sh: Improve kfr2r09 serial port setup code

This patch improves the serial port communication quality
of port YC401 on the KFR2R09 board. With this fix serial
console is fine at 115200 - up and down keys now work as
expected. Thanks to Hirohide Yamasaki for this fix.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

diff --git a/arch/sh/boards/mach-kfr2r09/setup.c b/arch/sh/boards/mach-kfr2r09/setup.c
index e755bad..87438d6 100644 (file)
--- a/arch/sh/boards/mach-kfr2r09/setup.c
+++ b/arch/sh/boards/mach-kfr2r09/setup.c
@@ -414,11 +414,59 @@ static int kfr2r09_usb0_gadget_i2c_setup(void)
 
        return 0;
 }
+
+static int kfr2r09_serial_i2c_setup(void)
+{
+       struct i2c_adapter *a;
+       struct i2c_msg msg;
+       unsigned char buf[2];
+       int ret;
+
+       a = i2c_get_adapter(0);
+       if (!a)
+               return -ENODEV;
+
+       /* set bit 6 (the 7th bit) of chip at 0x09, register 0x13 */
+       buf[0] = 0x13;
+       msg.addr = 0x09;
+       msg.buf = buf;
+       msg.len = 1;
+       msg.flags = 0;
+       ret = i2c_transfer(a, &msg, 1);
+       if (ret != 1)
+               return -ENODEV;
+
+       buf[0] = 0;
+       msg.addr = 0x09;
+       msg.buf = buf;
+       msg.len = 1;
+       msg.flags = I2C_M_RD;
+       ret = i2c_transfer(a, &msg, 1);
+       if (ret != 1)
+               return -ENODEV;
+
+       buf[1] = buf[0] | (1 << 6);
+       buf[0] = 0x13;
+       msg.addr = 0x09;
+       msg.buf = buf;
+       msg.len = 2;
+       msg.flags = 0;
+       ret = i2c_transfer(a, &msg, 1);
+       if (ret != 1)
+               return -ENODEV;
+
+       return 0;
+}
 #else
 static int kfr2r09_usb0_gadget_i2c_setup(void)
 {
        return -ENODEV;
 }
+
+static int kfr2r09_serial_i2c_setup(void)
+{
+       return -ENODEV;
+}
 #endif
 
 static int kfr2r09_usb0_gadget_setup(void)
@@ -463,6 +511,9 @@ static int __init kfr2r09_devices_setup(void)
        /* enable SCIF1 serial port for YC401 console support */
        gpio_request(GPIO_FN_SCIF1_RXD, NULL);
        gpio_request(GPIO_FN_SCIF1_TXD, NULL);
+       kfr2r09_serial_i2c_setup(); /* ECONTMSK(bit6=L10ONEN) set 1 */
+       gpio_request(GPIO_PTG3, NULL); /* HPON_ON */
+       gpio_direction_output(GPIO_PTG3, 1); /* HPON_ON = H */
 
        /* setup NOR flash at CS0 */
        ctrl_outl(0x36db0400, BSC_CS0BCR);