123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211 |
- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Ingenic JZ4740 "glue layer"
- *
- * Copyright (C) 2013, Apelete Seketeli <apelete@seketeli.net>
- */
- #include <linux/clk.h>
- #include <linux/dma-mapping.h>
- #include <linux/errno.h>
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/of_device.h>
- #include <linux/platform_device.h>
- #include <linux/usb/usb_phy_generic.h>
- #include "musb_core.h"
- struct jz4740_glue {
- struct device *dev;
- struct platform_device *musb;
- struct clk *clk;
- };
- static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci)
- {
- unsigned long flags;
- irqreturn_t retval = IRQ_NONE;
- struct musb *musb = __hci;
- spin_lock_irqsave(&musb->lock, flags);
- musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
- musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
- musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
- /*
- * The controller is gadget only, the state of the host mode IRQ bits is
- * undefined. Mask them to make sure that the musb driver core will
- * never see them set
- */
- musb->int_usb &= MUSB_INTR_SUSPEND | MUSB_INTR_RESUME |
- MUSB_INTR_RESET | MUSB_INTR_SOF;
- if (musb->int_usb || musb->int_tx || musb->int_rx)
- retval = musb_interrupt(musb);
- spin_unlock_irqrestore(&musb->lock, flags);
- return retval;
- }
- static struct musb_fifo_cfg jz4740_musb_fifo_cfg[] = {
- { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
- { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
- { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 64, },
- };
- static const struct musb_hdrc_config jz4740_musb_config = {
- /* Silicon does not implement USB OTG. */
- .multipoint = 0,
- /* Max EPs scanned, driver will decide which EP can be used. */
- .num_eps = 4,
- /* RAMbits needed to configure EPs from table */
- .ram_bits = 9,
- .fifo_cfg = jz4740_musb_fifo_cfg,
- .fifo_cfg_size = ARRAY_SIZE(jz4740_musb_fifo_cfg),
- };
- static struct musb_hdrc_platform_data jz4740_musb_platform_data = {
- .mode = MUSB_PERIPHERAL,
- .config = &jz4740_musb_config,
- };
- static int jz4740_musb_init(struct musb *musb)
- {
- struct device *dev = musb->controller->parent;
- int err;
- if (dev->of_node)
- musb->xceiv = devm_usb_get_phy_by_phandle(dev, "phys", 0);
- else
- musb->xceiv = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
- if (IS_ERR(musb->xceiv)) {
- err = PTR_ERR(musb->xceiv);
- if (err != -EPROBE_DEFER)
- dev_err(dev, "No transceiver configured: %d", err);
- return err;
- }
- /* Silicon does not implement ConfigData register.
- * Set dyn_fifo to avoid reading EP config from hardware.
- */
- musb->dyn_fifo = true;
- musb->isr = jz4740_musb_interrupt;
- return 0;
- }
- /*
- * DMA has not been confirmed to work with CONFIG_USB_INVENTRA_DMA,
- * so let's not set up the dma function pointers yet.
- */
- static const struct musb_platform_ops jz4740_musb_ops = {
- .quirks = MUSB_DMA_INVENTRA | MUSB_INDEXED_EP,
- .fifo_mode = 2,
- .init = jz4740_musb_init,
- };
- static int jz4740_probe(struct platform_device *pdev)
- {
- struct musb_hdrc_platform_data *pdata = &jz4740_musb_platform_data;
- struct platform_device *musb;
- struct jz4740_glue *glue;
- struct clk *clk;
- int ret;
- glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
- if (!glue)
- return -ENOMEM;
- musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
- if (!musb) {
- dev_err(&pdev->dev, "failed to allocate musb device\n");
- return -ENOMEM;
- }
- clk = devm_clk_get(&pdev->dev, "udc");
- if (IS_ERR(clk)) {
- dev_err(&pdev->dev, "failed to get clock\n");
- ret = PTR_ERR(clk);
- goto err_platform_device_put;
- }
- ret = clk_prepare_enable(clk);
- if (ret) {
- dev_err(&pdev->dev, "failed to enable clock\n");
- goto err_platform_device_put;
- }
- musb->dev.parent = &pdev->dev;
- glue->dev = &pdev->dev;
- glue->musb = musb;
- glue->clk = clk;
- pdata->platform_ops = &jz4740_musb_ops;
- platform_set_drvdata(pdev, glue);
- ret = platform_device_add_resources(musb, pdev->resource,
- pdev->num_resources);
- if (ret) {
- dev_err(&pdev->dev, "failed to add resources\n");
- goto err_clk_disable;
- }
- ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
- if (ret) {
- dev_err(&pdev->dev, "failed to add platform_data\n");
- goto err_clk_disable;
- }
- ret = platform_device_add(musb);
- if (ret) {
- dev_err(&pdev->dev, "failed to register musb device\n");
- goto err_clk_disable;
- }
- return 0;
- err_clk_disable:
- clk_disable_unprepare(clk);
- err_platform_device_put:
- platform_device_put(musb);
- return ret;
- }
- static int jz4740_remove(struct platform_device *pdev)
- {
- struct jz4740_glue *glue = platform_get_drvdata(pdev);
- platform_device_unregister(glue->musb);
- clk_disable_unprepare(glue->clk);
- return 0;
- }
- #ifdef CONFIG_OF
- static const struct of_device_id jz4740_musb_of_match[] = {
- { .compatible = "ingenic,jz4740-musb" },
- {},
- };
- MODULE_DEVICE_TABLE(of, jz4740_musb_of_match);
- #endif
- static struct platform_driver jz4740_driver = {
- .probe = jz4740_probe,
- .remove = jz4740_remove,
- .driver = {
- .name = "musb-jz4740",
- .of_match_table = of_match_ptr(jz4740_musb_of_match),
- },
- };
- MODULE_DESCRIPTION("JZ4740 MUSB Glue Layer");
- MODULE_AUTHOR("Apelete Seketeli <apelete@seketeli.net>");
- MODULE_LICENSE("GPL v2");
- module_platform_driver(jz4740_driver);
|