drivers/usb/musb/jz4740.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Ingenic JZ4740 "glue layer"
   4  *
   5  * Copyright (C) 2013, Apelete Seketeli <apelete@seketeli.net>
   6  */
   7
   8 #include <linux/clk.h>
   9 #include <linux/dma-mapping.h>
  10 #include <linux/errno.h>
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/of_device.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/usb/usb_phy_generic.h>
  16
  17 #include "musb_core.h"
  18
  19 struct jz4740_glue {
  20         struct device           *dev;
  21         struct platform_device  *musb;
  22         struct clk              *clk;
  23 };
  24
  25 static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci)
  26 {
  27         unsigned long   flags;
  28         irqreturn_t     retval = IRQ_NONE;
  29         struct musb     *musb = __hci;
  30
  31         spin_lock_irqsave(&musb->lock, flags);
  32
  33         musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
  34         musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
  35         musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
  36
  37         /*
  38          * The controller is gadget only, the state of the host mode IRQ bits is
  39          * undefined. Mask them to make sure that the musb driver core will
  40          * never see them set
  41          */
  42         musb->int_usb &= MUSB_INTR_SUSPEND | MUSB_INTR_RESUME |
  43             MUSB_INTR_RESET | MUSB_INTR_SOF;
  44
  45         if (musb->int_usb || musb->int_tx || musb->int_rx)
  46                 retval = musb_interrupt(musb);
  47
  48         spin_unlock_irqrestore(&musb->lock, flags);
  49
  50         return retval;
  51 }
  52
  53 static struct musb_fifo_cfg jz4740_musb_fifo_cfg[] = {
  54 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
  55 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
  56 { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 64, },
  57 };
  58
  59 static const struct musb_hdrc_config jz4740_musb_config = {
  60         /* Silicon does not implement USB OTG. */
  61         .multipoint = 0,
  62         /* Max EPs scanned, driver will decide which EP can be used. */
  63         .num_eps    = 4,
  64         /* RAMbits needed to configure EPs from table */
  65         .ram_bits   = 9,
  66         .fifo_cfg = jz4740_musb_fifo_cfg,
  67         .fifo_cfg_size = ARRAY_SIZE(jz4740_musb_fifo_cfg),
  68 };
  69
  70 static struct musb_hdrc_platform_data jz4740_musb_platform_data = {
  71         .mode   = MUSB_PERIPHERAL,
  72         .config = &jz4740_musb_config,
  73 };
  74
  75 static int jz4740_musb_init(struct musb *musb)
  76 {
  77         struct device *dev = musb->controller->parent;
  78
  79         if (dev->of_node)
  80                 musb->xceiv = devm_usb_get_phy_by_phandle(dev, "phys", 0);
  81         else
  82                 musb->xceiv = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
  83         if (IS_ERR(musb->xceiv)) {
  84                 dev_err(dev, "No transceiver configured\n");
  85                 return PTR_ERR(musb->xceiv);
  86         }
  87
  88         /* Silicon does not implement ConfigData register.
  89          * Set dyn_fifo to avoid reading EP config from hardware.
  90          */
  91         musb->dyn_fifo = true;
  92
  93         musb->isr = jz4740_musb_interrupt;
  94
  95         return 0;
  96 }
  97
  98 /*
  99  * DMA has not been confirmed to work with CONFIG_USB_INVENTRA_DMA,
 100  * so let's not set up the dma function pointers yet.
 101  */
 102 static const struct musb_platform_ops jz4740_musb_ops = {
 103         .quirks         = MUSB_DMA_INVENTRA | MUSB_INDEXED_EP,
 104         .fifo_mode      = 2,
 105         .init           = jz4740_musb_init,
 106 };
 107
 108 static int jz4740_probe(struct platform_device *pdev)
 109 {
 110         struct musb_hdrc_platform_data  *pdata = &jz4740_musb_platform_data;
 111         struct platform_device          *musb;
 112         struct jz4740_glue              *glue;
 113         struct clk                      *clk;
 114         int                             ret;
 115
 116         glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
 117         if (!glue)
 118                 return -ENOMEM;
 119
 120         musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
 121         if (!musb) {
 122                 dev_err(&pdev->dev, "failed to allocate musb device\n");
 123                 return -ENOMEM;
 124         }
 125
 126         clk = devm_clk_get(&pdev->dev, "udc");
 127         if (IS_ERR(clk)) {
 128                 dev_err(&pdev->dev, "failed to get clock\n");
 129                 ret = PTR_ERR(clk);
 130                 goto err_platform_device_put;
 131         }
 132
 133         ret = clk_prepare_enable(clk);
 134         if (ret) {
 135                 dev_err(&pdev->dev, "failed to enable clock\n");
 136                 goto err_platform_device_put;
 137         }
 138
 139         musb->dev.parent                = &pdev->dev;
 140
 141         glue->dev                       = &pdev->dev;
 142         glue->musb                      = musb;
 143         glue->clk                       = clk;
 144
 145         pdata->platform_ops             = &jz4740_musb_ops;
 146
 147         platform_set_drvdata(pdev, glue);
 148
 149         ret = platform_device_add_resources(musb, pdev->resource,
 150                                             pdev->num_resources);
 151         if (ret) {
 152                 dev_err(&pdev->dev, "failed to add resources\n");
 153                 goto err_clk_disable;
 154         }
 155
 156         ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
 157         if (ret) {
 158                 dev_err(&pdev->dev, "failed to add platform_data\n");
 159                 goto err_clk_disable;
 160         }
 161
 162         ret = platform_device_add(musb);
 163         if (ret) {
 164                 dev_err(&pdev->dev, "failed to register musb device\n");
 165                 goto err_clk_disable;
 166         }
 167
 168         return 0;
 169
 170 err_clk_disable:
 171         clk_disable_unprepare(clk);
 172 err_platform_device_put:
 173         platform_device_put(musb);
 174         return ret;
 175 }
 176
 177 static int jz4740_remove(struct platform_device *pdev)
 178 {
 179         struct jz4740_glue      *glue = platform_get_drvdata(pdev);
 180
 181         platform_device_unregister(glue->musb);
 182         clk_disable_unprepare(glue->clk);
 183
 184         return 0;
 185 }
 186
 187 #ifdef CONFIG_OF
 188 static const struct of_device_id jz4740_musb_of_match[] = {
 189         { .compatible = "ingenic,jz4740-musb" },
 190         {},
 191 };
 192 MODULE_DEVICE_TABLE(of, jz4740_musb_of_match);
 193 #endif
 194
 195 static struct platform_driver jz4740_driver = {
 196         .probe          = jz4740_probe,
 197         .remove         = jz4740_remove,
 198         .driver         = {
 199                 .name   = "musb-jz4740",
 200                 .of_match_table = of_match_ptr(jz4740_musb_of_match),
 201         },
 202 };
 203
 204 MODULE_DESCRIPTION("JZ4740 MUSB Glue Layer");
 205 MODULE_AUTHOR("Apelete Seketeli <apelete@seketeli.net>");
 206 MODULE_LICENSE("GPL v2");
 207 module_platform_driver(jz4740_driver);