d27ba30884
The Qualcomm Universal Peripherals Engine (QUP) is a unified SPI and I2C peripheral that ships with a variety of Qualcomm SoCs. It supports three transfer modes - single PIO, block PIO and DMA. This driver only supports the single PIO mode, which is enough to bootstrap the rest of the SPI NAND/NOR support and means I can do things like read the Wifi calibration data from NOR. It has some hardware support code for the other transfer modes as well as some support for split transfers (ie, transfers with no read or write phase), but I haven't yet implemented those. This driver is based on four sources - the linux driver, the u-boot driver, some initial work done for APQ8064 by mmel@, and the APQ8064 Technical Reference Manual which is surprisingly free and open to read. The linux and u-boot drivers approach a variety of things completely differently, from how PIO is done, the hardware support for re-ordering bytes in a transfer word and how the CS lines are used. Tested: * IPQ4018, SPI to NAND/NOR flash, PIO only
50 lines
2.0 KiB
C
50 lines
2.0 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2021 Adrian Chadd <adrian@FreeBSD.org>
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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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* $FreeBSD$
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*/
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#ifndef __QCOM_SPI_DEBUG_H__
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#define __QCOM_SPI_DEBUG_H__
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#define QCOM_SPI_DEBUG_TRANSFER 0x00000001
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#define QCOM_SPI_DEBUG_HW_TRANSFER_SETUP 0x00000002
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#define QCOM_SPI_DEBUG_HW_TX_FIFO 0x00000004
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#define QCOM_SPI_DEBUG_HW_RX_FIFO 0x00000008
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#define QCOM_SPI_DEBUG_INTR 0x00000010
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#define QCOM_SPI_DEBUG_CHIPSELECT 0x00000020
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#define QCOM_SPI_DEBUG_HW_CHIPSELECT 0x00000080
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#define QCOM_SPI_DEBUG_HW_STATE_CHANGE 0x00000100
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#define QCOM_SPI_DEBUG_HW_INTR 0x00000200
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#define QCOM_SPI_DPRINTF(sc, flags, ...) \
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do { \
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if ((sc)->sc_debug & flags) \
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device_printf((sc)->sc_dev, __VA_ARGS__); \
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} while (0)
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#endif /* __QCOM_SPI_DEBUG_H__ */
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