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3b81a68094
DMA engine of some old SDIO host controllers require block size alignment for data length of each scatterlist item. This patch introduces an intermediate buffer list to support this kind of platform. It decreases the throughput because of an extra memcpy in critical data path. So don't turn this on unless it's necessary. Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com> Reviewed-by: Arend van Spriel <arend@broadcom.com> Signed-off-by: Franky Lin <frankyl@broadcom.com> Signed-off-by: Arend van Spriel <arend@broadcom.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
129 lines
4.9 KiB
C
129 lines
4.9 KiB
C
/*
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* Copyright (c) 2013 Broadcom Corporation
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef _LINUX_BRCMFMAC_PLATFORM_H
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#define _LINUX_BRCMFMAC_PLATFORM_H
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/*
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* Platform specific driver functions and data. Through the platform specific
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* device data functions can be provided to help the brcmfmac driver to
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* operate with the device in combination with the used platform.
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*
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* Use the platform data in the following (similar) way:
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*
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*
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#include <brcmfmac_platform.h>
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static void brcmfmac_power_on(void)
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{
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}
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static void brcmfmac_power_off(void)
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{
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}
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static void brcmfmac_reset(void)
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{
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}
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static struct brcmfmac_sdio_platform_data brcmfmac_sdio_pdata = {
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.power_on = brcmfmac_power_on,
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.power_off = brcmfmac_power_off,
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.reset = brcmfmac_reset
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};
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static struct platform_device brcmfmac_device = {
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.name = BRCMFMAC_SDIO_PDATA_NAME,
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.id = PLATFORM_DEVID_NONE,
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.dev.platform_data = &brcmfmac_sdio_pdata
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};
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void __init brcmfmac_init_pdata(void)
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{
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brcmfmac_sdio_pdata.oob_irq_supported = true;
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brcmfmac_sdio_pdata.oob_irq_nr = gpio_to_irq(GPIO_BRCMF_SDIO_OOB);
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brcmfmac_sdio_pdata.oob_irq_flags = IORESOURCE_IRQ |
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IORESOURCE_IRQ_HIGHLEVEL;
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platform_device_register(&brcmfmac_device);
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}
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*
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*
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* Note: the brcmfmac can be loaded as module or be statically built-in into
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* the kernel. If built-in then do note that it uses module_init (and
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* module_exit) routines which equal device_initcall. So if you intend to
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* create a module with the platform specific data for the brcmfmac and have
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* it built-in to the kernel then use a higher initcall then device_initcall
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* (see init.h). If this is not done then brcmfmac will load without problems
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* but will not pickup the platform data.
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*
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* When the driver does not "detect" platform driver data then it will continue
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* without reporting anything and just assume there is no data needed. Which is
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* probably true for most platforms.
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*
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* Explanation of the platform_data fields:
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*
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* drive_strength: is the preferred drive_strength to be used for the SDIO
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* pins. If 0 then a default value will be used. This is the target drive
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* strength, the exact drive strength which will be used depends on the
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* capabilities of the device.
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*
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* oob_irq_supported: does the board have support for OOB interrupts. SDIO
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* in-band interrupts are relatively slow and for having less overhead on
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* interrupt processing an out of band interrupt can be used. If the HW
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* supports this then enable this by setting this field to true and configure
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* the oob related fields.
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*
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* oob_irq_nr, oob_irq_flags: the OOB interrupt information. The values are
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* used for registering the irq using request_irq function.
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*
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* broken_sg_support: flag for broken sg list support of SDIO host controller.
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* Set this to true if the SDIO host controller has higher align requirement
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* than 32 bytes for each scatterlist item.
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*
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* power_on: This function is called by the brcmfmac when the module gets
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* loaded. This can be particularly useful for low power devices. The platform
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* spcific routine may for example decide to power up the complete device.
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* If there is no use-case for this function then provide NULL.
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*
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* power_off: This function is called by the brcmfmac when the module gets
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* unloaded. At this point the device can be powered down or otherwise be reset.
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* So if an actual power_off is not supported but reset is then reset the device
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* when this function gets called. This can be particularly useful for low power
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* devices. If there is no use-case for this function (either power-down or
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* reset) then provide NULL.
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*
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* reset: This function can get called if the device communication broke down.
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* This functionality is particularly useful in case of SDIO type devices. It is
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* possible to reset a dongle via sdio data interface, but it requires that
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* this is fully functional. This function is chip/module specific and this
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* function should return only after the complete reset has completed.
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*/
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#define BRCMFMAC_SDIO_PDATA_NAME "brcmfmac_sdio"
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struct brcmfmac_sdio_platform_data {
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unsigned int drive_strength;
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bool oob_irq_supported;
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unsigned int oob_irq_nr;
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unsigned long oob_irq_flags;
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bool broken_sg_support;
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void (*power_on)(void);
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void (*power_off)(void);
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void (*reset)(void);
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};
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#endif /* _LINUX_BRCMFMAC_PLATFORM_H */
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