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![Ahmed S. Darwish](/assets/img/avatar_default.png)
The usage of in_interrupt() in drivers is phased out for various reasons. Various comments use !in_interrupt() to describe calling context for probe() and remove() functions. That's wrong because the calling context has to be preemptible task context, which is not what !in_interrupt() describes. Cleanup the comments. While at it add the missing kernel doc argument descriptors. Signed-off-by: Ahmed S. Darwish <a.darwish@linutronix.de> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Krzysztof Kozlowski <krzk@kernel.org> Acked-by: Alan Stern <stern@rowland.harvard.edu> Cc: linux-usb@vger.kernel.org Cc: linux-omap@vger.kernel.org Cc: Kukjin Kim <kgene@kernel.org> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Link: https://lore.kernel.org/r/20201019101110.439968251@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
705 lines
17 KiB
C
705 lines
17 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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* Copyright (C) 2004 SAN People (Pty) Ltd.
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* Copyright (C) 2005 Thibaut VARENE <varenet@parisc-linux.org>
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*
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* AT91 Bus Glue
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*
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* Based on fragments of 2.4 driver by Rick Bronson.
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* Based on ohci-omap.c
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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/gpio/consumer.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/platform_data/atmel.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mfd/syscon.h>
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#include <linux/regmap.h>
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#include <linux/usb.h>
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#include <linux/usb/hcd.h>
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#include <soc/at91/atmel-sfr.h>
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#include "ohci.h"
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#define valid_port(index) ((index) >= 0 && (index) < AT91_MAX_USBH_PORTS)
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#define at91_for_each_port(index) \
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for ((index) = 0; (index) < AT91_MAX_USBH_PORTS; (index)++)
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/* interface, function and usb clocks; sometimes also an AHB clock */
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#define hcd_to_ohci_at91_priv(h) \
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((struct ohci_at91_priv *)hcd_to_ohci(h)->priv)
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#define AT91_MAX_USBH_PORTS 3
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struct at91_usbh_data {
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struct gpio_desc *vbus_pin[AT91_MAX_USBH_PORTS];
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struct gpio_desc *overcurrent_pin[AT91_MAX_USBH_PORTS];
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u8 ports; /* number of ports on root hub */
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u8 overcurrent_supported;
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u8 overcurrent_status[AT91_MAX_USBH_PORTS];
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u8 overcurrent_changed[AT91_MAX_USBH_PORTS];
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};
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struct ohci_at91_priv {
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struct clk *iclk;
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struct clk *fclk;
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struct clk *hclk;
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bool clocked;
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bool wakeup; /* Saved wake-up state for resume */
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struct regmap *sfr_regmap;
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};
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/* interface and function clocks; sometimes also an AHB clock */
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#define DRIVER_DESC "OHCI Atmel driver"
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static const char hcd_name[] = "ohci-atmel";
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static struct hc_driver __read_mostly ohci_at91_hc_driver;
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static const struct ohci_driver_overrides ohci_at91_drv_overrides __initconst = {
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.extra_priv_size = sizeof(struct ohci_at91_priv),
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};
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/*-------------------------------------------------------------------------*/
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static void at91_start_clock(struct ohci_at91_priv *ohci_at91)
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{
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if (ohci_at91->clocked)
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return;
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clk_set_rate(ohci_at91->fclk, 48000000);
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clk_prepare_enable(ohci_at91->hclk);
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clk_prepare_enable(ohci_at91->iclk);
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clk_prepare_enable(ohci_at91->fclk);
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ohci_at91->clocked = true;
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}
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static void at91_stop_clock(struct ohci_at91_priv *ohci_at91)
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{
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if (!ohci_at91->clocked)
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return;
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clk_disable_unprepare(ohci_at91->fclk);
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clk_disable_unprepare(ohci_at91->iclk);
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clk_disable_unprepare(ohci_at91->hclk);
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ohci_at91->clocked = false;
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}
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static void at91_start_hc(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_regs __iomem *regs = hcd->regs;
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struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
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dev_dbg(&pdev->dev, "start\n");
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/*
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* Start the USB clocks.
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*/
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at91_start_clock(ohci_at91);
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/*
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* The USB host controller must remain in reset.
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*/
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writel(0, ®s->control);
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}
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static void at91_stop_hc(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_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
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dev_dbg(&pdev->dev, "stop\n");
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/*
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* Put the USB host controller into reset.
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*/
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usb_hcd_platform_shutdown(pdev);
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/*
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* Stop the USB clocks.
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*/
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at91_stop_clock(ohci_at91);
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}
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/*-------------------------------------------------------------------------*/
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static void usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *);
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static struct regmap *at91_dt_syscon_sfr(void)
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{
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struct regmap *regmap;
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regmap = syscon_regmap_lookup_by_compatible("atmel,sama5d2-sfr");
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if (IS_ERR(regmap)) {
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regmap = syscon_regmap_lookup_by_compatible("microchip,sam9x60-sfr");
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if (IS_ERR(regmap))
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regmap = NULL;
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}
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return regmap;
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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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* usb_hcd_at91_probe - initialize AT91-based HCDs
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* @driver: Pointer to hc driver instance
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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 usb_hcd_at91_probe(const struct hc_driver *driver,
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struct platform_device *pdev)
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{
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struct at91_usbh_data *board;
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struct ohci_hcd *ohci;
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int retval;
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struct usb_hcd *hcd;
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struct ohci_at91_priv *ohci_at91;
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struct device *dev = &pdev->dev;
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struct resource *res;
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int irq;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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dev_dbg(dev, "hcd probe: missing irq resource\n");
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return irq;
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}
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hcd = usb_create_hcd(driver, dev, "at91");
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if (!hcd)
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return -ENOMEM;
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ohci_at91 = hcd_to_ohci_at91_priv(hcd);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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hcd->regs = devm_ioremap_resource(dev, res);
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if (IS_ERR(hcd->regs)) {
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retval = PTR_ERR(hcd->regs);
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goto err;
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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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ohci_at91->iclk = devm_clk_get(dev, "ohci_clk");
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if (IS_ERR(ohci_at91->iclk)) {
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dev_err(dev, "failed to get ohci_clk\n");
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retval = PTR_ERR(ohci_at91->iclk);
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goto err;
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}
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ohci_at91->fclk = devm_clk_get(dev, "uhpck");
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if (IS_ERR(ohci_at91->fclk)) {
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dev_err(dev, "failed to get uhpck\n");
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retval = PTR_ERR(ohci_at91->fclk);
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goto err;
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}
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ohci_at91->hclk = devm_clk_get(dev, "hclk");
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if (IS_ERR(ohci_at91->hclk)) {
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dev_err(dev, "failed to get hclk\n");
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retval = PTR_ERR(ohci_at91->hclk);
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goto err;
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}
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ohci_at91->sfr_regmap = at91_dt_syscon_sfr();
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if (!ohci_at91->sfr_regmap)
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dev_dbg(dev, "failed to find sfr node\n");
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board = hcd->self.controller->platform_data;
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ohci = hcd_to_ohci(hcd);
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ohci->num_ports = board->ports;
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at91_start_hc(pdev);
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/*
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* The RemoteWakeupConnected bit has to be set explicitly
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* before calling ohci_run. The reset value of this bit is 0.
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*/
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ohci->hc_control = OHCI_CTRL_RWC;
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retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
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if (retval == 0) {
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device_wakeup_enable(hcd->self.controller);
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return retval;
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}
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/* Error handling */
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at91_stop_hc(pdev);
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err:
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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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* usb_hcd_at91_remove - shutdown processing for AT91-based HCDs
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* @hcd: USB controller to remove
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* @pdev: Platform device required for cleanup
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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 usb_hcd_at91_probe(), first invoking
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* the HCD's stop() method. It is always called from a thread
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* context, "rmmod" or something similar.
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*/
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static void usb_hcd_at91_remove(struct usb_hcd *hcd,
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struct platform_device *pdev)
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{
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usb_remove_hcd(hcd);
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at91_stop_hc(pdev);
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usb_put_hcd(hcd);
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}
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/*-------------------------------------------------------------------------*/
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static void ohci_at91_usb_set_power(struct at91_usbh_data *pdata, int port, int enable)
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{
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if (!valid_port(port))
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return;
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gpiod_set_value(pdata->vbus_pin[port], enable);
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}
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static int ohci_at91_usb_get_power(struct at91_usbh_data *pdata, int port)
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{
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if (!valid_port(port))
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return -EINVAL;
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return gpiod_get_value(pdata->vbus_pin[port]);
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}
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/*
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* Update the status data from the hub with the over-current indicator change.
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*/
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static int ohci_at91_hub_status_data(struct usb_hcd *hcd, char *buf)
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{
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struct at91_usbh_data *pdata = hcd->self.controller->platform_data;
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int length = ohci_hub_status_data(hcd, buf);
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int port;
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at91_for_each_port(port) {
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if (pdata->overcurrent_changed[port]) {
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if (!length)
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length = 1;
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buf[0] |= 1 << (port + 1);
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}
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}
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return length;
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}
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static int ohci_at91_port_suspend(struct regmap *regmap, u8 set)
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{
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u32 regval;
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int ret;
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if (!regmap)
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return 0;
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ret = regmap_read(regmap, AT91_SFR_OHCIICR, ®val);
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if (ret)
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return ret;
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if (set)
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regval |= AT91_OHCIICR_USB_SUSPEND;
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else
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regval &= ~AT91_OHCIICR_USB_SUSPEND;
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regmap_write(regmap, AT91_SFR_OHCIICR, regval);
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return 0;
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}
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/*
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* Look at the control requests to the root hub and see if we need to override.
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*/
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static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
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u16 wIndex, char *buf, u16 wLength)
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{
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struct at91_usbh_data *pdata = dev_get_platdata(hcd->self.controller);
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struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
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struct usb_hub_descriptor *desc;
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int ret = -EINVAL;
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u32 *data = (u32 *)buf;
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dev_dbg(hcd->self.controller,
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"ohci_at91_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n",
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hcd, typeReq, wValue, wIndex, buf, wLength);
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wIndex--;
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switch (typeReq) {
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case SetPortFeature:
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switch (wValue) {
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case USB_PORT_FEAT_POWER:
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dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
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if (valid_port(wIndex)) {
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ohci_at91_usb_set_power(pdata, wIndex, 1);
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ret = 0;
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}
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goto out;
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case USB_PORT_FEAT_SUSPEND:
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dev_dbg(hcd->self.controller, "SetPortFeat: SUSPEND\n");
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if (valid_port(wIndex) && ohci_at91->sfr_regmap) {
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ohci_at91_port_suspend(ohci_at91->sfr_regmap,
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1);
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return 0;
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}
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break;
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}
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break;
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case ClearPortFeature:
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switch (wValue) {
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case USB_PORT_FEAT_C_OVER_CURRENT:
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dev_dbg(hcd->self.controller,
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"ClearPortFeature: C_OVER_CURRENT\n");
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if (valid_port(wIndex)) {
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pdata->overcurrent_changed[wIndex] = 0;
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pdata->overcurrent_status[wIndex] = 0;
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}
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goto out;
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case USB_PORT_FEAT_OVER_CURRENT:
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dev_dbg(hcd->self.controller,
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"ClearPortFeature: OVER_CURRENT\n");
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if (valid_port(wIndex))
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pdata->overcurrent_status[wIndex] = 0;
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goto out;
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case USB_PORT_FEAT_POWER:
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dev_dbg(hcd->self.controller,
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"ClearPortFeature: POWER\n");
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if (valid_port(wIndex)) {
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ohci_at91_usb_set_power(pdata, wIndex, 0);
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return 0;
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}
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break;
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case USB_PORT_FEAT_SUSPEND:
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dev_dbg(hcd->self.controller, "ClearPortFeature: SUSPEND\n");
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if (valid_port(wIndex) && ohci_at91->sfr_regmap) {
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ohci_at91_port_suspend(ohci_at91->sfr_regmap,
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0);
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return 0;
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}
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break;
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}
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break;
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}
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ret = ohci_hub_control(hcd, typeReq, wValue, wIndex + 1, buf, wLength);
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if (ret)
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goto out;
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switch (typeReq) {
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case GetHubDescriptor:
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/* update the hub's descriptor */
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desc = (struct usb_hub_descriptor *)buf;
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dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n",
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desc->wHubCharacteristics);
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/* remove the old configurations for power-switching, and
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* over-current protection, and insert our new configuration
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*/
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desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM);
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desc->wHubCharacteristics |=
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cpu_to_le16(HUB_CHAR_INDV_PORT_LPSM);
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if (pdata->overcurrent_supported) {
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desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_OCPM);
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desc->wHubCharacteristics |=
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cpu_to_le16(HUB_CHAR_INDV_PORT_OCPM);
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}
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dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n",
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desc->wHubCharacteristics);
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return ret;
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case GetPortStatus:
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/* check port status */
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dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);
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if (valid_port(wIndex)) {
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if (!ohci_at91_usb_get_power(pdata, wIndex))
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*data &= ~cpu_to_le32(RH_PS_PPS);
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if (pdata->overcurrent_changed[wIndex])
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*data |= cpu_to_le32(RH_PS_OCIC);
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if (pdata->overcurrent_status[wIndex])
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*data |= cpu_to_le32(RH_PS_POCI);
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}
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}
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out:
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return ret;
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}
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/*-------------------------------------------------------------------------*/
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static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data)
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{
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struct platform_device *pdev = data;
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struct at91_usbh_data *pdata = dev_get_platdata(&pdev->dev);
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int val, port;
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/* From the GPIO notifying the over-current situation, find
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* out the corresponding port */
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at91_for_each_port(port) {
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if (gpiod_to_irq(pdata->overcurrent_pin[port]) == irq)
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break;
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}
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if (port == AT91_MAX_USBH_PORTS) {
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dev_err(& pdev->dev, "overcurrent interrupt from unknown GPIO\n");
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return IRQ_HANDLED;
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}
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val = gpiod_get_value(pdata->overcurrent_pin[port]);
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/* When notified of an over-current situation, disable power
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on the corresponding port, and mark this port in
|
|
over-current. */
|
|
if (!val) {
|
|
ohci_at91_usb_set_power(pdata, port, 0);
|
|
pdata->overcurrent_status[port] = 1;
|
|
pdata->overcurrent_changed[port] = 1;
|
|
}
|
|
|
|
dev_dbg(& pdev->dev, "overcurrent situation %s\n",
|
|
val ? "exited" : "notified");
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static const struct of_device_id at91_ohci_dt_ids[] = {
|
|
{ .compatible = "atmel,at91rm9200-ohci" },
|
|
{ /* sentinel */ }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, at91_ohci_dt_ids);
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
|
|
{
|
|
struct device_node *np = pdev->dev.of_node;
|
|
struct at91_usbh_data *pdata;
|
|
int i;
|
|
int ret;
|
|
int err;
|
|
u32 ports;
|
|
|
|
/* Right now device-tree probed devices don't get dma_mask set.
|
|
* Since shared usb code relies on it, set it here for now.
|
|
* Once we have dma capability bindings this can go away.
|
|
*/
|
|
ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
|
|
if (ret)
|
|
return ret;
|
|
|
|
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
|
|
if (!pdata)
|
|
return -ENOMEM;
|
|
|
|
pdev->dev.platform_data = pdata;
|
|
|
|
if (!of_property_read_u32(np, "num-ports", &ports))
|
|
pdata->ports = ports;
|
|
|
|
at91_for_each_port(i) {
|
|
if (i >= pdata->ports)
|
|
break;
|
|
|
|
pdata->vbus_pin[i] =
|
|
devm_gpiod_get_index_optional(&pdev->dev, "atmel,vbus",
|
|
i, GPIOD_OUT_HIGH);
|
|
if (IS_ERR(pdata->vbus_pin[i])) {
|
|
err = PTR_ERR(pdata->vbus_pin[i]);
|
|
dev_err(&pdev->dev, "unable to claim gpio \"vbus\": %d\n", err);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
at91_for_each_port(i) {
|
|
if (i >= pdata->ports)
|
|
break;
|
|
|
|
pdata->overcurrent_pin[i] =
|
|
devm_gpiod_get_index_optional(&pdev->dev, "atmel,oc",
|
|
i, GPIOD_IN);
|
|
if (!pdata->overcurrent_pin[i])
|
|
continue;
|
|
if (IS_ERR(pdata->overcurrent_pin[i])) {
|
|
err = PTR_ERR(pdata->overcurrent_pin[i]);
|
|
dev_err(&pdev->dev, "unable to claim gpio \"overcurrent\": %d\n", err);
|
|
continue;
|
|
}
|
|
|
|
ret = devm_request_irq(&pdev->dev,
|
|
gpiod_to_irq(pdata->overcurrent_pin[i]),
|
|
ohci_hcd_at91_overcurrent_irq,
|
|
IRQF_SHARED,
|
|
"ohci_overcurrent", pdev);
|
|
if (ret)
|
|
dev_info(&pdev->dev, "failed to request gpio \"overcurrent\" IRQ\n");
|
|
}
|
|
|
|
device_init_wakeup(&pdev->dev, 1);
|
|
return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
|
|
}
|
|
|
|
static int ohci_hcd_at91_drv_remove(struct platform_device *pdev)
|
|
{
|
|
struct at91_usbh_data *pdata = dev_get_platdata(&pdev->dev);
|
|
int i;
|
|
|
|
if (pdata) {
|
|
at91_for_each_port(i)
|
|
ohci_at91_usb_set_power(pdata, i, 0);
|
|
}
|
|
|
|
device_init_wakeup(&pdev->dev, 0);
|
|
usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused
|
|
ohci_hcd_at91_drv_suspend(struct device *dev)
|
|
{
|
|
struct usb_hcd *hcd = dev_get_drvdata(dev);
|
|
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
|
|
struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
|
|
int ret;
|
|
|
|
/*
|
|
* Disable wakeup if we are going to sleep with slow clock mode
|
|
* enabled.
|
|
*/
|
|
ohci_at91->wakeup = device_may_wakeup(dev)
|
|
&& !at91_suspend_entering_slow_clock();
|
|
|
|
if (ohci_at91->wakeup)
|
|
enable_irq_wake(hcd->irq);
|
|
|
|
ohci_at91_port_suspend(ohci_at91->sfr_regmap, 1);
|
|
|
|
ret = ohci_suspend(hcd, ohci_at91->wakeup);
|
|
if (ret) {
|
|
if (ohci_at91->wakeup)
|
|
disable_irq_wake(hcd->irq);
|
|
return ret;
|
|
}
|
|
/*
|
|
* The integrated transceivers seem unable to notice disconnect,
|
|
* reconnect, or wakeup without the 48 MHz clock active. so for
|
|
* correctness, always discard connection state (using reset).
|
|
*
|
|
* REVISIT: some boards will be able to turn VBUS off...
|
|
*/
|
|
if (!ohci_at91->wakeup) {
|
|
ohci->rh_state = OHCI_RH_HALTED;
|
|
|
|
/* flush the writes */
|
|
(void) ohci_readl (ohci, &ohci->regs->control);
|
|
msleep(1);
|
|
at91_stop_clock(ohci_at91);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __maybe_unused
|
|
ohci_hcd_at91_drv_resume(struct device *dev)
|
|
{
|
|
struct usb_hcd *hcd = dev_get_drvdata(dev);
|
|
struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
|
|
|
|
if (ohci_at91->wakeup)
|
|
disable_irq_wake(hcd->irq);
|
|
else
|
|
at91_start_clock(ohci_at91);
|
|
|
|
ohci_resume(hcd, false);
|
|
|
|
ohci_at91_port_suspend(ohci_at91->sfr_regmap, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(ohci_hcd_at91_pm_ops, ohci_hcd_at91_drv_suspend,
|
|
ohci_hcd_at91_drv_resume);
|
|
|
|
static struct platform_driver ohci_hcd_at91_driver = {
|
|
.probe = ohci_hcd_at91_drv_probe,
|
|
.remove = ohci_hcd_at91_drv_remove,
|
|
.shutdown = usb_hcd_platform_shutdown,
|
|
.driver = {
|
|
.name = "at91_ohci",
|
|
.pm = &ohci_hcd_at91_pm_ops,
|
|
.of_match_table = at91_ohci_dt_ids,
|
|
},
|
|
};
|
|
|
|
static int __init ohci_at91_init(void)
|
|
{
|
|
if (usb_disabled())
|
|
return -ENODEV;
|
|
|
|
pr_info("%s: " DRIVER_DESC "\n", hcd_name);
|
|
ohci_init_driver(&ohci_at91_hc_driver, &ohci_at91_drv_overrides);
|
|
|
|
/*
|
|
* The Atmel HW has some unusual quirks, which require Atmel-specific
|
|
* workarounds. We override certain hc_driver functions here to
|
|
* achieve that. We explicitly do not enhance ohci_driver_overrides to
|
|
* allow this more easily, since this is an unusual case, and we don't
|
|
* want to encourage others to override these functions by making it
|
|
* too easy.
|
|
*/
|
|
|
|
ohci_at91_hc_driver.hub_status_data = ohci_at91_hub_status_data;
|
|
ohci_at91_hc_driver.hub_control = ohci_at91_hub_control;
|
|
|
|
return platform_driver_register(&ohci_hcd_at91_driver);
|
|
}
|
|
module_init(ohci_at91_init);
|
|
|
|
static void __exit ohci_at91_cleanup(void)
|
|
{
|
|
platform_driver_unregister(&ohci_hcd_at91_driver);
|
|
}
|
|
module_exit(ohci_at91_cleanup);
|
|
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:at91_ohci");
|