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705 lines
17 KiB
705 lines
17 KiB
// 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 <[email protected]> |
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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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|
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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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|
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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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|
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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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/* |
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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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/* |
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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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|
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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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|
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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 |
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over-current. */ |
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if (!val) { |
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ohci_at91_usb_set_power(pdata, port, 0); |
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pdata->overcurrent_status[port] = 1; |
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pdata->overcurrent_changed[port] = 1; |
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} |
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dev_dbg(& pdev->dev, "overcurrent situation %s\n", |
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val ? "exited" : "notified"); |
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|
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return IRQ_HANDLED; |
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} |
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static const struct of_device_id at91_ohci_dt_ids[] = { |
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{ .compatible = "atmel,at91rm9200-ohci" }, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(of, at91_ohci_dt_ids); |
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|
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/*-------------------------------------------------------------------------*/ |
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|
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static int ohci_hcd_at91_drv_probe(struct platform_device *pdev) |
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{ |
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struct device_node *np = pdev->dev.of_node; |
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struct at91_usbh_data *pdata; |
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int i; |
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int ret; |
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int err; |
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u32 ports; |
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|
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/* Right now device-tree probed devices don't get dma_mask set. |
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* Since shared usb code relies on it, set it here for now. |
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* Once we have dma capability bindings this can go away. |
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*/ |
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ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); |
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if (ret) |
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return ret; |
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); |
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if (!pdata) |
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return -ENOMEM; |
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pdev->dev.platform_data = pdata; |
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|
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if (!of_property_read_u32(np, "num-ports", &ports)) |
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pdata->ports = ports; |
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at91_for_each_port(i) { |
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if (i >= pdata->ports) |
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break; |
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|
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pdata->vbus_pin[i] = |
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devm_gpiod_get_index_optional(&pdev->dev, "atmel,vbus", |
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i, GPIOD_OUT_HIGH); |
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if (IS_ERR(pdata->vbus_pin[i])) { |
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err = PTR_ERR(pdata->vbus_pin[i]); |
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dev_err(&pdev->dev, "unable to claim gpio \"vbus\": %d\n", err); |
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continue; |
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} |
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} |
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at91_for_each_port(i) { |
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if (i >= pdata->ports) |
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break; |
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|
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pdata->overcurrent_pin[i] = |
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devm_gpiod_get_index_optional(&pdev->dev, "atmel,oc", |
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i, GPIOD_IN); |
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if (!pdata->overcurrent_pin[i]) |
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continue; |
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if (IS_ERR(pdata->overcurrent_pin[i])) { |
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err = PTR_ERR(pdata->overcurrent_pin[i]); |
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dev_err(&pdev->dev, "unable to claim gpio \"overcurrent\": %d\n", err); |
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continue; |
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} |
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|
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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");
|
|
|