board/lwmon5/sdram.c - uboot/prism - Git at Google

 /*
  * (C) Copyright 2006
  * Sylvie Gohl,		    AMCC/IBM, gohl.sylvie@fr.ibm.com
  * Jacqueline Pira-Ferriol, AMCC/IBM, jpira-ferriol@fr.ibm.com
  * Thierry Roman,	    AMCC/IBM, thierry_roman@fr.ibm.com
  * Alain Saurel,	    AMCC/IBM, alain.saurel@fr.ibm.com
  * Robert Snyder,	    AMCC/IBM, rob.snyder@fr.ibm.com
  *
  * (C) Copyright 2007-2008
  * Stefan Roese, DENX Software Engineering, sr@denx.de.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation; either version 2 of
  * the License, or (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  * MA 02111-1307 USA
  */

 /* define DEBUG for debugging output (obviously ;-)) */
 #if 0
 #define DEBUG
 #endif

 #include <common.h>
 #include <asm/processor.h>
 #include <asm/mmu.h>
 #include <asm/io.h>
 #include <asm/cache.h>
 #include <ppc440.h>
 #include <watchdog.h>

 /*
  * This DDR2 setup code can dynamically setup the TLB entries for the DDR2 memory
  * region. Right now the cache should still be disabled in U-Boot because of the
  * EMAC driver, that need it's buffer descriptor to be located in non cached
  * memory.
  *
  * If at some time this restriction doesn't apply anymore, just define
  * CONFIG_SYS_ENABLE_SDRAM_CACHE in the board config file and this code should setup
  * everything correctly.
  */
 #ifdef CONFIG_SYS_ENABLE_SDRAM_CACHE
 #define MY_TLB_WORD2_I_ENABLE	0			/* enable caching on SDRAM */
 #else
 #define MY_TLB_WORD2_I_ENABLE	TLB_WORD2_I_ENABLE	/* disable caching on SDRAM */
 #endif

 /*-----------------------------------------------------------------------------+
  * Prototypes
  *-----------------------------------------------------------------------------*/
 extern int denali_wait_for_dlllock(void);
 extern void denali_core_search_data_eye(void);
 extern void dcbz_area(u32 start_address, u32 num_bytes);

 static u32 is_ecc_enabled(void)
 {
 	u32 val;

 	mfsdram(DDR0_22, val);
 	val &= DDR0_22_CTRL_RAW_MASK;
 	if (val)
 		return 1;
 	else
 		return 0;
 }

 void board_add_ram_info(int use_default)
 {
 	PPC4xx_SYS_INFO board_cfg;
 	u32 val;

 	if (is_ecc_enabled())
 		puts(" (ECC");
 	else
 		puts(" (ECC not");

 	get_sys_info(&board_cfg);
 	printf(" enabled, %ld MHz", (board_cfg.freqPLB * 2) / 1000000);

 	mfsdram(DDR0_03, val);
 	val = DDR0_03_CASLAT_DECODE(val);
 	printf(", CL%d)", val);
 }

 #ifdef CONFIG_DDR_ECC
 static void wait_ddr_idle(void)
 {
 	/*
 	 * Controller idle status cannot be determined for Denali
 	 * DDR2 code. Just return here.
 	 */
 }

 static void program_ecc(u32 start_address,
 			u32 num_bytes,
 			u32 tlb_word2_i_value)
 {
 	u32 val;
 	u32 current_addr = start_address;
 	u32 size;
 	int bytes_remaining;

 	sync();
 	wait_ddr_idle();

 	/*
 	 * Because of 440EPx errata CHIP 11, we don't touch the last 256
 	 * bytes of SDRAM.
 	 */
 	bytes_remaining = num_bytes - CONFIG_SYS_MEM_TOP_HIDE;

 	/*
 	 * We have to write the ECC bytes by zeroing and flushing in smaller
 	 * steps, since the whole 256MByte takes too long for the external
 	 * watchdog.
 	 */
 	while (bytes_remaining > 0) {
 		size = min((64 << 20), bytes_remaining);

 		/* Write zero's to SDRAM */
 		dcbz_area(current_addr, size);

 		/* Write modified dcache lines back to memory */
 		clean_dcache_range(current_addr, current_addr + size);

 		current_addr += 64 << 20;
 		bytes_remaining -= 64 << 20;
 		WATCHDOG_RESET();
 	}

 	sync();
 	wait_ddr_idle();

 	/* Clear error status */
 	mfsdram(DDR0_00, val);
 	mtsdram(DDR0_00, val | DDR0_00_INT_ACK_ALL);

 	/* Set 'int_mask' parameter to functionnal value */
 	mfsdram(DDR0_01, val);
 	mtsdram(DDR0_01, ((val &~ DDR0_01_INT_MASK_MASK) | DDR0_01_INT_MASK_ALL_OFF));

 	sync();
 	wait_ddr_idle();
 }
 #endif

 /*************************************************************************
  *
  * initdram -- 440EPx's DDR controller is a DENALI Core
  *
  ************************************************************************/
 phys_size_t initdram (int board_type)
 {
 	/* CL=4 */
 	mtsdram(DDR0_02, 0x00000000);

 	mtsdram(DDR0_00, 0x0000190A);
 	mtsdram(DDR0_01, 0x01000000);
 	mtsdram(DDR0_03, 0x02040803); /* A suitable burst length was taken. CAS is right for our board */

 	mtsdram(DDR0_04, 0x0B030300);
 	mtsdram(DDR0_05, 0x02020308);
 	mtsdram(DDR0_06, 0x0003C812);
 	mtsdram(DDR0_07, 0x00090100);
 	mtsdram(DDR0_08, 0x03c80001);
 	mtsdram(DDR0_09, 0x00011D5F);
 	mtsdram(DDR0_10, 0x00000100);
 	mtsdram(DDR0_11, 0x000CC800);
 	mtsdram(DDR0_12, 0x00000003);
 	mtsdram(DDR0_14, 0x00000000);
 	mtsdram(DDR0_17, 0x1e000000);
 	mtsdram(DDR0_18, 0x1e1e1e1e);
 	mtsdram(DDR0_19, 0x1e1e1e1e);
 	mtsdram(DDR0_20, 0x0B0B0B0B);
 	mtsdram(DDR0_21, 0x0B0B0B0B);
 #ifdef CONFIG_DDR_ECC
 	mtsdram(DDR0_22, 0x00267F0B | DDR0_22_CTRL_RAW_ECC_ENABLE); /* enable ECC       */
 #else
 	mtsdram(DDR0_22, 0x00267F0B);
 #endif

 	mtsdram(DDR0_23, 0x01000000);
 	mtsdram(DDR0_24, 0x01010001);

 	mtsdram(DDR0_26, 0x2D93028A);
 	mtsdram(DDR0_27, 0x0784682B);

 	mtsdram(DDR0_28, 0x00000080);
 	mtsdram(DDR0_31, 0x00000000);
 	mtsdram(DDR0_42, 0x01000008);

 	mtsdram(DDR0_43, 0x050A0200);
 	mtsdram(DDR0_44, 0x00000005);
 	mtsdram(DDR0_02, 0x00000001); /* Activate the denali core */

 	denali_wait_for_dlllock();

 #if defined(CONFIG_DDR_DATA_EYE)
 	/* -----------------------------------------------------------+
 	 * Perform data eye search if requested.
 	 * ----------------------------------------------------------*/
 	program_tlb(0, CONFIG_SYS_SDRAM_BASE, CONFIG_SYS_MBYTES_SDRAM << 20,
 		    TLB_WORD2_I_ENABLE);
 	denali_core_search_data_eye();
 	remove_tlb(CONFIG_SYS_SDRAM_BASE, CONFIG_SYS_MBYTES_SDRAM << 20);
 #endif

 	/*
 	 * Program tlb entries for this size (dynamic)
 	 */
 	program_tlb(0, CONFIG_SYS_SDRAM_BASE, CONFIG_SYS_MBYTES_SDRAM << 20,
 		    MY_TLB_WORD2_I_ENABLE);

 	/*
 	 * Setup 2nd TLB with same physical address but different virtual address
 	 * with cache enabled. This is done for fast ECC generation.
 	 */
 	program_tlb(0, CONFIG_SYS_DDR_CACHED_ADDR, CONFIG_SYS_MBYTES_SDRAM << 20, 0);

 #ifdef CONFIG_DDR_ECC
 	/*
 	 * If ECC is enabled, initialize the parity bits.
 	 */
 	program_ecc(CONFIG_SYS_DDR_CACHED_ADDR, CONFIG_SYS_MBYTES_SDRAM << 20, 0);
 #endif

 	/*
 	 * Clear possible errors resulting from data-eye-search.
 	 * If not done, then we could get an interrupt later on when
 	 * exceptions are enabled.
 	 */
 	set_mcsr(get_mcsr());

 	return (CONFIG_SYS_MBYTES_SDRAM << 20);
 }
	/*
	* (C) Copyright 2006
	* Sylvie Gohl, AMCC/IBM, gohl.sylvie@fr.ibm.com
	* Jacqueline Pira-Ferriol, AMCC/IBM, jpira-ferriol@fr.ibm.com
	* Thierry Roman, AMCC/IBM, thierry_roman@fr.ibm.com
	* Alain Saurel, AMCC/IBM, alain.saurel@fr.ibm.com
	* Robert Snyder, AMCC/IBM, rob.snyder@fr.ibm.com
	*
	* (C) Copyright 2007-2008
	* Stefan Roese, DENX Software Engineering, sr@denx.de.
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License as
	* published by the Free Software Foundation; either version 2 of
	* the License, or (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	* MA 02111-1307 USA
	*/

	/* define DEBUG for debugging output (obviously ;-)) */
	#if 0
	#define DEBUG
	#endif

	#include <common.h>
	#include <asm/processor.h>
	#include <asm/mmu.h>
	#include <asm/io.h>
	#include <asm/cache.h>
	#include <ppc440.h>
	#include <watchdog.h>

	/*
	* This DDR2 setup code can dynamically setup the TLB entries for the DDR2 memory
	* region. Right now the cache should still be disabled in U-Boot because of the
	* EMAC driver, that need it's buffer descriptor to be located in non cached
	* memory.
	*
	* If at some time this restriction doesn't apply anymore, just define
	* CONFIG_SYS_ENABLE_SDRAM_CACHE in the board config file and this code should setup
	* everything correctly.
	*/
	#ifdef CONFIG_SYS_ENABLE_SDRAM_CACHE
	#define MY_TLB_WORD2_I_ENABLE 0 /* enable caching on SDRAM */
	#else
	#define MY_TLB_WORD2_I_ENABLE TLB_WORD2_I_ENABLE /* disable caching on SDRAM */
	#endif

	/*-----------------------------------------------------------------------------+
	* Prototypes
	-----------------------------------------------------------------------------/
	extern int denali_wait_for_dlllock(void);
	extern void denali_core_search_data_eye(void);
	extern void dcbz_area(u32 start_address, u32 num_bytes);

	static u32 is_ecc_enabled(void)
	{
	u32 val;

	mfsdram(DDR0_22, val);
	val &= DDR0_22_CTRL_RAW_MASK;
	if (val)
	return 1;
	else
	return 0;
	}

	void board_add_ram_info(int use_default)
	{
	PPC4xx_SYS_INFO board_cfg;
	u32 val;

	if (is_ecc_enabled())
	puts(" (ECC");
	else
	puts(" (ECC not");

	get_sys_info(&board_cfg);
	printf(" enabled, %ld MHz", (board_cfg.freqPLB * 2) / 1000000);

	mfsdram(DDR0_03, val);
	val = DDR0_03_CASLAT_DECODE(val);
	printf(", CL%d)", val);
	}

	#ifdef CONFIG_DDR_ECC
	static void wait_ddr_idle(void)
	{
	/*
	* Controller idle status cannot be determined for Denali
	* DDR2 code. Just return here.
	*/
	}

	static void program_ecc(u32 start_address,
	u32 num_bytes,
	u32 tlb_word2_i_value)
	{
	u32 val;
	u32 current_addr = start_address;
	u32 size;
	int bytes_remaining;

	sync();
	wait_ddr_idle();

	/*
	* Because of 440EPx errata CHIP 11, we don't touch the last 256
	* bytes of SDRAM.
	*/
	bytes_remaining = num_bytes - CONFIG_SYS_MEM_TOP_HIDE;

	/*
	* We have to write the ECC bytes by zeroing and flushing in smaller
	* steps, since the whole 256MByte takes too long for the external
	* watchdog.
	*/
	while (bytes_remaining > 0) {
	size = min((64 << 20), bytes_remaining);

	/* Write zero's to SDRAM */
	dcbz_area(current_addr, size);

	/* Write modified dcache lines back to memory */
	clean_dcache_range(current_addr, current_addr + size);

	current_addr += 64 << 20;
	bytes_remaining -= 64 << 20;
	WATCHDOG_RESET();
	}

	sync();
	wait_ddr_idle();

	/* Clear error status */
	mfsdram(DDR0_00, val);
	mtsdram(DDR0_00, val \| DDR0_00_INT_ACK_ALL);

	/* Set 'int_mask' parameter to functionnal value */
	mfsdram(DDR0_01, val);
	mtsdram(DDR0_01, ((val &~ DDR0_01_INT_MASK_MASK) \| DDR0_01_INT_MASK_ALL_OFF));

	sync();
	wait_ddr_idle();
	}
	#endif

	/*************************************************************************
	*
	* initdram -- 440EPx's DDR controller is a DENALI Core
	*
	************************************************************************/
	phys_size_t initdram (int board_type)
	{
	/* CL=4 */
	mtsdram(DDR0_02, 0x00000000);

	mtsdram(DDR0_00, 0x0000190A);
	mtsdram(DDR0_01, 0x01000000);
	mtsdram(DDR0_03, 0x02040803); /* A suitable burst length was taken. CAS is right for our board */

	mtsdram(DDR0_04, 0x0B030300);
	mtsdram(DDR0_05, 0x02020308);
	mtsdram(DDR0_06, 0x0003C812);
	mtsdram(DDR0_07, 0x00090100);
	mtsdram(DDR0_08, 0x03c80001);
	mtsdram(DDR0_09, 0x00011D5F);
	mtsdram(DDR0_10, 0x00000100);
	mtsdram(DDR0_11, 0x000CC800);
	mtsdram(DDR0_12, 0x00000003);
	mtsdram(DDR0_14, 0x00000000);
	mtsdram(DDR0_17, 0x1e000000);
	mtsdram(DDR0_18, 0x1e1e1e1e);
	mtsdram(DDR0_19, 0x1e1e1e1e);
	mtsdram(DDR0_20, 0x0B0B0B0B);
	mtsdram(DDR0_21, 0x0B0B0B0B);
	#ifdef CONFIG_DDR_ECC
	mtsdram(DDR0_22, 0x00267F0B \| DDR0_22_CTRL_RAW_ECC_ENABLE); /* enable ECC */
	#else
	mtsdram(DDR0_22, 0x00267F0B);
	#endif

	mtsdram(DDR0_23, 0x01000000);
	mtsdram(DDR0_24, 0x01010001);

	mtsdram(DDR0_26, 0x2D93028A);
	mtsdram(DDR0_27, 0x0784682B);

	mtsdram(DDR0_28, 0x00000080);
	mtsdram(DDR0_31, 0x00000000);
	mtsdram(DDR0_42, 0x01000008);

	mtsdram(DDR0_43, 0x050A0200);
	mtsdram(DDR0_44, 0x00000005);
	mtsdram(DDR0_02, 0x00000001); /* Activate the denali core */

	denali_wait_for_dlllock();

	#if defined(CONFIG_DDR_DATA_EYE)
	/* -----------------------------------------------------------+
	* Perform data eye search if requested.
	* ----------------------------------------------------------*/
	program_tlb(0, CONFIG_SYS_SDRAM_BASE, CONFIG_SYS_MBYTES_SDRAM << 20,
	TLB_WORD2_I_ENABLE);
	denali_core_search_data_eye();
	remove_tlb(CONFIG_SYS_SDRAM_BASE, CONFIG_SYS_MBYTES_SDRAM << 20);
	#endif

	/*
	* Program tlb entries for this size (dynamic)
	*/
	program_tlb(0, CONFIG_SYS_SDRAM_BASE, CONFIG_SYS_MBYTES_SDRAM << 20,
	MY_TLB_WORD2_I_ENABLE);

	/*
	* Setup 2nd TLB with same physical address but different virtual address
	* with cache enabled. This is done for fast ECC generation.
	*/
	program_tlb(0, CONFIG_SYS_DDR_CACHED_ADDR, CONFIG_SYS_MBYTES_SDRAM << 20, 0);

	#ifdef CONFIG_DDR_ECC
	/*
	* If ECC is enabled, initialize the parity bits.
	*/
	program_ecc(CONFIG_SYS_DDR_CACHED_ADDR, CONFIG_SYS_MBYTES_SDRAM << 20, 0);
	#endif

	/*
	* Clear possible errors resulting from data-eye-search.
	* If not done, then we could get an interrupt later on when
	* exceptions are enabled.
	*/
	set_mcsr(get_mcsr());

	return (CONFIG_SYS_MBYTES_SDRAM << 20);
	}