LXR linux/arch/arm/plat-omap/usb.c

   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#ifdef  CONFIG_ARCH_OMAP_OTG
  33
  34void __init
  35omap_otg_init(struct omap_usb_config *config)
  36{
  37        u32             syscon;
  38        int             status;
  39        int             alt_pingroup = 0;
  40
  41        /* NOTE:  no bus or clock setup (yet?) */
  42
  43        syscon = omap_readl(OTG_SYSCON_1) & 0xffff;
  44        if (!(syscon & OTG_RESET_DONE))
  45                pr_debug("USB resets not complete?\n");
  46
  47        //omap_writew(0, OTG_IRQ_EN);
  48
  49        /* pin muxing and transceiver pinouts */
  50        if (config->pins[0] > 2)        /* alt pingroup 2 */
  51                alt_pingroup = 1;
  52        syscon |= config->usb0_init(config->pins[0], is_usb0_device(config));
  53        syscon |= config->usb1_init(config->pins[1]);
  54        syscon |= config->usb2_init(config->pins[2], alt_pingroup);
  55        pr_debug("OTG_SYSCON_1 = %08x\n", omap_readl(OTG_SYSCON_1));
  56        omap_writel(syscon, OTG_SYSCON_1);
  57
  58        syscon = config->hmc_mode;
  59        syscon |= USBX_SYNCHRO | (4 << 16) /* B_ASE0_BRST */;
  60#ifdef  CONFIG_USB_OTG
  61        if (config->otg)
  62                syscon |= OTG_EN;
  63#endif
  64        if (cpu_class_is_omap1())
  65                pr_debug("USB_TRANSCEIVER_CTRL = %03x\n",
  66                         omap_readl(USB_TRANSCEIVER_CTRL));
  67        pr_debug("OTG_SYSCON_2 = %08x\n", omap_readl(OTG_SYSCON_2));
  68        omap_writel(syscon, OTG_SYSCON_2);
  69
  70        printk("USB: hmc %d", config->hmc_mode);
  71        if (!alt_pingroup)
  72                printk(", usb2 alt %d wires", config->pins[2]);
  73        else if (config->pins[0])
  74                printk(", usb0 %d wires%s", config->pins[0],
  75                        is_usb0_device(config) ? " (dev)" : "");
  76        if (config->pins[1])
  77                printk(", usb1 %d wires", config->pins[1]);
  78        if (!alt_pingroup && config->pins[2])
  79                printk(", usb2 %d wires", config->pins[2]);
  80        if (config->otg)
  81                printk(", Mini-AB on usb%d", config->otg - 1);
  82        printk("\n");
  83
  84        if (cpu_class_is_omap1()) {
  85                u16 w;
  86
  87                /* leave USB clocks/controllers off until needed */
  88                w = omap_readw(ULPD_SOFT_REQ);
  89                w &= ~SOFT_USB_CLK_REQ;
  90                omap_writew(w, ULPD_SOFT_REQ);
  91
  92                w = omap_readw(ULPD_CLOCK_CTRL);
  93                w &= ~USB_MCLK_EN;
  94                w |= DIS_USB_PVCI_CLK;
  95                omap_writew(w, ULPD_CLOCK_CTRL);
  96        }
  97        syscon = omap_readl(OTG_SYSCON_1);
  98        syscon |= HST_IDLE_EN|DEV_IDLE_EN|OTG_IDLE_EN;
  99
 100#ifdef  CONFIG_USB_GADGET_OMAP
 101        if (config->otg || config->register_dev) {
 102                struct platform_device *udc_device = config->udc_device;
 103
 104                syscon &= ~DEV_IDLE_EN;
 105                udc_device->dev.platform_data = config;
 106                status = platform_device_register(udc_device);
 107                if (status)
 108                        pr_debug("can't register UDC device, %d\n", status);
 109        }
 110#endif
 111
 112#if     defined(CONFIG_USB_OHCI_HCD) || defined(CONFIG_USB_OHCI_HCD_MODULE)
 113        if (config->otg || config->register_host) {
 114                struct platform_device *ohci_device = config->ohci_device;
 115
 116                syscon &= ~HST_IDLE_EN;
 117                ohci_device->dev.platform_data = config;
 118                status = platform_device_register(ohci_device);
 119                if (status)
 120                        pr_debug("can't register OHCI device, %d\n", status);
 121        }
 122#endif
 123
 124#ifdef  CONFIG_USB_OTG
 125        if (config->otg) {
 126                struct platform_device *otg_device = config->otg_device;
 127
 128                syscon &= ~OTG_IDLE_EN;
 129                otg_device->dev.platform_data = config;
 130                status = platform_device_register(otg_device);
 131                if (status)
 132                        pr_debug("can't register OTG device, %d\n", status);
 133        }
 134#endif
 135        pr_debug("OTG_SYSCON_1 = %08x\n", omap_readl(OTG_SYSCON_1));
 136        omap_writel(syscon, OTG_SYSCON_1);
 137
 138        status = 0;
 139}
 140
 141#else
 142void omap_otg_init(struct omap_usb_config *config) {}
 143#endif
 144