drivers/ddr/fsl/fsl_ddr_gen4.c - github/trini/u-boot - Gitiles

 /*
  * Copyright 2014 Freescale Semiconductor, Inc.
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */

 #include <common.h>
 #include <asm/io.h>
 #include <fsl_ddr_sdram.h>
 #include <asm/processor.h>
 #include <fsl_ddr.h>

 #if (CONFIG_CHIP_SELECTS_PER_CTRL > 4)
 #error Invalid setting for CONFIG_CHIP_SELECTS_PER_CTRL
 #endif

 /*
  * regs has the to-be-set values for DDR controller registers
  * ctrl_num is the DDR controller number
  * step: 0 goes through the initialization in one pass
  *       1 sets registers and returns before enabling controller
  *       2 resumes from step 1 and continues to initialize
  * Dividing the initialization to two steps to deassert DDR reset signal
  * to comply with JEDEC specs for RDIMMs.
  */
 void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs,
 			     unsigned int ctrl_num, int step)
 {
 	unsigned int i, bus_width;
 	struct ccsr_ddr __iomem *ddr;
 	u32 temp_sdram_cfg;
 	u32 total_gb_size_per_controller;
 	int timeout;

 	switch (ctrl_num) {
 	case 0:
 		ddr = (void *)CONFIG_SYS_FSL_DDR_ADDR;
 		break;
 #if defined(CONFIG_SYS_FSL_DDR2_ADDR) && (CONFIG_NUM_DDR_CONTROLLERS > 1)
 	case 1:
 		ddr = (void *)CONFIG_SYS_FSL_DDR2_ADDR;
 		break;
 #endif
 #if defined(CONFIG_SYS_FSL_DDR3_ADDR) && (CONFIG_NUM_DDR_CONTROLLERS > 2)
 	case 2:
 		ddr = (void *)CONFIG_SYS_FSL_DDR3_ADDR;
 		break;
 #endif
 #if defined(CONFIG_SYS_FSL_DDR4_ADDR) && (CONFIG_NUM_DDR_CONTROLLERS > 3)
 	case 3:
 		ddr = (void *)CONFIG_SYS_FSL_DDR4_ADDR;
 		break;
 #endif
 	default:
 		printf("%s unexpected ctrl_num = %u\n", __func__, ctrl_num);
 		return;
 	}

 	if (step == 2)
 		goto step2;

 	if (regs->ddr_eor)
 		ddr_out32(&ddr->eor, regs->ddr_eor);

 	ddr_out32(&ddr->sdram_clk_cntl, regs->ddr_sdram_clk_cntl);

 	for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
 		if (i == 0) {
 			ddr_out32(&ddr->cs0_bnds, regs->cs[i].bnds);
 			ddr_out32(&ddr->cs0_config, regs->cs[i].config);
 			ddr_out32(&ddr->cs0_config_2, regs->cs[i].config_2);

 		} else if (i == 1) {
 			ddr_out32(&ddr->cs1_bnds, regs->cs[i].bnds);
 			ddr_out32(&ddr->cs1_config, regs->cs[i].config);
 			ddr_out32(&ddr->cs1_config_2, regs->cs[i].config_2);

 		} else if (i == 2) {
 			ddr_out32(&ddr->cs2_bnds, regs->cs[i].bnds);
 			ddr_out32(&ddr->cs2_config, regs->cs[i].config);
 			ddr_out32(&ddr->cs2_config_2, regs->cs[i].config_2);

 		} else if (i == 3) {
 			ddr_out32(&ddr->cs3_bnds, regs->cs[i].bnds);
 			ddr_out32(&ddr->cs3_config, regs->cs[i].config);
 			ddr_out32(&ddr->cs3_config_2, regs->cs[i].config_2);
 		}
 	}

 	ddr_out32(&ddr->timing_cfg_3, regs->timing_cfg_3);
 	ddr_out32(&ddr->timing_cfg_0, regs->timing_cfg_0);
 	ddr_out32(&ddr->timing_cfg_1, regs->timing_cfg_1);
 	ddr_out32(&ddr->timing_cfg_2, regs->timing_cfg_2);
 	ddr_out32(&ddr->timing_cfg_4, regs->timing_cfg_4);
 	ddr_out32(&ddr->timing_cfg_5, regs->timing_cfg_5);
 	ddr_out32(&ddr->timing_cfg_6, regs->timing_cfg_6);
 	ddr_out32(&ddr->timing_cfg_7, regs->timing_cfg_7);
 	ddr_out32(&ddr->timing_cfg_8, regs->timing_cfg_8);
 	ddr_out32(&ddr->timing_cfg_9, regs->timing_cfg_9);
 	ddr_out32(&ddr->ddr_zq_cntl, regs->ddr_zq_cntl);
 	ddr_out32(&ddr->dq_map_0, regs->dq_map_0);
 	ddr_out32(&ddr->dq_map_1, regs->dq_map_1);
 	ddr_out32(&ddr->dq_map_2, regs->dq_map_2);
 	ddr_out32(&ddr->dq_map_3, regs->dq_map_3);
 	ddr_out32(&ddr->sdram_cfg_2, regs->ddr_sdram_cfg_2);
 	ddr_out32(&ddr->sdram_cfg_3, regs->ddr_sdram_cfg_3);
 	ddr_out32(&ddr->sdram_mode, regs->ddr_sdram_mode);
 	ddr_out32(&ddr->sdram_mode_2, regs->ddr_sdram_mode_2);
 	ddr_out32(&ddr->sdram_mode_3, regs->ddr_sdram_mode_3);
 	ddr_out32(&ddr->sdram_mode_4, regs->ddr_sdram_mode_4);
 	ddr_out32(&ddr->sdram_mode_5, regs->ddr_sdram_mode_5);
 	ddr_out32(&ddr->sdram_mode_6, regs->ddr_sdram_mode_6);
 	ddr_out32(&ddr->sdram_mode_7, regs->ddr_sdram_mode_7);
 	ddr_out32(&ddr->sdram_mode_8, regs->ddr_sdram_mode_8);
 	ddr_out32(&ddr->sdram_mode_9, regs->ddr_sdram_mode_9);
 	ddr_out32(&ddr->sdram_mode_10, regs->ddr_sdram_mode_10);
 	ddr_out32(&ddr->sdram_mode_11, regs->ddr_sdram_mode_11);
 	ddr_out32(&ddr->sdram_mode_12, regs->ddr_sdram_mode_12);
 	ddr_out32(&ddr->sdram_mode_13, regs->ddr_sdram_mode_13);
 	ddr_out32(&ddr->sdram_mode_14, regs->ddr_sdram_mode_14);
 	ddr_out32(&ddr->sdram_mode_15, regs->ddr_sdram_mode_15);
 	ddr_out32(&ddr->sdram_mode_16, regs->ddr_sdram_mode_16);
 	ddr_out32(&ddr->sdram_md_cntl, regs->ddr_sdram_md_cntl);
 	ddr_out32(&ddr->sdram_interval, regs->ddr_sdram_interval);
 	ddr_out32(&ddr->sdram_data_init, regs->ddr_data_init);
 	ddr_out32(&ddr->init_addr, regs->ddr_init_addr);
 	ddr_out32(&ddr->init_ext_addr, regs->ddr_init_ext_addr);
 	ddr_out32(&ddr->ddr_wrlvl_cntl, regs->ddr_wrlvl_cntl);
 #ifndef CONFIG_SYS_FSL_DDR_EMU
 	/*
 	 * Skip these two registers if running on emulator
 	 * because emulator doesn't have skew between bytes.
 	 */

 	if (regs->ddr_wrlvl_cntl_2)
 		ddr_out32(&ddr->ddr_wrlvl_cntl_2, regs->ddr_wrlvl_cntl_2);
 	if (regs->ddr_wrlvl_cntl_3)
 		ddr_out32(&ddr->ddr_wrlvl_cntl_3, regs->ddr_wrlvl_cntl_3);
 #endif

 	ddr_out32(&ddr->ddr_sr_cntr, regs->ddr_sr_cntr);
 	ddr_out32(&ddr->ddr_sdram_rcw_1, regs->ddr_sdram_rcw_1);
 	ddr_out32(&ddr->ddr_sdram_rcw_2, regs->ddr_sdram_rcw_2);
 	ddr_out32(&ddr->ddr_sdram_rcw_3, regs->ddr_sdram_rcw_3);
 	ddr_out32(&ddr->ddr_sdram_rcw_4, regs->ddr_sdram_rcw_4);
 	ddr_out32(&ddr->ddr_sdram_rcw_5, regs->ddr_sdram_rcw_5);
 	ddr_out32(&ddr->ddr_sdram_rcw_6, regs->ddr_sdram_rcw_6);
 	ddr_out32(&ddr->ddr_cdr1, regs->ddr_cdr1);
 	ddr_out32(&ddr->ddr_cdr2, regs->ddr_cdr2);
 	ddr_out32(&ddr->err_disable, regs->err_disable);
 	ddr_out32(&ddr->err_int_en, regs->err_int_en);
 	for (i = 0; i < 32; i++) {
 		if (regs->debug[i]) {
 			debug("Write to debug_%d as %08x\n",
 			      i+1, regs->debug[i]);
 			ddr_out32(&ddr->debug[i], regs->debug[i]);
 		}
 	}

 	/*
 	 * For RDIMMs, JEDEC spec requires clocks to be stable before reset is
 	 * deasserted. Clocks start when any chip select is enabled and clock
 	 * control register is set. Because all DDR components are connected to
 	 * one reset signal, this needs to be done in two steps. Step 1 is to
 	 * get the clocks started. Step 2 resumes after reset signal is
 	 * deasserted.
 	 */
 	if (step == 1) {
 		udelay(200);
 		return;
 	}

 step2:
 	/* Set, but do not enable the memory */
 	temp_sdram_cfg = regs->ddr_sdram_cfg;
 	temp_sdram_cfg &= ~(SDRAM_CFG_MEM_EN);
 	ddr_out32(&ddr->sdram_cfg, temp_sdram_cfg);

 	/*
 	 * 500 painful micro-seconds must elapse between
 	 * the DDR clock setup and the DDR config enable.
 	 * DDR2 need 200 us, and DDR3 need 500 us from spec,
 	 * we choose the max, that is 500 us for all of case.
 	 */
 	udelay(500);
 	asm volatile("sync;isync");

 	/* Let the controller go */
 	temp_sdram_cfg = ddr_in32(&ddr->sdram_cfg) & ~SDRAM_CFG_BI;
 	ddr_out32(&ddr->sdram_cfg, temp_sdram_cfg | SDRAM_CFG_MEM_EN);
 	asm volatile("sync;isync");

 	total_gb_size_per_controller = 0;
 	for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
 		if (!(regs->cs[i].config & 0x80000000))
 			continue;
 		total_gb_size_per_controller += 1 << (
 			((regs->cs[i].config >> 14) & 0x3) + 2 +
 			((regs->cs[i].config >> 8) & 0x7) + 12 +
 			((regs->cs[i].config >> 4) & 0x3) + 0 +
 			((regs->cs[i].config >> 0) & 0x7) + 8 +
 			3 - ((regs->ddr_sdram_cfg >> 19) & 0x3) -
 			26);			/* minus 26 (count of 64M) */
 	}
 	if (fsl_ddr_get_intl3r() & 0x80000000)	/* 3-way interleaving */
 		total_gb_size_per_controller *= 3;
 	else if (regs->cs[0].config & 0x20000000) /* 2-way interleaving */
 		total_gb_size_per_controller <<= 1;
 	/*
 	 * total memory / bus width = transactions needed
 	 * transactions needed / data rate = seconds
 	 * to add plenty of buffer, double the time
 	 * For example, 2GB on 666MT/s 64-bit bus takes about 402ms
 	 * Let's wait for 800ms
 	 */
 	bus_width = 3 - ((ddr->sdram_cfg & SDRAM_CFG_DBW_MASK)
 			>> SDRAM_CFG_DBW_SHIFT);
 	timeout = ((total_gb_size_per_controller << (6 - bus_width)) * 100 /
 		(get_ddr_freq(0) >> 20)) << 2;
 	total_gb_size_per_controller >>= 4;	/* shift down to gb size */
 	debug("total %d GB\n", total_gb_size_per_controller);
 	debug("Need to wait up to %d * 10ms\n", timeout);

 	/* Poll DDR_SDRAM_CFG_2[D_INIT] bit until auto-data init is done.  */
 	while ((ddr_in32(&ddr->sdram_cfg_2) & SDRAM_CFG2_D_INIT) &&
 		(timeout >= 0)) {
 		udelay(10000);		/* throttle polling rate */
 		timeout--;
 	}

 	if (timeout <= 0)
 		printf("Waiting for D_INIT timeout. Memory may not work.\n");

 }
	/*
	* Copyright 2014 Freescale Semiconductor, Inc.
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/

	#include <common.h>
	#include <asm/io.h>
	#include <fsl_ddr_sdram.h>
	#include <asm/processor.h>
	#include <fsl_ddr.h>

	#if (CONFIG_CHIP_SELECTS_PER_CTRL > 4)
	#error Invalid setting for CONFIG_CHIP_SELECTS_PER_CTRL
	#endif

	/*
	* regs has the to-be-set values for DDR controller registers
	* ctrl_num is the DDR controller number
	* step: 0 goes through the initialization in one pass
	* 1 sets registers and returns before enabling controller
	* 2 resumes from step 1 and continues to initialize
	* Dividing the initialization to two steps to deassert DDR reset signal
	* to comply with JEDEC specs for RDIMMs.
	*/
	void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs,
	unsigned int ctrl_num, int step)
	{
	unsigned int i, bus_width;
	struct ccsr_ddr __iomem *ddr;
	u32 temp_sdram_cfg;
	u32 total_gb_size_per_controller;
	int timeout;

	switch (ctrl_num) {
	case 0:
	ddr = (void *)CONFIG_SYS_FSL_DDR_ADDR;
	break;
	#if defined(CONFIG_SYS_FSL_DDR2_ADDR) && (CONFIG_NUM_DDR_CONTROLLERS > 1)
	case 1:
	ddr = (void *)CONFIG_SYS_FSL_DDR2_ADDR;
	break;
	#endif
	#if defined(CONFIG_SYS_FSL_DDR3_ADDR) && (CONFIG_NUM_DDR_CONTROLLERS > 2)
	case 2:
	ddr = (void *)CONFIG_SYS_FSL_DDR3_ADDR;
	break;
	#endif
	#if defined(CONFIG_SYS_FSL_DDR4_ADDR) && (CONFIG_NUM_DDR_CONTROLLERS > 3)
	case 3:
	ddr = (void *)CONFIG_SYS_FSL_DDR4_ADDR;
	break;
	#endif
	default:
	printf("%s unexpected ctrl_num = %u\n", __func__, ctrl_num);
	return;
	}

	if (step == 2)
	goto step2;

	if (regs->ddr_eor)
	ddr_out32(&ddr->eor, regs->ddr_eor);

	ddr_out32(&ddr->sdram_clk_cntl, regs->ddr_sdram_clk_cntl);

	for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
	if (i == 0) {
	ddr_out32(&ddr->cs0_bnds, regs->cs[i].bnds);
	ddr_out32(&ddr->cs0_config, regs->cs[i].config);
	ddr_out32(&ddr->cs0_config_2, regs->cs[i].config_2);

	} else if (i == 1) {
	ddr_out32(&ddr->cs1_bnds, regs->cs[i].bnds);
	ddr_out32(&ddr->cs1_config, regs->cs[i].config);
	ddr_out32(&ddr->cs1_config_2, regs->cs[i].config_2);

	} else if (i == 2) {
	ddr_out32(&ddr->cs2_bnds, regs->cs[i].bnds);
	ddr_out32(&ddr->cs2_config, regs->cs[i].config);
	ddr_out32(&ddr->cs2_config_2, regs->cs[i].config_2);

	} else if (i == 3) {
	ddr_out32(&ddr->cs3_bnds, regs->cs[i].bnds);
	ddr_out32(&ddr->cs3_config, regs->cs[i].config);
	ddr_out32(&ddr->cs3_config_2, regs->cs[i].config_2);
	}
	}

	ddr_out32(&ddr->timing_cfg_3, regs->timing_cfg_3);
	ddr_out32(&ddr->timing_cfg_0, regs->timing_cfg_0);
	ddr_out32(&ddr->timing_cfg_1, regs->timing_cfg_1);
	ddr_out32(&ddr->timing_cfg_2, regs->timing_cfg_2);
	ddr_out32(&ddr->timing_cfg_4, regs->timing_cfg_4);
	ddr_out32(&ddr->timing_cfg_5, regs->timing_cfg_5);
	ddr_out32(&ddr->timing_cfg_6, regs->timing_cfg_6);
	ddr_out32(&ddr->timing_cfg_7, regs->timing_cfg_7);
	ddr_out32(&ddr->timing_cfg_8, regs->timing_cfg_8);
	ddr_out32(&ddr->timing_cfg_9, regs->timing_cfg_9);
	ddr_out32(&ddr->ddr_zq_cntl, regs->ddr_zq_cntl);
	ddr_out32(&ddr->dq_map_0, regs->dq_map_0);
	ddr_out32(&ddr->dq_map_1, regs->dq_map_1);
	ddr_out32(&ddr->dq_map_2, regs->dq_map_2);
	ddr_out32(&ddr->dq_map_3, regs->dq_map_3);
	ddr_out32(&ddr->sdram_cfg_2, regs->ddr_sdram_cfg_2);
	ddr_out32(&ddr->sdram_cfg_3, regs->ddr_sdram_cfg_3);
	ddr_out32(&ddr->sdram_mode, regs->ddr_sdram_mode);
	ddr_out32(&ddr->sdram_mode_2, regs->ddr_sdram_mode_2);
	ddr_out32(&ddr->sdram_mode_3, regs->ddr_sdram_mode_3);
	ddr_out32(&ddr->sdram_mode_4, regs->ddr_sdram_mode_4);
	ddr_out32(&ddr->sdram_mode_5, regs->ddr_sdram_mode_5);
	ddr_out32(&ddr->sdram_mode_6, regs->ddr_sdram_mode_6);
	ddr_out32(&ddr->sdram_mode_7, regs->ddr_sdram_mode_7);
	ddr_out32(&ddr->sdram_mode_8, regs->ddr_sdram_mode_8);
	ddr_out32(&ddr->sdram_mode_9, regs->ddr_sdram_mode_9);
	ddr_out32(&ddr->sdram_mode_10, regs->ddr_sdram_mode_10);
	ddr_out32(&ddr->sdram_mode_11, regs->ddr_sdram_mode_11);
	ddr_out32(&ddr->sdram_mode_12, regs->ddr_sdram_mode_12);
	ddr_out32(&ddr->sdram_mode_13, regs->ddr_sdram_mode_13);
	ddr_out32(&ddr->sdram_mode_14, regs->ddr_sdram_mode_14);
	ddr_out32(&ddr->sdram_mode_15, regs->ddr_sdram_mode_15);
	ddr_out32(&ddr->sdram_mode_16, regs->ddr_sdram_mode_16);
	ddr_out32(&ddr->sdram_md_cntl, regs->ddr_sdram_md_cntl);
	ddr_out32(&ddr->sdram_interval, regs->ddr_sdram_interval);
	ddr_out32(&ddr->sdram_data_init, regs->ddr_data_init);
	ddr_out32(&ddr->init_addr, regs->ddr_init_addr);
	ddr_out32(&ddr->init_ext_addr, regs->ddr_init_ext_addr);
	ddr_out32(&ddr->ddr_wrlvl_cntl, regs->ddr_wrlvl_cntl);
	#ifndef CONFIG_SYS_FSL_DDR_EMU
	/*
	* Skip these two registers if running on emulator
	* because emulator doesn't have skew between bytes.
	*/

	if (regs->ddr_wrlvl_cntl_2)
	ddr_out32(&ddr->ddr_wrlvl_cntl_2, regs->ddr_wrlvl_cntl_2);
	if (regs->ddr_wrlvl_cntl_3)
	ddr_out32(&ddr->ddr_wrlvl_cntl_3, regs->ddr_wrlvl_cntl_3);
	#endif

	ddr_out32(&ddr->ddr_sr_cntr, regs->ddr_sr_cntr);
	ddr_out32(&ddr->ddr_sdram_rcw_1, regs->ddr_sdram_rcw_1);
	ddr_out32(&ddr->ddr_sdram_rcw_2, regs->ddr_sdram_rcw_2);
	ddr_out32(&ddr->ddr_sdram_rcw_3, regs->ddr_sdram_rcw_3);
	ddr_out32(&ddr->ddr_sdram_rcw_4, regs->ddr_sdram_rcw_4);
	ddr_out32(&ddr->ddr_sdram_rcw_5, regs->ddr_sdram_rcw_5);
	ddr_out32(&ddr->ddr_sdram_rcw_6, regs->ddr_sdram_rcw_6);
	ddr_out32(&ddr->ddr_cdr1, regs->ddr_cdr1);
	ddr_out32(&ddr->ddr_cdr2, regs->ddr_cdr2);
	ddr_out32(&ddr->err_disable, regs->err_disable);
	ddr_out32(&ddr->err_int_en, regs->err_int_en);
	for (i = 0; i < 32; i++) {
	if (regs->debug[i]) {
	debug("Write to debug_%d as %08x\n",
	i+1, regs->debug[i]);
	ddr_out32(&ddr->debug[i], regs->debug[i]);
	}
	}

	/*
	* For RDIMMs, JEDEC spec requires clocks to be stable before reset is
	* deasserted. Clocks start when any chip select is enabled and clock
	* control register is set. Because all DDR components are connected to
	* one reset signal, this needs to be done in two steps. Step 1 is to
	* get the clocks started. Step 2 resumes after reset signal is
	* deasserted.
	*/
	if (step == 1) {
	udelay(200);
	return;
	}

	step2:
	/* Set, but do not enable the memory */
	temp_sdram_cfg = regs->ddr_sdram_cfg;
	temp_sdram_cfg &= ~(SDRAM_CFG_MEM_EN);
	ddr_out32(&ddr->sdram_cfg, temp_sdram_cfg);

	/*
	* 500 painful micro-seconds must elapse between
	* the DDR clock setup and the DDR config enable.
	* DDR2 need 200 us, and DDR3 need 500 us from spec,
	* we choose the max, that is 500 us for all of case.
	*/
	udelay(500);
	asm volatile("sync;isync");

	/* Let the controller go */
	temp_sdram_cfg = ddr_in32(&ddr->sdram_cfg) & ~SDRAM_CFG_BI;
	ddr_out32(&ddr->sdram_cfg, temp_sdram_cfg \| SDRAM_CFG_MEM_EN);
	asm volatile("sync;isync");

	total_gb_size_per_controller = 0;
	for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
	if (!(regs->cs[i].config & 0x80000000))
	continue;
	total_gb_size_per_controller += 1 << (
	((regs->cs[i].config >> 14) & 0x3) + 2 +
	((regs->cs[i].config >> 8) & 0x7) + 12 +
	((regs->cs[i].config >> 4) & 0x3) + 0 +
	((regs->cs[i].config >> 0) & 0x7) + 8 +
	3 - ((regs->ddr_sdram_cfg >> 19) & 0x3) -
	26); /* minus 26 (count of 64M) */
	}
	if (fsl_ddr_get_intl3r() & 0x80000000) /* 3-way interleaving */
	total_gb_size_per_controller *= 3;
	else if (regs->cs[0].config & 0x20000000) /* 2-way interleaving */
	total_gb_size_per_controller <<= 1;
	/*
	* total memory / bus width = transactions needed
	* transactions needed / data rate = seconds
	* to add plenty of buffer, double the time
	* For example, 2GB on 666MT/s 64-bit bus takes about 402ms
	* Let's wait for 800ms
	*/
	bus_width = 3 - ((ddr->sdram_cfg & SDRAM_CFG_DBW_MASK)
	>> SDRAM_CFG_DBW_SHIFT);
	timeout = ((total_gb_size_per_controller << (6 - bus_width)) * 100 /
	(get_ddr_freq(0) >> 20)) << 2;
	total_gb_size_per_controller >>= 4; /* shift down to gb size */
	debug("total %d GB\n", total_gb_size_per_controller);
	debug("Need to wait up to %d * 10ms\n", timeout);

	/* Poll DDR_SDRAM_CFG_2[D_INIT] bit until auto-data init is done. */
	while ((ddr_in32(&ddr->sdram_cfg_2) & SDRAM_CFG2_D_INIT) &&
	(timeout >= 0)) {
	udelay(10000); /* throttle polling rate */
	timeout--;
	}

	if (timeout <= 0)
	printf("Waiting for D_INIT timeout. Memory may not work.\n");

	}