memory.c

Uboot源码,非常通用的bootloader.适用于各种平台的Linux系统引导.

/*
 * Copyright - Galileo technology.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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
 */

/*
 *
 * written or collected and sometimes rewritten by
 * Ingo Assmus <[e-mail]>
 *
 */


#include <common.h>
#include "../include/core.h"
#include "../include/memory.h"

/*******************************************************************************
* memoryGetBankBaseAddress - Returns the base address of a memory bank.
* DESCRIPTION:
*       This function returns the base address of one of the SDRAM抯 memory
*       banks. There are 4 memory banks and each one represents one DIMM side.
* INPUT:
*       MEMORY_BANK bank - Selects one of the four banks as defined in Memory.h.
* OUTPUT:
*       None.
* RETURN:
*       32 bit Memory bank base address.
*******************************************************************************/
static unsigned long memoryGetBankRegOffset (MEMORY_BANK bank)
{
	switch (bank) {
	case BANK0:
		return SCS_0_LOW_DECODE_ADDRESS;
	case BANK1:
		return SCS_1_LOW_DECODE_ADDRESS;
	case BANK2:
		return SCS_2_LOW_DECODE_ADDRESS;
	case BANK3:
		return SCS_3_LOW_DECODE_ADDRESS;

	}
	return SCS_0_LOW_DECODE_ADDRESS;	/* default value */
}

unsigned int memoryGetBankBaseAddress (MEMORY_BANK bank)
{
	unsigned int base;
	unsigned int regOffset = memoryGetBankRegOffset (bank);

	GT_REG_READ (regOffset, &base);
	base = base << 16;	/* MV6436x */
	return base;
}

/*******************************************************************************
* memoryGetDeviceBaseAddress - Returns the base address of a device.
* DESCRIPTION:
*       This function returns the base address of a device on the system. There
*       are 5 possible devices (0 - 4 and one boot device) as defined in
*       gtMemory.h. Each of the device parameters is maped to one of the CS
*       (Devices chip selects) base address register.
* INPUT:
*       device - Selects one of the five devices as defined in Memory.h.
* OUTPUT:
*       None.
* RETURN:
*       32 bit Device base address.
*
*******************************************************************************/
static unsigned int memoryGetDeviceRegOffset (DEVICE device)
{
	switch (device) {
	case DEVICE0:
		return CS_0_LOW_DECODE_ADDRESS;
	case DEVICE1:
		return CS_1_LOW_DECODE_ADDRESS;
	case DEVICE2:
		return CS_2_LOW_DECODE_ADDRESS;
	case DEVICE3:
		return CS_3_LOW_DECODE_ADDRESS;
	case BOOT_DEVICE:
		return BOOTCS_LOW_DECODE_ADDRESS;
	}
	return CS_0_LOW_DECODE_ADDRESS;	/* default value */
}

unsigned int memoryGetDeviceBaseAddress (DEVICE device)
{
	unsigned int regBase;
	unsigned int regOffset = memoryGetDeviceRegOffset (device);

	GT_REG_READ (regOffset, &regBase);

	regBase = regBase << 16;	/* MV6436x */
	return regBase;
}

/*******************************************************************************
* MemoryGetPciBaseAddr - Returns the base address of a PCI window.
* DESCRIPTION:
*       This function returns the base address of a PCI window. There are 5
*       possible PCI windows (memory 0 - 3 and one for I/O) for each PCI
*       interface as defined in gtMemory.h, used by the CPU's address decoding
*       mechanism.
*	New in MV6436x
* INPUT:
*       pciWindow - Selects one of the PCI windows as defined in Memory.h.
* OUTPUT:
*       None.
* RETURN:
*       32 bit PCI window base address.
*******************************************************************************/
unsigned int MemoryGetPciBaseAddr (PCI_MEM_WINDOW pciWindow)
{
	unsigned int baseAddrReg, base;

	switch (pciWindow) {
	case PCI_0_IO:
		baseAddrReg = PCI_0I_O_LOW_DECODE_ADDRESS;	/*PCI_0_IO_BASE_ADDR;  */
		break;
	case PCI_0_MEM0:
		baseAddrReg = PCI_0MEMORY0_LOW_DECODE_ADDRESS;	/*PCI_0_MEMORY0_BASE_ADDR; */
		break;
	case PCI_0_MEM1:
		baseAddrReg = PCI_0MEMORY1_LOW_DECODE_ADDRESS;	/*PCI_0_MEMORY1_BASE_ADDR; */
		break;
	case PCI_0_MEM2:
		baseAddrReg = PCI_0MEMORY2_LOW_DECODE_ADDRESS;	/*PCI_0_MEMORY2_BASE_ADDR;  */
		break;
	case PCI_0_MEM3:
		baseAddrReg = PCI_0MEMORY3_LOW_DECODE_ADDRESS;	/*PCI_0_MEMORY3_BASE_ADDR;  */
		break;
#ifdef INCLUDE_PCI_1
	case PCI_1_IO:
		baseAddrReg = PCI_1I_O_LOW_DECODE_ADDRESS;	/*PCI_1_IO_BASE_ADDR;  */
		break;
	case PCI_1_MEM0:
		baseAddrReg = PCI_1MEMORY0_LOW_DECODE_ADDRESS;	/*PCI_1_MEMORY0_BASE_ADDR; */
		break;
	case PCI_1_MEM1:
		baseAddrReg = PCI_1MEMORY1_LOW_DECODE_ADDRESS;	/*PCI_1_MEMORY1_BASE_ADDR;  */
		break;
	case PCI_1_MEM2:
		baseAddrReg = PCI_1MEMORY2_LOW_DECODE_ADDRESS;	/*PCI_1_MEMORY2_BASE_ADDR;  */
		break;
	case PCI_1_MEM3:
		baseAddrReg = PCI_1MEMORY3_LOW_DECODE_ADDRESS;	/*PCI_1_MEMORY3_BASE_ADDR; */
		break;
#endif /* INCLUDE_PCI_1 */
	default:
		return 0xffffffff;
	}
	GT_REG_READ (baseAddrReg, &base);
	return (base << 16);
}

/*******************************************************************************
* memoryGetBankSize - Returns the size of a memory bank.
* DESCRIPTION:
*       This function returns the size of memory bank as described in
*       'gtMemoryGetBankBaseAddress' function.
* INPUT:
*       bank - Selects one of the four banks as defined in Memory.h.
* OUTPUT:
*       None.
* RETURN:
*       32 bit size memory bank size or 0 for a closed or non populated bank.
*
*******************************************************************************/
unsigned int memoryGetBankSize (MEMORY_BANK bank)
{
	unsigned int sizeReg, size;
	MEMORY_WINDOW window;

	switch (bank) {
	case BANK0:
		sizeReg = SCS_0_HIGH_DECODE_ADDRESS;	/* CS_0_SIZE; */
		window = CS_0_WINDOW;
		break;
	case BANK1:
		sizeReg = SCS_1_HIGH_DECODE_ADDRESS;	/* CS_1_SIZE; */
		window = CS_1_WINDOW;
		break;
	case BANK2:
		sizeReg = SCS_2_HIGH_DECODE_ADDRESS;	/* CS_2_SIZE; */
		window = CS_2_WINDOW;
		break;
	case BANK3:
		sizeReg = SCS_3_HIGH_DECODE_ADDRESS;	/* CS_3_SIZE; */
		window = CS_3_WINDOW;
		break;
	default:
		return 0;
		break;
	}
	/* If the window is closed, a size of 0 is returned */
	if (MemoryGetMemWindowStatus (window) != MEM_WINDOW_ENABLED)
		return 0;
	GT_REG_READ (sizeReg, &size);
	size = ((size << 16) | 0xffff) + 1;
	return size;
}

/*******************************************************************************
* memoryGetDeviceSize - Returns the size of a device memory space.
* DESCRIPTION:
*       This function returns the memory space size of a given device.
* INPUT:
*       device - Selects one of the five devices as defined in Memory.h.
* OUTPUT:
*       None.
* RETURN:
*       32 bit size of a device memory space.
*******************************************************************************/
unsigned int memoryGetDeviceSize (DEVICE device)
{
	unsigned int sizeReg, size;
	MEMORY_WINDOW window;

	switch (device) {
	case DEVICE0:
		sizeReg = CS_0_HIGH_DECODE_ADDRESS;	/*DEV_CS0_SIZE; */
		window = DEVCS_0_WINDOW;
		break;
	case DEVICE1:
		sizeReg = CS_1_HIGH_DECODE_ADDRESS;	/*DEV_CS1_SIZE; */
		window = DEVCS_1_WINDOW;
		break;
	case DEVICE2:
		sizeReg = CS_2_HIGH_DECODE_ADDRESS;	/*DEV_CS2_SIZE; */
		window = DEVCS_2_WINDOW;
		break;
	case DEVICE3:
		sizeReg = CS_3_HIGH_DECODE_ADDRESS;	/*DEV_CS3_SIZE; */
		window = DEVCS_3_WINDOW;
		break;
	case BOOT_DEVICE:
		sizeReg = BOOTCS_HIGH_DECODE_ADDRESS;	/*BOOTCS_SIZE; */
		window = BOOT_CS_WINDOW;
		break;
	default:
		return 0;
		break;
	}
	/* If the window is closed, a size of 0 is returned */
	if (MemoryGetMemWindowStatus (window) != MEM_WINDOW_ENABLED)
		return 0;
	GT_REG_READ (sizeReg, &size);
	size = ((size << 16) | 0xffff) + 1;
	return size;
}

/*******************************************************************************
* MemoryGetPciWindowSize - Returns the size of a PCI memory window.
* DESCRIPTION:
*       This function returns the size of a PCI window.
* INPUT:
*       pciWindow - Selects one of the PCI memory windows as defined in
*       Memory.h.
* OUTPUT:
*       None.
* RETURN:
*       32 bit size of a PCI memory window.
*******************************************************************************/
unsigned int MemoryGetPciWindowSize (PCI_MEM_WINDOW pciWindow)
{
	unsigned int sizeReg, size;

	switch (pciWindow) {
	case PCI_0_IO:
		sizeReg = PCI_0I_O_HIGH_DECODE_ADDRESS;	/*PCI_0_IO_SIZE; */
		break;
	case PCI_0_MEM0:
		sizeReg = PCI_0MEMORY0_HIGH_DECODE_ADDRESS;	/*PCI_0_MEMORY0_SIZE; */
		break;
	case PCI_0_MEM1:
		sizeReg = PCI_0MEMORY1_HIGH_DECODE_ADDRESS;	/*PCI_0_MEMORY1_SIZE; */
		break;
	case PCI_0_MEM2:
		sizeReg = PCI_0MEMORY2_HIGH_DECODE_ADDRESS;	/*PCI_0_MEMORY2_SIZE; */
		break;
	case PCI_0_MEM3:
		sizeReg = PCI_0MEMORY3_HIGH_DECODE_ADDRESS;	/*PCI_0_MEMORY3_SIZE; */
		break;
#ifdef INCLUDE_PCI_1
	case PCI_1_IO:
		sizeReg = PCI_1I_O_HIGH_DECODE_ADDRESS;	/*PCI_1_IO_SIZE; */
		break;
	case PCI_1_MEM0:
		sizeReg = PCI_1MEMORY0_HIGH_DECODE_ADDRESS;	/*PCI_1_MEMORY0_SIZE; */
		break;
	case PCI_1_MEM1:
		sizeReg = PCI_1MEMORY1_HIGH_DECODE_ADDRESS;	/*PCI_1_MEMORY1_SIZE;  */
		break;
	case PCI_1_MEM2:
		sizeReg = PCI_1MEMORY2_HIGH_DECODE_ADDRESS;	/*PCI_1_MEMORY2_SIZE;  */
		break;
	case PCI_1_MEM3:
		sizeReg = PCI_1MEMORY3_HIGH_DECODE_ADDRESS;	/*PCI_1_MEMORY3_SIZE; */
		break;
#endif /* INCLUDE_PCI_1 */
	default:
		return 0x0;
	}
	/* If the memory window is disabled, retrun size = 0 */
	if (MemoryGetMemWindowStatus (PCI_0_IO_WINDOW << pciWindow)
	    == MEM_WINDOW_DISABLED)
		return 0;
	GT_REG_READ (sizeReg, &size);
	size = ((size << 16) | 0xffff) + 1;
	return size;
}

/*******************************************************************************
* memoryGetDeviceWidth - Returns the width of a given device.
* DESCRIPTION:
*       The MV's device interface supports up to 32 Bit wide devices. A device
*       can have a  1, 2, 4 or 8 Bytes data width. This function returns the
*       width of a device as defined by the user or the operating system.
* INPUT:
*       device - Selects one of the five devices as defined in Memory.h.
* OUTPUT:
*       None.
* RETURN:
*       Device width in Bytes (1,2,4 or 8), 0 if error had occurred.
*******************************************************************************/
unsigned int memoryGetDeviceWidth (DEVICE device)
{
	unsigned int width;
	unsigned int regValue;

	GT_REG_READ (DEVICE_BANK0PARAMETERS + device * 4, &regValue);
	width = (regValue & (BIT20 | BIT21)) >> 20;
	return (BIT0 << width);
}

/*******************************************************************************
* memoryMapBank - Set new base address and size for one of the memory
*                         banks.
*
* DESCRIPTION:
*       The CPU interface address decoding map consists of 21 address windows
*       for the different devices (e.g. CS[3:0] ,PCI0 Mem 0/1/2/3...). Each
*       window can have a minimum of 1Mbytes of address space, and up to 4Gbyte
*       space. Each address window is defined by two registers - base and size.
*       The CPU address is compared with the values in the various CPU windows
*       until a match is found and the address is than targeted to that window.
*       This function sets new base and size for one the memory banks
*       (CS0 - CS3). It is the programmer`s responsibility to make sure that
*       there are no conflicts with other memory spaces. When two memory spaces
*       overlap, the MV抯 behavior is not defined .If a bank needs to be closed,
*       set the 抌ankLength