450 lines
11 KiB
C
450 lines
11 KiB
C
// SPDX-License-Identifier: GPL-1.0+
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/*
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* OHCI HCD (Host Controller Driver) for USB.
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*
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* (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
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* (C) Copyright 2000-2005 David Brownell
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* (C) Copyright 2002 Hewlett-Packard Company
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*
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* OMAP Bus Glue
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*
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* Modified for OMAP by Tony Lindgren <tony@atomide.com>
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* Based on the 2.4 OMAP OHCI driver originally done by MontaVista Software Inc.
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* and on ohci-sa1111.c by Christopher Hoover <ch@hpl.hp.com>
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*
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* This file is licenced under the GPL.
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*/
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#include <linux/clk.h>
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#include <linux/dma-mapping.h>
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#include <linux/err.h>
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#include <linux/gpio/consumer.h>
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#include <linux/io.h>
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/module.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/signal.h>
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#include <linux/usb.h>
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#include <linux/usb/hcd.h>
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#include "ohci.h"
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#include <asm/io.h>
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#include <asm/mach-types.h>
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#include <mach/mux.h>
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#include <mach/hardware.h>
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#include <mach/usb.h>
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#define DRIVER_DESC "OHCI OMAP driver"
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struct ohci_omap_priv {
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struct clk *usb_host_ck;
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struct clk *usb_dc_ck;
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struct gpio_desc *power;
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struct gpio_desc *overcurrent;
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};
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static const char hcd_name[] = "ohci-omap";
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static struct hc_driver __read_mostly ohci_omap_hc_driver;
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#define hcd_to_ohci_omap_priv(h) \
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((struct ohci_omap_priv *)hcd_to_ohci(h)->priv)
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static void omap_ohci_clock_power(struct ohci_omap_priv *priv, int on)
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{
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if (on) {
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clk_enable(priv->usb_dc_ck);
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clk_enable(priv->usb_host_ck);
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/* guesstimate for T5 == 1x 32K clock + APLL lock time */
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udelay(100);
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} else {
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clk_disable(priv->usb_host_ck);
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clk_disable(priv->usb_dc_ck);
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}
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}
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/*
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* Board specific gang-switched transceiver power on/off.
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* NOTE: OSK supplies power from DC, not battery.
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*/
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static int omap_ohci_transceiver_power(struct ohci_omap_priv *priv, int on)
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{
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if (on) {
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if (machine_is_omap_innovator() && cpu_is_omap1510())
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__raw_writeb(__raw_readb(INNOVATOR_FPGA_CAM_USB_CONTROL)
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| ((1 << 5/*usb1*/) | (1 << 3/*usb2*/)),
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INNOVATOR_FPGA_CAM_USB_CONTROL);
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else if (priv->power)
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gpiod_set_value_cansleep(priv->power, 0);
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} else {
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if (machine_is_omap_innovator() && cpu_is_omap1510())
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__raw_writeb(__raw_readb(INNOVATOR_FPGA_CAM_USB_CONTROL)
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& ~((1 << 5/*usb1*/) | (1 << 3/*usb2*/)),
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INNOVATOR_FPGA_CAM_USB_CONTROL);
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else if (priv->power)
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gpiod_set_value_cansleep(priv->power, 1);
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}
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return 0;
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}
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#ifdef CONFIG_USB_OTG
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static void start_hnp(struct ohci_hcd *ohci)
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{
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struct usb_hcd *hcd = ohci_to_hcd(ohci);
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const unsigned port = hcd->self.otg_port - 1;
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unsigned long flags;
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u32 l;
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otg_start_hnp(hcd->usb_phy->otg);
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local_irq_save(flags);
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hcd->usb_phy->otg->state = OTG_STATE_A_SUSPEND;
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writel (RH_PS_PSS, &ohci->regs->roothub.portstatus [port]);
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l = omap_readl(OTG_CTRL);
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l &= ~OTG_A_BUSREQ;
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omap_writel(l, OTG_CTRL);
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local_irq_restore(flags);
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}
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#endif
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/*-------------------------------------------------------------------------*/
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static int ohci_omap_reset(struct usb_hcd *hcd)
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{
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struct ohci_hcd *ohci = hcd_to_ohci(hcd);
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struct omap_usb_config *config = dev_get_platdata(hcd->self.controller);
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struct ohci_omap_priv *priv = hcd_to_ohci_omap_priv(hcd);
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int need_transceiver = (config->otg != 0);
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int ret;
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dev_dbg(hcd->self.controller, "starting USB Controller\n");
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if (config->otg) {
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hcd->self.otg_port = config->otg;
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/* default/minimum OTG power budget: 8 mA */
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hcd->power_budget = 8;
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}
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/* boards can use OTG transceivers in non-OTG modes */
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need_transceiver = need_transceiver
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|| machine_is_omap_h2() || machine_is_omap_h3();
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/* XXX OMAP16xx only */
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if (config->ocpi_enable)
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config->ocpi_enable();
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#ifdef CONFIG_USB_OTG
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if (need_transceiver) {
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hcd->usb_phy = usb_get_phy(USB_PHY_TYPE_USB2);
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if (!IS_ERR_OR_NULL(hcd->usb_phy)) {
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int status = otg_set_host(hcd->usb_phy->otg,
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&ohci_to_hcd(ohci)->self);
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dev_dbg(hcd->self.controller, "init %s phy, status %d\n",
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hcd->usb_phy->label, status);
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if (status) {
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usb_put_phy(hcd->usb_phy);
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return status;
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}
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} else {
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return -EPROBE_DEFER;
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}
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hcd->skip_phy_initialization = 1;
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ohci->start_hnp = start_hnp;
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}
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#endif
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omap_ohci_clock_power(priv, 1);
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if (config->lb_reset)
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config->lb_reset();
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ret = ohci_setup(hcd);
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if (ret < 0)
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return ret;
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if (config->otg || config->rwc) {
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ohci->hc_control = OHCI_CTRL_RWC;
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writel(OHCI_CTRL_RWC, &ohci->regs->control);
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}
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/* board-specific power switching and overcurrent support */
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if (machine_is_omap_osk() || machine_is_omap_innovator()) {
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u32 rh = roothub_a (ohci);
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/* power switching (ganged by default) */
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rh &= ~RH_A_NPS;
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/* TPS2045 switch for internal transceiver (port 1) */
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if (machine_is_omap_osk()) {
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ohci_to_hcd(ohci)->power_budget = 250;
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rh &= ~RH_A_NOCP;
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/* gpio9 for overcurrent detction */
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omap_cfg_reg(W8_1610_GPIO9);
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/* for paranoia's sake: disable USB.PUEN */
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omap_cfg_reg(W4_USB_HIGHZ);
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}
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ohci_writel(ohci, rh, &ohci->regs->roothub.a);
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ohci->flags &= ~OHCI_QUIRK_HUB_POWER;
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} else if (machine_is_nokia770()) {
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/* We require a self-powered hub, which should have
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* plenty of power. */
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ohci_to_hcd(ohci)->power_budget = 0;
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}
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/* FIXME hub_wq hub requests should manage power switching */
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omap_ohci_transceiver_power(priv, 1);
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/* board init will have already handled HMC and mux setup.
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* any external transceiver should already be initialized
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* too, so all configured ports use the right signaling now.
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*/
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return 0;
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}
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/*-------------------------------------------------------------------------*/
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/**
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* ohci_hcd_omap_probe - initialize OMAP-based HCDs
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* @pdev: USB controller to probe
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*
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* Context: task context, might sleep
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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 ohci_hcd_omap_probe(struct platform_device *pdev)
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{
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int retval, irq;
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struct usb_hcd *hcd = 0;
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struct ohci_omap_priv *priv;
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if (pdev->num_resources != 2) {
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dev_err(&pdev->dev, "invalid num_resources: %i\n",
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pdev->num_resources);
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return -ENODEV;
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}
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if (pdev->resource[0].flags != IORESOURCE_MEM
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|| pdev->resource[1].flags != IORESOURCE_IRQ) {
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dev_err(&pdev->dev, "invalid resource type\n");
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return -ENODEV;
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}
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hcd = usb_create_hcd(&ohci_omap_hc_driver, &pdev->dev,
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dev_name(&pdev->dev));
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if (!hcd)
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return -ENOMEM;
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hcd->rsrc_start = pdev->resource[0].start;
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hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
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priv = hcd_to_ohci_omap_priv(hcd);
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/* Obtain two optional GPIO lines */
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priv->power = devm_gpiod_get_optional(&pdev->dev, "power", GPIOD_ASIS);
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if (IS_ERR(priv->power)) {
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retval = PTR_ERR(priv->power);
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goto err_put_hcd;
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}
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if (priv->power)
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gpiod_set_consumer_name(priv->power, "OHCI power");
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/*
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* This "overcurrent" GPIO line isn't really used in the code,
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* but has a designated hardware function.
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* TODO: implement proper overcurrent handling.
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*/
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priv->overcurrent = devm_gpiod_get_optional(&pdev->dev, "overcurrent",
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GPIOD_IN);
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if (IS_ERR(priv->overcurrent)) {
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retval = PTR_ERR(priv->overcurrent);
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goto err_put_hcd;
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}
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if (priv->overcurrent)
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gpiod_set_consumer_name(priv->overcurrent, "OHCI overcurrent");
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priv->usb_host_ck = clk_get(&pdev->dev, "usb_hhc_ck");
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if (IS_ERR(priv->usb_host_ck)) {
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retval = PTR_ERR(priv->usb_host_ck);
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goto err_put_hcd;
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}
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if (!cpu_is_omap15xx())
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priv->usb_dc_ck = clk_get(&pdev->dev, "usb_dc_ck");
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else
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priv->usb_dc_ck = clk_get(&pdev->dev, "lb_ck");
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if (IS_ERR(priv->usb_dc_ck)) {
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retval = PTR_ERR(priv->usb_dc_ck);
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goto err_put_host_ck;
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}
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if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
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dev_dbg(&pdev->dev, "request_mem_region failed\n");
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retval = -EBUSY;
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goto err_put_dc_ck;
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}
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hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
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if (!hcd->regs) {
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dev_err(&pdev->dev, "can't ioremap OHCI HCD\n");
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retval = -ENOMEM;
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goto err2;
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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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retval = -ENXIO;
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goto err3;
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}
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retval = usb_add_hcd(hcd, irq, 0);
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if (retval)
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goto err3;
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device_wakeup_enable(hcd->self.controller);
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return 0;
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err3:
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iounmap(hcd->regs);
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err2:
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release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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err_put_dc_ck:
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clk_put(priv->usb_dc_ck);
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err_put_host_ck:
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clk_put(priv->usb_host_ck);
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err_put_hcd:
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usb_put_hcd(hcd);
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return retval;
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}
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/* may be called with controller, bus, and devices active */
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/**
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* ohci_hcd_omap_remove - shutdown processing for OMAP-based HCDs
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* @pdev: USB Host Controller being removed
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*
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* Context: task context, might sleep
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*
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* Reverses the effect of ohci_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 ohci_hcd_omap_remove(struct platform_device *pdev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(pdev);
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struct ohci_omap_priv *priv = hcd_to_ohci_omap_priv(hcd);
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dev_dbg(hcd->self.controller, "stopping USB Controller\n");
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usb_remove_hcd(hcd);
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omap_ohci_clock_power(priv, 0);
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if (!IS_ERR_OR_NULL(hcd->usb_phy)) {
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(void) otg_set_host(hcd->usb_phy->otg, 0);
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usb_put_phy(hcd->usb_phy);
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}
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iounmap(hcd->regs);
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release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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clk_put(priv->usb_dc_ck);
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clk_put(priv->usb_host_ck);
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usb_put_hcd(hcd);
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return 0;
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}
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/*-------------------------------------------------------------------------*/
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#ifdef CONFIG_PM
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static int ohci_omap_suspend(struct platform_device *pdev, pm_message_t message)
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{
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struct usb_hcd *hcd = platform_get_drvdata(pdev);
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struct ohci_hcd *ohci = hcd_to_ohci(hcd);
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struct ohci_omap_priv *priv = hcd_to_ohci_omap_priv(hcd);
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bool do_wakeup = device_may_wakeup(&pdev->dev);
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int ret;
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if (time_before(jiffies, ohci->next_statechange))
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msleep(5);
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ohci->next_statechange = jiffies;
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ret = ohci_suspend(hcd, do_wakeup);
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if (ret)
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return ret;
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omap_ohci_clock_power(priv, 0);
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return ret;
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}
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static int ohci_omap_resume(struct platform_device *dev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(dev);
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struct ohci_hcd *ohci = hcd_to_ohci(hcd);
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struct ohci_omap_priv *priv = hcd_to_ohci_omap_priv(hcd);
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if (time_before(jiffies, ohci->next_statechange))
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msleep(5);
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ohci->next_statechange = jiffies;
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omap_ohci_clock_power(priv, 1);
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ohci_resume(hcd, false);
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return 0;
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}
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#endif
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/*-------------------------------------------------------------------------*/
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/*
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* Driver definition to register with the OMAP bus
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*/
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static struct platform_driver ohci_hcd_omap_driver = {
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.probe = ohci_hcd_omap_probe,
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.remove = ohci_hcd_omap_remove,
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.shutdown = usb_hcd_platform_shutdown,
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#ifdef CONFIG_PM
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.suspend = ohci_omap_suspend,
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.resume = ohci_omap_resume,
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#endif
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.driver = {
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.name = "ohci",
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},
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};
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static const struct ohci_driver_overrides omap_overrides __initconst = {
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.product_desc = "OMAP OHCI",
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.reset = ohci_omap_reset,
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.extra_priv_size = sizeof(struct ohci_omap_priv),
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};
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static int __init ohci_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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ohci_init_driver(&ohci_omap_hc_driver, &omap_overrides);
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return platform_driver_register(&ohci_hcd_omap_driver);
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}
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module_init(ohci_omap_init);
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static void __exit ohci_omap_cleanup(void)
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{
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platform_driver_unregister(&ohci_hcd_omap_driver);
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}
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module_exit(ohci_omap_cleanup);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_ALIAS("platform:ohci");
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MODULE_LICENSE("GPL");
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