Initial revision

[karo-tx-uboot.git] / common / cmd_spi.c

diff --git a/common/cmd_spi.c b/common/cmd_spi.c
new file mode 100644 (file)
index 0000000..ccf9cc2
--- /dev/null
+++ b/common/cmd_spi.c
@@ -0,0 +1,116 @@
+/*
+ * (C) Copyright 2002
+ * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
+ *
+ * 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
+ */
+
+/*
+ * SPI Read/Write Utilities
+ */
+
+#include <common.h>
+#include <command.h>
+#include <spi.h>
+#include <cmd_spi.h>
+
+#if (CONFIG_COMMANDS & CFG_CMD_SPI)
+
+#define MAX_SPI_BYTES  32      /* max number of bytes we can handle */
+
+/*
+ * External table of chip select functions (see the appropriate board
+ * support for the actual definition of the table).
+ */
+extern spi_chipsel_type spi_chipsel[];
+
+
+/*
+ * Values from last command.
+ */
+static int   device;
+static int   bitlen;
+static uchar dout[MAX_SPI_BYTES];
+static uchar din[MAX_SPI_BYTES];
+
+/*
+ * SPI read/write
+ *
+ * Syntax:
+ *   spi {dev} {num_bits} {dout}
+ *     {dev} is the device number for controlling chip select (see TBD)
+ *     {num_bits} is the number of bits to send & receive (base 10)
+ *     {dout} is a hexadecimal string of data to send
+ * The command prints out the hexadecimal string received via SPI.
+ */
+
+int do_spi (cmd_tbl_t *cmdtp, bd_t *bd, int flag, int argc, char *argv[])
+{
+       char  *cp = 0;
+       uchar tmp;
+       int   j;
+       int   rcode = 0;
+
+       /*
+        * We use the last specified parameters, unless new ones are
+        * entered.
+        */
+
+       if ((flag & CMD_FLAG_REPEAT) == 0)
+       {
+               if (argc >= 2)
+                       device = simple_strtoul(argv[1], NULL, 10);
+               if (argc >= 3)
+                       bitlen = simple_strtoul(argv[2], NULL, 10);
+               if (argc >= 4)
+               cp = argv[3];
+               for(j = 0; *cp; j++, cp++) {
+                       tmp = *cp - '0';
+                       if(tmp > 9)
+                               tmp -= ('A' - '0') - 10;
+                       if(tmp > 15)
+                               tmp -= ('a' - 'A');
+                       if(tmp > 15) {
+                               printf("Conversion error on %c, bailing out.\n", *cp);
+                               break;
+                       }
+                       if((j % 2) == 0)
+                               dout[j / 2] = (tmp << 4);
+                       else
+                               dout[j / 2] |= tmp;
+               }
+       }
+
+printf("spi_chipsel[%d] = %08X\n", device, (uint)spi_chipsel[device]);
+       if(spi_xfer(spi_chipsel[device], bitlen, dout, din) != 0) {
+               printf("Error with the SPI transaction.\n");
+               rcode = 1;
+       } else {
+               cp = din;
+               for(j = 0; j < ((bitlen + 7) / 8); j++) {
+                       printf("%02X", *cp++);
+               }
+               printf("\n");
+       }
+
+       return rcode;
+}
+
+#endif /* CFG_CMD_SPI */
+