1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * TI's Davinci platform specific USB wrapper functions.
4 *
5 * Copyright (c) 2008 Texas Instruments
6 *
7 * Author: Thomas Abraham t-abraham@ti.com, Texas Instruments
8 */
9
10 #include <common.h>
11 #include <asm/io.h>
12 #include "davinci.h"
13 #include <asm/arch/hardware.h>
14
15 #if !defined(CONFIG_DV_USBPHY_CTL)
16 #define CONFIG_DV_USBPHY_CTL (USBPHY_SESNDEN | USBPHY_VBDTCTEN)
17 #endif
18
19 /* MUSB platform configuration */
20 struct musb_config musb_cfg = {
21 .regs = (struct musb_regs *)MENTOR_USB0_BASE,
22 .timeout = DAVINCI_USB_TIMEOUT,
23 .musb_speed = 0,
24 };
25
26 /* MUSB module register overlay */
27 struct davinci_usb_regs *dregs;
28
29 /*
30 * Enable the USB phy
31 */
phy_on(void)32 static u8 phy_on(void)
33 {
34 u32 timeout;
35 #ifdef DAVINCI_DM365EVM
36 u32 val;
37 #endif
38 /* Wait until the USB phy is turned on */
39 #ifdef DAVINCI_DM365EVM
40 writel(USBPHY_PHY24MHZ | USBPHY_SESNDEN |
41 USBPHY_VBDTCTEN, USBPHY_CTL_PADDR);
42 #else
43 writel(CONFIG_DV_USBPHY_CTL, USBPHY_CTL_PADDR);
44 #endif
45 timeout = musb_cfg.timeout;
46
47 #ifdef DAVINCI_DM365EVM
48 /* Set the ownership of GIO33 to USB */
49 val = readl(PINMUX4);
50 val &= ~(PINMUX4_USBDRVBUS_BITCLEAR);
51 val |= PINMUX4_USBDRVBUS_BITSET;
52 writel(val, PINMUX4);
53 #endif
54 while (timeout--)
55 if (readl(USBPHY_CTL_PADDR) & USBPHY_PHYCLKGD)
56 return 1;
57
58 /* USB phy was not turned on */
59 return 0;
60 }
61
62 /*
63 * Disable the USB phy
64 */
phy_off(void)65 static void phy_off(void)
66 {
67 /* powerdown the on-chip PHY and its oscillator */
68 writel(USBPHY_OSCPDWN | USBPHY_PHYPDWN, USBPHY_CTL_PADDR);
69 }
70
__enable_vbus(void)71 void __enable_vbus(void)
72 {
73 /*
74 * nothing to do, vbus is handled through the cpu.
75 * Define this function in board code, if it is
76 * different on your board.
77 */
78 }
79 void enable_vbus(void)
80 __attribute__((weak, alias("__enable_vbus")));
81
82 /*
83 * This function performs Davinci platform specific initialization for usb0.
84 */
musb_platform_init(void)85 int musb_platform_init(void)
86 {
87 u32 revision;
88
89 /* enable USB VBUS */
90 enable_vbus();
91
92 /* start the on-chip USB phy and its pll */
93 if (!phy_on())
94 return -1;
95
96 /* reset the controller */
97 dregs = (struct davinci_usb_regs *)DAVINCI_USB0_BASE;
98 writel(1, &dregs->ctrlr);
99 udelay(5000);
100
101 /* Returns zero if e.g. not clocked */
102 revision = readl(&dregs->version);
103 if (!revision)
104 return -1;
105
106 /* Disable all interrupts */
107 writel(DAVINCI_USB_USBINT_MASK | DAVINCI_USB_RXINT_MASK |
108 DAVINCI_USB_TXINT_MASK , &dregs->intmsksetr);
109 return 0;
110 }
111
112 /*
113 * This function performs Davinci platform specific deinitialization for usb0.
114 */
musb_platform_deinit(void)115 void musb_platform_deinit(void)
116 {
117 /* Turn of the phy */
118 phy_off();
119
120 /* flush any interrupts */
121 writel(DAVINCI_USB_USBINT_MASK | DAVINCI_USB_TXINT_MASK |
122 DAVINCI_USB_RXINT_MASK , &dregs->intclrr);
123 }
124