2 * Ingenic JZ4740 "glue layer"
4 * Copyright (C) 2013, Apelete Seketeli <apelete@seketeli.net>
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.
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.
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>
24 #include "musb_core.h"
28 struct platform_device *musb;
32 static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci)
35 irqreturn_t retval = IRQ_NONE;
36 struct musb *musb = __hci;
38 spin_lock_irqsave(&musb->lock, flags);
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);
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
49 musb->int_usb &= MUSB_INTR_SUSPEND | MUSB_INTR_RESUME |
50 MUSB_INTR_RESET | MUSB_INTR_SOF;
52 if (musb->int_usb || musb->int_tx || musb->int_rx)
53 retval = musb_interrupt(musb);
55 spin_unlock_irqrestore(&musb->lock, flags);
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, },
66 static struct musb_hdrc_config jz4740_musb_config = {
67 /* Silicon does not implement USB OTG. */
69 /* Max EPs scanned, driver will decide which EP can be used. */
71 /* RAMbits needed to configure EPs from table */
73 .fifo_cfg = jz4740_musb_fifo_cfg,
74 .fifo_cfg_size = ARRAY_SIZE(jz4740_musb_fifo_cfg),
77 static struct musb_hdrc_platform_data jz4740_musb_platform_data = {
78 .mode = MUSB_PERIPHERAL,
79 .config = &jz4740_musb_config,
82 static int jz4740_musb_init(struct musb *musb)
84 usb_phy_generic_register();
85 musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
87 pr_err("HS UDC: no transceiver configured\n");
91 /* Silicon does not implement ConfigData register.
92 * Set dyn_fifo to avoid reading EP config from hardware.
94 musb->dyn_fifo = true;
96 musb->isr = jz4740_musb_interrupt;
101 static int jz4740_musb_exit(struct musb *musb)
103 usb_put_phy(musb->xceiv);
108 static const struct musb_platform_ops jz4740_musb_ops = {
109 .init = jz4740_musb_init,
110 .exit = jz4740_musb_exit,
113 static int jz4740_probe(struct platform_device *pdev)
115 struct musb_hdrc_platform_data *pdata = &jz4740_musb_platform_data;
116 struct platform_device *musb;
117 struct jz4740_glue *glue;
121 glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
125 musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
127 dev_err(&pdev->dev, "failed to allocate musb device\n");
131 clk = devm_clk_get(&pdev->dev, "udc");
133 dev_err(&pdev->dev, "failed to get clock\n");
135 goto err_platform_device_put;
138 ret = clk_prepare_enable(clk);
140 dev_err(&pdev->dev, "failed to enable clock\n");
141 goto err_platform_device_put;
144 musb->dev.parent = &pdev->dev;
146 glue->dev = &pdev->dev;
150 pdata->platform_ops = &jz4740_musb_ops;
152 platform_set_drvdata(pdev, glue);
154 ret = platform_device_add_resources(musb, pdev->resource,
155 pdev->num_resources);
157 dev_err(&pdev->dev, "failed to add resources\n");
158 goto err_clk_disable;
161 ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
163 dev_err(&pdev->dev, "failed to add platform_data\n");
164 goto err_clk_disable;
167 ret = platform_device_add(musb);
169 dev_err(&pdev->dev, "failed to register musb device\n");
170 goto err_clk_disable;
176 clk_disable_unprepare(clk);
177 err_platform_device_put:
178 platform_device_put(musb);
182 static int jz4740_remove(struct platform_device *pdev)
184 struct jz4740_glue *glue = platform_get_drvdata(pdev);
186 platform_device_unregister(glue->musb);
187 usb_phy_generic_unregister(pdev);
188 clk_disable_unprepare(glue->clk);
193 static struct platform_driver jz4740_driver = {
194 .probe = jz4740_probe,
195 .remove = jz4740_remove,
197 .name = "musb-jz4740",
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);