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83d290c5 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
dbea3242 AKG |
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 | |
dbea3242 | 10 | */ |
1a459660 | 11 | |
d678a59d | 12 | #include <common.h> |
c05ed00a | 13 | #include <linux/delay.h> |
dbea3242 AKG |
14 | |
15 | #include "am35x.h" | |
16 | ||
17 | /* MUSB platform configuration */ | |
18 | struct musb_config musb_cfg = { | |
19 | .regs = (struct musb_regs *)AM35X_USB_OTG_CORE_BASE, | |
20 | .timeout = AM35X_USB_OTG_TIMEOUT, | |
21 | .musb_speed = 0, | |
22 | }; | |
23 | ||
24 | /* | |
25 | * Enable the USB phy | |
26 | */ | |
27 | static u8 phy_on(void) | |
28 | { | |
29 | u32 devconf2; | |
30 | u32 timeout; | |
31 | ||
32 | devconf2 = readl(&am35x_scm_general_regs->devconf2); | |
33 | ||
34 | devconf2 &= ~(DEVCONF2_RESET | DEVCONF2_PHYPWRDN | DEVCONF2_OTGPWRDN | | |
35 | DEVCONF2_OTGMODE | DEVCONF2_REFFREQ | | |
36 | DEVCONF2_PHY_GPIOMODE); | |
37 | devconf2 |= DEVCONF2_SESENDEN | DEVCONF2_VBDTCTEN | DEVCONF2_PHY_PLLON | | |
38 | DEVCONF2_REFFREQ_13MHZ | DEVCONF2_DATPOL; | |
39 | ||
40 | writel(devconf2, &am35x_scm_general_regs->devconf2); | |
41 | ||
42 | /* wait until the USB phy is turned on */ | |
43 | timeout = musb_cfg.timeout; | |
44 | while (timeout--) | |
45 | if (readl(&am35x_scm_general_regs->devconf2) & DEVCONF2_PHYCKGD) | |
46 | return 1; | |
47 | ||
48 | /* USB phy was not turned on */ | |
49 | return 0; | |
50 | } | |
51 | ||
52 | /* | |
53 | * Disable the USB phy | |
54 | */ | |
55 | static void phy_off(void) | |
56 | { | |
57 | u32 devconf2; | |
58 | ||
59 | /* | |
60 | * Power down the on-chip PHY. | |
61 | */ | |
62 | devconf2 = readl(&am35x_scm_general_regs->devconf2); | |
63 | ||
64 | devconf2 &= ~DEVCONF2_PHY_PLLON; | |
65 | devconf2 |= DEVCONF2_PHYPWRDN | DEVCONF2_OTGPWRDN; | |
66 | writel(devconf2, &am35x_scm_general_regs->devconf2); | |
67 | } | |
68 | ||
69 | /* | |
70 | * This function performs platform specific initialization for usb0. | |
71 | */ | |
72 | int musb_platform_init(void) | |
73 | { | |
74 | u32 revision; | |
75 | u32 sw_reset; | |
76 | ||
77 | /* global usb reset */ | |
78 | sw_reset = readl(&am35x_scm_general_regs->ip_sw_reset); | |
79 | sw_reset |= (1 << 0); | |
80 | writel(sw_reset, &am35x_scm_general_regs->ip_sw_reset); | |
81 | sw_reset &= ~(1 << 0); | |
82 | writel(sw_reset, &am35x_scm_general_regs->ip_sw_reset); | |
83 | ||
84 | /* reset the controller */ | |
85 | writel(0x1, &am35x_usb_regs->control); | |
86 | udelay(5000); | |
87 | ||
88 | /* start the on-chip usb phy and its pll */ | |
89 | if (phy_on() == 0) | |
90 | return -1; | |
91 | ||
92 | /* Returns zero if e.g. not clocked */ | |
93 | revision = readl(&am35x_usb_regs->revision); | |
94 | if (revision == 0) | |
95 | return -1; | |
96 | ||
97 | return 0; | |
98 | } | |
99 | ||
100 | /* | |
101 | * This function performs platform specific deinitialization for usb0. | |
102 | */ | |
103 | void musb_platform_deinit(void) | |
104 | { | |
105 | /* Turn off the phy */ | |
106 | phy_off(); | |
107 | } | |
5689f4b5 AKG |
108 | |
109 | /* | |
110 | * This function reads data from endpoint fifo for AM35x | |
111 | * which supports only 32bit read operation. | |
112 | * | |
113 | * ep - endpoint number | |
114 | * length - number of bytes to read from FIFO | |
115 | * fifo_data - pointer to data buffer into which data is read | |
116 | */ | |
117 | __attribute__((weak)) | |
118 | void read_fifo(u8 ep, u32 length, void *fifo_data) | |
119 | { | |
120 | u8 *data = (u8 *)fifo_data; | |
121 | u32 val; | |
122 | int i; | |
123 | ||
124 | /* select the endpoint index */ | |
125 | writeb(ep, &musbr->index); | |
126 | ||
127 | if (length > 4) { | |
128 | for (i = 0; i < (length >> 2); i++) { | |
129 | val = readl(&musbr->fifox[ep]); | |
130 | memcpy(data, &val, 4); | |
131 | data += 4; | |
132 | } | |
133 | length %= 4; | |
134 | } | |
135 | if (length > 0) { | |
136 | val = readl(&musbr->fifox[ep]); | |
137 | memcpy(data, &val, length); | |
138 | } | |
139 | } |