371 lines
9.5 KiB
C
371 lines
9.5 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) 2007-2011 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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*
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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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* TODO (last updated Feb 27, 2010):
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* - add kernel-doc
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* - enable AUTOIDLE
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* - add suspend/resume
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* - add HSIC and TLL support
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* - convert to use hwmod and runtime PM
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*/
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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/regulator/consumer.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/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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/*-------------------------------------------------------------------------*/
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static const struct hc_driver ehci_omap_hc_driver;
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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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static void omap_ehci_soft_phy_reset(struct usb_hcd *hcd, u8 port)
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{
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unsigned long timeout = jiffies + msecs_to_jiffies(1000);
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unsigned reg = 0;
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reg = ULPI_FUNC_CTRL_RESET
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/* FUNCTION_CTRL_SET register */
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| (ULPI_SET(ULPI_FUNC_CTRL) << EHCI_INSNREG05_ULPI_REGADD_SHIFT)
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/* Write */
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| (2 << EHCI_INSNREG05_ULPI_OPSEL_SHIFT)
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/* PORTn */
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| ((port + 1) << EHCI_INSNREG05_ULPI_PORTSEL_SHIFT)
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/* start ULPI access*/
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| (1 << EHCI_INSNREG05_ULPI_CONTROL_SHIFT);
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ehci_write(hcd->regs, EHCI_INSNREG05_ULPI, reg);
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/* Wait for ULPI access completion */
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while ((ehci_read(hcd->regs, EHCI_INSNREG05_ULPI)
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& (1 << EHCI_INSNREG05_ULPI_CONTROL_SHIFT))) {
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cpu_relax();
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if (time_after(jiffies, timeout)) {
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dev_dbg(hcd->self.controller,
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"phy reset operation timed out\n");
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break;
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}
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}
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}
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static int omap_ehci_init(struct usb_hcd *hcd)
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{
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struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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int rc;
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struct usbhs_omap_platform_data *pdata;
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pdata = hcd->self.controller->platform_data;
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/* Hold PHYs in reset while initializing EHCI controller */
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if (pdata->phy_reset) {
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if (gpio_is_valid(pdata->reset_gpio_port[0]))
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gpio_set_value_cansleep(pdata->reset_gpio_port[0], 0);
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if (gpio_is_valid(pdata->reset_gpio_port[1]))
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gpio_set_value_cansleep(pdata->reset_gpio_port[1], 0);
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/* Hold the PHY in RESET for enough time till DIR is high */
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udelay(10);
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}
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/* Soft reset the PHY using PHY reset command over ULPI */
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if (pdata->port_mode[0] == OMAP_EHCI_PORT_MODE_PHY)
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omap_ehci_soft_phy_reset(hcd, 0);
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if (pdata->port_mode[1] == OMAP_EHCI_PORT_MODE_PHY)
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omap_ehci_soft_phy_reset(hcd, 1);
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/* we know this is the memory we want, no need to ioremap again */
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ehci->caps = hcd->regs;
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rc = ehci_setup(hcd);
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if (pdata->phy_reset) {
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/* Hold the PHY in RESET for enough time till
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* PHY is settled and ready
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*/
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udelay(10);
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if (gpio_is_valid(pdata->reset_gpio_port[0]))
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gpio_set_value_cansleep(pdata->reset_gpio_port[0], 1);
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if (gpio_is_valid(pdata->reset_gpio_port[1]))
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gpio_set_value_cansleep(pdata->reset_gpio_port[1], 1);
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}
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return rc;
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}
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static void disable_put_regulator(
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struct usbhs_omap_platform_data *pdata)
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{
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int i;
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for (i = 0 ; i < OMAP3_HS_USB_PORTS ; i++) {
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if (pdata->regulator[i]) {
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regulator_disable(pdata->regulator[i]);
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regulator_put(pdata->regulator[i]);
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}
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}
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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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/**
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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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char supply[7];
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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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irq = platform_get_irq_byname(pdev, "ehci-irq");
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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_byname(pdev,
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IORESOURCE_MEM, "ehci");
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if (!res) {
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dev_err(dev, "UHH EHCI get resource failed\n");
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return -ENODEV;
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}
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regs = ioremap(res->start, resource_size(res));
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if (!regs) {
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dev_err(dev, "UHH EHCI ioremap failed\n");
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return -ENOMEM;
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}
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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 with err %d\n", ret);
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ret = -ENOMEM;
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goto err_io;
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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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/* get ehci regulator and enable */
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for (i = 0 ; i < OMAP3_HS_USB_PORTS ; i++) {
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if (pdata->port_mode[i] != OMAP_EHCI_PORT_MODE_PHY) {
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pdata->regulator[i] = NULL;
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continue;
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}
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snprintf(supply, sizeof(supply), "hsusb%d", i);
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pdata->regulator[i] = regulator_get(dev, supply);
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if (IS_ERR(pdata->regulator[i])) {
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pdata->regulator[i] = NULL;
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dev_dbg(dev,
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"failed to get ehci port%d regulator\n", i);
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} else {
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regulator_enable(pdata->regulator[i]);
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}
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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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return 0;
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err_pm_runtime:
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disable_put_regulator(pdata);
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pm_runtime_put_sync(dev);
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usb_put_hcd(hcd);
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err_io:
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iounmap(regs);
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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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usb_remove_hcd(hcd);
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disable_put_regulator(dev->platform_data);
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iounmap(hcd->regs);
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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 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 = "ehci-omap",
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}
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};
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/*-------------------------------------------------------------------------*/
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static const struct hc_driver ehci_omap_hc_driver = {
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.description = hcd_name,
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.product_desc = "OMAP-EHCI Host Controller",
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.hcd_priv_size = sizeof(struct ehci_hcd),
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/*
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* generic hardware linkage
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*/
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.irq = ehci_irq,
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.flags = HCD_MEMORY | HCD_USB2,
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/*
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* basic lifecycle operations
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*/
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.reset = omap_ehci_init,
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.start = ehci_run,
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.stop = ehci_stop,
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.shutdown = ehci_shutdown,
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/*
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* managing i/o requests and associated device resources
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*/
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.urb_enqueue = ehci_urb_enqueue,
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.urb_dequeue = ehci_urb_dequeue,
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.endpoint_disable = ehci_endpoint_disable,
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.endpoint_reset = ehci_endpoint_reset,
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/*
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* scheduling support
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*/
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.get_frame_number = ehci_get_frame,
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/*
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* root hub support
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*/
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.hub_status_data = ehci_hub_status_data,
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.hub_control = ehci_hub_control,
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.bus_suspend = ehci_bus_suspend,
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.bus_resume = ehci_bus_resume,
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.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
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};
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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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