1 /*
2 * Copyright 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
3 * Copyright 2009 Daniel Mack <daniel@caiaq.de>
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
17 * MA 02110-1301, USA.
18 */
19
20 #include <linux/module.h>
21 #include <linux/kernel.h>
22 #include <linux/io.h>
23 #include <linux/delay.h>
24 #include <linux/usb/otg.h>
25 #include <linux/usb/ulpi.h>
26
27 #include <mach/ulpi.h>
28
29 /* ULPIVIEW register bits */
30 #define ULPIVW_WU (1 << 31) /* Wakeup */
31 #define ULPIVW_RUN (1 << 30) /* read/write run */
32 #define ULPIVW_WRITE (1 << 29) /* 0 = read 1 = write */
33 #define ULPIVW_SS (1 << 27) /* SyncState */
34 #define ULPIVW_PORT_MASK 0x07 /* Port field */
35 #define ULPIVW_PORT_SHIFT 24
36 #define ULPIVW_ADDR_MASK 0xff /* data address field */
37 #define ULPIVW_ADDR_SHIFT 16
38 #define ULPIVW_RDATA_MASK 0xff /* read data field */
39 #define ULPIVW_RDATA_SHIFT 8
40 #define ULPIVW_WDATA_MASK 0xff /* write data field */
41 #define ULPIVW_WDATA_SHIFT 0
42
ulpi_poll(void __iomem * view,u32 bit)43 static int ulpi_poll(void __iomem *view, u32 bit)
44 {
45 int timeout = 10000;
46
47 while (timeout--) {
48 u32 data = __raw_readl(view);
49
50 if (!(data & bit))
51 return 0;
52
53 cpu_relax();
54 };
55
56 printk(KERN_WARNING "timeout polling for ULPI device\n");
57
58 return -ETIMEDOUT;
59 }
60
ulpi_read(struct usb_phy * otg,u32 reg)61 static int ulpi_read(struct usb_phy *otg, u32 reg)
62 {
63 int ret;
64 void __iomem *view = otg->io_priv;
65
66 /* make sure interface is running */
67 if (!(__raw_readl(view) & ULPIVW_SS)) {
68 __raw_writel(ULPIVW_WU, view);
69
70 /* wait for wakeup */
71 ret = ulpi_poll(view, ULPIVW_WU);
72 if (ret)
73 return ret;
74 }
75
76 /* read the register */
77 __raw_writel((ULPIVW_RUN | (reg << ULPIVW_ADDR_SHIFT)), view);
78
79 /* wait for completion */
80 ret = ulpi_poll(view, ULPIVW_RUN);
81 if (ret)
82 return ret;
83
84 return (__raw_readl(view) >> ULPIVW_RDATA_SHIFT) & ULPIVW_RDATA_MASK;
85 }
86
ulpi_write(struct usb_phy * otg,u32 val,u32 reg)87 static int ulpi_write(struct usb_phy *otg, u32 val, u32 reg)
88 {
89 int ret;
90 void __iomem *view = otg->io_priv;
91
92 /* make sure the interface is running */
93 if (!(__raw_readl(view) & ULPIVW_SS)) {
94 __raw_writel(ULPIVW_WU, view);
95 /* wait for wakeup */
96 ret = ulpi_poll(view, ULPIVW_WU);
97 if (ret)
98 return ret;
99 }
100
101 __raw_writel((ULPIVW_RUN | ULPIVW_WRITE |
102 (reg << ULPIVW_ADDR_SHIFT) |
103 ((val & ULPIVW_WDATA_MASK) << ULPIVW_WDATA_SHIFT)), view);
104
105 /* wait for completion */
106 return ulpi_poll(view, ULPIVW_RUN);
107 }
108
109 struct usb_phy_io_ops mxc_ulpi_access_ops = {
110 .read = ulpi_read,
111 .write = ulpi_write,
112 };
113 EXPORT_SYMBOL_GPL(mxc_ulpi_access_ops);
114
imx_otg_ulpi_create(unsigned int flags)115 struct usb_phy *imx_otg_ulpi_create(unsigned int flags)
116 {
117 return otg_ulpi_create(&mxc_ulpi_access_ops, flags);
118 }
119