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

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