usb: phy: add R-Car USB phy driver
This patch adds Renesas R-Car USB phy driver. It supports R8A7779 chip at this point. R-Car has some USB controllers, but has only one phy-initializer. So, this driver is counting users. Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Kuninori Morimoto
Felipe Balbi
parent
ca21dda64b
commit
1789e52acc
3 changed files with 233 additions and 0 deletions
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@ -32,3 +32,15 @@ config MV_U3D_PHY
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help
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Enable this to support Marvell USB 3.0 phy controller for Marvell
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SoC.
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config USB_RCAR_PHY
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tristate "Renesas R-Car USB phy support"
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depends on USB || USB_GADGET
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select USB_OTG_UTILS
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help
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Say Y here to add support for the Renesas R-Car USB phy driver.
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This chip is typically used as USB phy for USB host, gadget.
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This driver supports: R8A7779
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To compile this driver as a module, choose M here: the
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module will be called rcar-phy.
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@ -8,3 +8,4 @@ obj-$(CONFIG_OMAP_USB2) += omap-usb2.o
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obj-$(CONFIG_USB_ISP1301) += isp1301.o
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obj-$(CONFIG_MV_U3D_PHY) += mv_u3d_phy.o
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obj-$(CONFIG_USB_EHCI_TEGRA) += tegra_usb_phy.o
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obj-$(CONFIG_USB_RCAR_PHY) += rcar-phy.o
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220
drivers/usb/phy/rcar-phy.c
Normal file
220
drivers/usb/phy/rcar-phy.c
Normal file
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@ -0,0 +1,220 @@
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/*
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* Renesas R-Car USB phy driver
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*
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* Copyright (C) 2012 Renesas Solutions Corp.
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* Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/usb/otg.h>
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#include <linux/platform_device.h>
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#include <linux/spinlock.h>
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#include <linux/module.h>
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/* USBH common register */
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#define USBPCTRL0 0x0800
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#define USBPCTRL1 0x0804
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#define USBST 0x0808
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#define USBEH0 0x080C
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#define USBOH0 0x081C
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#define USBCTL0 0x0858
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#define EIIBC1 0x0094
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#define EIIBC2 0x009C
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/* USBPCTRL1 */
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#define PHY_RST (1 << 2)
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#define PLL_ENB (1 << 1)
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#define PHY_ENB (1 << 0)
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/* USBST */
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#define ST_ACT (1 << 31)
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#define ST_PLL (1 << 30)
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struct rcar_usb_phy_priv {
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struct usb_phy phy;
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spinlock_t lock;
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void __iomem *reg0;
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void __iomem *reg1;
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int counter;
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};
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#define usb_phy_to_priv(p) container_of(p, struct rcar_usb_phy_priv, phy)
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/*
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* USB initial/install operation.
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*
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* This function setup USB phy.
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* The used value and setting order came from
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* [USB :: Initial setting] on datasheet.
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*/
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static int rcar_usb_phy_init(struct usb_phy *phy)
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{
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struct rcar_usb_phy_priv *priv = usb_phy_to_priv(phy);
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struct device *dev = phy->dev;
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void __iomem *reg0 = priv->reg0;
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void __iomem *reg1 = priv->reg1;
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int i;
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u32 val;
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unsigned long flags;
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spin_lock_irqsave(&priv->lock, flags);
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if (priv->counter++ == 0) {
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/*
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* USB phy start-up
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*/
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/* (1) USB-PHY standby release */
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iowrite32(PHY_ENB, (reg0 + USBPCTRL1));
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/* (2) start USB-PHY internal PLL */
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iowrite32(PHY_ENB | PLL_ENB, (reg0 + USBPCTRL1));
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/* (3) USB module status check */
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for (i = 0; i < 1024; i++) {
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udelay(10);
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val = ioread32(reg0 + USBST);
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if (val == (ST_ACT | ST_PLL))
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break;
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}
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if (val != (ST_ACT | ST_PLL)) {
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dev_err(dev, "USB phy not ready\n");
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goto phy_init_end;
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}
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/* (4) USB-PHY reset clear */
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iowrite32(PHY_ENB | PLL_ENB | PHY_RST, (reg0 + USBPCTRL1));
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/* set platform specific port settings */
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iowrite32(0x00000000, (reg0 + USBPCTRL0));
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/*
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* EHCI IP internal buffer setting
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* EHCI IP internal buffer enable
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*
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* These are recommended value of a datasheet
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* see [USB :: EHCI internal buffer setting]
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*/
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iowrite32(0x00ff0040, (reg0 + EIIBC1));
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iowrite32(0x00ff0040, (reg1 + EIIBC1));
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iowrite32(0x00000001, (reg0 + EIIBC2));
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iowrite32(0x00000001, (reg1 + EIIBC2));
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/*
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* Bus alignment settings
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*/
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/* (1) EHCI bus alignment (little endian) */
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iowrite32(0x00000000, (reg0 + USBEH0));
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/* (1) OHCI bus alignment (little endian) */
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iowrite32(0x00000000, (reg0 + USBOH0));
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}
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phy_init_end:
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spin_unlock_irqrestore(&priv->lock, flags);
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return 0;
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}
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static void rcar_usb_phy_shutdown(struct usb_phy *phy)
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{
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struct rcar_usb_phy_priv *priv = usb_phy_to_priv(phy);
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void __iomem *reg0 = priv->reg0;
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unsigned long flags;
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spin_lock_irqsave(&priv->lock, flags);
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if (priv->counter-- == 1) { /* last user */
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iowrite32(0x00000000, (reg0 + USBPCTRL0));
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iowrite32(0x00000000, (reg0 + USBPCTRL1));
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}
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spin_unlock_irqrestore(&priv->lock, flags);
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}
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static int __devinit rcar_usb_phy_probe(struct platform_device *pdev)
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{
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struct rcar_usb_phy_priv *priv;
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struct resource *res0, *res1;
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struct device *dev = &pdev->dev;
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void __iomem *reg0, *reg1;
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int ret;
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res0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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res1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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if (!res0 || !res1) {
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dev_err(dev, "Not enough platform resources\n");
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return -EINVAL;
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}
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/*
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* CAUTION
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*
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* Because this phy address is also mapped under OHCI/EHCI address area,
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* this driver can't use devm_request_and_ioremap(dev, res) here
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*/
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reg0 = devm_ioremap_nocache(dev, res0->start, resource_size(res0));
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reg1 = devm_ioremap_nocache(dev, res1->start, resource_size(res1));
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if (!reg0 || !reg1) {
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dev_err(dev, "ioremap error\n");
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return -ENOMEM;
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}
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv) {
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dev_err(dev, "priv data allocation error\n");
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return -ENOMEM;
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}
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priv->reg0 = reg0;
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priv->reg1 = reg1;
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priv->counter = 0;
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priv->phy.dev = dev;
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priv->phy.label = dev_name(dev);
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priv->phy.init = rcar_usb_phy_init;
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priv->phy.shutdown = rcar_usb_phy_shutdown;
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spin_lock_init(&priv->lock);
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ret = usb_add_phy(&priv->phy, USB_PHY_TYPE_USB2);
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if (ret < 0) {
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dev_err(dev, "usb phy addition error\n");
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return ret;
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}
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platform_set_drvdata(pdev, priv);
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return ret;
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}
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static int __devexit rcar_usb_phy_remove(struct platform_device *pdev)
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{
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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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}
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static struct platform_driver rcar_usb_phy_driver = {
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.driver = {
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.name = "rcar_usb_phy",
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},
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.probe = rcar_usb_phy_probe,
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.remove = __devexit_p(rcar_usb_phy_remove),
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};
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module_platform_driver(rcar_usb_phy_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Renesas R-Car USB phy");
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MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
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