328 lines
8.4 KiB
C
328 lines
8.4 KiB
C
/*
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* ehci-omap.c - driver for USBHOST on OMAP3/4 processors
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*
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* Bus Glue for the EHCI controllers in OMAP3/4
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* Tested on several OMAP3 boards, and OMAP4 Pandaboard
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*
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* Copyright (C) 2007-2013 Texas Instruments, Inc.
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* Author: Vikram Pandita <vikram.pandita@ti.com>
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* Author: Anand Gadiyar <gadiyar@ti.com>
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* Author: Keshava Munegowda <keshava_mgowda@ti.com>
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* Author: Roger Quadros <rogerq@ti.com>
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*
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* Copyright (C) 2009 Nokia Corporation
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* Contact: Felipe Balbi <felipe.balbi@nokia.com>
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*
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* Based on "ehci-fsl.c" and "ehci-au1xxx.c" ehci glue layers
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/io.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/usb/ulpi.h>
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#include <linux/pm_runtime.h>
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#include <linux/gpio.h>
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#include <linux/clk.h>
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#include <linux/usb.h>
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#include <linux/usb/hcd.h>
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#include <linux/of.h>
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#include <linux/dma-mapping.h>
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#include "ehci.h"
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#include <linux/platform_data/usb-omap.h>
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/* EHCI Register Set */
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#define EHCI_INSNREG04 (0xA0)
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#define EHCI_INSNREG04_DISABLE_UNSUSPEND (1 << 5)
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#define EHCI_INSNREG05_ULPI (0xA4)
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#define EHCI_INSNREG05_ULPI_CONTROL_SHIFT 31
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#define EHCI_INSNREG05_ULPI_PORTSEL_SHIFT 24
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#define EHCI_INSNREG05_ULPI_OPSEL_SHIFT 22
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#define EHCI_INSNREG05_ULPI_REGADD_SHIFT 16
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#define EHCI_INSNREG05_ULPI_EXTREGADD_SHIFT 8
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#define EHCI_INSNREG05_ULPI_WRDATA_SHIFT 0
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#define DRIVER_DESC "OMAP-EHCI Host Controller driver"
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static const char hcd_name[] = "ehci-omap";
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/*-------------------------------------------------------------------------*/
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struct omap_hcd {
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struct usb_phy *phy[OMAP3_HS_USB_PORTS]; /* one PHY for each port */
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int nports;
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};
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static inline void ehci_write(void __iomem *base, u32 reg, u32 val)
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{
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__raw_writel(val, base + reg);
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}
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static inline u32 ehci_read(void __iomem *base, u32 reg)
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{
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return __raw_readl(base + reg);
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}
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/* configure so an HC device and id are always provided */
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/* always called with process context; sleeping is OK */
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static struct hc_driver __read_mostly ehci_omap_hc_driver;
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static const struct ehci_driver_overrides ehci_omap_overrides __initdata = {
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.extra_priv_size = sizeof(struct omap_hcd),
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};
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static u64 omap_ehci_dma_mask = DMA_BIT_MASK(32);
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/**
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* ehci_hcd_omap_probe - initialize TI-based HCDs
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*
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* Allocates basic resources for this USB host controller, and
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* then invokes the start() method for the HCD associated with it
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* through the hotplug entry's driver_data.
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*/
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static int ehci_hcd_omap_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct usbhs_omap_platform_data *pdata = dev->platform_data;
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struct resource *res;
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struct usb_hcd *hcd;
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void __iomem *regs;
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int ret = -ENODEV;
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int irq;
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int i;
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struct omap_hcd *omap;
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if (usb_disabled())
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return -ENODEV;
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if (!dev->parent) {
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dev_err(dev, "Missing parent device\n");
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return -ENODEV;
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}
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/* For DT boot, get platform data from parent. i.e. usbhshost */
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if (dev->of_node) {
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pdata = dev->parent->platform_data;
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dev->platform_data = pdata;
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}
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if (!pdata) {
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dev_err(dev, "Missing platform data\n");
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return -ENODEV;
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}
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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dev_err(dev, "EHCI irq failed\n");
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return -ENODEV;
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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regs = devm_ioremap_resource(dev, res);
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if (IS_ERR(regs))
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return PTR_ERR(regs);
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/*
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* Right now device-tree probed devices don't get dma_mask set.
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* Since shared usb code relies on it, set it here for now.
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* Once we have dma capability bindings this can go away.
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*/
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if (!pdev->dev.dma_mask)
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pdev->dev.dma_mask = &omap_ehci_dma_mask;
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hcd = usb_create_hcd(&ehci_omap_hc_driver, dev,
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dev_name(dev));
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if (!hcd) {
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dev_err(dev, "Failed to create HCD\n");
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return -ENOMEM;
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}
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hcd->rsrc_start = res->start;
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hcd->rsrc_len = resource_size(res);
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hcd->regs = regs;
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hcd_to_ehci(hcd)->caps = regs;
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omap = (struct omap_hcd *)hcd_to_ehci(hcd)->priv;
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omap->nports = pdata->nports;
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platform_set_drvdata(pdev, hcd);
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/* get the PHY devices if needed */
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for (i = 0 ; i < omap->nports ; i++) {
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struct usb_phy *phy;
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/* get the PHY device */
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if (dev->of_node)
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phy = devm_usb_get_phy_by_phandle(dev, "phys", i);
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else
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phy = devm_usb_get_phy_dev(dev, i);
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if (IS_ERR(phy)) {
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/* Don't bail out if PHY is not absolutely necessary */
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if (pdata->port_mode[i] != OMAP_EHCI_PORT_MODE_PHY)
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continue;
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ret = PTR_ERR(phy);
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dev_err(dev, "Can't get PHY device for port %d: %d\n",
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i, ret);
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goto err_phy;
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}
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omap->phy[i] = phy;
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}
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pm_runtime_enable(dev);
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pm_runtime_get_sync(dev);
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/*
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* An undocumented "feature" in the OMAP3 EHCI controller,
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* causes suspended ports to be taken out of suspend when
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* the USBCMD.Run/Stop bit is cleared (for example when
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* we do ehci_bus_suspend).
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* This breaks suspend-resume if the root-hub is allowed
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* to suspend. Writing 1 to this undocumented register bit
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* disables this feature and restores normal behavior.
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*/
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ehci_write(regs, EHCI_INSNREG04,
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EHCI_INSNREG04_DISABLE_UNSUSPEND);
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ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
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if (ret) {
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dev_err(dev, "failed to add hcd with err %d\n", ret);
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goto err_pm_runtime;
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}
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/*
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* Bring PHYs out of reset.
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* Even though HSIC mode is a PHY-less mode, the reset
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* line exists between the chips and can be modelled
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* as a PHY device for reset control.
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*/
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for (i = 0; i < omap->nports; i++) {
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if (!omap->phy[i])
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continue;
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usb_phy_init(omap->phy[i]);
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/* bring PHY out of suspend */
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usb_phy_set_suspend(omap->phy[i], 0);
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}
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return 0;
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err_pm_runtime:
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pm_runtime_put_sync(dev);
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err_phy:
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for (i = 0; i < omap->nports; i++) {
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if (omap->phy[i])
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usb_phy_shutdown(omap->phy[i]);
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}
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usb_put_hcd(hcd);
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return ret;
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}
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/**
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* ehci_hcd_omap_remove - shutdown processing for EHCI HCDs
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* @pdev: USB Host Controller being removed
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*
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* Reverses the effect of usb_ehci_hcd_omap_probe(), first invoking
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* the HCD's stop() method. It is always called from a thread
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* context, normally "rmmod", "apmd", or something similar.
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*/
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static int ehci_hcd_omap_remove(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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struct omap_hcd *omap = (struct omap_hcd *)hcd_to_ehci(hcd)->priv;
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int i;
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usb_remove_hcd(hcd);
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for (i = 0; i < omap->nports; i++) {
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if (omap->phy[i])
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usb_phy_shutdown(omap->phy[i]);
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}
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usb_put_hcd(hcd);
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pm_runtime_put_sync(dev);
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pm_runtime_disable(dev);
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return 0;
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}
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static void ehci_hcd_omap_shutdown(struct platform_device *pdev)
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{
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struct usb_hcd *hcd = dev_get_drvdata(&pdev->dev);
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if (hcd->driver->shutdown)
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hcd->driver->shutdown(hcd);
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}
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static const struct of_device_id omap_ehci_dt_ids[] = {
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{ .compatible = "ti,ehci-omap" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, omap_ehci_dt_ids);
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static struct platform_driver ehci_hcd_omap_driver = {
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.probe = ehci_hcd_omap_probe,
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.remove = ehci_hcd_omap_remove,
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.shutdown = ehci_hcd_omap_shutdown,
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/*.suspend = ehci_hcd_omap_suspend, */
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/*.resume = ehci_hcd_omap_resume, */
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.driver = {
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.name = hcd_name,
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.of_match_table = of_match_ptr(omap_ehci_dt_ids),
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}
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};
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/*-------------------------------------------------------------------------*/
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static int __init ehci_omap_init(void)
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{
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if (usb_disabled())
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return -ENODEV;
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pr_info("%s: " DRIVER_DESC "\n", hcd_name);
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ehci_init_driver(&ehci_omap_hc_driver, &ehci_omap_overrides);
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return platform_driver_register(&ehci_hcd_omap_driver);
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}
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module_init(ehci_omap_init);
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static void __exit ehci_omap_cleanup(void)
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{
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platform_driver_unregister(&ehci_hcd_omap_driver);
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}
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module_exit(ehci_omap_cleanup);
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MODULE_ALIAS("platform:ehci-omap");
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MODULE_AUTHOR("Texas Instruments, Inc.");
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MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
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MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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