b74b94d2a1
We use to handle each message separately in i2c_transfer but that cannot work with message with NOSTOP as it confuses the controller that we disable the interrupts and start a new message. Handle every message in the interrupt handler and fire a new start condition if the previous message have NOSTOP, the controller understand this as a repeated start. This fixes booting on Allwinner A10/A20 platform where before the i2c controller used to write 0 to the PMIC register that control the regulators as it though that this was the continuation of the write message. Tested on: A20 BananaPi, Cubieboard 1 (kevans) Reported by: kevans MFC after: 1 month
88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
/*-
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* Copyright (C) 2008 MARVELL INTERNATIONAL LTD.
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* All rights reserved.
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*
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* Developed by Semihalf.
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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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* 3. Neither the name of MARVELL nor the names of contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY 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 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 _TWSI_H_
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#define _TWSI_H_
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#ifdef EXT_RESOURCES
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#include <dev/extres/clk/clk.h>
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#endif
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struct twsi_baud_rate {
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uint32_t raw;
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int param;
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int m;
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int n;
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};
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struct twsi_softc {
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device_t dev;
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struct resource *res[2];
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struct mtx mutex;
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device_t iicbus;
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#ifdef EXT_RESOURCES
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clk_t clk_core;
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clk_t clk_reg;
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#endif
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void * intrhand;
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bool have_intr;
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struct iic_msg *msgs;
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uint32_t nmsgs;
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uint32_t msg_idx;
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uint16_t sent_bytes;
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uint16_t recv_bytes;
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int transfer;
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int error;
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uint32_t control_val;
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bool need_ack;
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bus_size_t reg_data;
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bus_size_t reg_slave_addr;
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bus_size_t reg_slave_ext_addr;
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bus_size_t reg_control;
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bus_size_t reg_status;
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bus_size_t reg_baud_rate;
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bus_size_t reg_soft_reset;
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struct twsi_baud_rate baud_rate[IIC_FASTEST + 1];
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};
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DECLARE_CLASS(twsi_driver);
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#define TWSI_BAUD_RATE_PARAM(M,N) ((((M) << 3) | ((N) & 0x7)) & 0x7f)
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int twsi_attach(device_t);
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int twsi_detach(device_t);
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#endif /* _TWSI_H_ */
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