Initial revision
This commit is contained in:
wdenk
parent
a2cecab6df
commit
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/*
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* (C) Copyright 2002
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* Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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/*
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* SPI Read/Write Utilities
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*/
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#include <common.h>
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#include <command.h>
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#include <spi.h>
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#include <cmd_spi.h>
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#if (CONFIG_COMMANDS & CFG_CMD_SPI)
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#define MAX_SPI_BYTES 32 /* max number of bytes we can handle */
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/*
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* External table of chip select functions (see the appropriate board
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* support for the actual definition of the table).
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*/
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extern spi_chipsel_type spi_chipsel[];
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/*
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* Values from last command.
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*/
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static int device;
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static int bitlen;
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static uchar dout[MAX_SPI_BYTES];
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static uchar din[MAX_SPI_BYTES];
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/*
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* SPI read/write
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*
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* Syntax:
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* spi {dev} {num_bits} {dout}
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* {dev} is the device number for controlling chip select (see TBD)
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* {num_bits} is the number of bits to send & receive (base 10)
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* {dout} is a hexadecimal string of data to send
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* The command prints out the hexadecimal string received via SPI.
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*/
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int do_spi (cmd_tbl_t *cmdtp, bd_t *bd, int flag, int argc, char *argv[])
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{
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char *cp = 0;
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uchar tmp;
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int j;
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int rcode = 0;
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/*
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* We use the last specified parameters, unless new ones are
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* entered.
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*/
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if ((flag & CMD_FLAG_REPEAT) == 0)
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{
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if (argc >= 2)
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device = simple_strtoul(argv[1], NULL, 10);
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if (argc >= 3)
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bitlen = simple_strtoul(argv[2], NULL, 10);
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if (argc >= 4)
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cp = argv[3];
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for(j = 0; *cp; j++, cp++) {
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tmp = *cp - '0';
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if(tmp > 9)
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tmp -= ('A' - '0') - 10;
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if(tmp > 15)
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tmp -= ('a' - 'A');
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if(tmp > 15) {
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printf("Conversion error on %c, bailing out.\n", *cp);
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break;
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}
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if((j % 2) == 0)
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dout[j / 2] = (tmp << 4);
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else
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dout[j / 2] |= tmp;
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}
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}
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printf("spi_chipsel[%d] = %08X\n", device, (uint)spi_chipsel[device]);
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if(spi_xfer(spi_chipsel[device], bitlen, dout, din) != 0) {
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printf("Error with the SPI transaction.\n");
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rcode = 1;
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} else {
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cp = din;
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for(j = 0; j < ((bitlen + 7) / 8); j++) {
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printf("%02X", *cp++);
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}
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printf("\n");
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}
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return rcode;
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}
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#endif /* CFG_CMD_SPI */
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@ -0,0 +1,138 @@
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/*
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* (C) Copyright 2002
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* Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
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*
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* Influenced by code from:
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <spi.h>
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#if defined(CONFIG_SOFT_SPI)
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#define DEBUG_SPI
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/*-----------------------------------------------------------------------
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* Definitions
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*/
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#ifdef DEBUG_SPI
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#define PRINTD(fmt,args...) printf (fmt ,##args)
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#else
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#define PRINTD(fmt,args...)
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#endif
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/*=====================================================================*/
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/* Public Functions */
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/*=====================================================================*/
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/*-----------------------------------------------------------------------
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* Initialization
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*/
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void spi_init (void)
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{
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#ifdef SPI_INIT
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volatile immap_t *immr = (immap_t *)CFG_IMMR;
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SPI_INIT;
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#endif
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}
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/*-----------------------------------------------------------------------
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* SPI transfer
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*
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* This writes "bitlen" bits out the SPI MOSI port and simultaneously clocks
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* "bitlen" bits in the SPI MISO port. That's just the way SPI works.
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*
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* The source of the outgoing bits is the "dout" parameter and the
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* destination of the input bits is the "din" parameter. Note that "dout"
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* and "din" can point to the same memory location, in which case the
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* input data overwrites the output data (since both are buffered by
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* temporary variables, this is OK).
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*
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* If the chipsel() function is not NULL, it is called with a parameter
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* of '1' (chip select active) at the start of the transfer and again with
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* a parameter of '0' at the end of the transfer.
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*
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* If the chipsel() function _is_ NULL, it the responsibility of the
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* caller to make the appropriate chip select active before calling
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* spi_xfer() and making it inactive after spi_xfer() returns.
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*/
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int spi_xfer(spi_chipsel_type chipsel, int bitlen, uchar *dout, uchar *din)
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{
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volatile immap_t *immr = (immap_t *)CFG_IMMR;
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uchar tmpdin = 0;
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uchar tmpdout = 0;
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int j;
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PRINTD("spi_xfer: chipsel %08X dout %08X din %08X bitlen %d\n",
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(int)chipsel, *(uint *)dout, *(uint *)din, bitlen);
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if(chipsel != NULL) {
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(*chipsel)(1); /* select the target chip */
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}
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for(j = 0; j < bitlen; j++) {
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/*
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* Check if it is time to work on a new byte.
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*/
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if((j % 8) == 0) {
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tmpdout = *dout++;
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if(j != 0) {
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*din++ = tmpdin;
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}
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tmpdin = 0;
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}
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SPI_SCL(0);
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SPI_SDA(tmpdout & 0x80);
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SPI_DELAY;
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SPI_SCL(1);
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SPI_DELAY;
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tmpdin <<= 1;
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tmpdin |= SPI_READ;
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tmpdout <<= 1;
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}
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/*
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* If the number of bits isn't a multiple of 8, shift the last
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* bits over to left-justify them. Then store the last byte
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* read in.
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*/
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if((bitlen % 8) != 0)
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tmpdin <<= 8 - (bitlen % 8);
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*din++ = tmpdin;
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SPI_SCL(0); /* SPI wants the clock left low for idle */
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if(chipsel != NULL) {
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(*chipsel)(0); /* deselect the target chip */
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}
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return(0);
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}
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#endif /* CONFIG_SOFT_SPI */
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@ -0,0 +1,160 @@
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/*
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* (C) Copyright 2000
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <status_led.h>
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/*
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* The purpose of this code is to signal the operational status of a
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* target which usually boots over the network; while running in
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* PCBoot, a status LED is blinking. As soon as a valid BOOTP reply
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* message has been received, the LED is turned off. The Linux
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* kernel, once it is running, will start blinking the LED again,
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* with another frequency.
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*/
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/* ------------------------------------------------------------------------- */
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#ifdef CONFIG_STATUS_LED
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typedef struct {
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ulong mask;
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int state;
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int period;
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int cnt;
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} led_dev_t;
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led_dev_t led_dev[] = {
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{ STATUS_LED_BIT,
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STATUS_LED_STATE,
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STATUS_LED_PERIOD,
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0,
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},
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#if defined(STATUS_LED_BIT1)
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{ STATUS_LED_BIT1,
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STATUS_LED_STATE1,
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STATUS_LED_PERIOD1,
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0,
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},
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#endif
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#if defined(STATUS_LED_BIT2)
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{ STATUS_LED_BIT2,
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STATUS_LED_STATE2,
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STATUS_LED_PERIOD2,
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0,
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},
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#endif
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};
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#define MAX_LED_DEV (sizeof(led_dev)/sizeof(led_dev_t))
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static int status_led_init_done = 0;
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static void status_led_init (void)
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{
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volatile immap_t *immr = (immap_t *)CFG_IMMR;
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int i;
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for (i=0; i<MAX_LED_DEV; ++i) {
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led_dev_t *ld = &led_dev[i];
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immr->STATUS_LED_PAR &= ~(ld->mask);
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#ifdef STATUS_LED_ODR
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immr->STATUS_LED_ODR &= ~(ld->mask);
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#endif
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#if (STATUS_LED_ACTIVE == 0)
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if (ld->state == STATUS_LED_ON)
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immr->STATUS_LED_DAT &= ~(ld->mask);
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else
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immr->STATUS_LED_DAT |= ld->mask ;
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#else
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if (ld->state == STATUS_LED_ON)
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immr->STATUS_LED_DAT |= ld->mask ;
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else
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immr->STATUS_LED_DAT &= ~(ld->mask);
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#endif
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immr->STATUS_LED_DIR |= ld->mask ;
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}
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status_led_init_done = 1;
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}
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void status_led_tick (ulong timestamp)
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{
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volatile immap_t *immr = (immap_t *)CFG_IMMR;
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int i;
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if (!status_led_init_done)
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status_led_init();
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for (i=0; i<MAX_LED_DEV; ++i) {
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led_dev_t *ld = &led_dev[i];
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if (ld->state != STATUS_LED_BLINKING)
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continue;
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if (++(ld->cnt) >= ld->period) {
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immr->STATUS_LED_DAT ^= ld->mask;
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ld->cnt -= ld->period;
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}
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}
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}
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void status_led_set (int led, int state)
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{
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volatile immap_t *immr = (immap_t *)CFG_IMMR;
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led_dev_t *ld;
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if (led < 0 || led >= MAX_LED_DEV)
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return;
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if (!status_led_init_done)
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status_led_init();
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ld = &led_dev[led];
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switch (state) {
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default:
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return;
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case STATUS_LED_BLINKING:
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ld->cnt = 0; /* always start with full period */
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/* fall through */ /* always start with LED _ON_ */
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case STATUS_LED_ON:
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#if (STATUS_LED_ACTIVE == 0)
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immr->STATUS_LED_DAT &= ~(ld->mask);
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#else
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immr->STATUS_LED_DAT |= ld->mask ;
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#endif
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break;
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case STATUS_LED_OFF:
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#if (STATUS_LED_ACTIVE == 0)
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immr->STATUS_LED_DAT |= ld->mask ;
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#else
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immr->STATUS_LED_DAT &= ~(ld->mask);
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#endif
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break;
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}
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ld->state = state;
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}
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#endif /* CONFIG_STATUS_LED */
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