1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2011 Jana Rapava <fermata7@gmail.com>
4 * Copyright (C) 2011 CompuLab, Ltd. <www.compulab.co.il>
5 *
6 * Authors: Jana Rapava <fermata7@gmail.com>
7 * Igor Grinberg <grinberg@compulab.co.il>
8 *
9 * Based on:
10 * linux/drivers/usb/otg/ulpi_viewport.c
11 *
12 * Original Copyright follow:
13 * Copyright (C) 2011 Google, Inc.
14 */
15
16 #include <common.h>
17 #include <asm/io.h>
18 #include <usb/ulpi.h>
19
20 /* ULPI viewport control bits */
21 #define ULPI_SS (1 << 27)
22 #define ULPI_RWCTRL (1 << 29)
23 #define ULPI_RWRUN (1 << 30)
24 #define ULPI_WU (1 << 31)
25
26 /*
27 * Wait for the ULPI request to complete
28 *
29 * @ulpi_viewport - the address of the viewport
30 * @mask - expected value to wait for
31 *
32 * returns 0 on mask match, ULPI_ERROR on time out.
33 */
ulpi_wait(struct ulpi_viewport * ulpi_vp,u32 mask)34 static int ulpi_wait(struct ulpi_viewport *ulpi_vp, u32 mask)
35 {
36 int timeout = CONFIG_USB_ULPI_TIMEOUT;
37
38 /* Wait for the bits in mask to become zero. */
39 while (--timeout) {
40 if ((readl(ulpi_vp->viewport_addr) & mask) == 0)
41 return 0;
42
43 udelay(1);
44 }
45
46 return ULPI_ERROR;
47 }
48
49 /*
50 * Wake the ULPI PHY up for communication
51 *
52 * returns 0 on success.
53 */
ulpi_wakeup(struct ulpi_viewport * ulpi_vp)54 static int ulpi_wakeup(struct ulpi_viewport *ulpi_vp)
55 {
56 int err;
57
58 if (readl(ulpi_vp->viewport_addr) & ULPI_SS)
59 return 0; /* already awake */
60
61 writel(ULPI_WU, ulpi_vp->viewport_addr);
62
63 err = ulpi_wait(ulpi_vp, ULPI_WU);
64 if (err)
65 printf("ULPI wakeup timed out\n");
66
67 return err;
68 }
69
70 /*
71 * Issue a ULPI read/write request
72 *
73 * @value - the ULPI request
74 */
ulpi_request(struct ulpi_viewport * ulpi_vp,u32 value)75 static int ulpi_request(struct ulpi_viewport *ulpi_vp, u32 value)
76 {
77 int err;
78
79 err = ulpi_wakeup(ulpi_vp);
80 if (err)
81 return err;
82
83 writel(value, ulpi_vp->viewport_addr);
84
85 err = ulpi_wait(ulpi_vp, ULPI_RWRUN);
86 if (err)
87 printf("ULPI request timed out\n");
88
89 return err;
90 }
91
ulpi_write(struct ulpi_viewport * ulpi_vp,u8 * reg,u32 value)92 int ulpi_write(struct ulpi_viewport *ulpi_vp, u8 *reg, u32 value)
93 {
94 u32 addr = (uintptr_t)reg & 0xFF;
95 u32 val = ULPI_RWRUN | ULPI_RWCTRL | addr << 16 | (value & 0xff);
96
97 val |= (ulpi_vp->port_num & 0x7) << 24;
98 return ulpi_request(ulpi_vp, val);
99 }
100
ulpi_read(struct ulpi_viewport * ulpi_vp,u8 * reg)101 u32 ulpi_read(struct ulpi_viewport *ulpi_vp, u8 *reg)
102 {
103 int err;
104 u32 val = ULPI_RWRUN | ((uintptr_t)reg & 0xFF) << 16;
105
106 val |= (ulpi_vp->port_num & 0x7) << 24;
107 err = ulpi_request(ulpi_vp, val);
108 if (err)
109 return err;
110
111 return (readl(ulpi_vp->viewport_addr) >> 8) & 0xff;
112 }
113