Root/drivers/usb/musb/jz4740.c

Source at commit 65b33a24c1039156c0f4c0f0dbe043a41ce5a177 created 9 years 11 months ago.
By Lars-Peter Clausen, usb: musb-jz4740: Move musb_hdrc_config to the glue driver
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
25struct jz4740_glue {
26    struct device *dev;
27    struct platform_device *musb;
28    struct clk *clk;
29};
30
31static void jz4740_musb_set_vbus(struct musb *musb, int is_on)
32{
33    u8 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
34
35    /* HDRC controls CPEN, but beware current surges during device
36     * connect. They can trigger transient overcurrent conditions
37     * that must be ignored.
38     */
39
40    if (is_on) {
41        musb->is_active = 1;
42        musb->xceiv->otg->default_a = 1;
43        musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
44        devctl |= MUSB_DEVCTL_SESSION;
45
46        MUSB_HST_MODE(musb);
47    } else {
48        musb->is_active = 0;
49
50        /* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and
51         * jumping right to B_IDLE...
52         */
53
54        musb->xceiv->otg->default_a = 0;
55        musb->xceiv->state = OTG_STATE_B_IDLE;
56        devctl &= ~MUSB_DEVCTL_SESSION;
57
58        MUSB_DEV_MODE(musb);
59    }
60    musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
61
62    dev_dbg(musb->xceiv->dev, "VBUS %s, devctl %02x "
63        /* otg %3x conf %08x prcm %08x */ "\n",
64        usb_otg_state_string(musb->xceiv->state),
65        musb_readb(musb->mregs, MUSB_DEVCTL));
66}
67
68static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci)
69{
70    unsigned long flags;
71    irqreturn_t retval = IRQ_NONE;
72    struct musb *musb = __hci;
73
74    spin_lock_irqsave(&musb->lock, flags);
75
76    musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
77    musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
78    musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
79
80    if (musb->int_usb || musb->int_tx || musb->int_rx)
81        retval = musb_interrupt(musb);
82
83    spin_unlock_irqrestore(&musb->lock, flags);
84
85    return retval;
86}
87
88static struct musb_hdrc_config jz4740_musb_config = {
89    /* Silicon does not implement USB OTG. */
90    .multipoint = 0,
91    /* Max EPs scanned, driver will decide which EP can be used. */
92    .num_eps = 4,
93    /* RAMbits needed to configure EPs from table */
94    .ram_bits = 9,
95};
96
97static struct musb_hdrc_platform_data jz4740_musb_platform_data = {
98    .mode = MUSB_PERIPHERAL,
99    .config = &jz4740_musb_config,
100};
101
102static int jz4740_musb_init(struct musb *musb)
103{
104    musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
105    if (!musb->xceiv) {
106        pr_err("HS UDC: no transceiver configured\n");
107        return -ENODEV;
108    }
109
110    /* Silicon does not implement ConfigData register.
111     * Set dyn_fifo to avoid reading EP config from hardware.
112     */
113    musb->dyn_fifo = true;
114
115    musb->isr = jz4740_musb_interrupt;
116
117    return 0;
118}
119
120static int jz4740_musb_exit(struct musb *musb)
121{
122    usb_put_phy(musb->xceiv);
123
124    return 0;
125}
126
127static const struct musb_platform_ops jz4740_musb_ops = {
128    .init = jz4740_musb_init,
129    .exit = jz4740_musb_exit,
130
131    .set_vbus = jz4740_musb_set_vbus,
132};
133
134static int jz4740_probe(struct platform_device *pdev)
135{
136    struct musb_hdrc_platform_data *pdata = &jz4740_musb_platform_data;
137    struct platform_device *musb;
138    struct jz4740_glue *glue;
139    struct clk *clk;
140    int ret;
141
142    glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
143    if (!glue)
144        return -ENOMEM;
145
146    musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
147    if (!musb) {
148        dev_err(&pdev->dev, "failed to allocate musb device\n");
149        return -ENOMEM;
150    }
151
152    clk = devm_clk_get(&pdev->dev, "udc");
153    if (IS_ERR(clk)) {
154        dev_err(&pdev->dev, "failed to get clock\n");
155        ret = PTR_ERR(clk);
156        goto err_platform_device_put;
157    }
158
159    ret = clk_prepare_enable(clk);
160    if (ret) {
161        dev_err(&pdev->dev, "failed to enable clock\n");
162        goto err_platform_device_put;
163    }
164
165    musb->dev.parent = &pdev->dev;
166
167    glue->dev = &pdev->dev;
168    glue->musb = musb;
169    glue->clk = clk;
170
171    pdata->platform_ops = &jz4740_musb_ops;
172
173    platform_set_drvdata(pdev, glue);
174
175    ret = platform_device_add_resources(musb, pdev->resource,
176                        pdev->num_resources);
177    if (ret) {
178        dev_err(&pdev->dev, "failed to add resources\n");
179        goto err_clk_disable;
180    }
181
182    ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
183    if (ret) {
184        dev_err(&pdev->dev, "failed to add platform_data\n");
185        goto err_clk_disable;
186    }
187
188    ret = platform_device_add(musb);
189    if (ret) {
190        dev_err(&pdev->dev, "failed to register musb device\n");
191        goto err_clk_disable;
192    }
193
194    return 0;
195
196err_clk_disable:
197    clk_disable_unprepare(clk);
198err_platform_device_put:
199    platform_device_put(musb);
200    return ret;
201}
202
203static int jz4740_remove(struct platform_device *pdev)
204{
205    struct jz4740_glue *glue = platform_get_drvdata(pdev);
206
207    platform_device_unregister(glue->musb);
208    clk_disable_unprepare(glue->clk);
209
210    return 0;
211}
212
213static struct platform_driver jz4740_driver = {
214    .probe = jz4740_probe,
215    .remove = jz4740_remove,
216    .driver = {
217        .name = "musb-jz4740",
218    },
219};
220
221MODULE_DESCRIPTION("JZ4740 MUSB Glue Layer");
222MODULE_AUTHOR("Apelete Seketeli <apelete@seketeli.net>");
223MODULE_LICENSE("GPL v2");
224module_platform_driver(jz4740_driver);
225

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