net2big_v2: initialize I2C fan at startup
This patch ensures minimal cooling for the net2big_v2 by automatically
starting the I2C fan (GMT G762) at low speed (2800 RPM).
Signed-off-by: Simon Guinot <simon.guinot@sequanux.org>
Acked-by: Prafulla Wadaskar <prafulla@marvell.com>
diff --git a/board/LaCie/net2big_v2/net2big_v2.c b/board/LaCie/net2big_v2/net2big_v2.c
index e524f35..6cca4fb 100644
--- a/board/LaCie/net2big_v2/net2big_v2.c
+++ b/board/LaCie/net2big_v2/net2big_v2.c
@@ -22,6 +22,7 @@
#include <common.h>
#include <command.h>
+#include <i2c.h>
#include <asm/arch/cpu.h>
#include <asm/arch/kirkwood.h>
#include <asm/arch/mpp.h>
@@ -92,8 +93,59 @@
}
#if defined(CONFIG_MISC_INIT_R)
+
+#if defined(CONFIG_CMD_I2C) && defined(CONFIG_SYS_I2C_G762_ADDR)
+/*
+ * Start I2C fan (GMT G762 controller)
+ */
+static void init_fan(void)
+{
+ u8 data;
+
+ i2c_set_bus_num(0);
+
+ /* Enable open-loop and PWM modes */
+ data = 0x20;
+ if (i2c_write(CONFIG_SYS_I2C_G762_ADDR,
+ G762_REG_FAN_CMD1, 1, &data, 1) != 0)
+ goto err;
+ data = 0;
+ if (i2c_write(CONFIG_SYS_I2C_G762_ADDR,
+ G762_REG_SET_CNT, 1, &data, 1) != 0)
+ goto err;
+ /*
+ * RPM to PWM (set_out register) fan speed conversion array:
+ * 0 0x00
+ * 1500 0x04
+ * 2800 0x08
+ * 3400 0x0C
+ * 3700 0x10
+ * 4400 0x20
+ * 4700 0x30
+ * 4800 0x50
+ * 5200 0x80
+ * 5400 0xC0
+ * 5500 0xFF
+ *
+ * Start fan at low speed (2800 RPM):
+ */
+ data = 0x08;
+ if (i2c_write(CONFIG_SYS_I2C_G762_ADDR,
+ G762_REG_SET_OUT, 1, &data, 1) != 0)
+ goto err;
+
+ return;
+err:
+ printf("Error: failed to start I2C fan @%02x\n",
+ CONFIG_SYS_I2C_G762_ADDR);
+}
+#else
+static void init_fan(void) {}
+#endif /* CONFIG_CMD_I2C && CONFIG_SYS_I2C_G762_ADDR */
+
int misc_init_r(void)
{
+ init_fan();
#if defined(CONFIG_CMD_I2C) && defined(CONFIG_SYS_I2C_EEPROM_ADDR)
if (!getenv("ethaddr")) {
uchar mac[6];
@@ -103,7 +155,7 @@
#endif
return 0;
}
-#endif
+#endif /* CONFIG_MISC_INIT_R */
#if defined(CONFIG_CMD_NET) && defined(CONFIG_RESET_PHY_R)
/* Configure and initialize PHY */
diff --git a/board/LaCie/net2big_v2/net2big_v2.h b/board/LaCie/net2big_v2/net2big_v2.h
index f9778f4..83537d6 100644
--- a/board/LaCie/net2big_v2/net2big_v2.h
+++ b/board/LaCie/net2big_v2/net2big_v2.h
@@ -32,4 +32,9 @@
/* Buttons */
#define NET2BIG_V2_GPIO_PUSH_BUTTON 34
+/* GMT G762 registers (I2C fan controller) */
+#define G762_REG_SET_CNT 0x00
+#define G762_REG_SET_OUT 0x03
+#define G762_REG_FAN_CMD1 0x04
+
#endif /* NET2BIG_V2_H */