arch/arm/mach-omap2/usb-musb.c

   1 /*
   2  * linux/arch/arm/mach-omap2/usb-musb.c
   3  *
   4  * This file will contain the board specific details for the
   5  * MENTOR USB OTG controller on OMAP3430
   6  *
   7  * Copyright (C) 2007-2008 Texas Instruments
   8  * Copyright (C) 2008 Nokia Corporation
   9  * Author: Vikram Pandita
  10  *
  11  * Generalization by:
  12  * Felipe Balbi <felipe.balbi@nokia.com>
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License version 2 as
  16  * published by the Free Software Foundation.
  17  */
  18
  19 #include <linux/types.h>
  20 #include <linux/errno.h>
  21 #include <linux/delay.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/clk.h>
  24 #include <linux/dma-mapping.h>
  25 #include <linux/io.h>
  26 #include <linux/usb/musb.h>
  27
  28 #include <plat/usb.h>
  29 #include "omap_device.h"
  30
  31 #include "soc.h"
  32 #include "mux.h"
  33
  34 static struct musb_hdrc_config musb_config = {
  35         .multipoint     = 1,
  36         .dyn_fifo       = 1,
  37         .num_eps        = 16,
  38         .ram_bits       = 12,
  39 };
  40
  41 static struct musb_hdrc_platform_data musb_plat = {
  42 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
  43         .mode           = MUSB_OTG,
  44 #else
  45         .mode           = MUSB_HOST,
  46 #endif
  47         /* .clock is set dynamically */
  48         .config         = &musb_config,
  49
  50         /* REVISIT charge pump on TWL4030 can supply up to
  51          * 100 mA ... but this value is board-specific, like
  52          * "mode", and should be passed to usb_musb_init().
  53          */
  54         .power          = 50,                   /* up to 100 mA */
  55 };
  56
  57 static u64 musb_dmamask = DMA_BIT_MASK(32);
  58
  59 static struct omap_musb_board_data musb_default_board_data = {
  60         .interface_type         = MUSB_INTERFACE_ULPI,
  61         .mode                   = MUSB_OTG,
  62         .power                  = 100,
  63 };
  64
  65 void __init usb_musb_init(struct omap_musb_board_data *musb_board_data)
  66 {
  67         struct omap_hwmod               *oh;
  68         struct platform_device          *pdev;
  69         struct device                   *dev;
  70         int                             bus_id = -1;
  71         const char                      *oh_name, *name;
  72         struct omap_musb_board_data     *board_data;
  73
  74         if (musb_board_data)
  75                 board_data = musb_board_data;
  76         else
  77                 board_data = &musb_default_board_data;
  78
  79         /*
  80          * REVISIT: This line can be removed once all the platforms using
  81          * musb_core.c have been converted to use use clkdev.
  82          */
  83         musb_plat.clock = "ick";
  84         musb_plat.board_data = board_data;
  85         musb_plat.power = board_data->power >> 1;
  86         musb_plat.mode = board_data->mode;
  87         musb_plat.extvbus = board_data->extvbus;
  88
  89         if (soc_is_am35xx()) {
  90                 oh_name = "am35x_otg_hs";
  91                 name = "musb-am35x";
  92         } else if (cpu_is_ti81xx()) {
  93                 oh_name = "usb_otg_hs";
  94                 name = "musb-ti81xx";
  95         } else {
  96                 oh_name = "usb_otg_hs";
  97                 name = "musb-omap2430";
  98         }
  99
 100         oh = omap_hwmod_lookup(oh_name);
 101         if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
 102                  __func__, oh_name))
 103                 return;
 104
 105         pdev = omap_device_build(name, bus_id, oh, &musb_plat,
 106                                sizeof(musb_plat), NULL, 0, false);
 107         if (IS_ERR(pdev)) {
 108                 pr_err("Could not build omap_device for %s %s\n",
 109                                                 name, oh_name);
 110                 return;
 111         }
 112
 113         dev = &pdev->dev;
 114         get_device(dev);
 115         dev->dma_mask = &musb_dmamask;
 116         dev->coherent_dma_mask = musb_dmamask;
 117         put_device(dev);
 118 }