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Diffstat (limited to 'cpu/mpc5xx/spi.c')
| -rw-r--r-- | cpu/mpc5xx/spi.c | 416 |
1 files changed, 416 insertions, 0 deletions
diff --git a/cpu/mpc5xx/spi.c b/cpu/mpc5xx/spi.c new file mode 100644 index 0000000..797d0c9 --- /dev/null +++ b/cpu/mpc5xx/spi.c @@ -0,0 +1,416 @@ +/* + * 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 *) CFG_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 | (CFG_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 |= (CFG_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 *) CFG_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 *) CFG_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 *) CFG_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 | CFG_SPI_CS_ACT; /* CS3 is connected to the SPI EEPROM */ + + qsmcm->qsmcm_comdram[i] = CFG_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 */ + + |