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u-boot/arch/powerpc/cpu/mpc5xx/spi.c
Stefan Roese a47a12becf Move arch/ppc to arch/powerpc 
As discussed on the list, move "arch/ppc" to "arch/powerpc" to
better match the Linux directory structure.

Please note that this patch also changes the "ppc" target in
MAKEALL to "powerpc" to match this new infrastructure. But "ppc"
is kept as an alias for now, to not break compatibility with
scripts using this name.

Signed-off-by: Stefan Roese <sr@denx.de>
Acked-by: Wolfgang Denk <wd@denx.de>
Acked-by: Detlev Zundel <dzu@denx.de>
Acked-by: Kim Phillips <kim.phillips@freescale.com>
Cc: Peter Tyser <ptyser@xes-inc.com>
Cc: Anatolij Gustschin <agust@denx.de>
2010-04-21 23:42:38 +02:00

412 lines
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/*
* Copyright (c) 2001 Navin Boppuri / Prashant Patel
* <nboppuri@trinetcommunication.com>,
* <pmpatel@trinetcommunication.com>
* Copyright (c) 2001 Gerd Mennchen <Gerd.Mennchen@icn.siemens.de>
* Copyright (c) 2001 Wolfgang Denk, DENX Software Engineering, <wd@denx.de>.
*
* 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
*/
/*
* MPC5xx CPM SPI interface.
*
* Parts of this code are probably not portable and/or specific to
* the board which I used for the tests. Please send fixes/complaints
* to wd@denx.de
*
* Ported to MPC5xx
* Copyright (c) 2003 Denis Peter, MPL AG Switzerland, d.petr@mpl.ch.
*/
#include <common.h>
#include <mpc5xx.h>
#include <asm/5xx_immap.h>
#include <linux/ctype.h>
#include <malloc.h>
#include <post.h>
#include <net.h>
#if defined(CONFIG_SPI)
#undef DEBUG
#define SPI_EEPROM_WREN 0x06
#define SPI_EEPROM_RDSR 0x05
#define SPI_EEPROM_READ 0x03
#define SPI_EEPROM_WRITE 0x02
#ifdef DEBUG
#define DPRINT(a) printf a;
/* -----------------------------------------------
* Helper functions to peek into tx and rx buffers
* ----------------------------------------------- */
static const char * const hex_digit = "0123456789ABCDEF";
static char quickhex (int i)
{
return hex_digit[i];
}
static void memdump (void *pv, int num)
{
int i;
unsigned char *pc = (unsigned char *) pv;
for (i = 0; i < num; i++)
printf ("%c%c ", quickhex (pc[i] >> 4), quickhex (pc[i] & 0x0f));
printf ("\t");
for (i = 0; i < num; i++)
printf ("%c", isprint (pc[i]) ? pc[i] : '.');
printf ("\n");
}
#else /* !DEBUG */
#define DPRINT(a)
#endif /* DEBUG */
/* -------------------
* Function prototypes
* ------------------- */
void spi_init (void);
ssize_t spi_read (uchar *, int, uchar *, int);
ssize_t spi_write (uchar *, int, uchar *, int);
ssize_t spi_xfer (size_t);
/* **************************************************************************
*
* Function: spi_init_f
*
* Description: Init SPI-Controller (ROM part)
*
* return: ---
*
* *********************************************************************** */
void spi_init_f (void)
{
int i;
volatile immap_t *immr;
volatile qsmcm5xx_t *qsmcm;
immr = (immap_t *) CONFIG_SYS_IMMR;
qsmcm = (qsmcm5xx_t *)&immr->im_qsmcm;
qsmcm->qsmcm_qsmcr = 0; /* all accesses enabled */
qsmcm->qsmcm_qspi_il = 0; /* lowest IRQ */
/* --------------------------------------------
* GPIO or per. Function
* PQSPAR[00] = 0 reserved
* PQSPAR[01] = 1 [0x4000] -> PERI: (SPICS3)
* PQSPAR[02] = 0 [0x0000] -> GPIO
* PQSPAR[03] = 0 [0x0000] -> GPIO
* PQSPAR[04] = 1 [0x0800] -> PERI: (SPICS0)
* PQSPAR[05] = 0 reseved
* PQSPAR[06] = 1 [0x0200] -> PERI: (SPIMOSI)
* PQSPAR[07] = 1 [0x0100] -> PERI: (SPIMISO)
* -------------------------------------------- */
qsmcm->qsmcm_pqspar = 0x3 | (CONFIG_SYS_SPI_CS_USED << 3);
/* --------------------------------------------
* DDRQS[00] = 0 reserved
* DDRQS[01] = 1 [0x0040] -> SPICS3 Output
* DDRQS[02] = 0 [0x0000] -> GPIO Output
* DDRQS[03] = 0 [0x0000] -> GPIO Output
* DDRQS[04] = 1 [0x0008] -> SPICS0 Output
* DDRQS[05] = 1 [0x0004] -> SPICLK Output
* DDRQS[06] = 1 [0x0002] -> SPIMOSI Output
* DDRQS[07] = 0 [0x0001] -> SPIMISO Input
* -------------------------------------------- */
qsmcm->qsmcm_ddrqs = 0x7E;
/* --------------------------------------------
* Base state for used SPI CS pins, if base = 0 active must be 1
* PORTQS[00] = 0 reserved
* PORTQS[01] = 0 reserved
* PORTQS[02] = 0 reserved
* PORTQS[03] = 0 reserved
* PORTQS[04] = 0 [0x0000] RxD2
* PORTQS[05] = 1 [0x0400] TxD2
* PORTQS[06] = 0 [0x0000] RxD1
* PORTQS[07] = 1 [0x0100] TxD1
* PORTQS[08] = 0 reserved
* PORTQS[09] = 0 [0x0000] -> SPICS3 Base Output
* PORTQS[10] = 0 [0x0000] -> SPICS2 Base Output
* PORTQS[11] = 0 [0x0000] -> SPICS1 Base Output
* PORTQS[12] = 0 [0x0000] -> SPICS0 Base Output
* PORTQS[13] = 0 [0x0004] -> SPICLK Output
* PORTQS[14] = 0 [0x0002] -> SPIMOSI Output
* PORTQS[15] = 0 [0x0001] -> SPIMISO Input
* -------------------------------------------- */
qsmcm->qsmcm_portqs |= (CONFIG_SYS_SPI_CS_BASE << 3);
/* --------------------------------------------
* Controll Register 0
* SPCR0[00] = 1 (0x8000) Master
* SPCR0[01] = 0 (0x0000) Wired-Or
* SPCR0[2..5] = (0x2000) Bits per transfer (default 8)
* SPCR0[06] = 0 (0x0000) Normal polarity
* SPCR0[07] = 0 (0x0000) Normal Clock Phase
* SPCR0[08..15] = 14 1.4MHz
*/
qsmcm->qsmcm_spcr0=0xA00E;
/* --------------------------------------------
* Controll Register 1
* SPCR1[00] = 0 (0x0000) QSPI enabled
* SPCR1[1..7] = (0x7F00) Delay before Transfer
* SPCR1[8..15] = (0x0000) Delay After transfer (204.8usec@40MHz)
*/
qsmcm->qsmcm_spcr1=0x7F00;
/* --------------------------------------------
* Controll Register 2
* SPCR2[00] = 0 (0x0000) SPI IRQs Disabeld
* SPCR2[01] = 0 (0x0000) No Wrap around
* SPCR2[02] = 0 (0x0000) Wrap to 0
* SPCR2[3..7] = (0x0000) End Queue pointer = 0
* SPCR2[8..10] = 0 (0x0000) reserved
* SPCR2[11..15] = 0 (0x0000) NewQueue Address = 0
*/
qsmcm->qsmcm_spcr2=0x0000;
/* --------------------------------------------
* Controll Register 3
* SPCR3[00..04] = 0 (0x0000) reserved
* SPCR3[05] = 0 (0x0000) Feedback disabled
* SPCR3[06] = 0 (0x0000) IRQ on HALTA & MODF disabled
* SPCR3[07] = 0 (0x0000) Not halted
*/
qsmcm->qsmcm_spcr3=0x00;
/* --------------------------------------------
* SPSR (Controll Register 3) Read only/ reset Flags 08,09,10
* SPCR3[08] = 1 (0x80) QSPI finished
* SPCR3[09] = 1 (0x40) Mode Fault Flag
* SPCR3[10] = 1 (0x20) HALTA
* SPCR3[11..15] = 0 (0x0000) Last executed command
*/
qsmcm->qsmcm_spsr=0xE0;
/*-------------------------------------------
* Setup RAM
*/
for(i=0;i<32;i++) {
qsmcm->qsmcm_recram[i]=0x0000;
qsmcm->qsmcm_tranram[i]=0x0000;
qsmcm->qsmcm_comdram[i]=0x00;
}
return;
}
/* **************************************************************************
*
* Function: spi_init_r
* Dummy, all initializations have been done in spi_init_r
* *********************************************************************** */
void spi_init_r (void)
{
return;
}
/****************************************************************************
* Function: spi_write
**************************************************************************** */
ssize_t short_spi_write (uchar *addr, int alen, uchar *buffer, int len)
{
int i,dlen;
volatile immap_t *immr;
volatile qsmcm5xx_t *qsmcm;
immr = (immap_t *) CONFIG_SYS_IMMR;
qsmcm = (qsmcm5xx_t *)&immr->im_qsmcm;
for(i=0;i<32;i++) {
qsmcm->qsmcm_recram[i]=0x0000;
qsmcm->qsmcm_tranram[i]=0x0000;
qsmcm->qsmcm_comdram[i]=0x00;
}
qsmcm->qsmcm_tranram[0] = SPI_EEPROM_WREN; /* write enable */
spi_xfer(1);
i=0;
qsmcm->qsmcm_tranram[i++] = SPI_EEPROM_WRITE; /* WRITE memory array */
qsmcm->qsmcm_tranram[i++] = addr[0];
qsmcm->qsmcm_tranram[i++] = addr[1];
for(dlen=0;dlen<len;dlen++) {
qsmcm->qsmcm_tranram[i+dlen] = buffer[dlen]; /* WRITE memory array */
}
/* transmit it */
spi_xfer(i+dlen);
/* ignore received data */
for (i = 0; i < 1000; i++) {
qsmcm->qsmcm_tranram[0] = SPI_EEPROM_RDSR; /* read status */
qsmcm->qsmcm_tranram[1] = 0;
spi_xfer(2);
if (!(qsmcm->qsmcm_recram[1] & 1)) {
break;
}
udelay(1000);
}
if (i >= 1000) {
printf ("*** spi_write: Time out while writing!\n");
}
return len;
}
#define TRANSFER_LEN 16
ssize_t spi_write (uchar *addr, int alen, uchar *buffer, int len)
{
int index,i,newlen;
uchar newaddr[2];
int curraddr;
curraddr=(addr[alen-2]<<8)+addr[alen-1];
i=len;
index=0;
do {
newaddr[1]=(curraddr & 0xff);
newaddr[0]=((curraddr>>8) & 0xff);
if(i>TRANSFER_LEN) {
newlen=TRANSFER_LEN;
i-=TRANSFER_LEN;
}
else {
newlen=i;
i=0;
}
short_spi_write (newaddr, 2, &buffer[index], newlen);
index+=newlen;
curraddr+=newlen;
}while(i);
return (len);
}
/****************************************************************************
* Function: spi_read
**************************************************************************** */
ssize_t short_spi_read (uchar *addr, int alen, uchar *buffer, int len)
{
int i;
volatile immap_t *immr;
volatile qsmcm5xx_t *qsmcm;
immr = (immap_t *) CONFIG_SYS_IMMR;
qsmcm = (qsmcm5xx_t *)&immr->im_qsmcm;
for(i=0;i<32;i++) {
qsmcm->qsmcm_recram[i]=0x0000;
qsmcm->qsmcm_tranram[i]=0x0000;
qsmcm->qsmcm_comdram[i]=0x00;
}
i=0;
qsmcm->qsmcm_tranram[i++] = (SPI_EEPROM_READ); /* READ memory array */
qsmcm->qsmcm_tranram[i++] = addr[0] & 0xff;
qsmcm->qsmcm_tranram[i++] = addr[1] & 0xff;
spi_xfer(3 + len);
for(i=0;i<len;i++) {
*buffer++=(char)qsmcm->qsmcm_recram[i+3];
}
return len;
}
ssize_t spi_read (uchar *addr, int alen, uchar *buffer, int len)
{
int index,i,newlen;
uchar newaddr[2];
int curraddr;
curraddr=(addr[alen-2]<<8)+addr[alen-1];
i=len;
index=0;
do {
newaddr[1]=(curraddr & 0xff);
newaddr[0]=((curraddr>>8) & 0xff);
if(i>TRANSFER_LEN) {
newlen=TRANSFER_LEN;
i-=TRANSFER_LEN;
}
else {
newlen=i;
i=0;
}
short_spi_read (newaddr, 2, &buffer[index], newlen);
index+=newlen;
curraddr+=newlen;
}while(i);
return (len);
}
/****************************************************************************
* Function: spi_xfer
**************************************************************************** */
ssize_t spi_xfer (size_t count)
{
volatile immap_t *immr;
volatile qsmcm5xx_t *qsmcm;
int i;
int tm;
ushort status;
immr = (immap_t *) CONFIG_SYS_IMMR;
qsmcm = (qsmcm5xx_t *)&immr->im_qsmcm;
DPRINT (("*** spi_xfer entered count %d***\n",count));
/* Set CS for device */
for(i=0;i<(count-1);i++)
qsmcm->qsmcm_comdram[i] = 0x80 | CONFIG_SYS_SPI_CS_ACT; /* CS3 is connected to the SPI EEPROM */
qsmcm->qsmcm_comdram[i] = CONFIG_SYS_SPI_CS_ACT; /* CS3 is connected to the SPI EEPROM */
qsmcm->qsmcm_spcr2=((count-1)&0x1F)<<8;
DPRINT (("*** spi_xfer: Bytes to be xferred: %d ***\n", count));
qsmcm->qsmcm_spsr=0xE0; /* clear all flags */
/* start spi transfer */
DPRINT (("*** spi_xfer: Performing transfer ...\n"));
qsmcm->qsmcm_spcr1 |= 0x8000; /* Start transmit */
/* --------------------------------
* Wait for SPI transmit to get out
* or time out (1 second = 1000 ms)
* -------------------------------- */
for (tm=0; tm<1000; ++tm) {
status=qsmcm->qsmcm_spcr1;
if((status & 0x8000)==0)
break;
udelay (1000);
}
if (tm >= 1000) {
printf ("*** spi_xfer: Time out while xferring to/from SPI!\n");
}
#ifdef DEBUG
printf ("\nspi_xfer: txbuf after xfer\n");
memdump ((void *) qsmcm->qsmcm_tranram, 32); /* dump of txbuf before transmit */
printf ("spi_xfer: rxbuf after xfer\n");
memdump ((void *) qsmcm->qsmcm_recram, 32); /* dump of rxbuf after transmit */
printf ("\nspi_xfer: commbuf after xfer\n");
memdump ((void *) qsmcm->qsmcm_comdram, 32); /* dump of txbuf before transmit */
printf ("\n");
#endif
return count;
}
#endif /* CONFIG_SPI */
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