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usb-musb.c
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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 <[email protected]>
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 <plat/omap_device.h>
30 
31 #include "am35xx.h"
32 
33 #include "mux.h"
34 
35 static struct musb_hdrc_config musb_config = {
36  .multipoint = 1,
37  .dyn_fifo = 1,
38  .num_eps = 16,
39  .ram_bits = 12,
40 };
41 
42 static struct musb_hdrc_platform_data musb_plat = {
43 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
44  .mode = MUSB_OTG,
45 #else
46  .mode = MUSB_HOST,
47 #endif
48  /* .clock is set dynamically */
49  .config = &musb_config,
50 
51  /* REVISIT charge pump on TWL4030 can supply up to
52  * 100 mA ... but this value is board-specific, like
53  * "mode", and should be passed to usb_musb_init().
54  */
55  .power = 50, /* up to 100 mA */
56 };
57 
58 static u64 musb_dmamask = DMA_BIT_MASK(32);
59 
60 static struct omap_musb_board_data musb_default_board_data = {
61  .interface_type = MUSB_INTERFACE_ULPI,
62  .mode = MUSB_OTG,
63  .power = 100,
64 };
65 
66 void __init usb_musb_init(struct omap_musb_board_data *musb_board_data)
67 {
68  struct omap_hwmod *oh;
69  struct platform_device *pdev;
70  struct device *dev;
71  int bus_id = -1;
72  const char *oh_name, *name;
73  struct omap_musb_board_data *board_data;
74 
75  if (musb_board_data)
76  board_data = musb_board_data;
77  else
78  board_data = &musb_default_board_data;
79 
80  /*
81  * REVISIT: This line can be removed once all the platforms using
82  * musb_core.c have been converted to use use clkdev.
83  */
84  musb_plat.clock = "ick";
85  musb_plat.board_data = board_data;
86  musb_plat.power = board_data->power >> 1;
87  musb_plat.mode = board_data->mode;
88  musb_plat.extvbus = board_data->extvbus;
89 
90  if (soc_is_am35xx()) {
91  oh_name = "am35x_otg_hs";
92  name = "musb-am35x";
93  } else if (cpu_is_ti81xx()) {
94  oh_name = "usb_otg_hs";
95  name = "musb-ti81xx";
96  } else {
97  oh_name = "usb_otg_hs";
98  name = "musb-omap2430";
99  }
100 
101  oh = omap_hwmod_lookup(oh_name);
102  if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
103  __func__, oh_name))
104  return;
105 
106  pdev = omap_device_build(name, bus_id, oh, &musb_plat,
107  sizeof(musb_plat), NULL, 0, false);
108  if (IS_ERR(pdev)) {
109  pr_err("Could not build omap_device for %s %s\n",
110  name, oh_name);
111  return;
112  }
113 
114  dev = &pdev->dev;
115  get_device(dev);
116  dev->dma_mask = &musb_dmamask;
117  dev->coherent_dma_mask = musb_dmamask;
118  put_device(dev);
119 }