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Commit e6d8460a authored by Magnus Damm's avatar Magnus Damm Committed by Paul Mundt
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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: default avatarMagnus Damm <damm@opensource.se>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent fae43399

arch/sh/boards/mach-kfr2r09/setup.c

+51 −0
Original line number Diff line number Diff line
@@ -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);