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usb.c

 /*
 * arch/arm/plat-omap/usb.c -- platform level USB initialization
 *
 * Copyright (C) 2004 Texas Instruments, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#undef      DEBUG

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/io.h>

#include <plat/usb.h>
#include <plat/board.h>

#ifdef      CONFIG_ARCH_OMAP_OTG

void __init
omap_otg_init(struct omap_usb_config *config)
{
      u32         syscon;
      int         status;
      int         alt_pingroup = 0;

      /* NOTE:  no bus or clock setup (yet?) */

      syscon = omap_readl(OTG_SYSCON_1) & 0xffff;
      if (!(syscon & OTG_RESET_DONE))
            pr_debug("USB resets not complete?\n");

      //omap_writew(0, OTG_IRQ_EN);

      /* pin muxing and transceiver pinouts */
      if (config->pins[0] > 2)      /* alt pingroup 2 */
            alt_pingroup = 1;
      syscon |= config->usb0_init(config->pins[0], is_usb0_device(config));
      syscon |= config->usb1_init(config->pins[1]);
      syscon |= config->usb2_init(config->pins[2], alt_pingroup);
      pr_debug("OTG_SYSCON_1 = %08x\n", omap_readl(OTG_SYSCON_1));
      omap_writel(syscon, OTG_SYSCON_1);

      syscon = config->hmc_mode;
      syscon |= USBX_SYNCHRO | (4 << 16) /* B_ASE0_BRST */;
#ifdef      CONFIG_USB_OTG
      if (config->otg)
            syscon |= OTG_EN;
#endif
      if (cpu_class_is_omap1())
            pr_debug("USB_TRANSCEIVER_CTRL = %03x\n",
                   omap_readl(USB_TRANSCEIVER_CTRL));
      pr_debug("OTG_SYSCON_2 = %08x\n", omap_readl(OTG_SYSCON_2));
      omap_writel(syscon, OTG_SYSCON_2);

      printk("USB: hmc %d", config->hmc_mode);
      if (!alt_pingroup)
            printk(", usb2 alt %d wires", config->pins[2]);
      else if (config->pins[0])
            printk(", usb0 %d wires%s", config->pins[0],
                  is_usb0_device(config) ? " (dev)" : "");
      if (config->pins[1])
            printk(", usb1 %d wires", config->pins[1]);
      if (!alt_pingroup && config->pins[2])
            printk(", usb2 %d wires", config->pins[2]);
      if (config->otg)
            printk(", Mini-AB on usb%d", config->otg - 1);
      printk("\n");

      if (cpu_class_is_omap1()) {
            u16 w;

            /* leave USB clocks/controllers off until needed */
            w = omap_readw(ULPD_SOFT_REQ);
            w &= ~SOFT_USB_CLK_REQ;
            omap_writew(w, ULPD_SOFT_REQ);

            w = omap_readw(ULPD_CLOCK_CTRL);
            w &= ~USB_MCLK_EN;
            w |= DIS_USB_PVCI_CLK;
            omap_writew(w, ULPD_CLOCK_CTRL);
      }
      syscon = omap_readl(OTG_SYSCON_1);
      syscon |= HST_IDLE_EN|DEV_IDLE_EN|OTG_IDLE_EN;

#ifdef      CONFIG_USB_GADGET_OMAP
      if (config->otg || config->register_dev) {
            struct platform_device *udc_device = config->udc_device;

            syscon &= ~DEV_IDLE_EN;
            udc_device->dev.platform_data = config;
            status = platform_device_register(udc_device);
            if (status)
                  pr_debug("can't register UDC device, %d\n", status);
      }
#endif

#if   defined(CONFIG_USB_OHCI_HCD) || defined(CONFIG_USB_OHCI_HCD_MODULE)
      if (config->otg || config->register_host) {
            struct platform_device *ohci_device = config->ohci_device;

            syscon &= ~HST_IDLE_EN;
            ohci_device->dev.platform_data = config;
            status = platform_device_register(ohci_device);
            if (status)
                  pr_debug("can't register OHCI device, %d\n", status);
      }
#endif

#ifdef      CONFIG_USB_OTG
      if (config->otg) {
            struct platform_device *otg_device = config->otg_device;

            syscon &= ~OTG_IDLE_EN;
            otg_device->dev.platform_data = config;
            status = platform_device_register(otg_device);
            if (status)
                  pr_debug("can't register OTG device, %d\n", status);
      }
#endif
      pr_debug("OTG_SYSCON_1 = %08x\n", omap_readl(OTG_SYSCON_1));
      omap_writel(syscon, OTG_SYSCON_1);

      status = 0;
}

#else
void omap_otg_init(struct omap_usb_config *config) {}
#endif

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