From 5154e9f126c1d2ee8f5f93d9954f83d82b2d5e64 Mon Sep 17 00:00:00 2001
From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Date: Fri, 8 Jul 2011 14:51:27 +0900
Subject: usb: gadget: r8a66597-udc: Make BUSWAIT configurable through platform
 data

BUSWAIT is a 4-bit-wide value that controls the number of access waits
from the CPU to on-chip USB module. b'0000 inserts 0 wait (2 access
cycles) and b'1111 inserts 15 waits (17 access cycles, hardware
initial value), respectively.

BUSWAIT value depends on peripheral clock frequency supplied to on-chip
of each CPU, hence should be configurable through platform data.

Note that this patch assumes that b'0000 (0 wait, 2 access cycles) is
rerely used and considered as invalid. If valid 'buswait' data is not
provided by platform, initial b'1111 (15 waits, 17 access cycles) will
be applied as a safe default.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
---
 drivers/usb/gadget/r8a66597-udc.c | 6 +++++-
 include/linux/usb/r8a66597.h      | 3 +++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/r8a66597-udc.c b/drivers/usb/gadget/r8a66597-udc.c
index 4f3f1ce..834a020 100644
--- a/drivers/usb/gadget/r8a66597-udc.c
+++ b/drivers/usb/gadget/r8a66597-udc.c
@@ -576,7 +576,11 @@ static void init_controller(struct r8a66597 *r8a66597)
 	u16 endian = r8a66597->pdata->endian ? BIGEND : 0;
 
 	if (r8a66597->pdata->on_chip) {
-		r8a66597_bset(r8a66597, 0x04, SYSCFG1);
+		if (r8a66597->pdata->buswait)
+			r8a66597_write(r8a66597, r8a66597->pdata->buswait,
+					SYSCFG1);
+		else
+			r8a66597_write(r8a66597, 0x0f, SYSCFG1);
 		r8a66597_bset(r8a66597, HSE, SYSCFG0);
 
 		r8a66597_bclr(r8a66597, USBE, SYSCFG0);
diff --git a/include/linux/usb/r8a66597.h b/include/linux/usb/r8a66597.h
index 26d2167..6e1bfae 100644
--- a/include/linux/usb/r8a66597.h
+++ b/include/linux/usb/r8a66597.h
@@ -31,6 +31,9 @@ struct r8a66597_platdata {
 	/* This callback can control port power instead of DVSTCTR register. */
 	void (*port_power)(int port, int power);
 
+	/* This parameter is for BUSWAIT */
+	u16		buswait;
+
 	/* set one = on chip controller, set zero = external controller */
 	unsigned	on_chip:1;
 
-- 
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