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USB host: Add USB ehci support for nuvoton npcm7xx platform
This patch adds support for ehci controller for the Nuvoton npcm7xx platform. Most of the code was taken from ehci-spear.c + specific initialization code Signed-off-by: Avi Fishman <AviFishman70@gmail.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Avi Fishman
Greg Kroah-Hartman
parent
cae2bc768d
commit
df44831ee2
@ -192,6 +192,14 @@ config USB_EHCI_MXC
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---help---
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Variation of ARC USB block used in some Freescale chips.
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config USB_EHCI_HCD_NPCM7XX
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tristate "Support for Nuvoton NPCM7XX on-chip EHCI USB controller"
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depends on (USB_EHCI_HCD && ARCH_NPCM7XX) || COMPILE_TEST
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default y if (USB_EHCI_HCD && ARCH_NPCM7XX)
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help
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Enables support for the on-chip EHCI controller on
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Nuvoton NPCM7XX chips.
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config USB_EHCI_HCD_OMAP
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tristate "EHCI support for OMAP3 and later chips"
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depends on ARCH_OMAP
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@ -43,6 +43,7 @@ obj-$(CONFIG_USB_EHCI_HCD) += ehci-hcd.o
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obj-$(CONFIG_USB_EHCI_PCI) += ehci-pci.o
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obj-$(CONFIG_USB_EHCI_HCD_PLATFORM) += ehci-platform.o
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obj-$(CONFIG_USB_EHCI_MXC) += ehci-mxc.o
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obj-$(CONFIG_USB_EHCI_HCD_NPCM7XX) += ehci-npcm7xx.o
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obj-$(CONFIG_USB_EHCI_HCD_OMAP) += ehci-omap.o
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obj-$(CONFIG_USB_EHCI_HCD_ORION) += ehci-orion.o
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obj-$(CONFIG_USB_EHCI_HCD_SPEAR) += ehci-spear.o
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212
drivers/usb/host/ehci-npcm7xx.c
Normal file
212
drivers/usb/host/ehci-npcm7xx.c
Normal file
@ -0,0 +1,212 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Nuvoton NPCM7xx driver for EHCI HCD
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*
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* Copyright (C) 2018 Nuvoton Technologies,
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* Avi Fishman <avi.fishman@nuvoton.com> <avifishman70@gmail.com>
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* Tomer Maimon <tomer.maimon@nuvoton.com> <tmaimon77@gmail.com>
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*
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* Based on various ehci-spear.c driver
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*/
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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/of.h>
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#include <linux/platform_device.h>
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#include <linux/pm.h>
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#include <linux/usb.h>
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#include <linux/usb/hcd.h>
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#include "ehci.h"
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#include <linux/regmap.h>
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#include <linux/mfd/syscon.h>
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#define DRIVER_DESC "EHCI npcm7xx driver"
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static const char hcd_name[] = "npcm7xx-ehci";
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#define USB2PHYCTL_OFFSET 0x144
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#define IPSRST2_OFFSET 0x24
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#define IPSRST3_OFFSET 0x34
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static struct hc_driver __read_mostly ehci_npcm7xx_hc_driver;
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#ifdef CONFIG_PM_SLEEP
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static int ehci_npcm7xx_drv_suspend(struct device *dev)
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{
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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bool do_wakeup = device_may_wakeup(dev);
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return ehci_suspend(hcd, do_wakeup);
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}
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static int ehci_npcm7xx_drv_resume(struct device *dev)
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{
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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ehci_resume(hcd, false);
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return 0;
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}
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#endif /* CONFIG_PM_SLEEP */
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static SIMPLE_DEV_PM_OPS(ehci_npcm7xx_pm_ops, ehci_npcm7xx_drv_suspend,
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ehci_npcm7xx_drv_resume);
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static int npcm7xx_ehci_hcd_drv_probe(struct platform_device *pdev)
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{
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struct usb_hcd *hcd;
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struct resource *res;
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struct regmap *gcr_regmap;
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struct regmap *rst_regmap;
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const struct hc_driver *driver = &ehci_npcm7xx_hc_driver;
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int irq;
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int retval;
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dev_dbg(&pdev->dev, "initializing npcm7xx ehci USB Controller\n");
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gcr_regmap = syscon_regmap_lookup_by_compatible("nuvoton,npcm750-gcr");
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if (IS_ERR(gcr_regmap)) {
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dev_err(&pdev->dev, "%s: failed to find nuvoton,npcm750-gcr\n",
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__func__);
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return IS_ERR(gcr_regmap);
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}
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rst_regmap = syscon_regmap_lookup_by_compatible("nuvoton,npcm750-rst");
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if (IS_ERR(rst_regmap)) {
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dev_err(&pdev->dev, "%s: failed to find nuvoton,npcm750-rst\n",
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__func__);
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return IS_ERR(rst_regmap);
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}
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/********* phy init ******/
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// reset usb host
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regmap_update_bits(rst_regmap, IPSRST2_OFFSET,
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(0x1 << 26), (0x1 << 26));
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regmap_update_bits(rst_regmap, IPSRST3_OFFSET,
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(0x1 << 25), (0x1 << 25));
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regmap_update_bits(gcr_regmap, USB2PHYCTL_OFFSET,
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(0x1 << 28), 0);
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udelay(1);
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// enable phy
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regmap_update_bits(rst_regmap, IPSRST3_OFFSET,
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(0x1 << 25), 0);
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udelay(50); // enable phy
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regmap_update_bits(gcr_regmap, USB2PHYCTL_OFFSET,
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(0x1 << 28), (0x1 << 28));
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// enable host
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regmap_update_bits(rst_regmap, IPSRST2_OFFSET,
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(0x1 << 26), 0);
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if (usb_disabled())
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return -ENODEV;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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retval = irq;
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goto fail;
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}
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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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retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
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if (retval)
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goto fail;
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hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
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if (!hcd) {
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retval = -ENOMEM;
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goto fail;
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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hcd->regs = devm_ioremap_resource(&pdev->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_put_hcd;
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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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/* registers start at offset 0x0 */
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hcd_to_ehci(hcd)->caps = hcd->regs;
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retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
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if (retval)
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goto err_put_hcd;
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device_wakeup_enable(hcd->self.controller);
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return retval;
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err_put_hcd:
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usb_put_hcd(hcd);
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fail:
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dev_err(&pdev->dev, "init fail, %d\n", retval);
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return retval;
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}
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static int npcm7xx_ehci_hcd_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 npcm7xx_ehci_id_table[] = {
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{ .compatible = "nuvoton,npcm750-ehci" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, npcm7xx_ehci_id_table);
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static struct platform_driver npcm7xx_ehci_hcd_driver = {
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.probe = npcm7xx_ehci_hcd_drv_probe,
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.remove = npcm7xx_ehci_hcd_drv_remove,
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.shutdown = usb_hcd_platform_shutdown,
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.driver = {
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.name = "npcm7xx-ehci",
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.bus = &platform_bus_type,
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.pm = &ehci_npcm7xx_pm_ops,
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.of_match_table = npcm7xx_ehci_id_table,
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}
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};
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static int __init ehci_npcm7xx_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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ehci_init_driver(&ehci_npcm7xx_hc_driver, NULL);
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return platform_driver_register(&npcm7xx_ehci_hcd_driver);
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}
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module_init(ehci_npcm7xx_init);
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static void __exit ehci_npcm7xx_cleanup(void)
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{
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platform_driver_unregister(&npcm7xx_ehci_hcd_driver);
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}
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module_exit(ehci_npcm7xx_cleanup);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_ALIAS("platform:npcm7xx-ehci");
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MODULE_AUTHOR("Avi Fishman");
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MODULE_LICENSE("GPL v2");
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