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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 (!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 
101 static int jz4740_musb_exit(struct musb *musb)
102 {
103         usb_put_phy(musb->xceiv);
104 
105         return 0;
106 }
107 
108 static const struct musb_platform_ops jz4740_musb_ops = {
109         .init           = jz4740_musb_init,
110         .exit           = jz4740_musb_exit,
111 };
112 
113 static int jz4740_probe(struct platform_device *pdev)
114 {
115         struct musb_hdrc_platform_data  *pdata = &jz4740_musb_platform_data;
116         struct platform_device          *musb;
117         struct jz4740_glue              *glue;
118         struct clk                      *clk;
119         int                             ret;
120 
121         glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
122         if (!glue)
123                 return -ENOMEM;
124 
125         musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
126         if (!musb) {
127                 dev_err(&pdev->dev, "failed to allocate musb device\n");
128                 return -ENOMEM;
129         }
130 
131         clk = devm_clk_get(&pdev->dev, "udc");
132         if (IS_ERR(clk)) {
133                 dev_err(&pdev->dev, "failed to get clock\n");
134                 ret = PTR_ERR(clk);
135                 goto err_platform_device_put;
136         }
137 
138         ret = clk_prepare_enable(clk);
139         if (ret) {
140                 dev_err(&pdev->dev, "failed to enable clock\n");
141                 goto err_platform_device_put;
142         }
143 
144         musb->dev.parent                = &pdev->dev;
145 
146         glue->dev                       = &pdev->dev;
147         glue->musb                      = musb;
148         glue->clk                       = clk;
149 
150         pdata->platform_ops             = &jz4740_musb_ops;
151 
152         platform_set_drvdata(pdev, glue);
153 
154         ret = platform_device_add_resources(musb, pdev->resource,
155                                             pdev->num_resources);
156         if (ret) {
157                 dev_err(&pdev->dev, "failed to add resources\n");
158                 goto err_clk_disable;
159         }
160 
161         ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
162         if (ret) {
163                 dev_err(&pdev->dev, "failed to add platform_data\n");
164                 goto err_clk_disable;
165         }
166 
167         ret = platform_device_add(musb);
168         if (ret) {
169                 dev_err(&pdev->dev, "failed to register musb device\n");
170                 goto err_clk_disable;
171         }
172 
173         return 0;
174 
175 err_clk_disable:
176         clk_disable_unprepare(clk);
177 err_platform_device_put:
178         platform_device_put(musb);
179         return ret;
180 }
181 
182 static int jz4740_remove(struct platform_device *pdev)
183 {
184         struct jz4740_glue      *glue = platform_get_drvdata(pdev);
185 
186         platform_device_unregister(glue->musb);
187         usb_phy_generic_unregister(pdev);
188         clk_disable_unprepare(glue->clk);
189 
190         return 0;
191 }
192 
193 static struct platform_driver jz4740_driver = {
194         .probe          = jz4740_probe,
195         .remove         = jz4740_remove,
196         .driver         = {
197                 .name   = "musb-jz4740",
198         },
199 };
200 
201 MODULE_DESCRIPTION("JZ4740 MUSB Glue Layer");
202 MODULE_AUTHOR("Apelete Seketeli <apelete@seketeli.net>");
203 MODULE_LICENSE("GPL v2");
204 module_platform_driver(jz4740_driver);
205 

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