
 	todtlon = tcwl;
 	taxpd = tcwl;
 	tanpd = tcwl;
-	tcwl = tcwl;
 
-	switch (m->density) {
+	switch (ddr3_cfg->density) {
 	case 1: /* 1Gb per chip */
 		trfc = DIV_ROUND_UP(110000, clkper) - 1;
 		txs = DIV_ROUND_UP(120000, clkper) - 1;
@@ -240,80 +239,84 @@ void mx6_dram_cfg(const struct mx6_ddr_sysinfo *i,
 		break;
 	default:
 		/* invalid density */
-		printf("invalid chip density\n");
+		puts("invalid chip density\n");
 		hang();
 		break;
 	}
 	txpr = txs;
 
-	switch (m->mem_speed) {
+	switch (ddr3_cfg->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) {
+		txp = DIV_ROUND_UP(MAX(3 * clkper, 7500), clkper) - 1;
+		tcke = DIV_ROUND_UP(MAX(3 * clkper, 7500), clkper) - 1;
+		if (ddr3_cfg->pagesz == 1) {
 			tfaw = DIV_ROUND_UP(40000, clkper) - 1;
-			trrd = DIV_ROUND_UP(MAX(4*clkper, 10000), 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;
+			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) {
+		txp = DIV_ROUND_UP(MAX(3 * clkper, 7500), clkper) - 1;
+		tcke = DIV_ROUND_UP(MAX(3 * clkper, 5625), clkper) - 1;
+		if (ddr3_cfg->pagesz == 1) {
 			tfaw = DIV_ROUND_UP(37500, clkper) - 1;
-			trrd = DIV_ROUND_UP(MAX(4*clkper, 7500), 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;
+			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) {
+		txp = DIV_ROUND_UP(MAX(3 * clkper, 6000), clkper) - 1;
+		tcke = DIV_ROUND_UP(MAX(3 * clkper, 5625), clkper) - 1;
+		if (ddr3_cfg->pagesz == 1) {
 			tfaw = DIV_ROUND_UP(30000, clkper) - 1;
-			trrd = DIV_ROUND_UP(MAX(4*clkper, 6000), 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;
+			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) {
+		txp = DIV_ROUND_UP(MAX(3 * clkper, 6000), clkper) - 1;
+		tcke = DIV_ROUND_UP(MAX(3 * clkper, 5000), clkper) - 1;
+		if (ddr3_cfg->pagesz == 1) {
 			tfaw = DIV_ROUND_UP(30000, clkper) - 1;
-			trrd = DIV_ROUND_UP(MAX(4*clkper, 6000), 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;
+			trrd = DIV_ROUND_UP(MAX(4 * clkper, 7500), clkper) - 1;
 		}
 		break;
 	default:
-		printf("invalid memory speed\n");
+		puts("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;
+	txpdll = DIV_ROUND_UP(MAX(10 * clkper, 24000), clkper) - 1;
+	tcksre = DIV_ROUND_UP(MAX(5 * clkper, 10000), clkper);
 	taonpd = DIV_ROUND_UP(2000, clkper) - 1;
+	tcksrx = tcksre;
 	taofpd = taonpd;
-	trp = DIV_ROUND_UP(m->trcd, clkper/10) - 1;
+	twr  = DIV_ROUND_UP(15000, clkper) - 1;
+	tmrd = DIV_ROUND_UP(MAX(12 * clkper, 15000), clkper) - 1;
+	trc  = DIV_ROUND_UP(ddr3_cfg->trcmin, clkper / 10) - 1;
+	tras = DIV_ROUND_UP(ddr3_cfg->trasmin, clkper / 10) - 1;
+	tcl  = DIV_ROUND_UP(ddr3_cfg->trcd, clkper / 10) - 3;
+	trp  = DIV_ROUND_UP(ddr3_cfg->trcd, clkper / 10) - 1;
+	twtr = ROUND(MAX(4 * clkper, 7500) / clkper, 1) - 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);
+	cs0_end = (4 * sysinfo->cs_density <= 120) ?
+		   4 * sysinfo->cs_density + 7 :
+		   127;
+
+	debug("density:%d Gb (%d Gb per chip)\n",
+	      sysinfo->cs_density, ddr3_cfg->density);
 	debug("clock: %dMHz (%d ps)\n", clock, clkper);
-	debug("memspd:%d\n", m->mem_speed);
+	debug("memspd:%d\n", ddr3_cfg->mem_speed);
 	debug("tcke=%d\n", tcke);
 	debug("tcksrx=%d\n", tcksrx);
 	debug("tcksre=%d\n", tcksre);
@@ -340,11 +343,11 @@ void mx6_dram_cfg(const struct mx6_ddr_sysinfo *i,
 	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("cs0_end=%d\n", cs0_end);
+	debug("ncs=%d\n", sysinfo->ncs);
+	debug("Rtt_wr=%d\n", sysinfo->rtt_wr);
+	debug("Rtt_nom=%d\n", sysinfo->rtt_nom);
+	debug("SRT=%d\n", ddr3_cfg->SRT);
 	debug("tcl=%d\n", tcl);
 	debug("twr=%d\n", twr);
 
@@ -354,142 +357,135 @@ void mx6_dram_cfg(const struct mx6_ddr_sysinfo *i,
 	 *  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;
+	mmdc0->mpwldectrl0 = calib->p0_mpwldectrl0;
+	mmdc0->mpwldectrl1 = calib->p0_mpwldectrl1;
+	mmdc0->mpdgctrl0 = calib->p0_mpdgctrl0;
+	mmdc0->mpdgctrl1 = calib->p0_mpdgctrl1;
+	mmdc0->mprddlctl = calib->p0_mprddlctl;
+	mmdc0->mpwrdlctl = calib->p0_mpwrdlctl;
+	if (sysinfo->dsize > 1) {
+		mmdc1->mpwldectrl0 = calib->p1_mpwldectrl0;
+		mmdc1->mpwldectrl1 = calib->p1_mpwldectrl1;
+		mmdc1->mpdgctrl0 = calib->p1_mpdgctrl0;
+		mmdc1->mpdgctrl1 = calib->p1_mpdgctrl1;
+		mmdc1->mprddlctl = calib->p1_mprddlctl;
+		mmdc1->mpwrdlctl = calib->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;
+	mmdc0->mprddqby0dl = 0x33333333;
+	mmdc0->mprddqby1dl = 0x33333333;
+	if (sysinfo->dsize > 0) {
+		mmdc0->mprddqby2dl = 0x33333333;
+		mmdc0->mprddqby3dl = 0x33333333;
 	}
-	if (i->dsize > 1) {
-		mmdc1->mprddqby0dl = (u32)0x33333333;
-		mmdc1->mprddqby1dl = (u32)0x33333333;
-		mmdc1->mprddqby2dl = (u32)0x33333333;
-		mmdc1->mprddqby3dl = (u32)0x33333333;
+
+	if (sysinfo->dsize > 1) {
+		mmdc1->mprddqby0dl = 0x33333333;
+		mmdc1->mprddqby1dl = 0x33333333;
+		mmdc1->mprddqby2dl = 0x33333333;
+		mmdc1->mprddqby3dl = 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;
+	val = (sysinfo->rtt_nom == 2) ? 0x00011117 : 0x00022227;
+	mmdc0->mpodtctrl = val;
+	if (sysinfo->dsize > 1)
+		mmdc1->mpodtctrl = val;
 
 	/* complete calibration */
-	reg = (1 << 11); /* Force measurement on delay-lines */
-	mmdc0->mpmur0 = reg;
-	if (i->dsize > 1)
-		mmdc1->mpmur0 = reg;
+	val = (1 << 11); /* Force measurement on delay-lines */
+	mmdc0->mpmur0 = val;
+	if (sysinfo->dsize > 1)
+		mmdc1->mpmur0 = val;
 
 	/* 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 */
+	mmdc0->mdcfg0 = (trfc << 24) | (txs << 16) | (txp << 13) |
+			(txpdll << 9) | (tfaw << 4) | tcl;
+	mmdc0->mdcfg1 = (trcd << 29) | (trp << 26) | (trc << 21) |
+			(tras << 16) | (1 << 15) /* trpa */ |
+			(twr << 9) | (tmrd << 5) | tcwl;
+	mmdc0->mdcfg2 = (tdllk << 16) | (trtp << 6) | (twtr << 3) | trrd;
+	mmdc0->mdotc = (taofpd << 27) | (taonpd << 24) | (tanpd << 20) |
+		       (taxpd << 16) | (todtlon << 12) | (todt_idle_off << 4);
+	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;
+	mmdc0->mdmisc = (sysinfo->cs1_mirror << 19) | (sysinfo->walat << 16) |
+			(sysinfo->bi_on << 12) | (sysinfo->mif3_mode << 9) |
+			(sysinfo->ralat << 6);
 
 	/* Step 4: Configure delay while leaving reset */
-	reg = (txpr << 16) | (i->sde_to_rst << 8) | (i->rst_to_cke << 0);
-	mmdc0->mdor = reg;
+	mmdc0->mdor = (txpr << 16) | (sysinfo->sde_to_rst << 8) |
+		      (sysinfo->rst_to_cke << 0);
 
 	/* Step 5: Configure DDR physical parameters (density and burst len) */
-	coladdr = m->coladdr;
-	if (m->coladdr == 8)		/* 8-bit COL is 0x3 */
+	coladdr = ddr3_cfg->coladdr;
+	if (ddr3_cfg->coladdr == 8)		/* 8-bit COL is 0x3 */
 		coladdr += 4;
-	else if (m->coladdr == 12)	/* 12-bit COL is 0x4 */
+	else if (ddr3_cfg->coladdr == 12)	/* 12-bit COL is 0x4 */
 		coladdr += 1;
-	reg = (m->rowaddr - 11) << 24 |		/* ROW */
-	      (coladdr - 9) << 20 |		/* COL */
-	      (1 << 19) |			/* Burst Length = 8 for DDR3 */
-	      (i->dsize << 16);			/* DDR data bus size */
-	mmdc0->mdctl = reg;
+	mmdc0->mdctl =  (ddr3_cfg->rowaddr - 11) << 24 |	/* ROW */
+			(coladdr - 9) << 20 |			/* COL */
+			(1 << 19) |		/* Burst Length = 8 for DDR3 */
+			(sysinfo->dsize << 16);		/* DDR data bus size */
 
 	/* Step 6: Perform ZQ calibration */
-	reg = (u32)0xa1390001; /* one-time HW ZQ calib */
-	mmdc0->mpzqhwctrl = reg;
-	if (i->dsize > 1)
-		mmdc1->mpzqhwctrl = reg;
+	val = 0xa1390001; /* one-time HW ZQ calib */
+	mmdc0->mpzqhwctrl = val;
+	if (sysinfo->dsize > 1)
+		mmdc1->mpzqhwctrl = val;
 
 	/* 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;
+	mmdc0->mdctl |= (1 << 31) |			     /* SDE_0 for CS0 */
+			((sysinfo->ncs == 2) ? 1 : 0) << 30; /* SDE_1 for CS1 */
 
 	/* Step 8: Write Mode Registers to Init DDR3 devices */
-	for (cs = 0; cs < i->ncs; cs++) {
+	for (cs = 0; cs < sysinfo->ncs; cs++) {
 		/* MR2 */
-		reg = (i->rtt_wr & 3) << 9 | (m->SRT & 1) << 7 |
+		val = (sysinfo->rtt_wr & 3) << 9 | (ddr3_cfg->SRT & 1) << 7 |
 		      ((tcwl - 3) & 3) << 3;
-		mmdc0->mdscr = (u32)MR(reg, 2, 3, cs);
+		mmdc0->mdscr = MR(val, 2, 3, cs);
 		/* MR3 */
-		mmdc0->mdscr = (u32)MR(0, 3, 3, cs);
+		mmdc0->mdscr = 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 */
+		val = ((sysinfo->rtt_nom & 1) ? 1 : 0) << 2 |
+		      ((sysinfo->rtt_nom & 2) ? 1 : 0) << 6;
+		mmdc0->mdscr = MR(val, 1, 3, cs);
+		/* MR0 */
+		val = ((tcl - 1) << 4) |	/* CAS */
 		      (1 << 8)   |		/* DLL Reset */
 		      ((twr - 3) << 9);		/* Write Recovery */
-		/* MR0 */
-		mmdc0->mdscr = (u32)MR(reg, 0, 3, cs);
+		mmdc0->mdscr = MR(val, 0, 3, cs);
 		/* ZQ calibration */
-		reg = (1 << 10);
-		mmdc0->mdscr = (u32)MR(reg, 0, 4, cs);
+		val = (1 << 10);
+		mmdc0->mdscr = MR(val, 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 */
+	mmdc0->mdpdc = (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->mapsr = 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;
+	val = 0xa1390003;
+	mmdc0->mpzqhwctrl = val;
+	if (sysinfo->dsize > 1)
+		mmdc1->mpzqhwctrl = val;
 
 	/* 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;
+	mmdc0->mdref = (1 << 14) | /* REF_SEL: Periodic refresh cycle: 32kHz */
+		       (7 << 11);  /* REFR: Refresh Rate - 8 refreshes */
 
 	/* Step 13: Deassert config request - init complete */
-	mmdc0->mdscr = (u32)0x00000000;
+	mmdc0->mdscr = 0x00000000;
 
 	/* wait for auto-ZQ calibration to complete */
 	mdelay(1);