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Diffstat (limited to 'board/esd/cpci405/cpci405.c')
-rw-r--r--board/esd/cpci405/cpci405.c167
1 files changed, 137 insertions, 30 deletions
diff --git a/board/esd/cpci405/cpci405.c b/board/esd/cpci405/cpci405.c
index 3f0ef1e..461e3a5 100644
--- a/board/esd/cpci405/cpci405.c
+++ b/board/esd/cpci405/cpci405.c
@@ -433,7 +433,14 @@ int checkboard (void)
#endif
if (ctermm2()) {
- printf("CTERM-M2 - Id=0x%02x)", *(unsigned char *)0xf0000400);
+ unsigned char str[4];
+
+ /*
+ * Read board-id and save in env-variable
+ */
+ sprintf(str, "%d", *(unsigned char *)0xf0000400);
+ setenv("boardid", str);
+ printf("CTERM-M2 - Id=%s)", str);
} else {
if (cpci405_host()) {
puts ("PCI Host Version)");
@@ -508,44 +515,144 @@ void ide_set_reset(int on)
#endif /* CONFIG_IDE_RESET */
#endif /* CONFIG_CPCI405_VER2 */
-#if 0 /* test-only */
-/* ------------------------------------------------------------------------- */
-u8 *dhcp_vendorex_prep (u8 * e)
+#ifdef CONFIG_CPCI405AB
+
+#define ONE_WIRE_CLEAR (*(volatile unsigned short *)0xf0400000 |= 0x0100)
+#define ONE_WIRE_SET (*(volatile unsigned short *)0xf0400000 &= ~0x0100)
+#define ONE_WIRE_GET (*(volatile unsigned short *)0xf0400002 & 0x1000)
+
+/*
+ * Generate a 1-wire reset, return 1 if no presence detect was found,
+ * return 0 otherwise.
+ * (NOTE: Does not handle alarm presence from DS2404/DS1994)
+ */
+int OWTouchReset(void)
{
- char *ptr;
-
-/* DHCP vendor-class-identifier = 60 */
- if ((ptr = getenv ("dhcp_vendor-class-identifier"))) {
- *e++ = 60;
- *e++ = strlen (ptr);
- while (*ptr)
- *e++ = *ptr++;
- }
-/* my DHCP_CLIENT_IDENTIFIER = 61 */
- if ((ptr = getenv ("dhcp_client_id"))) {
- *e++ = 61;
- *e++ = strlen (ptr);
- while (*ptr)
- *e++ = *ptr++;
+ int result;
+
+ ONE_WIRE_CLEAR;
+ udelay(480);
+ ONE_WIRE_SET;
+ udelay(70);
+
+ result = ONE_WIRE_GET;
+
+ udelay(410);
+ return result;
+}
+
+
+/*
+ * Send 1 a 1-wire write bit.
+ * Provide 10us recovery time.
+ */
+void OWWriteBit(int bit)
+{
+ if (bit) {
+ /*
+ * write '1' bit
+ */
+ ONE_WIRE_CLEAR;
+ udelay(6);
+ ONE_WIRE_SET;
+ udelay(64);
+ } else {
+ /*
+ * write '0' bit
+ */
+ ONE_WIRE_CLEAR;
+ udelay(60);
+ ONE_WIRE_SET;
+ udelay(10);
}
+}
+
- return e;
+/*
+ * Read a bit from the 1-wire bus and return it.
+ * Provide 10us recovery time.
+ */
+int OWReadBit(void)
+{
+ int result;
+
+ ONE_WIRE_CLEAR;
+ udelay(6);
+ ONE_WIRE_SET;
+ udelay(9);
+
+ result = ONE_WIRE_GET;
+
+ udelay(55);
+ return result;
}
-/* ------------------------------------------------------------------------- */
+void OWWriteByte(int data)
+{
+ int loop;
+
+ for (loop=0; loop<8; loop++) {
+ OWWriteBit(data & 0x01);
+ data >>= 1;
+ }
+}
+
-u8 *dhcp_vendorex_proc (u8 * popt)
+int OWReadByte(void)
{
- if (*popt == 61)
- return (u8 *)-1;
- if (*popt == 43) {
- printf("|%s|", popt+4); /* test-only */
- return (u8 *)-1;
+ int loop, result = 0;
+
+ for (loop=0; loop<8; loop++) {
+ result >>= 1;
+ if (OWReadBit()) {
+ result |= 0x80;
+ }
}
- return NULL;
+
+ return result;
}
-/* ------------------------------------------------------------------------- */
-#endif /* test-only */
+
+int do_onewire(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+ volatile unsigned short val;
+ int result;
+ int i;
+ unsigned char ow_id[6];
+ unsigned char str[32];
+ unsigned char ow_crc;
+
+ /*
+ * Clear 1-wire bit (open drain with pull-up)
+ */
+ val = *(volatile unsigned short *)0xf0400000;
+ val &= ~0x1000; /* clear 1-wire bit */
+ *(volatile unsigned short *)0xf0400000 = val;
+
+ result = OWTouchReset();
+ if (result != 0) {
+ puts("No 1-wire device detected!\n");
+ }
+
+ OWWriteByte(0x33); /* send read rom command */
+ OWReadByte(); /* skip family code ( == 0x01) */
+ for (i=0; i<6; i++) {
+ ow_id[i] = OWReadByte();
+ }
+ ow_crc = OWReadByte(); /* read crc */
+
+ sprintf(str, "%08X%04X", *(unsigned int *)&ow_id[0], *(unsigned short *)&ow_id[4]);
+ printf("Setting environment variable 'ow_id' to %s\n", str);
+ setenv("ow_id", str);
+
+ return 0;
+}
+U_BOOT_CMD(
+ onewire, 1, 1, do_onewire,
+ "onewire - Read 1-write ID\n",
+ NULL
+ );
+
+#endif /* CONFIG_CPCI405AB */