337 lines
7.1 KiB
C
337 lines
7.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* snps_udc_plat.c - Synopsys UDC Platform Driver
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*
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* Copyright (C) 2016 Broadcom
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*/
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#include <linux/extcon.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/of_gpio.h>
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#include <linux/platform_device.h>
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#include <linux/phy/phy.h>
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#include <linux/module.h>
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#include <linux/dmapool.h>
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#include <linux/interrupt.h>
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#include <linux/moduleparam.h>
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#include "amd5536udc.h"
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/* description */
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#define UDC_MOD_DESCRIPTION "Synopsys UDC platform driver"
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static void start_udc(struct udc *udc)
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{
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if (udc->driver) {
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dev_info(udc->dev, "Connecting...\n");
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udc_enable_dev_setup_interrupts(udc);
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udc_basic_init(udc);
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udc->connected = 1;
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}
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}
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static void stop_udc(struct udc *udc)
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{
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int tmp;
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u32 reg;
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spin_lock(&udc->lock);
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/* Flush the receieve fifo */
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reg = readl(&udc->regs->ctl);
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reg |= AMD_BIT(UDC_DEVCTL_SRX_FLUSH);
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writel(reg, &udc->regs->ctl);
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reg = readl(&udc->regs->ctl);
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reg &= ~(AMD_BIT(UDC_DEVCTL_SRX_FLUSH));
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writel(reg, &udc->regs->ctl);
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dev_dbg(udc->dev, "ep rx queue flushed\n");
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/* Mask interrupts. Required more so when the
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* UDC is connected to a DRD phy.
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*/
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udc_mask_unused_interrupts(udc);
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/* Disconnect gadget driver */
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if (udc->driver) {
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spin_unlock(&udc->lock);
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udc->driver->disconnect(&udc->gadget);
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spin_lock(&udc->lock);
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/* empty queues */
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for (tmp = 0; tmp < UDC_EP_NUM; tmp++)
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empty_req_queue(&udc->ep[tmp]);
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}
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udc->connected = 0;
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spin_unlock(&udc->lock);
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dev_info(udc->dev, "Device disconnected\n");
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}
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static void udc_drd_work(struct work_struct *work)
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{
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struct udc *udc;
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udc = container_of(to_delayed_work(work),
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struct udc, drd_work);
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if (udc->conn_type) {
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dev_dbg(udc->dev, "idle -> device\n");
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start_udc(udc);
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} else {
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dev_dbg(udc->dev, "device -> idle\n");
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stop_udc(udc);
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}
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}
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static int usbd_connect_notify(struct notifier_block *self,
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unsigned long event, void *ptr)
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{
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struct udc *udc = container_of(self, struct udc, nb);
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dev_dbg(udc->dev, "%s: event: %lu\n", __func__, event);
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udc->conn_type = event;
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schedule_delayed_work(&udc->drd_work, 0);
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return NOTIFY_OK;
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}
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static int udc_plat_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct resource *res;
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struct udc *udc;
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int ret;
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udc = devm_kzalloc(dev, sizeof(*udc), GFP_KERNEL);
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if (!udc)
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return -ENOMEM;
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spin_lock_init(&udc->lock);
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udc->dev = dev;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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udc->virt_addr = devm_ioremap_resource(dev, res);
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if (IS_ERR(udc->regs))
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return PTR_ERR(udc->regs);
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/* udc csr registers base */
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udc->csr = udc->virt_addr + UDC_CSR_ADDR;
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/* dev registers base */
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udc->regs = udc->virt_addr + UDC_DEVCFG_ADDR;
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/* ep registers base */
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udc->ep_regs = udc->virt_addr + UDC_EPREGS_ADDR;
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/* fifo's base */
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udc->rxfifo = (u32 __iomem *)(udc->virt_addr + UDC_RXFIFO_ADDR);
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udc->txfifo = (u32 __iomem *)(udc->virt_addr + UDC_TXFIFO_ADDR);
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udc->phys_addr = (unsigned long)res->start;
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udc->irq = irq_of_parse_and_map(dev->of_node, 0);
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if (udc->irq <= 0) {
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dev_err(dev, "Can't parse and map interrupt\n");
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return -EINVAL;
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}
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udc->udc_phy = devm_of_phy_get_by_index(dev, dev->of_node, 0);
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if (IS_ERR(udc->udc_phy)) {
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dev_err(dev, "Failed to obtain phy from device tree\n");
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return PTR_ERR(udc->udc_phy);
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}
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ret = phy_init(udc->udc_phy);
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if (ret) {
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dev_err(dev, "UDC phy init failed");
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return ret;
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}
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ret = phy_power_on(udc->udc_phy);
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if (ret) {
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dev_err(dev, "UDC phy power on failed");
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phy_exit(udc->udc_phy);
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return ret;
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}
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/* Register for extcon if supported */
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if (of_get_property(dev->of_node, "extcon", NULL)) {
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udc->edev = extcon_get_edev_by_phandle(dev, 0);
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if (IS_ERR(udc->edev)) {
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if (PTR_ERR(udc->edev) == -EPROBE_DEFER)
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return -EPROBE_DEFER;
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dev_err(dev, "Invalid or missing extcon\n");
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ret = PTR_ERR(udc->edev);
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goto exit_phy;
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}
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udc->nb.notifier_call = usbd_connect_notify;
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ret = extcon_register_notifier(udc->edev, EXTCON_USB,
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&udc->nb);
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if (ret < 0) {
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dev_err(dev, "Can't register extcon device\n");
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goto exit_phy;
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}
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ret = extcon_get_state(udc->edev, EXTCON_USB);
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if (ret < 0) {
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dev_err(dev, "Can't get cable state\n");
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goto exit_extcon;
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} else if (ret) {
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udc->conn_type = ret;
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}
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INIT_DELAYED_WORK(&udc->drd_work, udc_drd_work);
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}
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/* init dma pools */
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if (use_dma) {
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ret = init_dma_pools(udc);
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if (ret != 0)
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goto exit_extcon;
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}
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ret = devm_request_irq(dev, udc->irq, udc_irq, IRQF_SHARED,
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"snps-udc", udc);
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if (ret < 0) {
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dev_err(dev, "Request irq %d failed for UDC\n", udc->irq);
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goto exit_dma;
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}
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platform_set_drvdata(pdev, udc);
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udc->chiprev = UDC_BCM_REV;
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if (udc_probe(udc)) {
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ret = -ENODEV;
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goto exit_dma;
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}
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dev_info(dev, "Synopsys UDC platform driver probe successful\n");
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return 0;
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exit_dma:
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if (use_dma)
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free_dma_pools(udc);
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exit_extcon:
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if (udc->edev)
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extcon_unregister_notifier(udc->edev, EXTCON_USB, &udc->nb);
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exit_phy:
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if (udc->udc_phy) {
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phy_power_off(udc->udc_phy);
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phy_exit(udc->udc_phy);
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}
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return ret;
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}
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static int udc_plat_remove(struct platform_device *pdev)
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{
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struct udc *dev;
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dev = platform_get_drvdata(pdev);
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usb_del_gadget_udc(&dev->gadget);
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/* gadget driver must not be registered */
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if (WARN_ON(dev->driver))
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return 0;
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/* dma pool cleanup */
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free_dma_pools(dev);
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udc_remove(dev);
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platform_set_drvdata(pdev, NULL);
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if (dev->drd_wq) {
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flush_workqueue(dev->drd_wq);
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destroy_workqueue(dev->drd_wq);
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}
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phy_power_off(dev->udc_phy);
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phy_exit(dev->udc_phy);
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extcon_unregister_notifier(dev->edev, EXTCON_USB, &dev->nb);
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dev_info(&pdev->dev, "Synopsys UDC platform driver removed\n");
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int udc_plat_suspend(struct device *dev)
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{
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struct udc *udc;
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udc = dev_get_drvdata(dev);
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stop_udc(udc);
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if (extcon_get_state(udc->edev, EXTCON_USB) > 0) {
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dev_dbg(udc->dev, "device -> idle\n");
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stop_udc(udc);
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}
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phy_power_off(udc->udc_phy);
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phy_exit(udc->udc_phy);
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return 0;
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}
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static int udc_plat_resume(struct device *dev)
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{
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struct udc *udc;
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int ret;
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udc = dev_get_drvdata(dev);
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ret = phy_init(udc->udc_phy);
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if (ret) {
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dev_err(udc->dev, "UDC phy init failure");
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return ret;
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}
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ret = phy_power_on(udc->udc_phy);
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if (ret) {
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dev_err(udc->dev, "UDC phy power on failure");
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phy_exit(udc->udc_phy);
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return ret;
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}
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if (extcon_get_state(udc->edev, EXTCON_USB) > 0) {
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dev_dbg(udc->dev, "idle -> device\n");
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start_udc(udc);
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}
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return 0;
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}
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static const struct dev_pm_ops udc_plat_pm_ops = {
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.suspend = udc_plat_suspend,
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.resume = udc_plat_resume,
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};
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#endif
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#if defined(CONFIG_OF)
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static const struct of_device_id of_udc_match[] = {
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{ .compatible = "brcm,ns2-udc", },
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{ .compatible = "brcm,cygnus-udc", },
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{ .compatible = "brcm,iproc-udc", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, of_udc_match);
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#endif
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static struct platform_driver udc_plat_driver = {
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.probe = udc_plat_probe,
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.remove = udc_plat_remove,
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.driver = {
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.name = "snps-udc-plat",
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.of_match_table = of_match_ptr(of_udc_match),
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#ifdef CONFIG_PM_SLEEP
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.pm = &udc_plat_pm_ops,
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#endif
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},
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};
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module_platform_driver(udc_plat_driver);
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MODULE_DESCRIPTION(UDC_MOD_DESCRIPTION);
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MODULE_AUTHOR("Broadcom");
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MODULE_LICENSE("GPL v2");
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