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Merge tag 'xceiv-for-v3.8' of git://git.kernel.org/pub/scm/linux/kern…
…el/git/balbi/usb into USB-next Pull USB phy patches from Felipe: "usb: phy: patches for v3.8 merge window Not too many patches this time. First two patches are only cleanups where one of them switches over to module_platform_driver macro and the second removes inclusion of <mach/iomap.h> and is part of a bigger set of include cleanups from the Tegra folks. The only substantial change here is the addition of a driver for Renesas' R-Car USB Phy controller."
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/* | ||
* Renesas R-Car USB phy driver | ||
* | ||
* Copyright (C) 2012 Renesas Solutions Corp. | ||
* Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> | ||
* | ||
* 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. | ||
*/ | ||
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#include <linux/delay.h> | ||
#include <linux/io.h> | ||
#include <linux/usb/otg.h> | ||
#include <linux/platform_device.h> | ||
#include <linux/spinlock.h> | ||
#include <linux/module.h> | ||
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/* USBH common register */ | ||
#define USBPCTRL0 0x0800 | ||
#define USBPCTRL1 0x0804 | ||
#define USBST 0x0808 | ||
#define USBEH0 0x080C | ||
#define USBOH0 0x081C | ||
#define USBCTL0 0x0858 | ||
#define EIIBC1 0x0094 | ||
#define EIIBC2 0x009C | ||
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/* USBPCTRL1 */ | ||
#define PHY_RST (1 << 2) | ||
#define PLL_ENB (1 << 1) | ||
#define PHY_ENB (1 << 0) | ||
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/* USBST */ | ||
#define ST_ACT (1 << 31) | ||
#define ST_PLL (1 << 30) | ||
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struct rcar_usb_phy_priv { | ||
struct usb_phy phy; | ||
spinlock_t lock; | ||
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void __iomem *reg0; | ||
void __iomem *reg1; | ||
int counter; | ||
}; | ||
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#define usb_phy_to_priv(p) container_of(p, struct rcar_usb_phy_priv, phy) | ||
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/* | ||
* USB initial/install operation. | ||
* | ||
* This function setup USB phy. | ||
* The used value and setting order came from | ||
* [USB :: Initial setting] on datasheet. | ||
*/ | ||
static int rcar_usb_phy_init(struct usb_phy *phy) | ||
{ | ||
struct rcar_usb_phy_priv *priv = usb_phy_to_priv(phy); | ||
struct device *dev = phy->dev; | ||
void __iomem *reg0 = priv->reg0; | ||
void __iomem *reg1 = priv->reg1; | ||
int i; | ||
u32 val; | ||
unsigned long flags; | ||
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spin_lock_irqsave(&priv->lock, flags); | ||
if (priv->counter++ == 0) { | ||
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/* | ||
* USB phy start-up | ||
*/ | ||
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/* (1) USB-PHY standby release */ | ||
iowrite32(PHY_ENB, (reg0 + USBPCTRL1)); | ||
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/* (2) start USB-PHY internal PLL */ | ||
iowrite32(PHY_ENB | PLL_ENB, (reg0 + USBPCTRL1)); | ||
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/* (3) USB module status check */ | ||
for (i = 0; i < 1024; i++) { | ||
udelay(10); | ||
val = ioread32(reg0 + USBST); | ||
if (val == (ST_ACT | ST_PLL)) | ||
break; | ||
} | ||
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if (val != (ST_ACT | ST_PLL)) { | ||
dev_err(dev, "USB phy not ready\n"); | ||
goto phy_init_end; | ||
} | ||
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/* (4) USB-PHY reset clear */ | ||
iowrite32(PHY_ENB | PLL_ENB | PHY_RST, (reg0 + USBPCTRL1)); | ||
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/* set platform specific port settings */ | ||
iowrite32(0x00000000, (reg0 + USBPCTRL0)); | ||
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/* | ||
* EHCI IP internal buffer setting | ||
* EHCI IP internal buffer enable | ||
* | ||
* These are recommended value of a datasheet | ||
* see [USB :: EHCI internal buffer setting] | ||
*/ | ||
iowrite32(0x00ff0040, (reg0 + EIIBC1)); | ||
iowrite32(0x00ff0040, (reg1 + EIIBC1)); | ||
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iowrite32(0x00000001, (reg0 + EIIBC2)); | ||
iowrite32(0x00000001, (reg1 + EIIBC2)); | ||
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/* | ||
* Bus alignment settings | ||
*/ | ||
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/* (1) EHCI bus alignment (little endian) */ | ||
iowrite32(0x00000000, (reg0 + USBEH0)); | ||
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/* (1) OHCI bus alignment (little endian) */ | ||
iowrite32(0x00000000, (reg0 + USBOH0)); | ||
} | ||
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phy_init_end: | ||
spin_unlock_irqrestore(&priv->lock, flags); | ||
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return 0; | ||
} | ||
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static void rcar_usb_phy_shutdown(struct usb_phy *phy) | ||
{ | ||
struct rcar_usb_phy_priv *priv = usb_phy_to_priv(phy); | ||
void __iomem *reg0 = priv->reg0; | ||
unsigned long flags; | ||
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spin_lock_irqsave(&priv->lock, flags); | ||
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if (priv->counter-- == 1) { /* last user */ | ||
iowrite32(0x00000000, (reg0 + USBPCTRL0)); | ||
iowrite32(0x00000000, (reg0 + USBPCTRL1)); | ||
} | ||
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spin_unlock_irqrestore(&priv->lock, flags); | ||
} | ||
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static int __devinit rcar_usb_phy_probe(struct platform_device *pdev) | ||
{ | ||
struct rcar_usb_phy_priv *priv; | ||
struct resource *res0, *res1; | ||
struct device *dev = &pdev->dev; | ||
void __iomem *reg0, *reg1; | ||
int ret; | ||
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res0 = platform_get_resource(pdev, IORESOURCE_MEM, 0); | ||
res1 = platform_get_resource(pdev, IORESOURCE_MEM, 1); | ||
if (!res0 || !res1) { | ||
dev_err(dev, "Not enough platform resources\n"); | ||
return -EINVAL; | ||
} | ||
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/* | ||
* CAUTION | ||
* | ||
* Because this phy address is also mapped under OHCI/EHCI address area, | ||
* this driver can't use devm_request_and_ioremap(dev, res) here | ||
*/ | ||
reg0 = devm_ioremap_nocache(dev, res0->start, resource_size(res0)); | ||
reg1 = devm_ioremap_nocache(dev, res1->start, resource_size(res1)); | ||
if (!reg0 || !reg1) { | ||
dev_err(dev, "ioremap error\n"); | ||
return -ENOMEM; | ||
} | ||
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | ||
if (!priv) { | ||
dev_err(dev, "priv data allocation error\n"); | ||
return -ENOMEM; | ||
} | ||
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priv->reg0 = reg0; | ||
priv->reg1 = reg1; | ||
priv->counter = 0; | ||
priv->phy.dev = dev; | ||
priv->phy.label = dev_name(dev); | ||
priv->phy.init = rcar_usb_phy_init; | ||
priv->phy.shutdown = rcar_usb_phy_shutdown; | ||
spin_lock_init(&priv->lock); | ||
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ret = usb_add_phy(&priv->phy, USB_PHY_TYPE_USB2); | ||
if (ret < 0) { | ||
dev_err(dev, "usb phy addition error\n"); | ||
return ret; | ||
} | ||
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platform_set_drvdata(pdev, priv); | ||
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return ret; | ||
} | ||
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static int __devexit rcar_usb_phy_remove(struct platform_device *pdev) | ||
{ | ||
struct rcar_usb_phy_priv *priv = platform_get_drvdata(pdev); | ||
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usb_remove_phy(&priv->phy); | ||
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return 0; | ||
} | ||
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static struct platform_driver rcar_usb_phy_driver = { | ||
.driver = { | ||
.name = "rcar_usb_phy", | ||
}, | ||
.probe = rcar_usb_phy_probe, | ||
.remove = __devexit_p(rcar_usb_phy_remove), | ||
}; | ||
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module_platform_driver(rcar_usb_phy_driver); | ||
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MODULE_LICENSE("GPL v2"); | ||
MODULE_DESCRIPTION("Renesas R-Car USB phy"); | ||
MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>"); |