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path: root/drivers/usb/host/ohci-at91.c
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Diffstat (limited to 'drivers/usb/host/ohci-at91.c')
-rw-r--r--drivers/usb/host/ohci-at91.c717
1 files changed, 717 insertions, 0 deletions
diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
new file mode 100644
index 00000000..55d3d641
--- /dev/null
+++ b/drivers/usb/host/ohci-at91.c
@@ -0,0 +1,717 @@
+/*
+ * OHCI HCD (Host Controller Driver) for USB.
+ *
+ * Copyright (C) 2004 SAN People (Pty) Ltd.
+ * Copyright (C) 2005 Thibaut VARENE <varenet@parisc-linux.org>
+ *
+ * AT91 Bus Glue
+ *
+ * Based on fragments of 2.4 driver by Rick Bronson.
+ * Based on ohci-omap.c
+ *
+ * This file is licenced under the GPL.
+ */
+
+#include <linux/clk.h>
+#include <linux/platform_device.h>
+#include <linux/of_platform.h>
+#include <linux/of_gpio.h>
+
+#include <mach/hardware.h>
+#include <asm/gpio.h>
+
+#include <mach/board.h>
+#include <mach/cpu.h>
+
+#ifndef CONFIG_ARCH_AT91
+#error "CONFIG_ARCH_AT91 must be defined."
+#endif
+
+#define valid_port(index) ((index) >= 0 && (index) < AT91_MAX_USBH_PORTS)
+#define at91_for_each_port(index) \
+ for ((index) = 0; (index) < AT91_MAX_USBH_PORTS; (index)++)
+
+/* interface and function clocks; sometimes also an AHB clock */
+static struct clk *iclk, *fclk, *hclk;
+static int clocked;
+
+extern int usb_disabled(void);
+
+/*-------------------------------------------------------------------------*/
+
+static void at91_start_clock(void)
+{
+ clk_enable(hclk);
+ clk_enable(iclk);
+ clk_enable(fclk);
+ clocked = 1;
+}
+
+static void at91_stop_clock(void)
+{
+ clk_disable(fclk);
+ clk_disable(iclk);
+ clk_disable(hclk);
+ clocked = 0;
+}
+
+static void at91_start_hc(struct platform_device *pdev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+ struct ohci_regs __iomem *regs = hcd->regs;
+
+ dev_dbg(&pdev->dev, "start\n");
+
+ /*
+ * Start the USB clocks.
+ */
+ at91_start_clock();
+
+ /*
+ * The USB host controller must remain in reset.
+ */
+ writel(0, &regs->control);
+}
+
+static void at91_stop_hc(struct platform_device *pdev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+ struct ohci_regs __iomem *regs = hcd->regs;
+
+ dev_dbg(&pdev->dev, "stop\n");
+
+ /*
+ * Put the USB host controller into reset.
+ */
+ writel(0, &regs->control);
+
+ /*
+ * Stop the USB clocks.
+ */
+ at91_stop_clock();
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+static void __devexit usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *);
+
+/* configure so an HC device and id are always provided */
+/* always called with process context; sleeping is OK */
+
+
+/**
+ * usb_hcd_at91_probe - initialize AT91-based HCDs
+ * Context: !in_interrupt()
+ *
+ * Allocates basic resources for this USB host controller, and
+ * then invokes the start() method for the HCD associated with it
+ * through the hotplug entry's driver_data.
+ */
+static int __devinit usb_hcd_at91_probe(const struct hc_driver *driver,
+ struct platform_device *pdev)
+{
+ int retval;
+ struct usb_hcd *hcd = NULL;
+
+ if (pdev->num_resources != 2) {
+ pr_debug("hcd probe: invalid num_resources");
+ return -ENODEV;
+ }
+
+ if ((pdev->resource[0].flags != IORESOURCE_MEM)
+ || (pdev->resource[1].flags != IORESOURCE_IRQ)) {
+ pr_debug("hcd probe: invalid resource type\n");
+ return -ENODEV;
+ }
+
+ hcd = usb_create_hcd(driver, &pdev->dev, "at91");
+ if (!hcd)
+ return -ENOMEM;
+ hcd->rsrc_start = pdev->resource[0].start;
+ hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
+
+ if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
+ pr_debug("request_mem_region failed\n");
+ retval = -EBUSY;
+ goto err1;
+ }
+
+ hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
+ if (!hcd->regs) {
+ pr_debug("ioremap failed\n");
+ retval = -EIO;
+ goto err2;
+ }
+
+ iclk = clk_get(&pdev->dev, "ohci_clk");
+ if (IS_ERR(iclk)) {
+ dev_err(&pdev->dev, "failed to get ohci_clk\n");
+ retval = PTR_ERR(iclk);
+ goto err3;
+ }
+ fclk = clk_get(&pdev->dev, "uhpck");
+ if (IS_ERR(fclk)) {
+ dev_err(&pdev->dev, "failed to get uhpck\n");
+ retval = PTR_ERR(fclk);
+ goto err4;
+ }
+ hclk = clk_get(&pdev->dev, "hclk");
+ if (IS_ERR(hclk)) {
+ dev_err(&pdev->dev, "failed to get hclk\n");
+ retval = PTR_ERR(hclk);
+ goto err5;
+ }
+
+ at91_start_hc(pdev);
+ ohci_hcd_init(hcd_to_ohci(hcd));
+
+ retval = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_SHARED);
+ if (retval == 0)
+ return retval;
+
+ /* Error handling */
+ at91_stop_hc(pdev);
+
+ clk_put(hclk);
+ err5:
+ clk_put(fclk);
+ err4:
+ clk_put(iclk);
+
+ err3:
+ iounmap(hcd->regs);
+
+ err2:
+ release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+
+ err1:
+ usb_put_hcd(hcd);
+ return retval;
+}
+
+
+/* may be called with controller, bus, and devices active */
+
+/**
+ * usb_hcd_at91_remove - shutdown processing for AT91-based HCDs
+ * @dev: USB Host Controller being removed
+ * Context: !in_interrupt()
+ *
+ * Reverses the effect of usb_hcd_at91_probe(), first invoking
+ * the HCD's stop() method. It is always called from a thread
+ * context, "rmmod" or something similar.
+ *
+ */
+static void __devexit usb_hcd_at91_remove(struct usb_hcd *hcd,
+ struct platform_device *pdev)
+{
+ usb_remove_hcd(hcd);
+ at91_stop_hc(pdev);
+ iounmap(hcd->regs);
+ release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+ usb_put_hcd(hcd);
+
+ clk_put(hclk);
+ clk_put(fclk);
+ clk_put(iclk);
+ fclk = iclk = hclk = NULL;
+
+ dev_set_drvdata(&pdev->dev, NULL);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int __devinit
+ohci_at91_reset (struct usb_hcd *hcd)
+{
+ struct at91_usbh_data *board = hcd->self.controller->platform_data;
+ struct ohci_hcd *ohci = hcd_to_ohci (hcd);
+ int ret;
+
+ if ((ret = ohci_init(ohci)) < 0)
+ return ret;
+
+ ohci->num_ports = board->ports;
+ return 0;
+}
+
+static int __devinit
+ohci_at91_start (struct usb_hcd *hcd)
+{
+ struct ohci_hcd *ohci = hcd_to_ohci (hcd);
+ int ret;
+
+ if ((ret = ohci_run(ohci)) < 0) {
+ err("can't start %s", hcd->self.bus_name);
+ ohci_stop(hcd);
+ return ret;
+ }
+ return 0;
+}
+
+static void ohci_at91_usb_set_power(struct at91_usbh_data *pdata, int port, int enable)
+{
+ if (!valid_port(port))
+ return;
+
+ if (!gpio_is_valid(pdata->vbus_pin[port]))
+ return;
+
+ gpio_set_value(pdata->vbus_pin[port],
+ pdata->vbus_pin_active_low[port] ^ enable);
+}
+
+static int ohci_at91_usb_get_power(struct at91_usbh_data *pdata, int port)
+{
+ if (!valid_port(port))
+ return -EINVAL;
+
+ if (!gpio_is_valid(pdata->vbus_pin[port]))
+ return -EINVAL;
+
+ return gpio_get_value(pdata->vbus_pin[port]) ^
+ pdata->vbus_pin_active_low[port];
+}
+
+/*
+ * Update the status data from the hub with the over-current indicator change.
+ */
+static int ohci_at91_hub_status_data(struct usb_hcd *hcd, char *buf)
+{
+ struct at91_usbh_data *pdata = hcd->self.controller->platform_data;
+ int length = ohci_hub_status_data(hcd, buf);
+ int port;
+
+ at91_for_each_port(port) {
+ if (pdata->overcurrent_changed[port]) {
+ if (!length)
+ length = 1;
+ buf[0] |= 1 << (port + 1);
+ }
+ }
+
+ return length;
+}
+
+/*
+ * Look at the control requests to the root hub and see if we need to override.
+ */
+static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
+ u16 wIndex, char *buf, u16 wLength)
+{
+ struct at91_usbh_data *pdata = hcd->self.controller->platform_data;
+ struct usb_hub_descriptor *desc;
+ int ret = -EINVAL;
+ u32 *data = (u32 *)buf;
+
+ dev_dbg(hcd->self.controller,
+ "ohci_at91_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n",
+ hcd, typeReq, wValue, wIndex, buf, wLength);
+
+ wIndex--;
+
+ switch (typeReq) {
+ case SetPortFeature:
+ if (wValue == USB_PORT_FEAT_POWER) {
+ dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
+ if (valid_port(wIndex)) {
+ ohci_at91_usb_set_power(pdata, wIndex, 1);
+ ret = 0;
+ }
+
+ goto out;
+ }
+ break;
+
+ case ClearPortFeature:
+ switch (wValue) {
+ case USB_PORT_FEAT_C_OVER_CURRENT:
+ dev_dbg(hcd->self.controller,
+ "ClearPortFeature: C_OVER_CURRENT\n");
+
+ if (valid_port(wIndex)) {
+ pdata->overcurrent_changed[wIndex] = 0;
+ pdata->overcurrent_status[wIndex] = 0;
+ }
+
+ goto out;
+
+ case USB_PORT_FEAT_OVER_CURRENT:
+ dev_dbg(hcd->self.controller,
+ "ClearPortFeature: OVER_CURRENT\n");
+
+ if (valid_port(wIndex))
+ pdata->overcurrent_status[wIndex] = 0;
+
+ goto out;
+
+ case USB_PORT_FEAT_POWER:
+ dev_dbg(hcd->self.controller,
+ "ClearPortFeature: POWER\n");
+
+ if (valid_port(wIndex)) {
+ ohci_at91_usb_set_power(pdata, wIndex, 0);
+ return 0;
+ }
+ }
+ break;
+ }
+
+ ret = ohci_hub_control(hcd, typeReq, wValue, wIndex + 1, buf, wLength);
+ if (ret)
+ goto out;
+
+ switch (typeReq) {
+ case GetHubDescriptor:
+
+ /* update the hub's descriptor */
+
+ desc = (struct usb_hub_descriptor *)buf;
+
+ dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n",
+ desc->wHubCharacteristics);
+
+ /* remove the old configurations for power-switching, and
+ * over-current protection, and insert our new configuration
+ */
+
+ desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM);
+ desc->wHubCharacteristics |= cpu_to_le16(0x0001);
+
+ if (pdata->overcurrent_supported) {
+ desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_OCPM);
+ desc->wHubCharacteristics |= cpu_to_le16(0x0008|0x0001);
+ }
+
+ dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n",
+ desc->wHubCharacteristics);
+
+ return ret;
+
+ case GetPortStatus:
+ /* check port status */
+
+ dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);
+
+ if (valid_port(wIndex)) {
+ if (!ohci_at91_usb_get_power(pdata, wIndex))
+ *data &= ~cpu_to_le32(RH_PS_PPS);
+
+ if (pdata->overcurrent_changed[wIndex])
+ *data |= cpu_to_le32(RH_PS_OCIC);
+
+ if (pdata->overcurrent_status[wIndex])
+ *data |= cpu_to_le32(RH_PS_POCI);
+ }
+ }
+
+ out:
+ return ret;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static const struct hc_driver ohci_at91_hc_driver = {
+ .description = hcd_name,
+ .product_desc = "AT91 OHCI",
+ .hcd_priv_size = sizeof(struct ohci_hcd),
+
+ /*
+ * generic hardware linkage
+ */
+ .irq = ohci_irq,
+ .flags = HCD_USB11 | HCD_MEMORY,
+
+ /*
+ * basic lifecycle operations
+ */
+ .reset = ohci_at91_reset,
+ .start = ohci_at91_start,
+ .stop = ohci_stop,
+ .shutdown = ohci_shutdown,
+
+ /*
+ * managing i/o requests and associated device resources
+ */
+ .urb_enqueue = ohci_urb_enqueue,
+ .urb_dequeue = ohci_urb_dequeue,
+ .endpoint_disable = ohci_endpoint_disable,
+
+ /*
+ * scheduling support
+ */
+ .get_frame_number = ohci_get_frame,
+
+ /*
+ * root hub support
+ */
+ .hub_status_data = ohci_at91_hub_status_data,
+ .hub_control = ohci_at91_hub_control,
+#ifdef CONFIG_PM
+ .bus_suspend = ohci_bus_suspend,
+ .bus_resume = ohci_bus_resume,
+#endif
+ .start_port_reset = ohci_start_port_reset,
+};
+
+/*-------------------------------------------------------------------------*/
+
+static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data)
+{
+ struct platform_device *pdev = data;
+ struct at91_usbh_data *pdata = pdev->dev.platform_data;
+ int val, gpio, port;
+
+ /* From the GPIO notifying the over-current situation, find
+ * out the corresponding port */
+ at91_for_each_port(port) {
+ if (gpio_to_irq(pdata->overcurrent_pin[port]) == irq) {
+ gpio = pdata->overcurrent_pin[port];
+ break;
+ }
+ }
+
+ if (port == AT91_MAX_USBH_PORTS) {
+ dev_err(& pdev->dev, "overcurrent interrupt from unknown GPIO\n");
+ return IRQ_HANDLED;
+ }
+
+ val = gpio_get_value(gpio);
+
+ /* When notified of an over-current situation, disable power
+ 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;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id at91_ohci_dt_ids[] = {
+ { .compatible = "atmel,at91rm9200-ohci" },
+ { /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, at91_ohci_dt_ids);
+
+static u64 at91_ohci_dma_mask = DMA_BIT_MASK(32);
+
+static int __devinit ohci_at91_of_init(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ int i, gpio;
+ enum of_gpio_flags flags;
+ struct at91_usbh_data *pdata;
+ u32 ports;
+
+ if (!np)
+ return 0;
+
+ /* 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.
+ */
+ if (!pdev->dev.dma_mask)
+ pdev->dev.dma_mask = &at91_ohci_dma_mask;
+
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ if (!of_property_read_u32(np, "num-ports", &ports))
+ pdata->ports = ports;
+
+ at91_for_each_port(i) {
+ gpio = of_get_named_gpio_flags(np, "atmel,vbus-gpio", i, &flags);
+ pdata->vbus_pin[i] = gpio;
+ if (!gpio_is_valid(gpio))
+ continue;
+ pdata->vbus_pin_active_low[i] = flags & OF_GPIO_ACTIVE_LOW;
+ }
+
+ at91_for_each_port(i)
+ pdata->overcurrent_pin[i] =
+ of_get_named_gpio_flags(np, "atmel,oc-gpio", i, &flags);
+
+ pdev->dev.platform_data = pdata;
+
+ return 0;
+}
+#else
+static int __devinit ohci_at91_of_init(struct platform_device *pdev)
+{
+ return 0;
+}
+#endif
+
+/*-------------------------------------------------------------------------*/
+
+static int __devinit ohci_hcd_at91_drv_probe(struct platform_device *pdev)
+{
+ struct at91_usbh_data *pdata;
+ int i;
+ int gpio;
+ int ret;
+
+ ret = ohci_at91_of_init(pdev);
+ if (ret)
+ return ret;
+
+ pdata = pdev->dev.platform_data;
+
+ if (pdata) {
+ at91_for_each_port(i) {
+ if (!gpio_is_valid(pdata->vbus_pin[i]))
+ continue;
+ gpio = pdata->vbus_pin[i];
+
+ ret = gpio_request(gpio, "ohci_vbus");
+ if (ret) {
+ dev_err(&pdev->dev,
+ "can't request vbus gpio %d\n", gpio);
+ continue;
+ }
+ ret = gpio_direction_output(gpio,
+ !pdata->vbus_pin_active_low[i]);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "can't put vbus gpio %d as output %d\n",
+ gpio, !pdata->vbus_pin_active_low[i]);
+ gpio_free(gpio);
+ continue;
+ }
+
+ ohci_at91_usb_set_power(pdata, i, 1);
+ }
+
+ at91_for_each_port(i) {
+ if (!gpio_is_valid(pdata->overcurrent_pin[i]))
+ continue;
+ gpio = pdata->overcurrent_pin[i];
+
+ ret = gpio_request(gpio, "ohci_overcurrent");
+ if (ret) {
+ dev_err(&pdev->dev,
+ "can't request overcurrent gpio %d\n",
+ gpio);
+ continue;
+ }
+
+ ret = gpio_direction_input(gpio);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "can't configure overcurrent gpio %d as input\n",
+ gpio);
+ gpio_free(gpio);
+ continue;
+ }
+
+ ret = request_irq(gpio_to_irq(gpio),
+ ohci_hcd_at91_overcurrent_irq,
+ IRQF_SHARED, "ohci_overcurrent", pdev);
+ if (ret) {
+ gpio_free(gpio);
+ dev_err(&pdev->dev,
+ "can't get gpio IRQ for overcurrent\n");
+ }
+ }
+ }
+
+ device_init_wakeup(&pdev->dev, 1);
+ return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
+}
+
+static int __devexit ohci_hcd_at91_drv_remove(struct platform_device *pdev)
+{
+ struct at91_usbh_data *pdata = pdev->dev.platform_data;
+ int i;
+
+ if (pdata) {
+ at91_for_each_port(i) {
+ if (!gpio_is_valid(pdata->vbus_pin[i]))
+ continue;
+ ohci_at91_usb_set_power(pdata, i, 0);
+ gpio_free(pdata->vbus_pin[i]);
+ }
+
+ at91_for_each_port(i) {
+ if (!gpio_is_valid(pdata->overcurrent_pin[i]))
+ continue;
+ free_irq(gpio_to_irq(pdata->overcurrent_pin[i]), pdev);
+ gpio_free(pdata->overcurrent_pin[i]);
+ }
+ }
+
+ device_init_wakeup(&pdev->dev, 0);
+ usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
+ return 0;
+}
+
+#ifdef CONFIG_PM
+
+static int
+ohci_hcd_at91_drv_suspend(struct platform_device *pdev, pm_message_t mesg)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+ struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+
+ if (device_may_wakeup(&pdev->dev))
+ enable_irq_wake(hcd->irq);
+
+ /*
+ * 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 (at91_suspend_entering_slow_clock()) {
+ ohci_usb_reset (ohci);
+ /* flush the writes */
+ (void) ohci_readl (ohci, &ohci->regs->control);
+ at91_stop_clock();
+ }
+
+ return 0;
+}
+
+static int ohci_hcd_at91_drv_resume(struct platform_device *pdev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+
+ if (device_may_wakeup(&pdev->dev))
+ disable_irq_wake(hcd->irq);
+
+ if (!clocked)
+ at91_start_clock();
+
+ ohci_finish_controller_resume(hcd);
+ return 0;
+}
+#else
+#define ohci_hcd_at91_drv_suspend NULL
+#define ohci_hcd_at91_drv_resume NULL
+#endif
+
+MODULE_ALIAS("platform:at91_ohci");
+
+static struct platform_driver ohci_hcd_at91_driver = {
+ .probe = ohci_hcd_at91_drv_probe,
+ .remove = __devexit_p(ohci_hcd_at91_drv_remove),
+ .shutdown = usb_hcd_platform_shutdown,
+ .suspend = ohci_hcd_at91_drv_suspend,
+ .resume = ohci_hcd_at91_drv_resume,
+ .driver = {
+ .name = "at91_ohci",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(at91_ohci_dt_ids),
+ },
+};
generated by cgit (git 2.34.1) at 2025-01-08 02:05:44 +0000