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5adcec04b5
Required for Apple and Microsoft -compatible HID-over-SPI drivers.
Most logic was already implemented in commit 3c08673438
"spibus: extend API: add cs_delay ivar, KEEP_CS and NO_SLEEP flags".
It dissallowed driver sleeps in the interrupt context. This commit
extends this feature to handle ddb/kdb context with following:
- Skip driver locking if SPI functions were called from kdb/ddb.
- Reinitialize controller if kdb/ddb initiated SPI transfer has
interrupted another already running one. Does not work very
reliable yet.
Reviewed by: manu
Differential Revision: https://reviews.freebsd.org/D41247
71 lines
2.4 KiB
C
71 lines
2.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2016 Oleksandr Tymoshenko <gonzo@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _DEV_INTEL_SPI_H_
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#define _DEV_INTEL_SPI_H_
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#include <contrib/dev/acpica/include/acpi.h>
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#include <contrib/dev/acpica/include/accommon.h>
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#include <dev/acpica/acpivar.h>
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enum intelspi_vers {
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SPI_BAYTRAIL,
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SPI_BRASWELL,
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SPI_LYNXPOINT,
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SPI_SUNRISEPOINT,
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};
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struct intelspi_softc {
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ACPI_HANDLE sc_handle;
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device_t sc_dev;
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enum intelspi_vers sc_vers;
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struct mtx sc_mtx;
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int sc_mem_rid;
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struct resource *sc_mem_res;
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int sc_irq_rid;
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struct resource *sc_irq_res;
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void *sc_irq_ih;
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struct spi_command *sc_cmd;
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uint32_t sc_len;
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uint32_t sc_read;
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volatile uint32_t sc_flags;
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uint32_t sc_written;
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uint32_t sc_clock;
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uint32_t sc_mode;
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/* LPSS private register storage for suspend-resume */
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uint32_t sc_regs[9];
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};
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int intelspi_attach(device_t dev);
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int intelspi_detach(device_t dev);
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int intelspi_transfer(device_t dev, device_t child, struct spi_command *cmd);
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int intelspi_suspend(device_t dev);
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int intelspi_resume(device_t dev);
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#endif
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