upstream u-boot with additional patches for our devices/boards:
https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ;
Gbit ethernet patch for some LIME2 revisions ;
with SPI flash support
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
133 lines
3.7 KiB
133 lines
3.7 KiB
/*
|
|
* (C) Copyright 2002
|
|
* Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
|
|
*
|
|
* Influenced by code from:
|
|
* 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
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <spi.h>
|
|
|
|
#if defined(CONFIG_SOFT_SPI)
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* Definitions
|
|
*/
|
|
|
|
#ifdef DEBUG_SPI
|
|
#define PRINTD(fmt,args...) printf (fmt ,##args)
|
|
#else
|
|
#define PRINTD(fmt,args...)
|
|
#endif
|
|
|
|
|
|
/*=====================================================================*/
|
|
/* Public Functions */
|
|
/*=====================================================================*/
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* Initialization
|
|
*/
|
|
void spi_init (void)
|
|
{
|
|
#ifdef SPI_INIT
|
|
volatile immap_t *immr = (immap_t *)CFG_IMMR;
|
|
|
|
SPI_INIT;
|
|
#endif
|
|
}
|
|
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* SPI transfer
|
|
*
|
|
* This writes "bitlen" bits out the SPI MOSI port and simultaneously clocks
|
|
* "bitlen" bits in the SPI MISO port. That's just the way SPI works.
|
|
*
|
|
* The source of the outgoing bits is the "dout" parameter and the
|
|
* destination of the input bits is the "din" parameter. Note that "dout"
|
|
* and "din" can point to the same memory location, in which case the
|
|
* input data overwrites the output data (since both are buffered by
|
|
* temporary variables, this is OK).
|
|
*
|
|
* If the chipsel() function is not NULL, it is called with a parameter
|
|
* of '1' (chip select active) at the start of the transfer and again with
|
|
* a parameter of '0' at the end of the transfer.
|
|
*
|
|
* If the chipsel() function _is_ NULL, it the responsibility of the
|
|
* caller to make the appropriate chip select active before calling
|
|
* spi_xfer() and making it inactive after spi_xfer() returns.
|
|
*/
|
|
int spi_xfer(spi_chipsel_type chipsel, int bitlen, uchar *dout, uchar *din)
|
|
{
|
|
volatile immap_t *immr = (immap_t *)CFG_IMMR;
|
|
uchar tmpdin = 0;
|
|
uchar tmpdout = 0;
|
|
int j;
|
|
|
|
PRINTD("spi_xfer: chipsel %08X dout %08X din %08X bitlen %d\n",
|
|
(int)chipsel, *(uint *)dout, *(uint *)din, bitlen);
|
|
|
|
if(chipsel != NULL) {
|
|
(*chipsel)(1); /* select the target chip */
|
|
}
|
|
|
|
for(j = 0; j < bitlen; j++) {
|
|
/*
|
|
* Check if it is time to work on a new byte.
|
|
*/
|
|
if((j % 8) == 0) {
|
|
tmpdout = *dout++;
|
|
if(j != 0) {
|
|
*din++ = tmpdin;
|
|
}
|
|
tmpdin = 0;
|
|
}
|
|
SPI_SCL(0);
|
|
SPI_SDA(tmpdout & 0x80);
|
|
SPI_DELAY;
|
|
SPI_SCL(1);
|
|
SPI_DELAY;
|
|
tmpdin <<= 1;
|
|
tmpdin |= SPI_READ;
|
|
tmpdout <<= 1;
|
|
}
|
|
/*
|
|
* If the number of bits isn't a multiple of 8, shift the last
|
|
* bits over to left-justify them. Then store the last byte
|
|
* read in.
|
|
*/
|
|
if((bitlen % 8) != 0)
|
|
tmpdin <<= 8 - (bitlen % 8);
|
|
*din++ = tmpdin;
|
|
|
|
SPI_SCL(0); /* SPI wants the clock left low for idle */
|
|
|
|
if(chipsel != NULL) {
|
|
(*chipsel)(0); /* deselect the target chip */
|
|
|
|
}
|
|
|
|
return(0);
|
|
}
|
|
|
|
#endif /* CONFIG_SOFT_SPI */
|
|
|