drivers/usb/musb/jz4740.c

   1 /*
   2  * Ingenic JZ4740 "glue layer"
   3  *
   4  * Copyright (C) 2013, Apelete Seketeli <apelete@seketeli.net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * You should have received a copy of the GNU General Public License along
  12  * with this program; if not, write to the Free Software Foundation, Inc.,
  13  * 675 Mass Ave, Cambridge, MA 02139, USA.
  14  */
  15
  16 #include <linux/clk.h>
  17 #include <linux/dma-mapping.h>
  18 #include <linux/errno.h>
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/platform_device.h>
  22
  23 #include "musb_core.h"
  24
  25 struct jz4740_glue {
  26         struct device           *dev;
  27         struct platform_device  *musb;
  28         struct clk              *clk;
  29 };
  30
  31 static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci)
  32 {
  33         unsigned long   flags;
  34         irqreturn_t     retval = IRQ_NONE;
  35         struct musb     *musb = __hci;
  36
  37         spin_lock_irqsave(&musb->lock, flags);
  38
  39         musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
  40         musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
  41         musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
  42
  43         /*
  44          * The controller is gadget only, the state of the host mode IRQ bits is
  45          * undefined. Mask them to make sure that the musb driver core will
  46          * never see them set
  47          */
  48         musb->int_usb &= MUSB_INTR_SUSPEND | MUSB_INTR_RESUME |
  49             MUSB_INTR_RESET | MUSB_INTR_SOF;
  50
  51         if (musb->int_usb || musb->int_tx || musb->int_rx)
  52                 retval = musb_interrupt(musb);
  53
  54         spin_unlock_irqrestore(&musb->lock, flags);
  55
  56         return retval;
  57 }
  58
  59 static struct musb_fifo_cfg jz4740_musb_fifo_cfg[] = {
  60 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
  61 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
  62 { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 64, },
  63 };
  64
  65 static struct musb_hdrc_config jz4740_musb_config = {
  66         /* Silicon does not implement USB OTG. */
  67         .multipoint = 0,
  68         /* Max EPs scanned, driver will decide which EP can be used. */
  69         .num_eps    = 4,
  70         /* RAMbits needed to configure EPs from table */
  71         .ram_bits   = 9,
  72         .fifo_cfg = jz4740_musb_fifo_cfg,
  73         .fifo_cfg_size = ARRAY_SIZE(jz4740_musb_fifo_cfg),
  74 };
  75
  76 static struct musb_hdrc_platform_data jz4740_musb_platform_data = {
  77         .mode   = MUSB_PERIPHERAL,
  78         .config = &jz4740_musb_config,
  79 };
  80
  81 static int jz4740_musb_init(struct musb *musb)
  82 {
  83         musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
  84         if (!musb->xceiv) {
  85                 pr_err("HS UDC: no transceiver configured\n");
  86                 return -ENODEV;
  87         }
  88
  89         /* Silicon does not implement ConfigData register.
  90          * Set dyn_fifo to avoid reading EP config from hardware.
  91          */
  92         musb->dyn_fifo = true;
  93
  94         musb->isr = jz4740_musb_interrupt;
  95
  96         return 0;
  97 }
  98
  99 static int jz4740_musb_exit(struct musb *musb)
 100 {
 101         usb_put_phy(musb->xceiv);
 102
 103         return 0;
 104 }
 105
 106 static const struct musb_platform_ops jz4740_musb_ops = {
 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         clk_disable_unprepare(glue->clk);
 186
 187         return 0;
 188 }
 189
 190 static struct platform_driver jz4740_driver = {
 191         .probe          = jz4740_probe,
 192         .remove         = jz4740_remove,
 193         .driver         = {
 194                 .name   = "musb-jz4740",
 195         },
 196 };
 197
 198 MODULE_DESCRIPTION("JZ4740 MUSB Glue Layer");
 199 MODULE_AUTHOR("Apelete Seketeli <apelete@seketeli.net>");
 200 MODULE_LICENSE("GPL v2");
 201 module_platform_driver(jz4740_driver);