get pin 19 working

1 files changed, 21 insertions, 0 deletions

diff --git a/1/main.c b/1/main.c
index 5410df7..d8ea7fc 100644
--- a/1/main.c
+++ b/1/main.c
@@ -1,6 +1,7 @@
 #include <linux/cdev.h>
 #include <linux/init.h>
 #include <linux/module.h>
+#include <linux/io.h>
 
 #include "fopdrv.h"
 #include "config.h"
@@ -63,6 +64,26 @@ static int mod_init(void) {
 
 	printk("%s() -> 0 (%d:%d)\n", __PRETTY_FUNCTION__, MAJOR(node), MINOR(node));
 	printk("one = %d, two = %d\n", one, not_named_two);
+
+	// configure gpio mux
+	uint32_t* conf_gpmc_a3 = ioremap(TI_AM335X_CM_GPMC_A3_ADDR, sizeof(ti_am335x_word_t));
+	if (conf_gpmc_a3 == NULL)
+		return -EINVAL;
+	barrier();
+	uint32_t val = ioread32(conf_gpmc_a3); rmb();
+	val &= ~0x7;
+	val |= 0x7;
+	iowrite32(val, conf_gpmc_a3); wmb();
+	iounmap(conf_gpmc_a3);
+
+	// configure output pin
+	ti_am335x_word_t* gpio1 = ioremap(TI_AM335X_GPIO1_ADDR, GPIO_REG_SIZE);
+	barrier();
+	ti_am335x_word_t oe_reg = ioread32(gpio1 + GPIO_OE); rmb();
+	oe_reg &= ~(1<<PIN); // 0=output
+	iowrite32(oe_reg, gpio1 + GPIO_OE); wmb();
+	iounmap(gpio1);
+
 	return 0;
 
 free_device: