2 * am35x.c - TI's AM35x platform specific usb wrapper functions.
4 * Author: Ajay Kumar Gupta <ajay.gupta@ti.com>
6 * Based on drivers/usb/musb/da8xx.c
8 * Copyright (c) 2010 Texas Instruments Incorporated
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 /* MUSB platform configuration */
29 struct musb_config musb_cfg = {
30 .regs = (struct musb_regs *)AM35X_USB_OTG_CORE_BASE,
31 .timeout = AM35X_USB_OTG_TIMEOUT,
38 static u8 phy_on(void)
43 devconf2 = readl(&am35x_scm_general_regs->devconf2);
45 devconf2 &= ~(DEVCONF2_RESET | DEVCONF2_PHYPWRDN | DEVCONF2_OTGPWRDN |
46 DEVCONF2_OTGMODE | DEVCONF2_REFFREQ |
47 DEVCONF2_PHY_GPIOMODE);
48 devconf2 |= DEVCONF2_SESENDEN | DEVCONF2_VBDTCTEN | DEVCONF2_PHY_PLLON |
49 DEVCONF2_REFFREQ_13MHZ | DEVCONF2_DATPOL;
51 writel(devconf2, &am35x_scm_general_regs->devconf2);
53 /* wait until the USB phy is turned on */
54 timeout = musb_cfg.timeout;
56 if (readl(&am35x_scm_general_regs->devconf2) & DEVCONF2_PHYCKGD)
59 /* USB phy was not turned on */
66 static void phy_off(void)
71 * Power down the on-chip PHY.
73 devconf2 = readl(&am35x_scm_general_regs->devconf2);
75 devconf2 &= ~DEVCONF2_PHY_PLLON;
76 devconf2 |= DEVCONF2_PHYPWRDN | DEVCONF2_OTGPWRDN;
77 writel(devconf2, &am35x_scm_general_regs->devconf2);
81 * This function performs platform specific initialization for usb0.
83 int musb_platform_init(void)
88 /* global usb reset */
89 sw_reset = readl(&am35x_scm_general_regs->ip_sw_reset);
91 writel(sw_reset, &am35x_scm_general_regs->ip_sw_reset);
92 sw_reset &= ~(1 << 0);
93 writel(sw_reset, &am35x_scm_general_regs->ip_sw_reset);
95 /* reset the controller */
96 writel(0x1, &am35x_usb_regs->control);
99 /* start the on-chip usb phy and its pll */
103 /* Returns zero if e.g. not clocked */
104 revision = readl(&am35x_usb_regs->revision);
112 * This function performs platform specific deinitialization for usb0.
114 void musb_platform_deinit(void)
116 /* Turn off the phy */
121 * This function reads data from endpoint fifo for AM35x
122 * which supports only 32bit read operation.
124 * ep - endpoint number
125 * length - number of bytes to read from FIFO
126 * fifo_data - pointer to data buffer into which data is read
128 __attribute__((weak))
129 void read_fifo(u8 ep, u32 length, void *fifo_data)
131 u8 *data = (u8 *)fifo_data;
135 /* select the endpoint index */
136 writeb(ep, &musbr->index);
139 for (i = 0; i < (length >> 2); i++) {
140 val = readl(&musbr->fifox[ep]);
141 memcpy(data, &val, 4);
147 val = readl(&musbr->fifox[ep]);
148 memcpy(data, &val, length);