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/role.h>
  16 #include <linux/usb/usb_phy_generic.h>
  17
  18 #include "musb_core.h"
  19
  20 struct jz4740_glue {
  21         struct platform_device  *pdev;
  22         struct musb             *musb;
  23         struct clk              *clk;
  24         struct usb_role_switch  *role_sw;
  25 };
  26
  27 static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci)
  28 {
  29         unsigned long   flags;
  30         irqreturn_t     retval = IRQ_NONE, retval_dma = IRQ_NONE;
  31         struct musb     *musb = __hci;
  32
  33         if (IS_ENABLED(CONFIG_USB_INVENTRA_DMA) && musb->dma_controller)
  34                 retval_dma = dma_controller_irq(irq, musb->dma_controller);
  35
  36         spin_lock_irqsave(&musb->lock, flags);
  37
  38         musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
  39         musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
  40         musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
  41
  42         /*
  43          * The controller is gadget only, the state of the host mode IRQ bits is
  44          * undefined. Mask them to make sure that the musb driver core will
  45          * never see them set
  46          */
  47         musb->int_usb &= MUSB_INTR_SUSPEND | MUSB_INTR_RESUME |
  48                          MUSB_INTR_RESET | MUSB_INTR_SOF;
  49
  50         if (musb->int_usb || musb->int_tx || musb->int_rx)
  51                 retval = musb_interrupt(musb);
  52
  53         spin_unlock_irqrestore(&musb->lock, flags);
  54
  55         if (retval == IRQ_HANDLED || retval_dma == IRQ_HANDLED)
  56                 return IRQ_HANDLED;
  57
  58         return IRQ_NONE;
  59 }
  60
  61 static struct musb_fifo_cfg jz4740_musb_fifo_cfg[] = {
  62         { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
  63         { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
  64         { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 64, },
  65 };
  66
  67 static const struct musb_hdrc_config jz4740_musb_config = {
  68         /* Silicon does not implement USB OTG. */
  69         .multipoint     = 0,
  70         /* Max EPs scanned, driver will decide which EP can be used. */
  71         .num_eps        = 4,
  72         /* RAMbits needed to configure EPs from table */
  73         .ram_bits       = 9,
  74         .fifo_cfg       = jz4740_musb_fifo_cfg,
  75         .fifo_cfg_size  = ARRAY_SIZE(jz4740_musb_fifo_cfg),
  76 };
  77
  78 static int jz4740_musb_role_switch_set(struct usb_role_switch *sw,
  79                                        enum usb_role role)
  80 {
  81         struct jz4740_glue *glue = usb_role_switch_get_drvdata(sw);
  82         struct usb_phy *phy = glue->musb->xceiv;
  83
  84         switch (role) {
  85         case USB_ROLE_NONE:
  86                 atomic_notifier_call_chain(&phy->notifier, USB_EVENT_NONE, phy);
  87                 break;
  88         case USB_ROLE_DEVICE:
  89                 atomic_notifier_call_chain(&phy->notifier, USB_EVENT_VBUS, phy);
  90                 break;
  91         case USB_ROLE_HOST:
  92                 atomic_notifier_call_chain(&phy->notifier, USB_EVENT_ID, phy);
  93                 break;
  94         }
  95
  96         return 0;
  97 }
  98
  99 static int jz4740_musb_init(struct musb *musb)
 100 {
 101         struct device *dev = musb->controller->parent;
 102         struct jz4740_glue *glue = dev_get_drvdata(dev);
 103         struct usb_role_switch_desc role_sw_desc = {
 104                 .set = jz4740_musb_role_switch_set,
 105                 .driver_data = glue,
 106                 .fwnode = dev_fwnode(dev),
 107         };
 108         int err;
 109
 110         glue->musb = musb;
 111
 112         if (dev->of_node)
 113                 musb->xceiv = devm_usb_get_phy_by_phandle(dev, "phys", 0);
 114         else
 115                 musb->xceiv = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
 116         if (IS_ERR(musb->xceiv)) {
 117                 err = PTR_ERR(musb->xceiv);
 118                 if (err != -EPROBE_DEFER)
 119                         dev_err(dev, "No transceiver configured: %d", err);
 120                 return err;
 121         }
 122
 123         glue->role_sw = usb_role_switch_register(dev, &role_sw_desc);
 124         if (IS_ERR(glue->role_sw)) {
 125                 dev_err(dev, "Failed to register USB role switch");
 126                 return PTR_ERR(glue->role_sw);
 127         }
 128
 129         /*
 130          * Silicon does not implement ConfigData register.
 131          * Set dyn_fifo to avoid reading EP config from hardware.
 132          */
 133         musb->dyn_fifo = true;
 134
 135         musb->isr = jz4740_musb_interrupt;
 136
 137         return 0;
 138 }
 139
 140 static int jz4740_musb_exit(struct musb *musb)
 141 {
 142         struct jz4740_glue *glue = dev_get_drvdata(musb->controller->parent);
 143
 144         usb_role_switch_unregister(glue->role_sw);
 145
 146         return 0;
 147 }
 148
 149 static const struct musb_platform_ops jz4740_musb_ops = {
 150         .quirks         = MUSB_DMA_INVENTRA | MUSB_INDEXED_EP,
 151         .fifo_mode      = 2,
 152         .init           = jz4740_musb_init,
 153         .exit           = jz4740_musb_exit,
 154 #ifdef CONFIG_USB_INVENTRA_DMA
 155         .dma_init       = musbhs_dma_controller_create_noirq,
 156         .dma_exit       = musbhs_dma_controller_destroy,
 157 #endif
 158 };
 159
 160 static const struct musb_hdrc_platform_data jz4740_musb_pdata = {
 161         .mode           = MUSB_PERIPHERAL,
 162         .config         = &jz4740_musb_config,
 163         .platform_ops   = &jz4740_musb_ops,
 164 };
 165
 166 static struct musb_fifo_cfg jz4770_musb_fifo_cfg[] = {
 167         { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
 168         { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
 169         { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
 170         { .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, },
 171         { .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, },
 172         { .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, },
 173         { .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, },
 174         { .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, },
 175         { .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, },
 176         { .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, },
 177 };
 178
 179 static struct musb_hdrc_config jz4770_musb_config = {
 180         .multipoint     = 1,
 181         .num_eps        = 11,
 182         .ram_bits       = 11,
 183         .fifo_cfg       = jz4770_musb_fifo_cfg,
 184         .fifo_cfg_size  = ARRAY_SIZE(jz4770_musb_fifo_cfg),
 185 };
 186
 187 static const struct musb_hdrc_platform_data jz4770_musb_pdata = {
 188         .mode           = MUSB_PERIPHERAL, /* TODO: support OTG */
 189         .config         = &jz4770_musb_config,
 190         .platform_ops   = &jz4740_musb_ops,
 191 };
 192
 193 static int jz4740_probe(struct platform_device *pdev)
 194 {
 195         struct device                   *dev = &pdev->dev;
 196         const struct musb_hdrc_platform_data *pdata;
 197         struct platform_device          *musb;
 198         struct jz4740_glue              *glue;
 199         struct clk                      *clk;
 200         int                             ret;
 201
 202         glue = devm_kzalloc(dev, sizeof(*glue), GFP_KERNEL);
 203         if (!glue)
 204                 return -ENOMEM;
 205
 206         pdata = of_device_get_match_data(dev);
 207         if (!pdata) {
 208                 dev_err(dev, "missing platform data");
 209                 return -EINVAL;
 210         }
 211
 212         musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
 213         if (!musb) {
 214                 dev_err(dev, "failed to allocate musb device");
 215                 return -ENOMEM;
 216         }
 217
 218         clk = devm_clk_get(dev, "udc");
 219         if (IS_ERR(clk)) {
 220                 dev_err(dev, "failed to get clock");
 221                 ret = PTR_ERR(clk);
 222                 goto err_platform_device_put;
 223         }
 224
 225         ret = clk_prepare_enable(clk);
 226         if (ret) {
 227                 dev_err(dev, "failed to enable clock");
 228                 goto err_platform_device_put;
 229         }
 230
 231         musb->dev.parent                = dev;
 232         musb->dev.dma_mask              = &musb->dev.coherent_dma_mask;
 233         musb->dev.coherent_dma_mask     = DMA_BIT_MASK(32);
 234
 235         glue->pdev                      = musb;
 236         glue->clk                       = clk;
 237
 238         platform_set_drvdata(pdev, glue);
 239
 240         ret = platform_device_add_resources(musb, pdev->resource,
 241                                             pdev->num_resources);
 242         if (ret) {
 243                 dev_err(dev, "failed to add resources");
 244                 goto err_clk_disable;
 245         }
 246
 247         ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
 248         if (ret) {
 249                 dev_err(dev, "failed to add platform_data");
 250                 goto err_clk_disable;
 251         }
 252
 253         ret = platform_device_add(musb);
 254         if (ret) {
 255                 dev_err(dev, "failed to register musb device");
 256                 goto err_clk_disable;
 257         }
 258
 259         return 0;
 260
 261 err_clk_disable:
 262         clk_disable_unprepare(clk);
 263 err_platform_device_put:
 264         platform_device_put(musb);
 265         return ret;
 266 }
 267
 268 static int jz4740_remove(struct platform_device *pdev)
 269 {
 270         struct jz4740_glue *glue = platform_get_drvdata(pdev);
 271
 272         platform_device_unregister(glue->pdev);
 273         clk_disable_unprepare(glue->clk);
 274
 275         return 0;
 276 }
 277
 278 static const struct of_device_id jz4740_musb_of_match[] = {
 279         { .compatible = "ingenic,jz4740-musb", .data = &jz4740_musb_pdata },
 280         { .compatible = "ingenic,jz4770-musb", .data = &jz4770_musb_pdata },
 281         { /* sentinel */ },
 282 };
 283 MODULE_DEVICE_TABLE(of, jz4740_musb_of_match);
 284
 285 static struct platform_driver jz4740_driver = {
 286         .probe          = jz4740_probe,
 287         .remove         = jz4740_remove,
 288         .driver         = {
 289                 .name   = "musb-jz4740",
 290                 .of_match_table = jz4740_musb_of_match,
 291         },
 292 };
 293
 294 MODULE_DESCRIPTION("JZ4740 MUSB Glue Layer");
 295 MODULE_AUTHOR("Apelete Seketeli <apelete@seketeli.net>");
 296 MODULE_LICENSE("GPL v2");
 297 module_platform_driver(jz4740_driver);