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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>.
*
* SPDX-License-Identifier: GPL-2.0+
*/
/*
* 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 */