board/amirix/ap1000/powerspan.c - platform/external/u-boot - Gitiles

 /**
  * @file powerspan.c Source file for PowerSpan II code.
  */

 /*
  * (C) Copyright 2005
  * AMIRIX Systems Inc.
  *
  * 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
  */

 #include <common.h>
 #include <command.h>
 #include <asm/processor.h>
 #include "powerspan.h"
 #define tolower(x) x
 #include "ap1000.h"

 #ifdef INCLUDE_PCI

 /** Write one byte with byte swapping.
   * @param  addr [IN] the address to write to
   * @param  val  [IN] the value to write
   */
 void write1 (unsigned long addr, unsigned char val)
 {
 	volatile unsigned char *p = (volatile unsigned char *) addr;

 #ifdef VERBOSITY
 	if (gVerbosityLevel > 1) {
 		printf ("write1: addr=%08x val=%02x\n", addr, val);
 	}
 #endif
 	*p = val;
 	PSII_SYNC ();
 }

 /** Read one byte with byte swapping.
   * @param  addr  [IN] the address to read from
   * @return the value at addr
   */
 unsigned char read1 (unsigned long addr)
 {
 	unsigned char val;
 	volatile unsigned char *p = (volatile unsigned char *) addr;

 	val = *p;
 	PSII_SYNC ();
 #ifdef VERBOSITY
 	if (gVerbosityLevel > 1) {
 		printf ("read1: addr=%08x val=%02x\n", addr, val);
 	}
 #endif
 	return val;
 }

 /** Write one 2-byte word with byte swapping.
   * @param  addr  [IN] the address to write to
   * @param  val   [IN] the value to write
   */
 void write2 (unsigned long addr, unsigned short val)
 {
 	volatile unsigned short *p = (volatile unsigned short *) addr;

 #ifdef VERBOSITY
 	if (gVerbosityLevel > 1) {
 		printf ("write2: addr=%08x val=%04x -> *p=%04x\n", addr, val,
 			((val & 0xFF00) >> 8) | ((val & 0x00FF) << 8));
 	}
 #endif
 	*p = ((val & 0xFF00) >> 8) | ((val & 0x00FF) << 8);
 	PSII_SYNC ();
 }

 /** Read one 2-byte word with byte swapping.
   * @param  addr  [IN] the address to read from
   * @return the value at addr
   */
 unsigned short read2 (unsigned long addr)
 {
 	unsigned short val;
 	volatile unsigned short *p = (volatile unsigned short *) addr;

 	val = *p;
 	val = ((val & 0xFF00) >> 8) | ((val & 0x00FF) << 8);
 	PSII_SYNC ();
 #ifdef VERBOSITY
 	if (gVerbosityLevel > 1) {
 		printf ("read2: addr=%08x *p=%04x -> val=%04x\n", addr, *p,
 			val);
 	}
 #endif
 	return val;
 }

 /** Write one 4-byte word with byte swapping.
   * @param  addr  [IN] the address to write to
   * @param  val   [IN] the value to write
   */
 void write4 (unsigned long addr, unsigned long val)
 {
 	volatile unsigned long *p = (volatile unsigned long *) addr;

 #ifdef VERBOSITY
 	if (gVerbosityLevel > 1) {
 		printf ("write4: addr=%08x val=%08x -> *p=%08x\n", addr, val,
 			((val & 0xFF000000) >> 24) |
 			((val & 0x000000FF) << 24) |
 			((val & 0x00FF0000) >>  8) |
 			((val & 0x0000FF00) <<  8));
 	}
 #endif
 	*p = ((val & 0xFF000000) >> 24) | ((val & 0x000000FF) << 24) |
 		((val & 0x00FF0000) >> 8) | ((val & 0x0000FF00) << 8);
 	PSII_SYNC ();
 }

 /** Read one 4-byte word with byte swapping.
   * @param  addr  [IN] the address to read from
   * @return the value at addr
   */
 unsigned long read4 (unsigned long addr)
 {
 	unsigned long val;
 	volatile unsigned long *p = (volatile unsigned long *) addr;

 	val = *p;
 	val = ((val & 0xFF000000) >> 24) | ((val & 0x000000FF) << 24) |
 		((val & 0x00FF0000) >> 8) | ((val & 0x0000FF00) << 8);
 	PSII_SYNC ();
 #ifdef VERBOSITY
 	if (gVerbosityLevel > 1) {
 		printf ("read4: addr=%08x *p=%08x -> val=%08x\n", addr, *p,
 			val);
 	}
 #endif
 	return val;
 }

 int PCIReadConfig (int bus, int dev, int fn, int reg, int width,
 		   unsigned long *val)
 {
 	unsigned int conAdrVal;
 	unsigned int conDataReg = REG_CONFIG_DATA;
 	unsigned int status;
 	int ret_val = 0;


 	/* DEST bit hardcoded to 1: local pci is PCI-2 */
 	/* TYPE bit is hardcoded to 1: all config cycles are local */
 	conAdrVal = (1 << 24)
 		| ((bus & 0xFF) << 16)
 		| ((dev & 0xFF) << 11)
 		| ((fn & 0x07) << 8)
 		| (reg & 0xFC);

 	/* clear any pending master aborts */
 	write4 (REG_P1_CSR, CLEAR_MASTER_ABORT);

 	/* Load the conAdrVal value first, then read from pb_conf_data */
 	write4 (REG_CONFIG_ADDRESS, conAdrVal);
 	PSII_SYNC ();


 	/* Note: documentation does not match the pspan library code */
 	/* Note: *pData comes back as -1 if device is not present */
 	switch (width) {
 	case 4:
 		*(unsigned int *) val = read4 (conDataReg);
 		break;
 	case 2:
 		*(unsigned short *) val = read2 (conDataReg);
 		break;
 	case 1:
 		*(unsigned char *) val = read1 (conDataReg);
 		break;
 	default:
 		ret_val = ILLEGAL_REG_OFFSET;
 		break;
 	}
 	PSII_SYNC ();

 	/* clear any pending master aborts */
 	status = read4 (REG_P1_CSR);
 	if (status & CLEAR_MASTER_ABORT) {
 		ret_val = NO_DEVICE_FOUND;
 		write4 (REG_P1_CSR, CLEAR_MASTER_ABORT);
 	}

 	return ret_val;
 }


 int PCIWriteConfig (int bus, int dev, int fn, int reg, int width,
 		    unsigned long val)
 {
 	unsigned int conAdrVal;
 	unsigned int conDataReg = REG_CONFIG_DATA;
 	unsigned int status;
 	int ret_val = 0;


 	/* DEST bit hardcoded to 1: local pci is PCI-2 */
 	/* TYPE bit is hardcoded to 1: all config cycles are local */
 	conAdrVal = (1 << 24)
 		| ((bus & 0xFF) << 16)
 		| ((dev & 0xFF) << 11)
 		| ((fn & 0x07) << 8)
 		| (reg & 0xFC);

 	/* clear any pending master aborts */
 	write4 (REG_P1_CSR, CLEAR_MASTER_ABORT);

 	/* Load the conAdrVal value first, then read from pb_conf_data */
 	write4 (REG_CONFIG_ADDRESS, conAdrVal);
 	PSII_SYNC ();


 	/* Note: documentation does not match the pspan library code */
 	/* Note: *pData comes back as -1 if device is not present */
 	switch (width) {
 	case 4:
 		write4 (conDataReg, val);
 		break;
 	case 2:
 		write2 (conDataReg, val);
 		break;
 	case 1:
 		write1 (conDataReg, val);
 		break;
 	default:
 		ret_val = ILLEGAL_REG_OFFSET;
 		break;
 	}
 	PSII_SYNC ();

 	/* clear any pending master aborts */
 	status = read4 (REG_P1_CSR);
 	if (status & CLEAR_MASTER_ABORT) {
 		ret_val = NO_DEVICE_FOUND;
 		write4 (REG_P1_CSR, CLEAR_MASTER_ABORT);
 	}

 	return ret_val;
 }


 int pci_read_config_byte (int bus, int dev, int fn, int reg,
 			  unsigned char *val)
 {
 	unsigned long read_val;
 	int ret_val;

 	ret_val = PCIReadConfig (bus, dev, fn, reg, 1, &read_val);
 	*val = read_val & 0xFF;

 	return ret_val;
 }

 int pci_write_config_byte (int bus, int dev, int fn, int reg,
 			   unsigned char val)
 {
 	return PCIWriteConfig (bus, dev, fn, reg, 1, val);
 }

 int pci_read_config_word (int bus, int dev, int fn, int reg,
 			  unsigned short *val)
 {
 	unsigned long read_val;
 	int ret_val;

 	ret_val = PCIReadConfig (bus, dev, fn, reg, 2, &read_val);
 	*val = read_val & 0xFFFF;

 	return ret_val;
 }

 int pci_write_config_word (int bus, int dev, int fn, int reg,
 			   unsigned short val)
 {
 	return PCIWriteConfig (bus, dev, fn, reg, 2, val);
 }

 int pci_read_config_dword (int bus, int dev, int fn, int reg,
 			   unsigned long *val)
 {
 	return PCIReadConfig (bus, dev, fn, reg, 4, val);
 }

 int pci_write_config_dword (int bus, int dev, int fn, int reg,
 			    unsigned long val)
 {
 	return PCIWriteConfig (bus, dev, fn, reg, 4, val);
 }

 #endif /* INCLUDE_PCI */

 int I2CAccess (unsigned char theI2CAddress, unsigned char theDevCode,
 	       unsigned char theChipSel, unsigned char *theValue, int RWFlag)
 {
 	int ret_val = 0;
 	unsigned int reg_value;

 	reg_value = PowerSpanRead (REG_I2C_CSR);

 	if (reg_value & I2C_CSR_ACT) {
 		printf ("Error: I2C busy\n");
 		ret_val = I2C_BUSY;
 	} else {
 		reg_value = ((theI2CAddress & 0xFF) << 24)
 			| ((theDevCode & 0x0F) << 12)
 			| ((theChipSel & 0x07) << 9)
 			| I2C_CSR_ERR;
 		if (RWFlag == I2C_WRITE) {
 			reg_value |= I2C_CSR_RW | ((*theValue & 0xFF) << 16);
 		}

 		PowerSpanWrite (REG_I2C_CSR, reg_value);
 		udelay (1);

 		do {
 			reg_value = PowerSpanRead (REG_I2C_CSR);

 			if ((reg_value & I2C_CSR_ACT) == 0) {
 				if (reg_value & I2C_CSR_ERR) {
 					ret_val = I2C_ERR;
 				} else {
 					*theValue =
 						(reg_value & I2C_CSR_DATA) >>
 						16;
 				}
 			}
 		} while (reg_value & I2C_CSR_ACT);
 	}

 	return ret_val;
 }

 int EEPROMRead (unsigned char theI2CAddress, unsigned char *theValue)
 {
 	return I2CAccess (theI2CAddress, I2C_EEPROM_DEV, I2C_EEPROM_CHIP_SEL,
 			  theValue, I2C_READ);
 }

 int EEPROMWrite (unsigned char theI2CAddress, unsigned char theValue)
 {
 	return I2CAccess (theI2CAddress, I2C_EEPROM_DEV, I2C_EEPROM_CHIP_SEL,
 			  &theValue, I2C_WRITE);
 }

 int do_eeprom (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 {
 	char cmd;
 	int ret_val = 0;
 	unsigned int address = 0;
 	unsigned char value = 1;
 	unsigned char read_value;
 	int ii;
 	int error = 0;
 	unsigned char *mem_ptr;
 	unsigned char default_eeprom[] = EEPROM_DEFAULT;

 	if (argc < 2) {
 		goto usage;
 	}

 	cmd = argv[1][0];
 	if (argc > 2) {
 		address = simple_strtoul (argv[2], NULL, 16);
 		if (argc > 3) {
 			value = simple_strtoul (argv[3], NULL, 16) & 0xFF;
 		}
 	}

 	switch (cmd) {
 	case 'r':
 		if (address > 256) {
 			printf ("Illegal Address\n");
 			goto usage;
 		}
 		printf ("@0x%x: ", address);
 		for (ii = 0; ii < value; ii++) {
 			if (EEPROMRead (address + ii, &read_value) !=
 			    0) {
 				printf ("Read Error\n");
 			} else {
 				printf ("0x%02x ", read_value);
 			}

 			if (((ii + 1) % 16) == 0) {
 				printf ("\n");
 			}
 		}
 		printf ("\n");
 		break;
 	case 'w':
 		if (address > 256) {
 			printf ("Illegal Address\n");
 			goto usage;
 		}
 		if (argc < 4) {
 			goto usage;
 		}
 		if (EEPROMWrite (address, value) != 0) {
 			printf ("Write Error\n");
 		}
 		break;
 	case 'g':
 		if (argc != 3) {
 			goto usage;
 		}
 		mem_ptr = (unsigned char *) address;
 		for (ii = 0; ((ii < EEPROM_LENGTH) && (error == 0));
 		     ii++) {
 			if (EEPROMRead (ii, &read_value) != 0) {
 				printf ("Read Error\n");
 				error = 1;
 			} else {
 				*mem_ptr = read_value;
 				mem_ptr++;
 			}
 		}
 		break;
 	case 'p':
 		if (argc != 3) {
 			goto usage;
 		}
 		mem_ptr = (unsigned char *) address;
 		for (ii = 0; ((ii < EEPROM_LENGTH) && (error == 0));
 		     ii++) {
 			if (EEPROMWrite (ii, *mem_ptr) != 0) {
 				printf ("Write Error\n");
 				error = 1;
 			}

 			mem_ptr++;
 		}
 		break;
 	case 'd':
 		if (argc != 2) {
 			goto usage;
 		}
 		for (ii = 0; ((ii < EEPROM_LENGTH) && (error == 0));
 		     ii++) {
 			if (EEPROMWrite (ii, default_eeprom[ii]) != 0) {
 				printf ("Write Error\n");
 				error = 1;
 			}
 		}
 		break;
 	default:
 		goto usage;
 	}

 	goto done;
       usage:
 	printf ("Usage:\n%s\n", cmdtp->help);

       done:
 	return ret_val;

 }

 U_BOOT_CMD (eeprom, 4, 0, do_eeprom,
 	    "read/write/copy to/from the PowerSpan II eeprom",
 	    "eeprom r OFF [NUM]\n"
 	    "    - read NUM words starting at OFF\n"
 	    "eeprom w OFF VAL\n"
 	    "    - write word VAL at offset OFF\n"
 	    "eeprom g ADD\n"
 	    "    - store contents of eeprom at address ADD\n"
 	    "eeprom p ADD\n"
 	    "    - put data stored at address ADD into the eeprom\n"
 	    "eeprom d\n" "    - return eeprom to default contents\n");

 unsigned int PowerSpanRead (unsigned int theOffset)
 {
 	volatile unsigned int *ptr =
 		(volatile unsigned int *) (PSPAN_BASEADDR + theOffset);
 	unsigned int ret_val;

 #ifdef VERBOSITY
 	if (gVerbosityLevel > 1) {
 		printf ("PowerSpanRead: offset=%08x ", theOffset);
 	}
 #endif
 	ret_val = *ptr;
 	PSII_SYNC ();

 #ifdef VERBOSITY
 	if (gVerbosityLevel > 1) {
 		printf ("value=%08x\n", ret_val);
 	}
 #endif

 	return ret_val;
 }

 void PowerSpanWrite (unsigned int theOffset, unsigned int theValue)
 {
 	volatile unsigned int *ptr =
 		(volatile unsigned int *) (PSPAN_BASEADDR + theOffset);
 #ifdef VERBOSITY
 	if (gVerbosityLevel > 1) {
 		printf ("PowerSpanWrite: offset=%08x val=%02x\n", theOffset,
 			theValue);
 	}
 #endif
 	*ptr = theValue;
 	PSII_SYNC ();
 }

 /**
  * Sets the indicated bits in the indicated register.
  * @param theOffset [IN] the register to access.
  * @param theMask   [IN] bits set in theMask will be set in the register.
  */
 void PowerSpanSetBits (unsigned int theOffset, unsigned int theMask)
 {
 	volatile unsigned int *ptr =
 		(volatile unsigned int *) (PSPAN_BASEADDR + theOffset);
 	unsigned int register_value;

 #ifdef VERBOSITY
 	if (gVerbosityLevel > 1) {
 		printf ("PowerSpanSetBits: offset=%08x mask=%02x\n",
 			theOffset, theMask);
 	}
 #endif
 	register_value = *ptr;
 	PSII_SYNC ();

 	register_value |= theMask;
 	*ptr = register_value;
 	PSII_SYNC ();
 }

 /**
  * Clears the indicated bits in the indicated register.
  * @param theOffset [IN] the register to access.
  * @param theMask   [IN] bits set in theMask will be cleared in the register.
  */
 void PowerSpanClearBits (unsigned int theOffset, unsigned int theMask)
 {
 	volatile unsigned int *ptr =
 		(volatile unsigned int *) (PSPAN_BASEADDR + theOffset);
 	unsigned int register_value;

 #ifdef VERBOSITY
 	if (gVerbosityLevel > 1) {
 		printf ("PowerSpanClearBits: offset=%08x mask=%02x\n",
 			theOffset, theMask);
 	}
 #endif
 	register_value = *ptr;
 	PSII_SYNC ();

 	register_value &= ~theMask;
 	*ptr = register_value;
 	PSII_SYNC ();
 }

 /**
  * Configures a slave image on the local bus, based on the parameters and some hardcoded system values.
  * Slave Images are images that cause the PowerSpan II to be a master on the PCI bus.  Thus, they
  *  are outgoing from the standpoint of the local bus.
  * @param theImageIndex    [IN] the PowerSpan II image to set (assumed to be 0-7).
  * @param theBlockSize     [IN] the block size of the image (as used by PowerSpan II: PB_SIx_CTL[BS]).
  * @param theMemIOFlag     [IN] if PX_TGT_USE_MEM_IO, this image will have the MEM_IO bit set.
  * @param theEndianness    [IN] the endian bits for the image (already shifted, use defines).
  * @param theLocalBaseAddr [IN] the Local address for the image (assumed to be valid with provided block size).
  * @param thePCIBaseAddr   [IN] the PCI address for the image (assumed to be valid with provided block size).
  */
 int SetSlaveImage (int theImageIndex, unsigned int theBlockSize,
 		   int theMemIOFlag, int theEndianness,
 		   unsigned int theLocalBaseAddr, unsigned int thePCIBaseAddr)
 {
 	unsigned int reg_offset = theImageIndex * PB_SLAVE_IMAGE_OFF;
 	unsigned int reg_value = 0;

 	/* Make sure that the Slave Image is disabled */
 	PowerSpanClearBits ((REGS_PB_SLAVE_CSR + reg_offset),
 			    PB_SLAVE_CSR_IMG_EN);

 	/* Setup the mask required for requested PB Slave Image configuration */
 	reg_value = PB_SLAVE_CSR_TA_EN | theEndianness | (theBlockSize << 24);
 	if (theMemIOFlag == PB_SLAVE_USE_MEM_IO) {
 		reg_value |= PB_SLAVE_CSR_MEM_IO;
 	}

 	/* hardcoding the following:
 	   TA_EN = 1
 	   MD_EN = 0
 	   MODE  = 0
 	   PRKEEP = 0
 	   RD_AMT = 0
 	 */
 	PowerSpanWrite ((REGS_PB_SLAVE_CSR + reg_offset), reg_value);

 	/* these values are not checked by software */
 	PowerSpanWrite ((REGS_PB_SLAVE_BADDR + reg_offset), theLocalBaseAddr);
 	PowerSpanWrite ((REGS_PB_SLAVE_TADDR + reg_offset), thePCIBaseAddr);

 	/* Enable the Slave Image */
 	PowerSpanSetBits ((REGS_PB_SLAVE_CSR + reg_offset),
 			  PB_SLAVE_CSR_IMG_EN);

 	return 0;
 }

 /**
  * Configures a target image on the local bus, based on the parameters and some hardcoded system values.
  * Target Images are used when the PowerSpan II is acting as a target for an access.  Thus, they
  *  are incoming from the standpoint of the local bus.
  * In order to behave better on the host PCI bus, if thePCIBaseAddr is NULL (0x00000000), then the PCI
  *  base address will not be updated; makes sense given that the hosts own memory should be mapped to
  *  PCI address 0x00000000.
  * @param theImageIndex    [IN] the PowerSpan II image to set.
  * @param theBlockSize     [IN] the block size of the image (as used by PowerSpan II: Px_TIx_CTL[BS]).
  * @param theMemIOFlag     [IN] if PX_TGT_USE_MEM_IO, this image will have the MEM_IO bit set.
  * @param theEndianness    [IN] the endian bits for the image (already shifted, use defines).
  * @param theLocalBaseAddr [IN] the Local address for the image (assumed to be valid with provided block size).
  * @param thePCIBaseAddr   [IN] the PCI address for the image (assumed to be valid with provided block size).
  */
 int SetTargetImage (int theImageIndex, unsigned int theBlockSize,
 		    int theMemIOFlag, int theEndianness,
 		    unsigned int theLocalBaseAddr,
 		    unsigned int thePCIBaseAddr)
 {
 	unsigned int csr_reg_offset = theImageIndex * P1_TGT_IMAGE_OFF;
 	unsigned int pci_reg_offset = theImageIndex * P1_BST_OFF;
 	unsigned int reg_value = 0;

 	/* Make sure that the Slave Image is disabled */
 	PowerSpanClearBits ((REGS_P1_TGT_CSR + csr_reg_offset),
 			    PB_SLAVE_CSR_IMG_EN);

 	/* Setup the mask required for requested PB Slave Image configuration */
 	reg_value =
 		PX_TGT_CSR_TA_EN | PX_TGT_CSR_BAR_EN | (theBlockSize << 24) |
 		PX_TGT_CSR_RTT_READ | PX_TGT_CSR_WTT_WFLUSH | theEndianness;
 	if (theMemIOFlag == PX_TGT_USE_MEM_IO) {
 		reg_value |= PX_TGT_MEM_IO;
 	}

 	/* hardcoding the following:
 	   TA_EN = 1
 	   BAR_EN = 1
 	   MD_EN = 0
 	   MODE  = 0
 	   DEST  = 0
 	   RTT = 01010
 	   GBL = 0
 	   CI = 0
 	   WTT = 00010
 	   PRKEEP = 0
 	   MRA = 0
 	   RD_AMT = 0
 	 */
 	PowerSpanWrite ((REGS_P1_TGT_CSR + csr_reg_offset), reg_value);

 	PowerSpanWrite ((REGS_P1_TGT_TADDR + csr_reg_offset),
 			theLocalBaseAddr);

 	if (thePCIBaseAddr != (unsigned int) NULL) {
 		PowerSpanWrite ((REGS_P1_BST + pci_reg_offset),
 				thePCIBaseAddr);
 	}

 	/* Enable the Slave Image */
 	PowerSpanSetBits ((REGS_P1_TGT_CSR + csr_reg_offset),
 			  PB_SLAVE_CSR_IMG_EN);

 	return 0;
 }

 int do_bridge (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 {
 	char cmd;
 	int ret_val = 1;
 	unsigned int image_index;
 	unsigned int block_size;
 	unsigned int mem_io;
 	unsigned int local_addr;
 	unsigned int pci_addr;
 	int endianness;

 	if (argc != 8) {
 		goto usage;
 	}

 	cmd = argv[1][0];
 	image_index = simple_strtoul (argv[2], NULL, 16);
 	block_size = simple_strtoul (argv[3], NULL, 16);
 	mem_io = simple_strtoul (argv[4], NULL, 16);
 	endianness = argv[5][0];
 	local_addr = simple_strtoul (argv[6], NULL, 16);
 	pci_addr = simple_strtoul (argv[7], NULL, 16);


 	switch (cmd) {
 	case 'i':
 		if (tolower (endianness) == 'b') {
 			endianness = PX_TGT_CSR_BIG_END;
 		} else if (tolower (endianness) == 'l') {
 			endianness = PX_TGT_CSR_TRUE_LEND;
 		} else {
 			goto usage;
 		}
 		SetTargetImage (image_index, block_size, mem_io,
 				endianness, local_addr, pci_addr);
 		break;
 	case 'o':
 		if (tolower (endianness) == 'b') {
 			endianness = PB_SLAVE_CSR_BIG_END;
 		} else if (tolower (endianness) == 'l') {
 			endianness = PB_SLAVE_CSR_TRUE_LEND;
 		} else {
 			goto usage;
 		}
 		SetSlaveImage (image_index, block_size, mem_io,
 			       endianness, local_addr, pci_addr);
 		break;
 	default:
 		goto usage;
 	}

 	goto done;
 usage:
 	printf ("Usage:\n%s\n", cmdtp->help);

 done:
 	return ret_val;
 }
	/**
	* @file powerspan.c Source file for PowerSpan II code.
	*/

	/*
	* (C) Copyright 2005
	* AMIRIX Systems Inc.
	*
	* 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
	*/

	#include <common.h>
	#include <command.h>
	#include <asm/processor.h>
	#include "powerspan.h"
	#define tolower(x) x
	#include "ap1000.h"

	#ifdef INCLUDE_PCI

	/** Write one byte with byte swapping.
	* @param addr [IN] the address to write to
	* @param val [IN] the value to write
	*/
	void write1 (unsigned long addr, unsigned char val)
	{
	volatile unsigned char p = (volatile unsigned char ) addr;

	#ifdef VERBOSITY
	if (gVerbosityLevel > 1) {
	printf ("write1: addr=%08x val=%02x\n", addr, val);
	}
	#endif
	*p = val;
	PSII_SYNC ();
	}

	/** Read one byte with byte swapping.
	* @param addr [IN] the address to read from
	* @return the value at addr
	*/
	unsigned char read1 (unsigned long addr)
	{
	unsigned char val;
	volatile unsigned char p = (volatile unsigned char ) addr;

	val = *p;
	PSII_SYNC ();
	#ifdef VERBOSITY
	if (gVerbosityLevel > 1) {
	printf ("read1: addr=%08x val=%02x\n", addr, val);
	}
	#endif
	return val;
	}

	/** Write one 2-byte word with byte swapping.
	* @param addr [IN] the address to write to
	* @param val [IN] the value to write
	*/
	void write2 (unsigned long addr, unsigned short val)
	{
	volatile unsigned short p = (volatile unsigned short ) addr;

	#ifdef VERBOSITY
	if (gVerbosityLevel > 1) {
	printf ("write2: addr=%08x val=%04x -> *p=%04x\n", addr, val,
	((val & 0xFF00) >> 8) \| ((val & 0x00FF) << 8));
	}
	#endif
	*p = ((val & 0xFF00) >> 8) \| ((val & 0x00FF) << 8);
	PSII_SYNC ();
	}

	/** Read one 2-byte word with byte swapping.
	* @param addr [IN] the address to read from
	* @return the value at addr
	*/
	unsigned short read2 (unsigned long addr)
	{
	unsigned short val;
	volatile unsigned short p = (volatile unsigned short ) addr;

	val = *p;
	val = ((val & 0xFF00) >> 8) \| ((val & 0x00FF) << 8);
	PSII_SYNC ();
	#ifdef VERBOSITY
	if (gVerbosityLevel > 1) {
	printf ("read2: addr=%08x p=%04x -> val=%04x\n", addr, p,
	val);
	}
	#endif
	return val;
	}

	/** Write one 4-byte word with byte swapping.
	* @param addr [IN] the address to write to
	* @param val [IN] the value to write
	*/
	void write4 (unsigned long addr, unsigned long val)
	{
	volatile unsigned long p = (volatile unsigned long ) addr;

	#ifdef VERBOSITY
	if (gVerbosityLevel > 1) {
	printf ("write4: addr=%08x val=%08x -> *p=%08x\n", addr, val,
	((val & 0xFF000000) >> 24) \|
	((val & 0x000000FF) << 24) \|
	((val & 0x00FF0000) >> 8) \|
	((val & 0x0000FF00) << 8));
	}
	#endif
	*p = ((val & 0xFF000000) >> 24) \| ((val & 0x000000FF) << 24) \|
	((val & 0x00FF0000) >> 8) \| ((val & 0x0000FF00) << 8);
	PSII_SYNC ();
	}

	/** Read one 4-byte word with byte swapping.
	* @param addr [IN] the address to read from
	* @return the value at addr
	*/
	unsigned long read4 (unsigned long addr)
	{
	unsigned long val;
	volatile unsigned long p = (volatile unsigned long ) addr;

	val = *p;
	val = ((val & 0xFF000000) >> 24) \| ((val & 0x000000FF) << 24) \|
	((val & 0x00FF0000) >> 8) \| ((val & 0x0000FF00) << 8);
	PSII_SYNC ();
	#ifdef VERBOSITY
	if (gVerbosityLevel > 1) {
	printf ("read4: addr=%08x p=%08x -> val=%08x\n", addr, p,
	val);
	}
	#endif
	return val;
	}

	int PCIReadConfig (int bus, int dev, int fn, int reg, int width,
	unsigned long *val)
	{
	unsigned int conAdrVal;
	unsigned int conDataReg = REG_CONFIG_DATA;
	unsigned int status;
	int ret_val = 0;


	/* DEST bit hardcoded to 1: local pci is PCI-2 */
	/* TYPE bit is hardcoded to 1: all config cycles are local */
	conAdrVal = (1 << 24)
	\| ((bus & 0xFF) << 16)
	\| ((dev & 0xFF) << 11)
	\| ((fn & 0x07) << 8)
	\| (reg & 0xFC);

	/* clear any pending master aborts */
	write4 (REG_P1_CSR, CLEAR_MASTER_ABORT);

	/* Load the conAdrVal value first, then read from pb_conf_data */
	write4 (REG_CONFIG_ADDRESS, conAdrVal);
	PSII_SYNC ();


	/* Note: documentation does not match the pspan library code */
	/* Note: pData comes back as -1 if device is not present /
	switch (width) {
	case 4:
	(unsigned int ) val = read4 (conDataReg);
	break;
	case 2:
	(unsigned short ) val = read2 (conDataReg);
	break;
	case 1:
	(unsigned char ) val = read1 (conDataReg);
	break;
	default:
	ret_val = ILLEGAL_REG_OFFSET;
	break;
	}
	PSII_SYNC ();

	/* clear any pending master aborts */
	status = read4 (REG_P1_CSR);
	if (status & CLEAR_MASTER_ABORT) {
	ret_val = NO_DEVICE_FOUND;
	write4 (REG_P1_CSR, CLEAR_MASTER_ABORT);
	}

	return ret_val;
	}


	int PCIWriteConfig (int bus, int dev, int fn, int reg, int width,
	unsigned long val)
	{
	unsigned int conAdrVal;
	unsigned int conDataReg = REG_CONFIG_DATA;
	unsigned int status;
	int ret_val = 0;


	/* DEST bit hardcoded to 1: local pci is PCI-2 */
	/* TYPE bit is hardcoded to 1: all config cycles are local */
	conAdrVal = (1 << 24)
	\| ((bus & 0xFF) << 16)
	\| ((dev & 0xFF) << 11)
	\| ((fn & 0x07) << 8)
	\| (reg & 0xFC);

	/* clear any pending master aborts */
	write4 (REG_P1_CSR, CLEAR_MASTER_ABORT);

	/* Load the conAdrVal value first, then read from pb_conf_data */
	write4 (REG_CONFIG_ADDRESS, conAdrVal);
	PSII_SYNC ();


	/* Note: documentation does not match the pspan library code */
	/* Note: pData comes back as -1 if device is not present /
	switch (width) {
	case 4:
	write4 (conDataReg, val);
	break;
	case 2:
	write2 (conDataReg, val);
	break;
	case 1:
	write1 (conDataReg, val);
	break;
	default:
	ret_val = ILLEGAL_REG_OFFSET;
	break;
	}
	PSII_SYNC ();

	/* clear any pending master aborts */
	status = read4 (REG_P1_CSR);
	if (status & CLEAR_MASTER_ABORT) {
	ret_val = NO_DEVICE_FOUND;
	write4 (REG_P1_CSR, CLEAR_MASTER_ABORT);
	}

	return ret_val;
	}


	int pci_read_config_byte (int bus, int dev, int fn, int reg,
	unsigned char *val)
	{
	unsigned long read_val;
	int ret_val;

	ret_val = PCIReadConfig (bus, dev, fn, reg, 1, &read_val);
	*val = read_val & 0xFF;

	return ret_val;
	}

	int pci_write_config_byte (int bus, int dev, int fn, int reg,
	unsigned char val)
	{
	return PCIWriteConfig (bus, dev, fn, reg, 1, val);
	}

	int pci_read_config_word (int bus, int dev, int fn, int reg,
	unsigned short *val)
	{
	unsigned long read_val;
	int ret_val;

	ret_val = PCIReadConfig (bus, dev, fn, reg, 2, &read_val);
	*val = read_val & 0xFFFF;

	return ret_val;
	}

	int pci_write_config_word (int bus, int dev, int fn, int reg,
	unsigned short val)
	{
	return PCIWriteConfig (bus, dev, fn, reg, 2, val);
	}

	int pci_read_config_dword (int bus, int dev, int fn, int reg,
	unsigned long *val)
	{
	return PCIReadConfig (bus, dev, fn, reg, 4, val);
	}

	int pci_write_config_dword (int bus, int dev, int fn, int reg,
	unsigned long val)
	{
	return PCIWriteConfig (bus, dev, fn, reg, 4, val);
	}

	#endif /* INCLUDE_PCI */

	int I2CAccess (unsigned char theI2CAddress, unsigned char theDevCode,
	unsigned char theChipSel, unsigned char *theValue, int RWFlag)
	{
	int ret_val = 0;
	unsigned int reg_value;

	reg_value = PowerSpanRead (REG_I2C_CSR);

	if (reg_value & I2C_CSR_ACT) {
	printf ("Error: I2C busy\n");
	ret_val = I2C_BUSY;
	} else {
	reg_value = ((theI2CAddress & 0xFF) << 24)
	\| ((theDevCode & 0x0F) << 12)
	\| ((theChipSel & 0x07) << 9)
	\| I2C_CSR_ERR;
	if (RWFlag == I2C_WRITE) {
	reg_value \|= I2C_CSR_RW \| ((*theValue & 0xFF) << 16);
	}

	PowerSpanWrite (REG_I2C_CSR, reg_value);
	udelay (1);

	do {
	reg_value = PowerSpanRead (REG_I2C_CSR);

	if ((reg_value & I2C_CSR_ACT) == 0) {
	if (reg_value & I2C_CSR_ERR) {
	ret_val = I2C_ERR;
	} else {
	*theValue =
	(reg_value & I2C_CSR_DATA) >>
	16;
	}
	}
	} while (reg_value & I2C_CSR_ACT);
	}

	return ret_val;
	}

	int EEPROMRead (unsigned char theI2CAddress, unsigned char *theValue)
	{
	return I2CAccess (theI2CAddress, I2C_EEPROM_DEV, I2C_EEPROM_CHIP_SEL,
	theValue, I2C_READ);
	}

	int EEPROMWrite (unsigned char theI2CAddress, unsigned char theValue)
	{
	return I2CAccess (theI2CAddress, I2C_EEPROM_DEV, I2C_EEPROM_CHIP_SEL,
	&theValue, I2C_WRITE);
	}

	int do_eeprom (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
	{
	char cmd;
	int ret_val = 0;
	unsigned int address = 0;
	unsigned char value = 1;
	unsigned char read_value;
	int ii;
	int error = 0;
	unsigned char *mem_ptr;
	unsigned char default_eeprom[] = EEPROM_DEFAULT;

	if (argc < 2) {
	goto usage;
	}

	cmd = argv[1][0];
	if (argc > 2) {
	address = simple_strtoul (argv[2], NULL, 16);
	if (argc > 3) {
	value = simple_strtoul (argv[3], NULL, 16) & 0xFF;
	}
	}

	switch (cmd) {
	case 'r':
	if (address > 256) {
	printf ("Illegal Address\n");
	goto usage;
	}
	printf ("@0x%x: ", address);
	for (ii = 0; ii < value; ii++) {
	if (EEPROMRead (address + ii, &read_value) !=
	0) {
	printf ("Read Error\n");
	} else {
	printf ("0x%02x ", read_value);
	}

	if (((ii + 1) % 16) == 0) {
	printf ("\n");
	}
	}
	printf ("\n");
	break;
	case 'w':
	if (address > 256) {
	printf ("Illegal Address\n");
	goto usage;
	}
	if (argc < 4) {
	goto usage;
	}
	if (EEPROMWrite (address, value) != 0) {
	printf ("Write Error\n");
	}
	break;
	case 'g':
	if (argc != 3) {
	goto usage;
	}
	mem_ptr = (unsigned char *) address;
	for (ii = 0; ((ii < EEPROM_LENGTH) && (error == 0));
	ii++) {
	if (EEPROMRead (ii, &read_value) != 0) {
	printf ("Read Error\n");
	error = 1;
	} else {
	*mem_ptr = read_value;
	mem_ptr++;
	}
	}
	break;
	case 'p':
	if (argc != 3) {
	goto usage;
	}
	mem_ptr = (unsigned char *) address;
	for (ii = 0; ((ii < EEPROM_LENGTH) && (error == 0));
	ii++) {
	if (EEPROMWrite (ii, *mem_ptr) != 0) {
	printf ("Write Error\n");
	error = 1;
	}

	mem_ptr++;
	}
	break;
	case 'd':
	if (argc != 2) {
	goto usage;
	}
	for (ii = 0; ((ii < EEPROM_LENGTH) && (error == 0));
	ii++) {
	if (EEPROMWrite (ii, default_eeprom[ii]) != 0) {
	printf ("Write Error\n");
	error = 1;
	}
	}
	break;
	default:
	goto usage;
	}

	goto done;
	usage:
	printf ("Usage:\n%s\n", cmdtp->help);

	done:
	return ret_val;

	}

	U_BOOT_CMD (eeprom, 4, 0, do_eeprom,
	"read/write/copy to/from the PowerSpan II eeprom",
	"eeprom r OFF [NUM]\n"
	" - read NUM words starting at OFF\n"
	"eeprom w OFF VAL\n"
	" - write word VAL at offset OFF\n"
	"eeprom g ADD\n"
	" - store contents of eeprom at address ADD\n"
	"eeprom p ADD\n"
	" - put data stored at address ADD into the eeprom\n"
	"eeprom d\n" " - return eeprom to default contents\n");

	unsigned int PowerSpanRead (unsigned int theOffset)
	{
	volatile unsigned int *ptr =
	(volatile unsigned int *) (PSPAN_BASEADDR + theOffset);
	unsigned int ret_val;

	#ifdef VERBOSITY
	if (gVerbosityLevel > 1) {
	printf ("PowerSpanRead: offset=%08x ", theOffset);
	}
	#endif
	ret_val = *ptr;
	PSII_SYNC ();

	#ifdef VERBOSITY
	if (gVerbosityLevel > 1) {
	printf ("value=%08x\n", ret_val);
	}
	#endif

	return ret_val;
	}

	void PowerSpanWrite (unsigned int theOffset, unsigned int theValue)
	{
	volatile unsigned int *ptr =
	(volatile unsigned int *) (PSPAN_BASEADDR + theOffset);
	#ifdef VERBOSITY
	if (gVerbosityLevel > 1) {
	printf ("PowerSpanWrite: offset=%08x val=%02x\n", theOffset,
	theValue);
	}
	#endif
	*ptr = theValue;
	PSII_SYNC ();
	}

	/**
	* Sets the indicated bits in the indicated register.
	* @param theOffset [IN] the register to access.
	* @param theMask [IN] bits set in theMask will be set in the register.
	*/
	void PowerSpanSetBits (unsigned int theOffset, unsigned int theMask)
	{
	volatile unsigned int *ptr =
	(volatile unsigned int *) (PSPAN_BASEADDR + theOffset);
	unsigned int register_value;

	#ifdef VERBOSITY
	if (gVerbosityLevel > 1) {
	printf ("PowerSpanSetBits: offset=%08x mask=%02x\n",
	theOffset, theMask);
	}
	#endif
	register_value = *ptr;
	PSII_SYNC ();

	register_value \|= theMask;
	*ptr = register_value;
	PSII_SYNC ();
	}

	/**
	* Clears the indicated bits in the indicated register.
	* @param theOffset [IN] the register to access.
	* @param theMask [IN] bits set in theMask will be cleared in the register.
	*/
	void PowerSpanClearBits (unsigned int theOffset, unsigned int theMask)
	{
	volatile unsigned int *ptr =
	(volatile unsigned int *) (PSPAN_BASEADDR + theOffset);
	unsigned int register_value;

	#ifdef VERBOSITY
	if (gVerbosityLevel > 1) {
	printf ("PowerSpanClearBits: offset=%08x mask=%02x\n",
	theOffset, theMask);
	}
	#endif
	register_value = *ptr;
	PSII_SYNC ();

	register_value &= ~theMask;
	*ptr = register_value;
	PSII_SYNC ();
	}

	/**
	* Configures a slave image on the local bus, based on the parameters and some hardcoded system values.
	* Slave Images are images that cause the PowerSpan II to be a master on the PCI bus. Thus, they
	* are outgoing from the standpoint of the local bus.
	* @param theImageIndex [IN] the PowerSpan II image to set (assumed to be 0-7).
	* @param theBlockSize [IN] the block size of the image (as used by PowerSpan II: PB_SIx_CTL[BS]).
	* @param theMemIOFlag [IN] if PX_TGT_USE_MEM_IO, this image will have the MEM_IO bit set.
	* @param theEndianness [IN] the endian bits for the image (already shifted, use defines).
	* @param theLocalBaseAddr [IN] the Local address for the image (assumed to be valid with provided block size).
	* @param thePCIBaseAddr [IN] the PCI address for the image (assumed to be valid with provided block size).
	*/
	int SetSlaveImage (int theImageIndex, unsigned int theBlockSize,
	int theMemIOFlag, int theEndianness,
	unsigned int theLocalBaseAddr, unsigned int thePCIBaseAddr)
	{
	unsigned int reg_offset = theImageIndex * PB_SLAVE_IMAGE_OFF;
	unsigned int reg_value = 0;

	/* Make sure that the Slave Image is disabled */
	PowerSpanClearBits ((REGS_PB_SLAVE_CSR + reg_offset),
	PB_SLAVE_CSR_IMG_EN);

	/* Setup the mask required for requested PB Slave Image configuration */
	reg_value = PB_SLAVE_CSR_TA_EN \| theEndianness \| (theBlockSize << 24);
	if (theMemIOFlag == PB_SLAVE_USE_MEM_IO) {
	reg_value \|= PB_SLAVE_CSR_MEM_IO;
	}

	/* hardcoding the following:
	TA_EN = 1
	MD_EN = 0
	MODE = 0
	PRKEEP = 0
	RD_AMT = 0
	*/
	PowerSpanWrite ((REGS_PB_SLAVE_CSR + reg_offset), reg_value);

	/* these values are not checked by software */
	PowerSpanWrite ((REGS_PB_SLAVE_BADDR + reg_offset), theLocalBaseAddr);
	PowerSpanWrite ((REGS_PB_SLAVE_TADDR + reg_offset), thePCIBaseAddr);

	/* Enable the Slave Image */
	PowerSpanSetBits ((REGS_PB_SLAVE_CSR + reg_offset),
	PB_SLAVE_CSR_IMG_EN);

	return 0;
	}

	/**
	* Configures a target image on the local bus, based on the parameters and some hardcoded system values.
	* Target Images are used when the PowerSpan II is acting as a target for an access. Thus, they
	* are incoming from the standpoint of the local bus.
	* In order to behave better on the host PCI bus, if thePCIBaseAddr is NULL (0x00000000), then the PCI
	* base address will not be updated; makes sense given that the hosts own memory should be mapped to
	* PCI address 0x00000000.
	* @param theImageIndex [IN] the PowerSpan II image to set.
	* @param theBlockSize [IN] the block size of the image (as used by PowerSpan II: Px_TIx_CTL[BS]).
	* @param theMemIOFlag [IN] if PX_TGT_USE_MEM_IO, this image will have the MEM_IO bit set.
	* @param theEndianness [IN] the endian bits for the image (already shifted, use defines).
	* @param theLocalBaseAddr [IN] the Local address for the image (assumed to be valid with provided block size).
	* @param thePCIBaseAddr [IN] the PCI address for the image (assumed to be valid with provided block size).
	*/
	int SetTargetImage (int theImageIndex, unsigned int theBlockSize,
	int theMemIOFlag, int theEndianness,
	unsigned int theLocalBaseAddr,
	unsigned int thePCIBaseAddr)
	{
	unsigned int csr_reg_offset = theImageIndex * P1_TGT_IMAGE_OFF;
	unsigned int pci_reg_offset = theImageIndex * P1_BST_OFF;
	unsigned int reg_value = 0;

	/* Make sure that the Slave Image is disabled */
	PowerSpanClearBits ((REGS_P1_TGT_CSR + csr_reg_offset),
	PB_SLAVE_CSR_IMG_EN);

	/* Setup the mask required for requested PB Slave Image configuration */
	reg_value =
	PX_TGT_CSR_TA_EN \| PX_TGT_CSR_BAR_EN \| (theBlockSize << 24) \|
	PX_TGT_CSR_RTT_READ \| PX_TGT_CSR_WTT_WFLUSH \| theEndianness;
	if (theMemIOFlag == PX_TGT_USE_MEM_IO) {
	reg_value \|= PX_TGT_MEM_IO;
	}

	/* hardcoding the following:
	TA_EN = 1
	BAR_EN = 1
	MD_EN = 0
	MODE = 0
	DEST = 0
	RTT = 01010
	GBL = 0
	CI = 0
	WTT = 00010
	PRKEEP = 0
	MRA = 0
	RD_AMT = 0
	*/
	PowerSpanWrite ((REGS_P1_TGT_CSR + csr_reg_offset), reg_value);

	PowerSpanWrite ((REGS_P1_TGT_TADDR + csr_reg_offset),
	theLocalBaseAddr);

	if (thePCIBaseAddr != (unsigned int) NULL) {
	PowerSpanWrite ((REGS_P1_BST + pci_reg_offset),
	thePCIBaseAddr);
	}

	/* Enable the Slave Image */
	PowerSpanSetBits ((REGS_P1_TGT_CSR + csr_reg_offset),
	PB_SLAVE_CSR_IMG_EN);

	return 0;
	}

	int do_bridge (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
	{
	char cmd;
	int ret_val = 1;
	unsigned int image_index;
	unsigned int block_size;
	unsigned int mem_io;
	unsigned int local_addr;
	unsigned int pci_addr;
	int endianness;

	if (argc != 8) {
	goto usage;
	}

	cmd = argv[1][0];
	image_index = simple_strtoul (argv[2], NULL, 16);
	block_size = simple_strtoul (argv[3], NULL, 16);
	mem_io = simple_strtoul (argv[4], NULL, 16);
	endianness = argv[5][0];
	local_addr = simple_strtoul (argv[6], NULL, 16);
	pci_addr = simple_strtoul (argv[7], NULL, 16);


	switch (cmd) {
	case 'i':
	if (tolower (endianness) == 'b') {
	endianness = PX_TGT_CSR_BIG_END;
	} else if (tolower (endianness) == 'l') {
	endianness = PX_TGT_CSR_TRUE_LEND;
	} else {
	goto usage;
	}
	SetTargetImage (image_index, block_size, mem_io,
	endianness, local_addr, pci_addr);
	break;
	case 'o':
	if (tolower (endianness) == 'b') {
	endianness = PB_SLAVE_CSR_BIG_END;
	} else if (tolower (endianness) == 'l') {
	endianness = PB_SLAVE_CSR_TRUE_LEND;
	} else {
	goto usage;
	}
	SetSlaveImage (image_index, block_size, mem_io,
	endianness, local_addr, pci_addr);
	break;
	default:
	goto usage;
	}

	goto done;
	usage:
	printf ("Usage:\n%s\n", cmdtp->help);

	done:
	return ret_val;
	}