277 lines
6.1 KiB
C
277 lines
6.1 KiB
C
/*
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* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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#include <linux/regulator/consumer.h>
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struct jz4740_ohci_hcd {
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struct ohci_hcd ohci_hcd;
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struct regulator *vbus;
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bool vbus_enabled;
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struct clk *clk;
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};
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static inline struct jz4740_ohci_hcd *hcd_to_jz4740_hcd(struct usb_hcd *hcd)
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{
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return (struct jz4740_ohci_hcd *)(hcd->hcd_priv);
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}
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static inline struct usb_hcd *jz4740_hcd_to_hcd(struct jz4740_ohci_hcd *jz4740_ohci)
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{
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return container_of((void *)jz4740_ohci, struct usb_hcd, hcd_priv);
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}
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static int ohci_jz4740_start(struct usb_hcd *hcd)
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{
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struct ohci_hcd *ohci = hcd_to_ohci(hcd);
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int ret;
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ret = ohci_init(ohci);
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if (ret < 0)
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return ret;
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ohci->num_ports = 1;
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ret = ohci_run(ohci);
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if (ret < 0) {
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dev_err(hcd->self.controller, "Can not start %s",
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hcd->self.bus_name);
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ohci_stop(hcd);
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return ret;
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}
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return 0;
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}
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static int ohci_jz4740_set_vbus_power(struct jz4740_ohci_hcd *jz4740_ohci,
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bool enabled)
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{
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int ret = 0;
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if (!jz4740_ohci->vbus)
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return 0;
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if (enabled && !jz4740_ohci->vbus_enabled) {
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ret = regulator_enable(jz4740_ohci->vbus);
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if (ret)
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dev_err(jz4740_hcd_to_hcd(jz4740_ohci)->self.controller,
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"Could not power vbus\n");
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} else if (!enabled && jz4740_ohci->vbus_enabled) {
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ret = regulator_disable(jz4740_ohci->vbus);
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}
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if (ret == 0)
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jz4740_ohci->vbus_enabled = enabled;
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return ret;
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}
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static int ohci_jz4740_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 jz4740_ohci_hcd *jz4740_ohci = hcd_to_jz4740_hcd(hcd);
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int ret;
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switch (typeReq) {
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case SetHubFeature:
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if (wValue == USB_PORT_FEAT_POWER)
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ret = ohci_jz4740_set_vbus_power(jz4740_ohci, true);
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break;
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case ClearHubFeature:
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if (wValue == USB_PORT_FEAT_POWER)
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ret = ohci_jz4740_set_vbus_power(jz4740_ohci, false);
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break;
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}
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if (ret)
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return ret;
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return ohci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
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}
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static const struct hc_driver ohci_jz4740_hc_driver = {
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.description = hcd_name,
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.product_desc = "JZ4740 OHCI",
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.hcd_priv_size = sizeof(struct jz4740_ohci_hcd),
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/*
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* generic hardware linkage
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*/
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.irq = ohci_irq,
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.flags = HCD_USB11 | HCD_MEMORY,
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/*
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* basic lifecycle operations
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*/
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.start = ohci_jz4740_start,
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.stop = ohci_stop,
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.shutdown = ohci_shutdown,
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/*
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* managing i/o requests and associated device resources
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*/
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.urb_enqueue = ohci_urb_enqueue,
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.urb_dequeue = ohci_urb_dequeue,
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.endpoint_disable = ohci_endpoint_disable,
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/*
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* scheduling support
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*/
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.get_frame_number = ohci_get_frame,
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/*
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* root hub support
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*/
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.hub_status_data = ohci_hub_status_data,
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.hub_control = ohci_jz4740_hub_control,
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#ifdef CONFIG_PM
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.bus_suspend = ohci_bus_suspend,
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.bus_resume = ohci_bus_resume,
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#endif
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.start_port_reset = ohci_start_port_reset,
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};
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static __devinit int jz4740_ohci_probe(struct platform_device *pdev)
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{
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int ret;
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struct usb_hcd *hcd;
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struct jz4740_ohci_hcd *jz4740_ohci;
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struct resource *res;
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int irq;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(&pdev->dev, "Failed to get platform resource\n");
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return -ENOENT;
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}
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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dev_err(&pdev->dev, "Failed to get platform irq\n");
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return irq;
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}
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hcd = usb_create_hcd(&ohci_jz4740_hc_driver, &pdev->dev, "jz4740");
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if (!hcd) {
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dev_err(&pdev->dev, "Failed to create hcd.\n");
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return -ENOMEM;
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}
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jz4740_ohci = hcd_to_jz4740_hcd(hcd);
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res = request_mem_region(res->start, resource_size(res), hcd_name);
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if (!res) {
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dev_err(&pdev->dev, "Failed to request mem region.\n");
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ret = -EBUSY;
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goto err_free;
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}
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hcd->rsrc_start = res->start;
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hcd->rsrc_len = resource_size(res);
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hcd->regs = ioremap(res->start, resource_size(res));
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if (!hcd->regs) {
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dev_err(&pdev->dev, "Failed to ioremap registers.\n");
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ret = -EBUSY;
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goto err_release_mem;
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}
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jz4740_ohci->clk = clk_get(&pdev->dev, "uhc");
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if (IS_ERR(jz4740_ohci->clk)) {
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ret = PTR_ERR(jz4740_ohci->clk);
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dev_err(&pdev->dev, "Failed to get clock: %d\n", ret);
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goto err_iounmap;
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}
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jz4740_ohci->vbus = regulator_get(&pdev->dev, "vbus");
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if (IS_ERR(jz4740_ohci->vbus))
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jz4740_ohci->vbus = NULL;
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clk_set_rate(jz4740_ohci->clk, 48000000);
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clk_enable(jz4740_ohci->clk);
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if (jz4740_ohci->vbus)
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ohci_jz4740_set_vbus_power(jz4740_ohci, true);
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platform_set_drvdata(pdev, hcd);
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ohci_hcd_init(hcd_to_ohci(hcd));
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ret = usb_add_hcd(hcd, irq, 0);
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if (ret) {
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dev_err(&pdev->dev, "Failed to add hcd: %d\n", ret);
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goto err_disable;
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}
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return 0;
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err_disable:
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platform_set_drvdata(pdev, NULL);
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if (jz4740_ohci->vbus) {
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regulator_disable(jz4740_ohci->vbus);
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regulator_put(jz4740_ohci->vbus);
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}
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clk_disable(jz4740_ohci->clk);
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clk_put(jz4740_ohci->clk);
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err_iounmap:
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iounmap(hcd->regs);
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err_release_mem:
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release_mem_region(res->start, resource_size(res));
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err_free:
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usb_put_hcd(hcd);
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return ret;
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}
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static __devexit int jz4740_ohci_remove(struct platform_device *pdev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(pdev);
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struct jz4740_ohci_hcd *jz4740_ohci = hcd_to_jz4740_hcd(hcd);
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usb_remove_hcd(hcd);
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platform_set_drvdata(pdev, NULL);
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if (jz4740_ohci->vbus) {
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regulator_disable(jz4740_ohci->vbus);
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regulator_put(jz4740_ohci->vbus);
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}
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clk_disable(jz4740_ohci->clk);
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clk_put(jz4740_ohci->clk);
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iounmap(hcd->regs);
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release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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usb_put_hcd(hcd);
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return 0;
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}
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static struct platform_driver ohci_hcd_jz4740_driver = {
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.probe = jz4740_ohci_probe,
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.remove = __devexit_p(jz4740_ohci_remove),
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.driver = {
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.name = "jz4740-ohci",
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.owner = THIS_MODULE,
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},
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};
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MODULE_ALIAS("platform:jz4740-ohci");
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