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// SPDX-License-Identifier: GPL-2.0
/*
* Renesas USB driver R-Car Gen. 3 initialization and power control
*
* Copyright (C) 2016 Renesas Electronics Corporation
*/
#include <linux/delay.h>
#include <linux/io.h>
#include "common.h"
#include "rcar3.h"
#define LPSTS 0x102
#define UGCTRL 0x180 /* 32-bit register */
#define UGCTRL2 0x184 /* 32-bit register */
#define UGSTS 0x188 /* 32-bit register */
/* Low Power Status register (LPSTS) */
#define LPSTS_SUSPM 0x4000
/* R-Car D3 only: USB General control register (UGCTRL) */
#define UGCTRL_PLLRESET 0x00000001
#define UGCTRL_CONNECT 0x00000004
/*
* USB General control register 2 (UGCTRL2)
* Remarks: bit[31:11] and bit[9:6] should be 0
*/
#define UGCTRL2_RESERVED_3 0x00000001 /* bit[3:0] should be B'0001 */
#define UGCTRL2_USB0SEL_EHCI 0x00000010
#define UGCTRL2_USB0SEL_HSUSB 0x00000020
#define UGCTRL2_USB0SEL_OTG 0x00000030
#define UGCTRL2_VBUSSEL 0x00000400
/* R-Car D3 only: USB General status register (UGSTS) */
#define UGSTS_LOCK 0x00000100
static void usbhs_write32(struct usbhs_priv *priv, u32 reg, u32 data)
{
iowrite32(data, priv->base + reg);
}
static u32 usbhs_read32(struct usbhs_priv *priv, u32 reg)
{
return ioread32(priv->base + reg);
}
static void usbhs_rcar3_set_ugctrl2(struct usbhs_priv *priv, u32 val)
{
usbhs_write32(priv, UGCTRL2, val | UGCTRL2_RESERVED_3);
}
static void usbhs_rcar3_set_usbsel(struct usbhs_priv *priv, bool ehci)
{
if (ehci)
usbhs_rcar3_set_ugctrl2(priv, UGCTRL2_USB0SEL_EHCI);
else
usbhs_rcar3_set_ugctrl2(priv, UGCTRL2_USB0SEL_HSUSB);
}
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_rcar3_set_ugctrl2(priv, UGCTRL2_USB0SEL_OTG | UGCTRL2_VBUSSEL);
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;
}
/* R-Car D3 needs to release UGCTRL.PLLRESET */
static int usbhs_rcar3_power_and_pll_ctrl(struct platform_device *pdev,
void __iomem *base, int enable)
{
struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
u32 val;
int timeout = 1000;
bool is_host = false;
if (enable) {
usbhs_write32(priv, UGCTRL, 0); /* release PLLRESET */
if (priv->edev)
is_host = extcon_get_state(priv->edev, EXTCON_USB_HOST);
usbhs_rcar3_set_usbsel(priv, is_host);
usbhs_bset(priv, LPSTS, LPSTS_SUSPM, LPSTS_SUSPM);
do {
val = usbhs_read32(priv, UGSTS);
udelay(1);
} while (!(val & UGSTS_LOCK) && timeout--);
usbhs_write32(priv, UGCTRL, UGCTRL_CONNECT);
} else {
usbhs_write32(priv, UGCTRL, 0);
usbhs_bset(priv, LPSTS, LPSTS_SUSPM, 0);
usbhs_write32(priv, UGCTRL, UGCTRL_PLLRESET);
}
return 0;
}
static int usbhs_rcar3_get_id(struct platform_device *pdev)
{
return USBHS_GADGET;
}
static int usbhs_rcar3_notifier(struct notifier_block *nb, unsigned long event,
void *data)
{
struct usbhs_priv *priv = container_of(nb, struct usbhs_priv, nb);
usbhs_rcar3_set_usbsel(priv, !!event);
return NOTIFY_DONE;
}
const struct renesas_usbhs_platform_callback usbhs_rcar3_ops = {
.power_ctrl = usbhs_rcar3_power_ctrl,
.get_id = usbhs_rcar3_get_id,
};
const struct renesas_usbhs_platform_callback usbhs_rcar3_with_pll_ops = {
.power_ctrl = usbhs_rcar3_power_and_pll_ctrl,
.get_id = usbhs_rcar3_get_id,
.notifier = usbhs_rcar3_notifier,
};
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