From: Christian Lamparter <chunkeey@googlemail.com>
Date: Sun, 14 Feb 2016 23:33:56 +0000 (+0100)
Subject: carl9170 firmware: add get_random_u16 helper
X-Git-Url: https://jxself.org/git/?p=carl9170fw.git;a=commitdiff_plain;h=b16e4b8d1a59abc67e1e7f2f4a5d297fbac6ee73

carl9170 firmware: add get_random_u16 helper

The HW has a built-in random number generator. This
patch adds a convenient helper to get random 16-bit
values in the firmware.

Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
---

diff --git a/carlfw/include/gpio.h b/carlfw/include/gpio.h
index a9c0b88..56c554a 100644
--- a/carlfw/include/gpio.h
+++ b/carlfw/include/gpio.h
@@ -36,6 +36,11 @@ static inline __inline void led_set(const unsigned int ledstate)
 	set(AR9170_GPIO_REG_PORT_DATA, ledstate);
 }
 
+static inline __inline u16 get_random_u16(void)
+{
+	return getw(AR9170_RAND_REG_NUM);
+}
+
 #ifdef CONFIG_CARL9170FW_GPIO_INTERRUPT
 
 void gpio_timer(void);
diff --git a/carlfw/include/io.h b/carlfw/include/io.h
index d480594..5bdc821 100644
--- a/carlfw/include/io.h
+++ b/carlfw/include/io.h
@@ -149,4 +149,9 @@ static inline __inline void orb(const volatile uint32_t addr, const volatile uin
 	setb(addr, getb(addr) | val);
 }
 
+static inline __inline uint16_t getw(const volatile uint32_t addr)
+{
+	return readw((const volatile void *) addr);
+}
+
 #endif /* __CARL9170FW_IO_H */