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 (file)
--- 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 @@ int board_init(void)
 }
 
 #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 @@ int misc_init_r(void)
 #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 (file)
--- 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 */

diff --git a/include/configs/lacie_kw.h b/include/configs/lacie_kw.h
index 09b5798..e2b3b21 100644 (file)
--- a/include/configs/lacie_kw.h
+++ b/include/configs/lacie_kw.h
@@ -120,10 +120,14 @@
 #endif
 
 /*
+ * Enable platform initialisation via misc_init_r() function
+ */
+#define CONFIG_MISC_INIT_R
+
+/*
  * Ethernet Driver configuration
  */
 #ifdef CONFIG_CMD_NET
-#define CONFIG_MISC_INIT_R /* Call misc_init_r() to initialize MAC address */
 #define CONFIG_MVGBE_PORTS             {1, 0} /* enable port 0 only */
 #define CONFIG_NETCONSOLE
 #endif
@@ -153,6 +157,9 @@
 #define CONFIG_SYS_I2C_EEPROM_ADDR             0x50
 #define CONFIG_SYS_EEPROM_PAGE_WRITE_BITS      4 /* 16-byte page size */
 #define CONFIG_SYS_I2C_EEPROM_ADDR_LEN         1 /* 8-bit device address */
+#if defined(CONFIG_NET2BIG_V2)
+#define CONFIG_SYS_I2C_G762_ADDR               0x3e
+#endif
 #endif /* CONFIG_CMD_I2C */
 
 /*