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/platform_device.h>
  14 #include <linux/usb/usb_phy_generic.h>
  15
  16 #include "musb_core.h"
  17
  18 struct jz4740_glue {
  19         struct device           *dev;
  20         struct platform_device  *musb;
  21         struct clk              *clk;
  22 };
  23
  24 static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci)
  25 {
  26         unsigned long   flags;
  27         irqreturn_t     retval = IRQ_NONE;
  28         struct musb     *musb = __hci;
  29
  30         spin_lock_irqsave(&musb->lock, flags);
  31
  32         musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
  33         musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
  34         musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
  35
  36         /*
  37          * The controller is gadget only, the state of the host mode IRQ bits is
  38          * undefined. Mask them to make sure that the musb driver core will
  39          * never see them set
  40          */
  41         musb->int_usb &= MUSB_INTR_SUSPEND | MUSB_INTR_RESUME |
  42             MUSB_INTR_RESET | MUSB_INTR_SOF;
  43
  44         if (musb->int_usb || musb->int_tx || musb->int_rx)
  45                 retval = musb_interrupt(musb);
  46
  47         spin_unlock_irqrestore(&musb->lock, flags);
  48
  49         return retval;
  50 }
  51
  52 static struct musb_fifo_cfg jz4740_musb_fifo_cfg[] = {
  53 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
  54 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
  55 { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 64, },
  56 };
  57
  58 static const struct musb_hdrc_config jz4740_musb_config = {
  59         /* Silicon does not implement USB OTG. */
  60         .multipoint = 0,
  61         /* Max EPs scanned, driver will decide which EP can be used. */
  62         .num_eps    = 4,
  63         /* RAMbits needed to configure EPs from table */
  64         .ram_bits   = 9,
  65         .fifo_cfg = jz4740_musb_fifo_cfg,
  66         .fifo_cfg_size = ARRAY_SIZE(jz4740_musb_fifo_cfg),
  67 };
  68
  69 static struct musb_hdrc_platform_data jz4740_musb_platform_data = {
  70         .mode   = MUSB_PERIPHERAL,
  71         .config = &jz4740_musb_config,
  72 };
  73
  74 static int jz4740_musb_init(struct musb *musb)
  75 {
  76         usb_phy_generic_register();
  77         musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
  78         if (IS_ERR(musb->xceiv)) {
  79                 pr_err("HS UDC: no transceiver configured\n");
  80                 return PTR_ERR(musb->xceiv);
  81         }
  82
  83         /* Silicon does not implement ConfigData register.
  84          * Set dyn_fifo to avoid reading EP config from hardware.
  85          */
  86         musb->dyn_fifo = true;
  87
  88         musb->isr = jz4740_musb_interrupt;
  89
  90         return 0;
  91 }
  92
  93 static int jz4740_musb_exit(struct musb *musb)
  94 {
  95         usb_put_phy(musb->xceiv);
  96
  97         return 0;
  98 }
  99
 100 /*
 101  * DMA has not been confirmed to work with CONFIG_USB_INVENTRA_DMA,
 102  * so let's not set up the dma function pointers yet.
 103  */
 104 static const struct musb_platform_ops jz4740_musb_ops = {
 105         .quirks         = MUSB_DMA_INVENTRA | MUSB_INDEXED_EP,
 106         .fifo_mode      = 2,
 107         .init           = jz4740_musb_init,
 108         .exit           = jz4740_musb_exit,
 109 };
 110
 111 static int jz4740_probe(struct platform_device *pdev)
 112 {
 113         struct musb_hdrc_platform_data  *pdata = &jz4740_musb_platform_data;
 114         struct platform_device          *musb;
 115         struct jz4740_glue              *glue;
 116         struct clk                      *clk;
 117         int                             ret;
 118
 119         glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
 120         if (!glue)
 121                 return -ENOMEM;
 122
 123         musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
 124         if (!musb) {
 125                 dev_err(&pdev->dev, "failed to allocate musb device\n");
 126                 return -ENOMEM;
 127         }
 128
 129         clk = devm_clk_get(&pdev->dev, "udc");
 130         if (IS_ERR(clk)) {
 131                 dev_err(&pdev->dev, "failed to get clock\n");
 132                 ret = PTR_ERR(clk);
 133                 goto err_platform_device_put;
 134         }
 135
 136         ret = clk_prepare_enable(clk);
 137         if (ret) {
 138                 dev_err(&pdev->dev, "failed to enable clock\n");
 139                 goto err_platform_device_put;
 140         }
 141
 142         musb->dev.parent                = &pdev->dev;
 143
 144         glue->dev                       = &pdev->dev;
 145         glue->musb                      = musb;
 146         glue->clk                       = clk;
 147
 148         pdata->platform_ops             = &jz4740_musb_ops;
 149
 150         platform_set_drvdata(pdev, glue);
 151
 152         ret = platform_device_add_resources(musb, pdev->resource,
 153                                             pdev->num_resources);
 154         if (ret) {
 155                 dev_err(&pdev->dev, "failed to add resources\n");
 156                 goto err_clk_disable;
 157         }
 158
 159         ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
 160         if (ret) {
 161                 dev_err(&pdev->dev, "failed to add platform_data\n");
 162                 goto err_clk_disable;
 163         }
 164
 165         ret = platform_device_add(musb);
 166         if (ret) {
 167                 dev_err(&pdev->dev, "failed to register musb device\n");
 168                 goto err_clk_disable;
 169         }
 170
 171         return 0;
 172
 173 err_clk_disable:
 174         clk_disable_unprepare(clk);
 175 err_platform_device_put:
 176         platform_device_put(musb);
 177         return ret;
 178 }
 179
 180 static int jz4740_remove(struct platform_device *pdev)
 181 {
 182         struct jz4740_glue      *glue = platform_get_drvdata(pdev);
 183
 184         platform_device_unregister(glue->musb);
 185         usb_phy_generic_unregister(pdev);
 186         clk_disable_unprepare(glue->clk);
 187
 188         return 0;
 189 }
 190
 191 static struct platform_driver jz4740_driver = {
 192         .probe          = jz4740_probe,
 193         .remove         = jz4740_remove,
 194         .driver         = {
 195                 .name   = "musb-jz4740",
 196         },
 197 };
 198
 199 MODULE_DESCRIPTION("JZ4740 MUSB Glue Layer");
 200 MODULE_AUTHOR("Apelete Seketeli <apelete@seketeli.net>");
 201 MODULE_LICENSE("GPL v2");
 202 module_platform_driver(jz4740_driver);