1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright (C) 2011 Jana Rapava <fermata7@gmail.com>
3*4882a593Smuzhiyun * Copyright (C) 2011 CompuLab, Ltd. <www.compulab.co.il>
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Authors: Jana Rapava <fermata7@gmail.com>
6*4882a593Smuzhiyun * Igor Grinberg <grinberg@compulab.co.il>
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * Based on:
9*4882a593Smuzhiyun * linux/drivers/usb/otg/ulpi_viewport.c
10*4882a593Smuzhiyun *
11*4882a593Smuzhiyun * Original Copyright follow:
12*4882a593Smuzhiyun * Copyright (C) 2011 Google, Inc.
13*4882a593Smuzhiyun *
14*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0
15*4882a593Smuzhiyun */
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun #include <common.h>
18*4882a593Smuzhiyun #include <asm/io.h>
19*4882a593Smuzhiyun #include <usb/ulpi.h>
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun /* ULPI viewport control bits */
22*4882a593Smuzhiyun #define ULPI_SS (1 << 27)
23*4882a593Smuzhiyun #define ULPI_RWCTRL (1 << 29)
24*4882a593Smuzhiyun #define ULPI_RWRUN (1 << 30)
25*4882a593Smuzhiyun #define ULPI_WU (1 << 31)
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun /*
28*4882a593Smuzhiyun * Wait for the ULPI request to complete
29*4882a593Smuzhiyun *
30*4882a593Smuzhiyun * @ulpi_viewport - the address of the viewport
31*4882a593Smuzhiyun * @mask - expected value to wait for
32*4882a593Smuzhiyun *
33*4882a593Smuzhiyun * returns 0 on mask match, ULPI_ERROR on time out.
34*4882a593Smuzhiyun */
ulpi_wait(struct ulpi_viewport * ulpi_vp,u32 mask)35*4882a593Smuzhiyun static int ulpi_wait(struct ulpi_viewport *ulpi_vp, u32 mask)
36*4882a593Smuzhiyun {
37*4882a593Smuzhiyun int timeout = CONFIG_USB_ULPI_TIMEOUT;
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun /* Wait for the bits in mask to become zero. */
40*4882a593Smuzhiyun while (--timeout) {
41*4882a593Smuzhiyun if ((readl(ulpi_vp->viewport_addr) & mask) == 0)
42*4882a593Smuzhiyun return 0;
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun udelay(1);
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun return ULPI_ERROR;
48*4882a593Smuzhiyun }
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun /*
51*4882a593Smuzhiyun * Wake the ULPI PHY up for communication
52*4882a593Smuzhiyun *
53*4882a593Smuzhiyun * returns 0 on success.
54*4882a593Smuzhiyun */
ulpi_wakeup(struct ulpi_viewport * ulpi_vp)55*4882a593Smuzhiyun static int ulpi_wakeup(struct ulpi_viewport *ulpi_vp)
56*4882a593Smuzhiyun {
57*4882a593Smuzhiyun int err;
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun if (readl(ulpi_vp->viewport_addr) & ULPI_SS)
60*4882a593Smuzhiyun return 0; /* already awake */
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun writel(ULPI_WU, ulpi_vp->viewport_addr);
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun err = ulpi_wait(ulpi_vp, ULPI_WU);
65*4882a593Smuzhiyun if (err)
66*4882a593Smuzhiyun printf("ULPI wakeup timed out\n");
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun return err;
69*4882a593Smuzhiyun }
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun /*
72*4882a593Smuzhiyun * Issue a ULPI read/write request
73*4882a593Smuzhiyun *
74*4882a593Smuzhiyun * @value - the ULPI request
75*4882a593Smuzhiyun */
ulpi_request(struct ulpi_viewport * ulpi_vp,u32 value)76*4882a593Smuzhiyun static int ulpi_request(struct ulpi_viewport *ulpi_vp, u32 value)
77*4882a593Smuzhiyun {
78*4882a593Smuzhiyun int err;
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun err = ulpi_wakeup(ulpi_vp);
81*4882a593Smuzhiyun if (err)
82*4882a593Smuzhiyun return err;
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun writel(value, ulpi_vp->viewport_addr);
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun err = ulpi_wait(ulpi_vp, ULPI_RWRUN);
87*4882a593Smuzhiyun if (err)
88*4882a593Smuzhiyun printf("ULPI request timed out\n");
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun return err;
91*4882a593Smuzhiyun }
92*4882a593Smuzhiyun
ulpi_write(struct ulpi_viewport * ulpi_vp,u8 * reg,u32 value)93*4882a593Smuzhiyun int ulpi_write(struct ulpi_viewport *ulpi_vp, u8 *reg, u32 value)
94*4882a593Smuzhiyun {
95*4882a593Smuzhiyun u32 addr = (uintptr_t)reg & 0xFF;
96*4882a593Smuzhiyun u32 val = ULPI_RWRUN | ULPI_RWCTRL | addr << 16 | (value & 0xff);
97*4882a593Smuzhiyun
98*4882a593Smuzhiyun val |= (ulpi_vp->port_num & 0x7) << 24;
99*4882a593Smuzhiyun return ulpi_request(ulpi_vp, val);
100*4882a593Smuzhiyun }
101*4882a593Smuzhiyun
ulpi_read(struct ulpi_viewport * ulpi_vp,u8 * reg)102*4882a593Smuzhiyun u32 ulpi_read(struct ulpi_viewport *ulpi_vp, u8 *reg)
103*4882a593Smuzhiyun {
104*4882a593Smuzhiyun int err;
105*4882a593Smuzhiyun u32 val = ULPI_RWRUN | ((uintptr_t)reg & 0xFF) << 16;
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun val |= (ulpi_vp->port_num & 0x7) << 24;
108*4882a593Smuzhiyun err = ulpi_request(ulpi_vp, val);
109*4882a593Smuzhiyun if (err)
110*4882a593Smuzhiyun return err;
111*4882a593Smuzhiyun
112*4882a593Smuzhiyun return (readl(ulpi_vp->viewport_addr) >> 8) & 0xff;
113*4882a593Smuzhiyun }
114