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>

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 6e64d3a..1a4ea98 100644 (file)
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -192,6 +192,14 @@ config USB_EHCI_MXC
        ---help---
          Variation of ARC USB block used in some Freescale chips.
 
+config USB_EHCI_HCD_NPCM7XX
+       tristate "Support for Nuvoton NPCM7XX on-chip EHCI USB controller"
+       depends on (USB_EHCI_HCD && ARCH_NPCM7XX) || COMPILE_TEST
+       default y if (USB_EHCI_HCD && ARCH_NPCM7XX)
+       help
+         Enables support for the on-chip EHCI controller on
+         Nuvoton NPCM7XX chips.
+
 config USB_EHCI_HCD_OMAP
        tristate "EHCI support for OMAP3 and later chips"
        depends on ARCH_OMAP

diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index 9b669c9..e623526 100644 (file)
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -43,6 +43,7 @@ obj-$(CONFIG_USB_EHCI_HCD)    += ehci-hcd.o
 obj-$(CONFIG_USB_EHCI_PCI)     += ehci-pci.o
 obj-$(CONFIG_USB_EHCI_HCD_PLATFORM)    += ehci-platform.o
 obj-$(CONFIG_USB_EHCI_MXC)     += ehci-mxc.o
+obj-$(CONFIG_USB_EHCI_HCD_NPCM7XX)     += ehci-npcm7xx.o
 obj-$(CONFIG_USB_EHCI_HCD_OMAP)        += ehci-omap.o
 obj-$(CONFIG_USB_EHCI_HCD_ORION)       += ehci-orion.o
 obj-$(CONFIG_USB_EHCI_HCD_SPEAR)       += ehci-spear.o

diff --git a/drivers/usb/host/ehci-npcm7xx.c b/drivers/usb/host/ehci-npcm7xx.c
new file mode 100644 (file)
index 0000000..c80a879
--- /dev/null
+++ b/drivers/usb/host/ehci-npcm7xx.c
@@ -0,0 +1,212 @@
+// 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;
+
+#ifdef CONFIG_PM_SLEEP
+static int 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 ehci_npcm7xx_drv_resume(struct device *dev)
+{
+       struct usb_hcd *hcd = dev_get_drvdata(dev);
+
+       ehci_resume(hcd, false);
+       return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+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 IS_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 IS_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 = &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");