Version:  2.0.40 2.2.26 2.4.37 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8

Linux/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);
211 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us