include/linux/platform_data/brcmfmac-sdio.h

   1 /*
   2  * Copyright (c) 2013 Broadcom Corporation
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  11  * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
  13  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  14  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #ifndef _LINUX_BRCMFMAC_PLATFORM_H
  18 #define _LINUX_BRCMFMAC_PLATFORM_H
  19
  20 /*
  21  * Platform specific driver functions and data. Through the platform specific
  22  * device data functions can be provided to help the brcmfmac driver to
  23  * operate with the device in combination with the used platform.
  24  *
  25  * Use the platform data in the following (similar) way:
  26  *
  27  *
  28 #include <brcmfmac_platform.h>
  29
  30
  31 static void brcmfmac_power_on(void)
  32 {
  33 }
  34
  35 static void brcmfmac_power_off(void)
  36 {
  37 }
  38
  39 static void brcmfmac_reset(void)
  40 {
  41 }
  42
  43 static struct brcmfmac_sdio_platform_data brcmfmac_sdio_pdata = {
  44         .power_on               = brcmfmac_power_on,
  45         .power_off              = brcmfmac_power_off,
  46         .reset                  = brcmfmac_reset
  47 };
  48
  49 static struct platform_device brcmfmac_device = {
  50         .name                   = BRCMFMAC_SDIO_PDATA_NAME,
  51         .id                     = PLATFORM_DEVID_NONE,
  52         .dev.platform_data      = &brcmfmac_sdio_pdata
  53 };
  54
  55 void __init brcmfmac_init_pdata(void)
  56 {
  57         brcmfmac_sdio_pdata.oob_irq_supported = true;
  58         brcmfmac_sdio_pdata.oob_irq_nr = gpio_to_irq(GPIO_BRCMF_SDIO_OOB);
  59         brcmfmac_sdio_pdata.oob_irq_flags = IORESOURCE_IRQ |
  60                                             IORESOURCE_IRQ_HIGHLEVEL;
  61         platform_device_register(&brcmfmac_device);
  62 }
  63  *
  64  *
  65  * Note: the brcmfmac can be loaded as module or be statically built-in into
  66  * the kernel. If built-in then do note that it uses module_init (and
  67  * module_exit) routines which equal device_initcall. So if you intend to
  68  * create a module with the platform specific data for the brcmfmac and have
  69  * it built-in to the kernel then use a higher initcall then device_initcall
  70  * (see init.h). If this is not done then brcmfmac will load without problems
  71  * but will not pickup the platform data.
  72  *
  73  * When the driver does not "detect" platform driver data then it will continue
  74  * without reporting anything and just assume there is no data needed. Which is
  75  * probably true for most platforms.
  76  *
  77  * Explanation of the platform_data fields:
  78  *
  79  * drive_strength: is the preferred drive_strength to be used for the SDIO
  80  * pins. If 0 then a default value will be used. This is the target drive
  81  * strength, the exact drive strength which will be used depends on the
  82  * capabilities of the device.
  83  *
  84  * oob_irq_supported: does the board have support for OOB interrupts. SDIO
  85  * in-band interrupts are relatively slow and for having less overhead on
  86  * interrupt processing an out of band interrupt can be used. If the HW
  87  * supports this then enable this by setting this field to true and configure
  88  * the oob related fields.
  89  *
  90  * oob_irq_nr, oob_irq_flags: the OOB interrupt information. The values are
  91  * used for registering the irq using request_irq function.
  92  *
  93  * power_on: This function is called by the brcmfmac when the module gets
  94  * loaded. This can be particularly useful for low power devices. The platform
  95  * spcific routine may for example decide to power up the complete device.
  96  * If there is no use-case for this function then provide NULL.
  97  *
  98  * power_off: This function is called by the brcmfmac when the module gets
  99  * unloaded. At this point the device can be powered down or otherwise be reset.
 100  * So if an actual power_off is not supported but reset is then reset the device
 101  * when this function gets called. This can be particularly useful for low power
 102  * devices. If there is no use-case for this function (either power-down or
 103  * reset) then provide NULL.
 104  *
 105  * reset: This function can get called if the device communication broke down.
 106  * This functionality is particularly useful in case of SDIO type devices. It is
 107  * possible to reset a dongle via sdio data interface, but it requires that
 108  * this is fully functional. This function is chip/module specific and this
 109  * function should return only after the complete reset has completed.
 110  */
 111
 112 #define BRCMFMAC_SDIO_PDATA_NAME        "brcmfmac_sdio"
 113
 114 struct brcmfmac_sdio_platform_data {
 115         unsigned int drive_strength;
 116         bool oob_irq_supported;
 117         unsigned int oob_irq_nr;
 118         unsigned long oob_irq_flags;
 119         void (*power_on)(void);
 120         void (*power_off)(void);
 121         void (*reset)(void);
 122 };
 123
 124 #endif /* _LINUX_BRCMFMAC_PLATFORM_H */