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 #include <linux/usb/usb_phy_generic.h>
  23
  24 #include "musb_core.h"
  25
  26 struct jz4740_glue {
  27         struct device           *dev;
  28         struct platform_device  *musb;
  29         struct clk              *clk;
  30 };
  31
  32 static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci)
  33 {
  34         unsigned long   flags;
  35         irqreturn_t     retval = IRQ_NONE;
  36         struct musb     *musb = __hci;
  37
  38         spin_lock_irqsave(&musb->lock, flags);
  39
  40         musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
  41         musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
  42         musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
  43
  44         /*
  45          * The controller is gadget only, the state of the host mode IRQ bits is
  46          * undefined. Mask them to make sure that the musb driver core will
  47          * never see them set
  48          */
  49         musb->int_usb &= MUSB_INTR_SUSPEND | MUSB_INTR_RESUME |
  50             MUSB_INTR_RESET | MUSB_INTR_SOF;
  51
  52         if (musb->int_usb || musb->int_tx || musb->int_rx)
  53                 retval = musb_interrupt(musb);
  54
  55         spin_unlock_irqrestore(&musb->lock, flags);
  56
  57         return retval;
  58 }
  59
  60 static struct musb_fifo_cfg jz4740_musb_fifo_cfg[] = {
  61 { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
  62 { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
  63 { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 64, },
  64 };
  65
  66 static struct musb_hdrc_config jz4740_musb_config = {
  67         /* Silicon does not implement USB OTG. */
  68         .multipoint = 0,
  69         /* Max EPs scanned, driver will decide which EP can be used. */
  70         .num_eps    = 4,
  71         /* RAMbits needed to configure EPs from table */
  72         .ram_bits   = 9,
  73         .fifo_cfg = jz4740_musb_fifo_cfg,
  74         .fifo_cfg_size = ARRAY_SIZE(jz4740_musb_fifo_cfg),
  75 };
  76
  77 static struct musb_hdrc_platform_data jz4740_musb_platform_data = {
  78         .mode   = MUSB_PERIPHERAL,
  79         .config = &jz4740_musb_config,
  80 };
  81
  82 static int jz4740_musb_init(struct musb *musb)
  83 {
  84         usb_phy_generic_register();
  85         musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
  86         if (IS_ERR(musb->xceiv)) {
  87                 pr_err("HS UDC: no transceiver configured\n");
  88                 return PTR_ERR(musb->xceiv);
  89         }
  90
  91         /* Silicon does not implement ConfigData register.
  92          * Set dyn_fifo to avoid reading EP config from hardware.
  93          */
  94         musb->dyn_fifo = true;
  95
  96         musb->isr = jz4740_musb_interrupt;
  97
  98         return 0;
  99 }
 100
 101 static int jz4740_musb_exit(struct musb *musb)
 102 {
 103         usb_put_phy(musb->xceiv);
 104
 105         return 0;
 106 }
 107
 108 /*
 109  * DMA has not been confirmed to work with CONFIG_USB_INVENTRA_DMA,
 110  * so let's not set up the dma function pointers yet.
 111  */
 112 static const struct musb_platform_ops jz4740_musb_ops = {
 113         .quirks         = MUSB_DMA_INVENTRA | MUSB_INDEXED_EP,
 114         .fifo_mode      = 2,
 115         .init           = jz4740_musb_init,
 116         .exit           = jz4740_musb_exit,
 117 };
 118
 119 static int jz4740_probe(struct platform_device *pdev)
 120 {
 121         struct musb_hdrc_platform_data  *pdata = &jz4740_musb_platform_data;
 122         struct platform_device          *musb;
 123         struct jz4740_glue              *glue;
 124         struct clk                      *clk;
 125         int                             ret;
 126
 127         glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
 128         if (!glue)
 129                 return -ENOMEM;
 130
 131         musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
 132         if (!musb) {
 133                 dev_err(&pdev->dev, "failed to allocate musb device\n");
 134                 return -ENOMEM;
 135         }
 136
 137         clk = devm_clk_get(&pdev->dev, "udc");
 138         if (IS_ERR(clk)) {
 139                 dev_err(&pdev->dev, "failed to get clock\n");
 140                 ret = PTR_ERR(clk);
 141                 goto err_platform_device_put;
 142         }
 143
 144         ret = clk_prepare_enable(clk);
 145         if (ret) {
 146                 dev_err(&pdev->dev, "failed to enable clock\n");
 147                 goto err_platform_device_put;
 148         }
 149
 150         musb->dev.parent                = &pdev->dev;
 151
 152         glue->dev                       = &pdev->dev;
 153         glue->musb                      = musb;
 154         glue->clk                       = clk;
 155
 156         pdata->platform_ops             = &jz4740_musb_ops;
 157
 158         platform_set_drvdata(pdev, glue);
 159
 160         ret = platform_device_add_resources(musb, pdev->resource,
 161                                             pdev->num_resources);
 162         if (ret) {
 163                 dev_err(&pdev->dev, "failed to add resources\n");
 164                 goto err_clk_disable;
 165         }
 166
 167         ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
 168         if (ret) {
 169                 dev_err(&pdev->dev, "failed to add platform_data\n");
 170                 goto err_clk_disable;
 171         }
 172
 173         ret = platform_device_add(musb);
 174         if (ret) {
 175                 dev_err(&pdev->dev, "failed to register musb device\n");
 176                 goto err_clk_disable;
 177         }
 178
 179         return 0;
 180
 181 err_clk_disable:
 182         clk_disable_unprepare(clk);
 183 err_platform_device_put:
 184         platform_device_put(musb);
 185         return ret;
 186 }
 187
 188 static int jz4740_remove(struct platform_device *pdev)
 189 {
 190         struct jz4740_glue      *glue = platform_get_drvdata(pdev);
 191
 192         platform_device_unregister(glue->musb);
 193         usb_phy_generic_unregister(pdev);
 194         clk_disable_unprepare(glue->clk);
 195
 196         return 0;
 197 }
 198
 199 static struct platform_driver jz4740_driver = {
 200         .probe          = jz4740_probe,
 201         .remove         = jz4740_remove,
 202         .driver         = {
 203                 .name   = "musb-jz4740",
 204         },
 205 };
 206
 207 MODULE_DESCRIPTION("JZ4740 MUSB Glue Layer");
 208 MODULE_AUTHOR("Apelete Seketeli <apelete@seketeli.net>");
 209 MODULE_LICENSE("GPL v2");
 210 module_platform_driver(jz4740_driver);