b76032396d
Since the controller on R-Car Gen3 doesn't have any status registers
to detect initialization (LPSTS.SUSPM = 1) and the initialization needs
up to 45 usec, this patch adds wait after the initialization. Otherwise,
writing other registers (e.g. INTENB0) will fail.
Fixes: de18757e27 ("usb: renesas_usbhs: add R-Car Gen3 power control")
Cc: <stable@vger.kernel.org> # v4.6+
Cc: <balbi@kernel.org>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
/*
|
|
* Renesas USB driver R-Car Gen. 3 initialization and power control
|
|
*
|
|
* Copyright (C) 2016 Renesas Electronics Corporation
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
*/
|
|
|
|
#include <linux/delay.h>
|
|
#include <linux/io.h>
|
|
#include "common.h"
|
|
#include "rcar3.h"
|
|
|
|
#define LPSTS 0x102
|
|
#define UGCTRL2 0x184 /* 32-bit register */
|
|
|
|
/* Low Power Status register (LPSTS) */
|
|
#define LPSTS_SUSPM 0x4000
|
|
|
|
/* USB General control register 2 (UGCTRL2), bit[31:6] should be 0 */
|
|
#define UGCTRL2_RESERVED_3 0x00000001 /* bit[3:0] should be B'0001 */
|
|
#define UGCTRL2_USB0SEL_OTG 0x00000030
|
|
|
|
static void usbhs_write32(struct usbhs_priv *priv, u32 reg, u32 data)
|
|
{
|
|
iowrite32(data, priv->base + reg);
|
|
}
|
|
|
|
static int usbhs_rcar3_power_ctrl(struct platform_device *pdev,
|
|
void __iomem *base, int enable)
|
|
{
|
|
struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
|
|
|
|
usbhs_write32(priv, UGCTRL2, UGCTRL2_RESERVED_3 | UGCTRL2_USB0SEL_OTG);
|
|
|
|
if (enable) {
|
|
usbhs_bset(priv, LPSTS, LPSTS_SUSPM, LPSTS_SUSPM);
|
|
/* The controller on R-Car Gen3 needs to wait up to 45 usec */
|
|
udelay(45);
|
|
} else {
|
|
usbhs_bset(priv, LPSTS, LPSTS_SUSPM, 0);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int usbhs_rcar3_get_id(struct platform_device *pdev)
|
|
{
|
|
return USBHS_GADGET;
|
|
}
|
|
|
|
const struct renesas_usbhs_platform_callback usbhs_rcar3_ops = {
|
|
.power_ctrl = usbhs_rcar3_power_ctrl,
|
|
.get_id = usbhs_rcar3_get_id,
|
|
};
|