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hermon_spi.c
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hermon_spi.c
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/*
* Copyright (C) 2007 American Megatrends Inc
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "spiflash.h"
#include "../../../../projdef.h"
#ifdef __UBOOT__
#include "soc_hw.h"
#endif
#define SPI_INPUT_CLOCK 100 /* Input Frequency MHZ */
#define MAX_CLOCK 25 /* Max SPI Frequency MHZ supported by Controller */
#define MAX_READ 4
#define MAX_CHIPS 4
#define EXTENDED_WRITE 1
typedef struct
{
volatile unsigned char FIU_CFG;
volatile unsigned char BURST_CFG;
volatile unsigned char RESP_CFG;
volatile unsigned char CFBB_PROT;
volatile unsigned short FWIN1_LOW;
volatile unsigned short FWIN1_HIGH;
volatile unsigned short FWIN2_LOW;
volatile unsigned short FWIN2_HIGH;
volatile unsigned short FWIN3_LOW;
volatile unsigned short FWIN3_HIGH;
volatile unsigned char PROT_LOCK;
volatile unsigned char PROT_CLEAR;
volatile unsigned char Rsvd[2];
volatile unsigned char SPI_FL_CFG;
volatile unsigned char Rsvd1;
volatile unsigned char UMA_CODE;
volatile unsigned char UMA_AB0; /* lsb address */
volatile unsigned char UMA_AB1;
volatile unsigned char UMA_AB2;
volatile unsigned char UMA_DB0; // cannot make union - not on word address
volatile unsigned char UMA_DB1;
volatile unsigned char UMA_DB2;
volatile unsigned char UMA_DB3;
volatile unsigned char UMA_CTS;
volatile unsigned char UMA_ECTS;
} BOOT_SPI_REGS;
#ifdef __UBOOT__
volatile BOOT_SPI_REGS *Regs = (volatile BOOT_SPI_REGS *)(WPCM_BOOT_SPI_BASE);
#else
volatile BOOT_SPI_REGS *Regs = NULL; /* will be io-remapped during init */
#endif
static
int
hermon_read_xfer(int cs, unsigned char *cmd,int cmdlen, SPI_DIR dir,
unsigned char *data, unsigned long datalen) ;
#if (EXTENDED_WRITE == 1)
static
int
hermon_write_extended_xfer(int cs, unsigned char *cmd,int cmdlen, SPI_DIR dir,
unsigned char *data, unsigned long datalen) ;
#endif
static
int
hermon_write_single_xfer(int cs, unsigned char *cmd,int cmdlen, SPI_DIR dir,
unsigned char *data, unsigned long datalen) ;
static
void
InitializeCtrl(void)
{
*(volatile unsigned long *)(GCR_MFSEL1) &= 0xFFFFFFDF ; // make gpio into SPI Chip Select 3
*(volatile unsigned long *)(GCR_MFSEL1) |= 0x010 ; // make gpio into SPI Chip Select 2
*(volatile unsigned long *)(GCR_MFSEL1) |= 0x08 ; // make gpio into SPI Chip Select 1
// set total flash size in number of 512K byte blocks
Regs->FIU_CFG = (CFG_PROJ_FLASH_SIZE) / 524288 ;
Regs->SPI_FL_CFG = (CFG_PROJ_FLASH_BANK_SIZE) / 524288 ;
/* Set access limit registers */
/* Open up entire 64MB space */
Regs->FWIN1_LOW = 0 ;
Regs->FWIN1_HIGH = 0x4000 ;
Regs->FWIN2_LOW = 0 ;
Regs->FWIN2_HIGH = 0 ;
Regs->FWIN3_LOW = 0 ;
Regs->FWIN3_HIGH = 0 ;
return;
}
static
int
ValidateInputs(unsigned char *cmd,int cmdlen, SPI_DIR dir,
unsigned char *data, int datalen)
{
if ((cmdlen != 1) && (cmdlen != 4) && (cmdlen !=5))
{
printk("hermon_spi : Invalid Command Len %d\n",cmdlen);
return -1;
}
if (cmd == NULL)
{
printk("hermon_spi : Invalid : Null Command\n");
return -1;
}
if (dir != SPI_NONE)
{
if ( (data == NULL) || (datalen == 0))
{
printk("hermon_spi : Invalid data or datalen \n");
return -1;
}
}
if ((dir == SPI_READ) && (datalen > MAX_READ))
{
printk("hermon_spi : Invalid : Reads cannot exceed %d bytes\n",MAX_READ);
return -1;
}
return 0;
}
static
int
hermon_read_xfer(int cs, unsigned char *cmd,int cmdlen, SPI_DIR dir,
unsigned char *data, unsigned long datalen)
{
unsigned char uma_opcode ;
unsigned long src ;
unsigned long transfer;
/* The command has to execute at least once for command that don't need data */
while(1)
{
/* Fill opcode and address */
Regs->UMA_CODE = cmd[0];
Regs->UMA_AB0 = cmd[3];
Regs->UMA_AB1 = cmd[2];
Regs->UMA_AB2 = cmd[1];
src = cmd[1] << 16 | cmd[2] << 8 | cmd[3];
/* Based on len, select Data Field size */
switch(datalen)
{
case 0:
uma_opcode = 0x0 ;
break ;
case 1:
uma_opcode = 0x1 ;
break ;
case 2:
uma_opcode = 0x2 ;
break ;
case 3:
uma_opcode = 0x3 ;
break ;
case 4:
uma_opcode = 0x4;
break;
default:
printk("hermon_read_xfer: ERROR Cannot Handle datalen > 4\n");
return -1;
}
transfer = uma_opcode;
/* Set if Address Field to be used or not */
if (cmdlen != 1)
uma_opcode |= 0x08;
/* Select which bank */
uma_opcode |= ((cs & 3) << 5);
/* Issue Command Trigger */
Regs->UMA_CTS = (uma_opcode | 0x80);
/* wait for transaction to complete */
while(Regs->UMA_CTS & 0x80) ;
/* Read data received */
switch(transfer)
{
case 1:
*data = Regs->UMA_DB0 ;
data++ ;
break ;
case 2:
*data = Regs->UMA_DB0 ;
data++ ;
*data = Regs->UMA_DB1 ;
data++ ;
break ;
case 3:
*data = Regs->UMA_DB0 ;
data++ ;
*data = Regs->UMA_DB1 ;
data++ ;
*data = Regs->UMA_DB2 ;
data++ ;
break ;
case 4:
*data = Regs->UMA_DB0 ;
data++ ;
*data = Regs->UMA_DB1 ;
data++ ;
*data = Regs->UMA_DB2 ;
data++ ;
*data = Regs->UMA_DB3 ;
data++ ;
break ;
}
datalen -= transfer ;
if (datalen == 0)
break;
/* Increment Source address */
src = cmd[1] << 16 | cmd[2] << 8 | cmd[3];
src += transfer ;
cmd[1] = src >> 16;
cmd[2] = src >> 8;
cmd[3] = src;
}
return 0 ;
}
#if (EXTENDED_WRITE == 1)
static
int
hermon_write_extended_xfer(int cs,unsigned char *cmd,int cmdlen, SPI_DIR dir,
unsigned char *data, unsigned long datalen)
{
unsigned char uma_code ;
/* If data len < 8 do normal byte writes */
if (datalen < 8)
return hermon_write_single_xfer(cs,cmd,cmdlen,dir,data,datalen);
/* ------------------------Do extended transfers --------------------*/
switch(cs & 3)
{
case 0:
Regs->UMA_ECTS = 0xE ; // software assert cs0
break;
case 1:
Regs->UMA_ECTS = 0xD ; // software assert cs1
break;
case 2:
Regs->UMA_ECTS = 0xB ; // software assert cs2
break;
case 3:
Regs->UMA_ECTS = 0x7 ; // software assert cs3
break;
}
/* first is normal write uma transaction with no data xfer */
Regs->UMA_CODE = cmd[0];
Regs->UMA_AB0 = cmd[3];
Regs->UMA_AB1 = cmd[2];
Regs->UMA_AB2 = cmd[1];
if (cmdlen == 1)
uma_code = 0x90 | ((cs &3) << 5);
else
uma_code = 0x98 | ((cs &3) << 5);
Regs->UMA_CTS = uma_code;
/* wait for transaction to complete */
while(Regs->UMA_CTS & 0x80) ;
/* Xfer 8 bytes at a time */
/* The spi controller thinks it is issuing a normal cmd, address, and data
sequence, but since Chip Select is stuck low, they are just data bytes */
while(datalen >= 8)
{
Regs->UMA_CODE = *data ;
Regs->UMA_AB2 = *(data + 1) ;
Regs->UMA_AB1 = *(data + 2) ;
Regs->UMA_AB0 = *(data + 3) ;
Regs->UMA_DB0 = *(data + 4) ;
Regs->UMA_DB1 = *(data + 5) ;
Regs->UMA_DB2 = *(data + 6) ;
Regs->UMA_DB3 = *(data + 7) ;
Regs->UMA_CTS = 0x9C | (cs & 3) << 5; // spi cmd, 3 address bytes and 4 data bytes
/* wait for transaction to complete */
while(Regs->UMA_CTS & 0x80);
data+=8 ;
datalen-=8 ;
}
/* Deassert CS to stop extended transfers */
Regs->UMA_ECTS = 0xF ;
return datalen;
}
#endif
static
int
hermon_write_single_xfer(int cs,unsigned char *cmd,int cmdlen, SPI_DIR dir,
unsigned char *data, unsigned long datalen)
{
unsigned char uma_opcode ;
unsigned long transfer;
transfer = (datalen > 4)?4:datalen;
Regs->UMA_CODE = cmd[0];
Regs->UMA_AB0 = cmd[3];
Regs->UMA_AB1 = cmd[2];
Regs->UMA_AB2 = cmd[1];
if (cmdlen == 1)
uma_opcode = 0x90 | ((cs &3) << 5);
else
uma_opcode = 0x98 | ((cs &3) << 5);
uma_opcode |= (transfer & 0x7);
switch (transfer)
{
case 4:
Regs->UMA_DB3 = *(data+3);
case 3:
Regs->UMA_DB2 = *(data+2);
case 2:
Regs->UMA_DB1 = *(data+1);
case 1:
Regs->UMA_DB0 = *(data+0);
}
Regs->UMA_CTS = uma_opcode ;
while(Regs->UMA_CTS & 0x80) ; // wait for transaction to complete
return datalen-transfer;
}
static
int
hermon_spi_burst_read(int cs, unsigned char *cmd,int cmdlen, SPI_DIR dir,
unsigned char *data, unsigned long datalen)
{
unsigned long transfer;
unsigned long src;
if (cs >= MAX_CHIPS)
return -1;
src = cmd[1] << 16 | cmd[2] << 8 | cmd[3];
while (datalen)
{
cmd[1] = src >> 16;
cmd[2] = src >> 8;
cmd[3] = src;
transfer = (datalen > MAX_READ)?MAX_READ:datalen;
if (hermon_read_xfer(cs,cmd, cmdlen, dir,data,transfer) == -1)
return -1;
datalen-=transfer;
data+=transfer;
src+=transfer;
}
return 0;
}
static
int
hermon_spi_transfer(int cs,unsigned char *cmd,int cmdlen, SPI_DIR dir,
unsigned char *data, unsigned long datalen)
{
if (cs >= MAX_CHIPS)
return -1;
if (ValidateInputs(cmd,cmdlen,dir,data,datalen) == -1)
return -1;
if (dir == SPI_READ) {
return hermon_read_xfer(cs,cmd, cmdlen, dir,
data, datalen) ;
}
if (dir == SPI_WRITE) {
#if (EXTENDED_WRITE == 1)
return hermon_write_extended_xfer(cs, cmd,cmdlen, dir,
data, datalen) ;
#else
return hermon_write_single_xfer(cs, cmd,cmdlen, dir,
data, datalen) ;
#endif
}
if (dir == SPI_NONE) {
return hermon_read_xfer(cs,cmd, cmdlen, dir,NULL,0);
}
printk("hermon_spi_transfer: ERROR: Unknown direction\n");
return -1;
}
#ifdef __UBOOT__
extern void ll_serial_init(void);
static int
hermon_spi_init(void)
{
//ll_serial_init();
InitializeCtrl();
return 0;
}
#endif
#ifndef __UBOOT__ /* linux */
struct spi_ctrl_driver hermon_spi_driver =
#else
/*
Uboot supports only one spi controller and has to be defined
in the structure "SPI_CTRL_DRIVER"
*/
struct spi_ctrl_driver SPI_CTRL_DRIVER =
#endif
{
.name = "hermon_spi",
.module = THIS_MODULE,
.max_read = MAX_READ,
.fast_read = 0,
.spi_transfer = hermon_spi_transfer,
.spi_burst_read = hermon_spi_burst_read,
#ifdef __UBOOT__
.spi_init = hermon_spi_init,
#endif
};
#ifndef __UBOOT__ /* linux */
static int
hermon_spi_init(void)
{
Regs = ioremap_nocache(WPCM_BOOT_SPI_BASE,SZ_4K);
if (Regs == NULL)
{
printk("ERROR: Unable to ioremap WPCM450 SPI Flash Registers\n");
return -1;
}
InitializeCtrl();
init_MUTEX(&hermon_spi_driver.lock);
register_spi_ctrl_driver(&hermon_spi_driver);
return 0;
}
static void
hermon_spi_exit(void)
{
unregister_spi_ctrl_driver(&hermon_spi_driver);
iounmap((void*)Regs);
return;
}
module_init(hermon_spi_init);
module_exit(hermon_spi_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("American Megatrends Inc");
MODULE_DESCRIPTION("WPCM450 SOC SPI Controller driver");
#endif