eb-w1: initialize onewire in case wrpc did not

This is useful for example when using a secondary onewire controller.

eb-w1: initialize onewire in case wrpc did not
This is useful for example when using a secondary onewire controller.
a949b81b · Wesley W. Terpstra · 592db092 · a949b81b · a949b81b
Commit a949b81b authored Jun 03, 2015 by Wesley W. Terpstra
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eb-w1-write.c tools/eb-w1-write.c +1 -0

eb-w1.c tools/eb-w1.c +11 -0

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--- a/tools/eb-w1-write.c
+++ b/tools/eb-w1-write.c
@@ -41,6 +41,7 @@ static int write_w1(int w1base, int w1len)
 	uint8_t buf[w1len];
 	int i;

+	wrpc_w1_init();
 	w1_scan_bus(&wrpc_w1_bus);

 	if (verbose) { /* code borrowed from dev/w1.c -- "w1" shell command */

--- a/tools/eb-w1.c
+++ b/tools/eb-w1.c
@@ -66,6 +66,17 @@ static void w1_write_bit(struct w1_bus *bus, int bit)
 	__wait_cycle(device);
 }

+#define WB_CLOCK   62500000
+#define CLK_DIV_NOR (WB_CLOCK / 200000 - 1)	/* normal mode */
+#define CLK_DIV_OVD (WB_CLOCK / 1000000 - 1)	/* overdrive mode (not used) */
+void wrpc_w1_init(void)
+{
+    eb_data_t data = ((CLK_DIV_NOR & SOCKIT_OWM_CDR_N_MSK) |
+                      ((CLK_DIV_OVD << SOCKIT_OWM_CDR_O_OFST) &
+                       SOCKIT_OWM_CDR_O_MSK));
+    eb_device_write(device, BASE_ONEWIRE+4, EB_DATA32|EB_BIG_ENDIAN, data, 0, 0);
+}
+
 struct w1_ops wrpc_w1_ops = {
 	.reset = w1_reset,
 	.read_bit = w1_read_bit,