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         usb_phy_generic_register();
  78         musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
  79         if (IS_ERR(musb->xceiv)) {
  80                 pr_err("HS UDC: no transceiver configured\n");
  81                 return PTR_ERR(musb->xceiv);
  82         }
  83
  84         /* Silicon does not implement ConfigData register.
  85          * Set dyn_fifo to avoid reading EP config from hardware.
  86          */
  87         musb->dyn_fifo = true;
  88
  89         musb->isr = jz4740_musb_interrupt;
  90
  91         return 0;
  92 }
  93
  94 static int jz4740_musb_exit(struct musb *musb)
  95 {
  96         usb_put_phy(musb->xceiv);
  97
  98         return 0;
  99 }
 100
 101 /*
 102  * DMA has not been confirmed to work with CONFIG_USB_INVENTRA_DMA,
 103  * so let's not set up the dma function pointers yet.
 104  */
 105 static const struct musb_platform_ops jz4740_musb_ops = {
 106         .quirks         = MUSB_DMA_INVENTRA | MUSB_INDEXED_EP,
 107         .fifo_mode      = 2,
 108         .init           = jz4740_musb_init,
 109         .exit           = jz4740_musb_exit,
 110 };
 111
 112 static int jz4740_probe(struct platform_device *pdev)
 113 {
 114         struct musb_hdrc_platform_data  *pdata = &jz4740_musb_platform_data;
 115         struct platform_device          *musb;
 116         struct jz4740_glue              *glue;
 117         struct clk                      *clk;
 118         int                             ret;
 119
 120         glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
 121         if (!glue)
 122                 return -ENOMEM;
 123
 124         musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
 125         if (!musb) {
 126                 dev_err(&pdev->dev, "failed to allocate musb device\n");
 127                 return -ENOMEM;
 128         }
 129
 130         clk = devm_clk_get(&pdev->dev, "udc");
 131         if (IS_ERR(clk)) {
 132                 dev_err(&pdev->dev, "failed to get clock\n");
 133                 ret = PTR_ERR(clk);
 134                 goto err_platform_device_put;
 135         }
 136
 137         ret = clk_prepare_enable(clk);
 138         if (ret) {
 139                 dev_err(&pdev->dev, "failed to enable clock\n");
 140                 goto err_platform_device_put;
 141         }
 142
 143         musb->dev.parent                = &pdev->dev;
 144
 145         glue->dev                       = &pdev->dev;
 146         glue->musb                      = musb;
 147         glue->clk                       = clk;
 148
 149         pdata->platform_ops             = &jz4740_musb_ops;
 150
 151         platform_set_drvdata(pdev, glue);
 152
 153         ret = platform_device_add_resources(musb, pdev->resource,
 154                                             pdev->num_resources);
 155         if (ret) {
 156                 dev_err(&pdev->dev, "failed to add resources\n");
 157                 goto err_clk_disable;
 158         }
 159
 160         ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
 161         if (ret) {
 162                 dev_err(&pdev->dev, "failed to add platform_data\n");
 163                 goto err_clk_disable;
 164         }
 165
 166         ret = platform_device_add(musb);
 167         if (ret) {
 168                 dev_err(&pdev->dev, "failed to register musb device\n");
 169                 goto err_clk_disable;
 170         }
 171
 172         return 0;
 173
 174 err_clk_disable:
 175         clk_disable_unprepare(clk);
 176 err_platform_device_put:
 177         platform_device_put(musb);
 178         return ret;
 179 }
 180
 181 static int jz4740_remove(struct platform_device *pdev)
 182 {
 183         struct jz4740_glue      *glue = platform_get_drvdata(pdev);
 184
 185         platform_device_unregister(glue->musb);
 186         usb_phy_generic_unregister(pdev);
 187         clk_disable_unprepare(glue->clk);
 188
 189         return 0;
 190 }
 191
 192 #ifdef CONFIG_OF
 193 static const struct of_device_id jz4740_musb_of_match[] = {
 194         { .compatible = "ingenic,jz4740-musb" },
 195         {},
 196 };
 197 MODULE_DEVICE_TABLE(of, jz4740_musb_of_match);
 198 #endif
 199
 200 static struct platform_driver jz4740_driver = {
 201         .probe          = jz4740_probe,
 202         .remove         = jz4740_remove,
 203         .driver         = {
 204                 .name   = "musb-jz4740",
 205                 .of_match_table = of_match_ptr(jz4740_musb_of_match),
 206         },
 207 };
 208
 209 MODULE_DESCRIPTION("JZ4740 MUSB Glue Layer");
 210 MODULE_AUTHOR("Apelete Seketeli <apelete@seketeli.net>");
 211 MODULE_LICENSE("GPL v2");
 212 module_platform_driver(jz4740_driver);