1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * am35x.c - TI's AM35x platform specific usb wrapper functions.
4 *
5 * Author: Ajay Kumar Gupta <ajay.gupta@ti.com>
6 *
7 * Based on drivers/usb/musb/da8xx.c
8 *
9 * Copyright (c) 2010 Texas Instruments Incorporated
10 */
11
12 #include <common.h>
13
14 #include "am35x.h"
15
16 /* MUSB platform configuration */
17 struct musb_config musb_cfg = {
18 .regs = (struct musb_regs *)AM35X_USB_OTG_CORE_BASE,
19 .timeout = AM35X_USB_OTG_TIMEOUT,
20 .musb_speed = 0,
21 };
22
23 /*
24 * Enable the USB phy
25 */
phy_on(void)26 static u8 phy_on(void)
27 {
28 u32 devconf2;
29 u32 timeout;
30
31 devconf2 = readl(&am35x_scm_general_regs->devconf2);
32
33 devconf2 &= ~(DEVCONF2_RESET | DEVCONF2_PHYPWRDN | DEVCONF2_OTGPWRDN |
34 DEVCONF2_OTGMODE | DEVCONF2_REFFREQ |
35 DEVCONF2_PHY_GPIOMODE);
36 devconf2 |= DEVCONF2_SESENDEN | DEVCONF2_VBDTCTEN | DEVCONF2_PHY_PLLON |
37 DEVCONF2_REFFREQ_13MHZ | DEVCONF2_DATPOL;
38
39 writel(devconf2, &am35x_scm_general_regs->devconf2);
40
41 /* wait until the USB phy is turned on */
42 timeout = musb_cfg.timeout;
43 while (timeout--)
44 if (readl(&am35x_scm_general_regs->devconf2) & DEVCONF2_PHYCKGD)
45 return 1;
46
47 /* USB phy was not turned on */
48 return 0;
49 }
50
51 /*
52 * Disable the USB phy
53 */
phy_off(void)54 static void phy_off(void)
55 {
56 u32 devconf2;
57
58 /*
59 * Power down the on-chip PHY.
60 */
61 devconf2 = readl(&am35x_scm_general_regs->devconf2);
62
63 devconf2 &= ~DEVCONF2_PHY_PLLON;
64 devconf2 |= DEVCONF2_PHYPWRDN | DEVCONF2_OTGPWRDN;
65 writel(devconf2, &am35x_scm_general_regs->devconf2);
66 }
67
68 /*
69 * This function performs platform specific initialization for usb0.
70 */
musb_platform_init(void)71 int musb_platform_init(void)
72 {
73 u32 revision;
74 u32 sw_reset;
75
76 /* global usb reset */
77 sw_reset = readl(&am35x_scm_general_regs->ip_sw_reset);
78 sw_reset |= (1 << 0);
79 writel(sw_reset, &am35x_scm_general_regs->ip_sw_reset);
80 sw_reset &= ~(1 << 0);
81 writel(sw_reset, &am35x_scm_general_regs->ip_sw_reset);
82
83 /* reset the controller */
84 writel(0x1, &am35x_usb_regs->control);
85 udelay(5000);
86
87 /* start the on-chip usb phy and its pll */
88 if (phy_on() == 0)
89 return -1;
90
91 /* Returns zero if e.g. not clocked */
92 revision = readl(&am35x_usb_regs->revision);
93 if (revision == 0)
94 return -1;
95
96 return 0;
97 }
98
99 /*
100 * This function performs platform specific deinitialization for usb0.
101 */
musb_platform_deinit(void)102 void musb_platform_deinit(void)
103 {
104 /* Turn off the phy */
105 phy_off();
106 }
107
108 /*
109 * This function reads data from endpoint fifo for AM35x
110 * which supports only 32bit read operation.
111 *
112 * ep - endpoint number
113 * length - number of bytes to read from FIFO
114 * fifo_data - pointer to data buffer into which data is read
115 */
116 __attribute__((weak))
read_fifo(u8 ep,u32 length,void * fifo_data)117 void read_fifo(u8 ep, u32 length, void *fifo_data)
118 {
119 u8 *data = (u8 *)fifo_data;
120 u32 val;
121 int i;
122
123 /* select the endpoint index */
124 writeb(ep, &musbr->index);
125
126 if (length > 4) {
127 for (i = 0; i < (length >> 2); i++) {
128 val = readl(&musbr->fifox[ep]);
129 memcpy(data, &val, 4);
130 data += 4;
131 }
132 length %= 4;
133 }
134 if (length > 0) {
135 val = readl(&musbr->fifox[ep]);
136 memcpy(data, &val, length);
137 }
138 }
139