1 /*
  2 * arch/arm/plat-omap/usb.c -- platform level USB initialization
  3 *
  4 * Copyright (C) 2004 Texas Instruments, Inc.
  5 *
  6 * This program is free software; you can redistribute it and/or modify
  7 * it under the terms of the GNU General Public License as published by
  8 * the Free Software Foundation; either version 2 of the License, or
  9 * (at your option) any later version.
 10 *
 11 * This program is distributed in the hope that it will be useful,
 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14 * GNU General Public License for more details.
 15 *
 16 * You should have received a copy of the GNU General Public License
 17 * along with this program; if not, write to the Free Software
 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 19 */
 20
 21#undef	DEBUG
 22
 23#include <linux/module.h>
 24#include <linux/kernel.h>
 25#include <linux/init.h>
 26#include <linux/platform_device.h>
 27#include <linux/io.h>
 28
 29#include <plat/usb.h>
 30#include <plat/board.h>
 31
 32#include <mach/hardware.h>
 33
 34#ifdef	CONFIG_ARCH_OMAP_OTG
 35
 36void __init
 37omap_otg_init(struct omap_usb_config *config)
 38{
 39	u32		syscon;
 40	int		alt_pingroup = 0;
 41
 42	/* NOTE:  no bus or clock setup (yet?) */
 43
 44	syscon = omap_readl(OTG_SYSCON_1) & 0xffff;
 45	if (!(syscon & OTG_RESET_DONE))
 46		pr_debug("USB resets not complete?\n");
 47
 48	//omap_writew(0, OTG_IRQ_EN);
 49
 50	/* pin muxing and transceiver pinouts */
 51	if (config->pins[0] > 2)	/* alt pingroup 2 */
 52		alt_pingroup = 1;
 53	syscon |= config->usb0_init(config->pins[0], is_usb0_device(config));
 54	syscon |= config->usb1_init(config->pins[1]);
 55	syscon |= config->usb2_init(config->pins[2], alt_pingroup);
 56	pr_debug("OTG_SYSCON_1 = %08x\n", omap_readl(OTG_SYSCON_1));
 57	omap_writel(syscon, OTG_SYSCON_1);
 58
 59	syscon = config->hmc_mode;
 60	syscon |= USBX_SYNCHRO | (4 << 16) /* B_ASE0_BRST */;
 61#ifdef	CONFIG_USB_OTG
 62	if (config->otg)
 63		syscon |= OTG_EN;
 64#endif
 65	if (cpu_class_is_omap1())
 66		pr_debug("USB_TRANSCEIVER_CTRL = %03x\n",
 67			 omap_readl(USB_TRANSCEIVER_CTRL));
 68	pr_debug("OTG_SYSCON_2 = %08x\n", omap_readl(OTG_SYSCON_2));
 69	omap_writel(syscon, OTG_SYSCON_2);
 70
 71	printk("USB: hmc %d", config->hmc_mode);
 72	if (!alt_pingroup)
 73		printk(", usb2 alt %d wires", config->pins[2]);
 74	else if (config->pins[0])
 75		printk(", usb0 %d wires%s", config->pins[0],
 76			is_usb0_device(config) ? " (dev)" : "");
 77	if (config->pins[1])
 78		printk(", usb1 %d wires", config->pins[1]);
 79	if (!alt_pingroup && config->pins[2])
 80		printk(", usb2 %d wires", config->pins[2]);
 81	if (config->otg)
 82		printk(", Mini-AB on usb%d", config->otg - 1);
 83	printk("\n");
 84
 85	if (cpu_class_is_omap1()) {
 86		u16 w;
 87
 88		/* leave USB clocks/controllers off until needed */
 89		w = omap_readw(ULPD_SOFT_REQ);
 90		w &= ~SOFT_USB_CLK_REQ;
 91		omap_writew(w, ULPD_SOFT_REQ);
 92
 93		w = omap_readw(ULPD_CLOCK_CTRL);
 94		w &= ~USB_MCLK_EN;
 95		w |= DIS_USB_PVCI_CLK;
 96		omap_writew(w, ULPD_CLOCK_CTRL);
 97	}
 98	syscon = omap_readl(OTG_SYSCON_1);
 99	syscon |= HST_IDLE_EN|DEV_IDLE_EN|OTG_IDLE_EN;
100
101#ifdef	CONFIG_USB_GADGET_OMAP
102	if (config->otg || config->register_dev) {
103		struct platform_device *udc_device = config->udc_device;
104		int status;
105
106		syscon &= ~DEV_IDLE_EN;
107		udc_device->dev.platform_data = config;
108		status = platform_device_register(udc_device);
109		if (status)
110			pr_debug("can't register UDC device, %d\n", status);
111	}
112#endif
113
114#if	defined(CONFIG_USB_OHCI_HCD) || defined(CONFIG_USB_OHCI_HCD_MODULE)
115	if (config->otg || config->register_host) {
116		struct platform_device *ohci_device = config->ohci_device;
117		int status;
118
119		syscon &= ~HST_IDLE_EN;
120		ohci_device->dev.platform_data = config;
121		status = platform_device_register(ohci_device);
122		if (status)
123			pr_debug("can't register OHCI device, %d\n", status);
124	}
125#endif
126
127#ifdef	CONFIG_USB_OTG
128	if (config->otg) {
129		struct platform_device *otg_device = config->otg_device;
130		int status;
131
132		syscon &= ~OTG_IDLE_EN;
133		otg_device->dev.platform_data = config;
134		status = platform_device_register(otg_device);
135		if (status)
136			pr_debug("can't register OTG device, %d\n", status);
137	}
138#endif
139	pr_debug("OTG_SYSCON_1 = %08x\n", omap_readl(OTG_SYSCON_1));
140	omap_writel(syscon, OTG_SYSCON_1);
141}
142
143#else
144void omap_otg_init(struct omap_usb_config *config) {}
145#endif