176 lines
4.0 KiB
C
176 lines
4.0 KiB
C
/*
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* OHCI HCD (Host Controller Driver) for USB.
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*
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* (C) Copyright 2010 celestialsemi Company
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*
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* Bus Glue for CNC1800H
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*
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* Written by Ran Hao <ran.hao@celestialsemi.cn>
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*
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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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* 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/io.h>
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#include <linux/of_platform.h>
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#include <linux/dma-mapping.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.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 <linux/of_irq.h>
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#include "ohci.h"
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#define DRIVER_DESC "OHCI CNC1800L driver"
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static const char hcd_name[] = "ohci-cnc1800l";
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static struct hc_driver __read_mostly ohci_cnc1800l_hc_driver;
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#define hcd_to_ohci_cnc1800l_priv(h) \
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((struct ohci_cnc1800l_priv *)hcd_to_ohci(h)->priv)
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struct ohci_cnc1800l_priv {
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struct clk *iclk;
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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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static void cnc1800l_start_hc(struct device *dev)
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{
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/*
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* Set register pin to enable and 48MHz
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*/
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uint8_t* clkreg = ioremap(0xB2100218,1);
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// (*((volatile unsigned long *)(IO_ADDRESS(0xB2100218)))) =0x3;
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if(clkreg != NULL)
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*clkreg = 0x3;
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else
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dev_dbg(dev, "ohci: failed to enable 48m clock\n");
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iounmap(clkreg);
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udelay(100);
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}
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static int ohci_hcd_cnc1800l_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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int ret, irq;
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struct usb_hcd *hcd;
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struct device *dev = &pdev->dev;
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struct ohci_cnc1800l_priv *ohci_cnc;
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struct resource *res;
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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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irq = irq_of_parse_and_map(np, 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(&ohci_cnc1800l_hc_driver, dev, dev_name(dev));
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if (!hcd)
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return -ENOMEM;
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ohci_cnc = hcd_to_ohci_cnc1800l_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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ret = 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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cnc1800l_start_hc(dev);
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ret = usb_add_hcd(hcd,irq, IRQF_SHARED);
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if(ret){
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dev_err(&pdev->dev, "Failed to add USB HCD\n");
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goto err;
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}
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device_wakeup_enable(hcd->self.controller);
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return 0;
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err:
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usb_put_hcd(hcd);
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return ret;
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}
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static int ohci_hcd_cnc1800l_drv_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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usb_remove_hcd(hcd);
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usb_put_hcd(hcd);
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return 0;
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}
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static const struct of_device_id ohci_hcd_cnc1800l_dt_ids[] = {
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{ .compatible = "cavium,cnc1800l-ohci" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, ohci_hcd_cnc1800l_dt_ids);
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static struct platform_driver ohci_hcd_cnc1800l_driver = {
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.probe = ohci_hcd_cnc1800l_drv_probe,
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.remove = ohci_hcd_cnc1800l_drv_remove,
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.driver = {
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.name = "cnc1800l-ohci",
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.of_match_table = ohci_hcd_cnc1800l_dt_ids,
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},
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};
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static int __init ohci_cnc1800l_init(void)
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{
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if (usb_disabled())
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return -ENODEV;
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pr_info("%s: " DRIVER_DESC "\n", hcd_name);
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ohci_init_driver(&ohci_cnc1800l_hc_driver, NULL);
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return platform_driver_register(&ohci_hcd_cnc1800l_driver);
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}
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module_init(ohci_cnc1800l_init);
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static void __exit ohci_cnc1800l_cleanup(void)
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{
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platform_driver_unregister(&ohci_hcd_cnc1800l_driver);
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}
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module_exit(ohci_cnc1800l_cleanup);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:cnc1800l-ohci");
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