1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
|
// SPDX-License-Identifier: GPL-2.0
/*
* driver for NXP USB Host devices
*
* Currently supported OHCI host devices:
* - NXP LPC32xx
*
* Authors: Dmitry Chigirev <source@mvista.com>
* Vitaly Wool <vitalywool@gmail.com>
*
* register initialization is based on code examples provided by Philips
* Copyright (c) 2005 Koninklijke Philips Electronics N.V.
*
* NOTE: This driver does not have suspend/resume functionality
* This driver is intended for engineering development purposes only
*
* 2005-2006 (c) MontaVista Software, Inc.
*/
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/usb/isp1301.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include "ohci.h"
#define USB_CONFIG_BASE 0x31020000
/* USB_OTG_STAT_CONTROL bit defines */
#define TRANSPARENT_I2C_EN (1 << 7)
#define HOST_EN (1 << 0)
/* On LPC32xx, those are undefined */
#ifndef start_int_set_falling_edge
#define start_int_set_falling_edge(irq)
#define start_int_set_rising_edge(irq)
#define start_int_ack(irq)
#define start_int_mask(irq)
#define start_int_umask(irq)
#endif
#define DRIVER_DESC "OHCI NXP driver"
static const char hcd_name[] = "ohci-nxp";
static struct hc_driver __read_mostly ohci_nxp_hc_driver;
static struct i2c_client *isp1301_i2c_client;
static struct clk *usb_host_clk;
static void isp1301_configure_lpc32xx(void)
{
/* LPC32XX only supports DAT_SE0 USB mode */
/* This sequence is important */
/* Disable transparent UART mode first */
i2c_smbus_write_byte_data(isp1301_i2c_client,
(ISP1301_I2C_MODE_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR),
MC1_UART_EN);
i2c_smbus_write_byte_data(isp1301_i2c_client,
(ISP1301_I2C_MODE_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR),
~MC1_SPEED_REG);
i2c_smbus_write_byte_data(isp1301_i2c_client,
ISP1301_I2C_MODE_CONTROL_1, MC1_SPEED_REG);
i2c_smbus_write_byte_data(isp1301_i2c_client,
(ISP1301_I2C_MODE_CONTROL_2 | ISP1301_I2C_REG_CLEAR_ADDR),
~0);
i2c_smbus_write_byte_data(isp1301_i2c_client,
ISP1301_I2C_MODE_CONTROL_2,
(MC2_BI_DI | MC2_PSW_EN | MC2_SPD_SUSP_CTRL));
i2c_smbus_write_byte_data(isp1301_i2c_client,
(ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR), ~0);
i2c_smbus_write_byte_data(isp1301_i2c_client,
ISP1301_I2C_MODE_CONTROL_1, MC1_DAT_SE0);
i2c_smbus_write_byte_data(isp1301_i2c_client,
ISP1301_I2C_OTG_CONTROL_1,
(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
i2c_smbus_write_byte_data(isp1301_i2c_client,
(ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR),
(OTG1_DM_PULLUP | OTG1_DP_PULLUP));
i2c_smbus_write_byte_data(isp1301_i2c_client,
ISP1301_I2C_INTERRUPT_LATCH | ISP1301_I2C_REG_CLEAR_ADDR, ~0);
i2c_smbus_write_byte_data(isp1301_i2c_client,
ISP1301_I2C_INTERRUPT_FALLING | ISP1301_I2C_REG_CLEAR_ADDR,
~0);
i2c_smbus_write_byte_data(isp1301_i2c_client,
ISP1301_I2C_INTERRUPT_RISING | ISP1301_I2C_REG_CLEAR_ADDR, ~0);
printk(KERN_INFO "ISP1301 Vendor ID : 0x%04x\n",
i2c_smbus_read_word_data(isp1301_i2c_client, 0x00));
printk(KERN_INFO "ISP1301 Product ID : 0x%04x\n",
i2c_smbus_read_word_data(isp1301_i2c_client, 0x02));
printk(KERN_INFO "ISP1301 Version ID : 0x%04x\n",
i2c_smbus_read_word_data(isp1301_i2c_client, 0x14));
}
static void isp1301_configure(void)
{
isp1301_configure_lpc32xx();
}
static inline void isp1301_vbus_on(void)
{
i2c_smbus_write_byte_data(isp1301_i2c_client, ISP1301_I2C_OTG_CONTROL_1,
OTG1_VBUS_DRV);
}
static inline void isp1301_vbus_off(void)
{
i2c_smbus_write_byte_data(isp1301_i2c_client,
ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR,
OTG1_VBUS_DRV);
}
static void ohci_nxp_start_hc(void)
{
void __iomem *usb_otg_stat_control = ioremap(USB_CONFIG_BASE + 0x110, 4);
unsigned long tmp;
if (WARN_ON(!usb_otg_stat_control))
return;
tmp = __raw_readl(usb_otg_stat_control) | HOST_EN;
__raw_writel(tmp, usb_otg_stat_control);
isp1301_vbus_on();
iounmap(usb_otg_stat_control);
}
static void ohci_nxp_stop_hc(void)
{
void __iomem *usb_otg_stat_control = ioremap(USB_CONFIG_BASE + 0x110, 4);
unsigned long tmp;
if (WARN_ON(!usb_otg_stat_control))
return;
isp1301_vbus_off();
tmp = __raw_readl(usb_otg_stat_control) & ~HOST_EN;
__raw_writel(tmp, usb_otg_stat_control);
iounmap(usb_otg_stat_control);
}
static int ohci_hcd_nxp_probe(struct platform_device *pdev)
{
struct usb_hcd *hcd = NULL;
const struct hc_driver *driver = &ohci_nxp_hc_driver;
struct resource *res;
int ret = 0, irq;
struct device_node *isp1301_node;
if (pdev->dev.of_node) {
isp1301_node = of_parse_phandle(pdev->dev.of_node,
"transceiver", 0);
} else {
isp1301_node = NULL;
}
isp1301_i2c_client = isp1301_get_client(isp1301_node);
if (!isp1301_i2c_client)
return -EPROBE_DEFER;
ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
if (ret)
goto fail_disable;
dev_dbg(&pdev->dev, "%s: " DRIVER_DESC " (nxp)\n", hcd_name);
if (usb_disabled()) {
dev_err(&pdev->dev, "USB is disabled\n");
ret = -ENODEV;
goto fail_disable;
}
/* Enable USB host clock */
usb_host_clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(usb_host_clk)) {
dev_err(&pdev->dev, "failed to acquire USB OHCI clock\n");
ret = PTR_ERR(usb_host_clk);
goto fail_disable;
}
ret = clk_prepare_enable(usb_host_clk);
if (ret < 0) {
dev_err(&pdev->dev, "failed to start USB OHCI clock\n");
goto fail_disable;
}
isp1301_configure();
hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
if (!hcd) {
dev_err(&pdev->dev, "Failed to allocate HC buffer\n");
ret = -ENOMEM;
goto fail_hcd;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
hcd->regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(hcd->regs)) {
ret = PTR_ERR(hcd->regs);
goto fail_resource;
}
hcd->rsrc_start = res->start;
hcd->rsrc_len = resource_size(res);
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
ret = -ENXIO;
goto fail_resource;
}
ohci_nxp_start_hc();
platform_set_drvdata(pdev, hcd);
dev_info(&pdev->dev, "at 0x%p, irq %d\n", hcd->regs, hcd->irq);
ret = usb_add_hcd(hcd, irq, 0);
if (ret == 0) {
device_wakeup_enable(hcd->self.controller);
return ret;
}
ohci_nxp_stop_hc();
fail_resource:
usb_put_hcd(hcd);
fail_hcd:
clk_disable_unprepare(usb_host_clk);
fail_disable:
isp1301_i2c_client = NULL;
return ret;
}
static int ohci_hcd_nxp_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
usb_remove_hcd(hcd);
ohci_nxp_stop_hc();
usb_put_hcd(hcd);
clk_disable_unprepare(usb_host_clk);
isp1301_i2c_client = NULL;
return 0;
}
/* work with hotplug and coldplug */
MODULE_ALIAS("platform:usb-ohci");
#ifdef CONFIG_OF
static const struct of_device_id ohci_hcd_nxp_match[] = {
{ .compatible = "nxp,ohci-nxp" },
{},
};
MODULE_DEVICE_TABLE(of, ohci_hcd_nxp_match);
#endif
static struct platform_driver ohci_hcd_nxp_driver = {
.driver = {
.name = "usb-ohci",
.of_match_table = of_match_ptr(ohci_hcd_nxp_match),
},
.probe = ohci_hcd_nxp_probe,
.remove = ohci_hcd_nxp_remove,
};
static int __init ohci_nxp_init(void)
{
if (usb_disabled())
return -ENODEV;
pr_info("%s: " DRIVER_DESC "\n", hcd_name);
ohci_init_driver(&ohci_nxp_hc_driver, NULL);
return platform_driver_register(&ohci_hcd_nxp_driver);
}
module_init(ohci_nxp_init);
static void __exit ohci_nxp_cleanup(void)
{
platform_driver_unregister(&ohci_hcd_nxp_driver);
}
module_exit(ohci_nxp_cleanup);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL v2");
|
