linux/drivers/usb/musb/jz4740.c
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   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
  26struct jz4740_glue {
  27        struct device           *dev;
  28        struct platform_device  *musb;
  29        struct clk              *clk;
  30};
  31
  32static 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
  60static 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
  66static 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
  77static struct musb_hdrc_platform_data jz4740_musb_platform_data = {
  78        .mode   = MUSB_PERIPHERAL,
  79        .config = &jz4740_musb_config,
  80};
  81
  82static 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 (!musb->xceiv) {
  87                pr_err("HS UDC: no transceiver configured\n");
  88                return -ENODEV;
  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
 101static int jz4740_musb_exit(struct musb *musb)
 102{
 103        usb_put_phy(musb->xceiv);
 104
 105        return 0;
 106}
 107
 108static const struct musb_platform_ops jz4740_musb_ops = {
 109        .quirks         = MUSB_INDEXED_EP,
 110        .fifo_mode      = 2,
 111        .init           = jz4740_musb_init,
 112        .exit           = jz4740_musb_exit,
 113};
 114
 115static int jz4740_probe(struct platform_device *pdev)
 116{
 117        struct musb_hdrc_platform_data  *pdata = &jz4740_musb_platform_data;
 118        struct platform_device          *musb;
 119        struct jz4740_glue              *glue;
 120        struct clk                      *clk;
 121        int                             ret;
 122
 123        glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
 124        if (!glue)
 125                return -ENOMEM;
 126
 127        musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
 128        if (!musb) {
 129                dev_err(&pdev->dev, "failed to allocate musb device\n");
 130                return -ENOMEM;
 131        }
 132
 133        clk = devm_clk_get(&pdev->dev, "udc");
 134        if (IS_ERR(clk)) {
 135                dev_err(&pdev->dev, "failed to get clock\n");
 136                ret = PTR_ERR(clk);
 137                goto err_platform_device_put;
 138        }
 139
 140        ret = clk_prepare_enable(clk);
 141        if (ret) {
 142                dev_err(&pdev->dev, "failed to enable clock\n");
 143                goto err_platform_device_put;
 144        }
 145
 146        musb->dev.parent                = &pdev->dev;
 147
 148        glue->dev                       = &pdev->dev;
 149        glue->musb                      = musb;
 150        glue->clk                       = clk;
 151
 152        pdata->platform_ops             = &jz4740_musb_ops;
 153
 154        platform_set_drvdata(pdev, glue);
 155
 156        ret = platform_device_add_resources(musb, pdev->resource,
 157                                            pdev->num_resources);
 158        if (ret) {
 159                dev_err(&pdev->dev, "failed to add resources\n");
 160                goto err_clk_disable;
 161        }
 162
 163        ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
 164        if (ret) {
 165                dev_err(&pdev->dev, "failed to add platform_data\n");
 166                goto err_clk_disable;
 167        }
 168
 169        ret = platform_device_add(musb);
 170        if (ret) {
 171                dev_err(&pdev->dev, "failed to register musb device\n");
 172                goto err_clk_disable;
 173        }
 174
 175        return 0;
 176
 177err_clk_disable:
 178        clk_disable_unprepare(clk);
 179err_platform_device_put:
 180        platform_device_put(musb);
 181        return ret;
 182}
 183
 184static int jz4740_remove(struct platform_device *pdev)
 185{
 186        struct jz4740_glue      *glue = platform_get_drvdata(pdev);
 187
 188        platform_device_unregister(glue->musb);
 189        usb_phy_generic_unregister(pdev);
 190        clk_disable_unprepare(glue->clk);
 191
 192        return 0;
 193}
 194
 195static struct platform_driver jz4740_driver = {
 196        .probe          = jz4740_probe,
 197        .remove         = jz4740_remove,
 198        .driver         = {
 199                .name   = "musb-jz4740",
 200        },
 201};
 202
 203MODULE_DESCRIPTION("JZ4740 MUSB Glue Layer");
 204MODULE_AUTHOR("Apelete Seketeli <apelete@seketeli.net>");
 205MODULE_LICENSE("GPL v2");
 206module_platform_driver(jz4740_driver);
 207
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