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// SPDX-License-Identifier: GPL-2.0
/*
* Nuvoton NPCM7xx driver for EHCI HCD
*
* Copyright (C) 2018 Nuvoton Technologies,
* Avi Fishman <avi.fishman@nuvoton.com> <avifishman70@gmail.com>
* Tomer Maimon <tomer.maimon@nuvoton.com> <tmaimon77@gmail.com>
*
* Based on various ehci-spear.c driver
*/
#include <linux/dma-mapping.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include "ehci.h"
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>
#define DRIVER_DESC "EHCI npcm7xx driver"
static const char hcd_name[] = "npcm7xx-ehci";
#define USB2PHYCTL_OFFSET 0x144
#define IPSRST2_OFFSET 0x24
#define IPSRST3_OFFSET 0x34
static struct hc_driver __read_mostly ehci_npcm7xx_hc_driver;
static int __maybe_unused ehci_npcm7xx_drv_suspend(struct device *dev)
{
struct usb_hcd *hcd = dev_get_drvdata(dev);
bool do_wakeup = device_may_wakeup(dev);
return ehci_suspend(hcd, do_wakeup);
}
static int __maybe_unused ehci_npcm7xx_drv_resume(struct device *dev)
{
struct usb_hcd *hcd = dev_get_drvdata(dev);
ehci_resume(hcd, false);
return 0;
}
static SIMPLE_DEV_PM_OPS(ehci_npcm7xx_pm_ops, ehci_npcm7xx_drv_suspend,
ehci_npcm7xx_drv_resume);
static int npcm7xx_ehci_hcd_drv_probe(struct platform_device *pdev)
{
struct usb_hcd *hcd;
struct resource *res;
struct regmap *gcr_regmap;
struct regmap *rst_regmap;
const struct hc_driver *driver = &ehci_npcm7xx_hc_driver;
int irq;
int retval;
dev_dbg(&pdev->dev, "initializing npcm7xx ehci USB Controller\n");
gcr_regmap = syscon_regmap_lookup_by_compatible("nuvoton,npcm750-gcr");
if (IS_ERR(gcr_regmap)) {
dev_err(&pdev->dev, "%s: failed to find nuvoton,npcm750-gcr\n",
__func__);
return PTR_ERR(gcr_regmap);
}
rst_regmap = syscon_regmap_lookup_by_compatible("nuvoton,npcm750-rst");
if (IS_ERR(rst_regmap)) {
dev_err(&pdev->dev, "%s: failed to find nuvoton,npcm750-rst\n",
__func__);
return PTR_ERR(rst_regmap);
}
/********* phy init ******/
// reset usb host
regmap_update_bits(rst_regmap, IPSRST2_OFFSET,
(0x1 << 26), (0x1 << 26));
regmap_update_bits(rst_regmap, IPSRST3_OFFSET,
(0x1 << 25), (0x1 << 25));
regmap_update_bits(gcr_regmap, USB2PHYCTL_OFFSET,
(0x1 << 28), 0);
udelay(1);
// enable phy
regmap_update_bits(rst_regmap, IPSRST3_OFFSET,
(0x1 << 25), 0);
udelay(50); // enable phy
regmap_update_bits(gcr_regmap, USB2PHYCTL_OFFSET,
(0x1 << 28), (0x1 << 28));
// enable host
regmap_update_bits(rst_regmap, IPSRST2_OFFSET,
(0x1 << 26), 0);
if (usb_disabled())
return -ENODEV;
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
retval = irq;
goto fail;
}
/*
* 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.
*/
retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
if (retval)
goto fail;
hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
if (!hcd) {
retval = -ENOMEM;
goto fail;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
hcd->regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(hcd->regs)) {
retval = PTR_ERR(hcd->regs);
goto err_put_hcd;
}
hcd->rsrc_start = res->start;
hcd->rsrc_len = resource_size(res);
/* registers start at offset 0x0 */
hcd_to_ehci(hcd)->caps = hcd->regs;
retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
if (retval)
goto err_put_hcd;
device_wakeup_enable(hcd->self.controller);
return retval;
err_put_hcd:
usb_put_hcd(hcd);
fail:
dev_err(&pdev->dev, "init fail, %d\n", retval);
return retval;
}
static int npcm7xx_ehci_hcd_drv_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
usb_remove_hcd(hcd);
usb_put_hcd(hcd);
return 0;
}
static const struct of_device_id npcm7xx_ehci_id_table[] = {
{ .compatible = "nuvoton,npcm750-ehci" },
{ },
};
MODULE_DEVICE_TABLE(of, npcm7xx_ehci_id_table);
static struct platform_driver npcm7xx_ehci_hcd_driver = {
.probe = npcm7xx_ehci_hcd_drv_probe,
.remove = npcm7xx_ehci_hcd_drv_remove,
.shutdown = usb_hcd_platform_shutdown,
.driver = {
.name = "npcm7xx-ehci",
.bus = &platform_bus_type,
.pm = pm_ptr(&ehci_npcm7xx_pm_ops),
.of_match_table = npcm7xx_ehci_id_table,
}
};
static int __init ehci_npcm7xx_init(void)
{
if (usb_disabled())
return -ENODEV;
pr_info("%s: " DRIVER_DESC "\n", hcd_name);
ehci_init_driver(&ehci_npcm7xx_hc_driver, NULL);
return platform_driver_register(&npcm7xx_ehci_hcd_driver);
}
module_init(ehci_npcm7xx_init);
static void __exit ehci_npcm7xx_cleanup(void)
{
platform_driver_unregister(&npcm7xx_ehci_hcd_driver);
}
module_exit(ehci_npcm7xx_cleanup);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_ALIAS("platform:npcm7xx-ehci");
MODULE_AUTHOR("Avi Fishman");
MODULE_LICENSE("GPL v2");
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