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usb-fs.c

/*
 * Platform level USB initialization for FS USB OTG controller on omap1 and 24xx
 *
 * 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
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/err.h>

#include <asm/irq.h>

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

#include "control.h"
#include "mux.h"

#define INT_USB_IRQ_GEN       INT_24XX_USB_IRQ_GEN
#define INT_USB_IRQ_NISO      INT_24XX_USB_IRQ_NISO
#define INT_USB_IRQ_ISO       INT_24XX_USB_IRQ_ISO
#define INT_USB_IRQ_HGEN      INT_24XX_USB_IRQ_HGEN
#define INT_USB_IRQ_OTG       INT_24XX_USB_IRQ_OTG

#if defined(CONFIG_ARCH_OMAP2)

#ifdef      CONFIG_USB_GADGET_OMAP

static struct resource udc_resources[] = {
      /* order is significant! */
      {           /* registers */
            .start            = UDC_BASE,
            .end        = UDC_BASE + 0xff,
            .flags            = IORESOURCE_MEM,
      }, {        /* general IRQ */
            .start            = INT_USB_IRQ_GEN,
            .flags            = IORESOURCE_IRQ,
      }, {        /* PIO IRQ */
            .start            = INT_USB_IRQ_NISO,
            .flags            = IORESOURCE_IRQ,
      }, {        /* SOF IRQ */
            .start            = INT_USB_IRQ_ISO,
            .flags            = IORESOURCE_IRQ,
      },
};

static u64 udc_dmamask = ~(u32)0;

static struct platform_device udc_device = {
      .name       = "omap_udc",
      .id         = -1,
      .dev = {
            .dma_mask         = &udc_dmamask,
            .coherent_dma_mask      = 0xffffffff,
      },
      .num_resources    = ARRAY_SIZE(udc_resources),
      .resource   = udc_resources,
};

static inline void udc_device_init(struct omap_usb_config *pdata)
{
      pdata->udc_device = &udc_device;
}

#else

static inline void udc_device_init(struct omap_usb_config *pdata)
{
}

#endif

#if   defined(CONFIG_USB_OHCI_HCD) || defined(CONFIG_USB_OHCI_HCD_MODULE)

/* The dmamask must be set for OHCI to work */
static u64 ohci_dmamask = ~(u32)0;

static struct resource ohci_resources[] = {
      {
            .start      = OMAP_OHCI_BASE,
            .end  = OMAP_OHCI_BASE + 0xff,
            .flags      = IORESOURCE_MEM,
      },
      {
            .start      = INT_USB_IRQ_HGEN,
            .flags      = IORESOURCE_IRQ,
      },
};

static struct platform_device ohci_device = {
      .name             = "ohci",
      .id               = -1,
      .dev = {
            .dma_mask         = &ohci_dmamask,
            .coherent_dma_mask      = 0xffffffff,
      },
      .num_resources    = ARRAY_SIZE(ohci_resources),
      .resource         = ohci_resources,
};

static inline void ohci_device_init(struct omap_usb_config *pdata)
{
      pdata->ohci_device = &ohci_device;
}

#else

static inline void ohci_device_init(struct omap_usb_config *pdata)
{
}

#endif

#if   defined(CONFIG_USB_OTG) && defined(CONFIG_ARCH_OMAP_OTG)

static struct resource otg_resources[] = {
      /* order is significant! */
      {
            .start            = OTG_BASE,
            .end        = OTG_BASE + 0xff,
            .flags            = IORESOURCE_MEM,
      }, {
            .start            = INT_USB_IRQ_OTG,
            .flags            = IORESOURCE_IRQ,
      },
};

static struct platform_device otg_device = {
      .name       = "omap_otg",
      .id         = -1,
      .num_resources    = ARRAY_SIZE(otg_resources),
      .resource   = otg_resources,
};

static inline void otg_device_init(struct omap_usb_config *pdata)
{
      pdata->otg_device = &otg_device;
}

#else

static inline void otg_device_init(struct omap_usb_config *pdata)
{
}

#endif

static void omap2_usb_devconf_clear(u8 port, u32 mask)
{
      u32 r;

      r = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
      r &= ~USBTXWRMODEI(port, mask);
      omap_ctrl_writel(r, OMAP2_CONTROL_DEVCONF0);
}

static void omap2_usb_devconf_set(u8 port, u32 mask)
{
      u32 r;

      r = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
      r |= USBTXWRMODEI(port, mask);
      omap_ctrl_writel(r, OMAP2_CONTROL_DEVCONF0);
}

static void omap2_usb2_disable_5pinbitll(void)
{
      u32 r;

      r = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
      r &= ~(USBTXWRMODEI(2, USB_BIDIR_TLL) | USBT2TLL5PI);
      omap_ctrl_writel(r, OMAP2_CONTROL_DEVCONF0);
}

static void omap2_usb2_enable_5pinunitll(void)
{
      u32 r;

      r = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
      r |= USBTXWRMODEI(2, USB_UNIDIR_TLL) | USBT2TLL5PI;
      omap_ctrl_writel(r, OMAP2_CONTROL_DEVCONF0);
}

static u32 __init omap2_usb0_init(unsigned nwires, unsigned is_device)
{
      u32   syscon1 = 0;

      omap2_usb_devconf_clear(0, USB_BIDIR_TLL);

      if (nwires == 0)
            return 0;

      if (is_device)
            omap_mux_init_signal("usb0_puen", 0);

      omap_mux_init_signal("usb0_dat", 0);
      omap_mux_init_signal("usb0_txen", 0);
      omap_mux_init_signal("usb0_se0", 0);
      if (nwires != 3)
            omap_mux_init_signal("usb0_rcv", 0);

      switch (nwires) {
      case 3:
            syscon1 = 2;
            omap2_usb_devconf_set(0, USB_BIDIR);
            break;
      case 4:
            syscon1 = 1;
            omap2_usb_devconf_set(0, USB_BIDIR);
            break;
      case 6:
            syscon1 = 3;
            omap_mux_init_signal("usb0_vp", 0);
            omap_mux_init_signal("usb0_vm", 0);
            omap2_usb_devconf_set(0, USB_UNIDIR);
            break;
      default:
            printk(KERN_ERR "illegal usb%d %d-wire transceiver\n",
                  0, nwires);
      }

      return syscon1 << 16;
}

static u32 __init omap2_usb1_init(unsigned nwires)
{
      u32   syscon1 = 0;

      omap2_usb_devconf_clear(1, USB_BIDIR_TLL);

      if (nwires == 0)
            return 0;

      /* NOTE:  board-specific code must set up pin muxing for usb1,
       * since each signal could come out on either of two balls.
       */

      switch (nwires) {
      case 2:
            /* NOTE: board-specific code must override this setting if
             * this TLL link is not using DP/DM
             */
            syscon1 = 1;
            omap2_usb_devconf_set(1, USB_BIDIR_TLL);
            break;
      case 3:
            syscon1 = 2;
            omap2_usb_devconf_set(1, USB_BIDIR);
            break;
      case 4:
            syscon1 = 1;
            omap2_usb_devconf_set(1, USB_BIDIR);
            break;
      case 6:
      default:
            printk(KERN_ERR "illegal usb%d %d-wire transceiver\n",
                  1, nwires);
      }

      return syscon1 << 20;
}

static u32 __init omap2_usb2_init(unsigned nwires, unsigned alt_pingroup)
{
      u32   syscon1 = 0;

      omap2_usb2_disable_5pinbitll();
      alt_pingroup = 0;

      /* NOTE omap1 erratum: must leave USB2_UNI_R set if usb0 in use */
      if (alt_pingroup || nwires == 0)
            return 0;

      omap_mux_init_signal("usb2_dat", 0);
      omap_mux_init_signal("usb2_se0", 0);
      if (nwires > 2)
            omap_mux_init_signal("usb2_txen", 0);
      if (nwires > 3)
            omap_mux_init_signal("usb2_rcv", 0);

      switch (nwires) {
      case 2:
            /* NOTE: board-specific code must override this setting if
             * this TLL link is not using DP/DM
             */
            syscon1 = 1;
            omap2_usb_devconf_set(2, USB_BIDIR_TLL);
            break;
      case 3:
            syscon1 = 2;
            omap2_usb_devconf_set(2, USB_BIDIR);
            break;
      case 4:
            syscon1 = 1;
            omap2_usb_devconf_set(2, USB_BIDIR);
            break;
      case 5:
            /* NOTE: board-specific code must mux this setting depending
             * on TLL link using DP/DM.  Something must also
             * set up OTG_SYSCON2.HMC_TLL{ATTACH,SPEED}
             * 2420: hdq_sio.usb2_tllse0 or vlynq_rx0.usb2_tllse0
             * 2430: hdq_sio.usb2_tllse0 or sdmmc2_dat0.usb2_tllse0
             */

            syscon1 = 3;
            omap2_usb2_enable_5pinunitll();
            break;
      case 6:
      default:
            printk(KERN_ERR "illegal usb%d %d-wire transceiver\n",
                  2, nwires);
      }

      return syscon1 << 24;
}

void __init omap2_usbfs_init(struct omap_usb_config *pdata)
{
      struct clk *ick;

      if (!cpu_is_omap24xx())
            return;

      ick = clk_get(NULL, "usb_l4_ick");
      if (IS_ERR(ick))
            return;

      clk_enable(ick);
      pdata->usb0_init = omap2_usb0_init;
      pdata->usb1_init = omap2_usb1_init;
      pdata->usb2_init = omap2_usb2_init;
      udc_device_init(pdata);
      ohci_device_init(pdata);
      otg_device_init(pdata);
      omap_otg_init(pdata);
      clk_disable(ick);
      clk_put(ick);
}

#endif

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